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windows-nt/Source/XPSP1/NT/net/tcpip/driver/tcp/tcpdeliv.c

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2020-09-26 03:20:57 -05:00
/********************************************************************/
/** Microsoft LAN Manager **/
/** Copyright(c) Microsoft Corp., 1990-2000 **/
/********************************************************************/
/* :ts=4 */
//** TCPDELIV.C - TCP deliver data code.
//
// This file contains the code for delivering data to the user, including
// putting data into recv. buffers and calling indication handlers.
//
#include "precomp.h"
#include "addr.h"
#include "tcp.h"
#include "tcb.h"
#include "tcprcv.h"
#include "tcpsend.h"
#include "tcpconn.h"
#include "tcpdeliv.h"
#include "tlcommon.h"
#include "tcpipbuf.h"
#include "pplasl.h"
#include "mdl2ndis.h"
extern TCPConnBlock **ConnTable;
extern HANDLE TcpRequestPool;
extern BOOLEAN
PutOnRAQ(TCB * RcvTCB, TCPRcvInfo * RcvInfo, IPRcvBuf * RcvBuf, uint Size);
NTSTATUS
TCPPrepareIrpForCancel(
PTCP_CONTEXT TcpContext,
PIRP Irp,
PDRIVER_CANCEL CancelRoutine
);
ULONG
TCPGetMdlChainByteCount(
PMDL Mdl
);
NTSTATUS
TCPDataRequestComplete(
void *Context,
unsigned int Status,
unsigned int ByteCount
);
VOID
TCPCancelRequest(
PDEVICE_OBJECT Device,
PIRP Irp
);
VOID
CompleteRcvs(TCB * CmpltTCB);
#if DBG
ULONG DbgChainedRcvPends;
ULONG DbgChainedRcvNonPends;
ULONG DbgRegularRcv;
#endif
//* FreeRcvReq - Free a rcv request structure.
//
// Called to free a rcv request structure.
//
// Input: FreedReq - Rcv request structure to be freed.
//
// Returns: Nothing.
//
__inline
VOID
FreeRcvReq(TCPRcvReq * Request)
{
CTEStructAssert(Request, trr);
PplFree(TcpRequestPool, Request);
}
//* GetRcvReq - Get a recv. request structure.
//
// Called to get a rcv. request structure.
//
// Input: Nothing.
//
// Returns: Pointer to RcvReq structure, or NULL if none.
//
__inline
TCPRcvReq *
GetRcvReq(VOID)
{
TCPRcvReq *Request;
LOGICAL FromList;
Request = PplAllocate(TcpRequestPool, &FromList);
if (Request) {
#if DBG
Request->trr_sig = trr_signature;
#endif
}
return Request;
}
//* FindLastBuffer - Find the last buffer in a chain.
//
// A utility routine to find the last buffer in an rb chain.
//
// Input: Buf - Pointer to RB chain.
//
// Returns: Pointer to last buf in chain.
//
IPRcvBuf *
FindLastBuffer(IPRcvBuf * Buf)
{
ASSERT(Buf != NULL);
while (Buf->ipr_next != NULL)
Buf = Buf->ipr_next;
return Buf;
}
//* FreePartialRB - Free part of an RB chain.
//
// Called to adjust an free part of an RB chain. We walk down the chain,
// trying to free buffers.
//
// Input: RB - RB chain to be adjusted.
// Size - Size in bytes to be freed.
//
// Returns: Pointer to adjusted RB chain.
//
IPRcvBuf *
FreePartialRB(IPRcvBuf * RB, uint Size)
{
while (Size != 0) {
IPRcvBuf *TempBuf;
ASSERT(RB != NULL);
if (Size >= RB->ipr_size) {
Size -= RB->ipr_size;
TempBuf = RB;
RB = RB->ipr_next;
if (TempBuf->ipr_owner == IPR_OWNER_TCP)
FreeTcpIpr(TempBuf);
} else {
RB->ipr_size -= Size;
RB->ipr_buffer += Size;
break;
}
}
ASSERT(RB != NULL);
return RB;
}
//* CopyRBChain - Copy a chain of IP rcv buffers.
//
// Called to copy a chain of IP rcv buffers. We don't copy a buffer if it's
// already owner by TCP. We assume that all non-TCP owned buffers start
// before any TCP owner buffers, so we quit when we copy to a TCP owner buffer.
//
// Input: OrigBuf - Buffer chain to copy from.
// LastBuf - Where to return pointer to last buffer in
// chain.
// Size - Maximum size in bytes to copy.
//
// Returns: Pointer to new buffer chain.
//
IPRcvBuf *
CopyRBChain(IPRcvBuf * OrigBuf, IPRcvBuf ** LastBuf, uint Size)
{
IPRcvBuf *FirstBuf, *EndBuf;
uint BytesToCopy;
ASSERT(OrigBuf != NULL);
ASSERT(Size > 0);
if (OrigBuf->ipr_owner != IPR_OWNER_TCP) {
BytesToCopy = MIN(Size, OrigBuf->ipr_size);
FirstBuf = AllocTcpIpr(BytesToCopy, 'BPCT');
if (FirstBuf != NULL) {
EndBuf = FirstBuf;
RtlCopyMemory(FirstBuf->ipr_buffer, OrigBuf->ipr_buffer,
BytesToCopy);
Size -= BytesToCopy;
OrigBuf = OrigBuf->ipr_next;
while (OrigBuf != NULL && OrigBuf->ipr_owner != IPR_OWNER_TCP
&& Size != 0) {
IPRcvBuf *NewBuf;
BytesToCopy = MIN(Size, OrigBuf->ipr_size);
NewBuf = AllocTcpIpr(BytesToCopy, 'BPCT');
if (NewBuf != NULL) {
RtlCopyMemory(NewBuf->ipr_buffer, OrigBuf->ipr_buffer,
BytesToCopy);
EndBuf->ipr_next = NewBuf;
EndBuf = NewBuf;
Size -= BytesToCopy;
OrigBuf = OrigBuf->ipr_next;
} else {
FreeRBChain(FirstBuf);
return NULL;
}
}
EndBuf->ipr_next = OrigBuf;
} else
return NULL;
} else {
FirstBuf = OrigBuf;
EndBuf = OrigBuf;
if (Size < OrigBuf->ipr_size)
OrigBuf->ipr_size = Size;
Size -= OrigBuf->ipr_size;
}
// Now walk down the chain, until we run out of
// Size. At this point, Size is the bytes left to 'copy' (it may be 0),
// and the sizes in buffers FirstBuf...EndBuf are correct.
while (Size != 0) {
EndBuf = EndBuf->ipr_next;
ASSERT(EndBuf != NULL);
if (Size < EndBuf->ipr_size)
EndBuf->ipr_size = Size;
Size -= EndBuf->ipr_size;
}
// If there's anything left in the chain, free it now.
if (EndBuf->ipr_next != NULL) {
FreeRBChain(EndBuf->ipr_next);
EndBuf->ipr_next = NULL;
}
*LastBuf = EndBuf;
return FirstBuf;
}
//* PendData - Pend incoming data to a client.
//
// Called when we need to buffer data for a client because there's no receive
// down and we can't indicate.
//
// The TCB lock is held throughout this procedure. If this is to be changed,
// make sure consistency of tcb_pendingcnt is preserved. This routine is
// always called at DPC level.
//
// Input: RcvTCB - TCB on which to receive the data.
// RcvFlags - TCP flags for the incoming packet.
// InBuffer - Input buffer of packet.
// Size - Size in bytes of data in InBuffer.
//
// Returns: Number of bytes of data taken.
//
uint
PendData(TCB * RcvTCB, uint RcvFlags, IPRcvBuf * InBuffer, uint Size)
{
IPRcvBuf *NewBuf, *LastBuf;
CTEStructAssert(RcvTCB, tcb);
ASSERT(Size > 0);
ASSERT(InBuffer != NULL);
ASSERT(RcvTCB->tcb_refcnt != 0);
ASSERT(RcvTCB->tcb_fastchk & TCP_FLAG_IN_RCV);
//ASSERT(RcvTCB->tcb_currcv == NULL);
ASSERT(RcvTCB->tcb_rcvhndlr == PendData);
CheckRBList(RcvTCB->tcb_pendhead, RcvTCB->tcb_pendingcnt);
NewBuf = CopyRBChain(InBuffer, &LastBuf, Size);
if (NewBuf != NULL) {
// We have a duplicate chain. Put it on the end of the
// pending q.
if (RcvTCB->tcb_pendhead == NULL) {
RcvTCB->tcb_pendhead = NewBuf;
RcvTCB->tcb_pendtail = LastBuf;
} else {
RcvTCB->tcb_pendtail->ipr_next = NewBuf;
RcvTCB->tcb_pendtail = LastBuf;
}
RcvTCB->tcb_pendingcnt += Size;
} else {
FreeRBChain(InBuffer);
Size = 0;
}
CheckRBList(RcvTCB->tcb_pendhead, RcvTCB->tcb_pendingcnt);
return Size;
}
//* BufferData - Put incoming data into client's buffer.
//
// Called when we believe we have a buffer into which we can put data. We put
// it in there, and if we've filled the buffer or the incoming data has the
// push flag set we'll mark the TCB to return the buffer. Otherwise we'll
// get out and return the data later.
//
// In NT, this routine is called with the TCB lock held, and holds it for
// the duration of the call. This is important to ensure consistency of
// the tcb_pendingcnt field. If we need to change this to free the lock
// partway through, make sure to take this into account. In particular,
// TdiReceive zeros pendingcnt before calling this routine, and this routine
// may update it. If the lock is freed in here there would be a window where
// we really do have pending data, but it's not on the list or reflected in
// pendingcnt. This could mess up our windowing computations, and we'd have
// to be careful not to end up with more data pending than our window allows.
