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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 * @brief BFD nodes implementation
20 #include <vlibmemory/api.h>
21 #include <vppinfra/random.h>
22 #include <vppinfra/error.h>
23 #include <vppinfra/hash.h>
24 #include <vppinfra/xxhash.h>
25 #include <vnet/ethernet/ethernet.h>
26 #include <vnet/ethernet/packet.h>
27 #include <vnet/bfd/bfd_debug.h>
28 #include <vnet/bfd/bfd_protocol.h>
29 #include <vnet/bfd/bfd_main.h>
31 #include <vnet/crypto/crypto.h>
34 bfd_validate_counters (bfd_main_t *bm)
36 vlib_validate_combined_counter (&bm->rx_counter, pool_elts (bm->sessions));
37 vlib_validate_combined_counter (&bm->rx_echo_counter,
38 pool_elts (bm->sessions));
39 vlib_validate_combined_counter (&bm->tx_counter, pool_elts (bm->sessions));
40 vlib_validate_combined_counter (&bm->tx_echo_counter,
41 pool_elts (bm->sessions));
45 bfd_calc_echo_checksum (u32 discriminator, u64 expire_time, u32 secret)
48 #if defined(clib_crc32c_uses_intrinsics) && !defined (__i386__)
49 checksum = clib_crc32c_u64 (0, discriminator);
50 checksum = clib_crc32c_u64 (checksum, expire_time);
51 checksum = clib_crc32c_u64 (checksum, secret);
53 checksum = clib_xxhash (discriminator ^ expire_time ^ secret);
59 bfd_usec_to_nsec (u64 us)
61 return us * NSEC_PER_USEC;
65 bfd_nsec_to_usec (u64 nsec)
67 return nsec / NSEC_PER_USEC;
71 bfd_time_now_nsec (vlib_main_t * vm, f64 * vm_time)
73 f64 _vm_time = vlib_time_now (vm);
76 return _vm_time * NSEC_PER_SEC;
79 static vlib_node_registration_t bfd_process_node;
82 format_bfd_auth_key (u8 * s, va_list * args)
84 const bfd_auth_key_t *key = va_arg (*args, bfd_auth_key_t *);
87 s = format (s, "{auth-type=%u:%s, conf-key-id=%u, use-count=%u}, ",
88 key->auth_type, bfd_auth_type_str (key->auth_type),
89 key->conf_key_id, key->use_count);
93 s = format (s, "{none}");
99 * We actually send all bfd pkts to the "error" node after scanning
100 * them, so the graph node has only one next-index. The "error-drop"
101 * node automatically bumps our per-node packet counters for us.
105 BFD_INPUT_NEXT_NORMAL,
109 static void bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now,
110 int handling_wakeup);
113 bfd_set_defaults (bfd_main_t * bm, bfd_session_t * bs)
115 bs->local_state = BFD_STATE_down;
116 bs->local_diag = BFD_DIAG_CODE_no_diag;
117 bs->remote_state = BFD_STATE_down;
118 bs->remote_discr = 0;
119 bs->hop_type = BFD_HOP_TYPE_SINGLE;
120 bs->config_desired_min_tx_usec = BFD_DEFAULT_DESIRED_MIN_TX_USEC;
121 bs->config_desired_min_tx_nsec = bm->default_desired_min_tx_nsec;
122 bs->effective_desired_min_tx_nsec = bm->default_desired_min_tx_nsec;
123 bs->remote_min_rx_usec = 1;
124 bs->remote_min_rx_nsec = bfd_usec_to_nsec (bs->remote_min_rx_usec);
125 bs->remote_min_echo_rx_usec = 0;
126 bs->remote_min_echo_rx_nsec = 0;
127 bs->remote_demand = 0;
128 bs->auth.remote_seq_number = 0;
129 bs->auth.remote_seq_number_known = 0;
130 bs->auth.local_seq_number = random_u32 (&bm->random_seed);
131 bs->echo_secret = random_u32 (&bm->random_seed);
135 bfd_set_diag (bfd_session_t * bs, bfd_diag_code_e code)
137 if (bs->local_diag != code)
139 BFD_DBG ("set local_diag, bs_idx=%d: '%d:%s'", bs->bs_idx, code,
140 bfd_diag_code_string (code));
141 bs->local_diag = code;
146 bfd_set_state (vlib_main_t * vm, bfd_main_t * bm, bfd_session_t * bs,
147 bfd_state_e new_state, int handling_wakeup)
149 if (bs->local_state != new_state)
151 BFD_DBG ("Change state, bs_idx=%d: %s->%s", bs->bs_idx,
152 bfd_state_string (bs->local_state),
153 bfd_state_string (new_state));
154 bs->local_state = new_state;
155 bfd_on_state_change (bm, bs, bfd_time_now_nsec (vm, NULL),
161 bfd_poll_state_string (bfd_poll_state_e state)
167 return "BFD_POLL_" #x;
168 foreach_bfd_poll_state (F)
175 bfd_set_poll_state (bfd_session_t * bs, bfd_poll_state_e state)
177 if (bs->poll_state != state)
179 BFD_DBG ("Setting poll state=%s, bs_idx=%u",
180 bfd_poll_state_string (state), bs->bs_idx);
181 bs->poll_state = state;
186 bfd_recalc_tx_interval (bfd_session_t *bs)
188 bs->transmit_interval_nsec =
189 clib_max (bs->effective_desired_min_tx_nsec, bs->remote_min_rx_nsec);
190 BFD_DBG ("Recalculated transmit interval " BFD_CLK_FMT,
191 BFD_CLK_PRN (bs->transmit_interval_nsec));
195 bfd_recalc_echo_tx_interval (bfd_session_t *bs)
197 bs->echo_transmit_interval_nsec =
198 clib_max (bs->effective_desired_min_tx_nsec, bs->remote_min_echo_rx_nsec);
199 BFD_DBG ("Recalculated echo transmit interval " BFD_CLK_FMT,
200 BFD_CLK_PRN (bs->echo_transmit_interval_nsec));
204 bfd_calc_next_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now)
206 if (bs->local_detect_mult > 1)
208 /* common case - 75-100% of transmit interval */
209 bs->tx_timeout_nsec = bs->last_tx_nsec +
210 (1 - .25 * (random_f64 (&bm->random_seed))) *
211 bs->transmit_interval_nsec;
212 if (bs->tx_timeout_nsec < now)
215 * the timeout is in the past, which means that either remote
216 * demand mode was set or performance/clock issues ...
218 BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
219 "tx_timeout is %lu)",
220 (now - bs->tx_timeout_nsec) /
221 bs->transmit_interval_nsec, now, bs->tx_timeout_nsec);
222 bs->tx_timeout_nsec = now;
227 /* special case - 75-90% of transmit interval */
228 bs->tx_timeout_nsec = bs->last_tx_nsec +
229 (.9 - .15 * (random_f64 (&bm->random_seed))) *
230 bs->transmit_interval_nsec;
231 if (bs->tx_timeout_nsec < now)
234 * the timeout is in the past, which means that either remote
235 * demand mode was set or performance/clock issues ...
237 BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
238 "tx_timeout is %lu)",
239 (now - bs->tx_timeout_nsec) /
240 bs->transmit_interval_nsec, now, bs->tx_timeout_nsec);
241 bs->tx_timeout_nsec = now;
244 if (bs->tx_timeout_nsec)
246 BFD_DBG ("Next transmit in %lu nsec/%.02fs@%lu",
247 bs->tx_timeout_nsec - now,
248 (bs->tx_timeout_nsec - now) * SEC_PER_NSEC,
249 bs->tx_timeout_nsec);
254 bfd_calc_next_echo_tx (bfd_session_t *bs, u64 now)
256 bs->echo_tx_timeout_nsec =
257 bs->echo_last_tx_nsec + bs->echo_transmit_interval_nsec;
258 if (bs->echo_tx_timeout_nsec < now)
260 /* huh, we've missed it already, transmit now */
261 BFD_DBG ("Missed %lu echo transmit events (now is %lu, calc tx_timeout "
263 (now - bs->echo_tx_timeout_nsec) /
264 bs->echo_transmit_interval_nsec,
265 now, bs->echo_tx_timeout_nsec);
266 bs->echo_tx_timeout_nsec = now;
268 BFD_DBG ("Next echo transmit in %lu nsec/%.02fs@%lu",
269 bs->echo_tx_timeout_nsec - now,
270 (bs->echo_tx_timeout_nsec - now) * SEC_PER_NSEC,
271 bs->echo_tx_timeout_nsec);
275 bfd_recalc_detection_time (bfd_session_t *bs)
277 if (bs->local_state == BFD_STATE_init || bs->local_state == BFD_STATE_up)
279 bs->detection_time_nsec =
280 bs->remote_detect_mult *
281 clib_max (bs->effective_required_min_rx_nsec,
282 bs->remote_desired_min_tx_nsec);
283 BFD_DBG ("Recalculated detection time %lu nsec/%.3fs",
284 bs->detection_time_nsec,
285 bs->detection_time_nsec * SEC_PER_NSEC);
290 bfd_set_timer (bfd_main_t * bm, bfd_session_t * bs, u64 now,
296 if (BFD_STATE_up == bs->local_state)
298 rx_timeout = bs->last_rx_nsec + bs->detection_time_nsec;
300 if (BFD_STATE_up != bs->local_state ||
301 (!bs->remote_demand && bs->remote_min_rx_usec) ||
302 BFD_POLL_NOT_NEEDED != bs->poll_state)
304 tx_timeout = bs->tx_timeout_nsec;
306 if (tx_timeout && rx_timeout)
308 next = clib_min (tx_timeout, rx_timeout);
318 if (bs->echo && next > bs->echo_tx_timeout_nsec)
320 next = bs->echo_tx_timeout_nsec;
322 BFD_DBG ("bs_idx=%u, tx_timeout=%lu, echo_tx_timeout=%lu, rx_timeout=%lu, "
324 bs->bs_idx, tx_timeout, bs->echo_tx_timeout_nsec, rx_timeout,
326 ? "tx" : (next == bs->echo_tx_timeout_nsec ? "echo tx" : "rx"));
330 bs->event_time_nsec = next;
331 /* add extra tick if it's not even */
332 u32 wheel_time_ticks =
333 (bs->event_time_nsec - now) / bm->nsec_per_tw_tick +
334 ((bs->event_time_nsec - now) % bm->nsec_per_tw_tick != 0);
335 BFD_DBG ("event_time_nsec %lu (%lu nsec/%.3fs in future) -> "
336 "wheel_time_ticks %u", bs->event_time_nsec,
337 bs->event_time_nsec - now,
338 (bs->event_time_nsec - now) * SEC_PER_NSEC, wheel_time_ticks);
339 wheel_time_ticks = wheel_time_ticks ? wheel_time_ticks : 1;
343 TW (tw_timer_update) (&bm->wheel, bs->tw_id, wheel_time_ticks);
344 BFD_DBG ("tw_timer_update(%p, %u, %lu);", &bm->wheel, bs->tw_id,
350 TW (tw_timer_start) (&bm->wheel, bs->bs_idx, 0, wheel_time_ticks);
351 BFD_DBG ("tw_timer_start(%p, %u, 0, %lu) == %u;", &bm->wheel,
352 bs->bs_idx, wheel_time_ticks);
355 if (!handling_wakeup)
358 /* Send only if it is earlier than current awaited wakeup time */
360 (bs->event_time_nsec < bm->bfd_process_next_wakeup_nsec) &&
362 * If the wake-up time is within 2x the delay of the event propagation delay,
363 * avoid the expense of sending the event. The 2x multiplier is to workaround the race whereby
364 * simultaneous event + expired timer create one recurring bogus wakeup/suspend instance,
365 * due to double scheduling of the node on the pending list.
