1 #include <vppinfra/types.h>
2 #include <vlibmemory/api.h>
4 #include <vlib/buffer.h>
5 #include <vnet/ip/format.h>
6 #include <vnet/ethernet/packet.h>
7 #include <vnet/ip/udp_packet.h>
8 #include <vnet/ip/lookup.h>
9 #include <vnet/ip/icmp46_packet.h>
10 #include <vnet/ip/ip4.h>
11 #include <vnet/ip/ip6.h>
12 #include <vnet/ip/udp.h>
13 #include <vnet/ip/ip6_packet.h>
14 #include <vnet/adj/adj.h>
15 #include <vnet/adj/adj_nbr.h>
16 #include <vnet/bfd/bfd_debug.h>
17 #include <vnet/bfd/bfd_udp.h>
18 #include <vnet/bfd/bfd_main.h>
19 #include <vnet/bfd/bfd_api.h>
24 /* hashmap - bfd session index by bfd key - used for CLI/API lookup, where
25 * discriminator is unknown */
26 mhash_t bfd_session_idx_by_bfd_key;
29 static vlib_node_registration_t bfd_udp4_input_node;
30 static vlib_node_registration_t bfd_udp6_input_node;
32 bfd_udp_main_t bfd_udp_main;
35 bfd_add_udp4_transport (vlib_main_t * vm, vlib_buffer_t * b,
36 bfd_udp_session_t * bus)
38 const bfd_udp_key_t *key = &bus->key;
40 b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
41 vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
42 vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
48 ip4_udp_headers *headers = NULL;
49 vlib_buffer_advance (b, -sizeof (*headers));
50 headers = vlib_buffer_get_current (b);
51 memset (headers, 0, sizeof (*headers));
52 headers->ip4.ip_version_and_header_length = 0x45;
53 headers->ip4.ttl = 255;
54 headers->ip4.protocol = IP_PROTOCOL_UDP;
55 headers->ip4.src_address.as_u32 = key->local_addr.ip4.as_u32;
56 headers->ip4.dst_address.as_u32 = key->peer_addr.ip4.as_u32;
58 headers->udp.src_port = clib_host_to_net_u16 (50000); /* FIXME */
59 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4);
61 /* fix ip length, checksum and udp length */
62 const u16 ip_length = vlib_buffer_length_in_chain (vm, b);
64 headers->ip4.length = clib_host_to_net_u16 (ip_length);
65 headers->ip4.checksum = ip4_header_checksum (&headers->ip4);
67 const u16 udp_length = ip_length - (sizeof (headers->ip4));
68 headers->udp.length = clib_host_to_net_u16 (udp_length);
72 bfd_add_udp6_transport (vlib_main_t * vm, vlib_buffer_t * b,
73 bfd_udp_session_t * bus)
75 const bfd_udp_key_t *key = &bus->key;
77 b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
78 vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
79 vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
85 ip6_udp_headers *headers = NULL;
86 vlib_buffer_advance (b, -sizeof (*headers));
87 headers = vlib_buffer_get_current (b);
88 memset (headers, 0, sizeof (*headers));
89 headers->ip6.ip_version_traffic_class_and_flow_label =
90 clib_host_to_net_u32 (0x6 << 28);
91 headers->ip6.hop_limit = 255;
92 headers->ip6.protocol = IP_PROTOCOL_UDP;
93 clib_memcpy (&headers->ip6.src_address, &key->local_addr.ip6,
94 sizeof (headers->ip6.src_address));
95 clib_memcpy (&headers->ip6.dst_address, &key->peer_addr.ip6,
96 sizeof (headers->ip6.dst_address));
98 headers->udp.src_port = clib_host_to_net_u16 (50000); /* FIXME */
99 headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd6);
101 /* fix ip payload length and udp length */
102 const u16 udp_length =
103 vlib_buffer_length_in_chain (vm, b) - (sizeof (headers->ip6));
104 headers->udp.length = clib_host_to_net_u16 (udp_length);
