Filter Hook [Device Drivers]

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From: Doron Holan [MS] on 6 Aug 2006 13:33

you can't reduce IRQL inline, you can only raise it and then lower it. if
you truly want to synchronously process soemthing, then queue it to a work
item. if you want your filter to not negatively affect performance, learn
how to process the results in the completion routine asynchronously

d

--
Please do not send e-mail directly to this alias. this alias is for
newsgroup purposes only.
This posting is provided "AS IS" with no warranties, and confers no rights.

<x856256(a)yahoo.com> wrote in message
news:1154873993.596484.241370(a)i42g2000cwa.googlegroups.com...
> No,
>
> The code is not taking any spinlocks.
> Anyone has an idea how can I reduce the IRQL level inside the filter
> hook function?
>
> Thanks,
> Guy
>
> Don Burn wrote:
>> You cannot call a lot of functions at DISPATCH_LEVEL. I am not well
>> versed
>> in filter hooks, so you need to determine if the raising to DISPATCH is
>> avoidable. For instance, if the code takes a spinlock, could it take an
>> ERESOURCE instead.
>>
>>
>> --
>> Don Burn (MVP, Windows DDK)
>> Windows 2k/XP/2k3 Filesystem and Driver Consulting
>> http://www.windrvr.com
>> Remove StopSpam from the email to reply
>>
>>
>>
>> <x856256(a)yahoo.com> wrote in message
>> news:1154861486.219608.122660(a)m73g2000cwd.googlegroups.com...
>> > Hello and thanks Don for the answer.
>> >
>> > It is running in IRQL_DISPATCH, I will try to reduce it and see what
>> > happens.
>> >
>> > Thanks,
>> > Guy
>> >
>> > Don Burn wrote:
>> >> A filter hook driver should not have an interrupt handler it is only
>> >> concerned with packets as they are presented to it. You should not
>> >> try
>> >> to
>> >> use IoConnectInterrupt with a software interrupt.
>> >>
>> >> What IRQL are you running at when you crash, a common problem here
>> >> would
>> >> be
>> >> calling the functions you mentioned at IRQL_DISPATCH or higher.
>> >>
>> >>
>> >> --
>> >> Don Burn (MVP, Windows DDK)
>> >> Windows 2k/XP/2k3 Filesystem and Driver Consulting
>> >> http://www.windrvr.com
>> >> Remove StopSpam from the email to reply
>> >>
>> >>
>> >>
>> >> <x856256(a)yahoo.com> wrote in message
>> >> news:1154814887.364085.142850(a)n13g2000cwa.googlegroups.com...
>> >> > Hi,
>> >> >
>> >> > Drivers are very new to me, can someone help me with the next issue
>> >> > please:
>> >> >
>> >> > I have tried to set up a Filter Hook driver.
>> >> > I took an example code from codeproject (DrvFltIp) and it works ok
>> >> > on
>> >> > my computer (Windows XP).
>> >> >
>> >> > When I try to process the packets more thoroughly than in this
>> >> > example
>> >> > code, my computer crashed (freezes or restarts immediately).
>> >> > The crash happens when I do something that involves a
>> >> > KeWaitForSingleObject or a KeDelayExecutionThread call (but I am not
>> >> > sure these are the only scenarios that cause a crash).
>> >> >
>> >> > I looked in the dump file with WinDbg after the crash and saw that
>> >> > one
>> >> > of the last actions of the kernel were sending an interrupt and
>> >> > afterwards an exception. So my guess was that the kernel is sending
>> >> > a
>> >> > trap that was sent to it by the hardware to my driver to handle, but
>> >> > since I didn't set up an interrupt call back function, an exception
>> >> > is
>> >> > raised.
>> >> > The next thing I did was to try and set up an interrupt call back
>> >> > function, but this also caused a similar crash to the system (when I
>> >> > tried to pull out the parameters that I have to pass to the function
>> >> > "IoConnectInterrupt" from the isrStack). I tried to call the
>> >> > function
>> >> > "IoConnectInterrupt" from the function
>> >> > "DriverObject->MajorFunction[IRP_MJ_CREATE]" when got
>> >> > "IRP_MJ_CREATE"
>> >> > in "irpStack->MajorFunction" or when I got "IRP_MN_START_DEVICE IRP"
>> >> > in
>> >> > "irpStack->MinorFunction". When I tried even to access the parameter
>> >> > "irpStack->Parameters->StartDevice.AllocatedResourcesTranslated->Count"
>> >> > (even without calling "IoConnectInterrupt") it caused a crash.
>> >> >
>> >> > If anyone can help me understand what I am doing wrong, and why I am
>> >> > getting all these crashes I would be grateful.
>> >> >
>> >> > Thanks,
>> >> > Guy
>> >> >
>> >
>

