windows-xp/Source/XPSP1/NT/net/tcpip/driver/tcp/tcpconn.c

/********************************************************************/
/**                     Microsoft LAN Manager                      **/
/**               Copyright(c) Microsoft Corp., 1990-2000          **/
/********************************************************************/
/* :ts=4 */

//** TCPCONN.C - TCP connection mgmt code.
//
//  This file contains the code handling TCP connection related requests,
//  such as connecting and disconnecting.
//

#include "precomp.h"
#include "addr.h"
#include "tcp.h"
#include "tcb.h"
#include "tcpconn.h"
#include "tcpsend.h"
#include "tcprcv.h"
#include "tcpdeliv.h"
#include "tlcommon.h"
#include "info.h"
#include "tcpcfg.h"
#include "pplasl.h"

#if !MILLEN
#include "crypto\rc4.h"
#include "ntddksec.h"
#endif // !MILLEN


uint MaxConnBlocks = DEFAULT_CONN_BLOCKS;
uint ConnPerBlock = MAX_CONN_PER_BLOCK;

uint NextConnBlock = 0;
uint MaxAllocatedConnBlocks = 0;

TCPConnBlock **ConnTable = NULL;
HANDLE TcpConnPool;
extern HANDLE TcpRequestPool;

extern uint TcpHostOpts;

extern uint GlobalMaxRcvWin;

extern uint TCBWalkCount;
extern TCB *PendingFreeList;


extern CACHE_LINE_KSPIN_LOCK PendingFreeLock;

//
// ISN globals.
//

#if !MILLEN
#define ISN_KEY_SIZE            256        // 2048 bits.
#define ISN_DEF_RAND_STORE_SIZE 256
#define ISN_MIN_RAND_STORE_SIZE 1
#define ISN_MAX_RAND_STORE_SIZE 16384

RC4_KEYSTRUCT g_rc4keyIsn;

typedef struct _ISN_RAND_STORE {
    ulong   iBuf;
    ushort* pBuf;
} ISN_RAND_STORE, *PISN_RAND_STORE;

PISN_RAND_STORE g_pRandIsnStore;

ulong g_cRandIsnStore = ISN_DEF_RAND_STORE_SIZE;
ulong g_maskRandIsnStore;
#else // !MILLEN
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
ulong g_dwRandom;
#endif // MILLEN

SeqNum g_CurISN = 0;


uint
InitIsnGenerator()
/*++

Routine Description:

    Initializes the ISN generator. In this case, calls in to get 2048 bits
    random and creates an RC4 key.

Arguments:

    None.

Return Value:

    TRUE  - success.
    FALSE - failure.

Called at PASSIVE level.

--*/

{
#if MILLEN
    g_CurISN = CTESystemUpTime();
    g_dwRandom = g_CurISN;
    return TRUE;
#else // MILLEN
    UNICODE_STRING DeviceName;
    NTSTATUS NtStatus;
    PFILE_OBJECT pFileObject;
    PDEVICE_OBJECT pDeviceObject;
    unsigned char pBuf[ISN_KEY_SIZE];
    PIRP pIrp;
    IO_STATUS_BLOCK ioStatusBlock;
    KEVENT kEvent;
    ULONG cBits = 0;
    ULONG i;
    ULONG cProcs = KeNumberProcessors;

    // Request a block of random bits from the KSecDD driver.
    // To do so, retrieve its device object pointer, build an I/O control
    // request to be submitted to the driver, and submit the request.
    // If any failure occurs, we fall back on the somewhat less-random
    // approach of requesting the bits from the randlibk library.

    do {

        RtlInitUnicodeString(
                             &DeviceName,
                             DD_KSEC_DEVICE_NAME_U);

        KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);

        // Get the file and device objects for KDSECDD,
        // acquire a reference to the device-object,
        // release the unneeded reference to the file-object,
        // and build the I/O control request to issued to KSecDD.

        NtStatus = IoGetDeviceObjectPointer(
                                            &DeviceName,
                                            FILE_ALL_ACCESS,
                                            &pFileObject,
                                            &pDeviceObject);

        if (!NT_SUCCESS(NtStatus)) {
            KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"Tcpip: IoGetDeviceObjectPointer(KSecDD)=%08x\n",
                     NtStatus));
            break;
        }
        ObReferenceObject(pDeviceObject);
        ObDereferenceObject(pFileObject);

        pIrp = IoBuildDeviceIoControlRequest(
                                             IOCTL_KSEC_RNG,
                                             pDeviceObject,
                                             NULL,    // No input buffer.
                                             0,
                                             pBuf,    // Output buffer stores rng.
                                             ISN_KEY_SIZE,
                                             FALSE,
                                             &kEvent,
                                             &ioStatusBlock);

        if (pIrp == NULL) {
            ObDereferenceObject(pDeviceObject);
            NtStatus = STATUS_UNSUCCESSFUL;
            break;
        }
        // Issue the I/O control request, wait for it to complete
        // if necessary, and release the reference to KSecDD's device-object.

        NtStatus = IoCallDriver(pDeviceObject, pIrp);

        if (NtStatus == STATUS_PENDING) {
            KeWaitForSingleObject(
                                  &kEvent,
                                  Executive,
                                  KernelMode,
                                  FALSE,    // Not alertable.
                                  NULL);    // No timeout.

            NtStatus = ioStatusBlock.Status;
        }
        ObDereferenceObject(pDeviceObject);

        if (!NT_SUCCESS(NtStatus)) {
            KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,
                     "Tcpip: IoCallDriver IOCTL_KSEC_RNG failed %#x\n", NtStatus));
            break;
        }
    } while (FALSE);

    if (!NT_SUCCESS(NtStatus)) {
        return FALSE;
    }

    // Generate the key control structure.
    rc4_key(&g_rc4keyIsn, ISN_KEY_SIZE, pBuf);

    // Initalialize the current sequence number to a random value.
    rc4(&g_rc4keyIsn, sizeof(SeqNum), (uchar*)&g_CurISN);

    //
    // Round down the store size to power of 2. Verify in range.
    //

    while (g_cRandIsnStore = g_cRandIsnStore >> 1) {
        cBits++;
    }

    g_cRandIsnStore = 1 << cBits;

    if (g_cRandIsnStore < ISN_MIN_RAND_STORE_SIZE ||
        g_cRandIsnStore > ISN_MAX_RAND_STORE_SIZE) {
        g_cRandIsnStore = ISN_DEF_RAND_STORE_SIZE;
    }
    // The mask is store size - 1.
    g_maskRandIsnStore = g_cRandIsnStore - 1;

    //
    // Initialize the random ISN store. One array/index per processor.
    //

    g_pRandIsnStore = CTEAllocMemBoot(cProcs * sizeof(ISN_RAND_STORE));

    if (g_pRandIsnStore == NULL) {
        KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"Tcpip: failed to allocate ISN rand store\n"));
        return (FALSE);
    }
    memset(g_pRandIsnStore, 0, sizeof(ISN_RAND_STORE) * cProcs);

    for (i = 0; i < cProcs; i++) {
        g_pRandIsnStore[i].pBuf = CTEAllocMemBoot(sizeof(ushort) * g_cRandIsnStore);

        if (g_pRandIsnStore[i].pBuf == NULL) {
            goto error1;
        }
        rc4(
            &g_rc4keyIsn,
            sizeof(ushort) * g_cRandIsnStore,
            (uchar*)g_pRandIsnStore[i].pBuf);
    }

    return (TRUE);

  error1:

    for (i = 0; i < cProcs; i++) {
        if (g_pRandIsnStore[i].pBuf != NULL) {
            CTEFreeMem(g_pRandIsnStore[i].pBuf);
        }
    }
    CTEFreeMem(g_pRandIsnStore);

    return (FALSE);
#endif // !MILLEN
}

VOID
GetRandomISN(
             PULONG SeqNum
             )
/*++

 Routine Description:

    Called when an Initial Sequence Number (ISN) is needed. Calls crypto
    functions for random number generation.

 Arguments:

    pTcb - TCB of connection being opened. Returns the sequence number in
           pTcb->tcb_sendnext.

 Return Value:

    None.

 Notes:

    iBuf is initialized to 0.  Therefore first time through, iStore = 1. This
    ensures that we use the rand bits generated at init time. Also, it means
    that we should not generate new bits until AFTER we have used iStore = 0.

--*/

{
#if MILLEN
    ulong randbits;

    // Pseudo random bits based on time.
    randbits = CTESystemUpTime() + *SeqNum;

    g_dwRandom = ROTATE_LEFT(randbits^g_dwRandom, 15);

    // We want to add between 32K and 64K of random, so adjust. There are 16
    // bits of randomness, just ensure that the high order bit is set and we
    // have >= 32K and <= (64K-1)::15bits of randomness.
    randbits = (g_dwRandom & 0xffff) | 0x8000;

    // Update global CurISN. InterlockedExchangeAdd returns initial value
    // (not the added value).
    *SeqNum = InterlockedExchangeAdd(&g_CurISN, randbits);

    // We don't need to add randbits here. We have randomized the global
    // counter which is good enough for next time we choose ISN.
    /* pTcb->tcb_sendnext += randbits; */

    return;
#else // MILLEN
    ushort randbits;
    ulong iStore;
    ulong iProc;
    KIRQL irql;

    //
    // Raise IRQL to DISPATCH so that we don't get swapped out while accessing
    // the processor specific array. Check to see if already at DISPATCH
    // before doing the work.
    //

    ASSERT(KeGetCurrentIrql() >= DISPATCH_LEVEL);

    iProc = KeGetCurrentProcessorNumber();

    // Get index into the random store. Mask performs mod operation.
    iStore = ++g_pRandIsnStore[iProc].iBuf & g_maskRandIsnStore;
    ASSERT(iStore < g_cRandIsnStore);

    randbits = g_pRandIsnStore[iProc].pBuf[iStore];

    // We want to add between 32K and 64K of random, so adjust. There are 16
    // bits of randomness, just ensure that the high order bit is set and we
    // have >= 32K and <= (64K-1)::15bits of randomness.
    randbits |= 0x8000;

    // Update global CurISN. InterlockedExchangeAdd returns initial value
    // (not the added value).

    *SeqNum = InterlockedExchangeAdd(&g_CurISN, randbits);

    // We don't need to add randbits here. We have randomized the global
    // counter which is good enough for next time we choose ISN.
    /* pTcb->tcb_sendnext += randbits; */

    // Does the random number store need to be regenerated?
    if (iStore == 0) {
        rc4(
            &g_rc4keyIsn,
            sizeof(ushort) * g_cRandIsnStore,
            (uchar*) g_pRandIsnStore[iProc].pBuf);
    }
    return;
#endif // !MILLEN
}


extern PDRIVER_OBJECT TCPDriverObject;

DEFINE_LOCK_STRUCTURE(ConnTableLock)
extern CTELock *pTCBTableLock;
extern CTELock *pTWTCBTableLock;

TCPAddrCheckElement *AddrCheckTable = NULL;        // The current check table

extern IPInfo LocalNetInfo;
extern void RemoveConnFromAO(AddrObj * AO, TCPConn * Conn);

//
// All of the init code can be discarded.
//

int InitTCPConn(void);
void UnInitTCPConn(void);
void NotifyConnLimitProc(CTEEvent * Event, void *Context);

typedef struct ConnLimitExceededStruct {
    CTEEvent cle_event;
    IPAddr cle_addr;
    ulong cle_port;
} ConnLimitExceededStruct;

#ifdef ALLOC_PRAGMA
#pragma alloc_text(INIT, InitTCPConn)
#pragma alloc_text(INIT, UnInitTCPConn)
#pragma alloc_text(PAGE, NotifyConnLimitProc)
#endif


void CompleteConnReq(TCB * CmpltTCB, IPOptInfo * OptInfo, TDI_STATUS Status);

//** Routines for handling conn refcount going to 0.

//* DummyDone - Called when nothing to do.
//
//  Input:  Conn    - Conn goint to 0.
//          Handle  - Lock handle for conn table lock.
//
//  Returns: Nothing.
//
void
DummyDone(TCPConn * Conn, CTELockHandle Handle)
{
    CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), Handle);
}

//* DummyCmplt - Dummy close completion routine.
void
DummyCmplt(PVOID Dummy1, uint Dummy2, uint Dummy3)
{
}

//* CloseDone - Called when we need to complete a close.
//
//  Input:  Conn    - Conn going to 0.
//          Handle  - Lock handle for conn table lock.
//
//  Returns: Nothing.
//
void
CloseDone(TCPConn * Conn, CTELockHandle Handle)
{
    CTEReqCmpltRtn Rtn;            // Completion routine.
    PVOID Context;                // User context for completion routine.
    CTELockHandle AOTableHandle, ConnTableHandle, AOHandle;
    AddrObj *AO;

    ASSERT(Conn->tc_flags & CONN_CLOSING);

    Rtn = Conn->tc_rtn;
    Context = Conn->tc_rtncontext;
    CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), Handle);

    CTEGetLock(&AddrObjTableLock.Lock, &AOTableHandle);
    CTEGetLock(&(Conn->tc_ConnBlock->cb_lock), &ConnTableHandle);
#if DBG
    Conn->tc_ConnBlock->line = (uint) __LINE__;
    Conn->tc_ConnBlock->module = (uchar *) __FILE__;
#endif

    if ((AO = Conn->tc_ao) != NULL) {

        CTEStructAssert(AO, ao);

        // It's associated.
        CTEGetLock(&AO->ao_lock, &AOHandle);
        RemoveConnFromAO(AO, Conn);
        // We've pulled him from the AO, we can free the lock now.
        CTEFreeLock(&AO->ao_lock, AOHandle);
    }
    CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), ConnTableHandle);
    CTEFreeLock(&AddrObjTableLock.Lock, AOTableHandle);

    FreeConn(Conn);

    (*Rtn) (Context, TDI_SUCCESS, 0);

}

//* DisassocDone - Called when we need to complete a disassociate.
//
//  Input:  Conn    - Conn going to 0.
//          Handle  - Lock handle for conn table lock.
//
//  Returns: Nothing.
//
void
DisassocDone(TCPConn * Conn, CTELockHandle Handle)
{
    CTEReqCmpltRtn Rtn;            // Completion routine.
    PVOID Context;                // User context for completion routine.
    AddrObj *AO;
    CTELockHandle AOTableHandle, ConnTableHandle, AOHandle;
    uint NeedClose = FALSE;

    ASSERT(Conn->tc_flags & CONN_DISACC);
    ASSERT(!(Conn->tc_flags & CONN_CLOSING));
    ASSERT(Conn->tc_refcnt == 0);

    Rtn = Conn->tc_rtn;
    Context = Conn->tc_rtncontext;
    Conn->tc_refcnt = 1;
    CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), Handle);

    CTEGetLock(&AddrObjTableLock.Lock, &AOTableHandle);
    CTEGetLock(&(Conn->tc_ConnBlock->cb_lock), &ConnTableHandle);
#if DBG
    Conn->tc_ConnBlock->line = (uint) __LINE__;
    Conn->tc_ConnBlock->module = (uchar *) __FILE__;
#endif
    if (!(Conn->tc_flags & CONN_CLOSING)) {

        AO = Conn->tc_ao;
        if (AO != NULL) {
            CTEGetLock(&AO->ao_lock, &AOHandle);
            RemoveConnFromAO(AO, Conn);
            CTEFreeLock(&AO->ao_lock, AOHandle);
        }
        ASSERT(Conn->tc_refcnt == 1);
        Conn->tc_flags &= ~CONN_DISACC;
    } else
        NeedClose = TRUE;

