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Commit | Line | Data |
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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 | * | |
896014f4 DL |
18 | * You should have received a copy of the GNU General Public License along |
19 | * with this program; see the file COPYING; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
2d59836a | 21 | */ |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "thread.h" | |
26 | #include "memory.h" | |
27 | #include "hash.h" | |
28 | #include "linklist.h" | |
29 | #include "prefix.h" | |
30 | #include "if.h" | |
31 | #include "table.h" | |
32 | #include "stream.h" | |
33 | #include "table.h" | |
34 | #include "log.h" | |
bf2bfafd | 35 | #include "command.h" |
2d59836a | 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" | |
7f342629 | 50 | #include "ospfd/ospf_bfd.h" |
2d59836a | 51 | |
3012671f DL |
52 | DEFINE_HOOK(ospf_nsm_change, |
53 | (struct ospf_neighbor *on, int state, int oldstate), | |
54 | (on, state, oldstate)) | |
55 | ||
d1b1cd8f | 56 | static void nsm_clear_adj (struct ospf_neighbor *); |
6b0655a2 | 57 | |
2d59836a | 58 | /* OSPF NSM Timer functions. */ |
4dadc291 | 59 | static int |
2d59836a | 60 | ospf_inactivity_timer (struct thread *thread) |
61 | { | |
62 | struct ospf_neighbor *nbr; | |
63 | ||
64 | nbr = THREAD_ARG (thread); | |
65 | nbr->t_inactivity = NULL; | |
66 | ||
67 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
4525281a DL |
68 | zlog_debug("NSM[%s:%s]: Timer (Inactivity timer expire)", |
69 | IF_NAME(nbr->oi), inet_ntoa(nbr->router_id)); | |
2d59836a | 70 | |
71 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_InactivityTimer); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
4dadc291 | 76 | static int |
2d59836a | 77 | ospf_db_desc_timer (struct thread *thread) |
78 | { | |
2d59836a | 79 | struct ospf_neighbor *nbr; |
80 | ||
81 | nbr = THREAD_ARG (thread); | |
82 | nbr->t_db_desc = NULL; | |
83 | ||
2d59836a | 84 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) |
4525281a DL |
85 | zlog_debug("NSM[%s:%s]: Timer (DD Retransmit timer expire)", |
86 | IF_NAME(nbr->oi), inet_ntoa(nbr->src)); | |
2d59836a | 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 | ||
1f2c2743 PJ |
98 | /* Hook function called after ospf NSM event is occured. |
99 | * | |
100 | * Set/clear any timers whose condition is implicit to the neighbour | |
101 | * state. There may be other timers which are set/unset according to other | |
102 | * state. | |
103 | * | |
104 | * We rely on this function to properly clear timers in lower states, | |
105 | * particularly before deleting a neighbour. | |
106 | */ | |
4dadc291 | 107 | static void |
2d59836a | 108 | nsm_timer_set (struct ospf_neighbor *nbr) |
109 | { | |
110 | switch (nbr->state) | |
111 | { | |
1f2c2743 | 112 | case NSM_Deleted: |
2d59836a | 113 | case NSM_Down: |
e55dd53b | 114 | OSPF_NSM_TIMER_OFF (nbr->t_inactivity); |
1f2c2743 | 115 | OSPF_NSM_TIMER_OFF (nbr->t_hello_reply); |
2d59836a | 116 | case NSM_Attempt: |
2d59836a | 117 | case NSM_Init: |
2d59836a | 118 | case NSM_TwoWay: |
119 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
120 | OSPF_NSM_TIMER_OFF (nbr->t_ls_upd); | |
e55dd53b | 121 | OSPF_NSM_TIMER_OFF (nbr->t_ls_req); |
2d59836a | 122 | break; |
123 | case NSM_ExStart: | |
124 | OSPF_NSM_TIMER_ON (nbr->t_db_desc, ospf_db_desc_timer, nbr->v_db_desc); | |
125 | OSPF_NSM_TIMER_OFF (nbr->t_ls_upd); | |
e55dd53b | 126 | OSPF_NSM_TIMER_OFF (nbr->t_ls_req); |
2d59836a | 127 | break; |
128 | case NSM_Exchange: | |
129 | OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
130 | if (!IS_SET_DD_MS (nbr->dd_flags)) | |
131 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
132 | break; | |
133 | case NSM_Loading: | |
2d59836a | 134 | case NSM_Full: |
2d59836a | 135 | default: |
136 | OSPF_NSM_TIMER_OFF (nbr->t_db_desc); | |
137 | break; | |
138 | } | |
139 | } | |
140 | ||
d7b0fb62 PJ |
141 | /* 10.4 of RFC2328, indicate whether an adjacency is appropriate with |
142 | * the given neighbour | |
143 | */ | |
144 | static int | |