105 headers->ip6.payload_length = headers->udp.length;
107 /* IPv6 UDP checksum is mandatory */
109 headers->udp.checksum =
110 ip6_tcp_udp_icmp_compute_checksum (vm, b, &headers->ip6, &bogus);
112 if (headers->udp.checksum == 0)
114 headers->udp.checksum = 0xffff;
118 static bfd_session_t *
119 bfd_lookup_session (bfd_udp_main_t * bum, const bfd_udp_key_t * key)
121 uword *p = mhash_get (&bum->bfd_session_idx_by_bfd_key, key);
124 return bfd_find_session_by_idx (bum->bfd_main, *p);
130 bfd_udp_key_init (bfd_udp_key_t * key, u32 sw_if_index,
131 const ip46_address_t * local_addr,
132 const ip46_address_t * peer_addr)
134 memset (key, 0, sizeof (*key));
135 key->sw_if_index = sw_if_index;
136 key->local_addr.as_u64[0] = local_addr->as_u64[0];
137 key->local_addr.as_u64[1] = local_addr->as_u64[1];
138 key->peer_addr.as_u64[0] = peer_addr->as_u64[0];
139 key->peer_addr.as_u64[1] = peer_addr->as_u64[1];
142 static vnet_api_error_t
143 bfd_udp_add_session_internal (bfd_udp_main_t * bum, u32 sw_if_index,
144 u32 desired_min_tx_us, u32 required_min_rx_us,
146 const ip46_address_t * local_addr,
147 const ip46_address_t * peer_addr,
148 bfd_session_t ** bs_out)
150 /* get a pool entry and if we end up not needing it, give it back */
151 bfd_transport_t t = BFD_TRANSPORT_UDP4;
152 if (!ip46_address_is_ip4 (local_addr))
154 t = BFD_TRANSPORT_UDP6;
156 bfd_session_t *bs = bfd_get_session (bum->bfd_main, t);
157 bfd_udp_session_t *bus = &bs->udp;
158 memset (bus, 0, sizeof (*bus));
159 bfd_udp_key_t *key = &bus->key;
160 bfd_udp_key_init (key, sw_if_index, local_addr, peer_addr);
161 const bfd_session_t *tmp = bfd_lookup_session (bum, key);
164 clib_warning ("duplicate bfd-udp session, existing bs_idx=%d",
166 bfd_put_session (bum->bfd_main, bs);
167 return VNET_API_ERROR_BFD_EEXIST;
169 mhash_set (&bum->bfd_session_idx_by_bfd_key, key, bs->bs_idx, NULL);
170 BFD_DBG ("session created, bs_idx=%u, sw_if_index=%d, local=%U, peer=%U",
171 bs->bs_idx, key->sw_if_index, format_ip46_address,
172 &key->local_addr, IP46_TYPE_ANY, format_ip46_address,
173 &key->peer_addr, IP46_TYPE_ANY);
174 if (BFD_TRANSPORT_UDP4 == t)
176 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, VNET_LINK_IP4,
179 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP4, VNET_LINK_IP4, %U, %d) "
180 "returns %d", format_ip46_address, &key->peer_addr,
181 IP46_TYPE_ANY, key->sw_if_index, bus->adj_index);
185 bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6,
188 BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP6, VNET_LINK_IP6, %U, %d) "
189 "returns %d", format_ip46_address, &key->peer_addr,
190 IP46_TYPE_ANY, key->sw_if_index, bus->adj_index);
192 bs->config_desired_min_tx_us = desired_min_tx_us;
193 bs->required_min_rx_us = required_min_rx_us;
194 bs->required_min_echo_rx_us = required_min_rx_us; /* FIXME */
195 bs->local_detect_mult = detect_mult;
200 static vnet_api_error_t
201 bfd_udp_validate_api_input (u32 sw_if_index,
202 const ip46_address_t * local_addr,
203 const ip46_address_t * peer_addr)
205 vnet_sw_interface_t *sw_if =
206 vnet_get_sw_interface (vnet_get_main (), sw_if_index);
207 u8 local_ip_valid = 0;
208 ip_interface_address_t *ia = NULL;
211 clib_warning ("got NULL sw_if");
212 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
