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 UDP transport layer implementation
19 #include <vppinfra/types.h>
20 #include <vlibmemory/api.h>
21 #include <vlib/vlib.h>
22 #include <vlib/buffer.h>
23 #include <vnet/ip/format.h>
24 #include <vnet/ethernet/packet.h>
25 #include <vnet/udp/udp_packet.h>
26 #include <vnet/udp/udp.h>
27 #include <vnet/ip/lookup.h>
28 #include <vnet/ip/icmp46_packet.h>
29 #include <vnet/ip/ip4.h>
30 #include <vnet/ip/ip6.h>
31 #include <vnet/ip/ip6_packet.h>
32 #include <vnet/adj/adj.h>
33 #include <vnet/adj/adj_nbr.h>
34 #include <vnet/dpo/receive_dpo.h>
35 #include <vnet/fib/fib_entry.h>
36 #include <vnet/fib/fib_table.h>
37 #include <vnet/bfd/bfd_debug.h>
38 #include <vnet/bfd/bfd_udp.h>
39 #include <vnet/bfd/bfd_main.h>
40 #include <vnet/bfd/bfd_api.h>
45 /* hashmap - bfd session index by bfd key - used for CLI/API lookup, where
46 * discriminator is unknown */
47 mhash_t bfd_session_idx_by_bfd_key;
48 /* convenience variable */
49 vnet_main_t *vnet_main;
50 /* flag indicating whether echo_source_sw_if_index holds a valid value */
51 int echo_source_is_set;
52 /* loopback interface used to get echo source ip */
53 u32 echo_source_sw_if_index;
54 /* node index of "ip4-arp" node */
56 /* node index of "ip6-discover-neighbor" node */
58 /* node index of "ip4-rewrite" node */
60 /* node index of "ip6-rewrite" node */
63 vlib_log_class_t log_class;
66 static vlib_node_registration_t bfd_udp4_input_node;
67 static vlib_node_registration_t bfd_udp6_input_node;
68 static vlib_node_registration_t bfd_udp_echo4_input_node;
69 static vlib_node_registration_t bfd_udp_echo6_input_node;
71 bfd_udp_main_t bfd_udp_main;
74 bfd_udp_set_echo_source (u32 sw_if_index)
76 vnet_sw_interface_t *sw_if =
77 vnet_get_sw_interface_safe (bfd_udp_main.vnet_main, sw_if_index);
80 bfd_udp_main.echo_source_sw_if_index = sw_if_index;
81 bfd_udp_main.echo_source_is_set = 1;
84 return VNET_API_ERROR_BFD_ENOENT;
88 bfd_udp_del_echo_source (u32 sw_if_index)
90 bfd_udp_main.echo_source_sw_if_index = ~0;
91 bfd_udp_main.echo_source_is_set = 0;
96 bfd_udp_is_echo_available (bfd_transport_e transport)
98 if (!bfd_udp_main.echo_source_is_set)
100 BFD_DBG ("UDP echo source not set - echo not available");
104 * for the echo to work, we need a loopback interface with at least one
105 * address with netmask length at most 31 (ip4) or 127 (ip6) so that we can
106 * pick an unused address from that subnet
108 vnet_sw_interface_t *sw_if =
109 vnet_get_sw_interface_safe (bfd_udp_main.vnet_main,
110 bfd_udp_main.echo_source_sw_if_index);
111 if (sw_if && sw_if->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
113 if (BFD_TRANSPORT_UDP4 == transport)
115 ip4_main_t *im = &ip4_main;
116 ip_interface_address_t *ia = NULL;
118 foreach_ip_interface_address (&im->lookup_main, ia,
119 bfd_udp_main.echo_source_sw_if_index,
120 0 /* honor unnumbered */, ({
121 if (ia->address_length <= 31)
128 else if (BFD_TRANSPORT_UDP6 == transport)
130 ip6_main_t *im = &ip6_main;
131 ip_interface_address_t *ia = NULL;
133 foreach_ip_interface_address (&im->lookup_main, ia,
134 bfd_udp_main.echo_source_sw_if_index,
135 0 /* honor unnumbered */, ({
136 if (ia->address_length <= 127)
144 BFD_DBG ("No usable IP address for UDP echo - echo not available");
149 bfd_udp_bs_idx_to_sport (u32 bs_idx)
151 /* The source port MUST be in the range 49152 through 65535. The same UDP
152 * source port number MUST be used for all BFD Control packets associated
153 * with a particular session. The source port number SHOULD be unique among
154 * all BFD sessions on the system. If more than 16384 BFD sessions are
155 * simultaneously active, UDP source port numbers MAY be reused on
156 * multiple sessions, but the number of distinct uses of the same UDP
157 * source port number SHOULD be minimized.
