EXTENDING PASSTHRU NDIS IM DRIVER

It is certainly intended that you should be able to incorporate the ideas and code presented in this article into your own code. Once we can query information on a handle then we can fetch and display human-readable information about the adapter. Here is an example that is targeted to the "National Semiconductor Corp. Just when you thought we had exhausted the topic of opening and closing Win32 handles to the PassThru driver we find that there is another major issue to consider. The mechanism that we will add to make our Wininitiated call to NdisRequest will add a second level of indirection for completing requests. Implementation of the user-mode code for opening and closing a PassThru adapter handle is straightforward.

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It is also worthwhile to note that PtDerefAdapter can do more then simply free the memory being referenced.

Tutorial for NDIS intermediate drivers?

The decision to forward or to drop is made by FilterPacket in FilterRtns. However, the additional task of explaining each step really slowed me down - and that was actually a good thing.

When a user-mode handle is closed there will be some work to do in the DevCleanup and DevClose routines. So it is conceivable that two instances of an application, running at the same time, could each try to update all adapters dxtending yet instate different lists for different adapters. You will see the techniques in miniport. But to maintain cache coherency so that a given counter is fetched or updated as a unitstatistics counters are read or updated atomically.

In addition, there is the PassThru.

Each line in the file must contain a single dotted IP address, and the addresses must be in ascending order. At this point it is worthwhile to crank up the NDIS Tester to insure that we haven't screwed up to badly. Portions Passrhru c Microsoft Corporation; used by permission. After the adapter handle has been opened it is entirely possible that NDIS can unbind the adapter associated with the handle.

There are two important things to notice about this function:. It is certainly intended that you should be able to passthtu the ideas and code presented in this article into your own code. Making an appropriate modification to PtRequestComplete is the key change that must be made to the baseline code to add our Wininitiated NDIS query information implementation.

in They relate to generating debug messages that display the memory address of two structures. This article and the companion code are intended to be used for the benefit of the reader of this article. To extendign the driver's binding enumeration code, follow the links below. There is one additional problem concerning adapter handles that must be dealt with. However, this structure cannot be used when the bit driver is called by a bit application.

Networking driver samples - Windows drivers | Microsoft Docs

At this point we really want to move on and add the logic to open a handle to a specific PassThru extsnding. You can find some of his work at http: However, the PassThru sample stops short of actually illustrating any observable function.

This article and the accompanying sample code are provided for educational purposes only. The simplicity of the implementation introduces one restriction that should be noted:.

There is no serialization of updating or reading IP-address lists across adapters.

The driver's DevIoControl dispatcher will call a function that will fill the paassthru output buffer with an array of binding name strings. We will also develop a companion Win32 application to illustrate use of the extended functions.

Click here to view driver query-handling code fragments. You can reach him at antognini mindspring. You may also leave feedback directly on GitHub. But note that the sources files for the two latter refer to SDK files, so you may have to change something in those sources files; if you do, be sure you use no path names with imbedded blanks but rather the corresponding 8. The Win32 application needs to be notified of these events in order to handle them gracefully.

One starts PerfMon, right-clicks on the data window, chooses Add Counters, chooses PassThru Statistics from the Performance object drop-down list and selects the particular measure s of interest. Product feedback Sign in passyhru give documentation feedback. The first thing that I did was to repartition the hard drive to 1.

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