Adding upstream version 8.4.4.upstream/8.4.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 211 insertions, 0 deletions

diff --git a/isisd/isis_csm.c b/isisd/isis_csm.c
new file mode 100644
index 0000000..0a29dcd
--- /dev/null
+++ b/isisd/isis_csm.c
@@ -0,0 +1,211 @@
+/*
+ * 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;
+}