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 bus->adj_index = ADJ_INDEX_INVALID;
531 bfd_udp_key_t *key = &bus->key;
532 bfd_udp_key_init (key, sw_if_index, local_addr, peer_addr);
533 const bfd_session_t *tmp = bfd_lookup_session (bum, key);
536 vlib_log_err (bum->log_class,
537 "duplicate bfd-udp session, existing bs_idx=%d",
539 bfd_put_session (bum->bfd_main, bs);
540 return VNET_API_ERROR_BFD_EEXIST;
542 mhash_set (&bum->bfd_session_idx_by_bfd_key, key, bs->bs_idx, NULL);
543 BFD_DBG ("session created, bs_idx=%u, sw_if_index=%d, local=%U, peer=%U",
544 bs->bs_idx, key->sw_if_index, format_ip46_address,
545 &key->local_addr, IP46_TYPE_ANY, format_ip46_address,
546 &key->peer_addr, IP46_TYPE_ANY);
547 vlib_log_info (bum->log_class, "create BFD session: %U",
548 format_bfd_session, bs);
549 const ip46_address_t *peer =
550 (vnet_sw_interface_is_p2p (vnet_get_main (), key->sw_if_index) ?
553 if (BFD_TRANSPORT_UDP4 == t)
555 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, VNET_LINK_IP4,
556 peer, key->sw_if_index);
557 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP4, VNET_LINK_IP4, %U, %d) "
559 format_ip46_address, peer, IP46_TYPE_ANY, key->sw_if_index,
561 ++bum->udp4_sessions_count;
562 bfd_udp_update_stat_segment_entry (
563 bum->udp4_sessions_count_stat_seg_entry, bum->udp4_sessions_count);
564 if (1 == bum->udp4_sessions_count)
566 udp_register_dst_port (vm, UDP_DST_PORT_bfd4,
567 bfd_udp4_input_node.index, 1);
568 udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo4,
569 bfd_udp_echo4_input_node.index, 1);
574 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6,
575 peer, key->sw_if_index);
576 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP6, VNET_LINK_IP6, %U, %d) "
578 format_ip46_address, peer, IP46_TYPE_ANY, key->sw_if_index,
580 ++bum->udp6_sessions_count;
581 bfd_udp_update_stat_segment_entry (
582 bum->udp6_sessions_count_stat_seg_entry, bum->udp6_sessions_count);
583 if (1 == bum->udp6_sessions_count)
585 udp_register_dst_port (vm, UDP_DST_PORT_bfd6,
586 bfd_udp6_input_node.index, 0);
587 udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo6,
588 bfd_udp_echo6_input_node.index, 0);
592 return bfd_session_set_params (bum->bfd_main, bs, desired_min_tx_usec,
593 required_min_rx_usec, detect_mult);
596 static vnet_api_error_t
597 bfd_udp_validate_api_input (u32 sw_if_index,
598 const ip46_address_t * local_addr,
599 const ip46_address_t * peer_addr)
601 bfd_udp_main_t *bum = &bfd_udp_main;
602 vnet_sw_interface_t *sw_if =
603 vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main, sw_if_index);
604 u8 local_ip_valid = 0;
605 ip_interface_address_t *ia = NULL;
608 vlib_log_err (bum->log_class,
609 "got NULL sw_if when getting interface by index %u",
611 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
613 if (ip46_address_is_ip4 (local_addr))
615 if (!ip46_address_is_ip4 (peer_addr))
617 vlib_log_err (bum->log_class,
618 "IP family mismatch (local is ipv4, peer is ipv6)");
619 return VNET_API_ERROR_INVALID_ARGUMENT;
621 ip4_main_t *im = &ip4_main;
624 foreach_ip_interface_address (
625 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
627 ip_interface_address_get_address (&im->lookup_main, ia);
628 if (x->as_u32 == local_addr->ip4.as_u32)
630 /* valid address for this interface */
639 if (ip46_address_is_ip4 (peer_addr))
641 vlib_log_err (bum->log_class,
642 "IP family mismatch (local is ipv6, peer is ipv4)");
643 return VNET_API_ERROR_INVALID_ARGUMENT;
646 if (ip6_address_is_link_local_unicast (&local_addr->ip6))
648 const ip6_address_t *ll_addr;
649 ll_addr = ip6_get_link_local_address (sw_if_index);
650 if (ll_addr && ip6_address_is_equal (ll_addr, &local_addr->ip6))
