src/rstp/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 /* NOTE: This machine is not used in 802.1D (leu) */
  27
  28 #define this _this
  29 #include "base.h"
  30 #include "stpm.h"
  31
  32 #define STATES {        \
  33   CHOOSE(DISABLED),         \
  34   CHOOSE(DETECTED),     \
  35   CHOOSE(DELEAYED),     \
  36   CHOOSE(RESOLVED),     \
  37 }
  38
  39 #define GET_STATE_NAME STP_edge_get_state_name
  40 #include "choose.h"
  41
  42 #define DEFAULT_LINK_DELAY  3
  43
  44 void
  45 STP_edge_enter_state (STATE_MACH_T *s)
  46 {
  47   register PORT_T *port = s->owner.port;
  48
  49   switch (s->State) {
  50     case BEGIN:
  51       break;
  52     case DISABLED:
  53       port->operEdge = port->adminEdge;
  54       port->wasInitBpdu = False;
  55       port->lnkWhile = 0;
  56       port->portEnabled = False;
  57       break;
  58     case DETECTED:
  59       port->portEnabled = True;
  60       port->lnkWhile = port->LinkDelay;
  61       port->operEdge = False;
  62       break;
  63     case DELEAYED:
  64       break;
  65     case RESOLVED:
  66       if (! port->wasInitBpdu) {
  67           port->operEdge = port->adminEdge;
  68       }
  69       break;
  70   }
  71 }
  72
  73 Bool
  74 STP_edge_check_conditions (STATE_MACH_T *s)
  75 {
  76   register PORT_T *port = s->owner.port;
  77
  78   switch (s->State) {
  79     case BEGIN:
  80       return STP_hop_2_state (s, DISABLED);
  81     case DISABLED:
  82       if (port->adminEnable) {
  83         return STP_hop_2_state (s, DETECTED);
  84       }
  85       break;
  86     case DETECTED:
  87       return STP_hop_2_state (s, DELEAYED);
  88     case DELEAYED:
  89       if (port->wasInitBpdu) {
  90 #ifdef STP_DBG
  91         if (s->debug)
  92             stp_trace ("port %s 'edge' resolved by BPDU", port->port_name);
  93 #endif
  94         return STP_hop_2_state (s, RESOLVED);
  95       }
  96
  97       if (! port->lnkWhile)  {
  98 #ifdef STP_DBG
  99         if (s->debug)
 100           stp_trace ("port %s 'edge' resolved by timer", port->port_name);
 101 #endif
 102         return STP_hop_2_state (s, RESOLVED);
 103       }
 104
 105       if (! port->adminEnable) {
 106         return STP_hop_2_state (s, DISABLED);
 107       }
 108       break;
 109     case RESOLVED:
 110       if (! port->adminEnable) {
 111         return STP_hop_2_state (s, DISABLED);
 112       }
 113       break;
 114   }
 115   return False;
 116 }
 117