FD.io VPP  v18.07.1-19-g511ce25
Vector Packet Processing
bfd_main.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2011-2016 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  * @file
17  * @brief BFD nodes implementation
18  */
19 
20 #if WITH_LIBSSL > 0
21 #include <openssl/sha.h>
22 #endif
23 
24 #if __SSE4_2__
25 #include <x86intrin.h>
26 #endif
27 
28 #include <vppinfra/random.h>
29 #include <vppinfra/error.h>
30 #include <vppinfra/hash.h>
31 #include <vppinfra/xxhash.h>
32 #include <vnet/ethernet/ethernet.h>
33 #include <vnet/ethernet/packet.h>
34 #include <vnet/bfd/bfd_debug.h>
35 #include <vnet/bfd/bfd_protocol.h>
36 #include <vnet/bfd/bfd_main.h>
37 #include <vlib/log.h>
38 
39 static u64
40 bfd_calc_echo_checksum (u32 discriminator, u64 expire_time, u32 secret)
41 {
42  u64 checksum = 0;
43 #if defined(clib_crc32c_uses_intrinsics) && !defined (__i386__)
44  checksum = crc32_u64 (0, discriminator);
45  checksum = crc32_u64 (checksum, expire_time);
46  checksum = crc32_u64 (checksum, secret);
47 #else
48  checksum = clib_xxhash (discriminator ^ expire_time ^ secret);
49 #endif
50  return checksum;
51 }
52 
53 static u64
55 {
56  return bm->cpu_cps * ((f64) us / USEC_PER_SECOND);
57 }
58 
59 u32
60 bfd_clocks_to_usec (const bfd_main_t * bm, u64 clocks)
61 {
62  return (clocks / bm->cpu_cps) * USEC_PER_SECOND;
63 }
64 
66 
67 u8 *
68 format_bfd_auth_key (u8 * s, va_list * args)
69 {
70  const bfd_auth_key_t *key = va_arg (*args, bfd_auth_key_t *);
71  if (key)
72  {
73  s = format (s, "{auth-type=%u:%s, conf-key-id=%u, use-count=%u}, ",
75  key->conf_key_id, key->use_count);
76  }
77  else
78  {
79  s = format (s, "{none}");
80  }
81  return s;
82 }
83 
84 /*
85  * We actually send all bfd pkts to the "error" node after scanning
86  * them, so the graph node has only one next-index. The "error-drop"
87  * node automatically bumps our per-node packet counters for us.
88  */
89 typedef enum
90 {
94 
95 static void bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now,
96  int handling_wakeup);
97 
98 static void
100 {
101  bs->local_state = BFD_STATE_down;
102  bs->local_diag = BFD_DIAG_CODE_no_diag;
103  bs->remote_state = BFD_STATE_down;
104  bs->remote_discr = 0;
105  bs->hop_type = BFD_HOP_TYPE_SINGLE;
109  bs->remote_min_rx_usec = 1;
111  bs->remote_min_echo_rx_usec = 0;
113  bs->remote_demand = 0;
114  bs->auth.remote_seq_number = 0;
117  bs->echo_secret = random_u32 (&bm->random_seed);
118 }
119 
120 static void
122 {
123  if (bs->local_diag != code)
124  {
125  BFD_DBG ("set local_diag, bs_idx=%d: '%d:%s'", bs->bs_idx, code,
126  bfd_diag_code_string (code));
127  bs->local_diag = code;
128  }
129 }
130 
131 static void
133  bfd_state_e new_state, int handling_wakeup)
134 {
135  if (bs->local_state != new_state)
136  {
137  BFD_DBG ("Change state, bs_idx=%d: %s->%s", bs->bs_idx,
139  bfd_state_string (new_state));
140  bs->local_state = new_state;
141  bfd_on_state_change (bm, bs, clib_cpu_time_now (), handling_wakeup);
142  }
143 }
144 
145 const char *
147 {
148  switch (state)
149  {
150 #define F(x) \
151  case BFD_POLL_##x: \
152  return "BFD_POLL_" #x;
154 #undef F
155  }
156  return "UNKNOWN";
157 }
158 
159 static void
161 {
162  if (bs->poll_state != state)
163  {
164  BFD_DBG ("Setting poll state=%s, bs_idx=%u",
165  bfd_poll_state_string (state), bs->bs_idx);
166  bs->poll_state = state;
167  }
168 }
169 
170 static void
172 {
175  BFD_DBG ("Recalculated transmit interval " BFD_CLK_FMT,
176  BFD_CLK_PRN (bs->transmit_interval_clocks));
177 }
178 
179 static void
181 {
185  BFD_DBG ("Recalculated echo transmit interval " BFD_CLK_FMT,
186  BFD_CLK_PRN (bs->echo_transmit_interval_clocks));
187 }
188 
189 static void
191 {
192  if (bs->local_detect_mult > 1)
193  {
194  /* common case - 75-100% of transmit interval */
196  (1 - .25 * (random_f64 (&bm->random_seed))) *
198  if (bs->tx_timeout_clocks < now)
199  {
200  /*
201  * the timeout is in the past, which means that either remote
202  * demand mode was set or performance/clock issues ...
203  */
204  BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
205  "tx_timeout is %lu)",
206  (now - bs->tx_timeout_clocks) /
208  bs->tx_timeout_clocks = now;
209  }
210  }
211  else
212  {
213  /* special case - 75-90% of transmit interval */
215  (.9 - .15 * (random_f64 (&bm->random_seed))) *
217  if (bs->tx_timeout_clocks < now)
218  {
219  /*
220  * the timeout is in the past, which means that either remote
221  * demand mode was set or performance/clock issues ...
222  */
223  BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
224  "tx_timeout is %lu)",
225  (now - bs->tx_timeout_clocks) /
227  bs->tx_timeout_clocks = now;
228  }
229  }
230  if (bs->tx_timeout_clocks)
231  {
232  BFD_DBG ("Next transmit in %lu clocks/%.02fs@%lu",
233  bs->tx_timeout_clocks - now,
234  (bs->tx_timeout_clocks - now) / bm->cpu_cps,
235  bs->tx_timeout_clocks);
236  }
237 }
238 
239 static void
241 {
244  if (bs->echo_tx_timeout_clocks < now)
245  {
246  /* huh, we've missed it already, transmit now */
247  BFD_DBG ("Missed %lu echo transmit events (now is %lu, calc tx_timeout "
248  "is %lu)",
249  (now - bs->echo_tx_timeout_clocks) /
251  now, bs->echo_tx_timeout_clocks);
252  bs->echo_tx_timeout_clocks = now;
253  }
254  BFD_DBG ("Next echo transmit in %lu clocks/%.02fs@%lu",
255  bs->echo_tx_timeout_clocks - now,
256  (bs->echo_tx_timeout_clocks - now) / bm->cpu_cps,
258 }
259 
260 static void
262 {
263  if (bs->local_state == BFD_STATE_init || bs->local_state == BFD_STATE_up)
264  {
266  bs->remote_detect_mult *
269  BFD_DBG ("Recalculated detection time %lu clocks/%.2fs",
271  bs->detection_time_clocks / bm->cpu_cps);
272  }
273 }
274 
275 static void
277  int handling_wakeup)
278 {
279  u64 next = 0;
280  u64 rx_timeout = 0;
281  u64 tx_timeout = 0;
282  if (BFD_STATE_up == bs->local_state)
283  {
284  rx_timeout = bs->last_rx_clocks + bs->detection_time_clocks;
285  }
286  if (BFD_STATE_up != bs->local_state ||
287  (!bs->remote_demand && bs->remote_min_rx_usec) ||
288  BFD_POLL_NOT_NEEDED != bs->poll_state)
289  {
290  tx_timeout = bs->tx_timeout_clocks;
291  }
292  if (tx_timeout && rx_timeout)
293  {
294  next = clib_min (tx_timeout, rx_timeout);
295  }
296  else if (tx_timeout)
297  {
298  next = tx_timeout;
299  }
300  else if (rx_timeout)
301  {
302  next = rx_timeout;
303  }
304  if (bs->echo && next > bs->echo_tx_timeout_clocks)
305  {
306  next = bs->echo_tx_timeout_clocks;
307  }
308  BFD_DBG ("bs_idx=%u, tx_timeout=%lu, echo_tx_timeout=%lu, rx_timeout=%lu, "
309  "next=%s",
310  bs->bs_idx, tx_timeout, bs->echo_tx_timeout_clocks, rx_timeout,
311  next == tx_timeout
312  ? "tx" : (next == bs->echo_tx_timeout_clocks ? "echo tx" : "rx"));
313  /* sometimes the wheel expires an event a bit sooner than requested, account
314  for that here */
315  if (next && (now + bm->wheel_inaccuracy > bs->wheel_time_clocks ||
316  next < bs->wheel_time_clocks || !bs->wheel_time_clocks))
317  {
318  bs->wheel_time_clocks = next;
319  BFD_DBG ("timing_wheel_insert(%p, %lu (%ld clocks/%.2fs in the "
320  "future), %u);",
321  &bm->wheel, bs->wheel_time_clocks,
324  bm->cpu_cps, bs->bs_idx);
326  if (!handling_wakeup)
327  {
331  }
332  }
333 }
334 
335 static void
337  bfd_session_t * bs, u64 now,
338  u64 desired_min_tx_clocks)
339 {
340  bs->effective_desired_min_tx_clocks = desired_min_tx_clocks;
341  BFD_DBG ("Set effective desired min tx to " BFD_CLK_FMT,
342  BFD_CLK_PRN (bs->effective_desired_min_tx_clocks));
343  bfd_recalc_detection_time (bm, bs);
344  bfd_recalc_tx_interval (bm, bs);
346  bfd_calc_next_tx (bm, bs, now);
347 }
348 
349 static void
351  bfd_session_t * bs,
352  u64 required_min_rx_clocks)
353 {
354  bs->effective_required_min_rx_clocks = required_min_rx_clocks;
355  BFD_DBG ("Set effective required min rx to " BFD_CLK_FMT,
356  BFD_CLK_PRN (bs->effective_required_min_rx_clocks));
357  bfd_recalc_detection_time (bm, bs);
358 }
359 
360 static void
362  u64 now, u32 remote_required_min_rx_usec)
363 {
364  if (bs->remote_min_rx_usec != remote_required_min_rx_usec)
365  {
366  bs->remote_min_rx_usec = remote_required_min_rx_usec;
368  bfd_usec_to_clocks (bm, remote_required_min_rx_usec);
369  BFD_DBG ("Set remote min rx to " BFD_CLK_FMT,
370  BFD_CLK_PRN (bs->remote_min_rx_clocks));
371  bfd_recalc_detection_time (bm, bs);
372  bfd_recalc_tx_interval (bm, bs);
373  }
374 }
375 
376 static void
378  u64 now,
379  u32 remote_required_min_echo_rx_usec)
380 {
381  if (bs->remote_min_echo_rx_usec != remote_required_min_echo_rx_usec)
382  {
383  bs->remote_min_echo_rx_usec = remote_required_min_echo_rx_usec;
386  BFD_DBG ("Set remote min echo rx to " BFD_CLK_FMT,
387  BFD_CLK_PRN (bs->remote_min_echo_rx_clocks));
389  }
390 }
391 
392 static void
394  bfd_listen_event_e event, const bfd_session_t * bs)
395 {
396  bfd_notify_fn_t *fn;
397  vec_foreach (fn, bm->listeners)
398  {
399  (*fn) (event, bs);
400  }
401 }
402 
403 void
405 {
406  BFD_DBG ("\nStarting session: %U", format_bfd_session, bs);
407  vlib_log_info (bm->log_class, "start BFD session: %U",
411  bfd_recalc_tx_interval (bm, bs);
414  bfd_notify_listeners (bm, BFD_LISTEN_EVENT_CREATE, bs);
415 }
416 
417 void
419 {
420  bfd_main_t *bm = &bfd_main;
421  u64 now = clib_cpu_time_now ();
422  if (admin_up_down)
423  {
424  BFD_DBG ("Session set admin-up, bs-idx=%u", bs->bs_idx);
425  vlib_log_info (bm->log_class, "set session admin-up: %U",
427  bfd_set_state (bm, bs, BFD_STATE_down, 0);
428  bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
429  bfd_calc_next_tx (bm, bs, now);
430  bfd_set_timer (bm, bs, now, 0);
431  }
432  else
433  {
434  BFD_DBG ("Session set admin-down, bs-idx=%u", bs->bs_idx);
435  vlib_log_info (bm->log_class, "set session admin-down: %U",
437  bfd_set_diag (bs, BFD_DIAG_CODE_admin_down);
438  bfd_set_state (bm, bs, BFD_STATE_admin_down, 0);
439  bfd_calc_next_tx (bm, bs, now);
440  bfd_set_timer (bm, bs, now, 0);
441  }
442 }
443 
444 u8 *
445 bfd_input_format_trace (u8 * s, va_list * args)
446 {
447  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
448  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
449  const bfd_input_trace_t *t = va_arg (*args, bfd_input_trace_t *);
450  const bfd_pkt_t *pkt = (bfd_pkt_t *) t->data;
451  if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head))
452  {
453  s = format (s, "BFD v%u, diag=%u(%s), state=%u(%s),\n"
454  " flags=(P:%u, F:%u, C:%u, A:%u, D:%u, M:%u), "
455  "detect_mult=%u, length=%u\n",
