include/tun.h

   1 /*
   2  *  Universal TUN/TAP device driver.
   3  *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  *  GNU General Public License for more details.
  14  */
  15
  16 /*
  17  *  Modified for use with htun by Moshe Jacobson <moshe@runslinux.net>
  18  *  and Ola Nordström <ola@triblock.com>
  19  *
  20  *  $Id: tun.h,v 2.15 2002/04/28 05:29:07 jehsom Exp $
  21  */
  22
  23 #ifndef __IF_TUN_H
  24 #define __IF_TUN_H
  25
  26 #include <net/if.h>
  27 #include <netinet/in.h>
  28 #include "clidata.h"
  29
  30 /* Read queue size */
  31 #define TUN_READQ_SIZE  10
  32
  33 /* TUN device flags */
  34 #define TUN_TUN_DEV     0x0001
  35 #define TUN_TAP_DEV     0x0002
  36 #define TUN_TYPE_MASK   0x000f
  37
  38 #define TUN_FASYNC      0x0010
  39 #define TUN_NOCHECKSUM  0x0020
  40 #define TUN_NO_PI       0x0040
  41 #define TUN_ONE_QUEUE   0x0080
  42 #define TUN_PERSIST     0x0100
  43
  44 /* Ioctl defines */
  45 #define TUNSETNOCSUM  _IOW('T', 200, int)
  46 #define TUNSETDEBUG   _IOW('T', 201, int)
  47 #define TUNSETIFF     _IOW('T', 202, int)
  48 #define TUNSETPERSIST _IOW('T', 203, int)
  49 #define TUNSETOWNER   _IOW('T', 204, int)
  50
  51 /* TUNSETIFF ifr flags */
  52 #define IFF_TUN         0x0001
  53 #define IFF_TAP         0x0002
  54 #define IFF_NO_PI       0x1000
  55 #define IFF_ONE_QUEUE   0x2000
  56
  57 struct tun_pi {
  58         unsigned short flags;
  59         unsigned short proto;
  60 };
  61 #define TUN_PKT_STRIP   0x0001
  62
  63 /*
  64  *  * Allocates a tun device based on the input set of acceptable ip ranges.
  65  * Simply attempts to bring up the interface with successive IPs until it
  66  * succeeds. Then attempts to assign peer addresses with successive IPs until
  67  * that succeeds.  On success, returns 0 and sets the following variables:
  68  *      clidata->tunfd
  69  *      clidata->cliaddr
  70  *      clidata->srvaddr
  71  * On failure, returns -1
  72  */
  73 int srv_tun_alloc( clidata_t *clidata, clidata_list_t *clients );
  74
  75 /*
  76  * Stores the default gateway information for later undoing by
  77  * restore_default_gw().
  78  */
  79 int store_default_gw(void);
  80
  81 /*
  82  * sets routing table's default gateway to the sock peer addrress
  83  */
  84 int set_default_gw( int sockfd );
  85
  86 /*
  87  * Restores the default route to what it was before set_default_gw() was
  88  * called.
  89  */
  90 int restore_default_gw(void);
  91
  92 /*
  93  * fetches the mac addr
  94  * returns a pointer to a static buffer of the mac addr
  95  */
  96 char *get_mac( char *ifname );
  97
  98 /*
  99  * sets up the tun dev according to the specidied
 100  * local and peer ip
 101  */
 102 int cli_tun_alloc(struct in_addr local, struct in_addr peer);
 103
 104
 105 #endif /* __IF_TUN_H */