aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/session/session.h
blob: a98986124d77faac087a545b936c30fe14eb8cc6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
/*
 * 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/stream_session.h>
#include <vnet/session/session_lookup.h>
#include <vnet/session/transport_interface.h>
#include <vnet/session/session_debug.h>
#include <vnet/session/segment_manager.h>
#include <svm/queue.h>

#define HALF_OPEN_LOOKUP_INVALID_VALUE ((u64)~0)
#define INVALID_INDEX ((u32)~0)
#define SESSION_PROXY_LISTENER_INDEX ((u8)~0 - 1)
#define SESSION_LOCAL_HANDLE_PREFIX 0x7FFFFFFF

/* 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_APP_RX,
  SESSION_IO_EVT_CT_RX,
  FIFO_EVENT_APP_TX,
  SESSION_IO_EVT_CT_TX,
  FIFO_EVENT_DISCONNECT,
  FIFO_EVENT_BUILTIN_RX,
  FIFO_EVENT_BUILTIN_TX,
  FIFO_EVENT_RPC,
  SESSION_CTRL_EVT_BOUND,
  SESSION_CTRL_EVT_ACCEPTED,
  SESSION_CTRL_EVT_ACCEPTED_REPLY,
  SESSION_CTRL_EVT_CONNECTED,
  SESSION_CTRL_EVT_CONNECTED_REPLY,
  SESSION_CTRL_EVT_DISCONNECTED,
  SESSION_CTRL_EVT_DISCONNECTED_REPLY,
  SESSION_CTRL_EVT_RESET,
  SESSION_CTRL_EVT_RESET_REPLY
} session_evt_type_t;

static inline const char *
fifo_event_type_str (session_evt_type_t et)
{
  switch (et)
    {
    case FIFO_EVENT_APP_RX:
      return "FIFO_EVENT_APP_RX";
    case FIFO_EVENT_APP_TX:
      return "FIFO_EVENT_APP_TX";
    case FIFO_EVENT_DISCONNECT:
      return "FIFO_EVENT_DISCONNECT";
    case FIFO_EVENT_BUILTIN_RX:
      return "FIFO_EVENT_BUILTIN_RX";
    case FIFO_EVENT_RPC:
      return "FIFO_EVENT_RPC";
    default:
      return "UNKNOWN FIFO EVENT";
    }
}

typedef enum
{
  SESSION_MQ_IO_EVT_RING,
  SESSION_MQ_CTRL_EVT_RING,
  SESSION_MQ_N_RINGS
} session_mq_rings_e;

#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")				\
_(SEG_CREATE, "Couldn't create a new segment")

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

typedef struct
{
  void *fp;
  void *arg;
} session_rpc_args_t;

typedef u64 session_handle_t;

/* *INDENT-OFF* */
typedef struct
{
  u8 event_type;
  u8 postponed;
  union
  {
    svm_fifo_t *fifo;
    session_handle_t session_handle;
    session_rpc_args_t rpc_args;
    struct
    {
      u8 data[0];
    };
  };
} __clib_packed session_event_t;
/* *INDENT-ON* */

#define SESSION_MSG_NULL { }

typedef struct session_dgram_pre_hdr_
{
  u32 data_length;
  u32 data_offset;
} session_dgram_pre_hdr_t;

/* *INDENT-OFF* */
typedef CLIB_PACKED (struct session_dgram_header_
{
  u32 data_length;
  u32 data_offset;
  ip46_address_t rmt_ip;
  ip46_address_t lcl_ip;
  u16 rmt_port;
  u16 lcl_port;
  u8 is_ip4;
}) session_dgram_hdr_t;
/* *INDENT-ON* */

#define SESSION_CONN_ID_LEN 37
#define SESSION_CONN_HDR_LEN 45

STATIC_ASSERT (sizeof (session_dgram_hdr_t) == (SESSION_CONN_ID_LEN + 8),
	       "session conn id wrong length");

typedef struct session_tx_context_
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
  stream_session_t *s;
  transport_proto_vft_t *transport_vft;
  transport_connection_t *tc;
  vlib_buffer_t *b;
  u32 max_dequeue;
  u32 snd_space;
  u32 left_to_snd;
  u32 tx_offset;
  u32 max_len_to_snd;
  u16 deq_per_first_buf;
  u16 deq_per_buf;
  u16 snd_mss;
  u16 n_segs_per_evt;
  u8 n_bufs_per_seg;
    CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
  session_dgram_hdr_t hdr;
} session_tx_context_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_event_t * e0, stream_session_t * s0,
			int *n_tx_pkts);

extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;

u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);

typedef struct session_manager_worker_
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);

