ospfd: Tighten up the connected check for redistribution
[jleu-quagga.git] / ospfd / ospf_flood.c
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1 /*
2 * OSPF Flooding -- RFC2328 Section 13.
3 * Copyright (C) 1999, 2000 Toshiaki Takada
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.
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.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Zebra; see the file COPYING. If not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
23 #include <zebra.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"
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"
51 extern struct zclient *zclient;
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
57 ospf_flood_delayed_lsa_ack (struct ospf_neighbor *inbr, struct ospf_lsa *lsa)
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 */
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 */
70 /* Deal with router as BDR */
71 if (inbr->oi->state == ISM_Backup && ! NBR_IS_DR (inbr))
72 return;
74 /* Schedule a delayed LSA Ack to be sent */
75 listnode_add (inbr->oi->ls_ack, ospf_lsa_lock (lsa)); /* delayed LSA Ack */
78 /* Check LSA is related to external info. */
79 struct external_info *
80 ospf_external_info_check (struct ospf_lsa *lsa)
82 struct as_external_lsa *al;
83 struct prefix_ipv4 p;
84 struct route_node *rn;
85 int type;
87 al = (struct as_external_lsa *) lsa->data;
89 p.family = AF_INET;
90 p.prefix = lsa->data->id;
91 p.prefixlen = ip_masklen (al->mask);
93 for (type = 0; type <= ZEBRA_ROUTE_MAX; type++)
95 int redist_type = is_prefix_default (&p) ? DEFAULT_ROUTE : type;
96 if (ospf_is_type_redistributed (redist_type))
97 if (EXTERNAL_INFO (type))
99 rn = route_node_lookup (EXTERNAL_INFO (type),
100 (struct prefix *) &p);
101 if (rn)
103 route_unlock_node (rn);
104 if (rn->info != NULL)
105 return (struct external_info *) rn->info;
110 return NULL;
113 static void
114 ospf_process_self_originated_lsa (struct ospf *ospf,
115 struct ospf_lsa *new, struct ospf_area *area)
117 struct ospf_interface *oi;
118 struct external_info *ei;
119 struct listnode *node;
121 if (IS_DEBUG_OSPF_EVENT)
122 zlog_debug ("LSA[Type%d:%s]: Process self-originated LSA seq 0x%x",
123 new->data->type, inet_ntoa (new->data->id),
124 ntohl(new->data->ls_seqnum));
126 /* If we're here, we installed a self-originated LSA that we received
127 from a neighbor, i.e. it's more recent. We must see whether we want
128 to originate it.
129 If yes, we should use this LSA's sequence number and reoriginate
130 a new instance.
131 if not --- we must flush this LSA from the domain. */
132 switch (new->data->type)
134 case OSPF_ROUTER_LSA:
135 /* Originate a new instance and schedule flooding */
136 if (area->router_lsa_self)
137 area->router_lsa_self->data->ls_seqnum = new->data->ls_seqnum;
138 ospf_router_lsa_timer_add (area);
139 return;
140 case OSPF_NETWORK_LSA:
141 #ifdef HAVE_OPAQUE_LSA
142 case OSPF_OPAQUE_LINK_LSA:
143 #endif /* HAVE_OPAQUE_LSA */
144 /* We must find the interface the LSA could belong to.
