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;
tun_get_socket(struct file * f)39 static inline struct socket *tun_get_socket(struct file *f)
40 {
41 	return ERR_PTR(-EINVAL);
42 }
tun_get_tx_ring(struct file * f)43 static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
44 {
45 	return ERR_PTR(-EINVAL);
46 }
tun_is_xdp_frame(void * ptr)47 static inline bool tun_is_xdp_frame(void *ptr)
48 {
49 	return false;
50 }
tun_xdp_to_ptr(void * ptr)51 static inline void *tun_xdp_to_ptr(void *ptr)
52 {
53 	return NULL;
54 }
tun_ptr_to_xdp(void * ptr)55 static inline void *tun_ptr_to_xdp(void *ptr)
56 {
57 	return NULL;
58 }
tun_ptr_free(void * ptr)59 static inline void tun_ptr_free(void *ptr)
60 {
61 }
62 #endif /* CONFIG_TUN */
63 #endif /* __IF_TUN_H */
64