NetFilter SDK is a framework
for transparent filtering the data packets transmitted via network.
This is a high performance proxy-less solution, compatible with all
antiviruses/firewalls/other network filters. It perfectly 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. TDI level kernel
driver works on the top of TCP/IP stack and filters TCP and UDP protocols.
It has a simple user level API, which can be used from C/C++/.NET/Delphi
code.
Key features:
- 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 filtering is fully transparent, because the driver allows
viewing and changing TCP/UDP data without redirecting the traffic
to proxy and modifying the addresses. There are no conflicts with
antiviruses, firewalls and other filters.
- The filtering driver operates on transport level, in front
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.
There is no need to deal with the packet headers (like in NDIS
level packet filters) or complicated WinSock interfaces.
- There are no problems with the high-speed connections, because
the driver operates on transport level, between the applications
and TCP/IP stack. It is possible to control the speed of data
transmission.
- The driver works similarly on all 32-bit and 64-bit Windows
operating systems starting from Windows NT. It is possible to
use 32-bit API for working with 64-bit driver.
System requirements:
Windows NT/2000/XP/2003/Vista/2008/7, x86/x64.
Limitations:
The driver must be signed with a digital certificate to
work properly on 64-bit operating systems starting from WIndows
Vista.
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