Mercurial > hg > nginx
comparison src/stream/ngx_stream_limit_conn_module.c @ 6197:0dcef374b8bb
Stream: connection limiting module.
stream {
limit_conn_zone $binary_remote_addr zone=perip:1m;
limit_conn_log_level error;
server {
...
limit_conn perip 1;
}
}
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Thu, 18 Jun 2015 14:17:30 +0300 |
parents | |
children | f01ab2dbcfdc |
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6196:c3ec43580a48 | 6197:0dcef374b8bb |
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1 | |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 * Copyright (C) Nginx, Inc. | |
5 */ | |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_stream.h> | |
11 | |
12 | |
13 typedef struct { | |
14 u_char color; | |
15 u_char len; | |
16 u_short conn; | |
17 u_char data[1]; | |
18 } ngx_stream_limit_conn_node_t; | |
19 | |
20 | |
21 typedef struct { | |
22 ngx_shm_zone_t *shm_zone; | |
23 ngx_rbtree_node_t *node; | |
24 } ngx_stream_limit_conn_cleanup_t; | |
25 | |
26 | |
27 typedef struct { | |
28 ngx_rbtree_t *rbtree; | |
29 } ngx_stream_limit_conn_ctx_t; | |
30 | |
31 | |
32 typedef struct { | |
33 ngx_shm_zone_t *shm_zone; | |
34 ngx_uint_t conn; | |
35 } ngx_stream_limit_conn_limit_t; | |
36 | |
37 | |
38 typedef struct { | |
39 ngx_array_t limits; | |
40 ngx_uint_t log_level; | |
41 } ngx_stream_limit_conn_conf_t; | |
42 | |
43 | |
44 static ngx_rbtree_node_t *ngx_stream_limit_conn_lookup(ngx_rbtree_t *rbtree, | |
45 ngx_str_t *key, uint32_t hash); | |
46 static void ngx_stream_limit_conn_cleanup(void *data); | |
47 static ngx_inline void ngx_stream_limit_conn_cleanup_all(ngx_pool_t *pool); | |
48 | |
49 static void *ngx_stream_limit_conn_create_conf(ngx_conf_t *cf); | |
50 static char *ngx_stream_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, | |
51 void *child); | |
52 static char *ngx_stream_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, | |
53 void *conf); | |
54 static char *ngx_stream_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, | |
55 void *conf); | |
56 static ngx_int_t ngx_stream_limit_conn_init(ngx_conf_t *cf); | |
57 | |
58 | |
59 static ngx_conf_enum_t ngx_stream_limit_conn_log_levels[] = { | |
60 { ngx_string("info"), NGX_LOG_INFO }, | |
61 { ngx_string("notice"), NGX_LOG_NOTICE }, | |
62 { ngx_string("warn"), NGX_LOG_WARN }, | |
63 { ngx_string("error"), NGX_LOG_ERR }, | |
64 { ngx_null_string, 0 } | |
65 }; | |
66 | |
67 | |
68 static ngx_command_t ngx_stream_limit_conn_commands[] = { | |
69 | |
70 { ngx_string("limit_conn_zone"), | |
71 NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE2, | |
72 ngx_stream_limit_conn_zone, | |
73 0, | |
74 0, | |
75 NULL }, | |
76 | |
77 { ngx_string("limit_conn"), | |
78 NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE2, | |
79 ngx_stream_limit_conn, | |
80 NGX_STREAM_SRV_CONF_OFFSET, | |
81 0, | |
82 NULL }, | |
83 | |
84 { ngx_string("limit_conn_log_level"), | |
85 NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, | |
86 ngx_conf_set_enum_slot, | |
87 NGX_STREAM_SRV_CONF_OFFSET, | |
88 offsetof(ngx_stream_limit_conn_conf_t, log_level), | |
89 &ngx_stream_limit_conn_log_levels }, | |
90 | |
91 ngx_null_command | |
92 }; | |
93 | |
94 | |
95 static ngx_stream_module_t ngx_stream_limit_conn_module_ctx = { | |
96 ngx_stream_limit_conn_init, /* postconfiguration */ | |
97 | |
98 NULL, /* create main configuration */ | |
99 NULL, /* init main configuration */ | |
100 | |
101 ngx_stream_limit_conn_create_conf, /* create server configuration */ | |
102 ngx_stream_limit_conn_merge_conf, /* merge server configuration */ | |