214 if (ip46_address_is_ip4 (local_addr))
216 if (!ip46_address_is_ip4 (peer_addr))
218 clib_warning ("IP family mismatch");
219 return VNET_API_ERROR_INVALID_ARGUMENT;
221 ip4_main_t *im = &ip4_main;
224 foreach_ip_interface_address (
225 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
227 ip_interface_address_get_address (&im->lookup_main, ia);
228 if (x->as_u32 == local_addr->ip4.as_u32)
230 /* valid address for this interface */
239 if (ip46_address_is_ip4 (peer_addr))
241 clib_warning ("IP family mismatch");
242 return VNET_API_ERROR_INVALID_ARGUMENT;
244 ip6_main_t *im = &ip6_main;
246 foreach_ip_interface_address (
247 &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
249 ip_interface_address_get_address (&im->lookup_main, ia);
250 if (local_addr->ip6.as_u64[0] == x->as_u64[0] &&
251 local_addr->ip6.as_u64[1] == x->as_u64[1])
253 /* valid address for this interface */
263 clib_warning ("address not found on interface");
264 return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
270 static vnet_api_error_t
271 bfd_udp_find_session_by_api_input (u32 sw_if_index,
272 const ip46_address_t * local_addr,
273 const ip46_address_t * peer_addr,
274 bfd_session_t ** bs_out)
276 vnet_api_error_t rv =
277 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
280 bfd_udp_main_t *bum = &bfd_udp_main;
282 bfd_udp_key_init (&key, sw_if_index, local_addr, peer_addr);
283 bfd_session_t *bs = bfd_lookup_session (bum, &key);
291 ("BFD session not found (sw_if_index=%u, local=%U, peer=%U",
292 sw_if_index, format_ip46_address, local_addr, IP46_TYPE_ANY,
293 format_ip46_address, peer_addr, IP46_TYPE_ANY);
294 return VNET_API_ERROR_BFD_ENOENT;
300 static vnet_api_error_t
301 bfd_api_verify_common (u32 sw_if_index, u32 desired_min_tx_us,
302 u32 required_min_rx_us, u8 detect_mult,
303 const ip46_address_t * local_addr,
304 const ip46_address_t * peer_addr)
306 vnet_api_error_t rv =
307 bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
314 clib_warning ("detect_mult < 1");
315 return VNET_API_ERROR_INVALID_ARGUMENT;
317 if (desired_min_tx_us < 1)
319 clib_warning ("desired_min_tx_us < 1");
320 return VNET_API_ERROR_INVALID_ARGUMENT;
326 bfd_udp_del_session_internal (bfd_session_t * bs)
328 bfd_udp_main_t *bum = &bfd_udp_main;
329 BFD_DBG ("free bfd-udp session, bs_idx=%d", bs->bs_idx);
330 mhash_unset (&bum->bfd_session_idx_by_bfd_key, &bs->udp.key, NULL);
331 adj_unlock (bs->udp.adj_index);
332 bfd_put_session (bum->bfd_main, bs);
336 bfd_udp_add_session (u32 sw_if_index, const ip46_address_t * local_addr,
337 const ip46_address_t * peer_addr, u32 desired_min_tx_us,
338 u32 required_min_rx_us, u8 detect_mult,
339 u8 is_authenticated, u32 conf_key_id, u8 bfd_key_id)
341 vnet_api_error_t rv = bfd_api_verify_common (sw_if_index, desired_min_tx_us,
344 local_addr, peer_addr);
345 bfd_session_t *bs = NULL;
349 bfd_udp_add_session_internal (&bfd_udp_main, sw_if_index,
350 desired_min_tx_us, required_min_rx_us,
351 detect_mult, local_addr, peer_addr,
354 if (!rv && is_authenticated)
357 rv = bfd_auth_activate (bs, conf_key_id, bfd_key_id,
358 0 /* is not delayed */ );
360 clib_warning ("SSL missing, cannot add authenticated BFD session");
361 rv = VNET_API_ERROR_BFD_NOTSUPP;
365 bfd_udp_del_session_internal (bs);
