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-rw-r--r--drivers/net/tun.c2
-rw-r--r--include/linux/if_tun.h1
2 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 589f0ca668d..94622e5fb93 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -874,6 +874,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
dev = __dev_get_by_name(net, ifr->ifr_name);
if (dev) {
+ if (ifr->ifr_flags & IFF_TUN_EXCL)
+ return -EBUSY;
if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops)
tun = netdev_priv(dev);
else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops)
diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h
index 049d6c9428d..915ba5789f0 100644
--- a/include/linux/if_tun.h
+++ b/include/linux/if_tun.h
@@ -55,6 +55,7 @@
#define IFF_NO_PI 0x1000
#define IFF_ONE_QUEUE 0x2000
#define IFF_VNET_HDR 0x4000
+#define IFF_TUN_EXCL 0x8000
/* Features for GSO (TUNSETOFFLOAD). */
#define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */