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/*++
Copyright (c) Microsoft Corporation. All rights reserved.
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
PURPOSE.
Module Name:
ExCallbk.c
Abstract: The routines in this module helps to solve driver load order
dependency between this sample and NDISWDM sample. These
routines are not required in a typical protocol driver. By default
this module is not included in the sample. You include these routines
by adding EX_CALLBACK defines to the 'sources' file. Read the
NDISWDM samples readme file for more information on how ExCallback
kernel interfaces are used to solve driver load order issue.
Environment:
Kernel mode
Revision History:
--*/
#include "precomp.h"
#ifdef EX_CALLBACK
#define __FILENUMBER 'LCxE'
#define NDISPROT_CALLBACK_NAME L"\\Callback\\NdisProtCallbackObject"
#define CALLBACK_SOURCE_NDISPROT 0
#define CALLBACK_SOURCE_NDISWDM 1
PCALLBACK_OBJECT CallbackObject = NULL;
PVOID CallbackRegisterationHandle = NULL;
typedef VOID (* NOTIFY_PRESENCE_CALLBACK)(OUT PVOID Source);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, ndisprotRegisterExCallBack)
#pragma alloc_text(PAGE, ndisprotUnregisterExCallBack)
#endif // ALLOC_PRAGMA
BOOLEAN
ndisprotRegisterExCallBack()
{
OBJECT_ATTRIBUTES ObjectAttr;
UNICODE_STRING CallBackObjectName;
NTSTATUS Status;
BOOLEAN bResult = TRUE;
DEBUGP(DL_LOUD, ("--> ndisprotRegisterExCallBack\n"));
PAGED_CODE();
do {
RtlInitUnicodeString(&CallBackObjectName, NDISPROT_CALLBACK_NAME);
InitializeObjectAttributes(&ObjectAttr,
&CallBackObjectName,
OBJ_CASE_INSENSITIVE | OBJ_PERMANENT,
NULL,
NULL);
Status = ExCreateCallback(&CallbackObject,
&ObjectAttr,
TRUE,
TRUE);
if (!NT_SUCCESS(Status))
{
DEBUGP(DL_ERROR, ("RegisterExCallBack: failed to create callback %lx\n", Status));
bResult = FALSE;
break;
}
CallbackRegisterationHandle = ExRegisterCallback(CallbackObject,
ndisprotCallback,
(PVOID)NULL);
if (CallbackRegisterationHandle == NULL)
{
DEBUGP(DL_ERROR,("RegisterExCallBack: failed to register a Callback routine%lx\n", Status));
bResult = FALSE;
break;
}
ExNotifyCallback(CallbackObject,
(PVOID)CALLBACK_SOURCE_NDISPROT,
(PVOID)NULL);
}while(FALSE);
if(!bResult) {
if (CallbackRegisterationHandle)
{
ExUnregisterCallback(CallbackRegisterationHandle);
CallbackRegisterationHandle = NULL;
}
if (CallbackObject)
{
ObDereferenceObject(CallbackObject);
CallbackObject = NULL;
}
}
DEBUGP(DL_LOUD, ("<-- ndisprotRegisterExCallBack\n"));
return bResult;
}
VOID
ndisprotUnregisterExCallBack()
{
DEBUGP(DL_LOUD, ("--> ndisprotUnregisterExCallBack\n"));
PAGED_CODE();
if (CallbackRegisterationHandle)
{
ExUnregisterCallback(CallbackRegisterationHandle);
CallbackRegisterationHandle = NULL;
}
if (CallbackObject)
{
ObDereferenceObject(CallbackObject);
CallbackObject = NULL;
}
DEBUGP(DL_LOUD, ("<-- ndisprotUnregisterExCallBack\n"));
}
VOID
ndisprotCallback(
PVOID CallBackContext,
PVOID Source,
PVOID CallbackAddr
)
{
NOTIFY_PRESENCE_CALLBACK func;
DEBUGP(DL_LOUD, ("==>ndisprotoCallback: Source %lx, CallbackAddr %p\n",
Source, CallbackAddr));
//
// if we are the one issuing this notification, just return
//
if (Source == CALLBACK_SOURCE_NDISPROT) {
return;
}
//
// Notification is coming from NDISWDM
// let it know that you are here
//
ASSERT(Source == (PVOID)CALLBACK_SOURCE_NDISWDM);
if(Source == (PVOID)CALLBACK_SOURCE_NDISWDM) {
ASSERT(CallbackAddr);
if (CallbackAddr == NULL)
{
DEBUGP(DL_ERROR, ("Callback called with invalid address %p\n", CallbackAddr));
return;
}
func = CallbackAddr;
func(CALLBACK_SOURCE_NDISPROT);
}
DEBUGP(DL_LOUD, ("<==ndisprotoCallback: Source, %lx\n", Source));
}
#endif
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