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

source code of linux/include/linux/if_tun.h