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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 | * | |
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" | |
35 | #include "table.h" | |
36 | #include "bfd.h" | |
37 | #include "ospfd.h" | |
38 | #include "ospf_asbr.h" | |
39 | #include "ospf_lsa.h" | |
40 | #include "ospf_lsdb.h" | |
41 | #include "ospf_neighbor.h" | |
42 | #include "ospf_interface.h" | |
43 | #include "ospf_nsm.h" | |
44 | #include "ospf_bfd.h" | |
45 | #include "ospf_dump.h" | |
46 | #include "ospf_vty.h" | |
47 | ||
48 | extern struct zclient *zclient; | |
49 | ||
68fe91d6 | 50 | /* |
51 | * ospf_bfd_info_free - Free BFD info structure | |
52 | */ | |
53 | void | |
54 | ospf_bfd_info_free(void **bfd_info) | |
55 | { | |
56 | bfd_info_free((struct bfd_info **) bfd_info); | |
57 | } | |
58 | ||
7f342629 DS |
59 | /* |
60 | * ospf_bfd_reg_dereg_nbr - Register/Deregister a neighbor with BFD through | |
61 | * zebra for starting/stopping the monitoring of | |
62 | * the neighbor rechahability. | |
63 | */ | |
64 | static void | |
65 | ospf_bfd_reg_dereg_nbr (struct ospf_neighbor *nbr, int command) | |
66 | { | |
67 | struct ospf_interface *oi = nbr->oi; | |
68 | struct interface *ifp = oi->ifp; | |
69 | struct ospf_if_params *params; | |
70 | struct bfd_info *bfd_info; | |
71 | ||
72 | /* Check if BFD is enabled */ | |
73 | params = IF_DEF_PARAMS (ifp); | |
74 | ||
75 | /* Check if BFD is enabled */ | |
76 | if (!params->bfd_info) | |
77 | return; | |
78 | bfd_info = (struct bfd_info *)params->bfd_info; | |
79 | ||
80 | if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) | |
81 | zlog_debug ("%s nbr (%s) with BFD", | |
82 | bfd_get_command_dbg_str(command), | |
83 | inet_ntoa (nbr->src)); | |
84 | ||
85 | bfd_peer_sendmsg (zclient, bfd_info, AF_INET, | |
7076bb2f | 86 | &nbr->src, NULL, ifp->name, 0, 0, command, 0, VRF_DEFAULT); |
7f342629 DS |
87 | } |
88 | ||
89 | /* | |
90 | * ospf_bfd_trigger_event - Neighbor is registered/deregistered with BFD when | |
91 | * neighbor state is changed to/from 2way. | |
92 | */ | |
93 | void | |
94 | 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 | |
109 | ospf_bfd_reg_dereg_all_nbr (struct interface *ifp, int command) | |
110 | { | |
111 | struct ospf_interface *oi; | |
112 | struct route_table *nbrs; | |
113 | struct ospf_neighbor *nbr; | |
114 | struct route_node *irn; | |
115 | struct route_node *nrn; | |
116 | ||
117 | for (irn = route_top (IF_OIFS (ifp)); irn; irn = route_next (irn)) | |
118 | { | |
119 | if ((oi = irn->info) == NULL) | |
120 | continue; | |
121 | ||
122 | if ((nbrs = oi->nbrs) == NULL) | |
123 | continue; | |
124 | ||
125 | for (nrn = route_top (nbrs); nrn; nrn = route_next (nrn)) | |
126 | { | |
127 | if ((nbr = nrn->info) == NULL || nbr == oi->nbr_self) | |
128 | continue; | |
129 | ||
68fe91d6 | 130 | if (command != ZEBRA_BFD_DEST_DEREGISTER) |
131 | ospf_bfd_info_nbr_create(oi, nbr); | |
132 | else | |
133 | bfd_info_free((struct bfd_info **)&nbr->bfd_info); | |
134 | ||
7f342629 DS |
135 | if (nbr->state < NSM_TwoWay) |
136 | continue; | |
137 | ||
138 | ospf_bfd_reg_dereg_nbr(nbr, command); | |
139 | } | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | /* | |
146 | * ospf_bfd_nbr_replay - Replay all the neighbors that have BFD enabled | |
147 | * to zebra | |
148 | */ | |
