reactos/reactos/lib/drivers/ip/transport/tcp/tcp.c

/*
 * COPYRIGHT:   See COPYING in the top level directory
 * PROJECT:     ReactOS TCP/IP protocol driver
 * FILE:        transport/tcp/tcp.c
 * PURPOSE:     Transmission Control Protocol
 * PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
 *              Art Yerkes (arty@users.sf.net)
 * REVISIONS:
 *   CSH 01/08-2000  Created
 *   arty 12/21/2004 Added accept
 */

#include "precomp.h"

LONG TCP_IPIdentification = 0;
static BOOLEAN TCPInitialized = FALSE;
static NPAGED_LOOKASIDE_LIST TCPSegmentList;
LIST_ENTRY SignalledConnections;
LIST_ENTRY SleepingThreadsList;
FAST_MUTEX SleepingThreadsLock;
RECURSIVE_MUTEX TCPLock;
PORT_SET TCPPorts;

static VOID HandleSignalledConnection( PCONNECTION_ENDPOINT Connection,
				       ULONG NewState ) {
    NTSTATUS Status = STATUS_SUCCESS;
    PTCP_COMPLETION_ROUTINE Complete;
    PTDI_BUCKET Bucket;
    PLIST_ENTRY Entry;
    PIRP Irp;
    PMDL Mdl;

    TI_DbgPrint(MID_TRACE,("Handling signalled state on %x (%x)\n",
                           Connection, Connection->SocketContext));

    /* Things that can happen when we try the initial connection */
    if( NewState & SEL_CONNECT ) {
	while( !IsListEmpty( &Connection->ConnectRequest ) ) {
            Connection->State |= NewState;
            Entry = RemoveHeadList( &Connection->ConnectRequest );
            TI_DbgPrint(DEBUG_TCP, ("Connect Event\n"));

            Bucket = CONTAINING_RECORD( Entry, TDI_BUCKET, Entry );
            Complete = Bucket->Request.RequestNotifyObject;
            TI_DbgPrint(DEBUG_TCP,
                        ("Completing Request %x\n", Bucket->Request));

            if( (NewState & (SEL_CONNECT | SEL_FIN)) ==
                (SEL_CONNECT | SEL_FIN) )
                Status = STATUS_CONNECTION_REFUSED;
            else
                Status = STATUS_SUCCESS;

            Complete( Bucket->Request.RequestContext, Status, 0 );

            /* Frees the bucket allocated in TCPConnect */
            PoolFreeBuffer( Bucket );
        }
    }

    if( NewState & SEL_ACCEPT ) {
	/* Handle readable on a listening socket --
	 * TODO: Implement filtering
	 */

	TI_DbgPrint(DEBUG_TCP,("Accepting new connection on %x (Queue: %s)\n",
			       Connection,
			       IsListEmpty(&Connection->ListenRequest) ?
			       "empty" : "nonempty"));

	while( !IsListEmpty( &Connection->ListenRequest ) ) {
	    PIO_STACK_LOCATION IrpSp;

	    Entry = RemoveHeadList( &Connection->ListenRequest );
	    Bucket = CONTAINING_RECORD( Entry, TDI_BUCKET, Entry );
	    Complete = Bucket->Request.RequestNotifyObject;

	    Irp = Bucket->Request.RequestContext;
	    IrpSp = IoGetCurrentIrpStackLocation( Irp );

	    TI_DbgPrint(DEBUG_TCP,("Getting the socket\n"));
	    Status = TCPServiceListeningSocket
		( Connection->AddressFile->Listener,
		  Bucket->AssociatedEndpoint,
		  (PTDI_REQUEST_KERNEL)&IrpSp->Parameters );

	    TI_DbgPrint(DEBUG_TCP,("Socket: Status: %x\n"));

	    if( Status == STATUS_PENDING ) {
		InsertHeadList( &Connection->ListenRequest, &Bucket->Entry );
		break;
	    } else {
		Complete( Bucket->Request.RequestContext, Status, 0 );
		PoolFreeBuffer( Bucket );
	    }
	}
    }

