LXR linux/include/linux/if

   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#ifndef __IF_TUN_H
  16#define __IF_TUN_H
  17
  18#include <uapi/linux/if_tun.h>
  19#include <uapi/linux/virtio_net.h>
  20
  21#define TUN_XDP_FLAG 0x1UL
  22
  23#define TUN_MSG_UBUF 1
  24#define TUN_MSG_PTR  2
  25struct tun_msg_ctl {
  26        unsigned short type;
  27        unsigned short num;
  28        void *ptr;
  29};
  30
  31struct tun_xdp_hdr {
  32        int buflen;
  33        struct virtio_net_hdr gso;
  34};
  35
  36#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
  37struct socket *tun_get_socket(struct file *);
  38struct ptr_ring *tun_get_tx_ring(struct file *file);
  39bool tun_is_xdp_frame(void *ptr);
  40void *tun_xdp_to_ptr(void *ptr);
  41void *tun_ptr_to_xdp(void *ptr);
  42void tun_ptr_free(void *ptr);
  43#else
  44#include <linux/err.h>
  45#include <linux/errno.h>
  46struct file;
  47struct socket;
  48static inline struct socket *tun_get_socket(struct file *f)
  49{
  50        return ERR_PTR(-EINVAL);
  51}
  52static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
  53{
  54        return ERR_PTR(-EINVAL);
  55}
  56static inline bool tun_is_xdp_frame(void *ptr)
  57{
  58        return false;
  59}
  60static inline void *tun_xdp_to_ptr(void *ptr)
  61{
  62        return NULL;
  63}
  64static inline void *tun_ptr_to_xdp(void *ptr)
  65{
  66        return NULL;
  67}
  68static inline void tun_ptr_free(void *ptr)
  69{
  70}
  71#endif /* CONFIG_TUN */
  72#endif /* __IF_TUN_H */
  73