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 <vpp/stats/stat_segment.h>
39 #include <vnet/bfd/bfd_debug.h>
40 #include <vnet/bfd/bfd_udp.h>
41 #include <vnet/bfd/bfd_main.h>
42 #include <vnet/bfd/bfd_api.h>
47 /* hashmap - bfd session index by bfd key - used for CLI/API lookup, where
48 * discriminator is unknown */
49 mhash_t bfd_session_idx_by_bfd_key;
50 /* convenience variable */
51 vnet_main_t *vnet_main;
52 /* flag indicating whether echo_source_sw_if_index holds a valid value */
53 int echo_source_is_set;
54 /* loopback interface used to get echo source ip */
55 u32 echo_source_sw_if_index;
56 /* node index of "ip4-arp" node */
58 /* node index of "ip6-discover-neighbor" node */
60 /* node index of "ip4-rewrite" node */
62 /* node index of "ip6-rewrite" node */
64 /* node index of "ip4-midchain" node */
66 /* node index of "ip6-midchain" node */
69 vlib_log_class_t log_class;
70 /* number of active udp4 sessions */
71 u32 udp4_sessions_count;
72 u32 udp4_sessions_count_stat_seg_entry;
73 /* number of active udp6 sessions */
74 u32 udp6_sessions_count;
75 u32 udp6_sessions_count_stat_seg_entry;
78 static vlib_node_registration_t bfd_udp4_input_node;
79 static vlib_node_registration_t bfd_udp6_input_node;
80 static vlib_node_registration_t bfd_udp_echo4_input_node;
81 static vlib_node_registration_t bfd_udp_echo6_input_node;
83 bfd_udp_main_t bfd_udp_main;
86 bfd_udp_update_stat_segment_entry (u32 entry, u64 value)
88 vlib_stat_segment_lock ();
89 stat_segment_set_state_counter (entry, value);
90 vlib_stat_segment_unlock ();
94 bfd_udp_set_echo_source (u32 sw_if_index)
96 vnet_sw_interface_t *sw_if =
97 vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main, sw_if_index);
100 bfd_udp_main.echo_source_sw_if_index = sw_if_index;
101 bfd_udp_main.echo_source_is_set = 1;
104 return VNET_API_ERROR_BFD_ENOENT;
108 bfd_udp_del_echo_source ()
110 bfd_udp_main.echo_source_sw_if_index = ~0;
111 bfd_udp_main.echo_source_is_set = 0;
116 bfd_udp_is_echo_available (bfd_transport_e transport)
118 if (!bfd_udp_main.echo_source_is_set)
120 BFD_DBG ("UDP echo source not set - echo not available");
124 * for the echo to work, we need a loopback interface with at least one
125 * address with netmask length at most 31 (ip4) or 127 (ip6) so that we can
126 * pick an unused address from that subnet
128 vnet_sw_interface_t *sw_if =
129 vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main,
130 bfd_udp_main.echo_source_sw_if_index);
131 if (sw_if && sw_if->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
133 if (BFD_TRANSPORT_UDP4 == transport)
135 ip4_main_t *im = &ip4_main;
136 ip_interface_address_t *ia = NULL;
138 foreach_ip_interface_address (&im->lookup_main, ia,
139 bfd_udp_main.echo_source_sw_if_index,
140 0 /* honor unnumbered */, ({
141 if (ia->address_length <= 31)
148 else if (BFD_TRANSPORT_UDP6 == transport)
150 ip6_main_t *im = &ip6_main;
151 ip_interface_address_t *ia = NULL;
153 foreach_ip_interface_address (&im->lookup_main, ia,
154 bfd_udp_main.echo_source_sw_if_index,
155 0 /* honor unnumbered */, ({
156 if (ia->address_length <= 127)
164 BFD_DBG ("No usable IP address for UDP echo - echo not available");
169 bfd_udp_bs_idx_to_sport (u32 bs_idx)
171 /* The source port MUST be in the range 49152 through 65535. The same UDP
172 * source port number MUST be used for all BFD Control packets associated
173 * with a particular session. The source port number SHOULD be unique among
174 * all BFD sessions on the system. If more than 16384 BFD sessions are
175 * simultaneously active, UDP source port numbers MAY be reused on
176 * multiple sessions, but the number of distinct uses of the same UDP
177 * source port number SHOULD be minimized.
179 return 49152 + bs_idx % (65535 - 49152 + 1);
183 bfd_udp_get_echo_src_ip4 (ip4_address_t * addr)
185 if (!bfd_udp_main.echo_source_is_set)
187 BFD_ERR ("cannot find ip4 address, echo source not set");
190 ip_interface_address_t *ia = NULL;
191 ip4_main_t *im = &ip4_main;
194 foreach_ip_interface_address (
195 &im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index,
196 0 /* honor unnumbered */, ({
198 ip_interface_address_get_address (&im->lookup_main, ia);
199 if (ia->address_length <= 31)
201 addr->as_u32 = clib_host_to_net_u32 (x->as_u32);
203 * flip the last bit to get a different address, might be network,
207 addr->as_u32 = clib_net_to_host_u32 (addr->as_u32);
212 BFD_ERR ("cannot find ip4 address, no usable address found");
217 bfd_udp_get_echo_src_ip6 (ip6_address_t * addr)
219 if (!bfd_udp_main.echo_source_is_set)
221 BFD_ERR ("cannot find ip6 address, echo source not set");
224 ip_interface_address_t *ia = NULL;
225 ip6_main_t *im = &ip6_main;
228 foreach_ip_interface_address (
229 &im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index,
230 0 /* honor unnumbered */, ({
232 ip_interface_address_get_address (&im->lookup_main, ia);
233 if (ia->address_length <= 127)
236 addr->as_u8[15] ^= 1; /* flip the last bit of the address */
241 BFD_ERR ("cannot find ip6 address, no usable address found");
246 bfd_udp_get_echo_source (int *is_set, u32 * sw_if_index,
247 int *have_usable_ip4, ip4_address_t * ip4,
248 int *have_usable_ip6, ip6_address_t * ip6)
250 if (bfd_udp_main.echo_source_is_set)
