X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fudp%2Fudp.c;h=99fa2aa00d081267d85b4c3bb5169b0eaac0d03f;hb=256779c85725c75de185f5cba9a4ec0c59b3151c;hp=888a6cb844b889bd2fc51c810c2613ed62e57cee;hpb=40903ac34f89d9e2ad775e98b7bcec5b7feb0207;p=vpp.git

diff --git a/src/vnet/udp/udp.c b/src/vnet/udp/udp.c
index 888a6cb844b..99fa2aa00d0 100644
--- a/src/vnet/udp/udp.c
+++ b/src/vnet/udp/udp.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Copyright (c) 2016-2020 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
@@ -13,14 +13,80 @@
  * limitations under the License.
  */
 
-/** @file
-    udp state machine, etc.
-*/
-
 #include <vnet/udp/udp.h>
 #include <vnet/session/session.h>
 #include <vnet/dpo/load_balance.h>
 #include <vnet/fib/ip4_fib.h>
+#include <vppinfra/sparse_vec.h>
+
+udp_main_t udp_main;
+
+static void
+udp_connection_register_port (vlib_main_t * vm, u16 lcl_port, u8 is_ip4)
+{
+  udp_main_t *um = &udp_main;
+  udp_dst_port_info_t *pi;
+  u16 *n;
+
+  pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
+  if (!pi)
+    {
+      udp_add_dst_port (um, lcl_port, 0, is_ip4);
+      pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
+      pi->n_connections = 1;
+    }
+  else
+    {
+      pi->n_connections += 1;
+      /* Do not return. The fact that the pi is valid does not mean
+       * it's up to date */
+    }
+
+  pi->node_index = is_ip4 ? udp4_input_node.index : udp6_input_node.index;
+  pi->next_index = um->local_to_input_edge[is_ip4];
+
+  /* Setup udp protocol -> next index sparse vector mapping. */
+  if (is_ip4)
+    n = sparse_vec_validate (um->next_by_dst_port4,
+			     clib_host_to_net_u16 (lcl_port));
+  else
+    n = sparse_vec_validate (um->next_by_dst_port6,
+			     clib_host_to_net_u16 (lcl_port));
+
+  n[0] = pi->next_index;
+}
+
+static void
+udp_connection_unregister_port (u16 lcl_port, u8 is_ip4)
+{
+  udp_main_t *um = &udp_main;
+  udp_dst_port_info_t *pi;
+
+  pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
+  if (!pi)
+    return;
+
+  if (!pi->n_connections)
+    {
+      clib_warning ("no connections using port %u", lcl_port);
+      return;
+    }
+
+  if (!clib_atomic_sub_fetch (&pi->n_connections, 1))
+    udp_unregister_dst_port (0, lcl_port, is_ip4);
+}
+
+void
+udp_connection_share_port (u16 lcl_port, u8 is_ip4)
+{
+  udp_main_t *um = &udp_main;
+  udp_dst_port_info_t *pi;
+
+  /* Done without a lock but the operation is atomic. Writers to pi hash
+   * table and vector should be guarded by a barrier sync */
+  pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
+  clib_atomic_fetch_add_rel (&pi->n_connections, 1);
+}
 
 udp_connection_t *
 udp_connection_alloc (u32 thread_index)
@@ -45,7 +111,7 @@ udp_connection_alloc (u32 thread_index)
       pool_get_aligned (um->connections[thread_index], uc,
 			CLIB_CACHE_LINE_BYTES);
     }
-  memset (uc, 0, sizeof (*uc));
+  clib_memset (uc, 0, sizeof (*uc));
   uc->c_c_index = uc - um->connections[thread_index];
   uc->c_thread_index = thread_index;
   uc->c_proto = TRANSPORT_PROTO_UDP;
@@ -56,27 +122,67 @@ udp_connection_alloc (u32 thread_index)
 void
 udp_connection_free (udp_connection_t * uc)
 {
-  pool_put (udp_main.connections[uc->c_thread_index], uc);
+  u32 thread_index = uc->c_thread_index;
   if (CLIB_DEBUG)
-    memset (uc, 0xFA, sizeof (*uc));
+    clib_memset (uc, 0xFA, sizeof (*uc));
+  pool_put (udp_main.connections[thread_index], uc);
+}
+
+static void
+udp_connection_cleanup (udp_connection_t * uc)
+{
+  transport_endpoint_cleanup (TRANSPORT_PROTO_UDP, &uc->c_lcl_ip,
+			      uc->c_lcl_port);
+  udp_connection_unregister_port (clib_net_to_host_u16 (uc->c_lcl_port),
+				  uc->c_is_ip4);
+  udp_connection_free (uc);
+}
+
+void
+udp_connection_delete (udp_connection_t * uc)
+{
+  session_transport_delete_notify (&uc->connection);
+  udp_connection_cleanup (uc);
 }
 
