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 #include "stp_vectors.h"
29
30 #define STATES { \
31 CHOOSE(DISABLED), \
32 CHOOSE(DETECTED), \
33 CHOOSE(DELAYED), \
34 CHOOSE(RESOLVED) \
35 }
36
37 #define GET_STATE_NAME STP_edge_get_state_name
38 #include "choose.h"
39
40 #define DEFAULT_LINK_DELAY 3
41
42 void
STP_edge_enter_state(STATE_MACH_T * s)43 STP_edge_enter_state (STATE_MACH_T *s)
44 {
45 register PORT_T *port = s->owner.port;
46
47 switch (s->State) {
48 case BEGIN:
49 break;
50 case DISABLED:
51 port->operEdge = port->adminEdge;
52 port->wasInitBpdu = False;
53 port->lnkWhile = 0;
54 port->portEnabled = False;
55 break;
56 case DETECTED:
57 port->portEnabled = True;
58 port->lnkWhile = port->LinkDelay;
59 port->operEdge = False;
60 break;
61 case DELAYED:
62 break;
63 case RESOLVED:
64 if (! port->wasInitBpdu) {
65 port->operEdge = port->adminEdge;
66 }
67 break;
68 }
69 }
70
71 Bool
STP_edge_check_conditions(STATE_MACH_T * s)72 STP_edge_check_conditions (STATE_MACH_T *s)
73 {
74 register PORT_T *port = s->owner.port;
75
76 /* If we're disabled, then stay that way. */
77 if (!port->adminEnable) {
78 if (s->State == DISABLED)
79 return False;
80 else
81 return STP_hop_2_state (s, DISABLED);
82 }
83
84 switch (s->State) {
85 case BEGIN:
86 return STP_hop_2_state (s, DISABLED);
87 case DISABLED:
88 if (port->adminEnable) {
89 return STP_hop_2_state (s, DETECTED);
90 }
91 break;
92 case DETECTED:
93 return STP_hop_2_state (s, DELAYED);
94 case DELAYED:
95 if (port->wasInitBpdu) {
96 #ifdef STP_DBG
97 if (s->debug)
98 stp_trace ("port %s 'edge' resolved by BPDU", port->port_name);
99 #endif
100 return STP_hop_2_state (s, RESOLVED);
101 }
102
103 if (! port->lnkWhile) {
104 #ifdef STP_DBG
105 if (s->debug)
106 stp_trace ("port %s 'edge' resolved by timer", port->port_name);
107 #endif
108 return STP_hop_2_state (s, RESOLVED);
109 }
110 break;
111 case RESOLVED:
112 break;
113 }
114 return False;
115 }
116