src/vnet/session/session.h - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2017 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.
  */
 #ifndef __included_session_h__
 #define __included_session_h__

 #include <vnet/session/transport.h>
 #include <vlibmemory/unix_shared_memory_queue.h>
 #include <vlibmemory/api.h>
 #include <vppinfra/sparse_vec.h>
 #include <svm/svm_fifo_segment.h>

 #define HALF_OPEN_LOOKUP_INVALID_VALUE ((u64)~0)
 #define INVALID_INDEX ((u32)~0)

 /* TODO decide how much since we have pre-data as well */
 #define MAX_HDRS_LEN    100	/* Max number of bytes for headers */

 typedef enum
 {
   FIFO_EVENT_SERVER_RX,
   FIFO_EVENT_SERVER_TX,
   FIFO_EVENT_TIMEOUT,
   FIFO_EVENT_SERVER_EXIT,
 } fifo_event_type_t;

 #define foreach_session_input_error                                         \
 _(NO_SESSION, "No session drops")                                       \
 _(NO_LISTENER, "No listener for dst port drops")                        \
 _(ENQUEUED, "Packets pushed into rx fifo")                              \
 _(NOT_READY, "Session not ready packets")                               \
 _(FIFO_FULL, "Packets dropped for lack of rx fifo space")               \
 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space")      \
 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space")   \
 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair")   \
 _(NO_SPACE, "Couldn't allocate a fifo pair")

 typedef enum
 {
 #define _(sym,str) SESSION_ERROR_##sym,
   foreach_session_input_error
 #undef _
     SESSION_N_ERROR,
 } session_error_t;

 /* Event queue input node static next indices */
 typedef enum
 {
   SESSION_QUEUE_NEXT_DROP,
   SESSION_QUEUE_NEXT_TCP_IP4_OUTPUT,
   SESSION_QUEUE_NEXT_IP4_LOOKUP,
   SESSION_QUEUE_NEXT_TCP_IP6_OUTPUT,
   SESSION_QUEUE_NEXT_IP6_LOOKUP,
   SESSION_QUEUE_N_NEXT,
 } session_queue_next_t;

 #define foreach_session_type                    \
   _(IP4_TCP, ip4_tcp)                           \
   _(IP4_UDP, ip4_udp)                           \
   _(IP6_TCP, ip6_tcp)                           \
   _(IP6_UDP, ip6_udp)

 typedef enum
 {
 #define _(A, a) SESSION_TYPE_##A,
   foreach_session_type
 #undef _
     SESSION_N_TYPES,
 } session_type_t;

 /*
  * Application session state
  */
 typedef enum
 {
   SESSION_STATE_LISTENING,
   SESSION_STATE_CONNECTING,
   SESSION_STATE_READY,
   SESSION_STATE_CLOSED,
   SESSION_STATE_N_STATES,
 } stream_session_state_t;

 typedef CLIB_PACKED (struct
 		     {
 		     svm_fifo_t * fifo;
 		     u8 event_type;
 		     /* $$$$ for event logging */
 		     u16 event_id;
 		     u32 enqueue_length;
 		     }) session_fifo_event_t;

 typedef struct _stream_session_t
 {
   /** Type */
   u8 session_type;

   /** State */
   u8 session_state;

   /** Session index in per_thread pool */
   u32 session_index;

   /** Transport specific */
   u32 connection_index;

   u8 thread_index;

   /** Application specific */
   u32 pid;

   /** fifo pointers. Once allocated, these do not move */
   svm_fifo_t *server_rx_fifo;
   svm_fifo_t *server_tx_fifo;

   /** To avoid n**2 "one event per frame" check */
   u8 enqueue_epoch;

   /** used during unbind processing */
   u8 is_deleted;

   /** stream server pool index */
   u32 app_index;

   /** svm segment index */
   u32 server_segment_index;
 } stream_session_t;

 typedef struct _session_manager
 {
   /** segments mapped by this server */
   u32 *segment_indices;