  /** Worker session pool */
  stream_session_t *sessions;

  /** vpp event message queue for worker */
  svm_msg_q_t *vpp_event_queue;

  /** Our approximation of a "complete" dispatch loop period */
  f64 dispatch_period;

  /** vlib_time_now last time around the track */
  f64 last_vlib_time;

  /** Per-proto enqueue epoch counters */
  u64 current_enqueue_epoch[TRANSPORT_N_PROTO];

  /** Per-proto vector of sessions to enqueue */
  u32 *session_to_enqueue[TRANSPORT_N_PROTO];

  /** Context for session tx */
  session_tx_context_t ctx;

  /** Vector of tx buffer free lists */
  u32 *tx_buffers;

  /** Vector of partially read events */
  session_event_t *free_event_vector;

  /** Vector of active event vectors */
  session_event_t *pending_event_vector;

  /** Vector of postponed disconnects */
  session_event_t *pending_disconnects;

  /** Peekers rw lock */
  clib_rwlock_t peekers_rw_locks;

} session_manager_worker_t;

struct _session_manager_main
{
  /** Worker contexts */
  session_manager_worker_t *wrk;

  /** Event queues memfd segment initialized only if so configured */
  ssvm_private_t evt_qs_segment;

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

  /** Per transport rx function that can either dequeue or peek */
  session_fifo_rx_fn **session_tx_fns;

  /** Per session type output nodes. Could optimize to group nodes by
   * fib but lookup would then require session type parsing in session node.
   * Trade memory for speed, for now */
  u32 *session_type_to_next;

  /*
   * Config parameters
   */

  /** Session manager is enabled */
  u8 is_enabled;

  /** vpp fifo event queue configured length */
  u32 configured_event_queue_length;

  /** Session ssvm segment configs*/
  uword session_baseva;
  uword session_va_space_size;
  u32 evt_qs_segment_size;
  u8 evt_qs_use_memfd_seg;

  /** Session table size parameters */
  u32 configured_v4_session_table_buckets;
  u32 configured_v4_session_table_memory;
  u32 configured_v4_halfopen_table_buckets;
  u32 configured_v4_halfopen_table_memory;
  u32 configured_v6_session_table_buckets;
  u32 configured_v6_session_table_memory;
  u32 configured_v6_halfopen_table_buckets;
  u32 configured_v6_halfopen_table_memory;

  /** Transport table (preallocation) size parameters */
  u32 local_endpoints_table_memory;
  u32 local_endpoints_table_buckets;

  /** Preallocate session config parameter */
  u32 preallocated_sessions;

#if SESSION_DEBUG
  /**
   * last event poll time by thread
   * Debug only. Will cause false cache-line sharing as-is
   */
  f64 *last_event_poll_by_thread;
#endif

};

extern session_manager_main_t session_manager_main;
extern vlib_node_registration_t session_queue_node;
extern vlib_node_registration_t session_queue_process_node;

#define SESSION_Q_PROCESS_FLUSH_FRAMES	1
#define SESSION_Q_PROCESS_STOP		2

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

always_inline session_manager_worker_t *
session_manager_get_worker (u32 thread_index)
{
  return &session_manager_main.wrk[thread_index];
}

always_inline u8
stream_session_is_valid (u32 si, u8 thread_index)
{
  stream_session_t *s;
  s = pool_elt_at_index (session_manager_main.wrk[thread_index].sessions, si);
  if (s->thread_index != thread_index || s->session_index != si
      /* || s->server_rx_fifo->master_session_index != si
         || s->server_tx_fifo->master_session_index != si
         || s->server_rx_fifo->master_thread_index != thread_index
         || s->server_tx_fifo->master_thread_index != thread_index */ )
    return 0;
  return 1;
}

stream_session_t *session_alloc (u32 thread_index);
int session_alloc_fifos (segment_manager_t * sm, stream_session_t * s);
void session_free (stream_session_t * s);
void session_free_w_fifos (stream_session_t * s);

always_inline stream_session_t *
session_get (u32 si, u32 thread_index)
{
  ASSERT (stream_session_is_valid (si, thread_index));
  return pool_elt_at_index (session_manager_main.wrk[thread_index].sessions,
			    si);
}

