Mercurial > hg > nginx-quic
view src/http/modules/ngx_http_upstream_ip_hash_module.c @ 8551:c35b255d80dc quic
HTTP/3: close connection on keepalive_requests * 2.
After receiving GOAWAY, client is not supposed to create new streams. However,
until client reads this frame, we allow it to create new streams, which are
gracefully rejected. To prevent client from abusing this algorithm, a new
limit is introduced. Upon reaching keepalive_requests * 2, server now closes
the entire QUIC connection claiming excessive load.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Thu, 29 Jul 2021 16:01:37 +0300 |
parents | ed599ea6c1f1 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { /* the round robin data must be first */ ngx_http_upstream_rr_peer_data_t rrp; ngx_uint_t hash; u_char addrlen; u_char *addr; u_char tries; ngx_event_get_peer_pt get_rr_peer; } ngx_http_upstream_ip_hash_peer_data_t; static ngx_int_t ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r, ngx_http_upstream_srv_conf_t *us); static ngx_int_t ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data); static char *ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_command_t ngx_http_upstream_ip_hash_commands[] = { { ngx_string("ip_hash"), NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS, ngx_http_upstream_ip_hash, 0, 0, NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_upstream_ip_hash_module_ctx = { NULL, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ NULL, /* create location configuration */ NULL /* merge location configuration */ }; ngx_module_t ngx_http_upstream_ip_hash_module = { NGX_MODULE_V1, &ngx_http_upstream_ip_hash_module_ctx, /* module context */ ngx_http_upstream_ip_hash_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static u_char ngx_http_upstream_ip_hash_pseudo_addr[3]; static ngx_int_t ngx_http_upstream_init_ip_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us) { if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) { return NGX_ERROR; } us->peer.init = ngx_http_upstream_init_ip_hash_peer; return NGX_OK; } static ngx_int_t ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r, ngx_http_upstream_srv_conf_t *us) { struct sockaddr_in *sin; #if (NGX_HAVE_INET6) struct sockaddr_in6 *sin6; #endif ngx_http_upstream_ip_hash_peer_data_t *iphp; iphp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_ip_hash_peer_data_t)); if (iphp == NULL) { return NGX_ERROR; } r->upstream->peer.data = &iphp->rrp; if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) { return NGX_ERROR; } r->upstream->peer.get = ngx_http_upstream_get_ip_hash_peer; switch (r->connection->sockaddr->sa_family) { case AF_INET: sin = (struct sockaddr_in *) r->connection->sockaddr; iphp->addr = (u_char *) &sin->sin_addr.s_addr; iphp->addrlen = 3; break; #if (NGX_HAVE_INET6) case AF_INET6: sin6 = (struct sockaddr_in6 *) r->connection->sockaddr; iphp->addr = (u_char *) &sin6->sin6_addr.s6_addr; iphp->addrlen = 16; break; #endif default: iphp->addr = ngx_http_upstream_ip_hash_pseudo_addr; iphp->addrlen = 3; } iphp->hash = 89; iphp->tries = 0; iphp->get_rr_peer = ngx_http_upstream_get_round_robin_peer; return NGX_OK; } static ngx_int_t ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data) { ngx_http_upstream_ip_hash_peer_data_t *iphp = data; time_t now; ngx_int_t w; uintptr_t m; ngx_uint_t i, n, p, hash; ngx_http_upstream_rr_peer_t *peer; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, "get ip hash peer, try: %ui", pc->tries); /* TODO: cached */ ngx_http_upstream_rr_peers_rlock(iphp->rrp.peers); if (iphp->tries > 20 || iphp->rrp.peers->single) { ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers); return iphp->get_rr_peer(pc, &iphp->rrp); } now = ngx_time(); pc->cached = 0; pc->connection = NULL; hash = iphp->hash; for ( ;; ) { for (i = 0; i < (ngx_uint_t) iphp->addrlen; i++) { hash = (hash * 113 + iphp->addr[i]) % 6271; } w = hash % iphp->rrp.peers->total_weight; peer = iphp->rrp.peers->peer; p = 0; while (w >= peer->weight) { w -= peer->weight; peer = peer->next; p++; } n = p / (8 * sizeof(uintptr_t)); m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t)); if (iphp->rrp.tried[n] & m) { goto next; } ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, "get ip hash peer, hash: %ui %04XL", p, (uint64_t) m); ngx_http_upstream_rr_peer_lock(iphp->rrp.peers, peer); if (peer->down) { ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer); goto next; } if (peer->max_fails && peer->fails >= peer->max_fails && now - peer->checked <= peer->fail_timeout) { ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer); goto next; } if (peer->max_conns && peer->conns >= peer->max_conns) { ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer); goto next; } break; next: if (++iphp->tries > 20) { ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers); return iphp->get_rr_peer(pc, &iphp->rrp); } } iphp->rrp.current = peer; pc->sockaddr = peer->sockaddr; pc->socklen = peer->socklen; pc->name = &peer->name; peer->conns++; if (now - peer->checked > peer->fail_timeout) { peer->checked = now; } ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer); ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers); iphp->rrp.tried[n] |= m; iphp->hash = hash; return NGX_OK; } static char * ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_upstream_srv_conf_t *uscf; uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module); if (uscf->peer.init_upstream) { ngx_conf_log_error(NGX_LOG_WARN, cf, 0, "load balancing method redefined"); } uscf->peer.init_upstream = ngx_http_upstream_init_ip_hash; uscf->flags = NGX_HTTP_UPSTREAM_CREATE |NGX_HTTP_UPSTREAM_WEIGHT |NGX_HTTP_UPSTREAM_MAX_CONNS |NGX_HTTP_UPSTREAM_MAX_FAILS |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT |NGX_HTTP_UPSTREAM_DOWN; return NGX_CONF_OK; }