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Vector Packet Processing
tcp.c
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1 /*
2  * Copyright (c) 2016 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 /**
17  * @file
18  * @brief TCP host stack utilities
19  */
20 
21 #include <vnet/tcp/tcp.h>
22 #include <vnet/session/session.h>
23 #include <vnet/fib/fib.h>
24 #include <vnet/dpo/load_balance.h>
25 #include <vnet/dpo/receive_dpo.h>
26 #include <vnet/ip/ip6_neighbor.h>
27 #include <math.h>
28 
30 
31 typedef struct
32 {
35  ip46_address_t ip;
39 
40 static void
42 {
43  u32 ai;
44  if (args->is_add)
45  {
46  adj_nbr_add_or_lock (args->nh_proto, args->link_type, &args->ip,
47  args->sw_if_index);
48  }
49  else
50  {
52  args->sw_if_index);
53  if (ai != ADJ_INDEX_INVALID)
54  adj_unlock (ai);
55  }
56 }
57 
58 static void
60 {
61  tcp_add_del_adj_args_t args = {
63  .link_type = VNET_LINK_IP6,
64  .ip = tc->c_rmt_ip,
65  .sw_if_index = tc->sw_if_index,
66  .is_add = is_add
67  };
69  sizeof (args));
70 }
71 
72 static u32
74 {
75  tcp_main_t *tm = &tcp_main;
76  tcp_connection_t *listener;
77  void *iface_ip;
78 
79  pool_get (tm->listener_pool, listener);
80  memset (listener, 0, sizeof (*listener));
81 
82  listener->c_c_index = listener - tm->listener_pool;
83  listener->c_lcl_port = lcl->port;
84 
85  /* If we are provided a sw_if_index, bind using one of its ips */
86  if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX)
87  {
88  if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index,
89  lcl->is_ip4)))
90  ip_set (&lcl->ip, iface_ip, lcl->is_ip4);
91  }
92  ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4);
93  listener->c_is_ip4 = lcl->is_ip4;
94  listener->c_proto = TRANSPORT_PROTO_TCP;
95  listener->c_s_index = session_index;
96  listener->c_fib_index = lcl->fib_index;
97  listener->state = TCP_STATE_LISTEN;
98 
99  tcp_connection_timers_init (listener);
100 
101  TCP_EVT_DBG (TCP_EVT_BIND, listener);
102 
103  return listener->c_c_index;
104 }
105 
106 static u32
108 {
109  return tcp_connection_bind (session_index, tep);
110 }
111 
112 static void
113 tcp_connection_unbind (u32 listener_index)
114 {
115  tcp_main_t *tm = vnet_get_tcp_main ();
116  tcp_connection_t *tc;
117 
118  tc = pool_elt_at_index (tm->listener_pool, listener_index);
119 
120  TCP_EVT_DBG (TCP_EVT_UNBIND, tc);
121 
122  /* Poison the entry */
123  if (CLIB_DEBUG > 0)
124  memset (tc, 0xFA, sizeof (*tc));
125 
126  pool_put_index (tm->listener_pool, listener_index);
127 }
128 
129 static u32
130 tcp_session_unbind (u32 listener_index)
131 {
132  tcp_connection_unbind (listener_index);
133  return 0;
134 }
135 
136 static transport_connection_t *
138 {
139  tcp_main_t *tm = vnet_get_tcp_main ();
140  tcp_connection_t *tc;
141  tc = pool_elt_at_index (tm->listener_pool, listener_index);
142  return &tc->connection;
143 }
144 
145 /**
146  * Cleanup half-open connection
147  *
148  */
149 static void
151 {
152  tcp_main_t *tm = vnet_get_tcp_main ();
153  clib_spinlock_lock_if_init (&tm->half_open_lock);
154  pool_put_index (tm->half_open_connections, tc->c_c_index);
155  if (CLIB_DEBUG)
156  memset (tc, 0xFA, sizeof (*tc));
157  clib_spinlock_unlock_if_init (&tm->half_open_lock);
158 }
159 
160 /**
161  * Try to cleanup half-open connection
162  *
163  * If called from a thread that doesn't own tc, the call won't have any
164  * effect.
165  *
166  * @param tc - connection to be cleaned up
167  * @return non-zero if cleanup failed.
168  */
169 int
171 {
172  /* Make sure this is the owning thread */
173  if (tc->c_thread_index != vlib_get_thread_index ())
174  return 1;
175  tcp_timer_reset (tc, TCP_TIMER_ESTABLISH);
176  tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT_SYN);
178  return 0;
179 }
180 
181 static tcp_connection_t *
183 {
184  tcp_main_t *tm = vnet_get_tcp_main ();
185  tcp_connection_t *tc = 0;
186  ASSERT (vlib_get_thread_index () == 0);
187  pool_get (tm->half_open_connections, tc);
188  memset (tc, 0, sizeof (*tc));
189  tc->c_c_index = tc - tm->half_open_connections;
190  return tc;
191 }
192 
193 /**
194  * Cleans up connection state.
195  *
196  * No notifications.
197  */
198 void
200 {
201  tcp_main_t *tm = &tcp_main;
202 
203  /* Cleanup local endpoint if this was an active connect */
205  tc->c_lcl_port);
206 
207  /* Check if connection is not yet fully established */
208  if (tc->state == TCP_STATE_SYN_SENT)
209  {
210  /* Try to remove the half-open connection. If this is not the owning
211  * thread, tc won't be removed. Retransmit or establish timers will
212  * eventually expire and call again cleanup on the right thread. */
214  }
215  else
216  {
217  int thread_index = tc->c_thread_index;
218 
219  /* Make sure all timers are cleared */
221 
222  if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
223  tcp_add_del_adjacency (tc, 0);
224 
225  /* Poison the entry */
226  if (CLIB_DEBUG > 0)
227  memset (tc, 0xFA, sizeof (*tc));
228  pool_put (tm->connections[thread_index], tc);
229  }
230 }
231 
232 /**
233  * Connection removal.
234  *
235  * This should be called only once connection enters CLOSED state. Note
236  * that it notifies the session of the removal event, so if the goal is to
237  * just remove the connection, call tcp_connection_cleanup instead.
238  */
239 void
241 {
242  TCP_EVT_DBG (TCP_EVT_DELETE, tc);
243  stream_session_delete_notify (&tc->connection);
245 }
246 
248 tcp_connection_new (u8 thread_index)
249 {
250  tcp_main_t *tm = vnet_get_tcp_main ();
251  tcp_connection_t *tc;
252 
253  pool_get (tm->connections[thread_index], tc);
254  memset (tc, 0, sizeof (*tc));
255  tc->c_c_index = tc - tm->connections[thread_index];
256  tc->c_thread_index = thread_index;
257  return tc;
258 }
259 
260 /** Notify session that connection has been reset.
261  *
262  * Switch state to closed and wait for session to call cleanup.
263  */
264 void
266 {
267  TCP_EVT_DBG (TCP_EVT_RST_RCVD, tc);
268  switch (tc->state)
269  {
270  case TCP_STATE_SYN_RCVD:
271  /* Cleanup everything. App wasn't notified yet */
272  stream_session_delete_notify (&tc->connection);
274  break;
275  case TCP_STATE_SYN_SENT:
276  session_stream_connect_notify (&tc->connection, 1 /* fail */ );
278  break;
279  case TCP_STATE_ESTABLISHED:
281  /* Set the cleanup timer, in case the session layer/app don't
282  * cleanly close the connection */
283  tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
284  stream_session_reset_notify (&tc->connection);
285  break;
286  case TCP_STATE_CLOSE_WAIT:
287  case TCP_STATE_FIN_WAIT_1:
288  case TCP_STATE_FIN_WAIT_2:
289  case TCP_STATE_CLOSING:
290  tc->state = TCP_STATE_CLOSED;
291  TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc);
293  tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
294  break;
295  case TCP_STATE_CLOSED:
296  return;
297  }
298 }
299 
300 /**
301  * Begin connection closing procedure.
302  *
303  * If at the end the connection is not in CLOSED state, it is not removed.
304  * Instead, we rely on on TCP to advance through state machine to either
305  * 1) LAST_ACK (passive close) whereby when the last ACK is received
306  * tcp_connection_del is called. This notifies session of the delete and
307  * calls cleanup.
308  * 2) TIME_WAIT (active close) whereby after 2MSL the 2MSL timer triggers
309  * and cleanup is called.