253 *sw_if_index = bfd_udp_main.echo_source_sw_if_index;
254 *have_usable_ip4 = bfd_udp_get_echo_src_ip4 (ip4);
255 *have_usable_ip6 = bfd_udp_get_echo_src_ip6 (ip6);
264 bfd_add_udp4_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs,
267 const bfd_udp_session_t *bus = &bs->udp;
268 const bfd_udp_key_t *key = &bus->key;
269 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
271 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
272 vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
273 vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
274 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
275 vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
281 ip4_udp_headers *headers = NULL;
282 vlib_buffer_advance (b, -sizeof (*headers));
283 headers = vlib_buffer_get_current (b);
284 clib_memset (headers, 0, sizeof (*headers));
285 headers->ip4.ip_version_and_header_length = 0x45;
286 headers->ip4.ttl = 255;
287 headers->ip4.protocol = IP_PROTOCOL_UDP;
288 headers->udp.src_port =
289 clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx));
293 if (!(rv = bfd_udp_get_echo_src_ip4 (&headers->ip4.src_address)))
297 headers->ip4.dst_address.as_u32 = key->local_addr.ip4.as_u32;
298 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo4);
302 headers->ip4.src_address.as_u32 = key->local_addr.ip4.as_u32;
303 headers->ip4.dst_address.as_u32 = key->peer_addr.ip4.as_u32;
304 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4);
307 /* fix ip length, checksum and udp length */
308 const u16 ip_length = vlib_buffer_length_in_chain (vm, b);
310 headers->ip4.length = clib_host_to_net_u16 (ip_length);
311 headers->ip4.checksum = ip4_header_checksum (&headers->ip4);
313 const u16 udp_length = ip_length - (sizeof (headers->ip4));
314 headers->udp.length = clib_host_to_net_u16 (udp_length);
319 bfd_add_udp6_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs,
322 const bfd_udp_session_t *bus = &bs->udp;
323 const bfd_udp_key_t *key = &bus->key;
324 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
326 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
327 vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
328 vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
329 vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
330 vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
336 ip6_udp_headers *headers = NULL;
337 vlib_buffer_advance (b, -sizeof (*headers));
338 headers = vlib_buffer_get_current (b);
339 clib_memset (headers, 0, sizeof (*headers));
340 headers->ip6.ip_version_traffic_class_and_flow_label =
341 clib_host_to_net_u32 (0x6 << 28);
342 headers->ip6.hop_limit = 255;
343 headers->ip6.protocol = IP_PROTOCOL_UDP;
344 headers->udp.src_port =
345 clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx));
349 if (!(rv = bfd_udp_get_echo_src_ip6 (&headers->ip6.src_address)))
353 clib_memcpy_fast (&headers->ip6.dst_address, &key->local_addr.ip6,
354 sizeof (headers->ip6.dst_address));
356 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo6);
360 clib_memcpy_fast (&headers->ip6.src_address, &key->local_addr.ip6,
361 sizeof (headers->ip6.src_address));
362 clib_memcpy_fast (&headers->ip6.dst_address, &key->peer_addr.ip6,
363 sizeof (headers->ip6.dst_address));
364 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd6);
367 /* fix ip payload length and udp length */
368 const u16 udp_length =
369 vlib_buffer_length_in_chain (vm, b) - (sizeof (headers->ip6));
370 headers->udp.length = clib_host_to_net_u16 (udp_length);
371 headers->ip6.payload_length = headers->udp.length;
373 /* IPv6 UDP checksum is mandatory */
375 headers->udp.checksum =
376 ip6_tcp_udp_icmp_compute_checksum (vm, b, &headers->ip6, &bogus);
378 if (headers->udp.checksum == 0)
380 headers->udp.checksum = 0xffff;
386 bfd_create_frame_to_next_node (vlib_main_t *vm, bfd_main_t *bm,
387 const bfd_session_t *bs, u32 bi, u32 next_node,
388 vlib_combined_counter_main_t *tx_counter)
390 vlib_frame_t *f = vlib_get_frame_to_node (vm, next_node);
391 u32 *to_next = vlib_frame_vector_args (f);
394 vlib_put_frame_to_node (vm, next_node, f);
395 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
396 vlib_increment_combined_counter (tx_counter, vm->thread_index, bs->bs_idx, 1,
397 vlib_buffer_length_in_chain (vm, b));
401 bfd_udp_calc_next_node (const struct bfd_session_s *bs, u32 * next_node)
403 vnet_main_t *vnm = vnet_get_main ();
404 const bfd_udp_session_t *bus = &bs->udp;
405 ip_adjacency_t *adj = adj_get (bus->adj_index);
407 /* don't try to send the buffer if the interface is not up */
408 if (!vnet_sw_interface_is_up (vnm, bus->key.sw_if_index))
411 switch (adj->lookup_next_index)
413 case IP_LOOKUP_NEXT_ARP:
414 switch (bs->transport)
416 case BFD_TRANSPORT_UDP4:
417 *next_node = bfd_udp_main.ip4_arp_idx;
419 case BFD_TRANSPORT_UDP6:
420 *next_node = bfd_udp_main.ip6_ndp_idx;
424 case IP_LOOKUP_NEXT_REWRITE:
425 switch (bs->transport)
427 case BFD_TRANSPORT_UDP4:
428 *next_node = bfd_udp_main.ip4_rewrite_idx;
430 case BFD_TRANSPORT_UDP6:
431 *next_node = bfd_udp_main.ip6_rewrite_idx;
435 case IP_LOOKUP_NEXT_MIDCHAIN:
436 switch (bs->transport)
438 case BFD_TRANSPORT_UDP4:
439 *next_node = bfd_udp_main.ip4_midchain_idx;
441 case BFD_TRANSPORT_UDP6:
442 *next_node = bfd_udp_main.ip6_midchain_idx;
