wireguard: move adjacency processing from wireguard_peer to wireguard_interface

now we should add routes manually

Type: improvement
Change-Id: I877511a18854efdfad02939267d38a216b2ccec3
Signed-off-by: Artem Glazychev <artem.glazychev@xored.com>

7 files changed, 123 insertions, 233 deletions

diff --git a/src/plugins/wireguard/README.md b/src/plugins/wireguard/README.md
index df69d93789f..0b624b8104c 100755
--- a/src/plugins/wireguard/README.md
+++ b/src/plugins/wireguard/README.md
@@ -28,10 +28,15 @@ OpenSSL:
 
 ### Add a peer configuration:
 ```
-> vpp# wireguard peer add <wg_interface> public-key <pub_key_other> endpoint <ip4_dst> allowed-ip <prefix> dst-port <port_dst> persistent-keepalive [keepalive_interval]
+> vpp# wireguard peer add <wg_interface> public-key <pub_key_other> endpoint <ip4_dst> allowed-ip <prefix> port <port_dst> persistent-keepalive [keepalive_interval]
 > vpp# *peer_idx*
 ```
 
+### Add routes for allowed-ip:
+```
+> ip route add <prefix> via <wg_ip4> <wg_interface>
+```
+
 ### Show config
 ```
 > vpp# show wireguard interface
diff --git a/src/plugins/wireguard/wireguard_api.c b/src/plugins/wireguard/wireguard_api.c
index 36cc2509463..3f17f658869 100755..100644
--- a/src/plugins/wireguard/wireguard_api.c
+++ b/src/plugins/wireguard/wireguard_api.c
@@ -249,8 +249,7 @@ send_wg_peers_details (index_t peeri, void *data)
 
   int ii;
   for (ii = 0; ii < n_allowed_ips; ii++)
-    ip_prefix_encode (&peer->allowed_ips[ii].prefix,
-		      &rmp->peer.allowed_ips[ii]);
+    ip_prefix_encode (&peer->allowed_ips[ii], &rmp->peer.allowed_ips[ii]);
 
   rmp->context = ctx->context;
 
diff --git a/src/plugins/wireguard/wireguard_if.c b/src/plugins/wireguard/wireguard_if.c
index f7eb5a1d9e0..b1c5cb20638 100644
--- a/src/plugins/wireguard/wireguard_if.c
+++ b/src/plugins/wireguard/wireguard_if.c
@@ -151,7 +151,10 @@ wg_if_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
 void
 wg_if_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
 {
-  /* The peers manage the adjacencies */
+  index_t wgii;
+
+  wgii = wg_if_find_by_sw_if_index (sw_if_index);
+  wg_if_peer_walk (wg_if_get (wgii), wg_peer_if_adj_change, &ai);
 }
 
 
@@ -387,9 +390,8 @@ wg_if_peer_walk (wg_if_t * wgi, wg_if_peer_walk_cb_t fn, void *data)
   index_t peeri, val;
 
   /* *INDENT-OFF* */
-  hash_foreach (peeri, val, wgi->peers,
-  {
-    if (WALK_STOP == fn(wgi, peeri, data))
+  hash_foreach (peeri, val, wgi->peers, {
+    if (WALK_STOP == fn (peeri, data))
       return peeri;
   });
   /* *INDENT-ON* */
@@ -397,74 +399,6 @@ wg_if_peer_walk (wg_if_t * wgi, wg_if_peer_walk_cb_t fn, void *data)
   return INDEX_INVALID;
 }
 
-
-static void
-wg_if_table_bind_v4 (ip4_main_t * im,
-		     uword opaque,
-		     u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
-{
-  wg_if_t *wg_if;
-
-  wg_if = wg_if_get (wg_if_find_by_sw_if_index (sw_if_index));
-  if (NULL == wg_if)
