Mercurial > hg > nginx
annotate src/http/v2/ngx_http_v2.h @ 6833:3834951e32ab
HTTP/2: fixed posted streams handling.
A bug was introduced by 82efcedb310b that could lead to timing out of
responses or segmentation fault, when accept_mutex was enabled.
The output queue in HTTP/2 can contain frames from different streams.
When the queue is sent, all related write handlers need to be called.
In order to do so, the streams were added to the h2c->posted queue
after handling sent frames. Then this queue was processed in
ngx_http_v2_write_handler().
If accept_mutex is enabled, the event's "ready" flag is set but its
handler is not called immediately. Instead, the event is added to
the ngx_posted_events queue. At the same time in this queue can be
events from upstream connections. Such events can result in sending
output queue before ngx_http_v2_write_handler() is triggered. And
at the time ngx_http_v2_write_handler() is called, the output queue
can be already empty with some streams added to h2c->posted.
But after 82efcedb310b, these streams weren't processed if all frames
have already been sent and the output queue was empty. This might lead
to a situation when a number of streams were get stuck in h2c->posted
queue for a long time. Eventually these streams might get closed by
the send timeout.
In the worst case this might also lead to a segmentation fault, if
already freed stream was left in the h2c->posted queue. This could
happen if one of the streams was terminated but wasn't closed, due to
the HEADERS frame or a partially sent DATA frame left in the output
queue. If this happened the ngx_http_v2_filter_cleanup() handler
removed the stream from the h2c->waiting or h2c->posted queue on
termination stage, before the frame has been sent, and the stream
was again added to the h2c->posted queue after the frame was sent.
In order to fix all these problems and simplify the code, write
events of fake stream connections are now added to ngx_posted_events
instead of using a custom h2c->posted queue.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Mon, 28 Nov 2016 20:58:14 +0300 |
parents | 5e95b9fb33b7 |
children | 28dc369899ea |
rev | line source |
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1 /* |
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2 * Copyright (C) Nginx, Inc. |
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3 * Copyright (C) Valentin V. Bartenev |
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4 */ |
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5 |
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6 |
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7 #ifndef _NGX_HTTP_V2_H_INCLUDED_ |
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8 #define _NGX_HTTP_V2_H_INCLUDED_ |
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9 |
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10 |
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11 #include <ngx_config.h> |
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12 #include <ngx_core.h> |
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13 #include <ngx_http.h> |
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14 |
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15 |
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16 #define NGX_HTTP_V2_ALPN_ADVERTISE "\x02h2" |
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17 #define NGX_HTTP_V2_NPN_ADVERTISE NGX_HTTP_V2_ALPN_ADVERTISE |
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18 |
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19 #define NGX_HTTP_V2_STATE_BUFFER_SIZE 16 |
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20 |
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21 #define NGX_HTTP_V2_MAX_FRAME_SIZE ((1 << 24) - 1) |
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22 |
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23 #define NGX_HTTP_V2_INT_OCTETS 4 |
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24 #define NGX_HTTP_V2_MAX_FIELD \ |
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25 (127 + (1 << (NGX_HTTP_V2_INT_OCTETS - 1) * 7) - 1) |
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26 |
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27 #define NGX_HTTP_V2_FRAME_HEADER_SIZE 9 |
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28 |
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29 /* frame types */ |
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30 #define NGX_HTTP_V2_DATA_FRAME 0x0 |
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31 #define NGX_HTTP_V2_HEADERS_FRAME 0x1 |
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32 #define NGX_HTTP_V2_PRIORITY_FRAME 0x2 |
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33 #define NGX_HTTP_V2_RST_STREAM_FRAME 0x3 |
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34 #define NGX_HTTP_V2_SETTINGS_FRAME 0x4 |
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35 #define NGX_HTTP_V2_PUSH_PROMISE_FRAME 0x5 |
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36 #define NGX_HTTP_V2_PING_FRAME 0x6 |
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37 #define NGX_HTTP_V2_GOAWAY_FRAME 0x7 |
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38 #define NGX_HTTP_V2_WINDOW_UPDATE_FRAME 0x8 |
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39 #define NGX_HTTP_V2_CONTINUATION_FRAME 0x9 |
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40 |
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41 /* frame flags */ |
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42 #define NGX_HTTP_V2_NO_FLAG 0x00 |
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43 #define NGX_HTTP_V2_ACK_FLAG 0x01 |
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44 #define NGX_HTTP_V2_END_STREAM_FLAG 0x01 |
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45 #define NGX_HTTP_V2_END_HEADERS_FLAG 0x04 |
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46 #define NGX_HTTP_V2_PADDED_FLAG 0x08 |
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47 #define NGX_HTTP_V2_PRIORITY_FLAG 0x20 |
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48 |
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49 #define NGX_HTTP_V2_MAX_WINDOW ((1U << 31) - 1) |
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50 #define NGX_HTTP_V2_DEFAULT_WINDOW 65535 |
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51 |
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52 |
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53 typedef struct ngx_http_v2_connection_s ngx_http_v2_connection_t; |
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54 typedef struct ngx_http_v2_node_s ngx_http_v2_node_t; |
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55 typedef struct ngx_http_v2_out_frame_s ngx_http_v2_out_frame_t; |
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56 |
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57 |
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58 typedef u_char *(*ngx_http_v2_handler_pt) (ngx_http_v2_connection_t *h2c, |
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59 u_char *pos, u_char *end); |
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60 |
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61 |
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62 typedef struct { |
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63 ngx_str_t name; |
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64 ngx_str_t value; |