103 }; | |
104 | |
105 | |
106 ngx_module_t ngx_stream_limit_conn_module = { | |
107 NGX_MODULE_V1, | |
108 &ngx_stream_limit_conn_module_ctx, /* module context */ | |
109 ngx_stream_limit_conn_commands, /* module directives */ | |
110 NGX_STREAM_MODULE, /* module type */ | |
111 NULL, /* init master */ | |
112 NULL, /* init module */ | |
113 NULL, /* init process */ | |
114 NULL, /* init thread */ | |
115 NULL, /* exit thread */ | |
116 NULL, /* exit process */ | |
117 NULL, /* exit master */ | |
118 NGX_MODULE_V1_PADDING | |
119 }; | |
120 | |
121 | |
122 static ngx_int_t | |
123 ngx_stream_limit_conn_handler(ngx_stream_session_t *s) | |
124 { | |
125 size_t n; | |
126 uint32_t hash; | |
127 ngx_str_t key; | |
128 ngx_uint_t i; | |
129 ngx_slab_pool_t *shpool; | |
130 ngx_rbtree_node_t *node; | |
131 ngx_pool_cleanup_t *cln; | |
132 struct sockaddr_in *sin; | |
133 #if (NGX_HAVE_INET6) | |
134 struct sockaddr_in6 *sin6; | |
135 #endif | |
136 ngx_stream_limit_conn_ctx_t *ctx; | |
137 ngx_stream_limit_conn_node_t *lc; | |
138 ngx_stream_limit_conn_conf_t *lccf; | |
139 ngx_stream_limit_conn_limit_t *limits; | |
140 ngx_stream_limit_conn_cleanup_t *lccln; | |
141 | |
142 switch (s->connection->sockaddr->sa_family) { | |
143 | |
144 case AF_INET: | |
145 sin = (struct sockaddr_in *) s->connection->sockaddr; | |
146 | |
147 key.len = sizeof(in_addr_t); | |
148 key.data = (u_char *) &sin->sin_addr; | |
149 | |
150 break; | |
151 | |
152 #if (NGX_HAVE_INET6) | |
153 case AF_INET6: | |
154 sin6 = (struct sockaddr_in6 *) s->connection->sockaddr; | |
155 | |
156 key.len = sizeof(struct in6_addr); | |
157 key.data = sin6->sin6_addr.s6_addr; | |
158 | |
159 break; | |
160 #endif | |
161 | |
162 default: | |
163 return NGX_DECLINED; | |
164 } | |
165 | |
166 hash = ngx_crc32_short(key.data, key.len); | |
167 | |
168 lccf = ngx_stream_get_module_srv_conf(s, ngx_stream_limit_conn_module); | |
169 limits = lccf->limits.elts; | |
170 | |
171 for (i = 0; i < lccf->limits.nelts; i++) { | |
172 ctx = limits[i].shm_zone->data; | |
173 | |
174 shpool = (ngx_slab_pool_t *) limits[i].shm_zone->shm.addr; | |
175 | |
176 ngx_shmtx_lock(&shpool->mutex); | |
177 | |
178 node = ngx_stream_limit_conn_lookup(ctx->rbtree, &key, hash); | |
179 | |
180 if (node == NULL) { | |
181 | |
182 n = offsetof(ngx_rbtree_node_t, color) | |
183 + offsetof(ngx_stream_limit_conn_node_t, data) | |
184 + key.len; | |
185 | |
186 node = ngx_slab_alloc_locked(shpool, n); | |
187 | |
188 if (node == NULL) { | |
189 ngx_shmtx_unlock(&shpool->mutex); | |
190 ngx_stream_limit_conn_cleanup_all(s->connection->pool); | |
191 return NGX_ABORT; | |
192 } | |
193 | |
194 lc = (ngx_stream_limit_conn_node_t *) &node->color; | |
195 | |
196 node->key = hash; | |
197 lc->len = (u_char) key.len; | |
198 lc->conn = 1; | |
199 ngx_memcpy(lc->data, key.data, key.len); | |
200 | |
201 ngx_rbtree_insert(ctx->rbtree, node); | |
202 | |
203 } else { | |
204 | |
205 lc = (ngx_stream_limit_conn_node_t *) &node->color; | |
206 | |
207 if ((ngx_uint_t) lc->conn >= limits[i].conn) { | |
208 | |
209 ngx_shmtx_unlock(&shpool->mutex); | |
210 | |
211 ngx_log_error(lccf->log_level, s->connection->log, 0, | |
212 "limiting connections by zone \"%V\"", | |
213 &limits[i].shm_zone->shm.name); | |
214 | |
215 ngx_stream_limit_conn_cleanup_all(s->connection->pool); | |
216 return NGX_ABORT; | |
217 } | |
218 | |
219 lc->conn++; | |
220 } | |
221 | |
222 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, | |
223 "limit conn: %08XD %d", node->key, lc->conn); | |
224 | |
225 ngx_shmtx_unlock(&shpool->mutex); | |
226 | |
