internal void OnHelloReceive(IPHeader ipHeader, OspfHeader ospfHeader, OspfHelloHeader ospfHelloHeader)
{
lock (Lock)
{
LastSeen = DateTime.Now;
Log.Write("OSPF", "NEIGHBOR", string.Format("Hello received. From: {0}, State: {1}", ospfHeader.RouterID, OspfNeighborState));
RaiseEvent(NeighborEventType.HelloReceived);
if (ospfHelloHeader.Neighbor.Any(p => p == Module.RouterID))
{
var tupleData = new Tuple<IPHeader, OspfHeader, Tuple<IPAddress, IPAddress>>(ipHeader, ospfHeader,
new Tuple<IPAddress, IPAddress>(ospfHelloHeader.Dr, ospfHelloHeader.Bdr));
RaiseEvent(NeighborEventType.TwoWayReceived, tupleData);
}
else
{
var tupleData = new Tuple<IPHeader, OspfHeader, object>(ipHeader, ospfHeader, ospfHelloHeader);
RaiseEvent(NeighborEventType.OneWayReceived, tupleData);
}
}
}
private void GetSourceAndID(OspfHeader ospfHeader, IPHeader ipHeader, out IPAddress source, out IPAddress id)
{
switch (OspfNetworkType)
{
case OspfNetworkType.PointToMultiPoint:
case OspfNetworkType.Broadcast:
case OspfNetworkType.NBMA:
source = ipHeader.SourceAddress;
id = ospfHeader.RouterID;
break;
case OspfNetworkType.VirtualLink:
source = ospfHeader.RouterID;
id = ospfHeader.RouterID;
break;
default:
case OspfNetworkType.PointToPoint:
source = ospfHeader.RouterID;
id = ipHeader.SourceAddress;
break;
}
}
internal void OnDBDReceive(IPHeader ipHeader, OspfHeader ospfHeader, Tuple<OspfDbdHeader, OspfLsaHeader[]> dbdHeaderData)
{
lock (Lock)
{
Log.Write("OSPF", "NEIGHBOR", string.Format("DBD received. From: {0}, State: {1}", ospfHeader.RouterID, OspfNeighborState));
var tupleData = new Tuple<IPHeader, OspfHeader, Tuple<OspfDbdHeader, OspfLsaHeader[]>>(ipHeader, ospfHeader, dbdHeaderData);
var ospfDBDHeader = dbdHeaderData.Item1;
var ospfLsaHeaderArray = (OspfLsaHeader[])dbdHeaderData.Item2;
switch (OspfNeighborState)
{
case OspfNeighborState.Down:
case OspfNeighborState.Attempt:
return;
case OspfNeighborState.Init:
RaiseEvent(NeighborEventType.TwoWayReceived, new Tuple<IPHeader, OspfHeader, Tuple<IPAddress, IPAddress>>(ipHeader, ospfHeader,
new Tuple<IPAddress, IPAddress>(DR, BDR)));
return;
case OspfNeighborState.TwoWay:
return;
case OspfNeighborState.ExStart:
if (ospfDBDHeader.IsInitial &&
ospfDBDHeader.HasMore &&
ospfDBDHeader.IsMaster &&
(dbdHeaderData.Item2 == null || ospfLsaHeaderArray.Length == 0) &&
ospfHeader.RouterID > Module.RouterID)
{
Log.Write("OSPF", "NEIGHBOR---------EXSTART", "IS SLAVE TO " + ospfHeader.RouterID);
LocalMSState = MasterSlaveState.Slave;
_dbdPendingAck = null;
DDSequenceNumber = ospfDBDHeader.SequenceNumber;
LastOspfDBDSeen = ospfDBDHeader;
DiscoveredOptions = ospfDBDHeader.OspfOptions;
RaiseEvent(NeighborEventType.NegotiationDone);
ProcessDBD(tupleData);
}
else if (!ospfDBDHeader.IsInitial && !ospfDBDHeader.IsMaster &&
DDSequenceNumber == dbdHeaderData.Item1.SequenceNumber &&
ospfHeader.RouterID < Module.RouterID)
{
Log.Write("OSPF", "NEIGHBOR---------EXSTART", "IS MASTER OF" + ospfHeader.RouterID);
LocalMSState = MasterSlaveState.Master;
_dbdPendingAck = null;
LastOspfDBDSeen = ospfDBDHeader;
DiscoveredOptions = ospfDBDHeader.OspfOptions;
RaiseEvent(NeighborEventType.NegotiationDone);
ProcessDBD(tupleData);
}
return;
case OspfNeighborState.Exchange:
//TODO: duplicate check?