652 /* valid address for this interface */
658 ip6_main_t *im = &ip6_main;
660 foreach_ip_interface_address (
661 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
663 ip_interface_address_get_address (&im->lookup_main, ia);
664 if (local_addr->ip6.as_u64[0] == x->as_u64[0] &&
665 local_addr->ip6.as_u64[1] == x->as_u64[1])
667 /* valid address for this interface */
678 vlib_log_err (bum->log_class,
679 "local address %U not found on interface with index %u",
680 format_ip46_address, local_addr, IP46_TYPE_ANY,
682 return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
688 static vnet_api_error_t
689 bfd_udp_find_session_by_api_input (u32 sw_if_index,
690 const ip46_address_t * local_addr,
691 const ip46_address_t * peer_addr,
692 bfd_session_t ** bs_out)
694 vnet_api_error_t rv =
695 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
698 bfd_udp_main_t *bum = &bfd_udp_main;
700 bfd_udp_key_init (&key, sw_if_index, local_addr, peer_addr);
701 bfd_session_t *bs = bfd_lookup_session (bum, &key);
708 vlib_log_err (bum->log_class,
709 "BFD session not found, sw_if_index=%u, local=%U, peer=%U",
710 sw_if_index, format_ip46_address, local_addr,
711 IP46_TYPE_ANY, format_ip46_address, peer_addr,
713 return VNET_API_ERROR_BFD_ENOENT;
719 static vnet_api_error_t
720 bfd_api_verify_common (u32 sw_if_index, u32 desired_min_tx_usec,
721 u8 detect_mult, const ip46_address_t *local_addr,
722 const ip46_address_t *peer_addr)
724 bfd_udp_main_t *bum = &bfd_udp_main;
725 vnet_api_error_t rv =
726 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
733 vlib_log_err (bum->log_class, "detect_mult < 1");
734 return VNET_API_ERROR_INVALID_ARGUMENT;
736 if (desired_min_tx_usec < 1)
738 vlib_log_err (bum->log_class, "desired_min_tx_usec < 1");
739 return VNET_API_ERROR_INVALID_ARGUMENT;
745 bfd_udp_del_session_internal (vlib_main_t * vm, bfd_session_t * bs)
747 bfd_udp_main_t *bum = &bfd_udp_main;
748 BFD_DBG ("free bfd-udp session, bs_idx=%d", bs->bs_idx);
749 bfd_session_stop (bum->bfd_main, bs);
750 mhash_unset (&bum->bfd_session_idx_by_bfd_key, &bs->udp.key, NULL);
751 adj_unlock (bs->udp.adj_index);
752 switch (bs->transport)
754 case BFD_TRANSPORT_UDP4:
755 --bum->udp4_sessions_count;
756 bfd_udp_update_stat_segment_entry (
757 bum->udp4_sessions_count_stat_seg_entry, bum->udp4_sessions_count);
758 if (!bum->udp4_sessions_count)
760 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd4, 1);
761 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo4, 1);
764 case BFD_TRANSPORT_UDP6:
765 --bum->udp6_sessions_count;
766 bfd_udp_update_stat_segment_entry (
767 bum->udp6_sessions_count_stat_seg_entry, bum->udp6_sessions_count);
768 if (!bum->udp6_sessions_count)
770 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd6, 0);
771 udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo6, 0);
775 bfd_put_session (bum->bfd_main, bs);
778 static vnet_api_error_t
779 bfd_udp_add_and_start_session (u32 sw_if_index,
780 const ip46_address_t *local_addr,
781 const ip46_address_t *peer_addr,
782 u32 desired_min_tx_usec,
783 u32 required_min_rx_usec, u8 detect_mult,
784 u8 is_authenticated, u32 conf_key_id,
787 bfd_session_t *bs = NULL;
790 rv = bfd_udp_add_session_internal (
791 vlib_get_main (), &bfd_udp_main, sw_if_index, desired_min_tx_usec,
792 required_min_rx_usec, detect_mult, local_addr, peer_addr, &bs);
794 if (!rv && is_authenticated)
796 rv = bfd_auth_activate (bs, conf_key_id, bfd_key_id,
797 0 /* is not delayed */);
800 bfd_udp_del_session_internal (vlib_get_main (), bs);
805 bfd_session_start (bfd_udp_main.bfd_main, bs);
812 bfd_udp_add_session (u32 sw_if_index, const ip46_address_t * local_addr,
813 const ip46_address_t * peer_addr,
814 u32 desired_min_tx_usec, u32 required_min_rx_usec,
