2 * IS-IS Rout(e)ing protocol - isis_route.c
3 * Copyright (C) 2001,2002 Sampo Saaristo
4 * Tampere University of Technology
5 * Institute of Communications Engineering
7 * based on ../ospf6d/ospf6_route.[ch]
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public Licenseas published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
15 * This program is distributed in the hope that it will be useful,but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
37 #include "isis_constants.h"
38 #include "isis_common.h"
39 #include "isis_flags.h"
42 #include "isis_misc.h"
43 #include "isis_adjacency.h"
44 #include "isis_circuit.h"
49 #include "isis_route.h"
50 #include "isis_zebra.h"
52 static struct isis_nexthop
*
53 isis_nexthop_create (struct in_addr
*ip
, ifindex_t ifindex
)
55 struct listnode
*node
;
56 struct isis_nexthop
*nexthop
;
58 for (ALL_LIST_ELEMENTS_RO (isis
->nexthops
, node
, nexthop
))
60 if (nexthop
->ifindex
!= ifindex
)
62 if (ip
&& memcmp (&nexthop
->ip
, ip
, sizeof (struct in_addr
)) != 0)
69 nexthop
= XCALLOC (MTYPE_ISIS_NEXTHOP
, sizeof (struct isis_nexthop
));
71 nexthop
->ifindex
= ifindex
;
72 memcpy (&nexthop
->ip
, ip
, sizeof (struct in_addr
));
73 listnode_add (isis
->nexthops
, nexthop
);
80 isis_nexthop_delete (struct isis_nexthop
*nexthop
)
83 if (nexthop
->lock
== 0)
85 listnode_delete (isis
->nexthops
, nexthop
);
86 XFREE (MTYPE_ISIS_NEXTHOP
, nexthop
);
93 nexthoplookup (struct list
*nexthops
, struct in_addr
*ip
,
96 struct listnode
*node
;
97 struct isis_nexthop
*nh
;
99 for (ALL_LIST_ELEMENTS_RO (nexthops
, node
, nh
))
101 if (!(memcmp (ip
, &nh
->ip
, sizeof (struct in_addr
))) &&
102 ifindex
== nh
->ifindex
)
111 nexthop_print (struct isis_nexthop
*nh
)
115 inet_ntop (AF_INET
, &nh
->ip
, (char *) buf
, BUFSIZ
);
117 zlog_debug (" %s %u", buf
, nh
->ifindex
);
121 nexthops_print (struct list
*nhs
)
123 struct listnode
*node
;
124 struct isis_nexthop
*nh
;
126 for (ALL_LIST_ELEMENTS_RO (nhs
, node
, nh
))
129 #endif /* EXTREME_DEBUG */
132 static struct isis_nexthop6
*
133 isis_nexthop6_new (struct in6_addr
*ip6
, ifindex_t ifindex
)
135 struct isis_nexthop6
*nexthop6
;
137 nexthop6
= XCALLOC (MTYPE_ISIS_NEXTHOP6
, sizeof (struct isis_nexthop6
));
139 nexthop6
->ifindex
= ifindex
;
140 memcpy (&nexthop6
->ip6
, ip6
, sizeof (struct in6_addr
));
146 static struct isis_nexthop6
*
147 isis_nexthop6_create (struct in6_addr
*ip6
, ifindex_t ifindex
)
149 struct listnode
*node
;
150 struct isis_nexthop6
*nexthop6
;
152 for (ALL_LIST_ELEMENTS_RO (isis
->nexthops6
, node
, nexthop6
))
154 if (nexthop6
->ifindex
!= ifindex
)
156 if (ip6
&& memcmp (&nexthop6
->ip6
, ip6
, sizeof (struct in6_addr
)) != 0)
163 nexthop6
= isis_nexthop6_new (ip6
, ifindex
);
169 isis_nexthop6_delete (struct isis_nexthop6
*nexthop6
)
173 if (nexthop6
->lock
== 0)
175 listnode_delete (isis
->nexthops6
, nexthop6
);
