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

From: Hannes Frederic Sowa
Date: Tue Nov 01 2016 - 12:28:04 EST

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@xxxxxxxxxxxxxxxx>
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.