root/include/linux/if_tun.h

INCLUDED FROM

DEFINITIONS

1. tun_get_socket
2. tun_get_tx_ring
3. tun_is_xdp_frame
4. tun_xdp_to_ptr
5. tun_ptr_to_xdp
6. tun_ptr_free

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