Date: Wed, 6 Jun 2012 19:54:26 +0200 From: Michael Tuexen <Michael.Tuexen@lurchi.franken.de> To: Adrian Chadd <adrian@freebsd.org> Cc: "freebsd-net@freebsd.org mailing list" <freebsd-net@freebsd.org> Subject: Re: IP_RECVTOS Message-ID: <8D7E9322-0973-4657-B3FE-8A480C0E0304@lurchi.franken.de> In-Reply-To: <CAJ-Vmo=BDfQ5_yd=bzBwYr=P7xLeS=mRckncCuGBJPYxz4XRoA@mail.gmail.com> References: <1D03F00E-2777-4B0B-8E1C-860EA115B6AF@lurchi.franken.de> <CAJ-Vmona0kHnOKXdmQDYksqGifmd5Fjgg-YniTcrHFZvZBv--Q@mail.gmail.com> <7731AEE8-D1BF-4297-8F75-454149D3E303@lurchi.franken.de> <CAJ-VmomrqRLkyTCFsgfcAsXC1V4KubsZ3AeY2K%2B6X7u-yjBOoQ@mail.gmail.com> <5A4A73CF-95FB-4B33-9652-2E4FD517CF5F@lurchi.franken.de> <CAJ-Vmo=1o72QB%2B0tBcvO8A37xdzMCsS3JAFa5%2B6DM6%2BwqfQWPA@mail.gmail.com> <5399FCC6-BDC4-47DD-9948-ADD16264EE46@lurchi.franken.de> <CAJ-Vmo=BDfQ5_yd=bzBwYr=P7xLeS=mRckncCuGBJPYxz4XRoA@mail.gmail.com>
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On Jun 6, 2012, at 7:17 PM, Adrian Chadd wrote: > Hi, >=20 > For TCP, I've seen the network layer change things (eg setting bits on > incoming traffic to mark which interface it came in on), so you can't > guarantee the outbound ToS =3D=3D inbound ToS. I've not said that inbound =3D=3D outbound... I just wanted to make = clear that there is a socket option of setting the TOS byte for outgoing traffic. The TCP stack might overwrite the ECN bits... I need the IP_RECVTOS functionality for implementing a transport stack = supporting ECN in userland, actually running the SCTP kernel sources (with some = glue code) in userland on top of UDP... Best regards Michael >=20 >=20 >=20 > Adrian >=20
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