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