mpls: allow routes on ipip and sit devices

Allow MPLS routes on IPIP and SIT devices now that they
support forwarding MPLS packets.

Signed-off-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Dinan Gunawardena <dinan.gunawardena@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index e9beaa5..5c161e7 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -1009,10 +1009,12 @@
 	unsigned int flags;
 
 	if (event == NETDEV_REGISTER) {
-		/* For now just support Ethernet and IPGRE devices */
+		/* For now just support Ethernet, IPGRE, SIT and IPIP devices */
 		if (dev->type == ARPHRD_ETHER ||
 		    dev->type == ARPHRD_LOOPBACK ||
-		    dev->type == ARPHRD_IPGRE) {
+		    dev->type == ARPHRD_IPGRE ||
+		    dev->type == ARPHRD_SIT ||
+		    dev->type == ARPHRD_TUNNEL) {
 			mdev = mpls_add_dev(dev);
 			if (IS_ERR(mdev))
 				return notifier_from_errno(PTR_ERR(mdev));