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vxlan: Update hard_header_len based on lowerdev when instantiating VXLAN 

In the event of a VXLAN device being linked to a device that has a
hard_header_len greater than that of standard ethernet we could end up with
the hard_header_len not being large enough for outgoing frames.  In order to
prevent this we should update the length when a lowerdev is provided.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2012-11-13 13:10:59 +00:00 committed by David S. Miller
parent eb5ce43997
commit 1ba56fb45a
1 changed files with 4 additions and 0 deletions
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4
drivers/net/vxlan.c
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@ -1102,6 +1102,10 @@ static int vxlan_newlink(struct net *net, struct net_device *dev,
if (!tb[IFLA_MTU])
dev->mtu = lowerdev->mtu - VXLAN_HEADROOM;
/* update header length based on lower device */
dev->hard_header_len = lowerdev->hard_header_len +
VXLAN_HEADROOM;
}
if (data[IFLA_VXLAN_TOS])