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1 | /* | |
2 | * OSPF version 2 Neighbor State Machine | |
3 | * From RFC2328 [OSPF Version 2] | |
4 | * Copyright (C) 1999, 2000 Toshiaki Takada | |
5 | * | |
6 | * This file is part of GNU Zebra. | |
7 | * | |
8 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2, or (at your option) any | |
11 | * later version. | |
12 | * | |
13 | * GNU Zebra is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
20 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
21 | * 02111-1307, USA. | |
22 | */ | |
23 | ||
24 | #include <zebra.h> | |
25 | ||
26 | #include "thread.h" | |
27 | #include "memory.h" | |
28 | #include "hash.h" | |
29 | #include "linklist.h" | |
30 | #include "prefix.h" | |
31 | #include "if.h" | |
32 | #include "table.h" | |
33 | #include "stream.h" | |
34 | #include "table.h" | |
35 | #include "log.h" | |
36 | ||
37 | #include "ospfd/ospfd.h" | |
38 | #include "ospfd/ospf_interface.h" | |
39 | #include "ospfd/ospf_ism.h" | |
40 | #include "ospfd/ospf_asbr.h" | |
41 | #include "ospfd/ospf_lsa.h" | |
42 | #include "ospfd/ospf_lsdb.h" | |
43 | #include "ospfd/ospf_neighbor.h" | |
44 | #include "ospfd/ospf_nsm.h" | |
45 | #include "ospfd/ospf_network.h" | |
46 | #include "ospfd/ospf_packet.h" | |
47 | #include "ospfd/ospf_dump.h" | |
48 | #include "ospfd/ospf_flood.h" | |
49 | #include "ospfd/ospf_abr.h" | |
50 | #include "ospfd/ospf_snmp.h" | |
51 | ||
52 | void nsm_reset_nbr (struct ospf_neighbor *); | |
53 | ||
54 | \f | |
55 | /* OSPF NSM Timer functions. */ | |
56 | static int | |
57 | ospf_inactivity_timer (struct thread *thread) | |
58 | { | |
59 | struct ospf_neighbor *nbr; | |
60 | ||
61 | nbr = THREAD_ARG (thread); | |
62 | nbr->t_inactivity = NULL; | |
63 | ||
64 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
65 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Inactivity timer expire)", | |
66 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); | |
67 | ||
68 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_InactivityTimer); | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | static int | |
74 | ospf_db_desc_timer (struct thread *thread) | |
75 | { | |
76 | struct ospf_interface *oi; | |
77 | struct ospf_neighbor *nbr; | |
78 | ||
79 | nbr = THREAD_ARG (thread); | |
80 | nbr->t_db_desc = NULL; | |
81 | ||
82 | oi = nbr->oi; | |
83 | ||
84 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
85 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (DD Retransmit timer expire)", | |
86 | IF_NAME (nbr->oi), inet_ntoa (nbr->src)); | |
87 | ||
88 | /* resent last send DD packet. */ | |
89 | assert (nbr->last_send); | |
90 | ospf_db_desc_resend (nbr); | |
91 | ||
92 | /* DD Retransmit timer set. */ | |
93 | OSPF_NSM_TIMER_ON (nbr->t_db_desc, ospf_db_desc_timer, nbr->v_db_desc); | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | /* Hook function called after ospf NSM event is occured. */ | |
99 | ||
100 | static void | |
101 | nsm_timer_set (struct ospf_neighbor *nbr) | |
102 | { | |
103 | switch (nbr->state) | |
104 | { | |
105 | case NSM_Down: | |
106 | /* This is here for documentation purposes, don't actually get here | |
107 | * as Down neighbours are deleted typically, see nsm_kill_nbr | |
108 | */ | |
109 | OSPF_NSM_TIMER_OFF (nbr->t_inactivity); | |
110 | case NSM_Attempt: | |
111 | case NSM_Init: | |
112 | case NSM_TwoWay: | |
113 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
114 | OSPF_NSM_TIMER_OFF (nbr->t_ls_upd); | |
115 | OSPF_NSM_TIMER_OFF (nbr->t_ls_req); | |
116 | break; | |
117 | case NSM_ExStart: | |
118 | OSPF_NSM_TIMER_ON (nbr->t_db_desc, ospf_db_desc_timer, nbr->v_db_desc); | |
119 | OSPF_NSM_TIMER_OFF (nbr->t_ls_upd); | |
120 | OSPF_NSM_TIMER_OFF (nbr->t_ls_req); | |
121 | break; | |
122 | case NSM_Exchange: | |
123 | OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
124 | if (!IS_SET_DD_MS (nbr->dd_flags)) | |
125 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
126 | break; | |
127 | case NSM_Loading: | |
128 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
129 | break; | |
