rstplib/edge.c

   1 /************************************************************************
   2  * RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
   3  * Copyright (C) 2001-2003 Optical Access
   4  * Author: Alex Rozin
   5  *
   6  * This file is part of RSTP library.
   7  *
   8  * RSTP library is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by the
  10  * Free Software Foundation; version 2.1
  11  *
  12  * RSTP library is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with RSTP library; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  **********************************************************************/
  22
  23 /* Note: this state mashine distinkts from described in P802.1t Clause 18. */
  24 /* I am ready to discuss it                                                */
  25
  26 #include "base.h"
  27 #include "stpm.h"
  28
  29 #define STATES {        \
  30   CHOOSE(DISABLED),         \
  31   CHOOSE(DETECTED),     \
  32   CHOOSE(DELEAYED),     \
  33   CHOOSE(RESOLVED),     \
  34 }
  35
  36 #define GET_STATE_NAME STP_edge_get_state_name
  37 #include "choose.h"
  38
  39 #define DEFAULT_LINK_DELAY  3
  40
  41 void
  42 STP_edge_enter_state (STATE_MACH_T *s)
  43 {
  44   register PORT_T *port = s->owner.port;
  45
  46   switch (s->State) {
  47     case BEGIN:
  48       break;
  49     case DISABLED:
  50       port->operEdge = port->adminEdge;
  51       port->wasInitBpdu = False;
  52       port->lnkWhile = 0;
  53       port->portEnabled = False;
  54       break;
  55     case DETECTED:
  56       port->portEnabled = True;
  57       port->lnkWhile = port->LinkDelay;
  58       port->operEdge = False;
  59       break;
  60     case DELEAYED:
  61       break;
  62     case RESOLVED:
  63       if (! port->wasInitBpdu) {
  64           port->operEdge = port->adminEdge;
  65       }
  66       break;
  67   }
  68 }
  69
  70 Bool
  71 STP_edge_check_conditions (STATE_MACH_T *s)
  72 {
  73   register PORT_T *port = s->owner.port;
  74
  75   switch (s->State) {
  76     case BEGIN:
  77       return STP_hop_2_state (s, DISABLED);
  78     case DISABLED:
  79       if (port->adminEnable) {
  80         return STP_hop_2_state (s, DETECTED);
  81       }
  82       break;
  83     case DETECTED:
  84       return STP_hop_2_state (s, DELEAYED);
  85     case DELEAYED:
  86       if (port->wasInitBpdu) {
  87 #ifdef STP_DBG
  88         if (s->debug)
  89             stp_trace ("port %s 'edge' resolved by BPDU", port->port_name);
  90 #endif
  91         return STP_hop_2_state (s, RESOLVED);
  92       }
  93
  94       if (! port->lnkWhile)  {
  95 #ifdef STP_DBG
  96         if (s->debug)
  97           stp_trace ("port %s 'edge' resolved by timer", port->port_name);
  98 #endif
  99         return STP_hop_2_state (s, RESOLVED);
 100       }
 101
 102       if (! port->adminEnable) {
 103         return STP_hop_2_state (s, DISABLED);
 104       }
 105       break;
 106     case RESOLVED:
 107       if (! port->adminEnable) {
 108         return STP_hop_2_state (s, DISABLED);
 109       }
 110       break;
 111   }
 112   return False;
 113 }
 114