path: root/net/ipv4/ip_tunnel.c
diff options
authorAlexander Duyck <alexander.h.duyck@intel.com>2013-07-11 13:12:22 -0700
committerDavid S. Miller <davem@davemloft.net>2013-07-11 16:12:03 -0700
commit8c91e162e058bb91b7766f26f4d5823a21941026 (patch)
tree430170c009409c6ea04eae1718e232a2a8c0621a /net/ipv4/ip_tunnel.c
parent88d4f419a43b474a4524f41f55c36bee13416bdd (diff)
gre: Fix MTU sizing check for gretap tunnels
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>
Diffstat (limited to 'net/ipv4/ip_tunnel.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 945734b2f209..ca1cb2d5f6e2 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -476,7 +476,7 @@ 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)