130 | case NSM_Full: | |
131 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
132 | break; | |
133 | default: | |
134 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
135 | break; | |
136 | } | |
137 | } | |
138 | ||
139 | /* 10.4 of RFC2328, indicate whether an adjacency is appropriate with | |
140 | * the given neighbour | |
141 | */ | |
142 | static int | |
143 | nsm_should_adj (struct ospf_neighbor *nbr) | |
144 | { | |
145 | struct ospf_interface *oi; | |
146 | ||
147 | oi = nbr->oi; | |
148 | ||
149 | /* These network types must always form adjacencies. */ | |
150 | if (oi->type == OSPF_IFTYPE_POINTOPOINT | |
151 | || oi->type == OSPF_IFTYPE_POINTOMULTIPOINT | |
152 | || oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
153 | return 1; | |
154 | ||
155 | /* Router itself is the DRouter or the BDRouter. */ | |
156 | if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &DR (oi)) | |
157 | || IPV4_ADDR_SAME (&oi->address->u.prefix4, &BDR (oi))) | |
158 | return 1; | |
159 | ||
160 | /* Neighboring Router is the DRouter or the BDRouter. */ | |
161 | if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &DR (oi)) | |
162 | || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &BDR (oi))) | |
163 | return 1; | |
164 | ||
165 | return 0; | |
166 | } | |
167 | \f | |
168 | /* OSPF NSM functions. */ | |
169 | static int | |
170 | nsm_ignore (struct ospf_neighbor *nbr) | |
171 | { | |
172 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) | |
173 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: nsm_ignore called", | |
174 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static int | |
180 | nsm_hello_received (struct ospf_neighbor *nbr) | |
181 | { | |
182 | /* Start or Restart Inactivity Timer. */ | |
183 | OSPF_NSM_TIMER_OFF (nbr->t_inactivity); | |
184 | ||
185 | OSPF_NSM_TIMER_ON (nbr->t_inactivity, ospf_inactivity_timer, | |
186 | nbr->v_inactivity); | |
187 | ||
188 | if (nbr->oi->type == OSPF_IFTYPE_NBMA && nbr->nbr_nbma) | |
189 | OSPF_POLL_TIMER_OFF (nbr->nbr_nbma->t_poll); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static int | |
195 | nsm_start (struct ospf_neighbor *nbr) | |
196 | { | |
197 | ||
198 | nsm_reset_nbr (nbr); | |
199 | ||
200 | if (nbr->nbr_nbma) | |
201 | OSPF_POLL_TIMER_OFF (nbr->nbr_nbma->t_poll); | |
202 | ||
203 | OSPF_NSM_TIMER_OFF (nbr->t_inactivity); | |
204 | ||
205 | OSPF_NSM_TIMER_ON (nbr->t_inactivity, ospf_inactivity_timer, | |
206 | nbr->v_inactivity); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | static int | |
212 | nsm_twoway_received (struct ospf_neighbor *nbr) | |
213 | { | |
214 | int next_state = NSM_TwoWay; | |
215 | ||
216 | if (nsm_should_adj (nbr)) | |
217 | next_state = NSM_ExStart; | |
218 | ||
219 | return next_state; | |
220 | } | |
221 | ||
222 | int | |
223 | ospf_db_summary_count (struct ospf_neighbor *nbr) | |
224 | { | |
225 | return ospf_lsdb_count_all (&nbr->db_sum); | |
226 | } | |
227 | ||
228 | int | |
229 | ospf_db_summary_isempty (struct ospf_neighbor *nbr) | |
230 | { | |
231 | return ospf_lsdb_isempty (&nbr->db_sum); | |
232 | } | |
233 | ||
234 | static int | |
235 | ospf_db_summary_add (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
236 | { | |
237 | #ifdef HAVE_OPAQUE_LSA | |
238 | switch (lsa->data->type) | |
239 | { | |
240 | case OSPF_OPAQUE_LINK_LSA: | |
241 | /* Exclude type-9 LSAs that does not have the same "oi" with "nbr". */ | |
242 | if (lsa->oi != nbr->oi) | |
243 | return 0; | |
244 | break; | |
245 | case OSPF_OPAQUE_AREA_LSA: | |
246 | /* | |
247 | * It is assured by the caller function "nsm_negotiation_done()" | |
248 | * that every given LSA belongs to the same area with "nbr". | |
249 | */ | |
250 | break; | |
251 | case OSPF_OPAQUE_AS_LSA: | |
252 | default: | |
253 | break; | |
254 | } | |
255 | #endif /* HAVE_OPAQUE_LSA */ | |
256 | ||
257 | /* Stay away from any Local Translated Type-7 LSAs */ | |
258 | if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
259 | return 0; | |
260 | ||
261 | if (IS_LSA_MAXAGE (lsa)) | |
262 | ospf_ls_retransmit_add (nbr, lsa); | |
263 | else | |
