2 * OSPF version 2 Neighbor State Machine
3 * From RFC2328 [OSPF Version 2]
4 * Copyright (C) 1999, 2000 Toshiaki Takada
6 * This file is part of GNU Zebra.
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
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.
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
38 #include "ospfd/ospfd.h"
39 #include "ospfd/ospf_interface.h"
40 #include "ospfd/ospf_ism.h"
41 #include "ospfd/ospf_asbr.h"
42 #include "ospfd/ospf_lsa.h"
43 #include "ospfd/ospf_lsdb.h"
44 #include "ospfd/ospf_neighbor.h"
45 #include "ospfd/ospf_nsm.h"
46 #include "ospfd/ospf_network.h"
47 #include "ospfd/ospf_packet.h"
48 #include "ospfd/ospf_dump.h"
49 #include "ospfd/ospf_flood.h"
50 #include "ospfd/ospf_abr.h"
51 #include "ospfd/ospf_bfd.h"
52 #include "ospfd/ospf_gr.h"
53 #include "ospfd/ospf_errors.h"
55 DEFINE_HOOK(ospf_nsm_change
,
56 (struct ospf_neighbor
* on
, int state
, int oldstate
),
57 (on
, state
, oldstate
));
59 static void nsm_clear_adj(struct ospf_neighbor
*);
61 /* OSPF NSM Timer functions. */
62 static int ospf_inactivity_timer(struct thread
*thread
)
64 struct ospf_neighbor
*nbr
;
66 nbr
= THREAD_ARG(thread
);
67 nbr
->t_inactivity
= NULL
;
69 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
70 zlog_debug("NSM[%s:%pI4:%s]: Timer (Inactivity timer expire)",
71 IF_NAME(nbr
->oi
), &nbr
->router_id
,
72 ospf_get_name(nbr
->oi
->ospf
));
74 /* Dont trigger NSM_InactivityTimer event , if the current
75 * router acting as HELPER for this neighbour.
77 if (!OSPF_GR_IS_ACTIVE_HELPER(nbr
))
78 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_InactivityTimer
);
79 else if (IS_DEBUG_OSPF_GR
)
81 "%s, Acting as HELPER for this neighbour, So inactivitytimer event will not be fired.",
87 static int ospf_db_desc_timer(struct thread
*thread
)
89 struct ospf_neighbor
*nbr
;
91 nbr
= THREAD_ARG(thread
);
92 nbr
->t_db_desc
= NULL
;
94 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
95 zlog_debug("NSM[%s:%pI4:%s]: Timer (DD Retransmit timer expire)",
96 IF_NAME(nbr
->oi
), &nbr
->src
,
97 ospf_get_name(nbr
->oi
->ospf
));
99 /* resent last send DD packet. */
100 assert(nbr
->last_send
);
101 ospf_db_desc_resend(nbr
);
103 /* DD Retransmit timer set. */
104 OSPF_NSM_TIMER_ON(nbr
->t_db_desc
, ospf_db_desc_timer
, nbr
->v_db_desc
);
109 /* Hook function called after ospf NSM event is occurred.
111 * Set/clear any timers whose condition is implicit to the neighbour
112 * state. There may be other timers which are set/unset according to other
115 * We rely on this function to properly clear timers in lower states,
116 * particularly before deleting a neighbour.
