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Merge branch 'bug29085_rebase'

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This commit is contained in:
George Kadianakis 2019-05-15 15:13:08 +03:00
commit a7779df84c
5 changed files with 441 additions and 133 deletions
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4
changes/bug29085 Normal file
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@ -0,0 +1,4 @@
o Code simplification and refactoring (circuit padding):
- Avoid calling monotime_absolute_usec() in circuit padding machines
that do not use token removal or circuit RTT estimation. Fixes bug
29085; bugfix on 0.4.0.1-alpha.

1
scripts/maint/practracker/exceptions.txt
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@ -289,3 +289,4 @@ problem function-size /src/tools/tor-gencert.c:parse_commandline() 111
problem function-size /src/tools/tor-resolve.c:build_socks5_resolve_request() 104
problem function-size /src/tools/tor-resolve.c:do_resolve() 175
problem function-size /src/tools/tor-resolve.c:main() 112
problem function-size /src/core/or/circuitpadding.c:circpad_machine_schedule_padding() 107

261
src/core/or/circuitpadding.c
View File

@ -80,6 +80,9 @@ static void circpad_setup_machine_on_circ(circuit_t *on_circ,
const circpad_machine_spec_t *machine);
static double circpad_distribution_sample(circpad_distribution_t dist);
static inline void circpad_machine_update_state_length_for_nonpadding(
circpad_machine_runtime_t *mi);
/** Cached consensus params */
static uint8_t circpad_padding_disabled;
static uint8_t circpad_padding_reduced;
@ -250,7 +253,7 @@ circpad_histogram_bin_to_usec(const circpad_machine_runtime_t *mi,
/* The infinity bin has an upper bound of infinity, so make sure we return
* that if they ask for it. */
if (bin > CIRCPAD_INFINITY_BIN(mi)) {
if (bin > CIRCPAD_INFINITY_BIN(state)) {
return CIRCPAD_DELAY_INFINITE;
}
@ -327,6 +330,39 @@ circpad_histogram_usec_to_bin(const circpad_machine_runtime_t *mi,
return CIRCPAD_INFINITY_BIN(state)-1;
}
/**
* Return true if the machine supports token removal.
*
* Token removal is equivalent to having a mutable histogram in the
* circpad_machine_runtime_t mutable info. So while we're at it,
* let's assert that everything is consistent between the mutable
* runtime and the readonly machine spec.
*/
static inline int
circpad_is_token_removal_supported(circpad_machine_runtime_t *mi)
{
/* No runtime histogram == no token removal */
if (mi->histogram == NULL) {
/* Machines that don't want token removal are trying to avoid
* potentially expensive mallocs, extra memory accesses, and/or
* potentially expensive monotime calls. Let's minimize checks
* and keep this path fast. */
tor_assert_nonfatal(mi->histogram_len == 0);
return 0;
} else {
/* Machines that do want token removal are less sensitive to performance.
* Let's spend some time to check that our state is consistent and sane */
const circpad_state_t *state = circpad_machine_current_state(mi);
tor_assert_nonfatal(state->token_removal != CIRCPAD_TOKEN_REMOVAL_NONE);
tor_assert_nonfatal(state->histogram_len == mi->histogram_len);
tor_assert_nonfatal(mi->histogram_len != 0);
return 1;
}
tor_assert_nonfatal_unreached();
return 0;
}
/**
* This function frees any token bins allocated from a previous state
*
@ -438,13 +474,7 @@ circpad_machine_sample_delay(circpad_machine_runtime_t *mi)
mi->rtt_estimate_usec + state->dist_added_shift_usec :
state->dist_added_shift_usec;
return circpad_distribution_sample_iat_delay(state, iat_delay_shift);
} else if (state->token_removal != CIRCPAD_TOKEN_REMOVAL_NONE) {
/* We have a mutable histogram. Do basic sanity check and apply: */
if (BUG(!mi->histogram) ||
BUG(mi->histogram_len != state->histogram_len)) {
return CIRCPAD_DELAY_INFINITE;
}
} else if (circpad_is_token_removal_supported(mi)) {
histogram = mi->histogram;
for (circpad_hist_index_t b = 0; b < state->histogram_len; b++)
histogram_total_tokens += histogram[b];
@ -809,7 +839,7 @@ check_machine_token_supply(circpad_machine_runtime_t *mi)
*
* We also do not count infinity bin in histogram totals.
*/
if (mi->histogram_len && mi->histogram) {
if (circpad_is_token_removal_supported(mi)) {
for (circpad_hist_index_t b = 0; b < CIRCPAD_INFINITY_BIN(mi); b++)
histogram_total_tokens += mi->histogram[b];
@ -828,22 +858,55 @@ check_machine_token_supply(circpad_machine_runtime_t *mi)
}
/**
* Remove a token from the bin corresponding to the delta since
* last packet. If that bin is empty, choose a token based on
* the specified removal strategy in the state machine.
* Count that a padding packet was sent.
*
* This function also updates and checks rate limit and state
* limit counters.
*
* Returns 1 if we transition states, 0 otherwise.
* This updates our state length count, our machine rate limit counts,
* and if token removal is used, decrements the histogram.
