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/*++
Copyright (c) 1989-1993 Microsoft Corporation
Module Name:
rcv.c
Abstract:
This module contains code which performs the following TDI services:
o TdiReceive
o TdiReceiveDatagram
Environment:
Kernel mode
Revision History:
--*/
#include "st.h"
NTSTATUS
StTdiReceive(
IN PIRP Irp
)
/*++
Routine Description:
This routine performs the TdiReceive request for the transport provider.
Arguments:
Irp - I/O Request Packet for this request.
Return Value:
NTSTATUS - status of operation.
--*/
{
NTSTATUS status;
PTP_CONNECTION connection;
KIRQL oldirql, cancelirql;
PTP_REQUEST tpRequest;
LARGE_INTEGER timeout = {0,0};
PIO_STACK_LOCATION irpSp;
PMDL ReceiveBuffer;
ULONG ReceiveBufferLength;
PTDI_REQUEST_KERNEL_RECEIVE parameters;
//
// verify that the operation is taking place on a connection. At the same
// time we do this, we reference the connection. This ensures it does not
// get removed out from under us. Note also that we do the connection
// lookup within a try/except clause, thus protecting ourselves against
// really bogus handles
//
irpSp = IoGetCurrentIrpStackLocation (Irp);
connection = irpSp->FileObject->FsContext;
status = StVerifyConnectionObject (connection);
if (!NT_SUCCESS (status)) {
return status;
}
//
// Initialize bytes transferred here.
//
Irp->IoStatus.Information = 0; // reset byte transfer count.
parameters = (PTDI_REQUEST_KERNEL_RECEIVE)(&irpSp->Parameters);
ReceiveBuffer = Irp->MdlAddress;
ReceiveBufferLength =parameters->ReceiveLength;
//
// Queue up this receive to the connection object.
//
status = StCreateRequest (
Irp, // IRP for this request.
connection, // context.
REQUEST_FLAGS_CONNECTION, // partial flags.
ReceiveBuffer,
ReceiveBufferLength,
timeout,
&tpRequest);
//
// We have a request, now queue it. If the connection has gone south on us
// while we were getting things going, we will avoid actually queing the
// request.
//
if (NT_SUCCESS (status)) {
// This reference is removed by StDestroyRequest.
StReferenceConnection("TdiReceive request", connection);
tpRequest->Owner = ConnectionType;
IoAcquireCancelSpinLock(&cancelirql);
ACQUIRE_SPIN_LOCK (&connection->SpinLock,&oldirql);
if ((connection->Flags & CONNECTION_FLAGS_STOPPING) != 0) {
RELEASE_SPIN_LOCK (&connection->SpinLock,oldirql);
IoReleaseCancelSpinLock(cancelirql);
StCompleteRequest (
tpRequest,
connection->Status,
0);
status = STATUS_PENDING;
} else {
//
// Insert onto the receive queue, and make the IRP
// cancellable.
//
InsertTailList (&connection->ReceiveQueue,&tpRequest->Linkage);
RELEASE_SPIN_LOCK (&connection->SpinLock,oldirql);
//
// If this IRP has been cancelled, then call the
// cancel routine.
//
if (Irp->Cancel) {
Irp->CancelIrql = cancelirql;
StCancelReceive((PDEVICE_OBJECT)(connection->Provider), Irp);
StDereferenceConnection ("IRP cancelled", connection); // release lookup hold.
return STATUS_PENDING;
}
Irp->CancelRoutine = StCancelReceive;
IoReleaseCancelSpinLock(cancelirql);
AwakenReceive (connection); // awaken if sleeping.
status = STATUS_PENDING;
}
}
StDereferenceConnection("temp TdiReceive", connection);
return status;
} /* TdiReceive */
NTSTATUS
StTdiReceiveDatagram(
IN PIRP Irp
)
/*++
Routine Description:
This routine performs the TdiReceiveDatagram request for the transport
provider. Receive datagrams just get queued up to an address, and are
completed when a DATAGRAM or DATAGRAM_BROADCAST frame is received at
the address.
Arguments:
Irp - I/O Request Packet for this request.
Return Value:
NTSTATUS - status of operation.
--*/
{
NTSTATUS status;
KIRQL oldirql;
PTP_ADDRESS address;
PTP_ADDRESS_FILE addressFile;
PTP_REQUEST tpRequest;
LARGE_INTEGER timeout = {0,0};
PIO_STACK_LOCATION irpSp;
PMDL ReceiveBuffer;
ULONG ReceiveBufferLength;
//
// verify that the operation is taking place on an address. At the same
// time we do this, we reference the address. This ensures it does not
// get removed out from under us. Note also that we do the address
// lookup within a try/except clause, thus protecting ourselves against
// really bogus handles
//
irpSp = IoGetCurrentIrpStackLocation (Irp);
addressFile = irpSp->FileObject->FsContext;
status = StVerifyAddressObject (addressFile);
if (!NT_SUCCESS (status)) {
return status;
}
address = addressFile->Address;
ReceiveBuffer = Irp->MdlAddress;
ReceiveBufferLength =
((PTDI_REQUEST_KERNEL_RECEIVEDG)(&irpSp->Parameters))->ReceiveLength;
status = StCreateRequest (
Irp, // IRP for this request.
address, // context
REQUEST_FLAGS_ADDRESS, // partial flags.
ReceiveBuffer,
ReceiveBufferLength,
timeout,
&tpRequest);
if (NT_SUCCESS (status)) {
StReferenceAddress ("Receive datagram", address);
tpRequest->Owner = AddressType;
ACQUIRE_SPIN_LOCK (&address->SpinLock,&oldirql);
if ((address->Flags & ADDRESS_FLAGS_STOPPING) != 0) {
RELEASE_SPIN_LOCK (&address->SpinLock,oldirql);
StCompleteRequest (tpRequest, STATUS_NETWORK_NAME_DELETED, 0);
status = STATUS_PENDING;
} else {
InsertTailList (&addressFile->ReceiveDatagramQueue,&tpRequest->Linkage);
RELEASE_SPIN_LOCK (&address->SpinLock,oldirql);
}
status = STATUS_PENDING;
}
StDereferenceAddress ("Temp rcv datagram", address);
return status;
} /* TdiReceiveDatagram */
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