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Date:   Tue, 08 Sep 2020 20:20:33 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] ip: fix tos reflection in ack and reset packets

From: Wei Wang <>
Date: Tue,  8 Sep 2020 14:09:34 -0700

> Currently, in tcp_v4_reqsk_send_ack() and tcp_v4_send_reset(), we
> echo the TOS value of the received packets in the response.
> However, we do not want to echo the lower 2 ECN bits in accordance
> with RFC 3168 6.1.5 robustness principles.
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Wei Wang <>
> Signed-off-by: Eric Dumazet <>

Applied and queued up for -stable, thanks.

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