private void PerformLabelAction(MPLSPackage package, NHLFETableRow NHLFE, byte TTL, ref string poppedLabelStack)
{
if (NHLFE.OutPort != null)
{
package.Port = (ushort)NHLFE.OutPort;
}
switch (NHLFE.Action)
{
case LabelActions.POP:
if (poppedLabelStack.Equals("-"))
{
poppedLabelStack = package.PeekTopLabel().Number.ToString();
}
else
{
poppedLabelStack += "," + package.PeekTopLabel().Number.ToString();
}
AddLog($"Popped top label: {package.PeekTopLabel().Number}", LogType.Information, Window.ShowDetailedRoutingLogs);
package.PopTopLabel();
if (package.LabelStack.IsEmpty())
{
AddLog("[MPLS->IP] Copying TTL from MPLS level 1 label to IP header", LogType.Information, Window.ShowDetailedTTLLogs);
package.TTL = TTL;
}
else
{
AddLog("[MPLS] Copying TTL from the previous outermost label to the new [lower level] outermost one", LogType.Information, Window.ShowDetailedTTLLogs);
package.PeekTopLabel().TTL = TTL;
}
break;
case LabelActions.SWAP:
AddLog($"Swapped top label: {package.PeekTopLabel().Number} to {(short)NHLFE.OutLabel}", LogType.Information, Window.ShowDetailedRoutingLogs);
package.PopTopLabel();
package.PushLabel(new Label((short)NHLFE.OutLabel));
package.PeekTopLabel().TTL = TTL;
break;
case LabelActions.PUSH:
AddLog($"Pushed new label: {(short)NHLFE.OutLabel}", LogType.Information, Window.ShowDetailedRoutingLogs);
package.PushLabel(new Label((short)NHLFE.OutLabel));
if (poppedLabelStack.Equals("Push first label on IP package"))
{
AddLog("[MPLS] Copying TTL from IP header", LogType.Information, Window.ShowDetailedTTLLogs);
poppedLabelStack = "-";
}
else
{
AddLog("[MPLS] Copying TTL from the previous outermost label to the new [higher level] outermost one", LogType.Information, Window.ShowDetailedTTLLogs);
}
package.PeekTopLabel().TTL = TTL;
break;
default:
break;
}
}
private void NHLFE_AddButton_Click(object sender, RoutedEventArgs e)
{
var routerName = NHLFE_RouterName.Text;
var NHLFE_ID = NHLFE_NHLFE_ID.Text;
var action = NHLFE_Action.Text;
var outLabel = NHLFE_OutLabel.Text;
var outPort = NHLFE_OutPort.Text;
var nextID = NHLFE_NextID.Text;
if (routerName.Length == 0 || NHLFE_ID.Length == 0 || action.Length == 0 || outLabel.Length == 0 || outPort.Length == 0 || nextID.Length == 0)
{
return;
}
var isProperRule = CheckIfIsProperNHLFE_Entry(routerName, NHLFE_ID, action, outLabel, outPort, nextID);
if (!isProperRule || !Manager.RouterNameToNHLFE_Table.ContainsKey(routerName))
{
AddLog("You are trying to add an incorrect rule!", LogType.Error);
return;
}
var foundRow = NHLFE_Rows.Find(x => x.RouterName.Equals(routerName) &&
x.ID.Equals(int.Parse(NHLFE_ID)));
if (foundRow != null)
{
AddLog("NHLFE with given ID already exists!", LogType.Error);
return;
}
var rule = new NHLFETableRow(NHLFE_ID + " " + action + " " + outLabel + " " + outPort + " " + nextID);
rule.RouterName = routerName;
Manager.RouterNameToNHLFE_Table[routerName].Add(rule);
NHLFE_Rows.Add(rule);
Manager.SendRow(routerName, rule, ManagementActions.ADD_NHLFE_ENTRY);
SortNhlfeRows();
NHLFE_Table.Items.Refresh();
NHLFE_RouterName.Clear();
NHLFE_NHLFE_ID.Clear();
NHLFE_Action.Clear();
NHLFE_OutLabel.Clear();
NHLFE_OutPort.Clear();
NHLFE_NextID.Clear();
NHLFE_RouterName.Focus();
}
/// <summary>
/// Checks if two NHLFE entries are equal.
/// </summary>
/// <param name="other">An NHLFE entry we are comparing our entry to.</param>
/// <returns>True, if entries are equal; false - otherwise.</returns>
protected bool Equals(NHLFETableRow other)
{
return(ID == other.ID && Action == other.Action && OutLabel == other.OutLabel && OutPort == other.OutPort && NextID == other.NextID);
}