458  bfd_pkt_get_state (pkt),
460  bfd_pkt_get_poll (pkt), bfd_pkt_get_final (pkt),
463  bfd_pkt_get_multipoint (pkt), pkt->head.detect_mult,
464  pkt->head.length);
465  if (t->len >= sizeof (bfd_pkt_t) &&
466  pkt->head.length >= sizeof (bfd_pkt_t))
467  {
468  s = format (s, " my discriminator: %u\n",
469  clib_net_to_host_u32 (pkt->my_disc));
470  s = format (s, " your discriminator: %u\n",
471  clib_net_to_host_u32 (pkt->your_disc));
472  s = format (s, " desired min tx interval: %u\n",
473  clib_net_to_host_u32 (pkt->des_min_tx));
474  s = format (s, " required min rx interval: %u\n",
475  clib_net_to_host_u32 (pkt->req_min_rx));
476  s = format (s, " required min echo rx interval: %u",
477  clib_net_to_host_u32 (pkt->req_min_echo_rx));
478  }
479  if (t->len >= sizeof (bfd_pkt_with_common_auth_t) &&
480  pkt->head.length >= sizeof (bfd_pkt_with_common_auth_t) &&
482  {
483  const bfd_pkt_with_common_auth_t *with_auth = (void *) pkt;
484  const bfd_auth_common_t *common = &with_auth->common_auth;
485  s = format (s, "\n auth len: %u\n", common->len);
486  s = format (s, " auth type: %u:%s\n", common->type,
487  bfd_auth_type_str (common->type));
488  if (t->len >= sizeof (bfd_pkt_with_sha1_auth_t) &&
489  pkt->head.length >= sizeof (bfd_pkt_with_sha1_auth_t) &&
490  (BFD_AUTH_TYPE_keyed_sha1 == common->type ||
491  BFD_AUTH_TYPE_meticulous_keyed_sha1 == common->type))
492  {
493  const bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt;
494  const bfd_auth_sha1_t *sha1 = &with_sha1->sha1_auth;
495  s = format (s, " seq num: %u\n",
496  clib_net_to_host_u32 (sha1->seq_num));
497  s = format (s, " key id: %u\n", sha1->key_id);
498  s = format (s, " hash: %U", format_hex_bytes, sha1->hash,
499  sizeof (sha1->hash));
500  }
501  }
502  else
503  {
504  s = format (s, "\n");
505  }
506  }
507 
508  return s;
509 }
510 
511 static void
513  int handling_wakeup)
514 {
515  BFD_DBG ("\nState changed: %U", format_bfd_session, bs);
516  bfd_event (bm, bs);
517  switch (bs->local_state)
518  {
519  case BFD_STATE_admin_down:
520  bs->echo = 0;
522  clib_max
527  bfd_set_timer (bm, bs, now, handling_wakeup);
528  break;
529  case BFD_STATE_down:
530  bs->echo = 0;
532  clib_max
537  bfd_set_timer (bm, bs, now, handling_wakeup);
538  break;
539  case BFD_STATE_init:
540  bs->echo = 0;
543  bfd_set_timer (bm, bs, now, handling_wakeup);
544  break;
545  case BFD_STATE_up:
548  if (BFD_POLL_NOT_NEEDED == bs->poll_state)
549  {
552  }
553  bfd_set_timer (bm, bs, now, handling_wakeup);
554  break;
555  }
556  bfd_notify_listeners (bm, BFD_LISTEN_EVENT_UPDATE, bs);
557 }
558 
559 static void
561  bfd_main_t * bm, bfd_session_t * bs, u64 now)
562 {
563  /*
564  * if remote demand mode is set and we need to do a poll, set the next
565  * timeout so that the session wakes up immediately
566  */
567  if (bs->remote_demand && BFD_POLL_NEEDED == bs->poll_state &&
569  {
570  bs->tx_timeout_clocks = now;
571  }
572  bfd_recalc_detection_time (bm, bs);
573  bfd_set_timer (bm, bs, now, 0);
574 }
575 
576 static void
578 {
579  switch (bs->transport)
580  {
581  case BFD_TRANSPORT_UDP4:
582  BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx);
583  bfd_add_udp4_transport (vm, bi, bs, 0 /* is_echo */ );
584  break;
585  case BFD_TRANSPORT_UDP6:
586  BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx);
587  bfd_add_udp6_transport (vm, bi, bs, 0 /* is_echo */ );
588  break;
589  }
590 }
591 
592 static int
594 {
595  switch (bs->transport)
596  {
597  case BFD_TRANSPORT_UDP4:
598  BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx);
599  return bfd_transport_udp4 (vm, bi, bs);
600  break;
601  case BFD_TRANSPORT_UDP6:
602  BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx);
603  return bfd_transport_udp6 (vm, bi, bs);
604  break;
605  }
606  return 0;
607 }
608 
609 static int
611 {
612  switch (bs->transport)
613  {
614  case BFD_TRANSPORT_UDP4:
615  BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx);
616  return bfd_add_udp4_transport (vm, bi, bs, 1 /* is_echo */ );
617  break;
618  case BFD_TRANSPORT_UDP6:
619  BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx);
620  return bfd_add_udp6_transport (vm, bi, bs, 1 /* is_echo */ );
621  break;
622  }
623  return 0;
624 }
625 
626 static int
628 {
629  switch (bs->transport)
630  {
631  case BFD_TRANSPORT_UDP4:
632  BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx);
633  return bfd_transport_udp4 (vm, bi, bs);
634  break;
635  case BFD_TRANSPORT_UDP6:
636  BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx);
637  return bfd_transport_udp6 (vm, bi, bs);
638  break;
639  }
640  return 0;
641 }
642 
643 #if WITH_LIBSSL > 0
644 static void
645 bfd_add_sha1_auth_section (vlib_buffer_t * b, bfd_session_t * bs)
646 {
647  bfd_pkt_with_sha1_auth_t *pkt = vlib_buffer_get_current (b);
648  bfd_auth_sha1_t *auth = &pkt->sha1_auth;
649  b->current_length += sizeof (*auth);
650  pkt->pkt.head.length += sizeof (*auth);
651  bfd_pkt_set_auth_present (&pkt->pkt);
652  memset (auth, 0, sizeof (*auth));
653  auth->type_len.type = bs->auth.curr_key->auth_type;
654  /*
655  * only meticulous authentication types require incrementing seq number
656  * for every message, but doing so doesn't violate the RFC
657  */
658  ++bs->auth.local_seq_number;
659  auth->type_len.len = sizeof (bfd_auth_sha1_t);
660  auth->key_id = bs->auth.curr_bfd_key_id;
661  auth->seq_num = clib_host_to_net_u32 (bs->auth.local_seq_number);
662  /*
663  * first copy the password into the packet, then calculate the hash
664  * and finally replace the password with the calculated hash
665  */
666  clib_memcpy (auth->hash, bs->auth.curr_key->key,
667  sizeof (bs->auth.curr_key->key));
668  unsigned char hash[sizeof (auth->hash)];
669  SHA1 ((unsigned char *) pkt, sizeof (*pkt), hash);
670  BFD_DBG ("hashing: %U", format_hex_bytes, pkt, sizeof (*pkt));
671  clib_memcpy (auth->hash, hash, sizeof (hash));
672 }
673 #endif
674 
675 static void
677 {
678  bfd_main_t *bm = &bfd_main;
679  if (bs->auth.curr_key)
680  {
681  const bfd_auth_type_e auth_type = bs->auth.curr_key->auth_type;
682  switch (auth_type)
683  {
684  case BFD_AUTH_TYPE_reserved:
685  /* fallthrough */
686  case BFD_AUTH_TYPE_simple_password:
687  /* fallthrough */
688  case BFD_AUTH_TYPE_keyed_md5:
689  /* fallthrough */
690  case BFD_AUTH_TYPE_meticulous_keyed_md5:
692  "internal error, unexpected BFD auth type '%d'",
693  auth_type);
694  break;
695 #if WITH_LIBSSL > 0
696  case BFD_AUTH_TYPE_keyed_sha1:
697  /* fallthrough */
698  case BFD_AUTH_TYPE_meticulous_keyed_sha1:
699  bfd_add_sha1_auth_section (b, bs);
700  break;
701 #else
702  case BFD_AUTH_TYPE_keyed_sha1:
703  /* fallthrough */
704  case BFD_AUTH_TYPE_meticulous_keyed_sha1:
706  "internal error, unexpected BFD auth type '%d'",
707  auth_type);
708  break;
709 #endif
710  }
711  }
712 }
713 
714 static int
716 {
717  if (BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state &&
718  bs->remote_min_echo_rx_usec > 0)
719  {
720  switch (bs->transport)
721  {
722  case BFD_TRANSPORT_UDP4:
723  return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP4);
724  case BFD_TRANSPORT_UDP6:
725  return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP6);
726  }
727  }
728  return 0;
729 }
730 
731 static void
733  vlib_buffer_t * b)
734 {
735  bfd_pkt_t *pkt = vlib_buffer_get_current (b);
736  u32 bfd_length = 0;
737  bfd_length = sizeof (bfd_pkt_t);
738  memset (pkt, 0, sizeof (*pkt));
739  bfd_pkt_set_version (pkt, 1);
741  bfd_pkt_set_state (pkt, bs->local_state);
742  pkt->head.detect_mult = bs->local_detect_mult;
743  pkt->head.length = bfd_length;
744  pkt->my_disc = bs->local_discr;
745  pkt->your_disc = bs->remote_discr;
746  pkt->des_min_tx = clib_host_to_net_u32 (bs->config_desired_min_tx_usec);
747  if (bs->echo)
748  {
749  pkt->req_min_rx =
750  clib_host_to_net_u32 (bfd_clocks_to_usec
752  }
753  else
754  {
755  pkt->req_min_rx =
756  clib_host_to_net_u32 (bs->config_required_min_rx_usec);
757  }
758  pkt->req_min_echo_rx = clib_host_to_net_u32 (1);
759  b->current_length = bfd_length;
760 }
761 
762 static void
764  bfd_main_t * bm, bfd_session_t * bs, u64 now)
765 {
766  if (!bfd_is_echo_possible (bs))
767  {
768  BFD_DBG ("\nSwitching off echo function: %U", format_bfd_session, bs);
769  bs->echo = 0;
770  return;
771  }
772  /* sometimes the wheel expires an event a bit sooner than requested,
773  account
774  for that here */
775  if (now + bm->wheel_inaccuracy >= bs->echo_tx_timeout_clocks)
776  {
777  BFD_DBG ("\nSending echo packet: %U", format_bfd_session, bs);
778  u32 bi;
779  if (vlib_buffer_alloc (vm, &bi, 1) != 1)
780  {
781  vlib_log_crit (bm->log_class, "buffer allocation failure");
782  return;
783  }
784  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
785  ASSERT (b->current_data == 0);
786  memset (vnet_buffer (b), 0, sizeof (*vnet_buffer (b)));
788  bfd_echo_pkt_t *pkt = vlib_buffer_get_current (b);
789  memset (pkt, 0, sizeof (*pkt));
790  pkt->discriminator = bs->local_discr;
791  pkt->expire_time_clocks =
793  pkt->checksum =
794  bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_clocks,
795  bs->echo_secret);
796  b->current_length = sizeof (*pkt);
797  if (!bfd_echo_add_transport_layer (vm, bi, bs))
798  {
799  BFD_ERR ("cannot send echo packet out, turning echo off");
800  bs->echo = 0;
801  vlib_buffer_free_one (vm, bi);
802  return;
803  }
804  if (!bfd_transport_echo (vm, bi, bs))
805  {
806  BFD_ERR ("cannot send echo packet out, turning echo off");
807  bs->echo = 0;
808  vlib_buffer_free_one (vm, bi);
809  return;
810  }
811  bs->echo_last_tx_clocks = now;
812  bfd_calc_next_echo_tx (bm, bs, now);
813  }
814  else
815  {
816  BFD_DBG
817  ("No need to send echo packet now, now is %lu, tx_timeout is %lu",
818  now, bs->echo_tx_timeout_clocks);
819  }
820 }
821 
822 static void
824  bfd_main_t * bm, bfd_session_t * bs, u64 now)
825 {
826  if (!bs->remote_min_rx_usec && BFD_POLL_NOT_NEEDED == bs->poll_state)
827  {
828  BFD_DBG ("Remote min rx interval is zero, not sending periodic control "
829  "frame");
830  return;
831  }
832  if (BFD_POLL_NOT_NEEDED == bs->poll_state && bs->remote_demand &&
833  BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state)
834  {
835  /*
836  * A system MUST NOT periodically transmit BFD Control packets if Demand
837  * mode is active on the remote system (bfd.RemoteDemandMode is 1,
838  * bfd.SessionState is Up, and bfd.RemoteSessionState is Up) and a Poll
839  * Sequence is not being transmitted.
