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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"
47 /* Fill in the the 'key' as appropriate to retrieve the entry for nbr
48 * from the ospf_interface's nbrs table. Indexed by interface address
49 * for all cases except Virtual-link and PointToPoint interfaces, where
50 * neighbours are indexed by router-ID instead.
52 static void ospf_nbr_key(struct ospf_interface
*oi
, struct ospf_neighbor
*nbr
,
55 key
->family
= AF_INET
;
56 key
->prefixlen
= IPV4_MAX_BITLEN
;
58 /* vlinks are indexed by router-id */
59 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
60 || oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
61 key
->u
.prefix4
= nbr
->router_id
;
63 key
->u
.prefix4
= nbr
->src
;
67 struct ospf_neighbor
*ospf_nbr_new(struct ospf_interface
*oi
)
69 struct ospf_neighbor
*nbr
;
71 /* Allcate new neighbor. */
72 nbr
= XCALLOC(MTYPE_OSPF_NEIGHBOR
, sizeof(struct ospf_neighbor
));
74 /* Relate neighbor to the interface. */
77 /* Set default values. */
78 nbr
->state
= NSM_Down
;
80 /* Set inheritance values. */
81 nbr
->v_inactivity
= OSPF_IF_PARAM(oi
, v_wait
);
82 nbr
->v_db_desc
= OSPF_IF_PARAM(oi
, retransmit_interval
);
83 nbr
->v_ls_req
= OSPF_IF_PARAM(oi
, retransmit_interval
);
84 nbr
->v_ls_upd
= OSPF_IF_PARAM(oi
, retransmit_interval
);
88 nbr
->dd_flags
= OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_M
| OSPF_DD_FLAG_I
;
90 /* Last received and sent DD. */
91 nbr
->last_send
= NULL
;
95 ospf_lsdb_init(&nbr
->db_sum
);
96 ospf_lsdb_init(&nbr
->ls_rxmt
);
97 ospf_lsdb_init(&nbr
->ls_req
);
99 nbr
->crypt_seqnum
= 0;
101 ospf_bfd_info_nbr_create(oi
, nbr
);
105 void ospf_nbr_free(struct ospf_neighbor
*nbr
)
107 /* Free DB summary list. */
108 if (ospf_db_summary_count(nbr
))
109 ospf_db_summary_clear(nbr
);
110 /* ospf_db_summary_delete_all (nbr); */
112 /* Free ls request list. */
113 if (ospf_ls_request_count(nbr
))
114 ospf_ls_request_delete_all(nbr
);
116 /* Free retransmit list. */
117 if (ospf_ls_retransmit_count(nbr
))
118 ospf_ls_retransmit_clear(nbr
);
121 ospf_lsdb_cleanup(&nbr
->db_sum
);
122 ospf_lsdb_cleanup(&nbr
->ls_req
);
123 ospf_lsdb_cleanup(&nbr
->ls_rxmt
);
125 /* Clear last send packet. */
127 ospf_packet_free(nbr
->last_send
);
130 nbr
->nbr_nbma
->nbr
= NULL
;
131 nbr
->nbr_nbma
= NULL
;
134 /* Cancel all timers. */
135 OSPF_NSM_TIMER_OFF(nbr
->t_inactivity
);
136 OSPF_NSM_TIMER_OFF(nbr
->t_db_desc
);
137 OSPF_NSM_TIMER_OFF(nbr
->t_ls_req
);
138 OSPF_NSM_TIMER_OFF(nbr
->t_ls_upd
);
140 /* Cancel all events. */ /* Thread lookup cost would be negligible. */
141 thread_cancel_event(master
, nbr
);
143 ospf_bfd_info_free(&nbr
->bfd_info
);
146 XFREE(MTYPE_OSPF_NEIGHBOR
, nbr
);
149 /* Delete specified OSPF neighbor from interface. */
150 void ospf_nbr_delete(struct ospf_neighbor
*nbr
)
152 struct ospf_interface
*oi
;
153 struct route_node
*rn
;
158 /* get appropriate prefix 'key' */
159 ospf_nbr_key(oi
, nbr
, &p
);
161 rn
= route_node_lookup(oi
->nbrs
, &p
);
163 /* If lookup for a NBR succeeds, the leaf route_node could
164 * only exist because there is (or was) a nbr there.
165 * If the nbr was deleted, the leaf route_node should have
166 * lost its last refcount too, and be deleted.
167 * Therefore a looked-up leaf route_node in nbrs table
168 * should never have NULL info.
