Re: [quicwg/base-drafts] missing description of what happens when receiving an ACK for an unsent packet (#2298)

Kazuho Oku <notifications@github.com> Sun, 06 January 2019 18:01 UTC

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Subject: Re: [quicwg/base-drafts] missing description of what happens when receiving an ACK for an unsent packet (#2298)
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> I'm not sure which error code to use for that though, none of those currently defined really matches this case, so you'd have to use INTERNAL_ERROR.

I think you are expected to use PROTOCOL_VIOLATION in such case. Quoting from editors' draft: _An endpoint detected an error with protocol compliance that was not covered by more specific error codes._

> A peer that receives an acknowledgement for a packet that it didn't send should be required to close the connection.

FWIW, I think that the requirement should be no stronger than "SHOULD if detected", to avoid endpoints memoizing the gaps for the previous 2<sup>31</sup> range. I assume that endpoints would typically just drop packets carrying a PN that is deemed too old.

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