159 return 49152 + bs_idx % (65535 - 49152 + 1);
163 bfd_udp_get_echo_src_ip4 (ip4_address_t * addr)
165 if (!bfd_udp_main.echo_source_is_set)
167 BFD_ERR ("cannot find ip4 address, echo source not set");
170 ip_interface_address_t *ia = NULL;
171 ip4_main_t *im = &ip4_main;
174 foreach_ip_interface_address (
175 &im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index,
176 0 /* honor unnumbered */, ({
178 ip_interface_address_get_address (&im->lookup_main, ia);
179 if (ia->address_length <= 31)
181 addr->as_u32 = clib_host_to_net_u32 (x->as_u32);
183 * flip the last bit to get a different address, might be network,
187 addr->as_u32 = clib_net_to_host_u32 (addr->as_u32);
192 BFD_ERR ("cannot find ip4 address, no usable address found");
197 bfd_udp_get_echo_src_ip6 (ip6_address_t * addr)
199 if (!bfd_udp_main.echo_source_is_set)
201 BFD_ERR ("cannot find ip6 address, echo source not set");
204 ip_interface_address_t *ia = NULL;
205 ip6_main_t *im = &ip6_main;
208 foreach_ip_interface_address (
209 &im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index,
210 0 /* honor unnumbered */, ({
212 ip_interface_address_get_address (&im->lookup_main, ia);
213 if (ia->address_length <= 127)
216 addr->as_u8[15] ^= 1; /* flip the last bit of the address */
221 BFD_ERR ("cannot find ip6 address, no usable address found");
226 bfd_udp_get_echo_source (int *is_set, u32 * sw_if_index,
227 int *have_usable_ip4, ip4_address_t * ip4,
228 int *have_usable_ip6, ip6_address_t * ip6)
230 if (bfd_udp_main.echo_source_is_set)
233 *sw_if_index = bfd_udp_main.echo_source_sw_if_index;
234 *have_usable_ip4 = bfd_udp_get_echo_src_ip4 (ip4);
235 *have_usable_ip6 = bfd_udp_get_echo_src_ip6 (ip6);
244 bfd_add_udp4_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs,
247 const bfd_udp_session_t *bus = &bs->udp;
248 const bfd_udp_key_t *key = &bus->key;
249 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
251 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
252 vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
253 vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
254 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
255 vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
261 ip4_udp_headers *headers = NULL;
262 vlib_buffer_advance (b, -sizeof (*headers));
263 headers = vlib_buffer_get_current (b);
264 memset (headers, 0, sizeof (*headers));
265 headers->ip4.ip_version_and_header_length = 0x45;
266 headers->ip4.ttl = 255;
267 headers->ip4.protocol = IP_PROTOCOL_UDP;
268 headers->udp.src_port =
269 clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx));
273 if (!(rv = bfd_udp_get_echo_src_ip4 (&headers->ip4.src_address)))
277 headers->ip4.dst_address.as_u32 = key->local_addr.ip4.as_u32;
278 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo4);
282 headers->ip4.src_address.as_u32 = key->local_addr.ip4.as_u32;
283 headers->ip4.dst_address.as_u32 = key->peer_addr.ip4.as_u32;
284 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4);
287 /* fix ip length, checksum and udp length */
288 const u16 ip_length = vlib_buffer_length_in_chain (vm, b);
290 headers->ip4.length = clib_host_to_net_u16 (ip_length);
291 headers->ip4.checksum = ip4_header_checksum (&headers->ip4);
293 const u16 udp_length = ip_length - (sizeof (headers->ip4));
294 headers->udp.length = clib_host_to_net_u16 (udp_length);
299 bfd_add_udp6_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs,
302 const bfd_udp_session_t *bus = &bs->udp;
303 const bfd_udp_key_t *key = &bus->key;
304 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
306 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
307 vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
308 vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
309 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
310 vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
316 ip6_udp_headers *headers = NULL;
317 vlib_buffer_advance (b, -sizeof (*headers));
318 headers = vlib_buffer_get_current (b);
319 memset (headers, 0, sizeof (*headers));
320 headers->ip6.ip_version_traffic_class_and_flow_label =
321 clib_host_to_net_u32 (0x6 << 28);
322 headers->ip6.hop_limit = 255;
323 headers->ip6.protocol = IP_PROTOCOL_UDP;
324 headers->udp.src_port =
325 clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx));
329 if (!(rv = bfd_udp_get_echo_src_ip6 (&headers->ip6.src_address)))
333 clib_memcpy (&headers->ip6.dst_address, &key->local_addr.ip6,
334 sizeof (headers->ip6.dst_address));
336 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo6);
340 clib_memcpy (&headers->ip6.src_address, &key->local_addr.ip6,
341 sizeof (headers->ip6.src_address));
342 clib_memcpy (&headers->ip6.dst_address, &key->peer_addr.ip6,
