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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 07:24:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 07:24:22 +0000
commit45d6379135504814ab723b57f0eb8be23393a51d (patch)
treed4f2ec4acca824a8446387a758b0ce4238a4dffa /lib/isc/netmgr/udp.c
parentInitial commit. (diff)
downloadbind9-45d6379135504814ab723b57f0eb8be23393a51d.tar.xz
bind9-45d6379135504814ab723b57f0eb8be23393a51d.zip
Adding upstream version 1:9.16.44.upstream/1%9.16.44upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/isc/netmgr/udp.c')
-rw-r--r--lib/isc/netmgr/udp.c1211
1 files changed, 1211 insertions, 0 deletions
diff --git a/lib/isc/netmgr/udp.c b/lib/isc/netmgr/udp.c
new file mode 100644
index 0000000..00f9d40
--- /dev/null
+++ b/lib/isc/netmgr/udp.c
@@ -0,0 +1,1211 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <unistd.h>
+#include <uv.h>
+
+#include <isc/atomic.h>
+#include <isc/barrier.h>
+#include <isc/buffer.h>
+#include <isc/condition.h>
+#include <isc/errno.h>
+#include <isc/magic.h>
+#include <isc/mem.h>
+#include <isc/netmgr.h>
+#include <isc/random.h>
+#include <isc/refcount.h>
+#include <isc/region.h>
+#include <isc/result.h>
+#include <isc/sockaddr.h>
+#include <isc/thread.h>
+#include <isc/util.h>
+
+#include "netmgr-int.h"
+#include "uv-compat.h"
+
+static isc_result_t
+udp_send_direct(isc_nmsocket_t *sock, isc__nm_uvreq_t *req,
+ isc_sockaddr_t *peer);
+
+static void
+udp_recv_cb(uv_udp_t *handle, ssize_t nrecv, const uv_buf_t *buf,
+ const struct sockaddr *addr, unsigned flags);
+
+static void
+udp_send_cb(uv_udp_send_t *req, int status);
+
+static void
+udp_close_cb(uv_handle_t *handle);
+
+static void
+read_timer_close_cb(uv_handle_t *handle);
+
+static void
+udp_close_direct(isc_nmsocket_t *sock);
+
+static void
+stop_udp_parent(isc_nmsocket_t *sock);
+static void
+stop_udp_child(isc_nmsocket_t *sock);
+
+static uv_os_sock_t
+isc__nm_udp_lb_socket(isc_nm_t *mgr, sa_family_t sa_family) {
+ isc_result_t result;
+ uv_os_sock_t sock;
+
+ result = isc__nm_socket(sa_family, SOCK_DGRAM, 0, &sock);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+
+ (void)isc__nm_socket_incoming_cpu(sock);
+ (void)isc__nm_socket_disable_pmtud(sock, sa_family);
+
+ result = isc__nm_socket_reuse(sock);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+
+#ifndef _WIN32
+ if (mgr->load_balance_sockets) {
+ result = isc__nm_socket_reuse_lb(sock);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+ }
+#endif
+
+ return (sock);
+}
+
+static void
+start_udp_child(isc_nm_t *mgr, isc_sockaddr_t *iface, isc_nmsocket_t *sock,
+ uv_os_sock_t fd, int tid) {
+ isc_nmsocket_t *csock;
+ isc__netievent_udplisten_t *ievent = NULL;
+
+ csock = &sock->children[tid];
+
+ isc__nmsocket_init(csock, mgr, isc_nm_udpsocket, iface);
+ csock->parent = sock;
+ csock->iface = sock->iface;
+ csock->reading = true;
+ csock->recv_cb = sock->recv_cb;
+ csock->recv_cbarg = sock->recv_cbarg;
+ csock->extrahandlesize = sock->extrahandlesize;
+ csock->tid = tid;
+
+#ifdef _WIN32
+ UNUSED(fd);
+ csock->fd = isc__nm_udp_lb_socket(mgr, iface->type.sa.sa_family);
+#else
+ if (mgr->load_balance_sockets) {
+ UNUSED(fd);
+ csock->fd = isc__nm_udp_lb_socket(mgr,
+ iface->type.sa.sa_family);
+ } else {
+ csock->fd = dup(fd);
+ }
+#endif
+ REQUIRE(csock->fd >= 0);
+
+ ievent = isc__nm_get_netievent_udplisten(mgr, csock);
+ isc__nm_maybe_enqueue_ievent(&mgr->workers[tid],
+ (isc__netievent_t *)ievent);
+}
+
+static void
+enqueue_stoplistening(isc_nmsocket_t *sock) {
+ isc__netievent_udpstop_t *ievent =
+ isc__nm_get_netievent_udpstop(sock->mgr, sock);
+ isc__nm_enqueue_ievent(&sock->mgr->workers[sock->tid],
+ (isc__netievent_t *)ievent);
+}
+
+isc_result_t
+isc_nm_listenudp(isc_nm_t *mgr, isc_sockaddr_t *iface, isc_nm_recv_cb_t cb,
+ void *cbarg, size_t extrahandlesize, isc_nmsocket_t **sockp) {
+ isc_result_t result = ISC_R_SUCCESS;
+ isc_nmsocket_t *sock = NULL;
+ size_t children_size = 0;
+ REQUIRE(VALID_NM(mgr));
+ uv_os_sock_t fd = -1;
+
+ /*
+ * We are creating mgr->nworkers duplicated sockets, one
+ * socket for each worker thread.
