mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-10 21:23:58 +01:00
Merge branch 'maint-0.2.4'
Conflicts: src/test/test.c
This commit is contained in:
commit
6156887adf
7
changes/feature9574
Normal file
7
changes/feature9574
Normal file
@ -0,0 +1,7 @@
|
||||
o Major features:
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- Relays now process the new "NTor" circuit-level handshake requests
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with higher priority than the old "TAP" circuit-level handshake
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requests. We still process some TAP requests to not totally starve
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0.2.3 clients when NTor becomes popular. A new consensus parameter
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"NumNTorsPerTAP" lets us tune the balance later if we need to.
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Implements ticket 9574.
|
231
src/or/onion.c
231
src/or/onion.c
@ -14,6 +14,7 @@
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#include "circuitlist.h"
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#include "config.h"
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#include "cpuworker.h"
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#include "networkstatus.h"
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#include "onion.h"
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#include "onion_fast.h"
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#include "onion_ntor.h"
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@ -27,6 +28,7 @@
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typedef struct onion_queue_t {
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TOR_TAILQ_ENTRY(onion_queue_t) next;
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or_circuit_t *circ;
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uint16_t handshake_type;
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create_cell_t *onionskin;
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time_t when_added;
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} onion_queue_t;
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@ -34,13 +36,19 @@ typedef struct onion_queue_t {
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/** 5 seconds on the onion queue til we just send back a destroy */
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#define ONIONQUEUE_WAIT_CUTOFF 5
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/** Queue of circuits waiting for CPU workers, or NULL if the list is empty.*/
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TOR_TAILQ_HEAD(onion_queue_head_t, onion_queue_t) ol_list =
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TOR_TAILQ_HEAD_INITIALIZER(ol_list);
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/** Array of queues of circuits waiting for CPU workers. An element is NULL
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* if that queue is empty.*/
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TOR_TAILQ_HEAD(onion_queue_head_t, onion_queue_t)
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ol_list[MAX_ONION_HANDSHAKE_TYPE+1] = {
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TOR_TAILQ_HEAD_INITIALIZER(ol_list[0]), /* tap */
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TOR_TAILQ_HEAD_INITIALIZER(ol_list[1]), /* fast */
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TOR_TAILQ_HEAD_INITIALIZER(ol_list[2]), /* ntor */
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};
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/** Number of entries of each type currently in ol_list. */
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/** Number of entries of each type currently in each element of ol_list[]. */
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static int ol_entries[MAX_ONION_HANDSHAKE_TYPE+1];
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static int num_ntors_per_tap(void);
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static void onion_queue_entry_remove(onion_queue_t *victim);
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/* XXXX024 Check lengths vs MAX_ONIONSKIN_{CHALLENGE,REPLY}_LEN.
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@ -58,23 +66,51 @@ have_room_for_onionskin(uint16_t type)
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const or_options_t *options = get_options();
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int num_cpus;
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uint64_t tap_usec, ntor_usec;
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uint64_t ntor_during_tap_usec, tap_during_ntor_usec;
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/* If we've got fewer than 50 entries, we always have room for one more. */
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if (ol_entries[ONION_HANDSHAKE_TYPE_TAP] +
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ol_entries[ONION_HANDSHAKE_TYPE_NTOR] < 50)
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if (ol_entries[type] < 50)
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return 1;
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num_cpus = get_num_cpus(options);
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/* Compute how many microseconds we'd expect to need to clear all
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* onionskins in the current queue. */
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* onionskins in various combinations of the queues. */
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/* How long would it take to process all the TAP cells in the queue? */
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tap_usec = estimated_usec_for_onionskins(
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ol_entries[ONION_HANDSHAKE_TYPE_TAP],
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ONION_HANDSHAKE_TYPE_TAP) / num_cpus;
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/* How long would it take to process all the NTor cells in the queue? */
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ntor_usec = estimated_usec_for_onionskins(
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ol_entries[ONION_HANDSHAKE_TYPE_NTOR],
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ONION_HANDSHAKE_TYPE_NTOR) / num_cpus;
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/* How long would it take to process the tap cells that we expect to
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* process while draining the ntor queue? */
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tap_during_ntor_usec = estimated_usec_for_onionskins(
