summaryrefslogtreecommitdiffstats
path: root/src/vnet/session/transport.c
blob: c8c58357afdd77af631a2dd236e10d6c8f6d65e7 (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
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
/*
 * Copyright (c) 2017-2019 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.
 */

#include <vnet/session/transport.h>
#include <vnet/session/session.h>
#include <vnet/fib/fib.h>

/**
 * Per-type vector of transport protocol virtual function tables
 */
transport_proto_vft_t *tp_vfts;

/*
 * Port allocator seed
 */
static u32 port_allocator_seed;

/*
 * Local endpoints table
 */
static transport_endpoint_table_t local_endpoints_table;

/*
 * Pool of local endpoints
 */
static transport_endpoint_t *local_endpoints;

/*
 * Local endpoints pool lock
 */
static clib_spinlock_t local_endpoints_lock;

u8 *
format_transport_proto (u8 * s, va_list * args)
{
  u32 transport_proto = va_arg (*args, u32);
  switch (transport_proto)
    {
#define _(sym, str, sstr) 			\
    case TRANSPORT_PROTO_ ## sym:		\
      s = format (s, str);			\
      break;
      foreach_transport_proto
#undef _
    default:
      s = format (s, "UNKNOWN");
      break;
    }
  return s;
}

u8 *
format_transport_proto_short (u8 * s, va_list * args)
{
  u32 transport_proto = va_arg (*args, u32);
  switch (transport_proto)
    {
#define _(sym, str, sstr) 			\
    case TRANSPORT_PROTO_ ## sym:		\
      s = format (s, sstr);			\
      break;
      foreach_transport_proto
#undef _
    default:
      s = format (s, "?");
      break;
    }
  return s;
}

u8 *
format_transport_connection (u8 * s, va_list * args)
{
  u32 transport_proto = va_arg (*args, u32);
  u32 conn_index = va_arg (*args, u32);
  u32 thread_index = va_arg (*args, u32);
  u32 verbose = va_arg (*args, u32);
  transport_proto_vft_t *tp_vft;
  transport_connection_t *tc;
  u32 indent;

  tp_vft = transport_protocol_get_vft (transport_proto);
  if (!tp_vft)
    return s;

  s = format (s, "%U", tp_vft->format_connection, conn_index, thread_index,
	      verbose);
  tc = tp_vft->get_connection (conn_index, thread_index);
  if (tc && transport_connection_is_tx_paced (tc) && verbose > 1)
    {
      indent = format_get_indent (s) + 1;
      s = format (s, "%Upacer: %U\n", format_white_space, indent,
		  format_transport_pacer, &tc->pacer, tc->thread_index);
    }
  return s;
}

u8 *
format_transport_listen_connection (u8 * s, va_list * args)
{
  u32 transport_proto = va_arg (*args, u32);
  transport_proto_vft_t *tp_vft;

  tp_vft = transport_protocol_get_vft (transport_proto);
  if (!tp_vft)
    return s;

  s = (tp_vft->format_listener) (s, args);
  return s;
}

u8 *
format_transport_half_open_connection (u8 * s, va_list * args)
{
  u32 transport_proto = va_arg (*args, u32);
  u32 listen_index = va_arg (*args, u32);
  transport_proto_vft_t *tp_vft;

  tp_vft = transport_protocol_get_vft (transport_proto);
  if (!tp_vft)
    return s;

  s = format (s, "%U", tp_vft->format_half_open, listen_index);
  return s;
}

static u8
unformat_transport_str_match (unformat_input_t * input, const char *str)
{
  int i;

  if (strlen (str) > vec_len (input->buffer) - input->index)
    return 0;

  for (i = 0; i < strlen (str); i++)
    {
      if (input->buffer[i + input->index] != str[i])
	return 0;
    }
  return 1;
}

uword
unformat_transport_proto (unformat_input_t * input, va_list * args)
{
  u32 *proto = va_arg (*args, u32 *);
  u8 longest_match = 0, match;
  char *str_match = 0;

