Mercurial > hg > nginx-quic
annotate README @ 8760:6ccf3867959a quic
QUIC: refactored ngx_quic_order_bufs() and ngx_quic_split_bufs().
They are replaced with ngx_quic_write_chain() and ngx_quic_read_chain().
These functions represent the API to data buffering.
The first function adds data of given size at given offset to the buffer.
Now it returns the unwritten part of the chain similar to c->send_chain().
The second function returns data of given size from the beginning of the buffer.
Its second argument and return value are swapped compared to
ngx_quic_split_bufs() to better match ngx_quic_write_chain().
Added, returned and stored data are regular ngx_chain_t/ngx_buf_t chains.
Missing data is marked with b->sync flag.
The functions are now used in both send and recv data chains in QUIC streams.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Fri, 24 Dec 2021 18:17:23 +0300 |
parents | 44553428288d |
children | 6f8253673669 |
rev | line source |
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7843 | 1 Experimental QUIC support for nginx |
2 ----------------------------------- | |
3 | |
4 1. Introduction | |
5 2. Installing | |
6 3. Configuration | |
7 4. Clients | |
8 5. Troubleshooting | |
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9 6. Contributing |
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10 7. Links |
7843 | 11 |
12 1. Introduction | |
13 | |
14 This is an experimental QUIC [1] / HTTP/3 [2] support for nginx. | |
15 | |
16 The code is developed in a separate "quic" branch available | |
17 at https://hg.nginx.org/nginx-quic. Currently it is based | |
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18 on nginx mainline 1.21.x. We merge new nginx releases into |
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19 this branch regularly. |
7843 | 20 |
21 The project code base is under the same BSD license as nginx. | |
22 | |
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23 The code is currently at a beta level of quality and should not |
7843 | 24 be used in production. |
25 | |
26 We are working on improving HTTP/3 support with the goal of | |
27 integrating it to the main NGINX codebase. Expect frequent | |
28 updates of this code and don't rely on it for whatever purpose. | |
29 | |
30 We'll be grateful for any feedback and code submissions however | |
31 we don't bear any responsibilities for any issues with this code. | |
32 | |
33 You can always contact us via nginx-devel mailing list [3]. | |
34 | |
35 What works now: | |
36 | |
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37 Currently we support IETF-QUIC draft-29 through final RFC documents. |
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38 Earlier drafts are NOT supported as they have incompatible wire format. |
7843 | 39 |
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40 nginx should be able to respond to HTTP/3 requests over QUIC and |
7843 | 41 it should be possible to upload and download big files without errors. |
42 | |
43 + The handshake completes successfully | |
44 + One endpoint can update keys and its peer responds correctly | |
7867 | 45 + 0-RTT data is being received and acted on |
7843 | 46 + Connection is established using TLS Resume Ticket |
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47 + A handshake that includes a Retry packet completes successfully |
7843 | 48 + Stream data is being exchanged and ACK'ed |
49 + An H3 transaction succeeded | |
50 + One or both endpoints insert entries into dynamic table and | |
51 subsequently reference them from header blocks | |
8065 | 52 + Version Negotiation packet is sent to client with unknown version |
53 + Lost packets are detected and retransmitted properly | |
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54 + Clients may migrate to new address |
7843 | 55 |
56 Not (yet) supported features: | |
57 | |
8065 | 58 - Explicit Congestion Notification (ECN) as specified in quic-recovery [5] |
7843 | 59 - A connection with the spin bit succeeds and the bit is spinning |
60 - Structured Logging | |
61 | |
62 Since the code is experimental and still under development, | |
63 a lot of things may not work as expected, for example: | |
64 | |
65 - Flow control mechanism is basic and intended to avoid CPU hog and make | |
66 simple interactions possible | |
67 | |
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68 - Not all protocol requirements are strictly followed; some of checks are |
7843 | 69 omitted for the sake of simplicity of initial implementation |
70 | |
71 2. Installing | |
72 | |
73 You will need a BoringSSL [4] library that provides QUIC support | |
74 | |
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75 $ hg clone -b quic https://hg.nginx.org/nginx-quic |
7843 | 76 $ cd nginx-quic |
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77 $ ./auto/configure --with-debug --with-http_v3_module \ |
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78 --with-cc-opt="-I../boringssl/include" \ |
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79 --with-ld-opt="-L../boringssl/build/ssl \ |
