Re: Julian's netowrking challenge 2005

From: Max Laier (max_at_love2party.net)
Date: 06/28/05

  • Next message: Milan Obuch: "Re: Julian's netowrking challenge 2005" 
    To: Jeremie Le Hen <jeremie@le-hen.org>
Date: Tue, 28 Jun 2005 12:37:56 +0200

    On Tuesday 28 June 2005 12:27, Jeremie Le Hen wrote:
    > > Wouldn't a more general approach be better. e.g. a way to "tag" a packet
    > > before it is sent to divert and a matching tag-lookup that can do further
    > > action. This would make it very easy to do all kinds of stuff that needs
    > > to know the original address instead of the translated one while avoiding
    > > code duplication.
    >
    > Having the possibility to tag a packet would be worth indeed. But I
    > think that Milan wants to bring network stack virtualization in
    > newer release of FreeBSD IIUC. This would be, IMO, a great improvement
    > of FreeBSD networking, although I'm pretty sure this would make Netgraph
    > people react a bit ;-).

    Stack virtualization is independent of this. All I am trying to say here, is
    that I think it is better to have a general mechanism to do thing like that,
    instead of a special solution for fwd (i.e. set-nexthop).

    > > pf does something along these lines in case you are looking for
    > > references.
    >
    > Would it be possible to share this tag among pf and ipfw ?

    Sure, it's a simple mbuf tag with a (at this point) 16bit cookie. The
    downside of this approach is that you need to malloc the tag, but on the
    other hand it's even more complicated for set-nexthop where you need to
    allocate a route and maybe even hold it for some time and make sure you
    properly GC it ... tags seem way simpler to me. 

    -- 
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  • Next message: Milan Obuch: "Re: Julian's netowrking challenge 2005"

    Relevant Pages

    • Re: Julians netowrking challenge 2005
      ... Jeremie Le Hen wrote: ... >Having the possibility to tag a packet would be worth indeed. ... >newer release of FreeBSD IIUC. ...
      (freebsd-net)
    • Re: Julians netowrking challenge 2005
      ... >> Having the possibility to tag a packet would be worth indeed. ... >> of FreeBSD networking, although I'm pretty sure this would make Netgraph ... > Stack virtualization is independent of this. ...
      (freebsd-net)