    /* Things that happen after we're connected */
    if( NewState & SEL_READ ) {
	TI_DbgPrint(DEBUG_TCP,("Readable: irp list %s\n",
			       IsListEmpty(&Connection->ReceiveRequest) ?
			       "empty" : "nonempty"));

	while( !IsListEmpty( &Connection->ReceiveRequest ) ) {
	    OSK_UINT RecvLen = 0, Received = 0;
	    OSK_PCHAR RecvBuffer = 0;

	    Entry = RemoveHeadList( &Connection->ReceiveRequest );
	    Bucket = CONTAINING_RECORD( Entry, TDI_BUCKET, Entry );
	    Complete = Bucket->Request.RequestNotifyObject;

	    Irp = Bucket->Request.RequestContext;
	    Mdl = Irp->MdlAddress;

	    TI_DbgPrint(DEBUG_TCP,
			("Getting the user buffer from %x\n", Mdl));

	    NdisQueryBuffer( Mdl, &RecvBuffer, &RecvLen );

	    TI_DbgPrint(DEBUG_TCP,
			("Reading %d bytes to %x\n", RecvLen, RecvBuffer));

	    TI_DbgPrint(DEBUG_TCP, ("Connection: %x\n", Connection));
	    TI_DbgPrint
		(DEBUG_TCP,
		 ("Connection->SocketContext: %x\n",
		  Connection->SocketContext));
	    TI_DbgPrint(DEBUG_TCP, ("RecvBuffer: %x\n", RecvBuffer));

	    Status = TCPTranslateError
		( OskitTCPRecv( Connection->SocketContext,
				RecvBuffer,
				RecvLen,
				&Received,
				0 ) );

	    TI_DbgPrint(DEBUG_TCP,("TCP Bytes: %d\n", Received));

	    if( Status == STATUS_SUCCESS ) {
		TI_DbgPrint(DEBUG_TCP,("Received %d bytes with status %x\n",
				       Received, Status));

		Complete( Bucket->Request.RequestContext,
			  STATUS_SUCCESS, Received );
		PoolFreeBuffer( Bucket );
	    } else if( Status == STATUS_PENDING ) {
		InsertHeadList
		    ( &Connection->ReceiveRequest, &Bucket->Entry );
		break;
	    } else {
		TI_DbgPrint(DEBUG_TCP,
			    ("Completing Receive request: %x %x\n",
			     Bucket->Request, Status));
		Complete( Bucket->Request.RequestContext, Status, 0 );
		PoolFreeBuffer( Bucket );
	    }
	}
    }
    if( NewState & SEL_WRITE ) {
	TI_DbgPrint(DEBUG_TCP,("Writeable: irp list %s\n",
			       IsListEmpty(&Connection->ReceiveRequest) ?
			       "empty" : "nonempty"));

	while( !IsListEmpty( &Connection->SendRequest ) ) {
	    OSK_UINT SendLen = 0, Sent = 0;
	    OSK_PCHAR SendBuffer = 0;

	    Entry = RemoveHeadList( &Connection->SendRequest );
	    Bucket = CONTAINING_RECORD( Entry, TDI_BUCKET, Entry );
	    Complete = Bucket->Request.RequestNotifyObject;

	    Irp = Bucket->Request.RequestContext;
	    Mdl = Irp->MdlAddress;

	    TI_DbgPrint(DEBUG_TCP,
			("Getting the user buffer from %x\n", Mdl));

	    NdisQueryBuffer( Mdl, &SendBuffer, &SendLen );

	    TI_DbgPrint(DEBUG_TCP,
			("Writing %d bytes to %x\n", SendLen, SendBuffer));

	    TI_DbgPrint(DEBUG_TCP, ("Connection: %x\n", Connection));
	    TI_DbgPrint
		(DEBUG_TCP,
		 ("Connection->SocketContext: %x\n",
		  Connection->SocketContext));

	    Status = TCPTranslateError
		( OskitTCPSend( Connection->SocketContext,
				SendBuffer,
				SendLen,
				&Sent,
				0 ) );

