Line data Source code
1 : /*
2 : * OSPF Neighbor functions.
3 : * Copyright (C) 1999, 2000 Toshiaki Takada
4 : *
5 : * This file is part of GNU Zebra.
6 : *
7 : * GNU Zebra is free software; you can redistribute it and/or modify
8 : * it under the terms of the GNU General Public License as published
9 : * by the Free Software Foundation; either version 2, or (at your
10 : * option) any later version.
11 : *
12 : * GNU Zebra is distributed in the hope that it will be useful, but
13 : * WITHOUT ANY WARRANTY; without even the implied warranty of
14 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 : * General Public License for more details.
16 : *
17 : * You should have received a copy of the GNU General Public License along
18 : * with this program; see the file COPYING; if not, write to the Free Software
19 : * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 : */
21 :
22 : #include <zebra.h>
23 :
24 : #include "lib/bfd.h"
25 : #include "linklist.h"
26 : #include "prefix.h"
27 : #include "memory.h"
28 : #include "command.h"
29 : #include "thread.h"
30 : #include "stream.h"
31 : #include "table.h"
32 : #include "log.h"
33 : #include "json.h"
34 :
35 : #include "ospfd/ospfd.h"
36 : #include "ospfd/ospf_interface.h"
37 : #include "ospfd/ospf_asbr.h"
38 : #include "ospfd/ospf_lsa.h"
39 : #include "ospfd/ospf_lsdb.h"
40 : #include "ospfd/ospf_neighbor.h"
41 : #include "ospfd/ospf_nsm.h"
42 : #include "ospfd/ospf_packet.h"
43 : #include "ospfd/ospf_network.h"
44 : #include "ospfd/ospf_flood.h"
45 : #include "ospfd/ospf_dump.h"
46 : #include "ospfd/ospf_bfd.h"
47 : #include "ospfd/ospf_gr.h"
48 :
49 : /* Fill in the the 'key' as appropriate to retrieve the entry for nbr
50 : * from the ospf_interface's nbrs table. Indexed by interface address
51 : * for all cases except Virtual-link and PointToPoint interfaces, where
52 : * neighbours are indexed by router-ID instead.
53 : */
54 94 : static void ospf_nbr_key(struct ospf_interface *oi, struct ospf_neighbor *nbr,
55 : struct prefix *key)
56 : {
57 94 : key->family = AF_INET;
58 94 : key->prefixlen = IPV4_MAX_BITLEN;
59 :
60 : /* vlinks are indexed by router-id */
61 94 : if (oi->type == OSPF_IFTYPE_VIRTUALLINK
62 94 : || oi->type == OSPF_IFTYPE_POINTOPOINT)
63 0 : key->u.prefix4 = nbr->router_id;
64 : else
65 94 : key->u.prefix4 = nbr->src;
66 94 : return;
67 : }
68 :
69 51 : struct ospf_neighbor *ospf_nbr_new(struct ospf_interface *oi)
70 : {
71 51 : struct ospf_neighbor *nbr;
72 :
73 : /* Allcate new neighbor. */
74 51 : nbr = XCALLOC(MTYPE_OSPF_NEIGHBOR, sizeof(struct ospf_neighbor));
75 :
76 : /* Relate neighbor to the interface. */
77 51 : nbr->oi = oi;
78 :
79 : /* Set default values. */
80 51 : nbr->state = NSM_Down;
81 :
82 : /* Set inheritance values. */
83 51 : nbr->v_inactivity = OSPF_IF_PARAM(oi, v_wait);
84 51 : nbr->v_db_desc = OSPF_IF_PARAM(oi, retransmit_interval);
85 51 : nbr->v_ls_req = OSPF_IF_PARAM(oi, retransmit_interval);
86 51 : nbr->v_ls_upd = OSPF_IF_PARAM(oi, retransmit_interval);
87 51 : nbr->priority = -1;
88 :
89 : /* DD flags. */
90 51 : nbr->dd_flags = OSPF_DD_FLAG_MS | OSPF_DD_FLAG_M | OSPF_DD_FLAG_I;
91 :
92 : /* Last received and sent DD. */
93 51 : nbr->last_send = NULL;
94 :
95 51 : nbr->nbr_nbma = NULL;
96 :
97 51 : ospf_lsdb_init(&nbr->db_sum);
98 51 : ospf_lsdb_init(&nbr->ls_rxmt);
99 51 : ospf_lsdb_init(&nbr->ls_req);