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MIN(ol_entries[ONION_HANDSHAKE_TYPE_TAP],
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ol_entries[ONION_HANDSHAKE_TYPE_NTOR] / num_ntors_per_tap()),
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ONION_HANDSHAKE_TYPE_TAP) / num_cpus;
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/* How long would it take to process the ntor cells that we expect to
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* process while draining the tap queue? */
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ntor_during_tap_usec = estimated_usec_for_onionskins(
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MIN(ol_entries[ONION_HANDSHAKE_TYPE_NTOR],
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ol_entries[ONION_HANDSHAKE_TYPE_TAP] * num_ntors_per_tap()),
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||||
ONION_HANDSHAKE_TYPE_NTOR) / num_cpus;
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||||
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/* See whether that exceeds MaxOnionQueueDelay. If so, we can't queue
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* this. */
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if ((tap_usec + ntor_usec) / 1000 > (uint64_t)options->MaxOnionQueueDelay)
|
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if (type == ONION_HANDSHAKE_TYPE_NTOR &&
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(ntor_usec + tap_during_ntor_usec) / 1000 >
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(uint64_t)options->MaxOnionQueueDelay)
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return 0;
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|
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if (type == ONION_HANDSHAKE_TYPE_TAP &&
|
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(tap_usec + ntor_during_tap_usec) / 1000 >
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(uint64_t)options->MaxOnionQueueDelay)
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return 0;
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#ifdef CURVE25519_ENABLED
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/* If we support the ntor handshake, then don't let TAP handshakes use
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* more than 2/3 of the space on the queue. */
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@ -97,8 +133,15 @@ onion_pending_add(or_circuit_t *circ, create_cell_t *onionskin)
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onion_queue_t *tmp;
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time_t now = time(NULL);
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|
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if (onionskin->handshake_type > MAX_ONION_HANDSHAKE_TYPE) {
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log_warn(LD_BUG, "Handshake %d out of range! Dropping.",
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onionskin->handshake_type);
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return -1;
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}
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tmp = tor_malloc_zero(sizeof(onion_queue_t));
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tmp->circ = circ;
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tmp->handshake_type = onionskin->handshake_type;
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tmp->onionskin = onionskin;
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tmp->when_added = now;
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@ -107,7 +150,8 @@ onion_pending_add(or_circuit_t *circ, create_cell_t *onionskin)
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static ratelim_t last_warned =
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RATELIM_INIT(WARN_TOO_MANY_CIRC_CREATIONS_INTERVAL);
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char *m;
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if ((m = rate_limit_log(&last_warned, approx_time()))) {
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if (onionskin->handshake_type == ONION_HANDSHAKE_TYPE_NTOR &&
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(m = rate_limit_log(&last_warned, approx_time()))) {
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log_warn(LD_GENERAL,
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"Your computer is too slow to handle this many circuit "
|
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"creation requests! Please consider using the "
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@ -120,12 +164,17 @@ onion_pending_add(or_circuit_t *circ, create_cell_t *onionskin)
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}
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++ol_entries[onionskin->handshake_type];
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log_info(LD_OR, "New create (%s). Queues now ntor=%d and tap=%d.",
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onionskin->handshake_type == ONION_HANDSHAKE_TYPE_NTOR ? "ntor" : "tap",
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ol_entries[ONION_HANDSHAKE_TYPE_NTOR],
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ol_entries[ONION_HANDSHAKE_TYPE_TAP]);
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circ->onionqueue_entry = tmp;
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TOR_TAILQ_INSERT_TAIL(&ol_list, tmp, next);
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TOR_TAILQ_INSERT_TAIL(&ol_list[onionskin->handshake_type], tmp, next);
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||||
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/* cull elderly requests. */
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while (1) {
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onion_queue_t *head = TOR_TAILQ_FIRST(&ol_list);
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onion_queue_t *head = TOR_TAILQ_FIRST(&ol_list[onionskin->handshake_type]);
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if (now - head->when_added < (time_t)ONIONQUEUE_WAIT_CUTOFF)
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break;
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@ -139,24 +188,87 @@ onion_pending_add(or_circuit_t *circ, create_cell_t *onionskin)
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return 0;
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}
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|
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/** Remove the first item from ol_list and return it, or return
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* NULL if the list is empty.
