librstp/common/topoch.c

4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai/************************************************************************
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * Copyright (C) 2001-2003 Optical Access
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * Author: Alex Rozin
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai *
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * This file is part of RSTP library.
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai *
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * RSTP library is free software; you can redistribute it and/or modify it
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * under the terms of the GNU Lesser General Public License as published by the
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * Free Software Foundation; version 2.1
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai *
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * RSTP library is distributed in the hope that it will be useful, but
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * WITHOUT ANY WARRANTY; without even the implied warranty of
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * General Public License for more details.
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai *
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * You should have received a copy of the GNU Lesser General Public License
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * along with RSTP library; see the file COPYING.  If not, write to the Free
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * 02111-1307, USA.
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai **********************************************************************/
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai/* Topolgy Change state machine : 17.25 */
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#include "base.h"
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#include "stpm.h"
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#include "stp_to.h" /* for STP_OUT_flush_lt */
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#define STATES { \
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  CHOOSE(INIT),             \
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  CHOOSE(INACTIVE),         \
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  CHOOSE(TCACTIVE),         \
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  CHOOSE(DETECTED),         \
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  CHOOSE(NOTIFIED_TC),          \
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  CHOOSE(PROPAGATING),          \
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  CHOOSE(ACKNOWLEDGED),         \
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  CHOOSE(NOTIFIED_TCN)         \
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai}
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#define GET_STATE_NAME STP_topoch_get_state_name
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#include "choose.h"
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#ifndef STRONGLY_SPEC_802_1W
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai/*
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * In many kinds of hardware the function
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * STP_OUT_flush_lt is a) is very hard and b) cannot
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * delete learning emtries per port. The alternate
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * method may be used: we don't care operEdge flag here,
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * but clean learning table once for TopologyChange
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * for all ports, except the received port. I am ready to discuss :(
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai * See below word STRONGLY_SPEC_802_1W
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai */
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#else
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavaistatic Bool
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavaiflush (STATE_MACH_T *this, char* reason) /* 17.19.9 */
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai{
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  register PORT_T* port = this->owner.port;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  Bool bret;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  if (port->operEdge) return True;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  if (this->debug) {
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    stp_trace("%s (%s, %s, %s, '%s')",
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        "flush", port->port_name, port->owner->name,
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        LT_FLASH_ONLY_THE_PORT == type ? "this port" : "other ports",
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        reason);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  }
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  bret = STP_OUT_flush_lt (port->port_index, port->owner->vlan_id,
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai                           LT_FLASH_ONLY_THE_PORT, reason);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai}
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#endif
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavaistatic void
4eaa471005973e11a6110b69fe990530b3b95a38Rishi SrivatsavaisetTcPropBridge (STATE_MACH_T* this, char* reason) /* 17.19.14 */
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai{
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  register PORT_T* port = this->owner.port;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  register PORT_T* tmp;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  for (tmp = port->owner->ports; tmp; tmp = tmp->next) {
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    if (tmp->port_index != port->port_index)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      tmp->tcProp = True;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  }
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#ifndef STRONGLY_SPEC_802_1W
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#ifdef STP_DBG
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  if (this->debug) {
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    stp_trace("%s (%s, %s, %s, '%s')",
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        "clearFDB", port->port_name, port->owner->name,
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        "other ports", reason);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  }
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#endif
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  STP_OUT_flush_lt (port->port_index, port->owner->vlan_id,
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai                    LT_FLASH_ALL_PORTS_EXCLUDE_THIS, reason);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#endif
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai}
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavaistatic unsigned int
4eaa471005973e11a6110b69fe990530b3b95a38Rishi SrivatsavainewTcWhile (STATE_MACH_T* this) /* 17.19.7 */
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai{
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  register PORT_T* port = this->owner.port;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  if (port->sendRSTP && port->operPointToPointMac) {
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    return 2 * port->owner->rootTimes.HelloTime;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  }
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  return port->owner->rootTimes.MaxAge;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai}
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavaivoid
4eaa471005973e11a6110b69fe990530b3b95a38Rishi SrivatsavaiSTP_topoch_enter_state (STATE_MACH_T* this)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai{
