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7f342629 DS |
1 | /** |
2 | * ospf6_bfd.c: IPv6 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 "if.h" | |
37 | #include "ospf6d.h" | |
38 | #include "ospf6_message.h" | |
39 | #include "ospf6_neighbor.h" | |
40 | #include "ospf6_interface.h" | |
41 | #include "ospf6_route.h" | |
42 | #include "ospf6_zebra.h" | |
43 | #include "ospf6_bfd.h" | |
44 | ||
45 | extern struct zclient *zclient; | |
46 | ||
68fe91d6 | 47 | /* |
48 | * ospf6_bfd_info_free - Free BFD info structure | |
49 | */ | |
d62a17ae | 50 | void ospf6_bfd_info_free(void **bfd_info) |
68fe91d6 | 51 | { |
d62a17ae | 52 | bfd_info_free((struct bfd_info **)bfd_info); |
68fe91d6 | 53 | } |
54 | ||
55 | /* | |
56 | * ospf6_bfd_show_info - Show BFD info structure | |
57 | */ | |
d62a17ae | 58 | void ospf6_bfd_show_info(struct vty *vty, void *bfd_info, int param_only) |
68fe91d6 | 59 | { |
d62a17ae | 60 | if (param_only) |
61 | bfd_show_param(vty, bfd_info, 1, 0, 0, NULL); | |
62 | else | |
63 | bfd_show_info(vty, bfd_info, 0, 1, 0, NULL); | |
68fe91d6 | 64 | } |
65 | ||
7f342629 DS |
66 | /* |
67 | * ospf6_bfd_reg_dereg_nbr - Register/Deregister a neighbor with BFD through | |
68 | * zebra for starting/stopping the monitoring of | |
69 | * the neighbor rechahability. | |
70 | */ | |
d62a17ae | 71 | void ospf6_bfd_reg_dereg_nbr(struct ospf6_neighbor *on, int command) |
7f342629 | 72 | { |
d62a17ae | 73 | struct ospf6_interface *oi = on->ospf6_if; |
74 | struct interface *ifp = oi->interface; | |
75 | struct bfd_info *bfd_info; | |
76 | char src[64]; | |
77 | ||
78 | if (!oi->bfd_info || !on->bfd_info) | |
79 | return; | |
80 | bfd_info = (struct bfd_info *)oi->bfd_info; | |
81 | ||
82 | if (IS_OSPF6_DEBUG_ZEBRA(SEND)) { | |
83 | inet_ntop(AF_INET6, &on->linklocal_addr, src, sizeof(src)); | |
84 | zlog_debug("%s nbr (%s) with BFD", | |
85 | bfd_get_command_dbg_str(command), src); | |
86 | } | |
87 | ||
88 | bfd_peer_sendmsg(zclient, bfd_info, AF_INET6, &on->linklocal_addr, | |
89 | on->ospf6_if->linklocal_addr, ifp->name, 0, 0, command, | |
90 | 0, VRF_DEFAULT); | |
91 | ||
92 | if (command == ZEBRA_BFD_DEST_DEREGISTER) | |
93 | bfd_info_free((struct bfd_info **)&on->bfd_info); | |
7f342629 DS |
94 | } |
95 | ||
96 | /* | |
97 | * ospf6_bfd_trigger_event - Neighbor is registered/deregistered with BFD when | |
98 | * neighbor state is changed to/from 2way. | |
99 | */ | |
d62a17ae | 100 | void ospf6_bfd_trigger_event(struct ospf6_neighbor *on, int old_state, |
101 | int state) | |
7f342629 | 102 | { |
d62a17ae | 103 | if ((old_state < OSPF6_NEIGHBOR_TWOWAY) |
104 | && (state >= OSPF6_NEIGHBOR_TWOWAY)) | |
105 | ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_REGISTER); | |
106 | else if ((old_state >= OSPF6_NEIGHBOR_TWOWAY) | |
107 | && (state < OSPF6_NEIGHBOR_TWOWAY)) | |
108 | ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_DEREGISTER); | |
7f342629 DS |
109 | } |
110 | ||
111 | /* | |
112 | * ospf6_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated | |
113 | * with a interface with BFD through | |
114 | * zebra for starting/stopping the monitoring of | |
115 | * the neighbor rechahability. | |
116 | */ | |
d62a17ae | 117 | static void ospf6_bfd_reg_dereg_all_nbr(struct ospf6_interface *oi, int command) |
7f342629 | 118 | { |
