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/* BGP routing table
* Copyright (C) 1998, 2001 Kunihiro Ishiguro
*
* 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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "prefix.h"
#include "memory.h"
#include "sockunion.h"
#include "queue.h"
#include "filter.h"
#include "command.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_table.h"
#include "bgp_addpath.h"
void bgp_table_lock(struct bgp_table *rt)
{
rt->lock++;
}
void bgp_table_unlock(struct bgp_table *rt)
{
assert(rt->lock > 0);
rt->lock--;
if (rt->lock != 0) {
return;
}
route_table_finish(rt->route_table);
rt->route_table = NULL;
XFREE(MTYPE_BGP_TABLE, rt);
}
void bgp_table_finish(struct bgp_table **rt)
{
if (*rt != NULL) {
bgp_table_unlock(*rt);
*rt = NULL;
}
}
/*
* bgp_node_create
*/
static struct route_node *bgp_node_create(route_table_delegate_t *delegate,
struct route_table *table)
{
struct bgp_node *node;
node = XCALLOC(MTYPE_BGP_NODE, sizeof(struct bgp_node));
RB_INIT(bgp_adj_out_rb, &node->adj_out);
return bgp_node_to_rnode(node);
}
/*
* bgp_node_destroy
*/
static void bgp_node_destroy(route_table_delegate_t *delegate,
struct route_table *table, struct route_node *node)
{
struct bgp_node *bgp_node;
struct bgp_table *rt;
bgp_node = bgp_node_from_rnode(node);
rt = table->info;
if (rt->bgp) {
bgp_addpath_free_node_data(&rt->bgp->tx_addpath,
&bgp_node->tx_addpath,
rt->afi, rt->safi);
}
XFREE(MTYPE_BGP_NODE, bgp_node);
}
/*
* Function vector to customize the behavior of the route table
* library for BGP route tables.
*/
route_table_delegate_t bgp_table_delegate = {.create_node = bgp_node_create,
.destroy_node = bgp_node_destroy};
/*
* bgp_table_init
*/
struct bgp_table *bgp_table_init(struct bgp *bgp, afi_t afi, safi_t safi)
{
struct bgp_table *rt;
rt = XCALLOC(MTYPE_BGP_TABLE, sizeof(struct bgp_table));
rt->route_table = route_table_init_with_delegate(&bgp_table_delegate);
/*
* Set up back pointer to bgp_table.
*/
route_table_set_info(rt->route_table, rt);
/*
* pointer to bgp instance allows working back from bgp_path_info to bgp
*/
rt->bgp = bgp;
bgp_table_lock(rt);
rt->afi = afi;
rt->safi = safi;
return rt;
}
static struct bgp_node *
bgp_route_next_until_maxlen(struct bgp_node *node, const struct bgp_node *limit,
const uint8_t maxlen)
{
if (node->l_left && node->p.prefixlen < maxlen
&& node->l_left->p.prefixlen <= maxlen) {
return bgp_node_from_rnode(node->l_left);
}
if (node->l_right && node->p.prefixlen < maxlen
&& node->l_right->p.prefixlen <= maxlen) {
return bgp_node_from_rnode(node->l_right);
}
while (node->parent && node != limit) {
if (bgp_node_from_rnode(node->parent->l_left) == node
&& node->parent->l_right) {
return bgp_node_from_rnode(node->parent->l_right);
}
node = bgp_node_from_rnode(node->parent);
}
return NULL;
}
void bgp_table_range_lookup(const struct bgp_table *table, struct prefix *p,
uint8_t maxlen, struct list *matches)
{
struct bgp_node *node = bgp_node_from_rnode(table->route_table->top);
struct bgp_node *matched = NULL;
while (node && node->p.prefixlen <= p->prefixlen
&& prefix_match(&node->p, p)) {
if (bgp_node_has_bgp_path_info_data(node)
&& node->p.prefixlen == p->prefixlen) {
matched = node;
break;
}
node = bgp_node_from_rnode(node->link[prefix_bit(
&p->u.prefix, node->p.prefixlen)]);
}
if (node == NULL)
return;
if ((matched == NULL && node->p.prefixlen > maxlen) || !node->parent)
return;
else if (matched == NULL)
matched = node = bgp_node_from_rnode(node->parent);
if (bgp_node_has_bgp_path_info_data(matched)) {
bgp_lock_node(matched);
listnode_add(matches, matched);
}
while ((node = bgp_route_next_until_maxlen(node, matched, maxlen))) {
if (prefix_match(p, &node->p)) {
if (bgp_node_has_bgp_path_info_data(node)) {
bgp_lock_node(node);
listnode_add(matches, node);
}
}
}
}
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