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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 */