tree 430170c009409c6ea04eae1718e232a2a8c0621a
parent 88d4f419a43b474a4524f41f55c36bee13416bdd
author Alexander Duyck <alexander.h.duyck@intel.com> 1373573542 -0700
committer David S. Miller <davem@davemloft.net> 1373584323 -0700

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>