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