netdev - Re: net-next-2.6 [PATCH 1/1] tcp: add missing initial window (RFC 3390) for tcp

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Wed, 01 Sep 2010 09:06:10 +0200
From:	Alexander Zimmermann <alexander.zimmermann@...sys.rwth-aachen.de>
To:	Gerrit Renker <gerrit@....abdn.ac.uk>
Cc:	Ilpo J?rvinen <ilpo.jarvinen@...sinki.fi>,
	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: net-next-2.6 [PATCH 1/1] tcp: add missing initial window (RFC
	3390) for tcp_output

Hi Gerrit,

Am 01.09.2010 um 07:34 schrieb Gerrit Renker:

> Please can you have a look, I have checked it, appears to be correct
> and compiles cleanly. Thanks again to Ilpo.
> 
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Patch <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> tcp: update also tcp_output with regard to RFC 5681
> 
> Thanks to Ilpo Jarvinen, his updates also the initial window
> setting for tcp_output with regard to RFC 5681.
> 
> Signed-off-by: Gerrit Renker <gerrit@....abdn.ac.uk>
> ---
> net/ipv4/tcp_output.c |   10 +++-------
> 1 file changed, 3 insertions(+), 7 deletions(-)
> 
> --- a/net/ipv4/tcp_output.c
> +++ b/net/ipv4/tcp_output.c
> @@ -225,15 +225,11 @@ void tcp_select_initial_window(int __spa
> 	}
> 
> 	/* Set initial window to value enough for senders,
> -	 * following RFC2414. Senders, not following this RFC,
> -	 * will be satisfied with 2.
> +	 * following RFC5681 (which updates RFC3390).

In IETF sense, RFC5681 doesn't update RFC3390.

Alex


> 	 */
> 	if (mss > (1 << *rcv_wscale)) {
> -		int init_cwnd = 4;
> -		if (mss > 1460 * 3)
> -			init_cwnd = 2;
> -		else if (mss > 1460)
> -			init_cwnd = 3;
> +		int init_cwnd = rfc3390_bytes_to_packets(mss);
> +
> 		/* when initializing use the value from init_rcv_wnd
> 		 * rather than the default from above
> 		 */
> --
> 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

//
// Dipl.-Inform. Alexander Zimmermann
// Department of Computer Science, Informatik 4
// RWTH Aachen University
// Ahornstr. 55, 52056 Aachen, Germany
// phone: (49-241) 80-21422, fax: (49-241) 80-22221
// email: zimmermann@...rwth-aachen.de
// web: http://www.umic-mesh.net
//


Download attachment "PGP.sig" of type "application/pgp-signature" (196 bytes)