linux-kernel - Re: [PATCH net-next 5/5] ipv6: Compute multipath hash for forwarded ICMP errors from offending packet

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Message-ID: <7f83a405-0520-a3ed-fc21-402d702483f9@stressinduktion.org>
Date:   Tue, 1 Nov 2016 17:27:56 +0100
From:   Hannes Frederic Sowa <hannes@...essinduktion.org>
To:     David Miller <davem@...emloft.net>, jkbs@...hat.com
Cc:     tom@...bertland.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru,
        jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [PATCH net-next 5/5] ipv6: Compute multipath hash for forwarded
 ICMP errors from offending packet

On 01.11.2016 16:35, David Miller wrote:
> I have a really hard time accepting a "fix" that depends upon behavior
> that the Linux ipv6 stack doesn't even have.

We actually support this feature:

commit df3687ffc6653e4d32168338b4dee20c164ed7c9
Author: Florent Fourcot <florent.fourcot@...t-bretagne.fr>
Date:   Fri Jan 17 17:15:03 2014 +0100

    ipv6: add the IPV6_FL_F_REFLECT flag to IPV6_FL_A_GET

Add that time I tried to stick to the common practices at that time and
was against any kind of global sysctl enabling a reflection mode for
flowlabels. State of art was to keep some uniqueness in flowlabels, thus
also the introduction of the flowlabel_consistency label.

We basically can support reflection nowadays globally pretty easy, as we
have soften these rules a lot.

Bye,
Hannes