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_local.h>
26 #include <vnet/udp/udp_packet.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/ip/ip6_link.h>
33 #include <vnet/adj/adj.h>
34 #include <vnet/adj/adj_nbr.h>
35 #include <vnet/dpo/receive_dpo.h>
36 #include <vnet/fib/fib_entry.h>
37 #include <vnet/fib/fib_table.h>
38 #include <vnet/bfd/bfd_debug.h>
39 #include <vnet/bfd/bfd_udp.h>
40 #include <vnet/bfd/bfd_main.h>
41 #include <vnet/bfd/bfd_api.h>
46 /* hashmap - bfd session index by bfd key - used for CLI/API lookup, where
47 * discriminator is unknown */
48 mhash_t bfd_session_idx_by_bfd_key;
49 /* convenience variable */
50 vnet_main_t *vnet_main;
51 /* flag indicating whether echo_source_sw_if_index holds a valid value */
52 int echo_source_is_set;
53 /* loopback interface used to get echo source ip */
54 u32 echo_source_sw_if_index;
55 /* node index of "ip4-arp" node */
57 /* node index of "ip6-discover-neighbor" node */
59 /* node index of "ip4-rewrite" node */
61 /* node index of "ip6-rewrite" node */
63 /* node index of "ip4-midchain" node */
65 /* node index of "ip6-midchain" node */
68 vlib_log_class_t log_class;
69 /* number of active udp4 sessions */
70 u32 udp4_sessions_count;
71 /* number of active udp6 sessions */
72 u32 udp6_sessions_count;
75 static vlib_node_registration_t bfd_udp4_input_node;
76 static vlib_node_registration_t bfd_udp6_input_node;
77 static vlib_node_registration_t bfd_udp_echo4_input_node;
78 static vlib_node_registration_t bfd_udp_echo6_input_node;
80 bfd_udp_main_t bfd_udp_main;
83 bfd_udp_set_echo_source (u32 sw_if_index)
85 vnet_sw_interface_t *sw_if =
86 vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main, sw_if_index);
89 bfd_udp_main.echo_source_sw_if_index = sw_if_index;
90 bfd_udp_main.echo_source_is_set = 1;
93 return VNET_API_ERROR_BFD_ENOENT;
97 bfd_udp_del_echo_source (u32 sw_if_index)
99 bfd_udp_main.echo_source_sw_if_index = ~0;
100 bfd_udp_main.echo_source_is_set = 0;
105 bfd_udp_is_echo_available (bfd_transport_e transport)
107 if (!bfd_udp_main.echo_source_is_set)
109 BFD_DBG ("UDP echo source not set - echo not available");
113 * for the echo to work, we need a loopback interface with at least one
114 * address with netmask length at most 31 (ip4) or 127 (ip6) so that we can
115 * pick an unused address from that subnet
117 vnet_sw_interface_t *sw_if =
118 vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main,
119 bfd_udp_main.echo_source_sw_if_index);
120 if (sw_if && sw_if->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
122 if (BFD_TRANSPORT_UDP4 == transport)
124 ip4_main_t *im = &ip4_main;
125 ip_interface_address_t *ia = NULL;
127 foreach_ip_interface_address (&im->lookup_main, ia,
128 bfd_udp_main.echo_source_sw_if_index,
129 0 /* honor unnumbered */, ({
130 if (ia->address_length <= 31)
137 else if (BFD_TRANSPORT_UDP6 == transport)
139 ip6_main_t *im = &ip6_main;
140 ip_interface_address_t *ia = NULL;
142 foreach_ip_interface_address (&im->lookup_main, ia,
143 bfd_udp_main.echo_source_sw_if_index,
144 0 /* honor unnumbered */, ({
145 if (ia->address_length <= 127)
153 BFD_DBG ("No usable IP address for UDP echo - echo not available");
158 bfd_udp_bs_idx_to_sport (u32 bs_idx)
160 /* The source port MUST be in the range 49152 through 65535. The same UDP
161 * source port number MUST be used for all BFD Control packets associated
162 * with a particular session. The source port number SHOULD be unique among
163 * all BFD sessions on the system. If more than 16384 BFD sessions are
164 * simultaneously active, UDP source port numbers MAY be reused on
165 * multiple sessions, but the number of distinct uses of the same UDP
166 * source port number SHOULD be minimized.