   /** Session fifo sizes. They are provided for binds and take default
    * values for connects */
   u32 rx_fifo_size;
   u32 tx_fifo_size;

   /** Configured additional segment size */
   u32 add_segment_size;

   /** Flag that indicates if additional segments should be created */
   u8 add_segment;
 } session_manager_t;

 /* Forward definition */
 typedef struct _session_manager_main session_manager_main_t;

 typedef int
   (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
 			session_manager_main_t * smm,
 			session_fifo_event_t * e0, stream_session_t * s0,
 			u32 thread_index, int *n_tx_pkts);

 extern session_fifo_rx_fn session_fifo_rx_peek;
 extern session_fifo_rx_fn session_fifo_rx_dequeue;

 struct _session_manager_main
 {
   /** Lookup tables for established sessions and listeners */
   clib_bihash_16_8_t v4_session_hash;
   clib_bihash_48_8_t v6_session_hash;

   /** Lookup tables for half-open sessions */
   clib_bihash_16_8_t v4_half_open_hash;
   clib_bihash_48_8_t v6_half_open_hash;

   /** Per worker thread session pools */
   stream_session_t **sessions;

   /** Pool of listen sessions. Same type as stream sessions to ease lookups */
   stream_session_t *listen_sessions[SESSION_N_TYPES];

   /** Sparse vector to map dst port to stream server  */
   u16 *stream_server_by_dst_port[SESSION_N_TYPES];

   /** per-worker enqueue epoch counters */
   u8 *current_enqueue_epoch;

   /** Per-worker thread vector of sessions to enqueue */
   u32 **session_indices_to_enqueue_by_thread;

   /** per-worker tx buffer free lists */
   u32 **tx_buffers;

   /** Per worker-thread vector of partially read events */
   session_fifo_event_t **evts_partially_read;

   /** per-worker active event vectors */
   session_fifo_event_t **fifo_events;

   /** vpp fifo event queue */
   unix_shared_memory_queue_t **vpp_event_queues;

   /** Unique segment name counter */
   u32 unique_segment_name_counter;

   /* Connection manager used by incoming connects */
   u32 connect_manager_index[SESSION_N_TYPES];

   session_manager_t *session_managers;

   /** Per transport rx function that can either dequeue or peek */
   session_fifo_rx_fn *session_rx_fns[SESSION_N_TYPES];

   u8 is_enabled;

   /* Convenience */
   vlib_main_t *vlib_main;
   vnet_main_t *vnet_main;
 };

 extern session_manager_main_t session_manager_main;
 extern vlib_node_registration_t session_queue_node;

 /*
  * Session manager function
  */
 always_inline session_manager_main_t *
 vnet_get_session_manager_main ()
 {
   return &session_manager_main;
 }

 always_inline session_manager_t *
 session_manager_get (u32 index)
 {
   return pool_elt_at_index (session_manager_main.session_managers, index);
 }

 always_inline unix_shared_memory_queue_t *
 session_manager_get_vpp_event_queue (u32 thread_index)
 {
   return session_manager_main.vpp_event_queues[thread_index];
 }

 always_inline session_manager_t *
 connects_session_manager_get (session_manager_main_t * smm,
 			      session_type_t session_type)
 {
   return pool_elt_at_index (smm->session_managers,
 			    smm->connect_manager_index[session_type]);
 }

 void session_manager_get_segment_info (u32 index, u8 ** name, u32 * size);
 int session_manager_flush_enqueue_events (u32 thread_index);
 int
 session_manager_add_first_segment (session_manager_main_t * smm,
 				   session_manager_t * sm, u32 segment_size,
 				   u8 ** segment_name);
 void
 session_manager_del (session_manager_main_t * smm, session_manager_t * sm);
 void
 connects_session_manager_init (session_manager_main_t * smm, u8 session_type);

