ospf_asbr.c
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上传日期:2009-11-15
资源大小:1338k
文件大小:7k
- /*
- * OSPF AS Boundary Router functions.
- * Copyright (C) 1999, 2000 Kunihiro Ishiguro, Toshiaki Takada
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GNU Zebra; see the file COPYING. If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- */
- #include <zebra.h>
- #include "thread.h"
- #include "memory.h"
- #include "linklist.h"
- #include "prefix.h"
- #include "if.h"
- #include "table.h"
- #include "vty.h"
- #include "filter.h"
- #include "log.h"
- #include "ospfd/ospfd.h"
- #include "ospfd/ospf_interface.h"
- #include "ospfd/ospf_asbr.h"
- #include "ospfd/ospf_lsa.h"
- #include "ospfd/ospf_lsdb.h"
- #include "ospfd/ospf_neighbor.h"
- #include "ospfd/ospf_spf.h"
- #include "ospfd/ospf_flood.h"
- #include "ospfd/ospf_route.h"
- #include "ospfd/ospf_zebra.h"
- #include "ospfd/ospf_dump.h"
- /* Remove external route. */
- void
- ospf_external_route_remove (struct ospf *ospf, struct prefix_ipv4 *p)
- {
- struct route_node *rn;
- struct ospf_route *or;
- rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p);
- if (rn)
- if ((or = rn->info))
- {
- zlog_info ("Route[%s/%d]: external path deleted",
- inet_ntoa (p->prefix), p->prefixlen);
- /* Remove route from zebra. */
- if (or->type == OSPF_DESTINATION_NETWORK)
- ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or);
- ospf_route_free (or);
- rn->info = NULL;
- route_unlock_node (rn);
- route_unlock_node (rn);
- return;
- }
- zlog_info ("Route[%s/%d]: no such external path",
- inet_ntoa (p->prefix), p->prefixlen);
- }
- /* Lookup external route. */
- struct ospf_route *
- ospf_external_route_lookup (struct ospf *ospf,
- struct prefix_ipv4 *p)
- {
- struct route_node *rn;
- rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p);
- if (rn)
- {
- route_unlock_node (rn);
- if (rn->info)
- return rn->info;
- }
- zlog_warn ("Route[%s/%d]: lookup, no such prefix",
- inet_ntoa (p->prefix), p->prefixlen);
- return NULL;
- }
- /* Add an External info for AS-external-LSA. */
- struct external_info *
- ospf_external_info_new (u_char type)
- {
- struct external_info *new;
- new = (struct external_info *)
- XMALLOC (MTYPE_OSPF_EXTERNAL_INFO, sizeof (struct external_info));
- memset (new, 0, sizeof (struct external_info));
- new->type = type;
- ospf_reset_route_map_set_values (&new->route_map_set);
- return new;
- }
- void
- ospf_external_info_free (struct external_info *ei)
- {
- XFREE (MTYPE_OSPF_EXTERNAL_INFO, ei);
- }
- void
- ospf_reset_route_map_set_values (struct route_map_set_values *values)
- {
- values->metric = -1;
- values->metric_type = -1;
- }
- int
- ospf_route_map_set_compare (struct route_map_set_values *values1,
- struct route_map_set_values *values2)
- {
- return values1->metric == values2->metric &&
- values1->metric_type == values2->metric_type;
- }
- /* Add an External info for AS-external-LSA. */
- struct external_info *
- ospf_external_info_add (u_char type, struct prefix_ipv4 p,
- unsigned int ifindex, struct in_addr nexthop)
- {
- struct external_info *new;
- struct route_node *rn;
- /* Initialize route table. */
- if (EXTERNAL_INFO (type) == NULL)
- EXTERNAL_INFO (type) = route_table_init ();
- rn = route_node_get (EXTERNAL_INFO (type), (struct prefix *) &p);