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65 } ngx_http_v2_header_t; |
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66 |
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67 |
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68 typedef struct { |
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69 ngx_uint_t sid; |
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70 size_t length; |
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71 size_t padding; |
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72 unsigned flags:8; |
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73 |
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74 unsigned incomplete:1; |
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75 unsigned keep_pool:1; |
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76 |
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77 /* HPACK */ |
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78 unsigned parse_name:1; |
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79 unsigned parse_value:1; |
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80 unsigned index:1; |
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81 ngx_http_v2_header_t header; |
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82 size_t header_limit; |
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83 u_char field_state; |
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84 u_char *field_start; |
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85 u_char *field_end; |
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86 size_t field_rest; |
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87 ngx_pool_t *pool; |
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88 |
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89 ngx_http_v2_stream_t *stream; |
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90 |
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91 u_char buffer[NGX_HTTP_V2_STATE_BUFFER_SIZE]; |
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92 size_t buffer_used; |
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93 ngx_http_v2_handler_pt handler; |
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94 } ngx_http_v2_state_t; |
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95 |
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96 |
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97 |
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98 typedef struct { |
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99 ngx_http_v2_header_t **entries; |
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100 |
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101 ngx_uint_t added; |
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102 ngx_uint_t deleted; |
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103 ngx_uint_t reused; |
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104 ngx_uint_t allocated; |
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105 |
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106 size_t size; |
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107 size_t free; |
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108 u_char *storage; |
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109 u_char *pos; |
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110 } ngx_http_v2_hpack_t; |
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111 |
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112 |
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113 struct ngx_http_v2_connection_s { |
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114 ngx_connection_t *connection; |
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The HTTP/2 implementation (RFC 7240, 7241).
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115 ngx_http_connection_t *http_connection; |
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116 |
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117 ngx_uint_t processing; |
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118 |
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119 size_t send_window; |
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120 size_t recv_window; |
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121 size_t init_window; |
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122 |
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123 size_t frame_size; |
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124 |
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125 ngx_queue_t waiting; |
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126 |
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127 ngx_http_v2_state_t state; |
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128 |
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129 ngx_http_v2_hpack_t hpack; |
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130 |
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131 ngx_pool_t *pool; |
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132 |
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133 ngx_http_v2_out_frame_t *free_frames; |
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134 ngx_connection_t *free_fake_connections; |
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135 |
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136 ngx_http_v2_node_t **streams_index; |
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137 |
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138 ngx_http_v2_out_frame_t *last_out; |
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139 |
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140 ngx_queue_t dependencies; |
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141 ngx_queue_t closed; |
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142 |
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143 ngx_uint_t last_sid; |
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144 |
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145 unsigned closed_nodes:8; |
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146 unsigned settings_ack:1; |
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147 unsigned blocked:1; |
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HTTP/2: graceful shutdown of active connections (closes #1106).
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148 unsigned goaway:1; |
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149 }; |
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150 |
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151 |
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152 struct ngx_http_v2_node_s { |
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153 ngx_uint_t id; |
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154 ngx_http_v2_node_t *index; |
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155 ngx_http_v2_node_t *parent; |
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156 ngx_queue_t queue; |
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157 ngx_queue_t children; |
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158 ngx_queue_t reuse; |
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159 ngx_uint_t rank; |
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160 ngx_uint_t weight; |
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The HTTP/2 implementation (RFC 7240, 7241).