168 return 49152 + bs_idx % (65535 - 49152 + 1);
172 bfd_udp_get_echo_src_ip4 (ip4_address_t * addr)
174 if (!bfd_udp_main.echo_source_is_set)
176 BFD_ERR ("cannot find ip4 address, echo source not set");
179 ip_interface_address_t *ia = NULL;
180 ip4_main_t *im = &ip4_main;
183 foreach_ip_interface_address (
184 &im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index,
185 0 /* honor unnumbered */, ({
187 ip_interface_address_get_address (&im->lookup_main, ia);
188 if (ia->address_length <= 31)
190 addr->as_u32 = clib_host_to_net_u32 (x->as_u32);
192 * flip the last bit to get a different address, might be network,
196 addr->as_u32 = clib_net_to_host_u32 (addr->as_u32);
201 BFD_ERR ("cannot find ip4 address, no usable address found");
206 bfd_udp_get_echo_src_ip6 (ip6_address_t * addr)
208 if (!bfd_udp_main.echo_source_is_set)
210 BFD_ERR ("cannot find ip6 address, echo source not set");
213 ip_interface_address_t *ia = NULL;
214 ip6_main_t *im = &ip6_main;
217 foreach_ip_interface_address (
218 &im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index,
219 0 /* honor unnumbered */, ({
221 ip_interface_address_get_address (&im->lookup_main, ia);
222 if (ia->address_length <= 127)
225 addr->as_u8[15] ^= 1; /* flip the last bit of the address */
230 BFD_ERR ("cannot find ip6 address, no usable address found");
235 bfd_udp_get_echo_source (int *is_set, u32 * sw_if_index,
236 int *have_usable_ip4, ip4_address_t * ip4,
237 int *have_usable_ip6, ip6_address_t * ip6)
239 if (bfd_udp_main.echo_source_is_set)
242 *sw_if_index = bfd_udp_main.echo_source_sw_if_index;
243 *have_usable_ip4 = bfd_udp_get_echo_src_ip4 (ip4);
244 *have_usable_ip6 = bfd_udp_get_echo_src_ip6 (ip6);
253 bfd_add_udp4_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs,
256 const bfd_udp_session_t *bus = &bs->udp;
257 const bfd_udp_key_t *key = &bus->key;
258 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
260 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
261 vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
262 vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
263 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
264 vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
270 ip4_udp_headers *headers = NULL;
271 vlib_buffer_advance (b, -sizeof (*headers));
272 headers = vlib_buffer_get_current (b);
273 clib_memset (headers, 0, sizeof (*headers));
274 headers->ip4.ip_version_and_header_length = 0x45;
275 headers->ip4.ttl = 255;
276 headers->ip4.protocol = IP_PROTOCOL_UDP;
277 headers->udp.src_port =
278 clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx));
282 if (!(rv = bfd_udp_get_echo_src_ip4 (&headers->ip4.src_address)))
286 headers->ip4.dst_address.as_u32 = key->local_addr.ip4.as_u32;
287 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo4);
291 headers->ip4.src_address.as_u32 = key->local_addr.ip4.as_u32;
292 headers->ip4.dst_address.as_u32 = key->peer_addr.ip4.as_u32;
293 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4);
296 /* fix ip length, checksum and udp length */
297 const u16 ip_length = vlib_buffer_length_in_chain (vm, b);
299 headers->ip4.length = clib_host_to_net_u16 (ip_length);
300 headers->ip4.checksum = ip4_header_checksum (&headers->ip4);
302 const u16 udp_length = ip_length - (sizeof (headers->ip4));
303 headers->udp.length = clib_host_to_net_u16 (udp_length);
308 bfd_add_udp6_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs,
311 const bfd_udp_session_t *bus = &bs->udp;
312 const bfd_udp_key_t *key = &bus->key;
313 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
315 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
316 vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
317 vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
318 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
319 vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
325 ip6_udp_headers *headers = NULL;
326 vlib_buffer_advance (b, -sizeof (*headers));
327 headers = vlib_buffer_get_current (b);
328 clib_memset (headers, 0, sizeof (*headers));
329 headers->ip6.ip_version_traffic_class_and_flow_label =
330 clib_host_to_net_u32 (0x6 << 28);
331 headers->ip6.hop_limit = 255;
332 headers->ip6.protocol = IP_PROTOCOL_UDP;
333 headers->udp.src_port =
334 clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx));
338 if (!(rv = bfd_udp_get_echo_src_ip6 (&headers->ip6.src_address)))
342 clib_memcpy_fast (&headers->ip6.dst_address, &key->local_addr.ip6,
343 sizeof (headers->ip6.dst_address));
345 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo6);
349 clib_memcpy_fast (&headers->ip6.src_address, &key->local_addr.ip6,
350 sizeof (headers->ip6.src_address));
351 clib_memcpy_fast (&headers->ip6.dst_address, &key->peer_addr.ip6,
352 sizeof (headers->ip6.dst_address));
353 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd6);
356 /* fix ip payload length and udp length */
357 const u16 udp_length =
358 vlib_buffer_length_in_chain (vm, b) - (sizeof (headers->ip6));
