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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 *
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
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
49 /*
50 * ospf_bfd_info_free - Free BFD info structure
51 */
52 void ospf_bfd_info_free(void **bfd_info)
53 {
54 bfd_info_free((struct bfd_info **)bfd_info);
55 }
56
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 */
62 static void ospf_bfd_reg_dereg_nbr(struct ospf_neighbor *nbr, int command)
63 {
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 int cbit;
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))
79 zlog_debug("%s nbr (%s) with BFD. OSPF vrf %s",
80 bfd_get_command_dbg_str(command),
81 inet_ntoa(nbr->src),
82 ospf_vrf_id_to_name(oi->ospf->vrf_id));
83
84 cbit = CHECK_FLAG(bfd_info->flags, BFD_FLAG_BFD_CBIT_ON);
85
86 bfd_peer_sendmsg(zclient, bfd_info, AF_INET, &nbr->src, NULL, ifp->name,
87 0, 0, cbit, command, 0, oi->ospf->vrf_id);
88 }
89
90 /*
91 * ospf_bfd_trigger_event - Neighbor is registered/deregistered with BFD when
92 * neighbor state is changed to/from 2way.
93 */
94 void ospf_bfd_trigger_event(struct ospf_neighbor *nbr, int old_state, int state)
95 {
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);
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 */
108 static int ospf_bfd_reg_dereg_all_nbr(struct interface *ifp, int command)
109 {
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;
141 }
142
143 /*
144 * ospf_bfd_nbr_replay - Replay all the neighbors that have BFD enabled
145 * to zebra
146 */
147 static int ospf_bfd_nbr_replay(ZAPI_CALLBACK_ARGS)
148 {
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 */
162 bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, vrf_id);
163
164 /* Replay the neighbor, if BFD is enabled in OSPF */
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;
192 }
193
194 /*
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.
199 */
200 static int ospf_bfd_interface_dest_update(ZAPI_CALLBACK_ARGS)
201 {
202 struct interface *ifp;
203 struct ospf_interface *oi;
204 struct ospf_if_params *params;
205 struct ospf_neighbor *nbr;
206 struct route_node *node;
207 struct prefix p;
208 int status;
209 int old_status;
210 struct bfd_info *bfd_info;
211 struct timeval tv;
212
213 ifp = bfd_get_peer_info(zclient->ibuf, &p, NULL, &status,
214 NULL, vrf_id);
215
216 if ((ifp == NULL) || (p.family != AF_INET))
217 return 0;
218
219 if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) {
220 char buf[PREFIX2STR_BUFFER];
221 prefix2str(&p, buf, sizeof(buf));
222 zlog_debug("Zebra: interface %s bfd destination %s %s",
223 ifp->name, buf, bfd_get_status_str(status));
224 }
225
226 params = IF_DEF_PARAMS(ifp);
227 if (!params->bfd_info)
228 return 0;
229
230 for (node = route_top(IF_OIFS(ifp)); node; node = route_next(node)) {
231 if ((oi = node->info) == NULL)
232 continue;
233
234 nbr = ospf_nbr_lookup_by_addr(oi->nbrs, &p.u.prefix4);
235 if (!nbr || !nbr->bfd_info)
236 continue;
237
238 bfd_info = (struct bfd_info *)nbr->bfd_info;
239 if (bfd_info->status == status)
240 continue;
241
242 old_status = bfd_info->status;
243 BFD_SET_CLIENT_STATUS(bfd_info->status, status);
244 monotime(&tv);
245 bfd_info->last_update = tv.tv_sec;
246
247 if ((status == BFD_STATUS_DOWN)
248 && (old_status == BFD_STATUS_UP)) {
249 if (IS_DEBUG_OSPF(nsm, NSM_EVENTS))
250 zlog_debug("NSM[%s:%s]: BFD Down",
251 IF_NAME(nbr->oi),
252 inet_ntoa(nbr->address.u.prefix4));
253
254 OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_InactivityTimer);
255 }
256 if ((status == BFD_STATUS_UP)
257 && (old_status == BFD_STATUS_DOWN)) {
258 if (IS_DEBUG_OSPF(nsm, NSM_EVENTS))
259 zlog_debug("NSM[%s:%s]: BFD Up",
260 IF_NAME(nbr->oi),
261 inet_ntoa(nbr->address.u.prefix4));
262 }
263 }
264
265 return 0;
266 }
267
268 /*
269 * ospf_bfd_info_nbr_create - Create/update BFD information for a neighbor.
