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view src/stream/ngx_stream_quic_module.c @ 8442:b3f6ad181df4 quic

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QUIC: refactored CRYPTO and STREAM buffer ordering. Generic function ngx_quic_order_bufs() is introduced. This function creates and maintains a chain of buffers with holes. Holes are marked with b->sync flag. Several buffers and holes in this chain may share the same underlying memory buffer. When processing STREAM frames with this function, frame data is copied only once to the right place in the stream input chain. Previously data could be copied twice. First when buffering an out-of-order frame data, and then when filling stream buffer from ordered frame queue. Now there's only one data chain for both tasks.
author Roman Arutyunyan <arut@nginx.com>
date Tue, 25 May 2021 13:55:12 +0300
parents b4e6b7049984
children f8ad3dd142ad
line wrap: on
line source


/*
 * Copyright (C) Nginx, Inc.
 * Copyright (C) Roman Arutyunyan
 */


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


static ngx_int_t ngx_stream_variable_quic(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_quic_add_variables(ngx_conf_t *cf);
static void *ngx_stream_quic_create_srv_conf(ngx_conf_t *cf);
static char *ngx_stream_quic_merge_srv_conf(ngx_conf_t *cf, void *parent,
    void *child);
static char *ngx_stream_quic_max_ack_delay(ngx_conf_t *cf, void *post,
    void *data);
static char *ngx_stream_quic_max_udp_payload_size(ngx_conf_t *cf, void *post,
    void *data);
static char *ngx_stream_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);


static ngx_conf_post_t  ngx_stream_quic_max_ack_delay_post =
    { ngx_stream_quic_max_ack_delay };
static ngx_conf_post_t  ngx_stream_quic_max_udp_payload_size_post =
    { ngx_stream_quic_max_udp_payload_size };
static ngx_conf_num_bounds_t  ngx_stream_quic_ack_delay_exponent_bounds =
    { ngx_conf_check_num_bounds, 0, 20 };
static ngx_conf_num_bounds_t
                            ngx_stream_quic_active_connection_id_limit_bounds =
    { ngx_conf_check_num_bounds, 2, -1 };


static ngx_command_t  ngx_stream_quic_commands[] = {

    { ngx_string("quic_max_idle_timeout"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.max_idle_timeout),
      NULL },

    { ngx_string("quic_max_ack_delay"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.max_ack_delay),
      &ngx_stream_quic_max_ack_delay_post },

    { ngx_string("quic_max_udp_payload_size"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.max_udp_payload_size),
      &ngx_stream_quic_max_udp_payload_size_post },

    { ngx_string("quic_initial_max_data"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.initial_max_data),
      NULL },

    { ngx_string("quic_initial_max_stream_data_bidi_local"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.initial_max_stream_data_bidi_local),
      NULL },

    { ngx_string("quic_initial_max_stream_data_bidi_remote"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.initial_max_stream_data_bidi_remote),
      NULL },

    { ngx_string("quic_initial_max_stream_data_uni"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.initial_max_stream_data_uni),
      NULL },

    { ngx_string("quic_initial_max_streams_bidi"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.initial_max_streams_bidi),
      NULL },

    { ngx_string("quic_initial_max_streams_uni"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.initial_max_streams_uni),
      NULL },

    { ngx_string("quic_ack_delay_exponent"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.ack_delay_exponent),
      &ngx_stream_quic_ack_delay_exponent_bounds },

    { ngx_string("quic_disable_active_migration"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_flag_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.disable_active_migration),
      NULL },

    { ngx_string("quic_active_connection_id_limit"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, tp.active_connection_id_limit),
      &ngx_stream_quic_active_connection_id_limit_bounds },

    { ngx_string("quic_retry"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_FLAG,
      ngx_conf_set_flag_slot,
      NGX_STREAM_SRV_CONF_OFFSET,
      offsetof(ngx_quic_conf_t, retry),
      NULL },

    { ngx_string("quic_host_key"),
      NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_FLAG,
      ngx_stream_quic_host_key,
      NGX_STREAM_SRV_CONF_OFFSET,
      0,
      NULL },

      ngx_null_command
};


static ngx_stream_module_t  ngx_stream_quic_module_ctx = {
    ngx_stream_quic_add_variables,         /* preconfiguration */
    NULL,                                  /* postconfiguration */

    NULL,                                  /* create main configuration */
    NULL,                                  /* init main configuration */

    ngx_stream_quic_create_srv_conf,       /* create server configuration */
    ngx_stream_quic_merge_srv_conf,        /* merge server configuration */
};


ngx_module_t  ngx_stream_quic_module = {
    NGX_MODULE_V1,
    &ngx_stream_quic_module_ctx,           /* module context */
    ngx_stream_quic_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_quic_vars[] = {

    { ngx_string("quic"), NULL, ngx_stream_variable_quic, 0, 0, 0 },

      ngx_stream_null_variable
};

static ngx_str_t  ngx_stream_quic_salt = ngx_string("ngx_quic");


static ngx_int_t
ngx_stream_variable_quic(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    if (s->connection->quic) {

        v->len = 4;
        v->valid = 1;
        v->no_cacheable = 1;
        v->not_found = 0;
        v->data = (u_char *) "quic";
        return NGX_OK;
    }

    v->not_found = 1;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_quic_add_variables(ngx_conf_t *cf)
{
    ngx_stream_variable_t  *var, *v;

    for (v = ngx_stream_quic_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 void *
ngx_stream_quic_create_srv_conf(ngx_conf_t *cf)
{
    ngx_quic_conf_t  *conf;

    conf = ngx_pcalloc(cf->pool, sizeof(ngx_quic_conf_t));
    if (conf == NULL) {
        return NULL;
    }

