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_calc_echo_checksum (u32 discriminator, u64 expire_time, u32 secret)
37 #if defined(clib_crc32c_uses_intrinsics) && !defined (__i386__)
38 checksum = clib_crc32c_u64 (0, discriminator);
39 checksum = clib_crc32c_u64 (checksum, expire_time);
40 checksum = clib_crc32c_u64 (checksum, secret);
42 checksum = clib_xxhash (discriminator ^ expire_time ^ secret);
48 bfd_usec_to_nsec (u64 us)
50 return us * NSEC_PER_USEC;
54 bfd_nsec_to_usec (u64 nsec)
56 return nsec / NSEC_PER_USEC;
60 bfd_time_now_nsec (vlib_main_t * vm, f64 * vm_time)
62 f64 _vm_time = vlib_time_now (vm);
65 return _vm_time * NSEC_PER_SEC;
68 static vlib_node_registration_t bfd_process_node;
71 format_bfd_auth_key (u8 * s, va_list * args)
73 const bfd_auth_key_t *key = va_arg (*args, bfd_auth_key_t *);
76 s = format (s, "{auth-type=%u:%s, conf-key-id=%u, use-count=%u}, ",
77 key->auth_type, bfd_auth_type_str (key->auth_type),
78 key->conf_key_id, key->use_count);
82 s = format (s, "{none}");
88 * We actually send all bfd pkts to the "error" node after scanning
89 * them, so the graph node has only one next-index. The "error-drop"
90 * node automatically bumps our per-node packet counters for us.
94 BFD_INPUT_NEXT_NORMAL,
98 static void bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now,
102 bfd_set_defaults (bfd_main_t * bm, bfd_session_t * bs)
104 bs->local_state = BFD_STATE_down;
105 bs->local_diag = BFD_DIAG_CODE_no_diag;
106 bs->remote_state = BFD_STATE_down;
107 bs->remote_discr = 0;
108 bs->hop_type = BFD_HOP_TYPE_SINGLE;
109 bs->config_desired_min_tx_usec = BFD_DEFAULT_DESIRED_MIN_TX_USEC;
110 bs->config_desired_min_tx_nsec = bm->default_desired_min_tx_nsec;
111 bs->effective_desired_min_tx_nsec = bm->default_desired_min_tx_nsec;
112 bs->remote_min_rx_usec = 1;
113 bs->remote_min_rx_nsec = bfd_usec_to_nsec (bs->remote_min_rx_usec);
114 bs->remote_min_echo_rx_usec = 0;
115 bs->remote_min_echo_rx_nsec = 0;
116 bs->remote_demand = 0;
117 bs->auth.remote_seq_number = 0;
118 bs->auth.remote_seq_number_known = 0;
119 bs->auth.local_seq_number = random_u32 (&bm->random_seed);
120 bs->echo_secret = random_u32 (&bm->random_seed);
124 bfd_set_diag (bfd_session_t * bs, bfd_diag_code_e code)
126 if (bs->local_diag != code)
128 BFD_DBG ("set local_diag, bs_idx=%d: '%d:%s'", bs->bs_idx, code,
129 bfd_diag_code_string (code));
130 bs->local_diag = code;
135 bfd_set_state (vlib_main_t * vm, bfd_main_t * bm, bfd_session_t * bs,
136 bfd_state_e new_state, int handling_wakeup)
138 if (bs->local_state != new_state)
140 BFD_DBG ("Change state, bs_idx=%d: %s->%s", bs->bs_idx,
141 bfd_state_string (bs->local_state),
142 bfd_state_string (new_state));
143 bs->local_state = new_state;
144 bfd_on_state_change (bm, bs, bfd_time_now_nsec (vm, NULL),
150 bfd_poll_state_string (bfd_poll_state_e state)
156 return "BFD_POLL_" #x;
157 foreach_bfd_poll_state (F)
164 bfd_set_poll_state (bfd_session_t * bs, bfd_poll_state_e state)
166 if (bs->poll_state != state)
168 BFD_DBG ("Setting poll state=%s, bs_idx=%u",
169 bfd_poll_state_string (state), bs->bs_idx);
170 bs->poll_state = state;
175 bfd_recalc_tx_interval (bfd_session_t *bs)
177 bs->transmit_interval_nsec =
178 clib_max (bs->effective_desired_min_tx_nsec, bs->remote_min_rx_nsec);
179 BFD_DBG ("Recalculated transmit interval " BFD_CLK_FMT,
180 BFD_CLK_PRN (bs->transmit_interval_nsec));
184 bfd_recalc_echo_tx_interval (bfd_session_t *bs)
186 bs->echo_transmit_interval_nsec =
187 clib_max (bs->effective_desired_min_tx_nsec, bs->remote_min_echo_rx_nsec);
188 BFD_DBG ("Recalculated echo transmit interval " BFD_CLK_FMT,
189 BFD_CLK_PRN (bs->echo_transmit_interval_nsec));
193 bfd_calc_next_tx (bfd_main_t * bm, bfd_session_t * bs, u64 now)
195 if (bs->local_detect_mult > 1)
197 /* common case - 75-100% of transmit interval */
198 bs->tx_timeout_nsec = bs->last_tx_nsec +
199 (1 - .25 * (random_f64 (&bm->random_seed))) *
200 bs->transmit_interval_nsec;
201 if (bs->tx_timeout_nsec < now)
204 * the timeout is in the past, which means that either remote
205 * demand mode was set or performance/clock issues ...
207 BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
208 "tx_timeout is %lu)",
209 (now - bs->tx_timeout_nsec) /
210 bs->transmit_interval_nsec, now, bs->tx_timeout_nsec);
211 bs->tx_timeout_nsec = now;
216 /* special case - 75-90% of transmit interval */
217 bs->tx_timeout_nsec = bs->last_tx_nsec +
218 (.9 - .15 * (random_f64 (&bm->random_seed))) *
219 bs->transmit_interval_nsec;
220 if (bs->tx_timeout_nsec < now)
223 * the timeout is in the past, which means that either remote
224 * demand mode was set or performance/clock issues ...
226 BFD_DBG ("Missed %lu transmit events (now is %lu, calc "
227 "tx_timeout is %lu)",
228 (now - bs->tx_timeout_nsec) /
229 bs->transmit_interval_nsec, now, bs->tx_timeout_nsec);
230 bs->tx_timeout_nsec = now;
233 if (bs->tx_timeout_nsec)
235 BFD_DBG ("Next transmit in %lu nsec/%.02fs@%lu",
236 bs->tx_timeout_nsec - now,
237 (bs->tx_timeout_nsec - now) * SEC_PER_NSEC,
238 bs->tx_timeout_nsec);
243 bfd_calc_next_echo_tx (bfd_session_t *bs, u64 now)
245 bs->echo_tx_timeout_nsec =
246 bs->echo_last_tx_nsec + bs->echo_transmit_interval_nsec;
247 if (bs->echo_tx_timeout_nsec < now)
249 /* huh, we've missed it already, transmit now */
250 BFD_DBG ("Missed %lu echo transmit events (now is %lu, calc tx_timeout "
252 (now - bs->echo_tx_timeout_nsec) /
253 bs->echo_transmit_interval_nsec,
254 now, bs->echo_tx_timeout_nsec);
255 bs->echo_tx_timeout_nsec = now;
257 BFD_DBG ("Next echo transmit in %lu nsec/%.02fs@%lu",
258 bs->echo_tx_timeout_nsec - now,
259 (bs->echo_tx_timeout_nsec - now) * SEC_PER_NSEC,
260 bs->echo_tx_timeout_nsec);
264 bfd_recalc_detection_time (bfd_session_t *bs)
266 if (bs->local_state == BFD_STATE_init || bs->local_state == BFD_STATE_up)
268 bs->detection_time_nsec =
269 bs->remote_detect_mult *
270 clib_max (bs->effective_required_min_rx_nsec,
271 bs->remote_desired_min_tx_nsec);
272 BFD_DBG ("Recalculated detection time %lu nsec/%.3fs",
273 bs->detection_time_nsec,
274 bs->detection_time_nsec * SEC_PER_NSEC);
279 bfd_set_timer (bfd_main_t * bm, bfd_session_t * bs, u64 now,
285 if (BFD_STATE_up == bs->local_state)
287 rx_timeout = bs->last_rx_nsec + bs->detection_time_nsec;
289 if (BFD_STATE_up != bs->local_state ||
290 (!bs->remote_demand && bs->remote_min_rx_usec) ||
291 BFD_POLL_NOT_NEEDED != bs->poll_state)
293 tx_timeout = bs->tx_timeout_nsec;
295 if (tx_timeout && rx_timeout)
297 next = clib_min (tx_timeout, rx_timeout);
307 if (bs->echo && next > bs->echo_tx_timeout_nsec)
309 next = bs->echo_tx_timeout_nsec;
311 BFD_DBG ("bs_idx=%u, tx_timeout=%lu, echo_tx_timeout=%lu, rx_timeout=%lu, "
313 bs->bs_idx, tx_timeout, bs->echo_tx_timeout_nsec, rx_timeout,
315 ? "tx" : (next == bs->echo_tx_timeout_nsec ? "echo tx" : "rx"));
319 bs->event_time_nsec = next;
320 /* add extra tick if it's not even */
321 u32 wheel_time_ticks =
322 (bs->event_time_nsec - now) / bm->nsec_per_tw_tick +
323 ((bs->event_time_nsec - now) % bm->nsec_per_tw_tick != 0);
324 BFD_DBG ("event_time_nsec %lu (%lu nsec/%.3fs in future) -> "
325 "wheel_time_ticks %u", bs->event_time_nsec,
326 bs->event_time_nsec - now,
327 (bs->event_time_nsec - now) * SEC_PER_NSEC, wheel_time_ticks);
328 wheel_time_ticks = wheel_time_ticks ? wheel_time_ticks : 1;
332 TW (tw_timer_update) (&bm->wheel, bs->tw_id, wheel_time_ticks);
333 BFD_DBG ("tw_timer_update(%p, %u, %lu);", &bm->wheel, bs->tw_id,
339 TW (tw_timer_start) (&bm->wheel, bs->bs_idx, 0, wheel_time_ticks);
340 BFD_DBG ("tw_timer_start(%p, %u, 0, %lu) == %u;", &bm->wheel,
341 bs->bs_idx, wheel_time_ticks);
344 if (!handling_wakeup)
347 /* Send only if it is earlier than current awaited wakeup time */
349 (bs->event_time_nsec < bm->bfd_process_next_wakeup_nsec) &&
351 * If the wake-up time is within 2x the delay of the event propagation delay,
352 * avoid the expense of sending the event. The 2x multiplier is to workaround the race whereby
353 * simultaneous event + expired timer create one recurring bogus wakeup/suspend instance,
354 * due to double scheduling of the node on the pending list.