310  *
311  * N.B. Half-close connections are not supported
312  */
313 void
315 {
316  TCP_EVT_DBG (TCP_EVT_CLOSE, tc);
317 
318  /* Send/Program FIN if needed and switch state */
319  switch (tc->state)
320  {
321  case TCP_STATE_SYN_SENT:
322  tc->state = TCP_STATE_CLOSED;
323  break;
324  case TCP_STATE_SYN_RCVD:
325  tcp_send_fin (tc);
326  tc->state = TCP_STATE_FIN_WAIT_1;
327  break;
328  case TCP_STATE_ESTABLISHED:
329  if (!session_tx_fifo_max_dequeue (&tc->connection))
330  tcp_send_fin (tc);
331  else
332  tc->flags |= TCP_CONN_FINPNDG;
333  tc->state = TCP_STATE_FIN_WAIT_1;
334  break;
335  case TCP_STATE_CLOSE_WAIT:
336  if (!session_tx_fifo_max_dequeue (&tc->connection))
337  {
338  tcp_send_fin (tc);
340  tc->state = TCP_STATE_LAST_ACK;
341  tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
342  }
343  else
344  tc->flags |= TCP_CONN_FINPNDG;
345  break;
346  case TCP_STATE_FIN_WAIT_1:
347  tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
348  break;
349  default:
350  TCP_DBG ("state: %u", tc->state);
351  }
352 
353  TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc);
354 
355  /* If in CLOSED and WAITCLOSE timer is not set, delete connection now */
356  if (!tcp_timer_is_active (tc, TCP_TIMER_WAITCLOSE)
357  && tc->state == TCP_STATE_CLOSED)
358  tcp_connection_del (tc);
359 }
360 
361 static void
362 tcp_session_close (u32 conn_index, u32 thread_index)
363 {
364  tcp_connection_t *tc;
365  tc = tcp_connection_get (conn_index, thread_index);
367 }
368 
369 static void
370 tcp_session_cleanup (u32 conn_index, u32 thread_index)
371 {
372  tcp_connection_t *tc;
373  tc = tcp_connection_get (conn_index, thread_index);
375  tc->state = TCP_STATE_CLOSED;
376  TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc);
378 }
379 
380 /**
381  * Initialize all connection timers as invalid
382  */
383 void
385 {
386  int i;
387 
388  /* Set all to invalid */
389  for (i = 0; i < TCP_N_TIMERS; i++)
390  {
391  tc->timers[i] = TCP_TIMER_HANDLE_INVALID;
392  }
393 
394  tc->rto = TCP_RTO_INIT;
395 }
396 
397 /**
398  * Stop all connection timers
399  */
400 void
402 {
403  int i;
404  for (i = 0; i < TCP_N_TIMERS; i++)
405  {
406  tcp_timer_reset (tc, i);
407  }
408 }
409 
410 #if 0
411 typedef struct ip4_tcp_hdr
412 {
413  ip4_header_t ip;
414  tcp_header_t tcp;
415 } ip4_tcp_hdr_t;
416 
417 typedef struct ip6_tcp_hdr
418 {
419  ip6_header_t ip;
420  tcp_header_t tcp;
421 } ip6_tcp_hdr_t;
422 
423 static void
424 tcp_connection_select_lb_bucket (tcp_connection_t * tc, const dpo_id_t * dpo,
425  dpo_id_t * result)
426 {
427  const dpo_id_t *choice;
428  load_balance_t *lb;
429  int hash;
430 
431  lb = load_balance_get (dpo->dpoi_index);
432  if (tc->c_is_ip4)
433  {
434  ip4_tcp_hdr_t hdr;
435  memset (&hdr, 0, sizeof (hdr));
436  hdr.ip.protocol = IP_PROTOCOL_TCP;
437  hdr.ip.address_pair.src.as_u32 = tc->c_lcl_ip.ip4.as_u32;
438  hdr.ip.address_pair.dst.as_u32 = tc->c_rmt_ip.ip4.as_u32;
439  hdr.tcp.src_port = tc->c_lcl_port;
440  hdr.tcp.dst_port = tc->c_rmt_port;
441  hash = ip4_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
442  }
443  else
444  {
445  ip6_tcp_hdr_t hdr;
446  memset (&hdr, 0, sizeof (hdr));
447  hdr.ip.protocol = IP_PROTOCOL_TCP;
448  clib_memcpy (&hdr.ip.src_address, &tc->c_lcl_ip.ip6,
449  sizeof (ip6_address_t));
450  clib_memcpy (&hdr.ip.dst_address, &tc->c_rmt_ip.ip6,
451  sizeof (ip6_address_t));
452  hdr.tcp.src_port = tc->c_lcl_port;
453  hdr.tcp.dst_port = tc->c_rmt_port;
454  hash = ip6_compute_flow_hash (&hdr.ip, lb->lb_hash_config);
455  }
456  choice = load_balance_get_bucket_i (lb, hash & lb->lb_n_buckets_minus_1);
457  dpo_copy (result, choice);
458 }
459 
462 {
464  u32 fib_index;
465 
466  clib_memcpy (&prefix.fp_addr, &tc->c_rmt_ip, sizeof (prefix.fp_addr));
467  prefix.fp_proto = tc->c_is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
468  prefix.fp_len = tc->c_is_ip4 ? 32 : 128;
469  fib_index = fib_table_find (prefix.fp_proto, tc->c_fib_index);
470  return fib_table_lookup (fib_index, &prefix);
471 }
472 
473 static int
474 tcp_connection_stack_on_fib_entry (tcp_connection_t * tc)
475 {
476  dpo_id_t choice = DPO_INVALID;
477  u32 output_node_index;
478  fib_entry_t *fe;
479 
480  fe = fib_entry_get (tc->c_rmt_fei);
481  if (fe->fe_lb.dpoi_type != DPO_LOAD_BALANCE)
482  return -1;
483 
484  tcp_connection_select_lb_bucket (tc, &fe->fe_lb, &choice);
485 
486  output_node_index =
487  tc->c_is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
488  dpo_stack_from_node (output_node_index, &tc->c_rmt_dpo, &choice);
489  return 0;
490 }
491 
492 /** Stack tcp connection on peer's fib entry.
493  *
494  * This ultimately populates the dpo the connection will use to send packets.
495  */
496 static void
497 tcp_connection_fib_attach (tcp_connection_t * tc)
498 {
499  tc->c_rmt_fei = tcp_lookup_rmt_in_fib (tc);
500 
501  ASSERT (tc->c_rmt_fei != FIB_NODE_INDEX_INVALID);
502 
503  tcp_connection_stack_on_fib_entry (tc);
504 }
505 #endif /* 0 */
506 
507 static void
509 {
510  tc->cc_algo = tcp_cc_algo_get (TCP_CC_NEWRENO);
511  tc->cc_algo->init (tc);
512 }
513 
514 void
516  const tcp_cc_algorithm_t * vft)
517 {
518  tcp_main_t *tm = vnet_get_tcp_main ();
519  vec_validate (tm->cc_algos, type);
520 
521  tm->cc_algos[type] = *vft;
522 }
523 
526 {
527  tcp_main_t *tm = vnet_get_tcp_main ();
528  return &tm->cc_algos[type];
529 }
530 
531 
532 /**
533  * Initialize connection send variables.
534  */
535 void
537 {
538  u32 time_now;
539 
540  /*
541  * We use the time to randomize iss and for setting up the initial
542  * timestamp. Make sure it's updated otherwise syn and ack in the
543  * handshake may make it look as if time has flown in the opposite
544  * direction for us.
545  */
547  time_now = tcp_time_now ();
548 
549  tc->iss = random_u32 (&time_now);
550  tc->snd_una = tc->iss;
551  tc->snd_nxt = tc->iss + 1;
552  tc->snd_una_max = tc->snd_nxt;
553 }
554 
555 /** Initialize tcp connection variables
556  *
557  * Should be called after having received a msg from the peer, i.e., a SYN or
558  * a SYNACK, such that connection options have already been exchanged. */
559 void
561 {
563  tcp_init_mss (tc);
564  scoreboard_init (&tc->sack_sb);
565  tcp_cc_init (tc);
566  if (tc->state == TCP_STATE_SYN_RCVD)
567  tcp_init_snd_vars (tc);
568 
569  if (!tc->c_is_ip4 && ip6_address_is_link_local_unicast (&tc->c_rmt_ip6))
570  tcp_add_del_adjacency (tc, 1);
571 
572  // tcp_connection_fib_attach (tc);
573 }
574 
575 static int
576 tcp_alloc_custom_local_endpoint (tcp_main_t * tm, ip46_address_t * lcl_addr,
577  u16 * lcl_port, u8 is_ip4)
578 {
579  int index, port;
580  if (is_ip4)
581  {
582  index = tm->last_v4_address_rotor++;
583  if (tm->last_v4_address_rotor >= vec_len (tm->ip4_src_addresses))
584  tm->last_v4_address_rotor = 0;
585  lcl_addr->ip4.as_u32 = tm->ip4_src_addresses[index].as_u32;
586  }
587  else
588  {
589  index = tm->last_v6_address_rotor++;
590  if (tm->last_v6_address_rotor >= vec_len (tm->ip6_src_addresses))
591  tm->last_v6_address_rotor = 0;
592  clib_memcpy (&lcl_addr->ip6, &tm->ip6_src_addresses[index],
593  sizeof (ip6_address_t));
594  }
596  if (port < 1)
597  {
598  clib_warning ("Failed to allocate src port");
599  return -1;
600  }
601  *lcl_port = port;
602  return 0;
603 }
604 
605 static int
607 {
608  tcp_main_t *tm = vnet_get_tcp_main ();
609  tcp_connection_t *tc;
610  ip46_address_t lcl_addr;
611  u16 lcl_port;
612  int rv;
613 
614  /*
615  * Allocate local endpoint
616  */
617  if ((rmt->is_ip4 && vec_len (tm->ip4_src_addresses))
618  || (!rmt->is_ip4 && vec_len (tm->ip6_src_addresses)))
619  rv = tcp_alloc_custom_local_endpoint (tm, &lcl_addr, &lcl_port,
620  rmt->is_ip4);
621  else
623  rmt, &lcl_addr, &lcl_port);
624 
625  if (rv)
626  return -1;
627 
628  /*
629  * Create connection and send SYN
630  */
631  clib_spinlock_lock_if_init (&tm->half_open_lock);
633  ip_copy (&tc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
634  ip_copy (&tc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
635  tc->c_rmt_port = rmt->port;
636  tc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
637  tc->c_is_ip4 = rmt->is_ip4;
638  tc->c_proto = TRANSPORT_PROTO_TCP;
639  tc->c_fib_index = rmt->fib_index;
640  /* The other connection vars will be initialized after SYN ACK */
642 
643  TCP_EVT_DBG (TCP_EVT_OPEN, tc);
644  tc->state = TCP_STATE_SYN_SENT;
645  tcp_init_snd_vars (tc);
646  tcp_send_syn (tc);
647  clib_spinlock_unlock_if_init (&tm->half_open_lock);
648 
649  return tc->c_c_index;
650 }
651 
652 static int
654 {
655  return tcp_connection_open (tep);
656 }
657 
658 const char *tcp_dbg_evt_str[] = {
659 #define _(sym, str) str,
661 #undef _
662 };
663 
664 const char *tcp_fsm_states[] = {
665 #define _(sym, str) str,
667 #undef _
668 };
669 
670 u8 *
671 format_tcp_state (u8 * s, va_list * args)
672 {
673  u32 state = va_arg (*args, u32);
674 
675  if (state < TCP_N_STATES)
676  s = format (s, "%s", tcp_fsm_states[state]);
677  else
678  s = format (s, "UNKNOWN (%d (0x%x))", state, state);
679  return s;
680 }
681 
682 const char *tcp_connection_flags_str[] = {
683 #define _(sym, str) str,
685 #undef _
686 };
687 
688 static u8 *
689 format_tcp_connection_flags (u8 * s, va_list * args)
690 {
691  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
692  int i, last = -1;