264 | ospf_lsdb_add (&nbr->db_sum, lsa); | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | void | |
270 | ospf_db_summary_clear (struct ospf_neighbor *nbr) | |
271 | { | |
272 | struct ospf_lsdb *lsdb; | |
273 | int i; | |
274 | ||
275 | lsdb = &nbr->db_sum; | |
276 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
277 | { | |
278 | struct route_table *table = lsdb->type[i].db; | |
279 | struct route_node *rn; | |
280 | ||
281 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
282 | if (rn->info) | |
283 | ospf_lsdb_delete (&nbr->db_sum, rn->info); | |
284 | } | |
285 | } | |
286 | ||
287 | \f | |
288 | ||
289 | /* The area link state database consists of the router-LSAs, | |
290 | network-LSAs and summary-LSAs contained in the area structure, | |
291 | along with the AS-external-LSAs contained in the global structure. | |
292 | AS-external-LSAs are omitted from a virtual neighbor's Database | |
293 | summary list. AS-external-LSAs are omitted from the Database | |
294 | summary list if the area has been configured as a stub. */ | |
295 | static int | |
296 | nsm_negotiation_done (struct ospf_neighbor *nbr) | |
297 | { | |
298 | struct ospf_area *area = nbr->oi->area; | |
299 | struct ospf_lsa *lsa; | |
300 | struct route_node *rn; | |
301 | ||
302 | LSDB_LOOP (ROUTER_LSDB (area), rn, lsa) | |
303 | ospf_db_summary_add (nbr, lsa); | |
304 | LSDB_LOOP (NETWORK_LSDB (area), rn, lsa) | |
305 | ospf_db_summary_add (nbr, lsa); | |
306 | LSDB_LOOP (SUMMARY_LSDB (area), rn, lsa) | |
307 | ospf_db_summary_add (nbr, lsa); | |
308 | LSDB_LOOP (ASBR_SUMMARY_LSDB (area), rn, lsa) | |
309 | ospf_db_summary_add (nbr, lsa); | |
310 | ||
311 | #ifdef HAVE_OPAQUE_LSA | |
312 | /* Process only if the neighbor is opaque capable. */ | |
313 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
314 | { | |
315 | LSDB_LOOP (OPAQUE_LINK_LSDB (area), rn, lsa) | |
316 | ospf_db_summary_add (nbr, lsa); | |
317 | LSDB_LOOP (OPAQUE_AREA_LSDB (area), rn, lsa) | |
318 | ospf_db_summary_add (nbr, lsa); | |
319 | } | |
320 | #endif /* HAVE_OPAQUE_LSA */ | |
321 | ||
322 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_NP)) | |
323 | { | |
324 | LSDB_LOOP (NSSA_LSDB (area), rn, lsa) | |
325 | ospf_db_summary_add (nbr, lsa); | |
326 | } | |
327 | ||
328 | if (nbr->oi->type != OSPF_IFTYPE_VIRTUALLINK | |
329 | && area->external_routing == OSPF_AREA_DEFAULT) | |
330 | LSDB_LOOP (EXTERNAL_LSDB (nbr->oi->ospf), rn, lsa) | |
331 | ospf_db_summary_add (nbr, lsa); | |
332 | ||
333 | #ifdef HAVE_OPAQUE_LSA | |
334 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O) | |
335 | && (nbr->oi->type != OSPF_IFTYPE_VIRTUALLINK | |
336 | && area->external_routing == OSPF_AREA_DEFAULT)) | |
337 | LSDB_LOOP (OPAQUE_AS_LSDB (nbr->oi->ospf), rn, lsa) | |
338 | ospf_db_summary_add (nbr, lsa); | |
339 | #endif /* HAVE_OPAQUE_LSA */ | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static int | |
345 | nsm_exchange_done (struct ospf_neighbor *nbr) | |
346 | { | |
347 | if (ospf_ls_request_isempty (nbr)) | |
348 | return NSM_Full; | |
349 | ||
350 | /* Cancel dd retransmit timer. */ | |
351 | /* OSPF_NSM_TIMER_OFF (nbr->t_db_desc); */ | |
352 | ||
353 | /* Send Link State Request. */ | |
354 | ospf_ls_req_send (nbr); | |
355 | ||
356 | return NSM_Loading; | |
357 | } | |
358 | ||
359 | static int | |
360 | nsm_bad_ls_req (struct ospf_neighbor *nbr) | |
361 | { | |
362 | /* Clear neighbor. */ | |
363 | nsm_reset_nbr (nbr); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static int | |
369 | nsm_adj_ok (struct ospf_neighbor *nbr) | |
370 | { | |
371 | int next_state = nbr->state; | |
372 | int adj = nsm_should_adj (nbr); | |
373 | ||
374 | if (nbr->state == NSM_TwoWay && adj == 1) | |
375 | next_state = NSM_ExStart; | |
376 | else if (nbr->state >= NSM_ExStart && adj == 0) | |
377 | next_state = NSM_TwoWay; | |
378 | ||
379 | return next_state; | |
380 | } | |
381 | ||
382 | static int | |
383 | nsm_seq_number_mismatch (struct ospf_neighbor *nbr) | |
384 | { | |
385 | /* Clear neighbor. */ | |
386 | nsm_reset_nbr (nbr); | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | static int | |
