public void ReceiveFrame(EthernetFrame frame)
{
if(deviceFile == null)
{
return;
}
var bytes = frame.Bytes;
try
{
// since the file reader operations are buffered, we have to immediately flush writes
deviceFile.Write(bytes, 0, bytes.Length);
deviceFile.Flush();
}
catch(IOException)
{
if(networkInterface.OperationalStatus != OperationalStatus.Up)
{
this.DebugLog("Interface is not up during write, frame dropped.");
}
else
{
throw;
}
}
this.NoisyLog("Frame of length {0} sent to host.", frame.Length);
}
/// <summary>
/// Is invoked by the parent interface to transmit a frame to any connected endpoint.
/// </summary>
/// <param name='frame'>
/// Network frame.
/// </param>
public void TransmitFrameFromInterface(EthernetFrame frame)
{
var transmit = TransmitFromParentInterface;
if(transmit != null)
{
transmit(this, frame);
}
}
private void SendFrameToInterface(EthernetFrame frame)
{
var receive = ReceiveOnParentInterface;
if(receive != null)
{
receive(this, frame);
}
Parent.ReceiveFrame(frame);
}
void ReceiveFrameInner(EthernetFrame frame)
{
if(!frame.DestinationMAC.Value.IsBroadcast && frame.DestinationMAC.Value != MAC)
{
return;
}
lock(packetQueue)
{
packetQueue.Enqueue(frame);
SignalInterrupt();
}
}
public void ReceiveFrame(EthernetFrame frame)
{
// TODO: non blocking
if(stream == null)
{
return;
}
var handle = GCHandle.Alloc(frame.Bytes, GCHandleType.Pinned);
try
{
var result = LibC.WriteData(stream.Handle, handle.AddrOfPinnedObject(), frame.Length);
if(result == 0)
{
this.Log(LogLevel.Error,
"Error while writing to TUN interface: {0}.", result);
}
}
finally
{
handle.Free();
}
}
private async Task ReadPacketAsync()
{
var buffer = new byte[Mtu];
while(!cts.IsCancellationRequested)
{
try
{
if(await deviceFile.ReadAsync(buffer, 0, buffer.Length, cts.Token) > 0)
{
var frame = new EthernetFrame(buffer, true);
Link.TransmitFrameFromInterface(frame);
this.NoisyLog("Frame of length {0} received from host.", frame.Length);
}
}
catch(IOException)
{
if(networkInterface.OperationalStatus != OperationalStatus.Up)
{
this.NoisyLog("I/O exception while interface is not up, waiting {0}s.", Misc.NormalizeDecimal(GracePeriod.TotalSeconds));
// probably the interface is not opened yet
await Task.Delay(GracePeriod);
}
else
{
throw;
}
}
}
}
private void ReceiveFrameInner(EthernetFrame frame)
{
lock(sync)
{
this.Log(LogLevel.Noisy, "Received packet len {0}", frame.Length);
if((registers.Control & (1u << 2)) == 0)
{
this.Log(LogLevel.Debug, "Receiver not enabled, dropping frame.");
return;
}
bool interrupt = false;
rxBufferDescriptor rxBD = new rxBufferDescriptor(machine.SystemBus);
rxBD.Fetch(registers.RxQueueBaseAddr);
if(!rxBD.Ownership)//if we could write data to this BD
{
interrupt = false;
rxBD.Ownership = true;
rxBD.StartOfFrame = true;
rxBD.EndOfFrame = true;
rxBD.Length = (ushort)frame.Length;
machine.SystemBus.WriteBytes(frame.Bytes, rxBD.BufferAddress);
rxBD.WriteBack();
if(rxBD.Wrap)
{
registers.RxQueueBaseAddr = rxBufferBase;
}
else
{
registers.RxQueueBaseAddr += 8;
}
registers.RxStatus |= 1u << 1;
if((registers.InterruptMask & (1u << 1)) == 0)
{
registers.InterruptStatus |= 1u << 1;
interrupt = true;
}
if(interrupt)
{
IRQ.Set();
}
}
}
}
private void SendFrames()
{
lock(sync)