145 | nsm_should_adj (struct ospf_neighbor *nbr) | |
146 | { | |
f7a76abf | 147 | struct ospf_interface *oi = nbr->oi; |
d7b0fb62 | 148 | |
f7a76abf | 149 | /* These network types must always form adjacencies. */ |
d7b0fb62 PJ |
150 | if (oi->type == OSPF_IFTYPE_POINTOPOINT |
151 | || oi->type == OSPF_IFTYPE_POINTOMULTIPOINT | |
f7a76abf PJ |
152 | || oi->type == OSPF_IFTYPE_VIRTUALLINK |
153 | /* Router itself is the DRouter or the BDRouter. */ | |
154 | || IPV4_ADDR_SAME (&oi->address->u.prefix4, &DR (oi)) | |
155 | || IPV4_ADDR_SAME (&oi->address->u.prefix4, &BDR (oi)) | |
156 | /* Neighboring Router is the DRouter or the BDRouter. */ | |
157 | || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &DR (oi)) | |
d7b0fb62 PJ |
158 | || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &BDR (oi))) |
159 | return 1; | |
160 | ||
161 | return 0; | |
162 | } | |
6b0655a2 | 163 | |
2d59836a | 164 | /* OSPF NSM functions. */ |
4dadc291 | 165 | static int |
57c5c652 | 166 | nsm_packet_received (struct ospf_neighbor *nbr) |
2d59836a | 167 | { |
168 | /* Start or Restart Inactivity Timer. */ | |
169 | OSPF_NSM_TIMER_OFF (nbr->t_inactivity); | |
170 | ||
171 | OSPF_NSM_TIMER_ON (nbr->t_inactivity, ospf_inactivity_timer, | |
172 | nbr->v_inactivity); | |
173 | ||
174 | if (nbr->oi->type == OSPF_IFTYPE_NBMA && nbr->nbr_nbma) | |
175 | OSPF_POLL_TIMER_OFF (nbr->nbr_nbma->t_poll); | |
176 | ||
8b6912c2 DS |
177 | /* Send proactive ARP requests */ |
178 | if (nbr->state < NSM_Exchange) | |
179 | ospf_proactively_arp (nbr); | |
180 | ||
2d59836a | 181 | return 0; |
182 | } | |
183 | ||
4dadc291 | 184 | static int |
2d59836a | 185 | nsm_start (struct ospf_neighbor *nbr) |
186 | { | |
2d59836a | 187 | if (nbr->nbr_nbma) |
188 | OSPF_POLL_TIMER_OFF (nbr->nbr_nbma->t_poll); | |
189 | ||
190 | OSPF_NSM_TIMER_OFF (nbr->t_inactivity); | |
191 | ||
192 | OSPF_NSM_TIMER_ON (nbr->t_inactivity, ospf_inactivity_timer, | |
193 | nbr->v_inactivity); | |
194 | ||
8b6912c2 DS |
195 | /* Send proactive ARP requests */ |
196 | ospf_proactively_arp (nbr); | |
197 | ||
2d59836a | 198 | return 0; |
199 | } | |
200 | ||
4dadc291 | 201 | static int |
2d59836a | 202 | nsm_twoway_received (struct ospf_neighbor *nbr) |
203 | { | |
8b6912c2 DS |
204 | int adj = nsm_should_adj (nbr); |
205 | ||
206 | /* Send proactive ARP requests */ | |
207 | if (adj) | |
208 | ospf_proactively_arp (nbr); | |
209 | ||
210 | return (adj ? NSM_ExStart : NSM_TwoWay); | |
2d59836a | 211 | } |
212 | ||
213 | int | |
214 | ospf_db_summary_count (struct ospf_neighbor *nbr) | |
215 | { | |
216 | return ospf_lsdb_count_all (&nbr->db_sum); | |
217 | } | |
218 | ||
219 | int | |
220 | ospf_db_summary_isempty (struct ospf_neighbor *nbr) | |
221 | { | |
222 | return ospf_lsdb_isempty (&nbr->db_sum); | |
223 | } | |
224 | ||
4dadc291 | 225 | static int |
68980084 | 226 | ospf_db_summary_add (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) |
2d59836a | 227 | { |
09e4efdc | 228 | switch (lsa->data->type) |
229 | { | |
230 | case OSPF_OPAQUE_LINK_LSA: | |
231 | /* Exclude type-9 LSAs that does not have the same "oi" with "nbr". */ | |
d71ea652 | 232 | if (nbr->oi && ospf_if_exists (lsa->oi) != nbr->oi) |
09e4efdc | 233 | return 0; |
234 | break; | |
235 | case OSPF_OPAQUE_AREA_LSA: | |
236 | /* | |
237 | * It is assured by the caller function "nsm_negotiation_done()" | |
238 | * that every given LSA belongs to the same area with "nbr". | |
239 | */ | |
240 | break; | |
241 | case OSPF_OPAQUE_AS_LSA: | |
242 | default: | |
243 | break; | |
244 | } | |
09e4efdc | 245 | |
2d59836a | 246 | /* Stay away from any Local Translated Type-7 LSAs */ |
247 | if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)) | |
248 | return 0; | |
2d59836a | 249 | |
250 | if (IS_LSA_MAXAGE (lsa)) | |
251 | ospf_ls_retransmit_add (nbr, lsa); | |
252 | else | |
253 | ospf_lsdb_add (&nbr->db_sum, lsa); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | void | |
259 | ospf_db_summary_clear (struct ospf_neighbor *nbr) | |
260 | { | |
261 | struct ospf_lsdb *lsdb; | |
262 | int i; | |
263 | ||
264 | lsdb = &nbr->db_sum; | |
