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* net: mpls: Fix nexthop alive tracking on down eventsDavid Ahern2017-03-161-3/+10
| | | | | | | | | | | | | | | | | | | | | Alive tracking of nexthops can account for a link twice if the carrier goes down followed by an admin down of the same link rendering multipath routes useless. This is similar to 79099aab38c8 for UNREGISTER events and DOWN events. Fix by tracking number of alive nexthops in mpls_ifdown similar to the logic in mpls_ifup. Checking the flags per nexthop once after all events have been processed is simpler than trying to maintian a running count through all event combinations. Also, WRITE_ONCE is used instead of ACCESS_ONCE to set rt_nhn_alive per a comment from checkpatch: WARNING: Prefer WRITE_ONCE(<FOO>, <BAR>) over ACCESS_ONCE(<FOO>) = <BAR> Fixes: c89359a42e2a4 ("mpls: support for dead routes") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: Do not decrement alive counter for unregister eventsDavid Ahern2017-03-121-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Multipath routes can be rendered usesless when a device in one of the paths is deleted. For example: $ ip -f mpls ro ls 100 nexthop as to 200 via inet 172.16.2.2 dev virt12 nexthop as to 300 via inet 172.16.3.2 dev br0 101 nexthop as to 201 via inet6 2000:2::2 dev virt12 nexthop as to 301 via inet6 2000:3::2 dev br0 $ ip li del br0 When br0 is deleted the other hop is not considered in mpls_select_multipath because of the alive check -- rt_nhn_alive is 0. rt_nhn_alive is decremented once in mpls_ifdown when the device is taken down (NETDEV_DOWN) and again when it is deleted (NETDEV_UNREGISTER). For a 2 hop route, deleting one device drops the alive count to 0. Since devices are taken down before unregistering, the decrement on NETDEV_UNREGISTER is redundant. Fixes: c89359a42e2a4 ("mpls: support for dead routes") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: Send route delete notifications when router module is unloadedDavid Ahern2017-03-121-0/+1
| | | | | | | | | | | When the mpls_router module is unloaded, mpls routes are deleted but notifications are not sent to userspace leaving userspace caches out of sync. Add the call to mpls_notify_route in mpls_net_exit as routes are freed. Fixes: 0189197f44160 ("mpls: Basic routing support") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: mpls: Add support for netconfDavid Ahern2017-02-202-3/+211
| | | | | | | | | | Add netconf support to MPLS. Allows userpsace to learn and be notified of changes to 'input' enable setting per interface. Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: remove device arg to lwtunnel_build_stateDavid Ahern2017-01-301-1/+1
| | | | | | | | Nothing about lwt state requires a device reference, so remove the input argument. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2017-01-282-23/+26
|\ | | | | | | | | | | Two trivial overlapping changes conflicts in MPLS and mlx5. Signed-off-by: David S. Miller <davem@davemloft.net>
| * net: Specify the owning module for lwtunnel opsRobert Shearman2017-01-241-0/+1
| | | | | | | | | | | | | | | | | | Modules implementing lwtunnel ops should not be allowed to unload while there is state alive using those ops, so specify the owning module for all lwtunnel ops. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * net: mpls: Fix multipath selection for LSR use caseDavid Ahern2017-01-231-23/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | MPLS multipath for LSR is broken -- always selecting the first nexthop in the one label case. For example: $ ip -f mpls ro ls 100 nexthop as to 200 via inet 172.16.2.2 dev virt12 nexthop as to 300 via inet 172.16.3.2 dev virt13 101 nexthop as to 201 via inet6 2000:2::2 dev virt12 nexthop as to 301 via inet6 2000:3::2 dev virt13 In this example incoming packets have a single MPLS labels which means BOS bit is set. The BOS bit is passed from mpls_forward down to mpls_multipath_hash which never processes the hash loop because BOS is 1. Update mpls_multipath_hash to process the entire label stack. mpls_hdr_len tracks the total mpls header length on each pass (on pass N mpls_hdr_len is N * sizeof(mpls_shim_hdr)). When the label is found with the BOS set it verifies the skb has sufficient header for ipv4 or ipv6, and find the IPv4 and IPv6 header by using the last mpls_hdr pointer and adding 1 to advance past it. With these changes I have verified the code correctly sees the label, BOS, IPv4 and IPv6 addresses in the network header and icmp/tcp/udp traffic for ipv4 and ipv6 are distributed across the nexthops. Fixes: 1c78efa8319ca ("mpls: flow-based multipath selection") Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | mpls: Packet statsRobert Shearman2017-01-173-28/+222