#define _(sym, str, sstr)						\
  if (unformat_transport_str_match (input, str))			\
    {									\
      match = strlen (str);						\
      if (match > longest_match)					\
	{								\
	  *proto = TRANSPORT_PROTO_ ## sym;				\
	  longest_match = match;					\
	  str_match = str;						\
	}								\
    }
  foreach_transport_proto
#undef _
    if (longest_match)
    {
      unformat (input, str_match);
      return 1;
    }

  return 0;
}

u32
transport_endpoint_lookup (transport_endpoint_table_t * ht, u8 proto,
			   ip46_address_t * ip, u16 port)
{
  clib_bihash_kv_24_8_t kv;
  int rv;

  kv.key[0] = ip->as_u64[0];
  kv.key[1] = ip->as_u64[1];
  kv.key[2] = (u64) port << 8 | (u64) proto;

  rv = clib_bihash_search_inline_24_8 (ht, &kv);
  if (rv == 0)
    return kv.value;

  return ENDPOINT_INVALID_INDEX;
}

void
transport_endpoint_table_add (transport_endpoint_table_t * ht, u8 proto,
			      transport_endpoint_t * te, u32 value)
{
  clib_bihash_kv_24_8_t kv;

  kv.key[0] = te->ip.as_u64[0];
  kv.key[1] = te->ip.as_u64[1];
  kv.key[2] = (u64) te->port << 8 | (u64) proto;
  kv.value = value;

  clib_bihash_add_del_24_8 (ht, &kv, 1);
}

void
transport_endpoint_table_del (transport_endpoint_table_t * ht, u8 proto,
			      transport_endpoint_t * te)
{
  clib_bihash_kv_24_8_t kv;

  kv.key[0] = te->ip.as_u64[0];
  kv.key[1] = te->ip.as_u64[1];
  kv.key[2] = (u64) te->port << 8 | (u64) proto;

  clib_bihash_add_del_24_8 (ht, &kv, 0);
}

/**
 * Register transport virtual function table.
 *
 * @param transport_proto - transport protocol type (i.e., TCP, UDP ..)
 * @param vft - virtual function table for transport proto
 * @param fib_proto - network layer protocol
 * @param output_node - output node index that session layer will hand off
 * 			buffers to, for requested fib proto
 */
void
transport_register_protocol (transport_proto_t transport_proto,
			     const transport_proto_vft_t * vft,
			     fib_protocol_t fib_proto, u32 output_node)
{
  u8 is_ip4 = fib_proto == FIB_PROTOCOL_IP4;

  vec_validate (tp_vfts, transport_proto);
  tp_vfts[transport_proto] = *vft;

  session_register_transport (transport_proto, vft, is_ip4, output_node);
}

/**
 * Get transport virtual function table
 *
 * @param type - session type (not protocol type)
 */
transport_proto_vft_t *
transport_protocol_get_vft (transport_proto_t transport_proto)
{
  if (transport_proto >= vec_len (tp_vfts))
    return 0;
  return &tp_vfts[transport_proto];
}

u8
transport_half_open_has_fifos (transport_proto_t tp)
{
  return tp_vfts[tp].transport_options.half_open_has_fifos;
}

transport_service_type_t
transport_protocol_service_type (transport_proto_t tp)
{
  return tp_vfts[tp].transport_options.service_type;
}

transport_tx_fn_type_t
transport_protocol_tx_fn_type (transport_proto_t tp)
{
  return tp_vfts[tp].transport_options.tx_type;
}

void
transport_cleanup (transport_proto_t tp, u32 conn_index, u8 thread_index)
{
  tp_vfts[tp].cleanup (conn_index, thread_index);
}

int
transport_connect (transport_proto_t tp, transport_endpoint_cfg_t * tep)
{
  return tp_vfts[tp].connect (tep);
}

