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2d59836a | 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" | |
5e4914c3 | 50 | #include "ospfd/ospf_snmp.h" |
2d59836a | 51 | |
d1b1cd8f | 52 | static void nsm_clear_adj (struct ospf_neighbor *); |
6b0655a2 | 53 | |
2d59836a | 54 | /* OSPF NSM Timer functions. */ |
4dadc291 | 55 | static int |
2d59836a | 56 | ospf_inactivity_timer (struct thread *thread) |
57 | { | |
58 | struct ospf_neighbor *nbr; | |
59 | ||
60 | nbr = THREAD_ARG (thread); | |
61 | nbr->t_inactivity = NULL; | |
62 | ||
63 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
64 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Inactivity timer expire)", | |
65 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); | |
66 | ||
67 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_InactivityTimer); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
4dadc291 | 72 | static int |
2d59836a | 73 | ospf_db_desc_timer (struct thread *thread) |
74 | { | |
2d59836a | 75 | struct ospf_neighbor *nbr; |
76 | ||
77 | nbr = THREAD_ARG (thread); | |
78 | nbr->t_db_desc = NULL; | |
79 | ||
2d59836a | 80 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) |
2a42e285 | 81 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (DD Retransmit timer expire)", |
2d59836a | 82 | IF_NAME (nbr->oi), inet_ntoa (nbr->src)); |
83 | ||
84 | /* resent last send DD packet. */ | |
85 | assert (nbr->last_send); | |
86 | ospf_db_desc_resend (nbr); | |
87 | ||
88 | /* DD Retransmit timer set. */ | |
89 | OSPF_NSM_TIMER_ON (nbr->t_db_desc, ospf_db_desc_timer, nbr->v_db_desc); | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
1f2c2743 PJ |
94 | /* Hook function called after ospf NSM event is occured. |
95 | * | |
96 | * Set/clear any timers whose condition is implicit to the neighbour | |
97 | * state. There may be other timers which are set/unset according to other | |
98 | * state. | |
99 | * | |
100 | * We rely on this function to properly clear timers in lower states, | |
101 | * particularly before deleting a neighbour. | |
102 | */ | |
4dadc291 | 103 | static void |
2d59836a | 104 | nsm_timer_set (struct ospf_neighbor *nbr) |
105 | { | |
106 | switch (nbr->state) | |
107 | { | |
1f2c2743 | 108 | case NSM_Deleted: |
2d59836a | 109 | case NSM_Down: |
e55dd53b | 110 | OSPF_NSM_TIMER_OFF (nbr->t_inactivity); |
1f2c2743 | 111 | OSPF_NSM_TIMER_OFF (nbr->t_hello_reply); |
2d59836a | 112 | case NSM_Attempt: |
2d59836a | 113 | case NSM_Init: |
2d59836a | 114 | case NSM_TwoWay: |
115 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
116 | OSPF_NSM_TIMER_OFF (nbr->t_ls_upd); | |
e55dd53b | 117 | OSPF_NSM_TIMER_OFF (nbr->t_ls_req); |
2d59836a | 118 | break; |
119 | case NSM_ExStart: | |
120 | OSPF_NSM_TIMER_ON (nbr->t_db_desc, ospf_db_desc_timer, nbr->v_db_desc); | |
121 | OSPF_NSM_TIMER_OFF (nbr->t_ls_upd); | |
e55dd53b | 122 | OSPF_NSM_TIMER_OFF (nbr->t_ls_req); |
2d59836a | 123 | break; |
124 | case NSM_Exchange: | |
125 | OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
126 | if (!IS_SET_DD_MS (nbr->dd_flags)) | |
127 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
128 | break; | |
129 | case NSM_Loading: | |
2d59836a | 130 | case NSM_Full: |
2d59836a | 131 | default: |
132 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
133 | break; | |
134 | } | |
135 | } | |
136 | ||
d7b0fb62 PJ |
137 | /* 10.4 of RFC2328, indicate whether an adjacency is appropriate with |
138 | * the given neighbour | |
139 | */ | |
140 | static int | |
141 | nsm_should_adj (struct ospf_neighbor *nbr) | |
142 | { | |
f7a76abf | 143 | struct ospf_interface *oi = nbr->oi; |
d7b0fb62 | 144 | |
f7a76abf | 145 | /* These network types must always form adjacencies. */ |
d7b0fb62 PJ |
146 | if (oi->type == OSPF_IFTYPE_POINTOPOINT |
147 | || oi->type == OSPF_IFTYPE_POINTOMULTIPOINT | |
f7a76abf PJ |
148 | || oi->type == OSPF_IFTYPE_VIRTUALLINK |
149 | /* Router itself is the DRouter or the BDRouter. */ | |
150 | || IPV4_ADDR_SAME (&oi->address->u.prefix4, &DR (oi)) | |
151 | || IPV4_ADDR_SAME (&oi->address->u.prefix4, &BDR (oi)) | |
152 | /* Neighboring Router is the DRouter or the BDRouter. */ | |