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | Having MPLS packet stats is useful for observing network operation and for diagnosing network problems. In the absence of anything better, RFC2863 and RFC3813 are used for guidance for which stats to expose and the semantics of them. In particular rx_noroutes maps to in unknown protos in RFC2863. The stats are exposed to userspace via AF_MPLS attributes embedded in the IFLA_STATS_AF_SPEC attribute of RTM_GETSTATS messages. All the introduced fields are 64-bit, even error ones, to ensure no overflow with long uptimes. Per-CPU counters are used to avoid cache-line contention on the commonly used fields. The other fields have also been made per-CPU for code to avoid performance problems in error conditions on the assumption that on some platforms the cost of atomic operations could be more expensive than sending the packet (which is what would be done in the success case). If that's not the case, we could instead not use per-CPU counters for these fields. Only unicast and non-fragment are exposed at the moment, but other counters can be exposed in the future either by adding to the end of struct mpls_link_stats or by additional netlink attributes in the AF_MPLS IFLA_STATS_AF_SPEC nested attribute. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2016-12-061-1/+1
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| * net: af_mpls.c add space before open parenthesisSuraj Deshmukh2016-12-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | Adding space after switch keyword before open parenthesis for readability purpose. This patch fixes the checkpatch.pl warning: space required before the open parenthesis '(' Signed-off-by: Suraj Deshmukh <surajssd009005@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | lwt: Remove unused len fieldThomas Graf2016-10-231-4/+1
|/ | | | | | | The field is initialized by ILA and MPLS but never used. Remove it. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: move mpls_hdr to a common locationJiri Benc2016-10-031-9/+1
| | | | | | | | | This will be also used by openvswitch. Signed-off-by: Jiri Benc <jbenc@redhat.com> Acked-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: get rid of trivial returnsstephen hemminger2016-09-011-5/+0
| | | | | | | return at end of function is useless. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: mpls: Fixups for GSODavid Ahern2016-08-302-11/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As reported by Lennert the MPLS GSO code is failing to properly segment large packets. There are a couple of problems: 1. the inner protocol is not set so the gso segment functions for inner protocol layers are not getting run, and 2 MPLS labels for packets that use the "native" (non-OVS) MPLS code are not properly accounted for in mpls_gso_segment. The MPLS GSO code was added for OVS. It is re-using skb_mac_gso_segment to call the gso segment functions for the higher layer protocols. That means skb_mac_gso_segment is called twice -- once with the network protocol set to MPLS and again with the network protocol set to the inner protocol. This patch sets the inner skb protocol addressing item 1 above and sets the network_header and inner_network_header to mark where the MPLS labels start and end. The MPLS code in OVS is also updated to set the two network markers. >From there the MPLS GSO code uses the difference between the network header and the inner network header to know the size of the MPLS header that was pushed. It then pulls the MPLS header, resets the mac_len and protocol for the inner protocol and then calls skb_mac_gso_segment to segment the skb. Afterward the inner protocol segmentation is done the skb protocol is set to mpls for each segment and the network and mac headers restored. Reported-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: lwtunnel: Handle fragmentationRoopa Prabhu2016-08-301-4/+5
