migrate.c
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上传日期:2021-08-29
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文件大小:3k
- /************************************************************************
- * 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;
- }