controller: fix ip buffering with static routes

When the ARP request is sent to a gw router and not to the final
destination of the packet buffered_packets_map needs to be updated using
next-hop IP address and not the destination one.

Fixes: 2e5cdb4 ("OVN: add buffering support for ip packets")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Acked-by: Ankur Sharma <ankur.sharma@nutanix.com>
Signed-off-by: Numan Siddique <numans@ovn.org>

controller/pinctrl.c

@@ -1381,8 +1381,7 @@ pinctrl_find_buffered_packets(const struct in6_addr *ip, uint32_t hash)
 
 /* Called with in the pinctrl_handler thread context. */
 static int
-pinctrl_handle_buffered_packets(const struct flow *ip_flow,
-                                struct dp_packet *pkt_in,
+pinctrl_handle_buffered_packets(struct dp_packet *pkt_in,
                                 const struct match *md, bool is_arp)
     OVS_REQUIRES(pinctrl_mutex)
 {
@@ -1391,9 +1390,10 @@ pinctrl_handle_buffered_packets(const struct flow *ip_flow,
     struct in6_addr addr;
 
     if (is_arp) {
-        addr = in6_addr_mapped_ipv4(ip_flow->nw_dst);
+        addr = in6_addr_mapped_ipv4(htonl(md->flow.regs[0]));
     } else {
-        addr = ip_flow->ipv6_dst;
+        ovs_be128 ip6 = hton128(flow_get_xxreg(&md->flow, 0));
+        memcpy(&addr, &ip6, sizeof addr);
     }
 
     uint32_t hash = hash_bytes(&addr, sizeof addr, 0);
@@ -1434,7 +1434,7 @@ pinctrl_handle_arp(struct rconn *swconn, const struct flow *ip_flow,
     }
 
     ovs_mutex_lock(&pinctrl_mutex);
-    pinctrl_handle_buffered_packets(ip_flow, pkt_in, md, true);
+    pinctrl_handle_buffered_packets(pkt_in, md, true);
     ovs_mutex_unlock(&pinctrl_mutex);
 
     /* Compose an ARP packet. */
@@ -5281,7 +5281,7 @@ pinctrl_handle_nd_ns(struct rconn *swconn, const struct flow *ip_flow,
     }
 
     ovs_mutex_lock(&pinctrl_mutex);
-    pinctrl_handle_buffered_packets(ip_flow, pkt_in, md, false);
+    pinctrl_handle_buffered_packets(pkt_in, md, false);
     ovs_mutex_unlock(&pinctrl_mutex);
 
     uint64_t packet_stub[128 / 8];