void
transport_close (transport_proto_t tp, u32 conn_index, u8 thread_index)
{
  tp_vfts[tp].close (conn_index, thread_index);
}

void
transport_reset (transport_proto_t tp, u32 conn_index, u8 thread_index)
{
  if (tp_vfts[tp].reset)
    tp_vfts[tp].reset (conn_index, thread_index);
  else
    tp_vfts[tp].close (conn_index, thread_index);
}

u32
transport_start_listen (transport_proto_t tp, u32 session_index,
			transport_endpoint_t * tep)
{
  return tp_vfts[tp].start_listen (session_index, tep);
}

u32
transport_stop_listen (transport_proto_t tp, u32 conn_index)
{
  return tp_vfts[tp].stop_listen (conn_index);
}

u8
transport_protocol_is_cl (transport_proto_t tp)
{
  return (tp_vfts[tp].transport_options.service_type == TRANSPORT_SERVICE_CL);
}

always_inline void
default_get_transport_endpoint (transport_connection_t * tc,
				transport_endpoint_t * tep, u8 is_lcl)
{
  if (is_lcl)
    {
      tep->port = tc->lcl_port;
      tep->is_ip4 = tc->is_ip4;
      clib_memcpy_fast (&tep->ip, &tc->lcl_ip, sizeof (tc->lcl_ip));
    }
  else
    {
      tep->port = tc->rmt_port;
      tep->is_ip4 = tc->is_ip4;
      clib_memcpy_fast (&tep->ip, &tc->rmt_ip, sizeof (tc->rmt_ip));
    }
}

void
transport_get_endpoint (transport_proto_t tp, u32 conn_index,
			u32 thread_index, transport_endpoint_t * tep,
			u8 is_lcl)
{
  if (tp_vfts[tp].get_transport_endpoint)
    tp_vfts[tp].get_transport_endpoint (conn_index, thread_index, tep,
					is_lcl);
  else
    {
      transport_connection_t *tc;
      tc = transport_get_connection (tp, conn_index, thread_index);
      default_get_transport_endpoint (tc, tep, is_lcl);
    }
}

void
transport_get_listener_endpoint (transport_proto_t tp, u32 conn_index,
				 transport_endpoint_t * tep, u8 is_lcl)
{
  if (tp_vfts[tp].get_transport_listener_endpoint)
    tp_vfts[tp].get_transport_listener_endpoint (conn_index, tep, is_lcl);
  else
    {
      transport_connection_t *tc;
      tc = transport_get_listener (tp, conn_index);
      default_get_transport_endpoint (tc, tep, is_lcl);
    }
}

#define PORT_MASK ((1 << 16)- 1)

void
transport_endpoint_del (u32 tepi)
{
  clib_spinlock_lock_if_init (&local_endpoints_lock);
  pool_put_index (local_endpoints, tepi);
  clib_spinlock_unlock_if_init (&local_endpoints_lock);
}

always_inline transport_endpoint_t *
transport_endpoint_new (void)
{
  transport_endpoint_t *tep;
  pool_get_zero (local_endpoints, tep);
  return tep;
}

void
transport_endpoint_cleanup (u8 proto, ip46_address_t * lcl_ip, u16 port)
{
  u32 tepi;
  transport_endpoint_t *tep;

  /* Cleanup local endpoint if this was an active connect */
  tepi = transport_endpoint_lookup (&local_endpoints_table, proto, lcl_ip,
				    clib_net_to_host_u16 (port));
  if (tepi != ENDPOINT_INVALID_INDEX)
    {
      tep = pool_elt_at_index (local_endpoints, tepi);
      transport_endpoint_table_del (&local_endpoints_table, proto, tep);
      transport_endpoint_del (tepi);
    }
}

static void
transport_endpoint_mark_used (u8 proto, ip46_address_t * ip, u16 port)
{
  transport_endpoint_t *tep;
  clib_spinlock_lock_if_init (&local_endpoints_lock);
  tep = transport_endpoint_new ();
  clib_memcpy_fast (&tep->ip, ip, sizeof (*ip));
  tep->port = port;
  transport_endpoint_table_add (&local_endpoints_table, proto, tep,
				tep - local_endpoints);
  clib_spinlock_unlock_if_init (&local_endpoints_lock);
}