From: x856256 on 6 Aug 2006 16:19

Hello,

Either queueing the job or doing it asynchronously I will have to do
the job in another thread, and wait for the process of the packet to
finish (in order to return the drop, forward or pass reply), and this
is exactly where my problem began, when I tried to use the
KeWaitForSingleObject function.
So let me ask this again: How can I use this wait function, or any
other substitution that will allow me process the packet on another
thread (queued or not) and wait for it to finish processing in order to
return the value?

Thanks,
Guy

Doron Holan [MS] wrote:
> you can't reduce IRQL inline, you can only raise it and then lower it. if
> you truly want to synchronously process soemthing, then queue it to a work
> item. if you want your filter to not negatively affect performance, learn
> how to process the results in the completion routine asynchronously
>
> d
>
> --
> Please do not send e-mail directly to this alias. this alias is for
> newsgroup purposes only.
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>
> <x856256(a)yahoo.com> wrote in message
> news:1154873993.596484.241370(a)i42g2000cwa.googlegroups.com...
> > No,
> >
> > The code is not taking any spinlocks.
> > Anyone has an idea how can I reduce the IRQL level inside the filter
> > hook function?
> >
> > Thanks,
> > Guy
> >
> > Don Burn wrote:
> >> You cannot call a lot of functions at DISPATCH_LEVEL. I am not well
> >> versed
> >> in filter hooks, so you need to determine if the raising to DISPATCH is
> >> avoidable. For instance, if the code takes a spinlock, could it take an
> >> ERESOURCE instead.
> >>
> >>
> >> --
> >> Don Burn (MVP, Windows DDK)
> >> Windows 2k/XP/2k3 Filesystem and Driver Consulting
> >> http://www.windrvr.com
> >> Remove StopSpam from the email to reply
> >>
> >>
> >>
> >> <x856256(a)yahoo.com> wrote in message
> >> news:1154861486.219608.122660(a)m73g2000cwd.googlegroups.com...
> >> > Hello and thanks Don for the answer.
> >> >
> >> > It is running in IRQL_DISPATCH, I will try to reduce it and see what
> >> > happens.
> >> >
> >> > Thanks,
> >> > Guy
> >> >
> >> > Don Burn wrote:
> >> >> A filter hook driver should not have an interrupt handler it is only
> >> >> concerned with packets as they are presented to it. You should not
> >> >> try
> >> >> to
> >> >> use IoConnectInterrupt with a software interrupt.
> >> >>
> >> >> What IRQL are you running at when you crash, a common problem here
> >> >> would
> >> >> be
> >> >> calling the functions you mentioned at IRQL_DISPATCH or higher.
> >> >>
> >> >>
> >> >> --
> >> >> Don Burn (MVP, Windows DDK)
> >> >> Windows 2k/XP/2k3 Filesystem and Driver Consulting
> >> >> http://www.windrvr.com
> >> >> Remove StopSpam from the email to reply
> >> >>
> >> >>
> >> >>
> >> >> <x856256(a)yahoo.com> wrote in message
> >> >> news:1154814887.364085.142850(a)n13g2000cwa.googlegroups.com...
> >> >> > Hi,
> >> >> >
> >> >> > Drivers are very new to me, can someone help me with the next issue
> >> >> > please:
> >> >> >
> >> >> > I have tried to set up a Filter Hook driver.
> >> >> > I took an example code from codeproject (DrvFltIp) and it works ok
> >> >> > on
> >> >> > my computer (Windows XP).
> >> >> >
> >> >> > When I try to process the packets more thoroughly than in this
> >> >> > example
> >> >> > code, my computer crashed (freezes or restarts immediately).
> >> >> > The crash happens when I do something that involves a
> >> >> > KeWaitForSingleObject or a KeDelayExecutionThread call (but I am not
> >> >> > sure these are the only scenarios that cause a crash).
> >> >> >
> >> >> > I looked in the dump file with WinDbg after the crash and saw that
> >> >> > one
> >> >> > of the last actions of the kernel were sending an interrupt and
> >> >> > afterwards an exception. So my guess was that the kernel is sending
> >> >> > a
> >> >> > trap that was sent to it by the hardware to my driver to handle, but
> >> >> > since I didn't set up an interrupt call back function, an exception
> >> >> > is
> >> >> > raised.
> >> >> > The next thing I did was to try and set up an interrupt call back
> >> >> > function, but this also caused a similar crash to the system (when I
> >> >> > tried to pull out the parameters that I have to pass to the function
> >> >> > "IoConnectInterrupt" from the isrStack). I tried to call the
> >> >> > function
> >> >> > "IoConnectInterrupt" from the function
> >> >> > "DriverObject->MajorFunction[IRP_MJ_CREATE]" when got
> >> >> > "IRP_MJ_CREATE"
> >> >> > in "irpStack->MajorFunction" or when I got "IRP_MN_START_DEVICE IRP"
> >> >> > in
> >> >> > "irpStack->MinorFunction". When I tried even to access the parameter
> >> >> > "irpStack->Parameters->StartDevice.AllocatedResourcesTranslated->Count"
> >> >> > (even without calling "IoConnectInterrupt") it caused a crash.
> >> >> >
> >> >> > If anyone can help me understand what I am doing wrong, and why I am
> >> >> > getting all these crashes I would be grateful.
> >> >> >
> >> >> > Thanks,
> >> >> > Guy
> >> >> >
> >> >
> >

