IP Packet Redirector Driver Sample
NDIS 5 IM & NDIS 6 LWF
Windows XP - Windows 7

IP Packet Redirector Sample

Conceptually the IP Packet Redirector is simple. It provides a way to insert a user-mode application into the Windows network “stack” in a way that allows it to examine and modify each IP packet being sent or received by the Windows host. This sort of driver can ne described as a "NDIS tap". The concept is illustrated in Figure 1 below:

 

Figure 1 - IP Packet Redirector Conceptual Block Diagram

 

Implementation Overview

Of course the concept doesn’t actually fit the reality of the actual implementation. Win32 applications simply cannot exist in the kernel architecture.

Instead a NDIS filter driver called IPRedir is inserted into the kernel networking stack. The user-mode application and the kernel-mode driver transfer packet data using ordinary Win32 ReadFile and WriteFile methods. This is illustrated in Figure 2 below:

 

Figure 2 - IP Packet Redirector Simplified Block Diagram

The current IPRedir samples can be used on Windows platforms ranging from Windows XP through Windows 7. However, the XP and the post- XP Windows’s kernel-mode networking architecture and implementations are vastly different. In order to accommodate the differences there are two IPRedir NDIS drivers:

Both drivers will be referred to as “filter drivers”.

Even though the details of the two drivers are different there is a single user-mode API. This means that a common user-mode application can be used on all of the supported Windows platforms

Detailed Documentation

You can download the complete documentation provided with the product here.

Download Sample Executables

You can download the IP Redirector sample filter drivers and sample application executables for evaluation.

These sample executables are provided:

The download is a Windows Installer MSI package.

Remember that these are Windows console applications. After installation you will find the sample executables in the Program Files\PCAUSA\IPRedir folder.

The MSI package installs the NDIS filter driver appropriate for the host platform. The sample software and drivers can be uninstalled using the standard Windows Uninstall Programs facility.

Download IP Redirector Sample Executables for Windows XP through Windows 7 (x86).
1822.00KB (1865728 bytes)

The samples are licensed intellectual property of PCAUSA. However, PCAUSA sample driver products are provided with a royalty-free license that is intended to allow customers to derive their own products using all or parts of the samples. The royalty-free license applies strictly to the distribution of product in binary (executable) form; there are quite naturally restrictions on distribution of sample source code.

The complete license can be found here.

Pricing for this product and ordering information can be found on Ordering Information page.

[Detailed Release Notes]

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Last modified: February 04, 2010