//
// Input: RcvTCB - TCB on which to receive the data.
// RcvFlags - TCP rcv flags for the incoming packet.
// InBuffer - Input buffer of packet.
// Size - Size in bytes of data in InBuffer.
//
// Returns: Number of bytes of data taken.
//
uint
BufferData(TCB * RcvTCB, uint RcvFlags, IPRcvBuf * InBuffer, uint Size)
{
uchar *DestPtr; // Destination pointer.
uchar *SrcPtr; // Src pointer.
uint SrcSize, DestSize = 0; // Sizes of current source and
// destination buffers.
uint Copied; // Total bytes to copy.
uint BytesToCopy; // Bytes of data to copy this time.
TCPRcvReq *DestReq; // Current receive request.
IPRcvBuf *SrcBuf; // Current source buffer.
PNDIS_BUFFER DestBuf; // Current receive buffer.
uint RcvCmpltd;
uint Flags;
CTEStructAssert(RcvTCB, tcb);
ASSERT(Size > 0);
ASSERT(InBuffer != NULL);
ASSERT(RcvTCB->tcb_refcnt != 0);
ASSERT(RcvTCB->tcb_rcvhndlr == BufferData);
// In order to copy the received data to the application's buffers,
// we now need to map those buffers into the system's address space.
// Rather than attempting to map them below, where the going gets rough,
// we do it up-front where errors may be more readily handled.
//
// N.B. We map one buffer beyond what we need, since the code below
// will update the current receive-request to point beyond the data copied.
Copied = 0;
for (DestReq = RcvTCB->tcb_currcv; DestReq; DestReq = DestReq->trr_next) {
uint DestAvail = DestReq->trr_size - DestReq->trr_amt;
for (DestBuf = DestReq->trr_buffer, DestSize = DestReq->trr_offset;
DestBuf && DestAvail && Copied < Size;
DestBuf = NDIS_BUFFER_LINKAGE(DestBuf), DestSize = 0) {
if (!TcpipBufferVirtualAddress(DestBuf, NormalPagePriority)) {
return 0;
}
DestSize = MIN(NdisBufferLength(DestBuf) - DestSize, DestAvail);
DestAvail -= DestSize;
Copied += DestSize;
}
if (Copied >= Size) {
// We've mapped the space into which we'll copy;
// now map the space immediately beyond that.
if (DestAvail) {
// We believe space remains in the current receive-request;
// DestBuf should point to the current buffer.
ASSERT(DestBuf);
} else if ((DestReq = DestReq->trr_next) != NULL) {
// No more space in that receive-request, but there's another;
// Move to this next one, and map the start of that.
DestBuf = DestReq->trr_buffer;
} else {
break;
}
if (!TcpipBufferVirtualAddress(DestBuf, NormalPagePriority)) {
return 0;
}
break;
}
}
Copied = 0;
RcvCmpltd = 0;
DestReq = RcvTCB->tcb_currcv;
ASSERT(DestReq != NULL);
CTEStructAssert(DestReq, trr);
DestBuf = DestReq->trr_buffer;
DestSize = MIN(NdisBufferLength(DestBuf) - DestReq->trr_offset,
DestReq->trr_size - DestReq->trr_amt);
DestPtr = (uchar *) NdisBufferVirtualAddress(DestBuf) + DestReq->trr_offset;
SrcBuf = InBuffer;
SrcSize = SrcBuf->ipr_size;
SrcPtr = SrcBuf->ipr_buffer;
Flags = (RcvFlags & TCP_FLAG_PUSH) ? TRR_PUSHED : 0;
RcvCmpltd = Flags;
DestReq->trr_flags |= Flags;
do {
BytesToCopy = MIN(Size - Copied, MIN(SrcSize, DestSize));
RtlCopyMemory(DestPtr, SrcPtr, BytesToCopy);
Copied += BytesToCopy;
DestReq->trr_amt += BytesToCopy;
// Update our source pointers.
if ((SrcSize -= BytesToCopy) == 0) {
IPRcvBuf *TempBuf;
// We've copied everything in this buffer.
TempBuf = SrcBuf;
SrcBuf = SrcBuf->ipr_next;
if (Size != Copied) {
ASSERT(SrcBuf != NULL);
SrcSize = SrcBuf->ipr_size;
SrcPtr = SrcBuf->ipr_buffer;
}
if (TempBuf->ipr_owner == IPR_OWNER_TCP)
FreeTcpIpr(TempBuf);
} else
SrcPtr += BytesToCopy;
// Now check the destination pointer, and update it if we need to.
if ((DestSize -= BytesToCopy) == 0) {
uint DestAvail;
// Exhausted this buffer. See if there's another one.
DestAvail = DestReq->trr_size - DestReq->trr_amt;
DestBuf = NDIS_BUFFER_LINKAGE(DestBuf);
if (DestBuf != NULL && (DestAvail != 0)) {
// Have another buffer in the chain. Update things.
DestSize = MIN(NdisBufferLength(DestBuf), DestAvail);
DestPtr = (uchar *) NdisBufferVirtualAddress(DestBuf);
} else {
// No more buffers in the chain. See if we have another buffer
// on the list.
DestReq->trr_flags |= TRR_PUSHED;
// If we've been told there's to be no back traffic, get an ACK
// going right away.
if (DestReq->trr_flags & TDI_RECEIVE_NO_RESPONSE_EXP)
DelayAction(RcvTCB, NEED_ACK);
RcvCmpltd = TRUE;
DestReq = DestReq->trr_next;
if (DestReq != NULL) {
DestBuf = DestReq->trr_buffer;
DestSize = MIN(NdisBufferLength(DestBuf), DestReq->trr_size);
DestPtr = (uchar *) NdisBufferVirtualAddress(DestBuf);
// If we have more to put into here, set the flags.
if (Copied != Size)
DestReq->trr_flags |= Flags;
} else {
// All out of buffer space. Reset the data handler pointer.
break;
}
}
} else
// Current buffer not empty yet.
DestPtr += BytesToCopy;
// If we've copied all that we need to, we're done.
} while (Copied != Size);
// We've finished copying, and have a few more things to do. We need to
// update the current rcv. pointer and possibly the offset in the
// recv. request. If we need to complete any receives we have to schedule
// that. If there's any data we couldn't copy we'll need to dispose of
// it.
RcvTCB->tcb_currcv = DestReq;
if (DestReq != NULL) {
DestReq->trr_buffer = DestBuf;
DestReq->trr_offset = (uint) (DestPtr - (uchar *) NdisBufferVirtualAddress(DestBuf));
RcvTCB->tcb_rcvhndlr = BufferData;
} else
RcvTCB->tcb_rcvhndlr = PendData;
RcvTCB->tcb_indicated -= MIN(Copied, RcvTCB->tcb_indicated);
if (Size != Copied) {
IPRcvBuf *NewBuf, *LastBuf;
ASSERT(DestReq == NULL);
RcvTCB->tcb_moreflag = 1;
// We have data to dispose of. Update the first buffer of the chain
// with the current src pointer and size, and copy it.
ASSERT(SrcSize <= SrcBuf->ipr_size);
ASSERT(
((uint) (SrcPtr - SrcBuf->ipr_buffer)) ==
(SrcBuf->ipr_size - SrcSize)
);
SrcBuf->ipr_buffer = SrcPtr;
SrcBuf->ipr_size = SrcSize;
NewBuf = CopyRBChain(SrcBuf, &LastBuf, Size - Copied);
if (NewBuf != NULL) {
// We managed to copy the buffer. Push it on the pending queue.
if (RcvTCB->tcb_pendhead == NULL) {
RcvTCB->tcb_pendhead = NewBuf;
RcvTCB->tcb_pendtail = LastBuf;
} else {
LastBuf->ipr_next = RcvTCB->tcb_pendhead;
RcvTCB->tcb_pendhead = NewBuf;
}
RcvTCB->tcb_pendingcnt += Size - Copied;
Copied = Size;
CheckRBList(RcvTCB->tcb_pendhead, RcvTCB->tcb_pendingcnt);
} else
FreeRBChain(SrcBuf);
} else {
// We copied Size bytes, but the chain could be longer than that. Free
// it if we need to.
if (SrcBuf != NULL)
FreeRBChain(SrcBuf);
}
if (RcvCmpltd != 0) {
DelayAction(RcvTCB, NEED_RCV_CMPLT);
} else {
//instrumentation to catch conreq null in tcb.c
// ASSERT(DestReq);
// ASSERT(DestReq->trr_amt);
// RcvTCB->tcb_lastreq = DestReq;
START_TCB_TIMER_R(RcvTCB, PUSH_TIMER, PUSH_TO);
}
return Copied;
}
//* IndicateData - Indicate incoming data to a client.
//
// Called when we need to indicate data to an upper layer client. We'll pass
// up a pointer to whatever we have available, and the client may take some
// or all of it.
//
// Input: RcvTCB - TCB on which to receive the data.
// RcvFlags - TCP rcv flags for the incoming packet.
// InBuffer - Input buffer of packet.
// Size - Size in bytes of data in InBuffer.
//
// Returns: Number of bytes of data taken.
