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