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////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2014 Microsoft Corporation. All Rights Reserved.
//
// Module Name:
// HelperFunctions_NetBuffer.cpp
//
// Abstract:
// This module contains kernel helper functions that assist with NET_BUFFER and NET_BUFFER_LIST.
//
// Naming Convention:
//
// <Module><Object><Action><Modifier>
//
// i.e.
//
// KrnlHlprNBLGetRequiredRefCount
//
// <Module>
// KrnlHlpr - Function is located in syslib\ and applies to kernel mode.
// <Object>
// NBL - Function pertains to NET_BUFFER_LIST objects.
// <Action>
// {
// Get - Function retrieves data.
// }
// <Modifier>
// {
// RequiredRefCount - Function returns a refCount for the NBL / NBL chain.
// }
//
// Private Functions:
//
// Public Functions:
// KrnlHlprNBLGetRequiredRefCount(),
//
// Author:
// Dusty Harper (DHarper)
//
// Revision History:
//
// [ Month ][Day] [Year] - [Revision]-[ Comments ]
// May 01, 2010 - 1.0 - Creation
// December 13, 2013 - 1.1 - Add KrnlHlprNBLCreateFromBuffer,
// KrnlHlprNBLCopyToBuffer,
// KrnlHlprNBLDestroyNew,
// KrnlHlprNBLCreateNew
//
////////////////////////////////////////////////////////////////////////////////////////////////////
#include "HelperFunctions_Include.h" /// .
#include "HelperFunctions_NetBuffer.tmh" /// $(OBJ_PATH)\$(O)\
/**
@kernel_helper_function="KrnlHlprNBLCreateFromBuffer"
Purpose: Creates a new NBL from the data contained in the supplied buffer. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
_Success_(return != 0)
NET_BUFFER_LIST* KrnlHlprNBLCreateFromBuffer(_In_ NDIS_HANDLE nblPoolHandle,
_In_reads_(bufferSize) BYTE* pBuffer,
_In_ UINT32 bufferSize,
_Outptr_opt_result_maybenull_ PMDL* ppMDL)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprNBLCreateFromBuffer()\n");
#endif /// DBG
NTSTATUS status = STATUS_SUCCESS;
NET_BUFFER_LIST* pNBL = 0;
PMDL pMDL = 0;
pMDL = IoAllocateMdl(pBuffer,
bufferSize,
FALSE,
FALSE,
0);
if(!pMDL)
{
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_ERROR_LEVEL,
" !!!! KrnlHlprNBLCreateFromBuffer : IoAllocateMdl() [pMDL: %#p]\n",
pMDL);
HLPR_BAIL;
}
MmBuildMdlForNonPagedPool(pMDL);
status = FwpsAllocateNetBufferAndNetBufferList(nblPoolHandle,
0,
0,
pMDL,
0,
bufferSize,
&pNBL);
if(status != STATUS_SUCCESS)
{
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_ERROR_LEVEL,
" !!!! KrnlHlprNBLCreateFromBuffer : FwpsAllocateNetBufferAndNetBufferList() [status: %#x]\n",
status);
HLPR_BAIL;
}
HLPR_BAIL_LABEL:
if(status != STATUS_SUCCESS)
{
IoFreeMdl(pMDL);
pMDL = 0;
}
if(ppMDL)
*ppMDL = pMDL;
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprNBLCreateFromBuffer() [pNBL: %#p]\n",
pNBL);
#endif /// DBG
return pNBL;
}
/**
@kernel_helper_function="KrnlHlprNBLCopyToBuffer"
Purpose: Copies the NBL to a buffer. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
_Success_(return != 0)
BYTE* KrnlHlprNBLCopyToBuffer(_In_opt_ NET_BUFFER_LIST* pTemplateNBL,
_Out_ UINT32* pSize,
_In_ UINT32 additionalSpace) /* 0 */
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprNBLCopyToBuffer()\n");
#endif /// DBG
NTSTATUS status = STATUS_SUCCESS;
BYTE* pBuffer = 0;
UINT32 numBytes = additionalSpace;
*pSize = 0;
if(pTemplateNBL)
{
for(NET_BUFFER* pNB = NET_BUFFER_LIST_FIRST_NB(pTemplateNBL);
pNB;
pNB = NET_BUFFER_NEXT_NB(pNB))
{
numBytes += NET_BUFFER_DATA_LENGTH(pNB);
}
}
if(numBytes)
{
HLPR_NEW_ARRAY(pBuffer,
BYTE,
numBytes,
WFPSAMPLER_SYSLIB_TAG);
HLPR_BAIL_ON_ALLOC_FAILURE(pBuffer,
status);
if(pTemplateNBL)
{
NET_BUFFER* pNB = NET_BUFFER_LIST_FIRST_NB(pTemplateNBL);
for(UINT32 bytesCopied = 0;
bytesCopied < numBytes &&
pNB;