454 bfd_transport_udp4 (vlib_main_t *vm, u32 bi, const struct bfd_session_s *bs,
458 int rv = bfd_udp_calc_next_node (bs, &next_node);
459 bfd_main_t *bm = bfd_udp_main.bfd_main;
462 bfd_create_frame_to_next_node (vm, bm, bs, bi, next_node,
463 is_echo ? &bm->tx_echo_counter :
470 bfd_transport_udp6 (vlib_main_t *vm, u32 bi, const struct bfd_session_s *bs,
474 int rv = bfd_udp_calc_next_node (bs, &next_node);
475 bfd_main_t *bm = bfd_udp_main.bfd_main;
478 bfd_create_frame_to_next_node (
479 vm, bfd_udp_main.bfd_main, bs, bi, next_node,
480 is_echo ? &bm->tx_echo_counter : &bm->tx_counter);
485 static bfd_session_t *
486 bfd_lookup_session (bfd_udp_main_t * bum, const bfd_udp_key_t * key)
488 uword *p = mhash_get (&bum->bfd_session_idx_by_bfd_key, key);
491 return bfd_find_session_by_idx (bum->bfd_main, *p);
497 bfd_udp_key_init (bfd_udp_key_t * key, u32 sw_if_index,
498 const ip46_address_t * local_addr,
499 const ip46_address_t * peer_addr)
501 clib_memset (key, 0, sizeof (*key));
502 key->sw_if_index = sw_if_index;
503 key->local_addr.as_u64[0] = local_addr->as_u64[0];
504 key->local_addr.as_u64[1] = local_addr->as_u64[1];
505 key->peer_addr.as_u64[0] = peer_addr->as_u64[0];
506 key->peer_addr.as_u64[1] = peer_addr->as_u64[1];
509 static vnet_api_error_t
510 bfd_udp_add_session_internal (vlib_main_t * vm, bfd_udp_main_t * bum,
511 u32 sw_if_index, u32 desired_min_tx_usec,
512 u32 required_min_rx_usec, u8 detect_mult,
513 const ip46_address_t * local_addr,
514 const ip46_address_t * peer_addr,
515 bfd_session_t ** bs_out)
517 /* get a pool entry and if we end up not needing it, give it back */
518 bfd_transport_e t = BFD_TRANSPORT_UDP4;
519 if (!ip46_address_is_ip4 (local_addr))
521 t = BFD_TRANSPORT_UDP6;
523 bfd_session_t *bs = bfd_get_session (bum->bfd_main, t);
526 return VNET_API_ERROR_BFD_EAGAIN;
528 bfd_udp_session_t *bus = &bs->udp;
529 clib_memset (bus, 0, sizeof (*bus));
530 bfd_udp_key_t *key = &bus->key;
531 bfd_udp_key_init (key, sw_if_index, local_addr, peer_addr);
532 const bfd_session_t *tmp = bfd_lookup_session (bum, key);
535 vlib_log_err (bum->log_class,
536 "duplicate bfd-udp session, existing bs_idx=%d",
538 bfd_put_session (bum->bfd_main, bs);
539 return VNET_API_ERROR_BFD_EEXIST;
541 mhash_set (&bum->bfd_session_idx_by_bfd_key, key, bs->bs_idx, NULL);
542 BFD_DBG ("session created, bs_idx=%u, sw_if_index=%d, local=%U, peer=%U",
543 bs->bs_idx, key->sw_if_index, format_ip46_address,
544 &key->local_addr, IP46_TYPE_ANY, format_ip46_address,
545 &key->peer_addr, IP46_TYPE_ANY);
546 vlib_log_info (bum->log_class, "create BFD session: %U",
547 format_bfd_session, bs);
548 const ip46_address_t *peer =
549 (vnet_sw_interface_is_p2p (vnet_get_main (), key->sw_if_index) ?
552 if (BFD_TRANSPORT_UDP4 == t)
554 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, VNET_LINK_IP4,
555 peer, key->sw_if_index);
556 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP4, VNET_LINK_IP4, %U, %d) "
558 format_ip46_address, peer, IP46_TYPE_ANY, key->sw_if_index,
560 ++bum->udp4_sessions_count;
561 bfd_udp_update_stat_segment_entry (
562 bum->udp4_sessions_count_stat_seg_entry, bum->udp4_sessions_count);
563 if (1 == bum->udp4_sessions_count)
565 udp_register_dst_port (vm, UDP_DST_PORT_bfd4,
566 bfd_udp4_input_node.index, 1);
567 udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo4,
568 bfd_udp_echo4_input_node.index, 1);
573 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6,
574 peer, key->sw_if_index);
575 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP6, VNET_LINK_IP6, %U, %d) "
577 format_ip46_address, peer, IP46_TYPE_ANY, key->sw_if_index,
579 ++bum->udp6_sessions_count;
580 bfd_udp_update_stat_segment_entry (
581 bum->udp6_sessions_count_stat_seg_entry, bum->udp6_sessions_count);
582 if (1 == bum->udp6_sessions_count)
584 udp_register_dst_port (vm, UDP_DST_PORT_bfd6,
585 bfd_udp6_input_node.index, 0);
586 udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo6,
587 bfd_udp_echo6_input_node.index, 0);
591 return bfd_session_set_params (bum->bfd_main, bs, desired_min_tx_usec,
592 required_min_rx_usec, detect_mult);
595 static vnet_api_error_t
596 bfd_udp_validate_api_input (u32 sw_if_index,
597 const ip46_address_t * local_addr,
598 const ip46_address_t * peer_addr)
600 bfd_udp_main_t *bum = &bfd_udp_main;
601 vnet_sw_interface_t *sw_if =
602 vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main, sw_if_index);
603 u8 local_ip_valid = 0;
604 ip_interface_address_t *ia = NULL;
607 vlib_log_err (bum->log_class,
608 "got NULL sw_if when getting interface by index %u",
610 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
612 if (ip46_address_is_ip4 (local_addr))
614 if (!ip46_address_is_ip4 (peer_addr))
616 vlib_log_err (bum->log_class,
617 "IP family mismatch (local is ipv4, peer is ipv6)");
618 return VNET_API_ERROR_INVALID_ARGUMENT;
620 ip4_main_t *im = &ip4_main;
623 foreach_ip_interface_address (
624 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
626 ip_interface_address_get_address (&im->lookup_main, ia);
627 if (x->as_u32 == local_addr->ip4.as_u32)
629 /* valid address for this interface */
638 if (ip46_address_is_ip4 (peer_addr))
640 vlib_log_err (bum->log_class,
641 "IP family mismatch (local is ipv6, peer is ipv4)");
