From: Mahesh Bandewar <maheshb@google.com>
Date: Sat, 6 Dec 2014 23:53:46 +0000 (-0800)
Subject: macvlan: play well with ipvlan device
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d6b00fec5dbbe976904b4d77e7d4f9493df5c2ec;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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 10604db2a3a0..612e0731142d 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1057,6 +1057,9 @@ static int macvlan_port_create(struct net_device *dev)
 	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;