270 */
271 void ospf_bfd_info_nbr_create(struct ospf_interface *oi,
272 struct ospf_neighbor *nbr)
273 {
274 struct bfd_info *oi_bfd_info;
275 struct bfd_info *nbr_bfd_info;
276 struct interface *ifp = oi->ifp;
277 struct ospf_if_params *params;
278
279 /* Check if BFD is enabled */
280 params = IF_DEF_PARAMS(ifp);
281
282 /* Check if BFD is enabled */
283 if (!params->bfd_info)
284 return;
285
286 oi_bfd_info = (struct bfd_info *)params->bfd_info;
287 if (!nbr->bfd_info)
288 nbr->bfd_info = bfd_info_create();
289
290 nbr_bfd_info = (struct bfd_info *)nbr->bfd_info;
291 nbr_bfd_info->detect_mult = oi_bfd_info->detect_mult;
292 nbr_bfd_info->desired_min_tx = oi_bfd_info->desired_min_tx;
293 nbr_bfd_info->required_min_rx = oi_bfd_info->required_min_rx;
294 }
295
296 /*
297 * ospf_bfd_write_config - Write the interface BFD configuration.
298 */
299 void ospf_bfd_write_config(struct vty *vty, struct ospf_if_params *params)
300
301 {
302 #if HAVE_BFDD == 0
303 struct bfd_info *bfd_info;
304 #endif /* ! HAVE_BFDD */
305
306 if (!params->bfd_info)
307 return;
308
309 #if HAVE_BFDD == 0
310 bfd_info = (struct bfd_info *)params->bfd_info;
311
312 if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
313 vty_out(vty, " ip ospf bfd %d %d %d\n", bfd_info->detect_mult,
314 bfd_info->required_min_rx, bfd_info->desired_min_tx);
315 else
316 #endif /* ! HAVE_BFDD */
317 vty_out(vty, " ip ospf bfd\n");
318 }
319
320 /*
321 * ospf_bfd_show_info - Show BFD info structure
322 */
323 void ospf_bfd_show_info(struct vty *vty, void *bfd_info, json_object *json_obj,
324 bool use_json, int param_only)
325 {
326 if (param_only)
327 bfd_show_param(vty, (struct bfd_info *)bfd_info, 1, 0, use_json,
328 json_obj);
329 else
330 bfd_show_info(vty, (struct bfd_info *)bfd_info, 0, 1, use_json,
331 json_obj);
332 }
333
334 /*
335 * ospf_bfd_interface_show - Show the interface BFD configuration.
336 */
337 void ospf_bfd_interface_show(struct vty *vty, struct interface *ifp,
338 json_object *json_interface_sub, bool use_json)
339 {
340 struct ospf_if_params *params;
341
342 params = IF_DEF_PARAMS(ifp);
343
344 ospf_bfd_show_info(vty, params->bfd_info, json_interface_sub, use_json,
345 1);
346 }
347
348 /*
349 * ospf_bfd_if_param_set - Set the configured BFD paramter values for
350 * interface.
