int
isis_area_destroy (const char *area_tag)
{
struct isis_area *area;
struct listnode *node, *nnode;
struct isis_circuit *circuit;
area = isis_area_lookup (area_tag);
if (area == NULL)
{
Log(LOG_WARNING, "WARN ( %s/core/ISIS ): Can't find ISIS instance %s\n", config.name, area_tag);
return TRUE;
}
if (area->circuit_list)
{
for (ALL_LIST_ELEMENTS (area->circuit_list, node, nnode, circuit))
{
/* The fact that it's in circuit_list means that it was configured */
isis_csm_state_change (ISIS_DISABLE, circuit, area);
isis_circuit_down (circuit);
isis_circuit_deconfigure (circuit, area);
}
isis_list_delete (area->circuit_list);
}
isis_listnode_delete (isis->area_list, area);
if (area->t_remove_aged)
thread_cancel (area->t_remove_aged);
THREAD_TIMER_OFF (area->spftree[0]->t_spf);
THREAD_TIMER_OFF (area->spftree[1]->t_spf);
free(area);
isis->sysid_set=0;
return FALSE;
}
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(
ISIS_ERR_CONFIG,
"Could not bring up %s because of invalid config.",
circuit->interface->name);
flog_err(
ISIS_ERR_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;
}