    Conn->tc_refcnt = 0;
    CTEFreeLock(&AddrObjTableLock.Lock, ConnTableHandle);

    if (NeedClose) {
        CloseDone(Conn, AOTableHandle);
    } else {
        CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), AOTableHandle);
        (*Rtn) (Context, TDI_SUCCESS, 0);
    }

}

PVOID
NTAPI
TcpConnAllocate (
    IN POOL_TYPE PoolType,
    IN SIZE_T NumberOfBytes,
    IN ULONG Tag
    )
{
    TCPConn *Conn;

    Conn = ExAllocatePoolWithTag(PoolType, NumberOfBytes, Tag);

    if (Conn) {
        NdisZeroMemory(Conn, sizeof(TCPConn));

        Conn->tc_connid = INVALID_CONN_ID;
    }
    return Conn;
}


VOID
NTAPI
TcpConnFree (
    IN PVOID Buffer
    )
{
    ExFreePool(Buffer);
}


__inline
VOID
FreeConn(TCPConn *Conn)
{
    PplFree(TcpConnPool, Conn);
}

TCPConn *
GetConn()
{
    TCPConn *Conn;
    uint id;
    TCPConnBlock *ConnBlock;
    LOGICAL FromList;

    Conn = PplAllocate(TcpConnPool, &FromList);
    if (Conn) {

        // If the allocation was satisifed from the lookaside list,
        // we need to reinitialize the connection structure.
        //
        if (FromList)
        {
            // Save these to avoid an expensive lookup later.
            //
            id = Conn->tc_connid;
            ConnBlock = Conn->tc_ConnBlock;

            NdisZeroMemory(Conn, sizeof(TCPConn));

            Conn->tc_connid = id;
            Conn->tc_ConnBlock = ConnBlock;
        }
    }
    return Conn;
}

//* FreeConnReq - Free a connection request structure.
//
//  Called to free a connection request structure.
//
//  Input:  FreedReq    - Connection request structure to be freed.
//
//  Returns: Nothing.
//
__inline
VOID
FreeConnReq(TCPConnReq *Request)
{
    PplFree(TcpRequestPool, Request);
}

//* GetConnReq - Get a connection request structure.
//
//  Called to get a connection request structure.
//
//  Input:  Nothing.
//
//  Returns: Pointer to ConnReq structure, or NULL if none.
//
__inline
TCPConnReq *
GetConnReq(VOID)
{
    TCPConnReq *Request;
    LOGICAL FromList;

    Request = PplAllocate(TcpRequestPool, &FromList);
    if (Request) {
#if DBG
        Request->tcr_req.tr_sig = tr_signature;
        Request->tcr_sig = tcr_signature;
#endif
    }

    return Request;
}

//* GetConnFromConnID - Get a Connection from a connection ID.
//
//  Called to obtain a Connection pointer from a ConnID. We don't actually
//  check the connection pointer here, but we do bounds check the input ConnID
//  and make sure the instance fields match.
//
//  Input:  ConnID      - Connection ID to find a pointer for.

//
//  Returns: Pointer to the TCPConn, or NULL.
//           Also, returns with conn block lock held.
//
TCPConn *
GetConnFromConnID(uint ConnID, CTELockHandle * Handle)
{
    uint ConnIndex = CONN_INDEX(ConnID);
    uint ConnBlockId = CONN_BLOCKID(ConnID);
    uchar inst = CONN_INST(ConnID);
    TCPConn *MatchingConn = NULL;
    TCPConnBlock *ConnBlock;

    if ((ConnIndex < MAX_CONN_PER_BLOCK) &&
        (ConnBlockId < MaxAllocatedConnBlocks)) {

        ConnBlock = (ConnTable)[ConnBlockId];
        if (ConnBlock) {
            MatchingConn = (ConnBlock->cb_conn)[ConnIndex];
        }
        if (MatchingConn != NULL) {
            CTEGetLock(&(ConnBlock->cb_lock), Handle);
#if DBG
            ConnBlock->line = (uint) __LINE__;
            ConnBlock->module = (uchar *) __FILE__;
#endif
            CTEStructAssert(MatchingConn, tc);

            if (inst != MatchingConn->tc_inst) {
                MatchingConn = NULL;
                CTEFreeLock(&(ConnBlock->cb_lock), *Handle);
            }
        }
    } else
        MatchingConn = NULL;

    return MatchingConn;
}

//* GetConnID - Get a ConnTable slot.
//
//  Called during OpenConnection to find a free slot in the ConnTable and
//  set it up with a connection. We assume the caller holds the lock on the
//  TCB ConnTable when we are called.
//
//  Input: NewConn      - Connection to enter into slot..
//
//  Returns: A ConnId to use.
//
uint
GetConnID(TCPConn * NewConn, CTELockHandle * Handle)
{
    uint CurrConnID = NewConn->tc_connid;
    uint i, j, block, k;        // Index variable.
    uint cbindex;
    CTELockHandle TableHandle;
    uchar inst;

    //see if newconn has a valid conn id and if the slot is still free
    //assuming that this came from freelist

    if (CurrConnID != INVALID_CONN_ID) {

        //just peek first.
        //Assuming Connblock as still valid!!

        if (!(NewConn->tc_ConnBlock->cb_conn)[CONN_INDEX(CurrConnID)]) {
            CTEGetLock(&(NewConn->tc_ConnBlock->cb_lock), Handle);
#if DBG
            NewConn->tc_ConnBlock->line = (uint) __LINE__;
            NewConn->tc_ConnBlock->module = (uchar *) __FILE__;
#endif

            //make sure that this slot is still empty

            if (!(NewConn->tc_ConnBlock->cb_conn)[CONN_INDEX(CurrConnID)]) {
                (NewConn->tc_ConnBlock->cb_conn)[CONN_INDEX(CurrConnID)] = NewConn;

                NewConn->tc_ConnBlock->cb_freecons--;

                NewConn->tc_inst = NewConn->tc_ConnBlock->cb_conninst++;

                NewConn->tc_connid = MAKE_CONN_ID(CONN_INDEX(CurrConnID), NewConn->tc_ConnBlock->cb_blockid, NewConn->tc_inst);
                //return with this block_lock held.

                return NewConn->tc_connid;
            }
            CTEFreeLock(&(NewConn->tc_ConnBlock->cb_lock), *Handle);

        }
    }
    //Nope. try searching for a free slot from the last block that
    //we have seen

    if (MaxAllocatedConnBlocks) {

        uint TempMaxConnBlocks = MaxAllocatedConnBlocks;
        uint TempNextConnBlock = NextConnBlock;

        for (k = 0; k < TempMaxConnBlocks; k++) {

            if (TempNextConnBlock >= TempMaxConnBlocks) {
                //wrap around the allocated blocks

                TempNextConnBlock = 0;
            }
            i = TempNextConnBlock;

            //Since this is part of allocated, it can not be null

            ASSERT(ConnTable[TempNextConnBlock] != NULL);

            //Peek if this block  has free slots

            if ((ConnTable[i])->cb_freecons) {

                CTEGetLock(&(ConnTable[i])->cb_lock, Handle);
#if DBG
                ConnTable[i]->line = (uint) __LINE__;
                ConnTable[i]->module = (uchar *) __FILE__;
#endif

                if ((ConnTable[i])->cb_freecons) {
                    //it still has free slots if nextfree is valid
                    // no need to loop around

                    uint index = (ConnTable[i])->cb_nextfree;

                    for (j = 0; j < MAX_CONN_PER_BLOCK; j++) {

                        if (index >= MAX_CONN_PER_BLOCK) {
                            index = 0;
                        }
                        if (!((ConnTable[i])->cb_conn)[index]) {

                            ((ConnTable[i])->cb_conn)[index] = NewConn;
                            (ConnTable[i])->cb_freecons--;

                            inst = NewConn->tc_inst = (ConnTable[i])->cb_conninst++;
                            block = (ConnTable[i])->cb_blockid;
                            NewConn->tc_ConnBlock = ConnTable[i];
                            NewConn->tc_connid = MAKE_CONN_ID(index, block, inst);

                            (ConnTable[i])->cb_nextfree = index++;

                            NextConnBlock = TempNextConnBlock++;

                            if (NextConnBlock > MaxAllocatedConnBlocks) {
                                NextConnBlock = 0;
                            }
                            return NewConn->tc_connid;
                        }
                        index++;

                    }
#if DBG
                    // we should have got a slot if freecons is correct
                    KdPrint(("Connid: Inconsistent freecon %x\n", ConnTable[i]));
                    DbgBreakPoint();
#endif
                }
                CTEFreeLock(&(ConnTable[i])->cb_lock, *Handle);
            }
            //no more freeslots. try next allocated block
            TempNextConnBlock++;
        }
    } //if MaxAllocatedConnBlocks

    //Need to create a conn block at next index.
    //we need a lock for mp safe

    CTEGetLock(&ConnTableLock, Handle);

    if (MaxAllocatedConnBlocks < MaxConnBlocks) {
        uint cbindex = MaxAllocatedConnBlocks;
        TCPConnBlock *ConnBlock;

        ConnBlock = CTEAllocMemN(sizeof(TCPConnBlock), 'CPCT');
        if (ConnBlock) {

            NdisZeroMemory(ConnBlock, sizeof(TCPConnBlock));
            CTEInitLock(&(ConnBlock->cb_lock));
            ConnBlock->cb_blockid = cbindex;

            //hang on to this lock while inserting

            CTEGetLock(&(ConnBlock->cb_lock), &TableHandle);
#if DBG
            ConnBlock->line = (uint) __LINE__;
            ConnBlock->module = (uchar *) __FILE__;
#endif

            //get the first slot for ourselves

            ConnBlock->cb_freecons = MAX_CONN_PER_BLOCK - 1;

            ConnBlock->cb_nextfree = 1;

            inst = ConnBlock->cb_conninst = 1;
            NewConn->tc_ConnBlock = ConnBlock;
            (ConnBlock->cb_conn)[0] = NewConn;

            NewConn->tc_connid = MAKE_CONN_ID(0, cbindex, inst);
            NewConn->tc_inst = inst;
            ConnBlock->cb_conninst++;

            //assignment is atomic!!
            ConnTable[cbindex] = ConnBlock;

            MaxAllocatedConnBlocks++;

            CTEFreeLock(&ConnTableLock, TableHandle);

            return NewConn->tc_connid;
        }
    }
    CTEFreeLock(&ConnTableLock, *Handle);
    return INVALID_CONN_ID;

}

//* FreeConnID - Free a ConnTable slot.
//
//  Called when we're done with a ConnID. We assume the caller holds the lock
//  on the TCB ConnTable when we are called.
//
//  Input: ConnID       - Connection ID to be freed.
//
//  Returns: Nothing.
//
void
FreeConnID(TCPConn * Conn)
{
    uint Index = CONN_INDEX(Conn->tc_connid);    // Index into conn table.
    uint cbIndex = CONN_BLOCKID(Conn->tc_connid);
    TCPConnBlock *ConnBlock = Conn->tc_ConnBlock;

    ASSERT(Index < MAX_CONN_PER_BLOCK);
    ASSERT(cbIndex < MaxAllocatedConnBlocks);
    ASSERT((ConnBlock->cb_conn)[Index] != NULL);

    if ((ConnBlock->cb_conn)[Index]) {
        (ConnBlock->cb_conn)[Index] = NULL;
        ConnBlock->cb_freecons++;
        ConnBlock->cb_nextfree = Index;
        ASSERT(ConnBlock->cb_freecons <= MAX_CONN_PER_BLOCK);
    } else {
        ASSERT(0);
    }
}

//* MapIPError - Map an IP error to a TDI error.
//
//  Called to map an input IP error code to a TDI error code. If we can't,
//  we return the provided default.
//
//  Input:  IPError     - Error code to be mapped.
//          Default     - Default error code to return.
//
//  Returns: Mapped TDI error.
//
TDI_STATUS
MapIPError(IP_STATUS IPError, TDI_STATUS Default)
{
    switch (IPError) {

    case IP_DEST_NET_UNREACHABLE:
        return TDI_DEST_NET_UNREACH;
    case IP_DEST_HOST_UNREACHABLE:
    case IP_NEGOTIATING_IPSEC:
        return TDI_DEST_HOST_UNREACH;
    case IP_DEST_PROT_UNREACHABLE:
        return TDI_DEST_PROT_UNREACH;
    case IP_DEST_PORT_UNREACHABLE:
        return TDI_DEST_PORT_UNREACH;
    default:
        return Default;
    }
}

//* FinishRemoveTCBFromConn - Finish removing a TCB from a conn structure.
//
//  Called when we have the locks we need and we just want to pull the
//  TCB off the connection. The caller must hold the ConnTableLock before
//      calling this.
//
//  Input:  RemovedTCB      - TCB to be removed.
//
//  Returns: Nothing.
//
void
FinishRemoveTCBFromConn(TCB * RemovedTCB)
{
    TCPConn *Conn;
    CTELockHandle AOHandle, TCBHandle, ConnHandle;
    AddrObj *AO;
    TCPConnBlock *ConnBlock = NULL;


    if (((Conn = RemovedTCB->tcb_conn) != NULL) &&
        (Conn->tc_tcb == RemovedTCB)) {

        CTEStructAssert(Conn, tc);
        ConnBlock = Conn->tc_ConnBlock;

        CTEGetLock(&(ConnBlock->cb_lock), &ConnHandle);
#if DBG
        ConnBlock->line = (uint) __LINE__;
        ConnBlock->module = (uchar *) __FILE__;
#endif

        AO = Conn->tc_ao;

        if (AO != NULL) {
            CTEGetLockAtDPC(&AO->ao_lock, &AOHandle);

            if (AO_VALID(AO)) {

                CTEGetLockAtDPC(&RemovedTCB->tcb_lock, &TCBHandle);

                // Need to double check this is still correct.
                if (Conn == RemovedTCB->tcb_conn) {
                    // Everything still looks good.
                    REMOVEQ(&Conn->tc_q);
                    //ENQUEUE(&AO->ao_idleq, &Conn->tc_q);
                    PUSHQ(&AO->ao_idleq, &Conn->tc_q);
                } else
                    Conn = RemovedTCB->tcb_conn;
            } else {
                CTEGetLockAtDPC(&RemovedTCB->tcb_lock, &TCBHandle);
                Conn = RemovedTCB->tcb_conn;
            }

            CTEFreeLockFromDPC(&AO->ao_lock, TCBHandle);
        } else {
            CTEGetLockAtDPC(&RemovedTCB->tcb_lock, &AOHandle);
            Conn = RemovedTCB->tcb_conn;
        }

        if (Conn != NULL) {
            if (Conn->tc_tcb == RemovedTCB) {
#if TRACE_EVENT
                PTDI_DATA_REQUEST_NOTIFY_ROUTINE CPCallBack;
                WMIData WMIInfo;

