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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OSPF LSDB support.
* Copyright (C) 1999, 2000 Alex Zinin, Kunihiro Ishiguro, Toshiaki Takada
*/
#include <zebra.h>
#include "prefix.h"
#include "table.h"
#include "memory.h"
#include "log.h"
#include "ospfd/ospfd.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
struct ospf_lsdb *ospf_lsdb_new(void)
{
struct ospf_lsdb *new;
new = XCALLOC(MTYPE_OSPF_LSDB, sizeof(struct ospf_lsdb));
ospf_lsdb_init(new);
return new;
}
void ospf_lsdb_init(struct ospf_lsdb *lsdb)
{
int i;
for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++)
lsdb->type[i].db = route_table_init();
}
void ospf_lsdb_free(struct ospf_lsdb *lsdb)
{
ospf_lsdb_cleanup(lsdb);
XFREE(MTYPE_OSPF_LSDB, lsdb);
}
void ospf_lsdb_cleanup(struct ospf_lsdb *lsdb)
{
int i;
assert(lsdb);
assert(lsdb->total == 0);
ospf_lsdb_delete_all(lsdb);
for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++)
route_table_finish(lsdb->type[i].db);
}
void ls_prefix_set(struct prefix_ls *lp, struct ospf_lsa *lsa)
{
if (lp && lsa && lsa->data) {
lp->family = AF_UNSPEC;
lp->prefixlen = 64;
lp->id = lsa->data->id;
lp->adv_router = lsa->data->adv_router;
}
}
static void ospf_lsdb_delete_entry(struct ospf_lsdb *lsdb,
struct route_node *rn)
{
struct ospf_lsa *lsa = rn->info;
if (!lsa)
return;
assert(rn->table == lsdb->type[lsa->data->type].db);
if (IS_LSA_SELF(lsa))
lsdb->type[lsa->data->type].count_self--;
lsdb->type[lsa->data->type].count--;
lsdb->type[lsa->data->type].checksum -= ntohs(lsa->data->checksum);
lsdb->total--;
/* Decrement number of router LSAs received with DC bit set */
if (lsa->area && (lsa->area->lsdb == lsdb) && !IS_LSA_SELF(lsa) &&
(lsa->data->type == OSPF_ROUTER_LSA) &&
CHECK_FLAG(lsa->data->options, OSPF_OPTION_DC))
lsa->area->fr_info.router_lsas_recv_dc_bit--;
/*
* If the LSA being deleted is indication LSA, then set the
* pointer to NULL.
*/
if (lsa->area && lsa->area->fr_info.indication_lsa_self &&
(lsa->area->fr_info.indication_lsa_self == lsa))
lsa->area->fr_info.indication_lsa_self = NULL;
rn->info = NULL;
route_unlock_node(rn);
#ifdef MONITOR_LSDB_CHANGE
if (lsdb->del_lsa_hook != NULL)
(*lsdb->del_lsa_hook)(lsa);
#endif /* MONITOR_LSDB_CHANGE */
ospf_lsa_unlock(&lsa); /* lsdb */
return;
}
/* Add new LSA to lsdb. */
void ospf_lsdb_add(struct ospf_lsdb *lsdb, struct ospf_lsa *lsa)
{
struct route_table *table;
struct prefix_ls lp;
struct route_node *rn;
table = lsdb->type[lsa->data->type].db;
ls_prefix_set(&lp, lsa);
rn = route_node_get(table, (struct prefix *)&lp);
/* nothing to do? */
if (rn->info && rn->info == lsa) {
route_unlock_node(rn);
return;
}
/* purge old entry? */
if (rn->info)
ospf_lsdb_delete_entry(lsdb, rn);
if (IS_LSA_SELF(lsa))
lsdb->type[lsa->data->type].count_self++;
lsdb->type[lsa->data->type].count++;
lsdb->total++;
/* Increment number of router LSAs received with DC bit set */
if (lsa->area && (lsa->area->lsdb == lsdb) && !IS_LSA_SELF(lsa) &&
(lsa->data->type == OSPF_ROUTER_LSA) &&
CHECK_FLAG(lsa->data->options, OSPF_OPTION_DC))