227 cln = ngx_pool_cleanup_add(s->connection->pool, | |
228 sizeof(ngx_stream_limit_conn_cleanup_t)); | |
229 if (cln == NULL) { | |
230 return NGX_ERROR; | |
231 } | |
232 | |
233 cln->handler = ngx_stream_limit_conn_cleanup; | |
234 lccln = cln->data; | |
235 | |
236 lccln->shm_zone = limits[i].shm_zone; | |
237 lccln->node = node; | |
238 } | |
239 | |
240 return NGX_DECLINED; | |
241 } | |
242 | |
243 | |
244 static void | |
245 ngx_stream_limit_conn_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
246 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
247 { | |
248 ngx_rbtree_node_t **p; | |
249 ngx_stream_limit_conn_node_t *lcn, *lcnt; | |
250 | |
251 for ( ;; ) { | |
252 | |
253 if (node->key < temp->key) { | |
254 | |
255 p = &temp->left; | |
256 | |
257 } else if (node->key > temp->key) { | |
258 | |
259 p = &temp->right; | |
260 | |
261 } else { /* node->key == temp->key */ | |
262 | |
263 lcn = (ngx_stream_limit_conn_node_t *) &node->color; | |
264 lcnt = (ngx_stream_limit_conn_node_t *) &temp->color; | |
265 | |
266 p = (ngx_memn2cmp(lcn->data, lcnt->data, lcn->len, lcnt->len) < 0) | |
267 ? &temp->left : &temp->right; | |
268 } | |
269 | |
270 if (*p == sentinel) { | |
271 break; | |
272 } | |
273 | |
274 temp = *p; | |
275 } | |
276 | |
277 *p = node; | |
278 node->parent = temp; | |
279 node->left = sentinel; | |
280 node->right = sentinel; | |
281 ngx_rbt_red(node); | |
282 } | |
283 | |
284 | |
285 static ngx_rbtree_node_t * | |
286 ngx_stream_limit_conn_lookup(ngx_rbtree_t *rbtree, ngx_str_t *key, | |
287 uint32_t hash) | |
288 { | |
289 ngx_int_t rc; | |
290 ngx_rbtree_node_t *node, *sentinel; | |
291 ngx_stream_limit_conn_node_t *lcn; | |
292 | |
293 node = rbtree->root; | |
294 sentinel = rbtree->sentinel; | |
295 | |
296 while (node != sentinel) { | |
297 | |
298 if (hash < node->key) { | |
299 node = node->left; | |
300 continue; | |
301 } | |
302 | |
303 if (hash > node->key) { | |
304 node = node->right; | |
305 continue; | |
306 } | |
307 | |
308 /* hash == node->key */ | |
309 | |
310 lcn = (ngx_stream_limit_conn_node_t *) &node->color; | |
311 | |
312 rc = ngx_memn2cmp(key->data, lcn->data, key->len, (size_t) lcn->len); | |
313 | |
314 if (rc == 0) { | |
315 return node; | |
316 } | |
317 | |
318 node = (rc < 0) ? node->left : node->right; | |
319 } | |
320 | |
321 return NULL; | |
322 } | |
323 | |
324 | |
325 static void | |
326 ngx_stream_limit_conn_cleanup(void *data) | |
327 { | |
328 ngx_stream_limit_conn_cleanup_t *lccln = data; | |
329 | |
330 ngx_slab_pool_t *shpool; | |
331 ngx_rbtree_node_t *node; | |
332 ngx_stream_limit_conn_ctx_t *ctx; | |
333 ngx_stream_limit_conn_node_t *lc; | |
334 | |
335 ctx = lccln->shm_zone->data; | |
336 shpool = (ngx_slab_pool_t *) lccln->shm_zone->shm.addr; | |
337 node = lccln->node; | |
338 lc = (ngx_stream_limit_conn_node_t *) &node->color; | |
339 | |
340 ngx_shmtx_lock(&shpool->mutex); | |
341 | |
342 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, lccln->shm_zone->shm.log, 0, | |
343 "limit conn cleanup: %08XD %d", node->key, lc->conn); | |
344 | |
345 lc->conn--; | |
346 | |
347 if (lc->conn == 0) { | |
348 ngx_rbtree_delete(ctx->rbtree, node); | |
349 ngx_slab_free_locked(shpool, node); | |
350 } | |
351 | |
352 ngx_shmtx_unlock(&shpool->mutex); | |
353 } | |
354 | |
355 | |
356 static ngx_inline void | |
357 ngx_stream_limit_conn_cleanup_all(ngx_pool_t *pool) | |
358 { | |
359 ngx_pool_cleanup_t *cln; | |
360 | |
361 cln = pool->cleanup; | |
362 | |
363 while (cln && cln->handler == ngx_stream_limit_conn_cleanup) { | |
364 ngx_stream_limit_conn_cleanup(cln->data); | |
