# SPDX-License-Identifier: GPL-2.0-only
menu "Core Netfilter Configuration"
depends on INET && NETFILTER
config NETFILTER_INGRESS
bool "Netfilter ingress support"
default y
select NET_INGRESS
help
This allows you to classify packets from ingress using the Netfilter
infrastructure.
config NETFILTER_EGRESS
bool "Netfilter egress support"
default y
select NET_EGRESS
help
This allows you to classify packets before transmission using the
Netfilter infrastructure.
config NETFILTER_SKIP_EGRESS
def_bool NETFILTER_EGRESS && (NET_CLS_ACT || IFB)
config NETFILTER_NETLINK
tristate
config NETFILTER_FAMILY_BRIDGE
bool
config NETFILTER_FAMILY_ARP
bool
config NETFILTER_NETLINK_HOOK
tristate "Netfilter base hook dump support"
depends on NETFILTER_ADVANCED
depends on NF_TABLES
select NETFILTER_NETLINK
help
If this option is enabled, the kernel will include support
to list the base netfilter hooks via NFNETLINK.
This is helpful for debugging.
config NETFILTER_NETLINK_ACCT
tristate "Netfilter NFACCT over NFNETLINK interface"
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK
help
If this option is enabled, the kernel will include support
for extended accounting via NFNETLINK.
config NETFILTER_NETLINK_QUEUE
tristate "Netfilter NFQUEUE over NFNETLINK interface"
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK
help
If this option is enabled, the kernel will include support
for queueing packets via NFNETLINK.
config NETFILTER_NETLINK_LOG
tristate "Netfilter LOG over NFNETLINK interface"
default m if NETFILTER_ADVANCED=n
select NETFILTER_NETLINK
help
If this option is enabled, the kernel will include support
for logging packets via NFNETLINK.
This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,
and is also scheduled to replace the old syslog-based ipt_LOG
and ip6t_LOG modules.
config NETFILTER_NETLINK_OSF
tristate "Netfilter OSF over NFNETLINK interface"
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK
help
If this option is enabled, the kernel will include support
for passive OS fingerprint via NFNETLINK.
config NF_CONNTRACK
tristate "Netfilter connection tracking support"
default m if NETFILTER_ADVANCED=n
select NF_DEFRAG_IPV4
select NF_DEFRAG_IPV6 if IPV6 != n
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. 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 NF_LOG_SYSLOG
tristate "Syslog packet logging"
default m if NETFILTER_ADVANCED=n
help
This option enable support for packet logging via syslog.
It supports IPv4, IPV6, ARP and common transport protocols such
as TCP and UDP.
This is a simpler but less flexible logging method compared to
CONFIG_NETFILTER_NETLINK_LOG.
If both are enabled the backend to use can be configured at run-time
by means of per-address-family sysctl tunables.
if NF_CONNTRACK
config NETFILTER_CONNCOUNT
tristate
config NF_CONNTRACK_MARK
bool 'Connection mark tracking support'
depends on NETFILTER_ADVANCED
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 NF_CONNTRACK_SECMARK
bool 'Connection tracking security mark support'
depends on NETWORK_SECMARK
default y if NETFILTER_ADVANCED=n
help
This option enables security markings to be applied to
connections. Typically they are copied to connections from
packets using the CONNSECMARK target and copied back from
connections to packets with the same target, with the packets
being originally labeled via SECMARK.
If unsure, say 'N'.
config NF_CONNTRACK_ZONES
bool 'Connection tracking zones'
depends on NETFILTER_ADVANCED
help
This option enables support for connection tracking zones.
Normally, each connection needs to have a unique system wide
identity. Connection tracking zones allow to have multiple
connections using the same identity, as long as they are
contained in different zones.
If unsure, say `N'.
config NF_CONNTRACK_PROCFS
bool "Supply CT list in procfs (OBSOLETE)"
default y
depends on PROC_FS
help
This option enables for the list of known conntrack entries
to be shown in procfs under net/netfilter/nf_conntrack. This
is considered obsolete in favor of using the conntrack(8)
tool which uses Netlink.
config NF_CONNTRACK_EVENTS
bool "Connection tracking events"
depends on NETFILTER_ADVANCED
help
If this option is enabled, the connection tracking code will
provide a notifier chain that can be used by other kernel code
to get notified about changes in the connection tracking state.
If unsure, say `N'.
config NF_CONNTRACK_TIMEOUT
bool 'Connection tracking timeout'
depends on NETFILTER_ADVANCED
help
This option enables support for connection tracking timeout
extension. This allows you to attach timeout policies to flow
via the CT target.
If unsure, say `N'.
config NF_CONNTRACK_TIMESTAMP
bool 'Connection tracking timestamping'
depends on NETFILTER_ADVANCED
help
This option enables support for connection tracking timestamping.
This allows you to store the flow start-time and to obtain
the flow-stop time (once it has been destroyed) via Connection
tracking events.
If unsure, say `N'.
config NF_CONNTRACK_LABELS
bool "Connection tracking labels"
help
This option enables support for assigning user-defined flag bits
to connection tracking entries. It can be used with xtables connlabel
match and the nftables ct expression.
config NF_CT_PROTO_DCCP
bool 'DCCP protocol connection tracking support'
depends on NETFILTER_ADVANCED
default y
help
With this option enabled, the layer 3 independent connection
tracking code will be able to do state tracking on DCCP connections.