 /*
  * Stream session functions
  */

 stream_session_t *stream_session_lookup_listener4 (ip4_address_t * lcl,
 						   u16 lcl_port, u8 proto);
 stream_session_t *stream_session_lookup4 (ip4_address_t * lcl,
 					  ip4_address_t * rmt, u16 lcl_port,
 					  u16 rmt_port, u8 proto,
 					  u32 thread_index);
 stream_session_t *stream_session_lookup_listener6 (ip6_address_t * lcl,
 						   u16 lcl_port, u8 proto);
 stream_session_t *stream_session_lookup6 (ip6_address_t * lcl,
 					  ip6_address_t * rmt, u16 lcl_port,
 					  u16 rmt_port, u8, u32 thread_index);
 transport_connection_t
   * stream_session_lookup_transport4 (ip4_address_t * lcl,
 				      ip4_address_t * rmt, u16 lcl_port,
 				      u16 rmt_port, u8 proto,
 				      u32 thread_index);
 transport_connection_t
   * stream_session_lookup_transport6 (ip6_address_t * lcl,
 				      ip6_address_t * rmt, u16 lcl_port,
 				      u16 rmt_port, u8 proto,
 				      u32 thread_index);
 stream_session_t *stream_session_lookup_listener (ip46_address_t * lcl,
 						  u16 lcl_port, u8 proto);

 always_inline stream_session_t *
 stream_session_get_tsi (u64 ti_and_si, u32 thread_index)
 {
   ASSERT ((u32) (ti_and_si >> 32) == thread_index);
   return pool_elt_at_index (session_manager_main.sessions[thread_index],
 			    ti_and_si & 0xFFFFFFFFULL);
 }

 always_inline stream_session_t *
 stream_session_get (u64 si, u32 thread_index)
 {
   return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
 }

 always_inline stream_session_t *
 stream_session_get_if_valid (u64 si, u32 thread_index)
 {
   if (thread_index >= vec_len (session_manager_main.sessions))
     return 0;

   if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
     return 0;

   return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
 }

 always_inline stream_session_t *
 stream_session_listener_get (u8 sst, u64 si)
 {
   return pool_elt_at_index (session_manager_main.listen_sessions[sst], si);
 }

 always_inline u32
 stream_session_get_index (stream_session_t * s)
 {
   if (s->session_state == SESSION_STATE_LISTENING)
     return s - session_manager_main.listen_sessions[s->session_type];

   return s - session_manager_main.sessions[s->thread_index];
 }

 always_inline u32
 stream_session_max_enqueue (transport_connection_t * tc)
 {
   stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
   return svm_fifo_max_enqueue (s->server_rx_fifo);
 }

 always_inline u32
 stream_session_fifo_size (transport_connection_t * tc)
 {
   stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
   return s->server_rx_fifo->nitems;
 }


 int
 stream_session_enqueue_data (transport_connection_t * tc, u8 * data, u16 len,
 			     u8 queue_event);
 u32
 stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
 			   u32 offset, u32 max_bytes);
 u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);

 void
 stream_session_connect_notify (transport_connection_t * tc, u8 sst,
 			       u8 is_fail);
 void stream_session_accept_notify (transport_connection_t * tc);
 void stream_session_disconnect_notify (transport_connection_t * tc);
 void stream_session_delete_notify (transport_connection_t * tc);
 void stream_session_reset_notify (transport_connection_t * tc);
 int
 stream_session_accept (transport_connection_t * tc, u32 listener_index,
 		       u8 sst, u8 notify);
 int stream_session_open (u8 sst, ip46_address_t * addr,
 			 u16 port_host_byte_order, u32 api_client_index);
 void stream_session_disconnect (stream_session_t * s);
 void stream_session_cleanup (stream_session_t * s);
 int
 stream_session_start_listen (u32 server_index, ip46_address_t * ip, u16 port);
 void stream_session_stop_listen (u32 server_index);

 u8 *format_stream_session (u8 * s, va_list * args);

 void session_register_transport (u8 type, const transport_proto_vft_t * vft);
 transport_proto_vft_t *session_get_transport_vft (u8 type);