392 | nsm_oneway_received (struct ospf_neighbor *nbr) | |
393 | { | |
394 | /* Clear neighbor. */ | |
395 | nsm_reset_nbr (nbr); | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | void | |
401 | nsm_reset_nbr (struct ospf_neighbor *nbr) | |
402 | { | |
403 | /* Clear Database Summary list. */ | |
404 | if (!ospf_db_summary_isempty (nbr)) | |
405 | ospf_db_summary_clear (nbr); | |
406 | ||
407 | /* Clear Link State Request list. */ | |
408 | if (!ospf_ls_request_isempty (nbr)) | |
409 | ospf_ls_request_delete_all (nbr); | |
410 | ||
411 | /* Clear Link State Retransmission list. */ | |
412 | if (!ospf_ls_retransmit_isempty (nbr)) | |
413 | ospf_ls_retransmit_clear (nbr); | |
414 | ||
415 | /* Cancel thread. */ | |
416 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
417 | OSPF_NSM_TIMER_OFF (nbr->t_ls_req); | |
418 | OSPF_NSM_TIMER_OFF (nbr->t_ls_upd); | |
419 | OSPF_NSM_TIMER_OFF (nbr->t_hello_reply); | |
420 | ||
421 | #ifdef HAVE_OPAQUE_LSA | |
422 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
423 | UNSET_FLAG (nbr->options, OSPF_OPTION_O); | |
424 | #endif /* HAVE_OPAQUE_LSA */ | |
425 | } | |
426 | ||
427 | static int | |
428 | nsm_kill_nbr (struct ospf_neighbor *nbr) | |
429 | { | |
430 | /* call it here because we cannot call it from ospf_nsm_event */ | |
431 | nsm_change_state (nbr, NSM_Down); | |
432 | ||
433 | /* killing nbr_self is invalid */ | |
434 | assert (nbr != nbr->oi->nbr_self); | |
435 | if (nbr == nbr->oi->nbr_self) | |
436 | return 1; | |
437 | ||
438 | /* Reset neighbor. */ | |
439 | nsm_reset_nbr (nbr); | |
440 | ||
441 | if (nbr->oi->type == OSPF_IFTYPE_NBMA && nbr->nbr_nbma != NULL) | |
442 | { | |
443 | struct ospf_nbr_nbma *nbr_nbma = nbr->nbr_nbma; | |
444 | ||
445 | nbr_nbma->nbr = NULL; | |
446 | nbr_nbma->state_change = nbr->state_change; | |
447 | ||
448 | nbr->nbr_nbma = NULL; | |
449 | ||
450 | OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, | |
451 | nbr_nbma->v_poll); | |
452 | ||
453 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) | |
454 | zlog_debug ("NSM[%s:%s]: Down (PollIntervalTimer scheduled)", | |
455 | IF_NAME (nbr->oi), inet_ntoa (nbr->address.u.prefix4)); | |
456 | } | |
457 | ||
458 | /* Delete neighbor from interface. */ | |
459 | ospf_nbr_delete (nbr); | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | static int | |
465 | nsm_inactivity_timer (struct ospf_neighbor *nbr) | |
466 | { | |
467 | /* Kill neighbor. */ | |
468 | nsm_kill_nbr (nbr); | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static int | |
474 | nsm_ll_down (struct ospf_neighbor *nbr) | |
475 | { | |
476 | /* Reset neighbor. */ | |
477 | /*nsm_reset_nbr (nbr);*/ | |
478 | ||
479 | /* Kill neighbor. */ | |
480 | nsm_kill_nbr (nbr); | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | /* Neighbor State Machine */ | |
486 | struct { | |
487 | int (*func) (struct ospf_neighbor *); | |
488 | int next_state; | |
489 | } NSM [OSPF_NSM_STATE_MAX][OSPF_NSM_EVENT_MAX] = | |
490 | { | |
491 | { | |
492 | /* DependUpon: dummy state. */ | |
493 | { nsm_ignore, NSM_DependUpon }, /* NoEvent */ | |
494 | { nsm_ignore, NSM_DependUpon }, /* HelloReceived */ | |
495 | { nsm_ignore, NSM_DependUpon }, /* Start */ | |
496 | { nsm_ignore, NSM_DependUpon }, /* 2-WayReceived */ | |
497 | { nsm_ignore, NSM_DependUpon }, /* NegotiationDone */ | |
498 | { nsm_ignore, NSM_DependUpon }, /* ExchangeDone */ | |
499 | { nsm_ignore, NSM_DependUpon }, /* BadLSReq */ | |
500 | { nsm_ignore, NSM_DependUpon }, /* LoadingDone */ | |
501 | { nsm_ignore, NSM_DependUpon }, /* AdjOK? */ | |
502 | { nsm_ignore, NSM_DependUpon }, /* SeqNumberMismatch */ | |
503 | { nsm_ignore, NSM_DependUpon }, /* 1-WayReceived */ | |
504 | { nsm_ignore, NSM_DependUpon }, /* KillNbr */ | |
505 | { nsm_ignore, NSM_DependUpon }, /* InactivityTimer */ | |
506 | { nsm_ignore, NSM_DependUpon }, /* LLDown */ | |
507 | }, | |
508 | { | |
509 | /* Down: */ | |
510 | { nsm_ignore, NSM_DependUpon }, /* NoEvent */ | |
511 | { nsm_hello_received, NSM_Init }, /* HelloReceived */ | |
