Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

76 files changed, 23448 insertions, 0 deletions

diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
new file mode 100644
index 000000000000..46d4cb1c06f0
--- /dev/null
+++ b/net/ipv4/netfilter/Kconfig
@@ -0,0 +1,696 @@
+#
+# IP netfilter configuration
+#
+
+menu "IP: Netfilter Configuration"
+	depends on INET && NETFILTER
+
+# connection tracking, helpers and protocols
+config IP_NF_CONNTRACK
+	tristate "Connection tracking (required for masq/NAT)"
+	---help---
+	  Connection tracking keeps a record of what packets have passed
+	  through your machine, in order to figure out how they are related
+	  into connections.
+
+	  This is required to do Masquerading or other kinds of Network
+	  Address Translation (except for Fast NAT).  It can also be used to
+	  enhance packet filtering (see `Connection state match support'
+	  below).
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_CT_ACCT
+	bool "Connection tracking flow accounting"
+	depends on IP_NF_CONNTRACK
+	help
+	  If this option is enabled, the connection tracking code will
+	  keep per-flow packet and byte counters.
+
+	  Those counters can be used for flow-based accounting or the
+	  `connbytes' match.
+
+	  If unsure, say `N'.
+
+config IP_NF_CONNTRACK_MARK
+	bool  'Connection mark tracking support'
+	help
+	  This option enables support for connection marks, used by the
+	  `CONNMARK' target and `connmark' match. Similar to the mark value
+	  of packets, but this mark value is kept in the conntrack session
+	  instead of the individual packets.
+	
+config IP_NF_CT_PROTO_SCTP
+	tristate  'SCTP protocol connection tracking support (EXPERIMENTAL)'
+	depends on IP_NF_CONNTRACK && EXPERIMENTAL
+	help
+	  With this option enabled, the connection tracking code will
+	  be able to do state tracking on SCTP connections.
+
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/modules.txt>.  If unsure, say `N'.
+
+config IP_NF_FTP
+	tristate "FTP protocol support"
+	depends on IP_NF_CONNTRACK
+	help
+	  Tracking FTP connections is problematic: special helpers are
+	  required for tracking them, and doing masquerading and other forms
+	  of Network Address Translation on them.
+
+	  To compile it as a module, choose M here.  If unsure, say Y.
+
+config IP_NF_IRC
+	tristate "IRC protocol support"
+	depends on IP_NF_CONNTRACK
+	---help---
+	  There is a commonly-used extension to IRC called
+	  Direct Client-to-Client Protocol (DCC).  This enables users to send
+	  files to each other, and also chat to each other without the need
+	  of a server.  DCC Sending is used anywhere you send files over IRC,
+	  and DCC Chat is most commonly used by Eggdrop bots.  If you are
+	  using NAT, this extension will enable you to send files and initiate
+	  chats.  Note that you do NOT need this extension to get files or
+	  have others initiate chats, or everything else in IRC.
+
+	  To compile it as a module, choose M here.  If unsure, say Y.
+
+config IP_NF_TFTP
+	tristate "TFTP protocol support"
+	depends on IP_NF_CONNTRACK
+	help
+	  TFTP connection tracking helper, this is required depending
+	  on how restrictive your ruleset is.
+	  If you are using a tftp client behind -j SNAT or -j MASQUERADING
+	  you will need this.
+
+	  To compile it as a module, choose M here.  If unsure, say Y.
+
+config IP_NF_AMANDA
+	tristate "Amanda backup protocol support"
+	depends on IP_NF_CONNTRACK
+	help
+	  If you are running the Amanda backup package <http://www.amanda.org/>
+	  on this machine or machines that will be MASQUERADED through this
+	  machine, then you may want to enable this feature.  This allows the
+	  connection tracking and natting code to allow the sub-channels that
+	  Amanda requires for communication of the backup data, messages and
+	  index.
+
+	  To compile it as a module, choose M here.  If unsure, say Y.
+
+config IP_NF_QUEUE
+	tristate "Userspace queueing via NETLINK"
+	help
+	  Netfilter has the ability to queue packets to user space: the
+	  netlink device can be used to access them using this driver.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_IPTABLES
+	tristate "IP tables support (required for filtering/masq/NAT)"
+	help
+	  iptables is a general, extensible packet identification framework.
+	  The packet filtering and full NAT (masquerading, port forwarding,
+	  etc) subsystems now use this: say `Y' or `M' here if you want to use
+	  either of those.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+# The matches.
+config IP_NF_MATCH_LIMIT
+	tristate "limit match support"
+	depends on IP_NF_IPTABLES
+	help
+	  limit matching allows you to control the rate at which a rule can be
+	  matched: mainly useful in combination with the LOG target ("LOG
+	  target support", below) and to avoid some Denial of Service attacks.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_IPRANGE
+	tristate "IP range match support"
+	depends on IP_NF_IPTABLES
+	help
+	  This option makes possible to match IP addresses against IP address
+	  ranges.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_MAC
+	tristate "MAC address match support"
+	depends on IP_NF_IPTABLES
+	help
+	  MAC matching allows you to match packets based on the source
+	  Ethernet address of the packet.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_PKTTYPE
+	tristate "Packet type match support"
+	depends on IP_NF_IPTABLES
+	help
+         Packet type matching allows you to match a packet by
+         its "class", eg. BROADCAST, MULTICAST, ...
+
+	  Typical usage:
+	  iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_MARK
+	tristate "netfilter MARK match support"
+	depends on IP_NF_IPTABLES
+	help
+	  Netfilter mark matching allows you to match packets based on the
+	  `nfmark' value in the packet.  This can be set by the MARK target
+	  (see below).
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_MULTIPORT
+	tristate "Multiple port match support"
+	depends on IP_NF_IPTABLES
+	help
+	  Multiport matching allows you to match TCP or UDP packets based on
+	  a series of source or destination ports: normally a rule can only
+	  match a single range of ports.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_TOS
+	tristate "TOS match support"
+	depends on IP_NF_IPTABLES
+	help
+	  TOS matching allows you to match packets based on the Type Of
+	  Service fields of the IP packet.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_RECENT
+	tristate "recent match support"
+	depends on IP_NF_IPTABLES
+	help
+	  This match is used for creating one or many lists of recently
+	  used addresses and then matching against that/those list(s).
+
+	  Short options are available by using 'iptables -m recent -h'
+	  Official Website: <http://snowman.net/projects/ipt_recent/>
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_ECN
+	tristate "ECN match support"
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a `ECN' match, which allows you to match against
+	  the IPv4 and TCP header ECN fields.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_DSCP
+	tristate "DSCP match support"
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a `DSCP' match, which allows you to match against
+	  the IPv4 header DSCP field (DSCP codepoint).
+
+	  The DSCP codepoint can have any value between 0x0 and 0x4f.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_AH_ESP
+	tristate "AH/ESP match support"
+	depends on IP_NF_IPTABLES
+	help
+	  These two match extensions (`ah' and `esp') allow you to match a
+	  range of SPIs inside AH or ESP headers of IPSec packets.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_LENGTH
+	tristate "LENGTH match support"
+	depends on IP_NF_IPTABLES
+	help
+	  This option allows you to match the length of a packet against a
+	  specific value or range of values.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_TTL
+	tristate "TTL match support"
+	depends on IP_NF_IPTABLES
+	help
+	  This adds CONFIG_IP_NF_MATCH_TTL option, which enabled the user
+	  to match packets by their TTL value.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_TCPMSS
+	tristate "tcpmss match support"
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a `tcpmss' match, which allows you to examine the
+	  MSS value of TCP SYN packets, which control the maximum packet size
+	  for that connection.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_HELPER
+	tristate "Helper match support"
+	depends on IP_NF_CONNTRACK && IP_NF_IPTABLES
+	help
+	  Helper matching allows you to match packets in dynamic connections
+	  tracked by a conntrack-helper, ie. ip_conntrack_ftp
+
+	  To compile it as a module, choose M here.  If unsure, say Y.
+
+config IP_NF_MATCH_STATE
+	tristate "Connection state match support"
+	depends on IP_NF_CONNTRACK && IP_NF_IPTABLES
+	help
+	  Connection state matching allows you to match packets based on their
+	  relationship to a tracked connection (ie. previous packets).  This
+	  is a powerful tool for packet classification.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_CONNTRACK
+	tristate "Connection tracking match support"
+	depends on IP_NF_CONNTRACK && IP_NF_IPTABLES
+	help
+	  This is a general conntrack match module, a superset of the state match.
+
+	  It allows matching on additional conntrack information, which is
+	  useful in complex configurations, such as NAT gateways with multiple
+	  internet links or tunnels.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_OWNER
+	tristate "Owner match support"
+	depends on IP_NF_IPTABLES
+	help
+	  Packet owner matching allows you to match locally-generated packets
+	  based on who created them: the user, group, process or session.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_PHYSDEV
+	tristate "Physdev match support"
+	depends on IP_NF_IPTABLES && BRIDGE_NETFILTER
+	help
+	  Physdev packet matching matches against the physical bridge ports
+	  the IP packet arrived on or will leave by.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_MATCH_ADDRTYPE
+	tristate  'address type match support'
+	depends on IP_NF_IPTABLES
+	help
+	  This option allows you to match what routing thinks of an address,
+	  eg. UNICAST, LOCAL, BROADCAST, ...
+	
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/modules.txt>.  If unsure, say `N'.
+
+config IP_NF_MATCH_REALM
+	tristate  'realm match support'
+	depends on IP_NF_IPTABLES
+	select NET_CLS_ROUTE
+	help
+	  This option adds a `realm' match, which allows you to use the realm
+	  key from the routing subsystem inside iptables.
+	
+	  This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option 
+	  in tc world.
+	
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/modules.txt>.  If unsure, say `N'.
+
+config IP_NF_MATCH_SCTP
+	tristate  'SCTP protocol match support'
+	depends on IP_NF_IPTABLES
+	help
+	  With this option enabled, you will be able to use the iptables
+	  `sctp' match in order to match on SCTP source/destination ports
+	  and SCTP chunk types.
+
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/modules.txt>.  If unsure, say `N'.
+
+config IP_NF_MATCH_COMMENT
+	tristate  'comment match support'
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a `comment' dummy-match, which allows you to put
+	  comments in your iptables ruleset.
+
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/modules.txt>.  If unsure, say `N'.
+
+config IP_NF_MATCH_CONNMARK
+	tristate  'Connection mark match support'
+	depends on IP_NF_CONNTRACK_MARK && IP_NF_IPTABLES
+	help
+	  This option adds a `connmark' match, which allows you to match the
+	  connection mark value previously set for the session by `CONNMARK'. 
+	
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/modules.txt>.  The module will be called
+	  ipt_connmark.o.  If unsure, say `N'.
+
+config IP_NF_MATCH_HASHLIMIT
+	tristate  'hashlimit match support'
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a new iptables `hashlimit' match.  
+
+	  As opposed to `limit', this match dynamically crates a hash table
+	  of limit buckets, based on your selection of source/destination
+	  ip addresses and/or ports.
+
+	  It enables you to express policies like `10kpps for any given
+	  destination IP' or `500pps from any given source IP'  with a single
+	  IPtables rule.
+
+# `filter', generic and specific targets
+config IP_NF_FILTER
+	tristate "Packet filtering"
+	depends on IP_NF_IPTABLES
+	help
+	  Packet filtering defines a table `filter', which has a series of
+	  rules for simple packet filtering at local input, forwarding and
+	  local output.  See the man page for iptables(8).
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_REJECT
+	tristate "REJECT target support"
+	depends on IP_NF_FILTER
+	help
+	  The REJECT target allows a filtering rule to specify that an ICMP
+	  error should be issued in response to an incoming packet, rather
+	  than silently being dropped.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_LOG
+	tristate "LOG target support"
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a `LOG' target, which allows you to create rules in
+	  any iptables table which records the packet header to the syslog.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_ULOG
+	tristate "ULOG target support"
+	depends on IP_NF_IPTABLES
+	---help---
+	  This option adds a `ULOG' target, which allows you to create rules in
+	  any iptables table. The packet is passed to a userspace logging
+	  daemon using netlink multicast sockets; unlike the LOG target
+	  which can only be viewed through syslog.
+
+	  The apropriate userspace logging daemon (ulogd) may be obtained from
+	  <http://www.gnumonks.org/projects/ulogd/>
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_TCPMSS
+	tristate "TCPMSS target support"
+	depends on IP_NF_IPTABLES
+	---help---
+	  This option adds a `TCPMSS' target, which allows you to alter the
+	  MSS value of TCP SYN packets, to control the maximum size for that
+	  connection (usually limiting it to your outgoing interface's MTU
+	  minus 40).
+
+	  This is used to overcome criminally braindead ISPs or servers which
+	  block ICMP Fragmentation Needed packets.  The symptoms of this
+	  problem are that everything works fine from your Linux
+	  firewall/router, but machines behind it can never exchange large
+	  packets:
+	  	1) Web browsers connect, then hang with no data received.
+	  	2) Small mail works fine, but large emails hang.
+	  	3) ssh works fine, but scp hangs after initial handshaking.
+
+	  Workaround: activate this option and add a rule to your firewall
+	  configuration like:
+
+	  iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
+	  		 -j TCPMSS --clamp-mss-to-pmtu
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+# NAT + specific targets
+config IP_NF_NAT
+	tristate "Full NAT"
+	depends on IP_NF_IPTABLES && IP_NF_CONNTRACK
+	help
+	  The Full NAT option allows masquerading, port forwarding and other
+	  forms of full Network Address Port Translation.  It is controlled by
+	  the `nat' table in iptables: see the man page for iptables(8).
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_NAT_NEEDED
+	bool
+	depends on IP_NF_NAT != n
+	default y
+
+config IP_NF_TARGET_MASQUERADE
+	tristate "MASQUERADE target support"
+	depends on IP_NF_NAT
+	help
+	  Masquerading is a special case of NAT: all outgoing connections are
+	  changed to seem to come from a particular interface's address, and
+	  if the interface goes down, those connections are lost.  This is
+	  only useful for dialup accounts with dynamic IP address (ie. your IP
+	  address will be different on next dialup).
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_REDIRECT
+	tristate "REDIRECT target support"
+	depends on IP_NF_NAT
+	help
+	  REDIRECT is a special case of NAT: all incoming connections are
+	  mapped onto the incoming interface's address, causing the packets to
+	  come to the local machine instead of passing through.  This is
+	  useful for transparent proxies.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_NETMAP
+	tristate "NETMAP target support"
+	depends on IP_NF_NAT
+	help
+	  NETMAP is an implementation of static 1:1 NAT mapping of network
+	  addresses. It maps the network address part, while keeping the host
+	  address part intact. It is similar to Fast NAT, except that
+	  Netfilter's connection tracking doesn't work well with Fast NAT.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_SAME
+	tristate "SAME target support"
+	depends on IP_NF_NAT
+	help
+	  This option adds a `SAME' target, which works like the standard SNAT
+	  target, but attempts to give clients the same IP for all connections.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_NAT_SNMP_BASIC
+	tristate "Basic SNMP-ALG support (EXPERIMENTAL)"
+	depends on EXPERIMENTAL && IP_NF_NAT
+	---help---
+
+	  This module implements an Application Layer Gateway (ALG) for
+	  SNMP payloads.  In conjunction with NAT, it allows a network
+	  management system to access multiple private networks with
+	  conflicting addresses.  It works by modifying IP addresses
+	  inside SNMP payloads to match IP-layer NAT mapping.
+
+	  This is the "basic" form of SNMP-ALG, as described in RFC 2962
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_NAT_IRC
+	tristate
+	depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
+	default IP_NF_NAT if IP_NF_IRC=y
+	default m if IP_NF_IRC=m
+
+# If they want FTP, set to $CONFIG_IP_NF_NAT (m or y), 
+# or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.  Argh.
+config IP_NF_NAT_FTP
+	tristate
+	depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
+	default IP_NF_NAT if IP_NF_FTP=y
+	default m if IP_NF_FTP=m
+
+config IP_NF_NAT_TFTP
+	tristate
+	depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
+	default IP_NF_NAT if IP_NF_TFTP=y
+	default m if IP_NF_TFTP=m
+
+config IP_NF_NAT_AMANDA
+	tristate
+	depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
+	default IP_NF_NAT if IP_NF_AMANDA=y
+	default m if IP_NF_AMANDA=m
+
+# mangle + specific targets
+config IP_NF_MANGLE
+	tristate "Packet mangling"
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a `mangle' table to iptables: see the man page for
+	  iptables(8).  This table is used for various packet alterations
+	  which can effect how the packet is routed.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_TOS
+	tristate "TOS target support"
+	depends on IP_NF_MANGLE
+	help
+	  This option adds a `TOS' target, which allows you to create rules in
+	  the `mangle' table which alter the Type Of Service field of an IP
+	  packet prior to routing.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_ECN
+	tristate "ECN target support"
+	depends on IP_NF_MANGLE
+	---help---
+	  This option adds a `ECN' target, which can be used in the iptables mangle
+	  table.  
+
+	  You can use this target to remove the ECN bits from the IPv4 header of
+	  an IP packet.  This is particularly useful, if you need to work around
+	  existing ECN blackholes on the internet, but don't want to disable
+	  ECN support in general.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_DSCP
+	tristate "DSCP target support"
+	depends on IP_NF_MANGLE
+	help
+	  This option adds a `DSCP' match, which allows you to match against
+	  the IPv4 header DSCP field (DSCP codepoint).
+
+	  The DSCP codepoint can have any value between 0x0 and 0x4f.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_MARK
+	tristate "MARK target support"
+	depends on IP_NF_MANGLE
+	help
+	  This option adds a `MARK' target, which allows you to create rules
+	  in the `mangle' table which alter the netfilter mark (nfmark) field
+	  associated with the packet prior to routing. This can change
+	  the routing method (see `Use netfilter MARK value as routing
+	  key') and can also be used by other subsystems to change their
+	  behavior.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_CLASSIFY
+	tristate "CLASSIFY target support"
+	depends on IP_NF_MANGLE
+	help
+	  This option adds a `CLASSIFY' target, which enables the user to set
+	  the priority of a packet. Some qdiscs can use this value for
+	  classification, among these are:
+
+  	  atm, cbq, dsmark, pfifo_fast, htb, prio
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_TARGET_CONNMARK
+	tristate  'CONNMARK target support'
+	depends on IP_NF_CONNTRACK_MARK && IP_NF_MANGLE
+	help
+	  This option adds a `CONNMARK' target, which allows one to manipulate
+	  the connection mark value.  Similar to the MARK target, but
+	  affects the connection mark value rather than the packet mark value.
+	
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/modules.txt>.  The module will be called
+	  ipt_CONNMARK.o.  If unsure, say `N'.
+
+config IP_NF_TARGET_CLUSTERIP
+	tristate "CLUSTERIP target support (EXPERIMENTAL)"
+	depends on IP_NF_CONNTRACK_MARK && IP_NF_IPTABLES && EXPERIMENTAL
+	help
+	  The CLUSTERIP target allows you to build load-balancing clusters of
+	  network servers without having a dedicated load-balancing
+	  router/server/switch.
+	
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+# raw + specific targets
+config IP_NF_RAW
+	tristate  'raw table support (required for NOTRACK/TRACE)'
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a `raw' table to iptables. This table is the very
+	  first in the netfilter framework and hooks in at the PREROUTING
+	  and OUTPUT chains.
+	
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/modules.txt>.  If unsure, say `N'.
+
+config IP_NF_TARGET_NOTRACK
+	tristate  'NOTRACK target support'
+	depends on IP_NF_RAW
+	depends on IP_NF_CONNTRACK
+	help
+	  The NOTRACK target allows a select rule to specify
+	  which packets *not* to enter the conntrack/NAT
+	  subsystem with all the consequences (no ICMP error tracking,
+	  no protocol helpers for the selected packets).
+	
+	  If you want to compile it as a module, say M here and read
+	  <file:Documentation/modules.txt>.  If unsure, say `N'.
+
+
+# ARP tables
+config IP_NF_ARPTABLES
+	tristate "ARP tables support"
+	help
+	  arptables is a general, extensible packet identification framework.
+	  The ARP packet filtering and mangling (manipulation)subsystems
+	  use this: say Y or M here if you want to use either of those.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_ARPFILTER
+	tristate "ARP packet filtering"
+	depends on IP_NF_ARPTABLES
+	help
+	  ARP packet filtering defines a table `filter', which has a series of
+	  rules for simple ARP packet filtering at local input and
+	  local output.  On a bridge, you can also specify filtering rules
+	  for forwarded ARP packets. See the man page for arptables(8).
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
+config IP_NF_ARP_MANGLE
+	tristate "ARP payload mangling"
+	depends on IP_NF_ARPTABLES
+	help
+	  Allows altering the ARP packet payload: source and destination
+	  hardware and network addresses.
+
+endmenu
+
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
new file mode 100644
index 000000000000..45796d5924dd
--- /dev/null
+++ b/net/ipv4/netfilter/Makefile
@@ -0,0 +1,89 @@
+#
+# Makefile for the netfilter modules on top of IPv4.
+#
+
+# objects for the standalone - connection tracking / NAT
+ip_conntrack-objs	:= ip_conntrack_standalone.o ip_conntrack_core.o ip_conntrack_proto_generic.o ip_conntrack_proto_tcp.o ip_conntrack_proto_udp.o ip_conntrack_proto_icmp.o
+iptable_nat-objs	:= ip_nat_standalone.o ip_nat_rule.o ip_nat_core.o ip_nat_helper.o ip_nat_proto_unknown.o ip_nat_proto_tcp.o ip_nat_proto_udp.o ip_nat_proto_icmp.o
+
+# connection tracking
+obj-$(CONFIG_IP_NF_CONNTRACK) += ip_conntrack.o
+
+# SCTP protocol connection tracking
+obj-$(CONFIG_IP_NF_CT_PROTO_SCTP) += ip_conntrack_proto_sctp.o
+
+# connection tracking helpers
+obj-$(CONFIG_IP_NF_AMANDA) += ip_conntrack_amanda.o
+obj-$(CONFIG_IP_NF_TFTP) += ip_conntrack_tftp.o
+obj-$(CONFIG_IP_NF_FTP) += ip_conntrack_ftp.o
+obj-$(CONFIG_IP_NF_IRC) += ip_conntrack_irc.o
+
+# NAT helpers 
+obj-$(CONFIG_IP_NF_NAT_AMANDA) += ip_nat_amanda.o
+obj-$(CONFIG_IP_NF_NAT_TFTP) += ip_nat_tftp.o
+obj-$(CONFIG_IP_NF_NAT_FTP) += ip_nat_ftp.o
+obj-$(CONFIG_IP_NF_NAT_IRC) += ip_nat_irc.o
+
+# generic IP tables 
+obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
+
+# the three instances of ip_tables
+obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o
+obj-$(CONFIG_IP_NF_MANGLE) += iptable_mangle.o
+obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o
+obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
+
+# matches
+obj-$(CONFIG_IP_NF_MATCH_HELPER) += ipt_helper.o
+obj-$(CONFIG_IP_NF_MATCH_LIMIT) += ipt_limit.o
+obj-$(CONFIG_IP_NF_MATCH_HASHLIMIT) += ipt_hashlimit.o
+obj-$(CONFIG_IP_NF_MATCH_SCTP) += ipt_sctp.o
+obj-$(CONFIG_IP_NF_MATCH_MARK) += ipt_mark.o
+obj-$(CONFIG_IP_NF_MATCH_MAC) += ipt_mac.o
+obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o
+obj-$(CONFIG_IP_NF_MATCH_PKTTYPE) += ipt_pkttype.o
+obj-$(CONFIG_IP_NF_MATCH_MULTIPORT) += ipt_multiport.o
+obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
+obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
+obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
+obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
+obj-$(CONFIG_IP_NF_MATCH_DSCP) += ipt_dscp.o
+obj-$(CONFIG_IP_NF_MATCH_AH_ESP) += ipt_ah.o ipt_esp.o
+obj-$(CONFIG_IP_NF_MATCH_LENGTH) += ipt_length.o
+obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
+obj-$(CONFIG_IP_NF_MATCH_STATE) += ipt_state.o
+obj-$(CONFIG_IP_NF_MATCH_CONNMARK) += ipt_connmark.o
+obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += ipt_conntrack.o
+obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
+obj-$(CONFIG_IP_NF_MATCH_REALM) += ipt_realm.o
+obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o
+obj-$(CONFIG_IP_NF_MATCH_PHYSDEV) += ipt_physdev.o
+obj-$(CONFIG_IP_NF_MATCH_COMMENT) += ipt_comment.o
+
+# targets
+obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
+obj-$(CONFIG_IP_NF_TARGET_TOS) += ipt_TOS.o
+obj-$(CONFIG_IP_NF_TARGET_ECN) += ipt_ECN.o
+obj-$(CONFIG_IP_NF_TARGET_DSCP) += ipt_DSCP.o
+obj-$(CONFIG_IP_NF_TARGET_MARK) += ipt_MARK.o
+obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
+obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
+obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
+obj-$(CONFIG_IP_NF_TARGET_SAME) += ipt_SAME.o
+obj-$(CONFIG_IP_NF_TARGET_CLASSIFY) += ipt_CLASSIFY.o
+obj-$(CONFIG_IP_NF_NAT_SNMP_BASIC) += ip_nat_snmp_basic.o
+obj-$(CONFIG_IP_NF_TARGET_LOG) += ipt_LOG.o
+obj-$(CONFIG_IP_NF_TARGET_CONNMARK) += ipt_CONNMARK.o
+obj-$(CONFIG_IP_NF_TARGET_ULOG) += ipt_ULOG.o
+obj-$(CONFIG_IP_NF_TARGET_TCPMSS) += ipt_TCPMSS.o
+obj-$(CONFIG_IP_NF_TARGET_NOTRACK) += ipt_NOTRACK.o
+obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o
+
+# generic ARP tables
+obj-$(CONFIG_IP_NF_ARPTABLES) += arp_tables.o
+obj-$(CONFIG_IP_NF_ARP_MANGLE) += arpt_mangle.o
+
+# just filtering instance of ARP tables for now
+obj-$(CONFIG_IP_NF_ARPFILTER) += arptable_filter.o
+
+obj-$(CONFIG_IP_NF_QUEUE) += ip_queue.o
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
new file mode 100644
index 000000000000..df79f5ed6a0a
--- /dev/null
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -0,0 +1,1333 @@
+/*
+ * Packet matching code for ARP packets.
+ *
+ * Based heavily, if not almost entirely, upon ip_tables.c framework.
+ *
+ * Some ARP specific bits are:
+ *
+ * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/kmod.h>
+#include <linux/vmalloc.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+
+#include <linux/netfilter_arp/arp_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
+MODULE_DESCRIPTION("arptables core");
+
+/*#define DEBUG_ARP_TABLES*/
+/*#define DEBUG_ARP_TABLES_USER*/
+
+#ifdef DEBUG_ARP_TABLES
+#define dprintf(format, args...)  printk(format , ## args)
+#else
+#define dprintf(format, args...)
+#endif
+
+#ifdef DEBUG_ARP_TABLES_USER
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+#ifdef CONFIG_NETFILTER_DEBUG
+#define ARP_NF_ASSERT(x)					\
+do {								\
+	if (!(x))						\
+		printk("ARP_NF_ASSERT: %s:%s:%u\n",		\
+		       __FUNCTION__, __FILE__, __LINE__);	\
+} while(0)
+#else
+#define ARP_NF_ASSERT(x)
+#endif
+#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
+
+static DECLARE_MUTEX(arpt_mutex);
+
+#define ASSERT_READ_LOCK(x) ARP_NF_ASSERT(down_trylock(&arpt_mutex) != 0)
+#define ASSERT_WRITE_LOCK(x) ARP_NF_ASSERT(down_trylock(&arpt_mutex) != 0)
+#include <linux/netfilter_ipv4/lockhelp.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+struct arpt_table_info {
+	unsigned int size;
+	unsigned int number;
+	unsigned int initial_entries;
+	unsigned int hook_entry[NF_ARP_NUMHOOKS];
+	unsigned int underflow[NF_ARP_NUMHOOKS];
+	char entries[0] __attribute__((aligned(SMP_CACHE_BYTES)));
+};
+
+static LIST_HEAD(arpt_target);
+static LIST_HEAD(arpt_tables);
+#define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0)
+
+#ifdef CONFIG_SMP
+#define TABLE_OFFSET(t,p) (SMP_ALIGN((t)->size)*(p))
+#else
+#define TABLE_OFFSET(t,p) 0
+#endif
+
+static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
+				      char *hdr_addr, int len)
+{
+	int i, ret;
+
+	if (len > ARPT_DEV_ADDR_LEN_MAX)
+		len = ARPT_DEV_ADDR_LEN_MAX;
+
+	ret = 0;
+	for (i = 0; i < len; i++)
+		ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i];
+
+	return (ret != 0);
+}
+
+/* Returns whether packet matches rule or not. */
+static inline int arp_packet_match(const struct arphdr *arphdr,
+				   struct net_device *dev,
+				   const char *indev,
+				   const char *outdev,
+				   const struct arpt_arp *arpinfo)
+{
+	char *arpptr = (char *)(arphdr + 1);
+	char *src_devaddr, *tgt_devaddr;
+	u32 src_ipaddr, tgt_ipaddr;
+	int i, ret;
+
+#define FWINV(bool,invflg) ((bool) ^ !!(arpinfo->invflags & invflg))
+
+	if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop,
+		  ARPT_INV_ARPOP)) {
+		dprintf("ARP operation field mismatch.\n");
+		dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n",
+			arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask);
+		return 0;
+	}
+
+	if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd,
+		  ARPT_INV_ARPHRD)) {
+		dprintf("ARP hardware address format mismatch.\n");
+		dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n",
+			arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask);
+		return 0;
+	}
+
+	if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro,
+		  ARPT_INV_ARPPRO)) {
+		dprintf("ARP protocol address format mismatch.\n");
+		dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n",
+			arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask);
+		return 0;
+	}
+
+	if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln,
+		  ARPT_INV_ARPHLN)) {
+		dprintf("ARP hardware address length mismatch.\n");
+		dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n",
+			arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask);
+		return 0;
+	}
+
+	src_devaddr = arpptr;
+	arpptr += dev->addr_len;
+	memcpy(&src_ipaddr, arpptr, sizeof(u32));
+	arpptr += sizeof(u32);
+	tgt_devaddr = arpptr;
+	arpptr += dev->addr_len;
+	memcpy(&tgt_ipaddr, arpptr, sizeof(u32));
+
+	if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len),
+		  ARPT_INV_SRCDEVADDR) ||
+	    FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len),
+		  ARPT_INV_TGTDEVADDR)) {
+		dprintf("Source or target device address mismatch.\n");
+
+		return 0;
+	}
+
+	if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr,
+		  ARPT_INV_SRCIP) ||
+	    FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr),
+		  ARPT_INV_TGTIP)) {
+		dprintf("Source or target IP address mismatch.\n");
+
+		dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n",
+			NIPQUAD(src_ipaddr),
+			NIPQUAD(arpinfo->smsk.s_addr),
+			NIPQUAD(arpinfo->src.s_addr),
+			arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : "");
+		dprintf("TGT: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n",
+			NIPQUAD(tgt_ipaddr),
+			NIPQUAD(arpinfo->tmsk.s_addr),
+			NIPQUAD(arpinfo->tgt.s_addr),
+			arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : "");
+		return 0;
+	}
+
+	/* Look for ifname matches.  */
+	for (i = 0, ret = 0; i < IFNAMSIZ; i++) {
+		ret |= (indev[i] ^ arpinfo->iniface[i])
+			& arpinfo->iniface_mask[i];
+	}
+
+	if (FWINV(ret != 0, ARPT_INV_VIA_IN)) {
+		dprintf("VIA in mismatch (%s vs %s).%s\n",
+			indev, arpinfo->iniface,
+			arpinfo->invflags&ARPT_INV_VIA_IN ?" (INV)":"");
+		return 0;
+	}
+
+	for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
+		unsigned long odev;
+		memcpy(&odev, outdev + i*sizeof(unsigned long),
+		       sizeof(unsigned long));
+		ret |= (odev
+			^ ((const unsigned long *)arpinfo->outiface)[i])
+			& ((const unsigned long *)arpinfo->outiface_mask)[i];
+	}
+
+	if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) {
+		dprintf("VIA out mismatch (%s vs %s).%s\n",
+			outdev, arpinfo->outiface,
+			arpinfo->invflags&ARPT_INV_VIA_OUT ?" (INV)":"");
+		return 0;
+	}
+
+	return 1;
+}
+
+static inline int arp_checkentry(const struct arpt_arp *arp)
+{
+	if (arp->flags & ~ARPT_F_MASK) {
+		duprintf("Unknown flag bits set: %08X\n",
+			 arp->flags & ~ARPT_F_MASK);
+		return 0;
+	}
+	if (arp->invflags & ~ARPT_INV_MASK) {
+		duprintf("Unknown invflag bits set: %08X\n",
+			 arp->invflags & ~ARPT_INV_MASK);
+		return 0;
+	}
+
+	return 1;
+}
+
+static unsigned int arpt_error(struct sk_buff **pskb,
+			       unsigned int hooknum,
+			       const struct net_device *in,
+			       const struct net_device *out,
+			       const void *targinfo,
+			       void *userinfo)
+{
+	if (net_ratelimit())
+		printk("arp_tables: error: '%s'\n", (char *)targinfo);
+
+	return NF_DROP;
+}
+
+static inline struct arpt_entry *get_entry(void *base, unsigned int offset)
+{
+	return (struct arpt_entry *)(base + offset);
+}
+
+unsigned int arpt_do_table(struct sk_buff **pskb,
+			   unsigned int hook,
+			   const struct net_device *in,
+			   const struct net_device *out,
+			   struct arpt_table *table,
+			   void *userdata)
+{
+	static const char nulldevname[IFNAMSIZ];
+	unsigned int verdict = NF_DROP;
+	struct arphdr *arp;
+	int hotdrop = 0;
+	struct arpt_entry *e, *back;
+	const char *indev, *outdev;
+	void *table_base;
+
+	/* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
+	if (!pskb_may_pull((*pskb), (sizeof(struct arphdr) +
+				     (2 * (*pskb)->dev->addr_len) +
+				     (2 * sizeof(u32)))))
+		return NF_DROP;
+
+	indev = in ? in->name : nulldevname;
+	outdev = out ? out->name : nulldevname;
+
+	read_lock_bh(&table->lock);
+	table_base = (void *)table->private->entries
+		+ TABLE_OFFSET(table->private,
+			       smp_processor_id());
+	e = get_entry(table_base, table->private->hook_entry[hook]);
+	back = get_entry(table_base, table->private->underflow[hook]);
+
+	arp = (*pskb)->nh.arph;
+	do {
+		if (arp_packet_match(arp, (*pskb)->dev, indev, outdev, &e->arp)) {
+			struct arpt_entry_target *t;
+			int hdr_len;
+
+			hdr_len = sizeof(*arp) + (2 * sizeof(struct in_addr)) +
+				(2 * (*pskb)->dev->addr_len);
+			ADD_COUNTER(e->counters, hdr_len, 1);
+
+			t = arpt_get_target(e);
+
+			/* Standard target? */
+			if (!t->u.kernel.target->target) {
+				int v;
+
+				v = ((struct arpt_standard_target *)t)->verdict;
+				if (v < 0) {
+					/* Pop from stack? */
+					if (v != ARPT_RETURN) {
+						verdict = (unsigned)(-v) - 1;
+						break;
+					}
+					e = back;
+					back = get_entry(table_base,
+							 back->comefrom);
+					continue;
+				}
+				if (table_base + v
+				    != (void *)e + e->next_offset) {
+					/* Save old back ptr in next entry */
+					struct arpt_entry *next
+						= (void *)e + e->next_offset;
+					next->comefrom =
+						(void *)back - table_base;
+
+					/* set back pointer to next entry */
+					back = next;
+				}
+
+				e = get_entry(table_base, v);
+			} else {
+				/* Targets which reenter must return
+				 * abs. verdicts
+				 */
+				verdict = t->u.kernel.target->target(pskb,
+								     hook,
+								     in, out,
+								     t->data,
+								     userdata);
+
+				/* Target might have changed stuff. */
+				arp = (*pskb)->nh.arph;
+
+				if (verdict == ARPT_CONTINUE)
+					e = (void *)e + e->next_offset;
+				else
+					/* Verdict */
+					break;
+			}
+		} else {
+			e = (void *)e + e->next_offset;
+		}
+	} while (!hotdrop);
+	read_unlock_bh(&table->lock);
+
+	if (hotdrop)
+		return NF_DROP;
+	else
+		return verdict;
+}
+
+static inline void *find_inlist_lock_noload(struct list_head *head,
+					    const char *name,
+					    int *error,
+					    struct semaphore *mutex)
+{
+	void *ret;
+
+	*error = down_interruptible(mutex);
+	if (*error != 0)
+		return NULL;
+
+	ret = list_named_find(head, name);
+	if (!ret) {
+		*error = -ENOENT;
+		up(mutex);
+	}
+	return ret;
+}
+
+#ifndef CONFIG_KMOD
+#define find_inlist_lock(h,n,p,e,m) find_inlist_lock_noload((h),(n),(e),(m))
+#else
+static void *
+find_inlist_lock(struct list_head *head,
+		 const char *name,
+		 const char *prefix,
+		 int *error,
+		 struct semaphore *mutex)
+{
+	void *ret;
+
+	ret = find_inlist_lock_noload(head, name, error, mutex);
+	if (!ret) {
+		duprintf("find_inlist: loading `%s%s'.\n", prefix, name);
+		request_module("%s%s", prefix, name);
+		ret = find_inlist_lock_noload(head, name, error, mutex);
+	}
+
+	return ret;
+}
+#endif
+
+static inline struct arpt_table *arpt_find_table_lock(const char *name, int *error, struct semaphore *mutex)
+{
+	return find_inlist_lock(&arpt_tables, name, "arptable_", error, mutex);
+}
+
+static struct arpt_target *arpt_find_target_lock(const char *name, int *error, struct semaphore *mutex)
+{
+	return find_inlist_lock(&arpt_target, name, "arpt_", error, mutex);
+}
+
+/* All zeroes == unconditional rule. */
+static inline int unconditional(const struct arpt_arp *arp)
+{
+	unsigned int i;
+
+	for (i = 0; i < sizeof(*arp)/sizeof(__u32); i++)
+		if (((__u32 *)arp)[i])
+			return 0;
+
+	return 1;
+}
+
+/* Figures out from what hook each rule can be called: returns 0 if
+ * there are loops.  Puts hook bitmask in comefrom.
+ */
+static int mark_source_chains(struct arpt_table_info *newinfo, unsigned int valid_hooks)
+{
+	unsigned int hook;
+
+	/* No recursion; use packet counter to save back ptrs (reset
+	 * to 0 as we leave), and comefrom to save source hook bitmask.
+	 */
+	for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) {
+		unsigned int pos = newinfo->hook_entry[hook];
+		struct arpt_entry *e
+			= (struct arpt_entry *)(newinfo->entries + pos);
+
+		if (!(valid_hooks & (1 << hook)))
+			continue;
+
+		/* Set initial back pointer. */
+		e->counters.pcnt = pos;
+
+		for (;;) {
+			struct arpt_standard_target *t
+				= (void *)arpt_get_target(e);
+
+			if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) {
+				printk("arptables: loop hook %u pos %u %08X.\n",
+				       hook, pos, e->comefrom);
+				return 0;
+			}
+			e->comefrom
+				|= ((1 << hook) | (1 << NF_ARP_NUMHOOKS));
+
+			/* Unconditional return/END. */
+			if (e->target_offset == sizeof(struct arpt_entry)
+			    && (strcmp(t->target.u.user.name,
+				       ARPT_STANDARD_TARGET) == 0)
+			    && t->verdict < 0
+			    && unconditional(&e->arp)) {
+				unsigned int oldpos, size;
+
+				/* Return: backtrack through the last
+				 * big jump.
+				 */
+				do {
+					e->comefrom ^= (1<<NF_ARP_NUMHOOKS);
+					oldpos = pos;
+					pos = e->counters.pcnt;
+					e->counters.pcnt = 0;
+
+					/* We're at the start. */
+					if (pos == oldpos)
+						goto next;
+
+					e = (struct arpt_entry *)
+						(newinfo->entries + pos);
+				} while (oldpos == pos + e->next_offset);
+
+				/* Move along one */
+				size = e->next_offset;
+				e = (struct arpt_entry *)
+					(newinfo->entries + pos + size);
+				e->counters.pcnt = pos;
+				pos += size;
+			} else {
+				int newpos = t->verdict;
+
+				if (strcmp(t->target.u.user.name,
+					   ARPT_STANDARD_TARGET) == 0
+				    && newpos >= 0) {
+					/* This a jump; chase it. */
+					duprintf("Jump rule %u -> %u\n",
+						 pos, newpos);
+				} else {
+					/* ... this is a fallthru */
+					newpos = pos + e->next_offset;
+				}
+				e = (struct arpt_entry *)
+					(newinfo->entries + newpos);
+				e->counters.pcnt = pos;
+				pos = newpos;
+			}
+		}
+		next:
+		duprintf("Finished chain %u\n", hook);
+	}
+	return 1;
+}
+
+static inline int standard_check(const struct arpt_entry_target *t,
+				 unsigned int max_offset)
+{
+	struct arpt_standard_target *targ = (void *)t;
+
+	/* Check standard info. */
+	if (t->u.target_size
+	    != ARPT_ALIGN(sizeof(struct arpt_standard_target))) {
+		duprintf("arpt_standard_check: target size %u != %Zu\n",
+			 t->u.target_size,
+			 ARPT_ALIGN(sizeof(struct arpt_standard_target)));
+		return 0;
+	}
+
+	if (targ->verdict >= 0
+	    && targ->verdict > max_offset - sizeof(struct arpt_entry)) {
+		duprintf("arpt_standard_check: bad verdict (%i)\n",
+			 targ->verdict);
+		return 0;
+	}
+
+	if (targ->verdict < -NF_MAX_VERDICT - 1) {
+		duprintf("arpt_standard_check: bad negative verdict (%i)\n",
+			 targ->verdict);
+		return 0;
+	}
+	return 1;
+}
+
+static struct arpt_target arpt_standard_target;
+
+static inline int check_entry(struct arpt_entry *e, const char *name, unsigned int size,
+			      unsigned int *i)
+{
+	struct arpt_entry_target *t;
+	struct arpt_target *target;
+	int ret;
+
+	if (!arp_checkentry(&e->arp)) {
+		duprintf("arp_tables: arp check failed %p %s.\n", e, name);
+		return -EINVAL;
+	}
+
+	t = arpt_get_target(e);
+	target = arpt_find_target_lock(t->u.user.name, &ret, &arpt_mutex);
+	if (!target) {
+		duprintf("check_entry: `%s' not found\n", t->u.user.name);
+		goto out;
+	}
+	if (!try_module_get((target->me))) {
+		ret = -ENOENT;
+		goto out_unlock;
+	}
+	t->u.kernel.target = target;
+	up(&arpt_mutex);
+
+	if (t->u.kernel.target == &arpt_standard_target) {
+		if (!standard_check(t, size)) {
+			ret = -EINVAL;
+			goto out;
+		}
+	} else if (t->u.kernel.target->checkentry
+		   && !t->u.kernel.target->checkentry(name, e, t->data,
+						      t->u.target_size
+						      - sizeof(*t),
+						      e->comefrom)) {
+		module_put(t->u.kernel.target->me);
+		duprintf("arp_tables: check failed for `%s'.\n",
+			 t->u.kernel.target->name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	(*i)++;
+	return 0;
+
+out_unlock:
+	up(&arpt_mutex);
+out:
+	return ret;
+}
+
+static inline int check_entry_size_and_hooks(struct arpt_entry *e,
+					     struct arpt_table_info *newinfo,
+					     unsigned char *base,
+					     unsigned char *limit,
+					     const unsigned int *hook_entries,
+					     const unsigned int *underflows,
+					     unsigned int *i)
+{
+	unsigned int h;
+
+	if ((unsigned long)e % __alignof__(struct arpt_entry) != 0
+	    || (unsigned char *)e + sizeof(struct arpt_entry) >= limit) {
+		duprintf("Bad offset %p\n", e);
+		return -EINVAL;
+	}
+
+	if (e->next_offset
+	    < sizeof(struct arpt_entry) + sizeof(struct arpt_entry_target)) {
+		duprintf("checking: element %p size %u\n",
+			 e, e->next_offset);
+		return -EINVAL;
+	}
+
+	/* Check hooks & underflows */
+	for (h = 0; h < NF_ARP_NUMHOOKS; h++) {
+		if ((unsigned char *)e - base == hook_entries[h])
+			newinfo->hook_entry[h] = hook_entries[h];
+		if ((unsigned char *)e - base == underflows[h])
+			newinfo->underflow[h] = underflows[h];
+	}
+
+	/* FIXME: underflows must be unconditional, standard verdicts
+           < 0 (not ARPT_RETURN). --RR */
+
+	/* Clear counters and comefrom */
+	e->counters = ((struct arpt_counters) { 0, 0 });
+	e->comefrom = 0;
+
+	(*i)++;
+	return 0;
+}
+
+static inline int cleanup_entry(struct arpt_entry *e, unsigned int *i)
+{
+	struct arpt_entry_target *t;
+
+	if (i && (*i)-- == 0)
+		return 1;
+
+	t = arpt_get_target(e);
+	if (t->u.kernel.target->destroy)
+		t->u.kernel.target->destroy(t->data,
+					    t->u.target_size - sizeof(*t));
+	module_put(t->u.kernel.target->me);
+	return 0;
+}
+
+/* Checks and translates the user-supplied table segment (held in
+ * newinfo).
+ */
+static int translate_table(const char *name,
+			   unsigned int valid_hooks,
+			   struct arpt_table_info *newinfo,
+			   unsigned int size,
+			   unsigned int number,
+			   const unsigned int *hook_entries,
+			   const unsigned int *underflows)
+{
+	unsigned int i;
+	int ret;
+
+	newinfo->size = size;
+	newinfo->number = number;
+
+	/* Init all hooks to impossible value. */
+	for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
+		newinfo->hook_entry[i] = 0xFFFFFFFF;
+		newinfo->underflow[i] = 0xFFFFFFFF;
+	}
+
+	duprintf("translate_table: size %u\n", newinfo->size);
+	i = 0;
+
+	/* Walk through entries, checking offsets. */
+	ret = ARPT_ENTRY_ITERATE(newinfo->entries, newinfo->size,
+				 check_entry_size_and_hooks,
+				 newinfo,
+				 newinfo->entries,
+				 newinfo->entries + size,
+				 hook_entries, underflows, &i);
+	duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret);
+	if (ret != 0)
+		return ret;
+
+	if (i != number) {
+		duprintf("translate_table: %u not %u entries\n",
+			 i, number);
+		return -EINVAL;
+	}
+
+	/* Check hooks all assigned */
+	for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
+		/* Only hooks which are valid */
+		if (!(valid_hooks & (1 << i)))
+			continue;
+		if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
+			duprintf("Invalid hook entry %u %u\n",
+				 i, hook_entries[i]);
+			return -EINVAL;
+		}
+		if (newinfo->underflow[i] == 0xFFFFFFFF) {
+			duprintf("Invalid underflow %u %u\n",
+				 i, underflows[i]);
+			return -EINVAL;
+		}
+	}
+
+	if (!mark_source_chains(newinfo, valid_hooks)) {
+		duprintf("Looping hook\n");
+		return -ELOOP;
+	}
+
+	/* Finally, each sanity check must pass */
+	i = 0;
+	ret = ARPT_ENTRY_ITERATE(newinfo->entries, newinfo->size,
+				 check_entry, name, size, &i);
+
+	if (ret != 0) {
+		ARPT_ENTRY_ITERATE(newinfo->entries, newinfo->size,
+				   cleanup_entry, &i);
+		return ret;
+	}
+
+	/* And one copy for every other CPU */
+	for (i = 1; i < num_possible_cpus(); i++) {
+		memcpy(newinfo->entries + SMP_ALIGN(newinfo->size)*i,
+		       newinfo->entries,
+		       SMP_ALIGN(newinfo->size));
+	}
+
+	return ret;
+}
+
+static struct arpt_table_info *replace_table(struct arpt_table *table,
+					     unsigned int num_counters,
+					     struct arpt_table_info *newinfo,
+					     int *error)
+{
+	struct arpt_table_info *oldinfo;
+
+	/* Do the substitution. */
+	write_lock_bh(&table->lock);
+	/* Check inside lock: is the old number correct? */
+	if (num_counters != table->private->number) {
+		duprintf("num_counters != table->private->number (%u/%u)\n",
+			 num_counters, table->private->number);
+		write_unlock_bh(&table->lock);
+		*error = -EAGAIN;
+		return NULL;
+	}
+	oldinfo = table->private;
+	table->private = newinfo;
+	newinfo->initial_entries = oldinfo->initial_entries;
+	write_unlock_bh(&table->lock);
+
+	return oldinfo;
+}
+
+/* Gets counters. */
+static inline int add_entry_to_counter(const struct arpt_entry *e,
+				       struct arpt_counters total[],
+				       unsigned int *i)
+{
+	ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt);
+
+	(*i)++;
+	return 0;
+}
+
+static void get_counters(const struct arpt_table_info *t,
+			 struct arpt_counters counters[])
+{
+	unsigned int cpu;
+	unsigned int i;
+
+	for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
+		i = 0;
+		ARPT_ENTRY_ITERATE(t->entries + TABLE_OFFSET(t, cpu),
+				   t->size,
+				   add_entry_to_counter,
+				   counters,
+				   &i);
+	}
+}
+
+static int copy_entries_to_user(unsigned int total_size,
+				struct arpt_table *table,
+				void __user *userptr)
+{
+	unsigned int off, num, countersize;
+	struct arpt_entry *e;
+	struct arpt_counters *counters;
+	int ret = 0;
+
+	/* We need atomic snapshot of counters: rest doesn't change
+	 * (other than comefrom, which userspace doesn't care
+	 * about).
+	 */
+	countersize = sizeof(struct arpt_counters) * table->private->number;
+	counters = vmalloc(countersize);
+
+	if (counters == NULL)
+		return -ENOMEM;
+
+	/* First, sum counters... */
+	memset(counters, 0, countersize);
+	write_lock_bh(&table->lock);
+	get_counters(table->private, counters);
+	write_unlock_bh(&table->lock);
+
+	/* ... then copy entire thing from CPU 0... */
+	if (copy_to_user(userptr, table->private->entries, total_size) != 0) {
+		ret = -EFAULT;
+		goto free_counters;
+	}
+
+	/* FIXME: use iterator macros --RR */
+	/* ... then go back and fix counters and names */
+	for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
+		struct arpt_entry_target *t;
+
+		e = (struct arpt_entry *)(table->private->entries + off);
+		if (copy_to_user(userptr + off
+				 + offsetof(struct arpt_entry, counters),
+				 &counters[num],
+				 sizeof(counters[num])) != 0) {
+			ret = -EFAULT;
+			goto free_counters;
+		}
+
+		t = arpt_get_target(e);
+		if (copy_to_user(userptr + off + e->target_offset
+				 + offsetof(struct arpt_entry_target,
+					    u.user.name),
+				 t->u.kernel.target->name,
+				 strlen(t->u.kernel.target->name)+1) != 0) {
+			ret = -EFAULT;
+			goto free_counters;
+		}
+	}
+
+ free_counters:
+	vfree(counters);
+	return ret;
+}
+
+static int get_entries(const struct arpt_get_entries *entries,
+		       struct arpt_get_entries __user *uptr)
+{
+	int ret;
+	struct arpt_table *t;
+
+	t = arpt_find_table_lock(entries->name, &ret, &arpt_mutex);
+	if (t) {
+		duprintf("t->private->number = %u\n",
+			 t->private->number);
+		if (entries->size == t->private->size)
+			ret = copy_entries_to_user(t->private->size,
+						   t, uptr->entrytable);
+		else {
+			duprintf("get_entries: I've got %u not %u!\n",
+				 t->private->size,
+				 entries->size);
+			ret = -EINVAL;
+		}
+		up(&arpt_mutex);
+	} else
+		duprintf("get_entries: Can't find %s!\n",
+			 entries->name);
+
+	return ret;
+}
+
+static int do_replace(void __user *user, unsigned int len)
+{
+	int ret;
+	struct arpt_replace tmp;
+	struct arpt_table *t;
+	struct arpt_table_info *newinfo, *oldinfo;
+	struct arpt_counters *counters;
+
+	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+		return -EFAULT;
+
+	/* Hack: Causes ipchains to give correct error msg --RR */
+	if (len != sizeof(tmp) + tmp.size)
+		return -ENOPROTOOPT;
+
+	/* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
+	if ((SMP_ALIGN(tmp.size) >> PAGE_SHIFT) + 2 > num_physpages)
+		return -ENOMEM;
+
+	newinfo = vmalloc(sizeof(struct arpt_table_info)
+			  + SMP_ALIGN(tmp.size) * num_possible_cpus());
+	if (!newinfo)
+		return -ENOMEM;
+
+	if (copy_from_user(newinfo->entries, user + sizeof(tmp),
+			   tmp.size) != 0) {
+		ret = -EFAULT;
+		goto free_newinfo;
+	}
+
+	counters = vmalloc(tmp.num_counters * sizeof(struct arpt_counters));
+	if (!counters) {
+		ret = -ENOMEM;
+		goto free_newinfo;
+	}
+	memset(counters, 0, tmp.num_counters * sizeof(struct arpt_counters));
+
+	ret = translate_table(tmp.name, tmp.valid_hooks,
+			      newinfo, tmp.size, tmp.num_entries,
+			      tmp.hook_entry, tmp.underflow);
+	if (ret != 0)
+		goto free_newinfo_counters;
+
+	duprintf("arp_tables: Translated table\n");
+
+	t = arpt_find_table_lock(tmp.name, &ret, &arpt_mutex);
+	if (!t)
+		goto free_newinfo_counters_untrans;
+
+	/* You lied! */
+	if (tmp.valid_hooks != t->valid_hooks) {
+		duprintf("Valid hook crap: %08X vs %08X\n",
+			 tmp.valid_hooks, t->valid_hooks);
+		ret = -EINVAL;
+		goto free_newinfo_counters_untrans_unlock;
+	}
+
+	/* Get a reference in advance, we're not allowed fail later */
+	if (!try_module_get(t->me)) {
+		ret = -EBUSY;
+		goto free_newinfo_counters_untrans_unlock;
+	}
+
+	oldinfo = replace_table(t, tmp.num_counters, newinfo, &ret);
+	if (!oldinfo)
+		goto put_module;
+
+	/* Update module usage count based on number of rules */
+	duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
+		oldinfo->number, oldinfo->initial_entries, newinfo->number);
+	if ((oldinfo->number > oldinfo->initial_entries) || 
+	    (newinfo->number <= oldinfo->initial_entries)) 
+		module_put(t->me);
+	if ((oldinfo->number > oldinfo->initial_entries) &&
+	    (newinfo->number <= oldinfo->initial_entries))
+		module_put(t->me);
+
+	/* Get the old counters. */
+	get_counters(oldinfo, counters);
+	/* Decrease module usage counts and free resource */
+	ARPT_ENTRY_ITERATE(oldinfo->entries, oldinfo->size, cleanup_entry,NULL);
+	vfree(oldinfo);
+	if (copy_to_user(tmp.counters, counters,
+			 sizeof(struct arpt_counters) * tmp.num_counters) != 0)
+		ret = -EFAULT;
+	vfree(counters);
+	up(&arpt_mutex);
+	return ret;
+
+ put_module:
+	module_put(t->me);
+ free_newinfo_counters_untrans_unlock:
+	up(&arpt_mutex);
+ free_newinfo_counters_untrans:
+	ARPT_ENTRY_ITERATE(newinfo->entries, newinfo->size, cleanup_entry, NULL);
+ free_newinfo_counters:
+	vfree(counters);
+ free_newinfo:
+	vfree(newinfo);
+	return ret;
+}
+
+/* We're lazy, and add to the first CPU; overflow works its fey magic
+ * and everything is OK.
+ */
+static inline int add_counter_to_entry(struct arpt_entry *e,
+				       const struct arpt_counters addme[],
+				       unsigned int *i)
+{
+
+	ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
+
+	(*i)++;
+	return 0;
+}
+
+static int do_add_counters(void __user *user, unsigned int len)
+{
+	unsigned int i;
+	struct arpt_counters_info tmp, *paddc;
+	struct arpt_table *t;
+	int ret;
+
+	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+		return -EFAULT;
+
+	if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct arpt_counters))
+		return -EINVAL;
+
+	paddc = vmalloc(len);
+	if (!paddc)
+		return -ENOMEM;
+
+	if (copy_from_user(paddc, user, len) != 0) {
+		ret = -EFAULT;
+		goto free;
+	}
+
+	t = arpt_find_table_lock(tmp.name, &ret, &arpt_mutex);
+	if (!t)
+		goto free;
+
+	write_lock_bh(&t->lock);
+	if (t->private->number != paddc->num_counters) {
+		ret = -EINVAL;
+		goto unlock_up_free;
+	}
+
+	i = 0;
+	ARPT_ENTRY_ITERATE(t->private->entries,
+			   t->private->size,
+			   add_counter_to_entry,
+			   paddc->counters,
+			   &i);
+ unlock_up_free:
+	write_unlock_bh(&t->lock);
+	up(&arpt_mutex);
+ free:
+	vfree(paddc);
+
+	return ret;
+}
+
+static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+{
+	int ret;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	switch (cmd) {
+	case ARPT_SO_SET_REPLACE:
+		ret = do_replace(user, len);
+		break;
+
+	case ARPT_SO_SET_ADD_COUNTERS:
+		ret = do_add_counters(user, len);
+		break;
+
+	default:
+		duprintf("do_arpt_set_ctl:  unknown request %i\n", cmd);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
+{
+	int ret;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	switch (cmd) {
+	case ARPT_SO_GET_INFO: {
+		char name[ARPT_TABLE_MAXNAMELEN];
+		struct arpt_table *t;
+
+		if (*len != sizeof(struct arpt_getinfo)) {
+			duprintf("length %u != %Zu\n", *len,
+				 sizeof(struct arpt_getinfo));
+			ret = -EINVAL;
+			break;
+		}
+
+		if (copy_from_user(name, user, sizeof(name)) != 0) {
+			ret = -EFAULT;
+			break;
+		}
+		name[ARPT_TABLE_MAXNAMELEN-1] = '\0';
+		t = arpt_find_table_lock(name, &ret, &arpt_mutex);
+		if (t) {
+			struct arpt_getinfo info;
+
+			info.valid_hooks = t->valid_hooks;
+			memcpy(info.hook_entry, t->private->hook_entry,
+			       sizeof(info.hook_entry));
+			memcpy(info.underflow, t->private->underflow,
+			       sizeof(info.underflow));
+			info.num_entries = t->private->number;
+			info.size = t->private->size;
+			strcpy(info.name, name);
+
+			if (copy_to_user(user, &info, *len) != 0)
+				ret = -EFAULT;
+			else
+				ret = 0;
+
+			up(&arpt_mutex);
+		}
+	}
+	break;
+
+	case ARPT_SO_GET_ENTRIES: {
+		struct arpt_get_entries get;
+
+		if (*len < sizeof(get)) {
+			duprintf("get_entries: %u < %Zu\n", *len, sizeof(get));
+			ret = -EINVAL;
+		} else if (copy_from_user(&get, user, sizeof(get)) != 0) {
+			ret = -EFAULT;
+		} else if (*len != sizeof(struct arpt_get_entries) + get.size) {
+			duprintf("get_entries: %u != %Zu\n", *len,
+				 sizeof(struct arpt_get_entries) + get.size);
+			ret = -EINVAL;
+		} else
+			ret = get_entries(&get, user);
+		break;
+	}
+
+	default:
+		duprintf("do_arpt_get_ctl: unknown request %i\n", cmd);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+/* Registration hooks for targets. */
+int arpt_register_target(struct arpt_target *target)
+{
+	int ret;
+
+	ret = down_interruptible(&arpt_mutex);
+	if (ret != 0)
+		return ret;
+
+	if (!list_named_insert(&arpt_target, target)) {
+		duprintf("arpt_register_target: `%s' already in list!\n",
+			 target->name);
+		ret = -EINVAL;
+	}
+	up(&arpt_mutex);
+	return ret;
+}
+
+void arpt_unregister_target(struct arpt_target *target)
+{
+	down(&arpt_mutex);
+	LIST_DELETE(&arpt_target, target);
+	up(&arpt_mutex);
+}
+
+int arpt_register_table(struct arpt_table *table,
+			const struct arpt_replace *repl)
+{
+	int ret;
+	struct arpt_table_info *newinfo;
+	static struct arpt_table_info bootstrap
+		= { 0, 0, 0, { 0 }, { 0 }, { } };
+
+	newinfo = vmalloc(sizeof(struct arpt_table_info)
+			  + SMP_ALIGN(repl->size) * num_possible_cpus());
+	if (!newinfo) {
+		ret = -ENOMEM;
+		return ret;
+	}
+	memcpy(newinfo->entries, repl->entries, repl->size);
+
+	ret = translate_table(table->name, table->valid_hooks,
+			      newinfo, repl->size,
+			      repl->num_entries,
+			      repl->hook_entry,
+			      repl->underflow);
+	duprintf("arpt_register_table: translate table gives %d\n", ret);
+	if (ret != 0) {
+		vfree(newinfo);
+		return ret;
+	}
+
+	ret = down_interruptible(&arpt_mutex);
+	if (ret != 0) {
+		vfree(newinfo);
+		return ret;
+	}
+
+	/* Don't autoload: we'd eat our tail... */
+	if (list_named_find(&arpt_tables, table->name)) {
+		ret = -EEXIST;
+		goto free_unlock;
+	}
+
+	/* Simplifies replace_table code. */
+	table->private = &bootstrap;
+	if (!replace_table(table, 0, newinfo, &ret))
+		goto free_unlock;
+
+	duprintf("table->private->number = %u\n",
+		 table->private->number);
+	
+	/* save number of initial entries */
+	table->private->initial_entries = table->private->number;
+
+	rwlock_init(&table->lock);
+	list_prepend(&arpt_tables, table);
+
+ unlock:
+	up(&arpt_mutex);
+	return ret;
+
+ free_unlock:
+	vfree(newinfo);
+	goto unlock;
+}
+
+void arpt_unregister_table(struct arpt_table *table)
+{
+	down(&arpt_mutex);
+	LIST_DELETE(&arpt_tables, table);
+	up(&arpt_mutex);
+
+	/* Decrease module usage counts and free resources */
+	ARPT_ENTRY_ITERATE(table->private->entries, table->private->size,
+			   cleanup_entry, NULL);
+	vfree(table->private);
+}
+
+/* The built-in targets: standard (NULL) and error. */
+static struct arpt_target arpt_standard_target = {
+	.name		= ARPT_STANDARD_TARGET,
+};
+
+static struct arpt_target arpt_error_target = {
+	.name		= ARPT_ERROR_TARGET,
+	.target		= arpt_error,
+};
+
+static struct nf_sockopt_ops arpt_sockopts = {
+	.pf		= PF_INET,
+	.set_optmin	= ARPT_BASE_CTL,
+	.set_optmax	= ARPT_SO_SET_MAX+1,
+	.set		= do_arpt_set_ctl,
+	.get_optmin	= ARPT_BASE_CTL,
+	.get_optmax	= ARPT_SO_GET_MAX+1,
+	.get		= do_arpt_get_ctl,
+};
+
+#ifdef CONFIG_PROC_FS
+static inline int print_name(const struct arpt_table *t,
+			     off_t start_offset, char *buffer, int length,
+			     off_t *pos, unsigned int *count)
+{
+	if ((*count)++ >= start_offset) {
+		unsigned int namelen;
+
+		namelen = sprintf(buffer + *pos, "%s\n", t->name);
+		if (*pos + namelen > length) {
+			/* Stop iterating */
+			return 1;
+		}
+		*pos += namelen;
+	}
+	return 0;
+}
+
+static int arpt_get_tables(char *buffer, char **start, off_t offset, int length)
+{
+	off_t pos = 0;
+	unsigned int count = 0;
+
+	if (down_interruptible(&arpt_mutex) != 0)
+		return 0;
+
+	LIST_FIND(&arpt_tables, print_name, struct arpt_table *,
+		  offset, buffer, length, &pos, &count);
+
+	up(&arpt_mutex);
+
+	/* `start' hack - see fs/proc/generic.c line ~105 */
+	*start=(char *)((unsigned long)count-offset);
+	return pos;
+}
+#endif /*CONFIG_PROC_FS*/
+
+static int __init init(void)
+{
+	int ret;
+
+	/* Noone else will be downing sem now, so we won't sleep */
+	down(&arpt_mutex);
+	list_append(&arpt_target, &arpt_standard_target);
+	list_append(&arpt_target, &arpt_error_target);
+	up(&arpt_mutex);
+
+	/* Register setsockopt */
+	ret = nf_register_sockopt(&arpt_sockopts);
+	if (ret < 0) {
+		duprintf("Unable to register sockopts.\n");
+		return ret;
+	}
+
+#ifdef CONFIG_PROC_FS
+	{
+		struct proc_dir_entry *proc;
+
+		proc = proc_net_create("arp_tables_names", 0, arpt_get_tables);
+		if (!proc) {
+			nf_unregister_sockopt(&arpt_sockopts);
+			return -ENOMEM;
+		}
+		proc->owner = THIS_MODULE;
+	}
+#endif
+
+	printk("arp_tables: (C) 2002 David S. Miller\n");
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	nf_unregister_sockopt(&arpt_sockopts);
+#ifdef CONFIG_PROC_FS
+	proc_net_remove("arp_tables_names");
+#endif
+}
+
+EXPORT_SYMBOL(arpt_register_table);
+EXPORT_SYMBOL(arpt_unregister_table);
+EXPORT_SYMBOL(arpt_do_table);
+EXPORT_SYMBOL(arpt_register_target);
+EXPORT_SYMBOL(arpt_unregister_target);
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/arpt_mangle.c b/net/ipv4/netfilter/arpt_mangle.c
new file mode 100644
index 000000000000..3e592ec86482
--- /dev/null
+++ b/net/ipv4/netfilter/arpt_mangle.c
@@ -0,0 +1,104 @@
+/* module that allows mangling of the arp payload */
+#include <linux/module.h>
+#include <linux/netfilter_arp/arpt_mangle.h>
+#include <net/sock.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
+MODULE_DESCRIPTION("arptables arp payload mangle target");
+
+static unsigned int
+target(struct sk_buff **pskb, unsigned int hooknum, const struct net_device *in,
+   const struct net_device *out, const void *targinfo, void *userinfo)
+{
+	const struct arpt_mangle *mangle = targinfo;
+	struct arphdr *arp;
+	unsigned char *arpptr;
+	int pln, hln;
+
+	if (skb_shared(*pskb) || skb_cloned(*pskb)) {
+		struct sk_buff *nskb;
+
+		nskb = skb_copy(*pskb, GFP_ATOMIC);
+		if (!nskb)
+			return NF_DROP;
+		if ((*pskb)->sk)
+			skb_set_owner_w(nskb, (*pskb)->sk);
+		kfree_skb(*pskb);
+		*pskb = nskb;
+	}
+
+	arp = (*pskb)->nh.arph;
+	arpptr = (*pskb)->nh.raw + sizeof(*arp);
+	pln = arp->ar_pln;
+	hln = arp->ar_hln;
+	/* We assume that pln and hln were checked in the match */
+	if (mangle->flags & ARPT_MANGLE_SDEV) {
+		if (ARPT_DEV_ADDR_LEN_MAX < hln ||
+		   (arpptr + hln > (**pskb).tail))
+			return NF_DROP;
+		memcpy(arpptr, mangle->src_devaddr, hln);
+	}
+	arpptr += hln;
+	if (mangle->flags & ARPT_MANGLE_SIP) {
+		if (ARPT_MANGLE_ADDR_LEN_MAX < pln ||
+		   (arpptr + pln > (**pskb).tail))
+			return NF_DROP;
+		memcpy(arpptr, &mangle->u_s.src_ip, pln);
+	}
+	arpptr += pln;
+	if (mangle->flags & ARPT_MANGLE_TDEV) {
+		if (ARPT_DEV_ADDR_LEN_MAX < hln ||
+		   (arpptr + hln > (**pskb).tail))
+			return NF_DROP;
+		memcpy(arpptr, mangle->tgt_devaddr, hln);
+	}
+	arpptr += hln;
+	if (mangle->flags & ARPT_MANGLE_TIP) {
+		if (ARPT_MANGLE_ADDR_LEN_MAX < pln ||
+		   (arpptr + pln > (**pskb).tail))
+			return NF_DROP;
+		memcpy(arpptr, &mangle->u_t.tgt_ip, pln);
+	}
+	return mangle->target;
+}
+
+static int
+checkentry(const char *tablename, const struct arpt_entry *e, void *targinfo,
+   unsigned int targinfosize, unsigned int hook_mask)
+{
+	const struct arpt_mangle *mangle = targinfo;
+
+	if (mangle->flags & ~ARPT_MANGLE_MASK ||
+	    !(mangle->flags & ARPT_MANGLE_MASK))
+		return 0;
+
+	if (mangle->target != NF_DROP && mangle->target != NF_ACCEPT &&
+	   mangle->target != ARPT_CONTINUE)
+		return 0;
+	return 1;
+}
+
+static struct arpt_target arpt_mangle_reg
+= {
+        .name		= "mangle",
+        .target		= target,
+        .checkentry	= checkentry,
+        .me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	if (arpt_register_target(&arpt_mangle_reg))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	arpt_unregister_target(&arpt_mangle_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/arptable_filter.c b/net/ipv4/netfilter/arptable_filter.c
new file mode 100644
index 000000000000..0d759f5a4ef0
--- /dev/null
+++ b/net/ipv4/netfilter/arptable_filter.c
@@ -0,0 +1,214 @@
+/*
+ * Filtering ARP tables module.
+ *
+ * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/netfilter_arp/arp_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
+MODULE_DESCRIPTION("arptables filter table");
+
+#define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) | (1 << NF_ARP_OUT) | \
+			   (1 << NF_ARP_FORWARD))
+
+/* Standard entry. */
+struct arpt_standard
+{
+	struct arpt_entry entry;
+	struct arpt_standard_target target;
+};
+
+struct arpt_error_target
+{
+	struct arpt_entry_target target;
+	char errorname[ARPT_FUNCTION_MAXNAMELEN];
+};
+
+struct arpt_error
+{
+	struct arpt_entry entry;
+	struct arpt_error_target target;
+};
+
+static struct
+{
+	struct arpt_replace repl;
+	struct arpt_standard entries[3];
+	struct arpt_error term;
+} initial_table __initdata
+= { { "filter", FILTER_VALID_HOOKS, 4,
+      sizeof(struct arpt_standard) * 3 + sizeof(struct arpt_error),
+      { [NF_ARP_IN] = 0,
+	[NF_ARP_OUT] = sizeof(struct arpt_standard),
+	[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard), },
+      { [NF_ARP_IN] = 0,
+	[NF_ARP_OUT] = sizeof(struct arpt_standard),
+	[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard), },
+      0, NULL, { } },
+    {
+	    /* ARP_IN */
+	    {
+		    {
+			    {
+				    { 0 }, { 0 }, { 0 }, { 0 },
+				    0, 0,
+				    { { 0, }, { 0, } },
+				    { { 0, }, { 0, } },
+				    0, 0,
+				    0, 0,
+				    0, 0,
+				    "", "", { 0 }, { 0 },
+				    0, 0
+			    },
+			    sizeof(struct arpt_entry),
+			    sizeof(struct arpt_standard),
+			    0,
+			    { 0, 0 }, { } },
+		    { { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
+		      -NF_ACCEPT - 1 }
+	    },
+	    /* ARP_OUT */
+	    {
+		    {
+			    {
+				    { 0 }, { 0 }, { 0 }, { 0 },
+				    0, 0,
+				    { { 0, }, { 0, } },
+				    { { 0, }, { 0, } },
+				    0, 0,
+				    0, 0,
+				    0, 0,
+				    "", "", { 0 }, { 0 },
+				    0, 0
+			    },
+			    sizeof(struct arpt_entry),
+			    sizeof(struct arpt_standard),
+			    0,
+			    { 0, 0 }, { } },
+		    { { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
+		      -NF_ACCEPT - 1 }
+	    },
+	    /* ARP_FORWARD */
+	    {
+		    {
+			    {
+				    { 0 }, { 0 }, { 0 }, { 0 },
+				    0, 0,
+				    { { 0, }, { 0, } },
+				    { { 0, }, { 0, } },
+				    0, 0,
+				    0, 0,
+				    0, 0,
+				    "", "", { 0 }, { 0 },
+				    0, 0
+			    },
+			    sizeof(struct arpt_entry),
+			    sizeof(struct arpt_standard),
+			    0,
+			    { 0, 0 }, { } },
+		    { { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
+		      -NF_ACCEPT - 1 }
+	    }
+    },
+    /* ERROR */
+    {
+	    {
+		    {
+			    { 0 }, { 0 }, { 0 }, { 0 },
+			    0, 0,
+			    { { 0, }, { 0, } },
+			    { { 0, }, { 0, } },
+			    0, 0,
+			    0, 0,
+			    0, 0,
+			    "", "", { 0 }, { 0 },
+			    0, 0
+		    },
+		    sizeof(struct arpt_entry),
+		    sizeof(struct arpt_error),
+		    0,
+		    { 0, 0 }, { } },
+	    { { { { ARPT_ALIGN(sizeof(struct arpt_error_target)), ARPT_ERROR_TARGET } },
+		{ } },
+	      "ERROR"
+	    }
+    }
+};
+
+static struct arpt_table packet_filter = {
+	.name		= "filter",
+	.valid_hooks	= FILTER_VALID_HOOKS,
+	.lock		= RW_LOCK_UNLOCKED,
+	.private	= NULL,
+	.me		= THIS_MODULE,
+};
+
+/* The work comes in here from netfilter.c */
+static unsigned int arpt_hook(unsigned int hook,
+			      struct sk_buff **pskb,
+			      const struct net_device *in,
+			      const struct net_device *out,
+			      int (*okfn)(struct sk_buff *))
+{
+	return arpt_do_table(pskb, hook, in, out, &packet_filter, NULL);
+}
+
+static struct nf_hook_ops arpt_ops[] = {
+	{
+		.hook		= arpt_hook,
+		.owner		= THIS_MODULE,
+		.pf		= NF_ARP,
+		.hooknum	= NF_ARP_IN,
+	},
+	{
+		.hook		= arpt_hook,
+		.owner		= THIS_MODULE,
+		.pf		= NF_ARP,
+		.hooknum	= NF_ARP_OUT,
+	},
+	{
+		.hook		= arpt_hook,
+		.owner		= THIS_MODULE,
+		.pf		= NF_ARP,
+		.hooknum	= NF_ARP_FORWARD,
+	},
+};
+
+static int __init init(void)
+{
+	int ret, i;
+
+	/* Register table */
+	ret = arpt_register_table(&packet_filter, &initial_table.repl);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(arpt_ops); i++)
+		if ((ret = nf_register_hook(&arpt_ops[i])) < 0)
+			goto cleanup_hooks;
+	return ret;
+
+cleanup_hooks:
+	while (--i >= 0)
+		nf_unregister_hook(&arpt_ops[i]);
+
+	arpt_unregister_table(&packet_filter);
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(arpt_ops); i++)
+		nf_unregister_hook(&arpt_ops[i]);
+
+	arpt_unregister_table(&packet_filter);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_conntrack_amanda.c b/net/ipv4/netfilter/ip_conntrack_amanda.c
new file mode 100644
index 000000000000..3dbddd062605
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_amanda.c
@@ -0,0 +1,167 @@
+/* Amanda extension for IP connection tracking, Version 0.2
+ * (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
+ * based on HW's ip_conntrack_irc.c as well as other modules
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *
+ *	Module load syntax:
+ * 	insmod ip_conntrack_amanda.o [master_timeout=n]
+ *	
+ *	Where master_timeout is the timeout (in seconds) of the master
+ *	connection (port 10080).  This defaults to 5 minutes but if
+ *	your clients take longer than 5 minutes to do their work
+ *	before getting back to the Amanda server, you can increase
+ *	this value.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <linux/moduleparam.h>
+#include <net/checksum.h>
+#include <net/udp.h>
+
+#include <linux/netfilter_ipv4/lockhelp.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
+
+static unsigned int master_timeout = 300;
+
+MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");
+MODULE_DESCRIPTION("Amanda connection tracking module");
+MODULE_LICENSE("GPL");
+module_param(master_timeout, int, 0600);
+MODULE_PARM_DESC(master_timeout, "timeout for the master connection");
+
+static char *conns[] = { "DATA ", "MESG ", "INDEX " };
+
+/* This is slow, but it's simple. --RR */
+static char amanda_buffer[65536];
+static DECLARE_LOCK(amanda_buffer_lock);
+
+unsigned int (*ip_nat_amanda_hook)(struct sk_buff **pskb,
+				   enum ip_conntrack_info ctinfo,
+				   unsigned int matchoff,
+				   unsigned int matchlen,
+				   struct ip_conntrack_expect *exp);
+EXPORT_SYMBOL_GPL(ip_nat_amanda_hook);
+
+static int help(struct sk_buff **pskb,
+                struct ip_conntrack *ct, enum ip_conntrack_info ctinfo)
+{
+	struct ip_conntrack_expect *exp;
+	char *data, *data_limit, *tmp;
+	unsigned int dataoff, i;
+	u_int16_t port, len;
+	int ret = NF_ACCEPT;
+
+	/* Only look at packets from the Amanda server */
+	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL)
+		return NF_ACCEPT;
+
+	/* increase the UDP timeout of the master connection as replies from
+	 * Amanda clients to the server can be quite delayed */
+	ip_ct_refresh_acct(ct, ctinfo, NULL, master_timeout * HZ);
+
+	/* No data? */
+	dataoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
+	if (dataoff >= (*pskb)->len) {
+		if (net_ratelimit())
+			printk("amanda_help: skblen = %u\n", (*pskb)->len);
+		return NF_ACCEPT;
+	}
+
+	LOCK_BH(&amanda_buffer_lock);
+	skb_copy_bits(*pskb, dataoff, amanda_buffer, (*pskb)->len - dataoff);
+	data = amanda_buffer;
+	data_limit = amanda_buffer + (*pskb)->len - dataoff;
+	*data_limit = '\0';
+
+	/* Search for the CONNECT string */
+	data = strstr(data, "CONNECT ");
+	if (!data)
+		goto out;
+	data += strlen("CONNECT ");
+
+	/* Only search first line. */	
+	if ((tmp = strchr(data, '\n')))
+		*tmp = '\0';
+
+	for (i = 0; i < ARRAY_SIZE(conns); i++) {
+		char *match = strstr(data, conns[i]);
+		if (!match)
+			continue;
+		tmp = data = match + strlen(conns[i]);
+		port = simple_strtoul(data, &data, 10);
+		len = data - tmp;
+		if (port == 0 || len > 5)
+			break;
+
+		exp = ip_conntrack_expect_alloc();
+		if (exp == NULL) {
+			ret = NF_DROP;
+			goto out;
+		}
+
+		exp->expectfn = NULL;
+		exp->master = ct;
+
+		exp->tuple.src.ip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
+		exp->tuple.src.u.tcp.port = 0;
+		exp->tuple.dst.ip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip;
+		exp->tuple.dst.protonum = IPPROTO_TCP;
+		exp->tuple.dst.u.tcp.port = htons(port);
+
+		exp->mask.src.ip = 0xFFFFFFFF;
+		exp->mask.src.u.tcp.port = 0;
+		exp->mask.dst.ip = 0xFFFFFFFF;
+		exp->mask.dst.protonum = 0xFF;
+		exp->mask.dst.u.tcp.port = 0xFFFF;
+
+		if (ip_nat_amanda_hook)
+			ret = ip_nat_amanda_hook(pskb, ctinfo,
+						 tmp - amanda_buffer,
+						 len, exp);
+		else if (ip_conntrack_expect_related(exp) != 0) {
+			ip_conntrack_expect_free(exp);
+			ret = NF_DROP;
+		}
+	}
+
+out:
+	UNLOCK_BH(&amanda_buffer_lock);
+	return ret;
+}
+
+static struct ip_conntrack_helper amanda_helper = {
+	.max_expected = ARRAY_SIZE(conns),
+	.timeout = 180,
+	.me = THIS_MODULE,
+	.help = help,
+	.name = "amanda",
+
+	.tuple = { .src = { .u = { __constant_htons(10080) } },
+		   .dst = { .protonum = IPPROTO_UDP },
+	},
+	.mask = { .src = { .u = { 0xFFFF } },
+		 .dst = { .protonum = 0xFF },
+	},
+};
+
+static void __exit fini(void)
+{
+	ip_conntrack_helper_unregister(&amanda_helper);
+}
+
+static int __init init(void)
+{
+	return ip_conntrack_helper_register(&amanda_helper);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_conntrack_core.c b/net/ipv4/netfilter/ip_conntrack_core.c
new file mode 100644
index 000000000000..28d9425d5c39
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_core.c
@@ -0,0 +1,1247 @@
+/* Connection state tracking for netfilter.  This is separated from,
+   but required by, the NAT layer; it can also be used by an iptables
+   extension. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell  
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 23 Apr 2001: Harald Welte <laforge@gnumonks.org>
+ * 	- new API and handling of conntrack/nat helpers
+ * 	- now capable of multiple expectations for one master
+ * 16 Jul 2002: Harald Welte <laforge@gnumonks.org>
+ * 	- add usage/reference counts to ip_conntrack_expect
+ *	- export ip_conntrack[_expect]_{find_get,put} functions
+ * */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/icmp.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <linux/vmalloc.h>
+#include <net/checksum.h>
+#include <net/ip.h>
+#include <linux/stddef.h>
+#include <linux/sysctl.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/jhash.h>
+#include <linux/err.h>
+#include <linux/percpu.h>
+#include <linux/moduleparam.h>
+
+/* This rwlock protects the main hash table, protocol/helper/expected
+   registrations, conntrack timers*/
+#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_conntrack_lock)
+#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_conntrack_lock)
+
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#define IP_CONNTRACK_VERSION	"2.1"
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+DECLARE_RWLOCK(ip_conntrack_lock);
+
+/* ip_conntrack_standalone needs this */
+atomic_t ip_conntrack_count = ATOMIC_INIT(0);
+
+void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack) = NULL;
+LIST_HEAD(ip_conntrack_expect_list);
+struct ip_conntrack_protocol *ip_ct_protos[MAX_IP_CT_PROTO];
+static LIST_HEAD(helpers);
+unsigned int ip_conntrack_htable_size = 0;
+int ip_conntrack_max;
+struct list_head *ip_conntrack_hash;
+static kmem_cache_t *ip_conntrack_cachep;
+static kmem_cache_t *ip_conntrack_expect_cachep;
+struct ip_conntrack ip_conntrack_untracked;
+unsigned int ip_ct_log_invalid;
+static LIST_HEAD(unconfirmed);
+static int ip_conntrack_vmalloc;
+
+DEFINE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
+
+void 
+ip_conntrack_put(struct ip_conntrack *ct)
+{
+	IP_NF_ASSERT(ct);
+	nf_conntrack_put(&ct->ct_general);
+}
+
+static int ip_conntrack_hash_rnd_initted;
+static unsigned int ip_conntrack_hash_rnd;
+
+static u_int32_t
+hash_conntrack(const struct ip_conntrack_tuple *tuple)
+{
+#if 0
+	dump_tuple(tuple);
+#endif
+	return (jhash_3words(tuple->src.ip,
+	                     (tuple->dst.ip ^ tuple->dst.protonum),
+	                     (tuple->src.u.all | (tuple->dst.u.all << 16)),
+	                     ip_conntrack_hash_rnd) % ip_conntrack_htable_size);
+}
+
+int
+ip_ct_get_tuple(const struct iphdr *iph,
+		const struct sk_buff *skb,
+		unsigned int dataoff,
+		struct ip_conntrack_tuple *tuple,
+		const struct ip_conntrack_protocol *protocol)
+{
+	/* Never happen */
+	if (iph->frag_off & htons(IP_OFFSET)) {
+		printk("ip_conntrack_core: Frag of proto %u.\n",
+		       iph->protocol);
+		return 0;
+	}
+
+	tuple->src.ip = iph->saddr;
+	tuple->dst.ip = iph->daddr;
+	tuple->dst.protonum = iph->protocol;
+	tuple->dst.dir = IP_CT_DIR_ORIGINAL;
+
+	return protocol->pkt_to_tuple(skb, dataoff, tuple);
+}
+
+int
+ip_ct_invert_tuple(struct ip_conntrack_tuple *inverse,
+		   const struct ip_conntrack_tuple *orig,
+		   const struct ip_conntrack_protocol *protocol)
+{
+	inverse->src.ip = orig->dst.ip;
+	inverse->dst.ip = orig->src.ip;
+	inverse->dst.protonum = orig->dst.protonum;
+	inverse->dst.dir = !orig->dst.dir;
+
+	return protocol->invert_tuple(inverse, orig);
+}
+
+
+/* ip_conntrack_expect helper functions */
+static void destroy_expect(struct ip_conntrack_expect *exp)
+{
+	ip_conntrack_put(exp->master);
+	IP_NF_ASSERT(!timer_pending(&exp->timeout));
+	kmem_cache_free(ip_conntrack_expect_cachep, exp);
+	CONNTRACK_STAT_INC(expect_delete);
+}
+
+static void unlink_expect(struct ip_conntrack_expect *exp)
+{
+	MUST_BE_WRITE_LOCKED(&ip_conntrack_lock);
+	list_del(&exp->list);
+	/* Logically in destroy_expect, but we hold the lock here. */
+	exp->master->expecting--;
+}
+
+static void expectation_timed_out(unsigned long ul_expect)
+{
+	struct ip_conntrack_expect *exp = (void *)ul_expect;
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	unlink_expect(exp);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+	destroy_expect(exp);
+}
+
+/* If an expectation for this connection is found, it gets delete from
+ * global list then returned. */
+static struct ip_conntrack_expect *
+find_expectation(const struct ip_conntrack_tuple *tuple)
+{
+	struct ip_conntrack_expect *i;
+
+	list_for_each_entry(i, &ip_conntrack_expect_list, list) {
+		/* If master is not in hash table yet (ie. packet hasn't left
+		   this machine yet), how can other end know about expected?
+		   Hence these are not the droids you are looking for (if
+		   master ct never got confirmed, we'd hold a reference to it
+		   and weird things would happen to future packets). */
+		if (ip_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)
+		    && is_confirmed(i->master)
+		    && del_timer(&i->timeout)) {
+			unlink_expect(i);
+			return i;
+		}
+	}
+	return NULL;
+}
+
+/* delete all expectations for this conntrack */
+static void remove_expectations(struct ip_conntrack *ct)
+{
+	struct ip_conntrack_expect *i, *tmp;
+
+	/* Optimization: most connection never expect any others. */
+	if (ct->expecting == 0)
+		return;
+
+	list_for_each_entry_safe(i, tmp, &ip_conntrack_expect_list, list) {
+		if (i->master == ct && del_timer(&i->timeout)) {
+			unlink_expect(i);
+			destroy_expect(i);
+		}
+	}
+}
+
+static void
+clean_from_lists(struct ip_conntrack *ct)
+{
+	unsigned int ho, hr;
+	
+	DEBUGP("clean_from_lists(%p)\n", ct);
+	MUST_BE_WRITE_LOCKED(&ip_conntrack_lock);
+
+	ho = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+	hr = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+	LIST_DELETE(&ip_conntrack_hash[ho], &ct->tuplehash[IP_CT_DIR_ORIGINAL]);
+	LIST_DELETE(&ip_conntrack_hash[hr], &ct->tuplehash[IP_CT_DIR_REPLY]);
+
+	/* Destroy all pending expectations */
+	remove_expectations(ct);
+}
+
+static void
+destroy_conntrack(struct nf_conntrack *nfct)
+{
+	struct ip_conntrack *ct = (struct ip_conntrack *)nfct;
+	struct ip_conntrack_protocol *proto;
+
+	DEBUGP("destroy_conntrack(%p)\n", ct);
+	IP_NF_ASSERT(atomic_read(&nfct->use) == 0);
+	IP_NF_ASSERT(!timer_pending(&ct->timeout));
+
+	/* To make sure we don't get any weird locking issues here:
+	 * destroy_conntrack() MUST NOT be called with a write lock
+	 * to ip_conntrack_lock!!! -HW */
+	proto = ip_ct_find_proto(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
+	if (proto && proto->destroy)
+		proto->destroy(ct);
+
+	if (ip_conntrack_destroyed)
+		ip_conntrack_destroyed(ct);
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* Expectations will have been removed in clean_from_lists,
+	 * except TFTP can create an expectation on the first packet,
+	 * before connection is in the list, so we need to clean here,
+	 * too. */
+	remove_expectations(ct);
+
+	/* We overload first tuple to link into unconfirmed list. */
+	if (!is_confirmed(ct)) {
+		BUG_ON(list_empty(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list));
+		list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
+	}
+
+	CONNTRACK_STAT_INC(delete);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	if (ct->master)
+		ip_conntrack_put(ct->master);
+
+	DEBUGP("destroy_conntrack: returning ct=%p to slab\n", ct);
+	kmem_cache_free(ip_conntrack_cachep, ct);
+	atomic_dec(&ip_conntrack_count);
+}
+
+static void death_by_timeout(unsigned long ul_conntrack)
+{
+	struct ip_conntrack *ct = (void *)ul_conntrack;
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* Inside lock so preempt is disabled on module removal path.
