netdev - [PATCH net v2] ip_tunnel: Set network header properly for IP_ECN

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Message-ID: <CAL1qit8cy1GOfpdu+LxrFuvegSoC_GFvE67gnfFMBW224hhNAQ@mail.gmail.com>
Date:	Sat, 3 May 2014 22:40:03 -0700
From:	Ying Cai <ycai@...gle.com>
To:	netdev <netdev@...r.kernel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>, pshelar@...ira.com
Subject: [PATCH net v2] 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@...gle.com>
Signed-off-by: Ying Cai <ycai@...gle.com>
Acked-by: Neal Cardwell <ncardwell@...gle.com>
---
 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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