Mercurial > hg > nginx
view src/http/v3/ngx_http_v3_module.c @ 9138:a90f79792b5d
QUIC: optimized ACK delay.
Previously ACK was not generated if max_ack_delay was not yet expired and the
number of unacknowledged ack-eliciting packets was less than two, as allowed by
RFC 9000 13.2.1-13.2.2. However this only makes sense to avoid sending ACK-only
packets, as explained by the RFC:
On the other hand, reducing the frequency of packets that carry only
acknowledgments reduces packet transmission and processing cost at both
endpoints.
Now ACK is delayed only if output frame queue is empty. Otherwise ACK is sent
immediately, which significantly improves QUIC performance with certain tests.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Thu, 27 Jul 2023 16:37:17 +0400 |
parents | f742b1b46901 |
children | ad3d34ddfdcc |
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/* * Copyright (C) Nginx, Inc. * Copyright (C) Roman Arutyunyan */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> static ngx_int_t ngx_http_v3_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); static ngx_int_t ngx_http_v3_add_variables(ngx_conf_t *cf); static void *ngx_http_v3_create_srv_conf(ngx_conf_t *cf); static char *ngx_http_v3_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_http_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_command_t ngx_http_v3_commands[] = { { ngx_string("http3"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_SRV_CONF_OFFSET, offsetof(ngx_http_v3_srv_conf_t, enable), NULL }, { ngx_string("http3_hq"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_SRV_CONF_OFFSET, offsetof(ngx_http_v3_srv_conf_t, enable_hq), NULL }, { ngx_string("http3_max_concurrent_streams"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_HTTP_SRV_CONF_OFFSET, offsetof(ngx_http_v3_srv_conf_t, max_concurrent_streams), NULL }, { ngx_string("http3_stream_buffer_size"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_size_slot, NGX_HTTP_SRV_CONF_OFFSET, offsetof(ngx_http_v3_srv_conf_t, quic.stream_buffer_size), NULL }, { ngx_string("quic_retry"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_SRV_CONF_OFFSET, offsetof(ngx_http_v3_srv_conf_t, quic.retry), NULL }, { ngx_string("quic_gso"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_SRV_CONF_OFFSET, offsetof(ngx_http_v3_srv_conf_t, quic.gso_enabled), NULL }, { ngx_string("quic_host_key"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1, ngx_http_quic_host_key, NGX_HTTP_SRV_CONF_OFFSET, 0, NULL }, { ngx_string("quic_active_connection_id_limit"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1, ngx_conf_set_num_slot, NGX_HTTP_SRV_CONF_OFFSET, offsetof(ngx_http_v3_srv_conf_t, quic.active_connection_id_limit), NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_v3_module_ctx = { ngx_http_v3_add_variables, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_http_v3_create_srv_conf, /* create server configuration */ ngx_http_v3_merge_srv_conf, /* merge server configuration */ NULL, /* create location configuration */ NULL /* merge location configuration */ }; ngx_module_t ngx_http_v3_module = { NGX_MODULE_V1, &ngx_http_v3_module_ctx, /* module context */ ngx_http_v3_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_http_variable_t ngx_http_v3_vars[] = { { ngx_string("http3"), NULL, ngx_http_v3_variable, 0, 0, 0 }, ngx_http_null_variable }; static ngx_str_t ngx_http_quic_salt = ngx_string("ngx_quic"); static ngx_int_t ngx_http_v3_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) { ngx_http_v3_session_t *h3c; if (r->connection->quic) { h3c = ngx_http_v3_get_session(r->connection); if (h3c->hq) { v->len = sizeof("hq") - 1; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; v->data = (u_char *) "hq"; return NGX_OK; } v->len = sizeof("h3") - 1; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; v->data = (u_char *) "h3"; return NGX_OK; } *v = ngx_http_variable_null_value; return NGX_OK; } static ngx_int_t ngx_http_v3_add_variables(ngx_conf_t *cf) { ngx_http_variable_t *var, *v; for (v = ngx_http_v3_vars; v->name.len; v++) { var = ngx_http_add_variable(cf, &v->name, v->flags); if (var == NULL) { return NGX_ERROR; } var->get_handler = v->get_handler; var->data = v->data; } return NGX_OK; } static void * ngx_http_v3_create_srv_conf(ngx_conf_t *cf) { ngx_http_v3_srv_conf_t *h3scf; h3scf = ngx_pcalloc(cf->pool, sizeof(ngx_http_v3_srv_conf_t)); if (h3scf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * h3scf->quic.host_key = { 0, NULL } * h3scf->quic.stream_reject_code_uni = 