-u32
+static u8
+udp_connection_port_used_extern (u16 lcl_port, u8 is_ip4)
+{
+  udp_main_t *um = vnet_get_udp_main ();
+  udp_dst_port_info_t *pi;
+
+  pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
+  return (pi && !pi->n_connections
+	  && udp_is_valid_dst_port (lcl_port, is_ip4));
+}
+
+static u16
+udp_default_mtu (udp_main_t * um, u8 is_ip4)
+{
+  u16 ip_hlen = is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
+  return (um->default_mtu - sizeof (udp_header_t) - ip_hlen);
+}
+
+static u32
 udp_session_bind (u32 session_index, transport_endpoint_t * lcl)
 {
   udp_main_t *um = vnet_get_udp_main ();
   vlib_main_t *vm = vlib_get_main ();
+  transport_endpoint_cfg_t *lcl_ext;
   udp_connection_t *listener;
-  u32 node_index;
+  u16 lcl_port_ho;
   void *iface_ip;
-  udp_dst_port_info_t *pi;
 
-  pi = udp_get_dst_port_info (um, lcl->port, lcl->is_ip4);
-  if (pi)
-    return -1;
+  lcl_port_ho = clib_net_to_host_u16 (lcl->port);
+
+  if (udp_connection_port_used_extern (lcl_port_ho, lcl->is_ip4))
+    {
+      clib_warning ("port already used");
+      return SESSION_E_PORTINUSE;
+    }
 
   pool_get (um->listener_pool, listener);
-  memset (listener, 0, sizeof (udp_connection_t));
+  clib_memset (listener, 0, sizeof (udp_connection_t));
 
   listener->c_lcl_port = lcl->port;
   listener->c_c_index = listener - um->listener_pool;
@@ -93,27 +199,33 @@ udp_session_bind (u32 session_index, transport_endpoint_t * lcl)
   listener->c_proto = TRANSPORT_PROTO_UDP;
   listener->c_s_index = session_index;
   listener->c_fib_index = lcl->fib_index;
+  listener->mss = udp_default_mtu (um, listener->c_is_ip4);
+  listener->flags |= UDP_CONN_F_OWNS_PORT | UDP_CONN_F_LISTEN;
+  lcl_ext = (transport_endpoint_cfg_t *) lcl;
+  if (lcl_ext->transport_flags & TRANSPORT_CFG_F_CONNECTED)
+    listener->flags |= UDP_CONN_F_CONNECTED;
+  else
+    listener->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
   clib_spinlock_init (&listener->rx_lock);
 
-  node_index = lcl->is_ip4 ? udp4_input_node.index : udp6_input_node.index;
-  udp_register_dst_port (vm, clib_net_to_host_u16 (lcl->port), node_index,
-			 1 /* is_ipv4 */ );
+  udp_connection_register_port (vm, lcl_port_ho, lcl->is_ip4);
   return listener->c_c_index;
 }
 