If unsure, say Y.
config NF_CT_PROTO_GRE
bool
config NF_CT_PROTO_SCTP
bool 'SCTP protocol connection tracking support'
depends on NETFILTER_ADVANCED
default y
select LIBCRC32C
help
With this option enabled, the layer 3 independent connection
tracking code will be able to do state tracking on SCTP connections.
If unsure, say Y.
config NF_CT_PROTO_UDPLITE
bool 'UDP-Lite protocol connection tracking support'
depends on NETFILTER_ADVANCED
default y
help
With this option enabled, the layer 3 independent connection
tracking code will be able to do state tracking on UDP-Lite
connections.
If unsure, say Y.
config NF_CONNTRACK_AMANDA
tristate "Amanda backup protocol support"
depends on NETFILTER_ADVANCED
select TEXTSEARCH
select TEXTSEARCH_KMP
help
If you are running the Amanda backup package
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 N.
config NF_CONNTRACK_FTP
tristate "FTP protocol support"
default m if NETFILTER_ADVANCED=n
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.
This is FTP support on Layer 3 independent connection tracking.
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_H323
tristate "H.323 protocol support"
depends on IPV6 || IPV6=n
depends on NETFILTER_ADVANCED
help
H.323 is a VoIP signalling protocol from ITU-T. As one of the most
important VoIP protocols, it is widely used by voice hardware and
software including voice gateways, IP phones, Netmeeting, OpenPhone,
Gnomemeeting, etc.
With this module you can support H.323 on a connection tracking/NAT
firewall.
This module supports RAS, Fast Start, H.245 Tunnelling, Call
Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
whiteboard, file transfer, etc. For more information, please
visit http://nath323.sourceforge.net/.
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_IRC
tristate "IRC protocol support"
default m if NETFILTER_ADVANCED=n
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 N.
config NF_CONNTRACK_BROADCAST
tristate
config NF_CONNTRACK_NETBIOS_NS
tristate "NetBIOS name service protocol support"
select NF_CONNTRACK_BROADCAST
help
NetBIOS name service requests are sent as broadcast messages from an
unprivileged port and responded to with unicast messages to the
same port. This make them hard to firewall properly because connection
tracking doesn't deal with broadcasts. This helper tracks locally
originating NetBIOS name service requests and the corresponding
responses. It relies on correct IP address configuration, specifically
netmask and broadcast address. When properly configured, the output
of "ip address show" should look similar to this:
$ ip -4 address show eth0
4: eth0: mtu 1500 qdisc pfifo_fast qlen 1000
inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_SNMP
tristate "SNMP service protocol support"
depends on NETFILTER_ADVANCED
select NF_CONNTRACK_BROADCAST
help
SNMP service requests are sent as broadcast messages from an
unprivileged port and responded to with unicast messages to the
same port. This make them hard to firewall properly because connection
tracking doesn't deal with broadcasts. This helper tracks locally
originating SNMP service requests and the corresponding
responses. It relies on correct IP address configuration, specifically
netmask and broadcast address.
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_PPTP
tristate "PPtP protocol support"
depends on NETFILTER_ADVANCED
select NF_CT_PROTO_GRE
help
This module adds support for PPTP (Point to Point Tunnelling
Protocol, RFC2637) connection tracking and NAT.
If you are running PPTP sessions over a stateful firewall or NAT
box, you may want to enable this feature.
Please note that not all PPTP modes of operation are supported yet.
Specifically these limitations exist:
- Blindly assumes that control connections are always established
in PNS->PAC direction. This is a violation of RFC2637.
- Only supports a single call within each session
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_SANE
tristate "SANE protocol support"
depends on NETFILTER_ADVANCED
help
SANE is a protocol for remote access to scanners as implemented
by the 'saned' daemon. Like FTP, it uses separate control and
data connections.
With this module you can support SANE on a connection tracking
firewall.
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_SIP
tristate "SIP protocol support"
default m if NETFILTER_ADVANCED=n
help
SIP is an application-layer control protocol that can establish,
modify, and terminate multimedia sessions (conferences) such as
Internet telephony calls. With the nf_conntrack_sip and
the nf_nat_sip modules you can support the protocol on a connection
tracking/NATing firewall.
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_TFTP
tristate "TFTP protocol support"
depends on NETFILTER_ADVANCED
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 N.
config NF_CT_NETLINK
tristate 'Connection tracking netlink interface'
select NETFILTER_NETLINK
default m if NETFILTER_ADVANCED=n
help
This option enables support for a netlink-based userspace interface
config NF_CT_NETLINK_TIMEOUT
tristate 'Connection tracking timeout tuning via Netlink'
select NETFILTER_NETLINK
depends on NETFILTER_ADVANCED
depends on NF_CONNTRACK_TIMEOUT
help
This option enables support for connection tracking timeout
fine-grain tuning. This allows you to attach specific timeout
policies to flows, instead of using the global timeout policy.
If unsure, say `N'.
config NF_CT_NETLINK_HELPER
tristate 'Connection tracking helpers in user-space via Netlink'
select NETFILTER_NETLINK
depends on NF_CT_NETLINK
depends on NETFILTER_NETLINK_QUEUE
depends on NETFILTER_NETLINK_GLUE_CT
depends on NETFILTER_ADVANCED
help
This option enables the user-space connection tracking helpers
infrastructure.