512 | { nsm_start, NSM_Attempt }, /* Start */ | |
513 | { nsm_ignore, NSM_Down }, /* 2-WayReceived */ | |
514 | { nsm_ignore, NSM_Down }, /* NegotiationDone */ | |
515 | { nsm_ignore, NSM_Down }, /* ExchangeDone */ | |
516 | { nsm_ignore, NSM_Down }, /* BadLSReq */ | |
517 | { nsm_ignore, NSM_Down }, /* LoadingDone */ | |
518 | { nsm_ignore, NSM_Down }, /* AdjOK? */ | |
519 | { nsm_ignore, NSM_Down }, /* SeqNumberMismatch */ | |
520 | { nsm_ignore, NSM_Down }, /* 1-WayReceived */ | |
521 | { nsm_kill_nbr, NSM_Down }, /* KillNbr */ | |
522 | { nsm_inactivity_timer, NSM_Down }, /* InactivityTimer */ | |
523 | { nsm_ll_down, NSM_Down }, /* LLDown */ | |
524 | }, | |
525 | { | |
526 | /* Attempt: */ | |
527 | { nsm_ignore, NSM_DependUpon }, /* NoEvent */ | |
528 | { nsm_hello_received, NSM_Init }, /* HelloReceived */ | |
529 | { nsm_ignore, NSM_Attempt }, /* Start */ | |
530 | { nsm_ignore, NSM_Attempt }, /* 2-WayReceived */ | |
531 | { nsm_ignore, NSM_Attempt }, /* NegotiationDone */ | |
532 | { nsm_ignore, NSM_Attempt }, /* ExchangeDone */ | |
533 | { nsm_ignore, NSM_Attempt }, /* BadLSReq */ | |
534 | { nsm_ignore, NSM_Attempt }, /* LoadingDone */ | |
535 | { nsm_ignore, NSM_Attempt }, /* AdjOK? */ | |
536 | { nsm_ignore, NSM_Attempt }, /* SeqNumberMismatch */ | |
537 | { nsm_ignore, NSM_Attempt }, /* 1-WayReceived */ | |
538 | { nsm_kill_nbr, NSM_Down }, /* KillNbr */ | |
539 | { nsm_inactivity_timer, NSM_Down }, /* InactivityTimer */ | |
540 | { nsm_ll_down, NSM_Down }, /* LLDown */ | |
541 | }, | |
542 | { | |
543 | /* Init: */ | |
544 | { nsm_ignore, NSM_DependUpon }, /* NoEvent */ | |
545 | { nsm_hello_received, NSM_Init }, /* HelloReceived */ | |
546 | { nsm_ignore, NSM_Init }, /* Start */ | |
547 | { nsm_twoway_received, NSM_DependUpon }, /* 2-WayReceived */ | |
548 | { nsm_ignore, NSM_Init }, /* NegotiationDone */ | |
549 | { nsm_ignore, NSM_Init }, /* ExchangeDone */ | |
550 | { nsm_ignore, NSM_Init }, /* BadLSReq */ | |
551 | { nsm_ignore, NSM_Init }, /* LoadingDone */ | |
552 | { nsm_ignore, NSM_Init }, /* AdjOK? */ | |
553 | { nsm_ignore, NSM_Init }, /* SeqNumberMismatch */ | |
554 | { nsm_ignore, NSM_Init }, /* 1-WayReceived */ | |
555 | { nsm_kill_nbr, NSM_Down }, /* KillNbr */ | |
556 | { nsm_inactivity_timer, NSM_Down }, /* InactivityTimer */ | |
557 | { nsm_ll_down, NSM_Down }, /* LLDown */ | |
558 | }, | |
559 | { | |
560 | /* 2-Way: */ | |
561 | { nsm_ignore, NSM_DependUpon }, /* NoEvent */ | |
562 | { nsm_hello_received, NSM_TwoWay }, /* HelloReceived */ | |
563 | { nsm_ignore, NSM_TwoWay }, /* Start */ | |
564 | { nsm_ignore, NSM_TwoWay }, /* 2-WayReceived */ | |
565 | { nsm_ignore, NSM_TwoWay }, /* NegotiationDone */ | |
566 | { nsm_ignore, NSM_TwoWay }, /* ExchangeDone */ | |
567 | { nsm_ignore, NSM_TwoWay }, /* BadLSReq */ | |
568 | { nsm_ignore, NSM_TwoWay }, /* LoadingDone */ | |
569 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ | |
570 | { nsm_ignore, NSM_TwoWay }, /* SeqNumberMismatch */ | |
571 | { nsm_oneway_received, NSM_Init }, /* 1-WayReceived */ | |
572 | { nsm_kill_nbr, NSM_Down }, /* KillNbr */ | |
573 | { nsm_inactivity_timer, NSM_Down }, /* InactivityTimer */ | |
574 | { nsm_ll_down, NSM_Down }, /* LLDown */ | |
575 | }, | |
576 | { | |
577 | /* ExStart: */ | |
578 | { nsm_ignore, NSM_DependUpon }, /* NoEvent */ | |
579 | { nsm_hello_received, NSM_ExStart }, /* HelloReceived */ | |
580 | { nsm_ignore, NSM_ExStart }, /* Start */ | |
581 | { nsm_ignore, NSM_ExStart }, /* 2-WayReceived */ | |
582 | { nsm_negotiation_done, NSM_Exchange }, /* NegotiationDone */ | |
583 | { nsm_ignore, NSM_ExStart }, /* ExchangeDone */ | |
584 | { nsm_ignore, NSM_ExStart }, /* BadLSReq */ | |
585 | { nsm_ignore, NSM_ExStart }, /* LoadingDone */ | |
586 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ | |
587 | { nsm_ignore, NSM_ExStart }, /* SeqNumberMismatch */ | |
588 | { nsm_oneway_received, NSM_Init }, /* 1-WayReceived */ | |
589 | { nsm_kill_nbr, NSM_Down }, /* KillNbr */ | |
590 | { nsm_inactivity_timer, NSM_Down }, /* InactivityTimer */ | |
591 | { nsm_ll_down, NSM_Down }, /* LLDown */ | |