100 :
101 51 : nbr->crypt_seqnum = 0;
102 :
103 : /* Initialize GR Helper info*/
104 51 : nbr->gr_helper_info.recvd_grace_period = 0;
105 51 : nbr->gr_helper_info.actual_grace_period = 0;
106 51 : nbr->gr_helper_info.gr_helper_status = OSPF_GR_NOT_HELPER;
107 51 : nbr->gr_helper_info.helper_exit_reason = OSPF_GR_HELPER_EXIT_NONE;
108 51 : nbr->gr_helper_info.gr_restart_reason = OSPF_GR_UNKNOWN_RESTART;
109 :
110 51 : return nbr;
111 : }
112 :
113 51 : void ospf_nbr_free(struct ospf_neighbor *nbr)
114 : {
115 : /* Free DB summary list. */
116 51 : if (ospf_db_summary_count(nbr))
117 0 : ospf_db_summary_clear(nbr);
118 : /* ospf_db_summary_delete_all (nbr); */
119 :
120 : /* Free ls request list. */
121 51 : if (ospf_ls_request_count(nbr))
122 0 : ospf_ls_request_delete_all(nbr);
123 :
124 : /* Free retransmit list. */
125 51 : if (ospf_ls_retransmit_count(nbr))
126 0 : ospf_ls_retransmit_clear(nbr);
127 :
128 : /* Cleanup LSDBs. */
129 51 : ospf_lsdb_cleanup(&nbr->db_sum);
130 51 : ospf_lsdb_cleanup(&nbr->ls_req);
131 51 : ospf_lsdb_cleanup(&nbr->ls_rxmt);
132 :
133 : /* Clear last send packet. */
134 51 : if (nbr->last_send)
135 8 : ospf_packet_free(nbr->last_send);
136 :
137 51 : if (nbr->nbr_nbma) {
138 0 : nbr->nbr_nbma->nbr = NULL;
139 0 : nbr->nbr_nbma = NULL;
140 : }
141 :
142 : /* Cancel all timers. */
143 51 : THREAD_OFF(nbr->t_inactivity);
144 51 : THREAD_OFF(nbr->t_db_desc);
145 51 : THREAD_OFF(nbr->t_ls_req);
146 51 : THREAD_OFF(nbr->t_ls_upd);
147 :
148 : /* Cancel all events. */ /* Thread lookup cost would be negligible. */
149 51 : thread_cancel_event(master, nbr);
150 :
151 51 : bfd_sess_free(&nbr->bfd_session);
152 :
153 51 : THREAD_OFF(nbr->gr_helper_info.t_grace_timer);
154 :
155 51 : nbr->oi = NULL;
156 51 : XFREE(MTYPE_OSPF_NEIGHBOR, nbr);
157 51 : }
158 :
159 : /* Delete specified OSPF neighbor from interface. */
160 51 : void ospf_nbr_delete(struct ospf_neighbor *nbr)
161 : {
162 51 : struct ospf_interface *oi;
163 51 : struct route_node *rn;
164 51 : struct prefix p;
165 :
166 51 : oi = nbr->oi;
167 :
168 : /* get appropriate prefix 'key' */
169 51 : ospf_nbr_key(oi, nbr, &p);
170 :
171 51 : rn = route_node_lookup(oi->nbrs, &p);
172 51 : if (rn) {
173 : /* If lookup for a NBR succeeds, the leaf route_node could
174 : * only exist because there is (or was) a nbr there.
175 : * If the nbr was deleted, the leaf route_node should have
176 : * lost its last refcount too, and be deleted.
177 : * Therefore a looked-up leaf route_node in nbrs table
178 : * should never have NULL info.
179 : */
180 51 : assert(rn->info);
181 :
182 51 : if (rn->info) {
183 51 : rn->info = NULL;
184 51 : route_unlock_node(rn);
185 : } else
186 0 : zlog_info("Can't find neighbor %pI4 in the interface %s",
187 : &nbr->src, IF_NAME(oi));
188 :
189 51 : route_unlock_node(rn);
190 : } else {
191 : /*
192 : * This neighbor was not found, but before we move on and
193 : * free the neighbor structre, make sure that it was not
194 : * indexed incorrectly and ended up in the "worng" place
195 : */
196 :
197 : /* Reverse the lookup rules */
198 0 : if (oi->type == OSPF_IFTYPE_VIRTUALLINK
199 0 : || oi->type == OSPF_IFTYPE_POINTOPOINT)
200 0 : p.u.prefix4 = nbr->src;
201 : else
202 0 : p.u.prefix4 = nbr->router_id;
203 :
204 0 : rn = route_node_lookup(oi->nbrs, &p);
205 0 : if (rn) {
206 : /* We found the neighbor!