//
uint
IndicateData(TCB * RcvTCB, uint RcvFlags, IPRcvBuf * InBuffer, uint Size)
{
TDI_STATUS Status;
PRcvEvent Event;
PVOID EventContext, ConnContext;
uint BytesTaken = 0;
#if MILLEN
EventRcvBuffer ERB;
#else // MILLEN
EventRcvBuffer *ERB = NULL;
PTDI_REQUEST_KERNEL_RECEIVE RequestInformation;
PIO_STACK_LOCATION IrpSp;
#endif // !MILLEN
TCPRcvReq *RcvReq;
IPRcvBuf *NewBuf;
ulong IndFlags;
#if TRACE_EVENT
PTDI_DATA_REQUEST_NOTIFY_ROUTINE CPCallBack;
WMIData WMIInfo;
#endif
IPRcvBuf *LastBuf;
DEBUGMSG(DBG_TRACE && DBG_TDI, (DTEXT("+IndicateData\n")));
CTEStructAssert(RcvTCB, tcb);
ASSERT(Size > 0);
ASSERT(InBuffer != NULL);
ASSERT(RcvTCB->tcb_refcnt != 0);
ASSERT(RcvTCB->tcb_fastchk & TCP_FLAG_IN_RCV);
ASSERT(RcvTCB->tcb_rcvind != NULL);
ASSERT(RcvTCB->tcb_rcvhead == NULL);
ASSERT(RcvTCB->tcb_rcvhndlr == IndicateData);
Event = RcvTCB->tcb_rcvind;
EventContext = RcvTCB->tcb_ricontext;
ConnContext = RcvTCB->tcb_conncontext;
if (Size < InBuffer->ipr_size) {
uint NewRcvWin;
NewRcvWin = RcvWin(RcvTCB);
Size = MIN(InBuffer->ipr_size, NewRcvWin);
}
RcvTCB->tcb_indicated = Size;
RcvTCB->tcb_flags |= IN_RCV_IND;
IF_TCPDBG(TCP_DEBUG_RECEIVE) {
TCPTRACE((
"Indicating %lu bytes, %lu available\n",
InBuffer->ipr_size, Size
));
}
#if TCP_FLAG_PUSH >= TDI_RECEIVE_ENTIRE_MESSAGE
IndFlags = TDI_RECEIVE_COPY_LOOKAHEAD | TDI_RECEIVE_NORMAL |
TDI_RECEIVE_AT_DISPATCH_LEVEL |
((RcvFlags & TCP_FLAG_PUSH) >>
((TCP_FLAG_PUSH / TDI_RECEIVE_ENTIRE_MESSAGE) - 1));
#else
IndFlags = TDI_RECEIVE_COPY_LOOKAHEAD | TDI_RECEIVE_NORMAL |
TDI_RECEIVE_AT_DISPATCH_LEVEL |
((RcvFlags & TCP_FLAG_PUSH) <<
((TDI_RECEIVE_ENTIRE_MESSAGE / TCP_FLAG_PUSH) - 1));
#endif
#if DBG
DbgRegularRcv++;
#endif
if (InBuffer->ipr_pMdl && RcvTCB->tcb_chainedrcvind) {
PChainedRcvEvent ChainedEvent = RcvTCB->tcb_chainedrcvind;
CTEFreeLockFromDPC(&RcvTCB->tcb_lock, NULL);
ASSERT(InBuffer->ipr_size == Size);
Status = (*ChainedEvent) (RcvTCB->tcb_chainedrcvcontext, ConnContext,
IndFlags, InBuffer->ipr_size, InBuffer->ipr_RcvOffset,
InBuffer->ipr_pMdl, InBuffer->ipr_RcvContext);
#if TRACE_EVENT
CPCallBack = TCPCPHandlerRoutine;
if ((CPCallBack != NULL) && (Size > 0)) {
ulong GroupType;
WMIInfo.wmi_destaddr = RcvTCB->tcb_daddr;
WMIInfo.wmi_destport = RcvTCB->tcb_dport;
WMIInfo.wmi_srcaddr = RcvTCB->tcb_saddr;
WMIInfo.wmi_srcport = RcvTCB->tcb_sport;
WMIInfo.wmi_size = Size;
WMIInfo.wmi_context = RcvTCB->tcb_cpcontext;
GroupType = EVENT_TRACE_GROUP_TCPIP + EVENT_TRACE_TYPE_RECEIVE;
(*CPCallBack) (GroupType, (PVOID) &WMIInfo, sizeof(WMIInfo), NULL);
}
#endif
if (Status == STATUS_PENDING) {
*InBuffer->ipr_pClientCnt = 1; //indicate to the ndis that
#if DBG
DbgChainedRcvPends++;
#endif
} else if (Status == TDI_SUCCESS) {
*InBuffer->ipr_pClientCnt = 0;
#if DBG
DbgChainedRcvNonPends++;
#endif
}
CTEGetLockAtDPC(&RcvTCB->tcb_lock, NULL);
RcvTCB->tcb_indicated = 0;
RcvTCB->tcb_flags &= ~IN_RCV_IND;
if (Status == TDI_NOT_ACCEPTED) {
BytesTaken = 0;
if ((RcvTCB->tcb_rcvhead != NULL) && (RcvTCB->tcb_currcv != NULL)) {
RcvTCB->tcb_rcvhndlr = BufferData;
//ASSERT(RcvTCB->tcb_rcvhndlr == BufferData);
BytesTaken += BufferData(RcvTCB, RcvFlags, InBuffer,
Size - BytesTaken);
} else {
// Need to copy the chain and pend the data.
RcvTCB->tcb_rcvhndlr = PendData;
NewBuf = CopyRBChain(InBuffer, &LastBuf, Size - BytesTaken);
if (NewBuf != NULL) {
// We have a duplicate chain. Push it on the front of the
// pending q.
if (RcvTCB->tcb_pendhead == NULL) {
RcvTCB->tcb_pendhead = NewBuf;
RcvTCB->tcb_pendtail = LastBuf;
} else {
LastBuf->ipr_next = RcvTCB->tcb_pendhead;
RcvTCB->tcb_pendhead = NewBuf;
}
RcvTCB->tcb_pendingcnt += Size - BytesTaken;
BytesTaken = Size;
RcvTCB->tcb_moreflag = 3;
} else {
FreeRBChain(InBuffer);
}
}
return BytesTaken;
}
return Size;
}
if (!Event) {
// This is to safeguard against a timing window between the
// time NEED_RST is set and the tcb gets closed.
FreeRBChain(InBuffer);
return 0;
}
RcvReq = GetRcvReq();
if (RcvReq != NULL) {
// The indicate handler is saved in the TCB. Just call up into it.
CTEFreeLockFromDPC(&RcvTCB->tcb_lock, NULL);
Status = (*Event) (EventContext, ConnContext,
IndFlags, InBuffer->ipr_size, Size, &BytesTaken,
InBuffer->ipr_buffer, &ERB);
IF_TCPDBG(TCP_DEBUG_RECEIVE) {
TCPTRACE(("%lu bytes taken, status %lx\n", BytesTaken, Status));
}
// See what the client did. If the return status is MORE_PROCESSING,
// we've been given a buffer. In that case put it on the front of the
// buffer queue, and if all the data wasn't taken go ahead and copy
// it into the new buffer chain.
//
// Note that the size and buffer chain we're concerned with here is
// the one that we passed to the client. Since we're in a rcv. handler,
// any data that has come in would have been put on the reassembly
// queue.
#if TRACE_EVENT
CPCallBack = TCPCPHandlerRoutine;
if ((CPCallBack != NULL) && (BytesTaken > 0)) {
ulong GroupType;
WMIInfo.wmi_destaddr = RcvTCB->tcb_daddr;
WMIInfo.wmi_destport = RcvTCB->tcb_dport;
WMIInfo.wmi_srcaddr = RcvTCB->tcb_saddr;
WMIInfo.wmi_srcport = RcvTCB->tcb_sport;
WMIInfo.wmi_size = BytesTaken;
WMIInfo.wmi_context = RcvTCB->tcb_cpcontext;
GroupType = EVENT_TRACE_GROUP_TCPIP + EVENT_TRACE_TYPE_RECEIVE;
(*CPCallBack) (GroupType, (PVOID)&WMIInfo, sizeof(WMIInfo), NULL);
}
#endif
if (Status == TDI_MORE_PROCESSING) {
#if !MILLEN
ASSERT(ERB != NULL);
IrpSp = IoGetCurrentIrpStackLocation(ERB);
Status = TCPPrepareIrpForCancel(
(PTCP_CONTEXT) IrpSp->FileObject->FsContext,
ERB,
TCPCancelRequest
);
if (NT_SUCCESS(Status)) {
PNDIS_BUFFER pNdisBuffer;
Status = ConvertMdlToNdisBuffer(ERB, ERB->MdlAddress, &pNdisBuffer);
ASSERT(Status == TDI_SUCCESS);
RequestInformation = (PTDI_REQUEST_KERNEL_RECEIVE)
& (IrpSp->Parameters);
RcvReq->trr_rtn = TCPDataRequestComplete;
RcvReq->trr_context = ERB;
RcvReq->trr_buffer = pNdisBuffer;
RcvReq->trr_size = RequestInformation->ReceiveLength;
RcvReq->trr_uflags = (ushort *)
& (RequestInformation->ReceiveFlags);
RcvReq->trr_flags = (uint) (RequestInformation->ReceiveFlags);
RcvReq->trr_offset = 0;
RcvReq->trr_amt = 0;
#else // !MILLEN
if (1) {
RcvReq->trr_rtn = ERB.erb_rtn;
RcvReq->trr_context = ERB.erb_context;
RcvReq->trr_buffer = ERB.erb_buffer;
RcvReq->trr_size = ERB.erb_size;
RcvReq->trr_uflags = ERB.erb_flags;
CTEAssert(ERB.erb_flags != NULL);
RcvReq->trr_flags = (uint) (*ERB.erb_flags);
RcvReq->trr_offset = 0;
RcvReq->trr_amt = 0;
#endif // MILLEN
CTEGetLockAtDPC(&RcvTCB->tcb_lock, NULL);
RcvTCB->tcb_flags &= ~IN_RCV_IND;
ASSERT(RcvTCB->tcb_rcvhndlr == IndicateData);
// Push him on the front of the rcv. queue.