367 (bm->bfd_process_next_wakeup_nsec - bs->event_time_nsec >
368 2 * bm->bfd_process_wakeup_event_delay_nsec) &&
369 /* Must be no events in flight to send an event */
370 (!bm->bfd_process_wakeup_events_in_flight);
372 /* If we do send the signal, note this down along with the start timestamp */
375 bm->bfd_process_wakeup_events_in_flight++;
376 bm->bfd_process_wakeup_event_start_nsec = now;
381 /* Use the multithreaded event sending so the workers can send events too */
384 vlib_process_signal_event_mt (bm->vlib_main,
385 bm->bfd_process_node_index,
386 BFD_EVENT_RESCHEDULE, ~0);
392 bfd_set_effective_desired_min_tx (bfd_main_t * bm,
393 bfd_session_t * bs, u64 now,
394 u64 desired_min_tx_nsec)
396 bs->effective_desired_min_tx_nsec = desired_min_tx_nsec;
397 BFD_DBG ("Set effective desired min tx to " BFD_CLK_FMT,
398 BFD_CLK_PRN (bs->effective_desired_min_tx_nsec));
399 bfd_recalc_detection_time (bs);
400 bfd_recalc_tx_interval (bs);
401 bfd_recalc_echo_tx_interval (bs);
402 bfd_calc_next_tx (bm, bs, now);
406 bfd_set_effective_required_min_rx (bfd_session_t *bs, u64 required_min_rx_nsec)
408 bs->effective_required_min_rx_nsec = required_min_rx_nsec;
409 BFD_DBG ("Set effective required min rx to " BFD_CLK_FMT,
410 BFD_CLK_PRN (bs->effective_required_min_rx_nsec));
411 bfd_recalc_detection_time (bs);
415 bfd_set_remote_required_min_rx (bfd_session_t *bs,
416 u32 remote_required_min_rx_usec)
418 if (bs->remote_min_rx_usec != remote_required_min_rx_usec)
420 bs->remote_min_rx_usec = remote_required_min_rx_usec;
421 bs->remote_min_rx_nsec = bfd_usec_to_nsec (remote_required_min_rx_usec);
422 BFD_DBG ("Set remote min rx to " BFD_CLK_FMT,
423 BFD_CLK_PRN (bs->remote_min_rx_nsec));
424 bfd_recalc_detection_time (bs);
425 bfd_recalc_tx_interval (bs);
430 bfd_set_remote_required_min_echo_rx (bfd_session_t *bs,
431 u32 remote_required_min_echo_rx_usec)
433 if (bs->remote_min_echo_rx_usec != remote_required_min_echo_rx_usec)
435 bs->remote_min_echo_rx_usec = remote_required_min_echo_rx_usec;
436 bs->remote_min_echo_rx_nsec =
437 bfd_usec_to_nsec (bs->remote_min_echo_rx_usec);
438 BFD_DBG ("Set remote min echo rx to " BFD_CLK_FMT,
439 BFD_CLK_PRN (bs->remote_min_echo_rx_nsec));
440 bfd_recalc_echo_tx_interval (bs);
445 bfd_notify_listeners (bfd_main_t * bm,
446 bfd_listen_event_e event, const bfd_session_t * bs)
449 vec_foreach (fn, bm->listeners)
456 bfd_session_start (bfd_main_t * bm, bfd_session_t * bs)
458 BFD_DBG ("\nStarting session: %U", format_bfd_session, bs);
459 vlib_log_info (bm->log_class, "start BFD session: %U",
460 format_bfd_session_brief, bs);
461 bfd_set_effective_required_min_rx (bs, bs->config_required_min_rx_nsec);
462 bfd_recalc_tx_interval (bs);
463 vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index,
464 BFD_EVENT_NEW_SESSION, bs->bs_idx);
465 bfd_notify_listeners (bm, BFD_LISTEN_EVENT_CREATE, bs);
469 bfd_session_stop (bfd_main_t *bm, bfd_session_t *bs)
471 BFD_DBG ("\nStopping session: %U", format_bfd_session, bs);
472 bfd_notify_listeners (bm, BFD_LISTEN_EVENT_DELETE, bs);
476 bfd_session_set_flags (vlib_main_t * vm, bfd_session_t * bs, u8 admin_up_down)
478 bfd_main_t *bm = &bfd_main;
479 u64 now = bfd_time_now_nsec (vm, NULL);
482 BFD_DBG ("Session set admin-up, bs-idx=%u", bs->bs_idx);
483 vlib_log_info (bm->log_class, "set session admin-up: %U",
484 format_bfd_session_brief, bs);
485 bfd_set_state (vm, bm, bs, BFD_STATE_down, 0);
486 bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
487 bfd_calc_next_tx (bm, bs, now);
488 bfd_set_timer (bm, bs, now, 0);
492 BFD_DBG ("Session set admin-down, bs-idx=%u", bs->bs_idx);
493 vlib_log_info (bm->log_class, "set session admin-down: %U",
494 format_bfd_session_brief, bs);
495 bfd_set_diag (bs, BFD_DIAG_CODE_admin_down);
496 bfd_set_state (vm, bm, bs, BFD_STATE_admin_down, 0);
497 bfd_calc_next_tx (bm, bs, now);
498 bfd_set_timer (bm, bs, now, 0);
503 format_bfd_pkt (u8 *s, va_list *args)
505 u32 len = va_arg (*args, u32);
506 u8 *data = va_arg (*args, u8 *);
508 const bfd_pkt_t *pkt = (bfd_pkt_t *) data;
509 if (len > STRUCT_SIZE_OF (bfd_pkt_t, head))
513 "BFD v%u, diag=%u(%s), state=%u(%s),\n"
514 " flags=(P:%u, F:%u, C:%u, A:%u, D:%u, M:%u), "
515 "detect_mult=%u, length=%u",
516 bfd_pkt_get_version (pkt), bfd_pkt_get_diag_code (pkt),
517 bfd_diag_code_string (bfd_pkt_get_diag_code (pkt)),
518 bfd_pkt_get_state (pkt), bfd_state_string (bfd_pkt_get_state (pkt)),
519 bfd_pkt_get_poll (pkt), bfd_pkt_get_final (pkt),
520 bfd_pkt_get_control_plane_independent (pkt),
521 bfd_pkt_get_auth_present (pkt), bfd_pkt_get_demand (pkt),
522 bfd_pkt_get_multipoint (pkt), pkt->head.detect_mult, pkt->head.length);
523 if (len >= sizeof (bfd_pkt_t) && pkt->head.length >= sizeof (bfd_pkt_t))
525 s = format (s, "\n my discriminator: %u\n",
526 clib_net_to_host_u32 (pkt->my_disc));
527 s = format (s, " your discriminator: %u\n",
528 clib_net_to_host_u32 (pkt->your_disc));
529 s = format (s, " desired min tx interval: %u\n",
530 clib_net_to_host_u32 (pkt->des_min_tx));
531 s = format (s, " required min rx interval: %u\n",
532 clib_net_to_host_u32 (pkt->req_min_rx));
533 s = format (s, " required min echo rx interval: %u",
534 clib_net_to_host_u32 (pkt->req_min_echo_rx));
536 if (len >= sizeof (bfd_pkt_with_common_auth_t) &&
537 pkt->head.length >= sizeof (bfd_pkt_with_common_auth_t) &&
538 bfd_pkt_get_auth_present (pkt))
540 const bfd_pkt_with_common_auth_t *with_auth = (void *) pkt;
541 const bfd_auth_common_t *common = &with_auth->common_auth;
542 s = format (s, "\n auth len: %u\n", common->len);
543 s = format (s, " auth type: %u:%s", common->type,
544 bfd_auth_type_str (common->type));
545 if (len >= sizeof (bfd_pkt_with_sha1_auth_t) &&
546 pkt->head.length >= sizeof (bfd_pkt_with_sha1_auth_t) &&
547 (BFD_AUTH_TYPE_keyed_sha1 == common->type ||
548 BFD_AUTH_TYPE_meticulous_keyed_sha1 == common->type))
550 const bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt;
551 const bfd_auth_sha1_t *sha1 = &with_sha1->sha1_auth;
552 s = format (s, " seq num: %u\n",
553 clib_net_to_host_u32 (sha1->seq_num));
554 s = format (s, " key id: %u\n", sha1->key_id);
555 s = format (s, " hash: %U", format_hex_bytes, sha1->hash,
556 sizeof (sha1->hash));
565 bfd_input_format_trace (u8 *s, va_list *args)
567 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
568 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
569 const bfd_input_trace_t *t = va_arg (*args, bfd_input_trace_t *);
571 s = format (s, "%U", format_bfd_pkt, t->len, t->data);
582 bfd_rpc_event_cb (const bfd_rpc_event_t * a)
584 bfd_main_t *bm = &bfd_main;
585 u32 bs_idx = a->bs_idx;
587 bfd_session_t session_data;
590 if (!pool_is_free_index (bm->sessions, bs_idx))
592 bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
593 clib_memcpy (&session_data, bs, sizeof (bfd_session_t));
598 BFD_DBG ("Ignoring event RPC for non-existent session index %u",
604 bfd_event (bm, &session_data);
608 bfd_event_rpc (u32 bs_idx)
610 const u32 data_size = sizeof (bfd_rpc_event_t);
612 bfd_rpc_event_t *event = (bfd_rpc_event_t *) data;
614 event->bs_idx = bs_idx;
615 vl_api_rpc_call_main_thread (bfd_rpc_event_cb, data, data_size);
621 } bfd_rpc_notify_listeners_t;
624 bfd_rpc_notify_listeners_cb (const bfd_rpc_notify_listeners_t * a)
626 bfd_main_t *bm = &bfd_main;
627 u32 bs_idx = a->bs_idx;
629 if (!pool_is_free_index (bm->sessions, bs_idx))