/**
 * Allocate local port and add if successful add entry to local endpoint
 * table to mark the pair as used.
 */
int
transport_alloc_local_port (u8 proto, ip46_address_t * ip)
{
  u16 min = 1024, max = 65535;	/* XXX configurable ? */
  int tries, limit;
  u32 tei;

  limit = max - min;

  /* Only support active opens from thread 0 */
  ASSERT (vlib_get_thread_index () == 0);

  /* Search for first free slot */
  for (tries = 0; tries < limit; tries++)
    {
      u16 port = 0;

      /* Find a port in the specified range */
      while (1)
	{
	  port = random_u32 (&port_allocator_seed) & PORT_MASK;
	  if (PREDICT_TRUE (port >= min && port < max))
	    break;
	}

      /* Look it up. If not found, we're done */
      tei = transport_endpoint_lookup (&local_endpoints_table, proto, ip,
				       port);
      if (tei == ENDPOINT_INVALID_INDEX)
	{
	  transport_endpoint_mark_used (proto, ip, port);
	  return port;
	}
    }
  return -1;
}

static clib_error_t *
transport_get_interface_ip (u32 sw_if_index, u8 is_ip4, ip46_address_t * addr)
{
  if (is_ip4)
    {
      ip4_address_t *ip4;
      ip4 = ip_interface_get_first_ip (sw_if_index, 1);
      if (!ip4)
	return clib_error_return (0, "no routable ip4 address on %U",
				  format_vnet_sw_if_index_name,
				  vnet_get_main (), sw_if_index);
      addr->ip4.as_u32 = ip4->as_u32;
    }
  else
    {
      ip6_address_t *ip6;
      ip6 = ip_interface_get_first_ip (sw_if_index, 0);
      if (ip6 == 0)
	return clib_error_return (0, "no routable ip6 addresses on %U",
				  format_vnet_sw_if_index_name,
				  vnet_get_main (), sw_if_index);
      clib_memcpy_fast (&addr->ip6, ip6, sizeof (*ip6));
    }
  return 0;
}

static clib_error_t *
transport_find_local_ip_for_remote (u32 sw_if_index,
				    transport_endpoint_t * rmt,
				    ip46_address_t * lcl_addr)
{
  fib_node_index_t fei;
  fib_prefix_t prefix;

  if (sw_if_index == ENDPOINT_INVALID_INDEX)
    {
      /* Find a FIB path to the destination */
      clib_memcpy_fast (&prefix.fp_addr, &rmt->ip, sizeof (rmt->ip));
      prefix.fp_proto = rmt->is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
      prefix.fp_len = rmt->is_ip4 ? 32 : 128;

      ASSERT (rmt->fib_index != ENDPOINT_INVALID_INDEX);
      fei = fib_table_lookup (rmt->fib_index, &prefix);

      /* Couldn't find route to destination. Bail out. */
      if (fei == FIB_NODE_INDEX_INVALID)
	return clib_error_return (0, "no route to %U", format_ip46_address,
				  &rmt->ip, (rmt->is_ip4 == 0) + 1);

      sw_if_index = fib_entry_get_resolving_interface (fei);
      if (sw_if_index == ENDPOINT_INVALID_INDEX)
	return clib_error_return (0, "no resolving interface for %U",
				  format_ip46_address, &rmt->ip,
				  (rmt->is_ip4 == 0) + 1);
    }

  clib_memset (lcl_addr, 0, sizeof (*lcl_addr));
  return transport_get_interface_ip (sw_if_index, rmt->is_ip4, lcl_addr);
}

int
transport_alloc_local_endpoint (u8 proto, transport_endpoint_cfg_t * rmt_cfg,
				ip46_address_t * lcl_addr, u16 * lcl_port)
{
  transport_endpoint_t *rmt = (transport_endpoint_t *) rmt_cfg;
  clib_error_t *error;
  int port;
  u32 tei;

