Cregit: Linux 6.18: if

Contributors: 9
Author	Tokens	Token Proportion	Commits	Commit Proportion
Jason (Hui) Wang	153	54.84%	5	33.33%
Michael S. Tsirkin	79	28.32%	1	6.67%
Maciej Żenczykowski	22	7.89%	2	13.33%
Linus Torvalds (pre-git)	10	3.58%	2	13.33%
Stephen Rothwell	8	2.87%	1	6.67%
Jesper Dangaard Brouer	2	0.72%	1	6.67%
Thomas Gleixner	2	0.72%	1	6.67%
Al Viro	2	0.72%	1	6.67%
David Howells	1	0.36%	1	6.67%
Total	279		15

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  Universal TUN/TAP device driver.
 *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
 */
#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;
};

#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 */