693 
694  for (i = 0; i < TCP_CONN_N_FLAG_BITS; i++)
695  if (tc->flags & (1 << i))
696  last = i;
697  for (i = 0; i < last; i++)
698  {
699  if (tc->flags & (1 << i))
700  s = format (s, "%s, ", tcp_connection_flags_str[i]);
701  }
702  if (last >= 0)
703  s = format (s, "%s", tcp_connection_flags_str[last]);
704  return s;
705 }
706 
707 const char *tcp_conn_timers[] = {
708 #define _(sym, str) str,
710 #undef _
711 };
712 
713 static u8 *
714 format_tcp_timers (u8 * s, va_list * args)
715 {
716  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
717  int i, last = -1;
718 
719  for (i = 0; i < TCP_N_TIMERS; i++)
720  if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID)
721  last = i;
722 
723  s = format (s, "[");
724  for (i = 0; i < last; i++)
725  {
726  if (tc->timers[i] != TCP_TIMER_HANDLE_INVALID)
727  s = format (s, "%s,", tcp_conn_timers[i]);
728  }
729 
730  if (last >= 0)
731  s = format (s, "%s]", tcp_conn_timers[i]);
732  else
733  s = format (s, "]");
734 
735  return s;
736 }
737 
738 static u8 *
739 format_tcp_congestion_status (u8 * s, va_list * args)
740 {
741  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
742  if (tcp_in_recovery (tc))
743  s = format (s, "recovery");
744  else if (tcp_in_fastrecovery (tc))
745  s = format (s, "fastrecovery");
746  else
747  s = format (s, "none");
748  return s;
749 }
750 
751 static i32
753 {
754  return (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las);
755 }
756 
757 static u8 *
758 format_tcp_vars (u8 * s, va_list * args)
759 {
760  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
761  s = format (s, " flags: %U timers: %U\n", format_tcp_connection_flags, tc,
762  format_tcp_timers, tc);
763  s = format (s, " snd_una %u snd_nxt %u snd_una_max %u",
764  tc->snd_una - tc->iss, tc->snd_nxt - tc->iss,
765  tc->snd_una_max - tc->iss);
766  s = format (s, " rcv_nxt %u rcv_las %u\n",
767  tc->rcv_nxt - tc->irs, tc->rcv_las - tc->irs);
768  s = format (s, " snd_wnd %u rcv_wnd %u snd_wl1 %u snd_wl2 %u\n",
769  tc->snd_wnd, tc->rcv_wnd, tc->snd_wl1 - tc->irs,
770  tc->snd_wl2 - tc->iss);
771  s = format (s, " flight size %u out space %u cc space %u rcv_wnd_av %u\n",
774  s = format (s, " cong %U ", format_tcp_congestion_status, tc);
775  s = format (s, "cwnd %u ssthresh %u rtx_bytes %u bytes_acked %u\n",
776  tc->cwnd, tc->ssthresh, tc->snd_rxt_bytes, tc->bytes_acked);
777  s = format (s, " prev_ssthresh %u snd_congestion %u dupack %u",
778  tc->prev_ssthresh, tc->snd_congestion - tc->iss,
779  tc->rcv_dupacks);
780  s = format (s, " limited_transmit %u\n", tc->limited_transmit - tc->iss);
781  s = format (s, " tsecr %u tsecr_last_ack %u\n", tc->rcv_opts.tsecr,
782  tc->tsecr_last_ack);
783  s = format (s, " rto %u rto_boff %u srtt %u rttvar %u rtt_ts %u ", tc->rto,
784  tc->rto_boff, tc->srtt, tc->rttvar, tc->rtt_ts);
785  s = format (s, "rtt_seq %u\n", tc->rtt_seq);
786  s = format (s, " tsval_recent %u tsval_recent_age %u\n", tc->tsval_recent,
787  tcp_time_now () - tc->tsval_recent_age);
788  if (tc->state >= TCP_STATE_ESTABLISHED)
789  s = format (s, " scoreboard: %U\n", format_tcp_scoreboard, &tc->sack_sb,
790  tc);
791  if (vec_len (tc->snd_sacks))
792  s = format (s, " sacks tx: %U\n", format_tcp_sacks, tc);
793 
794  return s;
795 }
796 
797 static u8 *
798 format_tcp_connection_id (u8 * s, va_list * args)
799 {
800  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
801  if (!tc)
802  return s;
803  if (tc->c_is_ip4)
804  {
805  s = format (s, "[#%d][%s] %U:%d->%U:%d", tc->c_thread_index, "T",
806  format_ip4_address, &tc->c_lcl_ip4,
807  clib_net_to_host_u16 (tc->c_lcl_port), format_ip4_address,
808  &tc->c_rmt_ip4, clib_net_to_host_u16 (tc->c_rmt_port));
809  }
810  else
811  {
812  s = format (s, "[#%d][%s] %U:%d->%U:%d", tc->c_thread_index, "T",
813  format_ip6_address, &tc->c_lcl_ip6,
814  clib_net_to_host_u16 (tc->c_lcl_port), format_ip6_address,
815  &tc->c_rmt_ip6, clib_net_to_host_u16 (tc->c_rmt_port));
816  }
817 
818  return s;
819 }
820 
821 u8 *
822 format_tcp_connection (u8 * s, va_list * args)
823 {
824  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
825  u32 verbose = va_arg (*args, u32);
826 
827  if (!tc)
828  return s;
829  s = format (s, "%-50U", format_tcp_connection_id, tc);
830  if (verbose)
831  {
832  s = format (s, "%-15U", format_tcp_state, tc->state);
833  if (verbose > 1)
834  s = format (s, "\n%U", format_tcp_vars, tc);
835  }
836 
837  return s;
838 }
839 
840 static u8 *
841 format_tcp_session (u8 * s, va_list * args)
842 {
843  u32 tci = va_arg (*args, u32);
844  u32 thread_index = va_arg (*args, u32);
845  u32 verbose = va_arg (*args, u32);
846  tcp_connection_t *tc;
847 
848  tc = tcp_connection_get (tci, thread_index);
849  if (tc)
850  s = format (s, "%U", format_tcp_connection, tc, verbose);
851  else
852  s = format (s, "empty\n");
853  return s;
854 }
855 
856 static u8 *
857 format_tcp_listener_session (u8 * s, va_list * args)
858 {
859  u32 tci = va_arg (*args, u32);
861  return format (s, "%U", format_tcp_connection_id, tc);
862 }
863 
864 static u8 *
865 format_tcp_half_open_session (u8 * s, va_list * args)
866 {
867  u32 tci = va_arg (*args, u32);
869  return format (s, "%U", format_tcp_connection_id, tc);
870 }
871 
872 u8 *
873 format_tcp_sacks (u8 * s, va_list * args)
874 {
875  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
876  sack_block_t *sacks = tc->snd_sacks;
877  sack_block_t *block;
878  int i, len = 0;
879 
880  len = vec_len (sacks);
881  for (i = 0; i < len - 1; i++)
882  {
883  block = &sacks[i];
884  s = format (s, " start %u end %u\n", block->start - tc->irs,
885  block->end - tc->irs);
886  }
887  if (len)
888  {
889  block = &sacks[len - 1];
890  s = format (s, " start %u end %u", block->start - tc->irs,
891  block->end - tc->irs);
892  }
893  return s;
894 }
895 
896 u8 *
897 format_tcp_rcv_sacks (u8 * s, va_list * args)
898 {
899  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
900  sack_block_t *sacks = tc->rcv_opts.sacks;
901  sack_block_t *block;
902  int i, len = 0;
903 
904  len = vec_len (sacks);
905  for (i = 0; i < len - 1; i++)
906  {
907  block = &sacks[i];
908  s = format (s, " start %u end %u\n", block->start - tc->iss,
909  block->end - tc->iss);
910  }
911  if (len)
912  {
913  block = &sacks[len - 1];
914  s = format (s, " start %u end %u", block->start - tc->iss,
915  block->end - tc->iss);
916  }
917  return s;
918 }
919 
920 static u8 *
921 format_tcp_sack_hole (u8 * s, va_list * args)
922 {
923  sack_scoreboard_hole_t *hole = va_arg (*args, sack_scoreboard_hole_t *);
924  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
925  if (tc)
926  s = format (s, " [%u, %u]", hole->start - tc->iss, hole->end - tc->iss);
927  else
928  s = format (s, " [%u, %u]", hole->start, hole->end);
929  return s;
930 }
931 
932 u8 *
933 format_tcp_scoreboard (u8 * s, va_list * args)
934 {
935  sack_scoreboard_t *sb = va_arg (*args, sack_scoreboard_t *);
936  tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
938  s = format (s, "sacked_bytes %u last_sacked_bytes %u lost_bytes %u\n",
939  sb->sacked_bytes, sb->last_sacked_bytes, sb->lost_bytes);
940  s = format (s, " last_bytes_delivered %u high_sacked %u snd_una_adv %u\n",
941  sb->last_bytes_delivered, sb->high_sacked, sb->snd_una_adv);
942  s = format (s, " cur_rxt_hole %u high_rxt %u rescue_rxt %u",
943  sb->cur_rxt_hole, sb->high_rxt, sb->rescue_rxt);
944 
945  hole = scoreboard_first_hole (sb);
946  if (hole)
947  s = format (s, "\n head %u tail %u holes:\n", sb->head, sb->tail);
948 
949  while (hole)
950  {
951  s = format (s, "%U", format_tcp_sack_hole, hole, tc);
952  hole = scoreboard_next_hole (sb, hole);
953  }
954 
955  return s;
956 }
957 
958 static transport_connection_t *
959 tcp_session_get_transport (u32 conn_index, u32 thread_index)
960 {
961  tcp_connection_t *tc = tcp_connection_get (conn_index, thread_index);
962  return &tc->connection;
963 }
964 
965 static transport_connection_t *
967 {
969  return &tc->connection;
970 }
971 
972 /**
973  * Compute maximum segment size for session layer.
974  *
975  * Since the result needs to be the actual data length, it first computes
976  * the tcp options to be used in the next burst and subtracts their
977  * length from the connection's snd_mss.
978  */
979 static u16
981 {
982  tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
983 
984  /* Ensure snd_mss does accurately reflect the amount of data we can push
985  * in a segment. This also makes sure that options are updated according to
986  * the current state of the connection. */
988 
989  return tc->snd_mss;
990 }
991 
994 {
995  if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
996  {
997  return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0;
998  }
999 
1000  /* If not snd_wnd constrained and we can't write at least a segment,
1001  * don't try at all */
1002  if (PREDICT_FALSE (snd_space < tc->snd_mss))
1003  return snd_space < tc->cwnd ? 0 : snd_space;
1004 
1005  /* round down to mss multiple */
1006  return snd_space - (snd_space % tc->snd_mss);
1007 }
1008 
1009 /**
1010  * Compute tx window session is allowed to fill.
1011  *
1012  * Takes into account available send space, snd_mss and the congestion
1013  * state of the connection. If possible, the value returned is a multiple
1014  * of snd_mss.
