netdev - Re: [PATCH net 2/2] tcp: make global challenge ack rate limitation per net-ns and default disabled

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Date:   Wed, 31 Aug 2022 08:59:50 -0400
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>, Jason Baron <jbaron@...mai.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net 2/2] tcp: make global challenge ack rate limitation
 per net-ns and default disabled

On Tue, Aug 30, 2022 at 2:57 PM Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> From: Eric Dumazet <edumazet@...gle.com>
>
> Because per host rate limiting has been proven problematic (side channel
> attacks can be based on it), per host rate limiting of challenge acks ideally
> should be per netns and turned off by default.
>
> This is a long due followup of following commits:
>
> 083ae308280d ("tcp: enable per-socket rate limiting of all 'challenge acks'")
> f2b2c582e824 ("tcp: mitigate ACK loops for connections as tcp_sock")
> 75ff39ccc1bd ("tcp: make challenge acks less predictable")
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Jason Baron <jbaron@...mai.com>
> Cc: Neal Cardwell <ncardwell@...gle.com>
> ---

Acked-by: Neal Cardwell <ncardwell@...gle.com>

Looks great. Thanks, Eric!

neal