                CPCallBack = TCPCPHandlerRoutine;
                if (CPCallBack != NULL) {
                    ulong GroupType;
                    WMIInfo.wmi_srcaddr     = RemovedTCB->tcb_saddr;
                    WMIInfo.wmi_srcport     = RemovedTCB->tcb_sport;
                    WMIInfo.wmi_destaddr    = RemovedTCB->tcb_daddr;
                    WMIInfo.wmi_destport    = RemovedTCB->tcb_dport;
                    WMIInfo.wmi_context     = RemovedTCB->tcb_cpcontext;
                    WMIInfo.wmi_size        = 0;
                    GroupType = EVENT_TRACE_GROUP_TCPIP + EVENT_TRACE_TYPE_DISCONNECT;
                    (*CPCallBack) (GroupType, (PVOID) &WMIInfo, sizeof(WMIInfo), NULL);
                }
#endif

                Conn->tc_tcb = NULL;
                //RemovedTCB->tc_connid=0;
                Conn->tc_LastTCB = RemovedTCB;
            } else {

                ASSERT(Conn->tc_tcb == NULL);
            }
        }
        CTEFreeLockFromDPC(&RemovedTCB->tcb_lock, AOHandle);

        ASSERT(ConnBlock != NULL);

        CTEFreeLock(&(ConnBlock->cb_lock), ConnHandle);
    }
}

//* RemoveTCBFromConn - Remove a TCB from a Conn structure.
//
//  Called when we need to disassociate a TCB from a connection structure.
//  All we do is get the appropriate locks and call FinishRemoveTCBFromConn.
//
//  Input:  RemovedTCB      - TCB to be removed.
//
//  Returns: Nothing.
//
void
RemoveTCBFromConn(TCB * RemovedTCB)
{
    CTELockHandle ConnHandle, TCBHandle;

    CTEStructAssert(RemovedTCB, tcb);

    FinishRemoveTCBFromConn(RemovedTCB);
}

//* RemoveConnFromTCB - Remove a conn from a TCB.
//
//  Called when we want to break the final association between a connection
//  and a TCB.
//
//  Input:  RemoveTCB   - TCB to be removed.
//
//  Returns: Nothing.
//
void
RemoveConnFromTCB(TCB * RemoveTCB)
{
    ConnDoneRtn DoneRtn = NULL;
    CTELockHandle ConnHandle, TCBHandle;
    TCPConn *Conn;


    if ((Conn = RemoveTCB->tcb_conn) != NULL) {

        CTEGetLock(&(Conn->tc_ConnBlock->cb_lock), &ConnHandle);
#if DBG
        Conn->tc_ConnBlock->line = (uint) __LINE__;
        Conn->tc_ConnBlock->module = (uchar *) __FILE__;
#endif
        CTEGetLock(&RemoveTCB->tcb_lock, &TCBHandle);

        CTEStructAssert(Conn, tc);

        if (--(Conn->tc_refcnt) == 0)
            DoneRtn = Conn->tc_donertn;

        RemoveTCB->tcb_conn = NULL;

        CTEFreeLock(&RemoveTCB->tcb_lock, TCBHandle);
    }
    if (DoneRtn != NULL) {

        (*DoneRtn) (Conn, ConnHandle);

    } else {
        if (Conn) {
            CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), ConnHandle);
        }
        //CTEFreeLock(&ConnTableLock, ConnHandle);
    }
}

//* CloseTCB - Close a TCB.
//
//  Called when we are done with a TCB, and want to free it. We'll remove
//  him from any tables that he's in, and destroy any outstanding requests.
//
//  Input:  ClosedTCB       - TCB to be closed.
//          Handle          - Lock handle for TCB.
//
//  Returns: Nothing.
//
void
CloseTCB(TCB * ClosedTCB, CTELockHandle Handle)
{


    CTELockHandle ConnTableHandle, TCBTableHandle, PendHandle;
    uchar OrigState = ClosedTCB->tcb_state;
    TDI_STATUS Status;
    uint OKToFree;
    uint Partition = ClosedTCB->tcb_partition;
    RouteCacheEntry* RCE = ClosedTCB->tcb_rce;
    CTEStructAssert(ClosedTCB, tcb);
    ASSERT(ClosedTCB->tcb_refcnt == 0);
    ASSERT(ClosedTCB->tcb_state != TCB_CLOSED);
    ASSERT(ClosedTCB->tcb_pending & DEL_PENDING);

    // We'll check to make sure that our state isn't CLOSED. This should never
    // happen, since nobody should call TryToCloseTCB when the state is
    // closed, or take the reference count if we're closing. Nevertheless,
    // we'll double check as a safety measure.

    if (ClosedTCB->tcb_state == TCB_CLOSED) {
        CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
        return;
    } else {

        // Update SNMP counters. If we're in SYN-SENT or SYN-RCVD, this is a failed
        // connection attempt. If we're in ESTABLISED or CLOSE-WAIT, treat this
        // as an 'Established Reset' event.
        if (ClosedTCB->tcb_state == TCB_SYN_SENT ||
            ClosedTCB->tcb_state == TCB_SYN_RCVD)
            TStats.ts_attemptfails++;
        else if (ClosedTCB->tcb_state == TCB_ESTAB ||
                 ClosedTCB->tcb_state == TCB_CLOSE_WAIT) {
            TStats.ts_estabresets++;
            TStats.ts_currestab--;

            }


        ClosedTCB->tcb_state = TCB_CLOSED;
        ClosedTCB->tcb_rce = NULL;
        CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
    }

    // Remove the TCB from it's associated TCPConn structure, if it has one.

    //this takes the appropriate conntable lock.
    FinishRemoveTCBFromConn(ClosedTCB);


    if (SYNC_RCVD_STATE(OrigState) && !GRACEFUL_CLOSED_STATE(OrigState)) {
        if (ClosedTCB->tcb_flags & NEED_RST)
            SendRSTFromTCB(ClosedTCB, RCE);
    }
    (*LocalNetInfo.ipi_freeopts) (&ClosedTCB->tcb_opt);

    if (RCE) {
        (*LocalNetInfo.ipi_closerce)(RCE);
    }

    CTEGetLock(&ClosedTCB->tcb_lock, &Handle);

    if (ClosedTCB->tcb_closereason & TCB_CLOSE_RST)
        Status = TDI_CONNECTION_RESET;
    else if (ClosedTCB->tcb_closereason & TCB_CLOSE_ABORTED)
        Status = TDI_CONNECTION_ABORTED;
    else if (ClosedTCB->tcb_closereason & TCB_CLOSE_TIMEOUT)
        Status = MapIPError(ClosedTCB->tcb_error, TDI_TIMED_OUT);
    else if (ClosedTCB->tcb_closereason & TCB_CLOSE_REFUSED)
        Status = TDI_CONN_REFUSED;
    else if (ClosedTCB->tcb_closereason & TCB_CLOSE_UNREACH)
        Status = MapIPError(ClosedTCB->tcb_error, TDI_DEST_UNREACHABLE);
    else
        Status = TDI_SUCCESS;

    // Ref this TCB so that it will not go away until
    // we cleanup pending requests.
    ClosedTCB->tcb_refcnt++;

    // Now complete any outstanding requests on the TCB.
    if (ClosedTCB->tcb_connreq != NULL) {
        TCPConnReq *ConnReq = ClosedTCB->tcb_connreq;
        CTEStructAssert(ConnReq, tcr);

        CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
        (*ConnReq->tcr_req.tr_rtn) (ConnReq->tcr_req.tr_context, Status, 0);
        FreeConnReq(ConnReq);
        CTEGetLock(&ClosedTCB->tcb_lock, &Handle);
    }
    if (ClosedTCB->tcb_discwait != NULL) {
        TCPConnReq *ConnReq = ClosedTCB->tcb_discwait;
        CTEStructAssert(ConnReq, tcr);

        CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
        (*ConnReq->tcr_req.tr_rtn) (ConnReq->tcr_req.tr_context, Status, 0);
        FreeConnReq(ConnReq);
        CTEGetLock(&ClosedTCB->tcb_lock, &Handle);
    }
    while (!EMPTYQ(&ClosedTCB->tcb_sendq)) {
        TCPReq *Req;
        TCPSendReq *SendReq;
        long Result;
        uint SendReqFlags;

        DEQUEUE(&ClosedTCB->tcb_sendq, Req, TCPReq, tr_q);

        CTEStructAssert(Req, tr);
        SendReq = (TCPSendReq *) Req;
        CTEStructAssert(SendReq, tsr);

        // Decrement the initial reference put on the buffer when it was
        // allocated. This reference would have been decremented if the
        // send had been acknowledged, but then the send would not still
        // be on the tcb_sendq.

        SendReqFlags = SendReq->tsr_flags;

        if (SendReqFlags & TSR_FLAG_SEND_AND_DISC) {

            BOOLEAN BytesSentOkay=FALSE;
            ASSERT(ClosedTCB->tcb_fastchk & TCP_FLAG_SEND_AND_DISC);

            if ((ClosedTCB->tcb_unacked == 0) &&
                    (ClosedTCB->tcb_sendnext == ClosedTCB->tcb_sendmax) &&
                    (ClosedTCB->tcb_sendnext == (ClosedTCB->tcb_senduna + 1) ||
                    (ClosedTCB->tcb_sendnext == ClosedTCB->tcb_senduna)) ) {
                BytesSentOkay=TRUE;
            }

            if (BytesSentOkay && !(ClosedTCB->tcb_closereason == TCB_CLOSE_TIMEOUT)){
                Status = TDI_SUCCESS;
            }
        }

        SendReq->tsr_req.tr_status = Status;

        Result = CTEInterlockedDecrementLong(&SendReq->tsr_refcnt);

        ASSERT(Result >= 0);

        if (Result <= 0) {
            // If we've sent directly from this send, NULL out the next
            // pointer for the last buffer in the chain.
            if (SendReq->tsr_lastbuf != NULL) {
                NDIS_BUFFER_LINKAGE(SendReq->tsr_lastbuf) = NULL;
                SendReq->tsr_lastbuf = NULL;
            }
            CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
            (*Req->tr_rtn) (Req->tr_context, Status, Status == TDI_SUCCESS ? SendReq->tsr_size : 0);
            CTEGetLock(&ClosedTCB->tcb_lock, &Handle);
            FreeSendReq(SendReq);

        } else {
            // The send request will be freed when all outstanding references
            // to it have completed.
            //SendReq->tsr_req.tr_status = Status;
            if ((SendReqFlags & TSR_FLAG_SEND_AND_DISC) && (Result <= 1)) {

                // If we've sent directly from this send, NULL out the next
                // pointer for the last buffer in the chain.
                if (SendReq->tsr_lastbuf != NULL) {
                    NDIS_BUFFER_LINKAGE(SendReq->tsr_lastbuf) = NULL;
                    SendReq->tsr_lastbuf = NULL;
                }
                CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
                (*Req->tr_rtn) (Req->tr_context, Status, Status == TDI_SUCCESS ? SendReq->tsr_size : 0);
                CTEGetLock(&ClosedTCB->tcb_lock, &Handle);
                FreeSendReq(SendReq);

            }
        }
    }

    while (ClosedTCB->tcb_rcvhead != NULL) {
        TCPRcvReq *RcvReq;

        RcvReq = ClosedTCB->tcb_rcvhead;
        CTEStructAssert(RcvReq, trr);
        ClosedTCB->tcb_rcvhead = RcvReq->trr_next;
        CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
        (*RcvReq->trr_rtn) (RcvReq->trr_context, Status, 0);
        CTEGetLock(&ClosedTCB->tcb_lock, &Handle);
        FreeRcvReq(RcvReq);
    }

    while (ClosedTCB->tcb_exprcv != NULL) {
        TCPRcvReq *RcvReq;

        RcvReq = ClosedTCB->tcb_exprcv;
        CTEStructAssert(RcvReq, trr);
        ClosedTCB->tcb_exprcv = RcvReq->trr_next;

        CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
        (*RcvReq->trr_rtn) (RcvReq->trr_context, Status, 0);
        CTEGetLock(&ClosedTCB->tcb_lock, &Handle);
        FreeRcvReq(RcvReq);
    }

    if (ClosedTCB->tcb_pendhead != NULL)
        FreeRBChain(ClosedTCB->tcb_pendhead);

    if (ClosedTCB->tcb_urgpending != NULL)
        FreeRBChain(ClosedTCB->tcb_urgpending);

    while (ClosedTCB->tcb_raq != NULL) {
        TCPRAHdr *Hdr;

        Hdr = ClosedTCB->tcb_raq;
        CTEStructAssert(Hdr, trh);
        ClosedTCB->tcb_raq = Hdr->trh_next;
        if (Hdr->trh_buffer != NULL)
            FreeRBChain(Hdr->trh_buffer);

        CTEFreeMem(Hdr);
    }

    CTEFreeLock(&ClosedTCB->tcb_lock, Handle);

    RemoveConnFromTCB(ClosedTCB);

    CTEGetLock(&pTCBTableLock[Partition], &TCBTableHandle);

    CTEGetLockAtDPC(&ClosedTCB->tcb_lock, &Handle);

    ClosedTCB->tcb_refcnt--;

    OKToFree = RemoveTCB(ClosedTCB);

    // He's been pulled from the appropriate places so nobody can find him.
    // Free the locks, and proceed to destroy any requests, etc.

    CTEFreeLockFromDPC(&ClosedTCB->tcb_lock, DISPATCH_LEVEL);

    CTEFreeLock(&pTCBTableLock[Partition], TCBTableHandle);

    if (OKToFree) {
        FreeTCB(ClosedTCB);
    }
}

//* TryToCloseTCB - Try to close a TCB.
//
//  Called when we need to close a TCB, but don't know if we can. If
//  the reference count is 0, we'll call CloseTCB to deal with it.
//  Otherwise we'll set the DELETE_PENDING bit and deal with it when
//  the ref. count goes to 0. We assume the TCB is locked when we are called.
//
//  Input:  ClosedTCB       - TCB to be closed.
//          Reason          - Reason we're closing.
//          Handle          - Lock handle for TCB.
//
//  Returns: Nothing.
//
void
TryToCloseTCB(TCB * ClosedTCB, uchar Reason, CTELockHandle Handle)
{
    CTEStructAssert(ClosedTCB, tcb);
    ASSERT(ClosedTCB->tcb_state != TCB_CLOSED);

    ClosedTCB->tcb_closereason |= Reason;

    if (ClosedTCB->tcb_pending & DEL_PENDING) {
        CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
        return;
    }
    ClosedTCB->tcb_pending |= DEL_PENDING;
    ClosedTCB->tcb_slowcount++;
    ClosedTCB->tcb_fastchk |= TCP_FLAG_SLOW;

    if (ClosedTCB->tcb_refcnt == 0)
        CloseTCB(ClosedTCB, Handle);
    else {
        CTEFreeLock(&ClosedTCB->tcb_lock, Handle);
    }
}

//* DerefTCB - Dereference a TCB.
//
//  Called when we're done with a TCB, and want to let exclusive user
//  have a shot. We dec. the refcount, and if it goes to zero and there
//  are pending actions, we'll perform one of the pending actions.
//
//  Input:  DoneTCB         - TCB to be dereffed.
//          Handle          - Lock handle to be used when freeing TCB lock.
//
//  Returns: Nothing.
//
void
DerefTCB(TCB * DoneTCB, CTELockHandle Handle)
{
    ASSERT(DoneTCB->tcb_refcnt != 0);
    if (DEREFERENCE_TCB(DoneTCB) == 0) {
        if (DoneTCB->tcb_pending == 0) {
            CTEFreeLock(&DoneTCB->tcb_lock, Handle);
            return;
        } else {
            if (DoneTCB->tcb_pending & DEL_PENDING)
                CloseTCB(DoneTCB, Handle);
            else if (DoneTCB->tcb_pending & FREE_PENDING) {

                RouteCacheEntry* RCE = DoneTCB->tcb_rce;
                DoneTCB->tcb_rce = NULL;
                (*LocalNetInfo.ipi_freeopts) (&DoneTCB->tcb_opt);

                // Need to take this TCB out of the timerwheel if it is in there.
                if( DoneTCB->tcb_timerslot != DUMMY_SLOT) {
                  ASSERT( DoneTCB->tcb_timerslot < TIMER_WHEEL_SIZE );
                  RemoveFromTimerWheel( DoneTCB );
                }

                CTEFreeLock(&DoneTCB->tcb_lock, Handle);

                // Close the RCE on this guy.
                if (RCE) {
                    (*LocalNetInfo.ipi_closerce) (RCE);
                }

                CTEGetLock(&PendingFreeLock.Lock, &Handle);
                if (TCBWalkCount != 0) {

#ifdef  PENDING_FREE_DBG
                    if( DoneTCB->tcb_flags & IN_TCB_TABLE)
                        DbgBreakPoint();
#endif

                    //tcbtimeout is walking the table
                    //Let it free this tcb too.
                    DoneTCB->tcb_walkcount = TCBWalkCount + 1;
                    *(TCB **) & DoneTCB->tcb_delayq.q_next = PendingFreeList;
                    PendingFreeList = DoneTCB;
                    CTEFreeLock(&PendingFreeLock.Lock, Handle);
                    return;

                } else {

                    CTEFreeLock(&PendingFreeLock.Lock, Handle);
                }
                //it is okay to free this.