-    return;
-
-  wg_peer_table_bind_ctx_t ctx = {
-    .af = AF_IP4,
-    .old_fib_index = old_fib_index,
-    .new_fib_index = new_fib_index,
-  };
-
-  wg_if_peer_walk (wg_if, wg_peer_if_table_change, &ctx);
-}
-
-static void
-wg_if_table_bind_v6 (ip6_main_t * im,
-		     uword opaque,
-		     u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
-{
-  wg_if_t *wg_if;
-
-  wg_if = wg_if_get (wg_if_find_by_sw_if_index (sw_if_index));
-  if (NULL == wg_if)
-    return;
-
-  wg_peer_table_bind_ctx_t ctx = {
-    .af = AF_IP6,
-    .old_fib_index = old_fib_index,
-    .new_fib_index = new_fib_index,
-  };
-
-  wg_if_peer_walk (wg_if, wg_peer_if_table_change, &ctx);
-}
-
-static clib_error_t *
-wg_if_module_init (vlib_main_t * vm)
-{
-  {
-    ip4_table_bind_callback_t cb = {
-      .function = wg_if_table_bind_v4,
-    };
-    vec_add1 (ip4_main.table_bind_callbacks, cb);
-  }
-  {
-    ip6_table_bind_callback_t cb = {
-      .function = wg_if_table_bind_v6,
-    };
-    vec_add1 (ip6_main.table_bind_callbacks, cb);
-  }
-
-  return (NULL);
-}
-
-/* *INDENT-OFF* */
-VLIB_INIT_FUNCTION (wg_if_module_init) =
-{
-  .runs_after = VLIB_INITS("ip_main_init"),
-};
-/* *INDENT-ON* */
-
-
 /*
  * fd.io coding-style-patch-verification: ON
  *
diff --git a/src/plugins/wireguard/wireguard_if.h b/src/plugins/wireguard/wireguard_if.h
index 7c11ad9b281..e43557b56fe 100644
--- a/src/plugins/wireguard/wireguard_if.h
+++ b/src/plugins/wireguard/wireguard_if.h
@@ -52,8 +52,7 @@ u8 *format_wg_if (u8 * s, va_list * va);
 typedef walk_rc_t (*wg_if_walk_cb_t) (index_t wgi, void *data);
 void wg_if_walk (wg_if_walk_cb_t fn, void *data);
 
-typedef walk_rc_t (*wg_if_peer_walk_cb_t) (wg_if_t * wgi, index_t peeri,
-					   void *data);
+typedef walk_rc_t (*wg_if_peer_walk_cb_t) (index_t peeri, void *data);
 index_t wg_if_peer_walk (wg_if_t * wgi, wg_if_peer_walk_cb_t fn, void *data);
 
 void wg_if_peer_add (wg_if_t * wgi, index_t peeri);
diff --git a/src/plugins/wireguard/wireguard_input.c b/src/plugins/wireguard/wireguard_input.c
index 5db814292f8..8dfba7615ef 100644
--- a/src/plugins/wireguard/wireguard_input.c
+++ b/src/plugins/wireguard/wireguard_input.c
@@ -254,24 +254,6 @@ wg_handshake_process (vlib_main_t * vm, wg_main_t * wmp, vlib_buffer_t * b)
   return WG_INPUT_ERROR_NONE;
 }
 
-static_always_inline bool
-fib_prefix_is_cover_addr_4 (const fib_prefix_t * p1,
-			    const ip4_address_t * ip4)
-{
-  switch (p1->fp_proto)
-    {
-    case FIB_PROTOCOL_IP4:
-      return (ip4_destination_matches_route (&ip4_main,
-					     &p1->fp_addr.ip4,
-					     ip4, p1->fp_len) != 0);
-    case FIB_PROTOCOL_IP6:
-      return (false);
-    case FIB_PROTOCOL_MPLS:
-      break;
-    }
-  return (false);
-}
-
 VLIB_NODE_FN (wg_input_node) (vlib_main_t * vm,
 			      vlib_node_runtime_t * node,
 			      vlib_frame_t * frame)
@@ -386,7 +368,7 @@ VLIB_NODE_FN (wg_input_node) (vlib_main_t * vm,
 