356 (bm->bfd_process_next_wakeup_nsec - bs->event_time_nsec >
357 2 * bm->bfd_process_wakeup_event_delay_nsec) &&
358 /* Must be no events in flight to send an event */
359 (!bm->bfd_process_wakeup_events_in_flight);
361 /* If we do send the signal, note this down along with the start timestamp */
364 bm->bfd_process_wakeup_events_in_flight++;
365 bm->bfd_process_wakeup_event_start_nsec = now;
370 /* Use the multithreaded event sending so the workers can send events too */
373 vlib_process_signal_event_mt (bm->vlib_main,
374 bm->bfd_process_node_index,
375 BFD_EVENT_RESCHEDULE, ~0);
381 bfd_set_effective_desired_min_tx (bfd_main_t * bm,
382 bfd_session_t * bs, u64 now,
383 u64 desired_min_tx_nsec)
385 bs->effective_desired_min_tx_nsec = desired_min_tx_nsec;
386 BFD_DBG ("Set effective desired min tx to " BFD_CLK_FMT,
387 BFD_CLK_PRN (bs->effective_desired_min_tx_nsec));
388 bfd_recalc_detection_time (bs);
389 bfd_recalc_tx_interval (bs);
390 bfd_recalc_echo_tx_interval (bs);
391 bfd_calc_next_tx (bm, bs, now);
395 bfd_set_effective_required_min_rx (bfd_session_t *bs, u64 required_min_rx_nsec)
397 bs->effective_required_min_rx_nsec = required_min_rx_nsec;
398 BFD_DBG ("Set effective required min rx to " BFD_CLK_FMT,
399 BFD_CLK_PRN (bs->effective_required_min_rx_nsec));
400 bfd_recalc_detection_time (bs);
404 bfd_set_remote_required_min_rx (bfd_session_t *bs,
405 u32 remote_required_min_rx_usec)
407 if (bs->remote_min_rx_usec != remote_required_min_rx_usec)
409 bs->remote_min_rx_usec = remote_required_min_rx_usec;
410 bs->remote_min_rx_nsec = bfd_usec_to_nsec (remote_required_min_rx_usec);
411 BFD_DBG ("Set remote min rx to " BFD_CLK_FMT,
412 BFD_CLK_PRN (bs->remote_min_rx_nsec));
413 bfd_recalc_detection_time (bs);
414 bfd_recalc_tx_interval (bs);
419 bfd_set_remote_required_min_echo_rx (bfd_session_t *bs,
420 u32 remote_required_min_echo_rx_usec)
422 if (bs->remote_min_echo_rx_usec != remote_required_min_echo_rx_usec)
424 bs->remote_min_echo_rx_usec = remote_required_min_echo_rx_usec;
425 bs->remote_min_echo_rx_nsec =
426 bfd_usec_to_nsec (bs->remote_min_echo_rx_usec);
427 BFD_DBG ("Set remote min echo rx to " BFD_CLK_FMT,
428 BFD_CLK_PRN (bs->remote_min_echo_rx_nsec));
429 bfd_recalc_echo_tx_interval (bs);
434 bfd_notify_listeners (bfd_main_t * bm,
435 bfd_listen_event_e event, const bfd_session_t * bs)
438 vec_foreach (fn, bm->listeners)
445 bfd_session_start (bfd_main_t * bm, bfd_session_t * bs)
447 BFD_DBG ("\nStarting session: %U", format_bfd_session, bs);
448 vlib_log_info (bm->log_class, "start BFD session: %U",
449 format_bfd_session_brief, bs);
450 bfd_set_effective_required_min_rx (bs, bs->config_required_min_rx_nsec);
451 bfd_recalc_tx_interval (bs);
452 vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index,
453 BFD_EVENT_NEW_SESSION, bs->bs_idx);
454 bfd_notify_listeners (bm, BFD_LISTEN_EVENT_CREATE, bs);
458 bfd_session_set_flags (vlib_main_t * vm, bfd_session_t * bs, u8 admin_up_down)
460 bfd_main_t *bm = &bfd_main;
461 u64 now = bfd_time_now_nsec (vm, NULL);
464 BFD_DBG ("Session set admin-up, bs-idx=%u", bs->bs_idx);
465 vlib_log_info (bm->log_class, "set session admin-up: %U",
466 format_bfd_session_brief, bs);
467 bfd_set_state (vm, bm, bs, BFD_STATE_down, 0);
468 bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
469 bfd_calc_next_tx (bm, bs, now);
470 bfd_set_timer (bm, bs, now, 0);
474 BFD_DBG ("Session set admin-down, bs-idx=%u", bs->bs_idx);
475 vlib_log_info (bm->log_class, "set session admin-down: %U",
476 format_bfd_session_brief, bs);
477 bfd_set_diag (bs, BFD_DIAG_CODE_admin_down);
478 bfd_set_state (vm, bm, bs, BFD_STATE_admin_down, 0);
479 bfd_calc_next_tx (bm, bs, now);
480 bfd_set_timer (bm, bs, now, 0);
485 bfd_input_format_trace (u8 * s, va_list * args)
487 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
488 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
489 const bfd_input_trace_t *t = va_arg (*args, bfd_input_trace_t *);
490 const bfd_pkt_t *pkt = (bfd_pkt_t *) t->data;
491 if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head))
493 s = format (s, "BFD v%u, diag=%u(%s), state=%u(%s),\n"
494 " flags=(P:%u, F:%u, C:%u, A:%u, D:%u, M:%u), "
495 "detect_mult=%u, length=%u\n",
496 bfd_pkt_get_version (pkt), bfd_pkt_get_diag_code (pkt),
497 bfd_diag_code_string (bfd_pkt_get_diag_code (pkt)),
498 bfd_pkt_get_state (pkt),
499 bfd_state_string (bfd_pkt_get_state (pkt)),
500 bfd_pkt_get_poll (pkt), bfd_pkt_get_final (pkt),
501 bfd_pkt_get_control_plane_independent (pkt),
502 bfd_pkt_get_auth_present (pkt), bfd_pkt_get_demand (pkt),
503 bfd_pkt_get_multipoint (pkt), pkt->head.detect_mult,
505 if (t->len >= sizeof (bfd_pkt_t) &&
506 pkt->head.length >= sizeof (bfd_pkt_t))
508 s = format (s, " my discriminator: %u\n",
509 clib_net_to_host_u32 (pkt->my_disc));
510 s = format (s, " your discriminator: %u\n",
511 clib_net_to_host_u32 (pkt->your_disc));
512 s = format (s, " desired min tx interval: %u\n",
513 clib_net_to_host_u32 (pkt->des_min_tx));
514 s = format (s, " required min rx interval: %u\n",
515 clib_net_to_host_u32 (pkt->req_min_rx));
516 s = format (s, " required min echo rx interval: %u",
517 clib_net_to_host_u32 (pkt->req_min_echo_rx));
519 if (t->len >= sizeof (bfd_pkt_with_common_auth_t) &&
520 pkt->head.length >= sizeof (bfd_pkt_with_common_auth_t) &&
521 bfd_pkt_get_auth_present (pkt))
523 const bfd_pkt_with_common_auth_t *with_auth = (void *) pkt;
524 const bfd_auth_common_t *common = &with_auth->common_auth;
525 s = format (s, "\n auth len: %u\n", common->len);
526 s = format (s, " auth type: %u:%s\n", common->type,
527 bfd_auth_type_str (common->type));
528 if (t->len >= sizeof (bfd_pkt_with_sha1_auth_t) &&
529 pkt->head.length >= sizeof (bfd_pkt_with_sha1_auth_t) &&
530 (BFD_AUTH_TYPE_keyed_sha1 == common->type ||
531 BFD_AUTH_TYPE_meticulous_keyed_sha1 == common->type))
533 const bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt;
534 const bfd_auth_sha1_t *sha1 = &with_sha1->sha1_auth;
535 s = format (s, " seq num: %u\n",
536 clib_net_to_host_u32 (sha1->seq_num));
537 s = format (s, " key id: %u\n", sha1->key_id);
538 s = format (s, " hash: %U", format_hex_bytes, sha1->hash,
539 sizeof (sha1->hash));
544 s = format (s, "\n");
557 bfd_rpc_event_cb (const bfd_rpc_event_t * a)
559 bfd_main_t *bm = &bfd_main;
560 u32 bs_idx = a->bs_idx;
562 bfd_session_t session_data;