	    TI_DbgPrint(DEBUG_TCP,("TCP Bytes: %d\n", Sent));

	    if( Status == STATUS_SUCCESS ) {
		TI_DbgPrint(DEBUG_TCP,("Sent %d bytes with status %x\n",
				       Sent, Status));

		Complete( Bucket->Request.RequestContext,
			  STATUS_SUCCESS, Sent );
		PoolFreeBuffer( Bucket );
	    } else if( Status == STATUS_PENDING ) {
		InsertHeadList
		    ( &Connection->SendRequest, &Bucket->Entry );
		break;
	    } else {
		TI_DbgPrint(DEBUG_TCP,
			    ("Completing Send request: %x %x\n",
			     Bucket->Request, Status));
		Complete( Bucket->Request.RequestContext, Status, 0 );
		PoolFreeBuffer( Bucket );
	    }
	}
    }

    if( NewState & SEL_FIN ) {
        PLIST_ENTRY ListsToErase[4];
        NTSTATUS    IrpStatus[4];
        UINT i;

	TI_DbgPrint(DEBUG_TCP, ("EOF From socket\n"));

        ListsToErase[0] = &Connection->ReceiveRequest;
        IrpStatus   [0] = STATUS_SUCCESS;
        ListsToErase[1] = &Connection->ListenRequest;
        IrpStatus   [1] = STATUS_UNSUCCESSFUL;
        ListsToErase[2] = &Connection->ConnectRequest;
        IrpStatus   [2] = STATUS_UNSUCCESSFUL;
        ListsToErase[3] = 0;
	IrpStatus   [3] = 0;

        for( i = 0; ListsToErase[i]; i++ ) {
            while( !IsListEmpty( ListsToErase[i] ) ) {
                Entry = RemoveHeadList( ListsToErase[i] );
                Bucket = CONTAINING_RECORD( Entry, TDI_BUCKET, Entry );
                Complete = Bucket->Request.RequestNotifyObject;
                Complete( Bucket->Request.RequestContext, IrpStatus[i], 0 );
		PoolFreeBuffer( Bucket );
            }
        }
    }

    Connection->Signalled = FALSE;
}

VOID DrainSignals() {
    PCONNECTION_ENDPOINT Connection;
    PLIST_ENTRY ListEntry;

    while( !IsListEmpty( &SignalledConnections ) ) {
	ListEntry = RemoveHeadList( &SignalledConnections );
	Connection = CONTAINING_RECORD( ListEntry, CONNECTION_ENDPOINT,
					SignalList );
	HandleSignalledConnection( Connection, Connection->SignalState );
    }
}

PCONNECTION_ENDPOINT TCPAllocateConnectionEndpoint( PVOID ClientContext ) {
    PCONNECTION_ENDPOINT Connection =
	ExAllocatePool(NonPagedPool, sizeof(CONNECTION_ENDPOINT));
    if (!Connection)
	return Connection;

    TI_DbgPrint(DEBUG_CPOINT, ("Connection point file object allocated at (0x%X).\n", Connection));

    RtlZeroMemory(Connection, sizeof(CONNECTION_ENDPOINT));

    /* Initialize spin lock that protects the connection endpoint file object */
    TcpipInitializeSpinLock(&Connection->Lock);
    InitializeListHead(&Connection->ConnectRequest);
    InitializeListHead(&Connection->ListenRequest);
    InitializeListHead(&Connection->ReceiveRequest);
    InitializeListHead(&Connection->SendRequest);

    /* Save client context pointer */
    Connection->ClientContext = ClientContext;

    return Connection;
}

VOID TCPFreeConnectionEndpoint( PCONNECTION_ENDPOINT Connection ) {
    TI_DbgPrint(MAX_TRACE,("FIXME: Cancel all pending requests\n"));
    /* XXX Cancel all pending requests */
    ExFreePool( Connection );
}

NTSTATUS TCPSocket( PCONNECTION_ENDPOINT Connection,
		    UINT Family, UINT Type, UINT Proto ) {
    NTSTATUS Status;