                FreeTCB(DoneTCB);
            } else
                ASSERT(0);

            return;
        }
    }
    CTEFreeLock(&DoneTCB->tcb_lock, Handle);
}

//** TdiOpenConnection - Open a connection.
//
//  This is the TDI Open Connection entry point. We open a connection,
//  and save the caller's connection context. A TCPConn structure is allocated
//  here, but a TCB isn't allocated until the Connect or Listen is done.
//
//  Input:  Request         - Pointed to a TDI request structure.
//          Context         - Connection context to be saved for connection.
//
//  Returns: Status of attempt to open the connection.
//
TDI_STATUS
TdiOpenConnection(PTDI_REQUEST Request, PVOID Context)
{
    TCPConn *NewConn;            // The newly opened connection.
    CTELockHandle Handle;        // Lock handle for TCPConnTable.
    uint ConnID;                // New ConnID.
    TDI_STATUS Status;            // Status of this request.

    NewConn = GetConn();

    if (NewConn != NULL) {        // We allocated a connection.

#if DBG
        NewConn->tc_sig = tc_signature;
#endif
        NewConn->tc_tcb = NULL;
        NewConn->tc_ao = NULL;
        NewConn->tc_context = Context;

        ConnID = GetConnID(NewConn, &Handle);
        if (ConnID != INVALID_CONN_ID) {
            // We successfully got a ConnID.
            Request->Handle.ConnectionContext = UintToPtr(ConnID);
            NewConn->tc_refcnt = 0;
            NewConn->tc_flags = 0;
            NewConn->tc_tcbflags = NAGLING | (BSDUrgent ? BSD_URGENT : 0);
            if (DefaultRcvWin != 0) {
                if (!(TcpHostOpts & TCP_FLAG_WS) && DefaultRcvWin > 0xFFFF) {
                    NewConn->tc_window = 0xFFFF;

                } else {
                    NewConn->tc_window = DefaultRcvWin;
                }
                NewConn->tc_flags |= CONN_WINSET;
            } else {

                NewConn->tc_window = DEFAULT_RCV_WIN;
            }

            NewConn->tc_donertn = DummyDone;
#if !MILLEN
            NewConn->tc_owningpid = HandleToUlong(PsGetCurrentProcessId());
#endif

            Request->RequestContext = NewConn;
            Status = TDI_SUCCESS;

            CTEFreeLock(&(NewConn->tc_ConnBlock->cb_lock), Handle);
        } else {
            FreeConn(NewConn);

            Status = TDI_NO_RESOURCES;
        }

        return Status;
    }
    // Couldn't get a connection.
    return TDI_NO_RESOURCES;

}

//* RemoveConnFromAO - Remove a connection from an AddrObj.
//
//  A little utility routine to remove a connection from an AddrObj.
//  We run down the connections on the AO, and when we find him we splice
//  him out. We assume the caller holds the locks on the AddrObj and the
//  TCPConnTable lock.
//
//  Input:  AO          - AddrObj to remove from.
//          Conn        - Conn to remove.
//
//  Returns: Nothing.
//
void
RemoveConnFromAO(AddrObj * AO, TCPConn * Conn)
{

    CTEStructAssert(AO, ao);
    CTEStructAssert(Conn, tc);

    REMOVEQ(&Conn->tc_q);
    Conn->tc_ao = NULL;

}

//* TdiCloseConnection - Close a connection.
//
//  Called when the user is done with a connection, and wants to close it.
//  We look the connection up in our table, and if we find it we'll remove
//  the connection from the AddrObj it's associate with (if any). If there's
//  a TCB associated with the connection we'll close it also.
//
//  There are some interesting wrinkles related to closing while a TCB
//  is still referencing the connection (i.e. tc_refcnt != 0) or while a
//  disassociate address is in progress. See below for more details.
//
//  Input:  Request         - Request identifying connection to be closed.
//
//  Returns: Status of attempt to close.
//
TDI_STATUS
TdiCloseConnection(PTDI_REQUEST Request)
{
    uint ConnID = PtrToUlong(Request->Handle.ConnectionContext);
    CTELockHandle TableHandle;
    TCPConn *Conn;
    TDI_STATUS Status;

    //CTEGetLock(&ConnTableLock, &TableHandle);

    // We have the locks we need. Try to find a connection.
    Conn = GetConnFromConnID(ConnID, &TableHandle);

    if (Conn != NULL) {
        CTELockHandle TCBHandle;
        TCB *ConnTCB;

        // We found the connection. Free the ConnID and mark the connection
        // as closing.

        CTEStructAssert(Conn, tc);

        FreeConnID(Conn);

        Conn->tc_flags |= CONN_CLOSING;

        // See if there's a TCB referencing this connection.
        // If there is, we'll need to wait until he's done before closing him.
        // We'll hurry the process along if we still have a pointer to him.

        if (Conn->tc_refcnt != 0) {
            CTEReqCmpltRtn Rtn;
            PVOID Context;

            // A connection still references him. Save the current rtn stuff
            // in case we are in the middle of disassociating him from an
            // address, and store the caller's callback routine and our done
            // routine.
            Rtn = Conn->tc_rtn;
            Context = Conn->tc_rtncontext;

            Conn->tc_rtn = Request->RequestNotifyObject;
            Conn->tc_rtncontext = Request->RequestContext;
            Conn->tc_donertn = CloseDone;

            // See if we're in the middle of disassociating him
            if (Conn->tc_flags & CONN_DISACC) {

                // We are disassociating him. We'll free the conn table lock
                // now and fail the disassociate request. Note that when
                // we free the lock the refcount could go to zero. This is
                // OK, because we've already stored the neccessary info. in
                // the connection so the caller will get called back if it
                // does. From this point out we return PENDING, so a callback
                // is OK. We've marked him as closing, so the disassoc done
                // routine will bail out if we've interrupted him. If the ref.
                // count does go to zero, Conn->tc_tcb would have to be NULL,
                // so in that case we'll just fall out of this routine.

                CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), TableHandle);
                (*Rtn) (Context, (uint) TDI_REQ_ABORTED, 0);
                CTEGetLock(&(Conn->tc_ConnBlock->cb_lock), &TableHandle);
#if DBG
                Conn->tc_ConnBlock->line = (uint) __LINE__;
                Conn->tc_ConnBlock->module = (uchar *) __FILE__;
#endif
            }
            ConnTCB = Conn->tc_tcb;
            if (ConnTCB != NULL) {

                CTEStructAssert(ConnTCB, tcb);
                // We have a TCB. Take the lock on him and get ready to
                // close him.
                CTEGetLock(&ConnTCB->tcb_lock, &TCBHandle);
                if (ConnTCB->tcb_state != TCB_CLOSED) {
                    ConnTCB->tcb_flags |= NEED_RST;

                    CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), TCBHandle);
                    //CTEFreeLock(&ConnTableLock, TCBHandle);
                    if (!CLOSING(ConnTCB))
                        TryToCloseTCB(ConnTCB, TCB_CLOSE_ABORTED, TableHandle);
                    else
                        CTEFreeLock(&ConnTCB->tcb_lock, TableHandle);
                    return TDI_PENDING;
                } else {
                    // He's already closing. This should be harmless, but check
                    // this case.
                    CTEFreeLock(&ConnTCB->tcb_lock, TCBHandle);
                }
            }
            Status = TDI_PENDING;

        } else {
            // We have a connection that we can close. Finish the close.
            Conn->tc_rtn = DummyCmplt;
            CloseDone(Conn, TableHandle);
            return TDI_SUCCESS;
        }

        CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), TableHandle);

    } else
        Status = TDI_INVALID_CONNECTION;

    // We're done with the connection. Go ahead and free him.
    //

    return Status;

}

//* TdiAssociateAddress - Associate an address with a connection.
//
//  Called to associate an address with a connection. We do a minimal
//  amount of sanity checking, and then put the connection on the AddrObj's
//  list.
//
//  Input:  Request         - Pointer to request structure for this request.
//          AddrHandle      - Address handle to associate connection with.
//
//  Returns: Status of attempt to associate.
//
TDI_STATUS
TdiAssociateAddress(PTDI_REQUEST Request, HANDLE AddrHandle)
{
    CTELockHandle TableHandle, AOHandle;
    AddrObj *AO;
    uint ConnID = PtrToUlong(Request->Handle.ConnectionContext);
    TCPConn *Conn;
    TDI_STATUS Status;

     DEBUGMSG(DBG_TRACE && DBG_TDI,
         (DTEXT("+TdiAssociateAddress(%x, %x) Conn %x\n"),
          Request, AddrHandle, Request->Handle.ConnectionContext));

    AO = (AddrObj *) AddrHandle;
    CTEStructAssert(AO, ao);

    if (!AO_VALID(AO)) {
        DEBUGMSG(DBG_ERROR && DBG_TDI, (DTEXT("TdiAssociateAddress: Invalid AO %x\n"), AO));
        return TDI_INVALID_PARAMETER;
    }
    Conn = GetConnFromConnID(ConnID, &TableHandle);
    CTEGetLock(&AO->ao_lock, &AOHandle);

    if (Conn != NULL) {
        CTEStructAssert(Conn, tc);

        if (Conn->tc_ao != NULL) {
            // It's already associated. Error out.
            ASSERT(0);
            DEBUGMSG(DBG_ERROR && DBG_TDI,
                (DTEXT("TdiAssociateAddress: Already assoc Addr %x conn %x\n"),
                 AO, Conn));
            Status = TDI_ALREADY_ASSOCIATED;
        } else {
            Conn->tc_ao = AO;
            ASSERT(Conn->tc_tcb == NULL);
            //ENQUEUE(&AO->ao_idleq, &Conn->tc_q);
            PUSHQ(&AO->ao_idleq, &Conn->tc_q);
            Status = TDI_SUCCESS;
        }

        CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), AOHandle);
        CTEFreeLock(&AO->ao_lock, TableHandle);
        return Status;
    } else {
        DEBUGMSG(DBG_ERROR && DBG_TDI, (DTEXT("TdiAssociateAddress: Invalid ConnID %x\n"), ConnID));
        Status = TDI_INVALID_CONNECTION;
    }

    CTEFreeLock(&AO->ao_lock, AOHandle);

    DEBUGMSG(DBG_TRACE && DBG_TDI,
         (DTEXT("-TdiAssociateAddress [%x]\n"), Status));

    return Status;
}

//* TdiDisAssociateAddress - Disassociate a connection from an address.
//
//  The TDI entry point to disassociate a connection from an address. The
//  connection must actually be associated  and not connected to anything.
//
//  Input:  Request         - Pointer to the request structure for this
//                              command.
//
//  Returns: Status of request.
//
TDI_STATUS
TdiDisAssociateAddress(PTDI_REQUEST Request)
{
    uint ConnID = PtrToUlong(Request->Handle.ConnectionContext);
    CTELockHandle AOTableHandle, ConnTableHandle, AOHandle;
    TCPConn *Conn;
    AddrObj *AO;
    TDI_STATUS Status;

    CTEGetLock(&AddrObjTableLock.Lock, &AOTableHandle);

    Conn = GetConnFromConnID(ConnID, &ConnTableHandle);

    if (Conn != NULL) {
        // The connection actually exists!

        CTEStructAssert(Conn, tc);
        AO = Conn->tc_ao;
        if (AO != NULL) {
            CTEStructAssert(AO, ao);
            // And it's associated.
            CTEGetLock(&AO->ao_lock, &AOHandle);
            // If there's no connection currently active, go ahead and remove
            // him from the AddrObj. If a connection is active error the
            // request out.
            if (Conn->tc_tcb == NULL) {
                if (Conn->tc_refcnt == 0) {
                    RemoveConnFromAO(AO, Conn);
                    Status = TDI_SUCCESS;
                } else {
                    // He shouldn't be closing, or we couldn't have found him.
                    ASSERT(!(Conn->tc_flags & CONN_CLOSING));

                    Conn->tc_rtn = Request->RequestNotifyObject;
                    Conn->tc_rtncontext = Request->RequestContext;
                    Conn->tc_donertn = DisassocDone;
                    Conn->tc_flags |= CONN_DISACC;
                    Status = TDI_PENDING;
                }

            } else
                Status = TDI_CONNECTION_ACTIVE;
            CTEFreeLock(&AO->ao_lock, AOHandle);
        } else
            Status = TDI_NOT_ASSOCIATED;

        CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), ConnTableHandle);
    } else
        Status = TDI_INVALID_CONNECTION;

    CTEFreeLock(&AddrObjTableLock.Lock, AOTableHandle);

    return Status;

}

//* ProcessUserOptions - Process options from the user.
//
//  A utility routine to process options from the user. We fill in the
//  optinfo structure, and if we have options we call ip to check on them.
//
//  Input:  Info            - Info structure containing options to be processed.
//          OptInfo         - Info structure to be filled in.
//
//  Returns: TDI_STATUS of attempt.
//
TDI_STATUS
ProcessUserOptions(PTDI_CONNECTION_INFORMATION Info, IPOptInfo * OptInfo)
{
    TDI_STATUS Status;

    (*LocalNetInfo.ipi_initopts) (OptInfo);

    if (Info != NULL && Info->Options != NULL) {
        IP_STATUS OptStatus;

        OptStatus = (*LocalNetInfo.ipi_copyopts) (Info->Options,
                                                  Info->OptionsLength, OptInfo);
        if (OptStatus != IP_SUCCESS) {
            if (OptStatus == IP_NO_RESOURCES)
                Status = TDI_NO_RESOURCES;
            else
                Status = TDI_BAD_OPTION;
        } else
            Status = TDI_SUCCESS;
    } else {
        Status = TDI_SUCCESS;
    }

    return Status;

