netdev - Re: ipv6: Add support for RTA

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Date:	Mon, 11 Apr 2011 09:22:32 +0200
From:	Daniel Walter <dwalter@...racuda.com>
To:	Florian Westphal <fw@...len.de>
CC:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: ipv6: Add support for RTA_PREFSRC

On Thu, 2011-04-07 at 14:25 -0700, Florian Westphal wrote:
> David Miller <davem@...emloft.net> wrote:
> > From: Daniel Walter <dwalter@...racuda.com>
> > Date: Mon, 4 Apr 2011 09:56:44 +0200
> > > This reduces the RTA_PREFSRC support to netlink only, unless
> > > we break the struct.
> > 
> [..]
> > Since you do the prefsrc extraction in at least two places, make a
> > helper function that does the whole "if prefsrc.plen use prefsrc, else
> > use ipv6_dev_get_saddr()"
> > 
> > This would be akin to ipv4's FIB_RES_PREFSRC
> 
> OK, I'll bite.
> 
> Whats wrong with using ipv6 addrlabels to pick the desired address,
> and, if there is a problem, why is it not fixable?
> 
> Just wondering...
Hi,

As far as I've understood addrlabels, they allow me to define the
overall preferred source. As soon I want to select the default src
only for a given route, addrlabels cannot do the job.
for example:
ip-addresses on eth0
2001:0DB8::1/64
2001:0DB8::2/64
routes
2001:0DB8::/64
2001:0DB8:0:dead::/64 via 2001:0DB8::1234/64

addrlabel allow me to set the default source address to 2001:0DB8::1 for
both routes. with pref_src selection one is able to set the default
outgoing address for each route to the needed address, which may be
2001:0DB8::1 for the first route, and 2001:0DB8::2 for the remaining.

Please feel free to correct me if I misunderstood something.

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