565 if (!pool_is_free_index (bm->sessions, bs_idx))
567 bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
568 clib_memcpy (&session_data, bs, sizeof (bfd_session_t));
573 BFD_DBG ("Ignoring event RPC for non-existent session index %u",
579 bfd_event (bm, &session_data);
583 bfd_event_rpc (u32 bs_idx)
585 const u32 data_size = sizeof (bfd_rpc_event_t);
587 bfd_rpc_event_t *event = (bfd_rpc_event_t *) data;
589 event->bs_idx = bs_idx;
590 vl_api_rpc_call_main_thread (bfd_rpc_event_cb, data, data_size);
596 } bfd_rpc_notify_listeners_t;
599 bfd_rpc_notify_listeners_cb (const bfd_rpc_notify_listeners_t * a)
601 bfd_main_t *bm = &bfd_main;
602 u32 bs_idx = a->bs_idx;
604 if (!pool_is_free_index (bm->sessions, bs_idx))
606 bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
607 bfd_notify_listeners (bm, BFD_LISTEN_EVENT_UPDATE, bs);
611 BFD_DBG ("Ignoring notify RPC for non-existent session index %u",
618 bfd_notify_listeners_rpc (u32 bs_idx)
620 const u32 data_size = sizeof (bfd_rpc_notify_listeners_t);
622 bfd_rpc_notify_listeners_t *notify = (bfd_rpc_notify_listeners_t *) data;
623 notify->bs_idx = bs_idx;
624 vl_api_rpc_call_main_thread (bfd_rpc_notify_listeners_cb, data, data_size);
628 bfd_on_state_change (bfd_main_t * bm, bfd_session_t * bs, u64 now,
631 BFD_DBG ("\nState changed: %U", format_bfd_session, bs);
633 if (vlib_get_thread_index () == 0)
639 /* without RPC - a REGRESSION: BFD event are not propagated */
640 bfd_event_rpc (bs->bs_idx);
643 switch (bs->local_state)
645 case BFD_STATE_admin_down:
647 bfd_set_effective_desired_min_tx (bm, bs, now,
649 (bs->config_desired_min_tx_nsec,
650 bm->default_desired_min_tx_nsec));
651 bfd_set_effective_required_min_rx (bs, bs->config_required_min_rx_nsec);
652 bfd_set_timer (bm, bs, now, handling_wakeup);
656 bfd_set_effective_desired_min_tx (bm, bs, now,
658 (bs->config_desired_min_tx_nsec,
659 bm->default_desired_min_tx_nsec));
660 bfd_set_effective_required_min_rx (bs, bs->config_required_min_rx_nsec);
661 bfd_set_timer (bm, bs, now, handling_wakeup);
665 bfd_set_effective_desired_min_tx (bm, bs, now,
666 bs->config_desired_min_tx_nsec);
667 bfd_set_timer (bm, bs, now, handling_wakeup);
670 bfd_set_effective_desired_min_tx (bm, bs, now,
671 bs->config_desired_min_tx_nsec);
672 if (BFD_POLL_NOT_NEEDED == bs->poll_state)
674 bfd_set_effective_required_min_rx (bs,
675 bs->config_required_min_rx_nsec);
677 bfd_set_timer (bm, bs, now, handling_wakeup);
680 if (vlib_get_thread_index () == 0)
682 bfd_notify_listeners (bm, BFD_LISTEN_EVENT_UPDATE, bs);
686 /* without RPC - a REGRESSION: state changes are not propagated */
687 bfd_notify_listeners_rpc (bs->bs_idx);
692 bfd_on_config_change (bfd_main_t *bm, bfd_session_t *bs, u64 now)
695 * if remote demand mode is set and we need to do a poll, set the next
696 * timeout so that the session wakes up immediately
698 if (bs->remote_demand && BFD_POLL_NEEDED == bs->poll_state &&
699 bs->poll_state_start_or_timeout_nsec < now)
701 bs->tx_timeout_nsec = now;
703 bfd_recalc_detection_time (bs);
704 bfd_set_timer (bm, bs, now, 0);
708 bfd_add_transport_layer (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
710 switch (bs->transport)
712 case BFD_TRANSPORT_UDP4:
713 BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx);
714 bfd_add_udp4_transport (vm, bi, bs, 0 /* is_echo */ );
716 case BFD_TRANSPORT_UDP6:
717 BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx);
718 bfd_add_udp6_transport (vm, bi, bs, 0 /* is_echo */ );
724 bfd_transport_control_frame (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
726 switch (bs->transport)
728 case BFD_TRANSPORT_UDP4:
729 BFD_DBG ("Transport bfd via udp4, bs_idx=%u", bs->bs_idx);
730 return bfd_transport_udp4 (vm, bi, bs);
732 case BFD_TRANSPORT_UDP6:
733 BFD_DBG ("Transport bfd via udp6, bs_idx=%u", bs->bs_idx);
734 return bfd_transport_udp6 (vm, bi, bs);
741 bfd_echo_add_transport_layer (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
743 switch (bs->transport)
745 case BFD_TRANSPORT_UDP4:
746 BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx);
747 return bfd_add_udp4_transport (vm, bi, bs, 1 /* is_echo */ );
749 case BFD_TRANSPORT_UDP6:
750 BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx);
751 return bfd_add_udp6_transport (vm, bi, bs, 1 /* is_echo */ );
758 bfd_transport_echo (vlib_main_t * vm, u32 bi, bfd_session_t * bs)
760 switch (bs->transport)
762 case BFD_TRANSPORT_UDP4:
763 BFD_DBG ("Transport bfd echo via udp4, bs_idx=%u", bs->bs_idx);
764 return bfd_transport_udp4 (vm, bi, bs);
766 case BFD_TRANSPORT_UDP6:
767 BFD_DBG ("Transport bfd echo via udp6, bs_idx=%u", bs->bs_idx);
768 return bfd_transport_udp6 (vm, bi, bs);
775 bfd_add_sha1_auth_section (vlib_main_t *vm, vlib_buffer_t *b,
778 bfd_pkt_with_sha1_auth_t *pkt = vlib_buffer_get_current (b);
779 bfd_auth_sha1_t *auth = &pkt->sha1_auth;
780 b->current_length += sizeof (*auth);
781 pkt->pkt.head.length += sizeof (*auth);
782 bfd_pkt_set_auth_present (&pkt->pkt);
783 clib_memset (auth, 0, sizeof (*auth));
784 auth->type_len.type = bs->auth.curr_key->auth_type;
786 * only meticulous authentication types require incrementing seq number
787 * for every message, but doing so doesn't violate the RFC
789 ++bs->auth.local_seq_number;
790 auth->type_len.len = sizeof (bfd_auth_sha1_t);
791 auth->key_id = bs->auth.curr_bfd_key_id;
792 auth->seq_num = clib_host_to_net_u32 (bs->auth.local_seq_number);
794 * first copy the password into the packet, then calculate the hash
795 * and finally replace the password with the calculated hash
797 clib_memcpy (auth->hash, bs->auth.curr_key->key,
798 sizeof (bs->auth.curr_key->key));
799 unsigned char hash[sizeof (auth->hash)];
802 vnet_crypto_op_init (&op, VNET_CRYPTO_OP_SHA1_HASH);
804 op.len = sizeof (*pkt);
806 vnet_crypto_process_ops (vm, &op, 1);
807 BFD_DBG ("hashing: %U", format_hex_bytes, pkt, sizeof (*pkt));
808 clib_memcpy (auth->hash, hash, sizeof (hash));
812 bfd_add_auth_section (vlib_main_t *vm, vlib_buffer_t *b, bfd_session_t *bs)
814 bfd_main_t *bm = &bfd_main;
815 if (bs->auth.curr_key)
817 const bfd_auth_type_e auth_type = bs->auth.curr_key->auth_type;
820 case BFD_AUTH_TYPE_reserved:
822 case BFD_AUTH_TYPE_simple_password:
824 case BFD_AUTH_TYPE_keyed_md5:
826 case BFD_AUTH_TYPE_meticulous_keyed_md5:
827 vlib_log_crit (bm->log_class,
