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annotate README @ 9091:8f2f40d3fd18 quic

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QUIC: fixed split frames error handling. Do not corrupt frame data chain pointer on ngx_quic_read_buffer() error. The error leads to closing a QUIC connection where the frame may be used as part of the QUIC connection tear down, which envolves writing pending frames, including this one.
author Sergey Kandaurov <pluknet@nginx.com>
date Thu, 04 May 2023 15:52:23 +0400
parents 8347620e0e76
children b9230e37b8a1
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1 Experimental QUIC support for nginx
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2 -----------------------------------
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3
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4 1. Introduction
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5 2. Building from sources
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6 3. Configuration
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7 4. Directives
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8 5. Clients
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9 6. Troubleshooting
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10 7. Contributing
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11 8. Links
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12
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13 1. Introduction
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14
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15 This is an experimental QUIC [1] / HTTP/3 [2] support for nginx.
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16
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17 The code is developed in a separate "quic" branch available
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18 at https://hg.nginx.org/nginx-quic. Currently it is based
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19 on nginx mainline 1.23.x. We merge new nginx releases into
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20 this branch regularly.
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21
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22 The project code base is under the same BSD license as nginx.
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23
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24 The code is currently at a beta level of quality, however
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25 there are several production deployments with it.
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26
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27 NGINX Development Team is working on improving HTTP/3 support to
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28 integrate it into the main NGINX codebase. Thus, expect further
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29 updates of this code, including features, changes in behaviour,
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30 bug fixes, and refactoring. NGINX Development team will be
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31 grateful for any feedback and code submissions.
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32
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33 Please contact NGINX Development Team via nginx-devel mailing list [3].
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34
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35 What works now:
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36
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37 IETF QUIC version 1 is supported. Internet drafts are no longer supported.
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38
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39 nginx should be able to respond to HTTP/3 requests over QUIC and
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40 it should be possible to upload and download big files without errors.
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41
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42 + The handshake completes successfully
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43 + One endpoint can update keys and its peer responds correctly
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44 + 0-RTT data is being received and acted on
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45 + Connection is established using TLS Resume Ticket
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46 + A handshake that includes a Retry packet completes successfully
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47 + Stream data is being exchanged and ACK'ed
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48 + An H3 transaction succeeded
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49 + One or both endpoints insert entries into dynamic table and
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50 subsequently reference them from header blocks
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51 + Version Negotiation packet is sent to client with unknown version
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52 + Lost packets are detected and retransmitted properly
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53 + Clients may migrate to new address
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54
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55 2. Building from sources
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56
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57 The build is configured using the configure command.
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58 Refer to http://nginx.org/en/docs/configure.html for details.
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59
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60 When configuring nginx, it's possible to enable QUIC and HTTP/3
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61 using the following new configuration options:
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62
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63 --with-http_v3_module - enable QUIC and HTTP/3
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64 --with-stream_quic_module - enable QUIC in Stream
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65
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66 A library that provides QUIC support is recommended to build nginx, there
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67 are several of those available on the market:
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68 + BoringSSL [4]
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69 + LibreSSL [5]
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70 + QuicTLS [6]
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71
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72 Alternatively, nginx can be configured with OpenSSL compatibility
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73 layer, which emulates BoringSSL QUIC API for OpenSSL. This mode is
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74 enabled by default if native QUIC support is not detected.
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75 0-RTT is not supported in OpenSSL compatibility mode.
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76
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77 Clone the NGINX QUIC repository
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78
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79 $ hg clone -b quic https://hg.nginx.org/nginx-quic
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80 $ cd nginx-quic
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81
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82 Use the following command to configure nginx with BoringSSL [4]
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83
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84 $ ./auto/configure --with-debug --with-http_v3_module \
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85 --with-cc-opt="-I../boringssl/include" \
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86 --with-ld-opt="-L../boringssl/build/ssl \
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87 -L../boringssl/build/crypto"
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88 $ make
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89
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90 Alternatively, nginx can be configured with QuicTLS [6]
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91
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92 $ ./auto/configure --with-debug --with-http_v3_module \
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93 --with-cc-opt="-I../quictls/build/include" \
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94 --with-ld-opt="-L../quictls/build/lib"
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95
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96 Alternatively, nginx can be configured with a modern version
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97 of LibreSSL [7]
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98
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99 $ ./auto/configure --with-debug --with-http_v3_module \
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100 --with-cc-opt="-I../libressl/build/include" \
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101 --with-ld-opt="-L../libressl/build/lib"
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102
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103 3. Configuration
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104
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105 The HTTP "listen" directive got a new option "quic" which enables
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106 QUIC as client transport protocol instead of TCP.
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107
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108 The Stream "listen" directive got a new option "quic" which enables
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109 QUIC as client transport protocol instead of TCP or plain UDP.
