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macvlan: Support creating macvtaps from macvlans

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When running in a network namespace whose only link to the outside
world is a macvlan device, not being able to create a macvtap off of
it is a real pain.

So modify macvtap creation to automatically forward a creation of a
macvtap on a macvlan to become a creation of a macvtap on the
underlying network device, just like is currently done with
macvlan-on-macvlan devices.

v2: Use netif_is_macvlan and macvlan_dev_real_dev helpers to make it
    more clear what we're doing.

Signed-off-by: Kevin Wallace <kevin@pentabarf.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kevin Wallace 2013-12-03 02:55:22 -08:00 committed by David S. Miller
parent 426e1fa31e
commit d70f2cf520
1 changed files with 3 additions and 5 deletions
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8
drivers/net/macvlan.c
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@ -820,13 +820,11 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
if (lowerdev == NULL)
return -ENODEV;
/* When creating macvlans on top of other macvlans - use
/* When creating macvlans or macvtaps on top of other macvlans - use
* the real device as the lowerdev.
*/
if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
lowerdev = lowervlan->lowerdev;
}
if (netif_is_macvlan(lowerdev))
lowerdev = macvlan_dev_real_dev(lowerdev);
if (!tb[IFLA_MTU])
dev->mtu = lowerdev->mtu;