+	 * Otherwise we can get spurious warnings. */
+	CONNTRACK_STAT_INC(delete_list);
+	clean_from_lists(ct);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+	ip_conntrack_put(ct);
+}
+
+static inline int
+conntrack_tuple_cmp(const struct ip_conntrack_tuple_hash *i,
+		    const struct ip_conntrack_tuple *tuple,
+		    const struct ip_conntrack *ignored_conntrack)
+{
+	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+	return tuplehash_to_ctrack(i) != ignored_conntrack
+		&& ip_ct_tuple_equal(tuple, &i->tuple);
+}
+
+static struct ip_conntrack_tuple_hash *
+__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
+		    const struct ip_conntrack *ignored_conntrack)
+{
+	struct ip_conntrack_tuple_hash *h;
+	unsigned int hash = hash_conntrack(tuple);
+
+	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+	list_for_each_entry(h, &ip_conntrack_hash[hash], list) {
+		if (conntrack_tuple_cmp(h, tuple, ignored_conntrack)) {
+			CONNTRACK_STAT_INC(found);
+			return h;
+		}
+		CONNTRACK_STAT_INC(searched);
+	}
+
+	return NULL;
+}
+
+/* Find a connection corresponding to a tuple. */
+struct ip_conntrack_tuple_hash *
+ip_conntrack_find_get(const struct ip_conntrack_tuple *tuple,
+		      const struct ip_conntrack *ignored_conntrack)
+{
+	struct ip_conntrack_tuple_hash *h;
+
+	READ_LOCK(&ip_conntrack_lock);
+	h = __ip_conntrack_find(tuple, ignored_conntrack);
+	if (h)
+		atomic_inc(&tuplehash_to_ctrack(h)->ct_general.use);
+	READ_UNLOCK(&ip_conntrack_lock);
+
+	return h;
+}
+
+/* Confirm a connection given skb; places it in hash table */
+int
+__ip_conntrack_confirm(struct sk_buff **pskb)
+{
+	unsigned int hash, repl_hash;
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+
+	ct = ip_conntrack_get(*pskb, &ctinfo);
+
+	/* ipt_REJECT uses ip_conntrack_attach to attach related
+	   ICMP/TCP RST packets in other direction.  Actual packet
+	   which created connection will be IP_CT_NEW or for an
+	   expected connection, IP_CT_RELATED. */
+	if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
+		return NF_ACCEPT;
+
+	hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+	repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+	/* We're not in hash table, and we refuse to set up related
+	   connections for unconfirmed conns.  But packet copies and
+	   REJECT will give spurious warnings here. */
+	/* IP_NF_ASSERT(atomic_read(&ct->ct_general.use) == 1); */
+
+	/* No external references means noone else could have
+           confirmed us. */
+	IP_NF_ASSERT(!is_confirmed(ct));
+	DEBUGP("Confirming conntrack %p\n", ct);
+
+	WRITE_LOCK(&ip_conntrack_lock);
+
+	/* See if there's one in the list already, including reverse:
+           NAT could have grabbed it without realizing, since we're
+           not in the hash.  If there is, we lost race. */
+	if (!LIST_FIND(&ip_conntrack_hash[hash],
+		       conntrack_tuple_cmp,
+		       struct ip_conntrack_tuple_hash *,
+		       &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, NULL)
+	    && !LIST_FIND(&ip_conntrack_hash[repl_hash],
+			  conntrack_tuple_cmp,
+			  struct ip_conntrack_tuple_hash *,
+			  &ct->tuplehash[IP_CT_DIR_REPLY].tuple, NULL)) {
+		/* Remove from unconfirmed list */
+		list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
+
+		list_prepend(&ip_conntrack_hash[hash],
+			     &ct->tuplehash[IP_CT_DIR_ORIGINAL]);
+		list_prepend(&ip_conntrack_hash[repl_hash],
+			     &ct->tuplehash[IP_CT_DIR_REPLY]);
+		/* Timer relative to confirmation time, not original
+		   setting time, otherwise we'd get timer wrap in
+		   weird delay cases. */
+		ct->timeout.expires += jiffies;
+		add_timer(&ct->timeout);
+		atomic_inc(&ct->ct_general.use);
+		set_bit(IPS_CONFIRMED_BIT, &ct->status);
+		CONNTRACK_STAT_INC(insert);
+		WRITE_UNLOCK(&ip_conntrack_lock);
+		return NF_ACCEPT;
+	}
+
+	CONNTRACK_STAT_INC(insert_failed);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	return NF_DROP;
+}
+
+/* Returns true if a connection correspondings to the tuple (required
+   for NAT). */
+int
+ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
+			 const struct ip_conntrack *ignored_conntrack)
+{
+	struct ip_conntrack_tuple_hash *h;
+
+	READ_LOCK(&ip_conntrack_lock);
+	h = __ip_conntrack_find(tuple, ignored_conntrack);
+	READ_UNLOCK(&ip_conntrack_lock);
+
+	return h != NULL;
+}
+
+/* There's a small race here where we may free a just-assured
+   connection.  Too bad: we're in trouble anyway. */
+static inline int unreplied(const struct ip_conntrack_tuple_hash *i)
+{
+	return !(test_bit(IPS_ASSURED_BIT, &tuplehash_to_ctrack(i)->status));
+}
+
+static int early_drop(struct list_head *chain)
+{
+	/* Traverse backwards: gives us oldest, which is roughly LRU */
+	struct ip_conntrack_tuple_hash *h;
+	struct ip_conntrack *ct = NULL;
+	int dropped = 0;
+
+	READ_LOCK(&ip_conntrack_lock);
+	h = LIST_FIND_B(chain, unreplied, struct ip_conntrack_tuple_hash *);
+	if (h) {
+		ct = tuplehash_to_ctrack(h);
+		atomic_inc(&ct->ct_general.use);
+	}
+	READ_UNLOCK(&ip_conntrack_lock);
+
+	if (!ct)
+		return dropped;
+
+	if (del_timer(&ct->timeout)) {
+		death_by_timeout((unsigned long)ct);
+		dropped = 1;
+		CONNTRACK_STAT_INC(early_drop);
+	}
+	ip_conntrack_put(ct);
+	return dropped;
+}
+
+static inline int helper_cmp(const struct ip_conntrack_helper *i,
+			     const struct ip_conntrack_tuple *rtuple)
+{
+	return ip_ct_tuple_mask_cmp(rtuple, &i->tuple, &i->mask);
+}
+
+static struct ip_conntrack_helper *ip_ct_find_helper(const struct ip_conntrack_tuple *tuple)
+{
+	return LIST_FIND(&helpers, helper_cmp,
+			 struct ip_conntrack_helper *,
+			 tuple);
+}
+
+/* Allocate a new conntrack: we return -ENOMEM if classification
+   failed due to stress.  Otherwise it really is unclassifiable. */
+static struct ip_conntrack_tuple_hash *
+init_conntrack(const struct ip_conntrack_tuple *tuple,
+	       struct ip_conntrack_protocol *protocol,
+	       struct sk_buff *skb)
+{
+	struct ip_conntrack *conntrack;
+	struct ip_conntrack_tuple repl_tuple;
+	size_t hash;
+	struct ip_conntrack_expect *exp;
+
+	if (!ip_conntrack_hash_rnd_initted) {
+		get_random_bytes(&ip_conntrack_hash_rnd, 4);
+		ip_conntrack_hash_rnd_initted = 1;
+	}
+
+	hash = hash_conntrack(tuple);
+
+	if (ip_conntrack_max
+	    && atomic_read(&ip_conntrack_count) >= ip_conntrack_max) {
+		/* Try dropping from this hash chain. */
+		if (!early_drop(&ip_conntrack_hash[hash])) {
+			if (net_ratelimit())
+				printk(KERN_WARNING
+				       "ip_conntrack: table full, dropping"
+				       " packet.\n");
+			return ERR_PTR(-ENOMEM);
+		}
+	}
+
+	if (!ip_ct_invert_tuple(&repl_tuple, tuple, protocol)) {
+		DEBUGP("Can't invert tuple.\n");
+		return NULL;
+	}
+
+	conntrack = kmem_cache_alloc(ip_conntrack_cachep, GFP_ATOMIC);
+	if (!conntrack) {
+		DEBUGP("Can't allocate conntrack.\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	memset(conntrack, 0, sizeof(*conntrack));
+	atomic_set(&conntrack->ct_general.use, 1);
+	conntrack->ct_general.destroy = destroy_conntrack;
+	conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *tuple;
+	conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = repl_tuple;
+	if (!protocol->new(conntrack, skb)) {
+		kmem_cache_free(ip_conntrack_cachep, conntrack);
+		return NULL;
+	}
+	/* Don't set timer yet: wait for confirmation */
+	init_timer(&conntrack->timeout);
+	conntrack->timeout.data = (unsigned long)conntrack;
+	conntrack->timeout.function = death_by_timeout;
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	exp = find_expectation(tuple);
+
+	if (exp) {
+		DEBUGP("conntrack: expectation arrives ct=%p exp=%p\n",
+			conntrack, exp);
+		/* Welcome, Mr. Bond.  We've been expecting you... */
+		__set_bit(IPS_EXPECTED_BIT, &conntrack->status);
+		conntrack->master = exp->master;
+#if CONFIG_IP_NF_CONNTRACK_MARK
+		conntrack->mark = exp->master->mark;
+#endif
+		nf_conntrack_get(&conntrack->master->ct_general);
+		CONNTRACK_STAT_INC(expect_new);
+	} else {
+		conntrack->helper = ip_ct_find_helper(&repl_tuple);
+
+		CONNTRACK_STAT_INC(new);
+	}
+
+	/* Overload tuple linked list to put us in unconfirmed list. */
+	list_add(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].list, &unconfirmed);
+
+	atomic_inc(&ip_conntrack_count);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	if (exp) {
+		if (exp->expectfn)
+			exp->expectfn(conntrack, exp);
+		destroy_expect(exp);
+	}
+
+	return &conntrack->tuplehash[IP_CT_DIR_ORIGINAL];
+}
+
+/* On success, returns conntrack ptr, sets skb->nfct and ctinfo */
+static inline struct ip_conntrack *
+resolve_normal_ct(struct sk_buff *skb,
+		  struct ip_conntrack_protocol *proto,
+		  int *set_reply,
+		  unsigned int hooknum,
+		  enum ip_conntrack_info *ctinfo)
+{
+	struct ip_conntrack_tuple tuple;
+	struct ip_conntrack_tuple_hash *h;
+	struct ip_conntrack *ct;
+
+	IP_NF_ASSERT((skb->nh.iph->frag_off & htons(IP_OFFSET)) == 0);
+
+	if (!ip_ct_get_tuple(skb->nh.iph, skb, skb->nh.iph->ihl*4, 
+				&tuple,proto))
+		return NULL;
+
+	/* look for tuple match */
+	h = ip_conntrack_find_get(&tuple, NULL);
+	if (!h) {
+		h = init_conntrack(&tuple, proto, skb);
+		if (!h)
+			return NULL;
+		if (IS_ERR(h))
+			return (void *)h;
+	}
+	ct = tuplehash_to_ctrack(h);
+
+	/* It exists; we have (non-exclusive) reference. */
+	if (DIRECTION(h) == IP_CT_DIR_REPLY) {
+		*ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY;
+		/* Please set reply bit if this packet OK */
+		*set_reply = 1;
+	} else {
+		/* Once we've had two way comms, always ESTABLISHED. */
+		if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
+			DEBUGP("ip_conntrack_in: normal packet for %p\n",
+			       ct);
+		        *ctinfo = IP_CT_ESTABLISHED;
+		} else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) {
+			DEBUGP("ip_conntrack_in: related packet for %p\n",
+			       ct);
+			*ctinfo = IP_CT_RELATED;
+		} else {
+			DEBUGP("ip_conntrack_in: new packet for %p\n",
+			       ct);
+			*ctinfo = IP_CT_NEW;
+		}
+		*set_reply = 0;
+	}
+	skb->nfct = &ct->ct_general;
+	skb->nfctinfo = *ctinfo;
+	return ct;
+}
+
+/* Netfilter hook itself. */
+unsigned int ip_conntrack_in(unsigned int hooknum,
+			     struct sk_buff **pskb,
+			     const struct net_device *in,
+			     const struct net_device *out,
+			     int (*okfn)(struct sk_buff *))
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	struct ip_conntrack_protocol *proto;
+	int set_reply;
+	int ret;
+
+	/* Previously seen (loopback or untracked)?  Ignore. */
+	if ((*pskb)->nfct) {
+		CONNTRACK_STAT_INC(ignore);
+		return NF_ACCEPT;
+	}
+
+	/* Never happen */
+	if ((*pskb)->nh.iph->frag_off & htons(IP_OFFSET)) {
+		if (net_ratelimit()) {
+		printk(KERN_ERR "ip_conntrack_in: Frag of proto %u (hook=%u)\n",
+		       (*pskb)->nh.iph->protocol, hooknum);
+		}
+		return NF_DROP;
+	}
+
+	/* FIXME: Do this right please. --RR */
+	(*pskb)->nfcache |= NFC_UNKNOWN;
+
+/* Doesn't cover locally-generated broadcast, so not worth it. */
+#if 0
+	/* Ignore broadcast: no `connection'. */
+	if ((*pskb)->pkt_type == PACKET_BROADCAST) {
+		printk("Broadcast packet!\n");
+		return NF_ACCEPT;
+	} else if (((*pskb)->nh.iph->daddr & htonl(0x000000FF)) 
+		   == htonl(0x000000FF)) {
+		printk("Should bcast: %u.%u.%u.%u->%u.%u.%u.%u (sk=%p, ptype=%u)\n",
+		       NIPQUAD((*pskb)->nh.iph->saddr),
+		       NIPQUAD((*pskb)->nh.iph->daddr),
+		       (*pskb)->sk, (*pskb)->pkt_type);
+	}
+#endif
+
+	proto = ip_ct_find_proto((*pskb)->nh.iph->protocol);
+
+	/* It may be an special packet, error, unclean...
+	 * inverse of the return code tells to the netfilter
+	 * core what to do with the packet. */
+	if (proto->error != NULL 
+	    && (ret = proto->error(*pskb, &ctinfo, hooknum)) <= 0) {
+		CONNTRACK_STAT_INC(error);
+		CONNTRACK_STAT_INC(invalid);
+		return -ret;
+	}
+
+	if (!(ct = resolve_normal_ct(*pskb, proto,&set_reply,hooknum,&ctinfo))) {
+		/* Not valid part of a connection */
+		CONNTRACK_STAT_INC(invalid);
+		return NF_ACCEPT;
+	}
+
+	if (IS_ERR(ct)) {
+		/* Too stressed to deal. */
+		CONNTRACK_STAT_INC(drop);
+		return NF_DROP;
+	}
+
+	IP_NF_ASSERT((*pskb)->nfct);
+
+	ret = proto->packet(ct, *pskb, ctinfo);
+	if (ret < 0) {
+		/* Invalid: inverse of the return code tells
+		 * the netfilter core what to do*/
+		nf_conntrack_put((*pskb)->nfct);
+		(*pskb)->nfct = NULL;
+		CONNTRACK_STAT_INC(invalid);
+		return -ret;
+	}
+
+	if (set_reply)
+		set_bit(IPS_SEEN_REPLY_BIT, &ct->status);
+
+	return ret;
+}
+
+int invert_tuplepr(struct ip_conntrack_tuple *inverse,
+		   const struct ip_conntrack_tuple *orig)
+{
+	return ip_ct_invert_tuple(inverse, orig, 
+				  ip_ct_find_proto(orig->dst.protonum));
+}
+
+/* Would two expected things clash? */
+static inline int expect_clash(const struct ip_conntrack_expect *a,
+			       const struct ip_conntrack_expect *b)
+{
+	/* Part covered by intersection of masks must be unequal,
+           otherwise they clash */
+	struct ip_conntrack_tuple intersect_mask
+		= { { a->mask.src.ip & b->mask.src.ip,
+		      { a->mask.src.u.all & b->mask.src.u.all } },
+		    { a->mask.dst.ip & b->mask.dst.ip,
+		      { a->mask.dst.u.all & b->mask.dst.u.all },
+		      a->mask.dst.protonum & b->mask.dst.protonum } };
+
+	return ip_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask);
+}
+
+static inline int expect_matches(const struct ip_conntrack_expect *a,
+				 const struct ip_conntrack_expect *b)
+{
+	return a->master == b->master
+		&& ip_ct_tuple_equal(&a->tuple, &b->tuple)
+		&& ip_ct_tuple_equal(&a->mask, &b->mask);
+}
+
+/* Generally a bad idea to call this: could have matched already. */
+void ip_conntrack_unexpect_related(struct ip_conntrack_expect *exp)
+{
+	struct ip_conntrack_expect *i;
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* choose the the oldest expectation to evict */
+	list_for_each_entry_reverse(i, &ip_conntrack_expect_list, list) {
+		if (expect_matches(i, exp) && del_timer(&i->timeout)) {
+			unlink_expect(i);
+			WRITE_UNLOCK(&ip_conntrack_lock);
+			destroy_expect(i);
+			return;
+		}
+	}
+	WRITE_UNLOCK(&ip_conntrack_lock);
+}
+
+struct ip_conntrack_expect *ip_conntrack_expect_alloc(void)
+{
+	struct ip_conntrack_expect *new;
+
+	new = kmem_cache_alloc(ip_conntrack_expect_cachep, GFP_ATOMIC);
+	if (!new) {
+		DEBUGP("expect_related: OOM allocating expect\n");
+		return NULL;
+	}
+	new->master = NULL;
+	return new;
+}
+
+void ip_conntrack_expect_free(struct ip_conntrack_expect *expect)
+{
+	kmem_cache_free(ip_conntrack_expect_cachep, expect);
+}
+
+static void ip_conntrack_expect_insert(struct ip_conntrack_expect *exp)
+{
+	atomic_inc(&exp->master->ct_general.use);
+	exp->master->expecting++;
+	list_add(&exp->list, &ip_conntrack_expect_list);
+
+	if (exp->master->helper->timeout) {
+		init_timer(&exp->timeout);
+		exp->timeout.data = (unsigned long)exp;
+		exp->timeout.function = expectation_timed_out;
+		exp->timeout.expires
+			= jiffies + exp->master->helper->timeout * HZ;
+		add_timer(&exp->timeout);
+	} else
+		exp->timeout.function = NULL;
+
+	CONNTRACK_STAT_INC(expect_create);
+}
+
+/* Race with expectations being used means we could have none to find; OK. */
+static void evict_oldest_expect(struct ip_conntrack *master)
+{
+	struct ip_conntrack_expect *i;
+
+	list_for_each_entry_reverse(i, &ip_conntrack_expect_list, list) {
+		if (i->master == master) {
+			if (del_timer(&i->timeout)) {
+				unlink_expect(i);
+				destroy_expect(i);
+			}
+			break;
+		}
+	}
+}
+
+static inline int refresh_timer(struct ip_conntrack_expect *i)
+{
+	if (!del_timer(&i->timeout))
+		return 0;
+
+	i->timeout.expires = jiffies + i->master->helper->timeout*HZ;
+	add_timer(&i->timeout);
+	return 1;
+}
+
+int ip_conntrack_expect_related(struct ip_conntrack_expect *expect)
+{
+	struct ip_conntrack_expect *i;
+	int ret;
+
+	DEBUGP("ip_conntrack_expect_related %p\n", related_to);
+	DEBUGP("tuple: "); DUMP_TUPLE(&expect->tuple);
+	DEBUGP("mask:  "); DUMP_TUPLE(&expect->mask);
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	list_for_each_entry(i, &ip_conntrack_expect_list, list) {
+		if (expect_matches(i, expect)) {
+			/* Refresh timer: if it's dying, ignore.. */
+			if (refresh_timer(i)) {
+				ret = 0;
+				/* We don't need the one they've given us. */
+				ip_conntrack_expect_free(expect);
+				goto out;
+			}
+		} else if (expect_clash(i, expect)) {
+			ret = -EBUSY;
+			goto out;
+		}
+	}
+
+	/* Will be over limit? */
+	if (expect->master->helper->max_expected && 
+	    expect->master->expecting >= expect->master->helper->max_expected)
+		evict_oldest_expect(expect->master);
+
+	ip_conntrack_expect_insert(expect);
+	ret = 0;
+out:
+	WRITE_UNLOCK(&ip_conntrack_lock);
+ 	return ret;
+}
+
+/* Alter reply tuple (maybe alter helper).  This is for NAT, and is
+   implicitly racy: see __ip_conntrack_confirm */
+void ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
+			      const struct ip_conntrack_tuple *newreply)
+{
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* Should be unconfirmed, so not in hash table yet */
+	IP_NF_ASSERT(!is_confirmed(conntrack));
+
+	DEBUGP("Altering reply tuple of %p to ", conntrack);
+	DUMP_TUPLE(newreply);
+
+	conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
+	if (!conntrack->master && conntrack->expecting == 0)
+		conntrack->helper = ip_ct_find_helper(newreply);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+}
+
+int ip_conntrack_helper_register(struct ip_conntrack_helper *me)
+{
+	BUG_ON(me->timeout == 0);
+	WRITE_LOCK(&ip_conntrack_lock);
+	list_prepend(&helpers, me);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	return 0;
+}
+
+static inline int unhelp(struct ip_conntrack_tuple_hash *i,
+			 const struct ip_conntrack_helper *me)
+{
+	if (tuplehash_to_ctrack(i)->helper == me)
+		tuplehash_to_ctrack(i)->helper = NULL;
+	return 0;
+}
+
+void ip_conntrack_helper_unregister(struct ip_conntrack_helper *me)
+{
+	unsigned int i;
+	struct ip_conntrack_expect *exp, *tmp;
+
+	/* Need write lock here, to delete helper. */
+	WRITE_LOCK(&ip_conntrack_lock);
+	LIST_DELETE(&helpers, me);
+
+	/* Get rid of expectations */
+	list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list, list) {
+		if (exp->master->helper == me && del_timer(&exp->timeout)) {
+			unlink_expect(exp);
+			destroy_expect(exp);
+		}
+	}
+	/* Get rid of expecteds, set helpers to NULL. */
+	LIST_FIND_W(&unconfirmed, unhelp, struct ip_conntrack_tuple_hash*, me);
+	for (i = 0; i < ip_conntrack_htable_size; i++)
+		LIST_FIND_W(&ip_conntrack_hash[i], unhelp,
+			    struct ip_conntrack_tuple_hash *, me);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	/* Someone could be still looking at the helper in a bh. */
+	synchronize_net();
+}
+
+static inline void ct_add_counters(struct ip_conntrack *ct,
+				   enum ip_conntrack_info ctinfo,
+				   const struct sk_buff *skb)
+{
+#ifdef CONFIG_IP_NF_CT_ACCT
+	if (skb) {
+		ct->counters[CTINFO2DIR(ctinfo)].packets++;
+		ct->counters[CTINFO2DIR(ctinfo)].bytes += 
+					ntohs(skb->nh.iph->tot_len);
+	}
+#endif
+}
+
+/* Refresh conntrack for this many jiffies and do accounting (if skb != NULL) */
+void ip_ct_refresh_acct(struct ip_conntrack *ct, 
+		        enum ip_conntrack_info ctinfo,
+			const struct sk_buff *skb,
+			unsigned long extra_jiffies)
+{
+	IP_NF_ASSERT(ct->timeout.data == (unsigned long)ct);
+
+	/* If not in hash table, timer will not be active yet */
+	if (!is_confirmed(ct)) {
+		ct->timeout.expires = extra_jiffies;
+		ct_add_counters(ct, ctinfo, skb);
+	} else {
+		WRITE_LOCK(&ip_conntrack_lock);
+		/* Need del_timer for race avoidance (may already be dying). */
+		if (del_timer(&ct->timeout)) {
+			ct->timeout.expires = jiffies + extra_jiffies;
+			add_timer(&ct->timeout);
+		}
+		ct_add_counters(ct, ctinfo, skb);
+		WRITE_UNLOCK(&ip_conntrack_lock);
+	}
+}
+
+/* Returns new sk_buff, or NULL */
+struct sk_buff *
+ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user)
+{
+	struct sock *sk = skb->sk;
+#ifdef CONFIG_NETFILTER_DEBUG
+	unsigned int olddebug = skb->nf_debug;
+#endif
+
+	if (sk) {
+		sock_hold(sk);
+		skb_orphan(skb);
+	}
+
+	local_bh_disable(); 
+	skb = ip_defrag(skb, user);
+	local_bh_enable();
+
+	if (!skb) {
+		if (sk)
+			sock_put(sk);
+		return skb;
+	}
+
+	if (sk) {
+		skb_set_owner_w(skb, sk);
+		sock_put(sk);
+	}
+
+	ip_send_check(skb->nh.iph);
+	skb->nfcache |= NFC_ALTERED;
+#ifdef CONFIG_NETFILTER_DEBUG
+	/* Packet path as if nothing had happened. */
+	skb->nf_debug = olddebug;
+#endif
+	return skb;
+}
+
+/* Used by ipt_REJECT. */
+static void ip_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb)
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+
+	/* This ICMP is in reverse direction to the packet which caused it */
+	ct = ip_conntrack_get(skb, &ctinfo);
+	
+	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL)
+		ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY;
+	else
+		ctinfo = IP_CT_RELATED;
+
+	/* Attach to new skbuff, and increment count */
+	nskb->nfct = &ct->ct_general;
+	nskb->nfctinfo = ctinfo;
+	nf_conntrack_get(nskb->nfct);
+}
+
+static inline int
+do_iter(const struct ip_conntrack_tuple_hash *i,
+	int (*iter)(struct ip_conntrack *i, void *data),
+	void *data)
+{
+	return iter(tuplehash_to_ctrack(i), data);
+}
+
+/* Bring out ya dead! */
+static struct ip_conntrack_tuple_hash *
+get_next_corpse(int (*iter)(struct ip_conntrack *i, void *data),
+		void *data, unsigned int *bucket)
+{
+	struct ip_conntrack_tuple_hash *h = NULL;
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	for (; *bucket < ip_conntrack_htable_size; (*bucket)++) {
+		h = LIST_FIND_W(&ip_conntrack_hash[*bucket], do_iter,
+				struct ip_conntrack_tuple_hash *, iter, data);
+		if (h)
+			break;
+	}
+	if (!h)
+		h = LIST_FIND_W(&unconfirmed, do_iter,
+				struct ip_conntrack_tuple_hash *, iter, data);
+	if (h)
+		atomic_inc(&tuplehash_to_ctrack(h)->ct_general.use);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	return h;
+}
+
+void
+ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *), void *data)
+{
+	struct ip_conntrack_tuple_hash *h;
+	unsigned int bucket = 0;
+
+	while ((h = get_next_corpse(iter, data, &bucket)) != NULL) {
+		struct ip_conntrack *ct = tuplehash_to_ctrack(h);
+		/* Time to push up daises... */
+		if (del_timer(&ct->timeout))
+			death_by_timeout((unsigned long)ct);
+		/* ... else the timer will get him soon. */
+
+		ip_conntrack_put(ct);
+	}
+}
+
+/* Fast function for those who don't want to parse /proc (and I don't
+   blame them). */
+/* Reversing the socket's dst/src point of view gives us the reply
+   mapping. */
+static int
+getorigdst(struct sock *sk, int optval, void __user *user, int *len)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	struct ip_conntrack_tuple_hash *h;
+	struct ip_conntrack_tuple tuple;
+	
+	IP_CT_TUPLE_U_BLANK(&tuple);
+	tuple.src.ip = inet->rcv_saddr;
+	tuple.src.u.tcp.port = inet->sport;
+	tuple.dst.ip = inet->daddr;
+	tuple.dst.u.tcp.port = inet->dport;
+	tuple.dst.protonum = IPPROTO_TCP;
+
+	/* We only do TCP at the moment: is there a better way? */
+	if (strcmp(sk->sk_prot->name, "TCP")) {
+		DEBUGP("SO_ORIGINAL_DST: Not a TCP socket\n");
+		return -ENOPROTOOPT;
+	}
+
+	if ((unsigned int) *len < sizeof(struct sockaddr_in)) {
+		DEBUGP("SO_ORIGINAL_DST: len %u not %u\n",
+		       *len, sizeof(struct sockaddr_in));
+		return -EINVAL;
+	}
+
+	h = ip_conntrack_find_get(&tuple, NULL);
+	if (h) {
+		struct sockaddr_in sin;
+		struct ip_conntrack *ct = tuplehash_to_ctrack(h);
+
+		sin.sin_family = AF_INET;
+		sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
+			.tuple.dst.u.tcp.port;
+		sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
+			.tuple.dst.ip;
+
+		DEBUGP("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n",
+		       NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
+		ip_conntrack_put(ct);
+		if (copy_to_user(user, &sin, sizeof(sin)) != 0)
+			return -EFAULT;
+		else
+			return 0;
+	}
+	DEBUGP("SO_ORIGINAL_DST: Can't find %u.%u.%u.%u/%u-%u.%u.%u.%u/%u.\n",
+	       NIPQUAD(tuple.src.ip), ntohs(tuple.src.u.tcp.port),
+	       NIPQUAD(tuple.dst.ip), ntohs(tuple.dst.u.tcp.port));
+	return -ENOENT;
+}
+
+static struct nf_sockopt_ops so_getorigdst = {
+	.pf		= PF_INET,
+	.get_optmin	= SO_ORIGINAL_DST,
+	.get_optmax	= SO_ORIGINAL_DST+1,
+	.get		= &getorigdst,
+};
+
+static int kill_all(struct ip_conntrack *i, void *data)
+{
+	return 1;
+}
+
+static void free_conntrack_hash(void)
+{
+	if (ip_conntrack_vmalloc)
+		vfree(ip_conntrack_hash);
+	else
+		free_pages((unsigned long)ip_conntrack_hash, 
+			   get_order(sizeof(struct list_head)
+				     * ip_conntrack_htable_size));
+}
+
+/* Mishearing the voices in his head, our hero wonders how he's
+   supposed to kill the mall. */
+void ip_conntrack_cleanup(void)
+{
+	ip_ct_attach = NULL;
+	/* This makes sure all current packets have passed through
+           netfilter framework.  Roll on, two-stage module
+           delete... */
+	synchronize_net();
+ 
+ i_see_dead_people:
+	ip_ct_iterate_cleanup(kill_all, NULL);
+	if (atomic_read(&ip_conntrack_count) != 0) {
+		schedule();
+		goto i_see_dead_people;
+	}
+
+	kmem_cache_destroy(ip_conntrack_cachep);
+	kmem_cache_destroy(ip_conntrack_expect_cachep);
+	free_conntrack_hash();
+	nf_unregister_sockopt(&so_getorigdst);
+}
+
+static int hashsize;
+module_param(hashsize, int, 0400);
+
+int __init ip_conntrack_init(void)
+{
+	unsigned int i;
+	int ret;
+
+	/* Idea from tcp.c: use 1/16384 of memory.  On i386: 32MB
+	 * machine has 256 buckets.  >= 1GB machines have 8192 buckets. */
+ 	if (hashsize) {
+ 		ip_conntrack_htable_size = hashsize;
+ 	} else {
+		ip_conntrack_htable_size
+			= (((num_physpages << PAGE_SHIFT) / 16384)
+			   / sizeof(struct list_head));
+		if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE))
+			ip_conntrack_htable_size = 8192;
+		if (ip_conntrack_htable_size < 16)
+			ip_conntrack_htable_size = 16;
+	}
+	ip_conntrack_max = 8 * ip_conntrack_htable_size;
+
+	printk("ip_conntrack version %s (%u buckets, %d max)"
+	       " - %Zd bytes per conntrack\n", IP_CONNTRACK_VERSION,
+	       ip_conntrack_htable_size, ip_conntrack_max,
+	       sizeof(struct ip_conntrack));
+
+	ret = nf_register_sockopt(&so_getorigdst);
+	if (ret != 0) {
+		printk(KERN_ERR "Unable to register netfilter socket option\n");
+		return ret;
+	}
+
+	/* AK: the hash table is twice as big than needed because it
+	   uses list_head.  it would be much nicer to caches to use a
+	   single pointer list head here. */
+	ip_conntrack_vmalloc = 0; 
+	ip_conntrack_hash 
+		=(void*)__get_free_pages(GFP_KERNEL, 
+					 get_order(sizeof(struct list_head)
+						   *ip_conntrack_htable_size));
+	if (!ip_conntrack_hash) { 
+		ip_conntrack_vmalloc = 1;
+		printk(KERN_WARNING "ip_conntrack: falling back to vmalloc.\n");
+		ip_conntrack_hash = vmalloc(sizeof(struct list_head)
+					    * ip_conntrack_htable_size);
+	}
+	if (!ip_conntrack_hash) {
+		printk(KERN_ERR "Unable to create ip_conntrack_hash\n");
+		goto err_unreg_sockopt;
+	}
+
+	ip_conntrack_cachep = kmem_cache_create("ip_conntrack",
+	                                        sizeof(struct ip_conntrack), 0,
+	                                        0, NULL, NULL);
+	if (!ip_conntrack_cachep) {
+		printk(KERN_ERR "Unable to create ip_conntrack slab cache\n");
+		goto err_free_hash;
+	}
+
+	ip_conntrack_expect_cachep = kmem_cache_create("ip_conntrack_expect",
+					sizeof(struct ip_conntrack_expect),
+					0, 0, NULL, NULL);
+	if (!ip_conntrack_expect_cachep) {
+		printk(KERN_ERR "Unable to create ip_expect slab cache\n");
+		goto err_free_conntrack_slab;
+	}
+
+	/* Don't NEED lock here, but good form anyway. */
+	WRITE_LOCK(&ip_conntrack_lock);
+	for (i = 0; i < MAX_IP_CT_PROTO; i++)
+		ip_ct_protos[i] = &ip_conntrack_generic_protocol;
+	/* Sew in builtin protocols. */
+	ip_ct_protos[IPPROTO_TCP] = &ip_conntrack_protocol_tcp;
+	ip_ct_protos[IPPROTO_UDP] = &ip_conntrack_protocol_udp;
+	ip_ct_protos[IPPROTO_ICMP] = &ip_conntrack_protocol_icmp;
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	for (i = 0; i < ip_conntrack_htable_size; i++)
+		INIT_LIST_HEAD(&ip_conntrack_hash[i]);
+
+	/* For use by ipt_REJECT */
+	ip_ct_attach = ip_conntrack_attach;
+
+	/* Set up fake conntrack:
+	    - to never be deleted, not in any hashes */
+	atomic_set(&ip_conntrack_untracked.ct_general.use, 1);
+	/*  - and look it like as a confirmed connection */
+	set_bit(IPS_CONFIRMED_BIT, &ip_conntrack_untracked.status);
+
+	return ret;
+
+err_free_conntrack_slab:
+	kmem_cache_destroy(ip_conntrack_cachep);
+err_free_hash:
+	free_conntrack_hash();
+err_unreg_sockopt:
+	nf_unregister_sockopt(&so_getorigdst);
+
+	return -ENOMEM;
+}
diff --git a/net/ipv4/netfilter/ip_conntrack_ftp.c b/net/ipv4/netfilter/ip_conntrack_ftp.c
new file mode 100644
index 000000000000..12b88cbb11db
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_ftp.c
@@ -0,0 +1,501 @@
+/* FTP extension for IP connection tracking. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell  
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <linux/ctype.h>
+#include <net/checksum.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter_ipv4/lockhelp.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
+#include <linux/moduleparam.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
+MODULE_DESCRIPTION("ftp connection tracking helper");
+
+/* This is slow, but it's simple. --RR */
+static char ftp_buffer[65536];
+
+static DECLARE_LOCK(ip_ftp_lock);
+
+#define MAX_PORTS 8
+static int ports[MAX_PORTS];
+static int ports_c;
+module_param_array(ports, int, &ports_c, 0400);
+
+static int loose;
+module_param(loose, int, 0600);
+
+unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
+				enum ip_conntrack_info ctinfo,
+				enum ip_ct_ftp_type type,
+				unsigned int matchoff,
+				unsigned int matchlen,
+				struct ip_conntrack_expect *exp,
+				u32 *seq);
+EXPORT_SYMBOL_GPL(ip_nat_ftp_hook);
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static int try_rfc959(const char *, size_t, u_int32_t [], char);
+static int try_eprt(const char *, size_t, u_int32_t [], char);
+static int try_epsv_response(const char *, size_t, u_int32_t [], char);
+
+static struct ftp_search {
+	enum ip_conntrack_dir dir;
+	const char *pattern;
+	size_t plen;
+	char skip;
+	char term;
+	enum ip_ct_ftp_type ftptype;
+	int (*getnum)(const char *, size_t, u_int32_t[], char);
+} search[] = {
+	{
+		IP_CT_DIR_ORIGINAL,
+		"PORT",	sizeof("PORT") - 1, ' ', '\r',
+		IP_CT_FTP_PORT,
+		try_rfc959,
+	},
+	{
+		IP_CT_DIR_REPLY,
+		"227 ",	sizeof("227 ") - 1, '(', ')',
+		IP_CT_FTP_PASV,
+		try_rfc959,
+	},
+	{
+		IP_CT_DIR_ORIGINAL,
+		"EPRT", sizeof("EPRT") - 1, ' ', '\r',
+		IP_CT_FTP_EPRT,
+		try_eprt,
+	},
+	{
+		IP_CT_DIR_REPLY,
+		"229 ", sizeof("229 ") - 1, '(', ')',
+		IP_CT_FTP_EPSV,
+		try_epsv_response,
+	},
+};
+
+static int try_number(const char *data, size_t dlen, u_int32_t array[],
+		      int array_size, char sep, char term)
+{
+	u_int32_t i, len;
+
+	memset(array, 0, sizeof(array[0])*array_size);
+
+	/* Keep data pointing at next char. */
+	for (i = 0, len = 0; len < dlen && i < array_size; len++, data++) {
+		if (*data >= '0' && *data <= '9') {
+			array[i] = array[i]*10 + *data - '0';
+		}
+		else if (*data == sep)
+			i++;
+		else {
+			/* Unexpected character; true if it's the
+			   terminator and we're finished. */
+			if (*data == term && i == array_size - 1)
+				return len;
+
+			DEBUGP("Char %u (got %u nums) `%u' unexpected\n",
+			       len, i, *data);
+			return 0;
+		}
+	}
+	DEBUGP("Failed to fill %u numbers separated by %c\n", array_size, sep);
+
+	return 0;
+}
+
+/* Returns 0, or length of numbers: 192,168,1,1,5,6 */
+static int try_rfc959(const char *data, size_t dlen, u_int32_t array[6],
+		       char term)
+{
+	return try_number(data, dlen, array, 6, ',', term);
+}
+
+/* Grab port: number up to delimiter */
+static int get_port(const char *data, int start, size_t dlen, char delim,
+		    u_int32_t array[2])
+{
+	u_int16_t port = 0;
+	int i;
+
+	for (i = start; i < dlen; i++) {
+		/* Finished? */
+		if (data[i] == delim) {
+			if (port == 0)
+				break;
+			array[0] = port >> 8;
+			array[1] = port;
+			return i + 1;
+		}
+		else if (data[i] >= '0' && data[i] <= '9')
+			port = port*10 + data[i] - '0';
+		else /* Some other crap */
+			break;
+	}
+	return 0;
+}
+
+/* Returns 0, or length of numbers: |1|132.235.1.2|6275| */
+static int try_eprt(const char *data, size_t dlen, u_int32_t array[6],
+		    char term)
+{
+	char delim;
+	int length;
+
+	/* First character is delimiter, then "1" for IPv4, then
+           delimiter again. */
+	if (dlen <= 3) return 0;
+	delim = data[0];
+	if (isdigit(delim) || delim < 33 || delim > 126
+	    || data[1] != '1' || data[2] != delim)
+		return 0;
+
+	DEBUGP("EPRT: Got |1|!\n");
+	/* Now we have IP address. */
+	length = try_number(data + 3, dlen - 3, array, 4, '.', delim);
+	if (length == 0)
+		return 0;
+
+	DEBUGP("EPRT: Got IP address!\n");
+	/* Start offset includes initial "|1|", and trailing delimiter */
+	return get_port(data, 3 + length + 1, dlen, delim, array+4);
+}
+
+/* Returns 0, or length of numbers: |||6446| */
+static int try_epsv_response(const char *data, size_t dlen, u_int32_t array[6],
+			     char term)
+{
+	char delim;
+
+	/* Three delimiters. */
+	if (dlen <= 3) return 0;
+	delim = data[0];
+	if (isdigit(delim) || delim < 33 || delim > 126
+	    || data[1] != delim || data[2] != delim)
+		return 0;
+
+	return get_port(data, 3, dlen, delim, array+4);
+}
+
+/* Return 1 for match, 0 for accept, -1 for partial. */
+static int find_pattern(const char *data, size_t dlen,
+			const char *pattern, size_t plen,
+			char skip, char term,
+			unsigned int *numoff,
+			unsigned int *numlen,
+			u_int32_t array[6],
+			int (*getnum)(const char *, size_t, u_int32_t[], char))
+{
+	size_t i;
+
+	DEBUGP("find_pattern `%s': dlen = %u\n", pattern, dlen);
+	if (dlen == 0)
+		return 0;
+
+	if (dlen <= plen) {
+		/* Short packet: try for partial? */
+		if (strnicmp(data, pattern, dlen) == 0)
+			return -1;
+		else return 0;
+	}
+
+	if (strnicmp(data, pattern, plen) != 0) {
+#if 0
+		size_t i;
+
+		DEBUGP("ftp: string mismatch\n");
+		for (i = 0; i < plen; i++) {
+			DEBUGP("ftp:char %u `%c'(%u) vs `%c'(%u)\n",
+				i, data[i], data[i],
+				pattern[i], pattern[i]);
+		}
+#endif
+		return 0;
+	}
+
+	DEBUGP("Pattern matches!\n");
+	/* Now we've found the constant string, try to skip
+	   to the 'skip' character */
+	for (i = plen; data[i] != skip; i++)
+		if (i == dlen - 1) return -1;
+
+	/* Skip over the last character */
+	i++;
+
+	DEBUGP("Skipped up to `%c'!\n", skip);
+
+	*numoff = i;
+	*numlen = getnum(data + i, dlen - i, array, term);
+	if (!*numlen)
+		return -1;
+
+	DEBUGP("Match succeeded!\n");
+	return 1;
+}
+
+/* Look up to see if we're just after a \n. */
+static int find_nl_seq(u16 seq, const struct ip_ct_ftp_master *info, int dir)
+{
+	unsigned int i;
+
+	for (i = 0; i < info->seq_aft_nl_num[dir]; i++)
+		if (info->seq_aft_nl[dir][i] == seq)
+			return 1;
+	return 0;
+}
+
+/* We don't update if it's older than what we have. */
+static void update_nl_seq(u16 nl_seq, struct ip_ct_ftp_master *info, int dir)
+{
+	unsigned int i, oldest = NUM_SEQ_TO_REMEMBER;
+
+	/* Look for oldest: if we find exact match, we're done. */
+	for (i = 0; i < info->seq_aft_nl_num[dir]; i++) {
+		if (info->seq_aft_nl[dir][i] == nl_seq)
+			return;
+
+		if (oldest == info->seq_aft_nl_num[dir]
+		    || before(info->seq_aft_nl[dir][i], oldest))
+			oldest = i;
+	}
+
+	if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER)
+		info->seq_aft_nl[dir][info->seq_aft_nl_num[dir]++] = nl_seq;
+	else if (oldest != NUM_SEQ_TO_REMEMBER)
+		info->seq_aft_nl[dir][oldest] = nl_seq;
+}
+
+static int help(struct sk_buff **pskb,
+		struct ip_conntrack *ct,
+		enum ip_conntrack_info ctinfo)
+{
+	unsigned int dataoff, datalen;
+	struct tcphdr _tcph, *th;
+	char *fb_ptr;
+	int ret;
+	u32 seq, array[6] = { 0 };
+	int dir = CTINFO2DIR(ctinfo);
+	unsigned int matchlen, matchoff;
+	struct ip_ct_ftp_master *ct_ftp_info = &ct->help.ct_ftp_info;
+	struct ip_conntrack_expect *exp;
+	unsigned int i;
+	int found = 0, ends_in_nl;
+
+	/* Until there's been traffic both ways, don't look in packets. */
+	if (ctinfo != IP_CT_ESTABLISHED
+	    && ctinfo != IP_CT_ESTABLISHED+IP_CT_IS_REPLY) {
+		DEBUGP("ftp: Conntrackinfo = %u\n", ctinfo);
+		return NF_ACCEPT;
+	}
+
+	th = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl*4,
+				sizeof(_tcph), &_tcph);
+	if (th == NULL)
+		return NF_ACCEPT;
+
+	dataoff = (*pskb)->nh.iph->ihl*4 + th->doff*4;
+	/* No data? */
+	if (dataoff >= (*pskb)->len) {
+		DEBUGP("ftp: pskblen = %u\n", (*pskb)->len);
+		return NF_ACCEPT;
+	}
+	datalen = (*pskb)->len - dataoff;
+
+	LOCK_BH(&ip_ftp_lock);
+	fb_ptr = skb_header_pointer(*pskb, dataoff,
+				    (*pskb)->len - dataoff, ftp_buffer);
+	BUG_ON(fb_ptr == NULL);
+
+	ends_in_nl = (fb_ptr[datalen - 1] == '\n');
+	seq = ntohl(th->seq) + datalen;
+
+	/* Look up to see if we're just after a \n. */
+	if (!find_nl_seq(ntohl(th->seq), ct_ftp_info, dir)) {
+		/* Now if this ends in \n, update ftp info. */
+		DEBUGP("ip_conntrack_ftp_help: wrong seq pos %s(%u) or %s(%u)\n",
+		       ct_ftp_info->seq_aft_nl[0][dir] 
+		       old_seq_aft_nl_set ? "":"(UNSET) ", old_seq_aft_nl);
+		ret = NF_ACCEPT;
+		goto out_update_nl;
+	}
+
+	/* Initialize IP array to expected address (it's not mentioned
+           in EPSV responses) */
+	array[0] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 24) & 0xFF;
+	array[1] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 16) & 0xFF;
+	array[2] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 8) & 0xFF;
+	array[3] = ntohl(ct->tuplehash[dir].tuple.src.ip) & 0xFF;
+
+	for (i = 0; i < ARRAY_SIZE(search); i++) {
+		if (search[i].dir != dir) continue;
+
+		found = find_pattern(fb_ptr, (*pskb)->len - dataoff,
+				     search[i].pattern,
+				     search[i].plen,
+				     search[i].skip,
+				     search[i].term,
+				     &matchoff, &matchlen,
+				     array,
+				     search[i].getnum);
+		if (found) break;
+	}
+	if (found == -1) {
+		/* We don't usually drop packets.  After all, this is
+		   connection tracking, not packet filtering.
+		   However, it is necessary for accurate tracking in
+		   this case. */
+		if (net_ratelimit())
+			printk("conntrack_ftp: partial %s %u+%u\n",
+			       search[i].pattern,
+			       ntohl(th->seq), datalen);
+		ret = NF_DROP;
+		goto out;
+	} else if (found == 0) { /* No match */
+		ret = NF_ACCEPT;
+		goto out_update_nl;
+	}
+
+	DEBUGP("conntrack_ftp: match `%s' (%u bytes at %u)\n",
+	       fb_ptr + matchoff, matchlen, ntohl(th->seq) + matchoff);
+			 
+	/* Allocate expectation which will be inserted */
+	exp = ip_conntrack_expect_alloc();
+	if (exp == NULL) {
+		ret = NF_DROP;
+		goto out;
+	}
+
+	/* We refer to the reverse direction ("!dir") tuples here,
+	 * because we're expecting something in the other direction.
+	 * Doesn't matter unless NAT is happening.  */
+	exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
+
+	if (htonl((array[0] << 24) | (array[1] << 16) | (array[2] << 8) | array[3])
+	    != ct->tuplehash[dir].tuple.src.ip) {
+		/* Enrico Scholz's passive FTP to partially RNAT'd ftp
+		   server: it really wants us to connect to a
+		   different IP address.  Simply don't record it for
+		   NAT. */
+		DEBUGP("conntrack_ftp: NOT RECORDING: %u,%u,%u,%u != %u.%u.%u.%u\n",
+		       array[0], array[1], array[2], array[3],
+		       NIPQUAD(ct->tuplehash[dir].tuple.src.ip));
+
+		/* Thanks to Cristiano Lincoln Mattos
+		   <lincoln@cesar.org.br> for reporting this potential
+		   problem (DMZ machines opening holes to internal
+		   networks, or the packet filter itself). */
+		if (!loose) {
+			ret = NF_ACCEPT;
+			ip_conntrack_expect_free(exp);
+			goto out_update_nl;
+		}
+		exp->tuple.dst.ip = htonl((array[0] << 24) | (array[1] << 16)
+					 | (array[2] << 8) | array[3]);
+	}
+
+	exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
+	exp->tuple.dst.u.tcp.port = htons(array[4] << 8 | array[5]);
+	exp->tuple.src.u.tcp.port = 0; /* Don't care. */
+	exp->tuple.dst.protonum = IPPROTO_TCP;
+	exp->mask = ((struct ip_conntrack_tuple)
+		{ { 0xFFFFFFFF, { 0 } },
+		  { 0xFFFFFFFF, { .tcp = { 0xFFFF } }, 0xFF }});
+
+	exp->expectfn = NULL;
+	exp->master = ct;
+
+	/* Now, NAT might want to mangle the packet, and register the
+	 * (possibly changed) expectation itself. */
+	if (ip_nat_ftp_hook)
+		ret = ip_nat_ftp_hook(pskb, ctinfo, search[i].ftptype,
+				      matchoff, matchlen, exp, &seq);
+	else {
+		/* Can't expect this?  Best to drop packet now. */
+		if (ip_conntrack_expect_related(exp) != 0) {
+			ip_conntrack_expect_free(exp);
+			ret = NF_DROP;
+		} else
+			ret = NF_ACCEPT;
+	}
+
+out_update_nl:
+	/* Now if this ends in \n, update ftp info.  Seq may have been
+	 * adjusted by NAT code. */
+	if (ends_in_nl)
+		update_nl_seq(seq, ct_ftp_info,dir);
+ out:
+	UNLOCK_BH(&ip_ftp_lock);
+	return ret;
+}
+
+static struct ip_conntrack_helper ftp[MAX_PORTS];
+static char ftp_names[MAX_PORTS][10];
+
+/* Not __exit: called from init() */
+static void fini(void)
+{
+	int i;
+	for (i = 0; i < ports_c; i++) {
+		DEBUGP("ip_ct_ftp: unregistering helper for port %d\n",
+				ports[i]);
+		ip_conntrack_helper_unregister(&ftp[i]);
+	}
+}
+
+static int __init init(void)
+{
+	int i, ret;
+	char *tmpname;
+
+	if (ports_c == 0)
+		ports[ports_c++] = FTP_PORT;
+
+	for (i = 0; i < ports_c; i++) {
+		ftp[i].tuple.src.u.tcp.port = htons(ports[i]);
+		ftp[i].tuple.dst.protonum = IPPROTO_TCP;
+		ftp[i].mask.src.u.tcp.port = 0xFFFF;
+		ftp[i].mask.dst.protonum = 0xFF;
+		ftp[i].max_expected = 1;
+		ftp[i].timeout = 5 * 60; /* 5 minutes */
+		ftp[i].me = THIS_MODULE;
+		ftp[i].help = help;
+
+		tmpname = &ftp_names[i][0];
+		if (ports[i] == FTP_PORT)
+			sprintf(tmpname, "ftp");
+		else
+			sprintf(tmpname, "ftp-%d", ports[i]);
+		ftp[i].name = tmpname;
+
+		DEBUGP("ip_ct_ftp: registering helper for port %d\n", 
+				ports[i]);
+		ret = ip_conntrack_helper_register(&ftp[i]);
+
+		if (ret) {
+			fini();
+			return ret;
+		}
+	}
+	return 0;
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_conntrack_irc.c b/net/ipv4/netfilter/ip_conntrack_irc.c
new file mode 100644
index 000000000000..33cc7348b6ee
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_irc.c
@@ -0,0 +1,313 @@
+/* IRC extension for IP connection tracking, Version 1.21
+ * (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
+ * based on RR's ip_conntrack_ftp.c	
+ *
+ * ip_conntrack_irc.c,v 1.21 2002/02/05 14:49:26 laforge Exp
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ **
+ *	Module load syntax:
+ * 	insmod ip_conntrack_irc.o ports=port1,port2,...port<MAX_PORTS>
+ *			    max_dcc_channels=n dcc_timeout=secs
+ *	
+ * 	please give the ports of all IRC servers You wish to connect to.
+ *	If You don't specify ports, the default will be port 6667.
+ *	With max_dcc_channels you can define the maximum number of not
+ *	yet answered DCC channels per IRC session (default 8).
+ *	With dcc_timeout you can specify how long the system waits for 
+ *	an expected DCC channel (default 300 seconds).
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter_ipv4/lockhelp.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_irc.h>
+#include <linux/moduleparam.h>
+
+#define MAX_PORTS 8
+static int ports[MAX_PORTS];
+static int ports_c;
+static int max_dcc_channels = 8;
+static unsigned int dcc_timeout = 300;
+/* This is slow, but it's simple. --RR */
+static char irc_buffer[65536];
+static DECLARE_LOCK(irc_buffer_lock);
+
+unsigned int (*ip_nat_irc_hook)(struct sk_buff **pskb,
+				enum ip_conntrack_info ctinfo,
+				unsigned int matchoff,
+				unsigned int matchlen,
+				struct ip_conntrack_expect *exp);
+EXPORT_SYMBOL_GPL(ip_nat_irc_hook);
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("IRC (DCC) connection tracking helper");
+MODULE_LICENSE("GPL");
+module_param_array(ports, int, &ports_c, 0400);
+MODULE_PARM_DESC(ports, "port numbers of IRC servers");
+module_param(max_dcc_channels, int, 0400);
+MODULE_PARM_DESC(max_dcc_channels, "max number of expected DCC channels per IRC session");
+module_param(dcc_timeout, int, 0400);
+MODULE_PARM_DESC(dcc_timeout, "timeout on for unestablished DCC channels");
+
+static char *dccprotos[] = { "SEND ", "CHAT ", "MOVE ", "TSEND ", "SCHAT " };
+#define MINMATCHLEN	5
+
+#if 0
+#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s:" format, \
+                                       __FILE__, __FUNCTION__ , ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static int parse_dcc(char *data, char *data_end, u_int32_t *ip,
+		     u_int16_t *port, char **ad_beg_p, char **ad_end_p)
+/* tries to get the ip_addr and port out of a dcc command
+   return value: -1 on failure, 0 on success 
+	data		pointer to first byte of DCC command data
+	data_end	pointer to last byte of dcc command data
+	ip		returns parsed ip of dcc command
+	port		returns parsed port of dcc command
+	ad_beg_p	returns pointer to first byte of addr data
+	ad_end_p	returns pointer to last byte of addr data */
+{
+
+	/* at least 12: "AAAAAAAA P\1\n" */
+	while (*data++ != ' ')
+		if (data > data_end - 12)
+			return -1;
+
+	*ad_beg_p = data;
+	*ip = simple_strtoul(data, &data, 10);
+
+	/* skip blanks between ip and port */
+	while (*data == ' ') {
+		if (data >= data_end) 
+			return -1;
+		data++;
+	}
+
+	*port = simple_strtoul(data, &data, 10);
+	*ad_end_p = data;
+
+	return 0;
+}
+
+static int help(struct sk_buff **pskb,
+		struct ip_conntrack *ct, enum ip_conntrack_info ctinfo)
+{
+	unsigned int dataoff;
+	struct tcphdr _tcph, *th;
+	char *data, *data_limit, *ib_ptr;
+	int dir = CTINFO2DIR(ctinfo);
+	struct ip_conntrack_expect *exp;
+	u32 seq;
+	u_int32_t dcc_ip;
+	u_int16_t dcc_port;
+	int i, ret = NF_ACCEPT;
+	char *addr_beg_p, *addr_end_p;
+
+	DEBUGP("entered\n");
+
+	/* If packet is coming from IRC server */
+	if (dir == IP_CT_DIR_REPLY)
+		return NF_ACCEPT;
+
+	/* Until there's been traffic both ways, don't look in packets. */
+	if (ctinfo != IP_CT_ESTABLISHED
+	    && ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
+		DEBUGP("Conntrackinfo = %u\n", ctinfo);
+		return NF_ACCEPT;
+	}
+
+	/* Not a full tcp header? */
+	th = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl*4,
+				sizeof(_tcph), &_tcph);
+	if (th == NULL)
+		return NF_ACCEPT;
+
+	/* No data? */
+	dataoff = (*pskb)->nh.iph->ihl*4 + th->doff*4;
+	if (dataoff >= (*pskb)->len)
+		return NF_ACCEPT;
+
+	LOCK_BH(&irc_buffer_lock);
+	ib_ptr = skb_header_pointer(*pskb, dataoff,
+				    (*pskb)->len - dataoff, irc_buffer);
+	BUG_ON(ib_ptr == NULL);
+
+	data = ib_ptr;
+	data_limit = ib_ptr + (*pskb)->len - dataoff;
+
+	/* strlen("\1DCC SENT t AAAAAAAA P\1\n")=24
+	 * 5+MINMATCHLEN+strlen("t AAAAAAAA P\1\n")=14 */
+	while (data < (data_limit - (19 + MINMATCHLEN))) {
+		if (memcmp(data, "\1DCC ", 5)) {
+			data++;
+			continue;
+		}
+
+		data += 5;
+		/* we have at least (19+MINMATCHLEN)-5 bytes valid data left */
+
+		DEBUGP("DCC found in master %u.%u.%u.%u:%u %u.%u.%u.%u:%u...\n",
+			NIPQUAD(iph->saddr), ntohs(th->source),
+			NIPQUAD(iph->daddr), ntohs(th->dest));
+
+		for (i = 0; i < ARRAY_SIZE(dccprotos); i++) {
+			if (memcmp(data, dccprotos[i], strlen(dccprotos[i]))) {
+				/* no match */
+				continue;
+			}
+
+			DEBUGP("DCC %s detected\n", dccprotos[i]);
+			data += strlen(dccprotos[i]);
+			/* we have at least 
+			 * (19+MINMATCHLEN)-5-dccprotos[i].matchlen bytes valid
+			 * data left (== 14/13 bytes) */
+			if (parse_dcc((char *)data, data_limit, &dcc_ip,
+				       &dcc_port, &addr_beg_p, &addr_end_p)) {
+				/* unable to parse */
+				DEBUGP("unable to parse dcc command\n");
+				continue;
+			}
+			DEBUGP("DCC bound ip/port: %u.%u.%u.%u:%u\n",
+				HIPQUAD(dcc_ip), dcc_port);
+
+			/* dcc_ip can be the internal OR external (NAT'ed) IP
+			 * Tiago Sousa <mirage@kaotik.org> */
+			if (ct->tuplehash[dir].tuple.src.ip != htonl(dcc_ip)
+			    && ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip != htonl(dcc_ip)) {
+				if (net_ratelimit())
+					printk(KERN_WARNING
+						"Forged DCC command from "
+						"%u.%u.%u.%u: %u.%u.%u.%u:%u\n",
+				NIPQUAD(ct->tuplehash[dir].tuple.src.ip),
+						HIPQUAD(dcc_ip), dcc_port);
+
+				continue;
+			}
+
+			exp = ip_conntrack_expect_alloc();
+			if (exp == NULL) {
+				ret = NF_DROP;
+				goto out;
+			}
+
+			/* save position of address in dcc string,
+			 * necessary for NAT */
+			DEBUGP("tcph->seq = %u\n", th->seq);
+			seq = ntohl(th->seq) + (addr_beg_p - ib_ptr);
+
+			/* We refer to the reverse direction ("!dir")
+			 * tuples here, because we're expecting
+			 * something in the other * direction.
+			 * Doesn't matter unless NAT is happening.  */
+			exp->tuple = ((struct ip_conntrack_tuple)
+				{ { 0, { 0 } },
+				  { ct->tuplehash[!dir].tuple.dst.ip,
+				    { .tcp = { htons(dcc_port) } },
+				    IPPROTO_TCP }});
+			exp->mask = ((struct ip_conntrack_tuple)
+				{ { 0, { 0 } },
+				  { 0xFFFFFFFF, { .tcp = { 0xFFFF } }, 0xFF }});
+			exp->expectfn = NULL;
+			exp->master = ct;
+			if (ip_nat_irc_hook)
+				ret = ip_nat_irc_hook(pskb, ctinfo, 
+						      addr_beg_p - ib_ptr,
+						      addr_end_p - addr_beg_p,
+						      exp);
+			else if (ip_conntrack_expect_related(exp) != 0) {
+				ip_conntrack_expect_free(exp);
+				ret = NF_DROP;
+			}
+			goto out;
+		} /* for .. NUM_DCCPROTO */
+	} /* while data < ... */
+
+ out:
+	UNLOCK_BH(&irc_buffer_lock);
+	return ret;
+}
+
+static struct ip_conntrack_helper irc_helpers[MAX_PORTS];
+static char irc_names[MAX_PORTS][10];
+
+static void fini(void);
+
+static int __init init(void)
+{
+	int i, ret;
+	struct ip_conntrack_helper *hlpr;
+	char *tmpname;
+
+	if (max_dcc_channels < 1) {
+		printk("ip_conntrack_irc: max_dcc_channels must be a positive integer\n");
+		return -EBUSY;
+	}
+	if (dcc_timeout < 0) {
+		printk("ip_conntrack_irc: dcc_timeout must be a positive integer\n");
+		return -EBUSY;
+	}
+	
+	/* If no port given, default to standard irc port */
+	if (ports_c == 0)
+		ports[ports_c++] = IRC_PORT;
+
+	for (i = 0; i < ports_c; i++) {
+		hlpr = &irc_helpers[i];
+		hlpr->tuple.src.u.tcp.port = htons(ports[i]);
+		hlpr->tuple.dst.protonum = IPPROTO_TCP;
+		hlpr->mask.src.u.tcp.port = 0xFFFF;
+		hlpr->mask.dst.protonum = 0xFF;
+		hlpr->max_expected = max_dcc_channels;
+		hlpr->timeout = dcc_timeout;
+		hlpr->me = THIS_MODULE;
+		hlpr->help = help;
+
+		tmpname = &irc_names[i][0];
+		if (ports[i] == IRC_PORT)
+			sprintf(tmpname, "irc");
+		else
+			sprintf(tmpname, "irc-%d", i);
+		hlpr->name = tmpname;
+
+		DEBUGP("port #%d: %d\n", i, ports[i]);
+
+		ret = ip_conntrack_helper_register(hlpr);
+
+		if (ret) {
+			printk("ip_conntrack_irc: ERROR registering port %d\n",
+				ports[i]);
+			fini();
+			return -EBUSY;
+		}
+	}
+	return 0;
+}
+
+/* This function is intentionally _NOT_ defined as __exit, because 
+ * it is needed by the init function */
+static void fini(void)
+{
+	int i;
+	for (i = 0; i < ports_c; i++) {
+		DEBUGP("unregistering port %d\n",
+		       ports[i]);
+		ip_conntrack_helper_unregister(&irc_helpers[i]);
+	}
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_generic.c b/net/ipv4/netfilter/ip_conntrack_proto_generic.c
new file mode 100644
index 000000000000..88c3712bd251
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_proto_generic.c
@@ -0,0 +1,75 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+
+unsigned long ip_ct_generic_timeout = 600*HZ;
+
+static int generic_pkt_to_tuple(const struct sk_buff *skb,
+				unsigned int dataoff,
+				struct ip_conntrack_tuple *tuple)
+{
+	tuple->src.u.all = 0;
+	tuple->dst.u.all = 0;
+
+	return 1;
+}
+
+static int generic_invert_tuple(struct ip_conntrack_tuple *tuple,
+				const struct ip_conntrack_tuple *orig)
+{
+	tuple->src.u.all = 0;
+	tuple->dst.u.all = 0;
+
+	return 1;
+}
+
+/* Print out the per-protocol part of the tuple. */
+static int generic_print_tuple(struct seq_file *s,
+			       const struct ip_conntrack_tuple *tuple)
+{
+	return 0;
+}
+
+/* Print out the private part of the conntrack. */
+static int generic_print_conntrack(struct seq_file *s,
+				   const struct ip_conntrack *state)
+{
+	return 0;
+}
+
+/* Returns verdict for packet, or -1 for invalid. */
+static int packet(struct ip_conntrack *conntrack,
+		  const struct sk_buff *skb,
+		  enum ip_conntrack_info ctinfo)
+{
+	ip_ct_refresh_acct(conntrack, ctinfo, skb, ip_ct_generic_timeout);
+	return NF_ACCEPT;
+}
+
+/* Called when a new connection for this protocol found. */
+static int new(struct ip_conntrack *conntrack, const struct sk_buff *skb)
+{
+	return 1;
+}
+
+struct ip_conntrack_protocol ip_conntrack_generic_protocol =
+{
+	.proto			= 0,
+	.name			= "unknown",
+	.pkt_to_tuple		= generic_pkt_to_tuple,
+	.invert_tuple		= generic_invert_tuple,
+	.print_tuple		= generic_print_tuple,
+	.print_conntrack	= generic_print_conntrack,
+	.packet			= packet,
+	.new			= new,
+};
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
new file mode 100644
index 000000000000..602c74db3252
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
@@ -0,0 +1,279 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/netfilter.h>
+#include <linux/in.h>
+#include <linux/icmp.h>
+#include <linux/seq_file.h>
+#include <net/ip.h>
+#include <net/checksum.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+
+unsigned long ip_ct_icmp_timeout = 30*HZ;
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static int icmp_pkt_to_tuple(const struct sk_buff *skb,
+			     unsigned int dataoff,
+			     struct ip_conntrack_tuple *tuple)
+{
+	struct icmphdr _hdr, *hp;
+
+	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
+	if (hp == NULL)
+		return 0;
+
+	tuple->dst.u.icmp.type = hp->type;
+	tuple->src.u.icmp.id = hp->un.echo.id;
+	tuple->dst.u.icmp.code = hp->code;
+
+	return 1;
+}
+
+static int icmp_invert_tuple(struct ip_conntrack_tuple *tuple,
+			     const struct ip_conntrack_tuple *orig)
+{
+	/* Add 1; spaces filled with 0. */
+	static u_int8_t invmap[]
+		= { [ICMP_ECHO] = ICMP_ECHOREPLY + 1,
+		    [ICMP_ECHOREPLY] = ICMP_ECHO + 1,
+		    [ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
+		    [ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
+		    [ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
+		    [ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
+		    [ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
+		    [ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1};
+
+	if (orig->dst.u.icmp.type >= sizeof(invmap)
+	    || !invmap[orig->dst.u.icmp.type])
+		return 0;
+
+	tuple->src.u.icmp.id = orig->src.u.icmp.id;
+	tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
+	tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
+	return 1;
+}
+
+/* Print out the per-protocol part of the tuple. */
+static int icmp_print_tuple(struct seq_file *s,
+			    const struct ip_conntrack_tuple *tuple)
+{
+	return seq_printf(s, "type=%u code=%u id=%u ",
+			  tuple->dst.u.icmp.type,
+			  tuple->dst.u.icmp.code,
+			  ntohs(tuple->src.u.icmp.id));
+}
+
+/* Print out the private part of the conntrack. */
+static int icmp_print_conntrack(struct seq_file *s,
+				const struct ip_conntrack *conntrack)
+{
+	return 0;
+}
+
+/* Returns verdict for packet, or -1 for invalid. */
+static int icmp_packet(struct ip_conntrack *ct,
+		       const struct sk_buff *skb,
+		       enum ip_conntrack_info ctinfo)
+{
+	/* Try to delete connection immediately after all replies:
+           won't actually vanish as we still have skb, and del_timer
+           means this will only run once even if count hits zero twice
+           (theoretically possible with SMP) */
+	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
+		if (atomic_dec_and_test(&ct->proto.icmp.count)
+		    && del_timer(&ct->timeout))
+			ct->timeout.function((unsigned long)ct);
+	} else {
+		atomic_inc(&ct->proto.icmp.count);
+		ip_ct_refresh_acct(ct, ctinfo, skb, ip_ct_icmp_timeout);
+	}
+
+	return NF_ACCEPT;
+}
+
+/* Called when a new connection for this protocol found. */
+static int icmp_new(struct ip_conntrack *conntrack,
+		    const struct sk_buff *skb)
+{
+	static u_int8_t valid_new[]
+		= { [ICMP_ECHO] = 1,
+		    [ICMP_TIMESTAMP] = 1,
+		    [ICMP_INFO_REQUEST] = 1,
+		    [ICMP_ADDRESS] = 1 };
+
+	if (conntrack->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
+	    || !valid_new[conntrack->tuplehash[0].tuple.dst.u.icmp.type]) {
+		/* Can't create a new ICMP `conn' with this. */
+		DEBUGP("icmp: can't create new conn with type %u\n",
+		       conntrack->tuplehash[0].tuple.dst.u.icmp.type);
+		DUMP_TUPLE(&conntrack->tuplehash[0].tuple);
+		return 0;
+	}
+	atomic_set(&conntrack->proto.icmp.count, 0);
+	return 1;
+}
+
+static int
+icmp_error_message(struct sk_buff *skb,
+		   enum ip_conntrack_info *ctinfo,
+		   unsigned int hooknum)
+{
+	struct ip_conntrack_tuple innertuple, origtuple;
+	struct {
+		struct icmphdr icmp;
+		struct iphdr ip;
+	} _in, *inside;
+	struct ip_conntrack_protocol *innerproto;
+	struct ip_conntrack_tuple_hash *h;
+	int dataoff;
+
+	IP_NF_ASSERT(skb->nfct == NULL);
+
+	/* Not enough header? */
+	inside = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_in), &_in);
+	if (inside == NULL)
+		return NF_ACCEPT;
+
+	/* Ignore ICMP's containing fragments (shouldn't happen) */
+	if (inside->ip.frag_off & htons(IP_OFFSET)) {
+		DEBUGP("icmp_error_track: fragment of proto %u\n",
+		       inside->ip.protocol);
+		return NF_ACCEPT;
+	}
+
+	innerproto = ip_ct_find_proto(inside->ip.protocol);
+	dataoff = skb->nh.iph->ihl*4 + sizeof(inside->icmp) + inside->ip.ihl*4;
+	/* Are they talking about one of our connections? */
+	if (!ip_ct_get_tuple(&inside->ip, skb, dataoff, &origtuple, innerproto)) {
+		DEBUGP("icmp_error: ! get_tuple p=%u", inside->ip.protocol);
+		return NF_ACCEPT;
+	}
+
+	/* Ordinarily, we'd expect the inverted tupleproto, but it's
+	   been preserved inside the ICMP. */
+	if (!ip_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
+		DEBUGP("icmp_error_track: Can't invert tuple\n");
+		return NF_ACCEPT;
+	}
+
+	*ctinfo = IP_CT_RELATED;
+
+	h = ip_conntrack_find_get(&innertuple, NULL);
+	if (!h) {
+		/* Locally generated ICMPs will match inverted if they
+		   haven't been SNAT'ed yet */
+		/* FIXME: NAT code has to handle half-done double NAT --RR */
+		if (hooknum == NF_IP_LOCAL_OUT)
+			h = ip_conntrack_find_get(&origtuple, NULL);
+
+		if (!h) {
+			DEBUGP("icmp_error_track: no match\n");
+			return NF_ACCEPT;
+		}
+		/* Reverse direction from that found */
+		if (DIRECTION(h) != IP_CT_DIR_REPLY)
+			*ctinfo += IP_CT_IS_REPLY;
+	} else {
+		if (DIRECTION(h) == IP_CT_DIR_REPLY)
+			*ctinfo += IP_CT_IS_REPLY;
+	}
+
+	/* Update skb to refer to this connection */
+	skb->nfct = &tuplehash_to_ctrack(h)->ct_general;
+	skb->nfctinfo = *ctinfo;
+	return -NF_ACCEPT;
+}
+
+/* Small and modified version of icmp_rcv */
+static int
+icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
+	   unsigned int hooknum)
+{
+	struct icmphdr _ih, *icmph;
+
+	/* Not enough header? */
+	icmph = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_ih), &_ih);
+	if (icmph == NULL) {
+		if (LOG_INVALID(IPPROTO_ICMP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL,
+				      "ip_ct_icmp: short packet ");
+		return -NF_ACCEPT;
+	}
+
+	/* See ip_conntrack_proto_tcp.c */
+	if (hooknum != NF_IP_PRE_ROUTING)
+		goto checksum_skipped;
+
+	switch (skb->ip_summed) {
+	case CHECKSUM_HW:
+		if (!(u16)csum_fold(skb->csum)) 
+			break;
+		if (LOG_INVALID(IPPROTO_ICMP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				      "ip_ct_icmp: bad HW ICMP checksum ");
+		return -NF_ACCEPT;
+	case CHECKSUM_NONE:
+		if ((u16)csum_fold(skb_checksum(skb, 0, skb->len, 0))) {
+			if (LOG_INVALID(IPPROTO_ICMP))
+				nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+					      "ip_ct_icmp: bad ICMP checksum ");
+			return -NF_ACCEPT;
+		}
+	default:
+		break;
+	}
+
+checksum_skipped:
+	/*
+	 *	18 is the highest 'known' ICMP type. Anything else is a mystery
+	 *
+	 *	RFC 1122: 3.2.2  Unknown ICMP messages types MUST be silently
+	 *		  discarded.
+	 */
+	if (icmph->type > NR_ICMP_TYPES) {
+		if (LOG_INVALID(IPPROTO_ICMP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL,
+				      "ip_ct_icmp: invalid ICMP type ");
+		return -NF_ACCEPT;
+	}
+
+	/* Need to track icmp error message? */
+	if (icmph->type != ICMP_DEST_UNREACH
+	    && icmph->type != ICMP_SOURCE_QUENCH
+	    && icmph->type != ICMP_TIME_EXCEEDED
+	    && icmph->type != ICMP_PARAMETERPROB
+	    && icmph->type != ICMP_REDIRECT)
+		return NF_ACCEPT;
+
+	return icmp_error_message(skb, ctinfo, hooknum);
+}
+
+struct ip_conntrack_protocol ip_conntrack_protocol_icmp =
+{
+	.proto 			= IPPROTO_ICMP,
+	.name 			= "icmp",
+	.pkt_to_tuple		= icmp_pkt_to_tuple,
+	.invert_tuple		= icmp_invert_tuple,
+	.print_tuple		= icmp_print_tuple,
+	.print_conntrack	= icmp_print_conntrack,
+	.packet			= icmp_packet,
+	.new			= icmp_new,
+	.error			= icmp_error,
+};
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
new file mode 100644
index 000000000000..ff8c34a860ff
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
@@ -0,0 +1,649 @@
+/*
+ * Connection tracking protocol helper module for SCTP.
+ * 
+ * SCTP is defined in RFC 2960. References to various sections in this code 
+ * are to this RFC.
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * Added support for proc manipulation of timeouts.
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/netfilter.h>
+#include <linux/module.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/sctp.h>
+#include <linux/string.h>
+#include <linux/seq_file.h>
+
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+#include <linux/netfilter_ipv4/lockhelp.h>
+
+#if 0
+#define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* Protects conntrack->proto.sctp */
+static DECLARE_RWLOCK(sctp_lock);
+
+/* FIXME: Examine ipfilter's timeouts and conntrack transitions more
+   closely.  They're more complex. --RR 
+
+   And so for me for SCTP :D -Kiran */
+
+static const char *sctp_conntrack_names[] = {
+	"NONE",
+	"CLOSED",
+	"COOKIE_WAIT",
+	"COOKIE_ECHOED",
+	"ESTABLISHED",
+	"SHUTDOWN_SENT",
+	"SHUTDOWN_RECD",
+	"SHUTDOWN_ACK_SENT",
+};
+
+#define SECS  * HZ
+#define MINS  * 60 SECS
+#define HOURS * 60 MINS
+#define DAYS  * 24 HOURS
+
+static unsigned long ip_ct_sctp_timeout_closed            =  10 SECS;
+static unsigned long ip_ct_sctp_timeout_cookie_wait       =   3 SECS;
+static unsigned long ip_ct_sctp_timeout_cookie_echoed     =   3 SECS;
+static unsigned long ip_ct_sctp_timeout_established       =   5 DAYS;
+static unsigned long ip_ct_sctp_timeout_shutdown_sent     = 300 SECS / 1000;
+static unsigned long ip_ct_sctp_timeout_shutdown_recd     = 300 SECS / 1000;
+static unsigned long ip_ct_sctp_timeout_shutdown_ack_sent =   3 SECS;
+
+static unsigned long * sctp_timeouts[]
+= { NULL,                                  /* SCTP_CONNTRACK_NONE  */
+    &ip_ct_sctp_timeout_closed,	           /* SCTP_CONNTRACK_CLOSED */
+    &ip_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
+    &ip_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
+    &ip_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
+    &ip_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
+    &ip_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
+    &ip_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
+ };
+
+#define sNO SCTP_CONNTRACK_NONE
+#define	sCL SCTP_CONNTRACK_CLOSED
+#define	sCW SCTP_CONNTRACK_COOKIE_WAIT
+#define	sCE SCTP_CONNTRACK_COOKIE_ECHOED
+#define	sES SCTP_CONNTRACK_ESTABLISHED
+#define	sSS SCTP_CONNTRACK_SHUTDOWN_SENT
+#define	sSR SCTP_CONNTRACK_SHUTDOWN_RECD
+#define	sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
+#define	sIV SCTP_CONNTRACK_MAX
+
+/* 
+	These are the descriptions of the states:
+
+NOTE: These state names are tantalizingly similar to the states of an 
+SCTP endpoint. But the interpretation of the states is a little different,
+considering that these are the states of the connection and not of an end 
+point. Please note the subtleties. -Kiran
+
+NONE              - Nothing so far.
+COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also 
+                    an INIT_ACK chunk in the reply direction.
+COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
+ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
+SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
+SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
+SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
+                    to that of the SHUTDOWN chunk.
+CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of 
+                    the SHUTDOWN chunk. Connection is closed.
+*/
+
+/* TODO
+ - I have assumed that the first INIT is in the original direction. 
+ This messes things when an INIT comes in the reply direction in CLOSED
+ state.
+ - Check the error type in the reply dir before transitioning from 
+cookie echoed to closed.
+ - Sec 5.2.4 of RFC 2960
+ - Multi Homing support.
+*/
+
+/* SCTP conntrack state transitions */
+static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
+	{
+/*	ORIGINAL	*/
+/*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
+/* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
+/* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
+/* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
+/* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
+/* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
+/* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
+/* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
+/* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
+/* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
+	},
+	{
+/*	REPLY	*/
+/*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
+/* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
+/* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
+/* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
+/* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
+/* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
+/* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
+/* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
+/* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
+/* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
+	}
+};
+
+static int sctp_pkt_to_tuple(const struct sk_buff *skb,
+			     unsigned int dataoff,
+			     struct ip_conntrack_tuple *tuple)
+{
+	sctp_sctphdr_t _hdr, *hp;
+
+	DEBUGP(__FUNCTION__);
+	DEBUGP("\n");
+
+	/* Actually only need first 8 bytes. */
+	hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
+	if (hp == NULL)
+		return 0;
+
+	tuple->src.u.sctp.port = hp->source;
+	tuple->dst.u.sctp.port = hp->dest;
+	return 1;
+}
+
+static int sctp_invert_tuple(struct ip_conntrack_tuple *tuple,
+			     const struct ip_conntrack_tuple *orig)
+{
+	DEBUGP(__FUNCTION__);
+	DEBUGP("\n");
+
+	tuple->src.u.sctp.port = orig->dst.u.sctp.port;
+	tuple->dst.u.sctp.port = orig->src.u.sctp.port;
+	return 1;
+}
+
+/* Print out the per-protocol part of the tuple. */
+static int sctp_print_tuple(struct seq_file *s,
+			    const struct ip_conntrack_tuple *tuple)
+{
+	DEBUGP(__FUNCTION__);
+	DEBUGP("\n");
+
+	return seq_printf(s, "sport=%hu dport=%hu ",
+			  ntohs(tuple->src.u.sctp.port),
+			  ntohs(tuple->dst.u.sctp.port));
+}
+
+/* Print out the private part of the conntrack. */
+static int sctp_print_conntrack(struct seq_file *s,
+				const struct ip_conntrack *conntrack)
+{
+	enum sctp_conntrack state;
+
+	DEBUGP(__FUNCTION__);
+	DEBUGP("\n");
+
+	READ_LOCK(&sctp_lock);
+	state = conntrack->proto.sctp.state;
+	READ_UNLOCK(&sctp_lock);
+
+	return seq_printf(s, "%s ", sctp_conntrack_names[state]);
+}
+
+#define for_each_sctp_chunk(skb, sch, _sch, offset, count)		\
+for (offset = skb->nh.iph->ihl * 4 + sizeof(sctp_sctphdr_t), count = 0;	\
+	offset < skb->len &&						\
+	(sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));	\
+	offset += (htons(sch->length) + 3) & ~3, count++)
+
+/* Some validity checks to make sure the chunks are fine */
+static int do_basic_checks(struct ip_conntrack *conntrack,
+			   const struct sk_buff *skb,
+			   char *map)
+{
+	u_int32_t offset, count;
+	sctp_chunkhdr_t _sch, *sch;
+	int flag;
+
+	DEBUGP(__FUNCTION__);
+	DEBUGP("\n");
+
+	flag = 0;
+
+	for_each_sctp_chunk (skb, sch, _sch, offset, count) {
+		DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
+
+		if (sch->type == SCTP_CID_INIT 
+			|| sch->type == SCTP_CID_INIT_ACK
+			|| sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
+			flag = 1;
+		}
+
+		/* Cookie Ack/Echo chunks not the first OR 
+		   Init / Init Ack / Shutdown compl chunks not the only chunks */
+		if ((sch->type == SCTP_CID_COOKIE_ACK 
+			|| sch->type == SCTP_CID_COOKIE_ECHO
+			|| flag)
+		     && count !=0 ) {
+			DEBUGP("Basic checks failed\n");
+			return 1;
+		}
+
+		if (map) {
+			set_bit(sch->type, (void *)map);
+		}
+	}
+
+	DEBUGP("Basic checks passed\n");
+	return 0;
+}
+
+static int new_state(enum ip_conntrack_dir dir,
+		     enum sctp_conntrack cur_state,
+		     int chunk_type)
+{
+	int i;
+
+	DEBUGP(__FUNCTION__);
+	DEBUGP("\n");
+
+	DEBUGP("Chunk type: %d\n", chunk_type);
+
+	switch (chunk_type) {
+		case SCTP_CID_INIT: 
+			DEBUGP("SCTP_CID_INIT\n");
+			i = 0; break;
+		case SCTP_CID_INIT_ACK: 
+			DEBUGP("SCTP_CID_INIT_ACK\n");
+			i = 1; break;
+		case SCTP_CID_ABORT: 
+			DEBUGP("SCTP_CID_ABORT\n");
+			i = 2; break;
+		case SCTP_CID_SHUTDOWN: 
+			DEBUGP("SCTP_CID_SHUTDOWN\n");
+			i = 3; break;
+		case SCTP_CID_SHUTDOWN_ACK: 
+			DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
+			i = 4; break;
+		case SCTP_CID_ERROR: 
+			DEBUGP("SCTP_CID_ERROR\n");
+			i = 5; break;
+		case SCTP_CID_COOKIE_ECHO: 
+			DEBUGP("SCTP_CID_COOKIE_ECHO\n");
+			i = 6; break;
+		case SCTP_CID_COOKIE_ACK: 
+			DEBUGP("SCTP_CID_COOKIE_ACK\n");
+			i = 7; break;
+		case SCTP_CID_SHUTDOWN_COMPLETE: 
+			DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
+			i = 8; break;
+		default:
+			/* Other chunks like DATA, SACK, HEARTBEAT and
+			its ACK do not cause a change in state */
+			DEBUGP("Unknown chunk type, Will stay in %s\n", 
+						sctp_conntrack_names[cur_state]);
+			return cur_state;
+	}
+
+	DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n", 
+			dir, sctp_conntrack_names[cur_state], chunk_type,
+			sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
+
+	return sctp_conntracks[dir][i][cur_state];
+}
+
+/* Returns verdict for packet, or -1 for invalid. */
+static int sctp_packet(struct ip_conntrack *conntrack,
+		       const struct sk_buff *skb,
+		       enum ip_conntrack_info ctinfo)
+{
+	enum sctp_conntrack newconntrack, oldsctpstate;
+	struct iphdr *iph = skb->nh.iph;
+	sctp_sctphdr_t _sctph, *sh;
+	sctp_chunkhdr_t _sch, *sch;
+	u_int32_t offset, count;
+	char map[256 / sizeof (char)] = {0};
+
+	DEBUGP(__FUNCTION__);
+	DEBUGP("\n");
+
+	sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
+	if (sh == NULL)
+		return -1;
+
+	if (do_basic_checks(conntrack, skb, map) != 0)
+		return -1;
+
+	/* Check the verification tag (Sec 8.5) */
+	if (!test_bit(SCTP_CID_INIT, (void *)map)
+		&& !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
+		&& !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
+		&& !test_bit(SCTP_CID_ABORT, (void *)map)
+		&& !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
+		&& (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
+		DEBUGP("Verification tag check failed\n");
+		return -1;
+	}
+
+	oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
+	for_each_sctp_chunk (skb, sch, _sch, offset, count) {
+		WRITE_LOCK(&sctp_lock);
+
+		/* Special cases of Verification tag check (Sec 8.5.1) */
+		if (sch->type == SCTP_CID_INIT) {
+			/* Sec 8.5.1 (A) */
+			if (sh->vtag != 0) {
+				WRITE_UNLOCK(&sctp_lock);
+				return -1;
+			}
+		} else if (sch->type == SCTP_CID_ABORT) {
+			/* Sec 8.5.1 (B) */
+			if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
+				&& !(sh->vtag == conntrack->proto.sctp.vtag
+							[1 - CTINFO2DIR(ctinfo)])) {
+				WRITE_UNLOCK(&sctp_lock);
+				return -1;
+			}
+		} else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
+			/* Sec 8.5.1 (C) */
+			if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
+				&& !(sh->vtag == conntrack->proto.sctp.vtag
+							[1 - CTINFO2DIR(ctinfo)] 
+					&& (sch->flags & 1))) {
+				WRITE_UNLOCK(&sctp_lock);
+				return -1;
+			}
+		} else if (sch->type == SCTP_CID_COOKIE_ECHO) {
+			/* Sec 8.5.1 (D) */
+			if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
+				WRITE_UNLOCK(&sctp_lock);
+				return -1;
+			}
+		}
+
+		oldsctpstate = conntrack->proto.sctp.state;
+		newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
+
+		/* Invalid */
+		if (newconntrack == SCTP_CONNTRACK_MAX) {
+			DEBUGP("ip_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
+			       CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
+			WRITE_UNLOCK(&sctp_lock);
+			return -1;
+		}
+
+		/* If it is an INIT or an INIT ACK note down the vtag */
+		if (sch->type == SCTP_CID_INIT 
+			|| sch->type == SCTP_CID_INIT_ACK) {
+			sctp_inithdr_t _inithdr, *ih;
+
+			ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
+			                        sizeof(_inithdr), &_inithdr);
+			if (ih == NULL) {
+					WRITE_UNLOCK(&sctp_lock);
+					return -1;
+			}
+			DEBUGP("Setting vtag %x for dir %d\n", 
+					ih->init_tag, !CTINFO2DIR(ctinfo));
+			conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
+		}
+
+		conntrack->proto.sctp.state = newconntrack;
+		WRITE_UNLOCK(&sctp_lock);
+	}
+
+	ip_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
+
+	if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
+		&& CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
+		&& newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
+		DEBUGP("Setting assured bit\n");
+		set_bit(IPS_ASSURED_BIT, &conntrack->status);
+	}
+
+	return NF_ACCEPT;
+}
+
+/* Called when a new connection for this protocol found. */
+static int sctp_new(struct ip_conntrack *conntrack, 
+		    const struct sk_buff *skb)
+{
+	enum sctp_conntrack newconntrack;
+	struct iphdr *iph = skb->nh.iph;
+	sctp_sctphdr_t _sctph, *sh;
+	sctp_chunkhdr_t _sch, *sch;
+	u_int32_t offset, count;
+	char map[256 / sizeof (char)] = {0};
+
+	DEBUGP(__FUNCTION__);
+	DEBUGP("\n");
+
+	sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
+	if (sh == NULL)
+		return 0;
+
+	if (do_basic_checks(conntrack, skb, map) != 0)
+		return 0;
+
+	/* If an OOTB packet has any of these chunks discard (Sec 8.4) */
+	if ((test_bit (SCTP_CID_ABORT, (void *)map))
+		|| (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
+		|| (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
+		return 0;
+	}
+
+	newconntrack = SCTP_CONNTRACK_MAX;
+	for_each_sctp_chunk (skb, sch, _sch, offset, count) {
+		/* Don't need lock here: this conntrack not in circulation yet */
+		newconntrack = new_state (IP_CT_DIR_ORIGINAL, 
+						SCTP_CONNTRACK_NONE, sch->type);
+
+		/* Invalid: delete conntrack */
+		if (newconntrack == SCTP_CONNTRACK_MAX) {
+			DEBUGP("ip_conntrack_sctp: invalid new deleting.\n");
+			return 0;
+		}
+
+		/* Copy the vtag into the state info */
+		if (sch->type == SCTP_CID_INIT) {
+			if (sh->vtag == 0) {
+				sctp_inithdr_t _inithdr, *ih;
+
+				ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
+				                        sizeof(_inithdr), &_inithdr);
+				if (ih == NULL)
+					return 0;
+
+				DEBUGP("Setting vtag %x for new conn\n", 
+					ih->init_tag);
+
+				conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = 
+								ih->init_tag;
+			} else {
+				/* Sec 8.5.1 (A) */
+				return 0;
+			}
+		}
+		/* If it is a shutdown ack OOTB packet, we expect a return
+		   shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
+		else {
+			DEBUGP("Setting vtag %x for new conn OOTB\n", 
+				sh->vtag);
+			conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
+		}
+
+		conntrack->proto.sctp.state = newconntrack;
+	}
+
+	return 1;
+}
+
+static struct ip_conntrack_protocol ip_conntrack_protocol_sctp = { 
+	.proto 		 = IPPROTO_SCTP, 
+	.name 		 = "sctp",
+	.pkt_to_tuple 	 = sctp_pkt_to_tuple, 
+	.invert_tuple 	 = sctp_invert_tuple, 
+	.print_tuple 	 = sctp_print_tuple, 
+	.print_conntrack = sctp_print_conntrack,
+	.packet 	 = sctp_packet, 
+	.new 		 = sctp_new, 
+	.destroy 	 = NULL, 
+	.me 		 = THIS_MODULE 
+};
+
+#ifdef CONFIG_SYSCTL
+static ctl_table ip_ct_sysctl_table[] = {
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
+		.procname	= "ip_conntrack_sctp_timeout_closed",
+		.data		= &ip_ct_sctp_timeout_closed,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
+		.procname	= "ip_conntrack_sctp_timeout_cookie_wait",
+		.data		= &ip_ct_sctp_timeout_cookie_wait,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
+		.procname	= "ip_conntrack_sctp_timeout_cookie_echoed",
+		.data		= &ip_ct_sctp_timeout_cookie_echoed,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
+		.procname	= "ip_conntrack_sctp_timeout_established",
+		.data		= &ip_ct_sctp_timeout_established,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
+		.procname	= "ip_conntrack_sctp_timeout_shutdown_sent",
+		.data		= &ip_ct_sctp_timeout_shutdown_sent,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
+		.procname	= "ip_conntrack_sctp_timeout_shutdown_recd",
+		.data		= &ip_ct_sctp_timeout_shutdown_recd,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
+		.procname	= "ip_conntrack_sctp_timeout_shutdown_ack_sent",
+		.data		= &ip_ct_sctp_timeout_shutdown_ack_sent,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table ip_ct_netfilter_table[] = {
+	{
+		.ctl_name	= NET_IPV4_NETFILTER,
+		.procname	= "netfilter",
+		.mode		= 0555,
+		.child		= ip_ct_sysctl_table,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table ip_ct_ipv4_table[] = {
+	{
+		.ctl_name	= NET_IPV4,
+		.procname	= "ipv4",
+		.mode		= 0555,
+		.child		= ip_ct_netfilter_table,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table ip_ct_net_table[] = {
+	{
+		.ctl_name	= CTL_NET,
+		.procname	= "net",
+		.mode		= 0555, 
+		.child		= ip_ct_ipv4_table,
+	},
+	{ .ctl_name = 0 }
+};
+
+static struct ctl_table_header *ip_ct_sysctl_header;
+#endif
+
+static int __init init(void)
+{
+	int ret;
+
+	ret = ip_conntrack_protocol_register(&ip_conntrack_protocol_sctp);
+	if (ret) {
+		printk("ip_conntrack_proto_sctp: protocol register failed\n");
+		goto out;
+	}
+
+#ifdef CONFIG_SYSCTL
+	ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
+	if (ip_ct_sysctl_header == NULL) {
+		ret = -ENOMEM;
+		printk("ip_conntrack_proto_sctp: can't register to sysctl.\n");
+		goto cleanup;
+	}
+#endif
+
+	return ret;
+
+#ifdef CONFIG_SYSCTL
+ cleanup:
+	ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
+#endif
+ out:
+	DEBUGP("SCTP conntrack module loading %s\n", 
+					ret ? "failed": "succeeded");
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
+#ifdef CONFIG_SYSCTL
+ 	unregister_sysctl_table(ip_ct_sysctl_header);
+#endif
+	DEBUGP("SCTP conntrack module unloaded\n");
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kiran Kumar Immidi");
+MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
new file mode 100644
index 000000000000..e800b16fc920
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
@@ -0,0 +1,1098 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>:
+ *	- Real stateful connection tracking
+ *	- Modified state transitions table
+ *	- Window scaling support added
+ *	- SACK support added
+ *
+ * Willy Tarreau:
+ *	- State table bugfixes
+ *	- More robust state changes
+ *	- Tuning timer parameters
+ *
+ * version 2.2
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/netfilter.h>
+#include <linux/module.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/spinlock.h>
+
+#include <net/tcp.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+#include <linux/netfilter_ipv4/lockhelp.h>
+
+#if 0
+#define DEBUGP printk
+#define DEBUGP_VARS
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* Protects conntrack->proto.tcp */
+static DECLARE_RWLOCK(tcp_lock);
+
+/* "Be conservative in what you do, 
+    be liberal in what you accept from others." 
