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linux/net/ipv6
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Andrea Mayer ffdc1ee2d6 seg6: add FIB table attribute for post-encap SID route lookup 
After SRv6 encapsulation the kernel looks up the route for the first SID,
that is the outer IPv6 destination of the encapsulated packet. This
post-encap SID route lookup uses the FIB table of the current routing
context. When the encap route is installed in a VRF, the VRF's table may
not have a route matching the SID. In that case another table should
handle it, e.g. one configured for underlay connectivity.

Add an optional SEG6_IPTUNNEL_TABLE attribute that selects the FIB table
used for this lookup. When set by the user, the attribute is honored on
both the input path (forwarded traffic) and the output path (locally
originated traffic). SRv6 encap routes that do not set the attribute use
the current routing context, as before.

For example:

  # SID route installed in the underlay table 500
  ip -6 route add fc00::100/128 via fd00::1 dev veth0 table 500

  # encap route in vrf-100; the first SID is looked up in table 500
  ip -6 route add cafe::1/128 vrf vrf-100 \
      encap seg6 mode encap segs fc00::100 lookup 500 dev veth0

  # or look up the SID in the main table
  ip -6 route add cafe::1/128 vrf vrf-100 \
      encap seg6 mode encap segs fc00::100 lookup main dev veth0

Suggested-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Reviewed-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20260711162907.6521-2-andrea.mayer@uniroma2.it
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-07-22 08:01:02 -07:00
..
ila net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
netfilter netfilter: handle unreadable frags 2026-07-08 15:33:44 +02:00
addrconf_core.c ipv6: remove obsolete EXPORT_SYMBOL() and EXPORT_SYMBOL_GPL() 2026-06-05 17:47:42 -07:00
addrconf.c net: ipv6: report multicast group user count 2026-07-03 08:50:44 +02:00
addrlabel.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
af_inet6.c tcp: rehash onto different local ECMP path on retransmit timeout 2026-06-15 15:57:31 -07:00
ah6.c xfrm: ah: use skb_to_full_sk in async output callbacks 2026-05-16 10:56:14 +02:00
anycast.c ipv6: anycast: insert aca into global hash under idev->lock 2026-06-02 19:30:39 -07:00
calipso.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
datagram.c ipv6: validate extension header length before copying to cmsg 2026-05-26 18:53:10 -07:00
esp6_offload.c xfrm: Fix inner mode lookup in tunnel mode GSO segmentation 2025-12-04 09:54:53 +01:00
esp6.c net: Use helpers to get/set UDP len tree-wide 2026-07-22 13:47:02 +02:00
exthdrs_core.c ipv6: Implement limits on extension header parsing 2026-04-30 17:21:45 -07:00
exthdrs_offload.c net: gso: add HBH extension header offload support 2024-01-05 08:11:49 -08:00
exthdrs.c ipv6: exthdrs: recompute network header pointer once 2026-06-03 19:14:56 -07:00
fib6_notifier.c net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
fib6_rules.c ipv6: fib_rules: Convert fib6_rules_net_exit_rtnl() to ->exit(). 2026-07-01 18:42:34 +02:00
fou6.c udp: Support BIG TCP GSO packets where they can occur 2026-07-22 13:47:02 +02:00
icmp.c ipv6: fix possible UAF in icmpv6_rcv() 2026-04-18 12:09:52 -07:00
inet6_connection_sock.c tcp: rehash onto different local ECMP path on retransmit timeout 2026-06-15 15:57:31 -07:00
inet6_hashtables.c tcp: use __jhash_final() in inet6_ehashfn() 2026-03-29 11:45:48 -07:00
ioam6_iptunnel.c ipv6: ioam: fix type confusion of dst_entry 2026-06-21 15:26:40 -07:00
ioam6.c net: ioam6: no longer acquire qdisc spinlock while calling qdisc_qstats_qlen_backlog() 2026-05-14 17:05:20 -07:00
ip6_checksum.c udp: Remove UDPLITE_SEND_CSCOV and UDPLITE_RECV_CSCOV. 2026-03-13 18:57:45 -07:00
ip6_fib.c ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump 2026-06-29 18:28:41 -07:00
ip6_flowlabel.c ipv6: use READ_ONCE() in ipv6_flowlabel_get() 2026-06-04 18:31:18 -07:00