207 : * Now make sure it is not the exact same neighbor
208 : * structure that we are about to free
209 : */
210 0 : if (nbr == rn->info) {
211 : /* Same neighbor, drop the reference to it */
212 0 : rn->info = NULL;
213 0 : route_unlock_node(rn);
214 : }
215 0 : route_unlock_node(rn);
216 : }
217 : }
218 :
219 : /* Free ospf_neighbor structure. */
220 51 : ospf_nbr_free(nbr);
221 51 : }
222 :
223 : /* Check myself is in the neighbor list. */
224 79 : int ospf_nbr_bidirectional(struct in_addr *router_id, struct in_addr *neighbors,
225 : int size)
226 : {
227 79 : int i;
228 79 : int max;
229 :
230 79 : max = size / sizeof(struct in_addr);
231 :
232 102 : for (i = 0; i < max; i++)
233 98 : if (IPV4_ADDR_SAME(router_id, &neighbors[i]))
234 : return 1;
235 :
236 : return 0;
237 : }
238 :
239 : /* reset nbr_self */
240 43 : void ospf_nbr_self_reset(struct ospf_interface *oi, struct in_addr router_id)
241 : {
242 43 : if (oi->nbr_self)
243 26 : ospf_nbr_delete(oi->nbr_self);
244 :
245 43 : oi->nbr_self = ospf_nbr_new(oi);
246 43 : ospf_nbr_add_self(oi, router_id);
247 43 : }
248 :
249 : /* Add self to nbr list. */
250 43 : void ospf_nbr_add_self(struct ospf_interface *oi, struct in_addr router_id)
251 : {
252 43 : struct prefix p;
253 43 : struct route_node *rn;
254 :
255 43 : if (!oi->nbr_self)
256 0 : oi->nbr_self = ospf_nbr_new(oi);
257 :
258 : /* Initial state */
259 43 : oi->nbr_self->address = *oi->address;
260 43 : oi->nbr_self->priority = OSPF_IF_PARAM(oi, priority);
261 43 : oi->nbr_self->router_id = router_id;
262 43 : oi->nbr_self->src = oi->address->u.prefix4;
263 43 : oi->nbr_self->state = NSM_TwoWay;
264 :
265 43 : switch (oi->area->external_routing) {
266 43 : case OSPF_AREA_DEFAULT:
267 43 : SET_FLAG(oi->nbr_self->options, OSPF_OPTION_E);
268 43 : break;
269 0 : case OSPF_AREA_STUB:
270 0 : UNSET_FLAG(oi->nbr_self->options, OSPF_OPTION_E);
271 0 : break;
272 0 : case OSPF_AREA_NSSA:
273 0 : UNSET_FLAG(oi->nbr_self->options, OSPF_OPTION_E);
274 0 : SET_FLAG(oi->nbr_self->options, OSPF_OPTION_NP);
275 0 : break;
276 : }
277 :
278 : /* Add nbr_self to nbrs table */
279 43 : ospf_nbr_key(oi, oi->nbr_self, &p);
280 :
281 43 : rn = route_node_get(oi->nbrs, &p);
282 43 : if (rn->info) {
283 : /* There is already pseudo neighbor. */
284 0 : if (IS_DEBUG_OSPF_EVENT)
285 0 : zlog_debug(
286 : "router_id %pI4 already present in neighbor table. node refcount %u",
287 : &router_id, route_node_get_lock_count(rn));
288 0 : route_unlock_node(rn);
289 : } else
290 43 : rn->info = oi->nbr_self;
291 43 : }
292 :
293 : /* Get neighbor count by status.
