/*********************************************************************
* Function: void ICMPPut(NODE_INFO *remote,
* ICMP_CODE code,
* BYTE *data,
* BYTE len,
* WORD id,
* WORD seq)
*
* PreCondition: ICMPIsTxReady() == TRUE
*
* Input: remote - Remote node info
* code - ICMP_ECHO_REPLY or ICMP_ECHO_REQUEST
* data - Data bytes
* len - Number of bytes to send
* id - ICMP identifier
* seq - ICMP sequence number
*
* Output: None
*
* Side Effects: None
*
* Note: A ICMP packet is created and put on MAC.
*
********************************************************************/
void ICMPPut(NODE_INFO *remote,
ICMP_CODE code,
BYTE *data,
BYTE len,
WORD id,
WORD seq)
{
ICMP_PACKET packet;
packet.Code = 0;
packet.Type = code;
packet.Checksum = 0;
packet.Identifier = id;
packet.SequenceNumber = seq;
memcpy((void*)packet.Data, (void*)data, len);
SwapICMPPacket(&packet);
packet.Checksum = CalcIPChecksum((BYTE*)&packet,
(WORD)(ICMP_HEADER_SIZE + len));
IPPutHeader(remote,
IP_PROT_ICMP,
(WORD)(ICMP_HEADER_SIZE + len));
IPPutArray((BYTE*)&packet, (WORD)(ICMP_HEADER_SIZE + len));
MACFlush();
}
/*********************************************************************
* Function: LONG ICMPGetReply(void)
*
* PreCondition: ICMPBeginUsage() returned TRUE and ICMPSendPing()
* was called
*
* Input: None
*
* Output: -2: No response received yet
* -1: Operation timed out (longer than ICMP_TIMEOUT)
* has elapsed.
* >=0: Number of TICKs that elapsed between
* initial ICMP transmission and reception of
* a valid echo.
*
* Side Effects: None
*
* Overview: None
*
* Note: None
********************************************************************/
LONG ICMPGetReply(void)
{
switch(ICMPState)
{
case SM_ARP_RESOLVE:
// See if the ARP reponse was successfully received
if(ARPIsResolved(&ICMPRemote.IPAddr, &ICMPRemote.MACAddr))
{
// Position the write pointer for the next IPPutHeader operation
MACSetWritePtr(BASE_TX_ADDR + sizeof(ETHER_HEADER));
// Wait for TX hardware to become available (finish transmitting
// any previous packet)
while(!IPIsTxReady());
// Create IP header in TX memory
IPPutHeader(&ICMPRemote, IP_PROT_ICMP, sizeof(ICMP_HEADER) + 2);
MACPutArray((BYTE*)&ICMPHeader, sizeof(ICMPHeader));
MACPut(0x00); // Send two dummy bytes as ping payload
MACPut(0x00); // (needed for compatibility with some buggy NAT routers)
MACFlush();
// MAC Address resolved and echo sent, advance state
ICMPState = SM_GET_ECHO;
return -2;
}
// See if the ARP/echo request timed out
if(TickGet() - ICMPTimer > ICMP_TIMEOUT)
{
ICMPState = SM_IDLE;
return -1;
}
// No ARP response back yet
return -2;
case SM_GET_ECHO:
// See if the echo was successfully received
if(ICMPFlags.bReplyValid)
{
return (LONG)ICMPTimer;
}
// See if the ARP/echo request timed out
if(TickGet() - ICMPTimer > ICMP_TIMEOUT)
{
ICMPState = SM_IDLE;
return -1;
}
// No echo response back yet
return -2;
// SM_IDLE or illegal/impossible state:
default:
return -1;
}
}
/*********************************************************************
* Function: SHORT ICMPGetReply(void)
*
* PreCondition: ICMPBeginUsage() returned TRUE and ICMPSendPing()
* was called
*
* Input: None
*
* Output: -2: No response received yet
* -1: Operation timed out (longer than ICMP_TIMEOUT)
* has elapsed.
* >=0: Number of TICKs that elapsed between
* initial ICMP transmission and reception of
* a valid echo.