642 return VNET_API_ERROR_INVALID_ARGUMENT;
645 if (ip6_address_is_link_local_unicast (&local_addr->ip6))
647 const ip6_address_t *ll_addr;
648 ll_addr = ip6_get_link_local_address (sw_if_index);
649 if (ll_addr && ip6_address_is_equal (ll_addr, &local_addr->ip6))
651 /* valid address for this interface */
657 ip6_main_t *im = &ip6_main;
659 foreach_ip_interface_address (
660 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
662 ip_interface_address_get_address (&im->lookup_main, ia);
663 if (local_addr->ip6.as_u64[0] == x->as_u64[0] &&
664 local_addr->ip6.as_u64[1] == x->as_u64[1])
666 /* valid address for this interface */
677 vlib_log_err (bum->log_class,
678 "local address %U not found on interface with index %u",
679 format_ip46_address, local_addr, IP46_TYPE_ANY,
681 return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
687 static vnet_api_error_t
688 bfd_udp_find_session_by_api_input (u32 sw_if_index,
689 const ip46_address_t * local_addr,
690 const ip46_address_t * peer_addr,
691 bfd_session_t ** bs_out)
693 vnet_api_error_t rv =
694 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
697 bfd_udp_main_t *bum = &bfd_udp_main;
699 bfd_udp_key_init (&key, sw_if_index, local_addr, peer_addr);
700 bfd_session_t *bs = bfd_lookup_session (bum, &key);
707 vlib_log_err (bum->log_class,
708 "BFD session not found, sw_if_index=%u, local=%U, peer=%U",
709 sw_if_index, format_ip46_address, local_addr,
710 IP46_TYPE_ANY, format_ip46_address, peer_addr,
712 return VNET_API_ERROR_BFD_ENOENT;
718 static vnet_api_error_t
719 bfd_api_verify_common (u32 sw_if_index, u32 desired_min_tx_usec,
720 u8 detect_mult, const ip46_address_t *local_addr,
721 const ip46_address_t *peer_addr)
723 bfd_udp_main_t *bum = &bfd_udp_main;
724 vnet_api_error_t rv =
725 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
732 vlib_log_err (bum->log_class, "detect_mult < 1");
733 return VNET_API_ERROR_INVALID_ARGUMENT;
735 if (desired_min_tx_usec < 1)
737 vlib_log_err (bum->log_class, "desired_min_tx_usec < 1");
738 return VNET_API_ERROR_INVALID_ARGUMENT;
744 bfd_udp_del_session_internal (vlib_main_t * vm, bfd_session_t * bs)
746 bfd_udp_main_t *bum = &bfd_udp_main;
747 BFD_DBG ("free bfd-udp session, bs_idx=%d", bs->bs_idx);
748 mhash_unset (&bum->bfd_session_idx_by_bfd_key, &bs->udp.key, NULL);
749 adj_unlock (bs->udp.adj_index);
750 switch (bs->transport)
752 case BFD_TRANSPORT_UDP4:
753 --bum->udp4_sessions_count;
754 bfd_udp_update_stat_segment_entry (
755 bum->udp4_sessions_count_stat_seg_entry, bum->udp4_sessions_count);
756 if (!bum->udp4_sessions_count)
758 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd4, 1);
759 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo4, 1);
762 case BFD_TRANSPORT_UDP6:
763 --bum->udp6_sessions_count;
764 bfd_udp_update_stat_segment_entry (
765 bum->udp6_sessions_count_stat_seg_entry, bum->udp6_sessions_count);
766 if (!bum->udp6_sessions_count)
768 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd6, 0);
769 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo6, 0);
773 bfd_put_session (bum->bfd_main, bs);
776 static vnet_api_error_t
777 bfd_udp_add_and_start_session (u32 sw_if_index,
778 const ip46_address_t *local_addr,
779 const ip46_address_t *peer_addr,
780 u32 desired_min_tx_usec,
781 u32 required_min_rx_usec, u8 detect_mult,
782 u8 is_authenticated, u32 conf_key_id,
785 bfd_session_t *bs = NULL;
788 rv = bfd_udp_add_session_internal (
789 vlib_get_main (), &bfd_udp_main, sw_if_index, desired_min_tx_usec,
790 required_min_rx_usec, detect_mult, local_addr, peer_addr, &bs);
792 if (!rv && is_authenticated)
794 rv = bfd_auth_activate (bs, conf_key_id, bfd_key_id,
795 0 /* is not delayed */);
798 bfd_udp_del_session_internal (vlib_get_main (), bs);
803 bfd_session_start (bfd_udp_main.bfd_main, bs);
810 bfd_udp_add_session (u32 sw_if_index, const ip46_address_t * local_addr,
811 const ip46_address_t * peer_addr,
812 u32 desired_min_tx_usec, u32 required_min_rx_usec,
813 u8 detect_mult, u8 is_authenticated, u32 conf_key_id,
816 bfd_main_t *bm = &bfd_main;
819 vnet_api_error_t rv = bfd_api_verify_common (
820 sw_if_index, desired_min_tx_usec, detect_mult, local_addr, peer_addr);
823 rv = bfd_udp_add_and_start_session (
824 sw_if_index, local_addr, peer_addr, desired_min_tx_usec,
825 required_min_rx_usec, detect_mult, is_authenticated, conf_key_id,
833 bfd_udp_upd_session (u32 sw_if_index, const ip46_address_t *local_addr,
834 const ip46_address_t *peer_addr, u32 desired_min_tx_usec,
835 u32 required_min_rx_usec, u8 detect_mult,
836 u8 is_authenticated, u32 conf_key_id, u8 bfd_key_id)
838 bfd_main_t *bm = &bfd_main;
841 vnet_api_error_t rv = bfd_api_verify_common (
842 sw_if_index, desired_min_tx_usec, detect_mult, local_addr, peer_addr);
845 bfd_session_t *bs = NULL;
847 rv = bfd_udp_find_session_by_api_input (sw_if_index, local_addr,
849 if (VNET_API_ERROR_BFD_ENOENT == rv)
850 rv = bfd_udp_add_and_start_session (
851 sw_if_index, local_addr, peer_addr, desired_min_tx_usec,
852 required_min_rx_usec, detect_mult, is_authenticated, conf_key_id,
855 rv = bfd_session_set_params (bfd_udp_main.bfd_main, bs,
856 desired_min_tx_usec, required_min_rx_usec,
865 bfd_udp_mod_session (u32 sw_if_index, const ip46_address_t *local_addr,
