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);
tun_is_xdp_frame(void * ptr)30 static inline bool tun_is_xdp_frame(void *ptr)
31 {
32        return (unsigned long)ptr & TUN_XDP_FLAG;
33 }
tun_xdp_to_ptr(struct xdp_frame * xdp)34 static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp)
35 {
36        return (void *)((unsigned long)xdp | TUN_XDP_FLAG);
37 }
tun_ptr_to_xdp(void * ptr)38 static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr)
39 {
40        return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG);
41 }
42 void tun_ptr_free(void *ptr);
43 #else
44 #include <linux/err.h>
45 #include <linux/errno.h>
46 struct file;
47 struct socket;
tun_get_socket(struct file * f)48 static inline struct socket *tun_get_socket(struct file *f)
49 {
50 	return ERR_PTR(-EINVAL);
51 }
tun_get_tx_ring(struct file * f)52 static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
53 {
54 	return ERR_PTR(-EINVAL);
55 }
tun_is_xdp_frame(void * ptr)56 static inline bool tun_is_xdp_frame(void *ptr)
57 {
58 	return false;
59 }
tun_xdp_to_ptr(struct xdp_frame * xdp)60 static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp)
61 {
62 	return NULL;
63 }
tun_ptr_to_xdp(void * ptr)64 static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr)
65 {
66 	return NULL;
67 }
tun_ptr_free(void * ptr)68 static inline void tun_ptr_free(void *ptr)
69 {
70 }
71 #endif /* CONFIG_TUN */
72 #endif /* __IF_TUN_H */
73