351 */
352 static void ospf_bfd_if_param_set(struct interface *ifp, uint32_t min_rx,
353 uint32_t min_tx, uint8_t detect_mult,
354 int defaults)
355 {
356 struct ospf_if_params *params;
357 int command = 0;
358
359 params = IF_DEF_PARAMS(ifp);
360
361 bfd_set_param((struct bfd_info **)&(params->bfd_info), min_rx, min_tx,
362 detect_mult, defaults, &command);
363 if (command)
364 ospf_bfd_reg_dereg_all_nbr(ifp, command);
365 }
366
367 DEFUN (ip_ospf_bfd,
368 ip_ospf_bfd_cmd,
369 "ip ospf bfd",
370 "IP Information\n"
371 "OSPF interface commands\n"
372 "Enables BFD support\n")
373 {
374 VTY_DECLVAR_CONTEXT(interface, ifp);
375 struct ospf_if_params *params;
376 struct bfd_info *bfd_info;
377
378 assert(ifp);
379 params = IF_DEF_PARAMS(ifp);
380 bfd_info = params->bfd_info;
381
382 if (!bfd_info || !CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG))
383 ospf_bfd_if_param_set(ifp, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
384 BFD_DEF_DETECT_MULT, 1);
385
386 return CMD_SUCCESS;
387 }
388
389 #if HAVE_BFDD > 0
390 DEFUN_HIDDEN(
391 #else
392 DEFUN(
393 #endif /* HAVE_BFDD */
394 ip_ospf_bfd_param,
395 ip_ospf_bfd_param_cmd,
396 "ip ospf bfd (2-255) (50-60000) (50-60000)",
397 "IP Information\n"
398 "OSPF interface commands\n"
399 "Enables BFD support\n"
400 "Detect Multiplier\n"
401 "Required min receive interval\n"
402 "Desired min transmit interval\n")
403 {
404 VTY_DECLVAR_CONTEXT(interface, ifp);
405 int idx_number = 3;
406 int idx_number_2 = 4;
407 int idx_number_3 = 5;
408 uint32_t rx_val;
409 uint32_t tx_val;
410 uint8_t dm_val;
411 int ret;
412
413 assert(ifp);
414
415 if ((ret = bfd_validate_param(
416 vty, argv[idx_number]->arg, argv[idx_number_2]->arg,
417 argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val))
418 != CMD_SUCCESS)
419 return ret;
420
421 ospf_bfd_if_param_set(ifp, rx_val, tx_val, dm_val, 0);
422
423 return CMD_SUCCESS;
424 }
425
426 DEFUN (no_ip_ospf_bfd,
427 no_ip_ospf_bfd_cmd,
428 #if HAVE_BFDD > 0
429 "no ip ospf bfd",
430 #else
431 "no ip ospf bfd [(2-255) (50-60000) (50-60000)]",
432 #endif /* HAVE_BFDD */
433 NO_STR
434 "IP Information\n"
435 "OSPF interface commands\n"
436 "Disables BFD support\n"
437 #if HAVE_BFDD == 0
438 "Detect Multiplier\n"
439 "Required min receive interval\n"
440 "Desired min transmit interval\n"
441 #endif /* !HAVE_BFDD */
442 )
443 {
444 VTY_DECLVAR_CONTEXT(interface, ifp);
445 struct ospf_if_params *params;
446
447 assert(ifp);
448
449 params = IF_DEF_PARAMS(ifp);
450 if (params->bfd_info) {
451 ospf_bfd_reg_dereg_all_nbr(ifp, ZEBRA_BFD_DEST_DEREGISTER);
452 bfd_info_free(&(params->bfd_info));
453 }
454
455 return CMD_SUCCESS;
456 }
457
458 void ospf_bfd_init(void)
459 {
460 bfd_gbl_init();
461
462 /* Initialize BFD client functions */
463 zclient->interface_bfd_dest_update = ospf_bfd_interface_dest_update;
464 zclient->bfd_dest_replay = ospf_bfd_nbr_replay;
465
466 /* Install BFD command */
467 install_element(INTERFACE_NODE, &ip_ospf_bfd_cmd);
468 install_element(INTERFACE_NODE, &ip_ospf_bfd_param_cmd);
469 install_element(INTERFACE_NODE, &no_ip_ospf_bfd_cmd);
470 }