/*      $NetBSD: if_tun.h,v 1.22 2022/03/13 21:32:43 riastradh 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 its wicked way with. This driver has its
 * 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_

#include <sys/ioccom.h>

#ifdef _KERNEL

#include <sys/types.h>

#include <sys/condvar.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/select.h>

#include <net/if.h>

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_UNUSED0     0x0040  /* was TUN_RWAIT */
#define TUN_ASYNC       0x0080
#define TUN_NBIO        0x0100
#define TUN_PREPADDR    0x0200
#define TUN_IFHEAD      0x0400

#define TUN_READY       (TUN_OPEN | TUN_INITED | TUN_IASET)

        pid_t   tun_pgid;               /* PID or process group ID */
        struct  selinfo tun_rsel;       /* read select */
        struct  selinfo tun_wsel;       /* write select (not used) */
        int     tun_unit;               /* the tunnel unit number */
        kmutex_t tun_lock;              /* lock for this tunnel */
        kcondvar_t tun_cv;              /* condition variable for tunnel */
        LIST_ENTRY(tun_softc) tun_list; /* list of all tuns */
        void    *tun_osih;              /* soft interrupt handle */
        void    *tun_isih;              /* soft interrupt handle */
};
#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)
#define TUNSIFHEAD      _IOW('t', 66, int)
#define TUNGIFHEAD      _IOR('t', 65, int)

#endif /* !_NET_IF_TUN_H_ */