LXR linux/include/linux/if

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 *  Universal TUN/TAP device driver.
   4 *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
   5 */
   6#ifndef __IF_TUN_H
   7#define __IF_TUN_H
   8
   9#include <uapi/linux/if_tun.h>
  10#include <uapi/linux/virtio_net.h>
  11
  12#define TUN_XDP_FLAG 0x1UL
  13
  14#define TUN_MSG_UBUF 1
  15#define TUN_MSG_PTR  2
  16struct tun_msg_ctl {
  17        unsigned short type;
  18        unsigned short num;
  19        void *ptr;
  20};
  21
  22struct tun_xdp_hdr {
  23        int buflen;
  24        struct virtio_net_hdr gso;
  25};
  26
  27#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
  28struct socket *tun_get_socket(struct file *);
  29struct ptr_ring *tun_get_tx_ring(struct file *file);
  30bool tun_is_xdp_frame(void *ptr);
  31void *tun_xdp_to_ptr(void *ptr);
  32void *tun_ptr_to_xdp(void *ptr);
  33void tun_ptr_free(void *ptr);
  34#else
  35#include <linux/err.h>
  36#include <linux/errno.h>
  37struct file;
  38struct socket;
  39static inline struct socket *tun_get_socket(struct file *f)
  40{
  41        return ERR_PTR(-EINVAL);
  42}
  43static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
  44{
  45        return ERR_PTR(-EINVAL);
  46}
  47static inline bool tun_is_xdp_frame(void *ptr)
  48{
  49        return false;
  50}
  51static inline void *tun_xdp_to_ptr(void *ptr)
  52{
  53        return NULL;
  54}
  55static inline void *tun_ptr_to_xdp(void *ptr)
  56{
  57        return NULL;
  58}
  59static inline void tun_ptr_free(void *ptr)
  60{
  61}
  62#endif /* CONFIG_TUN */
  63#endif /* __IF_TUN_H */
  64