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// SPDX-License-Identifier: GPL-2.0-or-later
/* BGP advertisement and adjacency
* Copyright (C) 1996, 97, 98, 99, 2000 Kunihiro Ishiguro
*/
#include <zebra.h>
#include "command.h"
#include "memory.h"
#include "prefix.h"
#include "hash.h"
#include "frrevent.h"
#include "queue.h"
#include "filter.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_table.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_advertise.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_aspath.h"
#include "bgpd/bgp_packet.h"
#include "bgpd/bgp_fsm.h"
#include "bgpd/bgp_mplsvpn.h"
#include "bgpd/bgp_updgrp.h"
/* BGP advertise attribute is used for pack same attribute update into
one packet. To do that we maintain attribute hash in struct
peer. */
struct bgp_advertise_attr *bgp_advertise_attr_new(void)
{
return XCALLOC(MTYPE_BGP_ADVERTISE_ATTR,
sizeof(struct bgp_advertise_attr));
}
void bgp_advertise_attr_free(struct bgp_advertise_attr *baa)
{
bgp_advertise_attr_fifo_fini(&baa->fifo);
XFREE(MTYPE_BGP_ADVERTISE_ATTR, baa);
}
static void *bgp_advertise_attr_hash_alloc(void *p)
{
struct bgp_advertise_attr *ref = (struct bgp_advertise_attr *)p;
struct bgp_advertise_attr *baa;
baa = bgp_advertise_attr_new();
baa->attr = ref->attr;
bgp_advertise_attr_fifo_init(&baa->fifo);
return baa;
}
unsigned int bgp_advertise_attr_hash_key(const void *p)
{
const struct bgp_advertise_attr *baa = p;
return attrhash_key_make(baa->attr);
}
bool bgp_advertise_attr_hash_cmp(const void *p1, const void *p2)
{
const struct bgp_advertise_attr *baa1 = p1;
const struct bgp_advertise_attr *baa2 = p2;
return attrhash_cmp(baa1->attr, baa2->attr);
}
/* BGP update and withdraw information is stored in BGP advertise
structure. This structure is referred from BGP adjacency
information. */
struct bgp_advertise *bgp_advertise_new(void)
{
return XCALLOC(MTYPE_BGP_ADVERTISE, sizeof(struct bgp_advertise));
}
void bgp_advertise_free(struct bgp_advertise *adv)
{
if (adv->pathi)
/* bgp_advertise bgp_path_info reference */
bgp_path_info_unlock(adv->pathi);
XFREE(MTYPE_BGP_ADVERTISE, adv);
}
void bgp_advertise_add(struct bgp_advertise_attr *baa,
struct bgp_advertise *adv)
{
bgp_advertise_attr_fifo_add_tail(&baa->fifo, adv);
}
void bgp_advertise_delete(struct bgp_advertise_attr *baa,
struct bgp_advertise *adv)
{
bgp_advertise_attr_fifo_del(&baa->fifo, adv);
}
struct bgp_advertise_attr *bgp_advertise_attr_intern(struct hash *hash,
struct attr *attr)
{
struct bgp_advertise_attr ref;
struct bgp_advertise_attr *baa;
ref.attr = bgp_attr_intern(attr);
baa = (struct bgp_advertise_attr *)hash_get(
hash, &ref, bgp_advertise_attr_hash_alloc);
baa->refcnt++;
return baa;
}
void bgp_advertise_attr_unintern(struct hash *hash,
struct bgp_advertise_attr *baa)
{
if (baa->refcnt)
baa->refcnt--;
if (baa->refcnt && baa->attr)
bgp_attr_unintern(&baa->attr);
else {
if (baa->attr) {
hash_release(hash, baa);
bgp_attr_unintern(&baa->attr);
}
bgp_advertise_attr_free(baa);
}
}
bool bgp_adj_out_lookup(struct peer *peer, struct bgp_dest *dest,
uint32_t addpath_tx_id)
{
struct bgp_adj_out *adj;
struct peer_af *paf;
afi_t afi;
safi_t safi;
bool addpath_capable;
RB_FOREACH (adj, bgp_adj_out_rb, &dest->adj_out)
SUBGRP_FOREACH_PEER (adj->subgroup, paf)
if (paf->peer == peer) {
afi = SUBGRP_AFI(adj->subgroup);
safi = SUBGRP_SAFI(adj->subgroup);
addpath_capable =
bgp_addpath_encode_tx(peer, afi, safi);
/* Match on a specific addpath_tx_id if we are
* using addpath for
* this
* peer and if an addpath_tx_id was specified */
if (addpath_capable && addpath_tx_id
&& adj->addpath_tx_id != addpath_tx_id)
continue;
return (adj->adv
? (adj->adv->baa ? true : false)
: (adj->attr ? true : false));
}
return false;
}
void bgp_adj_in_set(struct bgp_dest *dest, struct peer *peer, struct attr *attr,
uint32_t addpath_id, struct bgp_labels *labels)
{
struct bgp_adj_in *adj;
for (adj = dest->adj_in; adj; adj = adj->next) {
if (adj->peer == peer && adj->addpath_rx_id == addpath_id) {
if (!attrhash_cmp(adj->attr, attr)) {
bgp_attr_unintern(&adj->attr);
adj->attr = bgp_attr_intern(attr);
}
if (!bgp_labels_cmp(adj->labels, labels)) {
bgp_labels_unintern(&adj->labels);
adj->labels = bgp_labels_intern(labels);
}
return;
}
}
adj = XCALLOC(MTYPE_BGP_ADJ_IN, sizeof(struct bgp_adj_in));
adj->peer = peer_lock(peer); /* adj_in peer reference */
adj->attr = bgp_attr_intern(attr);
adj->uptime = monotime(NULL);
adj->addpath_rx_id = addpath_id;
adj->labels = bgp_labels_intern(labels);
BGP_ADJ_IN_ADD(dest, adj);
peer->stat_pfx_adj_rib_in++;
bgp_dest_lock_node(dest);
}
void bgp_adj_in_remove(struct bgp_dest **dest, struct bgp_adj_in *bai)
{
bgp_attr_unintern(&bai->attr);
bgp_labels_unintern(&bai->labels);
if (bai->peer)
bai->peer->stat_pfx_adj_rib_in--;
BGP_ADJ_IN_DEL(*dest, bai);
*dest = bgp_dest_unlock_node(*dest);
peer_unlock(bai->peer); /* adj_in peer reference */
XFREE(MTYPE_BGP_ADJ_IN, bai);
}
bool bgp_adj_in_unset(struct bgp_dest **dest, struct peer *peer,
uint32_t addpath_id)
{
struct bgp_adj_in *adj;
struct bgp_adj_in *adj_next;
adj = (*dest)->adj_in;
if (!adj)
return false;
while (adj) {
adj_next = adj->next;
if (adj->peer == peer && adj->addpath_rx_id == addpath_id)
bgp_adj_in_remove(dest, adj);
adj = adj_next;
assert(*dest);
}
return true;
}
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