370 bfd_session_start (bfd_udp_main.bfd_main, bs);
377 bfd_udp_del_session (u32 sw_if_index,
378 const ip46_address_t * local_addr,
379 const ip46_address_t * peer_addr)
381 bfd_session_t *bs = NULL;
382 vnet_api_error_t rv =
383 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
389 bfd_udp_del_session_internal (bs);
394 bfd_udp_session_set_flags (u32 sw_if_index,
395 const ip46_address_t * local_addr,
396 const ip46_address_t * peer_addr, u8 admin_up_down)
398 bfd_session_t *bs = NULL;
399 vnet_api_error_t rv =
400 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
406 bfd_session_set_flags (bs, admin_up_down);
411 bfd_auth_set_key (u32 conf_key_id, u8 auth_type, u8 key_len,
415 bfd_auth_key_t *auth_key = NULL;
416 if (!key_len || key_len > bfd_max_len_for_auth_type (auth_type))
418 clib_warning ("Invalid authentication key length for auth_type=%d:%s "
419 "(key_len=%u, must be "
420 "non-zero, expected max=%u)",
421 auth_type, bfd_auth_type_str (auth_type), key_len,
422 (u32) bfd_max_len_for_auth_type (auth_type));
423 return VNET_API_ERROR_INVALID_VALUE;
425 if (!bfd_auth_type_supported (auth_type))
427 clib_warning ("Unsupported auth type=%d:%s", auth_type,
428 bfd_auth_type_str (auth_type));
429 return VNET_API_ERROR_BFD_NOTSUPP;
431 bfd_main_t *bm = bfd_udp_main.bfd_main;
432 uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
435 /* modifying existing key - must not be used */
436 const uword key_idx = *key_idx_p;
437 auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
438 if (auth_key->use_count > 0)
440 clib_warning ("Authentication key with conf ID %u in use by %u BFD "
441 "sessions - cannot modify",
442 conf_key_id, auth_key->use_count);
443 return VNET_API_ERROR_BFD_EINUSE;
449 pool_get (bm->auth_keys, auth_key);
450 auth_key->conf_key_id = conf_key_id;
451 hash_set (bm->auth_key_by_conf_key_id, conf_key_id,
452 auth_key - bm->auth_keys);
454 auth_key->auth_type = auth_type;
455 memset (auth_key->key, 0, sizeof (auth_key->key));
456 clib_memcpy (auth_key->key, key_data, key_len);
459 clib_warning ("SSL missing, cannot manipulate authentication keys");
460 return VNET_API_ERROR_BFD_NOTSUPP;
465 bfd_auth_del_key (u32 conf_key_id)
468 bfd_auth_key_t *auth_key = NULL;
469 bfd_main_t *bm = bfd_udp_main.bfd_main;
470 uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
473 /* deleting existing key - must not be used */
474 const uword key_idx = *key_idx_p;
475 auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
476 if (auth_key->use_count > 0)
478 clib_warning ("Authentication key with conf ID %u in use by %u BFD "
479 "sessions - cannot delete",
480 conf_key_id, auth_key->use_count);
481 return VNET_API_ERROR_BFD_EINUSE;
483 hash_unset (bm->auth_key_by_conf_key_id, conf_key_id);
484 memset (auth_key, 0, sizeof (*auth_key));
485 pool_put (bm->auth_keys, auth_key);
490 clib_warning ("Authentication key with conf ID %u does not exist",
492 return VNET_API_ERROR_BFD_ENOENT;
496 clib_warning ("SSL missing, cannot manipulate authentication keys");
497 return VNET_API_ERROR_BFD_NOTSUPP;
502 bfd_udp_auth_activate (u32 sw_if_index,
503 const ip46_address_t * local_addr,
504 const ip46_address_t * peer_addr,
505 u32 conf_key_id, u8 key_id, u8 is_delayed)
508 bfd_session_t *bs = NULL;
