netdev - [PATCH net-next v11 2/6] gre: unset mac header for non-TEB packets received by ipgre device

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Date:	Wed,  6 Jul 2016 19:59:52 +0200
From:	Simon Horman <simon.horman@...ronome.com>
To:	netdev@...r.kernel.org
Cc:	dev@...nvswitch.org
Subject: [PATCH net-next v11 2/6] gre: unset mac header for non-TEB packets received by ipgre device

unset rather than reset mach header for non-TEB packets received by an
ipgre device.  This allows skb_transport_header_was_set to be subsequently
used to differentiate TEB and non-TEB packets recieved on an ipgre device.

Signed-off-by: Simon Horman <simon.horman@...ronome.com>
---
v11
* New patch
---
 net/ipv4/ip_gre.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 5b1481be0282..330d58e9c523 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -283,6 +283,8 @@ static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
 
 		if (tunnel->dev->type != ARPHRD_NONE)
 			skb_pop_mac_header(skb);
+		else if (tpi->proto != htons(ETH_P_TEB))
+			skb_unset_mac_header(skb);
 		else
 			skb_reset_mac_header(skb);
 		if (tunnel->collect_md) {
-- 
2.7.0.rc3.207.g0ac5344