lsa->area->fr_info.router_lsas_recv_dc_bit++;
#ifdef MONITOR_LSDB_CHANGE
if (lsdb->new_lsa_hook != NULL)
(*lsdb->new_lsa_hook)(lsa);
#endif /* MONITOR_LSDB_CHANGE */
lsdb->type[lsa->data->type].checksum += ntohs(lsa->data->checksum);
rn->info = ospf_lsa_lock(lsa); /* lsdb */
}
void ospf_lsdb_delete(struct ospf_lsdb *lsdb, struct ospf_lsa *lsa)
{
struct route_table *table;
struct prefix_ls lp;
struct route_node *rn;
if (!lsdb || !lsa)
return;
assert(lsa->data->type < OSPF_MAX_LSA);
table = lsdb->type[lsa->data->type].db;
ls_prefix_set(&lp, lsa);
if ((rn = route_node_lookup(table, (struct prefix *)&lp))) {
if (rn->info == lsa)
ospf_lsdb_delete_entry(lsdb, rn);
route_unlock_node(rn); /* route_node_lookup */
}
}
void ospf_lsdb_delete_all(struct ospf_lsdb *lsdb)
{
struct route_table *table;
struct route_node *rn;
int i;
for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) {
table = lsdb->type[i].db;
for (rn = route_top(table); rn; rn = route_next(rn))
if (rn->info != NULL)
ospf_lsdb_delete_entry(lsdb, rn);
}
}
struct ospf_lsa *ospf_lsdb_lookup(struct ospf_lsdb *lsdb, struct ospf_lsa *lsa)
{
struct route_table *table;
struct prefix_ls lp;
struct route_node *rn;
struct ospf_lsa *find;
table = lsdb->type[lsa->data->type].db;
ls_prefix_set(&lp, lsa);
rn = route_node_lookup(table, (struct prefix *)&lp);
if (rn) {
find = rn->info;
route_unlock_node(rn);
return find;
}
return NULL;
}
struct ospf_lsa *ospf_lsdb_lookup_by_id(struct ospf_lsdb *lsdb, uint8_t type,
struct in_addr id,
struct in_addr adv_router)
{
struct route_table *table;
struct prefix_ls lp;
struct route_node *rn;
struct ospf_lsa *find;
table = lsdb->type[type].db;
memset(&lp, 0, sizeof(lp));
lp.family = AF_UNSPEC;
lp.prefixlen = 64;
lp.id = id;
lp.adv_router = adv_router;
rn = route_node_lookup(table, (struct prefix *)&lp);
if (rn) {
find = rn->info;
route_unlock_node(rn);
return find;
}
return NULL;
}
struct ospf_lsa *ospf_lsdb_lookup_by_id_next(struct ospf_lsdb *lsdb,
uint8_t type, struct in_addr id,
struct in_addr adv_router,
int first)
{
struct route_table *table;
struct prefix_ls lp;
struct route_node *rn;
struct ospf_lsa *find;
table = lsdb->type[type].db;
memset(&lp, 0, sizeof(lp));
lp.family = AF_UNSPEC;
lp.prefixlen = 64;
lp.id = id;
lp.adv_router = adv_router;
if (first)
rn = route_top(table);
else {
if ((rn = route_node_lookup(table, (struct prefix *)&lp))
== NULL)
return NULL;
rn = route_next(rn);
}
for (; rn; rn = route_next(rn))
if (rn->info)
break;
if (rn && rn->info) {
find = rn->info;
route_unlock_node(rn);
return find;
}
return NULL;
}
unsigned long ospf_lsdb_count_all(struct ospf_lsdb *lsdb)
{
return lsdb->total;
}
unsigned long ospf_lsdb_count(struct ospf_lsdb *lsdb, int type)
{
return lsdb->type[type].count;
}
unsigned long ospf_lsdb_count_self(struct ospf_lsdb *lsdb, int type)
{
return lsdb->type[type].count_self;
}
unsigned int ospf_lsdb_checksum(struct ospf_lsdb *lsdb, int type)
{
return lsdb->type[type].checksum;
}
unsigned long ospf_lsdb_isempty(struct ospf_lsdb *lsdb)
{
return (lsdb->total == 0);
}
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