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c43ed2e4 DS |
1 | /** |
2 | * bgp_bfd.c: BGP BFD handling routines | |
3 | * | |
4 | * @copyright Copyright (C) 2015 Cumulus Networks, Inc. | |
5 | * | |
6 | * This file is part of GNU Zebra. | |
7 | * | |
8 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2, or (at your option) any | |
11 | * later version. | |
12 | * | |
13 | * GNU Zebra is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
20 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
21 | * 02111-1307, USA. | |
22 | */ | |
23 | ||
24 | #include <zebra.h> | |
25 | ||
26 | #include "command.h" | |
27 | #include "linklist.h" | |
28 | #include "memory.h" | |
29 | #include "prefix.h" | |
30 | #include "thread.h" | |
31 | #include "buffer.h" | |
32 | #include "stream.h" | |
33 | #include "zclient.h" | |
34 | #include "vty.h" | |
7f342629 | 35 | #include "bfd.h" |
856ca177 | 36 | #include "lib/json.h" |
c43ed2e4 | 37 | #include "bgpd/bgpd.h" |
7f342629 | 38 | #include "bgp_fsm.h" |
c43ed2e4 DS |
39 | #include "bgpd/bgp_bfd.h" |
40 | #include "bgpd/bgp_debug.h" | |
41 | #include "bgpd/bgp_vty.h" | |
42 | ||
43 | extern struct zclient *zclient; | |
44 | ||
c43ed2e4 DS |
45 | /* |
46 | * bgp_bfd_peer_group2peer_copy - Copy the BFD information from peer group template | |
47 | * to peer. | |
48 | */ | |
49 | void | |
50 | bgp_bfd_peer_group2peer_copy(struct peer *conf, struct peer *peer) | |
51 | { | |
7f342629 DS |
52 | struct bfd_info *bfd_info; |
53 | struct bfd_info *conf_bfd_info; | |
54 | ||
55 | if (!conf->bfd_info) | |
56 | return; | |
57 | ||
58 | conf_bfd_info = (struct bfd_info *)conf->bfd_info; | |
59 | if (!peer->bfd_info) | |
60 | peer->bfd_info = bfd_info_create(); | |
c43ed2e4 | 61 | |
7f342629 | 62 | bfd_info = (struct bfd_info *)peer->bfd_info; |
c43ed2e4 DS |
63 | |
64 | /* Copy BFD parameter values */ | |
65 | bfd_info->required_min_rx = conf_bfd_info->required_min_rx; | |
66 | bfd_info->desired_min_tx = conf_bfd_info->desired_min_tx; | |
67 | bfd_info->detect_mult = conf_bfd_info->detect_mult; | |
68 | } | |
69 | ||
70 | /* | |
71 | * bgp_bfd_is_peer_multihop - returns whether BFD peer is multi-hop or single hop. | |
72 | */ | |
73 | static int | |
74 | bgp_bfd_is_peer_multihop(struct peer *peer) | |
75 | { | |
68fe91d6 | 76 | if((peer->conf_if == NULL) && ((peer->sort == BGP_PEER_IBGP) || |
77 | is_ebgp_multihop_configured(peer))) | |
c43ed2e4 DS |
78 | return 1; |
79 | else | |
80 | return 0; | |
81 | } | |
82 | ||
83 | /* | |
7f342629 DS |
84 | * bgp_bfd_peer_sendmsg - Format and send a Peer register/Unregister |
85 | * command to Zebra to be forwarded to BFD | |
c43ed2e4 DS |
86 | */ |
87 | static void | |
7f342629 | 88 | bgp_bfd_peer_sendmsg (struct peer *peer, int command) |
c43ed2e4 | 89 | { |
7f342629 DS |
90 | struct bfd_info *bfd_info; |
91 | ||
92 | bfd_info = (struct bfd_info *)peer->bfd_info; | |