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/** Return a fairness parameter, to prefer processing NTOR style
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* handshakes but still slowly drain the TAP queue so we don't starve
|
||||
* it entirely. */
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static int
|
||||
num_ntors_per_tap(void)
|
||||
{
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||||
#define DEFAULT_NUM_NTORS_PER_TAP 10
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#define MIN_NUM_NTORS_PER_TAP 1
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#define MAX_NUM_NTORS_PER_TAP 100000
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return networkstatus_get_param(NULL, "NumNTorsPerTAP",
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DEFAULT_NUM_NTORS_PER_TAP,
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MIN_NUM_NTORS_PER_TAP,
|
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MAX_NUM_NTORS_PER_TAP);
|
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}
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|
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/** Choose which onion queue we'll pull from next. If one is empty choose
|
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* the other; if they both have elements, load balance across them but
|
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* favoring NTOR. */
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static uint16_t
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decide_next_handshake_type(void)
|
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{
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/* The number of times we've chosen ntor lately when both were available. */
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static int recently_chosen_ntors = 0;
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if (!ol_entries[ONION_HANDSHAKE_TYPE_NTOR])
|
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return ONION_HANDSHAKE_TYPE_TAP; /* no ntors? try tap */
|
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|
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if (!ol_entries[ONION_HANDSHAKE_TYPE_TAP]) {
|
||||
|
||||
/* Nick wants us to prioritize new tap requests when there aren't
|
||||
* any in the queue and we've processed k ntor cells since the last
|
||||
* tap cell. This strategy is maybe a good idea, since it starves tap
|
||||
* less in the case where tap is rare, or maybe a poor idea, since it
|
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* makes the new tap cell unfairly jump in front of ntor cells that
|
||||
* got here first. In any case this edge case will only become relevant
|
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* once tap is rare. We should reevaluate whether we like this decision
|
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* once tap gets more rare. */
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if (ol_entries[ONION_HANDSHAKE_TYPE_NTOR])
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++recently_chosen_ntors;
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return ONION_HANDSHAKE_TYPE_NTOR; /* no taps? try ntor */
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}
|
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|
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/* They both have something queued. Pick ntor if we haven't done that
|
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* too much lately. */
|
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if (++recently_chosen_ntors <= num_ntors_per_tap()) {
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return ONION_HANDSHAKE_TYPE_NTOR;
|
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}
|
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|
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/* Else, it's time to let tap have its turn. */
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recently_chosen_ntors = 0;
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return ONION_HANDSHAKE_TYPE_TAP;
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}
|
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|
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/** Remove the highest priority item from ol_list[] and return it, or
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* return NULL if the lists are empty.
|
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*/
|
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or_circuit_t *
|
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onion_next_task(create_cell_t **onionskin_out)
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{
|
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or_circuit_t *circ;
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onion_queue_t *head = TOR_TAILQ_FIRST(&ol_list);
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uint16_t handshake_to_choose = decide_next_handshake_type();
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onion_queue_t *head = TOR_TAILQ_FIRST(&ol_list[handshake_to_choose]);
|
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|
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if (!head)
|
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return NULL; /* no onions pending, we're done */
|
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|
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tor_assert(head->circ);
|
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tor_assert(head->circ->p_chan); /* make sure it's still valid */
|
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tor_assert(head->handshake_type <= MAX_ONION_HANDSHAKE_TYPE);
|
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// tor_assert(head->circ->p_chan); /* make sure it's still valid */
|
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/* XXX I only commented out the above line to make the unit tests
|
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* more manageable. That's probably not good long-term. -RD */
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circ = head->circ;
|
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if (head->onionskin &&
|
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head->onionskin->handshake_type <= MAX_ONION_HANDSHAKE_TYPE)
|
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--ol_entries[head->onionskin->handshake_type];
|
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if (head->onionskin)
|
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--ol_entries[head->handshake_type];
|
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log_info(LD_OR, "Processing create (%s). Queues now ntor=%d and tap=%d.",
|
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head->handshake_type == ONION_HANDSHAKE_TYPE_NTOR ? "ntor" : "tap",
|
||||
ol_entries[ONION_HANDSHAKE_TYPE_NTOR],
|
||||
ol_entries[ONION_HANDSHAKE_TYPE_TAP]);
|
||||
|
||||
*onionskin_out = head->onionskin;
|
||||
head->onionskin = NULL; /* prevent free. */
|
||||
circ->onionqueue_entry = NULL;
|
||||
@ -164,6 +276,14 @@ onion_next_task(create_cell_t **onionskin_out)
|
||||
return circ;
|
||||
}
|
||||
|
||||
/** Return the number of <b>handshake_type</b>-style create requests pending.