If unsure, say `N'.
config NETFILTER_NETLINK_GLUE_CT
bool "NFQUEUE and NFLOG integration with Connection Tracking"
default n
depends on (NETFILTER_NETLINK_QUEUE || NETFILTER_NETLINK_LOG) && NF_CT_NETLINK
help
If this option is enabled, NFQUEUE and NFLOG can include
Connection Tracking information together with the packet is
the enqueued via NFNETLINK.
config NF_NAT
tristate "Network Address Translation support"
depends on NF_CONNTRACK
default m if NETFILTER_ADVANCED=n
help
The NAT option allows masquerading, port forwarding and other
forms of full Network Address Port Translation. This can be
controlled by iptables, ip6tables or nft.
config NF_NAT_AMANDA
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_AMANDA
config NF_NAT_FTP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_FTP
config NF_NAT_IRC
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_IRC
config NF_NAT_SIP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_SIP
config NF_NAT_TFTP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_TFTP
config NF_NAT_REDIRECT
bool
config NF_NAT_MASQUERADE
bool
config NETFILTER_SYNPROXY
tristate
endif # NF_CONNTRACK
config NF_TABLES
select NETFILTER_NETLINK
select LIBCRC32C
tristate "Netfilter nf_tables support"
help
nftables is the new packet classification framework that intends to
replace the existing {ip,ip6,arp,eb}_tables infrastructure. It
provides a pseudo-state machine with an extensible instruction-set
(also known as expressions) that the userspace 'nft' utility
(https://www.netfilter.org/projects/nftables) uses to build the
rule-set. It also comes with the generic set infrastructure that
allows you to construct mappings between matchings and actions
for performance lookups.
To compile it as a module, choose M here.
if NF_TABLES
config NF_TABLES_INET
depends on IPV6
select NF_TABLES_IPV4
select NF_TABLES_IPV6
bool "Netfilter nf_tables mixed IPv4/IPv6 tables support"
help
This option enables support for a mixed IPv4/IPv6 "inet" table.
config NF_TABLES_NETDEV
bool "Netfilter nf_tables netdev tables support"
help
This option enables support for the "netdev" table.
config NFT_NUMGEN
tristate "Netfilter nf_tables number generator module"
help
This option adds the number generator expression used to perform
incremental counting and random numbers bound to a upper limit.
config NFT_CT
depends on NF_CONNTRACK
tristate "Netfilter nf_tables conntrack module"
help
This option adds the "ct" expression that you can use to match
connection tracking information such as the flow state.
config NFT_FLOW_OFFLOAD
depends on NF_CONNTRACK && NF_FLOW_TABLE
tristate "Netfilter nf_tables hardware flow offload module"
help
This option adds the "flow_offload" expression that you can use to
choose what flows are placed into the hardware.
config NFT_CONNLIMIT
tristate "Netfilter nf_tables connlimit module"
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NETFILTER_CONNCOUNT
help
This option adds the "connlimit" expression that you can use to
ratelimit rule matchings per connections.
config NFT_LOG
tristate "Netfilter nf_tables log module"
help
This option adds the "log" expression that you can use to log
packets matching some criteria.
config NFT_LIMIT
tristate "Netfilter nf_tables limit module"
help
This option adds the "limit" expression that you can use to
ratelimit rule matchings.
config NFT_MASQ
depends on NF_CONNTRACK
depends on NF_NAT
select NF_NAT_MASQUERADE
tristate "Netfilter nf_tables masquerade support"
help
This option adds the "masquerade" expression that you can use
to perform NAT in the masquerade flavour.
config NFT_REDIR
depends on NF_CONNTRACK
depends on NF_NAT
tristate "Netfilter nf_tables redirect support"
select NF_NAT_REDIRECT
help
This options adds the "redirect" expression that you can use
to perform NAT in the redirect flavour.
config NFT_NAT
depends on NF_CONNTRACK
select NF_NAT
depends on NF_TABLES_IPV4 || NF_TABLES_IPV6
tristate "Netfilter nf_tables nat module"
help
This option adds the "nat" expression that you can use to perform
typical Network Address Translation (NAT) packet transformations.
config NFT_TUNNEL
tristate "Netfilter nf_tables tunnel module"
help
This option adds the "tunnel" expression that you can use to set
tunneling policies.
config NFT_OBJREF
tristate "Netfilter nf_tables stateful object reference module"
help
This option adds the "objref" expression that allows you to refer to
stateful objects, such as counters and quotas.
config NFT_QUEUE
depends on NETFILTER_NETLINK_QUEUE
tristate "Netfilter nf_tables queue module"
help
This is required if you intend to use the userspace queueing
infrastructure (also known as NFQUEUE) from nftables.
config NFT_QUOTA
tristate "Netfilter nf_tables quota module"
help
This option adds the "quota" expression that you can use to match
enforce bytes quotas.
config NFT_REJECT
default m if NETFILTER_ADVANCED=n
tristate "Netfilter nf_tables reject support"
depends on !NF_TABLES_INET || (IPV6!=m || m)
help
This option adds the "reject" expression that you can use to
explicitly deny and notify via TCP reset/ICMP informational errors
unallowed traffic.