*
* Side Effects: None
*
* Overview: None
*
* Note: None
********************************************************************/
SHORT ICMPGetReply(void)
{
switch(ICMPState)
{
case SM_IDLE:
return -1;
case SM_ARP_RESOLVE:
// See if the ARP reponse was successfully received
if(ARPIsResolved(&ICMPRemote.IPAddr, &ICMPRemote.MACAddr))
{
// Position the write pointer for the next IPPutHeader operation
MACSetWritePtr(BASE_TX_ADDR + sizeof(ETHER_HEADER));
// Wait for TX hardware to become available (finish transmitting
// any previous packet)
while(!IPIsTxReady());
// Create IP header in TX memory
IPPutHeader(&ICMPRemote, IP_PROT_ICMP, sizeof(ICMP_HEADER));
MACPutArray((BYTE*)&ICMPHeader, sizeof(ICMPHeader));
MACFlush();
// MAC Address resolved and echo sent, advance state
ICMPState = SM_GET_ECHO;
return -2;
}
// See if the ARP/echo request timed out
if((WORD)TickGet() - ICMPTimer > ICMP_TIMEOUT)
{
ICMPState = SM_IDLE;
return -1;
}
// No ARP response back yet
return -2;
case SM_GET_ECHO:
// See if the echo was successfully received
if(ICMPFlags.bReplyValid)
{
return (SHORT)ICMPTimer;
}
// See if the ARP/echo request timed out
if((WORD)TickGet() - ICMPTimer > ICMP_TIMEOUT)
{
ICMPState = SM_IDLE;
return -1;
}
// No echo response back yet
return -2;
}
}
/**
* 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: BOOL UDPFlush(void)
*
* PreCondition: UDPPut() is already called and desired UDP socket
* is set as an active socket by calling
* UDPIsPutReady().
*
* Input: None
*
* Output: All and any data associated with active UDP socket
* buffer is marked as ready for transmission.
*
* Side Effects: None
*
* Overview: None
*
* Note: This function transmit all data from
* an active UDP socket.
********************************************************************/
void UDPFlush(void)
{
UDP_HEADER h;
UDP_SOCKET_INFO *p;
/*
* When using SLIP (USART), packet transmission takes some time
* and hence before sending another packet, we must make sure
* that, last packet is transmitted.
* When using ethernet controller, transmission occurs very fast
* and by the time next packet is transmitted, previous is
* transmitted and we do not need to check for last packet.
*/
//while( !IPIsTxReady() );
p = &UDPSocketInfo[activeUDPSocket];
h.SourcePort = swaps(p->localPort);
h.DestinationPort = swaps(p->remotePort);
h.Length = (WORD)((WORD)p->TxCount + (WORD)sizeof(UDP_HEADER));
// Do not swap h.Length yet. It is needed in IPPutHeader.
h.Checksum = 0x00;
IPSetTxBuffer(p->TxBuffer, 0);
/*
* Load IP header.
*/
IPPutHeader( &p->remoteNode,
IP_PROT_UDP,
h.Length );
// Now swap h.Length.
h.Length = swaps(h.Length);
/*
* Now load UDP header.
*/
IPPutArray((BYTE*)&h, sizeof(h));
/*
* Update checksum.
* TO BE IMPLEMENTED
*/
MACFlush();
p->TxBuffer = INVALID_BUFFER;
p->TxCount = 0;
}
/**
* This function transmit all data from the active UDP socket.
*
* @preCondition UDPPut() is already called and desired UDP socket
* is set as an active socket by calling
* UDPIsPutReady().
*
* @return All and any data associated with active UDP socket
* buffer is marked as ready for transmission.
*
*/
void UDPFlush(void)
{
UDP_HEADER h;
UDP_SOCKET_INFO *p;
// Wait for TX hardware to become available (finish transmitting
// any previous packet)
while( !IPIsTxReady(TRUE) ) FAST_USER_PROCESS();
p = &UDPSocketInfo[activeUDPSocket];
h.SourcePort.Val = swaps(p->localPort);
h.DestinationPort.Val = swaps(p->remotePort);
h.Length.Val = (WORD)((WORD)p->TxCount + (WORD)sizeof(UDP_HEADER));
// Do not swap h.Length yet. It is needed in IPPutHeader.
h.Checksum.Val = 0x00;
//Makes the given TX Buffer active, and set's the pointer to the first byte after the IP
//header. This is the first byte of the UDP header. The UDP header follows the IP header.
IPSetTxBuffer(p->TxBuffer, 0);
//Load IP header.
IPPutHeader( &p->remoteNode,
IP_PROT_UDP,
h.Length.Val );
//Now swap h.Length.Val
h.Length.Val = swaps(h.Length.Val);
//Now load UDP header.
