From owner-freebsd-net@FreeBSD.ORG  Wed Mar 27 12:20:01 2013
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@smarthost.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115])
 by hub.freebsd.org (Postfix) with ESMTP id 57C409C5
 for <freebsd-net@smarthost.ysv.freebsd.org>;
 Wed, 27 Mar 2013 12:20:01 +0000 (UTC)
 (envelope-from gnats@FreeBSD.org)
Received: from freefall.freebsd.org (freefall.freebsd.org
 [IPv6:2001:1900:2254:206c::16:87])
 by mx1.freebsd.org (Postfix) with ESMTP id 48D806EF
 for <freebsd-net@smarthost.ysv.freebsd.org>;
 Wed, 27 Mar 2013 12:20:01 +0000 (UTC)
Received: from freefall.freebsd.org (localhost [127.0.0.1])
 by freefall.freebsd.org (8.14.6/8.14.6) with ESMTP id r2RCK1vm078944
 for <freebsd-net@freefall.freebsd.org>; Wed, 27 Mar 2013 12:20:01 GMT
 (envelope-from gnats@freefall.freebsd.org)
Received: (from gnats@localhost)
 by freefall.freebsd.org (8.14.6/8.14.6/Submit) id r2RCK1tW078943;
 Wed, 27 Mar 2013 12:20:01 GMT (envelope-from gnats)
Date: Wed, 27 Mar 2013 12:20:01 GMT
Message-Id: <201303271220.r2RCK1tW078943@freefall.freebsd.org>
To: freebsd-net@FreeBSD.org
Cc: 
From: Michael Tuexen <tuexen@freebsd.org>
Subject: Re: kern/177362: [netinet] [patch] Wrong control used to return TOS
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
Reply-To: Michael Tuexen <tuexen@freebsd.org>
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 27 Mar 2013 12:20:01 -0000

The following reply was made to PR kern/177362; it has been noted by GNATS.

From: Michael Tuexen <tuexen@freebsd.org>
To: Mark Andrews <marka@isc.org>
Cc: bug-followup@FreeBSD.org
Subject: Re: kern/177362: [netinet] [patch] Wrong control used to return TOS
Date: Wed, 27 Mar 2013 13:16:30 +0100

 On Mar 27, 2013, at 12:54 PM, Mark Andrews wrote:
 
 >=20
 > In message <25EB2335-645C-42ED-B90A-6D07A33280DB@freebsd.org>, Michael =
 Tuexen w
 > rites:
 >> It was not done by accident. The returned cmsg_type is IP_RECVTOS =
 instead=20
 >> of IP_TOS to keep it consistent with the handling of the IP_RECVTTL =
 socket=20
 >> option.
 >> I found it more important to be consistent within the same protocol =
 family
 >> than across different ones.
 >> I think that unfortunately IP_RECVTOS is not defined in any standard.
 >>=20
 >> Best regards
 >> Michael
 >=20
 > And Linux uses IP_TOS to return the value.
 ... which is consistent with the IP_RECVTTL socket option on Linux, =
 where it returns
 a cmsg with cmsg_type IP_TTL, which is also different from how this is =
 handled in
 FreeBSD.
 
 I think Solaris uses for IPv4 socket options the same cmsg_type
 as the optname for the socket option to enable the reception of the =
 cmsg.
 
 So it looks like there is no standard here, Linux, FreeBSD and Solaris
 are each consistent with itself, but Linux does it differently from
 FreeBSD and Solaris.
 
 Best regards
 Michael
 >=20
 > --=20
 > Mark Andrews, ISC
 > 1 Seymour St., Dundas Valley, NSW 2117, Australia
 > PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org
 >=20