public void handlePackage(Package package)
{
NHLFE_Entry nhlfeEntry = null;
FIB_Entry fibEntry = null;
if (package.labelStack.labels.Any()) //check if stack has any elements
{
if (package.labelStack.labels.Peek().labelNumber == 0) // check if i'm last hop
{
//getting rid of all '0' labels (pushed in penultimate router)
while (package.labelStack.labels.Peek().labelNumber == 0)
{
package.labelStack.labels.Pop();
if (!package.labelStack.labels.Any())
{
break;
}
}
//if there are no labels left all tunnels are over. check fib table and return
if (!package.labelStack.labels.Any())
{
fibEntry = findFibEntry(package.DestinationAddress);
package.Port = (ushort)fibEntry.portOut;
return;
}
}
ILM_Entry ilmEntry = findIlmEntry(package.Port, package.labelStack.labels.Peek().labelNumber);
nhlfeEntry = findNhlfeEntry(ilmEntry.NHLFE_ID);
}
else
{
FEC_Entry fecEntry = findFecEntry(package.DestinationAddress);
if (fecEntry != null) //adding label
{
FTN_Entry ftnEntry = findFtnEntry(fecEntry.FEC);
nhlfeEntry = findNhlfeEntry(ftnEntry.NHLFE_ID);
}
else //forwarding by IPAddress
{
fibEntry = findFibEntry(package.DestinationAddress);
}
}
modifyPackage(package, nhlfeEntry, fibEntry);
}
public FEC_Entry findFecEntry(IPAddress destinationAddress)
{
FEC_Entry fecEntry = null;
foreach (FEC_Entry item in FEC_Table)
{
if (destinationAddress.ToString().Equals(item.destinationIP))
{
fecEntry = item;
break;
}
}
if (fecEntry == null)
{
Console.WriteLine("No fec found for IP " + destinationAddress);
}
return(fecEntry);
}