+    If it's non-zero, we mark only out of window RST segments as INVALID. */
+int ip_ct_tcp_be_liberal = 0;
+
+/* When connection is picked up from the middle, how many packets are required
+   to pass in each direction when we assume we are in sync - if any side uses
+   window scaling, we lost the game. 
+   If it is set to zero, we disable picking up already established 
+   connections. */
+int ip_ct_tcp_loose = 3;
+
+/* Max number of the retransmitted packets without receiving an (acceptable) 
+   ACK from the destination. If this number is reached, a shorter timer 
+   will be started. */
+int ip_ct_tcp_max_retrans = 3;
+
+  /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
+     closely.  They're more complex. --RR */
+
+static const char *tcp_conntrack_names[] = {
+	"NONE",
+	"SYN_SENT",
+	"SYN_RECV",
+	"ESTABLISHED",
+	"FIN_WAIT",
+	"CLOSE_WAIT",
+	"LAST_ACK",
+	"TIME_WAIT",
+	"CLOSE",
+	"LISTEN"
+};
+  
+#define SECS * HZ
+#define MINS * 60 SECS
+#define HOURS * 60 MINS
+#define DAYS * 24 HOURS
+
+unsigned long ip_ct_tcp_timeout_syn_sent =      2 MINS;
+unsigned long ip_ct_tcp_timeout_syn_recv =     60 SECS;
+unsigned long ip_ct_tcp_timeout_established =   5 DAYS;
+unsigned long ip_ct_tcp_timeout_fin_wait =      2 MINS;
+unsigned long ip_ct_tcp_timeout_close_wait =   60 SECS;
+unsigned long ip_ct_tcp_timeout_last_ack =     30 SECS;
+unsigned long ip_ct_tcp_timeout_time_wait =     2 MINS;
+unsigned long ip_ct_tcp_timeout_close =        10 SECS;
+
+/* RFC1122 says the R2 limit should be at least 100 seconds.
+   Linux uses 15 packets as limit, which corresponds 
+   to ~13-30min depending on RTO. */
+unsigned long ip_ct_tcp_timeout_max_retrans =     5 MINS;
+ 
+static unsigned long * tcp_timeouts[]
+= { NULL,                              /*      TCP_CONNTRACK_NONE */
+    &ip_ct_tcp_timeout_syn_sent,       /*      TCP_CONNTRACK_SYN_SENT, */
+    &ip_ct_tcp_timeout_syn_recv,       /*      TCP_CONNTRACK_SYN_RECV, */
+    &ip_ct_tcp_timeout_established,    /*      TCP_CONNTRACK_ESTABLISHED,      */
+    &ip_ct_tcp_timeout_fin_wait,       /*      TCP_CONNTRACK_FIN_WAIT, */
+    &ip_ct_tcp_timeout_close_wait,     /*      TCP_CONNTRACK_CLOSE_WAIT,       */
+    &ip_ct_tcp_timeout_last_ack,       /*      TCP_CONNTRACK_LAST_ACK, */
+    &ip_ct_tcp_timeout_time_wait,      /*      TCP_CONNTRACK_TIME_WAIT,        */
+    &ip_ct_tcp_timeout_close,          /*      TCP_CONNTRACK_CLOSE,    */
+    NULL,                              /*      TCP_CONNTRACK_LISTEN */
+ };
+ 
+#define sNO TCP_CONNTRACK_NONE
+#define sSS TCP_CONNTRACK_SYN_SENT
+#define sSR TCP_CONNTRACK_SYN_RECV
+#define sES TCP_CONNTRACK_ESTABLISHED
+#define sFW TCP_CONNTRACK_FIN_WAIT
+#define sCW TCP_CONNTRACK_CLOSE_WAIT
+#define sLA TCP_CONNTRACK_LAST_ACK
+#define sTW TCP_CONNTRACK_TIME_WAIT
+#define sCL TCP_CONNTRACK_CLOSE
+#define sLI TCP_CONNTRACK_LISTEN
+#define sIV TCP_CONNTRACK_MAX
+#define sIG TCP_CONNTRACK_IGNORE
+
+/* What TCP flags are set from RST/SYN/FIN/ACK. */
+enum tcp_bit_set {
+	TCP_SYN_SET,
+	TCP_SYNACK_SET,
+	TCP_FIN_SET,
+	TCP_ACK_SET,
+	TCP_RST_SET,
+	TCP_NONE_SET,
+};
+  
+/*
+ * The TCP state transition table needs a few words...
+ *
+ * We are the man in the middle. All the packets go through us
+ * but might get lost in transit to the destination.
+ * It is assumed that the destinations can't receive segments 
+ * we haven't seen.
+ *
+ * The checked segment is in window, but our windows are *not*
+ * equivalent with the ones of the sender/receiver. We always
+ * try to guess the state of the current sender.
+ *
+ * The meaning of the states are:
+ *
+ * NONE:	initial state
+ * SYN_SENT:	SYN-only packet seen 
+ * SYN_RECV:	SYN-ACK packet seen
+ * ESTABLISHED:	ACK packet seen
+ * FIN_WAIT:	FIN packet seen
+ * CLOSE_WAIT:	ACK seen (after FIN) 
+ * LAST_ACK:	FIN seen (after FIN)
+ * TIME_WAIT:	last ACK seen
+ * CLOSE:	closed connection
+ *
+ * LISTEN state is not used.
+ *
+ * Packets marked as IGNORED (sIG):
+ *	if they may be either invalid or valid 
+ *	and the receiver may send back a connection 
+ *	closing RST or a SYN/ACK.
+ *
+ * Packets marked as INVALID (sIV):
+ *	if they are invalid
+ *	or we do not support the request (simultaneous open)
+ */
+static enum tcp_conntrack tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = {
+	{
+/* ORIGINAL */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*syn*/	   { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sIV },
+/*
+ *	sNO -> sSS	Initialize a new connection
+ *	sSS -> sSS	Retransmitted SYN
+ *	sSR -> sIG	Late retransmitted SYN?
+ *	sES -> sIG	Error: SYNs in window outside the SYN_SENT state
+ *			are errors. Receiver will reply with RST 
+ *			and close the connection.
+ *			Or we are not in sync and hold a dead connection.
+ *	sFW -> sIG
+ *	sCW -> sIG
+ *	sLA -> sIG
+ *	sTW -> sSS	Reopened connection (RFC 1122).
+ *	sCL -> sSS
+ */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*synack*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV },
+/*
+ * A SYN/ACK from the client is always invalid:
+ *	- either it tries to set up a simultaneous open, which is 
+ *	  not supported;
+ *	- or the firewall has just been inserted between the two hosts
+ *	  during the session set-up. The SYN will be retransmitted 
+ *	  by the true client (or it'll time out).
+ */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*fin*/    { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV },
+/*
+ *	sNO -> sIV	Too late and no reason to do anything...
+ *	sSS -> sIV	Client migth not send FIN in this state:
+ *			we enforce waiting for a SYN/ACK reply first.
+ *	sSR -> sFW	Close started.
+ *	sES -> sFW	
+ *	sFW -> sLA	FIN seen in both directions, waiting for
+ *			the last ACK. 
+ *			Migth be a retransmitted FIN as well...
+ *	sCW -> sLA
+ *	sLA -> sLA	Retransmitted FIN. Remain in the same state.
+ *	sTW -> sTW
+ *	sCL -> sCL
+ */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*ack*/	   { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV },
+/*
+ *	sNO -> sES	Assumed.
+ *	sSS -> sIV	ACK is invalid: we haven't seen a SYN/ACK yet.
+ *	sSR -> sES	Established state is reached.
+ *	sES -> sES	:-)
+ *	sFW -> sCW	Normal close request answered by ACK.
+ *	sCW -> sCW
+ *	sLA -> sTW	Last ACK detected.
+ *	sTW -> sTW	Retransmitted last ACK. Remain in the same state.
+ *	sCL -> sCL
+ */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*rst*/    { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV },
+/*none*/   { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }
+	},
+	{
+/* REPLY */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*syn*/	   { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV },
+/*
+ *	sNO -> sIV	Never reached.
+ *	sSS -> sIV	Simultaneous open, not supported
+ *	sSR -> sIV	Simultaneous open, not supported.
+ *	sES -> sIV	Server may not initiate a connection.
+ *	sFW -> sIV
+ *	sCW -> sIV
+ *	sLA -> sIV
+ *	sTW -> sIV	Reopened connection, but server may not do it.
+ *	sCL -> sIV
+ */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIV },
+/*
+ *	sSS -> sSR	Standard open.
+ *	sSR -> sSR	Retransmitted SYN/ACK.
+ *	sES -> sIG	Late retransmitted SYN/ACK?
+ *	sFW -> sIG	Might be SYN/ACK answering ignored SYN
+ *	sCW -> sIG
+ *	sLA -> sIG
+ *	sTW -> sIG
+ *	sCL -> sIG
+ */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*fin*/    { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV },
+/*
+ *	sSS -> sIV	Server might not send FIN in this state.
+ *	sSR -> sFW	Close started.
+ *	sES -> sFW
+ *	sFW -> sLA	FIN seen in both directions.
+ *	sCW -> sLA
+ *	sLA -> sLA	Retransmitted FIN.
+ *	sTW -> sTW
+ *	sCL -> sCL
+ */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*ack*/	   { sIV, sIV, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
+/*
+ *	sSS -> sIV	Might be a half-open connection.
+ *	sSR -> sSR	Might answer late resent SYN.
+ *	sES -> sES	:-)
+ *	sFW -> sCW	Normal close request answered by ACK.
+ *	sCW -> sCW
+ *	sLA -> sTW	Last ACK detected.
+ *	sTW -> sTW	Retransmitted last ACK.
+ *	sCL -> sCL
+ */
+/* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
+/*rst*/    { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV },
+/*none*/   { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }
+  	}
+};
+
+static int tcp_pkt_to_tuple(const struct sk_buff *skb,
+			    unsigned int dataoff,
+			    struct ip_conntrack_tuple *tuple)
+{
+	struct tcphdr _hdr, *hp;
+
+	/* Actually only need first 8 bytes. */
+	hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
+	if (hp == NULL)
+		return 0;
+
+	tuple->src.u.tcp.port = hp->source;
+	tuple->dst.u.tcp.port = hp->dest;
+
+	return 1;
+}
+
+static int tcp_invert_tuple(struct ip_conntrack_tuple *tuple,
+			    const struct ip_conntrack_tuple *orig)
+{
+	tuple->src.u.tcp.port = orig->dst.u.tcp.port;
+	tuple->dst.u.tcp.port = orig->src.u.tcp.port;
+	return 1;
+}
+
+/* Print out the per-protocol part of the tuple. */
+static int tcp_print_tuple(struct seq_file *s,
+			   const struct ip_conntrack_tuple *tuple)
+{
+	return seq_printf(s, "sport=%hu dport=%hu ",
+			  ntohs(tuple->src.u.tcp.port),
+			  ntohs(tuple->dst.u.tcp.port));
+}
+
+/* Print out the private part of the conntrack. */
+static int tcp_print_conntrack(struct seq_file *s,
+			       const struct ip_conntrack *conntrack)
+{
+	enum tcp_conntrack state;
+
+	READ_LOCK(&tcp_lock);
+	state = conntrack->proto.tcp.state;
+	READ_UNLOCK(&tcp_lock);
+
+	return seq_printf(s, "%s ", tcp_conntrack_names[state]);
+}
+
+static unsigned int get_conntrack_index(const struct tcphdr *tcph)
+{
+	if (tcph->rst) return TCP_RST_SET;
+	else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET);
+	else if (tcph->fin) return TCP_FIN_SET;
+	else if (tcph->ack) return TCP_ACK_SET;
+	else return TCP_NONE_SET;
+}
+
+/* TCP connection tracking based on 'Real Stateful TCP Packet Filtering
+   in IP Filter' by Guido van Rooij.
+   
+   http://www.nluug.nl/events/sane2000/papers.html
+   http://www.iae.nl/users/guido/papers/tcp_filtering.ps.gz
+   
+   The boundaries and the conditions are changed according to RFC793:
+   the packet must intersect the window (i.e. segments may be
+   after the right or before the left edge) and thus receivers may ACK
+   segments after the right edge of the window.
+
+   	td_maxend = max(sack + max(win,1)) seen in reply packets
+	td_maxwin = max(max(win, 1)) + (sack - ack) seen in sent packets
+	td_maxwin += seq + len - sender.td_maxend
+			if seq + len > sender.td_maxend
+	td_end    = max(seq + len) seen in sent packets
+   
+   I.   Upper bound for valid data:	seq <= sender.td_maxend
+   II.  Lower bound for valid data:	seq + len >= sender.td_end - receiver.td_maxwin
+   III.	Upper bound for valid ack:      sack <= receiver.td_end
+   IV.	Lower bound for valid ack:	ack >= receiver.td_end - MAXACKWINDOW
+   	
+   where sack is the highest right edge of sack block found in the packet.
+   	
+   The upper bound limit for a valid ack is not ignored - 
+   we doesn't have to deal with fragments. 
+*/
+
+static inline __u32 segment_seq_plus_len(__u32 seq,
+					 size_t len,
+					 struct iphdr *iph,
+					 struct tcphdr *tcph)
+{
+	return (seq + len - (iph->ihl + tcph->doff)*4
+		+ (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0));
+}
+  
+/* Fixme: what about big packets? */
+#define MAXACKWINCONST			66000
+#define MAXACKWINDOW(sender)						\
+	((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin	\
+					      : MAXACKWINCONST)
+  
+/*
+ * Simplified tcp_parse_options routine from tcp_input.c
+ */
+static void tcp_options(const struct sk_buff *skb,
+			struct iphdr *iph,
+			struct tcphdr *tcph, 
+			struct ip_ct_tcp_state *state)
+{
+	unsigned char buff[(15 * 4) - sizeof(struct tcphdr)];
+	unsigned char *ptr;
+	int length = (tcph->doff*4) - sizeof(struct tcphdr);
+	
+	if (!length)
+		return;
+
+	ptr = skb_header_pointer(skb,
+				 (iph->ihl * 4) + sizeof(struct tcphdr),
+				 length, buff);
+	BUG_ON(ptr == NULL);
+
+	state->td_scale = 
+	state->flags = 0;
+	
+	while (length > 0) {
+		int opcode=*ptr++;
+		int opsize;
+		
+		switch (opcode) {
+		case TCPOPT_EOL:
+			return;
+		case TCPOPT_NOP:	/* Ref: RFC 793 section 3.1 */
+			length--;
+			continue;
+		default:
+			opsize=*ptr++;
+			if (opsize < 2) /* "silly options" */
+				return;
+			if (opsize > length)
+				break;	/* don't parse partial options */
+
+			if (opcode == TCPOPT_SACK_PERM 
+			    && opsize == TCPOLEN_SACK_PERM)
+				state->flags |= IP_CT_TCP_FLAG_SACK_PERM;
+			else if (opcode == TCPOPT_WINDOW
+				 && opsize == TCPOLEN_WINDOW) {
+				state->td_scale = *(u_int8_t *)ptr;
+				
+				if (state->td_scale > 14) {
+					/* See RFC1323 */
+					state->td_scale = 14;
+				}
+				state->flags |=
+					IP_CT_TCP_FLAG_WINDOW_SCALE;
+			}
+			ptr += opsize - 2;
+			length -= opsize;
+		}
+	}
+}
+
+static void tcp_sack(const struct sk_buff *skb,
+		     struct iphdr *iph,
+		     struct tcphdr *tcph,
+		     __u32 *sack)
+{
+	unsigned char buff[(15 * 4) - sizeof(struct tcphdr)];
+	unsigned char *ptr;
+	int length = (tcph->doff*4) - sizeof(struct tcphdr);
+	__u32 tmp;
+
+	if (!length)
+		return;
+
+	ptr = skb_header_pointer(skb,
+				 (iph->ihl * 4) + sizeof(struct tcphdr),
+				 length, buff);
+	BUG_ON(ptr == NULL);
+
+	/* Fast path for timestamp-only option */
+	if (length == TCPOLEN_TSTAMP_ALIGNED*4
+	    && *(__u32 *)ptr ==
+	        __constant_ntohl((TCPOPT_NOP << 24) 
+	        		 | (TCPOPT_NOP << 16)
+	        		 | (TCPOPT_TIMESTAMP << 8)
+	        		 | TCPOLEN_TIMESTAMP))
+		return;
+		
+	while (length > 0) {
+		int opcode=*ptr++;
+		int opsize, i;
+		
+		switch (opcode) {
+		case TCPOPT_EOL:
+			return;
+		case TCPOPT_NOP:	/* Ref: RFC 793 section 3.1 */
+			length--;
+			continue;
+		default:
+			opsize=*ptr++;
+			if (opsize < 2) /* "silly options" */
+				return;
+			if (opsize > length)
+				break;	/* don't parse partial options */
+
+			if (opcode == TCPOPT_SACK 
+			    && opsize >= (TCPOLEN_SACK_BASE 
+			    		  + TCPOLEN_SACK_PERBLOCK)
+			    && !((opsize - TCPOLEN_SACK_BASE) 
+			    	 % TCPOLEN_SACK_PERBLOCK)) {
+			    	for (i = 0;
+			    	     i < (opsize - TCPOLEN_SACK_BASE);
+			    	     i += TCPOLEN_SACK_PERBLOCK) {
+					tmp = ntohl(*((u_int32_t *)(ptr+i)+1));
+					
+					if (after(tmp, *sack))
+						*sack = tmp;
+				}
+				return;
+			}
+			ptr += opsize - 2;
+			length -= opsize;
+		}
+	}
+}
+
+static int tcp_in_window(struct ip_ct_tcp *state, 
+                         enum ip_conntrack_dir dir,
+                         unsigned int index,
+                         const struct sk_buff *skb,
+                         struct iphdr *iph,
+                         struct tcphdr *tcph)
+{
+	struct ip_ct_tcp_state *sender = &state->seen[dir];
+	struct ip_ct_tcp_state *receiver = &state->seen[!dir];
+	__u32 seq, ack, sack, end, win, swin;
+	int res;
+	
+	/*
+	 * Get the required data from the packet.
+	 */
+	seq = ntohl(tcph->seq);
+	ack = sack = ntohl(tcph->ack_seq);
+	win = ntohs(tcph->window);
+	end = segment_seq_plus_len(seq, skb->len, iph, tcph);
+	
+	if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM)
+		tcp_sack(skb, iph, tcph, &sack);
+		
+	DEBUGP("tcp_in_window: START\n");
+	DEBUGP("tcp_in_window: src=%u.%u.%u.%u:%hu dst=%u.%u.%u.%u:%hu "
+	       "seq=%u ack=%u sack=%u win=%u end=%u\n",
+		NIPQUAD(iph->saddr), ntohs(tcph->source), 
+		NIPQUAD(iph->daddr), ntohs(tcph->dest),
+		seq, ack, sack, win, end);
+	DEBUGP("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
+	       "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
+		sender->td_end, sender->td_maxend, sender->td_maxwin,
+		sender->td_scale, 
+		receiver->td_end, receiver->td_maxend, receiver->td_maxwin, 
+		receiver->td_scale);
+		
+	if (sender->td_end == 0) {
+		/*
+		 * Initialize sender data.
+		 */
+		if (tcph->syn && tcph->ack) {
+			/*
+			 * Outgoing SYN-ACK in reply to a SYN.
+			 */
+			sender->td_end = 
+			sender->td_maxend = end;
+			sender->td_maxwin = (win == 0 ? 1 : win);
+
+			tcp_options(skb, iph, tcph, sender);
+			/* 
+			 * RFC 1323:
+			 * Both sides must send the Window Scale option
+			 * to enable window scaling in either direction.
+			 */
+			if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE
+			      && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE))
+				sender->td_scale = 
+				receiver->td_scale = 0;
+		} else {
+			/*
+			 * We are in the middle of a connection,
+			 * its history is lost for us.
+			 * Let's try to use the data from the packet.
+		 	 */
+			sender->td_end = end;
+			sender->td_maxwin = (win == 0 ? 1 : win);
+			sender->td_maxend = end + sender->td_maxwin;
+		}
+	} else if (((state->state == TCP_CONNTRACK_SYN_SENT
+		     && dir == IP_CT_DIR_ORIGINAL)
+		    || (state->state == TCP_CONNTRACK_SYN_RECV
+		        && dir == IP_CT_DIR_REPLY))
+		    && after(end, sender->td_end)) {
+		/*
+		 * RFC 793: "if a TCP is reinitialized ... then it need
+		 * not wait at all; it must only be sure to use sequence 
+		 * numbers larger than those recently used."
+		 */
+		sender->td_end =
+		sender->td_maxend = end;
+		sender->td_maxwin = (win == 0 ? 1 : win);
+
+		tcp_options(skb, iph, tcph, sender);
+	}
+	
+	if (!(tcph->ack)) {
+		/*
+		 * If there is no ACK, just pretend it was set and OK.
+		 */
+		ack = sack = receiver->td_end;
+	} else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) == 
+		    (TCP_FLAG_ACK|TCP_FLAG_RST)) 
+		   && (ack == 0)) {
+		/*
+		 * Broken TCP stacks, that set ACK in RST packets as well
+		 * with zero ack value.
+		 */
+		ack = sack = receiver->td_end;
+	}
+
+	if (seq == end
+	    && (!tcph->rst 
+	        || (seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT)))
+		/*
+		 * Packets contains no data: we assume it is valid
+		 * and check the ack value only.
+		 * However RST segments are always validated by their
+		 * SEQ number, except when seq == 0 (reset sent answering
+		 * SYN.
+		 */
+		seq = end = sender->td_end;
+		
+	DEBUGP("tcp_in_window: src=%u.%u.%u.%u:%hu dst=%u.%u.%u.%u:%hu "
+	       "seq=%u ack=%u sack =%u win=%u end=%u\n",
+		NIPQUAD(iph->saddr), ntohs(tcph->source),
+		NIPQUAD(iph->daddr), ntohs(tcph->dest),
+		seq, ack, sack, win, end);
+	DEBUGP("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
+	       "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
+		sender->td_end, sender->td_maxend, sender->td_maxwin,
+		sender->td_scale, 
+		receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
+		receiver->td_scale);
+	
+	DEBUGP("tcp_in_window: I=%i II=%i III=%i IV=%i\n",
+		before(seq, sender->td_maxend + 1),
+	    	after(end, sender->td_end - receiver->td_maxwin - 1),
+	    	before(sack, receiver->td_end + 1),
+	    	after(ack, receiver->td_end - MAXACKWINDOW(sender)));
+	
+	if (sender->loose || receiver->loose ||
+	    (before(seq, sender->td_maxend + 1) &&
+	     after(end, sender->td_end - receiver->td_maxwin - 1) &&
+	     before(sack, receiver->td_end + 1) &&
+	     after(ack, receiver->td_end - MAXACKWINDOW(sender)))) {
+	    	/*
+		 * Take into account window scaling (RFC 1323).
+		 */
+		if (!tcph->syn)
+			win <<= sender->td_scale;
+		
+		/*
+		 * Update sender data.
+		 */
+		swin = win + (sack - ack);
+		if (sender->td_maxwin < swin)
+			sender->td_maxwin = swin;
+		if (after(end, sender->td_end))
+			sender->td_end = end;
+		/*
+		 * Update receiver data.
+		 */
+		if (after(end, sender->td_maxend))
+			receiver->td_maxwin += end - sender->td_maxend;
+		if (after(sack + win, receiver->td_maxend - 1)) {
+			receiver->td_maxend = sack + win;
+			if (win == 0)
+				receiver->td_maxend++;
+		}
+
+		/* 
+		 * Check retransmissions.
+		 */
+		if (index == TCP_ACK_SET) {
+			if (state->last_dir == dir
+			    && state->last_seq == seq
+			    && state->last_ack == ack
+			    && state->last_end == end)
+				state->retrans++;
+			else {
+				state->last_dir = dir;
+				state->last_seq = seq;
+				state->last_ack = ack;
+				state->last_end = end;
+				state->retrans = 0;
+			}
+		}
+		/*
+		 * Close the window of disabled window tracking :-)
+		 */
+		if (sender->loose)
+			sender->loose--;
+		
+		res = 1;
+	} else {
+		if (LOG_INVALID(IPPROTO_TCP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL,
+			"ip_ct_tcp: %s ",
+			before(seq, sender->td_maxend + 1) ?
+			after(end, sender->td_end - receiver->td_maxwin - 1) ?
+			before(sack, receiver->td_end + 1) ?
+			after(ack, receiver->td_end - MAXACKWINDOW(sender)) ? "BUG"
+			: "ACK is under the lower bound (possible overly delayed ACK)"
+			: "ACK is over the upper bound (ACKed data not seen yet)"
+			: "SEQ is under the lower bound (already ACKed data retransmitted)"
+			: "SEQ is over the upper bound (over the window of the receiver)");
+
+		res = ip_ct_tcp_be_liberal;
+  	}
+  
+	DEBUGP("tcp_in_window: res=%i sender end=%u maxend=%u maxwin=%u "
+	       "receiver end=%u maxend=%u maxwin=%u\n",
+		res, sender->td_end, sender->td_maxend, sender->td_maxwin, 
+		receiver->td_end, receiver->td_maxend, receiver->td_maxwin);
+
+	return res;
+}
+
+#ifdef CONFIG_IP_NF_NAT_NEEDED
+/* Update sender->td_end after NAT successfully mangled the packet */
+void ip_conntrack_tcp_update(struct sk_buff *skb,
+			     struct ip_conntrack *conntrack, 
+			     enum ip_conntrack_dir dir)
+{
+	struct iphdr *iph = skb->nh.iph;
+	struct tcphdr *tcph = (void *)skb->nh.iph + skb->nh.iph->ihl*4;
+	__u32 end;
+#ifdef DEBUGP_VARS
+	struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[dir];
+	struct ip_ct_tcp_state *receiver = &conntrack->proto.tcp.seen[!dir];
+#endif
+
+	end = segment_seq_plus_len(ntohl(tcph->seq), skb->len, iph, tcph);
+	
+	WRITE_LOCK(&tcp_lock);
+	/*
+	 * We have to worry for the ack in the reply packet only...
+	 */
+	if (after(end, conntrack->proto.tcp.seen[dir].td_end))
+		conntrack->proto.tcp.seen[dir].td_end = end;
+	conntrack->proto.tcp.last_end = end;
+	WRITE_UNLOCK(&tcp_lock);
+	DEBUGP("tcp_update: sender end=%u maxend=%u maxwin=%u scale=%i "
+	       "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
+		sender->td_end, sender->td_maxend, sender->td_maxwin,
+		sender->td_scale, 
+		receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
+		receiver->td_scale);
+}
+ 
+#endif
+
+#define	TH_FIN	0x01
+#define	TH_SYN	0x02
+#define	TH_RST	0x04
+#define	TH_PUSH	0x08
+#define	TH_ACK	0x10
+#define	TH_URG	0x20
+#define	TH_ECE	0x40
+#define	TH_CWR	0x80
+
+/* table of valid flag combinations - ECE and CWR are always valid */
+static u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG) + 1] =
+{
+	[TH_SYN]			= 1,
+	[TH_SYN|TH_ACK]			= 1,
+	[TH_RST]			= 1,
+	[TH_RST|TH_ACK]			= 1,
+	[TH_RST|TH_ACK|TH_PUSH]		= 1,
+	[TH_FIN|TH_ACK]			= 1,
+	[TH_ACK]			= 1,
+	[TH_ACK|TH_PUSH]		= 1,
+	[TH_ACK|TH_URG]			= 1,
+	[TH_ACK|TH_URG|TH_PUSH]		= 1,
+	[TH_FIN|TH_ACK|TH_PUSH]		= 1,
+	[TH_FIN|TH_ACK|TH_URG]		= 1,
+	[TH_FIN|TH_ACK|TH_URG|TH_PUSH]	= 1,
+};
+
+/* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c.  */
+static int tcp_error(struct sk_buff *skb,
+		     enum ip_conntrack_info *ctinfo,
+		     unsigned int hooknum)
+{
+	struct iphdr *iph = skb->nh.iph;
+	struct tcphdr _tcph, *th;
+	unsigned int tcplen = skb->len - iph->ihl * 4;
+	u_int8_t tcpflags;
+
+	/* Smaller that minimal TCP header? */
+	th = skb_header_pointer(skb, iph->ihl * 4,
+				sizeof(_tcph), &_tcph);
+	if (th == NULL) {
+		if (LOG_INVALID(IPPROTO_TCP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				"ip_ct_tcp: short packet ");
+		return -NF_ACCEPT;
+  	}
+  
+	/* Not whole TCP header or malformed packet */
+	if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) {
+		if (LOG_INVALID(IPPROTO_TCP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				"ip_ct_tcp: truncated/malformed packet ");
+		return -NF_ACCEPT;
+	}
+  
+	/* Checksum invalid? Ignore.
+	 * We skip checking packets on the outgoing path
+	 * because the semantic of CHECKSUM_HW is different there 
+	 * and moreover root might send raw packets.
+	 */
+	/* FIXME: Source route IP option packets --RR */
+	if (hooknum == NF_IP_PRE_ROUTING
+	    && csum_tcpudp_magic(iph->saddr, iph->daddr, tcplen, IPPROTO_TCP,
+			         skb->ip_summed == CHECKSUM_HW ? skb->csum
+			      	 : skb_checksum(skb, iph->ihl*4, tcplen, 0))) {
+		if (LOG_INVALID(IPPROTO_TCP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				  "ip_ct_tcp: bad TCP checksum ");
+		return -NF_ACCEPT;
+	}
+
+	/* Check TCP flags. */
+	tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR));
+	if (!tcp_valid_flags[tcpflags]) {
+		if (LOG_INVALID(IPPROTO_TCP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				  "ip_ct_tcp: invalid TCP flag combination ");
+		return -NF_ACCEPT;
+	}
+
+	return NF_ACCEPT;
+}
+
+/* Returns verdict for packet, or -1 for invalid. */
+static int tcp_packet(struct ip_conntrack *conntrack,
+		      const struct sk_buff *skb,
+		      enum ip_conntrack_info ctinfo)
+{
+	enum tcp_conntrack new_state, old_state;
+	enum ip_conntrack_dir dir;
+	struct iphdr *iph = skb->nh.iph;
+	struct tcphdr *th, _tcph;
+	unsigned long timeout;
+	unsigned int index;
+	
+	th = skb_header_pointer(skb, iph->ihl * 4,
+				sizeof(_tcph), &_tcph);
+	BUG_ON(th == NULL);
+	
+	WRITE_LOCK(&tcp_lock);
+	old_state = conntrack->proto.tcp.state;
+	dir = CTINFO2DIR(ctinfo);
+	index = get_conntrack_index(th);
+	new_state = tcp_conntracks[dir][index][old_state];
+
+	switch (new_state) {
+	case TCP_CONNTRACK_IGNORE:
+		/* Either SYN in ORIGINAL
+		 * or SYN/ACK in REPLY. */
+		if (index == TCP_SYNACK_SET
+		    && conntrack->proto.tcp.last_index == TCP_SYN_SET
+		    && conntrack->proto.tcp.last_dir != dir
+		    && ntohl(th->ack_seq) ==
+		    	     conntrack->proto.tcp.last_end) {
+			/* This SYN/ACK acknowledges a SYN that we earlier 
+			 * ignored as invalid. This means that the client and
+			 * the server are both in sync, while the firewall is
+			 * not. We kill this session and block the SYN/ACK so
+			 * that the client cannot but retransmit its SYN and 
+			 * thus initiate a clean new session.
+			 */
+		    	WRITE_UNLOCK(&tcp_lock);
+			if (LOG_INVALID(IPPROTO_TCP))
+				nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+					  "ip_ct_tcp: killing out of sync session ");
+		    	if (del_timer(&conntrack->timeout))
+		    		conntrack->timeout.function((unsigned long)
+		    					    conntrack);
+		    	return -NF_DROP;
+		}
+		conntrack->proto.tcp.last_index = index;
+		conntrack->proto.tcp.last_dir = dir;
+		conntrack->proto.tcp.last_seq = ntohl(th->seq);
+		conntrack->proto.tcp.last_end = 
+		    segment_seq_plus_len(ntohl(th->seq), skb->len, iph, th);
+		
+		WRITE_UNLOCK(&tcp_lock);
+		if (LOG_INVALID(IPPROTO_TCP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				  "ip_ct_tcp: invalid packet ignored ");
+		return NF_ACCEPT;
+	case TCP_CONNTRACK_MAX:
+		/* Invalid packet */
+		DEBUGP("ip_ct_tcp: Invalid dir=%i index=%u ostate=%u\n",
+		       dir, get_conntrack_index(th),
+		       old_state);
+		WRITE_UNLOCK(&tcp_lock);
+		if (LOG_INVALID(IPPROTO_TCP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				  "ip_ct_tcp: invalid state ");
+		return -NF_ACCEPT;
+	case TCP_CONNTRACK_SYN_SENT:
+		if (old_state < TCP_CONNTRACK_TIME_WAIT)
+			break;
+		if ((conntrack->proto.tcp.seen[dir].flags &
+		         IP_CT_TCP_FLAG_CLOSE_INIT)
+		    || after(ntohl(th->seq),
+		    	     conntrack->proto.tcp.seen[dir].td_end)) {	
+		    	/* Attempt to reopen a closed connection.
+		    	* Delete this connection and look up again. */
+		    	WRITE_UNLOCK(&tcp_lock);
+		    	if (del_timer(&conntrack->timeout))
+		    		conntrack->timeout.function((unsigned long)
+		    					    conntrack);
+		    	return -NF_REPEAT;
+		} else {
+			WRITE_UNLOCK(&tcp_lock);
+			if (LOG_INVALID(IPPROTO_TCP))
+				nf_log_packet(PF_INET, 0, skb, NULL, NULL,
+				              "ip_ct_tcp: invalid SYN");
+			return -NF_ACCEPT;
+		}
+	case TCP_CONNTRACK_CLOSE:
+		if (index == TCP_RST_SET
+		    && test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
+		    && conntrack->proto.tcp.last_index == TCP_SYN_SET
+		    && ntohl(th->ack_seq) == conntrack->proto.tcp.last_end) {
+			/* RST sent to invalid SYN we had let trough
+			 * SYN was in window then, tear down connection.
+			 * We skip window checking, because packet might ACK
+			 * segments we ignored in the SYN. */
+			goto in_window;
+		}
+		/* Just fall trough */
+	default:
+		/* Keep compilers happy. */
+		break;
+	}
+
+	if (!tcp_in_window(&conntrack->proto.tcp, dir, index, 
+			   skb, iph, th)) {
+		WRITE_UNLOCK(&tcp_lock);
+		return -NF_ACCEPT;
+	}
+    in_window:
+	/* From now on we have got in-window packets */	
+	conntrack->proto.tcp.last_index = index;
+
+	DEBUGP("tcp_conntracks: src=%u.%u.%u.%u:%hu dst=%u.%u.%u.%u:%hu "
+	       "syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n",
+		NIPQUAD(iph->saddr), ntohs(th->source),
+		NIPQUAD(iph->daddr), ntohs(th->dest),
+		(th->syn ? 1 : 0), (th->ack ? 1 : 0),
+		(th->fin ? 1 : 0), (th->rst ? 1 : 0),
+		old_state, new_state);
+
+	conntrack->proto.tcp.state = new_state;
+	if (old_state != new_state 
+	    && (new_state == TCP_CONNTRACK_FIN_WAIT
+	    	|| new_state == TCP_CONNTRACK_CLOSE))
+		conntrack->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT;
+	timeout = conntrack->proto.tcp.retrans >= ip_ct_tcp_max_retrans
+		  && *tcp_timeouts[new_state] > ip_ct_tcp_timeout_max_retrans
+		  ? ip_ct_tcp_timeout_max_retrans : *tcp_timeouts[new_state];
+	WRITE_UNLOCK(&tcp_lock);
+
+	if (!test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)) {
+		/* If only reply is a RST, we can consider ourselves not to
+		   have an established connection: this is a fairly common
+		   problem case, so we can delete the conntrack
+		   immediately.  --RR */
+		if (th->rst) {
+			if (del_timer(&conntrack->timeout))
+				conntrack->timeout.function((unsigned long)
+							    conntrack);
+			return NF_ACCEPT;
+		}
+	} else if (!test_bit(IPS_ASSURED_BIT, &conntrack->status)
+		   && (old_state == TCP_CONNTRACK_SYN_RECV
+		       || old_state == TCP_CONNTRACK_ESTABLISHED)
+		   && new_state == TCP_CONNTRACK_ESTABLISHED) {
+		/* Set ASSURED if we see see valid ack in ESTABLISHED 
+		   after SYN_RECV or a valid answer for a picked up 
+		   connection. */
+			set_bit(IPS_ASSURED_BIT, &conntrack->status);
+	}
+	ip_ct_refresh_acct(conntrack, ctinfo, skb, timeout);
+
+	return NF_ACCEPT;
+}
+ 
+/* Called when a new connection for this protocol found. */
+static int tcp_new(struct ip_conntrack *conntrack,
+		   const struct sk_buff *skb)
+{
+	enum tcp_conntrack new_state;
+	struct iphdr *iph = skb->nh.iph;
+	struct tcphdr *th, _tcph;
+#ifdef DEBUGP_VARS
+	struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[0];
+	struct ip_ct_tcp_state *receiver = &conntrack->proto.tcp.seen[1];
+#endif
+
+	th = skb_header_pointer(skb, iph->ihl * 4,
+				sizeof(_tcph), &_tcph);
+	BUG_ON(th == NULL);
+	
+	/* Don't need lock here: this conntrack not in circulation yet */
+	new_state
+		= tcp_conntracks[0][get_conntrack_index(th)]
+		[TCP_CONNTRACK_NONE];
+
+	/* Invalid: delete conntrack */
+	if (new_state >= TCP_CONNTRACK_MAX) {
+		DEBUGP("ip_ct_tcp: invalid new deleting.\n");
+		return 0;
+	}
+
+	if (new_state == TCP_CONNTRACK_SYN_SENT) {
+		/* SYN packet */
+		conntrack->proto.tcp.seen[0].td_end =
+			segment_seq_plus_len(ntohl(th->seq), skb->len,
+					     iph, th);
+		conntrack->proto.tcp.seen[0].td_maxwin = ntohs(th->window);
+		if (conntrack->proto.tcp.seen[0].td_maxwin == 0)
+			conntrack->proto.tcp.seen[0].td_maxwin = 1;
+		conntrack->proto.tcp.seen[0].td_maxend =
+			conntrack->proto.tcp.seen[0].td_end;
+
+		tcp_options(skb, iph, th, &conntrack->proto.tcp.seen[0]);
+		conntrack->proto.tcp.seen[1].flags = 0;
+		conntrack->proto.tcp.seen[0].loose = 
+		conntrack->proto.tcp.seen[1].loose = 0;
+	} else if (ip_ct_tcp_loose == 0) {
+		/* Don't try to pick up connections. */
+		return 0;
+	} else {
+		/*
+		 * We are in the middle of a connection,
+		 * its history is lost for us.
+		 * Let's try to use the data from the packet.
+		 */
+		conntrack->proto.tcp.seen[0].td_end =
+			segment_seq_plus_len(ntohl(th->seq), skb->len,
+					     iph, th);
+		conntrack->proto.tcp.seen[0].td_maxwin = ntohs(th->window);
+		if (conntrack->proto.tcp.seen[0].td_maxwin == 0)
+			conntrack->proto.tcp.seen[0].td_maxwin = 1;
+		conntrack->proto.tcp.seen[0].td_maxend =
+			conntrack->proto.tcp.seen[0].td_end + 
+			conntrack->proto.tcp.seen[0].td_maxwin;
+		conntrack->proto.tcp.seen[0].td_scale = 0;
+
+		/* We assume SACK. Should we assume window scaling too? */
+		conntrack->proto.tcp.seen[0].flags =
+		conntrack->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM;
+		conntrack->proto.tcp.seen[0].loose = 
+		conntrack->proto.tcp.seen[1].loose = ip_ct_tcp_loose;
+	}
+    
+	conntrack->proto.tcp.seen[1].td_end = 0;
+	conntrack->proto.tcp.seen[1].td_maxend = 0;
+	conntrack->proto.tcp.seen[1].td_maxwin = 1;
+	conntrack->proto.tcp.seen[1].td_scale = 0;      
+
+	/* tcp_packet will set them */
+	conntrack->proto.tcp.state = TCP_CONNTRACK_NONE;
+	conntrack->proto.tcp.last_index = TCP_NONE_SET;
+	 
+	DEBUGP("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i "
+	       "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
+		sender->td_end, sender->td_maxend, sender->td_maxwin,
+		sender->td_scale, 
+		receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
+		receiver->td_scale);
+	return 1;
+}
+  
+struct ip_conntrack_protocol ip_conntrack_protocol_tcp =
+{
+	.proto 			= IPPROTO_TCP,
+	.name 			= "tcp",
+	.pkt_to_tuple 		= tcp_pkt_to_tuple,
+	.invert_tuple 		= tcp_invert_tuple,
+	.print_tuple 		= tcp_print_tuple,
+	.print_conntrack 	= tcp_print_conntrack,
+	.packet 		= tcp_packet,
+	.new 			= tcp_new,
+	.error			= tcp_error,
+};
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_udp.c b/net/ipv4/netfilter/ip_conntrack_proto_udp.c
new file mode 100644
index 000000000000..5bc28a224623
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_proto_udp.c
@@ -0,0 +1,146 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/netfilter.h>
+#include <linux/in.h>
+#include <linux/udp.h>
+#include <linux/seq_file.h>
+#include <net/checksum.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+
+unsigned long ip_ct_udp_timeout = 30*HZ;
+unsigned long ip_ct_udp_timeout_stream = 180*HZ;
+
+static int udp_pkt_to_tuple(const struct sk_buff *skb,
+			     unsigned int dataoff,
+			     struct ip_conntrack_tuple *tuple)
+{
+	struct udphdr _hdr, *hp;
+
+	/* Actually only need first 8 bytes. */
+	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
+	if (hp == NULL)
+		return 0;
+
+	tuple->src.u.udp.port = hp->source;
+	tuple->dst.u.udp.port = hp->dest;
+
+	return 1;
+}
+
+static int udp_invert_tuple(struct ip_conntrack_tuple *tuple,
+			    const struct ip_conntrack_tuple *orig)
+{
+	tuple->src.u.udp.port = orig->dst.u.udp.port;
+	tuple->dst.u.udp.port = orig->src.u.udp.port;
+	return 1;
+}
+
+/* Print out the per-protocol part of the tuple. */
+static int udp_print_tuple(struct seq_file *s,
+			   const struct ip_conntrack_tuple *tuple)
+{
+	return seq_printf(s, "sport=%hu dport=%hu ",
+			  ntohs(tuple->src.u.udp.port),
+			  ntohs(tuple->dst.u.udp.port));
+}
+
+/* Print out the private part of the conntrack. */
+static int udp_print_conntrack(struct seq_file *s,
+			       const struct ip_conntrack *conntrack)
+{
+	return 0;
+}
+
+/* Returns verdict for packet, and may modify conntracktype */
+static int udp_packet(struct ip_conntrack *conntrack,
+		      const struct sk_buff *skb,
+		      enum ip_conntrack_info ctinfo)
+{
+	/* If we've seen traffic both ways, this is some kind of UDP
+	   stream.  Extend timeout. */
+	if (test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)) {
+		ip_ct_refresh_acct(conntrack, ctinfo, skb, 
+				   ip_ct_udp_timeout_stream);
+		/* Also, more likely to be important, and not a probe */
+		set_bit(IPS_ASSURED_BIT, &conntrack->status);
+	} else
+		ip_ct_refresh_acct(conntrack, ctinfo, skb, ip_ct_udp_timeout);
+
+	return NF_ACCEPT;
+}
+
+/* Called when a new connection for this protocol found. */
+static int udp_new(struct ip_conntrack *conntrack, const struct sk_buff *skb)
+{
+	return 1;
+}
+
+static int udp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
+		     unsigned int hooknum)
+{
+	struct iphdr *iph = skb->nh.iph;
+	unsigned int udplen = skb->len - iph->ihl * 4;
+	struct udphdr _hdr, *hdr;
+
+	/* Header is too small? */
+	hdr = skb_header_pointer(skb, iph->ihl*4, sizeof(_hdr), &_hdr);
+	if (hdr == NULL) {
+		if (LOG_INVALID(IPPROTO_UDP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				  "ip_ct_udp: short packet ");
+		return -NF_ACCEPT;
+	}
+	
+	/* Truncated/malformed packets */
+	if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) {
+		if (LOG_INVALID(IPPROTO_UDP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				  "ip_ct_udp: truncated/malformed packet ");
+		return -NF_ACCEPT;
+	}
+	
+	/* Packet with no checksum */
+	if (!hdr->check)
+		return NF_ACCEPT;
+
+	/* Checksum invalid? Ignore.
+	 * We skip checking packets on the outgoing path
+	 * because the semantic of CHECKSUM_HW is different there 
+	 * and moreover root might send raw packets.
+	 * FIXME: Source route IP option packets --RR */
+	if (hooknum == NF_IP_PRE_ROUTING
+	    && csum_tcpudp_magic(iph->saddr, iph->daddr, udplen, IPPROTO_UDP,
+			         skb->ip_summed == CHECKSUM_HW ? skb->csum
+			      	 : skb_checksum(skb, iph->ihl*4, udplen, 0))) {
+		if (LOG_INVALID(IPPROTO_UDP))
+			nf_log_packet(PF_INET, 0, skb, NULL, NULL, 
+				  "ip_ct_udp: bad UDP checksum ");
+		return -NF_ACCEPT;
+	}
+	
+	return NF_ACCEPT;
+}
+
+struct ip_conntrack_protocol ip_conntrack_protocol_udp =
+{
+	.proto 			= IPPROTO_UDP,
+	.name			= "udp",
+	.pkt_to_tuple		= udp_pkt_to_tuple,
+	.invert_tuple		= udp_invert_tuple,
+	.print_tuple		= udp_print_tuple,
+	.print_conntrack	= udp_print_conntrack,
+	.packet			= udp_packet,
+	.new			= udp_new,
+	.error			= udp_error,
+};
diff --git a/net/ipv4/netfilter/ip_conntrack_standalone.c b/net/ipv4/netfilter/ip_conntrack_standalone.c
new file mode 100644
index 000000000000..80a7bde2a57a
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_standalone.c
@@ -0,0 +1,961 @@
+/* This file contains all the functions required for the standalone
+   ip_conntrack module.
+
+   These are not required by the compatibility layer.
+*/
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/percpu.h>
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+#include <net/checksum.h>
+#include <net/ip.h>
+
+#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_conntrack_lock)
+#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_conntrack_lock)
+
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+MODULE_LICENSE("GPL");
+
+extern atomic_t ip_conntrack_count;
+DECLARE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
+
+static int kill_proto(struct ip_conntrack *i, void *data)
+{
+	return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum == 
+			*((u_int8_t *) data));
+}
+
+#ifdef CONFIG_PROC_FS
+static int
+print_tuple(struct seq_file *s, const struct ip_conntrack_tuple *tuple,
+	    struct ip_conntrack_protocol *proto)
+{
+	seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
+		   NIPQUAD(tuple->src.ip), NIPQUAD(tuple->dst.ip));
+	return proto->print_tuple(s, tuple);
+}
+
+#ifdef CONFIG_IP_NF_CT_ACCT
+static unsigned int
+seq_print_counters(struct seq_file *s,
+		   const struct ip_conntrack_counter *counter)
+{
+	return seq_printf(s, "packets=%llu bytes=%llu ",
+			  (unsigned long long)counter->packets,
+			  (unsigned long long)counter->bytes);
+}
+#else
+#define seq_print_counters(x, y)	0
+#endif
+
+struct ct_iter_state {
+	unsigned int bucket;
+};
+
+static struct list_head *ct_get_first(struct seq_file *seq)
+{
+	struct ct_iter_state *st = seq->private;
+
+	for (st->bucket = 0;
+	     st->bucket < ip_conntrack_htable_size;
+	     st->bucket++) {
+		if (!list_empty(&ip_conntrack_hash[st->bucket]))
+			return ip_conntrack_hash[st->bucket].next;
+	}
+	return NULL;
+}
+
+static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
+{
+	struct ct_iter_state *st = seq->private;
+
+	head = head->next;
+	while (head == &ip_conntrack_hash[st->bucket]) {
+		if (++st->bucket >= ip_conntrack_htable_size)
+			return NULL;
+		head = ip_conntrack_hash[st->bucket].next;
+	}
+	return head;
+}
+
+static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
+{
+	struct list_head *head = ct_get_first(seq);
+
+	if (head)
+		while (pos && (head = ct_get_next(seq, head)))
+			pos--;
+	return pos ? NULL : head;
+}
+
+static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	READ_LOCK(&ip_conntrack_lock);
+	return ct_get_idx(seq, *pos);
+}
+
+static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	(*pos)++;
+	return ct_get_next(s, v);
+}
+  
+static void ct_seq_stop(struct seq_file *s, void *v)
+{
+	READ_UNLOCK(&ip_conntrack_lock);
+}
+ 
+static int ct_seq_show(struct seq_file *s, void *v)
+{
+	const struct ip_conntrack_tuple_hash *hash = v;
+	const struct ip_conntrack *conntrack = tuplehash_to_ctrack(hash);
+	struct ip_conntrack_protocol *proto;
+
+	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+	IP_NF_ASSERT(conntrack);
+
+	/* we only want to print DIR_ORIGINAL */
+	if (DIRECTION(hash))
+		return 0;
+
+	proto = ip_ct_find_proto(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
+			       .tuple.dst.protonum);
+	IP_NF_ASSERT(proto);
+
+	if (seq_printf(s, "%-8s %u %ld ",
+		      proto->name,
+		      conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
+		      timer_pending(&conntrack->timeout)
+		      ? (long)(conntrack->timeout.expires - jiffies)/HZ
+		      : 0) != 0)
+		return -ENOSPC;
+
+	if (proto->print_conntrack(s, conntrack))
+		return -ENOSPC;
+  
+	if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
+			proto))
+		return -ENOSPC;
+
+ 	if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
+		return -ENOSPC;
+
+	if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
+		if (seq_printf(s, "[UNREPLIED] "))
+			return -ENOSPC;
+
+	if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
+			proto))
+		return -ENOSPC;
+
+ 	if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
+		return -ENOSPC;
+
+	if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
+		if (seq_printf(s, "[ASSURED] "))
+			return -ENOSPC;
+
+#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
+	if (seq_printf(s, "mark=%lu ", conntrack->mark))
+		return -ENOSPC;
+#endif
+
+	if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
+		return -ENOSPC;
+
+	return 0;
+}
+
+static struct seq_operations ct_seq_ops = {
+	.start = ct_seq_start,
+	.next  = ct_seq_next,
+	.stop  = ct_seq_stop,
+	.show  = ct_seq_show
+};
+  
+static int ct_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	struct ct_iter_state *st;
+	int ret;
+
+	st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
+	if (st == NULL)
+		return -ENOMEM;
+	ret = seq_open(file, &ct_seq_ops);
+	if (ret)
+		goto out_free;
+	seq          = file->private_data;
+	seq->private = st;
+	memset(st, 0, sizeof(struct ct_iter_state));
+	return ret;
+out_free:
+	kfree(st);
+	return ret;
+}
+
+static struct file_operations ct_file_ops = {
+	.owner   = THIS_MODULE,
+	.open    = ct_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release_private,
+};
+  
+/* expects */
+static void *exp_seq_start(struct seq_file *s, loff_t *pos)
+{
+	struct list_head *e = &ip_conntrack_expect_list;
+	loff_t i;
+
+	/* strange seq_file api calls stop even if we fail,
+	 * thus we need to grab lock since stop unlocks */
+	READ_LOCK(&ip_conntrack_lock);
+
+	if (list_empty(e))
+		return NULL;
+
+	for (i = 0; i <= *pos; i++) {
+		e = e->next;
+		if (e == &ip_conntrack_expect_list)
+			return NULL;
+	}
+	return e;
+}
+
+static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ 	struct list_head *e = v;
+
+	e = e->next;
+
+	if (e == &ip_conntrack_expect_list)
+		return NULL;
+
+	return e;
+}
+
+static void exp_seq_stop(struct seq_file *s, void *v)
+{
+	READ_UNLOCK(&ip_conntrack_lock);
+}
+
+static int exp_seq_show(struct seq_file *s, void *v)
+{
+	struct ip_conntrack_expect *expect = v;
+
+	if (expect->timeout.function)
+		seq_printf(s, "%ld ", timer_pending(&expect->timeout)
+			   ? (long)(expect->timeout.expires - jiffies)/HZ : 0);
+	else
+		seq_printf(s, "- ");
+
+	seq_printf(s, "proto=%u ", expect->tuple.dst.protonum);
+
+	print_tuple(s, &expect->tuple,
+		    ip_ct_find_proto(expect->tuple.dst.protonum));
+	return seq_putc(s, '\n');
+}
+
+static struct seq_operations exp_seq_ops = {
+	.start = exp_seq_start,
+	.next = exp_seq_next,
+	.stop = exp_seq_stop,
+	.show = exp_seq_show
+};
+
+static int exp_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &exp_seq_ops);
+}
+  
+static struct file_operations exp_file_ops = {
+	.owner   = THIS_MODULE,
+	.open    = exp_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release
+};
+
+static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	int cpu;
+
+	if (*pos == 0)
+		return SEQ_START_TOKEN;
+
+	for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
+		if (!cpu_possible(cpu))
+			continue;
+		*pos = cpu+1;
+		return &per_cpu(ip_conntrack_stat, cpu);
+	}
+
+	return NULL;
+}
+
+static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	int cpu;
+
+	for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
+		if (!cpu_possible(cpu))
+			continue;
+		*pos = cpu+1;
+		return &per_cpu(ip_conntrack_stat, cpu);
+	}
+
+	return NULL;
+}
+
+static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
+{
+}
+
+static int ct_cpu_seq_show(struct seq_file *seq, void *v)
+{
+	unsigned int nr_conntracks = atomic_read(&ip_conntrack_count);
+	struct ip_conntrack_stat *st = v;
+
+	if (v == SEQ_START_TOKEN) {
+		seq_printf(seq, "entries  searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete\n");
+		return 0;
+	}
+
+	seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
+			"%08x %08x %08x %08x %08x  %08x %08x %08x \n",
+		   nr_conntracks,
+		   st->searched,
+		   st->found,
+		   st->new,
+		   st->invalid,
+		   st->ignore,
+		   st->delete,
+		   st->delete_list,
+		   st->insert,
+		   st->insert_failed,
+		   st->drop,
+		   st->early_drop,
+		   st->error,
+
+		   st->expect_new,
+		   st->expect_create,
+		   st->expect_delete
+		);
+	return 0;
+}
+
+static struct seq_operations ct_cpu_seq_ops = {
+	.start  = ct_cpu_seq_start,
+	.next   = ct_cpu_seq_next,
+	.stop   = ct_cpu_seq_stop,
+	.show   = ct_cpu_seq_show,
+};
+
+static int ct_cpu_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &ct_cpu_seq_ops);
+}
+
+static struct file_operations ct_cpu_seq_fops = {
+	.owner   = THIS_MODULE,
+	.open    = ct_cpu_seq_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release_private,
+};
+#endif
+
+static unsigned int ip_confirm(unsigned int hooknum,
+			       struct sk_buff **pskb,
+			       const struct net_device *in,
+			       const struct net_device *out,
+			       int (*okfn)(struct sk_buff *))
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+
+	/* This is where we call the helper: as the packet goes out. */
+	ct = ip_conntrack_get(*pskb, &ctinfo);
+	if (ct && ct->helper) {
+		unsigned int ret;
+		ret = ct->helper->help(pskb, ct, ctinfo);
+		if (ret != NF_ACCEPT)
+			return ret;
+	}
+
+	/* We've seen it coming out the other side: confirm it */
+	return ip_conntrack_confirm(pskb);
+}
+
+static unsigned int ip_conntrack_defrag(unsigned int hooknum,
+				        struct sk_buff **pskb,
+				        const struct net_device *in,
+				        const struct net_device *out,
+				        int (*okfn)(struct sk_buff *))
+{
+#if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
+	/* Previously seen (loopback)?  Ignore.  Do this before
+           fragment check. */
+	if ((*pskb)->nfct)
+		return NF_ACCEPT;
+#endif
+
+	/* Gather fragments. */
+	if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
+		*pskb = ip_ct_gather_frags(*pskb,
+		                           hooknum == NF_IP_PRE_ROUTING ? 
+					   IP_DEFRAG_CONNTRACK_IN :
+					   IP_DEFRAG_CONNTRACK_OUT);
+		if (!*pskb)
+			return NF_STOLEN;
+	}
+	return NF_ACCEPT;
+}
+
+static unsigned int ip_refrag(unsigned int hooknum,
+			      struct sk_buff **pskb,
+			      const struct net_device *in,
+			      const struct net_device *out,
+			      int (*okfn)(struct sk_buff *))
+{
+	struct rtable *rt = (struct rtable *)(*pskb)->dst;
+
+	/* We've seen it coming out the other side: confirm */
+	if (ip_confirm(hooknum, pskb, in, out, okfn) != NF_ACCEPT)
+		return NF_DROP;
+
+	/* Local packets are never produced too large for their
+	   interface.  We degfragment them at LOCAL_OUT, however,
+	   so we have to refragment them here. */
+	if ((*pskb)->len > dst_mtu(&rt->u.dst) &&
+	    !skb_shinfo(*pskb)->tso_size) {
+		/* No hook can be after us, so this should be OK. */
+		ip_fragment(*pskb, okfn);
+		return NF_STOLEN;
+	}
+	return NF_ACCEPT;
+}
+
+static unsigned int ip_conntrack_local(unsigned int hooknum,
+				       struct sk_buff **pskb,
+				       const struct net_device *in,
+				       const struct net_device *out,
+				       int (*okfn)(struct sk_buff *))
+{
+	/* root is playing with raw sockets. */
+	if ((*pskb)->len < sizeof(struct iphdr)
+	    || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+		if (net_ratelimit())
+			printk("ipt_hook: happy cracking.\n");
+		return NF_ACCEPT;
+	}
+	return ip_conntrack_in(hooknum, pskb, in, out, okfn);
+}
+
+/* Connection tracking may drop packets, but never alters them, so
+   make it the first hook. */
+static struct nf_hook_ops ip_conntrack_defrag_ops = {
+	.hook		= ip_conntrack_defrag,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_PRE_ROUTING,
+	.priority	= NF_IP_PRI_CONNTRACK_DEFRAG,
+};
+
+static struct nf_hook_ops ip_conntrack_in_ops = {
+	.hook		= ip_conntrack_in,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_PRE_ROUTING,
+	.priority	= NF_IP_PRI_CONNTRACK,
+};
+
+static struct nf_hook_ops ip_conntrack_defrag_local_out_ops = {
+	.hook		= ip_conntrack_defrag,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_LOCAL_OUT,
+	.priority	= NF_IP_PRI_CONNTRACK_DEFRAG,
+};
+
+static struct nf_hook_ops ip_conntrack_local_out_ops = {
+	.hook		= ip_conntrack_local,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_LOCAL_OUT,
+	.priority	= NF_IP_PRI_CONNTRACK,
+};
+
+/* Refragmenter; last chance. */
+static struct nf_hook_ops ip_conntrack_out_ops = {
+	.hook		= ip_refrag,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_POST_ROUTING,
+	.priority	= NF_IP_PRI_LAST,
+};
+
+static struct nf_hook_ops ip_conntrack_local_in_ops = {
+	.hook		= ip_confirm,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_LOCAL_IN,
+	.priority	= NF_IP_PRI_LAST-1,
+};
+
+/* Sysctl support */
+
+#ifdef CONFIG_SYSCTL
+
+/* From ip_conntrack_core.c */
+extern int ip_conntrack_max;
+extern unsigned int ip_conntrack_htable_size;
+
+/* From ip_conntrack_proto_tcp.c */
+extern unsigned long ip_ct_tcp_timeout_syn_sent;
+extern unsigned long ip_ct_tcp_timeout_syn_recv;
+extern unsigned long ip_ct_tcp_timeout_established;
+extern unsigned long ip_ct_tcp_timeout_fin_wait;
+extern unsigned long ip_ct_tcp_timeout_close_wait;
+extern unsigned long ip_ct_tcp_timeout_last_ack;
+extern unsigned long ip_ct_tcp_timeout_time_wait;
+extern unsigned long ip_ct_tcp_timeout_close;
+extern unsigned long ip_ct_tcp_timeout_max_retrans;
+extern int ip_ct_tcp_loose;
+extern int ip_ct_tcp_be_liberal;
+extern int ip_ct_tcp_max_retrans;
+
+/* From ip_conntrack_proto_udp.c */
+extern unsigned long ip_ct_udp_timeout;
+extern unsigned long ip_ct_udp_timeout_stream;
+
+/* From ip_conntrack_proto_icmp.c */
+extern unsigned long ip_ct_icmp_timeout;
+
+/* From ip_conntrack_proto_icmp.c */
+extern unsigned long ip_ct_generic_timeout;
+
+/* Log invalid packets of a given protocol */
+static int log_invalid_proto_min = 0;
+static int log_invalid_proto_max = 255;
+
+static struct ctl_table_header *ip_ct_sysctl_header;
+
+static ctl_table ip_ct_sysctl_table[] = {
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_MAX,
+		.procname	= "ip_conntrack_max",
+		.data		= &ip_conntrack_max,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_COUNT,
+		.procname	= "ip_conntrack_count",
+		.data		= &ip_conntrack_count,
+		.maxlen		= sizeof(int),
+		.mode		= 0444,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_BUCKETS,
+		.procname	= "ip_conntrack_buckets",
+		.data		= &ip_conntrack_htable_size,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0444,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
+		.procname	= "ip_conntrack_tcp_timeout_syn_sent",
+		.data		= &ip_ct_tcp_timeout_syn_sent,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
+		.procname	= "ip_conntrack_tcp_timeout_syn_recv",
+		.data		= &ip_ct_tcp_timeout_syn_recv,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
+		.procname	= "ip_conntrack_tcp_timeout_established",
+		.data		= &ip_ct_tcp_timeout_established,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
+		.procname	= "ip_conntrack_tcp_timeout_fin_wait",
+		.data		= &ip_ct_tcp_timeout_fin_wait,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
+		.procname	= "ip_conntrack_tcp_timeout_close_wait",
+		.data		= &ip_ct_tcp_timeout_close_wait,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
+		.procname	= "ip_conntrack_tcp_timeout_last_ack",
+		.data		= &ip_ct_tcp_timeout_last_ack,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
+		.procname	= "ip_conntrack_tcp_timeout_time_wait",
+		.data		= &ip_ct_tcp_timeout_time_wait,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
+		.procname	= "ip_conntrack_tcp_timeout_close",
+		.data		= &ip_ct_tcp_timeout_close,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
+		.procname	= "ip_conntrack_udp_timeout",
+		.data		= &ip_ct_udp_timeout,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
+		.procname	= "ip_conntrack_udp_timeout_stream",
+		.data		= &ip_ct_udp_timeout_stream,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
+		.procname	= "ip_conntrack_icmp_timeout",
+		.data		= &ip_ct_icmp_timeout,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
+		.procname	= "ip_conntrack_generic_timeout",
+		.data		= &ip_ct_generic_timeout,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_LOG_INVALID,
+		.procname	= "ip_conntrack_log_invalid",
+		.data		= &ip_ct_log_invalid,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &log_invalid_proto_min,
+		.extra2		= &log_invalid_proto_max,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
+		.procname	= "ip_conntrack_tcp_timeout_max_retrans",
+		.data		= &ip_ct_tcp_timeout_max_retrans,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
+		.procname	= "ip_conntrack_tcp_loose",
+		.data		= &ip_ct_tcp_loose,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
+		.procname	= "ip_conntrack_tcp_be_liberal",
+		.data		= &ip_ct_tcp_be_liberal,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
+		.procname	= "ip_conntrack_tcp_max_retrans",
+		.data		= &ip_ct_tcp_max_retrans,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{ .ctl_name = 0 }
+};
+
+#define NET_IP_CONNTRACK_MAX 2089
+
+static ctl_table ip_ct_netfilter_table[] = {
+	{
+		.ctl_name	= NET_IPV4_NETFILTER,
+		.procname	= "netfilter",
+		.mode		= 0555,
+		.child		= ip_ct_sysctl_table,
+	},
+	{
+		.ctl_name	= NET_IP_CONNTRACK_MAX,
+		.procname	= "ip_conntrack_max",
+		.data		= &ip_conntrack_max,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table ip_ct_ipv4_table[] = {
+	{
+		.ctl_name	= NET_IPV4,
+		.procname	= "ipv4",
+		.mode		= 0555,
+		.child		= ip_ct_netfilter_table,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table ip_ct_net_table[] = {
+	{
+		.ctl_name	= CTL_NET,
+		.procname	= "net",
+		.mode		= 0555, 
+		.child		= ip_ct_ipv4_table,
+	},
+	{ .ctl_name = 0 }
+};
+
+EXPORT_SYMBOL(ip_ct_log_invalid);
+#endif /* CONFIG_SYSCTL */
+
+static int init_or_cleanup(int init)
+{
+#ifdef CONFIG_PROC_FS
+	struct proc_dir_entry *proc, *proc_exp, *proc_stat;
+#endif
+	int ret = 0;
+
+	if (!init) goto cleanup;
+
+	ret = ip_conntrack_init();
+	if (ret < 0)
+		goto cleanup_nothing;
+
+#ifdef CONFIG_PROC_FS
+	ret = -ENOMEM;
+	proc = proc_net_fops_create("ip_conntrack", 0440, &ct_file_ops);
+	if (!proc) goto cleanup_init;
+
+	proc_exp = proc_net_fops_create("ip_conntrack_expect", 0440,
+					&exp_file_ops);
+	if (!proc_exp) goto cleanup_proc;
+
+	proc_stat = create_proc_entry("ip_conntrack", S_IRUGO, proc_net_stat);
+	if (!proc_stat)
+		goto cleanup_proc_exp;
+
+	proc_stat->proc_fops = &ct_cpu_seq_fops;
+	proc_stat->owner = THIS_MODULE;
+#endif
+
+	ret = nf_register_hook(&ip_conntrack_defrag_ops);
+	if (ret < 0) {
+		printk("ip_conntrack: can't register pre-routing defrag hook.\n");
+		goto cleanup_proc_stat;
+	}
+	ret = nf_register_hook(&ip_conntrack_defrag_local_out_ops);
+	if (ret < 0) {
+		printk("ip_conntrack: can't register local_out defrag hook.\n");
+		goto cleanup_defragops;
+	}
+	ret = nf_register_hook(&ip_conntrack_in_ops);
+	if (ret < 0) {
+		printk("ip_conntrack: can't register pre-routing hook.\n");
+		goto cleanup_defraglocalops;
+	}
+	ret = nf_register_hook(&ip_conntrack_local_out_ops);
+	if (ret < 0) {
+		printk("ip_conntrack: can't register local out hook.\n");
+		goto cleanup_inops;
+	}
+	ret = nf_register_hook(&ip_conntrack_out_ops);
+	if (ret < 0) {
+		printk("ip_conntrack: can't register post-routing hook.\n");
+		goto cleanup_inandlocalops;
+	}
+	ret = nf_register_hook(&ip_conntrack_local_in_ops);
+	if (ret < 0) {
+		printk("ip_conntrack: can't register local in hook.\n");
+		goto cleanup_inoutandlocalops;
+	}
+#ifdef CONFIG_SYSCTL
+	ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table, 0);
+	if (ip_ct_sysctl_header == NULL) {
+		printk("ip_conntrack: can't register to sysctl.\n");
+		ret = -ENOMEM;
+		goto cleanup_localinops;
+	}
+#endif
+
+	return ret;
+
+ cleanup:
+#ifdef CONFIG_SYSCTL
+ 	unregister_sysctl_table(ip_ct_sysctl_header);
+ cleanup_localinops:
+#endif
+	nf_unregister_hook(&ip_conntrack_local_in_ops);
+ cleanup_inoutandlocalops:
+	nf_unregister_hook(&ip_conntrack_out_ops);
+ cleanup_inandlocalops:
+	nf_unregister_hook(&ip_conntrack_local_out_ops);
+ cleanup_inops:
+	nf_unregister_hook(&ip_conntrack_in_ops);
+ cleanup_defraglocalops:
+	nf_unregister_hook(&ip_conntrack_defrag_local_out_ops);
+ cleanup_defragops:
+	nf_unregister_hook(&ip_conntrack_defrag_ops);
+ cleanup_proc_stat:
+#ifdef CONFIG_PROC_FS
+	remove_proc_entry("ip_conntrack", proc_net_stat);
+ cleanup_proc_exp:
+	proc_net_remove("ip_conntrack_expect");
+ cleanup_proc:
+	proc_net_remove("ip_conntrack");
+ cleanup_init:
+#endif /* CONFIG_PROC_FS */
+	ip_conntrack_cleanup();
+ cleanup_nothing:
+	return ret;
+}
+
+/* FIXME: Allow NULL functions and sub in pointers to generic for
+   them. --RR */
+int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto)
+{
+	int ret = 0;
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	if (ip_ct_protos[proto->proto] != &ip_conntrack_generic_protocol) {
+		ret = -EBUSY;
+		goto out;
+	}
+	ip_ct_protos[proto->proto] = proto;
+ out:
+	WRITE_UNLOCK(&ip_conntrack_lock);
+	return ret;
+}
+
+void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto)
+{
+	WRITE_LOCK(&ip_conntrack_lock);
+	ip_ct_protos[proto->proto] = &ip_conntrack_generic_protocol;
+	WRITE_UNLOCK(&ip_conntrack_lock);
+	
+	/* Somebody could be still looking at the proto in bh. */
+	synchronize_net();
+
+	/* Remove all contrack entries for this protocol */
+	ip_ct_iterate_cleanup(kill_proto, &proto->proto);
+}
+
+static int __init init(void)
+{
+	return init_or_cleanup(1);
+}
+
+static void __exit fini(void)
+{
+	init_or_cleanup(0);
+}
+
+module_init(init);
+module_exit(fini);
+
+/* Some modules need us, but don't depend directly on any symbol.
+   They should call this. */
+void need_ip_conntrack(void)
+{
+}
+
+EXPORT_SYMBOL(ip_conntrack_protocol_register);
+EXPORT_SYMBOL(ip_conntrack_protocol_unregister);
+EXPORT_SYMBOL(ip_ct_get_tuple);
+EXPORT_SYMBOL(invert_tuplepr);
+EXPORT_SYMBOL(ip_conntrack_alter_reply);
+EXPORT_SYMBOL(ip_conntrack_destroyed);
+EXPORT_SYMBOL(need_ip_conntrack);
+EXPORT_SYMBOL(ip_conntrack_helper_register);
+EXPORT_SYMBOL(ip_conntrack_helper_unregister);
+EXPORT_SYMBOL(ip_ct_iterate_cleanup);
+EXPORT_SYMBOL(ip_ct_refresh_acct);
+EXPORT_SYMBOL(ip_ct_protos);
+EXPORT_SYMBOL(ip_ct_find_proto);
+EXPORT_SYMBOL(ip_conntrack_expect_alloc);
+EXPORT_SYMBOL(ip_conntrack_expect_free);
+EXPORT_SYMBOL(ip_conntrack_expect_related);
+EXPORT_SYMBOL(ip_conntrack_unexpect_related);
+EXPORT_SYMBOL(ip_conntrack_tuple_taken);
+EXPORT_SYMBOL(ip_ct_gather_frags);
+EXPORT_SYMBOL(ip_conntrack_htable_size);
+EXPORT_SYMBOL(ip_conntrack_lock);
+EXPORT_SYMBOL(ip_conntrack_hash);
+EXPORT_SYMBOL(ip_conntrack_untracked);
+EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
+EXPORT_SYMBOL_GPL(ip_conntrack_put);
+#ifdef CONFIG_IP_NF_NAT_NEEDED
+EXPORT_SYMBOL(ip_conntrack_tcp_update);
+#endif
diff --git a/net/ipv4/netfilter/ip_conntrack_tftp.c b/net/ipv4/netfilter/ip_conntrack_tftp.c
new file mode 100644
index 000000000000..992fac3e36ee
--- /dev/null
+++ b/net/ipv4/netfilter/ip_conntrack_tftp.c
@@ -0,0 +1,159 @@
+/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Version: 0.0.7
+ *
+ * Thu 21 Mar 2002 Harald Welte <laforge@gnumonks.org>
+ * 	- port to newnat API
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_tftp.h>
+#include <linux/moduleparam.h>
+
+MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
+MODULE_DESCRIPTION("tftp connection tracking helper");
+MODULE_LICENSE("GPL");
+
+#define MAX_PORTS 8
+static int ports[MAX_PORTS];
+static int ports_c;
+module_param_array(ports, int, &ports_c, 0400);
+MODULE_PARM_DESC(ports, "port numbers of tftp servers");
+
+#if 0
+#define DEBUGP(format, args...) printk("%s:%s:" format, \
+                                       __FILE__, __FUNCTION__ , ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+unsigned int (*ip_nat_tftp_hook)(struct sk_buff **pskb,
+				 enum ip_conntrack_info ctinfo,
+				 struct ip_conntrack_expect *exp);
+EXPORT_SYMBOL_GPL(ip_nat_tftp_hook);
+
+static int tftp_help(struct sk_buff **pskb,
+		     struct ip_conntrack *ct,
+		     enum ip_conntrack_info ctinfo)
+{
+	struct tftphdr _tftph, *tfh;
+	struct ip_conntrack_expect *exp;
+	unsigned int ret = NF_ACCEPT;
+
+	tfh = skb_header_pointer(*pskb,
+				 (*pskb)->nh.iph->ihl*4+sizeof(struct udphdr),
+				 sizeof(_tftph), &_tftph);
+	if (tfh == NULL)
+		return NF_ACCEPT;
+
+	switch (ntohs(tfh->opcode)) {
+	/* RRQ and WRQ works the same way */
+	case TFTP_OPCODE_READ:
+	case TFTP_OPCODE_WRITE:
+		DEBUGP("");
+		DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+		DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+		exp = ip_conntrack_expect_alloc();
+		if (exp == NULL)
+			return NF_DROP;
+
+		exp->tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+		exp->mask.src.ip = 0xffffffff;
+		exp->mask.dst.ip = 0xffffffff;
+		exp->mask.dst.u.udp.port = 0xffff;
+		exp->mask.dst.protonum = 0xff;
+		exp->expectfn = NULL;
+		exp->master = ct;
+
+		DEBUGP("expect: ");
+		DUMP_TUPLE(&exp->tuple);
+		DUMP_TUPLE(&exp->mask);
+		if (ip_nat_tftp_hook)
+			ret = ip_nat_tftp_hook(pskb, ctinfo, exp);
+		else if (ip_conntrack_expect_related(exp) != 0) {
+			ip_conntrack_expect_free(exp);
+			ret = NF_DROP;
+		}
+		break;
+	case TFTP_OPCODE_DATA:
+	case TFTP_OPCODE_ACK:
+		DEBUGP("Data/ACK opcode\n");
+		break;
+	case TFTP_OPCODE_ERROR:
+		DEBUGP("Error opcode\n");
+		break;
+	default:
+		DEBUGP("Unknown opcode\n");
+	}
+	return NF_ACCEPT;
+}
+
+static struct ip_conntrack_helper tftp[MAX_PORTS];
+static char tftp_names[MAX_PORTS][10];
+
+static void fini(void)
+{
+	int i;
+
+	for (i = 0 ; i < ports_c; i++) {
+		DEBUGP("unregistering helper for port %d\n",
+			ports[i]);
+		ip_conntrack_helper_unregister(&tftp[i]);
+	} 
+}
+
+static int __init init(void)
+{
+	int i, ret;
+	char *tmpname;
+
+	if (ports_c == 0)
+		ports[ports_c++] = TFTP_PORT;
+
+	for (i = 0; i < ports_c; i++) {
+		/* Create helper structure */
+		memset(&tftp[i], 0, sizeof(struct ip_conntrack_helper));
+
+		tftp[i].tuple.dst.protonum = IPPROTO_UDP;
+		tftp[i].tuple.src.u.udp.port = htons(ports[i]);
+		tftp[i].mask.dst.protonum = 0xFF;
+		tftp[i].mask.src.u.udp.port = 0xFFFF;
+		tftp[i].max_expected = 1;
+		tftp[i].timeout = 5 * 60; /* 5 minutes */
+		tftp[i].me = THIS_MODULE;
+		tftp[i].help = tftp_help;
+
+		tmpname = &tftp_names[i][0];
+		if (ports[i] == TFTP_PORT)
+			sprintf(tmpname, "tftp");
+		else
+			sprintf(tmpname, "tftp-%d", i);
+		tftp[i].name = tmpname;
+
+		DEBUGP("port #%d: %d\n", i, ports[i]);
+
+		ret=ip_conntrack_helper_register(&tftp[i]);
+		if (ret) {
+			printk("ERROR registering helper for port %d\n",
+				ports[i]);
+			fini();
+			return(ret);
+		}
+	}
+	return(0);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_nat_amanda.c b/net/ipv4/netfilter/ip_nat_amanda.c
new file mode 100644
index 000000000000..da1f412583ed
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_amanda.c
@@ -0,0 +1,88 @@
+/* Amanda extension for TCP NAT alteration.
+ * (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
+ * based on a copy of HW's ip_nat_irc.c as well as other modules
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *
+ *	Module load syntax:
+ * 	insmod ip_nat_amanda.o
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
+
+
+MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");
+MODULE_DESCRIPTION("Amanda NAT helper");
+MODULE_LICENSE("GPL");
+
+static unsigned int help(struct sk_buff **pskb,
+			 enum ip_conntrack_info ctinfo,
+			 unsigned int matchoff,
+			 unsigned int matchlen,
+			 struct ip_conntrack_expect *exp)
+{
+	char buffer[sizeof("65535")];
+	u_int16_t port;
+	unsigned int ret;
+
+	/* Connection comes from client. */
+	exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+	exp->dir = IP_CT_DIR_ORIGINAL;
+
+	/* When you see the packet, we need to NAT it the same as the
+	 * this one (ie. same IP: it will be TCP and master is UDP). */
+	exp->expectfn = ip_nat_follow_master;
+
+	/* Try to get same port: if not, try to change it. */
+	for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
+		exp->tuple.dst.u.tcp.port = htons(port);
+		if (ip_conntrack_expect_related(exp) == 0)
+			break;
+	}
+
+	if (port == 0) {
+		ip_conntrack_expect_free(exp);
+		return NF_DROP;
+	}
+
+	sprintf(buffer, "%u", port);
+	ret = ip_nat_mangle_udp_packet(pskb, exp->master, ctinfo,
+				       matchoff, matchlen,
+				       buffer, strlen(buffer));
+	if (ret != NF_ACCEPT)
+		ip_conntrack_unexpect_related(exp);
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	ip_nat_amanda_hook = NULL;
+	/* Make sure noone calls it, meanwhile. */
+	synchronize_net();
+}
+
+static int __init init(void)
+{
+	BUG_ON(ip_nat_amanda_hook);
+	ip_nat_amanda_hook = help;
+	return 0;
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_nat_core.c b/net/ipv4/netfilter/ip_nat_core.c
new file mode 100644
index 000000000000..162ceacfc29a
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_core.c
@@ -0,0 +1,556 @@
+/* NAT for netfilter; shared with compatibility layer. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/vmalloc.h>
+#include <net/checksum.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/tcp.h>  /* For tcp_prot in getorigdst */
+#include <linux/icmp.h>
+#include <linux/udp.h>
+#include <linux/jhash.h>
+
+#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_nat_lock)
+#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_nat_lock)
+
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+#include <linux/netfilter_ipv4/ip_nat_core.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+DECLARE_RWLOCK(ip_nat_lock);
+
+/* Calculated at init based on memory size */
+static unsigned int ip_nat_htable_size;
+
+static struct list_head *bysource;
+struct ip_nat_protocol *ip_nat_protos[MAX_IP_NAT_PROTO];
+
+
+/* We keep an extra hash for each conntrack, for fast searching. */
+static inline unsigned int
+hash_by_src(const struct ip_conntrack_tuple *tuple)
+{
+	/* Original src, to ensure we map it consistently if poss. */
+	return jhash_3words(tuple->src.ip, tuple->src.u.all,
+			    tuple->dst.protonum, 0) % ip_nat_htable_size;
+}
+
+/* Noone using conntrack by the time this called. */
+static void ip_nat_cleanup_conntrack(struct ip_conntrack *conn)
+{
+	if (!(conn->status & IPS_NAT_DONE_MASK))
+		return;
+
+	WRITE_LOCK(&ip_nat_lock);
+	list_del(&conn->nat.info.bysource);
+	WRITE_UNLOCK(&ip_nat_lock);
+}
+
+/* We do checksum mangling, so if they were wrong before they're still
+ * wrong.  Also works for incomplete packets (eg. ICMP dest
+ * unreachables.) */
+u_int16_t
+ip_nat_cheat_check(u_int32_t oldvalinv, u_int32_t newval, u_int16_t oldcheck)
+{
+	u_int32_t diffs[] = { oldvalinv, newval };
+	return csum_fold(csum_partial((char *)diffs, sizeof(diffs),
+				      oldcheck^0xFFFF));
+}
+
+/* Is this tuple already taken? (not by us) */
+int
+ip_nat_used_tuple(const struct ip_conntrack_tuple *tuple,
+		  const struct ip_conntrack *ignored_conntrack)
+{
+	/* Conntrack tracking doesn't keep track of outgoing tuples; only
+	   incoming ones.  NAT means they don't have a fixed mapping,
+	   so we invert the tuple and look for the incoming reply.
+
+	   We could keep a separate hash if this proves too slow. */
+	struct ip_conntrack_tuple reply;
+
+	invert_tuplepr(&reply, tuple);
+	return ip_conntrack_tuple_taken(&reply, ignored_conntrack);
+}
+
+/* If we source map this tuple so reply looks like reply_tuple, will
+ * that meet the constraints of range. */
+static int
+in_range(const struct ip_conntrack_tuple *tuple,
+	 const struct ip_nat_range *range)
+{
+	struct ip_nat_protocol *proto = ip_nat_find_proto(tuple->dst.protonum);
+
+	/* If we are supposed to map IPs, then we must be in the
+	   range specified, otherwise let this drag us onto a new src IP. */
+	if (range->flags & IP_NAT_RANGE_MAP_IPS) {
+		if (ntohl(tuple->src.ip) < ntohl(range->min_ip)
+		    || ntohl(tuple->src.ip) > ntohl(range->max_ip))
+			return 0;
+	}
+
+	if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)
+	    || proto->in_range(tuple, IP_NAT_MANIP_SRC,
+			       &range->min, &range->max))
+		return 1;
+
+	return 0;
+}
+
+static inline int
+same_src(const struct ip_conntrack *ct,
+	 const struct ip_conntrack_tuple *tuple)
+{
+	return (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum
+		== tuple->dst.protonum
+		&& ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip
+		== tuple->src.ip
+		&& ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.all
+		== tuple->src.u.all);
+}
+
+/* Only called for SRC manip */
+static int
+find_appropriate_src(const struct ip_conntrack_tuple *tuple,
+		     struct ip_conntrack_tuple *result,
+		     const struct ip_nat_range *range)
+{
+	unsigned int h = hash_by_src(tuple);
+	struct ip_conntrack *ct;
+
+	READ_LOCK(&ip_nat_lock);
+	list_for_each_entry(ct, &bysource[h], nat.info.bysource) {
+		if (same_src(ct, tuple)) {
+			/* Copy source part from reply tuple. */
+			invert_tuplepr(result,
+				       &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+			result->dst = tuple->dst;
+
+			if (in_range(result, range)) {
+				READ_UNLOCK(&ip_nat_lock);
+				return 1;
+			}
+		}
+	}
+	READ_UNLOCK(&ip_nat_lock);
+	return 0;
+}
+
+/* For [FUTURE] fragmentation handling, we want the least-used
+   src-ip/dst-ip/proto triple.  Fairness doesn't come into it.  Thus
+   if the range specifies 1.2.3.4 ports 10000-10005 and 1.2.3.5 ports
+   1-65535, we don't do pro-rata allocation based on ports; we choose
+   the ip with the lowest src-ip/dst-ip/proto usage.