509 vnet_api_error_t rv =
510 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
516 return bfd_auth_activate (bs, conf_key_id, key_id, is_delayed);
518 clib_warning ("SSL missing, cannot activate BFD authentication");
519 return VNET_API_ERROR_BFD_NOTSUPP;
524 bfd_udp_auth_deactivate (u32 sw_if_index,
525 const ip46_address_t * local_addr,
526 const ip46_address_t * peer_addr, u8 is_delayed)
528 bfd_session_t *bs = NULL;
529 vnet_api_error_t rv =
530 bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
536 return bfd_auth_deactivate (bs, is_delayed);
541 BFD_UDP_INPUT_NEXT_NORMAL,
542 BFD_UDP_INPUT_NEXT_REPLY,
543 BFD_UDP_INPUT_N_NEXT,
544 } bfd_udp_input_next_t;
546 /* Packet counters */
547 #define foreach_bfd_udp_error(F) \
548 F (NONE, "good bfd packets (processed)") \
549 F (BAD, "invalid bfd packets") \
550 F (DISABLED, "bfd packets received on disabled interfaces")
552 #define F(sym, string) static char BFD_UDP_ERR_##sym##_STR[] = string;
553 foreach_bfd_udp_error (F);
556 static char *bfd_udp_error_strings[] = {
557 #define F(sym, string) BFD_UDP_ERR_##sym##_STR,
558 foreach_bfd_udp_error (F)
564 #define F(sym, str) BFD_UDP_ERROR_##sym,
565 foreach_bfd_udp_error (F)
571 bfd_udp4_find_headers (vlib_buffer_t * b, const ip4_header_t ** ip4,
572 const udp_header_t ** udp)
574 /* sanity check first */
575 const i32 start = vnet_buffer (b)->ip.start_of_ip_header;
576 if (start < 0 && start < sizeof (b->pre_data))
578 BFD_ERR ("Start of ip header is before pre_data, ignoring");
583 *ip4 = (ip4_header_t *) (b->data + start);
584 if ((u8 *) * ip4 > (u8 *) vlib_buffer_get_current (b))
586 BFD_ERR ("Start of ip header is beyond current data, ignoring");
591 *udp = (udp_header_t *) ((*ip4) + 1);
594 static bfd_udp_error_t
595 bfd_udp4_verify_transport (const ip4_header_t * ip4,
596 const udp_header_t * udp, const bfd_session_t * bs)
598 const bfd_udp_session_t *bus = &bs->udp;
599 const bfd_udp_key_t *key = &bus->key;
600 if (ip4->src_address.as_u32 != key->peer_addr.ip4.as_u32)
602 BFD_ERR ("IPv4 src addr mismatch, got %U, expected %U",
603 format_ip4_address, ip4->src_address.as_u8, format_ip4_address,
604 key->peer_addr.ip4.as_u8);
605 return BFD_UDP_ERROR_BAD;
607 if (ip4->dst_address.as_u32 != key->local_addr.ip4.as_u32)
609 BFD_ERR ("IPv4 dst addr mismatch, got %U, expected %U",
610 format_ip4_address, ip4->dst_address.as_u8, format_ip4_address,
611 key->local_addr.ip4.as_u8);
612 return BFD_UDP_ERROR_BAD;
614 const u8 expected_ttl = 255;
615 if (ip4->ttl != expected_ttl)
617 BFD_ERR ("IPv4 unexpected TTL value %u, expected %u", ip4->ttl,
619 return BFD_UDP_ERROR_BAD;
621 if (clib_net_to_host_u16 (udp->src_port) < 49152 ||
622 clib_net_to_host_u16 (udp->src_port) > 65535)
624 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
627 return BFD_UDP_ERROR_NONE;
637 bfd_rpc_update_session_cb (const bfd_rpc_update_t * a)
639 bfd_consume_pkt (bfd_udp_main.bfd_main, &a->pkt, a->bs_idx);
643 bfd_rpc_update_session (u32 bs_idx, const bfd_pkt_t * pkt)
645 /* packet length was already verified to be correct by the caller */
646 const u32 data_size = sizeof (bfd_rpc_update_t) -
647 STRUCT_SIZE_OF (bfd_rpc_update_t, pkt) + pkt->head.length;
649 bfd_rpc_update_t *update = (bfd_rpc_update_t *) data;
650 update->bs_idx = bs_idx;