153 | || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &DR (oi)) | |
d7b0fb62 PJ |
154 | || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &BDR (oi))) |
155 | return 1; | |
156 | ||
157 | return 0; | |
158 | } | |
6b0655a2 | 159 | |
2d59836a | 160 | /* OSPF NSM functions. */ |
4dadc291 | 161 | static int |
57c5c652 | 162 | nsm_packet_received (struct ospf_neighbor *nbr) |
2d59836a | 163 | { |
164 | /* Start or Restart Inactivity Timer. */ | |
165 | OSPF_NSM_TIMER_OFF (nbr->t_inactivity); | |
166 | ||
167 | OSPF_NSM_TIMER_ON (nbr->t_inactivity, ospf_inactivity_timer, | |
168 | nbr->v_inactivity); | |
169 | ||
170 | if (nbr->oi->type == OSPF_IFTYPE_NBMA && nbr->nbr_nbma) | |
171 | OSPF_POLL_TIMER_OFF (nbr->nbr_nbma->t_poll); | |
172 | ||
8b6912c2 DS |
173 | /* Send proactive ARP requests */ |
174 | if (nbr->state < NSM_Exchange) | |
175 | ospf_proactively_arp (nbr); | |
176 | ||
2d59836a | 177 | return 0; |
178 | } | |
179 | ||
4dadc291 | 180 | static int |
2d59836a | 181 | nsm_start (struct ospf_neighbor *nbr) |
182 | { | |
2d59836a | 183 | if (nbr->nbr_nbma) |
184 | OSPF_POLL_TIMER_OFF (nbr->nbr_nbma->t_poll); | |
185 | ||
186 | OSPF_NSM_TIMER_OFF (nbr->t_inactivity); | |
187 | ||
188 | OSPF_NSM_TIMER_ON (nbr->t_inactivity, ospf_inactivity_timer, | |
189 | nbr->v_inactivity); | |
190 | ||
8b6912c2 DS |
191 | /* Send proactive ARP requests */ |
192 | ospf_proactively_arp (nbr); | |
193 | ||
2d59836a | 194 | return 0; |
195 | } | |
196 | ||
4dadc291 | 197 | static int |
2d59836a | 198 | nsm_twoway_received (struct ospf_neighbor *nbr) |
199 | { | |
8b6912c2 DS |
200 | int adj = nsm_should_adj (nbr); |
201 | ||
202 | /* Send proactive ARP requests */ | |
203 | if (adj) | |
204 | ospf_proactively_arp (nbr); | |
205 | ||
206 | return (adj ? NSM_ExStart : NSM_TwoWay); | |
2d59836a | 207 | } |
208 | ||
209 | int | |
210 | ospf_db_summary_count (struct ospf_neighbor *nbr) | |
211 | { | |
212 | return ospf_lsdb_count_all (&nbr->db_sum); | |
213 | } | |
214 | ||
215 | int | |
216 | ospf_db_summary_isempty (struct ospf_neighbor *nbr) | |
217 | { | |
218 | return ospf_lsdb_isempty (&nbr->db_sum); | |
219 | } | |
220 | ||
4dadc291 | 221 | static int |
68980084 | 222 | ospf_db_summary_add (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) |
2d59836a | 223 | { |
09e4efdc | 224 | #ifdef HAVE_OPAQUE_LSA |
225 | switch (lsa->data->type) | |
226 | { | |
227 | case OSPF_OPAQUE_LINK_LSA: | |
228 | /* Exclude type-9 LSAs that does not have the same "oi" with "nbr". */ | |
d71ea652 | 229 | if (nbr->oi && ospf_if_exists (lsa->oi) != nbr->oi) |
09e4efdc | 230 | return 0; |
231 | break; | |
232 | case OSPF_OPAQUE_AREA_LSA: | |
233 | /* | |
234 | * It is assured by the caller function "nsm_negotiation_done()" | |
235 | * that every given LSA belongs to the same area with "nbr". | |
236 | */ | |
237 | break; | |
238 | case OSPF_OPAQUE_AS_LSA: | |
239 | default: | |
240 | break; | |
241 | } | |
242 | #endif /* HAVE_OPAQUE_LSA */ | |
243 | ||
2d59836a | 244 | /* Stay away from any Local Translated Type-7 LSAs */ |
245 | if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
246 | return 0; | |
2d59836a | 247 | |
248 | if (IS_LSA_MAXAGE (lsa)) | |
249 | ospf_ls_retransmit_add (nbr, lsa); | |
250 | else | |
251 | ospf_lsdb_add (&nbr->db_sum, lsa); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | void | |
257 | ospf_db_summary_clear (struct ospf_neighbor *nbr) | |
258 | { | |
259 | struct ospf_lsdb *lsdb; | |
260 | int i; | |
261 | ||
262 | lsdb = &nbr->db_sum; | |
263 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
264 | { | |
265 | struct route_table *table = lsdb->type[i].db; | |
266 | struct route_node *rn; | |
267 | ||
268 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
269 | if (rn->info) | |
270 | ospf_lsdb_delete (&nbr->db_sum, rn->info); | |
271 | } | |
272 | } | |
273 | ||
6b0655a2 | 274 | |
2d59836a | 275 | |
2d59836a | 276 | /* The area link state database consists of the router-LSAs, |
277 | network-LSAs and summary-LSAs contained in the area structure, | |
68980084 | 278 | along with the AS-external-LSAs contained in the global structure. |
279 | AS-external-LSAs are omitted from a virtual neighbor's Database | |