359 headers->udp.length = clib_host_to_net_u16 (udp_length);
360 headers->ip6.payload_length = headers->udp.length;
362 /* IPv6 UDP checksum is mandatory */
364 headers->udp.checksum =
365 ip6_tcp_udp_icmp_compute_checksum (vm, b, &headers->ip6, &bogus);
367 if (headers->udp.checksum == 0)
369 headers->udp.checksum = 0xffff;
375 bfd_create_frame_to_next_node (vlib_main_t * vm, u32 bi, u32 next_node)
377 vlib_frame_t *f = vlib_get_frame_to_node (vm, next_node);
378 u32 *to_next = vlib_frame_vector_args (f);
381 vlib_put_frame_to_node (vm, next_node, f);
385 bfd_udp_calc_next_node (const struct bfd_session_s *bs, u32 * next_node)
387 vnet_main_t *vnm = vnet_get_main ();
388 const bfd_udp_session_t *bus = &bs->udp;
389 ip_adjacency_t *adj = adj_get (bus->adj_index);
391 /* don't try to send the buffer if the interface is not up */
392 if (!vnet_sw_interface_is_up (vnm, bus->key.sw_if_index))
395 switch (adj->lookup_next_index)
397 case IP_LOOKUP_NEXT_ARP:
398 switch (bs->transport)
400 case BFD_TRANSPORT_UDP4:
401 *next_node = bfd_udp_main.ip4_arp_idx;
403 case BFD_TRANSPORT_UDP6:
404 *next_node = bfd_udp_main.ip6_ndp_idx;
408 case IP_LOOKUP_NEXT_REWRITE:
409 switch (bs->transport)
411 case BFD_TRANSPORT_UDP4:
412 *next_node = bfd_udp_main.ip4_rewrite_idx;
414 case BFD_TRANSPORT_UDP6:
415 *next_node = bfd_udp_main.ip6_rewrite_idx;
419 case IP_LOOKUP_NEXT_MIDCHAIN:
420 switch (bs->transport)
422 case BFD_TRANSPORT_UDP4:
423 *next_node = bfd_udp_main.ip4_midchain_idx;
425 case BFD_TRANSPORT_UDP6:
426 *next_node = bfd_udp_main.ip6_midchain_idx;
438 bfd_transport_udp4 (vlib_main_t * vm, u32 bi, const struct bfd_session_s *bs)
441 int rv = bfd_udp_calc_next_node (bs, &next_node);
444 bfd_create_frame_to_next_node (vm, bi, next_node);
450 bfd_transport_udp6 (vlib_main_t * vm, u32 bi, const struct bfd_session_s *bs)
453 int rv = bfd_udp_calc_next_node (bs, &next_node);
456 bfd_create_frame_to_next_node (vm, bi, next_node);
461 static bfd_session_t *
462 bfd_lookup_session (bfd_udp_main_t * bum, const bfd_udp_key_t * key)
464 uword *p = mhash_get (&bum->bfd_session_idx_by_bfd_key, key);
467 return bfd_find_session_by_idx (bum->bfd_main, *p);
473 bfd_udp_key_init (bfd_udp_key_t * key, u32 sw_if_index,
474 const ip46_address_t * local_addr,
475 const ip46_address_t * peer_addr)
477 clib_memset (key, 0, sizeof (*key));
478 key->sw_if_index = sw_if_index;
479 key->local_addr.as_u64[0] = local_addr->as_u64[0];
480 key->local_addr.as_u64[1] = local_addr->as_u64[1];
481 key->peer_addr.as_u64[0] = peer_addr->as_u64[0];
482 key->peer_addr.as_u64[1] = peer_addr->as_u64[1];
485 static vnet_api_error_t
486 bfd_udp_add_session_internal (vlib_main_t * vm, bfd_udp_main_t * bum,
487 u32 sw_if_index, u32 desired_min_tx_usec,
488 u32 required_min_rx_usec, u8 detect_mult,
489 const ip46_address_t * local_addr,
490 const ip46_address_t * peer_addr,
491 bfd_session_t ** bs_out)
493 /* get a pool entry and if we end up not needing it, give it back */
494 bfd_transport_e t = BFD_TRANSPORT_UDP4;
495 if (!ip46_address_is_ip4 (local_addr))
497 t = BFD_TRANSPORT_UDP6;
499 bfd_session_t *bs = bfd_get_session (bum->bfd_main, t);
502 return VNET_API_ERROR_BFD_EAGAIN;
504 bfd_udp_session_t *bus = &bs->udp;
505 clib_memset (bus, 0, sizeof (*bus));
506 bfd_udp_key_t *key = &bus->key;
507 bfd_udp_key_init (key, sw_if_index, local_addr, peer_addr);
508 const bfd_session_t *tmp = bfd_lookup_session (bum, key);
511 vlib_log_err (bum->log_class,
512 "duplicate bfd-udp session, existing bs_idx=%d",
514 bfd_put_session (bum->bfd_main, bs);
515 return VNET_API_ERROR_BFD_EEXIST;
517 mhash_set (&bum->bfd_session_idx_by_bfd_key, key, bs->bs_idx, NULL);
518 BFD_DBG ("session created, bs_idx=%u, sw_if_index=%d, local=%U, peer=%U",
519 bs->bs_idx, key->sw_if_index, format_ip46_address,
520 &key->local_addr, IP46_TYPE_ANY, format_ip46_address,
521 &key->peer_addr, IP46_TYPE_ANY);
522 vlib_log_info (bum->log_class, "create BFD session: %U",
523 format_bfd_session, bs);
524 if (BFD_TRANSPORT_UDP4 == t)
526 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, VNET_LINK_IP4,
529 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP4, VNET_LINK_IP4, %U, %d) "
530 "returns %d", format_ip46_address, &key->peer_addr,
531 IP46_TYPE_ANY, key->sw_if_index, bus->adj_index);
532 ++bum->udp4_sessions_count;
533 if (1 == bum->udp4_sessions_count)
535 udp_register_dst_port (vm, UDP_DST_PORT_bfd4,
536 bfd_udp4_input_node.index, 1);
537 udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo4,
538 bfd_udp_echo4_input_node.index, 1);
543 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6,
546 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP6, VNET_LINK_IP6, %U, %d) "
547 "returns %d", format_ip46_address, &key->peer_addr,
548 IP46_TYPE_ANY, key->sw_if_index, bus->adj_index);
549 ++bum->udp6_sessions_count;
550 if (1 == bum->udp6_sessions_count)
552 udp_register_dst_port (vm, UDP_DST_PORT_bfd6,
553 bfd_udp6_input_node.index, 0);
554 udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo6,
