macvlan: Support creating macvtaps from macvlans
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>
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index acf9379..cfb9157 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -820,13 +820,11 @@
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;