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/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
dispatch.c
Abstract:
This module contains code for opening a handle to AFD.
Author:
David Treadwell (davidtr) 21-Feb-1992
Revision History:
--*/
#include "afdp.h"
#ifdef ALLOC_PRAGMA
#pragma alloc_text( PAGE, AfdCreate )
#endif
extern PSECURITY_DESCRIPTOR AfdRawSecurityDescriptor;
NTSTATUS
AfdCreate (
IN PIRP Irp,
IN PIO_STACK_LOCATION IrpSp
)
/*++
Routine Description:
This is the routine that handles Create IRPs in AFD. If creates an
AFD_ENDPOINT structure and fills it in with the information
specified in the open packet.
Arguments:
Irp - Pointer to I/O request packet.
IrpSp - pointer to the IO stack location to use for this request.
Return Value:
NTSTATUS -- Indicates whether the request was successfully queued.
--*/
{
PAFD_OPEN_PACKET openPacket;
PAFD_ENDPOINT endpoint;
PFILE_FULL_EA_INFORMATION eaBuffer;
UNICODE_STRING transportDeviceName;
NTSTATUS status;
PAGED_CODE( );
DEBUG endpoint = NULL;
//
// Find the open packet from the EA buffer in the system buffer of
// the associated IRP. Fail the request if there was no EA
// buffer specified.
//
eaBuffer = Irp->AssociatedIrp.SystemBuffer;
if ( eaBuffer == NULL ) {
//
// Allocate an AFD "helper" endpoint.
//
status = AfdAllocateEndpoint(
&endpoint,
NULL,
0
);
if( !NT_SUCCESS(status) ) {
return status;
}
} else {
openPacket = (PAFD_OPEN_PACKET)(eaBuffer->EaName +
eaBuffer->EaNameLength + 1);
//
// Validate parameters in the open packet.
//
if ( openPacket->EndpointType < MIN_AFD_ENDPOINT_TYPE ||
openPacket->EndpointType > MAX_AFD_ENDPOINT_TYPE ) {
return STATUS_INVALID_PARAMETER;
}
//
// Make sure that the transport address fits within the specified
// EA buffer.
//
if ( eaBuffer->EaValueLength <
sizeof(AFD_OPEN_PACKET) + openPacket->TransportDeviceNameLength ) {
return STATUS_ACCESS_VIOLATION;
}
//
// Set up a string that describes the transport device name.
//
transportDeviceName.Buffer = openPacket->TransportDeviceName;
transportDeviceName.Length = (USHORT)openPacket->TransportDeviceNameLength;
transportDeviceName.MaximumLength =
transportDeviceName.Length + sizeof(WCHAR);
//
// If this is an open of a raw endpoint, perform an access check.
//
if ( ( openPacket->EndpointType == AfdEndpointTypeRaw ) &&
!AfdDisableRawSecurity
)
{
BOOLEAN accessGranted;
PACCESS_STATE accessState;
PIO_SECURITY_CONTEXT securityContext;
NTSTATUS status;
PPRIVILEGE_SET privileges = NULL;
ACCESS_MASK grantedAccess;
securityContext = IrpSp->Parameters.Create.SecurityContext;
accessState = securityContext->AccessState;
SeLockSubjectContext(&accessState->SubjectSecurityContext);
accessGranted = SeAccessCheck(
AfdRawSecurityDescriptor,
&accessState->SubjectSecurityContext,
TRUE,
IrpSp->Parameters.Create.SecurityContext->DesiredAccess,
0,
&privileges,
IoGetFileObjectGenericMapping(),
UserMode,
&grantedAccess,
&status
);
if (privileges) {
(VOID) SeAppendPrivileges(
accessState,
privileges
);
SeFreePrivileges(privileges);
}
if (accessGranted) {
accessState->PreviouslyGrantedAccess |= grantedAccess;
accessState->RemainingDesiredAccess &= ~( grantedAccess | MAXIMUM_ALLOWED );
}
SeUnlockSubjectContext(&accessState->SubjectSecurityContext);
if (!accessGranted) {
return STATUS_ACCESS_DENIED;
}
}
//
// Allocate an AFD endpoint.
//
status = AfdAllocateEndpoint(
&endpoint,
&transportDeviceName,
openPacket->GroupID
);
if( !NT_SUCCESS(status) ) {
return status;
}
}
ASSERT( endpoint != NULL );
//
// Set up a pointer to the endpoint in the file object so that we
// can find the endpoint in future calls.
//
IrpSp->FileObject->FsContext = endpoint;
IF_DEBUG(OPEN_CLOSE) {
KdPrint(( "AfdCreate: opened file object = %lx, endpoint = %lx\n",
IrpSp->FileObject, endpoint ));
}
//
// Remember the type of endpoint that this is. If this is a datagram
// endpoint, change the block type to reflect this.
//
if ( eaBuffer != NULL ) {
if (openPacket->EndpointType == AfdEndpointTypeRaw) {
//
// There is no other distinction between a raw endpoint and
// a datagram endpoint, so we mark them all as datagram.
//
endpoint->EndpointType = AfdEndpointTypeDatagram;
}
else {
endpoint->EndpointType = openPacket->EndpointType;
}
}
if ( IS_DGRAM_ENDPOINT(endpoint) ) {
if ( eaBuffer == NULL ) {
DEREFERENCE_ENDPOINT( endpoint );
AfdCloseEndpoint( endpoint );
return STATUS_INVALID_PARAMETER;
}
endpoint->Type = AfdBlockTypeDatagram;
//
// Initialize lists which exist only in datagram endpoints.
//
InitializeListHead( &endpoint->ReceiveDatagramIrpListHead );
InitializeListHead( &endpoint->PeekDatagramIrpListHead );
InitializeListHead( &endpoint->ReceiveDatagramBufferListHead );
//
// Charge quota for the endpoint to account for the data
// bufferring we'll do on behalf of the process.
//
try {
PsChargePoolQuota(
endpoint->OwningProcess,
NonPagedPool,
AfdReceiveWindowSize + AfdSendWindowSize
);
AfdRecordQuotaHistory(
endpoint->OwningProcess,
(LONG)(AfdReceiveWindowSize + AfdSendWindowSize),
"Create dgram",
endpoint
);
AfdRecordPoolQuotaCharged(
AfdReceiveWindowSize + AfdSendWindowSize
);
} except ( EXCEPTION_EXECUTE_HANDLER ) {
#if DBG
DbgPrint( "AfdCreate: PsChargePoolQuota failed.\n" );
#endif
DEREFERENCE_ENDPOINT( endpoint );
AfdCloseEndpoint( endpoint );
return STATUS_QUOTA_EXCEEDED;
}
endpoint->Common.Datagram.MaxBufferredReceiveBytes = AfdReceiveWindowSize;
endpoint->Common.Datagram.MaxBufferredReceiveCount =
(CSHORT)(AfdReceiveWindowSize / AfdBufferMultiplier);
endpoint->Common.Datagram.MaxBufferredSendBytes = AfdSendWindowSize;
endpoint->Common.Datagram.MaxBufferredSendCount =
(CSHORT)(AfdSendWindowSize / AfdBufferMultiplier);
}
//
// The open worked. Dereference the endpoint and return success.
//
DEREFERENCE_ENDPOINT( endpoint );
return STATUS_SUCCESS;
} // AfdCreate
|
