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 | |
31 | static inline bool tun_is_xdp_frame(void *ptr) |
32 | { |
33 | return (unsigned long)ptr & TUN_XDP_FLAG; |
34 | } |
35 | |
36 | static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp) |
37 | { |
38 | return (void *)((unsigned long)xdp | TUN_XDP_FLAG); |
39 | } |
40 | |
41 | static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr) |
42 | { |
43 | return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG); |
44 | } |
45 | |
46 | void tun_ptr_free(void *ptr); |
47 | #else |
48 | #include <linux/err.h> |
49 | #include <linux/errno.h> |
50 | struct file; |
51 | struct socket; |
52 | |
53 | static inline struct socket *tun_get_socket(struct file *f) |
54 | { |
55 | return ERR_PTR(-EINVAL); |
56 | } |
57 | |
58 | static inline struct ptr_ring *tun_get_tx_ring(struct file *f) |
59 | { |
60 | return ERR_PTR(-EINVAL); |
61 | } |
62 | |
63 | static inline bool tun_is_xdp_frame(void *ptr) |
64 | { |
65 | return false; |
66 | } |
67 | |
68 | static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp) |
69 | { |
70 | return NULL; |
71 | } |
72 | |
73 | static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr) |
74 | { |
75 | return NULL; |
76 | } |
77 | |
78 | static inline void tun_ptr_free(void *ptr) |
79 | { |
80 | } |
81 | #endif /* CONFIG_TUN */ |
82 | #endif /* __IF_TUN_H */ |
83 | |