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1 /*
2 * OSPF Flooding -- RFC2328 Section 13.
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 "monotime.h"
25 #include "linklist.h"
26 #include "prefix.h"
27 #include "if.h"
28 #include "command.h"
29 #include "table.h"
30 #include "thread.h"
31 #include "memory.h"
32 #include "log.h"
33 #include "zclient.h"
34
35 #include "ospfd/ospfd.h"
36 #include "ospfd/ospf_interface.h"
37 #include "ospfd/ospf_ism.h"
38 #include "ospfd/ospf_asbr.h"
39 #include "ospfd/ospf_lsa.h"
40 #include "ospfd/ospf_lsdb.h"
41 #include "ospfd/ospf_neighbor.h"
42 #include "ospfd/ospf_nsm.h"
43 #include "ospfd/ospf_spf.h"
44 #include "ospfd/ospf_flood.h"
45 #include "ospfd/ospf_packet.h"
46 #include "ospfd/ospf_abr.h"
47 #include "ospfd/ospf_route.h"
48 #include "ospfd/ospf_zebra.h"
49 #include "ospfd/ospf_dump.h"
50
51 extern struct zclient *zclient;
52
53 /* Do the LSA acking specified in table 19, Section 13.5, row 2
54 * This get called from ospf_flood_out_interface. Declared inline
55 * for speed. */
56 static void ospf_flood_delayed_lsa_ack(struct ospf_neighbor *inbr,
57 struct ospf_lsa *lsa)
58 {
59 /* LSA is more recent than database copy, but was not
60 flooded back out receiving interface. Delayed
61 acknowledgment sent. If interface is in Backup state
62 delayed acknowledgment sent only if advertisement
63 received from Designated Router, otherwise do nothing See
64 RFC 2328 Section 13.5 */
65
66 /* Whether LSA is more recent or not, and whether this is in
67 response to the LSA being sent out recieving interface has been
68 worked out previously */
69
70 /* Deal with router as BDR */
71 if (inbr->oi->state == ISM_Backup && !NBR_IS_DR(inbr))
72 return;
73
74 /* Schedule a delayed LSA Ack to be sent */
75 listnode_add(inbr->oi->ls_ack,
76 ospf_lsa_lock(lsa)); /* delayed LSA Ack */
77 }
78
79 /* Check LSA is related to external info. */
80 struct external_info *ospf_external_info_check(struct ospf *ospf,
81 struct ospf_lsa *lsa)
82 {
83 struct as_external_lsa *al;
84 struct prefix_ipv4 p;
85 struct route_node *rn;
86 struct list *ext_list;
87 struct listnode *node;
88 struct ospf_external *ext;
89 int type;
90
91 al = (struct as_external_lsa *)lsa->data;
92
93 p.family = AF_INET;
94 p.prefix = lsa->data->id;
95 p.prefixlen = ip_masklen(al->mask);
96
97 for (type = 0; type < ZEBRA_ROUTE_MAX; type++) {
98 int redist_on = 0;
99
100 redist_on =
101 is_prefix_default(&p)
102 ? vrf_bitmap_check(
103 zclient->default_information[AFI_IP],
104 ospf->vrf_id)
105 : (zclient->mi_redist[AFI_IP][type].enabled
106 || vrf_bitmap_check(
107 zclient->redist[AFI_IP][type],
108 ospf->vrf_id));
109 // Pending: check for MI above.
110 if (redist_on) {
111 ext_list = ospf->external[type];
112 if (!ext_list)
113 continue;
114
115 for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) {
116 rn = NULL;
117 if (ext->external_info)
118 rn = route_node_lookup(
119 ext->external_info,
120 (struct prefix *)&p);
121 if (rn) {
122 route_unlock_node(rn);
123 if (rn->info != NULL)
124 return (struct external_info *)
125 rn->info;
126 }
127 }
128 }
129 }
130
131 if (is_prefix_default(&p) && ospf->external[DEFAULT_ROUTE]) {
132 ext_list = ospf->external[DEFAULT_ROUTE];
133
134 for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) {
135 if (!ext->external_info)
136 continue;
137
138 rn = route_node_lookup(ext->external_info,
139 (struct prefix *)&p);
140 if (!rn)
141 continue;
142 route_unlock_node(rn);
143 if (rn->info != NULL)
144 return (struct external_info *)rn->info;
145 }
146 }
147 return NULL;
148 }
149
150 static void ospf_process_self_originated_lsa(struct ospf *ospf,
151 struct ospf_lsa *new,
152 struct ospf_area *area)
153 {
154 struct ospf_interface *oi;
155 struct external_info *ei;
156 struct listnode *node;
157 struct as_external_lsa *al;
158 struct prefix_ipv4 p;
159 struct ospf_external_aggr_rt *aggr;
160
161 if (IS_DEBUG_OSPF_EVENT)
162 zlog_debug(
163 "%s:LSA[Type%d:%pI4]: Process self-originated LSA seq 0x%x",
164 ospf_get_name(ospf), new->data->type,
165 &new->data->id, ntohl(new->data->ls_seqnum));
166
167 /* If we're here, we installed a self-originated LSA that we received
168 from a neighbor, i.e. it's more recent. We must see whether we want
169 to originate it.