pNB = NET_BUFFER_NEXT_NB(pNB))
{
BYTE* pContiguousBuffer = 0;
BYTE* pAllocatedBuffer = 0;
UINT32 bytesNeeded = NET_BUFFER_DATA_LENGTH(pNB);
if(bytesNeeded)
{
HLPR_NEW_ARRAY(pAllocatedBuffer,
BYTE,
bytesNeeded,
WFPSAMPLER_SYSLIB_TAG);
HLPR_BAIL_ON_ALLOC_FAILURE(pAllocatedBuffer,
status);
pContiguousBuffer = (BYTE*)NdisGetDataBuffer(pNB,
bytesNeeded,
pAllocatedBuffer,
1,
0);
RtlCopyMemory(&(pBuffer[bytesCopied]),
pContiguousBuffer ? pContiguousBuffer : pAllocatedBuffer,
bytesNeeded);
bytesCopied += bytesNeeded;
HLPR_DELETE_ARRAY(pAllocatedBuffer,
WFPSAMPLER_SYSLIB_TAG);
}
}
}
HLPR_BAIL_LABEL:
if(status != STATUS_SUCCESS)
{
HLPR_DELETE_ARRAY(pBuffer,
WFPSAMPLER_SYSLIB_TAG);
}
else
*pSize = numBytes;
}
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprNBLCopyToBuffer() [pBuffer: %#p]\n",
pBuffer);
#endif /// DBG
return pBuffer;
}
/**
@kernel_helper_function="KrnlHlprNBLDestroyNew"
Purpose: Destroys a new NBL. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
_Success_(*ppNetBufferList == 0 && *ppMDL == 0 && *ppAllocatedBuffer == 0)
VOID KrnlHlprNBLDestroyNew(_Inout_opt_ NET_BUFFER_LIST** ppNetBufferList,
_Inout_opt_ PMDL* ppMDL,
_Inout_opt_ BYTE** ppAllocatedBuffer)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprNBLDestroyNew()\n");
#endif /// DBG
if(ppNetBufferList)
{
FwpsFreeNetBufferList(*ppNetBufferList);
*ppNetBufferList = 0;
}
if(ppMDL)
{
IoFreeMdl(*ppMDL);
*ppMDL = 0;
}
if(ppAllocatedBuffer)
{
HLPR_DELETE_ARRAY(*ppAllocatedBuffer,
WFPSAMPLER_SYSLIB_TAG);
}
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprNBLDestroyNew()\n");
#endif /// DBG
return;
}
/**
@kernel_helper_function="KrnlHlprNBLCreateNew"
Purpose: Creates a new NBL. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
_Success_(return != 0)
NET_BUFFER_LIST* KrnlHlprNBLCreateNew(_In_ NDIS_HANDLE nblPoolHandle,
_In_opt_ NET_BUFFER_LIST* pTemplateNBL,
_Outptr_opt_result_buffer_maybenull_(*pSize) BYTE** ppAllocatedBuffer,
_Out_ UINT32* pSize,
_Outptr_opt_result_maybenull_ PMDL* ppMDL,
_In_ UINT32 additionalSpace, /* 0 */
_In_ BOOLEAN isOutbound) /* FALSE */
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprNBLCreateNew()\n");
#endif /// DBG
NET_BUFFER_LIST* pNBL = 0;
UINT32 size = 0;
BYTE* pBuffer = KrnlHlprNBLCopyToBuffer(pTemplateNBL,
&size,
additionalSpace);
if(pBuffer &&
size)
{
pNBL = KrnlHlprNBLCreateFromBuffer(nblPoolHandle,
pBuffer,
size,
ppMDL);
if(pNBL &&
pTemplateNBL)
{
if(isOutbound)
NdisCopySendNetBufferListInfo(pNBL,
pTemplateNBL);
else
NdisCopyReceiveNetBufferListInfo(pNBL,
pTemplateNBL);
}
else
{
HLPR_DELETE_ARRAY(pBuffer,
WFPSAMPLER_SYSLIB_TAG);
size = 0;
}
}
if(ppAllocatedBuffer)
*ppAllocatedBuffer = pBuffer;
*pSize = size;
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprNBLCreateNew() [pNBL: %#p]\n",
pNBL);
#endif /// DBG
return pNBL;
}
/**
@kernel_helper_function="KrnlHlprNBLGetRequiredRefCount"
Purpose: Return a count of how many NBLs are within the NBL chain. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
UINT32 KrnlHlprNBLGetRequiredRefCount(_In_ const NET_BUFFER_LIST* pNBL,
_In_ BOOLEAN isChained) /* FALSE */
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprNBLGetRequiredRefCount()\n");
#endif /// DBG
NT_ASSERT(pNBL);
UINT32 requiredRefCount = 0;
if(isChained)
{
for(NET_BUFFER_LIST* pCurrentNBL = (NET_BUFFER_LIST*)pNBL;
pCurrentNBL;
pCurrentNBL = NET_BUFFER_LIST_NEXT_NBL(pCurrentNBL))
{
requiredRefCount++;
}
}
else
requiredRefCount = 1;
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprNBLGetRequiredRefCount() [refCount: %#d]\n",
requiredRefCount);
#endif /// DBG
return requiredRefCount;
}
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