config NFT_REJECT_INET
depends on NF_TABLES_INET
default NFT_REJECT
tristate
config NFT_COMPAT
depends on NETFILTER_XTABLES
tristate "Netfilter x_tables over nf_tables module"
help
This is required if you intend to use any of existing
x_tables match/target extensions over the nf_tables
framework.
config NFT_HASH
tristate "Netfilter nf_tables hash module"
help
This option adds the "hash" expression that you can use to perform
a hash operation on registers.
config NFT_FIB
tristate
config NFT_FIB_INET
depends on NF_TABLES_INET
depends on NFT_FIB_IPV4
depends on NFT_FIB_IPV6
tristate "Netfilter nf_tables fib inet support"
help
This option allows using the FIB expression from the inet table.
The lookup will be delegated to the IPv4 or IPv6 FIB depending
on the protocol of the packet.
config NFT_XFRM
tristate "Netfilter nf_tables xfrm/IPSec security association matching"
depends on XFRM
help
This option adds an expression that you can use to extract properties
of a packets security association.
config NFT_SOCKET
tristate "Netfilter nf_tables socket match support"
depends on IPV6 || IPV6=n
select NF_SOCKET_IPV4
select NF_SOCKET_IPV6 if NF_TABLES_IPV6
help
This option allows matching for the presence or absence of a
corresponding socket and its attributes.
config NFT_OSF
tristate "Netfilter nf_tables passive OS fingerprint support"
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK_OSF
help
This option allows matching packets from an specific OS.
config NFT_TPROXY
tristate "Netfilter nf_tables tproxy support"
depends on IPV6 || IPV6=n
select NF_DEFRAG_IPV4
select NF_DEFRAG_IPV6 if NF_TABLES_IPV6
select NF_TPROXY_IPV4
select NF_TPROXY_IPV6 if NF_TABLES_IPV6
help
This makes transparent proxy support available in nftables.
config NFT_SYNPROXY
tristate "Netfilter nf_tables SYNPROXY expression support"
depends on NF_CONNTRACK && NETFILTER_ADVANCED
select NETFILTER_SYNPROXY
select SYN_COOKIES
help
The SYNPROXY expression allows you to intercept TCP connections and
establish them using syncookies before they are passed on to the
server. This allows to avoid conntrack and server resource usage
during SYN-flood attacks.
if NF_TABLES_NETDEV
config NF_DUP_NETDEV
tristate "Netfilter packet duplication support"
help
This option enables the generic packet duplication infrastructure
for Netfilter.
config NFT_DUP_NETDEV
tristate "Netfilter nf_tables netdev packet duplication support"
select NF_DUP_NETDEV
help
This option enables packet duplication for the "netdev" family.
config NFT_FWD_NETDEV
tristate "Netfilter nf_tables netdev packet forwarding support"
select NF_DUP_NETDEV
help
This option enables packet forwarding for the "netdev" family.
config NFT_FIB_NETDEV
depends on NFT_FIB_IPV4
depends on NFT_FIB_IPV6
tristate "Netfilter nf_tables netdev fib lookups support"
help
This option allows using the FIB expression from the netdev table.
The lookup will be delegated to the IPv4 or IPv6 FIB depending
on the protocol of the packet.
config NFT_REJECT_NETDEV
depends on NFT_REJECT_IPV4
depends on NFT_REJECT_IPV6
tristate "Netfilter nf_tables netdev REJECT support"
help
This option enables the REJECT support from the netdev table.
The return packet generation will be delegated to the IPv4
or IPv6 ICMP or TCP RST implementation depending on the
protocol of the packet.
endif # NF_TABLES_NETDEV
endif # NF_TABLES
config NF_FLOW_TABLE_INET
tristate "Netfilter flow table mixed IPv4/IPv6 module"
depends on NF_FLOW_TABLE
help
This option adds the flow table mixed IPv4/IPv6 support.
To compile it as a module, choose M here.
config NF_FLOW_TABLE
tristate "Netfilter flow table module"
depends on NETFILTER_INGRESS
depends on NF_CONNTRACK
depends on NF_TABLES
help
This option adds the flow table core infrastructure.
To compile it as a module, choose M here.
config NETFILTER_XTABLES
tristate "Netfilter Xtables support (required for ip_tables)"
default m if NETFILTER_ADVANCED=n
help
This is required if you intend to use any of ip_tables,
ip6_tables or arp_tables.
if NETFILTER_XTABLES
config NETFILTER_XTABLES_COMPAT
bool "Netfilter Xtables 32bit support"
depends on COMPAT
default y
help
This option provides a translation layer to run 32bit arp,ip(6),ebtables
binaries on 64bit kernels.
If unsure, say N.
comment "Xtables combined modules"
config NETFILTER_XT_MARK
tristate 'nfmark target and match support'
default m if NETFILTER_ADVANCED=n
help
This option adds the "MARK" target and "mark" match.
Netfilter mark matching allows you to match packets based on the
"nfmark" value in the packet.
The target allows you to create rules in the "mangle" table which alter
the netfilter mark (nfmark) field associated with the packet.