592 | }, | |
593 | { | |
594 | /* Exchange: */ | |
595 | { nsm_ignore, NSM_DependUpon }, /* NoEvent */ | |
596 | { nsm_hello_received, NSM_Exchange }, /* HelloReceived */ | |
597 | { nsm_ignore, NSM_Exchange }, /* Start */ | |
598 | { nsm_ignore, NSM_Exchange }, /* 2-WayReceived */ | |
599 | { nsm_ignore, NSM_Exchange }, /* NegotiationDone */ | |
600 | { nsm_exchange_done, NSM_DependUpon }, /* ExchangeDone */ | |
601 | { nsm_bad_ls_req, NSM_ExStart }, /* BadLSReq */ | |
602 | { nsm_ignore, NSM_Exchange }, /* LoadingDone */ | |
603 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ | |
604 | { nsm_seq_number_mismatch, NSM_ExStart }, /* SeqNumberMismatch */ | |
605 | { nsm_oneway_received, NSM_Init }, /* 1-WayReceived */ | |
606 | { nsm_kill_nbr, NSM_Down }, /* KillNbr */ | |
607 | { nsm_inactivity_timer, NSM_Down }, /* InactivityTimer */ | |
608 | { nsm_ll_down, NSM_Down }, /* LLDown */ | |
609 | }, | |
610 | { | |
611 | /* Loading: */ | |
612 | { nsm_ignore, NSM_DependUpon }, /* NoEvent */ | |
613 | { nsm_hello_received, NSM_Loading }, /* HelloReceived */ | |
614 | { nsm_ignore, NSM_Loading }, /* Start */ | |
615 | { nsm_ignore, NSM_Loading }, /* 2-WayReceived */ | |
616 | { nsm_ignore, NSM_Loading }, /* NegotiationDone */ | |
617 | { nsm_ignore, NSM_Loading }, /* ExchangeDone */ | |
618 | { nsm_bad_ls_req, NSM_ExStart }, /* BadLSReq */ | |
619 | { nsm_ignore, NSM_Full }, /* LoadingDone */ | |
620 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ | |
621 | { nsm_seq_number_mismatch, NSM_ExStart }, /* SeqNumberMismatch */ | |
622 | { nsm_oneway_received, NSM_Init }, /* 1-WayReceived */ | |
623 | { nsm_kill_nbr, NSM_Down }, /* KillNbr */ | |
624 | { nsm_inactivity_timer, NSM_Down }, /* InactivityTimer */ | |
625 | { nsm_ll_down, NSM_Down }, /* LLDown */ | |
626 | }, | |
627 | { /* Full: */ | |
628 | { nsm_ignore, NSM_DependUpon }, /* NoEvent */ | |
629 | { nsm_hello_received, NSM_Full }, /* HelloReceived */ | |
630 | { nsm_ignore, NSM_Full }, /* Start */ | |
631 | { nsm_ignore, NSM_Full }, /* 2-WayReceived */ | |
632 | { nsm_ignore, NSM_Full }, /* NegotiationDone */ | |
633 | { nsm_ignore, NSM_Full }, /* ExchangeDone */ | |
634 | { nsm_bad_ls_req, NSM_ExStart }, /* BadLSReq */ | |
635 | { nsm_ignore, NSM_Full }, /* LoadingDone */ | |
636 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ | |
637 | { nsm_seq_number_mismatch, NSM_ExStart }, /* SeqNumberMismatch */ | |
638 | { nsm_oneway_received, NSM_Init }, /* 1-WayReceived */ | |
639 | { nsm_kill_nbr, NSM_Down }, /* KillNbr */ | |
640 | { nsm_inactivity_timer, NSM_Down }, /* InactivityTimer */ | |
641 | { nsm_ll_down, NSM_Down }, /* LLDown */ | |
642 | }, | |
643 | }; | |
644 | ||
645 | const static char *ospf_nsm_event_str[] = | |
646 | { | |
647 | "NoEvent", | |
648 | "HelloReceived", | |
649 | "Start", | |
650 | "2-WayReceived", | |
651 | "NegotiationDone", | |
652 | "ExchangeDone", | |
653 | "BadLSReq", | |
654 | "LoadingDone", | |
655 | "AdjOK?", | |
656 | "SeqNumberMismatch", | |
657 | "1-WayReceived", | |
658 | "KillNbr", | |
659 | "InactivityTimer", | |
660 | "LLDown", | |
661 | }; | |
662 | ||
663 | void | |
664 | nsm_change_state (struct ospf_neighbor *nbr, int state) | |
665 | { | |
666 | struct ospf_interface *oi = nbr->oi; | |
667 | struct ospf_area *vl_area = NULL; | |
668 | u_char old_state; | |
669 | int x; | |
670 | int force = 1; | |
671 | ||
672 | /* Logging change of status. */ | |
673 | if (IS_DEBUG_OSPF (nsm, NSM_STATUS)) | |
674 | zlog_debug ("NSM[%s:%s]: State change %s -> %s", | |
675 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id), | |
676 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
677 | LOOKUP (ospf_nsm_state_msg, state)); | |
678 | ||
679 | /* Preserve old status. */ | |
680 | old_state = nbr->state; | |
681 | ||
682 | /* Change to new status. */ | |
683 | nbr->state = state; | |
684 | ||
685 | /* Statistics. */ | |
686 | nbr->state_change++; | |
687 | ||
688 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
689 | vl_area = ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id); | |
690 | ||