*/
STATIC circpad_decision_t
circpad_machine_remove_token(circpad_machine_runtime_t *mi)
static inline void
circpad_machine_count_padding_sent(circpad_machine_runtime_t *mi)
{
const circpad_state_t *state = NULL;
circpad_time_t current_time;
circpad_delay_t target_bin_usec;
/* If we have a valid state length bound, consider it */
if (mi->state_length != CIRCPAD_STATE_LENGTH_INFINITE &&
!BUG(mi->state_length <= 0)) {
mi->state_length--;
}
/*
* Update non-padding counts for rate limiting: We scale at UINT16_MAX
* because we only use this for a percentile limit of 2 sig figs, and
* space is scare in the machineinfo struct.
*/
mi->padding_sent++;
if (mi->padding_sent == UINT16_MAX) {
mi->padding_sent /= 2;
mi->nonpadding_sent /= 2;
}
circpad_global_padding_sent++;
/* If we have a mutable histogram, reduce the token count from
* the chosen padding bin (this assumes we always send padding
* when we intended to). */
if (circpad_is_token_removal_supported(mi)) {
/* Check array bounds and token count before removing */
if (!BUG(mi->chosen_bin >= mi->histogram_len) &&
!BUG(mi->histogram[mi->chosen_bin] == 0)) {
mi->histogram[mi->chosen_bin]--;
}
}
}
/**
* Count a nonpadding packet as being sent.
*
* This function updates our overhead accounting variables, as well
* as decrements the state limit packet counter, if the latter was
* flagged as applying to non-padding as well.
*/
static inline void
circpad_machine_count_nonpadding_sent(circpad_machine_runtime_t *mi)
{
/* Update non-padding counts for rate limiting: We scale at UINT16_MAX
* because we only use this for a percentile limit of 2 sig figs, and
* space is scare in the machineinfo struct. */
@ -853,12 +916,67 @@ circpad_machine_remove_token(circpad_machine_runtime_t *mi)
mi->nonpadding_sent /= 2;
}
/* Update any state packet length limits that apply */
circpad_machine_update_state_length_for_nonpadding(mi);
/* Remove a token from the histogram, if applicable */
circpad_machine_remove_token(mi);
}
/**
* Decrement the state length counter for a non-padding packet.
*
* Only updates the state length if we're using that feature, we
* have a state, and the machine wants to count non-padding packets
* towards the state length.
*/
static inline void
circpad_machine_update_state_length_for_nonpadding(
circpad_machine_runtime_t *mi)
{
const circpad_state_t *state = NULL;
if (mi->state_length == CIRCPAD_STATE_LENGTH_INFINITE)
return;
state = circpad_machine_current_state(mi);
/* If we are not in a padding state (like start or end), we're done */
if (!state)
return;
/* If we're enforcing a state length on non-padding packets,
* decrement it */
if (state->length_includes_nonpadding &&
mi->state_length > 0) {
mi->state_length--;
}
}
/**
* When a non-padding packet arrives, remove a token from the bin
* corresponding to the delta since last sent packet. If that bin
* is empty, choose a token based on the specified removal strategy
* in the state machine.
*/
STATIC void
circpad_machine_remove_token(circpad_machine_runtime_t *mi)
{
const circpad_state_t *state = NULL;
circpad_time_t current_time;
circpad_delay_t target_bin_usec;
/* Dont remove any tokens if there was no padding scheduled */
if (!mi->padding_scheduled_at_usec) {
return CIRCPAD_STATE_UNCHANGED;
return;
}
state = circpad_machine_current_state(mi);
/* Don't remove any tokens if we're not doing token removal */
if (!state || state->token_removal == CIRCPAD_TOKEN_REMOVAL_NONE)
return;
current_time = monotime_absolute_usec();
/* If we have scheduled padding some time in the future, we want to see what
@ -877,20 +995,10 @@ circpad_machine_remove_token(circpad_machine_runtime_t *mi)
/* If we are not in a padding state (like start or end), we're done */
if (!state)
return CIRCPAD_STATE_UNCHANGED;
/* If we're enforcing a state length on non-padding packets,
* decrement it */
if (mi->state_length != CIRCPAD_STATE_LENGTH_INFINITE &&
state->length_includes_nonpadding &&
mi->state_length > 0) {
mi->state_length--;
}
return;
/* Perform the specified token removal strategy */
switch (state->token_removal) {
case CIRCPAD_TOKEN_REMOVAL_NONE:
break;
case CIRCPAD_TOKEN_REMOVAL_CLOSEST_USEC:
circpad_machine_remove_closest_token(mi, target_bin_usec, 1);
break;
@ -906,10 +1014,13 @@ circpad_machine_remove_token(circpad_machine_runtime_t *mi)
case CIRCPAD_TOKEN_REMOVAL_EXACT:
circpad_machine_remove_exact(mi, target_bin_usec);
break;
case CIRCPAD_TOKEN_REMOVAL_NONE:
default:
tor_assert_nonfatal_unreached();
log_warn(LD_BUG, "Circpad: Unknown token removal strategy %d",
state->token_removal);
break;
}
/* Check our token and state length limits */
return check_machine_token_supply(mi);
}
/**
@ -979,34 +1090,7 @@ circpad_send_padding_cell_for_callback(circpad_machine_runtime_t *mi)
return CIRCPAD_STATE_CHANGED;
}
/* If it's a histogram, reduce the token count */
if (mi->histogram && mi->histogram_len) {
/* Basic sanity check on the histogram before removing anything */
if (BUG(mi->chosen_bin >= mi->histogram_len) ||
BUG(mi->histogram[mi->chosen_bin] == 0)) {
return CIRCPAD_STATE_CHANGED;
}
mi->histogram[mi->chosen_bin]--;
}
/* If we have a valid state length bound, consider it */
if (mi->state_length != CIRCPAD_STATE_LENGTH_INFINITE &&
!BUG(mi->state_length <= 0)) {
mi->state_length--;
}
/*
* Update non-padding counts for rate limiting: We scale at UINT16_MAX
* because we only use this for a percentile limit of 2 sig figs, and
* space is scare in the machineinfo struct.