828 "internal error, unexpected BFD auth type '%d'",
831 case BFD_AUTH_TYPE_keyed_sha1:
833 case BFD_AUTH_TYPE_meticulous_keyed_sha1:
834 bfd_add_sha1_auth_section (vm, b, bs);
841 bfd_is_echo_possible (bfd_session_t * bs)
843 if (BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state &&
844 bs->remote_min_echo_rx_usec > 0)
846 switch (bs->transport)
848 case BFD_TRANSPORT_UDP4:
849 return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP4);
850 case BFD_TRANSPORT_UDP6:
851 return bfd_udp_is_echo_available (BFD_TRANSPORT_UDP6);
858 bfd_init_control_frame (bfd_session_t *bs, vlib_buffer_t *b)
860 bfd_pkt_t *pkt = vlib_buffer_get_current (b);
862 bfd_length = sizeof (bfd_pkt_t);
863 clib_memset (pkt, 0, sizeof (*pkt));
864 bfd_pkt_set_version (pkt, 1);
865 bfd_pkt_set_diag_code (pkt, bs->local_diag);
866 bfd_pkt_set_state (pkt, bs->local_state);
867 pkt->head.detect_mult = bs->local_detect_mult;
868 pkt->head.length = bfd_length;
869 pkt->my_disc = bs->local_discr;
870 pkt->your_disc = bs->remote_discr;
871 pkt->des_min_tx = clib_host_to_net_u32 (bs->config_desired_min_tx_usec);
875 clib_host_to_net_u32 (bfd_nsec_to_usec
876 (bs->effective_required_min_rx_nsec));
881 clib_host_to_net_u32 (bs->config_required_min_rx_usec);
883 pkt->req_min_echo_rx = clib_host_to_net_u32 (1);
884 b->current_length = bfd_length;
888 bfd_send_echo (vlib_main_t *vm, bfd_main_t *bm, bfd_session_t *bs, u64 now)
890 if (!bfd_is_echo_possible (bs))
892 BFD_DBG ("\nSwitching off echo function: %U", format_bfd_session, bs);
896 if (now >= bs->echo_tx_timeout_nsec)
898 BFD_DBG ("\nSending echo packet: %U", format_bfd_session, bs);
900 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
902 vlib_log_crit (bm->log_class, "buffer allocation failure");
905 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
906 ASSERT (b->current_data == 0);
907 bfd_echo_pkt_t *pkt = vlib_buffer_get_current (b);
908 clib_memset (pkt, 0, sizeof (*pkt));
909 pkt->discriminator = bs->local_discr;
910 pkt->expire_time_nsec =
911 now + bs->echo_transmit_interval_nsec * bs->local_detect_mult;
913 bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_nsec,
915 b->current_length = sizeof (*pkt);
916 if (!bfd_echo_add_transport_layer (vm, bi, bs))
918 BFD_ERR ("cannot send echo packet out, turning echo off");
920 vlib_buffer_free_one (vm, bi);
923 if (!bfd_transport_echo (vm, bi, bs))
925 BFD_ERR ("cannot send echo packet out, turning echo off");
927 vlib_buffer_free_one (vm, bi);
930 bs->echo_last_tx_nsec = now;
931 bfd_calc_next_echo_tx (bs, now);
936 ("No need to send echo packet now, now is %lu, tx_timeout is %lu",
937 now, bs->echo_tx_timeout_nsec);
942 bfd_send_periodic (vlib_main_t *vm, bfd_main_t *bm, bfd_session_t *bs, u64 now)
944 if (!bs->remote_min_rx_usec && BFD_POLL_NOT_NEEDED == bs->poll_state)
946 BFD_DBG ("Remote min rx interval is zero, not sending periodic control "
950 if (BFD_POLL_NOT_NEEDED == bs->poll_state && bs->remote_demand &&
951 BFD_STATE_up == bs->local_state && BFD_STATE_up == bs->remote_state)
954 * A system MUST NOT periodically transmit BFD Control packets if Demand
955 * mode is active on the remote system (bfd.RemoteDemandMode is 1,
956 * bfd.SessionState is Up, and bfd.RemoteSessionState is Up) and a Poll
957 * Sequence is not being transmitted.
959 BFD_DBG ("Remote demand is set, not sending periodic control frame");
962 if (now >= bs->tx_timeout_nsec)
964 BFD_DBG ("\nSending periodic control frame: %U", format_bfd_session,
967 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
969 vlib_log_crit (bm->log_class, "buffer allocation failure");
972 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
973 ASSERT (b->current_data == 0);
974 bfd_init_control_frame (bs, b);
975 switch (bs->poll_state)
977 case BFD_POLL_NEEDED:
978 if (now < bs->poll_state_start_or_timeout_nsec)
980 BFD_DBG ("Cannot start a poll sequence yet, need to wait for "
982 BFD_CLK_PRN (bs->poll_state_start_or_timeout_nsec -
986 bs->poll_state_start_or_timeout_nsec = now;
987 bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS);
989 case BFD_POLL_IN_PROGRESS:
990 case BFD_POLL_IN_PROGRESS_AND_QUEUED:
991 bfd_pkt_set_poll (vlib_buffer_get_current (b));
992 BFD_DBG ("Setting poll bit in packet, bs_idx=%u", bs->bs_idx);
994 case BFD_POLL_NOT_NEEDED:
998 bfd_add_auth_section (vm, b, bs);
999 bfd_add_transport_layer (vm, bi, bs);
1000 if (!bfd_transport_control_frame (vm, bi, bs))
1002 vlib_buffer_free_one (vm, bi);
1004 bs->last_tx_nsec = now;
1005 bfd_calc_next_tx (bm, bs, now);
1010 ("No need to send control frame now, now is %lu, tx_timeout is %lu",
1011 now, bs->tx_timeout_nsec);
1016 bfd_init_final_control_frame (vlib_main_t *vm, vlib_buffer_t *b,
1019 BFD_DBG ("Send final control frame for bs_idx=%lu", bs->bs_idx);
1020 bfd_init_control_frame (bs, b);
1021 bfd_pkt_set_final (vlib_buffer_get_current (b));
1022 bfd_add_auth_section (vm, b, bs);
1023 u32 bi = vlib_get_buffer_index (vm, b);
1024 bfd_add_transport_layer (vm, bi, bs);
1025 bs->last_tx_nsec = bfd_time_now_nsec (vm, NULL);
1027 * RFC allows to include changes in final frame, so if there were any
1028 * pending, we already did that, thus we can clear any pending poll needs
1030 bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED);
1034 bfd_check_rx_timeout (vlib_main_t * vm, bfd_main_t * bm, bfd_session_t * bs,
1035 u64 now, int handling_wakeup)
1037 if (bs->last_rx_nsec + bs->detection_time_nsec <= now)
1039 BFD_DBG ("Rx timeout, session goes down");
1041 * RFC 5880 6.8.1. State Variables
1045 * The remote discriminator for this BFD session. This is the
1046 * discriminator chosen by the remote system, and is totally opaque
1047 * to the local system. This MUST be initialized to zero. If a
1048 * period of a Detection Time passes without the receipt of a valid,
1049 * authenticated BFD packet from the remote system, this variable
1050 * MUST be set to zero.
1052 bs->remote_discr = 0;
1053 bfd_set_diag (bs, BFD_DIAG_CODE_det_time_exp);
1054 bfd_set_state (vm, bm, bs, BFD_STATE_down, handling_wakeup);
1056 * If the remote system does not receive any
1057 * BFD Control packets for a Detection Time, it SHOULD reset
1058 * bfd.RemoteMinRxInterval to its initial value of 1 (per section 6.8.1,
1059 * since it is no longer required to maintain previous session state)
1060 * and then can transmit at its own rate.