    TI_DbgPrint(DEBUG_TCP,("Called: Connection %x, Family %d, Type %d, "
			   "Proto %d\n",
			   Connection, Family, Type, Proto));

    TcpipRecursiveMutexEnter( &TCPLock, TRUE );
    Status = TCPTranslateError( OskitTCPSocket( Connection,
						&Connection->SocketContext,
						Family,
						Type,
						Proto ) );

    ASSERT_KM_POINTER(Connection->SocketContext);

    TI_DbgPrint(DEBUG_TCP,("Connection->SocketContext %x\n",
			   Connection->SocketContext));

    TcpipRecursiveMutexLeave( &TCPLock );

    return Status;
}

VOID TCPReceive(PIP_INTERFACE Interface, PIP_PACKET IPPacket)
/*
 * FUNCTION: Receives and queues TCP data
 * ARGUMENTS:
 *     IPPacket = Pointer to an IP packet that was received
 * NOTES:
 *     This is the low level interface for receiving TCP data
 */
{
    TI_DbgPrint(DEBUG_TCP,("Sending packet %d (%d) to oskit\n",
			   IPPacket->TotalSize,
			   IPPacket->HeaderSize));

    TcpipRecursiveMutexEnter( &TCPLock, TRUE );

    OskitTCPReceiveDatagram( IPPacket->Header,
			     IPPacket->TotalSize,
			     IPPacket->HeaderSize );

    DrainSignals();

    TcpipRecursiveMutexLeave( &TCPLock );
}

/* event.c */
int TCPSocketState( void *ClientData,
		    void *WhichSocket,
		    void *WhichConnection,
		    OSK_UINT NewState );

int TCPPacketSend( void *ClientData,
		   OSK_PCHAR Data,
		   OSK_UINT Len );

POSK_IFADDR TCPFindInterface( void *ClientData,
			      OSK_UINT AddrType,
			      OSK_UINT FindType,
			      OSK_SOCKADDR *ReqAddr );

NTSTATUS TCPMemStartup( void );
void *TCPMalloc( void *ClientData,
		 OSK_UINT bytes, OSK_PCHAR file, OSK_UINT line );
void TCPFree( void *ClientData,
	      void *data, OSK_PCHAR file, OSK_UINT line );
void TCPMemShutdown( void );

int TCPSleep( void *ClientData, void *token, int priority, char *msg,
	      int tmio );

void TCPWakeup( void *ClientData, void *token );

OSKITTCP_EVENT_HANDLERS EventHandlers = {
    NULL,             /* Client Data */
    TCPSocketState,   /* SocketState */
    TCPPacketSend,    /* PacketSend */
    TCPFindInterface, /* FindInterface */
    TCPMalloc,        /* Malloc */
    TCPFree,          /* Free */
    TCPSleep,         /* Sleep */
    TCPWakeup         /* Wakeup */
};

static KEVENT TimerLoopEvent;
static HANDLE TimerThreadHandle;

/*
 * We are running 2 timers here, one with a 200ms interval (fast) and the other
 * with a 500ms interval (slow). So we need to time out at 200, 400, 500, 600,
 * 800, 1000 and process the "fast" events at 200, 400, 600, 800, 1000 and the
 * "slow" events at 500 and 1000.
 */
static VOID NTAPI
TimerThread(PVOID Context)
{
    LARGE_INTEGER Timeout;
    NTSTATUS Status;
    unsigned Current, NextFast, NextSlow, Next;

    Current = 0;
    Next = 0;
    NextFast = 0;
    NextSlow = 0;
    while ( 1 ) {
        if (Next == NextFast) {
            NextFast += 2;
        }
        if (Next == NextSlow) {
            NextSlow += 5;
        }
        Next = min(NextFast, NextSlow);
        Timeout.QuadPart = (LONGLONG) (Next - Current) * -1000000; /* 100 ms */
        Status = KeWaitForSingleObject(&TimerLoopEvent, Executive, KernelMode,
                                       FALSE, &Timeout);
        if (STATUS_SUCCESS == Status) {
            PsTerminateSystemThread(STATUS_SUCCESS);
        }
        ASSERT(STATUS_TIMEOUT == Status);

