private void PushLabel(Package package, NhlfeEntry nhlfeEntry)
{
if (nhlfeEntry.outLabel == null)
{
Logs.ShowLog(LogType.ERROR, $"Invalid NHLFE entry for router {routerName}. outLabel null.");
return;
}
else if (nhlfeEntry.outPort == null)
{
if (nhlfeEntry.nextId == null)
{
Logs.ShowLog(LogType.ERROR, $"Invalid NHLFE entry for router {routerName}. outPort and nextId null.");
return;
}
package.labels.Add((int)nhlfeEntry.outLabel);
var nextNhlfeEntry = nhlfeTable.entries[(int)nhlfeEntry.nextId];
PushLabel(package, nextNhlfeEntry);
}
else if (nhlfeEntry.nextId == null)
{
package.labels.Add((int)nhlfeEntry.outLabel);
package.incomingPort = (int)nhlfeEntry.outPort;
// send to cloud
}
else
{
Logs.ShowLog(LogType.ERROR, $"Invalid NHLFE entry for router {routerName}. All 3 values not null.");
return;
}
}
private void PopLabel(Package package, NhlfeEntry nhlfeEntry)
{
if (nhlfeEntry.outLabel != null && nhlfeEntry.outPort != null && nhlfeEntry.nextId != null)
{
Logs.ShowLog(LogType.ERROR, $"Invalid NHLFE entry for router {routerName}. outLabel, outPort or nextId NOT null.");
return;
}
if (package.labels.Any())
{
poppedLabel = package.labels[package.labels.Count - 1];
package.labels.RemoveAt(package.labels.Count - 1);
if (package.labels.Any())
{
IlmEntry ilmEntry;
ilmEntry = ilmTable.entries[$"{package.labels.Last()}, {package.incomingPort}, {poppedLabel}"];
var newNhlfeEntry = nhlfeTable.entries[ilmEntry.id];
switch (newNhlfeEntry.operation)
{
case "PUSH":
PushLabel(package, newNhlfeEntry);
break;
case "POP":
PopLabel(package, newNhlfeEntry);
break;
case "SWAP":
SwapLabel(package, newNhlfeEntry);
break;
}
}
else
{
var mplsEntry = mplsFibTable.entries[package.destPort];
if (mplsEntry.fec == 0)
{
var ipFibEntry = ipFibTable.entries[package.destAddress];
package.incomingPort = ipFibEntry.outPort;
// send package to cloud
}
}
}
else
{
Logs.ShowLog(LogType.ERROR, "No label to pop found.");
}
}
private void SwapLabel(Package package, NhlfeEntry nhlfeEntry)
{
package.labels[package.labels.Count - 1] = (int)nhlfeEntry.outLabel;
package.incomingPort = (int)nhlfeEntry.outPort;
// send package to cloud
}