145 If the interface is no more a broadcast type or we are no more
146 the DR, we flush the LSA otherwise -- create the new instance and
147 schedule flooding. */
149 /* Look through all interfaces, not just area, since interface
150 could be moved from one area to another. */
151 for (ALL_LIST_ELEMENTS_RO (ospf->oiflist, node, oi))
152 /* These are sanity check. */
153 if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &new->data->id))
155 if (oi->area != area ||
156 oi->type != OSPF_IFTYPE_BROADCAST ||
157 !IPV4_ADDR_SAME (&oi->address->u.prefix4, &DR (oi)))
159 ospf_schedule_lsa_flush_area (area, new);
160 return;
163 #ifdef HAVE_OPAQUE_LSA
164 if (new->data->type == OSPF_OPAQUE_LINK_LSA)
166 ospf_opaque_lsa_refresh (new);
167 return;
169 #endif /* HAVE_OPAQUE_LSA */
171 if (oi->network_lsa_self)
172 oi->network_lsa_self->data->ls_seqnum = new->data->ls_seqnum;
173 /* Schedule network-LSA origination. */
174 ospf_network_lsa_timer_add (oi);
175 return;
177 break;
178 case OSPF_SUMMARY_LSA:
179 case OSPF_ASBR_SUMMARY_LSA:
180 ospf_schedule_abr_task (ospf);
181 break;
182 case OSPF_AS_EXTERNAL_LSA :
183 case OSPF_AS_NSSA_LSA:
184 if ( (new->data->type == OSPF_AS_EXTERNAL_LSA)
185 && CHECK_FLAG (new->flags, OSPF_LSA_LOCAL_XLT))
187 ospf_translated_nssa_refresh (ospf, NULL, new);
188 return;
190 ei = ospf_external_info_check (new);
191 if (ei)
192 ospf_external_lsa_refresh (ospf, new, ei, LSA_REFRESH_FORCE);
193 else
194 ospf_lsa_flush_as (ospf, new);
195 break;
196 #ifdef HAVE_OPAQUE_LSA
197 case OSPF_OPAQUE_AREA_LSA:
198 ospf_opaque_lsa_refresh (new);
199 break;
200 case OSPF_OPAQUE_AS_LSA:
201 ospf_opaque_lsa_refresh (new); /* Reconsideration may needed. *//* XXX */
202 break;
203 #endif /* HAVE_OPAQUE_LSA */
204 default:
205 break;
209 /* OSPF LSA flooding -- RFC2328 Section 13.(5). */
211 /* Now Updated for NSSA operation, as follows:
214 Type-5's have no change. Blocked to STUB or NSSA.
216 Type-7's can be received, and if a DR
217 they will also flood the local NSSA Area as Type-7's
219 If a Self-Originated LSA (now an ASBR),
220 The LSDB will be updated as Type-5's, (for continual re-fresh)
222 If an NSSA-IR it is installed/flooded as Type-7, P-bit on.
223 if an NSSA-ABR it is installed/flooded as Type-7, P-bit off.
225 Later, during the ABR TASK, if the ABR is the Elected NSSA
226 translator, then All Type-7s (with P-bit ON) are Translated to
227 Type-5's and flooded to all non-NSSA/STUB areas.
229 During ASE Calculations,
230 non-ABRs calculate external routes from Type-7's
231 ABRs calculate external routes from Type-5's and non-self Type-7s
234 ospf_flood (struct ospf *ospf, struct ospf_neighbor *nbr,
235 struct ospf_lsa *current, struct ospf_lsa *new)
237 struct ospf_interface *oi;
238 int lsa_ack_flag;
240 /* Type-7 LSA's will be flooded throughout their native NSSA area,
241 but will also be flooded as Type-5's into ABR capable links. */
243 if (IS_DEBUG_OSPF_EVENT)
244 zlog_debug ("LSA[Flooding]: start, NBR %s (%s), cur(%p), New-LSA[%s]",
245 inet_ntoa (nbr->router_id),
246 LOOKUP (ospf_nsm_state_msg, nbr->state),
247 current,
248 dump_lsa_key (new));
250 lsa_ack_flag = 0;
251 oi = nbr->oi;
253 /* If there is already a database copy, and if the
254 database copy was received via flooding and installed less
255 than MinLSArrival seconds ago, discard the new LSA
256 (without acknowledging it). */
257 if (current != NULL) /* -- endo. */
259 if (IS_LSA_SELF (current)
260 && (ntohs (current->data->ls_age) == 0
261 && ntohl (current->data->ls_seqnum) == OSPF_INITIAL_SEQUENCE_NUMBER))
263 if (IS_DEBUG_OSPF_EVENT)
264 zlog_debug ("LSA[Flooding]: Got a self-originated LSA, "
265 "while local one is initial instance.");
266 ; /* Accept this LSA for quick LSDB resynchronization. */
268 else if (tv_cmp (tv_sub (recent_relative_time (), current->tv_recv),
269 int2tv (OSPF_MIN_LS_ARRIVAL)) < 0)
271 if (IS_DEBUG_OSPF_EVENT)
272 zlog_debug ("LSA[Flooding]: LSA is received recently.");
273 return -1;
277 /* Flood the new LSA out some subset of the router's interfaces.
