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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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?
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html