netdev - Re: [PATCH net-next 2/5] tcp: TFO: search for correct cookie and accept data

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Message-ID: <80ac109a-6e97-e24b-beea-37c047be4f55@gmail.com>
Date:   Sun, 16 Dec 2018 22:30:51 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Christoph Paasch <cpaasch@...le.com>, netdev@...r.kernel.org
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next 2/5] tcp: TFO: search for correct cookie and
 accept data



On 12/14/2018 02:40 PM, Christoph Paasch wrote:
> This change allows to search for the right cookie and accepts old ones
> (announcing a new one if it has changed).
> 
> __tcp_fastopen_cookie_gen_with_ctx() allows to generate a cookie based
> on a given TFO-context. A later patch will cleanup the duplicate code.

How long is kept the secondary (old) context ?

I do not know exact crypto_cipher_encrypt_one() cost, but it looks like
your patch could double the cost of some TFO based attacks ?