commit 1cda024edf1501f23d639a40965602205ab300bb Author: Nick Mathewson <nickm@torproject.org> Date: Tue Sep 19 09:47:56 2017 -0400 clarify that RELAY_SENDME cells are empty --- tor-spec.txt | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/tor-spec.txt b/tor-spec.txt index 16dc74b..bb74678 100644 --- a/tor-spec.txt +++ b/tor-spec.txt @@ -1604,9 +1604,9 @@ see tor-design.pdf. if no 'circwindow' value is given, in each direction (cells that are not data cells do not affect the window). When an OR is willing to deliver more cells, it sends a - RELAY_SENDME cell towards the OP, with Stream ID zero. When an OR - receives a RELAY_SENDME cell with stream ID zero, it increments its - packaging window. + RELAY_SENDME cell towards the OP, with Stream ID zero and an empty + body. When an OR receives a RELAY_SENDME cell with stream ID zero, it + increments its packaging window. (The body SHOULD be ignored.) Each of these cells increments the corresponding window by 100. @@ -1631,6 +1631,8 @@ see tor-design.pdf. cells when both a) the window is <= 450, and b) there are less than ten cell payloads remaining to be flushed at that edge. + Stream-level RELAY_SENDME cells are distinguished by having nonzero + StreamID. They are still empty; the body still SHOULD be ignored. 8. Handling resource exhaustion