netdev - Re: [PATCH net-next] tcp: accept RST if SEQ matches right edge of SACK block

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Date:	Fri, 03 Jun 2016 08:13:56 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pau Espin <pau.espin@...sares.net>
Cc:	netdev <netdev@...r.kernel.org>, Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [PATCH net-next] tcp: accept RST if SEQ matches right edge of
 SACK block

On Fri, 2016-06-03 at 14:16 +0200, Pau Espin wrote:
> I will provide a new patch as soon as I find some time to do it.
> 
> Indeed, I think there is no need to check duplicate_sack, I will remove it.
> 
> I will also update the description.
> 
> Shall I also add a sysctl to disable this patch and still be able to
> stick strictly to RFC 5961 3.2 for the checks?

I have no strict opinion on this.

It seems to me that checking at most 4 right edges (at least in current
linux implementation) is not adding a huge risk, and allows for better
interoperability.

I vote for no extra sysctl.