343 sizeof (headers->ip6.dst_address));
344 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd6);
347 /* fix ip payload length and udp length */
348 const u16 udp_length =
349 vlib_buffer_length_in_chain (vm, b) - (sizeof (headers->ip6));
350 headers->udp.length = clib_host_to_net_u16 (udp_length);
351 headers->ip6.payload_length = headers->udp.length;
353 /* IPv6 UDP checksum is mandatory */
355 headers->udp.checksum =
356 ip6_tcp_udp_icmp_compute_checksum (vm, b, &headers->ip6, &bogus);
358 if (headers->udp.checksum == 0)
360 headers->udp.checksum = 0xffff;
366 bfd_create_frame_to_next_node (vlib_main_t * vm, u32 bi, u32 next_node)
368 vlib_frame_t *f = vlib_get_frame_to_node (vm, next_node);
369 u32 *to_next = vlib_frame_vector_args (f);
372 vlib_put_frame_to_node (vm, next_node, f);
376 bfd_udp_calc_next_node (const struct bfd_session_s *bs, u32 * next_node)
378 const bfd_udp_session_t *bus = &bs->udp;
379 ip_adjacency_t *adj = adj_get (bus->adj_index);
380 switch (adj->lookup_next_index)
382 case IP_LOOKUP_NEXT_ARP:
383 switch (bs->transport)
385 case BFD_TRANSPORT_UDP4:
386 *next_node = bfd_udp_main.ip4_arp_idx;
388 case BFD_TRANSPORT_UDP6:
389 *next_node = bfd_udp_main.ip6_ndp_idx;
393 case IP_LOOKUP_NEXT_REWRITE:
394 switch (bs->transport)
396 case BFD_TRANSPORT_UDP4:
397 *next_node = bfd_udp_main.ip4_rewrite_idx;
399 case BFD_TRANSPORT_UDP6:
400 *next_node = bfd_udp_main.ip6_rewrite_idx;
412 bfd_transport_udp4 (vlib_main_t * vm, u32 bi, const struct bfd_session_s *bs)
415 int rv = bfd_udp_calc_next_node (bs, &next_node);
418 bfd_create_frame_to_next_node (vm, bi, next_node);
424 bfd_transport_udp6 (vlib_main_t * vm, u32 bi, const struct bfd_session_s *bs)
427 int rv = bfd_udp_calc_next_node (bs, &next_node);
430 bfd_create_frame_to_next_node (vm, bi, next_node);
435 static bfd_session_t *
436 bfd_lookup_session (bfd_udp_main_t * bum, const bfd_udp_key_t * key)
438 uword *p = mhash_get (&bum->bfd_session_idx_by_bfd_key, key);
441 return bfd_find_session_by_idx (bum->bfd_main, *p);
447 bfd_udp_key_init (bfd_udp_key_t * key, u32 sw_if_index,
448 const ip46_address_t * local_addr,
449 const ip46_address_t * peer_addr)
451 memset (key, 0, sizeof (*key));
452 key->sw_if_index = sw_if_index;
453 key->local_addr.as_u64[0] = local_addr->as_u64[0];
454 key->local_addr.as_u64[1] = local_addr->as_u64[1];
455 key->peer_addr.as_u64[0] = peer_addr->as_u64[0];
456 key->peer_addr.as_u64[1] = peer_addr->as_u64[1];
459 static vnet_api_error_t
460 bfd_udp_add_session_internal (bfd_udp_main_t * bum, u32 sw_if_index,
461 u32 desired_min_tx_usec,
462 u32 required_min_rx_usec, u8 detect_mult,
463 const ip46_address_t * local_addr,
464 const ip46_address_t * peer_addr,
465 bfd_session_t ** bs_out)
467 /* get a pool entry and if we end up not needing it, give it back */
468 bfd_transport_e t = BFD_TRANSPORT_UDP4;
469 if (!ip46_address_is_ip4 (local_addr))
471 t = BFD_TRANSPORT_UDP6;
473 bfd_session_t *bs = bfd_get_session (bum->bfd_main, t);
476 bfd_put_session (bum->bfd_main, bs);
477 return VNET_API_ERROR_BFD_EAGAIN;
479 bfd_udp_session_t *bus = &bs->udp;
480 memset (bus, 0, sizeof (*bus));
481 bfd_udp_key_t *key = &bus->key;
482 bfd_udp_key_init (key, sw_if_index, local_addr, peer_addr);
483 const bfd_session_t *tmp = bfd_lookup_session (bum, key);
486 vlib_log_err (bum->log_class,
487 "duplicate bfd-udp session, existing bs_idx=%d",
489 bfd_put_session (bum->bfd_main, bs);
490 return VNET_API_ERROR_BFD_EEXIST;
492 mhash_set (&bum->bfd_session_idx_by_bfd_key, key, bs->bs_idx, NULL);
493 BFD_DBG ("session created, bs_idx=%u, sw_if_index=%d, local=%U, peer=%U",
494 bs->bs_idx, key->sw_if_index, format_ip46_address,
495 &key->local_addr, IP46_TYPE_ANY, format_ip46_address,
496 &key->peer_addr, IP46_TYPE_ANY);
497 vlib_log_info (bum->log_class, "create BFD session: %U",
498 format_bfd_session, bs);
499 if (BFD_TRANSPORT_UDP4 == t)
501 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, VNET_LINK_IP4,
504 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP4, VNET_LINK_IP4, %U, %d) "
505 "returns %d", format_ip46_address, &key->peer_addr,
506 IP46_TYPE_ANY, key->sw_if_index, bus->adj_index);
510 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6,
513 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP6, VNET_LINK_IP6, %U, %d) "
514 "returns %d", format_ip46_address, &key->peer_addr,
515 IP46_TYPE_ANY, key->sw_if_index, bus->adj_index);
518 return bfd_session_set_params (bum->bfd_main, bs, desired_min_tx_usec,
519 required_min_rx_usec, detect_mult);
522 static vnet_api_error_t
523 bfd_udp_validate_api_input (u32 sw_if_index,
524 const ip46_address_t * local_addr,
525 const ip46_address_t * peer_addr)
527 bfd_udp_main_t *bum = &bfd_udp_main;