176 XFREE (MTYPE_ISIS_NEXTHOP6
, nexthop6
);
183 nexthop6lookup (struct list
*nexthops6
, struct in6_addr
*ip6
,
186 struct listnode
*node
;
187 struct isis_nexthop6
*nh6
;
189 for (ALL_LIST_ELEMENTS_RO (nexthops6
, node
, nh6
))
191 if (!(memcmp (ip6
, &nh6
->ip6
, sizeof (struct in6_addr
))) &&
192 ifindex
== nh6
->ifindex
)
201 nexthop6_print (struct isis_nexthop6
*nh6
)
205 inet_ntop (AF_INET6
, &nh6
->ip6
, (char *) buf
, BUFSIZ
);
207 zlog_debug (" %s %u", buf
, nh6
->ifindex
);
211 nexthops6_print (struct list
*nhs6
)
213 struct listnode
*node
;
214 struct isis_nexthop6
*nh6
;
216 for (ALL_LIST_ELEMENTS_RO (nhs6
, node
, nh6
))
217 nexthop6_print (nh6
);
219 #endif /* EXTREME_DEBUG */
220 #endif /* HAVE_IPV6 */
223 adjinfo2nexthop (struct list
*nexthops
, struct isis_adjacency
*adj
)
225 struct isis_nexthop
*nh
;
226 struct listnode
*node
;
227 struct in_addr
*ipv4_addr
;
229 if (adj
->ipv4_addrs
== NULL
)
232 for (ALL_LIST_ELEMENTS_RO (adj
->ipv4_addrs
, node
, ipv4_addr
))
234 if (!nexthoplookup (nexthops
, ipv4_addr
,
235 adj
->circuit
->interface
->ifindex
))
237 nh
= isis_nexthop_create (ipv4_addr
,
238 adj
->circuit
->interface
->ifindex
);
239 nh
->router_address
= adj
->router_address
;
240 listnode_add (nexthops
, nh
);
247 adjinfo2nexthop6 (struct list
*nexthops6
, struct isis_adjacency
*adj
)
249 struct listnode
*node
;
250 struct in6_addr
*ipv6_addr
;
251 struct isis_nexthop6
*nh6
;
253 if (!adj
->ipv6_addrs
)
256 for (ALL_LIST_ELEMENTS_RO (adj
->ipv6_addrs
, node
, ipv6_addr
))
258 if (!nexthop6lookup (nexthops6
, ipv6_addr
,
259 adj
->circuit
->interface
->ifindex
))
261 nh6
= isis_nexthop6_create (ipv6_addr
,
262 adj
->circuit
->interface
->ifindex
);
263 nh6
->router_address6
= adj
->router_address6
;
264 listnode_add (nexthops6
, nh6
);
268 #endif /* HAVE_IPV6 */
270 static struct isis_route_info
*
271 isis_route_info_new (struct prefix
*prefix
, uint32_t cost
, uint32_t depth
,
272 struct list
*adjacencies
)
274 struct isis_route_info
*rinfo
;
275 struct isis_adjacency
*adj
;
276 struct listnode
*node
;
278 rinfo
= XCALLOC (MTYPE_ISIS_ROUTE_INFO
, sizeof (struct isis_route_info
));
280 if (prefix
->family
== AF_INET
)
282 rinfo
->nexthops
= list_new ();
283 for (ALL_LIST_ELEMENTS_RO (adjacencies
, node
, adj
))
285 /* check for force resync this route */
286 if (CHECK_FLAG (adj
->circuit
->flags
, ISIS_CIRCUIT_FLAPPED_AFTER_SPF
))
287 SET_FLAG (rinfo
->flag
, ISIS_ROUTE_FLAG_ZEBRA_RESYNC
);
288 /* update neighbor router address */
289 if (depth
== 2 && prefix
->prefixlen
== 32)
290 adj
->router_address
= prefix
->u
.prefix4
;
291 adjinfo2nexthop (rinfo
->nexthops
, adj
);
295 if (prefix
->family
== AF_INET6
)
297 rinfo
->nexthops6
= list_new ();
298 for (ALL_LIST_ELEMENTS_RO (adjacencies
, node
, adj
))
300 /* check for force resync this route */
301 if (CHECK_FLAG (adj
->circuit
->flags
, ISIS_CIRCUIT_FLAPPED_AFTER_SPF
