/*	$NetBSD: if_tun.h,v 1.10 2001/10/31 20:08:17 atatat Exp $	*/

/*
 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
 * Nottingham University 1987.
 *
 * This source may be freely distributed, however I would be interested
 * in any changes that are made.
 *
 * This driver takes packets off the IP i/f and hands them up to a
 * user process to have it's wicked way with. This driver has it's
 * roots in a similar driver written by Phil Cockcroft (formerly) at
 * UCL. This driver is based much more on read/write/select mode of
 * operation though.
 * 
 * from: Header: if_tnreg.h,v 1.1.2.1 1992/07/16 22:39:16 friedl Exp
 */

#ifndef _NET_IF_TUN_H_
#define _NET_IF_TUN_H_

#ifdef _KERNEL
struct tun_softc {
	struct	ifnet tun_if;		/* the interface */

	u_short	tun_flags;		/* misc flags */
#define	TUN_OPEN	0x0001
#define	TUN_INITED	0x0002
#define	TUN_RCOLL	0x0004
#define	TUN_IASET	0x0008
#define	TUN_DSTADDR	0x0010
#define	TUN_RWAIT	0x0040
#define	TUN_ASYNC	0x0080
#define	TUN_NBIO	0x0100
#define	TUN_PREPADDR	0x0200

#define	TUN_READY	(TUN_OPEN | TUN_INITED | TUN_IASET)

	int	tun_pgrp;		/* the process group - if any */
	struct	selinfo	tun_rsel;	/* read select */
	struct	selinfo	tun_wsel;	/* write select (not used) */
	int	tun_unit;		/* the tunnel unit number */
	struct	simplelock tun_lock;	/* lock for this tunnel */
	LIST_ENTRY(tun_softc) tun_list;	/* list of all tuns */
};
#endif	/* _KERNEL */

/* Maximum packet size */
#define	TUNMTU		1500

/* ioctl's for get/set debug */
#define	TUNSDEBUG	_IOW('t', 90, int)
#define	TUNGDEBUG	_IOR('t', 89, int)
#define	TUNSIFMODE	_IOW('t', 88, int)
#define	TUNSLMODE	_IOW('t', 87, int)

#endif /* !_NET_IF_TUN_H_ */