 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);

 #endif /* __included_session_h__ */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2017 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.
	*/
	#ifndef __included_session_h__
	#define __included_session_h__

	#include <vnet/session/transport.h>
	#include <vlibmemory/unix_shared_memory_queue.h>
	#include <vlibmemory/api.h>
	#include <vppinfra/sparse_vec.h>
	#include <svm/svm_fifo_segment.h>

	#define HALF_OPEN_LOOKUP_INVALID_VALUE ((u64)~0)
	#define INVALID_INDEX ((u32)~0)

	/* TODO decide how much since we have pre-data as well */
	#define MAX_HDRS_LEN 100 /* Max number of bytes for headers */

	typedef enum
	{
	FIFO_EVENT_SERVER_RX,
	FIFO_EVENT_SERVER_TX,
	FIFO_EVENT_TIMEOUT,
	FIFO_EVENT_SERVER_EXIT,
	} fifo_event_type_t;

	#define foreach_session_input_error \
	_(NO_SESSION, "No session drops") \
	_(NO_LISTENER, "No listener for dst port drops") \
	_(ENQUEUED, "Packets pushed into rx fifo") \
	_(NOT_READY, "Session not ready packets") \
	_(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
	_(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
	_(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
	_(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair") \
	_(NO_SPACE, "Couldn't allocate a fifo pair")

	typedef enum
	{
	#define _(sym,str) SESSION_ERROR_##sym,
	foreach_session_input_error
	#undef _
	SESSION_N_ERROR,
	} session_error_t;

	/* Event queue input node static next indices */
	typedef enum
	{
	SESSION_QUEUE_NEXT_DROP,
	SESSION_QUEUE_NEXT_TCP_IP4_OUTPUT,
	SESSION_QUEUE_NEXT_IP4_LOOKUP,
	SESSION_QUEUE_NEXT_TCP_IP6_OUTPUT,
	SESSION_QUEUE_NEXT_IP6_LOOKUP,
	SESSION_QUEUE_N_NEXT,
	} session_queue_next_t;

	#define foreach_session_type \
	_(IP4_TCP, ip4_tcp) \
	_(IP4_UDP, ip4_udp) \
	_(IP6_TCP, ip6_tcp) \
	_(IP6_UDP, ip6_udp)

	typedef enum
	{
	#define _(A, a) SESSION_TYPE_##A,
	foreach_session_type
	#undef _
	SESSION_N_TYPES,
	} session_type_t;

	/*
	* Application session state
	*/
	typedef enum
	{
	SESSION_STATE_LISTENING,
	SESSION_STATE_CONNECTING,
	SESSION_STATE_READY,
	SESSION_STATE_CLOSED,
	SESSION_STATE_N_STATES,
	} stream_session_state_t;

	typedef CLIB_PACKED (struct
	{
	svm_fifo_t * fifo;
	u8 event_type;
	/* $$$$ for event logging */
	u16 event_id;
	u32 enqueue_length;
	}) session_fifo_event_t;

	typedef struct _stream_session_t
	{
	/** Type */
	u8 session_type;

	/** State */
	u8 session_state;

	/** Session index in per_thread pool */
	u32 session_index;

	/** Transport specific */
	u32 connection_index;

	u8 thread_index;

	/** Application specific */
	u32 pid;

	/** fifo pointers. Once allocated, these do not move */
	svm_fifo_t *server_rx_fifo;
	svm_fifo_t *server_tx_fifo;

	/ To avoid n2 "one event per frame" check */
	u8 enqueue_epoch;

	/** used during unbind processing */
	u8 is_deleted;

	/** stream server pool index */
	u32 app_index;

	/** svm segment index */
	u32 server_segment_index;
	} stream_session_t;

	typedef struct _session_manager
	{
	/** segments mapped by this server */
	u32 *segment_indices;