265 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
266 | { | |
267 | struct route_table *table = lsdb->type[i].db; | |
268 | struct route_node *rn; | |
269 | ||
270 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
271 | if (rn->info) | |
272 | ospf_lsdb_delete (&nbr->db_sum, rn->info); | |
273 | } | |
274 | } | |
275 | ||
6b0655a2 | 276 | |
2d59836a | 277 | |
2d59836a | 278 | /* The area link state database consists of the router-LSAs, |
279 | network-LSAs and summary-LSAs contained in the area structure, | |
68980084 | 280 | along with the AS-external-LSAs contained in the global structure. |
281 | AS-external-LSAs are omitted from a virtual neighbor's Database | |
2d59836a | 282 | summary list. AS-external-LSAs are omitted from the Database |
283 | summary list if the area has been configured as a stub. */ | |
4dadc291 | 284 | static int |
2d59836a | 285 | nsm_negotiation_done (struct ospf_neighbor *nbr) |
286 | { | |
68980084 | 287 | struct ospf_area *area = nbr->oi->area; |
288 | struct ospf_lsa *lsa; | |
289 | struct route_node *rn; | |
290 | ||
8b6912c2 DS |
291 | /* Send proactive ARP requests */ |
292 | ospf_proactively_arp (nbr); | |
293 | ||
68980084 | 294 | LSDB_LOOP (ROUTER_LSDB (area), rn, lsa) |
295 | ospf_db_summary_add (nbr, lsa); | |
296 | LSDB_LOOP (NETWORK_LSDB (area), rn, lsa) | |
297 | ospf_db_summary_add (nbr, lsa); | |
298 | LSDB_LOOP (SUMMARY_LSDB (area), rn, lsa) | |
299 | ospf_db_summary_add (nbr, lsa); | |
300 | LSDB_LOOP (ASBR_SUMMARY_LSDB (area), rn, lsa) | |
301 | ospf_db_summary_add (nbr, lsa); | |
2d59836a | 302 | |
2d59836a | 303 | /* Process only if the neighbor is opaque capable. */ |
304 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
305 | { | |
68980084 | 306 | LSDB_LOOP (OPAQUE_LINK_LSDB (area), rn, lsa) |
307 | ospf_db_summary_add (nbr, lsa); | |
308 | LSDB_LOOP (OPAQUE_AREA_LSDB (area), rn, lsa) | |
309 | ospf_db_summary_add (nbr, lsa); | |
2d59836a | 310 | } |
2d59836a | 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 | |
68980084 | 323 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O) |
324 | && (nbr->oi->type != OSPF_IFTYPE_VIRTUALLINK | |
325 | && area->external_routing == OSPF_AREA_DEFAULT)) | |
326 | LSDB_LOOP (OPAQUE_AS_LSDB (nbr->oi->ospf), rn, lsa) | |
327 | ospf_db_summary_add (nbr, lsa); | |
2d59836a | 328 | |
2d59836a | 329 | return 0; |
330 | } | |
331 | ||
4dadc291 | 332 | static int |
2d59836a | 333 | nsm_exchange_done (struct ospf_neighbor *nbr) |
334 | { | |
2d59836a | 335 | if (ospf_ls_request_isempty (nbr)) |
336 | return NSM_Full; | |
337 | ||
2d59836a | 338 | /* Send Link State Request. */ |
97dba7b7 DS |
339 | if (nbr->t_ls_req == NULL) |
340 | ospf_ls_req_send (nbr); | |
2d59836a | 341 | |
342 | return NSM_Loading; | |
343 | } | |
344 | ||
4dadc291 | 345 | static int |
2d59836a | 346 | nsm_adj_ok (struct ospf_neighbor *nbr) |
347 | { | |
d7b0fb62 PJ |
348 | int next_state = nbr->state; |
349 | int adj = nsm_should_adj (nbr); | |
2d59836a | 350 | |
d7b0fb62 | 351 | if (nbr->state == NSM_TwoWay && adj == 1) |
8b6912c2 DS |
352 | { |
353 | next_state = NSM_ExStart; | |
354 | ||
355 | /* Send proactive ARP requests */ | |
356 | ospf_proactively_arp (nbr); | |
357 | } | |
d7b0fb62 | 358 | else if (nbr->state >= NSM_ExStart && adj == 0) |
2d59836a | 359 | next_state = NSM_TwoWay; |
360 | ||
361 | return next_state; | |
362 | } | |
363 | ||
d1b1cd8f PJ |
364 | /* Clear adjacency related state for a neighbour, intended where nbr |
365 | * transitions from > ExStart (i.e. a Full or forming adjacency) | |
366 | * to <= ExStart. | |
367 | */ | |
368 | static void | |
369 | nsm_clear_adj (struct ospf_neighbor *nbr) | |
2d59836a | 370 | { |
371 | /* Clear Database Summary list. */ | |
372 | if (!ospf_db_summary_isempty (nbr)) | |
373 | ospf_db_summary_clear (nbr); | |
374 | ||
375 | /* Clear Link State Request list. */ | |
376 | if (!ospf_ls_request_isempty (nbr)) | |
377 | ospf_ls_request_delete_all (nbr); | |
378 | ||
379 | /* Clear Link State Retransmission list. */ | |
380 | if (!ospf_ls_retransmit_isempty (nbr)) | |
381 | ospf_ls_retransmit_clear (nbr); | |
2d59836a | 382 | |