170 If yes, we should use this LSA's sequence number and reoriginate
171 a new instance.
172 if not --- we must flush this LSA from the domain. */
173 switch (new->data->type) {
174 case OSPF_ROUTER_LSA:
175 /* Originate a new instance and schedule flooding */
176 if (area->router_lsa_self)
177 area->router_lsa_self->data->ls_seqnum =
178 new->data->ls_seqnum;
179 ospf_router_lsa_update_area(area);
180 return;
181 case OSPF_NETWORK_LSA:
182 case OSPF_OPAQUE_LINK_LSA:
183 /* We must find the interface the LSA could belong to.
184 If the interface is no more a broadcast type or we are no
185 more
186 the DR, we flush the LSA otherwise -- create the new instance
187 and
188 schedule flooding. */
189
190 /* Look through all interfaces, not just area, since interface
191 could be moved from one area to another. */
192 for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi))
193 /* These are sanity check. */
194 if (IPV4_ADDR_SAME(&oi->address->u.prefix4,
195 &new->data->id)) {
196 if (oi->area != area
197 || oi->type != OSPF_IFTYPE_BROADCAST
198 || !IPV4_ADDR_SAME(&oi->address->u.prefix4,
199 &DR(oi))) {
200 ospf_schedule_lsa_flush_area(area, new);
201 return;
202 }
203
204 if (new->data->type == OSPF_OPAQUE_LINK_LSA) {
205 ospf_opaque_lsa_refresh(new);
206 return;
207 }
208
209 if (oi->network_lsa_self)
210 oi->network_lsa_self->data->ls_seqnum =
211 new->data->ls_seqnum;
212 /* Schedule network-LSA origination. */
213 ospf_network_lsa_update(oi);
214 return;
215 }
216 break;
217 case OSPF_SUMMARY_LSA:
218 case OSPF_ASBR_SUMMARY_LSA:
219 ospf_schedule_abr_task(ospf);
220 break;
221 case OSPF_AS_EXTERNAL_LSA:
222 case OSPF_AS_NSSA_LSA:
223 if ((new->data->type == OSPF_AS_EXTERNAL_LSA)
224 && CHECK_FLAG(new->flags, OSPF_LSA_LOCAL_XLT)) {
225 ospf_translated_nssa_refresh(ospf, NULL, new);
226 return;
227 }
228
229 al = (struct as_external_lsa *)new->data;
230 p.family = AF_INET;
231 p.prefixlen = ip_masklen(al->mask);
232 p.prefix = new->data->id;
233
234 ei = ospf_external_info_check(ospf, new);
235 if (ei) {
236 if (ospf_external_aggr_match(ospf, &ei->p)) {
237 if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
238 zlog_debug(
239 "%s, Matching external aggregate route found for %pI4, so don't refresh it.",
240 __func__,
241 &ei->p.prefix);
242
243 /* Aggregated external route shouldn't
244 * be in LSDB.
245 */
246 if (!IS_LSA_MAXAGE(new))
247 ospf_lsa_flush_as(ospf, new);
248
249 return;
250 }
251
252 ospf_external_lsa_refresh(ospf, new, ei,
253 LSA_REFRESH_FORCE, false);
254 } else {
255 aggr = (struct ospf_external_aggr_rt *)
256 ospf_extrenal_aggregator_lookup(ospf, &p);
257 if (aggr) {
258 struct external_info ei_aggr;
259
260 memset(&ei_aggr, 0,
261 sizeof(struct external_info));
262 ei_aggr.p = aggr->p;
263 ei_aggr.tag = aggr->tag;
264 ei_aggr.instance = ospf->instance;
265 ei_aggr.route_map_set.metric = -1;
266 ei_aggr.route_map_set.metric_type = -1;
267
268 ospf_external_lsa_refresh(ospf, new, &ei_aggr,
269 LSA_REFRESH_FORCE, true);
270 } else
271 ospf_lsa_flush_as(ospf, new);
272 }
273 break;
274 case OSPF_OPAQUE_AREA_LSA:
275 ospf_opaque_lsa_refresh(new);
276 break;
277 case OSPF_OPAQUE_AS_LSA:
278 ospf_opaque_lsa_refresh(new);
279 /* Reconsideration may needed. */ /* XXX */
280 break;
281 default:
282 break;
283 }
284 }
285
286 /* OSPF LSA flooding -- RFC2328 Section 13.(5). */
287
288 /* Now Updated for NSSA operation, as follows:
289
290
291 Type-5's have no change. Blocked to STUB or NSSA.
292
293 Type-7's can be received, and if a DR
294 they will also flood the local NSSA Area as Type-7's
295
296 If a Self-Originated LSA (now an ASBR),
297 The LSDB will be updated as Type-5's, (for continual re-fresh)
298
299 If an NSSA-IR it is installed/flooded as Type-7, P-bit on.
300 if an NSSA-ABR it is installed/flooded as Type-7, P-bit off.
