migrate.c revision 10491:8893b747ecdf 
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/* Port Protocol Migration state machine : 17.26 */
24
25#include "base.h"
26#include "stpm.h"
27
28#define STATES { \
29  CHOOSE(INIT),     \
30  CHOOSE(SEND_RSTP),    \
31  CHOOSE(SENDING_RSTP), \
32  CHOOSE(SEND_STP), \
33  CHOOSE(SENDING_STP)  \
34}
35
36#define GET_STATE_NAME STP_migrate_get_state_name
37#include "choose.h"
38
39#define MigrateTime 3 /* 17,16.4 */
40
41void
42STP_migrate_enter_state (STATE_MACH_T* this)
43{
44  register PORT_T*       port = this->owner.port;
45
46  switch (this->State) {
47    case BEGIN:
48    case INIT:
49      port->initPm = True;
50      port->mcheck = False;
51      break;
52    case SEND_RSTP:
53      port->mdelayWhile = MigrateTime;
54      port->mcheck = port->initPm = False;
55      port->sendRSTP = True;
56      break;
57    case SENDING_RSTP:
58      port->rcvdRSTP = port->rcvdSTP = False;
59      break;
60    case SEND_STP:
61      port->mdelayWhile = MigrateTime;
62      port->sendRSTP = False;
63      port->initPm = False;
64      break;
65    case SENDING_STP:
66      port->rcvdRSTP = port->rcvdSTP = False;
67      break;
68  }
69}
70
71Bool
72STP_migrate_check_conditions (STATE_MACH_T* this)
73{
74  register PORT_T*    port = this->owner.port;
75
76  if ((!port->portEnabled && !port->initPm) || BEGIN == this->State)
77    return STP_hop_2_state (this, INIT);
78
79  switch (this->State) {
80    case INIT:
81      if (port->portEnabled) {
82        return STP_hop_2_state (this, (port->owner->ForceVersion >= 2) ?
83                                   SEND_RSTP : SEND_STP);
84      }
85      break;
86    case SEND_RSTP:
87      return STP_hop_2_state (this, SENDING_RSTP);
88    case SENDING_RSTP:
89      if (port->mcheck)
90        return STP_hop_2_state (this, SEND_RSTP);
91      if (port->mdelayWhile &&
92          (port->rcvdSTP || port->rcvdRSTP)) {
93        return STP_hop_2_state (this, SENDING_RSTP);
94      }
95
96      if (!port->mdelayWhile && port->rcvdSTP) {
97        return STP_hop_2_state (this, SEND_STP);
98      }
99
100      if (port->owner->ForceVersion < 2) {
101        return STP_hop_2_state (this, SEND_STP);
102      }
103
104      break;
105    case SEND_STP:
106      return STP_hop_2_state (this, SENDING_STP);
107    case SENDING_STP:
108      if (port->mcheck)
109        return STP_hop_2_state (this, SEND_RSTP);
110      if (port->mdelayWhile &&
111          (port->rcvdSTP || port->rcvdRSTP))
112        return STP_hop_2_state (this, SENDING_STP);
113      if (!port->mdelayWhile && port->rcvdRSTP)
114        return STP_hop_2_state (this, SEND_RSTP);
115      break;
116  }
117  return False;
118}
119
120