NAT64: Input feature arc on virtual interface via interface RX DPO.

Change-Id: If2048c7d72048679bc5d0412f3fae109926f759e
Signed-off-by: Ole Troan <ot@cisco.com>

3 files changed, 46 insertions, 4 deletions

diff --git a/src/plugins/nat/nat64_cli.c b/src/plugins/nat/nat64_cli.c
index 4128eda5a38..7fea6bbb983 100644
--- a/src/plugins/nat/nat64_cli.c
+++ b/src/plugins/nat/nat64_cli.c
@@ -680,10 +680,11 @@ nat64_add_del_prefix_command_fn (vlib_main_t * vm, unformat_input_t * input,
 				 vlib_cli_command_t * cmd)
 {
   nat64_main_t *nm = &nat64_main;
+  vnet_main_t *vnm = vnet_get_main ();
   clib_error_t *error = 0;
   unformat_input_t _line_input, *line_input = &_line_input;
   u8 is_add = 1;
-  u32 vrf_id = 0;
+  u32 vrf_id = 0, sw_if_index = ~0;
   ip6_address_t prefix;
   u32 plen = 0;
   int rv;
@@ -705,6 +706,11 @@ nat64_add_del_prefix_command_fn (vlib_main_t * vm, unformat_input_t * input,
       else if (unformat (line_input, "del"))
 	is_add = 0;
       else
+	if (unformat
+	    (line_input, "interface %U", unformat_vnet_sw_interface, vnm,
+	     &sw_if_index))
+	;
+      else
 	{
 	  error = clib_error_return (0, "unknown input: '%U'",
 				     format_unformat_error, line_input);
@@ -732,6 +738,42 @@ nat64_add_del_prefix_command_fn (vlib_main_t * vm, unformat_input_t * input,
       break;
     }
 
+  /*
+   * Add RX interface route, whenNAT isn't running on the real input
+   * interface
+   */
+  if (sw_if_index != ~0)
+    {
+      u32 fib_index;
+      fib_prefix_t fibpfx = {
+	.fp_len = plen,
+	.fp_proto = FIB_PROTOCOL_IP6,
+	.fp_addr = {.ip6 = prefix}
+      };
+
+      if (is_add)
+	{
+	  fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6,
+							 vrf_id,
+							 FIB_SOURCE_PLUGIN_HI);
+	  fib_table_entry_update_one_path (fib_index, &fibpfx,
+					   FIB_SOURCE_PLUGIN_HI,
+					   FIB_ENTRY_FLAG_NONE, DPO_PROTO_IP6,
+					   NULL, sw_if_index, ~0, 0, NULL,
+					   FIB_ROUTE_PATH_INTF_RX);
+	}
+      else
+	{
+	  fib_index = fib_table_find (FIB_PROTOCOL_IP6, vrf_id);
+	  fib_table_entry_path_remove (fib_index, &fibpfx,
+				       FIB_SOURCE_PLUGIN_HI, DPO_PROTO_IP6,
+				       NULL, sw_if_index, ~0, 1,
+				       FIB_ROUTE_PATH_INTF_RX);
+	  fib_table_unlock (fib_index, FIB_PROTOCOL_IP6,
+			    FIB_SOURCE_PLUGIN_HI);
+	}
+    }
+
 done:
   unformat_free (line_input);
 
@@ -954,7 +996,7 @@ VLIB_CLI_COMMAND (show_nat64_st_command, static) = {
 VLIB_CLI_COMMAND (nat64_add_del_prefix_command, static) = {
   .path = "nat64 add prefix",
   .short_help = "nat64 add prefix <ip6-prefix>/<plen> [tenant-vrf <vrf-id>] "
-                "[del]",
+                "[del] [interface <interface]",
   .function = nat64_add_del_prefix_command_fn,
 };
 
diff --git a/src/vnet/dpo/interface_rx_dpo.c b/src/vnet/dpo/interface_rx_dpo.c
index caaee65a897..b4680f18f2a 100644
--- a/src/vnet/dpo/interface_rx_dpo.c
+++ b/src/vnet/dpo/interface_rx_dpo.c
@@ -154,7 +154,7 @@ format_interface_rx_dpo (u8* s, va_list *ap)
     vnet_main_t * vnm = vnet_get_main();
     interface_rx_dpo_t *ido = interface_rx_dpo_get(index);
 
-    return (format(s, "%U-dpo: %U",
+    return (format(s, "%U-rx-dpo: %U",
                    format_vnet_sw_interface_name,
                    vnm,
                    vnet_get_sw_interface(vnm, ido->ido_sw_if_index),
diff --git a/src/vnet/dpo/interface_tx_dpo.c b/src/vnet/dpo/interface_tx_dpo.c
index f7c8bfda85b..870579884a0 100644
--- a/src/vnet/dpo/interface_tx_dpo.c
+++ b/src/vnet/dpo/interface_tx_dpo.c
@@ -50,7 +50,7 @@ format_interface_tx_dpo (u8* s, va_list *ap)
     CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
     vnet_main_t * vnm = vnet_get_main();
 
-    return (format(s, "%U-dpo:",
+    return (format(s, "%U-tx-dpo:",
                    format_vnet_sw_interface_name,
                    vnm,
                    vnet_get_sw_interface(vnm, index)));