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