528 vnet_sw_interface_t *sw_if =
529 vnet_get_sw_interface_safe (bfd_udp_main.vnet_main, sw_if_index);
530 u8 local_ip_valid = 0;
531 ip_interface_address_t *ia = NULL;
534 vlib_log_err (bum->log_class,
535 "got NULL sw_if when getting interface by index %u",
537 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
539 if (ip46_address_is_ip4 (local_addr))
541 if (!ip46_address_is_ip4 (peer_addr))
543 vlib_log_err (bum->log_class,
544 "IP family mismatch (local is ipv4, peer is ipv6)");
545 return VNET_API_ERROR_INVALID_ARGUMENT;
547 ip4_main_t *im = &ip4_main;
550 foreach_ip_interface_address (
551 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
553 ip_interface_address_get_address (&im->lookup_main, ia);
554 if (x->as_u32 == local_addr->ip4.as_u32)
556 /* valid address for this interface */
565 if (ip46_address_is_ip4 (peer_addr))
567 vlib_log_err (bum->log_class,
568 "IP family mismatch (local is ipv6, peer is ipv4)");
569 return VNET_API_ERROR_INVALID_ARGUMENT;
571 ip6_main_t *im = &ip6_main;
573 foreach_ip_interface_address (
574 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
576 ip_interface_address_get_address (&im->lookup_main, ia);
577 if (local_addr->ip6.as_u64[0] == x->as_u64[0] &&
578 local_addr->ip6.as_u64[1] == x->as_u64[1])
580 /* valid address for this interface */
590 vlib_log_err (bum->log_class,
591 "local address %U not found on interface with index %u",
592 format_ip46_address, local_addr, IP46_TYPE_ANY,
594 return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
600 static vnet_api_error_t
601 bfd_udp_find_session_by_api_input (u32 sw_if_index,
602 const ip46_address_t * local_addr,
603 const ip46_address_t * peer_addr,
604 bfd_session_t ** bs_out)
606 vnet_api_error_t rv =
607 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
610 bfd_udp_main_t *bum = &bfd_udp_main;
612 bfd_udp_key_init (&key, sw_if_index, local_addr, peer_addr);
613 bfd_session_t *bs = bfd_lookup_session (bum, &key);
620 vlib_log_err (bum->log_class,
621 "BFD session not found, sw_if_index=%u, local=%U, peer=%U",
622 sw_if_index, format_ip46_address, local_addr,
623 IP46_TYPE_ANY, format_ip46_address, peer_addr,
625 return VNET_API_ERROR_BFD_ENOENT;
631 static vnet_api_error_t
632 bfd_api_verify_common (u32 sw_if_index, u32 desired_min_tx_usec,
633 u32 required_min_rx_usec, u8 detect_mult,
634 const ip46_address_t * local_addr,
635 const ip46_address_t * peer_addr)
637 bfd_udp_main_t *bum = &bfd_udp_main;
638 vnet_api_error_t rv =
639 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
646 vlib_log_err (bum->log_class, "detect_mult < 1");
647 return VNET_API_ERROR_INVALID_ARGUMENT;
649 if (desired_min_tx_usec < 1)
651 vlib_log_err (bum->log_class, "desired_min_tx_usec < 1");
652 return VNET_API_ERROR_INVALID_ARGUMENT;
658 bfd_udp_del_session_internal (bfd_session_t * bs)
660 bfd_udp_main_t *bum = &bfd_udp_main;
661 BFD_DBG ("free bfd-udp session, bs_idx=%d", bs->bs_idx);
662 mhash_unset (&bum->bfd_session_idx_by_bfd_key, &bs->udp.key, NULL);
663 adj_unlock (bs->udp.adj_index);
664 bfd_put_session (bum->bfd_main, bs);
668 bfd_udp_add_session (u32 sw_if_index, const ip46_address_t * local_addr,
669 const ip46_address_t * peer_addr,
670 u32 desired_min_tx_usec, u32 required_min_rx_usec,
671 u8 detect_mult, u8 is_authenticated, u32 conf_key_id,
674 vnet_api_error_t rv =
675 bfd_api_verify_common (sw_if_index, desired_min_tx_usec,
676 required_min_rx_usec, detect_mult,
677 local_addr, peer_addr);
678 bfd_session_t *bs = NULL;
682 bfd_udp_add_session_internal (&bfd_udp_main, sw_if_index,
684 required_min_rx_usec, detect_mult,
685 local_addr, peer_addr, &bs);
687 if (!rv && is_authenticated)
690 rv = bfd_auth_activate (bs, conf_key_id, bfd_key_id,
691 0 /* is not delayed */ );
693 vlib_log_err (bfd_udp_main.log_class,
694 "SSL missing, cannot add authenticated BFD session");
695 rv = VNET_API_ERROR_BFD_NOTSUPP;
699 bfd_udp_del_session_internal (bs);
704 bfd_session_start (bfd_udp_main.bfd_main, bs);
711 bfd_udp_mod_session (u32 sw_if_index,
712 const ip46_address_t * local_addr,
713 const ip46_address_t * peer_addr,
714 u32 desired_min_tx_usec,
715 u32 required_min_rx_usec, u8 detect_mult)
717 bfd_session_t *bs = NULL;
718 vnet_api_error_t rv =
719 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
726 return bfd_session_set_params (bfd_udp_main.bfd_main, bs,
727 desired_min_tx_usec, required_min_rx_usec,
732 bfd_udp_del_session (u32 sw_if_index,
733 const ip46_address_t * local_addr,
734 const ip46_address_t * peer_addr)
736 bfd_session_t *bs = NULL;
737 vnet_api_error_t rv =
738 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
744 bfd_udp_del_session_internal (bs);
749 bfd_udp_session_set_flags (u32 sw_if_index,
750 const ip46_address_t * local_addr,
