| 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 */ |