netdev - [PATCH net v2 2/3] ipv6: Set skb->protocol properly for local output

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Message-Id: <20161201020512.21661-2-elicooper@gmx.com>
Date:   Thu,  1 Dec 2016 10:05:11 +0800
From:   Eli Cooper <elicooper@....com>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>
Cc:     Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net v2 2/3] ipv6: Set skb->protocol properly for local output

When xfrm is applied to TSO/GSO packets, it follows this path:

    xfrm_output() -> xfrm_output_gso() -> skb_gso_segment()

where skb_gso_segment() relies on skb->protocol to function properly.

This patch sets skb->protocol to ETH_P_IPV6 before dst_output() is called,
fixing a bug where GSO packets sent through an ipip6 tunnel are dropped
when xfrm is involved.

Cc: stable@...r.kernel.org
Signed-off-by: Eli Cooper <elicooper@....com>
---
v2: place the assignment before the netfilter hook

 net/ipv6/output_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index 7cca8ac..cd42523 100644
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -155,6 +155,8 @@ int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 	if (unlikely(!skb))
 		return 0;

+	skb->protocol = htons(ETH_P_IPV6);
+
 	return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
 		       net, sk, skb, NULL, skb_dst(skb)->dev,
 		       dst_output);
-- 
2.10.2