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110
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111 Along with "quic", it's also possible to specify "reuseport"
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112 option [8] to make it work properly with multiple workers.
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113
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114 To enable address validation:
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115
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116 quic_retry on;
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117
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118 To enable 0-RTT:
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119
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120 ssl_early_data on;
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121
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122 To enable GSO (Generic Segmentation Offloading):
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123
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124 quic_gso on;
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125
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126 To limit maximum UDP payload size on receive path:
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127
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128 quic_mtu <size>;
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129
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130 To set host key for various tokens:
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131
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132 quic_host_key <filename>;
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133
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134 QUIC requires TLSv1.3 protocol, which is enabled by the default
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135 by "ssl_protocols" directive.
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136
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137 By default, GSO Linux-specific optimization [10] is disabled.
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138 Enable it in case a corresponding network interface is configured to
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139 support GSO.
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140
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141 A number of directives were added that configure HTTP/3:
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142
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143 http3
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144 http3_hq
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145 http3_stream_buffer_size
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146 http3_max_concurrent_pushes
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147 http3_max_concurrent_streams
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148 http3_push
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149 http3_push_preload
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150
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151 In http, an additional variable is available: $http3.
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152 The value of $http3 is "h3" for HTTP/3 connections,
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153 "hq" for hq connections, or an empty string otherwise.
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154
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155 In stream, an additional variable is available: $quic.
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156 The value of $quic is "quic" if QUIC connection is used,
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157 or an empty string otherwise.
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158
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159 Example configuration:
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160
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161 http {
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162 log_format quic '$remote_addr - $remote_user [$time_local] '
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163 '"$request" $status $body_bytes_sent '
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164 '"$http_referer" "$http_user_agent" "$http3"';
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165
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166 access_log logs/access.log quic;
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167
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168 server {
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169 # for better compatibility it's recommended
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170 # to use the same port for quic and https
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171 listen 8443 quic reuseport;
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172 listen 8443 ssl;
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173
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174 ssl_certificate certs/example.com.crt;
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175 ssl_certificate_key certs/example.com.key;
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176
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177 location / {
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178 # required for browsers to direct them into quic port
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179 add_header Alt-Svc 'h3=":8443"; ma=86400';
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180 }
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181 }
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182 }
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183
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184 4. Directives
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185
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186 Syntax: quic_bpf on | off;
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187 Default: quic_bpf off;
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188 Context: main
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189
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190 Enables routing of QUIC packets using eBPF.
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191 When enabled, this allows to support QUIC connection migration.
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192 The directive is only supported on Linux 5.7+.
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193
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194
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195 Syntax: quic_retry on | off;
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196 Default: quic_retry off;
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197 Context: http | stream, server
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198
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199 Enables the QUIC Address Validation feature. This includes:
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200 - sending a new token in a Retry packet or a NEW_TOKEN frame
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201 - validating a token received in the Initial packet
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202
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203
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204 Syntax: quic_gso on | off;
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205 Default: quic_gso off;
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206 Context: http | stream, server
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207
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208 Enables sending in optimized batch mode using segmentation offloading.
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209 Optimized sending is only supported on Linux featuring UDP_SEGMENT.
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210
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211
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212 Syntax: quic_mtu size;
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213 Default: quic_mtu 65527;
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214 Context: http | stream, server
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215
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216 Sets the QUIC max_udp_payload_size transport parameter value.
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217 This is the maximum UDP payload that we are willing to receive.
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218
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219
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220 Syntax: quic_host_key file;
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221 Default: -
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222 Context: http | stream, server
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223
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224 Specifies a file with the secret key used to encrypt stateless reset and
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225 address validation tokens. By default, a randomly generated key is used.
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226
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227
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228 Syntax: quic_active_connection_id_limit number;
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229 Default: quic_active_connection_id_limit 2;
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230 Context: http | stream, server
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231
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232 Sets the QUIC active_connection_id_limit transport parameter value.
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233 This is the maximum number of connection IDs we are willing to store.
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234
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235
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236 Syntax: quic_timeout time;
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237 Default: quic_timeout 60s;
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238 Context: stream, server
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239
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240 Defines a timeout used to negotiate the QUIC idle timeout.
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241 In the http module, it is taken from the keepalive_timeout directive.
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242
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243
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244 Syntax: quic_stream_buffer_size size;
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245 Default: quic_stream_buffer_size 64k;
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246 Context: stream, server
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247
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248 Syntax: http3_stream_buffer_size size;
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249 Default: http3_stream_buffer_size 64k;
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250 Context: http, server
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251
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252 Sets buffer size for reading and writing of the QUIC STREAM payload.