365 cln = cln->next; | |
366 } | |
367 | |
368 pool->cleanup = cln; | |
369 } | |
370 | |
371 | |
372 static ngx_int_t | |
373 ngx_stream_limit_conn_init_zone(ngx_shm_zone_t *shm_zone, void *data) | |
374 { | |
375 ngx_stream_limit_conn_ctx_t *octx = data; | |
376 | |
377 size_t len; | |
378 ngx_slab_pool_t *shpool; | |
379 ngx_rbtree_node_t *sentinel; | |
380 ngx_stream_limit_conn_ctx_t *ctx; | |
381 | |
382 ctx = shm_zone->data; | |
383 | |
384 if (octx) { | |
385 ctx->rbtree = octx->rbtree; | |
386 | |
387 return NGX_OK; | |
388 } | |
389 | |
390 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; | |
391 | |
392 if (shm_zone->shm.exists) { | |
393 ctx->rbtree = shpool->data; | |
394 | |
395 return NGX_OK; | |
396 } | |
397 | |
398 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); | |
399 if (ctx->rbtree == NULL) { | |
400 return NGX_ERROR; | |
401 } | |
402 | |
403 shpool->data = ctx->rbtree; | |
404 | |
405 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); | |
406 if (sentinel == NULL) { | |
407 return NGX_ERROR; | |
408 } | |
409 | |
410 ngx_rbtree_init(ctx->rbtree, sentinel, | |
411 ngx_stream_limit_conn_rbtree_insert_value); | |
412 | |
413 len = sizeof(" in limit_conn_zone \"\"") + shm_zone->shm.name.len; | |
414 | |
415 shpool->log_ctx = ngx_slab_alloc(shpool, len); | |
416 if (shpool->log_ctx == NULL) { | |
417 return NGX_ERROR; | |
418 } | |
419 | |
420 ngx_sprintf(shpool->log_ctx, " in limit_conn_zone \"%V\"%Z", | |
421 &shm_zone->shm.name); | |
422 | |
423 return NGX_OK; | |
424 } | |
425 | |
426 | |
427 static void * | |
428 ngx_stream_limit_conn_create_conf(ngx_conf_t *cf) | |
429 { | |
430 ngx_stream_limit_conn_conf_t *conf; | |
431 | |
432 conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_limit_conn_conf_t)); | |
433 if (conf == NULL) { | |
434 return NULL; | |
435 } | |
436 | |
437 /* | |
438 * set by ngx_pcalloc(): | |
439 * | |
440 * conf->limits.elts = NULL; | |
441 */ | |
442 | |
443 conf->log_level = NGX_CONF_UNSET_UINT; | |
444 | |
445 return conf; | |
446 } | |
447 | |
448 | |
449 static char * | |
450 ngx_stream_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
451 { | |
452 ngx_stream_limit_conn_conf_t *prev = parent; | |
453 ngx_stream_limit_conn_conf_t *conf = child; | |
454 | |
455 if (conf->limits.elts == NULL) { | |
456 conf->limits = prev->limits; | |
457 } | |
458 | |
459 ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR); | |
460 | |
461 return NGX_CONF_OK; | |
462 } | |
463 | |
464 | |
465 static char * | |
466 ngx_stream_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
467 { | |
468 u_char *p; | |
469 ssize_t size; | |
470 ngx_str_t *value, name, s; | |
471 ngx_uint_t i; | |
472 ngx_shm_zone_t *shm_zone; | |
473 ngx_stream_limit_conn_ctx_t *ctx; | |
474 | |
475 value = cf->args->elts; | |
476 | |
477 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_stream_limit_conn_ctx_t)); | |
478 if (ctx == NULL) { | |
479 return NGX_CONF_ERROR; | |
480 } | |
481 | |
482 size = 0; | |
483 name.len = 0; | |
484 | |
485 for (i = 2; i < cf->args->nelts; i++) { | |
486 | |
487 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
488 | |
489 name.data = value[i].data + 5; | |
490 | |
491 p = (u_char *) ngx_strchr(name.data, ':'); | |
492 | |
493 if (p == NULL) { | |
494 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
495 "invalid zone size \"%V\"", &value[i]); | |
496 return NGX_CONF_ERROR; | |
497 } | |
498 | |
499 name.len = p - name.data; | |
500 | |
501 s.data = p + 1; | |
502 s.len = value[i].data + value[i].len - s.data; | |
503 | |
