From 764e433b3c43d47e2d19e4bd32fec093421b9cff Mon Sep 17 00:00:00 2001 From: Mahesh Bandewar Date: Sat, 6 Dec 2014 15:53:19 -0800 Subject: [PATCH] ipvlan: play well with macvlan device 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 Signed-off-by: David S. Miller --- drivers/net/ipvlan/ipvlan_main.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c index feb185389a87..a66ff8197008 100644 --- a/drivers/net/ipvlan/ipvlan_main.c +++ b/drivers/net/ipvlan/ipvlan_main.c @@ -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; -- 2.20.1