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o Minor features:
- Alter the Path Bias log messages to be more descriptive in terms
of reporting timeouts and other statistics.
- Create three levels of Path Bias log messages, as opposed to just
two. These are configurable via consensus as well as via torrc
options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
The default values are 0.70, 0.50, and 0.30 respectively.
- Separate the log message levels from the decision to drop guards,
which also is available via torrc option PathBiasDropGuards.
PathBiasDropGuards defaults to 0 (off).
- Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
in combination with PathBiasExtremeRate.
- Increase the default values for PathBiasScaleThreshold and
PathBiasCircThreshold from 200 and 20 to 300 and 150, respectively.
- Add in circuit usage accounting to path bias. If we try to use a
built circuit but fail for any reason, it counts as path bias.
Certain classes of circuits where the adversary gets to pick your
destination node are exempt from this accounting. Usage accounting
can be specifically disabled via consensus parameter or torrc.
- Convert all internal path bias state to double-precision floating
point, to avoid roundoff error and other issues.
- Only record path bias information for circuits that have completed
*two* hops. Assuming end-to-end tagging is the attack vector, this
makes us more resilient to ambient circuit failure without any
detection capability loss.
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