        TcpipRecursiveMutexEnter( &TCPLock, TRUE );
        TimerOskitTCP( Next == NextFast, Next == NextSlow );
        if (Next == NextSlow) {
            DrainSignals();
        }
        TcpipRecursiveMutexLeave( &TCPLock );

        Current = Next;
        if (10 <= Current) {
            Current = 0;
            Next = 0;
            NextFast = 0;
            NextSlow = 0;
        }
    }
}

static VOID
StartTimer(VOID)
{
    KeInitializeEvent(&TimerLoopEvent, NotificationEvent, FALSE);
    PsCreateSystemThread(&TimerThreadHandle, THREAD_ALL_ACCESS, 0, 0, 0,
                         TimerThread, NULL);
}


NTSTATUS TCPStartup(VOID)
/*
 * FUNCTION: Initializes the TCP subsystem
 * RETURNS:
 *     Status of operation
 */
{
    NTSTATUS Status;

    TcpipRecursiveMutexInit( &TCPLock );
    ExInitializeFastMutex( &SleepingThreadsLock );
    InitializeListHead( &SleepingThreadsList );
    InitializeListHead( &SignalledConnections );
    Status = TCPMemStartup();
    if ( ! NT_SUCCESS(Status) ) {
	return Status;
    }

    Status = PortsStartup( &TCPPorts, 1, 0xfffe );
    if( !NT_SUCCESS(Status) ) {
	TCPMemShutdown();
	return Status;
    }

    RegisterOskitTCPEventHandlers( &EventHandlers );
    InitOskitTCP();

    /* Register this protocol with IP layer */
    IPRegisterProtocol(IPPROTO_TCP, TCPReceive);

    ExInitializeNPagedLookasideList(
	&TCPSegmentList,                /* Lookaside list */
	NULL,                           /* Allocate routine */
	NULL,                           /* Free routine */
	0,                              /* Flags */
	sizeof(TCP_SEGMENT),            /* Size of each entry */
	TAG('T','C','P','S'),           /* Tag */
	0);                             /* Depth */

    StartTimer();

    TCPInitialized = TRUE;

    return STATUS_SUCCESS;
}


NTSTATUS TCPShutdown(VOID)
/*
 * FUNCTION: Shuts down the TCP subsystem
 * RETURNS:
 *     Status of operation
 */
{
    LARGE_INTEGER WaitForThread;

    if (!TCPInitialized)
	return STATUS_SUCCESS;

    WaitForThread.QuadPart = -2500000; /* 250 ms */
    KeSetEvent(&TimerLoopEvent, IO_NO_INCREMENT, FALSE);
    ZwWaitForSingleObject(TimerThreadHandle, FALSE, &WaitForThread);

    /* Deregister this protocol with IP layer */
    IPRegisterProtocol(IPPROTO_TCP, NULL);

    ExDeleteNPagedLookasideList(&TCPSegmentList);

    TCPInitialized = FALSE;

    DeinitOskitTCP();

    PortsShutdown( &TCPPorts );

    TCPMemShutdown();

    return STATUS_SUCCESS;
}

NTSTATUS TCPTranslateError( int OskitError ) {
    NTSTATUS Status = STATUS_UNSUCCESSFUL;

    switch( OskitError ) {
    case 0: Status = STATUS_SUCCESS; break;
    case OSK_EADDRNOTAVAIL:
    case OSK_EAFNOSUPPORT: Status = STATUS_INVALID_CONNECTION; break;
    case OSK_ECONNREFUSED:
    case OSK_ECONNRESET: Status = STATUS_REMOTE_NOT_LISTENING; break;
    case OSK_EINPROGRESS:
    case OSK_EAGAIN: Status = STATUS_PENDING; break;
    default: Status = STATUS_INVALID_CONNECTION; break;
    }

    TI_DbgPrint(DEBUG_TCP,("Error %d -> %x\n", OskitError, Status));
    return Status;
}

