MDL

Arsen

Hi all.
Tell me please.
When I compose the MDL for NB, what should be the MdlFlags parameter of the MDL structure.
When I watch outgoing packets, the value of MdlFlag changes
4100 - 0001 0000 0000 0100
16412 - 0100 0000 0001 1100
12 - 0000 0000 0000 1100
when i allocate mdl to connect to NB using NdisAllocateMdl, MdlFlag is 12 (MDL_ALLOCATED_FIXID_SIZE | MDL_SOURCE_IS_NONPAGED_POOL)

Do I need to change this value and how?
Where can i find a read about it?
If I will not change the MdlFlags of the newly allocated MDLs, could this be causing network connections to not work properly?

Arsen

How to attach mdl to NB? Is this code is right?

VOID FilterSendNetBufferLists(NDIS_HANDLE FilterModuleContext, PNET_BUFFER_LIST NetBufferLists, NDIS_PORT_NUMBER PortNumber, ULONG SendFlags)
{
NET_BUFFER_LIST_NEXT_NBL(pNBL) = NULL;
PNET_BUFFER_LIST cloneNBL = NdisAllocateCloneNetBufferList(pNBL, NULL, NULL, NDIS_CLONE_FLAGS_USE_ORIGINAL_MDLS);//osr how_to_send_cloned_nbl
NET_BUFFER_LIST_NEXT_NBL(pNBL) = pTemp;
cloneNBL->SourceHandle = pFilter->FilterHandle;
for (int i = 0; i < MaxNetBufferListInfo; i++) NET_BUFFER_LIST_INFO(cloneNBL, i) = NET_BUFFER_LIST_INFO(pNBL, i); // I dont know why

}

NTSTATUS NdisEncryptDeviceIoControl(PDEVICE_OBJECT DeviceObject, PIRP Irp)
{
for (all NBs in NBL) {
PUCHAR pBuffer = NdisAllocateMemoryWithTagPriority(pFilter->FilterHandle, IrpSp->Parameters.DeviceIoControl.InputBufferLength - 1, FILTER_ALLOC_TAG, NormalPoolPriority);
RtlCopyMemory(pBuffer, (PUCHAR)Irp->AssociatedIrp.SystemBuffer + 1, IrpSp->Parameters.DeviceIoControl.InputBufferLength - 1);
PMDL pMdl = NdisAllocateMdl(pFilter->FilterHandle, pBuffer, IrpSp->Parameters.DeviceIoControl.InputBufferLength - 1);
pNB->MdlChain = pMdl;
pNB->DataLength = IrpSp->Parameters.DeviceIoControl.InputBufferLength - 1;
pNB->DataOffset = 0;
pNB->CurrentMdl = pMdl;
pNB->CurrentMdlOffset = pMdl->ByteOffset;
}

pNBL->Status = NDIS_STATUS_SUCCESS;
NdisFSendNetBufferLists(pFilter->FilterHandle, pNBL, NDIS_DEFAULT_PORT_NUMBER, 1);

}