	/** Session fifo sizes. They are provided for binds and take default
	* values for connects */
	u32 rx_fifo_size;
	u32 tx_fifo_size;

	/** Configured additional segment size */
	u32 add_segment_size;

	/** Flag that indicates if additional segments should be created */
	u8 add_segment;
	} session_manager_t;

	/* Forward definition */
	typedef struct _session_manager_main session_manager_main_t;

	typedef int
	(session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
	session_manager_main_t * smm,
	session_fifo_event_t * e0, stream_session_t * s0,
	u32 thread_index, int *n_tx_pkts);

	extern session_fifo_rx_fn session_fifo_rx_peek;
	extern session_fifo_rx_fn session_fifo_rx_dequeue;

	struct _session_manager_main
	{
	/** Lookup tables for established sessions and listeners */
	clib_bihash_16_8_t v4_session_hash;
	clib_bihash_48_8_t v6_session_hash;

	/** Lookup tables for half-open sessions */
	clib_bihash_16_8_t v4_half_open_hash;
	clib_bihash_48_8_t v6_half_open_hash;

	/** Per worker thread session pools */
	stream_session_t **sessions;

	/** Pool of listen sessions. Same type as stream sessions to ease lookups */
	stream_session_t *listen_sessions[SESSION_N_TYPES];

	/** Sparse vector to map dst port to stream server */
	u16 *stream_server_by_dst_port[SESSION_N_TYPES];

	/** per-worker enqueue epoch counters */
	u8 *current_enqueue_epoch;

	/** Per-worker thread vector of sessions to enqueue */
	u32 **session_indices_to_enqueue_by_thread;

	/** per-worker tx buffer free lists */
	u32 **tx_buffers;

	/** Per worker-thread vector of partially read events */
	session_fifo_event_t **evts_partially_read;

	/** per-worker active event vectors */
	session_fifo_event_t **fifo_events;

	/** vpp fifo event queue */
	unix_shared_memory_queue_t **vpp_event_queues;

	/** Unique segment name counter */
	u32 unique_segment_name_counter;

	/* Connection manager used by incoming connects */
	u32 connect_manager_index[SESSION_N_TYPES];

	session_manager_t *session_managers;

	/** Per transport rx function that can either dequeue or peek */
	session_fifo_rx_fn *session_rx_fns[SESSION_N_TYPES];

	u8 is_enabled;

	/* Convenience */
	vlib_main_t *vlib_main;
	vnet_main_t *vnet_main;
	};

	extern session_manager_main_t session_manager_main;
	extern vlib_node_registration_t session_queue_node;

	/*
	* Session manager function
	*/
	always_inline session_manager_main_t *
	vnet_get_session_manager_main ()
	{
	return &session_manager_main;
	}

	always_inline session_manager_t *
	session_manager_get (u32 index)
	{
	return pool_elt_at_index (session_manager_main.session_managers, index);
	}

	always_inline unix_shared_memory_queue_t *
	session_manager_get_vpp_event_queue (u32 thread_index)
	{
	return session_manager_main.vpp_event_queues[thread_index];
	}

	always_inline session_manager_t *
	connects_session_manager_get (session_manager_main_t * smm,
	session_type_t session_type)
	{
	return pool_elt_at_index (smm->session_managers,
	smm->connect_manager_index[session_type]);
	}

	void session_manager_get_segment_info (u32 index, u8 ** name, u32 * size);
	int session_manager_flush_enqueue_events (u32 thread_index);
	int
	session_manager_add_first_segment (session_manager_main_t * smm,
	session_manager_t * sm, u32 segment_size,
	u8 ** segment_name);
	void
	session_manager_del (session_manager_main_t * smm, session_manager_t * sm);
	void
	connects_session_manager_init (session_manager_main_t * smm, u8 session_type);