*/
mi->padding_sent++;
if (mi->padding_sent == UINT16_MAX) {
mi->padding_sent /= 2;
mi->nonpadding_sent /= 2;
}
circpad_global_padding_sent++;
circpad_machine_count_padding_sent(mi);
if (CIRCUIT_IS_ORIGIN(mi->on_circ)) {
circpad_send_command_to_hop(TO_ORIGIN_CIRCUIT(mi->on_circ),
@ -1240,7 +1324,17 @@ circpad_machine_schedule_padding,(circpad_machine_runtime_t *mi))
/* in_usec = in microseconds */
in_usec = circpad_machine_sample_delay(mi);
/* If we're using token removal, we need to know when the padding
* was scheduled at, so we can remove the appropriate token if
* a non-padding cell is sent before the padding timer expires.
*
* However, since monotime is unpredictably expensive, let's avoid
* using it for machines that don't need token removal. */
if (circpad_is_token_removal_supported(mi)) {
mi->padding_scheduled_at_usec = monotime_absolute_usec();
} else {
mi->padding_scheduled_at_usec = 1;
}
log_fn(LOG_INFO,LD_CIRC,"\tPadding in %u usec", in_usec);
// Don't schedule if we have infinite delay.
@ -1454,9 +1548,25 @@ circpad_estimate_circ_rtt_on_received(circuit_t *circ,
circ->n_chan ? circ->n_chan->global_identifier : 0,
circ->n_circ_id, mi->rtt_estimate_usec);
mi->stop_rtt_update = 1;
if (!mi->rtt_estimate_usec) {
static ratelim_t rtt_lim = RATELIM_INIT(600);
log_fn_ratelim(&rtt_lim,LOG_NOTICE,LD_BUG,
"Circuit got two cells back to back before estimating RTT.");
}
}
} else {
const circpad_state_t *state = circpad_machine_current_state(mi);
/* Since monotime is unpredictably expensive, only update this field
* if rtt estimates are needed. Otherwise, stop the rtt update. */
if (state->use_rtt_estimate) {
mi->last_received_time_usec = monotime_absolute_usec();
} else {
/* Let's fast-path future decisions not to update rtt if the
* feature is not in use. */
mi->stop_rtt_update = 1;
}
}
}
@ -1516,8 +1626,9 @@ circpad_estimate_circ_rtt_on_send(circuit_t *circ,
mi->stop_rtt_update = 1;
if (!mi->rtt_estimate_usec) {
log_fn(LOG_NOTICE, LD_CIRC,
"Got two cells back to back on a circuit before estimating RTT.");
static ratelim_t rtt_lim = RATELIM_INIT(600);
log_fn_ratelim(&rtt_lim,LOG_NOTICE,LD_BUG,
"Circuit sent two cells back to back before estimating RTT.");
}
}
}
@ -1541,9 +1652,13 @@ circpad_cell_event_nonpadding_sent(circuit_t *on_circ)
/* First, update any RTT estimate */
circpad_estimate_circ_rtt_on_send(on_circ, on_circ->padding_info[i]);
/* Remove a token: this is the idea of adaptive padding, since we have an
* ideal distribution that we want our distribution to look like. */
if (!circpad_machine_remove_token(on_circ->padding_info[i])) {
/* Then, do accounting */
circpad_machine_count_nonpadding_sent(on_circ->padding_info[i]);
/* Check to see if we've run out of tokens for this state already,
* and if not, check for other state transitions */
if (check_machine_token_supply(on_circ->padding_info[i])
== CIRCPAD_STATE_UNCHANGED) {
/* If removing a token did not cause a transition, check if
* non-padding sent event should */
circpad_machine_spec_transition(on_circ->padding_info[i],
@ -1584,8 +1699,16 @@ void
circpad_cell_event_padding_sent(circuit_t *on_circ)
{
FOR_EACH_ACTIVE_CIRCUIT_MACHINE_BEGIN(i, on_circ) {
/* Check to see if we've run out of tokens for this state already,
* and if not, check for other state transitions */
if (check_machine_token_supply(on_circ->padding_info[i])
== CIRCPAD_STATE_UNCHANGED) {
/* If removing a token did not cause a transition, check if
* non-padding sent event should */
circpad_machine_spec_transition(on_circ->padding_info[i],
CIRCPAD_EVENT_PADDING_SENT);
}
} FOR_EACH_ACTIVE_CIRCUIT_MACHINE_END;
}

5
src/core/or/circuitpadding.h
View File

@ -712,9 +712,6 @@ circpad_machine_sample_delay(circpad_machine_runtime_t *mi);
STATIC bool
circpad_machine_reached_padding_limit(circpad_machine_runtime_t *mi);
STATIC