IPPutArray((BYTE*)&h, sizeof(h));
//Update checksum. !!!!!!!!!!!!!!! TO BE IMPLEMENTED !!!!!!!!!!!!!!!!!!!
//Send data contained in TX Buffer via MAC
MACFlush();
// The buffer was reserved with AutoFree, so we can immediately
// discard it. The MAC layer will free it after transmission.
p->TxBuffer = INVALID_BUFFER;
p->TxCount = 0;
}
/*********************************************************************
* Function: LONG ICMPGetReply(void)
*
* PreCondition: ICMPBeginUsage() returned TRUE and ICMPSendPing()
* was called
*
* Input: None
*
* Output: -3: Could not resolve hostname (DNS timeout or
* hostname invalid)
* -2: No response received yet
* -1: Operation timed out (longer than ICMP_TIMEOUT)
* has elapsed.
* >=0: Number of TICKs that elapsed between
* initial ICMP transmission and reception of
* a valid echo.
*
* Side Effects: None
*
* Overview: None
*
* Note: None
********************************************************************/
LONG ICMPGetReply(void)
{
ICMP_PACKET ICMPPacket;
switch(ICMPState)
{
#if defined(STACK_USE_DNS)
case SM_DNS_SEND_QUERY:
// Obtain DNS module ownership
if(!DNSBeginUsage())
break;
// Send DNS query
if(ICMPFlags.bRemoteHostIsROM)
DNSResolveROM(StaticVars.RemoteHost.szROM, DNS_TYPE_A);
else
DNSResolve(StaticVars.RemoteHost.szRAM, DNS_TYPE_A);
ICMPState = SM_DNS_GET_RESPONSE;
break;
case SM_DNS_GET_RESPONSE:
// See if DNS is done, and if so, get the remote IP address
if(!DNSIsResolved(&StaticVars.ICMPRemote.IPAddr))
break;
// Free the DNS module
DNSEndUsage();
// Return error code if the DNS query failed
if(StaticVars.ICMPRemote.IPAddr.Val == 0x00000000ul)
{
ICMPState = SM_IDLE;
return -3;
}
ICMPState = SM_ARP_SEND_QUERY;
// No break;
#endif
case SM_ARP_SEND_QUERY:
ARPResolve(&StaticVars.ICMPRemote.IPAddr);
ICMPState = SM_ARP_GET_RESPONSE;
break;
case SM_ARP_GET_RESPONSE:
// See if the ARP reponse was successfully received
if(!ARPIsResolved(&StaticVars.ICMPRemote.IPAddr, &StaticVars.ICMPRemote.MACAddr))
break;
ICMPState = SM_ICMP_SEND_ECHO_REQUEST;
// No break;
case SM_ICMP_SEND_ECHO_REQUEST:
if(!IPIsTxReady())
break;
// Set up the ping packet
ICMPPacket.vType = 0x08; // 0x08: Echo (ping) request
ICMPPacket.vCode = 0x00;
ICMPPacket.wChecksum = 0x0000;
ICMPPacket.wIdentifier = 0xEFBE;
wICMPSequenceNumber++;
ICMPPacket.wSequenceNumber = wICMPSequenceNumber;
ICMPPacket.wData = 0x2860;
ICMPPacket.wChecksum = CalcIPChecksum((BYTE*)&ICMPPacket, sizeof(ICMPPacket));
// Record the current time. This will be used as a basis for
// finding the echo response time, which exludes the ARP and DNS
// steps
ICMPTimer = TickGet();
// Position the write pointer for the next IPPutHeader operation
MACSetWritePtr(BASE_TX_ADDR + sizeof(ETHER_HEADER));
// Create IP header in TX memory
IPPutHeader(&StaticVars.ICMPRemote, IP_PROT_ICMP, sizeof(ICMPPacket));
MACPutArray((BYTE*)&ICMPPacket, sizeof(ICMPPacket));
MACFlush();
// Echo sent, advance state
ICMPState = SM_ICMP_GET_ECHO_RESPONSE;
break;
case SM_ICMP_GET_ECHO_RESPONSE:
// See if the echo was successfully received
if(ICMPFlags.bReplyValid)
return (LONG)ICMPTimer;
break;
// SM_IDLE or illegal/impossible state:
default:
return -1;
}
// See if the DNS/ARP/echo request timed out
if(TickGet() - ICMPTimer > ICMP_TIMEOUT)
{
// Free DNS module if we have it in use
#if defined(STACK_USE_DNS)
if(ICMPState == SM_DNS_GET_RESPONSE)
DNSEndUsage();
#endif
// Stop ICMP echo test and return error to caller
ICMPState = SM_IDLE;
return -1;
}
// Still working. No response to report yet.
return -2;
}
/*********************************************************************
* Function: void ICMPProcess(void)
*
* PreCondition: MAC buffer contains ICMP type packet.
