private TCP MatchTCPSession(IPv4 srcAddress, ushort srcPort,
IPv4 destAddress, ushort destPort, byte hash)
{
ChainedHashNode chainedHashNode = chainedHash[hash];
VTable.Assert(chainedHashNode != null);
TCP tcpSession = chainedHashNode.sideCache;
if ((tcpSession != null) &&
IsTCPSessionMatch(tcpSession, srcAddress, srcPort, destAddress, destPort))
{
DebugPrint("Found TCP session in cache\n");
return(tcpSession);
}
tcpSession = null;
LinkedListNode currentNode = chainedHashNode.linkedList.head;
int numMatches = 0;
while (currentNode != null)
{
TCP tmpTcpSession = currentNode.theObject as TCP;
DebugStub.Assert(tmpTcpSession != null);
VTable.Assert(tmpTcpSession != null);
numMatches++;
if (IsTCPSessionMatch(tmpTcpSession, srcAddress, srcPort, destAddress, destPort))
{
DebugPrint("Found TCP session -- {0} matches required\n", numMatches);
chainedHashNode.sideCache = tmpTcpSession;
tcpSession = tmpTcpSession;
break;
}
currentNode = currentNode.nxt;
}
return(tcpSession);
}
public LinkedListNode InsertNewSession(TCP tcpSession)
{
byte hash = Hash(tcpSession.localIPAddress, tcpSession.remoteIPAddress,
tcpSession.localPort, tcpSession.remotePort);
ChainedHashNode chainedHashNode = chainedHash[hash];
VTable.Assert(chainedHashNode != null);
//XXX check for duplicates!
return(chainedHashNode.linkedList.InsertHead(tcpSession));
}
public ChainedHash(bool activeMatch)
{
DebugPrint("New chained hash --> active {0}\n", activeMatch);
this.activeMatch = activeMatch;
chainedHashSize = defaultHashSize;
chainedHash = new ChainedHashNode[chainedHashSize];
for (int i = 0; i < chainedHashSize; i++)
{
chainedHash[i] = new ChainedHashNode();
}
}
public bool RemoveTcpSession(TCP tcpSession, LinkedListNode tcpLLNode)
//requires tcpSession.chainedHashLLNode != null;
{
byte hash = Hash(tcpSession.localIPAddress, tcpSession.remoteIPAddress,
tcpSession.localPort, tcpSession.remotePort);
ChainedHashNode chainedHashNode = chainedHash[hash];
VTable.Assert(chainedHashNode != null);
if (tcpSession == chainedHashNode.sideCache)
{
chainedHashNode.sideCache = null;
}
LinkedList linkedList = chainedHashNode.linkedList;
VTable.Assert(linkedList != null);
TCP returnedSession = linkedList.Remove(tcpLLNode) as TCP;
DebugStub.Assert(tcpSession == returnedSession);
VTable.Assert(tcpSession == returnedSession);
return(true);
}