circpad_decision_t circpad_machine_remove_token(circpad_machine_runtime_t *mi);
STATIC circpad_delay_t
circpad_histogram_bin_to_usec(const circpad_machine_runtime_t *mi,
circpad_hist_index_t bin);
@ -722,6 +719,8 @@ circpad_histogram_bin_to_usec(const circpad_machine_runtime_t *mi,
STATIC const circpad_state_t *
circpad_machine_current_state(const circpad_machine_runtime_t *mi);
STATIC void circpad_machine_remove_token(circpad_machine_runtime_t *mi);
STATIC circpad_hist_index_t circpad_histogram_usec_to_bin(
const circpad_machine_runtime_t *mi,
circpad_delay_t us);

295
src/test/test_circuitpadding.c
View File

@ -55,6 +55,7 @@ void test_circuitpadding_conditions(void *arg);
void test_circuitpadding_serialize(void *arg);
void test_circuitpadding_rtt(void *arg);
void test_circuitpadding_tokens(void *arg);
void test_circuitpadding_state_length(void *arg);
static void
simulate_single_hop_extend(circuit_t *client, circuit_t *mid_relay,
@ -329,12 +330,12 @@ test_circuitpadding_rtt(void *arg)
relay_side->padding_info[0] = circpad_circuit_machineinfo_new(client_side,0);
/* Test 1: Test measuring RTT */
circpad_cell_event_nonpadding_received((circuit_t*)relay_side);
circpad_cell_event_nonpadding_received(relay_side);
tt_u64_op(relay_side->padding_info[0]->last_received_time_usec, OP_NE, 0);
timers_advance_and_run(20);
circpad_cell_event_nonpadding_sent((circuit_t*)relay_side);
circpad_cell_event_nonpadding_sent(relay_side);
tt_u64_op(relay_side->padding_info[0]->last_received_time_usec, OP_EQ, 0);
tt_int_op(relay_side->padding_info[0]->rtt_estimate_usec, OP_GE, 19000);
@ -345,12 +346,12 @@ test_circuitpadding_rtt(void *arg)
circpad_machine_current_state(
relay_side->padding_info[0])->histogram_edges[0]);
circpad_cell_event_nonpadding_received((circuit_t*)relay_side);
circpad_cell_event_nonpadding_received((circuit_t*)relay_side);
circpad_cell_event_nonpadding_received(relay_side);
circpad_cell_event_nonpadding_received(relay_side);
tt_u64_op(relay_side->padding_info[0]->last_received_time_usec, OP_NE, 0);
timers_advance_and_run(20);
circpad_cell_event_nonpadding_sent((circuit_t*)relay_side);
circpad_cell_event_nonpadding_sent((circuit_t*)relay_side);
circpad_cell_event_nonpadding_sent(relay_side);
circpad_cell_event_nonpadding_sent(relay_side);
tt_u64_op(relay_side->padding_info[0]->last_received_time_usec, OP_EQ, 0);
tt_int_op(relay_side->padding_info[0]->rtt_estimate_usec, OP_GE, 20000);
@ -365,9 +366,9 @@ test_circuitpadding_rtt(void *arg)
tt_int_op(relay_side->padding_info[0]->stop_rtt_update, OP_EQ, 1);
rtt_estimate = relay_side->padding_info[0]->rtt_estimate_usec;
circpad_cell_event_nonpadding_received((circuit_t*)relay_side);
circpad_cell_event_nonpadding_received(relay_side);
timers_advance_and_run(4);
circpad_cell_event_nonpadding_sent((circuit_t*)relay_side);
circpad_cell_event_nonpadding_sent(relay_side);
tt_int_op(relay_side->padding_info[0]->rtt_estimate_usec, OP_EQ,
rtt_estimate);
@ -380,11 +381,11 @@ test_circuitpadding_rtt(void *arg)
relay_side->padding_info[0])->histogram_edges[0]);
/* Test 3: Make sure client side machine properly ignores RTT */
circpad_cell_event_nonpadding_received((circuit_t*)client_side);
circpad_cell_event_nonpadding_received(client_side);
tt_u64_op(client_side->padding_info[0]->last_received_time_usec, OP_EQ, 0);
timers_advance_and_run(20);
circpad_cell_event_nonpadding_sent((circuit_t*)client_side);
circpad_cell_event_nonpadding_sent(client_side);
tt_u64_op(client_side->padding_info[0]->last_received_time_usec, OP_EQ, 0);
tt_int_op(client_side->padding_info[0]->rtt_estimate_usec, OP_EQ, 0);
@ -415,6 +416,7 @@ helper_create_basic_machine(void)
circ_client_machine.states[CIRCPAD_STATE_START].
next_state[CIRCPAD_EVENT_NONPADDING_RECV] = CIRCPAD_STATE_BURST;
circ_client_machine.states[CIRCPAD_STATE_START].use_rtt_estimate = 1;
circ_client_machine.states[CIRCPAD_STATE_BURST].