1015  *
1016  * @param tc tcp connection
1017  * @return number of bytes session is allowed to write
1018  */
1019 static u32
1021 {
1022  int snd_space, snt_limited;
1023 
1024  if (PREDICT_TRUE (tcp_in_cong_recovery (tc) == 0))
1025  {
1026  snd_space = tcp_available_output_snd_space (tc);
1027 
1028  /* If we haven't gotten dupacks or if we did and have gotten sacked
1029  * bytes then we can still send as per Limited Transmit (RFC3042) */
1030  if (PREDICT_FALSE (tc->rcv_dupacks != 0
1031  && (tcp_opts_sack_permitted (tc)
1032  && tc->sack_sb.last_sacked_bytes == 0)))
1033  {
1034  if (tc->rcv_dupacks == 1 && tc->limited_transmit != tc->snd_nxt)
1035  tc->limited_transmit = tc->snd_nxt;
1036  ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt));
1037 
1038  snt_limited = tc->snd_nxt - tc->limited_transmit;
1039  snd_space = clib_max (2 * tc->snd_mss - snt_limited, 0);
1040  }
1041  return tcp_round_snd_space (tc, snd_space);
1042  }
1043 
1044  if (tcp_in_recovery (tc))
1045  {
1046  tc->snd_nxt = tc->snd_una_max;
1047  snd_space = tcp_available_snd_wnd (tc) - tc->snd_rxt_bytes
1048  - (tc->snd_una_max - tc->snd_congestion);
1049  if (snd_space <= 0 || (tc->snd_una_max - tc->snd_una) >= tc->snd_wnd)
1050  return 0;
1051  return tcp_round_snd_space (tc, snd_space);
1052  }
1053 
1054  /* RFC 5681: When previously unsent data is available and the new value of
1055  * cwnd and the receiver's advertised window allow, a TCP SHOULD send 1*SMSS
1056  * bytes of previously unsent data. */
1058  {
1059  if (tcp_available_cc_snd_space (tc) < tc->snd_mss)
1060  return 0;
1062  return tc->snd_mss;
1063  }
1064 
1065  return 0;
1066 }
1067 
1068 static u32
1070 {
1071  tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1072  return clib_min (tcp_snd_space (tc),
1073  tc->snd_wnd - (tc->snd_nxt - tc->snd_una));
1074 }
1075 
1076 static u32
1078 {
1079  tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
1080 
1081  ASSERT (seq_geq (tc->snd_nxt, tc->snd_una));
1082 
1083  /* This still works if fast retransmit is on */
1084  return (tc->snd_nxt - tc->snd_una);
1085 }
1086 
1087 static void
1088 tcp_update_time (f64 now, u8 thread_index)
1089 {
1090  tcp_set_time_now (thread_index);
1091  tw_timer_expire_timers_16t_2w_512sl (&tcp_main.
1092  wrk_ctx[thread_index].timer_wheel,
1093  now);
1094  tcp_flush_frames_to_output (thread_index);
1095 }
1096 
1097 static u32
1099 {
1100  tcp_connection_t *tc = (tcp_connection_t *) tconn;
1101  return tcp_push_header (tc, b);
1102 }
1103 
1104 /* *INDENT-OFF* */
1106  .enable = vnet_tcp_enable_disable,
1107  .bind = tcp_session_bind,
1108  .unbind = tcp_session_unbind,
1109  .push_header = tcp_session_push_header,
1110  .get_connection = tcp_session_get_transport,
1111  .get_listener = tcp_session_get_listener,
1112  .get_half_open = tcp_half_open_session_get_transport,
1113  .open = tcp_session_open,
1114  .close = tcp_session_close,
1115  .cleanup = tcp_session_cleanup,
1116  .send_mss = tcp_session_send_mss,
1117  .send_space = tcp_session_send_space,
1118  .update_time = tcp_update_time,
1119  .tx_fifo_offset = tcp_session_tx_fifo_offset,
1120  .format_connection = format_tcp_session,
1121  .format_listener = format_tcp_listener_session,
1122  .format_half_open = format_tcp_half_open_session,
1123  .tx_type = TRANSPORT_TX_PEEK,
1124  .service_type = TRANSPORT_SERVICE_VC,
1125 };
1126 /* *INDENT-ON* */
1127 
1128 static void
1130 {
1131  u32 thread_index = vlib_get_thread_index ();
1132  tcp_connection_t *tc;
1133 
1134  tc = tcp_connection_get (conn_index, thread_index);
1135  tc->timers[TCP_TIMER_KEEP] = TCP_TIMER_HANDLE_INVALID;
1136 
1137  tcp_connection_close (tc);
1138 }
1139 
1140 static void
1142 {
1143  tcp_connection_t *tc;
1144 
1145  tc = tcp_half_open_connection_get (conn_index);
1146  if (tc)
1147  {
1148  ASSERT (tc->state == TCP_STATE_SYN_SENT);
1149  session_stream_connect_notify (&tc->connection, 1 /* fail */ );
1150  TCP_DBG ("establish pop: %U", format_tcp_connection, tc, 2);
1151  }
1152  else
1153  {
1154  tc = tcp_connection_get (conn_index, vlib_get_thread_index ());
1155  /* note: the connection may have already disappeared */
1156  if (PREDICT_FALSE (tc == 0))
1157  return;
1158  TCP_DBG ("establish pop: %U", format_tcp_connection, tc, 2);
1159  ASSERT (tc->state == TCP_STATE_SYN_RCVD);
1160  /* Start cleanup. App wasn't notified yet so use delete notify as
1161  * opposed to delete to cleanup session layer state. */
1162  stream_session_delete_notify (&tc->connection);
1163  }
1164  tc->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
1166 }
1167 
1168 static void
1170 {
1171  u32 thread_index = vlib_get_thread_index ();
1172  tcp_connection_t *tc;
1173 
1174  tc = tcp_connection_get (conn_index, thread_index);
1175  if (!tc)
1176  return;
1177  tc->timers[TCP_TIMER_WAITCLOSE] = TCP_TIMER_HANDLE_INVALID;
1178 
1179  /* Session didn't come back with a close(). Send FIN either way
1180  * and switch to LAST_ACK. */
1181  if (tc->state == TCP_STATE_CLOSE_WAIT)
1182  {
1183  if (tc->flags & TCP_CONN_FINSNT)
1184  {
1185  clib_warning ("FIN was sent and still in CLOSE WAIT. Weird!");
1186  }
1187 
1188  tcp_send_fin (tc);
1189  tc->state = TCP_STATE_LAST_ACK;
1190 
1191  /* Make sure we don't wait in LAST ACK forever */
1192  tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
1193 
1194  /* Don't delete the connection yet */
1195  return;
1196  }
1197 
1198  tcp_connection_del (tc);
1199 }
1200 
1201 /* *INDENT-OFF* */
1203 {
1211 };
1212 /* *INDENT-ON* */
1213 
1214 static void
1216 {
1217  int i;
1218  u32 connection_index, timer_id;
1219 
1220  for (i = 0; i < vec_len (expired_timers); i++)
1221  {
1222  /* Get session index and timer id */
1223  connection_index = expired_timers[i] & 0x0FFFFFFF;
1224  timer_id = expired_timers[i] >> 28;
1225 
1226  TCP_EVT_DBG (TCP_EVT_TIMER_POP, connection_index, timer_id);
1227 
1228  /* Handle expiration */
1229  (*timer_expiration_handlers[timer_id]) (connection_index);
1230  }
1231 }
1232 
1233 static void
1235 {
1236  tw_timer_wheel_16t_2w_512sl_t *tw;
1237  /* *INDENT-OFF* */
1238  foreach_vlib_main (({
1239  tw = &tm->wrk_ctx[ii].timer_wheel;
1240  tw_timer_wheel_init_16t_2w_512sl (tw, tcp_expired_timers_dispatch,
1241  100e-3 /* timer period 100ms */ , ~0);
1242  tw->last_run_time = vlib_time_now (this_vlib_main);
1243  }));
1244  /* *INDENT-ON* */
1245 }
1246 
1247 static clib_error_t *
1249 {
1250  tcp_main_t *tm = vnet_get_tcp_main ();
1252  clib_error_t *error = 0;
1253  u32 num_threads;
1254  int thread;
1255  tcp_connection_t *tc __attribute__ ((unused));
1256  u32 preallocated_connections_per_thread;
1257 
1258  if ((error = vlib_call_init_function (vm, ip_main_init)))
1259  return error;
1260  if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
1261  return error;
1262  if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
1263  return error;
1264 
1265  /*
1266  * Registrations
1267  */
1268 
1269  ip4_register_protocol (IP_PROTOCOL_TCP, tcp4_input_node.index);
1270  ip6_register_protocol (IP_PROTOCOL_TCP, tcp6_input_node.index);
1271 
1272  /*
1273  * Initialize data structures
1274  */
1275 
1276  num_threads = 1 /* main thread */ + vtm->n_threads;
1277  vec_validate (tm->connections, num_threads - 1);
1278 
1279  /*
1280  * Preallocate connections. Assume that thread 0 won't
1281  * use preallocated threads when running multi-core
1282  */
1283  if (num_threads == 1)
1284  {
1285  thread = 0;
1286  preallocated_connections_per_thread = tm->preallocated_connections;
1287  }
1288  else
1289  {
1290  thread = 1;
1291  preallocated_connections_per_thread =
1292  tm->preallocated_connections / (num_threads - 1);
1293  }
1294  for (; thread < num_threads; thread++)
1295  {
1296  if (preallocated_connections_per_thread)
1297  pool_init_fixed (tm->connections[thread],
1298  preallocated_connections_per_thread);
1299  }
1300 
1301  /*
1302  * Use a preallocated half-open connection pool?
