int CUDPConnection::PacketReceived (const void *pPacket, unsigned nLength, CIPAddress &rSenderIP, int nProtocol)
{
if (nProtocol != IPPROTO_UDP)
{
return 0;
}
m_Checksum.SetSourceAddress (rSenderIP);
// TODO: may not work with some UDP based protocol, would need receiver IP from network layer here
if ( m_bActiveOpen
&& m_ForeignIP.IsBroadcast ())
{
m_Checksum.SetDestinationAddress (m_ForeignIP);
}
else
{
if ( m_bActiveOpen
&& m_ForeignIP != rSenderIP)
{
return 0;
}
assert (m_pNetConfig != 0);
m_Checksum.SetDestinationAddress (*m_pNetConfig->GetIPAddress ());
}
if (nLength <= sizeof (TUDPHeader))
{
return 0;
}
TUDPHeader *pHeader = (TUDPHeader *) pPacket;
if (m_nOwnPort != be2le16 (pHeader->nDestPort))
{
return 0;
}
u16 nSourcePort = be2le16 (pHeader->nSourcePort);
if ( m_bActiveOpen
&& m_nForeignPort != nSourcePort)
{
return 0;
}
if (nLength < be2le16 (pHeader->nLength))
{
return -1;
}
if ( pHeader->nChecksum != UDP_CHECKSUM_NONE
&& m_Checksum.Calculate (pPacket, nLength) != CHECKSUM_OK)
{
return -1;
}
nLength -= sizeof (TUDPHeader);
assert (nLength > 0);
TUDPPrivateData *pData = new TUDPPrivateData;
assert (pData != 0);
rSenderIP.CopyTo (pData->SourceAddress);
pData->nSourcePort = nSourcePort;
m_RxQueue.Enqueue ((u8 *) pPacket + sizeof (TUDPHeader), nLength, pData);
return 1;
}
int CUDPConnection::PacketReceived (const void *pPacket, unsigned nLength,
CIPAddress &rSenderIP, CIPAddress &rReceiverIP, int nProtocol)
{
if (nProtocol != IPPROTO_UDP)
{
return 0;
}
if (nLength <= sizeof (TUDPHeader))
{
return -1;
}
TUDPHeader *pHeader = (TUDPHeader *) pPacket;
if (m_nOwnPort != be2le16 (pHeader->nDestPort))
{
return 0;
}
assert (m_pNetConfig != 0);
u16 nSourcePort = be2le16 (pHeader->nSourcePort);
if (m_bActiveOpen)
{
if (m_nForeignPort != nSourcePort)
{
return 0;
}
if ( m_ForeignIP != rSenderIP
&& !m_ForeignIP.IsBroadcast ()
&& m_ForeignIP != *m_pNetConfig->GetBroadcastAddress ())
{
return 0;
}
}
if (nLength < be2le16 (pHeader->nLength))
{
return -1;
}
if (pHeader->nChecksum != UDP_CHECKSUM_NONE)
{
m_Checksum.SetSourceAddress (rSenderIP);
m_Checksum.SetDestinationAddress (rReceiverIP);
if (m_Checksum.Calculate (pPacket, nLength) != CHECKSUM_OK)
{
return -1;
}
}
if ( !m_bBroadcastsAllowed
&& ( rReceiverIP.IsBroadcast ()
|| rReceiverIP == *m_pNetConfig->GetBroadcastAddress ()))
{
return 1;
}
nLength -= sizeof (TUDPHeader);
assert (nLength > 0);
TUDPPrivateData *pData = new TUDPPrivateData;
assert (pData != 0);
rSenderIP.CopyTo (pData->SourceAddress);
pData->nSourcePort = nSourcePort;
m_RxQueue.Enqueue ((u8 *) pPacket + sizeof (TUDPHeader), nLength, pData);
m_Event.Set ();
return 1;
}