2d59836a | 383 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) |
384 | UNSET_FLAG (nbr->options, OSPF_OPTION_O); | |
2d59836a | 385 | } |
386 | ||
4dadc291 | 387 | static int |
2d59836a | 388 | nsm_kill_nbr (struct ospf_neighbor *nbr) |
389 | { | |
478aab98 | 390 | /* killing nbr_self is invalid */ |
478aab98 | 391 | if (nbr == nbr->oi->nbr_self) |
1f2c2743 PJ |
392 | { |
393 | assert (nbr != nbr->oi->nbr_self); | |
394 | return 0; | |
395 | } | |
478aab98 | 396 | |
2d59836a | 397 | if (nbr->oi->type == OSPF_IFTYPE_NBMA && nbr->nbr_nbma != NULL) |
398 | { | |
399 | struct ospf_nbr_nbma *nbr_nbma = nbr->nbr_nbma; | |
400 | ||
401 | nbr_nbma->nbr = NULL; | |
402 | nbr_nbma->state_change = nbr->state_change; | |
403 | ||
404 | nbr->nbr_nbma = NULL; | |
405 | ||
406 | OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, | |
407 | nbr_nbma->v_poll); | |
408 | ||
409 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) | |
2a42e285 | 410 | zlog_debug ("NSM[%s:%s]: Down (PollIntervalTimer scheduled)", |
2d59836a | 411 | IF_NAME (nbr->oi), inet_ntoa (nbr->address.u.prefix4)); |
412 | } | |
413 | ||
2d59836a | 414 | return 0; |
415 | } | |
416 | ||
2d59836a | 417 | /* Neighbor State Machine */ |
418 | struct { | |
4dadc291 | 419 | int (*func) (struct ospf_neighbor *); |
2d59836a | 420 | int next_state; |
421 | } NSM [OSPF_NSM_STATE_MAX][OSPF_NSM_EVENT_MAX] = | |
422 | { | |
423 | { | |
424 | /* DependUpon: dummy state. */ | |
539e1523 | 425 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 426 | { NULL, NSM_DependUpon }, /* PacketReceived */ |
539e1523 PJ |
427 | { NULL, NSM_DependUpon }, /* Start */ |
428 | { NULL, NSM_DependUpon }, /* 2-WayReceived */ | |
429 | { NULL, NSM_DependUpon }, /* NegotiationDone */ | |
430 | { NULL, NSM_DependUpon }, /* ExchangeDone */ | |
431 | { NULL, NSM_DependUpon }, /* BadLSReq */ | |
432 | { NULL, NSM_DependUpon }, /* LoadingDone */ | |
433 | { NULL, NSM_DependUpon }, /* AdjOK? */ | |
434 | { NULL, NSM_DependUpon }, /* SeqNumberMismatch */ | |
435 | { NULL, NSM_DependUpon }, /* 1-WayReceived */ | |
436 | { NULL, NSM_DependUpon }, /* KillNbr */ | |
437 | { NULL, NSM_DependUpon }, /* InactivityTimer */ | |
438 | { NULL, NSM_DependUpon }, /* LLDown */ | |
2d59836a | 439 | }, |
1f2c2743 PJ |
440 | { |
441 | /* Deleted: dummy state. */ | |
539e1523 | 442 | { NULL, NSM_Deleted }, /* NoEvent */ |
57c5c652 | 443 | { NULL, NSM_Deleted }, /* PacketReceived */ |
539e1523 PJ |
444 | { NULL, NSM_Deleted }, /* Start */ |
445 | { NULL, NSM_Deleted }, /* 2-WayReceived */ | |
446 | { NULL, NSM_Deleted }, /* NegotiationDone */ | |
447 | { NULL, NSM_Deleted }, /* ExchangeDone */ | |
448 | { NULL, NSM_Deleted }, /* BadLSReq */ | |
449 | { NULL, NSM_Deleted }, /* LoadingDone */ | |
450 | { NULL, NSM_Deleted }, /* AdjOK? */ | |
451 | { NULL, NSM_Deleted }, /* SeqNumberMismatch */ | |
452 | { NULL, NSM_Deleted }, /* 1-WayReceived */ | |
453 | { NULL, NSM_Deleted }, /* KillNbr */ | |
454 | { NULL, NSM_Deleted }, /* InactivityTimer */ | |
455 | { NULL, NSM_Deleted }, /* LLDown */ | |
1f2c2743 | 456 | }, |
2d59836a | 457 | { |
458 | /* Down: */ | |
539e1523 | 459 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 460 | { nsm_packet_received, NSM_Init }, /* PacketReceived */ |
2d59836a | 461 | { nsm_start, NSM_Attempt }, /* Start */ |
539e1523 PJ |
462 | { NULL, NSM_Down }, /* 2-WayReceived */ |
463 | { NULL, NSM_Down }, /* NegotiationDone */ | |
464 | { NULL, NSM_Down }, /* ExchangeDone */ | |
465 | { NULL, NSM_Down }, /* BadLSReq */ | |
466 | { NULL, NSM_Down }, /* LoadingDone */ | |
467 | { NULL, NSM_Down }, /* AdjOK? */ | |
468 | { NULL, NSM_Down }, /* SeqNumberMismatch */ | |
469 | { NULL, NSM_Down }, /* 1-WayReceived */ | |
1f2c2743 | 470 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
471 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
472 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 473 | }, |
474 | { | |
475 | /* Attempt: */ | |
539e1523 | 476 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 477 | { nsm_packet_received, NSM_Init }, /* PacketReceived */ |
539e1523 PJ |
478 | { NULL, NSM_Attempt }, /* Start */ |
