Good day. I'm trying to write a kernel mode code that uses the TDI interface to accept incoming TCP-connections. And this I can not. Schematic code shown below. Attempt to connect via telnet for the first time succeeds — Irp->IoStatus.Status == STATUS_SUCCESS, but when I try to send / receive data through that connection, I get STATUS_INVALID_DEVICE_STATE (0xC0000184). At this time Process Explorer shows listening socket and the established connection on the same port. Subsequent attempts to connect get Irp->IoStatus.Status == STATUS_CONNECTION_INVALID (0xC000023A). I can not understand why. Maybe I do not understand the mechanism? I would be grateful for the help.

//-------------------------------------------------------------------------------------

/* Listen-socket has two lists — the list of sockets that are waiting to connect — backlog, as I understand it,
** and the list of sockets that are already connected. Access to lists regulates the Queued-SpinLock —
** in order to operate on the list was possible on IRQL <= DISPATCH_LEVEL.
** KernelSocketAccept(__in PKERNEL_SOCKET Socket, __out PKERNEL_SOCKET * AcceptedConnectionSocket) interface function
** waits for SocketConnectedEvent and when connected socket(sockets) appears in the ConnectedSockets list, takes connected
** socket from this list and returns pointer on it in output parameter.
*/

//Kernel-mode socket
typedef struct _KERNEL_SOCKET {

unsigned_native_int Bound;
unsigned_native_int Connected;
unsigned_native_int Listening;

//List pointer
struct _KERNEL_SOCKET * NextSocket;

PDEVICE_OBJECT TransportDeviceObject;
wchar_t * TransportDeviceName;

//File connection to the device to be a transport driver
struct _TransportDeviceFile{
HANDLE Handle;
PFILE_OBJECT Object;
} TransportDeviceFile;

//File of the local address associated with a socket
struct _LocalAddressFile{
HANDLE Handle;
PFILE_OBJECT Object;
} LocalAddressFile;

//List of sockets that are waiting to connect, and a list of sockets for which the connection is established
KERNEL_SOCKET_LIST WaitingSockets;
KERNEL_SOCKET_LIST ConnectedSockets;
//Event, stating that the incoming connection is accepted and connected socket is placed on the list ConnectedSockets
KEVENT SocketConnectedEvent;
} KERNEL_SOCKET, *PKERNEL_SOCKET;

//-------------------------------------------------------------------------------------

//Context structure is transmitted with TDI_ACCEPT IRP
typedef struct _TDI_ACCEPT_IRP_CONTEXT{
//Pointer to Listen-socket
PKERNEL_SOCKET ListeningSocket;
//Pointer to a socket that accepts connection
PKERNEL_SOCKET AcceptSocket;

TDI_CONNECTION_INFORMATION RequestConnectionInformation;
TA_IP_ADDRESS RequestRemoteAddressIPv4;
TA_IP6_ADDRESS RequestRemoteAddressIPv6;
} TDI_ACCEPT_IRP_CONTEXT, *PTDI_ACCEPT_IRP_CONTEXT;

//-------------------------------------------------------------------------------------

//Accept IRP completion routine
IO_COMPLETION_ROUTINE TDIAcceptIRPCompletionRoutine;
static NTSTATUS TDIAcceptIRPCompletionRoutine(__in PDEVICE_OBJECT DeviceObject, __in PIRP Irp, __in PVOID Context){

PTDI_ACCEPT_IRP_CONTEXT TDIAcceptIRPContext = (PTDI_ACCEPT_IRP_CONTEXT)Context;

//If pointer TDIAcceptIRPContext is correct
if(TDIAcceptIRPContext){
//If pointers ListeningSocket and AcceptSocket are correct
if(TDIAcceptIRPContext->ListeningSocket && TDIAcceptIRPContext->AcceptSocket){
//If the connection is successfully established
if(Irp->IoStatus.Status == STATUS_SUCCESS){
//Set the appropriate flag in the socket
TDIAcceptIRPContext->AcceptSocket->Connected = true;

//Add a socket to the list of connected sockets of the listening socket
AppendSocketToSocketList(&TDIAcceptIRPContext->ListeningSocket->ConnectedSockets, TDIAcceptIRPContext->AcceptSocket);

//Set the event, stating that the incoming connection is accepted and connected socket is placed in the list ConnectedSockets
KeSetEvent(&TDIAcceptIRPContext->ListeningSocket->SocketConnectedEvent, IO_NO_INCREMENT, FALSE);
}
}

//Release memory
ExFreeToNPagedLookasideList(&KernelSocketsModule.DataBufferLookAsideList, TDIAcceptIRPContext);
}

IoFreeIrp(Irp);

return STATUS_MORE_PROCESSING_REQUIRED;
}

//-------------------------------------------------------------------------------------