149 | static int | |
055c4dfc | 150 | ospf_bfd_nbr_replay (int command, struct zclient *zclient, zebra_size_t length, |
7076bb2f | 151 | vrf_id_t vrf_id) |
7f342629 DS |
152 | { |
153 | struct listnode *inode, *node, *onode; | |
154 | struct ospf *ospf; | |
155 | struct ospf_interface *oi; | |
156 | struct route_table *nbrs; | |
157 | struct route_node *rn; | |
158 | struct ospf_neighbor *nbr; | |
159 | struct ospf_if_params *params; | |
160 | ||
161 | if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) | |
162 | { | |
163 | zlog_debug("Zebra: BFD Dest replay request"); | |
164 | } | |
165 | ||
055c4dfc | 166 | /* Send the client registration */ |
167 | bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER); | |
168 | ||
7f342629 DS |
169 | /* Replay the neighbor, if BFD is enabled in BGP */ |
170 | for (ALL_LIST_ELEMENTS (om->ospf, node, onode, ospf)) | |
171 | { | |
172 | for (ALL_LIST_ELEMENTS_RO (ospf->oiflist, inode, oi)) | |
173 | { | |
174 | if ((nbrs = oi->nbrs) == NULL) | |
175 | continue; | |
176 | ||
177 | params = IF_DEF_PARAMS (oi->ifp); | |
178 | if (!params->bfd_info) | |
179 | continue; | |
180 | ||
181 | for (rn = route_top (nbrs); rn; rn = route_next (rn)) | |
182 | { | |
183 | if ((nbr = rn->info) == NULL || nbr == oi->nbr_self) | |
184 | continue; | |
185 | ||
186 | if (nbr->state < NSM_TwoWay) | |
187 | continue; | |
188 | ||
189 | if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE)) | |
190 | zlog_debug ("Replaying nbr (%s) to BFD", inet_ntoa (nbr->src)); | |
191 | ||
192 | ospf_bfd_reg_dereg_nbr(nbr, ZEBRA_BFD_DEST_UPDATE); | |
193 | } | |
194 | } | |
195 | } | |
196 | return 0; | |
197 | } | |
198 | ||
199 | /* | |
68fe91d6 | 200 | * ospf_bfd_interface_dest_update - Find the neighbor for which the BFD status |
201 | * has changed and bring down the neighbor | |
202 | * connectivity if the BFD status changed to | |
203 | * down. | |
7f342629 DS |
204 | */ |
205 | static int | |
68fe91d6 | 206 | ospf_bfd_interface_dest_update (int command, struct zclient *zclient, |
7076bb2f | 207 | zebra_size_t length, vrf_id_t vrf_id) |
7f342629 DS |
208 | { |
209 | struct interface *ifp; | |
210 | struct ospf_interface *oi; | |
211 | struct ospf_if_params *params; | |
212 | struct ospf_neighbor *nbr; | |
213 | struct route_node *node; | |
214 | struct prefix p; | |
68fe91d6 | 215 | int status; |
216 | int old_status; | |
217 | struct bfd_info *bfd_info; | |
218 | struct timeval tv; | |
7f342629 | 219 | |
1e22a2af | 220 | ifp = bfd_get_peer_info (zclient->ibuf, &p, NULL, &status, vrf_id); |
7f342629 DS |
221 | |
222 | if ((ifp == NULL) || (p.family != AF_INET)) | |
223 | return 0; | |
224 | ||
225 | if (IS_DEBUG_OSPF (zebra, ZEBRA_INTERFACE)) | |
226 | { | |
4690c7d7 | 227 | char buf[PREFIX2STR_BUFFER]; |
7f342629 | 228 | prefix2str(&p, buf, sizeof(buf)); |
68fe91d6 | 229 | zlog_debug("Zebra: interface %s bfd destination %s %s", ifp->name, buf, |
230 | bfd_get_status_str(status)); | |
7f342629 DS |
231 | } |
232 | ||
233 | params = IF_DEF_PARAMS (ifp); | |
234 | if (!params->bfd_info) | |
235 | return 0; | |
236 | ||
237 | for (node = route_top (IF_OIFS (ifp)); node; node = route_next (node)) | |
238 | { | |
239 | if ((oi = node->info) == NULL) | |
240 | continue; | |
241 | ||
242 | nbr = ospf_nbr_lookup_by_addr (oi->nbrs, &p.u.prefix4); | |
68fe91d6 | 243 | if (!nbr || !nbr->bfd_info) |
