1 /* 2 * Universal TUN/TAP device driver. 3 * Copyright (C) 1999-2000 Maxim Krasnyansky <[email protected]> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 #ifndef __IF_TUN_H 16 #define __IF_TUN_H 17 18 #include <uapi/linux/if_tun.h> 19 #include <uapi/linux/virtio_net.h> 20 21 #define TUN_XDP_FLAG 0x1UL 22 23 #define TUN_MSG_UBUF 1 24 #define TUN_MSG_PTR 2 25 struct tun_msg_ctl { 26 unsigned short type; 27 unsigned short num; 28 void *ptr; 29 }; 30 31 struct tun_xdp_hdr { 32 int buflen; 33 struct virtio_net_hdr gso; 34 }; 35 36 #if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE) 37 struct socket *tun_get_socket(struct file *); 38 struct ptr_ring *tun_get_tx_ring(struct file *file); 39 bool tun_is_xdp_frame(void *ptr); 40 void *tun_xdp_to_ptr(void *ptr); 41 void *tun_ptr_to_xdp(void *ptr); 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; 48 static inline struct socket *tun_get_socket(struct file *f) 49 { 50 return ERR_PTR(-EINVAL); 51 } 52 static inline struct ptr_ring *tun_get_tx_ring(struct file *f) 53 { 54 return ERR_PTR(-EINVAL); 55 } 56 static inline bool tun_is_xdp_frame(void *ptr) 57 { 58 return false; 59 } 60 static inline void *tun_xdp_to_ptr(void *ptr) 61 { 62 return NULL; 63 } 64 static inline void *tun_ptr_to_xdp(void *ptr) 65 { 66 return NULL; 67 } 68 static inline void tun_ptr_free(void *ptr) 69 { 70 } 71 #endif /* CONFIG_TUN */ 72 #endif /* __IF_TUN_H */ 73