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Date:   Thu, 24 Sep 2020 20:16:38 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] tcp: skip DSACKs with dubious sequence ranges

From: Priyaranjan Jha <>
Date: Thu, 24 Sep 2020 15:23:14 -0700

> From: Priyaranjan Jha <>
> Currently, we use length of DSACKed range to compute number of
> delivered packets. And if sequence range in DSACK is corrupted,
> we can get bogus dsacked/acked count, and bogus cwnd.
> This patch put bounds on DSACKed range to skip update of data
> delivery and spurious retransmission information, if the DSACK
> is unlikely caused by sender's action:
> - DSACKed range shouldn't be greater than maximum advertised rwnd.
> - Total no. of DSACKed segments shouldn't be greater than total
>   no. of retransmitted segs. Unlike spurious retransmits, network
>   duplicates or corrupted DSACKs shouldn't be counted as delivery.
> Signed-off-by: Priyaranjan Jha <>
> Signed-off-by: Neal Cardwell <>
> Signed-off-by: Yuchung Cheng <>
> Signed-off-by: Eric Dumazet <>

Applied and queued up for -stable, thanks.

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