netdev - [PATCH net] ip_tunnel: Set network header properly for IP_ECN

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Message-ID: <CAL1qit8_M+D_GM9EPeUUBgPdpHNANXeZjGO1vJ6NOS9OUhEZMg@mail.gmail.com>
Date:	Sat, 3 May 2014 12:22:52 -0700
From:	Ying Cai <ycai@...gle.com>
To:	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>
Subject: [PATCH net] 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.
---
 net/ipv4/ip_tunnel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index fa5b751..b3f8597 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)
--
1.9.1.423.g4596e3a
--
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