]>
git.proxmox.com Git - mirror_frr.git/blob - ospfd/ospf_neighbor.c
2 * OSPF Neighbor functions.
3 * Copyright (C) 1999, 2000 Toshiaki Takada
5 * This file is part of GNU Zebra.
7 * GNU Zebra is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published
9 * by the Free Software Foundation; either version 2, or (at your
10 * option) any later version.
12 * GNU Zebra is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; see the file COPYING; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
34 #include "ospfd/ospfd.h"
35 #include "ospfd/ospf_interface.h"
36 #include "ospfd/ospf_asbr.h"
37 #include "ospfd/ospf_lsa.h"
38 #include "ospfd/ospf_lsdb.h"
39 #include "ospfd/ospf_neighbor.h"
40 #include "ospfd/ospf_nsm.h"
41 #include "ospfd/ospf_packet.h"
42 #include "ospfd/ospf_network.h"
43 #include "ospfd/ospf_flood.h"
44 #include "ospfd/ospf_dump.h"
45 #include "ospfd/ospf_bfd.h"
46 #include "ospfd/ospf_gr_helper.h"
48 /* Fill in the the 'key' as appropriate to retrieve the entry for nbr
49 * from the ospf_interface's nbrs table. Indexed by interface address
50 * for all cases except Virtual-link and PointToPoint interfaces, where
51 * neighbours are indexed by router-ID instead.
53 static void ospf_nbr_key(struct ospf_interface
*oi
, struct ospf_neighbor
*nbr
,
56 key
->family
= AF_INET
;
57 key
->prefixlen
= IPV4_MAX_BITLEN
;
59 /* vlinks are indexed by router-id */
60 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
61 || oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
62 key
->u
.prefix4
= nbr
->router_id
;
64 key
->u
.prefix4
= nbr
->src
;
68 struct ospf_neighbor
*ospf_nbr_new(struct ospf_interface
*oi
)
70 struct ospf_neighbor
*nbr
;
72 /* Allcate new neighbor. */
73 nbr
= XCALLOC(MTYPE_OSPF_NEIGHBOR
, sizeof(struct ospf_neighbor
));
75 /* Relate neighbor to the interface. */
78 /* Set default values. */
79 nbr
->state
= NSM_Down
;
81 /* Set inheritance values. */
82 nbr
->v_inactivity
= OSPF_IF_PARAM(oi
, v_wait
);
83 nbr
->v_db_desc
= OSPF_IF_PARAM(oi
, retransmit_interval
);
84 nbr
->v_ls_req
= OSPF_IF_PARAM(oi
, retransmit_interval
);
85 nbr
->v_ls_upd
= OSPF_IF_PARAM(oi
, retransmit_interval
);
89 nbr
->dd_flags
= OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_M
| OSPF_DD_FLAG_I
;
91 /* Last received and sent DD. */
92 nbr
->last_send
= NULL
;
96 ospf_lsdb_init(&nbr
->db_sum
);
97 ospf_lsdb_init(&nbr
->ls_rxmt
);
98 ospf_lsdb_init(&nbr
->ls_req
);
100 nbr
->crypt_seqnum
= 0;
102 ospf_bfd_info_nbr_create(oi
, nbr
);
104 /* Initialize GR Helper info*/
105 nbr
->gr_helper_info
.recvd_grace_period
= 0;
106 nbr
->gr_helper_info
