netdev - Re: [PATCH net-next] tcp: socket option to set TCP fast open key

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Message-ID: <CANn89iK-dzwehweSZxVJ1z9YEYnhFMM3URYpARbxr4bUa1Nskg@mail.gmail.com>
Date:   Wed, 18 Oct 2017 13:37:27 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Christoph Paasch <cpaasch@...le.com>
Cc:     Yuchung Cheng <ycheng@...gle.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Neal Cardwell <ncardwell@...gle.com>,
        "maheshb@...gle.com" <maheshb@...gle.com>
Subject: Re: [PATCH net-next] tcp: socket option to set TCP fast open key

On Wed, Oct 18, 2017 at 1:13 PM, Christoph Paasch <cpaasch@...le.com> wrote:
>
> Hello Yuchung,
>
> On 18/10/17 - 11:22:51, Yuchung Cheng wrote:
> > New socket option TCP_FASTOPEN_KEY to allow different keys per
> > listener.  The listener by default uses the global key until the
> > socket option is set.  The key is a 16 bytes long binary data. This
> > option has no effect on regular non-listener TCP sockets.
>
> can you explain what the use-case is to have per-listener TFO keys?
>

Security aspects. You want to be able to change keys whenever you
want, on an application basis.