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| author | Ying Cai <ycai@google.com> | 2014-05-04 15:20:04 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-05-05 16:32:17 -0400 |
| commit | e96f2e7c430014eff52c93cabef1ad4f42ed0db1 (patch) | |
| tree | 225d4491ce2e7bac9282a3ea9453313e2b14a61d /net/ipv4/ip_tunnel.c | |
| parent | 780ce3a225c4d6e85b5436d9beb95727b2c4e69f (diff) | |
| download | lwn-e96f2e7c430014eff52c93cabef1ad4f42ed0db1.tar.gz lwn-e96f2e7c430014eff52c93cabef1ad4f42ed0db1.zip | |
ip_tunnel: Set network header properly for IP_ECN_decapsulate()
In ip_tunnel_rcv(), set skb->network_header to inner IP header
before IP_ECN_decapsulate().
Without the fix, IP_ECN_decapsulate() takes outer IP header as
inner IP header, possibly causing error messages or packet drops.
Note that this skb_reset_network_header() call was in this spot when
the original feature for checking consistency of ECN bits through
tunnels was added in eccc1bb8d4b4 ("tunnel: drop packet if ECN present
with not-ECT"). It was only removed from this spot in 3d7b46cd20e3
("ip_tunnel: push generic protocol handling to ip_tunnel module.").
Fixes: 3d7b46cd20e3 ("ip_tunnel: push generic protocol handling to ip_tunnel module.")
Reported-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Ying Cai <ycai@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_tunnel.c')
| -rw-r--r-- | net/ipv4/ip_tunnel.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c index fa5b7519765f..b3f859731c60 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -442,6 +442,8 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, tunnel->i_seqno = ntohl(tpi->seq) + 1; } + skb_reset_network_header(skb); + err = IP_ECN_decapsulate(iph, skb); if (unlikely(err)) { if (log_ecn_error) |