1303  */
1304  if (tm->preallocated_half_open_connections)
1305  pool_init_fixed (tm->half_open_connections,
1306  tm->preallocated_half_open_connections);
1307 
1308  /* Initialize clocks per tick for TCP timestamp. Used to compute
1309  * monotonically increasing timestamps. */
1310  tm->tstamp_ticks_per_clock = vm->clib_time.seconds_per_clock
1312 
1313  if (num_threads > 1)
1314  {
1315  clib_spinlock_init (&tm->half_open_lock);
1316  }
1317 
1318  vec_validate (tm->wrk_ctx, num_threads - 1);
1320 
1321  tm->bytes_per_buffer = vlib_buffer_free_list_buffer_size
1323 
1324  return error;
1325 }
1326 
1327 clib_error_t *
1329 {
1330  if (is_en)
1331  {
1332  if (tcp_main.is_enabled)
1333  return 0;
1334 
1335  return tcp_main_enable (vm);
1336  }
1337  else
1338  {
1339  tcp_main.is_enabled = 0;
1340  }
1341 
1342  return 0;
1343 }
1344 
1345 void
1346 tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add)
1347 {
1348  tcp_main_t *tm = &tcp_main;
1349  if (is_ip4)
1350  tm->punt_unknown4 = is_add;
1351  else
1352  tm->punt_unknown6 = is_add;
1353 }
1354 
1355 static clib_error_t *
1357 {
1358  tcp_main_t *tm = vnet_get_tcp_main ();
1359  ip_main_t *im = &ip_main;
1360  ip_protocol_info_t *pi;
1361 
1362  /* Session layer, and by implication tcp, are disabled by default */
1363  tm->is_enabled = 0;
1364 
1365  /* Register with IP for header parsing */
1366  pi = ip_get_protocol_info (im, IP_PROTOCOL_TCP);
1367  if (pi == 0)
1368  return clib_error_return (0, "TCP protocol info AWOL");
1371 
1372  /* Register as transport with session layer */
1377 
1378  tcp_api_reference ();
1379  return 0;
1380 }
1381 
1383 
1384 static clib_error_t *
1386 {
1387  tcp_main_t *tm = vnet_get_tcp_main ();
1388 
1389  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1390  {
1391  if (unformat
1392  (input, "preallocated-connections %d",
1393  &tm->preallocated_connections))
1394  ;
1395  else if (unformat (input, "preallocated-half-open-connections %d",
1396  &tm->preallocated_half_open_connections))
1397  ;
1398  else if (unformat (input, "buffer-fail-fraction %f",
1399  &tm->buffer_fail_fraction))
1400  ;
1401  else
1402  return clib_error_return (0, "unknown input `%U'",
1403  format_unformat_error, input);
1404  }
1405  return 0;
1406 }
1407 
1409 
1410 
1411 /**
1412  * \brief Configure an ipv4 source address range
1413  * @param vm vlib_main_t pointer
1414  * @param start first ipv4 address in the source address range
1415  * @param end last ipv4 address in the source address range
1416  * @param table_id VRF / table ID, 0 for the default FIB
1417  * @return 0 if all OK, else an error indication from api_errno.h
1418  */
1419 
1420 int
1422  ip4_address_t * start,
1423  ip4_address_t * end, u32 table_id)
1424 {
1425  tcp_main_t *tm = vnet_get_tcp_main ();
1426  vnet_main_t *vnm = vnet_get_main ();
1427  u32 start_host_byte_order, end_host_byte_order;
1429  vnet_sw_interface_t *si;
1430  fib_node_index_t fei;
1431  u32 fib_index = 0;
1432  u32 sw_if_index;
1433  int rv;
1434  int vnet_proxy_arp_add_del (ip4_address_t * lo_addr,
1435  ip4_address_t * hi_addr, u32 fib_index,
1436  int is_del);
1437 
1438  memset (&prefix, 0, sizeof (prefix));
1439 
1440  fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
1441 
1442  if (fib_index == ~0)
1443  return VNET_API_ERROR_NO_SUCH_FIB;
1444 
1445  start_host_byte_order = clib_net_to_host_u32 (start->as_u32);
1446  end_host_byte_order = clib_net_to_host_u32 (end->as_u32);
1447 
1448  /* sanity check for reversed args or some such */
1449  if ((end_host_byte_order - start_host_byte_order) > (10 << 10))
1450  return VNET_API_ERROR_INVALID_ARGUMENT;
1451 
1452  /* Lookup the last address, to identify the interface involved */
1453  prefix.fp_len = 32;
1454  prefix.fp_proto = FIB_PROTOCOL_IP4;
1455  memcpy (&prefix.fp_addr.ip4, end, sizeof (ip4_address_t));
1456 
1457  fei = fib_table_lookup (fib_index, &prefix);
1458 
1459  /* Couldn't find route to destination. Bail out. */
1460  if (fei == FIB_NODE_INDEX_INVALID)
1461  return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB;
1462 
1463  sw_if_index = fib_entry_get_resolving_interface (fei);
1464 
1465  /* Enable proxy arp on the interface */
1466  si = vnet_get_sw_interface (vnm, sw_if_index);
1468 
1469  /* Configure proxy arp across the range */
1470  rv = vnet_proxy_arp_add_del (start, end, fib_index, 0 /* is_del */ );
1471 
1472  if (rv)
1473  return rv;
1474 
1475  do
1476  {
1477  dpo_id_t dpo = DPO_INVALID;
1478 
1479  vec_add1 (tm->ip4_src_addresses, start[0]);
1480 
1481  /* Add local adjacencies for the range */
1482 
1483  receive_dpo_add_or_lock (DPO_PROTO_IP4, ~0 /* sw_if_index */ ,
1484  NULL, &dpo);
1485  prefix.fp_len = 32;
1486  prefix.fp_proto = FIB_PROTOCOL_IP4;
1487  prefix.fp_addr.ip4.as_u32 = start->as_u32;
1488 
1490  &prefix,
1492  FIB_ENTRY_FLAG_EXCLUSIVE, &dpo);
1493  dpo_reset (&dpo);
1494 
1495  start_host_byte_order++;
1496  start->as_u32 = clib_host_to_net_u32 (start_host_byte_order);
1497  }
1498  while (start_host_byte_order <= end_host_byte_order);
1499 
1500  return 0;
1501 }
1502 
1503 /**
1504  * \brief Configure an ipv6 source address range
1505  * @param vm vlib_main_t pointer
1506  * @param start first ipv6 address in the source address range
1507  * @param end last ipv6 address in the source address range
1508  * @param table_id VRF / table ID, 0 for the default FIB
1509  * @return 0 if all OK, else an error indication from api_errno.h
1510  */
1511 
1512 int
1514  ip6_address_t * start,
1515  ip6_address_t * end, u32 table_id)
1516 {
1517  tcp_main_t *tm = vnet_get_tcp_main ();
1519  u32 fib_index = 0;
1520  fib_node_index_t fei;
1521  u32 sw_if_index;
1522 
1523  memset (&prefix, 0, sizeof (prefix));
1524 
1525  fib_index = fib_table_find (FIB_PROTOCOL_IP6, table_id);
1526 
1527  if (fib_index == ~0)
1528  return VNET_API_ERROR_NO_SUCH_FIB;
1529 
1530  while (1)
1531  {
1532  int i;
1533  ip6_address_t tmp;
1534  dpo_id_t dpo = DPO_INVALID;
1535 
1536  /* Remember this address */
1537  vec_add1 (tm->ip6_src_addresses, start[0]);
1538 
1539  /* Lookup the prefix, to identify the interface involved */
1540  prefix.fp_len = 128;
1541  prefix.fp_proto = FIB_PROTOCOL_IP6;
1542  memcpy (&prefix.fp_addr.ip6, start, sizeof (ip6_address_t));
1543 
1544  fei = fib_table_lookup (fib_index, &prefix);
1545 
1546  /* Couldn't find route to destination. Bail out. */
1547  if (fei == FIB_NODE_INDEX_INVALID)
1548  return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB;
1549 
1550  sw_if_index = fib_entry_get_resolving_interface (fei);
1551 
1552  if (sw_if_index == (u32) ~ 0)
1553  return VNET_API_ERROR_NO_MATCHING_INTERFACE;
1554 
1555  /* Add a proxy neighbor discovery entry for this address */
1556  ip6_neighbor_proxy_add_del (sw_if_index, start, 0 /* is_del */ );
1557 
1558  /* Add a receive adjacency for this address */
1559  receive_dpo_add_or_lock (DPO_PROTO_IP6, ~0 /* sw_if_index */ ,
1560  NULL, &dpo);
1561 
1563  &prefix,
1565  FIB_ENTRY_FLAG_EXCLUSIVE, &dpo);
1566  dpo_reset (&dpo);
1567 
1568  /* Done with the entire range? */
1569  if (!memcmp (start, end, sizeof (start[0])))
1570  break;
1571 
1572  /* Increment the address. DGMS. */
1573  tmp = start[0];
1574  for (i = 15; i >= 0; i--)
1575  {
1576  tmp.as_u8[i] += 1;
1577  if (tmp.as_u8[i] != 0)
1578  break;
1579  }
1580  start[0] = tmp;
1581  }
1582  return 0;
1583 }
1584 
1585 static clib_error_t *
1587  unformat_input_t * input, vlib_cli_command_t * cmd_arg)
1588 {
1589  ip4_address_t v4start, v4end;
1590  ip6_address_t v6start, v6end;
1591  u32 table_id = 0;
1592  int v4set = 0;
1593  int v6set = 0;
1594  int rv;
1595 
1596  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1597  {
1598  if (unformat (input, "%U - %U", unformat_ip4_address, &v4start,
1599  unformat_ip4_address, &v4end))
1600  v4set = 1;
1601  else if (unformat (input, "%U", unformat_ip4_address, &v4start))
1602  {
1603  memcpy (&v4end, &v4start, sizeof (v4start));
1604  v4set = 1;
1605  }
1606  else if (unformat (input, "%U - %U", unformat_ip6_address, &v6start,
1607  unformat_ip6_address, &v6end))
1608  v6set = 1;
1609  else if (unformat (input, "%U", unformat_ip6_address, &v6start))
1610  {
1611  memcpy (&v6end, &v6start, sizeof (v6start));
1612  v6set = 1;
1613  }
1614  else if (unformat (input, "fib-table %d", &table_id))
1615  ;
1616  else
1617  break;
1618  }
1619 
1620  if (!v4set && !v6set)
1621  return clib_error_return (0, "at least one v4 or v6 address required");
1622 
1623  if (v4set)
1624  {
1625  rv = tcp_configure_v4_source_address_range (vm, &v4start, &v4end,
1626  table_id);
1627  switch (rv)
1628  {
1629  case 0:
1630  break;
1631 
1632  case VNET_API_ERROR_NO_SUCH_FIB:
1633  return clib_error_return (0, "Invalid table-id %d", table_id);
1634 
1635  case VNET_API_ERROR_INVALID_ARGUMENT:
1636  return clib_error_return (0, "Invalid address range %U - %U",
1637  format_ip4_address, &v4start,
1638  format_ip4_address, &v4end);
1639  default:
1640  return clib_error_return (0, "error %d", rv);
1641  break;
1642  }
1643  }
1644  if (v6set)
1645  {
1646  rv = tcp_configure_v6_source_address_range (vm, &v6start, &v6end,
1647  table_id);
1648  switch (rv)
1649  {
1650  case 0:
1651  break;
1652 
1653  case VNET_API_ERROR_NO_SUCH_FIB:
1654  return clib_error_return (0, "Invalid table-id %d", table_id);
1655 
1656  default:
1657  return clib_error_return (0, "error %d", rv);
1658  break;
1659  }
1660  }
1661  return 0;
1662 }
