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- /* SPDX-License-Identifier: GPL-2.0-or-later */
- /*
- * Universal TUN/TAP device driver.
- * Copyright (C) 1999-2000 Maxim Krasnyansky <[email protected]>
- */
- #ifndef __IF_TUN_H
- #define __IF_TUN_H
- #include <uapi/linux/if_tun.h>
- #include <uapi/linux/virtio_net.h>
- #define TUN_XDP_FLAG 0x1UL
- #define TUN_MSG_UBUF 1
- #define TUN_MSG_PTR 2
- struct tun_msg_ctl {
- unsigned short type;
- unsigned short num;
- void *ptr;
- };
- struct tun_xdp_hdr {
- int buflen;
- struct virtio_net_hdr gso;
- };
- #if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
- struct socket *tun_get_socket(struct file *);
- struct ptr_ring *tun_get_tx_ring(struct file *file);
- static inline bool tun_is_xdp_frame(void *ptr)
- {
- return (unsigned long)ptr & TUN_XDP_FLAG;
- }
- static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp)
- {
- return (void *)((unsigned long)xdp | TUN_XDP_FLAG);
- }
- static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr)
- {
- return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG);
- }
- void tun_ptr_free(void *ptr);
- #else
- #include <linux/err.h>
- #include <linux/errno.h>
- struct file;
- struct socket;
- static inline struct socket *tun_get_socket(struct file *f)
- {
- return ERR_PTR(-EINVAL);
- }
- static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
- {
- return ERR_PTR(-EINVAL);
- }
- static inline bool tun_is_xdp_frame(void *ptr)
- {
- return false;
- }
- static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp)
- {
- return NULL;
- }
- static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr)
- {
- return NULL;
- }
- static inline void tun_ptr_free(void *ptr)
- {
- }
- #endif /* CONFIG_TUN */
- #endif /* __IF_TUN_H */
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