118 static void nsm_timer_set(struct ospf_neighbor
*nbr
)
120 switch (nbr
->state
) {
123 OSPF_NSM_TIMER_OFF(nbr
->t_inactivity
);
124 OSPF_NSM_TIMER_OFF(nbr
->t_hello_reply
);
129 OSPF_NSM_TIMER_OFF(nbr
->t_db_desc
);
130 OSPF_NSM_TIMER_OFF(nbr
->t_ls_upd
);
131 OSPF_NSM_TIMER_OFF(nbr
->t_ls_req
);
134 OSPF_NSM_TIMER_ON(nbr
->t_db_desc
, ospf_db_desc_timer
,
136 OSPF_NSM_TIMER_OFF(nbr
->t_ls_upd
);
137 OSPF_NSM_TIMER_OFF(nbr
->t_ls_req
);
140 OSPF_NSM_TIMER_ON(nbr
->t_ls_upd
, ospf_ls_upd_timer
,
142 if (!IS_SET_DD_MS(nbr
->dd_flags
))
143 OSPF_NSM_TIMER_OFF(nbr
->t_db_desc
);
148 OSPF_NSM_TIMER_OFF(nbr
->t_db_desc
);
153 /* 10.4 of RFC2328, indicate whether an adjacency is appropriate with
154 * the given neighbour
156 int nsm_should_adj(struct ospf_neighbor
*nbr
)
158 struct ospf_interface
*oi
= nbr
->oi
;
160 /* These network types must always form adjacencies. */
161 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
162 || oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
163 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
164 /* Router itself is the DRouter or the BDRouter. */
165 || IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &DR(oi
))
166 || IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &BDR(oi
))
167 /* Neighboring Router is the DRouter or the BDRouter. */
168 || IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &DR(oi
))
169 || IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &BDR(oi
)))
175 /* OSPF NSM functions. */
176 static int nsm_packet_received(struct ospf_neighbor
*nbr
)
178 /* Start or Restart Inactivity Timer. */
179 OSPF_NSM_TIMER_OFF(nbr
->t_inactivity
);
181 OSPF_NSM_TIMER_ON(nbr
->t_inactivity
, ospf_inactivity_timer
,
184 if (nbr
->oi
->type
== OSPF_IFTYPE_NBMA
&& nbr
->nbr_nbma
)
185 OSPF_POLL_TIMER_OFF(nbr
->nbr_nbma
->t_poll
);
187 /* Send proactive ARP requests */
188 if (nbr
->state
< NSM_Exchange
)
189 ospf_proactively_arp(nbr
);
194 static int nsm_start(struct ospf_neighbor
*nbr
)
197 OSPF_POLL_TIMER_OFF(nbr
->nbr_nbma
->t_poll
);
199 OSPF_NSM_TIMER_OFF(nbr
->t_inactivity
);
201 OSPF_NSM_TIMER_ON(nbr
->t_inactivity
, ospf_inactivity_timer
,
204 /* Send proactive ARP requests */
205 ospf_proactively_arp(nbr
);
210 static int nsm_twoway_received(struct ospf_neighbor
*nbr
)
212 int adj
= nsm_should_adj(nbr
);
214 /* Send proactive ARP requests */
216 ospf_proactively_arp(nbr
);
218 return (adj
? NSM_ExStart
: NSM_TwoWay
);
221 int ospf_db_summary_count(struct ospf_neighbor
*nbr
)
223 return ospf_lsdb_count_all(&nbr
->db_sum
);
226 int ospf_db_summary_isempty(struct ospf_neighbor
*nbr
)
228 return ospf_lsdb_isempty(&nbr
->db_sum
);
231 static int ospf_db_summary_add(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
233 switch (lsa
->data
->type
) {
234 case OSPF_OPAQUE_LINK_LSA
:
235 /* Exclude type-9 LSAs that does not have the same "oi" with
237 if (ospf_if_exists(lsa
->oi
) != nbr
->oi
)
240 case OSPF_OPAQUE_AREA_LSA
:
242 * It is assured by the caller function "nsm_negotiation_done()"
243 * that every given LSA belongs to the same area with "nbr".
246 case OSPF_OPAQUE_AS_LSA
:
251 /* Stay away from any Local Translated Type-7 LSAs */
252 if (CHECK_FLAG(lsa
->flags
, OSPF_LSA_LOCAL_XLT
))
255 if (IS_LSA_MAXAGE(lsa
))
256 ospf_ls_retransmit_add(nbr
, lsa
);
258 ospf_lsdb_add(&nbr
->db_sum
, lsa
);
263 void ospf_db_summary_clear(struct ospf_neighbor
*nbr
)
265 struct ospf_lsdb
*lsdb
;
269 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
270 struct route_table
*table
= lsdb
->type
[i
].db
;
271 struct route_node
*rn
;
273 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
275 ospf_lsdb_delete(&nbr
->db_sum
, rn
->info
);
280 /* The area link state database consists of the router-LSAs,
281 network-LSAs and summary-LSAs contained in the area structure,
282 along with the AS-external-LSAs contained in the global structure.
