[ANNOUNCE] nf-hipac: High Performance Packet Classification for Netfilter
From: Michael Bellion and Thomas Heinz (nf_at_hipac.org)
Date: 07/04/03
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Date: 4 Jul 2003 11:00:22 GMT
Hi
We have released a new version of nf-hipac. We rewrote most of the code
and added a bunch of new features. The main enhancements are
user-defined chains, generic support for iptables targets and matches
and 64 bit atomic counters.
For all of you who don't know nf-hipac yet, here is a short overview:
nf-hipac is a drop-in replacement for the iptables packet filtering
module.
It implements a novel framework for packet classification which uses an
advanced algorithm to reduce the number of memory lookups per packet.
The module is ideal for environments where large rulesets and/or high
bandwidth networks are involved. Its userspace tool, which is also
called 'nf-hipac', is designed to be as compatible as possible to
'iptables -t filter'.
The official project web page is:
http://www.hipac.org
The releases can be downloaded from:
http://sourceforge.net/projects/nf-hipac
Features:
- optimized for high performance packet classification with
moderate memory usage
- completely dynamic: data structure isn't rebuild from scratch
when inserting or deleting rules, so fast updates are possible
- very short locking times during rule updates: packet matching is
not blocked
- support for 64 bit architectures
- optimized kernel-user protocol (netlink): improved rule listing
speed
- libnfhipac: netlink library for kernel-user communication
- native match support for:
+ source/destination ip
+ in/out interface
+ protocol (udp, tcp, icmp)
+ fragments
+ source/destination ports (udp, tcp)
+ tcp flags
+ icmp type
+ connection state
+ ttl
- match negation (!)
- iptables compatibility: syntax and semantics of the userspace
tool are very similar to iptables
- coexistence of nf-hipac and iptables: both facilities can be
used at the same time
- generic support for iptables targets and matches (binary
compatibility)
- integration into the netfilter connection tracking facility
- user-defined chains support
- 64 bit atomic counters
- kernel module autoloading
- /proc/net/nf-hipac/info:
+ dynamically limit the maximum memory usage
+ change invokation order of nf-hipac and iptables
- extended statistics via /proc/net/nf-hipac/statistics/*
We are currently working on extending the hipac algorithm to do
classification with several stages. The hipac algorithm will then be
capable of combining several classification problems in one data
structure, e.g. it will be possible to solve routing and firewalling
with one hipac lookup. The idea is to shorten the packet forwarding path
by combining fib_lookup and iptables filter lookup into one hipac query.
To further improve the performance in this scenario the upcoming flow
cache could be used to cache recent hipac results.
Enjoy,
+-----------------------+----------------------+
| Michael Bellion | Thomas Heinz |
| <mbellion@hipac.org> | <creatix@hipac.org> |
+-----------------------+----------------------+
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