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