1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Universal TUN/TAP device driver. 4 * Copyright (C) 1999-2000 Maxim Krasnyansky <[email protected]> 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 bool tun_is_xdp_frame(void *ptr); 31 void *tun_xdp_to_ptr(void *ptr); 32 void *tun_ptr_to_xdp(void *ptr); 33 void tun_ptr_free(void *ptr); 34 #else 35 #include <linux/err.h> 36 #include <linux/errno.h> 37 struct file; 38 struct socket; 39 static inline struct socket *tun_get_socket(struct file *f) 40 { 41 return ERR_PTR(-EINVAL); 42 } 43 static inline struct ptr_ring *tun_get_tx_ring(struct file *f) 44 { 45 return ERR_PTR(-EINVAL); 46 } 47 static inline bool tun_is_xdp_frame(void *ptr) 48 { 49 return false; 50 } 51 static inline void *tun_xdp_to_ptr(void *ptr) 52 { 53 return NULL; 54 } 55 static inline void *tun_ptr_to_xdp(void *ptr) 56 { 57 return NULL; 58 } 59 static inline void tun_ptr_free(void *ptr) 60 { 61 } 62 #endif /* CONFIG_TUN */ 63 #endif /* __IF_TUN_H */ 64