linux-kernel - Re: [PATCH] ip6_tunnel: Correct tos value in collect

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Date:   Wed, 14 Jun 2017 15:28:39 +1000
From:   Peter Dawson <petedaws@...il.com>
To:     严海双 <yanhaishuang@...s.chinamobile.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>,
        Patrick McHardy <kaber@...sh.net>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ip6_tunnel: Correct tos value in collect_md mode

On Wed, 14 Jun 2017 10:54:31 +0800
严海双 <yanhaishuang@...s.chinamobile.com> wrote:

> > Changes since v2:
> >  * mask key->tos with RT_TOS() suggested by Daniel

Can you help me understand the rationale for this change? Is there are bug introduced by dsfield = ip6_tclass(key->label); ?

The RT_TOS masks out 4bits of the 8bit tos field in accordance with RFC1349 (obsoleted by RFC2474). IPv6 does not have a TOS field. So it dosen't make sense to apply a TOS value to the outer header of an IPv6 tunnel.