751 const ip46_address_t * peer_addr, u8 admin_up_down)
753 bfd_session_t *bs = NULL;
754 vnet_api_error_t rv =
755 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
761 bfd_session_set_flags (bs, admin_up_down);
766 bfd_udp_auth_activate (u32 sw_if_index,
767 const ip46_address_t * local_addr,
768 const ip46_address_t * peer_addr,
769 u32 conf_key_id, u8 key_id, u8 is_delayed)
772 bfd_session_t *bs = NULL;
773 vnet_api_error_t rv =
774 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
780 return bfd_auth_activate (bs, conf_key_id, key_id, is_delayed);
782 vlib_log_err (bfd_udp_main->log_class,
783 "SSL missing, cannot activate BFD authentication");
784 return VNET_API_ERROR_BFD_NOTSUPP;
789 bfd_udp_auth_deactivate (u32 sw_if_index,
790 const ip46_address_t * local_addr,
791 const ip46_address_t * peer_addr, u8 is_delayed)
793 bfd_session_t *bs = NULL;
794 vnet_api_error_t rv =
795 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
801 return bfd_auth_deactivate (bs, is_delayed);
806 BFD_UDP_INPUT_NEXT_NORMAL,
807 BFD_UDP_INPUT_NEXT_REPLY_ARP,
808 BFD_UDP_INPUT_NEXT_REPLY_REWRITE,
809 BFD_UDP_INPUT_N_NEXT,
810 } bfd_udp_input_next_t;
812 /* Packet counters - BFD control frames */
813 #define foreach_bfd_udp_error(F) \
814 F (NONE, "good bfd packets (processed)") \
815 F (BAD, "invalid bfd packets")
817 #define F(sym, string) static char BFD_UDP_ERR_##sym##_STR[] = string;
818 foreach_bfd_udp_error (F);
821 static char *bfd_udp_error_strings[] = {
822 #define F(sym, string) BFD_UDP_ERR_##sym##_STR,
823 foreach_bfd_udp_error (F)
829 #define F(sym, str) BFD_UDP_ERROR_##sym,
830 foreach_bfd_udp_error (F)
835 /* Packet counters - BFD ECHO packets */
836 #define foreach_bfd_udp_echo_error(F) \
837 F (NONE, "good bfd echo packets (processed)") \
838 F (BAD, "invalid bfd echo packets")
840 #define F(sym, string) static char BFD_UDP_ECHO_ERR_##sym##_STR[] = string;
841 foreach_bfd_udp_echo_error (F);
844 static char *bfd_udp_echo_error_strings[] = {
845 #define F(sym, string) BFD_UDP_ECHO_ERR_##sym##_STR,
846 foreach_bfd_udp_echo_error (F)
852 #define F(sym, str) BFD_UDP_ECHO_ERROR_##sym,
853 foreach_bfd_udp_echo_error (F)
855 BFD_UDP_ECHO_N_ERROR,
856 } bfd_udp_echo_error_t;
859 bfd_udp4_find_headers (vlib_buffer_t * b, ip4_header_t ** ip4,
862 /* sanity check first */
863 const i32 start = vnet_buffer (b)->l3_hdr_offset;
864 if (start < 0 && start < sizeof (b->pre_data))
866 BFD_ERR ("Start of ip header is before pre_data, ignoring");
871 *ip4 = (ip4_header_t *) (b->data + start);
872 if ((u8 *) * ip4 > (u8 *) vlib_buffer_get_current (b))
874 BFD_ERR ("Start of ip header is beyond current data, ignoring");
879 *udp = (udp_header_t *) ((*ip4) + 1);
882 static bfd_udp_error_t
883 bfd_udp4_verify_transport (const ip4_header_t * ip4,
884 const udp_header_t * udp, const bfd_session_t * bs)
886 const bfd_udp_session_t *bus = &bs->udp;
887 const bfd_udp_key_t *key = &bus->key;
888 if (ip4->src_address.as_u32 != key->peer_addr.ip4.as_u32)
890 BFD_ERR ("IPv4 src addr mismatch, got %U, expected %U",
891 format_ip4_address, ip4->src_address.as_u8, format_ip4_address,
892 key->peer_addr.ip4.as_u8);
893 return BFD_UDP_ERROR_BAD;
895 if (ip4->dst_address.as_u32 != key->local_addr.ip4.as_u32)
897 BFD_ERR ("IPv4 dst addr mismatch, got %U, expected %U",
898 format_ip4_address, ip4->dst_address.as_u8, format_ip4_address,
899 key->local_addr.ip4.as_u8);
900 return BFD_UDP_ERROR_BAD;
902 const u8 expected_ttl = 255;
903 if (ip4->ttl != expected_ttl)
905 BFD_ERR ("IPv4 unexpected TTL value %u, expected %u", ip4->ttl,
907 return BFD_UDP_ERROR_BAD;
909 if (clib_net_to_host_u16 (udp->src_port) < 49152)
911 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
914 return BFD_UDP_ERROR_NONE;
924 bfd_rpc_update_session_cb (const bfd_rpc_update_t * a)
926 bfd_consume_pkt (bfd_udp_main.bfd_main, &a->pkt, a->bs_idx);
930 bfd_rpc_update_session (u32 bs_idx, const bfd_pkt_t * pkt)
932 /* packet length was already verified to be correct by the caller */
933 const u32 data_size = sizeof (bfd_rpc_update_t) -
934 STRUCT_SIZE_OF (bfd_rpc_update_t, pkt) + pkt->head.length;
936 bfd_rpc_update_t *update = (bfd_rpc_update_t *) data;
937 update->bs_idx = bs_idx;
938 clib_memcpy (&update->pkt, pkt, pkt->head.length);
939 vl_api_rpc_call_main_thread (bfd_rpc_update_session_cb, data, data_size);
942 static bfd_udp_error_t
943 bfd_udp4_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
944 vlib_buffer_t * b, bfd_session_t ** bs_out)
946 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
947 if (sizeof (*pkt) > b->current_length)
950 ("Payload size %d too small to hold bfd packet of minimum size %d",
951 b->current_length, sizeof (*pkt));
952 return BFD_UDP_ERROR_BAD;