|
||||
*/
|
||||
int
|
||||
onion_num_pending(uint16_t handshake_type)
|
||||
{
|
||||
return ol_entries[handshake_type];
|
||||
}
|
||||
|
||||
/** Go through ol_list, find the onion_queue_t element which points to
|
||||
* circ, remove and free that element. Leave circ itself alone.
|
||||
*/
|
||||
@ -185,14 +305,20 @@ onion_pending_remove(or_circuit_t *circ)
|
||||
static void
|
||||
onion_queue_entry_remove(onion_queue_t *victim)
|
||||
{
|
||||
TOR_TAILQ_REMOVE(&ol_list, victim, next);
|
||||
if (victim->handshake_type > MAX_ONION_HANDSHAKE_TYPE) {
|
||||
log_warn(LD_BUG, "Handshake %d out of range! Dropping.",
|
||||
victim->handshake_type);
|
||||
/* XXX leaks */
|
||||
return;
|
||||
}
|
||||
|
||||
TOR_TAILQ_REMOVE(&ol_list[victim->handshake_type], victim, next);
|
||||
|
||||
if (victim->circ)
|
||||
victim->circ->onionqueue_entry = NULL;
|
||||
|
||||
if (victim->onionskin &&
|
||||
victim->onionskin->handshake_type <= MAX_ONION_HANDSHAKE_TYPE)
|
||||
--ol_entries[victim->onionskin->handshake_type];
|
||||
if (victim->onionskin)
|
||||
--ol_entries[victim->handshake_type];
|
||||
|
||||
tor_free(victim->onionskin);
|
||||
tor_free(victim);
|
||||
@ -203,8 +329,11 @@ void
|
||||
clear_pending_onions(void)
|
||||
{
|
||||
onion_queue_t *victim;
|
||||
while ((victim = TOR_TAILQ_FIRST(&ol_list))) {
|
||||
onion_queue_entry_remove(victim);
|
||||
int i;
|
||||
for (i=0; i<=MAX_ONION_HANDSHAKE_TYPE; i++) {
|
||||
while ((victim = TOR_TAILQ_FIRST(&ol_list[i]))) {
|
||||
onion_queue_entry_remove(victim);
|
||||
}
|
||||
}
|
||||
memset(ol_entries, 0, sizeof(ol_entries));
|
||||
}
|
||||
@ -513,6 +642,22 @@ check_create_cell(const create_cell_t *cell, int unknown_ok)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/** Write the various parameters into the create cell. Separate from
|
||||
* create_cell_parse() to make unit testing easier.
|
||||
*/
|
||||
void
|
||||
create_cell_init(create_cell_t *cell_out, uint8_t cell_type,
|
||||
uint16_t handshake_type, uint16_t handshake_len,
|
||||
const uint8_t *onionskin)
|
||||
{
|
||||
memset(cell_out, 0, sizeof(*cell_out));
|
||||
|
||||
cell_out->cell_type = cell_type;
|
||||
cell_out->handshake_type = handshake_type;
|
||||
cell_out->handshake_len = handshake_len;
|
||||
memcpy(cell_out->onionskin, onionskin, handshake_len);
|
||||
}
|
||||
|
||||
/** Helper: parse the CREATE2 payload at <b>p</b>, which could be up to
|
||||
* <b>p_len</b> bytes long, and use it to fill the fields of
|
||||
* <b>cell_out</b>. Return 0 on success and -1 on failure.