283 AS-external-LSAs are omitted from a virtual neighbor's Database
284 summary list. AS-external-LSAs are omitted from the Database
285 summary list if the area has been configured as a stub. */
286 static int nsm_negotiation_done(struct ospf_neighbor
*nbr
)
288 struct ospf_area
*area
= nbr
->oi
->area
;
289 struct ospf_lsa
*lsa
;
290 struct route_node
*rn
;
292 /* Send proactive ARP requests */
293 ospf_proactively_arp(nbr
);
295 LSDB_LOOP (ROUTER_LSDB(area
), rn
, lsa
)
296 ospf_db_summary_add(nbr
, lsa
);
297 LSDB_LOOP (NETWORK_LSDB(area
), rn
, lsa
)
298 ospf_db_summary_add(nbr
, lsa
);
299 LSDB_LOOP (SUMMARY_LSDB(area
), rn
, lsa
)
300 ospf_db_summary_add(nbr
, lsa
);
301 LSDB_LOOP (ASBR_SUMMARY_LSDB(area
), rn
, lsa
)
302 ospf_db_summary_add(nbr
, lsa
);
304 /* Process only if the neighbor is opaque capable. */
305 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
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
);
312 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
)) {
313 LSDB_LOOP (NSSA_LSDB(area
), rn
, lsa
)
314 ospf_db_summary_add(nbr
, lsa
);
317 if (nbr
->oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
318 && area
->external_routing
== OSPF_AREA_DEFAULT
)
319 LSDB_LOOP (EXTERNAL_LSDB(nbr
->oi
->ospf
), rn
, lsa
)
320 ospf_db_summary_add(nbr
, lsa
);
322 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
323 && (nbr
->oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
324 && area
->external_routing
== OSPF_AREA_DEFAULT
))
325 LSDB_LOOP (OPAQUE_AS_LSDB(nbr
->oi
->ospf
), rn
, lsa
)
326 ospf_db_summary_add(nbr
, lsa
);
331 static int nsm_exchange_done(struct ospf_neighbor
*nbr
)
333 if (ospf_ls_request_isempty(nbr
))
336 /* Send Link State Request. */
337 if (nbr
->t_ls_req
== NULL
)
338 ospf_ls_req_send(nbr
);
343 static int nsm_adj_ok(struct ospf_neighbor
*nbr
)
345 int next_state
= nbr
->state
;
346 int adj
= nsm_should_adj(nbr
);
348 if (nbr
->state
== NSM_TwoWay
&& adj
== 1) {
349 next_state
= NSM_ExStart
;
351 /* Send proactive ARP requests */
352 ospf_proactively_arp(nbr
);
353 } else if (nbr
->state
>= NSM_ExStart
&& adj
== 0)
354 next_state
= NSM_TwoWay
;
359 /* Clear adjacency related state for a neighbour, intended where nbr
360 * transitions from > ExStart (i.e. a Full or forming adjacency)
363 static void nsm_clear_adj(struct ospf_neighbor
*nbr
)
365 /* Clear Database Summary list. */
366 if (!ospf_db_summary_isempty(nbr
))
367 ospf_db_summary_clear(nbr
);
369 /* Clear Link State Request list. */
370 if (!ospf_ls_request_isempty(nbr
))
371 ospf_ls_request_delete_all(nbr
);
373 /* Clear Link State Retransmission list. */
374 if (!ospf_ls_retransmit_isempty(nbr
))
375 ospf_ls_retransmit_clear(nbr
);
377 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
))
378 UNSET_FLAG(nbr
->options
, OSPF_OPTION_O
);