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

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

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

always_inline session_handle_t
session_handle (stream_session_t * s)
{
  return ((u64) s->thread_index << 32) | (u64) s->session_index;
}

always_inline u32
session_index_from_handle (session_handle_t handle)
{
  return handle & 0xFFFFFFFF;
}

always_inline u32
session_thread_from_handle (session_handle_t handle)
{
  return handle >> 32;
}

always_inline void
session_parse_handle (session_handle_t handle, u32 * index,
		      u32 * thread_index)
{
  *index = session_index_from_handle (handle);
  *thread_index = session_thread_from_handle (handle);
}

always_inline stream_session_t *
session_get_from_handle (session_handle_t handle)
{
  session_manager_main_t *smm = &session_manager_main;
  u32 session_index, thread_index;
  session_parse_handle (handle, &session_index, &thread_index);
  return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
}

always_inline stream_session_t *
session_get_from_handle_if_valid (session_handle_t handle)
{
  u32 session_index, thread_index;
  session_parse_handle (handle, &session_index, &thread_index);
  return session_get_if_valid (session_index, thread_index);
}

always_inline u8
session_handle_is_local (session_handle_t handle)
{
  if ((handle >> 32) == SESSION_LOCAL_HANDLE_PREFIX)
    return 1;
  return 0;
}

always_inline transport_proto_t
session_type_transport_proto (session_type_t st)
{
  return (st >> 1);
}

always_inline u8
session_type_is_ip4 (session_type_t st)
{
  return (st & 1);
}

always_inline transport_proto_t
session_get_transport_proto (stream_session_t * s)
{
  return (s->session_type >> 1);
}

always_inline fib_protocol_t
session_get_fib_proto (stream_session_t * s)
{
  u8 is_ip4 = s->session_type & 1;
  return (is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6);
}

always_inline session_type_t
session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
{
  return (proto << 1 | is_ip4);
}

always_inline u8
session_has_transport (stream_session_t * s)
{
  return (session_get_transport_proto (s) != TRANSPORT_PROTO_NONE);
}

transport_service_type_t session_transport_service_type (stream_session_t *);
transport_tx_fn_type_t session_transport_tx_fn_type (stream_session_t *);
u8 session_tx_is_dgram (stream_session_t * s);

/**
 * Acquires a lock that blocks a session pool from expanding.
 *
 * This is typically used for safely peeking into other threads'
 * pools in order to clone elements. Lock should be dropped as soon
 * as possible by calling @ref session_pool_remove_peeker.
 *
 * NOTE: Avoid using pool_elt_at_index while the lock is held because
 * it may lead to free elt bitmap expansion/contraction!
 */
always_inline void
session_pool_add_peeker (u32 thread_index)
{
  session_manager_worker_t *wrk = &session_manager_main.wrk[thread_index];
  if (thread_index == vlib_get_thread_index ())
    return;
  clib_rwlock_reader_lock (&wrk->peekers_rw_locks);
}

always_inline void
session_pool_remove_peeker (u32 thread_index)
{
  session_manager_worker_t *wrk = &session_manager_main.wrk[thread_index];
  if (thread_index == vlib_get_thread_index ())
    return;
  clib_rwlock_reader_unlock (&wrk->peekers_rw_locks);
}

/**
 * Get session from handle and 'lock' pool resize if not in same thread
 *
 * Caller should drop the peek 'lock' as soon as possible.
 */
always_inline stream_session_t *
session_get_from_handle_safe (u64 handle)
{
  u32 thread_index = session_thread_from_handle (handle);
  session_manager_worker_t *wrk = &session_manager_main.wrk[thread_index];

  if (thread_index == vlib_get_thread_index ())
    {
      return pool_elt_at_index (wrk->sessions,
				session_index_from_handle (handle));
    }
  else
    {
      session_pool_add_peeker (thread_index);
      /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
      return wrk->sessions + session_index_from_handle (handle);
    }
}

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

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

always_inline u32
transport_tx_fifo_size (transport_connection_t * tc)
{
  stream_session_t *s = session_get (tc->s_index, tc->thread_index);
  return s->server_tx_fifo->nitems;
}

always_inline f64
transport_dispatch_period (u32 thread_index)
{
  return session_manager_main.wrk[thread_index].dispatch_period;
}

always_inline f64
transport_time_now (u32 thread_index)
{
  return session_manager_main.wrk[thread_index].last_vlib_time;
}

always_inline u32
session_get_index (stream_session_t * s)
{
  return (s - session_manager_main.wrk[s->thread_index].sessions);
}

always_inline stream_session_t *
session_clone_safe (u32 session_index, u32 thread_index)
{
  stream_session_t *old_s, *new_s;
  u32 current_thread_index = vlib_get_thread_index ();