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80 -L../boringssl/build/crypto" |
7843 | 81 $ make |
82 | |
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83 When configuring nginx, you can enable QUIC and HTTP/3 using the |
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84 following new configuration options: |
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85 |
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86 --with-http_v3_module - enable QUIC and HTTP/3 |
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87 --with-stream_quic_module - enable QUIC in Stream |
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88 |
7843 | 89 3. Configuration |
90 | |
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91 The HTTP "listen" directive got a new option "http3" which enables |
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92 HTTP/3 over QUIC on the specified port. |
7843 | 93 |
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94 The Stream "listen" directive got a new option "quic" which enables |
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95 QUIC as client transport protocol instead of TCP or plain UDP. |
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96 |
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97 Along with "http3" or "quic", you also have to specify "reuseport" |
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98 option [6] to make it work properly with multiple workers. |
7843 | 99 |
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100 To enable address validation: |
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101 |
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102 quic_retry on; |
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103 |
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104 To enable 0-RTT: |
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105 |
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106 ssl_early_data on; |
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107 |
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108 Make sure that TLS 1.3 is configured which is required for QUIC: |
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109 |
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110 ssl_protocols TLSv1.3; |
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111 |
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112 To enable GSO (Generic Segmentation Offloading): |
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113 |
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114 quic_gso on; |
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115 |
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116 To limit maximum packet size: |
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117 |
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118 quic_mtu <size>; |
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119 |
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120 To set host key for various tokens: |
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121 |
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122 quic_host_key <filename>; |
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123 |
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124 |
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125 By default this Linux-specific optimization [8] is disabled. |
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126 Enable if your network interface is configured to support GSO. |
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127 |
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128 A number of directives were added that configure HTTP/3: |
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129 |
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130 http3_stream_buffer_size |
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131 http3_max_concurrent_pushes |
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132 http3_max_concurrent_streams |
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133 http3_push |
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134 http3_push_preload |
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135 http3_hq (requires NGX_HTTP_V3_HQ macro) |
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136 |
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137 In http, an additional variable is available: $http3. |
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138 The value of $http3 is "h3" for HTTP/3 connections, |
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139 "hq" for hq connections, or an empty string otherwise. |
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140 |
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141 In stream, an additional variable is available: $quic. |
7843 | 142 The value of $quic is "quic" if QUIC connection is used, |
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143 or an empty string otherwise. |
7843 | 144 |
145 Example configuration: | |
146 | |