+ */
+ sock = isc_mem_get(mgr->mctx, sizeof(isc_nmsocket_t));
+ isc__nmsocket_init(sock, mgr, isc_nm_udplistener, iface);
+
+ atomic_init(&sock->rchildren, 0);
+#if defined(WIN32)
+ sock->nchildren = 1;
+#else
+ sock->nchildren = mgr->nworkers;
+#endif
+
+ children_size = sock->nchildren * sizeof(sock->children[0]);
+ sock->children = isc_mem_get(mgr->mctx, children_size);
+ memset(sock->children, 0, children_size);
+
+ sock->recv_cb = cb;
+ sock->recv_cbarg = cbarg;
+ sock->extrahandlesize = extrahandlesize;
+ sock->result = ISC_R_UNSET;
+
+ sock->tid = 0;
+ sock->fd = -1;
+
+#ifndef _WIN32
+ if (!mgr->load_balance_sockets) {
+ fd = isc__nm_udp_lb_socket(mgr, iface->type.sa.sa_family);
+ }
+#endif
+
+ isc_barrier_init(&sock->startlistening, sock->nchildren);
+
+ for (size_t i = 0; i < sock->nchildren; i++) {
+ if ((int)i == isc_nm_tid()) {
+ continue;
+ }
+ start_udp_child(mgr, iface, sock, fd, i);
+ }
+
+ if (isc__nm_in_netthread()) {
+ start_udp_child(mgr, iface, sock, fd, isc_nm_tid());
+ }
+
+#ifndef _WIN32
+ if (!mgr->load_balance_sockets) {
+ isc__nm_closesocket(fd);
+ }
+#endif
+
+ LOCK(&sock->lock);
+ while (atomic_load(&sock->rchildren) != sock->nchildren) {
+ WAIT(&sock->cond, &sock->lock);
+ }
+ result = sock->result;
+ atomic_store(&sock->active, true);
+ UNLOCK(&sock->lock);
+
+ INSIST(result != ISC_R_UNSET);
+
+ if (result == ISC_R_SUCCESS) {
+ REQUIRE(atomic_load(&sock->rchildren) == sock->nchildren);
+ *sockp = sock;
+ } else {
+ atomic_store(&sock->active, false);
+ enqueue_stoplistening(sock);
+ isc_nmsocket_close(&sock);
+ }
+
+ return (result);
+}
+
+/*
+ * Asynchronous 'udplisten' call handler: start listening on a UDP socket.
+ */
+void
+isc__nm_async_udplisten(isc__networker_t *worker, isc__netievent_t *ev0) {
+ isc__netievent_udplisten_t *ievent = (isc__netievent_udplisten_t *)ev0;
+ isc_nmsocket_t *sock = NULL;
+ int r, uv_bind_flags = 0;
+ int uv_init_flags = 0;
+ sa_family_t sa_family;
+ isc_result_t result = ISC_R_UNSET;
+ isc_nm_t *mgr = NULL;
+
+ REQUIRE(VALID_NMSOCK(ievent->sock));
+ REQUIRE(ievent->sock->tid == isc_nm_tid());
+ REQUIRE(VALID_NMSOCK(ievent->sock->parent));
+
+ sock = ievent->sock;
+ sa_family = sock->iface.type.sa.sa_family;
+ mgr = sock->mgr;
+
+ REQUIRE(sock->type == isc_nm_udpsocket);
+ REQUIRE(sock->parent != NULL);
+ REQUIRE(sock->tid == isc_nm_tid());
+
+#if HAVE_DECL_UV_UDP_RECVMMSG
+ uv_init_flags |= UV_UDP_RECVMMSG;
+#endif
+ r = uv_udp_init_ex(&worker->loop, &sock->uv_handle.udp, uv_init_flags);
+ UV_RUNTIME_CHECK(uv_udp_init_ex, r);
+ uv_handle_set_data(&sock->uv_handle.handle, sock);
+ /* This keeps the socket alive after everything else is gone */
+ isc__nmsocket_attach(sock, &(isc_nmsocket_t *){ NULL });
+
+ r = uv_timer_init(&worker->loop, &sock->read_timer);
+ UV_RUNTIME_CHECK(uv_timer_init, r);
+ uv_handle_set_data((uv_handle_t *)&sock->read_timer, sock);
+
+ LOCK(&sock->parent->lock);
+
+ r = uv_udp_open(&sock->uv_handle.udp, sock->fd);
+ if (r < 0) {
+ isc__nm_closesocket(sock->fd);
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_OPENFAIL]);
+ goto done;
+ }
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_OPEN]);
+
+ if (sa_family == AF_INET6) {
+ uv_bind_flags |= UV_UDP_IPV6ONLY;
+ }
+
+#ifdef _WIN32
+ r = isc_uv_udp_freebind(&sock->uv_handle.udp,
+ &sock->parent->iface.type.sa, uv_bind_flags);
+ if (r < 0) {
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_BINDFAIL]);
+ goto done;
+ }
+#else
+ if (mgr->load_balance_sockets) {
+ r = isc_uv_udp_freebind(&sock->uv_handle.udp,
+ &sock->parent->iface.type.sa,
+ uv_bind_flags);
+ if (r < 0) {
+ isc__nm_incstats(sock->mgr,
+ sock->statsindex[STATID_BINDFAIL]);
+ goto done;
+ }
+ } else {
+ if (sock->parent->fd == -1) {