2d59836a | 280 | summary list. AS-external-LSAs are omitted from the Database |
281 | summary list if the area has been configured as a stub. */ | |
4dadc291 | 282 | static int |
2d59836a | 283 | nsm_negotiation_done (struct ospf_neighbor *nbr) |
284 | { | |
68980084 | 285 | struct ospf_area *area = nbr->oi->area; |
286 | struct ospf_lsa *lsa; | |
287 | struct route_node *rn; | |
288 | ||
8b6912c2 DS |
289 | /* Send proactive ARP requests */ |
290 | ospf_proactively_arp (nbr); | |
291 | ||
68980084 | 292 | LSDB_LOOP (ROUTER_LSDB (area), rn, lsa) |
293 | ospf_db_summary_add (nbr, lsa); | |
294 | LSDB_LOOP (NETWORK_LSDB (area), rn, lsa) | |
295 | ospf_db_summary_add (nbr, lsa); | |
296 | LSDB_LOOP (SUMMARY_LSDB (area), rn, lsa) | |
297 | ospf_db_summary_add (nbr, lsa); | |
298 | LSDB_LOOP (ASBR_SUMMARY_LSDB (area), rn, lsa) | |
299 | ospf_db_summary_add (nbr, lsa); | |
2d59836a | 300 | |
2d59836a | 301 | #ifdef HAVE_OPAQUE_LSA |
302 | /* Process only if the neighbor is opaque capable. */ | |
303 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
304 | { | |
68980084 | 305 | LSDB_LOOP (OPAQUE_LINK_LSDB (area), rn, lsa) |
306 | ospf_db_summary_add (nbr, lsa); | |
307 | LSDB_LOOP (OPAQUE_AREA_LSDB (area), rn, lsa) | |
308 | ospf_db_summary_add (nbr, lsa); | |
2d59836a | 309 | } |
310 | #endif /* HAVE_OPAQUE_LSA */ | |
311 | ||
f4833e9f | 312 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_NP)) |
313 | { | |
314 | LSDB_LOOP (NSSA_LSDB (area), rn, lsa) | |
315 | ospf_db_summary_add (nbr, lsa); | |
316 | } | |
317 | ||
68980084 | 318 | if (nbr->oi->type != OSPF_IFTYPE_VIRTUALLINK |
319 | && area->external_routing == OSPF_AREA_DEFAULT) | |
320 | LSDB_LOOP (EXTERNAL_LSDB (nbr->oi->ospf), rn, lsa) | |
321 | ospf_db_summary_add (nbr, lsa); | |
2d59836a | 322 | |
323 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 324 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O) |
325 | && (nbr->oi->type != OSPF_IFTYPE_VIRTUALLINK | |
326 | && area->external_routing == OSPF_AREA_DEFAULT)) | |
327 | LSDB_LOOP (OPAQUE_AS_LSDB (nbr->oi->ospf), rn, lsa) | |
328 | ospf_db_summary_add (nbr, lsa); | |
2d59836a | 329 | #endif /* HAVE_OPAQUE_LSA */ |
330 | ||
2d59836a | 331 | return 0; |
332 | } | |
333 | ||
4dadc291 | 334 | static int |
2d59836a | 335 | nsm_exchange_done (struct ospf_neighbor *nbr) |
336 | { | |
2d59836a | 337 | if (ospf_ls_request_isempty (nbr)) |
338 | return NSM_Full; | |
339 | ||
2d59836a | 340 | /* Send Link State Request. */ |
341 | ospf_ls_req_send (nbr); | |
342 | ||
343 | return NSM_Loading; | |
344 | } | |
345 | ||
4dadc291 | 346 | static int |
2d59836a | 347 | nsm_adj_ok (struct ospf_neighbor *nbr) |
348 | { | |
d7b0fb62 PJ |
349 | int next_state = nbr->state; |
350 | int adj = nsm_should_adj (nbr); | |
2d59836a | 351 | |
d7b0fb62 | 352 | if (nbr->state == NSM_TwoWay && adj == 1) |
8b6912c2 DS |
353 | { |
354 | next_state = NSM_ExStart; | |
355 | ||
356 | /* Send proactive ARP requests */ | |
357 | ospf_proactively_arp (nbr); | |
358 | } | |
d7b0fb62 | 359 | else if (nbr->state >= NSM_ExStart && adj == 0) |
2d59836a | 360 | next_state = NSM_TwoWay; |
361 | ||
362 | return next_state; | |
363 | } | |
364 | ||
d1b1cd8f PJ |
365 | /* Clear adjacency related state for a neighbour, intended where nbr |
366 | * transitions from > ExStart (i.e. a Full or forming adjacency) | |
367 | * to <= ExStart. | |
368 | */ | |
369 | static void | |
370 | nsm_clear_adj (struct ospf_neighbor *nbr) | |
2d59836a | 371 | { |
372 | /* Clear Database Summary list. */ | |
373 | if (!ospf_db_summary_isempty (nbr)) | |
374 | ospf_db_summary_clear (nbr); | |
375 | ||
376 | /* Clear Link State Request list. */ | |
377 | if (!ospf_ls_request_isempty (nbr)) | |
378 | ospf_ls_request_delete_all (nbr); | |
379 | ||
380 | /* Clear Link State Retransmission list. */ | |
381 | if (!ospf_ls_retransmit_isempty (nbr)) | |
382 | ospf_ls_retransmit_clear (nbr); | |
2d59836a | 383 | |
384 | #ifdef HAVE_OPAQUE_LSA | |
385 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
386 | UNSET_FLAG (nbr->options, OSPF_OPTION_O); | |
387 | #endif /* HAVE_OPAQUE_LSA */ | |
388 | } | |
389 | ||
