netdev - Re: [PATCH] ipv6: do not add link-local address if one already exists

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Message-ID: <c612bb8cad5480b08919e32f39c6d6ea@mail.marples.name>
Date:	Mon, 11 Aug 2014 00:05:13 +0000
From:	Roy Marples <roy@...ples.name>
To:	Hannes Frederic Sowa <hannes@...hat.com>
Cc:	netdev@...r.kernel.org,
	"\"David S. Miller\\" <davem@...emloft.net>,
	Alexey Kuznetsov "\"\"" <kuznet@....inr.ac.ru>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	"\"Patrick"@marples.name, McHardy@...ples.name,
	" <kaber@...sh.net>"@marples.name
Subject: Re: [PATCH] ipv6: do not add link-local address if one already exists

Hi

On 2014-08-10 20:37, Hannes Frederic Sowa wrote:
> On So, 2014-08-10 at 19:56 +0000, Roy Marples wrote:
>> Currently the kernel will always add an IPv6 link-local address
>> based on the hardware address when the interface is brought up.
>> This is probably based on the assumption that userland would
>> never add one before the interface is brought up.
>> 
>> However, one at least one userland application (dhcpcd) does this so
>> it can implement RFC7217 which can be used for link-local addresses
>> as well.
>> 
>> Attached is a patch which checks to see if a link-local address exists
>> before indiscriminately adding one.
> 
> Please have a look at:
> https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=bc91b0f07ada5535427373a4e2050877bcc12218
> 
> This was recently implemented just for this specific case.

Is that tunable available in /proc or /sys?
I'm not overly keen on adding a netlink call just for that in dhcpcd, it 
would be a lot of bloat compared to the kernel patch.

Roy
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