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/*********************************************************************
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*
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* ARP Module for Microchip TCP/IP Stack
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*
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*********************************************************************
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* FileName: ARP.c
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* Dependencies: string.h
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* stacktsk.h
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* helpers.h
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* arp.h
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* mac.h
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* Processor: PIC18
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* Complier: MCC18 v1.00.50 or higher
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* HITECH PICC-18 V8.10PL1 or higher
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* Company: Microchip Technology, Inc.
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*
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* Software License Agreement
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*
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* The software supplied herewith by Microchip Technology Incorporated
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* (the “Company”) for its PICmicro® Microcontroller is intended and
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* supplied to you, the Company’s customer, for use solely and
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* exclusively on Microchip PICmicro Microcontroller products. The
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* software is owned by the Company and/or its supplier, and is
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* protected under applicable copyright laws. All rights are reserved.
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* Any use in violation of the foregoing restrictions may subject the
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* user to criminal sanctions under applicable laws, as well as to
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* civil liability for the breach of the terms and conditions of this
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* license.
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*
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* THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
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* TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
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* IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
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* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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*
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* HiTech PICC18 Compiler Options excluding device selection:
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* -FAKELOCAL -G -Zg -E -C
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*
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* Author Date Comment
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*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* Nilesh Rajbharti 5/1/01 Original (Rev 1.0)
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* Nilesh Rajbharti 2/9/02 Cleanup
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* Nilesh Rajbharti 5/22/02 Rev 2.0 (See version.log for detail)
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********************************************************************/
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#include <string.h>
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#include "stacktsk.h"
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#include "helpers.h"
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#include "arp.h"
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#include "mac.h"
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/*
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* ARP Operation codes.
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*/
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#define ARP_OPERATION_REQ 0x01
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#define ARP_OPERATION_RESP 0x02
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/*
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* ETHERNET packet type as defined by IEEE 802.3
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*/
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#define HW_ETHERNET (0x0001)
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#define ARP_IP (0x0800)
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/*
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* ARP packet
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*/
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typedef struct _ARP_PACKET
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{
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WORD HardwareType;
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WORD Protocol;
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BYTE MACAddrLen;
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BYTE ProtocolLen;
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WORD Operation;
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MAC_ADDR SenderMACAddr;
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IP_ADDR SenderIPAddr;
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MAC_ADDR TargetMACAddr;
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IP_ADDR TargetIPAddr;
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} ARP_PACKET;
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static void SwapARPPacket(ARP_PACKET *p);
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/*********************************************************************
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* Function: BOOL ARPGet(NODE_INFO* remote, BYTE* opCode)
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*
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* PreCondition: ARP packet is ready in MAC buffer.
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*
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* Input: remote - Remote node info
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* opCode - Buffer to hold ARP op code.
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*
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* Output: TRUE if a valid ARP packet was received.
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* FALSE otherwise.
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*
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* Side Effects: None
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*
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* Overview: None
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*
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* Note: None
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********************************************************************/
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BOOL ARPGet(NODE_INFO *remote, BYTE *opCode)
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{
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ARP_PACKET packet;
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MACGetArray((BYTE*)&packet, sizeof(packet));
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MACDiscardRx();
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SwapARPPacket(&packet);
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if ( packet.HardwareType != HW_ETHERNET ||
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packet.MACAddrLen != sizeof(MAC_ADDR) ||
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packet.ProtocolLen != sizeof(IP_ADDR) )
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return FALSE;
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if ( packet.Operation == ARP_OPERATION_RESP )
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*opCode = ARP_REPLY;
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else if ( packet.Operation == ARP_OPERATION_REQ )
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*opCode = ARP_REQUEST;
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else
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{
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*opCode = ARP_UNKNOWN;
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return FALSE;
