[tor-bugs] #26840 [Core Tor/Tor]: prop289: Modify SENDME cell to have a version and payload

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#26840: prop289: Modify SENDME cell to have a version and payload
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     Reporter:  dgoulet       |      Owner:  dgoulet
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  prop289, tor-spec
Actual Points:                |  Parent ID:  #26288
       Points:                |   Reviewer:
      Sponsor:                |
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 To implement prop289, we need the SENDME cell (empty payload right now) to
 have a version and payload for the bytes inserted into them.

 1) We should have a trunnel definition with a proper specification of the
 cell.

 2) Have the code interface to construct those new SENDME cells but don't
 put them on the wire just yet.

 For (2), we could put them on the wire right now but we should make sure
 tor will accept them (validating empty payload vs not looking at the
 payload at all).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26840>
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