urpf: add mode for specific fib index lookup

this patch adds a mode to urpf in order to perform the lookup in a specified vrf instead of the interface vrf
Type: feature
Change-Id: Ieb91de6ccdfbf32b6939364f3bebeecd2d57af19
Signed-off-by: hedi bouattour <hedibouattour2010@gmail.com>

1 files changed, 97 insertions, 14 deletions

diff --git a/src/plugins/urpf/urpf.c b/src/plugins/urpf/urpf.c
index 6cf7cda8744..3c3b33c769c 100644
--- a/src/plugins/urpf/urpf.c
+++ b/src/plugins/urpf/urpf.c
@@ -58,7 +58,8 @@ static const char *urpf_feats[N_AF][VLIB_N_DIR][URPF_N_MODES] =
 /**
  * Per-af, per-direction, per-interface uRPF configs
  */
-static urpf_mode_t *urpf_cfgs[N_AF][VLIB_N_DIR];
+
+urpf_data_t *urpf_cfgs[N_AF][VLIB_N_DIR];
 
 u8 *
 format_urpf_mode (u8 * s, va_list * a)
@@ -95,35 +96,106 @@ unformat_urpf_mode (unformat_input_t * input, va_list * args)
     return 0;
 }
 
-void
-urpf_update (urpf_mode_t mode,
-	     u32 sw_if_index, ip_address_family_t af, vlib_dir_t dir)
+int
+urpf_update (urpf_mode_t mode, u32 sw_if_index, ip_address_family_t af,
+	     vlib_dir_t dir, u32 table_id)
 {
-  urpf_mode_t old;
+  fib_protocol_t proto;
+  u32 fib_index;
+  if (table_id != ~0)
+    {
+      proto = ip_address_family_to_fib_proto (af);
+      fib_index = fib_table_find (proto, table_id);
+      if (fib_index == (~0))
+	return VNET_API_ERROR_INVALID_VALUE;
+    }
+  else
+    {
+      bool is_ip4 = (AF_IP4 == af);
+      u32 *fib_index_by_sw_if_index = is_ip4 ?
+					      ip4_main.fib_index_by_sw_if_index :
+					      ip6_main.fib_index_by_sw_if_index;
 
-  vec_validate_init_empty (urpf_cfgs[af][dir], sw_if_index, URPF_MODE_OFF);
+      fib_index = fib_index_by_sw_if_index[sw_if_index];
+    }
+  urpf_data_t old;
+  urpf_mode_t off = URPF_MODE_OFF;
+  urpf_data_t empty = { .fib_index = 0, .mode = off };
+  vec_validate_init_empty (urpf_cfgs[af][dir], sw_if_index, empty);
   old = urpf_cfgs[af][dir][sw_if_index];
 
-  if (mode != old)
+  urpf_data_t data = { .fib_index = fib_index,
+		       .mode = mode,
+		       .fib_index_is_custom = (table_id != ~0) };
+  urpf_cfgs[af][dir][sw_if_index] = data;
+  if (data.mode != old.mode || data.fib_index != old.fib_index)
     {
-      if (URPF_MODE_OFF != old)
+      if (URPF_MODE_OFF != old.mode)
 	/* disable what we have */
 	vnet_feature_enable_disable (urpf_feat_arcs[af][dir],
-				     urpf_feats[af][dir][old],
+				     urpf_feats[af][dir][old.mode],
 				     sw_if_index, 0, 0, 0);
 