93 | ||
94 | if (peer->su.sa.sa_family == AF_INET) | |
95 | bfd_peer_sendmsg (zclient, bfd_info, AF_INET, | |
96 | &peer->su.sin.sin_addr, | |
97 | (peer->su_local) ? &peer->su_local->sin.sin_addr : NULL, | |
98 | (peer->nexthop.ifp) ? peer->nexthop.ifp->name : NULL, | |
99 | peer->ttl, bgp_bfd_is_peer_multihop(peer), command, 1); | |
100 | else if (peer->su.sa.sa_family == AF_INET6) | |
101 | bfd_peer_sendmsg (zclient, bfd_info, AF_INET6, | |
102 | &peer->su.sin6.sin6_addr, | |
103 | (peer->su_local) ? &peer->su_local->sin6.sin6_addr : NULL, | |
104 | (peer->nexthop.ifp) ? peer->nexthop.ifp->name : NULL, | |
105 | peer->ttl, bgp_bfd_is_peer_multihop(peer), command, 1); | |
c43ed2e4 DS |
106 | } |
107 | ||
108 | /* | |
109 | * bgp_bfd_register_peer - register a peer with BFD through zebra | |
110 | * for monitoring the peer rechahability. | |
111 | */ | |
112 | void | |
113 | bgp_bfd_register_peer (struct peer *peer) | |
114 | { | |
7f342629 | 115 | struct bfd_info *bfd_info; |
c43ed2e4 | 116 | |
7f342629 DS |
117 | if (!peer->bfd_info) |
118 | return; | |
119 | bfd_info = (struct bfd_info *)peer->bfd_info; | |
c43ed2e4 DS |
120 | |
121 | /* Check if BFD is enabled and peer has already been registered with BFD */ | |
7f342629 | 122 | if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_REG)) |
c43ed2e4 DS |
123 | return; |
124 | ||
7f342629 | 125 | bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_REGISTER); |
c43ed2e4 DS |
126 | } |
127 | ||
128 | /** | |
129 | * bgp_bfd_deregister_peer - deregister a peer with BFD through zebra | |
130 | * for stopping the monitoring of the peer | |
131 | * rechahability. | |
132 | */ | |
133 | void | |
134 | bgp_bfd_deregister_peer (struct peer *peer) | |
135 | { | |
7f342629 | 136 | struct bfd_info *bfd_info; |
c43ed2e4 | 137 | |
7f342629 DS |
138 | if (!peer->bfd_info) |
139 | return; | |
140 | bfd_info = (struct bfd_info *)peer->bfd_info; | |
c43ed2e4 DS |
141 | |
142 | /* Check if BFD is eanbled and peer has not been registered */ | |
7f342629 | 143 | if (!CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_REG)) |
c43ed2e4 DS |
144 | return; |
145 | ||
7f342629 | 146 | bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_DEREGISTER); |
c43ed2e4 DS |
147 | } |
148 | ||
149 | /* | |
150 | * bgp_bfd_update_peer - update peer with BFD with new BFD paramters | |
151 | * through zebra. | |
152 | */ | |
7f342629 | 153 | static void |
c43ed2e4 DS |
154 | bgp_bfd_update_peer (struct peer *peer) |
155 | { | |
7f342629 | 156 | struct bfd_info *bfd_info; |
c43ed2e4 | 157 | |
7f342629 DS |
158 | if (!peer->bfd_info) |
159 | return; | |
160 | bfd_info = (struct bfd_info *)peer->bfd_info; | |
c43ed2e4 DS |
161 | |
162 | /* Check if the peer has been registered with BFD*/ | |
7f342629 | 163 | if (!CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_REG)) |
c43ed2e4 DS |
164 | return; |