| | | | | | | | | | | | | | | | | | | | | | | | Today mpls iptunnel lwtunnel_output redirect expects the tunnel output function to handle fragmentation. This is ok but can be avoided if we did not do the mpls output redirect too early. ie we could wait until ip fragmentation is done and then call mpls output for each ip fragment. To make this work we will need, 1) the lwtunnel state to carry encap headroom 2) and do the redirect to the encap output handler on the ip fragment (essentially do the output redirect after fragmentation) This patch adds tunnel headroom in lwtstate to make sure we account for tunnel data in mtu calculations during fragmentation and adds new xmit redirect handler to redirect to lwtunnel xmit func after ip fragmentation. This includes IPV6 and some mtu fixes and testing from David Ahern. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: allow routes on ipip and sit devicesSimon Horman2016-07-091-2/+4
| | | | | | | | | Allow MPLS routes on IPIP and SIT devices now that they support forwarding MPLS packets. Signed-off-by: Simon Horman <simon.horman@netronome.com> Reviewed-by: Dinan Gunawardena <dinan.gunawardena@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: allow routes on ipgre devicesSimon Horman2016-06-161-3/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This appears to be necessary and sufficient to provide MPLS in GRE (RFC4023) support. This can be used by establishing an ipgre tunnel device and then routing MPLS over it. The following example will forward MPLS frames received with an outermost MPLS label 100 over tun1, a GRE tunnel. The forwarded packet will have the outermost MPLS LSE removed and two new LSEs added with labels 200 (outermost) and 300 (next). ip link add name tun1 type gre remote 10.0.99.193 local 10.0.99.192 ttl 225 ip link set up dev tun1 ip addr add 10.0.98.192/24 dev tun1 ip route sh echo 1 > /proc/sys/net/mpls/conf/eth0/input echo 101 > /proc/sys/net/mpls/platform_labels ip -f mpls route add 100 as 200/300 via inet 10.0.98.193 ip -f mpls route sh Also remove unnecessary braces. Reviewed-by: Dinan Gunawardena <dinan.gunawardena@netronome.com> Signed-off-by: Simon Horman <simon.horman@netronome.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* skbuff: introduce skb_gso_validate_mtuMarcelo Ricardo Leitner2016-06-031-1/+1
| | | | | | | | | | | | | skb_gso_network_seglen is not enough for checking fragment sizes if skb is using GSO_BY_FRAGS as we have to check frag per frag. This patch introduces skb_gso_validate_mtu, based on the former, which will wrap the use case inside it as all calls to skb_gso_network_seglen were to validate if it fits on a given TMU, and improve the check. Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Tested-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* gso: Remove arbitrary checks for unsupported GSOTom Herbert2016-05-201-10/+1
| | | | | | | | | | | | | | In several gso_segment functions there are checks of gso_type against a seemingly arbitrary list of SKB_GSO_* flags. This seems like an attempt to identify unsupported GSO types, but since the stack is the one that set these GSO types in the first place this seems unnecessary to do. If a combination isn't valid in the first place that stack should not allow setting it. This is a code simplication especially for add new GSO types. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* GSO: Add GSO type for fixed IPv4 IDAlexander Duyck2016-04-141-0/+1
| | | | | | | | | | | | | | | | | This patch adds support for TSO using IPv4 headers with a fixed IP ID field. This is meant to allow us to do a lossless GRO in the case of TCP flows that use a fixed IP ID such as those that convert IPv6 header to IPv4 headers. In addition I am adding a feature that for now I am referring to TSO with IP ID mangling. Basically when this flag is enabled the device has the option to either output the flow with incrementing IP IDs or with a fixed IP ID regardless of what the original IP ID ordering was. This is useful in cases where the DF bit is set and we do not care if the original IP ID value is maintained. Signed-off-by: Alexander Duyck <aduyck@mirantis.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: find_outdev: check for err ptr in addition to NULL checkRoopa Prabhu2016-04-081-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | find_outdev calls inet{,6}_fib_lookup_dev() or dev_get_by_index() to find the output device. In case of an error, inet{,6}_fib_lookup_dev() returns error pointer and dev_get_by_index() returns NULL. But the function only checks for NULL and thus can end up calling dev_put on an ERR_PTR. This patch adds an additional check for err ptr after the NULL check. Before: Trying to add an mpls route with no oif from user, no available path to 10.1.1.8 and no default route: $ip -f mpls route add 100 as 200 via inet 10.1.1.8 [ 822.337195] BUG: unable to handle