/**
* A ICMP packet is created and put on MAC.
*
* @preCondition ICMPIsTxReady() == TRUE
*
* @param remote Remote node info
* @param code ICMP_ECHO_REPLY or ICMP_ECHO_REQUEST
* @param data Data bytes
* @param len Number of bytes to send
* @param id ICMP identifier
* @param seq ICMP sequence number
*/
void ICMPPut(NODE_INFO *remote,
ICMP_CODE code,
BYTE *data,
BYTE len,
WORD id,
WORD seq)
{
ICMP_PACKET packet;
WORD ICMPLen;
BUFFER MyTxBuffer;
MyTxBuffer = MACGetTxBuffer(TRUE);
// Abort if there is no where in the Ethernet controller to
// store this packet.
if(MyTxBuffer == INVALID_BUFFER)
return;
IPSetTxBuffer(MyTxBuffer, 0);
ICMPLen = ICMP_HEADER_SIZE + (WORD)len;
packet.Code = 0;
packet.Type = code;
packet.Checksum = 0;
packet.Identifier = id;
packet.SequenceNumber = seq;
memcpy((void*)packet.Data, (void*)data, len);
SwapICMPPacket(&packet);
#if defined(NON_MCHP_MAC) //This is NOT a Microchip MAC
packet.Checksum = CalcIPChecksum((BYTE*)&packet,
ICMPLen);
#endif
IPPutHeader(remote,
IP_PROT_ICMP,
(WORD)(ICMP_HEADER_SIZE + len));
IPPutArray((BYTE*)&packet, ICMPLen);
#if !defined(NON_MCHP_MAC) //This is a Microchip MAC
// Calculate and write the ICMP checksum using the Microchip MAC's DMA
packet.Checksum = MACCalcTxChecksum(sizeof(IP_HEADER), ICMPLen);
IPSetTxBuffer(MyTxBuffer, 2);
MACPutArray((BYTE*)&packet.Checksum, 2);
#endif
MACFlush();
}
/*********************************************************************
* 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;
}