ASSERT((RcvTCB->tcb_currcv == NULL) ||
(RcvTCB->tcb_currcv->trr_amt == 0));
if (RcvTCB->tcb_rcvhead == NULL) {
RcvTCB->tcb_rcvhead = RcvReq;
RcvTCB->tcb_rcvtail = RcvReq;
RcvReq->trr_next = NULL;
} else {
RcvReq->trr_next = RcvTCB->tcb_rcvhead;
RcvTCB->tcb_rcvhead = RcvReq;
}
RcvTCB->tcb_currcv = RcvReq;
RcvTCB->tcb_rcvhndlr = BufferData;
ASSERT(BytesTaken <= Size);
RcvTCB->tcb_indicated -= BytesTaken;
if ((Size -= BytesTaken) != 0) {
RcvTCB->tcb_moreflag = 2;
// Not everything was taken. Adjust the buffer chain to point
// beyond what was taken.
InBuffer = FreePartialRB(InBuffer, BytesTaken);
ASSERT(InBuffer != NULL);
// We've adjusted the buffer chain. Call the BufferData
// handler.
BytesTaken += BufferData(RcvTCB, RcvFlags, InBuffer, Size);
} else {
// All of the data was taken. Free the buffer chain.
FreeRBChain(InBuffer);
}
return BytesTaken;
#if !MILLEN
} else {
//
// The IRP was cancelled before it was handed back to us.
// We'll pretend we never saw it. TCPPrepareIrpForCancel
// already completed it. The client may have taken data,
// so we will act as if success was returned.
//
ERB = NULL;
Status = TDI_SUCCESS;
#endif // !MILLEN
}
}
CTEGetLockAtDPC(&RcvTCB->tcb_lock, NULL);
RcvTCB->tcb_flags &= ~IN_RCV_IND;
// Status is not more processing. If it's not SUCCESS, the client
// didn't take any of the data. In either case we now need to
// see if all of the data was taken. If it wasn't, we'll try and
// push it onto the front of the pending queue.
FreeRcvReq(RcvReq); // This won't be needed.
if (Status == TDI_NOT_ACCEPTED)
BytesTaken = 0;
ASSERT(BytesTaken <= Size);
RcvTCB->tcb_indicated -= BytesTaken;
ASSERT(RcvTCB->tcb_rcvhndlr == IndicateData);
// Check to see if a rcv. buffer got posted during the indication.
// If it did, reset the recv. handler now.
if (RcvTCB->tcb_rcvhead != NULL)
RcvTCB->tcb_rcvhndlr = BufferData;
// See if all of the data was taken.
if (BytesTaken == Size) {
ASSERT(RcvTCB->tcb_indicated == 0);
FreeRBChain(InBuffer);
return BytesTaken; // It was all taken.
}
// It wasn't all taken. Adjust for what was taken, and push
// on the front of the pending queue. We also need to check to
// see if a receive buffer got posted during the indication. This
// would be weird, but not impossible.
InBuffer = FreePartialRB(InBuffer, BytesTaken);
if (RcvTCB->tcb_rcvhead == NULL) {
RcvTCB->tcb_rcvhndlr = PendData;
NewBuf = CopyRBChain(InBuffer, &LastBuf, Size - BytesTaken);
if (NewBuf != NULL) {
// We have a duplicate chain. Push it on the front of the
// pending q.
if (RcvTCB->tcb_pendhead == NULL) {
RcvTCB->tcb_pendhead = NewBuf;
RcvTCB->tcb_pendtail = LastBuf;
} else {
LastBuf->ipr_next = RcvTCB->tcb_pendhead;
RcvTCB->tcb_pendhead = NewBuf;
}
RcvTCB->tcb_pendingcnt += Size - BytesTaken;
BytesTaken = Size;
RcvTCB->tcb_moreflag = 3;
} else {
FreeRBChain(InBuffer);
}
return BytesTaken;
} else {
// Just great. There's now a rcv. buffer on the TCB. Call the
// BufferData handler now.
ASSERT(RcvTCB->tcb_rcvhndlr == BufferData);
BytesTaken += BufferData(RcvTCB, RcvFlags, InBuffer,
Size - BytesTaken);
return BytesTaken;
}
} else {
// Couldn't get a recv. request. We must be really low on resources,
// so just bail out now.
FreeRBChain(InBuffer);
return 0;
}
DEBUGMSG(DBG_TRACE && DBG_TDI, (DTEXT("-IndicateData\n")));
}
//* IndicatePendingData - Indicate pending data to a client.
//
// Called when we need to indicate pending data to an upper layer client,
// usually because data arrived when we were in a state that it couldn't
// be indicated.
//
// Many of the comments in the BufferData header about the consistency of
// tcb_pendingcnt apply here also.
//
// Input: RcvTCB - TCB on which to indicate the data.
// RcvReq - Rcv. req. to use to indicate it.
//
// Returns: Nothing.
//
void
IndicatePendingData(TCB *RcvTCB, TCPRcvReq *RcvReq, CTELockHandle TCBHandle)
{
TDI_STATUS Status;
PRcvEvent Event;
PVOID EventContext, ConnContext;
#if !MILLEN
EventRcvBuffer *ERB = NULL;
PTDI_REQUEST_KERNEL_RECEIVE RequestInformation;
PIO_STACK_LOCATION IrpSp;
#else // !MILLEN
EventRcvBuffer ERB;
#endif // MILLEN
IPRcvBuf *NewBuf;
uint Size;
uint BytesIndicated;
uint BytesAvailable;
uint BytesTaken = 0;
uchar *DataBuffer;
CTEStructAssert(RcvTCB, tcb);
ASSERT(RcvTCB->tcb_refcnt != 0);
ASSERT(RcvTCB->tcb_rcvind != NULL);
ASSERT(RcvTCB->tcb_rcvhead == NULL);
ASSERT(RcvTCB->tcb_pendingcnt != 0);
ASSERT(RcvReq != NULL);
for (;;) {
ASSERT(RcvTCB->tcb_rcvhndlr == PendData);
// The indicate handler is saved in the TCB. Just call up into it.
Event = RcvTCB->tcb_rcvind;
EventContext = RcvTCB->tcb_ricontext;
ConnContext = RcvTCB->tcb_conncontext;
BytesIndicated = RcvTCB->tcb_pendhead->ipr_size;
BytesAvailable = RcvTCB->tcb_pendingcnt;
DataBuffer = RcvTCB->tcb_pendhead->ipr_buffer;
RcvTCB->tcb_indicated = RcvTCB->tcb_pendingcnt;
RcvTCB->tcb_flags |= IN_RCV_IND;
RcvTCB->tcb_moreflag = 0;
CTEFreeLock(&RcvTCB->tcb_lock, TCBHandle);
IF_TCPDBG(TCPDebug & TCP_DEBUG_RECEIVE) {
TCPTRACE((
"Indicating pending %d bytes, %d available\n",
RcvTCB->tcb_pendhead->ipr_size, RcvTCB->tcb_pendingcnt
));
}
Status = (*Event) (EventContext, ConnContext,
TDI_RECEIVE_COPY_LOOKAHEAD | TDI_RECEIVE_NORMAL |
TDI_RECEIVE_ENTIRE_MESSAGE,
BytesIndicated, BytesAvailable, &BytesTaken,
DataBuffer, &ERB);
IF_TCPDBG(TCPDebug & TCP_DEBUG_RECEIVE) {
TCPTRACE(("%d bytes taken\n", BytesTaken));
}
// See what the client did. If the return status is MORE_PROCESSING,
// we've been given a buffer. In that case put it on the front of the
// buffer queue, and if all the data wasn't taken go ahead and copy
// it into the new buffer chain.
if (Status == TDI_MORE_PROCESSING) {
#if !MILLEN
IF_TCPDBG(TCP_DEBUG_RECEIVE) {
TCPTRACE(("more processing on receive\n"));
}
ASSERT(ERB != NULL);
IrpSp = IoGetCurrentIrpStackLocation(ERB);
Status = TCPPrepareIrpForCancel(
(PTCP_CONTEXT) IrpSp->FileObject->FsContext,
ERB,
TCPCancelRequest
);
if (NT_SUCCESS(Status)) {
PNDIS_BUFFER pNdisBuffer;
Status = ConvertMdlToNdisBuffer(ERB, ERB->MdlAddress, &pNdisBuffer);
ASSERT(Status == TDI_SUCCESS);
RequestInformation = (PTDI_REQUEST_KERNEL_RECEIVE)
& (IrpSp->Parameters);
RcvReq->trr_rtn = TCPDataRequestComplete;
RcvReq->trr_context = ERB;
RcvReq->trr_buffer = pNdisBuffer;
RcvReq->trr_size = RequestInformation->ReceiveLength;
RcvReq->trr_uflags = (ushort *)
& (RequestInformation->ReceiveFlags);
RcvReq->trr_flags = (uint) (RequestInformation->ReceiveFlags);
RcvReq->trr_offset = 0;
RcvReq->trr_amt = 0;
#else // !MILLEN
if (1) {
RcvReq->trr_rtn = ERB.erb_rtn;
RcvReq->trr_context = ERB.erb_context;
RcvReq->trr_buffer = ERB.erb_buffer;
RcvReq->trr_size = ERB.erb_size;
RcvReq->trr_uflags = ERB.erb_flags;
RcvReq->trr_flags = (uint) (*ERB.erb_flags);
RcvReq->trr_offset = 0;
RcvReq->trr_amt = 0;
#endif // MILLLEN
CTEGetLock(&RcvTCB->tcb_lock, &TCBHandle);
RcvTCB->tcb_flags &= ~IN_RCV_IND;
// Push him on the front of the rcv. queue.