0; * h3scf->quic.disable_active_migration = 0; * h3scf->quic.timeout = 0; * h3scf->max_blocked_streams = 0; */ h3scf->enable = NGX_CONF_UNSET; h3scf->enable_hq = NGX_CONF_UNSET; h3scf->max_table_capacity = NGX_HTTP_V3_MAX_TABLE_CAPACITY; h3scf->max_concurrent_streams = NGX_CONF_UNSET_UINT; h3scf->quic.stream_buffer_size = NGX_CONF_UNSET_SIZE; h3scf->quic.max_concurrent_streams_bidi = NGX_CONF_UNSET_UINT; h3scf->quic.max_concurrent_streams_uni = NGX_HTTP_V3_MAX_UNI_STREAMS; h3scf->quic.retry = NGX_CONF_UNSET; h3scf->quic.gso_enabled = NGX_CONF_UNSET; h3scf->quic.stream_close_code = NGX_HTTP_V3_ERR_NO_ERROR; h3scf->quic.stream_reject_code_bidi = NGX_HTTP_V3_ERR_REQUEST_REJECTED; h3scf->quic.active_connection_id_limit = NGX_CONF_UNSET_UINT; h3scf->quic.init = ngx_http_v3_init; h3scf->quic.shutdown = ngx_http_v3_shutdown; return h3scf; } static char * ngx_http_v3_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_v3_srv_conf_t *prev = parent; ngx_http_v3_srv_conf_t *conf = child; ngx_http_ssl_srv_conf_t *sscf; ngx_conf_merge_value(conf->enable, prev->enable, 1); ngx_conf_merge_value(conf->enable_hq, prev->enable_hq, 0); ngx_conf_merge_uint_value(conf->max_concurrent_streams, prev->max_concurrent_streams, 128); conf->max_blocked_streams = conf->max_concurrent_streams; ngx_conf_merge_size_value(conf->quic.stream_buffer_size, prev->quic.stream_buffer_size, 65536); conf->quic.max_concurrent_streams_bidi = conf->max_concurrent_streams; ngx_conf_merge_value(conf->quic.retry, prev->quic.retry, 0); ngx_conf_merge_value(conf->quic.gso_enabled, prev->quic.gso_enabled, 0); ngx_conf_merge_str_value(conf->quic.host_key, prev->quic.host_key, ""); ngx_conf_merge_uint_value(conf->quic.active_connection_id_limit, prev->quic.active_connection_id_limit, 2); if (conf->quic.host_key.len == 0) { conf->quic.host_key.len = NGX_QUIC_DEFAULT_HOST_KEY_LEN; conf->quic.host_key.data = ngx_palloc(cf->pool, conf->quic.host_key.len); if (conf->quic.host_key.data == NULL) { return NGX_CONF_ERROR; } if (RAND_bytes(conf->quic.host_key.data, NGX_QUIC_DEFAULT_HOST_KEY_LEN) <= 0) { return NGX_CONF_ERROR; } } if (ngx_quic_derive_key(cf->log, "av_token_key", &conf->quic.host_key, &ngx_http_quic_salt, conf->quic.av_token_key, NGX_QUIC_AV_KEY_LEN) != NGX_OK) { return NGX_CONF_ERROR; } if (ngx_quic_derive_key(cf->log, "sr_token_key", &conf->quic.host_key, &ngx_http_quic_salt, conf->quic.sr_token_key, NGX_QUIC_SR_KEY_LEN) != NGX_OK) { return NGX_CONF_ERROR; } sscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_ssl_module); conf->quic.ssl = &sscf->ssl; return NGX_CONF_OK; } static char * ngx_http_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_v3_srv_conf_t *h3scf = conf; u_char *buf; size_t size; ssize_t n; ngx_str_t *value; ngx_file_t file; ngx_file_info_t fi; ngx_quic_conf_t *qcf; qcf = &h3scf->quic; if (qcf->host_key.len) { return "is duplicate"; } buf = NULL; #if (NGX_SUPPRESS_WARN) size = 0; #endif value = cf->args->elts; if (ngx_conf_full_name(cf->cycle, &value[1], 1) != NGX_OK) { return NGX_CONF_ERROR; } ngx_memzero(&file, sizeof(ngx_file_t)); file.name = value[1]; file.log = cf->log; file.fd = ngx_open_file(file.name.data, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0); if (file.fd == NGX_INVALID_FILE) { ngx_conf_log_error(NGX_LOG_EMERG, cf, ngx_errno, ngx_open_file_n " \"%V\" failed", &file.name); return NGX_CONF_ERROR; } if (ngx_fd_info(file.fd, &fi) == NGX_FILE_ERROR) { ngx_conf_log_error(NGX_LOG_CRIT, cf, ngx_errno, ngx_fd_info_n " \"%V\" failed", &file.name); goto failed; } size = ngx_file_size(&fi); if (size == 0) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"%V\" zero key size", &file.name); goto failed; } buf = ngx_pnalloc(cf->pool, size); if (buf == NULL) { goto failed; } n = ngx_read_file(&file, buf, size, 0); if (n == NGX_ERROR) { ngx_conf_log_error(NGX_LOG_CRIT, cf, ngx_errno, ngx_read_file_n " \"%V\" failed", &file.name); goto failed; } if ((size_t) n != size) { ngx_conf_log_error(NGX_LOG_CRIT, cf, 0, ngx_read_file_n " \"%V\" returned only " "%z bytes instead of %uz", &file.name, n, size); goto failed; } qcf->host_key.data = buf; qcf->host_key.len = n; if (ngx_close_file(file.fd) == NGX_FILE_ERROR) { ngx_log_error(NGX_LOG_ALERT, cf->log, ngx_errno, ngx_close_file_n " \"%V\" failed", &file.name); } return NGX_CONF_OK; failed: if (ngx_close_file(file.fd) == NGX_FILE_ERROR) { ngx_log_error(NGX_LOG_ALERT, cf->log, ngx_errno, ngx_close_file_n " \"%V\" failed", &file.name); } if (buf) { ngx_explicit_memzero(buf, size); } return NGX_CONF_ERROR; }