netdev - Re: [PATCH net] ipv6: stop sending PTB packets for MTU

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Message-Id: <20150119.145058.954790496532942109.davem@davemloft.net>
Date:	Mon, 19 Jan 2015 14:50:58 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hagen@...u.net
Cc:	hannes@...essinduktion.org, netdev@...r.kernel.org,
	stable@...r.kernel.org, fgont@...networks.com
Subject: Re: [PATCH net] ipv6: stop sending PTB packets for MTU < 1280

From: Hagen Paul Pfeifer <hagen@...u.net>
Date: Mon, 19 Jan 2015 15:00:21 +0100

> On 19 January 2015 at 14:55, Hannes Frederic Sowa
> <hannes@...essinduktion.org> wrote:
>> Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
>>
>> I think this is the correct way forward on how to deal with atomic
>> fragments.
>>
>> Hagen, do you submit patches to remove dst_allfrag/RTAX_FEATURE_ALLFRAG,
>> IPCORK_ALLFRAG, etc. for net-next, too?
> 
> Yes, patch sits already in the pipe. I wanted to wait for davem's pull.

It's one thing to change policy about how we might or might not
automatically set this bit in the kernel, but at a minimum you cannot
just remove RTAX_FEATURE_ALLFRAG, it's in a userspace header and
you'll break application builds.

Second of all, there is absolutely no reason to prevent the user from
setting this bit.  If someone wants to set RTAX_FEATURE_ALLFRAG on a
route on their own system, that is their business.
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