- /* If old info exists, -- discard new one or overwrite with new one? */
- if (rn)
- if (rn->info)
- {
- route_unlock_node (rn);
- zlog_warn ("Redistribute[%s]: %s/%d already exists, discard.",
- LOOKUP (ospf_redistributed_proto, type),
- inet_ntoa (p.prefix), p.prefixlen);
- /* XFREE (MTYPE_OSPF_TMP, rn->info); */
- return rn->info;
- }
- /* Create new External info instance. */
- new = ospf_external_info_new (type);
- new->p = p;
- new->ifindex = ifindex;
- new->nexthop = nexthop;
- new->tag = 0;
- rn->info = new;
- if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
- zlog_info ("Redistribute[%s]: %s/%d external info created.",
- LOOKUP (ospf_redistributed_proto, type),
- inet_ntoa (p.prefix), p.prefixlen);
- return new;
- }
- void
- ospf_external_info_delete (u_char type, struct prefix_ipv4 p)
- {
- struct route_node *rn;
- rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) &p);
- if (rn)
- {
- ospf_external_info_free (rn->info);
- rn->info = NULL;
- route_unlock_node (rn);
- route_unlock_node (rn);
- }
- }
- struct external_info *
- ospf_external_info_lookup (u_char type, struct prefix_ipv4 *p)
- {
- struct route_node *rn;
- rn = route_node_lookup (EXTERNAL_INFO (type), (struct prefix *) p);
- if (rn)
- {
- route_unlock_node (rn);
- if (rn->info)
- return rn->info;
- }
- return NULL;
- }
- struct ospf_lsa *
- ospf_external_info_find_lsa (struct ospf *ospf,
- struct prefix_ipv4 *p)
- {
- struct ospf_lsa *lsa;
- struct as_external_lsa *al;
- struct in_addr mask, id;
- lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
- p->prefix, ospf->router_id);
- if (!lsa)
- return NULL;
- al = (struct as_external_lsa *) lsa->data;
- masklen2ip (p->prefixlen, &mask);
- if (mask.s_addr != al->mask.s_addr)
- {
- id.s_addr = p->prefix.s_addr | (~mask.s_addr);
- lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA,
- id, ospf->router_id);
- if (!lsa)
- return NULL;
- }
- return lsa;
- }
- /* Update ASBR status. */
- void
- ospf_asbr_status_update (struct ospf *ospf, u_char status)
- {
- zlog_info ("ASBR[Status:%d]: Update", status);
- /* ASBR on. */
- if (status)
- {
- /* Already ASBR. */
- if (IS_OSPF_ASBR (ospf))
- {
- zlog_info ("ASBR[Status:%d]: Already ASBR", status);
- return;
- }
- SET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
- }
- else
- {
- /* Already non ASBR. */
- if (! IS_OSPF_ASBR (ospf))
- {
- zlog_info ("ASBR[Status:%d]: Already non ASBR", status);
- return;
- }
- UNSET_FLAG (ospf->flags, OSPF_FLAG_ASBR);
- }
- /* Transition from/to status ASBR, schedule timer. */
- ospf_spf_calculate_schedule (ospf);
- OSPF_TIMER_ON (ospf->t_router_lsa_update,
- ospf_router_lsa_update_timer, OSPF_LSA_UPDATE_DELAY);
- }
- void
- ospf_redistribute_withdraw (u_char type)
- {
- struct ospf *ospf;
- struct route_node *rn;
- struct external_info *ei;
- ospf = ospf_lookup ();
- /* Delete external info for specified type. */
- if (EXTERNAL_INFO (type))
- for (rn = route_top (EXTERNAL_INFO (type)); rn; rn = route_next (rn))
- if ((ei = rn->info))
- if (ospf_external_info_find_lsa (ospf, &ei->p))
- {
- if (is_prefix_default (&ei->p) &&
- ospf->default_originate != DEFAULT_ORIGINATE_NONE)
- continue;
- ospf_external_lsa_flush (ospf, type, &ei->p, ei->ifindex, ei->nexthop);
- ospf_external_info_delete (type, ei->p);
- }
- }