651 clib_memcpy (&update->pkt, pkt, pkt->head.length);
652 vl_api_rpc_call_main_thread (bfd_rpc_update_session_cb, data, data_size);
655 static bfd_udp_error_t
656 bfd_udp4_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
657 vlib_buffer_t * b, bfd_session_t ** bs_out)
659 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
660 if (sizeof (*pkt) > b->current_length)
663 ("Payload size %d too small to hold bfd packet of minimum size %d",
664 b->current_length, sizeof (*pkt));
665 return BFD_UDP_ERROR_BAD;
667 const ip4_header_t *ip4;
668 const udp_header_t *udp;
669 bfd_udp4_find_headers (b, &ip4, &udp);
672 BFD_ERR ("Couldn't find ip4 or udp header");
673 return BFD_UDP_ERROR_BAD;
675 const u32 udp_payload_length = udp->length - sizeof (*udp);
676 if (pkt->head.length > udp_payload_length)
679 ("BFD packet length is larger than udp payload length (%u > %u)",
680 pkt->head.length, udp_payload_length);
681 return BFD_UDP_ERROR_BAD;
683 if (!bfd_verify_pkt_common (pkt))
685 return BFD_UDP_ERROR_BAD;
687 bfd_session_t *bs = NULL;
690 BFD_DBG ("Looking up BFD session using discriminator %u",
692 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
697 memset (&key, 0, sizeof (key));
698 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
699 key.local_addr.ip4.as_u32 = ip4->dst_address.as_u32;
700 key.peer_addr.ip4.as_u32 = ip4->src_address.as_u32;
701 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
703 key.sw_if_index, format_ip4_address, key.local_addr.ip4.as_u8,
704 format_ip4_address, key.peer_addr.ip4.as_u8);
705 bs = bfd_lookup_session (&bfd_udp_main, &key);
709 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
710 return BFD_UDP_ERROR_BAD;
712 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
713 if (!bfd_verify_pkt_auth (pkt, b->current_length, bs))
715 BFD_ERR ("Packet verification failed, dropping packet");
716 return BFD_UDP_ERROR_BAD;
719 if (BFD_UDP_ERROR_NONE != (err = bfd_udp4_verify_transport (ip4, udp, bs)))
723 bfd_rpc_update_session (bs->bs_idx, pkt);
725 return BFD_UDP_ERROR_NONE;
729 bfd_udp6_find_headers (vlib_buffer_t * b, const ip6_header_t ** ip6,
730 const udp_header_t ** udp)
732 /* sanity check first */
733 const i32 start = vnet_buffer (b)->ip.start_of_ip_header;
734 if (start < 0 && start < sizeof (b->pre_data))
736 BFD_ERR ("Start of ip header is before pre_data, ignoring");
741 *ip6 = (ip6_header_t *) (b->data + start);
742 if ((u8 *) * ip6 > (u8 *) vlib_buffer_get_current (b))
744 BFD_ERR ("Start of ip header is beyond current data, ignoring");
749 if ((*ip6)->protocol != IP_PROTOCOL_UDP)
751 BFD_ERR ("Unexpected protocol in IPv6 header '%u', expected '%u' (== "
752 "IP_PROTOCOL_UDP)", (*ip6)->protocol, IP_PROTOCOL_UDP);
757 *udp = (udp_header_t *) ((*ip6) + 1);
760 static bfd_udp_error_t
761 bfd_udp6_verify_transport (const ip6_header_t * ip6,
762 const udp_header_t * udp, const bfd_session_t * bs)
764 const bfd_udp_session_t *bus = &bs->udp;
765 const bfd_udp_key_t *key = &bus->key;
766 if (ip6->src_address.as_u64[0] != key->peer_addr.ip6.as_u64[0] &&
767 ip6->src_address.as_u64[1] != key->peer_addr.ip6.as_u64[1])
769 BFD_ERR ("IP src addr mismatch, got %U, expected %U",
770 format_ip6_address, ip6, format_ip6_address,
771 &key->peer_addr.ip6);
772 return BFD_UDP_ERROR_BAD;
