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

Jeremy Harris <jgh@wizmail.org> Mon, 03 June 2019 14:37 UTC

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From: Jeremy Harris <jgh@wizmail.org>
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Date: Mon, 3 Jun 2019 15:37:22 +0100
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Subject: Re: [tcpm] Progressing draft-ietf-tcpm-converters
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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?

-- 
Cheers,
  Jeremy