forked from FRRouting/frr
/
bgpd.c
7900 lines (6658 loc) · 214 KB
/
bgpd.c
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/* BGP-4, BGP-4+ daemon program
* Copyright (C) 1996, 97, 98, 99, 2000 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 "thread.h"
#include "buffer.h"
#include "stream.h"
#include "ringbuf.h"
#include "command.h"
#include "sockunion.h"
#include "sockopt.h"
#include "network.h"
#include "memory.h"
#include "filter.h"
#include "routemap.h"
#include "log.h"
#include "plist.h"
#include "linklist.h"
#include "workqueue.h"
#include "queue.h"
#include "zclient.h"
#include "bfd.h"
#include "hash.h"
#include "jhash.h"
#include "table.h"
#include "lib/json.h"
#include "frr_pthread.h"
#include "bitfield.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_table.h"
#include "bgpd/bgp_aspath.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_dump.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_errors.h"
#include "bgpd/bgp_community.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_regex.h"
#include "bgpd/bgp_clist.h"
#include "bgpd/bgp_fsm.h"
#include "bgpd/bgp_packet.h"
#include "bgpd/bgp_zebra.h"
#include "bgpd/bgp_open.h"
#include "bgpd/bgp_filter.h"
#include "bgpd/bgp_nexthop.h"
#include "bgpd/bgp_damp.h"
#include "bgpd/bgp_mplsvpn.h"
#if ENABLE_BGP_VNC
#include "bgpd/rfapi/bgp_rfapi_cfg.h"
#include "bgpd/rfapi/rfapi_backend.h"
#endif
#include "bgpd/bgp_evpn.h"
#include "bgpd/bgp_advertise.h"
#include "bgpd/bgp_network.h"
#include "bgpd/bgp_vty.h"
#include "bgpd/bgp_mpath.h"
#include "bgpd/bgp_nht.h"
#include "bgpd/bgp_updgrp.h"
#include "bgpd/bgp_bfd.h"
#include "bgpd/bgp_memory.h"
#include "bgpd/bgp_evpn_vty.h"
#include "bgpd/bgp_keepalives.h"
#include "bgpd/bgp_io.h"
#include "bgpd/bgp_ecommunity.h"
#include "bgpd/bgp_flowspec.h"
#include "bgpd/bgp_labelpool.h"
#include "bgpd/bgp_pbr.h"
DEFINE_MTYPE_STATIC(BGPD, PEER_TX_SHUTDOWN_MSG, "Peer shutdown message (TX)");
DEFINE_QOBJ_TYPE(bgp_master)
DEFINE_QOBJ_TYPE(bgp)
DEFINE_QOBJ_TYPE(peer)
/* BGP process wide configuration. */
static struct bgp_master bgp_master;
/* BGP process wide configuration pointer to export. */
struct bgp_master *bm;
/* BGP community-list. */
struct community_list_handler *bgp_clist;
unsigned int multipath_num = MULTIPATH_NUM;
static void bgp_if_finish(struct bgp *bgp);
static void peer_drop_dynamic_neighbor(struct peer *peer);
extern struct zclient *zclient;
/* handle main socket creation or deletion */
static int bgp_check_main_socket(bool create, struct bgp *bgp)
{
static int bgp_server_main_created;
if (create == true) {
if (bgp_server_main_created)
return 0;
if (bgp_socket(bgp, bm->port, bm->address) < 0)
return BGP_ERR_INVALID_VALUE;
bgp_server_main_created = 1;
return 0;
}
if (!bgp_server_main_created)
return 0;
bgp_close();
bgp_server_main_created = 0;
return 0;
}
void bgp_session_reset(struct peer *peer)
{
if (peer->doppelganger && (peer->doppelganger->status != Deleted)
&& !(CHECK_FLAG(peer->doppelganger->flags, PEER_FLAG_CONFIG_NODE)))
peer_delete(peer->doppelganger);
BGP_EVENT_ADD(peer, BGP_Stop);
}
/*
* During session reset, we may delete the doppelganger peer, which would
* be the next node to the current node. If the session reset was invoked
* during walk of peer list, we would end up accessing the freed next
* node. This function moves the next node along.
