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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 Protocol Migration state machine : 17.26 */
#include "base.h"
#include "stpm.h"
#define STATES { \
CHOOSE(INIT), \
CHOOSE(SEND_RSTP), \
CHOOSE(SENDING_RSTP), \
CHOOSE(SEND_STP), \
CHOOSE(SENDING_STP) \
}
#define GET_STATE_NAME STP_migrate_get_state_name
#include "choose.h"
#define MigrateTime 3 /* 17,16.4 */
void
STP_migrate_enter_state (STATE_MACH_T* this)
{
register PORT_T* port = this->owner.port;
switch (this->State) {
case BEGIN:
case INIT:
port->initPm = True;
port->mcheck = False;
break;
case SEND_RSTP:
port->mdelayWhile = MigrateTime;
port->mcheck = port->initPm = False;
port->sendRSTP = True;
break;
case SENDING_RSTP:
port->rcvdRSTP = port->rcvdSTP = False;
break;
case SEND_STP:
port->mdelayWhile = MigrateTime;
port->sendRSTP = False;
port->initPm = False;
break;
case SENDING_STP:
port->rcvdRSTP = port->rcvdSTP = False;
break;
}
}
Bool
STP_migrate_check_conditions (STATE_MACH_T* this)
{
register PORT_T* port = this->owner.port;
if ((!port->portEnabled && !port->initPm) || BEGIN == this->State)
return STP_hop_2_state (this, INIT);
switch (this->State) {
case INIT:
if (port->portEnabled) {
return STP_hop_2_state (this, (port->owner->ForceVersion >= 2) ?
SEND_RSTP : SEND_STP);
}
break;
case SEND_RSTP:
return STP_hop_2_state (this, SENDING_RSTP);
case SENDING_RSTP:
if (port->mcheck)
return STP_hop_2_state (this, SEND_RSTP);
if (port->mdelayWhile &&
(port->rcvdSTP || port->rcvdRSTP)) {
return STP_hop_2_state (this, SENDING_RSTP);
}
if (!port->mdelayWhile && port->rcvdSTP) {
return STP_hop_2_state (this, SEND_STP);
}
if (port->owner->ForceVersion < 2) {
return STP_hop_2_state (this, SEND_STP);
}
break;
case SEND_STP:
return STP_hop_2_state (this, SENDING_STP);
case SENDING_STP:
if (port->mcheck)
return STP_hop_2_state (this, SEND_RSTP);
if (port->mdelayWhile &&
(port->rcvdSTP || port->rcvdRSTP))
return STP_hop_2_state (this, SENDING_STP);
if (!port->mdelayWhile && port->rcvdRSTP)
return STP_hop_2_state (this, SEND_RSTP);
break;
}
return False;
}
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