815 u8 detect_mult, u8 is_authenticated, u32 conf_key_id,
818 bfd_main_t *bm = &bfd_main;
821 vnet_api_error_t rv = bfd_api_verify_common (
822 sw_if_index, desired_min_tx_usec, detect_mult, local_addr, peer_addr);
825 rv = bfd_udp_add_and_start_session (
826 sw_if_index, local_addr, peer_addr, desired_min_tx_usec,
827 required_min_rx_usec, detect_mult, is_authenticated, conf_key_id,
835 bfd_udp_upd_session (u32 sw_if_index, const ip46_address_t *local_addr,
836 const ip46_address_t *peer_addr, u32 desired_min_tx_usec,
837 u32 required_min_rx_usec, u8 detect_mult,
838 u8 is_authenticated, u32 conf_key_id, u8 bfd_key_id)
840 bfd_main_t *bm = &bfd_main;
843 vnet_api_error_t rv = bfd_api_verify_common (
844 sw_if_index, desired_min_tx_usec, detect_mult, local_addr, peer_addr);
847 bfd_session_t *bs = NULL;
849 rv = bfd_udp_find_session_by_api_input (sw_if_index, local_addr,
851 if (VNET_API_ERROR_BFD_ENOENT == rv)
852 rv = bfd_udp_add_and_start_session (
853 sw_if_index, local_addr, peer_addr, desired_min_tx_usec,
854 required_min_rx_usec, detect_mult, is_authenticated, conf_key_id,
857 rv = bfd_session_set_params (bfd_udp_main.bfd_main, bs,
858 desired_min_tx_usec, required_min_rx_usec,
867 bfd_udp_mod_session (u32 sw_if_index, const ip46_address_t *local_addr,
868 const ip46_address_t *peer_addr, u32 desired_min_tx_usec,
869 u32 required_min_rx_usec, u8 detect_mult)
871 bfd_session_t *bs = NULL;
872 bfd_main_t *bm = &bfd_main;
873 vnet_api_error_t error;
875 vnet_api_error_t rv =
876 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
884 error = bfd_session_set_params (bfd_udp_main.bfd_main, bs,
885 desired_min_tx_usec, required_min_rx_usec,
892 bfd_udp_del_session (u32 sw_if_index,
893 const ip46_address_t * local_addr,
894 const ip46_address_t * peer_addr)
896 bfd_session_t *bs = NULL;
897 bfd_main_t *bm = &bfd_main;
899 vnet_api_error_t rv =
900 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
907 bfd_udp_del_session_internal (vlib_get_main (), bs);
913 bfd_udp_session_set_flags (vlib_main_t * vm, u32 sw_if_index,
914 const ip46_address_t * local_addr,
915 const ip46_address_t * peer_addr, u8 admin_up_down)
917 bfd_session_t *bs = NULL;
918 bfd_main_t *bm = &bfd_main;
920 vnet_api_error_t rv =
921 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
928 bfd_session_set_flags (vm, bs, admin_up_down);
934 bfd_udp_auth_activate (u32 sw_if_index,
935 const ip46_address_t * local_addr,
936 const ip46_address_t * peer_addr,
937 u32 conf_key_id, u8 key_id, u8 is_delayed)
939 bfd_main_t *bm = &bfd_main;
941 vnet_api_error_t error;
943 bfd_session_t *bs = NULL;
944 vnet_api_error_t rv =
945 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
952 error = bfd_auth_activate (bs, conf_key_id, key_id, is_delayed);
958 bfd_udp_auth_deactivate (u32 sw_if_index,
959 const ip46_address_t * local_addr,
960 const ip46_address_t * peer_addr, u8 is_delayed)
962 bfd_main_t *bm = &bfd_main;
963 vnet_api_error_t error;
965 bfd_session_t *bs = NULL;
966 vnet_api_error_t rv =
967 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
974 error = bfd_auth_deactivate (bs, is_delayed);
981 BFD_UDP_INPUT_NEXT_NORMAL,
982 BFD_UDP_INPUT_NEXT_REPLY_ARP,
983 BFD_UDP_INPUT_NEXT_REPLY_REWRITE,
984 BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN,
985 BFD_UDP_INPUT_N_NEXT,
986 } bfd_udp_input_next_t;
988 /* Packet counters - BFD control frames */
989 #define foreach_bfd_udp_error(F) \
990 F (NONE, "good bfd packets (processed)") \
991 F (BAD, "invalid bfd packets")
993 #define F(sym, string) static char BFD_UDP_ERR_##sym##_STR[] = string;
994 foreach_bfd_udp_error (F);
997 static char *bfd_udp_error_strings[] = {
998 #define F(sym, string) BFD_UDP_ERR_##sym##_STR,