ASSERT((RcvTCB->tcb_currcv == NULL) ||
(RcvTCB->tcb_currcv->trr_amt == 0));
if (RcvTCB->tcb_rcvhead == NULL) {
RcvTCB->tcb_rcvhead = RcvReq;
RcvTCB->tcb_rcvtail = RcvReq;
RcvReq->trr_next = NULL;
} else {
RcvReq->trr_next = RcvTCB->tcb_rcvhead;
RcvTCB->tcb_rcvhead = RcvReq;
}
RcvTCB->tcb_currcv = RcvReq;
RcvTCB->tcb_rcvhndlr = BufferData;
// Have to pick up the new size and pointers now, since things could
// have changed during the upcall.
Size = RcvTCB->tcb_pendingcnt;
NewBuf = RcvTCB->tcb_pendhead;
RcvTCB->tcb_pendingcnt = 0;
RcvTCB->tcb_pendhead = NULL;
ASSERT(BytesTaken <= Size);
RcvTCB->tcb_indicated -= BytesTaken;
if ((Size -= BytesTaken) != 0) {
RcvTCB->tcb_moreflag = 4;
// Not everything was taken. Adjust the buffer chain to point
// beyond what was taken.
NewBuf = FreePartialRB(NewBuf, BytesTaken);
ASSERT(NewBuf != NULL);
// We've adjusted the buffer chain. Call the BufferData
// handler.
(void)BufferData(RcvTCB, TCP_FLAG_PUSH, NewBuf, Size);
CTEFreeLock(&RcvTCB->tcb_lock, TCBHandle);
} else {
// All of the data was taken. Free the buffer chain. Since
// we were passed a buffer chain which we put on the head of
// the list, leave the rcvhandler pointing at BufferData.
ASSERT(RcvTCB->tcb_rcvhndlr == BufferData);
ASSERT(RcvTCB->tcb_indicated == 0);
ASSERT(RcvTCB->tcb_rcvhead != NULL);
CTEFreeLock(&RcvTCB->tcb_lock, TCBHandle);
FreeRBChain(NewBuf);
}
return;
#if !MILLEN
} else {
//
// The IRP was cancelled before it was handed back to us.
// We'll pretend we never saw it. TCPPrepareIrpForCancel
// already completed it. The client may have taken data,
// so we will act as if success was returned.
//
ERB = NULL;
Status = TDI_SUCCESS;
#endif // !MILLEN
}
}
CTEGetLock(&RcvTCB->tcb_lock, &TCBHandle);
RcvTCB->tcb_flags &= ~IN_RCV_IND;
// Status is not more processing. If it's not SUCCESS, the client
// didn't take any of the data. In either case we now need to
// see if all of the data was taken. If it wasn't, we're done.
if (Status == TDI_NOT_ACCEPTED)
BytesTaken = 0;
ASSERT(RcvTCB->tcb_rcvhndlr == PendData);
RcvTCB->tcb_indicated -= BytesTaken;
Size = RcvTCB->tcb_pendingcnt;
NewBuf = RcvTCB->tcb_pendhead;
ASSERT(BytesTaken <= Size);
// See if all of the data was taken.
if (BytesTaken == Size) {
// It was all taken. Zap the pending data information.
RcvTCB->tcb_pendingcnt = 0;
RcvTCB->tcb_pendhead = NULL;
ASSERT(RcvTCB->tcb_indicated == 0);
if (RcvTCB->tcb_rcvhead == NULL) {
if (RcvTCB->tcb_rcvind != NULL)
RcvTCB->tcb_rcvhndlr = IndicateData;
} else
RcvTCB->tcb_rcvhndlr = BufferData;
CTEFreeLock(&RcvTCB->tcb_lock, TCBHandle);
FreeRBChain(NewBuf);
break;
}
// It wasn't all taken. Adjust for what was taken, We also need to check
// to see if a receive buffer got posted during the indication. This
// would be weird, but not impossible.
NewBuf = FreePartialRB(NewBuf, BytesTaken);
ASSERT(RcvTCB->tcb_rcvhndlr == PendData);
RcvTCB->tcb_moreflag = 5;
if (RcvTCB->tcb_rcvhead == NULL) {
RcvTCB->tcb_pendhead = NewBuf;
RcvTCB->tcb_pendingcnt -= BytesTaken;
if (RcvTCB->tcb_indicated != 0 || RcvTCB->tcb_rcvind == NULL) {
CTEFreeLock(&RcvTCB->tcb_lock, TCBHandle);
break;
}
// From here, we'll loop around and indicate the new data that
// presumably came in during the previous indication.
} else {
// Just great. There's now a rcv. buffer on the TCB. Call the
// BufferData handler now.
RcvTCB->tcb_rcvhndlr = BufferData;
RcvTCB->tcb_pendingcnt = 0;
RcvTCB->tcb_pendhead = NULL;
BytesTaken += BufferData(RcvTCB, TCP_FLAG_PUSH, NewBuf,
Size - BytesTaken);
CTEFreeLock(&RcvTCB->tcb_lock, TCBHandle);
break;
}
} // for (;;)
FreeRcvReq(RcvReq); // This isn't needed anymore.
}
//* DeliverUrgent - Deliver urgent data to a client.
//
// Called to deliver urgent data to a client. We assume the input
// urgent data is in a buffer we can keep. The buffer can be NULL, in
// which case we'll just look on the urgent pending queue for data.
//
// Input: RcvTCB - TCB to deliver on.
// RcvBuf - RcvBuffer for urgent data.
// Size - Number of bytes of urgent data to deliver.
//
// Returns: Nothing.
//
void
DeliverUrgent(TCB * RcvTCB, IPRcvBuf * RcvBuf, uint Size,
CTELockHandle * TCBHandle)
{
CTELockHandle AOHandle, AOTblHandle, ConnHandle;
TCPRcvReq *RcvReq, *PrevReq;
uint BytesTaken = 0;
IPRcvBuf *LastBuf;
#if !MILLEN
EventRcvBuffer *ERB;
#else // !MILLEN
EventRcvBuffer ERB;
#endif // MILLEN
#if TRACE_EVENT
PTDI_DATA_REQUEST_NOTIFY_ROUTINE CPCallBack;
WMIData WMIInfo;
#endif
PRcvEvent ExpRcv;
PVOID ExpRcvContext;
PVOID ConnContext;
TDI_STATUS Status;
CTEStructAssert(RcvTCB, tcb);
ASSERT(RcvTCB->tcb_refcnt != 0);
CheckRBList(RcvTCB->tcb_urgpending, RcvTCB->tcb_urgcnt);
// See if we have new data, or are processing old data.
if (RcvBuf != NULL) {
// We have new data. If the pending queue is not NULL, or we're already
// in this routine, just put the buffer on the end of the queue.
if (RcvTCB->tcb_urgpending != NULL || (RcvTCB->tcb_flags & IN_DELIV_URG)) {
IPRcvBuf *PrevRcvBuf;
// Put him on the end of the queue.
PrevRcvBuf = STRUCT_OF(IPRcvBuf, &RcvTCB->tcb_urgpending, ipr_next);
while (PrevRcvBuf->ipr_next != NULL)
PrevRcvBuf = PrevRcvBuf->ipr_next;
PrevRcvBuf->ipr_next = RcvBuf;
RcvTCB->tcb_urgcnt += Size;
return;
}
} else {
// The input buffer is NULL. See if we have existing data, or are in
// this routine. If we have no existing data or are in this routine
// just return.
if (RcvTCB->tcb_urgpending == NULL ||
(RcvTCB->tcb_flags & IN_DELIV_URG)) {
return;
} else {
RcvBuf = RcvTCB->tcb_urgpending;
Size = RcvTCB->tcb_urgcnt;
RcvTCB->tcb_urgpending = NULL;
RcvTCB->tcb_urgcnt = 0;
}
}
ASSERT(RcvBuf != NULL);
ASSERT(!(RcvTCB->tcb_flags & IN_DELIV_URG));
// We know we have data to deliver, and we have a pointer and a size.
// Go into a loop, trying to deliver the data. On each iteration, we'll
// try to find a buffer for the data. If we find one, we'll copy and
// complete it right away. Otherwise we'll try and indicate it. If we
// can't indicate it, we'll put it on the pending queue and leave.
RcvTCB->tcb_flags |= IN_DELIV_URG;
RcvTCB->tcb_slowcount++;
RcvTCB->tcb_fastchk |= TCP_FLAG_SLOW;
CheckTCBRcv(RcvTCB);
do {
CheckRBList(RcvTCB->tcb_urgpending, RcvTCB->tcb_urgcnt);
BytesTaken = 0;
// First check the expedited queue.
if ((RcvReq = RcvTCB->tcb_exprcv) != NULL)
RcvTCB->tcb_exprcv = RcvReq->trr_next;
else {
// Nothing in the expedited rcv. queue. Walk down the ordinary
// receive queue, looking for a buffer that we can steal.
PrevReq = STRUCT_OF(TCPRcvReq, &RcvTCB->tcb_rcvhead, trr_next);
RcvReq = PrevReq->trr_next;
while (RcvReq != NULL) {
CTEStructAssert(RcvReq, trr);
if (RcvReq->trr_flags & TDI_RECEIVE_EXPEDITED) {
// This is a candidate.
if (RcvReq->trr_amt == 0) {
ASSERT(RcvTCB->tcb_rcvhndlr == BufferData);
// And he has nothing currently in him. Pull him
// out of the queue.
if (RcvTCB->tcb_rcvtail == RcvReq) {
if (RcvTCB->tcb_rcvhead == RcvReq)
RcvTCB->tcb_rcvtail = NULL;
else
RcvTCB->tcb_rcvtail = PrevReq;
}
PrevReq->trr_next = RcvReq->trr_next;
if (RcvTCB->tcb_currcv == RcvReq) {
RcvTCB->tcb_currcv = RcvReq->trr_next;
if (RcvTCB->tcb_currcv == NULL) {
// We've taken the last receive from the list.
