Re: [tcpm] Progressing draft-ietf-tcpm-converters
Jeremy Harris <jgh@wizmail.org> Mon, 03 June 2019 18:09 UTC
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From: Jeremy Harris <jgh@wizmail.org>
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Date: Mon, 03 Jun 2019 19:09:18 +0100
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Subject: Re: [tcpm] Progressing draft-ietf-tcpm-converters
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On 03/06/2019 18:58, Yuchung Cheng wrote: > 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? Whether the data, that arrived on the SYN, is available to the application (before, the item I forgot to specify, the ACK for the SYN,ACK arrives at the server). > 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. That's a separate point of interest, as is whether it will ever be feasible to carry data on the SYN,ACK (either for cookieless or cookieful mode). -- Cheers, Jeremy
- [tcpm] Progressing draft-ietf-tcpm-converters Olivier Bonaventure
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Yuchung Cheng
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Olivier Bonaventure
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Yuchung Cheng
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Yuchung Cheng
- Re: [tcpm] Progressing draft-ietf-tcpm-converters mohamed.boucadair
- Re: [tcpm] Progressing draft-ietf-tcpm-converters mohamed.boucadair
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Praveen Balasubramanian
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Yuchung Cheng
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Joe Touch
- Re: [tcpm] Progressing draft-ietf-tcpm-converters mohamed.boucadair
- Re: [tcpm] Progressing draft-ietf-tcpm-converters mohamed.boucadair
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Olivier Bonaventure
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Praveen Balasubramanian
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Yuchung Cheng
- Re: [tcpm] Progressing draft-ietf-tcpm-converters mohamed.boucadair
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Jeremy Harris
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Yuchung Cheng
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Yuchung Cheng
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Jeremy Harris
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Yuchung Cheng
- Re: [tcpm] Progressing draft-ietf-tcpm-converters mohamed.boucadair
- Re: [tcpm] Progressing draft-ietf-tcpm-converters Yuchung Cheng
- Re: [tcpm] Progressing draft-ietf-tcpm-converters mohamed.boucadair