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/*
* IS-IS Rout(e)ing protocol - isis_csm.c
* IS-IS circuit state machine
* Copyright (C) 2001,2002 Sampo Saaristo
* Tampere University of Technology
* Institute of Communications Engineering
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public Licenseas published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "log.h"
#include "memory.h"
#include "if.h"
#include "linklist.h"
#include "command.h"
#include "thread.h"
#include "hash.h"
#include "prefix.h"
#include "stream.h"
#include "isisd/dict.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_common.h"
#include "isisd/isis_flags.h"
#include "isisd/isis_circuit.h"
#include "isisd/isis_lsp.h"
#include "isisd/isis_pdu.h"
#include "isisd/isis_network.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_adjacency.h"
#include "isisd/isis_dr.h"
#include "isisd/isisd.h"
#include "isisd/isis_csm.h"
#include "isisd/isis_events.h"
#include "isisd/isis_errors.h"
extern struct isis *isis;
static const char *csm_statestr[] = {"C_STATE_NA", "C_STATE_INIT",
"C_STATE_CONF", "C_STATE_UP"};
#define STATE2STR(S) csm_statestr[S]
static const char *csm_eventstr[] = {
"NO_STATE", "ISIS_ENABLE", "IF_UP_FROM_Z",
"ISIS_DISABLE", "IF_DOWN_FROM_Z",
};
#define EVENT2STR(E) csm_eventstr[E]
struct isis_circuit *
isis_csm_state_change(int event, struct isis_circuit *circuit, void *arg)
{
int old_state;
old_state = circuit ? circuit->state : C_STATE_NA;
if (isis->debugs & DEBUG_EVENTS)
zlog_debug("CSM_EVENT: %s", EVENT2STR(event));
switch (old_state) {
case C_STATE_NA:
if (circuit)
zlog_warn("Non-null circuit while state C_STATE_NA");
assert(circuit == NULL);
switch (event) {
case ISIS_ENABLE:
circuit = isis_circuit_new();
isis_circuit_configure(circuit,
(struct isis_area *)arg);
circuit->state = C_STATE_CONF;
break;
case IF_UP_FROM_Z:
circuit = isis_circuit_new();
isis_circuit_if_add(circuit, (struct interface *)arg);
listnode_add(isis->init_circ_list, circuit);
circuit->state = C_STATE_INIT;
break;
case ISIS_DISABLE:
zlog_warn("circuit already disabled");
break;
case IF_DOWN_FROM_Z:
zlog_warn("circuit already disconnected");
break;
}
break;
case C_STATE_INIT:
assert(circuit);
switch (event) {
case ISIS_ENABLE:
isis_circuit_configure(circuit,
(struct isis_area *)arg);
if (isis_circuit_up(circuit) != ISIS_OK) {
isis_circuit_deconfigure(
circuit, (struct isis_area *)arg);
break;
}
circuit->state = C_STATE_UP;
isis_event_circuit_state_change(circuit, circuit->area,
1);
listnode_delete(isis->init_circ_list, circuit);
break;
case IF_UP_FROM_Z:
assert(circuit);
zlog_warn("circuit already connected");
break;
case ISIS_DISABLE:
zlog_warn("circuit already disabled");
break;
case IF_DOWN_FROM_Z:
isis_circuit_if_del(circuit, (struct interface *)arg);
listnode_delete(isis->init_circ_list, circuit);
isis_circuit_del(circuit);
circuit = NULL;
break;
}
break;
case C_STATE_CONF:
assert(circuit);
switch (event) {
case ISIS_ENABLE:
zlog_warn("circuit already enabled");
break;
case IF_UP_FROM_Z:
isis_circuit_if_add(circuit, (struct interface *)arg);
if (isis_circuit_up(circuit) != ISIS_OK) {
flog_err(
EC_ISIS_CONFIG,
"Could not bring up %s because of invalid config.",
circuit->interface->name);
flog_err(
EC_ISIS_CONFIG,
"Clearing config for %s. Please re-examine it.",
circuit->interface->name);
if (circuit->ip_router) {
circuit->ip_router = 0;
circuit->area->ip_circuits--;
}
if (circuit->ipv6_router) {
circuit->ipv6_router = 0;
circuit->area->ipv6_circuits--;
}
circuit_update_nlpids(circuit);
isis_circuit_deconfigure(circuit,
circuit->area);
listnode_add(isis->init_circ_list, circuit);
circuit->state = C_STATE_INIT;
break;
}
circuit->state = C_STATE_UP;
isis_event_circuit_state_change(circuit, circuit->area,
1);
break;
case ISIS_DISABLE:
isis_circuit_deconfigure(circuit,
(struct isis_area *)arg);
isis_circuit_del(circuit);
circuit = NULL;
break;
case IF_DOWN_FROM_Z:
zlog_warn("circuit already disconnected");
break;
}
break;
case C_STATE_UP:
assert(circuit);
switch (event) {
case ISIS_ENABLE:
zlog_warn("circuit already configured");
break;
case IF_UP_FROM_Z:
zlog_warn("circuit already connected");
break;
case ISIS_DISABLE:
isis_circuit_down(circuit);
isis_circuit_deconfigure(circuit,
(struct isis_area *)arg);
circuit->state = C_STATE_INIT;
isis_event_circuit_state_change(
circuit, (struct isis_area *)arg, 0);
listnode_add(isis->init_circ_list, circuit);
break;
case IF_DOWN_FROM_Z:
isis_circuit_down(circuit);
isis_circuit_if_del(circuit, (struct interface *)arg);
circuit->state = C_STATE_CONF;
isis_event_circuit_state_change(circuit, circuit->area,
0);
break;
}
break;
default:
zlog_warn("Invalid circuit state %d", old_state);
}
if (isis->debugs & DEBUG_EVENTS)
zlog_debug("CSM_STATE_CHANGE: %s -> %s ", STATE2STR(old_state),
circuit ? STATE2STR(circuit->state)
: STATE2STR(C_STATE_NA));
return circuit;
}
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