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Re: [tcpm] Progressing draft-ietf-tcpm-converters

Yuchung Cheng <ycheng@google.com> Mon, 03 June 2019 17:59 UTC

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In-Reply-To: <3d979013-16d3-689f-45cb-e5b007fe7f13@wizmail.org>
From: Yuchung Cheng <ycheng@google.com>
Date: Mon, 03 Jun 2019 10:58:43 -0700
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To: Jeremy Harris <jgh@wizmail.org>
Cc: "tcpm@ietf.org Extensions" <tcpm@ietf.org>
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Subject: Re: [tcpm] Progressing draft-ietf-tcpm-converters
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On Mon, Jun 3, 2019 at 7:37 AM Jeremy Harris <jgh@wizmail.org> wrote:
>
> On 29/05/2019 17:27, Praveen Balasubramanian wrote:
> > 2. Ability to RECEIVE data in SYN payload on server. This is only supported on all OS *after* 3WHS is completed. This is per RFC 793. The only exception is if TFO API is used, and then if cookie is validated the application will  receive early-data. There is no way to retrieve early data otherwise.
>
> There is a bit in the tcp_fastopen sysctl for Linux described so:
>
>     0x200: (server) accept data-in-SYN w/o any cookie option present.
>
> It doesn't say explicitly that the data is presented to the application
> (neither does the doc for the with-cookie server TFO control bit).
> Does anybody know whether it is?
I am not sure what you mean - what is "it" in your last question?

when this option is used (0x200), TFO will accept the data in SYN w/o
or w/ any cookie. Accept(2) will return in 3WHS. but note that SYN-ACK
is returned immediately upon receiving SYN-data in this mode. so this
mode will not support the latest tcpm-converter proposal where SYN-ack
is delayed upon (in-data) cookie verification and proxy 3WHS
completion. This change requires non-trivial implementation for a
listener handling millions of requests in Linux.

>
> --
> Cheers,
>   Jeremy
>
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