+*/
+static void
+find_best_ips_proto(struct ip_conntrack_tuple *tuple,
+		    const struct ip_nat_range *range,
+		    const struct ip_conntrack *conntrack,
+		    enum ip_nat_manip_type maniptype)
+{
+	u_int32_t *var_ipp;
+	/* Host order */
+	u_int32_t minip, maxip, j;
+
+	/* No IP mapping?  Do nothing. */
+	if (!(range->flags & IP_NAT_RANGE_MAP_IPS))
+		return;
+
+	if (maniptype == IP_NAT_MANIP_SRC)
+		var_ipp = &tuple->src.ip;
+	else
+		var_ipp = &tuple->dst.ip;
+
+	/* Fast path: only one choice. */
+	if (range->min_ip == range->max_ip) {
+		*var_ipp = range->min_ip;
+		return;
+	}
+
+	/* Hashing source and destination IPs gives a fairly even
+	 * spread in practice (if there are a small number of IPs
+	 * involved, there usually aren't that many connections
+	 * anyway).  The consistency means that servers see the same
+	 * client coming from the same IP (some Internet Banking sites
+	 * like this), even across reboots. */
+	minip = ntohl(range->min_ip);
+	maxip = ntohl(range->max_ip);
+	j = jhash_2words(tuple->src.ip, tuple->dst.ip, 0);
+	*var_ipp = htonl(minip + j % (maxip - minip + 1));
+}
+
+/* Manipulate the tuple into the range given.  For NF_IP_POST_ROUTING,
+ * we change the source to map into the range.  For NF_IP_PRE_ROUTING
+ * and NF_IP_LOCAL_OUT, we change the destination to map into the
+ * range.  It might not be possible to get a unique tuple, but we try.
+ * At worst (or if we race), we will end up with a final duplicate in
+ * __ip_conntrack_confirm and drop the packet. */
+static void
+get_unique_tuple(struct ip_conntrack_tuple *tuple,
+		 const struct ip_conntrack_tuple *orig_tuple,
+		 const struct ip_nat_range *range,
+		 struct ip_conntrack *conntrack,
+		 enum ip_nat_manip_type maniptype)
+{
+	struct ip_nat_protocol *proto
+		= ip_nat_find_proto(orig_tuple->dst.protonum);
+
+	/* 1) If this srcip/proto/src-proto-part is currently mapped,
+	   and that same mapping gives a unique tuple within the given
+	   range, use that.
+
+	   This is only required for source (ie. NAT/masq) mappings.
+	   So far, we don't do local source mappings, so multiple
+	   manips not an issue.  */
+	if (maniptype == IP_NAT_MANIP_SRC) {
+		if (find_appropriate_src(orig_tuple, tuple, range)) {
+			DEBUGP("get_unique_tuple: Found current src map\n");
+			if (!ip_nat_used_tuple(tuple, conntrack))
+				return;
+		}
+	}
+
+	/* 2) Select the least-used IP/proto combination in the given
+	   range. */
+	*tuple = *orig_tuple;
+	find_best_ips_proto(tuple, range, conntrack, maniptype);
+
+	/* 3) The per-protocol part of the manip is made to map into
+	   the range to make a unique tuple. */
+
+	/* Only bother mapping if it's not already in range and unique */
+	if ((!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)
+	     || proto->in_range(tuple, maniptype, &range->min, &range->max))
+	    && !ip_nat_used_tuple(tuple, conntrack))
+		return;
+
+	/* Last change: get protocol to try to obtain unique tuple. */
+	proto->unique_tuple(tuple, range, maniptype, conntrack);
+}
+
+unsigned int
+ip_nat_setup_info(struct ip_conntrack *conntrack,
+		  const struct ip_nat_range *range,
+		  unsigned int hooknum)
+{
+	struct ip_conntrack_tuple curr_tuple, new_tuple;
+	struct ip_nat_info *info = &conntrack->nat.info;
+	int have_to_hash = !(conntrack->status & IPS_NAT_DONE_MASK);
+	enum ip_nat_manip_type maniptype = HOOK2MANIP(hooknum);
+
+	IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
+		     || hooknum == NF_IP_POST_ROUTING
+		     || hooknum == NF_IP_LOCAL_IN
+		     || hooknum == NF_IP_LOCAL_OUT);
+	BUG_ON(ip_nat_initialized(conntrack, maniptype));
+
+	/* What we've got will look like inverse of reply. Normally
+	   this is what is in the conntrack, except for prior
+	   manipulations (future optimization: if num_manips == 0,
+	   orig_tp =
+	   conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple) */
+	invert_tuplepr(&curr_tuple,
+		       &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+	get_unique_tuple(&new_tuple, &curr_tuple, range, conntrack, maniptype);
+
+	if (!ip_ct_tuple_equal(&new_tuple, &curr_tuple)) {
+		struct ip_conntrack_tuple reply;
+
+		/* Alter conntrack table so will recognize replies. */
+		invert_tuplepr(&reply, &new_tuple);
+		ip_conntrack_alter_reply(conntrack, &reply);
+
+		/* Non-atomic: we own this at the moment. */
+		if (maniptype == IP_NAT_MANIP_SRC)
+			conntrack->status |= IPS_SRC_NAT;
+		else
+			conntrack->status |= IPS_DST_NAT;
+	}
+
+	/* Place in source hash if this is the first time. */
+	if (have_to_hash) {
+		unsigned int srchash
+			= hash_by_src(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
+				      .tuple);
+		WRITE_LOCK(&ip_nat_lock);
+		list_add(&info->bysource, &bysource[srchash]);
+		WRITE_UNLOCK(&ip_nat_lock);
+	}
+
+	/* It's done. */
+	if (maniptype == IP_NAT_MANIP_DST)
+		set_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
+	else
+		set_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
+
+	return NF_ACCEPT;
+}
+
+/* Returns true if succeeded. */
+static int
+manip_pkt(u_int16_t proto,
+	  struct sk_buff **pskb,
+	  unsigned int iphdroff,
+	  const struct ip_conntrack_tuple *target,
+	  enum ip_nat_manip_type maniptype)
+{
+	struct iphdr *iph;
+
+	(*pskb)->nfcache |= NFC_ALTERED;
+	if (!skb_ip_make_writable(pskb, iphdroff + sizeof(*iph)))
+		return 0;
+
+	iph = (void *)(*pskb)->data + iphdroff;
+
+	/* Manipulate protcol part. */
+	if (!ip_nat_find_proto(proto)->manip_pkt(pskb, iphdroff,
+	                                         target, maniptype))
+		return 0;
+
+	iph = (void *)(*pskb)->data + iphdroff;
+
+	if (maniptype == IP_NAT_MANIP_SRC) {
+		iph->check = ip_nat_cheat_check(~iph->saddr, target->src.ip,
+						iph->check);
+		iph->saddr = target->src.ip;
+	} else {
+		iph->check = ip_nat_cheat_check(~iph->daddr, target->dst.ip,
+						iph->check);
+		iph->daddr = target->dst.ip;
+	}
+	return 1;
+}
+
+/* Do packet manipulations according to ip_nat_setup_info. */
+unsigned int nat_packet(struct ip_conntrack *ct,
+			enum ip_conntrack_info ctinfo,
+			unsigned int hooknum,
+			struct sk_buff **pskb)
+{
+	enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+	unsigned long statusbit;
+	enum ip_nat_manip_type mtype = HOOK2MANIP(hooknum);
+
+	if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)
+	    && (hooknum == NF_IP_POST_ROUTING || hooknum == NF_IP_LOCAL_IN)) {
+		DEBUGP("ip_nat_core: adjusting sequence number\n");
+		/* future: put this in a l4-proto specific function,
+		 * and call this function here. */
+		if (!ip_nat_seq_adjust(pskb, ct, ctinfo))
+			return NF_DROP;
+	}
+
+	if (mtype == IP_NAT_MANIP_SRC)
+		statusbit = IPS_SRC_NAT;
+	else
+		statusbit = IPS_DST_NAT;
+
+	/* Invert if this is reply dir. */
+	if (dir == IP_CT_DIR_REPLY)
+		statusbit ^= IPS_NAT_MASK;
+
+	/* Non-atomic: these bits don't change. */
+	if (ct->status & statusbit) {
+		struct ip_conntrack_tuple target;
+
+		/* We are aiming to look like inverse of other direction. */
+		invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
+
+		if (!manip_pkt(target.dst.protonum, pskb, 0, &target, mtype))
+			return NF_DROP;
+	}
+	return NF_ACCEPT;
+}
+
+/* Dir is direction ICMP is coming from (opposite to packet it contains) */
+int icmp_reply_translation(struct sk_buff **pskb,
+			   struct ip_conntrack *ct,
+			   enum ip_nat_manip_type manip,
+			   enum ip_conntrack_dir dir)
+{
+	struct {
+		struct icmphdr icmp;
+		struct iphdr ip;
+	} *inside;
+	struct ip_conntrack_tuple inner, target;
+	int hdrlen = (*pskb)->nh.iph->ihl * 4;
+
+	if (!skb_ip_make_writable(pskb, hdrlen + sizeof(*inside)))
+		return 0;
+
+	inside = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
+
+	/* We're actually going to mangle it beyond trivial checksum
+	   adjustment, so make sure the current checksum is correct. */
+	if ((*pskb)->ip_summed != CHECKSUM_UNNECESSARY) {
+		hdrlen = (*pskb)->nh.iph->ihl * 4;
+		if ((u16)csum_fold(skb_checksum(*pskb, hdrlen,
+						(*pskb)->len - hdrlen, 0)))
+			return 0;
+	}
+
+	/* Must be RELATED */
+	IP_NF_ASSERT((*pskb)->nfctinfo == IP_CT_RELATED ||
+		     (*pskb)->nfctinfo == IP_CT_RELATED+IP_CT_IS_REPLY);
+
+	/* Redirects on non-null nats must be dropped, else they'll
+           start talking to each other without our translation, and be
+           confused... --RR */
+	if (inside->icmp.type == ICMP_REDIRECT) {
+		/* If NAT isn't finished, assume it and drop. */
+		if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
+			return 0;
+
+		if (ct->status & IPS_NAT_MASK)
+			return 0;
+	}
+
+	DEBUGP("icmp_reply_translation: translating error %p manp %u dir %s\n",
+	       *pskb, manip, dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY");
+
+	if (!ip_ct_get_tuple(&inside->ip, *pskb, (*pskb)->nh.iph->ihl*4 +
+	                     sizeof(struct icmphdr) + inside->ip.ihl*4,
+	                     &inner, ip_ct_find_proto(inside->ip.protocol)))
+		return 0;
+
+	/* Change inner back to look like incoming packet.  We do the
+	   opposite manip on this hook to normal, because it might not
+	   pass all hooks (locally-generated ICMP).  Consider incoming
+	   packet: PREROUTING (DST manip), routing produces ICMP, goes
+	   through POSTROUTING (which must correct the DST manip). */
+	if (!manip_pkt(inside->ip.protocol, pskb,
+		       (*pskb)->nh.iph->ihl*4
+		       + sizeof(inside->icmp),
+		       &ct->tuplehash[!dir].tuple,
+		       !manip))
+		return 0;
+
+	/* Reloading "inside" here since manip_pkt inner. */
+	inside = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
+	inside->icmp.checksum = 0;
+	inside->icmp.checksum = csum_fold(skb_checksum(*pskb, hdrlen,
+						       (*pskb)->len - hdrlen,
+						       0));
+
+	/* Change outer to look the reply to an incoming packet
+	 * (proto 0 means don't invert per-proto part). */
+
+	/* Obviously, we need to NAT destination IP, but source IP
+	   should be NAT'ed only if it is from a NAT'd host.
+
+	   Explanation: some people use NAT for anonymizing.  Also,
+	   CERT recommends dropping all packets from private IP
+	   addresses (although ICMP errors from internal links with
+	   such addresses are not too uncommon, as Alan Cox points
+	   out) */
+	if (manip != IP_NAT_MANIP_SRC
+	    || ((*pskb)->nh.iph->saddr == ct->tuplehash[dir].tuple.src.ip)) {
+		invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
+		if (!manip_pkt(0, pskb, 0, &target, manip))
+			return 0;
+	}
+
+	return 1;
+}
+
+/* Protocol registration. */
+int ip_nat_protocol_register(struct ip_nat_protocol *proto)
+{
+	int ret = 0;
+
+	WRITE_LOCK(&ip_nat_lock);
+	if (ip_nat_protos[proto->protonum] != &ip_nat_unknown_protocol) {
+		ret = -EBUSY;
+		goto out;
+	}
+	ip_nat_protos[proto->protonum] = proto;
+ out:
+	WRITE_UNLOCK(&ip_nat_lock);
+	return ret;
+}
+
+/* Noone stores the protocol anywhere; simply delete it. */
+void ip_nat_protocol_unregister(struct ip_nat_protocol *proto)
+{
+	WRITE_LOCK(&ip_nat_lock);
+	ip_nat_protos[proto->protonum] = &ip_nat_unknown_protocol;
+	WRITE_UNLOCK(&ip_nat_lock);
+
+	/* Someone could be still looking at the proto in a bh. */
+	synchronize_net();
+}
+
+int __init ip_nat_init(void)
+{
+	size_t i;
+
+	/* Leave them the same for the moment. */
+	ip_nat_htable_size = ip_conntrack_htable_size;
+
+	/* One vmalloc for both hash tables */
+	bysource = vmalloc(sizeof(struct list_head) * ip_nat_htable_size);
+	if (!bysource)
+		return -ENOMEM;
+
+	/* Sew in builtin protocols. */
+	WRITE_LOCK(&ip_nat_lock);
+	for (i = 0; i < MAX_IP_NAT_PROTO; i++)
+		ip_nat_protos[i] = &ip_nat_unknown_protocol;
+	ip_nat_protos[IPPROTO_TCP] = &ip_nat_protocol_tcp;
+	ip_nat_protos[IPPROTO_UDP] = &ip_nat_protocol_udp;
+	ip_nat_protos[IPPROTO_ICMP] = &ip_nat_protocol_icmp;
+	WRITE_UNLOCK(&ip_nat_lock);
+
+	for (i = 0; i < ip_nat_htable_size; i++) {
+		INIT_LIST_HEAD(&bysource[i]);
+	}
+
+	/* FIXME: Man, this is a hack.  <SIGH> */
+	IP_NF_ASSERT(ip_conntrack_destroyed == NULL);
+	ip_conntrack_destroyed = &ip_nat_cleanup_conntrack;
+
+	/* Initialize fake conntrack so that NAT will skip it */
+	ip_conntrack_untracked.status |= IPS_NAT_DONE_MASK;
+	return 0;
+}
+
+/* Clear NAT section of all conntracks, in case we're loaded again. */
+static int clean_nat(struct ip_conntrack *i, void *data)
+{
+	memset(&i->nat, 0, sizeof(i->nat));
+	i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
+	return 0;
+}
+
+/* Not __exit: called from ip_nat_standalone.c:init_or_cleanup() --RR */
+void ip_nat_cleanup(void)
+{
+	ip_ct_iterate_cleanup(&clean_nat, NULL);
+	ip_conntrack_destroyed = NULL;
+	vfree(bysource);
+}
diff --git a/net/ipv4/netfilter/ip_nat_ftp.c b/net/ipv4/netfilter/ip_nat_ftp.c
new file mode 100644
index 000000000000..c6000e794ad6
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_ftp.c
@@ -0,0 +1,183 @@
+/* FTP extension for TCP NAT alteration. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/moduleparam.h>
+#include <net/tcp.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
+MODULE_DESCRIPTION("ftp NAT helper");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* FIXME: Time out? --RR */
+
+static int
+mangle_rfc959_packet(struct sk_buff **pskb,
+		     u_int32_t newip,
+		     u_int16_t port,
+		     unsigned int matchoff,
+		     unsigned int matchlen,
+		     struct ip_conntrack *ct,
+		     enum ip_conntrack_info ctinfo,
+		     u32 *seq)
+{
+	char buffer[sizeof("nnn,nnn,nnn,nnn,nnn,nnn")];
+
+	sprintf(buffer, "%u,%u,%u,%u,%u,%u",
+		NIPQUAD(newip), port>>8, port&0xFF);
+
+	DEBUGP("calling ip_nat_mangle_tcp_packet\n");
+
+	*seq += strlen(buffer) - matchlen;
+	return ip_nat_mangle_tcp_packet(pskb, ct, ctinfo, matchoff, 
+					matchlen, buffer, strlen(buffer));
+}
+
+/* |1|132.235.1.2|6275| */
+static int
+mangle_eprt_packet(struct sk_buff **pskb,
+		   u_int32_t newip,
+		   u_int16_t port,
+		   unsigned int matchoff,
+		   unsigned int matchlen,
+		   struct ip_conntrack *ct,
+		   enum ip_conntrack_info ctinfo,
+		   u32 *seq)
+{
+	char buffer[sizeof("|1|255.255.255.255|65535|")];
+
+	sprintf(buffer, "|1|%u.%u.%u.%u|%u|", NIPQUAD(newip), port);
+
+	DEBUGP("calling ip_nat_mangle_tcp_packet\n");
+
+	*seq += strlen(buffer) - matchlen;
+	return ip_nat_mangle_tcp_packet(pskb, ct, ctinfo, matchoff, 
+					matchlen, buffer, strlen(buffer));
+}
+
+/* |1|132.235.1.2|6275| */
+static int
+mangle_epsv_packet(struct sk_buff **pskb,
+		   u_int32_t newip,
+		   u_int16_t port,
+		   unsigned int matchoff,
+		   unsigned int matchlen,
+		   struct ip_conntrack *ct,
+		   enum ip_conntrack_info ctinfo,
+		   u32 *seq)
+{
+	char buffer[sizeof("|||65535|")];
+
+	sprintf(buffer, "|||%u|", port);
+
+	DEBUGP("calling ip_nat_mangle_tcp_packet\n");
+
+	*seq += strlen(buffer) - matchlen;
+	return ip_nat_mangle_tcp_packet(pskb, ct, ctinfo, matchoff, 
+					matchlen, buffer, strlen(buffer));
+}
+
+static int (*mangle[])(struct sk_buff **, u_int32_t, u_int16_t,
+		     unsigned int,
+		     unsigned int,
+		     struct ip_conntrack *,
+		     enum ip_conntrack_info,
+		     u32 *seq)
+= { [IP_CT_FTP_PORT] = mangle_rfc959_packet,
+    [IP_CT_FTP_PASV] = mangle_rfc959_packet,
+    [IP_CT_FTP_EPRT] = mangle_eprt_packet,
+    [IP_CT_FTP_EPSV] = mangle_epsv_packet
+};
+
+/* So, this packet has hit the connection tracking matching code.
+   Mangle it, and change the expectation to match the new version. */
+static unsigned int ip_nat_ftp(struct sk_buff **pskb,
+			       enum ip_conntrack_info ctinfo,
+			       enum ip_ct_ftp_type type,
+			       unsigned int matchoff,
+			       unsigned int matchlen,
+			       struct ip_conntrack_expect *exp,
+			       u32 *seq)
+{
+	u_int32_t newip;
+	u_int16_t port;
+	int dir = CTINFO2DIR(ctinfo);
+	struct ip_conntrack *ct = exp->master;
+
+	DEBUGP("FTP_NAT: type %i, off %u len %u\n", type, matchoff, matchlen);
+
+	/* Connection will come from wherever this packet goes, hence !dir */
+	newip = ct->tuplehash[!dir].tuple.dst.ip;
+	exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+	exp->dir = !dir;
+
+	/* When you see the packet, we need to NAT it the same as the
+	 * this one. */
+	exp->expectfn = ip_nat_follow_master;
+
+	/* Try to get same port: if not, try to change it. */
+	for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
+		exp->tuple.dst.u.tcp.port = htons(port);
+		if (ip_conntrack_expect_related(exp) == 0)
+			break;
+	}
+
+	if (port == 0) {
+		ip_conntrack_expect_free(exp);
+		return NF_DROP;
+	}
+
+	if (!mangle[type](pskb, newip, port, matchoff, matchlen, ct, ctinfo,
+			  seq)) {
+		ip_conntrack_unexpect_related(exp);
+		return NF_DROP;
+	}
+	return NF_ACCEPT;
+}
+
+static void __exit fini(void)
+{
+	ip_nat_ftp_hook = NULL;
+	/* Make sure noone calls it, meanwhile. */
+	synchronize_net();
+}
+
+static int __init init(void)
+{
+	BUG_ON(ip_nat_ftp_hook);
+	ip_nat_ftp_hook = ip_nat_ftp;
+	return 0;
+}
+
+/* Prior to 2.6.11, we had a ports param.  No longer, but don't break users. */
+static int warn_set(const char *val, struct kernel_param *kp)
+{
+	printk(KERN_INFO __stringify(KBUILD_MODNAME)
+	       ": kernel >= 2.6.10 only uses 'ports' for conntrack modules\n");
+	return 0;
+}
+module_param_call(ports, warn_set, NULL, NULL, 0);
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_nat_helper.c b/net/ipv4/netfilter/ip_nat_helper.c
new file mode 100644
index 000000000000..1637b96d8c01
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_helper.c
@@ -0,0 +1,430 @@
+/* ip_nat_helper.c - generic support functions for NAT helpers 
+ *
+ * (C) 2000-2002 Harald Welte <laforge@netfilter.org>
+ * (C) 2003-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 	14 Jan 2002 Harald Welte <laforge@gnumonks.org>:
+ *		- add support for SACK adjustment 
+ *	14 Mar 2002 Harald Welte <laforge@gnumonks.org>:
+ *		- merge SACK support into newnat API
+ *	16 Aug 2002 Brian J. Murrell <netfilter@interlinx.bc.ca>:
+ *		- make ip_nat_resize_packet more generic (TCP and UDP)
+ *		- add ip_nat_mangle_udp_packet
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4.h>
+#include <net/checksum.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+
+#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_nat_lock)
+#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_nat_lock)
+
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+#include <linux/netfilter_ipv4/ip_nat_core.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#if 0
+#define DEBUGP printk
+#define DUMP_OFFSET(x)	printk("offset_before=%d, offset_after=%d, correction_pos=%u\n", x->offset_before, x->offset_after, x->correction_pos);
+#else
+#define DEBUGP(format, args...)
+#define DUMP_OFFSET(x)
+#endif
+
+static DECLARE_LOCK(ip_nat_seqofs_lock);
+
+/* Setup TCP sequence correction given this change at this sequence */
+static inline void 
+adjust_tcp_sequence(u32 seq,
+		    int sizediff,
+		    struct ip_conntrack *ct, 
+		    enum ip_conntrack_info ctinfo)
+{
+	int dir;
+	struct ip_nat_seq *this_way, *other_way;
+
+	DEBUGP("ip_nat_resize_packet: old_size = %u, new_size = %u\n",
+		(*skb)->len, new_size);
+
+	dir = CTINFO2DIR(ctinfo);
+
+	this_way = &ct->nat.info.seq[dir];
+	other_way = &ct->nat.info.seq[!dir];
+
+	DEBUGP("ip_nat_resize_packet: Seq_offset before: ");
+	DUMP_OFFSET(this_way);
+
+	LOCK_BH(&ip_nat_seqofs_lock);
+
+	/* SYN adjust. If it's uninitialized, or this is after last
+	 * correction, record it: we don't handle more than one
+	 * adjustment in the window, but do deal with common case of a
+	 * retransmit */
+	if (this_way->offset_before == this_way->offset_after
+	    || before(this_way->correction_pos, seq)) {
+		    this_way->correction_pos = seq;
+		    this_way->offset_before = this_way->offset_after;
+		    this_way->offset_after += sizediff;
+	}
+	UNLOCK_BH(&ip_nat_seqofs_lock);
+
+	DEBUGP("ip_nat_resize_packet: Seq_offset after: ");
+	DUMP_OFFSET(this_way);
+}
+
+/* Frobs data inside this packet, which is linear. */
+static void mangle_contents(struct sk_buff *skb,
+			    unsigned int dataoff,
+			    unsigned int match_offset,
+			    unsigned int match_len,
+			    const char *rep_buffer,
+			    unsigned int rep_len)
+{
+	unsigned char *data;
+
+	BUG_ON(skb_is_nonlinear(skb));
+	data = (unsigned char *)skb->nh.iph + dataoff;
+
+	/* move post-replacement */
+	memmove(data + match_offset + rep_len,
+		data + match_offset + match_len,
+		skb->tail - (data + match_offset + match_len));
+
+	/* insert data from buffer */
+	memcpy(data + match_offset, rep_buffer, rep_len);
+
+	/* update skb info */
+	if (rep_len > match_len) {
+		DEBUGP("ip_nat_mangle_packet: Extending packet by "
+			"%u from %u bytes\n", rep_len - match_len,
+		       skb->len);
+		skb_put(skb, rep_len - match_len);
+	} else {
+		DEBUGP("ip_nat_mangle_packet: Shrinking packet from "
+			"%u from %u bytes\n", match_len - rep_len,
+		       skb->len);
+		__skb_trim(skb, skb->len + rep_len - match_len);
+	}
+
+	/* fix IP hdr checksum information */
+	skb->nh.iph->tot_len = htons(skb->len);
+	ip_send_check(skb->nh.iph);
+}
+
+/* Unusual, but possible case. */
+static int enlarge_skb(struct sk_buff **pskb, unsigned int extra)
+{
+	struct sk_buff *nskb;
+
+	if ((*pskb)->len + extra > 65535)
+		return 0;
+
+	nskb = skb_copy_expand(*pskb, skb_headroom(*pskb), extra, GFP_ATOMIC);
+	if (!nskb)
+		return 0;
+
+	/* Transfer socket to new skb. */
+	if ((*pskb)->sk)
+		skb_set_owner_w(nskb, (*pskb)->sk);
+#ifdef CONFIG_NETFILTER_DEBUG
+	nskb->nf_debug = (*pskb)->nf_debug;
+#endif
+	kfree_skb(*pskb);
+	*pskb = nskb;
+	return 1;
+}
+
+/* Generic function for mangling variable-length address changes inside
+ * NATed TCP connections (like the PORT XXX,XXX,XXX,XXX,XXX,XXX
+ * command in FTP).
+ *
+ * Takes care about all the nasty sequence number changes, checksumming,
+ * skb enlargement, ...
+ *
+ * */
+int 
+ip_nat_mangle_tcp_packet(struct sk_buff **pskb,
+			 struct ip_conntrack *ct,
+			 enum ip_conntrack_info ctinfo,
+			 unsigned int match_offset,
+			 unsigned int match_len,
+			 const char *rep_buffer,
+			 unsigned int rep_len)
+{
+	struct iphdr *iph;
+	struct tcphdr *tcph;
+	int datalen;
+
+	if (!skb_ip_make_writable(pskb, (*pskb)->len))
+		return 0;
+
+	if (rep_len > match_len
+	    && rep_len - match_len > skb_tailroom(*pskb)
+	    && !enlarge_skb(pskb, rep_len - match_len))
+		return 0;
+
+	SKB_LINEAR_ASSERT(*pskb);
+
+	iph = (*pskb)->nh.iph;
+	tcph = (void *)iph + iph->ihl*4;
+
+	mangle_contents(*pskb, iph->ihl*4 + tcph->doff*4,
+			match_offset, match_len, rep_buffer, rep_len);
+
+	datalen = (*pskb)->len - iph->ihl*4;
+	tcph->check = 0;
+	tcph->check = tcp_v4_check(tcph, datalen, iph->saddr, iph->daddr,
+				   csum_partial((char *)tcph, datalen, 0));
+
+	if (rep_len != match_len) {
+		set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
+		adjust_tcp_sequence(ntohl(tcph->seq),
+				    (int)rep_len - (int)match_len,
+				    ct, ctinfo);
+		/* Tell TCP window tracking about seq change */
+		ip_conntrack_tcp_update(*pskb, ct, CTINFO2DIR(ctinfo));
+	}
+	return 1;
+}
+			
+/* Generic function for mangling variable-length address changes inside
+ * NATed UDP connections (like the CONNECT DATA XXXXX MESG XXXXX INDEX XXXXX
+ * command in the Amanda protocol)
+ *
+ * Takes care about all the nasty sequence number changes, checksumming,
+ * skb enlargement, ...
+ *
+ * XXX - This function could be merged with ip_nat_mangle_tcp_packet which
+ *       should be fairly easy to do.
+ */
+int 
+ip_nat_mangle_udp_packet(struct sk_buff **pskb,
+			 struct ip_conntrack *ct,
+			 enum ip_conntrack_info ctinfo,
+			 unsigned int match_offset,
+			 unsigned int match_len,
+			 const char *rep_buffer,
+			 unsigned int rep_len)
+{
+	struct iphdr *iph;
+	struct udphdr *udph;
+
+	/* UDP helpers might accidentally mangle the wrong packet */
+	iph = (*pskb)->nh.iph;
+	if ((*pskb)->len < iph->ihl*4 + sizeof(*udph) + 
+	                       match_offset + match_len)
+		return 0;
+
+	if (!skb_ip_make_writable(pskb, (*pskb)->len))
+		return 0;
+
+	if (rep_len > match_len
+	    && rep_len - match_len > skb_tailroom(*pskb)
+	    && !enlarge_skb(pskb, rep_len - match_len))
+		return 0;
+
+	iph = (*pskb)->nh.iph;
+	udph = (void *)iph + iph->ihl*4;
+	mangle_contents(*pskb, iph->ihl*4 + sizeof(*udph),
+			match_offset, match_len, rep_buffer, rep_len);
+
+	/* update the length of the UDP packet */
+	udph->len = htons((*pskb)->len - iph->ihl*4);
+
+	/* fix udp checksum if udp checksum was previously calculated */
+	if (udph->check) {
+		int datalen = (*pskb)->len - iph->ihl * 4;
+		udph->check = 0;
+		udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
+		                                datalen, IPPROTO_UDP,
+		                                csum_partial((char *)udph,
+		                                             datalen, 0));
+	}
+
+	return 1;
+}
+
+/* Adjust one found SACK option including checksum correction */
+static void
+sack_adjust(struct sk_buff *skb,
+	    struct tcphdr *tcph, 
+	    unsigned int sackoff,
+	    unsigned int sackend,
+	    struct ip_nat_seq *natseq)
+{
+	while (sackoff < sackend) {
+		struct tcp_sack_block *sack;
+		u_int32_t new_start_seq, new_end_seq;
+
+		sack = (void *)skb->data + sackoff;
+		if (after(ntohl(sack->start_seq) - natseq->offset_before,
+			  natseq->correction_pos))
+			new_start_seq = ntohl(sack->start_seq) 
+					- natseq->offset_after;
+		else
+			new_start_seq = ntohl(sack->start_seq) 
+					- natseq->offset_before;
+		new_start_seq = htonl(new_start_seq);
+
+		if (after(ntohl(sack->end_seq) - natseq->offset_before,
+			  natseq->correction_pos))
+			new_end_seq = ntohl(sack->end_seq)
+				      - natseq->offset_after;
+		else
+			new_end_seq = ntohl(sack->end_seq)
+				      - natseq->offset_before;
+		new_end_seq = htonl(new_end_seq);
+
+		DEBUGP("sack_adjust: start_seq: %d->%d, end_seq: %d->%d\n",
+			ntohl(sack->start_seq), new_start_seq,
+			ntohl(sack->end_seq), new_end_seq);
+
+		tcph->check = 
+			ip_nat_cheat_check(~sack->start_seq, new_start_seq,
+					   ip_nat_cheat_check(~sack->end_seq, 
+						   	      new_end_seq,
+							      tcph->check));
+		sack->start_seq = new_start_seq;
+		sack->end_seq = new_end_seq;
+		sackoff += sizeof(*sack);
+	}
+}
+
+/* TCP SACK sequence number adjustment */
+static inline unsigned int
+ip_nat_sack_adjust(struct sk_buff **pskb,
+		   struct tcphdr *tcph,
+		   struct ip_conntrack *ct,
+		   enum ip_conntrack_info ctinfo)
+{
+	unsigned int dir, optoff, optend;
+
+	optoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct tcphdr);
+	optend = (*pskb)->nh.iph->ihl*4 + tcph->doff*4;
+
+	if (!skb_ip_make_writable(pskb, optend))
+		return 0;
+
+	dir = CTINFO2DIR(ctinfo);
+
+	while (optoff < optend) {
+		/* Usually: option, length. */
+		unsigned char *op = (*pskb)->data + optoff;
+
+		switch (op[0]) {
+		case TCPOPT_EOL:
+			return 1;
+		case TCPOPT_NOP:
+			optoff++;
+			continue;
+		default:
+			/* no partial options */
+			if (optoff + 1 == optend
+			    || optoff + op[1] > optend
+			    || op[1] < 2)
+				return 0;
+			if (op[0] == TCPOPT_SACK
+			    && op[1] >= 2+TCPOLEN_SACK_PERBLOCK
+			    && ((op[1] - 2) % TCPOLEN_SACK_PERBLOCK) == 0)
+				sack_adjust(*pskb, tcph, optoff+2,
+					    optoff+op[1],
+					    &ct->nat.info.seq[!dir]);
+			optoff += op[1];
+		}
+	}
+	return 1;
+}
+
+/* TCP sequence number adjustment.  Returns 1 on success, 0 on failure */
+int
+ip_nat_seq_adjust(struct sk_buff **pskb, 
+		  struct ip_conntrack *ct, 
+		  enum ip_conntrack_info ctinfo)
+{
+	struct tcphdr *tcph;
+	int dir, newseq, newack;
+	struct ip_nat_seq *this_way, *other_way;	
+
+	dir = CTINFO2DIR(ctinfo);
+
+	this_way = &ct->nat.info.seq[dir];
+	other_way = &ct->nat.info.seq[!dir];
+
+	if (!skb_ip_make_writable(pskb, (*pskb)->nh.iph->ihl*4+sizeof(*tcph)))
+		return 0;
+
+	tcph = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
+	if (after(ntohl(tcph->seq), this_way->correction_pos))
+		newseq = ntohl(tcph->seq) + this_way->offset_after;
+	else
+		newseq = ntohl(tcph->seq) + this_way->offset_before;
+	newseq = htonl(newseq);
+
+	if (after(ntohl(tcph->ack_seq) - other_way->offset_before,
+		  other_way->correction_pos))
+		newack = ntohl(tcph->ack_seq) - other_way->offset_after;
+	else
+		newack = ntohl(tcph->ack_seq) - other_way->offset_before;
+	newack = htonl(newack);
+
+	tcph->check = ip_nat_cheat_check(~tcph->seq, newseq,
+					 ip_nat_cheat_check(~tcph->ack_seq, 
+					 		    newack, 
+							    tcph->check));
+
+	DEBUGP("Adjusting sequence number from %u->%u, ack from %u->%u\n",
+		ntohl(tcph->seq), ntohl(newseq), ntohl(tcph->ack_seq),
+		ntohl(newack));
+
+	tcph->seq = newseq;
+	tcph->ack_seq = newack;
+
+	if (!ip_nat_sack_adjust(pskb, tcph, ct, ctinfo))
+		return 0;
+
+	ip_conntrack_tcp_update(*pskb, ct, dir);
+
+	return 1;
+}
+
+/* Setup NAT on this expected conntrack so it follows master. */
+/* If we fail to get a free NAT slot, we'll get dropped on confirm */
+void ip_nat_follow_master(struct ip_conntrack *ct,
+			  struct ip_conntrack_expect *exp)
+{
+	struct ip_nat_range range;
+
+	/* This must be a fresh one. */
+	BUG_ON(ct->status & IPS_NAT_DONE_MASK);
+
+	/* Change src to where master sends to */
+	range.flags = IP_NAT_RANGE_MAP_IPS;
+	range.min_ip = range.max_ip
+		= ct->master->tuplehash[!exp->dir].tuple.dst.ip;
+	/* hook doesn't matter, but it has to do source manip */
+	ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
+
+	/* For DST manip, map port here to where it's expected. */
+	range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
+	range.min = range.max = exp->saved_proto;
+	range.min_ip = range.max_ip
+		= ct->master->tuplehash[!exp->dir].tuple.src.ip;
+	/* hook doesn't matter, but it has to do destination manip */
+	ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
+}
diff --git a/net/ipv4/netfilter/ip_nat_irc.c b/net/ipv4/netfilter/ip_nat_irc.c
new file mode 100644
index 000000000000..9c1ca3381d56
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_irc.c
@@ -0,0 +1,125 @@
+/* IRC extension for TCP NAT alteration.
+ * (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2004 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
+ * based on a copy of RR's ip_nat_ftp.c
+ *
+ * ip_nat_irc.c,v 1.16 2001/12/06 07:42:10 laforge Exp
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/kernel.h>
+#include <net/tcp.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_conntrack_irc.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/moduleparam.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("IRC (DCC) NAT helper");
+MODULE_LICENSE("GPL");
+
+static unsigned int help(struct sk_buff **pskb,
+			 enum ip_conntrack_info ctinfo,
+			 unsigned int matchoff,
+			 unsigned int matchlen,
+			 struct ip_conntrack_expect *exp)
+{
+	u_int16_t port;
+	unsigned int ret;
+
+	/* "4294967296 65635 " */
+	char buffer[18];
+
+	DEBUGP("IRC_NAT: info (seq %u + %u) in %u\n",
+	       expect->seq, exp_irc_info->len,
+	       ntohl(tcph->seq));
+
+	/* Reply comes from server. */
+	exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+	exp->dir = IP_CT_DIR_REPLY;
+
+	/* When you see the packet, we need to NAT it the same as the
+	 * this one. */
+	exp->expectfn = ip_nat_follow_master;
+
+	/* Try to get same port: if not, try to change it. */
+	for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
+		exp->tuple.dst.u.tcp.port = htons(port);
+		if (ip_conntrack_expect_related(exp) == 0)
+			break;
+	}
+
+	if (port == 0) {
+		ip_conntrack_expect_free(exp);
+		return NF_DROP;
+	}
+
+	/*      strlen("\1DCC CHAT chat AAAAAAAA P\1\n")=27
+	 *      strlen("\1DCC SCHAT chat AAAAAAAA P\1\n")=28
+	 *      strlen("\1DCC SEND F AAAAAAAA P S\1\n")=26
+	 *      strlen("\1DCC MOVE F AAAAAAAA P S\1\n")=26
+	 *      strlen("\1DCC TSEND F AAAAAAAA P S\1\n")=27
+	 *              AAAAAAAAA: bound addr (1.0.0.0==16777216, min 8 digits,
+	 *                      255.255.255.255==4294967296, 10 digits)
+	 *              P:         bound port (min 1 d, max 5d (65635))
+	 *              F:         filename   (min 1 d )
+	 *              S:         size       (min 1 d )
+	 *              0x01, \n:  terminators
+	 */
+
+	/* AAA = "us", ie. where server normally talks to. */
+	sprintf(buffer, "%u %u",
+		ntohl(exp->master->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip),
+		port);
+	DEBUGP("ip_nat_irc: Inserting '%s' == %u.%u.%u.%u, port %u\n",
+	       buffer, NIPQUAD(exp->tuple.src.ip), port);
+
+	ret = ip_nat_mangle_tcp_packet(pskb, exp->master, ctinfo, 
+				       matchoff, matchlen, buffer, 
+				       strlen(buffer));
+	if (ret != NF_ACCEPT)
+		ip_conntrack_unexpect_related(exp);
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	ip_nat_irc_hook = NULL;
+	/* Make sure noone calls it, meanwhile. */
+	synchronize_net();
+}
+
+static int __init init(void)
+{
+	BUG_ON(ip_nat_irc_hook);
+	ip_nat_irc_hook = help;
+	return 0;
+}
+
+/* Prior to 2.6.11, we had a ports param.  No longer, but don't break users. */
+static int warn_set(const char *val, struct kernel_param *kp)
+{
+	printk(KERN_INFO __stringify(KBUILD_MODNAME)
+	       ": kernel >= 2.6.10 only uses 'ports' for conntrack modules\n");
+	return 0;
+}
+module_param_call(ports, warn_set, NULL, NULL, 0);
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_nat_proto_icmp.c b/net/ipv4/netfilter/ip_nat_proto_icmp.c
new file mode 100644
index 000000000000..a558cf0eee8a
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_proto_icmp.c
@@ -0,0 +1,115 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <linux/icmp.h>
+#include <linux/if.h>
+
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_core.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+
+static int
+icmp_in_range(const struct ip_conntrack_tuple *tuple,
+	      enum ip_nat_manip_type maniptype,
+	      const union ip_conntrack_manip_proto *min,
+	      const union ip_conntrack_manip_proto *max)
+{
+	return (tuple->src.u.icmp.id >= min->icmp.id
+		&& tuple->src.u.icmp.id <= max->icmp.id);
+}
+
+static int
+icmp_unique_tuple(struct ip_conntrack_tuple *tuple,
+		  const struct ip_nat_range *range,
+		  enum ip_nat_manip_type maniptype,
+		  const struct ip_conntrack *conntrack)
+{
+	static u_int16_t id;
+	unsigned int range_size
+		= (unsigned int)range->max.icmp.id - range->min.icmp.id + 1;
+	unsigned int i;
+
+	/* If no range specified... */
+	if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED))
+		range_size = 0xFFFF;
+
+	for (i = 0; i < range_size; i++, id++) {
+		tuple->src.u.icmp.id = range->min.icmp.id + (id % range_size);
+		if (!ip_nat_used_tuple(tuple, conntrack))
+			return 1;
+	}
+	return 0;
+}
+
+static int
+icmp_manip_pkt(struct sk_buff **pskb,
+	       unsigned int iphdroff,
+	       const struct ip_conntrack_tuple *tuple,
+	       enum ip_nat_manip_type maniptype)
+{
+	struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
+	struct icmphdr *hdr;
+	unsigned int hdroff = iphdroff + iph->ihl*4;
+
+	if (!skb_ip_make_writable(pskb, hdroff + sizeof(*hdr)))
+		return 0;
+
+	hdr = (struct icmphdr *)((*pskb)->data + hdroff);
+
+	hdr->checksum = ip_nat_cheat_check(hdr->un.echo.id ^ 0xFFFF,
+					    tuple->src.u.icmp.id,
+					    hdr->checksum);
+	hdr->un.echo.id = tuple->src.u.icmp.id;
+	return 1;
+}
+
+static unsigned int
+icmp_print(char *buffer,
+	   const struct ip_conntrack_tuple *match,
+	   const struct ip_conntrack_tuple *mask)
+{
+	unsigned int len = 0;
+
+	if (mask->src.u.icmp.id)
+		len += sprintf(buffer + len, "id=%u ",
+			       ntohs(match->src.u.icmp.id));
+
+	if (mask->dst.u.icmp.type)
+		len += sprintf(buffer + len, "type=%u ",
+			       ntohs(match->dst.u.icmp.type));
+
+	if (mask->dst.u.icmp.code)
+		len += sprintf(buffer + len, "code=%u ",
+			       ntohs(match->dst.u.icmp.code));
+
+	return len;
+}
+
+static unsigned int
+icmp_print_range(char *buffer, const struct ip_nat_range *range)
+{
+	if (range->min.icmp.id != 0 || range->max.icmp.id != 0xFFFF)
+		return sprintf(buffer, "id %u-%u ",
+			       ntohs(range->min.icmp.id),
+			       ntohs(range->max.icmp.id));
+	else return 0;
+}
+
+struct ip_nat_protocol ip_nat_protocol_icmp
+= { "ICMP", IPPROTO_ICMP,
+    icmp_manip_pkt,
+    icmp_in_range,
+    icmp_unique_tuple,
+    icmp_print,
+    icmp_print_range
+};
diff --git a/net/ipv4/netfilter/ip_nat_proto_tcp.c b/net/ipv4/netfilter/ip_nat_proto_tcp.c
new file mode 100644
index 000000000000..a91cfceff272
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_proto_tcp.c
@@ -0,0 +1,178 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/if.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+#include <linux/netfilter_ipv4/ip_nat_core.h>
+
+static int
+tcp_in_range(const struct ip_conntrack_tuple *tuple,
+	     enum ip_nat_manip_type maniptype,
+	     const union ip_conntrack_manip_proto *min,
+	     const union ip_conntrack_manip_proto *max)
+{
+	u_int16_t port;
+
+	if (maniptype == IP_NAT_MANIP_SRC)
+		port = tuple->src.u.tcp.port;
+	else
+		port = tuple->dst.u.tcp.port;
+
+	return ntohs(port) >= ntohs(min->tcp.port)
+		&& ntohs(port) <= ntohs(max->tcp.port);
+}
+
+static int
+tcp_unique_tuple(struct ip_conntrack_tuple *tuple,
+		 const struct ip_nat_range *range,
+		 enum ip_nat_manip_type maniptype,
+		 const struct ip_conntrack *conntrack)
+{
+	static u_int16_t port, *portptr;
+	unsigned int range_size, min, i;
+
+	if (maniptype == IP_NAT_MANIP_SRC)
+		portptr = &tuple->src.u.tcp.port;
+	else
+		portptr = &tuple->dst.u.tcp.port;
+
+	/* If no range specified... */
+	if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
+		/* If it's dst rewrite, can't change port */
+		if (maniptype == IP_NAT_MANIP_DST)
+			return 0;
+
+		/* Map privileged onto privileged. */
+		if (ntohs(*portptr) < 1024) {
+			/* Loose convention: >> 512 is credential passing */
+			if (ntohs(*portptr)<512) {
+				min = 1;
+				range_size = 511 - min + 1;
+			} else {
+				min = 600;
+				range_size = 1023 - min + 1;
+			}
+		} else {
+			min = 1024;
+			range_size = 65535 - 1024 + 1;
+		}
+	} else {
+		min = ntohs(range->min.tcp.port);
+		range_size = ntohs(range->max.tcp.port) - min + 1;
+	}
+
+	for (i = 0; i < range_size; i++, port++) {
+		*portptr = htons(min + port % range_size);
+		if (!ip_nat_used_tuple(tuple, conntrack)) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static int
+tcp_manip_pkt(struct sk_buff **pskb,
+	      unsigned int iphdroff,
+	      const struct ip_conntrack_tuple *tuple,
+	      enum ip_nat_manip_type maniptype)
+{
+	struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
+	struct tcphdr *hdr;
+	unsigned int hdroff = iphdroff + iph->ihl*4;
+	u32 oldip, newip;
+	u16 *portptr, newport, oldport;
+	int hdrsize = 8; /* TCP connection tracking guarantees this much */
+
+	/* this could be a inner header returned in icmp packet; in such
+	   cases we cannot update the checksum field since it is outside of
+	   the 8 bytes of transport layer headers we are guaranteed */
+	if ((*pskb)->len >= hdroff + sizeof(struct tcphdr))
+		hdrsize = sizeof(struct tcphdr);
+
+	if (!skb_ip_make_writable(pskb, hdroff + hdrsize))
+		return 0;
+
+	iph = (struct iphdr *)((*pskb)->data + iphdroff);
+	hdr = (struct tcphdr *)((*pskb)->data + hdroff);
+
+	if (maniptype == IP_NAT_MANIP_SRC) {
+		/* Get rid of src ip and src pt */
+		oldip = iph->saddr;
+		newip = tuple->src.ip;
+		newport = tuple->src.u.tcp.port;
+		portptr = &hdr->source;
+	} else {
+		/* Get rid of dst ip and dst pt */
+		oldip = iph->daddr;
+		newip = tuple->dst.ip;
+		newport = tuple->dst.u.tcp.port;
+		portptr = &hdr->dest;
+	}
+
+	oldport = *portptr;
+	*portptr = newport;
+
+	if (hdrsize < sizeof(*hdr))
+		return 1;
+
+	hdr->check = ip_nat_cheat_check(~oldip, newip,
+					ip_nat_cheat_check(oldport ^ 0xFFFF,
+							   newport,
+							   hdr->check));
+	return 1;
+}
+
+static unsigned int
+tcp_print(char *buffer,
+	  const struct ip_conntrack_tuple *match,
+	  const struct ip_conntrack_tuple *mask)
+{
+	unsigned int len = 0;
+
+	if (mask->src.u.tcp.port)
+		len += sprintf(buffer + len, "srcpt=%u ",
+			       ntohs(match->src.u.tcp.port));
+
+
+	if (mask->dst.u.tcp.port)
+		len += sprintf(buffer + len, "dstpt=%u ",
+			       ntohs(match->dst.u.tcp.port));
+
+	return len;
+}
+
+static unsigned int
+tcp_print_range(char *buffer, const struct ip_nat_range *range)
+{
+	if (range->min.tcp.port != 0 || range->max.tcp.port != 0xFFFF) {
+		if (range->min.tcp.port == range->max.tcp.port)
+			return sprintf(buffer, "port %u ",
+				       ntohs(range->min.tcp.port));
+		else
+			return sprintf(buffer, "ports %u-%u ",
+				       ntohs(range->min.tcp.port),
+				       ntohs(range->max.tcp.port));
+	}
+	else return 0;
+}
+
+struct ip_nat_protocol ip_nat_protocol_tcp
+= { "TCP", IPPROTO_TCP,
+    tcp_manip_pkt,
+    tcp_in_range,
+    tcp_unique_tuple,
+    tcp_print,
+    tcp_print_range
+};
diff --git a/net/ipv4/netfilter/ip_nat_proto_udp.c b/net/ipv4/netfilter/ip_nat_proto_udp.c
new file mode 100644
index 000000000000..c669e3b5f5d0
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_proto_udp.c
@@ -0,0 +1,165 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/if.h>
+
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_core.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+
+static int
+udp_in_range(const struct ip_conntrack_tuple *tuple,
+	     enum ip_nat_manip_type maniptype,
+	     const union ip_conntrack_manip_proto *min,
+	     const union ip_conntrack_manip_proto *max)
+{
+	u_int16_t port;
+
+	if (maniptype == IP_NAT_MANIP_SRC)
+		port = tuple->src.u.udp.port;
+	else
+		port = tuple->dst.u.udp.port;
+
+	return ntohs(port) >= ntohs(min->udp.port)
+		&& ntohs(port) <= ntohs(max->udp.port);
+}
+
+static int
+udp_unique_tuple(struct ip_conntrack_tuple *tuple,
+		 const struct ip_nat_range *range,
+		 enum ip_nat_manip_type maniptype,
+		 const struct ip_conntrack *conntrack)
+{
+	static u_int16_t port, *portptr;
+	unsigned int range_size, min, i;
+
+	if (maniptype == IP_NAT_MANIP_SRC)
+		portptr = &tuple->src.u.udp.port;
+	else
+		portptr = &tuple->dst.u.udp.port;
+
+	/* If no range specified... */
+	if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
+		/* If it's dst rewrite, can't change port */
+		if (maniptype == IP_NAT_MANIP_DST)
+			return 0;
+
+		if (ntohs(*portptr) < 1024) {
+			/* Loose convention: >> 512 is credential passing */
+			if (ntohs(*portptr)<512) {
+				min = 1;
+				range_size = 511 - min + 1;
+			} else {
+				min = 600;
+				range_size = 1023 - min + 1;
+			}
+		} else {
+			min = 1024;
+			range_size = 65535 - 1024 + 1;
+		}
+	} else {
+		min = ntohs(range->min.udp.port);
+		range_size = ntohs(range->max.udp.port) - min + 1;
+	}
+
+	for (i = 0; i < range_size; i++, port++) {
+		*portptr = htons(min + port % range_size);
+		if (!ip_nat_used_tuple(tuple, conntrack))
+			return 1;
+	}
+	return 0;
+}
+
+static int
+udp_manip_pkt(struct sk_buff **pskb,
+	      unsigned int iphdroff,
+	      const struct ip_conntrack_tuple *tuple,
+	      enum ip_nat_manip_type maniptype)
+{
+	struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
+	struct udphdr *hdr;
+	unsigned int hdroff = iphdroff + iph->ihl*4;
+	u32 oldip, newip;
+	u16 *portptr, newport;
+
+	if (!skb_ip_make_writable(pskb, hdroff + sizeof(*hdr)))
+		return 0;
+
+	iph = (struct iphdr *)((*pskb)->data + iphdroff);
+	hdr = (struct udphdr *)((*pskb)->data + hdroff);
+
+	if (maniptype == IP_NAT_MANIP_SRC) {
+		/* Get rid of src ip and src pt */
+		oldip = iph->saddr;
+		newip = tuple->src.ip;
+		newport = tuple->src.u.udp.port;
+		portptr = &hdr->source;
+	} else {
+		/* Get rid of dst ip and dst pt */
+		oldip = iph->daddr;
+		newip = tuple->dst.ip;
+		newport = tuple->dst.u.udp.port;
+		portptr = &hdr->dest;
+	}
+	if (hdr->check) /* 0 is a special case meaning no checksum */
+		hdr->check = ip_nat_cheat_check(~oldip, newip,
+					ip_nat_cheat_check(*portptr ^ 0xFFFF,
+							   newport,
+							   hdr->check));
+	*portptr = newport;
+	return 1;
+}
+
+static unsigned int
+udp_print(char *buffer,
+	  const struct ip_conntrack_tuple *match,
+	  const struct ip_conntrack_tuple *mask)
+{
+	unsigned int len = 0;
+
+	if (mask->src.u.udp.port)
+		len += sprintf(buffer + len, "srcpt=%u ",
+			       ntohs(match->src.u.udp.port));
+
+
+	if (mask->dst.u.udp.port)
+		len += sprintf(buffer + len, "dstpt=%u ",
+			       ntohs(match->dst.u.udp.port));
+
+	return len;
+}
+
+static unsigned int
+udp_print_range(char *buffer, const struct ip_nat_range *range)
+{
+	if (range->min.udp.port != 0 || range->max.udp.port != 0xFFFF) {
+		if (range->min.udp.port == range->max.udp.port)
+			return sprintf(buffer, "port %u ",
+				       ntohs(range->min.udp.port));
+		else
+			return sprintf(buffer, "ports %u-%u ",
+				       ntohs(range->min.udp.port),
+				       ntohs(range->max.udp.port));
+	}
+	else return 0;
+}
+
+struct ip_nat_protocol ip_nat_protocol_udp
+= { "UDP", IPPROTO_UDP,
+    udp_manip_pkt,
+    udp_in_range,
+    udp_unique_tuple,
+    udp_print,
+    udp_print_range
+};
diff --git a/net/ipv4/netfilter/ip_nat_proto_unknown.c b/net/ipv4/netfilter/ip_nat_proto_unknown.c
new file mode 100644
index 000000000000..f5525bd58d16
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_proto_unknown.c
@@ -0,0 +1,70 @@
+/* The "unknown" protocol.  This is what is used for protocols we
+ * don't understand.  It's returned by ip_ct_find_proto().
+ */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/netfilter.h>
+#include <linux/if.h>
+
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+
+static int unknown_in_range(const struct ip_conntrack_tuple *tuple,
+			    enum ip_nat_manip_type manip_type,
+			    const union ip_conntrack_manip_proto *min,
+			    const union ip_conntrack_manip_proto *max)
+{
+	return 1;
+}
+
+static int unknown_unique_tuple(struct ip_conntrack_tuple *tuple,
+				const struct ip_nat_range *range,
+				enum ip_nat_manip_type maniptype,
+				const struct ip_conntrack *conntrack)
+{
+	/* Sorry: we can't help you; if it's not unique, we can't frob
+	   anything. */
+	return 0;
+}
+
+static int
+unknown_manip_pkt(struct sk_buff **pskb,
+		  unsigned int iphdroff,
+		  const struct ip_conntrack_tuple *tuple,
+		  enum ip_nat_manip_type maniptype)
+{
+	return 1;
+}
+
+static unsigned int
+unknown_print(char *buffer,
+	      const struct ip_conntrack_tuple *match,
+	      const struct ip_conntrack_tuple *mask)
+{
+	return 0;
+}
+
+static unsigned int
+unknown_print_range(char *buffer, const struct ip_nat_range *range)
+{
+	return 0;
+}
+
+struct ip_nat_protocol ip_nat_unknown_protocol = {
+	"unknown", 0,
+	unknown_manip_pkt,
+	unknown_in_range,
+	unknown_unique_tuple,
+	unknown_print,
+	unknown_print_range
+};
diff --git a/net/ipv4/netfilter/ip_nat_rule.c b/net/ipv4/netfilter/ip_nat_rule.c
new file mode 100644
index 000000000000..581f097f5a24
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_rule.c
@@ -0,0 +1,319 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* Everything about the rules for NAT. */
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <net/checksum.h>
+#include <net/route.h>
+#include <linux/bitops.h>
+
+#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_nat_lock)
+#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_nat_lock)
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_core.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#define NAT_VALID_HOOKS ((1<<NF_IP_PRE_ROUTING) | (1<<NF_IP_POST_ROUTING) | (1<<NF_IP_LOCAL_OUT))
+
+static struct
+{
+	struct ipt_replace repl;
+	struct ipt_standard entries[3];
+	struct ipt_error term;
+} nat_initial_table __initdata
+= { { "nat", NAT_VALID_HOOKS, 4,
+      sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
+      { [NF_IP_PRE_ROUTING] = 0,
+	[NF_IP_POST_ROUTING] = sizeof(struct ipt_standard),
+	[NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
+      { [NF_IP_PRE_ROUTING] = 0,
+	[NF_IP_POST_ROUTING] = sizeof(struct ipt_standard),
+	[NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
+      0, NULL, { } },
+    {
+	    /* PRE_ROUTING */
+	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } },
+	    /* POST_ROUTING */
+	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } },
+	    /* LOCAL_OUT */
+	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } }
+    },
+    /* ERROR */
+    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+	0,
+	sizeof(struct ipt_entry),
+	sizeof(struct ipt_error),
+	0, { 0, 0 }, { } },
+      { { { { IPT_ALIGN(sizeof(struct ipt_error_target)), IPT_ERROR_TARGET } },
+	  { } },
+	"ERROR"
+      }
+    }
+};
+
+static struct ipt_table nat_table = {
+	.name		= "nat",
+	.valid_hooks	= NAT_VALID_HOOKS,
+	.lock		= RW_LOCK_UNLOCKED,
+	.me		= THIS_MODULE,
+};
+
+/* Source NAT */
+static unsigned int ipt_snat_target(struct sk_buff **pskb,
+				    const struct net_device *in,
+				    const struct net_device *out,
+				    unsigned int hooknum,
+				    const void *targinfo,
+				    void *userinfo)
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	const struct ip_nat_multi_range_compat *mr = targinfo;
+
+	IP_NF_ASSERT(hooknum == NF_IP_POST_ROUTING);
+
+	ct = ip_conntrack_get(*pskb, &ctinfo);
+
+	/* Connection must be valid and new. */
+	IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
+	                    || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
+	IP_NF_ASSERT(out);
+
+	return ip_nat_setup_info(ct, &mr->range[0], hooknum);
+}
+
+/* Before 2.6.11 we did implicit source NAT if required. Warn about change. */
+static void warn_if_extra_mangle(u32 dstip, u32 srcip)
+{
+	static int warned = 0;
+	struct flowi fl = { .nl_u = { .ip4_u = { .daddr = dstip } } };
+	struct rtable *rt;
+
+	if (ip_route_output_key(&rt, &fl) != 0)
+		return;
+
+	if (rt->rt_src != srcip && !warned) {
+		printk("NAT: no longer support implicit source local NAT\n");
+		printk("NAT: packet src %u.%u.%u.%u -> dst %u.%u.%u.%u\n",
+		       NIPQUAD(srcip), NIPQUAD(dstip));
+		warned = 1;
+	}
+	ip_rt_put(rt);
+}
+
+static unsigned int ipt_dnat_target(struct sk_buff **pskb,
+				    const struct net_device *in,
+				    const struct net_device *out,
+				    unsigned int hooknum,
+				    const void *targinfo,
+				    void *userinfo)
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	const struct ip_nat_multi_range_compat *mr = targinfo;
+
+	IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
+		     || hooknum == NF_IP_LOCAL_OUT);
+
+	ct = ip_conntrack_get(*pskb, &ctinfo);
+
+	/* Connection must be valid and new. */
+	IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
+
+	if (hooknum == NF_IP_LOCAL_OUT
+	    && mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)
+		warn_if_extra_mangle((*pskb)->nh.iph->daddr,
+				     mr->range[0].min_ip);
+
+	return ip_nat_setup_info(ct, &mr->range[0], hooknum);
+}
+
+static int ipt_snat_checkentry(const char *tablename,
+			       const struct ipt_entry *e,
+			       void *targinfo,
+			       unsigned int targinfosize,
+			       unsigned int hook_mask)
+{
+	struct ip_nat_multi_range_compat *mr = targinfo;
+
+	/* Must be a valid range */
+	if (mr->rangesize != 1) {
+		printk("SNAT: multiple ranges no longer supported\n");
+		return 0;
+	}
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ip_nat_multi_range_compat))) {
+		DEBUGP("SNAT: Target size %u wrong for %u ranges\n",
+		       targinfosize, mr->rangesize);
+		return 0;
+	}
+
+	/* Only allow these for NAT. */
+	if (strcmp(tablename, "nat") != 0) {
+		DEBUGP("SNAT: wrong table %s\n", tablename);
+		return 0;
+	}
+
+	if (hook_mask & ~(1 << NF_IP_POST_ROUTING)) {
+		DEBUGP("SNAT: hook mask 0x%x bad\n", hook_mask);
+		return 0;
+	}
+	return 1;
+}
+
+static int ipt_dnat_checkentry(const char *tablename,
+			       const struct ipt_entry *e,
+			       void *targinfo,
+			       unsigned int targinfosize,
+			       unsigned int hook_mask)
+{
+	struct ip_nat_multi_range_compat *mr = targinfo;
+
+	/* Must be a valid range */
+	if (mr->rangesize != 1) {
+		printk("DNAT: multiple ranges no longer supported\n");
+		return 0;
+	}
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ip_nat_multi_range_compat))) {
+		DEBUGP("DNAT: Target size %u wrong for %u ranges\n",
+		       targinfosize, mr->rangesize);
+		return 0;
+	}
+
+	/* Only allow these for NAT. */
+	if (strcmp(tablename, "nat") != 0) {
+		DEBUGP("DNAT: wrong table %s\n", tablename);
+		return 0;
+	}
+
+	if (hook_mask & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT))) {
+		DEBUGP("DNAT: hook mask 0x%x bad\n", hook_mask);
+		return 0;
+	}
+	
+	return 1;
+}
+
+inline unsigned int
+alloc_null_binding(struct ip_conntrack *conntrack,
+		   struct ip_nat_info *info,
+		   unsigned int hooknum)
+{
+	/* Force range to this IP; let proto decide mapping for
+	   per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED).
+	   Use reply in case it's already been mangled (eg local packet).
+	*/
+	u_int32_t ip
+		= (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
+		   ? conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip
+		   : conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip);
+	struct ip_nat_range range
+		= { IP_NAT_RANGE_MAP_IPS, ip, ip, { 0 }, { 0 } };
+
+	DEBUGP("Allocating NULL binding for %p (%u.%u.%u.%u)\n", conntrack,
+	       NIPQUAD(ip));
+	return ip_nat_setup_info(conntrack, &range, hooknum);
+}
+
+int ip_nat_rule_find(struct sk_buff **pskb,
+		     unsigned int hooknum,
+		     const struct net_device *in,
+		     const struct net_device *out,
+		     struct ip_conntrack *ct,
+		     struct ip_nat_info *info)
+{
+	int ret;
+
+	ret = ipt_do_table(pskb, hooknum, in, out, &nat_table, NULL);
+
+	if (ret == NF_ACCEPT) {
+		if (!ip_nat_initialized(ct, HOOK2MANIP(hooknum)))
+			/* NUL mapping */
+			ret = alloc_null_binding(ct, info, hooknum);
+	}
+	return ret;
+}
+
+static struct ipt_target ipt_snat_reg = {
+	.name		= "SNAT",
+	.target		= ipt_snat_target,
+	.checkentry	= ipt_snat_checkentry,
+};
+
+static struct ipt_target ipt_dnat_reg = {
+	.name		= "DNAT",
+	.target		= ipt_dnat_target,
+	.checkentry	= ipt_dnat_checkentry,
+};
+
+int __init ip_nat_rule_init(void)
+{
+	int ret;
+
+	ret = ipt_register_table(&nat_table, &nat_initial_table.repl);
+	if (ret != 0)
+		return ret;
+	ret = ipt_register_target(&ipt_snat_reg);
+	if (ret != 0)
+		goto unregister_table;
+
+	ret = ipt_register_target(&ipt_dnat_reg);
+	if (ret != 0)
+		goto unregister_snat;
+
+	return ret;
+
+ unregister_snat:
+	ipt_unregister_target(&ipt_snat_reg);
+ unregister_table:
+	ipt_unregister_table(&nat_table);
+
+	return ret;
+}
+
+void ip_nat_rule_cleanup(void)
+{
+	ipt_unregister_target(&ipt_dnat_reg);
+	ipt_unregister_target(&ipt_snat_reg);
+	ipt_unregister_table(&nat_table);
+}
diff --git a/net/ipv4/netfilter/ip_nat_snmp_basic.c b/net/ipv4/netfilter/ip_nat_snmp_basic.c
new file mode 100644
index 000000000000..2a48b6e635ae
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_snmp_basic.c
@@ -0,0 +1,1347 @@
+/*
+ * ip_nat_snmp_basic.c
+ *
+ * Basic SNMP Application Layer Gateway
+ *
+ * This IP NAT module is intended for use with SNMP network 
+ * discovery and monitoring applications where target networks use 
+ * conflicting private address realms.
+ *
+ * Static NAT is used to remap the networks from the view of the network 
+ * management system at the IP layer, and this module remaps some application
+ * layer addresses to match.
+ *
+ * The simplest form of ALG is performed, where only tagged IP addresses
+ * are modified.  The module does not need to be MIB aware and only scans
+ * messages at the ASN.1/BER level.
+ *
+ * Currently, only SNMPv1 and SNMPv2 are supported.
+ *
+ * More information on ALG and associated issues can be found in
+ * RFC 2962
+ *
+ * The ASB.1/BER parsing code is derived from the gxsnmp package by Gregory 
+ * McLean & Jochen Friedrich, stripped down for use in the kernel.
+ *
+ * Copyright (c) 2000 RP Internet (www.rpi.net.au).
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ * Author: James Morris <jmorris@intercode.com.au>
+ *
+ * Updates:
+ * 2000-08-06: Convert to new helper API (Harald Welte).
+ *
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/moduleparam.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+#include <net/udp.h>
+#include <asm/uaccess.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
+MODULE_DESCRIPTION("Basic SNMP Application Layer Gateway");
+
+#define SNMP_PORT 161
+#define SNMP_TRAP_PORT 162
+#define NOCT1(n) (u_int8_t )((n) & 0xff)
+
+static int debug;
+static DEFINE_SPINLOCK(snmp_lock);
+
+/* 
+ * Application layer address mapping mimics the NAT mapping, but 
+ * only for the first octet in this case (a more flexible system
+ * can be implemented if needed).
+ */
+struct oct1_map
+{
+	u_int8_t from;
+	u_int8_t to;
+};
+
+                                  
+/*****************************************************************************
+ *
+ * Basic ASN.1 decoding routines (gxsnmp author Dirk Wisse)
+ *
+ *****************************************************************************/
+
+/* Class */
+#define ASN1_UNI	0	/* Universal */
+#define ASN1_APL	1	/* Application */
+#define ASN1_CTX	2	/* Context */
+#define ASN1_PRV	3	/* Private */
+
+/* Tag */
+#define ASN1_EOC	0	/* End Of Contents */
+#define ASN1_BOL	1	/* Boolean */
+#define ASN1_INT	2	/* Integer */
+#define ASN1_BTS	3	/* Bit String */
+#define ASN1_OTS	4	/* Octet String */
+#define ASN1_NUL	5	/* Null */
+#define ASN1_OJI	6	/* Object Identifier  */
+#define ASN1_OJD	7	/* Object Description */
+#define ASN1_EXT	8	/* External */
+#define ASN1_SEQ	16	/* Sequence */
+#define ASN1_SET	17	/* Set */
+#define ASN1_NUMSTR	18	/* Numerical String */
+#define ASN1_PRNSTR	19	/* Printable String */
+#define ASN1_TEXSTR	20	/* Teletext String */
+#define ASN1_VIDSTR	21	/* Video String */
+#define ASN1_IA5STR	22	/* IA5 String */
+#define ASN1_UNITIM	23	/* Universal Time */
+#define ASN1_GENTIM	24	/* General Time */
+#define ASN1_GRASTR	25	/* Graphical String */
+#define ASN1_VISSTR	26	/* Visible String */
+#define ASN1_GENSTR	27	/* General String */
+
+/* Primitive / Constructed methods*/
+#define ASN1_PRI	0	/* Primitive */
+#define ASN1_CON	1	/* Constructed */
+
+/*
+ * Error codes.
+ */
+#define ASN1_ERR_NOERROR		0
+#define ASN1_ERR_DEC_EMPTY		2
+#define ASN1_ERR_DEC_EOC_MISMATCH	3
+#define ASN1_ERR_DEC_LENGTH_MISMATCH	4
+#define ASN1_ERR_DEC_BADVALUE		5
+
+/* 
+ * ASN.1 context.
+ */
+struct asn1_ctx
+{
+	int error;			/* Error condition */
+	unsigned char *pointer;		/* Octet just to be decoded */
+	unsigned char *begin;		/* First octet */
+	unsigned char *end;		/* Octet after last octet */
+};
+
+/*
+ * Octet string (not null terminated)
+ */
+struct asn1_octstr
+{
+	unsigned char *data;
+	unsigned int len;
+};
+	
+static void asn1_open(struct asn1_ctx *ctx,
+                      unsigned char *buf,
+                      unsigned int len)
+{
+	ctx->begin = buf;
+	ctx->end = buf + len;
+	ctx->pointer = buf;
+	ctx->error = ASN1_ERR_NOERROR;
+}
+
+static unsigned char asn1_octet_decode(struct asn1_ctx *ctx, unsigned char *ch)
+{
+	if (ctx->pointer >= ctx->end) {
+		ctx->error = ASN1_ERR_DEC_EMPTY;
+		return 0;
+	}
+	*ch = *(ctx->pointer)++;
+	return 1;
+}
+
+static unsigned char asn1_tag_decode(struct asn1_ctx *ctx, unsigned int *tag)
+{
+	unsigned char ch;
+	
+	*tag = 0;
+	
+	do
+	{
+		if (!asn1_octet_decode(ctx, &ch))
+			return 0;
+		*tag <<= 7;
+		*tag |= ch & 0x7F;
+	} while ((ch & 0x80) == 0x80);
+	return 1;
+}
+
+static unsigned char asn1_id_decode(struct asn1_ctx *ctx, 
+                                    unsigned int *cls,
+                                    unsigned int *con,
+                                    unsigned int *tag)
+{
+	unsigned char ch;
+	
+	if (!asn1_octet_decode(ctx, &ch))
+		return 0;
+		
+	*cls = (ch & 0xC0) >> 6;
+	*con = (ch & 0x20) >> 5;
+	*tag = (ch & 0x1F);
+	
+	if (*tag == 0x1F) {
+		if (!asn1_tag_decode(ctx, tag))
+			return 0;
+	}
+	return 1;
+}
+
+static unsigned char asn1_length_decode(struct asn1_ctx *ctx,
+                                        unsigned int *def,
+                                        unsigned int *len)
+{
+	unsigned char ch, cnt;
+	
+	if (!asn1_octet_decode(ctx, &ch))
+		return 0;
+		
+	if (ch == 0x80)
+		*def = 0;
+	else {
+		*def = 1;
+		
+		if (ch < 0x80)
+			*len = ch;
+		else {
+			cnt = (unsigned char) (ch & 0x7F);
+			*len = 0;
+			
+			while (cnt > 0) {
+				if (!asn1_octet_decode(ctx, &ch))
+					return 0;
+				*len <<= 8;
+				*len |= ch;
+				cnt--;
+			}
+		}
+	}
+	return 1;
+}
+
+static unsigned char asn1_header_decode(struct asn1_ctx *ctx,
+                                        unsigned char **eoc,
+                                        unsigned int *cls,
+                                        unsigned int *con,
+                                        unsigned int *tag)
+{
+	unsigned int def, len;
+	
+	if (!asn1_id_decode(ctx, cls, con, tag))
+		return 0;
+		
+	if (!asn1_length_decode(ctx, &def, &len))
+		return 0;
+		
+	if (def)
+		*eoc = ctx->pointer + len;
+	else
+		*eoc = NULL;
+	return 1;
+}
+
+static unsigned char asn1_eoc_decode(struct asn1_ctx *ctx, unsigned char *eoc)
+{
+	unsigned char ch;
+	
+	if (eoc == 0) {
+		if (!asn1_octet_decode(ctx, &ch))
+			return 0;
+			
+		if (ch != 0x00) {
+			ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
+			return 0;
+		}
+		
+		if (!asn1_octet_decode(ctx, &ch))
+			return 0;
+			
+		if (ch != 0x00) {
+			ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
+			return 0;
+		}
+		return 1;
+	} else {
+		if (ctx->pointer != eoc) {
+			ctx->error = ASN1_ERR_DEC_LENGTH_MISMATCH;
+			return 0;
+		}
+		return 1;
+	}
+}
+
+static unsigned char asn1_null_decode(struct asn1_ctx *ctx, unsigned char *eoc)
+{
+	ctx->pointer = eoc;
+	return 1;
+}
+
+static unsigned char asn1_long_decode(struct asn1_ctx *ctx,
+                                      unsigned char *eoc,
+                                      long *integer)
+{
+	unsigned char ch;
+	unsigned int  len;
+	
+	if (!asn1_octet_decode(ctx, &ch))
+		return 0;
+		
+	*integer = (signed char) ch;
+	len = 1;
+	
+	while (ctx->pointer < eoc) {
+		if (++len > sizeof (long)) {
+			ctx->error = ASN1_ERR_DEC_BADVALUE;
+			return 0;
+		}
+		
+		if (!asn1_octet_decode(ctx, &ch))
+			return 0;
+			
+		*integer <<= 8;
+		*integer |= ch;
+	}
+	return 1;
+}
+
+static unsigned char asn1_uint_decode(struct asn1_ctx *ctx,
+                                      unsigned char *eoc,
+                                      unsigned int *integer)
+{
+	unsigned char ch;
+	unsigned int  len;
+	
+	if (!asn1_octet_decode(ctx, &ch))
+		return 0;
+		
+	*integer = ch;
+	if (ch == 0) len = 0;
+	else len = 1;
+	
+	while (ctx->pointer < eoc) {
+		if (++len > sizeof (unsigned int)) {
+			ctx->error = ASN1_ERR_DEC_BADVALUE;
+			return 0;
+		}
+		
+		if (!asn1_octet_decode(ctx, &ch))
+			return 0;
+			
+		*integer <<= 8;
+		*integer |= ch;
+	}
+	return 1;
+}
+
+static unsigned char asn1_ulong_decode(struct asn1_ctx *ctx,
+                                       unsigned char *eoc,
+                                       unsigned long *integer)
+{
+	unsigned char ch;
+	unsigned int  len;
+	
+	if (!asn1_octet_decode(ctx, &ch))
+		return 0;
+		
+	*integer = ch;
+	if (ch == 0) len = 0;
+	else len = 1;
+	
+	while (ctx->pointer < eoc) {
+		if (++len > sizeof (unsigned long)) {
+			ctx->error = ASN1_ERR_DEC_BADVALUE;
+			return 0;
+		}
+		
+		if (!asn1_octet_decode(ctx, &ch))
+			return 0;
+			
+		*integer <<= 8;
+		*integer |= ch;
+	}
+	return 1;
+}
+
+static unsigned char asn1_octets_decode(struct asn1_ctx *ctx,
+                                        unsigned char *eoc,
+                                        unsigned char **octets,
+                                        unsigned int *len)
+{
+	unsigned char *ptr;
+	
+	*len = 0;
+	
+	*octets = kmalloc(eoc - ctx->pointer, GFP_ATOMIC);
+	if (*octets == NULL) {
+		if (net_ratelimit())
+			printk("OOM in bsalg (%d)\n", __LINE__);
+		return 0;
+	}
+	
+	ptr = *octets;
+	while (ctx->pointer < eoc) {
+		if (!asn1_octet_decode(ctx, (unsigned char *)ptr++)) {
+			kfree(*octets);
+			*octets = NULL;
+			return 0;
+		}
+		(*len)++;
+	}
+	return 1;
+}
+
+static unsigned char asn1_subid_decode(struct asn1_ctx *ctx,
+                                       unsigned long *subid)
+{
+	unsigned char ch;
+	
+	*subid = 0;
+	
+	do {
+		if (!asn1_octet_decode(ctx, &ch))
+			return 0;
+		
+		*subid <<= 7;
+		*subid |= ch & 0x7F;
+	} while ((ch & 0x80) == 0x80);
+	return 1;
+}
+
+static unsigned char asn1_oid_decode(struct asn1_ctx *ctx,
+                                     unsigned char *eoc,
+                                     unsigned long **oid,
+                                     unsigned int *len)
+{
+	unsigned long subid;
+	unsigned int  size;
+	unsigned long *optr;
+	
+	size = eoc - ctx->pointer + 1;
+	*oid = kmalloc(size * sizeof(unsigned long), GFP_ATOMIC);
+	if (*oid == NULL) {
+		if (net_ratelimit())
+			printk("OOM in bsalg (%d)\n", __LINE__);
+		return 0;
+	}
+	
+	optr = *oid;
+	
+	if (!asn1_subid_decode(ctx, &subid)) {
+		kfree(*oid);
+		*oid = NULL;
+		return 0;
+	}
+	
+	if (subid < 40) {
+		optr [0] = 0;
+		optr [1] = subid;
+	} else if (subid < 80) {
+		optr [0] = 1;
+		optr [1] = subid - 40;
+	} else {
+		optr [0] = 2;
+		optr [1] = subid - 80;
+	}
+	
+	*len = 2;
+	optr += 2;
+	
+	while (ctx->pointer < eoc) {
+		if (++(*len) > size) {
+			ctx->error = ASN1_ERR_DEC_BADVALUE;
+			kfree(*oid);
+			*oid = NULL;
+			return 0;
+		}
+		
+		if (!asn1_subid_decode(ctx, optr++)) {
+			kfree(*oid);
+			*oid = NULL;
+			return 0;
+		}
+	}
+	return 1;
+}
+
+/*****************************************************************************
+ *
+ * SNMP decoding routines (gxsnmp author Dirk Wisse)
+ *
+ *****************************************************************************/
+
+/* SNMP Versions */
+#define SNMP_V1				0
+#define SNMP_V2C			1
+#define SNMP_V2				2
+#define SNMP_V3				3
+
+/* Default Sizes */
+#define SNMP_SIZE_COMM			256
+#define SNMP_SIZE_OBJECTID		128
+#define SNMP_SIZE_BUFCHR		256
+#define SNMP_SIZE_BUFINT		128
+#define SNMP_SIZE_SMALLOBJECTID		16
+
+/* Requests */
+#define SNMP_PDU_GET			0
+#define SNMP_PDU_NEXT			1
+#define SNMP_PDU_RESPONSE		2
+#define SNMP_PDU_SET			3
+#define SNMP_PDU_TRAP1			4
+#define SNMP_PDU_BULK			5
+#define SNMP_PDU_INFORM			6
+#define SNMP_PDU_TRAP2			7
+
+/* Errors */
+#define SNMP_NOERROR			0
+#define SNMP_TOOBIG			1
+#define SNMP_NOSUCHNAME			2
+#define SNMP_BADVALUE			3
+#define SNMP_READONLY			4
+#define SNMP_GENERROR			5
+#define SNMP_NOACCESS			6
+#define SNMP_WRONGTYPE			7
+#define SNMP_WRONGLENGTH		8
+#define SNMP_WRONGENCODING		9
+#define SNMP_WRONGVALUE			10
+#define SNMP_NOCREATION			11
+#define SNMP_INCONSISTENTVALUE		12
+#define SNMP_RESOURCEUNAVAILABLE	13
+#define SNMP_COMMITFAILED		14
+#define SNMP_UNDOFAILED			15
+#define SNMP_AUTHORIZATIONERROR		16
+#define SNMP_NOTWRITABLE		17
+#define SNMP_INCONSISTENTNAME		18
+
+/* General SNMP V1 Traps */
+#define SNMP_TRAP_COLDSTART		0
+#define SNMP_TRAP_WARMSTART		1
+#define SNMP_TRAP_LINKDOWN		2
+#define SNMP_TRAP_LINKUP		3
+#define SNMP_TRAP_AUTFAILURE		4
+#define SNMP_TRAP_EQPNEIGHBORLOSS	5
+#define SNMP_TRAP_ENTSPECIFIC		6
+
+/* SNMPv1 Types */
+#define SNMP_NULL                0
+#define SNMP_INTEGER             1    /* l  */
+#define SNMP_OCTETSTR            2    /* c  */
+#define SNMP_DISPLAYSTR          2    /* c  */
+#define SNMP_OBJECTID            3    /* ul */
+#define SNMP_IPADDR              4    /* uc */
+#define SNMP_COUNTER             5    /* ul */
+#define SNMP_GAUGE               6    /* ul */
+#define SNMP_TIMETICKS           7    /* ul */
+#define SNMP_OPAQUE              8    /* c  */
+
+/* Additional SNMPv2 Types */
+#define SNMP_UINTEGER            5    /* ul */
+#define SNMP_BITSTR              9    /* uc */
+#define SNMP_NSAP               10    /* uc */
+#define SNMP_COUNTER64          11    /* ul */
+#define SNMP_NOSUCHOBJECT       12
+#define SNMP_NOSUCHINSTANCE     13
+#define SNMP_ENDOFMIBVIEW       14
+
+union snmp_syntax
+{
+	unsigned char uc[0];	/* 8 bit unsigned */
+	char c[0];		/* 8 bit signed */
+	unsigned long ul[0];	/* 32 bit unsigned */
+	long l[0];		/* 32 bit signed */
+};
+
+struct snmp_object
+{
+	unsigned long *id;
+	unsigned int id_len;
+	unsigned short type;
+	unsigned int syntax_len;
+	union snmp_syntax syntax;
+};
+
+struct snmp_request
+{
+	unsigned long id;
+	unsigned int error_status;
+	unsigned int error_index;
+};
+
+struct snmp_v1_trap
+{
+	unsigned long *id;
+	unsigned int id_len;
+	unsigned long ip_address;	/* pointer  */
+	unsigned int general;
+	unsigned int specific;
+	unsigned long time;
+};
+
+/* SNMP types */
+#define SNMP_IPA    0
+#define SNMP_CNT    1
+#define SNMP_GGE    2
+#define SNMP_TIT    3
+#define SNMP_OPQ    4
+#define SNMP_C64    6
+
+/* SNMP errors */
+#define SERR_NSO    0
+#define SERR_NSI    1
+#define SERR_EOM    2
+
+static inline void mangle_address(unsigned char *begin,
+                                  unsigned char *addr,
+                                  const struct oct1_map *map,
+                                  u_int16_t *check);
+struct snmp_cnv
+{
+	unsigned int class;
+	unsigned int tag;
+	int syntax;
+};
+
+static struct snmp_cnv snmp_conv [] =
+{
+	{ASN1_UNI, ASN1_NUL, SNMP_NULL},
+	{ASN1_UNI, ASN1_INT, SNMP_INTEGER},
+	{ASN1_UNI, ASN1_OTS, SNMP_OCTETSTR},
+	{ASN1_UNI, ASN1_OTS, SNMP_DISPLAYSTR},
+	{ASN1_UNI, ASN1_OJI, SNMP_OBJECTID},
+	{ASN1_APL, SNMP_IPA, SNMP_IPADDR},
+	{ASN1_APL, SNMP_CNT, SNMP_COUNTER},	/* Counter32 */
+	{ASN1_APL, SNMP_GGE, SNMP_GAUGE},	/* Gauge32 == Unsigned32  */
+	{ASN1_APL, SNMP_TIT, SNMP_TIMETICKS},
+	{ASN1_APL, SNMP_OPQ, SNMP_OPAQUE},
+	
+	/* SNMPv2 data types and errors */
+	{ASN1_UNI, ASN1_BTS, SNMP_BITSTR},
+	{ASN1_APL, SNMP_C64, SNMP_COUNTER64},
+	{ASN1_CTX, SERR_NSO, SNMP_NOSUCHOBJECT},
+	{ASN1_CTX, SERR_NSI, SNMP_NOSUCHINSTANCE},
+	{ASN1_CTX, SERR_EOM, SNMP_ENDOFMIBVIEW},
+	{0,       0,       -1}
+};
+
+static unsigned char snmp_tag_cls2syntax(unsigned int tag,
+                                         unsigned int cls,
+                                         unsigned short *syntax)
+{
+	struct snmp_cnv *cnv;
+	
+	cnv = snmp_conv;
+	
+	while (cnv->syntax != -1) {
+		if (cnv->tag == tag && cnv->class == cls) {
+			*syntax = cnv->syntax;
+			return 1;
+		}
+		cnv++;
+	}
+	return 0;
+}
+
+static unsigned char snmp_object_decode(struct asn1_ctx *ctx,
+                                        struct snmp_object **obj)
+{
+	unsigned int cls, con, tag, len, idlen;
+	unsigned short type;
+	unsigned char *eoc, *end, *p;
+	unsigned long *lp, *id;
+	unsigned long ul;
+	long  l;
+	
+	*obj = NULL;
+	id = NULL;
+	
+	if (!asn1_header_decode(ctx, &eoc, &cls, &con, &tag))
+		return 0;
+		
+	if (cls != ASN1_UNI || con != ASN1_CON || tag != ASN1_SEQ)
+		return 0;
+	
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+		return 0;
+	
+	if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_OJI)
+		return 0;
+	
+	if (!asn1_oid_decode(ctx, end, &id, &idlen))
+		return 0;
+		
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag)) {
+		kfree(id);
+		return 0;
+	}
+	
+	if (con != ASN1_PRI) {
+		kfree(id);
+		return 0;
+	}
+	
+	if (!snmp_tag_cls2syntax(tag, cls, &type)) {
+		kfree(id);
+		return 0;
+	}
+	
+	switch (type) {
+		case SNMP_INTEGER:
+			len = sizeof(long);
+			if (!asn1_long_decode(ctx, end, &l)) {
+				kfree(id);
+				return 0;
+			}
+			*obj = kmalloc(sizeof(struct snmp_object) + len,
+			               GFP_ATOMIC);
+			if (*obj == NULL) {
+				kfree(id);
+				if (net_ratelimit())
+					printk("OOM in bsalg (%d)\n", __LINE__);
+				return 0;
+			}
+			(*obj)->syntax.l[0] = l;
+			break;
+		case SNMP_OCTETSTR:
+		case SNMP_OPAQUE:
+			if (!asn1_octets_decode(ctx, end, &p, &len)) {
+				kfree(id);
+				return 0;
+			}
+			*obj = kmalloc(sizeof(struct snmp_object) + len,
+			               GFP_ATOMIC);
+			if (*obj == NULL) {
+				kfree(id);
+				if (net_ratelimit())
+					printk("OOM in bsalg (%d)\n", __LINE__);
+				return 0;
+			}
+			memcpy((*obj)->syntax.c, p, len);
+			kfree(p);
+			break;
+		case SNMP_NULL:
+		case SNMP_NOSUCHOBJECT:
+		case SNMP_NOSUCHINSTANCE:
+		case SNMP_ENDOFMIBVIEW:
+			len = 0;
+			*obj = kmalloc(sizeof(struct snmp_object), GFP_ATOMIC);
+			if (*obj == NULL) {
+				kfree(id);
+				if (net_ratelimit())
+					printk("OOM in bsalg (%d)\n", __LINE__);
+				return 0;
+			}
+			if (!asn1_null_decode(ctx, end)) {
+				kfree(id);
+				kfree(*obj);
+				*obj = NULL;
+				return 0;
+			}
+			break;
+		case SNMP_OBJECTID:
+			if (!asn1_oid_decode(ctx, end, (unsigned long **)&lp, &len)) {
+				kfree(id);
+				return 0;
+			}
+			len *= sizeof(unsigned long);
+			*obj = kmalloc(sizeof(struct snmp_object) + len, GFP_ATOMIC);
+			if (*obj == NULL) {
+				kfree(id);
+				if (net_ratelimit())
+					printk("OOM in bsalg (%d)\n", __LINE__);
+				return 0;
+			}
+			memcpy((*obj)->syntax.ul, lp, len);
+			kfree(lp);
+			break;
+		case SNMP_IPADDR:
+			if (!asn1_octets_decode(ctx, end, &p, &len)) {
+				kfree(id);
+				return 0;
+			}
+			if (len != 4) {
+				kfree(p);
+				kfree(id);
+				return 0;
+			}
+			*obj = kmalloc(sizeof(struct snmp_object) + len, GFP_ATOMIC);
+			if (*obj == NULL) {
+				kfree(p);
+				kfree(id);
+				if (net_ratelimit())
+					printk("OOM in bsalg (%d)\n", __LINE__);
+				return 0;
+			}
+			memcpy((*obj)->syntax.uc, p, len);
+			kfree(p);
+			break;
+		case SNMP_COUNTER:
+		case SNMP_GAUGE:
+		case SNMP_TIMETICKS:
+			len = sizeof(unsigned long);
+			if (!asn1_ulong_decode(ctx, end, &ul)) {
+				kfree(id);
+				return 0;
+			}
+			*obj = kmalloc(sizeof(struct snmp_object) + len, GFP_ATOMIC);
+			if (*obj == NULL) {
+				kfree(id);
+				if (net_ratelimit())
+					printk("OOM in bsalg (%d)\n", __LINE__);
+				return 0;
+			}
+			(*obj)->syntax.ul[0] = ul;
+			break;
+		default:
+			kfree(id);
+			return 0;
+	}
+	
+	(*obj)->syntax_len = len;
+	(*obj)->type = type;
+	(*obj)->id = id;
+	(*obj)->id_len = idlen;
+	
+	if (!asn1_eoc_decode(ctx, eoc)) {
+		kfree(id);
+		kfree(*obj);
+		*obj = NULL;
+		return 0;
+	}
+	return 1;
+}
+
+static unsigned char snmp_request_decode(struct asn1_ctx *ctx,
+                                         struct snmp_request *request)
+{
+	unsigned int cls, con, tag;
+	unsigned char *end;
+	
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+		return 0;
+		
+	if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+		return 0;
+		
+	if (!asn1_ulong_decode(ctx, end, &request->id))
+		return 0;
+		
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+		return 0;
+		
+	if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+		return 0;
+		
+	if (!asn1_uint_decode(ctx, end, &request->error_status))
+		return 0;
+		
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+		return 0;
+		
+	if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+		return 0;
+		
+	if (!asn1_uint_decode(ctx, end, &request->error_index))
+		return 0;
+	
+	return 1;
+}
+
+/* 
+ * Fast checksum update for possibly oddly-aligned UDP byte, from the
+ * code example in the draft.
