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