479 | { NULL, NSM_Attempt }, /* 2-WayReceived */ | |
480 | { NULL, NSM_Attempt }, /* NegotiationDone */ | |
481 | { NULL, NSM_Attempt }, /* ExchangeDone */ | |
482 | { NULL, NSM_Attempt }, /* BadLSReq */ | |
483 | { NULL, NSM_Attempt }, /* LoadingDone */ | |
484 | { NULL, NSM_Attempt }, /* AdjOK? */ | |
485 | { NULL, NSM_Attempt }, /* SeqNumberMismatch */ | |
486 | { NULL, NSM_Attempt }, /* 1-WayReceived */ | |
1f2c2743 | 487 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
488 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
489 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 490 | }, |
491 | { | |
492 | /* Init: */ | |
539e1523 | 493 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 494 | { nsm_packet_received, NSM_Init }, /* PacketReceived */ |
539e1523 | 495 | { NULL, NSM_Init }, /* Start */ |
2d59836a | 496 | { nsm_twoway_received, NSM_DependUpon }, /* 2-WayReceived */ |
539e1523 PJ |
497 | { NULL, NSM_Init }, /* NegotiationDone */ |
498 | { NULL, NSM_Init }, /* ExchangeDone */ | |
499 | { NULL, NSM_Init }, /* BadLSReq */ | |
500 | { NULL, NSM_Init }, /* LoadingDone */ | |
501 | { NULL, NSM_Init }, /* AdjOK? */ | |
502 | { NULL, NSM_Init }, /* SeqNumberMismatch */ | |
503 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 504 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
505 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
506 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 507 | }, |
508 | { | |
509 | /* 2-Way: */ | |
539e1523 | 510 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 511 | { nsm_packet_received, NSM_TwoWay }, /* HelloReceived */ |
539e1523 PJ |
512 | { NULL, NSM_TwoWay }, /* Start */ |
513 | { NULL, NSM_TwoWay }, /* 2-WayReceived */ | |
514 | { NULL, NSM_TwoWay }, /* NegotiationDone */ | |
515 | { NULL, NSM_TwoWay }, /* ExchangeDone */ | |
516 | { NULL, NSM_TwoWay }, /* BadLSReq */ | |
517 | { NULL, NSM_TwoWay }, /* LoadingDone */ | |
2d59836a | 518 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
519 | { NULL, NSM_TwoWay }, /* SeqNumberMismatch */ |
520 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 521 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
522 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
523 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 524 | }, |
525 | { | |
526 | /* ExStart: */ | |
539e1523 | 527 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 528 | { nsm_packet_received, NSM_ExStart }, /* PacaketReceived */ |
539e1523 PJ |
529 | { NULL, NSM_ExStart }, /* Start */ |
530 | { NULL, NSM_ExStart }, /* 2-WayReceived */ | |
2d59836a | 531 | { nsm_negotiation_done, NSM_Exchange }, /* NegotiationDone */ |
539e1523 PJ |
532 | { NULL, NSM_ExStart }, /* ExchangeDone */ |
533 | { NULL, NSM_ExStart }, /* BadLSReq */ | |
534 | { NULL, NSM_ExStart }, /* LoadingDone */ | |
2d59836a | 535 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
536 | { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
537 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 538 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
539 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
540 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 541 | }, |
542 | { | |
543 | /* Exchange: */ | |
539e1523 | 544 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 545 | { nsm_packet_received, NSM_Exchange }, /* PacketReceived */ |
539e1523 PJ |
546 | { NULL, NSM_Exchange }, /* Start */ |
547 | { NULL, NSM_Exchange }, /* 2-WayReceived */ | |
548 | { NULL, NSM_Exchange }, /* NegotiationDone */ | |
2d59836a | 549 | { nsm_exchange_done, NSM_DependUpon }, /* ExchangeDone */ |
539e1523 PJ |
550 | { NULL, NSM_ExStart }, /* BadLSReq */ |
551 | { NULL, NSM_Exchange }, /* LoadingDone */ | |
2d59836a | 552 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
553 | { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
554 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 555 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
556 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
557 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 558 | }, |
