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[mirror_frr.git] / ospfd / ospf_abr.c
1 /*
2 * OSPF ABR functions.
3 * Copyright (C) 1999, 2000 Alex Zinin, 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 it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2, or (at your option) any
10 * 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
23 #include <zebra.h>
24
25 #include "thread.h"
26 #include "memory.h"
27 #include "linklist.h"
28 #include "prefix.h"
29 #include "if.h"
30 #include "table.h"
31 #include "vty.h"
32 #include "filter.h"
33 #include "plist.h"
34 #include "log.h"
35
36 #include "ospfd/ospfd.h"
37 #include "ospfd/ospf_interface.h"
38 #include "ospfd/ospf_ism.h"
39 #include "ospfd/ospf_asbr.h"
40 #include "ospfd/ospf_lsa.h"
41 #include "ospfd/ospf_lsdb.h"
42 #include "ospfd/ospf_neighbor.h"
43 #include "ospfd/ospf_nsm.h"
44 #include "ospfd/ospf_spf.h"
45 #include "ospfd/ospf_route.h"
46 #include "ospfd/ospf_ia.h"
47 #include "ospfd/ospf_flood.h"
48 #include "ospfd/ospf_abr.h"
49 #include "ospfd/ospf_ase.h"
50 #include "ospfd/ospf_zebra.h"
51 #include "ospfd/ospf_dump.h"
52 #include "ospfd/ospf_errors.h"
53
54 static struct ospf_area_range *ospf_area_range_new(struct prefix_ipv4 *p)
55 {
56 struct ospf_area_range *range;
57
58 range = XCALLOC(MTYPE_OSPF_AREA_RANGE, sizeof(struct ospf_area_range));
59 range->addr = p->prefix;
60 range->masklen = p->prefixlen;
61 range->cost_config = OSPF_AREA_RANGE_COST_UNSPEC;
62
63 return range;
64 }
65
66 static void ospf_area_range_free(struct ospf_area_range *range)
67 {
68 XFREE(MTYPE_OSPF_AREA_RANGE, range);
69 }
70
71 static void ospf_area_range_add(struct ospf_area *area,
72 struct ospf_area_range *range)
73 {
74 struct route_node *rn;
75 struct prefix_ipv4 p;
76
77 p.family = AF_INET;
78 p.prefixlen = range->masklen;
79 p.prefix = range->addr;
80 apply_mask_ipv4(&p);
81
82 rn = route_node_get(area->ranges, (struct prefix *)&p);
83 if (rn->info)
84 route_unlock_node(rn);
85 else
86 rn->info = range;
87 }
88
89 static void ospf_area_range_delete(struct ospf_area *area,
90 struct route_node *rn)
91 {
92 struct ospf_area_range *range = rn->info;
93
94 if (range->specifics != 0)
95 ospf_delete_discard_route(area->ospf, area->ospf->new_table,
96 (struct prefix_ipv4 *)&rn->p);
97
98 ospf_area_range_free(range);
99 rn->info = NULL;
100 route_unlock_node(rn);
101 route_unlock_node(rn);
102 }
103
104 struct ospf_area_range *ospf_area_range_lookup(struct ospf_area *area,
105 struct prefix_ipv4 *p)
106 {
107 struct route_node *rn;
108
109 rn = route_node_lookup(area->ranges, (struct prefix *)p);
110 if (rn) {
111 route_unlock_node(rn);
112 return rn->info;
113 }
114 return NULL;
115 }
116
117 struct ospf_area_range *ospf_area_range_lookup_next(struct ospf_area *area,
118 struct in_addr *range_net,
119 int first)
120 {
121 struct route_node *rn;
122 struct prefix_ipv4 p;
123 struct ospf_area_range *find;
124
125 p.family = AF_INET;
126 p.prefixlen = IPV4_MAX_BITLEN;
127 p.prefix = *range_net;
128 apply_mask_ipv4(&p);
129
130 if (first)
131 rn = route_top(area->ranges);
132 else {
133 rn = route_node_get(area->ranges, (struct prefix *)&p);
134 rn = route_next(rn);
135 }
136
137 for (; rn; rn = route_next(rn))
138 if (rn->info)
139 break;
140
141 if (rn && rn->info) {
142 find = rn->info;
143 *range_net = rn->p.u.prefix4;
144 route_unlock_node(rn);
145 return find;
146 }
147 return NULL;
148 }
149
150 static struct ospf_area_range *ospf_area_range_match(struct ospf_area *area,
151 struct prefix_ipv4 *p)
152 {
153 struct route_node *node;
154
155 node = route_node_match(area->ranges, (struct prefix *)p);
156 if (node) {
157 route_unlock_node(node);
158 return node->info;
159 }
160 return NULL;
161 }
162
163 struct ospf_area_range *ospf_area_range_match_any(struct ospf *ospf,
164 struct prefix_ipv4 *p)
165 {
166 struct ospf_area_range *range;
167 struct ospf_area *area;
168 struct listnode *node;
169
170 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area))
171 if ((range = ospf_area_range_match(area, p)))
172 return range;
173
174 return NULL;
175 }
176
177 int ospf_area_range_active(struct ospf_area_range *range)
178 {
179 return range->specifics;
180 }
181
182 static int ospf_area_actively_attached(struct ospf_area *area)
183 {
184 return area->act_ints;
185 }
186
187 int ospf_area_range_set(struct ospf *ospf, struct in_addr area_id,
188 struct prefix_ipv4 *p, int advertise)
189 {
190 struct ospf_area *area;
191 struct ospf_area_range *range;
192
193 area = ospf_area_get(ospf, area_id);
194 if (area == NULL)
195 return 0;
196
197 range = ospf_area_range_lookup(area, p);
198 if (range != NULL) {
199 if (!CHECK_FLAG(advertise, OSPF_AREA_RANGE_ADVERTISE))
200 range->cost_config = OSPF_AREA_RANGE_COST_UNSPEC;
201 if ((CHECK_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE)
202 && !CHECK_FLAG(advertise, OSPF_AREA_RANGE_ADVERTISE))
203 || (!CHECK_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE)
204 && CHECK_FLAG(advertise, OSPF_AREA_RANGE_ADVERTISE)))
205 ospf_schedule_abr_task(ospf);
206 } else {
207 range = ospf_area_range_new(p);
208 ospf_area_range_add(area, range);
209 ospf_schedule_abr_task(ospf);
210 }
211
212 if (CHECK_FLAG(advertise, OSPF_AREA_RANGE_ADVERTISE))
213 SET_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE);
214 else {
215 UNSET_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE);
216 range->cost_config = OSPF_AREA_RANGE_COST_UNSPEC;
217 }
218
219 return 1;
220 }
221
222 int ospf_area_range_cost_set(struct ospf *ospf, struct in_addr area_id,
223 struct prefix_ipv4 *p, uint32_t cost)
224 {
225 struct ospf_area *area;
226 struct ospf_area_range *range;
227
228 area = ospf_area_get(ospf, area_id);
229 if (area == NULL)
230 return 0;
231
232 range = ospf_area_range_lookup(area, p);
233 if (range == NULL)
