netdev - Re: [PATCH net-next 1/1] net: reflect mark on tcp syn ack packets

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Message-ID: <b6e180c2-b17d-38fd-27cc-6d92ff38e8dd@mojatatu.com>
Date:   Tue, 13 Jun 2017 07:33:40 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Lorenzo Colitti <lorenzo@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        mrv@...atatu.com, hadi@...atatu.com
Subject: Re: [PATCH net-next 1/1] net: reflect mark on tcp syn ack packets

On 17-06-12 08:34 PM, Lorenzo Colitti wrote:
> On Sun, Jun 11, 2017 at 8:58 PM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
>>> Maybe this should both be "inet_request_mark()"?

> As David says, the tcp_fwmark_accept sysctl is not really appropriate
> for synack packets - what it does is ensure that when a connection is
> accepted, sk->sk_mark is set to the mark of the incoming skb.
> 
> I think the correct behaviour here is to to honour the
> ip_fwmark_reflect sysctl instead, and if it's enabled, make the synack
> mark be the same as the the incoming syn mark.
> 

Ok, so in the patch I sent then change this:

+       if (sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
+               skb->mark = ireq->ir_mark;

to:

+       if (sock_net(sk)->ipv4.fwmark_reflect)
+               skb->mark = ireq->ir_mark;

correct?

cheers,
jamal