{
txBufferDescriptor txBD = new txBufferDescriptor(machine.SystemBus);
bool interrupt = false;
List <byte> packet = new List<byte>();
txBD.Fetch(registers.TxQueueBaseAddr);
while(!txBD.Used)
{
while(!txBD.Last)
{
packet.AddRange(machine.SystemBus.ReadBytes(txBD.Word0, txBD.Length));
txBD.Used = true;
txBD.WriteBack();
if(txBD.Wrap)
{
registers.TxQueueBaseAddr = txBufferBase;
}
else
{
registers.TxQueueBaseAddr += 8;
}
txBD.Fetch(registers.TxQueueBaseAddr);
}
interrupt = false;
txBD.Used = true;
packet.AddRange(machine.SystemBus.ReadBytes(txBD.Word0, txBD.Length));
if((registers.DMAConfig & 1u << 11) != 0)//if checksum offload enable
{
if((packet[14] & 0xF0) == 0x40) //IP packet
{
ushort cksum;
IPHeaderLength = (ushort)((packet[14] & 0x0F) * 4);
if(packet[23] == 0x06) // TCP packet
{
IPpacket tcpPacket = new IPpacket(IPHeaderLength, IPpacket.PacketType.TCP);
tcpPacket.ReadFromBuffer(packet.ToArray());
cksum = tcpPacket.GetChecksum();
cksum -= 1;
packet[MACHeaderLegth + IPHeaderLength + 16] = (byte)((cksum >> 8) & 0xFF);
packet[MACHeaderLegth + IPHeaderLength + 17] = (byte)((cksum) & 0xFF);
}
else if(packet[23] == 0x11) // UDP packet
{
IPpacket udpPacket = new IPpacket(IPHeaderLength, IPpacket.PacketType.UDP);
udpPacket.ReadFromBuffer(packet.ToArray());
cksum = udpPacket.GetChecksum();
cksum -= 1;
packet[MACHeaderLegth + IPHeaderLength + 6] = (byte)((cksum >> 8) & 0xFF);
packet[MACHeaderLegth + IPHeaderLength + 7] = (byte)((cksum) & 0xFF);
}
}
}
if(Link.IsConnected)
{
var frame = new EthernetFrame(packet.ToArray());
this.Log(LogLevel.Noisy, "Sending packet length {0}", packet.ToArray().Length);
Link.TransmitFrameFromInterface(frame);
}
txBD.WriteBack();
if(txBD.Wrap)
{
registers.TxQueueBaseAddr = txBufferBase;
}
else
{
registers.TxQueueBaseAddr += 8;
}
registers.TxStatus |= 1u << 5; //tx complete
txBD.Fetch(registers.TxQueueBaseAddr);
if(txBD.Used)
{
registers.TxStatus |= 0x01;
if((registers.InterruptMask & (1u << 3)) == 0)
{
registers.InterruptStatus |= 1u << 3;
interrupt = true;
}
}
if((registers.InterruptMask & (1u << 7)) == 0)
{
registers.InterruptStatus |= 1u << 7;
interrupt = true;
}
if(interrupt)
{
IRQ.Set();
}
}
}
}
private void Finished()
{
if(mode == Mode.WaitingForPacket)
{
this.DebugLog("Packet received, LEN {7} {0:x} {1:x} {2:x} {3:x} (...) {4:x} {5:x} {6:x}", request[0], request[1], request[2], request[3], request[currentLength - 5], request[currentLength - 4], request[currentLength - 3], currentLength);
var frame = new byte[currentLength];
Array.Copy(request, 0, frame, 0, currentLength);
var ethernetFrame = new EthernetFrame(frame);
Link.TransmitFrameFromInterface(ethernetFrame);
mode = Mode.Standard;
currentLength = 4;
transmissionEnded = true;
if(interruptAfterTransmision)
{
SignalInterrupt();
}
}
if(mode == Mode.SendingPacket)
{
mode = Mode.Standard;
currentLength = 4;
lock(packetQueue)
{
if(packetQueue.Count > 0)
{
SignalInterrupt();
}
}
}
if(mode == Mode.Special)
{
currentLength = 4;
mode = Mode.Standard;
return;
}
switch(lastPacketType)
{
case 0xC0:
mode = Mode.WaitingForPacket;
var encodedLength = request[3] + (request[4] << 8);
this.DebugLog("Encoded length is 0x{0:X}.", encodedLength);
currentLength = Align(encodedLength + 1 + 1);