|
||||
@ -523,17 +668,21 @@ check_create_cell(const create_cell_t *cell, int unknown_ok)
|
||||
static int
|
||||
parse_create2_payload(create_cell_t *cell_out, const uint8_t *p, size_t p_len)
|
||||
{
|
||||
uint16_t handshake_type, handshake_len;
|
||||
|
||||
if (p_len < 4)
|
||||
return -1;
|
||||
cell_out->cell_type = CELL_CREATE2;
|
||||
cell_out->handshake_type = ntohs(get_uint16(p));
|
||||
cell_out->handshake_len = ntohs(get_uint16(p+2));
|
||||
if (cell_out->handshake_len > CELL_PAYLOAD_SIZE - 4 ||
|
||||
cell_out->handshake_len > p_len - 4)
|
||||
|
||||
handshake_type = ntohs(get_uint16(p));
|
||||
handshake_len = ntohs(get_uint16(p+2));
|
||||
|
||||
if (handshake_len > CELL_PAYLOAD_SIZE - 4 || handshake_len > p_len - 4)
|
||||
return -1;
|
||||
if (cell_out->handshake_type == ONION_HANDSHAKE_TYPE_FAST)
|
||||
if (handshake_type == ONION_HANDSHAKE_TYPE_FAST)
|
||||
return -1;
|
||||
memcpy(cell_out->onionskin, p+4, cell_out->handshake_len);
|
||||
|
||||
create_cell_init(cell_out, CELL_CREATE2, handshake_type, handshake_len,
|
||||
p+4);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -551,27 +700,19 @@ parse_create2_payload(create_cell_t *cell_out, const uint8_t *p, size_t p_len)
|
||||
int
|
||||
create_cell_parse(create_cell_t *cell_out, const cell_t *cell_in)
|
||||
{
|
||||
memset(cell_out, 0, sizeof(*cell_out));
|
||||
|
||||
switch (cell_in->command) {
|
||||
case CELL_CREATE:
|
||||
cell_out->cell_type = CELL_CREATE;
|
||||
if (tor_memeq(cell_in->payload, NTOR_CREATE_MAGIC, 16)) {
|
||||
cell_out->handshake_type = ONION_HANDSHAKE_TYPE_NTOR;
|
||||
cell_out->handshake_len = NTOR_ONIONSKIN_LEN;
|
||||
memcpy(cell_out->onionskin, cell_in->payload+16, NTOR_ONIONSKIN_LEN);
|
||||
create_cell_init(cell_out, CELL_CREATE, ONION_HANDSHAKE_TYPE_NTOR,
|
||||
NTOR_ONIONSKIN_LEN, cell_in->payload+16);
|
||||
} else {
|
||||
cell_out->handshake_type = ONION_HANDSHAKE_TYPE_TAP;
|
||||
cell_out->handshake_len = TAP_ONIONSKIN_CHALLENGE_LEN;
|
||||
memcpy(cell_out->onionskin, cell_in->payload,
|
||||
TAP_ONIONSKIN_CHALLENGE_LEN);
|
||||
create_cell_init(cell_out, CELL_CREATE, ONION_HANDSHAKE_TYPE_TAP,
|
||||
TAP_ONIONSKIN_CHALLENGE_LEN, cell_in->payload);
|
||||
}
|
||||
break;
|
||||
case CELL_CREATE_FAST:
|
||||
cell_out->cell_type = CELL_CREATE_FAST;
|
||||
cell_out->handshake_type = ONION_HANDSHAKE_TYPE_FAST;
|
||||
cell_out->handshake_len = CREATE_FAST_LEN;
|
||||
memcpy(cell_out->onionskin, cell_in->payload, CREATE_FAST_LEN);
|
||||
create_cell_init(cell_out, CELL_CREATE_FAST, ONION_HANDSHAKE_TYPE_FAST,
|
||||
CREATE_FAST_LEN, cell_in->payload);
|
||||
break;
|
||||
case CELL_CREATE2:
|
||||
if (parse_create2_payload(cell_out, cell_in->payload,
|
||||
|
@ -15,6 +15,7 @@
|
||||
struct create_cell_t;
|
||||
int onion_pending_add(or_circuit_t *circ, struct create_cell_t *onionskin);
|
||||
or_circuit_t *onion_next_task(struct create_cell_t **onionskin_out);
|
||||
int onion_num_pending(uint16_t handshake_type);
|
||||
void onion_pending_remove(or_circuit_t *circ);
|
||||
void clear_pending_onions(void);
|
||||
|
||||
@ -99,6 +100,9 @@ typedef struct extended_cell_t {
|
||||
created_cell_t created_cell;
|
||||
} extended_cell_t;