4dadc291 | 390 | static int |
2d59836a | 391 | nsm_kill_nbr (struct ospf_neighbor *nbr) |
392 | { | |
478aab98 | 393 | /* killing nbr_self is invalid */ |
478aab98 | 394 | if (nbr == nbr->oi->nbr_self) |
1f2c2743 PJ |
395 | { |
396 | assert (nbr != nbr->oi->nbr_self); | |
397 | return 0; | |
398 | } | |
478aab98 | 399 | |
2d59836a | 400 | if (nbr->oi->type == OSPF_IFTYPE_NBMA && nbr->nbr_nbma != NULL) |
401 | { | |
402 | struct ospf_nbr_nbma *nbr_nbma = nbr->nbr_nbma; | |
403 | ||
404 | nbr_nbma->nbr = NULL; | |
405 | nbr_nbma->state_change = nbr->state_change; | |
406 | ||
407 | nbr->nbr_nbma = NULL; | |
408 | ||
409 | OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, | |
410 | nbr_nbma->v_poll); | |
411 | ||
412 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) | |
2a42e285 | 413 | zlog_debug ("NSM[%s:%s]: Down (PollIntervalTimer scheduled)", |
2d59836a | 414 | IF_NAME (nbr->oi), inet_ntoa (nbr->address.u.prefix4)); |
415 | } | |
416 | ||
2d59836a | 417 | return 0; |
418 | } | |
419 | ||
2d59836a | 420 | /* Neighbor State Machine */ |
421 | struct { | |
4dadc291 | 422 | int (*func) (struct ospf_neighbor *); |
2d59836a | 423 | int next_state; |
424 | } NSM [OSPF_NSM_STATE_MAX][OSPF_NSM_EVENT_MAX] = | |
425 | { | |
426 | { | |
427 | /* DependUpon: dummy state. */ | |
539e1523 | 428 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 429 | { NULL, NSM_DependUpon }, /* PacketReceived */ |
539e1523 PJ |
430 | { NULL, NSM_DependUpon }, /* Start */ |
431 | { NULL, NSM_DependUpon }, /* 2-WayReceived */ | |
432 | { NULL, NSM_DependUpon }, /* NegotiationDone */ | |
433 | { NULL, NSM_DependUpon }, /* ExchangeDone */ | |
434 | { NULL, NSM_DependUpon }, /* BadLSReq */ | |
435 | { NULL, NSM_DependUpon }, /* LoadingDone */ | |
436 | { NULL, NSM_DependUpon }, /* AdjOK? */ | |
437 | { NULL, NSM_DependUpon }, /* SeqNumberMismatch */ | |
438 | { NULL, NSM_DependUpon }, /* 1-WayReceived */ | |
439 | { NULL, NSM_DependUpon }, /* KillNbr */ | |
440 | { NULL, NSM_DependUpon }, /* InactivityTimer */ | |
441 | { NULL, NSM_DependUpon }, /* LLDown */ | |
2d59836a | 442 | }, |
1f2c2743 PJ |
443 | { |
444 | /* Deleted: dummy state. */ | |
539e1523 | 445 | { NULL, NSM_Deleted }, /* NoEvent */ |
57c5c652 | 446 | { NULL, NSM_Deleted }, /* PacketReceived */ |
539e1523 PJ |
447 | { NULL, NSM_Deleted }, /* Start */ |
448 | { NULL, NSM_Deleted }, /* 2-WayReceived */ | |
449 | { NULL, NSM_Deleted }, /* NegotiationDone */ | |
450 | { NULL, NSM_Deleted }, /* ExchangeDone */ | |
451 | { NULL, NSM_Deleted }, /* BadLSReq */ | |
452 | { NULL, NSM_Deleted }, /* LoadingDone */ | |
453 | { NULL, NSM_Deleted }, /* AdjOK? */ | |
454 | { NULL, NSM_Deleted }, /* SeqNumberMismatch */ | |
455 | { NULL, NSM_Deleted }, /* 1-WayReceived */ | |
456 | { NULL, NSM_Deleted }, /* KillNbr */ | |
457 | { NULL, NSM_Deleted }, /* InactivityTimer */ | |
458 | { NULL, NSM_Deleted }, /* LLDown */ | |
1f2c2743 | 459 | }, |
2d59836a | 460 | { |
461 | /* Down: */ | |
539e1523 | 462 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 463 | { nsm_packet_received, NSM_Init }, /* PacketReceived */ |
2d59836a | 464 | { nsm_start, NSM_Attempt }, /* Start */ |
539e1523 PJ |
465 | { NULL, NSM_Down }, /* 2-WayReceived */ |
466 | { NULL, NSM_Down }, /* NegotiationDone */ | |
467 | { NULL, NSM_Down }, /* ExchangeDone */ | |
468 | { NULL, NSM_Down }, /* BadLSReq */ | |
469 | { NULL, NSM_Down }, /* LoadingDone */ | |
470 | { NULL, NSM_Down }, /* AdjOK? */ | |
471 | { NULL, NSM_Down }, /* SeqNumberMismatch */ | |
472 | { NULL, NSM_Down }, /* 1-WayReceived */ | |
1f2c2743 | 473 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
474 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
475 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 476 | }, |
477 | { | |
478 | /* Attempt: */ | |
539e1523 | 479 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 480 | { nsm_packet_received, NSM_Init }, /* PacketReceived */ |
539e1523 PJ |
481 | { NULL, NSM_Attempt }, /* Start */ |
482 | { NULL, NSM_Attempt }, /* 2-WayReceived */ | |
483 | { NULL, NSM_Attempt }, /* NegotiationDone */ | |
484 | { NULL, NSM_Attempt }, /* ExchangeDone */ | |
485 | { NULL, NSM_Attempt }, /* BadLSReq */ | |
