From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Perches <joe@perches.com>
Subject: Re: [PATCH] Add sysctl to set the advertised TCP initial receive
 window.
Date: Thu, 10 Dec 2009 10:55:33 -0800
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To: Stephen Hemminger <shemminger@vyatta.com>
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On Thu, 2009-12-10 at 08:57 -0800, Stephen Hemminger wrote:
> You could use the hole in the structure:
>                 snd_wscale : 4, /* Window scaling received from sender  */
>                 rcv_wscale : 4; /* Window scaling to send to receiver   */
> +	u8	init_rcv_wnd;	/* TCP initial receive window in MSS */
> /*      SACKs data      */
>         u8      num_sacks;      /* Number of SACK blocks        

That hole got filled by tcp cookies.