381 static int nsm_kill_nbr(struct ospf_neighbor
*nbr
)
383 /* killing nbr_self is invalid */
384 if (nbr
== nbr
->oi
->nbr_self
) {
385 assert(nbr
!= nbr
->oi
->nbr_self
);
389 if (nbr
->oi
->type
== OSPF_IFTYPE_NBMA
&& nbr
->nbr_nbma
!= NULL
) {
390 struct ospf_nbr_nbma
*nbr_nbma
= nbr
->nbr_nbma
;
392 nbr_nbma
->nbr
= NULL
;
393 nbr_nbma
->state_change
= nbr
->state_change
;
395 nbr
->nbr_nbma
= NULL
;
397 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
400 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
402 "NSM[%s:%pI4:%s]: Down (PollIntervalTimer scheduled)",
404 &nbr
->address
.u
.prefix4
,
405 ospf_get_name(nbr
->oi
->ospf
));
411 /* Neighbor State Machine */
413 int (*func
)(struct ospf_neighbor
*);
415 } NSM
[OSPF_NSM_STATE_MAX
][OSPF_NSM_EVENT_MAX
] = {
417 /* DependUpon: dummy state. */
418 {NULL
, NSM_DependUpon
}, /* NoEvent */
419 {NULL
, NSM_DependUpon
}, /* PacketReceived */
420 {NULL
, NSM_DependUpon
}, /* Start */
421 {NULL
, NSM_DependUpon
}, /* 2-WayReceived */
422 {NULL
, NSM_DependUpon
}, /* NegotiationDone */
423 {NULL
, NSM_DependUpon
}, /* ExchangeDone */
424 {NULL
, NSM_DependUpon
}, /* BadLSReq */
425 {NULL
, NSM_DependUpon
}, /* LoadingDone */
426 {NULL
, NSM_DependUpon
}, /* AdjOK? */
427 {NULL
, NSM_DependUpon
}, /* SeqNumberMismatch */
428 {NULL
, NSM_DependUpon
}, /* 1-WayReceived */
429 {NULL
, NSM_DependUpon
}, /* KillNbr */
430 {NULL
, NSM_DependUpon
}, /* InactivityTimer */
431 {NULL
, NSM_DependUpon
}, /* LLDown */
434 /* Deleted: dummy state. */
435 {NULL
, NSM_Deleted
}, /* NoEvent */
436 {NULL
, NSM_Deleted
}, /* PacketReceived */
437 {NULL
, NSM_Deleted
}, /* Start */
438 {NULL
, NSM_Deleted
}, /* 2-WayReceived */
439 {NULL
, NSM_Deleted
}, /* NegotiationDone */
440 {NULL
, NSM_Deleted
}, /* ExchangeDone */
441 {NULL
, NSM_Deleted
}, /* BadLSReq */
442 {NULL
, NSM_Deleted
}, /* LoadingDone */
443 {NULL
, NSM_Deleted
}, /* AdjOK? */
444 {NULL
, NSM_Deleted
}, /* SeqNumberMismatch */
445 {NULL
, NSM_Deleted
}, /* 1-WayReceived */
446 {NULL
, NSM_Deleted
}, /* KillNbr */
447 {NULL
, NSM_Deleted
}, /* InactivityTimer */
448 {NULL
, NSM_Deleted
}, /* LLDown */
452 {NULL
, NSM_DependUpon
}, /* NoEvent */
453 {nsm_packet_received
, NSM_Init
}, /* PacketReceived */
454 {nsm_start
, NSM_Attempt
}, /* Start */
455 {NULL
, NSM_Down
}, /* 2-WayReceived */
456 {NULL
, NSM_Down
}, /* NegotiationDone */
457 {NULL
, NSM_Down
}, /* ExchangeDone */
458 {NULL
, NSM_Down
}, /* BadLSReq */
459 {NULL
, NSM_Down
}, /* LoadingDone */
460 {NULL
, NSM_Down
}, /* AdjOK? */
461 {NULL
, NSM_Down
}, /* SeqNumberMismatch */
462 {NULL
, NSM_Down
}, /* 1-WayReceived */
463 {nsm_kill_nbr
, NSM_Deleted
}, /* KillNbr */
464 {nsm_kill_nbr
, NSM_Deleted
}, /* InactivityTimer */
465 {nsm_kill_nbr
, NSM_Deleted
}, /* LLDown */
469 {NULL
, NSM_DependUpon
}, /* NoEvent */