1663 
1664 /* *INDENT-OFF* */
1665 VLIB_CLI_COMMAND (tcp_src_address_command, static) =
1666 {
1667  .path = "tcp src-address",
1668  .short_help = "tcp src-address <ip-addr> [- <ip-addr>] add src address range",
1669  .function = tcp_src_address,
1670 };
1671 /* *INDENT-ON* */
1672 
1673 static u8 *
1675 {
1676 #if TCP_SCOREBOARD_TRACE
1677 
1678  scoreboard_trace_elt_t *block;
1679  int i = 0;
1680 
1681  if (!sb->trace)
1682  return s;
1683 
1684  s = format (s, "scoreboard trace:");
1685  vec_foreach (block, sb->trace)
1686  {
1687  s = format (s, "{%u, %u, %u, %u, %u}, ", block->start, block->end,
1688  block->ack, block->snd_una_max, block->group);
1689  if ((++i % 3) == 0)
1690  s = format (s, "\n");
1691  }
1692  return s;
1693 #else
1694  return 0;
1695 #endif
1696 }
1697 
1698 static clib_error_t *
1700  vlib_cli_command_t * cmd_arg)
1701 {
1702  transport_connection_t *tconn = 0;
1703  tcp_connection_t *tc;
1704  u8 *s = 0;
1705  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1706  {
1707  if (unformat (input, "%U", unformat_transport_connection, &tconn,
1709  ;
1710  else
1711  return clib_error_return (0, "unknown input `%U'",
1712  format_unformat_error, input);
1713  }
1714 
1715  if (!TCP_SCOREBOARD_TRACE)
1716  {
1717  vlib_cli_output (vm, "scoreboard tracing not enabled");
1718  return 0;
1719  }
1720 
1721  tc = tcp_get_connection_from_transport (tconn);
1722  s = tcp_scoreboard_dump_trace (s, &tc->sack_sb);
1723  vlib_cli_output (vm, "%v", s);
1724  return 0;
1725 }
1726 
1727 /* *INDENT-OFF* */
1728 VLIB_CLI_COMMAND (tcp_show_scoreboard_trace_command, static) =
1729 {
1730  .path = "show tcp scoreboard trace",
1731  .short_help = "show tcp scoreboard trace <connection>",
1732  .function = tcp_show_scoreboard_trace_fn,
1733 };
1734 /* *INDENT-ON* */
1735 
1736 u8 *
1738 {
1739  int i, trace_len;
1741  u32 next_ack, left, group, has_new_ack = 0;
1742  tcp_connection_t _dummy_tc, *dummy_tc = &_dummy_tc;
1743  sack_block_t *block;
1744 
1745  if (!tc)
1746  return s;
1747 
1748  memset (dummy_tc, 0, sizeof (*dummy_tc));
1749  tcp_connection_timers_init (dummy_tc);
1750  scoreboard_init (&dummy_tc->sack_sb);
1751  dummy_tc->rcv_opts.flags |= TCP_OPTS_FLAG_SACK;
1752 
1753 #if TCP_SCOREBOARD_TRACE
1754  trace = tc->sack_sb.trace;
1755  trace_len = vec_len (tc->sack_sb.trace);
1756 #else
1757  trace = 0;
1758  trace_len = 0;
1759 #endif
1760 
1761  for (i = 0; i < trace_len; i++)
1762  {
1763  if (trace[i].ack != 0)
1764  {
1765  dummy_tc->snd_una = trace[i].ack - 1448;
1766  dummy_tc->snd_una_max = trace[i].ack;
1767  }
1768  }
1769 
1770  left = 0;
1771  while (left < trace_len)
1772  {
1773  group = trace[left].group;
1774  vec_reset_length (dummy_tc->rcv_opts.sacks);
1775  has_new_ack = 0;
1776  while (trace[left].group == group)
1777  {
1778  if (trace[left].ack != 0)
1779  {
1780  if (verbose)
1781  s = format (s, "Adding ack %u, snd_una_max %u, segs: ",
1782  trace[left].ack, trace[left].snd_una_max);
1783  dummy_tc->snd_una_max = trace[left].snd_una_max;
1784  next_ack = trace[left].ack;
1785  has_new_ack = 1;
1786  }
1787  else
1788  {
1789  if (verbose)
1790  s = format (s, "[%u, %u], ", trace[left].start,
1791  trace[left].end);
1792  vec_add2 (dummy_tc->rcv_opts.sacks, block, 1);
1793  block->start = trace[left].start;
1794  block->end = trace[left].end;
1795  }
1796  left++;
1797  }
1798 
1799  /* Push segments */
1800  tcp_rcv_sacks (dummy_tc, next_ack);
1801  if (has_new_ack)
1802  dummy_tc->snd_una = next_ack + dummy_tc->sack_sb.snd_una_adv;
1803 
1804  if (verbose)
1805  s = format (s, "result: %U", format_tcp_scoreboard,
1806  &dummy_tc->sack_sb);
1807 
1808  }
1809  s = format (s, "result: %U", format_tcp_scoreboard, &dummy_tc->sack_sb);
1810 
1811  return s;
1812 }
1813 
1814 static clib_error_t *
1816  vlib_cli_command_t * cmd_arg)
1817 {
1818  transport_connection_t *tconn = 0;
1819  tcp_connection_t *tc = 0;
1820  u8 *str = 0;
1821  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1822  {
1823  if (unformat (input, "%U", unformat_transport_connection, &tconn,
1825  ;
1826  else
1827  return clib_error_return (0, "unknown input `%U'",
1828  format_unformat_error, input);
1829  }
1830 
1831  if (!TCP_SCOREBOARD_TRACE)
1832  {
1833  vlib_cli_output (vm, "scoreboard tracing not enabled");
1834  return 0;
1835  }
1836 
1837  tc = tcp_get_connection_from_transport (tconn);
1838  if (!tc)
1839  {
1840  vlib_cli_output (vm, "connection not found");
1841  return 0;
1842  }
1843  str = tcp_scoreboard_replay (str, tc, 1);
1844  vlib_cli_output (vm, "%v", str);
1845  return 0;
1846 }
1847 
1848 /* *INDENT-OFF* */
1849 VLIB_CLI_COMMAND (tcp_replay_scoreboard_command, static) =
1850 {
1851  .path = "tcp replay scoreboard",
1852  .short_help = "tcp replay scoreboard <connection>",
1853  .function = tcp_scoreboard_trace_fn,
1854 };
1855 /* *INDENT-ON* */
1856 
1857 static clib_error_t *
1859  vlib_cli_command_t * cmd_arg)
1860 {
1861  tcp_main_t *tm = vnet_get_tcp_main ();
1863  return clib_error_return (0, "unknown input `%U'", format_unformat_error,
1864  input);
1865  vlib_cli_output (vm, "IPv4 TCP punt: %s",
1866  tm->punt_unknown4 ? "enabled" : "disabled");
1867  vlib_cli_output (vm, "IPv6 TCP punt: %s",
1868  tm->punt_unknown6 ? "enabled" : "disabled");
1869  return 0;
1870 }
1871 /* *INDENT-OFF* */
1872 VLIB_CLI_COMMAND (show_tcp_punt_command, static) =
1873 {
1874  .path = "show tcp punt",
1875  .short_help = "show tcp punt",
1876  .function = show_tcp_punt_fn,
1877 };
1878 /* *INDENT-ON* */
1879 
1880 /*
1881  * fd.io coding-style-patch-verification: ON
1882  *
1883  * Local Variables:
1884  * eval: (c-set-style "gnu")
1885  * End:
1886  */
static void tcp_session_close(u32 conn_index, u32 thread_index)
Definition: tcp.c:362
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:437
#define tcp_in_cong_recovery(tc)
Definition: tcp.h:350
void dpo_stack_from_node(u32 child_node_index, dpo_id_t *dpo, const dpo_id_t *parent)
Stack one DPO object on another, and thus establish a child parent relationship.
Definition: dpo.c:530
static int tcp_session_open(transport_endpoint_t *tep)
Definition: tcp.c:653
fib_protocol_t fp_proto
protocol type
Definition: fib_types.h:202
#define TCP_2MSL_TIME
Definition: tcp.h:101
static vlib_cli_command_t trace
(constructor) VLIB_CLI_COMMAND (trace)
Definition: vlib_api_cli.c:862
static void tcp_add_del_adjacency(tcp_connection_t *tc, u8 is_add)
Definition: tcp.c:59
void receive_dpo_add_or_lock(dpo_proto_t proto, u32 sw_if_index, const ip46_address_t *nh_addr, dpo_id_t *dpo)
Definition: receive_dpo.c:56
An entry in a FIB table.
Definition: fib_entry.h:458
#define clib_min(x, y)
Definition: clib.h:289
static u8 * format_tcp_listener_session(u8 *s, va_list *args)
Definition: tcp.c:857
virtual circuit service
const char * tcp_fsm_states[]
Definition: tcp.c:664
static clib_error_t * tcp_config_fn(vlib_main_t *vm, unformat_input_t *input)
Definition: tcp.c:1385
#define tcp_in_recovery(tc)
Definition: tcp.h:344
void ip_copy(ip46_address_t *dst, ip46_address_t *src, u8 is_ip4)
Definition: ip.c:81
#define seq_leq(_s1, _s2)
Definition: tcp.h:547
static u32 tcp_session_push_header(transport_connection_t *tconn, vlib_buffer_t *b)
Definition: tcp.c:1098
struct _sack_block sack_block_t
u8 * format_tcp_rcv_sacks(u8 *s, va_list *args)
Definition: tcp.c:897
void ip6_register_protocol(u32 protocol, u32 node_index)
Definition: ip6_forward.c:1426
struct _scoreboard_trace_elt scoreboard_trace_elt_t
u8 * format_tcp_sacks(u8 *s, va_list *args)
Definition: tcp.c:873
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
struct _transport_connection transport_connection_t
const char * tcp_connection_flags_str[]
Definition: tcp.c:682
vlib_node_registration_t tcp4_output_node
(constructor) VLIB_REGISTER_NODE (tcp4_output_node)
Definition: tcp_output.c:2038
void scoreboard_init(sack_scoreboard_t *sb)
Definition: tcp_input.c:775
uword unformat_transport_connection(unformat_input_t *input, va_list *args)
Definition: session_cli.c:169
static u32 tcp_session_send_space(transport_connection_t *trans_conn)
Definition: tcp.c:1069
#define PREDICT_TRUE(x)
Definition: clib.h:106
static transport_connection_t * tcp_half_open_session_get_transport(u32 conn_index)
Definition: tcp.c:966
tcp_connection_t * tcp_connection_new(u8 thread_index)
Definition: tcp.c:248
u8 as_u8[16]
Definition: ip6_packet.h:48
static void tcp_timer_establish_handler(u32 conn_index)
Definition: tcp.c:1141
void ip_set(ip46_address_t *dst, void *src, u8 is_ip4)
Definition: ip.c:90
static u32 tcp_session_tx_fifo_offset(transport_connection_t *trans_conn)
Definition: tcp.c:1077
#define NULL
Definition: clib.h:55
static u32 ip4_compute_flow_hash(const ip4_header_t *ip, flow_hash_config_t flow_hash_config)
Definition: ip4.h:287
struct _sack_scoreboard sack_scoreboard_t
static int tcp_alloc_custom_local_endpoint(tcp_main_t *tm, ip46_address_t *lcl_addr, u16 *lcl_port, u8 is_ip4)
Definition: tcp.c:576
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:228
static tcp_connection_t * tcp_half_open_connection_new(void)
Definition: tcp.c:182
static u8 * format_tcp_timers(u8 *s, va_list *args)
Definition: tcp.c:714
static tcp_connection_t * tcp_half_open_connection_get(u32 conn_index)
Definition: tcp.h:515
sack_scoreboard_hole_t * scoreboard_next_hole(sack_scoreboard_t *sb, sack_scoreboard_hole_t *hole)
Definition: tcp_input.c:559
flow_hash_config_t lb_hash_config
the hash config to use when selecting a bucket.
