netdev - Re: vpnc-script fix for changed iproute output with newer kernels

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Date:	Fri, 29 Jul 2011 13:57:03 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	David Miller <davem@...emloft.net>
Cc:	jsbronder@...too.org, netdev@...r.kernel.org, shemminger@...tta.com
Subject: Re: vpnc-script fix for changed iproute output with newer kernels

On Fri, 2011-07-29 at 05:46 -0700, David Miller wrote:
> From: David Woodhouse <dwmw2@...radead.org>
> Date: Fri, 29 Jul 2011 13:33:11 +0100
> 
> > Any suggestions that *aren't* going to be constantly broken?
> 
> You're going to have to be knowledgable about which attributes are
> part of the route, whether you want to do this with iproute2 as a tool
> or whether you do this directly with C code using netlink.

I don't think I really want to try shipping vpnc-script with C code.

The 'opt-in' approach seems like the best one for now, then. I suppose
we want just the 'via' and 'dev' and 'src' attributes... anything else?

I'll see if I can come up with a regex that can parse that, in the
knowledge that the interface itself might actually be called "src" or
"dev" or "via".

This may make my brain hurt.

> iproute2 is never going to allow you to mirror "route get" outputs
> into a "route add" call.  Because 'get' is going to always emit
> metrics and other transient state, upon which we will always
> potentially be buidling new items over time.

An option to make 'ip route get' do exactly that would be massively
appreciated :)

Or an option to make 'ip route set' ignore the ones it doesn't like,
perhaps.

-- 
dwmw2

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