/* Execute event process. */
int
bgp_event (struct thread *thread)
{
int ret = 0;
int event;
int next;
struct peer *peer;
peer = THREAD_ARG (thread);
event = THREAD_VAL (thread);
/* Logging this event. */
next = FSM [peer->status -1][event - 1].next_state;
if (BGP_DEBUG (fsm, FSM) && peer->status != next)
plog_debug (peer->log, "%s [FSM] %s (%s->%s)", peer->host,
bgp_event_str[event],
LOOKUP (bgp_status_msg, peer->status),
LOOKUP (bgp_status_msg, next));
/* Call function. */
if (FSM [peer->status -1][event - 1].func)
ret = (*(FSM [peer->status - 1][event - 1].func))(peer);
/* When function do not want proceed next job return -1. */
if (ret >= 0)
{
/* If status is changed. */
if (next != peer->status)
{
/* Transition into Clearing must /always/ clear all routes.. */
if (next == Clearing)
bgp_clear_route_all (peer);
bgp_fsm_change_status (peer, next);
}
/* Make sure timer is set. */
bgp_timer_set (peer);
}
return ret;
}
/* Called after event occured, this function change status and reset
read/write and timer thread. */
void
bgp_fsm_change_status (struct peer *peer, int status)
{
bgp_dump_state (peer, peer->status, status);
/* Transition into Clearing or Deleted must /always/ clear all routes..
* (and must do so before actually changing into Deleted..
*/
if (status >= Clearing)
bgp_clear_route_all (peer);
/* Preserve old status and change into new status. */
peer->ostatus = peer->status;
peer->status = status;
if (BGP_DEBUG (normal, NORMAL))
zlog_debug ("%s went from %s to %s",
peer->host,
LOOKUP (bgp_status_msg, peer->ostatus),
LOOKUP (bgp_status_msg, peer->status));
}
/* Called after event occured, this function change status and reset
read/write and timer thread. */
void
bgp_fsm_change_status (struct peer *peer, int status)
{
bgp_dump_state (peer, peer->status, status);
/* Transition into Clearing or Deleted must /always/ clear all routes..
* (and must do so before actually changing into Deleted..
*/
if (status >= Clearing)
{
bgp_clear_route_all (peer);
/* If no route was queued for the clear-node processing, generate the
* completion event here. This is needed because if there are no routes
* to trigger the background clear-node thread, the event won't get
* generated and the peer would be stuck in Clearing. Note that this
* event is for the peer and helps the peer transition out of Clearing
* state; it should not be generated per (AFI,SAFI). The event is
* directly posted here without calling clear_node_complete() as we
* shouldn't do an extra unlock. This event will get processed after
* the state change that happens below, so peer will be in Clearing
* (or Deleted).
*/
if (!work_queue_is_scheduled (peer->clear_node_queue))
BGP_EVENT_ADD (peer, Clearing_Completed);
}
/* Preserve old status and change into new status. */
peer->ostatus = peer->status;
peer->status = status;
if (BGP_DEBUG (normal, NORMAL))
zlog_debug ("%s went from %s to %s",
peer->host,
LOOKUP (bgp_status_msg, peer->ostatus),
LOOKUP (bgp_status_msg, peer->status));
}
/* Administrative BGP peer stop event. */
int
bgp_stop (struct peer *peer)
{
afi_t afi;
safi_t safi;
char orf_name[BUFSIZ];
if (CHECK_FLAG (peer->sflags, PEER_STATUS_CREATE_INIT))
return 0;
/* Increment Dropped count. */
if (peer->status == Established)
{
bgp_fsm_change_status (peer, Idle);
peer->dropped++;
/* bgp log-neighbor-changes of neighbor Down */
if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES))
zlog_info ("%%ADJCHANGE: neighbor %s Down %s", peer->host,
peer_down_str [(int) peer->last_reset]);
/* graceful restart */
if (peer->t_gr_stale)
{
BGP_TIMER_OFF (peer->t_gr_stale);
if (BGP_DEBUG (events, EVENTS))
zlog_info ("%s graceful restart stalepath timer stopped", peer->host);
