netdev - Re: [PATCH] net: Provide SYN packet for passive connections

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Message-Id: <20120311.195542.1995263719633128071.davem@davemloft.net>
Date:	Sun, 11 Mar 2012 19:55:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH] net: Provide SYN packet for passive connections

From: Tom Herbert <therbert@...gle.com>
Date: Sun, 11 Mar 2012 19:48:46 -0700 (PDT)

> This patch allows a server application to get the TCP SYN packets for
> its passive connections.  This is useful if the server is doing
> fingerprinting of clients based on SYN packet contents.
> 
> Two socket options are added: TCP_SAVE_SYN and TCP_SAVED_SYN.  The
> first is used on a listener socket to enable saving the SYN packets
> for child connections.  The latter is used to retrieve the SYN for
> and accepted connection.  TCP_SAVED_SYN is read once, it frees the
> saved SYN packet.
> 
> The data returned TCP_SAVED_SYN is the IP header (v4 or v6) through
> the TCP header.
> 
> Signed-off-by: Tom Herbert <therbert@...gle.com>

I dunno, bloating up the socket and the mini-req structure by 8+ bytes
for what's essentially a very fringe feature?
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