kernel NULL pointer dereference at 00000000000003a3 [ 822.340033] IP: [<ffffffff8148781e>] mpls_nh_assign_dev+0x10b/0x182 [ 822.340033] PGD 1db38067 PUD 1de9e067 PMD 0 [ 822.340033] Oops: 0000 [#1] SMP [ 822.340033] Modules linked in: [ 822.340033] CPU: 0 PID: 11148 Comm: ip Not tainted 4.5.0-rc7+ #54 [ 822.340033] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org 04/01/2014 [ 822.340033] task: ffff88001db82580 ti: ffff88001dad4000 task.ti: ffff88001dad4000 [ 822.340033] RIP: 0010:[<ffffffff8148781e>] [<ffffffff8148781e>] mpls_nh_assign_dev+0x10b/0x182 [ 822.340033] RSP: 0018:ffff88001dad7a88 EFLAGS: 00010282 [ 822.340033] RAX: ffffffffffffff9b RBX: ffffffffffffff9b RCX: 0000000000000002 [ 822.340033] RDX: 00000000ffffff9b RSI: 0000000000000008 RDI: 0000000000000000 [ 822.340033] RBP: ffff88001ddc9ea0 R08: ffff88001e9f1768 R09: 0000000000000000 [ 822.340033] R10: ffff88001d9c1100 R11: ffff88001e3c89f0 R12: ffffffff8187e0c0 [ 822.340033] R13: ffffffff8187e0c0 R14: ffff88001ddc9e80 R15: 0000000000000004 [ 822.340033] FS: 00007ff9ed798700(0000) GS:ffff88001fc00000(0000) knlGS:0000000000000000 [ 822.340033] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 822.340033] CR2: 00000000000003a3 CR3: 000000001de89000 CR4: 00000000000006f0 [ 822.340033] Stack: [ 822.340033] 0000000000000000 0000000100000000 0000000000000000 0000000000000000 [ 822.340033] 0000000000000000 0801010a00000000 0000000000000000 0000000000000000 [ 822.340033] 0000000000000004 ffffffff8148749b ffffffff8187e0c0 000000000000001c [ 822.340033] Call Trace: [ 822.340033] [<ffffffff8148749b>] ? mpls_rt_alloc+0x2b/0x3e [ 822.340033] [<ffffffff81488e66>] ? mpls_rtm_newroute+0x358/0x3e2 [ 822.340033] [<ffffffff810e7bbc>] ? get_page+0x5/0xa [ 822.340033] [<ffffffff813b7d94>] ? rtnetlink_rcv_msg+0x17e/0x191 [ 822.340033] [<ffffffff8111794e>] ? __kmalloc_track_caller+0x8c/0x9e [ 822.340033] [<ffffffff813c9393>] ? rht_key_hashfn.isra.20.constprop.57+0x14/0x1f [ 822.340033] [<ffffffff813b7c16>] ? __rtnl_unlock+0xc/0xc [ 822.340033] [<ffffffff813cb794>] ? netlink_rcv_skb+0x36/0x82 [ 822.340033] [<ffffffff813b4507>] ? rtnetlink_rcv+0x1f/0x28 [ 822.340033] [<ffffffff813cb2b1>] ? netlink_unicast+0x106/0x189 [ 822.340033] [<ffffffff813cb5b3>] ? netlink_sendmsg+0x27f/0x2c8 [ 822.340033] [<ffffffff81392ede>] ? sock_sendmsg_nosec+0x10/0x1b [ 822.340033] [<ffffffff81393df1>] ? ___sys_sendmsg+0x182/0x1e3 [ 822.340033] [<ffffffff810e4f35>] ? __alloc_pages_nodemask+0x11c/0x1e4 [ 822.340033] [<ffffffff8110619c>] ? PageAnon+0x5/0xd [ 822.340033] [<ffffffff811062fe>] ? __page_set_anon_rmap+0x45/0x52 [ 822.340033] [<ffffffff810e7bbc>] ? get_page+0x5/0xa [ 822.340033] [<ffffffff810e85ab>] ? __lru_cache_add+0x1a/0x3a [ 822.340033] [<ffffffff81087ea9>] ? current_kernel_time64+0x9/0x30 [ 822.340033] [<ffffffff813940c4>] ? __sys_sendmsg+0x3c/0x5a [ 822.340033] [<ffffffff8148f597>] ? entry_SYSCALL_64_fastpath+0x12/0x6a [ 822.340033] Code: 83 08 04 00 00 65 ff 00 48 8b 3c 24 e8 40 7c f2 ff eb 13 48 c7 c3 9f ff ff ff eb 0f 89 ce e8 f1 ae f1 ff 48 89 c3 48 85 db 74 15 <48> 8b 83 08 04 00 00 65 ff 08 48 81 fb 00 f0 ff ff 76 0d eb 07 [ 822.340033] RIP [<ffffffff8148781e>] mpls_nh_assign_dev+0x10b/0x182 [ 822.340033] RSP <ffff88001dad7a88> [ 822.340033] CR2: 00000000000003a3 [ 822.435363] ---[ end trace 98cc65e6f6b8bf11 ]--- After patch: $ip -f mpls route add 100 as 200 via inet 10.1.1.8 RTNETLINK answers: Network is unreachable Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Reported-by: David Miller <davem@davemloft.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: autoload lwt moduleRobert Shearman2016-02-211-0/+1
| | | | | | | | Avoid users having to manually load the module by adding a module alias allowing it to be autoloaded by the lwt infra. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-12-172-14/+33
|\ | | | | | | | | | | | | | | | | | | | | Conflicts: drivers/net/geneve.c Here we had an overlapping change, where in 'net' the extraneous stats bump was being removed whilst in 'net-next' the final argument to udp_tunnel6_xmit_skb() was being changed. Signed-off-by: David S. Miller <davem@davemloft.net>
