Mercurial > hg > nginx
view src/stream/ngx_stream_realip_module.c @ 9086:f68fdb017141 quic
QUIC: optimized sending stream response.
When a stream is created by client, it's often the case that nginx will send
immediate response on that stream. An example is HTTP/3 request stream, which
in most cases quickly replies with at least HTTP headers.
QUIC stream init handlers are called from a posted event. Output QUIC
frames are also sent to client from a posted event, called the push event.
If the push event is posted before the stream init event, then output produced
by stream may trigger sending an extra UDP datagram. To address this, push
event is now re-posted when a new stream init event is posted.
An example is handling 0-RTT packets. Client typically sends an init packet
coalesced with a 0-RTT packet. Previously, nginx replied with a padded CRYPTO
datagram, followed by a 1-RTT stream reply datagram. Now CRYPTO and STREAM
packets are coalesced in one reply datagram, which saves bandwidth.
Other examples include coalescing 1-RTT first stream response, and
MAX_STREAMS/STREAM sent in response to ACK/STREAM.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Mon, 03 Apr 2023 16:17:12 +0400 |
parents | 06b01840bd42 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_stream.h> typedef struct { ngx_array_t *from; /* array of ngx_cidr_t */ } ngx_stream_realip_srv_conf_t; typedef struct { struct sockaddr *sockaddr; socklen_t socklen; ngx_str_t addr_text; } ngx_stream_realip_ctx_t; static ngx_int_t ngx_stream_realip_handler(ngx_stream_session_t *s); static ngx_int_t ngx_stream_realip_set_addr(ngx_stream_session_t *s, ngx_addr_t *addr); static char *ngx_stream_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static void *ngx_stream_realip_create_srv_conf(ngx_conf_t *cf); static char *ngx_stream_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_int_t ngx_stream_realip_add_variables(ngx_conf_t *cf); static ngx_int_t ngx_stream_realip_init(ngx_conf_t *cf); static ngx_int_t ngx_stream_realip_remote_addr_variable(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data); static ngx_int_t ngx_stream_realip_remote_port_variable(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data); static ngx_command_t ngx_stream_realip_commands[] = { { ngx_string("set_real_ip_from"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_stream_realip_from, NGX_STREAM_SRV_CONF_OFFSET, 0, NULL }, ngx_null_command }; static ngx_stream_module_t ngx_stream_realip_module_ctx = { ngx_stream_realip_add_variables, /* preconfiguration */ ngx_stream_realip_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_stream_realip_create_srv_conf, /* create server configuration */ ngx_stream_realip_merge_srv_conf /* merge server configuration */ }; ngx_module_t ngx_stream_realip_module = { NGX_MODULE_V1, &ngx_stream_realip_module_ctx, /* module context */ ngx_stream_realip_commands, /* module directives */ NGX_STREAM_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_stream_variable_t ngx_stream_realip_vars[] = { { ngx_string("realip_remote_addr"), NULL, ngx_stream_realip_remote_addr_variable, 0, 0, 0 }, { ngx_string("realip_remote_port"), NULL, ngx_stream_realip_remote_port_variable, 0, 0, 0 }, ngx_stream_null_variable }; static ngx_int_t ngx_stream_realip_handler(ngx_stream_session_t *s) { ngx_addr_t addr; ngx_connection_t *c; ngx_stream_realip_srv_conf_t *rscf; rscf = ngx_stream_get_module_srv_conf(s, ngx_stream_realip_module); if (rscf->from == NULL) { return NGX_DECLINED; } c = s->connection; if (c->proxy_protocol == NULL) { return NGX_DECLINED; } if (ngx_cidr_match(c->sockaddr, rscf->from) != NGX_OK) { return NGX_DECLINED; } if (ngx_parse_addr(c->pool, &addr, c->proxy_protocol->src_addr.data, c->proxy_protocol->src_addr.len) != NGX_OK) { return NGX_DECLINED; } ngx_inet_set_port(addr.sockaddr, c->proxy_protocol->src_port); return ngx_stream_realip_set_addr(s, &addr); } static ngx_int_t ngx_stream_realip_set_addr(ngx_stream_session_t *s, ngx_addr_t *addr) { size_t len; u_char *p; u_char text[NGX_SOCKADDR_STRLEN]; ngx_connection_t *c; ngx_stream_realip_ctx_t *ctx; c = s->connection; ctx = ngx_palloc(c->pool, sizeof(ngx_stream_realip_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } len = ngx_sock_ntop(addr->sockaddr, addr->socklen, text, NGX_SOCKADDR_STRLEN, 