mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-27 22:03:31 +01:00
cc: Add comments and clean up some syntax
Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
parent
322f213210
commit
bfd69655af
@ -26,30 +26,45 @@
|
||||
#include "lib/time/compat_time.h"
|
||||
#include "feature/nodelist/networkstatus.h"
|
||||
|
||||
/* Consensus parameter defaults */
|
||||
/* Consensus parameter defaults.
|
||||
*
|
||||
* More details for each of the parameters can be found in proposal 324,
|
||||
* section 6.5 including tuning notes. */
|
||||
#define CIRCWINDOW_INIT (500)
|
||||
|
||||
#define CWND_INC_PCT_SS_DFLT (100)
|
||||
|
||||
#define SENDME_INC_DFLT (50)
|
||||
#define CWND_MIN_DFLT (MAX(100, SENDME_INC_DFLT))
|
||||
#define CWND_MAX_DFLT (INT32_MAX)
|
||||
#define SENDME_INC_DFLT (50)
|
||||
|
||||
#define CWND_INC_DFLT (50)
|
||||
|
||||
#define CWND_INC_PCT_SS_DFLT (100)
|
||||
#define CWND_INC_RATE_DFLT (1)
|
||||
#define CWND_MAX_DFLT (INT32_MAX)
|
||||
#define CWND_MIN_DFLT (MAX(100, SENDME_INC_DFLT))
|
||||
|
||||
#define BWE_SENDME_MIN_DFLT (5)
|
||||
#define EWMA_CWND_COUNT_DFLT (2)
|
||||
|
||||
/* BDP algorithms for each congestion control algorithms use the piecewise
|
||||
* estimattor. See section 3.1.4 of proposal 324. */
|
||||
#define WESTWOOD_BDP_ALG BDP_ALG_PIECEWISE
|
||||
#define VEGAS_BDP_MIX_ALG BDP_ALG_PIECEWISE
|
||||
#define NOLA_BDP_ALG BDP_ALG_PIECEWISE
|
||||
|
||||
#define EWMA_CWND_COUNT_DFLT 2
|
||||
|
||||
#define BWE_SENDME_MIN_DFLT 5
|
||||
|
||||
/* Indicate OR connection buffer limitations used to stop or start accepting
|
||||
* cells in its outbuf.
|
||||
*
|
||||
* These watermarks are historical to tor in a sense that they've been used
|
||||
* almost from the genesis point. And were likely defined to fit the bounds of
|
||||
* TLS records of 16KB which would be around 32 cells.
|
||||
*
|
||||
* These are defaults of the consensus parameter "orconn_high" and "orconn_low"
|
||||
* values. */
|
||||
#define OR_CONN_HIGHWATER_DFLT (32*1024)
|
||||
#define OR_CONN_LOWWATER_DFLT (16*1024)
|
||||
|
||||
/* Low and high values of circuit cell queue sizes. They are used to tell when
|
||||
* to start or stop reading on the streams attached on the circuit.
|
||||
*
|
||||
* These are defaults of the consensus parameters "cellq_high" and "cellq_low".