234 return 0;
235
236 if (range->cost_config != cost) {
237 range->cost_config = cost;
238 if (ospf_area_range_active(range))
239 ospf_schedule_abr_task(ospf);
240 }
241
242 return 1;
243 }
244
245 int ospf_area_range_unset(struct ospf *ospf, struct in_addr area_id,
246 struct prefix_ipv4 *p)
247 {
248 struct ospf_area *area;
249 struct route_node *rn;
250
251 area = ospf_area_lookup_by_area_id(ospf, area_id);
252 if (area == NULL)
253 return 0;
254
255 rn = route_node_lookup(area->ranges, (struct prefix *)p);
256 if (rn == NULL)
257 return 0;
258
259 if (ospf_area_range_active(rn->info))
260 ospf_schedule_abr_task(ospf);
261
262 ospf_area_range_delete(area, rn);
263
264 return 1;
265 }
266
267 int ospf_area_range_substitute_set(struct ospf *ospf, struct in_addr area_id,
268 struct prefix_ipv4 *p, struct prefix_ipv4 *s)
269 {
270 struct ospf_area *area;
271 struct ospf_area_range *range;
272
273 area = ospf_area_get(ospf, area_id);
274 range = ospf_area_range_lookup(area, p);
275
276 if (range != NULL) {
277 if (!CHECK_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE)
278 || !CHECK_FLAG(range->flags, OSPF_AREA_RANGE_SUBSTITUTE))
279 ospf_schedule_abr_task(ospf);
280 } else {
281 range = ospf_area_range_new(p);
282 ospf_area_range_add(area, range);
283 ospf_schedule_abr_task(ospf);
284 }
285
286 SET_FLAG(range->flags, OSPF_AREA_RANGE_ADVERTISE);
287 SET_FLAG(range->flags, OSPF_AREA_RANGE_SUBSTITUTE);
288 range->subst_addr = s->prefix;
289 range->subst_masklen = s->prefixlen;
290
291 return 1;
292 }
293
294 int ospf_area_range_substitute_unset(struct ospf *ospf, struct in_addr area_id,
295 struct prefix_ipv4 *p)
296 {
297 struct ospf_area *area;
298 struct ospf_area_range *range;
299
300 area = ospf_area_lookup_by_area_id(ospf, area_id);
301 if (area == NULL)
302 return 0;
303
304 range = ospf_area_range_lookup(area, p);
305 if (range == NULL)
306 return 0;
307
308 if (CHECK_FLAG(range->flags, OSPF_AREA_RANGE_SUBSTITUTE))
309 if (ospf_area_range_active(range))
310 ospf_schedule_abr_task(ospf);
311
312 UNSET_FLAG(range->flags, OSPF_AREA_RANGE_SUBSTITUTE);
313 range->subst_addr.s_addr = INADDR_ANY;
314 range->subst_masklen = 0;
315
316 return 1;
317 }
318
319 int ospf_act_bb_connection(struct ospf *ospf)
320 {
321 if (ospf->backbone == NULL)
322 return 0;
323
324 return ospf->backbone->full_nbrs;
325 }
326
327 /* Determine whether this router is elected translator or not for area */
328 static int ospf_abr_nssa_am_elected(struct ospf_area *area)
329 {
330 struct route_node *rn;
331 struct ospf_lsa *lsa;
332 struct router_lsa *rlsa;
333 struct in_addr *best = NULL;
334 char buf[PREFIX_STRLEN];
335
336 LSDB_LOOP (ROUTER_LSDB(area), rn, lsa) {
337 /* sanity checks */
338 if (!lsa || (lsa->data->type != OSPF_ROUTER_LSA)
339 || IS_LSA_SELF(lsa))
340 continue;
341
342 rlsa = (struct router_lsa *)lsa->data;
343
344 /* ignore non-ABR routers */
345 if (!IS_ROUTER_LSA_BORDER(rlsa))
346 continue;
347
348 /* Router has Nt flag - always translate */
349 if (IS_ROUTER_LSA_NT(rlsa)) {
350 if (IS_DEBUG_OSPF_NSSA)
351 zlog_debug(
352 "ospf_abr_nssa_am_elected: router %pI4 asserts Nt",
353 &lsa->data->id);
354 return 0;
355 }
356
357 if (best == NULL)
358 best = &lsa->data->id;
359 else if (IPV4_ADDR_CMP(&best->s_addr, &lsa->data->id.s_addr)
360 < 0)
361 best = &lsa->data->id;
362 }
363
364 if (IS_DEBUG_OSPF_NSSA)
365 zlog_debug(
366 "ospf_abr_nssa_am_elected: best electable ABR is: %s",
367 (best) ? inet_ntop(AF_INET, best, buf, sizeof(buf)) :
368 "<none>");
369
370 if (best == NULL)
371 return 1;
372
373 if (IPV4_ADDR_CMP(&best->s_addr, &area->ospf->router_id.s_addr) < 0)
374 return 1;
375 else
376 return 0;
377 }
378
379 /* Check NSSA ABR status
380 * assumes there are nssa areas
381 */
382 void ospf_abr_nssa_check_status(struct ospf *ospf)
383 {
384 struct ospf_area *area;
385 struct listnode *lnode, *nnode;
386
387 for (ALL_LIST_ELEMENTS(ospf->areas, lnode, nnode, area)) {
388 uint8_t old_state = area->NSSATranslatorState;
389
390 if (area->external_routing != OSPF_AREA_NSSA)
391 continue;
392
393 if (IS_DEBUG_OSPF(nssa, NSSA))
394 zlog_debug(
395 "ospf_abr_nssa_check_status: checking area %pI4",
396 &area->area_id);
397
398 if (!IS_OSPF_ABR(area->ospf)) {
399 if (IS_DEBUG_OSPF(nssa, NSSA))
400 zlog_debug(
401 "ospf_abr_nssa_check_status: not ABR");
402 area->NSSATranslatorState =
403 OSPF_NSSA_TRANSLATE_DISABLED;
404 } else {
405 switch (area->NSSATranslatorRole) {
406 case OSPF_NSSA_ROLE_NEVER:
407 /* We never Translate Type-7 LSA. */
408 /* TODO: check previous state and flush? */
409 if (IS_DEBUG_OSPF(nssa, NSSA))
410 zlog_debug(
411 "ospf_abr_nssa_check_status: never translate");
412 area->NSSATranslatorState =
413 OSPF_NSSA_TRANSLATE_DISABLED;
414 break;
415
416 case OSPF_NSSA_ROLE_ALWAYS:
417 /* We always translate if we are an ABR
418 * TODO: originate new LSAs if state change?
419 * or let the nssa abr task take care of it?
420 */
421 if (IS_DEBUG_OSPF(nssa, NSSA))
422 zlog_debug(
423 "ospf_abr_nssa_check_status: translate always");
424 area->NSSATranslatorState =
425 OSPF_NSSA_TRANSLATE_ENABLED;
426 break;
427
428 case OSPF_NSSA_ROLE_CANDIDATE:
429 /* We are a candidate for Translation */
430 if (ospf_abr_nssa_am_elected(area) > 0) {
431 area->NSSATranslatorState =
432 OSPF_NSSA_TRANSLATE_ENABLED;
433 if (IS_DEBUG_OSPF(nssa, NSSA))
434 zlog_debug(
435 "ospf_abr_nssa_check_status: elected translator");
436 } else {
437 area->NSSATranslatorState =
438 OSPF_NSSA_TRANSLATE_DISABLED;
439 if (IS_DEBUG_OSPF(nssa, NSSA))
440 zlog_debug(
441 "ospf_abr_nssa_check_status: not elected");
442 }
443 break;
444 }
445 }
446 /* RFC3101, 3.1:
447 * All NSSA border routers must set the E-bit in the Type-1
448 * router-LSAs
449 * of their directly attached non-stub areas, even when they are
450 * not
451 * translating.