278 In some cases (e.g., the state of the receiving interface is
279 DR and the LSA was received from a router other than the
280 Backup DR) the LSA will be flooded back out the receiving
281 interface. */
282 lsa_ack_flag = ospf_flood_through (ospf, nbr, new);
284 #ifdef HAVE_OPAQUE_LSA
285 /* Remove the current database copy from all neighbors' Link state
286 retransmission lists. AS_EXTERNAL and AS_EXTERNAL_OPAQUE does
287 ^^^^^^^^^^^^^^^^^^^^^^^
288 not have area ID.
289 All other (even NSSA's) do have area ID. */
290 #else /* HAVE_OPAQUE_LSA */
291 /* Remove the current database copy from all neighbors' Link state
292 retransmission lists. Only AS_EXTERNAL does not have area ID.
293 All other (even NSSA's) do have area ID. */
294 #endif /* HAVE_OPAQUE_LSA */
295 if (current)
297 switch (current->data->type)
299 case OSPF_AS_EXTERNAL_LSA:
300 #ifdef HAVE_OPAQUE_LSA
301 case OSPF_OPAQUE_AS_LSA:
302 #endif /* HAVE_OPAQUE_LSA */
303 ospf_ls_retransmit_delete_nbr_as (ospf, current);
304 break;
305 default:
306 ospf_ls_retransmit_delete_nbr_area (nbr->oi->area, current);
307 break;
311 /* Do some internal house keeping that is needed here */
312 SET_FLAG (new->flags, OSPF_LSA_RECEIVED);
313 ospf_lsa_is_self_originated (ospf, new); /* Let it set the flag */
315 /* Install the new LSA in the link state database
316 (replacing the current database copy). This may cause the
317 routing table calculation to be scheduled. In addition,
318 timestamp the new LSA with the current time. The flooding
319 procedure cannot overwrite the newly installed LSA until
320 MinLSArrival seconds have elapsed. */
322 new = ospf_lsa_install (ospf, nbr->oi, new);
324 /* Acknowledge the receipt of the LSA by sending a Link State
325 Acknowledgment packet back out the receiving interface. */
326 if (lsa_ack_flag)
327 ospf_flood_delayed_lsa_ack (nbr, new);
329 /* If this new LSA indicates that it was originated by the
330 receiving router itself, the router must take special action,
331 either updating the LSA or in some cases flushing it from
332 the routing domain. */
333 if (ospf_lsa_is_self_originated (ospf, new))
334 ospf_process_self_originated_lsa (ospf, new, oi->area);
335 else
336 /* Update statistics value for OSPF-MIB. */
337 ospf->rx_lsa_count++;
339 return 0;
342 /* OSPF LSA flooding -- RFC2328 Section 13.3. */
343 static int
344 ospf_flood_through_interface (struct ospf_interface *oi,
345 struct ospf_neighbor *inbr,
346 struct ospf_lsa *lsa)
348 struct ospf_neighbor *onbr;
349 struct route_node *rn;
350 int retx_flag;
352 if (IS_DEBUG_OSPF_EVENT)
353 zlog_debug ("ospf_flood_through_interface(): "
354 "considering int %s, INBR(%s), LSA[%s]",
355 IF_NAME (oi), inbr ? inet_ntoa (inbr->router_id) : "NULL",
356 dump_lsa_key (lsa));
358 if (!ospf_if_is_enable (oi))
359 return 0;
361 /* Remember if new LSA is aded to a retransmit list. */
362 retx_flag = 0;
364 /* Each of the neighbors attached to this interface are examined,
365 to determine whether they must receive the new LSA. The following
366 steps are executed for each neighbor: */
367 for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
369 struct ospf_lsa *ls_req;
371 if (rn->info == NULL)
372 continue;
374 onbr = rn->info;
375 if (IS_DEBUG_OSPF_EVENT)
376 zlog_debug ("ospf_flood_through_interface(): considering nbr %s (%s)",
377 inet_ntoa (onbr->router_id),
378 LOOKUP (ospf_nsm_state_msg, onbr->state));
380 /* If the neighbor is in a lesser state than Exchange, it
381 does not participate in flooding, and the next neighbor
382 should be examined. */
383 if (onbr->state < NSM_Exchange)
384 continue;
