Date: Thu, 13 Dec 2007 00:21:55 +0100 From: Max Laier <max@love2party.net> To: Julian Elischer <julian@elischer.org> Cc: freebsd-net@freebsd.org Subject: Re: bikeshed for all! Message-ID: <200712130021.56473.max@love2party.net> In-Reply-To: <47606BD0.7050005@elischer.org> References: <476061FD.8050500@elischer.org> <200712130007.20720.max@love2party.net> <47606BD0.7050005@elischer.org>
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On Thursday 13 December 2007, Julian Elischer wrote:
> Max Laier wrote:
> > On Wednesday 12 December 2007, Julian Elischer wrote:
> >> So, I'm playing with some multiple routing table support..
> >> the first version is a minimal impact version with very limited
> >> functionality. It's done that way so I can put it in RELENG_6/7
> >> without breaking ABIs (I hope). Later there will be a more flexible
> >> version for-current.
> >>
> >> Here's the question..
> >>
> >> I need a word to use to describe the network view one is currently
> >> on.. e.g. if you are usinghe second routing table, you could say
> >> I've set xxx to 1 (0 based)..
> >>
> >>
> >> current;y in my code I'm using 'universe' but I don't like that..
> >>
> >> one could think of it as a routing plane..
> >> each routing plane has he same interfaces on it but they are
> >> logically treated differently becasue each plane has a different
> >> routing table.
> >>
> >>
> >> so here's an axample of it in use now...
> >> the names should change...
> >>
> >> setuniverse 1 netstat -rn
> >> [shows table 1]
> >> setuniverse 2 route add 10.0.0.0/24 192.168.2.1
> >> setuinverse 1 route add 10.0.0.0/24 192.168.3.1
> >> setuniverse 2 route -n get 10.0.0.3
> >> [shows 192.168.2.1]
> >> setuniverse 1 route -n get 10.0.0.3
> >> [shows 192.168.3.1]
> >> setuniverse 2 start_apache
> >> [appache starts, always using 192.168.2.1 to reach the 10.0.0 net.
> >>
> >>
> >> also the syscall is setuniverse()
> >>
> >> so, you see I really need a better name....
> >> setrtab?
> >>
> >> rtab? rtbl?
> >>
> >> and the command should be called "????"
> >
> > FWIW, OpenBSD just added a "-T num" switch to concerned programs like
> > route and netstat. As far as I can tell they rely entirely on pf to
> > select a table - so there is no way to start a program "inside" a
> > certain network view. OTOH, how - in your system - would you decide
> > which table to use for forwarded packets?
>
> ipfw/pf/ipf rule (not yet added) :-)
pf has ifdef'ed out code to deal with the OpenBSD version of routing=20
tables. What it does is adding an mbuf_tag which carries the tableid and=20
ip_{{in,out}put,forward} take action accordingly.
> > More to the bikeshed pov, "universe" seems rather broad. "netview"
> > comes to mind. "rtabselect", though that has a lot of characters,
> > but then again "setuniverse" is even one char longer ;)
=2D-=20
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