452 */
453 if (old_state != area->NSSATranslatorState) {
454 if (old_state == OSPF_NSSA_TRANSLATE_DISABLED)
455 ospf_asbr_status_update(ospf,
456 ++ospf->redistribute);
457 else if (area->NSSATranslatorState
458 == OSPF_NSSA_TRANSLATE_DISABLED)
459 ospf_asbr_status_update(ospf,
460 --ospf->redistribute);
461 }
462 }
463 }
464
465 /* Check area border router status. */
466 void ospf_check_abr_status(struct ospf *ospf)
467 {
468 struct ospf_area *area;
469 struct listnode *node, *nnode;
470 int bb_configured = 0;
471 int bb_act_attached = 0;
472 int areas_configured = 0;
473 int areas_act_attached = 0;
474 uint8_t new_flags = ospf->flags;
475
476 if (IS_DEBUG_OSPF_EVENT)
477 zlog_debug("ospf_check_abr_status(): Start");
478
479 for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) {
480 if (listcount(area->oiflist)) {
481 areas_configured++;
482
483 if (OSPF_IS_AREA_BACKBONE(area))
484 bb_configured = 1;
485 }
486
487 if (ospf_area_actively_attached(area)) {
488 areas_act_attached++;
489
490 if (OSPF_IS_AREA_BACKBONE(area))
491 bb_act_attached = 1;
492 }
493 }
494
495 if (IS_DEBUG_OSPF_EVENT) {
496 zlog_debug("ospf_check_abr_status(): looked through areas");
497 zlog_debug("ospf_check_abr_status(): bb_configured: %d",
498 bb_configured);
499 zlog_debug("ospf_check_abr_status(): bb_act_attached: %d",
500 bb_act_attached);
501 zlog_debug("ospf_check_abr_status(): areas_configured: %d",
502 areas_configured);
503 zlog_debug("ospf_check_abr_status(): areas_act_attached: %d",
504 areas_act_attached);
505 }
506
507 switch (ospf->abr_type) {
508 case OSPF_ABR_SHORTCUT:
509 case OSPF_ABR_STAND:
510 if (areas_act_attached > 1)
511 SET_FLAG(new_flags, OSPF_FLAG_ABR);
512 else
513 UNSET_FLAG(new_flags, OSPF_FLAG_ABR);
514 break;
515
516 case OSPF_ABR_IBM:
517 if ((areas_act_attached > 1) && bb_configured)
518 SET_FLAG(new_flags, OSPF_FLAG_ABR);
519 else
520 UNSET_FLAG(new_flags, OSPF_FLAG_ABR);
521 break;
522
523 case OSPF_ABR_CISCO:
524 if ((areas_configured > 1) && bb_act_attached)
525 SET_FLAG(new_flags, OSPF_FLAG_ABR);
526 else
527 UNSET_FLAG(new_flags, OSPF_FLAG_ABR);
528 break;
529 default:
530 break;
531 }
532
533 if (new_flags != ospf->flags) {
534 ospf_spf_calculate_schedule(ospf, SPF_FLAG_ABR_STATUS_CHANGE);
535 if (IS_DEBUG_OSPF_EVENT)
536 zlog_debug(
537 "ospf_check_abr_status(): new router flags: %x",
538 new_flags);
539 ospf->flags = new_flags;
540 ospf_router_lsa_update(ospf);
541 }
542 }
543
544 static void ospf_abr_update_aggregate(struct ospf_area_range *range,
545 struct ospf_route * or,
546 struct ospf_area *area)
547 {
548 if (IS_DEBUG_OSPF_EVENT)
549 zlog_debug("ospf_abr_update_aggregate(): Start");
550
551 if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED)
552 && (range->cost != OSPF_STUB_MAX_METRIC_SUMMARY_COST)) {
553 range->cost = OSPF_STUB_MAX_METRIC_SUMMARY_COST;
554 if (IS_DEBUG_OSPF_EVENT)
555 zlog_debug(
556 "ospf_abr_update_aggregate(): use summary max-metric 0x%08x",
557 range->cost);
558 } else if (range->cost_config != OSPF_AREA_RANGE_COST_UNSPEC) {
559 if (IS_DEBUG_OSPF_EVENT)
560 zlog_debug(
561 "ospf_abr_update_aggregate(): use configured cost %d",
562 range->cost_config);
563
564 range->cost = range->cost_config;
565 } else {
566 if (range->specifics == 0) {
567 if (IS_DEBUG_OSPF_EVENT)
568 zlog_debug(
569 "ospf_abr_update_aggregate(): use or->cost %d",
570 or->cost);
571
572 range->cost = or->cost; /* 1st time get 1st cost */
573 }
574
575 if (or->cost > range->cost) {
576 if (IS_DEBUG_OSPF_EVENT)
577 zlog_debug(
578 "ospf_abr_update_aggregate(): update to %d",
579 or->cost);
580
581 range->cost = or->cost;
582 }
583 }
584
585 range->specifics++;
586 }
587
588 static void set_metric(struct ospf_lsa *lsa, uint32_t metric)
589 {
590 struct summary_lsa *header;
591 uint8_t *mp;
592 metric = htonl(metric);
593 mp = (uint8_t *)&metric;
594 mp++;
595 header = (struct summary_lsa *)lsa->data;
596 memcpy(header->metric, mp, 3);
597 }
598
599 /* ospf_abr_translate_nssa */
600 static int ospf_abr_translate_nssa(struct ospf_area *area, struct ospf_lsa *lsa)
601 {
602 /* Incoming Type-7 or later aggregated Type-7
603 *
604 * LSA is skipped if P-bit is off.
605 * LSA is aggregated if within range.
606 *
607 * The Type-7 is translated, Installed/Approved as a Type-5 into
608 * global LSDB, then Flooded through AS
609 *
610 * Later, any Unapproved Translated Type-5's are flushed/discarded
611 */
612
613 struct ospf_lsa *old = NULL, *new = NULL;
614 struct as_external_lsa *ext7;
615 struct prefix_ipv4 p;
616
617 if (!CHECK_FLAG(lsa->data->options, OSPF_OPTION_NP)) {
618 if (IS_DEBUG_OSPF_NSSA)
619 zlog_debug(
620 "ospf_abr_translate_nssa(): LSA Id %pI4, P-bit off, NO Translation",
621 &lsa->data->id);
622 return 1;
623 }
624
625 if (IS_DEBUG_OSPF_NSSA)
626 zlog_debug(
627 "ospf_abr_translate_nssa(): LSA Id %pI4, TRANSLATING 7 to 5",
628 &lsa->data->id);
629
630 ext7 = (struct as_external_lsa *)(lsa->data);
631 p.prefix = lsa->data->id;
632 p.prefixlen = ip_masklen(ext7->mask);
633
634 if (ext7->e[0].fwd_addr.s_addr == OSPF_DEFAULT_DESTINATION) {
635 if (IS_DEBUG_OSPF_NSSA)
636 zlog_debug(
637 "ospf_abr_translate_nssa(): LSA Id %pI4, Forward address is 0, NO Translation",
638 &lsa->data->id);
639 return 1;
640 }
641
642 /* try find existing AS-External LSA for this prefix */
643 old = ospf_external_info_find_lsa(area->ospf, &p);
644
645 if (CHECK_FLAG(lsa->flags, OSPF_LSA_IN_MAXAGE)) {
646 /* if type-7 is removed, remove old translated type-5 lsa */
647 if (old) {
648 UNSET_FLAG(old->flags, OSPF_LSA_APPROVED);
649 if (IS_DEBUG_OSPF_NSSA)
650 zlog_debug(
651 "ospf_abr_translate_nssa(): remove old translated LSA id %pI4",
652 &old->data->id);
653 }
654 /* if type-7 is removed and type-5 does not exist, do not
655 * originate */
656 return 1;
657 }
658
659 if (old && CHECK_FLAG(old->flags, OSPF_LSA_APPROVED)) {
660 if (IS_DEBUG_OSPF_NSSA)
661 zlog_debug(
662 "ospf_abr_translate_nssa(): found old translated LSA Id %pI4, refreshing",
663 &old->data->id);
664
665 /* refresh */
666 new = ospf_translated_nssa_refresh(area->ospf, lsa, old);
667 if (!new) {
668 if (IS_DEBUG_OSPF_NSSA)
669 zlog_debug(
670 "ospf_abr_translate_nssa(): could not refresh translated LSA Id %pI4",
671 &old->data->id);
672 }
673 } else {
674 /* no existing external route for this LSA Id
675 * originate translated LSA
676 */
677
678 if (ospf_translated_nssa_originate(area->ospf, lsa) == NULL) {
679 if (IS_DEBUG_OSPF_NSSA)
680 zlog_debug(
681 "ospf_abr_translate_nssa(): Could not translate Type-7 for %pI4 to Type-5",
682 &lsa->data->id);
683 return 1;
684 }
685 }
686
687 /* Area where Aggregate testing will be inserted, just like summary
688 advertisements */
689 /* ospf_abr_check_nssa_range (p_arg, lsa-> cost, lsa -> area); */
690
691 return 0;
692 }
693
694 static void ospf_abr_translate_nssa_range(struct prefix_ipv4 *p, uint32_t cost)
695 {
696 /* The Type-7 is created from the aggregated prefix and forwarded