999 foreach_bfd_udp_error (F)
1005 #define F(sym, str) BFD_UDP_ERROR_##sym,
1006 foreach_bfd_udp_error (F)
1013 BFD_UDP_ECHO_INPUT_NEXT_NORMAL,
1014 BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP,
1015 BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE,
1016 BFD_UDP_ECHO_INPUT_N_NEXT,
1017 } bfd_udp_echo_input_next_t;
1019 /* Packet counters - BFD ECHO packets */
1020 #define foreach_bfd_udp_echo_error(F) \
1021 F (NONE, "good bfd echo packets (processed)") \
1022 F (BAD, "invalid bfd echo packets")
1024 #define F(sym, string) static char BFD_UDP_ECHO_ERR_##sym##_STR[] = string;
1025 foreach_bfd_udp_echo_error (F);
1028 static char *bfd_udp_echo_error_strings[] = {
1029 #define F(sym, string) BFD_UDP_ECHO_ERR_##sym##_STR,
1030 foreach_bfd_udp_echo_error (F)
1036 #define F(sym, str) BFD_UDP_ECHO_ERROR_##sym,
1037 foreach_bfd_udp_echo_error (F)
1039 BFD_UDP_ECHO_N_ERROR,
1040 } bfd_udp_echo_error_t;
1043 bfd_udp4_find_headers (vlib_buffer_t * b, ip4_header_t ** ip4,
1044 udp_header_t ** udp)
1046 /* sanity check first */
1047 const i32 start = vnet_buffer (b)->l3_hdr_offset;
1048 if (start < -(signed) sizeof (b->pre_data))
1050 BFD_ERR ("Start of ip header is before pre_data, ignoring");
1055 *ip4 = (ip4_header_t *) (b->data + start);
1056 if ((u8 *) * ip4 > (u8 *) vlib_buffer_get_current (b))
1058 BFD_ERR ("Start of ip header is beyond current data, ignoring");
1063 *udp = (udp_header_t *) ((*ip4) + 1);
1066 static bfd_udp_error_t
1067 bfd_udp4_verify_transport (const ip4_header_t * ip4,
1068 const udp_header_t * udp, const bfd_session_t * bs)
1070 const bfd_udp_session_t *bus = &bs->udp;
1071 const bfd_udp_key_t *key = &bus->key;
1072 if (ip4->src_address.as_u32 != key->peer_addr.ip4.as_u32)
1074 BFD_ERR ("IPv4 src addr mismatch, got %U, expected %U",
1075 format_ip4_address, ip4->src_address.as_u8, format_ip4_address,
1076 key->peer_addr.ip4.as_u8);
1077 return BFD_UDP_ERROR_BAD;
1079 if (ip4->dst_address.as_u32 != key->local_addr.ip4.as_u32)
1081 BFD_ERR ("IPv4 dst addr mismatch, got %U, expected %U",
1082 format_ip4_address, ip4->dst_address.as_u8, format_ip4_address,
1083 key->local_addr.ip4.as_u8);
1084 return BFD_UDP_ERROR_BAD;
1086 const u8 expected_ttl = 255;
1087 if (ip4->ttl != expected_ttl)
1089 BFD_ERR ("IPv4 unexpected TTL value %u, expected %u", ip4->ttl,
1091 return BFD_UDP_ERROR_BAD;
1093 if (clib_net_to_host_u16 (udp->src_port) < 49152)
1095 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
1098 return BFD_UDP_ERROR_NONE;
1108 bfd_rpc_update_session (vlib_main_t * vm, u32 bs_idx, const bfd_pkt_t * pkt)
1110 bfd_main_t *bm = &bfd_main;
1112 bfd_consume_pkt (vm, bm, pkt, bs_idx);
1116 static bfd_udp_error_t
1117 bfd_udp4_scan (vlib_main_t *vm, vlib_buffer_t *b, bfd_session_t **bs_out)
1119 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
1120 if (sizeof (*pkt) > b->current_length)
1123 ("Payload size %d too small to hold bfd packet of minimum size %d",
1124 b->current_length, sizeof (*pkt));
1125 return BFD_UDP_ERROR_BAD;
1129 bfd_udp4_find_headers (b, &ip4, &udp);
1132 BFD_ERR ("Couldn't find ip4 or udp header");
1133 return BFD_UDP_ERROR_BAD;
1135 const u32 udp_payload_length = udp->length - sizeof (*udp);
1136 if (pkt->head.length > udp_payload_length)
1139 ("BFD packet length is larger than udp payload length (%u > %u)",
1140 pkt->head.length, udp_payload_length);
1141 return BFD_UDP_ERROR_BAD;
1143 if (!bfd_verify_pkt_common (pkt))
1145 return BFD_UDP_ERROR_BAD;
1147 bfd_session_t *bs = NULL;
1150 BFD_DBG ("Looking up BFD session using discriminator %u",
1152 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
1157 clib_memset (&key, 0, sizeof (key));
1158 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
