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authorEric Biederman <ebiederm@aristanetworks.com>2009-03-13 13:15:37 -0700
committerDavid S. Miller <davem@davemloft.net>2009-03-13 13:15:37 -0700
commitb0832a2961022a076c812384435b5f0290b3fc91 (patch)
treeca4d0a09e9aabc00f1960a8fb4f2ebd82f49ba8f /drivers/net/macvlan.c
parentf7efb6ccc2113911e4e064f78bcd0343c4673038 (diff)
macvlan: Support creating macvlans from macvlans
When running in a network namespace whose only link to the outside world is a macvlan device, not being able to create another macvlan is a real pain. So modify macvlan creation to allow automatically forward a creation of a macvlan on a macvlan to become a creation of a macvlan on the underlying network device. Signed-off-by: Eric Biederman <ebiederm@aristanetworks.com> Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macvlan.c')
-rw-r--r--drivers/net/macvlan.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 7e24b5048686..b5241fc0f512 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -461,12 +461,13 @@ 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.
+ /* When creating macvlans on top of other macvlans - use
+ * the real device as the lowerdev.
*/
- if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops)
- return -ENODEV;
+ if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
+ struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
+ lowerdev = lowervlan->lowerdev;
+ }
if (!tb[IFLA_MTU])
dev->mtu = lowerdev->mtu;