netdev - Re: [PATCH] ipv6: fix flow labels when the traffic class is non-0

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Date:   Mon, 30 Jan 2017 15:45:35 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Tom Herbert <tom@...bertland.com>
Cc:     Dimitris Michailidis <dmichail@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH] ipv6: fix flow labels when the traffic class is non-0

On Mon, Jan 30, 2017 at 3:40 PM, Tom Herbert <tom@...bertland.com> wrote:

> Thanks for pointing out the issue, but I don't think this fix is quite
> right. This would be discarding traffic class from being in the return
> value. I can try to fix that.

Fix looks fine to me.

ip6_make_flowlabel() is usually used in an enclosing ip6_flow_hdr(),
which gives the tclass.

ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel,

  np->autoflowlabel, fl6));