transmissionEnded = false;
break;
case 0xF:
lastPacketType = 0;
break;
}
}
// private byte[] macAddress = new byte[] {0,0,0,0,0,0};
#endregion
#region USB descriptors
private void ReceiveFrameInner(EthernetFrame frame)
{
lock(sync)
{
if(!frame.DestinationMAC.Value.IsBroadcast && frame.DestinationMAC.Value != MAC)
{
return;
}
rxPacketQueue.Enqueue(frame);
}
}
public void ReceiveFrame(EthernetFrame frame)//when data is send to us
{
machine.ReportForeignEvent(frame, ReceiveFrameInner);
}
public void ReceiveFrame (EthernetFrame frame)
{
throw new NotImplementedException ();
}
private void ReceiveFrameInner(EthernetFrame frame)
{
if((registers.Control & (1u << 1)) == 0)
{
//if receiving is disabled discard packet
return;
}
var rd = new receiveDescriptor(machine.SystemBus);
rd.Fetch(receiveDescriptorBase | receiveDescriptorOffset);
if(!rd.Enable)
{
//if receive descritptor disabled discard packet
return;
}
machine.SystemBus.WriteBytes(frame.Bytes, (long)rd.PacketAddress);
registers.Status = 1u << 2;
if(rd.Wrap)
{
receiveDescriptorOffset = 0;
}
else
{
if(receiveDescriptorOffset != 0x3f8)
{
receiveDescriptorOffset += 8;
}
else
{
receiveDescriptorOffset = 0;
}
}
if(rd.InterruptEnable && ((registers.Control & (1u << 3)) != 0))
{
registers.Status |= 1u << 2;
this.IRQ.Set();
this.IRQ.Unset();
}
rd.Length = (uint)frame.Length;
rd.Enable = false;
rd.Wrap = false;
rd.WriteBack();
}
private void ReceiveFrameInner(EthernetFrame frame)
{
/*if(machine.ElapsedTime < TimeSpan.FromSeconds(30))
{
return;
}*/
lock(receiveLock)
{
if((dmaStatus & ReceiveStatus) != 0)
{
queue.Enqueue(frame);
return;
}
if(!packetSent)
{
this.Log(LogLevel.Error, "Dropping - no packets sent.");
return;
}
if(frame.Length < 14)
{
this.Log(LogLevel.Error, "DROPPING - packet too short.");
return;
}
if(this.machine.IsPaused)
{
this.Log(LogLevel.Debug, "DROPPING - cpu is halted.");
return;
}
var destinationMac = frame.DestinationMAC.Value;
if(!destinationMac.IsBroadcast && !destinationMac.Equals(MAC))
{
this.Log(LogLevel.Debug, "DROPPING - not for us.");
return;
}
if((dmaInterruptEnable & (ReceiveStatus)) == 0)
{
this.Log(LogLevel.Debug, "DROPPING - rx irq is turned off.");
return;
}
this.Log(LogLevel.Noisy, Misc.DumpPacket(frame, false, machine));
if(dmaReceiveDescriptorListAddress < 0x20000000)
{
// TODO: not in ram
this.Log(LogLevel.Error, "DROPPING - descriptor is not valid.");
return;
}
var written = 0;
var first = true;
var receiveDescriptor = new RxDescriptor(machine.SystemBus);
receiveDescriptor.Fetch(dmaReceiveDescriptorListAddress);
if(receiveDescriptor.IsUsed)
{
this.Log(LogLevel.Error, "DROPPING - descriptor is used.");
return;
}
this.Log(LogLevel.Noisy, "DESCRIPTOR ADDR1={0:X}, ADDR2={1:X}", receiveDescriptor.Address1, receiveDescriptor.Address2);
while(!receiveDescriptor.IsUsed)
{
if(receiveDescriptor.Address1 < 0x20000000)
{
this.Log(LogLevel.Error, "Descriptor points outside of ram, aborting... This should not happen!");
break;
}
receiveDescriptor.IsUsed = true;
receiveDescriptor.IsFirst = first;
first = false;
var howManyBytes = Math.Min(receiveDescriptor.Buffer1Length, frame.Length - written);
var toWriteArray = new byte[howManyBytes];
var bytes = frame.Bytes;
Array.Copy(bytes, written, toWriteArray, 0, howManyBytes);