  /*
   * Find the local address
   */
  if (ip_is_zero (&rmt_cfg->peer.ip, rmt_cfg->peer.is_ip4))
    {
      error = transport_find_local_ip_for_remote (rmt_cfg->peer.sw_if_index,
						  rmt, lcl_addr);
      if (error)
	{
	  clib_error_report (error);
	  return -1;
	}
    }
  else
    {
      /* Assume session layer vetted this address */
      clib_memcpy_fast (lcl_addr, &rmt_cfg->peer.ip,
			sizeof (rmt_cfg->peer.ip));
    }

  /*
   * Allocate source port
   */
  if (rmt_cfg->peer.port == 0)
    {
      port = transport_alloc_local_port (proto, lcl_addr);
      if (port < 1)
	{
	  clib_warning ("Failed to allocate src port");
	  return -1;
	}
      *lcl_port = port;
    }
  else
    {
      port = clib_net_to_host_u16 (rmt_cfg->peer.port);
      tei = transport_endpoint_lookup (&local_endpoints_table, proto,
				       lcl_addr, port);
      if (tei != ENDPOINT_INVALID_INDEX)
	return -1;

      transport_endpoint_mark_used (proto, lcl_addr, port);
      *lcl_port = port;
    }

  return 0;
}

u8 *
format_clib_us_time (u8 * s, va_list * args)
{
  clib_us_time_t t = va_arg (*args, clib_us_time_t);
  if (t < 1e3)
    s = format (s, "%u us", t);
  else
    s = format (s, "%.3f s", (f64) t * CLIB_US_TIME_PERIOD);
  return s;
}

u8 *
format_transport_pacer (u8 * s, va_list * args)
{
  spacer_t *pacer = va_arg (*args, spacer_t *);
  u32 thread_index = va_arg (*args, int);
  clib_us_time_t now, diff;

  now = transport_us_time_now (thread_index);
  diff = now - pacer->last_update;
  s = format (s, "rate %lu bucket %lu t/p %.3f last_update %U idle %u",
	      pacer->bytes_per_sec, pacer->bucket, pacer->tokens_per_period,
	      format_clib_us_time, diff, pacer->idle_timeout_us);
  return s;
}

static inline u32
spacer_max_burst (spacer_t * pacer, clib_us_time_t time_now)
{
  u64 n_periods = (time_now - pacer->last_update);
  u64 inc;

  if (PREDICT_FALSE (n_periods > pacer->idle_timeout_us))
    {
      pacer->last_update = time_now;
      pacer->bucket = TRANSPORT_PACER_MIN_BURST;
      return TRANSPORT_PACER_MIN_BURST;
    }

  if ((inc = (f32) n_periods * pacer->tokens_per_period) > 10)
    {
      pacer->last_update = time_now;
      pacer->bucket = clib_min (pacer->bucket + inc, pacer->bytes_per_sec);
    }

  return clib_min (pacer->bucket, TRANSPORT_PACER_MAX_BURST);
}

static inline void
spacer_update_bucket (spacer_t * pacer, u32 bytes)
{
  ASSERT (pacer->bucket >= bytes);
  pacer->bucket -= bytes;
}

static inline void
spacer_set_pace_rate (spacer_t * pacer, u64 rate_bytes_per_sec,
		      clib_us_time_t rtt)
{
  ASSERT (rate_bytes_per_sec != 0);
  pacer->bytes_per_sec = rate_bytes_per_sec;
  pacer->tokens_per_period = rate_bytes_per_sec * CLIB_US_TIME_PERIOD;
  pacer->idle_timeout_us = clib_max (rtt * TRANSPORT_PACER_IDLE_FACTOR,
				     TRANSPORT_PACER_MIN_IDLE);
}