956 bfd_udp4_find_headers (b, &ip4, &udp);
959 BFD_ERR ("Couldn't find ip4 or udp header");
960 return BFD_UDP_ERROR_BAD;
962 const u32 udp_payload_length = udp->length - sizeof (*udp);
963 if (pkt->head.length > udp_payload_length)
966 ("BFD packet length is larger than udp payload length (%u > %u)",
967 pkt->head.length, udp_payload_length);
968 return BFD_UDP_ERROR_BAD;
970 if (!bfd_verify_pkt_common (pkt))
972 return BFD_UDP_ERROR_BAD;
974 bfd_session_t *bs = NULL;
977 BFD_DBG ("Looking up BFD session using discriminator %u",
979 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
984 memset (&key, 0, sizeof (key));
985 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
986 key.local_addr.ip4.as_u32 = ip4->dst_address.as_u32;
987 key.peer_addr.ip4.as_u32 = ip4->src_address.as_u32;
988 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
990 key.sw_if_index, format_ip4_address, key.local_addr.ip4.as_u8,
991 format_ip4_address, key.peer_addr.ip4.as_u8);
992 bs = bfd_lookup_session (&bfd_udp_main, &key);
996 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
997 return BFD_UDP_ERROR_BAD;
999 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
1000 if (!bfd_verify_pkt_auth (pkt, b->current_length, bs))
1002 BFD_ERR ("Packet verification failed, dropping packet");
1003 return BFD_UDP_ERROR_BAD;
1005 bfd_udp_error_t err;
1006 if (BFD_UDP_ERROR_NONE != (err = bfd_udp4_verify_transport (ip4, udp, bs)))
1010 bfd_rpc_update_session (bs->bs_idx, pkt);
1012 return BFD_UDP_ERROR_NONE;
1016 bfd_udp6_find_headers (vlib_buffer_t * b, ip6_header_t ** ip6,
1017 udp_header_t ** udp)
1019 /* sanity check first */
1020 const i32 start = vnet_buffer (b)->l3_hdr_offset;
1021 if (start < 0 && start < sizeof (b->pre_data))
1023 BFD_ERR ("Start of ip header is before pre_data, ignoring");
1028 *ip6 = (ip6_header_t *) (b->data + start);
1029 if ((u8 *) * ip6 > (u8 *) vlib_buffer_get_current (b))
1031 BFD_ERR ("Start of ip header is beyond current data, ignoring");
1036 if ((*ip6)->protocol != IP_PROTOCOL_UDP)
1038 BFD_ERR ("Unexpected protocol in IPv6 header '%u', expected '%u' (== "
1039 "IP_PROTOCOL_UDP)", (*ip6)->protocol, IP_PROTOCOL_UDP);
1044 *udp = (udp_header_t *) ((*ip6) + 1);
1047 static bfd_udp_error_t
1048 bfd_udp6_verify_transport (const ip6_header_t * ip6,
1049 const udp_header_t * udp, const bfd_session_t * bs)
1051 const bfd_udp_session_t *bus = &bs->udp;
1052 const bfd_udp_key_t *key = &bus->key;
1053 if (ip6->src_address.as_u64[0] != key->peer_addr.ip6.as_u64[0] &&
1054 ip6->src_address.as_u64[1] != key->peer_addr.ip6.as_u64[1])
1056 BFD_ERR ("IP src addr mismatch, got %U, expected %U",
1057 format_ip6_address, ip6, format_ip6_address,
1058 &key->peer_addr.ip6);
1059 return BFD_UDP_ERROR_BAD;
1061 if (ip6->dst_address.as_u64[0] != key->local_addr.ip6.as_u64[0] &&
1062 ip6->dst_address.as_u64[1] != key->local_addr.ip6.as_u64[1])
1064 BFD_ERR ("IP dst addr mismatch, got %U, expected %U",
1065 format_ip6_address, ip6, format_ip6_address,
1066 &key->local_addr.ip6);
1067 return BFD_UDP_ERROR_BAD;
1069 const u8 expected_hop_limit = 255;
1070 if (ip6->hop_limit != expected_hop_limit)
1072 BFD_ERR ("IPv6 unexpected hop-limit value %u, expected %u",
1073 ip6->hop_limit, expected_hop_limit);
1074 return BFD_UDP_ERROR_BAD;
1076 if (clib_net_to_host_u16 (udp->src_port) < 49152)
1078 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
1081 return BFD_UDP_ERROR_NONE;
1084 static bfd_udp_error_t
1085 bfd_udp6_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
1086 vlib_buffer_t * b, bfd_session_t ** bs_out)
1088 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
1089 if (sizeof (*pkt) > b->current_length)
1092 ("Payload size %d too small to hold bfd packet of minimum size %d",
1093 b->current_length, sizeof (*pkt));
1094 return BFD_UDP_ERROR_BAD;
1098 bfd_udp6_find_headers (b, &ip6, &udp);
1101 BFD_ERR ("Couldn't find ip6 or udp header");
1102 return BFD_UDP_ERROR_BAD;
1104 const u32 udp_payload_length = udp->length - sizeof (*udp);
1105 if (pkt->head.length > udp_payload_length)
1108 ("BFD packet length is larger than udp payload length (%u > %u)",
1109 pkt->head.length, udp_payload_length);
1110 return BFD_UDP_ERROR_BAD;
1112 if (!bfd_verify_pkt_common (pkt))
1114 return BFD_UDP_ERROR_BAD;
1116 bfd_session_t *bs = NULL;
1119 BFD_DBG ("Looking up BFD session using discriminator %u",
1121 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
1126 memset (&key, 0, sizeof (key));
1127 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
1128 key.local_addr.ip6.as_u64[0] = ip6->dst_address.as_u64[0];
1129 key.local_addr.ip6.as_u64[1] = ip6->dst_address.as_u64[1];
1130 key.peer_addr.ip6.as_u64[0] = ip6->src_address.as_u64[0];