*/
static void bgp_session_reset_safe(struct peer *peer, struct listnode **nnode)
{
struct listnode *n;
struct peer *npeer;
n = (nnode) ? *nnode : NULL;
npeer = (n) ? listgetdata(n) : NULL;
if (peer->doppelganger && (peer->doppelganger->status != Deleted)
&& !(CHECK_FLAG(peer->doppelganger->flags,
PEER_FLAG_CONFIG_NODE))) {
if (peer->doppelganger == npeer)
/* nnode and *nnode are confirmed to be non-NULL here */
*nnode = (*nnode)->next;
peer_delete(peer->doppelganger);
}
BGP_EVENT_ADD(peer, BGP_Stop);
}
/* BGP global flag manipulation. */
int bgp_option_set(int flag)
{
switch (flag) {
case BGP_OPT_NO_FIB:
case BGP_OPT_MULTIPLE_INSTANCE:
case BGP_OPT_CONFIG_CISCO:
case BGP_OPT_NO_LISTEN:
SET_FLAG(bm->options, flag);
break;
default:
return BGP_ERR_INVALID_FLAG;
}
return 0;
}
int bgp_option_unset(int flag)
{
switch (flag) {
case BGP_OPT_MULTIPLE_INSTANCE:
if (listcount(bm->bgp) > 1)
return BGP_ERR_MULTIPLE_INSTANCE_USED;
/* Fall through. */
case BGP_OPT_NO_FIB:
case BGP_OPT_CONFIG_CISCO:
UNSET_FLAG(bm->options, flag);
break;
default:
return BGP_ERR_INVALID_FLAG;
}
return 0;
}
int bgp_option_check(int flag)
{
return CHECK_FLAG(bm->options, flag);
}
/* BGP flag manipulation. */
int bgp_flag_set(struct bgp *bgp, int flag)
{
SET_FLAG(bgp->flags, flag);
return 0;
}
int bgp_flag_unset(struct bgp *bgp, int flag)
{
UNSET_FLAG(bgp->flags, flag);
return 0;
}
int bgp_flag_check(struct bgp *bgp, int flag)
{
return CHECK_FLAG(bgp->flags, flag);
}
/* Internal function to set BGP structure configureation flag. */
static void bgp_config_set(struct bgp *bgp, int config)
{
SET_FLAG(bgp->config, config);
}
static void bgp_config_unset(struct bgp *bgp, int config)
{
UNSET_FLAG(bgp->config, config);
}
static int bgp_config_check(struct bgp *bgp, int config)
{
return CHECK_FLAG(bgp->config, config);
}
/* Set BGP router identifier. */
static int bgp_router_id_set(struct bgp *bgp, const struct in_addr *id)
{
struct peer *peer;
struct listnode *node, *nnode;
if (IPV4_ADDR_SAME(&bgp->router_id, id))
return 0;
/* EVPN uses router id in RD, withdraw them */
if (is_evpn_enabled())
bgp_evpn_handle_router_id_update(bgp, TRUE);
IPV4_ADDR_COPY(&bgp->router_id, id);
/* Set all peer's local identifier with this value. */
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
IPV4_ADDR_COPY(&peer->local_id, id);
if (BGP_IS_VALID_STATE_FOR_NOTIF(peer->status)) {
peer->last_reset = PEER_DOWN_RID_CHANGE;
bgp_notify_send(peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_CEASE_CONFIG_CHANGE);
}
}
/* EVPN uses router id in RD, update them */
if (is_evpn_enabled())
bgp_evpn_handle_router_id_update(bgp, FALSE);
return 0;
}
void bgp_router_id_zebra_bump(vrf_id_t vrf_id, const struct prefix *router_id)
{
struct listnode *node, *nnode;
struct bgp *bgp;
if (vrf_id == VRF_DEFAULT) {
/* Router-id change for default VRF has to also update all
* views. */
for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp)) {
if (bgp->inst_type == BGP_INSTANCE_TYPE_VRF)
continue;