555 bfd_udp_echo6_input_node.index, 0);
559 return bfd_session_set_params (bum->bfd_main, bs, desired_min_tx_usec,
560 required_min_rx_usec, detect_mult);
563 static vnet_api_error_t
564 bfd_udp_validate_api_input (u32 sw_if_index,
565 const ip46_address_t * local_addr,
566 const ip46_address_t * peer_addr)
568 bfd_udp_main_t *bum = &bfd_udp_main;
569 vnet_sw_interface_t *sw_if =
570 vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main, sw_if_index);
571 u8 local_ip_valid = 0;
572 ip_interface_address_t *ia = NULL;
575 vlib_log_err (bum->log_class,
576 "got NULL sw_if when getting interface by index %u",
578 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
580 if (ip46_address_is_ip4 (local_addr))
582 if (!ip46_address_is_ip4 (peer_addr))
584 vlib_log_err (bum->log_class,
585 "IP family mismatch (local is ipv4, peer is ipv6)");
586 return VNET_API_ERROR_INVALID_ARGUMENT;
588 ip4_main_t *im = &ip4_main;
591 foreach_ip_interface_address (
592 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
594 ip_interface_address_get_address (&im->lookup_main, ia);
595 if (x->as_u32 == local_addr->ip4.as_u32)
597 /* valid address for this interface */
606 if (ip46_address_is_ip4 (peer_addr))
608 vlib_log_err (bum->log_class,
609 "IP family mismatch (local is ipv6, peer is ipv4)");
610 return VNET_API_ERROR_INVALID_ARGUMENT;
613 if (ip6_address_is_link_local_unicast (&local_addr->ip6))
615 const ip6_address_t *ll_addr;
616 ll_addr = ip6_get_link_local_address (sw_if_index);
617 if (ll_addr && ip6_address_is_equal (ll_addr, &local_addr->ip6))
619 /* valid address for this interface */
625 ip6_main_t *im = &ip6_main;
627 foreach_ip_interface_address (
628 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
630 ip_interface_address_get_address (&im->lookup_main, ia);
631 if (local_addr->ip6.as_u64[0] == x->as_u64[0] &&
632 local_addr->ip6.as_u64[1] == x->as_u64[1])
634 /* valid address for this interface */
645 vlib_log_err (bum->log_class,
646 "local address %U not found on interface with index %u",
647 format_ip46_address, local_addr, IP46_TYPE_ANY,
649 return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
655 static vnet_api_error_t
656 bfd_udp_find_session_by_api_input (u32 sw_if_index,
657 const ip46_address_t * local_addr,
658 const ip46_address_t * peer_addr,
659 bfd_session_t ** bs_out)
661 vnet_api_error_t rv =
662 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
665 bfd_udp_main_t *bum = &bfd_udp_main;
667 bfd_udp_key_init (&key, sw_if_index, local_addr, peer_addr);
668 bfd_session_t *bs = bfd_lookup_session (bum, &key);
675 vlib_log_err (bum->log_class,
676 "BFD session not found, sw_if_index=%u, local=%U, peer=%U",
677 sw_if_index, format_ip46_address, local_addr,
678 IP46_TYPE_ANY, format_ip46_address, peer_addr,
680 return VNET_API_ERROR_BFD_ENOENT;
686 static vnet_api_error_t
687 bfd_api_verify_common (u32 sw_if_index, u32 desired_min_tx_usec,
688 u32 required_min_rx_usec, u8 detect_mult,
689 const ip46_address_t * local_addr,
690 const ip46_address_t * peer_addr)
692 bfd_udp_main_t *bum = &bfd_udp_main;
693 vnet_api_error_t rv =
694 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
701 vlib_log_err (bum->log_class, "detect_mult < 1");
702 return VNET_API_ERROR_INVALID_ARGUMENT;
704 if (desired_min_tx_usec < 1)
706 vlib_log_err (bum->log_class, "desired_min_tx_usec < 1");
707 return VNET_API_ERROR_INVALID_ARGUMENT;
713 bfd_udp_del_session_internal (vlib_main_t * vm, bfd_session_t * bs)
715 bfd_udp_main_t *bum = &bfd_udp_main;
716 BFD_DBG ("free bfd-udp session, bs_idx=%d", bs->bs_idx);
717 mhash_unset (&bum->bfd_session_idx_by_bfd_key, &bs->udp.key, NULL);
718 adj_unlock (bs->udp.adj_index);
719 switch (bs->transport)
721 case BFD_TRANSPORT_UDP4:
722 --bum->udp4_sessions_count;
723 if (!bum->udp4_sessions_count)
725 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd4, 1);
726 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo4, 1);
729 case BFD_TRANSPORT_UDP6:
730 --bum->udp6_sessions_count;
731 if (!bum->udp6_sessions_count)
733 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd6, 0);
734 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo6, 0);
738 bfd_put_session (bum->bfd_main, bs);
742 bfd_udp_add_session (u32 sw_if_index, const ip46_address_t * local_addr,
743 const ip46_address_t * peer_addr,
744 u32 desired_min_tx_usec, u32 required_min_rx_usec,
745 u8 detect_mult, u8 is_authenticated, u32 conf_key_id,
748 bfd_main_t *bm = &bfd_main;
751 vnet_api_error_t rv =
752 bfd_api_verify_common (sw_if_index, desired_min_tx_usec,
753 required_min_rx_usec, detect_mult,
754 local_addr, peer_addr);
755 bfd_session_t *bs = NULL;
759 bfd_udp_add_session_internal (vlib_get_main (), &bfd_udp_main,
760 sw_if_index, desired_min_tx_usec,
761 required_min_rx_usec, detect_mult,
762 local_addr, peer_addr, &bs);
764 if (!rv && is_authenticated)
766 rv = bfd_auth_activate (bs, conf_key_id, bfd_key_id,
767 0 /* is not delayed */ );
770 bfd_udp_del_session_internal (vlib_get_main (), bs);