486 | { NULL, NSM_Attempt }, /* LoadingDone */ | |
487 | { NULL, NSM_Attempt }, /* AdjOK? */ | |
488 | { NULL, NSM_Attempt }, /* SeqNumberMismatch */ | |
489 | { NULL, NSM_Attempt }, /* 1-WayReceived */ | |
1f2c2743 | 490 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
491 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
492 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 493 | }, |
494 | { | |
495 | /* Init: */ | |
539e1523 | 496 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 497 | { nsm_packet_received, NSM_Init }, /* PacketReceived */ |
539e1523 | 498 | { NULL, NSM_Init }, /* Start */ |
2d59836a | 499 | { nsm_twoway_received, NSM_DependUpon }, /* 2-WayReceived */ |
539e1523 PJ |
500 | { NULL, NSM_Init }, /* NegotiationDone */ |
501 | { NULL, NSM_Init }, /* ExchangeDone */ | |
502 | { NULL, NSM_Init }, /* BadLSReq */ | |
503 | { NULL, NSM_Init }, /* LoadingDone */ | |
504 | { NULL, NSM_Init }, /* AdjOK? */ | |
505 | { NULL, NSM_Init }, /* SeqNumberMismatch */ | |
506 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 507 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
508 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
509 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 510 | }, |
511 | { | |
512 | /* 2-Way: */ | |
539e1523 | 513 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 514 | { nsm_packet_received, NSM_TwoWay }, /* HelloReceived */ |
539e1523 PJ |
515 | { NULL, NSM_TwoWay }, /* Start */ |
516 | { NULL, NSM_TwoWay }, /* 2-WayReceived */ | |
517 | { NULL, NSM_TwoWay }, /* NegotiationDone */ | |
518 | { NULL, NSM_TwoWay }, /* ExchangeDone */ | |
519 | { NULL, NSM_TwoWay }, /* BadLSReq */ | |
520 | { NULL, NSM_TwoWay }, /* LoadingDone */ | |
2d59836a | 521 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
522 | { NULL, NSM_TwoWay }, /* SeqNumberMismatch */ |
523 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 524 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
525 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
526 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 527 | }, |
528 | { | |
529 | /* ExStart: */ | |
539e1523 | 530 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 531 | { nsm_packet_received, NSM_ExStart }, /* PacaketReceived */ |
539e1523 PJ |
532 | { NULL, NSM_ExStart }, /* Start */ |
533 | { NULL, NSM_ExStart }, /* 2-WayReceived */ | |
2d59836a | 534 | { nsm_negotiation_done, NSM_Exchange }, /* NegotiationDone */ |
539e1523 PJ |
535 | { NULL, NSM_ExStart }, /* ExchangeDone */ |
536 | { NULL, NSM_ExStart }, /* BadLSReq */ | |
537 | { NULL, NSM_ExStart }, /* LoadingDone */ | |
2d59836a | 538 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
539 | { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
540 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 541 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
542 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
543 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 544 | }, |
545 | { | |
546 | /* Exchange: */ | |
539e1523 | 547 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 548 | { nsm_packet_received, NSM_Exchange }, /* PacketReceived */ |
539e1523 PJ |
549 | { NULL, NSM_Exchange }, /* Start */ |
550 | { NULL, NSM_Exchange }, /* 2-WayReceived */ | |
551 | { NULL, NSM_Exchange }, /* NegotiationDone */ | |
2d59836a | 552 | { nsm_exchange_done, NSM_DependUpon }, /* ExchangeDone */ |
539e1523 PJ |
553 | { NULL, NSM_ExStart }, /* BadLSReq */ |
554 | { NULL, NSM_Exchange }, /* LoadingDone */ | |
2d59836a | 555 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
556 | { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
557 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 558 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
559 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
560 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 561 | }, |
562 | { | |
563 | /* Loading: */ | |
539e1523 | 564 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 565 | { nsm_packet_received, NSM_Loading }, /* PacketReceived */ |
539e1523 PJ |
566 | { NULL, NSM_Loading }, /* Start */ |
