/*
   *  Universal TUN/TAP device driver.
   *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   *  GNU General Public License for more details.

   */
  
  #ifndef __IF_TUN_H
  #define __IF_TUN_H

  #include <linux/types.h>

  #include <linux/if_ether.h>

  #include <linux/filter.h>

  /* Read queue size */
  #define TUN_READQ_SIZE	500
  
  /* TUN device flags */
  #define TUN_TUN_DEV 	0x0001	
  #define TUN_TAP_DEV	0x0002
  #define TUN_TYPE_MASK   0x000f
  
  #define TUN_FASYNC	0x0010
  #define TUN_NOCHECKSUM	0x0020
  #define TUN_NO_PI	0x0040
  #define TUN_ONE_QUEUE	0x0080
  #define TUN_PERSIST 	0x0100	

  #define TUN_VNET_HDR 	0x0200

  
  /* Ioctl defines */
  #define TUNSETNOCSUM  _IOW('T', 200, int) 
  #define TUNSETDEBUG   _IOW('T', 201, int) 
  #define TUNSETIFF     _IOW('T', 202, int) 
  #define TUNSETPERSIST _IOW('T', 203, int) 
  #define TUNSETOWNER   _IOW('T', 204, int)

  #define TUNSETLINK    _IOW('T', 205, int)

  #define TUNSETGROUP   _IOW('T', 206, int)

  #define TUNGETFEATURES _IOR('T', 207, unsigned int)

  #define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)
  #define TUNSETTXFILTER _IOW('T', 209, unsigned int)

  #define TUNGETIFF      _IOR('T', 210, unsigned int)

  #define TUNGETSNDBUF   _IOR('T', 211, int)
  #define TUNSETSNDBUF   _IOW('T', 212, int)

  #define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)
  #define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)

  #define TUNGETVNETHDRSZ _IOR('T', 215, int)
  #define TUNSETVNETHDRSZ _IOW('T', 216, int)

  
  /* TUNSETIFF ifr flags */
  #define IFF_TUN		0x0001
  #define IFF_TAP		0x0002
  #define IFF_NO_PI	0x1000
  #define IFF_ONE_QUEUE	0x2000

  #define IFF_VNET_HDR	0x4000

  #define IFF_TUN_EXCL	0x8000

  /* Features for GSO (TUNSETOFFLOAD). */
  #define TUN_F_CSUM	0x01	/* You can hand me unchecksummed packets. */
  #define TUN_F_TSO4	0x02	/* I can handle TSO for IPv4 packets */
  #define TUN_F_TSO6	0x04	/* I can handle TSO for IPv6 packets */
  #define TUN_F_TSO_ECN	0x08	/* I can handle TSO with ECN bits. */

  #define TUN_F_UFO	0x10	/* I can handle UFO packets */

  /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
  #define TUN_PKT_STRIP	0x0001

  struct tun_pi {

  	__u16  flags;

  	__be16 proto;

  };

  
  /*
   * Filter spec (used for SETXXFILTER ioctls)
   * This stuff is applicable only to the TAP (Ethernet) devices.
   * If the count is zero the filter is disabled and the driver accepts
   * all packets (promisc mode).
   * If the filter is enabled in order to accept broadcast packets
   * broadcast addr must be explicitly included in the addr list.
   */
  #define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
  struct tun_filter {
  	__u16  flags; /* TUN_FLT_ flags see above */
  	__u16  count; /* Number of addresses */
  	__u8   addr[0][ETH_ALEN];
  };

  #ifdef __KERNEL__
  #if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
  struct socket *tun_get_socket(struct file *);
  #else
  #include <linux/err.h>
  #include <linux/errno.h>
  struct file;
  struct socket;
  static inline struct socket *tun_get_socket(struct file *f)
  {
  	return ERR_PTR(-EINVAL);
  }
  #endif /* CONFIG_TUN */
  #endif /* __KERNEL__ */

  #endif /* __IF_TUN_H */