))
302 SET_FLAG (rinfo
->flag
, ISIS_ROUTE_FLAG_ZEBRA_RESYNC
);
303 /* update neighbor router address */
304 if (depth
== 2 && prefix
->prefixlen
== 128)
305 adj
->router_address6
= prefix
->u
.prefix6
;
306 adjinfo2nexthop6 (rinfo
->nexthops6
, adj
);
310 #endif /* HAVE_IPV6 */
313 rinfo
->depth
= depth
;
319 isis_route_info_delete (struct isis_route_info
*route_info
)
321 if (route_info
->nexthops
)
323 route_info
->nexthops
->del
= (void (*)(void *)) isis_nexthop_delete
;
324 list_delete (route_info
->nexthops
);
328 if (route_info
->nexthops6
)
330 route_info
->nexthops6
->del
= (void (*)(void *)) isis_nexthop6_delete
;
331 list_delete (route_info
->nexthops6
);
333 #endif /* HAVE_IPV6 */
335 XFREE (MTYPE_ISIS_ROUTE_INFO
, route_info
);
339 isis_route_info_same_attrib (struct isis_route_info
*new,
340 struct isis_route_info
*old
)
342 if (new->cost
!= old
->cost
)
344 if (new->depth
!= old
->depth
)
351 isis_route_info_same (struct isis_route_info
*new,
352 struct isis_route_info
*old
, u_char family
)
354 struct listnode
*node
;
355 struct isis_nexthop
*nexthop
;
357 struct isis_nexthop6
*nexthop6
;
358 #endif /* HAVE_IPV6 */
360 if (!CHECK_FLAG (old
->flag
, ISIS_ROUTE_FLAG_ZEBRA_SYNCED
))
363 if (CHECK_FLAG (new->flag
, ISIS_ROUTE_FLAG_ZEBRA_RESYNC
))
366 if (!isis_route_info_same_attrib (new, old
))
369 if (family
== AF_INET
)
371 for (ALL_LIST_ELEMENTS_RO (new->nexthops
, node
, nexthop
))
372 if (nexthoplookup (old
->nexthops
, &nexthop
->ip
, nexthop
->ifindex
)
376 for (ALL_LIST_ELEMENTS_RO (old
->nexthops
, node
, nexthop
))
377 if (nexthoplookup (new->nexthops
, &nexthop
->ip
, nexthop
->ifindex
)
382 else if (family
== AF_INET6
)
384 for (ALL_LIST_ELEMENTS_RO (new->nexthops6
, node
, nexthop6
))
385 if (nexthop6lookup (old
->nexthops6
, &nexthop6
->ip6
,
386 nexthop6
->ifindex
) == 0)
389 for (ALL_LIST_ELEMENTS_RO (old
->nexthops6
, node
, nexthop6
))
390 if (nexthop6lookup (new->nexthops6
, &nexthop6
->ip6
,
391 nexthop6
->ifindex
) == 0)
394 #endif /* HAVE_IPV6 */
399 struct isis_route_info
*
400 isis_route_create (struct prefix
*prefix
, u_int32_t cost
, u_int32_t depth
,
401 struct list
*adjacencies
, struct isis_area
*area
,
404 struct route_node
*route_node
;
405 struct isis_route_info
*rinfo_new
, *rinfo_old
, *route_info
= NULL
;
406 char buff
[PREFIX2STR_BUFFER
];
409 family
= prefix
->family
;
411 prefix2str (prefix
, buff
, sizeof (buff
));
413 rinfo_new
= isis_route_info_new (prefix
, cost
, depth
, adjacencies
);
415 if (family
== AF_INET
)
416 route_node
= route_node_get (area
->route_table
[level
- 1], prefix
);
418 else if (family
== AF_INET6
)
419 route_node
= route_node_get (area
->route_table6
[level
- 1], prefix
);
420 #endif /* HAVE_IPV6 */
423 isis_route_info_delete (rinfo_new
);
427 rinfo_old
= route_node
->info
;
430 if (isis
->debugs
& DEBUG_RTE_EVENTS
)
431 zlog_debug ("ISIS-Rte (%s) route created: %s", area