next_state[CIRCPAD_EVENT_PADDING_RECV] = CIRCPAD_STATE_BURST;
@ -526,7 +528,7 @@ test_circuitpadding_token_removal_higher(void *arg)
MOCK(circpad_machine_schedule_padding,circpad_machine_schedule_padding_mock);
/* Setup test environment (time etc.) */
client_side = (circuit_t *)origin_circuit_new();
client_side = TO_CIRCUIT(origin_circuit_new());
client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
monotime_enable_test_mocking();
@ -537,7 +539,7 @@ test_circuitpadding_token_removal_higher(void *arg)
circpad_circuit_machineinfo_new(client_side, 0);
/* move the machine to the right state */
circpad_cell_event_nonpadding_received((circuit_t*)client_side);
circpad_cell_event_nonpadding_received(client_side);
tt_int_op(client_side->padding_info[0]->current_state, OP_EQ,
CIRCPAD_STATE_BURST);
@ -586,12 +588,12 @@ test_circuitpadding_token_removal_higher(void *arg)
tt_int_op(mi->histogram[bin_to_remove], OP_EQ, 2);
mi->padding_scheduled_at_usec = current_time - 57;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[bin_to_remove], OP_EQ, 1);
mi->padding_scheduled_at_usec = current_time - 57;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
/* Test that we cleaned out this bin. Don't do this in the case of the last
bin since the tokens will get refilled */
@ -610,7 +612,7 @@ test_circuitpadding_token_removal_higher(void *arg)
CIRCPAD_STATE_BURST);
circ_client_machine.states[CIRCPAD_STATE_BURST].histogram_edges[0] = 100;
mi->padding_scheduled_at_usec = current_time;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[0], OP_EQ, 1);
done:
@ -631,7 +633,7 @@ test_circuitpadding_token_removal_lower(void *arg)
MOCK(circpad_machine_schedule_padding,circpad_machine_schedule_padding_mock);
/* Setup test environment (time etc.) */
client_side = (circuit_t *)origin_circuit_new();
client_side = TO_CIRCUIT(origin_circuit_new());
client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
monotime_enable_test_mocking();
@ -642,7 +644,7 @@ test_circuitpadding_token_removal_lower(void *arg)
circpad_circuit_machineinfo_new(client_side, 0);
/* move the machine to the right state */
circpad_cell_event_nonpadding_received((circuit_t*)client_side);
circpad_cell_event_nonpadding_received(client_side);
tt_int_op(client_side->padding_info[0]->current_state, OP_EQ,
CIRCPAD_STATE_BURST);
@ -683,12 +685,12 @@ test_circuitpadding_token_removal_lower(void *arg)
tt_int_op(mi->histogram[bin_to_remove], OP_EQ, 2);
mi->padding_scheduled_at_usec = current_time - 57;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[bin_to_remove], OP_EQ, 1);
mi->padding_scheduled_at_usec = current_time - 57;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
/* Test that we cleaned out this bin. Don't do this in the case of the last
bin since the tokens will get refilled */
@ -708,7 +710,7 @@ test_circuitpadding_token_removal_lower(void *arg)
circ_client_machine.states[CIRCPAD_STATE_BURST].
histogram_edges[BIG_HISTOGRAM_LEN-2] = 100;
mi->padding_scheduled_at_usec = current_time - 29202;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[BIG_HISTOGRAM_LEN-2], OP_EQ, 1);
done:
@ -729,7 +731,7 @@ test_circuitpadding_closest_token_removal(void *arg)
MOCK(circpad_machine_schedule_padding,circpad_machine_schedule_padding_mock);
/* Setup test environment (time etc.) */
client_side = (circuit_t *)origin_circuit_new();
client_side = TO_CIRCUIT(origin_circuit_new());
client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
monotime_enable_test_mocking();
@ -740,7 +742,7 @@ test_circuitpadding_closest_token_removal(void *arg)
circpad_circuit_machineinfo_new(client_side, 0);
/* move the machine to the right state */
circpad_cell_event_nonpadding_received((circuit_t*)client_side);
circpad_cell_event_nonpadding_received(client_side);
tt_int_op(client_side->padding_info[0]->current_state, OP_EQ,
CIRCPAD_STATE_BURST);
@ -780,12 +782,12 @@ test_circuitpadding_closest_token_removal(void *arg)
tt_int_op(mi->histogram[bin_to_remove], OP_EQ, 2);
mi->padding_scheduled_at_usec = current_time - 57;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[bin_to_remove], OP_EQ, 1);
mi->padding_scheduled_at_usec = current_time - 57;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
/* Test that we cleaned out this bin. Don't do this in the case of the last
bin since the tokens will get refilled */
@ -807,14 +809,14 @@ test_circuitpadding_closest_token_removal(void *arg)
circ_client_machine.states[CIRCPAD_STATE_BURST].histogram_edges[2] = 120;
mi->padding_scheduled_at_usec = current_time - 102;
mi->histogram[0] = 0;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[1], OP_EQ, 1);
/* Test above the highest bin, for coverage */
tt_int_op(client_side->padding_info[0]->current_state, OP_EQ,
CIRCPAD_STATE_BURST);
mi->padding_scheduled_at_usec = current_time - 29202;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[BIG_HISTOGRAM_LEN-2], OP_EQ, 1);
done:
@ -835,7 +837,7 @@ test_circuitpadding_closest_token_removal_usec(void *arg)
MOCK(circpad_machine_schedule_padding,circpad_machine_schedule_padding_mock);
/* Setup test environment (time etc.) */
client_side = (circuit_t *)origin_circuit_new();
client_side = TO_CIRCUIT(origin_circuit_new());
client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
monotime_enable_test_mocking();
@ -846,7 +848,7 @@ test_circuitpadding_closest_token_removal_usec(void *arg)
circpad_circuit_machineinfo_new(client_side, 0);
/* move the machine to the right state */
circpad_cell_event_nonpadding_received((circuit_t*)client_side);
circpad_cell_event_nonpadding_received(client_side);
tt_int_op(client_side->padding_info[0]->current_state, OP_EQ,
CIRCPAD_STATE_BURST);
@ -889,12 +891,12 @@ test_circuitpadding_closest_token_removal_usec(void *arg)
tt_int_op(mi->histogram[bin_to_remove], OP_EQ, 2);
mi->padding_scheduled_at_usec = current_time - 57;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[bin_to_remove], OP_EQ, 1);
mi->padding_scheduled_at_usec = current_time - 57;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
/* Test that we cleaned out this bin. Don't do this in the case of the last
bin since the tokens will get refilled */
@ -916,7 +918,7 @@ test_circuitpadding_closest_token_removal_usec(void *arg)
circ_client_machine.states[CIRCPAD_STATE_BURST].histogram_edges[2] = 120;
mi->padding_scheduled_at_usec = current_time - 102;
mi->histogram[0] = 0;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[1], OP_EQ, 1);
/* Test above the highest bin, for coverage */
@ -925,7 +927,7 @@ test_circuitpadding_closest_token_removal_usec(void *arg)
circ_client_machine.states[CIRCPAD_STATE_BURST].