386 /* If the adjacency is not yet full (neighbor state is
387 Exchange or Loading), examine the Link state request
388 list associated with this adjacency. If there is an
389 instance of the new LSA on the list, it indicates that
390 the neighboring router has an instance of the LSA
391 already. Compare the new LSA to the neighbor's copy: */
392 if (onbr->state < NSM_Full)
394 if (IS_DEBUG_OSPF_EVENT)
395 zlog_debug ("ospf_flood_through_interface(): nbr adj is not Full");
396 ls_req = ospf_ls_request_lookup (onbr, lsa);
397 if (ls_req != NULL)
399 int ret;
401 ret = ospf_lsa_more_recent (ls_req, lsa);
402 /* The new LSA is less recent. */
403 if (ret > 0)
404 continue;
405 /* The two copies are the same instance, then delete
406 the LSA from the Link state request list. */
407 else if (ret == 0)
409 ospf_ls_request_delete (onbr, ls_req);
410 ospf_check_nbr_loading (onbr);
411 continue;
413 /* The new LSA is more recent. Delete the LSA
414 from the Link state request list. */
415 else
417 ospf_ls_request_delete (onbr, ls_req);
418 ospf_check_nbr_loading (onbr);
423 #ifdef HAVE_OPAQUE_LSA
424 if (IS_OPAQUE_LSA (lsa->data->type))
426 if (! CHECK_FLAG (onbr->options, OSPF_OPTION_O))
428 if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
429 zlog_debug ("Skip this neighbor: Not Opaque-capable.");
430 continue;
433 if (IS_OPAQUE_LSA_ORIGINATION_BLOCKED (oi->ospf->opaque)
434 && IS_LSA_SELF (lsa)
435 && onbr->state == NSM_Full)
437 /* Small attempt to reduce unnecessary retransmission. */
438 if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
439 zlog_debug ("Skip this neighbor: Initial flushing done.");
440 continue;
443 #endif /* HAVE_OPAQUE_LSA */
445 /* If the new LSA was received from this neighbor,
446 examine the next neighbor. */
447 #ifdef ORIGINAL_CODING
448 if (inbr)
449 if (IPV4_ADDR_SAME (&inbr->router_id, &onbr->router_id))
450 continue;
451 #else /* ORIGINAL_CODING */
452 if (inbr)
455 * Triggered by LSUpd message parser "ospf_ls_upd ()".
456 * E.g., all LSAs handling here is received via network.
458 if (IPV4_ADDR_SAME (&inbr->router_id, &onbr->router_id))
460 if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
461 zlog_debug ("Skip this neighbor: inbr == onbr");
462 continue;
465 else
468 * Triggered by MaxAge remover, so far.
469 * NULL "inbr" means flooding starts from this node.
471 if (IPV4_ADDR_SAME (&lsa->data->adv_router, &onbr->router_id))
473 if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
474 zlog_debug ("Skip this neighbor: lsah->adv_router == onbr");
475 continue;
478 #endif /* ORIGINAL_CODING */
480 /* Add the new LSA to the Link state retransmission list
481 for the adjacency. The LSA will be retransmitted
482 at intervals until an acknowledgment is seen from
483 the neighbor. */
484 ospf_ls_retransmit_add (onbr, lsa);
485 retx_flag = 1;
488 /* If in the previous step, the LSA was NOT added to any of
489 the Link state retransmission lists, there is no need to
490 flood the LSA out the interface. */
491 if (retx_flag == 0)
493 return (inbr && inbr->oi == oi);
496 /* if we've received the lsa on this interface we need to perform
497 additional checking */
498 if (inbr && (inbr->oi == oi))
500 /* If the new LSA was received on this interface, and it was
501 received from either the Designated Router or the Backup
502 Designated Router, chances are that all the neighbors have
503 received the LSA already. */
504 if (NBR_IS_DR (inbr) || NBR_IS_BDR (inbr))
506 if (IS_DEBUG_OSPF_NSSA)
507 zlog_debug ("ospf_flood_through_interface(): "
508 "DR/BDR NOT SEND to int %s", IF_NAME (oi));
509 return 1;