+ /* This thread is first, bind the socket */
+ r = isc_uv_udp_freebind(&sock->uv_handle.udp,
+ &sock->parent->iface.type.sa,
+ uv_bind_flags);
+ if (r < 0) {
+ isc__nm_incstats(sock->mgr, STATID_BINDFAIL);
+ goto done;
+ }
+ sock->parent->uv_handle.udp.flags =
+ sock->uv_handle.udp.flags;
+ sock->parent->fd = sock->fd;
+ } else {
+ /* The socket is already bound, just copy the flags */
+ sock->uv_handle.udp.flags =
+ sock->parent->uv_handle.udp.flags;
+ }
+ }
+#endif
+
+#ifdef ISC_RECV_BUFFER_SIZE
+ uv_recv_buffer_size(&sock->uv_handle.handle,
+ &(int){ ISC_RECV_BUFFER_SIZE });
+#endif
+#ifdef ISC_SEND_BUFFER_SIZE
+ uv_send_buffer_size(&sock->uv_handle.handle,
+ &(int){ ISC_SEND_BUFFER_SIZE });
+#endif
+ r = uv_udp_recv_start(&sock->uv_handle.udp, isc__nm_alloc_cb,
+ udp_recv_cb);
+ if (r != 0) {
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_BINDFAIL]);
+ goto done;
+ }
+
+ atomic_store(&sock->listening, true);
+
+done:
+ result = isc__nm_uverr2result(r);
+ atomic_fetch_add(&sock->parent->rchildren, 1);
+ if (sock->parent->result == ISC_R_UNSET) {
+ sock->parent->result = result;
+ }
+ SIGNAL(&sock->parent->cond);
+ UNLOCK(&sock->parent->lock);
+
+ isc_barrier_wait(&sock->parent->startlistening);
+}
+
+void
+isc__nm_udp_stoplistening(isc_nmsocket_t *sock) {
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->type == isc_nm_udplistener);
+
+ if (!atomic_compare_exchange_strong(&sock->closing, &(bool){ false },
+ true))
+ {
+ UNREACHABLE();
+ }
+
+ if (!isc__nm_in_netthread()) {
+ enqueue_stoplistening(sock);
+ } else {
+ stop_udp_parent(sock);
+ }
+}
+
+/*
+ * Asynchronous 'udpstop' call handler: stop listening on a UDP socket.
+ */
+void
+isc__nm_async_udpstop(isc__networker_t *worker, isc__netievent_t *ev0) {
+ isc__netievent_udpstop_t *ievent = (isc__netievent_udpstop_t *)ev0;
+ isc_nmsocket_t *sock = ievent->sock;
+
+ UNUSED(worker);
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->tid == isc_nm_tid());
+
+ if (sock->parent != NULL) {
+ stop_udp_child(sock);
+ return;
+ }
+
+ stop_udp_parent(sock);
+}
+
+/*
+ * udp_recv_cb handles incoming UDP packet from uv. The buffer here is
+ * reused for a series of packets, so we need to allocate a new one.
+ * This new one can be reused to send the response then.
+ */
+static void
+udp_recv_cb(uv_udp_t *handle, ssize_t nrecv, const uv_buf_t *buf,
+ const struct sockaddr *addr, unsigned flags) {
+ isc_nmsocket_t *sock = uv_handle_get_data((uv_handle_t *)handle);
+ isc__nm_uvreq_t *req = NULL;
+ uint32_t maxudp;
+ isc_sockaddr_t sockaddr;
+ isc_result_t result;
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->tid == isc_nm_tid());
+ REQUIRE(sock->reading);
+
+ /*
+ * When using recvmmsg(2), if no errors occur, there will be a final
+ * callback with nrecv set to 0, addr set to NULL and the buffer
+ * pointing at the initially allocated data with the UV_UDP_MMSG_CHUNK
+ * flag cleared and the UV_UDP_MMSG_FREE flag set.
+ */
+#if HAVE_DECL_UV_UDP_MMSG_FREE
+ if ((flags & UV_UDP_MMSG_FREE) == UV_UDP_MMSG_FREE) {
+ INSIST(nrecv == 0);
+ INSIST(addr == NULL);
+ goto free;
+ }
+#else
+ UNUSED(flags);
+#endif
+
+ /*
+ * - If we're simulating a firewall blocking UDP packets
+ * bigger than 'maxudp' bytes for testing purposes.
+ */
+ maxudp = atomic_load(&sock->mgr->maxudp);
+ if ((maxudp != 0 && (uint32_t)nrecv > maxudp)) {
+ /*
+ * We need to keep the read_cb intact in case, so the
+ * readtimeout_cb can trigger and not crash because of
+ * missing read_req.
+ */
+ goto free;
+ }
+
+ /*
+ * - If addr == NULL, in which case it's the end of stream;
+ * we can free the buffer and bail.
+ */
+ if (addr == NULL) {
+ isc__nm_failed_read_cb(sock, ISC_R_EOF, false);
+ goto free;
+ }
+
+ /*
+ * - If the socket is no longer active.
