1/*	$NetBSD: if_tun.h,v 1.22 2022/03/13 21:32:43 riastradh Exp $	*/
 2
 3/*
 4 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
 5 * Nottingham University 1987.
 6 *
 7 * This source may be freely distributed, however I would be interested
 8 * in any changes that are made.
 9 *
10 * This driver takes packets off the IP i/f and hands them up to a
11 * user process to have its wicked way with. This driver has its
12 * roots in a similar driver written by Phil Cockcroft (formerly) at
13 * UCL. This driver is based much more on read/write/select mode of
14 * operation though.
15 *
16 * from: Header: if_tnreg.h,v 1.1.2.1 1992/07/16 22:39:16 friedl Exp
17 */
18
19#ifndef _NET_IF_TUN_H_
20#define _NET_IF_TUN_H_
21
22#include <sys/ioccom.h>
23
24#ifdef _KERNEL
25
26#include <sys/types.h>
27
28#include <sys/condvar.h>
29#include <sys/mutex.h>
30#include <sys/queue.h>
31#include <sys/select.h>
32
33#include <net/if.h>
34
35struct tun_softc {
36	struct	ifnet tun_if;		/* the interface */
37
38	u_short	tun_flags;		/* misc flags */
39#define	TUN_OPEN	0x0001
40#define	TUN_INITED	0x0002
41#define	TUN_RCOLL	0x0004
42#define	TUN_IASET	0x0008
43#define	TUN_DSTADDR	0x0010
44#define	TUN_UNUSED0	0x0040	/* was TUN_RWAIT */
45#define	TUN_ASYNC	0x0080
46#define	TUN_NBIO	0x0100
47#define	TUN_PREPADDR	0x0200
48#define	TUN_IFHEAD	0x0400
49
50#define	TUN_READY	(TUN_OPEN | TUN_INITED | TUN_IASET)
51
52	pid_t	tun_pgid;		/* PID or process group ID */
53	struct	selinfo	tun_rsel;	/* read select */
54	struct	selinfo	tun_wsel;	/* write select (not used) */
55	int	tun_unit;		/* the tunnel unit number */
56	kmutex_t tun_lock;		/* lock for this tunnel */
57	kcondvar_t tun_cv;		/* condition variable for tunnel */
58	LIST_ENTRY(tun_softc) tun_list;	/* list of all tuns */
59	void	*tun_osih;		/* soft interrupt handle */
60	void	*tun_isih;		/* soft interrupt handle */
61};
62#endif	/* _KERNEL */
63
64/* Maximum packet size */
65#define	TUNMTU		1500
66
67/* ioctl's for get/set debug */
68#define	TUNSDEBUG	_IOW('t', 90, int)
69#define	TUNGDEBUG	_IOR('t', 89, int)
70#define	TUNSIFMODE	_IOW('t', 88, int)
71#define	TUNSLMODE	_IOW('t', 87, int)
72#define	TUNSIFHEAD	_IOW('t', 66, int)
73#define	TUNGIFHEAD	_IOR('t', 65, int)
74
75#endif /* !_NET_IF_TUN_H_ */