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view src/event/quic/ngx_event_quic_migration.h @ 9143:48691bab4474

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QUIC: fixed probe-congestion deadlock. When probe timeout expired while congestion window was exhausted, probe PINGs could not be sent. As a result, lost packets could not be declared lost and congestion window could not be freed for new packets. This deadlock continued until connection idle timeout expiration. Now PINGs are sent separately from the frame queue without congestion control, as specified by RFC 9002, Section 7: An endpoint MUST NOT send a packet if it would cause bytes_in_flight (see Appendix B.2) to be larger than the congestion window, unless the packet is sent on a PTO timer expiration (see Section 6.2) or when entering recovery (see Section 7.3.2).
author Roman Arutyunyan <arut@nginx.com>
date Mon, 14 Aug 2023 08:28:30 +0400
parents fab36e4abf83
children bba136612fe4
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/*
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_EVENT_QUIC_MIGRATION_H_INCLUDED_
#define _NGX_EVENT_QUIC_MIGRATION_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>

#define NGX_QUIC_PATH_RETRIES   3

#define NGX_QUIC_PATH_PROBE     0
#define NGX_QUIC_PATH_ACTIVE    1
#define NGX_QUIC_PATH_BACKUP    2

#define ngx_quic_path_dbg(c, msg, path)                                       \
    ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0,                            \
                   "quic path seq:%uL %s sent:%O recvd:%O state:%s%s%s",      \
                   path->seqnum, msg, path->sent, path->received,             \
                   path->limited ? "L" : "", path->validated ? "V": "N",      \
                   path->validating ? "R": "");

ngx_int_t ngx_quic_handle_path_challenge_frame(ngx_connection_t *c,
    ngx_quic_header_t *pkt, ngx_quic_path_challenge_frame_t *f);
ngx_int_t ngx_quic_handle_path_response_frame(ngx_connection_t *c,
    ngx_quic_path_challenge_frame_t *f);

ngx_quic_path_t *ngx_quic_new_path(ngx_connection_t *c,
    struct sockaddr *sockaddr, socklen_t socklen, ngx_quic_client_id_t *cid);
ngx_int_t ngx_quic_free_path(ngx_connection_t *c, ngx_quic_path_t *path);

ngx_int_t ngx_quic_set_path(ngx_connection_t *c, ngx_quic_header_t *pkt);
ngx_int_t ngx_quic_handle_migration(ngx_connection_t *c,
    ngx_quic_header_t *pkt);

void ngx_quic_path_validation_handler(ngx_event_t *ev);

#endif /* _NGX_EVENT_QUIC_MIGRATION_H_INCLUDED_ */