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7f342629 DS |
1 | /** |
2 | * ospf_bfd.c: OSPF 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 | * | |
896014f4 DL |
18 | * You should have received a copy of the GNU General Public License along |
19 | * with this program; see the file COPYING; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
7f342629 DS |
21 | */ |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "command.h" | |
26 | #include "linklist.h" | |
27 | #include "memory.h" | |
28 | #include "prefix.h" | |
29 | #include "thread.h" | |
30 | #include "buffer.h" | |
31 | #include "stream.h" | |
32 | #include "zclient.h" | |
33 | #include "vty.h" | |
34 | #include "table.h" | |
35 | #include "bfd.h" | |
36 | #include "ospfd.h" | |
37 | #include "ospf_asbr.h" | |
38 | #include "ospf_lsa.h" | |
39 | #include "ospf_lsdb.h" | |
40 | #include "ospf_neighbor.h" | |
41 | #include "ospf_interface.h" | |
42 | #include "ospf_nsm.h" | |
43 | #include "ospf_bfd.h" | |
44 | #include "ospf_dump.h" | |
45 | #include "ospf_vty.h" | |
46 | ||
47 | extern struct zclient *zclient; | |
48 | ||
68fe91d6 | 49 | /* |
50 | * ospf_bfd_info_free - Free BFD info structure | |
51 | */ | |
d62a17ae | 52 | void ospf_bfd_info_free(void **bfd_info) |
68fe91d6 | 53 | { |
d62a17ae | 54 | bfd_info_free((struct bfd_info **)bfd_info); |
68fe91d6 | 55 | } |
56 | ||
7f342629 DS |
57 | /* |
58 | * ospf_bfd_reg_dereg_nbr - Register/Deregister a neighbor with BFD through | |
59 | * zebra for starting/stopping the monitoring of | |
60 | * the neighbor rechahability. | |
61 | */ | |
d62a17ae | 62 | static void ospf_bfd_reg_dereg_nbr(struct ospf_neighbor *nbr, int command) |
7f342629 | 63 | { |
d62a17ae | 64 | struct ospf_interface *oi = nbr->oi; |
65 | struct interface *ifp = oi->ifp; | |
66 | struct ospf_if_params *params; | |
67 | struct bfd_info *bfd_info; | |
9beff0bd | 68 | int cbit; |
d62a17ae | 69 | |
70 | /* Check if BFD is enabled */ | |
71 | params = IF_DEF_PARAMS(ifp); | |
72 | ||
73 | /* Check if BFD is enabled */ | |
74 | if (!params->bfd_info) | |
75 | return; | |
76 | bfd_info = (struct bfd_info *)params->bfd_info; | |
77 | ||
78 | if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) | |
b5a8894d | 79 | zlog_debug("%s nbr (%s) with BFD. OSPF vrf %s", |
d62a17ae | 80 | bfd_get_command_dbg_str(command), |
b5a8894d CS |
81 | inet_ntoa(nbr->src), |
82 | ospf_vrf_id_to_name(oi->ospf->vrf_id)); | |
d62a17ae | 83 | |
9beff0bd PG |
84 | cbit = CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_CBIT_ON); |
85 | ||
d62a17ae | 86 | bfd_peer_sendmsg(zclient, bfd_info, AF_INET, &nbr->src, NULL, ifp->name, |
9beff0bd | 87 | 0, 0, cbit, command, 0, oi->ospf->vrf_id); |
7f342629 DS |
88 | } |
89 | ||
90 | /* | |
91 | * ospf_bfd_trigger_event - Neighbor is registered/deregistered with BFD when | |
92 | * neighbor state is changed to/from 2way. | |