.actual_grace_period
= 0;
107 nbr
->gr_helper_info
.gr_helper_status
= OSPF_GR_NOT_HELPER
;
108 nbr
->gr_helper_info
.helper_exit_reason
= OSPF_GR_HELPER_EXIT_NONE
;
109 nbr
->gr_helper_info
.gr_restart_reason
= OSPF_GR_UNKNOWN_RESTART
;
114 void ospf_nbr_free(struct ospf_neighbor
*nbr
)
116 /* Free DB summary list. */
117 if (ospf_db_summary_count(nbr
))
118 ospf_db_summary_clear(nbr
);
119 /* ospf_db_summary_delete_all (nbr); */
121 /* Free ls request list. */
122 if (ospf_ls_request_count(nbr
))
123 ospf_ls_request_delete_all(nbr
);
125 /* Free retransmit list. */
126 if (ospf_ls_retransmit_count(nbr
))
127 ospf_ls_retransmit_clear(nbr
);
130 ospf_lsdb_cleanup(&nbr
->db_sum
);
131 ospf_lsdb_cleanup(&nbr
->ls_req
);
132 ospf_lsdb_cleanup(&nbr
->ls_rxmt
);
134 /* Clear last send packet. */
136 ospf_packet_free(nbr
->last_send
);
139 nbr
->nbr_nbma
->nbr
= NULL
;
140 nbr
->nbr_nbma
= NULL
;
143 /* Cancel all timers. */
144 OSPF_NSM_TIMER_OFF(nbr
->t_inactivity
);
145 OSPF_NSM_TIMER_OFF(nbr
->t_db_desc
);
146 OSPF_NSM_TIMER_OFF(nbr
->t_ls_req
);
147 OSPF_NSM_TIMER_OFF(nbr
->t_ls_upd
);
149 /* Cancel all events. */ /* Thread lookup cost would be negligible. */
150 thread_cancel_event(master
, nbr
);
152 ospf_bfd_info_free(&nbr
->bfd_info
);
154 OSPF_NSM_TIMER_OFF(nbr
->gr_helper_info
.t_grace_timer
);
157 XFREE(MTYPE_OSPF_NEIGHBOR
, nbr
);
160 /* Delete specified OSPF neighbor from interface. */
161 void ospf_nbr_delete(struct ospf_neighbor
*nbr
)
163 struct ospf_interface
*oi
;
164 struct route_node
*rn
;
169 /* get appropriate prefix 'key' */
170 ospf_nbr_key(oi
, nbr
, &p
);
172 rn
= route_node_lookup(oi
->nbrs
, &p
);
174 /* If lookup for a NBR succeeds, the leaf route_node could
175 * only exist because there is (or was) a nbr there.
176 * If the nbr was deleted, the leaf route_node should have
177 * lost its last refcount too, and be deleted.
178 * Therefore a looked-up leaf route_node in nbrs table
179 * should never have NULL info.
185 route_unlock_node(rn
);
187 zlog_info("Can't find neighbor %s in the interface %s",
188 inet_ntoa(nbr
->src
), IF_NAME(oi
));
190 route_unlock_node(rn
);
193 * This neighbor was not found, but before we move on and
194 * free the neighbor structre, make sure that it was not
195 * indexed incorrectly and ended up in the "worng" place
198 /* Reverse the lookup rules */
199 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
200 || oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
201 p
.u
.prefix4
= nbr
->src
;
203 p
.u
.prefix4
= nbr
->router_id
;
205 rn
= route_node_lookup(oi
->nbrs
, &p
);
207 /* We found the neighbor!