From: Alexander Grigoriev on 6 Aug 2006 16:47

The answer is again: you cannot wait on DISPATCH_LEVEL.

<x856256(a)yahoo.com> wrote in message
news:1154895564.296586.251240(a)n13g2000cwa.googlegroups.com...
> Hello,
>
> Either queueing the job or doing it asynchronously I will have to do
> the job in another thread, and wait for the process of the packet to
> finish (in order to return the drop, forward or pass reply), and this
> is exactly where my problem began, when I tried to use the
> KeWaitForSingleObject function.
> So let me ask this again: How can I use this wait function, or any
> other substitution that will allow me process the packet on another
> thread (queued or not) and wait for it to finish processing in order to
> return the value?
>
> Thanks,
> Guy
>
> Doron Holan [MS] wrote:
>> you can't reduce IRQL inline, you can only raise it and then lower it.
>> if
>> you truly want to synchronously process soemthing, then queue it to a
>> work
>> item. if you want your filter to not negatively affect performance,
>> learn
>> how to process the results in the completion routine asynchronously
>>
>> d
>>
>> --
>> Please do not send e-mail directly to this alias. this alias is for
>> newsgroup purposes only.
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>>
>> <x856256(a)yahoo.com> wrote in message
>> news:1154873993.596484.241370(a)i42g2000cwa.googlegroups.com...
>> > No,
>> >
>> > The code is not taking any spinlocks.
>> > Anyone has an idea how can I reduce the IRQL level inside the filter
>> > hook function?
>> >
>> > Thanks,
>> > Guy
>> >
>> > Don Burn wrote:
>> >> You cannot call a lot of functions at DISPATCH_LEVEL. I am not well
>> >> versed
>> >> in filter hooks, so you need to determine if the raising to DISPATCH
>> >> is
>> >> avoidable. For instance, if the code takes a spinlock, could it take
>> >> an
>> >> ERESOURCE instead.
>> >>
>> >>
>> >> --
>> >> Don Burn (MVP, Windows DDK)
>> >> Windows 2k/XP/2k3 Filesystem and Driver Consulting
>> >> http://www.windrvr.com
>> >> Remove StopSpam from the email to reply
>> >>
>> >>
>> >>
>> >> <x856256(a)yahoo.com> wrote in message
>> >> news:1154861486.219608.122660(a)m73g2000cwd.googlegroups.com...
>> >> > Hello and thanks Don for the answer.
>> >> >
>> >> > It is running in IRQL_DISPATCH, I will try to reduce it and see what
>> >> > happens.
>> >> >
>> >> > Thanks,
>> >> > Guy
>> >> >
>> >> > Don Burn wrote:
>> >> >> A filter hook driver should not have an interrupt handler it is
>> >> >> only
>> >> >> concerned with packets as they are presented to it. You should not
>> >> >> try
>> >> >> to
>> >> >> use IoConnectInterrupt with a software interrupt.
>> >> >>
>> >> >> What IRQL are you running at when you crash, a common problem here
>> >> >> would
