/*
 * Copyright (c) 2008-2016 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */


#ifndef	_NET_IF_UTUN_H_
#define	_NET_IF_UTUN_H_

#ifdef KERNEL_PRIVATE

#include <sys/kern_control.h>

/* Control block allocated for each kernel control connection */
struct utun_pcb {
	kern_ctl_ref	utun_ctlref;
	ifnet_t			utun_ifp;
	u_int32_t		utun_unit;
	u_int32_t		utun_flags;
	int				utun_ext_ifdata_stats;
	u_int32_t		utun_max_pending_packets;
	int       utun_channel_enabled;
	uuid_t		utun_channel_uuid;
	void *		utun_channel_rxring;
	u_int32_t	utun_channel_max_pktlen;
};

void* utun_alloc(size_t size);
void utun_free(void *ptr);
errno_t utun_register_control(void);

#endif

/*
 * Name registered by the utun kernel control
 */
#define UTUN_CONTROL_NAME "com.apple.net.utun_control"

/*
 * Socket option names to manage utun
 */
#define UTUN_OPT_FLAGS							1
#define UTUN_OPT_IFNAME							2
#define UTUN_OPT_EXT_IFDATA_STATS				3	/* get|set (type int) */
#define UTUN_OPT_INC_IFDATA_STATS_IN			4	/* set to increment stat counters (type struct utun_stats_param) */ 
#define UTUN_OPT_INC_IFDATA_STATS_OUT			5	/* set to increment stat counters (type struct utun_stats_param) */

#define UTUN_OPT_SET_DELEGATE_INTERFACE			15      /* set the delegate interface (char[]) */
#define UTUN_OPT_MAX_PENDING_PACKETS			16      /* the number of packets that can be waiting to be read
															from the control socket at a time */
#define UTUN_OPT_ENABLE_CHANNEL				17
#define UTUN_OPT_GET_CHANNEL_UUID			18
/*
 * Flags for by UTUN_OPT_FLAGS 
 */
#define	UTUN_FLAGS_NO_OUTPUT		0x0001
#define UTUN_FLAGS_NO_INPUT			0x0002
#define UTUN_FLAGS_ENABLE_PROC_UUID	0x0004

/*
 * utun stats parameter structure
 */
struct utun_stats_param {
        u_int64_t       utsp_packets;
        u_int64_t       utsp_bytes;
        u_int64_t       utsp_errors;
};

#endif