512 /* If the new LSA was received on this interface, and the
513 interface state is Backup, examine the next interface. The
514 Designated Router will do the flooding on this interface.
515 However, if the Designated Router fails the router will
516 end up retransmitting the updates. */
518 if (oi->state == ISM_Backup)
520 if (IS_DEBUG_OSPF_NSSA)
521 zlog_debug ("ospf_flood_through_interface(): "
522 "ISM_Backup NOT SEND to int %s", IF_NAME (oi));
523 return 1;
527 /* The LSA must be flooded out the interface. Send a Link State
528 Update packet (including the new LSA as contents) out the
529 interface. The LSA's LS age must be incremented by InfTransDelay
530 (which must be > 0) when it is copied into the outgoing Link
531 State Update packet (until the LS age field reaches the maximum
532 value of MaxAge). */
533 /* XXX HASSO: Is this IS_DEBUG_OSPF_NSSA really correct? */
534 if (IS_DEBUG_OSPF_NSSA)
535 zlog_debug ("ospf_flood_through_interface(): "
536 "DR/BDR sending upd to int %s", IF_NAME (oi));
538 /* RFC2328 Section 13.3
539 On non-broadcast networks, separate Link State Update
540 packets must be sent, as unicasts, to each adjacent neighbor
541 (i.e., those in state Exchange or greater). The destination
542 IP addresses for these packets are the neighbors' IP
543 addresses. */
544 if (oi->type == OSPF_IFTYPE_NBMA)
546 struct route_node *rn;
547 struct ospf_neighbor *nbr;
549 for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
550 if ((nbr = rn->info) != NULL)
551 if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange)
552 ospf_ls_upd_send_lsa (nbr, lsa, OSPF_SEND_PACKET_DIRECT);
554 else
555 ospf_ls_upd_send_lsa (oi->nbr_self, lsa, OSPF_SEND_PACKET_INDIRECT);
557 return 0;
561 ospf_flood_through_area (struct ospf_area *area,
562 struct ospf_neighbor *inbr, struct ospf_lsa *lsa)
564 struct listnode *node, *nnode;
565 struct ospf_interface *oi;
566 int lsa_ack_flag = 0;
568 /* All other types are specific to a single area (Area A). The
569 eligible interfaces are all those interfaces attaching to the
570 Area A. If Area A is the backbone, this includes all the virtual
571 links. */
572 for (ALL_LIST_ELEMENTS (area->oiflist, node, nnode, oi))
574 if (area->area_id.s_addr != OSPF_AREA_BACKBONE &&
575 oi->type == OSPF_IFTYPE_VIRTUALLINK)
576 continue;
578 #ifdef HAVE_OPAQUE_LSA
579 if ((lsa->data->type == OSPF_OPAQUE_LINK_LSA) && (lsa->oi != oi))
582 * Link local scoped Opaque-LSA should only be flooded
583 * for the link on which the LSA has received.
585 if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
586 zlog_debug ("Type-9 Opaque-LSA: lsa->oi(%p) != oi(%p)", lsa->oi, oi);
587 continue;
589 #endif /* HAVE_OPAQUE_LSA */
591 if (ospf_flood_through_interface (oi, inbr, lsa))
592 lsa_ack_flag = 1;
595 return (lsa_ack_flag);
599 ospf_flood_through_as (struct ospf *ospf, struct ospf_neighbor *inbr,
600 struct ospf_lsa *lsa)
602 struct listnode *node;
603 struct ospf_area *area;
604 int lsa_ack_flag;
606 lsa_ack_flag = 0;
608 /* The incoming LSA is type 5 or type 7 (AS-EXTERNAL or AS-NSSA )
610 Divert the Type-5 LSA's to all non-NSSA/STUB areas
612 Divert the Type-7 LSA's to all NSSA areas
614 AS-external-LSAs are flooded throughout the entire AS, with the
615 exception of stub areas (see Section 3.6). The eligible
616 interfaces are all the router's interfaces, excluding virtual
617 links and those interfaces attaching to stub areas. */
619 if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)) /* Translated from 7 */
620 if (IS_DEBUG_OSPF_NSSA)
621 zlog_debug ("Flood/AS: NSSA TRANSLATED LSA");
