1: /*
2: * IS-IS Rout(e)ing protocol - isis_csm.c
3: * IS-IS circuit state machine
4: * Copyright (C) 2001,2002 Sampo Saaristo
5: * Tampere University of Technology
6: * Institute of Communications Engineering
7: *
8: * This program is free software; you can redistribute it and/or modify it
9: * under the terms of the GNU General Public Licenseas published by the Free
10: * Software Foundation; either version 2 of the License, or (at your option)
11: * any later version.
12: *
13: * This program is distributed in the hope that it will be useful,but WITHOUT
14: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16: * more details.
17: *
18: * You should have received a copy of the GNU General Public License along
19: * with this program; if not, write to the Free Software Foundation, Inc.,
20: * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21: */
22:
23: #include <zebra.h>
24:
25: #include "log.h"
26: #include "memory.h"
27: #include "if.h"
28: #include "linklist.h"
29: #include "command.h"
30: #include "thread.h"
31: #include "hash.h"
32: #include "prefix.h"
33: #include "stream.h"
34:
35: #include "isisd/dict.h"
36: #include "isisd/include-netbsd/iso.h"
37: #include "isisd/isis_constants.h"
38: #include "isisd/isis_common.h"
39: #include "isisd/isis_flags.h"
40: #include "isisd/isis_circuit.h"
41: #include "isisd/isis_tlv.h"
42: #include "isisd/isis_lsp.h"
43: #include "isisd/isis_pdu.h"
44: #include "isisd/isis_network.h"
45: #include "isisd/isis_misc.h"
46: #include "isisd/isis_constants.h"
47: #include "isisd/isis_adjacency.h"
48: #include "isisd/isis_dr.h"
49: #include "isisd/isisd.h"
50: #include "isisd/isis_csm.h"
51: #include "isisd/isis_events.h"
52:
53: extern struct isis *isis;
54:
55: static const char *csm_statestr[] = {
56: "C_STATE_NA",
57: "C_STATE_INIT",
58: "C_STATE_CONF",
59: "C_STATE_UP"
60: };
61:
62: #define STATE2STR(S) csm_statestr[S]
63:
64: static const char *csm_eventstr[] = {
65: "NO_STATE",
66: "ISIS_ENABLE",
67: "IF_UP_FROM_Z",
68: "ISIS_DISABLE",
69: "IF_DOWN_FROM_Z",
70: };
71:
72: #define EVENT2STR(E) csm_eventstr[E]
73:
74: struct isis_circuit *
75: isis_csm_state_change (int event, struct isis_circuit *circuit, void *arg)
76: {
77: int old_state;
78:
79: old_state = circuit ? circuit->state : C_STATE_NA;
80: if (isis->debugs & DEBUG_EVENTS)
81: zlog_debug ("CSM_EVENT: %s", EVENT2STR (event));
82:
83: switch (old_state)
84: {
85: case C_STATE_NA:
86: if (circuit)
87: zlog_warn ("Non-null circuit while state C_STATE_NA");
88: assert (circuit == NULL);
89: switch (event)
90: {
91: case ISIS_ENABLE:
92: circuit = isis_circuit_new ();
93: isis_circuit_configure (circuit, (struct isis_area *) arg);
94: circuit->state = C_STATE_CONF;
95: break;
96: case IF_UP_FROM_Z:
97: circuit = isis_circuit_new ();
98: isis_circuit_if_add (circuit, (struct interface *) arg);
99: listnode_add (isis->init_circ_list, circuit);
100: circuit->state = C_STATE_INIT;
101: break;
102: case ISIS_DISABLE:
103: zlog_warn ("circuit already disabled");
104: break;
105: case IF_DOWN_FROM_Z:
106: zlog_warn ("circuit already disconnected");
107: break;
108: }
109: break;
110: case C_STATE_INIT:
111: assert (circuit);
112: switch (event)
113: {
114: case ISIS_ENABLE:
115: isis_circuit_configure (circuit, (struct isis_area *) arg);
116: if (isis_circuit_up (circuit) != ISIS_OK)
117: {
118: isis_circuit_deconfigure (circuit, (struct isis_area *) arg);
119: break;
120: }
121: circuit->state = C_STATE_UP;
122: isis_event_circuit_state_change (circuit, circuit->area, 1);
123: listnode_delete (isis->init_circ_list, circuit);
124: break;
125: case IF_UP_FROM_Z:
126: assert (circuit);
127: zlog_warn ("circuit already connected");
128: break;
129: case ISIS_DISABLE:
130: zlog_warn ("circuit already disabled");
131: break;
132: case IF_DOWN_FROM_Z:
133: isis_circuit_if_del (circuit, (struct interface *) arg);
134: listnode_delete (isis->init_circ_list, circuit);
135: isis_circuit_del (circuit);
136: circuit = NULL;
137: break;
138: }
139: break;
140: case C_STATE_CONF:
141: assert (circuit);
142: switch (event)
143: {
144: case ISIS_ENABLE:
145: zlog_warn ("circuit already enabled");
146: break;
147: case IF_UP_FROM_Z:
148: isis_circuit_if_add (circuit, (struct interface *) arg);
149: if (isis_circuit_up (circuit) != ISIS_OK)
150: {
151: isis_circuit_if_del (circuit, (struct interface *) arg);
152: break;
153: }
154: circuit->state = C_STATE_UP;
155: isis_event_circuit_state_change (circuit, circuit->area, 1);
156: break;
157: case ISIS_DISABLE:
158: isis_circuit_deconfigure (circuit, (struct isis_area *) arg);
159: isis_circuit_del (circuit);
160: circuit = NULL;
161: break;
162: case IF_DOWN_FROM_Z:
163: zlog_warn ("circuit already disconnected");
164: break;
165: }
166: break;
167: case C_STATE_UP:
168: assert (circuit);
169: switch (event)
170: {
171: case ISIS_ENABLE:
172: zlog_warn ("circuit already configured");
173: break;
174: case IF_UP_FROM_Z:
175: zlog_warn ("circuit already connected");
176: break;
177: case ISIS_DISABLE:
178: isis_circuit_down (circuit);
179: isis_circuit_deconfigure (circuit, (struct isis_area *) arg);
180: circuit->state = C_STATE_INIT;
181: isis_event_circuit_state_change (circuit,
182: (struct isis_area *)arg, 0);
183: listnode_add (isis->init_circ_list, circuit);
184: break;
185: case IF_DOWN_FROM_Z:
186: isis_circuit_down (circuit);
187: isis_circuit_if_del (circuit, (struct interface *) arg);
188: circuit->state = C_STATE_CONF;
189: isis_event_circuit_state_change (circuit, circuit->area, 0);
190: break;
191: }
192: break;
193:
194: default:
195: zlog_warn ("Invalid circuit state %d", old_state);
196: }
197:
198: if (isis->debugs & DEBUG_EVENTS)
199: zlog_debug ("CSM_STATE_CHANGE: %s -> %s ", STATE2STR (old_state),
200: circuit ? STATE2STR (circuit->state) : STATE2STR (C_STATE_NA));
201:
202: return circuit;
203: }
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