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 
20 #define TUN_XDP_FLAG 0x1UL
21 
22 #if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
23 struct socket *tun_get_socket(struct file *);
24 struct ptr_ring *tun_get_tx_ring(struct file *file);
25 bool tun_is_xdp_frame(void *ptr);
26 void *tun_xdp_to_ptr(void *ptr);
27 void *tun_ptr_to_xdp(void *ptr);
28 void tun_ptr_free(void *ptr);
29 #else
30 #include <linux/err.h>
31 #include <linux/errno.h>
32 struct file;
33 struct socket;
tun_get_socket(struct file * f)34 static inline struct socket *tun_get_socket(struct file *f)
35 {
36 	return ERR_PTR(-EINVAL);
37 }
tun_get_tx_ring(struct file * f)38 static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
39 {
40 	return ERR_PTR(-EINVAL);
41 }
tun_is_xdp_frame(void * ptr)42 static inline bool tun_is_xdp_frame(void *ptr)
43 {
44 	return false;
45 }
tun_xdp_to_ptr(void * ptr)46 static inline void *tun_xdp_to_ptr(void *ptr)
47 {
48 	return NULL;
49 }
tun_ptr_to_xdp(void * ptr)50 static inline void *tun_ptr_to_xdp(void *ptr)
51 {
52 	return NULL;
53 }
tun_ptr_free(void * ptr)54 static inline void tun_ptr_free(void *ptr)
55 {
56 }
57 #endif /* CONFIG_TUN */
58 #endif /* __IF_TUN_H */
59