private int HandleAccept(TSocket tacceptSocket)
{
var type = tacceptSocket.Type;
int clientFd = -1;
PosixResult result;
if (type == SocketFlags.TypeAccept)
{
// TODO: should we handle more than 1 accept? If we do, we shouldn't be to eager
// as that might give the kernel the impression we have nothing to do
// which could interfere with the SO_REUSEPORT load-balancing.
result = tacceptSocket.TryAccept(out clientFd, blocking: false);
}
else
{
result = tacceptSocket.TryReceiveSocket(out clientFd, blocking: false);
if (result.Value == 0)
{
// The socket passing us file descriptors has closed.
// We dispose our end so we get get removed from the epoll.
tacceptSocket.Close();
return(0);
}
}
if (result.IsSuccess)
{
TSocket tsocket;
try
{
SocketFlags flags = SocketFlags.TypeClient | (tacceptSocket.IsDeferSend ? SocketFlags.DeferSend : SocketFlags.None);
tsocket = new TSocket(this, clientFd, flags)
{
ZeroCopyThreshold = tacceptSocket.ZeroCopyThreshold
};
bool ipSocket = !object.ReferenceEquals(tacceptSocket.LocalAddress, NotIPSocket);
// Store the last LocalAddress on the tacceptSocket so we might reuse it instead
// of allocating a new one for the same address.
IPEndPointStruct localAddress = default(IPEndPointStruct);
IPEndPointStruct remoteAddress = default(IPEndPointStruct);
if (ipSocket && tsocket.TryGetLocalIPAddress(out localAddress, tacceptSocket.LocalAddress))
{
tsocket.LocalAddress = localAddress.Address;
tsocket.LocalPort = localAddress.Port;
if (tsocket.TryGetPeerIPAddress(out remoteAddress))
{
tsocket.RemoteAddress = remoteAddress.Address;
tsocket.RemotePort = remoteAddress.Port;
}
}
else
{
// This is not an IP socket.
tacceptSocket.LocalAddress = NotIPSocket;
ipSocket = false;
}
if (ipSocket)
{
tsocket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, 1);
}
}
catch
{
IOInterop.Close(clientFd);
return(0);
}
tsocket.MiddlewareTask = _connectionDispatcher.OnConnection(tsocket);
lock (_sockets)
{
_sockets.Add(clientFd, tsocket);
}
bool dataMayBeAvailable = tacceptSocket.IsDeferAccept;
tsocket.Start(dataMayBeAvailable);
return(1);
}
else
{
return(0);
}
}
private TSocket CreateAcceptSocket(IPEndPoint endPoint, SocketFlags flags)
{
int acceptSocketFd = -1;
int port = endPoint.Port;
try
{
bool ipv4 = endPoint.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork;
SocketInterop.Socket(ipv4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, blocking: false,
out acceptSocketFd).ThrowOnError();
TSocket acceptSocket = new TSocket(this, acceptSocketFd, flags);
if (!ipv4)
{
// Kestrel does mapped ipv4 by default.
acceptSocket.SetSocketOption(SOL_IPV6, IPV6_V6ONLY, 0);
}
if (_transportOptions.ReceiveOnIncomingCpu)
{
if (_transportThread.CpuId != -1)
{
if (!acceptSocket.TrySetSocketOption(SOL_SOCKET, SO_INCOMING_CPU, _transportThread.CpuId))
{
_logger.LogWarning($"Cannot enable SO_INCOMING_CPU for {endPoint}");
}
}
}
// Linux: allow bind during linger time
acceptSocket.SetSocketOption(SOL_SOCKET, SO_REUSEADDR, 1);
// Linux: allow concurrent binds and let the kernel do load-balancing
acceptSocket.SetSocketOption(SOL_SOCKET, SO_REUSEPORT, 1);
if ((flags & SocketFlags.DeferAccept) != 0)
{
// Linux: wait up to 1 sec for data to arrive before accepting socket
acceptSocket.SetSocketOption(SOL_TCP, TCP_DEFER_ACCEPT, 1);
}
acceptSocket.ZeroCopyThreshold = LinuxTransportOptions.NoZeroCopy;
if (_transportOptions.ZeroCopy && _transportOptions.ZeroCopyThreshold != LinuxTransportOptions.NoZeroCopy)
{
if (acceptSocket.TrySetSocketOption(SOL_SOCKET, SO_ZEROCOPY, 1))
{
acceptSocket.ZeroCopyThreshold = _transportOptions.ZeroCopyThreshold;
}
}
acceptSocket.Bind(endPoint);
if (port == 0)
{
// When testing we want the OS to select a free port
port = acceptSocket.GetLocalIPAddress().Port;
}
acceptSocket.Listen(ListenBacklog);
endPoint.Port = port;
return(acceptSocket);
}
catch
{
if (acceptSocketFd != -1)
{
IOInterop.Close(acceptSocketFd);
}
throw;
}
}
private TSocket CreateAcceptSocket(IPEndPoint endPoint, SocketFlags flags)
{
int acceptSocketFd = -1;
int port = endPoint.Port;
try
{
bool ipv4 = endPoint.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork;
SocketInterop.Socket(ipv4 ? AddressFamily.InterNetwork : AddressFamily.InterNetworkV6, SocketType.Stream, ProtocolType.Tcp, blocking: false,
out acceptSocketFd).ThrowOnError();
TSocket acceptSocket = new TSocket(this, acceptSocketFd, flags);
if (!ipv4)
{
// Kestrel does mapped ipv4 by default.