*
* Input: *remote: Pointer to a NODE_INFO structure of the
* ping requester
* len: Count of how many bytes the ping header and
* payload are in this IP packet
*
* Output: Generates an echo reply, if requested
* Validates and sets ICMPFlags.bReplyValid if a
* correct ping response to one of ours is received.
*
* Side Effects: None
*
* Overview: None
*
* Note: None
********************************************************************/
void ICMPProcess(NODE_INFO *remote, WORD len)
{
DWORD_VAL dwVal;
// Obtain the ICMP header Type, Code, and Checksum fields
MACGetArray((BYTE*)&dwVal, sizeof(dwVal));
// See if this is an ICMP echo (ping) request
if(dwVal.w[0] == 0x0008u)
{
// Validate the checksum using the Microchip MAC's DMA module
// The checksum data includes the precomputed checksum in the
// header, so a valid packet will always have a checksum of
// 0x0000 if the packet is not disturbed.
if(MACCalcRxChecksum(0+sizeof(IP_HEADER), len))
return;
// Calculate new Type, Code, and Checksum values
dwVal.v[0] = 0x00; // Type: 0 (ICMP echo/ping reply)
dwVal.v[2] += 8; // Subtract 0x0800 from the checksum
if(dwVal.v[2] < 8u)
{
dwVal.v[3]++;
if(dwVal.v[3] == 0u)
dwVal.v[2]++;
}
// Wait for TX hardware to become available (finish transmitting
// any previous packet)
while(!IPIsTxReady());
// Position the write pointer for the next IPPutHeader operation
// NOTE: do not put this before the IPIsTxReady() call for WF compatbility
MACSetWritePtr(BASE_TX_ADDR + sizeof(ETHER_HEADER));
// Create IP header in TX memory
IPPutHeader(remote, IP_PROT_ICMP, len);
// Copy ICMP response into the TX memory
MACPutArray((BYTE*)&dwVal, sizeof(dwVal));
MACMemCopyAsync(-1, -1, len-4);
while(!MACIsMemCopyDone());
// Transmit the echo reply packet
MACFlush();
}
#if defined(STACK_USE_ICMP_CLIENT)
else if(dwVal.w[0] == 0x0000u) // See if this an ICMP Echo reply to our request
{
// Get the sequence number and identifier fields
MACGetArray((BYTE*)&dwVal, sizeof(dwVal));
// See if the identifier matches the one we sent
if(dwVal.w[0] != 0xEFBE)
return;
if(dwVal.w[1] != wICMPSequenceNumber)
return;
// Validate the ICMP checksum field
IPSetRxBuffer(0);
if(CalcIPBufferChecksum(sizeof(ICMP_PACKET))) // Two bytes of payload were sent in the echo request
return;
// Flag that we received the response and stop the timer ticking
ICMPFlags.bReplyValid = 1;
ICMPTimer = TickGet() - ICMPTimer;
}
#endif
}
/*********************************************************************
* Function: BOOL UDPFlush(void)
*
* PreCondition: UDPPut() is already called and desired UDP socket
* is set as an active socket by calling
* UDPIsPutReady().
*
* Input: None
*
* Output: All and any data associated with active UDP socket
* buffer is marked as ready for transmission.
*
* Side Effects: None
*
* Overview: None
*
* Note: This function transmit all data from
* an active UDP socket.