840  */
841  BFD_DBG ("Remote demand is set, not sending periodic control frame");
842  return;
843  }
844  /*
845  * sometimes the wheel expires an event a bit sooner than requested, account
846  * for that here
847  */
848  if (now + bm->wheel_inaccuracy >= bs->tx_timeout_clocks)
849  {
850  BFD_DBG ("\nSending periodic control frame: %U", format_bfd_session,
851  bs);
852  u32 bi;
853  if (vlib_buffer_alloc (vm, &bi, 1) != 1)
854  {
855  vlib_log_crit (bm->log_class, "buffer allocation failure");
856  return;
857  }
858  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
859  ASSERT (b->current_data == 0);
860  memset (vnet_buffer (b), 0, sizeof (*vnet_buffer (b)));
862  bfd_init_control_frame (bm, bs, b);
863  switch (bs->poll_state)
864  {
865  case BFD_POLL_NEEDED:
866  if (now < bs->poll_state_start_or_timeout_clocks)
867  {
868  BFD_DBG ("Cannot start a poll sequence yet, need to wait "
869  "for " BFD_CLK_FMT,
870  BFD_CLK_PRN (bs->poll_state_start_or_timeout_clocks -
871  now));
872  break;
873  }
875  bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS);
876  /* fallthrough */
877  case BFD_POLL_IN_PROGRESS:
878  case BFD_POLL_IN_PROGRESS_AND_QUEUED:
880  BFD_DBG ("Setting poll bit in packet, bs_idx=%u", bs->bs_idx);
881  break;
882  case BFD_POLL_NOT_NEEDED:
883  /* fallthrough */
884  break;
885  }
886  bfd_add_auth_section (b, bs);
887  bfd_add_transport_layer (vm, bi, bs);
888  if (!bfd_transport_control_frame (vm, bi, bs))
889  {
890  vlib_buffer_free_one (vm, bi);
891  }
892  bs->last_tx_clocks = now;
893  bfd_calc_next_tx (bm, bs, now);
894  }
895  else
896  {
897  BFD_DBG
898  ("No need to send control frame now, now is %lu, tx_timeout is %lu",
899  now, bs->tx_timeout_clocks);
900  }
901 }
902 
903 void
905  bfd_main_t * bm, bfd_session_t * bs,
906  int is_local)
907 {
908  BFD_DBG ("Send final control frame for bs_idx=%lu", bs->bs_idx);
909  bfd_init_control_frame (bm, bs, b);
911  bfd_add_auth_section (b, bs);
912  u32 bi = vlib_get_buffer_index (vm, b);
913  bfd_add_transport_layer (vm, bi, bs);
915  /*
916  * RFC allows to include changes in final frame, so if there were any
917  * pending, we already did that, thus we can clear any pending poll needs
918  */
919  bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED);
920 }
921 
922 static void
924  int handling_wakeup)
925 {
926  /*
927  * sometimes the wheel expires an event a bit sooner than requested, account
928  * for that here
929  */
930  if (bs->last_rx_clocks + bs->detection_time_clocks <=
931  now + bm->wheel_inaccuracy)
932  {
933  BFD_DBG ("Rx timeout, session goes down");
934  bfd_set_diag (bs, BFD_DIAG_CODE_det_time_exp);
935  bfd_set_state (bm, bs, BFD_STATE_down, handling_wakeup);
936  /*
937  * If the remote system does not receive any
938  * BFD Control packets for a Detection Time, it SHOULD reset
939  * bfd.RemoteMinRxInterval to its initial value of 1 (per section 6.8.1,
940  * since it is no longer required to maintain previous session state)
941  * and then can transmit at its own rate.
942  */
943  bfd_set_remote_required_min_rx (bm, bs, now, 1);
944  }
945  else if (bs->echo &&
946  bs->echo_last_rx_clocks +
948  now + bm->wheel_inaccuracy)
949  {
950  BFD_DBG ("Echo rx timeout, session goes down");
951  bfd_set_diag (bs, BFD_DIAG_CODE_echo_failed);
952  bfd_set_state (bm, bs, BFD_STATE_down, handling_wakeup);
953  }
954 }
955 
956 void
958  bfd_session_t * bs, u64 now)
959 {
960  BFD_DBG ("Timeout for bs_idx=%lu", bs->bs_idx);
961  switch (bs->local_state)
962  {
963  case BFD_STATE_admin_down:
964  bfd_send_periodic (vm, rt, bm, bs, now);
965  break;
966  case BFD_STATE_down:
967  bfd_send_periodic (vm, rt, bm, bs, now);
968  break;
969  case BFD_STATE_init:
970  bfd_check_rx_timeout (bm, bs, now, 1);
971  bfd_send_periodic (vm, rt, bm, bs, now);
972  break;
973  case BFD_STATE_up:
974  bfd_check_rx_timeout (bm, bs, now, 1);
975  if (BFD_POLL_NOT_NEEDED == bs->poll_state && !bs->echo &&
977  {
978  /* switch on echo function as main detection method now */
979  BFD_DBG ("Switching on echo function, bs_idx=%u", bs->bs_idx);
980  bs->echo = 1;
981  bs->echo_last_rx_clocks = now;
982  bs->echo_tx_timeout_clocks = now;
984  clib_max
987  bfd_set_poll_state (bs, BFD_POLL_NEEDED);
988  }
989  bfd_send_periodic (vm, rt, bm, bs, now);
990  if (bs->echo)
991  {
992  bfd_send_echo (vm, rt, bm, bs, now);
993  }
994  break;
995  }
996 }
997 
998 /*
999  * bfd process node function
1000  */
1001 static uword
1003 {
1004  bfd_main_t *bm = &bfd_main;
1005  u32 *expired = 0;
1006  uword event_type, *event_data = 0;
1007 
1008  /* So we can send events to the bfd process */
1010 
1011  while (1)
1012  {
1013  u64 now = clib_cpu_time_now ();
1014  u64 next_expire = timing_wheel_next_expiring_elt_time (&bm->wheel);
1015  BFD_DBG ("timing_wheel_next_expiring_elt_time(%p) returns %lu",
1016  &bm->wheel, next_expire);
1017  if ((i64) next_expire < 0)
1018  {
1019  BFD_DBG ("wait for event without timeout");
1020  (void) vlib_process_wait_for_event (vm);
1021  event_type = vlib_process_get_events (vm, &event_data);
1022  }
1023  else
1024  {
1025  f64 timeout = ((i64) next_expire - (i64) now) / bm->cpu_cps;
1026  BFD_DBG ("wait for event with timeout %.02f", timeout);
1027  if (timeout < 0)
1028  {
1029  BFD_DBG ("negative timeout, already expired, skipping wait");
1030  event_type = ~0;
1031  }
1032  else
1033  {
1034  (void) vlib_process_wait_for_event_or_clock (vm, timeout);
1035  event_type = vlib_process_get_events (vm, &event_data);
1036  }
1037  }
1038  now = clib_cpu_time_now ();
1039  switch (event_type)
1040  {
1041  case ~0: /* no events => timeout */
1042  /* nothing to do here */
1043  break;
1044  case BFD_EVENT_RESCHEDULE:
1045  /* nothing to do here - reschedule is done automatically after
1046  * each event or timeout */
1047  break;
1048  case BFD_EVENT_NEW_SESSION:
1049  if (!pool_is_free_index (bm->sessions, *event_data))
1050  {
1051  bfd_session_t *bs =
1052  pool_elt_at_index (bm->sessions, *event_data);
1053  bfd_send_periodic (vm, rt, bm, bs, now);
1054  bfd_set_timer (bm, bs, now, 1);
1055  }
1056  else
1057  {
1058  BFD_DBG ("Ignoring event for non-existent session index %u",
1059  (u32) * event_data);
1060  }
1061  break;
1063  if (!pool_is_free_index (bm->sessions, *event_data))
1064  {
1065  bfd_session_t *bs =
1066  pool_elt_at_index (bm->sessions, *event_data);
1067  bfd_on_config_change (vm, rt, bm, bs, now);
1068  }
1069  else
1070  {
1071  BFD_DBG ("Ignoring event for non-existent session index %u",
1072  (u32) * event_data);
1073  }
1074  break;
1075  default:
1076  vlib_log_err (bm->log_class, "BUG: event type 0x%wx", event_type);
1077  break;
1078  }
1079  BFD_DBG ("advancing wheel, now is %lu", now);
1080  BFD_DBG ("timing_wheel_advance (%p, %lu, %p, 0);", &bm->wheel, now,
1081  expired);
1082  expired = timing_wheel_advance (&bm->wheel, now, expired, 0);
1083  BFD_DBG ("Expired %d elements", vec_len (expired));
1084  u32 *p = NULL;
1085  vec_foreach (p, expired)
1086  {
1087  const u32 bs_idx = *p;
1088  if (!pool_is_free_index (bm->sessions, bs_idx))
1089  {
1090  bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
1091  bfd_on_timeout (vm, rt, bm, bs, now);
1092  bfd_set_timer (bm, bs, now, 1);
1093  }
1094  }
1095  if (expired)
1096  {
1097  _vec_len (expired) = 0;
1098  }
1099  if (event_data)
1100  {
1101  _vec_len (event_data) = 0;
1102  }
1103  }
1104 
1105  return 0;
1106 }
1107 
1108 /*
1109  * bfd process node declaration
1110  */
1111 /* *INDENT-OFF* */
1113  .function = bfd_process,
1114  .type = VLIB_NODE_TYPE_PROCESS,
1115  .name = "bfd-process",
1116  .n_next_nodes = 0,
1117  .next_nodes = {},
1118 };
1119 /* *INDENT-ON* */
1120 
1121 static clib_error_t *
1123 {
1124  // bfd_main_t *bm = &bfd_main;
1125  // vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1126  if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1127  {
1128  /* TODO */
1129  }
1130  return 0;
1131 }
1132 
1134 
1135 static clib_error_t *
1137 {
1138  // bfd_main_t *bm = &bfd_main;
1139  if (flags & VNET_HW_INTERFACE_FLAG_LINK_UP)
1140  {
1141  /* TODO */
1142  }
1143  return 0;
1144 }
1145 
1147 
1148 void
1150 {
1151  bfd_main_t *bm = &bfd_main;
1152 
1153  vec_add1 (bm->listeners, fn);
1154 }
1155 
1156 /*
1157  * setup function
1158  */
1159 static clib_error_t *
1161 {
1162 #if BFD_DEBUG
1163  setbuf (stdout, NULL);
1164 #endif
1165  bfd_main_t *bm = &bfd_main;
1167  bm->vlib_main = vm;
1168  bm->vnet_main = vnet_get_main ();
1169  memset (&bm->wheel, 0, sizeof (bm->wheel));
1171  BFD_DBG ("cps is %.2f", bm->cpu_cps);
1176  const u64 now = clib_cpu_time_now ();
1177  timing_wheel_init (&bm->wheel, now, bm->cpu_cps);
1179  bm->log_class = vlib_log_register_class ("bfd", 0);
1180  vlib_log_debug (bm->log_class, "initialized");
1181  return 0;
1182 }
1183 
1185 
1186 bfd_session_t *
1188 {
1189  bfd_session_t *result;
1190  pool_get (bm->sessions, result);
1191  memset (result, 0, sizeof (*result));
1192  result->bs_idx = result - bm->sessions;
1193  result->transport = t;
1194  const unsigned limit = 1000;
1195  unsigned counter = 0;
1196  do
1197  {
1198  result->local_discr = random_u32 (&bm->random_seed);
1199  if (counter > limit)
1200  {
1201  vlib_log_crit (bm->log_class,
