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);
  30static inline bool tun_is_xdp_frame(void *ptr)
  31{
  32       return (unsigned long)ptr & TUN_XDP_FLAG;
  33}
  34static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp)
  35{
  36       return (void *)((unsigned long)xdp | TUN_XDP_FLAG);
  37}
  38static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr)
  39{
  40       return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG);
  41}
  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(struct xdp_frame *xdp)
  61{
  62        return NULL;
  63}
  64static inline struct xdp_frame *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