bgp->router_id_zebra = router_id->u.prefix4;
if (!bgp->router_id_static.s_addr)
bgp_router_id_set(bgp, &router_id->u.prefix4);
}
} else {
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (bgp) {
bgp->router_id_zebra = router_id->u.prefix4;
if (!bgp->router_id_static.s_addr)
bgp_router_id_set(bgp, &router_id->u.prefix4);
}
}
}
int bgp_router_id_static_set(struct bgp *bgp, struct in_addr id)
{
bgp->router_id_static = id;
bgp_router_id_set(bgp, id.s_addr ? &id : &bgp->router_id_zebra);
return 0;
}
/* BGP's cluster-id control. */
int bgp_cluster_id_set(struct bgp *bgp, struct in_addr *cluster_id)
{
struct peer *peer;
struct listnode *node, *nnode;
if (bgp_config_check(bgp, BGP_CONFIG_CLUSTER_ID)
&& IPV4_ADDR_SAME(&bgp->cluster_id, cluster_id))
return 0;
IPV4_ADDR_COPY(&bgp->cluster_id, cluster_id);
bgp_config_set(bgp, BGP_CONFIG_CLUSTER_ID);
/* Clear all IBGP peer. */
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
if (peer->sort != BGP_PEER_IBGP)
continue;
if (BGP_IS_VALID_STATE_FOR_NOTIF(peer->status)) {
peer->last_reset = PEER_DOWN_CLID_CHANGE;
bgp_notify_send(peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_CEASE_CONFIG_CHANGE);
}
}
return 0;
}
int bgp_cluster_id_unset(struct bgp *bgp)
{
struct peer *peer;
struct listnode *node, *nnode;
if (!bgp_config_check(bgp, BGP_CONFIG_CLUSTER_ID))
return 0;
bgp->cluster_id.s_addr = 0;
bgp_config_unset(bgp, BGP_CONFIG_CLUSTER_ID);
/* Clear all IBGP peer. */
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
if (peer->sort != BGP_PEER_IBGP)
continue;
if (BGP_IS_VALID_STATE_FOR_NOTIF(peer->status)) {
peer->last_reset = PEER_DOWN_CLID_CHANGE;
bgp_notify_send(peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_CEASE_CONFIG_CHANGE);
}
}
return 0;
}
/* time_t value that is monotonicly increasing
* and uneffected by adjustments to system clock
*/
time_t bgp_clock(void)
{
struct timeval tv;
monotime(&tv);
return tv.tv_sec;
}
/* BGP timer configuration. */
int bgp_timers_set(struct bgp *bgp, uint32_t keepalive, uint32_t holdtime)
{
bgp->default_keepalive =
(keepalive < holdtime / 3 ? keepalive : holdtime / 3);
bgp->default_holdtime = holdtime;
return 0;
}
int bgp_timers_unset(struct bgp *bgp)
{
bgp->default_keepalive = BGP_DEFAULT_KEEPALIVE;
bgp->default_holdtime = BGP_DEFAULT_HOLDTIME;
return 0;
}
/* BGP confederation configuration. */
int bgp_confederation_id_set(struct bgp *bgp, as_t as)
{
struct peer *peer;
struct listnode *node, *nnode;
int already_confed;
if (as == 0)
return BGP_ERR_INVALID_AS;
/* Remember - were we doing confederation before? */
already_confed = bgp_config_check(bgp, BGP_CONFIG_CONFEDERATION);
bgp->confed_id = as;
bgp_config_set(bgp, BGP_CONFIG_CONFEDERATION);
/* If we were doing confederation already, this is just an external
AS change. Just Reset EBGP sessions, not CONFED sessions. If we
were not doing confederation before, reset all EBGP sessions. */
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
/* We're looking for peers who's AS is not local or part of our
