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