208 * Now make sure it is not the exact same neighbor
209 * structure that we are about to free
211 if (nbr
== rn
->info
) {
212 /* Same neighbor, drop the reference to it */
214 route_unlock_node(rn
);
216 route_unlock_node(rn
);
220 /* Free ospf_neighbor structure. */
224 /* Check myself is in the neighbor list. */
225 int ospf_nbr_bidirectional(struct in_addr
*router_id
, struct in_addr
*neighbors
,
231 max
= size
/ sizeof(struct in_addr
);
233 for (i
= 0; i
< max
; i
++)
234 if (IPV4_ADDR_SAME(router_id
, &neighbors
[i
]))
241 void ospf_nbr_self_reset(struct ospf_interface
*oi
, struct in_addr router_id
)
244 ospf_nbr_delete(oi
->nbr_self
);
246 oi
->nbr_self
= ospf_nbr_new(oi
);
247 ospf_nbr_add_self(oi
, router_id
);
250 /* Add self to nbr list. */
251 void ospf_nbr_add_self(struct ospf_interface
*oi
, struct in_addr router_id
)
254 struct route_node
*rn
;
257 oi
->nbr_self
= ospf_nbr_new(oi
);
260 oi
->nbr_self
->address
= *oi
->address
;
261 oi
->nbr_self
->priority
= OSPF_IF_PARAM(oi
, priority
);
262 oi
->nbr_self
->router_id
= router_id
;
263 oi
->nbr_self
->src
= oi
->address
->u
.prefix4
;
264 oi
->nbr_self
->state
= NSM_TwoWay
;
266 switch (oi
->area
->external_routing
) {
267 case OSPF_AREA_DEFAULT
:
268 SET_FLAG(oi
->nbr_self
->options
, OSPF_OPTION_E
);
271 UNSET_FLAG(oi
->nbr_self
->options
, OSPF_OPTION_E
);
274 UNSET_FLAG(oi
->nbr_self
->options
, OSPF_OPTION_E
);
275 SET_FLAG(oi
->nbr_self
->options
, OSPF_OPTION_NP
);
279 /* Add nbr_self to nbrs table */
280 ospf_nbr_key(oi
, oi
->nbr_self
, &p
);
282 rn
= route_node_get(oi
->nbrs
, &p
);
284 /* There is already pseudo neighbor. */
285 if (IS_DEBUG_OSPF_EVENT
)
287 "router_id %s already present in neighbor table. node refcount %u",
288 inet_ntoa(router_id
),
289 route_node_get_lock_count(rn
));
290 route_unlock_node(rn
);
292 rn
->info
= oi
->nbr_self
;
295 /* Get neighbor count by status.
296 Specify status = 0, get all neighbor other than myself. */
297 int ospf_nbr_count(struct ospf_interface
*oi
, int state
)
299 struct ospf_neighbor
*nbr
;
300 struct route_node
*rn
;
303 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
304 if ((nbr
= rn
->info
))
305 if (!IPV4_ADDR_SAME(&nbr
->router_id
,
306 &oi
->ospf
->router_id
))
307 if (state
== 0 || nbr
->state
== state
)
313 int ospf_nbr_count_opaque_capable(struct ospf_interface
*oi
)
315 struct ospf_neighbor
*nbr
;
316 struct route_node
*rn
;
319 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
320 if ((nbr
= rn
->info
))
321 if (!IPV4_ADDR_SAME(&nbr
->router_id
,
322 &oi
->ospf
->router_id
))
323 if (nbr
->state
== NSM_Full
)
324 if (CHECK_FLAG(nbr
->options
,
331 /* lookup nbr by address - use this only if you know you must
332 * otherwise use the ospf_nbr_lookup() wrapper, which deals
333 * with virtual link and PointToPoint neighbours
335 struct ospf_neighbor
*ospf_nbr_lookup_by_addr(struct route_table
*nbrs
,
336 struct in_addr
*addr
)
339 struct route_node
*rn
;
340 struct ospf_neighbor
*nbr
;
343 p
.prefixlen
= IPV4_MAX_BITLEN
;
346 rn
= route_node_lookup(nbrs
, &p
);
350 /* See comment in ospf_nbr_delete */
353 if (rn
->info
== NULL
) {
354 route_unlock_node(rn
);
358 nbr
= (struct ospf_neighbor
*)rn
->info
;
359 route_unlock_node(rn
);
364 struct ospf_neighbor
*ospf_nbr_lookup_by_routerid(struct route_table
