basil00
32c5aa90f4
The idea is to make future versions of the WinDivert DLL compatible with older SYS and vice versa. The interface has also been streamlined so less system calls are required when the handle is first opened.
WinDivert 2.0: Windows Packet Divert
====================================
1. Introduction
---------------
Windows Packet Divert (WinDivert) is a user-mode packet interception library
for Windows 7, Windows 8 and Windows 10.
WinDivert enables user-mode capturing/modifying/dropping of network packets
sent to/from the Windows network stack. In summary, WinDivert can:
- capture network packets
- filter/drop network packets
- sniff network packets
- (re)inject network packets
- modify network packets
WinDivert can be used to implement user-mode packet filters, sniffers,
firewalls, NATs, VPNs, IDSs, tunneling applications, etc..
WinDivert supports the following features:
- packet interception, sniffing, or dropping modes
- support for loopback (localhost) traffic
- full IPv6 support
- network layer
- simple yet powerful API
- high-level filtering language
- filter priorities
- freely available under the terms of the GNU Lesser General Public
License (LGPLv3)
For more information see doc/windivert.html
2. Architecture
---------------
The basic architecture of WinDivert is as follows:
+-----------------+
| |
+------->| PROGRAM |--------+
| | (WinDivert.dll) | |
| +-----------------+ |
| | (3) re-injected
| (2a) matching packet | packet
| |
| |
[user mode] | |
....................|...................................|...................
[kernel mode] | |
| |
| |
+---------------+ +----------------->
(1) packet | | (2b) non-matching packet
------------>| WinDivert.sys |-------------------------------------------->
| |
+---------------+
The WinDivert.sys driver is installed below the Windows network stack. The
following actions occur:
(1) A new packet enters the network stack and is intercepted by WinDivert.sys
(2a) If the packet matches the PROGRAM-defined filter, it is diverted. The
PROGRAM can then read the packet using a call to WinDivertRecv().
(2b) If the packet does not match the filter, the packet continues as normal.
(3) PROGRAM either drops, modifies, or re-injects the packet. PROGRAM can
re-inject the (modified) using a call to WinDivertSend().
3. License
----------
WinDivert is dual-licensed under your choice of the GNU Lesser General Public
License (LGPL) Version 3 or the GNU General Public License (GPL) Version 2.
See the LICENSE file for more information.
4. About
--------
WinDivert was written by basil.
For further information, or bug reports, please contact:
basil@reqrypt.org
The homepage for WinDivert is:
https://reqrypt.org/windivert.html
The source code for WinDivert is hosted by GitHub at:
https://github.com/basil00/Divert