>> >> >> be
>> >> >> calling the functions you mentioned at IRQL_DISPATCH or higher.
>> >> >>
>> >> >>
>> >> >> --
>> >> >> Don Burn (MVP, Windows DDK)
>> >> >> Windows 2k/XP/2k3 Filesystem and Driver Consulting
>> >> >> http://www.windrvr.com
>> >> >> Remove StopSpam from the email to reply
>> >> >>
>> >> >>
>> >> >>
>> >> >> <x856256(a)yahoo.com> wrote in message
>> >> >> news:1154814887.364085.142850(a)n13g2000cwa.googlegroups.com...
>> >> >> > Hi,
>> >> >> >
>> >> >> > Drivers are very new to me, can someone help me with the next
>> >> >> > issue
>> >> >> > please:
>> >> >> >
>> >> >> > I have tried to set up a Filter Hook driver.
>> >> >> > I took an example code from codeproject (DrvFltIp) and it works
>> >> >> > ok
>> >> >> > on
>> >> >> > my computer (Windows XP).
>> >> >> >
>> >> >> > When I try to process the packets more thoroughly than in this
>> >> >> > example
>> >> >> > code, my computer crashed (freezes or restarts immediately).
>> >> >> > The crash happens when I do something that involves a
>> >> >> > KeWaitForSingleObject or a KeDelayExecutionThread call (but I am
>> >> >> > not
>> >> >> > sure these are the only scenarios that cause a crash).
>> >> >> >
>> >> >> > I looked in the dump file with WinDbg after the crash and saw
>> >> >> > that
>> >> >> > one
>> >> >> > of the last actions of the kernel were sending an interrupt and
>> >> >> > afterwards an exception. So my guess was that the kernel is
>> >> >> > sending
>> >> >> > a
>> >> >> > trap that was sent to it by the hardware to my driver to handle,
>> >> >> > but
>> >> >> > since I didn't set up an interrupt call back function, an
>> >> >> > exception
>> >> >> > is
>> >> >> > raised.
>> >> >> > The next thing I did was to try and set up an interrupt call back
>> >> >> > function, but this also caused a similar crash to the system
>> >> >> > (when I
>> >> >> > tried to pull out the parameters that I have to pass to the
>> >> >> > function
>> >> >> > "IoConnectInterrupt" from the isrStack). I tried to call the
>> >> >> > function
>> >> >> > "IoConnectInterrupt" from the function
>> >> >> > "DriverObject->MajorFunction[IRP_MJ_CREATE]" when got
>> >> >> > "IRP_MJ_CREATE"
>> >> >> > in "irpStack->MajorFunction" or when I got "IRP_MN_START_DEVICE
>> >> >> > IRP"
>> >> >> > in
>> >> >> > "irpStack->MinorFunction". When I tried even to access the
>> >> >> > parameter
>> >> >> > "irpStack->Parameters->StartDevice.AllocatedResourcesTranslated->Count"
>> >> >> > (even without calling "IoConnectInterrupt") it caused a crash.
>> >> >> >
>> >> >> > If anyone can help me understand what I am doing wrong, and why I
>> >> >> > am
>> >> >> > getting all these crashes I would be grateful.
>> >> >> >
>> >> >> > Thanks,
>> >> >> > Guy
>> >> >> >
>> >> >
>> >
>