Prior to routing, the nfmark can influence the routing method and can
also be used by other subsystems to change their behavior.
config NETFILTER_XT_CONNMARK
tristate 'ctmark target and match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NF_CONNTRACK_MARK
help
This option adds the "CONNMARK" target and "connmark" match.
Netfilter allows you to store a mark value per connection (a.k.a.
ctmark), similarly to the packet mark (nfmark). Using this
target and match, you can set and match on this mark.
config NETFILTER_XT_SET
tristate 'set target and match support'
depends on IP_SET
depends on NETFILTER_ADVANCED
help
This option adds the "SET" target and "set" match.
Using this target and match, you can add/delete and match
elements in the sets created by ipset(8).
To compile it as a module, choose M here. If unsure, say N.
# alphabetically ordered list of targets
comment "Xtables targets"
config NETFILTER_XT_TARGET_AUDIT
tristate "AUDIT target support"
depends on AUDIT
depends on NETFILTER_ADVANCED
help
This option adds a 'AUDIT' target, which can be used to create
audit records for packets dropped/accepted.
To compileit as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_CHECKSUM
tristate "CHECKSUM target support"
depends on IP_NF_MANGLE || IP6_NF_MANGLE
depends on NETFILTER_ADVANCED
help
This option adds a `CHECKSUM' target, which can be used in the iptables mangle
table to work around buggy DHCP clients in virtualized environments.
Some old DHCP clients drop packets because they are not aware
that the checksum would normally be offloaded to hardware and
thus should be considered valid.
This target can be used to fill in the checksum using iptables
when such packets are sent via a virtual network device.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_CLASSIFY
tristate '"CLASSIFY" target support'
depends on NETFILTER_ADVANCED
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 NETFILTER_XT_TARGET_CONNMARK
tristate '"CONNMARK" target support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NETFILTER_XT_CONNMARK
help
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects
CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
config NETFILTER_XT_TARGET_CONNSECMARK
tristate '"CONNSECMARK" target support'
depends on NF_CONNTRACK && NF_CONNTRACK_SECMARK
default m if NETFILTER_ADVANCED=n
help
The CONNSECMARK target copies security markings from packets
to connections, and restores security markings from connections
to packets (if the packets are not already marked). This would
normally be used in conjunction with the SECMARK target.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_CT
tristate '"CT" target support'
depends on NF_CONNTRACK
depends on IP_NF_RAW || IP6_NF_RAW
depends on NETFILTER_ADVANCED
help
This options adds a `CT' target, which allows to specify initial
connection tracking parameters like events to be delivered and
the helper to be used.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_DSCP
tristate '"DSCP" and "TOS" target support'
depends on IP_NF_MANGLE || IP6_NF_MANGLE
depends on NETFILTER_ADVANCED
help
This option adds a `DSCP' target, which allows you to manipulate
the IPv4/IPv6 header DSCP field (differentiated services codepoint).
The DSCP field can have any value between 0x0 and 0x3f inclusive.
It also adds the "TOS" target, which allows you to create rules in
the "mangle" table which alter the Type Of Service field of an IPv4
or the Priority field of an IPv6 packet, prior to routing.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_HL
tristate '"HL" hoplimit target support'
depends on IP_NF_MANGLE || IP6_NF_MANGLE
depends on NETFILTER_ADVANCED
help
This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
targets, which enable the user to change the
hoplimit/time-to-live value of the IP header.
While it is safe to decrement the hoplimit/TTL value, the
modules also allow to increment and set the hoplimit value of
the header to arbitrary values. This is EXTREMELY DANGEROUS
since you can easily create immortal packets that loop
forever on the network.
config NETFILTER_XT_TARGET_HMARK
tristate '"HMARK" target support'
depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
depends on NETFILTER_ADVANCED
help
This option adds the "HMARK" target.
The target allows you to create rules in the "raw" and "mangle" tables
which set the skbuff mark by means of hash calculation within a given
range. The nfmark can influence the routing method and can also be used
by other subsystems to change their behaviour.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_IDLETIMER
tristate "IDLETIMER target support"
depends on NETFILTER_ADVANCED
help
This option adds the `IDLETIMER' target. Each matching packet
resets the timer associated with label specified when the rule is
added. When the timer expires, it triggers a sysfs notification.
The remaining time for expiration can be read via sysfs.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_LED
tristate '"LED" target support'
depends on LEDS_CLASS && LEDS_TRIGGERS
depends on NETFILTER_ADVANCED
help
This option adds a `LED' target, which allows you to blink LEDs in
response to particular packets passing through your machine.
This can be used to turn a spare LED into a network activity LED,
which only flashes in response to FTP transfers, for example. Or
you could have an LED which lights up for a minute or two every time
somebody connects to your machine via SSH.
You will need support for the "led" class to make this work.