1202  "couldn't allocate unused session discriminator even "
1203  "after %u tries!", limit);
1204  pool_put (bm->sessions, result);
1205  return NULL;
1206  }
1207  ++counter;
1208  }
1209  while (hash_get (bm->session_by_disc, result->local_discr));
1210  bfd_set_defaults (bm, result);
1211  hash_set (bm->session_by_disc, result->local_discr, result->bs_idx);
1212  return result;
1213 }
1214 
1215 void
1217 {
1218  vlib_log_info (bm->log_class, "delete session: %U",
1220  bfd_notify_listeners (bm, BFD_LISTEN_EVENT_DELETE, bs);
1221  if (bs->auth.curr_key)
1222  {
1223  --bs->auth.curr_key->use_count;
1224  }
1225  if (bs->auth.next_key)
1226  {
1227  --bs->auth.next_key->use_count;
1228  }
1230  pool_put (bm->sessions, bs);
1231 }
1232 
1233 bfd_session_t *
1235 {
1236  if (!pool_is_free_index (bm->sessions, bs_idx))
1237  {
1238  return pool_elt_at_index (bm->sessions, bs_idx);
1239  }
1240  return NULL;
1241 }
1242 
1243 bfd_session_t *
1245 {
1246  uword *p = hash_get (bfd_main.session_by_disc, disc);
1247  if (p)
1248  {
1249  return pool_elt_at_index (bfd_main.sessions, *p);
1250  }
1251  return NULL;
1252 }
1253 
1254 /**
1255  * @brief verify bfd packet - common checks
1256  *
1257  * @param pkt
1258  *
1259  * @return 1 if bfd packet is valid
1260  */
1261 int
1262 bfd_verify_pkt_common (const bfd_pkt_t * pkt)
1263 {
1264  if (1 != bfd_pkt_get_version (pkt))
1265  {
1266  BFD_ERR ("BFD verification failed - unexpected version: '%d'",
1267  bfd_pkt_get_version (pkt));
1268  return 0;
1269  }
1270  if (pkt->head.length < sizeof (bfd_pkt_t) ||
1271  (bfd_pkt_get_auth_present (pkt) &&
1272  pkt->head.length < sizeof (bfd_pkt_with_common_auth_t)))
1273  {
1274  BFD_ERR ("BFD verification failed - unexpected length: '%d' (auth "
1275  "present: %d)",
1276  pkt->head.length, bfd_pkt_get_auth_present (pkt));
1277  return 0;
1278  }
1279  if (!pkt->head.detect_mult)
1280  {
1281  BFD_ERR ("BFD verification failed - unexpected detect-mult: '%d'",
1282  pkt->head.detect_mult);
1283  return 0;
1284  }
1285  if (bfd_pkt_get_multipoint (pkt))
1286  {
1287  BFD_ERR ("BFD verification failed - unexpected multipoint: '%d'",
1288  bfd_pkt_get_multipoint (pkt));
1289  return 0;
1290  }
1291  if (!pkt->my_disc)
1292  {
1293  BFD_ERR ("BFD verification failed - unexpected my-disc: '%d'",
1294  pkt->my_disc);
1295  return 0;
1296  }
1297  if (!pkt->your_disc)
1298  {
1299  const u8 pkt_state = bfd_pkt_get_state (pkt);
1300  if (pkt_state != BFD_STATE_down && pkt_state != BFD_STATE_admin_down)
1301  {
1302  BFD_ERR ("BFD verification failed - unexpected state: '%s' "
1303  "(your-disc is zero)", bfd_state_string (pkt_state));
1304  return 0;
1305  }
1306  }
1307  return 1;
1308 }
1309 
1310 static void
1312 {
1313  BFD_DBG ("Switching authentication key from %U to %U for bs_idx=%u",
1315  bs->auth.next_key, bs->bs_idx);
1316  bs->auth.is_delayed = 0;
1317  if (bs->auth.curr_key)
1318  {
1319  --bs->auth.curr_key->use_count;
1320  }
1321  bs->auth.curr_key = bs->auth.next_key;
1322  bs->auth.next_key = NULL;
1324 }
1325 
1326 static int
1328 {
1329  if (BFD_AUTH_TYPE_meticulous_keyed_md5 == auth_type ||
1330  BFD_AUTH_TYPE_meticulous_keyed_sha1 == auth_type)
1331  {
1332  return 1;
1333  }
1334  return 0;
1335 }
1336 
1337 static int
1339  u32 received_seq_num, int is_meticulous)
1340 {
1341  /*
1342  * RFC 5880 6.8.1:
1343  *
1344  * This variable MUST be set to zero after no packets have been
1345  * received on this session for at least twice the Detection Time.
1346  */
1347  u64 now = clib_cpu_time_now ();
1348  if (now - bs->last_rx_clocks > bs->detection_time_clocks * 2)
1349  {
1350  BFD_DBG ("BFD peer unresponsive for %lu clocks, which is > 2 * "
1351  "detection_time=%u clocks, resetting remote_seq_number_known "
1352  "flag",
1353  now - bs->last_rx_clocks, bs->detection_time_clocks * 2);
1354  bs->auth.remote_seq_number_known = 0;
1355  }
1356  if (bs->auth.remote_seq_number_known)
1357  {
1358  /* remote sequence number is known, verify its validity */
1359  const u32 max_u32 = 0xffffffff;
1360  /* the calculation might wrap, account for the special case... */
1361  if (bs->auth.remote_seq_number > max_u32 - 3 * bs->local_detect_mult)
1362  {
1363  /*
1364  * special case
1365  *
1366  * x y z
1367  * |----------+----------------------------+-----------|
1368  * 0 ^ ^ 0xffffffff
1369  * | remote_seq_num------+
1370  * |
1371  * +-----(remote_seq_num + 3*detect_mult) % * 0xffffffff
1372  *
1373  * x + y + z = 0xffffffff
1374  * x + z = 3 * detect_mult
1375  */
1376  const u32 z = max_u32 - bs->auth.remote_seq_number;
1377  const u32 x = 3 * bs->local_detect_mult - z;
1378  if (received_seq_num > x &&
1379  received_seq_num < bs->auth.remote_seq_number + is_meticulous)
1380  {
1381  BFD_ERR
1382  ("Recvd sequence number=%u out of ranges <0, %u>, <%u, %u>",
1383  received_seq_num, x,
1384  bs->auth.remote_seq_number + is_meticulous, max_u32);
1385  return 0;
1386  }
1387  }
1388  else
1389  {
1390  /* regular case */
1391  const u32 min = bs->auth.remote_seq_number + is_meticulous;
1392  const u32 max =
1394  if (received_seq_num < min || received_seq_num > max)
1395  {
1396  BFD_ERR ("Recvd sequence number=%u out of range <%u, %u>",
1397  received_seq_num, min, max);
1398  return 0;
1399  }
1400  }
1401  }
1402  return 1;
1403 }
1404 
1405 static int
1406 bfd_verify_pkt_auth_key_sha1 (const bfd_pkt_t * pkt, u32 pkt_size,
1407  bfd_session_t * bs, u8 bfd_key_id,
1408  bfd_auth_key_t * auth_key)
1409 {
1410  ASSERT (auth_key->auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
1411  auth_key->auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1);
1412 
1413  u8 result[SHA_DIGEST_LENGTH];
1414  bfd_pkt_with_common_auth_t *with_common = (void *) pkt;
1415  if (pkt_size < sizeof (*with_common))
1416  {
1417  BFD_ERR ("Packet size too small to hold authentication common header");
1418  return 0;
1419  }
1420  if (with_common->common_auth.type != auth_key->auth_type)
1421  {
1422  BFD_ERR ("BFD auth type mismatch, packet auth=%d:%s doesn't match "
1423  "in-use auth=%d:%s",
1424  with_common->common_auth.type,
1425  bfd_auth_type_str (with_common->common_auth.type),
1426  auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
1427  return 0;
1428  }
1429  bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt;
1430  if (pkt_size < sizeof (*with_sha1) ||
1431  with_sha1->sha1_auth.type_len.len < sizeof (with_sha1->sha1_auth))
1432  {
1433  BFD_ERR
1434  ("BFD size mismatch, payload size=%u, expected=%u, auth_len=%u, "
1435  "expected=%u", pkt_size, sizeof (*with_sha1),
1436  with_sha1->sha1_auth.type_len.len, sizeof (with_sha1->sha1_auth));
1437  return 0;
1438  }
1439  if (with_sha1->sha1_auth.key_id != bfd_key_id)
1440  {
1441  BFD_ERR
1442  ("BFD key ID mismatch, packet key ID=%u doesn't match key ID=%u%s",
1443  with_sha1->sha1_auth.key_id, bfd_key_id,
1444  bs->
1445  auth.is_delayed ? " (but a delayed auth change is scheduled)" : "");
1446  return 0;
1447  }
1448  SHA_CTX ctx;
1449  if (!SHA1_Init (&ctx))
1450  {
1451  BFD_ERR ("SHA1_Init failed");
1452  return 0;
1453  }
1454  /* ignore last 20 bytes - use the actual key data instead pkt data */
1455  if (!SHA1_Update (&ctx, with_sha1,
1456  sizeof (*with_sha1) - sizeof (with_sha1->sha1_auth.hash)))
1457  {
1458  BFD_ERR ("SHA1_Update failed");
1459  return 0;
1460  }
1461  if (!SHA1_Update (&ctx, auth_key->key, sizeof (auth_key->key)))
1462  {
1463  BFD_ERR ("SHA1_Update failed");
1464  return 0;
1465  }
1466  if (!SHA1_Final (result, &ctx))
1467  {
1468  BFD_ERR ("SHA1_Final failed");
1469  return 0;
1470  }
1471  if (0 == memcmp (result, with_sha1->sha1_auth.hash, SHA_DIGEST_LENGTH))
1472  {
1473  return 1;
1474  }
1475  BFD_ERR ("SHA1 hash: %U doesn't match the expected value: %U",
1476  format_hex_bytes, with_sha1->sha1_auth.hash, SHA_DIGEST_LENGTH,
1477  format_hex_bytes, result, SHA_DIGEST_LENGTH);
1478  return 0;
1479 }
1480 
1481 static int
1482 bfd_verify_pkt_auth_key (const bfd_pkt_t * pkt, u32 pkt_size,
1483  bfd_session_t * bs, u8 bfd_key_id,
1484  bfd_auth_key_t * auth_key)
1485 {
1486  bfd_main_t *bm = &bfd_main;
1487  switch (auth_key->auth_type)
1488  {
1489  case BFD_AUTH_TYPE_reserved:
1490  vlib_log_err (bm->log_class,
1491  "internal error, unexpected auth_type=%d:%s",
1492  auth_key->auth_type,
1493  bfd_auth_type_str (auth_key->auth_type));
1494  return 0;
1495  case BFD_AUTH_TYPE_simple_password:
1496  vlib_log_err (bm->log_class,
1497  "internal error, not implemented, unexpected auth_type=%d:%s",
1498  auth_key->auth_type,
1499  bfd_auth_type_str (auth_key->auth_type));
1500  return 0;
1501  case BFD_AUTH_TYPE_keyed_md5:
1502  /* fallthrough */
1503  case BFD_AUTH_TYPE_meticulous_keyed_md5:
1504  vlib_log_err
1505  (bm->log_class,
1506  "internal error, not implemented, unexpected auth_type=%d:%s",
1507  auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
1508  return 0;
1509  case BFD_AUTH_TYPE_keyed_sha1:
1510  /* fallthrough */
1511  case BFD_AUTH_TYPE_meticulous_keyed_sha1:
1512 #if WITH_LIBSSL > 0
1513  do
1514  {
1515  const u32 seq_num = clib_net_to_host_u32 (((bfd_pkt_with_sha1_auth_t
1516  *) pkt)->
1517  sha1_auth.seq_num);
1518  return bfd_verify_pkt_auth_seq_num (bs, seq_num,
1520  (auth_key->auth_type))