ip6_gre.c net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink 2026-06-17 16:01:52 -07:00
ip6_icmp.c ipv6: remove dynamic ICMPv6 sender registration infrastructure 2026-03-29 11:21:23 -07:00
ip6_input.c ipv6: Implement limits on extension header parsing 2026-04-30 17:21:45 -07:00
ip6_offload.c net: pppoe: implement GRO/GSO support 2026-05-19 09:47:53 +02:00
ip6_offload.h
ip6_output.c ipv6: account for fraggap on the paged allocation path 2026-06-21 15:24:49 -07:00
ip6_tunnel.c netfilter: flowtable: fix and simplify IP6IP6 tunnel handling 2026-06-19 12:22:29 +02:00
ip6_udp_tunnel.c udp: Set length in UDP header to 0 for big GSO packets 2026-07-22 13:47:02 +02:00
ip6_vti.c net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink 2026-06-17 16:01:52 -07:00
ip6mr.c ipmr: Convert mr_table.cache_resolve_queue_len to u32. 2026-06-11 15:17:30 -07:00
ipcomp6.c xfrm: add extack to xfrm_init_state 2026-06-04 12:22:35 +02:00
ipv6_sockglue.c ipv6: Remove UDP-Lite support for IPV6_ADDRFORM. 2026-03-13 18:57:44 -07:00
Kconfig ipv6: default IPV6_SIT to m 2026-05-05 17:31:51 -07:00
Makefile netfilter: add option for GCOV profiling 2026-05-24 22:55:47 +02:00
mcast_snoop.c net: bridge: mcast: fix broken length + header check for MRDv6 Adv. 2021-04-27 14:02:06 -07:00
mcast.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-07-10 10:20:05 +02:00
mip6.c net: fill in MODULE_DESCRIPTION()s for ipv6 modules 2024-02-09 14:12:01 -08:00
ndisc.c ipv6: ndisc: fix NULL deref in accept_untracked_na() 2026-06-21 15:13:24 -07:00
netfilter.c netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment() 2026-07-10 16:28:47 +02:00
output_core.c ipv6: remove obsolete EXPORT_SYMBOL() and EXPORT_SYMBOL_GPL() 2026-06-05 17:47:42 -07:00
ping.c net: remove addr_len argument of recvmsg() handlers 2026-03-02 18:17:17 -08:00
proc.c udp: Remove UDP-Lite SNMP stats. 2026-03-13 18:57:44 -07:00
protocol.c
raw.c net: change sock_queue_rcv_skb_reason() to return a drop_reason 2026-04-12 14:30:25 -07:00
reassembly.c ipv6: frags: cleanup __IP6_INC_STATS() confusion 2026-05-27 17:27:26 -07:00
route.c ipv6: Fix null-ptr-deref in fib6_nh_mtu_change(). 2026-06-22 18:20:09 -07:00
rpl_iptunnel.c net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels 2026-04-28 11:16:14 +02:00
rpl.c ipv6: rpl: Remove pskb(_may)?_pull() in ipv6_rpl_srh_rcv(). 2023-06-19 11:32:58 -07:00
seg6_hmac.c ipv6: add NULL checks for idev in SRv6 paths 2026-03-18 17:23:43 -07:00
seg6_iptunnel.c seg6: add FIB table attribute for post-encap SID route lookup 2026-07-22 08:01:02 -07:00
seg6_local.c ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
seg6.c seg6: validate SRH length before reading fixed fields 2026-06-26 18:49:37 -07:00
sit.c net: sit: require CAP_NET_ADMIN in the device netns for changelink 2026-06-21 15:10:06 -07:00
syncookies.c tcp: rehash onto different local ECMP path on retransmit timeout 2026-06-15 15:57:31 -07:00
sysctl_net_ipv6.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
tcp_ao.c net/tcp-ao: Return void from functions that can no longer fail 2026-04-30 09:38:56 +02:00
tcp_ipv6.c tcp: fix TIME_WAIT socket reference leak on PSP policy failure 2026-07-17 11:53:55 +02:00
tcpv6_offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-01-29 17:28:54 -08:00
tunnel6.c net: fill in MODULE_DESCRIPTION()s for ipv6 modules 2024-02-09 14:12:01 -08:00
udp_offload.c udp: Support gro_ipv4_max_size > 65536 2026-07-22 13:47:02 +02:00
udp.c Merge branch 'big-tcp-for-udp-tunnels' 2026-07-22 13:49:03 +02:00
xfrm6_input.c xfrm: Fix dev use-after-free in xfrm async resumption 2026-06-12 08:39:59 +02:00
xfrm6_output.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
xfrm6_policy.c xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst() 2026-07-06 08:29:08 +02:00
xfrm6_protocol.c ipv6: xfrm6: release dst on error in xfrm6_rcv_encap() 2026-04-17 10:40:29 +02:00
xfrm6_state.c
xfrm6_tunnel.c xfrm: flush all states in xfrm_state_fini 2025-08-06 09:23:38 +02:00