| * mpls: make via address optional for multipath routesRobert Shearman2015-12-121-9/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The via address is optional for a single path route, yet is mandatory when the multipath attribute is used: # ip -f mpls route add 100 dev lo # ip -f mpls route add 101 nexthop dev lo RTNETLINK answers: Invalid argument Make them consistent by making the via address optional when the RTA_MULTIPATH attribute is being parsed so that both forms of specifying the route work. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * mpls: fix out-of-bounds access when via address not specifiedRobert Shearman2015-12-121-5/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a via address isn't specified, the via table is left initialised to 0 (NEIGH_ARP_TABLE), and the via address length also left initialised to 0. This results in a via address array of length 0 being allocated (contiguous with route and nexthop array), meaning that when a packet is sent using neigh_xmit the neighbour lookup and creation will cause an out-of-bounds access when accessing the 4 bytes of the IPv4 address it assumes it has been given a pointer to. This could be fixed by allocating the 4 bytes of via address necessary and leaving it as all zeroes. However, it seems wrong to me to use an ipv4 nexthop (including possibly ARPing for 0.0.0.0) when the user didn't specify to do so. Instead, set the via address table to NEIGH_NR_TABLES to signify it hasn't been specified and use this at forwarding time to signify a neigh_xmit using an L2 address consisting of the device address. This mechanism is the same as that used for both ARP and ND for loopback interfaces and those flagged as no-arp, which are all we can really support in this case. Fixes: cf4b24f0024f ("mpls: reduce memory usage of routes") Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * mpls: don't dump RTA_VIA attribute if not specifiedRobert Shearman2015-12-121-2/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The problem seen is that when adding a route with a nexthop with no via address specified, iproute2 generates bogus output: # ip -f mpls route add 100 dev lo # ip -f mpls route list 100 via inet 0.0.8.0 dev lo The reason for this is that the kernel generates an RTA_VIA attribute with the family set to AF_INET, but the via address data having zero length. The cause of family being AF_INET is that on route insert cfg->rc_via_table is left set to 0, which just happens to be NEIGH_ARP_TABLE which is then translated into AF_INET. iproute2 doesn't validate the length prior to printing and so prints garbage. Although it could be fixed to do the validation, I would argue that AF_INET addresses should always be exactly 4 bytes so the kernel is really giving userspace bogus data. Therefore, avoid generating the RTA_VIA attribute when dumping the route if the via address wasn't specified on add/modify. This is indicated by NEIGH_ARP_TABLE and a zero via address length - if the user specified a via address the address length would have been validated such that it was 4 bytes. Although this is a change in behaviour that is visible to userspace, I believe that what was generated before was invalid and as such userspace wouldn't be expecting it. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * mpls: validate L2 via address lengthRobert Shearman2015-12-121-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If an L2 via address for an mpls nexthop is specified, the length of the L2 address must match that expected by the output device, otherwise it could access memory beyond the end of the via address buffer in the route. This check was present prior to commit f8efb73c97e2 ("mpls: multipath route support"), but got lost in the refactoring, so add it back, applying it to all nexthops in multipath routes. Fixes: f8efb73c97e2 ("mpls: multipath route support") Signed-off-by: Robert Shearman <rshearma@brocade.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * mpls: fix sending of local encapped packetsRobert Shearman2015-12-071-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Locally generated IPv4 and (probably) IPv6 packets are dropped because skb->protocol isn't set. We could write wrappers to lwtunnel_output for IPv4 and IPv6 that set the protocol accordingly and then call lwtunnel_output, but mpls_output relies on the AF-specific type of dst anyway to get the via address. Therefore, make use of dst->dst_ops->family in mpls_output to determine the type of nexthop and thus protocol of the packet instead of checking skb->protocol. Fixes: 61adedf3e3f1 ("route: move lwtunnel state to dst_entry") Reported-by: Sam Russell <sam.h.russell@gmail.com> Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | mpls_iptunnel: add static qualifier to mpls_outputRoopa Prabhu2015-12-111-1/+1