static inline u64
spacer_pace_rate (spacer_t * pacer)
{
  return pacer->bytes_per_sec;
}

static inline void
spacer_reset (spacer_t * pacer, clib_us_time_t time_now, u64 bucket)
{
  pacer->last_update = time_now;
  pacer->bucket = bucket;
}

void
transport_connection_tx_pacer_reset (transport_connection_t * tc,
				     u64 rate_bytes_per_sec, u32 start_bucket,
				     clib_us_time_t rtt)
{
  spacer_set_pace_rate (&tc->pacer, rate_bytes_per_sec, rtt);
  spacer_reset (&tc->pacer, transport_us_time_now (tc->thread_index),
		start_bucket);
}

void
transport_connection_tx_pacer_reset_bucket (transport_connection_t * tc,
					    u32 bucket)
{
  spacer_reset (&tc->pacer, transport_us_time_now (tc->thread_index), bucket);
}

void
transport_connection_tx_pacer_init (transport_connection_t * tc,
				    u64 rate_bytes_per_sec,
				    u32 initial_bucket)
{
  tc->flags |= TRANSPORT_CONNECTION_F_IS_TX_PACED;
  transport_connection_tx_pacer_reset (tc, rate_bytes_per_sec,
				       initial_bucket, 1e6);
}

void
transport_connection_tx_pacer_update (transport_connection_t * tc,
				      u64 bytes_per_sec, clib_us_time_t rtt)
{
  spacer_set_pace_rate (&tc->pacer, bytes_per_sec, rtt);
}

u32
transport_connection_tx_pacer_burst (transport_connection_t * tc)
{
  return spacer_max_burst (&tc->pacer,
			   transport_us_time_now (tc->thread_index));
}

u64
transport_connection_tx_pacer_rate (transport_connection_t * tc)
{
  return spacer_pace_rate (&tc->pacer);
}

void
transport_connection_update_tx_bytes (transport_connection_t * tc, u32 bytes)
{
  if (transport_connection_is_tx_paced (tc))
    spacer_update_bucket (&tc->pacer, bytes);
}

void
transport_connection_tx_pacer_update_bytes (transport_connection_t * tc,
					    u32 bytes)
{
  spacer_update_bucket (&tc->pacer, bytes);
}

void
transport_update_time (clib_time_type_t time_now, u8 thread_index)
{
  transport_proto_vft_t *vft;
  vec_foreach (vft, tp_vfts)
  {
    if (vft->update_time)
      (vft->update_time) (time_now, thread_index);
  }
}

void
transport_enable_disable (vlib_main_t * vm, u8 is_en)
{
  transport_proto_vft_t *vft;
  vec_foreach (vft, tp_vfts)
  {
    if (vft->enable)
      (vft->enable) (vm, is_en);
  }
}

void
transport_init (void)
{
  vlib_thread_main_t *vtm = vlib_get_thread_main ();
  session_main_t *smm = vnet_get_session_main ();
  u32 num_threads;

  if (smm->local_endpoints_table_buckets == 0)
    smm->local_endpoints_table_buckets = 250000;
  if (smm->local_endpoints_table_memory == 0)
    smm->local_endpoints_table_memory = 512 << 20;

  /* Initialize [port-allocator] random number seed */
  port_allocator_seed = (u32) clib_cpu_time_now ();

  clib_bihash_init_24_8 (&local_endpoints_table, "local endpoints table",
			 smm->local_endpoints_table_buckets,
			 smm->local_endpoints_table_memory);
  num_threads = 1 /* main thread */  + vtm->n_threads;
  if (num_threads > 1)
    clib_spinlock_init (&local_endpoints_lock);
}

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