631 bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
632 bfd_notify_listeners (bm, BFD_LISTEN_EVENT_UPDATE, bs);
636 BFD_DBG ("Ignoring notify RPC for non-existent session index %u",
643 bfd_notify_listeners_rpc (u32 bs_idx)
645 const u32 data_size = sizeof (bfd_rpc_notify_listeners_t);
647 bfd_rpc_notify_listeners_t *notify = (bfd_rpc_notify_listeners_t *) data;
648 notify->bs_idx = bs_idx;
649 vl_api_rpc_call_main_thread (bfd_rpc_notify_listeners_cb, data, data_size);
653 bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now,
656 BFD_DBG ("\nState changed: %U", format_bfd_session, bs);
658 if (vlib_get_thread_index () == 0)
664 /* without RPC - a REGRESSION: BFD event are not propagated */
665 bfd_event_rpc (bs->bs_idx);
668 switch (bs->local_state)
670 case BFD_STATE_admin_down:
672 bfd_set_effective_desired_min_tx (bm, bs, now,
674 (bs->config_desired_min_tx_nsec,
675 bm->default_desired_min_tx_nsec));
676 bfd_set_effective_required_min_rx (bs, bs->config_required_min_rx_nsec);
677 bfd_set_timer (bm, bs, now, handling_wakeup);
681 bfd_set_effective_desired_min_tx (bm, bs, now,
683 (bs->config_desired_min_tx_nsec,
684 bm->default_desired_min_tx_nsec));
685 bfd_set_effective_required_min_rx (bs, bs->config_required_min_rx_nsec);
686 bfd_set_timer (bm, bs, now, handling_wakeup);
690 bfd_set_effective_desired_min_tx (bm, bs, now,
691 bs->config_desired_min_tx_nsec);
692 bfd_set_timer (bm, bs, now, handling_wakeup);
695 bfd_set_effective_desired_min_tx (bm, bs, now,
696 bs->config_desired_min_tx_nsec);
697 if (BFD_POLL_NOT_NEEDED == bs->poll_state)
699 bfd_set_effective_required_min_rx (bs,
700 bs->config_required_min_rx_nsec);
702 bfd_set_timer (bm, bs, now, handling_wakeup);
705 if (vlib_get_thread_index () == 0)
707 bfd_notify_listeners (bm, BFD_LISTEN_EVENT_UPDATE, bs);
711 /* without RPC - a REGRESSION: state changes are not propagated */
712 bfd_notify_listeners_rpc (bs->bs_idx);
717 bfd_on_config_change (bfd_main_t *bm, bfd_session_t *bs, u64 now)
720 * if remote demand mode is set and we need to do a poll, set the next
721 * timeout so that the session wakes up immediately
723 if (bs->remote_demand && BFD_POLL_NEEDED == bs->poll_state &&
724 bs->poll_state_start_or_timeout_nsec < now)
726 bs->tx_timeout_nsec = now;
728 bfd_recalc_detection_time (bs);
729 bfd_set_timer (bm, bs, now, 0);
733 bfd_add_transport_layer (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
735 switch (bs->transport)
737 case BFD_TRANSPORT_UDP4:
738 BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx);
739 bfd_add_udp4_transport (vm, bi, bs, 0 /* is_echo */ );
741 case BFD_TRANSPORT_UDP6:
742 BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx);
743 bfd_add_udp6_transport (vm, bi, bs, 0 /* is_echo */ );
749 bfd_transport_control_frame (vlib_main_t *vm, vlib_node_runtime_t *rt, u32 bi,
752 switch (bs->transport)
754 case BFD_TRANSPORT_UDP4:
755 BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx);
756 return bfd_transport_udp4 (vm, rt, bi, bs, 0 /* is_echo */);
758 case BFD_TRANSPORT_UDP6:
759 BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx);
760 return bfd_transport_udp6 (vm, rt, bi, bs, 0 /* is_echo */);
767 bfd_echo_add_transport_layer (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
769 switch (bs->transport)
771 case BFD_TRANSPORT_UDP4:
772 BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx);
773 return bfd_add_udp4_transport (vm, bi, bs, 1 /* is_echo */ );
775 case BFD_TRANSPORT_UDP6:
776 BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx);
777 return bfd_add_udp6_transport (vm, bi, bs, 1 /* is_echo */ );
784 bfd_transport_echo (vlib_main_t *vm, vlib_node_runtime_t *rt, u32 bi,
787 switch (bs->transport)
789 case BFD_TRANSPORT_UDP4:
790 BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx);
791 return bfd_transport_udp4 (vm, rt, bi, bs, 1 /* is_echo */);
793 case BFD_TRANSPORT_UDP6:
794 BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx);
795 return bfd_transport_udp6 (vm, rt, bi, bs, 1 /* is_echo */);
802 bfd_add_sha1_auth_section (vlib_main_t *vm, vlib_buffer_t *b,
805 bfd_pkt_with_sha1_auth_t *pkt = vlib_buffer_get_current (b);
806 bfd_auth_sha1_t *auth = &pkt->sha1_auth;
807 b->current_length += sizeof (*auth);
808 pkt->pkt.head.length += sizeof (*auth);
809 bfd_pkt_set_auth_present (&pkt->pkt);
810 clib_memset (auth, 0, sizeof (*auth));
811 auth->type_len.type = bs->auth.curr_key->auth_type;
813 * only meticulous authentication types require incrementing seq number
814 * for every message, but doing so doesn't violate the RFC
816 ++bs->auth.local_seq_number;
817 auth->type_len.len = sizeof (bfd_auth_sha1_t);
818 auth->key_id = bs->auth.curr_bfd_key_id;
819 auth->seq_num = clib_host_to_net_u32 (bs->auth.local_seq_number);
821 * first copy the password into the packet, then calculate the hash
822 * and finally replace the password with the calculated hash
824 clib_memcpy (auth->hash, bs->auth.curr_key->key,
825 sizeof (bs->auth.curr_key->key));
826 unsigned char hash[sizeof (auth->hash)];
829 vnet_crypto_op_init (&op, VNET_CRYPTO_OP_SHA1_HASH);
831 op.len = sizeof (*pkt);
833 vnet_crypto_process_ops (vm, &op, 1);
834 BFD_DBG ("hashing: %U", format_hex_bytes, pkt, sizeof (*pkt));
835 clib_memcpy (auth->hash, hash, sizeof (hash));
839 bfd_add_auth_section (vlib_main_t *vm, vlib_buffer_t *b, bfd_session_t *bs)
841 bfd_main_t *bm = &bfd_main;
842 if (bs->auth.curr_key)
844 const bfd_auth_type_e auth_type = bs->auth.curr_key->auth_type;
847 case BFD_AUTH_TYPE_reserved:
849 case BFD_AUTH_TYPE_simple_password:
851 case BFD_AUTH_TYPE_keyed_md5:
853 case BFD_AUTH_TYPE_meticulous_keyed_md5:
854 vlib_log_crit (bm->log_class,
855 "internal error, unexpected BFD auth type '%d'",
858 case BFD_AUTH_TYPE_keyed_sha1:
860 case BFD_AUTH_TYPE_meticulous_keyed_sha1:
861 bfd_add_sha1_auth_section (vm, b, bs);
868 bfd_is_echo_possible (bfd_session_t * bs)
870 if (BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state &&
871 bs->remote_min_echo_rx_usec > 0)
873 switch (bs->transport)
875 case BFD_TRANSPORT_UDP4:
876 return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP4);
877 case BFD_TRANSPORT_UDP6:
878 return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP6);
885 bfd_init_control_frame (bfd_session_t *bs, vlib_buffer_t *b)
887 bfd_pkt_t *pkt = vlib_buffer_get_current (b);
889 bfd_length = sizeof (bfd_pkt_t);
890 clib_memset (pkt, 0, sizeof (*pkt));
891 bfd_pkt_set_version (pkt, 1);
892 bfd_pkt_set_diag_code (pkt, bs->local_diag);
893 bfd_pkt_set_state (pkt, bs->local_state);
894 pkt->head.detect_mult = bs->local_detect_mult;
895 pkt->head.length = bfd_length;
896 pkt->my_disc = bs->local_discr;
897 pkt->your_disc = bs->remote_discr;
898 pkt->des_min_tx = clib_host_to_net_u32 (bs->config_desired_min_tx_usec);
902 clib_host_to_net_u32 (bfd_nsec_to_usec
903 (bs->effective_required_min_rx_nsec));
908 clib_host_to_net_u32 (bs->config_required_min_rx_usec);
910 pkt->req_min_echo_rx = clib_host_to_net_u32 (1);
911 b->current_length = bfd_length;
919 } bfd_process_trace_t;
922 bfd_process_trace_buf (vlib_main_t *vm, vlib_node_runtime_t *rt,
923 vlib_buffer_t *b, bfd_session_t *bs)
925 u32 n_trace = vlib_get_trace_count (vm, rt);
928 bfd_process_trace_t *tr;
929 if (vlib_trace_buffer (vm, rt, 0, b, 0))
931 tr = vlib_add_trace (vm, rt, b, sizeof (*tr));
932 tr->bs_idx = bs->bs_idx;
933 u64 len = (b->current_length < sizeof (tr->data)) ?