623 for (ALL_LIST_ELEMENTS_RO (ospf->areas, node, area))
625 int continue_flag = 0;
626 struct listnode *if_node;
627 struct ospf_interface *oi;
629 switch (area->external_routing)
631 /* Don't send AS externals into stub areas. Various types
632 of support for partial stub areas can be implemented
633 here. NSSA's will receive Type-7's that have areas
634 matching the originl LSA. */
635 case OSPF_AREA_NSSA: /* Sending Type 5 or 7 into NSSA area */
636 /* Type-7, flood NSSA area */
637 if (lsa->data->type == OSPF_AS_NSSA_LSA
638 && area == lsa->area)
639 /* We will send it. */
640 continue_flag = 0;
641 else
642 continue_flag = 1; /* Skip this NSSA area for Type-5's et al */
643 break;
645 case OSPF_AREA_TYPE_MAX:
646 case OSPF_AREA_STUB:
647 continue_flag = 1; /* Skip this area. */
648 break;
650 case OSPF_AREA_DEFAULT:
651 default:
652 /* No Type-7 into normal area */
653 if (lsa->data->type == OSPF_AS_NSSA_LSA)
654 continue_flag = 1; /* skip Type-7 */
655 else
656 continue_flag = 0; /* Do this area. */
657 break;
660 /* Do continue for above switch. Saves a big if then mess */
661 if (continue_flag)
662 continue; /* main for-loop */
664 /* send to every interface in this area */
666 for (ALL_LIST_ELEMENTS_RO (area->oiflist, if_node, oi))
668 /* Skip virtual links */
669 if (oi->type != OSPF_IFTYPE_VIRTUALLINK)
670 if (ospf_flood_through_interface (oi, inbr, lsa)) /* lsa */
671 lsa_ack_flag = 1;
673 } /* main area for-loop */
675 return (lsa_ack_flag);
679 ospf_flood_through (struct ospf *ospf,
680 struct ospf_neighbor *inbr, struct ospf_lsa *lsa)
682 int lsa_ack_flag = 0;
684 /* Type-7 LSA's for NSSA are flooded throughout the AS here, and
685 upon return are updated in the LSDB for Type-7's. Later,
686 re-fresh will re-send them (and also, if ABR, packet code will
687 translate to Type-5's)
689 As usual, Type-5 LSA's (if not DISCARDED because we are STUB or
690 NSSA) are flooded throughout the AS, and are updated in the
691 global table. */
692 #ifdef ORIGINAL_CODING
693 switch (lsa->data->type)
695 case OSPF_ROUTER_LSA:
696 case OSPF_NETWORK_LSA:
697 case OSPF_SUMMARY_LSA:
698 case OSPF_ASBR_SUMMARY_LSA:
699 #ifdef HAVE_OPAQUE_LSA
700 case OSPF_OPAQUE_LINK_LSA: /* ospf_flood_through_interface ? */
701 case OSPF_OPAQUE_AREA_LSA:
702 #endif /* HAVE_OPAQUE_LSA */
703 lsa_ack_flag = ospf_flood_through_area (inbr->oi->area, inbr, lsa);
704 break;
705 case OSPF_AS_EXTERNAL_LSA: /* Type-5 */
706 #ifdef HAVE_OPAQUE_LSA
707 case OSPF_OPAQUE_AS_LSA:
708 #endif /* HAVE_OPAQUE_LSA */
709 lsa_ack_flag = ospf_flood_through_as (ospf, inbr, lsa);
710 break;
711 /* Type-7 Only received within NSSA, then flooded */
712 case OSPF_AS_NSSA_LSA:
713 /* Any P-bit was installed with the Type-7. */
714 lsa_ack_flag = ospf_flood_through_area (inbr->oi->area, inbr, lsa);
716 if (IS_DEBUG_OSPF_NSSA)
717 zlog_debug ("ospf_flood_through: LOCAL NSSA FLOOD of Type-7.");
718 break;
719 default:
720 break;
722 #else /* ORIGINAL_CODING */
724 * At the common sub-sub-function "ospf_flood_through_interface()",
725 * a parameter "inbr" will be used to distinguish the called context
726 * whether the given LSA was received from the neighbor, or the
727 * flooding for the LSA starts from this node (e.g. the LSA was self-
728 * originated, or the LSA is going to be flushed from routing domain).
730 * So, for consistency reasons, this function "ospf_flood_through()"
731 * should also allow the usage that the given "inbr" parameter to be
732 * NULL. If we do so, corresponding AREA parameter should be referred
733 * by "lsa->area", instead of "inbr->oi->area".
