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From: David Miller <davem@davemloft.net>
Subject: Re: GTSM and TCP accept problem
Date: Wed, 18 Aug 2010 14:48:37 -0700 (PDT)
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From: Stephen Hemminger <shemminger@vyatta.com>
Date: Wed, 18 Aug 2010 14:39:13 -0700

> On Mon, 16 Aug 2010 11:43:45 +0200
> Eric Dumazet <eric.dumazet@gmail.com> wrote:
> 
>> Another idea would be to store the TTL of the SYN packet (or third
>> packet) and let application read it after accept(), allowing it to
>> reject the connection if it doesnt match expected TTL.
> 
> could be in tcp_info?

I'm sure we can squeeze a byte out of there :-)