/*********************************************************************
* Function: void ARPPut(NODE_INFO* more, BYTE opCode)
*
* PreCondition: None
*
* Input: remote - Remote node info
* opCode - ARP op code to send
*
* Output: TRUE - The ARP packet was generated properly
* FALSE - Unable to allocate a TX buffer
*
* Side Effects: None
*
* Overview: None
*
* Note: None
********************************************************************/
BOOL ARPPut(NODE_INFO *remote, BYTE opCode)
{
ARP_PACKET packet;
BUFFER MyTxBuffer;
MyTxBuffer = MACGetTxBuffer(TRUE);
// Do not respond if there is no room to generate the ARP reply
if(MyTxBuffer == INVALID_BUFFER)
return FALSE;
MACSetTxBuffer(MyTxBuffer, 0);
packet.HardwareType = HW_ETHERNET;
packet.Protocol = ARP_IP;
packet.MACAddrLen = sizeof(MAC_ADDR);
packet.ProtocolLen = sizeof(IP_ADDR);
if ( opCode == ARP_REQUEST )
{
packet.Operation = ARP_OPERATION_REQ;
packet.TargetMACAddr.v[0] = 0xff;
packet.TargetMACAddr.v[1] = 0xff;
packet.TargetMACAddr.v[2] = 0xff;
packet.TargetMACAddr.v[3] = 0xff;
packet.TargetMACAddr.v[4] = 0xff;
packet.TargetMACAddr.v[5] = 0xff;
}
else
{
packet.Operation = ARP_OPERATION_RESP;
packet.TargetMACAddr = remote->MACAddr;
}
packet.SenderMACAddr = AppConfig.MyMACAddr;
packet.SenderIPAddr = AppConfig.MyIPAddr;
// Check to see if target is on same subnet, if not, find Gateway MAC.
// Once we get Gateway MAC, all access to remote host will go through Gateway.
if((packet.SenderIPAddr.Val ^ remote->IPAddr.Val) & AppConfig.MyMask.Val)
{
packet.TargetIPAddr = AppConfig.MyGateway;
}
else
packet.TargetIPAddr = remote->IPAddr;
SwapARPPacket(&packet);
MACPutHeader(&packet.TargetMACAddr, MAC_ARP, sizeof(packet));
//MACPutArray((int8*)&packet, sizeof(packet));
MACPutArray(&packet, sizeof(ARP_PACKET));
MACFlush();
return TRUE;
}
/*********************************************************************
* Function: WORD IPPutHeader(NODE_INFO *remote,
* BYTE protocol,
* WORD len)
*
* PreCondition: IPIsTxReady() == TRUE
*
* Input: *remote - Destination node address
* protocol - Current packet protocol
* len - Current packet data length
*
* Output: (WORD)0
*
* Side Effects: None
*
* Note: Only one IP message can be transmitted at any
* time.
********************************************************************/
WORD IPPutHeader(NODE_INFO *remote,
BYTE protocol,
WORD len)
{
IP_HEADER header;
IPHeaderLen = sizeof(IP_HEADER);
header.VersionIHL = IP_VERSION | IP_IHL;
header.TypeOfService = IP_SERVICE;
header.TotalLength = sizeof(header) + len;
header.Identification = ++_Identifier;
header.FragmentInfo = 0;
header.TimeToLive = MY_IP_TTL;
header.Protocol = protocol;
header.HeaderChecksum = 0;
header.SourceAddress = AppConfig.MyIPAddr;
header.DestAddress.Val = remote->IPAddr.Val;
SwapIPHeader(&header);
#if defined(NON_MCHP_MAC)
header.HeaderChecksum = CalcIPChecksum((BYTE*)&header,
sizeof(header));
#endif
MACPutHeader(&remote->MACAddr, MAC_IP, (sizeof(header)+len));
MACPutArray((BYTE*)&header, sizeof(header));
#if !defined(NON_MCHP_MAC)
header.HeaderChecksum = MACCalcTxChecksum(0, sizeof(header));
MACSetTxBuffer(CurrentTxBuffer, 10); // 10 is the offset in header to the HeaderChecksum member
MACPutArray((BYTE*)&header.HeaderChecksum, 2);
MACSetTxBuffer(CurrentTxBuffer, sizeof(header)); // Seek back to the end of the packet
#endif
return 0x0;
}
