linux-kernel - [PATCH 4.8 32/35] ip6_tunnel: Update skb->protocol to ETH_P_IPV6 in ip6_tnl

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Message-Id: <20161113112422.152081687@linuxfoundation.org>
Date:   Sun, 13 Nov 2016 12:27:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eli Cooper <elicooper@....com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.8 32/35] ip6_tunnel: Update skb->protocol to ETH_P_IPV6 in ip6_tnl_xmit()

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eli Cooper <elicooper@....com>


[ Upstream commit ae148b085876fa771d9ef2c05f85d4b4bf09ce0d ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/ip6_tunnel.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1134,6 +1134,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, st
 	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);