+ */
+static void fast_csum(unsigned char *csum,
+                      const unsigned char *optr,
+                      const unsigned char *nptr,
+                      int odd)
+{
+	long x, old, new;
+	
+	x = csum[0] * 256 + csum[1];
+	
+	x =~ x & 0xFFFF;
+	
+	if (odd) old = optr[0] * 256;
+	else old = optr[0];
+	
+	x -= old & 0xFFFF;
+	if (x <= 0) {
+		x--;
+		x &= 0xFFFF;
+	}
+	
+	if (odd) new = nptr[0] * 256;
+	else new = nptr[0];
+	
+	x += new & 0xFFFF;
+	if (x & 0x10000) {
+		x++;
+		x &= 0xFFFF;
+	}
+	
+	x =~ x & 0xFFFF;
+	csum[0] = x / 256;
+	csum[1] = x & 0xFF;
+}
+
+/* 
+ * Mangle IP address.
+ * 	- begin points to the start of the snmp messgae
+ *      - addr points to the start of the address
+ */
+static inline void mangle_address(unsigned char *begin,
+                                  unsigned char *addr,
+                                  const struct oct1_map *map,
+                                  u_int16_t *check)
+{
+	if (map->from == NOCT1(*addr)) {
+		u_int32_t old;
+		
+		if (debug)
+			memcpy(&old, (unsigned char *)addr, sizeof(old));
+			
+		*addr = map->to;
+		
+		/* Update UDP checksum if being used */
+		if (*check) {
+			unsigned char odd = !((addr - begin) % 2);
+			
+			fast_csum((unsigned char *)check,
+			          &map->from, &map->to, odd);
+			          
+		}
+		
+		if (debug)
+			printk(KERN_DEBUG "bsalg: mapped %u.%u.%u.%u to "
+			       "%u.%u.%u.%u\n", NIPQUAD(old), NIPQUAD(*addr));
+	}
+}
+
+static unsigned char snmp_trap_decode(struct asn1_ctx *ctx,
+                                      struct snmp_v1_trap *trap,
+                                      const struct oct1_map *map,
+                                      u_int16_t *check)
+{
+	unsigned int cls, con, tag, len;
+	unsigned char *end;
+
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+		return 0;
+		
+	if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_OJI)
+		return 0;
+	
+	if (!asn1_oid_decode(ctx, end, &trap->id, &trap->id_len))
+		return 0;
+		
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+		goto err_id_free;
+
+	if (!((cls == ASN1_APL && con == ASN1_PRI && tag == SNMP_IPA) ||
+	      (cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_OTS)))
+		goto err_id_free;
+	
+	if (!asn1_octets_decode(ctx, end, (unsigned char **)&trap->ip_address, &len))
+		goto err_id_free;
+	
+	/* IPv4 only */
+	if (len != 4)
+		goto err_addr_free;
+	
+	mangle_address(ctx->begin, ctx->pointer - 4, map, check);
+	
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+		goto err_addr_free;
+		
+	if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+		goto err_addr_free;
+		
+	if (!asn1_uint_decode(ctx, end, &trap->general))
+		goto err_addr_free;
+		
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+		goto err_addr_free;
+	
+	if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+		goto err_addr_free;
+		
+	if (!asn1_uint_decode(ctx, end, &trap->specific))
+		goto err_addr_free;
+		
+	if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+		goto err_addr_free;
+		
+	if (!((cls == ASN1_APL && con == ASN1_PRI && tag == SNMP_TIT) ||
+	      (cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_INT)))
+		goto err_addr_free;
+		
+	if (!asn1_ulong_decode(ctx, end, &trap->time))
+		goto err_addr_free;
+		
+	return 1;
+
+err_id_free:
+	kfree(trap->id);
+
+err_addr_free:
+	kfree((unsigned long *)trap->ip_address);
+	
+	return 0;
+}
+
+/*****************************************************************************
+ *
+ * Misc. routines
+ *
+ *****************************************************************************/
+
+static void hex_dump(unsigned char *buf, size_t len)
+{
+	size_t i;
+	
+	for (i = 0; i < len; i++) {
+		if (i && !(i % 16))
+			printk("\n");
+		printk("%02x ", *(buf + i));
+	}
+	printk("\n");
+}
+
+/*
+ * Parse and mangle SNMP message according to mapping.
+ * (And this is the fucking 'basic' method).
+ */
+static int snmp_parse_mangle(unsigned char *msg,
+                             u_int16_t len,
+                             const struct oct1_map *map,
+                             u_int16_t *check)
+{
+	unsigned char *eoc, *end;
+	unsigned int cls, con, tag, vers, pdutype;
+	struct asn1_ctx ctx;
+	struct asn1_octstr comm;
+	struct snmp_object **obj;
+	
+	if (debug > 1)
+		hex_dump(msg, len);
+
+	asn1_open(&ctx, msg, len);
+	
+	/* 
+	 * Start of SNMP message.
+	 */
+	if (!asn1_header_decode(&ctx, &eoc, &cls, &con, &tag))
+		return 0;
+	if (cls != ASN1_UNI || con != ASN1_CON || tag != ASN1_SEQ)
+		return 0;
+	
+	/* 
+	 * Version 1 or 2 handled.
+	 */
+	if (!asn1_header_decode(&ctx, &end, &cls, &con, &tag))
+		return 0;
+	if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+		return 0;
+	if (!asn1_uint_decode (&ctx, end, &vers))
+		return 0;
+	if (debug > 1)
+		printk(KERN_DEBUG "bsalg: snmp version: %u\n", vers + 1);
+	if (vers > 1)
+		return 1;
+	
+	/*
+	 * Community.
+	 */
+	if (!asn1_header_decode (&ctx, &end, &cls, &con, &tag))
+		return 0;
+	if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_OTS)
+		return 0;
+	if (!asn1_octets_decode(&ctx, end, &comm.data, &comm.len))
+		return 0;
+	if (debug > 1) {
+		unsigned int i;
+		
+		printk(KERN_DEBUG "bsalg: community: ");
+		for (i = 0; i < comm.len; i++)
+			printk("%c", comm.data[i]);
+		printk("\n");
+	}
+	kfree(comm.data);
+	
+	/*
+	 * PDU type
+	 */
+	if (!asn1_header_decode(&ctx, &eoc, &cls, &con, &pdutype))
+		return 0;
+	if (cls != ASN1_CTX || con != ASN1_CON)
+		return 0;
+	if (debug > 1) {
+		unsigned char *pdus[] = {
+			[SNMP_PDU_GET] = "get",
+			[SNMP_PDU_NEXT] = "get-next",
+			[SNMP_PDU_RESPONSE] = "response",
+			[SNMP_PDU_SET] = "set",
+			[SNMP_PDU_TRAP1] = "trapv1",
+			[SNMP_PDU_BULK] = "bulk",
+			[SNMP_PDU_INFORM] = "inform",
+			[SNMP_PDU_TRAP2] = "trapv2"
+		};
+		
+		if (pdutype > SNMP_PDU_TRAP2)
+			printk(KERN_DEBUG "bsalg: bad pdu type %u\n", pdutype);
+		else
+			printk(KERN_DEBUG "bsalg: pdu: %s\n", pdus[pdutype]);
+	}
+	if (pdutype != SNMP_PDU_RESPONSE &&
+	    pdutype != SNMP_PDU_TRAP1 && pdutype != SNMP_PDU_TRAP2)
+		return 1;
+	
+	/*
+	 * Request header or v1 trap
+	 */
+	if (pdutype == SNMP_PDU_TRAP1) {
+		struct snmp_v1_trap trap;
+		unsigned char ret = snmp_trap_decode(&ctx, &trap, map, check);
+		
+		/* Discard trap allocations regardless */
+		kfree(trap.id);
+		kfree((unsigned long *)trap.ip_address);
+		
+		if (!ret)
+			return ret;
+		
+	} else {
+		struct snmp_request req;
+		
+		if (!snmp_request_decode(&ctx, &req))
+			return 0;
+			
+		if (debug > 1)
+			printk(KERN_DEBUG "bsalg: request: id=0x%lx error_status=%u "
+			"error_index=%u\n", req.id, req.error_status,
+			req.error_index);
+	}
+	
+	/*
+	 * Loop through objects, look for IP addresses to mangle.
+	 */
+	if (!asn1_header_decode(&ctx, &eoc, &cls, &con, &tag))
+		return 0;
+		
+	if (cls != ASN1_UNI || con != ASN1_CON || tag != ASN1_SEQ)
+		return 0;
+	
+	obj = kmalloc(sizeof(struct snmp_object), GFP_ATOMIC);
+	if (obj == NULL) {
+		if (net_ratelimit())
+			printk(KERN_WARNING "OOM in bsalg(%d)\n", __LINE__);
+		return 0;	
+	}
+
+	while (!asn1_eoc_decode(&ctx, eoc)) {
+		unsigned int i;
+		
+		if (!snmp_object_decode(&ctx, obj)) {
+			if (*obj) {
+				if ((*obj)->id)
+					kfree((*obj)->id);
+				kfree(*obj);
+			}	
+			kfree(obj);
+			return 0;
+		}
+
+		if (debug > 1) {
+			printk(KERN_DEBUG "bsalg: object: ");
+			for (i = 0; i < (*obj)->id_len; i++) {
+				if (i > 0)
+					printk(".");
+				printk("%lu", (*obj)->id[i]);
+			}
+			printk(": type=%u\n", (*obj)->type);
+			
+		}
+
+		if ((*obj)->type == SNMP_IPADDR)
+			mangle_address(ctx.begin, ctx.pointer - 4 , map, check);
+		
+		kfree((*obj)->id);
+		kfree(*obj);
+	}
+	kfree(obj);
+	
+	if (!asn1_eoc_decode(&ctx, eoc))
+		return 0;
+		
+	return 1;
+}
+
+/*****************************************************************************
+ *
+ * NAT routines.
+ *
+ *****************************************************************************/
+
+/* 
+ * SNMP translation routine.
+ */
+static int snmp_translate(struct ip_conntrack *ct,
+                          enum ip_conntrack_info ctinfo,
+                          struct sk_buff **pskb)
+{
+	struct iphdr *iph = (*pskb)->nh.iph;
+	struct udphdr *udph = (struct udphdr *)((u_int32_t *)iph + iph->ihl);
+	u_int16_t udplen = ntohs(udph->len);
+	u_int16_t paylen = udplen - sizeof(struct udphdr);
+	int dir = CTINFO2DIR(ctinfo);
+	struct oct1_map map;
+
+	/*
+	 * Determine mappping for application layer addresses based
+	 * on NAT manipulations for the packet.
+	 */
+	if (dir == IP_CT_DIR_ORIGINAL) {
+		/* SNAT traps */
+		map.from = NOCT1(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip);
+		map.to = NOCT1(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip);
+	} else {
+		/* DNAT replies */
+		map.from = NOCT1(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip);
+		map.to = NOCT1(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip);
+	}
+	
+	if (map.from == map.to)
+		return NF_ACCEPT;
+	
+	if (!snmp_parse_mangle((unsigned char *)udph + sizeof(struct udphdr),
+	                       paylen, &map, &udph->check)) {
+		if (net_ratelimit())
+			printk(KERN_WARNING "bsalg: parser failed\n");
+		return NF_DROP;
+	}
+	return NF_ACCEPT;
+}
+
+/* We don't actually set up expectations, just adjust internal IP
+ * addresses if this is being NATted */
+static int help(struct sk_buff **pskb,
+		struct ip_conntrack *ct,
+		enum ip_conntrack_info ctinfo)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	unsigned int ret;
+	struct iphdr *iph = (*pskb)->nh.iph;
+	struct udphdr *udph = (struct udphdr *)((u_int32_t *)iph + iph->ihl);
+
+	/* SNMP replies and originating SNMP traps get mangled */
+	if (udph->source == ntohs(SNMP_PORT) && dir != IP_CT_DIR_REPLY)
+		return NF_ACCEPT;
+	if (udph->dest == ntohs(SNMP_TRAP_PORT) && dir != IP_CT_DIR_ORIGINAL)
+		return NF_ACCEPT;
+
+	/* No NAT? */
+	if (!(ct->status & IPS_NAT_MASK))
+		return NF_ACCEPT;
+
+	/* 
+	 * Make sure the packet length is ok.  So far, we were only guaranteed
+	 * to have a valid length IP header plus 8 bytes, which means we have
+	 * enough room for a UDP header.  Just verify the UDP length field so we
+	 * can mess around with the payload.
+	 */
+	if (ntohs(udph->len) != (*pskb)->len - (iph->ihl << 2)) {
+		 if (net_ratelimit())
+			 printk(KERN_WARNING "SNMP: dropping malformed packet "
+				"src=%u.%u.%u.%u dst=%u.%u.%u.%u\n",
+				NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
+		 return NF_DROP;
+	}
+
+	if (!skb_ip_make_writable(pskb, (*pskb)->len))
+		return NF_DROP;
+
+	spin_lock_bh(&snmp_lock);
+	ret = snmp_translate(ct, ctinfo, pskb);
+	spin_unlock_bh(&snmp_lock);
+	return ret;
+}
+
+static struct ip_conntrack_helper snmp_helper = {
+	.max_expected = 0,
+	.timeout = 180,
+	.me = THIS_MODULE,
+	.help = help,
+	.name = "snmp",
+
+	.tuple = { .src = { .u = { __constant_htons(SNMP_PORT) } },
+		   .dst = { .protonum = IPPROTO_UDP },
+	},
+	.mask = { .src = { .u = { 0xFFFF } },
+		 .dst = { .protonum = 0xFF },
+	},
+};
+
+static struct ip_conntrack_helper snmp_trap_helper = {
+	.max_expected = 0,
+	.timeout = 180,
+	.me = THIS_MODULE,
+	.help = help,
+	.name = "snmp_trap",
+
+	.tuple = { .src = { .u = { __constant_htons(SNMP_TRAP_PORT) } },
+		   .dst = { .protonum = IPPROTO_UDP },
+	},
+	.mask = { .src = { .u = { 0xFFFF } },
+		 .dst = { .protonum = 0xFF },
+	},
+};
+
+/*****************************************************************************
+ *
+ * Module stuff.
+ *
+ *****************************************************************************/
+ 
+static int __init init(void)
+{
+	int ret = 0;
+
+	ret = ip_conntrack_helper_register(&snmp_helper);
+	if (ret < 0)
+		return ret;
+	ret = ip_conntrack_helper_register(&snmp_trap_helper);
+	if (ret < 0) {
+		ip_conntrack_helper_unregister(&snmp_helper);
+		return ret;
+	}
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	ip_conntrack_helper_unregister(&snmp_helper);
+	ip_conntrack_helper_unregister(&snmp_trap_helper);
+}
+
+module_init(init);
+module_exit(fini);
+
+module_param(debug, bool, 0600);
diff --git a/net/ipv4/netfilter/ip_nat_standalone.c b/net/ipv4/netfilter/ip_nat_standalone.c
new file mode 100644
index 000000000000..dec4a74212cd
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_standalone.c
@@ -0,0 +1,349 @@
+/* This file contains all the functions required for the standalone
+   ip_nat module.
+
+   These are not required by the compatibility layer.
+*/
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * 23 Apr 2001: Harald Welte <laforge@gnumonks.org>
+ * 	- new API and handling of conntrack/nat helpers
+ * 	- now capable of multiple expectations for one master
+ * */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/icmp.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <net/ip.h>
+#include <net/checksum.h>
+#include <linux/spinlock.h>
+
+#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_nat_lock)
+#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_nat_lock)
+
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+#include <linux/netfilter_ipv4/ip_nat_core.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#define HOOKNAME(hooknum) ((hooknum) == NF_IP_POST_ROUTING ? "POST_ROUTING"  \
+			   : ((hooknum) == NF_IP_PRE_ROUTING ? "PRE_ROUTING" \
+			      : ((hooknum) == NF_IP_LOCAL_OUT ? "LOCAL_OUT"  \
+			         : ((hooknum) == NF_IP_LOCAL_IN ? "LOCAL_IN"  \
+				    : "*ERROR*")))
+
+static unsigned int
+ip_nat_fn(unsigned int hooknum,
+	  struct sk_buff **pskb,
+	  const struct net_device *in,
+	  const struct net_device *out,
+	  int (*okfn)(struct sk_buff *))
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	struct ip_nat_info *info;
+	/* maniptype == SRC for postrouting. */
+	enum ip_nat_manip_type maniptype = HOOK2MANIP(hooknum);
+
+	/* We never see fragments: conntrack defrags on pre-routing
+	   and local-out, and ip_nat_out protects post-routing. */
+	IP_NF_ASSERT(!((*pskb)->nh.iph->frag_off
+		       & htons(IP_MF|IP_OFFSET)));
+
+	(*pskb)->nfcache |= NFC_UNKNOWN;
+
+	/* If we had a hardware checksum before, it's now invalid */
+	if ((*pskb)->ip_summed == CHECKSUM_HW)
+		if (skb_checksum_help(*pskb, (out == NULL)))
+			return NF_DROP;
+
+	ct = ip_conntrack_get(*pskb, &ctinfo);
+	/* Can't track?  It's not due to stress, or conntrack would
+	   have dropped it.  Hence it's the user's responsibilty to
+	   packet filter it out, or implement conntrack/NAT for that
+	   protocol. 8) --RR */
+	if (!ct) {
+		/* Exception: ICMP redirect to new connection (not in
+                   hash table yet).  We must not let this through, in
+                   case we're doing NAT to the same network. */
+		if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+			struct icmphdr _hdr, *hp;
+
+			hp = skb_header_pointer(*pskb,
+						(*pskb)->nh.iph->ihl*4,
+						sizeof(_hdr), &_hdr);
+			if (hp != NULL &&
+			    hp->type == ICMP_REDIRECT)
+				return NF_DROP;
+		}
+		return NF_ACCEPT;
+	}
+
+	switch (ctinfo) {
+	case IP_CT_RELATED:
+	case IP_CT_RELATED+IP_CT_IS_REPLY:
+		if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+			if (!icmp_reply_translation(pskb, ct, maniptype,
+						    CTINFO2DIR(ctinfo)))
+				return NF_DROP;
+			else
+				return NF_ACCEPT;
+		}
+		/* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
+	case IP_CT_NEW:
+		info = &ct->nat.info;
+
+		/* Seen it before?  This can happen for loopback, retrans,
+		   or local packets.. */
+		if (!ip_nat_initialized(ct, maniptype)) {
+			unsigned int ret;
+
+			/* LOCAL_IN hook doesn't have a chain!  */
+			if (hooknum == NF_IP_LOCAL_IN)
+				ret = alloc_null_binding(ct, info, hooknum);
+			else
+				ret = ip_nat_rule_find(pskb, hooknum,
+						       in, out, ct,
+						       info);
+
+			if (ret != NF_ACCEPT) {
+				return ret;
+			}
+		} else
+			DEBUGP("Already setup manip %s for ct %p\n",
+			       maniptype == IP_NAT_MANIP_SRC ? "SRC" : "DST",
+			       ct);
+		break;
+
+	default:
+		/* ESTABLISHED */
+		IP_NF_ASSERT(ctinfo == IP_CT_ESTABLISHED
+			     || ctinfo == (IP_CT_ESTABLISHED+IP_CT_IS_REPLY));
+		info = &ct->nat.info;
+	}
+
+	IP_NF_ASSERT(info);
+	return nat_packet(ct, ctinfo, hooknum, pskb);
+}
+
+static unsigned int
+ip_nat_in(unsigned int hooknum,
+          struct sk_buff **pskb,
+          const struct net_device *in,
+          const struct net_device *out,
+          int (*okfn)(struct sk_buff *))
+{
+	u_int32_t saddr, daddr;
+	unsigned int ret;
+
+	saddr = (*pskb)->nh.iph->saddr;
+	daddr = (*pskb)->nh.iph->daddr;
+
+	ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
+	if (ret != NF_DROP && ret != NF_STOLEN
+	    && ((*pskb)->nh.iph->saddr != saddr
+	        || (*pskb)->nh.iph->daddr != daddr)) {
+		dst_release((*pskb)->dst);
+		(*pskb)->dst = NULL;
+	}
+	return ret;
+}
+
+static unsigned int
+ip_nat_out(unsigned int hooknum,
+	   struct sk_buff **pskb,
+	   const struct net_device *in,
+	   const struct net_device *out,
+	   int (*okfn)(struct sk_buff *))
+{
+	/* root is playing with raw sockets. */
+	if ((*pskb)->len < sizeof(struct iphdr)
+	    || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+		return NF_ACCEPT;
+
+	/* We can hit fragment here; forwarded packets get
+	   defragmented by connection tracking coming in, then
+	   fragmented (grr) by the forward code.
+
+	   In future: If we have nfct != NULL, AND we have NAT
+	   initialized, AND there is no helper, then we can do full
+	   NAPT on the head, and IP-address-only NAT on the rest.
+
+	   I'm starting to have nightmares about fragments.  */
+
+	if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
+		*pskb = ip_ct_gather_frags(*pskb, IP_DEFRAG_NAT_OUT);
+
+		if (!*pskb)
+			return NF_STOLEN;
+	}
+
+	return ip_nat_fn(hooknum, pskb, in, out, okfn);
+}
+
+static unsigned int
+ip_nat_local_fn(unsigned int hooknum,
+		struct sk_buff **pskb,
+		const struct net_device *in,
+		const struct net_device *out,
+		int (*okfn)(struct sk_buff *))
+{
+	u_int32_t saddr, daddr;
+	unsigned int ret;
+
+	/* root is playing with raw sockets. */
+	if ((*pskb)->len < sizeof(struct iphdr)
+	    || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+		return NF_ACCEPT;
+
+	saddr = (*pskb)->nh.iph->saddr;
+	daddr = (*pskb)->nh.iph->daddr;
+
+	ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
+	if (ret != NF_DROP && ret != NF_STOLEN
+	    && ((*pskb)->nh.iph->saddr != saddr
+		|| (*pskb)->nh.iph->daddr != daddr))
+		return ip_route_me_harder(pskb) == 0 ? ret : NF_DROP;
+	return ret;
+}
+
+/* We must be after connection tracking and before packet filtering. */
+
+/* Before packet filtering, change destination */
+static struct nf_hook_ops ip_nat_in_ops = {
+	.hook		= ip_nat_in,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_PRE_ROUTING,
+	.priority	= NF_IP_PRI_NAT_DST,
+};
+
+/* After packet filtering, change source */
+static struct nf_hook_ops ip_nat_out_ops = {
+	.hook		= ip_nat_out,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_POST_ROUTING,
+	.priority	= NF_IP_PRI_NAT_SRC,
+};
+
+/* Before packet filtering, change destination */
+static struct nf_hook_ops ip_nat_local_out_ops = {
+	.hook		= ip_nat_local_fn,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_LOCAL_OUT,
+	.priority	= NF_IP_PRI_NAT_DST,
+};
+
+/* After packet filtering, change source for reply packets of LOCAL_OUT DNAT */
+static struct nf_hook_ops ip_nat_local_in_ops = {
+	.hook		= ip_nat_fn,
+	.owner		= THIS_MODULE,
+	.pf		= PF_INET,
+	.hooknum	= NF_IP_LOCAL_IN,
+	.priority	= NF_IP_PRI_NAT_SRC,
+};
+
+static int init_or_cleanup(int init)
+{
+	int ret = 0;
+
+	need_ip_conntrack();
+
+	if (!init) goto cleanup;
+
+	ret = ip_nat_rule_init();
+	if (ret < 0) {
+		printk("ip_nat_init: can't setup rules.\n");
+		goto cleanup_nothing;
+	}
+	ret = ip_nat_init();
+	if (ret < 0) {
+		printk("ip_nat_init: can't setup rules.\n");
+		goto cleanup_rule_init;
+	}
+	ret = nf_register_hook(&ip_nat_in_ops);
+	if (ret < 0) {
+		printk("ip_nat_init: can't register in hook.\n");
+		goto cleanup_nat;
+	}
+	ret = nf_register_hook(&ip_nat_out_ops);
+	if (ret < 0) {
+		printk("ip_nat_init: can't register out hook.\n");
+		goto cleanup_inops;
+	}
+	ret = nf_register_hook(&ip_nat_local_out_ops);
+	if (ret < 0) {
+		printk("ip_nat_init: can't register local out hook.\n");
+		goto cleanup_outops;
+	}
+	ret = nf_register_hook(&ip_nat_local_in_ops);
+	if (ret < 0) {
+		printk("ip_nat_init: can't register local in hook.\n");
+		goto cleanup_localoutops;
+	}
+	return ret;
+
+ cleanup:
+	nf_unregister_hook(&ip_nat_local_in_ops);
+ cleanup_localoutops:
+	nf_unregister_hook(&ip_nat_local_out_ops);
+ cleanup_outops:
+	nf_unregister_hook(&ip_nat_out_ops);
+ cleanup_inops:
+	nf_unregister_hook(&ip_nat_in_ops);
+ cleanup_nat:
+	ip_nat_cleanup();
+ cleanup_rule_init:
+	ip_nat_rule_cleanup();
+ cleanup_nothing:
+	MUST_BE_READ_WRITE_UNLOCKED(&ip_nat_lock);
+	return ret;
+}
+
+static int __init init(void)
+{
+	return init_or_cleanup(1);
+}
+
+static void __exit fini(void)
+{
+	init_or_cleanup(0);
+}
+
+module_init(init);
+module_exit(fini);
+
+EXPORT_SYMBOL(ip_nat_setup_info);
+EXPORT_SYMBOL(ip_nat_protocol_register);
+EXPORT_SYMBOL(ip_nat_protocol_unregister);
+EXPORT_SYMBOL(ip_nat_cheat_check);
+EXPORT_SYMBOL(ip_nat_mangle_tcp_packet);
+EXPORT_SYMBOL(ip_nat_mangle_udp_packet);
+EXPORT_SYMBOL(ip_nat_used_tuple);
+EXPORT_SYMBOL(ip_nat_follow_master);
+MODULE_LICENSE("GPL");
diff --git a/net/ipv4/netfilter/ip_nat_tftp.c b/net/ipv4/netfilter/ip_nat_tftp.c
new file mode 100644
index 000000000000..0343e0d64674
--- /dev/null
+++ b/net/ipv4/netfilter/ip_nat_tftp.c
@@ -0,0 +1,70 @@
+/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Version: 0.0.7
+ *
+ * Thu 21 Mar 2002 Harald Welte <laforge@gnumonks.org>
+ * 	- Port to newnat API
+ *
+ * This module currently supports DNAT:
+ * iptables -t nat -A PREROUTING -d x.x.x.x -j DNAT --to-dest x.x.x.y
+ *
+ * and SNAT:
+ * iptables -t nat -A POSTROUTING { -j MASQUERADE , -j SNAT --to-source x.x.x.x }
+ *
+ * It has not been tested with
+ * -j SNAT --to-source x.x.x.x-x.x.x.y since I only have one external ip
+ * If you do test this please let me know if it works or not.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_tftp.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/moduleparam.h>
+
+MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
+MODULE_DESCRIPTION("tftp NAT helper");
+MODULE_LICENSE("GPL");
+
+static unsigned int help(struct sk_buff **pskb,
+			 enum ip_conntrack_info ctinfo,
+			 struct ip_conntrack_expect *exp)
+{
+	exp->saved_proto.udp.port = exp->tuple.dst.u.tcp.port;
+	exp->dir = IP_CT_DIR_REPLY;
+	exp->expectfn = ip_nat_follow_master;
+	if (ip_conntrack_expect_related(exp) != 0) {
+		ip_conntrack_expect_free(exp);
+		return NF_DROP;
+	}
+	return NF_ACCEPT;
+}
+
+static void __exit fini(void)
+{
+	ip_nat_tftp_hook = NULL;
+	/* Make sure noone calls it, meanwhile. */
+	synchronize_net();
+}
+
+static int __init init(void)
+{
+	BUG_ON(ip_nat_tftp_hook);
+	ip_nat_tftp_hook = help;
+	return 0;
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_queue.c b/net/ipv4/netfilter/ip_queue.c
new file mode 100644
index 000000000000..9e40dffc204f
--- /dev/null
+++ b/net/ipv4/netfilter/ip_queue.c
@@ -0,0 +1,741 @@
+/*
+ * This is a module which is used for queueing IPv4 packets and
+ * communicating with userspace via netlink.
+ *
+ * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 2000-03-27: Simplified code (thanks to Andi Kleen for clues).
+ * 2000-05-20: Fixed notifier problems (following Miguel Freitas' report).
+ * 2000-06-19: Fixed so nfmark is copied to metadata (reported by Sebastian 
+ *             Zander).
+ * 2000-08-01: Added Nick Williams' MAC support.
+ * 2002-06-25: Code cleanup.
+ * 2005-01-10: Added /proc counter for dropped packets; fixed so
+ *             packets aren't delivered to user space if they're going 
+ *             to be dropped. 
+ *
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/ip.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_queue.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netlink.h>
+#include <linux/spinlock.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <linux/security.h>
+#include <net/sock.h>
+#include <net/route.h>
+
+#define IPQ_QMAX_DEFAULT 1024
+#define IPQ_PROC_FS_NAME "ip_queue"
+#define NET_IPQ_QMAX 2088
+#define NET_IPQ_QMAX_NAME "ip_queue_maxlen"
+
+struct ipq_rt_info {
+	__u8 tos;
+	__u32 daddr;
+	__u32 saddr;
+};
+
+struct ipq_queue_entry {
+	struct list_head list;
+	struct nf_info *info;
+	struct sk_buff *skb;
+	struct ipq_rt_info rt_info;
+};
+
+typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long);
+
+static unsigned char copy_mode = IPQ_COPY_NONE;
+static unsigned int queue_maxlen = IPQ_QMAX_DEFAULT;
+static DEFINE_RWLOCK(queue_lock);
+static int peer_pid;
+static unsigned int copy_range;
+static unsigned int queue_total;
+static unsigned int queue_dropped = 0;
+static unsigned int queue_user_dropped = 0;
+static struct sock *ipqnl;
+static LIST_HEAD(queue_list);
+static DECLARE_MUTEX(ipqnl_sem);
+
+static void
+ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict)
+{
+	nf_reinject(entry->skb, entry->info, verdict);
+	kfree(entry);
+}
+
+static inline void
+__ipq_enqueue_entry(struct ipq_queue_entry *entry)
+{
+       list_add(&entry->list, &queue_list);
+       queue_total++;
+}
+
+/*
+ * Find and return a queued entry matched by cmpfn, or return the last
+ * entry if cmpfn is NULL.
+ */
+static inline struct ipq_queue_entry *
+__ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data)
+{
+	struct list_head *p;
+
+	list_for_each_prev(p, &queue_list) {
+		struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p;
+		
+		if (!cmpfn || cmpfn(entry, data))
+			return entry;
+	}
+	return NULL;
+}
+
+static inline void
+__ipq_dequeue_entry(struct ipq_queue_entry *entry)
+{
+	list_del(&entry->list);
+	queue_total--;
+}
+
+static inline struct ipq_queue_entry *
+__ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
+{
+	struct ipq_queue_entry *entry;
+
+	entry = __ipq_find_entry(cmpfn, data);
+	if (entry == NULL)
+		return NULL;
+
+	__ipq_dequeue_entry(entry);
+	return entry;
+}
+
+
+static inline void
+__ipq_flush(int verdict)
+{
+	struct ipq_queue_entry *entry;
+	
+	while ((entry = __ipq_find_dequeue_entry(NULL, 0)))
+		ipq_issue_verdict(entry, verdict);
+}
+
+static inline int
+__ipq_set_mode(unsigned char mode, unsigned int range)
+{
+	int status = 0;
+	
+	switch(mode) {
+	case IPQ_COPY_NONE:
+	case IPQ_COPY_META:
+		copy_mode = mode;
+		copy_range = 0;
+		break;
+		
+	case IPQ_COPY_PACKET:
+		copy_mode = mode;
+		copy_range = range;
+		if (copy_range > 0xFFFF)
+			copy_range = 0xFFFF;
+		break;
+		
+	default:
+		status = -EINVAL;
+
+	}
+	return status;
+}
+
+static inline void
+__ipq_reset(void)
+{
+	peer_pid = 0;
+	net_disable_timestamp();
+	__ipq_set_mode(IPQ_COPY_NONE, 0);
+	__ipq_flush(NF_DROP);
+}
+
+static struct ipq_queue_entry *
+ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
+{
+	struct ipq_queue_entry *entry;
+	
+	write_lock_bh(&queue_lock);
+	entry = __ipq_find_dequeue_entry(cmpfn, data);
+	write_unlock_bh(&queue_lock);
+	return entry;
+}
+
+static void
+ipq_flush(int verdict)
+{
+	write_lock_bh(&queue_lock);
+	__ipq_flush(verdict);
+	write_unlock_bh(&queue_lock);
+}
+
+static struct sk_buff *
+ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
+{
+	unsigned char *old_tail;
+	size_t size = 0;
+	size_t data_len = 0;
+	struct sk_buff *skb;
+	struct ipq_packet_msg *pmsg;
+	struct nlmsghdr *nlh;
+
+	read_lock_bh(&queue_lock);
+	
+	switch (copy_mode) {
+	case IPQ_COPY_META:
+	case IPQ_COPY_NONE:
+		size = NLMSG_SPACE(sizeof(*pmsg));
+		data_len = 0;
+		break;
+	
+	case IPQ_COPY_PACKET:
+		if (copy_range == 0 || copy_range > entry->skb->len)
+			data_len = entry->skb->len;
+		else
+			data_len = copy_range;
+		
+		size = NLMSG_SPACE(sizeof(*pmsg) + data_len);
+		break;
+	
+	default:
+		*errp = -EINVAL;
+		read_unlock_bh(&queue_lock);
+		return NULL;
+	}
+
+	read_unlock_bh(&queue_lock);
+
+	skb = alloc_skb(size, GFP_ATOMIC);
+	if (!skb)
+		goto nlmsg_failure;
+		
+	old_tail= skb->tail;
+	nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
+	pmsg = NLMSG_DATA(nlh);
+	memset(pmsg, 0, sizeof(*pmsg));
+
+	pmsg->packet_id       = (unsigned long )entry;
+	pmsg->data_len        = data_len;
+	pmsg->timestamp_sec   = entry->skb->stamp.tv_sec;
+	pmsg->timestamp_usec  = entry->skb->stamp.tv_usec;
+	pmsg->mark            = entry->skb->nfmark;
+	pmsg->hook            = entry->info->hook;
+	pmsg->hw_protocol     = entry->skb->protocol;
+	
+	if (entry->info->indev)
+		strcpy(pmsg->indev_name, entry->info->indev->name);
+	else
+		pmsg->indev_name[0] = '\0';
+	
+	if (entry->info->outdev)
+		strcpy(pmsg->outdev_name, entry->info->outdev->name);
+	else
+		pmsg->outdev_name[0] = '\0';
+	
+	if (entry->info->indev && entry->skb->dev) {
+		pmsg->hw_type = entry->skb->dev->type;
+		if (entry->skb->dev->hard_header_parse)
+			pmsg->hw_addrlen =
+				entry->skb->dev->hard_header_parse(entry->skb,
+				                                   pmsg->hw_addr);
+	}
+	
+	if (data_len)
+		if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len))
+			BUG();
+		
+	nlh->nlmsg_len = skb->tail - old_tail;
+	return skb;
+
+nlmsg_failure:
+	if (skb)
+		kfree_skb(skb);
+	*errp = -EINVAL;
+	printk(KERN_ERR "ip_queue: error creating packet message\n");
+	return NULL;
+}
+
+static int
+ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info, void *data)
+{
+	int status = -EINVAL;
+	struct sk_buff *nskb;
+	struct ipq_queue_entry *entry;
+
+	if (copy_mode == IPQ_COPY_NONE)
+		return -EAGAIN;
+
+	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
+	if (entry == NULL) {
+		printk(KERN_ERR "ip_queue: OOM in ipq_enqueue_packet()\n");
+		return -ENOMEM;
+	}
+
+	entry->info = info;
+	entry->skb = skb;
+
+	if (entry->info->hook == NF_IP_LOCAL_OUT) {
+		struct iphdr *iph = skb->nh.iph;
+
+		entry->rt_info.tos = iph->tos;
+		entry->rt_info.daddr = iph->daddr;
+		entry->rt_info.saddr = iph->saddr;
+	}
+
+	nskb = ipq_build_packet_message(entry, &status);
+	if (nskb == NULL)
+		goto err_out_free;
+		
+	write_lock_bh(&queue_lock);
+	
+	if (!peer_pid)
+		goto err_out_free_nskb; 
+
+	if (queue_total >= queue_maxlen) {
+                queue_dropped++;
+		status = -ENOSPC;
+		if (net_ratelimit())
+		          printk (KERN_WARNING "ip_queue: full at %d entries, "
+				  "dropping packets(s). Dropped: %d\n", queue_total,
+				  queue_dropped);
+		goto err_out_free_nskb;
+	}
+
+ 	/* netlink_unicast will either free the nskb or attach it to a socket */ 
+	status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT);
+	if (status < 0) {
+	        queue_user_dropped++;
+		goto err_out_unlock;
+	}
+
+	__ipq_enqueue_entry(entry);
+
+	write_unlock_bh(&queue_lock);
+	return status;
+
+err_out_free_nskb:
+	kfree_skb(nskb); 
+	
+err_out_unlock:
+	write_unlock_bh(&queue_lock);
+
+err_out_free:
+	kfree(entry);
+	return status;
+}
+
+static int
+ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
+{
+	int diff;
+	struct iphdr *user_iph = (struct iphdr *)v->payload;
+
+	if (v->data_len < sizeof(*user_iph))
+		return 0;
+	diff = v->data_len - e->skb->len;
+	if (diff < 0)
+		skb_trim(e->skb, v->data_len);
+	else if (diff > 0) {
+		if (v->data_len > 0xFFFF)
+			return -EINVAL;
+		if (diff > skb_tailroom(e->skb)) {
+			struct sk_buff *newskb;
+			
+			newskb = skb_copy_expand(e->skb,
+			                         skb_headroom(e->skb),
+			                         diff,
+			                         GFP_ATOMIC);
+			if (newskb == NULL) {
+				printk(KERN_WARNING "ip_queue: OOM "
+				      "in mangle, dropping packet\n");
+				return -ENOMEM;
+			}
+			if (e->skb->sk)
+				skb_set_owner_w(newskb, e->skb->sk);
+			kfree_skb(e->skb);
+			e->skb = newskb;
+		}
+		skb_put(e->skb, diff);
+	}
+	if (!skb_ip_make_writable(&e->skb, v->data_len))
+		return -ENOMEM;
+	memcpy(e->skb->data, v->payload, v->data_len);
+	e->skb->nfcache |= NFC_ALTERED;
+
+	/*
+	 * Extra routing may needed on local out, as the QUEUE target never
+	 * returns control to the table.
+	 */
+	if (e->info->hook == NF_IP_LOCAL_OUT) {
+		struct iphdr *iph = e->skb->nh.iph;
+
+		if (!(iph->tos == e->rt_info.tos
+		      && iph->daddr == e->rt_info.daddr
+		      && iph->saddr == e->rt_info.saddr))
+			return ip_route_me_harder(&e->skb);
+	}
+	return 0;
+}
+
+static inline int
+id_cmp(struct ipq_queue_entry *e, unsigned long id)
+{
+	return (id == (unsigned long )e);
+}
+
+static int
+ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len)
+{
+	struct ipq_queue_entry *entry;
+
+	if (vmsg->value > NF_MAX_VERDICT)
+		return -EINVAL;
+
+	entry = ipq_find_dequeue_entry(id_cmp, vmsg->id);
+	if (entry == NULL)
+		return -ENOENT;
+	else {
+		int verdict = vmsg->value;
+		
+		if (vmsg->data_len && vmsg->data_len == len)
+			if (ipq_mangle_ipv4(vmsg, entry) < 0)
+				verdict = NF_DROP;
+		
+		ipq_issue_verdict(entry, verdict);
+		return 0;
+	}
+}
+
+static int
+ipq_set_mode(unsigned char mode, unsigned int range)
+{
+	int status;
+
+	write_lock_bh(&queue_lock);
+	status = __ipq_set_mode(mode, range);
+	write_unlock_bh(&queue_lock);
+	return status;
+}
+
+static int
+ipq_receive_peer(struct ipq_peer_msg *pmsg,
+                 unsigned char type, unsigned int len)
+{
+	int status = 0;
+
+	if (len < sizeof(*pmsg))
+		return -EINVAL;
+
+	switch (type) {
+	case IPQM_MODE:
+		status = ipq_set_mode(pmsg->msg.mode.value,
+		                      pmsg->msg.mode.range);
+		break;
+		
+	case IPQM_VERDICT:
+		if (pmsg->msg.verdict.value > NF_MAX_VERDICT)
+			status = -EINVAL;
+		else
+			status = ipq_set_verdict(&pmsg->msg.verdict,
+			                         len - sizeof(*pmsg));
+			break;
+	default:
+		status = -EINVAL;
+	}
+	return status;
+}
+
+static int
+dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex)
+{
+	if (entry->info->indev)
+		if (entry->info->indev->ifindex == ifindex)
+			return 1;
+			
+	if (entry->info->outdev)
+		if (entry->info->outdev->ifindex == ifindex)
+			return 1;
+
+	return 0;
+}
+
+static void
+ipq_dev_drop(int ifindex)
+{
+	struct ipq_queue_entry *entry;
+	
+	while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL)
+		ipq_issue_verdict(entry, NF_DROP);
+}
+
+#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
+
+static inline void
+ipq_rcv_skb(struct sk_buff *skb)
+{
+	int status, type, pid, flags, nlmsglen, skblen;
+	struct nlmsghdr *nlh;
+
+	skblen = skb->len;
+	if (skblen < sizeof(*nlh))
+		return;
+
+	nlh = (struct nlmsghdr *)skb->data;
+	nlmsglen = nlh->nlmsg_len;
+	if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
+		return;
+
+	pid = nlh->nlmsg_pid;
+	flags = nlh->nlmsg_flags;
+	
+	if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI)
+		RCV_SKB_FAIL(-EINVAL);
+		
+	if (flags & MSG_TRUNC)
+		RCV_SKB_FAIL(-ECOMM);
+		
+	type = nlh->nlmsg_type;
+	if (type < NLMSG_NOOP || type >= IPQM_MAX)
+		RCV_SKB_FAIL(-EINVAL);
+		
+	if (type <= IPQM_BASE)
+		return;
+		
+	if (security_netlink_recv(skb))
+		RCV_SKB_FAIL(-EPERM);
+	
+	write_lock_bh(&queue_lock);
+	
+	if (peer_pid) {
+		if (peer_pid != pid) {
+			write_unlock_bh(&queue_lock);
+			RCV_SKB_FAIL(-EBUSY);
+		}
+	} else {
+		net_enable_timestamp();
+		peer_pid = pid;
+	}
+		
+	write_unlock_bh(&queue_lock);
+	
+	status = ipq_receive_peer(NLMSG_DATA(nlh), type,
+	                          skblen - NLMSG_LENGTH(0));
+	if (status < 0)
+		RCV_SKB_FAIL(status);
+		
+	if (flags & NLM_F_ACK)
+		netlink_ack(skb, nlh, 0);
+        return;
+}
+
+static void
+ipq_rcv_sk(struct sock *sk, int len)
+{
+	do {
+		struct sk_buff *skb;
+
+		if (down_trylock(&ipqnl_sem))
+			return;
+			
+		while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+			ipq_rcv_skb(skb);
+			kfree_skb(skb);
+		}
+		
+		up(&ipqnl_sem);
+
+	} while (ipqnl && ipqnl->sk_receive_queue.qlen);
+}
+
+static int
+ipq_rcv_dev_event(struct notifier_block *this,
+                  unsigned long event, void *ptr)
+{
+	struct net_device *dev = ptr;
+
+	/* Drop any packets associated with the downed device */
+	if (event == NETDEV_DOWN)
+		ipq_dev_drop(dev->ifindex);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block ipq_dev_notifier = {
+	.notifier_call	= ipq_rcv_dev_event,
+};
+
+static int
+ipq_rcv_nl_event(struct notifier_block *this,
+                 unsigned long event, void *ptr)
+{
+	struct netlink_notify *n = ptr;
+
+	if (event == NETLINK_URELEASE &&
+	    n->protocol == NETLINK_FIREWALL && n->pid) {
+		write_lock_bh(&queue_lock);
+		if (n->pid == peer_pid)
+			__ipq_reset();
+		write_unlock_bh(&queue_lock);
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block ipq_nl_notifier = {
+	.notifier_call	= ipq_rcv_nl_event,
+};
+
+static struct ctl_table_header *ipq_sysctl_header;
+
+static ctl_table ipq_table[] = {
+	{
+		.ctl_name	= NET_IPQ_QMAX,
+		.procname	= NET_IPQ_QMAX_NAME,
+		.data		= &queue_maxlen,
+		.maxlen		= sizeof(queue_maxlen),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec
+	},
+ 	{ .ctl_name = 0 }
+};
+
+static ctl_table ipq_dir_table[] = {
+	{
+		.ctl_name	= NET_IPV4,
+		.procname	= "ipv4",
+		.mode		= 0555,
+		.child		= ipq_table
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table ipq_root_table[] = {
+	{
+		.ctl_name	= CTL_NET,
+		.procname	= "net",
+		.mode		= 0555,
+		.child		= ipq_dir_table
+	},
+	{ .ctl_name = 0 }
+};
+
+#ifdef CONFIG_PROC_FS
+static int
+ipq_get_info(char *buffer, char **start, off_t offset, int length)
+{
+	int len;
+
+	read_lock_bh(&queue_lock);
+	
+	len = sprintf(buffer,
+	              "Peer PID          : %d\n"
+	              "Copy mode         : %hu\n"
+	              "Copy range        : %u\n"
+	              "Queue length      : %u\n"
+	              "Queue max. length : %u\n"
+		      "Queue dropped     : %u\n"
+		      "Netlink dropped   : %u\n",
+	              peer_pid,
+	              copy_mode,
+	              copy_range,
+	              queue_total,
+	              queue_maxlen,
+		      queue_dropped,
+		      queue_user_dropped);
+
+	read_unlock_bh(&queue_lock);
+	
+	*start = buffer + offset;
+	len -= offset;
+	if (len > length)
+		len = length;
+	else if (len < 0)
+		len = 0;
+	return len;
+}
+#endif /* CONFIG_PROC_FS */
+
+static int
+init_or_cleanup(int init)
+{
+	int status = -ENOMEM;
+	struct proc_dir_entry *proc;
+	
+	if (!init)
+		goto cleanup;
+
+	netlink_register_notifier(&ipq_nl_notifier);
+	ipqnl = netlink_kernel_create(NETLINK_FIREWALL, ipq_rcv_sk);
+	if (ipqnl == NULL) {
+		printk(KERN_ERR "ip_queue: failed to create netlink socket\n");
+		goto cleanup_netlink_notifier;
+	}
+
+	proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info);
+	if (proc)
+		proc->owner = THIS_MODULE;
+	else {
+		printk(KERN_ERR "ip_queue: failed to create proc entry\n");
+		goto cleanup_ipqnl;
+	}
+	
+	register_netdevice_notifier(&ipq_dev_notifier);
+	ipq_sysctl_header = register_sysctl_table(ipq_root_table, 0);
+	
+	status = nf_register_queue_handler(PF_INET, ipq_enqueue_packet, NULL);
+	if (status < 0) {
+		printk(KERN_ERR "ip_queue: failed to register queue handler\n");
+		goto cleanup_sysctl;
+	}
+	return status;
+
+cleanup:
+	nf_unregister_queue_handler(PF_INET);
+	synchronize_net();
+	ipq_flush(NF_DROP);
+	
+cleanup_sysctl:
+	unregister_sysctl_table(ipq_sysctl_header);
+	unregister_netdevice_notifier(&ipq_dev_notifier);
+	proc_net_remove(IPQ_PROC_FS_NAME);
+	
+cleanup_ipqnl:
+	sock_release(ipqnl->sk_socket);
+	down(&ipqnl_sem);
+	up(&ipqnl_sem);
+	
+cleanup_netlink_notifier:
+	netlink_unregister_notifier(&ipq_nl_notifier);
+	return status;
+}
+
+static int __init init(void)
+{
+	
+	return init_or_cleanup(1);
+}
+
+static void __exit fini(void)
+{
+	init_or_cleanup(0);
+}
+
+MODULE_DESCRIPTION("IPv4 packet queue handler");
+MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
+MODULE_LICENSE("GPL");
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
new file mode 100644
index 000000000000..8a54f92b8496
--- /dev/null
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -0,0 +1,1964 @@
+/*
+ * Packet matching code.
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 19 Jan 2002 Harald Welte <laforge@gnumonks.org>
+ * 	- increase module usage count as soon as we have rules inside
+ * 	  a table
+ */
+#include <linux/config.h>
+#include <linux/cache.h>
+#include <linux/skbuff.h>
+#include <linux/kmod.h>
+#include <linux/vmalloc.h>
+#include <linux/netdevice.h>
+#include <linux/module.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/icmp.h>
+#include <net/ip.h>
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+#include <linux/proc_fs.h>
+#include <linux/err.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("IPv4 packet filter");
+
+/*#define DEBUG_IP_FIREWALL*/
+/*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
+/*#define DEBUG_IP_FIREWALL_USER*/
+
+#ifdef DEBUG_IP_FIREWALL
+#define dprintf(format, args...)  printk(format , ## args)
+#else
+#define dprintf(format, args...)
+#endif
+
+#ifdef DEBUG_IP_FIREWALL_USER
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+#ifdef CONFIG_NETFILTER_DEBUG
+#define IP_NF_ASSERT(x)						\
+do {								\
+	if (!(x))						\
+		printk("IP_NF_ASSERT: %s:%s:%u\n",		\
+		       __FUNCTION__, __FILE__, __LINE__);	\
+} while(0)
+#else
+#define IP_NF_ASSERT(x)
+#endif
+#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
+
+static DECLARE_MUTEX(ipt_mutex);
+
+/* Must have mutex */
+#define ASSERT_READ_LOCK(x) IP_NF_ASSERT(down_trylock(&ipt_mutex) != 0)
+#define ASSERT_WRITE_LOCK(x) IP_NF_ASSERT(down_trylock(&ipt_mutex) != 0)
+#include <linux/netfilter_ipv4/lockhelp.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#if 0
+/* All the better to debug you with... */
+#define static
+#define inline
+#endif
+
+/*
+   We keep a set of rules for each CPU, so we can avoid write-locking
+   them in the softirq when updating the counters and therefore
+   only need to read-lock in the softirq; doing a write_lock_bh() in user
+   context stops packets coming through and allows user context to read
+   the counters or update the rules.
+
+   To be cache friendly on SMP, we arrange them like so:
+   [ n-entries ]
+   ... cache-align padding ...
+   [ n-entries ]
+
+   Hence the start of any table is given by get_table() below.  */
+
+/* The table itself */
+struct ipt_table_info
+{
+	/* Size per table */
+	unsigned int size;
+	/* Number of entries: FIXME. --RR */
+	unsigned int number;
+	/* Initial number of entries. Needed for module usage count */
+	unsigned int initial_entries;
+
+	/* Entry points and underflows */
+	unsigned int hook_entry[NF_IP_NUMHOOKS];
+	unsigned int underflow[NF_IP_NUMHOOKS];
+
+	/* ipt_entry tables: one per CPU */
+	char entries[0] ____cacheline_aligned;
+};
+
+static LIST_HEAD(ipt_target);
+static LIST_HEAD(ipt_match);
+static LIST_HEAD(ipt_tables);
+#define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0)
+
+#ifdef CONFIG_SMP
+#define TABLE_OFFSET(t,p) (SMP_ALIGN((t)->size)*(p))
+#else
+#define TABLE_OFFSET(t,p) 0
+#endif
+
+#if 0
+#define down(x) do { printk("DOWN:%u:" #x "\n", __LINE__); down(x); } while(0)
+#define down_interruptible(x) ({ int __r; printk("DOWNi:%u:" #x "\n", __LINE__); __r = down_interruptible(x); if (__r != 0) printk("ABORT-DOWNi:%u\n", __LINE__); __r; })
+#define up(x) do { printk("UP:%u:" #x "\n", __LINE__); up(x); } while(0)
+#endif
+
+/* Returns whether matches rule or not. */
+static inline int
+ip_packet_match(const struct iphdr *ip,
+		const char *indev,
+		const char *outdev,
+		const struct ipt_ip *ipinfo,
+		int isfrag)
+{
+	size_t i;
+	unsigned long ret;
+
+#define FWINV(bool,invflg) ((bool) ^ !!(ipinfo->invflags & invflg))
+
+	if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr,
+		  IPT_INV_SRCIP)
+	    || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr,
+		     IPT_INV_DSTIP)) {
+		dprintf("Source or dest mismatch.\n");
+
+		dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n",
+			NIPQUAD(ip->saddr),
+			NIPQUAD(ipinfo->smsk.s_addr),
+			NIPQUAD(ipinfo->src.s_addr),
+			ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : "");
+		dprintf("DST: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n",
+			NIPQUAD(ip->daddr),
+			NIPQUAD(ipinfo->dmsk.s_addr),
+			NIPQUAD(ipinfo->dst.s_addr),
+			ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : "");
+		return 0;
+	}
+
+	/* Look for ifname matches; this should unroll nicely. */
+	for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
+		ret |= (((const unsigned long *)indev)[i]
+			^ ((const unsigned long *)ipinfo->iniface)[i])
+			& ((const unsigned long *)ipinfo->iniface_mask)[i];
+	}
+
+	if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
+		dprintf("VIA in mismatch (%s vs %s).%s\n",
+			indev, ipinfo->iniface,
+			ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":"");
+		return 0;
+	}
+
+	for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
+		ret |= (((const unsigned long *)outdev)[i]
+			^ ((const unsigned long *)ipinfo->outiface)[i])
+			& ((const unsigned long *)ipinfo->outiface_mask)[i];
+	}
+
+	if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
+		dprintf("VIA out mismatch (%s vs %s).%s\n",
+			outdev, ipinfo->outiface,
+			ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":"");
+		return 0;
+	}
+
+	/* Check specific protocol */
+	if (ipinfo->proto
+	    && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) {
+		dprintf("Packet protocol %hi does not match %hi.%s\n",
+			ip->protocol, ipinfo->proto,
+			ipinfo->invflags&IPT_INV_PROTO ? " (INV)":"");
+		return 0;
+	}
+
+	/* If we have a fragment rule but the packet is not a fragment
+	 * then we return zero */
+	if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) {
+		dprintf("Fragment rule but not fragment.%s\n",
+			ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : "");
+		return 0;
+	}
+
+	return 1;
+}
+
+static inline int
+ip_checkentry(const struct ipt_ip *ip)
+{
+	if (ip->flags & ~IPT_F_MASK) {
+		duprintf("Unknown flag bits set: %08X\n",
+			 ip->flags & ~IPT_F_MASK);
+		return 0;
+	}
+	if (ip->invflags & ~IPT_INV_MASK) {
+		duprintf("Unknown invflag bits set: %08X\n",
+			 ip->invflags & ~IPT_INV_MASK);
+		return 0;
+	}
+	return 1;
+}
+
+static unsigned int
+ipt_error(struct sk_buff **pskb,
+	  const struct net_device *in,
+	  const struct net_device *out,
+	  unsigned int hooknum,
+	  const void *targinfo,
+	  void *userinfo)
+{
+	if (net_ratelimit())
+		printk("ip_tables: error: `%s'\n", (char *)targinfo);
+
+	return NF_DROP;
+}
+
+static inline
+int do_match(struct ipt_entry_match *m,
+	     const struct sk_buff *skb,
+	     const struct net_device *in,
+	     const struct net_device *out,
+	     int offset,
+	     int *hotdrop)
+{
+	/* Stop iteration if it doesn't match */
+	if (!m->u.kernel.match->match(skb, in, out, m->data, offset, hotdrop))
+		return 1;
+	else
+		return 0;
+}
+
+static inline struct ipt_entry *
+get_entry(void *base, unsigned int offset)
+{
+	return (struct ipt_entry *)(base + offset);
+}
+
+/* Returns one of the generic firewall policies, like NF_ACCEPT. */
+unsigned int
+ipt_do_table(struct sk_buff **pskb,
+	     unsigned int hook,
+	     const struct net_device *in,
+	     const struct net_device *out,
+	     struct ipt_table *table,
+	     void *userdata)
+{
+	static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
+	u_int16_t offset;
+	struct iphdr *ip;
+	u_int16_t datalen;
+	int hotdrop = 0;
+	/* Initializing verdict to NF_DROP keeps gcc happy. */
+	unsigned int verdict = NF_DROP;
+	const char *indev, *outdev;
+	void *table_base;
+	struct ipt_entry *e, *back;
+
+	/* Initialization */
+	ip = (*pskb)->nh.iph;
+	datalen = (*pskb)->len - ip->ihl * 4;
+	indev = in ? in->name : nulldevname;
+	outdev = out ? out->name : nulldevname;
+	/* We handle fragments by dealing with the first fragment as
+	 * if it was a normal packet.  All other fragments are treated
+	 * normally, except that they will NEVER match rules that ask
+	 * things we don't know, ie. tcp syn flag or ports).  If the
+	 * rule is also a fragment-specific rule, non-fragments won't
+	 * match it. */
+	offset = ntohs(ip->frag_off) & IP_OFFSET;
+
+	read_lock_bh(&table->lock);
+	IP_NF_ASSERT(table->valid_hooks & (1 << hook));
+	table_base = (void *)table->private->entries
+		+ TABLE_OFFSET(table->private, smp_processor_id());
+	e = get_entry(table_base, table->private->hook_entry[hook]);
+
+#ifdef CONFIG_NETFILTER_DEBUG
+	/* Check noone else using our table */
+	if (((struct ipt_entry *)table_base)->comefrom != 0xdead57ac
+	    && ((struct ipt_entry *)table_base)->comefrom != 0xeeeeeeec) {
+		printk("ASSERT: CPU #%u, %s comefrom(%p) = %X\n",
+		       smp_processor_id(),
+		       table->name,
+		       &((struct ipt_entry *)table_base)->comefrom,
+		       ((struct ipt_entry *)table_base)->comefrom);
+	}
+	((struct ipt_entry *)table_base)->comefrom = 0x57acc001;
+#endif
+
+	/* For return from builtin chain */
+	back = get_entry(table_base, table->private->underflow[hook]);
+
+	do {
+		IP_NF_ASSERT(e);
+		IP_NF_ASSERT(back);
+		(*pskb)->nfcache |= e->nfcache;
+		if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) {
+			struct ipt_entry_target *t;
+
+			if (IPT_MATCH_ITERATE(e, do_match,
+					      *pskb, in, out,
+					      offset, &hotdrop) != 0)
+				goto no_match;
+
+			ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
+
+			t = ipt_get_target(e);
+			IP_NF_ASSERT(t->u.kernel.target);
+			/* Standard target? */
+			if (!t->u.kernel.target->target) {
+				int v;
+
+				v = ((struct ipt_standard_target *)t)->verdict;
+				if (v < 0) {
+					/* Pop from stack? */
+					if (v != IPT_RETURN) {
+						verdict = (unsigned)(-v) - 1;
+						break;
+					}
+					e = back;
+					back = get_entry(table_base,
+							 back->comefrom);
+					continue;
+				}
+				if (table_base + v
+				    != (void *)e + e->next_offset) {
+					/* Save old back ptr in next entry */
+					struct ipt_entry *next
+						= (void *)e + e->next_offset;
+					next->comefrom
+						= (void *)back - table_base;
+					/* set back pointer to next entry */
+					back = next;
+				}
+
+				e = get_entry(table_base, v);
+			} else {
+				/* Targets which reenter must return
+                                   abs. verdicts */
+#ifdef CONFIG_NETFILTER_DEBUG
+				((struct ipt_entry *)table_base)->comefrom
+					= 0xeeeeeeec;
+#endif
+				verdict = t->u.kernel.target->target(pskb,
+								     in, out,
+								     hook,
+								     t->data,
+								     userdata);
+
+#ifdef CONFIG_NETFILTER_DEBUG
+				if (((struct ipt_entry *)table_base)->comefrom
+				    != 0xeeeeeeec
+				    && verdict == IPT_CONTINUE) {
+					printk("Target %s reentered!\n",
+					       t->u.kernel.target->name);
+					verdict = NF_DROP;
+				}
+				((struct ipt_entry *)table_base)->comefrom
+					= 0x57acc001;
+#endif
+				/* Target might have changed stuff. */
+				ip = (*pskb)->nh.iph;
+				datalen = (*pskb)->len - ip->ihl * 4;
+
+				if (verdict == IPT_CONTINUE)
+					e = (void *)e + e->next_offset;
+				else
+					/* Verdict */
+					break;
+			}
+		} else {
+
+		no_match:
+			e = (void *)e + e->next_offset;
+		}
+	} while (!hotdrop);
+
+#ifdef CONFIG_NETFILTER_DEBUG
+	((struct ipt_entry *)table_base)->comefrom = 0xdead57ac;
+#endif
+	read_unlock_bh(&table->lock);
+
+#ifdef DEBUG_ALLOW_ALL
+	return NF_ACCEPT;
+#else
+	if (hotdrop)
+		return NF_DROP;
+	else return verdict;
+#endif
+}
+
+/*
+ * These are weird, but module loading must not be done with mutex
+ * held (since they will register), and we have to have a single
+ * function to use try_then_request_module().
+ */
+
+/* Find table by name, grabs mutex & ref.  Returns ERR_PTR() on error. */
+static inline struct ipt_table *find_table_lock(const char *name)
+{
+	struct ipt_table *t;
+
+	if (down_interruptible(&ipt_mutex) != 0)
+		return ERR_PTR(-EINTR);
+
+	list_for_each_entry(t, &ipt_tables, list)
+		if (strcmp(t->name, name) == 0 && try_module_get(t->me))
+			return t;
+	up(&ipt_mutex);
+	return NULL;
+}
+
+/* Find match, grabs ref.  Returns ERR_PTR() on error. */
+static inline struct ipt_match *find_match(const char *name, u8 revision)
+{
+	struct ipt_match *m;
+	int err = 0;
+
+	if (down_interruptible(&ipt_mutex) != 0)
+		return ERR_PTR(-EINTR);
+
+	list_for_each_entry(m, &ipt_match, list) {
+		if (strcmp(m->name, name) == 0) {
+			if (m->revision == revision) {
+				if (try_module_get(m->me)) {
+					up(&ipt_mutex);
+					return m;
+				}
+			} else
+				err = -EPROTOTYPE; /* Found something. */
+		}
+	}
+	up(&ipt_mutex);
+	return ERR_PTR(err);
+}
+
+/* Find target, grabs ref.  Returns ERR_PTR() on error. */
+static inline struct ipt_target *find_target(const char *name, u8 revision)
+{
+	struct ipt_target *t;
+	int err = 0;
+
+	if (down_interruptible(&ipt_mutex) != 0)
+		return ERR_PTR(-EINTR);
+
+	list_for_each_entry(t, &ipt_target, list) {
+		if (strcmp(t->name, name) == 0) {
+			if (t->revision == revision) {
+				if (try_module_get(t->me)) {
+					up(&ipt_mutex);
+					return t;
+				}
+			} else
+				err = -EPROTOTYPE; /* Found something. */
+		}
+	}
+	up(&ipt_mutex);
+	return ERR_PTR(err);
+}
+
+struct ipt_target *ipt_find_target(const char *name, u8 revision)
+{
+	struct ipt_target *target;
+
+	target = try_then_request_module(find_target(name, revision),
+					 "ipt_%s", name);
+	if (IS_ERR(target) || !target)
+		return NULL;
+	return target;
+}
+
+static int match_revfn(const char *name, u8 revision, int *bestp)
+{
+	struct ipt_match *m;
+	int have_rev = 0;
+
+	list_for_each_entry(m, &ipt_match, list) {
+		if (strcmp(m->name, name) == 0) {
+			if (m->revision > *bestp)
+				*bestp = m->revision;
+			if (m->revision == revision)
+				have_rev = 1;
+		}
+	}
+	return have_rev;
+}
+
+static int target_revfn(const char *name, u8 revision, int *bestp)
+{
+	struct ipt_target *t;
+	int have_rev = 0;
+
+	list_for_each_entry(t, &ipt_target, list) {
+		if (strcmp(t->name, name) == 0) {
+			if (t->revision > *bestp)
+				*bestp = t->revision;
+			if (t->revision == revision)
+				have_rev = 1;
+		}
+	}
+	return have_rev;
+}
+
+/* Returns true or false (if no such extension at all) */
+static inline int find_revision(const char *name, u8 revision,
+				int (*revfn)(const char *, u8, int *),
+				int *err)
+{
+	int have_rev, best = -1;
+
+	if (down_interruptible(&ipt_mutex) != 0) {
+		*err = -EINTR;
+		return 1;
+	}
+	have_rev = revfn(name, revision, &best);
+	up(&ipt_mutex);
+
+	/* Nothing at all?  Return 0 to try loading module. */
+	if (best == -1) {
+		*err = -ENOENT;
+		return 0;
+	}
+
+	*err = best;
+	if (!have_rev)
+		*err = -EPROTONOSUPPORT;
+	return 1;
+}
+
+
+/* All zeroes == unconditional rule. */
+static inline int
+unconditional(const struct ipt_ip *ip)
+{
+	unsigned int i;
+
+	for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++)
+		if (((__u32 *)ip)[i])
+			return 0;
+
+	return 1;
+}
+
+/* Figures out from what hook each rule can be called: returns 0 if
+   there are loops.  Puts hook bitmask in comefrom. */
+static int
+mark_source_chains(struct ipt_table_info *newinfo, unsigned int valid_hooks)
+{
+	unsigned int hook;
+
+	/* No recursion; use packet counter to save back ptrs (reset
+	   to 0 as we leave), and comefrom to save source hook bitmask */
+	for (hook = 0; hook < NF_IP_NUMHOOKS; hook++) {
+		unsigned int pos = newinfo->hook_entry[hook];
+		struct ipt_entry *e
+			= (struct ipt_entry *)(newinfo->entries + pos);
+
+		if (!(valid_hooks & (1 << hook)))
+			continue;
+
+		/* Set initial back pointer. */
+		e->counters.pcnt = pos;
+
+		for (;;) {
+			struct ipt_standard_target *t
+				= (void *)ipt_get_target(e);
+
+			if (e->comefrom & (1 << NF_IP_NUMHOOKS)) {
+				printk("iptables: loop hook %u pos %u %08X.\n",
+				       hook, pos, e->comefrom);
+				return 0;
+			}
+			e->comefrom
+				|= ((1 << hook) | (1 << NF_IP_NUMHOOKS));
+
+			/* Unconditional return/END. */
+			if (e->target_offset == sizeof(struct ipt_entry)
+			    && (strcmp(t->target.u.user.name,
+				       IPT_STANDARD_TARGET) == 0)
+			    && t->verdict < 0
+			    && unconditional(&e->ip)) {
+				unsigned int oldpos, size;
+
+				/* Return: backtrack through the last
+				   big jump. */
+				do {
+					e->comefrom ^= (1<<NF_IP_NUMHOOKS);
+#ifdef DEBUG_IP_FIREWALL_USER
+					if (e->comefrom
+					    & (1 << NF_IP_NUMHOOKS)) {
+						duprintf("Back unset "
+							 "on hook %u "
+							 "rule %u\n",
+							 hook, pos);
+					}
+#endif
+					oldpos = pos;
+					pos = e->counters.pcnt;
+					e->counters.pcnt = 0;
+
+					/* We're at the start. */
+					if (pos == oldpos)
+						goto next;
+
+					e = (struct ipt_entry *)
+						(newinfo->entries + pos);
+				} while (oldpos == pos + e->next_offset);
+
+				/* Move along one */
+				size = e->next_offset;
+				e = (struct ipt_entry *)
+					(newinfo->entries + pos + size);
+				e->counters.pcnt = pos;
+				pos += size;
+			} else {
+				int newpos = t->verdict;
+
+				if (strcmp(t->target.u.user.name,
+					   IPT_STANDARD_TARGET) == 0
+				    && newpos >= 0) {
+					/* This a jump; chase it. */
+					duprintf("Jump rule %u -> %u\n",
+						 pos, newpos);
+				} else {
+					/* ... this is a fallthru */
+					newpos = pos + e->next_offset;
+				}
+				e = (struct ipt_entry *)
+					(newinfo->entries + newpos);
+				e->counters.pcnt = pos;
+				pos = newpos;
+			}
+		}
+		next:
+		duprintf("Finished chain %u\n", hook);
+	}
+	return 1;
+}
+
+static inline int
+cleanup_match(struct ipt_entry_match *m, unsigned int *i)
+{
+	if (i && (*i)-- == 0)
+		return 1;
+
+	if (m->u.kernel.match->destroy)
+		m->u.kernel.match->destroy(m->data,
+					   m->u.match_size - sizeof(*m));
+	module_put(m->u.kernel.match->me);
+	return 0;
+}
+
+static inline int
+standard_check(const struct ipt_entry_target *t,
+	       unsigned int max_offset)
+{
+	struct ipt_standard_target *targ = (void *)t;
+
+	/* Check standard info. */
+	if (t->u.target_size
+	    != IPT_ALIGN(sizeof(struct ipt_standard_target))) {
+		duprintf("standard_check: target size %u != %u\n",
+			 t->u.target_size,
+			 IPT_ALIGN(sizeof(struct ipt_standard_target)));
+		return 0;
+	}
+
+	if (targ->verdict >= 0
+	    && targ->verdict > max_offset - sizeof(struct ipt_entry)) {
+		duprintf("ipt_standard_check: bad verdict (%i)\n",
+			 targ->verdict);
+		return 0;
+	}
+
+	if (targ->verdict < -NF_MAX_VERDICT - 1) {
+		duprintf("ipt_standard_check: bad negative verdict (%i)\n",
+			 targ->verdict);
+		return 0;
+	}
+	return 1;
+}
+
+static inline int
+check_match(struct ipt_entry_match *m,
+	    const char *name,
+	    const struct ipt_ip *ip,
+	    unsigned int hookmask,
+	    unsigned int *i)
+{
+	struct ipt_match *match;
+
+	match = try_then_request_module(find_match(m->u.user.name,
+						   m->u.user.revision),
+					"ipt_%s", m->u.user.name);
+	if (IS_ERR(match) || !match) {
+		duprintf("check_match: `%s' not found\n", m->u.user.name);
+		return match ? PTR_ERR(match) : -ENOENT;
+	}
+	m->u.kernel.match = match;
+
+	if (m->u.kernel.match->checkentry
+	    && !m->u.kernel.match->checkentry(name, ip, m->data,
+					      m->u.match_size - sizeof(*m),
+					      hookmask)) {
+		module_put(m->u.kernel.match->me);
+		duprintf("ip_tables: check failed for `%s'.\n",
+			 m->u.kernel.match->name);
+		return -EINVAL;
+	}
+
+	(*i)++;
+	return 0;
+}
+
+static struct ipt_target ipt_standard_target;
+
+static inline int
+check_entry(struct ipt_entry *e, const char *name, unsigned int size,
+	    unsigned int *i)
+{
+	struct ipt_entry_target *t;
+	struct ipt_target *target;
+	int ret;
+	unsigned int j;
+
+	if (!ip_checkentry(&e->ip)) {
+		duprintf("ip_tables: ip check failed %p %s.\n", e, name);
+		return -EINVAL;
+	}
+
+	j = 0;
+	ret = IPT_MATCH_ITERATE(e, check_match, name, &e->ip, e->comefrom, &j);
+	if (ret != 0)
+		goto cleanup_matches;
+
+	t = ipt_get_target(e);
+	target = try_then_request_module(find_target(t->u.user.name,
+						     t->u.user.revision),
+					 "ipt_%s", t->u.user.name);
+	if (IS_ERR(target) || !target) {
+		duprintf("check_entry: `%s' not found\n", t->u.user.name);
+		ret = target ? PTR_ERR(target) : -ENOENT;
+		goto cleanup_matches;
+	}
+	t->u.kernel.target = target;
+
+	if (t->u.kernel.target == &ipt_standard_target) {
+		if (!standard_check(t, size)) {
+			ret = -EINVAL;
+			goto cleanup_matches;
+		}
+	} else if (t->u.kernel.target->checkentry
+		   && !t->u.kernel.target->checkentry(name, e, t->data,
+						      t->u.target_size
+						      - sizeof(*t),
+						      e->comefrom)) {
+		module_put(t->u.kernel.target->me);
+		duprintf("ip_tables: check failed for `%s'.\n",
+			 t->u.kernel.target->name);
+		ret = -EINVAL;
+		goto cleanup_matches;
+	}
+
+	(*i)++;
+	return 0;
+
+ cleanup_matches:
+	IPT_MATCH_ITERATE(e, cleanup_match, &j);
+	return ret;
+}
+
+static inline int
+check_entry_size_and_hooks(struct ipt_entry *e,
+			   struct ipt_table_info *newinfo,
+			   unsigned char *base,
+			   unsigned char *limit,
+			   const unsigned int *hook_entries,
+			   const unsigned int *underflows,
+			   unsigned int *i)
+{
+	unsigned int h;
+
+	if ((unsigned long)e % __alignof__(struct ipt_entry) != 0
+	    || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) {
+		duprintf("Bad offset %p\n", e);
+		return -EINVAL;
+	}
+
+	if (e->next_offset
+	    < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) {
+		duprintf("checking: element %p size %u\n",
+			 e, e->next_offset);
+		return -EINVAL;
+	}
+
+	/* Check hooks & underflows */
+	for (h = 0; h < NF_IP_NUMHOOKS; h++) {
+		if ((unsigned char *)e - base == hook_entries[h])
+			newinfo->hook_entry[h] = hook_entries[h];
+		if ((unsigned char *)e - base == underflows[h])
+			newinfo->underflow[h] = underflows[h];
+	}
+
+	/* FIXME: underflows must be unconditional, standard verdicts
+           < 0 (not IPT_RETURN). --RR */
+
+	/* Clear counters and comefrom */
+	e->counters = ((struct ipt_counters) { 0, 0 });
+	e->comefrom = 0;
+
+	(*i)++;
+	return 0;
+}
+
+static inline int
+cleanup_entry(struct ipt_entry *e, unsigned int *i)
+{
+	struct ipt_entry_target *t;
+
+	if (i && (*i)-- == 0)
+		return 1;
+
+	/* Cleanup all matches */
+	IPT_MATCH_ITERATE(e, cleanup_match, NULL);
+	t = ipt_get_target(e);
+	if (t->u.kernel.target->destroy)
+		t->u.kernel.target->destroy(t->data,
+					    t->u.target_size - sizeof(*t));
+	module_put(t->u.kernel.target->me);
+	return 0;
+}
+
+/* Checks and translates the user-supplied table segment (held in
+   newinfo) */
+static int
+translate_table(const char *name,
+		unsigned int valid_hooks,
+		struct ipt_table_info *newinfo,
+		unsigned int size,
+		unsigned int number,
+		const unsigned int *hook_entries,
+		const unsigned int *underflows)
+{
+	unsigned int i;
+	int ret;
+
+	newinfo->size = size;
+	newinfo->number = number;
+
+	/* Init all hooks to impossible value. */
+	for (i = 0; i < NF_IP_NUMHOOKS; i++) {
+		newinfo->hook_entry[i] = 0xFFFFFFFF;
+		newinfo->underflow[i] = 0xFFFFFFFF;
+	}
+
+	duprintf("translate_table: size %u\n", newinfo->size);
+	i = 0;
+	/* Walk through entries, checking offsets. */
+	ret = IPT_ENTRY_ITERATE(newinfo->entries, newinfo->size,
+				check_entry_size_and_hooks,
+				newinfo,
+				newinfo->entries,
+				newinfo->entries + size,
+				hook_entries, underflows, &i);
+	if (ret != 0)
+		return ret;
+
+	if (i != number) {
+		duprintf("translate_table: %u not %u entries\n",
+			 i, number);
+		return -EINVAL;
+	}
+
+	/* Check hooks all assigned */
+	for (i = 0; i < NF_IP_NUMHOOKS; i++) {
+		/* Only hooks which are valid */
+		if (!(valid_hooks & (1 << i)))
+			continue;
+		if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
+			duprintf("Invalid hook entry %u %u\n",
+				 i, hook_entries[i]);
+			return -EINVAL;
+		}
+		if (newinfo->underflow[i] == 0xFFFFFFFF) {
+			duprintf("Invalid underflow %u %u\n",
+				 i, underflows[i]);
+			return -EINVAL;
+		}
+	}
+
+	if (!mark_source_chains(newinfo, valid_hooks))
+		return -ELOOP;
+
+	/* Finally, each sanity check must pass */
+	i = 0;
+	ret = IPT_ENTRY_ITERATE(newinfo->entries, newinfo->size,
+				check_entry, name, size, &i);
+
+	if (ret != 0) {
+		IPT_ENTRY_ITERATE(newinfo->entries, newinfo->size,
+				  cleanup_entry, &i);
+		return ret;
+	}
+
+	/* And one copy for every other CPU */
+	for (i = 1; i < num_possible_cpus(); i++) {
+		memcpy(newinfo->entries + SMP_ALIGN(newinfo->size)*i,
+		       newinfo->entries,
+		       SMP_ALIGN(newinfo->size));
+	}
+
+	return ret;
+}
+
+static struct ipt_table_info *
+replace_table(struct ipt_table *table,
+	      unsigned int num_counters,
+	      struct ipt_table_info *newinfo,
+	      int *error)
+{
+	struct ipt_table_info *oldinfo;
+
+#ifdef CONFIG_NETFILTER_DEBUG
+	{
+		struct ipt_entry *table_base;
+		unsigned int i;
+
+		for (i = 0; i < num_possible_cpus(); i++) {
+			table_base =
+				(void *)newinfo->entries
+				+ TABLE_OFFSET(newinfo, i);
+
+			table_base->comefrom = 0xdead57ac;
+		}
+	}
+#endif
+
+	/* Do the substitution. */
+	write_lock_bh(&table->lock);
+	/* Check inside lock: is the old number correct? */
+	if (num_counters != table->private->number) {
+		duprintf("num_counters != table->private->number (%u/%u)\n",
+			 num_counters, table->private->number);
+		write_unlock_bh(&table->lock);
+		*error = -EAGAIN;
+		return NULL;
+	}
+	oldinfo = table->private;
+	table->private = newinfo;
+	newinfo->initial_entries = oldinfo->initial_entries;
+	write_unlock_bh(&table->lock);
+
+	return oldinfo;
+}
+
+/* Gets counters. */
+static inline int
+add_entry_to_counter(const struct ipt_entry *e,
+		     struct ipt_counters total[],
+		     unsigned int *i)
+{
+	ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt);
+
+	(*i)++;
+	return 0;
+}
+
+static void
+get_counters(const struct ipt_table_info *t,
+	     struct ipt_counters counters[])
+{
+	unsigned int cpu;
+	unsigned int i;
+
+	for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
+		i = 0;
+		IPT_ENTRY_ITERATE(t->entries + TABLE_OFFSET(t, cpu),
+				  t->size,
+				  add_entry_to_counter,
+				  counters,
+				  &i);
+	}
+}
+
+static int
+copy_entries_to_user(unsigned int total_size,
+		     struct ipt_table *table,
+		     void __user *userptr)
+{
+	unsigned int off, num, countersize;
+	struct ipt_entry *e;
+	struct ipt_counters *counters;
+	int ret = 0;
+
+	/* We need atomic snapshot of counters: rest doesn't change
+	   (other than comefrom, which userspace doesn't care
+	   about). */
+	countersize = sizeof(struct ipt_counters) * table->private->number;
+	counters = vmalloc(countersize);
+
+	if (counters == NULL)
+		return -ENOMEM;
+
+	/* First, sum counters... */
+	memset(counters, 0, countersize);
+	write_lock_bh(&table->lock);
+	get_counters(table->private, counters);
+	write_unlock_bh(&table->lock);
+
+	/* ... then copy entire thing from CPU 0... */
+	if (copy_to_user(userptr, table->private->entries, total_size) != 0) {
+		ret = -EFAULT;
+		goto free_counters;
+	}
+
+	/* FIXME: use iterator macros --RR */
+	/* ... then go back and fix counters and names */
+	for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
+		unsigned int i;
+		struct ipt_entry_match *m;
+		struct ipt_entry_target *t;
+
+		e = (struct ipt_entry *)(table->private->entries + off);
+		if (copy_to_user(userptr + off
+				 + offsetof(struct ipt_entry, counters),
+				 &counters[num],
+				 sizeof(counters[num])) != 0) {
+			ret = -EFAULT;
+			goto free_counters;
+		}
+
+		for (i = sizeof(struct ipt_entry);
+		     i < e->target_offset;
+		     i += m->u.match_size) {
+			m = (void *)e + i;
+
+			if (copy_to_user(userptr + off + i
+					 + offsetof(struct ipt_entry_match,
+						    u.user.name),
+					 m->u.kernel.match->name,
+					 strlen(m->u.kernel.match->name)+1)
+			    != 0) {
+				ret = -EFAULT;
+				goto free_counters;
+			}
+		}
+
+		t = ipt_get_target(e);
+		if (copy_to_user(userptr + off + e->target_offset
+				 + offsetof(struct ipt_entry_target,
+					    u.user.name),
+				 t->u.kernel.target->name,
+				 strlen(t->u.kernel.target->name)+1) != 0) {
+			ret = -EFAULT;
+			goto free_counters;
+		}
+	}
+
+ free_counters:
+	vfree(counters);
+	return ret;
+}
+
+static int
+get_entries(const struct ipt_get_entries *entries,
+	    struct ipt_get_entries __user *uptr)
+{
+	int ret;
+	struct ipt_table *t;
+
+	t = find_table_lock(entries->name);
+	if (t && !IS_ERR(t)) {
+		duprintf("t->private->number = %u\n",
+			 t->private->number);
+		if (entries->size == t->private->size)
+			ret = copy_entries_to_user(t->private->size,
+						   t, uptr->entrytable);
+		else {
+			duprintf("get_entries: I've got %u not %u!\n",
+				 t->private->size,
+				 entries->size);
+			ret = -EINVAL;
+		}
+		module_put(t->me);
+		up(&ipt_mutex);
+	} else
+		ret = t ? PTR_ERR(t) : -ENOENT;
+
+	return ret;
+}
+
+static int
+do_replace(void __user *user, unsigned int len)
+{
+	int ret;
+	struct ipt_replace tmp;
+	struct ipt_table *t;
+	struct ipt_table_info *newinfo, *oldinfo;
+	struct ipt_counters *counters;
+
+	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+		return -EFAULT;
+
+	/* Hack: Causes ipchains to give correct error msg --RR */
+	if (len != sizeof(tmp) + tmp.size)
+		return -ENOPROTOOPT;
+
+	/* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
+	if ((SMP_ALIGN(tmp.size) >> PAGE_SHIFT) + 2 > num_physpages)
+		return -ENOMEM;
+
+	newinfo = vmalloc(sizeof(struct ipt_table_info)
+			  + SMP_ALIGN(tmp.size) * num_possible_cpus());
+	if (!newinfo)
+		return -ENOMEM;
+
+	if (copy_from_user(newinfo->entries, user + sizeof(tmp),
+			   tmp.size) != 0) {
+		ret = -EFAULT;
+		goto free_newinfo;
+	}
+
+	counters = vmalloc(tmp.num_counters * sizeof(struct ipt_counters));
+	if (!counters) {
+		ret = -ENOMEM;
+		goto free_newinfo;
+	}
+	memset(counters, 0, tmp.num_counters * sizeof(struct ipt_counters));
+
+	ret = translate_table(tmp.name, tmp.valid_hooks,
+			      newinfo, tmp.size, tmp.num_entries,
+			      tmp.hook_entry, tmp.underflow);
+	if (ret != 0)
+		goto free_newinfo_counters;
+
+	duprintf("ip_tables: Translated table\n");
+
+	t = try_then_request_module(find_table_lock(tmp.name),
+				    "iptable_%s", tmp.name);
+	if (!t || IS_ERR(t)) {
+		ret = t ? PTR_ERR(t) : -ENOENT;
+		goto free_newinfo_counters_untrans;
+	}
+
+	/* You lied! */
+	if (tmp.valid_hooks != t->valid_hooks) {
+		duprintf("Valid hook crap: %08X vs %08X\n",
+			 tmp.valid_hooks, t->valid_hooks);
+		ret = -EINVAL;
+		goto put_module;
+	}
+
+	oldinfo = replace_table(t, tmp.num_counters, newinfo, &ret);
+	if (!oldinfo)
+		goto put_module;
+
+	/* Update module usage count based on number of rules */
+	duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
+		oldinfo->number, oldinfo->initial_entries, newinfo->number);
+	if ((oldinfo->number > oldinfo->initial_entries) || 
+	    (newinfo->number <= oldinfo->initial_entries)) 
+		module_put(t->me);
+	if ((oldinfo->number > oldinfo->initial_entries) &&
+	    (newinfo->number <= oldinfo->initial_entries))
+		module_put(t->me);
+
+	/* Get the old counters. */
+	get_counters(oldinfo, counters);
+	/* Decrease module usage counts and free resource */
+	IPT_ENTRY_ITERATE(oldinfo->entries, oldinfo->size, cleanup_entry,NULL);
+	vfree(oldinfo);
+	if (copy_to_user(tmp.counters, counters,
+			 sizeof(struct ipt_counters) * tmp.num_counters) != 0)
+		ret = -EFAULT;
+	vfree(counters);
+	up(&ipt_mutex);
+	return ret;
+
+ put_module:
+	module_put(t->me);
+	up(&ipt_mutex);
+ free_newinfo_counters_untrans:
+	IPT_ENTRY_ITERATE(newinfo->entries, newinfo->size, cleanup_entry,NULL);
+ free_newinfo_counters:
+	vfree(counters);
+ free_newinfo:
+	vfree(newinfo);
+	return ret;
+}
+
+/* We're lazy, and add to the first CPU; overflow works its fey magic
+ * and everything is OK. */
+static inline int
+add_counter_to_entry(struct ipt_entry *e,
+		     const struct ipt_counters addme[],
+		     unsigned int *i)
+{
+#if 0
+	duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n",
+		 *i,
+		 (long unsigned int)e->counters.pcnt,
+		 (long unsigned int)e->counters.bcnt,
+		 (long unsigned int)addme[*i].pcnt,
+		 (long unsigned int)addme[*i].bcnt);
+#endif
+
+	ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
+
+	(*i)++;
+	return 0;
+}
+
+static int
+do_add_counters(void __user *user, unsigned int len)
+{
+	unsigned int i;
+	struct ipt_counters_info tmp, *paddc;
+	struct ipt_table *t;
+	int ret = 0;
+
+	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+		return -EFAULT;
+
+	if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct ipt_counters))
+		return -EINVAL;
+
+	paddc = vmalloc(len);
+	if (!paddc)
+		return -ENOMEM;
+
+	if (copy_from_user(paddc, user, len) != 0) {
+		ret = -EFAULT;
+		goto free;
+	}
+
+	t = find_table_lock(tmp.name);
+	if (!t || IS_ERR(t)) {
+		ret = t ? PTR_ERR(t) : -ENOENT;
+		goto free;
+	}
+
+	write_lock_bh(&t->lock);
+	if (t->private->number != paddc->num_counters) {
+		ret = -EINVAL;
+		goto unlock_up_free;
+	}
+
+	i = 0;
+	IPT_ENTRY_ITERATE(t->private->entries,
+			  t->private->size,
+			  add_counter_to_entry,
+			  paddc->counters,
+			  &i);
+ unlock_up_free:
+	write_unlock_bh(&t->lock);
+	up(&ipt_mutex);
+	module_put(t->me);
+ free:
+	vfree(paddc);
+
+	return ret;
+}
+
+static int
+do_ipt_set_ctl(struct sock *sk,	int cmd, void __user *user, unsigned int len)
+{
+	int ret;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	switch (cmd) {
+	case IPT_SO_SET_REPLACE:
+		ret = do_replace(user, len);
+		break;
+
+	case IPT_SO_SET_ADD_COUNTERS:
+		ret = do_add_counters(user, len);
+		break;
+
+	default:
+		duprintf("do_ipt_set_ctl:  unknown request %i\n", cmd);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int
+do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
+{
+	int ret;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	switch (cmd) {
+	case IPT_SO_GET_INFO: {
+		char name[IPT_TABLE_MAXNAMELEN];
+		struct ipt_table *t;
+
+		if (*len != sizeof(struct ipt_getinfo)) {
+			duprintf("length %u != %u\n", *len,
+				 sizeof(struct ipt_getinfo));
+			ret = -EINVAL;
+			break;
+		}
+
+		if (copy_from_user(name, user, sizeof(name)) != 0) {
+			ret = -EFAULT;
+			break;
+		}
+		name[IPT_TABLE_MAXNAMELEN-1] = '\0';
+
+		t = try_then_request_module(find_table_lock(name),
+					    "iptable_%s", name);
+		if (t && !IS_ERR(t)) {
+			struct ipt_getinfo info;
+
+			info.valid_hooks = t->valid_hooks;
+			memcpy(info.hook_entry, t->private->hook_entry,
+			       sizeof(info.hook_entry));
+			memcpy(info.underflow, t->private->underflow,
+			       sizeof(info.underflow));
+			info.num_entries = t->private->number;
+			info.size = t->private->size;
+			memcpy(info.name, name, sizeof(info.name));
+
+			if (copy_to_user(user, &info, *len) != 0)
+				ret = -EFAULT;
+			else
+				ret = 0;
+			up(&ipt_mutex);
+			module_put(t->me);
+		} else
+			ret = t ? PTR_ERR(t) : -ENOENT;
+	}
+	break;
+
+	case IPT_SO_GET_ENTRIES: {
+		struct ipt_get_entries get;
+
+		if (*len < sizeof(get)) {
+			duprintf("get_entries: %u < %u\n", *len, sizeof(get));
+			ret = -EINVAL;
+		} else if (copy_from_user(&get, user, sizeof(get)) != 0) {
+			ret = -EFAULT;
+		} else if (*len != sizeof(struct ipt_get_entries) + get.size) {
+			duprintf("get_entries: %u != %u\n", *len,
+				 sizeof(struct ipt_get_entries) + get.size);
+			ret = -EINVAL;
+		} else
+			ret = get_entries(&get, user);
+		break;
+	}
+
+	case IPT_SO_GET_REVISION_MATCH:
+	case IPT_SO_GET_REVISION_TARGET: {
+		struct ipt_get_revision rev;
+		int (*revfn)(const char *, u8, int *);
+
+		if (*len != sizeof(rev)) {
+			ret = -EINVAL;
+			break;
+		}
+		if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
+			ret = -EFAULT;
+			break;
+		}
+
+		if (cmd == IPT_SO_GET_REVISION_TARGET)
+			revfn = target_revfn;
+		else
+			revfn = match_revfn;
+
+		try_then_request_module(find_revision(rev.name, rev.revision,
+						      revfn, &ret),
+					"ipt_%s", rev.name);
+		break;
+	}
+
+	default:
+		duprintf("do_ipt_get_ctl: unknown request %i\n", cmd);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+/* Registration hooks for targets. */
+int
+ipt_register_target(struct ipt_target *target)
+{
+	int ret;
+
+	ret = down_interruptible(&ipt_mutex);
+	if (ret != 0)
+		return ret;
+	list_add(&target->list, &ipt_target);
+	up(&ipt_mutex);
+	return ret;
+}
+
+void
+ipt_unregister_target(struct ipt_target *target)
+{
+	down(&ipt_mutex);
+	LIST_DELETE(&ipt_target, target);
+	up(&ipt_mutex);
+}
+
+int
+ipt_register_match(struct ipt_match *match)
+{
+	int ret;
+
+	ret = down_interruptible(&ipt_mutex);
+	if (ret != 0)
+		return ret;
+
+	list_add(&match->list, &ipt_match);
+	up(&ipt_mutex);
+
+	return ret;
+}
+
+void
+ipt_unregister_match(struct ipt_match *match)
+{
+	down(&ipt_mutex);
+	LIST_DELETE(&ipt_match, match);
+	up(&ipt_mutex);
+}
+
+int ipt_register_table(struct ipt_table *table, const struct ipt_replace *repl)
+{
+	int ret;
+	struct ipt_table_info *newinfo;
+	static struct ipt_table_info bootstrap
+		= { 0, 0, 0, { 0 }, { 0 }, { } };
+
+	newinfo = vmalloc(sizeof(struct ipt_table_info)
+			  + SMP_ALIGN(repl->size) * num_possible_cpus());
+	if (!newinfo)
+		return -ENOMEM;
+
+	memcpy(newinfo->entries, repl->entries, repl->size);
+
+	ret = translate_table(table->name, table->valid_hooks,
+			      newinfo, repl->size,
+			      repl->num_entries,
+			      repl->hook_entry,
+			      repl->underflow);
+	if (ret != 0) {
+		vfree(newinfo);
+		return ret;
+	}
+
+	ret = down_interruptible(&ipt_mutex);
+	if (ret != 0) {
+		vfree(newinfo);
+		return ret;
+	}
+
+	/* Don't autoload: we'd eat our tail... */
+	if (list_named_find(&ipt_tables, table->name)) {
+		ret = -EEXIST;
+		goto free_unlock;
+	}
+
+	/* Simplifies replace_table code. */
+	table->private = &bootstrap;
+	if (!replace_table(table, 0, newinfo, &ret))
+		goto free_unlock;
+
+	duprintf("table->private->number = %u\n",
+		 table->private->number);
+	
+	/* save number of initial entries */
+	table->private->initial_entries = table->private->number;
+
+	rwlock_init(&table->lock);
+	list_prepend(&ipt_tables, table);
+
+ unlock:
+	up(&ipt_mutex);
+	return ret;
+
+ free_unlock:
+	vfree(newinfo);
+	goto unlock;
+}
+
+void ipt_unregister_table(struct ipt_table *table)
+{
+	down(&ipt_mutex);
+	LIST_DELETE(&ipt_tables, table);
+	up(&ipt_mutex);
+
+	/* Decrease module usage counts and free resources */
+	IPT_ENTRY_ITERATE(table->private->entries, table->private->size,
+			  cleanup_entry, NULL);
+	vfree(table->private);
+}
+
+/* Returns 1 if the port is matched by the range, 0 otherwise */
+static inline int
+port_match(u_int16_t min, u_int16_t max, u_int16_t port, int invert)
+{
+	int ret;
+
+	ret = (port >= min && port <= max) ^ invert;
+	return ret;
+}
+
+static int
+tcp_find_option(u_int8_t option,
+		const struct sk_buff *skb,
+		unsigned int optlen,
+		int invert,
+		int *hotdrop)
+{
+	/* tcp.doff is only 4 bits, ie. max 15 * 4 bytes */
+	u_int8_t _opt[60 - sizeof(struct tcphdr)], *op;
+	unsigned int i;
+
+	duprintf("tcp_match: finding option\n");
+
+	if (!optlen)
+		return invert;
+
+	/* If we don't have the whole header, drop packet. */
+	op = skb_header_pointer(skb,
+				skb->nh.iph->ihl*4 + sizeof(struct tcphdr),
+				optlen, _opt);
+	if (op == NULL) {
+		*hotdrop = 1;
+		return 0;
+	}
+
+	for (i = 0; i < optlen; ) {
+		if (op[i] == option) return !invert;
+		if (op[i] < 2) i++;
+		else i += op[i+1]?:1;
+	}
+
+	return invert;
+}
+
+static int
+tcp_match(const struct sk_buff *skb,
+	  const struct net_device *in,
+	  const struct net_device *out,
+	  const void *matchinfo,
+	  int offset,
+	  int *hotdrop)
+{
+	struct tcphdr _tcph, *th;
+	const struct ipt_tcp *tcpinfo = matchinfo;
+
+	if (offset) {
+		/* To quote Alan:
+
+		   Don't allow a fragment of TCP 8 bytes in. Nobody normal
+		   causes this. Its a cracker trying to break in by doing a
+		   flag overwrite to pass the direction checks.