937 clib_memcpy_fast (tr->data, vlib_buffer_get_current (b), len);
939 vlib_set_trace_count (vm, rt, n_trace);
945 bfd_send_echo (vlib_main_t *vm, vlib_node_runtime_t *rt, bfd_main_t *bm,
946 bfd_session_t *bs, u64 now)
948 if (!bfd_is_echo_possible (bs))
950 BFD_DBG ("\nSwitching off echo function: %U", format_bfd_session, bs);
954 if (now >= bs->echo_tx_timeout_nsec)
956 BFD_DBG ("\nSending echo packet: %U", format_bfd_session, bs);
958 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
960 vlib_log_crit (bm->log_class, "buffer allocation failure");
963 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
964 ASSERT (b->current_data == 0);
965 bfd_echo_pkt_t *pkt = vlib_buffer_get_current (b);
966 clib_memset (pkt, 0, sizeof (*pkt));
967 pkt->discriminator = bs->local_discr;
968 pkt->expire_time_nsec =
969 now + bs->echo_transmit_interval_nsec * bs->local_detect_mult;
971 bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_nsec,
973 b->current_length = sizeof (*pkt);
974 bfd_process_trace_buf (vm, rt, b, bs);
975 if (!bfd_echo_add_transport_layer (vm, bi, bs))
977 BFD_ERR ("cannot send echo packet out, turning echo off");
979 vlib_buffer_free_one (vm, bi);
982 if (!bfd_transport_echo (vm, rt, bi, bs))
984 BFD_ERR ("cannot send echo packet out, turning echo off");
986 vlib_buffer_free_one (vm, bi);
989 bs->echo_last_tx_nsec = now;
990 bfd_calc_next_echo_tx (bs, now);
995 ("No need to send echo packet now, now is %lu, tx_timeout is %lu",
996 now, bs->echo_tx_timeout_nsec);
1001 bfd_send_periodic (vlib_main_t *vm, vlib_node_runtime_t *rt, bfd_main_t *bm,
1002 bfd_session_t *bs, u64 now)
1004 if (!bs->remote_min_rx_usec && BFD_POLL_NOT_NEEDED == bs->poll_state)
1006 BFD_DBG ("Remote min rx interval is zero, not sending periodic control "
1010 if (BFD_POLL_NOT_NEEDED == bs->poll_state && bs->remote_demand &&
1011 BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state)
1014 * A system MUST NOT periodically transmit BFD Control packets if Demand
1015 * mode is active on the remote system (bfd.RemoteDemandMode is 1,
1016 * bfd.SessionState is Up, and bfd.RemoteSessionState is Up) and a Poll
1017 * Sequence is not being transmitted.
1019 BFD_DBG ("Remote demand is set, not sending periodic control frame");
1022 if (now >= bs->tx_timeout_nsec)
1024 BFD_DBG ("\nSending periodic control frame: %U", format_bfd_session,
1027 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
1029 vlib_log_crit (bm->log_class, "buffer allocation failure");
1032 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1033 ASSERT (b->current_data == 0);
1034 bfd_init_control_frame (bs, b);
1035 switch (bs->poll_state)
1037 case BFD_POLL_NEEDED:
1038 if (now < bs->poll_state_start_or_timeout_nsec)
1040 BFD_DBG ("Cannot start a poll sequence yet, need to wait for "
1042 BFD_CLK_PRN (bs->poll_state_start_or_timeout_nsec -
1046 bs->poll_state_start_or_timeout_nsec = now;
1047 bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS);
1049 case BFD_POLL_IN_PROGRESS:
1050 case BFD_POLL_IN_PROGRESS_AND_QUEUED:
1051 bfd_pkt_set_poll (vlib_buffer_get_current (b));
1052 BFD_DBG ("Setting poll bit in packet, bs_idx=%u", bs->bs_idx);
1054 case BFD_POLL_NOT_NEEDED:
1058 bfd_add_auth_section (vm, b, bs);
1059 bfd_process_trace_buf (vm, rt, b, bs);
1060 bfd_add_transport_layer (vm, bi, bs);
1061 if (!bfd_transport_control_frame (vm, rt, bi, bs))
1063 vlib_buffer_free_one (vm, bi);
1065 bs->last_tx_nsec = now;
1066 bfd_calc_next_tx (bm, bs, now);
1071 ("No need to send control frame now, now is %lu, tx_timeout is %lu",
1072 now, bs->tx_timeout_nsec);
1077 bfd_init_final_control_frame (vlib_main_t *vm, vlib_buffer_t *b,
1080 BFD_DBG ("Send final control frame for bs_idx=%lu", bs->bs_idx);
1081 bfd_init_control_frame (bs, b);
1082 bfd_pkt_set_final (vlib_buffer_get_current (b));
1083 bfd_add_auth_section (vm, b, bs);
1084 u32 bi = vlib_get_buffer_index (vm, b);
1085 bfd_add_transport_layer (vm, bi, bs);
1086 bs->last_tx_nsec = bfd_time_now_nsec (vm, NULL);
1088 * RFC allows to include changes in final frame, so if there were any
1089 * pending, we already did that, thus we can clear any pending poll needs
1091 bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED);
1095 bfd_check_rx_timeout (vlib_main_t * vm, bfd_main_t * bm, bfd_session_t * bs,
1096 u64 now, int handling_wakeup)
1098 if (bs->last_rx_nsec + bs->detection_time_nsec <= now)
1100 BFD_DBG ("Rx timeout, session goes down");
1102 * RFC 5880 6.8.1. State Variables
1106 * The remote discriminator for this BFD session. This is the
1107 * discriminator chosen by the remote system, and is totally opaque
1108 * to the local system. This MUST be initialized to zero. If a
1109 * period of a Detection Time passes without the receipt of a valid,
1110 * authenticated BFD packet from the remote system, this variable
1111 * MUST be set to zero.
1113 bs->remote_discr = 0;
1114 bfd_set_diag (bs, BFD_DIAG_CODE_det_time_exp);
1115 bfd_set_state (vm, bm, bs, BFD_STATE_down, handling_wakeup);
1117 * If the remote system does not receive any
1118 * BFD Control packets for a Detection Time, it SHOULD reset
1119 * bfd.RemoteMinRxInterval to its initial value of 1 (per section 6.8.1,
1120 * since it is no longer required to maintain previous session state)
1121 * and then can transmit at its own rate.