}
if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT))
{
if (BGP_DEBUG (events, EVENTS))
{
zlog_info ("%s graceful restart timer started for %d sec",
peer->host, peer->v_gr_restart);
zlog_info ("%s graceful restart stalepath timer started for %d sec",
peer->host, peer->bgp->stalepath_time);
}
BGP_TIMER_ON (peer->t_gr_restart, bgp_graceful_restart_timer_expire,
peer->v_gr_restart);
BGP_TIMER_ON (peer->t_gr_stale, bgp_graceful_stale_timer_expire,
peer->bgp->stalepath_time);
}
else
{
UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE);
for (afi = AFI_IP ; afi < AFI_MAX ; afi++)
for (safi = SAFI_UNICAST ; safi < SAFI_UNICAST_MULTICAST ; safi++)
peer->nsf[afi][safi] = 0;
}
/* set last reset time */
peer->resettime = time (NULL);
#ifdef HAVE_SNMP
bgpTrapBackwardTransition (peer);
#endif /* HAVE_SNMP */
/* Reset uptime. */
bgp_uptime_reset (peer);
/* Need of clear of peer. */
bgp_clear_route_all (peer);
/* Reset peer synctime */
for (afi = AFI_IP ; afi < AFI_MAX ; afi++)
for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++)
peer->synctime[afi][safi] = 0;
}
/* Stop read and write threads when exists. */
BGP_READ_OFF (peer->t_read);
BGP_WRITE_OFF (peer->t_write);
/* Stop all timers. */
BGP_TIMER_OFF (peer->t_start);
BGP_TIMER_OFF (peer->t_connect);
BGP_TIMER_OFF (peer->t_holdtime);
BGP_TIMER_OFF (peer->t_keepalive);
BGP_TIMER_OFF (peer->t_asorig);
for (afi = AFI_IP ; afi < AFI_MAX ; afi++)
for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++)
BGP_TIMER_OFF (peer->t_routeadv[afi][safi]);
/* Delete all existing events of the peer. */
BGP_EVENT_DELETE (peer);
/* Stream reset. */
peer->packet_size = 0;
/* Clear input and output buffer. */
if (peer->ibuf)
stream_reset (peer->ibuf);
if (peer->work)
stream_reset (peer->work);
stream_fifo_clean (peer->obuf);
/* Close of file descriptor. */
if (peer->fd >= 0)
{
close (peer->fd);
peer->fd = -1;
}
/* Connection information. */
if (peer->su_local)
{
XFREE (MTYPE_SOCKUNION, peer->su_local);
peer->su_local = NULL;
}
if (peer->su_remote)
{
XFREE (MTYPE_SOCKUNION, peer->su_remote);
peer->su_remote = NULL;
}
/* Clear remote router-id. */
peer->remote_id.s_addr = 0;
/* Clear peer capability flag. */
peer->cap = 0;
for (afi = AFI_IP ; afi < AFI_MAX ; afi++)
for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++)
{
/* Reset all negotiated variables */
peer->afc_nego[afi][safi] = 0;
peer->afc_adv[afi][safi] = 0;
peer->afc_recv[afi][safi] = 0;
/* peer address family capability flags*/
peer->af_cap[afi][safi] = 0;
/* peer address family status flags*/
peer->af_sflags[afi][safi] = 0;
/* Received ORF prefix-filter */
peer->orf_plist[afi][safi] = NULL;
/* ORF received prefix-filter pnt */
sprintf (orf_name, "%s.%d.%d", peer->host, afi, safi);
prefix_bgp_orf_remove_all (orf_name);
}
/* Reset keepalive and holdtime */
if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
{
peer->v_keepalive = peer->keepalive;
peer->v_holdtime = peer->holdtime;
}
else
{
peer->v_keepalive = peer->bgp->default_keepalive;
peer->v_holdtime = peer->bgp->default_holdtime;
}
peer->update_time = 0;
/* Until we are sure that there is no problem about prefix count
this should be commented out.*/
#if 0
/* Reset prefix count */
peer->pcount[AFI_IP][SAFI_UNICAST] = 0;
peer->pcount[AFI_IP][SAFI_MULTICAST] = 0;
peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0;
peer->pcount[AFI_IP6][SAFI_UNICAST] = 0;
peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0;
#endif /* 0 */
return 0;
}
/* Administrative BGP peer stop event. */
int
bgp_stop (struct peer *peer)
{
int established = 0;
afi_t afi;
safi_t safi;
char orf_name[BUFSIZ];
/* Increment Dropped count. */
if (peer->status == Established)
