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 16struct tun_msg_ctl { 17 unsigned short type; 18 unsigned short num; 19 void *ptr; 20}; 21 22struct tun_xdp_hdr { 23 int buflen; 24 struct virtio_net_hdr gso; 25}; 26 27#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE) 28struct socket *tun_get_socket(struct file *); 29struct ptr_ring *tun_get_tx_ring(struct file *file); 30 31static inline bool tun_is_xdp_frame(void *ptr) 32{ 33 return (unsigned long)ptr & TUN_XDP_FLAG; 34} 35 36static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp) 37{ 38 return (void *)((unsigned long)xdp | TUN_XDP_FLAG); 39} 40 41static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr) 42{ 43 return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG); 44} 45 46void tun_ptr_free(void *ptr); 47#else 48#include <linux/err.h> 49#include <linux/errno.h> 50struct file; 51struct socket; 52 53static inline struct socket *tun_get_socket(struct file *f) 54{ 55 return ERR_PTR(-EINVAL); 56} 57 58static inline struct ptr_ring *tun_get_tx_ring(struct file *f) 59{ 60 return ERR_PTR(-EINVAL); 61} 62 63static inline bool tun_is_xdp_frame(void *ptr) 64{ 65 return false; 66} 67 68static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp) 69{ 70 return NULL; 71} 72 73static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr) 74{ 75 return NULL; 76} 77 78static inline void tun_ptr_free(void *ptr) 79{ 80} 81#endif /* CONFIG_TUN */ 82#endif /* __IF_TUN_H */ 83