GRE tunneled packet on fabric interface crashing vrouter kernel when

the GRE tunnel is not configured on the interface. Reworked how the
relaxed policy check is enforeced int he code to avoid crashing. Crash
happened because packet processing went into a loop in vr_ip_rcv().

Change-Id: I6de49c70a30393c9d752273880b31f415dca1aa5
closes-bug: #1773979

dp-core/vr_proto_ip.c

@@ -492,6 +492,7 @@ vr_ip_rcv(struct vrouter *router, struct vr_packet *pkt,
         struct vr_forwarding_md *fmd)
 {
     bool flow_processing = false;
+    bool relaxed_policy_found =  false;
     unsigned int hlen;
     unsigned short drop_reason, l4_port = 0;
     int unhandled = 1;
@@ -580,8 +581,10 @@ vr_ip_rcv(struct vrouter *router, struct vr_packet *pkt,
                         }
 
                         if (l4_port && vr_valid_link_local_port(router, AF_INET,
-                                         ip->ip_proto, ntohs(l4_port)))
+                                         ip->ip_proto, ntohs(l4_port))) {
                             flow_processing = true;
+                            relaxed_policy_found = true;
+			}
                     }
                 }
             }
@@ -606,7 +609,7 @@ vr_ip_rcv(struct vrouter *router, struct vr_packet *pkt,
                  * gets marked in fmd_to_me, lets subject it l3
                  * processing again.
                  */
-                if (fmd->fmd_to_me || (pkt->vp_nh->nh_flags & NH_FLAG_RELAXED_POLICY)) {
+                if (fmd->fmd_to_me || relaxed_policy_found) {
                     if (!vr_l3_input(pkt, fmd)) {
                         drop_reason = VP_DROP_NOWHERE_TO_GO;
                         goto drop_pkt;