{
established = 1;
peer->dropped++;
bgp_fsm_change_status (peer, Idle);
#ifdef HAVE_SNMP
bgpTrapBackwardTransition (peer);
#endif /* HAVE_SNMP */
}
/* Reset uptime. */
bgp_uptime_reset (peer);
/* Need of clear of peer. */
if (established)
bgp_clear_route_all (peer);
/* Stop read and write threads when exists. */
BGP_READ_OFF (peer->t_read);
BGP_WRITE_OFF (peer->t_write);
/* Stop all timers. */
BGP_TIMER_OFF (peer->t_start);
BGP_TIMER_OFF (peer->t_connect);
BGP_TIMER_OFF (peer->t_holdtime);
BGP_TIMER_OFF (peer->t_keepalive);
BGP_TIMER_OFF (peer->t_asorig);
BGP_TIMER_OFF (peer->t_routeadv);
/* Delete all existing events of the peer. */
BGP_EVENT_DELETE (peer);
/* Stream reset. */
peer->packet_size = 0;
/* Clear input and output buffer. */
if (peer->ibuf)
stream_reset (peer->ibuf);
if (peer->work)
stream_reset (peer->work);
stream_fifo_clean (peer->obuf);
/* Close of file descriptor. */
if (peer->fd >= 0)
{
close (peer->fd);
peer->fd = -1;
}
/* Connection information. */
if (peer->su_local)
{
XFREE (MTYPE_SOCKUNION, peer->su_local);
peer->su_local = NULL;
}
if (peer->su_remote)
{
XFREE (MTYPE_SOCKUNION, peer->su_remote);
peer->su_remote = NULL;
}
/* Clear remote router-id. */
peer->remote_id.s_addr = 0;
/* Reset all negotiated variables */
peer->afc_nego[AFI_IP][SAFI_UNICAST] = 0;
peer->afc_nego[AFI_IP][SAFI_MULTICAST] = 0;
peer->afc_nego[AFI_IP][SAFI_MPLS_VPN] = 0;
peer->afc_nego[AFI_IP6][SAFI_UNICAST] = 0;
peer->afc_nego[AFI_IP6][SAFI_MULTICAST] = 0;
peer->afc_adv[AFI_IP][SAFI_UNICAST] = 0;
peer->afc_adv[AFI_IP][SAFI_MULTICAST] = 0;
peer->afc_adv[AFI_IP][SAFI_MPLS_VPN] = 0;
peer->afc_adv[AFI_IP6][SAFI_UNICAST] = 0;
peer->afc_adv[AFI_IP6][SAFI_MULTICAST] = 0;
peer->afc_recv[AFI_IP][SAFI_UNICAST] = 0;
peer->afc_recv[AFI_IP][SAFI_MULTICAST] = 0;
peer->afc_recv[AFI_IP][SAFI_MPLS_VPN] = 0;
peer->afc_recv[AFI_IP6][SAFI_UNICAST] = 0;
peer->afc_recv[AFI_IP6][SAFI_MULTICAST] = 0;
/* Reset route refresh flag. */
UNSET_FLAG (peer->cap, PEER_CAP_REFRESH_ADV);
UNSET_FLAG (peer->cap, PEER_CAP_REFRESH_OLD_RCV);
UNSET_FLAG (peer->cap, PEER_CAP_REFRESH_NEW_RCV);
UNSET_FLAG (peer->cap, PEER_CAP_DYNAMIC_ADV);
UNSET_FLAG (peer->cap, PEER_CAP_DYNAMIC_RCV);
for (afi = AFI_IP ; afi < AFI_MAX ; afi++)
for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++)
{
/* peer address family capability flags*/
peer->af_cap[afi][safi] = 0;
/* peer address family status flags*/
peer->af_sflags[afi][safi] = 0;
/* Received ORF prefix-filter */
peer->orf_plist[afi][safi] = NULL;
/* ORF received prefix-filter pnt */
sprintf (orf_name, "%s.%d.%d", peer->host, afi, safi);
prefix_bgp_orf_remove_all (orf_name);
}
UNSET_FLAG (peer->af_flags[AFI_IP][SAFI_UNICAST],
PEER_FLAG_DEFAULT_ORIGINATE_CHECK);
UNSET_FLAG (peer->af_flags[AFI_IP][SAFI_MULTICAST],
PEER_FLAG_DEFAULT_ORIGINATE_CHECK);
UNSET_FLAG (peer->af_flags[AFI_IP6][SAFI_UNICAST],
PEER_FLAG_DEFAULT_ORIGINATE_CHECK);
UNSET_FLAG (peer->af_flags[AFI_IP6][SAFI_MULTICAST],
PEER_FLAG_DEFAULT_ORIGINATE_CHECK);
/* Reset keepalive and holdtime */
if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
{
peer->v_keepalive = peer->keepalive;
peer->v_holdtime = peer->holdtime;
}
else
{
peer->v_keepalive = peer->bgp->default_keepalive;
peer->v_holdtime = peer->bgp->default_holdtime;
}
peer->update_time = 0;
/* Until we are sure that there is no problem about prefix count
this should be commented out.*/
#if 0
/* Reset prefix count */
peer->pcount[AFI_IP][SAFI_UNICAST] = 0;
peer->pcount[AFI_IP][SAFI_MULTICAST] = 0;
peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0;
peer->pcount[AFI_IP6][SAFI_UNICAST] = 0;
peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0;
#endif /* 0 */
return 0;
}
