| |
| /* |
| * Copyright (C) Igor Sysoev |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_event.h> |
| |
| |
| static ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle, ngx_uint_t all); |
| #if (NGX_HAVE_EPOLLEXCLUSIVE) |
| static void ngx_reorder_accept_events(ngx_listening_t *ls); |
| #endif |
| static void ngx_close_accepted_connection(ngx_connection_t *c); |
| |
| |
| void |
| ngx_event_accept(ngx_event_t *ev) |
| { |
| socklen_t socklen; |
| ngx_err_t err; |
| ngx_log_t *log; |
| ngx_uint_t level; |
| ngx_socket_t s; |
| ngx_event_t *rev, *wev; |
| ngx_sockaddr_t sa; |
| ngx_listening_t *ls; |
| ngx_connection_t *c, *lc; |
| ngx_event_conf_t *ecf; |
| #if (NGX_HAVE_ACCEPT4) |
| static ngx_uint_t use_accept4 = 1; |
| #endif |
| |
| if (ev->timedout) { |
| if (ngx_enable_accept_events((ngx_cycle_t *) ngx_cycle) != NGX_OK) { |
| return; |
| } |
| |
| ev->timedout = 0; |
| } |
| |
| ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module); |
| |
| if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) { |
| ev->available = ecf->multi_accept; |
| } |
| |
| lc = ev->data; |
| ls = lc->listening; |
| ev->ready = 0; |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, |
| "accept on %V, ready: %d", &ls->addr_text, ev->available); |
| |
| do { |
| socklen = sizeof(ngx_sockaddr_t); |
| |
| #if (NGX_HAVE_ACCEPT4) |
| if (use_accept4) { |
| s = accept4(lc->fd, &sa.sockaddr, &socklen, SOCK_NONBLOCK); |
| } else { |
| s = accept(lc->fd, &sa.sockaddr, &socklen); |
| } |
| #else |
| s = accept(lc->fd, &sa.sockaddr, &socklen); |
| #endif |
| |
| if (s == (ngx_socket_t) -1) { |
| err = ngx_socket_errno; |
| |
| if (err == NGX_EAGAIN) { |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err, |
| "accept() not ready"); |
| return; |
| } |
| |
| level = NGX_LOG_ALERT; |
| |
| if (err == NGX_ECONNABORTED) { |
| level = NGX_LOG_ERR; |
| |
| } else if (err == NGX_EMFILE || err == NGX_ENFILE) { |
| level = NGX_LOG_CRIT; |
| } |
| |
| #if (NGX_HAVE_ACCEPT4) |
| ngx_log_error(level, ev->log, err, |
| use_accept4 ? "accept4() failed" : "accept() failed"); |
| |
| if (use_accept4 && err == NGX_ENOSYS) { |
| use_accept4 = 0; |
| ngx_inherited_nonblocking = 0; |
| continue; |
| } |
| #else |
| ngx_log_error(level, ev->log, err, "accept() failed"); |
| #endif |
| |
| if (err == NGX_ECONNABORTED) { |
| if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
| ev->available--; |
| } |
| |
| if (ev->available) { |
| continue; |
| } |
| } |
| |
| if (err == NGX_EMFILE || err == NGX_ENFILE) { |
| if (ngx_disable_accept_events((ngx_cycle_t *) ngx_cycle, 1) |
| != NGX_OK) |
| { |
| return; |
| } |
| |
| if (ngx_use_accept_mutex) { |
| if (ngx_accept_mutex_held) { |
| ngx_shmtx_unlock(&ngx_accept_mutex); |
| ngx_accept_mutex_held = 0; |
| } |
| |
| ngx_accept_disabled = 1; |
| |
| } else { |
| ngx_add_timer(ev, ecf->accept_mutex_delay); |
| } |
| } |
| |
| return; |
| } |
| |
| #if (NGX_STAT_STUB) |
| (void) ngx_atomic_fetch_add(ngx_stat_accepted, 1); |
| #endif |
| |
| ngx_accept_disabled = ngx_cycle->connection_n / 8 |
| - ngx_cycle->free_connection_n; |
| |
| c = ngx_get_connection(s, ev->log); |
| |
| if (c == NULL) { |
| if (ngx_close_socket(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno, |
| ngx_close_socket_n " failed"); |
| } |
| |
| return; |
| } |
| |
| c->type = SOCK_STREAM; |
| |
| #if (NGX_STAT_STUB) |
| (void) ngx_atomic_fetch_add(ngx_stat_active, 1); |
| #endif |
| |
| c->pool = ngx_create_pool(ls->pool_size, ev->log); |
| if (c->pool == NULL) { |
| ngx_close_accepted_connection(c); |
| return; |
| } |
| |
| if (socklen > (socklen_t) sizeof(ngx_sockaddr_t)) { |
| socklen = sizeof(ngx_sockaddr_t); |
| } |
| |
| c->sockaddr = ngx_palloc(c->pool, socklen); |
| if (c->sockaddr == NULL) { |
| ngx_close_accepted_connection(c); |
| return; |
| } |
| |
| ngx_memcpy(c->sockaddr, &sa, socklen); |
| |
| log = ngx_palloc(c->pool, sizeof(ngx_log_t)); |
| if (log == NULL) { |
| ngx_close_accepted_connection(c); |
| return; |
| } |
| |
| /* set a blocking mode for iocp and non-blocking mode for others */ |
| |