-u32
+static u32
 udp_session_unbind (u32 listener_index)
 {
-  vlib_main_t *vm = vlib_get_main ();
-
+  udp_main_t *um = &udp_main;
   udp_connection_t *listener;
+
   listener = udp_listener_get (listener_index);
-  udp_unregister_dst_port (vm, clib_net_to_host_u16 (listener->c_lcl_port),
-			   listener->c_is_ip4);
+  udp_connection_unregister_port (clib_net_to_host_u16 (listener->c_lcl_port),
+				  listener->c_is_ip4);
+  pool_put (um->listener_pool, listener);
   return 0;
 }
 
-transport_connection_t *
+static transport_connection_t *
 udp_session_get_listener (u32 listener_index)
 {
   udp_connection_t *us;
@@ -122,33 +234,36 @@ udp_session_get_listener (u32 listener_index)
   return &us->connection;
 }
 
-u32
+static u32
 udp_push_header (transport_connection_t * tc, vlib_buffer_t * b)
 {
   udp_connection_t *uc;
   vlib_main_t *vm = vlib_get_main ();
 
-  uc = udp_get_connection_from_transport (tc);
+  uc = udp_connection_from_transport (tc);
 
   vlib_buffer_push_udp (b, uc->c_lcl_port, uc->c_rmt_port, 1);
   if (tc->is_ip4)
-    vlib_buffer_push_ip4 (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
-			  IP_PROTOCOL_UDP, 1);
+    vlib_buffer_push_ip4_custom (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
+				 IP_PROTOCOL_UDP, 1 /* csum offload */ ,
+				 0 /* is_df */ );
   else
-    {
-      ip6_header_t *ih;
-      ih = vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
-				 IP_PROTOCOL_UDP);
-      vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
-    }
+    vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
+			  IP_PROTOCOL_UDP);
   vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
   vnet_buffer (b)->sw_if_index[VLIB_TX] = uc->c_fib_index;
   b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
 
+  if (PREDICT_FALSE (uc->flags & UDP_CONN_F_CLOSING))
+    {
+      if (!transport_max_tx_dequeue (&uc->connection))
+	udp_connection_delete (uc);
+    }
+
   return 0;
 }
 
-transport_connection_t *
+static transport_connection_t *
 udp_session_get (u32 connection_index, u32 thread_index)
 {
   udp_connection_t *uc;
@@ -158,135 +273,104 @@ udp_session_get (u32 connection_index, u32 thread_index)
   return 0;
 }
 
-void
+static void
 udp_session_close (u32 connection_index, u32 thread_index)
 {
-  vlib_main_t *vm = vlib_get_main ();
   udp_connection_t *uc;
+
   uc = udp_connection_get (connection_index, thread_index);
-  if (uc)
-    {
-      udp_unregister_dst_port (vm, clib_net_to_host_u16 (uc->c_lcl_port),
-			       uc->c_is_ip4);
-      stream_session_delete_notify (&uc->connection);
-      udp_connection_free (uc);
-    }
+  if (!uc)
+    return;
+
+  if (!transport_max_tx_dequeue (&uc->connection))
+    udp_connection_delete (uc);
+  else
+    uc->flags |= UDP_CONN_F_CLOSING;
 }
 
-void
+static void
 udp_session_cleanup (u32 connection_index, u32 thread_index)
 {
   udp_connection_t *uc;
   uc = udp_connection_get (connection_index, thread_index);
-  if (uc)
-    udp_connection_free (uc);
-}
-
-u8 *
-format_udp_connection_id (u8 * s, va_list * args)
-{
-  udp_connection_t *uc = va_arg (*args, udp_connection_t *);
   if (!uc)
-    return s;
-  if (uc->c_is_ip4)
-    s = format (s, "[#%d][%s] %U:%d->%U:%d", uc->c_thread_index, "U",
-		format_ip4_address, &uc->c_lcl_ip4,
-		clib_net_to_host_u16 (uc->c_lcl_port), format_ip4_address,
-		&uc->c_rmt_ip4, clib_net_to_host_u16 (uc->c_rmt_port));
+    return;
+  if (uc->flags & UDP_CONN_F_MIGRATED)
+    udp_connection_free (uc);
   else
-    s = format (s, "[#%d][%s] %U:%d->%U:%d", uc->c_thread_index, "U",
-		format_ip6_address, &uc->c_lcl_ip6,
-		clib_net_to_host_u16 (uc->c_lcl_port), format_ip6_address,
-		&uc->c_rmt_ip6, clib_net_to_host_u16 (uc->c_rmt_port));
-  return s;
-}
-
-u8 *
-format_udp_connection (u8 * s, va_list * args)
-{
-  udp_connection_t *uc = va_arg (*args, udp_connection_t *);
-  u32 verbose = va_arg (*args, u32);
-  if (!uc)
-    return s;
-  s = format (s, "%-50U", format_udp_connection_id, uc);
-  if (verbose)
-    {
-      if (verbose == 1)
-	s = format (s, "%-15s\n", "-");
-      else
-	s = format (s, "\n");
-    }
-  return s;
+    udp_connection_cleanup (uc);
 }
 
