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https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Leonardo Bras](/assets/img/avatar_default.png)
For using MSG_ZEROCOPY, there are two steps:
1 - io_writev() the packet, which enqueues the packet for sending, and
2 - io_flush(), which gets confirmation that all packets got correctly sent
Currently, if MSG_ZEROCOPY is used to send packets over IPV6, no error will
be reported in (1), but it will fail in the first time (2) happens.
This happens because (2) currently checks for cmsg_level & cmsg_type
associated with IPV4 only, before reporting any error.
Add checks for cmsg_level & cmsg_type associated with IPV6, and thus enable
support for MSG_ZEROCOPY + IPV6
Fixes: 2bc58ffc29
("QIOChannelSocket: Implement io_writev zero copy flag & io_flush for CONFIG_LINUX")
Signed-off-by: Leonardo Bras <leobras@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
932 lines
26 KiB
C
932 lines
26 KiB
C
/*
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* QEMU I/O channels sockets driver
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*
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* Copyright (c) 2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qapi/qapi-visit-sockets.h"
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#include "qemu/module.h"
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#include "io/channel-socket.h"
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#include "io/channel-watch.h"
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#include "trace.h"
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#include "qapi/clone-visitor.h"
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#ifdef CONFIG_LINUX
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#include <linux/errqueue.h>
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#include <sys/socket.h>
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#if (defined(MSG_ZEROCOPY) && defined(SO_ZEROCOPY))
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#define QEMU_MSG_ZEROCOPY
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#endif
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#endif
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#define SOCKET_MAX_FDS 16
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SocketAddress *
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qio_channel_socket_get_local_address(QIOChannelSocket *ioc,
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Error **errp)
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{
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return socket_sockaddr_to_address(&ioc->localAddr,
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ioc->localAddrLen,
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errp);
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}
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SocketAddress *
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qio_channel_socket_get_remote_address(QIOChannelSocket *ioc,
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Error **errp)
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{
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return socket_sockaddr_to_address(&ioc->remoteAddr,
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ioc->remoteAddrLen,
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errp);
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}
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QIOChannelSocket *
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qio_channel_socket_new(void)
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{
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QIOChannelSocket *sioc;
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QIOChannel *ioc;
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sioc = QIO_CHANNEL_SOCKET(object_new(TYPE_QIO_CHANNEL_SOCKET));
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sioc->fd = -1;
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sioc->zero_copy_queued = 0;
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sioc->zero_copy_sent = 0;
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ioc = QIO_CHANNEL(sioc);
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qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
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#ifdef WIN32
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ioc->event = CreateEvent(NULL, FALSE, FALSE, NULL);
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#endif
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trace_qio_channel_socket_new(sioc);
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return sioc;
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}
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static int
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qio_channel_socket_set_fd(QIOChannelSocket *sioc,
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int fd,
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Error **errp)
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{
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if (sioc->fd != -1) {
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error_setg(errp, "Socket is already open");
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return -1;
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}
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sioc->fd = fd;
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sioc->remoteAddrLen = sizeof(sioc->remoteAddr);
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sioc->localAddrLen = sizeof(sioc->localAddr);
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if (getpeername(fd, (struct sockaddr *)&sioc->remoteAddr,
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&sioc->remoteAddrLen) < 0) {
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if (errno == ENOTCONN) {
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memset(&sioc->remoteAddr, 0, sizeof(sioc->remoteAddr));
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sioc->remoteAddrLen = sizeof(sioc->remoteAddr);
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} else {
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error_setg_errno(errp, errno,
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"Unable to query remote socket address");
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goto error;
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}
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}
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if (getsockname(fd, (struct sockaddr *)&sioc->localAddr,
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&sioc->localAddrLen) < 0) {
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error_setg_errno(errp, errno,
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"Unable to query local socket address");
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goto error;
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}
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#ifndef WIN32
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if (sioc->localAddr.ss_family == AF_UNIX) {
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QIOChannel *ioc = QIO_CHANNEL(sioc);
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qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_FD_PASS);
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}
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#endif /* WIN32 */
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return 0;
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error:
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sioc->fd = -1; /* Let the caller close FD on failure */
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return -1;
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}
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QIOChannelSocket *
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qio_channel_socket_new_fd(int fd,
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Error **errp)
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{
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QIOChannelSocket *ioc;
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ioc = qio_channel_socket_new();
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if (qio_channel_socket_set_fd(ioc, fd, errp) < 0) {
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object_unref(OBJECT(ioc));
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return NULL;
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}
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trace_qio_channel_socket_new_fd(ioc, fd);
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return ioc;
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}
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int qio_channel_socket_connect_sync(QIOChannelSocket *ioc,
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SocketAddress *addr,
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Error **errp)