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161 double rel_weight; |
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162 ngx_http_v2_stream_t *stream; |
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163 }; |
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164 |
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165 |
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166 struct ngx_http_v2_stream_s { |
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167 ngx_http_request_t *request; |
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168 ngx_http_v2_connection_t *connection; |
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169 ngx_http_v2_node_t *node; |
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170 |
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171 ngx_uint_t queued; |
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172 |
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173 /* |
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174 * A change to SETTINGS_INITIAL_WINDOW_SIZE could cause the |
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The HTTP/2 implementation (RFC 7240, 7241).
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175 * send_window to become negative, hence it's signed. |
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176 */ |
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The HTTP/2 implementation (RFC 7240, 7241).
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177 ssize_t send_window; |
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178 size_t recv_window; |
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179 |
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180 ngx_buf_t *preread; |
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181 |
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182 ngx_http_v2_out_frame_t *free_frames; |
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183 ngx_chain_t *free_frame_headers; |
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184 ngx_chain_t *free_bufs; |
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185 |
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186 ngx_queue_t queue; |
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187 |
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188 ngx_array_t *cookies; |
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189 |
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190 size_t header_limit; |
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191 |
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192 ngx_pool_t *pool; |
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HTTP/2: always use temporary pool for processing headers.
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193 |
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HTTP/2: fixed posted streams handling.
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194 unsigned waiting:1; |
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195 unsigned blocked:1; |
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196 unsigned exhausted:1; |
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197 unsigned in_closed:1; |
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198 unsigned out_closed:1; |
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HTTP/2: sending RST_STREAM with NO_ERROR to discard request body.
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199 unsigned rst_sent:1; |
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200 unsigned no_flow_control:1; |
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201 unsigned skip_data:1; |
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202 }; |
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203 |
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204 |
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205 struct ngx_http_v2_out_frame_s { |
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206 ngx_http_v2_out_frame_t *next; |
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207 ngx_chain_t *first; |
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208 ngx_chain_t *last; |
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209 ngx_int_t (*handler)(ngx_http_v2_connection_t *h2c, |
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210 ngx_http_v2_out_frame_t *frame); |
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211 |
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212 ngx_http_v2_stream_t *stream; |
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213 size_t length; |
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214 |
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|
215 unsigned blocked:1; |
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216 unsigned fin:1; |
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217 }; |
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218 |
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219 |
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220 static ngx_inline void |
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The HTTP/2 implementation (RFC 7240, 7241).
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221 ngx_http_v2_queue_frame(ngx_http_v2_connection_t *h2c, |
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222 ngx_http_v2_out_frame_t *frame) |
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|
223 { |
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|
224 ngx_http_v2_out_frame_t **out; |
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225 |
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226 for (out = &h2c->last_out; *out; out = &(*out)->next) { |
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227 |
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|
228 if ((*out)->blocked || (*out)->stream == NULL) { |
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The HTTP/2 implementation (RFC 7240, 7241).
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229 break; |
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230 } |
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231 |
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232 if ((*out)->stream->node->rank < frame->stream->node->rank |
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233 || ((*out)->stream->node->rank == frame->stream->node->rank |
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234 && (*out)->stream->node->rel_weight |
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235 >= frame->stream->node->rel_weight)) |
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The HTTP/2 implementation (RFC 7240, 7241).
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236 { |
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237 break; |
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238 } |
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239 } |
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240 |
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The HTTP/2 implementation (RFC 7240, 7241).
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241 frame->next = *out; |
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242 *out = frame; |
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243 } |
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244 |
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245 |
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246 static ngx_inline void |
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247 ngx_http_v2_queue_blocked_frame(ngx_http_v2_connection_t *h2c, |
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248 ngx_http_v2_out_frame_t *frame) |
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249 { |
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250 ngx_http_v2_out_frame_t **out; |
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251 |
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252 for (out = &h2c->last_out; *out; out = &(*out)->next) |
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253 { |
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254 if ((*out)->blocked || (*out)->stream == NULL) { |
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255 break; |
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256 } |
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257 } |
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258 |
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259 frame->next = *out; |
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260 *out = frame; |
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261 } |
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262 |
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263 |
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264 void ngx_http_v2_init(ngx_event_t *rev); |
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265 void ngx_http_v2_request_headers_init(void); |
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266 |
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267 ngx_int_t ngx_http_v2_read_request_body(ngx_http_request_t *r, |
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268 ngx_http_client_body_handler_pt post_handler); |
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269 ngx_int_t ngx_http_v2_read_unbuffered_request_body(ngx_http_request_t *r); |
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270 |
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271 void ngx_http_v2_close_stream(ngx_http_v2_stream_t *stream, ngx_int_t rc); |
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272 |
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273 ngx_int_t ngx_http_v2_send_output_queue(ngx_http_v2_connection_t *h2c); |
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274 |
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275 |
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276 ngx_int_t ngx_http_v2_get_indexed_header(ngx_http_v2_connection_t *h2c, |
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277 ngx_uint_t index, ngx_uint_t name_only); |
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278 ngx_int_t ngx_http_v2_add_header(ngx_http_v2_connection_t *h2c, |
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279 ngx_http_v2_header_t *header); |
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280 ngx_int_t ngx_http_v2_table_size(ngx_http_v2_connection_t *h2c, size_t size); |
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281 |
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282 |
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283 ngx_int_t ngx_http_v2_huff_decode(u_char *state, u_char *src, size_t len, |
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284 u_char **dst, ngx_uint_t last, ngx_log_t *log); |
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HTTP/2: implemented HPACK Huffman encoding for response headers.