********************************************************************/
void UDPFlush(void)
{
UDP_HEADER h;
UDP_SOCKET_INFO *p;
// Wait for TX hardware to become available (finish transmitting
// any previous packet)
while( !IPIsTxReady(TRUE) );
p = &UDPSocketInfo[activeUDPSocket];
debug_udp("\r\nUDP FLUSH - Sok:%U TxC:%LU SP:%LU DP:%LU ",
activeUDPSocket,
p->TxCount,
p->localPort,
p->remotePort
);
debug_udp("MAC-%X:%X:%X:%X:%X:%X",
p->remoteNode.MACAddr.v[0],
p->remoteNode.MACAddr.v[1],
p->remoteNode.MACAddr.v[2],
p->remoteNode.MACAddr.v[3],
p->remoteNode.MACAddr.v[4],
p->remoteNode.MACAddr.v[5]
);
h.SourcePort = swaps(p->localPort);
h.DestinationPort = swaps(p->remotePort);
h.Length = (WORD)((WORD)p->TxCount + (WORD)sizeof(UDP_HEADER));
// Do not swap h.Length yet. It is needed in IPPutHeader.
h.Checksum = 0x0000;
IPSetTxBuffer(p->TxBuffer, 0);
/*
* Load IP header.
*/
IPPutHeader( &p->remoteNode,
IP_PROT_UDP,
h.Length );
// Now swap h.Length.
h.Length = swaps(h.Length);
// Now load UDP header.
IPPutArray((BYTE*)&h, sizeof(h));
// Update checksum.
// TO BE IMPLEMENTED
MACFlush();
// The buffer was reserved with AutoFree, so we can immediately
// discard it. The MAC layer will free it after transmission.
p->TxBuffer = INVALID_BUFFER;
p->TxCount = 0;
}
/*****************************************************************************
Function:
void UDPFlush(void)
Summary:
Transmits all pending data in a UDP socket.
Description:
This function builds a UDP packet with the pending TX data and marks it
for transmission over the network interface. Since UDP is a frame-based
protocol, this function must be called before returning to the main
stack loop whenever any data is written.
Precondition:
UDPIsPutReady() was previously called to specify the current socket, and
data has been written to the socket using the UDPPut family of functions.
Parameters:
None
Returns:
None
Remarks:
Note that unlike TCPFlush, UDPFlush must be called before returning to
the main stack loop. There is no auto transmit for UDP segments.
***************************************************************************/
void UDPFlush(void)
{
UDP_HEADER h;
UDP_SOCKET_INFO *p;
WORD wUDPLength;
p = &UDPSocketInfo[activeUDPSocket];
wUDPLength = UDPTxCount + sizeof(UDP_HEADER);
// Generate the correct UDP header
h.SourcePort = swaps(p->localPort);
h.DestinationPort = swaps(p->remotePort);
h.Length = swaps(wUDPLength);
h.Checksum = 0x0000;
// Calculate IP pseudoheader checksum if we are going to enable
// the checksum field
#if defined(UDP_USE_TX_CHECKSUM)
{
PSEUDO_HEADER pseudoHeader;
pseudoHeader.SourceAddress = AppConfig.MyIPAddr;
pseudoHeader.DestAddress = p->remote.remoteNode.IPAddr;
pseudoHeader.Zero = 0x0;
pseudoHeader.Protocol = IP_PROT_UDP;
pseudoHeader.Length = wUDPLength;
SwapPseudoHeader(pseudoHeader);
h.Checksum = ~CalcIPChecksum((BYTE*)&pseudoHeader, sizeof(pseudoHeader));
}
#endif
// Position the hardware write pointer where we will need to
// begin writing the IP header
MACSetWritePtr(BASE_TX_ADDR + sizeof(ETHER_HEADER));
// Write IP header to packet
IPPutHeader(&p->remote.remoteNode, IP_PROT_UDP, wUDPLength);
// Write UDP header to packet
MACPutArray((BYTE*)&h, sizeof(h));
// Calculate the final UDP checksum and write it in, if enabled
#if defined(UDP_USE_TX_CHECKSUM)
{
PTR_BASE wReadPtrSave;
WORD wChecksum;
wReadPtrSave = MACSetReadPtr(BASE_TX_ADDR + sizeof(ETHER_HEADER) + sizeof(IP_HEADER));
wChecksum = CalcIPBufferChecksum(wUDPLength);
if(wChecksum == 0x0000u)
wChecksum = 0xFFFF;
MACSetReadPtr(wReadPtrSave);
MACSetWritePtr(BASE_TX_ADDR + sizeof(ETHER_HEADER) + sizeof(IP_HEADER) + 6); // 6 is the offset to the Checksum field in UDP_HEADER
MACPutArray((BYTE*)&wChecksum, sizeof(wChecksum));
}
#endif
// Transmit the packet
MACFlush();
// Reset packet size counter for the next TX operation
UDPTxCount = 0;
LastPutSocket = INVALID_UDP_SOCKET;
}
/**
* This function transmit all data from the active UDP socket.
