netdev - Re: [PATCH] net: Prefer non link-local source addresses

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Date:	Thu, 1 Sep 2011 23:56:27 +0200
From:	David Lamparter <equinox@...c24.net>
To:	Jeff Harris <jeff_harris@...trox.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: Prefer non link-local source addresses

On Thu, Sep 01, 2011 at 04:20:54PM -0400, Jeff Harris wrote:
> Section 2.6.1 of RFC 3927 specifies that if link-local and routable addresses
> are available on an interface, a routable address is preferred.  Update the
> IPv4 source address selection algorithm to use a 169.254.x.x address only if
> another matching address is not found.

> +			if (ipv4_is_linklocal_169(ifa->ifa_address)) {
> +				lladdr = ifa->ifa_local;
> +				continue;
> +			}

IP addresses have a scope field:
# ip -4 a l eth0                                   
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    inet 10.0.0.1/24 brd 10.0.0.255 scope link eth0
    inet 172.22.80.50/25 brd 172.22.80.127 scope global eth0

would it not make sense to use to use that field instead?


-David
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