1/*
2 * Universal TUN/TAP device driver.
3 * Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15#ifndef __IF_TUN_H
16#define __IF_TUN_H
17
18#include <uapi/linux/if_tun.h>
19#include <uapi/linux/virtio_net.h>
20
21#define TUN_XDP_FLAG 0x1UL
22
23#define TUN_MSG_UBUF 1
24#define TUN_MSG_PTR 2
25struct tun_msg_ctl {
26 unsigned short type;
27 unsigned short num;
28 void *ptr;
29};
30
31struct tun_xdp_hdr {
32 int buflen;
33 struct virtio_net_hdr gso;
34};
35
36#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
37struct socket *tun_get_socket(struct file *);
38struct ptr_ring *tun_get_tx_ring(struct file *file);
39bool tun_is_xdp_frame(void *ptr);
40void *tun_xdp_to_ptr(void *ptr);
41void *tun_ptr_to_xdp(void *ptr);
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(void *ptr)
61{
62 return NULL;
63}
64static inline void *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