 	  ip4_header_t *iph = vlib_buffer_get_current (b[0]);
 
-	  const wg_peer_allowed_ip_t *allowed_ip;
+	  const fib_prefix_t *allowed_ip;
 	  bool allowed = false;
 
 	  /*
@@ -396,8 +378,7 @@ VLIB_NODE_FN (wg_input_node) (vlib_main_t * vm,
 	   */
 	  vec_foreach (allowed_ip, peer->allowed_ips)
 	  {
-	    if (fib_prefix_is_cover_addr_4 (&allowed_ip->prefix,
-					    &iph->src_address))
+	    if (fib_prefix_is_cover_addr_4 (allowed_ip, &iph->src_address))
 	      {
 		allowed = true;
 		break;
diff --git a/src/plugins/wireguard/wireguard_peer.c b/src/plugins/wireguard/wireguard_peer.c
index 0c93a25f4d7..5e2011b401e 100644
--- a/src/plugins/wireguard/wireguard_peer.c
+++ b/src/plugins/wireguard/wireguard_peer.c
@@ -23,7 +23,6 @@
 #include <wireguard/wireguard_send.h>
 #include <wireguard/wireguard.h>
 
-static fib_source_t wg_fib_source;
 wg_peer_t *wg_peer_pool;
 
 index_t *wg_peer_by_adj_index;
@@ -36,45 +35,14 @@ wg_peer_endpoint_reset (wg_peer_endpoint_t * ep)
 }
 
 static void
-wg_peer_endpoint_init (wg_peer_endpoint_t * ep,
-		       const ip46_address_t * addr, u16 port)
+wg_peer_endpoint_init (wg_peer_endpoint_t *ep, const ip46_address_t *addr,
+		       u16 port)
 {
   ip46_address_copy (&ep->addr, addr);
   ep->port = port;
 }
 
 static void
-wg_peer_fib_flush (wg_peer_t * peer)
-{
-  wg_peer_allowed_ip_t *allowed_ip;
-
-  vec_foreach (allowed_ip, peer->allowed_ips)
-  {
-    fib_table_entry_delete_index (allowed_ip->fib_entry_index, wg_fib_source);
-    allowed_ip->fib_entry_index = FIB_NODE_INDEX_INVALID;
-  }
-}
-
-static void
-wg_peer_fib_populate (wg_peer_t * peer, u32 fib_index)
-{
-  wg_peer_allowed_ip_t *allowed_ip;
-
-  vec_foreach (allowed_ip, peer->allowed_ips)
-  {
-    allowed_ip->fib_entry_index =
-      fib_table_entry_path_add (fib_index,
-				&allowed_ip->prefix,
-				wg_fib_source,
-				FIB_ENTRY_FLAG_NONE,
-				fib_proto_to_dpo (allowed_ip->
-						  prefix.fp_proto),
-				&peer->dst.addr, peer->wg_sw_if_index, ~0, 1,
-				NULL, FIB_ROUTE_PATH_FLAG_NONE);
-  }
-}
-
-static void
 wg_peer_clear (vlib_main_t * vm, wg_peer_t * peer)
 {
   wg_timers_stop (peer);
@@ -91,16 +59,16 @@ wg_peer_clear (vlib_main_t * vm, wg_peer_t * peer)
   wg_peer_endpoint_reset (&peer->src);
   wg_peer_endpoint_reset (&peer->dst);
 
-  if (INDEX_INVALID != peer->adj_index)
+  adj_index_t *adj_index;
+  vec_foreach (adj_index, peer->adj_indices)
     {
-      adj_unlock (peer->adj_index);
-      wg_peer_by_adj_index[peer->adj_index] = INDEX_INVALID;
+      if (INDEX_INVALID != *adj_index)
+	{
+	  wg_peer_by_adj_index[*adj_index] = INDEX_INVALID;
+	}
     }
-  wg_peer_fib_flush (peer);
-
   peer->input_thread_index = ~0;
   peer->output_thread_index = ~0;
-  peer->adj_index = INDEX_INVALID;
   peer->timer_wheel = 0;
   peer->persistent_keepalive_interval = 0;
   peer->timer_handshake_attempts = 0;
@@ -113,12 +81,12 @@ wg_peer_clear (vlib_main_t * vm, wg_peer_t * peer)
