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✏️ if_tun.h

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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 *  Universal TUN/TAP device driver.
 *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 */

#ifndef __IF_TUN_H
#define __IF_TUN_H

#include <linux/types.h>
#include <linux/if_ether.h>
#include <linux/filter.h>

/* Read queue size */
#define TUN_READQ_SIZE	500
/* TUN device type flags: deprecated. Use IFF_TUN/IFF_TAP instead. */
#define TUN_TUN_DEV 	IFF_TUN
#define TUN_TAP_DEV	IFF_TAP
#define TUN_TYPE_MASK   0x000f

/* Ioctl defines */
#define TUNSETNOCSUM  _IOW('T', 200, int) 
#define TUNSETDEBUG   _IOW('T', 201, int) 
#define TUNSETIFF     _IOW('T', 202, int) 
#define TUNSETPERSIST _IOW('T', 203, int) 
#define TUNSETOWNER   _IOW('T', 204, int)
#define TUNSETLINK    _IOW('T', 205, int)
#define TUNSETGROUP   _IOW('T', 206, int)
#define TUNGETFEATURES _IOR('T', 207, unsigned int)
#define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)
#define TUNSETTXFILTER _IOW('T', 209, unsigned int)
#define TUNGETIFF      _IOR('T', 210, unsigned int)
#define TUNGETSNDBUF   _IOR('T', 211, int)
#define TUNSETSNDBUF   _IOW('T', 212, int)
#define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)
#define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)
#define TUNGETVNETHDRSZ _IOR('T', 215, int)
#define TUNSETVNETHDRSZ _IOW('T', 216, int)
#define TUNSETQUEUE  _IOW('T', 217, int)
#define TUNSETIFINDEX	_IOW('T', 218, unsigned int)
#define TUNGETFILTER _IOR('T', 219, struct sock_fprog)
#define TUNSETVNETLE _IOW('T', 220, int)
#define TUNGETVNETLE _IOR('T', 221, int)
/* The TUNSETVNETBE and TUNGETVNETBE ioctls are for cross-endian support on
 * little-endian hosts. Not all kernel configurations support them, but all
 * configurations that support SET also support GET.
 */
#define TUNSETVNETBE _IOW('T', 222, int)
#define TUNGETVNETBE _IOR('T', 223, int)
#define TUNSETSTEERINGEBPF _IOR('T', 224, int)
#define TUNSETFILTEREBPF _IOR('T', 225, int)
#define TUNSETCARRIER _IOW('T', 226, int)
#define TUNGETDEVNETNS _IO('T', 227)

/* TUNSETIFF ifr flags */
#define IFF_TUN		0x0001
#define IFF_TAP		0x0002
#define IFF_NAPI	0x0010
#define IFF_NAPI_FRAGS	0x0020
#define IFF_NO_PI	0x1000
/* This flag has no real effect */
#define IFF_ONE_QUEUE	0x2000
#define IFF_VNET_HDR	0x4000
#define IFF_TUN_EXCL	0x8000
#define IFF_MULTI_QUEUE 0x0100
#define IFF_ATTACH_QUEUE 0x0200
#define IFF_DETACH_QUEUE 0x0400
/* read-only flag */
#define IFF_PERSIST	0x0800
#define IFF_NOFILTER	0x1000

/* Socket options */
#define TUN_TX_TIMESTAMP 1

/* Features for GSO (TUNSETOFFLOAD). */
#define TUN_F_CSUM	0x01	/* You can hand me unchecksummed packets. */
#define TUN_F_TSO4	0x02	/* I can handle TSO for IPv4 packets */
#define TUN_F_TSO6	0x04	/* I can handle TSO for IPv6 packets */
#define TUN_F_TSO_ECN	0x08	/* I can handle TSO with ECN bits. */
#define TUN_F_UFO	0x10	/* I can handle UFO packets */

/* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
#define TUN_PKT_STRIP	0x0001
struct tun_pi {
	__u16  flags;
	__be16 proto;
};

/*
 * Filter spec (used for SETXXFILTER ioctls)
 * This stuff is applicable only to the TAP (Ethernet) devices.
 * If the count is zero the filter is disabled and the driver accepts
 * all packets (promisc mode).
 * If the filter is enabled in order to accept broadcast packets
 * broadcast addr must be explicitly included in the addr list.
 */
#define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
struct tun_filter {
	__u16  flags; /* TUN_FLT_ flags see above */
	__u16  count; /* Number of addresses */
	__u8   addr[0][ETH_ALEN];
};

#endif /* __IF_TUN_H */

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✏️ if_tun.h