d62a17ae | 119 | struct ospf6_neighbor *on; |
120 | struct listnode *node; | |
121 | ||
122 | for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) { | |
123 | if (command == ZEBRA_BFD_DEST_REGISTER) | |
124 | ospf6_bfd_info_nbr_create(oi, on); | |
125 | ||
126 | if (on->state < OSPF6_NEIGHBOR_TWOWAY) { | |
127 | if (command == ZEBRA_BFD_DEST_DEREGISTER) | |
128 | bfd_info_free( | |
129 | (struct bfd_info **)&on->bfd_info); | |
130 | continue; | |
131 | } | |
132 | ||
133 | ospf6_bfd_reg_dereg_nbr(on, command); | |
134 | } | |
7f342629 DS |
135 | } |
136 | ||
137 | /* | |
138 | * ospf6_bfd_nbr_replay - Replay all the neighbors that have BFD enabled | |
139 | * to zebra | |
140 | */ | |
d62a17ae | 141 | static int ospf6_bfd_nbr_replay(int command, struct zclient *zclient, |
142 | zebra_size_t length, vrf_id_t vrf_id) | |
7f342629 | 143 | { |
d62a17ae | 144 | struct listnode *inode, *nnode; |
145 | struct interface *ifp; | |
146 | struct ospf6_interface *oi; | |
147 | struct ospf6_neighbor *on; | |
148 | char dst[64]; | |
149 | ||
150 | if (IS_OSPF6_DEBUG_ZEBRA(RECV)) | |
151 | zlog_debug("Zebra: BFD Dest replay request"); | |
152 | ||
153 | /* Send the client registration */ | |
154 | bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER); | |
155 | ||
156 | /* Replay the neighbor, if BFD is enabled on the interface*/ | |
157 | for (ALL_LIST_ELEMENTS_RO(vrf_iflist(VRF_DEFAULT), inode, ifp)) { | |
158 | oi = (struct ospf6_interface *)ifp->info; | |
159 | ||
160 | if (!oi || !oi->bfd_info) | |
161 | continue; | |
162 | ||
163 | for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, nnode, on)) { | |
164 | if (on->state < OSPF6_NEIGHBOR_TWOWAY) | |
165 | continue; | |
166 | ||
167 | if (IS_OSPF6_DEBUG_ZEBRA(SEND)) { | |
168 | inet_ntop(AF_INET6, &on->linklocal_addr, dst, | |
169 | sizeof(dst)); | |
170 | zlog_debug("Replaying nbr (%s) to BFD", dst); | |
171 | } | |
172 | ||
173 | ospf6_bfd_reg_dereg_nbr(on, ZEBRA_BFD_DEST_UPDATE); | |
174 | } | |
175 | } | |
176 | return 0; | |
7f342629 DS |
177 | } |
178 | ||
179 | /* | |
68fe91d6 | 180 | * ospf6_bfd_interface_dest_update - Find the neighbor for which the BFD status |
181 | * has changed and bring down the neighbor | |
182 | * connectivity if BFD down is received. | |
7f342629 | 183 | */ |
d62a17ae | 184 | static int ospf6_bfd_interface_dest_update(int command, struct zclient *zclient, |
185 | zebra_size_t length, vrf_id_t vrf_id) | |
7f342629 | 186 | { |
d62a17ae | 187 | struct interface *ifp; |
188 | struct ospf6_interface *oi; | |
189 | struct ospf6_neighbor *on; | |
190 | struct prefix dp; | |
191 | struct prefix sp; | |
192 | struct listnode *node, *nnode; | |
193 | char dst[64]; | |
194 | int status; | |
195 | int old_status; | |
196 | struct bfd_info *bfd_info; | |
197 | struct timeval tv; | |
198 | ||
199 | ifp = bfd_get_peer_info(zclient->ibuf, &dp, &sp, &status, vrf_id); | |
200 | ||
201 | if ((ifp == NULL) || (dp.family != AF_INET6)) | |
202 | return 0; | |
203 | ||
204 | if (IS_OSPF6_DEBUG_ZEBRA(RECV)) { | |
205 | char buf[PREFIX2STR_BUFFER]; | |
206 | prefix2str(&dp, buf, sizeof(buf)); | |
207 | zlog_debug("Zebra: interface %s bfd destination %s %s", | |
208 | ifp->name, buf, bfd_get_status_str(status)); | |
209 | } | |
210 | ||
211 | ||
212 | oi = (struct ospf6_interface *)ifp->info; | |