301
302 Later, during the ABR TASK, if the ABR is the Elected NSSA
303 translator, then All Type-7s (with P-bit ON) are Translated to
304 Type-5's and flooded to all non-NSSA/STUB areas.
305
306 During ASE Calculations,
307 non-ABRs calculate external routes from Type-7's
308 ABRs calculate external routes from Type-5's and non-self Type-7s
309 */
310 int ospf_flood(struct ospf *ospf, struct ospf_neighbor *nbr,
311 struct ospf_lsa *current, struct ospf_lsa *new)
312 {
313 struct ospf_interface *oi;
314 int lsa_ack_flag;
315
316 /* Type-7 LSA's will be flooded throughout their native NSSA area,
317 but will also be flooded as Type-5's into ABR capable links. */
318
319 if (IS_DEBUG_OSPF_EVENT)
320 zlog_debug(
321 "%s:LSA[Flooding]: start, NBR %pI4 (%s), cur(%p), New-LSA[%s]",
322 ospf_get_name(ospf), &nbr->router_id,
323 lookup_msg(ospf_nsm_state_msg, nbr->state, NULL),
324 (void *)current, dump_lsa_key(new));
325
326 oi = nbr->oi;
327
328 /* If there is already a database copy, and if the
329 database copy was received via flooding and installed less
330 than MinLSArrival seconds ago, discard the new LSA
331 (without acknowledging it). */
332 if (current != NULL) /* -- endo. */
333 {
334 if (IS_LSA_SELF(current)
335 && (ntohs(current->data->ls_age) == 0
336 && ntohl(current->data->ls_seqnum)
337 == OSPF_INITIAL_SEQUENCE_NUMBER)) {
338 if (IS_DEBUG_OSPF_EVENT)
339 zlog_debug(
340 "%s:LSA[Flooding]: Got a self-originated LSA, while local one is initial instance.",
341 ospf_get_name(ospf));
342 ; /* Accept this LSA for quick LSDB resynchronization.
343 */
344 } else if (monotime_since(&current->tv_recv, NULL)
345 < ospf->min_ls_arrival * 1000LL) {
346 if (IS_DEBUG_OSPF_EVENT)
347 zlog_debug(
348 "%s:LSA[Flooding]: LSA is received recently.",
349 ospf_get_name(ospf));
350 return -1;
351 }
352 }
353
354 /* Flood the new LSA out some subset of the router's interfaces.
355 In some cases (e.g., the state of the receiving interface is
356 DR and the LSA was received from a router other than the
357 Backup DR) the LSA will be flooded back out the receiving
358 interface. */
359 lsa_ack_flag = ospf_flood_through(ospf, nbr, new);
360
361 /* Remove the current database copy from all neighbors' Link state
362 retransmission lists. AS_EXTERNAL and AS_EXTERNAL_OPAQUE does
363 ^^^^^^^^^^^^^^^^^^^^^^^
364 not have area ID.
365 All other (even NSSA's) do have area ID. */
366 if (current) {
367 switch (current->data->type) {
368 case OSPF_AS_EXTERNAL_LSA:
369 case OSPF_OPAQUE_AS_LSA:
370 ospf_ls_retransmit_delete_nbr_as(ospf, current);
371 break;
372 default:
373 ospf_ls_retransmit_delete_nbr_area(oi->area, current);
374 break;
375 }
376 }
377
378 /* Do some internal house keeping that is needed here */
379 SET_FLAG(new->flags, OSPF_LSA_RECEIVED);
380 (void)ospf_lsa_is_self_originated(ospf, new); /* Let it set the flag */
381
382 /* Received Grace LSA */
383 if (IS_GRACE_LSA(new)) {
384
385 if (IS_LSA_MAXAGE(new)) {
386
387 /* Handling Max age grace LSA.*/
388 if (IS_DEBUG_OSPF_GR_HELPER)
389 zlog_debug(
390 "%s, Received a maxage GRACE-LSA from router %pI4",
391 __func__, &new->data->adv_router);
392
393 if (current) {
394 ospf_process_maxage_grace_lsa(ospf, new, nbr);
395 } else {
396 if (IS_DEBUG_OSPF_GR_HELPER)
397 zlog_debug(
398 "%s, Grace LSA doesn't exist in lsdb, so discarding grace lsa",
399 __func__);
400 return -1;
401 }
402 } else {
403 if (IS_DEBUG_OSPF_GR_HELPER)
404 zlog_debug(
405 "%s, Received a GRACE-LSA from router %pI4",
406 __func__, &new->data->adv_router);
407
408 if (ospf_process_grace_lsa(ospf, new, nbr)
409 == OSPF_GR_NOT_HELPER) {
410 if (IS_DEBUG_OSPF_GR_HELPER)
411 zlog_debug(
412 "%s, Not moving to HELPER role, So discarding grace LSA",
413 __func__);
414 return -1;
415 }
416 }
417 }
418
419 /* Install the new LSA in the link state database
420 (replacing the current database copy). This may cause the
421 routing table calculation to be scheduled. In addition,
422 timestamp the new LSA with the current time. The flooding
423 procedure cannot overwrite the newly installed LSA until
424 MinLSArrival seconds have elapsed. */
425
426 if (!(new = ospf_lsa_install(ospf, oi, new)))
427 return -1; /* unknown LSA type or any other error condition */
428
