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Add a tristate to guard against unexpected circ purpose transitions

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This commit is contained in:
Mike Perry 2013-01-30 17:46:25 -04:00 committed by Nick Mathewson
parent 173ed05d2f
commit 6828a19670
2 changed files with 54 additions and 0 deletions
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42
src/or/circuitbuild.c
View File

@ -1352,6 +1352,24 @@ pathbias_should_count(origin_circuit_t *circ)
circ->base_.purpose == CIRCUIT_PURPOSE_S_REND_JOINED ||
(circ->base_.purpose >= CIRCUIT_PURPOSE_C_INTRODUCING &&
circ->base_.purpose <= CIRCUIT_PURPOSE_C_INTRODUCE_ACKED)) {
/* Check to see if the shouldcount result has changed due to a
* unexpected purpose change that would affect our results.
*
* The reason we check the path state too here is because for the
* cannibalized versions of these purposes, we count them as successful
* before their purpose change.
*/
if (circ->pathbias_shouldcount == PATHBIAS_SHOULDCOUNT_COUNTED
&& circ->path_state != PATH_STATE_ALREADY_COUNTED) {
log_info(LD_BUG,
"Circuit %d is now being ignored despite being counted "
"in the past. Purpose is %s, path state is %s",
circ->global_identifier,
circuit_purpose_to_string(circ->base_.purpose),
pathbias_state_to_string(circ->path_state));
}
circ->pathbias_shouldcount = PATHBIAS_SHOULDCOUNT_IGNORED;
return 0;
}
@ -1374,9 +1392,33 @@ pathbias_should_count(origin_circuit_t *circ)
}
tor_fragile_assert();
}
/* Check to see if the shouldcount result has changed due to a
* unexpected change that would affect our results */
if (circ->pathbias_shouldcount == PATHBIAS_SHOULDCOUNT_COUNTED) {
log_info(LD_BUG,
"One-hop circuit %d is now being ignored despite being counted "
"in the past. Purpose is %s, path state is %s",
circ->global_identifier,
circuit_purpose_to_string(circ->base_.purpose),
pathbias_state_to_string(circ->path_state));
}
circ->pathbias_shouldcount = PATHBIAS_SHOULDCOUNT_IGNORED;
return 0;
}
/* Check to see if the shouldcount result has changed due to a
* unexpected purpose change that would affect our results */
if (circ->pathbias_shouldcount == PATHBIAS_SHOULDCOUNT_IGNORED) {
log_info(LD_BUG,
"Circuit %d is now being counted despite being ignored "
"in the past. Purpose is %s, path state is %s",
circ->global_identifier,
circuit_purpose_to_string(circ->base_.purpose),
pathbias_state_to_string(circ->path_state));
}
circ->pathbias_shouldcount = PATHBIAS_SHOULDCOUNT_COUNTED;
return 1;
}

12
src/or/or.h
View File

@ -2920,6 +2920,18 @@ typedef struct origin_circuit_t {
*/
ENUM_BF(path_state_t) path_state : 3;
/**
* Tristate variable to guard against pathbias miscounting
* due to circuit purpose transitions changing the decision
* of pathbias_should_count(). This variable is informational
* only. The current results of pathbias_should_count() are
* the official decision for pathbias accounting.
*/
uint8_t pathbias_shouldcount;
#define PATHBIAS_SHOULDCOUNT_UNDECIDED 0
#define PATHBIAS_SHOULDCOUNT_IGNORED 1
#define PATHBIAS_SHOULDCOUNT_COUNTED 2
/** For path probing. Store the temporary probe stream ID
* for response comparison */
streamid_t pathbias_probe_id;