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diff --git a/digital/avr/modules/usb/lufa/Demos/RNDISEthernet/ARP.c b/digital/avr/modules/usb/lufa/Demos/RNDISEthernet/ARP.c
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+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, and distribute this software
+ and its documentation for any purpose and without fee is hereby
+ granted, 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 disclaim 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
+ *
+ * Address Resolution Protocol (ARP) packet handling routines. This protocol handles the
+ * conversion of physical MAC addresses to protocol IP addresses between the host and the
+ * device.
+ */
+
+#include "ARP.h"
+
+/** Processes an ARP packet inside an Ethernet frame, and writes the appropriate response
+ * to the output Ethernet frame if the host is requesting the IP or MAC address of the
+ * virtual server device on the network.
+ *
+ * \param InDataStart Pointer to the start of the incomming packet's ARP header
+ * \param OutDataStart Pointer to the start of the outgoing packet's ARP header
+ *
+ * \return The number of bytes written to the out Ethernet frame if any, NO_RESPONSE otherwise
+ */
+int16_t ARP_ProcessARPPacket(void* InDataStart, void* OutDataStart)
+{
+ DecodeARPHeader(InDataStart);
+
+ ARP_Header_t* ARPHeaderIN = (ARP_Header_t*)InDataStart;
+ ARP_Header_t* ARPHeaderOUT = (ARP_Header_t*)OutDataStart;
+
+ /* Ensure that the ARP request is a IPv4 request packet */
+ if ((SwapEndian_16(ARPHeaderIN->ProtocolType) == ETHERTYPE_IPV4) &&
+ (SwapEndian_16(ARPHeaderIN->Operation) == ARP_OPERATION_REQUEST))
+ {
+ /* If the ARP packet is requesting the MAC or IP of the virtual webserver, return the response */
+ if (IP_COMPARE(&ARPHeaderIN->TPA, &ServerIPAddress) ||
+ MAC_COMPARE(&ARPHeaderIN->THA, &ServerMACAddress))
+ {
+ /* Fill out the ARP response header */
+ ARPHeaderOUT->HardwareType = ARPHeaderIN->HardwareType;
+ ARPHeaderOUT->ProtocolType = ARPHeaderIN->ProtocolType;
+ ARPHeaderOUT->HLEN = ARPHeaderIN->HLEN;
+ ARPHeaderOUT->PLEN = ARPHeaderIN->PLEN;
+ ARPHeaderOUT->Operation = SwapEndian_16(ARP_OPERATION_REPLY);
+
+ /* Copy over the sender MAC/IP to the target fields for the response */
+ ARPHeaderOUT->THA = ARPHeaderIN->SHA;
+ ARPHeaderOUT->TPA = ARPHeaderIN->SPA;
+
+ /* Copy over the new sender MAC/IP - MAC and IP addresses of the virtual webserver */
+ ARPHeaderOUT->SHA = ServerMACAddress;
+ ARPHeaderOUT->SPA = ServerIPAddress;
+
+ /* Return the size of the response so far */
+ return sizeof(ARP_Header_t);
+ }
+ }
+
+ return NO_RESPONSE;
+}