294 : Specify status = 0, get all neighbor other than myself. */
295 52 : int ospf_nbr_count(struct ospf_interface *oi, int state)
296 : {
297 52 : struct ospf_neighbor *nbr;
298 52 : struct route_node *rn;
299 52 : int count = 0;
300 :
301 182 : for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
302 130 : if ((nbr = rn->info))
303 91 : if (!IPV4_ADDR_SAME(&nbr->router_id,
304 : &oi->ospf->router_id))
305 39 : if (state == 0 || nbr->state == state)
306 24 : count++;
307 :
308 52 : return count;
309 : }
310 :
311 0 : int ospf_nbr_count_opaque_capable(struct ospf_interface *oi)
312 : {
313 0 : struct ospf_neighbor *nbr;
314 0 : struct route_node *rn;
315 0 : int count = 0;
316 :
317 0 : for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
318 0 : if ((nbr = rn->info))
319 0 : if (!IPV4_ADDR_SAME(&nbr->router_id,
320 : &oi->ospf->router_id))
321 0 : if (nbr->state == NSM_Full)
322 0 : if (CHECK_FLAG(nbr->options,
323 : OSPF_OPTION_O))
324 0 : count++;
325 :
326 0 : return count;
327 : }
328 :
329 : /* lookup nbr by address - use this only if you know you must
330 : * otherwise use the ospf_nbr_lookup() wrapper, which deals
331 : * with virtual link and PointToPoint neighbours
332 : */
333 165 : struct ospf_neighbor *ospf_nbr_lookup_by_addr(struct route_table *nbrs,
334 : struct in_addr *addr)
335 : {
336 165 : struct prefix p;
337 165 : struct route_node *rn;
338 165 : struct ospf_neighbor *nbr;
339 :
340 165 : p.family = AF_INET;
341 165 : p.prefixlen = IPV4_MAX_BITLEN;
342 165 : p.u.prefix4 = *addr;
343 :
344 165 : rn = route_node_lookup(nbrs, &p);
345 165 : if (!rn)
346 : return NULL;
347 :
348 : /* See comment in ospf_nbr_delete */
349 165 : assert(rn->info);
350 :
351 165 : if (rn->info == NULL) {
352 0 : route_unlock_node(rn);
353 0 : return NULL;
354 : }
355 :
356 165 : nbr = (struct ospf_neighbor *)rn->info;
357 165 : route_unlock_node(rn);
358 :
359 165 : return nbr;
360 : }
361 :
362 0 : struct ospf_neighbor *ospf_nbr_lookup_by_routerid(struct route_table *nbrs,
363 : struct in_addr *id)
364 : {
365 0 : struct route_node *rn;
366 0 : struct ospf_neighbor *nbr;
367 :
368 0 : for (rn = route_top(nbrs); rn; rn = route_next(rn))
369 0 : if ((nbr = rn->info) != NULL)
370 0 : if (IPV4_ADDR_SAME(&nbr->router_id, id)) {
371 0 : route_unlock_node(rn);
372 0 : return nbr;
373 : }
374 :
375 : return NULL;
376 : }
377 :
378 0 : void ospf_renegotiate_optional_capabilities(struct ospf *top)
379 : {
380 0 : struct listnode *node;
381 0 : struct ospf_interface *oi;
382 0 : struct route_table *nbrs;
383 0 : struct route_node *rn;
384 0 : struct ospf_neighbor *nbr;
385 0 : uint8_t shutdown_save = top->inst_shutdown;
386 :
387 : /* At first, flush self-originated LSAs from routing domain. */
388 0 : ospf_flush_self_originated_lsas_now(top);
389 :
390 : /* ospf_flush_self_originated_lsas_now is primarily intended for shut
391 : * down scenarios. Reset the inst_shutdown flag that it sets. We are
392 : * just changing configuration, and the flag can change the scheduling
393 : * of when maxage LSAs are sent. */
394 0 : top->inst_shutdown = shutdown_save;
395 :
396 : /* Revert all neighbor status to ExStart. */
397 0 : for (ALL_LIST_ELEMENTS_RO(top->oiflist, node, oi)) {
398 0 : if ((nbrs = oi->nbrs) == NULL)
399 0 : continue;
400 :
401 0 : for (rn = route_top(nbrs); rn; rn = route_next(rn)) {
