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#include "internal/quic_cc.h"
#include "internal/quic_types.h"
#include "internal/safe_math.h"
OSSL_SAFE_MATH_UNSIGNED(u64, uint64_t)
typedef struct ossl_cc_newreno_st {
/* Dependencies. */
OSSL_TIME (*now_cb)(void *arg);
void *now_cb_arg;
/* 'Constants' (which we allow to be configurable). */
uint64_t k_init_wnd, k_min_wnd;
uint32_t k_loss_reduction_factor_num, k_loss_reduction_factor_den;
uint32_t persistent_cong_thresh;
/* State. */
size_t max_dgram_size;
uint64_t bytes_in_flight, cong_wnd, slow_start_thresh, bytes_acked;
OSSL_TIME cong_recovery_start_time;
/* Unflushed state during multiple on-loss calls. */
int processing_loss; /* 1 if not flushed */
OSSL_TIME tx_time_of_last_loss;
/* Diagnostic state. */
int in_congestion_recovery;
/* Diagnostic output locations. */
size_t *p_diag_max_dgram_payload_len;
uint64_t *p_diag_cur_cwnd_size;
uint64_t *p_diag_min_cwnd_size;
uint64_t *p_diag_cur_bytes_in_flight;
uint32_t *p_diag_cur_state;
} OSSL_CC_NEWRENO;
#define MIN_MAX_INIT_WND_SIZE 14720 /* RFC 9002 s. 7.2 */
/* TODO(QUIC FUTURE): Pacing support. */
static void newreno_set_max_dgram_size(OSSL_CC_NEWRENO *nr,
size_t max_dgram_size);
static void newreno_update_diag(OSSL_CC_NEWRENO *nr);
static void newreno_reset(OSSL_CC_DATA *cc);
static OSSL_CC_DATA *newreno_new(OSSL_TIME (*now_cb)(void *arg),
void *now_cb_arg)
{
OSSL_CC_NEWRENO *nr;
if ((nr = OPENSSL_zalloc(sizeof(*nr))) == NULL)
return NULL;
nr->now_cb = now_cb;
nr->now_cb_arg = now_cb_arg;
newreno_set_max_dgram_size(nr, QUIC_MIN_INITIAL_DGRAM_LEN);
newreno_reset((OSSL_CC_DATA *)nr);
return (OSSL_CC_DATA *)nr;
}
static void newreno_free(OSSL_CC_DATA *cc)
{
OPENSSL_free(cc);
}
static void newreno_set_max_dgram_size(OSSL_CC_NEWRENO *nr,
size_t max_dgram_size)
{
size_t max_init_wnd;
int is_reduced = (max_dgram_size < nr->max_dgram_size);
nr->max_dgram_size = max_dgram_size;
max_init_wnd = 2 * max_dgram_size;
if (max_init_wnd < MIN_MAX_INIT_WND_SIZE)
max_init_wnd = MIN_MAX_INIT_WND_SIZE;
nr->k_init_wnd = 10 * max_dgram_size;
if (nr->k_init_wnd > max_init_wnd)
nr->k_init_wnd = max_init_wnd;
nr->k_min_wnd = 2 * max_dgram_size;
if (is_reduced)
nr->cong_wnd = nr->k_init_wnd;
newreno_update_diag(nr);
}
static void newreno_reset(OSSL_CC_DATA *cc)
{
OSSL_CC_NEWRENO *nr = (OSSL_CC_NEWRENO *)cc;
nr->k_loss_reduction_factor_num = 1;
nr->k_loss_reduction_factor_den = 2;
nr->persistent_cong_thresh = 3;
nr->cong_wnd = nr->k_init_wnd;
nr->bytes_in_flight = 0;
nr->bytes_acked = 0;
nr->slow_start_thresh = UINT64_MAX;
nr->cong_recovery_start_time = ossl_time_zero();
nr->processing_loss = 0;
nr->tx_time_of_last_loss = ossl_time_zero();
nr->in_congestion_recovery = 0;
}
static int newreno_set_input_params(OSSL_CC_DATA *cc, const OSSL_PARAM *params)
{
OSSL_CC_NEWRENO *nr = (OSSL_CC_NEWRENO *)cc;
const OSSL_PARAM *p;
size_t value;
p = OSSL_PARAM_locate_const(params, OSSL_CC_OPTION_MAX_DGRAM_PAYLOAD_LEN);
