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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 |