93 | */ | |
d62a17ae | 94 | void ospf_bfd_trigger_event(struct ospf_neighbor *nbr, int old_state, int state) |
7f342629 | 95 | { |
d62a17ae | 96 | if ((old_state < NSM_TwoWay) && (state >= NSM_TwoWay)) |
97 | ospf_bfd_reg_dereg_nbr(nbr, ZEBRA_BFD_DEST_REGISTER); | |
98 | else if ((old_state >= NSM_TwoWay) && (state < NSM_TwoWay)) | |
99 | ospf_bfd_reg_dereg_nbr(nbr, ZEBRA_BFD_DEST_DEREGISTER); | |
7f342629 DS |
100 | } |
101 | ||
102 | /* | |
103 | * ospf_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated | |
104 | * with a interface with BFD through | |
105 | * zebra for starting/stopping the monitoring of | |
106 | * the neighbor rechahability. | |
107 | */ | |
d62a17ae | 108 | static int ospf_bfd_reg_dereg_all_nbr(struct interface *ifp, int command) |
7f342629 | 109 | { |
d62a17ae | 110 | struct ospf_interface *oi; |
111 | struct route_table *nbrs; | |
112 | struct ospf_neighbor *nbr; | |
113 | struct route_node *irn; | |
114 | struct route_node *nrn; | |
115 | ||
116 | for (irn = route_top(IF_OIFS(ifp)); irn; irn = route_next(irn)) { | |
117 | if ((oi = irn->info) == NULL) | |
118 | continue; | |
119 | ||
120 | if ((nbrs = oi->nbrs) == NULL) | |
121 | continue; | |
122 | ||
123 | for (nrn = route_top(nbrs); nrn; nrn = route_next(nrn)) { | |
124 | if ((nbr = nrn->info) == NULL || nbr == oi->nbr_self) | |
125 | continue; | |
126 | ||
127 | if (command != ZEBRA_BFD_DEST_DEREGISTER) | |
128 | ospf_bfd_info_nbr_create(oi, nbr); | |
129 | else | |
130 | bfd_info_free( | |
131 | (struct bfd_info **)&nbr->bfd_info); | |
132 | ||
133 | if (nbr->state < NSM_TwoWay) | |
134 | continue; | |
135 | ||
136 | ospf_bfd_reg_dereg_nbr(nbr, command); | |
137 | } | |
138 | } | |
139 | ||
140 | return 0; | |
7f342629 DS |
141 | } |
142 | ||
143 | /* | |
144 | * ospf_bfd_nbr_replay - Replay all the neighbors that have BFD enabled | |
145 | * to zebra | |
146 | */ | |
121f9dee | 147 | static int ospf_bfd_nbr_replay(ZAPI_CALLBACK_ARGS) |
7f342629 | 148 | { |
d62a17ae | 149 | struct listnode *inode, *node, *onode; |
150 | struct ospf *ospf; | |
151 | struct ospf_interface *oi; | |
152 | struct route_table *nbrs; | |
153 | struct route_node *rn; | |
154 | struct ospf_neighbor *nbr; | |
155 | struct ospf_if_params *params; | |
156 | ||
157 | if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) { | |
158 | zlog_debug("Zebra: BFD Dest replay request"); | |
159 | } | |
160 | ||
161 | /* Send the client registration */ | |
0945d5ed | 162 | bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, vrf_id); |
d62a17ae | 163 | |
b5a8894d | 164 | /* Replay the neighbor, if BFD is enabled in OSPF */ |
d62a17ae | 165 | for (ALL_LIST_ELEMENTS(om->ospf, node, onode, ospf)) { |
166 | for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, inode, oi)) { | |
167 | if ((nbrs = oi->nbrs) == NULL) | |
168 | continue; | |
169 | ||
