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510e2ceda0
linux/net/ipv6
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Wei Wang 510e2ceda0 ipv6: fix src addr routing with the exception table 
When inserting route cache into the exception table, the key is
generated with both src_addr and dest_addr with src addr routing.
However, current logic always assumes the src_addr used to generate the
key is a /128 host address. This is not true in the following scenarios:
1. When the route is a gateway route or does not have next hop.
   (rt6_is_gw_or_nonexthop() == false)
2. When calling ip6_rt_cache_alloc(), saddr is passed in as NULL.
This means, when looking for a route cache in the exception table, we
have to do the lookup twice: first time with the passed in /128 host
address, second time with the src_addr stored in fib6_info.

This solves the pmtu discovery issue reported by Mikael Magnusson where
a route cache with a lower mtu info is created for a gateway route with
src addr. However, the lookup code is not able to find this route cache.

Fixes: 2b760fcf5c ("ipv6: hook up exception table to store dst cache")
Reported-by: Mikael Magnusson <mikael.kernel@lists.m7n.se>
Bisected-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Wei Wang <weiwan@google.com>
Cc: Martin Lau <kafai@fb.com>
Cc: Eric Dumazet <edumazet@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-16 14:30:53 -07:00
..
ila genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
netfilter netfilter: x_tables: merge ip and ipv6 masquerade modules 2019-04-11 20:59:29 +02:00
addrconf_core.c ipv6: Pass fib6_result to fib lookups 2019-04-17 23:10:47 -07:00
addrconf.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
addrlabel.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
af_inet6.c net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
ah6.c
anycast.c net/ipv6: compute anycast address hash only if dev is null 2018-11-08 17:04:43 -08:00
calipso.c ipv6: make ipv6_renew_options() interrupt/kernel safe 2018-07-05 20:15:26 +09:00
datagram.c ipv6: fix kernel-infoleak in ipv6_local_error() 2019-01-10 09:36:41 -05:00
esp6_offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-05-02 22:14:21 -04:00
esp6.c esp: Skip TX bytes accounting when sending from a request socket 2019-01-28 11:20:58 +01:00
exthdrs_core.c net: ipv6: Fix typo in ipv6_find_hdr() documentation 2018-05-07 23:50:27 -04:00
exthdrs_offload.c
exthdrs.c ipv6: make ipv6_renew_options() interrupt/kernel safe 2018-07-05 20:15:26 +09:00
fib6_notifier.c
fib6_rules.c ipv6: Use result arg in fib_lookup_arg consistently 2019-04-23 21:53:11 -07:00
fou6.c fou, fou6: avoid uninit-value in gue_err() and gue6_err() 2019-03-08 15:19:53 -08:00
icmp.c ipv6: Add rate limit mask for ICMPv6 messages 2019-04-18 16:58:37 -07:00
inet6_connection_sock.c
inet6_hashtables.c net: tcp6: prefer listeners bound to an address 2018-12-14 15:55:20 -08:00
ip6_checksum.c net: udp: fix handling of CHECKSUM_COMPLETE packets 2018-10-24 14:18:16 -07:00
ip6_fib.c ipv6: prevent possible fib6 leaks 2019-05-16 12:21:00 -07:00
ip6_flowlabel.c ipv6/flowlabel: wait rcu grace period before put_pid() 2019-04-29 23:30:13 -04:00
ip6_gre.c net: ip6_gre: fix possible use-after-free in ip6erspan_rcv 2019-04-08 16:16:47 -07:00
ip6_icmp.c
ip6_input.c net: use indirect calls helpers at early demux stage 2019-05-05 10:38:04 -07:00
ip6_offload.c gso: validate gso_type on ipip style tunnels 2019-02-20 11:24:27 -08:00
ip6_offload.h
ip6_output.c neighbor: Add skip_cache argument to neigh_output 2019-04-08 15:22:41 -07:00
ip6_tunnel.c ip6_tunnel: Match to ARPHRD_TUNNEL6 for dev type 2019-04-02 13:19:34 -07:00
ip6_udp_tunnel.c net/ipv6/udp_tunnel: prefer SO_BINDTOIFINDEX over SO_BINDTODEVICE 2019-01-17 14:55:52 -08:00
ip6_vti.c xfrm: store xfrm_mode directly, not its address 2019-04-08 09:15:28 +02:00
ip6mr.c rhashtable: use bit_spin_locks to protect hash bucket. 2019-04-07 19:12:12 -07:00
ipcomp6.c
ipv6_sockglue.c net: ipv6: add socket option IPV6_ROUTER_ALERT_ISOLATE 2019-03-03 21:05:10 -08:00
Kconfig xfrm: make xfrm modes builtin 2019-04-08 09:15:17 +02:00
Makefile xfrm: make xfrm modes builtin 2019-04-08 09:15:17 +02:00
mcast_snoop.c net: remove unneeded switch fall-through 2019-02-21 13:48:00 -08:00
mcast.c bridge: join all-snoopers multicast address 2019-01-22 17:18:08 -08:00
mip6.c
ndisc.c net ipv6: Prevent neighbor add if protocol is disabled on device 2019-04-17 23:19:07 -07:00
netfilter.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2019-02-18 11:38:30 -08:00
output_core.c inet: switch IP ID generator to siphash 2019-03-27 14:29:26 -07:00
ping.c ipv6: fold sockcm_cookie into ipcm6_cookie 2018-07-07 10:58:49 +09:00
proc.c proc: introduce proc_create_net_single 2018-05-16 07:24:30 +02:00
protocol.c
raw.c net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
reassembly.c net: remove unused struct inet_frag_queue.fragments field 2019-02-26 08:27:05 -08:00
route.c ipv6: fix src addr routing with the exception table 2019-05-16 14:30:53 -07:00
seg6_hmac.c Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-07-03 10:29:26 +09:00
seg6_iptunnel.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
seg6_local.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
seg6.c genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
sit.c vrf: sit mtu should not be updated when vrf netdev is the link 2019-05-07 12:19:19 -07:00
syncookies.c
sysctl_net_ipv6.c ipv6: sr: Compute flowlabel for outer IPv6 header of seg6 encap mode 2018-04-25 13:02:15 -04:00
tcp_ipv6.c net: use indirect calls helpers at early demux stage 2019-05-05 10:38:04 -07:00
tcpv6_offload.c net: use indirect call wrappers at GRO transport layer 2018-12-15 13:23:02 -08:00
tunnel6.c net: Convert protocol error handlers from void to int 2018-11-08 17:13:08 -08:00
udp_impl.h udp6: add missing rehash callback to udplite 2019-01-17 15:01:08 -08:00
udp_offload.c net: use indirect call wrappers at GRO transport layer 2018-12-15 13:23:02 -08:00
udp.c net: use indirect calls helpers at early demux stage 2019-05-05 10:38:04 -07:00
udplite.c udp6: add missing rehash callback to udplite 2019-01-17 15:01:08 -08:00
xfrm6_input.c net: use skb_sec_path helper in more places 2018-12-19 11:21:37 -08:00
xfrm6_output.c xfrm: store xfrm_mode directly, not its address 2019-04-08 09:15:28 +02:00
xfrm6_policy.c xfrm: remove decode_session indirection from afinfo_policy 2019-04-23 07:42:20 +02:00
xfrm6_protocol.c xfrm: remove unneeded export_symbols 2019-04-23 07:42:20 +02:00
xfrm6_state.c xfrm: remove VLA usage in __xfrm6_sort() 2018-04-26 07:51:48 +02:00
xfrm6_tunnel.c xfrm: clean up xfrm protocol checks 2019-03-26 08:35:36 +01:00