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Date:   Tue, 13 Jun 2017 07:33:40 -0400
From:   Jamal Hadi Salim <>
To:     Lorenzo Colitti <>
Cc:     David Miller <>,
        "" <>,,
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 <> 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;


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



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