1159 key.local_addr.ip4.as_u32 = ip4->dst_address.as_u32;
1160 key.peer_addr.ip4.as_u32 = ip4->src_address.as_u32;
1161 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
1163 key.sw_if_index, format_ip4_address, key.local_addr.ip4.as_u8,
1164 format_ip4_address, key.peer_addr.ip4.as_u8);
1165 bs = bfd_lookup_session (&bfd_udp_main, &key);
1169 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
1170 return BFD_UDP_ERROR_BAD;
1172 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
1173 if (!bfd_verify_pkt_auth (vm, pkt, b->current_length, bs))
1175 BFD_ERR ("Packet verification failed, dropping packet");
1176 return BFD_UDP_ERROR_BAD;
1178 bfd_udp_error_t err;
1179 if (BFD_UDP_ERROR_NONE != (err = bfd_udp4_verify_transport (ip4, udp, bs)))
1183 bfd_rpc_update_session (vm, bs->bs_idx, pkt);
1185 return BFD_UDP_ERROR_NONE;
1189 bfd_udp6_find_headers (vlib_buffer_t * b, ip6_header_t ** ip6,
1190 udp_header_t ** udp)
1192 /* sanity check first */
1193 const i32 start = vnet_buffer (b)->l3_hdr_offset;
1194 if (start < -(signed) sizeof (b->pre_data))
1196 BFD_ERR ("Start of ip header is before pre_data, ignoring");
1201 *ip6 = (ip6_header_t *) (b->data + start);
1202 if ((u8 *) * ip6 > (u8 *) vlib_buffer_get_current (b))
1204 BFD_ERR ("Start of ip header is beyond current data, ignoring");
1209 if ((*ip6)->protocol != IP_PROTOCOL_UDP)
1211 BFD_ERR ("Unexpected protocol in IPv6 header '%u', expected '%u' (== "
1212 "IP_PROTOCOL_UDP)", (*ip6)->protocol, IP_PROTOCOL_UDP);
1217 *udp = (udp_header_t *) ((*ip6) + 1);
1220 static bfd_udp_error_t
1221 bfd_udp6_verify_transport (const ip6_header_t * ip6,
1222 const udp_header_t * udp, const bfd_session_t * bs)
1224 const bfd_udp_session_t *bus = &bs->udp;
1225 const bfd_udp_key_t *key = &bus->key;
1226 if (ip6->src_address.as_u64[0] != key->peer_addr.ip6.as_u64[0] &&
1227 ip6->src_address.as_u64[1] != key->peer_addr.ip6.as_u64[1])
1229 BFD_ERR ("IP src addr mismatch, got %U, expected %U",
1230 format_ip6_address, ip6, format_ip6_address,
1231 &key->peer_addr.ip6);
1232 return BFD_UDP_ERROR_BAD;
1234 if (ip6->dst_address.as_u64[0] != key->local_addr.ip6.as_u64[0] &&
1235 ip6->dst_address.as_u64[1] != key->local_addr.ip6.as_u64[1])
1237 BFD_ERR ("IP dst addr mismatch, got %U, expected %U",
1238 format_ip6_address, ip6, format_ip6_address,
1239 &key->local_addr.ip6);
1240 return BFD_UDP_ERROR_BAD;
1242 const u8 expected_hop_limit = 255;
1243 if (ip6->hop_limit != expected_hop_limit)
1245 BFD_ERR ("IPv6 unexpected hop-limit value %u, expected %u",
1246 ip6->hop_limit, expected_hop_limit);
1247 return BFD_UDP_ERROR_BAD;
1249 if (clib_net_to_host_u16 (udp->src_port) < 49152)
1251 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
1254 return BFD_UDP_ERROR_NONE;
1257 static bfd_udp_error_t
1258 bfd_udp6_scan (vlib_main_t *vm, vlib_buffer_t *b, bfd_session_t **bs_out)
1260 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
1261 if (sizeof (*pkt) > b->current_length)
1264 ("Payload size %d too small to hold bfd packet of minimum size %d",
1265 b->current_length, sizeof (*pkt));
1266 return BFD_UDP_ERROR_BAD;
1270 bfd_udp6_find_headers (b, &ip6, &udp);
1273 BFD_ERR ("Couldn't find ip6 or udp header");
1274 return BFD_UDP_ERROR_BAD;
1276 const u32 udp_payload_length = udp->length - sizeof (*udp);
1277 if (pkt->head.length > udp_payload_length)
1280 ("BFD packet length is larger than udp payload length (%u > %u)",
1281 pkt->head.length, udp_payload_length);
1282 return BFD_UDP_ERROR_BAD;
1284 if (!bfd_verify_pkt_common (pkt))
1286 return BFD_UDP_ERROR_BAD;
1288 bfd_session_t *bs = NULL;
1291 BFD_DBG ("Looking up BFD session using discriminator %u",
1293 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