+ */
+ if (!isc__nmsocket_active(sock)) {
+ isc__nm_failed_read_cb(sock, ISC_R_CANCELED, false);
+ goto free;
+ }
+
+ if (nrecv < 0) {
+ isc__nm_failed_read_cb(sock, isc__nm_uverr2result(nrecv),
+ false);
+ goto free;
+ }
+
+ result = isc_sockaddr_fromsockaddr(&sockaddr, addr);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+
+ req = isc__nm_get_read_req(sock, &sockaddr);
+
+ /*
+ * The callback will be called synchronously, because result is
+ * ISC_R_SUCCESS, so we are ok of passing the buf directly.
+ */
+ req->uvbuf.base = buf->base;
+ req->uvbuf.len = nrecv;
+
+ sock->recv_read = false;
+
+ REQUIRE(!sock->processing);
+ sock->processing = true;
+ isc__nm_readcb(sock, req, ISC_R_SUCCESS);
+ sock->processing = false;
+
+free:
+#if HAVE_DECL_UV_UDP_MMSG_CHUNK
+ /*
+ * When using recvmmsg(2), chunks will have the UV_UDP_MMSG_CHUNK flag
+ * set, those must not be freed.
+ */
+ if ((flags & UV_UDP_MMSG_CHUNK) == UV_UDP_MMSG_CHUNK) {
+ return;
+ }
+#endif
+
+ /*
+ * When using recvmmsg(2), if a UDP socket error occurs, nrecv will be <
+ * 0. In either scenario, the callee can now safely free the provided
+ * buffer.
+ */
+ if (nrecv < 0) {
+ /*
+ * The buffer may be a null buffer on error.
+ */
+ if (buf->base == NULL && buf->len == 0) {
+ return;
+ }
+ }
+
+ isc__nm_free_uvbuf(sock, buf);
+}
+
+/*
+ * Send the data in 'region' to a peer via a UDP socket. We try to find
+ * a proper sibling/child socket so that we won't have to jump to
+ * another thread.
+ */
+void
+isc__nm_udp_send(isc_nmhandle_t *handle, const isc_region_t *region,
+ isc_nm_cb_t cb, void *cbarg) {
+ isc_nmsocket_t *sock = handle->sock;
+ isc_nmsocket_t *rsock = NULL;
+ isc_sockaddr_t *peer = &handle->peer;
+ isc__nm_uvreq_t *uvreq = NULL;
+ uint32_t maxudp = atomic_load(&sock->mgr->maxudp);
+ int ntid;
+
+ INSIST(sock->type == isc_nm_udpsocket);
+
+ /*
+ * We're simulating a firewall blocking UDP packets bigger than
+ * 'maxudp' bytes, for testing purposes.
+ *
+ * The client would ordinarily have unreferenced the handle
+ * in the callback, but that won't happen in this case, so
+ * we need to do so here.
+ */
+ if (maxudp != 0 && region->length > maxudp) {
+ isc_nmhandle_detach(&handle);
+ return;
+ }
+
+ if (atomic_load(&sock->client)) {
+ /*
+ * When we are sending from the client socket, we directly use
+ * the socket provided.
+ */
+ rsock = sock;
+ goto send;
+ } else {
+ /*
+ * When we are sending from the server socket, we either use the
+ * socket associated with the network thread we are in, or we
+ * use the thread from the socket associated with the handle.
+ */
+ INSIST(sock->parent != NULL);
+
+#if defined(WIN32)
+ /* On Windows, we have only a single listening listener */
+ rsock = sock;
+#else
+ if (isc__nm_in_netthread()) {
+ ntid = isc_nm_tid();
+ } else {
+ ntid = sock->tid;
+ }
+ rsock = &sock->parent->children[ntid];
+#endif
+ }
+
+send:
+ uvreq = isc__nm_uvreq_get(rsock->mgr, rsock);
+ uvreq->uvbuf.base = (char *)region->base;
+ uvreq->uvbuf.len = region->length;
+
+ isc_nmhandle_attach(handle, &uvreq->handle);
+
+ uvreq->cb.send = cb;
+ uvreq->cbarg = cbarg;
+
+ if (isc_nm_tid() == rsock->tid) {
+ REQUIRE(rsock->tid == isc_nm_tid());
+ isc__netievent_udpsend_t ievent = { .sock = rsock,
+ .req = uvreq,
+ .peer = *peer };
+
+ isc__nm_async_udpsend(NULL, (isc__netievent_t *)&ievent);
+ } else {
+ isc__netievent_udpsend_t *ievent =
+ isc__nm_get_netievent_udpsend(sock->mgr, rsock);
+ ievent->peer = *peer;
+ ievent->req = uvreq;
+
+ isc__nm_enqueue_ievent(&sock->mgr->workers[rsock->tid],
+ (isc__netievent_t *)ievent);
+ }
+}
+
+/*
+ * Asynchronous 'udpsend' event handler: send a packet on a UDP socket.