Definition: load_balance.h:134
static_always_inline void clib_spinlock_unlock_if_init(clib_spinlock_t *p)
Definition: lock.h:98
struct _tcp_main tcp_main_t
struct _transport_proto_vft transport_proto_vft_t
void tcp_connection_timers_reset(tcp_connection_t *tc)
Stop all connection timers.
Definition: tcp.c:401
vlib_node_registration_t tcp6_output_node
(constructor) VLIB_REGISTER_NODE (tcp6_output_node)
Definition: tcp_output.c:2059
void dpo_copy(dpo_id_t *dst, const dpo_id_t *src)
atomic copy a data-plane object.
Definition: dpo.c:261
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:523
timer_expiration_handler tcp_timer_retransmit_handler
static heap_elt_t * last(heap_header_t *h)
Definition: heap.c:53
#define vec_add2(V, P, N)
Add N elements to end of vector V, return pointer to new elements in P.
Definition: vec.h:562
int i
int ip6_neighbor_proxy_add_del(u32 sw_if_index, ip6_address_t *addr, u8 is_del)
void tcp_update_burst_snd_vars(tcp_connection_t *tc)
Update burst send vars.
Definition: tcp_output.c:416
static vnet_sw_interface_t * vnet_get_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
void * ip_interface_get_first_ip(u32 sw_if_index, u8 is_ip4)
Definition: ip.c:133
struct _tcp_connection tcp_connection_t
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
static u32 tcp_available_cc_snd_space(const tcp_connection_t *tc)
Estimate of how many bytes we can still push into the network.
Definition: tcp.h:635
clib_time_t clib_time
Definition: main.h:63
static u32 tcp_available_snd_wnd(const tcp_connection_t *tc)
Definition: tcp.h:614
static u16 tcp_session_send_mss(transport_connection_t *trans_conn)
Compute maximum segment size for session layer.
Definition: tcp.c:980
Definition: ip.h:109
static tcp_connection_t * tcp_get_connection_from_transport(transport_connection_t *tconn)
Definition: tcp.h:488
void ip4_register_protocol(u32 protocol, u32 node_index)
Definition: ip4_forward.c:1584
static void tcp_initialize_timer_wheels(tcp_main_t *tm)
Definition: tcp.c:1234
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:228
struct _tcp_header tcp_header_t
fib_protocol_t nh_proto
Definition: tcp.c:33
int tcp_half_open_connection_cleanup(tcp_connection_t *tc)
Try to cleanup half-open connection.
Definition: tcp.c:170
static void tcp_half_open_connection_del(tcp_connection_t *tc)
Cleanup half-open connection.
Definition: tcp.c:150
unsigned char u8
Definition: types.h:56
struct _sack_scoreboard_hole sack_scoreboard_hole_t
enum fib_protocol_t_ fib_protocol_t
Protocol Type.
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
double f64
Definition: types.h:142
pthread_t thread[MAX_CONNS]
Definition: main.c:125
tcp_cc_algorithm_t * tcp_cc_algo_get(tcp_cc_algorithm_type_e type)
Definition: tcp.c:525
#define TCP_RTO_INIT
Definition: tcp.h:111
format_function_t format_ip4_address
Definition: format.h:81
unformat_function_t * unformat_pg_edit
Definition: ip.h:90
#define VNET_SW_INTERFACE_FLAG_PROXY_ARP
Definition: interface.h:666
unformat_function_t unformat_ip4_address
Definition: format.h:76
void tcp_init_snd_vars(tcp_connection_t *tc)
Initialize connection send variables.
Definition: tcp.c:536
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:156
#define always_inline
Definition: clib.h:92
static u8 * format_tcp_vars(u8 *s, va_list *args)
Definition: tcp.c:758
u16 lb_n_buckets_minus_1
number of buckets in the load-balance - 1.
Definition: load_balance.h:99
void tcp_connection_timers_init(tcp_connection_t *tc)
Initialize all connection timers as invalid.
Definition: tcp.c:384
static u32 tcp_available_output_snd_space(const tcp_connection_t *tc)
Definition: tcp.h:620
tcp_main_t tcp_main
Definition: tcp.c:29
static void tcp_connection_unbind(u32 listener_index)
Definition: tcp.c:113
Aggregrate type for a prefix.
Definition: fib_types.h:193
#define clib_error_return(e, args...)
Definition: error.h:99
void stream_session_delete_notify(transport_connection_t *tc)
Notification from transport that connection is being deleted.
Definition: session.c:787
void adj_unlock(adj_index_t adj_index)
Release a reference counting lock on the adjacency.
Definition: adj.c:240
vhost_vring_state_t state
Definition: vhost_user.h:115
static u8 * tcp_scoreboard_dump_trace(u8 *s, sack_scoreboard_t *sb)
Definition: tcp.c:1674
timer_expiration_handler tcp_timer_retransmit_syn_handler
static u32 tcp_time_now(void)
Definition: tcp.h:668
unsigned int u32
Definition: types.h:88
u32 fib_table_find(fib_protocol_t proto, u32 table_id)
Get the index of the FIB for a Table-ID.
Definition: fib_table.c:1056
u16 fp_len
The mask length.
Definition: fib_types.h:197
#define vlib_call_init_function(vm, x)
Definition: init.h:227
void tcp_api_reference(void)
Definition: tcp_api.c:109
#define TCP_EVT_DBG(_evt, _args...)
Definition: tcp_debug.h:238
fib_node_index_t fib_table_lookup(u32 fib_index, const fib_prefix_t *prefix)
Perfom a longest prefix match in the non-forwarding table.
Definition: fib_table.c:66
static u32 tcp_connection_bind(u32 session_index, transport_endpoint_t *lcl)
Definition: tcp.c:73
static int tcp_connection_open(transport_endpoint_t *rmt)
Definition: tcp.c:606
static i32 tcp_rcv_wnd_available(tcp_connection_t *tc)
Definition: tcp.c:752
static void tcp_cc_init(tcp_connection_t *tc)
Definition: tcp.c:508
static void clib_spinlock_init(clib_spinlock_t *p)
Definition: lock.h:57
static void tcp_timer_set(tcp_connection_t *tc, u8 timer_id, u32 interval)
Definition: tcp.h:697
static u32 tcp_session_unbind(u32 listener_index)
Definition: tcp.c:130
static timer_expiration_handler * timer_expiration_handlers[TCP_N_TIMERS]
Definition: tcp.c:1202
The identity of a DPO is a combination of its type and its instance number/index of objects of that t...
Definition: dpo.h:168
static clib_error_t * tcp_main_enable(vlib_main_t *vm)
Definition: tcp.c:1248
Definition: fib_entry.h:279
#define ADJ_INDEX_INVALID
Invalid ADJ index - used when no adj is known likewise blazoned capitals INVALID speak volumes where ...
Definition: adj_types.h:36
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:464
timer_expiration_handler tcp_timer_persist_handler
static transport_connection_t * tcp_session_get_transport(u32 conn_index, u32 thread_index)
Definition: tcp.c:959
static ip_protocol_info_t * ip_get_protocol_info(ip_main_t *im, u32 protocol)
Definition: ip.h:136
u32 tcp_push_header(tcp_connection_t *tconn, vlib_buffer_t *b)
Definition: tcp_output.c:1185
#define tcp_in_fastrecovery(tc)
Definition: tcp.h:343
ip46_address_t fp_addr
The address type is not deriveable from the fp_addr member.
Definition: fib_types.h:216
dpo_type_t dpoi_type
the type
Definition: dpo.h:172
format_function_t * format_header
Definition: ip.h:81
static const dpo_id_t * load_balance_get_bucket_i(const load_balance_t *lb, u32 bucket)
Definition: load_balance.h:209
void tcp_rcv_sacks(tcp_connection_t *tc, u32 ack)
Definition: tcp_input.c:817
void tcp_send_syn(tcp_connection_t *tc)
Send SYN.
Definition: tcp_output.c:986
struct _unformat_input_t unformat_input_t
unsigned short u16
Definition: types.h:57
load-balancing over a choice of [un]equal cost paths
Definition: dpo.h:102
static transport_connection_t * tcp_session_get_listener(u32 listener_index)
Definition: tcp.c:137
#define VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX
Definition: buffer.h:439
static u32 ip6_compute_flow_hash(const ip6_header_t *ip, flow_hash_config_t flow_hash_config)
Definition: ip6.h:430
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:274
static void tcp_expired_timers_dispatch(u32 *expired_timers)
Definition: tcp.c:1215
#define TCP_TIMER_HANDLE_INVALID
Definition: tcp.h:93
static void tcp_session_cleanup(u32 conn_index, u32 thread_index)
Definition: tcp.c:370
The FIB DPO provieds;.
Definition: load_balance.h:84
#define TCP_CLEANUP_TIME
Definition: tcp.h:104
static u32 tcp_flight_size(const tcp_connection_t *tc)
Our estimate of the number of bytes in flight (pipe size)
Definition: tcp.h:572
#define PREDICT_FALSE(x)
Definition: clib.h:105
#define VLIB_CONFIG_FUNCTION(x, n,...)
Definition: init.h:164
reliable transport protos
u8 * format_tcp_scoreboard(u8 *s, va_list *args)
Definition: tcp.c:933
clib_error_t * vnet_tcp_enable_disable(vlib_main_t *vm, u8 is_en)
Definition: tcp.c:1328
f64 seconds_per_clock
Definition: time.h:57
static void tcp_timer_waitclose_handler(u32 conn_index)
Definition: tcp.c:1169
void( timer_expiration_handler)(u32 index)
Definition: tcp.h:86
#define foreach_vlib_main(body)
Definition: threads.h:244
#define TCP_DBG(_fmt, _args...)
Definition: tcp_debug.h:89
u32 fib_entry_get_resolving_interface(fib_node_index_t entry_index)
Definition: fib_entry.c:1409
static void tcp_timer_reset(tcp_connection_t *tc, u8 timer_id)
Definition: tcp.h:708
#define tcp_fastrecovery_sent_1_smss(tc)
Definition: tcp.h:346
unformat_function_t unformat_ip6_address
Definition: format.h:97
clib_error_t * ip_main_init(vlib_main_t *vm)
Definition: ip_init.c:45
fib_node_index_t fib_table_entry_special_dpo_update(u32 fib_index, const fib_prefix_t *prefix, fib_source_t source, fib_entry_flag_t flags, const dpo_id_t *dpo)
Update a &#39;special&#39; entry to the FIB that links to the DPO passed A special entry is an entry that the...
Definition: fib_table.c:346
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
int tcp_configure_v4_source_address_range(vlib_main_t *vm, ip4_address_t *start, ip4_address_t *end, u32 table_id)
Configure an ipv4 source address range.
