| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * Universal TUN/TAP device driver. |
| * Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com> |
| */ |
| #ifndef __IF_TUN_H |
| #define __IF_TUN_H |
| |
| #include <uapi/linux/if_tun.h> |
| #include <uapi/linux/virtio_net.h> |
| |
| #define TUN_XDP_FLAG 0x1UL |
| |
| #define TUN_MSG_UBUF 1 |
| #define TUN_MSG_PTR 2 |
| struct tun_msg_ctl { |
| unsigned short type; |
| unsigned short num; |
| void *ptr; |
| }; |
| |
| struct tun_xdp_hdr { |
| int buflen; |
| struct virtio_net_hdr gso; |
| }; |
| |
| #if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE) |
| struct socket *tun_get_socket(struct file *); |
| struct ptr_ring *tun_get_tx_ring(struct file *file); |
| static inline bool tun_is_xdp_frame(void *ptr) |
| { |
| return (unsigned long)ptr & TUN_XDP_FLAG; |
| } |
| static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp) |
| { |
| return (void *)((unsigned long)xdp | TUN_XDP_FLAG); |
| } |
| static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr) |
| { |
| return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG); |
| } |
| void tun_ptr_free(void *ptr); |
| #else |
| #include <linux/err.h> |
| #include <linux/errno.h> |
| struct file; |
| struct socket; |
| static inline struct socket *tun_get_socket(struct file *f) |
| { |
| return ERR_PTR(-EINVAL); |
| } |
| static inline struct ptr_ring *tun_get_tx_ring(struct file *f) |
| { |
| return ERR_PTR(-EINVAL); |
| } |
| static inline bool tun_is_xdp_frame(void *ptr) |
| { |
| return false; |
| } |
| static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp) |
| { |
| return NULL; |
| } |
| static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr) |
| { |
| return NULL; |
| } |
| static inline void tun_ptr_free(void *ptr) |
| { |
| } |
| #endif /* CONFIG_TUN */ |
| #endif /* __IF_TUN_H */ |