+ */
+void
+isc__nm_async_udpsend(isc__networker_t *worker, isc__netievent_t *ev0) {
+ isc_result_t result;
+ isc__netievent_udpsend_t *ievent = (isc__netievent_udpsend_t *)ev0;
+ isc_nmsocket_t *sock = ievent->sock;
+ isc__nm_uvreq_t *uvreq = ievent->req;
+
+ REQUIRE(sock->type == isc_nm_udpsocket);
+ REQUIRE(sock->tid == isc_nm_tid());
+ UNUSED(worker);
+
+ if (isc__nmsocket_closing(sock)) {
+ isc__nm_failed_send_cb(sock, uvreq, ISC_R_CANCELED);
+ return;
+ }
+
+ result = udp_send_direct(sock, uvreq, &ievent->peer);
+ if (result != ISC_R_SUCCESS) {
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_SENDFAIL]);
+ isc__nm_failed_send_cb(sock, uvreq, result);
+ }
+}
+
+static void
+udp_send_cb(uv_udp_send_t *req, int status) {
+ isc_result_t result = ISC_R_SUCCESS;
+ isc__nm_uvreq_t *uvreq = uv_handle_get_data((uv_handle_t *)req);
+ isc_nmsocket_t *sock = NULL;
+
+ REQUIRE(VALID_UVREQ(uvreq));
+ REQUIRE(VALID_NMHANDLE(uvreq->handle));
+
+ sock = uvreq->sock;
+
+ REQUIRE(sock->tid == isc_nm_tid());
+
+ if (status < 0) {
+ result = isc__nm_uverr2result(status);
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_SENDFAIL]);
+ }
+
+ isc__nm_sendcb(sock, uvreq, result, false);
+}
+
+/*
+ * udp_send_direct sends buf to a peer on a socket. Sock has to be in
+ * the same thread as the callee.
+ */
+static isc_result_t
+udp_send_direct(isc_nmsocket_t *sock, isc__nm_uvreq_t *req,
+ isc_sockaddr_t *peer) {
+ const struct sockaddr *sa = &peer->type.sa;
+ int r;
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(VALID_UVREQ(req));
+ REQUIRE(sock->tid == isc_nm_tid());
+ REQUIRE(sock->type == isc_nm_udpsocket);
+
+ if (isc__nmsocket_closing(sock)) {
+ return (ISC_R_CANCELED);
+ }
+
+#if UV_VERSION_HEX >= UV_VERSION(1, 27, 0)
+ /*
+ * If we used uv_udp_connect() (and not the shim version for
+ * older versions of libuv), then the peer address has to be
+ * set to NULL or else uv_udp_send() could fail or assert,
+ * depending on the libuv version.
+ */
+ if (atomic_load(&sock->connected)) {
+ sa = NULL;
+ }
+#endif
+
+ r = uv_udp_send(&req->uv_req.udp_send, &sock->uv_handle.udp,
+ &req->uvbuf, 1, sa, udp_send_cb);
+ if (r < 0) {
+ return (isc__nm_uverr2result(r));
+ }
+
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+udp_connect_direct(isc_nmsocket_t *sock, isc__nm_uvreq_t *req) {
+ isc__networker_t *worker = NULL;
+ int uv_bind_flags = UV_UDP_REUSEADDR;
+ isc_result_t result = ISC_R_UNSET;
+ int tries = 3;
+ int r;
+
+ REQUIRE(isc__nm_in_netthread());
+ REQUIRE(sock->tid == isc_nm_tid());
+
+ worker = &sock->mgr->workers[isc_nm_tid()];
+
+ atomic_store(&sock->connecting, true);
+
+ r = uv_udp_init(&worker->loop, &sock->uv_handle.udp);
+ UV_RUNTIME_CHECK(uv_udp_init, r);
+ uv_handle_set_data(&sock->uv_handle.handle, sock);
+
+ r = uv_timer_init(&worker->loop, &sock->read_timer);
+ UV_RUNTIME_CHECK(uv_timer_init, r);
+ uv_handle_set_data((uv_handle_t *)&sock->read_timer, sock);
+
+ r = uv_udp_open(&sock->uv_handle.udp, sock->fd);
+ if (r != 0) {
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_OPENFAIL]);
+ goto done;
+ }
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_OPEN]);
+
+ if (sock->iface.type.sa.sa_family == AF_INET6) {
+ uv_bind_flags |= UV_UDP_IPV6ONLY;
+ }
+
+ r = uv_udp_bind(&sock->uv_handle.udp, &sock->iface.type.sa,
+ uv_bind_flags);
+ if (r != 0) {
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_BINDFAIL]);
+ goto done;
+ }
+
+#ifdef ISC_RECV_BUFFER_SIZE
+ uv_recv_buffer_size(&sock->uv_handle.handle,
+ &(int){ ISC_RECV_BUFFER_SIZE });
+#endif
+#ifdef ISC_SEND_BUFFER_SIZE
+ uv_send_buffer_size(&sock->uv_handle.handle,
+ &(int){ ISC_SEND_BUFFER_SIZE });
+#endif
+
+ /*
+ * On FreeBSD the UDP connect() call sometimes results in a
+ * spurious transient EADDRINUSE. Try a few more times before
+ * giving up.
+ */
+ do {
+ r = isc_uv_udp_connect(&sock->uv_handle.udp,
+ &req->peer.type.sa);
+ } while (r == UV_EADDRINUSE && --tries > 0);
+ if (r != 0) {
+ isc__nm_incstats(sock->mgr,
+ sock->statsindex[STATID_CONNECTFAIL]);
+ goto done;
+ }
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_CONNECT]);
+
+ atomic_store(&sock->connecting, false);
+ atomic_store(&sock->connected, true);
+
+done:
+ result = isc__nm_uverr2result(r);
+
+ LOCK(&sock->lock);
+ sock->result = result;
+ SIGNAL(&sock->cond);
+ if (!atomic_load(&sock->active)) {
+ WAIT(&sock->scond, &sock->lock);
+ }
+ INSIST(atomic_load(&sock->active));
+ UNLOCK(&sock->lock);
+
+ return (result);
+}
+
+/*
+ * Asynchronous 'udpconnect' call handler: open a new UDP socket and
+ * call the 'open' callback with a handle.
