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diff --git a/device/net_io.h b/device/net_io.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	Author: David B. Golub, Carnegie Mellon University
+ *	Date: 	ll/89
+ */
+
+#ifndef	_DEVICE_NET_IO_H_
+#define	_DEVICE_NET_IO_H_
+
+/*
+ * Utilities for playing with network messages.
+ */
+
+#include <mach/machine/vm_types.h>
+#include <ipc/ipc_kmsg.h>
+
+#include <kern/macro_help.h>
+#include <kern/lock.h>
+#include <kern/kalloc.h>
+
+#include <device/net_status.h>
+
+/*
+ * A network packet is wrapped in a kernel message while in
+ * the kernel.
+ */
+
+#define	net_kmsg(kmsg)	((net_rcv_msg_t)&(kmsg)->ikm_header)
+
+/*
+ * Interrupt routines may allocate and free net_kmsgs with these
+ * functions.  net_kmsg_get may return IKM_NULL.
+ */
+
+extern ipc_kmsg_t net_kmsg_get();
+extern void net_kmsg_put();
+
+/*
+ * Network utility routines.
+ */
+
+extern void net_packet();
+extern void net_filter();
+extern io_return_t net_getstat();
+extern io_return_t net_write();
+
+/*
+ * Non-interrupt code may allocate and free net_kmsgs with these functions.
+ */
+
+extern vm_size_t net_kmsg_size;
+
+#define net_kmsg_alloc()	((ipc_kmsg_t) kalloc(net_kmsg_size))
+#define net_kmsg_free(kmsg)	kfree((vm_offset_t) (kmsg), net_kmsg_size)
+
+#endif	_DEVICE_NET_IO_H_