213 | if (!oi || !oi->bfd_info) | |
214 | return 0; | |
215 | ||
216 | for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) { | |
217 | if (memcmp(&(on->linklocal_addr), &dp.u.prefix6, | |
218 | sizeof(struct in6_addr))) | |
219 | continue; | |
220 | ||
221 | if (IS_OSPF6_DEBUG_NEIGHBOR(EVENT)) { | |
222 | inet_ntop(AF_INET6, &on->linklocal_addr, dst, | |
223 | sizeof(dst)); | |
224 | zlog_debug("[%s:%s]: BFD %s", ifp->name, dst, | |
225 | bfd_get_status_str(status)); | |
226 | } | |
227 | ||
228 | if (!on->bfd_info) | |
229 | continue; | |
230 | ||
231 | bfd_info = (struct bfd_info *)on->bfd_info; | |
232 | if (bfd_info->status == status) | |
233 | continue; | |
234 | ||
235 | old_status = bfd_info->status; | |
236 | bfd_info->status = status; | |
237 | monotime(&tv); | |
238 | bfd_info->last_update = tv.tv_sec; | |
239 | ||
240 | if ((status == BFD_STATUS_DOWN) | |
241 | && (old_status == BFD_STATUS_UP)) { | |
242 | THREAD_OFF(on->inactivity_timer); | |
243 | thread_add_event(master, inactivity_timer, on, 0, NULL); | |
244 | } | |
245 | } | |
246 | ||
247 | return 0; | |
7f342629 DS |
248 | } |
249 | ||
68fe91d6 | 250 | /* |
251 | * ospf6_bfd_info_nbr_create - Create/update BFD information for a neighbor. | |
252 | */ | |
d62a17ae | 253 | void ospf6_bfd_info_nbr_create(struct ospf6_interface *oi, |
254 | struct ospf6_neighbor *on) | |
68fe91d6 | 255 | { |
d62a17ae | 256 | struct bfd_info *oi_bfd_info; |
257 | struct bfd_info *on_bfd_info; | |
68fe91d6 | 258 | |
d62a17ae | 259 | if (!oi->bfd_info) |
260 | return; | |
68fe91d6 | 261 | |
d62a17ae | 262 | oi_bfd_info = (struct bfd_info *)oi->bfd_info; |
68fe91d6 | 263 | |
d62a17ae | 264 | if (!on->bfd_info) |
265 | on->bfd_info = bfd_info_create(); | |
68fe91d6 | 266 | |
d62a17ae | 267 | on_bfd_info = (struct bfd_info *)on->bfd_info; |
268 | on_bfd_info->detect_mult = oi_bfd_info->detect_mult; | |
269 | on_bfd_info->desired_min_tx = oi_bfd_info->desired_min_tx; | |
270 | on_bfd_info->required_min_rx = oi_bfd_info->required_min_rx; | |
68fe91d6 | 271 | } |
272 | ||
7f342629 DS |
273 | /* |
274 | * ospf6_bfd_write_config - Write the interface BFD configuration. | |
275 | */ | |
d62a17ae | 276 | void ospf6_bfd_write_config(struct vty *vty, struct ospf6_interface *oi) |
7f342629 | 277 | { |
d62a17ae | 278 | struct bfd_info *bfd_info; |
7f342629 | 279 | |
d62a17ae | 280 | if (!oi->bfd_info) |
281 | return; | |
7f342629 | 282 | |
d62a17ae | 283 | bfd_info = (struct bfd_info *)oi->bfd_info; |
7f342629 | 284 | |
d62a17ae | 285 | if (CHECK_FLAG(bfd_info->flags, BFD_FLAG_PARAM_CFG)) |
286 | vty_out(vty, " ipv6 ospf6 bfd %d %d %d\n", | |
287 | bfd_info->detect_mult, bfd_info->required_min_rx, | |
288 | bfd_info->desired_min_tx); | |
289 | else | |
290 | vty_out(vty, " ipv6 ospf6 bfd\n"); | |
7f342629 DS |
291 | } |
292 | ||
293 | /* | |
294 | * ospf6_bfd_if_param_set - Set the configured BFD paramter values for | |
295 | * interface. | |
296 | */ | |
d62a17ae | 297 | static void ospf6_bfd_if_param_set(struct ospf6_interface *oi, u_int32_t min_rx, |
298 | u_int32_t min_tx, u_int8_t detect_mult, | |
299 | int defaults) | |
7f342629 | 300 | { |
d62a17ae | 301 | int command = 0; |
7f342629 | 302 | |
d62a17ae | 303 | bfd_set_param((struct bfd_info **)&(oi->bfd_info), min_rx, min_tx, |
304 | detect_mult, defaults, &command); | |