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285 size_t ngx_http_v2_huff_encode(u_char *src, size_t len, u_char *dst, |
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|
286 ngx_uint_t lower); |
6246
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287 |
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288 |
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289 #define ngx_http_v2_prefix(bits) ((1 << (bits)) - 1) |
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290 |
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291 |
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292 #if (NGX_HAVE_NONALIGNED) |
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293 |
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294 #define ngx_http_v2_parse_uint16(p) ntohs(*(uint16_t *) (p)) |
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295 #define ngx_http_v2_parse_uint32(p) ntohl(*(uint32_t *) (p)) |
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296 |
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|
297 #else |
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298 |
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299 #define ngx_http_v2_parse_uint16(p) ((p)[0] << 8 | (p)[1]) |
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300 #define ngx_http_v2_parse_uint32(p) \ |
6627
ad736705a744
HTTP/2: avoid left-shifting signed integer into the sign bit.
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parents:
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301 ((uint32_t) (p)[0] << 24 | (p)[1] << 16 | (p)[2] << 8 | (p)[3]) |
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302 |
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303 #endif |
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304 |
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305 #define ngx_http_v2_parse_length(p) ((p) >> 8) |
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306 #define ngx_http_v2_parse_type(p) ((p) & 0xff) |
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307 #define ngx_http_v2_parse_sid(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff) |
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The HTTP/2 implementation (RFC 7240, 7241).
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308 #define ngx_http_v2_parse_window(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff) |
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309 |
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310 |
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|
311 #define ngx_http_v2_write_uint16_aligned(p, s) \ |
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312 (*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t)) |
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313 #define ngx_http_v2_write_uint32_aligned(p, s) \ |
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314 (*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t)) |
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315 |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
316 #if (NGX_HAVE_NONALIGNED) |
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317 |
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318 #define ngx_http_v2_write_uint16 ngx_http_v2_write_uint16_aligned |
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319 #define ngx_http_v2_write_uint32 ngx_http_v2_write_uint32_aligned |
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320 |
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|
321 #else |
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|
322 |
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|
323 #define ngx_http_v2_write_uint16(p, s) \ |
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324 ((p)[0] = (u_char) ((s) >> 8), \ |
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The HTTP/2 implementation (RFC 7240, 7241).
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325 (p)[1] = (u_char) (s), \ |
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|
326 (p) + sizeof(uint16_t)) |
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|
327 |
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The HTTP/2 implementation (RFC 7240, 7241).
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328 #define ngx_http_v2_write_uint32(p, s) \ |
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329 ((p)[0] = (u_char) ((s) >> 24), \ |
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The HTTP/2 implementation (RFC 7240, 7241).
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330 (p)[1] = (u_char) ((s) >> 16), \ |
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|
331 (p)[2] = (u_char) ((s) >> 8), \ |
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332 (p)[3] = (u_char) (s), \ |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
333 (p) + sizeof(uint32_t)) |
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parents:
diff
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|
334 |
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parents:
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|
335 #endif |
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|
336 |
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The HTTP/2 implementation (RFC 7240, 7241).
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337 #define ngx_http_v2_write_len_and_type(p, l, t) \ |
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338 ngx_http_v2_write_uint32_aligned(p, (l) << 8 | (t)) |
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|
339 |
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|
340 #define ngx_http_v2_write_sid ngx_http_v2_write_uint32 |
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341 |
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The HTTP/2 implementation (RFC 7240, 7241).
Valentin Bartenev <vbart@nginx.com>
parents:
diff
changeset
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342 #endif /* _NGX_HTTP_V2_H_INCLUDED_ */ |