0); if (len == 0) { return NGX_ERROR; } p = ngx_pnalloc(c->pool, len); if (p == NULL) { return NGX_ERROR; } ngx_memcpy(p, text, len); ngx_stream_set_ctx(s, ctx, ngx_stream_realip_module); ctx->sockaddr = c->sockaddr; ctx->socklen = c->socklen; ctx->addr_text = c->addr_text; c->sockaddr = addr->sockaddr; c->socklen = addr->socklen; c->addr_text.len = len; c->addr_text.data = p; return NGX_DECLINED; } static char * ngx_stream_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_stream_realip_srv_conf_t *rscf = conf; ngx_int_t rc; ngx_str_t *value; ngx_url_t u; ngx_cidr_t c, *cidr; ngx_uint_t i; struct sockaddr_in *sin; #if (NGX_HAVE_INET6) struct sockaddr_in6 *sin6; #endif value = cf->args->elts; if (rscf->from == NULL) { rscf->from = ngx_array_create(cf->pool, 2, sizeof(ngx_cidr_t)); if (rscf->from == NULL) { return NGX_CONF_ERROR; } } #if (NGX_HAVE_UNIX_DOMAIN) if (ngx_strcmp(value[1].data, "unix:") == 0) { cidr = ngx_array_push(rscf->from); if (cidr == NULL) { return NGX_CONF_ERROR; } cidr->family = AF_UNIX; return NGX_CONF_OK; } #endif rc = ngx_ptocidr(&value[1], &c); if (rc != NGX_ERROR) { if (rc == NGX_DONE) { ngx_conf_log_error(NGX_LOG_WARN, cf, 0, "low address bits of %V are meaningless", &value[1]); } cidr = ngx_array_push(rscf->from); if (cidr == NULL) { return NGX_CONF_ERROR; } *cidr = c; return NGX_CONF_OK; } ngx_memzero(&u, sizeof(ngx_url_t)); u.host = value[1]; if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) { if (u.err) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s in set_real_ip_from \"%V\"", u.err, &u.host); } return NGX_CONF_ERROR; } cidr = ngx_array_push_n(rscf->from, u.naddrs); if (cidr == NULL) { return NGX_CONF_ERROR; } ngx_memzero(cidr, u.naddrs * sizeof(ngx_cidr_t)); for (i = 0; i < u.naddrs; i++) { cidr[i].family = u.addrs[i].sockaddr->sa_family; switch (cidr[i].family) { #if (NGX_HAVE_INET6) case AF_INET6: sin6 = (struct sockaddr_in6 *) u.addrs[i].sockaddr; cidr[i].u.in6.addr = sin6->sin6_addr; ngx_memset(cidr[i].u.in6.mask.s6_addr, 0xff, 16); break; #endif default: /* AF_INET */ sin = (struct sockaddr_in *) u.addrs[i].sockaddr; cidr[i].u.in.addr = sin->sin_addr.s_addr; cidr[i].u.in.mask = 0xffffffff; break; } } return NGX_CONF_OK; } static void * ngx_stream_realip_create_srv_conf(ngx_conf_t *cf) { ngx_stream_realip_srv_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_realip_srv_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->from = NULL; */ return conf; } static char * ngx_stream_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_stream_realip_srv_conf_t *prev = parent; ngx_stream_realip_srv_conf_t *conf = child; if (conf->from == NULL) { conf->from = prev->from; } return NGX_CONF_OK; } static ngx_int_t ngx_stream_realip_add_variables(ngx_conf_t *cf) { ngx_stream_variable_t *var, *v; for (v = ngx_stream_realip_vars; v->name.len; v++) { var = ngx_stream_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 ngx_int_t ngx_stream_realip_init(ngx_conf_t *cf) { ngx_stream_handler_pt *h; ngx_stream_core_main_conf_t *cmcf; cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module); h = ngx_array_push(&cmcf->phases[NGX_STREAM_POST_ACCEPT_PHASE].handlers); if (h == NULL) { return NGX_ERROR; } *h = ngx_stream_realip_handler; return NGX_OK; } static ngx_int_t ngx_stream_realip_remote_addr_variable(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data) { ngx_str_t *addr_text; ngx_stream_realip_ctx_t *ctx; ctx = ngx_stream_get_module_ctx(s, ngx_stream_realip_module); addr_text = ctx ? &ctx->addr_text : &s->connection->addr_text; v->len = addr_text->len; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; v->data = addr_text->data; return NGX_OK; } static ngx_int_t ngx_stream_realip_remote_port_variable(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data) { ngx_uint_t port; struct sockaddr *sa; ngx_stream_realip_ctx_t *ctx; ctx = ngx_stream_get_module_ctx(s, ngx_stream_realip_module); sa = ctx ? ctx->sockaddr : s->connection->sockaddr; v->len = 0; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; v->data = ngx_pnalloc(s->connection->pool, sizeof("65535") - 1); if (v->data == NULL) { return NGX_ERROR; } port = ngx_inet_get_port(sa); if (port > 0 && port < 65536) { v->len = ngx_sprintf(v->data, "%ui", port) - v->data; } return NGX_OK; }