}

//* InitTCBFromConn - Initialize a TCB from information in a Connection.
//
//  Called from Connect and Listen processing to initialize a new TCB from
//  information in the connection. We assume the AddrObjTableLock and
//  ConnTableLocks are held when we are called, or that the caller has some
//  other way of making sure that the referenced AO doesn't go away in the middle
//      of operation.
//
//  Input:  Conn            - Connection to initialize from.
//          NewTCB          - TCB to be initialized.
//          Addr            - Remote addressing and option info for NewTCB.
//                      AOLocked                - True if the called has the address object locked.
//
//  Returns: TDI_STATUS of init attempt.
//
TDI_STATUS
InitTCBFromConn(TCPConn * Conn, TCB * NewTCB,
                PTDI_CONNECTION_INFORMATION Addr, uint AOLocked)
{
    CTELockHandle AOHandle;
    TDI_STATUS Status;
    int tos = 0;
    uint UnicastIf;

    CTEStructAssert(Conn, tc);

    // We have a connection. Make sure it's associated with an address and
    // doesn't already have a TCB attached.

    if (Conn->tc_flags & CONN_INVALID)
        return TDI_INVALID_CONNECTION;

    if (Conn->tc_tcb == NULL) {
        AddrObj *ConnAO;

        ConnAO = Conn->tc_ao;
        if (ConnAO != NULL) {
            CTEStructAssert(ConnAO, ao);

            if (!AOLocked) {
                CTEGetLock(&ConnAO->ao_lock, &AOHandle);
            }
            if (!(NewTCB->tcb_fastchk & TCP_FLAG_ACCEPT_PENDING)) {
               NewTCB->tcb_saddr = ConnAO->ao_addr;
               NewTCB->tcb_defaultwin = Conn->tc_window;
               NewTCB->tcb_rcvwin = Conn->tc_window;
               // Compute rcv window scale  based on the rcvwin
               // From RFC 1323 - TCP_MAX_WINSHIFT is set to 14
               NewTCB->tcb_rcvwinscale = 0;
               if (TcpHostOpts & TCP_FLAG_WS) {

                  while ((NewTCB->tcb_rcvwinscale < TCP_MAX_WINSHIFT) &&
                       ((TCP_MAXWIN << NewTCB->tcb_rcvwinscale) < (int)Conn->tc_window)) {
                        NewTCB->tcb_rcvwinscale++;

                  }
               }
            }

            NewTCB->tcb_sport = ConnAO->ao_port;
            NewTCB->tcb_rcvind = ConnAO->ao_rcv;
            NewTCB->tcb_chainedrcvind = ConnAO->ao_chainedrcv;
            NewTCB->tcb_chainedrcvcontext = ConnAO->ao_chainedrcvcontext;
            NewTCB->tcb_ricontext = ConnAO->ao_rcvcontext;
            if (NewTCB->tcb_rcvind == NULL)
                NewTCB->tcb_rcvhndlr = PendData;
            else
                NewTCB->tcb_rcvhndlr = IndicateData;

            NewTCB->tcb_conncontext = Conn->tc_context;
            NewTCB->tcb_flags |= Conn->tc_tcbflags;
#if TRACE_EVENT
            NewTCB->tcb_cpcontext = Conn->tc_owningpid;
#endif

            if (Conn->tc_flags & CONN_WINSET)
                NewTCB->tcb_flags |= WINDOW_SET;

            if (NewTCB->tcb_flags & KEEPALIVE) {
                START_TCB_TIMER_R(NewTCB, KA_TIMER, Conn->tc_tcbkatime);
                NewTCB->tcb_kacount = 0;
            }
            IF_TCPDBG(TCP_DEBUG_OPTIONS) {
                TCPTRACE((
                          "setting TOS to %d on AO %lx in TCB %lx\n", ConnAO->ao_opt.ioi_tos, ConnAO, NewTCB
                         ));
            }

            if (ConnAO->ao_opt.ioi_tos) {
                tos = ConnAO->ao_opt.ioi_tos;
            }

            UnicastIf = ConnAO->ao_opt.ioi_ucastif;

            if (!AOLocked) {
                CTEFreeLock(&ConnAO->ao_lock, AOHandle);
            }
            // If we've been given options, we need to process them now.
            if (Addr != NULL && Addr->Options != NULL)
                NewTCB->tcb_flags |= CLIENT_OPTIONS;
            Status = ProcessUserOptions(Addr, &NewTCB->tcb_opt);

            if (tos) {
                NewTCB->tcb_opt.ioi_tos = (uchar) tos;
            }
            NewTCB->tcb_opt.ioi_ucastif = UnicastIf;

            return Status;
        } else
            return TDI_NOT_ASSOCIATED;
    } else
        return TDI_CONNECTION_ACTIVE;

}


//* AdjustAckParameters - Initializes the ACK related parameters on a TCB.
//
//  A utility routine to initialize and adjust the ACK parameters on a 
//  new TCB, with its tcb_rce field pointing to the RCE it is supposed to 
//  use.
//
//  Input:  NewTCB          - TCB with RCE initialized.
//
//  Returns: Nothing.
//
FORCEINLINE
VOID
AdjustAckParameters(TCB *NewTCB)
{
    NewTCB->tcb_delackticks = NewTCB->tcb_rce->rce_TcpDelAckTicks;

    if (NewTCB->tcb_rce->rce_TcpAckFrequency) {
        NewTCB->tcb_numdelacks = NewTCB->tcb_rce->rce_TcpAckFrequency - 1;
    }

    // If the user setting says the number of delayed ack ticks is
    // less than the default (which is also the minimum), then, 
    // they basically intend to turn delayed-acknowledgement off.
    // We achieve that by setting the segments we wait for before
    // sending an ACK to 0.
    if (NewTCB->tcb_rce->rce_TcpDelAckTicks < DEL_ACK_TICKS) {
        NewTCB->tcb_numdelacks = 0;
    }
}


//* UdpConnect - Establish a pseudo udp connection
//
//  The TDI connection establishment routine. Called when the client wants to
//  establish a udp connection,  we validate his incoming parameters
//  initialize AO to point to a udp conection information block
//
//
//  Input:  Request             - The request structure for this command.
//          Timeout             - How long to wait for the request. The format
//                                  of this time is system specific - we use
//                                 a macro to convert to ticks.
//          RequestAddr         - Pointer to a TDI_CONNECTION_INFORMATION
//                                  structure describing the destination.
//          ReturnAddr          - Pointer to where to return information.
//
//  Returns: Status of attempt to connect.
//
TDI_STATUS
UDPConnect(PTDI_REQUEST Request, void *TO,
           PTDI_CONNECTION_INFORMATION RequestAddr,
           PTDI_CONNECTION_INFORMATION ReturnAddr)
{

    AddrObj *AO;
    TDI_STATUS Status;
    PTDI_CONNECTION_INFORMATION ConInf;
    CTELockHandle AOHandle;
    IPAddr DestAddr;
    ushort DestPort;
    uchar AddrType;
    IPAddr SrcAddr;
    ushort MSS;
    IPOptInfo *OptInfo;
    IPAddr OrigSrc;

    // First, get and validate the remote address.
    if (RequestAddr == NULL || RequestAddr->RemoteAddress == NULL ||
        !GetAddress((PTRANSPORT_ADDRESS) RequestAddr->RemoteAddress, &DestAddr,
                    &DestPort))
        return TDI_BAD_ADDR;

    AddrType = (*LocalNetInfo.ipi_getaddrtype) (DestAddr);

    if (AddrType == DEST_INVALID)
        return TDI_BAD_ADDR;

    AO = (AddrObj *) Request->Handle.AddressHandle;

    //Save the connection information for the later use.

    if (AO != NULL) {
        CTEGetLock(&AO->ao_lock, &AOHandle);
        CTEStructAssert(AO, ao);
        RtlCopyMemory(&AO->ao_udpconn, RequestAddr, sizeof(TDI_CONNECTION_INFORMATION));

        if (AO->ao_RemoteAddress) {
            CTEFreeMem(AO->ao_RemoteAddress);
        }
        if (AO->ao_Options) {
            CTEFreeMem(AO->ao_Options);
        }
        if (AO->ao_udpconn.RemoteAddressLength) {

            IF_TCPDBG(TCP_DEBUG_CONUDP)
                KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"Allocating remote address %d\n", AO->ao_udpconn.RemoteAddressLength));

            AO->ao_RemoteAddress = CTEAllocMemN(AO->ao_udpconn.RemoteAddressLength, 'aPCT');
            if (!AO->ao_RemoteAddress) {
                IF_TCPDBG(TCP_DEBUG_CONUDP)
                    KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"UDPConnect: remote address alloc failed\n"));
                CTEFreeLock(&AO->ao_lock, AOHandle);
                return TDI_NO_RESOURCES;

            }
            RtlCopyMemory(AO->ao_RemoteAddress, RequestAddr->RemoteAddress, RequestAddr->RemoteAddressLength);
        }
        if (AO->ao_udpconn.OptionsLength) {

            IF_TCPDBG(TCP_DEBUG_CONUDP)
                KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"Allocating options %d\n", AO->ao_udpconn.OptionsLength));
            AO->ao_Options = CTEAllocMemN(AO->ao_udpconn.OptionsLength, 'aPCT');
            if (!AO->ao_Options) {
                KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"UDPConnect: options alloc failed\n"));
                CTEFreeLock(&AO->ao_lock, AOHandle);
                return TDI_NO_RESOURCES;

            }
            RtlCopyMemory(AO->ao_Options, RequestAddr->Options, AO->ao_udpconn.OptionsLength);
        } else {

            AO->ao_Options = 0;
        }

        AO->ao_udpconn.RemoteAddress = AO->ao_RemoteAddress;
        AO->ao_udpconn.Options = AO->ao_Options;

        if (!CLASSD_ADDR(DestAddr)) {
            OrigSrc = AO->ao_addr;
            OptInfo = &AO->ao_opt;
        } else {
            OrigSrc = AO->ao_mcastaddr;
            OptInfo = &AO->ao_mcastopt;
        }

        SrcAddr = (*LocalNetInfo.ipi_openrce) (DestAddr,
                                               OrigSrc, &AO->ao_rce, &AddrType, &MSS,
                                               OptInfo);

        if (IP_ADDR_EQUAL(SrcAddr, NULL_IP_ADDR)) {
            // The request failed. We know the destination is good
            // (we verified it above), so it must be unreachable.
            IF_TCPDBG(TCP_DEBUG_CONUDP)
                KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"UDPConnect: OpenRCE Failed\n"));
            CTEFreeLock(&AO->ao_lock, AOHandle);
            return TDI_DEST_UNREACHABLE;
        }
        IF_TCPDBG(TCP_DEBUG_CONUDP)
            KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"UDPConnect---AO %x OpenRCE %x\n", AO, AO->ao_rce));

        AO->ao_rcesrc = SrcAddr;

        //indicate that connection structure for udp is setup

        SET_AO_CONNUDP(AO);

        CTEFreeLock(&AO->ao_lock, AOHandle);

        return TDI_SUCCESS;

    }
    return TDI_ADDR_INVALID;

}

//* UdpDisconnect - remve the "connection" info from AO
//
//  Called when the client wants to
//  break a udp connection,  we validate his incoming parameters
//  initialize AO to point to a udp conection information block
//
//
//  Input:  Request             - The request structure for this command.
//          Timeout             - How long to wait for the request. The format
//                                  of this time is system specific - we use
//                                 a macro to convert to ticks.
//          RequestAddr         - Pointer to a TDI_CONNECTION_INFORMATION
//                                  structure describing the destination.
//          ReturnAddr          - Pointer to where to return information.
//
//  Returns: Status of attempt to connect.
//
TDI_STATUS
UDPDisconnect(PTDI_REQUEST Request, void *TO,
              PTDI_CONNECTION_INFORMATION RequestAddr,
              PTDI_CONNECTION_INFORMATION ReturnAddr)
{

    AddrObj *AO;
    TDI_STATUS Status;
    PTDI_CONNECTION_INFORMATION ConInf;
    CTELockHandle AOHandle;
    IPAddr DestAddr;
    ushort DestPort;
    uchar AddrType;
    IPAddr SrcAddr;
    ushort MSS;

    AO = (AddrObj *) Request->Handle.AddressHandle;

    //Save the connection information for the later use.

    if (AO != NULL) {
        CTEGetLock(&AO->ao_lock, &AOHandle);
        CTEStructAssert(AO, ao);

        IF_TCPDBG(TCP_DEBUG_CONUDP)
            KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"UDPDisconnect: Closerce %x \n", AO->ao_rce));
        if (AO->ao_rce)
            (*LocalNetInfo.ipi_closerce) (AO->ao_rce);
        AO->ao_rce = NULL;

        if (AO->ao_RemoteAddress) {
            IF_TCPDBG(TCP_DEBUG_CONUDP)
                KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"udpdisc: deleting remoteaddress %x %x\n", AO, AO->ao_RemoteAddress));
            CTEFreeMem(AO->ao_RemoteAddress);

            AO->ao_RemoteAddress = NULL;

        }
        if (AO->ao_Options) {
            IF_TCPDBG(TCP_DEBUG_CONUDP)
                KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"udpdisc: deleting remoteaddress %x %x\n", AO, AO->ao_Options));
            CTEFreeMem(AO->ao_Options);

            AO->ao_Options = NULL;
        }
        CLEAR_AO_CONNUDP(AO);
        CTEFreeLock(&AO->ao_lock, AOHandle);

        return TDI_SUCCESS;

    }
    return TDI_ADDR_INVALID;

}


//* TdiConnect - Establish a connection.
//
//  The TDI connection establishment routine. Called when the client wants to
//  establish a connection, we validate his incoming parameters and kick
//  things off by sending a SYN.
//
//  Input:  Request             - The request structure for this command.
//          Timeout             - How long to wait for the request. The format
//                                  of this time is system specific - we use
//                                  a macro to convert to ticks.
//          RequestAddr         - Pointer to a TDI_CONNECTION_INFORMATION
//                                  structure describing the destination.
//          ReturnAddr          - Pointer to where to return information.
//
//  Returns: Status of attempt to connect.
//
TDI_STATUS
TdiConnect(PTDI_REQUEST Request, void *TO,
           PTDI_CONNECTION_INFORMATION RequestAddr,
           PTDI_CONNECTION_INFORMATION ReturnAddr)
{
    TCPConnReq *ConnReq;        // Connection request to use.
    IPAddr DestAddr;
    ushort DestPort;
    uchar AddrType;
    TCPConn *Conn;
    TCB *NewTCB;
    uint ConnID = PtrToUlong(Request->Handle.ConnectionContext);
    CTELockHandle AOTableHandle, ConnTableHandle, AOHandle;
    AddrObj *AO;
    TDI_STATUS Status;
    CTELockHandle TCBHandle;
    IPAddr SrcAddr;
    ushort MSS;
    TCP_TIME *Timeout;

    // First, get and validate the remote address.
    if (RequestAddr == NULL || RequestAddr->RemoteAddress == NULL ||
        !GetAddress((PTRANSPORT_ADDRESS) RequestAddr->RemoteAddress, &DestAddr,
                    &DestPort))
        return TDI_BAD_ADDR;

    AddrType = (*LocalNetInfo.ipi_getaddrtype) (DestAddr);

    if (AddrType == DEST_INVALID || IS_BCAST_DEST(AddrType) || DestPort == 0)
        return TDI_BAD_ADDR;

    // Now get a connection request. If we can't, bail out now.
    ConnReq = GetConnReq();
    if (ConnReq == NULL)
        return TDI_NO_RESOURCES;

    // Get a TCB, assuming we'll need one.
    NewTCB = AllocTCB();
    if (NewTCB == NULL) {
        // Couldn't get a TCB.
        FreeConnReq(ConnReq);
        return TDI_NO_RESOURCES;
    }
    Timeout = (TCP_TIME *) TO;

    if (Timeout != NULL && !INFINITE_CONN_TO(*Timeout)) {
        ulong Ticks = TCP_TIME_TO_TICKS(*Timeout);
        if (Ticks > MAX_CONN_TO_TICKS)
            Ticks = MAX_CONN_TO_TICKS;
        else
            Ticks++;
        ConnReq->tcr_timeout = (ushort) Ticks;
    } else
        ConnReq->tcr_timeout = 0;

    ConnReq->tcr_conninfo = ReturnAddr;
    ConnReq->tcr_addrinfo = NULL;
    ConnReq->tcr_req.tr_rtn = Request->RequestNotifyObject;
    ConnReq->tcr_req.tr_context = Request->RequestContext;
    NewTCB->tcb_daddr = DestAddr;
    NewTCB->tcb_dport = DestPort;

    // Now find the real connection. If we find it, we'll make sure it's
    // associated.
    CTEGetLock(&AddrObjTableLock.Lock, &AOTableHandle);
    Conn = GetConnFromConnID(ConnID, &ConnTableHandle);
    if (Conn != NULL) {
        uint Inserted;

        CTEStructAssert(Conn, tc);

        AO = Conn->tc_ao;

        if (AO != NULL) {
            CTEGetLock(&AO->ao_lock, &AOHandle);

            CTEStructAssert(AO, ao);
            Status = InitTCBFromConn(Conn, NewTCB, RequestAddr, TRUE);

            NewTCB->tcb_numdelacks = 1;
            NewTCB->tcb_rcvdsegs = 0;

            if (Status == TDI_SUCCESS) {

                // We've processed the options, and we know the destination
                // address is good, and we have all the resources we need,
                // so we can go ahead and open an RCE. If this works we'll
                // put the TCB into the Connection and send a SYN.