NTSTATUS TCPConnect
( PCONNECTION_ENDPOINT Connection,
  PTDI_CONNECTION_INFORMATION ConnInfo,
  PTDI_CONNECTION_INFORMATION ReturnInfo,
  PTCP_COMPLETION_ROUTINE Complete,
  PVOID Context ) {
    NTSTATUS Status;
    SOCKADDR_IN AddressToConnect = { 0 }, AddressToBind = { 0 };
    IP_ADDRESS RemoteAddress;
    USHORT RemotePort;
    PTDI_BUCKET Bucket;

    TI_DbgPrint(DEBUG_TCP,("TCPConnect: Called\n"));

    Bucket = ExAllocatePool( NonPagedPool, sizeof(*Bucket) );
    if( !Bucket ) return STATUS_NO_MEMORY;

    TcpipRecursiveMutexEnter( &TCPLock, TRUE );

    /* Freed in TCPSocketState */
    Bucket->Request.RequestNotifyObject = (PVOID)Complete;
    Bucket->Request.RequestContext = Context;

    InsertHeadList( &Connection->ConnectRequest, &Bucket->Entry );

    Status = AddrBuildAddress
	((PTRANSPORT_ADDRESS)ConnInfo->RemoteAddress,
	 &RemoteAddress,
	 &RemotePort);

    TI_DbgPrint(DEBUG_TCP,
                ("Connecting to address %x:%x\n",
                 RemoteAddress.Address.IPv4Address,
                 RemotePort));

    if (!NT_SUCCESS(Status)) {
	TI_DbgPrint(DEBUG_TCP, ("Could not AddrBuildAddress in TCPConnect\n"));
	TcpipRecursiveMutexLeave( &TCPLock );
	return Status;
    }

    AddressToConnect.sin_family = AF_INET;
    AddressToBind = AddressToConnect;

    OskitTCPBind( Connection->SocketContext,
		  Connection,
		  &AddressToBind,
		  sizeof(AddressToBind) );

    memcpy( &AddressToConnect.sin_addr,
	    &RemoteAddress.Address.IPv4Address,
	    sizeof(AddressToConnect.sin_addr) );
    AddressToConnect.sin_port = RemotePort;

    Status = TCPTranslateError
	( OskitTCPConnect( Connection->SocketContext,
			   Connection,
			   &AddressToConnect,
			   sizeof(AddressToConnect) ) );

    TcpipRecursiveMutexLeave( &TCPLock );

    return Status;
}

NTSTATUS TCPDisconnect
( PCONNECTION_ENDPOINT Connection,
  UINT Flags,
  PTDI_CONNECTION_INFORMATION ConnInfo,
  PTDI_CONNECTION_INFORMATION ReturnInfo,
  PTCP_COMPLETION_ROUTINE Complete,
  PVOID Context ) {
    NTSTATUS Status;

    TI_DbgPrint(DEBUG_TCP,("started\n"));

    TcpipRecursiveMutexEnter( &TCPLock, TRUE );

    switch( Flags & (TDI_DISCONNECT_ABORT | TDI_DISCONNECT_RELEASE) ) {
    case 0:
    case TDI_DISCONNECT_ABORT:
	Flags = 0;
	break;

    case TDI_DISCONNECT_ABORT | TDI_DISCONNECT_RELEASE:
	Flags = 2;
	break;

    case TDI_DISCONNECT_RELEASE:
	Flags = 1;
	break;
    }

    Status = TCPTranslateError
	( OskitTCPShutdown( Connection->SocketContext, Flags ) );

    TcpipRecursiveMutexLeave( &TCPLock );

    TI_DbgPrint(DEBUG_TCP,("finished %x\n", Status));

    return Status;
}

NTSTATUS TCPClose
( PCONNECTION_ENDPOINT Connection ) {
    NTSTATUS Status;

    TI_DbgPrint(DEBUG_TCP,("TCPClose started\n"));

    TcpipRecursiveMutexEnter( &TCPLock, TRUE );

    Status = TCPTranslateError( OskitTCPClose( Connection->SocketContext ) );