174 route_unlock_node(rn
);
176 zlog_info("Can't find neighbor %s in the interface %s",
177 inet_ntoa(nbr
->src
), IF_NAME(oi
));
179 route_unlock_node(rn
);
182 * This neighbor was not found, but before we move on and
183 * free the neighbor structre, make sure that it was not
184 * indexed incorrectly and ended up in the "worng" place
187 /* Reverse the lookup rules */
188 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
189 || oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
190 p
.u
.prefix4
= nbr
->src
;
192 p
.u
.prefix4
= nbr
->router_id
;
194 rn
= route_node_lookup(oi
->nbrs
, &p
);
196 /* We found the neighbor!
197 * Now make sure it is not the exact same neighbor
198 * structure that we are about to free
200 if (nbr
== rn
->info
) {
201 /* Same neighbor, drop the reference to it */
203 route_unlock_node(rn
);
205 route_unlock_node(rn
);
209 /* Free ospf_neighbor structure. */
213 /* Check myself is in the neighbor list. */
214 int ospf_nbr_bidirectional(struct in_addr
*router_id
, struct in_addr
*neighbors
,
220 max
= size
/ sizeof(struct in_addr
);
222 for (i
= 0; i
< max
; i
++)
223 if (IPV4_ADDR_SAME(router_id
, &neighbors
[i
]))
230 void ospf_nbr_self_reset(struct ospf_interface
*oi
, struct in_addr router_id
)
233 ospf_nbr_delete(oi
->nbr_self
);
235 oi
->nbr_self
= ospf_nbr_new(oi
);
236 ospf_nbr_add_self(oi
, router_id
);
239 /* Add self to nbr list. */
240 void ospf_nbr_add_self(struct ospf_interface
*oi
, struct in_addr router_id
)
243 struct route_node
*rn
;
246 oi
->nbr_self
= ospf_nbr_new(oi
);
249 oi
->nbr_self
->address
= *oi
->address
;
250 oi
->nbr_self
->priority
= OSPF_IF_PARAM(oi
, priority
);
251 oi
->nbr_self
->router_id
= router_id
;
252 oi
->nbr_self
->src
= oi
->address
->u
.prefix4
;
253 oi
->nbr_self
->state
= NSM_TwoWay
;
255 switch (oi
->area
->external_routing
) {
256 case OSPF_AREA_DEFAULT
:
257 SET_FLAG(oi
->nbr_self
->options
, OSPF_OPTION_E
);
260 UNSET_FLAG(oi
->nbr_self
->options
, OSPF_OPTION_E
);
263 UNSET_FLAG(oi
->nbr_self
->options
, OSPF_OPTION_E
);
264 SET_FLAG(oi
->nbr_self
->options
, OSPF_OPTION_NP
);
268 /* Add nbr_self to nbrs table */
269 ospf_nbr_key(oi
, oi
->nbr_self
, &p
);
271 rn
= route_node_get(oi
->nbrs
, &p
);
273 /* There is already pseudo neighbor. */
274 if (IS_DEBUG_OSPF_EVENT
)
276 "router_id %s already present in neighbor table. node refcount %u",
277 inet_ntoa(router_id
), rn
->lock
);
278 route_unlock_node(rn
);
280 rn
->info
= oi
->nbr_self
;
283 /* Get neighbor count by status.
284 Specify status = 0, get all neighbor other than myself. */
285 int ospf_nbr_count(struct ospf_interface
*oi
, int state
)
287 struct ospf_neighbor
*nbr
;
288 struct route_node
*rn
;
291 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
292 if ((nbr
= rn
->info
))
293 if (!IPV4_ADDR_SAME(&nbr
->router_id
,
294 &oi
->ospf
->router_id
))
295 if (state
== 0 || nbr
->state
== state
)
301 int ospf_nbr_count_opaque_capable(struct ospf_interface
*oi
)
303 struct ospf_neighbor
*nbr
;
304 struct route_node
*rn
;
307 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
308 if ((nbr
= rn
->info
))
309 if (!IPV4_ADDR_SAME(&nbr
->router_id
,
310 &oi
->ospf
->router_id
))
311 if (nbr
->state
== NSM_Full
)
312 if (CHECK_FLAG(nbr
->options
,
319 /* lookup nbr by address - use this only if you know you must
320 * otherwise use the ospf_nbr_lookup() wrapper, which deals
321 * with virtual link and PointToPoint neighbours
323 struct ospf_neighbor
*ospf_nbr_lookup_by_addr(struct route_table
*nbrs
,
324 struct in_addr
*addr
)
327 struct route_node
*rn
;
328 struct ospf_neighbor
*nbr
;