-u8 *
-format_udp_session (u8 * s, va_list * args)
+static int
+udp_session_send_params (transport_connection_t * tconn,
+			 transport_send_params_t * sp)
 {
-  u32 uci = va_arg (*args, u32);
-  u32 thread_index = va_arg (*args, u32);
-  u32 verbose = va_arg (*args, u32);
   udp_connection_t *uc;
 
-  uc = udp_connection_get (uci, thread_index);
-  return format (s, "%U", format_udp_connection, uc, verbose);
-}
-
-u8 *
-format_udp_half_open_session (u8 * s, va_list * args)
-{
-  clib_warning ("BUG");
-  return 0;
-}
+  uc = udp_connection_from_transport (tconn);
 
-u8 *
-format_udp_listener_session (u8 * s, va_list * args)
-{
-  u32 tci = va_arg (*args, u32);
-  udp_connection_t *uc = udp_listener_get (tci);
-  return format (s, "%U", format_udp_connection, uc);
-}
-
-u16
-udp_send_mss (transport_connection_t * t)
-{
-  /* TODO figure out MTU of output interface */
-  return 1460;
-}
-
-u32
-udp_send_space (transport_connection_t * t)
-{
   /* No constraint on TX window */
-  return ~0;
+  sp->snd_space = ~0;
+  /* TODO figure out MTU of output interface */
+  sp->snd_mss = uc->mss;
+  sp->tx_offset = 0;
+  sp->flags = 0;
+  return 0;
 }
 
-int
-udp_open_connection (transport_endpoint_t * rmt)
+static int
+udp_open_connection (transport_endpoint_cfg_t * rmt)
 {
-  udp_main_t *um = vnet_get_udp_main ();
   vlib_main_t *vm = vlib_get_main ();
-  u32 thread_index = vlib_get_thread_index ();
-  udp_connection_t *uc;
+  u32 thread_index = vm->thread_index;
+  udp_main_t *um = &udp_main;
   ip46_address_t lcl_addr;
-  u32 node_index;
+  udp_connection_t *uc;
   u16 lcl_port;
+  int rv;
 
-  if (transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
-				      &lcl_port))
-    return -1;
+  rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
+				       &lcl_port);
+  if (rv)
+    {
+      if (rv != SESSION_E_PORTINUSE)
+	return rv;
+
+      if (udp_connection_port_used_extern (lcl_port, rmt->is_ip4))
+	return SESSION_E_PORTINUSE;
+
+      /* If port in use, check if 5-tuple is also in use */
+      if (session_lookup_connection (rmt->fib_index, &lcl_addr, &rmt->ip,
+				     lcl_port, rmt->port, TRANSPORT_PROTO_UDP,
+				     rmt->is_ip4))
+	return SESSION_E_PORTINUSE;
+
+      /* 5-tuple is available so increase lcl endpoint refcount and proceed
+       * with connection allocation */
+      transport_share_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr,
+				      lcl_port);
+      goto conn_alloc;
+    }
 