	/*
	* Stream session functions
	*/

	stream_session_t stream_session_lookup_listener4 (ip4_address_t lcl,
	u16 lcl_port, u8 proto);
	stream_session_t stream_session_lookup4 (ip4_address_t lcl,
	ip4_address_t * rmt, u16 lcl_port,
	u16 rmt_port, u8 proto,
	u32 thread_index);
	stream_session_t stream_session_lookup_listener6 (ip6_address_t lcl,
	u16 lcl_port, u8 proto);
	stream_session_t stream_session_lookup6 (ip6_address_t lcl,
	ip6_address_t * rmt, u16 lcl_port,
	u16 rmt_port, u8, u32 thread_index);
	transport_connection_t
	* stream_session_lookup_transport4 (ip4_address_t * lcl,
	ip4_address_t * rmt, u16 lcl_port,
	u16 rmt_port, u8 proto,
	u32 thread_index);
	transport_connection_t
	* stream_session_lookup_transport6 (ip6_address_t * lcl,
	ip6_address_t * rmt, u16 lcl_port,
	u16 rmt_port, u8 proto,
	u32 thread_index);
	stream_session_t stream_session_lookup_listener (ip46_address_t lcl,
	u16 lcl_port, u8 proto);

	always_inline stream_session_t *
	stream_session_get_tsi (u64 ti_and_si, u32 thread_index)
	{
	ASSERT ((u32) (ti_and_si >> 32) == thread_index);
	return pool_elt_at_index (session_manager_main.sessions[thread_index],
	ti_and_si & 0xFFFFFFFFULL);
	}

	always_inline stream_session_t *
	stream_session_get (u64 si, u32 thread_index)
	{
	return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
	}

	always_inline stream_session_t *
	stream_session_get_if_valid (u64 si, u32 thread_index)
	{
	if (thread_index >= vec_len (session_manager_main.sessions))
	return 0;

	if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
	return 0;

	return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
	}

	always_inline stream_session_t *
	stream_session_listener_get (u8 sst, u64 si)
	{
	return pool_elt_at_index (session_manager_main.listen_sessions[sst], si);
	}

	always_inline u32
	stream_session_get_index (stream_session_t * s)
	{
	if (s->session_state == SESSION_STATE_LISTENING)
	return s - session_manager_main.listen_sessions[s->session_type];

	return s - session_manager_main.sessions[s->thread_index];
	}

	always_inline u32
	stream_session_max_enqueue (transport_connection_t * tc)
	{
	stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
	return svm_fifo_max_enqueue (s->server_rx_fifo);
	}

	always_inline u32
	stream_session_fifo_size (transport_connection_t * tc)
	{
	stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
	return s->server_rx_fifo->nitems;
	}


	int
	stream_session_enqueue_data (transport_connection_t * tc, u8 * data, u16 len,
	u8 queue_event);
	u32
	stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
	u32 offset, u32 max_bytes);
	u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);

	void
	stream_session_connect_notify (transport_connection_t * tc, u8 sst,
	u8 is_fail);
	void stream_session_accept_notify (transport_connection_t * tc);
	void stream_session_disconnect_notify (transport_connection_t * tc);
	void stream_session_delete_notify (transport_connection_t * tc);
	void stream_session_reset_notify (transport_connection_t * tc);
	int
	stream_session_accept (transport_connection_t * tc, u32 listener_index,
	u8 sst, u8 notify);
	int stream_session_open (u8 sst, ip46_address_t * addr,
	u16 port_host_byte_order, u32 api_client_index);
	void stream_session_disconnect (stream_session_t * s);
	void stream_session_cleanup (stream_session_t * s);
	int
	stream_session_start_listen (u32 server_index, ip46_address_t * ip, u16 port);
	void stream_session_stop_listen (u32 server_index);

	u8 format_stream_session (u8 s, va_list * args);

	void session_register_transport (u8 type, const transport_proto_vft_t * vft);
	transport_proto_vft_t *session_get_transport_vft (u8 type);

	clib_error_t vnet_session_enable_disable (vlib_main_t vm, u8 is_en);

	#endif /* __included_session_h__ */

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