Mercurial > hg > nginx
annotate src/http/modules/ngx_http_stub_status_module.c @ 9170:c80d111340dc
QUIC: prevented generating ACK frames with discarded keys.
Previously it was possible to generate ACK frames using formally discarded
protection keys, in particular, when acknowledging a client Handshake packet
used to complete the TLS handshake and to discard handshake protection keys.
As it happens late in packet processing, it could be possible to generate ACK
frames after the keys were already discarded.
ACK frames are generated from ngx_quic_ack_packet(), either using a posted
push event, which envolves ngx_quic_generate_ack() as a part of the final
packet assembling, or directly in ngx_quic_ack_packet(), such as when there
is no room to add a new ACK range or when the received packet is out of order.
The added keys availability check is used to avoid generating late ACK frames
in both cases.
| author | Sergey Kandaurov <pluknet@nginx.com> |
|---|---|
| date | Fri, 20 Oct 2023 18:05:07 +0400 |
| parents | 43a0a9e988be |
| children |
| rev | line source |
|---|---|
| 577 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
| 577 | 5 */ |
| 6 | |
| 487 | 7 |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_http.h> | |
| 11 | |
| 12 | |
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13 static ngx_int_t ngx_http_stub_status_handler(ngx_http_request_t *r); |
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14 static ngx_int_t ngx_http_stub_status_variable(ngx_http_request_t *r, |
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15 ngx_http_variable_value_t *v, uintptr_t data); |
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16 static ngx_int_t ngx_http_stub_status_add_variables(ngx_conf_t *cf); |
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17 static char *ngx_http_set_stub_status(ngx_conf_t *cf, ngx_command_t *cmd, |
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18 void *conf); |
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19 |
| 577 | 20 |
| 487 | 21 static ngx_command_t ngx_http_status_commands[] = { |
| 22 | |
| 23 { ngx_string("stub_status"), | |
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24 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS|NGX_CONF_TAKE1, |
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25 ngx_http_set_stub_status, |
| 487 | 26 0, |
| 27 0, | |
| 28 NULL }, | |
| 29 | |
| 30 ngx_null_command | |
| 577 | 31 }; |
| 487 | 32 |
| 33 | |
| 667 | 34 static ngx_http_module_t ngx_http_stub_status_module_ctx = { |
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35 ngx_http_stub_status_add_variables, /* preconfiguration */ |
| 509 | 36 NULL, /* postconfiguration */ |
| 487 | 37 |
| 38 NULL, /* create main configuration */ | |
| 39 NULL, /* init main configuration */ | |
| 577 | 40 |
| 487 | 41 NULL, /* create server configuration */ |
| 42 NULL, /* merge server configuration */ | |
| 577 | 43 |
| 487 | 44 NULL, /* create location configuration */ |
| 45 NULL /* merge location configuration */ | |
| 46 }; | |
| 47 | |
| 48 | |
| 49 ngx_module_t ngx_http_stub_status_module = { | |
| 509 | 50 NGX_MODULE_V1, |
| 487 | 51 &ngx_http_stub_status_module_ctx, /* module context */ |
| 52 ngx_http_status_commands, /* module directives */ | |
| 53 NGX_HTTP_MODULE, /* module type */ | |
| 541 | 54 NULL, /* init master */ |
| 487 | 55 NULL, /* init module */ |
| 541 | 56 NULL, /* init process */ |
| 57 NULL, /* init thread */ | |
| 58 NULL, /* exit thread */ | |
| 59 NULL, /* exit process */ | |
| 60 NULL, /* exit master */ | |
| 61 NGX_MODULE_V1_PADDING | |
| 487 | 62 }; |
| 63 | |
| 64 | |
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65 static ngx_http_variable_t ngx_http_stub_status_vars[] = { |
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66 |
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67 { ngx_string("connections_active"), NULL, ngx_http_stub_status_variable, |
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68 0, NGX_HTTP_VAR_NOCACHEABLE, 0 }, |
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69 |
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70 { ngx_string("connections_reading"), NULL, ngx_http_stub_status_variable, |
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71 1, NGX_HTTP_VAR_NOCACHEABLE, 0 }, |
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72 |
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73 { ngx_string("connections_writing"), NULL, ngx_http_stub_status_variable, |
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74 2, NGX_HTTP_VAR_NOCACHEABLE, 0 }, |
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75 |
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76 { ngx_string("connections_waiting"), NULL, ngx_http_stub_status_variable, |
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77 3, NGX_HTTP_VAR_NOCACHEABLE, 0 }, |
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78 |
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79 ngx_http_null_variable |
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80 }; |
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81 |
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82 |
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83 static ngx_int_t |
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84 ngx_http_stub_status_handler(ngx_http_request_t *r) |
| 487 | 85 { |
| 495 | 86 size_t size; |
| 87 ngx_int_t rc; | |
| 88 ngx_buf_t *b; | |
| 89 ngx_chain_t out; | |
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90 ngx_atomic_int_t ap, hn, ac, rq, rd, wr, wa; |
| 577 | 91 |
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92 if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) { |
| 487 | 93 return NGX_HTTP_NOT_ALLOWED; |
| 94 } | |
| 95 | |
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96 rc = ngx_http_discard_request_body(r); |
| 487 | 97 |
| 1374 | 98 if (rc != NGX_OK) { |
| 487 | 99 return rc; |
| 100 } | |
| 101 | |
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102 r->headers_out.content_type_len = sizeof("text/plain") - 1; |
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103 ngx_str_set(&r->headers_out.content_type, "text/plain"); |
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104 r->headers_out.content_type_lowcase = NULL; |
| 487 | 105 |
| 495 | 106 size = sizeof("Active connections: \n") + NGX_ATOMIC_T_LEN |
| 487 | 107 + sizeof("server accepts handled requests\n") - 1 |
| 495 | 108 + 6 + 3 * NGX_ATOMIC_T_LEN |
| 109 + sizeof("Reading: Writing: Waiting: \n") + 3 * NGX_ATOMIC_T_LEN; | |
| 487 | 110 |
| 501 | 111 b = ngx_create_temp_buf(r->pool, size); |
| 112 if (b == NULL) { | |
| 487 | 113 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