+		*/
+		if (offset == 1) {
+			duprintf("Dropping evil TCP offset=1 frag.\n");
+			*hotdrop = 1;
+		}
+		/* Must not be a fragment. */
+		return 0;
+	}
+
+#define FWINVTCP(bool,invflg) ((bool) ^ !!(tcpinfo->invflags & invflg))
+
+	th = skb_header_pointer(skb, skb->nh.iph->ihl*4,
+				sizeof(_tcph), &_tcph);
+	if (th == NULL) {
+		/* We've been asked to examine this packet, and we
+		   can't.  Hence, no choice but to drop. */
+		duprintf("Dropping evil TCP offset=0 tinygram.\n");
+		*hotdrop = 1;
+		return 0;
+	}
+
+	if (!port_match(tcpinfo->spts[0], tcpinfo->spts[1],
+			ntohs(th->source),
+			!!(tcpinfo->invflags & IPT_TCP_INV_SRCPT)))
+		return 0;
+	if (!port_match(tcpinfo->dpts[0], tcpinfo->dpts[1],
+			ntohs(th->dest),
+			!!(tcpinfo->invflags & IPT_TCP_INV_DSTPT)))
+		return 0;
+	if (!FWINVTCP((((unsigned char *)th)[13] & tcpinfo->flg_mask)
+		      == tcpinfo->flg_cmp,
+		      IPT_TCP_INV_FLAGS))
+		return 0;
+	if (tcpinfo->option) {
+		if (th->doff * 4 < sizeof(_tcph)) {
+			*hotdrop = 1;
+			return 0;
+		}
+		if (!tcp_find_option(tcpinfo->option, skb,
+				     th->doff*4 - sizeof(_tcph),
+				     tcpinfo->invflags & IPT_TCP_INV_OPTION,
+				     hotdrop))
+			return 0;
+	}
+	return 1;
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+tcp_checkentry(const char *tablename,
+	       const struct ipt_ip *ip,
+	       void *matchinfo,
+	       unsigned int matchsize,
+	       unsigned int hook_mask)
+{
+	const struct ipt_tcp *tcpinfo = matchinfo;
+
+	/* Must specify proto == TCP, and no unknown invflags */
+	return ip->proto == IPPROTO_TCP
+		&& !(ip->invflags & IPT_INV_PROTO)
+		&& matchsize == IPT_ALIGN(sizeof(struct ipt_tcp))
+		&& !(tcpinfo->invflags & ~IPT_TCP_INV_MASK);
+}
+
+static int
+udp_match(const struct sk_buff *skb,
+	  const struct net_device *in,
+	  const struct net_device *out,
+	  const void *matchinfo,
+	  int offset,
+	  int *hotdrop)
+{
+	struct udphdr _udph, *uh;
+	const struct ipt_udp *udpinfo = matchinfo;
+
+	/* Must not be a fragment. */
+	if (offset)
+		return 0;
+
+	uh = skb_header_pointer(skb, skb->nh.iph->ihl*4,
+				sizeof(_udph), &_udph);
+	if (uh == NULL) {
+		/* We've been asked to examine this packet, and we
+		   can't.  Hence, no choice but to drop. */
+		duprintf("Dropping evil UDP tinygram.\n");
+		*hotdrop = 1;
+		return 0;
+	}
+
+	return port_match(udpinfo->spts[0], udpinfo->spts[1],
+			  ntohs(uh->source),
+			  !!(udpinfo->invflags & IPT_UDP_INV_SRCPT))
+		&& port_match(udpinfo->dpts[0], udpinfo->dpts[1],
+			      ntohs(uh->dest),
+			      !!(udpinfo->invflags & IPT_UDP_INV_DSTPT));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+udp_checkentry(const char *tablename,
+	       const struct ipt_ip *ip,
+	       void *matchinfo,
+	       unsigned int matchinfosize,
+	       unsigned int hook_mask)
+{
+	const struct ipt_udp *udpinfo = matchinfo;
+
+	/* Must specify proto == UDP, and no unknown invflags */
+	if (ip->proto != IPPROTO_UDP || (ip->invflags & IPT_INV_PROTO)) {
+		duprintf("ipt_udp: Protocol %u != %u\n", ip->proto,
+			 IPPROTO_UDP);
+		return 0;
+	}
+	if (matchinfosize != IPT_ALIGN(sizeof(struct ipt_udp))) {
+		duprintf("ipt_udp: matchsize %u != %u\n",
+			 matchinfosize, IPT_ALIGN(sizeof(struct ipt_udp)));
+		return 0;
+	}
+	if (udpinfo->invflags & ~IPT_UDP_INV_MASK) {
+		duprintf("ipt_udp: unknown flags %X\n",
+			 udpinfo->invflags);
+		return 0;
+	}
+
+	return 1;
+}
+
+/* Returns 1 if the type and code is matched by the range, 0 otherwise */
+static inline int
+icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
+		     u_int8_t type, u_int8_t code,
+		     int invert)
+{
+	return ((test_type == 0xFF) || (type == test_type && code >= min_code && code <= max_code))
+		^ invert;
+}
+
+static int
+icmp_match(const struct sk_buff *skb,
+	   const struct net_device *in,
+	   const struct net_device *out,
+	   const void *matchinfo,
+	   int offset,
+	   int *hotdrop)
+{
+	struct icmphdr _icmph, *ic;
+	const struct ipt_icmp *icmpinfo = matchinfo;
+
+	/* Must not be a fragment. */
+	if (offset)
+		return 0;
+
+	ic = skb_header_pointer(skb, skb->nh.iph->ihl*4,
+				sizeof(_icmph), &_icmph);
+	if (ic == NULL) {
+		/* We've been asked to examine this packet, and we
+		 * can't.  Hence, no choice but to drop.
+		 */
+		duprintf("Dropping evil ICMP tinygram.\n");
+		*hotdrop = 1;
+		return 0;
+	}
+
+	return icmp_type_code_match(icmpinfo->type,
+				    icmpinfo->code[0],
+				    icmpinfo->code[1],
+				    ic->type, ic->code,
+				    !!(icmpinfo->invflags&IPT_ICMP_INV));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+icmp_checkentry(const char *tablename,
+	   const struct ipt_ip *ip,
+	   void *matchinfo,
+	   unsigned int matchsize,
+	   unsigned int hook_mask)
+{
+	const struct ipt_icmp *icmpinfo = matchinfo;
+
+	/* Must specify proto == ICMP, and no unknown invflags */
+	return ip->proto == IPPROTO_ICMP
+		&& !(ip->invflags & IPT_INV_PROTO)
+		&& matchsize == IPT_ALIGN(sizeof(struct ipt_icmp))
+		&& !(icmpinfo->invflags & ~IPT_ICMP_INV);
+}
+
+/* The built-in targets: standard (NULL) and error. */
+static struct ipt_target ipt_standard_target = {
+	.name		= IPT_STANDARD_TARGET,
+};
+
+static struct ipt_target ipt_error_target = {
+	.name		= IPT_ERROR_TARGET,
+	.target		= ipt_error,
+};
+
+static struct nf_sockopt_ops ipt_sockopts = {
+	.pf		= PF_INET,
+	.set_optmin	= IPT_BASE_CTL,
+	.set_optmax	= IPT_SO_SET_MAX+1,
+	.set		= do_ipt_set_ctl,
+	.get_optmin	= IPT_BASE_CTL,
+	.get_optmax	= IPT_SO_GET_MAX+1,
+	.get		= do_ipt_get_ctl,
+};
+
+static struct ipt_match tcp_matchstruct = {
+	.name		= "tcp",
+	.match		= &tcp_match,
+	.checkentry	= &tcp_checkentry,
+};
+
+static struct ipt_match udp_matchstruct = {
+	.name		= "udp",
+	.match		= &udp_match,
+	.checkentry	= &udp_checkentry,
+};
+
+static struct ipt_match icmp_matchstruct = {
+	.name		= "icmp",
+	.match		= &icmp_match,
+	.checkentry	= &icmp_checkentry,
+};
+
+#ifdef CONFIG_PROC_FS
+static inline int print_name(const char *i,
+			     off_t start_offset, char *buffer, int length,
+			     off_t *pos, unsigned int *count)
+{
+	if ((*count)++ >= start_offset) {
+		unsigned int namelen;
+
+		namelen = sprintf(buffer + *pos, "%s\n",
+				  i + sizeof(struct list_head));
+		if (*pos + namelen > length) {
+			/* Stop iterating */
+			return 1;
+		}
+		*pos += namelen;
+	}
+	return 0;
+}
+
+static inline int print_target(const struct ipt_target *t,
+                               off_t start_offset, char *buffer, int length,
+                               off_t *pos, unsigned int *count)
+{
+	if (t == &ipt_standard_target || t == &ipt_error_target)
+		return 0;
+	return print_name((char *)t, start_offset, buffer, length, pos, count);
+}
+
+static int ipt_get_tables(char *buffer, char **start, off_t offset, int length)
+{
+	off_t pos = 0;
+	unsigned int count = 0;
+
+	if (down_interruptible(&ipt_mutex) != 0)
+		return 0;
+
+	LIST_FIND(&ipt_tables, print_name, void *,
+		  offset, buffer, length, &pos, &count);
+
+	up(&ipt_mutex);
+
+	/* `start' hack - see fs/proc/generic.c line ~105 */
+	*start=(char *)((unsigned long)count-offset);
+	return pos;
+}
+
+static int ipt_get_targets(char *buffer, char **start, off_t offset, int length)
+{
+	off_t pos = 0;
+	unsigned int count = 0;
+
+	if (down_interruptible(&ipt_mutex) != 0)
+		return 0;
+
+	LIST_FIND(&ipt_target, print_target, struct ipt_target *,
+		  offset, buffer, length, &pos, &count);
+	
+	up(&ipt_mutex);
+
+	*start = (char *)((unsigned long)count - offset);
+	return pos;
+}
+
+static int ipt_get_matches(char *buffer, char **start, off_t offset, int length)
+{
+	off_t pos = 0;
+	unsigned int count = 0;
+
+	if (down_interruptible(&ipt_mutex) != 0)
+		return 0;
+	
+	LIST_FIND(&ipt_match, print_name, void *,
+		  offset, buffer, length, &pos, &count);
+
+	up(&ipt_mutex);
+
+	*start = (char *)((unsigned long)count - offset);
+	return pos;
+}
+
+static struct { char *name; get_info_t *get_info; } ipt_proc_entry[] =
+{ { "ip_tables_names", ipt_get_tables },
+  { "ip_tables_targets", ipt_get_targets },
+  { "ip_tables_matches", ipt_get_matches },
+  { NULL, NULL} };
+#endif /*CONFIG_PROC_FS*/
+
+static int __init init(void)
+{
+	int ret;
+
+	/* Noone else will be downing sem now, so we won't sleep */
+	down(&ipt_mutex);
+	list_append(&ipt_target, &ipt_standard_target);
+	list_append(&ipt_target, &ipt_error_target);
+	list_append(&ipt_match, &tcp_matchstruct);
+	list_append(&ipt_match, &udp_matchstruct);
+	list_append(&ipt_match, &icmp_matchstruct);
+	up(&ipt_mutex);
+
+	/* Register setsockopt */
+	ret = nf_register_sockopt(&ipt_sockopts);
+	if (ret < 0) {
+		duprintf("Unable to register sockopts.\n");
+		return ret;
+	}
+
+#ifdef CONFIG_PROC_FS
+	{
+	struct proc_dir_entry *proc;
+	int i;
+
+	for (i = 0; ipt_proc_entry[i].name; i++) {
+		proc = proc_net_create(ipt_proc_entry[i].name, 0,
+				       ipt_proc_entry[i].get_info);
+		if (!proc) {
+			while (--i >= 0)
+				proc_net_remove(ipt_proc_entry[i].name);
+			nf_unregister_sockopt(&ipt_sockopts);
+			return -ENOMEM;
+		}
+		proc->owner = THIS_MODULE;
+	}
+	}
+#endif
+
+	printk("ip_tables: (C) 2000-2002 Netfilter core team\n");
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	nf_unregister_sockopt(&ipt_sockopts);
+#ifdef CONFIG_PROC_FS
+	{
+	int i;
+	for (i = 0; ipt_proc_entry[i].name; i++)
+		proc_net_remove(ipt_proc_entry[i].name);
+	}
+#endif
+}
+
+EXPORT_SYMBOL(ipt_register_table);
+EXPORT_SYMBOL(ipt_unregister_table);
+EXPORT_SYMBOL(ipt_register_match);
+EXPORT_SYMBOL(ipt_unregister_match);
+EXPORT_SYMBOL(ipt_do_table);
+EXPORT_SYMBOL(ipt_register_target);
+EXPORT_SYMBOL(ipt_unregister_target);
+EXPORT_SYMBOL(ipt_find_target);
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_CLASSIFY.c b/net/ipv4/netfilter/ipt_CLASSIFY.c
new file mode 100644
index 000000000000..9842e6e23184
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_CLASSIFY.c
@@ -0,0 +1,92 @@
+/*
+ * This is a module which is used for setting the skb->priority field
+ * of an skb for qdisc classification.
+ */
+
+/* (C) 2001-2002 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_CLASSIFY.h>
+
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("iptables qdisc classification target module");
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	const struct ipt_classify_target_info *clinfo = targinfo;
+
+	if((*pskb)->priority != clinfo->priority) {
+		(*pskb)->priority = clinfo->priority;
+		(*pskb)->nfcache |= NFC_ALTERED;
+	}
+
+	return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+           const struct ipt_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
+           unsigned int hook_mask)
+{
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_classify_target_info))){
+		printk(KERN_ERR "CLASSIFY: invalid size (%u != %Zu).\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_classify_target_info)));
+		return 0;
+	}
+	
+	if (hook_mask & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) |
+	                  (1 << NF_IP_POST_ROUTING))) {
+		printk(KERN_ERR "CLASSIFY: only valid in LOCAL_OUT, FORWARD "
+		                "and POST_ROUTING.\n");
+		return 0;
+	}
+
+	if (strcmp(tablename, "mangle") != 0) {
+		printk(KERN_ERR "CLASSIFY: can only be called from "
+		                "\"mangle\" table, not \"%s\".\n",
+		                tablename);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_classify_reg = { 
+	.name 		= "CLASSIFY", 
+	.target 	= target,
+	.checkentry	= checkentry,
+	.me 		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&ipt_classify_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_classify_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
new file mode 100644
index 000000000000..0f12e3a3dc73
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -0,0 +1,761 @@
+/* Cluster IP hashmark target 
+ * (C) 2003-2004 by Harald Welte <laforge@netfilter.org>
+ * based on ideas of Fabio Olive Leite <olive@unixforge.org>
+ *
+ * Development of this code funded by SuSE Linux AG, http://www.suse.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/proc_fs.h>
+#include <linux/jhash.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/icmp.h>
+#include <linux/if_arp.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include <net/checksum.h>
+
+#include <linux/netfilter_arp.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/lockhelp.h>
+
+#define CLUSTERIP_VERSION "0.6"
+
+#define DEBUG_CLUSTERIP
+
+#ifdef DEBUG_CLUSTERIP
+#define DEBUGP	printk
+#else
+#define DEBUGP
+#endif
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("iptables target for CLUSTERIP");
+
+struct clusterip_config {
+	struct list_head list;			/* list of all configs */
+	atomic_t refcount;			/* reference count */
+
+	u_int32_t clusterip;			/* the IP address */
+	u_int8_t clustermac[ETH_ALEN];		/* the MAC address */
+	struct net_device *dev;			/* device */
+	u_int16_t num_total_nodes;		/* total number of nodes */
+	u_int16_t num_local_nodes;		/* number of local nodes */
+	u_int16_t local_nodes[CLUSTERIP_MAX_NODES];	/* node number array */
+
+#ifdef CONFIG_PROC_FS
+	struct proc_dir_entry *pde;		/* proc dir entry */
+#endif
+	enum clusterip_hashmode hash_mode;	/* which hashing mode */
+	u_int32_t hash_initval;			/* hash initialization */
+};
+
+static LIST_HEAD(clusterip_configs);
+
+/* clusterip_lock protects the clusterip_configs list _AND_ the configurable
+ * data within all structurses (num_local_nodes, local_nodes[]) */
+static DECLARE_RWLOCK(clusterip_lock);
+
+#ifdef CONFIG_PROC_FS
+static struct file_operations clusterip_proc_fops;
+static struct proc_dir_entry *clusterip_procdir;
+#endif
+
+static inline void
+clusterip_config_get(struct clusterip_config *c) {
+	atomic_inc(&c->refcount);
+}
+
+static inline void
+clusterip_config_put(struct clusterip_config *c) {
+	if (atomic_dec_and_test(&c->refcount)) {
+		WRITE_LOCK(&clusterip_lock);
+		list_del(&c->list);
+		WRITE_UNLOCK(&clusterip_lock);
+		dev_mc_delete(c->dev, c->clustermac, ETH_ALEN, 0);
+		dev_put(c->dev);
+		kfree(c);
+	}
+}
+
+
+static struct clusterip_config *
+__clusterip_config_find(u_int32_t clusterip)
+{
+	struct list_head *pos;
+
+	MUST_BE_READ_LOCKED(&clusterip_lock);
+	list_for_each(pos, &clusterip_configs) {
+		struct clusterip_config *c = list_entry(pos, 
+					struct clusterip_config, list);
+		if (c->clusterip == clusterip) {
+			return c;
+		}
+	}
+
+	return NULL;
+}
+
+static inline struct clusterip_config *
+clusterip_config_find_get(u_int32_t clusterip)
+{
+	struct clusterip_config *c;
+
+	READ_LOCK(&clusterip_lock);
+	c = __clusterip_config_find(clusterip);
+	if (!c) {
+		READ_UNLOCK(&clusterip_lock);
+		return NULL;
+	}
+	atomic_inc(&c->refcount);
+	READ_UNLOCK(&clusterip_lock);
+
+	return c;
+}
+
+static struct clusterip_config *
+clusterip_config_init(struct ipt_clusterip_tgt_info *i, u_int32_t ip,
+			struct net_device *dev)
+{
+	struct clusterip_config *c;
+	char buffer[16];
+
+	c = kmalloc(sizeof(*c), GFP_ATOMIC);
+	if (!c)
+		return NULL;
+
+	memset(c, 0, sizeof(*c));
+	c->dev = dev;
+	c->clusterip = ip;
+	memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
+	c->num_total_nodes = i->num_total_nodes;
+	c->num_local_nodes = i->num_local_nodes;
+	memcpy(&c->local_nodes, &i->local_nodes, sizeof(&c->local_nodes));
+	c->hash_mode = i->hash_mode;
+	c->hash_initval = i->hash_initval;
+	atomic_set(&c->refcount, 1);
+
+#ifdef CONFIG_PROC_FS
+	/* create proc dir entry */
+	sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(ip));
+	c->pde = create_proc_entry(buffer, S_IWUSR|S_IRUSR, clusterip_procdir);
+	if (!c->pde) {
+		kfree(c);
+		return NULL;
+	}
+	c->pde->proc_fops = &clusterip_proc_fops;
+	c->pde->data = c;
+#endif
+
+	WRITE_LOCK(&clusterip_lock);
+	list_add(&c->list, &clusterip_configs);
+	WRITE_UNLOCK(&clusterip_lock);
+
+	return c;
+}
+
+static int
+clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
+{
+	int i;
+
+	WRITE_LOCK(&clusterip_lock);
+
+	if (c->num_local_nodes >= CLUSTERIP_MAX_NODES
+	    || nodenum > CLUSTERIP_MAX_NODES) {
+		WRITE_UNLOCK(&clusterip_lock);
+		return 1;
+	}
+
+	/* check if we alrady have this number in our array */
+	for (i = 0; i < c->num_local_nodes; i++) {
+		if (c->local_nodes[i] == nodenum) {
+			WRITE_UNLOCK(&clusterip_lock);
+			return 1;
+		}
+	}
+
+	c->local_nodes[c->num_local_nodes++] = nodenum;
+
+	WRITE_UNLOCK(&clusterip_lock);
+	return 0;
+}
+
+static int
+clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
+{
+	int i;
+
+	WRITE_LOCK(&clusterip_lock);
+
+	if (c->num_local_nodes <= 1 || nodenum > CLUSTERIP_MAX_NODES) {
+		WRITE_UNLOCK(&clusterip_lock);
+		return 1;
+	}
+		
+	for (i = 0; i < c->num_local_nodes; i++) {
+		if (c->local_nodes[i] == nodenum) {
+			int size = sizeof(u_int16_t)*(c->num_local_nodes-(i+1));
+			memmove(&c->local_nodes[i], &c->local_nodes[i+1], size);
+			c->num_local_nodes--;
+			WRITE_UNLOCK(&clusterip_lock);
+			return 0;
+		}
+	}
+
+	WRITE_UNLOCK(&clusterip_lock);
+	return 1;
+}
+
+static inline u_int32_t
+clusterip_hashfn(struct sk_buff *skb, struct clusterip_config *config)
+{
+	struct iphdr *iph = skb->nh.iph;
+	unsigned long hashval;
+	u_int16_t sport, dport;
+	struct tcphdr *th;
+	struct udphdr *uh;
+	struct icmphdr *ih;
+
+	switch (iph->protocol) {
+	case IPPROTO_TCP:
+		th = (void *)iph+iph->ihl*4;
+		sport = ntohs(th->source);
+		dport = ntohs(th->dest);
+		break;
+	case IPPROTO_UDP:
+		uh = (void *)iph+iph->ihl*4;
+		sport = ntohs(uh->source);
+		dport = ntohs(uh->dest);
+		break;
+	case IPPROTO_ICMP:
+		ih = (void *)iph+iph->ihl*4;
+		sport = ntohs(ih->un.echo.id);
+		dport = (ih->type<<8)|ih->code;
+		break;
+	default:
+		if (net_ratelimit()) {
+			printk(KERN_NOTICE "CLUSTERIP: unknown protocol `%u'\n",
+				iph->protocol);
+		}
+		sport = dport = 0;
+	}
+
+	switch (config->hash_mode) {
+	case CLUSTERIP_HASHMODE_SIP:
+		hashval = jhash_1word(ntohl(iph->saddr),
+				      config->hash_initval);
+		break;
+	case CLUSTERIP_HASHMODE_SIP_SPT:
+		hashval = jhash_2words(ntohl(iph->saddr), sport, 
+				       config->hash_initval);
+		break;
+	case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
+		hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
+				       config->hash_initval);
+		break;
+	default:
+		/* to make gcc happy */
+		hashval = 0;
+		/* This cannot happen, unless the check function wasn't called
+		 * at rule load time */
+		printk("CLUSTERIP: unknown mode `%u'\n", config->hash_mode);
+		BUG();
+		break;
+	}
+
+	/* node numbers are 1..n, not 0..n */
+	return ((hashval % config->num_total_nodes)+1);
+}
+
+static inline int
+clusterip_responsible(struct clusterip_config *config, u_int32_t hash)
+{
+	int i;
+
+	READ_LOCK(&clusterip_lock);
+
+	if (config->num_local_nodes == 0) {
+		READ_UNLOCK(&clusterip_lock);
+		return 0;
+	}
+
+	for (i = 0; i < config->num_local_nodes; i++) {
+		if (config->local_nodes[i] == hash) {
+			READ_UNLOCK(&clusterip_lock);
+			return 1;
+		}
+	}
+
+	READ_UNLOCK(&clusterip_lock);
+
+	return 0;
+}
+
+/*********************************************************************** 
+ * IPTABLES TARGET 
+ ***********************************************************************/
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	const struct ipt_clusterip_tgt_info *cipinfo = targinfo;
+	enum ip_conntrack_info ctinfo;
+	struct ip_conntrack *ct = ip_conntrack_get((*pskb), &ctinfo);
+	u_int32_t hash;
+
+	/* don't need to clusterip_config_get() here, since refcount
+	 * is only decremented by destroy() - and ip_tables guarantees
+	 * that the ->target() function isn't called after ->destroy() */
+
+	if (!ct) {
+		printk(KERN_ERR "CLUSTERIP: no conntrack!\n");
+			/* FIXME: need to drop invalid ones, since replies
+			 * to outgoing connections of other nodes will be 
+			 * marked as INVALID */
+		return NF_DROP;
+	}
+
+	/* special case: ICMP error handling. conntrack distinguishes between
+	 * error messages (RELATED) and information requests (see below) */
+	if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP
+	    && (ctinfo == IP_CT_RELATED 
+		|| ctinfo == IP_CT_IS_REPLY+IP_CT_IS_REPLY))
+		return IPT_CONTINUE;
+
+	/* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO, 
+	 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
+	 * on, which all have an ID field [relevant for hashing]. */
+
+	hash = clusterip_hashfn(*pskb, cipinfo->config);
+
+	switch (ctinfo) {
+		case IP_CT_NEW:
+			ct->mark = hash;
+			break;
+		case IP_CT_RELATED:
+		case IP_CT_RELATED+IP_CT_IS_REPLY:
+			/* FIXME: we don't handle expectations at the
+			 * moment.  they can arrive on a different node than
+			 * the master connection (e.g. FTP passive mode) */
+		case IP_CT_ESTABLISHED:
+		case IP_CT_ESTABLISHED+IP_CT_IS_REPLY:
+			break;
+		default:
+			break;
+	}
+
+#ifdef DEBUG_CLUSTERP
+	DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+#endif
+	DEBUGP("hash=%u ct_hash=%lu ", hash, ct->mark);
+	if (!clusterip_responsible(cipinfo->config, hash)) {
+		DEBUGP("not responsible\n");
+		return NF_DROP;
+	}
+	DEBUGP("responsible\n");
+
+	/* despite being received via linklayer multicast, this is
+	 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
+	(*pskb)->pkt_type = PACKET_HOST;
+
+	return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
+           unsigned int hook_mask)
+{
+	struct ipt_clusterip_tgt_info *cipinfo = targinfo;
+
+	struct clusterip_config *config;
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_clusterip_tgt_info))) {
+		printk(KERN_WARNING "CLUSTERIP: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_clusterip_tgt_info)));
+		return 0;
+	}
+
+	if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
+	    cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
+	    cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
+		printk(KERN_WARNING "CLUSTERIP: unknown mode `%u'\n",
+			cipinfo->hash_mode);
+		return 0;
+
+	}
+	if (e->ip.dmsk.s_addr != 0xffffffff
+	    || e->ip.dst.s_addr == 0) {
+		printk(KERN_ERR "CLUSTERIP: Please specify destination IP\n");
+		return 0;
+	}
+
+	/* FIXME: further sanity checks */
+
+	config = clusterip_config_find_get(e->ip.dst.s_addr);
+	if (!config) {
+		if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
+			printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
+			return 0;
+		} else {
+			struct net_device *dev;
+
+			if (e->ip.iniface[0] == '\0') {
+				printk(KERN_WARNING "CLUSTERIP: Please specify an interface name\n");
+				return 0;
+			}
+
+			dev = dev_get_by_name(e->ip.iniface);
+			if (!dev) {
+				printk(KERN_WARNING "CLUSTERIP: no such interface %s\n", e->ip.iniface);
+				return 0;
+			}
+
+			config = clusterip_config_init(cipinfo, 
+							e->ip.dst.s_addr, dev);
+			if (!config) {
+				printk(KERN_WARNING "CLUSTERIP: cannot allocate config\n");
+				dev_put(dev);
+				return 0;
+			}
+			dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
+		}
+	}
+
+	cipinfo->config = config;
+
+	return 1;
+}
+
+/* drop reference count of cluster config when rule is deleted */
+static void destroy(void *matchinfo, unsigned int matchinfosize)
+{
+	struct ipt_clusterip_tgt_info *cipinfo = matchinfo;
+
+	/* we first remove the proc entry and then drop the reference
+	 * count.  In case anyone still accesses the file, the open/close
+	 * functions are also incrementing the refcount on their own */
+#ifdef CONFIG_PROC_FS
+	remove_proc_entry(cipinfo->config->pde->name,
+			  cipinfo->config->pde->parent);
+#endif
+	clusterip_config_put(cipinfo->config);
+}
+
+static struct ipt_target clusterip_tgt = { 
+	.name = "CLUSTERIP",
+	.target = &target, 
+	.checkentry = &checkentry, 
+	.destroy = &destroy,
+	.me = THIS_MODULE
+};
+
+
+/*********************************************************************** 
+ * ARP MANGLING CODE 
+ ***********************************************************************/
+
+/* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
+struct arp_payload {
+	u_int8_t src_hw[ETH_ALEN];
+	u_int32_t src_ip;
+	u_int8_t dst_hw[ETH_ALEN];
+	u_int32_t dst_ip;
+} __attribute__ ((packed));
+
+#ifdef CLUSTERIP_DEBUG
+static void arp_print(struct arp_payload *payload) 
+{
+#define HBUFFERLEN 30
+	char hbuffer[HBUFFERLEN];
+	int j,k;
+	const char hexbuf[]= "0123456789abcdef";
+
+	for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
+		hbuffer[k++]=hexbuf[(payload->src_hw[j]>>4)&15];
+		hbuffer[k++]=hexbuf[payload->src_hw[j]&15];
+		hbuffer[k++]=':';
+	}
+	hbuffer[--k]='\0';
+
+	printk("src %u.%u.%u.%u@%s, dst %u.%u.%u.%u\n", 
+		NIPQUAD(payload->src_ip), hbuffer,
+		NIPQUAD(payload->dst_ip));
+}
+#endif
+
+static unsigned int
+arp_mangle(unsigned int hook,
+	   struct sk_buff **pskb,
+	   const struct net_device *in,
+	   const struct net_device *out,
+	   int (*okfn)(struct sk_buff *))
+{
+	struct arphdr *arp = (*pskb)->nh.arph;
+	struct arp_payload *payload;
+	struct clusterip_config *c;
+
+	/* we don't care about non-ethernet and non-ipv4 ARP */
+	if (arp->ar_hrd != htons(ARPHRD_ETHER)
+	    || arp->ar_pro != htons(ETH_P_IP)
+	    || arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
+		return NF_ACCEPT;
+
+	/* we only want to mangle arp replies */
+	if (arp->ar_op != htons(ARPOP_REPLY))
+		return NF_ACCEPT;
+
+	payload = (void *)(arp+1);
+
+	/* if there is no clusterip configuration for the arp reply's 
+	 * source ip, we don't want to mangle it */
+	c = clusterip_config_find_get(payload->src_ip);
+	if (!c)
+		return NF_ACCEPT;
+
+	/* normally the linux kernel always replies to arp queries of 
+	 * addresses on different interfacs.  However, in the CLUSTERIP case
+	 * this wouldn't work, since we didn't subscribe the mcast group on
+	 * other interfaces */
+	if (c->dev != out) {
+		DEBUGP("CLUSTERIP: not mangling arp reply on different "
+		       "interface: cip'%s'-skb'%s'\n", c->dev->name, out->name);
+		clusterip_config_put(c);
+		return NF_ACCEPT;
+	}
+
+	/* mangle reply hardware address */
+	memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
+
+#ifdef CLUSTERIP_DEBUG
+	DEBUGP(KERN_DEBUG "CLUSTERIP mangled arp reply: ");
+	arp_print(payload);
+#endif
+
+	clusterip_config_put(c);
+
+	return NF_ACCEPT;
+}
+
+static struct nf_hook_ops cip_arp_ops = {
+	.hook = arp_mangle,
+	.pf = NF_ARP,
+	.hooknum = NF_ARP_OUT,
+	.priority = -1
+};
+
+/*********************************************************************** 
+ * PROC DIR HANDLING 
+ ***********************************************************************/
+
+#ifdef CONFIG_PROC_FS
+
+static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
+{
+	struct proc_dir_entry *pde = s->private;
+	struct clusterip_config *c = pde->data;
+	unsigned int *nodeidx;
+
+	READ_LOCK(&clusterip_lock);
+	if (*pos >= c->num_local_nodes)
+		return NULL;
+
+	nodeidx = kmalloc(sizeof(unsigned int), GFP_KERNEL);
+	if (!nodeidx)
+		return ERR_PTR(-ENOMEM);
+
+	*nodeidx = *pos;
+	return nodeidx;
+}
+
+static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	struct proc_dir_entry *pde = s->private;
+	struct clusterip_config *c = pde->data;
+	unsigned int *nodeidx = (unsigned int *)v;
+
+	*pos = ++(*nodeidx);
+	if (*pos >= c->num_local_nodes) {
+		kfree(v);
+		return NULL;
+	}
+	return nodeidx;
+}
+
+static void clusterip_seq_stop(struct seq_file *s, void *v)
+{
+	kfree(v);
+
+	READ_UNLOCK(&clusterip_lock);
+}
+
+static int clusterip_seq_show(struct seq_file *s, void *v)
+{
+	struct proc_dir_entry *pde = s->private;
+	struct clusterip_config *c = pde->data;
+	unsigned int *nodeidx = (unsigned int *)v;
+
+	if (*nodeidx != 0) 
+		seq_putc(s, ',');
+	seq_printf(s, "%u", c->local_nodes[*nodeidx]);
+
+	if (*nodeidx == c->num_local_nodes-1)
+		seq_putc(s, '\n');
+
+	return 0;
+}
+
+static struct seq_operations clusterip_seq_ops = {
+	.start	= clusterip_seq_start,
+	.next	= clusterip_seq_next,
+	.stop	= clusterip_seq_stop,
+	.show	= clusterip_seq_show,
+};
+
+static int clusterip_proc_open(struct inode *inode, struct file *file)
+{
+	int ret = seq_open(file, &clusterip_seq_ops);
+
+	if (!ret) {
+		struct seq_file *sf = file->private_data;
+		struct proc_dir_entry *pde = PDE(inode);
+		struct clusterip_config *c = pde->data;
+
+		sf->private = pde;
+
+		clusterip_config_get(c);
+	}
+
+	return ret;
+}
+
+static int clusterip_proc_release(struct inode *inode, struct file *file)
+{
+	struct proc_dir_entry *pde = PDE(inode);
+	struct clusterip_config *c = pde->data;
+	int ret;
+
+	ret = seq_release(inode, file);
+
+	if (!ret)
+		clusterip_config_put(c);
+
+	return ret;
+}
+
+static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
+				size_t size, loff_t *ofs)
+{
+#define PROC_WRITELEN	10
+	char buffer[PROC_WRITELEN+1];
+	struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode);
+	struct clusterip_config *c = pde->data;
+	unsigned long nodenum;
+
+	if (copy_from_user(buffer, input, PROC_WRITELEN))
+		return -EFAULT;
+
+	if (*buffer == '+') {
+		nodenum = simple_strtoul(buffer+1, NULL, 10);
+		if (clusterip_add_node(c, nodenum))
+			return -ENOMEM;
+	} else if (*buffer == '-') {
+		nodenum = simple_strtoul(buffer+1, NULL,10);
+		if (clusterip_del_node(c, nodenum))
+			return -ENOENT;
+	} else
+		return -EIO;
+
+	return size;
+}
+
+static struct file_operations clusterip_proc_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = clusterip_proc_open,
+	.read	 = seq_read,
+	.write	 = clusterip_proc_write,
+	.llseek	 = seq_lseek,
+	.release = clusterip_proc_release,
+};
+
+#endif /* CONFIG_PROC_FS */
+
+static int init_or_cleanup(int fini)
+{
+	int ret;
+
+	if (fini)
+		goto cleanup;
+
+	if (ipt_register_target(&clusterip_tgt)) {
+		ret = -EINVAL;
+		goto cleanup_none;
+	}
+
+	if (nf_register_hook(&cip_arp_ops) < 0) {
+		ret = -EINVAL;
+		goto cleanup_target;
+	}
+
+#ifdef CONFIG_PROC_FS
+	clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", proc_net);
+	if (!clusterip_procdir) {
+		printk(KERN_ERR "CLUSTERIP: Unable to proc dir entry\n");
+		ret = -ENOMEM;
+		goto cleanup_hook;
+	}
+#endif /* CONFIG_PROC_FS */
+
+	printk(KERN_NOTICE "ClusterIP Version %s loaded successfully\n",
+		CLUSTERIP_VERSION);
+
+	return 0;
+
+cleanup:
+	printk(KERN_NOTICE "ClusterIP Version %s unloading\n",
+		CLUSTERIP_VERSION);
+#ifdef CONFIG_PROC_FS
+	remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
+#endif
+cleanup_hook:
+	nf_unregister_hook(&cip_arp_ops);
+cleanup_target:
+	ipt_unregister_target(&clusterip_tgt);
+cleanup_none:
+	return -EINVAL;
+}
+
+static int __init init(void)
+{
+	return init_or_cleanup(0);
+}
+
+static void __exit fini(void)
+{
+	init_or_cleanup(1);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_CONNMARK.c b/net/ipv4/netfilter/ipt_CONNMARK.c
new file mode 100644
index 000000000000..30ddd3e18eb7
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_CONNMARK.c
@@ -0,0 +1,118 @@
+/* This kernel module is used to modify the connection mark values, or
+ * to optionally restore the skb nfmark from the connection mark
+ *
+ * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
+MODULE_DESCRIPTION("IP tables CONNMARK matching module");
+MODULE_LICENSE("GPL");
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_CONNMARK.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	const struct ipt_connmark_target_info *markinfo = targinfo;
+	unsigned long diff;
+	unsigned long nfmark;
+	unsigned long newmark;
+
+	enum ip_conntrack_info ctinfo;
+	struct ip_conntrack *ct = ip_conntrack_get((*pskb), &ctinfo);
+	if (ct) {
+	    switch(markinfo->mode) {
+	    case IPT_CONNMARK_SET:
+		newmark = (ct->mark & ~markinfo->mask) | markinfo->mark;
+		if (newmark != ct->mark)
+		    ct->mark = newmark;
+		break;
+	    case IPT_CONNMARK_SAVE:
+		newmark = (ct->mark & ~markinfo->mask) | ((*pskb)->nfmark & markinfo->mask);
+		if (ct->mark != newmark)
+		    ct->mark = newmark;
+		break;
+	    case IPT_CONNMARK_RESTORE:
+		nfmark = (*pskb)->nfmark;
+		diff = (ct->mark ^ nfmark) & markinfo->mask;
+		if (diff != 0) {
+		    (*pskb)->nfmark = nfmark ^ diff;
+		    (*pskb)->nfcache |= NFC_ALTERED;
+		}
+		break;
+	    }
+	}
+
+	return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_entry *e,
+	   void *targinfo,
+	   unsigned int targinfosize,
+	   unsigned int hook_mask)
+{
+	struct ipt_connmark_target_info *matchinfo = targinfo;
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_connmark_target_info))) {
+		printk(KERN_WARNING "CONNMARK: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_connmark_target_info)));
+		return 0;
+	}
+
+	if (matchinfo->mode == IPT_CONNMARK_RESTORE) {
+	    if (strcmp(tablename, "mangle") != 0) {
+		    printk(KERN_WARNING "CONNMARK: restore can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+		    return 0;
+	    }
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_connmark_reg = {
+	.name = "CONNMARK",
+	.target = &target,
+	.checkentry = &checkentry,
+	.me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&ipt_connmark_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_connmark_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_DSCP.c b/net/ipv4/netfilter/ipt_DSCP.c
new file mode 100644
index 000000000000..3ea4509099f9
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_DSCP.c
@@ -0,0 +1,106 @@
+/* iptables module for setting the IPv4 DSCP field, Version 1.8
+ *
+ * (C) 2002 by Harald Welte <laforge@netfilter.org>
+ * based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as 
+ * published by the Free Software Foundation.
+ * 
+ * See RFC2474 for a description of the DSCP field within the IP Header.
+ *
+ * ipt_DSCP.c,v 1.8 2002/08/06 18:41:57 laforge Exp
+*/
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_DSCP.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("iptables DSCP modification module");
+MODULE_LICENSE("GPL");
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	const struct ipt_DSCP_info *dinfo = targinfo;
+	u_int8_t sh_dscp = ((dinfo->dscp << IPT_DSCP_SHIFT) & IPT_DSCP_MASK);
+
+
+	if (((*pskb)->nh.iph->tos & IPT_DSCP_MASK) != sh_dscp) {
+		u_int16_t diffs[2];
+
+		if (!skb_ip_make_writable(pskb, sizeof(struct iphdr)))
+			return NF_DROP;
+
+		diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;
+		(*pskb)->nh.iph->tos = ((*pskb)->nh.iph->tos & ~IPT_DSCP_MASK)
+			| sh_dscp;
+		diffs[1] = htons((*pskb)->nh.iph->tos);
+		(*pskb)->nh.iph->check
+			= csum_fold(csum_partial((char *)diffs,
+						 sizeof(diffs),
+						 (*pskb)->nh.iph->check
+						 ^ 0xFFFF));
+		(*pskb)->nfcache |= NFC_ALTERED;
+	}
+	return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
+           unsigned int hook_mask)
+{
+	const u_int8_t dscp = ((struct ipt_DSCP_info *)targinfo)->dscp;
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_DSCP_info))) {
+		printk(KERN_WARNING "DSCP: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_DSCP_info)));
+		return 0;
+	}
+
+	if (strcmp(tablename, "mangle") != 0) {
+		printk(KERN_WARNING "DSCP: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+		return 0;
+	}
+
+	if ((dscp > IPT_DSCP_MAX)) {
+		printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_dscp_reg = {
+	.name		= "DSCP",
+	.target		= target,
+	.checkentry	= checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&ipt_dscp_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_dscp_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_ECN.c b/net/ipv4/netfilter/ipt_ECN.c
new file mode 100644
index 000000000000..ada9911118e9
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_ECN.c
@@ -0,0 +1,175 @@
+/* iptables module for the IPv4 and TCP ECN bits, Version 1.5
+ *
+ * (C) 2002 by Harald Welte <laforge@netfilter.org>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as 
+ * published by the Free Software Foundation.
+ *
+ * ipt_ECN.c,v 1.5 2002/08/18 19:36:51 laforge Exp
+*/
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ECN.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("iptables ECN modification module");
+
+/* set ECT codepoint from IP header.
+ * 	return 0 if there was an error. */
+static inline int
+set_ect_ip(struct sk_buff **pskb, const struct ipt_ECN_info *einfo)
+{
+	if (((*pskb)->nh.iph->tos & IPT_ECN_IP_MASK)
+	    != (einfo->ip_ect & IPT_ECN_IP_MASK)) {
+		u_int16_t diffs[2];
+
+		if (!skb_ip_make_writable(pskb, sizeof(struct iphdr)))
+			return 0;
+
+		diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;
+		(*pskb)->nh.iph->tos &= ~IPT_ECN_IP_MASK;
+		(*pskb)->nh.iph->tos |= (einfo->ip_ect & IPT_ECN_IP_MASK);
+		diffs[1] = htons((*pskb)->nh.iph->tos);
+		(*pskb)->nh.iph->check
+			= csum_fold(csum_partial((char *)diffs,
+						 sizeof(diffs),
+						 (*pskb)->nh.iph->check
+						 ^0xFFFF));
+		(*pskb)->nfcache |= NFC_ALTERED;
+	} 
+	return 1;
+}
+
+/* Return 0 if there was an error. */
+static inline int
+set_ect_tcp(struct sk_buff **pskb, const struct ipt_ECN_info *einfo, int inward)
+{
+	struct tcphdr _tcph, *tcph;
+	u_int16_t diffs[2];
+
+	/* Not enought header? */
+	tcph = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl*4,
+				  sizeof(_tcph), &_tcph);
+	if (!tcph)
+		return 0;
+
+	if (!(einfo->operation & IPT_ECN_OP_SET_ECE
+	      || tcph->ece == einfo->proto.tcp.ece)
+	    && (!(einfo->operation & IPT_ECN_OP_SET_CWR
+		  || tcph->cwr == einfo->proto.tcp.cwr)))
+		return 1;
+
+	if (!skb_ip_make_writable(pskb, (*pskb)->nh.iph->ihl*4+sizeof(*tcph)))
+		return 0;
+	tcph = (void *)(*pskb)->nh.iph + (*pskb)->nh.iph->ihl*4;
+
+	diffs[0] = ((u_int16_t *)tcph)[6];
+	if (einfo->operation & IPT_ECN_OP_SET_ECE)
+		tcph->ece = einfo->proto.tcp.ece;
+	if (einfo->operation & IPT_ECN_OP_SET_CWR)
+		tcph->cwr = einfo->proto.tcp.cwr;
+	diffs[1] = ((u_int16_t *)tcph)[6];
+	diffs[0] = diffs[0] ^ 0xFFFF;
+
+	if ((*pskb)->ip_summed != CHECKSUM_HW)
+		tcph->check = csum_fold(csum_partial((char *)diffs,
+						     sizeof(diffs),
+						     tcph->check^0xFFFF));
+	else
+		if (skb_checksum_help(*pskb, inward))
+			return 0;
+	(*pskb)->nfcache |= NFC_ALTERED;
+	return 1;
+}
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	const struct ipt_ECN_info *einfo = targinfo;
+
+	if (einfo->operation & IPT_ECN_OP_SET_IP)
+		if (!set_ect_ip(pskb, einfo))
+			return NF_DROP;
+
+	if (einfo->operation & (IPT_ECN_OP_SET_ECE | IPT_ECN_OP_SET_CWR)
+	    && (*pskb)->nh.iph->protocol == IPPROTO_TCP)
+		if (!set_ect_tcp(pskb, einfo, (out == NULL)))
+			return NF_DROP;
+
+	return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
+           unsigned int hook_mask)
+{
+	const struct ipt_ECN_info *einfo = (struct ipt_ECN_info *)targinfo;
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_ECN_info))) {
+		printk(KERN_WARNING "ECN: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_ECN_info)));
+		return 0;
+	}
+
+	if (strcmp(tablename, "mangle") != 0) {
+		printk(KERN_WARNING "ECN: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+		return 0;
+	}
+
+	if (einfo->operation & IPT_ECN_OP_MASK) {
+		printk(KERN_WARNING "ECN: unsupported ECN operation %x\n",
+			einfo->operation);
+		return 0;
+	}
+	if (einfo->ip_ect & ~IPT_ECN_IP_MASK) {
+		printk(KERN_WARNING "ECN: new ECT codepoint %x out of mask\n",
+			einfo->ip_ect);
+		return 0;
+	}
+
+	if ((einfo->operation & (IPT_ECN_OP_SET_ECE|IPT_ECN_OP_SET_CWR))
+	    && (e->ip.proto != IPPROTO_TCP || (e->ip.invflags & IPT_INV_PROTO))) {
+		printk(KERN_WARNING "ECN: cannot use TCP operations on a "
+		       "non-tcp rule\n");
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_ecn_reg = {
+	.name		= "ECN",
+	.target		= target,
+	.checkentry	= checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&ipt_ecn_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_ecn_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_LOG.c b/net/ipv4/netfilter/ipt_LOG.c
new file mode 100644
index 000000000000..ef08733d26da
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_LOG.c
@@ -0,0 +1,485 @@
+/*
+ * This is a module which is used for logging packets.
+ */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+#include <net/route.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_LOG.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables syslog logging module");
+
+static unsigned int nflog = 1;
+module_param(nflog, int, 0400);
+MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
+ 
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* Use lock to serialize, so printks don't overlap */
+static DEFINE_SPINLOCK(log_lock);
+
+/* One level of recursion won't kill us */
+static void dump_packet(const struct ipt_log_info *info,
+			const struct sk_buff *skb,
+			unsigned int iphoff)
+{
+	struct iphdr _iph, *ih;
+
+	ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
+	if (ih == NULL) {
+		printk("TRUNCATED");
+		return;
+	}
+
+	/* Important fields:
+	 * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
+	/* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */
+	printk("SRC=%u.%u.%u.%u DST=%u.%u.%u.%u ",
+	       NIPQUAD(ih->saddr), NIPQUAD(ih->daddr));
+
+	/* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */
+	printk("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ",
+	       ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK,
+	       ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id));
+
+	/* Max length: 6 "CE DF MF " */
+	if (ntohs(ih->frag_off) & IP_CE)
+		printk("CE ");
+	if (ntohs(ih->frag_off) & IP_DF)
+		printk("DF ");
+	if (ntohs(ih->frag_off) & IP_MF)
+		printk("MF ");
+
+	/* Max length: 11 "FRAG:65535 " */
+	if (ntohs(ih->frag_off) & IP_OFFSET)
+		printk("FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
+
+	if ((info->logflags & IPT_LOG_IPOPT)
+	    && ih->ihl * 4 > sizeof(struct iphdr)) {
+		unsigned char _opt[4 * 15 - sizeof(struct iphdr)], *op;
+		unsigned int i, optsize;
+
+		optsize = ih->ihl * 4 - sizeof(struct iphdr);
+		op = skb_header_pointer(skb, iphoff+sizeof(_iph),
+					optsize, _opt);
+		if (op == NULL) {
+			printk("TRUNCATED");
+			return;
+		}
+
+		/* Max length: 127 "OPT (" 15*4*2chars ") " */
+		printk("OPT (");
+		for (i = 0; i < optsize; i++)
+			printk("%02X", op[i]);
+		printk(") ");
+	}
+
+	switch (ih->protocol) {
+	case IPPROTO_TCP: {
+		struct tcphdr _tcph, *th;
+
+		/* Max length: 10 "PROTO=TCP " */
+		printk("PROTO=TCP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		th = skb_header_pointer(skb, iphoff + ih->ihl * 4,
+					sizeof(_tcph), &_tcph);
+		if (th == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Max length: 20 "SPT=65535 DPT=65535 " */
+		printk("SPT=%u DPT=%u ",
+		       ntohs(th->source), ntohs(th->dest));
+		/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
+		if (info->logflags & IPT_LOG_TCPSEQ)
+			printk("SEQ=%u ACK=%u ",
+			       ntohl(th->seq), ntohl(th->ack_seq));
+		/* Max length: 13 "WINDOW=65535 " */
+		printk("WINDOW=%u ", ntohs(th->window));
+		/* Max length: 9 "RES=0x3F " */
+		printk("RES=0x%02x ", (u8)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22));
+		/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
+		if (th->cwr)
+			printk("CWR ");
+		if (th->ece)
+			printk("ECE ");
+		if (th->urg)
+			printk("URG ");
+		if (th->ack)
+			printk("ACK ");
+		if (th->psh)
+			printk("PSH ");
+		if (th->rst)
+			printk("RST ");
+		if (th->syn)
+			printk("SYN ");
+		if (th->fin)
+			printk("FIN ");
+		/* Max length: 11 "URGP=65535 " */
+		printk("URGP=%u ", ntohs(th->urg_ptr));
+
+		if ((info->logflags & IPT_LOG_TCPOPT)
+		    && th->doff * 4 > sizeof(struct tcphdr)) {
+			unsigned char _opt[4 * 15 - sizeof(struct tcphdr)];
+			unsigned char *op;
+			unsigned int i, optsize;
+
+			optsize = th->doff * 4 - sizeof(struct tcphdr);
+			op = skb_header_pointer(skb,
+						iphoff+ih->ihl*4+sizeof(_tcph),
+						optsize, _opt);
+			if (op == NULL) {
+				printk("TRUNCATED");
+				return;
+			}
+
+			/* Max length: 127 "OPT (" 15*4*2chars ") " */
+			printk("OPT (");
+			for (i = 0; i < optsize; i++)
+				printk("%02X", op[i]);
+			printk(") ");
+		}
+		break;
+	}
+	case IPPROTO_UDP: {
+		struct udphdr _udph, *uh;
+
+		/* Max length: 10 "PROTO=UDP " */
+		printk("PROTO=UDP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		uh = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_udph), &_udph);
+		if (uh == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Max length: 20 "SPT=65535 DPT=65535 " */
+		printk("SPT=%u DPT=%u LEN=%u ",
+		       ntohs(uh->source), ntohs(uh->dest),
+		       ntohs(uh->len));
+		break;
+	}
+	case IPPROTO_ICMP: {
+		struct icmphdr _icmph, *ich;
+		static size_t required_len[NR_ICMP_TYPES+1]
+			= { [ICMP_ECHOREPLY] = 4,
+			    [ICMP_DEST_UNREACH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_SOURCE_QUENCH]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_REDIRECT]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_ECHO] = 4,
+			    [ICMP_TIME_EXCEEDED]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_PARAMETERPROB]
+			    = 8 + sizeof(struct iphdr),
+			    [ICMP_TIMESTAMP] = 20,
+			    [ICMP_TIMESTAMPREPLY] = 20,
+			    [ICMP_ADDRESS] = 12,
+			    [ICMP_ADDRESSREPLY] = 12 };
+
+		/* Max length: 11 "PROTO=ICMP " */
+		printk("PROTO=ICMP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ich = skb_header_pointer(skb, iphoff + ih->ihl * 4,
+					 sizeof(_icmph), &_icmph);
+		if (ich == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Max length: 18 "TYPE=255 CODE=255 " */
+		printk("TYPE=%u CODE=%u ", ich->type, ich->code);
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		if (ich->type <= NR_ICMP_TYPES
+		    && required_len[ich->type]
+		    && skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		switch (ich->type) {
+		case ICMP_ECHOREPLY:
+		case ICMP_ECHO:
+			/* Max length: 19 "ID=65535 SEQ=65535 " */
+			printk("ID=%u SEQ=%u ",
+			       ntohs(ich->un.echo.id),
+			       ntohs(ich->un.echo.sequence));
+			break;
+
+		case ICMP_PARAMETERPROB:
+			/* Max length: 14 "PARAMETER=255 " */
+			printk("PARAMETER=%u ",
+			       ntohl(ich->un.gateway) >> 24);
+			break;
+		case ICMP_REDIRECT:
+			/* Max length: 24 "GATEWAY=255.255.255.255 " */
+			printk("GATEWAY=%u.%u.%u.%u ",
+			       NIPQUAD(ich->un.gateway));
+			/* Fall through */
+		case ICMP_DEST_UNREACH:
+		case ICMP_SOURCE_QUENCH:
+		case ICMP_TIME_EXCEEDED:
+			/* Max length: 3+maxlen */
+			if (!iphoff) { /* Only recurse once. */
+				printk("[");
+				dump_packet(info, skb,
+					    iphoff + ih->ihl*4+sizeof(_icmph));
+				printk("] ");
+			}
+
+			/* Max length: 10 "MTU=65535 " */
+			if (ich->type == ICMP_DEST_UNREACH
+			    && ich->code == ICMP_FRAG_NEEDED)
+				printk("MTU=%u ", ntohs(ich->un.frag.mtu));
+		}
+		break;
+	}
+	/* Max Length */
+	case IPPROTO_AH: {
+		struct ip_auth_hdr _ahdr, *ah;
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+		
+		/* Max length: 9 "PROTO=AH " */
+		printk("PROTO=AH ");
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		ah = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_ahdr), &_ahdr);
+		if (ah == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		printk("SPI=0x%x ", ntohl(ah->spi));
+		break;
+	}
+	case IPPROTO_ESP: {
+		struct ip_esp_hdr _esph, *eh;
+
+		/* Max length: 10 "PROTO=ESP " */
+		printk("PROTO=ESP ");
+
+		if (ntohs(ih->frag_off) & IP_OFFSET)
+			break;
+
+		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
+		eh = skb_header_pointer(skb, iphoff+ih->ihl*4,
+					sizeof(_esph), &_esph);
+		if (eh == NULL) {
+			printk("INCOMPLETE [%u bytes] ",
+			       skb->len - iphoff - ih->ihl*4);
+			break;
+		}
+
+		/* Length: 15 "SPI=0xF1234567 " */
+		printk("SPI=0x%x ", ntohl(eh->spi));
+		break;
+	}
+	/* Max length: 10 "PROTO 255 " */
+	default:
+		printk("PROTO=%u ", ih->protocol);
+	}
+
+	/* Max length: 15 "UID=4294967295 " */
+ 	if ((info->logflags & IPT_LOG_UID) && !iphoff && skb->sk) {
+		read_lock_bh(&skb->sk->sk_callback_lock);
+		if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+ 			printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
+		read_unlock_bh(&skb->sk->sk_callback_lock);
+	}
+
+	/* Proto    Max log string length */
+	/* IP:      40+46+6+11+127 = 230 */
+	/* TCP:     10+max(25,20+30+13+9+32+11+127) = 252 */
+	/* UDP:     10+max(25,20) = 35 */
+	/* ICMP:    11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
+	/* ESP:     10+max(25)+15 = 50 */
+	/* AH:      9+max(25)+15 = 49 */
+	/* unknown: 10 */
+
+	/* (ICMP allows recursion one level deep) */
+	/* maxlen =  IP + ICMP +  IP + max(TCP,UDP,ICMP,unknown) */
+	/* maxlen = 230+   91  + 230 + 252 = 803 */
+}
+
+static void
+ipt_log_packet(unsigned int hooknum,
+	       const struct sk_buff *skb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const struct ipt_log_info *loginfo,
+	       const char *level_string,
+	       const char *prefix)
+{
+	spin_lock_bh(&log_lock);
+	printk(level_string);
+	printk("%sIN=%s OUT=%s ",
+	       prefix == NULL ? loginfo->prefix : prefix,
+	       in ? in->name : "",
+	       out ? out->name : "");
+#ifdef CONFIG_BRIDGE_NETFILTER
+	if (skb->nf_bridge) {
+		struct net_device *physindev = skb->nf_bridge->physindev;
+		struct net_device *physoutdev = skb->nf_bridge->physoutdev;
+
+		if (physindev && in != physindev)
+			printk("PHYSIN=%s ", physindev->name);
+		if (physoutdev && out != physoutdev)
+			printk("PHYSOUT=%s ", physoutdev->name);
+	}
+#endif
+
+	if (in && !out) {
+		/* MAC logging for input chain only. */
+		printk("MAC=");
+		if (skb->dev && skb->dev->hard_header_len
+		    && skb->mac.raw != (void*)skb->nh.iph) {
+			int i;
+			unsigned char *p = skb->mac.raw;
+			for (i = 0; i < skb->dev->hard_header_len; i++,p++)
+				printk("%02x%c", *p,
+				       i==skb->dev->hard_header_len - 1
+				       ? ' ':':');
+		} else
+			printk(" ");
+	}
+
+	dump_packet(loginfo, skb, 0);
+	printk("\n");
+	spin_unlock_bh(&log_lock);
+}
+
+static unsigned int
+ipt_log_target(struct sk_buff **pskb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       unsigned int hooknum,
+	       const void *targinfo,
+	       void *userinfo)
+{
+	const struct ipt_log_info *loginfo = targinfo;
+	char level_string[4] = "< >";
+
+	level_string[1] = '0' + (loginfo->level % 8);
+	ipt_log_packet(hooknum, *pskb, in, out, loginfo, level_string, NULL);
+
+	return IPT_CONTINUE;
+}
+
+static void
+ipt_logfn(unsigned int hooknum,
+	  const struct sk_buff *skb,
+	  const struct net_device *in,
+	  const struct net_device *out,
+	  const char *prefix)
+{
+	struct ipt_log_info loginfo = { 
+		.level = 0, 
+		.logflags = IPT_LOG_MASK, 
+		.prefix = "" 
+	};
+
+	ipt_log_packet(hooknum, skb, in, out, &loginfo, KERN_WARNING, prefix);
+}
+
+static int ipt_log_checkentry(const char *tablename,
+			      const struct ipt_entry *e,
+			      void *targinfo,
+			      unsigned int targinfosize,
+			      unsigned int hook_mask)
+{
+	const struct ipt_log_info *loginfo = targinfo;
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_log_info))) {
+		DEBUGP("LOG: targinfosize %u != %u\n",
+		       targinfosize, IPT_ALIGN(sizeof(struct ipt_log_info)));
+		return 0;
+	}
+
+	if (loginfo->level >= 8) {
+		DEBUGP("LOG: level %u >= 8\n", loginfo->level);
+		return 0;
+	}
+
+	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
+		DEBUGP("LOG: prefix term %i\n",
+		       loginfo->prefix[sizeof(loginfo->prefix)-1]);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_log_reg = {
+	.name		= "LOG",
+	.target		= ipt_log_target,
+	.checkentry	= ipt_log_checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	if (ipt_register_target(&ipt_log_reg))
+		return -EINVAL;
+	if (nflog)
+		nf_log_register(PF_INET, &ipt_logfn);
+	
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	if (nflog)
+		nf_log_unregister(PF_INET, &ipt_logfn);
+	ipt_unregister_target(&ipt_log_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_MARK.c b/net/ipv4/netfilter/ipt_MARK.c
new file mode 100644
index 000000000000..33c6f9b63b8d
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_MARK.c
@@ -0,0 +1,162 @@
+/* This is a module which is used for setting the NFMARK field of an skb. */
+
+/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_MARK.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("iptables MARK modification module");
+
+static unsigned int
+target_v0(struct sk_buff **pskb,
+	  const struct net_device *in,
+	  const struct net_device *out,
+	  unsigned int hooknum,
+	  const void *targinfo,
+	  void *userinfo)
+{
+	const struct ipt_mark_target_info *markinfo = targinfo;
+
+	if((*pskb)->nfmark != markinfo->mark) {
+		(*pskb)->nfmark = markinfo->mark;
+		(*pskb)->nfcache |= NFC_ALTERED;
+	}
+	return IPT_CONTINUE;
+}
+
+static unsigned int
+target_v1(struct sk_buff **pskb,
+	  const struct net_device *in,
+	  const struct net_device *out,
+	  unsigned int hooknum,
+	  const void *targinfo,
+	  void *userinfo)
+{
+	const struct ipt_mark_target_info_v1 *markinfo = targinfo;
+	int mark = 0;
+
+	switch (markinfo->mode) {
+	case IPT_MARK_SET:
+		mark = markinfo->mark;
+		break;
+		
+	case IPT_MARK_AND:
+		mark = (*pskb)->nfmark & markinfo->mark;
+		break;
+		
+	case IPT_MARK_OR:
+		mark = (*pskb)->nfmark | markinfo->mark;
+		break;
+	}
+
+	if((*pskb)->nfmark != mark) {
+		(*pskb)->nfmark = mark;
+		(*pskb)->nfcache |= NFC_ALTERED;
+	}
+	return IPT_CONTINUE;
+}
+
+
+static int
+checkentry_v0(const char *tablename,
+	      const struct ipt_entry *e,
+	      void *targinfo,
+	      unsigned int targinfosize,
+	      unsigned int hook_mask)
+{
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_mark_target_info))) {
+		printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_mark_target_info)));
+		return 0;
+	}
+
+	if (strcmp(tablename, "mangle") != 0) {
+		printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int
+checkentry_v1(const char *tablename,
+	      const struct ipt_entry *e,
+	      void *targinfo,
+	      unsigned int targinfosize,
+	      unsigned int hook_mask)
+{
+	struct ipt_mark_target_info_v1 *markinfo = targinfo;
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_mark_target_info_v1))){
+		printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_mark_target_info_v1)));
+		return 0;
+	}
+
+	if (strcmp(tablename, "mangle") != 0) {
+		printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+		return 0;
+	}
+
+	if (markinfo->mode != IPT_MARK_SET
+	    && markinfo->mode != IPT_MARK_AND
+	    && markinfo->mode != IPT_MARK_OR) {
+		printk(KERN_WARNING "MARK: unknown mode %u\n",
+		       markinfo->mode);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_mark_reg_v0 = {
+	.name		= "MARK",
+	.target		= target_v0,
+	.checkentry	= checkentry_v0,
+	.me		= THIS_MODULE,
+	.revision	= 0,
+};
+
+static struct ipt_target ipt_mark_reg_v1 = {
+	.name		= "MARK",
+	.target		= target_v1,
+	.checkentry	= checkentry_v1,
+	.me		= THIS_MODULE,
+	.revision	= 1,
+};
+
+static int __init init(void)
+{
+	int err;
+
+	err = ipt_register_target(&ipt_mark_reg_v0);
+	if (!err) {
+		err = ipt_register_target(&ipt_mark_reg_v1);
+		if (err)
+			ipt_unregister_target(&ipt_mark_reg_v0);
+	}
+	return err;
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_mark_reg_v0);
+	ipt_unregister_target(&ipt_mark_reg_v1);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_MASQUERADE.c b/net/ipv4/netfilter/ipt_MASQUERADE.c
new file mode 100644
index 000000000000..57e9f6cf1c36
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_MASQUERADE.c
@@ -0,0 +1,207 @@
+/* Masquerade.  Simple mapping which alters range to a local IP address
+   (depending on route). */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/timer.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <net/protocol.h>
+#include <net/ip.h>
+#include <net/checksum.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables MASQUERADE target module");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* Lock protects masq region inside conntrack */
+static DECLARE_RWLOCK(masq_lock);
+
+/* FIXME: Multiple targets. --RR */
+static int
+masquerade_check(const char *tablename,
+		 const struct ipt_entry *e,
+		 void *targinfo,
+		 unsigned int targinfosize,
+		 unsigned int hook_mask)
+{
+	const struct ip_nat_multi_range_compat *mr = targinfo;
+
+	if (strcmp(tablename, "nat") != 0) {
+		DEBUGP("masquerade_check: bad table `%s'.\n", tablename);
+		return 0;
+	}
+	if (targinfosize != IPT_ALIGN(sizeof(*mr))) {
+		DEBUGP("masquerade_check: size %u != %u.\n",
+		       targinfosize, sizeof(*mr));
+		return 0;
+	}
+	if (hook_mask & ~(1 << NF_IP_POST_ROUTING)) {
+		DEBUGP("masquerade_check: bad hooks %x.\n", hook_mask);
+		return 0;
+	}
+	if (mr->range[0].flags & IP_NAT_RANGE_MAP_IPS) {
+		DEBUGP("masquerade_check: bad MAP_IPS.\n");
+		return 0;
+	}
+	if (mr->rangesize != 1) {
+		DEBUGP("masquerade_check: bad rangesize %u.\n", mr->rangesize);
+		return 0;
+	}
+	return 1;
+}
+
+static unsigned int
+masquerade_target(struct sk_buff **pskb,
+		  const struct net_device *in,
+		  const struct net_device *out,
+		  unsigned int hooknum,
+		  const void *targinfo,
+		  void *userinfo)
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	const struct ip_nat_multi_range_compat *mr;
+	struct ip_nat_range newrange;
+	struct rtable *rt;
+	u_int32_t newsrc;
+
+	IP_NF_ASSERT(hooknum == NF_IP_POST_ROUTING);
+
+	/* FIXME: For the moment, don't do local packets, breaks
+	   testsuite for 2.3.49 --RR */
+	if ((*pskb)->sk)
+		return NF_ACCEPT;
+
+	ct = ip_conntrack_get(*pskb, &ctinfo);
+	IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
+	                    || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
+
+	mr = targinfo;
+	rt = (struct rtable *)(*pskb)->dst;
+	newsrc = inet_select_addr(out, rt->rt_gateway, RT_SCOPE_UNIVERSE);
+	if (!newsrc) {
+		printk("MASQUERADE: %s ate my IP address\n", out->name);
+		return NF_DROP;
+	}
+
+	WRITE_LOCK(&masq_lock);
+	ct->nat.masq_index = out->ifindex;
+	WRITE_UNLOCK(&masq_lock);
+
+	/* Transfer from original range. */
+	newrange = ((struct ip_nat_range)
+		{ mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
+		  newsrc, newsrc,
+		  mr->range[0].min, mr->range[0].max });
+
+	/* Hand modified range to generic setup. */
+	return ip_nat_setup_info(ct, &newrange, hooknum);
+}
+
+static inline int
+device_cmp(struct ip_conntrack *i, void *ifindex)
+{
+	int ret;
+
+	READ_LOCK(&masq_lock);
+	ret = (i->nat.masq_index == (int)(long)ifindex);
+	READ_UNLOCK(&masq_lock);
+
+	return ret;
+}
+
+static int masq_device_event(struct notifier_block *this,
+			     unsigned long event,
+			     void *ptr)
+{
+	struct net_device *dev = ptr;
+
+	if (event == NETDEV_DOWN) {
+		/* Device was downed.  Search entire table for
+		   conntracks which were associated with that device,
+		   and forget them. */
+		IP_NF_ASSERT(dev->ifindex != 0);
+
+		ip_ct_iterate_cleanup(device_cmp, (void *)(long)dev->ifindex);
+	}
+
+	return NOTIFY_DONE;
+}
+
+static int masq_inet_event(struct notifier_block *this,
+			   unsigned long event,
+			   void *ptr)
+{
+	struct net_device *dev = ((struct in_ifaddr *)ptr)->ifa_dev->dev;
+
+	if (event == NETDEV_DOWN) {
+		/* IP address was deleted.  Search entire table for
+		   conntracks which were associated with that device,
+		   and forget them. */
+		IP_NF_ASSERT(dev->ifindex != 0);
+
+		ip_ct_iterate_cleanup(device_cmp, (void *)(long)dev->ifindex);
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block masq_dev_notifier = {
+	.notifier_call	= masq_device_event,
+};
+
+static struct notifier_block masq_inet_notifier = {
+	.notifier_call	= masq_inet_event,
+};
+
+static struct ipt_target masquerade = {
+	.name		= "MASQUERADE",
+	.target		= masquerade_target,
+	.checkentry	= masquerade_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	int ret;
+
+	ret = ipt_register_target(&masquerade);
+
+	if (ret == 0) {
+		/* Register for device down reports */
+		register_netdevice_notifier(&masq_dev_notifier);
+		/* Register IP address change reports */
+		register_inetaddr_notifier(&masq_inet_notifier);
+	}
+
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&masquerade);
+	unregister_netdevice_notifier(&masq_dev_notifier);
+	unregister_inetaddr_notifier(&masq_inet_notifier);	
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_NETMAP.c b/net/ipv4/netfilter/ipt_NETMAP.c
new file mode 100644
index 000000000000..06254b29d034
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_NETMAP.c
@@ -0,0 +1,117 @@
+/* NETMAP - static NAT mapping of IP network addresses (1:1).
+ * The mapping can be applied to source (POSTROUTING),
+ * destination (PREROUTING), or both (with separate rules).
+ */
+
+/* (C) 2000-2001 Svenning Soerensen <svenning@post5.tele.dk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/ip.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+
+#define MODULENAME "NETMAP"
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Svenning Soerensen <svenning@post5.tele.dk>");
+MODULE_DESCRIPTION("iptables 1:1 NAT mapping of IP networks target");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static int
+check(const char *tablename,
+      const struct ipt_entry *e,
+      void *targinfo,
+      unsigned int targinfosize,
+      unsigned int hook_mask)
+{
+	const struct ip_nat_multi_range_compat *mr = targinfo;
+
+	if (strcmp(tablename, "nat") != 0) {
+		DEBUGP(MODULENAME":check: bad table `%s'.\n", tablename);
+		return 0;
+	}
+	if (targinfosize != IPT_ALIGN(sizeof(*mr))) {
+		DEBUGP(MODULENAME":check: size %u.\n", targinfosize);
+		return 0;
+	}
+	if (hook_mask & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_POST_ROUTING))) {
+		DEBUGP(MODULENAME":check: bad hooks %x.\n", hook_mask);
+		return 0;
+	}
+	if (!(mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)) {
+		DEBUGP(MODULENAME":check: bad MAP_IPS.\n");
+		return 0;
+	}
+	if (mr->rangesize != 1) {
+		DEBUGP(MODULENAME":check: bad rangesize %u.\n", mr->rangesize);
+		return 0;
+	}
+	return 1;
+}
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	u_int32_t new_ip, netmask;
+	const struct ip_nat_multi_range_compat *mr = targinfo;
+	struct ip_nat_range newrange;
+
+	IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
+		     || hooknum == NF_IP_POST_ROUTING);
+	ct = ip_conntrack_get(*pskb, &ctinfo);
+
+	netmask = ~(mr->range[0].min_ip ^ mr->range[0].max_ip);
+
+	if (hooknum == NF_IP_PRE_ROUTING)
+		new_ip = (*pskb)->nh.iph->daddr & ~netmask;
+	else
+		new_ip = (*pskb)->nh.iph->saddr & ~netmask;
+	new_ip |= mr->range[0].min_ip & netmask;
+
+	newrange = ((struct ip_nat_range)
+		{ mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
+		  new_ip, new_ip,
+		  mr->range[0].min, mr->range[0].max });
+
+	/* Hand modified range to generic setup. */
+	return ip_nat_setup_info(ct, &newrange, hooknum);
+}
+
+static struct ipt_target target_module = { 
+	.name 		= MODULENAME,
+	.target 	= target, 
+	.checkentry 	= check,
+    	.me 		= THIS_MODULE 
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&target_module);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&target_module);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_NOTRACK.c b/net/ipv4/netfilter/ipt_NOTRACK.c
new file mode 100644
index 000000000000..a4bb9b3bc292
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_NOTRACK.c
@@ -0,0 +1,76 @@
+/* This is a module which is used for setting up fake conntracks
+ * on packets so that they are not seen by the conntrack/NAT code.
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	/* Previously seen (loopback)? Ignore. */
+	if ((*pskb)->nfct != NULL)
+		return IPT_CONTINUE;
+
+	/* Attach fake conntrack entry. 
+	   If there is a real ct entry correspondig to this packet, 
+	   it'll hang aroun till timing out. We don't deal with it
+	   for performance reasons. JK */
+	(*pskb)->nfct = &ip_conntrack_untracked.ct_general;
+	(*pskb)->nfctinfo = IP_CT_NEW;
+	nf_conntrack_get((*pskb)->nfct);
+
+	return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
+           unsigned int hook_mask)
+{
+	if (targinfosize != 0) {
+		printk(KERN_WARNING "NOTRACK: targinfosize %u != 0\n",
+		       targinfosize);
+		return 0;
+	}
+
+	if (strcmp(tablename, "raw") != 0) {
+		printk(KERN_WARNING "NOTRACK: can only be called from \"raw\" table, not \"%s\"\n", tablename);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_notrack_reg = { 
+	.name = "NOTRACK", 
+	.target = target, 
+	.checkentry = checkentry,
+	.me = THIS_MODULE 
+};
+
+static int __init init(void)
+{
+	if (ipt_register_target(&ipt_notrack_reg))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_notrack_reg);
+}
+
+module_init(init);
+module_exit(fini);
+MODULE_LICENSE("GPL");
diff --git a/net/ipv4/netfilter/ipt_REDIRECT.c b/net/ipv4/netfilter/ipt_REDIRECT.c
new file mode 100644
index 000000000000..d2e13447678e
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_REDIRECT.c
@@ -0,0 +1,129 @@
+/* Redirect.  Simple mapping which alters dst to a local IP address. */
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/timer.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/netdevice.h>
+#include <linux/if.h>
+#include <linux/inetdevice.h>
+#include <net/protocol.h>
+#include <net/checksum.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables REDIRECT target module");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* FIXME: Take multiple ranges --RR */
+static int
+redirect_check(const char *tablename,
+	       const struct ipt_entry *e,
+	       void *targinfo,
+	       unsigned int targinfosize,
+	       unsigned int hook_mask)
+{
+	const struct ip_nat_multi_range_compat *mr = targinfo;
+
+	if (strcmp(tablename, "nat") != 0) {
+		DEBUGP("redirect_check: bad table `%s'.\n", table);
+		return 0;
+	}
+	if (targinfosize != IPT_ALIGN(sizeof(*mr))) {
+		DEBUGP("redirect_check: size %u.\n", targinfosize);
+		return 0;
+	}
+	if (hook_mask & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT))) {
+		DEBUGP("redirect_check: bad hooks %x.\n", hook_mask);
+		return 0;
+	}
+	if (mr->range[0].flags & IP_NAT_RANGE_MAP_IPS) {
+		DEBUGP("redirect_check: bad MAP_IPS.\n");
+		return 0;
+	}
+	if (mr->rangesize != 1) {
+		DEBUGP("redirect_check: bad rangesize %u.\n", mr->rangesize);
+		return 0;
+	}
+	return 1;
+}
+
+static unsigned int
+redirect_target(struct sk_buff **pskb,
+		const struct net_device *in,
+		const struct net_device *out,
+		unsigned int hooknum,
+		const void *targinfo,
+		void *userinfo)
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	u_int32_t newdst;
+	const struct ip_nat_multi_range_compat *mr = targinfo;
+	struct ip_nat_range newrange;
+
+	IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
+		     || hooknum == NF_IP_LOCAL_OUT);
+
+	ct = ip_conntrack_get(*pskb, &ctinfo);
+	IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
+
+	/* Local packets: make them go to loopback */
+	if (hooknum == NF_IP_LOCAL_OUT)
+		newdst = htonl(0x7F000001);
+	else {
+		struct in_device *indev;
+
+		/* Device might not have an associated in_device. */
+		indev = (struct in_device *)(*pskb)->dev->ip_ptr;
+		if (indev == NULL || indev->ifa_list == NULL)
+			return NF_DROP;
+
+		/* Grab first address on interface. */
+		newdst = indev->ifa_list->ifa_local;
+	}
+
+	/* Transfer from original range. */
+	newrange = ((struct ip_nat_range)
+		{ mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
+		  newdst, newdst,
+		  mr->range[0].min, mr->range[0].max });
+
+	/* Hand modified range to generic setup. */
+	return ip_nat_setup_info(ct, &newrange, hooknum);
+}
+
+static struct ipt_target redirect_reg = {
+	.name		= "REDIRECT",
+	.target		= redirect_target,
+	.checkentry	= redirect_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&redirect_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&redirect_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_REJECT.c b/net/ipv4/netfilter/ipt_REJECT.c
new file mode 100644
index 000000000000..266d64979286
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_REJECT.c
@@ -0,0 +1,335 @@
+/*
+ * This is a module which is used for rejecting packets.
+ * Added support for customized reject packets (Jozsef Kadlecsik).