165 | ||
7f342629 | 166 | bgp_bfd_peer_sendmsg(peer, ZEBRA_BFD_DEST_UPDATE); |
c43ed2e4 DS |
167 | } |
168 | ||
169 | /* | |
170 | * bgp_bfd_dest_replay - Replay all the peers that have BFD enabled | |
171 | * to zebra | |
172 | */ | |
7f342629 | 173 | static int |
c43ed2e4 DS |
174 | bgp_bfd_dest_replay (int command, struct zclient *client, zebra_size_t length) |
175 | { | |
176 | struct listnode *mnode, *node, *nnode; | |
177 | struct bgp *bgp; | |
178 | struct peer *peer; | |
179 | ||
180 | if (BGP_DEBUG (zebra, ZEBRA)) | |
181 | zlog_debug("Zebra: BFD Dest replay request"); | |
182 | ||
183 | /* Replay the peer, if BFD is enabled in BGP */ | |
184 | ||
185 | for (ALL_LIST_ELEMENTS_RO (bm->bgp, mnode, bgp)) | |
186 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
187 | { | |
c43ed2e4 DS |
188 | bgp_bfd_update_peer(peer); |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | /* | |
68fe91d6 | 195 | * bgp_bfd_peer_status_update - Update the BFD status if it has changed. Bring |
196 | * down the peer if the BFD session went down from * up. | |
197 | */ | |
198 | static void | |
199 | bgp_bfd_peer_status_update (struct peer *peer, int status) | |
200 | { | |
201 | struct bfd_info *bfd_info; | |
202 | int old_status; | |
203 | ||
204 | bfd_info = (struct bfd_info *)peer->bfd_info; | |
205 | ||
206 | if (bfd_info->status == status) | |
207 | return; | |
208 | ||
209 | old_status = bfd_info->status; | |
210 | bfd_info->status = status; | |
211 | bfd_info->last_update = bgp_clock(); | |
212 | ||
213 | if ((status == BFD_STATUS_DOWN) && (old_status == BFD_STATUS_UP)) | |
214 | { | |
215 | peer->last_reset = PEER_DOWN_BFD_DOWN; | |
216 | BGP_EVENT_ADD (peer, BGP_Stop); | |
217 | } | |
218 | } | |
219 | ||
220 | /* | |
221 | * bgp_bfd_dest_update - Find the peer for which the BFD status | |
222 | * has changed and bring down the peer | |
223 | * connectivity if the BFD session went down. | |
c43ed2e4 | 224 | */ |
7f342629 | 225 | static int |
68fe91d6 | 226 | bgp_bfd_dest_update (int command, struct zclient *zclient, |
c43ed2e4 DS |
227 | zebra_size_t length) |
228 | { | |
229 | struct interface *ifp; | |
230 | struct prefix dp; | |
231 | struct prefix sp; | |
68fe91d6 | 232 | int status; |
c43ed2e4 | 233 | |
68fe91d6 | 234 | ifp = bfd_get_peer_info (zclient->ibuf, &dp, &sp, &status); |
c43ed2e4 DS |
235 | |
236 | if (BGP_DEBUG (zebra, ZEBRA)) | |
237 | { | |
238 | char buf[2][128]; | |
239 | prefix2str(&dp, buf[0], sizeof(buf[0])); | |
240 | if (ifp) | |
241 | { | |
68fe91d6 | 242 | zlog_debug("Zebra: interface %s bfd destination %s %s", |
243 | ifp->name, buf[0], bfd_get_status_str(status)); | |
c43ed2e4 DS |
244 | } |
245 | else | |
246 | { | |
247 | prefix2str(&sp, buf[1], sizeof(buf[1])); | |
68fe91d6 | 248 | zlog_debug("Zebra: source %s bfd destination %s %s", |
249 | buf[1], buf[0], bfd_get_status_str(status)); | |
c43ed2e4 DS |