  /* If during the memcpy pool is reallocated AND the memory allocator
   * decides to give the old chunk of memory to somebody in a hurry to
   * scribble something on it, we have a problem. So add this thread as
   * a session pool peeker.
   */
  session_pool_add_peeker (thread_index);
  new_s = session_alloc (current_thread_index);
  old_s = session_manager_main.wrk[thread_index].sessions + session_index;
  clib_memcpy (new_s, old_s, sizeof (*new_s));
  session_pool_remove_peeker (thread_index);
  new_s->thread_index = current_thread_index;
  new_s->session_index = session_get_index (new_s);
  return new_s;
}

transport_connection_t *session_get_transport (stream_session_t * s);

u32 session_tx_fifo_max_dequeue (transport_connection_t * tc);

int
session_enqueue_stream_connection (transport_connection_t * tc,
				   vlib_buffer_t * b, u32 offset,
				   u8 queue_event, u8 is_in_order);
int session_enqueue_dgram_connection (stream_session_t * s,
				      session_dgram_hdr_t * hdr,
				      vlib_buffer_t * b, u8 proto,
				      u8 queue_event);
int 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);

int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
int session_dgram_connect_notify (transport_connection_t * tc,
				  u32 old_thread_index,
				  stream_session_t ** new_session);
int session_dequeue_notify (stream_session_t * s);
void stream_session_init_fifos_pointers (transport_connection_t * tc,
					 u32 rx_pointer, u32 tx_pointer);

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 notify);
int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
int session_listen (stream_session_t * s, session_endpoint_cfg_t * sep);
int session_stop_listen (stream_session_t * s);
void stream_session_disconnect (stream_session_t * s);
void stream_session_disconnect_transport (stream_session_t * s);
void stream_session_cleanup (stream_session_t * s);
int session_send_io_evt_to_thread (svm_fifo_t * f,
				   session_evt_type_t evt_type);
int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
					  session_evt_type_t evt_type);
void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
				     void *rpc_args);

ssvm_private_t *session_manager_get_evt_q_segment (void);

u8 *format_stream_session (u8 * s, va_list * args);
uword unformat_stream_session (unformat_input_t * input, va_list * args);
uword unformat_transport_connection (unformat_input_t * input,
				     va_list * args);

void session_register_transport (transport_proto_t transport_proto,
				 const transport_proto_vft_t * vft, u8 is_ip4,
				 u32 output_node);

always_inline void
transport_add_tx_event (transport_connection_t * tc)
{
  stream_session_t *s = session_get (tc->s_index, tc->thread_index);
  if (svm_fifo_has_event (s->server_tx_fifo))
    return;
  session_send_io_evt_to_thread (s->server_tx_fifo, FIFO_EVENT_APP_TX);
}

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

always_inline svm_msg_q_t *
session_manager_get_vpp_event_queue (u32 thread_index)
{
  return session_manager_main.wrk[thread_index].vpp_event_queue;
}

int session_manager_flush_enqueue_events (u8 proto, u32 thread_index);
int session_manager_flush_all_enqueue_events (u8 transport_proto);

always_inline u64
listen_session_get_handle (stream_session_t * s)
{
  ASSERT (s->session_state == SESSION_STATE_LISTENING);
  return session_handle (s);
}

always_inline stream_session_t *
listen_session_get_from_handle (session_handle_t handle)
{
  return session_get_from_handle (handle);
}

always_inline void
listen_session_parse_handle (session_handle_t handle, u32 * index,
			     u32 * thread_index)
{
  session_parse_handle (handle, index, thread_index);
}

always_inline stream_session_t *
listen_session_new (u8 thread_index, session_type_t type)
{
  stream_session_t *s;
  s = session_alloc (thread_index);
  s->session_type = type;
  s->session_state = SESSION_STATE_LISTENING;
  return s;
}

always_inline stream_session_t *
listen_session_get (u32 index)
{
  return session_get (index, 0);
}

always_inline void
listen_session_del (stream_session_t * s)
{
  session_free (s);
}

transport_connection_t *listen_session_get_transport (stream_session_t * s);

int
listen_session_get_local_session_endpoint (stream_session_t * listener,
					   session_endpoint_t * sep);

void session_flush_frames_main_thread (vlib_main_t * vm);

always_inline u8
session_manager_is_enabled ()
{
  return session_manager_main.is_enabled == 1;
}

#define session_cli_return_if_not_enabled()				\
do {									\
    if (!session_manager_main.is_enabled)				\
      return clib_error_return(0, "session layer is not enabled");	\
} while (0)

void session_node_enable_disable (u8 is_en);

#endif /* __included_session_h__ */

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