170 | params = IF_DEF_PARAMS(oi->ifp); | |
171 | if (!params->bfd_info) | |
172 | continue; | |
173 | ||
174 | for (rn = route_top(nbrs); rn; rn = route_next(rn)) { | |
175 | if ((nbr = rn->info) == NULL | |
176 | || nbr == oi->nbr_self) | |
177 | continue; | |
178 | ||
179 | if (nbr->state < NSM_TwoWay) | |
180 | continue; | |
181 | ||
182 | if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) | |
183 | zlog_debug("Replaying nbr (%s) to BFD", | |
184 | inet_ntoa(nbr->src)); | |
185 | ||
186 | ospf_bfd_reg_dereg_nbr(nbr, | |
187 | ZEBRA_BFD_DEST_UPDATE); | |
188 | } | |
189 | } | |
190 | } | |
191 | return 0; | |
7f342629 DS |
192 | } |
193 | ||
194 | /* | |
68fe91d6 | 195 | * ospf_bfd_interface_dest_update - Find the neighbor for which the BFD status |
196 | * has changed and bring down the neighbor | |
197 | * connectivity if the BFD status changed to | |
198 | * down. | |
7f342629 | 199 | */ |
121f9dee | 200 | static int ospf_bfd_interface_dest_update(ZAPI_CALLBACK_ARGS) |
7f342629 | 201 | { |
d62a17ae | 202 | struct interface *ifp; |
203 | struct ospf_interface *oi; | |
204 | struct ospf_if_params *params; | |
6e641a8f | 205 | struct ospf_neighbor *nbr = NULL; |
d62a17ae | 206 | struct route_node *node; |
6e641a8f | 207 | struct route_node *n_node; |
d62a17ae | 208 | struct prefix p; |
209 | int status; | |
210 | int old_status; | |
211 | struct bfd_info *bfd_info; | |
212 | struct timeval tv; | |
213 | ||
9beff0bd PG |
214 | ifp = bfd_get_peer_info(zclient->ibuf, &p, NULL, &status, |
215 | NULL, vrf_id); | |
d62a17ae | 216 | |
217 | if ((ifp == NULL) || (p.family != AF_INET)) | |
218 | return 0; | |
219 | ||
220 | if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) { | |
221 | char buf[PREFIX2STR_BUFFER]; | |
222 | prefix2str(&p, buf, sizeof(buf)); | |
223 | zlog_debug("Zebra: interface %s bfd destination %s %s", | |
224 | ifp->name, buf, bfd_get_status_str(status)); | |
225 | } | |
226 | ||
227 | params = IF_DEF_PARAMS(ifp); | |
228 | if (!params->bfd_info) | |
229 | return 0; | |
230 | ||
231 | for (node = route_top(IF_OIFS(ifp)); node; node = route_next(node)) { | |
232 | if ((oi = node->info) == NULL) | |
233 | continue; | |
234 | ||
6e641a8f RM |
235 | /* walk the neighbor list for point-to-point network */ |
236 | if (oi->type == OSPF_IFTYPE_POINTOPOINT) { | |
237 | for (n_node = route_top(oi->nbrs); n_node; | |
238 | n_node = route_next(n_node)) { | |
239 | nbr = n_node->info; | |
240 | if (nbr) { | |
241 | /* skip myself */ | |
242 | if (nbr == oi->nbr_self) { | |
243 | nbr = NULL; | |
244 | continue; | |
245 | } | |
246 | ||
247 | /* Found the matching neighbor */ | |
248 | if (nbr->src.s_addr == | |
249 | p.u.prefix4.s_addr) | |
250 | break; | |
251 | } | |
252 | } | |
253 | } else { | |
254 | nbr = ospf_nbr_lookup_by_addr(oi->nbrs, &p.u.prefix4); | |
255 | } | |
256 | ||
d62a17ae | 257 | if (!nbr || !nbr->bfd_info) |