                // We're done with the AddrObjTable now, so we can free it's
                // lock.
                NewTCB->tcb_flags |= ACTIVE_OPEN;

                CTEFreeLock(&AddrObjTableLock.Lock, AOHandle);

                SrcAddr = (*LocalNetInfo.ipi_openrce)(DestAddr,
                                                      NewTCB->tcb_saddr,
                                                      &NewTCB->tcb_rce,
                                                      &AddrType, &MSS,
                                                      &NewTCB->tcb_opt);

                if (IP_ADDR_EQUAL(SrcAddr, NULL_IP_ADDR)) {
                    // The request failed. We know the destination is good
                    // (we verified it above), so it must be unreachable.
                    CTEFreeLock(&AO->ao_lock, ConnTableHandle);
                    CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), AOTableHandle);
                    Status = TDI_DEST_UNREACHABLE;
                    goto error;
                }
                if (AddrType == DEST_LOCAL) {
                    NewTCB->tcb_flags &= ~NAGLING;
                    // Ack every segment for loopback
                    NewTCB->tcb_numdelacks = 0;
                }
                //Check if we have per adapter specific window size.

                if (NewTCB->tcb_rce->rce_TcpWindowSize) {

                    if (NewTCB->tcb_rce->rce_TcpWindowSize <= GlobalMaxRcvWin) {

                        NewTCB->tcb_defaultwin =
                            NewTCB->tcb_rce->rce_TcpWindowSize;
                    } else {

                        NewTCB->tcb_defaultwin = GlobalMaxRcvWin;
                    }
                    NewTCB->tcb_rcvwin = NewTCB->tcb_defaultwin;

                    // Compute *new* rcv window scale  based on the rcvwin
                    // note that we had already done this in initTcbfromConn
                    // But it is not based on per adapter window size.
                    // From RFC 1323 - TCP_MAX_WINSHIFT is set to 14
                    NewTCB->tcb_rcvwinscale = 0;
                    if (TcpHostOpts & TCP_FLAG_WS) {

                        while ((NewTCB->tcb_rcvwinscale < TCP_MAX_WINSHIFT) &&
                               ((TCP_MAXWIN << NewTCB->tcb_rcvwinscale) <
                                    (int)NewTCB->tcb_defaultwin)) {
                            NewTCB->tcb_rcvwinscale++;
                        }
                    }
                }

                AdjustAckParameters(NewTCB);

                // OK, the RCE open worked. Enter the TCB into the connection.
                CTEGetLock(&NewTCB->tcb_lock, &TCBHandle);
                Conn->tc_tcb = NewTCB;

                NewTCB->tcb_connid = Conn->tc_connid;
                Conn->tc_refcnt++;
                NewTCB->tcb_conn = Conn;
                REMOVEQ(&Conn->tc_q);

                ENQUEUE(&AO->ao_activeq, &Conn->tc_q);

                // This is outgoing connect request
                // ISN will not be grabbed twice

#if MILLEN
                //just use tcb_sendnext to hold hash value
                //for randisn
                NewTCB->tcb_sendnext =
                    TCB_HASH(NewTCB->tcb_daddr, NewTCB->tcb_dport,
                             NewTCB->tcb_saddr, NewTCB->tcb_sport);
#endif

                GetRandomISN(&NewTCB->tcb_sendnext);

                CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), TCBHandle);
                CTEFreeLock(&AO->ao_lock, ConnTableHandle);

                // If the caller didn't specify a local address, use what
                // IP provided.
                if (IP_ADDR_EQUAL(NewTCB->tcb_saddr, NULL_IP_ADDR))
                    NewTCB->tcb_saddr = SrcAddr;

                // Until we have MTU discovery in place, hold the MSS down
                // to 536 if we're going off net.
                MSS -= sizeof(TCPHeader);

                if (!PMTUDiscovery && IS_OFFNET_DEST(AddrType)) {
                    NewTCB->tcb_mss = MIN(MSS, MAX_REMOTE_MSS) -
                        NewTCB->tcb_opt.ioi_optlength;

                    ASSERT(NewTCB->tcb_mss > 0);
                } else {
                    if (PMTUDiscovery)
                        NewTCB->tcb_opt.ioi_flags = IP_FLAG_DF;
                    NewTCB->tcb_mss = MSS - NewTCB->tcb_opt.ioi_optlength;

                    ASSERT(NewTCB->tcb_mss > 0);
                }

                ValidateMSS(NewTCB);

                //
                // Initialize the remote mss in case we receive an MTU change
                // from IP before the remote SYN arrives. The remmms will
                // be replaced when the remote SYN is processed.
                //
                NewTCB->tcb_remmss = NewTCB->tcb_mss;

                // Now initialize our send state.
                InitSendState(NewTCB);
                NewTCB->tcb_refcnt = 0;
                REFERENCE_TCB(NewTCB);
                NewTCB->tcb_state = TCB_SYN_SENT;
                TStats.ts_activeopens++;

#if TRACE_EVENT
                NewTCB->tcb_cpcontext = HandleToUlong(PsGetCurrentProcessId());
#endif

                // Need to put the ConnReq on the TCB now,
                // in case the timer fires after we've inserted.

                NewTCB->tcb_connreq = ConnReq;
                CTEFreeLock(&NewTCB->tcb_lock, AOTableHandle);

                Inserted = InsertTCB(NewTCB);
                CTEGetLock(&NewTCB->tcb_lock, &TCBHandle);

                if (!Inserted) {
                    // Insert failed. We must already have a connection. Pull
                    // the connreq from the TCB first, so we can return the
                    // correct error code for it.
                    NewTCB->tcb_connreq = NULL;
                    DEREFERENCE_TCB(NewTCB);
                    TryToCloseTCB(NewTCB, TCB_CLOSE_ABORTED, TCBHandle);
                    FreeConnReq(ConnReq);
                    return TDI_ADDR_IN_USE;
                }
                // If it's closing somehow, stop now. It can't have gone to
                // closed, as we hold a reference on it. It could have gone
                // to some other state (for example SYN-RCVD) so we need to
                // check that now too.
                if (!CLOSING(NewTCB) && NewTCB->tcb_state == TCB_SYN_SENT) {
                    if (ConnReq->tcr_timeout > 0) {
                        START_TCB_TIMER_R(NewTCB, CONN_TIMER, ConnReq->tcr_timeout);
                    }
                    SendSYN(NewTCB, TCBHandle);
                    CTEGetLock(&NewTCB->tcb_lock, &TCBHandle);
                }
                DerefTCB(NewTCB, TCBHandle);

                return TDI_PENDING;
            } else
                CTEFreeLock(&AO->ao_lock, AOHandle);

        } else
            Status = TDI_NOT_ASSOCIATED;

        CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), ConnTableHandle);
    } else
        Status = TDI_INVALID_CONNECTION;

    CTEFreeLock(&AddrObjTableLock.Lock, AOTableHandle);
  error:
    //CTEFreeLock(&ConnTableLock, AOTableHandle);
    FreeConnReq(ConnReq);
    FreeTCB(NewTCB);
    return Status;

}

//* TdiListen - Listen for a connection.
//
//  The TDI listen handling routine. Called when the client wants to
//  post a listen, we validate his incoming parameters, allocate a TCB
//  and return.
//
//  Input:  Request             - The request structure for this command.
//          Flags               - Listen flags for the listen.
//          AcceptableAddr      - Pointer to a TDI_CONNECTION_INFORMATION
//                                  structure describing acceptable remote
//                                  addresses.
//          ConnectedAddr       - Pointer to where to return information
//                                  about the address we connected to.
//
//  Returns: Status of attempt to connect.
//
TDI_STATUS
TdiListen(PTDI_REQUEST Request, ushort Flags,
          PTDI_CONNECTION_INFORMATION AcceptableAddr,
          PTDI_CONNECTION_INFORMATION ConnectedAddr)
{
    TCPConnReq *ConnReq;        // Connection request to use.
    IPAddr RemoteAddr;            // Remote address to take conn. from.
    ushort RemotePort;            // Acceptable remote port.
    uchar AddrType;                // Type of remote address.
    TCPConn *Conn;                // Pointer to the Connection being
    // listened upon.
    TCB *NewTCB;                // Pointer to the new TCB we'll use.
    uint ConnID = PtrToUlong(Request->Handle.ConnectionContext);
    CTELockHandle AOTableHandle, ConnTableHandle;
    TDI_STATUS Status;

    // If we've been given remote addressing criteria, check it out.
    if (AcceptableAddr != NULL && AcceptableAddr->RemoteAddress != NULL) {
        if (!GetAddress((PTRANSPORT_ADDRESS) AcceptableAddr->RemoteAddress,
                        &RemoteAddr, &RemotePort))
            return TDI_BAD_ADDR;

        if (!IP_ADDR_EQUAL(RemoteAddr, NULL_IP_ADDR)) {
            AddrType = (*LocalNetInfo.ipi_getaddrtype) (RemoteAddr);

            if (AddrType == DEST_INVALID || IS_BCAST_DEST(AddrType))
                return TDI_BAD_ADDR;
        }
    } else {
        RemoteAddr = NULL_IP_ADDR;
        RemotePort = 0;
    }

    // The remote address is valid. Get a ConnReq, and maybe a TCB.
    ConnReq = GetConnReq();
    if (ConnReq == NULL)
        return TDI_NO_RESOURCES;    // Couldn't get one.

    // Now try to get a TCB.
    NewTCB = AllocTCB();
    if (NewTCB == NULL) {
        // Couldn't get a TCB. Return an error.
        FreeConnReq(ConnReq);
        return TDI_NO_RESOURCES;
    }
    // We have the resources we need. Initialize them, and then check the
    // state of the connection.
    ConnReq->tcr_flags =
        (Flags & TDI_QUERY_ACCEPT) ? TCR_FLAG_QUERY_ACCEPT : 0;
    ConnReq->tcr_conninfo = ConnectedAddr;
    ConnReq->tcr_addrinfo = NULL;
    ConnReq->tcr_req.tr_rtn = Request->RequestNotifyObject;
    ConnReq->tcr_req.tr_context = Request->RequestContext;
    NewTCB->tcb_connreq = ConnReq;
    NewTCB->tcb_daddr = RemoteAddr;
    NewTCB->tcb_dport = RemotePort;
    NewTCB->tcb_state = TCB_LISTEN;

    // Now find the real connection. If we find it, we'll make sure it's
    // associated.
    //CTEGetLock(&ConnTableLock, &ConnTableHandle);
    Conn = GetConnFromConnID(ConnID, &ConnTableHandle);
    if (Conn != NULL) {
        CTELockHandle AddrHandle;
        AddrObj *ConnAO;

        CTEStructAssert(Conn, tc);
        // We have a connection. Make sure it's associated with an address and
        // doesn't already have a TCB attached.
        ConnAO = Conn->tc_ao;

        if (ConnAO != NULL) {
            CTEStructAssert(ConnAO, ao);
            CTEGetLockAtDPC(&ConnAO->ao_lock, &AddrHandle);

            if (AO_VALID(ConnAO)) {
                Status = InitTCBFromConn(Conn, NewTCB, AcceptableAddr, TRUE);
            } else {
                Status = TDI_ADDR_INVALID;
            }

            if (Status == TDI_SUCCESS) {

                // The initialization worked. Assign the new TCB to the connection,
                // and return.

