src/vnet/udp/udp.c - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2016 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:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * 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>

 udp_connection_t *
 udp_connection_alloc (u32 thread_index)
 {
   udp_main_t *um = &udp_main;
   udp_connection_t *uc;
   u32 will_expand = 0;
   pool_get_aligned_will_expand (um->connections[thread_index], will_expand,
 				CLIB_CACHE_LINE_BYTES);

   if (PREDICT_FALSE (will_expand))
     {
       clib_spinlock_lock_if_init (&udp_main.peekers_write_locks
 				  [thread_index]);
       pool_get_aligned (udp_main.connections[thread_index], uc,
 			CLIB_CACHE_LINE_BYTES);
       clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks
 				    [thread_index]);
     }
   else
     {
       pool_get_aligned (um->connections[thread_index], uc,
 			CLIB_CACHE_LINE_BYTES);
     }
   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;
   clib_spinlock_init (&uc->rx_lock);
   return uc;
 }

 void
 udp_connection_free (udp_connection_t * uc)
 {
   pool_put (udp_main.connections[uc->c_thread_index], uc);
   if (CLIB_DEBUG)
     memset (uc, 0xFA, sizeof (*uc));
 }

 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 ();
   udp_connection_t *listener;
   u32 node_index;
   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;

   pool_get (um->listener_pool, listener);
   memset (listener, 0, sizeof (udp_connection_t));

   listener->c_lcl_port = lcl->port;
   listener->c_c_index = listener - um->listener_pool;

   /* If we are provided a sw_if_index, bind using one of its ips */
   if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX)
     {
       if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index,
 						 lcl->is_ip4)))
 	ip_set (&lcl->ip, iface_ip, lcl->is_ip4);
     }
   ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4);
   listener->c_is_ip4 = lcl->is_ip4;
   listener->c_proto = TRANSPORT_PROTO_UDP;
   listener->c_s_index = session_index;
   listener->c_fib_index = lcl->fib_index;
   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 */ );
   return listener->c_c_index;
 }

 u32
 udp_session_unbind (u32 listener_index)
 {
   vlib_main_t *vm = vlib_get_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);
   return 0;
 }

 transport_connection_t *
 udp_session_get_listener (u32 listener_index)
 {
   udp_connection_t *us;

   us = udp_listener_get (listener_index);
   return &us->connection;
 }

 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);

   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);
   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;
     }
   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;

   return 0;
 }

 transport_connection_t *
 udp_session_get (u32 connection_index, u32 thread_index)
 {
   udp_connection_t *uc;
   uc = udp_connection_get (connection_index, thread_index);
   if (uc)
     return &uc->connection;
   return 0;
 }

 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);
     }
 }

 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));
   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;
 }

 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);
 }

 u8 *
 format_udp_half_open_session (u8 * s, va_list * args)
 {
   clib_warning ("BUG");
   return 0;
 }

 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;
 }

 int
 udp_open_connection (transport_endpoint_t * rmt)
 {
   udp_main_t *um = vnet_get_udp_main ();
   vlib_main_t *vm = vlib_get_main ();
   u32 thread_index = vm->thread_index;
   udp_connection_t *uc;
   ip46_address_t lcl_addr;
   u32 node_index;
   u16 lcl_port;

   if (transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
 				      &lcl_port))
     return -1;

   while (udp_get_dst_port_info (um, lcl_port, rmt->is_ip4))
     {
       lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP, &lcl_addr);
       if (lcl_port < 1)
 	{
 	  clib_warning ("Failed to allocate src port");
 	  return -1;
 	}
     }

   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 */ );