250 | } |
251 | } | |
252 | ||
253 | /* Bring the peer down if BFD is enabled in BGP */ | |
254 | { | |
255 | struct listnode *mnode, *node, *nnode; | |
256 | struct bgp *bgp; | |
257 | struct peer *peer; | |
258 | ||
259 | for (ALL_LIST_ELEMENTS_RO (bm->bgp, mnode, bgp)) | |
260 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
261 | { | |
7f342629 | 262 | if (!peer->bfd_info) |
c43ed2e4 DS |
263 | continue; |
264 | ||
7bbc6864 DS |
265 | if ((dp.family == AF_INET) && (peer->su.sa.sa_family == AF_INET)) |
266 | { | |
267 | if (dp.u.prefix4.s_addr != peer->su.sin.sin_addr.s_addr) | |
268 | continue; | |
269 | } | |
c43ed2e4 | 270 | #ifdef HAVE_IPV6 |
7bbc6864 DS |
271 | else if ((dp.family == AF_INET6) && |
272 | (peer->su.sa.sa_family == AF_INET6)) | |
273 | { | |
274 | if (memcmp(&dp.u.prefix6, &peer->su.sin6.sin6_addr, | |
275 | sizeof (struct in6_addr))) | |
276 | continue; | |
277 | } | |
c43ed2e4 DS |
278 | #endif |
279 | else | |
280 | continue; | |
281 | ||
282 | if (ifp && (ifp == peer->nexthop.ifp)) | |
7bbc6864 | 283 | { |
68fe91d6 | 284 | bgp_bfd_peer_status_update(peer, status); |
7bbc6864 | 285 | } |
c43ed2e4 DS |
286 | else |
287 | { | |
288 | if (!peer->su_local) | |
289 | continue; | |
290 | ||
7bbc6864 DS |
291 | if ((sp.family == AF_INET) && |
292 | (peer->su_local->sa.sa_family == AF_INET)) | |
293 | { | |
294 | if (sp.u.prefix4.s_addr != peer->su_local->sin.sin_addr.s_addr) | |
295 | continue; | |
296 | } | |
c43ed2e4 | 297 | #ifdef HAVE_IPV6 |
7bbc6864 DS |
298 | else if ((sp.family == AF_INET6) && |
299 | (peer->su_local->sa.sa_family == AF_INET6)) | |
300 | { | |
301 | if (memcmp(&sp.u.prefix6, &peer->su_local->sin6.sin6_addr, | |
302 | sizeof (struct in6_addr))) | |
303 | continue; | |
304 | } | |
c43ed2e4 DS |
305 | #endif |
306 | else | |
307 | continue; | |
7bbc6864 | 308 | |
68fe91d6 | 309 | bgp_bfd_peer_status_update(peer, status); |
c43ed2e4 DS |
310 | } |
311 | } | |
312 | } | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | /* | |
318 | * bgp_bfd_peer_param_set - Set the configured BFD paramter values for peer. | |
319 | */ | |
7f342629 | 320 | static int |
c43ed2e4 | 321 | bgp_bfd_peer_param_set (struct peer *peer, u_int32_t min_rx, u_int32_t min_tx, |
7f342629 | 322 | u_int8_t detect_mult, int defaults) |
c43ed2e4 DS |
323 | { |
324 | struct peer_group *group; | |
325 | struct listnode *node, *nnode; | |
7f342629 | 326 | int command = 0; |
c43ed2e4 | 327 | |
68fe91d6 | 328 | bfd_set_param((struct bfd_info **)&(peer->bfd_info), min_rx, min_tx, |
329 | detect_mult, defaults, &command); | |
c43ed2e4 DS |
330 | |
331 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_GROUP)) | |
332 | { | |
333 | group = peer->group; | |
334 | for (ALL_LIST_ELEMENTS (group->peer, node, nnode, peer)) | |
335 | { | |
7f342629 | 336 | command = 0; |
68fe91d6 | 337 | bfd_set_param((struct bfd_info **)&(peer->bfd_info), min_rx, min_tx, |