| if (ngx_inherited_nonblocking) { |
| if (ngx_event_flags & NGX_USE_IOCP_EVENT) { |
| if (ngx_blocking(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno, |
| ngx_blocking_n " failed"); |
| ngx_close_accepted_connection(c); |
| return; |
| } |
| } |
| |
| } else { |
| if (!(ngx_event_flags & NGX_USE_IOCP_EVENT)) { |
| if (ngx_nonblocking(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno, |
| ngx_nonblocking_n " failed"); |
| ngx_close_accepted_connection(c); |
| return; |
| } |
| } |
| } |
| |
| *log = ls->log; |
| |
| c->recv = ngx_recv; |
| c->send = ngx_send; |
| c->recv_chain = ngx_recv_chain; |
| c->send_chain = ngx_send_chain; |
| |
| c->log = log; |
| c->pool->log = log; |
| |
| c->socklen = socklen; |
| c->listening = ls; |
| c->local_sockaddr = ls->sockaddr; |
| c->local_socklen = ls->socklen; |
| |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| if (c->sockaddr->sa_family == AF_UNIX) { |
| c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED; |
| c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED; |
| #if (NGX_SOLARIS) |
| /* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */ |
| c->sendfile = 0; |
| #endif |
| } |
| #endif |
| |
| rev = c->read; |
| wev = c->write; |
| |
| wev->ready = 1; |
| |
| if (ngx_event_flags & NGX_USE_IOCP_EVENT) { |
| rev->ready = 1; |
| } |
| |
| if (ev->deferred_accept) { |
| rev->ready = 1; |
| #if (NGX_HAVE_KQUEUE || NGX_HAVE_EPOLLRDHUP) |
| rev->available = 1; |
| #endif |
| } |
| |
| rev->log = log; |
| wev->log = log; |
| |
| /* |
| * TODO: MT: - ngx_atomic_fetch_add() |
| * or protection by critical section or light mutex |
| * |
| * TODO: MP: - allocated in a shared memory |
| * - ngx_atomic_fetch_add() |
| * or protection by critical section or light mutex |
| */ |
| |
| c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); |
| |
| c->start_time = ngx_current_msec; |
| |
| #if (NGX_STAT_STUB) |
| (void) ngx_atomic_fetch_add(ngx_stat_handled, 1); |
| #endif |
| |
| if (ls->addr_ntop) { |
| c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len); |
| if (c->addr_text.data == NULL) { |
| ngx_close_accepted_connection(c); |
| return; |
| } |
| |
| c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->socklen, |
| c->addr_text.data, |
| ls->addr_text_max_len, 0); |
| if (c->addr_text.len == 0) { |
| ngx_close_accepted_connection(c); |
| return; |
| } |
| } |
| |
| #if (NGX_DEBUG) |
| { |
| ngx_str_t addr; |
| u_char text[NGX_SOCKADDR_STRLEN]; |
| |
| ngx_debug_accepted_connection(ecf, c); |
| |
| if (log->log_level & NGX_LOG_DEBUG_EVENT) { |
| addr.data = text; |
| addr.len = ngx_sock_ntop(c->sockaddr, c->socklen, text, |
| NGX_SOCKADDR_STRLEN, 1); |
| |
| ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0, |
| "*%uA accept: %V fd:%d", c->number, &addr, s); |
| } |
| |
| } |
| #endif |
| |
| if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) { |
| if (ngx_add_conn(c) == NGX_ERROR) { |
| ngx_close_accepted_connection(c); |
| return; |
| } |
| } |
| |
| log->data = NULL; |
| log->handler = NULL; |
| |
| ls->handler(c); |
| |
| if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
| ev->available--; |
| } |
| |
| } while (ev->available); |
| |
| #if (NGX_HAVE_EPOLLEXCLUSIVE) |
| ngx_reorder_accept_events(ls); |
| #endif |
| } |
| |
| |
| ngx_int_t |
| ngx_trylock_accept_mutex(ngx_cycle_t *cycle) |
| { |
| if (ngx_shmtx_trylock(&ngx_accept_mutex)) { |
| |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "accept mutex locked"); |
| |
| if (ngx_accept_mutex_held && ngx_accept_events == 0) { |
| return NGX_OK; |
| } |
| |
| if (ngx_enable_accept_events(cycle) == NGX_ERROR) { |
| ngx_shmtx_unlock(&ngx_accept_mutex); |
| return NGX_ERROR; |
| } |
| |
| ngx_accept_events = 0; |
| ngx_accept_mutex_held = 1; |
| |
| return NGX_OK; |
| } |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "accept mutex lock failed: %ui", ngx_accept_mutex_held); |
| |
| if (ngx_accept_mutex_held) { |
| if (ngx_disable_accept_events(cycle, 0) == NGX_ERROR) { |
| return NGX_ERROR; |
| } |
| |
| ngx_accept_mutex_held = 0; |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| ngx_int_t |