775 bfd_session_start (bfd_udp_main.bfd_main, bs);
783 bfd_udp_mod_session (u32 sw_if_index,
784 const ip46_address_t * local_addr,
785 const ip46_address_t * peer_addr,
786 u32 desired_min_tx_usec,
787 u32 required_min_rx_usec, u8 detect_mult)
789 bfd_session_t *bs = NULL;
790 bfd_main_t *bm = &bfd_main;
791 vnet_api_error_t error;
793 vnet_api_error_t rv =
794 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
802 error = bfd_session_set_params (bfd_udp_main.bfd_main, bs,
803 desired_min_tx_usec, required_min_rx_usec,
810 bfd_udp_del_session (u32 sw_if_index,
811 const ip46_address_t * local_addr,
812 const ip46_address_t * peer_addr)
814 bfd_session_t *bs = NULL;
815 bfd_main_t *bm = &bfd_main;
817 vnet_api_error_t rv =
818 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
825 bfd_udp_del_session_internal (vlib_get_main (), bs);
831 bfd_udp_session_set_flags (vlib_main_t * vm, u32 sw_if_index,
832 const ip46_address_t * local_addr,
833 const ip46_address_t * peer_addr, u8 admin_up_down)
835 bfd_session_t *bs = NULL;
836 bfd_main_t *bm = &bfd_main;
838 vnet_api_error_t rv =
839 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
846 bfd_session_set_flags (vm, bs, admin_up_down);
852 bfd_udp_auth_activate (u32 sw_if_index,
853 const ip46_address_t * local_addr,
854 const ip46_address_t * peer_addr,
855 u32 conf_key_id, u8 key_id, u8 is_delayed)
857 bfd_main_t *bm = &bfd_main;
859 vnet_api_error_t error;
861 bfd_session_t *bs = NULL;
862 vnet_api_error_t rv =
863 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
870 error = bfd_auth_activate (bs, conf_key_id, key_id, is_delayed);
876 bfd_udp_auth_deactivate (u32 sw_if_index,
877 const ip46_address_t * local_addr,
878 const ip46_address_t * peer_addr, u8 is_delayed)
880 bfd_main_t *bm = &bfd_main;
881 vnet_api_error_t error;
883 bfd_session_t *bs = NULL;
884 vnet_api_error_t rv =
885 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
892 error = bfd_auth_deactivate (bs, is_delayed);
899 BFD_UDP_INPUT_NEXT_NORMAL,
900 BFD_UDP_INPUT_NEXT_REPLY_ARP,
901 BFD_UDP_INPUT_NEXT_REPLY_REWRITE,
902 BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN,
903 BFD_UDP_INPUT_N_NEXT,
904 } bfd_udp_input_next_t;
906 /* Packet counters - BFD control frames */
907 #define foreach_bfd_udp_error(F) \
908 F (NONE, "good bfd packets (processed)") \
909 F (BAD, "invalid bfd packets")
911 #define F(sym, string) static char BFD_UDP_ERR_##sym##_STR[] = string;
912 foreach_bfd_udp_error (F);
915 static char *bfd_udp_error_strings[] = {
916 #define F(sym, string) BFD_UDP_ERR_##sym##_STR,
917 foreach_bfd_udp_error (F)
923 #define F(sym, str) BFD_UDP_ERROR_##sym,
924 foreach_bfd_udp_error (F)
931 BFD_UDP_ECHO_INPUT_NEXT_NORMAL,
932 BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP,
933 BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE,
934 BFD_UDP_ECHO_INPUT_N_NEXT,
935 } bfd_udp_echo_input_next_t;
937 /* Packet counters - BFD ECHO packets */
938 #define foreach_bfd_udp_echo_error(F) \
939 F (NONE, "good bfd echo packets (processed)") \
940 F (BAD, "invalid bfd echo packets")
942 #define F(sym, string) static char BFD_UDP_ECHO_ERR_##sym##_STR[] = string;
943 foreach_bfd_udp_echo_error (F);
946 static char *bfd_udp_echo_error_strings[] = {
947 #define F(sym, string) BFD_UDP_ECHO_ERR_##sym##_STR,
948 foreach_bfd_udp_echo_error (F)
954 #define F(sym, str) BFD_UDP_ECHO_ERROR_##sym,
955 foreach_bfd_udp_echo_error (F)
957 BFD_UDP_ECHO_N_ERROR,
958 } bfd_udp_echo_error_t;
961 bfd_udp4_find_headers (vlib_buffer_t * b, ip4_header_t ** ip4,
964 /* sanity check first */
965 const i32 start = vnet_buffer (b)->l3_hdr_offset;
966 if (start < 0 && start < sizeof (b->pre_data))
968 BFD_ERR ("Start of ip header is before pre_data, ignoring");
973 *ip4 = (ip4_header_t *) (b->data + start);
974 if ((u8 *) * ip4 > (u8 *) vlib_buffer_get_current (b))
976 BFD_ERR ("Start of ip header is beyond current data, ignoring");
981 *udp = (udp_header_t *) ((*ip4) + 1);
984 static bfd_udp_error_t
985 bfd_udp4_verify_transport (const ip4_header_t * ip4,
986 const udp_header_t * udp, const bfd_session_t * bs)
988 const bfd_udp_session_t *bus = &bs->udp;
989 const bfd_udp_key_t *key = &bus->key;
990 if (ip4->src_address.as_u32 != key->peer_addr.ip4.as_u32)
992 BFD_ERR ("IPv4 src addr mismatch, got %U, expected %U",
993 format_ip4_address, ip4->src_address.as_u8, format_ip4_address,
994 key->peer_addr.ip4.as_u8);
995 return BFD_UDP_ERROR_BAD;
997 if (ip4->dst_address.as_u32 != key->local_addr.ip4.as_u32)
999 BFD_ERR ("IPv4 dst addr mismatch, got %U, expected %U",
1000 format_ip4_address, ip4->dst_address.as_u8, format_ip4_address,
1001 key->local_addr.ip4.as_u8);
1002 return BFD_UDP_ERROR_BAD;
1004 const u8 expected_ttl = 255;
1005 if (ip4->ttl != expected_ttl)
1007 BFD_ERR ("IPv4 unexpected TTL value %u, expected %u", ip4->ttl,
1009 return BFD_UDP_ERROR_BAD;
1011 if (clib_net_to_host_u16 (udp->src_port) < 49152)
1013 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
1016 return BFD_UDP_ERROR_NONE;