*nbrs
,
367 struct route_node
*rn
;
368 struct ospf_neighbor
*nbr
;
370 for (rn
= route_top(nbrs
); rn
; rn
= route_next(rn
))
371 if ((nbr
= rn
->info
) != NULL
)
372 if (IPV4_ADDR_SAME(&nbr
->router_id
, id
)) {
373 route_unlock_node(rn
);
380 void ospf_renegotiate_optional_capabilities(struct ospf
*top
)
382 struct listnode
*node
;
383 struct ospf_interface
*oi
;
384 struct route_table
*nbrs
;
385 struct route_node
*rn
;
386 struct ospf_neighbor
*nbr
;
388 /* At first, flush self-originated LSAs from routing domain. */
389 ospf_flush_self_originated_lsas_now(top
);
391 /* Revert all neighbor status to ExStart. */
392 for (ALL_LIST_ELEMENTS_RO(top
->oiflist
, node
, oi
)) {
393 if ((nbrs
= oi
->nbrs
) == NULL
)
396 for (rn
= route_top(nbrs
); rn
; rn
= route_next(rn
)) {
397 if ((nbr
= rn
->info
) == NULL
|| nbr
== oi
->nbr_self
)
400 if (nbr
->state
< NSM_ExStart
)
403 if (IS_DEBUG_OSPF_EVENT
)
405 "Renegotiate optional capabilities with neighbor(%s)",
406 inet_ntoa(nbr
->router_id
));
408 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
416 struct ospf_neighbor
*ospf_nbr_lookup(struct ospf_interface
*oi
, struct ip
*iph
,
417 struct ospf_header
*ospfh
)
419 struct in_addr srcaddr
= iph
->ip_src
;
421 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
422 || oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
423 return (ospf_nbr_lookup_by_routerid(oi
->nbrs
,
426 return (ospf_nbr_lookup_by_addr(oi
->nbrs
, &srcaddr
));
429 static struct ospf_neighbor
*ospf_nbr_add(struct ospf_interface
*oi
,
430 struct ospf_header
*ospfh
,
433 struct ospf_neighbor
*nbr
;
435 nbr
= ospf_nbr_new(oi
);
436 nbr
->state
= NSM_Down
;
437 nbr
->src
= p
->u
.prefix4
;
438 memcpy(&nbr
->address
, p
, sizeof(struct prefix
));
440 nbr
->nbr_nbma
= NULL
;
441 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
442 struct ospf_nbr_nbma
*nbr_nbma
;
443 struct listnode
*node
;
445 for (ALL_LIST_ELEMENTS_RO(oi
->nbr_nbma
, node
, nbr_nbma
)) {
446 if (IPV4_ADDR_SAME(&nbr_nbma
->addr
, &nbr
->src
)) {
448 nbr
->nbr_nbma
= nbr_nbma
;
450 if (nbr_nbma
->t_poll
)
451 OSPF_POLL_TIMER_OFF(nbr_nbma
->t_poll
);
453 nbr
->state_change
= nbr_nbma
->state_change
+ 1;
458 /* New nbr, save the crypto sequence number if necessary */
459 if (ntohs(ospfh
->auth_type
) == OSPF_AUTH_CRYPTOGRAPHIC
)
460 nbr
->crypt_seqnum
= ospfh
->u
.crypt
.crypt_seqnum
;
462 if (IS_DEBUG_OSPF_EVENT
)
463 zlog_debug("NSM[%s:%s]: start", IF_NAME(oi
),
464 inet_ntoa(nbr
->router_id
));
469 struct ospf_neighbor
*ospf_nbr_get(struct ospf_interface
*oi
,
470 struct ospf_header
*ospfh
, struct ip
*iph
,
473 struct route_node
*rn
;
475 struct ospf_neighbor
*nbr
;
477 key
.family
= AF_INET
;
478 key
.prefixlen
= IPV4_MAX_BITLEN
;
480 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
481 || oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
482 key
.u
.prefix4
= ospfh
->router_id
; /* index vlink and ptp nbrs by
485 key
.u
.prefix4
= iph
->ip_src
;
487 rn
= route_node_get(oi
->nbrs
, &key
);
489 route_unlock_node(rn
);
492 if (oi
->type
== OSPF_IFTYPE_NBMA
&& nbr
->state
== NSM_Attempt
) {
493 nbr
->src
= iph
->ip_src
;
494 memcpy(&nbr
->address
, p
, sizeof(struct prefix
));
497 rn
->info
= nbr
= ospf_nbr_add(oi
, ospfh
, p
);
500 nbr
->router_id
= ospfh
->router_id
;