l2: skip arp term for locally originated packets

Mark arp packet as locally originated when probing/replying and don't apply any
arp-term logic against it.

Type: fix
Signed-off-by: Stanislav Zaikin <zstaseg@gmail.com>
Change-Id: I305ff5cac8cac456decf92f21b961aa4ce286079

src/vnet/arp/arp_packet.h

@@ -68,6 +68,8 @@ arp_mk_reply (vnet_main_t * vnm,
   clib_mem_unaligned (&arp0->ip4_over_ethernet[0].ip4.data_u32, u32) =
     if_addr0->data_u32;
 
+  p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+
   /* Hardware must be ethernet-like. */
   ASSERT (vec_len (hw_if0->hw_address) == 6);
 

src/vnet/ip-neighbor/ip4_neighbor.h

@@ -61,6 +61,7 @@ ip4_neighbor_probe (vlib_main_t *vm, vnet_main_t *vnm,
   h0->ip4_over_ethernet[1].ip4 = *dst;
 
   vnet_buffer (b0)->sw_if_index[VLIB_TX] = adj0->rewrite_header.sw_if_index;
+  b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
 
   vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
 

src/vnet/l2/l2_arp_term.c

@@ -290,6 +290,9 @@ arp_term_l2bd (vlib_main_t * vm,
 	  ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
 	  arp0 = (ethernet_arp_header_t *) l3h0;
 
+	  if (p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)
+	    goto next_l2_feature;
+
 	  if (ethertype0 != ETHERNET_TYPE_ARP)
 	    goto check_ip6_nd;