sttrans.c
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上传日期:2021-08-29
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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;
- if (BEGIN == this->State) {
- return STP_hop_2_state (this, DISCARDING);
- }
- switch (this->State) {
- 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;
- }