                REMOVEQ(&Conn->tc_q);
                //ENQUEUE(&ConnAO->ao_listenq, &Conn->tc_q);
                PUSHQ(&ConnAO->ao_listenq, &Conn->tc_q);

                Conn->tc_tcb = NewTCB;
                NewTCB->tcb_conn = Conn;
                NewTCB->tcb_connid = Conn->tc_connid;
                Conn->tc_refcnt++;

                ConnAO->ao_listencnt++;
                CTEFreeLockFromDPC(&ConnAO->ao_lock, AddrHandle);

                Status = TDI_PENDING;
            } else {
                FreeTCB(NewTCB);
                CTEFreeLockFromDPC(&ConnAO->ao_lock, AddrHandle);
            }
        } else {
            FreeTCB(NewTCB);
            Status = TDI_NOT_ASSOCIATED;
        }

        CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), ConnTableHandle);
    } else {
        FreeTCB(NewTCB);
        Status = TDI_INVALID_CONNECTION;
    }

    // We're all done. Free the locks and get out.
    //CTEFreeLock(&ConnTableLock, ConnTableHandle);
    return Status;

}


//* InitRCE - Initialize an RCE.
//
//  A utility routine to open and RCE and determine the maximum segment size
//  for a connections. This function is called with the TCB lock held
//  when transitioning out of the SYN_SENT or LISTEN states.
//
//  Input:  NewTCB          - TCB for which an RCE is to be opened.
//
//  Returns: Nothing.
//
void
InitRCE(TCB * NewTCB)
{
    uchar DType;
    ushort MSS;

    // Open an RCE for this connection.
    // postpone getting an RCE for this until gotpoestab,
    // if in synattackprotect mode.

    if (SynAttackProtect && NewTCB->tcb_state == TCB_SYN_RCVD &&
        TCPHalfOpen > TCPMaxHalfOpen) {

        (*LocalNetInfo.ipi_openrce)(NewTCB->tcb_daddr, NewTCB->tcb_saddr,
                                    NULL, &DType, &MSS, &NewTCB->tcb_opt);
    } else {

        (*LocalNetInfo.ipi_openrce)(NewTCB->tcb_daddr, NewTCB->tcb_saddr,
                                    &NewTCB->tcb_rce, &DType, &MSS,
                                    &NewTCB->tcb_opt);
    }

    NewTCB->tcb_numdelacks = 1;
    NewTCB->tcb_rcvdsegs = 0;

    if (NewTCB->tcb_rce) {
        if (NewTCB->tcb_rce->rce_TcpWindowSize) {

            if (NewTCB->tcb_rce->rce_TcpWindowSize <= GlobalMaxRcvWin) {
                NewTCB->tcb_defaultwin = NewTCB->tcb_rce->rce_TcpWindowSize;
            } else if (NewTCB->tcb_defaultwin > GlobalMaxRcvWin) {
                NewTCB->tcb_defaultwin = GlobalMaxRcvWin;
            }
            NewTCB->tcb_rcvwin = NewTCB->tcb_defaultwin;

            // Compute *new* rcv window scale  based on the rcvwin
            // note that we had already done this in initTcbfromConn
            // But it is not based on per adapter window size.
            // From RFC 1323 - TCP_MAX_WINSHIFT is set to 14

            NewTCB->tcb_rcvwinscale = 0;
            if (TcpHostOpts & TCP_FLAG_WS) {

                while ((NewTCB->tcb_rcvwinscale < TCP_MAX_WINSHIFT) &&
                       ((TCP_MAXWIN << NewTCB->tcb_rcvwinscale) <
                            (int)NewTCB->tcb_defaultwin)) {
                    NewTCB->tcb_rcvwinscale++;
                }
            }
        }

        AdjustAckParameters(NewTCB);
    } //if rce != NULL

    if (DType == DEST_LOCAL) {
        // Ack every segment for loopback
        NewTCB->tcb_numdelacks = 0;
        NewTCB->tcb_flags &= ~NAGLING;
    }
    // Until we have Dynamic MTU discovery in place, force MTU down.
    MSS -= sizeof(TCPHeader);
    if (!PMTUDiscovery && (DType & DEST_OFFNET_BIT)) {
        NewTCB->tcb_mss = MIN(NewTCB->tcb_remmss, MIN(MSS, MAX_REMOTE_MSS)
                              - NewTCB->tcb_opt.ioi_optlength);

        ASSERT(NewTCB->tcb_mss > 0);
    } else {
        if (PMTUDiscovery)
            NewTCB->tcb_opt.ioi_flags = IP_FLAG_DF;
        MSS -= NewTCB->tcb_opt.ioi_optlength;
        NewTCB->tcb_mss = MIN(NewTCB->tcb_remmss, MSS);

        ASSERT(NewTCB->tcb_mss > 0);

    }

    ValidateMSS(NewTCB);
}

//* ValidateMSS - Enforce restrictions on the MSS selected for a TCB.
//
//  Called to enforce the minimum acceptable value of the MSS for a TCB.
//  In the case where an MSS has been selected which drops below the minimum,
//  the minimum is chosen and the dont-fragment flag is cleared to allow
//  fragmentation. Assumes the TCB is locked by the caller.
//
//  Input:  MssTCB          - TCB to be validated.
//
//  Returns: Nothing.
//
void
ValidateMSS(TCB* MssTCB)
{
    if ((MssTCB->tcb_mss + MssTCB->tcb_opt.ioi_optlength) < MIN_LOCAL_MSS) {
        MssTCB->tcb_mss = MIN_LOCAL_MSS - MssTCB->tcb_opt.ioi_optlength;
        MssTCB->tcb_opt.ioi_flags &= ~IP_FLAG_DF;
    }
}

//* AcceptConn - Accept a connection on a TCB.
//
//  Called to accept a connection on a TCB, either from an incoming
//  receive segment or via a user's accept. We initialize the RCE
//  and the send state, and send out a SYN. We assume the TCB is locked
//  and referenced when we get it.
//
//  Input:  AcceptTCB       - TCB to accept on.
//          Handle          - Lock handle for TCB.
//
//  Returns: Nothing.
//
void
AcceptConn(TCB * AcceptTCB, CTELockHandle Handle)
{
    CTEStructAssert(AcceptTCB, tcb);
    ASSERT(AcceptTCB->tcb_refcnt != 0);

    InitRCE(AcceptTCB);
    InitSendState(AcceptTCB);

    AdjustRcvWin(AcceptTCB);

    SendSYN(AcceptTCB, Handle);

    CTEGetLock(&AcceptTCB->tcb_lock, &Handle);

    DerefTCB(AcceptTCB, Handle);
}

//* TdiAccept - Accept a connection.
//
//  The TDI accept routine. Called when the client wants to
//  accept a connection for which a listen had previously completed. We
//  examine the state of the connection - it has to be in SYN-RCVD, with
//  a TCB, with no pending connreq, etc.
//
//  Input:  Request             - The request structure for this command.
//          AcceptInfo          - Pointer to a TDI_CONNECTION_INFORMATION
//                                  structure describing option information
//                                  for this accept.
//          ConnectedIndo       - Pointer to where to return information
//                                  about the address we connected to.
//
//  Returns: Status of attempt to connect.
//
TDI_STATUS
TdiAccept(PTDI_REQUEST Request, PTDI_CONNECTION_INFORMATION AcceptInfo,
          PTDI_CONNECTION_INFORMATION ConnectedInfo)
{
    TCPConnReq          *ConnReq;       // ConnReq for this connection.
    uint                ConnID = PtrToUlong(Request->Handle.ConnectionContext);
    TCPConn             *Conn;          // Connection being accepted upon.
    TCB                 *AcceptTCB;     // TCB for Conn.
    CTELockHandle       ConnTableHandle;// Lock handle for connection table.
    CTELockHandle       TCBHandle;      // Lock handle for TCB.
    TDI_STATUS          Status;

    // First, get the ConnReq we'll need.
    ConnReq = GetConnReq();
    if (ConnReq == NULL)
        return TDI_NO_RESOURCES;

    ConnReq->tcr_conninfo = ConnectedInfo;
    ConnReq->tcr_addrinfo = NULL;
    ConnReq->tcr_req.tr_rtn = Request->RequestNotifyObject;
    ConnReq->tcr_req.tr_context = Request->RequestContext;
    ConnReq->tcr_flags = 0;

    // Now look up the connection.
    //CTEGetLock(&ConnTableLock, &ConnTableHandle);
    Conn = GetConnFromConnID(ConnID, &ConnTableHandle);
    if (Conn != NULL) {
        CTEStructAssert(Conn, tc);

        // We have the connection. Make sure is has a TCB, and that the
        // TCB is in the SYN-RCVD state, etc.
        AcceptTCB = Conn->tc_tcb;

        if (AcceptTCB != NULL) {
            CTEStructAssert(AcceptTCB, tcb);

            // Grab random ISN
            // Note that if CONN was pre accepted we would'nt be here
            // So, we are not getting ISN twice.
#if MILLEN
            //just use tcb_sendnext to hold hash value
            //for randisn
            AcceptTCB->tcb_sendnext = TCB_HASH(AcceptTCB->tcb_daddr, AcceptTCB->tcb_dport, AcceptTCB->tcb_saddr, AcceptTCB->tcb_sport);

#endif

            GetRandomISN(&AcceptTCB->tcb_sendnext);

            CTEGetLock(&AcceptTCB->tcb_lock, &TCBHandle);
            CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), TCBHandle);

            if (!CLOSING(AcceptTCB) && AcceptTCB->tcb_state == TCB_SYN_RCVD) {
                // State is valid. Make sure this TCB had a delayed accept on
                // it, and that there is currently no connect request pending.
                if (!(AcceptTCB->tcb_flags & CONN_ACCEPTED) &&
                    AcceptTCB->tcb_connreq == NULL) {

                    // If the caller gave us options, they'll override any
                    // that are already present, if they're valid.
                    if (AcceptInfo != NULL) {
                        if (AcceptInfo->Options != NULL) {
                            IPOptInfo TempOptInfo;
    
                            // We have options. Copy them to make sure they're
                            // valid.
                            Status = ProcessUserOptions(AcceptInfo,
                                                        &TempOptInfo);
                            if (Status == TDI_SUCCESS) {
                                (*LocalNetInfo.ipi_freeopts) (&AcceptTCB->tcb_opt);
                                AcceptTCB->tcb_opt = TempOptInfo;
                                AcceptTCB->tcb_flags |= CLIENT_OPTIONS;
                            } else
                                goto connerror;
                        }
                        if (AcceptInfo->RemoteAddress) {
                            ConnReq->tcr_addrinfo = AcceptInfo;
                        }
                    }
                    AcceptTCB->tcb_connreq = ConnReq;
                    AcceptTCB->tcb_flags |= CONN_ACCEPTED;
                    REFERENCE_TCB(AcceptTCB);
                    // Everything's set. Accept the connection now.
                    AcceptConn(AcceptTCB, ConnTableHandle);

#if TRACE_EVENT
                    AcceptTCB->tcb_cpcontext = HandleToUlong(PsGetCurrentProcessId());
#endif
                    return TDI_PENDING;
                }
            }
          connerror:
            CTEFreeLock(&AcceptTCB->tcb_lock, ConnTableHandle);
            Status = TDI_INVALID_CONNECTION;
            goto error;
        }
        CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), ConnTableHandle);
    }
    Status = TDI_INVALID_CONNECTION;
    //CTEFreeLock(&ConnTableLock, ConnTableHandle);

  error:
    FreeConnReq(ConnReq);
    return Status;

}

//* TdiDisConnect - Disconnect a connection.
//
//  The TDI disconnection routine. Called when the client wants to disconnect
//  a connection. There are two types of disconnection we support, graceful
//  and abortive. A graceful close will cause us to send a FIN and not complete
//  the request until we get the ACK back. An abortive close causes us to send
//  a RST. In that case we'll just get things going and return immediately.
//
//  Input:  Request             - The request structure for this command.
//          Timeout             - How long to wait for the request. The format
//                                  of this time is system specific - we use
//                                  a macro to convert to ticks.
//          Flags               - Flags indicating type of disconnect.
//          DiscConnInfo        - Pointer to a TDI_CONNECTION_INFORMATION
//                                  structure giving disconnection info. Ignored
//                                  for this request.
//          ReturnInfo          - Pointer to where to return information.
//                                  Ignored for this request.
//
//  Returns: Status of attempt to disconnect.
//
TDI_STATUS
TdiDisconnect(PTDI_REQUEST Request, void *TO, ushort Flags,
              PTDI_CONNECTION_INFORMATION DiscConnInfo,
              PTDI_CONNECTION_INFORMATION ReturnInfo)
{
    TCPConnReq *ConnReq;        // Connection request to use.
    TCPConn *Conn;
    TCB *DiscTCB;
    CTELockHandle ConnTableHandle, TCBHandle;
    TDI_STATUS Status;
    TCP_TIME *Timeout;

    //CTEGetLock(&ConnTableLock, &ConnTableHandle);

    Conn = GetConnFromConnID(PtrToUlong(Request->Handle.ConnectionContext), &ConnTableHandle);

    if (Conn != NULL) {
        CTEStructAssert(Conn, tc);

        DiscTCB = Conn->tc_tcb;

        if (DiscTCB != NULL) {

            CTEStructAssert(DiscTCB, tcb);
            CTEGetLock(&DiscTCB->tcb_lock, &TCBHandle);

            // We have the TCB. See what kind of disconnect this is.
            if (Flags & TDI_DISCONNECT_ABORT) {
                // This is an abortive disconnect. If we're not already
                // closed or closing, blow the connection away.
                if (DiscTCB->tcb_state != TCB_CLOSED) {
                    CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), TCBHandle);

                    if (!CLOSING(DiscTCB)) {
                        DiscTCB->tcb_flags |= NEED_RST;
                        TryToCloseTCB(DiscTCB, TCB_CLOSE_ABORTED,
                                      ConnTableHandle);
                    } else
                        CTEFreeLock(&DiscTCB->tcb_lock, ConnTableHandle);

                    return TDI_SUCCESS;
                } else {
                    // The TCB isn't connected.
                    CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), TCBHandle);

                    CTEFreeLock(&DiscTCB->tcb_lock, ConnTableHandle);
                    return TDI_INVALID_STATE;
                }
            } else {
                // This is not an abortive close. For graceful close we'll need
                // a ConnReq.
                CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), TCBHandle);

                // Make sure we aren't in the middle of an abortive close.
                if (CLOSING(DiscTCB)) {
                    CTEFreeLock(&DiscTCB->tcb_lock, ConnTableHandle);
                    return TDI_INVALID_CONNECTION;
                }
                ConnReq = GetConnReq();
                if (ConnReq != NULL) {
                    // Got the ConnReq. See if this is a DISCONNECT_WAIT
                    // primitive or not.

                    ConnReq->tcr_flags = 0;
                    ConnReq->tcr_conninfo = NULL;
                    ConnReq->tcr_addrinfo = NULL;
                    ConnReq->tcr_req.tr_rtn = Request->RequestNotifyObject;
                    ConnReq->tcr_req.tr_context = Request->RequestContext;

                    if (!(Flags & TDI_DISCONNECT_WAIT)) {
                        Timeout = (TCP_TIME *) TO;

                        if (Timeout != NULL && !INFINITE_CONN_TO(*Timeout)) {
                            ulong Ticks = TCP_TIME_TO_TICKS(*Timeout);
                            if (Ticks > MAX_CONN_TO_TICKS)
                                Ticks = MAX_CONN_TO_TICKS;
                            else
                                Ticks++;
                            ConnReq->tcr_timeout = (ushort) Ticks;
                        } else
                            ConnReq->tcr_timeout = 0;

                        // OK, we're just about set. We need to update the TCB
                        // state, and send the FIN.
                        if (DiscTCB->tcb_state == TCB_ESTAB) {
                            DiscTCB->tcb_state = TCB_FIN_WAIT1;

                            // Since we left established, we're off the fast
                            // receive path.
                            DiscTCB->tcb_slowcount++;
                            DiscTCB->tcb_fastchk |= TCP_FLAG_SLOW;
                        } else if (DiscTCB->tcb_state == TCB_CLOSE_WAIT)
                            DiscTCB->tcb_state = TCB_LAST_ACK;
                        else {
                            CTEFreeLock(&DiscTCB->tcb_lock, ConnTableHandle);
                            FreeConnReq(ConnReq);
                            return TDI_INVALID_STATE;
                        }

                        TStats.ts_currestab--;    // Update SNMP info.