->area_tag
, buff
);
432 route_info
= rinfo_new
;
433 UNSET_FLAG (route_info
->flag
, ISIS_ROUTE_FLAG_ZEBRA_SYNCED
);
437 if (isis
->debugs
& DEBUG_RTE_EVENTS
)
438 zlog_debug ("ISIS-Rte (%s) route already exists: %s", area
->area_tag
,
440 if (isis_route_info_same (rinfo_new
, rinfo_old
, family
))
442 if (isis
->debugs
& DEBUG_RTE_EVENTS
)
443 zlog_debug ("ISIS-Rte (%s) route unchanged: %s", area
->area_tag
,
445 isis_route_info_delete (rinfo_new
);
446 route_info
= rinfo_old
;
450 if (isis
->debugs
& DEBUG_RTE_EVENTS
)
451 zlog_debug ("ISIS-Rte (%s) route changed: %s", area
->area_tag
,
453 isis_route_info_delete (rinfo_old
);
454 route_info
= rinfo_new
;
455 UNSET_FLAG (route_info
->flag
, ISIS_ROUTE_FLAG_ZEBRA_SYNCED
);
459 SET_FLAG (route_info
->flag
, ISIS_ROUTE_FLAG_ACTIVE
);
460 route_node
->info
= route_info
;
466 isis_route_delete (struct prefix
*prefix
, struct route_table
*table
)
468 struct route_node
*rode
;
469 struct isis_route_info
*rinfo
;
470 char buff
[PREFIX2STR_BUFFER
];
473 prefix2str (prefix
, buff
, sizeof (buff
));
476 rode
= route_node_get (table
, prefix
);
481 if (isis
->debugs
& DEBUG_RTE_EVENTS
)
482 zlog_debug ("ISIS-Rte: tried to delete non-existant route %s", buff
);
486 if (CHECK_FLAG (rinfo
->flag
, ISIS_ROUTE_FLAG_ZEBRA_SYNCED
))
488 UNSET_FLAG (rinfo
->flag
, ISIS_ROUTE_FLAG_ACTIVE
);
489 if (isis
->debugs
& DEBUG_RTE_EVENTS
)
490 zlog_debug ("ISIS-Rte: route delete %s", buff
);
491 isis_zebra_route_update (prefix
, rinfo
);
493 isis_route_info_delete (rinfo
);
499 /* Validating routes in particular table. */
501 isis_route_validate_table (struct isis_area
*area
, struct route_table
*table
)
503 struct route_node
*rnode
, *drnode
;
504 struct isis_route_info
*rinfo
;
505 char buff
[PREFIX2STR_BUFFER
];
507 for (rnode
= route_top (table
); rnode
; rnode
= route_next (rnode
))
509 if (rnode
->info
== NULL
)
513 if (isis
->debugs
& DEBUG_RTE_EVENTS
)
515 prefix2str (&rnode
->p
, buff
, sizeof (buff
));
516 zlog_debug ("ISIS-Rte (%s): route validate: %s %s %s %s",
518 (CHECK_FLAG (rinfo
->flag
, ISIS_ROUTE_FLAG_ZEBRA_SYNCED
) ?
519 "synced" : "not-synced"),
520 (CHECK_FLAG (rinfo
->flag
, ISIS_ROUTE_FLAG_ZEBRA_RESYNC
) ?
521 "resync" : "not-resync"),
522 (CHECK_FLAG (rinfo
->flag
, ISIS_ROUTE_FLAG_ACTIVE
) ?
523 "active" : "inactive"), buff
);
526 isis_zebra_route_update (&rnode
->p
, rinfo
);
527 if (!CHECK_FLAG (rinfo
->flag
, ISIS_ROUTE_FLAG_ACTIVE
))
529 /* Area is either L1 or L2 => we use level route tables directly for
530 * validating => no problems with deleting routes. */
531 if (area
->is_type
!= IS_LEVEL_1_AND_2
)
533 isis_route_delete (&rnode
->p
, table
);
536 /* If area is L1L2, we work with merge table and therefore must
537 * delete node from level tables as well before deleting route info.
538 * FIXME: Is it performance problem? There has to be the better way.