691 | /* Optionally notify about adjacency changes */ | |
692 | if (CHECK_FLAG(oi->ospf->config, OSPF_LOG_ADJACENCY_CHANGES) && | |
693 | (old_state != state) && | |
694 | (CHECK_FLAG(oi->ospf->config, OSPF_LOG_ADJACENCY_DETAIL) || | |
695 | (state == NSM_Full) || (state < old_state))) | |
696 | zlog_notice("AdjChg: Nbr %s on %s: %s -> %s", | |
697 | inet_ntoa (nbr->router_id), IF_NAME (nbr->oi), | |
698 | LOOKUP (ospf_nsm_state_msg, old_state), | |
699 | LOOKUP (ospf_nsm_state_msg, state)); | |
700 | ||
701 | #ifdef HAVE_SNMP | |
702 | /* Terminal state or regression */ | |
703 | if ((state == NSM_Full) || (state == NSM_TwoWay) || (state < old_state)) | |
704 | { | |
705 | /* ospfVirtNbrStateChange */ | |
706 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
707 | ospfTrapVirtNbrStateChange(nbr); | |
708 | /* ospfNbrStateChange trap */ | |
709 | else | |
710 | /* To/From FULL, only managed by DR */ | |
711 | if (((state != NSM_Full) && (old_state != NSM_Full)) || | |
712 | (oi->state == ISM_DR)) | |
713 | ospfTrapNbrStateChange(nbr); | |
714 | } | |
715 | #endif | |
716 | ||
717 | /* One of the neighboring routers changes to/from the FULL state. */ | |
718 | if ((old_state != NSM_Full && state == NSM_Full) || | |
719 | (old_state == NSM_Full && state != NSM_Full)) | |
720 | { | |
721 | if (state == NSM_Full) | |
722 | { | |
723 | oi->full_nbrs++; | |
724 | oi->area->full_nbrs++; | |
725 | ||
726 | ospf_check_abr_status (oi->ospf); | |
727 | ||
728 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area) | |
729 | if (++vl_area->full_vls == 1) | |
730 | ospf_schedule_abr_task (oi->ospf); | |
731 | ||
732 | /* kevinm: refresh any redistributions */ | |
733 | for (x = ZEBRA_ROUTE_SYSTEM; x < ZEBRA_ROUTE_MAX; x++) | |
734 | { | |
735 | if (x == ZEBRA_ROUTE_OSPF || x == ZEBRA_ROUTE_OSPF6) | |
736 | continue; | |
737 | ospf_external_lsa_refresh_type (oi->ospf, x, force); | |
738 | } | |
739 | } | |
740 | else | |
741 | { | |
742 | oi->full_nbrs--; | |
743 | oi->area->full_nbrs--; | |
744 | ||
745 | ospf_check_abr_status (oi->ospf); | |
746 | ||
747 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area) | |
748 | if (vl_area->full_vls > 0) | |
749 | if (--vl_area->full_vls == 0) | |
750 | ospf_schedule_abr_task (oi->ospf); | |
751 | ||
752 | /* clear neighbor retransmit list */ | |
753 | if (!ospf_ls_retransmit_isempty (nbr)) | |
754 | ospf_ls_retransmit_clear (nbr); | |
755 | } | |
756 | ||
757 | zlog_info ("nsm_change_state(%s, %s -> %s): " | |
758 | "scheduling new router-LSA origination", | |
759 | inet_ntoa (nbr->router_id), | |
760 | LOOKUP(ospf_nsm_state_msg, old_state), | |
761 | LOOKUP(ospf_nsm_state_msg, state)); | |
762 | ||
763 | ospf_router_lsa_timer_add (oi->area); | |
764 | ||
765 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
766 | { | |
767 | struct ospf_area *vl_area = | |
768 | ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id); | |
769 | ||
770 | if (vl_area) | |
771 | ospf_router_lsa_timer_add (vl_area); | |
772 | } | |
773 | ||
774 | /* Originate network-LSA. */ | |
775 | if (oi->state == ISM_DR) | |
776 | { | |
777 | if (oi->network_lsa_self && oi->full_nbrs == 0) | |
778 | { | |
779 | ospf_lsa_flush_area (oi->network_lsa_self, oi->area); | |
780 | ospf_lsa_unlock (oi->network_lsa_self); | |
781 | oi->network_lsa_self = NULL; | |
782 | OSPF_TIMER_OFF (oi->t_network_lsa_self); | |
783 | } | |
784 | else | |
785 | ospf_network_lsa_timer_add (oi); | |
786 | } | |
787 | } | |
788 | ||
789 | #ifdef HAVE_OPAQUE_LSA | |
790 | ospf_opaque_nsm_change (nbr, old_state); | |
791 | #endif /* HAVE_OPAQUE_LSA */ | |
792 | ||
793 | /* Start DD exchange protocol */ | |
794 | if (state == NSM_ExStart) | |
795 | { | |
796 | if (nbr->dd_seqnum == 0) | |
797 | nbr->dd_seqnum = time (NULL); | |
798 | else | |
799 | nbr->dd_seqnum++; | |
800 | ||
801 | nbr->dd_flags = OSPF_DD_FLAG_I|OSPF_DD_FLAG_M|OSPF_DD_FLAG_MS; | |
802 | ospf_db_desc_send (nbr); | |
803 | } | |
804 | ||
805 | /* clear cryptographic sequence number */ | |
806 | if (state == NSM_Down) | |
807 | nbr->crypt_seqnum = 0; | |
808 | ||
809 | /* Generete NeighborChange ISM event. */ | |