305 | if (command) | |
306 | ospf6_bfd_reg_dereg_all_nbr(oi, command); | |
7f342629 DS |
307 | } |
308 | ||
309 | DEFUN (ipv6_ospf6_bfd, | |
310 | ipv6_ospf6_bfd_cmd, | |
311 | "ipv6 ospf6 bfd", | |
312 | IP6_STR | |
313 | OSPF6_STR | |
314 | "Enables BFD support\n" | |
315 | ) | |
316 | { | |
d62a17ae | 317 | VTY_DECLVAR_CONTEXT(interface, ifp); |
318 | struct ospf6_interface *oi; | |
319 | assert(ifp); | |
320 | ||
321 | oi = (struct ospf6_interface *)ifp->info; | |
322 | if (oi == NULL) | |
323 | oi = ospf6_interface_create(ifp); | |
324 | assert(oi); | |
325 | ||
326 | ospf6_bfd_if_param_set(oi, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX, | |
327 | BFD_DEF_DETECT_MULT, 1); | |
328 | return CMD_SUCCESS; | |
7f342629 DS |
329 | } |
330 | ||
331 | DEFUN (ipv6_ospf6_bfd_param, | |
332 | ipv6_ospf6_bfd_param_cmd, | |
9ccf14f7 | 333 | "ipv6 ospf6 bfd (2-255) (50-60000) (50-60000)", |
7f342629 DS |
334 | IP6_STR |
335 | OSPF6_STR | |
336 | "Enables BFD support\n" | |
337 | "Detect Multiplier\n" | |
338 | "Required min receive interval\n" | |
339 | "Desired min transmit interval\n") | |
340 | { | |
d62a17ae | 341 | VTY_DECLVAR_CONTEXT(interface, ifp); |
342 | int idx_number = 3; | |
343 | int idx_number_2 = 4; | |
344 | int idx_number_3 = 5; | |
345 | struct ospf6_interface *oi; | |
346 | u_int32_t rx_val; | |
347 | u_int32_t tx_val; | |
348 | u_int8_t dm_val; | |
349 | int ret; | |
350 | ||
351 | assert(ifp); | |
352 | ||
353 | oi = (struct ospf6_interface *)ifp->info; | |
354 | if (oi == NULL) | |
355 | oi = ospf6_interface_create(ifp); | |
356 | assert(oi); | |
357 | ||
358 | if ((ret = bfd_validate_param( | |
359 | vty, argv[idx_number]->arg, argv[idx_number_2]->arg, | |
360 | argv[idx_number_3]->arg, &dm_val, &rx_val, &tx_val)) | |
361 | != CMD_SUCCESS) | |
362 | return ret; | |
363 | ||
364 | ospf6_bfd_if_param_set(oi, rx_val, tx_val, dm_val, 0); | |
365 | ||
366 | return CMD_SUCCESS; | |
7f342629 DS |
367 | } |
368 | ||
369 | DEFUN (no_ipv6_ospf6_bfd, | |
370 | no_ipv6_ospf6_bfd_cmd, | |
371 | "no ipv6 ospf6 bfd", | |
372 | NO_STR | |
373 | IP6_STR | |
374 | OSPF6_STR | |
375 | "Disables BFD support\n" | |
376 | ) | |
377 | { | |
d62a17ae | 378 | VTY_DECLVAR_CONTEXT(interface, ifp); |
379 | struct ospf6_interface *oi; | |
380 | assert(ifp); | |
381 | ||
382 | oi = (struct ospf6_interface *)ifp->info; | |
383 | if (oi == NULL) | |
384 | oi = ospf6_interface_create(ifp); | |
385 | assert(oi); | |
386 | ||
387 | if (oi->bfd_info) { | |
388 | ospf6_bfd_reg_dereg_all_nbr(oi, ZEBRA_BFD_DEST_DEREGISTER); | |
389 | bfd_info_free((struct bfd_info **)&(oi->bfd_info)); | |
390 | } | |
391 | ||
392 | return CMD_SUCCESS; | |
7f342629 DS |
393 | } |
394 | ||
d62a17ae | 395 | void ospf6_bfd_init(void) |
7f342629 | 396 | { |
d62a17ae | 397 | bfd_gbl_init(); |
567b877d | 398 | |
d62a17ae | 399 | /* Initialize BFD client functions */ |
400 | zclient->interface_bfd_dest_update = ospf6_bfd_interface_dest_update; | |
401 | zclient->bfd_dest_replay = ospf6_bfd_nbr_replay; | |
7f342629 | 402 | |
d62a17ae | 403 | /* Install BFD command */ |
404 | install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_cmd); | |
405 | install_element(INTERFACE_NODE, &ipv6_ospf6_bfd_param_cmd); | |
406 | install_element(INTERFACE_NODE, &no_ipv6_ospf6_bfd_cmd); | |
7f342629 | 407 | } |