1062 bfd_set_remote_required_min_rx (bs, 1);
1065 && bs->echo_last_rx_nsec +
1066 bs->echo_transmit_interval_nsec * bs->local_detect_mult <= now)
1068 BFD_DBG ("Echo rx timeout, session goes down");
1069 bfd_set_diag (bs, BFD_DIAG_CODE_echo_failed);
1070 bfd_set_state (vm, bm, bs, BFD_STATE_down, handling_wakeup);
1075 bfd_on_timeout (vlib_main_t *vm, bfd_main_t *bm, bfd_session_t *bs, u64 now)
1077 BFD_DBG ("Timeout for bs_idx=%lu", bs->bs_idx);
1078 switch (bs->local_state)
1080 case BFD_STATE_admin_down:
1082 case BFD_STATE_down:
1083 bfd_send_periodic (vm, bm, bs, now);
1085 case BFD_STATE_init:
1086 bfd_check_rx_timeout (vm, bm, bs, now, 1);
1087 bfd_send_periodic (vm, bm, bs, now);
1090 bfd_check_rx_timeout (vm, bm, bs, now, 1);
1091 if (BFD_POLL_NOT_NEEDED == bs->poll_state && !bs->echo &&
1092 bfd_is_echo_possible (bs))
1094 /* switch on echo function as main detection method now */
1095 BFD_DBG ("Switching on echo function, bs_idx=%u", bs->bs_idx);
1097 bs->echo_last_rx_nsec = now;
1098 bs->echo_tx_timeout_nsec = now;
1099 bfd_set_effective_required_min_rx (
1100 bs, clib_max (bm->min_required_min_rx_while_echo_nsec,
1101 bs->config_required_min_rx_nsec));
1102 bfd_set_poll_state (bs, BFD_POLL_NEEDED);
1104 bfd_send_periodic (vm, bm, bs, now);
1107 bfd_send_echo (vm, bm, bs, now);
1114 * bfd process node function
1117 bfd_process (vlib_main_t *vm, CLIB_UNUSED (vlib_node_runtime_t *rt),
1118 CLIB_UNUSED (vlib_frame_t *f))
1120 bfd_main_t *bm = &bfd_main;
1122 uword event_type, *event_data = 0;
1124 /* So we can send events to the bfd process */
1125 bm->bfd_process_node_index = bfd_process_node.index;
1130 u64 now = bfd_time_now_nsec (vm, &vm_time);
1131 BFD_DBG ("wakeup, now is %llunsec, vlib_time_now() is %.9f", now,
1135 if (pool_elts (bm->sessions))
1137 u32 first_expires_in_ticks =
1138 TW (tw_timer_first_expires_in_ticks) (&bm->wheel);
1139 if (!first_expires_in_ticks)
1142 ("tw_timer_first_expires_in_ticks(%p) returns 0ticks",
1144 timeout = bm->wheel.next_run_time - vm_time;
1145 BFD_DBG ("wheel.next_run_time is %.9f",
1146 bm->wheel.next_run_time);
1147 u64 next_expire_nsec = now + timeout * SEC_PER_NSEC;
1148 bm->bfd_process_next_wakeup_nsec = next_expire_nsec;
1153 BFD_DBG ("tw_timer_first_expires_in_ticks(%p) returns %luticks",
1154 &bm->wheel, first_expires_in_ticks);
1155 u64 next_expire_nsec =
1156 now + first_expires_in_ticks * bm->nsec_per_tw_tick;
1157 bm->bfd_process_next_wakeup_nsec = next_expire_nsec;
1159 ASSERT (next_expire_nsec - now <= UINT32_MAX);
1160 // cast to u32 to avoid warning
1161 timeout = (u32) (next_expire_nsec - now) * SEC_PER_NSEC;
1163 BFD_DBG ("vlib_process_wait_for_event_or_clock(vm, %.09f)",
1165 (void) vlib_process_wait_for_event_or_clock (vm, timeout);
1170 (void) vlib_process_wait_for_event (vm);
1172 event_type = vlib_process_get_events (vm, &event_data);
1173 now = bfd_time_now_nsec (vm, &vm_time);
1174 uword *session_index;
1177 case ~0: /* no events => timeout */
1178 /* nothing to do here */
1180 case BFD_EVENT_RESCHEDULE:
1181 BFD_DBG ("reschedule event");
1183 bm->bfd_process_wakeup_event_delay_nsec =
1184 now - bm->bfd_process_wakeup_event_start_nsec;
1185 bm->bfd_process_wakeup_events_in_flight--;
1187 /* nothing to do here - reschedule is done automatically after
1188 * each event or timeout */
1190 case BFD_EVENT_NEW_SESSION:
1191 vec_foreach (session_index, event_data)
1194 if (!pool_is_free_index (bm->sessions, *session_index))
1197 pool_elt_at_index (bm->sessions, *session_index);
1198 bfd_send_periodic (vm, bm, bs, now);
1199 bfd_set_timer (bm, bs, now, 1);
1203 BFD_DBG ("Ignoring event for non-existent session index %u",
1204 (u32) * session_index);
1209 case BFD_EVENT_CONFIG_CHANGED:
1210 vec_foreach (session_index, event_data)
1213 if (!pool_is_free_index (bm->sessions, *session_index))
1216 pool_elt_at_index (bm->sessions, *session_index);
1217 bfd_on_config_change (bm, bs, now);
1221 BFD_DBG ("Ignoring event for non-existent session index %u",
1222 (u32) * session_index);
1228 vlib_log_err (bm->log_class, "BUG: event type 0x%wx", event_type);
1231 BFD_DBG ("tw_timer_expire_timers_vec(%p, %.04f);", &bm->wheel, vm_time);
1234 TW (tw_timer_expire_timers_vec) (&bm->wheel, vm_time, expired);
1235 BFD_DBG ("Expired %d elements", vec_len (expired));
1237 vec_foreach (p, expired)
1239 const u32 bs_idx = *p;
1240 if (!pool_is_free_index (bm->sessions, bs_idx))
1242 bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
1243 bs->tw_id = 0; /* timer is gone because it expired */
1244 bfd_on_timeout (vm, bm, bs, now);
1245 bfd_set_timer (bm, bs, now, 1);
1251 _vec_len (expired) = 0;
1255 _vec_len (event_data) = 0;
1263 * bfd process node declaration
1265 VLIB_REGISTER_NODE (bfd_process_node, static) = {
1266 .function = bfd_process,
1267 .type = VLIB_NODE_TYPE_PROCESS,
1268 .name = "bfd-process",
1273 static clib_error_t *
1274 bfd_sw_interface_up_down (CLIB_UNUSED (vnet_main_t *vnm),
1275 CLIB_UNUSED (u32 sw_if_index), u32 flags)
1277 // bfd_main_t *bm = &bfd_main;
1278 // vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1279 if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1286 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (bfd_sw_interface_up_down);
1288 static clib_error_t *
1289 bfd_hw_interface_up_down (CLIB_UNUSED (vnet_main_t *vnm),
1290 CLIB_UNUSED (u32 hw_if_index), u32 flags)
1292 // bfd_main_t *bm = &bfd_main;
1293 if (flags & VNET_HW_INTERFACE_FLAG_LINK_UP)
1300 VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bfd_hw_interface_up_down);
1303 bfd_register_listener (bfd_notify_fn_t fn)
1305 bfd_main_t *bm = &bfd_main;
1307 vec_add1 (bm->listeners, fn);
1313 static clib_error_t *
1314 bfd_main_init (vlib_main_t * vm)
1316 vlib_thread_main_t *tm = &vlib_thread_main;
1317 u32 n_vlib_mains = tm->n_vlib_mains;
1319 setbuf (stdout, NULL);
1321 bfd_main_t *bm = &bfd_main;
1322 bm->random_seed = random_default_seed ();
1324 bm->vnet_main = vnet_get_main ();
1325 clib_memset (&bm->wheel, 0, sizeof (bm->wheel));
1326 bm->nsec_per_tw_tick = (f64) NSEC_PER_SEC / BFD_TW_TPS;
1327 bm->default_desired_min_tx_nsec =
1328 bfd_usec_to_nsec (BFD_DEFAULT_DESIRED_MIN_TX_USEC);
1329 bm->min_required_min_rx_while_echo_nsec =
1330 bfd_usec_to_nsec (BFD_REQUIRED_MIN_RX_USEC_WHILE_ECHO);
1331 BFD_DBG ("tw_timer_wheel_init(%p, %p, %.04f, %u)", &bm->wheel, NULL,
1332 1.00 / BFD_TW_TPS, ~0);
1333 TW (tw_timer_wheel_init) (&bm->wheel, NULL, 1.00 / BFD_TW_TPS, ~0);
1334 bm->log_class = vlib_log_register_class ("bfd", 0);
1335 vlib_log_debug (bm->log_class, "initialized");
1336 bm->owner_thread_index = ~0;
1337 if (n_vlib_mains > 1)
1338 clib_spinlock_init (&bm->lock);
1342 VLIB_INIT_FUNCTION (bfd_main_init);
1345 bfd_get_session (bfd_main_t * bm, bfd_transport_e t)
1347 bfd_session_t *result;
1351 pool_get (bm->sessions, result);
1352 clib_memset (result, 0, sizeof (*result));
1353 result->bs_idx = result - bm->sessions;
1354 result->transport = t;
1355 const unsigned limit = 1000;
1356 unsigned counter = 0;
1359 result->local_discr = random_u32 (&bm->random_seed);
1360 if (counter > limit)
1362 vlib_log_crit (bm->log_class,
1363 "couldn't allocate unused session discriminator even "
1364 "after %u tries!", limit);
1365 pool_put (bm->sessions, result);
1371 while (hash_get (bm->session_by_disc, result->local_discr));
1372 bfd_set_defaults (bm, result);
1373 hash_set (bm->session_by_disc, result->local_discr, result->bs_idx);
1379 bfd_put_session (bfd_main_t * bm, bfd_session_t * bs)