697 for lsa installation and flooding... to be added... */
698 }
699
700 void ospf_abr_announce_network_to_area(struct prefix_ipv4 *p, uint32_t cost,
701 struct ospf_area *area)
702 {
703 struct ospf_lsa *lsa, *old = NULL;
704 struct summary_lsa *sl = NULL;
705 uint32_t full_cost;
706
707 if (IS_DEBUG_OSPF_EVENT)
708 zlog_debug("ospf_abr_announce_network_to_area(): Start");
709
710 if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED))
711 full_cost = OSPF_STUB_MAX_METRIC_SUMMARY_COST;
712 else
713 full_cost = cost;
714
715 old = ospf_lsa_lookup_by_prefix(area->lsdb, OSPF_SUMMARY_LSA, p,
716 area->ospf->router_id);
717 if (old) {
718 if (IS_DEBUG_OSPF_EVENT)
719 zlog_debug(
720 "ospf_abr_announce_network_to_area(): old summary found");
721
722 sl = (struct summary_lsa *)old->data;
723
724 if (IS_DEBUG_OSPF_EVENT)
725 zlog_debug(
726 "ospf_abr_announce_network_to_area(): old metric: %d, new metric: %d",
727 GET_METRIC(sl->metric), cost);
728
729 if ((GET_METRIC(sl->metric) == full_cost)
730 && ((old->flags & OSPF_LSA_IN_MAXAGE) == 0)) {
731 /* unchanged. simply reapprove it */
732 if (IS_DEBUG_OSPF_EVENT)
733 zlog_debug(
734 "ospf_abr_announce_network_to_area(): old summary approved");
735 SET_FLAG(old->flags, OSPF_LSA_APPROVED);
736 } else {
737 /* LSA is changed, refresh it */
738 if (IS_DEBUG_OSPF_EVENT)
739 zlog_debug(
740 "ospf_abr_announce_network_to_area(): refreshing summary");
741 set_metric(old, full_cost);
742 lsa = ospf_lsa_refresh(area->ospf, old);
743
744 if (!lsa) {
745 flog_warn(EC_OSPF_LSA_MISSING,
746 "%s: Could not refresh %pFX to %pI4",
747 __func__, (struct prefix *)p,
748 &area->area_id);
749 return;
750 }
751
752 SET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
753 /* This will flood through area. */
754 }
755 } else {
756 if (IS_DEBUG_OSPF_EVENT)
757 zlog_debug(
758 "ospf_abr_announce_network_to_area(): creating new summary");
759 lsa = ospf_summary_lsa_originate(p, full_cost, area);
760 /* This will flood through area. */
761
762 if (!lsa) {
763 flog_warn(EC_OSPF_LSA_MISSING,
764 "%s: Could not originate %pFX to %pi4",
765 __func__, (struct prefix *)p,
766 &area->area_id);
767 return;
768 }
769
770 SET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
771 if (IS_DEBUG_OSPF_EVENT)
772 zlog_debug(
773 "ospf_abr_announce_network_to_area(): flooding new version of summary");
774 }
775
776 if (IS_DEBUG_OSPF_EVENT)
777 zlog_debug("ospf_abr_announce_network_to_area(): Stop");
778 }
779
780 static int ospf_abr_nexthops_belong_to_area(struct ospf_route * or,
781 struct ospf_area *area)
782 {
783 struct listnode *node, *nnode;
784 struct ospf_path *path;
785 struct ospf_interface *oi;
786
787 for (ALL_LIST_ELEMENTS_RO(or->paths, node, path))
788 for (ALL_LIST_ELEMENTS_RO(area->oiflist, nnode, oi))
789 if (oi->ifp && oi->ifp->ifindex == path->ifindex)
790 return 1;
791
792 return 0;
793 }
794
795 static int ospf_abr_should_accept(struct prefix_ipv4 *p, struct ospf_area *area)
796 {
797 if (IMPORT_NAME(area)) {
798 if (IMPORT_LIST(area) == NULL)
799 IMPORT_LIST(area) =
800 access_list_lookup(AFI_IP, IMPORT_NAME(area));
801
802 if (IMPORT_LIST(area))
803 if (access_list_apply(IMPORT_LIST(area), p)
804 == FILTER_DENY)
805 return 0;
806 }
807
808 return 1;
809 }
810
811 static int ospf_abr_plist_in_check(struct ospf_area *area,
812 struct ospf_route * or,
813 struct prefix_ipv4 *p)
814 {
815 if (PREFIX_NAME_IN(area)) {
816 if (PREFIX_LIST_IN(area) == NULL)
817 PREFIX_LIST_IN(area) = prefix_list_lookup(
818 AFI_IP, PREFIX_NAME_IN(area));
819 if (PREFIX_LIST_IN(area))
820 if (prefix_list_apply(PREFIX_LIST_IN(area), p)
821 != PREFIX_PERMIT)
822 return 0;
823 }
824 return 1;
825 }
826
827 static int ospf_abr_plist_out_check(struct ospf_area *area,
828 struct ospf_route * or,
829 struct prefix_ipv4 *p)
830 {
831 if (PREFIX_NAME_OUT(area)) {
832 if (PREFIX_LIST_OUT(area) == NULL)
833 PREFIX_LIST_OUT(area) = prefix_list_lookup(
834 AFI_IP, PREFIX_NAME_OUT(area));
835 if (PREFIX_LIST_OUT(area))
836 if (prefix_list_apply(PREFIX_LIST_OUT(area), p)
837 != PREFIX_PERMIT)
838 return 0;
839 }
840 return 1;
841 }
842
843 static void ospf_abr_announce_network(struct ospf *ospf, struct prefix_ipv4 *p,
844 struct ospf_route * or)
845 {
846 struct ospf_area_range *range;
847 struct ospf_area *area, *or_area;
848 struct listnode *node;
849
850 if (IS_DEBUG_OSPF_EVENT)
851 zlog_debug("ospf_abr_announce_network(): Start");
852
853 or_area = ospf_area_lookup_by_area_id(ospf, or->u.std.area_id);
854 assert(or_area);
855
856 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
857 if (IS_DEBUG_OSPF_EVENT)
858 zlog_debug(
859 "ospf_abr_announce_network(): looking at area %pI4",
860 &area->area_id);
861
862 if (IPV4_ADDR_SAME(& or->u.std.area_id, &area->area_id))
863 continue;
864
865 if (ospf_abr_nexthops_belong_to_area(or, area))
866 continue;
867
868 if (!ospf_abr_should_accept(p, area)) {
869 if (IS_DEBUG_OSPF_EVENT)
870 zlog_debug(
871 "ospf_abr_announce_network(): prefix %pFX was denied by import-list",
872 p);
873 continue;
874 }
875
876 if (!ospf_abr_plist_in_check(area, or, p)) {
877 if (IS_DEBUG_OSPF_EVENT)
878 zlog_debug(
879 "ospf_abr_announce_network(): prefix %pFX was denied by prefix-list",
880 p);
881 continue;
882 }
883
884 if (area->external_routing != OSPF_AREA_DEFAULT
885 && area->no_summary) {
886 if (IS_DEBUG_OSPF_EVENT)
887 zlog_debug(
888 "ospf_abr_announce_network(): area %pI4 is stub and no_summary",
889 &area->area_id);
890 continue;
891 }
892
893 if (or->path_type == OSPF_PATH_INTER_AREA) {
894 if (IS_DEBUG_OSPF_EVENT)
895 zlog_debug(
896 "ospf_abr_announce_network(): this is inter-area route to %pFX",
897 p);
898
899 if (!OSPF_IS_AREA_BACKBONE(area))
900 ospf_abr_announce_network_to_area(p, or->cost,
901 area);
902 }
903
904 if (or->path_type == OSPF_PATH_INTRA_AREA) {
905 if (IS_DEBUG_OSPF_EVENT)
906 zlog_debug(
907 "ospf_abr_announce_network(): this is intra-area route to %pFX",
908 p);
909 if ((range = ospf_area_range_match(or_area, p))
910 && !ospf_area_is_transit(area))
911 ospf_abr_update_aggregate(range, or, area);
912 else
913 ospf_abr_announce_network_to_area(p, or->cost,
914 area);
915 }
916 }
917 }
918
919 static int ospf_abr_should_announce(struct ospf *ospf, struct prefix_ipv4 *p,
920 struct ospf_route * or)
921 {
922 struct ospf_area *area;
923
924 area = ospf_area_lookup_by_area_id(ospf, or->u.std.area_id);
925
926 assert(area);
927
928 if (EXPORT_NAME(area)) {
929 if (EXPORT_LIST(area) == NULL)
930 EXPORT_LIST(area) =
931 access_list_lookup(AFI_IP, EXPORT_NAME(area));
932
933 if (EXPORT_LIST(area))
934 if (access_list_apply(EXPORT_LIST(area), p)
935 == FILTER_DENY)
936 return 0;
937 }
938
939 return 1;
940 }
941
942 static void ospf_abr_process_nssa_translates(struct ospf *ospf)
943 {
944 /* Scan through all NSSA_LSDB records for all areas;
945
946 If P-bit is on, translate all Type-7's to 5's and aggregate or
947 flood install as approved in Type-5 LSDB with XLATE Flag on
