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Re: [Ecn-in-quic] Darwin issue with setting ECN/DCSP via sendmsg

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Wed, 29 November 2017 14:40 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "Eggert, Lars" <lars@netapp.com>, "ecn-in-quic@ietf.org" <ecn-in-quic@ietf.org>, Stuart Cheshire <cheshire@apple.com>
Thread-Topic: Darwin issue with setting ECN/DCSP via sendmsg
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Date: Wed, 29 Nov 2017 14:39:56 +0000
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Subject: Re: [Ecn-in-quic] Darwin issue with setting ECN/DCSP via sendmsg
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Thanks Lars, and we definitely need more mailing list abuse like this 😊

/Ingemar

> -----Original Message-----
> From: Ecn-in-quic [mailto:ecn-in-quic-bounces@ietf.org] On Behalf Of
> Eggert, Lars
> Sent: den 29 november 2017 15:35
> To: ecn-in-quic@ietf.org; Stuart Cheshire <cheshire@apple.com>
> Subject: [Ecn-in-quic] Darwin issue with setting ECN/DCSP via sendmsg
> 
> Hi,
> 
> sorry for abusing this list. In order to play with ECN and QUIC, I've added
> support for being able to set ECN (and DSCP) fields on the UDP packets I
> generate.
> 
> The good news is that the socket option calls to set the default for a socket
> are exactly the same on Linux, FreeBSD and Darwin, and it works on all
> platforms.
> 
> The other good news is that receiving per-packet ECN (and DSCP)
> information on inbound packets received via recvmsg/recvmmsg is almost
> identical on all three platforms (Linux uses a slightly different option name
> than the other two), and it also works everywhere.
> 
> Sending packets with per-packet ECN (and DCSP) information by initializing
> "struct cmsghdr" information for sendmsg/sendmmsg also uses the same
> API on all three platforms. However, it only seems to work on Linux and
> FreeBSD.
> 
> On Darwin, there is no error, but the outbound packets are *not* marked as
> indicated in the accompanying "struct cmsghdr".
> 
> In case this is of interest to anyone.
> 
> Lars

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