1383 vlib_log_info (bm->log_class, "delete session: %U",
1384 format_bfd_session_brief, bs);
1385 bfd_notify_listeners (bm, BFD_LISTEN_EVENT_DELETE, bs);
1386 if (bs->auth.curr_key)
1388 --bs->auth.curr_key->use_count;
1390 if (bs->auth.next_key)
1392 --bs->auth.next_key->use_count;
1394 hash_unset (bm->session_by_disc, bs->local_discr);
1395 pool_put (bm->sessions, bs);
1400 bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx)
1402 bfd_lock_check (bm);
1403 if (!pool_is_free_index (bm->sessions, bs_idx))
1405 return pool_elt_at_index (bm->sessions, bs_idx);
1411 bfd_find_session_by_disc (bfd_main_t * bm, u32 disc)
1413 bfd_lock_check (bm);
1414 uword *p = hash_get (bfd_main.session_by_disc, disc);
1417 return pool_elt_at_index (bfd_main.sessions, *p);
1423 * @brief verify bfd packet - common checks
1427 * @return 1 if bfd packet is valid
1430 bfd_verify_pkt_common (const bfd_pkt_t * pkt)
1432 if (1 != bfd_pkt_get_version (pkt))
1434 BFD_ERR ("BFD verification failed - unexpected version: '%d'",
1435 bfd_pkt_get_version (pkt));
1438 if (pkt->head.length < sizeof (bfd_pkt_t) ||
1439 (bfd_pkt_get_auth_present (pkt) &&
1440 pkt->head.length < sizeof (bfd_pkt_with_common_auth_t)))
1442 BFD_ERR ("BFD verification failed - unexpected length: '%d' (auth "
1444 pkt->head.length, bfd_pkt_get_auth_present (pkt));
1447 if (!pkt->head.detect_mult)
1449 BFD_ERR ("BFD verification failed - unexpected detect-mult: '%d'",
1450 pkt->head.detect_mult);
1453 if (bfd_pkt_get_multipoint (pkt))
1455 BFD_ERR ("BFD verification failed - unexpected multipoint: '%d'",
1456 bfd_pkt_get_multipoint (pkt));
1461 BFD_ERR ("BFD verification failed - unexpected my-disc: '%d'",
1465 if (!pkt->your_disc)
1467 const u8 pkt_state = bfd_pkt_get_state (pkt);
1468 if (pkt_state != BFD_STATE_down && pkt_state != BFD_STATE_admin_down)
1470 BFD_ERR ("BFD verification failed - unexpected state: '%s' "
1471 "(your-disc is zero)", bfd_state_string (pkt_state));
1479 bfd_session_switch_auth_to_next (bfd_session_t * bs)
1481 BFD_DBG ("Switching authentication key from %U to %U for bs_idx=%u",
1482 format_bfd_auth_key, bs->auth.curr_key, format_bfd_auth_key,
1483 bs->auth.next_key, bs->bs_idx);
1484 bs->auth.is_delayed = 0;
1485 if (bs->auth.curr_key)
1487 --bs->auth.curr_key->use_count;
1489 bs->auth.curr_key = bs->auth.next_key;
1490 bs->auth.next_key = NULL;
1491 bs->auth.curr_bfd_key_id = bs->auth.next_bfd_key_id;
1495 bfd_auth_type_is_meticulous (bfd_auth_type_e auth_type)
1497 if (BFD_AUTH_TYPE_meticulous_keyed_md5 == auth_type ||
1498 BFD_AUTH_TYPE_meticulous_keyed_sha1 == auth_type)
1506 bfd_verify_pkt_auth_seq_num (vlib_main_t * vm, bfd_session_t * bs,
1507 u32 received_seq_num, int is_meticulous)
1512 * This variable MUST be set to zero after no packets have been
1513 * received on this session for at least twice the Detection Time.
1515 u64 now = bfd_time_now_nsec (vm, NULL);
1516 if (now - bs->last_rx_nsec > bs->detection_time_nsec * 2)
1518 BFD_DBG ("BFD peer unresponsive for %lu nsec, which is > 2 * "
1519 "detection_time=%u nsec, resetting remote_seq_number_known "
1520 "flag", now - bs->last_rx_nsec, bs->detection_time_nsec * 2);
1521 bs->auth.remote_seq_number_known = 0;
1523 if (bs->auth.remote_seq_number_known)
1525 /* remote sequence number is known, verify its validity */
1526 const u32 max_u32 = 0xffffffff;
1527 /* the calculation might wrap, account for the special case... */
1528 if (bs->auth.remote_seq_number > max_u32 - 3 * bs->local_detect_mult)
1534 * |----------+----------------------------+-----------|
1536 * | remote_seq_num------+
1538 * +-----(remote_seq_num + 3*detect_mult) % * 0xffffffff
1540 * x + y + z = 0xffffffff
1541 * x + z = 3 * detect_mult
1543 const u32 z = max_u32 - bs->auth.remote_seq_number;
1544 const u32 x = 3 * bs->local_detect_mult - z;
1545 if (received_seq_num > x &&
1546 received_seq_num < bs->auth.remote_seq_number + is_meticulous)
1549 ("Recvd sequence number=%u out of ranges <0, %u>, <%u, %u>",
1550 received_seq_num, x,
1551 bs->auth.remote_seq_number + is_meticulous, max_u32);
1558 const u32 min = bs->auth.remote_seq_number + is_meticulous;
1560 bs->auth.remote_seq_number + 3 * bs->local_detect_mult;
1561 if (received_seq_num < min || received_seq_num > max)
1563 BFD_ERR ("Recvd sequence number=%u out of range <%u, %u>",
1564 received_seq_num, min, max);
1573 bfd_verify_pkt_auth_key_sha1 (vlib_main_t *vm, const bfd_pkt_t *pkt,
1574 u32 pkt_size, CLIB_UNUSED (bfd_session_t *bs),
1575 u8 bfd_key_id, bfd_auth_key_t *auth_key)
1577 ASSERT (auth_key->auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
1578 auth_key->auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1);
1580 bfd_pkt_with_common_auth_t *with_common = (void *) pkt;
1581 if (pkt_size < sizeof (*with_common))
1583 BFD_ERR ("Packet size too small to hold authentication common header");
1586 if (with_common->common_auth.type != auth_key->auth_type)
1588 BFD_ERR ("BFD auth type mismatch, packet auth=%d:%s doesn't match "
1589 "in-use auth=%d:%s",
1590 with_common->common_auth.type,
1591 bfd_auth_type_str (with_common->common_auth.type),
1592 auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
1595 bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt;
1596 if (pkt_size < sizeof (*with_sha1) ||
1597 with_sha1->sha1_auth.type_len.len < sizeof (with_sha1->sha1_auth))
1600 ("BFD size mismatch, payload size=%u, expected=%u, auth_len=%u, "
1601 "expected=%u", pkt_size, sizeof (*with_sha1),
1602 with_sha1->sha1_auth.type_len.len, sizeof (with_sha1->sha1_auth));
1605 if (with_sha1->sha1_auth.key_id != bfd_key_id)
1608 ("BFD key ID mismatch, packet key ID=%u doesn't match key ID=%u%s",
1609 with_sha1->sha1_auth.key_id, bfd_key_id,
1611 auth.is_delayed ? " (but a delayed auth change is scheduled)" : "");
1615 u8 hash_from_packet[STRUCT_SIZE_OF (bfd_auth_sha1_t, hash)];
1616 u8 calculated_hash[STRUCT_SIZE_OF (bfd_auth_sha1_t, hash)];
1617 clib_memcpy (hash_from_packet, with_sha1->sha1_auth.hash,
1618 sizeof (with_sha1->sha1_auth.hash));
1619 clib_memcpy (with_sha1->sha1_auth.hash, auth_key->key,
1620 sizeof (auth_key->key));
1621 vnet_crypto_op_t op;
1622 vnet_crypto_op_init (&op, VNET_CRYPTO_OP_SHA1_HASH);
1623 op.src = (u8 *) with_sha1;
1624 op.len = sizeof (*with_sha1);
1625 op.digest = calculated_hash;
1626 vnet_crypto_process_ops (vm, &op, 1);
1628 /* Restore the modified data within the packet */
1629 clib_memcpy (with_sha1->sha1_auth.hash, hash_from_packet,
1630 sizeof (with_sha1->sha1_auth.hash));
1633 memcmp (calculated_hash, hash_from_packet, sizeof (calculated_hash)))
1635 clib_memcpy (with_sha1->sha1_auth.hash, hash_from_packet,
1636 sizeof (hash_from_packet));
1639 BFD_ERR ("SHA1 hash: %U doesn't match the expected value: %U",
1640 format_hex_bytes, hash_from_packet, sizeof (hash_from_packet),
1641 format_hex_bytes, calculated_hash, sizeof (calculated_hash));
1646 bfd_verify_pkt_auth_key (vlib_main_t * vm, const bfd_pkt_t * pkt,
1647 u32 pkt_size, bfd_session_t * bs, u8 bfd_key_id,
1648 bfd_auth_key_t * auth_key)
1650 bfd_main_t *bm = &bfd_main;
1651 switch (auth_key->auth_type)
1653 case BFD_AUTH_TYPE_reserved:
1654 vlib_log_err (bm->log_class,
1655 "internal error, unexpected auth_type=%d:%s",
1656 auth_key->auth_type,
1657 bfd_auth_type_str (auth_key->auth_type));
1659 case BFD_AUTH_TYPE_simple_password:
1661 case BFD_AUTH_TYPE_keyed_md5:
1663 case BFD_AUTH_TYPE_meticulous_keyed_md5:
1666 "internal error, not implemented, unexpected auth_type=%d:%s",
1667 auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
1669 case BFD_AUTH_TYPE_keyed_sha1:
1671 case BFD_AUTH_TYPE_meticulous_keyed_sha1:
1674 const u32 seq_num = clib_net_to_host_u32 (((bfd_pkt_with_sha1_auth_t
1677 return bfd_verify_pkt_auth_seq_num (
1679 bfd_auth_type_is_meticulous (auth_key->auth_type)) &&
1680 bfd_verify_pkt_auth_key_sha1 (vm, pkt, pkt_size, bs,
1681 bfd_key_id, auth_key);
1689 * @brief verify bfd packet - authentication
1693 * @return 1 if bfd packet is valid
1696 bfd_verify_pkt_auth (vlib_main_t * vm, const bfd_pkt_t * pkt, u16 pkt_size,
1699 if (bfd_pkt_get_auth_present (pkt))
1701 /* authentication present in packet */
1702 if (!bs->auth.curr_key)
1704 /* currently not using authentication - can we turn it on? */
1705 if (bs->auth.is_delayed && bs->auth.next_key)
1707 /* yes, switch is scheduled - make sure the auth is valid */
1708 if (bfd_verify_pkt_auth_key (vm, pkt, pkt_size, bs,
1709 bs->auth.next_bfd_key_id,
1712 /* auth matches next key, do the switch, packet is valid */
1713 bfd_session_switch_auth_to_next (bs);
1720 /* yes, using authentication, verify the key */
1721 if (bfd_verify_pkt_auth_key (vm, pkt, pkt_size, bs,
1722 bs->auth.curr_bfd_key_id,
1725 /* verification passed, packet is valid */
1730 /* verification failed - but maybe we need to switch key */
1731 if (bs->auth.is_delayed && bs->auth.next_key)
1733 /* delayed switch present, verify if that key works */
1734 if (bfd_verify_pkt_auth_key (vm, pkt, pkt_size, bs,
1735 bs->auth.next_bfd_key_id,
1738 /* auth matches next key, switch key, packet is valid */
1739 bfd_session_switch_auth_to_next (bs);
1748 /* authentication in packet not present */
1749 if (pkt_size > sizeof (*pkt))
1751 BFD_ERR ("BFD verification failed - unexpected packet size '%d' "
1752 "(auth not present)", pkt_size);
1755 if (bs->auth.curr_key)
1757 /* currently authenticating - could we turn it off? */
1758 if (bs->auth.is_delayed && !bs->auth.next_key)
1760 /* yes, delayed switch to NULL key is scheduled */
1761 bfd_session_switch_auth_to_next (bs);
1767 /* no auth in packet, no auth in use - packet is valid */
1775 bfd_consume_pkt (vlib_main_t * vm, bfd_main_t * bm, const bfd_pkt_t * pkt,
1778 bfd_lock_check (bm);
1780 bfd_session_t *bs = bfd_find_session_by_idx (bm, bs_idx);
1781 if (!bs || (pkt->your_disc && pkt->your_disc != bs->local_discr))
1785 BFD_DBG ("Scanning bfd packet, bs_idx=%d", bs->bs_idx);
1786 bs->remote_discr = pkt->my_disc;
1787 bs->remote_state = bfd_pkt_get_state (pkt);
1788 bs->remote_demand = bfd_pkt_get_demand (pkt);
1789 bs->remote_diag = bfd_pkt_get_diag_code (pkt);
1790 u64 now = bfd_time_now_nsec (vm, NULL);
1791 bs->last_rx_nsec = now;
1792 if (bfd_pkt_get_auth_present (pkt))
1794 bfd_auth_type_e auth_type =
1795 ((bfd_pkt_with_common_auth_t *) (pkt))->common_auth.type;
1798 case BFD_AUTH_TYPE_reserved:
1800 case BFD_AUTH_TYPE_simple_password:
1802 case BFD_AUTH_TYPE_keyed_md5:
1804 case BFD_AUTH_TYPE_meticulous_keyed_md5:
1805 vlib_log_crit (bm->log_class,
1806 "internal error, unexpected auth_type=%d:%s",
1807 auth_type, bfd_auth_type_str (auth_type));
1809 case BFD_AUTH_TYPE_keyed_sha1:
1811 case BFD_AUTH_TYPE_meticulous_keyed_sha1:
1814 bfd_pkt_with_sha1_auth_t *with_sha1 =
1815 (bfd_pkt_with_sha1_auth_t *) pkt;
1816 bs->auth.remote_seq_number =
1817 clib_net_to_host_u32 (with_sha1->sha1_auth.seq_num);
1818 bs->auth.remote_seq_number_known = 1;
1819 BFD_DBG ("Received sequence number %u",
1820 bs->auth.remote_seq_number);
1825 bs->remote_desired_min_tx_nsec =
1826 bfd_usec_to_nsec (clib_net_to_host_u32 (pkt->des_min_tx));
1827 bs->remote_detect_mult = pkt->head.detect_mult;
1828 bfd_set_remote_required_min_rx (bs, clib_net_to_host_u32 (pkt->req_min_rx));
1829 bfd_set_remote_required_min_echo_rx (
1830 bs, clib_net_to_host_u32 (pkt->req_min_echo_rx));
1831 if (bfd_pkt_get_final (pkt))
1833 if (BFD_POLL_IN_PROGRESS == bs->poll_state)
1835 BFD_DBG ("Poll sequence terminated, bs_idx=%u", bs->bs_idx);
1836 bfd_set_poll_state (bs, BFD_POLL_NOT_NEEDED);
1837 if (BFD_STATE_up == bs->local_state)
1839 bfd_set_effective_desired_min_tx (
1840 bm, bs, now, bs->config_desired_min_tx_nsec);
1841 bfd_set_effective_required_min_rx (
1843 clib_max (bs->echo * bm->min_required_min_rx_while_echo_nsec,
1844 bs->config_required_min_rx_nsec));
1847 else if (BFD_POLL_IN_PROGRESS_AND_QUEUED == bs->poll_state)
1850 * next poll sequence must be delayed by at least the round trip
1851 * time, so calculate that here
1853 BFD_DBG ("Next poll sequence can commence in " BFD_CLK_FMT,
1854 BFD_CLK_PRN (now - bs->poll_state_start_or_timeout_nsec));
1855 bs->poll_state_start_or_timeout_nsec =
1856 now + (now - bs->poll_state_start_or_timeout_nsec);
1858 ("Poll sequence terminated, but another is needed, bs_idx=%u",
1860 bfd_set_poll_state (bs, BFD_POLL_NEEDED);
1863 bfd_calc_next_tx (bm, bs, now);
1864 bfd_set_timer (bm, bs, now, 0);
1865 if (BFD_STATE_admin_down == bs->local_state)
1867 BFD_DBG ("Session is admin-down, ignoring packet, bs_idx=%u",
1871 if (BFD_STATE_admin_down == bs->remote_state)
1873 bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
1874 bfd_set_state (vm, bm, bs, BFD_STATE_down, 0);
1876 else if (BFD_STATE_down == bs->local_state)
1878 if (BFD_STATE_down == bs->remote_state)
1880 bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
1881 bfd_set_state (vm, bm, bs, BFD_STATE_init, 0);
1883 else if (BFD_STATE_init == bs->remote_state)
1885 bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
1886 bfd_set_state (vm, bm, bs, BFD_STATE_up, 0);
1889 else if (BFD_STATE_init == bs->local_state)
1891 if (BFD_STATE_up == bs->remote_state ||
1892 BFD_STATE_init == bs->remote_state)
1894 bfd_set_diag (bs, BFD_DIAG_CODE_no_diag);
1895 bfd_set_state (vm, bm, bs, BFD_STATE_up, 0);
1898 else /* BFD_STATE_up == bs->local_state */
1900 if (BFD_STATE_down == bs->remote_state)
1902 bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
1903 bfd_set_state (vm, bm, bs, BFD_STATE_down, 0);
1909 bfd_consume_echo_pkt (vlib_main_t * vm, bfd_main_t * bm, vlib_buffer_t * b)
1911 bfd_echo_pkt_t *pkt = NULL;
1912 if (b->current_length != sizeof (*pkt))
1916 pkt = vlib_buffer_get_current (b);
1917 bfd_session_t *bs = bfd_find_session_by_disc (bm, pkt->discriminator);
1922 BFD_DBG ("Scanning bfd echo packet, bs_idx=%d", bs->bs_idx);
1924 bfd_calc_echo_checksum (bs->local_discr, pkt->expire_time_nsec,
1926 if (checksum != pkt->checksum)
1928 BFD_DBG ("Invalid echo packet, checksum mismatch");
1931 u64 now = bfd_time_now_nsec (vm, NULL);
1932 if (pkt->expire_time_nsec < now)
1934 BFD_DBG ("Stale packet received, expire time %lu < now %lu",
1935 pkt->expire_time_nsec, now);
1939 bs->echo_last_rx_nsec = now;
1945 format_bfd_session (u8 * s, va_list * args)
1947 const bfd_session_t *bs = va_arg (*args, bfd_session_t *);
1948 s = format (s, "bs_idx=%u local-state=%s remote-state=%s\n"
1949 "local-discriminator=%u remote-discriminator=%u\n"
1950 "local-diag=%s echo-active=%s\n"
1951 "desired-min-tx=%u required-min-rx=%u\n"
1952 "required-min-echo-rx=%u detect-mult=%u\n"
1953 "remote-min-rx=%u remote-min-echo-rx=%u\n"
1954 "remote-demand=%s poll-state=%s\n"
1955 "auth: local-seq-num=%u remote-seq-num=%u\n"
1959 bs->bs_idx, bfd_state_string (bs->local_state),
1960 bfd_state_string (bs->remote_state), bs->local_discr,
1961 bs->remote_discr, bfd_diag_code_string (bs->local_diag),
1962 (bs->echo ? "yes" : "no"), bs->config_desired_min_tx_usec,