To create an LED trigger for incoming SSH traffic:
iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
Then attach the new trigger to an LED on your system:
echo netfilter-ssh > /sys/class/leds//trigger
For more information on the LEDs available on your system, see
Documentation/leds/leds-class.rst
config NETFILTER_XT_TARGET_LOG
tristate "LOG target support"
select NF_LOG_SYSLOG
select NF_LOG_IPV6 if IP6_NF_IPTABLES
default m if NETFILTER_ADVANCED=n
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 NETFILTER_XT_TARGET_MARK
tristate '"MARK" target support'
depends on NETFILTER_ADVANCED
select NETFILTER_XT_MARK
help
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects
CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
config NETFILTER_XT_NAT
tristate '"SNAT and DNAT" targets support'
depends on NF_NAT
help
This option enables the SNAT and DNAT targets.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_NETMAP
tristate '"NETMAP" target support'
depends on 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.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_NFLOG
tristate '"NFLOG" target support'
default m if NETFILTER_ADVANCED=n
select NETFILTER_NETLINK_LOG
help
This option enables the NFLOG target, which allows to LOG
messages through nfnetlink_log.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_NFQUEUE
tristate '"NFQUEUE" target Support'
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK_QUEUE
help
This target replaced the old obsolete QUEUE target.
As opposed to QUEUE, it supports 65535 different queues,
not just one.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_NOTRACK
tristate '"NOTRACK" target support (DEPRECATED)'
depends on NF_CONNTRACK
depends on IP_NF_RAW || IP6_NF_RAW
depends on NETFILTER_ADVANCED
select NETFILTER_XT_TARGET_CT
config NETFILTER_XT_TARGET_RATEEST
tristate '"RATEEST" target support'
depends on NETFILTER_ADVANCED
help
This option adds a `RATEEST' target, which allows to measure
rates similar to TC estimators. The `rateest' match can be
used to match on the measured rates.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_REDIRECT
tristate "REDIRECT target support"
depends on NF_NAT
select NF_NAT_REDIRECT
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 NETFILTER_XT_TARGET_MASQUERADE
tristate "MASQUERADE target support"
depends on NF_NAT
default m if NETFILTER_ADVANCED=n
select NF_NAT_MASQUERADE
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 NETFILTER_XT_TARGET_TEE
tristate '"TEE" - packet cloning to alternate destination'
depends on NETFILTER_ADVANCED
depends on IPV6 || IPV6=n
depends on !NF_CONNTRACK || NF_CONNTRACK
depends on IP6_NF_IPTABLES || !IP6_NF_IPTABLES
select NF_DUP_IPV4
select NF_DUP_IPV6 if IP6_NF_IPTABLES
help
This option adds a "TEE" target with which a packet can be cloned and
this clone be rerouted to another nexthop.
config NETFILTER_XT_TARGET_TPROXY
tristate '"TPROXY" target transparent proxying support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
depends on IPV6 || IPV6=n
depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
depends on IP_NF_MANGLE
select NF_DEFRAG_IPV4
select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES != n
select NF_TPROXY_IPV4
select NF_TPROXY_IPV6 if IP6_NF_IPTABLES
help
This option adds a `TPROXY' target, which is somewhat similar to
REDIRECT. It can only be used in the mangle table and is useful
to redirect traffic to a transparent proxy. It does _not_ depend
on Netfilter connection tracking and NAT, unlike REDIRECT.
For it to work you will have to configure certain iptables rules
and use policy routing. For more information on how to set it up
see Documentation/networking/tproxy.rst.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_TRACE
tristate '"TRACE" target support'
depends on IP_NF_RAW || IP6_NF_RAW
depends on NETFILTER_ADVANCED
help
The TRACE target allows you to mark packets so that the kernel
will log every rule which match the packets as those traverse
the tables, chains, rules.
If you want to compile it as a module, say M here and read
. If unsure, say `N'.
config NETFILTER_XT_TARGET_SECMARK
tristate '"SECMARK" target support'
depends on NETWORK_SECMARK
default m if NETFILTER_ADVANCED=n
help
The SECMARK target allows security marking of network
packets, for use with security subsystems.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_TCPMSS
tristate '"TCPMSS" target support'
depends on IPV6 || IPV6=n
default m if NETFILTER_ADVANCED=n
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.
config NETFILTER_XT_TARGET_TCPOPTSTRIP
tristate '"TCPOPTSTRIP" target support'
depends on IP_NF_MANGLE || IP6_NF_MANGLE
depends on NETFILTER_ADVANCED
help
This option adds a "TCPOPTSTRIP" target, which allows you to strip
TCP options from TCP packets.
# alphabetically ordered list of matches
comment "Xtables matches"
config NETFILTER_XT_MATCH_ADDRTYPE
tristate '"addrtype" address type match support'
default m if NETFILTER_ADVANCED=n
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
. If unsure, say `N'.
config NETFILTER_XT_MATCH_BPF
tristate '"bpf" match support'
depends on NETFILTER_ADVANCED
help
BPF matching applies a linux socket filter to each packet and
accepts those for which the filter returns non-zero.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_CGROUP
tristate '"control group" match support'
depends on NETFILTER_ADVANCED
depends on CGROUPS
select CGROUP_NET_CLASSID
help
Socket/process control group matching allows you to match locally
generated packets based on which net_cls control group processes
belong to.
config NETFILTER_XT_MATCH_CLUSTER
tristate '"cluster" match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
help
This option allows you to build work-load-sharing clusters of
network servers/stateful firewalls without having a dedicated
load-balancing router/server/switch. Basically, this match returns
true when the packet must be handled by this cluster node. Thus,
all nodes see all packets and this match decides which node handles
what packets. The work-load sharing algorithm is based on source
address hashing.
