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annotate src/http/v3/ngx_http_v3_encode.c @ 8546:d80365ca678d quic

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HTTP/3: require mandatory uni streams before additional ones. As per quic-http-34: Endpoints SHOULD create the HTTP control stream as well as the unidirectional streams required by mandatory extensions (such as the QPACK encoder and decoder streams) first, and then create additional streams as allowed by their peer. Previously, client could create and destroy additional uni streams unlimited number of times before creating mandatory streams.
author Roman Arutyunyan <arut@nginx.com>
date Thu, 29 Jul 2021 10:03:36 +0300
parents 0ac25efb2da3
children b5a305db30e0
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1
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2 /*
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3 * Copyright (C) Roman Arutyunyan
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 uintptr_t
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14 ngx_http_v3_encode_varlen_int(u_char *p, uint64_t value)
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15 {
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16 if (value <= 63) {
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17 if (p == NULL) {
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18 return 1;
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19 }
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20
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21 *p++ = value;
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22 return (uintptr_t) p;
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23 }
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24
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25 if (value <= 16383) {
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26 if (p == NULL) {
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27 return 2;
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28 }
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29
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30 *p++ = 0x40 | (value >> 8);
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31 *p++ = value;
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32 return (uintptr_t) p;
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33 }
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34
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35 if (value <= 1073741823) {
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36 if (p == NULL) {
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37 return 4;
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38 }
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39
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40 *p++ = 0x80 | (value >> 24);
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41 *p++ = (value >> 16);
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42 *p++ = (value >> 8);
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43 *p++ = value;
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44 return (uintptr_t) p;
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45 }
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46
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47 if (p == NULL) {
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48 return 8;
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49 }
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50
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51 *p++ = 0xc0 | (value >> 56);
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52 *p++ = (value >> 48);
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53 *p++ = (value >> 40);
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54 *p++ = (value >> 32);
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55 *p++ = (value >> 24);
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56 *p++ = (value >> 16);
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57 *p++ = (value >> 8);
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58 *p++ = value;
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59 return (uintptr_t) p;
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60 }
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61
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62
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63 uintptr_t
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64 ngx_http_v3_encode_prefix_int(u_char *p, uint64_t value, ngx_uint_t prefix)
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65 {
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66 ngx_uint_t thresh, n;
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67
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68 thresh = (1 << prefix) - 1;
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69
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70 if (value < thresh) {
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71 if (p == NULL) {
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72 return 1;
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73 }
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74
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75 *p++ |= value;
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76 return (uintptr_t) p;
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77 }
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78
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79 value -= thresh;
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80
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81 if (p == NULL) {
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82 for (n = 2; value >= 128; n++) {
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83 value >>= 7;
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84 }
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85
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86 return n;
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87 }
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88
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89 *p++ |= thresh;
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90
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91 while (value >= 128) {
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92 *p++ = 0x80 | value;
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93 value >>= 7;
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94 }
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95
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96 *p++ = value;
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97
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98 return (uintptr_t) p;
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99 }
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100
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101
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102 uintptr_t
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103 ngx_http_v3_encode_field_section_prefix(u_char *p, ngx_uint_t insert_count,
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104 ngx_uint_t sign, ngx_uint_t delta_base)
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105 {
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106 if (p == NULL) {
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107 return ngx_http_v3_encode_prefix_int(NULL, insert_count, 8)
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108 + ngx_http_v3_encode_prefix_int(NULL, delta_base, 7);
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109 }
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110
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111 *p = 0;
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112 p = (u_char *) ngx_http_v3_encode_prefix_int(p, insert_count, 8);
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113
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114 *p = sign ? 0x80 : 0;
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115 p = (u_char *) ngx_http_v3_encode_prefix_int(p, delta_base, 7);
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116
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117 return (uintptr_t) p;
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118 }
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119
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120
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121 uintptr_t
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122 ngx_http_v3_encode_field_ri(u_char *p, ngx_uint_t dynamic, ngx_uint_t index)
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123 {
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124 /* Indexed Field Line */