567 | { NULL, NSM_Loading }, /* 2-WayReceived */ | |
568 | { NULL, NSM_Loading }, /* NegotiationDone */ | |
569 | { NULL, NSM_Loading }, /* ExchangeDone */ | |
570 | { NULL, NSM_ExStart }, /* BadLSReq */ | |
571 | { NULL, NSM_Full }, /* LoadingDone */ | |
2d59836a | 572 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
573 | { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
574 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 575 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
576 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
577 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 578 | }, |
579 | { /* Full: */ | |
539e1523 | 580 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 581 | { nsm_packet_received, NSM_Full }, /* PacketReceived */ |
539e1523 PJ |
582 | { NULL, NSM_Full }, /* Start */ |
583 | { NULL, NSM_Full }, /* 2-WayReceived */ | |
584 | { NULL, NSM_Full }, /* NegotiationDone */ | |
585 | { NULL, NSM_Full }, /* ExchangeDone */ | |
586 | { NULL, NSM_ExStart }, /* BadLSReq */ | |
587 | { NULL, NSM_Full }, /* LoadingDone */ | |
2d59836a | 588 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
589 | { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
590 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 591 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
592 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
593 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 594 | }, |
595 | }; | |
596 | ||
30a2231a | 597 | static const char *ospf_nsm_event_str[] = |
2d59836a | 598 | { |
599 | "NoEvent", | |
57c5c652 | 600 | "PacketReceived", |
2d59836a | 601 | "Start", |
602 | "2-WayReceived", | |
603 | "NegotiationDone", | |
604 | "ExchangeDone", | |
605 | "BadLSReq", | |
606 | "LoadingDone", | |
607 | "AdjOK?", | |
608 | "SeqNumberMismatch", | |
609 | "1-WayReceived", | |
610 | "KillNbr", | |
611 | "InactivityTimer", | |
612 | "LLDown", | |
613 | }; | |
614 | ||
3d63f380 PJ |
615 | static void |
616 | nsm_notice_state_change (struct ospf_neighbor *nbr, int next_state, int event) | |
617 | { | |
618 | /* Logging change of status. */ | |
619 | if (IS_DEBUG_OSPF (nsm, NSM_STATUS)) | |
620 | zlog_debug ("NSM[%s:%s]: State change %s -> %s (%s)", | |
621 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id), | |
622 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
623 | LOOKUP (ospf_nsm_state_msg, next_state), | |
624 | ospf_nsm_event_str [event]); | |
625 | ||
626 | /* Optionally notify about adjacency changes */ | |
627 | if (CHECK_FLAG(nbr->oi->ospf->config, OSPF_LOG_ADJACENCY_CHANGES) && | |
628 | (CHECK_FLAG(nbr->oi->ospf->config, OSPF_LOG_ADJACENCY_DETAIL) || | |
629 | (next_state == NSM_Full) || (next_state < nbr->state))) | |
630 | zlog_notice("AdjChg: Nbr %s on %s: %s -> %s (%s)", | |
631 | inet_ntoa (nbr->router_id), IF_NAME (nbr->oi), | |
632 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
633 | LOOKUP (ospf_nsm_state_msg, next_state), | |
634 | ospf_nsm_event_str [event]); | |
635 | ||
3fed4160 PJ |
636 | /* Advance in NSM */ |
637 | if (next_state > nbr->state) | |
2518efd1 | 638 | nbr->ts_last_progress = recent_relative_time (); |
3fed4160 PJ |
639 | else /* regression in NSM */ |
640 | { | |
2518efd1 | 641 | nbr->ts_last_regress = recent_relative_time (); |
3fed4160 PJ |
642 | nbr->last_regress_str = ospf_nsm_event_str [event]; |
643 | } | |
90c33177 | 644 | |
3d63f380 PJ |
645 | #ifdef HAVE_SNMP |
646 | /* Terminal state or regression */ | |
647 | if ((next_state == NSM_Full) | |
648 | || (next_state == NSM_TwoWay) | |
649 | || (next_state < nbr->state)) | |
650 | { | |
651 | /* ospfVirtNbrStateChange */ | |
652 | if (nbr->oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
653 | ospfTrapVirtNbrStateChange(nbr); | |
654 | /* ospfNbrStateChange trap */ | |
655 | else | |
656 | /* To/From FULL, only managed by DR */ | |
657 | if (((next_state != NSM_Full) && (nbr->state != NSM_Full)) | |
658 | || (nbr->oi->state == ISM_DR)) | |
659 | ospfTrapNbrStateChange(nbr); | |
660 | } | |
661 | #endif | |
662 | } | |
663 | ||
de54b26c | 664 | static void |
2d59836a | 665 | nsm_change_state (struct ospf_neighbor *nbr, int state) |
666 | { | |