confederation. */
if (already_confed) {
if (peer_sort(peer) == BGP_PEER_EBGP) {
peer->local_as = as;
if (BGP_IS_VALID_STATE_FOR_NOTIF(
peer->status)) {
peer->last_reset =
PEER_DOWN_CONFED_ID_CHANGE;
bgp_notify_send(
peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_CEASE_CONFIG_CHANGE);
} else
bgp_session_reset_safe(peer, &nnode);
}
} else {
/* Not doign confederation before, so reset every
non-local
session */
if (peer_sort(peer) != BGP_PEER_IBGP) {
/* Reset the local_as to be our EBGP one */
if (peer_sort(peer) == BGP_PEER_EBGP)
peer->local_as = as;
if (BGP_IS_VALID_STATE_FOR_NOTIF(
peer->status)) {
peer->last_reset =
PEER_DOWN_CONFED_ID_CHANGE;
bgp_notify_send(
peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_CEASE_CONFIG_CHANGE);
} else
bgp_session_reset_safe(peer, &nnode);
}
}
}
return 0;
}
int bgp_confederation_id_unset(struct bgp *bgp)
{
struct peer *peer;
struct listnode *node, *nnode;
bgp->confed_id = 0;
bgp_config_unset(bgp, BGP_CONFIG_CONFEDERATION);
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
/* We're looking for peers who's AS is not local */
if (peer_sort(peer) != BGP_PEER_IBGP) {
peer->local_as = bgp->as;
if (BGP_IS_VALID_STATE_FOR_NOTIF(peer->status)) {
peer->last_reset = PEER_DOWN_CONFED_ID_CHANGE;
bgp_notify_send(peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_CEASE_CONFIG_CHANGE);
}
else
bgp_session_reset_safe(peer, &nnode);
}
}
return 0;
}
/* Is an AS part of the confed or not? */
int bgp_confederation_peers_check(struct bgp *bgp, as_t as)
{
int i;
if (!bgp)
return 0;
for (i = 0; i < bgp->confed_peers_cnt; i++)
if (bgp->confed_peers[i] == as)
return 1;
return 0;
}
/* Add an AS to the confederation set. */
int bgp_confederation_peers_add(struct bgp *bgp, as_t as)
{
struct peer *peer;
struct listnode *node, *nnode;
if (!bgp)
return BGP_ERR_INVALID_BGP;
if (bgp->as == as)
return BGP_ERR_INVALID_AS;
if (bgp_confederation_peers_check(bgp, as))
return -1;
if (bgp->confed_peers)
bgp->confed_peers =
XREALLOC(MTYPE_BGP_CONFED_LIST, bgp->confed_peers,
(bgp->confed_peers_cnt + 1) * sizeof(as_t));
else
bgp->confed_peers =
XMALLOC(MTYPE_BGP_CONFED_LIST,
(bgp->confed_peers_cnt + 1) * sizeof(as_t));
bgp->confed_peers[bgp->confed_peers_cnt] = as;
bgp->confed_peers_cnt++;
if (bgp_config_check(bgp, BGP_CONFIG_CONFEDERATION)) {
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
if (peer->as == as) {
peer->local_as = bgp->as;
if (BGP_IS_VALID_STATE_FOR_NOTIF(
peer->status)) {
peer->last_reset =
PEER_DOWN_CONFED_PEER_CHANGE;
bgp_notify_send(
peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_CEASE_CONFIG_CHANGE);
} else
bgp_session_reset_safe(peer, &nnode);
}
}
}
return 0;
}
/* Delete an AS from the confederation set. */
int bgp_confederation_peers_remove(struct bgp *bgp, as_t as)
{
int i;
int j;
struct peer *peer;
struct listnode *node, *nnode;
if (!bgp)
return -1;
if (!bgp_confederation_peers_check(bgp, as))
return -1;
for (i = 0; i < bgp->confed_peers_cnt; i++)