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{
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int fd;
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trace_qio_channel_socket_connect_sync(ioc, addr);
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fd = socket_connect(addr, errp);
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if (fd < 0) {
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trace_qio_channel_socket_connect_fail(ioc);
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return -1;
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}
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trace_qio_channel_socket_connect_complete(ioc, fd);
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if (qio_channel_socket_set_fd(ioc, fd, errp) < 0) {
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close(fd);
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return -1;
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}
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#ifdef QEMU_MSG_ZEROCOPY
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int ret, v = 1;
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ret = setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &v, sizeof(v));
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if (ret == 0) {
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/* Zero copy available on host */
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qio_channel_set_feature(QIO_CHANNEL(ioc),
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QIO_CHANNEL_FEATURE_WRITE_ZERO_COPY);
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}
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#endif
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return 0;
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}
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static void qio_channel_socket_connect_worker(QIOTask *task,
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gpointer opaque)
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{
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QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
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SocketAddress *addr = opaque;
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Error *err = NULL;
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qio_channel_socket_connect_sync(ioc, addr, &err);
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qio_task_set_error(task, err);
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}
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void qio_channel_socket_connect_async(QIOChannelSocket *ioc,
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SocketAddress *addr,
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QIOTaskFunc callback,
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gpointer opaque,
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GDestroyNotify destroy,
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GMainContext *context)
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{
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QIOTask *task = qio_task_new(
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OBJECT(ioc), callback, opaque, destroy);
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SocketAddress *addrCopy;
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addrCopy = QAPI_CLONE(SocketAddress, addr);
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/* socket_connect() does a non-blocking connect(), but it
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* still blocks in DNS lookups, so we must use a thread */
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trace_qio_channel_socket_connect_async(ioc, addr);
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qio_task_run_in_thread(task,
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qio_channel_socket_connect_worker,
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addrCopy,
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(GDestroyNotify)qapi_free_SocketAddress,
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context);
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}
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int qio_channel_socket_listen_sync(QIOChannelSocket *ioc,
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SocketAddress *addr,
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int num,
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Error **errp)
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{
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int fd;
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trace_qio_channel_socket_listen_sync(ioc, addr, num);
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fd = socket_listen(addr, num, errp);
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if (fd < 0) {
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trace_qio_channel_socket_listen_fail(ioc);
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return -1;
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}
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trace_qio_channel_socket_listen_complete(ioc, fd);
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if (qio_channel_socket_set_fd(ioc, fd, errp) < 0) {
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close(fd);
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return -1;
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}
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qio_channel_set_feature(QIO_CHANNEL(ioc), QIO_CHANNEL_FEATURE_LISTEN);
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return 0;
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}
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struct QIOChannelListenWorkerData {
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SocketAddress *addr;
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int num; /* amount of expected connections */
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};
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static void qio_channel_listen_worker_free(gpointer opaque)
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{
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struct QIOChannelListenWorkerData *data = opaque;
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qapi_free_SocketAddress(data->addr);
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g_free(data);
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}
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static void qio_channel_socket_listen_worker(QIOTask *task,
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gpointer opaque)
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{
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QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
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struct QIOChannelListenWorkerData *data = opaque;
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Error *err = NULL;
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qio_channel_socket_listen_sync(ioc, data->addr, data->num, &err);
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qio_task_set_error(task, err);
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}
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void qio_channel_socket_listen_async(QIOChannelSocket *ioc,
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SocketAddress *addr,
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int num,
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QIOTaskFunc callback,
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gpointer opaque,
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GDestroyNotify destroy,
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GMainContext *context)
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{
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QIOTask *task = qio_task_new(
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OBJECT(ioc), callback, opaque, destroy);
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struct QIOChannelListenWorkerData *data;
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data = g_new0(struct QIOChannelListenWorkerData, 1);
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data->addr = QAPI_CLONE(SocketAddress, addr);
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data->num = num;
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/* socket_listen() blocks in DNS lookups, so we must use a thread */
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trace_qio_channel_socket_listen_async(ioc, addr, num);
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qio_task_run_in_thread(task,
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qio_channel_socket_listen_worker,
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data,
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qio_channel_listen_worker_free,
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context);
