From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx3-rdu2.redhat.com ([66.187.233.73]:44864 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752313AbeB0XWV (ORCPT ); Tue, 27 Feb 2018 18:22:21 -0500 Date: Wed, 28 Feb 2018 00:22:18 +0100 From: Sabrina Dubroca To: David Miller Cc: dsahern@gmail.com, netdev@vger.kernel.org Subject: Re: [PATCH net-next] ipv6: allow userspace to add IFA_F_OPTIMISTIC addresses Message-ID: <20180227232218.GA2574@bistromath.localdomain> References: <20180226165619.GA10603@bistromath.localdomain> <20180226.121127.2237252602192340288.davem@davemloft.net> <20180227141328.GA15131@bistromath.localdomain> <20180227.104708.1983037304358643327.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20180227.104708.1983037304358643327.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-ID: 2018-02-27, 10:47:08 -0500, David Miller wrote: > From: Sabrina Dubroca > Date: Tue, 27 Feb 2018 15:13:28 +0100 > > > 2018-02-26, 12:11:27 -0500, David Miller wrote: > >> From: Sabrina Dubroca > >> Date: Mon, 26 Feb 2018 17:56:19 +0100 > >> > >> That's completely different to this case, which is a bonfide explicit > >> allowance for userspace to take over these fundamental protocol tasks > >> from the kernel. > > > > This is not letting userspace take over. On the contrary, it allows > > userspace to take advantage of the kernel's DAD, without suffering the > > delay. The alternative, without optimistic DAD, would be to completely > > disable DAD done by the kernel. > > > > This follows RFC 4429, which explicitly allows optimistic DAD for > > addresses generated by (among other mechanisms) DHCPv6. > > Fair enough. > > We can resume this conversation if and when problems pop up in the > future :-) Hehe :) Thanks, I'll submit a v2 with the changes (the other) David asked for. -- Sabrina