net: vxlan: lwt: Fix vxlan local traffic.

BugLink: https://bugs.launchpad.net/bugs/1878232

commit bbec7802 upstream.

vxlan driver has bypass for local vxlan traffic, but that
depends on information about all VNIs on local system in
vxlan driver. This is not available in case of LWT.
Therefore following patch disable encap bypass for LWT
vxlan traffic.

Fixes: ee122c79 ("vxlan: Flow based tunneling").
Reported-by: Jakub Libosvar <jlibosva@redhat.com>
Signed-off-by: Pravin B Shelar <pshelar@ovn.org>
Acked-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/net/vxlan.c

@@ -2222,7 +2222,7 @@ static void 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 (!info && rt->rt_flags & RTCF_LOCAL &&
 		    !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
 			struct vxlan_dev *dst_vxlan;
 
@@ -2280,7 +2280,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 
 		/* Bypass encapsulation if the destination is local */
 		rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
-		if (rt6i_flags & RTF_LOCAL &&
+		if (!info && rt6i_flags & RTF_LOCAL &&
 		    !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
 			struct vxlan_dev *dst_vxlan;