1026 bfd_rpc_update_session (vlib_main_t * vm, u32 bs_idx, const bfd_pkt_t * pkt)
1028 bfd_main_t *bm = &bfd_main;
1030 bfd_consume_pkt (vm, bm, pkt, bs_idx);
1034 static bfd_udp_error_t
1035 bfd_udp4_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
1036 vlib_buffer_t * b, bfd_session_t ** bs_out)
1038 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
1039 if (sizeof (*pkt) > b->current_length)
1042 ("Payload size %d too small to hold bfd packet of minimum size %d",
1043 b->current_length, sizeof (*pkt));
1044 return BFD_UDP_ERROR_BAD;
1048 bfd_udp4_find_headers (b, &ip4, &udp);
1051 BFD_ERR ("Couldn't find ip4 or udp header");
1052 return BFD_UDP_ERROR_BAD;
1054 const u32 udp_payload_length = udp->length - sizeof (*udp);
1055 if (pkt->head.length > udp_payload_length)
1058 ("BFD packet length is larger than udp payload length (%u > %u)",
1059 pkt->head.length, udp_payload_length);
1060 return BFD_UDP_ERROR_BAD;
1062 if (!bfd_verify_pkt_common (pkt))
1064 return BFD_UDP_ERROR_BAD;
1066 bfd_session_t *bs = NULL;
1069 BFD_DBG ("Looking up BFD session using discriminator %u",
1071 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
1076 clib_memset (&key, 0, sizeof (key));
1077 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
1078 key.local_addr.ip4.as_u32 = ip4->dst_address.as_u32;
1079 key.peer_addr.ip4.as_u32 = ip4->src_address.as_u32;
1080 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
1082 key.sw_if_index, format_ip4_address, key.local_addr.ip4.as_u8,
1083 format_ip4_address, key.peer_addr.ip4.as_u8);
1084 bs = bfd_lookup_session (&bfd_udp_main, &key);
1088 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
1089 return BFD_UDP_ERROR_BAD;
1091 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
1092 if (!bfd_verify_pkt_auth (vm, pkt, b->current_length, bs))
1094 BFD_ERR ("Packet verification failed, dropping packet");
1095 return BFD_UDP_ERROR_BAD;
1097 bfd_udp_error_t err;
1098 if (BFD_UDP_ERROR_NONE != (err = bfd_udp4_verify_transport (ip4, udp, bs)))
1102 bfd_rpc_update_session (vm, bs->bs_idx, pkt);
1104 return BFD_UDP_ERROR_NONE;
1108 bfd_udp6_find_headers (vlib_buffer_t * b, ip6_header_t ** ip6,
1109 udp_header_t ** udp)
1111 /* sanity check first */
1112 const i32 start = vnet_buffer (b)->l3_hdr_offset;
1113 if (start < 0 && start < sizeof (b->pre_data))
1115 BFD_ERR ("Start of ip header is before pre_data, ignoring");
1120 *ip6 = (ip6_header_t *) (b->data + start);
1121 if ((u8 *) * ip6 > (u8 *) vlib_buffer_get_current (b))
1123 BFD_ERR ("Start of ip header is beyond current data, ignoring");
1128 if ((*ip6)->protocol != IP_PROTOCOL_UDP)
1130 BFD_ERR ("Unexpected protocol in IPv6 header '%u', expected '%u' (== "
1131 "IP_PROTOCOL_UDP)", (*ip6)->protocol, IP_PROTOCOL_UDP);
1136 *udp = (udp_header_t *) ((*ip6) + 1);
1139 static bfd_udp_error_t
1140 bfd_udp6_verify_transport (const ip6_header_t * ip6,
1141 const udp_header_t * udp, const bfd_session_t * bs)
1143 const bfd_udp_session_t *bus = &bs->udp;
1144 const bfd_udp_key_t *key = &bus->key;
1145 if (ip6->src_address.as_u64[0] != key->peer_addr.ip6.as_u64[0] &&
1146 ip6->src_address.as_u64[1] != key->peer_addr.ip6.as_u64[1])
1148 BFD_ERR ("IP src addr mismatch, got %U, expected %U",
1149 format_ip6_address, ip6, format_ip6_address,
1150 &key->peer_addr.ip6);
1151 return BFD_UDP_ERROR_BAD;
1153 if (ip6->dst_address.as_u64[0] != key->local_addr.ip6.as_u64[0] &&
1154 ip6->dst_address.as_u64[1] != key->local_addr.ip6.as_u64[1])
1156 BFD_ERR ("IP dst addr mismatch, got %U, expected %U",
1157 format_ip6_address, ip6, format_ip6_address,
1158 &key->local_addr.ip6);
1159 return BFD_UDP_ERROR_BAD;
1161 const u8 expected_hop_limit = 255;
1162 if (ip6->hop_limit != expected_hop_limit)
1164 BFD_ERR ("IPv6 unexpected hop-limit value %u, expected %u",
1165 ip6->hop_limit, expected_hop_limit);
1166 return BFD_UDP_ERROR_BAD;
1168 if (clib_net_to_host_u16 (udp->src_port) < 49152)
1170 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
1173 return BFD_UDP_ERROR_NONE;
1176 static bfd_udp_error_t
1177 bfd_udp6_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
1178 vlib_buffer_t * b, bfd_session_t ** bs_out)
1180 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
1181 if (sizeof (*pkt) > b->current_length)
1184 ("Payload size %d too small to hold bfd packet of minimum size %d",
1185 b->current_length, sizeof (*pkt));
1186 return BFD_UDP_ERROR_BAD;
1190 bfd_udp6_find_headers (b, &ip6, &udp);
1193 BFD_ERR ("Couldn't find ip6 or udp header");
1194 return BFD_UDP_ERROR_BAD;
1196 const u32 udp_payload_length = udp->length - sizeof (*udp);
1197 if (pkt->head.length > udp_payload_length)
1200 ("BFD packet length is larger than udp payload length (%u > %u)",
1201 pkt->head.length, udp_payload_length);
1202 return BFD_UDP_ERROR_BAD;
1204 if (!bfd_verify_pkt_common (pkt))
1206 return BFD_UDP_ERROR_BAD;
1208 bfd_session_t *bs = NULL;
1211 BFD_DBG ("Looking up BFD session using discriminator %u",
1213 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