1131 key.peer_addr.ip6.as_u64[1] = ip6->src_address.as_u64[1];
1132 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
1134 key.sw_if_index, format_ip6_address, &key.local_addr,
1135 format_ip6_address, &key.peer_addr);
1136 bs = bfd_lookup_session (&bfd_udp_main, &key);
1140 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
1141 return BFD_UDP_ERROR_BAD;
1143 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
1144 if (!bfd_verify_pkt_auth (pkt, b->current_length, bs))
1146 BFD_ERR ("Packet verification failed, dropping packet");
1147 return BFD_UDP_ERROR_BAD;
1149 bfd_udp_error_t err;
1150 if (BFD_UDP_ERROR_NONE != (err = bfd_udp6_verify_transport (ip6, udp, bs)))
1154 bfd_rpc_update_session (bs->bs_idx, pkt);
1156 return BFD_UDP_ERROR_NONE;
1160 * Process a frame of bfd packets
1161 * Expect 1 packet / frame
1164 bfd_udp_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1165 vlib_frame_t * f, int is_ipv6)
1167 u32 n_left_from, *from;
1168 bfd_input_trace_t *t0;
1170 from = vlib_frame_vector_args (f); /* array of buffer indices */
1171 n_left_from = f->n_vectors; /* number of buffer indices */
1173 while (n_left_from > 0)
1180 b0 = vlib_get_buffer (vm, bi0);
1182 bfd_session_t *bs = NULL;
1184 /* If this pkt is traced, snapshot the data */
1185 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1188 t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
1189 len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
1190 : sizeof (t0->data);
1192 clib_memcpy (t0->data, vlib_buffer_get_current (b0), len);
1195 /* scan this bfd pkt. error0 is the counter index to bmp */
1198 error0 = bfd_udp6_scan (vm, rt, b0, &bs);
1202 error0 = bfd_udp4_scan (vm, rt, b0, &bs);
1204 b0->error = rt->errors[error0];
1206 next0 = BFD_UDP_INPUT_NEXT_NORMAL;
1207 if (BFD_UDP_ERROR_NONE == error0)
1210 * if everything went fine, check for poll bit, if present, re-use
1211 * the buffer and based on (now updated) session parameters, send
1212 * the final packet back
1214 const bfd_pkt_t *pkt = vlib_buffer_get_current (b0);
1215 if (bfd_pkt_get_poll (pkt))
1217 b0->current_data = 0;
1218 b0->current_length = 0;
1219 memset (vnet_buffer (b0), 0, sizeof (*vnet_buffer (b0)));
1220 bfd_init_final_control_frame (vm, b0, bfd_udp_main.bfd_main, bs,
1224 vlib_node_increment_counter (vm, bfd_udp6_input_node.index,
1229 vlib_node_increment_counter (vm, bfd_udp4_input_node.index,
1232 const bfd_udp_session_t *bus = &bs->udp;
1233 ip_adjacency_t *adj = adj_get (bus->adj_index);
1234 switch (adj->lookup_next_index)
1236 case IP_LOOKUP_NEXT_ARP:
1237 next0 = BFD_UDP_INPUT_NEXT_REPLY_ARP;
1239 case IP_LOOKUP_NEXT_REWRITE:
1240 next0 = BFD_UDP_INPUT_NEXT_REPLY_REWRITE;
1248 vlib_set_next_frame_buffer (vm, rt, next0, bi0);
1254 return f->n_vectors;
1258 bfd_udp4_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
1260 return bfd_udp_input (vm, rt, f, 0);
1264 * bfd input graph node declaration
1267 VLIB_REGISTER_NODE (bfd_udp4_input_node, static) = {
1268 .function = bfd_udp4_input,
1269 .name = "bfd-udp4-input",
1270 .vector_size = sizeof (u32),
1271 .type = VLIB_NODE_TYPE_INTERNAL,
1273 .n_errors = BFD_UDP_N_ERROR,
1274 .error_strings = bfd_udp_error_strings,
1276 .format_trace = bfd_input_format_trace,
1278 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1281 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1282 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
1283 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
1289 bfd_udp6_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
1291 return bfd_udp_input (vm, rt, f, 1);
1295 VLIB_REGISTER_NODE (bfd_udp6_input_node, static) = {
1296 .function = bfd_udp6_input,
1297 .name = "bfd-udp6-input",
1298 .vector_size = sizeof (u32),
1299 .type = VLIB_NODE_TYPE_INTERNAL,
1301 .n_errors = BFD_UDP_N_ERROR,
1302 .error_strings = bfd_udp_error_strings,
1304 .format_trace = bfd_input_format_trace,
1306 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1309 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1310 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
1311 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
1317 * Process a frame of bfd echo packets
1318 * Expect 1 packet / frame
1321 bfd_udp_echo_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1322 vlib_frame_t * f, int is_ipv6)
1324 u32 n_left_from, *from;
1325 bfd_input_trace_t *t0;
1327 from = vlib_frame_vector_args (f); /* array of buffer indices */
1328 n_left_from = f->n_vectors; /* number of buffer indices */
1330 while (n_left_from > 0)
1337 b0 = vlib_get_buffer (vm, bi0);
1339 /* If this pkt is traced, snapshot the data */
1340 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1343 t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
