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  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Sun, 4 Nov 2012 01:25:13 +0100 (CET)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Vincent Li <vincent.mc.li@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Disable tcp MSS option in three way handshake?


On Friday 2012-10-26 00:42, Eric Dumazet wrote:
>On Thu, 2012-10-25 at 15:27 -0700, Vincent Li wrote:
>> 
>> this sounds crazy, we have a weird situation that an unknown tcp
>> implementation not putting tcp MSS option in the SYN/ACK which caused
>> us some issue. I am tasked to mimic the unknown tcp immplementation on
>> not sending MSS in tcp SYN/ACK, I am wondering if I can achieve that
>> by modifying linux kernel tcp code,  there is socket option
>> TCP_MAXSEG, but that seems only affecting the size of MSS, not
>> removing the MSS option. do you have any pointer on how to do that in
>> kernel tcp code?
>
>You'll have to patch the code.
>
>Or else, you could add a new feature to net/netfilter/xt_TCPMSS.c

Or you could just use -j TCPOPTSTRIP.
--
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

Powered by blists - more mailing lists