if (bgp->confed_peers[i] == as)
for (j = i + 1; j < bgp->confed_peers_cnt; j++)
bgp->confed_peers[j - 1] = bgp->confed_peers[j];
bgp->confed_peers_cnt--;
if (bgp->confed_peers_cnt == 0) {
if (bgp->confed_peers)
XFREE(MTYPE_BGP_CONFED_LIST, bgp->confed_peers);
bgp->confed_peers = NULL;
} else
bgp->confed_peers =
XREALLOC(MTYPE_BGP_CONFED_LIST, bgp->confed_peers,
bgp->confed_peers_cnt * sizeof(as_t));
/* Now reset any peer who's remote AS has just been removed from the
CONFED */
if (bgp_config_check(bgp, BGP_CONFIG_CONFEDERATION)) {
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
if (peer->as == as) {
peer->local_as = bgp->confed_id;
if (BGP_IS_VALID_STATE_FOR_NOTIF(
peer->status)) {
peer->last_reset =
PEER_DOWN_CONFED_PEER_CHANGE;
bgp_notify_send(
peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_CEASE_CONFIG_CHANGE);
} else
bgp_session_reset_safe(peer, &nnode);
}
}
}
return 0;
}
/* Local preference configuration. */
int bgp_default_local_preference_set(struct bgp *bgp, uint32_t local_pref)
{
if (!bgp)
return -1;
bgp->default_local_pref = local_pref;
return 0;
}
int bgp_default_local_preference_unset(struct bgp *bgp)
{
if (!bgp)
return -1;
bgp->default_local_pref = BGP_DEFAULT_LOCAL_PREF;
return 0;
}
/* Local preference configuration. */
int bgp_default_subgroup_pkt_queue_max_set(struct bgp *bgp, uint32_t queue_size)
{
if (!bgp)
return -1;
bgp->default_subgroup_pkt_queue_max = queue_size;
return 0;
}
int bgp_default_subgroup_pkt_queue_max_unset(struct bgp *bgp)
{
if (!bgp)
return -1;
bgp->default_subgroup_pkt_queue_max =
BGP_DEFAULT_SUBGROUP_PKT_QUEUE_MAX;
return 0;
}
/* Listen limit configuration. */
int bgp_listen_limit_set(struct bgp *bgp, int listen_limit)
{
if (!bgp)
return -1;
bgp->dynamic_neighbors_limit = listen_limit;
return 0;
}
int bgp_listen_limit_unset(struct bgp *bgp)
{
if (!bgp)
return -1;
bgp->dynamic_neighbors_limit = BGP_DYNAMIC_NEIGHBORS_LIMIT_DEFAULT;
return 0;
}
int bgp_map_afi_safi_iana2int(iana_afi_t pkt_afi, iana_safi_t pkt_safi,
afi_t *afi, safi_t *safi)
{
/* Map from IANA values to internal values, return error if
* values are unrecognized.
*/
*afi = afi_iana2int(pkt_afi);
*safi = safi_iana2int(pkt_safi);
if (*afi == AFI_MAX || *safi == SAFI_MAX)
return -1;
return 0;
}
int bgp_map_afi_safi_int2iana(afi_t afi, safi_t safi, iana_afi_t *pkt_afi,
iana_safi_t *pkt_safi)
{
/* Map from internal values to IANA values, return error if
* internal values are bad (unexpected).
*/
if (afi == AFI_MAX || safi == SAFI_MAX)
return -1;
*pkt_afi = afi_int2iana(afi);
*pkt_safi = safi_int2iana(safi);
return 0;
}
struct peer_af *peer_af_create(struct peer *peer, afi_t afi, safi_t safi)
{
struct peer_af *af;
int afid;
if (!peer)
return NULL;
afid = afindex(afi, safi);
if (afid >= BGP_AF_MAX)
return NULL;
assert(peer->peer_af_array[afid] == NULL);
/* Allocate new peer af */
af = XCALLOC(MTYPE_BGP_PEER_AF, sizeof(struct peer_af));
peer->peer_af_array[afid] = af;
af->afi = afi;
af->safi = safi;