// Reset the rcvhndlr.
if (RcvTCB->tcb_rcvind != NULL &&
RcvTCB->tcb_indicated == 0)
RcvTCB->tcb_rcvhndlr = IndicateData;
else
RcvTCB->tcb_rcvhndlr = PendData;
}
}
break;
}
}
PrevReq = RcvReq;
RcvReq = PrevReq->trr_next;
}
}
// We've done our best to get a buffer. If we got one, copy into it
// now, and complete the request.
if (RcvReq != NULL) {
// Got a buffer.
CTEFreeLock(&RcvTCB->tcb_lock, *TCBHandle);
BytesTaken = CopyRcvToNdis(RcvBuf, RcvReq->trr_buffer, Size, 0, 0);
#if TRACE_EVENT
CPCallBack = TCPCPHandlerRoutine;
if (CPCallBack != NULL) {
ulong GroupType;
WMIInfo.wmi_destaddr = RcvTCB->tcb_daddr;
WMIInfo.wmi_destport = RcvTCB->tcb_dport;
WMIInfo.wmi_srcaddr = RcvTCB->tcb_saddr;
WMIInfo.wmi_srcport = RcvTCB->tcb_sport;
WMIInfo.wmi_size = BytesTaken;
WMIInfo.wmi_context = RcvTCB->tcb_cpcontext;
GroupType = EVENT_TRACE_GROUP_TCPIP + EVENT_TRACE_TYPE_RECEIVE;
(*CPCallBack) (GroupType, (PVOID) &WMIInfo, sizeof(WMIInfo), NULL);
}
#endif
(*RcvReq->trr_rtn) (RcvReq->trr_context, TDI_SUCCESS, BytesTaken);
FreeRcvReq(RcvReq);
CTEGetLock(&RcvTCB->tcb_lock, TCBHandle);
RcvTCB->tcb_urgind -= MIN(RcvTCB->tcb_urgind, BytesTaken);
} else {
// No posted buffer. If we can indicate, do so.
if (RcvTCB->tcb_urgind == 0) {
TCPConn *Conn;
// See if he has an expedited rcv handler.
ConnContext = RcvTCB->tcb_conncontext;
CTEFreeLock(&RcvTCB->tcb_lock, *TCBHandle);
CTEGetLock(&AddrObjTableLock.Lock, &AOTblHandle);
CTEGetLockAtDPC(&((ConnTable[CONN_BLOCKID(RcvTCB->tcb_connid)])->cb_lock), &ConnHandle);
#if DBG
ConnTable[CONN_BLOCKID(RcvTCB->tcb_connid)]->line = (uint) __LINE__;
ConnTable[CONN_BLOCKID(RcvTCB->tcb_connid)]->module = (uchar *) __FILE__;
#endif
//CTEGetLock(&ConnTableLock, &ConnHandle);
CTEGetLock(&RcvTCB->tcb_lock, TCBHandle);
if ((Conn = RcvTCB->tcb_conn) != NULL) {
CTEStructAssert(Conn, tc);
ASSERT(Conn->tc_tcb == RcvTCB);
CTEFreeLock(&RcvTCB->tcb_lock, *TCBHandle);
if (Conn->tc_ao != NULL) {
AddrObj *AO;
AO = Conn->tc_ao;
CTEGetLock(&AO->ao_lock, &AOHandle);
if (AO_VALID(AO) && (ExpRcv = AO->ao_exprcv) != NULL) {
ExpRcvContext = AO->ao_exprcvcontext;
CTEFreeLock(&AO->ao_lock, AOHandle);
// We're going to indicate.
RcvTCB->tcb_urgind = Size;
ASSERT(Conn->tc_ConnBlock == ConnTable[CONN_BLOCKID(RcvTCB->tcb_connid)]);
CTEFreeLockFromDPC(&(Conn->tc_ConnBlock->cb_lock), ConnHandle);
CTEFreeLock(&AddrObjTableLock.Lock, AOTblHandle);
Status = (*ExpRcv) (ExpRcvContext, ConnContext,
TDI_RECEIVE_COPY_LOOKAHEAD |
TDI_RECEIVE_ENTIRE_MESSAGE |
TDI_RECEIVE_EXPEDITED,
RcvBuf->ipr_size, Size, &BytesTaken,
RcvBuf->ipr_buffer, &ERB);
CTEGetLock(&RcvTCB->tcb_lock, TCBHandle);
// See what he did with it.
if (Status == TDI_MORE_PROCESSING) {
uint CopySize;
// He gave us a buffer.
if (BytesTaken == Size) {
// He gave us a buffer, but took all of
// it. We'll just return it to him.
CopySize = 0;
} else {
// We have some data to copy in.
RcvBuf = FreePartialRB(RcvBuf, BytesTaken);
#if !MILLEN
CopySize = CopyRcvToMdl(RcvBuf,
ERB->MdlAddress,
TCPGetMdlChainByteCount(ERB->MdlAddress),
0, 0);
#else //!MILLEN
CopySize = CopyRcvToNdis(RcvBuf,
ERB.erb_buffer,
ERB.erb_size,
0, 0);
#endif // MILLEN
}
BytesTaken += CopySize;
RcvTCB->tcb_urgind -= MIN(RcvTCB->tcb_urgind,
BytesTaken);
CTEFreeLock(&RcvTCB->tcb_lock, *TCBHandle);
#if !MILLEN
ERB->IoStatus.Status = TDI_SUCCESS;
ERB->IoStatus.Information = CopySize;
IoCompleteRequest(ERB, 2);
#else // !MILLEN
(*ERB.erb_rtn) (ERB.erb_context, TDI_SUCCESS,
CopySize);
#endif // MILLEN
CTEGetLock(&RcvTCB->tcb_lock, TCBHandle);
} else {
// No buffer to deal with.
if (Status == TDI_NOT_ACCEPTED)
BytesTaken = 0;
RcvTCB->tcb_urgind -= MIN(RcvTCB->tcb_urgind,
BytesTaken);
}
goto checksize;
} else // No rcv. handler.
CTEFreeLock(&AO->ao_lock, AOHandle);
}
// Conn->tc_ao == NULL.
ASSERT(Conn->tc_ConnBlock == ConnTable[CONN_BLOCKID(RcvTCB->tcb_connid)]);
CTEFreeLockFromDPC(&(Conn->tc_ConnBlock->cb_lock), ConnHandle);
//CTEFreeLock(&ConnTableLock, ConnHandle);
CTEFreeLock(&AddrObjTableLock.Lock, AOTblHandle);
CTEGetLock(&RcvTCB->tcb_lock, TCBHandle);
} else {
// RcvTCB has invalid index.
//CTEFreeLock(&ConnTableLock, *TCBHandle);
CTEFreeLockFromDPC(&((ConnTable[CONN_BLOCKID(RcvTCB->tcb_connid)])->cb_lock), ConnHandle);
CTEFreeLock(&AddrObjTableLock.Lock, AOTblHandle);
*TCBHandle = AOTblHandle;
}
}
// For whatever reason we couldn't indicate the data. At this point
// we hold the lock on the TCB. Push the buffer onto the pending
// queue and return.
CheckRBList(RcvTCB->tcb_urgpending, RcvTCB->tcb_urgcnt);
LastBuf = FindLastBuffer(RcvBuf);
LastBuf->ipr_next = RcvTCB->tcb_urgpending;
RcvTCB->tcb_urgpending = RcvBuf;
RcvTCB->tcb_urgcnt += Size;
break;
}
checksize:
// See how much we took. If we took it all, check the pending queue.
// At this point, we should hold the lock on the TCB.
if (Size == BytesTaken) {
// Took it all.
FreeRBChain(RcvBuf);
RcvBuf = RcvTCB->tcb_urgpending;
Size = RcvTCB->tcb_urgcnt;
} else {
// We didn't manage to take it all. Free what we did take,
// and then merge with the pending queue.
RcvBuf = FreePartialRB(RcvBuf, BytesTaken);
Size = Size - BytesTaken + RcvTCB->tcb_urgcnt;
if (RcvTCB->tcb_urgpending != NULL) {
// Find the end of the current RcvBuf chain, so we can
// merge.
LastBuf = FindLastBuffer(RcvBuf);
LastBuf->ipr_next = RcvTCB->tcb_urgpending;
}
}
RcvTCB->tcb_urgpending = NULL;
RcvTCB->tcb_urgcnt = 0;
} while (RcvBuf != NULL);
CheckRBList(RcvTCB->tcb_urgpending, RcvTCB->tcb_urgcnt);
RcvTCB->tcb_flags &= ~IN_DELIV_URG;
if (--(RcvTCB->tcb_slowcount) == 0) {
RcvTCB->tcb_fastchk &= ~TCP_FLAG_SLOW;
CheckTCBRcv(RcvTCB);
}
}
//* PushData - Push all data back to the client.
//
// Called when we've received a FIN and need to push data to the client.
//
// Input: PushTCB - TCB to be pushed.
//
// Returns: Nothing.
