mirrors/tor
1
0
Fork 0
mirror of https://gitlab.torproject.org/tpo/core/tor.git synced 2024-11-20 02:09:24 +01:00
Code Issues Projects Releases Wiki Activity

Be more general in calculating expected onion queue processing time

Browse Source 
Now we consider the TAP cells we'll process while draining the NTor
queue, and vice versa.
This commit is contained in:
Roger Dingledine 2013-09-03 22:15:33 -04:00
parent a66791230f
commit a4400952ee
1 changed files with 27 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/or/onion.c
View File

@ -49,6 +49,7 @@ TOR_TAILQ_HEAD(onion_queue_head_t, onion_queue_t)
/** Number of entries of each type currently in each element of ol_list[]. */
static int ol_entries[MAX_ONION_HANDSHAKE_TYPE+1];
static int num_ntors_per_tap(void);
static void onion_queue_entry_remove(onion_queue_t *victim);
/* XXXX024 Check lengths vs MAX_ONIONSKIN_{CHALLENGE,REPLY}_LEN.
@ -66,27 +67,49 @@ have_room_for_onionskin(uint16_t type)
const or_options_t *options = get_options();
int num_cpus;
uint64_t tap_usec, ntor_usec;
uint64_t ntor_during_tap_usec, tap_during_ntor_usec;
/* If we've got fewer than 50 entries, we always have room for one more. */
if (ol_entries[type] < 50)
return 1;
num_cpus = get_num_cpus(options);
/* Compute how many microseconds we'd expect to need to clear all
* onionskins in the current queue. */
* onionskins in various combinations of the queues. */
/* How long would it take to process all the TAP cells in the queue? */
tap_usec = estimated_usec_for_onionskins(
ol_entries[ONION_HANDSHAKE_TYPE_TAP],
ONION_HANDSHAKE_TYPE_TAP) / num_cpus;
/* How long would it take to process all the NTor cells in the queue? */
ntor_usec = estimated_usec_for_onionskins(
ol_entries[ONION_HANDSHAKE_TYPE_NTOR],
ONION_HANDSHAKE_TYPE_NTOR) / num_cpus;
/* How long would it take to process the tap cells that we expect to
* process while draining the ntor queue? */
tap_during_ntor_usec = estimated_usec_for_onionskins(
MIN(ol_entries[ONION_HANDSHAKE_TYPE_TAP],
ol_entries[ONION_HANDSHAKE_TYPE_NTOR] / num_ntors_per_tap()),
ONION_HANDSHAKE_TYPE_TAP) / num_cpus;
/* How long would it take to process the ntor cells that we expect to
* process while draining the tap queue? */
ntor_during_tap_usec = estimated_usec_for_onionskins(
MIN(ol_entries[ONION_HANDSHAKE_TYPE_NTOR],
ol_entries[ONION_HANDSHAKE_TYPE_TAP] * num_ntors_per_tap()),
ONION_HANDSHAKE_TYPE_NTOR) / num_cpus;
/* See whether that exceeds MaxOnionQueueDelay. If so, we can't queue
* this. */
if (type == ONION_HANDSHAKE_TYPE_NTOR &&
ntor_usec / 1000 > (uint64_t)options->MaxOnionQueueDelay)
(ntor_usec + tap_during_ntor_usec) / 1000 >
(uint64_t)options->MaxOnionQueueDelay)
return 0;
if (type == ONION_HANDSHAKE_TYPE_TAP &&
(tap_usec + ntor_usec) / 1000 > (uint64_t)options->MaxOnionQueueDelay)
(tap_usec + ntor_during_tap_usec) / 1000 >
(uint64_t)options->MaxOnionQueueDelay)
return 0;
#ifdef CURVE25519_ENABLED
@ -173,7 +196,7 @@ static int
num_ntors_per_tap(void)
{
#define DEFAULT_NUM_NTORS_PER_TAP 10
#define MIN_NUM_NTORS_PER_TAP 0
#define MIN_NUM_NTORS_PER_TAP 1
#define MAX_NUM_NTORS_PER_TAP 100000
return networkstatus_get_param(NULL, "NumNTorsPerTAP",