68980084 | 667 | struct ospf_interface *oi = nbr->oi; |
2d59836a | 668 | struct ospf_area *vl_area = NULL; |
669 | u_char old_state; | |
670 | int x; | |
671 | int force = 1; | |
672 | ||
2d59836a | 673 | /* Preserve old status. */ |
674 | old_state = nbr->state; | |
675 | ||
676 | /* Change to new status. */ | |
677 | nbr->state = state; | |
678 | ||
679 | /* Statistics. */ | |
680 | nbr->state_change++; | |
681 | ||
2d59836a | 682 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) |
68980084 | 683 | vl_area = ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id); |
d7e60dd7 | 684 | |
7a9d983e CF |
685 | /* Generate NeighborChange ISM event. |
686 | * | |
687 | * In response to NeighborChange, DR election is rerun. The information | |
688 | * from the election process is required by the router-lsa construction. | |
689 | * | |
690 | * Therefore, trigger the event prior to refreshing the LSAs. */ | |
691 | switch (oi->state) { | |
692 | case ISM_DROther: | |
693 | case ISM_Backup: | |
694 | case ISM_DR: | |
695 | if ((old_state < NSM_TwoWay && state >= NSM_TwoWay) || | |
696 | (old_state >= NSM_TwoWay && state < NSM_TwoWay)) | |
697 | OSPF_ISM_EVENT_EXECUTE (oi, ISM_NeighborChange); | |
698 | break; | |
699 | default: | |
700 | /* ISM_PointToPoint -> ISM_Down, ISM_Loopback -> ISM_Down, etc. */ | |
701 | break; | |
702 | } | |
703 | ||
2d59836a | 704 | /* One of the neighboring routers changes to/from the FULL state. */ |
705 | if ((old_state != NSM_Full && state == NSM_Full) || | |
706 | (old_state == NSM_Full && state != NSM_Full)) | |
3aa8d5f9 | 707 | { |
2d59836a | 708 | if (state == NSM_Full) |
709 | { | |
710 | oi->full_nbrs++; | |
711 | oi->area->full_nbrs++; | |
712 | ||
68980084 | 713 | ospf_check_abr_status (oi->ospf); |
2d59836a | 714 | |
715 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area) | |
716 | if (++vl_area->full_vls == 1) | |
68980084 | 717 | ospf_schedule_abr_task (oi->ospf); |
2d59836a | 718 | |
719 | /* kevinm: refresh any redistributions */ | |
68980084 | 720 | for (x = ZEBRA_ROUTE_SYSTEM; x < ZEBRA_ROUTE_MAX; x++) |
721 | { | |
7c8ff89e DS |
722 | struct list *red_list; |
723 | struct listnode *node; | |
724 | struct ospf_redist *red; | |
725 | ||
726 | if (x == ZEBRA_ROUTE_OSPF6) | |
727 | continue; | |
728 | ||
729 | red_list = oi->ospf->redist[x]; | |
730 | if (!red_list) | |
731 | continue; | |
732 | ||
733 | for (ALL_LIST_ELEMENTS_RO(red_list, node, red)) | |
734 | ospf_external_lsa_refresh_type (oi->ospf, x, red->instance, force); | |
68980084 | 735 | } |
9fd4958a DN |
736 | /* XXX: Clearly some thing is wrong with refresh of external LSAs |
737 | * this added to hack around defaults not refreshing after a timer | |
738 | * jump. | |
739 | */ | |
740 | ospf_external_lsa_refresh_default (oi->ospf); | |
2d59836a | 741 | } |
742 | else | |
743 | { | |
744 | oi->full_nbrs--; | |
745 | oi->area->full_nbrs--; | |
746 | ||
68980084 | 747 | ospf_check_abr_status (oi->ospf); |
2d59836a | 748 | |
749 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area) | |
750 | if (vl_area->full_vls > 0) | |
751 | if (--vl_area->full_vls == 0) | |
68980084 | 752 | ospf_schedule_abr_task (oi->ospf); |
2d59836a | 753 | } |
754 | ||
3aa8d5f9 | 755 | zlog_info ("nsm_change_state(%s, %s -> %s): " |
756 | "scheduling new router-LSA origination", | |
757 | inet_ntoa (nbr->router_id), | |
758 | LOOKUP(ospf_nsm_state_msg, old_state), | |
759 | LOOKUP(ospf_nsm_state_msg, state)); | |
2d59836a | 760 | |
c363d386 | 761 | ospf_router_lsa_update_area (oi->area); |
2d59836a | 762 | |
763 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
764 | { | |
765 | struct ospf_area *vl_area = | |
68980084 | 766 | ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id); |
2d59836a | 767 | |
768 | if (vl_area) | |
c363d386 | 769 | ospf_router_lsa_update_area (vl_area); |
2d59836a | 770 | } |
771 | ||
772 | /* Originate network-LSA. */ | |
773 | if (oi->state == ISM_DR) | |
774 | { | |
775 | if (oi->network_lsa_self && oi->full_nbrs == 0) | |
776 | { | |
777 | ospf_lsa_flush_area (oi->network_lsa_self, oi->area); | |
1fe6ed38 | 778 | ospf_lsa_unlock (&oi->network_lsa_self); |
2d59836a | 779 | oi->network_lsa_self = NULL; |