429 /* Acknowledge the receipt of the LSA by sending a Link State
430 Acknowledgment packet back out the receiving interface. */
431 if (lsa_ack_flag)
432 ospf_flood_delayed_lsa_ack(nbr, new);
433
434 /* If this new LSA indicates that it was originated by the
435 receiving router itself, the router must take special action,
436 either updating the LSA or in some cases flushing it from
437 the routing domain. */
438 if (ospf_lsa_is_self_originated(ospf, new))
439 ospf_process_self_originated_lsa(ospf, new, oi->area);
440 else
441 /* Update statistics value for OSPF-MIB. */
442 ospf->rx_lsa_count++;
443
444 return 0;
445 }
446
447 /* OSPF LSA flooding -- RFC2328 Section 13.3. */
448 static int ospf_flood_through_interface(struct ospf_interface *oi,
449 struct ospf_neighbor *inbr,
450 struct ospf_lsa *lsa)
451 {
452 struct ospf_neighbor *onbr;
453 struct route_node *rn;
454 int retx_flag;
455 char buf[PREFIX_STRLEN];
456
457 if (IS_DEBUG_OSPF_EVENT)
458 zlog_debug(
459 "%s: considering int %s (%s), INBR(%s), LSA[%s] AGE %u",
460 __func__, IF_NAME(oi), ospf_get_name(oi->ospf),
461 inbr ? inet_ntop(AF_INET, &inbr->router_id, buf,
462 sizeof(buf))
463 : "NULL",
464 dump_lsa_key(lsa), ntohs(lsa->data->ls_age));
465
466 if (!ospf_if_is_enable(oi))
467 return 0;
468
469 /* Remember if new LSA is added to a retransmit list. */
470 retx_flag = 0;
471
472 /* Each of the neighbors attached to this interface are examined,
473 to determine whether they must receive the new LSA. The following
474 steps are executed for each neighbor: */
475 for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
476 struct ospf_lsa *ls_req;
477
478 if (rn->info == NULL)
479 continue;
480
481 onbr = rn->info;
482 if (IS_DEBUG_OSPF_EVENT)
483 zlog_debug(
484 "%s: considering nbr %pI4 via %s (%s), state: %s",
485 __func__, &onbr->router_id, IF_NAME(oi),
486 ospf_get_name(oi->ospf),
487 lookup_msg(ospf_nsm_state_msg, onbr->state,
488 NULL));
489
490 /* If the neighbor is in a lesser state than Exchange, it
491 does not participate in flooding, and the next neighbor
492 should be examined. */
493 if (onbr->state < NSM_Exchange)
494 continue;
495
496 /* If the adjacency is not yet full (neighbor state is
497 Exchange or Loading), examine the Link state request
498 list associated with this adjacency. If there is an
499 instance of the new LSA on the list, it indicates that
500 the neighboring router has an instance of the LSA
501 already. Compare the new LSA to the neighbor's copy: */
502 if (onbr->state < NSM_Full) {
503 if (IS_DEBUG_OSPF_EVENT)
504 zlog_debug(
505 "%s: adj to onbr %pI4 is not Full (%s)",
506 __func__, &onbr->router_id,
507 lookup_msg(ospf_nsm_state_msg,
508 onbr->state, NULL));
509 ls_req = ospf_ls_request_lookup(onbr, lsa);
510 if (ls_req != NULL) {
511 int ret;
512
513 ret = ospf_lsa_more_recent(ls_req, lsa);
514 /* The new LSA is less recent. */
515 if (ret > 0)
516 continue;
517 /* The two copies are the same instance, then
518 delete
519 the LSA from the Link state request list. */
520 else if (ret == 0) {
521 ospf_ls_request_delete(onbr, ls_req);
522 ospf_check_nbr_loading(onbr);
523 continue;
524 }
525 /* The new LSA is more recent. Delete the LSA
526 from the Link state request list. */
527 else {
528 ospf_ls_request_delete(onbr, ls_req);
529 ospf_check_nbr_loading(onbr);
530 }
531 }
532 }
533
534 if (IS_OPAQUE_LSA(lsa->data->type)) {
535 if (!CHECK_FLAG(onbr->options, OSPF_OPTION_O)) {
536 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
537 zlog_debug(
538 "%s: Skipping neighbor %s via %pI4 -- Not Opaque-capable.",
539 __func__, IF_NAME(oi),
540 &onbr->router_id);
541 continue;
542 }
543 }
544
545 /* If the new LSA was received from this neighbor,
546 examine the next neighbor. */
547 if (inbr) {
548 /*
549 * Triggered by LSUpd message parser "ospf_ls_upd ()".
550 * E.g., all LSAs handling here is received via network.
551 */
552 if (IPV4_ADDR_SAME(&inbr->router_id,
553 &onbr->router_id)) {
554 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
555 zlog_debug(
556 "%s: Skipping neighbor %s via %pI4 -- inbr == onbr.",
557 __func__, IF_NAME(oi),
558 &inbr->router_id);
559 continue;
560 }
561 } else {
562 /*
563 * Triggered by MaxAge remover, so far.
564 * NULL "inbr" means flooding starts from this node.
