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/************************************************************************
* RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
* Copyright (C) 2001-2003 Optical Access
* Author: Alex Rozin
*
* This file is part of RSTP library.
*
* RSTP library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; version 2.1
*
* RSTP library 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 Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with RSTP library; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
**********************************************************************/
/* Port State Transition state machine : 17.24 */
#include "base.h"
#include "stpm.h"
#include "stp_to.h"
#define STATES { \
CHOOSE(DISCARDING), \
CHOOSE(LEARNING), \
CHOOSE(FORWARDING) \
}
#define GET_STATE_NAME STP_sttrans_get_state_name
#include "choose.h"
#ifdef STRONGLY_SPEC_802_1W
static Bool
disableLearning (STATE_MACH_T *this)
{
register PORT_T *port = this->owner.port;
return STP_OUT_set_learning (port->port_index, port->owner->vlan_id, False);
}
static Bool
enableLearning (STATE_MACH_T *this)
{
register PORT_T *port = this->owner.port;
return STP_OUT_set_learning (port->port_index, port->owner->vlan_id, True);
}
static Bool
disableForwarding (STATE_MACH_T *this)
{
register PORT_T *port = this->owner.port;
return STP_OUT_set_forwarding (port->port_index, port->owner->vlan_id, False);
}
static Bool
enableForwarding (STATE_MACH_T *this)
{
register PORT_T *port = this->owner.port;
return STP_OUT_set_forwarding (port->port_index, port->owner->vlan_id, True);
}
#endif
void
STP_sttrans_enter_state (STATE_MACH_T *this)
{
register PORT_T *port = this->owner.port;
switch (this->State) {
case BEGIN:
case DISCARDING:
port->learning = False;
port->forwarding = False;
#ifdef STRONGLY_SPEC_802_1W
disableLearning (this);
disableForwarding (this);
#else
STP_OUT_set_port_state (port->port_index, port->owner->vlan_id, UID_PORT_DISCARDING);
#endif
break;
case LEARNING:
port->learning = True;
#ifdef STRONGLY_SPEC_802_1W
enableLearning (this);
#else
STP_OUT_set_port_state (port->port_index, port->owner->vlan_id, UID_PORT_LEARNING);
#endif
break;
case FORWARDING:
port->tc = !port->operEdge;
port->forwarding = True;
#ifdef STRONGLY_SPEC_802_1W
enableForwarding (this);
#else
STP_OUT_set_port_state (port->port_index, port->owner->vlan_id, UID_PORT_FORWARDING);
#endif
break;
}
}
Bool
STP_sttrans_check_conditions (STATE_MACH_T *this)
{
register PORT_T *port = this->owner.port;
switch (this->State) {
case BEGIN:
return STP_hop_2_state (this, DISCARDING);
case DISCARDING:
if (port->learn) {
return STP_hop_2_state (this, LEARNING);
}
break;
case LEARNING:
if (port->forward) {
return STP_hop_2_state (this, FORWARDING);
}
if (!port->learn) {
return STP_hop_2_state (this, DISCARDING);
}
break;
case FORWARDING:
if (!port->forward) {
return STP_hop_2_state (this, DISCARDING);
}
break;
}
return False;
}
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