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      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 (at) 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 
     35 struct 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_ */
     76