-  while (udp_get_dst_port_info (um, lcl_port, rmt->is_ip4))
+  if (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
     {
-      lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP, &lcl_addr);
-      if (lcl_port < 1)
+      /* If specific source port was requested abort */
+      if (rmt->peer.port)
+	return SESSION_E_PORTINUSE;
+
+      /* Try to find a port that's not used */
+      while (udp_is_valid_dst_port (lcl_port, rmt->is_ip4))
 	{
-	  clib_warning ("Failed to allocate src port");
-	  return -1;
+	  lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP,
+						 &lcl_addr);
+	  if (lcl_port < 1)
+	    return SESSION_E_PORTINUSE;
 	}
     }
 
-  node_index = rmt->is_ip4 ? udp4_input_node.index : udp6_input_node.index;
-  udp_register_dst_port (vm, lcl_port, node_index, 1 /* is_ipv4 */ );
+conn_alloc:
+
+  udp_connection_register_port (vm, lcl_port, rmt->is_ip4);
 
   /* We don't poll main thread if we have workers */
   if (vlib_num_workers ())
@@ -300,11 +384,17 @@ udp_open_connection (transport_endpoint_t * rmt)
   uc->c_is_ip4 = rmt->is_ip4;
   uc->c_proto = TRANSPORT_PROTO_UDP;
   uc->c_fib_index = rmt->fib_index;
+  uc->mss = rmt->mss ? rmt->mss : udp_default_mtu (um, uc->c_is_ip4);
+  uc->flags |= UDP_CONN_F_OWNS_PORT;
+  if (rmt->transport_flags & TRANSPORT_CFG_F_CONNECTED)
+    uc->flags |= UDP_CONN_F_CONNECTED;
+  else
+    uc->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
 
   return uc->c_c_index;
 }
 
-transport_connection_t *
+static transport_connection_t *
 udp_session_get_half_open (u32 conn_index)
 {
   udp_connection_t *uc;
@@ -313,71 +403,63 @@ udp_session_get_half_open (u32 conn_index)
   /* We don't poll main thread if we have workers */
   thread_index = vlib_num_workers ()? 1 : 0;
   uc = udp_connection_get (conn_index, thread_index);
+  if (!uc)
+    return 0;
   return &uc->connection;
 }
 
-/* *INDENT-OFF* */
-const static transport_proto_vft_t udp_proto = {
-  .bind = udp_session_bind,
-  .open = udp_open_connection,
-  .unbind = udp_session_unbind,
-  .push_header = udp_push_header,
-  .get_connection = udp_session_get,
-  .get_listener = udp_session_get_listener,
-  .get_half_open = udp_session_get_half_open,
-  .close = udp_session_close,
-  .cleanup = udp_session_cleanup,
-  .send_mss = udp_send_mss,
-  .send_space = udp_send_space,
-  .format_connection = format_udp_session,
-  .format_half_open = format_udp_half_open_session,
-  .format_listener = format_udp_listener_session,
-  .tx_type = TRANSPORT_TX_DGRAM,
-  .service_type = TRANSPORT_SERVICE_CL,
-};
-/* *INDENT-ON* */
+static u8 *
+format_udp_session (u8 * s, va_list * args)
+{
+  u32 uci = va_arg (*args, u32);
+  u32 thread_index = va_arg (*args, u32);
+  u32 verbose = va_arg (*args, u32);
+  udp_connection_t *uc;
 
+  uc = udp_connection_get (uci, thread_index);
+  return format (s, "%U", format_udp_connection, uc, verbose);
+}
 
-int
-udpc_connection_open (transport_endpoint_t * rmt)
+static u8 *
+format_udp_half_open_session (u8 * s, va_list * args)
 {
-  udp_connection_t *uc;
-  u32 uc_index;
-  uc_index = udp_open_connection (rmt);
-  uc = udp_connection_get (uc_index, vlib_get_thread_index ());
-  uc->is_connected = 1;
-  return uc_index;
+  u32 __clib_unused tci = va_arg (*args, u32);
+  u32 __clib_unused thread_index = va_arg (*args, u32);
+  clib_warning ("BUG");
+  return 0;
 }
 