From: Alexander Grigoriev on 6 Aug 2006 16:47

From: hanzhu on 6 Aug 2006 22:38

IIRC, IP filter driver should process these packets through the callback
routine instead of submitting the IRP to the lower tcpip protocol
driver. Why do you need to pass the IRPs and wait for its completion?

x856256(a)yahoo.com ?:
> Hello,
>
> Either queueing the job or doing it asynchronously I will have to do
> the job in another thread, and wait for the process of the packet to
> finish (in order to return the drop, forward or pass reply), and this
> is exactly where my problem began, when I tried to use the
> KeWaitForSingleObject function.
> So let me ask this again: How can I use this wait function, or any
> other substitution that will allow me process the packet on another
> thread (queued or not) and wait for it to finish processing in order to
> return the value?
>
> Thanks,
> Guy
>
> Doron Holan [MS] wrote:
>> you can't reduce IRQL inline, you can only raise it and then lower it. if
>> you truly want to synchronously process soemthing, then queue it to a work
>> item. if you want your filter to not negatively affect performance, learn
>> how to process the results in the completion routine asynchronously
>>
>> d
>>
>> --
>> Please do not send e-mail directly to this alias. this alias is for
>> newsgroup purposes only.
>> This posting is provided "AS IS" with no warranties, and confers no rights.
>>
>>
>> <x856256(a)yahoo.com> wrote in message
>> news:1154873993.596484.241370(a)i42g2000cwa.googlegroups.com...
>>> No,
>>>
>>> The code is not taking any spinlocks.
>>> Anyone has an idea how can I reduce the IRQL level inside the filter
>>> hook function?
>>>
>>> Thanks,
>>> Guy
>>>
>>> Don Burn wrote:
>>>> You cannot call a lot of functions at DISPATCH_LEVEL. I am not well
>>>> versed
>>>> in filter hooks, so you need to determine if the raising to DISPATCH is
>>>> avoidable. For instance, if the code takes a spinlock, could it take an
>>>> ERESOURCE instead.
>>>>
>>>>
>>>> --
>>>> Don Burn (MVP, Windows DDK)
>>>> Windows 2k/XP/2k3 Filesystem and Driver Consulting
>>>> http://www.windrvr.com
>>>> Remove StopSpam from the email to reply
>>>>
>>>>
>>>>
>>>> <x856256(a)yahoo.com> wrote in message
>>>> news:1154861486.219608.122660(a)m73g2000cwd.googlegroups.com...
>>>>> Hello and thanks Don for the answer.
>>>>>
>>>>> It is running in IRQL_DISPATCH, I will try to reduce it and see what
>>>>> happens.
>>>>>
>>>>> Thanks,
>>>>> Guy
>>>>>
>>>>> Don Burn wrote:
>>>>>> A filter hook driver should not have an interrupt handler it is only
>>>>>> concerned with packets as they are presented to it. You should not
>>>>>> try
>>>>>> to
>>>>>> use IoConnectInterrupt with a software interrupt.
>>>>>>
>>>>>> What IRQL are you running at when you crash, a common problem here
>>>>>> would
>>>>>> be
>>>>>> calling the functions you mentioned at IRQL_DISPATCH or higher.
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Don Burn (MVP, Windows DDK)
>>>>>> Windows 2k/XP/2k3 Filesystem and Driver Consulting
>>>>>> http://www.windrvr.com
>>>>>> Remove StopSpam from the email to reply
>>>>>>
>>>>>>
>>>>>>
>>>>>> <x856256(a)yahoo.com> wrote in message
>>>>>> news:1154814887.364085.142850(a)n13g2000cwa.googlegroups.com...
>>>>>>> Hi,
>>>>>>>
>>>>>>> Drivers are very new to me, can someone help me with the next issue
>>>>>>> please:
>>>>>>>
>>>>>>> I have tried to set up a Filter Hook driver.
>>>>>>> I took an example code from codeproject (DrvFltIp) and it works ok
>>>>>>> on
>>>>>>> my computer (Windows XP).
>>>>>>>
>>>>>>> When I try to process the packets more thoroughly than in this
>>>>>>> example
>>>>>>> code, my computer crashed (freezes or restarts immediately).
>>>>>>> The crash happens when I do something that involves a
>>>>>>> KeWaitForSingleObject or a KeDelayExecutionThread call (but I am not
>>>>>>> sure these are the only scenarios that cause a crash).
>>>>>>>
>>>>>>> I looked in the dump file with WinDbg after the crash and saw that
>>>>>>> one
>>>>>>> of the last actions of the kernel were sending an interrupt and
>>>>>>> afterwards an exception. So my guess was that the kernel is sending
>>>>>>> a
>>>>>>> trap that was sent to it by the hardware to my driver to handle, but
>>>>>>> since I didn't set up an interrupt call back function, an exception
>>>>>>> is
>>>>>>> raised.
>>>>>>> The next thing I did was to try and set up an interrupt call back
>>>>>>> function, but this also caused a similar crash to the system (when I
>>>>>>> tried to pull out the parameters that I have to pass to the function
>>>>>>> "IoConnectInterrupt" from the isrStack). I tried to call the
>>>>>>> function
>>>>>>> "IoConnectInterrupt" from the function
>>>>>>> "DriverObject->MajorFunction[IRP_MJ_CREATE]" when got
>>>>>>> "IRP_MJ_CREATE"
>>>>>>> in "irpStack->MajorFunction" or when I got "IRP_MN_START_DEVICE IRP"
>>>>>>> in
>>>>>>> "irpStack->MinorFunction". When I tried even to access the parameter
>>>>>>> "irpStack->Parameters->StartDevice.AllocatedResourcesTranslated->Count"
>>>>>>> (even without calling "IoConnectInterrupt") it caused a crash.
>>>>>>>
>>>>>>> If anyone can help me understand what I am doing wrong, and why I am
>>>>>>> getting all these crashes I would be grateful.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Guy
>>>>>>>
>

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