| | | | | | | | | | | | | | | | | | | | This gets rid of the following compile warn: net/mpls/mpls_iptunnel.c:40:5: warning: no previous prototype for mpls_output [-Wmissing-prototypes] Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | mpls: support for dead routesRoopa Prabhu2015-12-032-28/+159
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Adds support for RTNH_F_DEAD and RTNH_F_LINKDOWN flags on mpls routes due to link events. Also adds code to ignore dead routes during route selection. Unlike ip routes, mpls routes are not deleted when the route goes dead. This is current mpls behaviour and this patch does not change that. With this patch however, routes will be marked dead. dead routes are not notified to userspace (this is consistent with ipv4 routes). dead routes: ----------- $ip -f mpls route show 100 nexthop as to 200 via inet 10.1.1.2 dev swp1 nexthop as to 700 via inet 10.1.1.6 dev swp2 $ip link set dev swp1 down $ip link show dev swp1 4: swp1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether 00:02:00:00:00:01 brd ff:ff:ff:ff:ff:ff $ip -f mpls route show 100 nexthop as to 200 via inet 10.1.1.2 dev swp1 dead linkdown nexthop as to 700 via inet 10.1.1.6 dev swp2 linkdown routes: ---------------- $ip -f mpls route show 100 nexthop as to 200 via inet 10.1.1.2 dev swp1 nexthop as to 700 via inet 10.1.1.6 dev swp2 $ip link show dev swp1 4: swp1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 00:02:00:00:00:01 brd ff:ff:ff:ff:ff:ff /* carrier goes down */ $ip link show dev swp1 4: swp1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether 00:02:00:00:00:01 brd ff:ff:ff:ff:ff:ff $ip -f mpls route show 100 nexthop as to 200 via inet 10.1.1.2 dev swp1 linkdown nexthop as to 700 via inet 10.1.1.6 dev swp2 Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: reduce memory usage of routesRobert Shearman2015-10-272-38/+111
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Nexthops for MPLS routes have a via address field sized for the largest via address that is expected, which is 32 bytes. This means that in the most common case of having ipv4 via addresses, 28 bytes of memory more than required are used per nexthop. In the other common case of an ipv6 nexthop then 16 bytes more than required are used. With large numbers of MPLS routes this extra memory usage could start to become significant. To avoid allocating memory for a maximum length via address when not all of it is required and to allow for ease of iterating over nexthops, then the via addresses are changed to be stored in the same memory block as the route and nexthops, but in an array after the end of the array of nexthops. New accessors are provided to retrieve a pointer to the via address. To allow for O(1) access without having to store a pointer or offset per nh, the via address for each nexthop is sized according to the maximum via address for any nexthop in the route, which is stored in a new route field, rt_max_alen, but this is in an existing hole in struct mpls_route so it doesn't increase the size of the structure. Each via address is ensured to be aligned to VIA_ALEN_ALIGN to account for architectures that don't allow unaligned accesses. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: fix forwarding using v4/v6 explicit nullRobert Shearman2015-10-271-0/+2
| | | | | | | | | | Fill in the via address length for the predefined IPv4 and IPv6 explicit-null label routes. Fixes: f8efb73c97e2 ("mpls: multipath route support") Signed-off-by: Robert Shearman <rshearma@brocade.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: flow-based multipath selectionRobert Shearman2015-10-231-4/+83
| | | | | | | | | | | | | | | | | | | | | | | Change the selection of a multipath route to use a flow-based hash. This more suitable for traffic sensitive to reordering within a flow (e.g. TCP, L2VPN) and whilst still allowing a good distribution of traffic given enough flows. Selection of the path for a multipath route is done using a hash of: 1. Label stack up to MAX_MP_SELECT_LABELS labels or up to and including entropy label, whichever is first. 2. 3-tuple of (L3 src, L3 dst, proto) from IPv4/IPv6 header in MPLS payload, if present. Naturally, a 5-tuple hash using L4 information in addition would be possible and be better in some scenarios, but there is a tradeoff between looking deeper into the packet to achieve good distribution, and packet forwarding performance, and I have erred on the side of the latter as the default. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: multipath route supportRoopa Prabhu2015-10-232-148/+400