   peer->timer_need_another_keepalive = false;
   peer->is_dead = true;
   vec_free (peer->allowed_ips);
+  vec_free (peer->adj_indices);
 }
 
 static void
 wg_peer_init (vlib_main_t * vm, wg_peer_t * peer)
 {
-  peer->adj_index = INDEX_INVALID;
   wg_peer_clear (vm, peer);
 }
 
@@ -147,13 +115,16 @@ wg_peer_build_rewrite (const wg_peer_t * peer)
 }
 
 static void
-wg_peer_adj_stack (wg_peer_t * peer)
+wg_peer_adj_stack (wg_peer_t *peer, adj_index_t ai)
 {
   ip_adjacency_t *adj;
   u32 sw_if_index;
   wg_if_t *wgi;
 
-  adj = adj_get (peer->adj_index);
+  if (!adj_is_valid (ai))
+    return;
+
+  adj = adj_get (ai);
   sw_if_index = adj->rewrite_header.sw_if_index;
 
   wgi = wg_if_get (wg_if_find_by_sw_if_index (sw_if_index));
@@ -163,7 +134,7 @@ wg_peer_adj_stack (wg_peer_t * peer)
 
   if (!vnet_sw_interface_is_admin_up (vnet_get_main (), wgi->sw_if_index))
     {
-      adj_midchain_delegate_unstack (peer->adj_index);
+      adj_midchain_delegate_unstack (ai);
     }
   else
     {
@@ -178,39 +149,69 @@ wg_peer_adj_stack (wg_peer_t * peer)
 
       fib_index = fib_table_find (FIB_PROTOCOL_IP4, peer->table_id);
 
-      adj_midchain_delegate_stack (peer->adj_index, fib_index, &dst);
+      adj_midchain_delegate_stack (ai, fib_index, &dst);
     }
 }
 
 walk_rc_t
-wg_peer_if_admin_state_change (wg_if_t * wgi, index_t peeri, void *data)
+wg_peer_if_admin_state_change (index_t peeri, void *data)
 {
-  wg_peer_adj_stack (wg_peer_get (peeri));
-
+  wg_peer_t *peer;
+  adj_index_t *adj_index;
+  peer = wg_peer_get (peeri);
+  vec_foreach (adj_index, peer->adj_indices)
+    {
+      wg_peer_adj_stack (peer, *adj_index);
+    }
   return (WALK_CONTINUE);
 }
 
 walk_rc_t
-wg_peer_if_table_change (wg_if_t * wgi, index_t peeri, void *data)
+wg_peer_if_adj_change (index_t peeri, void *data)
 {
-  wg_peer_table_bind_ctx_t *ctx = data;
+  adj_index_t *adj_index = data;
+  ip_adjacency_t *adj;
   wg_peer_t *peer;
+  fib_prefix_t *allowed_ip;
 
-  peer = wg_peer_get (peeri);
+  adj = adj_get (*adj_index);
 
-  wg_peer_fib_flush (peer);
-  wg_peer_fib_populate (peer, ctx->new_fib_index);
+  peer = wg_peer_get (peeri);
+  vec_foreach (allowed_ip, peer->allowed_ips)
+    {
+      if (fib_prefix_is_cover_addr_4 (allowed_ip,
+				      &adj->sub_type.nbr.next_hop.ip4))
+	{
+	  vec_add1 (peer->adj_indices, *adj_index);
+	  vec_validate_init_empty (wg_peer_by_adj_index, *adj_index,
+				   INDEX_INVALID);
+	  wg_peer_by_adj_index[*adj_index] = peer - wg_peer_pool;
+
+	  adj_nbr_midchain_update_rewrite (*adj_index, NULL, NULL,
+					   ADJ_FLAG_MIDCHAIN_IP_STACK,
+					   vec_dup (peer->rewrite));
+
+	  wg_peer_adj_stack (peer, *adj_index);
+	  return (WALK_STOP);
+	}
+    }
 
   return (WALK_CONTINUE);
 }
 
+adj_walk_rc_t
+wg_peer_adj_walk (adj_index_t ai, void *data)
+{
+  return wg_peer_if_adj_change ((*(index_t *) (data)), &ai) == WALK_CONTINUE ?
