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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/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"
static const char *const csm_statestr[] = {"C_STATE_NA", "C_STATE_INIT",
"C_STATE_CONF", "C_STATE_UP"};
#define STATE2STR(S) csm_statestr[S]
static const char *const 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(enum isis_circuit_event event,
struct isis_circuit *circuit,
void *arg)
{
enum isis_circuit_state old_state;
struct isis_area *area = NULL;
struct interface *ifp;
assert(circuit);
old_state = circuit->state;
if (IS_DEBUG_EVENTS)
zlog_debug("CSM_EVENT for %s: %s", circuit->interface->name,
EVENT2STR(event));
switch (old_state) {
case C_STATE_NA:
switch (event) {
case ISIS_ENABLE:
area = arg;
isis_circuit_configure(circuit, area);
circuit->state = C_STATE_CONF;
break;
case IF_UP_FROM_Z:
ifp = arg;
isis_circuit_if_add(circuit, ifp);
circuit->state = C_STATE_INIT;
break;
case ISIS_DISABLE:
if (IS_DEBUG_EVENTS)
zlog_debug("circuit %s already disabled",
circuit->interface->name);
break;
case IF_DOWN_FROM_Z:
if (IS_DEBUG_EVENTS)
zlog_debug("circuit %s already disconnected",
circuit->interface->name);
break;
}
break;
case C_STATE_INIT:
switch (event) {
case ISIS_ENABLE:
area = arg;
isis_circuit_configure(circuit, area);
if (isis_circuit_up(circuit) != ISIS_OK) {
isis_circuit_deconfigure(circuit, area);
break;
}
circuit->state = C_STATE_UP;
isis_event_circuit_state_change(circuit, circuit->area,
1);
break;
case IF_UP_FROM_Z:
if (IS_DEBUG_EVENTS)
zlog_debug("circuit %s already connected",
circuit->interface->name);
break;
case ISIS_DISABLE:
if (IS_DEBUG_EVENTS)
zlog_debug("circuit %s already disabled",
circuit->interface->name);
break;
case IF_DOWN_FROM_Z:
ifp = arg;
isis_circuit_if_del(circuit, ifp);
circuit->state = C_STATE_NA;
break;
}
break;
case C_STATE_CONF:
switch (event) {
case ISIS_ENABLE:
if (IS_DEBUG_EVENTS)
zlog_debug("circuit %s is already enabled",
circuit->interface->name);
break;
case IF_UP_FROM_Z:
ifp = arg;
isis_circuit_if_add(circuit, ifp);
if (isis_circuit_up(circuit) != ISIS_OK) {
isis_circuit_if_del(circuit, ifp);
flog_err(
EC_ISIS_CONFIG,
"Could not bring up %s because of invalid config.",
circuit->interface->name);
break;
}
circuit->state = C_STATE_UP;
isis_event_circuit_state_change(circuit, circuit->area,
1);
break;
case ISIS_DISABLE:
area = arg;
isis_circuit_deconfigure(circuit, area);
circuit->state = C_STATE_NA;
break;
case IF_DOWN_FROM_Z:
if (IS_DEBUG_EVENTS)
zlog_debug("circuit %s already disconnected",
circuit->interface->name);
break;
}
break;
case C_STATE_UP:
switch (event) {
case ISIS_ENABLE:
if (IS_DEBUG_EVENTS)
zlog_debug("circuit %s already enabled",
circuit->interface->name);
break;
case IF_UP_FROM_Z:
if (IS_DEBUG_EVENTS)
zlog_debug("circuit %s already connected",
circuit->interface->name);
break;
case ISIS_DISABLE:
area = arg;
isis_circuit_down(circuit);
isis_circuit_deconfigure(circuit, area);
circuit->state = C_STATE_INIT;
isis_event_circuit_state_change(circuit, area, 0);
break;
case IF_DOWN_FROM_Z:
ifp = arg;
isis_circuit_down(circuit);
isis_circuit_if_del(circuit, ifp);
circuit->state = C_STATE_CONF;
isis_event_circuit_state_change(circuit, circuit->area,
0);
break;
}
break;
}
if (IS_DEBUG_EVENTS)
zlog_debug("CSM_STATE_CHANGE: %s -> %s ", STATE2STR(old_state),
STATE2STR(circuit->state));
return circuit;
}
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