866 const ip46_address_t *peer_addr, u32 desired_min_tx_usec,
867 u32 required_min_rx_usec, u8 detect_mult)
869 bfd_session_t *bs = NULL;
870 bfd_main_t *bm = &bfd_main;
871 vnet_api_error_t error;
873 vnet_api_error_t rv =
874 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
882 error = bfd_session_set_params (bfd_udp_main.bfd_main, bs,
883 desired_min_tx_usec, required_min_rx_usec,
890 bfd_udp_del_session (u32 sw_if_index,
891 const ip46_address_t * local_addr,
892 const ip46_address_t * peer_addr)
894 bfd_session_t *bs = NULL;
895 bfd_main_t *bm = &bfd_main;
897 vnet_api_error_t rv =
898 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
905 bfd_udp_del_session_internal (vlib_get_main (), bs);
911 bfd_udp_session_set_flags (vlib_main_t * vm, u32 sw_if_index,
912 const ip46_address_t * local_addr,
913 const ip46_address_t * peer_addr, u8 admin_up_down)
915 bfd_session_t *bs = NULL;
916 bfd_main_t *bm = &bfd_main;
918 vnet_api_error_t rv =
919 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
926 bfd_session_set_flags (vm, bs, admin_up_down);
932 bfd_udp_auth_activate (u32 sw_if_index,
933 const ip46_address_t * local_addr,
934 const ip46_address_t * peer_addr,
935 u32 conf_key_id, u8 key_id, u8 is_delayed)
937 bfd_main_t *bm = &bfd_main;
939 vnet_api_error_t error;
941 bfd_session_t *bs = NULL;
942 vnet_api_error_t rv =
943 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
950 error = bfd_auth_activate (bs, conf_key_id, key_id, is_delayed);
956 bfd_udp_auth_deactivate (u32 sw_if_index,
957 const ip46_address_t * local_addr,
958 const ip46_address_t * peer_addr, u8 is_delayed)
960 bfd_main_t *bm = &bfd_main;
961 vnet_api_error_t error;
963 bfd_session_t *bs = NULL;
964 vnet_api_error_t rv =
965 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
972 error = bfd_auth_deactivate (bs, is_delayed);
979 BFD_UDP_INPUT_NEXT_NORMAL,
980 BFD_UDP_INPUT_NEXT_REPLY_ARP,
981 BFD_UDP_INPUT_NEXT_REPLY_REWRITE,
982 BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN,
983 BFD_UDP_INPUT_N_NEXT,
984 } bfd_udp_input_next_t;
986 /* Packet counters - BFD control frames */
987 #define foreach_bfd_udp_error(F) \
988 F (NONE, "good bfd packets (processed)") \
989 F (BAD, "invalid bfd packets")
991 #define F(sym, string) static char BFD_UDP_ERR_##sym##_STR[] = string;
992 foreach_bfd_udp_error (F);
995 static char *bfd_udp_error_strings[] = {
996 #define F(sym, string) BFD_UDP_ERR_##sym##_STR,
997 foreach_bfd_udp_error (F)
1003 #define F(sym, str) BFD_UDP_ERROR_##sym,
1004 foreach_bfd_udp_error (F)
1011 BFD_UDP_ECHO_INPUT_NEXT_NORMAL,
1012 BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP,
1013 BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE,
1014 BFD_UDP_ECHO_INPUT_N_NEXT,
1015 } bfd_udp_echo_input_next_t;
1017 /* Packet counters - BFD ECHO packets */
1018 #define foreach_bfd_udp_echo_error(F) \
1019 F (NONE, "good bfd echo packets (processed)") \
1020 F (BAD, "invalid bfd echo packets")
1022 #define F(sym, string) static char BFD_UDP_ECHO_ERR_##sym##_STR[] = string;
1023 foreach_bfd_udp_echo_error (F);
1026 static char *bfd_udp_echo_error_strings[] = {
1027 #define F(sym, string) BFD_UDP_ECHO_ERR_##sym##_STR,
1028 foreach_bfd_udp_echo_error (F)
1034 #define F(sym, str) BFD_UDP_ECHO_ERROR_##sym,
1035 foreach_bfd_udp_echo_error (F)
1037 BFD_UDP_ECHO_N_ERROR,
1038 } bfd_udp_echo_error_t;
1041 bfd_udp4_find_headers (vlib_buffer_t * b, ip4_header_t ** ip4,
1042 udp_header_t ** udp)
1044 /* sanity check first */
1045 const i32 start = vnet_buffer (b)->l3_hdr_offset;
1046 if (start < -(signed) sizeof (b->pre_data))
1048 BFD_ERR ("Start of ip header is before pre_data, ignoring");
1053 *ip4 = (ip4_header_t *) (b->data + start);
1054 if ((u8 *) * ip4 > (u8 *) vlib_buffer_get_current (b))
1056 BFD_ERR ("Start of ip header is beyond current data, ignoring");
1061 *udp = (udp_header_t *) ((*ip4) + 1);
1064 static bfd_udp_error_t
1065 bfd_udp4_verify_transport (const ip4_header_t * ip4,
1066 const udp_header_t * udp, const bfd_session_t * bs)
1068 const bfd_udp_session_t *bus = &bs->udp;
1069 const bfd_udp_key_t *key = &bus->key;
1070 if (ip4->src_address.as_u32 != key->peer_addr.ip4.as_u32)
1072 BFD_ERR ("IPv4 src addr mismatch, got %U, expected %U",
1073 format_ip4_address, ip4->src_address.as_u8, format_ip4_address,
1074 key->peer_addr.ip4.as_u8);
1075 return BFD_UDP_ERROR_BAD;
1077 if (ip4->dst_address.as_u32 != key->local_addr.ip4.as_u32)
1079 BFD_ERR ("IPv4 dst addr mismatch, got %U, expected %U",
1080 format_ip4_address, ip4->dst_address.as_u8, format_ip4_address,
1081 key->local_addr.ip4.as_u8);
1082 return BFD_UDP_ERROR_BAD;
1084 const u8 expected_ttl = 255;
1085 if (ip4->ttl != expected_ttl)
1087 BFD_ERR ("IPv4 unexpected TTL value %u, expected %u", ip4->ttl,
1089 return BFD_UDP_ERROR_BAD;
1091 if (clib_net_to_host_u16 (udp->src_port) < 49152)
1093 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
1096 return BFD_UDP_ERROR_NONE;
1106 bfd_rpc_update_session (vlib_main_t * vm, u32 bs_idx, const bfd_pkt_t * pkt)
1108 bfd_main_t *bm = &bfd_main;
1110 bfd_consume_pkt (vm, bm, pkt, bs_idx);
1114 static bfd_udp_error_t
1115 bfd_udp4_scan (vlib_main_t *vm, vlib_buffer_t *b, bfd_session_t **bs_out)
1117 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