559 | { | |
560 | /* Loading: */ | |
539e1523 | 561 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 562 | { nsm_packet_received, NSM_Loading }, /* PacketReceived */ |
539e1523 PJ |
563 | { NULL, NSM_Loading }, /* Start */ |
564 | { NULL, NSM_Loading }, /* 2-WayReceived */ | |
565 | { NULL, NSM_Loading }, /* NegotiationDone */ | |
566 | { NULL, NSM_Loading }, /* ExchangeDone */ | |
567 | { NULL, NSM_ExStart }, /* BadLSReq */ | |
568 | { NULL, NSM_Full }, /* LoadingDone */ | |
2d59836a | 569 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
570 | { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
571 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 572 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
573 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
574 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 575 | }, |
576 | { /* Full: */ | |
539e1523 | 577 | { NULL, NSM_DependUpon }, /* NoEvent */ |
57c5c652 | 578 | { nsm_packet_received, NSM_Full }, /* PacketReceived */ |
539e1523 PJ |
579 | { NULL, NSM_Full }, /* Start */ |
580 | { NULL, NSM_Full }, /* 2-WayReceived */ | |
581 | { NULL, NSM_Full }, /* NegotiationDone */ | |
582 | { NULL, NSM_Full }, /* ExchangeDone */ | |
583 | { NULL, NSM_ExStart }, /* BadLSReq */ | |
584 | { NULL, NSM_Full }, /* LoadingDone */ | |
2d59836a | 585 | { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
539e1523 PJ |
586 | { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
587 | { NULL, NSM_Init }, /* 1-WayReceived */ | |
1f2c2743 | 588 | { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
539e1523 PJ |
589 | { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
590 | { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ | |
2d59836a | 591 | }, |
592 | }; | |
593 | ||
30a2231a | 594 | static const char *ospf_nsm_event_str[] = |
2d59836a | 595 | { |
596 | "NoEvent", | |
57c5c652 | 597 | "PacketReceived", |
2d59836a | 598 | "Start", |
599 | "2-WayReceived", | |
600 | "NegotiationDone", | |
601 | "ExchangeDone", | |
602 | "BadLSReq", | |
603 | "LoadingDone", | |
604 | "AdjOK?", | |
605 | "SeqNumberMismatch", | |
606 | "1-WayReceived", | |
607 | "KillNbr", | |
608 | "InactivityTimer", | |
609 | "LLDown", | |
610 | }; | |
611 | ||
3d63f380 PJ |
612 | static void |
613 | nsm_notice_state_change (struct ospf_neighbor *nbr, int next_state, int event) | |
614 | { | |
615 | /* Logging change of status. */ | |
616 | if (IS_DEBUG_OSPF (nsm, NSM_STATUS)) | |
617 | zlog_debug ("NSM[%s:%s]: State change %s -> %s (%s)", | |
618 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id), | |
619 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
620 | LOOKUP (ospf_nsm_state_msg, next_state), | |
621 | ospf_nsm_event_str [event]); | |
622 | ||
623 | /* Optionally notify about adjacency changes */ | |
624 | if (CHECK_FLAG(nbr->oi->ospf->config, OSPF_LOG_ADJACENCY_CHANGES) && | |
625 | (CHECK_FLAG(nbr->oi->ospf->config, OSPF_LOG_ADJACENCY_DETAIL) || | |
626 | (next_state == NSM_Full) || (next_state < nbr->state))) | |
627 | zlog_notice("AdjChg: Nbr %s on %s: %s -> %s (%s)", | |
628 | inet_ntoa (nbr->router_id), IF_NAME (nbr->oi), | |
629 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
630 | LOOKUP (ospf_nsm_state_msg, next_state), | |
631 | ospf_nsm_event_str [event]); | |
632 | ||
3fed4160 PJ |
633 | /* Advance in NSM */ |
634 | if (next_state > nbr->state) | |
6ced0e7f | 635 | monotime(&nbr->ts_last_progress); |
3fed4160 PJ |
636 | else /* regression in NSM */ |
637 | { | |
6ced0e7f | 638 | monotime(&nbr->ts_last_regress); |
3fed4160 PJ |
639 | nbr->last_regress_str = ospf_nsm_event_str [event]; |
640 | } | |
90c33177 | 641 | |
3d63f380 PJ |
642 | } |
643 | ||
de54b26c | 644 | static void |
2d59836a | 645 | nsm_change_state (struct ospf_neighbor *nbr, int state) |
646 | { | |
68980084 | 647 | struct ospf_interface *oi = nbr->oi; |
2d59836a | 648 | struct ospf_area *vl_area = NULL; |
649 | u_char old_state; | |
650 | int x; | |
651 | int force = 1; | |
652 | ||
2d59836a | 653 | /* Preserve old status. */ |
654 | old_state = nbr->state; | |
655 | ||
656 | /* Change to new status. */ | |