machine.SystemBus.WriteBytes(toWriteArray, receiveDescriptor.Address1);
written += howManyBytes;
//write second buffer
if(frame.Length - written > 0 && !receiveDescriptor.IsNextDescriptorChained)
{
howManyBytes = Math.Min(receiveDescriptor.Buffer2Length, frame.Length - written);
toWriteArray = new byte[howManyBytes];
Array.Copy(bytes, written, toWriteArray, 0, howManyBytes);
machine.SystemBus.WriteBytes(toWriteArray, receiveDescriptor.Address2);
written += howManyBytes;
}
if(frame.Length - written <= 0)
{
receiveDescriptor.IsLast = true;
this.NoisyLog("Setting descriptor length to {0}", (uint)frame.Length + 4);
receiveDescriptor.FrameLength = (uint)frame.Length + 4;
//with CRC
}
this.NoisyLog("Writing descriptor at 0x{6:X}, first={0}, last={1}, written {2} of {3}. next_chained={4}, endofring={5}", receiveDescriptor.IsFirst, receiveDescriptor.IsLast, written, frame.Length, receiveDescriptor.IsNextDescriptorChained, receiveDescriptor.IsEndOfRing, dmaReceiveDescriptorListAddress);
receiveDescriptor.WriteBack();
if(!receiveDescriptor.IsNextDescriptorChained)
{
dmaReceiveDescriptorListAddress += 8;
}
else if(receiveDescriptor.IsEndOfRing)
{
dmaReceiveDescriptorListAddress = dmaReceiveDescriptorListAddressBegin;
}
else
{
dmaReceiveDescriptorListAddress = receiveDescriptor.Address2;
}
if(frame.Length - written <= 0)
{
if((dmaInterruptEnable & (ReceiveStatus)) != 0)// receive interrupt
{
dmaStatus |= ReceiveStatus;
IRQ.Set();
}
else
{
this.DebugLog("Exiting but not scheduling an interrupt!");
}
break;
}
receiveDescriptor.Fetch(dmaReceiveDescriptorListAddress);
}
this.DebugLog("Packet of length {0} delivered.", frame.Length);
if(written < frame.Length)
{
this.Log(LogLevel.Error, "Delivered only {0} from {1} bytes!", written, frame.Length);
}
}
}
/// <summary>
/// Is invoked by a connected endpoint to transmit a frame to the parent interface.
/// </summary>
/// <param name="frame">
/// Network frame.
/// </param>
public void ReceiveFrameOnInterface(EthernetFrame frame)
{
SendFrameToInterface(frame);
}
private void TransmitLoop(CancellationToken token)
{
while(true)
{
byte[] buffer = null;
if(stream == null)
{
return;
}
try
{
buffer = LibC.ReadDataWithTimeout(stream.Handle, MTU, 1000, () => token.IsCancellationRequested);
}
catch(ArgumentException)
{
// stream was closed
return;
}
catch(ObjectDisposedException)
{
return;
}
if(token.IsCancellationRequested)
{
return;
}
if(buffer == null || buffer.Length == 0)
{
continue;
}
var ethernetFrame = new EthernetFrame(buffer, true);
Link.TransmitFrameFromInterface(ethernetFrame);
}
}
private void ReceiveFrameInner(EthernetFrame frame)
{
lock(lockObj)
{
this.NoisyLog("Received frame on MAC {0}. Frame destination MAC is {1}", this.MAC.ToString(), frame.DestinationMAC);
var size = frame.Length;
var isEven = (size & 1) == 0;
if((receiveControl & ReceiveEnabled) == 0 || (receiveControl & SoftwareReset) != 0)
{
//Drop if reset is on or receiving is not enabled.
return;
}
var packetSize = Math.Max(64, size & ~1);
//64 is the minimal length
packetSize += 6;
var withCRC = (receiveControl & StripCRC) == 0;
if(withCRC)
{
packetSize += 4;
}
if(packetSize > MaxPacketSize)
{
//Maybe we should react to overruns. Now we just drop.
