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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
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)
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
18 * You should have received a copy of the GNU General Public License along
19 * with this program; see the file COPYING; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
35 #include "isisd/dict.h"
36 #include "isisd/isis_constants.h"
37 #include "isisd/isis_common.h"
38 #include "isisd/isis_flags.h"
39 #include "isisd/isis_circuit.h"
40 #include "isisd/isis_lsp.h"
41 #include "isisd/isis_pdu.h"
42 #include "isisd/isis_network.h"
43 #include "isisd/isis_misc.h"
44 #include "isisd/isis_constants.h"
45 #include "isisd/isis_adjacency.h"
46 #include "isisd/isis_dr.h"
47 #include "isisd/isisd.h"
48 #include "isisd/isis_csm.h"
49 #include "isisd/isis_events.h"
50 #include "isisd/isis_errors.h"
52 extern struct isis
*isis
;
54 static const char *csm_statestr
[] = {"C_STATE_NA", "C_STATE_INIT",
55 "C_STATE_CONF", "C_STATE_UP"};
57 #define STATE2STR(S) csm_statestr[S]
59 static const char *csm_eventstr
[] = {
60 "NO_STATE", "ISIS_ENABLE", "IF_UP_FROM_Z",
61 "ISIS_DISABLE", "IF_DOWN_FROM_Z",
64 #define EVENT2STR(E) csm_eventstr[E]
67 isis_csm_state_change(int event
, struct isis_circuit
*circuit
, void *arg
)
71 old_state
= circuit
? circuit
->state
: C_STATE_NA
;
72 if (isis
->debugs
& DEBUG_EVENTS
)
73 zlog_debug("CSM_EVENT: %s", EVENT2STR(event
));
78 zlog_warn("Non-null circuit while state C_STATE_NA");
79 assert(circuit
== NULL
);
82 circuit
= isis_circuit_new();
83 isis_circuit_configure(circuit
,
84 (struct isis_area
*)arg
);
85 circuit
->state
= C_STATE_CONF
;
88 circuit
= isis_circuit_new();
89 isis_circuit_if_add(circuit
, (struct interface
*)arg
);
90 listnode_add(isis
->init_circ_list
, circuit
);
91 circuit
->state
= C_STATE_INIT
;
94 zlog_warn("circuit already disabled");
97 zlog_warn("circuit already disconnected");
105 isis_circuit_configure(circuit
,
106 (struct isis_area
*)arg
);
107 if (isis_circuit_up(circuit
) != ISIS_OK
) {
108 isis_circuit_deconfigure(
109 circuit
, (struct isis_area
*)arg
);
112 circuit
->state
= C_STATE_UP
;
113 isis_event_circuit_state_change(circuit
, circuit
->area
,
115 listnode_delete(isis
->init_circ_list
, circuit
);
119 zlog_warn("circuit already connected");
122 zlog_warn("circuit already disabled");
125 isis_circuit_if_del(circuit
, (struct interface
*)arg
);
126 listnode_delete(isis
->init_circ_list
, circuit
);
127 isis_circuit_del(circuit
);
136 zlog_warn("circuit already enabled");
139 isis_circuit_if_add(circuit
, (struct interface
*)arg
);
140 if (isis_circuit_up(circuit
) != ISIS_OK
) {
143 "Could not bring up %s because of invalid config.",
144 circuit
->interface
->name
);
147 "Clearing config for %s. Please re-examine it.",
148 circuit
->interface
->name
);
149 if (circuit
->ip_router
) {
150 circuit
->ip_router
= 0;
151 circuit
->area
->ip_circuits
--;
153 if (circuit
->ipv6_router
) {
154 circuit
->ipv6_router
= 0;
155 circuit
->area
->ipv6_circuits
--;
157 circuit_update_nlpids(circuit
);
158 isis_circuit_deconfigure(circuit
,
160 listnode_add(isis
->init_circ_list
, circuit
);
161 circuit
->state
= C_STATE_INIT
;
164 circuit
->state
= C_STATE_UP
;
165 isis_event_circuit_state_change(circuit
, circuit
->area
,
169 isis_circuit_deconfigure(circuit
,
170 (struct isis_area
*)arg
);
171 isis_circuit_del(circuit
);
175 zlog_warn("circuit already disconnected");
183 zlog_warn("circuit already configured");
186 zlog_warn("circuit already connected");
189 isis_circuit_down(circuit
);
190 isis_circuit_deconfigure(circuit
,
191 (struct isis_area
*)arg
);
192 circuit
->state
= C_STATE_INIT
;
193 isis_event_circuit_state_change(
194 circuit
, (struct isis_area
*)arg
, 0);
195 listnode_add(isis
->init_circ_list
, circuit
);
198 isis_circuit_down(circuit
);
199 isis_circuit_if_del(circuit
, (struct interface
*)arg
);
200 circuit
->state
= C_STATE_CONF
;
201 isis_event_circuit_state_change(circuit
, circuit
->area
,
208 zlog_warn("Invalid circuit state %d", old_state
);
211 if (isis
->debugs
& DEBUG_EVENTS
)
212 zlog_debug("CSM_STATE_CHANGE: %s -> %s ", STATE2STR(old_state
),
213 circuit
? STATE2STR(circuit
->state
)
214 : STATE2STR(C_STATE_NA
));