Initial revision
diff --git a/isisd/isis_csm.c b/isisd/isis_csm.c
new file mode 100644
index 0000000..2282bbc
--- /dev/null
+++ b/isisd/isis_csm.c
@@ -0,0 +1,186 @@
+/*
+ * 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 <net/ethernet.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_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/isis_flags.h"
+#include "isisd/isisd.h"
+#include "isisd/isis_csm.h"
+#include "isisd/isis_events.h"
+
+extern struct isis *isis;
+
+static char *csm_statestr[] =
+{
+ "C_STATE_NA",
+ "C_STATE_INIT",
+ "C_STATE_CONF",
+ "C_STATE_UP"
+};
+
+#define STATE2STR(S) csm_statestr[S]
+
+static 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;
+
+ zlog_info ("CSM_EVENT: %s", EVENT2STR(event));
+
+ switch (old_state) {
+ case C_STATE_NA:
+ if (circuit)
+ zlog_warn ("Non-null circuit while state C_STATE_NA");
+ 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");
+ case IF_DOWN_FROM_Z:
+ zlog_warn ("circuit already disconnected");
+ break;
+ }
+ break;
+ case C_STATE_INIT:
+ switch (event) {
+ case ISIS_ENABLE:
+ isis_circuit_configure (circuit, (struct isis_area *)arg);
+ isis_circuit_up (circuit);
+ circuit->state = C_STATE_UP;
+ isis_event_circuit_state_change (circuit, 1);
+ listnode_delete (isis->init_circ_list, circuit);
+ break;
+ case IF_UP_FROM_Z:
+ 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);
+ listnode_delete (isis->init_circ_list, circuit);
+ isis_circuit_del (circuit);
+ break;
+ }
+ break;
+ case C_STATE_CONF:
+ switch (event) {
+ case ISIS_ENABLE:
+ zlog_warn ("circuit already enabled");
+ break;
+ case IF_UP_FROM_Z:
+ isis_circuit_if_add (circuit, (struct interface *)arg);
+ isis_circuit_up (circuit);
+ circuit->state = C_STATE_UP;
+ isis_event_circuit_state_change (circuit, 1);
+ break;
+ case ISIS_DISABLE:
+ isis_circuit_deconfigure (circuit, (struct isis_area *)arg);
+ isis_circuit_del (circuit);
+ break;
+ case IF_DOWN_FROM_Z:
+ zlog_warn ("circuit already disconnected");
+ break;
+ }
+ break;
+ case C_STATE_UP:
+ 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_deconfigure (circuit, (struct isis_area *)arg);
+ listnode_add (isis->init_circ_list, circuit);
+ circuit->state = C_STATE_INIT;
+ isis_event_circuit_state_change (circuit, 0);
+ break;
+ case IF_DOWN_FROM_Z:
+ isis_circuit_if_del (circuit);
+ circuit->state = C_STATE_CONF;
+ isis_event_circuit_state_change (circuit, 0);
+ break;
+ }
+ break;
+
+ default:
+ zlog_warn ("Invalid circuit state %d", old_state);
+ }
+
+ zlog_info ("CSM_STATE_CHANGE: %s -> %s ", STATE2STR (old_state),
+ circuit ? STATE2STR (circuit->state) : STATE2STR (C_STATE_NA));
+
+ return circuit;
+}
+
+
+