return;
}
byte whichPacket;
if(!TryAllocatePacket(out whichPacket))
{
return;
}
rxFifo.Enqueue(whichPacket);
var status = 0;
if(size > 1518)
{
status |= 0x0800;
}
if(!isEven)
{
status |= 0x1000;
}
var currentBuffer = memoryBuffer[whichPacket];
currentBuffer.Data[0] = (byte)(status & 0xff);
currentBuffer.Data[1] = (byte)(status >> 8);
currentBuffer.Data[2] = (byte)(packetSize & 0xff);
currentBuffer.Data[3] = (byte)(packetSize >> 8);
var frameBytes = frame.Bytes;
for(int i = 0; i < (size & ~1); i++)
{
currentBuffer.Data[4 + i] = frameBytes[i];
}
//Pad with 0s
if(size < 64)
{
var pad = 64 - size;
if(!isEven)
{
for(int i = 0; i < pad; i++)
{
currentBuffer.Data[4 + i + size] = 0;
}
}
else
{
for(int i = 0; i < pad; i++)
{
currentBuffer.Data[4 + i + size + 1] = 0;
}
}
size = 64;
}
if(withCRC)
{
this.Log(LogLevel.Warning, "CRC not implemented.");
}
if(!isEven)
{
//TODO: For a short, odd-length packet, will it work? Should it not be written before?
currentBuffer.Data[packetSize - 2] = frameBytes[size - 1];
currentBuffer.Data[packetSize - 1] = 0x60;
}
else
{
currentBuffer.Data[packetSize - 1] = 0x40;
}
interruptStatus |= RxInterrupt;
Update();
}
}
public byte Transmit()
{
lock(lockObj)
{
int len;
byte whichPacket;
if((transmitControl & TransmitEnabled) == 0)
{
return 0;
}
if(txFifo.Count == 0)
{
return 0;
}
while(txFifo.Count > 0)
{
whichPacket = txFifo.Dequeue();
var currentBuffer = memoryBuffer[whichPacket];
len = currentBuffer.Data[2];
len |= currentBuffer.Data[3] << 8;
len -= 6;
byte [] indata = new byte[len];
for(int j=0; j<len; j++)
{
indata[j] = currentBuffer.Data[j + 4];
}
if((control & ControlAutorelease) != 0)
{
currentBuffer.IsAllocated = false;
}
else
{
sentFifo.Enqueue((byte)whichPacket);
}
var frame = new EthernetFrame(indata);
Link.TransmitFrameFromInterface(frame);
}
Update();
return 0;
}
}
private void SendFrames()
{
this.Log(LogLevel.Noisy, "Sending frame");
var transmitDescriptor = new TxDescriptor(machine.SystemBus);
var packetData = new List<byte>();
transmitDescriptor.Fetch(dmaTransmitDescriptorListAddress);
while(!transmitDescriptor.IsUsed)
{
transmitDescriptor.IsUsed = true;
this.Log(LogLevel.Noisy, "GOING TO READ FROM {0:X}, len={1}", transmitDescriptor.Address1, transmitDescriptor.Buffer1Length);
packetData.AddRange(machine.SystemBus.ReadBytes(transmitDescriptor.Address1, transmitDescriptor.Buffer1Length));
if(!transmitDescriptor.IsNextDescriptorChained)
{
packetData.AddRange(machine.SystemBus.ReadBytes(transmitDescriptor.Address2, transmitDescriptor.Buffer2Length));
}
transmitDescriptor.WriteBack();
if(transmitDescriptor.IsEndOfRing)
{
dmaTransmitDescriptorListAddress = dmaTransmitDescriptorListAddressBegin;
}
else if(transmitDescriptor.IsNextDescriptorChained)
{
dmaTransmitDescriptorListAddress = transmitDescriptor.Address2;
}
else
{
dmaTransmitDescriptorListAddress += 8;
}
if(transmitDescriptor.IsLast)
{
this.Log(LogLevel.Noisy, "Sending frame of {0} bytes.", packetData.Count);
if(Link.IsConnected)
{
var frame = new EthernetFrame(packetData.ToArray());
if(transmitDescriptor.ChecksumInstertionControl > 0)
{
this.Log(LogLevel.Noisy, "Calculating checksum (mode {0}).", transmitDescriptor.ChecksumInstertionControl);