Definition: tcp.c:1421
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:221
format_function_t format_ip6_address
Definition: format.h:99
vlib_main_t * vm
Definition: buffer.c:294
ip_main_t ip_main
Definition: ip_init.c:42
static void tcp_add_del_adj_cb(tcp_add_del_adj_args_t *args)
Definition: tcp.c:41
static clib_error_t * tcp_src_address(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
Definition: tcp.c:1586
void tcp_connection_close(tcp_connection_t *tc)
Begin connection closing procedure.
Definition: tcp.c:314
#define ENDPOINT_INVALID_INDEX
Definition: transport.h:116
#define clib_warning(format, args...)
Definition: error.h:59
#define clib_memcpy(a, b, c)
Definition: string.h:75
format_function_t format_tcp_header
Definition: format.h:107
const char * tcp_dbg_evt_str[]
Definition: tcp.c:658
static u8 * format_tcp_connection_flags(u8 *s, va_list *args)
Definition: tcp.c:689
u32 fib_node_index_t
A typedef of a node index.
Definition: fib_types.h:30
void tcp_flush_frames_to_output(u8 thread_index)
Flush v4 and v6 tcp and ip-lookup tx frames for thread index.
Definition: tcp_output.c:1057
vlib_node_registration_t tcp6_input_node
(constructor) VLIB_REGISTER_NODE (tcp6_input_node)
Definition: tcp_input.c:3387
fib_node_index_t tcp_lookup_rmt_in_fib(tcp_connection_t *tc)
fib_entry_t * fib_entry_get(fib_node_index_t index)
Definition: fib_entry.c:45
int vnet_proxy_arp_add_del(ip4_address_t *lo_addr, ip4_address_t *hi_addr, u32 fib_index, int is_del)
Definition: arp.c:2014
#define pool_init_fixed(pool, max_elts)
initialize a fixed-size, preallocated pool
Definition: pool.h:86
void transport_endpoint_cleanup(u8 proto, ip46_address_t *lcl_ip, u16 port)
Definition: transport.c:235
void transport_register_protocol(transport_proto_t transport_proto, const transport_proto_vft_t *vft, fib_protocol_t fib_proto, u32 output_node)
Register transport virtual function table.
Definition: transport.c:173
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:154
static void tcp_timer_update(tcp_connection_t *tc, u8 timer_id, u32 interval)
Definition: tcp.h:721
signed int i32
Definition: types.h:81
#define pool_put_index(p, i)
Free pool element with given index.
Definition: pool.h:299
#define ASSERT(truth)
u32 session_tx_fifo_max_dequeue(transport_connection_t *tc)
Definition: session.c:417
enum _tcp_cc_algorithm_type tcp_cc_algorithm_type_e
static clib_error_t * tcp_scoreboard_trace_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
Definition: tcp.c:1815
unformat_function_t unformat_pg_tcp_header
Definition: format.h:109
enum vnet_link_t_ vnet_link_t
Link Type: A description of the protocol of packets on the link.
static load_balance_t * load_balance_get(index_t lbi)
Definition: load_balance.h:200
#define seq_geq(_s1, _s2)
Definition: tcp.h:549
static u8 * format_tcp_congestion_status(u8 *s, va_list *args)
Definition: tcp.c:739
void stream_session_reset_notify(transport_connection_t *tc)
Notify application that connection has been reset.
Definition: session.c:802
static u32 tcp_snd_space(tcp_connection_t *tc)
Compute tx window session is allowed to fill.
Definition: tcp.c:1020
static uword ip6_address_is_link_local_unicast(const ip6_address_t *a)
Definition: ip6_packet.h:302
From the control plane API.
Definition: fib_entry.h:74
void tcp_cc_algo_register(tcp_cc_algorithm_type_e type, const tcp_cc_algorithm_t *vft)
Definition: tcp.c:515
u8 * tcp_scoreboard_replay(u8 *s, tcp_connection_t *tc, u8 verbose)
Definition: tcp.c:1737
clib_error_t * ip4_lookup_init(vlib_main_t *vm)
Definition: ip4_forward.c:835
int tcp_configure_v6_source_address_range(vlib_main_t *vm, ip6_address_t *start, ip6_address_t *end, u32 table_id)
Configure an ipv6 source address range.
Definition: tcp.c:1513
struct _tcp_cc_algorithm tcp_cc_algorithm_t
Definition: tcp.h:252
#define clib_max(x, y)
Definition: clib.h:282
static clib_error_t * tcp_init(vlib_main_t *vm)
Definition: tcp.c:1356
static void tcp_timer_keep_handler(u32 conn_index)
Definition: tcp.c:1129
dpo_id_t fe_lb
The load-balance used for forwarding.
Definition: fib_entry.h:484
u8 ip_is_zero(ip46_address_t *ip46_address, u8 is_ip4)
Definition: ip.c:20
static const transport_proto_vft_t tcp_proto
Definition: tcp.c:1105
void tcp_punt_unknown(vlib_main_t *vm, u8 is_ip4, u8 is_add)
Definition: tcp.c:1346
#define tcp_fastrecovery_1_smss_on(tc)
Definition: tcp.h:347
void tcp_connection_reset(tcp_connection_t *tc)
Notify session that connection has been reset.
Definition: tcp.c:265
vlib_node_registration_t tcp4_input_node
(constructor) VLIB_REGISTER_NODE (tcp4_input_node)
Definition: tcp_input.c:3364
static u32 tcp_session_bind(u32 session_index, transport_endpoint_t *tep)
Definition: tcp.c:107
index_t dpoi_index
the index of objects of that type
Definition: dpo.h:184
ip46_address_t ip
Definition: tcp.c:35
#define FIB_NODE_INDEX_INVALID
Definition: fib_types.h:31
#define foreach_tcp_fsm_state
TCP FSM state definitions as per RFC793.
Definition: tcp.h:42
void tcp_send_fin(tcp_connection_t *tc)
Send FIN.
Definition: tcp_output.c:1070
#define foreach_tcp_connection_flag
TCP connection flags.
Definition: tcp.h:114
#define foreach_tcp_timer
TCP timers.
Definition: tcp.h:69
static u8 * format_tcp_connection_id(u8 *s, va_list *args)
Definition: tcp.c:798
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
void vlib_rpc_call_main_thread(void *callback, u8 *args, u32 arg_size)
Definition: threads.c:1868
static u32 tcp_set_time_now(u32 thread_index)
Definition: tcp.h:674
sack_scoreboard_hole_t * scoreboard_first_hole(sack_scoreboard_t *sb)
Definition: tcp_input.c:575
static u32 tcp_round_snd_space(tcp_connection_t *tc, u32 snd_space)
Definition: tcp.c:993
struct _transport_endpoint transport_endpoint_t
void tcp_connection_init_vars(tcp_connection_t *tc)
Initialize tcp connection variables.
Definition: tcp.c:560
#define DPO_INVALID
An initialiser for DPOs declared on the stack.
Definition: dpo.h:195
const char * tcp_conn_timers[]
Definition: tcp.c:707
static u8 * format_tcp_session(u8 *s, va_list *args)
Definition: tcp.c:841
static u32 vlib_buffer_free_list_buffer_size(vlib_main_t *vm, vlib_buffer_free_list_index_t index)
Definition: buffer_funcs.h:676
typedef prefix
Definition: ip_types.api:40
left
u8 * format_tcp_connection(u8 *s, va_list *args)
Definition: tcp.c:822
static u8 * format_tcp_sack_hole(u8 *s, va_list *args)
Definition: tcp.c:921
vnet_link_t link_type
Definition: tcp.c:34
static tcp_connection_t * tcp_connection_get(u32 conn_index, u32 thread_index)
Definition: tcp.h:469
static u32 random_u32(u32 *seed)
32-bit random number generator
Definition: random.h:69
u8 * format_unformat_error(u8 *s, va_list *va)
Definition: unformat.c:91
#define TCP_SCOREBOARD_TRACE
Definition: tcp.h:161
int session_stream_connect_notify(transport_connection_t *tc, u8 is_fail)
Definition: session.c:591
static vlib_thread_main_t * vlib_get_thread_main()
Definition: global_funcs.h:32
void tcp_connection_cleanup(tcp_connection_t *tc)
Cleans up connection state.
Definition: tcp.c:199
void tcp_connection_del(tcp_connection_t *tc)
Connection removal.
Definition: tcp.c:240
void tcp_init_mss(tcp_connection_t *tc)
Definition: tcp_output.c:436
adj_index_t adj_nbr_add_or_lock(fib_protocol_t nh_proto, vnet_link_t link_type, const ip46_address_t *nh_addr, u32 sw_if_index)
Neighbour Adjacency sub-type.
Definition: adj_nbr.c:214
void dpo_reset(dpo_id_t *dpo)
reset a DPO ID The DPO will be unlocked.
Definition: dpo.c:231
#define vec_foreach(var, vec)
Vector iterator.
int transport_alloc_local_endpoint(u8 proto, transport_endpoint_t *rmt, ip46_address_t *lcl_addr, u16 *lcl_port)
Definition: transport.c:301
#define TCP_TSTAMP_RESOLUTION
Time stamp resolution.
Definition: tcp.h:29
static u8 * format_tcp_half_open_session(u8 *s, va_list *args)
Definition: tcp.c:865
#define tcp_opts_sack_permitted(_to)
Definition: tcp_packet.h:160
int transport_alloc_local_port(u8 proto, ip46_address_t *ip)
Allocate local port and add if successful add entry to local endpoint table to mark the pair as used...
Definition: transport.c:256
u8 * format_tcp_state(u8 *s, va_list *args)
Definition: tcp.c:671
static clib_error_t * ip6_lookup_init(vlib_main_t *vm)
Definition: ip6_forward.c:2577
static clib_error_t * show_tcp_punt_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
Definition: tcp.c:1858
static void tcp_update_time(f64 now, u8 thread_index)
Definition: tcp.c:1088
static tcp_main_t * vnet_get_tcp_main()
Definition: tcp.h:442
timer_expiration_handler tcp_timer_delack_handler
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:681
static_always_inline void clib_spinlock_lock_if_init(clib_spinlock_t *p)
Definition: lock.h:82
static clib_error_t * tcp_show_scoreboard_trace_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd_arg)
Definition: tcp.c:1699
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
static u8 tcp_timer_is_active(tcp_connection_t *tc, tcp_timers_e timer)
Definition: tcp.h:794
static tcp_connection_t * tcp_listener_get(u32 tli)
Definition: tcp.h:509
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:170
adj_index_t adj_nbr_find(fib_protocol_t nh_proto, vnet_link_t link_type, const ip46_address_t *nh_addr, u32 sw_if_index)
Lookup neighbor adjancency.
Definition: adj_nbr.c:97