774 if (ip6->dst_address.as_u64[0] != key->local_addr.ip6.as_u64[0] &&
775 ip6->dst_address.as_u64[1] != key->local_addr.ip6.as_u64[1])
777 BFD_ERR ("IP dst addr mismatch, got %U, expected %U",
778 format_ip6_address, ip6, format_ip6_address,
779 &key->local_addr.ip6);
780 return BFD_UDP_ERROR_BAD;
782 const u8 expected_hop_limit = 255;
783 if (ip6->hop_limit != expected_hop_limit)
785 BFD_ERR ("IPv6 unexpected hop-limit value %u, expected %u",
786 ip6->hop_limit, expected_hop_limit);
787 return BFD_UDP_ERROR_BAD;
789 if (clib_net_to_host_u16 (udp->src_port) < 49152 ||
790 clib_net_to_host_u16 (udp->src_port) > 65535)
792 BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
795 return BFD_UDP_ERROR_NONE;
798 static bfd_udp_error_t
799 bfd_udp6_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
800 vlib_buffer_t * b, bfd_session_t ** bs_out)
802 const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
803 if (sizeof (*pkt) > b->current_length)
806 ("Payload size %d too small to hold bfd packet of minimum size %d",
807 b->current_length, sizeof (*pkt));
808 return BFD_UDP_ERROR_BAD;
810 const ip6_header_t *ip6;
811 const udp_header_t *udp;
812 bfd_udp6_find_headers (b, &ip6, &udp);
815 BFD_ERR ("Couldn't find ip6 or udp header");
816 return BFD_UDP_ERROR_BAD;
818 const u32 udp_payload_length = udp->length - sizeof (*udp);
819 if (pkt->head.length > udp_payload_length)
822 ("BFD packet length is larger than udp payload length (%u > %u)",
823 pkt->head.length, udp_payload_length);
824 return BFD_UDP_ERROR_BAD;
826 if (!bfd_verify_pkt_common (pkt))
828 return BFD_UDP_ERROR_BAD;
830 bfd_session_t *bs = NULL;
833 BFD_DBG ("Looking up BFD session using discriminator %u",
835 bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
840 memset (&key, 0, sizeof (key));
841 key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
842 key.local_addr.ip6.as_u64[0] = ip6->dst_address.as_u64[0];
843 key.local_addr.ip6.as_u64[1] = ip6->dst_address.as_u64[1];
844 key.peer_addr.ip6.as_u64[0] = ip6->src_address.as_u64[0];
845 key.peer_addr.ip6.as_u64[1] = ip6->src_address.as_u64[1];
846 BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
848 key.sw_if_index, format_ip6_address, &key.local_addr,
849 format_ip6_address, &key.peer_addr);
850 bs = bfd_lookup_session (&bfd_udp_main, &key);
854 BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
855 return BFD_UDP_ERROR_BAD;
857 BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
858 if (!bfd_verify_pkt_auth (pkt, b->current_length, bs))
860 BFD_ERR ("Packet verification failed, dropping packet");
861 return BFD_UDP_ERROR_BAD;
864 if (BFD_UDP_ERROR_NONE != (err = bfd_udp6_verify_transport (ip6, udp, bs)))
868 bfd_rpc_update_session (bs->bs_idx, pkt);
870 return BFD_UDP_ERROR_NONE;
874 * Process a frame of bfd packets
875 * Expect 1 packet / frame
878 bfd_udp_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
879 vlib_frame_t * f, int is_ipv6)
881 u32 n_left_from, *from;
882 bfd_input_trace_t *t0;
884 from = vlib_frame_vector_args (f); /* array of buffer indices */
885 n_left_from = f->n_vectors; /* number of buffer indices */
887 while (n_left_from > 0)
894 b0 = vlib_get_buffer (vm, bi0);
896 bfd_session_t *bs = NULL;
898 /* If this pkt is traced, snapshot the data */
