From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nicolas Dichtel Subject: Re: [PATCH net-next] ipv6: export IP6_RT_PRIO_* to userland Date: Mon, 05 Nov 2012 18:22:39 +0100 Message-ID: <5097F5DF.7040507@6wind.com> References: <1352129298-1104-1-git-send-email-nicolas.dichtel@6wind.com> <20121105.120017.1189906314924845791.davem@davemloft.net> Reply-To: nicolas.dichtel@6wind.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: netdev@vger.kernel.org To: David Miller Return-path: Received: from mail-bk0-f46.google.com ([209.85.214.46]:34538 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932633Ab2KERWo (ORCPT ); Mon, 5 Nov 2012 12:22:44 -0500 Received: by mail-bk0-f46.google.com with SMTP id jk13so2115698bkc.19 for ; Mon, 05 Nov 2012 09:22:43 -0800 (PST) In-Reply-To: <20121105.120017.1189906314924845791.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-ID: Le 05/11/2012 18:00, David Miller a =E9crit : > From: Nicolas Dichtel > Date: Mon, 5 Nov 2012 16:28:18 +0100 > >> The kernel uses some default metric when routes are managed. For exa= mple, a >> static route added with a metric set to 0 is inserted in the kernel = with >> metric 1024 (IP6_RT_PRIO_USER). >> It is useful for routing daemons to know these values, to be able to= set routes >> without interfering with what the kernel does. >> >> Signed-off-by: Nicolas Dichtel > > But these belong in the libc headers anyways. > > If we haven't provided them for so long, there's no real value of > adding them now. > But how can a daemon know which default values are used? If it wants to= add a=20 route with metric =3D default + x, it should first add it with metric =3D= 0, check=20 the result and then change the metric.