810 | #ifdef BUGGY_ISM_TRANSITION | |
811 | if ((old_state < NSM_TwoWay && state >= NSM_TwoWay) || | |
812 | (old_state >= NSM_TwoWay && state < NSM_TwoWay)) | |
813 | OSPF_ISM_EVENT_EXECUTE (oi, ISM_NeighborChange); | |
814 | #else /* BUGGY_ISM_TRANSITION */ | |
815 | switch (oi->state) { | |
816 | case ISM_DROther: | |
817 | case ISM_Backup: | |
818 | case ISM_DR: | |
819 | if ((old_state < NSM_TwoWay && state >= NSM_TwoWay) || | |
820 | (old_state >= NSM_TwoWay && state < NSM_TwoWay)) | |
821 | OSPF_ISM_EVENT_EXECUTE (oi, ISM_NeighborChange); | |
822 | break; | |
823 | default: | |
824 | /* ISM_PointToPoint -> ISM_Down, ISM_Loopback -> ISM_Down, etc. */ | |
825 | break; | |
826 | } | |
827 | #endif /* BUGGY_ISM_TRANSITION */ | |
828 | ||
829 | /* Performance hack. Send hello immideately when some neighbor enter | |
830 | Init state. This whay we decrease neighbor discovery time. Gleb.*/ | |
831 | if (state == NSM_Init) | |
832 | { | |
833 | OSPF_ISM_TIMER_OFF (oi->t_hello); | |
834 | OSPF_ISM_TIMER_MSEC_ON (oi->t_hello, ospf_hello_timer, 1); | |
835 | } | |
836 | ||
837 | /* Preserve old status? */ | |
838 | } | |
839 | ||
840 | /* Execute NSM event process. */ | |
841 | int | |
842 | ospf_nsm_event (struct thread *thread) | |
843 | { | |
844 | int event; | |
845 | int next_state; | |
846 | struct ospf_neighbor *nbr; | |
847 | struct in_addr router_id; | |
848 | int old_state; | |
849 | struct ospf_interface *oi; | |
850 | ||
851 | nbr = THREAD_ARG (thread); | |
852 | event = THREAD_VAL (thread); | |
853 | router_id = nbr->router_id; | |
854 | ||
855 | old_state = nbr->state; | |
856 | oi = nbr->oi ; | |
857 | ||
858 | /* Call function. */ | |
859 | next_state = (*(NSM [nbr->state][event].func))(nbr); | |
860 | ||
861 | /* When event is NSM_KillNbr or InactivityTimer, the neighbor is | |
862 | deleted. */ | |
863 | if (event == NSM_KillNbr || event == NSM_InactivityTimer) | |
864 | { | |
865 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) | |
866 | zlog_debug ("NSM[%s:%s]: neighbor deleted", | |
867 | IF_NAME (oi), inet_ntoa (router_id)); | |
868 | ||
869 | /* Timers are canceled in ospf_nbr_free, moreover we cannot call | |
870 | nsm_timer_set here because nbr is freed already!!!*/ | |
871 | /*nsm_timer_set (nbr);*/ | |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
876 | if (! next_state) | |
877 | next_state = NSM [nbr->state][event].next_state; | |
878 | else if (NSM [nbr->state][event].next_state != NSM_DependUpon) | |
879 | { | |
880 | /* There's a mismatch between the FSM tables and what an FSM | |
881 | * action/state-change function returned. State changes which | |
882 | * do not have conditional/DependUpon next-states should not | |
883 | * try set next_state. | |
884 | */ | |
885 | zlog_warn ("NSM[%s:%s]: %s (%s): " | |
886 | "Warning: action tried to change next_state to %s", | |
887 | IF_NAME (oi), inet_ntoa (nbr->router_id), | |
888 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
889 | ospf_nsm_event_str [event], | |
890 | LOOKUP (ospf_nsm_state_msg, next_state)); | |
891 | ||
892 | next_state = NSM [nbr->state][event].next_state; | |
893 | } | |
894 | ||
895 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) | |
896 | zlog_debug ("NSM[%s:%s]: %s (%s)", IF_NAME (oi), | |
897 | inet_ntoa (nbr->router_id), | |
898 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
899 | ospf_nsm_event_str [event]); | |
900 | ||
901 | /* If state is changed. */ | |
902 | if (next_state != nbr->state) | |
903 | nsm_change_state (nbr, next_state); | |
904 | ||
905 | /* Make sure timer is set. */ | |
906 | nsm_timer_set (nbr); | |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
911 | /* Check loading state. */ | |
912 | void | |
913 | ospf_check_nbr_loading (struct ospf_neighbor *nbr) | |
914 | { | |
915 | if (nbr->state == NSM_Loading) | |
916 | { | |
917 | if (ospf_ls_request_isempty (nbr)) | |
918 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_LoadingDone); | |
919 | else if (nbr->ls_req_last == NULL) | |
920 | ospf_ls_req_event (nbr); | |
921 | } | |
922 | } |