vxlan: don't bypass encapsulation for multi- and broadcasts

The multicast and broadcast packets may have RTCF_LOCAL set in rt_flags
and therefore will be sent out bypassing encapsulation. This breaks
delivery of packets sent to the vxlan multicast group.
Disabling encapsulation bypass for multicasts and broadcasts fixes the
issue.

Signed-off-by: Mike Rapoport <mike.rapoport@ravellosystems.com>
Tested-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Sridhar Samudrala <sri@us.ibm.com>
Tested-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vxlan.c

@@ -1014,7 +1014,8 @@ static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 	}
 
 	/* Bypass encapsulation if the destination is local */
-	if (rt->rt_flags & RTCF_LOCAL) {
+	if (rt->rt_flags & RTCF_LOCAL &&
+	    !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
 		struct vxlan_dev *dst_vxlan;
 
 		ip_rt_put(rt);