1123 bfd_set_remote_required_min_rx (bs, 1);
1126 && bs->echo_last_rx_nsec +
1127 bs->echo_transmit_interval_nsec * bs->local_detect_mult <= now)
1129 BFD_DBG ("Echo rx timeout, session goes down");
1130 bfd_set_diag (bs, BFD_DIAG_CODE_echo_failed);
1131 bfd_set_state (vm, bm, bs, BFD_STATE_down, handling_wakeup);
1136 bfd_on_timeout (vlib_main_t *vm, vlib_node_runtime_t *rt, bfd_main_t *bm,
1137 bfd_session_t *bs, u64 now)
1139 BFD_DBG ("Timeout for bs_idx=%lu", bs->bs_idx);
1140 switch (bs->local_state)
1142 case BFD_STATE_admin_down:
1144 case BFD_STATE_down:
1145 bfd_send_periodic (vm, rt, bm, bs, now);
1147 case BFD_STATE_init:
1148 bfd_check_rx_timeout (vm, bm, bs, now, 1);
1149 bfd_send_periodic (vm, rt, bm, bs, now);
1152 bfd_check_rx_timeout (vm, bm, bs, now, 1);
1153 if (BFD_POLL_NOT_NEEDED == bs->poll_state && !bs->echo &&
1154 bfd_is_echo_possible (bs))
1156 /* switch on echo function as main detection method now */
1157 BFD_DBG ("Switching on echo function, bs_idx=%u", bs->bs_idx);
1159 bs->echo_last_rx_nsec = now;
1160 bs->echo_tx_timeout_nsec = now;
1161 bfd_set_effective_required_min_rx (
1162 bs, clib_max (bm->min_required_min_rx_while_echo_nsec,
1163 bs->config_required_min_rx_nsec));
1164 bfd_set_poll_state (bs, BFD_POLL_NEEDED);
1166 bfd_send_periodic (vm, rt, bm, bs, now);
1169 bfd_send_echo (vm, rt, bm, bs, now);
1176 format_bfd_process_trace (u8 *s, va_list *args)
1178 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1179 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1180 bfd_process_trace_t *t = va_arg (*args, bfd_process_trace_t *);
1183 format (s, "bs_idx=%u => %U", t->bs_idx, format_bfd_pkt, t->len, t->data);
1189 * bfd process node function
1192 bfd_process (vlib_main_t *vm, vlib_node_runtime_t *rt,
1193 CLIB_UNUSED (vlib_frame_t *f))
1195 bfd_main_t *bm = &bfd_main;
1197 uword event_type, *event_data = 0;
1199 /* So we can send events to the bfd process */
1200 bm->bfd_process_node_index = bfd_process_node.index;
1205 u64 now = bfd_time_now_nsec (vm, &vm_time);
1206 BFD_DBG ("wakeup, now is %llunsec, vlib_time_now() is %.9f", now,
1210 if (pool_elts (bm->sessions))
1212 u32 first_expires_in_ticks =
1213 TW (tw_timer_first_expires_in_ticks) (&bm->wheel);
1214 if (!first_expires_in_ticks)
1217 ("tw_timer_first_expires_in_ticks(%p) returns 0ticks",
1219 timeout = bm->wheel.next_run_time - vm_time;
1220 BFD_DBG ("wheel.next_run_time is %.9f",
1221 bm->wheel.next_run_time);
1222 u64 next_expire_nsec = now + timeout * SEC_PER_NSEC;
1223 bm->bfd_process_next_wakeup_nsec = next_expire_nsec;
1228 BFD_DBG ("tw_timer_first_expires_in_ticks(%p) returns %luticks",
1229 &bm->wheel, first_expires_in_ticks);
1230 u64 next_expire_nsec =
1231 now + first_expires_in_ticks * bm->nsec_per_tw_tick;
1232 bm->bfd_process_next_wakeup_nsec = next_expire_nsec;
1234 ASSERT (next_expire_nsec - now <= UINT32_MAX);
1235 // cast to u32 to avoid warning
1236 timeout = (u32) (next_expire_nsec - now) * SEC_PER_NSEC;
1238 BFD_DBG ("vlib_process_wait_for_event_or_clock(vm, %.09f)",
1240 (void) vlib_process_wait_for_event_or_clock (vm, timeout);
1245 (void) vlib_process_wait_for_event (vm);
1247 event_type = vlib_process_get_events (vm, &event_data);
1248 now = bfd_time_now_nsec (vm, &vm_time);
1249 uword *session_index;
1252 case ~0: /* no events => timeout */
1253 /* nothing to do here */
1255 case BFD_EVENT_RESCHEDULE:
1256 BFD_DBG ("reschedule event");
1258 bm->bfd_process_wakeup_event_delay_nsec =
1259 now - bm->bfd_process_wakeup_event_start_nsec;
1260 bm->bfd_process_wakeup_events_in_flight--;
1262 /* nothing to do here - reschedule is done automatically after
1263 * each event or timeout */
1265 case BFD_EVENT_NEW_SESSION:
1266 vec_foreach (session_index, event_data)
1269 if (!pool_is_free_index (bm->sessions, *session_index))
1272 pool_elt_at_index (bm->sessions, *session_index);
1273 bfd_send_periodic (vm, rt, bm, bs, now);
1274 bfd_set_timer (bm, bs, now, 1);
1278 BFD_DBG ("Ignoring event for non-existent session index %u",
1279 (u32) * session_index);
1284 case BFD_EVENT_CONFIG_CHANGED:
1285 vec_foreach (session_index, event_data)
1288 if (!pool_is_free_index (bm->sessions, *session_index))
1291 pool_elt_at_index (bm->sessions, *session_index);
1292 bfd_on_config_change (bm, bs, now);
1296 BFD_DBG ("Ignoring event for non-existent session index %u",
1297 (u32) * session_index);
1303 vlib_log_err (bm->log_class, "BUG: event type 0x%wx", event_type);
1306 BFD_DBG ("tw_timer_expire_timers_vec(%p, %.04f);", &bm->wheel, vm_time);
1309 TW (tw_timer_expire_timers_vec) (&bm->wheel, vm_time, expired);
1310 BFD_DBG ("Expired %d elements", vec_len (expired));
1312 vec_foreach (p, expired)
1314 const u32 bs_idx = *p;
1315 if (!pool_is_free_index (bm->sessions, bs_idx))
1317 bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
1318 bs->tw_id = 0; /* timer is gone because it expired */
1319 bfd_on_timeout (vm, rt, bm, bs, now);
1320 bfd_set_timer (bm, bs, now, 1);
1326 vec_set_len (expired, 0);
1330 vec_set_len (event_data, 0);
1338 * bfd process node declaration
1341 VLIB_REGISTER_NODE (bfd_process_node, static) =
1343 .function = bfd_process,
1344 .type = VLIB_NODE_TYPE_PROCESS,
1345 .name = "bfd-process",
1346 .flags = (VLIB_NODE_FLAG_TRACE_SUPPORTED),
1347 .format_trace = format_bfd_process_trace,
1348 .n_next_nodes = BFD_TX_N_NEXT,
1350 [BFD_TX_IP4_ARP] = "ip4-arp",
1351 [BFD_TX_IP6_NDP] = "ip6-discover-neighbor",
1352 [BFD_TX_IP4_REWRITE] = "ip4-rewrite",
1353 [BFD_TX_IP6_REWRITE] = "ip6-rewrite",
1354 [BFD_TX_IP4_MIDCHAIN] = "ip4-midchain",
1355 [BFD_TX_IP6_MIDCHAIN] = "ip6-midchain",
1360 static clib_error_t *
1361 bfd_sw_interface_up_down (CLIB_UNUSED (vnet_main_t *vnm),
1362 CLIB_UNUSED (u32 sw_if_index), u32 flags)
1364 // bfd_main_t *bm = &bfd_main;
1365 // vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1366 if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1373 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (bfd_sw_interface_up_down);
1375 static clib_error_t *
1376 bfd_hw_interface_up_down (CLIB_UNUSED (vnet_main_t *vnm),
1377 CLIB_UNUSED (u32 hw_if_index), u32 flags)
1379 // bfd_main_t *bm = &bfd_main;
1380 if (flags & VNET_HW_INTERFACE_FLAG_LINK_UP)
1387 VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bfd_hw_interface_up_down);
1390 bfd_register_listener (bfd_notify_fn_t fn)
1392 bfd_main_t *bm = &bfd_main;
1394 vec_add1 (bm->listeners, fn);
1400 static clib_error_t *
1401 bfd_main_init (vlib_main_t * vm)
1403 vlib_thread_main_t *tm = &vlib_thread_main;
1404 u32 n_vlib_mains = tm->n_vlib_mains;
1406 setbuf (stdout, NULL);
1408 bfd_main_t *bm = &bfd_main;
1409 bm->random_seed = random_default_seed ();
1411 bm->vnet_main = vnet_get_main ();
1412 clib_memset (&bm->wheel, 0, sizeof (bm->wheel));
1413 bm->nsec_per_tw_tick = (f64) NSEC_PER_SEC / BFD_TW_TPS;
1414 bm->default_desired_min_tx_nsec =
1415 bfd_usec_to_nsec (BFD_DEFAULT_DESIRED_MIN_TX_USEC);
1416 bm->min_required_min_rx_while_echo_nsec =
1417 bfd_usec_to_nsec (BFD_REQUIRED_MIN_RX_USEC_WHILE_ECHO);
1418 BFD_DBG ("tw_timer_wheel_init(%p, %p, %.04f, %u)", &bm->wheel, NULL,
1419 1.00 / BFD_TW_TPS, ~0);
1420 TW (tw_timer_wheel_init) (&bm->wheel, NULL, 1.00 / BFD_TW_TPS, ~0);
1421 bm->log_class = vlib_log_register_class ("bfd", 0);
1422 vlib_log_debug (bm->log_class, "initialized");
1423 bm->owner_thread_index = ~0;
1424 if (n_vlib_mains > 1)
1425 clib_spinlock_init (&bm->lock);
1426 bm->rx_counter.name = "bfd rx session counters";
1427 bm->rx_counter.stat_segment_name = "/bfd/rx-session-counters";
1428 bm->rx_echo_counter.name = "bfd rx session echo counters";
1429 bm->rx_echo_counter.stat_segment_name = "/bfd/rx-session-echo-counters";
1430 bm->tx_counter.name = "bfd tx session counters";
1431 bm->tx_counter.stat_segment_name = "/bfd/tx-session-counters";
1432 bm->tx_echo_counter.name = "bfd tx session echo counters";
1433 bm->tx_echo_counter.stat_segment_name = "/bfd/tx-session-echo-counters";
1437 VLIB_INIT_FUNCTION (bfd_main_init);