899 if (b0->flags & VLIB_BUFFER_IS_TRACED)
902 t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
903 len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
906 clib_memcpy (t0->data, vlib_buffer_get_current (b0), len);
909 /* scan this bfd pkt. error0 is the counter index to bmp */
912 error0 = bfd_udp6_scan (vm, rt, b0, &bs);
916 error0 = bfd_udp4_scan (vm, rt, b0, &bs);
918 b0->error = rt->errors[error0];
920 next0 = BFD_UDP_INPUT_NEXT_NORMAL;
921 if (BFD_UDP_ERROR_NONE == error0)
924 * if everything went fine, check for poll bit, if present, re-use
925 * the buffer and based on (now updated) session parameters, send
926 * the final packet back
928 const bfd_pkt_t *pkt = vlib_buffer_get_current (b0);
929 if (bfd_pkt_get_poll (pkt))
931 bfd_init_final_control_frame (vm, b0, bs);
934 vlib_node_increment_counter (vm, bfd_udp6_input_node.index,
939 vlib_node_increment_counter (vm, bfd_udp4_input_node.index,
942 next0 = BFD_UDP_INPUT_NEXT_REPLY;
945 vlib_set_next_frame_buffer (vm, rt, next0, bi0);
955 bfd_udp4_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
957 return bfd_udp_input (vm, rt, f, 0);
961 * bfd input graph node declaration
964 VLIB_REGISTER_NODE (bfd_udp4_input_node, static) = {
965 .function = bfd_udp4_input,
966 .name = "bfd-udp4-input",
967 .vector_size = sizeof (u32),
968 .type = VLIB_NODE_TYPE_INTERNAL,
970 .n_errors = BFD_UDP_N_ERROR,
971 .error_strings = bfd_udp_error_strings,
973 .format_trace = bfd_input_format_trace,
975 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
978 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
979 [BFD_UDP_INPUT_NEXT_REPLY] = "ip4-lookup",
985 bfd_udp6_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
987 return bfd_udp_input (vm, rt, f, 1);
991 VLIB_REGISTER_NODE (bfd_udp6_input_node, static) = {
992 .function = bfd_udp6_input,
993 .name = "bfd-udp6-input",
994 .vector_size = sizeof (u32),
995 .type = VLIB_NODE_TYPE_INTERNAL,
997 .n_errors = BFD_UDP_N_ERROR,
998 .error_strings = bfd_udp_error_strings,
1000 .format_trace = bfd_input_format_trace,
1002 .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
1005 [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
1006 [BFD_UDP_INPUT_NEXT_REPLY] = "ip6-lookup",
1011 static clib_error_t *
1012 bfd_sw_interface_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
1014 // vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1015 if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1022 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (bfd_sw_interface_up_down);
1024 static clib_error_t *
1025 bfd_hw_interface_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1027 if (flags & VNET_HW_INTERFACE_FLAG_LINK_UP)
1034 VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bfd_hw_interface_up_down);
1039 static clib_error_t *
1040 bfd_udp_init (vlib_main_t * vm)
1042 mhash_init (&bfd_udp_main.bfd_session_idx_by_bfd_key, sizeof (uword),
1043 sizeof (bfd_udp_key_t));
1044 bfd_udp_main.bfd_main = &bfd_main;
1045 udp_register_dst_port (vm, UDP_DST_PORT_bfd4, bfd_udp4_input_node.index, 1);
1046 udp_register_dst_port (vm, UDP_DST_PORT_bfd6, bfd_udp6_input_node.index, 0);
1050 VLIB_INIT_FUNCTION (bfd_udp_init);
1053 * fd.io coding-style-patch-verification: ON
1056 * eval: (c-set-style "gnu")