402 0 : if ((nbr = rn->info) == NULL || nbr == oi->nbr_self)
403 0 : continue;
404 :
405 0 : if (nbr->state < NSM_ExStart)
406 0 : continue;
407 :
408 0 : if (IS_DEBUG_OSPF_EVENT)
409 0 : zlog_debug(
410 : "Renegotiate optional capabilities with neighbor(%pI4)",
411 : &nbr->router_id);
412 :
413 0 : OSPF_NSM_EVENT_SCHEDULE(nbr, NSM_SeqNumberMismatch);
414 : }
415 : }
416 :
417 : /* Refresh/Re-originate external LSAs (Type-7 and Type-5).*/
418 0 : ospf_external_lsa_rid_change(top);
419 :
420 0 : return;
421 : }
422 :
423 :
424 108 : struct ospf_neighbor *ospf_nbr_lookup(struct ospf_interface *oi, struct ip *iph,
425 : struct ospf_header *ospfh)
426 : {
427 108 : struct in_addr srcaddr = iph->ip_src;
428 :
429 108 : if (oi->type == OSPF_IFTYPE_VIRTUALLINK
430 108 : || oi->type == OSPF_IFTYPE_POINTOPOINT)
431 0 : return (ospf_nbr_lookup_by_routerid(oi->nbrs,
432 : &ospfh->router_id));
433 : else
434 108 : return (ospf_nbr_lookup_by_addr(oi->nbrs, &srcaddr));
435 : }
436 :
437 8 : static struct ospf_neighbor *ospf_nbr_add(struct ospf_interface *oi,
438 : struct ospf_header *ospfh,
439 : struct prefix *p)
440 : {
441 8 : struct ospf_neighbor *nbr;
442 :
443 8 : nbr = ospf_nbr_new(oi);
444 8 : nbr->state = NSM_Down;
445 8 : nbr->src = p->u.prefix4;
446 8 : memcpy(&nbr->address, p, sizeof(struct prefix));
447 :
448 8 : nbr->nbr_nbma = NULL;
449 8 : if (oi->type == OSPF_IFTYPE_NBMA) {
450 0 : struct ospf_nbr_nbma *nbr_nbma;
451 0 : struct listnode *node;
452 :
453 0 : for (ALL_LIST_ELEMENTS_RO(oi->nbr_nbma, node, nbr_nbma)) {
454 0 : if (IPV4_ADDR_SAME(&nbr_nbma->addr, &nbr->src)) {
455 0 : nbr_nbma->nbr = nbr;
456 0 : nbr->nbr_nbma = nbr_nbma;
457 :
458 0 : if (nbr_nbma->t_poll)
459 0 : THREAD_OFF(nbr_nbma->t_poll);
460 :
461 0 : nbr->state_change = nbr_nbma->state_change + 1;
462 : }
463 : }
464 : }
465 :
466 : /* New nbr, save the crypto sequence number if necessary */
467 8 : if (ntohs(ospfh->auth_type) == OSPF_AUTH_CRYPTOGRAPHIC)
468 0 : nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum;
469 :
470 : /* Configure BFD if interface has it. */
471 8 : ospf_neighbor_bfd_apply(nbr);
472 :
473 8 : if (IS_DEBUG_OSPF_EVENT)
474 8 : zlog_debug("NSM[%s:%pI4]: start", IF_NAME(oi),
475 : &nbr->router_id);
476 :
477 8 : return nbr;
478 : }
479 :
480 79 : struct ospf_neighbor *ospf_nbr_get(struct ospf_interface *oi,
481 : struct ospf_header *ospfh, struct ip *iph,
482 : struct prefix *p)
483 : {
484 79 : struct route_node *rn;
485 79 : struct prefix key;
486 79 : struct ospf_neighbor *nbr;
487 :
488 79 : key.family = AF_INET;
489 79 : key.prefixlen = IPV4_MAX_BITLEN;
490 :
491 79 : if (oi->type == OSPF_IFTYPE_VIRTUALLINK
492 79 : || oi->type == OSPF_IFTYPE_POINTOPOINT)
493 0 : key.u.prefix4 = ospfh->router_id; /* index vlink and ptp nbrs by
494 : router-id */
495 : else
496 79 : key.u.prefix4 = iph->ip_src;
497 :
498 79 : rn = route_node_get(oi->nbrs, &key);
499 79 : if (rn->info) {
500 71 : route_unlock_node(rn);
501 71 : nbr = rn->info;
502 :
503 71 : if (oi->type == OSPF_IFTYPE_NBMA && nbr->state == NSM_Attempt) {
504 0 : nbr->src = iph->ip_src;
505 0 : memcpy(&nbr->address, p, sizeof(struct prefix));
506 : }
507 : } else {
508 8 : rn->info = nbr = ospf_nbr_add(oi, ospfh, p);
509 : }
510 :
511 79 : nbr->router_id = ospfh->router_id;
512 :
513 79 : return nbr;
514 : }
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