Sample Code
Windows Driver Samples/ Windows Filtering Platform Sample/ C++/ syslib/ HelperFunctions_NetBuffer.cpp/
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 | //////////////////////////////////////////////////////////////////////////////////////////////////////// Copyright (c) 2012 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//////////////////////////////////////////////////////////////////////////////////////////////////////#include "HelperFunctions_Include.h" /// .#include "HelperFunctions_NetBuffer.tmh" /// $(OBJ_PATH)\$(O)\/** @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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