338 | detect_mult, defaults, &command); | |
c43ed2e4 | 339 | |
7f342629 DS |
340 | if ((peer->status == Established) && |
341 | (command == ZEBRA_BFD_DEST_REGISTER)) | |
c43ed2e4 | 342 | bgp_bfd_register_peer(peer); |
7f342629 | 343 | else if (command == ZEBRA_BFD_DEST_UPDATE) |
c43ed2e4 DS |
344 | bgp_bfd_update_peer(peer); |
345 | } | |
346 | } | |
7f342629 | 347 | else |
c43ed2e4 | 348 | { |
7f342629 DS |
349 | if ((peer->status == Established) && |
350 | (command == ZEBRA_BFD_DEST_REGISTER)) | |
c43ed2e4 | 351 | bgp_bfd_register_peer(peer); |
7f342629 | 352 | else if (command == ZEBRA_BFD_DEST_UPDATE) |
c43ed2e4 DS |
353 | bgp_bfd_update_peer(peer); |
354 | } | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /* | |
359 | * bgp_bfd_peer_param_unset - Unset the configured BFD paramter values for peer. | |
360 | */ | |
7f342629 | 361 | static int |
c43ed2e4 DS |
362 | bgp_bfd_peer_param_unset (struct peer *peer) |
363 | { | |
364 | struct peer_group *group; | |
365 | struct listnode *node, *nnode; | |
c43ed2e4 | 366 | |
7f342629 DS |
367 | if (!peer->bfd_info) |
368 | return 0; | |
c43ed2e4 DS |
369 | |
370 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_GROUP)) | |
371 | { | |
7f342629 | 372 | bfd_info_free(&(peer->bfd_info)); |
c43ed2e4 DS |
373 | group = peer->group; |
374 | for (ALL_LIST_ELEMENTS (group->peer, node, nnode, peer)) | |
375 | { | |
c43ed2e4 | 376 | bgp_bfd_deregister_peer(peer); |
7f342629 | 377 | bfd_info_free(&(peer->bfd_info)); |
c43ed2e4 DS |
378 | } |
379 | } | |
380 | else | |
7f342629 DS |
381 | { |
382 | bgp_bfd_deregister_peer(peer); | |
383 | bfd_info_free(&(peer->bfd_info)); | |
384 | } | |
c43ed2e4 DS |
385 | return 0; |
386 | } | |
387 | ||
388 | /* | |
389 | * bgp_bfd_peer_config_write - Write the peer BFD configuration. | |
390 | */ | |
391 | void | |
392 | bgp_bfd_peer_config_write(struct vty *vty, struct peer *peer, char *addr) | |
393 | { | |
7f342629 | 394 | struct bfd_info *bfd_info; |
c43ed2e4 | 395 | |
7f342629 DS |
396 | if (!peer->bfd_info) |
397 | return; | |
398 | ||
399 | bfd_info = (struct bfd_info *)peer->bfd_info; | |
c43ed2e4 | 400 | |
7f342629 | 401 | if (CHECK_FLAG (bfd_info->flags, BFD_FLAG_PARAM_CFG)) |
c43ed2e4 DS |
402 | vty_out (vty, " neighbor %s bfd %d %d %d%s", addr, |
403 | bfd_info->detect_mult, bfd_info->required_min_rx, | |
404 | bfd_info->desired_min_tx, VTY_NEWLINE); | |
405 | else | |
406 | vty_out (vty, " neighbor %s bfd%s", addr, VTY_NEWLINE); | |
407 | } | |
408 | ||
409 | /* | |
410 | * bgp_bfd_show_info - Show the peer BFD information. | |
411 | */ | |
412 | void | |
856ca177 | 413 | bgp_bfd_show_info(struct vty *vty, struct peer *peer, u_char use_json, json_object *json_neigh) |
c43ed2e4 | 414 | { |
68fe91d6 | 415 | bfd_show_info(vty, (struct bfd_info *)peer->bfd_info, |
416 | bgp_bfd_is_peer_multihop(peer), 0, use_json, json_neigh); | |