    /* Make our code remove all pending IRPs */
    Connection->State |= SEL_FIN;
    DrainSignals();

    TcpipRecursiveMutexLeave( &TCPLock );

    TI_DbgPrint(DEBUG_TCP,("TCPClose finished %x\n", Status));

    return Status;
}

NTSTATUS TCPReceiveData
( PCONNECTION_ENDPOINT Connection,
  PNDIS_BUFFER Buffer,
  ULONG ReceiveLength,
  PULONG BytesReceived,
  ULONG ReceiveFlags,
  PTCP_COMPLETION_ROUTINE Complete,
  PVOID Context ) {
    OSK_PCHAR DataBuffer;
    UINT DataLen, Received = 0;
    NTSTATUS Status;
    PTDI_BUCKET Bucket;

    TI_DbgPrint(DEBUG_TCP,("Called for %d bytes (on socket %x)\n",
                           ReceiveLength, Connection->SocketContext));

    ASSERT_KM_POINTER(Connection->SocketContext);

    TcpipRecursiveMutexEnter( &TCPLock, TRUE );

    NdisQueryBuffer( Buffer, &DataBuffer, &DataLen );

    TI_DbgPrint(DEBUG_TCP,("TCP>|< Got an MDL %x (%x:%d)\n", Buffer, DataBuffer, DataLen));

    Status = TCPTranslateError
	( OskitTCPRecv
	  ( Connection->SocketContext,
	    DataBuffer,
	    DataLen,
	    &Received,
	    ReceiveFlags ) );

    TI_DbgPrint(DEBUG_TCP,("OskitTCPReceive: %x, %d\n", Status, Received));

    /* Keep this request around ... there was no data yet */
    if( Status == STATUS_PENDING ) {
	/* Freed in TCPSocketState */
	Bucket = ExAllocatePool( NonPagedPool, sizeof(*Bucket) );
	if( !Bucket ) {
	    TI_DbgPrint(DEBUG_TCP,("Failed to allocate bucket\n"));
	    TcpipRecursiveMutexLeave( &TCPLock );
	    return STATUS_NO_MEMORY;
	}

	Bucket->Request.RequestNotifyObject = Complete;
	Bucket->Request.RequestContext = Context;
	*BytesReceived = 0;

	InsertHeadList( &Connection->ReceiveRequest, &Bucket->Entry );
	Status = STATUS_PENDING;
	TI_DbgPrint(DEBUG_TCP,("Queued read irp\n"));
    } else {
	TI_DbgPrint(DEBUG_TCP,("Got status %x, bytes %d\n", Status, Received));
	*BytesReceived = Received;
    }

    TcpipRecursiveMutexLeave( &TCPLock );

    TI_DbgPrint(DEBUG_TCP,("Status %x\n", Status));

    return Status;
}

NTSTATUS TCPSendData
( PCONNECTION_ENDPOINT Connection,
  PCHAR BufferData,
  ULONG SendLength,
  PULONG BytesSent,
  ULONG Flags,
  PTCP_COMPLETION_ROUTINE Complete,
  PVOID Context ) {
    UINT Sent = 0;
    NTSTATUS Status;
    PTDI_BUCKET Bucket;

    TI_DbgPrint(DEBUG_TCP,("Called for %d bytes (on socket %x)\n",
                           SendLength, Connection->SocketContext));

    ASSERT_KM_POINTER(Connection->SocketContext);

    TcpipRecursiveMutexEnter( &TCPLock, TRUE );

    TI_DbgPrint(DEBUG_TCP,("Connection = %x\n", Connection));
    TI_DbgPrint(DEBUG_TCP,("Connection->SocketContext = %x\n",
			   Connection->SocketContext));

    Status = TCPTranslateError
	( OskitTCPSend( Connection->SocketContext,
			(OSK_PCHAR)BufferData, SendLength,
			&Sent, 0 ) );

    TI_DbgPrint(DEBUG_TCP,("OskitTCPSend: %x, %d\n", Status, Sent));