948 later, do same for all aggregates... At end, DISCARD all
949 remaining UNAPPROVED Type-5's (Aggregate is for future ) */
950 struct listnode *node;
951 struct ospf_area *area;
952 struct route_node *rn;
953 struct ospf_lsa *lsa;
954
955 if (IS_DEBUG_OSPF_NSSA)
956 zlog_debug("ospf_abr_process_nssa_translates(): Start");
957
958 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
959 if (!area->NSSATranslatorState)
960 continue; /* skip if not translator */
961
962 if (area->external_routing != OSPF_AREA_NSSA)
963 continue; /* skip if not Nssa Area */
964
965 if (IS_DEBUG_OSPF_NSSA)
966 zlog_debug(
967 "ospf_abr_process_nssa_translates(): looking at area %pI4",
968 &area->area_id);
969
970 LSDB_LOOP (NSSA_LSDB(area), rn, lsa)
971 ospf_abr_translate_nssa(area, lsa);
972 }
973
974 if (IS_DEBUG_OSPF_NSSA)
975 zlog_debug("ospf_abr_process_nssa_translates(): Stop");
976 }
977
978 static void ospf_abr_process_network_rt(struct ospf *ospf,
979 struct route_table *rt)
980 {
981 struct ospf_area *area;
982 struct ospf_route * or ;
983 struct route_node *rn;
984
985 if (IS_DEBUG_OSPF_EVENT)
986 zlog_debug("ospf_abr_process_network_rt(): Start");
987
988 for (rn = route_top(rt); rn; rn = route_next(rn)) {
989 if ((or = rn->info) == NULL)
990 continue;
991
992 if (!(area = ospf_area_lookup_by_area_id(ospf,
993 or->u.std.area_id))) {
994 if (IS_DEBUG_OSPF_EVENT)
995 zlog_debug(
996 "ospf_abr_process_network_rt(): area %pI4 no longer exists",
997 &or->u.std.area_id);
998 continue;
999 }
1000
1001 if (IS_DEBUG_OSPF_EVENT)
1002 zlog_debug(
1003 "ospf_abr_process_network_rt(): this is a route to %pFX",
1004 &rn->p);
1005 if (or->path_type >= OSPF_PATH_TYPE1_EXTERNAL) {
1006 if (IS_DEBUG_OSPF_EVENT)
1007 zlog_debug(
1008 "ospf_abr_process_network_rt(): this is an External router, skipping");
1009 continue;
1010 }
1011
1012 if (or->cost >= OSPF_LS_INFINITY) {
1013 if (IS_DEBUG_OSPF_EVENT)
1014 zlog_debug(
1015 "ospf_abr_process_network_rt(): this route's cost is infinity, skipping");
1016 continue;
1017 }
1018
1019 if (or->type == OSPF_DESTINATION_DISCARD) {
1020 if (IS_DEBUG_OSPF_EVENT)
1021 zlog_debug(
1022 "ospf_abr_process_network_rt(): this is a discard entry, skipping");
1023 continue;
1024 }
1025
1026 if (
1027 or->path_type == OSPF_PATH_INTRA_AREA
1028 && !ospf_abr_should_announce(
1029 ospf, (struct prefix_ipv4 *)&rn->p,
1030 or)) {
1031 if (IS_DEBUG_OSPF_EVENT)
1032 zlog_debug(
1033 "ospf_abr_process_network_rt(): denied by export-list");
1034 continue;
1035 }
1036
1037 if (
1038 or->path_type == OSPF_PATH_INTRA_AREA
1039 && !ospf_abr_plist_out_check(
1040 area, or,
1041 (struct prefix_ipv4 *)&rn->p)) {
1042 if (IS_DEBUG_OSPF_EVENT)
1043 zlog_debug(
1044 "ospf_abr_process_network_rt(): denied by prefix-list");
1045 continue;
1046 }
1047
1048 if ((or->path_type == OSPF_PATH_INTER_AREA)
1049 && !OSPF_IS_AREA_ID_BACKBONE(or->u.std.area_id)) {
1050 if (IS_DEBUG_OSPF_EVENT)
1051 zlog_debug(
1052 "ospf_abr_process_network_rt(): this is route is not backbone one, skipping");
1053 continue;
1054 }
1055
1056
1057 if ((ospf->abr_type == OSPF_ABR_CISCO)
1058 || (ospf->abr_type == OSPF_ABR_IBM))
1059
1060 if (!ospf_act_bb_connection(ospf) &&
1061 or->path_type != OSPF_PATH_INTRA_AREA) {
1062 if (IS_DEBUG_OSPF_EVENT)
1063 zlog_debug(
1064 "ospf_abr_process_network_rt(): ALT ABR: No BB connection, skip not intra-area routes");
1065 continue;
1066 }
1067
1068 if (IS_DEBUG_OSPF_EVENT)
1069 zlog_debug("ospf_abr_process_network_rt(): announcing");
1070 ospf_abr_announce_network(ospf, (struct prefix_ipv4 *)&rn->p,
1071 or);
1072 }
1073
1074 if (IS_DEBUG_OSPF_EVENT)
1075 zlog_debug("ospf_abr_process_network_rt(): Stop");
1076 }
1077
1078 static void ospf_abr_announce_rtr_to_area(struct prefix_ipv4 *p, uint32_t cost,
1079 struct ospf_area *area)
1080 {
1081 struct ospf_lsa *lsa, *old = NULL;
1082 struct summary_lsa *slsa = NULL;
1083
1084 if (IS_DEBUG_OSPF_EVENT)
1085 zlog_debug("ospf_abr_announce_rtr_to_area(): Start");
1086
1087 old = ospf_lsa_lookup_by_prefix(area->lsdb, OSPF_ASBR_SUMMARY_LSA, p,
1088 area->ospf->router_id);
1089 if (old) {
1090 if (IS_DEBUG_OSPF_EVENT)
1091 zlog_debug(
1092 "ospf_abr_announce_rtr_to_area(): old summary found");
1093 slsa = (struct summary_lsa *)old->data;
1094
1095 if (IS_DEBUG_OSPF_EVENT)
1096 zlog_debug(
1097 "ospf_abr_announce_network_to_area(): old metric: %d, new metric: %d",
1098 GET_METRIC(slsa->metric), cost);
1099 }
1100
1101 if (old && (GET_METRIC(slsa->metric) == cost)
1102 && ((old->flags & OSPF_LSA_IN_MAXAGE) == 0)) {
1103 if (IS_DEBUG_OSPF_EVENT)
1104 zlog_debug(
1105 "ospf_abr_announce_rtr_to_area(): old summary approved");
1106 SET_FLAG(old->flags, OSPF_LSA_APPROVED);
1107 } else {
1108 if (IS_DEBUG_OSPF_EVENT)
1109 zlog_debug("ospf_abr_announce_rtr_to_area(): 2.2");
1110
1111 if (old) {
1112 set_metric(old, cost);
1113 lsa = ospf_lsa_refresh(area->ospf, old);
1114 } else
1115 lsa = ospf_summary_asbr_lsa_originate(p, cost, area);
1116 if (!lsa) {
1117 flog_warn(EC_OSPF_LSA_MISSING,
1118 "%s: Could not refresh/originate %pFX to %pI4",
1119 __func__, (struct prefix *)p,
1120 &area->area_id);
1121 return;
1122 }
1123
1124 if (IS_DEBUG_OSPF_EVENT)
1125 zlog_debug(
1126 "ospf_abr_announce_rtr_to_area(): flooding new version of summary");
1127
1128 /*
1129 zlog_info ("ospf_abr_announce_rtr_to_area(): creating new
1130 summary");
1131 lsa = ospf_summary_asbr_lsa (p, cost, area, old); */
1132
1133 SET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
1134 /* ospf_flood_through_area (area, NULL, lsa);*/
1135 }
1136
1137 if (IS_DEBUG_OSPF_EVENT)
1138 zlog_debug("ospf_abr_announce_rtr_to_area(): Stop");
1139 }
1140
1141
1142 static void ospf_abr_announce_rtr(struct ospf *ospf, struct prefix_ipv4 *p,
1143 struct ospf_route * or)
1144 {
1145 struct listnode *node;
1146 struct ospf_area *area;
1147
1148 if (IS_DEBUG_OSPF_EVENT)
1149 zlog_debug("ospf_abr_announce_rtr(): Start");
1150
1151 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
1152 if (IS_DEBUG_OSPF_EVENT)
1153 zlog_debug(
1154 "ospf_abr_announce_rtr(): looking at area %pI4",
1155 &area->area_id);
1156
1157 if (IPV4_ADDR_SAME(& or->u.std.area_id, &area->area_id))
1158 continue;
1159
1160 if (ospf_abr_nexthops_belong_to_area(or, area))
1161 continue;
1162
1163 /* RFC3101: Do not generate ASBR type 4 LSA if NSSA ABR */
1164 if (or->u.std.external_routing == OSPF_AREA_NSSA) {
1165 if (IS_DEBUG_OSPF_EVENT)
1166 zlog_debug(
1167 "ospf_abr_announce_rtr(): do not generate LSA Type-4 %pI4 from NSSA",
1168 &p->prefix);
1169 continue;
1170 }
1171
1172 if (area->external_routing != OSPF_AREA_DEFAULT) {
1173 if (IS_DEBUG_OSPF_EVENT)
1174 zlog_debug(
1175 "ospf_abr_announce_rtr(): area %pI4 doesn't support external routing",
1176 &area->area_id);
1177 continue;
1178 }
1179
1180 if (or->path_type == OSPF_PATH_INTER_AREA) {
1181 if (IS_DEBUG_OSPF_EVENT)
1182 zlog_debug(
1183 "ospf_abr_announce_rtr(): this is inter-area route to %pI4",
1184 &p->prefix);
