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 tun_is_xdp_frame(void * ptr)31static inline bool tun_is_xdp_frame(void *ptr) 32 { 33 return (unsigned long)ptr & TUN_XDP_FLAG; 34 } 35 tun_xdp_to_ptr(struct xdp_frame * xdp)36static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp) 37 { 38 return (void *)((unsigned long)xdp | TUN_XDP_FLAG); 39 } 40 tun_ptr_to_xdp(void * ptr)41static 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 tun_get_socket(struct file * f)53static inline struct socket *tun_get_socket(struct file *f) 54 { 55 return ERR_PTR(-EINVAL); 56 } 57 tun_get_tx_ring(struct file * f)58static inline struct ptr_ring *tun_get_tx_ring(struct file *f) 59 { 60 return ERR_PTR(-EINVAL); 61 } 62 tun_is_xdp_frame(void * ptr)63static inline bool tun_is_xdp_frame(void *ptr) 64 { 65 return false; 66 } 67 tun_xdp_to_ptr(struct xdp_frame * xdp)68static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp) 69 { 70 return NULL; 71 } 72 tun_ptr_to_xdp(void * ptr)73static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr) 74 { 75 return NULL; 76 } 77 tun_ptr_free(void * ptr)78static inline void tun_ptr_free(void *ptr) 79 { 80 } 81 #endif /* CONFIG_TUN */ 82 #endif /* __IF_TUN_H */ 83