565 */
566 if (IPV4_ADDR_SAME(&lsa->data->adv_router,
567 &onbr->router_id)) {
568 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
569 zlog_debug(
570 "%s: Skipping neighbor %s via %pI4 -- lsah->adv_router == onbr.",
571 __func__, IF_NAME(oi),
572 &onbr->router_id);
573 continue;
574 }
575 }
576
577 /* Add the new LSA to the Link state retransmission list
578 for the adjacency. The LSA will be retransmitted
579 at intervals until an acknowledgment is seen from
580 the neighbor. */
581 ospf_ls_retransmit_add(onbr, lsa);
582 retx_flag = 1;
583 }
584
585 /* If in the previous step, the LSA was NOT added to any of
586 the Link state retransmission lists, there is no need to
587 flood the LSA out the interface. */
588 if (retx_flag == 0) {
589 return (inbr && inbr->oi == oi);
590 }
591
592 /* if we've received the lsa on this interface we need to perform
593 additional checking */
594 if (inbr && (inbr->oi == oi)) {
595 /* If the new LSA was received on this interface, and it was
596 received from either the Designated Router or the Backup
597 Designated Router, chances are that all the neighbors have
598 received the LSA already. */
599 if (NBR_IS_DR(inbr) || NBR_IS_BDR(inbr)) {
600 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
601 zlog_debug("%s: DR/BDR NOT SEND to int %s (%s)",
602 __func__, IF_NAME(oi),
603 ospf_get_name(oi->ospf));
604 return 1;
605 }
606
607 /* If the new LSA was received on this interface, and the
608 interface state is Backup, examine the next interface. The
609 Designated Router will do the flooding on this interface.
610 However, if the Designated Router fails the router will
611 end up retransmitting the updates. */
612
613 if (oi->state == ISM_Backup) {
614 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
615 zlog_debug(
616 "%s: ISM_Backup NOT SEND to int %s (%s)",
617 __func__, IF_NAME(oi),
618 ospf_get_name(oi->ospf));
619 return 1;
620 }
621 }
622
623 /* The LSA must be flooded out the interface. Send a Link State
624 Update packet (including the new LSA as contents) out the
625 interface. The LSA's LS age must be incremented by InfTransDelay
626 (which must be > 0) when it is copied into the outgoing Link
627 State Update packet (until the LS age field reaches the maximum
628 value of MaxAge). */
629 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
630 zlog_debug("%s: DR/BDR sending upd to int %s (%s)", __func__,
631 IF_NAME(oi), ospf_get_name(oi->ospf));
632
633 /* RFC2328 Section 13.3
634 On non-broadcast networks, separate Link State Update
635 packets must be sent, as unicasts, to each adjacent neighbor
636 (i.e., those in state Exchange or greater). The destination
637 IP addresses for these packets are the neighbors' IP
638 addresses. */
639 if (oi->type == OSPF_IFTYPE_NBMA) {
640 struct ospf_neighbor *nbr;
641
642 for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
643 if ((nbr = rn->info) != NULL)
644 if (nbr != oi->nbr_self
645 && nbr->state >= NSM_Exchange)
646 ospf_ls_upd_send_lsa(
647 nbr, lsa,
648 OSPF_SEND_PACKET_DIRECT);
649 } else
650 ospf_ls_upd_send_lsa(oi->nbr_self, lsa,
651 OSPF_SEND_PACKET_INDIRECT);
652
653 return 0;
654 }
655
656 int ospf_flood_through_area(struct ospf_area *area, struct ospf_neighbor *inbr,
657 struct ospf_lsa *lsa)
658 {
659 struct listnode *node, *nnode;
660 struct ospf_interface *oi;
661 int lsa_ack_flag = 0;
662
663 assert(area);
664 /* All other types are specific to a single area (Area A). The
665 eligible interfaces are all those interfaces attaching to the
666 Area A. If Area A is the backbone, this includes all the virtual
667 links. */
668 for (ALL_LIST_ELEMENTS(area->oiflist, node, nnode, oi)) {
669 if (area->area_id.s_addr != OSPF_AREA_BACKBONE
670 && oi->type == OSPF_IFTYPE_VIRTUALLINK)
671 continue;
672
673 if ((lsa->data->type == OSPF_OPAQUE_LINK_LSA)
674 && (lsa->oi != oi)) {
675 /*
676 * Link local scoped Opaque-LSA should only be flooded
677 * for the link on which the LSA has received.