657 | nbr->state = state; | |
658 | ||
659 | /* Statistics. */ | |
660 | nbr->state_change++; | |
661 | ||
2d59836a | 662 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) |
68980084 | 663 | vl_area = ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id); |
d7e60dd7 | 664 | |
7a9d983e CF |
665 | /* Generate NeighborChange ISM event. |
666 | * | |
667 | * In response to NeighborChange, DR election is rerun. The information | |
668 | * from the election process is required by the router-lsa construction. | |
669 | * | |
670 | * Therefore, trigger the event prior to refreshing the LSAs. */ | |
671 | switch (oi->state) { | |
672 | case ISM_DROther: | |
673 | case ISM_Backup: | |
674 | case ISM_DR: | |
675 | if ((old_state < NSM_TwoWay && state >= NSM_TwoWay) || | |
676 | (old_state >= NSM_TwoWay && state < NSM_TwoWay)) | |
677 | OSPF_ISM_EVENT_EXECUTE (oi, ISM_NeighborChange); | |
678 | break; | |
679 | default: | |
680 | /* ISM_PointToPoint -> ISM_Down, ISM_Loopback -> ISM_Down, etc. */ | |
681 | break; | |
682 | } | |
683 | ||
2d59836a | 684 | /* One of the neighboring routers changes to/from the FULL state. */ |
685 | if ((old_state != NSM_Full && state == NSM_Full) || | |
686 | (old_state == NSM_Full && state != NSM_Full)) | |
3aa8d5f9 | 687 | { |
2d59836a | 688 | if (state == NSM_Full) |
689 | { | |
690 | oi->full_nbrs++; | |
691 | oi->area->full_nbrs++; | |
692 | ||
68980084 | 693 | ospf_check_abr_status (oi->ospf); |
2d59836a | 694 | |
695 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area) | |
696 | if (++vl_area->full_vls == 1) | |
68980084 | 697 | ospf_schedule_abr_task (oi->ospf); |
2d59836a | 698 | |
699 | /* kevinm: refresh any redistributions */ | |
68980084 | 700 | for (x = ZEBRA_ROUTE_SYSTEM; x < ZEBRA_ROUTE_MAX; x++) |
701 | { | |
7c8ff89e DS |
702 | struct list *red_list; |
703 | struct listnode *node; | |
704 | struct ospf_redist *red; | |
705 | ||
706 | if (x == ZEBRA_ROUTE_OSPF6) | |
707 | continue; | |
708 | ||
709 | red_list = oi->ospf->redist[x]; | |
710 | if (!red_list) | |
711 | continue; | |
712 | ||
713 | for (ALL_LIST_ELEMENTS_RO(red_list, node, red)) | |
714 | ospf_external_lsa_refresh_type (oi->ospf, x, red->instance, force); | |
68980084 | 715 | } |
9fd4958a DN |
716 | /* XXX: Clearly some thing is wrong with refresh of external LSAs |
717 | * this added to hack around defaults not refreshing after a timer | |
718 | * jump. | |
719 | */ | |
720 | ospf_external_lsa_refresh_default (oi->ospf); | |
2d59836a | 721 | } |
722 | else | |
723 | { | |
724 | oi->full_nbrs--; | |
725 | oi->area->full_nbrs--; | |
726 | ||
68980084 | 727 | ospf_check_abr_status (oi->ospf); |
2d59836a | 728 | |
729 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area) | |
730 | if (vl_area->full_vls > 0) | |
731 | if (--vl_area->full_vls == 0) | |
68980084 | 732 | ospf_schedule_abr_task (oi->ospf); |
2d59836a | 733 | } |
734 | ||
3aa8d5f9 | 735 | zlog_info ("nsm_change_state(%s, %s -> %s): " |
736 | "scheduling new router-LSA origination", | |
737 | inet_ntoa (nbr->router_id), | |
738 | LOOKUP(ospf_nsm_state_msg, old_state), | |
739 | LOOKUP(ospf_nsm_state_msg, state)); | |
2d59836a | 740 | |
c363d386 | 741 | ospf_router_lsa_update_area (oi->area); |
2d59836a | 742 | |
743 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
744 | { | |
745 | struct ospf_area *vl_area = | |
68980084 | 746 | ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id); |
2d59836a | 747 | |
748 | if (vl_area) | |
c363d386 | 749 | ospf_router_lsa_update_area (vl_area); |
2d59836a | 750 | } |
751 | ||
752 | /* Originate network-LSA. */ | |
753 | if (oi->state == ISM_DR) | |
754 | { | |
755 | if (oi->network_lsa_self && oi->full_nbrs == 0) | |
756 | { | |
757 | ospf_lsa_flush_area (oi->network_lsa_self, oi->area); | |
1fe6ed38 | 758 | ospf_lsa_unlock (&oi->network_lsa_self); |
2d59836a | 759 | oi->network_lsa_self = NULL; |
2d59836a | 760 | } |
761 | else | |
c363d386 | 762 | ospf_network_lsa_update (oi); |
2d59836a | 763 | } |
764 | } | |
765 | ||
2d59836a | 766 | ospf_opaque_nsm_change (nbr, old_state); |
2d59836a | 767 | |
d1b1cd8f PJ |