1185 if (!OSPF_IS_AREA_BACKBONE(area))
1186 ospf_abr_announce_rtr_to_area(p, or->cost,
1187 area);
1188 }
1189
1190 if (or->path_type == OSPF_PATH_INTRA_AREA) {
1191 if (IS_DEBUG_OSPF_EVENT)
1192 zlog_debug(
1193 "ospf_abr_announce_rtr(): this is intra-area route to %pI4",
1194 &p->prefix);
1195 ospf_abr_announce_rtr_to_area(p, or->cost, area);
1196 }
1197 }
1198
1199 if (IS_DEBUG_OSPF_EVENT)
1200 zlog_debug("ospf_abr_announce_rtr(): Stop");
1201 }
1202
1203 static void ospf_abr_process_router_rt(struct ospf *ospf,
1204 struct route_table *rt)
1205 {
1206 struct ospf_route * or ;
1207 struct route_node *rn;
1208 struct list *l;
1209
1210 if (IS_DEBUG_OSPF_EVENT)
1211 zlog_debug("ospf_abr_process_router_rt(): Start");
1212
1213 for (rn = route_top(rt); rn; rn = route_next(rn)) {
1214 struct listnode *node, *nnode;
1215 char flag = 0;
1216 struct ospf_route *best = NULL;
1217
1218 if (rn->info == NULL)
1219 continue;
1220
1221 l = rn->info;
1222
1223 if (IS_DEBUG_OSPF_EVENT)
1224 zlog_debug(
1225 "ospf_abr_process_router_rt(): this is a route to %pI4",
1226 &rn->p.u.prefix4);
1227
1228 for (ALL_LIST_ELEMENTS(l, node, nnode, or)) {
1229 if (!ospf_area_lookup_by_area_id(ospf,
1230 or->u.std.area_id)) {
1231 if (IS_DEBUG_OSPF_EVENT)
1232 zlog_debug(
1233 "ospf_abr_process_router_rt(): area %pI4 no longer exists",
1234 &or->u.std.area_id);
1235 continue;
1236 }
1237
1238
1239 if (!CHECK_FLAG(or->u.std.flags, ROUTER_LSA_EXTERNAL)) {
1240 if (IS_DEBUG_OSPF_EVENT)
1241 zlog_debug(
1242 "ospf_abr_process_router_rt(): This is not an ASBR, skipping");
1243 continue;
1244 }
1245
1246 if (!flag) {
1247 best = ospf_find_asbr_route(
1248 ospf, rt, (struct prefix_ipv4 *)&rn->p);
1249 flag = 1;
1250 }
1251
1252 if (best == NULL)
1253 continue;
1254
1255 if (or != best) {
1256 if (IS_DEBUG_OSPF_EVENT)
1257 zlog_debug(
1258 "ospf_abr_process_router_rt(): This route is not the best among possible, skipping");
1259 continue;
1260 }
1261
1262 if (
1263 or->path_type == OSPF_PATH_INTER_AREA
1264 && !OSPF_IS_AREA_ID_BACKBONE(
1265 or->u.std.area_id)) {
1266 if (IS_DEBUG_OSPF_EVENT)
1267 zlog_debug(
1268 "ospf_abr_process_router_rt(): This route is not a backbone one, skipping");
1269 continue;
1270 }
1271
1272 if (or->cost >= OSPF_LS_INFINITY) {
1273 if (IS_DEBUG_OSPF_EVENT)
1274 zlog_debug(
1275 "ospf_abr_process_router_rt(): This route has LS_INFINITY metric, skipping");
1276 continue;
1277 }
1278
1279 if (ospf->abr_type == OSPF_ABR_CISCO
1280 || ospf->abr_type == OSPF_ABR_IBM)
1281 if (!ospf_act_bb_connection(ospf) &&
1282 or->path_type != OSPF_PATH_INTRA_AREA) {
1283 if (IS_DEBUG_OSPF_EVENT)
1284 zlog_debug(
1285 "ospf_abr_process_network_rt(): ALT ABR: No BB connection, skip not intra-area routes");
1286 continue;
1287 }
1288
1289 ospf_abr_announce_rtr(ospf,
1290 (struct prefix_ipv4 *)&rn->p, or);
1291 }
1292 }
1293
1294 if (IS_DEBUG_OSPF_EVENT)
1295 zlog_debug("ospf_abr_process_router_rt(): Stop");
1296 }
1297
1298 static void
1299 ospf_abr_unapprove_translates(struct ospf *ospf) /* For NSSA Translations */
1300 {
1301 struct ospf_lsa *lsa;
1302 struct route_node *rn;
1303
1304 if (IS_DEBUG_OSPF_NSSA)
1305 zlog_debug("ospf_abr_unapprove_translates(): Start");
1306
1307 /* NSSA Translator is not checked, because it may have gone away,
1308 and we would want to flush any residuals anyway */
1309
1310 LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa)
1311 if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) {
1312 UNSET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
1313 if (IS_DEBUG_OSPF_NSSA)
1314 zlog_debug(
1315 "ospf_abr_unapprove_translates(): approved unset on link id %pI4",
1316 &lsa->data->id);
1317 }
1318
1319 if (IS_DEBUG_OSPF_NSSA)
1320 zlog_debug("ospf_abr_unapprove_translates(): Stop");
1321 }
1322
1323 static void ospf_abr_unapprove_summaries(struct ospf *ospf)
1324 {
1325 struct listnode *node;
1326 struct ospf_area *area;
1327 struct route_node *rn;
1328 struct ospf_lsa *lsa;
1329
1330 if (IS_DEBUG_OSPF_EVENT)
1331 zlog_debug("ospf_abr_unapprove_summaries(): Start");
1332
1333 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
1334 if (IS_DEBUG_OSPF_EVENT)
1335 zlog_debug(
1336 "ospf_abr_unapprove_summaries(): considering area %pI4",
1337 &area->area_id);
1338 LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa)
1339 if (ospf_lsa_is_self_originated(ospf, lsa)) {
1340 if (IS_DEBUG_OSPF_EVENT)
1341 zlog_debug(
1342 "ospf_abr_unapprove_summaries(): approved unset on summary link id %pI4",
1343 &lsa->data->id);
1344 UNSET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
1345 }
1346
1347 LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa)
1348 if (ospf_lsa_is_self_originated(ospf, lsa)) {
1349 if (IS_DEBUG_OSPF_EVENT)
1350 zlog_debug(
1351 "ospf_abr_unapprove_summaries(): approved unset on asbr-summary link id %pI4",
1352 &lsa->data->id);
1353 UNSET_FLAG(lsa->flags, OSPF_LSA_APPROVED);
1354 }
1355 }
1356
1357 if (IS_DEBUG_OSPF_EVENT)
1358 zlog_debug("ospf_abr_unapprove_summaries(): Stop");
1359 }
1360
1361 static void ospf_abr_prepare_aggregates(struct ospf *ospf)
1362 {
1363 struct listnode *node;
1364 struct route_node *rn;
1365 struct ospf_area_range *range;
1366 struct ospf_area *area;
1367
1368 if (IS_DEBUG_OSPF_EVENT)
1369 zlog_debug("ospf_abr_prepare_aggregates(): Start");
1370
1371 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
1372 for (rn = route_top(area->ranges); rn; rn = route_next(rn))
1373 if ((range = rn->info) != NULL) {
1374 range->cost = 0;
1375 range->specifics = 0;
1376 }
1377 }
1378
1379 if (IS_DEBUG_OSPF_EVENT)
1380 zlog_debug("ospf_abr_prepare_aggregates(): Stop");
1381 }
1382
1383 static void ospf_abr_announce_aggregates(struct ospf *ospf)
1384 {
1385 struct ospf_area *area, *ar;
1386 struct ospf_area_range *range;
1387 struct route_node *rn;
1388 struct prefix p;
1389 struct listnode *node, *n;
1390
1391 if (IS_DEBUG_OSPF_EVENT)
1392 zlog_debug("ospf_abr_announce_aggregates(): Start");
1393
1394 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
1395 if (IS_DEBUG_OSPF_EVENT)
1396 zlog_debug(
1397 "ospf_abr_announce_aggregates(): looking at area %pI4",
1398 &area->area_id);
1399
1400 for (rn = route_top(area->ranges); rn; rn = route_next(rn))
1401 if ((range = rn->info)) {
1402 if (!CHECK_FLAG(range->flags,
1403 OSPF_AREA_RANGE_ADVERTISE)) {
1404 if (IS_DEBUG_OSPF_EVENT)
1405 zlog_debug(
1406 "ospf_abr_announce_aggregates(): discarding suppress-ranges");
1407 continue;
1408 }
1409
1410 p.family = AF_INET;
1411 p.u.prefix4 = range->addr;
1412 p.prefixlen = range->masklen;
1413
1414 if (IS_DEBUG_OSPF_EVENT)
1415 zlog_debug(
1416 "ospf_abr_announce_aggregates(): this is range: %pFX",
1417 &p);
1418
1419 if (CHECK_FLAG(range->flags,
1420 OSPF_AREA_RANGE_SUBSTITUTE)) {
1421 p.family = AF_INET;
1422 p.u.prefix4 = range->subst_addr;
1423 p.prefixlen = range->subst_masklen;
1424 }
1425
1426 if (range->specifics) {
1427 if (IS_DEBUG_OSPF_EVENT)
1428 zlog_debug(