504 size = ngx_parse_size(&s); | |
505 | |
506 if (size == NGX_ERROR) { | |
507 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
508 "invalid zone size \"%V\"", &value[i]); | |
509 return NGX_CONF_ERROR; | |
510 } | |
511 | |
512 if (size < (ssize_t) (8 * ngx_pagesize)) { | |
513 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
514 "zone \"%V\" is too small", &value[i]); | |
515 return NGX_CONF_ERROR; | |
516 } | |
517 | |
518 continue; | |
519 } | |
520 | |
521 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
522 "invalid parameter \"%V\"", &value[i]); | |
523 return NGX_CONF_ERROR; | |
524 } | |
525 | |
526 if (name.len == 0) { | |
527 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
528 "\"%V\" must have \"zone\" parameter", | |
529 &cmd->name); | |
530 return NGX_CONF_ERROR; | |
531 } | |
532 | |
533 shm_zone = ngx_shared_memory_add(cf, &name, size, | |
534 &ngx_stream_limit_conn_module); | |
535 if (shm_zone == NULL) { | |
536 return NGX_CONF_ERROR; | |
537 } | |
538 | |
539 if (shm_zone->data) { | |
540 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
541 "%V \"%V\" is already bound to key " | |
542 "\"$binary_remote_addr\"", | |
543 &cmd->name, &name); | |
544 return NGX_CONF_ERROR; | |
545 } | |
546 | |
547 if (ngx_strcmp(value[1].data, "$binary_remote_addr") != 0) { | |
548 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
549 "unsupported key \"%V\", use " | |
550 "$binary_remote_addr", &value[1]); | |
551 return NGX_CONF_ERROR; | |
552 } | |
553 | |
554 shm_zone->init = ngx_stream_limit_conn_init_zone; | |
555 shm_zone->data = ctx; | |
556 | |
557 return NGX_CONF_OK; | |
558 } | |
559 | |
560 | |
561 static char * | |
562 ngx_stream_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
563 { | |
564 ngx_shm_zone_t *shm_zone; | |
565 ngx_stream_limit_conn_conf_t *lccf = conf; | |
566 ngx_stream_limit_conn_limit_t *limit, *limits; | |
567 | |
568 ngx_str_t *value; | |
569 ngx_int_t n; | |
570 ngx_uint_t i; | |
571 | |
572 value = cf->args->elts; | |
573 | |
574 shm_zone = ngx_shared_memory_add(cf, &value[1], 0, | |
575 &ngx_stream_limit_conn_module); | |
576 if (shm_zone == NULL) { | |
577 return NGX_CONF_ERROR; | |
578 } | |
579 | |
580 limits = lccf->limits.elts; | |
581 | |
582 if (limits == NULL) { | |
583 if (ngx_array_init(&lccf->limits, cf->pool, 1, | |
584 sizeof(ngx_stream_limit_conn_limit_t)) | |
585 != NGX_OK) | |
586 { | |
587 return NGX_CONF_ERROR; | |
588 } | |
589 } | |
590 | |
591 for (i = 0; i < lccf->limits.nelts; i++) { | |
592 if (shm_zone == limits[i].shm_zone) { | |
593 return "is duplicate"; | |
594 } | |
595 } | |
596 | |
597 n = ngx_atoi(value[2].data, value[2].len); | |
598 if (n <= 0) { | |
599 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
600 "invalid number of connections \"%V\"", &value[2]); | |
601 return NGX_CONF_ERROR; | |
602 } | |
603 | |
604 if (n > 65535) { | |
605 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
606 "connection limit must be less 65536"); | |
607 return NGX_CONF_ERROR; | |
608 } | |
609 | |
610 limit = ngx_array_push(&lccf->limits); | |
611 if (limit == NULL) { | |
612 return NGX_CONF_ERROR; | |
613 } | |
614 | |
615 limit->conn = n; | |
616 limit->shm_zone = shm_zone; | |
617 | |
618 return NGX_CONF_OK; | |
619 } | |
620 | |
621 | |
622 static ngx_int_t | |
623 ngx_stream_limit_conn_init(ngx_conf_t *cf) | |
624 { | |
625 ngx_stream_core_main_conf_t *cmcf; | |
626 | |
627 cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module); | |
628 | |
629 cmcf->limit_conn_handler = ngx_stream_limit_conn_handler; | |
630 | |
631 return NGX_OK; | |
632 } |