//
void
PushData(TCB * PushTCB)
{
TCPRcvReq *RcvReq;
CTEStructAssert(PushTCB, tcb);
RcvReq = PushTCB->tcb_rcvhead;
while (RcvReq != NULL) {
CTEStructAssert(RcvReq, trr);
RcvReq->trr_flags |= TRR_PUSHED;
RcvReq = RcvReq->trr_next;
}
RcvReq = PushTCB->tcb_exprcv;
while (RcvReq != NULL) {
CTEStructAssert(RcvReq, trr);
RcvReq->trr_flags |= TRR_PUSHED;
RcvReq = RcvReq->trr_next;
}
if (PushTCB->tcb_rcvhead != NULL || PushTCB->tcb_exprcv != NULL)
DelayAction(PushTCB, NEED_RCV_CMPLT);
}
//* SplitRcvBuf - Split an IPRcvBuf into three pieces.
//
// This function takes an input IPRcvBuf and splits it into three pieces.
// The first piece is the input buffer, which we just skip over. The second
// and third pieces are actually copied, even if we already own them, so
// that the may go to different places.
//
// Input: RcvBuf - RcvBuf chain to be split.
// Size - Total size in bytes of rcvbuf chain.
// Offset - Offset to skip over.
// SecondSize - Size in bytes of second piece.
// SecondBuf - Where to return second buffer pointer.
// ThirdBuf - Where to return third buffer pointer.
//
// Returns: Nothing. *SecondBuf and *ThirdBuf are set to NULL if we can't
// get memory for them.
//
void
SplitRcvBuf(IPRcvBuf * RcvBuf, uint Size, uint Offset, uint SecondSize,
IPRcvBuf ** SecondBuf, IPRcvBuf ** ThirdBuf)
{
IPRcvBuf *TempBuf;
uint ThirdSize;
ASSERT(Offset < Size);
ASSERT(((Offset + SecondSize) < Size) || (((Offset + SecondSize) == Size)
&& ThirdBuf == NULL));
ASSERT(RcvBuf != NULL);
// RcvBuf points at the buffer to copy from, and Offset is the offset into
// this buffer to copy from.
if (SecondBuf != NULL) {
// We need to allocate memory for a second buffer.
TempBuf = AllocTcpIpr(SecondSize, 'BPCT');
if (TempBuf != NULL) {
CopyRcvToBuffer(TempBuf->ipr_buffer, RcvBuf, SecondSize, Offset);
*SecondBuf = TempBuf;
} else {
*SecondBuf = NULL;
if (ThirdBuf != NULL)
*ThirdBuf = NULL;
return;
}
}
if (ThirdBuf != NULL) {
// We need to allocate memory for a third buffer.
ThirdSize = Size - (Offset + SecondSize);
TempBuf = AllocTcpIpr(ThirdSize, 'BPCT');
if (TempBuf != NULL) {
CopyRcvToBuffer(TempBuf->ipr_buffer, RcvBuf, ThirdSize,
Offset + SecondSize);
*ThirdBuf = TempBuf;
} else
*ThirdBuf = NULL;
}
}
//* HandleUrgent - Handle urgent data.
//
// Called when an incoming segment has urgent data in it. We make sure there
// really is urgent data in the segment, and if there is we try to dispose
// of it either by putting it into a posted buffer or calling an exp. rcv.
// indication handler.
//
// This routine is called at DPC level, and with the TCP locked.
//
// Urgent data handling is a little complicated. Each TCB has the starting
// and ending sequence numbers of the 'current' (last received) bit of urgent
// data. It is possible that the start of the current urgent data might be
// greater than tcb_rcvnext, if urgent data came in, we handled it, and then
// couldn't take the preceding normal data. The urgent valid flag is cleared
// when the next byte of data the user would read (rcvnext - pendingcnt) is
// greater than the end of urgent data - we do this so that we can correctly
// support SIOCATMARK. We always seperate urgent data out of the data stream.
// If the urgent valid field is set when we get into this routing we have
// to play a couple of games. If the incoming segment starts in front of the
// current urgent data, we truncate it before the urgent data, and put any
// data after the urgent data on the reassemble queue. These gyrations are
// done to avoid delivering the same urgent data twice. If the urgent valid
// field in the TCB is set and the segment starts after the current urgent
// data the new urgent information will replace the current urgent information.
//
// Input: RcvTCB - TCB to recv the data on.
// RcvInfo - RcvInfo structure for the incoming segment.
// RcvBuf - Pointer to IPRcvBuf train containing the
// incoming segment.
// Size - Pointer to size in bytes of data in the segment.
//
// Returns: Nothing.
//
void
HandleUrgent(TCB * RcvTCB, TCPRcvInfo * RcvInfo, IPRcvBuf * RcvBuf, uint * Size)
{
uint BytesInFront, BytesInBack; // Bytes in front of and in
// back of the urgent data.
uint UrgSize; // Size in bytes of urgent data.
SeqNum UrgStart, UrgEnd;
IPRcvBuf *EndBuf, *UrgBuf;
TCPRcvInfo NewRcvInfo;
CTELockHandle TCBHandle;
CTEStructAssert(RcvTCB, tcb);
ASSERT(RcvTCB->tcb_refcnt != 0);
ASSERT(RcvInfo->tri_flags & TCP_FLAG_URG);
ASSERT(SEQ_EQ(RcvInfo->tri_seq, RcvTCB->tcb_rcvnext));
// First, validate the urgent pointer.
if (RcvTCB->tcb_flags & BSD_URGENT) {
// We're using BSD style urgent data. We assume that the urgent
// data is one byte long, and that the urgent pointer points one
// after the urgent data instead of at the last byte of urgent data.
// See if the urgent data is in this segment.
if (RcvInfo->tri_urgent == 0 || RcvInfo->tri_urgent > *Size) {
// Not in this segment. Clear the urgent flag and return.
RcvInfo->tri_flags &= ~TCP_FLAG_URG;
return;
}
UrgSize = 1;
BytesInFront = RcvInfo->tri_urgent - 1;
} else {
// This is not BSD style urgent. We assume that the urgent data
// starts at the front of the segment and the last byte is pointed
// to by the urgent data pointer.
BytesInFront = 0;
UrgSize = MIN(RcvInfo->tri_urgent + 1, *Size);
}
BytesInBack = *Size - BytesInFront - UrgSize;
// UrgStart and UrgEnd are the first and last sequence numbers of the
// urgent data in this segment.
UrgStart = RcvInfo->tri_seq + BytesInFront;
UrgEnd = UrgStart + UrgSize - 1;
if (!(RcvTCB->tcb_flags & URG_INLINE)) {
EndBuf = NULL;
// Now see if this overlaps with any urgent data we've already seen.
if (RcvTCB->tcb_flags & URG_VALID) {
// We have some urgent data still around. See if we've advanced
// rcvnext beyond the urgent data. If we have, this is new urgent
// data, and we can go ahead and process it (although anyone doing
// an SIOCATMARK socket command might get confused). If we haven't
// consumed the data in front of the existing urgent data yet, we'll
// truncate this seg. to that amount and push the rest onto the
// reassembly queue. Note that rcvnext should never fall between
// tcb_urgstart and tcb_urgend.
ASSERT(SEQ_LT(RcvTCB->tcb_rcvnext, RcvTCB->tcb_urgstart) ||
SEQ_GT(RcvTCB->tcb_rcvnext, RcvTCB->tcb_urgend));
if (SEQ_LT(RcvTCB->tcb_rcvnext, RcvTCB->tcb_urgstart)) {
// There appears to be some overlap in the data stream. Split
// the buffer up into pieces that come before the current urgent
// data and after the current urgent data, putting the latter
// on the reassembly queue.
UrgSize = RcvTCB->tcb_urgend - RcvTCB->tcb_urgstart + 1;
BytesInFront = MIN(RcvTCB->tcb_urgstart - RcvTCB->tcb_rcvnext,
(int)*Size);
if (SEQ_GT(RcvTCB->tcb_rcvnext + *Size, RcvTCB->tcb_urgend)) {
// We have data after this piece of urgent data.
BytesInBack = RcvTCB->tcb_rcvnext + *Size -
RcvTCB->tcb_urgend;
} else
BytesInBack = 0;
SplitRcvBuf(RcvBuf, *Size, BytesInFront, UrgSize, NULL,
(BytesInBack ? &EndBuf : NULL));
if (EndBuf != NULL) {
NewRcvInfo.tri_seq = RcvTCB->tcb_urgend + 1;
NewRcvInfo.tri_flags = RcvInfo->tri_flags;
NewRcvInfo.tri_urgent = UrgEnd - NewRcvInfo.tri_seq;
if (RcvTCB->tcb_flags & BSD_URGENT)
NewRcvInfo.tri_urgent++;
NewRcvInfo.tri_ack = RcvInfo->tri_ack;
NewRcvInfo.tri_window = RcvInfo->tri_window;
if (!PutOnRAQ(RcvTCB, &NewRcvInfo, EndBuf, BytesInBack)){
FreeRBChain(EndBuf);
}
}
*Size = BytesInFront;
//iishack fix. Do not allow lookahead
//buffer size to be more than that is allocated!!
if (RcvBuf->ipr_size >= BytesInFront) {
RcvBuf->ipr_size = BytesInFront;
}
RcvInfo->tri_flags &= ~TCP_FLAG_URG;
return;
}
}
// We have urgent data we can process now. Split it into its component
// parts, the first part, the urgent data, and the stuff after the
// urgent data.