af->afid = afid;
af->peer = peer;
return af;
}
struct peer_af *peer_af_find(struct peer *peer, afi_t afi, safi_t safi)
{
int afid;
if (!peer)
return NULL;
afid = afindex(afi, safi);
if (afid >= BGP_AF_MAX)
return NULL;
return peer->peer_af_array[afid];
}
int peer_af_delete(struct peer *peer, afi_t afi, safi_t safi)
{
struct peer_af *af;
int afid;
if (!peer)
return -1;
afid = afindex(afi, safi);
if (afid >= BGP_AF_MAX)
return -1;
af = peer->peer_af_array[afid];
if (!af)
return -1;
bgp_stop_announce_route_timer(af);
if (PAF_SUBGRP(af)) {
if (BGP_DEBUG(update_groups, UPDATE_GROUPS))
zlog_debug("u%" PRIu64 ":s%" PRIu64 " remove peer %s",
af->subgroup->update_group->id,
af->subgroup->id, peer->host);
}
update_subgroup_remove_peer(af->subgroup, af);
peer->peer_af_array[afid] = NULL;
XFREE(MTYPE_BGP_PEER_AF, af);
return 0;
}
/* Peer comparison function for sorting. */
int peer_cmp(struct peer *p1, struct peer *p2)
{
if (p1->group && !p2->group)
return -1;
if (!p1->group && p2->group)
return 1;
if (p1->group == p2->group) {
if (p1->conf_if && !p2->conf_if)
return -1;
if (!p1->conf_if && p2->conf_if)
return 1;
if (p1->conf_if && p2->conf_if)
return if_cmp_name_func(p1->conf_if, p2->conf_if);
} else
return strcmp(p1->group->name, p2->group->name);
return sockunion_cmp(&p1->su, &p2->su);
}
static unsigned int peer_hash_key_make(void *p)
{
struct peer *peer = p;
return sockunion_hash(&peer->su);
}
static int peer_hash_same(const void *p1, const void *p2)
{
const struct peer *peer1 = p1;
const struct peer *peer2 = p2;
return (sockunion_same(&peer1->su, &peer2->su)
&& CHECK_FLAG(peer1->flags, PEER_FLAG_CONFIG_NODE)
== CHECK_FLAG(peer2->flags, PEER_FLAG_CONFIG_NODE));
}
void peer_flag_inherit(struct peer *peer, uint32_t flag)
{
bool group_val;
/* Skip if peer is not a peer-group member. */
if (!peer_group_active(peer))
return;
/* Unset override flag to signal inheritance from peer-group. */
UNSET_FLAG(peer->flags_override, flag);
/*
* Inherit flag state from peer-group. If the flag of the peer-group is
* not being inverted, the peer must inherit the inverse of the current
* peer-group flag state.
*/
group_val = CHECK_FLAG(peer->group->conf->flags, flag);
if (!CHECK_FLAG(peer->group->conf->flags_invert, flag)
&& CHECK_FLAG(peer->flags_invert, flag))
COND_FLAG(peer->flags, flag, !group_val);
else
COND_FLAG(peer->flags, flag, group_val);
}
int peer_af_flag_check(struct peer *peer, afi_t afi, safi_t safi, uint32_t flag)
{
return CHECK_FLAG(peer->af_flags[afi][safi], flag);
}
void peer_af_flag_inherit(struct peer *peer, afi_t afi, safi_t safi,
uint32_t flag)
{
bool group_val;
/* Skip if peer is not a peer-group member. */
if (!peer_group_active(peer))
return;
/* Unset override flag to signal inheritance from peer-group. */
UNSET_FLAG(peer->af_flags_override[afi][safi], flag);
/*
* Inherit flag state from peer-group. If the flag of the peer-group is
* not being inverted, the peer must inherit the inverse of the current
* peer-group flag state.
