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ipvlan: play well with macvlan device

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If a device is already a macvlan port then refuse to use it as
an ipvlan port in the early stage of port creation.

	thost1:~# ip link add link eth0 mvl0 type macvlan
	thost1:~# echo $?
	0
	thost1:~# ip link add link eth0 ipvl0 type ipvlan
	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>
This commit is contained in:
Mahesh Bandewar 2014-12-06 15:53:19 -08:00 committed by David S. Miller
parent 2f33e7d59c
commit 764e433b3c
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ipvlan/ipvlan_main.c
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@ -38,6 +38,12 @@ static int ipvlan_port_create(struct net_device *dev)
netdev_err(dev, "Master is either lo or non-ether device\n");
return -EINVAL;
}
if (netif_is_macvlan_port(dev)) {
netdev_err(dev, "Master is a macvlan port.\n");
return -EBUSY;
}
port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
if (!port)
return -ENOMEM;