Re: Q and L loss bits: which is which?

[<[e-mail]>]

Yes, you're right again. Those bits are definitely to be sent in clear:
     |0|1|S|Q|L|E E E|
Of course, the whole header remains part of the AD so is integrity
protected. Hence Q&L are no more subject to middlebox tampering than
the rest.

On Tue, 2019-11-19 at 10:08 -0500, Dmitri Tikhonov wrote:
> On Tue, Nov 19, 2019 at 03:49:08PM +0100, alexandre.ferrieux@orange.c
> om wrote:
> > Thanks for your offer: experimentations are very welcome !
> > You're right we forgot to just define which is what, we'll fix the
> > draft shortly. We'll choose: 0x10 for Q and 0x08 for L.
> > This means the first byte layout becomes:
> >  |0|1|S|Q|L|K|P P|
> 
> Thank you!
> 
> I also assume that these two bits would now be outside of the header
> protection?  That is, the short header header protection mask [1] is
> now 0x7 instead of 0x1F?  This is not mentioned in your draft, but I
> don't see how an observer could get at those bits otherwise.
> 
>   - Dmitri.
> 
> 1. https://tools.ietf.org/html/draft-ietf-quic-tls-24#section-5.4.1

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