1298 clib_memset (&key, 0, sizeof (key));
1299 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
1300 key.local_addr.ip6.as_u64[0] = ip6->dst_address.as_u64[0];
1301 key.local_addr.ip6.as_u64[1] = ip6->dst_address.as_u64[1];
1302 key.peer_addr.ip6.as_u64[0] = ip6->src_address.as_u64[0];
1303 key.peer_addr.ip6.as_u64[1] = ip6->src_address.as_u64[1];
1304 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
1306 key.sw_if_index, format_ip6_address, &key.local_addr,
1307 format_ip6_address, &key.peer_addr);
1308 bs = bfd_lookup_session (&bfd_udp_main, &key);
1312 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
1313 return BFD_UDP_ERROR_BAD;
1315 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
1316 if (!bfd_verify_pkt_auth (vm, pkt, b->current_length, bs))
1318 BFD_ERR ("Packet verification failed, dropping packet");
1319 return BFD_UDP_ERROR_BAD;
1321 bfd_udp_error_t err;
1322 if (BFD_UDP_ERROR_NONE != (err = bfd_udp6_verify_transport (ip6, udp, bs)))
1326 bfd_rpc_update_session (vm, bs->bs_idx, pkt);
1328 return BFD_UDP_ERROR_NONE;
1332 * Process a frame of bfd packets
1333 * Expect 1 packet / frame
1336 bfd_udp_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1337 vlib_frame_t * f, int is_ipv6)
1339 u32 n_left_from, *from;
1340 bfd_input_trace_t *t0;
1341 bfd_main_t *bm = &bfd_main;
1343 from = vlib_frame_vector_args (f); /* array of buffer indices */
1344 n_left_from = f->n_vectors; /* number of buffer indices */
1346 while (n_left_from > 0)
1353 b0 = vlib_get_buffer (vm, bi0);
1355 bfd_session_t *bs = NULL;
1357 /* If this pkt is traced, snapshot the data */
1358 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1361 t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
1362 len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
1363 : sizeof (t0->data);
1365 clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), len);
1368 /* scan this bfd pkt. error0 is the counter index to bmp */
1372 error0 = bfd_udp6_scan (vm, b0, &bs);
1376 error0 = bfd_udp4_scan (vm, b0, &bs);
1378 b0->error = rt->errors[error0];
1380 next0 = BFD_UDP_INPUT_NEXT_NORMAL;
1381 if (BFD_UDP_ERROR_NONE == error0)
1383 vlib_increment_combined_counter (
1384 &bm->rx_counter, vm->thread_index, bs->bs_idx, 1,
1385 vlib_buffer_length_in_chain (vm, b0));
1387 * if everything went fine, check for poll bit, if present, re-use
1388 * the buffer and based on (now updated) session parameters, send
1389 * the final packet back
1391 const bfd_pkt_t *pkt = vlib_buffer_get_current (b0);
1392 if (bfd_pkt_get_poll (pkt))
1394 b0->current_data = 0;
1395 b0->current_length = 0;
1396 bfd_init_final_control_frame (vm, b0, bs);
1399 vlib_node_increment_counter (vm, bfd_udp6_input_node.index,
1404 vlib_node_increment_counter (vm, bfd_udp4_input_node.index,
1407 const bfd_udp_session_t *bus = &bs->udp;
1408 ip_adjacency_t *adj = adj_get (bus->adj_index);
1409 switch (adj->lookup_next_index)
1411 case IP_LOOKUP_NEXT_ARP:
1412 next0 = BFD_UDP_INPUT_NEXT_REPLY_ARP;
1414 case IP_LOOKUP_NEXT_REWRITE:
1415 next0 = BFD_UDP_INPUT_NEXT_REPLY_REWRITE;
1417 case IP_LOOKUP_NEXT_MIDCHAIN:
1418 next0 = BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN;
1427 vlib_set_next_frame_buffer (vm, rt, next0, bi0);
1433 return f->n_vectors;
1437 bfd_udp4_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
1439 return bfd_udp_input (vm, rt, f, 0);
1443 * bfd input graph node declaration
1446 VLIB_REGISTER_NODE (bfd_udp4_input_node, static) = {
1447 .function = bfd_udp4_input,
1448 .name = "bfd-udp4-input",
1449 .vector_size = sizeof (u32),
1450 .type = VLIB_NODE_TYPE_INTERNAL,
1452 .n_errors = BFD_UDP_N_ERROR,
1453 .error_strings = bfd_udp_error_strings,
1455 .format_trace = bfd_input_format_trace,