1963 bs->config_required_min_rx_usec, 1, bs->local_detect_mult,
1964 bs->remote_min_rx_usec, bs->remote_min_echo_rx_usec,
1965 (bs->remote_demand ? "yes" : "no"),
1966 bfd_poll_state_string (bs->poll_state),
1967 bs->auth.local_seq_number, bs->auth.remote_seq_number,
1968 (bs->auth.is_delayed ? "yes" : "no"),
1969 format_bfd_auth_key, bs->auth.curr_key, format_bfd_auth_key,
1975 format_bfd_session_brief (u8 * s, va_list * args)
1977 const bfd_session_t *bs = va_arg (*args, bfd_session_t *);
1979 format (s, "bs_idx=%u local-state=%s remote-state=%s", bs->bs_idx,
1980 bfd_state_string (bs->local_state),
1981 bfd_state_string (bs->remote_state));
1986 bfd_auth_type_supported (bfd_auth_type_e auth_type)
1988 if (auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
1989 auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1)
1997 bfd_auth_activate (bfd_session_t * bs, u32 conf_key_id,
1998 u8 bfd_key_id, u8 is_delayed)
2000 bfd_main_t *bm = &bfd_main;
2001 const uword *key_idx_p =
2002 hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
2005 vlib_log_err (bm->log_class,
2006 "authentication key with config ID %u doesn't exist)",
2008 return VNET_API_ERROR_BFD_ENOENT;
2010 const uword key_idx = *key_idx_p;
2011 bfd_auth_key_t *key = pool_elt_at_index (bm->auth_keys, key_idx);
2014 if (bs->auth.next_key == key && bs->auth.next_bfd_key_id == bfd_key_id)
2016 /* already using this key, no changes required */
2019 if (bs->auth.next_key != key)
2022 bs->auth.next_key = key;
2024 bs->auth.next_bfd_key_id = bfd_key_id;
2025 bs->auth.is_delayed = 1;
2029 if (bs->auth.curr_key == key && bs->auth.curr_bfd_key_id == bfd_key_id)
2031 /* already using this key, no changes required */
2035 if (bs->auth.curr_key)
2037 --bs->auth.curr_key->use_count;
2039 bs->auth.curr_key = key;
2040 bs->auth.curr_bfd_key_id = bfd_key_id;
2041 bs->auth.is_delayed = 0;
2043 BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs);
2044 vlib_log_info (bm->log_class, "session auth modified: %U",
2045 format_bfd_session_brief, bs);
2050 bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed)
2052 bfd_main_t *bm = &bfd_main;
2055 /* not delayed - deactivate the current key right now */
2056 if (bs->auth.curr_key)
2058 --bs->auth.curr_key->use_count;
2059 bs->auth.curr_key = NULL;
2061 bs->auth.is_delayed = 0;
2065 /* delayed - mark as so */
2066 bs->auth.is_delayed = 1;
2069 * clear the next key unconditionally - either the auth change is not delayed
2070 * in which case the caller expects the session to not use authentication
2071 * from this point forward, or it is delayed, in which case the next_key
2072 * needs to be set to NULL to make it so in the future
2074 if (bs->auth.next_key)
2076 --bs->auth.next_key->use_count;
2077 bs->auth.next_key = NULL;
2079 BFD_DBG ("\nSession auth modified: %U", format_bfd_session, bs);
2080 vlib_log_info (bm->log_class, "session auth modified: %U",
2081 format_bfd_session_brief, bs);
2086 bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs,
2087 u32 desired_min_tx_usec,
2088 u32 required_min_rx_usec, u8 detect_mult)
2090 if (bs->local_detect_mult != detect_mult ||
2091 bs->config_desired_min_tx_usec != desired_min_tx_usec ||
2092 bs->config_required_min_rx_usec != required_min_rx_usec)
2094 BFD_DBG ("\nChanging session params: %U", format_bfd_session, bs);
2095 switch (bs->poll_state)
2097 case BFD_POLL_NOT_NEEDED:
2098 if (BFD_STATE_up == bs->local_state ||
2099 BFD_STATE_init == bs->local_state)
2101 /* poll sequence is not needed for detect multiplier change */
2102 if (bs->config_desired_min_tx_usec != desired_min_tx_usec ||
2103 bs->config_required_min_rx_usec != required_min_rx_usec)
2105 bfd_set_poll_state (bs, BFD_POLL_NEEDED);
2109 case BFD_POLL_NEEDED:
2110 case BFD_POLL_IN_PROGRESS_AND_QUEUED:
2112 * nothing to do - will be handled in the future poll which is
2113 * already scheduled for execution
2116 case BFD_POLL_IN_PROGRESS:
2117 /* poll sequence is not needed for detect multiplier change */
2118 if (bs->config_desired_min_tx_usec != desired_min_tx_usec ||
2119 bs->config_required_min_rx_usec != required_min_rx_usec)
2121 BFD_DBG ("Poll in progress, queueing extra poll, bs_idx=%u",
2123 bfd_set_poll_state (bs, BFD_POLL_IN_PROGRESS_AND_QUEUED);
2127 bs->local_detect_mult = detect_mult;
2128 bs->config_desired_min_tx_usec = desired_min_tx_usec;
2129 bs->config_desired_min_tx_nsec = bfd_usec_to_nsec (desired_min_tx_usec);
2130 bs->config_required_min_rx_usec = required_min_rx_usec;
2131 bs->config_required_min_rx_nsec =
2132 bfd_usec_to_nsec (required_min_rx_usec);
2133 BFD_DBG ("\nChanged session params: %U", format_bfd_session, bs);
2135 vlib_log_info (bm->log_class, "changed session params: %U",
2136 format_bfd_session_brief, bs);
2137 vlib_process_signal_event (bm->vlib_main, bm->bfd_process_node_index,
2138 BFD_EVENT_CONFIG_CHANGED, bs->bs_idx);
2142 BFD_DBG ("Ignore parameter change - no change, bs_idx=%u", bs->bs_idx);
2148 bfd_auth_set_key (u32 conf_key_id, u8 auth_type, u8 key_len,
2149 const u8 * key_data)
2151 bfd_main_t *bm = &bfd_main;
2152 bfd_auth_key_t *auth_key = NULL;
2153 if (!key_len || key_len > bfd_max_key_len_for_auth_type (auth_type))
2155 vlib_log_err (bm->log_class,
2156 "invalid authentication key length for auth_type=%d:%s "
2157 "(key_len=%u, must be non-zero, expected max=%u)",
2158 auth_type, bfd_auth_type_str (auth_type), key_len,
2159 (u32) bfd_max_key_len_for_auth_type (auth_type));
2160 return VNET_API_ERROR_INVALID_VALUE;
2162 if (!bfd_auth_type_supported (auth_type))
2164 vlib_log_err (bm->log_class, "unsupported auth type=%d:%s", auth_type,
2165 bfd_auth_type_str (auth_type));
2166 return VNET_API_ERROR_BFD_NOTSUPP;
2168 uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
2171 /* modifying existing key - must not be used */
2172 const uword key_idx = *key_idx_p;
2173 auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
2174 if (auth_key->use_count > 0)
2176 vlib_log_err (bm->log_class,
2177 "authentication key with conf ID %u in use by %u BFD "
2178 "session(s) - cannot modify", conf_key_id,
2179 auth_key->use_count);
2180 return VNET_API_ERROR_BFD_EINUSE;
2185 /* adding new key */
2186 pool_get (bm->auth_keys, auth_key);
2187 auth_key->conf_key_id = conf_key_id;
2188 hash_set (bm->auth_key_by_conf_key_id, conf_key_id,
2189 auth_key - bm->auth_keys);
2191 auth_key->auth_type = auth_type;
2192 clib_memset (auth_key->key, 0, sizeof (auth_key->key));
2193 clib_memcpy (auth_key->key, key_data, key_len);
2198 bfd_auth_del_key (u32 conf_key_id)
2200 bfd_auth_key_t *auth_key = NULL;
2201 bfd_main_t *bm = &bfd_main;
2202 uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
2205 /* deleting existing key - must not be used */
2206 const uword key_idx = *key_idx_p;
2207 auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
2208 if (auth_key->use_count > 0)
2210 vlib_log_err (bm->log_class,
2211 "authentication key with conf ID %u in use by %u BFD "
2212 "session(s) - cannot delete", conf_key_id,
2213 auth_key->use_count);
2214 return VNET_API_ERROR_BFD_EINUSE;
2216 hash_unset (bm->auth_key_by_conf_key_id, conf_key_id);
2217 clib_memset (auth_key, 0, sizeof (*auth_key));
2218 pool_put (bm->auth_keys, auth_key);
2223 vlib_log_err (bm->log_class,
2224 "authentication key with conf ID %u does not exist",
2226 return VNET_API_ERROR_BFD_ENOENT;
2231 bfd_main_t bfd_main;
2234 * fd.io coding-style-patch-verification: ON
2237 * eval: (c-set-style "gnu")