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  register PORT_T*      port = this->owner.port;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  switch (this->State) {
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case BEGIN:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case INIT:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#ifdef STRONGLY_SPEC_802_1W
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      flush (this, "topoch INIT");
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#endif
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tcWhile = 0;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tc =
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tcProp =
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tcAck = False;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case INACTIVE:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->rcvdTc =
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->rcvdTcn =
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->rcvdTcAck = port->tc = port->tcProp = False;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case TCACTIVE:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case DETECTED:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tcWhile = newTcWhile (this);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#ifdef STP_DBG
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  if (this->debug)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    stp_trace("DETECTED: tcWhile=%d on port %s",
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        port->tcWhile, port->port_name);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#endif
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      setTcPropBridge (this, "DETECTED");
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tc = False;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case NOTIFIED_TC:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->rcvdTcn = port->rcvdTc = False;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      if (port->role == DesignatedPort) {
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        port->tcAck = True;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      }
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      setTcPropBridge (this, "NOTIFIED_TC");
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case PROPAGATING:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tcWhile = newTcWhile (this);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#ifdef STP_DBG
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  if (this->debug)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    stp_trace("PROPAGATING: tcWhile=%d on port %s",
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        port->tcWhile, port->port_name);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#endif
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#ifdef STRONGLY_SPEC_802_1W
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      flush (this, "topoch PROPAGATING");
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#endif
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tcProp = False;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case ACKNOWLEDGED:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tcWhile = 0;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#ifdef STP_DBG
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  if (this->debug)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    stp_trace("ACKNOWLEDGED: tcWhile=%d on port %s",
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        port->tcWhile, port->port_name);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#endif
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->rcvdTcAck = False;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case NOTIFIED_TCN:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      port->tcWhile = newTcWhile (this);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#ifdef STP_DBG
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  if (this->debug)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    stp_trace("NOTIFIED_TCN: tcWhile=%d on port %s",
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        port->tcWhile, port->port_name);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai#endif
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  };
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai}
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi SrivatsavaiBool
4eaa471005973e11a6110b69fe990530b3b95a38Rishi SrivatsavaiSTP_topoch_check_conditions (STATE_MACH_T* this)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai{
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  register PORT_T*      port = this->owner.port;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  if (BEGIN == this->State) {
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    return STP_hop_2_state (this, INIT);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  }
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  switch (this->State) {
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case INIT:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      return STP_hop_2_state (this, INACTIVE);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case INACTIVE:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      if (port->role == RootPort || port->role == DesignatedPort)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        return STP_hop_2_state (this, TCACTIVE);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      if (port->rcvdTc || port->rcvdTcn || port->rcvdTcAck ||
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai          port->tc || port->tcProp)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        return STP_hop_2_state (this, INACTIVE);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case TCACTIVE:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      if (port->role != RootPort && (port->role != DesignatedPort))
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        return STP_hop_2_state (this, INIT);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      if (port->tc)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        return STP_hop_2_state (this, DETECTED);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      if (port->rcvdTcn)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        return STP_hop_2_state (this, NOTIFIED_TCN);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      if (port->rcvdTc)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        return STP_hop_2_state (this, NOTIFIED_TC);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      if (port->tcProp && !port->operEdge)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        return STP_hop_2_state (this, PROPAGATING);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      if (port->rcvdTcAck)
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai        return STP_hop_2_state (this, ACKNOWLEDGED);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      break;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case DETECTED:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      return STP_hop_2_state (this, TCACTIVE);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case NOTIFIED_TC:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      return STP_hop_2_state (this, TCACTIVE);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case PROPAGATING:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      return STP_hop_2_state (this, TCACTIVE);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case ACKNOWLEDGED:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      return STP_hop_2_state (this, TCACTIVE);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai    case NOTIFIED_TCN:
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai      return STP_hop_2_state (this, NOTIFIED_TC);
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  };
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai  return False;
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai}
4eaa471005973e11a6110b69fe990530b3b95a38Rishi Srivatsavai