*/
group_val = CHECK_FLAG(peer->group->conf->af_flags[afi][safi], flag);
if (!CHECK_FLAG(peer->group->conf->af_flags_invert[afi][safi], flag)
&& CHECK_FLAG(peer->af_flags_invert[afi][safi], flag))
COND_FLAG(peer->af_flags[afi][safi], flag, !group_val);
else
COND_FLAG(peer->af_flags[afi][safi], flag, group_val);
}
static bool peergroup_flag_check(struct peer *peer, uint32_t flag)
{
if (!peer_group_active(peer)) {
if (CHECK_FLAG(peer->flags_invert, flag))
return !CHECK_FLAG(peer->flags, flag);
else
return !!CHECK_FLAG(peer->flags, flag);
}
return !!CHECK_FLAG(peer->flags_override, flag);
}
static bool peergroup_af_flag_check(struct peer *peer, afi_t afi, safi_t safi,
uint32_t flag)
{
if (!peer_group_active(peer)) {
if (CHECK_FLAG(peer->af_flags_invert[afi][safi], flag))
return !peer_af_flag_check(peer, afi, safi, flag);
else
return !!peer_af_flag_check(peer, afi, safi, flag);
}
return !!CHECK_FLAG(peer->af_flags_override[afi][safi], flag);
}
static bool peergroup_filter_check(struct peer *peer, afi_t afi, safi_t safi,
uint8_t type, int direct)
{
struct bgp_filter *filter;
if (peer_group_active(peer))
return !!CHECK_FLAG(peer->filter_override[afi][safi][direct],
type);
filter = &peer->filter[afi][safi];
switch (type) {
case PEER_FT_DISTRIBUTE_LIST:
return !!(filter->dlist[direct].name);
case PEER_FT_FILTER_LIST:
return !!(filter->aslist[direct].name);
case PEER_FT_PREFIX_LIST:
return !!(filter->plist[direct].name);
case PEER_FT_ROUTE_MAP:
return !!(filter->map[direct].name);
case PEER_FT_UNSUPPRESS_MAP:
return !!(filter->usmap.name);
default:
return false;
}
}
/* Check peer's AS number and determines if this peer is IBGP or EBGP */
static inline bgp_peer_sort_t peer_calc_sort(struct peer *peer)
{
struct bgp *bgp;
bgp = peer->bgp;
/* Peer-group */
if (CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
if (peer->as_type == AS_INTERNAL)
return BGP_PEER_IBGP;
else if (peer->as_type == AS_EXTERNAL)
return BGP_PEER_EBGP;
else if (peer->as_type == AS_SPECIFIED && peer->as) {
assert(bgp);
return (bgp->as == peer->as ? BGP_PEER_IBGP
: BGP_PEER_EBGP);
}
else {
struct peer *peer1;
assert(peer->group);
peer1 = listnode_head(peer->group->peer);
if (peer1)
return peer1->sort;
}
return BGP_PEER_INTERNAL;
}
/* Normal peer */
if (bgp && CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) {
if (peer->local_as == 0)
return BGP_PEER_INTERNAL;
if (peer->local_as == peer->as) {
if (bgp->as == bgp->confed_id) {
if (peer->local_as == bgp->as)
return BGP_PEER_IBGP;
else
return BGP_PEER_EBGP;
} else {
if (peer->local_as == bgp->confed_id)
return BGP_PEER_EBGP;
else
return BGP_PEER_IBGP;
}
}
if (bgp_confederation_peers_check(bgp, peer->as))
return BGP_PEER_CONFED;
return BGP_PEER_EBGP;
} else {
if (peer->as_type != AS_SPECIFIED)
return (peer->as_type == AS_INTERNAL ? BGP_PEER_IBGP
: BGP_PEER_EBGP);
return (peer->local_as == 0
? BGP_PEER_INTERNAL
: peer->local_as == peer->as ? BGP_PEER_IBGP
: BGP_PEER_EBGP);
}
}
/* Calculate and cache the peer "sort" */
bgp_peer_sort_t peer_sort(struct peer *peer)
{
peer->sort = peer_calc_sort(peer);
return peer->sort;
}
static void peer_free(struct peer *peer)
{
assert(peer->status == Deleted);
QOBJ_UNREG(peer);
/* this /ought/ to have been done already through bgp_stop earlier,
* but just to be sure..
*/
bgp_timer_set(peer);
bgp_reads_off(peer);
bgp_writes_off(peer);
assert(!peer->t_write);
assert(!peer->t_read);
BGP_EVENT_FLUSH(peer);
pthread_mutex_destroy(&peer->io_mtx);
/* Free connected nexthop, if present */
if (CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)
&& !peer_dynamic_neighbor(peer))
bgp_delete_connected_nexthop(family2afi(peer->su.sa.sa_family),
peer);
XFREE(MTYPE_PEER_TX_SHUTDOWN_MSG, peer->tx_shutdown_message);
if (peer->desc) {
XFREE(MTYPE_PEER_DESC, peer->desc);
peer->desc = NULL;
}
/* Free allocated host character. */
if (peer->host) {
XFREE(MTYPE_BGP_PEER_HOST, peer->host);
peer->host = NULL;
}
if (peer->domainname) {
XFREE(MTYPE_BGP_PEER_HOST, peer->domainname);
peer->domainname = NULL;