Commit 248fbc36 authored by Mike Perry's avatar Mike Perry
Browse files

Update pathbias parameters to match Proposal 209.

Needs manpage update and testing still..
parent 954f263e
......@@ -985,7 +985,7 @@ circuit_init_cpath_crypto(crypt_path_t *cpath, const char *key_data,
static int
pathbias_get_min_circs(const or_options_t *options)
{
#define DFLT_PATH_BIAS_MIN_CIRC 20
#define DFLT_PATH_BIAS_MIN_CIRC 150
if (options->PathBiasCircThreshold >= 5)
return options->PathBiasCircThreshold;
else
......@@ -997,7 +997,7 @@ pathbias_get_min_circs(const or_options_t *options)
static double
pathbias_get_notice_rate(const or_options_t *options)
{
#define DFLT_PATH_BIAS_NOTICE_PCT 40
#define DFLT_PATH_BIAS_NOTICE_PCT 70
if (options->PathBiasNoticeRate >= 0.0)
return options->PathBiasNoticeRate;
else
......@@ -1007,22 +1007,45 @@ pathbias_get_notice_rate(const or_options_t *options)
/* XXXX024 I'd like to have this be static again, but entrynodes.c needs it. */
double
pathbias_get_disable_rate(const or_options_t *options)
pathbias_get_warn_rate(const or_options_t *options)
{
// XXX: This needs tuning based on use + experimentation before we set it
#define DFLT_PATH_BIAS_DISABLE_PCT 0
if (options->PathBiasDisableRate >= 0.0)
return options->PathBiasDisableRate;
#define DFLT_PATH_BIAS_WARN_PCT 50
if (options->PathBiasWarnRate >= 0.0)
return options->PathBiasWarnRate;
else
return networkstatus_get_param(NULL, "pb_disablepct",
DFLT_PATH_BIAS_DISABLE_PCT, 0, 100)/100.0;
return networkstatus_get_param(NULL, "pb_warnpct",
DFLT_PATH_BIAS_WARN_PCT, 0, 100)/100.0;
}
/* XXXX024 I'd like to have this be static again, but entrynodes.c needs it. */
double
pathbias_get_crit_rate(const or_options_t *options)
{
#define DFLT_PATH_BIAS_CRIT_PCT 30
if (options->PathBiasCritRate >= 0.0)
return options->PathBiasCritRate;
else
return networkstatus_get_param(NULL, "pb_critpct",
DFLT_PATH_BIAS_CRIT_PCT, 0, 100)/100.0;
}
/* XXXX024 I'd like to have this be static again, but entrynodes.c needs it. */
int
pathbias_get_dropguards(const or_options_t *options)
{
#define DFLT_PATH_BIAS_DROP_GUARDS 0
if (options->PathBiasDropGuards >= 0)
return options->PathBiasDropGuards;
else
return networkstatus_get_param(NULL, "pb_dropguards",
DFLT_PATH_BIAS_DROP_GUARDS, 0, 100)/100.0;
}
static int
pathbias_get_scale_threshold(const or_options_t *options)
{
#define DFLT_PATH_BIAS_SCALE_THRESHOLD 200
if (options->PathBiasScaleThreshold >= 2)
#define DFLT_PATH_BIAS_SCALE_THRESHOLD 300
if (options->PathBiasScaleThreshold >= 10)
return options->PathBiasScaleThreshold;
else
return networkstatus_get_param(NULL, "pb_scalecircs",
......@@ -1041,6 +1064,18 @@ pathbias_get_scale_factor(const or_options_t *options)
DFLT_PATH_BIAS_SCALE_FACTOR, 1, INT32_MAX);
}
static int
pathbias_get_mult_factor(const or_options_t *options)
{
#define DFLT_PATH_BIAS_MULT_FACTOR 1
if (options->PathBiasMultFactor >= 1)
return options->PathBiasMultFactor;
else
return networkstatus_get_param(NULL, "pb_multfactor",
DFLT_PATH_BIAS_MULT_FACTOR, 1,
pathbias_get_scale_factor(options)-1);
}
static const char *
pathbias_state_to_string(path_state_t state)
{
......@@ -1373,7 +1408,7 @@ entry_guard_inc_first_hop_count(entry_guard_t *guard)
* rate and disable the feature entirely. If refactoring, don't
* change to <= */
if (guard->circuit_successes/((double)guard->first_hops)
< pathbias_get_disable_rate(options)) {
< pathbias_get_crit_rate(options)) {
/* This message is currently disabled by default. */
log_warn(LD_PROTOCOL,
......@@ -1383,8 +1418,10 @@ entry_guard_inc_first_hop_count(entry_guard_t *guard)
guard->circuit_successes, guard->first_hops, guard->nickname,
hex_str(guard->identity, DIGEST_LEN));
guard->path_bias_disabled = 1;
guard->bad_since = approx_time();
if (pathbias_get_dropguards(options)) {
guard->path_bias_disabled = 1;
guard->bad_since = approx_time();
}
return -1;
} else if (guard->circuit_successes/((double)guard->first_hops)
< pathbias_get_notice_rate(options)
......@@ -1400,15 +1437,19 @@ entry_guard_inc_first_hop_count(entry_guard_t *guard)
/* If we get a ton of circuits, just scale everything down */
if (guard->first_hops > (unsigned)pathbias_get_scale_threshold(options)) {
const int scale_factor = pathbias_get_scale_factor(options);
const int mult_factor = pathbias_get_mult_factor(options);
/* For now, only scale if there will be no rounding error...