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support for MPLS multipath routes. Includes following changes to support multipath: - splits struct mpls_route into 'struct mpls_route + struct mpls_nh' - 'struct mpls_nh' represents a mpls nexthop label forwarding entry - moves mpls route and nexthop structures into internal.h - A mpls_route can point to multiple mpls_nh structs - the nexthops are maintained as a array (similar to ipv4 fib) - In the process of restructuring, this patch also consistently changes all labels to u8 - Adds support to parse/fill RTA_MULTIPATH netlink attribute for multipath routes similar to ipv4/v6 fib - In this patch, the multipath route nexthop selection algorithm simply returns the first nexthop. It is replaced by a hash based algorithm from Robert Shearman in the next patch - mpls_route_update cleanup: remove 'dev' handling in mpls_route_update. mpls_route_update though implemented to update based on dev, it was never used that way. And the dev handling gets tricky with multiple nexthops. Cannot match against any single nexthops dev. So, this patch removes the unused 'dev' handling in mpls_route_update. - dead route/path handling will be implemented in a subsequent patch Example: $ip -f mpls route add 100 nexthop as 200 via inet 10.1.1.2 dev swp1 \ nexthop as 700 via inet 10.1.1.6 dev swp2 \ nexthop as 800 via inet 40.1.1.2 dev swp3 $ip -f mpls route show 100 nexthop as to 200 via inet 10.1.1.2 dev swp1 nexthop as to 700 via inet 10.1.1.6 dev swp2 nexthop as to 800 via inet 40.1.1.2 dev swp3 Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* dst: Pass net into dst->outputEric W. Biederman2015-10-081-1/+1
| | | | | | | | The network namespace is already passed into dst_output pass it into dst->output lwt->output and friends. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: fix mpls_net_init memory leakNikolay Aleksandrov2015-08-311-1/+3
| | | | | | | | | Fix a memory leak in the mpls netns init function in case of failure. If register_net_sysctl fails then we need to free the ctl_table. Fixes: 7720c01f3f59 ("mpls: Add a sysctl to control the size of the mpls label table") Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwt: Add cfg argument to build_stateTom Herbert2015-08-241-0/+1
| | | | | | | | | | | | | Add cfg and family arguments to lwt build state functions. cfg is a void pointer and will either be a pointer to a fib_config or fib6_config structure. The family parameter indicates which one (either AF_INET or AF_INET6). LWT encpasulation implementation may use the fib configuration to build the LWT state. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* route: move lwtunnel state to dst_entryJiri Benc2015-08-201-5/+2
| | | | | | | | | | | | | | | Currently, the lwtunnel state resides in per-protocol data. This is a problem if we encapsulate ipv6 traffic in an ipv4 tunnel (or vice versa). The xmit function of the tunnel does not know whether the packet has been routed to it by ipv4 or ipv6, yet it needs the lwtstate data. Moving the lwtstate data to dst_entry makes such inter-protocol tunneling possible. As a bonus, this brings a nice diffstat. Signed-off-by: Jiri Benc <jbenc@redhat.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: Enforce payload type of traffic sent using explicit NULLRobert Shearman2015-08-091-27/+44
| | | | | | | | | | | | | | | RFC 4182 s2 states that if an IPv4 Explicit NULL label is the only label on the stack, then after popping the resulting packet must be treated as a IPv4 packet and forwarded based on the IPv4 header. The same is true for IPv6 Explicit NULL with an IPv6 packet following. Therefore, when installing the IPv4/IPv6 Explicit NULL label routes, add an attribute that specifies the expected payload type for use at forwarding time for determining the type of the encapsulated packet instead of inspecting the first nibble of the packet. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* af_mpls: add null dev check in find_outdevRoopa Prabhu2015-08-061-0/+3
| | | | | | | | | This patch adds null dev check for the 'cfg->rc_via_table == NEIGH_LINK_TABLE or dev_get_by_index() failed' case Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: small cleanup in inet/inet6_fib_lookup_dev()Dan Carpenter2015-08-061-9/+4
| | | | | | | | | | | | | | We recently changed this code from returning NULL to returning ERR_PTR. There are some left over NULL assignments which we can remove. We can preserve the error code from ip_route_output() instead of always returning -ENODEV. Also these functions use a mix of gotos and direct returns. There is no cleanup necessary so I changed the gotos to direct returns. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: Use definition for reserved label checksRobert Shearman2015-08-031-10/+11