1457 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1460 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1461 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
1462 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
1463 [BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip4-midchain",
1469 bfd_udp6_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
1471 return bfd_udp_input (vm, rt, f, 1);
1475 VLIB_REGISTER_NODE (bfd_udp6_input_node, static) = {
1476 .function = bfd_udp6_input,
1477 .name = "bfd-udp6-input",
1478 .vector_size = sizeof (u32),
1479 .type = VLIB_NODE_TYPE_INTERNAL,
1481 .n_errors = BFD_UDP_N_ERROR,
1482 .error_strings = bfd_udp_error_strings,
1484 .format_trace = bfd_input_format_trace,
1486 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1489 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1490 [BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
1491 [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
1492 [BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip6-midchain",
1498 * Process a frame of bfd echo packets
1499 * Expect 1 packet / frame
1502 bfd_udp_echo_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1503 vlib_frame_t * f, int is_ipv6)
1505 u32 n_left_from, *from;
1506 bfd_input_trace_t *t0;
1507 bfd_main_t *bm = &bfd_main;
1509 from = vlib_frame_vector_args (f); /* array of buffer indices */
1510 n_left_from = f->n_vectors; /* number of buffer indices */
1512 while (n_left_from > 0)
1519 b0 = vlib_get_buffer (vm, bi0);
1521 /* If this pkt is traced, snapshot the data */
1522 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1525 t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
1526 len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
1527 : sizeof (t0->data);
1529 clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), len);
1532 bfd_session_t *bs = NULL;
1534 if ((bs = bfd_consume_echo_pkt (vm, bfd_udp_main.bfd_main, b0)))
1536 b0->error = rt->errors[BFD_UDP_ERROR_NONE];
1537 next0 = BFD_UDP_ECHO_INPUT_NEXT_NORMAL;
1541 /* loop back the packet */
1542 b0->error = rt->errors[BFD_UDP_ERROR_NONE];
1545 vlib_node_increment_counter (vm, bfd_udp_echo6_input_node.index,
1550 vlib_node_increment_counter (vm, bfd_udp_echo4_input_node.index,
1553 next0 = BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE;
1560 vlib_increment_combined_counter (
1561 &bm->rx_echo_counter, vm->thread_index, bs->bs_idx, 1,
1562 vlib_buffer_length_in_chain (vm, b0));
1565 vlib_set_next_frame_buffer (vm, rt, next0, bi0);
1571 return f->n_vectors;
1575 bfd_udp_echo4_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1578 return bfd_udp_echo_input (vm, rt, f, 0);
1582 bfd_echo_input_format_trace (u8 * s, va_list * args)
1584 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1585 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1586 const bfd_udp_echo_input_trace_t *t =
1587 va_arg (*args, bfd_udp_echo_input_trace_t *);
1588 if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head))
1590 s = format (s, "BFD ECHO:\n");
1591 s = format (s, " data: %U", format_hexdump, t->data, t->len);
1598 * bfd input graph node declaration
1601 VLIB_REGISTER_NODE (bfd_udp_echo4_input_node, static) = {
1602 .function = bfd_udp_echo4_input,
1603 .name = "bfd-udp-echo4-input",
1604 .vector_size = sizeof (u32),
1605 .type = VLIB_NODE_TYPE_INTERNAL,
1607 .n_errors = BFD_UDP_ECHO_N_ERROR,
1608 .error_strings = bfd_udp_error_strings,
1610 .format_trace = bfd_echo_input_format_trace,
1612 .n_next_nodes = BFD_UDP_ECHO_INPUT_N_NEXT,
1615 [BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop",
1616 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
1617 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