678 */
679 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
680 zlog_debug(
681 "Type-9 Opaque-LSA: lsa->oi(%p) != oi(%p)",
682 (void *)lsa->oi, (void *)oi);
683 continue;
684 }
685
686 if (ospf_flood_through_interface(oi, inbr, lsa))
687 lsa_ack_flag = 1;
688 }
689
690 return (lsa_ack_flag);
691 }
692
693 int ospf_flood_through_as(struct ospf *ospf, struct ospf_neighbor *inbr,
694 struct ospf_lsa *lsa)
695 {
696 struct listnode *node;
697 struct ospf_area *area;
698 int lsa_ack_flag;
699
700 lsa_ack_flag = 0;
701
702 /* The incoming LSA is type 5 or type 7 (AS-EXTERNAL or AS-NSSA )
703
704 Divert the Type-5 LSA's to all non-NSSA/STUB areas
705
706 Divert the Type-7 LSA's to all NSSA areas
707
708 AS-external-LSAs are flooded throughout the entire AS, with the
709 exception of stub areas (see Section 3.6). The eligible
710 interfaces are all the router's interfaces, excluding virtual
711 links and those interfaces attaching to stub areas. */
712
713 if (CHECK_FLAG(lsa->flags, OSPF_LSA_LOCAL_XLT)) /* Translated from 7 */
714 if (IS_DEBUG_OSPF_NSSA)
715 zlog_debug("Flood/AS: NSSA TRANSLATED LSA");
716
717 for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
718 int continue_flag = 0;
719 struct listnode *if_node;
720 struct ospf_interface *oi;
721
722 switch (area->external_routing) {
723 /* Don't send AS externals into stub areas. Various types
724 of support for partial stub areas can be implemented
725 here. NSSA's will receive Type-7's that have areas
726 matching the originl LSA. */
727 case OSPF_AREA_NSSA: /* Sending Type 5 or 7 into NSSA area */
728 /* Type-7, flood NSSA area */
729 if (lsa->data->type == OSPF_AS_NSSA_LSA
730 && area == lsa->area)
731 /* We will send it. */
732 continue_flag = 0;
733 else
734 continue_flag = 1; /* Skip this NSSA area for
735 Type-5's et al */
736 break;
737
738 case OSPF_AREA_TYPE_MAX:
739 case OSPF_AREA_STUB:
740 continue_flag = 1; /* Skip this area. */
741 break;
742
743 case OSPF_AREA_DEFAULT:
744 default:
745 /* No Type-7 into normal area */
746 if (lsa->data->type == OSPF_AS_NSSA_LSA)
747 continue_flag = 1; /* skip Type-7 */
748 else
749 continue_flag = 0; /* Do this area. */
750 break;
751 }
752
753 /* Do continue for above switch. Saves a big if then mess */
754 if (continue_flag)
755 continue; /* main for-loop */
756
757 /* send to every interface in this area */
758
759 for (ALL_LIST_ELEMENTS_RO(area->oiflist, if_node, oi)) {
760 /* Skip virtual links */
761 if (oi->type != OSPF_IFTYPE_VIRTUALLINK)
762 if (ospf_flood_through_interface(oi, inbr,
763 lsa)) /* lsa */
764 lsa_ack_flag = 1;
765 }
766 } /* main area for-loop */
767
768 return (lsa_ack_flag);
769 }
770
771 int ospf_flood_through(struct ospf *ospf, struct ospf_neighbor *inbr,
772 struct ospf_lsa *lsa)
773 {
774 int lsa_ack_flag = 0;
775
776 /* Type-7 LSA's for NSSA are flooded throughout the AS here, and
777 upon return are updated in the LSDB for Type-7's. Later,
778 re-fresh will re-send them (and also, if ABR, packet code will
779 translate to Type-5's)
780
781 As usual, Type-5 LSA's (if not DISCARDED because we are STUB or
782 NSSA) are flooded throughout the AS, and are updated in the
783 global table. */
784 /*
785 * At the common sub-sub-function "ospf_flood_through_interface()",
786 * a parameter "inbr" will be used to distinguish the called context
787 * whether the given LSA was received from the neighbor, or the
788 * flooding for the LSA starts from this node (e.g. the LSA was self-
789 * originated, or the LSA is going to be flushed from routing domain).
790 *
791 * So, for consistency reasons, this function "ospf_flood_through()"
792 * should also allow the usage that the given "inbr" parameter to be
793 * NULL. If we do so, corresponding AREA parameter should be referred
794 * by "lsa->area", instead of "inbr->oi->area".
795 */
796 switch (lsa->data->type) {
797 case OSPF_AS_EXTERNAL_LSA: /* Type-5 */
798 case OSPF_OPAQUE_AS_LSA:
799 lsa_ack_flag = ospf_flood_through_as(ospf, inbr, lsa);
800 break;
801 /* Type-7 Only received within NSSA, then flooded */
802 case OSPF_AS_NSSA_LSA:
803 /* Any P-bit was installed with the Type-7. */
804
805 if (IS_DEBUG_OSPF_NSSA)
806 zlog_debug(
807 "ospf_flood_through: LOCAL NSSA FLOOD of Type-7.");
808 /* Fallthrough */
809 default:
810 lsa_ack_flag = ospf_flood_through_area(lsa->area, inbr, lsa);
811 break;
812 }
813
814 return (lsa_ack_flag);
815 }
816
817
818 /* Management functions for neighbor's Link State Request list. */
819 void ospf_ls_request_add(struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
820 {
821 /*
822 * We cannot make use of the newly introduced callback function
823 * "lsdb->new_lsa_hook" to replace debug output below, just because
824 * it seems no simple and smart way to pass neighbor information to
825 * the common function "ospf_lsdb_add()" -- endo.