+ */
+void
+isc__nm_async_udpconnect(isc__networker_t *worker, isc__netievent_t *ev0) {
+ isc__netievent_udpconnect_t *ievent =
+ (isc__netievent_udpconnect_t *)ev0;
+ isc_nmsocket_t *sock = ievent->sock;
+ isc__nm_uvreq_t *req = ievent->req;
+ isc_result_t result;
+
+ UNUSED(worker);
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->type == isc_nm_udpsocket);
+ REQUIRE(sock->parent == NULL);
+ REQUIRE(sock->tid == isc_nm_tid());
+
+ result = udp_connect_direct(sock, req);
+ if (result != ISC_R_SUCCESS) {
+ atomic_store(&sock->active, false);
+ isc__nm_udp_close(sock);
+ isc__nm_connectcb(sock, req, result, true);
+ } else {
+ /*
+ * The callback has to be called after the socket has been
+ * initialized
+ */
+ isc__nm_connectcb(sock, req, ISC_R_SUCCESS, true);
+ }
+
+ /*
+ * The sock is now attached to the handle.
+ */
+ isc__nmsocket_detach(&sock);
+}
+
+void
+isc_nm_udpconnect(isc_nm_t *mgr, isc_sockaddr_t *local, isc_sockaddr_t *peer,
+ isc_nm_cb_t cb, void *cbarg, unsigned int timeout,
+ size_t extrahandlesize) {
+ isc_result_t result = ISC_R_SUCCESS;
+ isc_nmsocket_t *sock = NULL;
+ isc__netievent_udpconnect_t *event = NULL;
+ isc__nm_uvreq_t *req = NULL;
+ sa_family_t sa_family;
+
+ REQUIRE(VALID_NM(mgr));
+ REQUIRE(local != NULL);
+ REQUIRE(peer != NULL);
+
+ sa_family = peer->type.sa.sa_family;
+
+ sock = isc_mem_get(mgr->mctx, sizeof(isc_nmsocket_t));
+ isc__nmsocket_init(sock, mgr, isc_nm_udpsocket, local);
+
+ sock->connect_cb = cb;
+ sock->connect_cbarg = cbarg;
+ sock->read_timeout = timeout;
+ sock->extrahandlesize = extrahandlesize;
+ sock->peer = *peer;
+ sock->result = ISC_R_UNSET;
+ atomic_init(&sock->client, true);
+
+ req = isc__nm_uvreq_get(mgr, sock);
+ req->cb.connect = cb;
+ req->cbarg = cbarg;
+ req->peer = *peer;
+ req->local = *local;
+ req->handle = isc__nmhandle_get(sock, &req->peer, &sock->iface);
+
+ result = isc__nm_socket(sa_family, SOCK_DGRAM, 0, &sock->fd);
+ if (result != ISC_R_SUCCESS) {
+ if (isc__nm_in_netthread()) {
+ sock->tid = isc_nm_tid();
+ }
+ isc__nmsocket_clearcb(sock);
+ isc__nm_connectcb(sock, req, result, true);
+ atomic_store(&sock->closed, true);
+ isc__nmsocket_detach(&sock);
+ return;
+ }
+
+ result = isc__nm_socket_reuse(sock->fd);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS ||
+ result == ISC_R_NOTIMPLEMENTED);
+
+ result = isc__nm_socket_reuse_lb(sock->fd);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS ||
+ result == ISC_R_NOTIMPLEMENTED);
+
+ (void)isc__nm_socket_incoming_cpu(sock->fd);
+
+ (void)isc__nm_socket_disable_pmtud(sock->fd, sa_family);
+
+ event = isc__nm_get_netievent_udpconnect(mgr, sock, req);
+
+ if (isc__nm_in_netthread()) {
+ atomic_store(&sock->active, true);
+ sock->tid = isc_nm_tid();
+ isc__nm_async_udpconnect(&mgr->workers[sock->tid],
+ (isc__netievent_t *)event);
+ isc__nm_put_netievent_udpconnect(mgr, event);
+ } else {
+ atomic_init(&sock->active, false);
+ sock->tid = isc_random_uniform(mgr->nworkers);
+ isc__nm_enqueue_ievent(&mgr->workers[sock->tid],
+ (isc__netievent_t *)event);
+ }
+ LOCK(&sock->lock);
+ while (sock->result == ISC_R_UNSET) {
+ WAIT(&sock->cond, &sock->lock);
+ }
+ atomic_store(&sock->active, true);
+ BROADCAST(&sock->scond);
+ UNLOCK(&sock->lock);
+}
+
+void
+isc__nm_udp_read_cb(uv_udp_t *handle, ssize_t nrecv, const uv_buf_t *buf,
+ const struct sockaddr *addr, unsigned flags) {
+ isc_nmsocket_t *sock = uv_handle_get_data((uv_handle_t *)handle);
+ REQUIRE(VALID_NMSOCK(sock));
+
+ udp_recv_cb(handle, nrecv, buf, addr, flags);
+ /*
+ * If a caller calls isc_nm_read() on a listening socket, we can
+ * get here, but we MUST NOT stop reading from the listener
+ * socket. The only difference between listener and connected
+ * sockets is that the former has sock->parent set and later
+ * does not.
