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author | David Goulet <dgoulet@torproject.org> | 2024-04-16 15:24:39 +0000 |
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committer | David Goulet <dgoulet@torproject.org> | 2024-04-16 15:24:39 +0000 |
commit | c0ea56f5095359b0f6af94549250cc129a0d94c3 (patch) | |
tree | 42cb7bcf9c278aafd824211a0691dc7fa85121f6 /proposals | |
parent | db46703c96a3375d83b2077c8c58579077bb8458 (diff) | |
parent | 7b6d90cb37f47878d5d4dbfc1c807d50b2736e1c (diff) | |
download | torspec-main.tar.gz torspec-main.zip |
prop340: clarify SENDME window accounting
See merge request tpo/core/torspec!265
Diffstat (limited to 'proposals')
-rw-r--r-- | proposals/340-packed-and-fragmented.md | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/proposals/340-packed-and-fragmented.md b/proposals/340-packed-and-fragmented.md index 8586349..cd98cfd 100644 --- a/proposals/340-packed-and-fragmented.md +++ b/proposals/340-packed-and-fragmented.md @@ -301,6 +301,32 @@ Any increase in maximum length for any other message type requires a new EXTEND2 messages to be 2000 bytes long, we need to add a new proposal saying so, and reserving a new subprotocol version.) +### `SENDME` window accounting + +`SENDME` windows count relay *cells* rather than relay *messages*. + +A cell counts towards the circuit's `SENDME` window if it contains any part of +any message that would normally count towards `SENDME` windows (currently only +`DATA`). + +A cell counts towards the `SENDME` window of every stream that it contains +part of a message for, whose command counts towards `SENDME` windows. + +Examples: + +* A cell containing a `SENDME` message and a `RESOLVE` message currently + wouldn't count towards any windows, since neither of those commands currently + counts towards windows. +* A cell containing a `SENDME` message and a `DATA` message would count towards + the circuit window and the `DATA` message's stream's window. +* A cell containing two `DATA` messages, for different streams, would count + towards the circuit-level window and both stream-level windows. +* A cell containing two `DATA` messages for the *same* stream counts + *once* towards the circuit-level and stream-level windows. +* If `DATAGRAM` messages (proposal 339) are implemented, and count towards + windows, then every cell containing a fragment of a `DATAGRAM` message counts + towards windows. + # Appendix: Example cells Here is an example of the simplest case: one message, sent in one relay cell: |