if (dbdHeaderData.Item1.IsMaster && LocalMSState == MasterSlaveState.Master)
{
RaiseEvent(NeighborEventType.SeqNumberMismatch,
new Tuple<IPHeader, OspfHeader, Tuple<OspfDbdHeader, OspfLsaHeader[]>>(ipHeader, ospfHeader,
new Tuple<OspfDbdHeader, OspfLsaHeader[]>(ospfDBDHeader, null)));
return;
}
else if (!dbdHeaderData.Item1.IsMaster && LocalMSState == MasterSlaveState.Slave)
{
RaiseEvent(NeighborEventType.SeqNumberMismatch,
new Tuple<IPHeader, OspfHeader, Tuple<OspfDbdHeader, OspfLsaHeader[]>>(ipHeader, ospfHeader,
new Tuple<OspfDbdHeader, OspfLsaHeader[]>(ospfDBDHeader, null)));
return;
}
else if (dbdHeaderData.Item1.IsInitial)
{
RaiseEvent(NeighborEventType.SeqNumberMismatch, tupleData);
return;
}
else if (dbdHeaderData.Item1.OspfOptions != DiscoveredOptions)
{
RaiseEvent(NeighborEventType.SeqNumberMismatch, tupleData);
return;
}
else if ((LocalMSState == MasterSlaveState.Master && dbdHeaderData.Item1.SequenceNumber == DDSequenceNumber) ||
(LocalMSState == MasterSlaveState.Slave && dbdHeaderData.Item1.SequenceNumber == DDSequenceNumber + 1))
{
LastOspfDBDSeen = dbdHeaderData.Item1;
ProcessDBD(tupleData);
RaiseEvent(NeighborEventType.ExchangeDone);
return;
}
else
{
RaiseEvent(NeighborEventType.SeqNumberMismatch, tupleData);
return;
}
case OspfNeighborState.Loading:
break;
case OspfNeighborState.Full:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
}
//private void HandleHelloMessage(IPHeader ipHeader, OspfHeader ospfHeader, OspfHelloHeader ospfHelloHeader)
//{
// return;
// Neighbor neighbor = NeighborMap[ospfHeader.rid] ?? Neighbor.Create(ipHeader, ospfHeader, ospfHelloHeader);
// NeighborEventArgs args = NeighborEventArgs.Create(ipHeader, ospfHeader, ospfHelloHeader);
// neighbor.RaiseEvent(NeighborEventType.HelloReceived, args);
// if (ospfHelloHeader.neighbor.Any(p => p == RouterID))
// {
// neighbor.RaiseEvent(NeighborEventType.TwoWayReceived, args);
// }
// if (neighbor.IsNew && IsPotentialNeighbor(ipHeader, ospfHeader, ospfHelloHeader))
// {
// NeighborMap.Add(neighbor.RouterId, neighbor);
// neighbor.IsNew = false;
// }
// else
// {
// Log.Write("OSPF", "HELLO", string.Format("Incompatible OSPF hello message from .", ipHeader.saddr.StandardFormat));
// }
//}
private bool IsPotentialNeighbor(IPHeader ipHeader, OspfHeader ospfHeader, OspfHelloHeader ospfHelloHeader)
{
//if (!ospfHeader.aid.Equals(Area))
//{
// return false;
//}
//if (ospfHelloHeader.interval != HelloInterval)
//{
// return false;
//}
//if (ospfHelloHeader.routerdeadintvl != RouterDeadInterval)
//{
// return false;
//}
//if (((ospfHelloHeader.Options & OspfHelloOptions.ExternalRoutingCapable) == OspfHelloOptions.ExternalRoutingCapable) == IsStub)
//{
// return false;
//}
return true;
}