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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; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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/include-netbsd/iso.h"
- #include "isisd/isis_constants.h"
- #include "isisd/isis_common.h"
- #include "isisd/isis_flags.h"
- #include "isisd/isis_circuit.h"
- #include "isisd/isis_tlv.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"
- 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)
- {
- zlog_err("Could not bring up %s because of invalid config.",
- circuit->interface->name);
- zlog_err("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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