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+/*
+ * Copyright (c) 2008-2013 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_
+
+
+
+/*
+ * 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 */
+
+/*
+ * Flags for by UTUN_OPT_FLAGS
+ */
+#define UTUN_FLAGS_NO_OUTPUT 0x0001
+#define UTUN_FLAGS_NO_INPUT 0x0002
+
+
+/*
+ * utun stats parameter structure
+ */
+struct utun_stats_param {
+ u_int64_t utsp_packets;
+ u_int64_t utsp_bytes;
+ u_int64_t utsp_errors;
+};
+
+#endif