258 | continue; | |
259 | ||
260 | bfd_info = (struct bfd_info *)nbr->bfd_info; | |
261 | if (bfd_info->status == status) | |
262 | continue; | |
263 | ||
264 | old_status = bfd_info->status; | |
7555dc61 | 265 | BFD_SET_CLIENT_STATUS(bfd_info->status, status); |
d62a17ae | 266 | monotime(&tv); |
267 | bfd_info->last_update = tv.tv_sec; | |
268 | ||
269 | if ((status == BFD_STATUS_DOWN) | |
270 | && (old_status == BFD_STATUS_UP)) { | |
271 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
272 | zlog_debug("NSM[%s:%s]: BFD Down", | |
273 | IF_NAME(nbr->oi), | |
274 | inet_ntoa(nbr->address.u.prefix4)); | |
275 | ||
276 | OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_InactivityTimer); | |
277 | } | |
4828ea77 PG |
278 | if ((status == BFD_STATUS_UP) |
279 | && (old_status == BFD_STATUS_DOWN)) { | |
280 | if (IS_DEBUG_OSPF(nsm, NSM_EVENTS)) | |
281 | zlog_debug("NSM[%s:%s]: BFD Up", | |
282 | IF_NAME(nbr->oi), | |
283 | inet_ntoa(nbr->address.u.prefix4)); | |
284 | } | |
d62a17ae | 285 | } |
286 | ||
287 | return 0; | |
7f342629 DS |
288 | } |
289 | ||
68fe91d6 | 290 | /* |
291 | * ospf_bfd_info_nbr_create - Create/update BFD information for a neighbor. | |
292 | */ | |
d62a17ae | 293 | void ospf_bfd_info_nbr_create(struct ospf_interface *oi, |
294 | struct ospf_neighbor *nbr) | |
68fe91d6 | 295 | { |
d62a17ae | 296 | struct bfd_info *oi_bfd_info; |
297 | struct bfd_info *nbr_bfd_info; | |
298 | struct interface *ifp = oi->ifp; | |
299 | struct ospf_if_params *params; | |
300 | ||
301 | /* Check if BFD is enabled */ | |
302 | params = IF_DEF_PARAMS(ifp); | |
303 | ||
304 | /* Check if BFD is enabled */ | |
305 | if (!params->bfd_info) | |
306 | return; | |
307 | ||
308 | oi_bfd_info = (struct bfd_info *)params->bfd_info; | |
309 | if (!nbr->bfd_info) | |
310 | nbr->bfd_info = bfd_info_create(); | |
311 | ||
312 | nbr_bfd_info = (struct bfd_info *)nbr->bfd_info; | |
313 | nbr_bfd_info->detect_mult = oi_bfd_info->detect_mult; | |
314 | nbr_bfd_info->desired_min_tx = oi_bfd_info->desired_min_tx; | |
315 | nbr_bfd_info->required_min_rx = oi_bfd_info->required_min_rx; | |
68fe91d6 | 316 | } |
317 | ||
7f342629 DS |
318 | /* |
319 | * ospf_bfd_write_config - Write the interface BFD configuration. | |
320 | */ | |
d62a17ae | 321 | void ospf_bfd_write_config(struct vty *vty, struct ospf_if_params *params) |
7f342629 DS |
322 | |
323 | { | |
a0841732 | 324 | #if HAVE_BFDD == 0 |
d62a17ae | 325 | struct bfd_info *bfd_info; |
a0841732 | 326 | #endif /* ! HAVE_BFDD */ |
7f342629 | 327 | |
d62a17ae | 328 | if (!params->bfd_info) |
329 | return; | |
7f342629 | 330 | |
a0841732 | 331 | #if HAVE_BFDD == 0 |
d62a17ae | 332 | bfd_info = (struct bfd_info *)params->bfd_info; |
7f342629 | 333 | |
d62a17ae | 334 | if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG)) |
335 | vty_out(vty, " ip ospf bfd %d %d %d\n", bfd_info->detect_mult, | |