    /* Keep this request around ... there was no data yet */
    if( Status == STATUS_PENDING ) {
	/* Freed in TCPSocketState */
	Bucket = ExAllocatePool( NonPagedPool, sizeof(*Bucket) );
	if( !Bucket ) {
	    TI_DbgPrint(DEBUG_TCP,("Failed to allocate bucket\n"));
	    TcpipRecursiveMutexLeave( &TCPLock );
	    return STATUS_NO_MEMORY;
	}

	Bucket->Request.RequestNotifyObject = Complete;
	Bucket->Request.RequestContext = Context;
	*BytesSent = 0;

	InsertHeadList( &Connection->SendRequest, &Bucket->Entry );
	TI_DbgPrint(DEBUG_TCP,("Queued write irp\n"));
    } else {
	TI_DbgPrint(DEBUG_TCP,("Got status %x, bytes %d\n", Status, Sent));
	*BytesSent = Sent;
    }

    TcpipRecursiveMutexLeave( &TCPLock );

    TI_DbgPrint(DEBUG_TCP,("Status %x\n", Status));

    return Status;
}

VOID TCPTimeout(VOID) {
    /* Now handled by TimerThread */
}

UINT TCPAllocatePort( UINT HintPort ) {
    if( HintPort ) {
	if( AllocatePort( &TCPPorts, HintPort ) ) return HintPort;
	else {
            TI_DbgPrint
                (MID_TRACE,("We got a hint port but couldn't allocate it\n"));
            return (UINT)-1;
        }
    } else return AllocatePortFromRange( &TCPPorts, 1024, 5000 );
}

VOID TCPFreePort( UINT Port ) {
    DeallocatePort( &TCPPorts, Port );
}

NTSTATUS TCPGetPeerAddress
( PCONNECTION_ENDPOINT Connection,
  PTRANSPORT_ADDRESS Address ) {
    OSK_UINT LocalAddress, RemoteAddress;
    OSK_UI16 LocalPort, RemotePort;
    PTA_IP_ADDRESS AddressIP = (PTA_IP_ADDRESS)Address;

    TcpipRecursiveMutexEnter( &TCPLock, TRUE );

    OskitTCPGetAddress
        ( Connection->SocketContext,
          &LocalAddress, &LocalPort,
          &RemoteAddress, &RemotePort );

    AddressIP->TAAddressCount = 1;
    AddressIP->Address[0].AddressLength = TDI_ADDRESS_LENGTH_IP;
    AddressIP->Address[0].AddressType = TDI_ADDRESS_TYPE_IP;
    AddressIP->Address[0].Address[0].sin_port = RemotePort;
    AddressIP->Address[0].Address[0].in_addr = RemoteAddress;

    TcpipRecursiveMutexLeave( &TCPLock );

    return STATUS_SUCCESS;
}

VOID TCPRemoveIRP( PCONNECTION_ENDPOINT Endpoint, PIRP Irp ) {
    PLIST_ENTRY Entry;
    PLIST_ENTRY ListHead[4];
    KIRQL OldIrql;
    PTDI_BUCKET Bucket;
    UINT i = 0;

    ListHead[0] = &Endpoint->SendRequest;
    ListHead[1] = &Endpoint->ReceiveRequest;
    ListHead[2] = &Endpoint->ConnectRequest;
    ListHead[3] = &Endpoint->ListenRequest;

    TcpipAcquireSpinLock( &Endpoint->Lock, &OldIrql );

    for( i = 0; i < sizeof( ListHead ) / sizeof( ListHead[0] ); i++ ) {
	for( Entry = ListHead[i]->Flink;
	     Entry != ListHead[i];
	     Entry = Entry->Flink ) {
	    Bucket = CONTAINING_RECORD( Entry, TDI_BUCKET, Entry );

	    if( Bucket->Request.RequestContext == Irp ) {
		RemoveEntryList( &Bucket->Entry );
		PoolFreeBuffer( Bucket );
		break;
	    }
	}
    }

    TcpipReleaseSpinLock( &Endpoint->Lock, OldIrql );
}

/* EOF */