735 switch (lsa->data->type)
737 case OSPF_AS_EXTERNAL_LSA: /* Type-5 */
738 #ifdef HAVE_OPAQUE_LSA
739 case OSPF_OPAQUE_AS_LSA:
740 #endif /* HAVE_OPAQUE_LSA */
741 lsa_ack_flag = ospf_flood_through_as (ospf, inbr, lsa);
742 break;
743 /* Type-7 Only received within NSSA, then flooded */
744 case OSPF_AS_NSSA_LSA:
745 /* Any P-bit was installed with the Type-7. */
747 if (IS_DEBUG_OSPF_NSSA)
748 zlog_debug ("ospf_flood_through: LOCAL NSSA FLOOD of Type-7.");
749 /* Fallthrough */
750 default:
751 lsa_ack_flag = ospf_flood_through_area (lsa->area, inbr, lsa);
752 break;
754 #endif /* ORIGINAL_CODING */
756 return (lsa_ack_flag);
761 /* Management functions for neighbor's Link State Request list. */
762 void
763 ospf_ls_request_add (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
766 * We cannot make use of the newly introduced callback function
767 * "lsdb->new_lsa_hook" to replace debug output below, just because
768 * it seems no simple and smart way to pass neighbor information to
769 * the common function "ospf_lsdb_add()" -- endo.
771 if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
772 zlog_debug ("RqstL(%lu)++, NBR(%s), LSA[%s]",
773 ospf_ls_request_count (nbr),
774 inet_ntoa (nbr->router_id), dump_lsa_key (lsa));
776 ospf_lsdb_add (&nbr->ls_req, lsa);
779 unsigned long
780 ospf_ls_request_count (struct ospf_neighbor *nbr)
782 return ospf_lsdb_count_all (&nbr->ls_req);
786 ospf_ls_request_isempty (struct ospf_neighbor *nbr)
788 return ospf_lsdb_isempty (&nbr->ls_req);
791 /* Remove LSA from neighbor's ls-request list. */
792 void
793 ospf_ls_request_delete (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
795 if (nbr->ls_req_last == lsa)
797 ospf_lsa_unlock (&nbr->ls_req_last);
798 nbr->ls_req_last = NULL;
801 if (IS_DEBUG_OSPF (lsa, LSA_FLOODING)) /* -- endo. */
802 zlog_debug ("RqstL(%lu)--, NBR(%s), LSA[%s]",
803 ospf_ls_request_count (nbr),
804 inet_ntoa (nbr->router_id), dump_lsa_key (lsa));
806 ospf_lsdb_delete (&nbr->ls_req, lsa);
809 /* Remove all LSA from neighbor's ls-requenst list. */
810 void
811 ospf_ls_request_delete_all (struct ospf_neighbor *nbr)
813 ospf_lsa_unlock (&nbr->ls_req_last);
814 nbr->ls_req_last = NULL;
815 ospf_lsdb_delete_all (&nbr->ls_req);
818 /* Lookup LSA from neighbor's ls-request list. */
819 struct ospf_lsa *
820 ospf_ls_request_lookup (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
822 return ospf_lsdb_lookup (&nbr->ls_req, lsa);
825 struct ospf_lsa *
826 ospf_ls_request_new (struct lsa_header *lsah)
828 struct ospf_lsa *new;
830 new = ospf_lsa_new ();
831 new->data = ospf_lsa_data_new (OSPF_LSA_HEADER_SIZE);
832 memcpy (new->data, lsah, OSPF_LSA_HEADER_SIZE);
834 return new;
838 /* Management functions for neighbor's ls-retransmit list. */
839 unsigned long
840 ospf_ls_retransmit_count (struct ospf_neighbor *nbr)
842 return ospf_lsdb_count_all (&nbr->ls_rxmt);
845 unsigned long
846 ospf_ls_retransmit_count_self (struct ospf_neighbor *nbr, int lsa_type)
848 return ospf_lsdb_count_self (&nbr->ls_rxmt, lsa_type);
852 ospf_ls_retransmit_isempty (struct ospf_neighbor *nbr)
854 return ospf_lsdb_isempty (&nbr->ls_rxmt);
857 /* Add LSA to be retransmitted to neighbor's ls-retransmit list. */
858 void
859 ospf_ls_retransmit_add (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
861 struct ospf_lsa *old;
863 old = ospf_ls_retransmit_lookup (nbr, lsa);
865 if (ospf_lsa_more_recent (old, lsa) < 0)
867 if (old)
869 old->retransmit_counter--;
870 ospf_lsdb_delete (&nbr->ls_rxmt, old);
872 lsa->retransmit_counter++;
874 * We cannot make use of the newly introduced callback function
875 * "lsdb->new_lsa_hook" to replace debug output below, just because
876 * it seems no simple and smart way to pass neighbor information to
877 * the common function "ospf_lsdb_add()" -- endo.