If you say Y or M here, try `iptables -m cluster --help` for
more information.
config NETFILTER_XT_MATCH_COMMENT
tristate '"comment" match support'
depends on NETFILTER_ADVANCED
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
. If unsure, say `N'.
config NETFILTER_XT_MATCH_CONNBYTES
tristate '"connbytes" per-connection counter match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
help
This option adds a `connbytes' match, which allows you to match the
number of bytes and/or packets for each direction within a connection.
If you want to compile it as a module, say M here and read
. If unsure, say `N'.
config NETFILTER_XT_MATCH_CONNLABEL
tristate '"connlabel" match support'
select NF_CONNTRACK_LABELS
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
help
This match allows you to test and assign userspace-defined labels names
to a connection. The kernel only stores bit values - mapping
names to bits is done by userspace.
Unlike connmark, more than 32 flag bits may be assigned to a
connection simultaneously.
config NETFILTER_XT_MATCH_CONNLIMIT
tristate '"connlimit" match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NETFILTER_CONNCOUNT
help
This match allows you to match against the number of parallel
connections to a server per client IP address (or address block).
config NETFILTER_XT_MATCH_CONNMARK
tristate '"connmark" connection mark match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
select NETFILTER_XT_CONNMARK
help
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects
CONFIG_NETFILTER_XT_CONNMARK (combined connmark/CONNMARK module).
config NETFILTER_XT_MATCH_CONNTRACK
tristate '"conntrack" connection tracking match support'
depends on NF_CONNTRACK
default m if NETFILTER_ADVANCED=n
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 NETFILTER_XT_MATCH_CPU
tristate '"cpu" match support'
depends on NETFILTER_ADVANCED
help
CPU matching allows you to match packets based on the CPU
currently handling the packet.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_DCCP
tristate '"dccp" protocol match support'
depends on NETFILTER_ADVANCED
default IP_DCCP
help
With this option enabled, you will be able to use the iptables
`dccp' match in order to match on DCCP source/destination ports
and DCCP flags.
If you want to compile it as a module, say M here and read
. If unsure, say `N'.
config NETFILTER_XT_MATCH_DEVGROUP
tristate '"devgroup" match support'
depends on NETFILTER_ADVANCED
help
This options adds a `devgroup' match, which allows to match on the
device group a network device is assigned to.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_DSCP
tristate '"dscp" and "tos" match support'
depends on NETFILTER_ADVANCED
help
This option adds a `DSCP' match, which allows you to match against
the IPv4/IPv6 header DSCP field (differentiated services codepoint).
The DSCP field can have any value between 0x0 and 0x3f inclusive.
It will also add a "tos" match, which allows you to match packets
based on the Type Of Service fields of the IPv4 packet (which share
the same bits as DSCP).
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_ECN
tristate '"ecn" match support'
depends on NETFILTER_ADVANCED
help
This option adds an "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 NETFILTER_XT_MATCH_ESP
tristate '"esp" match support'
depends on NETFILTER_ADVANCED
help
This match extension allows you to match a range of SPIs
inside ESP header of IPSec packets.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_HASHLIMIT
tristate '"hashlimit" match support'
depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
depends on NETFILTER_ADVANCED
help
This option adds a `hashlimit' match.
As opposed to `limit', this match dynamically creates a hash table
of limit buckets, based on your selection of source/destination
addresses and/or ports.
It enables you to express policies like `10kpps for any given
destination address' or `500pps from any given source address'
with a single rule.
config NETFILTER_XT_MATCH_HELPER
tristate '"helper" match support'
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
help
Helper matching allows you to match packets in dynamic connections
tracked by a conntrack-helper, ie. nf_conntrack_ftp
To compile it as a module, choose M here. If unsure, say Y.
config NETFILTER_XT_MATCH_HL
tristate '"hl" hoplimit/TTL match support'
depends on NETFILTER_ADVANCED
help
HL matching allows you to match packets based on the hoplimit
in the IPv6 header, or the time-to-live field in the IPv4
header of the packet.
config NETFILTER_XT_MATCH_IPCOMP
tristate '"ipcomp" match support'
depends on NETFILTER_ADVANCED
help
This match extension allows you to match a range of CPIs(16 bits)
inside IPComp header of IPSec packets.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_IPRANGE
tristate '"iprange" address range match support'
depends on NETFILTER_ADVANCED
help
This option adds a "iprange" match, which allows you to match based on
an IP address range. (Normal iptables only matches on single addresses
with an optional mask.)
If unsure, say M.
config NETFILTER_XT_MATCH_IPVS
tristate '"ipvs" match support'
depends on IP_VS
depends on NETFILTER_ADVANCED
depends on NF_CONNTRACK
help
This option allows you to match against IPVS properties of a packet.
