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[MACVLAN]: Prevent nesting macvlan devices

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Don't allow to nest macvlan devices since it will cause lockdep
warnings and isn't really useful for anything.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-01-10 22:39:28 -08:00 committed by David S. Miller
parent 0fe1e567d0
commit a6ca5f1dbe
1 changed files with 7 additions and 0 deletions
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7
drivers/net/macvlan.c
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@ -384,6 +384,13 @@ static int macvlan_newlink(struct net_device *dev,
if (lowerdev == NULL)
return -ENODEV;
/* Don't allow macvlans on top of other macvlans - its not really
* wrong, but lockdep can't handle it and its not useful for anything
* you couldn't do directly on top of the real device.
*/
if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops)
return -ENODEV;
if (!tb[IFLA_MTU])
dev->mtu = lowerdev->mtu;
else if (dev->mtu > lowerdev->mtu)