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Date: Wed, 13 Jun 2012 15:12:50 +0200
From: Andre Oppermann <andre@freebsd.org>
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To: Michael Tuexen <tuexen@FreeBSD.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org
Subject: Re: svn commit: r236959 - in head: share/man/man4 sys/netinet
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On 12.06.2012 16:02, Michael Tuexen wrote:
> Author: tuexen
> Date: Tue Jun 12 14:02:38 2012
> New Revision: 236959
> URL: http://svn.freebsd.org/changeset/base/236959
>
> Log:
>    Add a IP_RECVTOS socket option to receive for received UDP/IPv4
>    packets a cmsg of type IP_RECVTOS which contains the TOS byte.
>    Much like IP_RECVTTL does for TTL. This allows to implement a
>    protocol on top of UDP and implementing ECN.

You may want to consider to alias IP_RECVTOS with IP_TOS as it is
done with IP_SENDSRCADDR+IP_RECVDSTADDR to allow for simpler replying
of received UDP packets.  That way IP_RECVTOS has the same ip socket
option number and it can be used for direct TOS reflection.

-- 
Andre