1440 bfd_get_session (bfd_main_t * bm, bfd_transport_e t)
1442 bfd_session_t *result;
1446 pool_get (bm->sessions, result);
1447 clib_memset (result, 0, sizeof (*result));
1448 result->bs_idx = result - bm->sessions;
1449 result->transport = t;
1450 const unsigned limit = 1000;
1451 unsigned counter = 0;
1454 result->local_discr = random_u32 (&bm->random_seed);
1455 if (counter > limit)
1457 vlib_log_crit (bm->log_class,
1458 "couldn't allocate unused session discriminator even "
1459 "after %u tries!", limit);
1460 pool_put (bm->sessions, result);
1466 while (hash_get (bm->session_by_disc, result->local_discr));
1467 bfd_set_defaults (bm, result);
1468 hash_set (bm->session_by_disc, result->local_discr, result->bs_idx);
1469 bfd_validate_counters (bm);
1470 vlib_zero_combined_counter (&bm->rx_counter, result->bs_idx);
1471 vlib_zero_combined_counter (&bm->rx_echo_counter, result->bs_idx);
1472 vlib_zero_combined_counter (&bm->tx_counter, result->bs_idx);
1473 vlib_zero_combined_counter (&bm->tx_echo_counter, result->bs_idx);
1479 bfd_put_session (bfd_main_t * bm, bfd_session_t * bs)
1483 vlib_log_info (bm->log_class, "delete session: %U",
1484 format_bfd_session_brief, bs);
1485 if (bs->auth.curr_key)
1487 --bs->auth.curr_key->use_count;
1489 if (bs->auth.next_key)
1491 --bs->auth.next_key->use_count;
1493 hash_unset (bm->session_by_disc, bs->local_discr);
1494 vlib_zero_combined_counter (&bm->rx_counter, bs->bs_idx);
1495 vlib_zero_combined_counter (&bm->rx_echo_counter, bs->bs_idx);
1496 vlib_zero_combined_counter (&bm->tx_counter, bs->bs_idx);
1497 vlib_zero_combined_counter (&bm->tx_echo_counter, bs->bs_idx);
1498 pool_put (bm->sessions, bs);
1503 bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx)
1505 bfd_lock_check (bm);
1506 if (!pool_is_free_index (bm->sessions, bs_idx))
1508 return pool_elt_at_index (bm->sessions, bs_idx);
1514 bfd_find_session_by_disc (bfd_main_t * bm, u32 disc)
1516 bfd_lock_check (bm);
1517 uword *p = hash_get (bfd_main.session_by_disc, disc);
1520 return pool_elt_at_index (bfd_main.sessions, *p);
1526 * @brief verify bfd packet - common checks
1530 * @return 1 if bfd packet is valid
1533 bfd_verify_pkt_common (const bfd_pkt_t *pkt)
1535 if (1 != bfd_pkt_get_version (pkt))
1537 BFD_ERR ("BFD verification failed - unexpected version: '%d'",
1538 bfd_pkt_get_version (pkt));
1539 return BFD_ERROR_VERSION;
1541 if (pkt->head.length < sizeof (bfd_pkt_t) ||
1542 (bfd_pkt_get_auth_present (pkt) &&
1543 pkt->head.length < sizeof (bfd_pkt_with_common_auth_t)))
1545 BFD_ERR ("BFD verification failed - unexpected length: '%d' (auth "
1547 pkt->head.length, bfd_pkt_get_auth_present (pkt));
1548 return BFD_ERROR_LENGTH;
1550 if (!pkt->head.detect_mult)
1552 BFD_ERR ("BFD verification failed - unexpected detect-mult: '%d'",
1553 pkt->head.detect_mult);
1554 return BFD_ERROR_DETECT_MULTI;
1556 if (bfd_pkt_get_multipoint (pkt))
1558 BFD_ERR ("BFD verification failed - unexpected multipoint: '%d'",
1559 bfd_pkt_get_multipoint (pkt));
1560 return BFD_ERROR_MULTI_POINT;
1564 BFD_ERR ("BFD verification failed - unexpected my-disc: '%d'",
1566 return BFD_ERROR_MY_DISC;
1568 if (!pkt->your_disc)
1570 const u8 pkt_state = bfd_pkt_get_state (pkt);
1571 if (pkt_state != BFD_STATE_down && pkt_state != BFD_STATE_admin_down)
1573 BFD_ERR ("BFD verification failed - unexpected state: '%s' "
1574 "(your-disc is zero)", bfd_state_string (pkt_state));
1575 return BFD_ERROR_YOUR_DISC;
1578 return BFD_ERROR_NONE;
1582 bfd_session_switch_auth_to_next (bfd_session_t * bs)
1584 BFD_DBG ("Switching authentication key from %U to %U for bs_idx=%u",
1585 format_bfd_auth_key, bs->auth.curr_key, format_bfd_auth_key,
1586 bs->auth.next_key, bs->bs_idx);
1587 bs->auth.is_delayed = 0;
1588 if (bs->auth.curr_key)
1590 --bs->auth.curr_key->use_count;
1592 bs->auth.curr_key = bs->auth.next_key;
1593 bs->auth.next_key = NULL;
1594 bs->auth.curr_bfd_key_id = bs->auth.next_bfd_key_id;
1598 bfd_auth_type_is_meticulous (bfd_auth_type_e auth_type)
1600 if (BFD_AUTH_TYPE_meticulous_keyed_md5 == auth_type ||
1601 BFD_AUTH_TYPE_meticulous_keyed_sha1 == auth_type)
1609 bfd_verify_pkt_auth_seq_num (vlib_main_t * vm, bfd_session_t * bs,
1610 u32 received_seq_num, int is_meticulous)
1615 * This variable MUST be set to zero after no packets have been
1616 * received on this session for at least twice the Detection Time.
1618 u64 now = bfd_time_now_nsec (vm, NULL);
1619 if (now - bs->last_rx_nsec > bs->detection_time_nsec * 2)
1621 BFD_DBG ("BFD peer unresponsive for %lu nsec, which is > 2 * "
1622 "detection_time=%u nsec, resetting remote_seq_number_known "
1623 "flag", now - bs->last_rx_nsec, bs->detection_time_nsec * 2);
1624 bs->auth.remote_seq_number_known = 0;
1626 if (bs->auth.remote_seq_number_known)
1628 /* remote sequence number is known, verify its validity */
1629 const u32 max_u32 = 0xffffffff;
1630 /* the calculation might wrap, account for the special case... */
1631 if (bs->auth.remote_seq_number > max_u32 - 3 * bs->local_detect_mult)
1637 * |----------+----------------------------+-----------|
1639 * | remote_seq_num------+
1641 * +-----(remote_seq_num + 3*detect_mult) % * 0xffffffff
1643 * x + y + z = 0xffffffff
1644 * x + z = 3 * detect_mult
1646 const u32 z = max_u32 - bs->auth.remote_seq_number;
1647 const u32 x = 3 * bs->local_detect_mult - z;
1648 if (received_seq_num > x &&
1649 received_seq_num < bs->auth.remote_seq_number + is_meticulous)
1652 ("Recvd sequence number=%u out of ranges <0, %u>, <%u, %u>",
1653 received_seq_num, x,
1654 bs->auth.remote_seq_number + is_meticulous, max_u32);
1661 const u32 min = bs->auth.remote_seq_number + is_meticulous;
1663 bs->auth.remote_seq_number + 3 * bs->local_detect_mult;
1664 if (received_seq_num < min || received_seq_num > max)
1666 BFD_ERR ("Recvd sequence number=%u out of range <%u, %u>",
1667 received_seq_num, min, max);
1676 bfd_verify_pkt_auth_key_sha1 (vlib_main_t *vm, const bfd_pkt_t *pkt,
1677 u32 pkt_size, CLIB_UNUSED (bfd_session_t *bs),
1678 u8 bfd_key_id, bfd_auth_key_t *auth_key)
1680 ASSERT (auth_key->auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
1681 auth_key->auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1);
1683 bfd_pkt_with_common_auth_t *with_common = (void *) pkt;
1684 if (pkt_size < sizeof (*with_common))
1686 BFD_ERR ("Packet size too small to hold authentication common header");
1689 if (with_common->common_auth.type != auth_key->auth_type)
1691 BFD_ERR ("BFD auth type mismatch, packet auth=%d:%s doesn't match "
1692 "in-use auth=%d:%s",
1693 with_common->common_auth.type,
1694 bfd_auth_type_str (with_common->common_auth.type),
1695 auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
1698 bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt;
1699 if (pkt_size < sizeof (*with_sha1) ||
1700 with_sha1->sha1_auth.type_len.len < sizeof (with_sha1->sha1_auth))
1703 ("BFD size mismatch, payload size=%u, expected=%u, auth_len=%u, "
1704 "expected=%u", pkt_size, sizeof (*with_sha1),
1705 with_sha1->sha1_auth.type_len.len, sizeof (with_sha1->sha1_auth));
1708 if (with_sha1->sha1_auth.key_id != bfd_key_id)
1711 ("BFD key ID mismatch, packet key ID=%u doesn't match key ID=%u%s",
1712 with_sha1->sha1_auth.key_id, bfd_key_id,
1714 auth.is_delayed ? " (but a delayed auth change is scheduled)" : "");
1718 u8 hash_from_packet[STRUCT_SIZE_OF (bfd_auth_sha1_t, hash)];
1719 u8 calculated_hash[STRUCT_SIZE_OF (bfd_auth_sha1_t, hash)];
1720 clib_memcpy (hash_from_packet, with_sha1->sha1_auth.hash,
1721 sizeof (with_sha1->sha1_auth.hash));
1722 clib_memcpy (with_sha1->sha1_auth.hash, auth_key->key,
1723 sizeof (auth_key->key));
1724 vnet_crypto_op_t op;
1725 vnet_crypto_op_init (&op, VNET_CRYPTO_OP_SHA1_HASH);
1726 op.src = (u8 *) with_sha1;
1727 op.len = sizeof (*with_sha1);
1728 op.digest = calculated_hash;
1729 vnet_crypto_process_ops (vm, &op, 1);
1731 /* Restore the modified data within the packet */
1732 clib_memcpy (with_sha1->sha1_auth.hash, hash_from_packet,
1733 sizeof (with_sha1->sha1_auth.hash));
