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authorPatrick McHardy <kaber@trash.net>2008-01-11 07:39:28 +0100
committerDavid S. Miller <davem@davemloft.net>2008-01-11 07:39:28 +0100
commita6ca5f1dbe40470fcb1ecc921769d792a1e77ed9 (patch)
treec74e49b849ff9806aa4349587c3623cb90ddf0e6
parent[VLAN]: nested VLAN: fix lockdep's recursive locking warning (diff)
downloadlinux-a6ca5f1dbe40470fcb1ecc921769d792a1e77ed9.tar.xz
linux-a6ca5f1dbe40470fcb1ecc921769d792a1e77ed9.zip
[MACVLAN]: Prevent nesting macvlan devices
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>
-rw-r--r--drivers/net/macvlan.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 2e4bcd5654c4..e8dc2f44fec9 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -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)