Re: [quicwg/base-drafts] Split PTO calculation into a dedicated method (#3681)

Marten Seemann <notifications@github.com> Wed, 27 May 2020 05:58 UTC

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Date: Tue, 26 May 2020 22:58:22 -0700
From: Marten Seemann <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Split PTO calculation into a dedicated method (#3681)
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@marten-seemann requested changes on this pull request.



>        space = pn_space
   return time, space
 
+GetPtoTimeAndSpace():
+  duration = smoothed_rtt +
+      max(4 * rttvar, kGranularity) * (2 ^ pto_count)

I believe you're missing a pair of brackets here.

>        space = pn_space
   return time, space
 
+GetPtoTimeAndSpace():
+  duration = smoothed_rtt +
+      max(4 * rttvar, kGranularity) * (2 ^ pto_count)
+  # Arm PTO from now when there are no inflight packets
+  if (no in-flight packets):
+    return (now() + duration), Initial

This breaks the following case: As a client, I need to send a Handshake packet to unblock the server's amplification limit, if the Initial packet number space was already dropped.

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