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Re: [rtcweb] Data channel: Handling of packets on unknown channels

Harald Alvestrand <harald@alvestrand.no> Thu, 28 June 2018 14:22 UTC

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To: Michael Tuexen <michael.tuexen@lurchi.franken.de>
Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
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From: Harald Alvestrand <harald@alvestrand.no>
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Date: Thu, 28 Jun 2018 16:22:08 +0200
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Subject: Re: [rtcweb] Data channel: Handling of packets on unknown channels
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Den 28. juni 2018 14:51, skrev Michael Tuexen:
>> On 28. Jun 2018, at 13:30, Harald Alvestrand <harald@alvestrand.no> wrote:
>>
>> In considering the datachannel API, we encountered one interesting race
>> condition:
>>
>> A: <configure for datachannel>
>>
>> A: CreateOffer(), SetLocalDescription(), send SDP
>>
>> B: SetRemoteDescription, CreateAnswer, SetLocalDescription, send SDP
>>
>> B: Configure an externally defined data channel, with #3249
>>
>> B: Send a message on #3249
>>
>> A: SetRemoteDescription
>>
>> A: Wait a while (THE PAUSE)
>>
>> A: Configure #3249
>>
>> Now, if a message comes in to A on #3249 during THE PAUSE, what is the
>> implementation to do?
> Isn't that some kind or error condition?
> 
> If that it true, one could apply:
> 
>    If a message with an unsupported PPID is received or some error
>    condition related to the received message is detected by the receiver
>    (for example, illegal ordering), the receiver SHOULD close the
>    corresponding data channel.  This implies in particular that
>    extensions using additional PPIDs can't be used without prior
>    negotiation.


The receiver can't close the datachannel if the datachannel doesn't
exist yet, so this doesn't work for that case.

> 
>> I studied draft-ietf-rtcweb-data-channel-13 for at least 3 minutes
>> before concluding that it doesn't say.
>>
>> What I'd PREFER it to say is "these messages will be dropped on the
>> floor. Tough luck."
>>
>> I would prefer it to say so explicitly.
>>
>> Can we do this?
> Not sure about the procedural thing... That ID is stuck in the RFC editor queue
> for a long time...
> 
> Best regards
> Michael
>>
>> -- 
>> Surveillance is pervasive. Go Dark.
>>
>> _______________________________________________
>> rtcweb mailing list
>> rtcweb@ietf.org
>> https://www.ietf.org/mailman/listinfo/rtcweb
>

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