if(transmitDescriptor.ChecksumInstertionControl == 1)
{
//IP only
frame.FillWithChecksums(supportedEtherChecksums, null);
}
else
{
//IP and payload
frame.FillWithChecksums(supportedEtherChecksums, supportedIPChecksums);
}
}
this.Log(LogLevel.Debug, Misc.DumpPacket(frame, true, machine));
packetSent = true;
Link.TransmitFrameFromInterface(frame);
}
}
transmitDescriptor.Fetch(dmaTransmitDescriptorListAddress);
}
//set TransmitBufferUnavailable
dmaStatus |= TransmitBufferUnavailableStatus;
if((dmaInterruptEnable & (StartStopTransmission)) == 0)
{
IRQ.Set();
}
this.Log(LogLevel.Noisy, "Frame sent.");
}
public void ReceiveFrame(EthernetFrame frame)
{
machine.ReportForeignEvent(frame, ReceiveFrameInner);
}
public void WriteDataBulk(USBPacket packet)
{
if(packet.data == null)
return;
byte[] packetToSend;
if(packet.data[5] != 64)
{
packetToSend = new byte[packet.data.Length - 8];
Array.Copy(packet.data, 8, packetToSend, 0, packetToSend.Length);
}
else
{
packetToSend = new byte[packet.data.Length - 12];
Array.Copy(packet.data, 12, packetToSend, 0, packetToSend.Length);
if((packetToSend[14] & 0xF0) == 0x40) //IP packet
{
ushort cksum;
IPHeaderLength = (ushort)((packetToSend[14] & 0x0F) * 4);
if(packetToSend[23] == 0x06) // TCP packet
{
IPpacket tcpPacket = new IPpacket(IPHeaderLength, IPpacket.PacketType.TCP);
tcpPacket.ReadFromBuffer(packetToSend);
cksum = tcpPacket.GetChecksum();
cksum -= 1;
packetToSend[MACHeaderLegth + IPHeaderLength + 16] = (byte)((cksum >> 8) & 0xFF);
packetToSend[MACHeaderLegth + IPHeaderLength + 17] = (byte)((cksum) & 0xFF);
}
else if(packetToSend[23] == 0x11) // UDP packet
{
IPpacket udpPacket = new IPpacket(IPHeaderLength, IPpacket.PacketType.UDP);
udpPacket.ReadFromBuffer(packetToSend);
cksum = udpPacket.GetChecksum();
cksum -= 1;
packetToSend[MACHeaderLegth + IPHeaderLength + 6] = (byte)((cksum >> 8) & 0xFF);
packetToSend[MACHeaderLegth + IPHeaderLength + 7] = (byte)((cksum) & 0xFF);
}
}
}
var frame = new EthernetFrame(packetToSend);
Link.TransmitFrameFromInterface(frame);
}
private void transmitFrame()
{
var td = new transmitDescriptor(machine.SystemBus);
td.Fetch(transmitDescriptorBase | transmitDescriptorOffset);
if(!td.Enable)
{
return; //if decriptor is disabled there is nothing to send (just return)
}
var packet = new EthernetFrame(machine.SystemBus.ReadBytes((long)td.PacketAddress, (int)td.Length));
if(Link.IsConnected)
{
this.Log(LogLevel.Info, "Sending packet length {0}", packet.Length);
this.Log(LogLevel.Info, "Packet address = 0x{0:X}", td.PacketAddress);
Link.TransmitFrameFromInterface(packet);
}
registers.Status |= 1u << 3;
if(td.Wrap)
{
transmitDescriptorOffset = 0;
}
else
{
if(transmitDescriptorOffset != 0x3f8)
{
transmitDescriptorOffset += 8;
}
else
{
transmitDescriptorOffset = 0;
}
}
if(td.InterruptEnable && ((registers.Control & (1u << 2)) != 0))
{
//if interrupts enabled
registers.Status |= 1u << 3; //transmitter interrupt bit
this.IRQ.Set();
this.IRQ.Unset();
}
td.Enable = false;
td.Wrap = false;
td.InterruptEnable = false;
td.Length = 0;
td.UnderrunError = false;
td.AttemptLimitError = false;
td.WriteBack();
}
public void ReceiveFrame(EthernetFrame frame)//when data is send to us
{
throw new NotImplementedException();
}