NetFilter SDK WFP
===========================

NetFilter SDK is a framework for transparent filtering the data packets transmitted via network. This is a high performance proxy-less solution, compatible with antiviruses/firewalls/other network filters. 
It suits for developing the content filters, basic application level firewalls, traffic analyzers/shapers, other software that requires viewing and modifying TCP/UDP traffic on Windows.

SDK consists of kernel mode and user mode parts. The kernel driver works on the top of TCP/IP stack and filters TCP/UDP protocols. Additionally it is possible to filter any IP based protocols on packet layers.
It has a simple user mode API, which can be used from C/C++/.NET/Delphi code.

Key features
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- The solution allows filtering incoming/outgoing TCP connections and UDP datagrams in user mode application. It is possible to filter the specified subset of connections/datagrams, restricted by filtering rules. The outgoing TCP connections can be redirected to different address.
- By default the filtering is transparent for other filters, because the driver allows viewing and changing TCP/UDP data without redirecting the traffic to proxy and modifying the addresses. It reduces to minimum the probability of conflicts with antiviruses, firewalls and other filters.
- The filtering driver operates on transport level, on the top of TCP/IP stack. In effect it automatically supports all kinds of TCP/IP capable network adapters: Ethernet, Dial-up/DSL/Cable modems, wireless adapters including Wi-Fi and Bluetooth, virtual adapters like loopback or VPN.
- Both IPv6 and IPv4 are supported.
- The process context (as process identifier) is available for all network activity.
- The driver user level interface (API) is easy in use, but powerful.
- It is possible to control the speed of data transmission and count the traffic.
- The driver works in the same way on 32-bit and 64-bit Windows operating systems. It is possible to use 32-bit API for working with 64-bit driver.


.. toctree::
	installation
	building_drivers
	using_api
	configurations
	flow_control
	registry
	bind_redirection
	bug
	signing
	faq	
	reference