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diff --git a/lib/lufa/Demos/Device/ClassDriver/RNDISEthernet/Lib/ARP.h b/lib/lufa/Demos/Device/ClassDriver/RNDISEthernet/Lib/ARP.h
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index 000000000..e64c38ec5
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+++ b/lib/lufa/Demos/Device/ClassDriver/RNDISEthernet/Lib/ARP.h
@@ -0,0 +1,76 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaims all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *
+ *  Header file for ARP.c.
+ */
+
+#ifndef _ARP_H_
+#define _ARP_H_
+
+	/* Includes: */
+		#include <avr/io.h>
+		#include <string.h>
+
+		#include "EthernetProtocols.h"
+		#include "Ethernet.h"
+		#include "ProtocolDecoders.h"
+
+	/* Macros: */
+		/** ARP header operation constant, indicating a request from a host for an address translation. */
+		#define ARP_OPERATION_REQUEST            1
+
+		/** ARP header operation constant, indicating a reply from a host giving an address translation. */
+		#define ARP_OPERATION_REPLY              2
+
+	/* Type Defines: */
+		/** Type define for an ARP packet inside an Ethernet frame. */
+		typedef struct
+		{
+			uint16_t      HardwareType; /**< Hardware type constant, indicating the hardware used */
+			uint16_t      ProtocolType; /**< Protocol being resolved, usually ETHERTYPE_IPV4 */
+
+			uint8_t       HLEN; /**< Length in bytes of the source/destination hardware addresses */
+			uint8_t       PLEN; /**< Length in bytes of the source/destination protocol addresses */
+			uint16_t      Operation; /**< Type of operation, either ARP_OPERATION_REQUEST or ARP_OPERATION_REPLY */
+
+			MAC_Address_t SHA; /**< Sender's hardware address */
+			IP_Address_t  SPA; /**< Sender's protocol address */
+			MAC_Address_t THA; /**< Target's hardware address */
+			IP_Address_t  TPA; /**< Target's protocol address */
+		} ARP_Header_t;
+
+	/* Function Prototypes: */
+		int16_t ARP_ProcessARPPacket(void* InDataStart,
+		                             void* OutDataStart);
+
+#endif
+