1344 len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
1345 : sizeof (t0->data);
1347 clib_memcpy (t0->data, vlib_buffer_get_current (b0), len);
1350 if (bfd_consume_echo_pkt (bfd_udp_main.bfd_main, b0))
1352 b0->error = rt->errors[BFD_UDP_ERROR_NONE];
1353 next0 = BFD_UDP_INPUT_NEXT_NORMAL;
1357 /* loop back the packet */
1358 b0->error = rt->errors[BFD_UDP_ERROR_NONE];
1361 vlib_node_increment_counter (vm, bfd_udp_echo6_input_node.index,
1366 vlib_node_increment_counter (vm, bfd_udp_echo4_input_node.index,
1369 next0 = BFD_UDP_INPUT_NEXT_REPLY_REWRITE;
1372 vlib_set_next_frame_buffer (vm, rt, next0, bi0);
1378 return f->n_vectors;
1382 bfd_udp_echo4_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1385 return bfd_udp_echo_input (vm, rt, f, 0);
1389 bfd_echo_input_format_trace (u8 * s, va_list * args)
1391 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1392 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1393 const bfd_udp_echo_input_trace_t *t =
1394 va_arg (*args, bfd_udp_echo_input_trace_t *);
1395 if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head))
1397 s = format (s, "BFD ECHO:\n");
1398 s = format (s, " data: %U", format_hexdump, t->data, t->len);
1405 * bfd input graph node declaration
1408 VLIB_REGISTER_NODE (bfd_udp_echo4_input_node, static) = {
1409 .function = bfd_udp_echo4_input,
1410 .name = "bfd-udp-echo4-input",
1411 .vector_size = sizeof (u32),
1412 .type = VLIB_NODE_TYPE_INTERNAL,
1414 .n_errors = BFD_UDP_ECHO_N_ERROR,
1415 .error_strings = bfd_udp_error_strings,
1417 .format_trace = bfd_echo_input_format_trace,
1419 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1422 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1423 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
1424 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
1430 bfd_udp_echo6_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1433 return bfd_udp_echo_input (vm, rt, f, 1);
1437 VLIB_REGISTER_NODE (bfd_udp_echo6_input_node, static) = {
1438 .function = bfd_udp_echo6_input,
1439 .name = "bfd-udp-echo6-input",
1440 .vector_size = sizeof (u32),
1441 .type = VLIB_NODE_TYPE_INTERNAL,
1443 .n_errors = BFD_UDP_ECHO_N_ERROR,
1444 .error_strings = bfd_udp_echo_error_strings,
1446 .format_trace = bfd_echo_input_format_trace,
1448 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1451 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1452 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
1453 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
1459 static clib_error_t *
1460 bfd_udp_sw_if_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_create)
1462 bfd_session_t **to_be_freed = NULL;
1463 bfd_udp_main_t *bum = &bfd_udp_main;
1464 BFD_DBG ("sw_if_add_del called, sw_if_index=%u, is_create=%u", sw_if_index,
1469 pool_foreach (bs, bfd_udp_main.bfd_main->sessions,
1471 if (bs->transport != BFD_TRANSPORT_UDP4 &&
1472 bs->transport != BFD_TRANSPORT_UDP6)
1475 if (bs->udp.key.sw_if_index != sw_if_index)
1478 vec_add1 (to_be_freed, bs);}
1482 vec_foreach (bs, to_be_freed)
1484 vlib_log_notice (bum->log_class,
1485 "removal of sw_if_index=%u forces removal of bfd session "
1486 "with bs_idx=%u", sw_if_index, (*bs)->bs_idx);
1487 bfd_session_set_flags (*bs, 0);
1488 bfd_udp_del_session_internal (*bs);
1493 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (bfd_udp_sw_if_add_del);
1498 static clib_error_t *
1499 bfd_udp_init (vlib_main_t * vm)
1501 mhash_init (&bfd_udp_main.bfd_session_idx_by_bfd_key, sizeof (uword),
1502 sizeof (bfd_udp_key_t));
1503 bfd_udp_main.bfd_main = &bfd_main;
1504 bfd_udp_main.vnet_main = vnet_get_main ();
1505 udp_register_dst_port (vm, UDP_DST_PORT_bfd4, bfd_udp4_input_node.index, 1);
1506 udp_register_dst_port (vm, UDP_DST_PORT_bfd6, bfd_udp6_input_node.index, 0);
1507 udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo4,
1508 bfd_udp_echo4_input_node.index, 1);
1509 udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo6,
1510 bfd_udp_echo6_input_node.index, 0);
1511 vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip4-arp");
1513 bfd_udp_main.ip4_arp_idx = node->index;
1514 node = vlib_get_node_by_name (vm, (u8 *) "ip6-discover-neighbor");
1516 bfd_udp_main.ip6_ndp_idx = node->index;
1517 node = vlib_get_node_by_name (vm, (u8 *) "ip4-rewrite");
1519 bfd_udp_main.ip4_rewrite_idx = node->index;
1520 node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite");
1522 bfd_udp_main.ip6_rewrite_idx = node->index;
1524 bfd_udp_main.log_class = vlib_log_register_class ("bfd", "udp");
1525 vlib_log_debug (bfd_udp_main.log_class, "initialized");
1529 VLIB_INIT_FUNCTION (bfd_udp_init);
1532 * fd.io coding-style-patch-verification: ON
1535 * eval: (c-set-style "gnu")