470 {nsm_packet_received
, NSM_Init
}, /* PacketReceived */
471 {NULL
, NSM_Attempt
}, /* Start */
472 {NULL
, NSM_Attempt
}, /* 2-WayReceived */
473 {NULL
, NSM_Attempt
}, /* NegotiationDone */
474 {NULL
, NSM_Attempt
}, /* ExchangeDone */
475 {NULL
, NSM_Attempt
}, /* BadLSReq */
476 {NULL
, NSM_Attempt
}, /* LoadingDone */
477 {NULL
, NSM_Attempt
}, /* AdjOK? */
478 {NULL
, NSM_Attempt
}, /* SeqNumberMismatch */
479 {NULL
, NSM_Attempt
}, /* 1-WayReceived */
480 {nsm_kill_nbr
, NSM_Deleted
}, /* KillNbr */
481 {nsm_kill_nbr
, NSM_Deleted
}, /* InactivityTimer */
482 {nsm_kill_nbr
, NSM_Deleted
}, /* LLDown */
486 {NULL
, NSM_DependUpon
}, /* NoEvent */
487 {nsm_packet_received
, NSM_Init
}, /* PacketReceived */
488 {NULL
, NSM_Init
}, /* Start */
489 {nsm_twoway_received
, NSM_DependUpon
}, /* 2-WayReceived */
490 {NULL
, NSM_Init
}, /* NegotiationDone */
491 {NULL
, NSM_Init
}, /* ExchangeDone */
492 {NULL
, NSM_Init
}, /* BadLSReq */
493 {NULL
, NSM_Init
}, /* LoadingDone */
494 {NULL
, NSM_Init
}, /* AdjOK? */
495 {NULL
, NSM_Init
}, /* SeqNumberMismatch */
496 {NULL
, NSM_Init
}, /* 1-WayReceived */
497 {nsm_kill_nbr
, NSM_Deleted
}, /* KillNbr */
498 {nsm_kill_nbr
, NSM_Deleted
}, /* InactivityTimer */
499 {nsm_kill_nbr
, NSM_Deleted
}, /* LLDown */
503 {NULL
, NSM_DependUpon
}, /* NoEvent */
504 {nsm_packet_received
, NSM_TwoWay
}, /* HelloReceived */
505 {NULL
, NSM_TwoWay
}, /* Start */
506 {NULL
, NSM_TwoWay
}, /* 2-WayReceived */
507 {NULL
, NSM_TwoWay
}, /* NegotiationDone */
508 {NULL
, NSM_TwoWay
}, /* ExchangeDone */
509 {NULL
, NSM_TwoWay
}, /* BadLSReq */
510 {NULL
, NSM_TwoWay
}, /* LoadingDone */
511 {nsm_adj_ok
, NSM_DependUpon
}, /* AdjOK? */
512 {NULL
, NSM_TwoWay
}, /* SeqNumberMismatch */
513 {NULL
, NSM_Init
}, /* 1-WayReceived */
514 {nsm_kill_nbr
, NSM_Deleted
}, /* KillNbr */
515 {nsm_kill_nbr
, NSM_Deleted
}, /* InactivityTimer */
516 {nsm_kill_nbr
, NSM_Deleted
}, /* LLDown */
520 {NULL
, NSM_DependUpon
}, /* NoEvent */
521 {nsm_packet_received
, NSM_ExStart
}, /* PacaketReceived */
522 {NULL
, NSM_ExStart
}, /* Start */
523 {NULL
, NSM_ExStart
}, /* 2-WayReceived */
524 {nsm_negotiation_done
, NSM_Exchange
}, /* NegotiationDone */
525 {NULL
, NSM_ExStart
}, /* ExchangeDone */
526 {NULL
, NSM_ExStart
}, /* BadLSReq */
527 {NULL
, NSM_ExStart
}, /* LoadingDone */
528 {nsm_adj_ok
, NSM_DependUpon
}, /* AdjOK? */
529 {NULL
, NSM_ExStart
}, /* SeqNumberMismatch */
530 {NULL
, NSM_Init
}, /* 1-WayReceived */
531 {nsm_kill_nbr
, NSM_Deleted
}, /* KillNbr */
532 {nsm_kill_nbr
, NSM_Deleted
}, /* InactivityTimer */
533 {nsm_kill_nbr
, NSM_Deleted
}, /* LLDown */
537 {NULL
, NSM_DependUpon
}, /* NoEvent */
538 {nsm_packet_received
, NSM_Exchange
}, /* PacketReceived */
539 {NULL
, NSM_Exchange
}, /* Start */
540 {NULL
, NSM_Exchange
}, /* 2-WayReceived */