1218 clib_memset (&key, 0, sizeof (key));
1219 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
1220 key.local_addr.ip6.as_u64[0] = ip6->dst_address.as_u64[0];
1221 key.local_addr.ip6.as_u64[1] = ip6->dst_address.as_u64[1];
1222 key.peer_addr.ip6.as_u64[0] = ip6->src_address.as_u64[0];
1223 key.peer_addr.ip6.as_u64[1] = ip6->src_address.as_u64[1];
1224 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
1226 key.sw_if_index, format_ip6_address, &key.local_addr,
1227 format_ip6_address, &key.peer_addr);
1228 bs = bfd_lookup_session (&bfd_udp_main, &key);
1232 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
1233 return BFD_UDP_ERROR_BAD;
1235 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
1236 if (!bfd_verify_pkt_auth (vm, pkt, b->current_length, bs))
1238 BFD_ERR ("Packet verification failed, dropping packet");
1239 return BFD_UDP_ERROR_BAD;
1241 bfd_udp_error_t err;
1242 if (BFD_UDP_ERROR_NONE != (err = bfd_udp6_verify_transport (ip6, udp, bs)))
1246 bfd_rpc_update_session (vm, bs->bs_idx, pkt);
1248 return BFD_UDP_ERROR_NONE;
1252 * Process a frame of bfd packets
1253 * Expect 1 packet / frame
1256 bfd_udp_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1257 vlib_frame_t * f, int is_ipv6)
1259 u32 n_left_from, *from;
1260 bfd_input_trace_t *t0;
1261 bfd_main_t *bm = &bfd_main;
1263 from = vlib_frame_vector_args (f); /* array of buffer indices */
1264 n_left_from = f->n_vectors; /* number of buffer indices */
1266 while (n_left_from > 0)
1273 b0 = vlib_get_buffer (vm, bi0);
1275 bfd_session_t *bs = NULL;
1277 /* If this pkt is traced, snapshot the data */
1278 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1281 t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
1282 len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
1283 : sizeof (t0->data);
1285 clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), len);
1288 /* scan this bfd pkt. error0 is the counter index to bmp */
1292 error0 = bfd_udp6_scan (vm, rt, b0, &bs);
1296 error0 = bfd_udp4_scan (vm, rt, b0, &bs);
1298 b0->error = rt->errors[error0];
1300 next0 = BFD_UDP_INPUT_NEXT_NORMAL;
1301 if (BFD_UDP_ERROR_NONE == error0)
1304 * if everything went fine, check for poll bit, if present, re-use
1305 * the buffer and based on (now updated) session parameters, send
1306 * the final packet back
1308 const bfd_pkt_t *pkt = vlib_buffer_get_current (b0);
1309 if (bfd_pkt_get_poll (pkt))
1311 b0->current_data = 0;
1312 b0->current_length = 0;
1313 bfd_init_final_control_frame (vm, b0, bfd_udp_main.bfd_main, bs,
1317 vlib_node_increment_counter (vm, bfd_udp6_input_node.index,
1322 vlib_node_increment_counter (vm, bfd_udp4_input_node.index,
1325 const bfd_udp_session_t *bus = &bs->udp;
1326 ip_adjacency_t *adj = adj_get (bus->adj_index);
1327 switch (adj->lookup_next_index)
1329 case IP_LOOKUP_NEXT_ARP:
1330 next0 = BFD_UDP_INPUT_NEXT_REPLY_ARP;
1332 case IP_LOOKUP_NEXT_REWRITE:
1333 next0 = BFD_UDP_INPUT_NEXT_REPLY_REWRITE;
1335 case IP_LOOKUP_NEXT_MIDCHAIN:
1336 next0 = BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN;
1345 vlib_set_next_frame_buffer (vm, rt, next0, bi0);
1351 return f->n_vectors;
1355 bfd_udp4_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
1357 return bfd_udp_input (vm, rt, f, 0);
1361 * bfd input graph node declaration
1364 VLIB_REGISTER_NODE (bfd_udp4_input_node, static) = {
1365 .function = bfd_udp4_input,
1366 .name = "bfd-udp4-input",
1367 .vector_size = sizeof (u32),
1368 .type = VLIB_NODE_TYPE_INTERNAL,
1370 .n_errors = BFD_UDP_N_ERROR,
1371 .error_strings = bfd_udp_error_strings,
1373 .format_trace = bfd_input_format_trace,
1375 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1378 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1379 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
1380 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
1381 [BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip4-midchain",
1387 bfd_udp6_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
1389 return bfd_udp_input (vm, rt, f, 1);
1393 VLIB_REGISTER_NODE (bfd_udp6_input_node, static) = {
1394 .function = bfd_udp6_input,
1395 .name = "bfd-udp6-input",
1396 .vector_size = sizeof (u32),
1397 .type = VLIB_NODE_TYPE_INTERNAL,
1399 .n_errors = BFD_UDP_N_ERROR,
1400 .error_strings = bfd_udp_error_strings,
1402 .format_trace = bfd_input_format_trace,
1404 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1407 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1408 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
1409 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
1410 [BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip6-midchain",
1416 * Process a frame of bfd echo packets
1417 * Expect 1 packet / frame
1420 bfd_udp_echo_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1421 vlib_frame_t * f, int is_ipv6)
1423 u32 n_left_from, *from;
1424 bfd_input_trace_t *t0;
1425 bfd_main_t *bm = &bfd_main;
1427 from = vlib_frame_vector_args (f); /* array of buffer indices */