histogram_edges[BIG_HISTOGRAM_LEN-2] = 100;
mi->padding_scheduled_at_usec = current_time - 29202;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[BIG_HISTOGRAM_LEN-2], OP_EQ, 1);
done:
@ -946,7 +948,7 @@ test_circuitpadding_token_removal_exact(void *arg)
MOCK(circpad_machine_schedule_padding,circpad_machine_schedule_padding_mock);
/* Setup test environment (time etc.) */
client_side = (circuit_t *)origin_circuit_new();
client_side = TO_CIRCUIT(origin_circuit_new());
client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
monotime_enable_test_mocking();
@ -957,7 +959,7 @@ test_circuitpadding_token_removal_exact(void *arg)
circpad_circuit_machineinfo_new(client_side, 0);
/* move the machine to the right state */
circpad_cell_event_nonpadding_received((circuit_t*)client_side);
circpad_cell_event_nonpadding_received(client_side);
tt_int_op(client_side->padding_info[0]->current_state, OP_EQ,
CIRCPAD_STATE_BURST);
@ -971,16 +973,16 @@ test_circuitpadding_token_removal_exact(void *arg)
/* Ensure that we will clear out bin #4 with this usec */
mi->padding_scheduled_at_usec = current_time - 57;
tt_int_op(mi->histogram[4], OP_EQ, 2);
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
mi->padding_scheduled_at_usec = current_time - 57;
tt_int_op(mi->histogram[4], OP_EQ, 1);
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->histogram[4], OP_EQ, 0);
/* Ensure that we will not remove any other tokens even tho we try to, since
* this is what the exact strategy dictates */
mi->padding_scheduled_at_usec = current_time - 57;
circpad_machine_remove_token(mi);
circpad_cell_event_nonpadding_sent(client_side);
for (int i = 0; i < BIG_HISTOGRAM_LEN ; i++) {
if (i != 4) {
tt_int_op(mi->histogram[i], OP_EQ, 2);
@ -1046,8 +1048,8 @@ test_circuitpadding_tokens(void *arg)
mi = client_side->padding_info[0];
// Pretend a non-padding cell was sent
circpad_cell_event_nonpadding_received((circuit_t*)client_side);
circpad_cell_event_nonpadding_sent((circuit_t*)client_side);
circpad_cell_event_nonpadding_received(client_side);
circpad_cell_event_nonpadding_sent(client_side);
/* We have to save the infinity bin because one inf delay
* could have been chosen when we transition to burst */
circpad_hist_token_t inf_bin = mi->histogram[4];
@ -1156,11 +1158,11 @@ test_circuitpadding_tokens(void *arg)
/* Drain the infinity bin and cause a refill */
while (inf_bin != 0) {
tt_int_op(mi->histogram[4], OP_EQ, inf_bin);
circpad_cell_event_nonpadding_received((circuit_t*)client_side);
circpad_cell_event_nonpadding_received(client_side);
inf_bin--;
}
circpad_cell_event_nonpadding_sent((circuit_t*)client_side);
circpad_cell_event_nonpadding_sent(client_side);
// We should have refilled here.
tt_int_op(mi->histogram[4], OP_EQ, 2);
@ -1284,10 +1286,10 @@ test_circuitpadding_wronghop(void *arg)
* padding that gets sent by scheduled timers. */
MOCK(circpad_machine_schedule_padding,circpad_machine_schedule_padding_mock);
client_side = (circuit_t *)origin_circuit_new();
client_side = TO_CIRCUIT(origin_circuit_new());
dummy_channel.cmux = circuitmux_alloc();
relay_side = (circuit_t *)new_fake_orcirc(&dummy_channel,
&dummy_channel);
relay_side = TO_CIRCUIT(new_fake_orcirc(&dummy_channel,
&dummy_channel));
orig_client = TO_ORIGIN_CIRCUIT(client_side);
relay_side->purpose = CIRCUIT_PURPOSE_OR;
@ -1405,9 +1407,9 @@ test_circuitpadding_wronghop(void *arg)
free_fake_origin_circuit(TO_ORIGIN_CIRCUIT(client_side));
free_fake_orcirc(relay_side);
client_side = (circuit_t *)origin_circuit_new();
relay_side = (circuit_t *)new_fake_orcirc(&dummy_channel,
&dummy_channel);
client_side = TO_CIRCUIT(origin_circuit_new());
relay_side = TO_CIRCUIT(new_fake_orcirc(&dummy_channel,
&dummy_channel));
relay_side->purpose = CIRCUIT_PURPOSE_OR;
client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
@ -1601,10 +1603,10 @@ simulate_single_hop_extend(circuit_t *client, circuit_t *mid_relay,
tor_addr_t addr;
// Pretend a non-padding cell was sent
circpad_cell_event_nonpadding_sent((circuit_t*)client);
circpad_cell_event_nonpadding_sent(client);
// Receive extend cell at middle
circpad_cell_event_nonpadding_received((circuit_t*)mid_relay);
circpad_cell_event_nonpadding_received(mid_relay);
// Advance time a tiny bit so we can calculate an RTT
curr_mocked_time += 10 * TOR_NSEC_PER_MSEC;
@ -1612,10 +1614,10 @@ simulate_single_hop_extend(circuit_t *client, circuit_t *mid_relay,
monotime_set_mock_time_nsec(curr_mocked_time);
// Receive extended cell at middle
circpad_cell_event_nonpadding_sent((circuit_t*)mid_relay);
circpad_cell_event_nonpadding_sent(mid_relay);
// Receive extended cell at first hop
circpad_cell_event_nonpadding_received((circuit_t*)client);
circpad_cell_event_nonpadding_received(client);
// Add a hop to cpath
crypt_path_t *hop = tor_malloc_zero(sizeof(crypt_path_t));
@ -1642,6 +1644,55 @@ simulate_single_hop_extend(circuit_t *client, circuit_t *mid_relay,
circpad_machine_event_circ_added_hop(TO_ORIGIN_CIRCUIT(client));
}
static circpad_machine_spec_t *
helper_create_length_machine(void)
{
circpad_machine_spec_t *ret =
tor_malloc_zero(sizeof(circpad_machine_spec_t));
/* Start, burst */
circpad_machine_states_init(ret, 2);
ret->states[CIRCPAD_STATE_START].