*
* @preCondition UDPPut() is already called and desired UDP socket
* is set as an active socket by calling
* UDPIsPutReady().
*
* @return All and any data associated with active UDP socket
* buffer is marked as ready for transmission.
*
*/
void UDPFlush(void)
{
UDP_HEADER h;
UDP_SOCKET_INFO *p;
WORD csLength;
DWORD_VAL csChecksum;
// Wait for TX hardware to become available (finish transmitting
// any previous packet)
while( !IPIsTxReady(TRUE) ) FAST_USER_PROCESS();
p = &UDPSocketInfo[activeUDPSocket];
h.SourcePort.Val = swaps(p->localPort);
h.DestinationPort.Val = swaps(p->remotePort);
h.Length.Val = (WORD)((WORD)p->TxCount + (WORD)sizeof(UDP_HEADER));
// Do not swap h.Length yet. It is needed in IPPutHeader.
h.Checksum.Val = 0x00;
//Makes the given TX Buffer active, and set's the pointer to the first byte after the IP
//header. This is the first byte of the UDP header. The UDP header follows the IP header.
IPSetTxBuffer(p->TxBuffer, 0);
//Load IP header.
IPPutHeader( &p->remoteNode,
IP_PROT_UDP,
h.Length.Val );
// save length before swap for checksum calculation
csLength = p->TxCount;
//Now swap h.Length.Val
h.Length.Val = swaps(h.Length.Val);
//Now load UDP header.
IPPutArray((BYTE*)&h, sizeof(h));
//Update checksum. !!!!!!!!!!!!!!! TO BE IMPLEMENTED !!!!!!!!!!!!!!!!!!!
// Update checksum.
// start the checksum with value for UDP protocol & length from pseudo header (and in the actual packet)
csChecksum.Val = (WORD)IP_PROT_UDP + (WORD)csLength + sizeof(UDP_HEADER);
// add in my address and the remoteNode address
csChecksum.Val += ((WORD)MY_IP_BYTE1 << 8) + MY_IP_BYTE2;
csChecksum.Val += ((WORD)MY_IP_BYTE3 << 8) + MY_IP_BYTE4;
csChecksum.Val += ((WORD)p->remoteNode.IPAddr.v[0] << 8) + ((WORD)p->remoteNode.IPAddr.v[1] ) +
((WORD)p->remoteNode.IPAddr.v[2] << 8) + ((WORD)p->remoteNode.IPAddr.v[3] );
// set mac pointer to the ip_addr of the source, so all of pseudo header but length is included.
// length of pseudo header is already included in previous instruction.
//MACSetRxBuffer( sizeof(IP_HEADER)+sizeof(UDP_HEADER) );
csChecksum.Val += (WORD)p->localPort;
csChecksum.Val += (WORD)p->remotePort;
csChecksum.Val += (WORD)csLength + sizeof(UDP_HEADER);
//IPSetRxBuffer(BASE_TX_ADDR + sizeof(ETHER_HEADER) + sizeof(IP_HEADER) - ( sizeof(IP_ADDR) * 2 ) );
// handled in UdpPut routines
csChecksum.Val += udpChecksum;
// add any carry over to the last word
while((DWORD)csChecksum.word.MSW) {
csChecksum.Val = (DWORD)csChecksum.word.LSW + (DWORD)csChecksum.word.MSW;
}
// add any carry over from adding the carry over
//csChecksum.Val = (DWORD)csChecksum.word.LSW + (DWORD)csChecksum.word.MSW;
// invert
csChecksum.Val = ~csChecksum.Val;
// set write pointer to location of checksum in packet
//MACSetWritePtr( sizeof(ETHER_HEADER) + sizeof(IP_HEADER) + sizeof(UDP_HEADER) - 2 );
IPSetTxBuffer(p->TxBuffer, sizeof(UDP_HEADER) - 2);
// write the swapped checksum to the packet
//MACPut( csChecksum.v[1] );
//MACPut( csChecksum.v[0] );
MACPut(0);
MACPut(0);
//Send data contained in TX Buffer via MAC
MACFlush();
// The buffer was reserved with AutoFree, so we can immediately
// discard it. The MAC layer will free it after transmission.
p->TxBuffer = INVALID_BUFFER;
p->TxCount = 0;
}