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diff --git a/lib/rstp-state-machines.h b/lib/rstp-state-machines.h
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+/*
+ * Copyright (c) 2011-2014 M3S, Srl - Italy
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Rapid Spanning Tree Protocol (IEEE 802.1D-2004) state machines
+ * implementation (header file).
+ *
+ * Authors:
+ *         Martino Fornasa <mf@fornasa.it>
+ *         Daniele Venturino <daniele.venturino@m3s.it>
+ *
+ * References to IEEE 802.1D-2004 standard are enclosed in square brackets.
+ * E.g. [17.3], [Table 17-1], etc.
+ *
+ */
+
+#ifndef RSTP_STATE_MACHINES_H
+#define RSTP_STATE_MACHINES_H 1
+
+#include "rstp-common.h"
+
+/* Methods called by the Forwarding Layer, through functions of rstp.h. */
+int move_rstp(struct rstp *);
+void decrease_rstp_port_timers(struct rstp *);
+void process_received_bpdu(struct rstp_port *, const void *, size_t);
+
+void updt_roles_tree(struct rstp *);
+
+#endif /* rstp-state-machines.h */