next_state[CIRCPAD_EVENT_PADDING_SENT] = CIRCPAD_STATE_BURST;
ret->states[CIRCPAD_STATE_BURST].
next_state[CIRCPAD_EVENT_PADDING_SENT] = CIRCPAD_STATE_BURST;
ret->states[CIRCPAD_STATE_BURST].
next_state[CIRCPAD_EVENT_LENGTH_COUNT] = CIRCPAD_STATE_END;
ret->states[CIRCPAD_STATE_BURST].
next_state[CIRCPAD_EVENT_BINS_EMPTY] = CIRCPAD_STATE_END;
/* No token removal.. end via state_length only */
ret->states[CIRCPAD_STATE_BURST].token_removal =
CIRCPAD_TOKEN_REMOVAL_NONE;
/* Let's have this one end after 12 packets */
ret->states[CIRCPAD_STATE_BURST].length_dist.type = CIRCPAD_DIST_UNIFORM;
ret->states[CIRCPAD_STATE_BURST].length_dist.param1 = 12;
ret->states[CIRCPAD_STATE_BURST].length_dist.param2 = 13;
ret->states[CIRCPAD_STATE_BURST].max_length = 12;
ret->states[CIRCPAD_STATE_BURST].histogram_len = 4;
ret->states[CIRCPAD_STATE_BURST].histogram_edges[0] = 0;
ret->states[CIRCPAD_STATE_BURST].histogram_edges[1] = 1;
ret->states[CIRCPAD_STATE_BURST].histogram_edges[2] = 1000000;
ret->states[CIRCPAD_STATE_BURST].histogram_edges[3] = 10000000;
ret->states[CIRCPAD_STATE_BURST].histogram[0] = 0;
ret->states[CIRCPAD_STATE_BURST].histogram[1] = 0;
ret->states[CIRCPAD_STATE_BURST].histogram[2] = 6;
ret->states[CIRCPAD_STATE_BURST].histogram_total_tokens = 6;
ret->states[CIRCPAD_STATE_BURST].use_rtt_estimate = 0;
ret->states[CIRCPAD_STATE_BURST].length_includes_nonpadding = 0;
return ret;
}
static circpad_machine_spec_t *
helper_create_conditional_machine(void)
{
@ -1737,6 +1788,135 @@ helper_create_conditional_machines(void)
register_padding_machine(add, relay_padding_machines);
}
void
test_circuitpadding_state_length(void *arg)
{
/**
* Test plan:
* * Explicitly test that with no token removal enabled, we hit
* the state length limit due to either padding, or non-padding.
* * Repeat test with an arbitrary token removal strategy, and
* verify that if we run out of tokens due to padding before we
* hit the state length, we still go to state end (all our
* token removal tests only test nonpadding token removal).
