[quicwg/base-drafts] Define requirements for handling packets (#724)

[Martin Thomson <[e-mail]>]

We never really said how to handle incoming packets.  This adds a section on
that.  This was originally motivated by #570, where the rules for what to
generate a Version Negotiation packet for were a little unclear.

Now though, this is a far more comprehensive description of what to do with
a packet that is received.

For #570, I've chosen to limit packet size.  If the packet is too small, then
this requires the server to drop the packet.  In response to the potential for
a future version of QUIC to define a smaller initial packet (@mikkelfj raised
this point), I've included advice on what might be done to avoid having packets
discarded.

I realize that we don't have a patch that sets the packet size to 1200.  I'm
going to write that one now.  This depends on that.

Closes #570.  

I would also like to do the same to #568, but that will be down to @mcmanus.  To the extent that we treat VN as special (see discussion on #693 regarding this), then that will be addressed by the change proposed there.
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/724

-- Commit Summary --

  * Define requirements for handling packets

-- File Changes --

    M draft-ietf-quic-transport.md (100)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/724.patch
https://github.com/quicwg/base-drafts/pull/724.diff

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