tapv2: add option to set host-side default gw

Change-Id: I76fd655ecd9445299b94b3b5af10e7b1588584e4
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vnet/devices/tap/tapv2_api.c b/src/vnet/devices/tap/tapv2_api.c
index 9f46884..34472c0 100644
--- a/src/vnet/devices/tap/tapv2_api.c
+++ b/src/vnet/devices/tap/tapv2_api.c
@@ -96,6 +96,18 @@
       ap->host_ip6_prefix_len = mp->host_ip6_prefix_len;
     }
 
+  if (mp->host_ip4_gw_set)
+    {
+      clib_memcpy (&ap->host_ip4_gw, mp->host_ip4_gw, 4);
+      ap->host_ip4_gw_set = 1;
+    }
+
+  if (mp->host_ip6_gw_set)
+    {
+      clib_memcpy (&ap->host_ip6_gw, mp->host_ip6_gw, 16);
+      ap->host_ip6_gw_set = 1;
+    }
+
   tap_create_if (vm, ap);
 
   reg = vl_api_client_index_to_registration (mp->client_index);