1118 if (sizeof (*pkt) > b->current_length)
1121 ("Payload size %d too small to hold bfd packet of minimum size %d",
1122 b->current_length, sizeof (*pkt));
1123 return BFD_UDP_ERROR_BAD;
1127 bfd_udp4_find_headers (b, &ip4, &udp);
1130 BFD_ERR ("Couldn't find ip4 or udp header");
1131 return BFD_UDP_ERROR_BAD;
1133 const u32 udp_payload_length = udp->length - sizeof (*udp);
1134 if (pkt->head.length > udp_payload_length)
1137 ("BFD packet length is larger than udp payload length (%u > %u)",
1138 pkt->head.length, udp_payload_length);
1139 return BFD_UDP_ERROR_BAD;
1141 if (!bfd_verify_pkt_common (pkt))
1143 return BFD_UDP_ERROR_BAD;
1145 bfd_session_t *bs = NULL;
1148 BFD_DBG ("Looking up BFD session using discriminator %u",
1150 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
1155 clib_memset (&key, 0, sizeof (key));
1156 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
1157 key.local_addr.ip4.as_u32 = ip4->dst_address.as_u32;
1158 key.peer_addr.ip4.as_u32 = ip4->src_address.as_u32;
1159 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
1161 key.sw_if_index, format_ip4_address, key.local_addr.ip4.as_u8,
1162 format_ip4_address, key.peer_addr.ip4.as_u8);
1163 bs = bfd_lookup_session (&bfd_udp_main, &key);
1167 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
1168 return BFD_UDP_ERROR_BAD;
1170 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
1171 if (!bfd_verify_pkt_auth (vm, pkt, b->current_length, bs))
1173 BFD_ERR ("Packet verification failed, dropping packet");
1174 return BFD_UDP_ERROR_BAD;
1176 bfd_udp_error_t err;
1177 if (BFD_UDP_ERROR_NONE != (err = bfd_udp4_verify_transport (ip4, udp, bs)))
1181 bfd_rpc_update_session (vm, bs->bs_idx, pkt);
1183 return BFD_UDP_ERROR_NONE;
1187 bfd_udp6_find_headers (vlib_buffer_t * b, ip6_header_t ** ip6,
1188 udp_header_t ** udp)
1190 /* sanity check first */
1191 const i32 start = vnet_buffer (b)->l3_hdr_offset;
1192 if (start < -(signed) sizeof (b->pre_data))
1194 BFD_ERR ("Start of ip header is before pre_data, ignoring");
1199 *ip6 = (ip6_header_t *) (b->data + start);
1200 if ((u8 *) * ip6 > (u8 *) vlib_buffer_get_current (b))
1202 BFD_ERR ("Start of ip header is beyond current data, ignoring");
1207 if ((*ip6)->protocol != IP_PROTOCOL_UDP)
1209 BFD_ERR ("Unexpected protocol in IPv6 header '%u', expected '%u' (== "
1210 "IP_PROTOCOL_UDP)", (*ip6)->protocol, IP_PROTOCOL_UDP);
1215 *udp = (udp_header_t *) ((*ip6) + 1);
1218 static bfd_udp_error_t
1219 bfd_udp6_verify_transport (const ip6_header_t * ip6,
1220 const udp_header_t * udp, const bfd_session_t * bs)
1222 const bfd_udp_session_t *bus = &bs->udp;
1223 const bfd_udp_key_t *key = &bus->key;
1224 if (ip6->src_address.as_u64[0] != key->peer_addr.ip6.as_u64[0] &&
1225 ip6->src_address.as_u64[1] != key->peer_addr.ip6.as_u64[1])
1227 BFD_ERR ("IP src addr mismatch, got %U, expected %U",
1228 format_ip6_address, ip6, format_ip6_address,
1229 &key->peer_addr.ip6);
1230 return BFD_UDP_ERROR_BAD;
1232 if (ip6->dst_address.as_u64[0] != key->local_addr.ip6.as_u64[0] &&
1233 ip6->dst_address.as_u64[1] != key->local_addr.ip6.as_u64[1])
1235 BFD_ERR ("IP dst addr mismatch, got %U, expected %U",
1236 format_ip6_address, ip6, format_ip6_address,
1237 &key->local_addr.ip6);
1238 return BFD_UDP_ERROR_BAD;
1240 const u8 expected_hop_limit = 255;
1241 if (ip6->hop_limit != expected_hop_limit)
1243 BFD_ERR ("IPv6 unexpected hop-limit value %u, expected %u",
1244 ip6->hop_limit, expected_hop_limit);
1245 return BFD_UDP_ERROR_BAD;
1247 if (clib_net_to_host_u16 (udp->src_port) < 49152)
1249 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
1252 return BFD_UDP_ERROR_NONE;
1255 static bfd_udp_error_t
1256 bfd_udp6_scan (vlib_main_t *vm, vlib_buffer_t *b, bfd_session_t **bs_out)
1258 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
1259 if (sizeof (*pkt) > b->current_length)
1262 ("Payload size %d too small to hold bfd packet of minimum size %d",
1263 b->current_length, sizeof (*pkt));
1264 return BFD_UDP_ERROR_BAD;
1268 bfd_udp6_find_headers (b, &ip6, &udp);
1271 BFD_ERR ("Couldn't find ip6 or udp header");
1272 return BFD_UDP_ERROR_BAD;
1274 const u32 udp_payload_length = udp->length - sizeof (*udp);
1275 if (pkt->head.length > udp_payload_length)
1278 ("BFD packet length is larger than udp payload length (%u > %u)",
1279 pkt->head.length, udp_payload_length);
1280 return BFD_UDP_ERROR_BAD;
1282 if (!bfd_verify_pkt_common (pkt))
1284 return BFD_UDP_ERROR_BAD;
1286 bfd_session_t *bs = NULL;
1289 BFD_DBG ("Looking up BFD session using discriminator %u",
1291 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
1296 clib_memset (&key, 0, sizeof (key));
1297 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
1298 key.local_addr.ip6.as_u64[0] = ip6->dst_address.as_u64[0];
1299 key.local_addr.ip6.as_u64[1] = ip6->dst_address.as_u64[1];
1300 key.peer_addr.ip6.as_u64[0] = ip6->src_address.as_u64[0];
1301 key.peer_addr.ip6.as_u64[1] = ip6->src_address.as_u64[1];
1302 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
1304 key.sw_if_index, format_ip6_address, &key.local_addr,
1305 format_ip6_address, &key.peer_addr);
1306 bs = bfd_lookup_session (&bfd_udp_main, &key);
1310 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
1311 return BFD_UDP_ERROR_BAD;
