FreeBSD/Linux Kernel Cross Reference
sys/net/if_tun.h

     /*      $NetBSD: if_tun.h,v 1.12 2005/02/26 22:45:09 perry 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)
    
            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 */
            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_ */

Cache object: 046b6af707d1d48e289b8f67472df799