147 http { | |
148 log_format quic '$remote_addr - $remote_user [$time_local] ' | |
149 '"$request" $status $body_bytes_sent ' | |
8718 | 150 '"$http_referer" "$http_user_agent" "$http3"'; |
7843 | 151 |
152 access_log logs/access.log quic; | |
153 | |
154 server { | |
155 # for better compatibility it's recommended | |
156 # to use the same port for quic and https | |
157 listen 8443 http3 reuseport; | |
158 listen 8443 ssl; | |
159 | |
160 ssl_certificate certs/example.com.crt; | |
161 ssl_certificate_key certs/example.com.key; | |
162 ssl_protocols TLSv1.3; | |
163 | |
164 location / { | |
165 # required for browsers to direct them into quic port | |
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166 add_header Alt-Svc 'h3=":8443"; ma=86400'; |
7843 | 167 } |
168 } | |
169 } | |
170 | |
171 4. Clients | |
172 | |
173 * Browsers | |
174 | |
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175 Known to work: Firefox 80+ and Chrome 85+ (QUIC draft 29+) |
7843 | 176 |
177 Beware of strange issues: sometimes browser may decide to ignore QUIC | |
178 Cache clearing/restart might help. Always check access.log and | |
179 error.log to make sure you are using HTTP/3 and not TCP https. | |
180 | |
181 + to enable QUIC in Firefox, set the following in 'about:config': | |
182 network.http.http3.enabled = true | |
183 | |
184 + to enable QUIC in Chrome, enable it on command line and force it | |
185 on your site: | |
186 | |
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187 $ ./chrome --enable-quic --quic-version=h3-29 \ |
7843 | 188 --origin-to-force-quic-on=example.com:8443 |
189 | |
190 * Console clients | |
191 | |
192 Known to work: ngtcp2, firefox's neqo and chromium's console clients: | |
193 | |
194 $ examples/client 127.0.0.1 8443 https://example.com:8443/index.html | |
195 | |
196 $ ./neqo-client https://127.0.0.1:8443/ | |
197 | |
198 $ chromium-build/out/my_build/quic_client http://example.com:8443 \ | |
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199 --quic_version=h3-29 \ |
7843 | 200 --allow_unknown_root_cert \ |
201 --disable_certificate_verification | |
202 | |
203 | |
204 If you've got it right, in the access log you should see something like: | |
205 | |
206 127.0.0.1 - - [24/Apr/2020:11:27:29 +0300] "GET / HTTP/3" 200 805 "-" | |
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207 "nghttp3/ngtcp2 client" "quic" |
7843 | 208 |
209 | |
210 5. Troubleshooting | |
211 | |
212 Here are some tips that may help you to identify problems: | |
213 | |
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214 + Ensure you are building with proper SSL library that supports QUIC |
7843 | 215 |
216 + Ensure you are using the proper SSL library in runtime | |
217 (`nginx -V` will show you what you are using) | |
218 | |
219 + Ensure your client is actually sending QUIC requests | |
220 (see "Clients" section about browsers and cache) | |
221 | |
222 We recommend to start with simple console client like ngtcp2 | |
223 to ensure you've got server configured properly before trying | |
7872 | 224 with real browsers that may be very picky with certificates, |
7843 | 225 for example. |
226 | |
227 + Build nginx with debug support [7] and check your debug log. | |
228 It should contain all details about connection and why it | |
229 failed. All related messages contain "quic " prefix and can | |
230 be easily filtered out. | |
231 | |
232 + If you want to investigate deeper, you may want to enable | |
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233 additional debugging in src/event/quic/ngx_event_quic_connection.h: |
7843 | 234 |
235 #define NGX_QUIC_DEBUG_PACKETS | |
236 #define NGX_QUIC_DEBUG_FRAMES | |
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237 #define NGX_QUIC_DEBUG_ALLOC |
7843 | 238 #define NGX_QUIC_DEBUG_CRYPTO |
239 | |
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240 6. Contributing |
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241 |
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242 If you are willing to contribute, please refer to |
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243 http://nginx.org/en/docs/contributing_changes.html |
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244 |
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245 7. Links |
7843 | 246 |
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247 [1] https://datatracker.ietf.org/doc/html/rfc9000 |
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248 [2] https://datatracker.ietf.org/doc/html/draft-ietf-quic-http |
7843 | 249 [3] https://mailman.nginx.org/mailman/listinfo/nginx-devel |
250 [4] https://boringssl.googlesource.com/boringssl/ | |
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251 [5] https://datatracker.ietf.org/doc/html/rfc9002 |
7843 | 252 [6] https://nginx.org/en/docs/http/ngx_http_core_module.html#listen |
253 [7] https://nginx.org/en/docs/debugging_log.html | |
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254 [8] http://vger.kernel.org/lpc_net2018_talks/willemdebruijn-lpc2018-udpgso-paper-DRAFT-1.pdf |