Add OVERHEAD and DELIVERED fields to CIRC_BW events
I want to have information about how much data is actually for applications, so that external controllers can check for circuit side channel attacks.
To do this, I want to add two fields to CIRC_BW events: a PACKAGED field that reports the sum of all rh.length values for all relay cells, and a DELIVERED field that reports the sum of all rh.length for valid RELAY_DATA cells.
That way, controllers can check for large differences between PACKAGED and DELIVERED, to see if lots of data is being sent on a circuit that is getting silently dropped. They can also check for differences between the raw CIRC_BW value and DELIVERED, to see if an adversary is underfilling cells (though this may be far more prone to false positives).
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information