//ClientEventConnect
static NTSTATUS TDIClientEventIncomingConnection(IN PVOID TdiEventContext,
IN LONG RemoteAddressLength,
IN PVOID RemoteAddress,
IN LONG UserDataLength,
IN PVOID UserData,
IN LONG OptionsLength,
IN PVOID Options,
OUT CONNECTION_CONTEXT * ConnectionContext,
OUT PIRP * AcceptIrp){

NTSTATUS ThisFunctionResult = STATUS_CONNECTION_REFUSED;
*ConnectionContext = NULL;
*AcceptIrp = NULL;

//TdiEventContext — is a pointer to KERNEL_SOCKET, for which it was installed this Callback procedure
PKERNEL_SOCKET Socket = (PKERNEL_SOCKET)TdiEventContext;

if(RemoteAddress){
if(RemoteAddressLength >= sizeof(TA_IP_ADDRESS)){
if(((PTA_IP_ADDRESS)RemoteAddress)->Address[0].AddressType == TDI_ADDRESS_TYPE_IP){
//Allocate IRP
PIRP AcceptConnectionIRP = IoAllocateIrp(Socket->TransportDeviceObject->StackSize + 1, FALSE);

//If it succeeded
if(AcceptConnectionIRP){
//Allocate context structure in the non-paged pool
PTDI_ACCEPT_IRP_CONTEXT TDIAcceptIRPContext = (PTDI_ACCEPT_IRP_CONTEXT)ExAllocateFromNPagedLookasideList(&KernelSocketsModule.DataBufferLookAsideList);

//If it succeeded
if(TDIAcceptIRPContext){
//Initialize the contextual structure
local_memset(TDIAcceptIRPContext, 0x00, sizeof(TDI_ACCEPT_IRP_CONTEXT));

TDIAcceptIRPContext->RequestRemoteAddressIPv4.TAAddressCount = 1;
TDIAcceptIRPContext->RequestRemoteAddressIPv4.Address[0].AddressLength = TDI_ADDRESS_LENGTH_IP;
TDIAcceptIRPContext->RequestRemoteAddressIPv4.Address[0].AddressType = TDI_ADDRESS_TYPE_IP;

TDIAcceptIRPContext->RequestRemoteAddressIPv4.Address[0].Address[0].in_addr = ((PTA_IP_ADDRESS)RemoteAddress)->Address[0].Address[0].in_addr;
TDIAcceptIRPContext->RequestRemoteAddressIPv4.Address[0].Address[0].sin_port = ((PTA_IP_ADDRESS)RemoteAddress)->Address[0].Address[0].sin_port;

TDIAcceptIRPContext->RequestConnectionInformation.RemoteAddressLength = sizeof(TA_IP_ADDRESS);
TDIAcceptIRPContext->RequestConnectionInformation.RemoteAddress = &TDIAcceptIRPContext->RequestRemoteAddressIPv4;

//Retrieve the socket from the socket, waiting for connection
PKERNEL_SOCKET SocketFromTheWaitingList = TakeSocketFromSocketList(&Socket->WaitingSockets);

//If it succeeded
if(SocketFromTheWaitingList){
//Put pointers to listening socket and a socket that accepts a connection
TDIAcceptIRPContext->ListeningSocket = Socket;
TDIAcceptIRPContext->AcceptSocket = SocketFromTheWaitingList;

//Forming IRP — TDI_ACCEPT
TdiBuildAccept(AcceptConnectionIRP, Socket->TransportDeviceObject, SocketFromTheWaitingList->TransportDeviceFile.Object, TDIAcceptIRPCompletionRoutine, TDIAcceptIRPContext, &TDIAcceptIRPContext->RequestConnectionInformation, NULL);

IoSetNextIrpStackLocation(AcceptConnectionIRP);

//Output function parameters
*ConnectionContext = (CONNECTION_CONTEXT)Socket;
*AcceptIrp = AcceptConnectionIRP;
ThisFunctionResult = STATUS_MORE_PROCESSING_REQUIRED;
}
}
}
}
}
}

return ThisFunctionResult;
}

//-------------------------------------------------------------------------------------

//Module interface function
NTSTATUS KernelSocketListen(__in PKERNEL_SOCKET Socket){

/* Creation of a number of sockets for use in ClientEventConnect — backlog.
** Creation consists of opening the connection to the transport driver — ZwCreateFile()
** and subsequent TDI_ASSOCIATE_ADDRESS.
** Puts these sockets in the list, access to which regulates the Queued-SpinLock —
** in order to operate on the list was possible on IRQL <= DISPATCH_LEVEL.
** This list is tied to the current listening socket — for which this function is called.
** All these actions are fully successful.
*/

/* Then form the IRP — TDI_SET_EVENT_HANDLER with EventType == TDI_EVENT_CONNECT and
** call IoCallDriver(). As PFILE_OBJECT FileObj gives the address file object of this listen socket.
** Returns STATUS_SUCCESS.
*/

/* It seems that in this function everything is working properly */

return ThisFunctionResult;
}

//-------------------------------------------------------------------------------------