| | | | | | | | | | | In multiple locations there are checks for whether the label in hand is a reserved label or not using the arbritray value of 16. Factor this out into a #define for better maintainability and for documentation. Signed-off-by: Robert Shearman <rshearma@brocade.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* af_mpls: fix undefined reference to ip6_route_outputRoopa Prabhu2015-07-311-8/+33
| | | | | | | | | | | | | | Undefined reference to ip6_route_output and ip_route_output was reported with CONFIG_INET=n and CONFIG_IPV6=n. This patch uses ipv6_stub_impl.ipv6_dst_lookup instead of ip6_route_output. And wraps affected code under IS_ENABLED(CONFIG_INET) and IS_ENABLED(CONFIG_IPV6). Reported-by: kbuild test robot <fengguang.wu@intel.com> Reported-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls_iptunnel: fix sparse warn: remove incorrect rcu_dereferenceRoopa Prabhu2015-07-221-1/+1
| | | | | | | | | | | | | fix for: net/mpls/mpls_iptunnel.c:73:19: sparse: incompatible types in comparison expression (different address spaces) remove incorrect rcu_dereference possibly left over from earlier revisions of the code. Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: make RTA_OIF optionalRoopa Prabhu2015-07-211-1/+66
| | | | | | | | If user did not specify an oif, try and get it from the via address. If failed to get device, return with -ENODEV. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: ip tunnel supportRoopa Prabhu2015-07-213-1/+241
| | | | | | | | | | | This implementation uses lwtunnel infrastructure to register hooks for mpls tunnel encaps. It picks cues from iptunnel_encaps infrastructure and previous mpls iptunnel RFC patches from Eric W. Biederman and Robert Shearman Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* mpls: export mpls functions for use by mpls iptunnelsRoopa Prabhu2015-07-212-5/+15
| | | | | Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-06-131-0/+11
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| * mpls: handle device renames for per-device sysctlsRobert Shearman2015-06-111-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If a device is renamed and the original name is subsequently reused for a new device, the following warning is generated: sysctl duplicate entry: /net/mpls/conf/veth0//input CPU: 3 PID: 1379 Comm: ip Not tainted 4.1.0-rc4+ #20 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014 0000000000000000 0000000000000000 ffffffff81566aaf 0000000000000000 ffffffff81236279 ffff88002f7d7f00 0000000000000000 ffff88000db336d8 ffff88000db33698 0000000000000005 ffff88002e046000 ffff8800168c9280 Call Trace: [<ffffffff81566aaf>] ? dump_stack+0x40/0x50 [<ffffffff81236279>] ? __register_sysctl_table+0x289/0x5a0 [<ffffffffa051a24f>] ? mpls_dev_notify+0x1ff/0x300 [mpls_router] [<ffffffff8108db7f>] ? notifier_call_chain+0x4f/0x70 [<ffffffff81470e72>] ? register_netdevice+0x2b2/0x480 [<ffffffffa0524748>] ? veth_newlink+0x178/0x2d3 [veth] [<ffffffff8147f84c>] ? rtnl_newlink+0x73c/0x8e0 [<ffffffff8147f27a>] ? rtnl_newlink+0x16a/0x8e0 [<ffffffff81459ff2>] ? __kmalloc_reserve.isra.30+0x32/0x90 [<ffffffff8147ccfd>] ? rtnetlink_rcv_msg+0x8d/0x250 [<ffffffff8145b027>] ? __alloc_skb+0x47/0x1f0 [<ffffffff8149badb>] ? __netlink_lookup+0xab/0xe0 [<ffffffff8147cc70>] ? rtnetlink_rcv+0x30/0x30 [<ffffffff8149e7a0>] ? netlink_rcv_skb+0xb0/0xd0 [<ffffffff8147cc64>] ? rtnetlink_rcv+0x24/0x30 [<ffffffff8149df17>] ? netlink_unicast+0x107/0x1a0 [<ffffffff8149e4be>] ? netlink_sendmsg+0x50e/0x630 [<ffffffff8145209c>] ? sock_sendmsg+0x3c/0x50 [<ffffffff81452beb>] ? ___sys_sendmsg+0x27b/0x290 [<ffffffff811bd258>] ? mem_cgroup_try_charge+0x88/0x110 [<ffffffff811bd5b6>] ? mem_cgroup_commit_charge+0x56/0xa0 [<ffffffff811d7700>] ? do_filp_open+0x30/0xa0 [<ffffffff8145336e>] ? __sys_sendmsg+0x3e/0x80 [<ffffffff8156c3f2>] ? system_call_fastpath+0x16/0x75 Fix this by unregistering the previous sysctl table (registered for the path containing the original device name) and re-registering the table for the path containing the new device name. Fixes: 37bde79979c3 ("mpls: Per-device enabling of packet input") Reported-by: Scott Feldman <sfeldma@gmail.com> Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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