1428 n_left_from = f->n_vectors; /* number of buffer indices */
1430 while (n_left_from > 0)
1437 b0 = vlib_get_buffer (vm, bi0);
1439 /* If this pkt is traced, snapshot the data */
1440 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1443 t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
1444 len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
1445 : sizeof (t0->data);
1447 clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), len);
1451 if (bfd_consume_echo_pkt (vm, bfd_udp_main.bfd_main, b0))
1453 b0->error = rt->errors[BFD_UDP_ERROR_NONE];
1454 next0 = BFD_UDP_ECHO_INPUT_NEXT_NORMAL;
1458 /* loop back the packet */
1459 b0->error = rt->errors[BFD_UDP_ERROR_NONE];
1462 vlib_node_increment_counter (vm, bfd_udp_echo6_input_node.index,
1467 vlib_node_increment_counter (vm, bfd_udp_echo4_input_node.index,
1470 next0 = BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE;
1474 vlib_set_next_frame_buffer (vm, rt, next0, bi0);
1480 return f->n_vectors;
1484 bfd_udp_echo4_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1487 return bfd_udp_echo_input (vm, rt, f, 0);
1491 bfd_echo_input_format_trace (u8 * s, va_list * args)
1493 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1494 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1495 const bfd_udp_echo_input_trace_t *t =
1496 va_arg (*args, bfd_udp_echo_input_trace_t *);
1497 if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head))
1499 s = format (s, "BFD ECHO:\n");
1500 s = format (s, " data: %U", format_hexdump, t->data, t->len);
1507 * bfd input graph node declaration
1510 VLIB_REGISTER_NODE (bfd_udp_echo4_input_node, static) = {
1511 .function = bfd_udp_echo4_input,
1512 .name = "bfd-udp-echo4-input",
1513 .vector_size = sizeof (u32),
1514 .type = VLIB_NODE_TYPE_INTERNAL,
1516 .n_errors = BFD_UDP_ECHO_N_ERROR,
1517 .error_strings = bfd_udp_error_strings,
1519 .format_trace = bfd_echo_input_format_trace,
1521 .n_next_nodes = BFD_UDP_ECHO_INPUT_N_NEXT,
1524 [BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop",
1525 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
1526 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
1532 bfd_udp_echo6_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1535 return bfd_udp_echo_input (vm, rt, f, 1);
1539 VLIB_REGISTER_NODE (bfd_udp_echo6_input_node, static) = {
1540 .function = bfd_udp_echo6_input,
1541 .name = "bfd-udp-echo6-input",
1542 .vector_size = sizeof (u32),
1543 .type = VLIB_NODE_TYPE_INTERNAL,
1545 .n_errors = BFD_UDP_ECHO_N_ERROR,
1546 .error_strings = bfd_udp_echo_error_strings,
1548 .format_trace = bfd_echo_input_format_trace,
1550 .n_next_nodes = BFD_UDP_ECHO_INPUT_N_NEXT,
1553 [BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop",
1554 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
1555 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
1561 static clib_error_t *
1562 bfd_udp_sw_if_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_create)
1564 bfd_session_t **to_be_freed = NULL;
1565 bfd_udp_main_t *bum = &bfd_udp_main;
1566 BFD_DBG ("sw_if_add_del called, sw_if_index=%u, is_create=%u", sw_if_index,
1571 pool_foreach (bs, bfd_udp_main.bfd_main->sessions)
1573 if (bs->transport != BFD_TRANSPORT_UDP4 &&
1574 bs->transport != BFD_TRANSPORT_UDP6)
1578 if (bs->udp.key.sw_if_index != sw_if_index)
1582 vec_add1 (to_be_freed, bs);
1586 vec_foreach (bs, to_be_freed)
1588 vlib_log_notice (bum->log_class,
1589 "removal of sw_if_index=%u forces removal of bfd session "
1590 "with bs_idx=%u", sw_if_index, (*bs)->bs_idx);
1591 bfd_session_set_flags (vlib_get_main (), *bs, 0);
1592 bfd_udp_del_session_internal (vlib_get_main (), *bs);
1597 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (bfd_udp_sw_if_add_del);
1602 static clib_error_t *
1603 bfd_udp_init (vlib_main_t * vm)
1605 bfd_udp_main.udp4_sessions_count = 0;
1606 bfd_udp_main.udp6_sessions_count = 0;
1607 mhash_init (&bfd_udp_main.bfd_session_idx_by_bfd_key, sizeof (uword),
1608 sizeof (bfd_udp_key_t));
1609 bfd_udp_main.bfd_main = &bfd_main;
1610 bfd_udp_main.vnet_main = vnet_get_main ();
1611 vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip4-arp");
1613 bfd_udp_main.ip4_arp_idx = node->index;
1614 node = vlib_get_node_by_name (vm, (u8 *) "ip6-discover-neighbor");
1616 bfd_udp_main.ip6_ndp_idx = node->index;
1617 node = vlib_get_node_by_name (vm, (u8 *) "ip4-rewrite");
1619 bfd_udp_main.ip4_rewrite_idx = node->index;
1620 node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite");
1622 bfd_udp_main.ip6_rewrite_idx = node->index;
1623 node = vlib_get_node_by_name (vm, (u8 *) "ip4-midchain");
1625 bfd_udp_main.ip4_midchain_idx = node->index;
1626 node = vlib_get_node_by_name (vm, (u8 *) "ip6-midchain");
1628 bfd_udp_main.ip6_midchain_idx = node->index;
1630 bfd_udp_main.log_class = vlib_log_register_class ("bfd", "udp");
1631 vlib_log_debug (bfd_udp_main.log_class, "initialized");
1635 VLIB_INIT_FUNCTION (bfd_udp_init);
1638 * fd.io coding-style-patch-verification: ON
1641 * eval: (c-set-style "gnu")