541 {NULL
, NSM_Exchange
}, /* NegotiationDone */
542 {nsm_exchange_done
, NSM_DependUpon
}, /* ExchangeDone */
543 {NULL
, NSM_ExStart
}, /* BadLSReq */
544 {NULL
, NSM_Exchange
}, /* LoadingDone */
545 {nsm_adj_ok
, NSM_DependUpon
}, /* AdjOK? */
546 {NULL
, NSM_ExStart
}, /* SeqNumberMismatch */
547 {NULL
, NSM_Init
}, /* 1-WayReceived */
548 {nsm_kill_nbr
, NSM_Deleted
}, /* KillNbr */
549 {nsm_kill_nbr
, NSM_Deleted
}, /* InactivityTimer */
550 {nsm_kill_nbr
, NSM_Deleted
}, /* LLDown */
554 {NULL
, NSM_DependUpon
}, /* NoEvent */
555 {nsm_packet_received
, NSM_Loading
}, /* PacketReceived */
556 {NULL
, NSM_Loading
}, /* Start */
557 {NULL
, NSM_Loading
}, /* 2-WayReceived */
558 {NULL
, NSM_Loading
}, /* NegotiationDone */
559 {NULL
, NSM_Loading
}, /* ExchangeDone */
560 {NULL
, NSM_ExStart
}, /* BadLSReq */
561 {NULL
, NSM_Full
}, /* LoadingDone */
562 {nsm_adj_ok
, NSM_DependUpon
}, /* AdjOK? */
563 {NULL
, NSM_ExStart
}, /* SeqNumberMismatch */
564 {NULL
, NSM_Init
}, /* 1-WayReceived */
565 {nsm_kill_nbr
, NSM_Deleted
}, /* KillNbr */
566 {nsm_kill_nbr
, NSM_Deleted
}, /* InactivityTimer */
567 {nsm_kill_nbr
, NSM_Deleted
}, /* LLDown */
571 {NULL
, NSM_DependUpon
}, /* NoEvent */
572 {nsm_packet_received
, NSM_Full
}, /* PacketReceived */
573 {NULL
, NSM_Full
}, /* Start */
574 {NULL
, NSM_Full
}, /* 2-WayReceived */
575 {NULL
, NSM_Full
}, /* NegotiationDone */
576 {NULL
, NSM_Full
}, /* ExchangeDone */
577 {NULL
, NSM_ExStart
}, /* BadLSReq */
578 {NULL
, NSM_Full
}, /* LoadingDone */
579 {nsm_adj_ok
, NSM_DependUpon
}, /* AdjOK? */
580 {NULL
, NSM_ExStart
}, /* SeqNumberMismatch */
581 {NULL
, NSM_Init
}, /* 1-WayReceived */
582 {nsm_kill_nbr
, NSM_Deleted
}, /* KillNbr */
583 {nsm_kill_nbr
, NSM_Deleted
}, /* InactivityTimer */
584 {nsm_kill_nbr
, NSM_Deleted
}, /* LLDown */
588 static const char *const ospf_nsm_event_str
[] = {
589 "NoEvent", "PacketReceived", "Start",
590 "2-WayReceived", "NegotiationDone", "ExchangeDone",
591 "BadLSReq", "LoadingDone", "AdjOK?",
592 "SeqNumberMismatch", "1-WayReceived", "KillNbr",
593 "InactivityTimer", "LLDown",
596 static void nsm_notice_state_change(struct ospf_neighbor
*nbr
, int next_state
,
599 /* Logging change of status. */
600 if (IS_DEBUG_OSPF(nsm
, NSM_STATUS
))
601 zlog_debug("NSM[%s:%pI4:%s]: State change %s -> %s (%s)",
602 IF_NAME(nbr
->oi
), &nbr
->router_id
,
603 ospf_get_name(nbr
->oi
->ospf
),
604 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
605 lookup_msg(ospf_nsm_state_msg
, next_state
, NULL
),
606 ospf_nsm_event_str
[event
]);
608 /* Optionally notify about adjacency changes */
609 if (CHECK_FLAG(nbr
->oi
->ospf
->config
, OSPF_LOG_ADJACENCY_CHANGES
)
610 && (CHECK_FLAG(nbr
->oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
)
611 || (next_state
== NSM_Full
) || (next_state
< nbr
->state
