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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/linux/if_tun.h
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@@ -1,30 +1,44 @@
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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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- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License as published by
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- *  the Free Software Foundation; either version 2 of the License, or
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- *  (at your option) any later version.
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- *
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- *  This program is distributed in the hope that it will be useful,
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- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- *  GNU General Public License for more details.
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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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+
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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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+
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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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-bool tun_is_xdp_frame(void *ptr);
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-void *tun_xdp_to_ptr(void *ptr);
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-void *tun_ptr_to_xdp(void *ptr);
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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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@@ -43,11 +57,11 @@
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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(void *ptr)
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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 void *tun_ptr_to_xdp(void *ptr)
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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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 }