macvlan: play well with ipvlan device
If device is already used as an ipvlan port then refuse to
use it as a macvlan port at early stage of port creation.
thost1:~# ip link add link eth0 ipvl0 type ipvlan
thost1:~# echo $?
0
thost1:~# ip link add link eth0 mvl0 type macvlan
RTNETLINK answers: Device or resource busy
thost1:~# echo $?
2
thost1:~#
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 10604db..612e073 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1057,6 +1057,9 @@
if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
return -EINVAL;
+ if (netif_is_ipvlan_port(dev))
+ return -EBUSY;
+
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (port == NULL)
return -ENOMEM;