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125
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126 if (p == NULL) {
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127 return ngx_http_v3_encode_prefix_int(NULL, index, 6);
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128 }
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129
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130 *p = dynamic ? 0x80 : 0xc0;
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131
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132 return ngx_http_v3_encode_prefix_int(p, index, 6);
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133 }
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134
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135
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136 uintptr_t
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137 ngx_http_v3_encode_field_lri(u_char *p, ngx_uint_t dynamic, ngx_uint_t index,
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138 u_char *data, size_t len)
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139 {
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140 /* Literal Field Line With Name Reference */
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141
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142 if (p == NULL) {
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143 return ngx_http_v3_encode_prefix_int(NULL, index, 4)
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144 + ngx_http_v3_encode_prefix_int(NULL, len, 7)
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145 + len;
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146 }
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147
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148 *p = dynamic ? 0x40 : 0x50;
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149 p = (u_char *) ngx_http_v3_encode_prefix_int(p, index, 4);
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150
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151 *p = 0;
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152 p = (u_char *) ngx_http_v3_encode_prefix_int(p, len, 7);
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153
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154 if (data) {
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155 p = ngx_cpymem(p, data, len);
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156 }
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157
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158 return (uintptr_t) p;
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159 }
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160
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161
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162 uintptr_t
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Sergey Kandaurov <pluknet@nginx.com>
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163 ngx_http_v3_encode_field_l(u_char *p, ngx_str_t *name, ngx_str_t *value)
8006
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164 {
8508
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165 /* Literal Field Line With Literal Name */
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166
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167 if (p == NULL) {
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168 return ngx_http_v3_encode_prefix_int(NULL, name->len, 3)
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169 + name->len
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170 + ngx_http_v3_encode_prefix_int(NULL, value->len, 7)
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171 + value->len;
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172 }
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173
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985f9351dd87 HTTP/3: do not set the never-indexed literal bit by default.
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174 *p = 0x20;
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175 p = (u_char *) ngx_http_v3_encode_prefix_int(p, name->len, 3);
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176
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177 ngx_strlow(p, name->data, name->len);
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178 p += name->len;
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179
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180 *p = 0;
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181 p = (u_char *) ngx_http_v3_encode_prefix_int(p, value->len, 7);
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182
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183 p = ngx_cpymem(p, value->data, value->len);
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184
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185 return (uintptr_t) p;
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186 }
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187
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188
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189 uintptr_t
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190 ngx_http_v3_encode_field_pbi(u_char *p, ngx_uint_t index)
8006
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191 {
8508
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diff changeset
192 /* Indexed Field Line With Post-Base Index */
8006
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193
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194 if (p == NULL) {
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195 return ngx_http_v3_encode_prefix_int(NULL, index, 4);
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196 }
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197
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198 *p = 0x10;
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199
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200 return ngx_http_v3_encode_prefix_int(p, index, 4);
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201 }
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diff changeset
202
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203
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diff changeset
204 uintptr_t
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Sergey Kandaurov <pluknet@nginx.com>
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diff changeset
205 ngx_http_v3_encode_field_lpbi(u_char *p, ngx_uint_t index, u_char *data,
8006
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206 size_t len)
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diff changeset
207 {
8508
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Sergey Kandaurov <pluknet@nginx.com>
parents: 8072
diff changeset
208 /* Literal Field Line With Post-Base Name Reference */
8006
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diff changeset
209
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diff changeset
210 if (p == NULL) {
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211 return ngx_http_v3_encode_prefix_int(NULL, index, 3)
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parents: 7950
diff changeset
212 + ngx_http_v3_encode_prefix_int(NULL, len, 7)
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213 + len;
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parents: 7950
diff changeset
214 }
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Roman Arutyunyan <arut@nginx.com>
parents: 7950
diff changeset
215
8072
985f9351dd87 HTTP/3: do not set the never-indexed literal bit by default.
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parents: 8009
diff changeset
216 *p = 0;
8006
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diff changeset
217 p = (u_char *) ngx_http_v3_encode_prefix_int(p, index, 3);
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parents: 7950
diff changeset
218
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diff changeset
219 *p = 0;
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220 p = (u_char *) ngx_http_v3_encode_prefix_int(p, len, 7);
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parents: 7950
diff changeset
221
79125ef2e39f HTTP/3: header encoding functions.
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diff changeset
222 if (data) {
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diff changeset
223 p = ngx_cpymem(p, data, len);
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diff changeset
224 }
79125ef2e39f HTTP/3: header encoding functions.
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parents: 7950
diff changeset
225
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226 return (uintptr_t) p;
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parents: 7950
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227 }