gbp: add anonymous l3-out external interfaces

So far, GBP l3-out packets classification & policy relied on programmed
EP. All traffic to/from l3-out must go through a known EP.
This patch introduces a new feature where l3-out next-hops are only
known by their subnets (l3-out prefixes). As there are no longer known
EPs to program, an interface must be configured as external anonymous
l3-out. Packets classification & policy on this interface will rely on
the external subnets programmed in the BD VRF.
Note that contrary to all other interfaces in a GBP BD, external
anonymous l3-out interfaces have BD L2 learning turned on and rely on
ARP/ND.

Type: feature

Change-Id: Ieedb29dff4e967d08c4301e82d06bff450a63e5f
Signed-off-by: Benoît Ganne <bganne@cisco.com>

1 files changed, 30 insertions, 1 deletions

diff --git a/src/plugins/gbp/gbp_api.c b/src/plugins/gbp/gbp_api.c
index 8155a8ff0f1..010e3087eb3 100644
--- a/src/plugins/gbp/gbp_api.c
+++ b/src/plugins/gbp/gbp_api.c
@@ -82,7 +82,8 @@
   _(GBP_CONTRACT_DUMP, gbp_contract_dump)                   \
   _(GBP_VXLAN_TUNNEL_ADD, gbp_vxlan_tunnel_add)             \
   _(GBP_VXLAN_TUNNEL_DEL, gbp_vxlan_tunnel_del)             \
-  _(GBP_VXLAN_TUNNEL_DUMP, gbp_vxlan_tunnel_dump)
+  _(GBP_VXLAN_TUNNEL_DUMP, gbp_vxlan_tunnel_dump)           \
+  _(GBP_EXT_ITF_ANON_ADD_DEL, gbp_ext_itf_anon_add_del)
 
 gbp_main_t gbp_main;
 
@@ -1146,6 +1147,34 @@ vl_api_gbp_vxlan_tunnel_dump_t_handler (vl_api_gbp_vxlan_tunnel_dump_t * mp)
   gbp_vxlan_walk (gbp_vxlan_tunnel_send_details, &ctx);
 }
 
+static void
+vl_api_gbp_ext_itf_anon_add_del_t_handler (vl_api_gbp_ext_itf_anon_add_del_t *
+					   mp)
+{
+  vl_api_gbp_ext_itf_anon_add_del_reply_t *rmp;
+  u32 sw_if_index = ~0;
+  vl_api_gbp_ext_itf_t *ext_itf;
+  int rv = 0;
+
+  ext_itf = &mp->ext_itf;
+  if (ext_itf)
+    sw_if_index = ntohl (ext_itf->sw_if_index);
+
+  if (!vnet_sw_if_index_is_api_valid (sw_if_index))
+    goto bad_sw_if_index;
+
+  if (mp->is_add)
+    rv = gbp_ext_itf_anon_add (sw_if_index,
+			       ntohl (ext_itf->bd_id),
+			       ntohl (ext_itf->rd_id));
+  else
+    rv = gbp_ext_itf_anon_delete (sw_if_index);
+
+  BAD_SW_IF_INDEX_LABEL;
+
+  REPLY_MACRO (VL_API_GBP_EXT_ITF_ANON_ADD_DEL_REPLY + GBP_MSG_BASE);
+}
+
 /*
  * gbp_api_hookup
  * Add vpe's API message handlers to the table.