244 | continue; | |
245 | ||
246 | bfd_info = (struct bfd_info *)nbr->bfd_info; | |
247 | if (bfd_info->status == status) | |
7f342629 DS |
248 | continue; |
249 | ||
68fe91d6 | 250 | old_status = bfd_info->status; |
251 | bfd_info->status = status; | |
252 | quagga_gettime (QUAGGA_CLK_MONOTONIC, &tv); | |
253 | bfd_info->last_update = tv.tv_sec; | |
254 | ||
255 | if ((status == BFD_STATUS_DOWN) && (old_status == BFD_STATUS_UP)) | |
256 | { | |
257 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) | |
258 | zlog_debug ("NSM[%s:%s]: BFD Down", | |
259 | IF_NAME (nbr->oi), inet_ntoa (nbr->address.u.prefix4)); | |
7f342629 | 260 | |
68fe91d6 | 261 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_InactivityTimer); |
262 | } | |
7f342629 DS |
263 | } |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
68fe91d6 | 268 | /* |
269 | * ospf_bfd_info_nbr_create - Create/update BFD information for a neighbor. | |
270 | */ | |
271 | void | |
272 | ospf_bfd_info_nbr_create (struct ospf_interface *oi, 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 | ||
7f342629 DS |
296 | /* |
297 | * ospf_bfd_write_config - Write the interface BFD configuration. | |
298 | */ | |
299 | void | |
300 | ospf_bfd_write_config(struct vty *vty, struct ospf_if_params *params) | |
301 | ||
302 | { | |
303 | struct bfd_info *bfd_info; | |
304 | ||
305 | if (!params->bfd_info) | |
306 | return; | |
307 | ||
308 | bfd_info = (struct bfd_info *)params->bfd_info; | |
309 | ||
310 | if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG)) | |
311 | vty_out (vty, " ip ospf bfd %d %d %d%s", | |
312 | bfd_info->detect_mult, bfd_info->required_min_rx, | |
313 | bfd_info->desired_min_tx, VTY_NEWLINE); | |
314 | else | |
315 | vty_out (vty, " ip ospf bfd%s", VTY_NEWLINE); | |
316 | } | |
317 | ||
68fe91d6 | 318 | /* |
319 | * ospf_bfd_show_info - Show BFD info structure | |
320 | */ | |
321 | void | |
322 | ospf_bfd_show_info(struct vty *vty, void *bfd_info, json_object *json_obj, | |
323 | u_char use_json, int param_only) | |
324 | { | |
325 | if (param_only) | |
326 | bfd_show_param(vty, (struct bfd_info *)bfd_info, 1, 0, use_json, json_obj); | |
327 | else | |
328 | bfd_show_info(vty, (struct bfd_info *)bfd_info, 0, 1, use_json, json_obj); | |
329 | } | |
330 | ||
331 | /* | |
332 | * ospf_bfd_interface_show - Show the interface BFD configuration. | |
333 | */ | |
334 | void | |
335 | ospf_bfd_interface_show(struct vty *vty, struct interface *ifp, | |
336 | json_object *json_interface_sub, u_char use_json) | |
337 | { | |
338 | struct ospf_if_params *params; | |
339 | ||
340 | params = IF_DEF_PARAMS (ifp); | |
341 | ||
342 | ospf_bfd_show_info(vty, params->bfd_info, json_interface_sub, use_json, 1); | |
343 | } | |
7f342629 DS |
344 | |
345 | /* | |
346 | * ospf_bfd_if_param_set - Set the configured BFD paramter values for | |
347 | * interface. | |
348 | */ | |
349 | static void | |
350 | ospf_bfd_if_param_set (struct interface *ifp, u_int32_t min_rx, | |
351 | u_int32_t min_tx, u_int8_t detect_mult, int defaults) | |
352 | { | |
353 | struct ospf_if_params *params; | |
354 | int command = 0; | |
355 | ||
356 | params = IF_DEF_PARAMS (ifp); | |
357 | ||
68fe91d6 | 358 | bfd_set_param((struct bfd_info **)&(params->bfd_info), min_rx, min_tx, |
359 | detect_mult, defaults, &command); | |
7f342629 DS |