If unsure, say N.
config NETFILTER_XT_MATCH_L2TP
tristate '"l2tp" match support'
depends on NETFILTER_ADVANCED
default L2TP
help
This option adds an "L2TP" match, which allows you to match against
L2TP protocol header fields.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_LENGTH
tristate '"length" match support'
depends on NETFILTER_ADVANCED
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 NETFILTER_XT_MATCH_LIMIT
tristate '"limit" match support'
depends on NETFILTER_ADVANCED
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 NETFILTER_XT_MATCH_MAC
tristate '"mac" address match support'
depends on NETFILTER_ADVANCED
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 NETFILTER_XT_MATCH_MARK
tristate '"mark" match support'
depends on NETFILTER_ADVANCED
select NETFILTER_XT_MARK
help
This is a backwards-compat option for the user's convenience
(e.g. when running oldconfig). It selects
CONFIG_NETFILTER_XT_MARK (combined mark/MARK module).
config NETFILTER_XT_MATCH_MULTIPORT
tristate '"multiport" Multiple port match support'
depends on NETFILTER_ADVANCED
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 NETFILTER_XT_MATCH_NFACCT
tristate '"nfacct" match support'
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK_ACCT
help
This option allows you to use the extended accounting through
nfnetlink_acct.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_OSF
tristate '"osf" Passive OS fingerprint match'
depends on NETFILTER_ADVANCED
select NETFILTER_NETLINK_OSF
help
This option selects the Passive OS Fingerprinting match module
that allows to passively match the remote operating system by
analyzing incoming TCP SYN packets.
Rules and loading software can be downloaded from
http://www.ioremap.net/projects/osf
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_OWNER
tristate '"owner" match support'
depends on NETFILTER_ADVANCED
help
Socket owner matching allows you to match locally-generated packets
based on who created the socket: the user or group. It is also
possible to check whether a socket actually exists.
config NETFILTER_XT_MATCH_POLICY
tristate 'IPsec "policy" match support'
depends on XFRM
default m if NETFILTER_ADVANCED=n
help
Policy matching allows you to match packets based on the
IPsec policy that was used during decapsulation/will
be used during encapsulation.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_PHYSDEV
tristate '"physdev" match support'
depends on BRIDGE && BRIDGE_NETFILTER
depends on NETFILTER_ADVANCED
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 NETFILTER_XT_MATCH_PKTTYPE
tristate '"pkttype" packet type match support'
depends on NETFILTER_ADVANCED
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 NETFILTER_XT_MATCH_QUOTA
tristate '"quota" match support'
depends on NETFILTER_ADVANCED
help
This option adds a `quota' match, which allows to match on a
byte counter.
If you want to compile it as a module, say M here and read
. If unsure, say `N'.
config NETFILTER_XT_MATCH_RATEEST
tristate '"rateest" match support'
depends on NETFILTER_ADVANCED
select NETFILTER_XT_TARGET_RATEEST
help
This option adds a `rateest' match, which allows to match on the
rate estimated by the RATEEST target.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_REALM
tristate '"realm" match support'
depends on NETFILTER_ADVANCED
select IP_ROUTE_CLASSID
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
. If unsure, say `N'.
config NETFILTER_XT_MATCH_RECENT
tristate '"recent" match support'
depends on NETFILTER_ADVANCED
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:
config NETFILTER_XT_MATCH_SCTP
tristate '"sctp" protocol match support'
depends on NETFILTER_ADVANCED
default IP_SCTP
help
With this option enabled, you will be able to use the
`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
. If unsure, say `N'.
config NETFILTER_XT_MATCH_SOCKET
tristate '"socket" match support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
depends on IPV6 || IPV6=n
depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
select NF_SOCKET_IPV4
select NF_SOCKET_IPV6 if IP6_NF_IPTABLES
select NF_DEFRAG_IPV4
select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES != n
help
This option adds a `socket' match, which can be used to match
packets for which a TCP or UDP socket lookup finds a valid socket.
It can be used in combination with the MARK target and policy
routing to implement full featured non-locally bound sockets.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_STATE
tristate '"state" match support'
depends on NF_CONNTRACK
default m if NETFILTER_ADVANCED=n
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 NETFILTER_XT_MATCH_STATISTIC
tristate '"statistic" match support'
depends on NETFILTER_ADVANCED
help
This option adds a `statistic' match, which allows you to match
on packets periodically or randomly with a given percentage.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_STRING
tristate '"string" match support'
depends on NETFILTER_ADVANCED
select TEXTSEARCH
select TEXTSEARCH_KMP
select TEXTSEARCH_BM
select TEXTSEARCH_FSM
help
This option adds a `string' match, which allows you to look for
pattern matchings in packets.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_TCPMSS
tristate '"tcpmss" match support'
depends on NETFILTER_ADVANCED
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 NETFILTER_XT_MATCH_TIME
tristate '"time" match support'
depends on NETFILTER_ADVANCED
help
This option adds a "time" match, which allows you to match based on
the packet arrival time (at the machine which netfilter is running)
on) or departure time/date (for locally generated packets).
If you say Y here, try `iptables -m time --help` for
more information.
If you want to compile it as a module, say M here.
If unsure, say N.
config NETFILTER_XT_MATCH_U32
tristate '"u32" match support'
depends on NETFILTER_ADVANCED
help
u32 allows you to extract quantities of up to 4 bytes from a packet,
AND them with specified masks, shift them by specified amounts and
test whether the results are in any of a set of specified ranges.
The specification of what to extract is general enough to skip over
headers with lengths stored in the packet, as in IP or TCP header
lengths.
Details and examples are in the kernel module source.
endif # NETFILTER_XTABLES
endmenu
source "net/netfilter/ipset/Kconfig"
source "net/netfilter/ipvs/Kconfig"