* XXX024: We want to switch to a real moving average for 0.2.4. */
if ((guard->first_hops % scale_factor) == 0 &&
(guard->circuit_successes % scale_factor) == 0) {
if (((mult_factor*guard->first_hops) % scale_factor) == 0 &&
((mult_factor*guard->circuit_successes) % scale_factor) == 0) {
log_info(LD_PROTOCOL,
"Scaling pathbias counts to (%u/%u)/%d for guard %s=%s",
guard->circuit_successes, guard->first_hops,
"Scaling pathbias counts to (%u/%u)*(%d/%d) for guard %s=%s",
guard->circuit_successes, guard->first_hops, mult_factor,
scale_factor, guard->nickname, hex_str(guard->identity,
DIGEST_LEN));
guard->first_hops *= mult_factor;
guard->circuit_successes *= mult_factor;
guard->first_hops /= scale_factor;
guard->circuit_successes /= scale_factor;
}
......
......@@ -53,7 +53,8 @@ const char *build_state_get_exit_nickname(cpath_build_state_t *state);
const node_t *choose_good_entry_server(uint8_t purpose,
cpath_build_state_t *state);
double pathbias_get_disable_rate(const or_options_t *options);
double pathbias_get_crit_rate(const or_options_t *options);
int pathbias_get_dropguards(const or_options_t *options);
#endif
......@@ -316,9 +316,12 @@ static config_var_t option_vars_[] = {
V(PathBiasCircThreshold, INT, "-1"),
V(PathBiasNoticeRate, DOUBLE, "-1"),
V(PathBiasDisableRate, DOUBLE, "-1"),
V(PathBiasWarnRate, DOUBLE, "-1"),
V(PathBiasCritRate, DOUBLE, "-1"),
V(PathBiasScaleThreshold, INT, "-1"),
V(PathBiasScaleFactor, INT, "-1"),
V(PathBiasMultFactor, INT, "-1"),
V(PathBiasDropGuards, BOOL, "0"),
OBSOLETE("PathlenCoinWeight"),
V(PerConnBWBurst, MEMUNIT, "0"),
......
......@@ -1048,8 +1048,9 @@ entry_guards_parse_state(or_state_t *state, int set, char **msg)
/* Note: We rely on the < comparison here to allow us to set a 0
* rate and disable the feature entirely. If refactoring, don't
* change to <= */
if (node->circuit_successes/((double)node->first_hops)
< pathbias_get_disable_rate(options)) {
if ((node->circuit_successes/((double)node->first_hops)
< pathbias_get_crit_rate(options)) &&
pathbias_get_dropguards(options)) {
node->path_bias_disabled = 1;
log_info(LD_GENERAL,
"Path bias is too high (%u/%u); disabling node %s",
......
......@@ -3784,9 +3784,12 @@ typedef struct {
*/
int PathBiasCircThreshold;
double PathBiasNoticeRate;
double PathBiasDisableRate;
double PathBiasWarnRate;
double PathBiasCritRate;
int PathBiasDropGuards;
int PathBiasScaleThreshold;
int PathBiasScaleFactor;
int PathBiasMultFactor;
/** @} */
int IPv6Exit; /**< Do we support exiting to IPv6 addresses? */
......
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