+ * Added support for ICMP type-3-code-13 (Maciej Soltysiak). [RFC 1812]
+ */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/icmp.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/tcp.h>
+#include <net/route.h>
+#include <net/dst.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_REJECT.h>
+#ifdef CONFIG_BRIDGE_NETFILTER
+#include <linux/netfilter_bridge.h>
+#endif
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables REJECT target module");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static inline struct rtable *route_reverse(struct sk_buff *skb, 
+					   struct tcphdr *tcph, int hook)
+{
+	struct iphdr *iph = skb->nh.iph;
+	struct dst_entry *odst;
+	struct flowi fl = {};
+	struct rtable *rt;
+
+	/* We don't require ip forwarding to be enabled to be able to
+	 * send a RST reply for bridged traffic. */
+	if (hook != NF_IP_FORWARD
+#ifdef CONFIG_BRIDGE_NETFILTER
+	    || (skb->nf_bridge && skb->nf_bridge->mask & BRNF_BRIDGED)
+#endif
+	   ) {
+		fl.nl_u.ip4_u.daddr = iph->saddr;
+		if (hook == NF_IP_LOCAL_IN)
+			fl.nl_u.ip4_u.saddr = iph->daddr;
+		fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
+
+		if (ip_route_output_key(&rt, &fl) != 0)
+			return NULL;
+	} else {
+		/* non-local src, find valid iif to satisfy
+		 * rp-filter when calling ip_route_input. */
+		fl.nl_u.ip4_u.daddr = iph->daddr;
+		if (ip_route_output_key(&rt, &fl) != 0)
+			return NULL;
+
+		odst = skb->dst;
+		if (ip_route_input(skb, iph->saddr, iph->daddr,
+		                   RT_TOS(iph->tos), rt->u.dst.dev) != 0) {
+			dst_release(&rt->u.dst);
+			return NULL;
+		}
+		dst_release(&rt->u.dst);
+		rt = (struct rtable *)skb->dst;
+		skb->dst = odst;
+
+		fl.nl_u.ip4_u.daddr = iph->saddr;
+		fl.nl_u.ip4_u.saddr = iph->daddr;
+		fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
+	}
+
+	if (rt->u.dst.error) {
+		dst_release(&rt->u.dst);
+		return NULL;
+	}
+
+	fl.proto = IPPROTO_TCP;
+	fl.fl_ip_sport = tcph->dest;
+	fl.fl_ip_dport = tcph->source;
+
+	if (xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0)) {
+		dst_release(&rt->u.dst);
+		rt = NULL;
+	}
+
+	return rt;
+}
+
+/* Send RST reply */
+static void send_reset(struct sk_buff *oldskb, int hook)
+{
+	struct sk_buff *nskb;
+	struct tcphdr _otcph, *oth, *tcph;
+	struct rtable *rt;
+	u_int16_t tmp_port;
+	u_int32_t tmp_addr;
+	int needs_ack;
+	int hh_len;
+
+	/* IP header checks: fragment. */
+	if (oldskb->nh.iph->frag_off & htons(IP_OFFSET))
+		return;
+
+	oth = skb_header_pointer(oldskb, oldskb->nh.iph->ihl * 4,
+				 sizeof(_otcph), &_otcph);
+	if (oth == NULL)
+ 		return;
+
+	/* No RST for RST. */
+	if (oth->rst)
+		return;
+
+	/* FIXME: Check checksum --RR */
+	if ((rt = route_reverse(oldskb, oth, hook)) == NULL)
+		return;
+
+	hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
+
+	/* We need a linear, writeable skb.  We also need to expand
+	   headroom in case hh_len of incoming interface < hh_len of
+	   outgoing interface */
+	nskb = skb_copy_expand(oldskb, hh_len, skb_tailroom(oldskb),
+			       GFP_ATOMIC);
+	if (!nskb) {
+		dst_release(&rt->u.dst);
+		return;
+	}
+
+	dst_release(nskb->dst);
+	nskb->dst = &rt->u.dst;
+
+	/* This packet will not be the same as the other: clear nf fields */
+	nf_reset(nskb);
+	nskb->nfcache = 0;
+	nskb->nfmark = 0;
+#ifdef CONFIG_BRIDGE_NETFILTER
+	nf_bridge_put(nskb->nf_bridge);
+	nskb->nf_bridge = NULL;
+#endif
+
+	tcph = (struct tcphdr *)((u_int32_t*)nskb->nh.iph + nskb->nh.iph->ihl);
+
+	/* Swap source and dest */
+	tmp_addr = nskb->nh.iph->saddr;
+	nskb->nh.iph->saddr = nskb->nh.iph->daddr;
+	nskb->nh.iph->daddr = tmp_addr;
+	tmp_port = tcph->source;
+	tcph->source = tcph->dest;
+	tcph->dest = tmp_port;
+
+	/* Truncate to length (no data) */
+	tcph->doff = sizeof(struct tcphdr)/4;
+	skb_trim(nskb, nskb->nh.iph->ihl*4 + sizeof(struct tcphdr));
+	nskb->nh.iph->tot_len = htons(nskb->len);
+
+	if (tcph->ack) {
+		needs_ack = 0;
+		tcph->seq = oth->ack_seq;
+		tcph->ack_seq = 0;
+	} else {
+		needs_ack = 1;
+		tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin
+				      + oldskb->len - oldskb->nh.iph->ihl*4
+				      - (oth->doff<<2));
+		tcph->seq = 0;
+	}
+
+	/* Reset flags */
+	((u_int8_t *)tcph)[13] = 0;
+	tcph->rst = 1;
+	tcph->ack = needs_ack;
+
+	tcph->window = 0;
+	tcph->urg_ptr = 0;
+
+	/* Adjust TCP checksum */
+	tcph->check = 0;
+	tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr),
+				   nskb->nh.iph->saddr,
+				   nskb->nh.iph->daddr,
+				   csum_partial((char *)tcph,
+						sizeof(struct tcphdr), 0));
+
+	/* Adjust IP TTL, DF */
+	nskb->nh.iph->ttl = MAXTTL;
+	/* Set DF, id = 0 */
+	nskb->nh.iph->frag_off = htons(IP_DF);
+	nskb->nh.iph->id = 0;
+
+	/* Adjust IP checksum */
+	nskb->nh.iph->check = 0;
+	nskb->nh.iph->check = ip_fast_csum((unsigned char *)nskb->nh.iph, 
+					   nskb->nh.iph->ihl);
+
+	/* "Never happens" */
+	if (nskb->len > dst_mtu(nskb->dst))
+		goto free_nskb;
+
+	nf_ct_attach(nskb, oldskb);
+
+	NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
+		dst_output);
+	return;
+
+ free_nskb:
+	kfree_skb(nskb);
+}
+
+static inline void send_unreach(struct sk_buff *skb_in, int code)
+{
+	icmp_send(skb_in, ICMP_DEST_UNREACH, code, 0);
+}	
+
+static unsigned int reject(struct sk_buff **pskb,
+			   const struct net_device *in,
+			   const struct net_device *out,
+			   unsigned int hooknum,
+			   const void *targinfo,
+			   void *userinfo)
+{
+	const struct ipt_reject_info *reject = targinfo;
+
+	/* Our naive response construction doesn't deal with IP
+           options, and probably shouldn't try. */
+	if ((*pskb)->nh.iph->ihl<<2 != sizeof(struct iphdr))
+		return NF_DROP;
+
+	/* WARNING: This code causes reentry within iptables.
+	   This means that the iptables jump stack is now crap.  We
+	   must return an absolute verdict. --RR */
+    	switch (reject->with) {
+    	case IPT_ICMP_NET_UNREACHABLE:
+    		send_unreach(*pskb, ICMP_NET_UNREACH);
+    		break;
+    	case IPT_ICMP_HOST_UNREACHABLE:
+    		send_unreach(*pskb, ICMP_HOST_UNREACH);
+    		break;
+    	case IPT_ICMP_PROT_UNREACHABLE:
+    		send_unreach(*pskb, ICMP_PROT_UNREACH);
+    		break;
+    	case IPT_ICMP_PORT_UNREACHABLE:
+    		send_unreach(*pskb, ICMP_PORT_UNREACH);
+    		break;
+    	case IPT_ICMP_NET_PROHIBITED:
+    		send_unreach(*pskb, ICMP_NET_ANO);
+    		break;
+	case IPT_ICMP_HOST_PROHIBITED:
+    		send_unreach(*pskb, ICMP_HOST_ANO);
+    		break;
+    	case IPT_ICMP_ADMIN_PROHIBITED:
+		send_unreach(*pskb, ICMP_PKT_FILTERED);
+		break;
+	case IPT_TCP_RESET:
+		send_reset(*pskb, hooknum);
+	case IPT_ICMP_ECHOREPLY:
+		/* Doesn't happen. */
+		break;
+	}
+
+	return NF_DROP;
+}
+
+static int check(const char *tablename,
+		 const struct ipt_entry *e,
+		 void *targinfo,
+		 unsigned int targinfosize,
+		 unsigned int hook_mask)
+{
+ 	const struct ipt_reject_info *rejinfo = targinfo;
+
+ 	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_reject_info))) {
+  		DEBUGP("REJECT: targinfosize %u != 0\n", targinfosize);
+  		return 0;
+  	}
+
+	/* Only allow these for packet filtering. */
+	if (strcmp(tablename, "filter") != 0) {
+		DEBUGP("REJECT: bad table `%s'.\n", tablename);
+		return 0;
+	}
+	if ((hook_mask & ~((1 << NF_IP_LOCAL_IN)
+			   | (1 << NF_IP_FORWARD)
+			   | (1 << NF_IP_LOCAL_OUT))) != 0) {
+		DEBUGP("REJECT: bad hook mask %X\n", hook_mask);
+		return 0;
+	}
+
+	if (rejinfo->with == IPT_ICMP_ECHOREPLY) {
+		printk("REJECT: ECHOREPLY no longer supported.\n");
+		return 0;
+	} else if (rejinfo->with == IPT_TCP_RESET) {
+		/* Must specify that it's a TCP packet */
+		if (e->ip.proto != IPPROTO_TCP
+		    || (e->ip.invflags & IPT_INV_PROTO)) {
+			DEBUGP("REJECT: TCP_RESET invalid for non-tcp\n");
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_reject_reg = {
+	.name		= "REJECT",
+	.target		= reject,
+	.checkentry	= check,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&ipt_reject_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_reject_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_SAME.c b/net/ipv4/netfilter/ipt_SAME.c
new file mode 100644
index 000000000000..7a0536d864ac
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_SAME.c
@@ -0,0 +1,211 @@
+/* Same.  Just like SNAT, only try to make the connections
+ * 	  between client A and server B always have the same source ip.
+ *
+ * (C) 2000 Paul `Rusty' Russell
+ * (C) 2001 Martin Josefsson
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 010320 Martin Josefsson <gandalf@wlug.westbo.se>
+ * 	* copied ipt_BALANCE.c to ipt_SAME.c and changed a few things.
+ * 010728 Martin Josefsson <gandalf@wlug.westbo.se>
+ * 	* added --nodst to not include destination-ip in new source
+ * 	  calculations.
+ *	* added some more sanity-checks.
+ * 010729 Martin Josefsson <gandalf@wlug.westbo.se>
+ * 	* fixed a buggy if-statement in same_check(), should have
+ * 	  used ntohl() but didn't.
+ * 	* added support for multiple ranges. IPT_SAME_MAX_RANGE is
+ * 	  defined in linux/include/linux/netfilter_ipv4/ipt_SAME.h
+ * 	  and is currently set to 10.
+ * 	* added support for 1-address range, nice to have now that
+ * 	  we have multiple ranges.
+ */
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/timer.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/netdevice.h>
+#include <linux/if.h>
+#include <linux/inetdevice.h>
+#include <net/protocol.h>
+#include <net/checksum.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ipt_SAME.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Martin Josefsson <gandalf@wlug.westbo.se>");
+MODULE_DESCRIPTION("iptables special SNAT module for consistent sourceip");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static int
+same_check(const char *tablename,
+	      const struct ipt_entry *e,
+	      void *targinfo,
+	      unsigned int targinfosize,
+	      unsigned int hook_mask)
+{
+	unsigned int count, countess, rangeip, index = 0;
+	struct ipt_same_info *mr = targinfo;
+
+	mr->ipnum = 0;
+
+	if (strcmp(tablename, "nat") != 0) {
+		DEBUGP("same_check: bad table `%s'.\n", tablename);
+		return 0;
+	}
+	if (targinfosize != IPT_ALIGN(sizeof(*mr))) {
+		DEBUGP("same_check: size %u.\n", targinfosize);
+		return 0;
+	}
+	if (hook_mask & ~(1 << NF_IP_PRE_ROUTING | 1 << NF_IP_POST_ROUTING)) {
+		DEBUGP("same_check: bad hooks %x.\n", hook_mask);
+		return 0;
+	}
+	if (mr->rangesize < 1) {
+		DEBUGP("same_check: need at least one dest range.\n");
+		return 0;
+	}
+	if (mr->rangesize > IPT_SAME_MAX_RANGE) {
+		DEBUGP("same_check: too many ranges specified, maximum "
+				"is %u ranges\n",
+				IPT_SAME_MAX_RANGE);
+		return 0;
+	}
+	for (count = 0; count < mr->rangesize; count++) {
+		if (ntohl(mr->range[count].min_ip) >
+				ntohl(mr->range[count].max_ip)) {
+			DEBUGP("same_check: min_ip is larger than max_ip in "
+				"range `%u.%u.%u.%u-%u.%u.%u.%u'.\n",
+				NIPQUAD(mr->range[count].min_ip),
+				NIPQUAD(mr->range[count].max_ip));
+			return 0;
+		}
+		if (!(mr->range[count].flags & IP_NAT_RANGE_MAP_IPS)) {
+			DEBUGP("same_check: bad MAP_IPS.\n");
+			return 0;
+		}
+		rangeip = (ntohl(mr->range[count].max_ip) - 
+					ntohl(mr->range[count].min_ip) + 1);
+		mr->ipnum += rangeip;
+		
+		DEBUGP("same_check: range %u, ipnum = %u\n", count, rangeip);
+	}
+	DEBUGP("same_check: total ipaddresses = %u\n", mr->ipnum);
+	
+	mr->iparray = kmalloc((sizeof(u_int32_t) * mr->ipnum), GFP_KERNEL);
+	if (!mr->iparray) {
+		DEBUGP("same_check: Couldn't allocate %u bytes "
+			"for %u ipaddresses!\n", 
+			(sizeof(u_int32_t) * mr->ipnum), mr->ipnum);
+		return 0;
+	}
+	DEBUGP("same_check: Allocated %u bytes for %u ipaddresses.\n",
+			(sizeof(u_int32_t) * mr->ipnum), mr->ipnum);
+	
+	for (count = 0; count < mr->rangesize; count++) {
+		for (countess = ntohl(mr->range[count].min_ip);
+				countess <= ntohl(mr->range[count].max_ip);
+					countess++) {
+			mr->iparray[index] = countess;
+			DEBUGP("same_check: Added ipaddress `%u.%u.%u.%u' "
+				"in index %u.\n",
+				HIPQUAD(countess), index);
+			index++;
+		}
+	}
+	return 1;
+}
+
+static void 
+same_destroy(void *targinfo,
+		unsigned int targinfosize)
+{
+	struct ipt_same_info *mr = targinfo;
+
+	kfree(mr->iparray);
+	
+	DEBUGP("same_destroy: Deallocated %u bytes for %u ipaddresses.\n",
+			(sizeof(u_int32_t) * mr->ipnum), mr->ipnum);
+}
+
+static unsigned int
+same_target(struct sk_buff **pskb,
+		const struct net_device *in,
+		const struct net_device *out,
+		unsigned int hooknum,
+		const void *targinfo,
+		void *userinfo)
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	u_int32_t tmpip, aindex, new_ip;
+	const struct ipt_same_info *same = targinfo;
+	struct ip_nat_range newrange;
+	const struct ip_conntrack_tuple *t;
+
+	IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING ||
+			hooknum == NF_IP_POST_ROUTING);
+	ct = ip_conntrack_get(*pskb, &ctinfo);
+
+	t = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+
+	/* Base new source on real src ip and optionally dst ip,
+	   giving some hope for consistency across reboots.
+	   Here we calculate the index in same->iparray which
+	   holds the ipaddress we should use */
+	
+	tmpip = ntohl(t->src.ip);
+
+	if (!(same->info & IPT_SAME_NODST))
+		tmpip += ntohl(t->dst.ip);
+	
+	aindex = tmpip % same->ipnum;
+
+	new_ip = htonl(same->iparray[aindex]);
+
+	DEBUGP("ipt_SAME: src=%u.%u.%u.%u dst=%u.%u.%u.%u, "
+			"new src=%u.%u.%u.%u\n",
+			NIPQUAD(t->src.ip), NIPQUAD(t->dst.ip),
+			NIPQUAD(new_ip));
+
+	/* Transfer from original range. */
+	newrange = ((struct ip_nat_range)
+		{ same->range[0].flags, new_ip, new_ip,
+		  /* FIXME: Use ports from correct range! */
+		  same->range[0].min, same->range[0].max });
+
+	/* Hand modified range to generic setup. */
+	return ip_nat_setup_info(ct, &newrange, hooknum);
+}
+
+static struct ipt_target same_reg = { 
+	.name		= "SAME",
+	.target		= same_target,
+	.checkentry	= same_check,
+	.destroy	= same_destroy,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&same_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&same_reg);
+}
+
+module_init(init);
+module_exit(fini);
+
diff --git a/net/ipv4/netfilter/ipt_TCPMSS.c b/net/ipv4/netfilter/ipt_TCPMSS.c
new file mode 100644
index 000000000000..1049050b2bfb
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_TCPMSS.c
@@ -0,0 +1,262 @@
+/*
+ * This is a module which is used for setting the MSS option in TCP packets.
+ *
+ * Copyright (C) 2000 Marc Boucher <marc@mbsi.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/ip.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_TCPMSS.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("iptables TCP MSS modification module");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static u_int16_t
+cheat_check(u_int32_t oldvalinv, u_int32_t newval, u_int16_t oldcheck)
+{
+	u_int32_t diffs[] = { oldvalinv, newval };
+	return csum_fold(csum_partial((char *)diffs, sizeof(diffs),
+                                      oldcheck^0xFFFF));
+}
+
+static inline unsigned int
+optlen(const u_int8_t *opt, unsigned int offset)
+{
+	/* Beware zero-length options: make finite progress */
+	if (opt[offset] <= TCPOPT_NOP || opt[offset+1] == 0) return 1;
+	else return opt[offset+1];
+}
+
+static unsigned int
+ipt_tcpmss_target(struct sk_buff **pskb,
+		  const struct net_device *in,
+		  const struct net_device *out,
+		  unsigned int hooknum,
+		  const void *targinfo,
+		  void *userinfo)
+{
+	const struct ipt_tcpmss_info *tcpmssinfo = targinfo;
+	struct tcphdr *tcph;
+	struct iphdr *iph;
+	u_int16_t tcplen, newtotlen, oldval, newmss;
+	unsigned int i;
+	u_int8_t *opt;
+
+	if (!skb_ip_make_writable(pskb, (*pskb)->len))
+		return NF_DROP;
+
+	iph = (*pskb)->nh.iph;
+	tcplen = (*pskb)->len - iph->ihl*4;
+
+	tcph = (void *)iph + iph->ihl*4;
+
+	/* Since it passed flags test in tcp match, we know it is is
+	   not a fragment, and has data >= tcp header length.  SYN
+	   packets should not contain data: if they did, then we risk
+	   running over MTU, sending Frag Needed and breaking things
+	   badly. --RR */
+	if (tcplen != tcph->doff*4) {
+		if (net_ratelimit())
+			printk(KERN_ERR
+			       "ipt_tcpmss_target: bad length (%d bytes)\n",
+			       (*pskb)->len);
+		return NF_DROP;
+	}
+
+	if(tcpmssinfo->mss == IPT_TCPMSS_CLAMP_PMTU) {
+		if(!(*pskb)->dst) {
+			if (net_ratelimit())
+				printk(KERN_ERR
+			       		"ipt_tcpmss_target: no dst?! can't determine path-MTU\n");
+			return NF_DROP; /* or IPT_CONTINUE ?? */
+		}
+
+		if(dst_mtu((*pskb)->dst) <= (sizeof(struct iphdr) + sizeof(struct tcphdr))) {
+			if (net_ratelimit())
+				printk(KERN_ERR
+		       			"ipt_tcpmss_target: unknown or invalid path-MTU (%d)\n", dst_mtu((*pskb)->dst));
+			return NF_DROP; /* or IPT_CONTINUE ?? */
+		}
+
+		newmss = dst_mtu((*pskb)->dst) - sizeof(struct iphdr) - sizeof(struct tcphdr);
+	} else
+		newmss = tcpmssinfo->mss;
+
+ 	opt = (u_int8_t *)tcph;
+	for (i = sizeof(struct tcphdr); i < tcph->doff*4; i += optlen(opt, i)){
+		if ((opt[i] == TCPOPT_MSS) &&
+		    ((tcph->doff*4 - i) >= TCPOLEN_MSS) &&
+		    (opt[i+1] == TCPOLEN_MSS)) {
+			u_int16_t oldmss;
+
+			oldmss = (opt[i+2] << 8) | opt[i+3];
+
+			if((tcpmssinfo->mss == IPT_TCPMSS_CLAMP_PMTU) &&
+				(oldmss <= newmss))
+					return IPT_CONTINUE;
+
+			opt[i+2] = (newmss & 0xff00) >> 8;
+			opt[i+3] = (newmss & 0x00ff);
+
+			tcph->check = cheat_check(htons(oldmss)^0xFFFF,
+						  htons(newmss),
+						  tcph->check);
+
+			DEBUGP(KERN_INFO "ipt_tcpmss_target: %u.%u.%u.%u:%hu"
+			       "->%u.%u.%u.%u:%hu changed TCP MSS option"
+			       " (from %u to %u)\n", 
+			       NIPQUAD((*pskb)->nh.iph->saddr),
+			       ntohs(tcph->source),
+			       NIPQUAD((*pskb)->nh.iph->daddr),
+			       ntohs(tcph->dest),
+			       oldmss, newmss);
+			goto retmodified;
+		}
+	}
+
+	/*
+	 * MSS Option not found ?! add it..
+	 */
+	if (skb_tailroom((*pskb)) < TCPOLEN_MSS) {
+		struct sk_buff *newskb;
+
+		newskb = skb_copy_expand(*pskb, skb_headroom(*pskb),
+					 TCPOLEN_MSS, GFP_ATOMIC);
+		if (!newskb) {
+			if (net_ratelimit())
+				printk(KERN_ERR "ipt_tcpmss_target:"
+				       " unable to allocate larger skb\n");
+			return NF_DROP;
+		}
+
+		kfree_skb(*pskb);
+		*pskb = newskb;
+		iph = (*pskb)->nh.iph;
+		tcph = (void *)iph + iph->ihl*4;
+	}
+
+	skb_put((*pskb), TCPOLEN_MSS);
+
+ 	opt = (u_int8_t *)tcph + sizeof(struct tcphdr);
+	memmove(opt + TCPOLEN_MSS, opt, tcplen - sizeof(struct tcphdr));
+
+	tcph->check = cheat_check(htons(tcplen) ^ 0xFFFF,
+				  htons(tcplen + TCPOLEN_MSS), tcph->check);
+	tcplen += TCPOLEN_MSS;
+
+	opt[0] = TCPOPT_MSS;
+	opt[1] = TCPOLEN_MSS;
+	opt[2] = (newmss & 0xff00) >> 8;
+	opt[3] = (newmss & 0x00ff);
+
+	tcph->check = cheat_check(~0, *((u_int32_t *)opt), tcph->check);
+
+	oldval = ((u_int16_t *)tcph)[6];
+	tcph->doff += TCPOLEN_MSS/4;
+	tcph->check = cheat_check(oldval ^ 0xFFFF,
+				  ((u_int16_t *)tcph)[6], tcph->check);
+
+	newtotlen = htons(ntohs(iph->tot_len) + TCPOLEN_MSS);
+	iph->check = cheat_check(iph->tot_len ^ 0xFFFF,
+				 newtotlen, iph->check);
+	iph->tot_len = newtotlen;
+
+	DEBUGP(KERN_INFO "ipt_tcpmss_target: %u.%u.%u.%u:%hu"
+	       "->%u.%u.%u.%u:%hu added TCP MSS option (%u)\n",
+	       NIPQUAD((*pskb)->nh.iph->saddr),
+	       ntohs(tcph->source),
+	       NIPQUAD((*pskb)->nh.iph->daddr),
+	       ntohs(tcph->dest),
+	       newmss);
+
+ retmodified:
+	/* We never hw checksum SYN packets.  */
+	BUG_ON((*pskb)->ip_summed == CHECKSUM_HW);
+
+	(*pskb)->nfcache |= NFC_UNKNOWN | NFC_ALTERED;
+	return IPT_CONTINUE;
+}
+
+#define TH_SYN 0x02
+
+static inline int find_syn_match(const struct ipt_entry_match *m)
+{
+	const struct ipt_tcp *tcpinfo = (const struct ipt_tcp *)m->data;
+
+	if (strcmp(m->u.kernel.match->name, "tcp") == 0
+	    && (tcpinfo->flg_cmp & TH_SYN)
+	    && !(tcpinfo->invflags & IPT_TCP_INV_FLAGS))
+		return 1;
+
+	return 0;
+}
+
+/* Must specify -p tcp --syn/--tcp-flags SYN */
+static int
+ipt_tcpmss_checkentry(const char *tablename,
+		      const struct ipt_entry *e,
+		      void *targinfo,
+		      unsigned int targinfosize,
+		      unsigned int hook_mask)
+{
+	const struct ipt_tcpmss_info *tcpmssinfo = targinfo;
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_tcpmss_info))) {
+		DEBUGP("ipt_tcpmss_checkentry: targinfosize %u != %u\n",
+		       targinfosize, IPT_ALIGN(sizeof(struct ipt_tcpmss_info)));
+		return 0;
+	}
+
+
+	if((tcpmssinfo->mss == IPT_TCPMSS_CLAMP_PMTU) && 
+			((hook_mask & ~((1 << NF_IP_FORWARD)
+			   	| (1 << NF_IP_LOCAL_OUT)
+			   	| (1 << NF_IP_POST_ROUTING))) != 0)) {
+		printk("TCPMSS: path-MTU clamping only supported in FORWARD, OUTPUT and POSTROUTING hooks\n");
+		return 0;
+	}
+
+	if (e->ip.proto == IPPROTO_TCP
+	    && !(e->ip.invflags & IPT_INV_PROTO)
+	    && IPT_MATCH_ITERATE(e, find_syn_match))
+		return 1;
+
+	printk("TCPMSS: Only works on TCP SYN packets\n");
+	return 0;
+}
+
+static struct ipt_target ipt_tcpmss_reg = {
+	.name		= "TCPMSS",
+	.target		= ipt_tcpmss_target,
+	.checkentry	= ipt_tcpmss_checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&ipt_tcpmss_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_tcpmss_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_TOS.c b/net/ipv4/netfilter/ipt_TOS.c
new file mode 100644
index 000000000000..85c70d240f8b
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_TOS.c
@@ -0,0 +1,105 @@
+/* This is a module which is used for setting the TOS field of a packet. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_TOS.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables TOS mangling module");
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
+{
+	const struct ipt_tos_target_info *tosinfo = targinfo;
+
+	if (((*pskb)->nh.iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
+		u_int16_t diffs[2];
+
+		if (!skb_ip_make_writable(pskb, sizeof(struct iphdr)))
+			return NF_DROP;
+
+		diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;
+		(*pskb)->nh.iph->tos
+			= ((*pskb)->nh.iph->tos & IPTOS_PREC_MASK)
+			| tosinfo->tos;
+		diffs[1] = htons((*pskb)->nh.iph->tos);
+		(*pskb)->nh.iph->check
+			= csum_fold(csum_partial((char *)diffs,
+						 sizeof(diffs),
+						 (*pskb)->nh.iph->check
+						 ^0xFFFF));
+		(*pskb)->nfcache |= NFC_ALTERED;
+	}
+	return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
+           unsigned int hook_mask)
+{
+	const u_int8_t tos = ((struct ipt_tos_target_info *)targinfo)->tos;
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_tos_target_info))) {
+		printk(KERN_WARNING "TOS: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_tos_target_info)));
+		return 0;
+	}
+
+	if (strcmp(tablename, "mangle") != 0) {
+		printk(KERN_WARNING "TOS: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+		return 0;
+	}
+
+	if (tos != IPTOS_LOWDELAY
+	    && tos != IPTOS_THROUGHPUT
+	    && tos != IPTOS_RELIABILITY
+	    && tos != IPTOS_MINCOST
+	    && tos != IPTOS_NORMALSVC) {
+		printk(KERN_WARNING "TOS: bad tos value %#x\n", tos);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_tos_reg = {
+	.name		= "TOS",
+	.target		= target,
+	.checkentry	= checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_target(&ipt_tos_reg);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_target(&ipt_tos_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c
new file mode 100644
index 000000000000..6f2cefbe16cd
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_ULOG.c
@@ -0,0 +1,419 @@
+/*
+ * netfilter module for userspace packet logging daemons
+ *
+ * (C) 2000-2004 by Harald Welte <laforge@netfilter.org>
+ *
+ * 2000/09/22 ulog-cprange feature added
+ * 2001/01/04 in-kernel queue as proposed by Sebastian Zander 
+ * 						<zander@fokus.gmd.de>
+ * 2001/01/30 per-rule nlgroup conflicts with global queue. 
+ *            nlgroup now global (sysctl)
+ * 2001/04/19 ulog-queue reworked, now fixed buffer size specified at
+ * 	      module loadtime -HW
+ * 2002/07/07 remove broken nflog_rcv() function -HW
+ * 2002/08/29 fix shifted/unshifted nlgroup bug -HW
+ * 2002/10/30 fix uninitialized mac_len field - <Anders K. Pedersen>
+ * 2004/10/25 fix erroneous calculation of 'len' parameter to NLMSG_PUT
+ *	      resulting in bogus 'error during NLMSG_PUT' messages.
+ *
+ * (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This module accepts two parameters: 
+ * 
+ * nlbufsiz:
+ *   The parameter specifies how big the buffer for each netlink multicast
+ * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
+ * get accumulated in the kernel until they are sent to userspace. It is
+ * NOT possible to allocate more than 128kB, and it is strongly discouraged,
+ * because atomically allocating 128kB inside the network rx softirq is not
+ * reliable. Please also keep in mind that this buffer size is allocated for
+ * each nlgroup you are using, so the total kernel memory usage increases
+ * by that factor.
+ *
+ * flushtimeout:
+ *   Specify, after how many hundredths of a second the queue should be
+ *   flushed even if it is not full yet.
+ *
+ * ipt_ULOG.c,v 1.22 2002/10/30 09:07:31 laforge Exp
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/spinlock.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/netlink.h>
+#include <linux/netdevice.h>
+#include <linux/mm.h>
+#include <linux/moduleparam.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ULOG.h>
+#include <linux/netfilter_ipv4/lockhelp.h>
+#include <net/sock.h>
+#include <linux/bitops.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("iptables userspace logging module");
+
+#define ULOG_NL_EVENT		111		/* Harald's favorite number */
+#define ULOG_MAXNLGROUPS	32		/* numer of nlgroups */
+
+#if 0
+#define DEBUGP(format, args...) printk("%s:%s:" format, \
+                                       __FILE__, __FUNCTION__ , ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#define PRINTR(format, args...) do { if (net_ratelimit()) printk(format , ## args); } while (0)
+
+static unsigned int nlbufsiz = 4096;
+module_param(nlbufsiz, uint, 0600); /* FIXME: Check size < 128k --RR */
+MODULE_PARM_DESC(nlbufsiz, "netlink buffer size");
+
+static unsigned int flushtimeout = 10;
+module_param(flushtimeout, int, 0600);
+MODULE_PARM_DESC(flushtimeout, "buffer flush timeout (hundredths of a second)");
+
+static unsigned int nflog = 1;
+module_param(nflog, int, 0400);
+MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
+
+/* global data structures */
+
+typedef struct {
+	unsigned int qlen;		/* number of nlmsgs' in the skb */
+	struct nlmsghdr *lastnlh;	/* netlink header of last msg in skb */
+	struct sk_buff *skb;		/* the pre-allocated skb */
+	struct timer_list timer;	/* the timer function */
+} ulog_buff_t;
+
+static ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS];	/* array of buffers */
+
+static struct sock *nflognl;	/* our socket */
+static DECLARE_LOCK(ulog_lock);	/* spinlock */
+
+/* send one ulog_buff_t to userspace */
+static void ulog_send(unsigned int nlgroupnum)
+{
+	ulog_buff_t *ub = &ulog_buffers[nlgroupnum];
+
+	if (timer_pending(&ub->timer)) {
+		DEBUGP("ipt_ULOG: ulog_send: timer was pending, deleting\n");
+		del_timer(&ub->timer);
+	}
+
+	/* last nlmsg needs NLMSG_DONE */
+	if (ub->qlen > 1)
+		ub->lastnlh->nlmsg_type = NLMSG_DONE;
+
+	NETLINK_CB(ub->skb).dst_groups = (1 << nlgroupnum);
+	DEBUGP("ipt_ULOG: throwing %d packets to netlink mask %u\n",
+		ub->qlen, nlgroupnum);
+	netlink_broadcast(nflognl, ub->skb, 0, (1 << nlgroupnum), GFP_ATOMIC);
+
+	ub->qlen = 0;
+	ub->skb = NULL;
+	ub->lastnlh = NULL;
+
+}
+
+
+/* timer function to flush queue in flushtimeout time */
+static void ulog_timer(unsigned long data)
+{
+	DEBUGP("ipt_ULOG: timer function called, calling ulog_send\n");
+
+	/* lock to protect against somebody modifying our structure
+	 * from ipt_ulog_target at the same time */
+	LOCK_BH(&ulog_lock);
+	ulog_send(data);
+	UNLOCK_BH(&ulog_lock);
+}
+
+static struct sk_buff *ulog_alloc_skb(unsigned int size)
+{
+	struct sk_buff *skb;
+
+	/* alloc skb which should be big enough for a whole
+	 * multipart message. WARNING: has to be <= 131000
+	 * due to slab allocator restrictions */
+
+	skb = alloc_skb(nlbufsiz, GFP_ATOMIC);
+	if (!skb) {
+		PRINTR("ipt_ULOG: can't alloc whole buffer %ub!\n",
+			nlbufsiz);
+
+		/* try to allocate only as much as we need for 
+		 * current packet */
+
+		skb = alloc_skb(size, GFP_ATOMIC);
+		if (!skb)
+			PRINTR("ipt_ULOG: can't even allocate %ub\n", size);
+	}
+
+	return skb;
+}
+
+static void ipt_ulog_packet(unsigned int hooknum,
+			    const struct sk_buff *skb,
+			    const struct net_device *in,
+			    const struct net_device *out,
+			    const struct ipt_ulog_info *loginfo,
+			    const char *prefix)
+{
+	ulog_buff_t *ub;
+	ulog_packet_msg_t *pm;
+	size_t size, copy_len;
+	struct nlmsghdr *nlh;
+
+	/* ffs == find first bit set, necessary because userspace
+	 * is already shifting groupnumber, but we need unshifted.
+	 * ffs() returns [1..32], we need [0..31] */
+	unsigned int groupnum = ffs(loginfo->nl_group) - 1;
+
+	/* calculate the size of the skb needed */
+	if ((loginfo->copy_range == 0) ||
+	    (loginfo->copy_range > skb->len)) {
+		copy_len = skb->len;
+	} else {
+		copy_len = loginfo->copy_range;
+	}
+
+	size = NLMSG_SPACE(sizeof(*pm) + copy_len);
+
+	ub = &ulog_buffers[groupnum];
+	
+	LOCK_BH(&ulog_lock);
+
+	if (!ub->skb) {
+		if (!(ub->skb = ulog_alloc_skb(size)))
+			goto alloc_failure;
+	} else if (ub->qlen >= loginfo->qthreshold ||
+		   size > skb_tailroom(ub->skb)) {
+		/* either the queue len is too high or we don't have 
+		 * enough room in nlskb left. send it to userspace. */
+
+		ulog_send(groupnum);
+
+		if (!(ub->skb = ulog_alloc_skb(size)))
+			goto alloc_failure;
+	}
+
+	DEBUGP("ipt_ULOG: qlen %d, qthreshold %d\n", ub->qlen, 
+		loginfo->qthreshold);
+
+	/* NLMSG_PUT contains a hidden goto nlmsg_failure !!! */
+	nlh = NLMSG_PUT(ub->skb, 0, ub->qlen, ULOG_NL_EVENT, 
+			sizeof(*pm)+copy_len);
+	ub->qlen++;
+
+	pm = NLMSG_DATA(nlh);
+
+	/* We might not have a timestamp, get one */
+	if (skb->stamp.tv_sec == 0)
+		do_gettimeofday((struct timeval *)&skb->stamp);
+
+	/* copy hook, prefix, timestamp, payload, etc. */
+	pm->data_len = copy_len;
+	pm->timestamp_sec = skb->stamp.tv_sec;
+	pm->timestamp_usec = skb->stamp.tv_usec;
+	pm->mark = skb->nfmark;
+	pm->hook = hooknum;
+	if (prefix != NULL)
+		strncpy(pm->prefix, prefix, sizeof(pm->prefix));
+	else if (loginfo->prefix[0] != '\0')
+		strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix));
+	else
+		*(pm->prefix) = '\0';
+
+	if (in && in->hard_header_len > 0
+	    && skb->mac.raw != (void *) skb->nh.iph
+	    && in->hard_header_len <= ULOG_MAC_LEN) {
+		memcpy(pm->mac, skb->mac.raw, in->hard_header_len);
+		pm->mac_len = in->hard_header_len;
+	} else
+		pm->mac_len = 0;
+
+	if (in)
+		strncpy(pm->indev_name, in->name, sizeof(pm->indev_name));
+	else
+		pm->indev_name[0] = '\0';
+
+	if (out)
+		strncpy(pm->outdev_name, out->name, sizeof(pm->outdev_name));
+	else
+		pm->outdev_name[0] = '\0';
+
+	/* copy_len <= skb->len, so can't fail. */
+	if (skb_copy_bits(skb, 0, pm->payload, copy_len) < 0)
+		BUG();
+	
+	/* check if we are building multi-part messages */
+	if (ub->qlen > 1) {
+		ub->lastnlh->nlmsg_flags |= NLM_F_MULTI;
+	}
+
+	ub->lastnlh = nlh;
+
+	/* if timer isn't already running, start it */
+	if (!timer_pending(&ub->timer)) {
+		ub->timer.expires = jiffies + flushtimeout * HZ / 100;
+		add_timer(&ub->timer);
+	}
+
+	/* if threshold is reached, send message to userspace */
+	if (ub->qlen >= loginfo->qthreshold) {
+		if (loginfo->qthreshold > 1)
+			nlh->nlmsg_type = NLMSG_DONE;
+		ulog_send(groupnum);
+	}
+
+	UNLOCK_BH(&ulog_lock);
+
+	return;
+
+nlmsg_failure:
+	PRINTR("ipt_ULOG: error during NLMSG_PUT\n");
+
+alloc_failure:
+	PRINTR("ipt_ULOG: Error building netlink message\n");
+
+	UNLOCK_BH(&ulog_lock);
+}
+
+static unsigned int ipt_ulog_target(struct sk_buff **pskb,
+				    const struct net_device *in,
+				    const struct net_device *out,
+				    unsigned int hooknum,
+				    const void *targinfo, void *userinfo)
+{
+	struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *) targinfo;
+
+	ipt_ulog_packet(hooknum, *pskb, in, out, loginfo, NULL);
+ 
+ 	return IPT_CONTINUE;
+}
+ 
+static void ipt_logfn(unsigned int hooknum,
+		      const struct sk_buff *skb,
+		      const struct net_device *in,
+		      const struct net_device *out,
+		      const char *prefix)
+{
+	struct ipt_ulog_info loginfo = { 
+		.nl_group = ULOG_DEFAULT_NLGROUP,
+		.copy_range = 0,
+		.qthreshold = ULOG_DEFAULT_QTHRESHOLD,
+		.prefix = ""
+	};
+
+	ipt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix);
+}
+
+static int ipt_ulog_checkentry(const char *tablename,
+			       const struct ipt_entry *e,
+			       void *targinfo,
+			       unsigned int targinfosize,
+			       unsigned int hookmask)
+{
+	struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *) targinfo;
+
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_ulog_info))) {
+		DEBUGP("ipt_ULOG: targinfosize %u != 0\n", targinfosize);
+		return 0;
+	}
+
+	if (loginfo->prefix[sizeof(loginfo->prefix) - 1] != '\0') {
+		DEBUGP("ipt_ULOG: prefix term %i\n",
+		       loginfo->prefix[sizeof(loginfo->prefix) - 1]);
+		return 0;
+	}
+
+	if (loginfo->qthreshold > ULOG_MAX_QLEN) {
+		DEBUGP("ipt_ULOG: queue threshold %i > MAX_QLEN\n",
+			loginfo->qthreshold);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_target ipt_ulog_reg = {
+	.name		= "ULOG",
+	.target		= ipt_ulog_target,
+	.checkentry	= ipt_ulog_checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	int i;
+
+	DEBUGP("ipt_ULOG: init module\n");
+
+	if (nlbufsiz >= 128*1024) {
+		printk("Netlink buffer has to be <= 128kB\n");
+		return -EINVAL;
+	}
+
+	/* initialize ulog_buffers */
+	for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
+		init_timer(&ulog_buffers[i].timer);
+		ulog_buffers[i].timer.function = ulog_timer;
+		ulog_buffers[i].timer.data = i;
+	}
+
+	nflognl = netlink_kernel_create(NETLINK_NFLOG, NULL);
+	if (!nflognl)
+		return -ENOMEM;
+
+	if (ipt_register_target(&ipt_ulog_reg) != 0) {
+		sock_release(nflognl->sk_socket);
+		return -EINVAL;
+	}
+	if (nflog)
+		nf_log_register(PF_INET, &ipt_logfn);
+	
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	ulog_buff_t *ub;
+	int i;
+
+	DEBUGP("ipt_ULOG: cleanup_module\n");
+
+	if (nflog)
+		nf_log_unregister(PF_INET, &ipt_logfn);
+	ipt_unregister_target(&ipt_ulog_reg);
+	sock_release(nflognl->sk_socket);
+
+	/* remove pending timers and free allocated skb's */
+	for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
+		ub = &ulog_buffers[i];
+		if (timer_pending(&ub->timer)) {
+			DEBUGP("timer was pending, deleting\n");
+			del_timer(&ub->timer);
+		}
+
+		if (ub->skb) {
+			kfree_skb(ub->skb);
+			ub->skb = NULL;
+		}
+	}
+
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_addrtype.c b/net/ipv4/netfilter/ipt_addrtype.c
new file mode 100644
index 000000000000..f5909a4c3fc7
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_addrtype.c
@@ -0,0 +1,77 @@
+/*
+ *  iptables module to match inet_addr_type() of an ip.
+ *
+ *  Copyright (c) 2004 Patrick McHardy <kaber@trash.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/ip.h>
+#include <net/route.h>
+
+#include <linux/netfilter_ipv4/ipt_addrtype.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_DESCRIPTION("iptables addrtype match");
+
+static inline int match_type(u_int32_t addr, u_int16_t mask)
+{
+	return !!(mask & (1 << inet_addr_type(addr)));
+}
+
+static int match(const struct sk_buff *skb, const struct net_device *in,
+		 const struct net_device *out, const void *matchinfo,
+		 int offset, int *hotdrop)
+{
+	const struct ipt_addrtype_info *info = matchinfo;
+	const struct iphdr *iph = skb->nh.iph;
+	int ret = 1;
+
+	if (info->source)
+		ret &= match_type(iph->saddr, info->source)^info->invert_source;
+	if (info->dest)
+		ret &= match_type(iph->daddr, info->dest)^info->invert_dest;
+	
+	return ret;
+}
+
+static int checkentry(const char *tablename, const struct ipt_ip *ip,
+		      void *matchinfo, unsigned int matchsize,
+		      unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_addrtype_info))) {
+		printk(KERN_ERR "ipt_addrtype: invalid size (%u != %Zu)\n.",
+		       matchsize, IPT_ALIGN(sizeof(struct ipt_addrtype_info)));
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_match addrtype_match = {
+	.name		= "addrtype",
+	.match		= match,
+	.checkentry	= checkentry,
+	.me		= THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&addrtype_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&addrtype_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_ah.c b/net/ipv4/netfilter/ipt_ah.c
new file mode 100644
index 000000000000..a0fea847cb72
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_ah.c
@@ -0,0 +1,117 @@
+/* Kernel module to match AH parameters. */
+/* (C) 1999-2000 Yon Uriarte <yon@astaro.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+
+#include <linux/netfilter_ipv4/ipt_ah.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yon Uriarte <yon@astaro.de>");
+MODULE_DESCRIPTION("iptables AH SPI match module");
+
+#ifdef DEBUG_CONNTRACK
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+/* Returns 1 if the spi is matched by the range, 0 otherwise */
+static inline int
+spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
+{
+	int r=0;
+        duprintf("ah spi_match:%c 0x%x <= 0x%x <= 0x%x",invert? '!':' ',
+        	min,spi,max);
+	r=(spi >= min && spi <= max) ^ invert;
+	duprintf(" result %s\n",r? "PASS" : "FAILED");
+	return r;
+}
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	struct ip_auth_hdr _ahdr, *ah;
+	const struct ipt_ah *ahinfo = matchinfo;
+
+	/* Must not be a fragment. */
+	if (offset)
+		return 0;
+
+	ah = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
+				sizeof(_ahdr), &_ahdr);
+	if (ah == NULL) {
+		/* We've been asked to examine this packet, and we
+		 * can't.  Hence, no choice but to drop.
+		 */
+		duprintf("Dropping evil AH tinygram.\n");
+		*hotdrop = 1;
+		return 0;
+	}
+
+	return spi_match(ahinfo->spis[0], ahinfo->spis[1],
+			 ntohl(ah->spi),
+			 !!(ahinfo->invflags & IPT_AH_INV_SPI));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+checkentry(const char *tablename,
+	   const struct ipt_ip *ip,
+	   void *matchinfo,
+	   unsigned int matchinfosize,
+	   unsigned int hook_mask)
+{
+	const struct ipt_ah *ahinfo = matchinfo;
+
+	/* Must specify proto == AH, and no unknown invflags */
+	if (ip->proto != IPPROTO_AH || (ip->invflags & IPT_INV_PROTO)) {
+		duprintf("ipt_ah: Protocol %u != %u\n", ip->proto,
+			 IPPROTO_AH);
+		return 0;
+	}
+	if (matchinfosize != IPT_ALIGN(sizeof(struct ipt_ah))) {
+		duprintf("ipt_ah: matchsize %u != %u\n",
+			 matchinfosize, IPT_ALIGN(sizeof(struct ipt_ah)));
+		return 0;
+	}
+	if (ahinfo->invflags & ~IPT_AH_INV_MASK) {
+		duprintf("ipt_ah: unknown flags %X\n",
+			 ahinfo->invflags);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_match ah_match = {
+	.name		= "ah",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&ah_match);
+}
+
+static void __exit cleanup(void)
+{
+	ipt_unregister_match(&ah_match);
+}
+
+module_init(init);
+module_exit(cleanup);
diff --git a/net/ipv4/netfilter/ipt_comment.c b/net/ipv4/netfilter/ipt_comment.c
new file mode 100644
index 000000000000..6b76a1ea5245
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_comment.c
@@ -0,0 +1,59 @@
+/*
+ * Implements a dummy match to allow attaching comments to rules
+ *
+ * 2003-05-13 Brad Fisher (brad@info-link.net)
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_comment.h>
+
+MODULE_AUTHOR("Brad Fisher <brad@info-link.net>");
+MODULE_DESCRIPTION("iptables comment match module");
+MODULE_LICENSE("GPL");
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	/* We always match */
+	return 1;
+}
+
+static int
+checkentry(const char *tablename,
+           const struct ipt_ip *ip,
+           void *matchinfo,
+           unsigned int matchsize,
+           unsigned int hook_mask)
+{
+	/* Check the size */
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_comment_info)))
+		return 0;
+	return 1;
+}
+
+static struct ipt_match comment_match = {
+	.name		= "comment",
+	.match		= match,
+	.checkentry	= checkentry,
+	.me		= THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&comment_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&comment_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_connmark.c b/net/ipv4/netfilter/ipt_connmark.c
new file mode 100644
index 000000000000..2706f96cea55
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_connmark.c
@@ -0,0 +1,81 @@
+/* This kernel module matches connection mark values set by the
+ * CONNMARK target
+ *
+ * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
+MODULE_DESCRIPTION("IP tables connmark match module");
+MODULE_LICENSE("GPL");
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_connmark.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_connmark_info *info = matchinfo;
+	enum ip_conntrack_info ctinfo;
+	struct ip_conntrack *ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
+	if (!ct)
+		return 0;
+
+	return ((ct->mark & info->mask) == info->mark) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_ip *ip,
+	   void *matchinfo,
+	   unsigned int matchsize,
+	   unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_connmark_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match connmark_match = {
+	.name = "connmark",
+	.match = &match,
+	.checkentry = &checkentry,
+	.me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&connmark_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&connmark_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_conntrack.c b/net/ipv4/netfilter/ipt_conntrack.c
new file mode 100644
index 000000000000..c1d22801b7cf
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_conntrack.c
@@ -0,0 +1,136 @@
+/* Kernel module to match connection tracking information.
+ * Superset of Rusty's minimalistic state match.
+ *
+ * (C) 2001  Marc Boucher (marc@mbsi.ca).
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_conntrack.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("iptables connection tracking match module");
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_conntrack_info *sinfo = matchinfo;
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	unsigned int statebit;
+
+	ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
+
+#define FWINV(bool,invflg) ((bool) ^ !!(sinfo->invflags & invflg))
+
+	if (ct == &ip_conntrack_untracked)
+		statebit = IPT_CONNTRACK_STATE_UNTRACKED;
+	else if (ct)
+ 		statebit = IPT_CONNTRACK_STATE_BIT(ctinfo);
+ 	else
+ 		statebit = IPT_CONNTRACK_STATE_INVALID;
+ 
+	if(sinfo->flags & IPT_CONNTRACK_STATE) {
+		if (ct) {
+			if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip !=
+			    ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip)
+				statebit |= IPT_CONNTRACK_STATE_SNAT;
+
+			if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip !=
+			    ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip)
+				statebit |= IPT_CONNTRACK_STATE_DNAT;
+		}
+
+		if (FWINV((statebit & sinfo->statemask) == 0, IPT_CONNTRACK_STATE))
+			return 0;
+	}
+
+	if(sinfo->flags & IPT_CONNTRACK_PROTO) {
+		if (!ct || FWINV(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum, IPT_CONNTRACK_PROTO))
+                	return 0;
+	}
+
+	if(sinfo->flags & IPT_CONNTRACK_ORIGSRC) {
+		if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip&sinfo->sipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip, IPT_CONNTRACK_ORIGSRC))
+			return 0;
+	}
+
+	if(sinfo->flags & IPT_CONNTRACK_ORIGDST) {
+		if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip&sinfo->dipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip, IPT_CONNTRACK_ORIGDST))
+			return 0;
+	}
+
+	if(sinfo->flags & IPT_CONNTRACK_REPLSRC) {
+		if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip&sinfo->sipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].src.ip, IPT_CONNTRACK_REPLSRC))
+			return 0;
+	}
+
+	if(sinfo->flags & IPT_CONNTRACK_REPLDST) {
+		if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip&sinfo->dipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].dst.ip, IPT_CONNTRACK_REPLDST))
+			return 0;
+	}
+
+	if(sinfo->flags & IPT_CONNTRACK_STATUS) {
+		if (!ct || FWINV((ct->status & sinfo->statusmask) == 0, IPT_CONNTRACK_STATUS))
+			return 0;
+	}
+
+	if(sinfo->flags & IPT_CONNTRACK_EXPIRES) {
+		unsigned long expires;
+
+		if(!ct)
+			return 0;
+
+		expires = timer_pending(&ct->timeout) ? (ct->timeout.expires - jiffies)/HZ : 0;
+
+		if (FWINV(!(expires >= sinfo->expires_min && expires <= sinfo->expires_max), IPT_CONNTRACK_EXPIRES))
+			return 0;
+	}
+
+	return 1;
+}
+
+static int check(const char *tablename,
+		 const struct ipt_ip *ip,
+		 void *matchinfo,
+		 unsigned int matchsize,
+		 unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_conntrack_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match conntrack_match = {
+	.name		= "conntrack",
+	.match		= &match,
+	.checkentry	= &check,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	need_ip_conntrack();
+	return ipt_register_match(&conntrack_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&conntrack_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_dscp.c b/net/ipv4/netfilter/ipt_dscp.c
new file mode 100644
index 000000000000..5df52a64a5d4
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_dscp.c
@@ -0,0 +1,63 @@
+/* IP tables module for matching the value of the IPv4 DSCP field
+ *
+ * ipt_dscp.c,v 1.3 2002/08/05 19:00:21 laforge Exp
+ *
+ * (C) 2002 by Harald Welte <laforge@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ipt_dscp.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("iptables DSCP matching module");
+MODULE_LICENSE("GPL");
+
+static int match(const struct sk_buff *skb, const struct net_device *in,
+		 const struct net_device *out, const void *matchinfo,
+		 int offset, int *hotdrop)
+{
+	const struct ipt_dscp_info *info = matchinfo;
+	const struct iphdr *iph = skb->nh.iph;
+
+	u_int8_t sh_dscp = ((info->dscp << IPT_DSCP_SHIFT) & IPT_DSCP_MASK);
+
+	return ((iph->tos&IPT_DSCP_MASK) == sh_dscp) ^ info->invert;
+}
+
+static int checkentry(const char *tablename, const struct ipt_ip *ip,
+		      void *matchinfo, unsigned int matchsize,
+		      unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_dscp_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match dscp_match = {
+	.name		= "dscp",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&dscp_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&dscp_match);
+
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_ecn.c b/net/ipv4/netfilter/ipt_ecn.c
new file mode 100644
index 000000000000..b6f7181e89cc
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_ecn.c
@@ -0,0 +1,131 @@
+/* IP tables module for matching the value of the IPv4 and TCP ECN bits
+ *
+ * ipt_ecn.c,v 1.3 2002/05/29 15:09:00 laforge Exp
+ *
+ * (C) 2002 by Harald Welte <laforge@gnumonks.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/tcp.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ecn.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("iptables ECN matching module");
+MODULE_LICENSE("GPL");
+
+static inline int match_ip(const struct sk_buff *skb,
+			   const struct ipt_ecn_info *einfo)
+{
+	return ((skb->nh.iph->tos&IPT_ECN_IP_MASK) == einfo->ip_ect);
+}
+
+static inline int match_tcp(const struct sk_buff *skb,
+			    const struct ipt_ecn_info *einfo,
+			    int *hotdrop)
+{
+	struct tcphdr _tcph, *th;
+
+	/* In practice, TCP match does this, so can't fail.  But let's
+	 * be good citizens.
+	 */
+	th = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
+				sizeof(_tcph), &_tcph);
+	if (th == NULL) {
+		*hotdrop = 0;
+		return 0;
+	}
+
+	if (einfo->operation & IPT_ECN_OP_MATCH_ECE) {
+		if (einfo->invert & IPT_ECN_OP_MATCH_ECE) {
+			if (th->ece == 1)
+				return 0;
+		} else {
+			if (th->ece == 0)
+				return 0;
+		}
+	}
+
+	if (einfo->operation & IPT_ECN_OP_MATCH_CWR) {
+		if (einfo->invert & IPT_ECN_OP_MATCH_CWR) {
+			if (th->cwr == 1)
+				return 0;
+		} else {
+			if (th->cwr == 0)
+				return 0;
+		}
+	}
+
+	return 1;
+}
+
+static int match(const struct sk_buff *skb, const struct net_device *in,
+		 const struct net_device *out, const void *matchinfo,
+		 int offset, int *hotdrop)
+{
+	const struct ipt_ecn_info *info = matchinfo;
+
+	if (info->operation & IPT_ECN_OP_MATCH_IP)
+		if (!match_ip(skb, info))
+			return 0;
+
+	if (info->operation & (IPT_ECN_OP_MATCH_ECE|IPT_ECN_OP_MATCH_CWR)) {
+		if (skb->nh.iph->protocol != IPPROTO_TCP)
+			return 0;
+		if (!match_tcp(skb, info, hotdrop))
+			return 0;
+	}
+
+	return 1;
+}
+
+static int checkentry(const char *tablename, const struct ipt_ip *ip,
+		      void *matchinfo, unsigned int matchsize,
+		      unsigned int hook_mask)
+{
+	const struct ipt_ecn_info *info = matchinfo;
+
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_ecn_info)))
+		return 0;
+
+	if (info->operation & IPT_ECN_OP_MATCH_MASK)
+		return 0;
+
+	if (info->invert & IPT_ECN_OP_MATCH_MASK)
+		return 0;
+
+	if (info->operation & (IPT_ECN_OP_MATCH_ECE|IPT_ECN_OP_MATCH_CWR)
+	    && ip->proto != IPPROTO_TCP) {
+		printk(KERN_WARNING "ipt_ecn: can't match TCP bits in rule for"
+		       " non-tcp packets\n");
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_match ecn_match = {
+	.name		= "ecn",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&ecn_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&ecn_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_esp.c b/net/ipv4/netfilter/ipt_esp.c
new file mode 100644
index 000000000000..e1d0dd31e117
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_esp.c
@@ -0,0 +1,118 @@
+/* Kernel module to match ESP parameters. */
+
+/* (C) 1999-2000 Yon Uriarte <yon@astaro.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+
+#include <linux/netfilter_ipv4/ipt_esp.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yon Uriarte <yon@astaro.de>");
+MODULE_DESCRIPTION("iptables ESP SPI match module");
+
+#ifdef DEBUG_CONNTRACK
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+/* Returns 1 if the spi is matched by the range, 0 otherwise */
+static inline int
+spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
+{
+	int r=0;
+        duprintf("esp spi_match:%c 0x%x <= 0x%x <= 0x%x",invert? '!':' ',
+        	min,spi,max);
+	r=(spi >= min && spi <= max) ^ invert;
+	duprintf(" result %s\n",r? "PASS" : "FAILED");
+	return r;
+}
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	struct ip_esp_hdr _esp, *eh;
+	const struct ipt_esp *espinfo = matchinfo;
+
+	/* Must not be a fragment. */
+	if (offset)
+		return 0;
+
+	eh = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
+				sizeof(_esp), &_esp);
+	if (eh == NULL) {
+		/* We've been asked to examine this packet, and we
+		 * can't.  Hence, no choice but to drop.
+		 */
+		duprintf("Dropping evil ESP tinygram.\n");
+		*hotdrop = 1;
+		return 0;
+	}
+
+	return spi_match(espinfo->spis[0], espinfo->spis[1],
+			 ntohl(eh->spi),
+			 !!(espinfo->invflags & IPT_ESP_INV_SPI));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+checkentry(const char *tablename,
+	   const struct ipt_ip *ip,
+	   void *matchinfo,
+	   unsigned int matchinfosize,
+	   unsigned int hook_mask)
+{
+	const struct ipt_esp *espinfo = matchinfo;
+
+	/* Must specify proto == ESP, and no unknown invflags */
+	if (ip->proto != IPPROTO_ESP || (ip->invflags & IPT_INV_PROTO)) {
+		duprintf("ipt_esp: Protocol %u != %u\n", ip->proto,
+			 IPPROTO_ESP);
+		return 0;
+	}
+	if (matchinfosize != IPT_ALIGN(sizeof(struct ipt_esp))) {
+		duprintf("ipt_esp: matchsize %u != %u\n",
+			 matchinfosize, IPT_ALIGN(sizeof(struct ipt_esp)));
+		return 0;
+	}
+	if (espinfo->invflags & ~IPT_ESP_INV_MASK) {
+		duprintf("ipt_esp: unknown flags %X\n",
+			 espinfo->invflags);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_match esp_match = {
+	.name		= "esp",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&esp_match);
+}
+
+static void __exit cleanup(void)
+{
+	ipt_unregister_match(&esp_match);
+}
+
+module_init(init);
+module_exit(cleanup);
diff --git a/net/ipv4/netfilter/ipt_hashlimit.c b/net/ipv4/netfilter/ipt_hashlimit.c
new file mode 100644
index 000000000000..f1937190cd77
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_hashlimit.c
@@ -0,0 +1,731 @@
+/* iptables match extension to limit the number of packets per second
+ * seperately for each hashbucket (sourceip/sourceport/dstip/dstport)
+ *
+ * (C) 2003-2004 by Harald Welte <laforge@netfilter.org>
+ *
+ * $Id: ipt_hashlimit.c 3244 2004-10-20 16:24:29Z laforge@netfilter.org $
+ *
+ * Development of this code was funded by Astaro AG, http://www.astaro.com/
+ *
+ * based on ipt_limit.c by:
+ * Jérôme de Vivie	<devivie@info.enserb.u-bordeaux.fr>
+ * Hervé Eychenne	<eychenne@info.enserb.u-bordeaux.fr>
+ * Rusty Russell	<rusty@rustcorp.com.au>
+ *
+ * The general idea is to create a hash table for every dstip and have a
+ * seperate limit counter per tuple.  This way you can do something like 'limit
+ * the number of syn packets for each of my internal addresses.
+ *
+ * Ideally this would just be implemented as a general 'hash' match, which would
+ * allow us to attach any iptables target to it's hash buckets.  But this is
+ * not possible in the current iptables architecture.  As always, pkttables for
+ * 2.7.x will help ;)
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/random.h>
+#include <linux/jhash.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/sctp.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/list.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_hashlimit.h>
+#include <linux/netfilter_ipv4/lockhelp.h>
+
+/* FIXME: this is just for IP_NF_ASSERRT */
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("iptables match for limiting per hash-bucket");
+
+/* need to declare this at the top */
+static struct proc_dir_entry *hashlimit_procdir;
+static struct file_operations dl_file_ops;
+
+/* hash table crap */
+
+struct dsthash_dst {
+	u_int32_t src_ip;
+	u_int32_t dst_ip;
+	/* ports have to be consecutive !!! */
+	u_int16_t src_port;
+	u_int16_t dst_port;
+};
+
+struct dsthash_ent {
+	/* static / read-only parts in the beginning */
+	struct hlist_node node;
+	struct dsthash_dst dst;
+
+	/* modified structure members in the end */
+	unsigned long expires;		/* precalculated expiry time */
+	struct {
+		unsigned long prev;	/* last modification */
+		u_int32_t credit;
+		u_int32_t credit_cap, cost;
+	} rateinfo;
+};
+
+struct ipt_hashlimit_htable {
+	struct hlist_node node;		/* global list of all htables */
+	atomic_t use;
+
+	struct hashlimit_cfg cfg;	/* config */
+
+	/* used internally */
+	spinlock_t lock;		/* lock for list_head */
+	u_int32_t rnd;			/* random seed for hash */
+	struct timer_list timer;	/* timer for gc */
+	atomic_t count;			/* number entries in table */
+
+	/* seq_file stuff */
+	struct proc_dir_entry *pde;
+
+	struct hlist_head hash[0];	/* hashtable itself */
+};
+
+static DECLARE_LOCK(hashlimit_lock);	/* protects htables list */
+static DECLARE_MUTEX(hlimit_mutex);	/* additional checkentry protection */
+static HLIST_HEAD(hashlimit_htables);
+static kmem_cache_t *hashlimit_cachep;
+
+static inline int dst_cmp(const struct dsthash_ent *ent, struct dsthash_dst *b)
+{
+	return (ent->dst.dst_ip == b->dst_ip 
+		&& ent->dst.dst_port == b->dst_port
+		&& ent->dst.src_port == b->src_port
+		&& ent->dst.src_ip == b->src_ip);
+}
+
+static inline u_int32_t
+hash_dst(const struct ipt_hashlimit_htable *ht, const struct dsthash_dst *dst)
+{
+	return (jhash_3words(dst->dst_ip, (dst->dst_port<<16 | dst->src_port), 
+			     dst->src_ip, ht->rnd) % ht->cfg.size);
+}
+
+static inline struct dsthash_ent *
+__dsthash_find(const struct ipt_hashlimit_htable *ht, struct dsthash_dst *dst)
+{
+	struct dsthash_ent *ent;
+	struct hlist_node *pos;
+	u_int32_t hash = hash_dst(ht, dst);
+
+	if (!hlist_empty(&ht->hash[hash]))
+		hlist_for_each_entry(ent, pos, &ht->hash[hash], node) {
+			if (dst_cmp(ent, dst)) {
+				return ent;
+			}
+		}
+	
+	return NULL;
+}
+
+/* allocate dsthash_ent, initialize dst, put in htable and lock it */
+static struct dsthash_ent *
+__dsthash_alloc_init(struct ipt_hashlimit_htable *ht, struct dsthash_dst *dst)
+{
+	struct dsthash_ent *ent;
+
+	/* initialize hash with random val at the time we allocate
+	 * the first hashtable entry */
+	if (!ht->rnd)
+		get_random_bytes(&ht->rnd, 4);
+
+	if (ht->cfg.max &&
+	    atomic_read(&ht->count) >= ht->cfg.max) {
+		/* FIXME: do something. question is what.. */
+		if (net_ratelimit())
+			printk(KERN_WARNING 
+				"ipt_hashlimit: max count of %u reached\n", 
+				ht->cfg.max);
+		return NULL;
+	}
+
+	ent = kmem_cache_alloc(hashlimit_cachep, GFP_ATOMIC);
+	if (!ent) {
+		if (net_ratelimit())
+			printk(KERN_ERR 
+				"ipt_hashlimit: can't allocate dsthash_ent\n");
+		return NULL;
+	}
+
+	atomic_inc(&ht->count);
+
+	ent->dst.dst_ip = dst->dst_ip;
+	ent->dst.dst_port = dst->dst_port;
+	ent->dst.src_ip = dst->src_ip;
+	ent->dst.src_port = dst->src_port;
+
+	hlist_add_head(&ent->node, &ht->hash[hash_dst(ht, dst)]);
+
+	return ent;
+}
+
+static inline void 
+__dsthash_free(struct ipt_hashlimit_htable *ht, struct dsthash_ent *ent)
+{
+	hlist_del(&ent->node);
+	kmem_cache_free(hashlimit_cachep, ent);
+	atomic_dec(&ht->count);
+}
+static void htable_gc(unsigned long htlong);
+
+static int htable_create(struct ipt_hashlimit_info *minfo)
+{
+	int i;
+	unsigned int size;
+	struct ipt_hashlimit_htable *hinfo;
+
+	if (minfo->cfg.size)
+		size = minfo->cfg.size;
+	else {
+		size = (((num_physpages << PAGE_SHIFT) / 16384)
+			 / sizeof(struct list_head));
+		if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE))
+			size = 8192;
+		if (size < 16)
+			size = 16;
+	}
+	/* FIXME: don't use vmalloc() here or anywhere else -HW */
+	hinfo = vmalloc(sizeof(struct ipt_hashlimit_htable)
+			+ (sizeof(struct list_head) * size));
+	if (!hinfo) {
+		printk(KERN_ERR "ipt_hashlimit: Unable to create hashtable\n");
+		return -1;
+	}
+	minfo->hinfo = hinfo;
+
+	/* copy match config into hashtable config */
+	memcpy(&hinfo->cfg, &minfo->cfg, sizeof(hinfo->cfg));
+	hinfo->cfg.size = size;
+	if (!hinfo->cfg.max)
+		hinfo->cfg.max = 8 * hinfo->cfg.size;
+	else if (hinfo->cfg.max < hinfo->cfg.size)
+		hinfo->cfg.max = hinfo->cfg.size;
+
+	for (i = 0; i < hinfo->cfg.size; i++)
+		INIT_HLIST_HEAD(&hinfo->hash[i]);
+
+	atomic_set(&hinfo->count, 0);
+	atomic_set(&hinfo->use, 1);
+	hinfo->rnd = 0;
+	spin_lock_init(&hinfo->lock);
+	hinfo->pde = create_proc_entry(minfo->name, 0, hashlimit_procdir);
+	if (!hinfo->pde) {
+		vfree(hinfo);
+		return -1;
+	}
+	hinfo->pde->proc_fops = &dl_file_ops;
+	hinfo->pde->data = hinfo;
+
+	init_timer(&hinfo->timer);
+	hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval);
+	hinfo->timer.data = (unsigned long )hinfo;
+	hinfo->timer.function = htable_gc;
+	add_timer(&hinfo->timer);
+
+	LOCK_BH(&hashlimit_lock);
+	hlist_add_head(&hinfo->node, &hashlimit_htables);
+	UNLOCK_BH(&hashlimit_lock);
+
+	return 0;
+}
+
+static int select_all(struct ipt_hashlimit_htable *ht, struct dsthash_ent *he)
+{
+	return 1;
+}
+
+static int select_gc(struct ipt_hashlimit_htable *ht, struct dsthash_ent *he)
+{
+	return (jiffies >= he->expires);
+}
+
+static void htable_selective_cleanup(struct ipt_hashlimit_htable *ht,
+		 		int (*select)(struct ipt_hashlimit_htable *ht, 
+					      struct dsthash_ent *he))
+{
+	int i;
+
+	IP_NF_ASSERT(ht->cfg.size && ht->cfg.max);
+
+	/* lock hash table and iterate over it */
+	spin_lock_bh(&ht->lock);
+	for (i = 0; i < ht->cfg.size; i++) {
+		struct dsthash_ent *dh;
+		struct hlist_node *pos, *n;
+		hlist_for_each_entry_safe(dh, pos, n, &ht->hash[i], node) {
+			if ((*select)(ht, dh))
+				__dsthash_free(ht, dh);
+		}
+	}
+	spin_unlock_bh(&ht->lock);
+}
+
+/* hash table garbage collector, run by timer */
+static void htable_gc(unsigned long htlong)
+{
+	struct ipt_hashlimit_htable *ht = (struct ipt_hashlimit_htable *)htlong;
+
+	htable_selective_cleanup(ht, select_gc);
+
+	/* re-add the timer accordingly */
+	ht->timer.expires = jiffies + msecs_to_jiffies(ht->cfg.gc_interval);
+	add_timer(&ht->timer);
+}
+
+static void htable_destroy(struct ipt_hashlimit_htable *hinfo)
+{
+	/* remove timer, if it is pending */
+	if (timer_pending(&hinfo->timer))
+		del_timer(&hinfo->timer);
+
+	/* remove proc entry */
+	remove_proc_entry(hinfo->pde->name, hashlimit_procdir);
+
+	htable_selective_cleanup(hinfo, select_all);
+	vfree(hinfo);
+}
+
+static struct ipt_hashlimit_htable *htable_find_get(char *name)
+{
+	struct ipt_hashlimit_htable *hinfo;
+	struct hlist_node *pos;
+
+	LOCK_BH(&hashlimit_lock);
+	hlist_for_each_entry(hinfo, pos, &hashlimit_htables, node) {
+		if (!strcmp(name, hinfo->pde->name)) {
+			atomic_inc(&hinfo->use);
+			UNLOCK_BH(&hashlimit_lock);
+			return hinfo;
+		}
+	}
+	UNLOCK_BH(&hashlimit_lock);
+
+	return NULL;
+}
+
+static void htable_put(struct ipt_hashlimit_htable *hinfo)
+{
+	if (atomic_dec_and_test(&hinfo->use)) {
+		LOCK_BH(&hashlimit_lock);
+		hlist_del(&hinfo->node);
+		UNLOCK_BH(&hashlimit_lock);
+		htable_destroy(hinfo);
+	}
+}
+
+
+/* The algorithm used is the Simple Token Bucket Filter (TBF)
+ * see net/sched/sch_tbf.c in the linux source tree
+ */
+
+/* Rusty: This is my (non-mathematically-inclined) understanding of
+   this algorithm.  The `average rate' in jiffies becomes your initial
+   amount of credit `credit' and the most credit you can ever have
+   `credit_cap'.  The `peak rate' becomes the cost of passing the
+   test, `cost'.
+
+   `prev' tracks the last packet hit: you gain one credit per jiffy.
+   If you get credit balance more than this, the extra credit is
+   discarded.  Every time the match passes, you lose `cost' credits;
+   if you don't have that many, the test fails.
+
+   See Alexey's formal explanation in net/sched/sch_tbf.c.
+
+   To get the maximum range, we multiply by this factor (ie. you get N
+   credits per jiffy).  We want to allow a rate as low as 1 per day
+   (slowest userspace tool allows), which means
+   CREDITS_PER_JIFFY*HZ*60*60*24 < 2^32 ie.
+*/
+#define MAX_CPJ (0xFFFFFFFF / (HZ*60*60*24))
+
+/* Repeated shift and or gives us all 1s, final shift and add 1 gives
+ * us the power of 2 below the theoretical max, so GCC simply does a
+ * shift. */
+#define _POW2_BELOW2(x) ((x)|((x)>>1))
+#define _POW2_BELOW4(x) (_POW2_BELOW2(x)|_POW2_BELOW2((x)>>2))
+#define _POW2_BELOW8(x) (_POW2_BELOW4(x)|_POW2_BELOW4((x)>>4))
+#define _POW2_BELOW16(x) (_POW2_BELOW8(x)|_POW2_BELOW8((x)>>8))
+#define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16))
+#define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1)
+
+#define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ)
+
+/* Precision saver. */
+static inline u_int32_t
+user2credits(u_int32_t user)
+{
+	/* If multiplying would overflow... */
+	if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
+		/* Divide first. */
+		return (user / IPT_HASHLIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
+
+	return (user * HZ * CREDITS_PER_JIFFY) / IPT_HASHLIMIT_SCALE;
+}
+
+static inline void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now)
+{
+	dh->rateinfo.credit += (now - xchg(&dh->rateinfo.prev, now)) 
+					* CREDITS_PER_JIFFY;
+	if (dh->rateinfo.credit > dh->rateinfo.credit_cap)
+		dh->rateinfo.credit = dh->rateinfo.credit_cap;
+}
+
+static inline int get_ports(const struct sk_buff *skb, int offset, 
+			    u16 ports[2])
+{
+	union {
+		struct tcphdr th;
+		struct udphdr uh;
+		sctp_sctphdr_t sctph;
+	} hdr_u, *ptr_u;
+
+	/* Must not be a fragment. */
+	if (offset)
+		return 1;
+
+	/* Must be big enough to read ports (both UDP and TCP have
+	   them at the start). */
+	ptr_u = skb_header_pointer(skb, skb->nh.iph->ihl*4, 8, &hdr_u); 
+	if (!ptr_u)
+		return 1;
+
+	switch (skb->nh.iph->protocol) {
+		case IPPROTO_TCP:
+			ports[0] = ptr_u->th.source;
+			ports[1] = ptr_u->th.dest;
+			break;
+		case IPPROTO_UDP:
+			ports[0] = ptr_u->uh.source;
+			ports[1] = ptr_u->uh.dest;
+			break;
+		case IPPROTO_SCTP:
+			ports[0] = ptr_u->sctph.source;
+			ports[1] = ptr_u->sctph.dest;
+			break;
+		default:
+			/* all other protocols don't supprot per-port hash
+			 * buckets */
+			ports[0] = ports[1] = 0;
+			break;
+	}
+
+	return 0;
+}
+
+
+static int
+hashlimit_match(const struct sk_buff *skb,
+		const struct net_device *in,
+		const struct net_device *out,
+		const void *matchinfo,
+		int offset,
+		int *hotdrop)
+{
+	struct ipt_hashlimit_info *r = 
+		((struct ipt_hashlimit_info *)matchinfo)->u.master;
+	struct ipt_hashlimit_htable *hinfo = r->hinfo;
+	unsigned long now = jiffies;
+	struct dsthash_ent *dh;
+	struct dsthash_dst dst;
+
+	/* build 'dst' according to hinfo->cfg and current packet */
+	memset(&dst, 0, sizeof(dst));
+	if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_DIP)
+		dst.dst_ip = skb->nh.iph->daddr;
+	if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_SIP)
+		dst.src_ip = skb->nh.iph->saddr;
+	if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_DPT
+	    ||hinfo->cfg.mode & IPT_HASHLIMIT_HASH_SPT) {
+		u_int16_t ports[2];
+		if (get_ports(skb, offset, ports)) {
+			/* We've been asked to examine this packet, and we
+		 	  can't.  Hence, no choice but to drop. */
+			*hotdrop = 1;
+			return 0;
+		}
+		if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_SPT)
+			dst.src_port = ports[0];
+		if (hinfo->cfg.mode & IPT_HASHLIMIT_HASH_DPT)
+			dst.dst_port = ports[1];
+	} 
+
+	spin_lock_bh(&hinfo->lock);
+	dh = __dsthash_find(hinfo, &dst);
+	if (!dh) {
+		dh = __dsthash_alloc_init(hinfo, &dst);
+
+		if (!dh) {
+			/* enomem... don't match == DROP */
+			if (net_ratelimit())
+				printk(KERN_ERR "%s: ENOMEM\n", __FUNCTION__);
+			spin_unlock_bh(&hinfo->lock);
+			return 0;
+		}
+
+		dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire);
+
+		dh->rateinfo.prev = jiffies;
+		dh->rateinfo.credit = user2credits(hinfo->cfg.avg * 
+							hinfo->cfg.burst);
+		dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg * 
+							hinfo->cfg.burst);
+		dh->rateinfo.cost = user2credits(hinfo->cfg.avg);
+
+		spin_unlock_bh(&hinfo->lock);
+		return 1;
+	}
+
+	/* update expiration timeout */
+	dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire);
+
+	rateinfo_recalc(dh, now);
+	if (dh->rateinfo.credit >= dh->rateinfo.cost) {
+		/* We're underlimit. */
+		dh->rateinfo.credit -= dh->rateinfo.cost;
+		spin_unlock_bh(&hinfo->lock);
+		return 1;
+	}
+
+       	spin_unlock_bh(&hinfo->lock);
+
+	/* default case: we're overlimit, thus don't match */
+	return 0;
+}
+
+static int
+hashlimit_checkentry(const char *tablename,
+		     const struct ipt_ip *ip,
+		     void *matchinfo,
+		     unsigned int matchsize,
+		     unsigned int hook_mask)
+{
+	struct ipt_hashlimit_info *r = matchinfo;
+
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_hashlimit_info)))
+		return 0;
+
+	/* Check for overflow. */
+	if (r->cfg.burst == 0
+	    || user2credits(r->cfg.avg * r->cfg.burst) < 
+	    				user2credits(r->cfg.avg)) {
+		printk(KERN_ERR "ipt_hashlimit: Overflow, try lower: %u/%u\n",
+		       r->cfg.avg, r->cfg.burst);
+		return 0;
+	}
+
+	if (r->cfg.mode == 0 
+	    || r->cfg.mode > (IPT_HASHLIMIT_HASH_DPT
+		          |IPT_HASHLIMIT_HASH_DIP
+			  |IPT_HASHLIMIT_HASH_SIP
+			  |IPT_HASHLIMIT_HASH_SPT))
+		return 0;
+
+	if (!r->cfg.gc_interval)
+		return 0;
+	
+	if (!r->cfg.expire)
+		return 0;
+
+	/* This is the best we've got: We cannot release and re-grab lock,
+	 * since checkentry() is called before ip_tables.c grabs ipt_mutex.  
+	 * We also cannot grab the hashtable spinlock, since htable_create will 
+	 * call vmalloc, and that can sleep.  And we cannot just re-search
+	 * the list of htable's in htable_create(), since then we would
+	 * create duplicate proc files. -HW */
+	down(&hlimit_mutex);
+	r->hinfo = htable_find_get(r->name);
+	if (!r->hinfo && (htable_create(r) != 0)) {
+		up(&hlimit_mutex);
+		return 0;
+	}
+	up(&hlimit_mutex);
+
+	/* Ugly hack: For SMP, we only want to use one set */
+	r->u.master = r;
+
+	return 1;
+}
+
+static void
+hashlimit_destroy(void *matchinfo, unsigned int matchsize)
+{
+	struct ipt_hashlimit_info *r = (struct ipt_hashlimit_info *) matchinfo;
+
+	htable_put(r->hinfo);
+}
+
+static struct ipt_match ipt_hashlimit = { 
+	.name = "hashlimit", 
+	.match = hashlimit_match, 
+	.checkentry = hashlimit_checkentry, 
+	.destroy = hashlimit_destroy,
+	.me = THIS_MODULE 
+};
+
+/* PROC stuff */
+
+static void *dl_seq_start(struct seq_file *s, loff_t *pos)
+{
+	struct proc_dir_entry *pde = s->private;
+	struct ipt_hashlimit_htable *htable = pde->data;
+	unsigned int *bucket;
+
+	spin_lock_bh(&htable->lock);
+	if (*pos >= htable->cfg.size)
+		return NULL;
+
+	bucket = kmalloc(sizeof(unsigned int), GFP_ATOMIC);
+	if (!bucket)
+		return ERR_PTR(-ENOMEM);
+
+	*bucket = *pos;
+	return bucket;
+}
+
+static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	struct proc_dir_entry *pde = s->private;
+	struct ipt_hashlimit_htable *htable = pde->data;
+	unsigned int *bucket = (unsigned int *)v;
+
+	*pos = ++(*bucket);
+	if (*pos >= htable->cfg.size) {
+		kfree(v);
+		return NULL;
+	}
+	return bucket;
+}
+
+static void dl_seq_stop(struct seq_file *s, void *v)
+{
+	struct proc_dir_entry *pde = s->private;
+	struct ipt_hashlimit_htable *htable = pde->data;
+	unsigned int *bucket = (unsigned int *)v;
+
+	kfree(bucket);
+
+	spin_unlock_bh(&htable->lock);
+}
+
+static inline int dl_seq_real_show(struct dsthash_ent *ent, struct seq_file *s)
+{
+	/* recalculate to show accurate numbers */
+	rateinfo_recalc(ent, jiffies);
+
+	return seq_printf(s, "%ld %u.%u.%u.%u:%u->%u.%u.%u.%u:%u %u %u %u\n",
+			(long)(ent->expires - jiffies)/HZ,
+			NIPQUAD(ent->dst.src_ip), ntohs(ent->dst.src_port),
+			NIPQUAD(ent->dst.dst_ip), ntohs(ent->dst.dst_port),
+			ent->rateinfo.credit, ent->rateinfo.credit_cap,
+			ent->rateinfo.cost);
+}
+
+static int dl_seq_show(struct seq_file *s, void *v)
+{
+	struct proc_dir_entry *pde = s->private;
+	struct ipt_hashlimit_htable *htable = pde->data;
+	unsigned int *bucket = (unsigned int *)v;
+	struct dsthash_ent *ent;
+	struct hlist_node *pos;
+
+	if (!hlist_empty(&htable->hash[*bucket]))
+		hlist_for_each_entry(ent, pos, &htable->hash[*bucket], node) {
+			if (dl_seq_real_show(ent, s)) {
+				/* buffer was filled and unable to print that tuple */
+				return 1;
+			}
+		}
+	
+	return 0;
+}
+
+static struct seq_operations dl_seq_ops = {
+	.start = dl_seq_start,
+	.next  = dl_seq_next,
+	.stop  = dl_seq_stop,
+	.show  = dl_seq_show
+};
+
+static int dl_proc_open(struct inode *inode, struct file *file)
+{
+	int ret = seq_open(file, &dl_seq_ops);
+
+	if (!ret) {
+		struct seq_file *sf = file->private_data;
+		sf->private = PDE(inode);
+	}
+	return ret;
+}
+
+static struct file_operations dl_file_ops = {
+	.owner   = THIS_MODULE,
+	.open    = dl_proc_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release
+};
+
+static int init_or_fini(int fini)
+{
+	int ret = 0;
+
+	if (fini)
+		goto cleanup;
+
+	if (ipt_register_match(&ipt_hashlimit)) {
+		ret = -EINVAL;
+		goto cleanup_nothing;
+	}
+
+	hashlimit_cachep = kmem_cache_create("ipt_hashlimit",
+					    sizeof(struct dsthash_ent), 0,
+					    0, NULL, NULL);
+	if (!hashlimit_cachep) {
+		printk(KERN_ERR "Unable to create ipt_hashlimit slab cache\n");
+		ret = -ENOMEM;
+		goto cleanup_unreg_match;
+	}
+
+	hashlimit_procdir = proc_mkdir("ipt_hashlimit", proc_net);
+	if (!hashlimit_procdir) {
+		printk(KERN_ERR "Unable to create proc dir entry\n");
+		ret = -ENOMEM;
+		goto cleanup_free_slab;
+	}
+
+	return ret;
+
+cleanup:
+	remove_proc_entry("ipt_hashlimit", proc_net);
+cleanup_free_slab:
+	kmem_cache_destroy(hashlimit_cachep);
+cleanup_unreg_match:
+	ipt_unregister_match(&ipt_hashlimit);
+cleanup_nothing:
+	return ret;
+	
+}
+
+static int __init init(void)
+{
+	return init_or_fini(0);
+}
+
+static void __exit fini(void)
+{
+	init_or_fini(1);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_helper.c b/net/ipv4/netfilter/ipt_helper.c
new file mode 100644
index 000000000000..33fdf364d3d3
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_helper.c
@@ -0,0 +1,113 @@
+/* iptables module to match on related connections */
+/*
+ * (C) 2001 Martin Josefsson <gandalf@wlug.westbo.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *   19 Mar 2002 Harald Welte <laforge@gnumonks.org>:
+ *   		 - Port to newnat infrastructure
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_helper.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Martin Josefsson <gandalf@netfilter.org>");
+MODULE_DESCRIPTION("iptables helper match module");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_helper_info *info = matchinfo;
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	int ret = info->invert;
+	
+	ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
+	if (!ct) {
+		DEBUGP("ipt_helper: Eek! invalid conntrack?\n");
+		return ret;
+	}
+
+	if (!ct->master) {
+		DEBUGP("ipt_helper: conntrack %p has no master\n", ct);
+		return ret;
+	}
+
+	READ_LOCK(&ip_conntrack_lock);
+	if (!ct->master->helper) {
+		DEBUGP("ipt_helper: master ct %p has no helper\n", 
+			exp->expectant);
+		goto out_unlock;
+	}
+
+	DEBUGP("master's name = %s , info->name = %s\n", 
+		ct->master->helper->name, info->name);
+
+	if (info->name[0] == '\0')
+		ret ^= 1;
+	else
+		ret ^= !strncmp(ct->master->helper->name, info->name, 
+		                strlen(ct->master->helper->name));
+out_unlock:
+	READ_UNLOCK(&ip_conntrack_lock);
+	return ret;
+}
+
+static int check(const char *tablename,
+		 const struct ipt_ip *ip,
+		 void *matchinfo,
+		 unsigned int matchsize,
+		 unsigned int hook_mask)
+{
+	struct ipt_helper_info *info = matchinfo;
+
+	info->name[29] = '\0';
+
+	/* verify size */
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_helper_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match helper_match = {
+	.name		= "helper",
+	.match		= &match,
+	.checkentry	= &check,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	need_ip_conntrack();
+	return ipt_register_match(&helper_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&helper_match);
+}
+
+module_init(init);
+module_exit(fini);
+
diff --git a/net/ipv4/netfilter/ipt_iprange.c b/net/ipv4/netfilter/ipt_iprange.c
new file mode 100644
index 000000000000..b835b7b2e560
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_iprange.c
@@ -0,0 +1,99 @@
+/*
+ * iptables module to match IP address ranges
+ *
+ * (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_iprange.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
+MODULE_DESCRIPTION("iptables arbitrary IP range match module");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset, int *hotdrop)
+{
+	const struct ipt_iprange_info *info = matchinfo;
+	const struct iphdr *iph = skb->nh.iph;
+
+	if (info->flags & IPRANGE_SRC) {
+		if (((ntohl(iph->saddr) < ntohl(info->src.min_ip))
+			  || (ntohl(iph->saddr) > ntohl(info->src.max_ip)))
+			 ^ !!(info->flags & IPRANGE_SRC_INV)) {
+			DEBUGP("src IP %u.%u.%u.%u NOT in range %s"
+			       "%u.%u.%u.%u-%u.%u.%u.%u\n",
+				NIPQUAD(iph->saddr),
+			        info->flags & IPRANGE_SRC_INV ? "(INV) " : "",
+				NIPQUAD(info->src.min_ip),
+				NIPQUAD(info->src.max_ip));
+			return 0;
+		}
+	}
+	if (info->flags & IPRANGE_DST) {
+		if (((ntohl(iph->daddr) < ntohl(info->dst.min_ip))
+			  || (ntohl(iph->daddr) > ntohl(info->dst.max_ip)))
+			 ^ !!(info->flags & IPRANGE_DST_INV)) {
+			DEBUGP("dst IP %u.%u.%u.%u NOT in range %s"
+			       "%u.%u.%u.%u-%u.%u.%u.%u\n",
+				NIPQUAD(iph->daddr),
+			        info->flags & IPRANGE_DST_INV ? "(INV) " : "",
+				NIPQUAD(info->dst.min_ip),
+				NIPQUAD(info->dst.max_ip));
+			return 0;
+		}
+	}
+	return 1;
+}
+
+static int check(const char *tablename,
+		 const struct ipt_ip *ip,
+		 void *matchinfo,
+		 unsigned int matchsize,
+		 unsigned int hook_mask)
+{
+	/* verify size */
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_iprange_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match iprange_match = 
+{ 
+	.list = { NULL, NULL }, 
+	.name = "iprange", 
+	.match = &match, 
+	.checkentry = &check, 
+	.destroy = NULL, 
+	.me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&iprange_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&iprange_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_length.c b/net/ipv4/netfilter/ipt_length.c
new file mode 100644
index 000000000000..4eabcfbda9d1
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_length.c
@@ -0,0 +1,64 @@
+/* Kernel module to match packet length. */
+/* (C) 1999-2001 James Morris <jmorros@intercode.com.au>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ipt_length.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
+MODULE_DESCRIPTION("IP tables packet length matching module");
+MODULE_LICENSE("GPL");
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_length_info *info = matchinfo;
+	u_int16_t pktlen = ntohs(skb->nh.iph->tot_len);
+	
+	return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+           const struct ipt_ip *ip,
+           void *matchinfo,
+           unsigned int matchsize,
+           unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_length_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match length_match = {
+	.name		= "length",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&length_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&length_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_limit.c b/net/ipv4/netfilter/ipt_limit.c
new file mode 100644
index 000000000000..0c24dcc703a5
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_limit.c
@@ -0,0 +1,157 @@
+/* Kernel module to control the rate
+ *
+ * 2 September 1999: Changed from the target RATE to the match
+ *                   `limit', removed logging.  Did I mention that
+ *                   Alexey is a fucking genius?
+ *                   Rusty Russell (rusty@rustcorp.com.au).  */
+
+/* (C) 1999 Jérôme de Vivie <devivie@info.enserb.u-bordeaux.fr>
+ * (C) 1999 Hervé Eychenne <eychenne@info.enserb.u-bordeaux.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_limit.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Herve Eychenne <rv@wallfire.org>");
+MODULE_DESCRIPTION("iptables rate limit match");
+
+/* The algorithm used is the Simple Token Bucket Filter (TBF)
+ * see net/sched/sch_tbf.c in the linux source tree
+ */
+
+static DEFINE_SPINLOCK(limit_lock);
+
+/* Rusty: This is my (non-mathematically-inclined) understanding of
+   this algorithm.  The `average rate' in jiffies becomes your initial
+   amount of credit `credit' and the most credit you can ever have
+   `credit_cap'.  The `peak rate' becomes the cost of passing the
+   test, `cost'.
+
+   `prev' tracks the last packet hit: you gain one credit per jiffy.
+   If you get credit balance more than this, the extra credit is
+   discarded.  Every time the match passes, you lose `cost' credits;
+   if you don't have that many, the test fails.
+
+   See Alexey's formal explanation in net/sched/sch_tbf.c.