                        ASSERT(DiscTCB->tcb_connreq == NULL);
                        DiscTCB->tcb_connreq = ConnReq;
                        if (ConnReq->tcr_timeout > 0) {
                            START_TCB_TIMER_R(DiscTCB, CONN_TIMER, ConnReq->tcr_timeout);
                        }
                        DiscTCB->tcb_flags |= FIN_NEEDED;
                        REFERENCE_TCB(DiscTCB);
                        TCPSend(DiscTCB, ConnTableHandle);
                        return TDI_PENDING;
                    } else {
                        // This is a DISC_WAIT request.
                        ConnReq->tcr_timeout = 0;
                        if (DiscTCB->tcb_discwait == NULL) {
                            DiscTCB->tcb_discwait = ConnReq;
                            Status = TDI_PENDING;
                        } else
                            Status = TDI_INVALID_STATE;

                        CTEFreeLock(&DiscTCB->tcb_lock, ConnTableHandle);
                        return Status;
                    }
                } else {
                    // Couldn't get a ConnReq.
                    CTEFreeLock(&DiscTCB->tcb_lock, ConnTableHandle);
                    return TDI_NO_RESOURCES;
                }
            }
        } else
            CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), ConnTableHandle);
    }
    // No Conn, or no TCB on conn. Return an error.
    //CTEFreeLock(&ConnTableLock, ConnTableHandle);
    return TDI_INVALID_CONNECTION;
}

//* OKToNotify - See if it's OK to notify about a DISC.
//
//  A little utility function, called to see it it's OK to notify the client
//  of an incoming FIN.
//
//  Input: NotifyTCB    - TCB to check.
//
//  Returns: TRUE if it's OK, False otherwise.
//
uint
OKToNotify(TCB * NotifyTCB)
{
    CTEStructAssert(NotifyTCB, tcb);
    if (NotifyTCB->tcb_pendingcnt == 0 && NotifyTCB->tcb_urgcnt == 0 &&
        NotifyTCB->tcb_rcvhead == NULL && NotifyTCB->tcb_exprcv == NULL)
        return TRUE;
    else
        return FALSE;
}

//* NotifyOfDisc - Notify a client that a TCB is being disconnected.
//
//  Called when we're disconnecting a TCB because we've received a FIN or
//  RST from the remote peer, or because we're aborting for some reason.
//  We'll complete a DISCONNECT_WAIT request if we have one, or try and
//  issue an indication otherwise. This is only done if we're in a synchronized
//  state and not in TIMED-WAIT.
//
//  Input:  DiscTCB         - Pointer to TCB we're notifying.
//          Status          - Status code for notification.
//
//  Returns: Nothing.
//
void
NotifyOfDisc(TCB * DiscTCB, IPOptInfo * DiscInfo, TDI_STATUS Status)
{
    CTELockHandle TCBHandle, AOTHandle, ConnTHandle;
    TCPConnReq *DiscReq;
    TCPConn *Conn;
    AddrObj *DiscAO;
    PVOID ConnContext;

    CTEStructAssert(DiscTCB, tcb);
    ASSERT(DiscTCB->tcb_refcnt != 0);

    CTEGetLock(&DiscTCB->tcb_lock, &TCBHandle);
    if (SYNC_STATE(DiscTCB->tcb_state) &&
        !(DiscTCB->tcb_flags & DISC_NOTIFIED)) {

        // We can't notify him if there's still data to be taken.
        if (Status == TDI_GRACEFUL_DISC && !OKToNotify(DiscTCB)) {
            DiscTCB->tcb_flags |= DISC_PENDING;
            CTEFreeLock(&DiscTCB->tcb_lock, TCBHandle);
            return;
        }
        DiscTCB->tcb_flags |= DISC_NOTIFIED;
        DiscTCB->tcb_flags &= ~DISC_PENDING;

        // We're in a state where a disconnect is meaningful, and we haven't
        // already notified the client.

        // See if we have a DISC-WAIT request pending.
        if ((DiscReq = DiscTCB->tcb_discwait) != NULL) {
            // We have a disconnect wait request. Complete it and we're done.
            DiscTCB->tcb_discwait = NULL;
            CTEFreeLock(&DiscTCB->tcb_lock, TCBHandle);
            (*DiscReq->tcr_req.tr_rtn) (DiscReq->tcr_req.tr_context, Status, 0);
            FreeConnReq(DiscReq);
            return;

        }
        // No DISC-WAIT. Find the AddrObj for the connection, and see if there
        // is a disconnect handler registered.

        ConnContext = DiscTCB->tcb_conncontext;
        CTEFreeLock(&DiscTCB->tcb_lock, TCBHandle);

        CTEGetLock(&AddrObjTableLock.Lock, &AOTHandle);
        //CTEGetLock(&ConnTableLock, &ConnTHandle);
        if ((Conn = DiscTCB->tcb_conn) != NULL) {

            CTEGetLock(&(Conn->tc_ConnBlock->cb_lock), &ConnTHandle);
#if DBG
            Conn->tc_ConnBlock->line = (uint) __LINE__;
            Conn->tc_ConnBlock->module = (uchar *) __FILE__;
#endif
            CTEStructAssert(Conn, tc);

            DiscAO = Conn->tc_ao;
            if (DiscAO != NULL) {
                CTELockHandle AOHandle;
                PDisconnectEvent DiscEvent;
                PVOID DiscContext;

                CTEStructAssert(DiscAO, ao);
                CTEGetLock(&DiscAO->ao_lock, &AOHandle);
                CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), AOHandle);
                CTEFreeLock(&AddrObjTableLock.Lock, ConnTHandle);

                DiscEvent = DiscAO->ao_disconnect;
                DiscContext = DiscAO->ao_disconncontext;

                if (DiscEvent != NULL) {
                    uint InfoLength;
                    PVOID Info;

                    REF_AO(DiscAO);
                    CTEFreeLock(&DiscAO->ao_lock, AOTHandle);

                    if (DiscInfo != NULL) {
                        InfoLength = (uint) DiscInfo->ioi_optlength;
                        Info = DiscInfo->ioi_options;
                    } else {
                        InfoLength = 0;
                        Info = NULL;
                    }

                    IF_TCPDBG(TCP_DEBUG_CLOSE) {
                        TCPTRACE(("TCP: indicating %s disconnect\n",
                                  (Status == TDI_GRACEFUL_DISC) ? "graceful" :
                                  "abortive"
                                 ));
                    }

                    (*DiscEvent) (DiscContext,
                                  ConnContext, 0,
                                  NULL, InfoLength, Info, (Status == TDI_GRACEFUL_DISC) ?
                                  TDI_DISCONNECT_RELEASE : TDI_DISCONNECT_ABORT);

                    DELAY_DEREF_AO(DiscAO);
                    return;
                } else {
                    CTEFreeLock(&DiscAO->ao_lock, AOTHandle);
                    return;
                }
            }
            CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), ConnTHandle);
        }
        CTEFreeLock(&AddrObjTableLock.Lock, AOTHandle);
        return;

    }
    CTEFreeLock(&DiscTCB->tcb_lock, TCBHandle);

}

//* GracefulClose - Complete the transition to a gracefully closed state.
//
//  Called when we need to complete the transition to a gracefully closed
//  state, either TIME_WAIT or CLOSED. This completion involves removing
//  the TCB from it's associated connection (if it has one), notifying the
//  upper layer client either via completing a request or calling a disc.
//  notification handler, and actually doing the transition.
//
//  The tricky part here is if we need to notify him (instead of completing
//  a graceful disconnect request). We can't notify him if there is pending
//  data on the connection, so in that case we have to pend the disconnect
//  notification until we deliver the data.
//
//  Input:  CloseTCB        - TCB to transition.
//          ToTimeWait      - True if we're going to TIME_WAIT, False if
//                              we're going to close the TCB.
//          Notify          - True if we're going to transition via notification,
//                              False if we're going to transition by completing
//                              a disconnect request.
//          Handle          - Lock handle for TCB.
//
//  Returns: Nothing.
//
void
GracefulClose(TCB * CloseTCB, uint ToTimeWait, uint Notify, CTELockHandle Handle)
{
    CTEStructAssert(CloseTCB, tcb);
    ASSERT(CloseTCB->tcb_refcnt != 0);

    // First, see if we need to notify the client of a FIN.
    if (Notify) {
#if DBG
        if (CloseTCB->tcb_fastchk & TCP_FLAG_SEND_AND_DISC) {
            KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"Notifying on S&D %x\n", CloseTCB));
            DbgBreakPoint();
        }
#endif

        // We do need to notify him. See if it's OK to do so.
        if (OKToNotify(CloseTCB)) {
            // We can notify him. Change his state, pull him from the conn.,
            // and notify him.
            if (ToTimeWait) {
                // Save the time we went into time wait, in case we need to
                // scavenge.
                //CloseTCB->tcb_alive = CTESystemUpTime();
                CloseTCB->tcb_state = TCB_TIME_WAIT;
                //take care rcvind if this is on delay q.
                CloseTCB->tcb_rcvind = NULL;

                CTEFreeLock(&CloseTCB->tcb_lock, Handle);

            } else {
                // He's going to close. Mark him as closing with TryToCloseTCB
                // (he won't actually close since we have a ref. on him). We
                // do this so that anyone touching him after we free the
                // lock will fail.
                TryToCloseTCB(CloseTCB, TDI_SUCCESS, Handle);
            }

            RemoveTCBFromConn(CloseTCB);
            NotifyOfDisc(CloseTCB, NULL, TDI_GRACEFUL_DISC);

        } else {
            // Can't notify him now. Set the appropriate flags, and return.
            CloseTCB->tcb_flags |= (GC_PENDING | (ToTimeWait ? TW_PENDING : 0));
            DerefTCB(CloseTCB, Handle);
            return;
        }
    } else {
        // We're not notifying this guy, we just need to complete a conn. req.
        // We need to check and see if he's been notified, and if not
        // we'll complete the request and notify him later.
        if ((CloseTCB->tcb_flags & DISC_NOTIFIED)
            || (CloseTCB->tcb_fastchk & TCP_FLAG_SEND_AND_DISC)) {
            // He's been notified.
            if (ToTimeWait) {
                // Save the time we went into time wait, in case we need to
                // scavenge.
                //CloseTCB->tcb_alive = CTESystemUpTime();
                CloseTCB->tcb_state = TCB_TIME_WAIT;
                CloseTCB->tcb_rcvind = NULL;

                CTEFreeLock(&CloseTCB->tcb_lock, Handle);

            } else {
                // Mark him as closed. See comments above.
                TryToCloseTCB(CloseTCB, TDI_SUCCESS, Handle);
            }

            RemoveTCBFromConn(CloseTCB);

            CTEGetLock(&CloseTCB->tcb_lock, &Handle);

            if (CloseTCB->tcb_fastchk & TCP_FLAG_SEND_AND_DISC) {

                if (!EMPTYQ(&CloseTCB->tcb_sendq)) {

                    TCPReq *Req;
                    TCPSendReq *SendReq;
                    uint Result;

                    DEQUEUE(&CloseTCB->tcb_sendq, Req, TCPReq, tr_q);

                    CTEStructAssert(Req, tr);
                    SendReq = (TCPSendReq *) Req;
                    CTEStructAssert(SendReq, tsr);

                    ASSERT(SendReq->tsr_flags & TSR_FLAG_SEND_AND_DISC);

                    CTEFreeLock(&CloseTCB->tcb_lock, Handle);

                    // Decrement the initial reference put on the buffer when it was
                    // allocated. This reference would have been decremented if the
                    // send had been acknowledged, but then the send would not still
                    // be on the tcb_sendq.

                    SendReq->tsr_req.tr_status = TDI_SUCCESS;

                    Result = CTEInterlockedDecrementLong(&(SendReq->tsr_refcnt));

                    if (Result <= 1) {
                        // If we've sent directly from this send, NULL out the next
                        // pointer for the last buffer in the chain.
                        CloseTCB->tcb_flags |= DISC_NOTIFIED;
                        if (SendReq->tsr_lastbuf != NULL) {
                            NDIS_BUFFER_LINKAGE(SendReq->tsr_lastbuf) = NULL;
                            SendReq->tsr_lastbuf = NULL;
                        }
                        //KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"GC: Completing %x %x %x\n",
                        //         SendReq, Req->tr_context, CloseTCB));
                        (*Req->tr_rtn) (Req->tr_context, TDI_SUCCESS, SendReq->tsr_size);
                        FreeSendReq(SendReq);
                    }
                } else {
                    CTEFreeLock(&CloseTCB->tcb_lock, Handle);
                    KdPrintEx((DPFLTR_TCPIP_ID, DPFLTR_INFO_LEVEL,"S&D empty sendq %x\n", CloseTCB));
                    ASSERT(FALSE);
                }

            } else {

                CompleteConnReq(CloseTCB, NULL, TDI_SUCCESS);
                CTEFreeLock(&CloseTCB->tcb_lock, Handle);
            }

        } else {
            // He hasn't been notified. He should be pending already.
            ASSERT(CloseTCB->tcb_flags & DISC_PENDING);
            CloseTCB->tcb_flags |= (GC_PENDING | (ToTimeWait ? TW_PENDING : 0));

            CompleteConnReq(CloseTCB, NULL, TDI_SUCCESS);

            DerefTCB(CloseTCB, Handle);
            return;
        }
    }

    // If we're going to TIME_WAIT, start the TIME_WAIT timer now.
    // Otherwise close the TCB.
    CTEGetLock(&CloseTCB->tcb_lock, &Handle);
    if (!CLOSING(CloseTCB) && ToTimeWait) {
        CTEFreeLock(&CloseTCB->tcb_lock, Handle);
        RemoveConnFromTCB(CloseTCB);

        //at this point ref_cnt should be 1
        //tcb_pending should be 0

        if (!RemoveAndInsert(CloseTCB)) {
            ASSERT(0);
        }

        return;
    }
    DerefTCB(CloseTCB, Handle);

}

//* ConnCheckPassed - Check to see if we have exceeded the connect limit
//
//  Called when a SYN is received to determine whether we will accept
//  the incoming connection. If the is an empty slot or if the IPAddr
//  is already in the table, we accept it.
//
//  Input: Source Address of incoming connection
//         Destination port of incoming connection
//
//  Returns: TRUE is connect is to be accepted
//           FALSE if connection is rejected
//
int
ConnCheckPassed(IPAddr Src, ulong Prt)
{
    UNREFERENCED_PARAMETER(Src);
    UNREFERENCED_PARAMETER(Prt);

    return TRUE;
}

void
InitAddrChecks()
{
    return;
}

//* EnumerateConnectionList - Enumerate Connection List database.
//
//  This routine enumerates the contents of the connection limit database
//
//  Input:
//
//          Buffer            - A pointer to a buffer into which to put
//                              the returned connection list entries.
//
//          BufferSize        - On input, the size in bytes of Buffer.
//                              On output, the number of bytes written.
//
//          EntriesAvailable  - On output, the total number of connection entries
//                              available in the database.
//
//  Returns: A TDI status code:
//
//           TDI_SUCCESS otherwise.
//
//  NOTES:
//
//      This routine acquires AddrObjTableLock.
//
//      Entries written to output buffer are in host byte order.
//
void
EnumerateConnectionList(uchar * Buffer, ulong BufferSize,
                        ulong * EntriesReturned, ulong * EntriesAvailable)
{

    UNREFERENCED_PARAMETER(Buffer);
    UNREFERENCED_PARAMETER(BufferSize);

    *EntriesAvailable = 0;
    *EntriesReturned = 0;

    return;
}

#pragma BEGIN_INIT

//* InitTCPConn - Initialize TCP connection management code.
//
//  Called during init time to initialize our TCP connection mgmt..
//
//  Input: Nothing.
//
//  Returns: TRUE.
//
int
InitTCPConn(void)
{
    TcpConnPool = PplCreatePool(
                    TcpConnAllocate,
                    TcpConnFree,
                    0,
                    sizeof(TCPConn),
                    'CPCT',
                    0);

    if (!TcpConnPool) {
        return FALSE;
    }

    CTEInitLock(&ConnTableLock);
    return TRUE;
}

//* UnInitTCPConn - Uninitialize our connection management code.
//
//  Called if initialization fails to uninitialize our conn mgmet.
//
//
//  Input:  Nothing.
//
//  Returns: Nothing.
//
void
UnInitTCPConn(void)
{
    PplDestroyPool(TcpConnPool);
}

#pragma END_INIT