| 114 } | |
| 115 | |
| 116 out.buf = b; | |
| 117 out.next = NULL; | |
| 118 | |
| 119 ap = *ngx_stat_accepted; | |
| 495 | 120 hn = *ngx_stat_handled; |
| 487 | 121 ac = *ngx_stat_active; |
| 122 rq = *ngx_stat_requests; | |
| 123 rd = *ngx_stat_reading; | |
| 124 wr = *ngx_stat_writing; | |
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125 wa = *ngx_stat_waiting; |
| 487 | 126 |
| 509 | 127 b->last = ngx_sprintf(b->last, "Active connections: %uA \n", ac); |
| 487 | 128 |
| 129 b->last = ngx_cpymem(b->last, "server accepts handled requests\n", | |
| 130 sizeof("server accepts handled requests\n") - 1); | |
| 131 | |
| 509 | 132 b->last = ngx_sprintf(b->last, " %uA %uA %uA \n", ap, hn, rq); |
| 487 | 133 |
| 509 | 134 b->last = ngx_sprintf(b->last, "Reading: %uA Writing: %uA Waiting: %uA \n", |
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135 rd, wr, wa); |
| 487 | 136 |
| 137 r->headers_out.status = NGX_HTTP_OK; | |
| 138 r->headers_out.content_length_n = b->last - b->pos; | |
| 139 | |
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140 b->last_buf = (r == r->main) ? 1 : 0; |
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141 b->last_in_chain = 1; |
| 487 | 142 |
| 143 rc = ngx_http_send_header(r); | |
| 144 | |
| 145 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { | |
| 146 return rc; | |
| 147 } | |
| 148 | |
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149 return ngx_http_output_filter(r, &out); |
| 487 | 150 } |
| 151 | |
| 152 | |
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153 static ngx_int_t |
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154 ngx_http_stub_status_variable(ngx_http_request_t *r, |
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155 ngx_http_variable_value_t *v, uintptr_t data) |
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156 { |
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157 u_char *p; |
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158 ngx_atomic_int_t value; |
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159 |
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160 p = ngx_pnalloc(r->pool, NGX_ATOMIC_T_LEN); |
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161 if (p == NULL) { |
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162 return NGX_ERROR; |
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163 } |
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164 |
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165 switch (data) { |
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166 case 0: |
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167 value = *ngx_stat_active; |
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168 break; |
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169 |
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170 case 1: |
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171 value = *ngx_stat_reading; |
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172 break; |
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173 |
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174 case 2: |
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175 value = *ngx_stat_writing; |
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176 break; |
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177 |
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178 case 3: |
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179 value = *ngx_stat_waiting; |
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180 break; |
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181 |
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182 /* suppress warning */ |
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183 default: |
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184 value = 0; |
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185 break; |
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186 } |
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187 |
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188 v->len = ngx_sprintf(p, "%uA", value) - p; |
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189 v->valid = 1; |
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190 v->no_cacheable = 0; |
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191 v->not_found = 0; |
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192 v->data = p; |
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193 |
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194 return NGX_OK; |
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195 } |
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196 |
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197 |
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198 static ngx_int_t |
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199 ngx_http_stub_status_add_variables(ngx_conf_t *cf) |
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200 { |
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201 ngx_http_variable_t *var, *v; |
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202 |
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203 for (v = ngx_http_stub_status_vars; v->name.len; v++) { |
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204 var = ngx_http_add_variable(cf, &v->name, v->flags); |
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205 if (var == NULL) { |
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206 return NGX_ERROR; |
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207 } |
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208 |
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209 var->get_handler = v->get_handler; |
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210 var->data = v->data; |
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211 } |
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212 |
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213 return NGX_OK; |
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214 } |
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215 |
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216 |
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217 static char * |
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218 ngx_http_set_stub_status(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 487 | 219 { |
| 220 ngx_http_core_loc_conf_t *clcf; | |
| 221 | |
| 222 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); | |
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223 clcf->handler = ngx_http_stub_status_handler; |
| 487 | 224 |
| 225 return NGX_CONF_OK; | |
| 226 } |