1521  && bfd_verify_pkt_auth_key_sha1 (pkt, pkt_size, bs, bfd_key_id,
1522  auth_key);
1523  }
1524  while (0);
1525 #else
1526  vlib_log_err
1527  (bm->log_class,
1528  "internal error, attempt to use SHA1 without SSL support");
1529  return 0;
1530 #endif
1531  }
1532  return 0;
1533 }
1534 
1535 /**
1536  * @brief verify bfd packet - authentication
1537  *
1538  * @param pkt
1539  *
1540  * @return 1 if bfd packet is valid
1541  */
1542 int
1543 bfd_verify_pkt_auth (const bfd_pkt_t * pkt, u16 pkt_size, bfd_session_t * bs)
1544 {
1545  if (bfd_pkt_get_auth_present (pkt))
1546  {
1547  /* authentication present in packet */
1548  if (!bs->auth.curr_key)
1549  {
1550  /* currently not using authentication - can we turn it on? */
1551  if (bs->auth.is_delayed && bs->auth.next_key)
1552  {
1553  /* yes, switch is scheduled - make sure the auth is valid */
1554  if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs,
1555  bs->auth.next_bfd_key_id,
1556  bs->auth.next_key))
1557  {
1558  /* auth matches next key, do the switch, packet is valid */
1560  return 1;
1561  }
1562  }
1563  }
1564  else
1565  {
1566  /* yes, using authentication, verify the key */
1567  if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs,
1568  bs->auth.curr_bfd_key_id,
1569  bs->auth.curr_key))
1570  {
1571  /* verification passed, packet is valid */
1572  return 1;
1573  }
1574  else
1575  {
1576  /* verification failed - but maybe we need to switch key */
1577  if (bs->auth.is_delayed && bs->auth.next_key)
1578  {
1579  /* delayed switch present, verify if that key works */
1580  if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs,
1581  bs->auth.next_bfd_key_id,
1582  bs->auth.next_key))
1583  {
1584  /* auth matches next key, switch key, packet is valid */
1586  return 1;
1587  }
1588  }
1589  }
1590  }
1591  }
1592  else
1593  {
1594  /* authentication in packet not present */
1595  if (pkt_size > sizeof (*pkt))
1596  {
1597  BFD_ERR ("BFD verification failed - unexpected packet size '%d' "
1598  "(auth not present)", pkt_size);
1599  return 0;
1600  }
1601  if (bs->auth.curr_key)
1602  {
1603  /* currently authenticating - could we turn it off? */
1604  if (bs->auth.is_delayed && !bs->auth.next_key)
1605  {
1606  /* yes, delayed switch to NULL key is scheduled */
1608  return 1;
1609  }
1610  }
1611  else
1612  {
1613  /* no auth in packet, no auth in use - packet is valid */
1614  return 1;
1615  }
1616  }
1617  return 0;
1618 }
1619 
1620 void
1621 bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx)
1622 {
1623  bfd_session_t *bs = bfd_find_session_by_idx (bm, bs_idx);
1624  if (!bs || (pkt->your_disc && pkt->your_disc != bs->local_discr))
1625  {
1626  return;
1627  }
1628  BFD_DBG ("Scanning bfd packet, bs_idx=%d", bs->bs_idx);
1629  bs->remote_discr = pkt->my_disc;
1630  bs->remote_state = bfd_pkt_get_state (pkt);
1631  bs->remote_demand = bfd_pkt_get_demand (pkt);
1632  bs->remote_diag = bfd_pkt_get_diag_code (pkt);
1633  u64 now = clib_cpu_time_now ();
1634  bs->last_rx_clocks = now;
1635  if (bfd_pkt_get_auth_present (pkt))
1636  {
1637  bfd_auth_type_e auth_type =
1638  ((bfd_pkt_with_common_auth_t *) (pkt))->common_auth.type;
1639  switch (auth_type)
1640  {
1641  case BFD_AUTH_TYPE_reserved:
1642  /* fallthrough */
1643  case BFD_AUTH_TYPE_simple_password:
1644  /* fallthrough */
1645  case BFD_AUTH_TYPE_keyed_md5:
1646  /* fallthrough */
1647  case BFD_AUTH_TYPE_meticulous_keyed_md5:
1648  vlib_log_crit (bm->log_class,
1649  "internal error, unexpected auth_type=%d:%s",
1650  auth_type, bfd_auth_type_str (auth_type));
1651  break;
1652  case BFD_AUTH_TYPE_keyed_sha1:
1653  /* fallthrough */
1654  case BFD_AUTH_TYPE_meticulous_keyed_sha1:
1655  do
1656  {
1657  bfd_pkt_with_sha1_auth_t *with_sha1 =
1658  (bfd_pkt_with_sha1_auth_t *) pkt;
1659  bs->auth.remote_seq_number =
1660  clib_net_to_host_u32 (with_sha1->sha1_auth.seq_num);
1661  bs->auth.remote_seq_number_known = 1;
1662  BFD_DBG ("Received sequence number %u",
1663  bs->auth.remote_seq_number);
1664  }
1665  while (0);
1666  }
1667  }
1669  bfd_usec_to_clocks (bm, clib_net_to_host_u32 (pkt->des_min_tx));
1670  bs->remote_detect_mult = pkt->head.detect_mult;
1671  bfd_set_remote_required_min_rx (bm, bs, now,
1672  clib_net_to_host_u32 (pkt->req_min_rx));
1674  clib_net_to_host_u32
1675  (pkt->req_min_echo_rx));
1676  if (bfd_pkt_get_final (pkt))
1677  {
1678  if (BFD_POLL_IN_PROGRESS == bs->poll_state)
1679  {
1680  BFD_DBG ("Poll sequence terminated, bs_idx=%u", bs->bs_idx);
1681  bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED);
1682  if (BFD_STATE_up == bs->local_state)
1683  {
1685  clib_max (bs->echo *
1688  }
1689  }
1690  else if (BFD_POLL_IN_PROGRESS_AND_QUEUED == bs->poll_state)
1691  {
1692  /*
1693  * next poll sequence must be delayed by at least the round trip
1694  * time, so calculate that here
1695  */
1696  BFD_DBG ("Next poll sequence can commence in " BFD_CLK_FMT,
1697  BFD_CLK_PRN (now -
1700  now + (now - bs->poll_state_start_or_timeout_clocks);
1701  BFD_DBG
1702  ("Poll sequence terminated, but another is needed, bs_idx=%u",
1703  bs->bs_idx);
1704  bfd_set_poll_state (bs, BFD_POLL_NEEDED);
1705  }
1706  }
1707  bfd_calc_next_tx (bm, bs, now);
1708  bfd_set_timer (bm, bs, now, 0);
1709  if (BFD_STATE_admin_down == bs->local_state)
1710  {
1711  BFD_DBG ("Session is admin-down, ignoring packet, bs_idx=%u",
1712  bs->bs_idx);
1713  return;
1714  }
1715  if (BFD_STATE_admin_down == bs->remote_state)
1716  {
1717  bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
1718  bfd_set_state (bm, bs, BFD_STATE_down, 0);
1719  }
1720  else if (BFD_STATE_down == bs->local_state)
1721  {
1722  if (BFD_STATE_down == bs->remote_state)
1723  {
1724  bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
1725  bfd_set_state (bm, bs, BFD_STATE_init, 0);
1726  }
1727  else if (BFD_STATE_init == bs->remote_state)
1728  {
1729  bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
1730  bfd_set_state (bm, bs, BFD_STATE_up, 0);
1731  }
1732  }
1733  else if (BFD_STATE_init == bs->local_state)
1734  {
1735  if (BFD_STATE_up == bs->remote_state ||
1736  BFD_STATE_init == bs->remote_state)
1737  {
1738  bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
1739  bfd_set_state (bm, bs, BFD_STATE_up, 0);
1740  }
1741  }
1742  else /* BFD_STATE_up == bs->local_state */
1743  {
1744  if (BFD_STATE_down == bs->remote_state)
1745  {
1746  bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
1747  bfd_set_state (bm, bs, BFD_STATE_down, 0);
1748  }
1749  }
1750 }
1751 
1752 int
1754 {
1755  bfd_echo_pkt_t *pkt = NULL;
1756  if (b->current_length != sizeof (*pkt))
1757  {
1758  return 0;
1759  }
1760  pkt = vlib_buffer_get_current (b);
1761  bfd_session_t *bs = bfd_find_session_by_disc (bm, pkt->discriminator);
1762  if (!bs)
1763  {
1764  return 0;
1765  }
1766  BFD_DBG ("Scanning bfd echo packet, bs_idx=%d", bs->bs_idx);
1767  u64 checksum =
1768  bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_clocks,
1769  bs->echo_secret);
1770  if (checksum != pkt->checksum)
1771  {
1772  BFD_DBG ("Invalid echo packet, checksum mismatch");
1773  return 1;
1774  }
1775  u64 now = clib_cpu_time_now ();
1776  if (pkt->expire_time_clocks < now)
1777  {
1778  BFD_DBG ("Stale packet received, expire time %lu < now %lu",
1779  pkt->expire_time_clocks, now);
1780  }
1781  else
1782  {
1783  bs->echo_last_rx_clocks = now;
1784  }
1785  return 1;
1786 }
1787 
1788 u8 *
1789 format_bfd_session (u8 * s, va_list * args)
1790 {
1791  const bfd_session_t *bs = va_arg (*args, bfd_session_t *);
1792  u32 indent = format_get_indent (s) + vlib_log_get_indent ();
1793  s = format (s, "bs_idx=%u local-state=%s remote-state=%s\n"
1794  "%Ulocal-discriminator=%u remote-discriminator=%u\n"
1795  "%Ulocal-diag=%s echo-active=%s\n"
1796  "%Udesired-min-tx=%u required-min-rx=%u\n"
1797  "%Urequired-min-echo-rx=%u detect-mult=%u\n"
1798  "%Uremote-min-rx=%u remote-min-echo-rx=%u\n"
1799  "%Uremote-demand=%s poll-state=%s\n"
1800  "%Uauth: local-seq-num=%u remote-seq-num=%u\n"
1801  "%U is-delayed=%s\n"
1802  "%U curr-key=%U\n"
1803  "%U next-key=%U",
1804  bs->bs_idx, bfd_state_string (bs->local_state),
1806  bs->local_discr, bs->remote_discr, format_white_space, indent,
1808  (bs->echo ? "yes" : "no"), format_white_space, indent,
1810  format_white_space, indent, 1, bs->local_detect_mult,
1813  (bs->remote_demand ? "yes" : "no"),
1815  indent, bs->auth.local_seq_number, bs->auth.remote_seq_number,
1816  format_white_space, indent,
1817  (bs->auth.is_delayed ? "yes" : "no"), format_white_space,
1818  indent, format_bfd_auth_key, bs->auth.curr_key,
1820  bs->auth.next_key);
1821  return s;
1822 }
1823 
1824 u8 *
1825 format_bfd_session_brief (u8 * s, va_list * args)
1826 {
1827  const bfd_session_t *bs = va_arg (*args, bfd_session_t *);
1828  s =
1829  format (s, "bs_idx=%u local-state=%s remote-state=%s", bs->bs_idx,
1832  return s;
1833 }
1834 
1835 unsigned
1837 {
1838  if (auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
1839  auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1)
1840  {
1841  return 1;
1842  }
1843  return 0;
1844 }
1845 
1848  u8 bfd_key_id, u8 is_delayed)
1849 {
1850  bfd_main_t *bm = &bfd_main;
1851  const uword *key_idx_p =
