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Remove start_usec/range_usec and make equivalent fields for distributions.
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@ -399,17 +399,17 @@ circpad_choose_state_length(circpad_machine_state_t *mi)
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*/
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static circpad_delay_t
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circpad_distribution_sample_iat_delay(const circpad_state_t *state,
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circpad_delay_t start_usec)
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circpad_delay_t min_delay)
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{
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double val = circpad_distribution_sample(state->iat_dist);
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/* These comparisons are safe, because the output is in the range
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* [0, 2**32), and double has a precision of 53 bits. */
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val = MAX(0, val);
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val = MIN(val, state->range_usec);
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val = MIN(val, state->dist_max_usec);
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/* This addition is exact: val is at most 2**32-1, start_usec
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/* This addition is exact: val is at most 2**32-1, min_delay
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* is at most 2**32-1, and doubles have a precision of 53 bits. */
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val += start_usec;
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val += min_delay;
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/* Clamp the distribution at infinite delay val */
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return (circpad_delay_t)MIN(tor_llround(val), CIRCPAD_DELAY_INFINITE);
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@ -429,7 +429,6 @@ circpad_machine_sample_delay(circpad_machine_state_t *mi)
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const circpad_hist_token_t *histogram = NULL;
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circpad_hist_index_t curr_bin = 0;
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circpad_delay_t bin_start, bin_end;
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circpad_delay_t start_usec;
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/* These three must all be larger than circpad_hist_token_t, because
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* we sum several circpad_hist_token_t values across the histogram */
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uint64_t curr_weight = 0;
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@ -438,14 +437,11 @@ circpad_machine_sample_delay(circpad_machine_state_t *mi)
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tor_assert(state);
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if (state->use_rtt_estimate)
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start_usec = mi->rtt_estimate_usec+state->start_usec;
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else
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start_usec = state->start_usec;
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if (state->iat_dist.type != CIRCPAD_DIST_NONE) {
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/* Sample from a fixed IAT distribution and return */
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return circpad_distribution_sample_iat_delay(state, start_usec);
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circpad_delay_t min_iat_delay = state->use_rtt_estimate ?
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mi->rtt_estimate_usec + state->dist_min_usec : state->dist_min_usec;
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return circpad_distribution_sample_iat_delay(state, min_iat_delay);
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} else if (state->token_removal != CIRCPAD_TOKEN_REMOVAL_NONE) {
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/* We have a mutable histogram. Do basic sanity check and apply: */
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if (BUG(!mi->histogram) ||
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@ -297,24 +297,6 @@ typedef struct circpad_state_t {
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* refilling the histogram. */
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uint32_t histogram_total_tokens;
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/** Minimum padding delay of this state in microseconds.
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*
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* If histograms are used, this is the left (and right) bound of the first
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* bin (since it has zero width).
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*
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* If a delay probability distribution is used, this represents the minimum
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* delay we can sample from the distribution.
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*/
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circpad_delay_t start_usec;
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/** If histograms are used, this is the width of the whole histogram in
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* microseconds, and it's used to calculate individual bin width.
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*
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* If a delay probability distribution is used, this is used as the max
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* delay we can sample from the distribution.
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*/
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circpad_delay_t range_usec;
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/**
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* Represents a delay probability distribution (aka IAT distribution). It's a
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* parametrized way of encoding inter-packet delay information in
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@ -327,6 +309,13 @@ typedef struct circpad_state_t {
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* results of sampling from this distribution (range_sec is used as a max).
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*/
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circpad_distribution_t iat_dist;
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/* If a delay probability distribution is used, this represents the minimum
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* delay we can sample from the distribution. */
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circpad_delay_t dist_min_usec;
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/* If a delay probability distribution is used, this is used as the max
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* delay we can sample from the distribution.
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*/
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circpad_delay_t dist_max_usec;
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/**
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* The length dist is a parameterized way of encoding how long this
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@ -2067,48 +2067,48 @@ helper_circpad_circ_distribution_machine_setup(int min, int max)
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zero_st->iat_dist.type = CIRCPAD_DIST_UNIFORM;
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zero_st->iat_dist.param1 = min;
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zero_st->iat_dist.param2 = max;
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zero_st->start_usec = min;
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zero_st->range_usec = max;
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zero_st->dist_min_usec = min;
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zero_st->dist_max_usec = max;
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circpad_state_t *first_st = &circ_client_machine.states[1];
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first_st->next_state[CIRCPAD_EVENT_NONPADDING_RECV] = 2;
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first_st->iat_dist.type = CIRCPAD_DIST_LOGISTIC;
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first_st->iat_dist.param1 = min;
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first_st->iat_dist.param2 = max;
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first_st->start_usec = min;
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first_st->range_usec = max;
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first_st->dist_min_usec = min;
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first_st->dist_max_usec = max;
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circpad_state_t *second_st = &circ_client_machine.states[2];
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second_st->next_state[CIRCPAD_EVENT_NONPADDING_RECV] = 3;
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second_st->iat_dist.type = CIRCPAD_DIST_LOG_LOGISTIC;
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second_st->iat_dist.param1 = min;
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second_st->iat_dist.param2 = max;
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second_st->start_usec = min;
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second_st->range_usec = max;
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second_st->dist_min_usec = min;
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second_st->dist_max_usec = max;
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circpad_state_t *third_st = &circ_client_machine.states[3];
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third_st->next_state[CIRCPAD_EVENT_NONPADDING_RECV] = 4;
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third_st->iat_dist.type = CIRCPAD_DIST_GEOMETRIC;
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third_st->iat_dist.param1 = min;
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third_st->iat_dist.param2 = max;
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third_st->start_usec = min;
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third_st->range_usec = max;
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third_st->dist_min_usec = min;
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third_st->dist_max_usec = max;
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circpad_state_t *fourth_st = &circ_client_machine.states[4];
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fourth_st->next_state[CIRCPAD_EVENT_NONPADDING_RECV] = 5;
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fourth_st->iat_dist.type = CIRCPAD_DIST_WEIBULL;
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fourth_st->iat_dist.param1 = min;
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fourth_st->iat_dist.param2 = max;
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fourth_st->start_usec = min;
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fourth_st->range_usec = max;
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fourth_st->dist_min_usec = min;
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fourth_st->dist_max_usec = max;
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circpad_state_t *fifth_st = &circ_client_machine.states[5];
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fifth_st->next_state[CIRCPAD_EVENT_NONPADDING_RECV] = 6;
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fifth_st->iat_dist.type = CIRCPAD_DIST_PARETO;
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fifth_st->iat_dist.param1 = min;
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fifth_st->iat_dist.param2 = max;
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fifth_st->start_usec = min;
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fifth_st->range_usec = max;
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fifth_st->dist_min_usec = min;
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fifth_st->dist_max_usec = max;
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}
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/** Simple test that the padding delays sampled from a uniform distribution
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