+	   ADJ_WALK_RC_CONTINUE :
+	   ADJ_WALK_RC_STOP;
+}
+
 static int
-wg_peer_fill (vlib_main_t * vm, wg_peer_t * peer,
-	      u32 table_id,
-	      const ip46_address_t * dst,
-	      u16 port,
+wg_peer_fill (vlib_main_t *vm, wg_peer_t *peer, u32 table_id,
+	      const ip46_address_t *dst, u16 port,
 	      u16 persistent_keepalive_interval,
-	      const fib_prefix_t * allowed_ips, u32 wg_sw_if_index)
+	      const fib_prefix_t *allowed_ips, u32 wg_sw_if_index)
 {
   wg_peer_endpoint_init (&peer->dst, dst, port);
 
@@ -228,54 +229,29 @@ wg_peer_fill (vlib_main_t * vm, wg_peer_t * peer,
 
   ip_address_to_46 (&wgi->src_ip, &peer->src.addr);
   peer->src.port = wgi->port;
-
-  /*
-   * and an adjacency for the endpoint address in the overlay
-   * on the wg interface
-   */
   peer->rewrite = wg_peer_build_rewrite (peer);
 
-  peer->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
-					 VNET_LINK_IP4,
-					 &peer->dst.addr, wgi->sw_if_index);
-
-  vec_validate_init_empty (wg_peer_by_adj_index,
-			   peer->adj_index, INDEX_INVALID);
-  wg_peer_by_adj_index[peer->adj_index] = peer - wg_peer_pool;
-
-  adj_nbr_midchain_update_rewrite (peer->adj_index,
-				   NULL,
-				   NULL,
-				   ADJ_FLAG_MIDCHAIN_IP_STACK,
-				   vec_dup (peer->rewrite));
-  wg_peer_adj_stack (peer);
-
-  /*
-   * add a route in the overlay to each of the allowed-ips
-   */
   u32 ii;
-
   vec_validate (peer->allowed_ips, vec_len (allowed_ips) - 1);
-
   vec_foreach_index (ii, allowed_ips)
   {
-    peer->allowed_ips[ii].prefix = allowed_ips[ii];
+    peer->allowed_ips[ii] = allowed_ips[ii];
   }
 
-  wg_peer_fib_populate (peer,
-			fib_table_get_index_for_sw_if_index
-			(FIB_PROTOCOL_IP4, peer->wg_sw_if_index));
-
+  index_t perri = peer - wg_peer_pool;
+  fib_protocol_t proto;
+  FOR_EACH_FIB_IP_PROTOCOL (proto)
+  {
+    adj_nbr_walk (wg_sw_if_index, proto, wg_peer_adj_walk, &perri);
+  }
   return (0);
 }
 
 int
-wg_peer_add (u32 tun_sw_if_index,
-	     const u8 public_key[NOISE_PUBLIC_KEY_LEN],
-	     u32 table_id,
-	     const ip46_address_t * endpoint,
-	     const fib_prefix_t * allowed_ips,
-	     u16 port, u16 persistent_keepalive, u32 * peer_index)
+wg_peer_add (u32 tun_sw_if_index, const u8 public_key[NOISE_PUBLIC_KEY_LEN],
+	     u32 table_id, const ip46_address_t *endpoint,
+	     const fib_prefix_t *allowed_ips, u16 port,
+	     u16 persistent_keepalive, u32 *peer_index)
 {
   wg_if_t *wg_if;
   wg_peer_t *peer;
@@ -374,8 +350,8 @@ format_wg_peer_endpoint (u8 * s, va_list * args)
 {
   wg_peer_endpoint_t *ep = va_arg (*args, wg_peer_endpoint_t *);
 
-  s = format (s, "%U:%d",
-	      format_ip46_address, &ep->addr, IP46_TYPE_ANY, ep->port);
+  s = format (s, "%U:%d", format_ip46_address, &ep->addr, IP46_TYPE_ANY,
+	      ep->port);
 
   return (s);
 }
@@ -384,48 +360,34 @@ u8 *
 format_wg_peer (u8 * s, va_list * va)
 {
   index_t peeri = va_arg (*va, index_t);
-  wg_peer_allowed_ip_t *allowed_ip;
+  fib_prefix_t *allowed_ip;
+  adj_index_t *adj_index;
   u8 key[NOISE_KEY_LEN_BASE64];
   wg_peer_t *peer;
 
   peer = wg_peer_get (peeri);
   key_to_base64 (peer->remote.r_public, NOISE_PUBLIC_KEY_LEN, key);
 
-  s = format (s, "[%d] endpoint:[%U->%U] %U keep-alive:%d adj:%d",
-	      peeri,
-	      format_wg_peer_endpoint, &peer->src,
-	      format_wg_peer_endpoint, &peer->dst,
-	      format_vnet_sw_if_index_name, vnet_get_main (),
-	      peer->wg_sw_if_index,