|
||||
*/
|
||||
#define CELL_QUEUE_LOW_DFLT (10)
|
||||
#define CELL_QUEUE_HIGH_DFLT (256)
|
||||
|
||||
@ -60,12 +75,12 @@ static bool congestion_control_update_circuit_bdp(congestion_control_t *,
|
||||
const crypt_path_t *,
|
||||
uint64_t, uint64_t);
|
||||
|
||||
/* Consensus parameters cached. The non static ones are extern. */
|
||||
static uint32_t cwnd_max = CWND_MAX_DFLT;
|
||||
uint32_t or_conn_highwater = OR_CONN_HIGHWATER_DFLT;
|
||||
uint32_t or_conn_lowwater = OR_CONN_LOWWATER_DFLT;
|
||||
|
||||
int32_t cell_queue_high = CELL_QUEUE_HIGH_DFLT;
|
||||
int32_t cell_queue_low = CELL_QUEUE_LOW_DFLT;
|
||||
uint32_t or_conn_highwater = OR_CONN_HIGHWATER_DFLT;
|
||||
uint32_t or_conn_lowwater = OR_CONN_LOWWATER_DFLT;
|
||||
|
||||
/**
|
||||
* Update global congestion control related consensus parameter values,
|
||||
|
@ -32,28 +32,34 @@ static uint32_t xoff_client;
|
||||
static uint32_t xoff_exit;
|
||||
|
||||
static uint32_t xon_change_pct;
|
||||
static uint32_t xon_rate_bytes;
|
||||
static uint32_t xon_ewma_cnt;
|
||||
static uint32_t xon_rate_bytes;
|
||||
|
||||
/** In normal operation, we can get a burst of up to 32 cells before
|
||||
* returning to libevent to flush the outbuf. This is a heuristic from
|
||||
* hardcoded values and strange logic in connection_bucket_get_share(). */
|
||||
/* In normal operation, we can get a burst of up to 32 cells before returning
|
||||
* to libevent to flush the outbuf. This is a heuristic from hardcoded values
|
||||
* and strange logic in connection_bucket_get_share(). */
|
||||
#define MAX_EXPECTED_CELL_BURST 32
|
||||
|
||||
/**
|
||||
* The following three are for dropmark rate limiting. They define when
|
||||
* we scale down our XON, XOFF, and xmit byte counts. Early scaling
|
||||
* is beneficial because it limits the ability of spurious XON/XOFF
|
||||
* to be sent after large amounts of data without XON/XOFF. At these
|
||||
* limits, after 10MB of data (or more), an adversary can only inject
|
||||
* (log2(10MB)-log2(200*500))*100 ~= 1000 cells of fake XOFF/XON before
|
||||
* the xmit byte * count will be halved enough to triggering a limit. */
|
||||
/* The following three are for dropmark rate limiting. They define when we
|
||||
* scale down our XON, XOFF, and xmit byte counts. Early scaling is beneficial
|
||||
* because it limits the ability of spurious XON/XOFF to be sent after large
|
||||
* amounts of data without XON/XOFF. At these limits, after 10MB of data (or
|
||||
* more), an adversary can only inject (log2(10MB)-log2(200*500))*100 ~= 1000
|
||||
* cells of fake XOFF/XON before the xmit byte count will be halved enough to
|
||||
* triggering a limit. */
|
||||
#define XON_COUNT_SCALE_AT 200
|
||||
#define XOFF_COUNT_SCALE_AT 200
|
||||
#define ONE_MEGABYTE (UINT64_C(1) << 20)
|
||||
#define TOTAL_XMIT_SCALE_AT 10*ONE_MEGABYTE
|
||||
#define TOTAL_XMIT_SCALE_AT (10 * ONE_MEGABYTE)
|
||||
|
||||
static const congestion_control_t *
|
||||
/**
|
||||
* Return the congestion control object of the given edge connection.
|
||||
*
|
||||
* Returns NULL if the edge connection doesn't have a cpath_layer or not
|
||||
* attached to a circuit. But also if the cpath_layer or circuit doesn't have a
|
||||
* congestion control object.
|
||||
*/
|
||||
static inline const congestion_control_t *
|
||||
edge_get_ccontrol(const edge_connection_t *edge)
|
||||
{
|
||||
if (edge->cpath_layer)
|
||||
@ -64,6 +70,13 @@ edge_get_ccontrol(const edge_connection_t *edge)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* Update global congestion control related consensus parameter values, every
|
||||
* consensus update.
|
||||
*
|
||||
* More details for each of the parameters can be found in proposal 324,
|
||||
* section 6.5 including tuning notes.
|
||||
*/
|
||||
void
|
||||
flow_control_new_consensus_params(const networkstatus_t *ns)
|
||||
{
|
||||
|
Loading…
Reference in New Issue
Block a user