| ngx_enable_accept_events(ngx_cycle_t *cycle) |
| { |
| ngx_uint_t i; |
| ngx_listening_t *ls; |
| ngx_connection_t *c; |
| |
| ls = cycle->listening.elts; |
| for (i = 0; i < cycle->listening.nelts; i++) { |
| |
| c = ls[i].connection; |
| |
| if (c == NULL || c->read->active) { |
| continue; |
| } |
| |
| if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) { |
| return NGX_ERROR; |
| } |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_disable_accept_events(ngx_cycle_t *cycle, ngx_uint_t all) |
| { |
| ngx_uint_t i; |
| ngx_listening_t *ls; |
| ngx_connection_t *c; |
| |
| ls = cycle->listening.elts; |
| for (i = 0; i < cycle->listening.nelts; i++) { |
| |
| c = ls[i].connection; |
| |
| if (c == NULL || !c->read->active) { |
| continue; |
| } |
| |
| #if (NGX_HAVE_REUSEPORT) |
| |
| /* |
| * do not disable accept on worker's own sockets |
| * when disabling accept events due to accept mutex |
| */ |
| |
| if (ls[i].reuseport && !all) { |
| continue; |
| } |
| |
| #endif |
| |
| if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT) |
| == NGX_ERROR) |
| { |
| return NGX_ERROR; |
| } |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| #if (NGX_HAVE_EPOLLEXCLUSIVE) |
| |
| static void |
| ngx_reorder_accept_events(ngx_listening_t *ls) |
| { |
| ngx_connection_t *c; |
| |
| /* |
| * Linux with EPOLLEXCLUSIVE usually notifies only the process which |
| * was first to add the listening socket to the epoll instance. As |
| * a result most of the connections are handled by the first worker |
| * process. To fix this, we re-add the socket periodically, so other |
| * workers will get a chance to accept connections. |
| */ |
| |
| if (!ngx_use_exclusive_accept) { |
| return; |
| } |
| |
| #if (NGX_HAVE_REUSEPORT) |
| |
| if (ls->reuseport) { |
| return; |
| } |
| |
| #endif |
| |
| c = ls->connection; |
| |
| if (c->requests++ % 16 != 0 |
| && ngx_accept_disabled <= 0) |
| { |
| return; |
| } |
| |
| if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT) |
| == NGX_ERROR) |
| { |
| return; |
| } |
| |
| if (ngx_add_event(c->read, NGX_READ_EVENT, NGX_EXCLUSIVE_EVENT) |
| == NGX_ERROR) |
| { |
| return; |
| } |
| } |
| |
| #endif |
| |
| |
| static void |
| ngx_close_accepted_connection(ngx_connection_t *c) |
| { |
| ngx_socket_t fd; |
| |
| ngx_free_connection(c); |
| |
| fd = c->fd; |
| c->fd = (ngx_socket_t) -1; |
| |
| if (ngx_close_socket(fd) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno, |
| ngx_close_socket_n " failed"); |
| } |
| |
| if (c->pool) { |
| ngx_destroy_pool(c->pool); |
| } |
| |
| #if (NGX_STAT_STUB) |
| (void) ngx_atomic_fetch_add(ngx_stat_active, -1); |
| #endif |
| } |
| |
| |
| u_char * |
| ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len) |
| { |
| return ngx_snprintf(buf, len, " while accepting new connection on %V", |
| log->data); |
| } |
| |
| |
| #if (NGX_DEBUG) |
| |
| void |
| ngx_debug_accepted_connection(ngx_event_conf_t *ecf, ngx_connection_t *c) |
| { |
| struct sockaddr_in *sin; |
| ngx_cidr_t *cidr; |
| ngx_uint_t i; |
| #if (NGX_HAVE_INET6) |
| struct sockaddr_in6 *sin6; |
| ngx_uint_t n; |
| #endif |
| |
| cidr = ecf->debug_connection.elts; |
| for (i = 0; i < ecf->debug_connection.nelts; i++) { |
| if (cidr[i].family != (ngx_uint_t) c->sockaddr->sa_family) { |
| goto next; |
| } |
| |
| switch (cidr[i].family) { |
| |
| #if (NGX_HAVE_INET6) |
| case AF_INET6: |
| sin6 = (struct sockaddr_in6 *) c->sockaddr; |
| for (n = 0; n < 16; n++) { |
| if ((sin6->sin6_addr.s6_addr[n] |
| & cidr[i].u.in6.mask.s6_addr[n]) |
| != cidr[i].u.in6.addr.s6_addr[n]) |
| { |
| goto next; |
| } |
| } |
| break; |
| #endif |
| |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| case AF_UNIX: |
| break; |
| #endif |
| |
| default: /* AF_INET */ |
| sin = (struct sockaddr_in *) c->sockaddr; |
| if ((sin->sin_addr.s_addr & cidr[i].u.in.mask) |
| != cidr[i].u.in.addr) |
| { |
| goto next; |
| } |
| break; |
| } |
| |
| c->log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL; |
| break; |
| |
| next: |
| continue; |
| } |
| } |
| |
| #endif |