879 if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
880 zlog_debug ("RXmtL(%lu)++, NBR(%s), LSA[%s]",
881 ospf_ls_retransmit_count (nbr),
882 inet_ntoa (nbr->router_id), dump_lsa_key (lsa));
883 ospf_lsdb_add (&nbr->ls_rxmt, lsa);
887 /* Remove LSA from neibghbor's ls-retransmit list. */
888 void
889 ospf_ls_retransmit_delete (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
891 if (ospf_ls_retransmit_lookup (nbr, lsa))
893 lsa->retransmit_counter--;
894 if (IS_DEBUG_OSPF (lsa, LSA_FLOODING)) /* -- endo. */
895 zlog_debug ("RXmtL(%lu)--, NBR(%s), LSA[%s]",
896 ospf_ls_retransmit_count (nbr),
897 inet_ntoa (nbr->router_id), dump_lsa_key (lsa));
898 ospf_lsdb_delete (&nbr->ls_rxmt, lsa);
902 /* Clear neighbor's ls-retransmit list. */
903 void
904 ospf_ls_retransmit_clear (struct ospf_neighbor *nbr)
906 struct ospf_lsdb *lsdb;
907 int i;
909 lsdb = &nbr->ls_rxmt;
911 for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++)
913 struct route_table *table = lsdb->type[i].db;
914 struct route_node *rn;
915 struct ospf_lsa *lsa;
917 for (rn = route_top (table); rn; rn = route_next (rn))
918 if ((lsa = rn->info) != NULL)
919 ospf_ls_retransmit_delete (nbr, lsa);
922 ospf_lsa_unlock (&nbr->ls_req_last);
923 nbr->ls_req_last = NULL;
926 /* Lookup LSA from neighbor's ls-retransmit list. */
927 struct ospf_lsa *
928 ospf_ls_retransmit_lookup (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
930 return ospf_lsdb_lookup (&nbr->ls_rxmt, lsa);
933 static void
934 ospf_ls_retransmit_delete_nbr_if (struct ospf_interface *oi,
935 struct ospf_lsa *lsa)
937 struct route_node *rn;
938 struct ospf_neighbor *nbr;
939 struct ospf_lsa *lsr;
941 if (ospf_if_is_enable (oi))
942 for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
943 /* If LSA find in LS-retransmit list, then remove it. */
944 if ((nbr = rn->info) != NULL)
946 lsr = ospf_ls_retransmit_lookup (nbr, lsa);
948 /* If LSA find in ls-retransmit list, remove it. */
949 if (lsr != NULL && lsr->data->ls_seqnum == lsa->data->ls_seqnum)
950 ospf_ls_retransmit_delete (nbr, lsr);
954 void
955 ospf_ls_retransmit_delete_nbr_area (struct ospf_area *area,
956 struct ospf_lsa *lsa)
958 struct listnode *node, *nnode;
959 struct ospf_interface *oi;
961 for (ALL_LIST_ELEMENTS (area->oiflist, node, nnode, oi))
962 ospf_ls_retransmit_delete_nbr_if (oi, lsa);
965 void
966 ospf_ls_retransmit_delete_nbr_as (struct ospf *ospf, struct ospf_lsa *lsa)
968 struct listnode *node, *nnode;
969 struct ospf_interface *oi;
971 for (ALL_LIST_ELEMENTS (ospf->oiflist, node, nnode, oi))
972 ospf_ls_retransmit_delete_nbr_if (oi, lsa);
976 /* Sets ls_age to MaxAge and floods throu the area.
977 When we implement ASE routing, there will be anothe function
978 flushing an LSA from the whole domain. */
979 void
980 ospf_lsa_flush_area (struct ospf_lsa *lsa, struct ospf_area *area)
982 lsa->data->ls_age = htons (OSPF_LSA_MAXAGE);
983 ospf_flood_through_area (area, NULL, lsa);
984 ospf_lsa_maxage (area->ospf, lsa);
987 void
988 ospf_lsa_flush_as (struct ospf *ospf, struct ospf_lsa *lsa)
990 lsa->data->ls_age = htons (OSPF_LSA_MAXAGE);
991 ospf_flood_through_as (ospf, NULL, lsa);
992 ospf_lsa_maxage (ospf, lsa);