1736 memcmp (calculated_hash, hash_from_packet, sizeof (calculated_hash)))
1738 clib_memcpy (with_sha1->sha1_auth.hash, hash_from_packet,
1739 sizeof (hash_from_packet));
1742 BFD_ERR ("SHA1 hash: %U doesn't match the expected value: %U",
1743 format_hex_bytes, hash_from_packet, sizeof (hash_from_packet),
1744 format_hex_bytes, calculated_hash, sizeof (calculated_hash));
1749 bfd_verify_pkt_auth_key (vlib_main_t * vm, const bfd_pkt_t * pkt,
1750 u32 pkt_size, bfd_session_t * bs, u8 bfd_key_id,
1751 bfd_auth_key_t * auth_key)
1753 bfd_main_t *bm = &bfd_main;
1754 switch (auth_key->auth_type)
1756 case BFD_AUTH_TYPE_reserved:
1757 vlib_log_err (bm->log_class,
1758 "internal error, unexpected auth_type=%d:%s",
1759 auth_key->auth_type,
1760 bfd_auth_type_str (auth_key->auth_type));
1762 case BFD_AUTH_TYPE_simple_password:
1764 case BFD_AUTH_TYPE_keyed_md5:
1766 case BFD_AUTH_TYPE_meticulous_keyed_md5:
1769 "internal error, not implemented, unexpected auth_type=%d:%s",
1770 auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
1772 case BFD_AUTH_TYPE_keyed_sha1:
1774 case BFD_AUTH_TYPE_meticulous_keyed_sha1:
1777 const u32 seq_num = clib_net_to_host_u32 (((bfd_pkt_with_sha1_auth_t
1780 return bfd_verify_pkt_auth_seq_num (
1782 bfd_auth_type_is_meticulous (auth_key->auth_type)) &&
1783 bfd_verify_pkt_auth_key_sha1 (vm, pkt, pkt_size, bs,
1784 bfd_key_id, auth_key);
1792 * @brief verify bfd packet - authentication
1796 * @return 1 if bfd packet is valid
1799 bfd_verify_pkt_auth (vlib_main_t * vm, const bfd_pkt_t * pkt, u16 pkt_size,
1802 if (bfd_pkt_get_auth_present (pkt))
1804 /* authentication present in packet */
1805 if (!bs->auth.curr_key)
1807 /* currently not using authentication - can we turn it on? */
1808 if (bs->auth.is_delayed && bs->auth.next_key)
1810 /* yes, switch is scheduled - make sure the auth is valid */
1811 if (bfd_verify_pkt_auth_key (vm, pkt, pkt_size, bs,
1812 bs->auth.next_bfd_key_id,
1815 /* auth matches next key, do the switch, packet is valid */
1816 bfd_session_switch_auth_to_next (bs);
1823 /* yes, using authentication, verify the key */
1824 if (bfd_verify_pkt_auth_key (vm, pkt, pkt_size, bs,
1825 bs->auth.curr_bfd_key_id,
1828 /* verification passed, packet is valid */
1833 /* verification failed - but maybe we need to switch key */
1834 if (bs->auth.is_delayed && bs->auth.next_key)
1836 /* delayed switch present, verify if that key works */
1837 if (bfd_verify_pkt_auth_key (vm, pkt, pkt_size, bs,
1838 bs->auth.next_bfd_key_id,
1841 /* auth matches next key, switch key, packet is valid */
1842 bfd_session_switch_auth_to_next (bs);
1851 /* authentication in packet not present */
1852 if (pkt_size > sizeof (*pkt))
1854 BFD_ERR ("BFD verification failed - unexpected packet size '%d' "
1855 "(auth not present)", pkt_size);
1858 if (bs->auth.curr_key)
1860 /* currently authenticating - could we turn it off? */
1861 if (bs->auth.is_delayed && !bs->auth.next_key)
1863 /* yes, delayed switch to NULL key is scheduled */
1864 bfd_session_switch_auth_to_next (bs);
1870 /* no auth in packet, no auth in use - packet is valid */
1878 bfd_consume_pkt (vlib_main_t *vm, bfd_main_t *bm, const bfd_pkt_t *pkt,
1881 bfd_lock_check (bm);
1883 bfd_session_t *bs = bfd_find_session_by_idx (bm, bs_idx);
1884 if (!bs || (pkt->your_disc && pkt->your_disc != bs->local_discr))
1886 return BFD_ERROR_YOUR_DISC;
1888 BFD_DBG ("Scanning bfd packet, bs_idx=%d", bs->bs_idx);
1889 bs->remote_discr = pkt->my_disc;
1890 bs->remote_state = bfd_pkt_get_state (pkt);
1891 bs->remote_demand = bfd_pkt_get_demand (pkt);
1892 bs->remote_diag = bfd_pkt_get_diag_code (pkt);
1893 u64 now = bfd_time_now_nsec (vm, NULL);
1894 bs->last_rx_nsec = now;
1895 if (bfd_pkt_get_auth_present (pkt))
1897 bfd_auth_type_e auth_type =
1898 ((bfd_pkt_with_common_auth_t *) (pkt))->common_auth.type;
1901 case BFD_AUTH_TYPE_reserved:
1903 case BFD_AUTH_TYPE_simple_password:
1905 case BFD_AUTH_TYPE_keyed_md5:
1907 case BFD_AUTH_TYPE_meticulous_keyed_md5:
1908 vlib_log_crit (bm->log_class,
1909 "internal error, unexpected auth_type=%d:%s",
1910 auth_type, bfd_auth_type_str (auth_type));
1912 case BFD_AUTH_TYPE_keyed_sha1:
1914 case BFD_AUTH_TYPE_meticulous_keyed_sha1:
1917 bfd_pkt_with_sha1_auth_t *with_sha1 =
1918 (bfd_pkt_with_sha1_auth_t *) pkt;
1919 bs->auth.remote_seq_number =
1920 clib_net_to_host_u32 (with_sha1->sha1_auth.seq_num);
1921 bs->auth.remote_seq_number_known = 1;
1922 BFD_DBG ("Received sequence number %u",
1923 bs->auth.remote_seq_number);
1928 bs->remote_desired_min_tx_nsec =
1929 bfd_usec_to_nsec (clib_net_to_host_u32 (pkt->des_min_tx));
1930 bs->remote_detect_mult = pkt->head.detect_mult;
1931 bfd_set_remote_required_min_rx (bs, clib_net_to_host_u32 (pkt->req_min_rx));
1932 bfd_set_remote_required_min_echo_rx (
1933 bs, clib_net_to_host_u32 (pkt->req_min_echo_rx));
1934 if (bfd_pkt_get_final (pkt))
1936 if (BFD_POLL_IN_PROGRESS == bs->poll_state)
1938 BFD_DBG ("Poll sequence terminated, bs_idx=%u", bs->bs_idx);
1939 bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED);
1940 if (BFD_STATE_up == bs->local_state)
1942 bfd_set_effective_desired_min_tx (
1943 bm, bs, now, bs->config_desired_min_tx_nsec);
1944 bfd_set_effective_required_min_rx (
1946 clib_max (bs->echo * bm->min_required_min_rx_while_echo_nsec,
1947 bs->config_required_min_rx_nsec));
1950 else if (BFD_POLL_IN_PROGRESS_AND_QUEUED == bs->poll_state)
1953 * next poll sequence must be delayed by at least the round trip
1954 * time, so calculate that here
1956 BFD_DBG ("Next poll sequence can commence in " BFD_CLK_FMT,
1957 BFD_CLK_PRN (now - bs->poll_state_start_or_timeout_nsec));
1958 bs->poll_state_start_or_timeout_nsec =
1959 now + (now - bs->poll_state_start_or_timeout_nsec);
1961 ("Poll sequence terminated, but another is needed, bs_idx=%u",
1963 bfd_set_poll_state (bs, BFD_POLL_NEEDED);
1966 bfd_calc_next_tx (bm, bs, now);
1967 bfd_set_timer (bm, bs, now, 0);
1968 if (BFD_STATE_admin_down == bs->local_state)
1970 BFD_DBG ("Session is admin-down, ignoring packet, bs_idx=%u",
1972 return BFD_ERROR_ADMIN_DOWN;
1974 if (BFD_STATE_admin_down == bs->remote_state)
1976 bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
1977 bfd_set_state (vm, bm, bs, BFD_STATE_down, 0);
1979 else if (BFD_STATE_down == bs->local_state)
1981 if (BFD_STATE_down == bs->remote_state)
1983 bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
1984 bfd_set_state (vm, bm, bs, BFD_STATE_init, 0);
1986 else if (BFD_STATE_init == bs->remote_state)
1988 bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
1989 bfd_set_state (vm, bm, bs, BFD_STATE_up, 0);
1992 else if (BFD_STATE_init == bs->local_state)
1994 if (BFD_STATE_up == bs->remote_state ||
1995 BFD_STATE_init == bs->remote_state)
1997 bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
1998 bfd_set_state (vm, bm, bs, BFD_STATE_up, 0);
2001 else /* BFD_STATE_up == bs->local_state */
2003 if (BFD_STATE_down == bs->remote_state)
2005 bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
2006 bfd_set_state (vm, bm, bs, BFD_STATE_down, 0);
2009 return BFD_ERROR_NONE;
2013 bfd_consume_echo_pkt (vlib_main_t *vm, bfd_main_t *bm, vlib_buffer_t *b)
2015 bfd_echo_pkt_t *pkt = NULL;
2016 if (b->current_length != sizeof (*pkt))
2020 pkt = vlib_buffer_get_current (b);
2021 bfd_session_t *bs = bfd_find_session_by_disc (bm, pkt->discriminator);
2026 BFD_DBG ("Scanning bfd echo packet, bs_idx=%d", bs->bs_idx);
2028 bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_nsec,
2030 if (checksum != pkt->checksum)
2032 BFD_DBG ("Invalid echo packet, checksum mismatch");
2035 u64 now = bfd_time_now_nsec (vm, NULL);
2036 if (pkt->expire_time_nsec < now)
2038 BFD_DBG ("Stale packet received, expire time %lu < now %lu",
2039 pkt->expire_time_nsec, now);
2043 bs->echo_last_rx_nsec = now;
2049 format_bfd_session (u8 * s, va_list * args)
2051 const bfd_session_t *bs = va_arg (*args, bfd_session_t *);
2052 s = format (s, "bs_idx=%u local-state=%s remote-state=%s\n"