1429 "ospf_abr_announce_aggregates(): active range");
1430
1431 for (ALL_LIST_ELEMENTS_RO(ospf->areas,
1432 n, ar)) {
1433 if (ar == area)
1434 continue;
1435
1436 /* We do not check nexthops
1437 here, because
1438 intra-area routes can be
1439 associated with
1440 one area only */
1441
1442 /* backbone routes are not
1443 summarized
1444 when announced into transit
1445 areas */
1446
1447 if (ospf_area_is_transit(ar)
1448 && OSPF_IS_AREA_BACKBONE(
1449 area)) {
1450 if (IS_DEBUG_OSPF_EVENT)
1451 zlog_debug(
1452 "ospf_abr_announce_aggregates(): Skipping announcement of BB aggregate into a transit area");
1453 continue;
1454 }
1455 ospf_abr_announce_network_to_area(
1456 (struct prefix_ipv4
1457 *)&p,
1458 range->cost, ar);
1459 }
1460 }
1461 }
1462 }
1463
1464 if (IS_DEBUG_OSPF_EVENT)
1465 zlog_debug("ospf_abr_announce_aggregates(): Stop");
1466 }
1467
1468 static void
1469 ospf_abr_send_nssa_aggregates(struct ospf *ospf) /* temporarily turned off */
1470 {
1471 struct listnode *node; /*, n; */
1472 struct ospf_area *area; /*, *ar; */
1473 struct route_node *rn;
1474 struct ospf_area_range *range;
1475 struct prefix_ipv4 p;
1476
1477 if (IS_DEBUG_OSPF_NSSA)
1478 zlog_debug("ospf_abr_send_nssa_aggregates(): Start");
1479
1480 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
1481 if (!area->NSSATranslatorState)
1482 continue;
1483
1484 if (IS_DEBUG_OSPF_NSSA)
1485 zlog_debug(
1486 "ospf_abr_send_nssa_aggregates(): looking at area %pI4",
1487 &area->area_id);
1488
1489 for (rn = route_top(area->ranges); rn; rn = route_next(rn)) {
1490 if (rn->info == NULL)
1491 continue;
1492
1493 range = rn->info;
1494
1495 if (!CHECK_FLAG(range->flags,
1496 OSPF_AREA_RANGE_ADVERTISE)) {
1497 if (IS_DEBUG_OSPF_NSSA)
1498 zlog_debug(
1499 "ospf_abr_send_nssa_aggregates(): discarding suppress-ranges");
1500 continue;
1501 }
1502
1503 p.family = AF_INET;
1504 p.prefix = range->addr;
1505 p.prefixlen = range->masklen;
1506
1507 if (IS_DEBUG_OSPF_NSSA)
1508 zlog_debug(
1509 "ospf_abr_send_nssa_aggregates(): this is range: %pFX",
1510 &p);
1511
1512 if (CHECK_FLAG(range->flags,
1513 OSPF_AREA_RANGE_SUBSTITUTE)) {
1514 p.family = AF_INET;
1515 p.prefix = range->subst_addr;
1516 p.prefixlen = range->subst_masklen;
1517 }
1518
1519 if (range->specifics) {
1520 if (IS_DEBUG_OSPF_NSSA)
1521 zlog_debug(
1522 "ospf_abr_send_nssa_aggregates(): active range");
1523
1524 /* Fetch LSA-Type-7 from aggregate prefix, and
1525 * then
1526 * translate, Install (as Type-5), Approve, and
1527 * Flood
1528 */
1529 ospf_abr_translate_nssa_range(&p, range->cost);
1530 }
1531 } /* all area ranges*/
1532 } /* all areas */
1533
1534 if (IS_DEBUG_OSPF_NSSA)
1535 zlog_debug("ospf_abr_send_nssa_aggregates(): Stop");
1536 }
1537
1538 static void ospf_abr_announce_stub_defaults(struct ospf *ospf)
1539 {
1540 struct listnode *node;
1541 struct ospf_area *area;
1542 struct prefix_ipv4 p;
1543
1544 if (!IS_OSPF_ABR(ospf))
1545 return;
1546
1547 if (IS_DEBUG_OSPF_EVENT)
1548 zlog_debug("ospf_abr_announce_stub_defaults(): Start");
1549
1550 p.family = AF_INET;
1551 p.prefix.s_addr = OSPF_DEFAULT_DESTINATION;
1552 p.prefixlen = 0;
1553
1554 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
1555 if (IS_DEBUG_OSPF_EVENT)
1556 zlog_debug(
1557 "ospf_abr_announce_stub_defaults(): looking at area %pI4",
1558 &area->area_id);
1559
1560 if ((area->external_routing != OSPF_AREA_STUB)
1561 && (area->external_routing != OSPF_AREA_NSSA))
1562 continue;
1563
1564 if (OSPF_IS_AREA_BACKBONE(area))
1565 continue; /* Sanity Check */
1566
1567 if (IS_DEBUG_OSPF_EVENT)
1568 zlog_debug(
1569 "ospf_abr_announce_stub_defaults(): announcing 0.0.0.0/0 to area %pI4",
1570 &area->area_id);
1571 ospf_abr_announce_network_to_area(&p, area->default_cost, area);
1572 }
1573
1574 if (IS_DEBUG_OSPF_EVENT)
1575 zlog_debug("ospf_abr_announce_stub_defaults(): Stop");
1576 }
1577
1578 static int ospf_abr_remove_unapproved_translates_apply(struct ospf *ospf,
1579 struct ospf_lsa *lsa)
1580 {
1581 if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)
1582 && !CHECK_FLAG(lsa->flags, OSPF_LSA_APPROVED)) {
1583 zlog_info(
1584 "ospf_abr_remove_unapproved_translates(): removing unapproved translates, ID: %pI4",
1585 &lsa->data->id);
1586
1587 /* FLUSH THROUGHOUT AS */
1588 ospf_lsa_flush_as(ospf, lsa);
1589
1590 /* DISCARD from LSDB */
1591 }
1592 return 0;
1593 }
1594
1595 static void ospf_abr_remove_unapproved_translates(struct ospf *ospf)
1596 {
1597 struct route_node *rn;
1598 struct ospf_lsa *lsa;
1599
1600 /* All AREA PROCESS should have APPROVED necessary LSAs */
1601 /* Remove any left over and not APPROVED */
1602 if (IS_DEBUG_OSPF_NSSA)
1603 zlog_debug("ospf_abr_remove_unapproved_translates(): Start");
1604
1605 LSDB_LOOP (EXTERNAL_LSDB(ospf), rn, lsa)
1606 ospf_abr_remove_unapproved_translates_apply(ospf, lsa);
1607
1608 if (IS_DEBUG_OSPF_NSSA)
1609 zlog_debug("ospf_abr_remove_unapproved_translates(): Stop");
1610 }
1611
1612 static void ospf_abr_remove_unapproved_summaries(struct ospf *ospf)
1613 {
1614 struct listnode *node;
1615 struct ospf_area *area;
1616 struct route_node *rn;
1617 struct ospf_lsa *lsa;
1618
1619 if (IS_DEBUG_OSPF_EVENT)
1620 zlog_debug("ospf_abr_remove_unapproved_summaries(): Start");
1621
1622 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
1623 if (IS_DEBUG_OSPF_EVENT)
1624 zlog_debug(
1625 "ospf_abr_remove_unapproved_summaries(): looking at area %pI4",
1626 &area->area_id);
1627
1628 LSDB_LOOP (SUMMARY_LSDB(area), rn, lsa)
1629 if (ospf_lsa_is_self_originated(ospf, lsa))
1630 if (!CHECK_FLAG(lsa->flags, OSPF_LSA_APPROVED))
1631 ospf_lsa_flush_area(lsa, area);
1632
1633 LSDB_LOOP (ASBR_SUMMARY_LSDB(area), rn, lsa)
1634 if (ospf_lsa_is_self_originated(ospf, lsa))
1635 if (!CHECK_FLAG(lsa->flags, OSPF_LSA_APPROVED))
1636 ospf_lsa_flush_area(lsa, area);
1637 }
1638
1639 if (IS_DEBUG_OSPF_EVENT)
1640 zlog_debug("ospf_abr_remove_unapproved_summaries(): Stop");
1641 }
1642
1643 static void ospf_abr_manage_discard_routes(struct ospf *ospf)
1644 {
1645 struct listnode *node, *nnode;
1646 struct route_node *rn;
1647 struct ospf_area *area;
1648 struct ospf_area_range *range;
1649
1650 for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area))
1651 for (rn = route_top(area->ranges); rn; rn = route_next(rn))
1652 if ((range = rn->info) != NULL)
1653 if (CHECK_FLAG(range->flags,
1654 OSPF_AREA_RANGE_ADVERTISE)) {
1655 if (range->specifics)
1656 ospf_add_discard_route(
1657 ospf, ospf->new_table,
1658 area,
1659 (struct prefix_ipv4
1660 *)&rn->p);
1661 else
1662 ospf_delete_discard_route(
1663 ospf, ospf->new_table,
1664 (struct prefix_ipv4
1665 *)&rn->p);
1666 }
1667 }
1668
1669 /* This is the function taking care about ABR NSSA, i.e. NSSA
1670 Translator, -LSA aggregation and flooding. For all NSSAs
1671
1672 Any SELF-AS-LSA is in the Type-5 LSDB and Type-7 LSDB. These LSA's
1673 are refreshed from the Type-5 LSDB, installed into the Type-7 LSDB
1674 with the P-bit set.