)))
612 zlog_notice("AdjChg: Nbr %pI4(%s) on %s: %s -> %s (%s)",
614 ospf_get_name(nbr
->oi
->ospf
), IF_NAME(nbr
->oi
),
615 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
616 lookup_msg(ospf_nsm_state_msg
, next_state
, NULL
),
617 ospf_nsm_event_str
[event
]);
620 if (next_state
> nbr
->state
)
621 monotime(&nbr
->ts_last_progress
);
622 else /* regression in NSM */
624 monotime(&nbr
->ts_last_regress
);
625 nbr
->last_regress_str
= ospf_nsm_event_str
[event
];
629 static void nsm_change_state(struct ospf_neighbor
*nbr
, int state
)
631 struct ospf_interface
*oi
= nbr
->oi
;
632 struct ospf_area
*vl_area
= NULL
;
635 /* Preserve old status. */
636 old_state
= nbr
->state
;
638 /* Change to new status. */
644 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
645 vl_area
= ospf_area_lookup_by_area_id(oi
->ospf
,
646 oi
->vl_data
->vl_area_id
);
648 /* Generate NeighborChange ISM event.
650 * In response to NeighborChange, DR election is rerun. The information
651 * from the election process is required by the router-lsa construction.
653 * Therefore, trigger the event prior to refreshing the LSAs. */
658 if ((old_state
< NSM_TwoWay
&& state
>= NSM_TwoWay
)
659 || (old_state
>= NSM_TwoWay
&& state
< NSM_TwoWay
))
660 OSPF_ISM_EVENT_EXECUTE(oi
, ISM_NeighborChange
);
663 /* ISM_PointToPoint -> ISM_Down, ISM_Loopback -> ISM_Down, etc.
668 /* One of the neighboring routers changes to/from the FULL state. */
669 if ((old_state
!= NSM_Full
&& state
== NSM_Full
)
670 || (old_state
== NSM_Full
&& state
!= NSM_Full
)) {
671 if (state
== NSM_Full
) {
673 oi
->area
->full_nbrs
++;
675 ospf_check_abr_status(oi
->ospf
);
677 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
&& vl_area
)
678 if (++vl_area
->full_vls
== 1)
679 ospf_schedule_abr_task(oi
->ospf
);
682 oi
->area
->full_nbrs
--;
684 ospf_check_abr_status(oi
->ospf
);
686 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
&& vl_area
)
687 if (vl_area
->full_vls
> 0)
688 if (--vl_area
->full_vls
== 0)
689 ospf_schedule_abr_task(
693 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
695 "%s:[%pI4:%s], %s -> %s): scheduling new router-LSA origination",
696 __func__
, &nbr
->router_id
,
697 ospf_get_name(oi
->ospf
),
698 lookup_msg(ospf_nsm_state_msg
, old_state
, NULL
),
699 lookup_msg(ospf_nsm_state_msg
, state
, NULL
));
701 /* Dont originate router LSA if the current
702 * router is acting as a HELPER for this neighbour.
704 if (!OSPF_GR_IS_ACTIVE_HELPER(nbr
))
705 ospf_router_lsa_update_area(oi
->area
);
707 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
) {
708 vl_area
= ospf_area_lookup_by_area_id(
709 oi
->ospf
, oi
->vl_data
->vl_area_id
);
712 ospf_router_lsa_update_area(vl_area
);
715 /* Dont originate/flush network LSA if the current
716 * router is acting as a HELPER for this neighbour.
