netgraph(4) divert(4) to UDP Tunnel

From: Crist J. Clark (cristjc_at_comcast.net)
Date: 11/13/03

  • Next message: Crist J. Clark: "Re: IPSec VPN & NATD (problem with alias_address vs redirect_address)" 
    Date: Thu, 13 Nov 2003 12:24:35 -0800
To: net@freebsd.org

    I'm trying to play around with netgraph(4) for the first time and
    there seem to be some aspects of it that haven't "clicked" in my head
    just yet.

    What I want to do seems like it should be pretty easy. I want to
    send some packets through a UDP tunnel. There is an
    /usr/share/examples/netgraph/udp.tunnel file that is close to what I
    want, but not quite. I want to send packets that have been divert(4)ed
    to the tunnel.

    I can make my two ng_ksocket(8) nodes via the ngctl(8) interface,

     + mkpeer ksocket d0 inet/dgram/udp
     + name d0 udptun
     + msg d0 bind inet/192.168.64.70:10000
     + msg d0 connect inet/192.168.64.50:10000
     + mkpeer ksocket d1 inet/raw/divert
     + name d1 divtun
     + msg d1 bind inet/0.0.0.0:8668

    But how do I then connect the two of them up? I assume that I use
    'connect' within ngctl(8), but I haven't figured out what the
    arguments need to be with the documentation and examples I've found.

    The other thing I suspect I should be doing, is actually running the
    'mkpeer' through the first node I create in ngctl(8), but I can't seem
    to get that to work,

     + mkpeer ksocket d0 inet/dgram/udp
     + name d0 udptun
     + msg d0 bind inet/192.168.64.70:10000
     + msg d0 connect inet/192.168.64.50:10000
     + mkpeer d0 ksocket d1 inet/raw/divert
     ngctl: send msg: Socket is already connected

    I think it is actually complaining about the hook between my ngctl
    node and the udptun node and not the creation of the divert socket?

    Basically, I think my conceptual problem is with the fact that you
    start with the ngctl(8) node in the middle of everything. How do I
    create my new nodes and get the ngctl(8) node out of the middle? 

    -- 
Crist J. Clark                     |     cjclark@alum.mit.edu
                                   |     cjclark@jhu.edu
http://people.freebsd.org/~cjc/    |     cjc@freebsd.org
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  • Next message: Crist J. Clark: "Re: IPSec VPN & NATD (problem with alias_address vs redirect_address)"

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