1675
1676 Any received Type-5s are legal for an ABR, else illegal for IR.
1677 Received Type-7s are installed, by area, with incoming P-bit. They
1678 are flooded; if the Elected NSSA Translator, then P-bit off.
1679
1680 Additionally, this ABR will place "translated type-7's" into the
1681 Type-5 LSDB in order to keep track of APPROVAL or not.
1682
1683 It will scan through every area, looking for Type-7 LSAs with P-Bit
1684 SET. The Type-7's are either AS-FLOODED & 5-INSTALLED or
1685 AGGREGATED. Later, the AGGREGATED LSAs are AS-FLOODED &
1686 5-INSTALLED.
1687
1688 5-INSTALLED is into the Type-5 LSDB; Any UNAPPROVED Type-5 LSAs
1689 left over are FLUSHED and DISCARDED.
1690
1691 For External Calculations, any NSSA areas use the Type-7 AREA-LSDB,
1692 any ABR-non-NSSA areas use the Type-5 GLOBAL-LSDB. */
1693
1694 static void ospf_abr_nssa_task(struct ospf *ospf) /* called only if any_nssa */
1695 {
1696 if (IS_DEBUG_OSPF_NSSA)
1697 zlog_debug("Check for NSSA-ABR Tasks():");
1698
1699 if (!IS_OSPF_ABR(ospf))
1700 return;
1701
1702 if (!ospf->anyNSSA)
1703 return;
1704
1705 /* Each area must confirm TranslatorRole */
1706 if (IS_DEBUG_OSPF_NSSA)
1707 zlog_debug("ospf_abr_nssa_task(): Start");
1708
1709 /* For all Global Entries flagged "local-translate", unset APPROVED */
1710 if (IS_DEBUG_OSPF_NSSA)
1711 zlog_debug("ospf_abr_nssa_task(): unapprove translates");
1712
1713 ospf_abr_unapprove_translates(ospf);
1714
1715 /* RESET all Ranges in every Area, same as summaries */
1716 if (IS_DEBUG_OSPF_NSSA)
1717 zlog_debug("ospf_abr_nssa_task(): NSSA initialize aggregates");
1718 ospf_abr_prepare_aggregates(ospf); /*TURNED OFF just for now */
1719
1720 /* For all NSSAs, Type-7s, translate to 5's, INSTALL/FLOOD, or
1721 * Aggregate as Type-7
1722 * Install or Approve in Type-5 Global LSDB
1723 */
1724 if (IS_DEBUG_OSPF_NSSA)
1725 zlog_debug("ospf_abr_nssa_task(): process translates");
1726 ospf_abr_process_nssa_translates(ospf);
1727
1728 /* Translate/Send any "ranged" aggregates, and also 5-Install and
1729 * Approve
1730 * Scan Type-7's for aggregates, translate to Type-5's,
1731 * Install/Flood/Approve
1732 */
1733 if (IS_DEBUG_OSPF_NSSA)
1734 zlog_debug("ospf_abr_nssa_task(): send NSSA aggregates");
1735 ospf_abr_send_nssa_aggregates(ospf); /*TURNED OFF FOR NOW */
1736
1737 /* Send any NSSA defaults as Type-5
1738 *if (IS_DEBUG_OSPF_NSSA)
1739 * zlog_debug ("ospf_abr_nssa_task(): announce nssa defaults");
1740 *ospf_abr_announce_nssa_defaults (ospf);
1741 * havnt a clue what above is supposed to do.
1742 */
1743
1744 /* Flush any unapproved previous translates from Global Data Base */
1745 if (IS_DEBUG_OSPF_NSSA)
1746 zlog_debug(
1747 "ospf_abr_nssa_task(): remove unapproved translates");
1748 ospf_abr_remove_unapproved_translates(ospf);
1749
1750 ospf_abr_manage_discard_routes(ospf); /* same as normal...discard */
1751
1752 if (IS_DEBUG_OSPF_NSSA)
1753 zlog_debug("ospf_abr_nssa_task(): Stop");
1754 }
1755
1756 /* This is the function taking care about ABR stuff, i.e.
1757 summary-LSA origination and flooding. */
1758 void ospf_abr_task(struct ospf *ospf)
1759 {
1760 if (IS_DEBUG_OSPF_EVENT)
1761 zlog_debug("ospf_abr_task(): Start");
1762
1763 if (ospf->new_table == NULL || ospf->new_rtrs == NULL) {
1764 if (IS_DEBUG_OSPF_EVENT)
1765 zlog_debug(
1766 "ospf_abr_task(): Routing tables are not yet ready");
1767 return;
1768 }
1769
1770 if (IS_DEBUG_OSPF_EVENT)
1771 zlog_debug("ospf_abr_task(): unapprove summaries");
1772 ospf_abr_unapprove_summaries(ospf);
1773
1774 if (IS_DEBUG_OSPF_EVENT)
1775 zlog_debug("ospf_abr_task(): prepare aggregates");
1776 ospf_abr_prepare_aggregates(ospf);
1777
1778 if (IS_OSPF_ABR(ospf)) {
1779 if (IS_DEBUG_OSPF_EVENT)
1780 zlog_debug("ospf_abr_task(): process network RT");
1781 ospf_abr_process_network_rt(ospf, ospf->new_table);
1782
1783 if (IS_DEBUG_OSPF_EVENT)
1784 zlog_debug("ospf_abr_task(): process router RT");
1785 ospf_abr_process_router_rt(ospf, ospf->new_rtrs);
1786
1787 if (IS_DEBUG_OSPF_EVENT)
1788 zlog_debug("ospf_abr_task(): announce aggregates");
1789 ospf_abr_announce_aggregates(ospf);
1790
1791 if (IS_DEBUG_OSPF_EVENT)
1792 zlog_debug("ospf_abr_task(): announce stub defaults");
1793 ospf_abr_announce_stub_defaults(ospf);
1794 }
1795
1796 if (IS_DEBUG_OSPF_EVENT)
1797 zlog_debug("ospf_abr_task(): remove unapproved summaries");
1798 ospf_abr_remove_unapproved_summaries(ospf);
1799
1800 ospf_abr_manage_discard_routes(ospf);
1801
1802 if (IS_DEBUG_OSPF_EVENT)
1803 zlog_debug("ospf_abr_task(): Stop");
1804 }
1805
1806 static int ospf_abr_task_timer(struct thread *thread)
1807 {
1808 struct ospf *ospf = THREAD_ARG(thread);
1809
1810 ospf->t_abr_task = 0;
1811
1812 if (IS_DEBUG_OSPF_EVENT)
1813 zlog_debug("Running ABR task on timer");
1814
1815 ospf_check_abr_status(ospf);
1816 ospf_abr_nssa_check_status(ospf);
1817
1818 ospf_abr_task(ospf);
1819 ospf_abr_nssa_task(ospf); /* if nssa-abr, then scan Type-7 LSDB */
1820 ospf_asbr_nssa_redist_task(ospf);
1821
1822 return 0;
1823 }
1824
1825 void ospf_schedule_abr_task(struct ospf *ospf)
1826 {
1827 if (IS_DEBUG_OSPF_EVENT)
1828 zlog_debug("Scheduling ABR task");
1829
1830 thread_add_timer(master, ospf_abr_task_timer, ospf, OSPF_ABR_TASK_DELAY,
1831 &ospf->t_abr_task);
1832 }
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