336 | bfd_info->required_min_rx, bfd_info->desired_min_tx); | |
337 | else | |
a0841732 | 338 | #endif /* ! HAVE_BFDD */ |
d62a17ae | 339 | vty_out(vty, " ip ospf bfd\n"); |
7f342629 DS |
340 | } |
341 | ||
68fe91d6 | 342 | /* |
343 | * ospf_bfd_show_info - Show BFD info structure | |
344 | */ | |
d62a17ae | 345 | void ospf_bfd_show_info(struct vty *vty, void *bfd_info, json_object *json_obj, |
9f049418 | 346 | bool use_json, int param_only) |
68fe91d6 | 347 | { |
d62a17ae | 348 | if (param_only) |
349 | bfd_show_param(vty, (struct bfd_info *)bfd_info, 1, 0, use_json, | |
350 | json_obj); | |
351 | else | |
352 | bfd_show_info(vty, (struct bfd_info *)bfd_info, 0, 1, use_json, | |
353 | json_obj); | |
68fe91d6 | 354 | } |
355 | ||
356 | /* | |
357 | * ospf_bfd_interface_show - Show the interface BFD configuration. | |
358 | */ | |
d62a17ae | 359 | void ospf_bfd_interface_show(struct vty *vty, struct interface *ifp, |
9f049418 | 360 | json_object *json_interface_sub, bool use_json) |
68fe91d6 | 361 | { |
d62a17ae | 362 | struct ospf_if_params *params; |
68fe91d6 | 363 | |
d62a17ae | 364 | params = IF_DEF_PARAMS(ifp); |
68fe91d6 | 365 | |
d62a17ae | 366 | ospf_bfd_show_info(vty, params->bfd_info, json_interface_sub, use_json, |
367 | 1); | |
68fe91d6 | 368 | } |
7f342629 DS |
369 | |
370 | /* | |
371 | * ospf_bfd_if_param_set - Set the configured BFD paramter values for | |
372 | * interface. | |
373 | */ | |
d7c0a89a QY |
374 | static void ospf_bfd_if_param_set(struct interface *ifp, uint32_t min_rx, |
375 | uint32_t min_tx, uint8_t detect_mult, | |
d62a17ae | 376 | int defaults) |
7f342629 | 377 | { |
d62a17ae | 378 | struct ospf_if_params *params; |
379 | int command = 0; | |
7f342629 | 380 | |
d62a17ae | 381 | params = IF_DEF_PARAMS(ifp); |
7f342629 | 382 | |
d62a17ae | 383 | bfd_set_param((struct bfd_info **)&(params->bfd_info), min_rx, min_tx, |
384 | detect_mult, defaults, &command); | |
385 | if (command) | |
386 | ospf_bfd_reg_dereg_all_nbr(ifp, command); | |
7f342629 DS |
387 | } |
388 | ||
7f342629 DS |
389 | DEFUN (ip_ospf_bfd, |
390 | ip_ospf_bfd_cmd, | |
391 | "ip ospf bfd", | |
392 | "IP Information\n" | |
393 | "OSPF interface commands\n" | |
394 | "Enables BFD support\n") | |
395 | { | |
d62a17ae | 396 | VTY_DECLVAR_CONTEXT(interface, ifp); |
397 | struct ospf_if_params *params; | |
398 | struct bfd_info *bfd_info; | |
7f342629 | 399 | |
d62a17ae | 400 | assert(ifp); |
401 | params = IF_DEF_PARAMS(ifp); | |
402 | bfd_info = params->bfd_info; | |
487f2302 | 403 | |
d62a17ae | 404 | if (!bfd_info || !CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG)) |
405 | ospf_bfd_if_param_set(ifp, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX, | |
406 | BFD_DEF_DETECT_MULT, 1); | |
7f342629 | 407 | |
d62a17ae | 408 | return CMD_SUCCESS; |
7f342629 DS |
409 | } |
410 | ||
64dc4b2d RZ |
