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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH 1/7] net-tcp: Fast Open base
Date: Mon, 16 Jul 2012 23:16:44 -0700 (PDT)
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From: Yuchung Cheng <ycheng@google.com>
Date: Mon, 16 Jul 2012 14:16:44 -0700

> +#define TCPOPT_EXP		254	/* Experimental */
> +/* Magic number to be after the option value for sharing TCP
> + * experimental options. See draft-ietf-tcpm-experimental-options-00.txt
> + */
> +#define TCPOPT_FASTOPEN_MAGIC	0xF989

If I apply this, we're stuck supporting this experimental number
forever.

Because somewhere, someone will have a kernel running using this
number, so we have to support this option value as well as whatever
the official one is.

Therefore I think the only logical thing we can do is only deploy
this once an official option number is choosen.