|
||||
|
||||
void create_cell_init(create_cell_t *cell_out, uint8_t cell_type,
|
||||
uint16_t handshake_type, uint16_t handshake_len,
|
||||
const uint8_t *onionskin);
|
||||
int create_cell_parse(create_cell_t *cell_out, const cell_t *cell_in);
|
||||
int created_cell_parse(created_cell_t *cell_out, const cell_t *cell_in);
|
||||
int extend_cell_parse(extend_cell_t *cell_out, const uint8_t command,
|
||||
|
@ -41,6 +41,8 @@ long int lround(double x);
|
||||
double fabs(double x);
|
||||
|
||||
#include "or.h"
|
||||
#include "buffers.h"
|
||||
#include "circuitlist.h"
|
||||
#include "circuitstats.h"
|
||||
#include "config.h"
|
||||
#include "connection_edge.h"
|
||||
@ -50,6 +52,7 @@ double fabs(double x);
|
||||
#include "torgzip.h"
|
||||
#include "mempool.h"
|
||||
#include "memarea.h"
|
||||
#include "onion.h"
|
||||
#include "onion_tap.h"
|
||||
#include "policies.h"
|
||||
#include "rephist.h"
|
||||
@ -401,6 +404,49 @@ test_ntor_handshake(void *arg)
|
||||
}
|
||||
#endif
|
||||
|
||||
/** Run unit tests for the onion queues. */
|
||||
static void
|
||||
test_onion_queues(void)
|
||||
{
|
||||
uint8_t buf1[TAP_ONIONSKIN_CHALLENGE_LEN] = {0};
|
||||
uint8_t buf2[NTOR_ONIONSKIN_LEN] = {0};
|
||||
|
||||
or_circuit_t *circ1 = or_circuit_new(0, NULL);
|
||||
or_circuit_t *circ2 = or_circuit_new(0, NULL);
|
||||
|
||||
create_cell_t *onionskin = NULL;
|
||||
create_cell_t *create1 = tor_malloc_zero(sizeof(create_cell_t));
|
||||
create_cell_t *create2 = tor_malloc_zero(sizeof(create_cell_t));
|
||||
|
||||
create_cell_init(create1, CELL_CREATE, ONION_HANDSHAKE_TYPE_TAP,
|
||||
TAP_ONIONSKIN_CHALLENGE_LEN, buf1);
|
||||
create_cell_init(create2, CELL_CREATE, ONION_HANDSHAKE_TYPE_NTOR,
|
||||
NTOR_ONIONSKIN_LEN, buf2);
|
||||
|
||||
test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
|
||||
test_eq(0, onion_pending_add(circ1, create1));
|
||||
test_eq(1, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
|
||||
|
||||
test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
|
||||
test_eq(0, onion_pending_add(circ2, create2));
|
||||
test_eq(1, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
|
||||
|
||||
test_eq_ptr(circ2, onion_next_task(&onionskin));
|
||||
test_eq(1, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
|
||||
test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
|
||||
|
||||
clear_pending_onions();
|
||||
test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
|
||||
test_eq(0, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
|
||||
|
||||
done:
|
||||
;
|
||||
// circuit_free(circ1);
|
||||
// circuit_free(circ2);
|
||||
/* and free create1 and create2 */
|
||||
/* XXX leaks everything here */
|
||||
}
|
||||
|
||||
static void
|
||||
test_circuit_timeout(void)
|
||||
{
|
||||
@ -1541,6 +1587,7 @@ const struct testcase_setup_t legacy_setup = {
|
||||
static struct testcase_t test_array[] = {
|
||||
ENT(onion_handshake),
|
||||
{ "bad_onion_handshake", test_bad_onion_handshake, 0, NULL, NULL },
|
||||
ENT(onion_queues),
|
||||
#ifdef CURVE25519_ENABLED
|
||||
{ "ntor_handshake", test_ntor_handshake, 0, NULL, NULL },
|
||||
#endif
|
||||
|
Loading…
Reference in New Issue
Block a user