411 | #if HAVE_BFDD > 0 |
412 | DEFUN_HIDDEN( | |
413 | #else | |
414 | DEFUN( | |
415 | #endif /* HAVE_BFDD */ | |
416 | ip_ospf_bfd_param, | |
7f342629 | 417 | ip_ospf_bfd_param_cmd, |
9ccf14f7 | 418 | "ip ospf bfd (2-255) (50-60000) (50-60000)", |
7f342629 DS |
419 | "IP Information\n" |
420 | "OSPF interface commands\n" | |
421 | "Enables BFD support\n" | |
422 | "Detect Multiplier\n" | |
423 | "Required min receive interval\n" | |
424 | "Desired min transmit interval\n") | |
425 | { | |
d62a17ae | 426 | VTY_DECLVAR_CONTEXT(interface, ifp); |
427 | int idx_number = 3; | |
428 | int idx_number_2 = 4; | |
429 | int idx_number_3 = 5; | |
d7c0a89a QY |
430 | uint32_t rx_val; |
431 | uint32_t tx_val; | |
432 | uint8_t dm_val; | |
d62a17ae | 433 | int ret; |
434 | ||
435 | assert(ifp); | |
436 | ||
437 | if ((ret = bfd_validate_param( | |
438 | vty, argv[idx_number]->arg, argv[idx_number_2]->arg, | |
439 | argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val)) | |
440 | != CMD_SUCCESS) | |
441 | return ret; | |
442 | ||
443 | ospf_bfd_if_param_set(ifp, rx_val, tx_val, dm_val, 0); | |
444 | ||
445 | return CMD_SUCCESS; | |
7f342629 DS |
446 | } |
447 | ||
448 | DEFUN (no_ip_ospf_bfd, | |
449 | no_ip_ospf_bfd_cmd, | |
64dc4b2d RZ |
450 | #if HAVE_BFDD > 0 |
451 | "no ip ospf bfd", | |
452 | #else | |
692b4c65 | 453 | "no ip ospf bfd [(2-255) (50-60000) (50-60000)]", |
64dc4b2d | 454 | #endif /* HAVE_BFDD */ |
7f342629 DS |
455 | NO_STR |
456 | "IP Information\n" | |
457 | "OSPF interface commands\n" | |
692b4c65 | 458 | "Disables BFD support\n" |
64dc4b2d | 459 | #if HAVE_BFDD == 0 |
692b4c65 QY |
460 | "Detect Multiplier\n" |
461 | "Required min receive interval\n" | |
64dc4b2d RZ |
462 | "Desired min transmit interval\n" |
463 | #endif /* !HAVE_BFDD */ | |
464 | ) | |
7f342629 | 465 | { |
d62a17ae | 466 | VTY_DECLVAR_CONTEXT(interface, ifp); |
467 | struct ospf_if_params *params; | |
7f342629 | 468 | |
d62a17ae | 469 | assert(ifp); |
7f342629 | 470 | |
d62a17ae | 471 | params = IF_DEF_PARAMS(ifp); |
472 | if (params->bfd_info) { | |
473 | ospf_bfd_reg_dereg_all_nbr(ifp, ZEBRA_BFD_DEST_DEREGISTER); | |
474 | bfd_info_free(&(params->bfd_info)); | |
475 | } | |
7f342629 | 476 | |
d62a17ae | 477 | return CMD_SUCCESS; |
7f342629 DS |
478 | } |
479 | ||
d62a17ae | 480 | void ospf_bfd_init(void) |
7f342629 | 481 | { |
d62a17ae | 482 | bfd_gbl_init(); |
567b877d | 483 | |
d62a17ae | 484 | /* Initialize BFD client functions */ |
485 | zclient->interface_bfd_dest_update = ospf_bfd_interface_dest_update; | |
486 | zclient->bfd_dest_replay = ospf_bfd_nbr_replay; | |
7f342629 | 487 | |
d62a17ae | 488 | /* Install BFD command */ |
489 | install_element(INTERFACE_NODE, &ip_ospf_bfd_cmd); | |
490 | install_element(INTERFACE_NODE, &ip_ospf_bfd_param_cmd); | |
491 | install_element(INTERFACE_NODE, &no_ip_ospf_bfd_cmd); | |
7f342629 | 492 | } |