360 | if (command) |
361 | ospf_bfd_reg_dereg_all_nbr(ifp, command); | |
362 | } | |
363 | ||
7f342629 DS |
364 | DEFUN (ip_ospf_bfd, |
365 | ip_ospf_bfd_cmd, | |
366 | "ip ospf bfd", | |
367 | "IP Information\n" | |
368 | "OSPF interface commands\n" | |
369 | "Enables BFD support\n") | |
370 | { | |
371 | struct interface *ifp = (struct interface *) vty->index; | |
372 | ||
373 | assert (ifp); | |
374 | ospf_bfd_if_param_set (ifp, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX, | |
375 | BFD_DEF_DETECT_MULT, 1); | |
376 | ||
377 | return CMD_SUCCESS; | |
378 | } | |
379 | ||
380 | DEFUN (ip_ospf_bfd_param, | |
381 | ip_ospf_bfd_param_cmd, | |
382 | "ip ospf bfd " BFD_CMD_DETECT_MULT_RANGE BFD_CMD_MIN_RX_RANGE BFD_CMD_MIN_TX_RANGE, | |
383 | "IP Information\n" | |
384 | "OSPF interface commands\n" | |
385 | "Enables BFD support\n" | |
386 | "Detect Multiplier\n" | |
387 | "Required min receive interval\n" | |
388 | "Desired min transmit interval\n") | |
389 | { | |
390 | struct interface *ifp = (struct interface *) vty->index; | |
391 | u_int32_t rx_val; | |
392 | u_int32_t tx_val; | |
393 | u_int8_t dm_val; | |
394 | int ret; | |
395 | ||
396 | assert (ifp); | |
397 | ||
398 | if ((ret = bfd_validate_param (vty, argv[0], argv[1], argv[2], &dm_val, | |
399 | &rx_val, &tx_val)) != CMD_SUCCESS) | |
400 | return ret; | |
401 | ||
402 | ospf_bfd_if_param_set (ifp, rx_val, tx_val, dm_val, 0); | |
403 | ||
404 | return CMD_SUCCESS; | |
405 | } | |
406 | ||
407 | DEFUN (no_ip_ospf_bfd, | |
408 | no_ip_ospf_bfd_cmd, | |
409 | "no ip ospf bfd", | |
410 | NO_STR | |
411 | "IP Information\n" | |
412 | "OSPF interface commands\n" | |
413 | "Disables BFD support\n") | |
414 | { | |
415 | struct interface *ifp = (struct interface *)vty->index; | |
416 | struct ospf_if_params *params; | |
417 | ||
418 | assert (ifp); | |
419 | ||
420 | params = IF_DEF_PARAMS (ifp); | |
421 | if (params->bfd_info) | |
422 | { | |
423 | ospf_bfd_reg_dereg_all_nbr(ifp, ZEBRA_BFD_DEST_DEREGISTER); | |
424 | bfd_info_free(&(params->bfd_info)); | |
425 | } | |
426 | ||
427 | return CMD_SUCCESS; | |
428 | } | |
429 | ||
813d4307 DW |
430 | ALIAS (no_ip_ospf_bfd, |
431 | no_ip_ospf_bfd_param_cmd, | |
432 | "no ip ospf bfd " BFD_CMD_DETECT_MULT_RANGE BFD_CMD_MIN_RX_RANGE BFD_CMD_MIN_TX_RANGE, | |
433 | NO_STR | |
434 | "IP Information\n" | |
435 | "OSPF interface commands\n" | |
436 | "Enables BFD support\n" | |
437 | "Detect Multiplier\n" | |
438 | "Required min receive interval\n" | |
439 | "Desired min transmit interval\n") | |
440 | ||
7f342629 DS |
441 | void |
442 | ospf_bfd_init(void) | |
443 | { | |
567b877d | 444 | bfd_gbl_init(); |
445 | ||
7f342629 | 446 | /* Initialize BFD client functions */ |
68fe91d6 | 447 | zclient->interface_bfd_dest_update = ospf_bfd_interface_dest_update; |
7f342629 DS |
448 | zclient->bfd_dest_replay = ospf_bfd_nbr_replay; |
449 | ||
450 | /* Install BFD command */ | |
451 | install_element (INTERFACE_NODE, &ip_ospf_bfd_cmd); | |
452 | install_element (INTERFACE_NODE, &ip_ospf_bfd_param_cmd); | |
453 | install_element (INTERFACE_NODE, &no_ip_ospf_bfd_cmd); | |
813d4307 | 454 | install_element (INTERFACE_NODE, &no_ip_ospf_bfd_param_cmd); |
055c4dfc | 455 | |
456 | /* Send the client registration */ | |
457 | bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER); | |
7f342629 | 458 | } |