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bgpd: stricter packet handling in OpenSent

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Keepalives and updates are not expected in OpenSent, prior to receiving
the peer's open message.  Terminate the session with the proper
notification.

From: Leonid Rosenboim <lrosenbo@wrs.com>
[split off FSM changes, some reordering & cleanup.  read handling needs
 to be separately addressed]
Signed-off-by: David Lamparter <equinox@diac24.net>
This commit is contained in:
Leonid Rosenboim 2013-07-30 20:14:25 +02:00 committed by David Lamparter
parent c423d413e4
commit 397b5bded5
1 changed files with 41 additions and 18 deletions
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59
bgpd/bgp_fsm.c
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@ -592,6 +592,32 @@ bgp_stop_with_error (struct peer *peer)
return 0;
}
/* something went wrong, send notify and tear down */
static int
bgp_stop_with_notify (struct peer *peer, u_char code, u_char sub_code)
{
/* Send notify to remote peer */
bgp_notify_send (peer, code, sub_code);
/* Sweep if it is temporary peer. */
if (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER))
{
zlog_info ("%s [Event] Accepting BGP peer is deleted", peer->host);
peer_delete (peer);
return -1;
}
/* Clear start timer value to default. */
peer->v_start = BGP_INIT_START_TIMER;
/* bgp_stop needs to be invoked while in Established state */
bgp_stop(peer);
return 0;
}
/* TCP connection open. Next we send open message to remote peer. And
add read thread for reading open message. */
static int
@ -740,29 +766,26 @@ bgp_fsm_keepalive_expire (struct peer *peer)
return 0;
}
/* FSM error, unexpected event. This is error of BGP connection. So cut the
peer and change to Idle status. */
static int
bgp_fsm_event_error (struct peer *peer)
{
plog_err (peer->log, "%s [FSM] unexpected packet received in state %s",
peer->host, LOOKUP (bgp_status_msg, peer->status));
return bgp_stop_with_notify (peer, BGP_NOTIFY_FSM_ERR, 0);
}
/* Hold timer expire. This is error of BGP connection. So cut the
peer and change to Idle status. */
static int
bgp_fsm_holdtime_expire (struct peer *peer)
{
if (BGP_DEBUG (fsm, FSM))
zlog (peer->log, LOG_DEBUG, "%s [FSM] Hold timer expire", peer->host);
plog_debug (peer->log, "%s [FSM] Hold timer expire", peer->host);
/* Send notify to remote peer. */
bgp_notify_send (peer, BGP_NOTIFY_HOLD_ERR, 0);
/* Sweep if it is temporary peer. */
if (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER))
{
zlog_info ("%s [Event] Accepting BGP peer is deleted", peer->host);
peer_delete (peer);
return -1;
}
/* bgp_stop needs to be invoked while in Established state */
bgp_stop(peer);
return 0;
return bgp_stop_with_notify (peer, BGP_NOTIFY_HOLD_ERR, 0);
}
/* Status goes to Established. Send keepalive packet then make first
@ -977,8 +1000,8 @@ static const struct {
{bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */
{bgp_ignore, Idle}, /* KeepAlive_timer_expired */
{bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */
{bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */
{bgp_ignore, Idle}, /* Receive_UPDATE_message */
{bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */
{bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */
{bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */
{bgp_ignore, Idle}, /* Clearing_Completed */
},