1313 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
1314 if (!bfd_verify_pkt_auth (vm, pkt, b->current_length, bs))
1316 BFD_ERR ("Packet verification failed, dropping packet");
1317 return BFD_UDP_ERROR_BAD;
1319 bfd_udp_error_t err;
1320 if (BFD_UDP_ERROR_NONE != (err = bfd_udp6_verify_transport (ip6, udp, bs)))
1324 bfd_rpc_update_session (vm, bs->bs_idx, pkt);
1326 return BFD_UDP_ERROR_NONE;
1330 * Process a frame of bfd packets
1331 * Expect 1 packet / frame
1334 bfd_udp_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1335 vlib_frame_t * f, int is_ipv6)
1337 u32 n_left_from, *from;
1338 bfd_input_trace_t *t0;
1339 bfd_main_t *bm = &bfd_main;
1341 from = vlib_frame_vector_args (f); /* array of buffer indices */
1342 n_left_from = f->n_vectors; /* number of buffer indices */
1344 while (n_left_from > 0)
1351 b0 = vlib_get_buffer (vm, bi0);
1353 bfd_session_t *bs = NULL;
1355 /* If this pkt is traced, snapshot the data */
1356 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1359 t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
1360 len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
1361 : sizeof (t0->data);
1363 clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), len);
1366 /* scan this bfd pkt. error0 is the counter index to bmp */
1370 error0 = bfd_udp6_scan (vm, b0, &bs);
1374 error0 = bfd_udp4_scan (vm, b0, &bs);
1376 b0->error = rt->errors[error0];
1378 next0 = BFD_UDP_INPUT_NEXT_NORMAL;
1379 if (BFD_UDP_ERROR_NONE == error0)
1381 vlib_increment_combined_counter (
1382 &bm->rx_counter, vm->thread_index, bs->bs_idx, 1,
1383 vlib_buffer_length_in_chain (vm, b0));
1385 * if everything went fine, check for poll bit, if present, re-use
1386 * the buffer and based on (now updated) session parameters, send
1387 * the final packet back
1389 const bfd_pkt_t *pkt = vlib_buffer_get_current (b0);
1390 if (bfd_pkt_get_poll (pkt))
1392 b0->current_data = 0;
1393 b0->current_length = 0;
1394 bfd_init_final_control_frame (vm, b0, bs);
1397 vlib_node_increment_counter (vm, bfd_udp6_input_node.index,
1402 vlib_node_increment_counter (vm, bfd_udp4_input_node.index,
1405 const bfd_udp_session_t *bus = &bs->udp;
1406 ip_adjacency_t *adj = adj_get (bus->adj_index);
1407 switch (adj->lookup_next_index)
1409 case IP_LOOKUP_NEXT_ARP:
1410 next0 = BFD_UDP_INPUT_NEXT_REPLY_ARP;
1412 case IP_LOOKUP_NEXT_REWRITE:
1413 next0 = BFD_UDP_INPUT_NEXT_REPLY_REWRITE;
1415 case IP_LOOKUP_NEXT_MIDCHAIN:
1416 next0 = BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN;
1425 vlib_set_next_frame_buffer (vm, rt, next0, bi0);
1431 return f->n_vectors;
1435 bfd_udp4_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
1437 return bfd_udp_input (vm, rt, f, 0);
1441 * bfd input graph node declaration
1444 VLIB_REGISTER_NODE (bfd_udp4_input_node, static) = {
1445 .function = bfd_udp4_input,
1446 .name = "bfd-udp4-input",
1447 .vector_size = sizeof (u32),
1448 .type = VLIB_NODE_TYPE_INTERNAL,
1450 .n_errors = BFD_UDP_N_ERROR,
1451 .error_strings = bfd_udp_error_strings,
1453 .format_trace = bfd_input_format_trace,
1455 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1458 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1459 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
1460 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
1461 [BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip4-midchain",
1467 bfd_udp6_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
1469 return bfd_udp_input (vm, rt, f, 1);
1473 VLIB_REGISTER_NODE (bfd_udp6_input_node, static) = {
1474 .function = bfd_udp6_input,
1475 .name = "bfd-udp6-input",
1476 .vector_size = sizeof (u32),
1477 .type = VLIB_NODE_TYPE_INTERNAL,
1479 .n_errors = BFD_UDP_N_ERROR,
1480 .error_strings = bfd_udp_error_strings,
1482 .format_trace = bfd_input_format_trace,
1484 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1487 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1488 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
1489 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
1490 [BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip6-midchain",
1496 * Process a frame of bfd echo packets
1497 * Expect 1 packet / frame
1500 bfd_udp_echo_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1501 vlib_frame_t * f, int is_ipv6)
1503 u32 n_left_from, *from;
1504 bfd_input_trace_t *t0;
1505 bfd_main_t *bm = &bfd_main;
1507 from = vlib_frame_vector_args (f); /* array of buffer indices */
1508 n_left_from = f->n_vectors; /* number of buffer indices */
1510 while (n_left_from > 0)
1517 b0 = vlib_get_buffer (vm, bi0);
1519 /* If this pkt is traced, snapshot the data */
1520 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1523 t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
1524 len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
1525 : sizeof (t0->data);
1527 clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), len);
1530 bfd_session_t *bs = NULL;
1532 if ((bs = bfd_consume_echo_pkt (vm, bfd_udp_main.bfd_main, b0)))
1534 b0->error = rt->errors[BFD_UDP_ERROR_NONE];
1535 next0 = BFD_UDP_ECHO_INPUT_NEXT_NORMAL;
1539 /* loop back the packet */
1540 b0->error = rt->errors[BFD_UDP_ERROR_NONE];
1543 vlib_node_increment_counter (vm, bfd_udp_echo6_input_node.index,
