include/linux/if_tun.h

   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
  31 static inline bool tun_is_xdp_frame(void *ptr)
  32 {
  33         return (unsigned long)ptr & TUN_XDP_FLAG;
  34 }
  35
  36 static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp)
  37 {
  38         return (void *)((unsigned long)xdp | TUN_XDP_FLAG);
  39 }
  40
  41 static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr)
  42 {
  43         return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG);
  44 }
  45
  46 void tun_ptr_free(void *ptr);
  47 #else
  48 #include <linux/err.h>
  49 #include <linux/errno.h>
  50 struct file;
  51 struct socket;
  52
  53 static inline struct socket *tun_get_socket(struct file *f)
  54 {
  55         return ERR_PTR(-EINVAL);
  56 }
  57
  58 static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
  59 {
  60         return ERR_PTR(-EINVAL);
  61 }
  62
  63 static inline bool tun_is_xdp_frame(void *ptr)
  64 {
  65         return false;
  66 }
  67
  68 static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp)
  69 {
  70         return NULL;
  71 }
  72
  73 static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr)
  74 {
  75         return NULL;
  76 }
  77
  78 static inline void tun_ptr_free(void *ptr)
  79 {
  80 }
  81 #endif /* CONFIG_TUN */
  82 #endif /* __IF_TUN_H */