*/
int64_t actual_mocked_monotime_start;
(void)arg;
MOCK(circuitmux_attach_circuit, circuitmux_attach_circuit_mock);
MOCK(circpad_send_command_to_hop, circpad_send_command_to_hop_mock);
nodes_init();
dummy_channel.cmux = circuitmux_alloc();
relay_side = TO_CIRCUIT(new_fake_orcirc(&dummy_channel,
&dummy_channel));
client_side = TO_CIRCUIT(origin_circuit_new());
relay_side->purpose = CIRCUIT_PURPOSE_OR;
client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
monotime_init();
monotime_enable_test_mocking();
actual_mocked_monotime_start = MONOTIME_MOCK_START;
monotime_set_mock_time_nsec(actual_mocked_monotime_start);
monotime_coarse_set_mock_time_nsec(actual_mocked_monotime_start);
curr_mocked_time = actual_mocked_monotime_start;
/* This is needed so that we are not considered to be dormant */
note_user_activity(20);
timers_initialize();
circpad_machine_spec_t *client_machine =
helper_create_length_machine();
MOCK(circuit_package_relay_cell,
circuit_package_relay_cell_mock);
MOCK(node_get_by_id,
node_get_by_id_mock);
client_side->padding_machine[0] = client_machine;
client_side->padding_info[0] =
circpad_circuit_machineinfo_new(client_side, 0);
circpad_machine_runtime_t *mi = client_side->padding_info[0];
circpad_cell_event_padding_sent(client_side);
tt_int_op(mi->state_length, OP_EQ, 12);
tt_ptr_op(mi->histogram, OP_EQ, NULL);
/* Verify that non-padding does not change our state length */
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->state_length, OP_EQ, 12);
/* verify that sending padding changes our state length */
for (uint64_t i = mi->state_length-1; i > 0; i--) {
circpad_send_padding_cell_for_callback(mi);
tt_int_op(mi->state_length, OP_EQ, i);
}
circpad_send_padding_cell_for_callback(mi);
tt_int_op(mi->state_length, OP_EQ, -1);
tt_int_op(mi->current_state, OP_EQ, CIRCPAD_STATE_END);
/* Restart machine */
mi->current_state = CIRCPAD_STATE_START;
/* Now, count nonpadding as part of the state length */
client_machine->states[CIRCPAD_STATE_BURST].length_includes_nonpadding = 1;
circpad_cell_event_padding_sent(client_side);
tt_int_op(mi->state_length, OP_EQ, 12);
/* Verify that non-padding does change our state length now */
for (uint64_t i = mi->state_length-1; i > 0; i--) {
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->state_length, OP_EQ, i);
}
circpad_cell_event_nonpadding_sent(client_side);
tt_int_op(mi->state_length, OP_EQ, -1);
tt_int_op(mi->current_state, OP_EQ, CIRCPAD_STATE_END);
/* Now, just test token removal when we send padding */
client_machine->states[CIRCPAD_STATE_BURST].token_removal =
CIRCPAD_TOKEN_REMOVAL_EXACT;
/* Restart machine */
mi->current_state = CIRCPAD_STATE_START;
circpad_cell_event_padding_sent(client_side);
tt_int_op(mi->state_length, OP_EQ, 12);
tt_ptr_op(mi->histogram, OP_NE, NULL);
tt_int_op(mi->chosen_bin, OP_EQ, 2);
/* verify that sending padding changes our state length and
* our histogram now */
for (uint32_t i = mi->histogram[2]-1; i > 0; i--) {
circpad_send_padding_cell_for_callback(mi);
tt_int_op(mi->chosen_bin, OP_EQ, 2);
tt_int_op(mi->histogram[2], OP_EQ, i);
}
tt_int_op(mi->state_length, OP_EQ, 7);
tt_int_op(mi->histogram[2], OP_EQ, 1);
circpad_send_padding_cell_for_callback(mi);
tt_int_op(mi->current_state, OP_EQ, CIRCPAD_STATE_END);
done:
tor_free(client_machine->states);
tor_free(client_machine);
free_fake_origin_circuit(TO_ORIGIN_CIRCUIT(client_side));
free_fake_orcirc(relay_side);
circuitmux_detach_all_circuits(dummy_channel.cmux, NULL);
circuitmux_free(dummy_channel.cmux);
timers_shutdown();
monotime_disable_test_mocking();
UNMOCK(circuit_package_relay_cell);
UNMOCK(circuitmux_attach_circuit);
UNMOCK(node_get_by_id);
return;
}
void
test_circuitpadding_conditions(void *arg)
{
@ -1761,9 +1941,9 @@ test_circuitpadding_conditions(void *arg)
nodes_init();
dummy_channel.cmux = circuitmux_alloc();
relay_side = (circuit_t *)new_fake_orcirc(&dummy_channel,
&dummy_channel);
client_side = (circuit_t *)origin_circuit_new();
relay_side = TO_CIRCUIT(new_fake_orcirc(&dummy_channel,
&dummy_channel));
client_side = TO_CIRCUIT(origin_circuit_new());
relay_side->purpose = CIRCUIT_PURPOSE_OR;
client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
@ -2217,7 +2397,7 @@ test_circuitpadding_sample_distribution(void *arg)
}
/* send a non-padding cell to move to the next machine state */
circpad_cell_event_nonpadding_received((circuit_t*)client_side);
circpad_cell_event_nonpadding_received(client_side);
}
done:
@ -2329,12 +2509,12 @@ test_circuitpadding_global_rate_limiting(void *arg)
curr_mocked_time = actual_mocked_monotime_start;
timers_initialize();
client_side = (circuit_t *)origin_circuit_new();
client_side = TO_CIRCUIT(origin_circuit_new());
client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
dummy_channel.cmux = circuitmux_alloc();
/* Setup machine and circuits */
relay_side = (circuit_t *)new_fake_orcirc(&dummy_channel, &dummy_channel);
relay_side = TO_CIRCUIT(new_fake_orcirc(&dummy_channel, &dummy_channel));
relay_side->purpose = CIRCUIT_PURPOSE_OR;
helper_create_basic_machine();
relay_side->padding_machine[0] = &circ_client_machine;
@ -2555,6 +2735,7 @@ test_circuitpadding_reduce_disable(void *arg)
struct testcase_t circuitpadding_tests[] = {
TEST_CIRCUITPADDING(circuitpadding_tokens, TT_FORK),
TEST_CIRCUITPADDING(circuitpadding_state_length, TT_FORK),
TEST_CIRCUITPADDING(circuitpadding_negotiation, TT_FORK),
TEST_CIRCUITPADDING(circuitpadding_wronghop, TT_FORK),
/** Disabled unstable test until #29298 is implemented (see #29122) */