1548 vlib_node_increment_counter (vm, bfd_udp_echo4_input_node.index,
1551 next0 = BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE;
1558 vlib_increment_combined_counter (
1559 &bm->rx_echo_counter, vm->thread_index, bs->bs_idx, 1,
1560 vlib_buffer_length_in_chain (vm, b0));
1563 vlib_set_next_frame_buffer (vm, rt, next0, bi0);
1569 return f->n_vectors;
1573 bfd_udp_echo4_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1576 return bfd_udp_echo_input (vm, rt, f, 0);
1580 bfd_echo_input_format_trace (u8 * s, va_list * args)
1582 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1583 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1584 const bfd_udp_echo_input_trace_t *t =
1585 va_arg (*args, bfd_udp_echo_input_trace_t *);
1586 if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head))
1588 s = format (s, "BFD ECHO:\n");
1589 s = format (s, " data: %U", format_hexdump, t->data, t->len);
1596 * bfd input graph node declaration
1599 VLIB_REGISTER_NODE (bfd_udp_echo4_input_node, static) = {
1600 .function = bfd_udp_echo4_input,
1601 .name = "bfd-udp-echo4-input",
1602 .vector_size = sizeof (u32),
1603 .type = VLIB_NODE_TYPE_INTERNAL,
1605 .n_errors = BFD_UDP_ECHO_N_ERROR,
1606 .error_strings = bfd_udp_error_strings,
1608 .format_trace = bfd_echo_input_format_trace,
1610 .n_next_nodes = BFD_UDP_ECHO_INPUT_N_NEXT,
1613 [BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop",
1614 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
1615 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
1621 bfd_udp_echo6_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1624 return bfd_udp_echo_input (vm, rt, f, 1);
1628 VLIB_REGISTER_NODE (bfd_udp_echo6_input_node, static) = {
1629 .function = bfd_udp_echo6_input,
1630 .name = "bfd-udp-echo6-input",
1631 .vector_size = sizeof (u32),
1632 .type = VLIB_NODE_TYPE_INTERNAL,
1634 .n_errors = BFD_UDP_ECHO_N_ERROR,
1635 .error_strings = bfd_udp_echo_error_strings,
1637 .format_trace = bfd_echo_input_format_trace,
1639 .n_next_nodes = BFD_UDP_ECHO_INPUT_N_NEXT,
1642 [BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop",
1643 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
1644 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
1650 static clib_error_t *
1651 bfd_udp_sw_if_add_del (CLIB_UNUSED (vnet_main_t *vnm), u32 sw_if_index,
1654 u32 *to_be_freed = NULL;
1655 bfd_udp_main_t *bum = &bfd_udp_main;
1656 BFD_DBG ("sw_if_add_del called, sw_if_index=%u, is_create=%u", sw_if_index,
1661 pool_foreach (bs, bum->bfd_main->sessions)
1663 if (bs->transport != BFD_TRANSPORT_UDP4 &&
1664 bs->transport != BFD_TRANSPORT_UDP6)
1668 if (bs->udp.key.sw_if_index != sw_if_index)
1672 vec_add1 (to_be_freed, bs->bs_idx);
1676 vec_foreach (bs_idx, to_be_freed)
1678 bfd_session_t *bs = pool_elt_at_index (bum->bfd_main->sessions, *bs_idx);
1679 vlib_log_notice (bum->log_class,
1680 "removal of sw_if_index=%u forces removal of bfd "
1681 "session with bs_idx=%u",
1682 sw_if_index, bs->bs_idx);
1683 bfd_session_set_flags (vlib_get_main (), bs, 0);
1684 bfd_udp_del_session_internal (vlib_get_main (), bs);
1689 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (bfd_udp_sw_if_add_del);
1692 bfd_udp_stats_init (bfd_udp_main_t *bum)
1694 const char *name4 = "/bfd/udp4/sessions";
1695 bum->udp4_sessions_count_stat_seg_entry =
1696 stat_segment_new_entry ((u8 *) name4, STAT_DIR_TYPE_SCALAR_INDEX);
1698 stat_segment_set_state_counter (bum->udp4_sessions_count_stat_seg_entry, 0);
1699 if (~0 == bum->udp4_sessions_count_stat_seg_entry)
1701 return clib_error_return (
1702 0, "Could not create stat segment entry for %s", name4);
1704 const char *name6 = "/bfd/udp6/sessions";
1705 bum->udp6_sessions_count_stat_seg_entry =
1706 stat_segment_new_entry ((u8 *) name6, STAT_DIR_TYPE_SCALAR_INDEX);
1708 if (~0 == bum->udp6_sessions_count_stat_seg_entry)
1710 return clib_error_return (
1711 0, "Could not create stat segment entry for %s", name6);
1720 static clib_error_t *
1721 bfd_udp_init (vlib_main_t * vm)
1723 bfd_udp_main.udp4_sessions_count = 0;
1724 bfd_udp_main.udp6_sessions_count = 0;
1725 mhash_init (&bfd_udp_main.bfd_session_idx_by_bfd_key, sizeof (uword),
1726 sizeof (bfd_udp_key_t));
1727 bfd_udp_main.bfd_main = &bfd_main;
1728 bfd_udp_main.vnet_main = vnet_get_main ();
1729 vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip4-arp");
1731 bfd_udp_main.ip4_arp_idx = node->index;
1732 node = vlib_get_node_by_name (vm, (u8 *) "ip6-discover-neighbor");
1734 bfd_udp_main.ip6_ndp_idx = node->index;
1735 node = vlib_get_node_by_name (vm, (u8 *) "ip4-rewrite");
1737 bfd_udp_main.ip4_rewrite_idx = node->index;
1738 node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite");
1740 bfd_udp_main.ip6_rewrite_idx = node->index;
1741 node = vlib_get_node_by_name (vm, (u8 *) "ip4-midchain");
1743 bfd_udp_main.ip4_midchain_idx = node->index;
1744 node = vlib_get_node_by_name (vm, (u8 *) "ip6-midchain");
1746 bfd_udp_main.ip6_midchain_idx = node->index;
1748 bfd_udp_stats_init (&bfd_udp_main);
1750 bfd_udp_main.log_class = vlib_log_register_class ("bfd", "udp");
1751 vlib_log_debug (bfd_udp_main.log_class, "initialized");
1755 VLIB_INIT_FUNCTION (bfd_udp_init);
1758 * fd.io coding-style-patch-verification: ON
1761 * eval: (c-set-style "gnu")