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diff --git a/sys/netgraph/ng_message.h b/sys/netgraph/ng_message.h
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+
+/*
+ * ng_message.h
+ *
+ * Copyright (c) 1996-1999 Whistle Communications, Inc.
+ * All rights reserved.
+ * 
+ * Subject to the following obligations and disclaimer of warranty, use and
+ * redistribution of this software, in source or object code forms, with or
+ * without modifications are expressly permitted by Whistle Communications;
+ * provided, however, that:
+ * 1. Any and all reproductions of the source or object code must include the
+ *    copyright notice above and the following disclaimer of warranties; and
+ * 2. No rights are granted, in any manner or form, to use Whistle
+ *    Communications, Inc. trademarks, including the mark "WHISTLE
+ *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
+ *    such appears in the above copyright notice or in the software.
+ * 
+ * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
+ * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
+ * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
+ * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+ * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
+ * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
+ * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
+ * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
+ * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
+ * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Julian Elischer <julian@whistle.com>
+ *
+ * $FreeBSD$
+ * $Whistle: ng_message.h,v 1.12 1999/01/25 01:17:44 archie Exp $
+ */
+
+#ifndef _NETGRAPH_NG_MESSAGE_H_
+#define _NETGRAPH_NG_MESSAGE_H_ 1
+
+/* ASCII string size limits */
+#define NG_TYPELEN	15	/* max type name len (16 with null) */
+#define NG_HOOKLEN	15	/* max hook name len (16 with null) */
+#define NG_NODELEN	15	/* max node name len (16 with null) */
+#define NG_PATHLEN	511	/* max path len     (512 with null) */
+#define NG_CMDSTRLEN	15	/* max command string (16 with null) */
+#define NG_TEXTRESPONSE 1024	/* allow this length for a text response */
+
+/* A netgraph message */
+struct ng_mesg {
+	struct	ng_msghdr {
+		u_char		version;		/* must == NG_VERSION */
+		u_char		spare;			/* pad to 2 bytes */
+		u_int16_t	arglen;			/* length of data */
+		u_int32_t	flags;			/* message status */
+		u_int32_t	token;			/* match with reply */
+		u_int32_t	typecookie;		/* node's type cookie */
+		u_int32_t	cmd;			/* command identifier */
+		u_char		cmdstr[NG_CMDSTRLEN+1];	/* cmd string + \0 */
+	} header;
+	char	data[0];		/* placeholder for actual data */
+};
+#define NG_VERSION 1
+#define NGF_ORIG	0x0000		/* the msg is the original request */
+#define NGF_RESP	0x0001		/* the message is a response */
+
+/*
+ * Here we describe the "generic" messages that all nodes inherently
+ * understand. With the exception of NGM_TEXT_STATUS, these are handled
+ * automatically by the base netgraph code.
+ */
+
+/* Generic message type cookie */
+#define NGM_GENERIC_COOKIE 851672668
+
+/* Generic messages defined for this type cookie */
+#define	NGM_SHUTDOWN	0x0001 	/* no args */
+#define NGM_MKPEER	0x0002
+#define NGM_CONNECT	0x0003
+#define NGM_NAME	0x0004
+#define NGM_RMHOOK	0x0005
+#define	NGM_NODEINFO	0x0006	/* get nodeinfo for the target */
+#define	NGM_LISTHOOKS	0x0007	/* get nodeinfo for the target + hook info */
+#define	NGM_LISTNAMES	0x0008	/* list all globally named nodes */
+#define	NGM_LISTNODES	0x0009	/* list all nodes, named and unnamed */
+#define	NGM_LISTTYPES	0x000a	/* list all installed node types */
+#define	NGM_TEXT_STATUS	0x000b	/* (optional) returns human readable status */
+
+/*
+ * Args sections for generic NG commands. All strings are NUL-terminated.
