netdev - [PATCH] ip6_tunnel: Update skb->protocol to ETH_P_IPV6 in ip6_tnl

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Date:   Wed, 26 Oct 2016 10:11:09 +0800
From:   Eli Cooper <elicooper@....com>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Tom Herbert <tom@...bertland.com>
Subject: [PATCH] ip6_tunnel: Update skb->protocol to ETH_P_IPV6 in ip6_tnl_xmit()

This patch updates skb->protocol to ETH_P_IPV6 in ip6_tnl_xmit() when an
IPv6 header is installed to a socket buffer.

This is not a cosmetic change.  Without updating this value, GSO packets
transmitted through an ipip6 tunnel have the protocol of ETH_P_IP and
skb_mac_gso_segment() will attempt to call gso_segment() for IPv4,
which results in the packets being dropped.

Fixes: b8921ca83eed ("ip4ip6: Support for GSO/GRO")
Signed-off-by: Eli Cooper <elicooper@....com>
---
 net/ipv6/ip6_tunnel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 202d16a..03e050d 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1172,6 +1172,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
 	if (err)
 		return err;

+	skb->protocol = htons(ETH_P_IPV6);
 	skb_push(skb, sizeof(struct ipv6hdr));
 	skb_reset_network_header(skb);
 	ipv6h = ipv6_hdr(skb);
-- 
2.10.1