-      if (URPF_MODE_OFF != mode)
+      if (URPF_MODE_OFF != data.mode)
 	/* enable what's new */
 	vnet_feature_enable_disable (urpf_feat_arcs[af][dir],
-				     urpf_feats[af][dir][mode],
+				     urpf_feats[af][dir][data.mode],
 				     sw_if_index, 1, 0, 0);
     }
   /* else - no change to existing config */
+  return 0;
+}
+
+static void
+urpf_table_bind_v4 (ip4_main_t *im, uword opaque, u32 sw_if_index,
+		    u32 new_fib_index, u32 old_fib_index)
+{
+  vlib_dir_t dir;
+  urpf_data_t empty = { .fib_index = 0, .mode = URPF_MODE_OFF };
+  FOREACH_VLIB_DIR (dir)
+  {
+    vec_validate_init_empty (urpf_cfgs[AF_IP4][dir], sw_if_index, empty);
+    if (!urpf_cfgs[AF_IP4][dir][sw_if_index].fib_index_is_custom)
+      {
+	urpf_cfgs[AF_IP4][dir][sw_if_index].fib_index = new_fib_index;
+      }
+  }
+}
 
-  urpf_cfgs[af][dir][sw_if_index] = mode;
+static void
+urpf_table_bind_v6 (ip6_main_t *im, uword opaque, u32 sw_if_index,
+		    u32 new_fib_index, u32 old_fib_index)
+{
+  vlib_dir_t dir;
+  urpf_data_t empty = { .fib_index = 0, .mode = URPF_MODE_OFF };
+  FOREACH_VLIB_DIR (dir)
+  {
+    vec_validate_init_empty (urpf_cfgs[AF_IP6][dir], sw_if_index, empty);
+    if (!urpf_cfgs[AF_IP6][dir][sw_if_index].fib_index_is_custom)
+      {
+	urpf_cfgs[AF_IP6][dir][sw_if_index].fib_index = new_fib_index;
+      }
+  }
 }
 
 static clib_error_t *
+urpf_init (vlib_main_t *vm)
+{
+  ip4_table_bind_callback_t cb4 = {
+    .function = urpf_table_bind_v4,
+  };
+  vec_add1 (ip4_main.table_bind_callbacks, cb4);
+
+  ip6_table_bind_callback_t cb6 = {
+    .function = urpf_table_bind_v6,
+  };
+  vec_add1 (ip6_main.table_bind_callbacks, cb6);
+  return (NULL);
+}
+
+VLIB_INIT_FUNCTION (urpf_init);
+
+static clib_error_t *
 urpf_cli_update (vlib_main_t * vm,
 		 unformat_input_t * input, vlib_cli_command_t * cmd)
 {
@@ -134,11 +206,13 @@ urpf_cli_update (vlib_main_t * vm,
   urpf_mode_t mode;
   u32 sw_if_index;
   vlib_dir_t dir;
+  u32 table_id;
 
   sw_if_index = ~0;
   af = AF_IP4;
   dir = VLIB_RX;
   mode = URPF_MODE_STRICT;
+  table_id = ~0;
 
   if (!unformat_user (input, unformat_line_input, line_input))
     return 0;
@@ -150,6 +224,8 @@ urpf_cli_update (vlib_main_t * vm,
 	;
       else if (unformat (line_input, "%U", unformat_urpf_mode, &mode))
 	;
+      else if (unformat (line_input, "table %d", &table_id))
+	;
       else if (unformat (line_input, "%U", unformat_ip_address_family, &af))
 	;
       else if (unformat (line_input, "%U", unformat_vlib_rx_tx, &dir))
@@ -168,7 +244,13 @@ urpf_cli_update (vlib_main_t * vm,
       goto done;
     }
 
-  urpf_update (mode, sw_if_index, af, dir);
+  int rv = 0;
+  rv = urpf_update (mode, sw_if_index, af, dir, table_id);
+  if (rv)
+    {
+      error = clib_error_return (0, "unknown table id");
+      goto done;
+    }
 done:
   unformat_free (line_input);
 
@@ -233,7 +315,8 @@ done:
 VLIB_CLI_COMMAND (set_interface_ip_source_check_command, static) = {
   .path = "set urpf",
   .function = urpf_cli_update,
-  .short_help = "set urpf [ip4|ip6] [rx|tx] [off|strict|loose] <INTERFACE>",
+  .short_help = "set urpf [ip4|ip6] [rx|tx] [off|strict|loose] "
+		"<INTERFACE> [table <table>]",
 };
 /* *INDENT-ON* */