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/*
* include/proto/quic_loss.h
* This file provides interface definition for QUIC loss detection.
*
* Copyright 2019 HAProxy Technologies, Frederic Lecaille <flecaille@haproxy.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _PROTO_QUIC_LOSS_H
#define _PROTO_QUIC_LOSS_H
#ifdef USE_QUIC
#ifndef USE_OPENSSL
#error "Must define USE_OPENSSL"
#endif
#include <haproxy/quic_loss-t.h>
#include <haproxy/api.h>
#include <haproxy/quic_conn-t.h>
#include <haproxy/quic_tls-t.h>
static inline void quic_loss_init(struct quic_loss *ql)
{
ql->srtt = QUIC_LOSS_INITIAL_RTT << 3;
ql->rtt_var = (QUIC_LOSS_INITIAL_RTT >> 1) << 2;
ql->rtt_min = 0;
ql->pto_count = 0;
}
/* Return 1 if a persitent congestion is observed for a list of
* lost packets sent during <period> period depending on <ql> loss information,
* <now_us> the current time and <max_ack_delay_us> the maximum ACK delay of the connection
* experiencing a packet loss. Return 0 on the contrary.
*/
static inline int quic_loss_persistent_congestion(struct quic_loss *ql,
unsigned int period,
unsigned int now_us,
unsigned int max_ack_delay)
{
unsigned int congestion_period;
if (!period)
return 0;
congestion_period = (ql->srtt >> 3) +
QUIC_MAX(ql->rtt_var, QUIC_TIMER_GRANULARITY) + max_ack_delay;
congestion_period *= QUIC_LOSS_PACKET_THRESHOLD;
return period >= congestion_period;
}
/* Return the PTO associated to <pktns> packet number space for <qc> connection */
static inline unsigned int quic_pto(struct quic_conn *qc)
{
struct quic_loss *ql = &qc->path->loss;
return (ql->srtt >> 3) + QUIC_MAX(ql->rtt_var, QUIC_TIMER_GRANULARITY) +
(HA_ATOMIC_LOAD(&qc->state) >= QUIC_HS_ST_COMPLETE ? qc->max_ack_delay : 0);
}
void quic_loss_srtt_update(struct quic_loss *ql,
unsigned int rtt, unsigned int ack_delay,
struct quic_conn *qc);
struct quic_pktns *quic_loss_pktns(struct quic_conn *qc);
struct quic_pktns *quic_pto_pktns(struct quic_conn *qc,
int handshake_completed,
unsigned int *pto);
void qc_packet_loss_lookup(struct quic_pktns *pktns, struct quic_conn *qc,
struct list *lost_pkts);
#endif /* USE_QUIC */
#endif /* _PROTO_QUIC_LOSS_H */
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