   /* We don't poll main thread if we have workers */
   if (vlib_num_workers ())
     thread_index = 1;

   uc = udp_connection_alloc (thread_index);
   ip_copy (&uc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
   ip_copy (&uc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
   uc->c_rmt_port = rmt->port;
   uc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
   uc->c_is_ip4 = rmt->is_ip4;
   uc->c_proto = TRANSPORT_PROTO_UDP;
   uc->c_fib_index = rmt->fib_index;

   return uc->c_c_index;
 }

 transport_connection_t *
 udp_session_get_half_open (u32 conn_index)
 {
   udp_connection_t *uc;
   u32 thread_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);
   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* */


 int
 udpc_connection_open (transport_endpoint_t * rmt)
 {
   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
 udpc_connection_listen (u32 session_index, transport_endpoint_t * lcl)
 {
   udp_connection_t *listener;
   u32 li;
   li = udp_session_bind (session_index, lcl);
   listener = udp_listener_get (li);
   listener->is_connected = 1;
   return li;
 }

 /* *INDENT-OFF* */
 const static transport_proto_vft_t udpc_proto = {
   .bind = udpc_connection_listen,
   .open = udpc_connection_open,
   .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_DEQUEUE,
   .service_type = TRANSPORT_SERVICE_CL,
 };
 /* *INDENT-ON* */

 static clib_error_t *
 udp_init (vlib_main_t * vm)
 {
   udp_main_t *um = vnet_get_udp_main ();
   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
    */

   /* IP registration */
   pi = ip_get_protocol_info (im, IP_PROTOCOL_UDP);
   if (pi == 0)
     return clib_error_return (0, "UDP protocol info AWOL");
   pi->format_header = format_udp_header;
   pi->unformat_pg_edit = unformat_pg_udp_header;

   /* Register as transport with URI */
   transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
 			       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
    */

   num_threads = 1 /* main thread */  + tm->n_threads;
   vec_validate (um->connections, num_threads - 1);
   vec_validate (um->connection_peekers, num_threads - 1);
   vec_validate (um->peekers_readers_locks, num_threads - 1);
   vec_validate (um->peekers_write_locks, num_threads - 1);

   if (num_threads > 1)
     for (i = 0; i < num_threads; i++)
       {
 	clib_spinlock_init (&um->peekers_readers_locks[i]);
 	clib_spinlock_init (&um->peekers_write_locks[i]);
       }
   return error;
 }

 VLIB_INIT_FUNCTION (udp_init);

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2016 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:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* 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>

	udp_connection_t *
	udp_connection_alloc (u32 thread_index)
	{
	udp_main_t *um = &udp_main;
	udp_connection_t *uc;
	u32 will_expand = 0;
	pool_get_aligned_will_expand (um->connections[thread_index], will_expand,
	CLIB_CACHE_LINE_BYTES);

	if (PREDICT_FALSE (will_expand))
	{
	clib_spinlock_lock_if_init (&udp_main.peekers_write_locks
	[thread_index]);
	pool_get_aligned (udp_main.connections[thread_index], uc,
	CLIB_CACHE_LINE_BYTES);
	clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks
	[thread_index]);
	}
	else
	{
	pool_get_aligned (um->connections[thread_index], uc,
	CLIB_CACHE_LINE_BYTES);
	}
	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;
	clib_spinlock_init (&uc->rx_lock);
	return uc;
	}

	void
	udp_connection_free (udp_connection_t * uc)
	{
	pool_put (udp_main.connections[uc->c_thread_index], uc);
	if (CLIB_DEBUG)
	memset (uc, 0xFA, sizeof (*uc));
	}

	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 ();
	udp_connection_t *listener;
	u32 node_index;
	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;

	pool_get (um->listener_pool, listener);
	memset (listener, 0, sizeof (udp_connection_t));

	listener->c_lcl_port = lcl->port;
	listener->c_c_index = listener - um->listener_pool;

	/* If we are provided a sw_if_index, bind using one of its ips */
	if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX)
	{
	if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index,
	lcl->is_ip4)))
	ip_set (&lcl->ip, iface_ip, lcl->is_ip4);
	}
	ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4);
	listener->c_is_ip4 = lcl->is_ip4;
	listener->c_proto = TRANSPORT_PROTO_UDP;
	listener->c_s_index = session_index;
	listener->c_fib_index = lcl->fib_index;
	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 */ );
	return listener->c_c_index;
	}

	u32
	udp_session_unbind (u32 listener_index)
	{
	vlib_main_t *vm = vlib_get_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);
	return 0;
	}

	transport_connection_t *
	udp_session_get_listener (u32 listener_index)
	{
	udp_connection_t *us;

	us = udp_listener_get (listener_index);
	return &us->connection;
	}

	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);

