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/*
* 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, u_short instance)
{
struct external_info *new;
new = (struct external_info *)
XCALLOC (MTYPE_OSPF_EXTERNAL_INFO, sizeof (struct external_info));
new->type = type;
new->instance = instance;
ospf_reset_route_map_set_values (&new->route_map_set);
return new;
}
static 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, u_short instance, struct prefix_ipv4 p,
ifindex_t ifindex, struct in_addr nexthop,
u_short tag)
{
struct external_info *new;
struct route_node *rn;
struct ospf_external *ext;
char inetbuf[INET6_BUFSIZ];
ext = ospf_external_lookup(type, instance);
if (!ext)
ext = ospf_external_add(type, instance);
rn = route_node_get (EXTERNAL_INFO (ext), (struct prefix *) &p);
/* If old info exists, -- discard new one or overwrite with new one? */
if (rn)
if (rn->info)
{
new = rn->info;
if ((new->ifindex == ifindex) &&
(new->nexthop.s_addr == nexthop.s_addr) && (new->tag == tag))
{
route_unlock_node(rn);
return NULL; /* NULL => no LSA to refresh */
}
inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf, INET6_BUFSIZ);
zlog_warn ("Redistribute[%s][%d]: %s/%d discarding old info with NH %s.",
ospf_redist_string(type), instance,
inet_ntoa (p.prefix), p.prefixlen, inetbuf);
XFREE (MTYPE_OSPF_EXTERNAL_INFO, rn->info);
rn->info = NULL;
}
/* Create new External info instance. */
new = ospf_external_info_new (type, instance);
new->p = p;
new->ifindex = ifindex;
new->nexthop = nexthop;
new->tag = tag;
/* we don't unlock rn from the get() because we're attaching the info */
if (rn)
rn->info = new;
if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
{
inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf, INET6_BUFSIZ);
zlog_debug ("Redistribute[%s]: %s/%d external info created, with NH %s",
ospf_redist_string(type),
inet_ntoa (p.prefix), p.prefixlen, inetbuf);
}
return new;
}
void
ospf_external_info_delete (u_char type, u_short instance, struct prefix_ipv4 p)
{
struct route_node *rn;
struct ospf_external *ext;
ext = ospf_external_lookup(type, instance);
if (!ext)
return;
rn = route_node_lookup (EXTERNAL_INFO (ext), (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, u_short instance, struct prefix_ipv4 *p)
{
struct route_node *rn;
struct ospf_external *ext;
ext = ospf_external_lookup(type, instance);
if (!ext)
return NULL;
rn = route_node_lookup (EXTERNAL_INFO (ext), (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, SPF_FLAG_ASBR_STATUS_CHANGE);
ospf_router_lsa_update (ospf);
}
void
ospf_redistribute_withdraw (struct ospf *ospf, u_char type, u_short instance)
{
struct route_node *rn;
struct external_info *ei;
struct ospf_external *ext;
ext = ospf_external_lookup(type, instance);
if (!ext)
return;
/* Delete external info for specified type. */
if (EXTERNAL_INFO (ext))
for (rn = route_top (EXTERNAL_INFO (ext)); 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_free (ei);
route_unlock_node (rn);
rn->info = NULL;
}
}
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