Mercurial > hg > nginx-quic
diff src/event/ngx_event_udp.c @ 7285:88a624c9b491
Events: moved ngx_recvmsg() to new file src/event/ngx_event_udp.c.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Fri, 01 Jun 2018 16:55:49 +0300 |
parents | |
children | d27aa9060c95 |
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new file mode 100644 --- /dev/null +++ b/src/event/ngx_event_udp.c @@ -0,0 +1,376 @@ + +/* + * Copyright (C) Roman Arutyunyan + * Copyright (C) Nginx, Inc. + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_event.h> + + +#if !(NGX_WIN32) + +static void ngx_close_accepted_udp_connection(ngx_connection_t *c); + + +void +ngx_event_recvmsg(ngx_event_t *ev) +{ + ssize_t n; + ngx_log_t *log; + ngx_err_t err; + socklen_t socklen, local_socklen; + ngx_event_t *rev, *wev; + struct iovec iov[1]; + struct msghdr msg; + ngx_sockaddr_t sa, lsa; + struct sockaddr *sockaddr, *local_sockaddr; + ngx_listening_t *ls; + ngx_event_conf_t *ecf; + ngx_connection_t *c, *lc; + static u_char buffer[65535]; + +#if (NGX_HAVE_MSGHDR_MSG_CONTROL) + +#if (NGX_HAVE_IP_RECVDSTADDR) + u_char msg_control[CMSG_SPACE(sizeof(struct in_addr))]; +#elif (NGX_HAVE_IP_PKTINFO) + u_char msg_control[CMSG_SPACE(sizeof(struct in_pktinfo))]; +#endif + +#if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) + u_char msg_control6[CMSG_SPACE(sizeof(struct in6_pktinfo))]; +#endif + +#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, + "recvmsg on %V, ready: %d", &ls->addr_text, ev->available); + + do { + ngx_memzero(&msg, sizeof(struct msghdr)); + + iov[0].iov_base = (void *) buffer; + iov[0].iov_len = sizeof(buffer); + + msg.msg_name = &sa; + msg.msg_namelen = sizeof(ngx_sockaddr_t); + msg.msg_iov = iov; + msg.msg_iovlen = 1; + +#if (NGX_HAVE_MSGHDR_MSG_CONTROL) + + if (ls->wildcard) { + +#if (NGX_HAVE_IP_RECVDSTADDR || NGX_HAVE_IP_PKTINFO) + if (ls->sockaddr->sa_family == AF_INET) { + msg.msg_control = &msg_control; + msg.msg_controllen = sizeof(msg_control); + } +#endif + +#if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) + if (ls->sockaddr->sa_family == AF_INET6) { + msg.msg_control = &msg_control6; + msg.msg_controllen = sizeof(msg_control6); + } +#endif + } + +#endif + + n = recvmsg(lc->fd, &msg, 0); + + if (n == -1) { + err = ngx_socket_errno; + + if (err == NGX_EAGAIN) { + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err, + "recvmsg() not ready"); + return; + } + + ngx_log_error(NGX_LOG_ALERT, ev->log, err, "recvmsg() failed"); + + return; + } + +#if (NGX_HAVE_MSGHDR_MSG_CONTROL) + if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) { + ngx_log_error(NGX_LOG_ALERT, ev->log, 0, + "recvmsg() truncated data"); + continue; + } +#endif + + sockaddr = msg.msg_name; + socklen = msg.msg_namelen; + + if (socklen > (socklen_t) sizeof(ngx_sockaddr_t)) { + socklen = sizeof(ngx_sockaddr_t); + } + + if (socklen == 0) { + + /* + * on Linux recvmsg() returns zero msg_namelen + * when receiving packets from unbound AF_UNIX sockets + */ + + socklen = sizeof(struct sockaddr); + ngx_memzero(&sa, sizeof(struct sockaddr)); + sa.sockaddr.sa_family = ls->sockaddr->sa_family; + } + + local_sockaddr = ls->sockaddr; + local_socklen = ls->socklen; + +#if (NGX_HAVE_MSGHDR_MSG_CONTROL) + + if (ls->wildcard) { + struct cmsghdr *cmsg; + + ngx_memcpy(&lsa, local_sockaddr, local_socklen); + local_sockaddr = &lsa.sockaddr; + + for (cmsg = CMSG_FIRSTHDR(&msg); + cmsg != NULL; + cmsg = CMSG_NXTHDR(&msg, cmsg)) + { + +#if (NGX_HAVE_IP_RECVDSTADDR) + + if (cmsg->cmsg_level == IPPROTO_IP + && cmsg->cmsg_type == IP_RECVDSTADDR + && local_sockaddr->sa_family == AF_INET) + { + struct in_addr *addr; + struct sockaddr_in *sin; + + addr = (struct in_addr *) CMSG_DATA(cmsg); + sin = (struct sockaddr_in *) local_sockaddr; + sin->sin_addr = *addr; + + break; + } + +#elif (NGX_HAVE_IP_PKTINFO) + + if (cmsg->cmsg_level == IPPROTO_IP + && cmsg->cmsg_type == IP_PKTINFO + && local_sockaddr->sa_family == AF_INET) + { + struct in_pktinfo *pkt; + struct sockaddr_in *sin; + + pkt = (struct in_pktinfo *) CMSG_DATA(cmsg); + sin = (struct sockaddr_in *) local_sockaddr; + sin->sin_addr = pkt->ipi_addr; + + break; + } + +#endif + +#if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) + + if (cmsg->cmsg_level == IPPROTO_IPV6 + && cmsg->cmsg_type == IPV6_PKTINFO + && local_sockaddr->sa_family == AF_INET6) + { + struct in6_pktinfo *pkt6; + struct sockaddr_in6 *sin6; + + pkt6 = (struct in6_pktinfo *) CMSG_DATA(cmsg); + sin6 = (struct sockaddr_in6 *) local_sockaddr; + sin6->sin6_addr = pkt6->ipi6_addr; + + break; + } + +#endif + + } + } + +#endif + +#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(lc->fd, ev->log); + if (c == NULL) { + return; + } + + c->shared = 1; + c->type = SOCK_DGRAM; + c->socklen = socklen; + +#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_udp_connection(c); + return; + } + + c->sockaddr = ngx_palloc(c->pool, socklen); + if (c->sockaddr == NULL) { + ngx_close_accepted_udp_connection(c); + return; + } + + ngx_memcpy(c->sockaddr, sockaddr, socklen); + + log = ngx_palloc(c->pool, sizeof(ngx_log_t)); + if (log == NULL) { + ngx_close_accepted_udp_connection(c); + return; + } + + *log = ls->log; + + c->send = ngx_udp_send; + c->send_chain = ngx_udp_send_chain; + + c->log = log; + c->pool->log = log; + c->listening = ls; + + if (local_sockaddr == &lsa.sockaddr) { + local_sockaddr = ngx_palloc(c->pool, local_socklen); + if (local_sockaddr == NULL) { + ngx_close_accepted_udp_connection(c); + return; + } + + ngx_memcpy(local_sockaddr, &lsa, local_socklen); + } + + c->local_sockaddr = local_sockaddr; + c->local_socklen = local_socklen; + + c->buffer = ngx_create_temp_buf(c->pool, n); + if (c->buffer == NULL) { + ngx_close_accepted_udp_connection(c); + return; + } + + c->buffer->last = ngx_cpymem(c->buffer->last, buffer, n); + + rev = c->read; + wev = c->write; + + wev->ready = 1; + + 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); + +#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_udp_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_udp_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_debug4(NGX_LOG_DEBUG_EVENT, log, 0, + "*%uA recvmsg: %V fd:%d n:%z", + c->number, &addr, c->fd, n); + } + + } +#endif + + log->data = NULL; + log->handler = NULL; + + ls->handler(c); + + if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { + ev->available -= n; + } + + } while (ev->available); +} + + +static void +ngx_close_accepted_udp_connection(ngx_connection_t *c) +{ + ngx_free_connection(c); + + c->fd = (ngx_socket_t) -1; + + if (c->pool) { + ngx_destroy_pool(c->pool); + } + +#if (NGX_STAT_STUB) + (void) ngx_atomic_fetch_add(ngx_stat_active, -1); +#endif +} + +#endif