+ */
+ if (!sock->parent) {
+ isc__nm_stop_reading(sock);
+ }
+}
+
+void
+isc__nm_udp_failed_read_cb(isc_nmsocket_t *sock, isc_result_t result) {
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(result != ISC_R_SUCCESS);
+
+ if (atomic_load(&sock->client)) {
+ isc__nmsocket_timer_stop(sock);
+ isc__nm_stop_reading(sock);
+
+ if (!sock->recv_read) {
+ goto destroy;
+ }
+ sock->recv_read = false;
+
+ if (sock->recv_cb != NULL) {
+ isc__nm_uvreq_t *req = isc__nm_get_read_req(sock, NULL);
+ isc__nmsocket_clearcb(sock);
+ isc__nm_readcb(sock, req, result);
+ }
+
+ destroy:
+ isc__nmsocket_prep_destroy(sock);
+ return;
+ }
+
+ /*
+ * For UDP server socket, we don't have child socket via
+ * "accept", so we:
+ * - we continue to read
+ * - we don't clear the callbacks
+ * - we don't destroy it (only stoplistening could do that)
+ */
+ if (!sock->recv_read) {
+ return;
+ }
+ sock->recv_read = false;
+
+ if (sock->recv_cb != NULL) {
+ isc__nm_uvreq_t *req = isc__nm_get_read_req(sock, NULL);
+ isc__nm_readcb(sock, req, result);
+ }
+}
+
+/*
+ * Asynchronous 'udpread' call handler: start or resume reading on a
+ * socket; pause reading and call the 'recv' callback after each
+ * datagram.
+ */
+void
+isc__nm_async_udpread(isc__networker_t *worker, isc__netievent_t *ev0) {
+ isc__netievent_udpread_t *ievent = (isc__netievent_udpread_t *)ev0;
+ isc_nmsocket_t *sock = ievent->sock;
+ isc_result_t result;
+
+ UNUSED(worker);
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->tid == isc_nm_tid());
+
+ if (isc__nmsocket_closing(sock)) {
+ result = ISC_R_CANCELED;
+ } else {
+ result = isc__nm_start_reading(sock);
+ }
+
+ if (result != ISC_R_SUCCESS) {
+ sock->reading = true;
+ isc__nm_failed_read_cb(sock, result, false);
+ return;
+ }
+
+ isc__nmsocket_timer_start(sock);
+}
+
+void
+isc__nm_udp_read(isc_nmhandle_t *handle, isc_nm_recv_cb_t cb, void *cbarg) {
+ REQUIRE(VALID_NMHANDLE(handle));
+ REQUIRE(VALID_NMSOCK(handle->sock));
+
+ isc_nmsocket_t *sock = handle->sock;
+
+ REQUIRE(sock->type == isc_nm_udpsocket);
+ REQUIRE(sock->statichandle == handle);
+ REQUIRE(sock->tid == isc_nm_tid());
+ REQUIRE(!sock->recv_read);
+
+ sock->recv_cb = cb;
+ sock->recv_cbarg = cbarg;
+ sock->recv_read = true;
+
+ if (!sock->reading && sock->tid == isc_nm_tid()) {
+ isc__netievent_udpread_t ievent = { .sock = sock };
+ isc__nm_async_udpread(NULL, (isc__netievent_t *)&ievent);
+ } else {
+ isc__netievent_udpread_t *ievent =
+ isc__nm_get_netievent_udpread(sock->mgr, sock);
+ isc__nm_enqueue_ievent(&sock->mgr->workers[sock->tid],
+ (isc__netievent_t *)ievent);
+ }
+}
+
+static void
+udp_stop_cb(uv_handle_t *handle) {
+ isc_nmsocket_t *sock = uv_handle_get_data(handle);
+ uv_handle_set_data(handle, NULL);
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->tid == isc_nm_tid());
+ REQUIRE(atomic_load(&sock->closing));
+
+ if (!atomic_compare_exchange_strong(&sock->closed, &(bool){ false },
+ true))
+ {
+ UNREACHABLE();
+ }
+
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_CLOSE]);
+
+ atomic_store(&sock->listening, false);
+
+ isc__nmsocket_detach(&sock);
+}
+
+static void
+udp_close_cb(uv_handle_t *handle) {
+ isc_nmsocket_t *sock = uv_handle_get_data(handle);
+ uv_handle_set_data(handle, NULL);
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->tid == isc_nm_tid());
+ REQUIRE(atomic_load(&sock->closing));
+
+ if (!atomic_compare_exchange_strong(&sock->closed, &(bool){ false },
+ true))
+ {
+ UNREACHABLE();
+ }
+
+ isc__nm_incstats(sock->mgr, sock->statsindex[STATID_CLOSE]);
+
+ if (sock->server != NULL) {
+ isc__nmsocket_detach(&sock->server);
+ }
+
+ atomic_store(&sock->connected, false);
+ atomic_store(&sock->listening, false);
+
+ isc__nmsocket_prep_destroy(sock);
+}
+
+static void
+read_timer_close_cb(uv_handle_t *handle) {
+ isc_nmsocket_t *sock = uv_handle_get_data(handle);
+ uv_handle_set_data(handle, NULL);
+
+ if (sock->parent) {
+ uv_close(&sock->uv_handle.handle, udp_stop_cb);
+ } else {
+ uv_close(&sock->uv_handle.handle, udp_close_cb);
+ }
