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authorAlexander Ovechkin <ovov@yandex-team.ru>2020-10-29 20:10:12 +0300
committerJakub Kicinski <kuba@kernel.org>2020-10-30 08:07:30 -0700
commit9e7c5b396e98eed859d3dd1ab235912a296faab5 (patch)
treee845c782674b4778e1d5dd9b1027fce1d999f69d /net/ipv6
parent07e0887302450a62f51dba72df6afb5fabb23d1c (diff)
ip6_tunnel: set inner ipproto before ip6_tnl_encap
ip6_tnl_encap assigns to proto transport protocol which encapsulates inner packet, but we must pass to set_inner_ipproto protocol of that inner packet. Calling set_inner_ipproto after ip6_tnl_encap might break gso. For example, in case of encapsulating ipv6 packet in fou6 packet, inner_ipproto would be set to IPPROTO_UDP instead of IPPROTO_IPV6. This would lead to incorrect calling sequence of gso functions: ipv6_gso_segment -> udp6_ufo_fragment -> skb_udp_tunnel_segment -> udp6_ufo_fragment instead of: ipv6_gso_segment -> udp6_ufo_fragment -> skb_udp_tunnel_segment -> ip6ip6_gso_segment Fixes: 6c11fbf97e69 ("ip6_tunnel: add MPLS transmit support") Signed-off-by: Alexander Ovechkin <ovov@yandex-team.ru> Link: https://lore.kernel.org/r/20201029171012.20904-1-ovov@yandex-team.ru Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ip6_tunnel.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index a0217e5bf3bc..648db3fe508f 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1271,6 +1271,8 @@ route_lookup:
if (max_headroom > dev->needed_headroom)
dev->needed_headroom = max_headroom;
+ skb_set_inner_ipproto(skb, proto);
+
err = ip6_tnl_encap(skb, t, &proto, fl6);
if (err)
return err;
@@ -1280,8 +1282,6 @@ route_lookup:
ipv6_push_frag_opts(skb, &opt.ops, &proto);
}
- skb_set_inner_ipproto(skb, proto);
-
skb_push(skb, sizeof(struct ipv6hdr));
skb_reset_network_header(skb);
ipv6h = ipv6_hdr(skb);