331 p
.prefixlen
= IPV4_MAX_BITLEN
;
334 rn
= route_node_lookup(nbrs
, &p
);
338 /* See comment in ospf_nbr_delete */
341 if (rn
->info
== NULL
) {
342 route_unlock_node(rn
);
346 nbr
= (struct ospf_neighbor
*)rn
->info
;
347 route_unlock_node(rn
);
352 struct ospf_neighbor
*ospf_nbr_lookup_by_routerid(struct route_table
*nbrs
,
355 struct route_node
*rn
;
356 struct ospf_neighbor
*nbr
;
358 for (rn
= route_top(nbrs
); rn
; rn
= route_next(rn
))
359 if ((nbr
= rn
->info
) != NULL
)
360 if (IPV4_ADDR_SAME(&nbr
->router_id
, id
)) {
361 route_unlock_node(rn
);
368 void ospf_renegotiate_optional_capabilities(struct ospf
*top
)
370 struct listnode
*node
;
371 struct ospf_interface
*oi
;
372 struct route_table
*nbrs
;
373 struct route_node
*rn
;
374 struct ospf_neighbor
*nbr
;
376 /* At first, flush self-originated LSAs from routing domain. */
377 ospf_flush_self_originated_lsas_now(top
);
379 /* Revert all neighbor status to ExStart. */
380 for (ALL_LIST_ELEMENTS_RO(top
->oiflist
, node
, oi
)) {
381 if ((nbrs
= oi
->nbrs
) == NULL
)
384 for (rn
= route_top(nbrs
); rn
; rn
= route_next(rn
)) {
385 if ((nbr
= rn
->info
) == NULL
|| nbr
== oi
->nbr_self
)
388 if (nbr
->state
< NSM_ExStart
)
391 if (IS_DEBUG_OSPF_EVENT
)
393 "Renegotiate optional capabilities with neighbor(%s)",
394 inet_ntoa(nbr
->router_id
));
396 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
404 struct ospf_neighbor
*ospf_nbr_lookup(struct ospf_interface
*oi
, struct ip
*iph
,
405 struct ospf_header
*ospfh
)
407 struct in_addr srcaddr
= iph
->ip_src
;
409 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
410 || oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
411 return (ospf_nbr_lookup_by_routerid(oi
->nbrs
,
414 return (ospf_nbr_lookup_by_addr(oi
->nbrs
, &srcaddr
));
417 static struct ospf_neighbor
*ospf_nbr_add(struct ospf_interface
*oi
,
418 struct ospf_header
*ospfh
,
421 struct ospf_neighbor
*nbr
;
423 nbr
= ospf_nbr_new(oi
);
424 nbr
->state
= NSM_Down
;
425 nbr
->src
= p
->u
.prefix4
;
426 memcpy(&nbr
->address
, p
, sizeof(struct prefix
));
428 nbr
->nbr_nbma
= NULL
;
429 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
430 struct ospf_nbr_nbma
*nbr_nbma
;
431 struct listnode
*node
;
433 for (ALL_LIST_ELEMENTS_RO(oi
->nbr_nbma
, node
, nbr_nbma
)) {
434 if (IPV4_ADDR_SAME(&nbr_nbma
->addr
, &nbr
->src
)) {
436 nbr
->nbr_nbma
= nbr_nbma
;
438 if (nbr_nbma
->t_poll
)
439 OSPF_POLL_TIMER_OFF(nbr_nbma
->t_poll
);
441 nbr
->state_change
= nbr_nbma
->state_change
+ 1;
446 /* New nbr, save the crypto sequence number if necessary */
447 if (ntohs(ospfh
->auth_type
) == OSPF_AUTH_CRYPTOGRAPHIC
)
448 nbr
->crypt_seqnum
= ospfh
->u
.crypt
.crypt_seqnum
;
450 if (IS_DEBUG_OSPF_EVENT
)
451 zlog_debug("NSM[%s:%s]: start", IF_NAME(oi
),
452 inet_ntoa(nbr
->router_id
));
457 struct ospf_neighbor
*ospf_nbr_get(struct ospf_interface
*oi
,
458 struct ospf_header
*ospfh
, struct ip
*iph
,
461 struct route_node
*rn
;
463 struct ospf_neighbor
*nbr
;
465 key
.family
= AF_INET
;
466 key
.prefixlen
= IPV4_MAX_BITLEN
;
468 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
469 || oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
470 key
.u
.prefix4
= ospfh
->router_id
; /* index vlink and ptp nbrs by
473 key
.u
.prefix4
= iph
->ip_src
;
475 rn
= route_node_get(oi
->nbrs
, &key
);
477 route_unlock_node(rn
);
480 if (oi
->type
== OSPF_IFTYPE_NBMA
&& nbr
->state
== NSM_Attempt
) {
481 nbr
->src
= iph
->ip_src
;
482 memcpy(&nbr
->address
, p
, sizeof(struct prefix
));
485 rn
->info
= nbr
= ospf_nbr_add(oi
, ospfh
, p
);
488 nbr
->router_id
= ospfh
->router_id
;