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253 The buffer size is used to calculate initial flow control limits
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254 in the following QUIC transport parameters:
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255 - initial_max_data
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256 - initial_max_stream_data_bidi_local
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257 - initial_max_stream_data_bidi_remote
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258 - initial_max_stream_data_uni
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259
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260
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261 Syntax: http3_max_concurrent_pushes number;
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262 Default: http3_max_concurrent_pushes 10;
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263 Context: http, server
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264
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265 Limits the maximum number of concurrent push requests in a connection.
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266
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267
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268 Syntax: http3_max_concurrent_streams number;
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269 Default: http3_max_concurrent_streams 128;
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270 Context: http, server
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271
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272 Sets the maximum number of concurrent HTTP/3 streams in a connection.
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273
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274
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275 Syntax: http3_push uri | off;
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276 Default: http3_push off;
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277 Context: http, server, location
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278
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279 Pre-emptively sends (pushes) a request to the specified uri along with
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280 the response to the original request. Only relative URIs with absolute
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281 path will be processed, for example:
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282
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283 http3_push /static/css/main.css;
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284
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285 The uri value can contain variables.
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286
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287 Several http3_push directives can be specified on the same configuration
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288 level. The off parameter cancels the effect of the http3_push directives
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289 inherited from the previous configuration level.
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290
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291
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292 Syntax: http3_push_preload on | off;
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293 Default: http3_push_preload off;
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294 Context: http, server, location
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295
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296 Enables automatic conversion of preload links specified in the “Link”
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297 response header fields into push requests.
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298
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299
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300 Syntax: http3 on | off;
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301 Default: http3 on;
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302 Context: http, server
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303
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304 Enables HTTP/3 protocol negotiation.
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305
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306
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307 Syntax: http3_hq on | off;
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308 Default: http3_hq off;
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309 Context: http, server
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310
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311 Enables HTTP/0.9 protocol negotiation used in QUIC interoperability tests.
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312
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313 5. Clients
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314
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315 * Browsers
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316
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317 Known to work: Firefox 90+ and Chrome 92+ (QUIC version 1)
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318
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319 Beware of strange issues: sometimes browser may decide to ignore QUIC
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320 Cache clearing/restart might help. Always check access.log and
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321 error.log to make sure the browser is using HTTP/3 and not TCP https.
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322
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323 * Console clients
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324
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325 Known to work: ngtcp2, firefox's neqo and chromium's console clients:
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326
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327 $ examples/client 127.0.0.1 8443 https://example.com:8443/index.html
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328
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329 $ ./neqo-client https://127.0.0.1:8443/
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330
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331 $ chromium-build/out/my_build/quic_client http://example.com:8443
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332
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333
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334 In case everyhing is right, the access log should show something like:
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335
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336 127.0.0.1 - - [24/Apr/2020:11:27:29 +0300] "GET / HTTP/3" 200 805 "-"
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337 "nghttp3/ngtcp2 client" "quic"
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338
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339
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340 6. Troubleshooting
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341
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342 Here are some tips that may help to identify problems:
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343
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344 + Ensure nginx is built with proper SSL library that supports QUIC
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345
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346 + Ensure nginx is using the proper SSL library in runtime
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347 (`nginx -V` shows what it's using)
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348
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349 + Ensure a client is actually sending requests over QUIC
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350 (see "Clients" section about browsers and cache)
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351
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352 We recommend to start with simple console client like ngtcp2
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353 to ensure the server is configured properly before trying
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354 with real browsers that may be very picky with certificates,
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355 for example.
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356
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357 + Build nginx with debug support [9] and check the debug log.
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358 It should contain all details about connection and why it
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359 failed. All related messages contain "quic " prefix and can
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360 be easily filtered out.
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361
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362 + For a deeper investigation, please enable additional debugging
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363 in src/event/quic/ngx_event_quic_connection.h:
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364
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365 #define NGX_QUIC_DEBUG_PACKETS
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366 #define NGX_QUIC_DEBUG_FRAMES
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367 #define NGX_QUIC_DEBUG_ALLOC
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368 #define NGX_QUIC_DEBUG_CRYPTO
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369
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370 7. Contributing
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371
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372 Please refer to
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373 http://nginx.org/en/docs/contributing_changes.html
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374
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375 8. Links
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376
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377 [1] https://datatracker.ietf.org/doc/html/rfc9000
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378 [2] https://datatracker.ietf.org/doc/html/rfc9114
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379 [3] https://mailman.nginx.org/mailman/listinfo/nginx-devel
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380 [4] https://boringssl.googlesource.com/boringssl/
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381 [5] https://www.libressl.org/
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382 [6] https://github.com/quictls/openssl
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383 [7] https://github.com/libressl-portable/portable/releases/tag/v3.6.0
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384 [8] https://nginx.org/en/docs/http/ngx_http_core_module.html#listen
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385 [9] https://nginx.org/en/docs/debugging_log.html
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386 [10] http://vger.kernel.org/lpc_net2018_talks/willemdebruijn-lpc2018-udpgso-paper-DRAFT-1.pdf