-u32
-udpc_connection_listen (u32 session_index, transport_endpoint_t * lcl)
+static u8 *
+format_udp_listener_session (u8 * s, va_list * args)
 {
-  udp_connection_t *listener;
-  u32 li;
-  li = udp_session_bind (session_index, lcl);
-  listener = udp_listener_get (li);
-  listener->is_connected = 1;
-  return li;
+  u32 tci = va_arg (*args, u32);
+  u32 __clib_unused thread_index = va_arg (*args, u32);
+  u32 verbose = va_arg (*args, u32);
+  udp_connection_t *uc = udp_listener_get (tci);
+  return format (s, "%U", format_udp_connection, uc, verbose);
 }
 
 /* *INDENT-OFF* */
-const static transport_proto_vft_t udpc_proto = {
-  .bind = udpc_connection_listen,
-  .open = udpc_connection_open,
-  .unbind = udp_session_unbind,
+static const transport_proto_vft_t udp_proto = {
+  .start_listen = udp_session_bind,
+  .connect = udp_open_connection,
+  .stop_listen = udp_session_unbind,
   .push_header = udp_push_header,
   .get_connection = udp_session_get,
   .get_listener = udp_session_get_listener,
   .get_half_open = udp_session_get_half_open,
   .close = udp_session_close,
   .cleanup = udp_session_cleanup,
-  .send_mss = udp_send_mss,
-  .send_space = udp_send_space,
+  .send_params = udp_session_send_params,
   .format_connection = format_udp_session,
   .format_half_open = format_udp_half_open_session,
   .format_listener = format_udp_listener_session,
-  .tx_type = TRANSPORT_TX_DEQUEUE,
-  .service_type = TRANSPORT_SERVICE_CL,
+  .transport_options = {
+    .name = "udp",
+    .short_name = "U",
+    .tx_type = TRANSPORT_TX_DGRAM,
+    .service_type = TRANSPORT_SERVICE_CL,
+  },
 };
 /* *INDENT-ON* */
 
@@ -388,17 +470,9 @@ udp_init (vlib_main_t * vm)
   ip_main_t *im = &ip_main;
   vlib_thread_main_t *tm = vlib_get_thread_main ();
   u32 num_threads;
-  clib_error_t *error = 0;
   ip_protocol_info_t *pi;
   int i;
 
-  if ((error = vlib_call_init_function (vm, ip_main_init)))
-    return error;
-  if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
-    return error;
-  if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
-    return error;
-
   /*
    * Registrations
    */
@@ -415,10 +489,6 @@ udp_init (vlib_main_t * vm)
 			       FIB_PROTOCOL_IP4, ip4_lookup_node.index);
   transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
 			       FIB_PROTOCOL_IP6, ip6_lookup_node.index);
-  transport_register_protocol (TRANSPORT_PROTO_UDPC, &udpc_proto,
-			       FIB_PROTOCOL_IP4, ip4_lookup_node.index);
-  transport_register_protocol (TRANSPORT_PROTO_UDPC, &udpc_proto,
-			       FIB_PROTOCOL_IP6, ip6_lookup_node.index);
 
   /*
    * Initialize data structures
@@ -436,10 +506,23 @@ udp_init (vlib_main_t * vm)
 	clib_spinlock_init (&um->peekers_readers_locks[i]);
 	clib_spinlock_init (&um->peekers_write_locks[i]);
       }
-  return error;
+
+  um->local_to_input_edge[UDP_IP4] =
+    vlib_node_add_next (vm, udp4_local_node.index, udp4_input_node.index);
+  um->local_to_input_edge[UDP_IP6] =
+    vlib_node_add_next (vm, udp6_local_node.index, udp6_input_node.index);
+
+  um->default_mtu = 1500;
+  return 0;
 }
 
-VLIB_INIT_FUNCTION (udp_init);
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (udp_init) =
+{
+  .runs_after = VLIB_INITS("ip_main_init", "ip4_lookup_init",
+                           "ip6_lookup_init"),
+};
+/* *INDENT-ON* */
 
 /*
  * fd.io coding-style-patch-verification: ON