SplitRcvBuf(RcvBuf, *Size, BytesInFront, UrgSize, &UrgBuf,
(BytesInBack ? &EndBuf : NULL));
// If we managed to split out the end stuff, put it on the queue now.
if (EndBuf != NULL) {
NewRcvInfo.tri_seq = RcvInfo->tri_seq + BytesInFront + UrgSize;
NewRcvInfo.tri_flags = RcvInfo->tri_flags & ~TCP_FLAG_URG;
NewRcvInfo.tri_ack = RcvInfo->tri_ack;
NewRcvInfo.tri_window = RcvInfo->tri_window;
PutOnRAQ(RcvTCB, &NewRcvInfo, EndBuf, BytesInBack);
}
if (UrgBuf != NULL) {
// We succesfully split the urgent data out.
if (!(RcvTCB->tcb_flags & URG_VALID)) {
RcvTCB->tcb_flags |= URG_VALID;
RcvTCB->tcb_slowcount++;
RcvTCB->tcb_fastchk |= TCP_FLAG_SLOW;
CheckTCBRcv(RcvTCB);
}
RcvTCB->tcb_urgstart = UrgStart;
RcvTCB->tcb_urgend = UrgEnd;
TCBHandle = DISPATCH_LEVEL;
DeliverUrgent(RcvTCB, UrgBuf, UrgSize, &TCBHandle);
}
*Size = BytesInFront;
if (RcvBuf->ipr_size >= BytesInFront) {
RcvBuf->ipr_size = BytesInFront;
}
} else {
// Urgent data is to be processed inline. We just need to remember
// where it is and treat it as normal data. If there's already urgent
// data, we remember the latest urgent data.
RcvInfo->tri_flags &= ~TCP_FLAG_URG;
if (RcvTCB->tcb_flags & URG_VALID) {
// There is urgent data. See if this stuff comes after the existing
// urgent data.
if (SEQ_LTE(UrgEnd, RcvTCB->tcb_urgend)) {
// The existing urgent data completely overlaps this stuff,
// so ignore this.
return;
}
} else {
RcvTCB->tcb_flags |= URG_VALID;
RcvTCB->tcb_slowcount++;
RcvTCB->tcb_fastchk |= TCP_FLAG_SLOW;
CheckTCBRcv(RcvTCB);
}
RcvTCB->tcb_urgstart = UrgStart;
RcvTCB->tcb_urgend = UrgEnd;
}
return;
}
//* TdiReceive - Process a receive request.
//
// This is the main TDI receive request handler. We validate the connection
// and make sure that we have a TCB in the proper state, then we try to
// allocate a receive request structure. If that succeeds, we'll look and
// see what's happening on the TCB - if there's pending data, we'll put it
// in the buffer. Otherwise we'll just queue the receive for later.
//
// Input: Request - TDI_REQUEST structure for this request.
// Flags - Pointer to flags word.
// RcvLength - Pointer to length in bytes of receive buffer.
// Buffer - Pointer to buffer to take data.
//
// Returns: TDI_STATUS of request.
//
TDI_STATUS
TdiReceive(PTDI_REQUEST Request, ushort * Flags, uint * RcvLength,
PNDIS_BUFFER Buffer)
{
TCPConn *Conn;
TCB *RcvTCB;
TCPRcvReq *RcvReq;
CTELockHandle ConnTableHandle, TCBHandle;
TDI_STATUS Error;
ushort UFlags;
Conn = GetConnFromConnID(PtrToUlong(Request->Handle.ConnectionContext), &ConnTableHandle);
if (Conn != NULL) {
CTEStructAssert(Conn, tc);
RcvTCB = Conn->tc_tcb;
if (RcvTCB != NULL) {
CTEStructAssert(RcvTCB, tcb);
CTEGetLock(&RcvTCB->tcb_lock, &TCBHandle);
CTEFreeLock(&(Conn->tc_ConnBlock->cb_lock), TCBHandle);
UFlags = *Flags;
if ((DATA_RCV_STATE(RcvTCB->tcb_state) ||
(RcvTCB->tcb_pendingcnt != 0 && (UFlags & TDI_RECEIVE_NORMAL)) ||
(RcvTCB->tcb_urgcnt != 0 && (UFlags & TDI_RECEIVE_EXPEDITED)) ||
(RcvTCB->tcb_indicated && (RcvTCB->tcb_state == TCB_CLOSE_WAIT)))
&& !CLOSING(RcvTCB)) {
// We have a TCB, and it's valid. Get a receive request now.
CheckRBList(RcvTCB->tcb_pendhead, RcvTCB->tcb_pendingcnt);
RcvReq = GetRcvReq();
if (RcvReq != NULL) {
RcvReq->trr_rtn = Request->RequestNotifyObject;
RcvReq->trr_context = Request->RequestContext;
RcvReq->trr_buffer = Buffer;
RcvReq->trr_size = *RcvLength;
RcvReq->trr_uflags = Flags;
RcvReq->trr_offset = 0;
RcvReq->trr_amt = 0;
RcvReq->trr_flags = (uint) UFlags;
if ((UFlags & (TDI_RECEIVE_NORMAL | TDI_RECEIVE_EXPEDITED))
!= TDI_RECEIVE_EXPEDITED) {
// This is not an expedited only receive. Put him
// on the normal receive queue.
RcvReq->trr_next = NULL;
if (RcvTCB->tcb_rcvhead == NULL) {
// The receive queue is empty. Put him on the front.
RcvTCB->tcb_rcvhead = RcvReq;
RcvTCB->tcb_rcvtail = RcvReq;
} else {
RcvTCB->tcb_rcvtail->trr_next = RcvReq;
RcvTCB->tcb_rcvtail = RcvReq;
}
//if this rcv is for zero length complete this
// and indicate pending data again, if any
if (RcvReq->trr_size == 0) {
REFERENCE_TCB(RcvTCB);
RcvReq->trr_flags |= TRR_PUSHED;
CTEFreeLock(&RcvTCB->tcb_lock,ConnTableHandle);
CompleteRcvs(RcvTCB);
CTEGetLock(&RcvTCB->tcb_lock,&ConnTableHandle);
DerefTCB(RcvTCB, ConnTableHandle);
return TDI_PENDING;
}
// If this recv. can't hold urgent data or there isn't
// any pending urgent data continue processing.
if (!(UFlags & TDI_RECEIVE_EXPEDITED) ||
RcvTCB->tcb_urgcnt == 0) {
// If tcb_currcv is NULL, there is no currently
// active receive. In this case, check to see if
// there is pending data and that we are not
// currently in a receive indication handler. If
// both of these are true then deal with the
// pending data.
if (RcvTCB->tcb_currcv == NULL) {
RcvTCB->tcb_currcv = RcvReq;
// No currently active receive.
if (!(RcvTCB->tcb_flags & IN_RCV_IND)) {
// Not in a rcv. indication.
RcvTCB->tcb_rcvhndlr = BufferData;
if (RcvTCB->tcb_pendhead == NULL) {
CTEFreeLock(&RcvTCB->tcb_lock,
ConnTableHandle);
return TDI_PENDING;
} else {
IPRcvBuf *PendBuffer;
uint PendSize;
uint OldRcvWin;
// We have pending data to deal with.
PendBuffer = RcvTCB->tcb_pendhead;
PendSize = RcvTCB->tcb_pendingcnt;
RcvTCB->tcb_pendhead = NULL;
RcvTCB->tcb_pendingcnt = 0;
REFERENCE_TCB(RcvTCB);
// We assume that BufferData holds
// the lock (does not yield) during
// this call. If this changes for some
// reason, we'll have to fix the code
// below that does the window update
// check. See the comments in the
// BufferData() routine for more info.
(void)BufferData(RcvTCB, TCP_FLAG_PUSH,
PendBuffer, PendSize);
CheckTCBRcv(RcvTCB);
// Now we need to see if the window
// has changed. If it has, send an
// ACK.
OldRcvWin = RcvTCB->tcb_rcvwin;
if (OldRcvWin != RcvWin(RcvTCB)) {
// The window has changed, so send
// an ACK.
DelayAction(RcvTCB, NEED_ACK);
}
DerefTCB(RcvTCB, ConnTableHandle);
ProcessTCBDelayQ();
return TDI_PENDING;
}
}
// In a receive indication. The recv. request
// is now on the queue, so just fall through
// to the return.
}
// A rcv. is currently active. No need to do
// anything else.
CTEFreeLock(&RcvTCB->tcb_lock, ConnTableHandle);
return TDI_PENDING;
} else {
// This buffer can hold urgent data and we have
// some pending. Deliver it now.
REFERENCE_TCB(RcvTCB);
DeliverUrgent(RcvTCB, NULL, 0, &ConnTableHandle);
DerefTCB(RcvTCB, ConnTableHandle);
return TDI_PENDING;
}
} else {
TCPRcvReq *Temp;
// This is an expedited only receive. Just put him
// on the end of the expedited receive queue.
Temp = STRUCT_OF(TCPRcvReq, &RcvTCB->tcb_exprcv,
trr_next);
while (Temp->trr_next != NULL)
Temp = Temp->trr_next;
RcvReq->trr_next = NULL;
Temp->trr_next = RcvReq;
if (RcvTCB->tcb_urgpending != NULL) {
REFERENCE_TCB(RcvTCB);
DeliverUrgent(RcvTCB, NULL, 0, &ConnTableHandle);
DerefTCB(RcvTCB, ConnTableHandle);
return TDI_PENDING;
} else
Error = TDI_PENDING;
}
} else {
// Couldn't get a rcv. req.
Error = TDI_NO_RESOURCES;
}
} else {
// The TCB is in an invalid state.
Error = TDI_INVALID_STATE;
}
CTEFreeLock(&RcvTCB->tcb_lock, ConnTableHandle);
return Error;
} else { // No TCB for connection.
CTEFreeLock(&((Conn->tc_ConnBlock)->cb_lock), ConnTableHandle);
Error = TDI_INVALID_STATE;
}
} else // No connection.
Error = TDI_INVALID_CONNECTION;
//CTEFreeLock(&ConnTableLock, ConnTableHandle);
return Error;
}
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