if (p != NULL) {
if (!OSSL_PARAM_get_size_t(p, &value))
return 0;
if (value < QUIC_MIN_INITIAL_DGRAM_LEN)
return 0;
newreno_set_max_dgram_size(nr, value);
}
return 1;
}
static int bind_diag(OSSL_PARAM *params, const char *param_name, size_t len,
void **pp)
{
const OSSL_PARAM *p = OSSL_PARAM_locate_const(params, param_name);
*pp = NULL;
if (p == NULL)
return 1;
if (p->data_type != OSSL_PARAM_UNSIGNED_INTEGER
|| p->data_size != len)
return 0;
*pp = p->data;
return 1;
}
static int newreno_bind_diagnostic(OSSL_CC_DATA *cc, OSSL_PARAM *params)
{
OSSL_CC_NEWRENO *nr = (OSSL_CC_NEWRENO *)cc;
size_t *new_p_max_dgram_payload_len;
uint64_t *new_p_cur_cwnd_size;
uint64_t *new_p_min_cwnd_size;
uint64_t *new_p_cur_bytes_in_flight;
uint32_t *new_p_cur_state;
if (!bind_diag(params, OSSL_CC_OPTION_MAX_DGRAM_PAYLOAD_LEN,
sizeof(size_t), (void **)&new_p_max_dgram_payload_len)
|| !bind_diag(params, OSSL_CC_OPTION_CUR_CWND_SIZE,
sizeof(uint64_t), (void **)&new_p_cur_cwnd_size)
|| !bind_diag(params, OSSL_CC_OPTION_MIN_CWND_SIZE,
sizeof(uint64_t), (void **)&new_p_min_cwnd_size)
|| !bind_diag(params, OSSL_CC_OPTION_CUR_BYTES_IN_FLIGHT,
sizeof(uint64_t), (void **)&new_p_cur_bytes_in_flight)
|| !bind_diag(params, OSSL_CC_OPTION_CUR_STATE,
sizeof(uint32_t), (void **)&new_p_cur_state))
return 0;
if (new_p_max_dgram_payload_len != NULL)
nr->p_diag_max_dgram_payload_len = new_p_max_dgram_payload_len;
if (new_p_cur_cwnd_size != NULL)
nr->p_diag_cur_cwnd_size = new_p_cur_cwnd_size;
if (new_p_min_cwnd_size != NULL)
nr->p_diag_min_cwnd_size = new_p_min_cwnd_size;
if (new_p_cur_bytes_in_flight != NULL)
nr->p_diag_cur_bytes_in_flight = new_p_cur_bytes_in_flight;
if (new_p_cur_state != NULL)
nr->p_diag_cur_state = new_p_cur_state;
newreno_update_diag(nr);
return 1;
}
static void unbind_diag(OSSL_PARAM *params, const char *param_name,
void **pp)
{
const OSSL_PARAM *p = OSSL_PARAM_locate_const(params, param_name);
if (p != NULL)
*pp = NULL;
}
static int newreno_unbind_diagnostic(OSSL_CC_DATA *cc, OSSL_PARAM *params)
{
OSSL_CC_NEWRENO *nr = (OSSL_CC_NEWRENO *)cc;
unbind_diag(params, OSSL_CC_OPTION_MAX_DGRAM_PAYLOAD_LEN,
(void **)&nr->p_diag_max_dgram_payload_len);
unbind_diag(params, OSSL_CC_OPTION_CUR_CWND_SIZE,
(void **)&nr->p_diag_cur_cwnd_size);
unbind_diag(params, OSSL_CC_OPTION_MIN_CWND_SIZE,
(void **)&nr->p_diag_min_cwnd_size);
unbind_diag(params, OSSL_CC_OPTION_CUR_BYTES_IN_FLIGHT,
(void **)&nr->p_diag_cur_bytes_in_flight);
unbind_diag(params, OSSL_CC_OPTION_CUR_STATE,
(void **)&nr->p_diag_cur_state);
return 1;
}
static void newreno_update_diag(OSSL_CC_NEWRENO *nr)
{
if (nr->p_diag_max_dgram_payload_len != NULL)
*nr->p_diag_max_dgram_payload_len = nr->max_dgram_size;
if (nr->p_diag_cur_cwnd_size != NULL)
*nr->p_diag_cur_cwnd_size = nr->cong_wnd;
if (nr->p_diag_min_cwnd_size != NULL)
*nr->p_diag_min_cwnd_size = nr->k_min_wnd;
if (nr->
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