+}
+
+static void
+stop_udp_child(isc_nmsocket_t *sock) {
+ REQUIRE(sock->type == isc_nm_udpsocket);
+ REQUIRE(sock->tid == isc_nm_tid());
+
+ if (!atomic_compare_exchange_strong(&sock->closing, &(bool){ false },
+ true))
+ {
+ return;
+ }
+
+ udp_close_direct(sock);
+
+ atomic_fetch_sub(&sock->parent->rchildren, 1);
+
+ isc_barrier_wait(&sock->parent->stoplistening);
+}
+
+static void
+stop_udp_parent(isc_nmsocket_t *sock) {
+ isc_nmsocket_t *csock = NULL;
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->tid == isc_nm_tid());
+ REQUIRE(sock->type == isc_nm_udplistener);
+
+ isc_barrier_init(&sock->stoplistening, sock->nchildren);
+
+ for (size_t i = 0; i < sock->nchildren; i++) {
+ csock = &sock->children[i];
+ REQUIRE(VALID_NMSOCK(csock));
+
+ if ((int)i == isc_nm_tid()) {
+ /*
+ * We need to schedule closing the other sockets first
+ */
+ continue;
+ }
+
+ atomic_store(&csock->active, false);
+ enqueue_stoplistening(csock);
+ }
+
+ csock = &sock->children[isc_nm_tid()];
+ atomic_store(&csock->active, false);
+ stop_udp_child(csock);
+
+ atomic_store(&sock->closed, true);
+ isc__nmsocket_prep_destroy(sock);
+}
+
+static void
+udp_close_direct(isc_nmsocket_t *sock) {
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->tid == isc_nm_tid());
+
+ uv_handle_set_data((uv_handle_t *)&sock->read_timer, sock);
+ uv_close((uv_handle_t *)&sock->read_timer, read_timer_close_cb);
+}
+
+void
+isc__nm_async_udpclose(isc__networker_t *worker, isc__netievent_t *ev0) {
+ isc__netievent_udpclose_t *ievent = (isc__netievent_udpclose_t *)ev0;
+ isc_nmsocket_t *sock = ievent->sock;
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->tid == isc_nm_tid());
+ UNUSED(worker);
+
+ udp_close_direct(sock);
+}
+
+void
+isc__nm_udp_close(isc_nmsocket_t *sock) {
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->type == isc_nm_udpsocket);
+ REQUIRE(!isc__nmsocket_active(sock));
+
+ if (!atomic_compare_exchange_strong(&sock->closing, &(bool){ false },
+ true))
+ {
+ return;
+ }
+
+ if (sock->tid == isc_nm_tid()) {
+ udp_close_direct(sock);
+ } else {
+ isc__netievent_udpclose_t *ievent =
+ isc__nm_get_netievent_udpclose(sock->mgr, sock);
+ isc__nm_enqueue_ievent(&sock->mgr->workers[sock->tid],
+ (isc__netievent_t *)ievent);
+ }
+}
+
+void
+isc__nm_udp_shutdown(isc_nmsocket_t *sock) {
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->tid == isc_nm_tid());
+ REQUIRE(sock->type == isc_nm_udpsocket);
+
+ /*
+ * If the socket is active, mark it inactive and
+ * continue. If it isn't active, stop now.
+ */
+ if (!isc__nmsocket_deactivate(sock)) {
+ return;
+ }
+
+ /*
+ * If the socket is connecting, the cancel will happen in the
+ * async_udpconnect() due socket being inactive now.
+ */
+ if (atomic_load(&sock->connecting)) {
+ return;
+ }
+
+ /*
+ * When the client detaches the last handle, the
+ * sock->statichandle would be NULL, in that case, nobody is
+ * interested in the callback.
+ */
+ if (sock->statichandle != NULL) {
+ isc__nm_failed_read_cb(sock, ISC_R_CANCELED, false);
+ return;
+ }
+
+ /*
+ * Otherwise, we just send the socket to abyss...
+ */
+ if (sock->parent == NULL) {
+ isc__nmsocket_prep_destroy(sock);
+ }
+}
+
+void
+isc__nm_udp_cancelread(isc_nmhandle_t *handle) {
+ isc_nmsocket_t *sock = NULL;
+ isc__netievent_udpcancel_t *ievent = NULL;
+
+ REQUIRE(VALID_NMHANDLE(handle));
+
+ sock = handle->sock;
+
+ REQUIRE(VALID_NMSOCK(sock));
+ REQUIRE(sock->type == isc_nm_udpsocket);
+
+ ievent = isc__nm_get_netievent_udpcancel(sock->mgr, sock, handle);
+
+ isc__nm_enqueue_ievent(&sock->mgr->workers[sock->tid],
+ (isc__netievent_t *)ievent);
+}
+
+void
+isc__nm_async_udpcancel(isc__networker_t *worker, isc__netievent_t *ev0) {
+ isc__netievent_udpcancel_t *ievent = (isc__netievent_udpcancel_t *)ev0;
+ isc_nmsocket_t *sock = NULL;
+
+ UNUSED(worker);
+
+ REQUIRE(VALID_NMSOCK(ievent->sock));
+
+ sock = ievent->sock;
+
+ REQUIRE(sock->tid == isc_nm_tid());
+ REQUIRE(atomic_load(&sock->client));
+
+ isc__nm_failed_read_cb(sock, ISC_R_EOF, false);
+}