	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);
	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;
	}
	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;

	return 0;
	}

	transport_connection_t *
	udp_session_get (u32 connection_index, u32 thread_index)
	{
	udp_connection_t *uc;
	uc = udp_connection_get (connection_index, thread_index);
	if (uc)
	return &uc->connection;
	return 0;
	}

	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);
	}
	}

	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));
	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;
	}

	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);
	}

	u8 *
	format_udp_half_open_session (u8 * s, va_list * args)
	{
	clib_warning ("BUG");
	return 0;
	}

	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;
	}

	int
	udp_open_connection (transport_endpoint_t * rmt)
	{
	udp_main_t *um = vnet_get_udp_main ();
	vlib_main_t *vm = vlib_get_main ();
	u32 thread_index = vm->thread_index;
	udp_connection_t *uc;
	ip46_address_t lcl_addr;
	u32 node_index;
	u16 lcl_port;

	if (transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
	&lcl_port))
	return -1;

	while (udp_get_dst_port_info (um, lcl_port, rmt->is_ip4))
	{
	lcl_port = transport_alloc_local_port (TRANSPORT_PROTO_UDP, &lcl_addr);
	if (lcl_port < 1)
	{
	clib_warning ("Failed to allocate src port");
	return -1;
	}
	}

	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 */ );

	/* We don't poll main thread if we have workers */
	if (vlib_num_workers ())
	thread_index = 1;

	uc = udp_connection_alloc (thread_index);
	ip_copy (&uc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
	ip_copy (&uc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
	uc->c_rmt_port = rmt->port;
	uc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
	uc->c_is_ip4 = rmt->is_ip4;
	uc->c_proto = TRANSPORT_PROTO_UDP;
	uc->c_fib_index = rmt->fib_index;

	return uc->c_c_index;
	}

	transport_connection_t *
	udp_session_get_half_open (u32 conn_index)
	{
	udp_connection_t *uc;
	u32 thread_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);
	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 */


	int
	udpc_connection_open (transport_endpoint_t * rmt)
	{
	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
	udpc_connection_listen (u32 session_index, transport_endpoint_t * lcl)
	{
	udp_connection_t *listener;
	u32 li;
	li = udp_session_bind (session_index, lcl);
	listener = udp_listener_get (li);
	listener->is_connected = 1;
	return li;
	}

	/* INDENT-OFF */
	const static transport_proto_vft_t udpc_proto = {
	.bind = udpc_connection_listen,
	.open = udpc_connection_open,
	.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_DEQUEUE,
	.service_type = TRANSPORT_SERVICE_CL,
	};
	/* INDENT-ON */

	static clib_error_t *
	udp_init (vlib_main_t * vm)
	{
	udp_main_t *um = vnet_get_udp_main ();
	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
	*/

	/* IP registration */
	pi = ip_get_protocol_info (im, IP_PROTOCOL_UDP);
	if (pi == 0)
	return clib_error_return (0, "UDP protocol info AWOL");
	pi->format_header = format_udp_header;
	pi->unformat_pg_edit = unformat_pg_udp_header;

	/* Register as transport with URI */
	transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
	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
	*/

	num_threads = 1 /* main thread */ + tm->n_threads;
	vec_validate (um->connections, num_threads - 1);
	vec_validate (um->connection_peekers, num_threads - 1);
	vec_validate (um->peekers_readers_locks, num_threads - 1);
	vec_validate (um->peekers_write_locks, num_threads - 1);

	if (num_threads > 1)
	for (i = 0; i < num_threads; i++)
	{
	clib_spinlock_init (&um->peekers_readers_locks[i]);
	clib_spinlock_init (&um->peekers_write_locks[i]);
	}
	return error;
	}

	VLIB_INIT_FUNCTION (udp_init);

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/