+
+   To get the maxmum range, we multiply by this factor (ie. you get N
+   credits per jiffy).  We want to allow a rate as low as 1 per day
+   (slowest userspace tool allows), which means
+   CREDITS_PER_JIFFY*HZ*60*60*24 < 2^32. ie. */
+#define MAX_CPJ (0xFFFFFFFF / (HZ*60*60*24))
+
+/* Repeated shift and or gives us all 1s, final shift and add 1 gives
+ * us the power of 2 below the theoretical max, so GCC simply does a
+ * shift. */
+#define _POW2_BELOW2(x) ((x)|((x)>>1))
+#define _POW2_BELOW4(x) (_POW2_BELOW2(x)|_POW2_BELOW2((x)>>2))
+#define _POW2_BELOW8(x) (_POW2_BELOW4(x)|_POW2_BELOW4((x)>>4))
+#define _POW2_BELOW16(x) (_POW2_BELOW8(x)|_POW2_BELOW8((x)>>8))
+#define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16))
+#define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1)
+
+#define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ)
+
+static int
+ipt_limit_match(const struct sk_buff *skb,
+		const struct net_device *in,
+		const struct net_device *out,
+		const void *matchinfo,
+		int offset,
+		int *hotdrop)
+{
+	struct ipt_rateinfo *r = ((struct ipt_rateinfo *)matchinfo)->master;
+	unsigned long now = jiffies;
+
+	spin_lock_bh(&limit_lock);
+	r->credit += (now - xchg(&r->prev, now)) * CREDITS_PER_JIFFY;
+	if (r->credit > r->credit_cap)
+		r->credit = r->credit_cap;
+
+	if (r->credit >= r->cost) {
+		/* We're not limited. */
+		r->credit -= r->cost;
+		spin_unlock_bh(&limit_lock);
+		return 1;
+	}
+
+       	spin_unlock_bh(&limit_lock);
+	return 0;
+}
+
+/* Precision saver. */
+static u_int32_t
+user2credits(u_int32_t user)
+{
+	/* If multiplying would overflow... */
+	if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
+		/* Divide first. */
+		return (user / IPT_LIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
+
+	return (user * HZ * CREDITS_PER_JIFFY) / IPT_LIMIT_SCALE;
+}
+
+static int
+ipt_limit_checkentry(const char *tablename,
+		     const struct ipt_ip *ip,
+		     void *matchinfo,
+		     unsigned int matchsize,
+		     unsigned int hook_mask)
+{
+	struct ipt_rateinfo *r = matchinfo;
+
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_rateinfo)))
+		return 0;
+
+	/* Check for overflow. */
+	if (r->burst == 0
+	    || user2credits(r->avg * r->burst) < user2credits(r->avg)) {
+		printk("Overflow in ipt_limit, try lower: %u/%u\n",
+		       r->avg, r->burst);
+		return 0;
+	}
+
+	/* User avg in seconds * IPT_LIMIT_SCALE: convert to jiffies *
+	   128. */
+	r->prev = jiffies;
+	r->credit = user2credits(r->avg * r->burst);	 /* Credits full. */
+	r->credit_cap = user2credits(r->avg * r->burst); /* Credits full. */
+	r->cost = user2credits(r->avg);
+
+	/* For SMP, we only want to use one set of counters. */
+	r->master = r;
+
+	return 1;
+}
+
+static struct ipt_match ipt_limit_reg = {
+	.name		= "limit",
+	.match		= ipt_limit_match,
+	.checkentry	= ipt_limit_checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	if (ipt_register_match(&ipt_limit_reg))
+		return -EINVAL;
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&ipt_limit_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_mac.c b/net/ipv4/netfilter/ipt_mac.c
new file mode 100644
index 000000000000..11a459e33f25
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_mac.c
@@ -0,0 +1,79 @@
+/* Kernel module to match MAC address parameters. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/if_ether.h>
+
+#include <linux/netfilter_ipv4/ipt_mac.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables mac matching module");
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+    const struct ipt_mac_info *info = matchinfo;
+
+    /* Is mac pointer valid? */
+    return (skb->mac.raw >= skb->head
+	    && (skb->mac.raw + ETH_HLEN) <= skb->data
+	    /* If so, compare... */
+	    && ((memcmp(eth_hdr(skb)->h_source, info->srcaddr, ETH_ALEN)
+		== 0) ^ info->invert));
+}
+
+static int
+ipt_mac_checkentry(const char *tablename,
+		   const struct ipt_ip *ip,
+		   void *matchinfo,
+		   unsigned int matchsize,
+		   unsigned int hook_mask)
+{
+	/* FORWARD isn't always valid, but it's nice to be able to do --RR */
+	if (hook_mask
+	    & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN)
+		| (1 << NF_IP_FORWARD))) {
+		printk("ipt_mac: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n");
+		return 0;
+	}
+
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_mac_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match mac_match = {
+	.name		= "mac",
+	.match		= &match,
+	.checkentry	= &ipt_mac_checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&mac_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&mac_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_mark.c b/net/ipv4/netfilter/ipt_mark.c
new file mode 100644
index 000000000000..8955728127b9
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_mark.c
@@ -0,0 +1,64 @@
+/* Kernel module to match NFMARK values. */
+
+/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ipt_mark.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("iptables mark matching module");
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_mark_info *info = matchinfo;
+
+	return ((skb->nfmark & info->mask) == info->mark) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+           const struct ipt_ip *ip,
+           void *matchinfo,
+           unsigned int matchsize,
+           unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_mark_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match mark_match = {
+	.name		= "mark",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&mark_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&mark_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_multiport.c b/net/ipv4/netfilter/ipt_multiport.c
new file mode 100644
index 000000000000..99e8188162e2
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_multiport.c
@@ -0,0 +1,212 @@
+/* Kernel module to match one of a list of TCP/UDP ports: ports are in
+   the same place so we can treat them as equal. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/udp.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ipt_multiport.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables multiple port match module");
+
+#if 0
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+/* Returns 1 if the port is matched by the test, 0 otherwise. */
+static inline int
+ports_match(const u_int16_t *portlist, enum ipt_multiport_flags flags,
+	    u_int8_t count, u_int16_t src, u_int16_t dst)
+{
+	unsigned int i;
+	for (i=0; i<count; i++) {
+		if (flags != IPT_MULTIPORT_DESTINATION
+		    && portlist[i] == src)
+			return 1;
+
+		if (flags != IPT_MULTIPORT_SOURCE
+		    && portlist[i] == dst)
+			return 1;
+	}
+
+	return 0;
+}
+
+/* Returns 1 if the port is matched by the test, 0 otherwise. */
+static inline int
+ports_match_v1(const struct ipt_multiport_v1 *minfo,
+	       u_int16_t src, u_int16_t dst)
+{
+	unsigned int i;
+	u_int16_t s, e;
+
+	for (i=0; i < minfo->count; i++) {
+		s = minfo->ports[i];
+
+		if (minfo->pflags[i]) {
+			/* range port matching */
+			e = minfo->ports[++i];
+			duprintf("src or dst matches with %d-%d?\n", s, e);
+
+			if (minfo->flags == IPT_MULTIPORT_SOURCE
+			    && src >= s && src <= e)
+				return 1 ^ minfo->invert;
+			if (minfo->flags == IPT_MULTIPORT_DESTINATION
+			    && dst >= s && dst <= e)
+				return 1 ^ minfo->invert;
+			if (minfo->flags == IPT_MULTIPORT_EITHER
+			    && ((dst >= s && dst <= e)
+				|| (src >= s && src <= e)))
+				return 1 ^ minfo->invert;
+		} else {
+			/* exact port matching */
+			duprintf("src or dst matches with %d?\n", s);
+
+			if (minfo->flags == IPT_MULTIPORT_SOURCE
+			    && src == s)
+				return 1 ^ minfo->invert;
+			if (minfo->flags == IPT_MULTIPORT_DESTINATION
+			    && dst == s)
+				return 1 ^ minfo->invert;
+			if (minfo->flags == IPT_MULTIPORT_EITHER
+			    && (src == s || dst == s))
+				return 1 ^ minfo->invert;
+		}
+	}
+ 
+ 	return minfo->invert;
+}
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	u16 _ports[2], *pptr;
+	const struct ipt_multiport *multiinfo = matchinfo;
+
+	if (offset)
+		return 0;
+
+	pptr = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
+				  sizeof(_ports), _ports);
+	if (pptr == NULL) {
+		/* We've been asked to examine this packet, and we
+		 * can't.  Hence, no choice but to drop.
+		 */
+		duprintf("ipt_multiport:"
+			 " Dropping evil offset=0 tinygram.\n");
+		*hotdrop = 1;
+		return 0;
+	}
+
+	return ports_match(multiinfo->ports,
+			   multiinfo->flags, multiinfo->count,
+			   ntohs(pptr[0]), ntohs(pptr[1]));
+}
+
+static int
+match_v1(const struct sk_buff *skb,
+	 const struct net_device *in,
+	 const struct net_device *out,
+	 const void *matchinfo,
+	 int offset,
+	 int *hotdrop)
+{
+	u16 _ports[2], *pptr;
+	const struct ipt_multiport_v1 *multiinfo = matchinfo;
+
+	if (offset)
+		return 0;
+
+	pptr = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
+				  sizeof(_ports), _ports);
+	if (pptr == NULL) {
+		/* We've been asked to examine this packet, and we
+		 * can't.  Hence, no choice but to drop.
+		 */
+		duprintf("ipt_multiport:"
+			 " Dropping evil offset=0 tinygram.\n");
+		*hotdrop = 1;
+		return 0;
+	}
+
+	return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1]));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+checkentry(const char *tablename,
+	   const struct ipt_ip *ip,
+	   void *matchinfo,
+	   unsigned int matchsize,
+	   unsigned int hook_mask)
+{
+	return (matchsize == IPT_ALIGN(sizeof(struct ipt_multiport)));
+}
+
+static int
+checkentry_v1(const char *tablename,
+	      const struct ipt_ip *ip,
+	      void *matchinfo,
+	      unsigned int matchsize,
+	      unsigned int hook_mask)
+{
+	return (matchsize == IPT_ALIGN(sizeof(struct ipt_multiport_v1)));
+}
+
+static struct ipt_match multiport_match = {
+	.name		= "multiport",
+	.revision	= 0,
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static struct ipt_match multiport_match_v1 = {
+	.name		= "multiport",
+	.revision	= 1,
+	.match		= &match_v1,
+	.checkentry	= &checkentry_v1,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	int err;
+
+	err = ipt_register_match(&multiport_match);
+	if (!err) {
+		err = ipt_register_match(&multiport_match_v1);
+		if (err)
+			ipt_unregister_match(&multiport_match);
+	}
+
+	return err;
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&multiport_match);
+	ipt_unregister_match(&multiport_match_v1);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_owner.c b/net/ipv4/netfilter/ipt_owner.c
new file mode 100644
index 000000000000..3b9065e06381
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_owner.c
@@ -0,0 +1,217 @@
+/* Kernel module to match various things tied to sockets associated with
+   locally generated outgoing packets. */
+
+/* (C) 2000 Marc Boucher <marc@mbsi.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/file.h>
+#include <net/sock.h>
+
+#include <linux/netfilter_ipv4/ipt_owner.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("iptables owner match");
+
+static int
+match_comm(const struct sk_buff *skb, const char *comm)
+{
+	struct task_struct *g, *p;
+	struct files_struct *files;
+	int i;
+
+	read_lock(&tasklist_lock);
+	do_each_thread(g, p) {
+		if(strncmp(p->comm, comm, sizeof(p->comm)))
+			continue;
+
+		task_lock(p);
+		files = p->files;
+		if(files) {
+			spin_lock(&files->file_lock);
+			for (i=0; i < files->max_fds; i++) {
+				if (fcheck_files(files, i) ==
+				    skb->sk->sk_socket->file) {
+					spin_unlock(&files->file_lock);
+					task_unlock(p);
+					read_unlock(&tasklist_lock);
+					return 1;
+				}
+			}
+			spin_unlock(&files->file_lock);
+		}
+		task_unlock(p);
+	} while_each_thread(g, p);
+	read_unlock(&tasklist_lock);
+	return 0;
+}
+
+static int
+match_pid(const struct sk_buff *skb, pid_t pid)
+{
+	struct task_struct *p;
+	struct files_struct *files;
+	int i;
+
+	read_lock(&tasklist_lock);
+	p = find_task_by_pid(pid);
+	if (!p)
+		goto out;
+	task_lock(p);
+	files = p->files;
+	if(files) {
+		spin_lock(&files->file_lock);
+		for (i=0; i < files->max_fds; i++) {
+			if (fcheck_files(files, i) ==
+			    skb->sk->sk_socket->file) {
+				spin_unlock(&files->file_lock);
+				task_unlock(p);
+				read_unlock(&tasklist_lock);
+				return 1;
+			}
+		}
+		spin_unlock(&files->file_lock);
+	}
+	task_unlock(p);
+out:
+	read_unlock(&tasklist_lock);
+	return 0;
+}
+
+static int
+match_sid(const struct sk_buff *skb, pid_t sid)
+{
+	struct task_struct *g, *p;
+	struct file *file = skb->sk->sk_socket->file;
+	int i, found=0;
+
+	read_lock(&tasklist_lock);
+	do_each_thread(g, p) {
+		struct files_struct *files;
+		if (p->signal->session != sid)
+			continue;
+
+		task_lock(p);
+		files = p->files;
+		if (files) {
+			spin_lock(&files->file_lock);
+			for (i=0; i < files->max_fds; i++) {
+				if (fcheck_files(files, i) == file) {
+					found = 1;
+					break;
+				}
+			}
+			spin_unlock(&files->file_lock);
+		}
+		task_unlock(p);
+		if (found)
+			goto out;
+	} while_each_thread(g, p);
+out:
+	read_unlock(&tasklist_lock);
+
+	return found;
+}
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_owner_info *info = matchinfo;
+
+	if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file)
+		return 0;
+
+	if(info->match & IPT_OWNER_UID) {
+		if ((skb->sk->sk_socket->file->f_uid != info->uid) ^
+		    !!(info->invert & IPT_OWNER_UID))
+			return 0;
+	}
+
+	if(info->match & IPT_OWNER_GID) {
+		if ((skb->sk->sk_socket->file->f_gid != info->gid) ^
+		    !!(info->invert & IPT_OWNER_GID))
+			return 0;
+	}
+
+	if(info->match & IPT_OWNER_PID) {
+		if (!match_pid(skb, info->pid) ^
+		    !!(info->invert & IPT_OWNER_PID))
+			return 0;
+	}
+
+	if(info->match & IPT_OWNER_SID) {
+		if (!match_sid(skb, info->sid) ^
+		    !!(info->invert & IPT_OWNER_SID))
+			return 0;
+	}
+
+	if(info->match & IPT_OWNER_COMM) {
+		if (!match_comm(skb, info->comm) ^
+		    !!(info->invert & IPT_OWNER_COMM))
+			return 0;
+	}
+
+	return 1;
+}
+
+static int
+checkentry(const char *tablename,
+           const struct ipt_ip *ip,
+           void *matchinfo,
+           unsigned int matchsize,
+           unsigned int hook_mask)
+{
+        if (hook_mask
+            & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) {
+                printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
+                return 0;
+        }
+
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_owner_info))) {
+		printk("Matchsize %u != %Zu\n", matchsize,
+		       IPT_ALIGN(sizeof(struct ipt_owner_info)));
+		return 0;
+	}
+#ifdef CONFIG_SMP
+	/* files->file_lock can not be used in a BH */
+	if (((struct ipt_owner_info *)matchinfo)->match
+	    & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) {
+		printk("ipt_owner: pid, sid and command matching is broken "
+		       "on SMP.\n");
+		return 0;
+	}
+#endif
+	return 1;
+}
+
+static struct ipt_match owner_match = {
+	.name		= "owner",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&owner_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&owner_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_physdev.c b/net/ipv4/netfilter/ipt_physdev.c
new file mode 100644
index 000000000000..1a53924041fc
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_physdev.c
@@ -0,0 +1,134 @@
+/* Kernel module to match the bridge port in and
+ * out device for IP packets coming into contact with a bridge. */
+
+/* (C) 2001-2003 Bart De Schuymer <bdschuym@pandora.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4/ipt_physdev.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_bridge.h>
+#define MATCH   1
+#define NOMATCH 0
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
+MODULE_DESCRIPTION("iptables bridge physical device match module");
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	int i;
+	static const char nulldevname[IFNAMSIZ];
+	const struct ipt_physdev_info *info = matchinfo;
+	unsigned int ret;
+	const char *indev, *outdev;
+	struct nf_bridge_info *nf_bridge;
+
+	/* Not a bridged IP packet or no info available yet:
+	 * LOCAL_OUT/mangle and LOCAL_OUT/nat don't know if
+	 * the destination device will be a bridge. */
+	if (!(nf_bridge = skb->nf_bridge)) {
+		/* Return MATCH if the invert flags of the used options are on */
+		if ((info->bitmask & IPT_PHYSDEV_OP_BRIDGED) &&
+		    !(info->invert & IPT_PHYSDEV_OP_BRIDGED))
+			return NOMATCH;
+		if ((info->bitmask & IPT_PHYSDEV_OP_ISIN) &&
+		    !(info->invert & IPT_PHYSDEV_OP_ISIN))
+			return NOMATCH;
+		if ((info->bitmask & IPT_PHYSDEV_OP_ISOUT) &&
+		    !(info->invert & IPT_PHYSDEV_OP_ISOUT))
+			return NOMATCH;
+		if ((info->bitmask & IPT_PHYSDEV_OP_IN) &&
+		    !(info->invert & IPT_PHYSDEV_OP_IN))
+			return NOMATCH;
+		if ((info->bitmask & IPT_PHYSDEV_OP_OUT) &&
+		    !(info->invert & IPT_PHYSDEV_OP_OUT))
+			return NOMATCH;
+		return MATCH;
+	}
+
+	/* This only makes sense in the FORWARD and POSTROUTING chains */
+	if ((info->bitmask & IPT_PHYSDEV_OP_BRIDGED) &&
+	    (!!(nf_bridge->mask & BRNF_BRIDGED) ^
+	    !(info->invert & IPT_PHYSDEV_OP_BRIDGED)))
+		return NOMATCH;
+
+	if ((info->bitmask & IPT_PHYSDEV_OP_ISIN &&
+	    (!nf_bridge->physindev ^ !!(info->invert & IPT_PHYSDEV_OP_ISIN))) ||
+	    (info->bitmask & IPT_PHYSDEV_OP_ISOUT &&
+	    (!nf_bridge->physoutdev ^ !!(info->invert & IPT_PHYSDEV_OP_ISOUT))))
+		return NOMATCH;
+
+	if (!(info->bitmask & IPT_PHYSDEV_OP_IN))
+		goto match_outdev;
+	indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname;
+	for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned int); i++) {
+		ret |= (((const unsigned int *)indev)[i]
+			^ ((const unsigned int *)info->physindev)[i])
+			& ((const unsigned int *)info->in_mask)[i];
+	}
+
+	if ((ret == 0) ^ !(info->invert & IPT_PHYSDEV_OP_IN))
+		return NOMATCH;
+
+match_outdev:
+	if (!(info->bitmask & IPT_PHYSDEV_OP_OUT))
+		return MATCH;
+	outdev = nf_bridge->physoutdev ?
+		 nf_bridge->physoutdev->name : nulldevname;
+	for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned int); i++) {
+		ret |= (((const unsigned int *)outdev)[i]
+			^ ((const unsigned int *)info->physoutdev)[i])
+			& ((const unsigned int *)info->out_mask)[i];
+	}
+
+	return (ret != 0) ^ !(info->invert & IPT_PHYSDEV_OP_OUT);
+}
+
+static int
+checkentry(const char *tablename,
+		       const struct ipt_ip *ip,
+		       void *matchinfo,
+		       unsigned int matchsize,
+		       unsigned int hook_mask)
+{
+	const struct ipt_physdev_info *info = matchinfo;
+
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_physdev_info)))
+		return 0;
+	if (!(info->bitmask & IPT_PHYSDEV_OP_MASK) ||
+	    info->bitmask & ~IPT_PHYSDEV_OP_MASK)
+		return 0;
+	return 1;
+}
+
+static struct ipt_match physdev_match = {
+	.name		= "physdev",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&physdev_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&physdev_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_pkttype.c b/net/ipv4/netfilter/ipt_pkttype.c
new file mode 100644
index 000000000000..8ddb1dc5e5ae
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_pkttype.c
@@ -0,0 +1,70 @@
+/* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/if_ether.h>
+#include <linux/if_packet.h>
+
+#include <linux/netfilter_ipv4/ipt_pkttype.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
+MODULE_DESCRIPTION("IP tables match to match on linklayer packet type");
+
+static int match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+    const struct ipt_pkttype_info *info = matchinfo;
+
+    return (skb->pkt_type == info->pkttype) ^ info->invert;
+}
+
+static int checkentry(const char *tablename,
+		   const struct ipt_ip *ip,
+		   void *matchinfo,
+		   unsigned int matchsize,
+		   unsigned int hook_mask)
+{
+/*
+	if (hook_mask
+	    & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN)
+		| (1 << NF_IP_FORWARD))) {
+		printk("ipt_pkttype: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n");
+		return 0;
+	}
+*/
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_pkttype_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match pkttype_match = {
+	.name		= "pkttype",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&pkttype_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&pkttype_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_realm.c b/net/ipv4/netfilter/ipt_realm.c
new file mode 100644
index 000000000000..54a6897ebaa6
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_realm.c
@@ -0,0 +1,76 @@
+/* IP tables module for matching the routing realm
+ *
+ * $Id: ipt_realm.c,v 1.3 2004/03/05 13:25:40 laforge Exp $
+ *
+ * (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <net/route.h>
+
+#include <linux/netfilter_ipv4/ipt_realm.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("iptables realm match");
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_realm_info *info = matchinfo;
+	struct dst_entry *dst = skb->dst;
+    
+	return (info->id == (dst->tclassid & info->mask)) ^ info->invert;
+}
+
+static int check(const char *tablename,
+                 const struct ipt_ip *ip,
+                 void *matchinfo,
+                 unsigned int matchsize,
+                 unsigned int hook_mask)
+{
+	if (hook_mask
+	    & ~((1 << NF_IP_POST_ROUTING) | (1 << NF_IP_FORWARD) |
+	        (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_LOCAL_IN))) {
+		printk("ipt_realm: only valid for POST_ROUTING, LOCAL_OUT, "
+		       "LOCAL_IN or FORWARD.\n");
+		return 0;
+	}
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_realm_info))) {
+		printk("ipt_realm: invalid matchsize.\n");
+		return 0;
+	}
+	return 1;
+}
+
+static struct ipt_match realm_match = {
+	.name		= "realm",
+	.match		= match, 
+	.checkentry	= check,
+	.me		= THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&realm_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&realm_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_recent.c b/net/ipv4/netfilter/ipt_recent.c
new file mode 100644
index 000000000000..25ab9fabdcba
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_recent.c
@@ -0,0 +1,1002 @@
+/* Kernel module to check if the source address has been seen recently. */
+/* Copyright 2002-2003, Stephen Frost, 2.5.x port by laforge@netfilter.org */
+/* Author: Stephen Frost <sfrost@snowman.net> */
+/* Project Page: http://snowman.net/projects/ipt_recent/ */
+/* This software is distributed under the terms of the GPL, Version 2 */
+/* This copyright does not cover user programs that use kernel services
+ * by normal system calls. */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <asm/uaccess.h>
+#include <linux/ctype.h>
+#include <linux/ip.h>
+#include <linux/vmalloc.h>
+#include <linux/moduleparam.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_recent.h>
+
+#undef DEBUG
+#define HASH_LOG 9
+
+/* Defaults, these can be overridden on the module command-line. */
+static int ip_list_tot = 100;
+static int ip_pkt_list_tot = 20;
+static int ip_list_hash_size = 0;
+static int ip_list_perms = 0644;
+#ifdef DEBUG
+static int debug = 1;
+#endif
+
+static char version[] =
+KERN_INFO RECENT_NAME " " RECENT_VER ": Stephen Frost <sfrost@snowman.net>.  http://snowman.net/projects/ipt_recent/\n";
+
+MODULE_AUTHOR("Stephen Frost <sfrost@snowman.net>");
+MODULE_DESCRIPTION("IP tables recently seen matching module " RECENT_VER);
+MODULE_LICENSE("GPL");
+module_param(ip_list_tot, int, 0400);
+module_param(ip_pkt_list_tot, int, 0400);
+module_param(ip_list_hash_size, int, 0400);
+module_param(ip_list_perms, int, 0400);
+#ifdef DEBUG
+module_param(debug, int, 0600);
+MODULE_PARM_DESC(debug,"debugging level, defaults to 1");
+#endif
+MODULE_PARM_DESC(ip_list_tot,"number of IPs to remember per list");
+MODULE_PARM_DESC(ip_pkt_list_tot,"number of packets per IP to remember");
+MODULE_PARM_DESC(ip_list_hash_size,"size of hash table used to look up IPs");
+MODULE_PARM_DESC(ip_list_perms,"permissions on /proc/net/ipt_recent/* files");
+
+/* Structure of our list of recently seen addresses. */
+struct recent_ip_list {
+	u_int32_t addr;
+	u_int8_t  ttl;
+	unsigned long last_seen;
+	unsigned long *last_pkts;
+	u_int32_t oldest_pkt;
+	u_int32_t hash_entry;
+	u_int32_t time_pos;
+};
+
+struct time_info_list {
+	u_int32_t position;
+	u_int32_t time;
+};
+
+/* Structure of our linked list of tables of recent lists. */
+struct recent_ip_tables {
+	char name[IPT_RECENT_NAME_LEN];
+	int count;
+	int time_pos;
+	struct recent_ip_list *table;
+	struct recent_ip_tables *next;
+	spinlock_t list_lock;
+	int *hash_table;
+	struct time_info_list *time_info;
+#ifdef CONFIG_PROC_FS
+	struct proc_dir_entry *status_proc;
+#endif /* CONFIG_PROC_FS */
+};
+
+/* Our current list of addresses we have recently seen.
+ * Only added to on a --set, and only updated on --set || --update 
+ */
+static struct recent_ip_tables *r_tables = NULL;
+
+/* We protect r_list with this spinlock so two processors are not modifying
+ * the list at the same time. 
+ */
+static DEFINE_SPINLOCK(recent_lock);
+
+#ifdef CONFIG_PROC_FS
+/* Our /proc/net/ipt_recent entry */
+static struct proc_dir_entry *proc_net_ipt_recent = NULL;
+#endif
+
+/* Function declaration for later. */
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop);
+
+/* Function to hash a given address into the hash table of table_size size */
+static int hash_func(unsigned int addr, int table_size)
+{
+	int result = 0;
+	unsigned int value = addr;
+	do { result ^= value; } while((value >>= HASH_LOG));
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": %d = hash_func(%u,%d)\n",
+			 result & (table_size - 1),
+			 addr,
+			 table_size);
+#endif
+
+	return(result & (table_size - 1));
+}
+
+#ifdef CONFIG_PROC_FS
+/* This is the function which produces the output for our /proc output
+ * interface which lists each IP address, the last seen time and the 
+ * other recent times the address was seen.
+ */
+
+static int ip_recent_get_info(char *buffer, char **start, off_t offset, int length, int *eof, void *data)
+{
+	int len = 0, count, last_len = 0, pkt_count;
+	off_t pos = 0;
+	off_t begin = 0;
+	struct recent_ip_tables *curr_table;
+
+	curr_table = (struct recent_ip_tables*) data;
+
+	spin_lock_bh(&curr_table->list_lock);
+	for(count = 0; count < ip_list_tot; count++) {
+		if(!curr_table->table[count].addr) continue;
+		last_len = len;
+		len += sprintf(buffer+len,"src=%u.%u.%u.%u ",NIPQUAD(curr_table->table[count].addr));
+		len += sprintf(buffer+len,"ttl: %u ",curr_table->table[count].ttl);
+		len += sprintf(buffer+len,"last_seen: %lu ",curr_table->table[count].last_seen);
+		len += sprintf(buffer+len,"oldest_pkt: %u ",curr_table->table[count].oldest_pkt);
+		len += sprintf(buffer+len,"last_pkts: %lu",curr_table->table[count].last_pkts[0]);
+		for(pkt_count = 1; pkt_count < ip_pkt_list_tot; pkt_count++) {
+			if(!curr_table->table[count].last_pkts[pkt_count]) break;
+			len += sprintf(buffer+len,", %lu",curr_table->table[count].last_pkts[pkt_count]);
+		}
+		len += sprintf(buffer+len,"\n");
+		pos = begin + len;
+		if(pos < offset) { len = 0; begin = pos; }
+		if(pos > offset + length) { len = last_len; break; }
+	}
+
+	*start = buffer + (offset - begin);
+	len -= (offset - begin);
+	if(len > length) len = length;
+
+	spin_unlock_bh(&curr_table->list_lock);
+	return len;
+}
+
+/* ip_recent_ctrl provides an interface for users to modify the table
+ * directly.  This allows adding entries, removing entries, and
+ * flushing the entire table.
+ * This is done by opening up the appropriate table for writing and
+ * sending one of:
+ * xx.xx.xx.xx   -- Add entry to table with current time
+ * +xx.xx.xx.xx  -- Add entry to table with current time
+ * -xx.xx.xx.xx  -- Remove entry from table
+ * clear         -- Flush table, remove all entries
+ */
+
+static int ip_recent_ctrl(struct file *file, const char __user *input, unsigned long size, void *data)
+{
+	static const u_int32_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
+	u_int32_t val;
+	int base, used = 0;
+	char c, *cp;
+	union iaddr {
+		uint8_t bytes[4];
+		uint32_t word;
+	} res;
+	uint8_t *pp = res.bytes;
+	int digit;
+
+	char buffer[20];
+	int len, check_set = 0, count;
+	u_int32_t addr = 0;
+	struct sk_buff *skb;
+	struct ipt_recent_info *info;
+	struct recent_ip_tables *curr_table;
+
+	curr_table = (struct recent_ip_tables*) data;
+
+	if(size > 20) len = 20; else len = size;
+
+	if(copy_from_user(buffer,input,len)) return -EFAULT;
+
+	if(len < 20) buffer[len] = '\0';
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": ip_recent_ctrl len: %d, input: `%.20s'\n",len,buffer);
+#endif
+
+	cp = buffer;
+	while(isspace(*cp)) { cp++; used++; if(used >= len-5) return used; }
+
+	/* Check if we are asked to flush the entire table */
+	if(!memcmp(cp,"clear",5)) {
+		used += 5;
+		spin_lock_bh(&curr_table->list_lock);
+		curr_table->time_pos = 0;
+		for(count = 0; count < ip_list_hash_size; count++) {
+			curr_table->hash_table[count] = -1;
+		}
+		for(count = 0; count < ip_list_tot; count++) {
+			curr_table->table[count].last_seen = 0;
+			curr_table->table[count].addr = 0;
+			curr_table->table[count].ttl = 0;
+			memset(curr_table->table[count].last_pkts,0,ip_pkt_list_tot*sizeof(u_int32_t));
+			curr_table->table[count].oldest_pkt = 0;
+			curr_table->table[count].time_pos = 0;
+			curr_table->time_info[count].position = count;
+			curr_table->time_info[count].time = 0;
+		}
+		spin_unlock_bh(&curr_table->list_lock);
+		return used;
+	}
+
+        check_set = IPT_RECENT_SET;
+	switch(*cp) {
+		case '+': check_set = IPT_RECENT_SET; cp++; used++; break;
+		case '-': check_set = IPT_RECENT_REMOVE; cp++; used++; break;
+		default: if(!isdigit(*cp)) return (used+1); break;
+	}
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": ip_recent_ctrl cp: `%c', check_set: %d\n",*cp,check_set);
+#endif
+	/* Get addr (effectively inet_aton()) */
+	/* Shamelessly stolen from libc, a function in the kernel for doing
+	 * this would, of course, be greatly preferred, but our options appear
+	 * to be rather limited, so we will just do it ourselves here.
+	 */
+	res.word = 0;
+
+	c = *cp;
+	for(;;) {
+		if(!isdigit(c)) return used;
+		val = 0; base = 10; digit = 0;
+		if(c == '0') {
+			c = *++cp;
+			if(c == 'x' || c == 'X') base = 16, c = *++cp;
+			else { base = 8; digit = 1; }
+		}
+		for(;;) {
+			if(isascii(c) && isdigit(c)) {
+				if(base == 8 && (c == '8' || c == '0')) return used;
+				val = (val * base) + (c - '0');
+				c = *++cp;
+				digit = 1;
+			} else if(base == 16 && isascii(c) && isxdigit(c)) {
+				val = (val << 4) | (c + 10 - (islower(c) ? 'a' : 'A'));
+				c = *++cp;
+				digit = 1;
+			} else break;
+		}
+		if(c == '.') {
+			if(pp > res.bytes + 2 || val > 0xff) return used;
+			*pp++ = val;
+			c = *++cp;
+		} else break;
+	}
+	used = cp - buffer;
+	if(c != '\0' && (!isascii(c) || !isspace(c))) return used;
+	if(c == '\n') used++;
+	if(!digit) return used;
+
+	if(val > max[pp - res.bytes]) return used;
+	addr = res.word | htonl(val);
+
+	if(!addr && check_set == IPT_RECENT_SET) return used;
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": ip_recent_ctrl c: %c, addr: %u used: %d\n",c,addr,used);
+#endif
+
+	/* Set up and just call match */
+	info = kmalloc(sizeof(struct ipt_recent_info),GFP_KERNEL);
+	if(!info) { return -ENOMEM; }
+	info->seconds = 0;
+	info->hit_count = 0;
+	info->check_set = check_set;
+	info->invert = 0;
+	info->side = IPT_RECENT_SOURCE;
+	strncpy(info->name,curr_table->name,IPT_RECENT_NAME_LEN);
+	info->name[IPT_RECENT_NAME_LEN-1] = '\0';
+
+	skb = kmalloc(sizeof(struct sk_buff),GFP_KERNEL);
+	if (!skb) {
+		used = -ENOMEM;
+		goto out_free_info;
+	}
+	skb->nh.iph = kmalloc(sizeof(struct iphdr),GFP_KERNEL);
+	if (!skb->nh.iph) {
+		used = -ENOMEM;
+		goto out_free_skb;
+	}
+
+	skb->nh.iph->saddr = addr;
+	skb->nh.iph->daddr = 0;
+	/* Clear ttl since we have no way of knowing it */
+	skb->nh.iph->ttl = 0;
+	match(skb,NULL,NULL,info,0,NULL);
+
+	kfree(skb->nh.iph);
+out_free_skb:
+	kfree(skb);
+out_free_info:
+	kfree(info);
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": Leaving ip_recent_ctrl addr: %u used: %d\n",addr,used);
+#endif
+	return used;
+}
+
+#endif /* CONFIG_PROC_FS */
+
+/* 'match' is our primary function, called by the kernel whenever a rule is
+ * hit with our module as an option to it.
+ * What this function does depends on what was specifically asked of it by
+ * the user:
+ * --set -- Add or update last seen time of the source address of the packet
+ *   -- matchinfo->check_set == IPT_RECENT_SET
+ * --rcheck -- Just check if the source address is in the list
+ *   -- matchinfo->check_set == IPT_RECENT_CHECK
+ * --update -- If the source address is in the list, update last_seen
+ *   -- matchinfo->check_set == IPT_RECENT_UPDATE
+ * --remove -- If the source address is in the list, remove it
+ *   -- matchinfo->check_set == IPT_RECENT_REMOVE
+ * --seconds -- Option to --rcheck/--update, only match if last_seen within seconds
+ *   -- matchinfo->seconds
+ * --hitcount -- Option to --rcheck/--update, only match if seen hitcount times
+ *   -- matchinfo->hit_count
+ * --seconds and --hitcount can be combined
+ */
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	int pkt_count, hits_found, ans;
+	unsigned long now;
+	const struct ipt_recent_info *info = matchinfo;
+	u_int32_t addr = 0, time_temp;
+	u_int8_t ttl = skb->nh.iph->ttl;
+	int *hash_table;
+	int orig_hash_result, hash_result, temp, location = 0, time_loc, end_collision_chain = -1;
+	struct time_info_list *time_info;
+	struct recent_ip_tables *curr_table;
+	struct recent_ip_tables *last_table;
+	struct recent_ip_list *r_list;
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": match() called\n");
+#endif
+
+	/* Default is false ^ info->invert */
+	ans = info->invert;
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": match(): name = '%s'\n",info->name);
+#endif
+
+	/* if out != NULL then routing has been done and TTL changed.
+	 * We change it back here internally for match what came in before routing. */
+	if(out) ttl++;
+
+	/* Find the right table */
+	spin_lock_bh(&recent_lock);
+	curr_table = r_tables;
+	while( (last_table = curr_table) && strncmp(info->name,curr_table->name,IPT_RECENT_NAME_LEN) && (curr_table = curr_table->next) );
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": match(): table found('%s')\n",info->name);
+#endif
+
+	spin_unlock_bh(&recent_lock);
+
+	/* Table with this name not found, match impossible */
+	if(!curr_table) { return ans; }
+
+	/* Make sure no one is changing the list while we work with it */
+	spin_lock_bh(&curr_table->list_lock);
+
+	r_list = curr_table->table;
+	if(info->side == IPT_RECENT_DEST) addr = skb->nh.iph->daddr; else addr = skb->nh.iph->saddr;
+
+	if(!addr) { 
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": match() address (%u) invalid, leaving.\n",addr);
+#endif
+		spin_unlock_bh(&curr_table->list_lock);
+		return ans;
+	}
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": match(): checking table, addr: %u, ttl: %u, orig_ttl: %u\n",addr,ttl,skb->nh.iph->ttl);
+#endif
+
+	/* Get jiffies now in case they changed while we were waiting for a lock */
+	now = jiffies;
+	hash_table = curr_table->hash_table;
+	time_info = curr_table->time_info;
+
+	orig_hash_result = hash_result = hash_func(addr,ip_list_hash_size);
+	/* Hash entry at this result used */
+	/* Check for TTL match if requested.  If TTL is zero then a match would never
+	 * happen, so match regardless of existing TTL in that case.  Zero means the
+	 * entry was added via the /proc interface anyway, so we will just use the
+	 * first TTL we get for that IP address. */
+	if(info->check_set & IPT_RECENT_TTL) {
+		while(hash_table[hash_result] != -1 && !(r_list[hash_table[hash_result]].addr == addr &&
+			(!r_list[hash_table[hash_result]].ttl || r_list[hash_table[hash_result]].ttl == ttl))) {
+			/* Collision in hash table */
+			hash_result = (hash_result + 1) % ip_list_hash_size;
+		}
+	} else {
+		while(hash_table[hash_result] != -1 && r_list[hash_table[hash_result]].addr != addr) {
+			/* Collision in hash table */
+			hash_result = (hash_result + 1) % ip_list_hash_size;
+		}
+	}
+
+	if(hash_table[hash_result] == -1 && !(info->check_set & IPT_RECENT_SET)) {
+		/* IP not in list and not asked to SET */
+		spin_unlock_bh(&curr_table->list_lock);
+		return ans;
+	}
+
+	/* Check if we need to handle the collision, do not need to on REMOVE */
+	if(orig_hash_result != hash_result && !(info->check_set & IPT_RECENT_REMOVE)) {
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": match(): Collision in hash table. (or: %d,hr: %d,oa: %u,ha: %u)\n",
+				 orig_hash_result,
+				 hash_result,
+				 r_list[hash_table[orig_hash_result]].addr,
+				 addr);
+#endif
+
+		/* We had a collision.
+		 * orig_hash_result is where we started, hash_result is where we ended up.
+		 * So, swap them because we are likely to see the same guy again sooner */
+#ifdef DEBUG
+		if(debug) {
+		  printk(KERN_INFO RECENT_NAME ": match(): Collision; hash_table[orig_hash_result] = %d\n",hash_table[orig_hash_result]);
+		  printk(KERN_INFO RECENT_NAME ": match(): Collision; r_list[hash_table[orig_hash_result]].hash_entry = %d\n",
+				r_list[hash_table[orig_hash_result]].hash_entry);
+		}
+#endif
+
+		r_list[hash_table[orig_hash_result]].hash_entry = hash_result;
+
+
+		temp = hash_table[orig_hash_result];
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": match(): Collision; hash_table[hash_result] = %d\n",hash_table[hash_result]);
+#endif
+		hash_table[orig_hash_result] = hash_table[hash_result];
+		hash_table[hash_result] = temp;
+		temp = hash_result;
+		hash_result = orig_hash_result;
+		orig_hash_result = temp;
+		time_info[r_list[hash_table[orig_hash_result]].time_pos].position = hash_table[orig_hash_result];
+		if(hash_table[hash_result] != -1) {
+			r_list[hash_table[hash_result]].hash_entry = hash_result;
+			time_info[r_list[hash_table[hash_result]].time_pos].position = hash_table[hash_result];
+		}
+
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": match(): Collision handled.\n");
+#endif
+	}
+
+	if(hash_table[hash_result] == -1) {
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": match(): New table entry. (hr: %d,ha: %u)\n",
+				 hash_result, addr);
+#endif
+
+		/* New item found and IPT_RECENT_SET, so we need to add it */
+		location = time_info[curr_table->time_pos].position;
+		hash_table[r_list[location].hash_entry] = -1;
+		hash_table[hash_result] = location;
+		memset(r_list[location].last_pkts,0,ip_pkt_list_tot*sizeof(u_int32_t));
+		r_list[location].time_pos = curr_table->time_pos;
+		r_list[location].addr = addr;
+		r_list[location].ttl = ttl;
+		r_list[location].last_seen = now;
+		r_list[location].oldest_pkt = 1;
+		r_list[location].last_pkts[0] = now;
+		r_list[location].hash_entry = hash_result;
+		time_info[curr_table->time_pos].time = r_list[location].last_seen;
+		curr_table->time_pos = (curr_table->time_pos + 1) % ip_list_tot;
+
+		ans = !info->invert;
+	} else {
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": match(): Existing table entry. (hr: %d,ha: %u)\n",
+				 hash_result,
+				 addr);
+#endif
+
+		/* Existing item found */
+		location = hash_table[hash_result];
+		/* We have a match on address, now to make sure it meets all requirements for a
+		 * full match. */
+		if(info->check_set & IPT_RECENT_CHECK || info->check_set & IPT_RECENT_UPDATE) {
+			if(!info->seconds && !info->hit_count) ans = !info->invert; else ans = info->invert;
+			if(info->seconds && !info->hit_count) {
+				if(time_before_eq(now,r_list[location].last_seen+info->seconds*HZ)) ans = !info->invert; else ans = info->invert;
+			}
+			if(info->seconds && info->hit_count) {
+				for(pkt_count = 0, hits_found = 0; pkt_count < ip_pkt_list_tot; pkt_count++) {
+					if(time_before_eq(now,r_list[location].last_pkts[pkt_count]+info->seconds*HZ)) hits_found++;
+				}
+				if(hits_found >= info->hit_count) ans = !info->invert; else ans = info->invert;
+			}
+			if(info->hit_count && !info->seconds) {
+				for(pkt_count = 0, hits_found = 0; pkt_count < ip_pkt_list_tot; pkt_count++) {
+					if(r_list[location].last_pkts[pkt_count] == 0) break;
+					hits_found++;
+				}
+				if(hits_found >= info->hit_count) ans = !info->invert; else ans = info->invert;
+			}
+		}
+#ifdef DEBUG
+		if(debug) {
+			if(ans)
+				printk(KERN_INFO RECENT_NAME ": match(): match addr: %u\n",addr);
+			else
+				printk(KERN_INFO RECENT_NAME ": match(): no match addr: %u\n",addr);
+		}
+#endif
+
+		/* If and only if we have been asked to SET, or to UPDATE (on match) do we add the
+		 * current timestamp to the last_seen. */
+		if((info->check_set & IPT_RECENT_SET && (ans = !info->invert)) || (info->check_set & IPT_RECENT_UPDATE && ans)) {
+#ifdef DEBUG
+			if(debug) printk(KERN_INFO RECENT_NAME ": match(): SET or UPDATE; updating time info.\n");
+#endif
+			/* Have to update our time info */
+			time_loc = r_list[location].time_pos;
+			time_info[time_loc].time = now;
+			time_info[time_loc].position = location;
+			while((time_info[(time_loc+1) % ip_list_tot].time < time_info[time_loc].time) && ((time_loc+1) % ip_list_tot) != curr_table->time_pos) {
+				time_temp = time_info[time_loc].time;
+				time_info[time_loc].time = time_info[(time_loc+1)%ip_list_tot].time;
+				time_info[(time_loc+1)%ip_list_tot].time = time_temp;
+				time_temp = time_info[time_loc].position;
+				time_info[time_loc].position = time_info[(time_loc+1)%ip_list_tot].position;
+				time_info[(time_loc+1)%ip_list_tot].position = time_temp;
+				r_list[time_info[time_loc].position].time_pos = time_loc;
+				r_list[time_info[(time_loc+1)%ip_list_tot].position].time_pos = (time_loc+1)%ip_list_tot;
+				time_loc = (time_loc+1) % ip_list_tot;
+			}
+			r_list[location].time_pos = time_loc;
+			r_list[location].ttl = ttl;
+			r_list[location].last_pkts[r_list[location].oldest_pkt] = now;
+			r_list[location].oldest_pkt = ++r_list[location].oldest_pkt % ip_pkt_list_tot;
+			r_list[location].last_seen = now;
+		}
+		/* If we have been asked to remove the entry from the list, just set it to 0 */
+		if(info->check_set & IPT_RECENT_REMOVE) {
+#ifdef DEBUG
+			if(debug) printk(KERN_INFO RECENT_NAME ": match(): REMOVE; clearing entry (or: %d, hr: %d).\n",orig_hash_result,hash_result);
+#endif
+			/* Check if this is part of a collision chain */
+			while(hash_table[(orig_hash_result+1) % ip_list_hash_size] != -1) {
+				orig_hash_result++;
+				if(hash_func(r_list[hash_table[orig_hash_result]].addr,ip_list_hash_size) == hash_result) {
+					/* Found collision chain, how deep does this rabbit hole go? */
+#ifdef DEBUG
+					if(debug) printk(KERN_INFO RECENT_NAME ": match(): REMOVE; found collision chain.\n");
+#endif
+					end_collision_chain = orig_hash_result;
+				}
+			}
+			if(end_collision_chain != -1) {
+#ifdef DEBUG
+				if(debug) printk(KERN_INFO RECENT_NAME ": match(): REMOVE; part of collision chain, moving to end.\n");
+#endif
+				/* Part of a collision chain, swap it with the end of the chain
+				 * before removing. */
+				r_list[hash_table[end_collision_chain]].hash_entry = hash_result;
+				temp = hash_table[end_collision_chain];
+				hash_table[end_collision_chain] = hash_table[hash_result];
+				hash_table[hash_result] = temp;
+				time_info[r_list[hash_table[hash_result]].time_pos].position = hash_table[hash_result];
+				hash_result = end_collision_chain;
+				r_list[hash_table[hash_result]].hash_entry = hash_result;
+				time_info[r_list[hash_table[hash_result]].time_pos].position = hash_table[hash_result];
+			}
+			location = hash_table[hash_result];
+			hash_table[r_list[location].hash_entry] = -1;
+			time_loc = r_list[location].time_pos;
+			time_info[time_loc].time = 0;
+			time_info[time_loc].position = location;
+			while((time_info[(time_loc+1) % ip_list_tot].time < time_info[time_loc].time) && ((time_loc+1) % ip_list_tot) != curr_table->time_pos) {
+				time_temp = time_info[time_loc].time;
+				time_info[time_loc].time = time_info[(time_loc+1)%ip_list_tot].time;
+				time_info[(time_loc+1)%ip_list_tot].time = time_temp;
+				time_temp = time_info[time_loc].position;
+				time_info[time_loc].position = time_info[(time_loc+1)%ip_list_tot].position;
+				time_info[(time_loc+1)%ip_list_tot].position = time_temp;
+				r_list[time_info[time_loc].position].time_pos = time_loc;
+				r_list[time_info[(time_loc+1)%ip_list_tot].position].time_pos = (time_loc+1)%ip_list_tot;
+				time_loc = (time_loc+1) % ip_list_tot;
+			}
+			r_list[location].time_pos = time_loc;
+			r_list[location].last_seen = 0;
+			r_list[location].addr = 0;
+			r_list[location].ttl = 0;
+			memset(r_list[location].last_pkts,0,ip_pkt_list_tot*sizeof(u_int32_t));
+			r_list[location].oldest_pkt = 0;
+			ans = !info->invert;
+		}
+		spin_unlock_bh(&curr_table->list_lock);
+		return ans;
+	}
+
+	spin_unlock_bh(&curr_table->list_lock);
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": match() left.\n");
+#endif
+	return ans;
+}
+
+/* This function is to verify that the rule given during the userspace iptables
+ * command is correct.
+ * If the command is valid then we check if the table name referred to by the
+ * rule exists, if not it is created.
+ */
+static int
+checkentry(const char *tablename,
+           const struct ipt_ip *ip,
+           void *matchinfo,
+           unsigned int matchsize,
+           unsigned int hook_mask)
+{
+	int flag = 0, c;
+	unsigned long *hold;
+	const struct ipt_recent_info *info = matchinfo;
+	struct recent_ip_tables *curr_table, *find_table, *last_table;
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": checkentry() entered.\n");
+#endif
+
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_recent_info))) return 0;
+
+	/* seconds and hit_count only valid for CHECK/UPDATE */
+	if(info->check_set & IPT_RECENT_SET) { flag++; if(info->seconds || info->hit_count) return 0; }
+	if(info->check_set & IPT_RECENT_REMOVE) { flag++; if(info->seconds || info->hit_count) return 0; }
+	if(info->check_set & IPT_RECENT_CHECK) flag++;
+	if(info->check_set & IPT_RECENT_UPDATE) flag++;
+
+	/* One and only one of these should ever be set */
+	if(flag != 1) return 0;
+
+	/* Name must be set to something */
+	if(!info->name || !info->name[0]) return 0;
+
+	/* Things look good, create a list for this if it does not exist */
+	/* Lock the linked list while we play with it */
+	spin_lock_bh(&recent_lock);
+
+	/* Look for an entry with this name already created */
+	/* Finds the end of the list and the entry before the end if current name does not exist */
+	find_table = r_tables;
+	while( (last_table = find_table) && strncmp(info->name,find_table->name,IPT_RECENT_NAME_LEN) && (find_table = find_table->next) );
+
+	/* If a table already exists just increment the count on that table and return */
+	if(find_table) { 
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": checkentry: table found (%s), incrementing count.\n",info->name);
+#endif
+		find_table->count++;
+		spin_unlock_bh(&recent_lock);
+		return 1;
+	}
+
+	spin_unlock_bh(&recent_lock);
+
+	/* Table with this name not found */
+	/* Allocate memory for new linked list item */
+
+#ifdef DEBUG
+	if(debug) {
+		printk(KERN_INFO RECENT_NAME ": checkentry: no table found (%s)\n",info->name);
+		printk(KERN_INFO RECENT_NAME ": checkentry: Allocationg %d for link-list entry.\n",sizeof(struct recent_ip_tables));
+	}
+#endif
+
+	curr_table = vmalloc(sizeof(struct recent_ip_tables));
+	if(curr_table == NULL) return 0;
+
+	spin_lock_init(&curr_table->list_lock);
+	curr_table->next = NULL;
+	curr_table->count = 1;
+	curr_table->time_pos = 0;
+	strncpy(curr_table->name,info->name,IPT_RECENT_NAME_LEN);
+	curr_table->name[IPT_RECENT_NAME_LEN-1] = '\0';
+
+	/* Allocate memory for this table and the list of packets in each entry. */
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": checkentry: Allocating %d for table (%s).\n",
+			sizeof(struct recent_ip_list)*ip_list_tot,
+			info->name);
+#endif
+
+	curr_table->table = vmalloc(sizeof(struct recent_ip_list)*ip_list_tot);
+	if(curr_table->table == NULL) { vfree(curr_table); return 0; }
+	memset(curr_table->table,0,sizeof(struct recent_ip_list)*ip_list_tot);
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": checkentry: Allocating %d for pkt_list.\n",
+			sizeof(u_int32_t)*ip_pkt_list_tot*ip_list_tot);
+#endif
+
+	hold = vmalloc(sizeof(u_int32_t)*ip_pkt_list_tot*ip_list_tot);
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": checkentry: After pkt_list allocation.\n");
+#endif
+	if(hold == NULL) { 
+		printk(KERN_INFO RECENT_NAME ": checkentry: unable to allocate for pkt_list.\n");
+		vfree(curr_table->table); 
+		vfree(curr_table);
+		return 0;
+	}
+	for(c = 0; c < ip_list_tot; c++) {
+		curr_table->table[c].last_pkts = hold + c*ip_pkt_list_tot;
+	}
+
+	/* Allocate memory for the hash table */
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": checkentry: Allocating %d for hash_table.\n",
+			sizeof(int)*ip_list_hash_size);
+#endif
+
+	curr_table->hash_table = vmalloc(sizeof(int)*ip_list_hash_size);
+	if(!curr_table->hash_table) {
+		printk(KERN_INFO RECENT_NAME ": checkentry: unable to allocate for hash_table.\n");
+		vfree(hold);
+		vfree(curr_table->table); 
+		vfree(curr_table);
+		return 0;
+	}
+
+	for(c = 0; c < ip_list_hash_size; c++) {
+		curr_table->hash_table[c] = -1;
+	}
+
+	/* Allocate memory for the time info */
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": checkentry: Allocating %d for time_info.\n",
+			sizeof(struct time_info_list)*ip_list_tot);
+#endif
+
+	curr_table->time_info = vmalloc(sizeof(struct time_info_list)*ip_list_tot);
+	if(!curr_table->time_info) {
+		printk(KERN_INFO RECENT_NAME ": checkentry: unable to allocate for time_info.\n");
+		vfree(curr_table->hash_table);
+		vfree(hold);
+		vfree(curr_table->table); 
+		vfree(curr_table);
+		return 0;
+	}
+	for(c = 0; c < ip_list_tot; c++) {
+		curr_table->time_info[c].position = c;
+		curr_table->time_info[c].time = 0;
+	}
+
+	/* Put the new table in place */
+	spin_lock_bh(&recent_lock);
+	find_table = r_tables;
+	while( (last_table = find_table) && strncmp(info->name,find_table->name,IPT_RECENT_NAME_LEN) && (find_table = find_table->next) );
+
+	/* If a table already exists just increment the count on that table and return */
+	if(find_table) { 
+		find_table->count++;	
+		spin_unlock_bh(&recent_lock);
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": checkentry: table found (%s), created by other process.\n",info->name);
+#endif
+		vfree(curr_table->time_info);
+		vfree(curr_table->hash_table);
+		vfree(hold);
+		vfree(curr_table->table);
+		vfree(curr_table);
+		return 1;
+	}
+	if(!last_table) r_tables = curr_table; else last_table->next = curr_table;
+
+	spin_unlock_bh(&recent_lock);
+
+#ifdef CONFIG_PROC_FS
+	/* Create our proc 'status' entry. */
+	curr_table->status_proc = create_proc_entry(curr_table->name, ip_list_perms, proc_net_ipt_recent);
+	if (!curr_table->status_proc) {
+		printk(KERN_INFO RECENT_NAME ": checkentry: unable to allocate for /proc entry.\n");
+		/* Destroy the created table */
+		spin_lock_bh(&recent_lock);
+		last_table = NULL;
+		curr_table = r_tables;
+		if(!curr_table) {
+#ifdef DEBUG
+			if(debug) printk(KERN_INFO RECENT_NAME ": checkentry() create_proc failed, no tables.\n");
+#endif
+			spin_unlock_bh(&recent_lock);
+			return 0;
+		}
+		while( strncmp(info->name,curr_table->name,IPT_RECENT_NAME_LEN) && (last_table = curr_table) && (curr_table = curr_table->next) );
+		if(!curr_table) {
+#ifdef DEBUG
+			if(debug) printk(KERN_INFO RECENT_NAME ": checkentry() create_proc failed, table already destroyed.\n");
+#endif
+			spin_unlock_bh(&recent_lock);
+			return 0;
+		}
+		if(last_table) last_table->next = curr_table->next; else r_tables = curr_table->next;
+		spin_unlock_bh(&recent_lock);
+		vfree(curr_table->time_info);
+		vfree(curr_table->hash_table);
+		vfree(hold);
+		vfree(curr_table->table);
+		vfree(curr_table);
+		return 0;
+	}
+	
+	curr_table->status_proc->owner = THIS_MODULE;
+	curr_table->status_proc->data = curr_table;
+	wmb();
+	curr_table->status_proc->read_proc = ip_recent_get_info;
+	curr_table->status_proc->write_proc = ip_recent_ctrl;
+#endif /* CONFIG_PROC_FS */
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": checkentry() left.\n");
+#endif
+
+	return 1;
+}
+
+/* This function is called in the event that a rule matching this module is
+ * removed.
+ * When this happens we need to check if there are no other rules matching
+ * the table given.  If that is the case then we remove the table and clean
+ * up its memory.
+ */
+static void
+destroy(void *matchinfo, unsigned int matchsize)
+{
+	const struct ipt_recent_info *info = matchinfo;
+	struct recent_ip_tables *curr_table, *last_table;
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": destroy() entered.\n");
+#endif
+
+	if(matchsize != IPT_ALIGN(sizeof(struct ipt_recent_info))) return;
+
+	/* Lock the linked list while we play with it */
+	spin_lock_bh(&recent_lock);
+
+	/* Look for an entry with this name already created */
+	/* Finds the end of the list and the entry before the end if current name does not exist */
+	last_table = NULL;
+	curr_table = r_tables;
+	if(!curr_table) { 
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": destroy() No tables found, leaving.\n");
+#endif
+		spin_unlock_bh(&recent_lock);
+		return;
+	}
+	while( strncmp(info->name,curr_table->name,IPT_RECENT_NAME_LEN) && (last_table = curr_table) && (curr_table = curr_table->next) );
+
+	/* If a table does not exist then do nothing and return */
+	if(!curr_table) { 
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": destroy() table not found, leaving.\n");
+#endif
+		spin_unlock_bh(&recent_lock);
+		return;
+	}
+
+	curr_table->count--;
+
+	/* If count is still non-zero then there are still rules referenceing it so we do nothing */
+	if(curr_table->count) { 
+#ifdef DEBUG
+		if(debug) printk(KERN_INFO RECENT_NAME ": destroy() table found, non-zero count, leaving.\n");
+#endif
+		spin_unlock_bh(&recent_lock);
+		return;
+	}
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": destroy() table found, zero count, removing.\n");
+#endif
+
+	/* Count must be zero so we remove this table from the list */
+	if(last_table) last_table->next = curr_table->next; else r_tables = curr_table->next;
+
+	spin_unlock_bh(&recent_lock);
+
+	/* lock to make sure any late-runners still using this after we removed it from
+	 * the list finish up then remove everything */
+	spin_lock_bh(&curr_table->list_lock);
+	spin_unlock_bh(&curr_table->list_lock);
+
+#ifdef CONFIG_PROC_FS
+	if(curr_table->status_proc) remove_proc_entry(curr_table->name,proc_net_ipt_recent);
+#endif /* CONFIG_PROC_FS */
+	vfree(curr_table->table[0].last_pkts);
+	vfree(curr_table->table);
+	vfree(curr_table->hash_table);
+	vfree(curr_table->time_info);
+	vfree(curr_table);
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": destroy() left.\n");
+#endif
+
+	return;
+}
+
+/* This is the structure we pass to ipt_register to register our
+ * module with iptables.
+ */
+static struct ipt_match recent_match = { 
+  .name = "recent", 
+  .match = &match, 
+  .checkentry = &checkentry, 
+  .destroy = &destroy, 
+  .me = THIS_MODULE
+};
+
+/* Kernel module initialization. */
+static int __init init(void)
+{
+	int err, count;
+
+	printk(version);
+#ifdef CONFIG_PROC_FS
+	proc_net_ipt_recent = proc_mkdir("ipt_recent",proc_net);
+	if(!proc_net_ipt_recent) return -ENOMEM;
+#endif
+
+	if(ip_list_hash_size && ip_list_hash_size <= ip_list_tot) {
+	  printk(KERN_WARNING RECENT_NAME ": ip_list_hash_size too small, resetting to default.\n");
+	  ip_list_hash_size = 0;
+	}
+
+	if(!ip_list_hash_size) {
+		ip_list_hash_size = ip_list_tot*3;
+		count = 2*2;
+		while(ip_list_hash_size > count) count = count*2;
+		ip_list_hash_size = count;
+	}
+
+#ifdef DEBUG
+	if(debug) printk(KERN_INFO RECENT_NAME ": ip_list_hash_size: %d\n",ip_list_hash_size);
+#endif
+
+	err = ipt_register_match(&recent_match);
+	if (err)
+		remove_proc_entry("ipt_recent", proc_net);
+	return err;
+}
+
+/* Kernel module destruction. */
+static void __exit fini(void)
+{
+	ipt_unregister_match(&recent_match);
+
+	remove_proc_entry("ipt_recent",proc_net);
+}
+
+/* Register our module with the kernel. */
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_sctp.c b/net/ipv4/netfilter/ipt_sctp.c
new file mode 100644
index 000000000000..fe2b327bcaa4
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_sctp.c
@@ -0,0 +1,203 @@
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/ip.h>
+#include <linux/sctp.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_sctp.h>
+
+#ifdef DEBUG_SCTP
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+#define SCCHECK(cond, option, flag, invflag) (!((flag) & (option)) \
+					      || (!!((invflag) & (option)) ^ (cond)))
+
+static int
+match_flags(const struct ipt_sctp_flag_info *flag_info,
+	    const int flag_count,
+	    u_int8_t chunktype,
+	    u_int8_t chunkflags)
+{
+	int i;
+
+	for (i = 0; i < flag_count; i++) {
+		if (flag_info[i].chunktype == chunktype) {
+			return (chunkflags & flag_info[i].flag_mask) == flag_info[i].flag;
+		}
+	}
+
+	return 1;
+}
+
+static int
+match_packet(const struct sk_buff *skb,
+	     const u_int32_t *chunkmap,
+	     int chunk_match_type,
+	     const struct ipt_sctp_flag_info *flag_info,
+	     const int flag_count,
+	     int *hotdrop)
+{
+	int offset;
+	u_int32_t chunkmapcopy[256 / sizeof (u_int32_t)];
+	sctp_chunkhdr_t _sch, *sch;
+
+#ifdef DEBUG_SCTP
+	int i = 0;
+#endif
+
+	if (chunk_match_type == SCTP_CHUNK_MATCH_ALL) {
+		SCTP_CHUNKMAP_COPY(chunkmapcopy, chunkmap);
+	}
+
+	offset = skb->nh.iph->ihl * 4 + sizeof (sctp_sctphdr_t);
+	do {
+		sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch);
+		if (sch == NULL) {
+			duprintf("Dropping invalid SCTP packet.\n");
+			*hotdrop = 1;
+			return 0;
+        	}
+
+		duprintf("Chunk num: %d\toffset: %d\ttype: %d\tlength: %d\tflags: %x\n", 
+				++i, offset, sch->type, htons(sch->length), sch->flags);
+
+		offset += (htons(sch->length) + 3) & ~3;
+
+		duprintf("skb->len: %d\toffset: %d\n", skb->len, offset);
+
+		if (SCTP_CHUNKMAP_IS_SET(chunkmap, sch->type)) {
+			switch (chunk_match_type) {
+			case SCTP_CHUNK_MATCH_ANY:
+				if (match_flags(flag_info, flag_count, 
+					sch->type, sch->flags)) {
+					return 1;
+				}
+				break;
+
+			case SCTP_CHUNK_MATCH_ALL:
+				if (match_flags(flag_info, flag_count, 
+					sch->type, sch->flags)) {
+					SCTP_CHUNKMAP_CLEAR(chunkmapcopy, sch->type);
+				}
+				break;
+
+			case SCTP_CHUNK_MATCH_ONLY:
+				if (!match_flags(flag_info, flag_count, 
+					sch->type, sch->flags)) {
+					return 0;
+				}
+				break;
+			}
+		} else {
+			switch (chunk_match_type) {
+			case SCTP_CHUNK_MATCH_ONLY:
+				return 0;
+			}
+		}
+	} while (offset < skb->len);
+
+	switch (chunk_match_type) {
+	case SCTP_CHUNK_MATCH_ALL:
+		return SCTP_CHUNKMAP_IS_CLEAR(chunkmap);
+	case SCTP_CHUNK_MATCH_ANY:
+		return 0;
+	case SCTP_CHUNK_MATCH_ONLY:
+		return 1;
+	}
+
+	/* This will never be reached, but required to stop compiler whine */
+	return 0;
+}
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_sctp_info *info;
+	sctp_sctphdr_t _sh, *sh;
+
+	info = (const struct ipt_sctp_info *)matchinfo;
+
+	if (offset) {
+		duprintf("Dropping non-first fragment.. FIXME\n");
+		return 0;
+	}
+	
+	sh = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_sh), &_sh);
+	if (sh == NULL) {
+		duprintf("Dropping evil TCP offset=0 tinygram.\n");
+		*hotdrop = 1;
+		return 0;
+       	}
+	duprintf("spt: %d\tdpt: %d\n", ntohs(sh->source), ntohs(sh->dest));
+
+	return  SCCHECK(((ntohs(sh->source) >= info->spts[0]) 
+			&& (ntohs(sh->source) <= info->spts[1])), 
+		   	IPT_SCTP_SRC_PORTS, info->flags, info->invflags)
+		&& SCCHECK(((ntohs(sh->dest) >= info->dpts[0]) 
+			&& (ntohs(sh->dest) <= info->dpts[1])), 
+			IPT_SCTP_DEST_PORTS, info->flags, info->invflags)
+		&& SCCHECK(match_packet(skb, info->chunkmap, info->chunk_match_type,
+ 					info->flag_info, info->flag_count, 
+					hotdrop),
+			   IPT_SCTP_CHUNK_TYPES, info->flags, info->invflags);
+}
+
+static int
+checkentry(const char *tablename,
+	   const struct ipt_ip *ip,
+	   void *matchinfo,
+	   unsigned int matchsize,
+	   unsigned int hook_mask)
+{
+	const struct ipt_sctp_info *info;
+
+	info = (const struct ipt_sctp_info *)matchinfo;
+
+	return ip->proto == IPPROTO_SCTP
+		&& !(ip->invflags & IPT_INV_PROTO)
+		&& matchsize == IPT_ALIGN(sizeof(struct ipt_sctp_info))
+		&& !(info->flags & ~IPT_SCTP_VALID_FLAGS)
+		&& !(info->invflags & ~IPT_SCTP_VALID_FLAGS)
+		&& !(info->invflags & ~info->flags)
+		&& ((!(info->flags & IPT_SCTP_CHUNK_TYPES)) || 
+			(info->chunk_match_type &
+				(SCTP_CHUNK_MATCH_ALL 
+				| SCTP_CHUNK_MATCH_ANY
+				| SCTP_CHUNK_MATCH_ONLY)));
+}
+
+static struct ipt_match sctp_match = 
+{ 
+	.list = { NULL, NULL},
+	.name = "sctp",
+	.match = &match,
+	.checkentry = &checkentry,
+	.destroy = NULL,
+	.me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&sctp_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&sctp_match);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kiran Kumar Immidi");
+MODULE_DESCRIPTION("Match for SCTP protocol packets");
+
diff --git a/net/ipv4/netfilter/ipt_state.c b/net/ipv4/netfilter/ipt_state.c
new file mode 100644
index 000000000000..b1511b97ea5f
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_state.c
@@ -0,0 +1,74 @@
+/* Kernel module to match connection tracking information. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_state.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
+MODULE_DESCRIPTION("iptables connection tracking state match module");
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_state_info *sinfo = matchinfo;
+	enum ip_conntrack_info ctinfo;
+	unsigned int statebit;
+
+	if (skb->nfct == &ip_conntrack_untracked.ct_general)
+		statebit = IPT_STATE_UNTRACKED;
+	else if (!ip_conntrack_get(skb, &ctinfo))
+		statebit = IPT_STATE_INVALID;
+	else
+		statebit = IPT_STATE_BIT(ctinfo);
+
+	return (sinfo->statemask & statebit);
+}
+
+static int check(const char *tablename,
+		 const struct ipt_ip *ip,
+		 void *matchinfo,
+		 unsigned int matchsize,
+		 unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_state_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match state_match = {
+	.name		= "state",
+	.match		= &match,
+	.checkentry	= &check,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	need_ip_conntrack();
+	return ipt_register_match(&state_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&state_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_tcpmss.c b/net/ipv4/netfilter/ipt_tcpmss.c
new file mode 100644
index 000000000000..4dc9b16ab4a3
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_tcpmss.c
@@ -0,0 +1,127 @@
+/* Kernel module to match TCP MSS values. */
+
+/* Copyright (C) 2000 Marc Boucher <marc@mbsi.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter_ipv4/ipt_tcpmss.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+#define TH_SYN 0x02
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("iptables TCP MSS match module");
+
+/* Returns 1 if the mss option is set and matched by the range, 0 otherwise */
+static inline int
+mssoption_match(u_int16_t min, u_int16_t max,
+		const struct sk_buff *skb,
+		int invert,
+		int *hotdrop)
+{
+	struct tcphdr _tcph, *th;
+	/* tcp.doff is only 4 bits, ie. max 15 * 4 bytes */
+	u8 _opt[15 * 4 - sizeof(_tcph)], *op;
+	unsigned int i, optlen;
+
+	/* If we don't have the whole header, drop packet. */
+	th = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
+				sizeof(_tcph), &_tcph);
+	if (th == NULL)
+		goto dropit;
+
+	/* Malformed. */
+	if (th->doff*4 < sizeof(*th))
+		goto dropit;
+
+	optlen = th->doff*4 - sizeof(*th);
+	if (!optlen)
+		goto out;
+
+	/* Truncated options. */
+	op = skb_header_pointer(skb, skb->nh.iph->ihl * 4 + sizeof(*th),
+				optlen, _opt);
+	if (op == NULL)
+		goto dropit;
+
+	for (i = 0; i < optlen; ) {
+		if (op[i] == TCPOPT_MSS
+		    && (optlen - i) >= TCPOLEN_MSS
+		    && op[i+1] == TCPOLEN_MSS) {
+			u_int16_t mssval;
+
+			mssval = (op[i+2] << 8) | op[i+3];
+			
+			return (mssval >= min && mssval <= max) ^ invert;
+		}
+		if (op[i] < 2) i++;
+		else i += op[i+1]?:1;
+	}
+out:
+	return invert;
+
+ dropit:
+	*hotdrop = 1;
+	return 0;
+}
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_tcpmss_match_info *info = matchinfo;
+
+	return mssoption_match(info->mss_min, info->mss_max, skb,
+			       info->invert, hotdrop);
+}
+
+static int
+checkentry(const char *tablename,
+           const struct ipt_ip *ip,
+           void *matchinfo,
+           unsigned int matchsize,
+           unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_tcpmss_match_info)))
+		return 0;
+
+	/* Must specify -p tcp */
+	if (ip->proto != IPPROTO_TCP || (ip->invflags & IPT_INV_PROTO)) {
+		printk("tcpmss: Only works on TCP packets\n");
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_match tcpmss_match = {
+	.name		= "tcpmss",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&tcpmss_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&tcpmss_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_tos.c b/net/ipv4/netfilter/ipt_tos.c
new file mode 100644
index 000000000000..086a1bb61e3e
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_tos.c
@@ -0,0 +1,64 @@
+/* Kernel module to match TOS values. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ipt_tos.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("iptables TOS match module");
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      int *hotdrop)
+{
+	const struct ipt_tos_info *info = matchinfo;
+
+	return (skb->nh.iph->tos == info->tos) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+           const struct ipt_ip *ip,
+           void *matchinfo,
+           unsigned int matchsize,
+           unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_tos_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match tos_match = {
+	.name		= "tos",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&tos_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&tos_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/ipt_ttl.c b/net/ipv4/netfilter/ipt_ttl.c
new file mode 100644
index 000000000000..219aa9de88cc
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_ttl.c
@@ -0,0 +1,79 @@
+/* IP tables module for matching the value of the TTL 
+ *
+ * ipt_ttl.c,v 1.5 2000/11/13 11:16:08 laforge Exp
+ *
+ * (C) 2000,2001 by Harald Welte <laforge@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ipt_ttl.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("IP tables TTL matching module");
+MODULE_LICENSE("GPL");
+
+static int match(const struct sk_buff *skb, const struct net_device *in,
+		 const struct net_device *out, const void *matchinfo,
+		 int offset, int *hotdrop)
+{
+	const struct ipt_ttl_info *info = matchinfo;
+
+	switch (info->mode) {
+		case IPT_TTL_EQ:
+			return (skb->nh.iph->ttl == info->ttl);
+			break;
+		case IPT_TTL_NE:
+			return (!(skb->nh.iph->ttl == info->ttl));
+			break;
+		case IPT_TTL_LT:
+			return (skb->nh.iph->ttl < info->ttl);
+			break;
+		case IPT_TTL_GT:
+			return (skb->nh.iph->ttl > info->ttl);
+			break;
+		default:
+			printk(KERN_WARNING "ipt_ttl: unknown mode %d\n", 
+				info->mode);
+			return 0;
+	}
+
+	return 0;
+}
+
+static int checkentry(const char *tablename, const struct ipt_ip *ip,
+		      void *matchinfo, unsigned int matchsize,
+		      unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_ttl_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match ttl_match = {
+	.name		= "ttl",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&ttl_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&ttl_match);
+
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/iptable_filter.c b/net/ipv4/netfilter/iptable_filter.c
new file mode 100644
index 000000000000..260a4f0a2a90
--- /dev/null
+++ b/net/ipv4/netfilter/iptable_filter.c
@@ -0,0 +1,194 @@
+/*
+ * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables filter table");
+
+#define FILTER_VALID_HOOKS ((1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT))
+
+static struct
+{
+	struct ipt_replace repl;
+	struct ipt_standard entries[3];
+	struct ipt_error term;
+} initial_table __initdata 
+= { { "filter", FILTER_VALID_HOOKS, 4,
+      sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
+      { [NF_IP_LOCAL_IN] = 0,
+	[NF_IP_FORWARD] = sizeof(struct ipt_standard),
+	[NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
+      { [NF_IP_LOCAL_IN] = 0,
+	[NF_IP_FORWARD] = sizeof(struct ipt_standard),
+	[NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
+      0, NULL, { } },
+    {
+	    /* LOCAL_IN */
+	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } },
+	    /* FORWARD */
+	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } },
+	    /* LOCAL_OUT */
+	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } }
+    },
+    /* ERROR */
+    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+	0,
+	sizeof(struct ipt_entry),
+	sizeof(struct ipt_error),
+	0, { 0, 0 }, { } },
+      { { { { IPT_ALIGN(sizeof(struct ipt_error_target)), IPT_ERROR_TARGET } },
+	  { } },
+	"ERROR"
+      }
+    }
+};
+
+static struct ipt_table packet_filter = {
+	.name		= "filter",
+	.valid_hooks	= FILTER_VALID_HOOKS,
+	.lock		= RW_LOCK_UNLOCKED,
+	.me		= THIS_MODULE
+};
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+ipt_hook(unsigned int hook,
+	 struct sk_buff **pskb,
+	 const struct net_device *in,
+	 const struct net_device *out,
+	 int (*okfn)(struct sk_buff *))
+{
+	return ipt_do_table(pskb, hook, in, out, &packet_filter, NULL);
+}
+
+static unsigned int
+ipt_local_out_hook(unsigned int hook,
+		   struct sk_buff **pskb,
+		   const struct net_device *in,
+		   const struct net_device *out,
+		   int (*okfn)(struct sk_buff *))
+{
+	/* root is playing with raw sockets. */
+	if ((*pskb)->len < sizeof(struct iphdr)
+	    || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+		if (net_ratelimit())
+			printk("ipt_hook: happy cracking.\n");
+		return NF_ACCEPT;
+	}
+
+	return ipt_do_table(pskb, hook, in, out, &packet_filter, NULL);
+}
+
+static struct nf_hook_ops ipt_ops[] = {
+	{
+		.hook		= ipt_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET,
+		.hooknum	= NF_IP_LOCAL_IN,
+		.priority	= NF_IP_PRI_FILTER,
+	},
+	{
+		.hook		= ipt_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET,
+		.hooknum	= NF_IP_FORWARD,
+		.priority	= NF_IP_PRI_FILTER,
+	},
+	{
+		.hook		= ipt_local_out_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET,
+		.hooknum	= NF_IP_LOCAL_OUT,
+		.priority	= NF_IP_PRI_FILTER,
+	},
+};
+
+/* Default to forward because I got too much mail already. */
+static int forward = NF_ACCEPT;
+module_param(forward, bool, 0000);
+
+static int __init init(void)
+{
+	int ret;
+
+	if (forward < 0 || forward > NF_MAX_VERDICT) {
+		printk("iptables forward must be 0 or 1\n");
+		return -EINVAL;
+	}
+
+	/* Entry 1 is the FORWARD hook */
+	initial_table.entries[1].target.verdict = -forward - 1;
+
+	/* Register table */
+	ret = ipt_register_table(&packet_filter, &initial_table.repl);
+	if (ret < 0)
+		return ret;
+
+	/* Register hooks */
+	ret = nf_register_hook(&ipt_ops[0]);
+	if (ret < 0)
+		goto cleanup_table;
+
+	ret = nf_register_hook(&ipt_ops[1]);
+	if (ret < 0)
+		goto cleanup_hook0;
+
+	ret = nf_register_hook(&ipt_ops[2]);
+	if (ret < 0)
+		goto cleanup_hook1;
+
+	return ret;
+
+ cleanup_hook1:
+	nf_unregister_hook(&ipt_ops[1]);
+ cleanup_hook0:
+	nf_unregister_hook(&ipt_ops[0]);
+ cleanup_table:
+	ipt_unregister_table(&packet_filter);
+
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < sizeof(ipt_ops)/sizeof(struct nf_hook_ops); i++)
+		nf_unregister_hook(&ipt_ops[i]);
+
+	ipt_unregister_table(&packet_filter);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
new file mode 100644
index 000000000000..160eb11b6e2f
--- /dev/null
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -0,0 +1,260 @@
+/*
+ * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Extended to all five netfilter hooks by Brad Chapman & Harald Welte
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/route.h>
+#include <linux/ip.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables mangle table");
+
+#define MANGLE_VALID_HOOKS ((1 << NF_IP_PRE_ROUTING) | \
+			    (1 << NF_IP_LOCAL_IN) | \
+			    (1 << NF_IP_FORWARD) | \
+			    (1 << NF_IP_LOCAL_OUT) | \
+			    (1 << NF_IP_POST_ROUTING))
+
+/* Ouch - five different hooks? Maybe this should be a config option..... -- BC */
+static struct
+{
+	struct ipt_replace repl;
+	struct ipt_standard entries[5];
+	struct ipt_error term;
+} initial_table __initdata
+= { { "mangle", MANGLE_VALID_HOOKS, 6,
+      sizeof(struct ipt_standard) * 5 + sizeof(struct ipt_error),
+      { [NF_IP_PRE_ROUTING] 	= 0,
+	[NF_IP_LOCAL_IN] 	= sizeof(struct ipt_standard),
+	[NF_IP_FORWARD] 	= sizeof(struct ipt_standard) * 2,
+	[NF_IP_LOCAL_OUT] 	= sizeof(struct ipt_standard) * 3,
+	[NF_IP_POST_ROUTING] 	= sizeof(struct ipt_standard) * 4 },
+      { [NF_IP_PRE_ROUTING] 	= 0,
+	[NF_IP_LOCAL_IN] 	= sizeof(struct ipt_standard),
+	[NF_IP_FORWARD] 	= sizeof(struct ipt_standard) * 2,
+	[NF_IP_LOCAL_OUT] 	= sizeof(struct ipt_standard) * 3,
+	[NF_IP_POST_ROUTING]	= sizeof(struct ipt_standard) * 4 },
+      0, NULL, { } },
+    {
+	    /* PRE_ROUTING */
+	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } },
+	    /* LOCAL_IN */
+ 	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } },
+	    /* FORWARD */
+ 	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } },
+	    /* LOCAL_OUT */
+	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } },
+	    /* POST_ROUTING */
+	    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+		0,
+		sizeof(struct ipt_entry),
+		sizeof(struct ipt_standard),
+		0, { 0, 0 }, { } },
+	      { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
+		-NF_ACCEPT - 1 } },
+    },
+    /* ERROR */
+    { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
+	0,
+	sizeof(struct ipt_entry),
+	sizeof(struct ipt_error),
+	0, { 0, 0 }, { } },
+      { { { { IPT_ALIGN(sizeof(struct ipt_error_target)), IPT_ERROR_TARGET } },
+	  { } },
+	"ERROR"
+      }
+    }
+};
+
+static struct ipt_table packet_mangler = {
+	.name		= "mangle",
+	.valid_hooks	= MANGLE_VALID_HOOKS,
+	.lock		= RW_LOCK_UNLOCKED,
+	.me		= THIS_MODULE,
+};
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+ipt_route_hook(unsigned int hook,
+	 struct sk_buff **pskb,
+	 const struct net_device *in,
+	 const struct net_device *out,
+	 int (*okfn)(struct sk_buff *))
+{
+	return ipt_do_table(pskb, hook, in, out, &packet_mangler, NULL);
+}
+
+static unsigned int
+ipt_local_hook(unsigned int hook,
+		   struct sk_buff **pskb,
+		   const struct net_device *in,
+		   const struct net_device *out,
+		   int (*okfn)(struct sk_buff *))
+{
+	unsigned int ret;
+	u_int8_t tos;
+	u_int32_t saddr, daddr;
+	unsigned long nfmark;
+
+	/* root is playing with raw sockets. */
+	if ((*pskb)->len < sizeof(struct iphdr)
+	    || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+		if (net_ratelimit())
+			printk("ipt_hook: happy cracking.\n");
+		return NF_ACCEPT;
+	}
+
+	/* Save things which could affect route */
+	nfmark = (*pskb)->nfmark;
+	saddr = (*pskb)->nh.iph->saddr;
+	daddr = (*pskb)->nh.iph->daddr;
+	tos = (*pskb)->nh.iph->tos;
+
+	ret = ipt_do_table(pskb, hook, in, out, &packet_mangler, NULL);
+	/* Reroute for ANY change. */
+	if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE
+	    && ((*pskb)->nh.iph->saddr != saddr
+		|| (*pskb)->nh.iph->daddr != daddr
+#ifdef CONFIG_IP_ROUTE_FWMARK
+		|| (*pskb)->nfmark != nfmark
+#endif
+		|| (*pskb)->nh.iph->tos != tos))
+		return ip_route_me_harder(pskb) == 0 ? ret : NF_DROP;
+
+	return ret;
+}
+
+static struct nf_hook_ops ipt_ops[] = {
+	{
+		.hook		= ipt_route_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET,
+		.hooknum	= NF_IP_PRE_ROUTING, 
+		.priority	= NF_IP_PRI_MANGLE,
+	},
+	{
+		.hook		= ipt_route_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET,
+		.hooknum	= NF_IP_LOCAL_IN,
+		.priority	= NF_IP_PRI_MANGLE,
+	},
+	{
+		.hook		= ipt_route_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET,
+		.hooknum	= NF_IP_FORWARD,
+		.priority	= NF_IP_PRI_MANGLE,
+	},
+	{
+		.hook		= ipt_local_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET,
+		.hooknum	= NF_IP_LOCAL_OUT,
+		.priority	= NF_IP_PRI_MANGLE,
+	},
+	{
+		.hook		= ipt_route_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET,
+		.hooknum	= NF_IP_POST_ROUTING,
+		.priority	= NF_IP_PRI_MANGLE,
+	},
+};
+
+static int __init init(void)
+{
+	int ret;
+
+	/* Register table */
+	ret = ipt_register_table(&packet_mangler, &initial_table.repl);
+	if (ret < 0)
+		return ret;
+
+	/* Register hooks */
+	ret = nf_register_hook(&ipt_ops[0]);
+	if (ret < 0)
+		goto cleanup_table;
+
+	ret = nf_register_hook(&ipt_ops[1]);
+	if (ret < 0)
+		goto cleanup_hook0;
+
+	ret = nf_register_hook(&ipt_ops[2]);
+	if (ret < 0)
+		goto cleanup_hook1;
+
+	ret = nf_register_hook(&ipt_ops[3]);
+	if (ret < 0)
+		goto cleanup_hook2;
+
+	ret = nf_register_hook(&ipt_ops[4]);
+	if (ret < 0)
+		goto cleanup_hook3;
+
+	return ret;
+
+ cleanup_hook3:
+        nf_unregister_hook(&ipt_ops[3]);
+ cleanup_hook2:
+        nf_unregister_hook(&ipt_ops[2]);
+ cleanup_hook1:
+	nf_unregister_hook(&ipt_ops[1]);
+ cleanup_hook0:
+	nf_unregister_hook(&ipt_ops[0]);
+ cleanup_table:
+	ipt_unregister_table(&packet_mangler);
+
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < sizeof(ipt_ops)/sizeof(struct nf_hook_ops); i++)
+		nf_unregister_hook(&ipt_ops[i]);
+
+	ipt_unregister_table(&packet_mangler);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/ipv4/netfilter/iptable_raw.c b/net/ipv4/netfilter/iptable_raw.c
new file mode 100644
index 000000000000..01b4a3c814d3
--- /dev/null
+++ b/net/ipv4/netfilter/iptable_raw.c
@@ -0,0 +1,156 @@
+/* 
+ * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
+ *
+ * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ */
+#include <linux/module.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+#define RAW_VALID_HOOKS ((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT))
+
+static struct
+{
+	struct ipt_replace repl;
+	struct ipt_standard entries[2];
+	struct ipt_error term;
+} initial_table __initdata = {
+	.repl = {
+		.name = "raw", 
+		.valid_hooks = RAW_VALID_HOOKS, 
+		.num_entries = 3,
+		.size = sizeof(struct ipt_standard) * 2 + sizeof(struct ipt_error),
+		.hook_entry = { 
+			[NF_IP_PRE_ROUTING] = 0,
+			[NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) },
+		.underflow = { 
+			[NF_IP_PRE_ROUTING] = 0,
+			[NF_IP_LOCAL_OUT]  = sizeof(struct ipt_standard) },
+	},
+	.entries = {
+	     /* PRE_ROUTING */
+	     { 
+		     .entry = { 
+			     .target_offset = sizeof(struct ipt_entry),
+			     .next_offset = sizeof(struct ipt_standard),
+		     },
+		     .target = { 
+			  .target = { 
+				  .u = {
+					  .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)),
+				  },
+			  },
+			  .verdict = -NF_ACCEPT - 1,
+		     },
+	     },
+
+	     /* LOCAL_OUT */
+	     {
+		     .entry = {
+			     .target_offset = sizeof(struct ipt_entry),
+			     .next_offset = sizeof(struct ipt_standard),
+		     },
+		     .target = {
+			     .target = {
+				     .u = {
+					     .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)),
+				     },
+			     },
+			     .verdict = -NF_ACCEPT - 1,
+		     },
+	     },
+	},
+	/* ERROR */
+	.term = {
+		.entry = {
+			.target_offset = sizeof(struct ipt_entry),
+			.next_offset = sizeof(struct ipt_error),
+		},
+		.target = {
+			.target = {
+				.u = {
+					.user = {
+						.target_size = IPT_ALIGN(sizeof(struct ipt_error_target)), 
+						.name = IPT_ERROR_TARGET,
+					},
+				},
+			},
+			.errorname = "ERROR",
+		},
+	}
+};
+
+static struct ipt_table packet_raw = { 
+	.name = "raw", 
+	.valid_hooks =  RAW_VALID_HOOKS, 
+	.lock = RW_LOCK_UNLOCKED, 
+	.me = THIS_MODULE
+};
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+ipt_hook(unsigned int hook,
+	 struct sk_buff **pskb,
+	 const struct net_device *in,
+	 const struct net_device *out,
+	 int (*okfn)(struct sk_buff *))
+{
+	return ipt_do_table(pskb, hook, in, out, &packet_raw, NULL);
+}
+
+/* 'raw' is the very first table. */
+static struct nf_hook_ops ipt_ops[] = {
+	{
+	  .hook = ipt_hook, 
+	  .pf = PF_INET, 
+	  .hooknum = NF_IP_PRE_ROUTING, 
+	  .priority = NF_IP_PRI_RAW
+	},
+	{
+	  .hook = ipt_hook, 
+	  .pf = PF_INET, 
+	  .hooknum = NF_IP_LOCAL_OUT, 
+	  .priority = NF_IP_PRI_RAW
+	},
+};
+
+static int __init init(void)
+{
+	int ret;
+
+	/* Register table */
+	ret = ipt_register_table(&packet_raw, &initial_table.repl);
+	if (ret < 0)
+		return ret;
+
+	/* Register hooks */
+	ret = nf_register_hook(&ipt_ops[0]);
+	if (ret < 0)
+		goto cleanup_table;
+
+	ret = nf_register_hook(&ipt_ops[1]);
+	if (ret < 0)
+		goto cleanup_hook0;
+
+	return ret;
+
+ cleanup_hook0:
+	nf_unregister_hook(&ipt_ops[0]);
+ cleanup_table:
+	ipt_unregister_table(&packet_raw);
+
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < sizeof(ipt_ops)/sizeof(struct nf_hook_ops); i++)
+		nf_unregister_hook(&ipt_ops[i]);
+
+	ipt_unregister_table(&packet_raw);
+}
+
+module_init(init);
+module_exit(fini);
+MODULE_LICENSE("GPL");