[ 31/79] gre: Fix MTU sizing check for gretap tunnels

From: Greg Kroah-Hartman
Date: Fri Jul 26 2013 - 17:35:48 EST

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


From: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>

[ Upstream commit 8c91e162e058bb91b7766f26f4d5823a21941026 ]

This change fixes an MTU sizing issue seen with gretap tunnels when non-gso
packets are sent from the interface.

In my case I was able to reproduce the issue by simply sending a ping of
1421 bytes with the gretap interface created on a device with a standard
1500 mtu.

This fix is based on the fact that the tunnel mtu is already adjusted by
dev->hard_header_len so it would make sense that any packets being compared
against that mtu should also be adjusted by hard_header_len and the tunnel
header instead of just the tunnel header.

Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Reported-by: Cong Wang <amwang@xxxxxxxxxx>
Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/ipv4/ip_tunnel.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -490,7 +490,7 @@ static int tnl_update_pmtu(struct net_de
struct rtable *rt, __be16 df)
struct ip_tunnel *tunnel = netdev_priv(dev);
- int pkt_size = skb->len - tunnel->hlen;
+ int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len;
int mtu;

if (df)

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