718 if (!OSPF_GR_IS_ACTIVE_HELPER(nbr
)) {
719 /* Originate network-LSA. */
720 if (oi
->state
== ISM_DR
) {
721 if (oi
->network_lsa_self
722 && oi
->full_nbrs
== 0) {
724 oi
->network_lsa_self
, oi
->area
);
725 ospf_lsa_unlock(&oi
->network_lsa_self
);
726 oi
->network_lsa_self
= NULL
;
728 ospf_network_lsa_update(oi
);
732 if (state
== NSM_Full
&& oi
->ospf
->gr_info
.restart_in_progress
)
733 ospf_gr_check_adjs(oi
->ospf
);
736 ospf_opaque_nsm_change(nbr
, old_state
);
738 /* State changes from > ExStart to <= ExStart should clear any Exchange
739 * or Full/LSA Update related lists and state.
740 * Potential causal events: BadLSReq, SeqNumberMismatch, AdjOK?
742 if ((old_state
> NSM_ExStart
) && (state
<= NSM_ExStart
))
745 /* Start DD exchange protocol */
746 if (state
== NSM_ExStart
) {
747 if (nbr
->dd_seqnum
== 0)
748 nbr
->dd_seqnum
= (uint32_t)frr_weak_random();
753 OSPF_DD_FLAG_I
| OSPF_DD_FLAG_M
| OSPF_DD_FLAG_MS
;
754 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
756 "%s: Initializing [DD]: %pI4 with seqnum:%x , flags:%x",
757 (oi
->ospf
->name
) ? oi
->ospf
->name
759 &nbr
->router_id
, nbr
->dd_seqnum
,
761 ospf_db_desc_send(nbr
);
764 /* clear cryptographic sequence number */
765 if (state
== NSM_Down
)
766 nbr
->crypt_seqnum
= 0;
768 if (nbr
->bfd_session
)
769 ospf_bfd_trigger_event(nbr
, old_state
, state
);
771 /* Preserve old status? */
774 /* Execute NSM event process. */
775 int ospf_nsm_event(struct thread
*thread
)
779 struct ospf_neighbor
*nbr
;
781 nbr
= THREAD_ARG(thread
);
782 event
= THREAD_VAL(thread
);
784 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
785 zlog_debug("NSM[%s:%pI4:%s]: %s (%s)", IF_NAME(nbr
->oi
),
787 ospf_get_name(nbr
->oi
->ospf
),
788 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
789 ospf_nsm_event_str
[event
]);
791 next_state
= NSM
[nbr
->state
][event
].next_state
;
794 if (NSM
[nbr
->state
][event
].func
!= NULL
) {
795 int func_state
= (*(NSM
[nbr
->state
][event
].func
))(nbr
);
797 if (NSM
[nbr
->state
][event
].next_state
== NSM_DependUpon
)
798 next_state
= func_state
;
799 else if (func_state
) {
800 /* There's a mismatch between the FSM tables and what an
802 * action/state-change function returned. State changes
804 * do not have conditional/DependUpon next-states should
806 * try set next_state.
809 EC_OSPF_FSM_INVALID_STATE
,
810 "NSM[%s:%pI4:%s]: %s (%s): Warning: action tried to change next_state to %s",
811 IF_NAME(nbr
->oi
), &nbr
->router_id
,
812 ospf_get_name(nbr
->oi
->ospf
),
813 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
815 ospf_nsm_event_str
[event
],
816 lookup_msg(ospf_nsm_state_msg
, func_state
,
821 assert(next_state
!= NSM_DependUpon
);
823 /* If state is changed. */
824 if (next_state
!= nbr
->state
) {
825 int old_state
= nbr
->state
;
827 nsm_notice_state_change(nbr
, next_state
, event
);
828 nsm_change_state(nbr
, next_state
);
830 hook_call(ospf_nsm_change
, nbr
, next_state
, old_state
);
833 /* Make sure timer is set. */
836 /* When event is NSM_KillNbr, InactivityTimer or LLDown, the neighbor
839 * Rather than encode knowledge here of which events lead to NBR
840 * delete, we take our cue from the NSM table, via the dummy
841 * 'Deleted' neighbour state.
843 if (nbr
->state
== NSM_Deleted
)
844 ospf_nbr_delete(nbr
);
849 /* Check loading state. */
850 void ospf_check_nbr_loading(struct ospf_neighbor
*nbr
)
852 if (nbr
->state
== NSM_Loading
) {
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
);