/// Write-only accessor to _destAddress.
/// @param newVal A stirng containing a numerical IPv4 or IPv6 address.
/// @throw InvalidIPv4Address If the IP address was not in numerical 0.0.0.0 format.
virtual void setDestAddress(const std::string& newVal) {
if (newVal.empty() || checkValidAddress(_destAddress)) _destAddress = newVal;
else throw InvalidIPv4Address("Improper IPv4 address given to devUdp4::setAddress");
_dest_addr.sin_addr.s_addr = IPv4Addr(newVal).get();
}
void IPv4::DemuxThreadFunc(void)
{
union PacketUnion
{
MaxPacket m_bytes;
unsigned int m_words[5];
IPv4Header m_header;
} *pInBE = new PacketUnion;
ASSERT(pInBE);
union {
unsigned int m_words[5];
IPv4Header m_header;
} in;
while (1)
{
m_rRecvRing.Pop(pInBE->m_bytes);
ASSERT(pInBE->m_bytes.m_startOffset == 0);
for (int count = 0; count < 5; count++)
in.m_words[count] = __builtin_bswap32(pInBE->m_words[count]);
PacketError err;
//check ipv4
if (in.m_header.m_version != 4)
continue;
//check header size
int header_size = in.m_header.m_ihl * 4;
if (header_size < 20 || header_size > 60)
continue;
//check all the sizes sum up
if (in.m_header.m_totalLength != pInBE->m_bytes.m_size)
continue;
//check checksum
pInBE->m_bytes.x[10] = 0;
pInBE->m_bytes.x[11] = 0;
unsigned short checksum = ip_checksum(&pInBE->m_header, header_size);
if (checksum != in.m_header.m_headerChecksum)
continue;
//check the destination; we have no routing
bool found = false;
for (auto it = m_localAddrs.begin(); it != m_localAddrs.end(); it++)
if (*it == in.m_header.m_destIpAddr)
{
found = true;
break;
}
if (!found)
continue;
//find a decoder for the protocol
auto it = m_protocols.find(in.m_header.m_protocol);
if (it == m_protocols.end())
continue;
Protocol *pProt = it->second;
ASSERT(pProt);
pInBE->m_bytes.m_startOffset = header_size;
err = pProt->DecodeAndDispatch(IPv4Addr(in.m_header.m_sourceIpAddr),
pInBE->m_bytes, in.m_header.m_totalLength - header_size);
if (err == kErrorOk)
continue; //no problem
it = m_protocols.find(1);
if (it == m_protocols.end())
continue; //uh-oh, no icmp
switch (err)
{
case kDestPortUnreachable:
((ICMP *)it->second)->EnqueueErrorPacket(*this, IPv4Addr(in.m_header.m_sourceIpAddr),
err, &pInBE->m_bytes.x[0], pInBE->m_bytes.m_size);
break;
default:
break;
}
}
}