1852  hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
1853  if (!key_idx_p)
1854  {
1855  vlib_log_err (bm->log_class,
1856  "authentication key with config ID %u doesn't exist)",
1857  conf_key_id);
1858  return VNET_API_ERROR_BFD_ENOENT;
1859  }
1860  const uword key_idx = *key_idx_p;
1861  bfd_auth_key_t *key = pool_elt_at_index (bm->auth_keys, key_idx);
1862  if (is_delayed)
1863  {
1864  if (bs->auth.next_key == key)
1865  {
1866  /* already using this key, no changes required */
1867  return 0;
1868  }
1869  bs->auth.next_key = key;
1870  bs->auth.next_bfd_key_id = bfd_key_id;
1871  bs->auth.is_delayed = 1;
1872  }
1873  else
1874  {
1875  if (bs->auth.curr_key == key)
1876  {
1877  /* already using this key, no changes required */
1878  return 0;
1879  }
1880  if (bs->auth.curr_key)
1881  {
1882  --bs->auth.curr_key->use_count;
1883  }
1884  bs->auth.curr_key = key;
1885  bs->auth.curr_bfd_key_id = bfd_key_id;
1886  bs->auth.is_delayed = 0;
1887  }
1888  ++key->use_count;
1889  BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs);
1890  vlib_log_info (bm->log_class, "session auth modified: %U",
1892  return 0;
1893 }
1894 
1897 {
1898  bfd_main_t *bm = &bfd_main;
1899 #if WITH_LIBSSL > 0
1900  if (!is_delayed)
1901  {
1902  /* not delayed - deactivate the current key right now */
1903  if (bs->auth.curr_key)
1904  {
1905  --bs->auth.curr_key->use_count;
1906  bs->auth.curr_key = NULL;
1907  }
1908  bs->auth.is_delayed = 0;
1909  }
1910  else
1911  {
1912  /* delayed - mark as so */
1913  bs->auth.is_delayed = 1;
1914  }
1915  /*
1916  * clear the next key unconditionally - either the auth change is not delayed
1917  * in which case the caller expects the session to not use authentication
1918  * from this point forward, or it is delayed, in which case the next_key
1919  * needs to be set to NULL to make it so in the future
1920  */
1921  if (bs->auth.next_key)
1922  {
1923  --bs->auth.next_key->use_count;
1924  bs->auth.next_key = NULL;
1925  }
1926  BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs);
1927  vlib_log_info (bm->log_class, "session auth modified: %U",
1929  return 0;
1930 #else
1931  vlib_log_err (bm->log_class,
1932  "SSL missing, cannot deactivate BFD authentication");
1933  return VNET_API_ERROR_BFD_NOTSUPP;
1934 #endif
1935 }
1936 
1939  u32 desired_min_tx_usec,
1940  u32 required_min_rx_usec, u8 detect_mult)
1941 {
1942  if (bs->local_detect_mult != detect_mult ||
1943  bs->config_desired_min_tx_usec != desired_min_tx_usec ||
1944  bs->config_required_min_rx_usec != required_min_rx_usec)
1945  {
1946  BFD_DBG ("\nChanging session params: %U", format_bfd_session, bs);
1947  switch (bs->poll_state)
1948  {
1949  case BFD_POLL_NOT_NEEDED:
1950  if (BFD_STATE_up == bs->local_state ||
1951  BFD_STATE_init == bs->local_state)
1952  {
1953  /* poll sequence is not needed for detect multiplier change */
1954  if (bs->config_desired_min_tx_usec != desired_min_tx_usec ||
1955  bs->config_required_min_rx_usec != required_min_rx_usec)
1956  {
1957  bfd_set_poll_state (bs, BFD_POLL_NEEDED);
1958  }
1959  }
1960  break;
1961  case BFD_POLL_NEEDED:
1962  case BFD_POLL_IN_PROGRESS_AND_QUEUED:
1963  /*
1964  * nothing to do - will be handled in the future poll which is
1965  * already scheduled for execution
1966  */
1967  break;
1968  case BFD_POLL_IN_PROGRESS:
1969  /* poll sequence is not needed for detect multiplier change */
1970  if (bs->config_desired_min_tx_usec != desired_min_tx_usec ||
1971  bs->config_required_min_rx_usec != required_min_rx_usec)
1972  {
1973  BFD_DBG ("Poll in progress, queueing extra poll, bs_idx=%u",
1974  bs->bs_idx);
1975  bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS_AND_QUEUED);
1976  }
1977  }
1978 
1979  bs->local_detect_mult = detect_mult;
1980  bs->config_desired_min_tx_usec = desired_min_tx_usec;
1982  bfd_usec_to_clocks (bm, desired_min_tx_usec);
1983  bs->config_required_min_rx_usec = required_min_rx_usec;
1985  bfd_usec_to_clocks (bm, required_min_rx_usec);
1986  BFD_DBG ("\nChanged session params: %U", format_bfd_session, bs);
1987 
1988  vlib_log_info (bm->log_class, "changed session params: %U",
1992  }
1993  else
1994  {
1995  BFD_DBG ("Ignore parameter change - no change, bs_idx=%u", bs->bs_idx);
1996  }
1997  return 0;
1998 }
1999 
2001 bfd_auth_set_key (u32 conf_key_id, u8 auth_type, u8 key_len,
2002  const u8 * key_data)
2003 {
2004  bfd_main_t *bm = &bfd_main;
2005 #if WITH_LIBSSL > 0
2006  bfd_auth_key_t *auth_key = NULL;
2007  if (!key_len || key_len > bfd_max_key_len_for_auth_type (auth_type))
2008  {
2009  vlib_log_err (bm->log_class,
2010  "invalid authentication key length for auth_type=%d:%s "
2011  "(key_len=%u, must be non-zero, expected max=%u)",
2012  auth_type, bfd_auth_type_str (auth_type), key_len,
2013  (u32) bfd_max_key_len_for_auth_type (auth_type));
2014  return VNET_API_ERROR_INVALID_VALUE;
2015  }
2016  if (!bfd_auth_type_supported (auth_type))
2017  {
2018  vlib_log_err (bm->log_class, "unsupported auth type=%d:%s", auth_type,
2019  bfd_auth_type_str (auth_type));
2020  return VNET_API_ERROR_BFD_NOTSUPP;
2021  }
2022  uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
2023  if (key_idx_p)
2024  {
2025  /* modifying existing key - must not be used */
2026  const uword key_idx = *key_idx_p;
2027  auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
2028  if (auth_key->use_count > 0)
2029  {
2030  vlib_log_err (bm->log_class,
2031  "authentication key with conf ID %u in use by %u BFD "
2032  "session(s) - cannot modify", conf_key_id,
2033  auth_key->use_count);
2034  return VNET_API_ERROR_BFD_EINUSE;
2035  }
2036  }
2037  else
2038  {
2039  /* adding new key */
2040  pool_get (bm->auth_keys, auth_key);
2041  auth_key->conf_key_id = conf_key_id;
2042  hash_set (bm->auth_key_by_conf_key_id, conf_key_id,
2043  auth_key - bm->auth_keys);
2044  }
2045  auth_key->auth_type = auth_type;
2046  memset (auth_key->key, 0, sizeof (auth_key->key));
2047  clib_memcpy (auth_key->key, key_data, key_len);
2048  return 0;
2049 #else
2050  vlib_log_err (bm->log_class,
2051  "SSL missing, cannot manipulate authentication keys");
2052  return VNET_API_ERROR_BFD_NOTSUPP;
2053 #endif
2054 }
2055 
2057 bfd_auth_del_key (u32 conf_key_id)
2058 {
2059 #if WITH_LIBSSL > 0
2060  bfd_auth_key_t *auth_key = NULL;
2061  bfd_main_t *bm = &bfd_main;
2062  uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
2063  if (key_idx_p)
2064  {
2065  /* deleting existing key - must not be used */
2066  const uword key_idx = *key_idx_p;
2067  auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
2068  if (auth_key->use_count > 0)
2069  {
2070  vlib_log_err (bm->log_class,
2071  "authentication key with conf ID %u in use by %u BFD "
2072  "session(s) - cannot delete", conf_key_id,
2073  auth_key->use_count);
2074  return VNET_API_ERROR_BFD_EINUSE;
2075  }
2076  hash_unset (bm->auth_key_by_conf_key_id, conf_key_id);
2077  memset (auth_key, 0, sizeof (*auth_key));
2078  pool_put (bm->auth_keys, auth_key);
2079  }
2080  else
2081  {
2082  /* no such key */
2083  vlib_log_err (bm->log_class,
2084  "authentication key with conf ID %u does not exist",
2085  conf_key_id);
2086  return VNET_API_ERROR_BFD_ENOENT;
2087  }
2088  return 0;
2089 #else
2090  vlib_log_err (bm->log_class,
2091  "SSL missing, cannot manipulate authentication keys");
2092  return VNET_API_ERROR_BFD_NOTSUPP;
2093 #endif
2094 }
2095 
2097 
2098 /*
2099  * fd.io coding-style-patch-verification: ON
2100  *
2101  * Local Variables:
2102  * eval: (c-set-style "gnu")
2103  * End:
2104  */
vlib_log_class_t vlib_log_register_class(char *class, char *subclass)
Definition: log.c:221
VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(bfd_hw_interface_up_down)
static u64 bfd_usec_to_clocks(const bfd_main_t *bm, u64 us)
Definition: bfd_main.c:54
static int bfd_transport_control_frame(vlib_main_t *vm, u32 bi, bfd_session_t *bs)
Definition: bfd_main.c:593
u8 bfd_pkt_get_auth_present(const bfd_pkt_t *pkt)
Definition: bfd_protocol.c:98
static void bfd_recalc_echo_tx_interval(bfd_main_t *bm, bfd_session_t *bs)
Definition: bfd_main.c:180
static void bfd_on_state_change(bfd_main_t *bm, bfd_session_t *bs, u64 now, int handling_wakeup)
Definition: bfd_main.c:512
bfd_session_t * bfd_get_session(bfd_main_t *bm, bfd_transport_e t)
Definition: bfd_main.c:1187
bfd_notify_fn_t * listeners
vector of callback notification functions
Definition: bfd_main.h:301
vnet_api_error_t
Definition: api_errno.h:147
#define hash_set(h, key, value)
Definition: hash.h:255
bfd_auth_type_e auth_type
authentication type for this key
Definition: bfd_main.h:54
void bfd_consume_pkt(bfd_main_t *bm, const bfd_pkt_t *pkt, u32 bs_idx)
Definition: bfd_main.c:1621
#define clib_min(x, y)
Definition: clib.h:289
u8 curr_bfd_key_id
current key ID sent out in bfd packet
Definition: bfd_main.h:219
#define CLIB_UNUSED(x)
Definition: clib.h:79
static uword random_default_seed(void)
Default random seed (unix/linux user-mode)
Definition: random.h:91
static void bfd_set_effective_required_min_rx(bfd_main_t *bm, bfd_session_t *bs, u64 required_min_rx_clocks)
Definition: bfd_main.c:350
static f64 vlib_process_wait_for_event_or_clock(vlib_main_t *vm, f64 dt)
Suspend a cooperative multi-tasking thread Waits for an event, or for the indicated number of seconds...