539 * Like not to deal with it here at all (see the next comment)? */
540 if (rnode
->p
.family
== AF_INET
)
542 drnode
= route_node_get (area
->route_table
[0], &rnode
->p
);
543 if (drnode
->info
== rnode
->info
)
545 drnode
= route_node_get (area
->route_table
[1], &rnode
->p
);
546 if (drnode
->info
== rnode
->info
)
551 if (rnode
->p
.family
== AF_INET6
)
553 drnode
= route_node_get (area
->route_table6
[0], &rnode
->p
);
554 if (drnode
->info
== rnode
->info
)
556 drnode
= route_node_get (area
->route_table6
[1], &rnode
->p
);
557 if (drnode
->info
== rnode
->info
)
562 isis_route_delete (&rnode
->p
, table
);
567 /* Function to validate route tables for L1L2 areas. In this case we can't use
568 * level route tables directly, we have to merge them at first. L1 routes are
569 * preferred over the L2 ones.
571 * Merge algorithm is trivial (at least for now). All L1 paths are copied into
572 * merge table at first, then L2 paths are added if L1 path for same prefix
573 * doesn't already exists there.
575 * FIXME: Is it right place to do it at all? Maybe we should push both levels
576 * to the RIB with different zebra route types and let RIB handle this? */
578 isis_route_validate_merge (struct isis_area
*area
, int family
)
580 struct route_table
*table
= NULL
;
581 struct route_table
*merge
;
582 struct route_node
*rnode
, *mrnode
;
584 merge
= route_table_init ();
586 if (family
== AF_INET
)
587 table
= area
->route_table
[0];
589 else if (family
== AF_INET6
)
590 table
= area
->route_table6
[0];
593 for (rnode
= route_top (table
); rnode
; rnode
= route_next (rnode
))
595 if (rnode
->info
== NULL
)
597 mrnode
= route_node_get (merge
, &rnode
->p
);
598 mrnode
->info
= rnode
->info
;
601 if (family
== AF_INET
)
602 table
= area
->route_table
[1];
604 else if (family
== AF_INET6
)
605 table
= area
->route_table6
[1];
608 for (rnode
= route_top (table
); rnode
; rnode
= route_next (rnode
))
610 if (rnode
->info
== NULL
)
612 mrnode
= route_node_get (merge
, &rnode
->p
);
613 if (mrnode
->info
!= NULL
)
615 mrnode
->info
= rnode
->info
;
618 isis_route_validate_table (area
, merge
);
619 route_table_finish (merge
);
622 /* Walk through route tables and propagate necessary changes into RIB. In case
623 * of L1L2 area, level tables have to be merged at first. */
625 isis_route_validate (struct isis_area
*area
)
627 struct listnode
*node
;
628 struct isis_circuit
*circuit
;
630 if (area
->is_type
== IS_LEVEL_1
)
631 isis_route_validate_table (area
, area
->route_table
[0]);
632 else if (area
->is_type
== IS_LEVEL_2
)
633 isis_route_validate_table (area
, area
->route_table
[1]);
635 isis_route_validate_merge (area
, AF_INET
);
638 if (area
->is_type
== IS_LEVEL_1
)
639 isis_route_validate_table (area
, area
->route_table6
[0]);
640 else if (area
->is_type
== IS_LEVEL_2
)
641 isis_route_validate_table (area
, area
->route_table6
[1]);
643 isis_route_validate_merge (area
, AF_INET6
);
646 /* walk all circuits and reset any spf specific flags */
647 for (ALL_LIST_ELEMENTS_RO (area
->circuit_list
, node
, circuit
))
648 UNSET_FLAG(circuit
->flags
, ISIS_CIRCUIT_FLAPPED_AFTER_SPF
);
654 isis_route_invalidate_table (struct isis_area
*area
, struct route_table
*table
)
656 struct route_node
*rode
;
657 struct isis_route_info
*rinfo
;
658 for (rode
= route_top (table
); rode
; rode
= route_next (rode
))
660 if (rode
->info
== NULL
)
664 UNSET_FLAG (rinfo
->flag
, ISIS_ROUTE_FLAG_ACTIVE
);
669 isis_route_invalidate (struct isis_area
*area
)
671 if (area
->is_type
& IS_LEVEL_1
)
672 isis_route_invalidate_table (area
, area
->route_table
[0]);
673 if (area
->is_type
& IS_LEVEL_2
)
674 isis_route_invalidate_table (area
, area
->route_table
[1]);