xref: /src/sys/net/slip.h

/*
 * Copyright (c) 1994 Christopher G. Demetriou
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 *	$Id: slip.h,v 1.4 1994/02/10 05:39:10 cgd Exp $
 */

#ifndef _NET_SLIP_H_
#define	_NET_SLIP_H_

/* ioctls operating on SLIP ttys */
#define	SLIOCGUNIT	_IOR('t', 88, int)	/* get slip unit number */

/*
 * definitions of the pseudo- link-level header attached to slip
 * packets grabbed by the packet filter (bpf) traffic monitor.
 */
#define	SLIP_HDRLEN	16		/* BPF SLIP header length */

/* offsets into BPF SLIP header */
#define	SLX_DIR		0		/* direction; see below */
#define	SLX_CHDR	1		/* compressed header data */
#define	CHDR_LEN	15		/* length of compressed header data */

#define	SLIPDIR_IN	0		/* incoming */
#define	SLIPDIR_OUT	1		/* outgoing */

#endif /* _NET_SLIP_H_ */