Re: Questions about route realms

[Atis Elsts <atis@xxxxxxxxxxxx>]

On Tuesday 26 January 2010 15:08:09 David Miller wrote:
> From: Atis Elsts <atis@xxxxxxxxxxxx>
> Date: Tue, 26 Jan 2010 14:42:55 +0200
> 
> > Can you try this patch?
> 
> You need to use a special rtnetlink attribute to communicate
> larger than 8-bit values with the kernel.
> 
> I'm not sure iproute2 does that yet, you'd have to make sure
> it does before blindly removing checks like this.
> 
David, if I understand you correctly, that works just fine - RTA_FLOW is a 
"u32" attribute.

However, apparently it's not possible to do traffic classification based on these 
"extended" realms, if that's what the OP wanted - by closer look at 
net/sched/cls_route.c, the <= 0xff check is present there and cannot be 
trivially removed.
The "extended" realms still could be used for traffic matcher in firewall, but I 
guess that it's better to keep unified semantics of the "realm" parameter 
within iproute2 tools. I retract my patch for now.

Atis
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