2d59836a | 780 | } |
781 | else | |
c363d386 | 782 | ospf_network_lsa_update (oi); |
2d59836a | 783 | } |
784 | } | |
785 | ||
786 | #ifdef HAVE_OPAQUE_LSA | |
787 | ospf_opaque_nsm_change (nbr, old_state); | |
788 | #endif /* HAVE_OPAQUE_LSA */ | |
789 | ||
d1b1cd8f PJ |
790 | /* State changes from > ExStart to <= ExStart should clear any Exchange |
791 | * or Full/LSA Update related lists and state. | |
792 | * Potential causal events: BadLSReq, SeqNumberMismatch, AdjOK? | |
d1b1cd8f | 793 | */ |
539e1523 | 794 | if ((old_state > NSM_ExStart) && (state <= NSM_ExStart)) |
d1b1cd8f PJ |
795 | nsm_clear_adj (nbr); |
796 | ||
2d59836a | 797 | /* Start DD exchange protocol */ |
798 | if (state == NSM_ExStart) | |
799 | { | |
800 | if (nbr->dd_seqnum == 0) | |
2518efd1 | 801 | nbr->dd_seqnum = quagga_time (NULL); |
2d59836a | 802 | else |
803 | nbr->dd_seqnum++; | |
804 | ||
805 | nbr->dd_flags = OSPF_DD_FLAG_I|OSPF_DD_FLAG_M|OSPF_DD_FLAG_MS; | |
806 | ospf_db_desc_send (nbr); | |
807 | } | |
808 | ||
809 | /* clear cryptographic sequence number */ | |
810 | if (state == NSM_Down) | |
811 | nbr->crypt_seqnum = 0; | |
812 | ||
2d59836a | 813 | /* Preserve old status? */ |
814 | } | |
815 | ||
816 | /* Execute NSM event process. */ | |
817 | int | |
818 | ospf_nsm_event (struct thread *thread) | |
819 | { | |
820 | int event; | |
821 | int next_state; | |
822 | struct ospf_neighbor *nbr; | |
2d59836a | 823 | |
824 | nbr = THREAD_ARG (thread); | |
825 | event = THREAD_VAL (thread); | |
2d59836a | 826 | |
3d63f380 PJ |
827 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) |
828 | zlog_debug ("NSM[%s:%s]: %s (%s)", IF_NAME (nbr->oi), | |
829 | inet_ntoa (nbr->router_id), | |
830 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
831 | ospf_nsm_event_str [event]); | |
832 | ||
539e1523 | 833 | next_state = NSM [nbr->state][event].next_state; |
2d59836a | 834 | |
539e1523 PJ |
835 | /* Call function. */ |
836 | if (NSM [nbr->state][event].func != NULL) | |
ba0beb4a | 837 | { |
539e1523 | 838 | int func_state = (*(NSM [nbr->state][event].func))(nbr); |
ba0beb4a | 839 | |
539e1523 PJ |
840 | if (NSM [nbr->state][event].next_state == NSM_DependUpon) |
841 | next_state = func_state; | |
842 | else if (func_state) | |
843 | { | |
844 | /* There's a mismatch between the FSM tables and what an FSM | |
845 | * action/state-change function returned. State changes which | |
846 | * do not have conditional/DependUpon next-states should not | |
847 | * try set next_state. | |
848 | */ | |
849 | zlog_warn ("NSM[%s:%s]: %s (%s): " | |
850 | "Warning: action tried to change next_state to %s", | |
851 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id), | |
852 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
853 | ospf_nsm_event_str [event], | |
854 | LOOKUP (ospf_nsm_state_msg, func_state)); | |
855 | } | |
ba0beb4a | 856 | } |
2d59836a | 857 | |
539e1523 PJ |
858 | assert (next_state != NSM_DependUpon); |
859 | ||
2d59836a | 860 | /* If state is changed. */ |
861 | if (next_state != nbr->state) | |
3d63f380 PJ |
862 | { |
863 | nsm_notice_state_change (nbr, next_state, event); | |
864 | nsm_change_state (nbr, next_state); | |
865 | } | |
2d59836a | 866 | |
867 | /* Make sure timer is set. */ | |
868 | nsm_timer_set (nbr); | |
869 | ||
1f2c2743 PJ |
870 | /* When event is NSM_KillNbr, InactivityTimer or LLDown, the neighbor |
871 | * is deleted. | |
872 | * | |
873 | * Rather than encode knowledge here of which events lead to NBR | |
874 | * delete, we take our cue from the NSM table, via the dummy | |
875 | * 'Deleted' neighbour state. | |
876 | */ | |
877 | if (nbr->state == NSM_Deleted) | |
878 | ospf_nbr_delete (nbr); | |
879 | ||
2d59836a | 880 | return 0; |
881 | } | |
882 | ||
883 | /* Check loading state. */ | |
884 | void | |
885 | ospf_check_nbr_loading (struct ospf_neighbor *nbr) | |
886 | { | |
887 | if (nbr->state == NSM_Loading) | |
888 | { | |
889 | if (ospf_ls_request_isempty (nbr)) | |
890 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_LoadingDone); | |
891 | else if (nbr->ls_req_last == NULL) | |
892 | ospf_ls_req_event (nbr); | |
893 | } | |
894 | } |