Definition: node_funcs.h:699
#define hash_unset(h, key)
Definition: hash.h:261
static uword * vlib_process_wait_for_event(vlib_main_t *vm)
Definition: node_funcs.h:619
void bfd_pkt_set_poll(bfd_pkt_t *pkt)
Definition: bfd_protocol.c:66
bfd_main_t bfd_main
Definition: bfd_main.c:2096
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
void bfd_on_timeout(vlib_main_t *vm, vlib_node_runtime_t *rt, bfd_main_t *bm, bfd_session_t *bs, u64 now)
Definition: bfd_main.c:957
#define BFD_ERR(...)
Definition: bfd_debug.h:75
unsigned long u64
Definition: types.h:89
u32 * auth_key_by_conf_key_id
hashmap - index in pool auth_keys by conf_key_id
Definition: bfd_main.h:298
static void bfd_session_switch_auth_to_next(bfd_session_t *bs)
Definition: bfd_main.c:1311
void timing_wheel_init(timing_wheel_t *w, u64 current_cpu_time, f64 cpu_clocks_per_second)
Definition: timing_wheel.c:21
u8 bfd_pkt_get_diag_code(const bfd_pkt_t *pkt)
Definition: bfd_protocol.c:35
static uword bfd_process(vlib_main_t *vm, vlib_node_runtime_t *rt, vlib_frame_t *f)
Definition: bfd_main.c:1002
bfd_session_t * bfd_find_session_by_disc(bfd_main_t *bm, u32 disc)
Definition: bfd_main.c:1244
u8 * format_bfd_auth_key(u8 *s, va_list *args)
Definition: bfd_main.c:68
u64 timing_wheel_next_expiring_elt_time(timing_wheel_t *w)
Definition: timing_wheel.c:342
#define NULL
Definition: clib.h:55
u64 echo_last_rx_clocks
timestamp of last echo packet received
Definition: bfd_main.h:180
f64 clocks_per_second
Definition: time.h:53
int bfd_verify_pkt_common(const bfd_pkt_t *pkt)
verify bfd packet - common checks
Definition: bfd_main.c:1262
static void bfd_set_state(bfd_main_t *bm, bfd_session_t *bs, bfd_state_e new_state, int handling_wakeup)
Definition: bfd_main.c:132
u32 echo_secret
secret used for calculating/checking checksum of echo packets
Definition: bfd_main.h:183
bfd_diag_code_e local_diag
local diagnostics
Definition: bfd_main.h:99
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:523
static u64 clib_cpu_time_now(void)
Definition: time.h:73
static u64 clib_xxhash(u64 key)
Definition: xxhash.h:58
static void bfd_on_config_change(vlib_main_t *vm, vlib_node_runtime_t *rt, bfd_main_t *bm, bfd_session_t *bs, u64 now)
Definition: bfd_main.c:560
void bfd_put_session(bfd_main_t *bm, bfd_session_t *bs)
Definition: bfd_main.c:1216
struct bfd_session_s::@50 auth
authentication information
u64 last_tx_clocks
timestamp of last packet transmitted
Definition: bfd_main.h:165
static u32 format_get_indent(u8 *s)
Definition: format.h:72
u8 remote_seq_number_known
set to 1 if remote sequence number is known
Definition: bfd_main.h:216
static void bfd_set_remote_required_min_rx(bfd_main_t *bm, bfd_session_t *bs, u64 now, u32 remote_required_min_rx_usec)
Definition: bfd_main.c:361
unsigned bfd_auth_type_supported(bfd_auth_type_e auth_type)
Definition: bfd_main.c:1836
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
clib_time_t clib_time
Definition: main.h:63
#define VNET_HW_INTERFACE_FLAG_LINK_UP
Definition: interface.h:458
bfd_diag_code_e
Definition: bfd_protocol.h:177
static void bfd_add_transport_layer(vlib_main_t *vm, u32 bi, bfd_session_t *bs)
Definition: bfd_main.c:577
void bfd_init_final_control_frame(vlib_main_t *vm, vlib_buffer_t *b, bfd_main_t *bm, bfd_session_t *bs, int is_local)
Definition: bfd_main.c:904
u32 bfd_process_node_index
background process node index
Definition: bfd_main.h:276
u8 bfd_pkt_get_version(const bfd_pkt_t *pkt)
Definition: bfd_protocol.c:22
u64 remote_min_echo_rx_clocks
remote min echo rx interval (clocks)
Definition: bfd_main.h:138
void timing_wheel_insert(timing_wheel_t *w, u64 insert_cpu_time, u32 user_data)
Definition: timing_wheel.c:294
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:228
u64 effective_required_min_rx_clocks
effective required min rx interval (clocks)
Definition: bfd_main.h:126
vlib_log_class_t log_class
log class
Definition: bfd_main.h:304
bfd_auth_type_e
Definition: bfd_protocol.h:36
unsigned char u8
Definition: types.h:56
u32 remote_seq_number
remote sequence number
Definition: bfd_main.h:213
int bfd_add_udp4_transport(vlib_main_t *vm, u32 bi, const bfd_session_t *bs, int is_echo)
Definition: bfd_udp.c:244
double f64
Definition: types.h:142
timing_wheel_t wheel
timing wheel for scheduling timeouts
Definition: bfd_main.h:267
vnet_api_error_t bfd_auth_deactivate(bfd_session_t *bs, u8 is_delayed)
Definition: bfd_main.c:1896
static int bfd_verify_pkt_auth_seq_num(bfd_session_t *bs, u32 received_seq_num, int is_meticulous)
Definition: bfd_main.c:1338
u64 effective_desired_min_tx_clocks
effective desired min tx interval (clocks)
Definition: bfd_main.h:117
u32 bfd_clocks_to_usec(const bfd_main_t *bm, u64 clocks)
Definition: bfd_main.c:60
u8 key[20]
key data directly usable for bfd purposes - already padded with zeroes (so we don&#39;t need the actual l...
Definition: bfd_main.h:51
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:104
const char * bfd_poll_state_string(bfd_poll_state_e state)
Definition: bfd_main.c:146
u32 random_seed
for generating random numbers
Definition: bfd_main.h:292
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:156
static uword vlib_process_get_events(vlib_main_t *vm, uword **data_vector)
Return the first event type which has occurred and a vector of per-event data of that type...
Definition: node_funcs.h:542
u8 * format_white_space(u8 *s, va_list *va)
Definition: std-formats.c:113
int bfd_transport_udp4(vlib_main_t *vm, u32 bi, const struct bfd_session_s *bs)
transport packet over udpv4
Definition: bfd_udp.c:412
u64 remote_min_rx_usec
remote min rx interval (microseconds)
Definition: bfd_main.h:129
u8 * format_hex_bytes(u8 *s, va_list *va)
Definition: std-formats.c:84
u64 tx_timeout_clocks
next time at which to transmit a packet
Definition: bfd_main.h:162
void bfd_event(bfd_main_t *bm, bfd_session_t *bs)
Definition: bfd_api.c:198
vhost_vring_state_t state
Definition: vhost_user.h:115
u64 config_required_min_rx_clocks
configured required min rx interval (clocks)
Definition: bfd_main.h:123
unsigned int u32
Definition: types.h:88
bfd_auth_key_t * next_key
set to next key to use if delayed switch is enabled - in that case the key is switched when first inc...
Definition: bfd_main.h:207
static vlib_node_registration_t bfd_process_node
(constructor) VLIB_REGISTER_NODE (bfd_process_node)
Definition: bfd_main.c:65
#define vlib_log_debug(...)
Definition: log.h:54
static void bfd_set_poll_state(bfd_session_t *bs, bfd_poll_state_e state)
Definition: bfd_main.c:160
static u32 vlib_get_buffer_index(vlib_main_t *vm, void *p)
Translate buffer pointer into buffer index.
Definition: buffer_funcs.h:141
static void bfd_calc_next_echo_tx(bfd_main_t *bm, bfd_session_t *bs, u64 now)
Definition: bfd_main.c:240
bfd_session_t * bfd_find_session_by_idx(bfd_main_t *bm, uword bs_idx)
Definition: bfd_main.c:1234
static u64 bfd_calc_echo_checksum(u32 discriminator, u64 expire_time, u32 secret)
Definition: bfd_main.c:40
u8 remote_demand
1 if remote system sets demand mode, 0 otherwise
Definition: bfd_main.h:147
bfd_session_t * sessions
pool of bfd sessions context data
Definition: bfd_main.h:264
bfd_poll_state_e
Definition: bfd_main.h:63
bfd_auth_key_t * auth_keys
pool of authentication keys
Definition: bfd_main.h:295
#define hash_get(h, key)
Definition: hash.h:249
bfd_transport_e transport
transport type for this session
Definition: bfd_main.h:232
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:464
static clib_error_t * bfd_sw_interface_up_down(vnet_main_t *vnm, u32 sw_if_index, u32 flags)
Definition: bfd_main.c:1122
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:108
static void vlib_process_signal_event(vlib_main_t *vm, uword node_index, uword type_opaque, uword data)
Definition: node_funcs.h:952
u32 remote_discr
remote discriminator
Definition: bfd_main.h:108
u64 default_desired_min_tx_clocks
default desired min tx in clocks
Definition: bfd_main.h:286
u64 echo_last_tx_clocks
timestamp of last echo packet transmitted
Definition: bfd_main.h:177
bfd_poll_state_e poll_state
state info regarding poll sequence
Definition: bfd_main.h:189
u8 bfd_pkt_get_control_plane_independent(const bfd_pkt_t *pkt)
Definition: bfd_protocol.c:84
unsigned short u16
Definition: types.h:57
signed long i64
Definition: types.h:82
f64 cpu_cps
cpu clocks per second
Definition: bfd_main.h:283
void bfd_pkt_set_auth_present(bfd_pkt_t *pkt)
Definition: bfd_protocol.c:104
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:202
BFD global declarations.
