Re: [linux-vrf-core] First code release

[James R. L. <jl...@mi...>]

On Wed, Mar 06, 2002 at 04:16:43PM -0500, Nick Eggleston wrote:
> Jim,
> 
> Could you take a few minutes and type up a note that describes from a
> system level the way you have implemented this?  How are you
> conceptualizing the kernel mods to support the vrfs?

The base change of this implementation is make the fib_table array
a double index array.  Prior to this it was only indexed by the table id.
I added a vrf id.  So everywhere that create/gets/modifies a table had to
have an extra piece of info added to the call.

The other change to the 'fib' is that the fib_rules are now index by vrf
as well.  fib_rules are the structuire behind maintaining the order in which
tables do route lookups.  (ie the local table alway is looked up before the
main table, whicb is before the default table).  By allowing VRFs to have
rules, policy routing and teh like still work within a VRF (I think
NAT will work as well!).

The next large change is how the tcp/udp/raw sockets account for used port
numbers.  Every where a lookup or a comparison is made I add the vrf to
the mix.

The other place where VRF show s up, the route cache, route messages, 
link messages, rules messages, socket hash tables, skbs.

This is a very quick overview.  I will try to come up with a better one
and add it to the README.  Maybe some of the questions you guys come back
with will hlep form this description.

Jim

> Thanks!
> 
> Nick
> 
> On Wed, 6 Mar 2002, James R. Leu wrote:
> 
> > Hey guys,
> >
> > I know its been a LONG time since we talked about this, but I have been
> > thinking about it, and I've done some work.  I placed my first crack at a
> > VRF implementation for the kernel.  Take a look at the README inside it
> > then post questions :-)
> >
> > Jim
> >
> 

-- 
James R. Leu