interface FIB

[Igor Sysoev]

On Fri, Nov 27, 2009 at 09:12:37PM -0800, Julian Elischer wrote:

> Igor Sysoev wrote:
> > Currently only packets generated during encapsulation can use
> > interface's FIB stored during interface creation:
> > 
> > setfib 1 ifconfig gif0 ...
> > setfib 1 ifconfig tun0 ...
> 
> not sure if tun actually does this (in fac tit shouldn't)
> 
> but for gre and gif (and stf) these are tunnelling other things into 
> IP and thus it makes sense to be able to connect a routing table with 
> the generated envelopes.

I've got this from 8.0 release notes:

   A packet generated on tunnel interfaces such as gif(4) and tun(4) will
   be encapsulated using the FIB of the process which set up the tunnel.

However, sys/net/if_tun.c is really has no FIB related changes.

> > is it possible to implement this feature for any interface:
> > 
> > setfib 1 ifconfig vlan0 ...
> > 
> > or
> > 
> > ifconfig vlan0 setfib 1 ...
> 
> these two things would mean differnt things.
> and one of them wouldn't mean anything.
> 
> setfig 1 ifconfig vlan0 woudl mean "what" exactly?
> VLAN tagging is an L2/L1 operation and FIBS have no effect on this.
> 
> as for ifconfig vlan0 setfib 1, or  ifconfig em0 setfib 1
> 
> this will (shortly) mean that incoming packets through this interface 
> will be default be connected with fib 1 so the any return packets 
> (resets, icmp etc.) will use FIB1 to go back to the sender.

This is exactly what I meant.

> That patch is in the works.

I'm ready to test the patch in production on 7/8-STABLE if the patch
can be applied to it.


-- 
Igor Sysoev
http://sysoev.ru/en/