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:274
u64 echo_tx_timeout_clocks
next time at which to transmit echo packet
Definition: bfd_main.h:174
static void bfd_set_diag(bfd_session_t *bs, bfd_diag_code_e code)
Definition: bfd_main.c:121
u8 local_detect_mult
configured detect multiplier
Definition: bfd_main.h:144
static int bfd_is_echo_possible(bfd_session_t *bs)
Definition: bfd_main.c:715
u64 last_rx_clocks
timestamp of last packet received
Definition: bfd_main.h:168
int bfd_transport_udp6(vlib_main_t *vm, u32 bi, const struct bfd_session_s *bs)
transport packet over udpv6
Definition: bfd_udp.c:424
int bfd_add_udp6_transport(vlib_main_t *vm, u32 bi, const bfd_session_t *bs, int is_echo)
Definition: bfd_udp.c:299
u8 bfd_pkt_get_final(const bfd_pkt_t *pkt)
Definition: bfd_protocol.c:72
void bfd_pkt_set_final(bfd_pkt_t *pkt)
Definition: bfd_protocol.c:78
static void bfd_notify_listeners(bfd_main_t *bm, bfd_listen_event_e event, const bfd_session_t *bs)
Definition: bfd_main.c:393
bfd_diag_code_e remote_diag
remote diagnostics
Definition: bfd_main.h:102
static void bfd_send_periodic(vlib_main_t *vm, vlib_node_runtime_t *rt, bfd_main_t *bm, bfd_session_t *bs, u64 now)
Definition: bfd_main.c:823
u32 flags
Definition: vhost_user.h:110
#define BFD_DEFAULT_DESIRED_MIN_TX_USEC
default, slow transmission interval for BFD packets, per spec at least 1s
Definition: bfd_main.h:384
void bfd_session_start(bfd_main_t *bm, bfd_session_t *bs)
Definition: bfd_main.c:404
const char * bfd_auth_type_str(bfd_auth_type_e auth_type)
Definition: bfd_protocol.c:151
u64 transmit_interval_clocks
transmit interval
Definition: bfd_main.h:159
vnet_main_t * vnet_main
Definition: bfd_main.h:280
u8 bfd_pkt_get_multipoint(const bfd_pkt_t *pkt)
Definition: bfd_protocol.c:124
static void bfd_set_effective_desired_min_tx(bfd_main_t *bm, bfd_session_t *bs, u64 now, u64 desired_min_tx_clocks)
Definition: bfd_main.c:336
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:153
vlib_main_t * vm
Definition: buffer.c:294
static void bfd_recalc_tx_interval(bfd_main_t *bm, bfd_session_t *bs)
Definition: bfd_main.c:171
BFD protocol declarations.
bfd_input_next_t
Definition: bfd_main.c:89
u32 config_desired_min_tx_usec
configured desired min tx interval (microseconds)
Definition: bfd_main.h:111
u32 bfd_max_key_len_for_auth_type(bfd_auth_type_e auth_type)
get the maximum length of key data for given auth type
Definition: bfd_protocol.c:138
static void bfd_calc_next_tx(bfd_main_t *bm, bfd_session_t *bs, u64 now)
Definition: bfd_main.c:190
u8 * format_bfd_session(u8 *s, va_list *args)
Definition: bfd_main.c:1789
#define clib_memcpy(a, b, c)
Definition: string.h:75
u32 * timing_wheel_advance(timing_wheel_t *w, u64 advance_cpu_time, u32 *expired_user_data, u64 *next_expiring_element_cpu_time)
Definition: timing_wheel.c:592
const char * bfd_diag_code_string(bfd_diag_code_e diag)
Definition: bfd_protocol.c:164
static void bfd_add_auth_section(vlib_buffer_t *b, bfd_session_t *bs)
Definition: bfd_main.c:676
static int bfd_verify_pkt_auth_key_sha1(const bfd_pkt_t *pkt, u32 pkt_size, bfd_session_t *bs, u8 bfd_key_id, bfd_auth_key_t *auth_key)
Definition: bfd_main.c:1406
u8 bfd_pkt_get_demand(const bfd_pkt_t *pkt)
Definition: bfd_protocol.c:110
vnet_api_error_t bfd_auth_activate(bfd_session_t *bs, u32 conf_key_id, u8 bfd_key_id, u8 is_delayed)
Definition: bfd_main.c:1847
BFD global declarations.
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:271
static void bfd_set_remote_required_min_echo_rx(bfd_main_t *bm, bfd_session_t *bs, u64 now, u32 remote_required_min_echo_rx_usec)
Definition: bfd_main.c:377
u64 poll_state_start_or_timeout_clocks
helper for delayed poll sequence - marks either start of running poll sequence or timeout...
Definition: bfd_main.h:195
bfd_state_e
Definition: bfd_protocol.h:195
u64 detection_time_clocks
detection time
Definition: bfd_main.h:186
u8 * bfd_input_format_trace(u8 *s, va_list *args)
Definition: bfd_main.c:445
#define BFD_DBG(...)
Definition: bfd_debug.h:74
void bfd_pkt_set_version(bfd_pkt_t *pkt, int version)
Definition: bfd_protocol.c:28
#define VNET_SW_INTERFACE_FLAG_ADMIN_UP
Definition: interface.h:661
#define ASSERT(truth)
static void bfd_recalc_detection_time(bfd_main_t *bm, bfd_session_t *bs)
Definition: bfd_main.c:261
u64 config_desired_min_tx_clocks
configured desired min tx interval (clocks)
Definition: bfd_main.h:114
u32 vlib_log_get_indent()
Definition: log.c:269
long ctx[MAX_CONNS]
Definition: main.c:126
int bfd_udp_is_echo_available(bfd_transport_e transport)
check if the bfd udp layer is echo-capable at this time
Definition: bfd_udp.c:96
u8 echo
1 is echo function is active, 0 otherwise
Definition: bfd_main.h:153
u64 wheel_time_clocks
set to value of timer in timing wheel, 0 if never set
Definition: bfd_main.h:156
u64 remote_desired_min_tx_clocks
remote desired min tx interval (clocks)
Definition: bfd_main.h:141
u8 bfd_pkt_get_state(const bfd_pkt_t *pkt)
Definition: bfd_protocol.c:48
u32 local_discr
local discriminator
Definition: bfd_main.h:105
static f64 random_f64(u32 *seed)
Generate f64 random number in the interval [0,1].
Definition: random.h:145
bfd_hop_type_e hop_type
BFD hop type.
Definition: bfd_main.h:96
u32 conf_key_id
global configuration key ID
Definition: bfd_main.h:42
vnet_api_error_t bfd_auth_del_key(u32 conf_key_id)
delete existing authentication key
Definition: bfd_main.c:2057
vlib_main_t * vlib_main
convenience variables
Definition: bfd_main.h:279
bfd_state_e local_state
session state
Definition: bfd_main.h:90
static int bfd_echo_add_transport_layer(vlib_main_t *vm, u32 bi, bfd_session_t *bs)
Definition: bfd_main.c:610
#define clib_max(x, y)
Definition: clib.h:282
u32 * session_by_disc
hashmap - bfd session by discriminator
Definition: bfd_main.h:273
int bfd_consume_echo_pkt(bfd_main_t *bm, vlib_buffer_t *b)
Definition: bfd_main.c:1753
vnet_api_error_t bfd_session_set_params(bfd_main_t *bm, bfd_session_t *bs, u32 desired_min_tx_usec, u32 required_min_rx_usec, u8 detect_mult)
Definition: bfd_main.c:1938
void(* bfd_notify_fn_t)(bfd_listen_event_e, const bfd_session_t *)
session nitification call back function type
Definition: bfd_main.h:259
struct _vlib_node_registration vlib_node_registration_t
u64 echo_transmit_interval_clocks
transmit interval for echo packets
Definition: bfd_main.h:171
u32 local_seq_number
sequence number incremented occasionally or always (if meticulous)
Definition: bfd_main.h:210
void bfd_register_listener(bfd_notify_fn_t fn)
Register a callback function to receive session notifications.
Definition: bfd_main.c:1149
u32 config_required_min_rx_usec
configured required min rx interval (microseconds)
Definition: bfd_main.h:120
static void bfd_set_timer(bfd_main_t *bm, bfd_session_t *bs, u64 now, int handling_wakeup)
Definition: bfd_main.c:276
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
static void bfd_set_defaults(bfd_main_t *bm, bfd_session_t *bs)
Definition: bfd_main.c:99
u32 use_count
keeps track of how many sessions reference this key
Definition: bfd_main.h:45
#define VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b)
Definition: buffer.h:546
#define vlib_log_info(...)
Definition: log.h:53
u64 uword
Definition: types.h:112
u8 next_bfd_key_id
key ID to use when switched to next_key
Definition: bfd_main.h:222
static int bfd_verify_pkt_auth_key(const bfd_pkt_t *pkt, u32 pkt_size, bfd_session_t *bs, u8 bfd_key_id, bfd_auth_key_t *auth_key)
Definition: bfd_main.c:1482
#define vlib_log_crit(...)
Definition: log.h:49
#define F(x)
u8 bfd_pkt_get_poll(const bfd_pkt_t *pkt)
Definition: bfd_protocol.c:60
Linear Congruential Random Number Generator.
u32 bs_idx
index in bfd_main.sessions pool
Definition: bfd_main.h:87
u8 * format_bfd_session_brief(u8 *s, va_list *args)
Definition: bfd_main.c:1825
static int bfd_transport_echo(vlib_main_t *vm, u32 bi, bfd_session_t *bs)
Definition: bfd_main.c:627
#define vnet_buffer(b)
Definition: buffer.h:360
static u32 random_u32(u32 *seed)
32-bit random number generator
Definition: random.h:69
u64 remote_min_echo_rx_usec
remote min echo rx interval (microseconds)
Definition: bfd_main.h:135
vnet_api_error_t bfd_auth_set_key(u32 conf_key_id, u8 auth_type, u8 key_len, const u8 *key_data)
create or modify bfd authentication key
Definition: bfd_main.c:2001
#define STRUCT_SIZE_OF(t, f)
Definition: clib.h:64
#define vec_foreach(var, vec)
Vector iterator.
bfd_state_e remote_state
remote session state
Definition: bfd_main.h:93
const char * bfd_state_string(bfd_state_e state)
Definition: bfd_protocol.c:177
#define vlib_log_err(...)
Definition: log.h:50
bfd packet trace capture
Definition: bfd_main.h:324
u64 min_required_min_rx_while_echo_clocks
minimum required min rx while echo function is active - clocks
Definition: bfd_main.h:289
int bfd_verify_pkt_auth(const bfd_pkt_t *pkt, u16 pkt_size, bfd_session_t *bs)
verify bfd packet - authentication
Definition: bfd_main.c:1543
static void vlib_buffer_free_one(vlib_main_t *vm, u32 buffer_index)
Free one buffer Shorthand to free a single buffer chain.
Definition: buffer_funcs.h:575
#define USEC_PER_SECOND
Definition: bfd_main.h:381
static int bfd_auth_type_is_meticulous(bfd_auth_type_e auth_type)
Definition: bfd_main.c:1327
bfd_auth_key_t * curr_key
current key in use
Definition: bfd_main.h:201
static u32 vlib_buffer_alloc(vlib_main_t *vm, u32 *buffers, u32 n_buffers)
Allocate buffers into supplied array.
Definition: buffer_funcs.h:490
static void bfd_send_echo(vlib_main_t *vm, vlib_node_runtime_t *rt, bfd_main_t *bm, bfd_session_t *bs, u64 now)
Definition: bfd_main.c:763
void bfd_pkt_set_state(bfd_pkt_t *pkt, int value)
Definition: bfd_protocol.c:54
static clib_error_t * bfd_hw_interface_up_down(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Definition: bfd_main.c:1136
u8 remote_detect_mult
remote detect multiplier
Definition: bfd_main.h:150
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:57
void bfd_pkt_set_diag_code(bfd_pkt_t *pkt, int value)
Definition: bfd_protocol.c:41
#define BFD_REQUIRED_MIN_RX_USEC_WHILE_ECHO
minimum required min rx set locally when echo function is used, per spec should be set to at least 1s...
Definition: bfd_main.h:390
u64 remote_min_rx_clocks
remote min rx interval (clocks)
Definition: bfd_main.h:132
u8 is_delayed
set to 1 if delayed action is pending, which might be activation of authentication, change of key or deactivation
Definition: bfd_main.h:228
static clib_error_t * bfd_main_init(vlib_main_t *vm)
Definition: bfd_main.c:1160
bfd_transport_e
Definition: bfd_api.h:30
bfd_listen_event_e
Definition: bfd_main.h:249
u64 wheel_inaccuracy
timing wheel inaccuracy, in clocks
Definition: bfd_main.h:270
static void bfd_init_control_frame(bfd_main_t *bm, bfd_session_t *bs, vlib_buffer_t *b)
Definition: bfd_main.c:732
VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(bfd_sw_interface_up_down)
void bfd_session_set_flags(bfd_session_t *bs, u8 admin_up_down)
Definition: bfd_main.c:418
static void bfd_check_rx_timeout(bfd_main_t *bm, bfd_session_t *bs, u64 now, int handling_wakeup)
Definition: bfd_main.c:923