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authorAlexander Duyck <alexander.h.duyck@intel.com>2013-07-11 13:12:22 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-28 16:30:02 -0700
commit6afbcb59964ec9dc3dd63ed96a9e2cda31f8a072 (patch)
tree6aa13e211fe1cd87b341bab8069f1c69b7d92c81 /net
parentf84ddbc58cfd8551757efe3c61242c4d6e9918ce (diff)
downloadvexpress-lsk-6afbcb59964ec9dc3dd63ed96a9e2cda31f8a072.tar.gz
gre: Fix MTU sizing check for gretap tunnels
[ 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@intel.com> Reported-by: Cong Wang <amwang@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_tunnel.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index d05bd02886e..cbfc37f5f05 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -490,7 +490,7 @@ static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
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)