c43ed2e4 DS |
417 | } |
418 | ||
419 | DEFUN (neighbor_bfd, | |
420 | neighbor_bfd_cmd, | |
421 | NEIGHBOR_CMD2 "bfd", | |
422 | NEIGHBOR_STR | |
423 | NEIGHBOR_ADDR_STR2 | |
424 | "Enables BFD support\n") | |
425 | { | |
426 | struct peer *peer; | |
427 | int ret; | |
c43ed2e4 DS |
428 | |
429 | peer = peer_and_group_lookup_vty (vty, argv[0]); | |
430 | if (! peer) | |
431 | return CMD_WARNING; | |
432 | ||
7f342629 DS |
433 | ret = bgp_bfd_peer_param_set (peer, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX, |
434 | BFD_DEF_DETECT_MULT, 1); | |
c43ed2e4 DS |
435 | if (ret != 0) |
436 | return bgp_vty_return (vty, ret); | |
437 | ||
438 | return CMD_SUCCESS; | |
439 | ||
440 | } | |
441 | ||
442 | DEFUN (neighbor_bfd_param, | |
443 | neighbor_bfd_param_cmd, | |
7f342629 | 444 | NEIGHBOR_CMD2 "bfd " BFD_CMD_DETECT_MULT_RANGE BFD_CMD_MIN_RX_RANGE BFD_CMD_MIN_TX_RANGE, |
c43ed2e4 DS |
445 | NEIGHBOR_STR |
446 | NEIGHBOR_ADDR_STR2 | |
447 | "Enables BFD support\n" | |
448 | "Detect Multiplier\n" | |
449 | "Required min receive interval\n" | |
450 | "Desired min transmit interval\n") | |
451 | { | |
452 | struct peer *peer; | |
453 | u_int32_t rx_val; | |
454 | u_int32_t tx_val; | |
455 | u_int8_t dm_val; | |
456 | int ret; | |
c43ed2e4 DS |
457 | |
458 | peer = peer_and_group_lookup_vty (vty, argv[0]); | |
459 | if (!peer) | |
460 | return CMD_WARNING; | |
461 | ||
7f342629 DS |
462 | if ((ret = bfd_validate_param (vty, argv[1], argv[2], argv[3], &dm_val, |
463 | &rx_val, &tx_val)) != CMD_SUCCESS) | |
464 | return ret; | |
c43ed2e4 | 465 | |
7f342629 | 466 | ret = bgp_bfd_peer_param_set (peer, rx_val, tx_val, dm_val, 0); |
c43ed2e4 DS |
467 | if (ret != 0) |
468 | return bgp_vty_return (vty, ret); | |
469 | ||
470 | return CMD_SUCCESS; | |
471 | ||
472 | } | |
473 | ||
474 | DEFUN (no_neighbor_bfd, | |
475 | no_neighbor_bfd_cmd, | |
476 | NO_NEIGHBOR_CMD2 "bfd", | |
477 | NO_STR | |
478 | NEIGHBOR_STR | |
479 | NEIGHBOR_ADDR_STR2 | |
480 | "Disables BFD support\n") | |
481 | { | |
482 | struct peer *peer; | |
483 | int ret; | |
484 | ||
485 | peer = peer_and_group_lookup_vty (vty, argv[0]); | |
486 | if (! peer) | |
487 | return CMD_WARNING; | |
488 | ||
c43ed2e4 DS |
489 | ret = bgp_bfd_peer_param_unset(peer); |
490 | if (ret != 0) | |
491 | return bgp_vty_return (vty, ret); | |
492 | ||
c43ed2e4 DS |
493 | return CMD_SUCCESS; |
494 | } | |
495 | ||
496 | void | |
497 | bgp_bfd_init(void) | |
498 | { | |
499 | /* Initialize BFD client functions */ | |
68fe91d6 | 500 | zclient->interface_bfd_dest_update = bgp_bfd_dest_update; |
c43ed2e4 DS |
501 | zclient->bfd_dest_replay = bgp_bfd_dest_replay; |
502 | ||
503 | /* "neighbor bfd" commands. */ | |
504 | install_element (BGP_NODE, &neighbor_bfd_cmd); | |
505 | install_element (BGP_NODE, &neighbor_bfd_param_cmd); | |
506 | install_element (BGP_NODE, &no_neighbor_bfd_cmd); | |
507 | } |