acceptSocket.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, 0);
}
if (_transportOptions.ReceiveOnIncomingCpu)
{
if (_transportThread.CpuId != -1)
{
if (!acceptSocket.TrySetSocketOption(SocketOptionLevel.Socket, SocketOptionName.IncomingCpu, _transportThread.CpuId))
{
_logger.LogWarning($"Cannot enable nameof{SocketOptionName.IncomingCpu} for {endPoint}");
}
}
}
// Linux: allow bind during linger time
acceptSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);
// Linux: allow concurrent binds and let the kernel do load-balancing
acceptSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReusePort, 1);
if ((flags & SocketFlags.DeferAccept) != 0)
{
// Linux: wait up to 1 sec for data to arrive before accepting socket
acceptSocket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.DeferAccept, 1);
}
acceptSocket.ZeroCopyThreshold = LinuxTransportOptions.NoZeroCopy;
if (_transportOptions.ZeroCopy && _transportOptions.ZeroCopyThreshold != LinuxTransportOptions.NoZeroCopy)
{
if (acceptSocket.TrySetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ZeroCopy, 1))
{
acceptSocket.ZeroCopyThreshold = _transportOptions.ZeroCopyThreshold;
}
}
acceptSocket.Bind(endPoint);
if (port == 0)
{
// When testing we want the OS to select a free port
port = acceptSocket.GetLocalIPAddress().Port;
}
acceptSocket.Listen(ListenBacklog);
endPoint.Port = port;
return(acceptSocket);
}
catch
{
if (acceptSocketFd != -1)
{
IOInterop.Close(acceptSocketFd);
}
throw;
}
}
private int HandleAccept(TSocket tacceptSocket)
{
var type = tacceptSocket.Type;
int clientFd = -1;
PosixResult result;
if (type == SocketFlags.TypeAccept)
{
// TODO: should we handle more than 1 accept? If we do, we shouldn't be to eager
// as that might give the kernel the impression we have nothing to do
// which could interfere with the SO_REUSEPORT load-balancing.
result = tacceptSocket.TryAccept(out clientFd, blocking: false);
}
else
{
result = tacceptSocket.TryReceiveSocket(out clientFd, blocking: false);
if (result.Value == 0)
{
// The socket passing us file descriptors has closed.
// We dispose our end so we get get removed from the epoll.
tacceptSocket.Close();
return(0);
}
}
if (result.IsSuccess)
{
TSocket tsocket;
try
{
SocketFlags flags = SocketFlags.TypeClient | (tacceptSocket.IsDeferSend ? SocketFlags.DeferSend : SocketFlags.None);
tsocket = new TSocket(this, clientFd, flags, _transportOptions)
{
ZeroCopyThreshold = tacceptSocket.ZeroCopyThreshold
};
var localIpEndPoint = tacceptSocket.LocalEndPoint as IPEndPoint;
bool ipSocket = !object.ReferenceEquals(localIpEndPoint?.Address, NotIPSocket);
// Store the last LocalAddress on the tacceptSocket so we might reuse it instead
// of allocating a new one for the same address.
IPEndPointStruct localAddress = default(IPEndPointStruct);
IPEndPointStruct remoteAddress = default(IPEndPointStruct);
if (ipSocket && tsocket.TryGetLocalIPAddress(out localAddress, localIpEndPoint?.Address))
{
tsocket.LocalEndPoint = new IPEndPoint(localAddress.Address, localAddress.Port);
if (tsocket.TryGetPeerIPAddress(out remoteAddress))
{
tsocket.RemoteEndPoint = new IPEndPoint(remoteAddress.Address, remoteAddress.Port);
}
}
else
{
// This is not an IP socket.
// REVIEW: Should LocalEndPoint be null instead? Some other EndPoint type?
tacceptSocket.LocalEndPoint = new IPEndPoint(NotIPSocket, 0);
ipSocket = false;
}
if (ipSocket)
{
tsocket.SetSocketOption(SOL_TCP, TCP_NODELAY, 1);
}
}
catch
{
IOInterop.Close(clientFd);
return(0);
}
bool accepted = _acceptQueue.Writer.TryWrite(tsocket);
Debug.Assert(accepted, "The connection was not written to the channel!");
lock (_sockets)
{
_sockets.Add(clientFd, tsocket);
}
bool dataMayBeAvailable = tacceptSocket.IsDeferAccept;
tsocket.Start(dataMayBeAvailable);
return(1);
}
else
{
return(0);
}
}