826 */
827 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
828 zlog_debug("RqstL(%lu)++, NBR(%pI4(%s)), LSA[%s]",
829 ospf_ls_request_count(nbr),
830 &nbr->router_id,
831 ospf_get_name(nbr->oi->ospf), dump_lsa_key(lsa));
832
833 ospf_lsdb_add(&nbr->ls_req, lsa);
834 }
835
836 unsigned long ospf_ls_request_count(struct ospf_neighbor *nbr)
837 {
838 return ospf_lsdb_count_all(&nbr->ls_req);
839 }
840
841 int ospf_ls_request_isempty(struct ospf_neighbor *nbr)
842 {
843 return ospf_lsdb_isempty(&nbr->ls_req);
844 }
845
846 /* Remove LSA from neighbor's ls-request list. */
847 void ospf_ls_request_delete(struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
848 {
849 if (nbr->ls_req_last == lsa) {
850 ospf_lsa_unlock(&nbr->ls_req_last);
851 nbr->ls_req_last = NULL;
852 }
853
854 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) /* -- endo. */
855 zlog_debug("RqstL(%lu)--, NBR(%pI4(%s)), LSA[%s]",
856 ospf_ls_request_count(nbr),
857 &nbr->router_id,
858 ospf_get_name(nbr->oi->ospf), dump_lsa_key(lsa));
859
860 ospf_lsdb_delete(&nbr->ls_req, lsa);
861 }
862
863 /* Remove all LSA from neighbor's ls-requenst list. */
864 void ospf_ls_request_delete_all(struct ospf_neighbor *nbr)
865 {
866 ospf_lsa_unlock(&nbr->ls_req_last);
867 nbr->ls_req_last = NULL;
868 ospf_lsdb_delete_all(&nbr->ls_req);
869 }
870
871 /* Lookup LSA from neighbor's ls-request list. */
872 struct ospf_lsa *ospf_ls_request_lookup(struct ospf_neighbor *nbr,
873 struct ospf_lsa *lsa)
874 {
875 return ospf_lsdb_lookup(&nbr->ls_req, lsa);
876 }
877
878 struct ospf_lsa *ospf_ls_request_new(struct lsa_header *lsah)
879 {
880 struct ospf_lsa *new;
881
882 new = ospf_lsa_new_and_data(OSPF_LSA_HEADER_SIZE);
883 memcpy(new->data, lsah, OSPF_LSA_HEADER_SIZE);
884
885 return new;
886 }
887
888
889 /* Management functions for neighbor's ls-retransmit list. */
890 unsigned long ospf_ls_retransmit_count(struct ospf_neighbor *nbr)
891 {
892 return ospf_lsdb_count_all(&nbr->ls_rxmt);
893 }
894
895 unsigned long ospf_ls_retransmit_count_self(struct ospf_neighbor *nbr,
896 int lsa_type)
897 {
898 return ospf_lsdb_count_self(&nbr->ls_rxmt, lsa_type);
899 }
900
901 int ospf_ls_retransmit_isempty(struct ospf_neighbor *nbr)
902 {
903 return ospf_lsdb_isempty(&nbr->ls_rxmt);
904 }
905
906 /* Add LSA to be retransmitted to neighbor's ls-retransmit list. */
907 void ospf_ls_retransmit_add(struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
908 {
909 struct ospf_lsa *old;
910
911 old = ospf_ls_retransmit_lookup(nbr, lsa);
912
913 if (ospf_lsa_more_recent(old, lsa) < 0) {
914 if (old) {
915 old->retransmit_counter--;
916 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
917 zlog_debug("RXmtL(%lu)--, NBR(%pI4(%s)), LSA[%s]",
918 ospf_ls_retransmit_count(nbr),
919 &nbr->router_id,
920 ospf_get_name(nbr->oi->ospf),
921 dump_lsa_key(old));
922 ospf_lsdb_delete(&nbr->ls_rxmt, old);
923 }
924 lsa->retransmit_counter++;
925 /*
926 * We cannot make use of the newly introduced callback function
927 * "lsdb->new_lsa_hook" to replace debug output below, just
928 * because
929 * it seems no simple and smart way to pass neighbor information
930 * to
931 * the common function "ospf_lsdb_add()" -- endo.
