[TOOL] L7-Filter - Application Layer Packet Classifier for Linux

From: SecuriTeam (support_at_securiteam.com)
Date: 01/25/05

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      L7-Filter - Application Layer Packet Classifier for Linux
    ------------------------------------------------------------------------

    SUMMARY

    DETAILS

    This is a classifier for the Linux kernel's Netfilter subsystem that
    identifies packets based on application layer data (OSI layer 7). This
    means that it can classify packets as HTTP, FTP, Gnucleus, eDonkey2000,
    etc, regardless of port. Our classifier complements existing ones that
    match on address, port numbers and so on.

    The developer's intent is for l7-filter to be used in conjunction with
    Linux QoS to do bandwidth arbitration ("packet shaping").

    Feature Overview:
     * Patches for Linux 2.4 and 2.6
     * Support for TCP, UDP and ICMP over IPv4
     * Uses Netfilter's connection tracking of FTP, IRC, etc
     * Examines data across multiple packets
     * Number of packets examined tunable through /proc/net/layer7_numpackets
     * With the Netfilter helper match, can distinguish between parent (ex.
    ftp command) and child (ex. ftp data) connections
     * Gives access to both Netfilter (firewall) and QoS (rate limiting)
    features
     * Might be in the stock kernel, or at least patch-o-matic, some day

    ADDITIONAL INFORMATION

    The information has been provided by Ethan Sommer and Matthew Strait.
    To keep updated with the tool visit the project's homepage at:
    <http://l7-filter.sourceforge.net/> http://l7-filter.sourceforge.net/

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