768 | /* State changes from > ExStart to <= ExStart should clear any Exchange |
769 | * or Full/LSA Update related lists and state. | |
770 | * Potential causal events: BadLSReq, SeqNumberMismatch, AdjOK? | |
d1b1cd8f | 771 | */ |
539e1523 | 772 | if ((old_state > NSM_ExStart) && (state <= NSM_ExStart)) |
d1b1cd8f PJ |
773 | nsm_clear_adj (nbr); |
774 | ||
2d59836a | 775 | /* Start DD exchange protocol */ |
776 | if (state == NSM_ExStart) | |
777 | { | |
778 | if (nbr->dd_seqnum == 0) | |
833a7ff9 | 779 | nbr->dd_seqnum = (uint32_t)random (); |
2d59836a | 780 | else |
781 | nbr->dd_seqnum++; | |
782 | ||
783 | nbr->dd_flags = OSPF_DD_FLAG_I|OSPF_DD_FLAG_M|OSPF_DD_FLAG_MS; | |
784 | ospf_db_desc_send (nbr); | |
785 | } | |
786 | ||
787 | /* clear cryptographic sequence number */ | |
788 | if (state == NSM_Down) | |
789 | nbr->crypt_seqnum = 0; | |
790 | ||
7f342629 DS |
791 | ospf_bfd_trigger_event(nbr, old_state, state); |
792 | ||
2d59836a | 793 | /* Preserve old status? */ |
794 | } | |
795 | ||
796 | /* Execute NSM event process. */ | |
797 | int | |
798 | ospf_nsm_event (struct thread *thread) | |
799 | { | |
800 | int event; | |
801 | int next_state; | |
802 | struct ospf_neighbor *nbr; | |
2d59836a | 803 | |
804 | nbr = THREAD_ARG (thread); | |
805 | event = THREAD_VAL (thread); | |
2d59836a | 806 | |
3d63f380 PJ |
807 | if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) |
808 | zlog_debug ("NSM[%s:%s]: %s (%s)", IF_NAME (nbr->oi), | |
809 | inet_ntoa (nbr->router_id), | |
810 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
811 | ospf_nsm_event_str [event]); | |
812 | ||
539e1523 | 813 | next_state = NSM [nbr->state][event].next_state; |
2d59836a | 814 | |
539e1523 PJ |
815 | /* Call function. */ |
816 | if (NSM [nbr->state][event].func != NULL) | |
ba0beb4a | 817 | { |
539e1523 | 818 | int func_state = (*(NSM [nbr->state][event].func))(nbr); |
ba0beb4a | 819 | |
539e1523 PJ |
820 | if (NSM [nbr->state][event].next_state == NSM_DependUpon) |
821 | next_state = func_state; | |
822 | else if (func_state) | |
823 | { | |
824 | /* There's a mismatch between the FSM tables and what an FSM | |
825 | * action/state-change function returned. State changes which | |
826 | * do not have conditional/DependUpon next-states should not | |
827 | * try set next_state. | |
828 | */ | |
829 | zlog_warn ("NSM[%s:%s]: %s (%s): " | |
830 | "Warning: action tried to change next_state to %s", | |
831 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id), | |
832 | LOOKUP (ospf_nsm_state_msg, nbr->state), | |
833 | ospf_nsm_event_str [event], | |
834 | LOOKUP (ospf_nsm_state_msg, func_state)); | |
835 | } | |
ba0beb4a | 836 | } |
2d59836a | 837 | |
539e1523 PJ |
838 | assert (next_state != NSM_DependUpon); |
839 | ||
2d59836a | 840 | /* If state is changed. */ |
841 | if (next_state != nbr->state) | |
3d63f380 | 842 | { |
3012671f DL |
843 | int old_state = nbr->state; |
844 | ||
3d63f380 PJ |
845 | nsm_notice_state_change (nbr, next_state, event); |
846 | nsm_change_state (nbr, next_state); | |
66239ca6 | 847 | |
3012671f | 848 | hook_call(ospf_nsm_change, nbr, next_state, old_state); |
3d63f380 | 849 | } |
2d59836a | 850 | |
851 | /* Make sure timer is set. */ | |
852 | nsm_timer_set (nbr); | |
853 | ||
1f2c2743 PJ |
854 | /* When event is NSM_KillNbr, InactivityTimer or LLDown, the neighbor |
855 | * is deleted. | |
856 | * | |
857 | * Rather than encode knowledge here of which events lead to NBR | |
858 | * delete, we take our cue from the NSM table, via the dummy | |
859 | * 'Deleted' neighbour state. | |
860 | */ | |
861 | if (nbr->state == NSM_Deleted) | |
862 | ospf_nbr_delete (nbr); | |
863 | ||
2d59836a | 864 | return 0; |
865 | } | |
866 | ||
867 | /* Check loading state. */ | |
868 | void | |
869 | ospf_check_nbr_loading (struct ospf_neighbor *nbr) | |
870 | { | |
871 | if (nbr->state == NSM_Loading) | |
872 | { | |
873 | if (ospf_ls_request_isempty (nbr)) | |
874 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_LoadingDone); | |
875 | else if (nbr->ls_req_last == NULL) | |
876 | ospf_ls_req_event (nbr); | |
877 | } | |
878 | } |