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92fa63f735
xprt_quic module was too large and did not reflect the true architecture by contrast to the other protocols in haproxy. Extract code related to XPRT layer and keep it under xprt_quic module. This code should only contains a simple API to communicate between QUIC lower layer and connection/MUX. The vast majority of the code has been moved into a new module named quic_conn. This module is responsible to the implementation of QUIC lower layer. Conceptually, it overlaps with TCP kernel implementation when comparing QUIC and HTTP1/2 stacks of haproxy. This should be backported up to 2.6.
88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
/*
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* include/proto/quic_loss.h
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* This file provides interface definition for QUIC loss detection.
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*
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* Copyright 2019 HAProxy Technologies, Frederic Lecaille <flecaille@haproxy.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_QUIC_LOSS_H
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#define _PROTO_QUIC_LOSS_H
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#ifdef USE_QUIC
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#ifndef USE_OPENSSL
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#error "Must define USE_OPENSSL"
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#endif
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#include <haproxy/quic_loss-t.h>
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#include <haproxy/api.h>
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#include <haproxy/quic_conn-t.h>
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#include <haproxy/quic_tls-t.h>
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static inline void quic_loss_init(struct quic_loss *ql)
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{
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ql->srtt = QUIC_LOSS_INITIAL_RTT << 3;
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ql->rtt_var = (QUIC_LOSS_INITIAL_RTT >> 1) << 2;
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ql->rtt_min = 0;
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ql->pto_count = 0;
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}
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/* Return 1 if a persitent congestion is observed for a list of
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* lost packets sent during <period> period depending on <ql> loss information,
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* <now_us> the current time and <max_ack_delay_us> the maximum ACK delay of the connection
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* experiencing a packet loss. Return 0 on the contrary.
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*/
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static inline int quic_loss_persistent_congestion(struct quic_loss *ql,
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unsigned int period,
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unsigned int now_us,
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unsigned int max_ack_delay)
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{
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unsigned int congestion_period;
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if (!period)
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return 0;
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congestion_period = (ql->srtt >> 3) +
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QUIC_MAX(ql->rtt_var, QUIC_TIMER_GRANULARITY) + max_ack_delay;
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congestion_period *= QUIC_LOSS_PACKET_THRESHOLD;
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return period >= congestion_period;
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}
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/* Return the PTO associated to <pktns> packet number space for <qc> connection */
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static inline unsigned int quic_pto(struct quic_conn *qc)
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{
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struct quic_loss *ql = &qc->path->loss;
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return (ql->srtt >> 3) + QUIC_MAX(ql->rtt_var, QUIC_TIMER_GRANULARITY) +
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(HA_ATOMIC_LOAD(&qc->state) >= QUIC_HS_ST_COMPLETE ? qc->max_ack_delay : 0);
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}
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void quic_loss_srtt_update(struct quic_loss *ql,
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unsigned int rtt, unsigned int ack_delay,
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struct quic_conn *qc);
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struct quic_pktns *quic_loss_pktns(struct quic_conn *qc);
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struct quic_pktns *quic_pto_pktns(struct quic_conn *qc,
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int handshake_completed,
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unsigned int *pto);
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void qc_packet_loss_lookup(struct quic_pktns *pktns, struct quic_conn *qc,
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struct list *lost_pkts);
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#endif /* USE_QUIC */
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#endif /* _PROTO_QUIC_LOSS_H */
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