+ */
+struct ngm_mkpeer {
+	char	type[NG_TYPELEN + 1];			/* peer type */
+	char	ourhook[NG_HOOKLEN + 1];		/* hook name */
+	char	peerhook[NG_HOOKLEN + 1];		/* peer hook name */
+};
+
+struct ngm_connect {
+	char	path[NG_PATHLEN + 1];			/* peer path */
+	char	ourhook[NG_HOOKLEN + 1];		/* hook name */
+	char	peerhook[NG_HOOKLEN + 1];		/* peer hook name */
+};
+
+struct ngm_name {
+	char	name[NG_NODELEN + 1];			/* node name */
+};
+
+struct ngm_rmhook {
+	char	ourhook[NG_HOOKLEN + 1];		/* hook name */
+};
+
+/* Structures used in response to NGM_NODEINFO and NGM_LISTHOOKS */
+struct nodeinfo {
+	char		name[NG_NODELEN + 1];	/* node name (if any) */
+        char    	type[NG_TYPELEN + 1];   /* peer type */
+	u_int32_t	id;			/* unique identifier */
+	u_int32_t	hooks;			/* number of active hooks */
+};
+
+struct linkinfo {
+	char		ourhook[NG_HOOKLEN + 1];	/* hook name */
+	char		peerhook[NG_HOOKLEN + 1];	/* peer hook */
+	struct nodeinfo	nodeinfo;
+};
+
+struct hooklist {
+	struct nodeinfo nodeinfo;		/* node information */
+	struct linkinfo link[0];		/* info about each hook */
+};
+
+/* Structure used for NGM_LISTNAMES/NGM_LISTNODES (not node specific) */
+struct namelist {
+	u_int32_t	numnames;
+	struct nodeinfo	nodeinfo[0];
+};
+
+/* Structures used for NGM_LISTTYPES (not node specific) */
+struct typeinfo {
+	char		typename[NG_TYPELEN + 1];	/* name of type */
+	u_int32_t	numnodes;			/* number alive */
+};
+
+struct typelist {
+	u_int32_t	numtypes;
+	struct typeinfo	typeinfo[0];
+};
+
+/*
+ * For netgraph nodes that are somehow associated with file descriptors
+ * (e.g., a device that has a /dev entry and is also a netgraph node),
+ * we define a generic ioctl for requesting the corresponding nodeinfo
+ * structure and for assigning a name (if there isn't one already).
+ *
+ * For these to you need to also #include <sys/ioccom.h>.
+ */
+
+#define NGIOCGINFO	_IOR('N', 40, struct nodeinfo)	/* get node info */
+#define NGIOCSETNAME	_IOW('N', 41, struct ngm_name)	/* set node name */
+
+#ifdef KERNEL
+/*
+ * Allocate and initialize a netgraph message "msg" with "len"
+ * extra bytes of argument. Sets "msg" to NULL if fails.
+ * Does not initialize token.
+ */
+#define NG_MKMESSAGE(msg, cookie, cmdid, len, how)			\
+	do {								\
+	  MALLOC((msg), struct ng_mesg *, sizeof(struct ng_mesg)	\
+	    + (len), M_NETGRAPH, (how));				\
+	  if ((msg) == NULL)						\
+	    break;							\
+	  bzero((msg), sizeof(struct ng_mesg) + (len));			\
+	  (msg)->header.version = NG_VERSION;				\
+	  (msg)->header.typecookie = (cookie);				\
+	  (msg)->header.cmd = (cmdid);					\
+	  (msg)->header.arglen = (len);					\
+	  strncpy((msg)->header.cmdstr, #cmdid,				\
+	    sizeof((msg)->header.cmdstr) - 1);				\
+	} while (0)
+
+/*
+ * Allocate and initialize a response "rsp" to a message "msg"
+ * with "len" extra bytes of argument. Sets "rsp" to NULL if fails.
+ */
+#define NG_MKRESPONSE(rsp, msg, len, how)				\
+	do {								\
+	  MALLOC((rsp), struct ng_mesg *, sizeof(struct ng_mesg)	\
+	    + (len), M_NETGRAPH, (how));				\
+	  if ((rsp) == NULL)						\
+	    break;							\
+	  bzero((rsp), sizeof(struct ng_mesg) + (len));			\
+	  (rsp)->header.version = NG_VERSION;				\
+	  (rsp)->header.arglen = (len);					\
+	  (rsp)->header.token = (msg)->header.token;			\
+	  (rsp)->header.typecookie = (msg)->header.typecookie;		\
+	  (rsp)->header.cmd = (msg)->header.cmd;			\
+	  bcopy((msg)->header.cmdstr, (rsp)->header.cmdstr,		\
+	    sizeof((rsp)->header.cmdstr));				\
+	  (rsp)->header.flags |= NGF_RESP;				\
+	} while (0)
+#endif /* KERNEL */
+
+#endif /* _NETGRAPH_NG_MESSAGE_H_ */
+