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/isis_constants.h"
36 #include "isisd/isis_common.h"
37 #include "isisd/isis_flags.h"
38 #include "isisd/isis_circuit.h"
39 #include "isisd/isis_lsp.h"
40 #include "isisd/isis_pdu.h"
41 #include "isisd/isis_network.h"
42 #include "isisd/isis_misc.h"
43 #include "isisd/isis_constants.h"
44 #include "isisd/isis_adjacency.h"
45 #include "isisd/isis_dr.h"
46 #include "isisd/isisd.h"
47 #include "isisd/isis_csm.h"
48 #include "isisd/isis_events.h"
49 #include "isisd/isis_errors.h"
51 static const char *const csm_statestr
[] = {"C_STATE_NA", "C_STATE_INIT",
52 "C_STATE_CONF", "C_STATE_UP"};
54 #define STATE2STR(S) csm_statestr[S]
56 static const char *const csm_eventstr
[] = {
57 "NO_STATE", "ISIS_ENABLE", "IF_UP_FROM_Z",
58 "ISIS_DISABLE", "IF_DOWN_FROM_Z",
61 #define EVENT2STR(E) csm_eventstr[E]
63 struct isis_circuit
*isis_csm_state_change(enum isis_circuit_event event
,
64 struct isis_circuit
*circuit
,
67 enum isis_circuit_state old_state
;
68 struct isis
*isis
= NULL
;
69 struct isis_area
*area
= NULL
;
70 struct interface
*ifp
;
72 old_state
= circuit
? circuit
->state
: C_STATE_NA
;
74 zlog_debug("CSM_EVENT: %s", EVENT2STR(event
));
79 zlog_warn("Non-null circuit while state C_STATE_NA");
80 assert(circuit
== NULL
);
85 circuit
= isis_circuit_new(area
->isis
);
86 isis_circuit_configure(circuit
, area
);
87 circuit
->state
= C_STATE_CONF
;
91 isis
= isis_lookup_by_vrfid(ifp
->vrf_id
);
95 " %s : ISIS routing instance not found when attempting to apply against interface %s",
99 circuit
= isis_circuit_new(isis
);
100 isis_circuit_if_add(circuit
, ifp
);
101 listnode_add(isis
->init_circ_list
, circuit
);
102 circuit
->state
= C_STATE_INIT
;
107 "circuit disable event passed for a non existent circuit");
112 "circuit disconnect event passed for a non existent circuit");
120 isis_circuit_configure(circuit
,
121 (struct isis_area
*)arg
);
122 if (isis_circuit_up(circuit
) != ISIS_OK
) {
123 isis_circuit_deconfigure(
124 circuit
, (struct isis_area
*)arg
);
127 circuit
->state
= C_STATE_UP
;
128 isis_event_circuit_state_change(circuit
, circuit
->area
,
130 listnode_delete(circuit
->isis
->init_circ_list
,
135 zlog_debug("circuit %s already connected",
136 circuit
->interface
->name
);
140 zlog_debug("circuit %s already disabled",
141 circuit
->interface
->name
);
144 isis_circuit_if_del(circuit
, (struct interface
*)arg
);
145 listnode_delete(circuit
->isis
->init_circ_list
,
147 isis_circuit_del(circuit
);
157 zlog_debug("circuit %p is already enabled",
161 isis_circuit_if_add(circuit
, (struct interface
*)arg
);
162 if (isis_circuit_up(circuit
) != ISIS_OK
) {
163 isis_circuit_if_del(circuit
, (struct interface
*)arg
);
166 "Could not bring up %s because of invalid config.",
167 circuit
->interface
->name
);
170 circuit
->state
= C_STATE_UP
;
171 isis_event_circuit_state_change(circuit
, circuit
->area
,
175 isis_circuit_deconfigure(circuit
,
176 (struct isis_area
*)arg
);
177 isis_circuit_del(circuit
);
182 zlog_debug("circuit %p already disconnected",
192 zlog_debug("circuit %s already configured",
193 circuit
->interface
->name
);
197 zlog_debug("circuit %s already connected",
198 circuit
->interface
->name
);
201 isis
= circuit
->isis
;
202 isis_circuit_down(circuit
);
203 isis_circuit_deconfigure(circuit
,
204 (struct isis_area
*)arg
);
205 circuit
->state
= C_STATE_INIT
;
206 isis_event_circuit_state_change(
207 circuit
, (struct isis_area
*)arg
, 0);
208 listnode_add(isis
->init_circ_list
, circuit
);
211 isis_circuit_down(circuit
);
212 isis_circuit_if_del(circuit
, (struct interface
*)arg
);
213 circuit
->state
= C_STATE_CONF
;
214 isis_event_circuit_state_change(circuit
, circuit
->area
,
222 zlog_debug("CSM_STATE_CHANGE: %s -> %s ", STATE2STR(old_state
),
223 circuit
? STATE2STR(circuit
->state
)
224 : STATE2STR(C_STATE_NA
));