Basic software to help me build a network appliance - Embedded

This is a discussion on Basic software to help me build a network appliance - Embedded ; Hi, I posted this a while back but didn't get any responses. Perhaps I didn't state my problem well enough, so I'd like to retry again w/ a better problem definition. I'm looking for any free (or low cost) software ...

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Thread: Basic software to help me build a network appliance

  1. Basic software to help me build a network appliance

    Hi,

    I posted this a while back but didn't get any responses. Perhaps
    I didn't state my problem well enough, so I'd like to retry again w/
    a better problem definition.

    I'm looking for any free (or low cost) software that can help me
    build my network appliance. What I need is simply:

    1. Something that redirects/passes Ethernet frames as seen by the
    interface into my C/C++ program. I need to set the interface to
    promiscuous mode at times. These Ethernet frames should be sent
    to my program before being passed to the Linux Kernel by the
    network device (if possible, i.e. as early on as possible).

    2. My program needs to be able to construct Ethernet frames and
    send it out on an interface.

    3. My system is a Pentium 4 1.8GHz with 256MB RAM and dual
    Intel gigE interfaces running Linux 2.6.x (w/ just the kernel and the
    min. development setup, I can put additional software in if needed).

    3. Currently I'm using libpcap and libnet for the above tasks. But
    these libraries performance is not high enough because I'm dropping
    some frames when I put the system into promiscuous mode and
    get traffic that's ony about 15Mbps. (I'd like to get as close to
    100Mbps
    as possible.)

    Thanks in advance for your help.
    If I receive any emailed answers, I will post a summary. My email
    address is frank_6014 at yahoo (with the .com)


  2. Re: Basic software to help me build a network appliance

    Previously I posted asking if there is any free software available that
    allows me to filter network traffic and inject new traffic on the
    Ethernet frame level on my PC (network appliance) based on Linux.
    Mainly, I wanted to replace the libpcap and libnet that I was using at
    the time because of a lack of performance w/ those libs.

    I mentioned I'd post a summary of anything I received...

    Anyway, I didn't get any responses so I wrote a basic kernel driver
    that uses memory mapping to transfer the Ethernet frames intercepted on
    any of my computer's interfaces to my user-space programs. this module
    replaced libnet and libpcap and solved my performance issue. The
    driver communicates w/ user-space programs thru as char device (similar
    to vtun but with flexible filtering). Also wrote a C library that
    provides high level access to the driver.

    If anyone's interested, I can let you use it (send email to me
    frank_6014 at yahoo) since I can't find any existing softwrae and
    nobody's replied to my numerous posts... so either nobody wants this or
    there aren't any free ones.


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