1623 bfd_udp_echo6_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
1626 return bfd_udp_echo_input (vm, rt, f, 1);
1630 VLIB_REGISTER_NODE (bfd_udp_echo6_input_node, static) = {
1631 .function = bfd_udp_echo6_input,
1632 .name = "bfd-udp-echo6-input",
1633 .vector_size = sizeof (u32),
1634 .type = VLIB_NODE_TYPE_INTERNAL,
1636 .n_errors = BFD_UDP_ECHO_N_ERROR,
1637 .error_strings = bfd_udp_echo_error_strings,
1639 .format_trace = bfd_echo_input_format_trace,
1641 .n_next_nodes = BFD_UDP_ECHO_INPUT_N_NEXT,
1644 [BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop",
1645 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
1646 [BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
1652 static clib_error_t *
1653 bfd_udp_sw_if_add_del (CLIB_UNUSED (vnet_main_t *vnm), u32 sw_if_index,
1656 u32 *to_be_freed = NULL;
1657 bfd_udp_main_t *bum = &bfd_udp_main;
1658 BFD_DBG ("sw_if_add_del called, sw_if_index=%u, is_create=%u", sw_if_index,
1663 pool_foreach (bs, bum->bfd_main->sessions)
1665 if (bs->transport != BFD_TRANSPORT_UDP4 &&
1666 bs->transport != BFD_TRANSPORT_UDP6)
1670 if (bs->udp.key.sw_if_index != sw_if_index)
1674 vec_add1 (to_be_freed, bs->bs_idx);
1678 vec_foreach (bs_idx, to_be_freed)
1680 bfd_session_t *bs = pool_elt_at_index (bum->bfd_main->sessions, *bs_idx);
1681 vlib_log_notice (bum->log_class,
1682 "removal of sw_if_index=%u forces removal of bfd "
1683 "session with bs_idx=%u",
1684 sw_if_index, bs->bs_idx);
1685 bfd_session_set_flags (vlib_get_main (), bs, 0);
1686 bfd_udp_del_session_internal (vlib_get_main (), bs);
1691 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (bfd_udp_sw_if_add_del);
1694 bfd_udp_stats_init (bfd_udp_main_t *bum)
1696 const char *name4 = "/bfd/udp4/sessions";
1697 bum->udp4_sessions_count_stat_seg_entry =
1698 stat_segment_new_entry ((u8 *) name4, STAT_DIR_TYPE_SCALAR_INDEX);
1700 stat_segment_set_state_counter (bum->udp4_sessions_count_stat_seg_entry, 0);
1701 if (~0 == bum->udp4_sessions_count_stat_seg_entry)
1703 return clib_error_return (
1704 0, "Could not create stat segment entry for %s", name4);
1706 const char *name6 = "/bfd/udp6/sessions";
1707 bum->udp6_sessions_count_stat_seg_entry =
1708 stat_segment_new_entry ((u8 *) name6, STAT_DIR_TYPE_SCALAR_INDEX);
1710 if (~0 == bum->udp6_sessions_count_stat_seg_entry)
1712 return clib_error_return (
1713 0, "Could not create stat segment entry for %s", name6);
1722 static clib_error_t *
1723 bfd_udp_init (vlib_main_t * vm)
1725 bfd_udp_main.udp4_sessions_count = 0;
1726 bfd_udp_main.udp6_sessions_count = 0;
1727 mhash_init (&bfd_udp_main.bfd_session_idx_by_bfd_key, sizeof (uword),
1728 sizeof (bfd_udp_key_t));
1729 bfd_udp_main.bfd_main = &bfd_main;
1730 bfd_udp_main.vnet_main = vnet_get_main ();
1731 vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip4-arp");
1733 bfd_udp_main.ip4_arp_idx = node->index;
1734 node = vlib_get_node_by_name (vm, (u8 *) "ip6-discover-neighbor");
1736 bfd_udp_main.ip6_ndp_idx = node->index;
1737 node = vlib_get_node_by_name (vm, (u8 *) "ip4-rewrite");
1739 bfd_udp_main.ip4_rewrite_idx = node->index;
1740 node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite");
1742 bfd_udp_main.ip6_rewrite_idx = node->index;
1743 node = vlib_get_node_by_name (vm, (u8 *) "ip4-midchain");
1745 bfd_udp_main.ip4_midchain_idx = node->index;
1746 node = vlib_get_node_by_name (vm, (u8 *) "ip6-midchain");
1748 bfd_udp_main.ip6_midchain_idx = node->index;
1750 bfd_udp_stats_init (&bfd_udp_main);
1752 bfd_udp_main.log_class = vlib_log_register_class ("bfd", "udp");
1753 vlib_log_debug (bfd_udp_main.log_class, "initialized");
1757 VLIB_INIT_FUNCTION (bfd_udp_init);
1760 * fd.io coding-style-patch-verification: ON
1763 * eval: (c-set-style "gnu")