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}
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if ( (packet.TargetIPAddr.v[0] == MY_IP_BYTE1) &&
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(packet.TargetIPAddr.v[1] == MY_IP_BYTE2) &&
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(packet.TargetIPAddr.v[2] == MY_IP_BYTE3) &&
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(packet.TargetIPAddr.v[3] == MY_IP_BYTE4) )
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{
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remote->MACAddr = packet.SenderMACAddr;
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remote->IPAddr = packet.SenderIPAddr;
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return TRUE;
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}
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else
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return FALSE;
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}
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/*********************************************************************
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* Function: void ARPPut(NODE_INFO* more, BYTE opCode)
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*
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* PreCondition: MACIsTxReady() == TRUE
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*
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* Input: remote - Remote node info
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* opCode - ARP op code to send
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*
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* Output: None
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*
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* Side Effects: None
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*
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* Overview: None
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*
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* Note: None
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********************************************************************/
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void ARPPut(NODE_INFO *remote,
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BYTE opCode)
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{
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ARP_PACKET packet;
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packet.HardwareType = HW_ETHERNET;
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packet.Protocol = ARP_IP;
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packet.MACAddrLen = sizeof(MAC_ADDR);
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packet.ProtocolLen = sizeof(IP_ADDR);
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if ( opCode == ARP_REQUEST )
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{
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packet.Operation = ARP_OPERATION_REQ;
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packet.TargetMACAddr.v[0] = 0xff;
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packet.TargetMACAddr.v[1] = 0xff;
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packet.TargetMACAddr.v[2] = 0xff;
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packet.TargetMACAddr.v[3] = 0xff;
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packet.TargetMACAddr.v[4] = 0xff;
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packet.TargetMACAddr.v[5] = 0xff;
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}
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else
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{
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packet.Operation = ARP_OPERATION_RESP;
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packet.TargetMACAddr = remote->MACAddr;
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}
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packet.SenderMACAddr.v[0] = MY_MAC_BYTE1;
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packet.SenderMACAddr.v[1] = MY_MAC_BYTE2;
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packet.SenderMACAddr.v[2] = MY_MAC_BYTE3;
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packet.SenderMACAddr.v[3] = MY_MAC_BYTE4;
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packet.SenderMACAddr.v[4] = MY_MAC_BYTE5;
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packet.SenderMACAddr.v[5] = MY_MAC_BYTE6;
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packet.SenderIPAddr.v[0] = MY_IP_BYTE1;
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packet.SenderIPAddr.v[1] = MY_IP_BYTE2;
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packet.SenderIPAddr.v[2] = MY_IP_BYTE3;
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packet.SenderIPAddr.v[3] = MY_IP_BYTE4;
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/*
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* Check to see if target is on same subnet, if not, find
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* Gateway MAC.
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* Once we get Gateway MAC, all access to remote host will
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* go through Gateway.
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*/
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if (((packet.SenderIPAddr.v[0] ^ remote->IPAddr.v[0]) &
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MY_MASK_BYTE1) ||
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((packet.SenderIPAddr.v[1] ^ remote->IPAddr.v[1]) &
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MY_MASK_BYTE2) ||
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((packet.SenderIPAddr.v[2] ^ remote->IPAddr.v[2]) &
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MY_MASK_BYTE3) ||
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((packet.SenderIPAddr.v[3] ^ remote->IPAddr.v[3]) &
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MY_MASK_BYTE4) )
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{
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packet.TargetIPAddr.v[0] = MY_GATE_BYTE1;
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packet.TargetIPAddr.v[1] = MY_GATE_BYTE2;
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packet.TargetIPAddr.v[2] = MY_GATE_BYTE3;
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packet.TargetIPAddr.v[3] = MY_GATE_BYTE4;
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}
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else
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packet.TargetIPAddr = remote->IPAddr;
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SwapARPPacket(&packet);
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MACPutHeader(&packet.TargetMACAddr, MAC_ARP, sizeof(packet));
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MACPutArray((BYTE*)&packet, sizeof(packet));
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MACFlush();
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}
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/*********************************************************************
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* Function: static void SwapARPPacket(ARP_PACKET* p)
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*
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* PreCondition: None
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*
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* Input: p - ARP packet to be swapped.
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*
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* Output: None
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*
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* Side Effects: None
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*
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* Overview: None
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*
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* Note: None
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********************************************************************/
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static void SwapARPPacket(ARP_PACKET *p)
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{
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p->HardwareType = swaps(p->HardwareType);
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p->Protocol = swaps(p->Protocol);
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p->Operation = swaps(p->Operation);
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}
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