-	      peer->persistent_keepalive_interval, peer->adj_index);
-  s = format (s, "\n  key:%=s %U",
-	      key, format_hex_bytes, peer->remote.r_public,
-	      NOISE_PUBLIC_KEY_LEN);
+  s = format (s, "[%d] endpoint:[%U->%U] %U keep-alive:%d", peeri,
+	      format_wg_peer_endpoint, &peer->src, format_wg_peer_endpoint,
+	      &peer->dst, format_vnet_sw_if_index_name, vnet_get_main (),
+	      peer->wg_sw_if_index, peer->persistent_keepalive_interval);
+  s = format (s, "\n  adj:");
+  vec_foreach (adj_index, peer->adj_indices)
+    {
+      s = format (s, " %d", adj_index);
+    }
+  s = format (s, "\n  key:%=s %U", key, format_hex_bytes,
+	      peer->remote.r_public, NOISE_PUBLIC_KEY_LEN);
   s = format (s, "\n  allowed-ips:");
   vec_foreach (allowed_ip, peer->allowed_ips)
   {
-    s = format (s, " %U", format_fib_prefix, &allowed_ip->prefix);
+    s = format (s, " %U", format_fib_prefix, allowed_ip);
   }
 
   return s;
 }
 
-static clib_error_t *
-wg_peer_module_init (vlib_main_t * vm)
-{
-  /*
-   * use a priority better than interface source, so that
-   * if the same subnet is added to the wg interface and is
-   * used as an allowed IP, then the wireguard soueced prefix
-   * wins and traffic is routed to the endpoint rather than dropped
-   */
-  wg_fib_source = fib_source_allocate ("wireguard", 0x2, FIB_SOURCE_BH_API);
-
-  return (NULL);
-}
-
-VLIB_INIT_FUNCTION (wg_peer_module_init);
-
 /*
  * fd.io coding-style-patch-verification: ON
  *
diff --git a/src/plugins/wireguard/wireguard_peer.h b/src/plugins/wireguard/wireguard_peer.h
index b60c669ac0f..cf859f32b1f 100644
--- a/src/plugins/wireguard/wireguard_peer.h
+++ b/src/plugins/wireguard/wireguard_peer.h
@@ -33,12 +33,6 @@ typedef struct ip4_udp_header_t_
 
 u8 *format_ip4_udp_header (u8 * s, va_list * va);
 
-typedef struct wg_peer_allowed_ip_t_
-{
-  fib_prefix_t prefix;
-  fib_node_index_t fib_entry_index;
-} wg_peer_allowed_ip_t;
-
 typedef struct wg_peer_endpoint_t_
 {
   ip46_address_t addr;
@@ -57,13 +51,13 @@ typedef struct wg_peer
   wg_peer_endpoint_t dst;
   wg_peer_endpoint_t src;
   u32 table_id;
-  adj_index_t adj_index;
+  adj_index_t *adj_indices;
 
   /* rewrite built from address information */
   u8 *rewrite;
 
   /* Vector of allowed-ips */
-  wg_peer_allowed_ip_t *allowed_ips;
+  fib_prefix_t *allowed_ips;
 
   /* The WG interface this peer is attached to */
   u32 wg_sw_if_index;
@@ -111,9 +105,9 @@ index_t wg_peer_walk (wg_peer_walk_cb_t fn, void *data);
 
 u8 *format_wg_peer (u8 * s, va_list * va);
 
-walk_rc_t wg_peer_if_admin_state_change (wg_if_t * wgi, index_t peeri,
-					 void *data);
-walk_rc_t wg_peer_if_table_change (wg_if_t * wgi, index_t peeri, void *data);
+walk_rc_t wg_peer_if_admin_state_change (index_t peeri, void *data);
+walk_rc_t wg_peer_if_adj_change (index_t peeri, void *data);
+adj_walk_rc_t wg_peer_adj_walk (adj_index_t ai, void *data);
 
 /*
  * Expoed for the data-plane
@@ -145,6 +139,22 @@ wg_peer_assign_thread (u32 thread_id)
 	      1) : thread_id));
 }
 
+static_always_inline bool
+fib_prefix_is_cover_addr_4 (const fib_prefix_t *p1, const ip4_address_t *ip4)
+{
+  switch (p1->fp_proto)
+    {
+    case FIB_PROTOCOL_IP4:
+      return (ip4_destination_matches_route (&ip4_main, &p1->fp_addr.ip4, ip4,
+					     p1->fp_len) != 0);
+    case FIB_PROTOCOL_IP6:
+      return (false);
+    case FIB_PROTOCOL_MPLS:
+      break;
+    }
+  return (false);
+}
+
 #endif // __included_wg_peer_h__
 
 /*