2053 "local-discriminator=%u remote-discriminator=%u\n"
2054 "local-diag=%s echo-active=%s\n"
2055 "desired-min-tx=%u required-min-rx=%u\n"
2056 "required-min-echo-rx=%u detect-mult=%u\n"
2057 "remote-min-rx=%u remote-min-echo-rx=%u\n"
2058 "remote-demand=%s poll-state=%s\n"
2059 "auth: local-seq-num=%u remote-seq-num=%u\n"
2063 bs->bs_idx, bfd_state_string (bs->local_state),
2064 bfd_state_string (bs->remote_state), bs->local_discr,
2065 bs->remote_discr, bfd_diag_code_string (bs->local_diag),
2066 (bs->echo ? "yes" : "no"), bs->config_desired_min_tx_usec,
2067 bs->config_required_min_rx_usec, 1, bs->local_detect_mult,
2068 bs->remote_min_rx_usec, bs->remote_min_echo_rx_usec,
2069 (bs->remote_demand ? "yes" : "no"),
2070 bfd_poll_state_string (bs->poll_state),
2071 bs->auth.local_seq_number, bs->auth.remote_seq_number,
2072 (bs->auth.is_delayed ? "yes" : "no"),
2073 format_bfd_auth_key, bs->auth.curr_key, format_bfd_auth_key,
2079 format_bfd_session_brief (u8 * s, va_list * args)
2081 const bfd_session_t *bs = va_arg (*args, bfd_session_t *);
2083 format (s, "bs_idx=%u local-state=%s remote-state=%s", bs->bs_idx,
2084 bfd_state_string (bs->local_state),
2085 bfd_state_string (bs->remote_state));
2090 bfd_auth_type_supported (bfd_auth_type_e auth_type)
2092 if (auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
2093 auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1)
2101 bfd_auth_activate (bfd_session_t * bs, u32 conf_key_id,
2102 u8 bfd_key_id, u8 is_delayed)
2104 bfd_main_t *bm = &bfd_main;
2105 const uword *key_idx_p =
2106 hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
2109 vlib_log_err (bm->log_class,
2110 "authentication key with config ID %u doesn't exist)",
2112 return VNET_API_ERROR_BFD_ENOENT;
2114 const uword key_idx = *key_idx_p;
2115 bfd_auth_key_t *key = pool_elt_at_index (bm->auth_keys, key_idx);
2118 if (bs->auth.next_key == key && bs->auth.next_bfd_key_id == bfd_key_id)
2120 /* already using this key, no changes required */
2123 if (bs->auth.next_key != key)
2126 bs->auth.next_key = key;
2128 bs->auth.next_bfd_key_id = bfd_key_id;
2129 bs->auth.is_delayed = 1;
2133 if (bs->auth.curr_key == key && bs->auth.curr_bfd_key_id == bfd_key_id)
2135 /* already using this key, no changes required */
2139 if (bs->auth.curr_key)
2141 --bs->auth.curr_key->use_count;
2143 bs->auth.curr_key = key;
2144 bs->auth.curr_bfd_key_id = bfd_key_id;
2145 bs->auth.is_delayed = 0;
2147 BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs);
2148 vlib_log_info (bm->log_class, "session auth modified: %U",
2149 format_bfd_session_brief, bs);
2154 bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed)
2156 bfd_main_t *bm = &bfd_main;
2159 /* not delayed - deactivate the current key right now */
2160 if (bs->auth.curr_key)
2162 --bs->auth.curr_key->use_count;
2163 bs->auth.curr_key = NULL;
2165 bs->auth.is_delayed = 0;
2169 /* delayed - mark as so */
2170 bs->auth.is_delayed = 1;
2173 * clear the next key unconditionally - either the auth change is not delayed
2174 * in which case the caller expects the session to not use authentication
2175 * from this point forward, or it is delayed, in which case the next_key
2176 * needs to be set to NULL to make it so in the future
2178 if (bs->auth.next_key)
2180 --bs->auth.next_key->use_count;
2181 bs->auth.next_key = NULL;
2183 BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs);
2184 vlib_log_info (bm->log_class, "session auth modified: %U",
2185 format_bfd_session_brief, bs);
2190 bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs,
2191 u32 desired_min_tx_usec,
2192 u32 required_min_rx_usec, u8 detect_mult)
2194 if (bs->local_detect_mult != detect_mult ||
2195 bs->config_desired_min_tx_usec != desired_min_tx_usec ||
2196 bs->config_required_min_rx_usec != required_min_rx_usec)
2198 BFD_DBG ("\nChanging session params: %U", format_bfd_session, bs);
2199 switch (bs->poll_state)
2201 case BFD_POLL_NOT_NEEDED:
2202 if (BFD_STATE_up == bs->local_state ||
2203 BFD_STATE_init == bs->local_state)
2205 /* poll sequence is not needed for detect multiplier change */
2206 if (bs->config_desired_min_tx_usec != desired_min_tx_usec ||
2207 bs->config_required_min_rx_usec != required_min_rx_usec)
2209 bfd_set_poll_state (bs, BFD_POLL_NEEDED);
2213 case BFD_POLL_NEEDED:
2214 case BFD_POLL_IN_PROGRESS_AND_QUEUED:
2216 * nothing to do - will be handled in the future poll which is
2217 * already scheduled for execution
2220 case BFD_POLL_IN_PROGRESS:
2221 /* poll sequence is not needed for detect multiplier change */
2222 if (bs->config_desired_min_tx_usec != desired_min_tx_usec ||
2223 bs->config_required_min_rx_usec != required_min_rx_usec)
2225 BFD_DBG ("Poll in progress, queueing extra poll, bs_idx=%u",
2227 bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS_AND_QUEUED);
2231 bs->local_detect_mult = detect_mult;
2232 bs->config_desired_min_tx_usec = desired_min_tx_usec;
2233 bs->config_desired_min_tx_nsec = bfd_usec_to_nsec (desired_min_tx_usec);
2234 bs->config_required_min_rx_usec = required_min_rx_usec;
2235 bs->config_required_min_rx_nsec =
2236 bfd_usec_to_nsec (required_min_rx_usec);
2237 BFD_DBG ("\nChanged session params: %U", format_bfd_session, bs);
2239 vlib_log_info (bm->log_class, "changed session params: %U",
2240 format_bfd_session_brief, bs);
2241 vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index,
2242 BFD_EVENT_CONFIG_CHANGED, bs->bs_idx);
2246 BFD_DBG ("Ignore parameter change - no change, bs_idx=%u", bs->bs_idx);
2252 bfd_auth_set_key (u32 conf_key_id, u8 auth_type, u8 key_len,
2253 const u8 * key_data)
2255 bfd_main_t *bm = &bfd_main;
2256 bfd_auth_key_t *auth_key = NULL;
2257 if (!key_len || key_len > bfd_max_key_len_for_auth_type (auth_type))
2259 vlib_log_err (bm->log_class,
2260 "invalid authentication key length for auth_type=%d:%s "
2261 "(key_len=%u, must be non-zero, expected max=%u)",
2262 auth_type, bfd_auth_type_str (auth_type), key_len,
2263 (u32) bfd_max_key_len_for_auth_type (auth_type));
2264 return VNET_API_ERROR_INVALID_VALUE;
2266 if (!bfd_auth_type_supported (auth_type))
2268 vlib_log_err (bm->log_class, "unsupported auth type=%d:%s", auth_type,
2269 bfd_auth_type_str (auth_type));
2270 return VNET_API_ERROR_BFD_NOTSUPP;
2272 uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
2275 /* modifying existing key - must not be used */
2276 const uword key_idx = *key_idx_p;
2277 auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
2278 if (auth_key->use_count > 0)
2280 vlib_log_err (bm->log_class,
2281 "authentication key with conf ID %u in use by %u BFD "
2282 "session(s) - cannot modify", conf_key_id,
2283 auth_key->use_count);
2284 return VNET_API_ERROR_BFD_EINUSE;
2289 /* adding new key */
2290 pool_get (bm->auth_keys, auth_key);
2291 auth_key->conf_key_id = conf_key_id;
2292 hash_set (bm->auth_key_by_conf_key_id, conf_key_id,
2293 auth_key - bm->auth_keys);
2295 auth_key->auth_type = auth_type;
2296 clib_memset (auth_key->key, 0, sizeof (auth_key->key));
2297 clib_memcpy (auth_key->key, key_data, key_len);
2302 bfd_auth_del_key (u32 conf_key_id)
2304 bfd_auth_key_t *auth_key = NULL;
2305 bfd_main_t *bm = &bfd_main;
2306 uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
2309 /* deleting existing key - must not be used */
2310 const uword key_idx = *key_idx_p;
2311 auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
2312 if (auth_key->use_count > 0)
2314 vlib_log_err (bm->log_class,
2315 "authentication key with conf ID %u in use by %u BFD "
2316 "session(s) - cannot delete", conf_key_id,
2317 auth_key->use_count);
2318 return VNET_API_ERROR_BFD_EINUSE;
2320 hash_unset (bm->auth_key_by_conf_key_id, conf_key_id);
2321 clib_memset (auth_key, 0, sizeof (*auth_key));
2322 pool_put (bm->auth_keys, auth_key);
2327 vlib_log_err (bm->log_class,
2328 "authentication key with conf ID %u does not exist",
2330 return VNET_API_ERROR_BFD_ENOENT;
2335 bfd_main_t bfd_main;
2338 * fd.io coding-style-patch-verification: ON
2341 * eval: (c-set-style "gnu")