This is a note to let you know that I've just added the patch titled
gre: Fix MTU sizing check for gretap tunnels
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
gre-fix-mtu-sizing-check-for-gretap-tunnels.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 60731ca136b36cde13dd6b021711f031d70e061f Mon Sep 17 00:00:00 2001
From: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Date: Thu, 11 Jul 2013 13:12:22 -0700
Subject: gre: Fix MTU sizing check for gretap tunnels
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)
Patches currently in stable-queue which might be from alexander.h.duyck@xxxxxxxxx are
queue-3.10/gre-fix-mtu-sizing-check-for-gretap-tunnels.patch
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