932 */
933 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING))
934 zlog_debug("RXmtL(%lu)++, NBR(%pI4(%s)), LSA[%s]",
935 ospf_ls_retransmit_count(nbr),
936 &nbr->router_id,
937 ospf_get_name(nbr->oi->ospf),
938 dump_lsa_key(lsa));
939 ospf_lsdb_add(&nbr->ls_rxmt, lsa);
940 }
941 }
942
943 /* Remove LSA from neibghbor's ls-retransmit list. */
944 void ospf_ls_retransmit_delete(struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
945 {
946 if (ospf_ls_retransmit_lookup(nbr, lsa)) {
947 lsa->retransmit_counter--;
948 if (IS_DEBUG_OSPF(lsa, LSA_FLOODING)) /* -- endo. */
949 zlog_debug("RXmtL(%lu)--, NBR(%pI4(%s)), LSA[%s]",
950 ospf_ls_retransmit_count(nbr),
951 &nbr->router_id,
952 ospf_get_name(nbr->oi->ospf),
953 dump_lsa_key(lsa));
954 ospf_lsdb_delete(&nbr->ls_rxmt, lsa);
955 }
956 }
957
958 /* Clear neighbor's ls-retransmit list. */
959 void ospf_ls_retransmit_clear(struct ospf_neighbor *nbr)
960 {
961 struct ospf_lsdb *lsdb;
962 int i;
963
964 lsdb = &nbr->ls_rxmt;
965
966 for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) {
967 struct route_table *table = lsdb->type[i].db;
968 struct route_node *rn;
969 struct ospf_lsa *lsa;
970
971 for (rn = route_top(table); rn; rn = route_next(rn))
972 if ((lsa = rn->info) != NULL)
973 ospf_ls_retransmit_delete(nbr, lsa);
974 }
975
976 ospf_lsa_unlock(&nbr->ls_req_last);
977 nbr->ls_req_last = NULL;
978 }
979
980 /* Lookup LSA from neighbor's ls-retransmit list. */
981 struct ospf_lsa *ospf_ls_retransmit_lookup(struct ospf_neighbor *nbr,
982 struct ospf_lsa *lsa)
983 {
984 return ospf_lsdb_lookup(&nbr->ls_rxmt, lsa);
985 }
986
987 static void ospf_ls_retransmit_delete_nbr_if(struct ospf_interface *oi,
988 struct ospf_lsa *lsa)
989 {
990 struct route_node *rn;
991 struct ospf_neighbor *nbr;
992 struct ospf_lsa *lsr;
993
994 if (ospf_if_is_enable(oi))
995 for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
996 /* If LSA find in LS-retransmit list, then remove it. */
997 if ((nbr = rn->info) != NULL) {
998 lsr = ospf_ls_retransmit_lookup(nbr, lsa);
999
1000 /* If LSA find in ls-retransmit list, remove it.
1001 */
1002 if (lsr != NULL
1003 && lsr->data->ls_seqnum
1004 == lsa->data->ls_seqnum)
1005 ospf_ls_retransmit_delete(nbr, lsr);
1006 }
1007 }
1008
1009 void ospf_ls_retransmit_delete_nbr_area(struct ospf_area *area,
1010 struct ospf_lsa *lsa)
1011 {
1012 struct listnode *node, *nnode;
1013 struct ospf_interface *oi;
1014
1015 for (ALL_LIST_ELEMENTS(area->oiflist, node, nnode, oi))
1016 ospf_ls_retransmit_delete_nbr_if(oi, lsa);
1017 }
1018
1019 void ospf_ls_retransmit_delete_nbr_as(struct ospf *ospf, struct ospf_lsa *lsa)
1020 {
1021 struct listnode *node, *nnode;
1022 struct ospf_interface *oi;
1023
1024 for (ALL_LIST_ELEMENTS(ospf->oiflist, node, nnode, oi))
1025 ospf_ls_retransmit_delete_nbr_if(oi, lsa);
1026 }
1027
1028
1029 /* Sets ls_age to MaxAge and floods throu the area.
1030 When we implement ASE routing, there will be another function
1031 flushing an LSA from the whole domain. */
1032 void ospf_lsa_flush_area(struct ospf_lsa *lsa, struct ospf_area *area)
1033 {
1034 /* Reset the lsa origination time such that it gives
1035 more time for the ACK to be received and avoid
1036 retransmissions */
1037 lsa->data->ls_age = htons(OSPF_LSA_MAXAGE);
1038 if (IS_DEBUG_OSPF_EVENT)
1039 zlog_debug("%s: MAXAGE set to LSA %pI4", __func__,
1040 &lsa->data->id);
1041 monotime(&lsa->tv_recv);
1042 lsa->tv_orig = lsa->tv_recv;
1043 ospf_flood_through_area(area, NULL, lsa);
1044 ospf_lsa_maxage(area->ospf, lsa);
1045 }
1046
1047 void ospf_lsa_flush_as(struct ospf *ospf, struct ospf_lsa *lsa)
1048 {
1049 /* Reset the lsa origination time such that it gives
1050 more time for the ACK to be received and avoid
1051 retransmissions */
1052 lsa->data->ls_age = htons(OSPF_LSA_MAXAGE);
1053 monotime(&lsa->tv_recv);
1054 lsa->tv_orig = lsa->tv_recv;
1055 ospf_flood_through_as(ospf, NULL, lsa);
1056 ospf_lsa_maxage(ospf, lsa);
1057 }
1058
1059 void ospf_lsa_flush(struct ospf *ospf, struct ospf_lsa *lsa)
1060 {
1061 lsa->data->ls_age = htons(OSPF_LSA_MAXAGE);
1062
1063 switch (lsa->data->type) {
1064 case OSPF_ROUTER_LSA:
1065 case OSPF_NETWORK_LSA:
1066 case OSPF_SUMMARY_LSA:
1067 case OSPF_ASBR_SUMMARY_LSA:
1068 case OSPF_AS_NSSA_LSA:
1069 case OSPF_OPAQUE_LINK_LSA:
1070 case OSPF_OPAQUE_AREA_LSA:
1071 ospf_lsa_flush_area(lsa, lsa->area);
1072 break;
1073 case OSPF_AS_EXTERNAL_LSA:
1074 case OSPF_OPAQUE_AS_LSA:
1075 ospf_lsa_flush_as(ospf, lsa);
1076 break;
1077 default:
1078 zlog_info("%s: Unknown LSA type %u", __func__, lsa->data->type);
1079 break;
1080 }
1081 }