    /*
     * set by ngx_pcalloc():
     *
     *     conf->tp.original_dcid = { 0, NULL };
     *     conf->tp.initial_scid = { 0, NULL };
     *     conf->tp.retry_scid = { 0, NULL };
     *     conf->tp.preferred_address = NULL
     *     conf->host_key = { 0, NULL }
     *     conf->require_alpn = 0;
     */

    conf->tp.max_idle_timeout = NGX_CONF_UNSET_MSEC;
    conf->tp.max_ack_delay = NGX_CONF_UNSET_MSEC;
    conf->tp.max_udp_payload_size = NGX_CONF_UNSET_SIZE;
    conf->tp.initial_max_data = NGX_CONF_UNSET_SIZE;
    conf->tp.initial_max_stream_data_bidi_local = NGX_CONF_UNSET_SIZE;
    conf->tp.initial_max_stream_data_bidi_remote = NGX_CONF_UNSET_SIZE;
    conf->tp.initial_max_stream_data_uni = NGX_CONF_UNSET_SIZE;
    conf->tp.initial_max_streams_bidi = NGX_CONF_UNSET_UINT;
    conf->tp.initial_max_streams_uni = NGX_CONF_UNSET_UINT;
    conf->tp.ack_delay_exponent = NGX_CONF_UNSET_UINT;
    conf->tp.disable_active_migration = NGX_CONF_UNSET;
    conf->tp.active_connection_id_limit = NGX_CONF_UNSET_UINT;

    conf->retry = NGX_CONF_UNSET;

    return conf;
}


static char *
ngx_stream_quic_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_quic_conf_t *prev = parent;
    ngx_quic_conf_t *conf = child;

    ngx_stream_ssl_conf_t  *scf;

    ngx_conf_merge_msec_value(conf->tp.max_idle_timeout,
                              prev->tp.max_idle_timeout, 60000);

    ngx_conf_merge_msec_value(conf->tp.max_ack_delay,
                              prev->tp.max_ack_delay,
                              NGX_QUIC_DEFAULT_MAX_ACK_DELAY);

    ngx_conf_merge_size_value(conf->tp.max_udp_payload_size,
                              prev->tp.max_udp_payload_size,
                              NGX_QUIC_MAX_UDP_PAYLOAD_SIZE);

    ngx_conf_merge_size_value(conf->tp.initial_max_data,
                              prev->tp.initial_max_data,
                              16 * NGX_QUIC_STREAM_BUFSIZE);

    ngx_conf_merge_size_value(conf->tp.initial_max_stream_data_bidi_local,
                              prev->tp.initial_max_stream_data_bidi_local,
                              NGX_QUIC_STREAM_BUFSIZE);

    ngx_conf_merge_size_value(conf->tp.initial_max_stream_data_bidi_remote,
                              prev->tp.initial_max_stream_data_bidi_remote,
                              NGX_QUIC_STREAM_BUFSIZE);

    ngx_conf_merge_size_value(conf->tp.initial_max_stream_data_uni,
                              prev->tp.initial_max_stream_data_uni,
                              NGX_QUIC_STREAM_BUFSIZE);

    ngx_conf_merge_uint_value(conf->tp.initial_max_streams_bidi,
                              prev->tp.initial_max_streams_bidi, 16);

    ngx_conf_merge_uint_value(conf->tp.initial_max_streams_uni,
                              prev->tp.initial_max_streams_uni, 16);

    ngx_conf_merge_uint_value(conf->tp.ack_delay_exponent,
                              prev->tp.ack_delay_exponent,
                              NGX_QUIC_DEFAULT_ACK_DELAY_EXPONENT);

    ngx_conf_merge_value(conf->tp.disable_active_migration,
                              prev->tp.disable_active_migration, 0);

    ngx_conf_merge_uint_value(conf->tp.active_connection_id_limit,
                              prev->tp.active_connection_id_limit, 2);

    ngx_conf_merge_value(conf->retry, prev->retry, 0);

    ngx_conf_merge_str_value(conf->host_key, prev->host_key, "");

    if (conf->host_key.len == 0) {

        conf->host_key.len = NGX_QUIC_DEFAULT_HOST_KEY_LEN;
        conf->host_key.data = ngx_palloc(cf->pool, conf->host_key.len);
        if (conf->host_key.data == NULL) {
            return NGX_CONF_ERROR;
        }

        if (RAND_bytes(conf->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->host_key, &ngx_stream_quic_salt,
                            conf->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->host_key, &ngx_stream_quic_salt,
                            conf->sr_token_key, NGX_QUIC_SR_KEY_LEN)
        != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    scf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_ssl_module);
    conf->ssl = &scf->ssl;

    return NGX_CONF_OK;
}


static char *
ngx_stream_quic_max_ack_delay(ngx_conf_t *cf, void *post, void *data)
{
    ngx_msec_t *sp = data;

    if (*sp > 16384) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "\"quic_max_ack_delay\" must be less than 16384");

        return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
}


static char *
ngx_stream_quic_max_udp_payload_size(ngx_conf_t *cf, void *post, void *data)
{
    size_t *sp = data;

    if (*sp < NGX_QUIC_MIN_INITIAL_SIZE
        || *sp > NGX_QUIC_MAX_UDP_PAYLOAD_SIZE)
    {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "\"quic_max_udp_payload_size\" must be between "
                           "%d and %d",
                           NGX_QUIC_MIN_INITIAL_SIZE,
                           NGX_QUIC_MAX_UDP_PAYLOAD_SIZE);

        return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
}


static char *
ngx_stream_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_quic_conf_t  *qcf = conf;

    u_char           *buf;
    size_t            size;
    ssize_t           n;
    ngx_str_t        *value;
    ngx_file_t        file;
    ngx_file_info_t   fi;

    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;
}