diff --git a/core/net/mac/mac.h b/core/net/mac/mac.h
new file mode 100644
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--- /dev/null
+++ b/core/net/mac/mac.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: mac.h,v 1.1 2007/05/25 06:40:19 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         MAC driver header file
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#ifndef __MAC_H__
+#define __MAC_H__
+
+/**
+ * The structure of a device driver for a radio in Contiki.
+ */
+struct mac_driver {
+  /** Send a packet from the Rime buffer  */
+  int (* send)(void);
+
+  /** Read a received packet into the Rime buffer. */
+  int (* read)(void);
+
+  /** Set a function to be called when a packet has been received. */
+  void (* set_receive_function)(void (*f)(const struct mac_driver *d));
+
+  /** Turn the MAC layer on. */
+  int (* on)(void);
+
+  /** Turn the MAC layer off. */
+  int (* off)(void);
+};
+
+
+#endif /* __MAC_H__ */