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}
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int qio_channel_socket_dgram_sync(QIOChannelSocket *ioc,
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SocketAddress *localAddr,
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SocketAddress *remoteAddr,
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Error **errp)
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{
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int fd;
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trace_qio_channel_socket_dgram_sync(ioc, localAddr, remoteAddr);
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fd = socket_dgram(remoteAddr, localAddr, errp);
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if (fd < 0) {
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trace_qio_channel_socket_dgram_fail(ioc);
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return -1;
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}
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trace_qio_channel_socket_dgram_complete(ioc, fd);
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if (qio_channel_socket_set_fd(ioc, fd, errp) < 0) {
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close(fd);
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return -1;
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}
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return 0;
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}
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struct QIOChannelSocketDGramWorkerData {
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SocketAddress *localAddr;
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SocketAddress *remoteAddr;
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};
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static void qio_channel_socket_dgram_worker_free(gpointer opaque)
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{
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struct QIOChannelSocketDGramWorkerData *data = opaque;
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qapi_free_SocketAddress(data->localAddr);
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qapi_free_SocketAddress(data->remoteAddr);
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g_free(data);
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}
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static void qio_channel_socket_dgram_worker(QIOTask *task,
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gpointer opaque)
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{
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QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
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struct QIOChannelSocketDGramWorkerData *data = opaque;
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Error *err = NULL;
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/* socket_dgram() blocks in DNS lookups, so we must use a thread */
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qio_channel_socket_dgram_sync(ioc, data->localAddr,
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data->remoteAddr, &err);
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qio_task_set_error(task, err);
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}
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|
|
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void qio_channel_socket_dgram_async(QIOChannelSocket *ioc,
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SocketAddress *localAddr,
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SocketAddress *remoteAddr,
|
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QIOTaskFunc callback,
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gpointer opaque,
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GDestroyNotify destroy,
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GMainContext *context)
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{
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QIOTask *task = qio_task_new(
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OBJECT(ioc), callback, opaque, destroy);
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struct QIOChannelSocketDGramWorkerData *data = g_new0(
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struct QIOChannelSocketDGramWorkerData, 1);
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data->localAddr = QAPI_CLONE(SocketAddress, localAddr);
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data->remoteAddr = QAPI_CLONE(SocketAddress, remoteAddr);
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trace_qio_channel_socket_dgram_async(ioc, localAddr, remoteAddr);
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qio_task_run_in_thread(task,
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qio_channel_socket_dgram_worker,
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data,
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qio_channel_socket_dgram_worker_free,
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context);
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}
|
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|
|
|
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QIOChannelSocket *
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qio_channel_socket_accept(QIOChannelSocket *ioc,
|
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Error **errp)
|
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{
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QIOChannelSocket *cioc;
|
|
|
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cioc = qio_channel_socket_new();
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cioc->remoteAddrLen = sizeof(ioc->remoteAddr);
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cioc->localAddrLen = sizeof(ioc->localAddr);
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|
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retry:
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trace_qio_channel_socket_accept(ioc);
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cioc->fd = qemu_accept(ioc->fd, (struct sockaddr *)&cioc->remoteAddr,
|
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&cioc->remoteAddrLen);
|
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if (cioc->fd < 0) {
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if (errno == EINTR) {
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goto retry;
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}
|
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error_setg_errno(errp, errno, "Unable to accept connection");
|
|
trace_qio_channel_socket_accept_fail(ioc);
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|
goto error;
|
|
}
|
|
|
|
if (getsockname(cioc->fd, (struct sockaddr *)&cioc->localAddr,
|
|
&cioc->localAddrLen) < 0) {
|
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error_setg_errno(errp, errno,
|
|
"Unable to query local socket address");
|
|
goto error;
|
|
}
|
|
|
|
#ifndef WIN32
|
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if (cioc->localAddr.ss_family == AF_UNIX) {
|
|
QIOChannel *ioc_local = QIO_CHANNEL(cioc);
|
|
qio_channel_set_feature(ioc_local, QIO_CHANNEL_FEATURE_FD_PASS);
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}
|
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#endif /* WIN32 */
|
|
|
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trace_qio_channel_socket_accept_complete(ioc, cioc, cioc->fd);
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|
return cioc;
|
|
|
|
error:
|
|
object_unref(OBJECT(cioc));
|
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return NULL;
|
|
}
|
|
|
|
static void qio_channel_socket_init(Object *obj)
|
|
{
|
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QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
|
|
ioc->fd = -1;
|
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}
|
|
|
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static void qio_channel_socket_finalize(Object *obj)
|
|
{
|
|
QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
|
|
|
|
if (ioc->fd != -1) {
|
|
QIOChannel *ioc_local = QIO_CHANNEL(ioc);
|
|
if (qio_channel_has_feature(ioc_local, QIO_CHANNEL_FEATURE_LISTEN)) {
|
|
Error *err = NULL;
|
|
|
|
socket_listen_cleanup(ioc->fd, &err);
|
|
if (err) {
|
|
error_report_err(err);
|
|
err = NULL;
|
|
}
|
|
}
|
|
#ifdef WIN32
|
|
WSAEventSelect(ioc->fd, NULL, 0);
|
|
#endif
|
|
closesocket(ioc->fd);
|
|
ioc->fd = -1;
|
|
}
|
|
}
|
|
|
|
|
|
#ifndef WIN32
|
|
static void qio_channel_socket_copy_fds(struct msghdr *msg,
|
|
int **fds, size_t *nfds)
|
|
{
|
|
struct cmsghdr *cmsg;
|
|
|
|
*nfds = 0;
|
|
*fds = NULL;
|
|
|
|
for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
|
|
int fd_size, i;
|
|
int gotfds;
|
|
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(int)) ||
|
|
cmsg->cmsg_level != SOL_SOCKET ||
|
|
cmsg->cmsg_type != SCM_RIGHTS) {
|
|
continue;
|
|
}
|
|
|
|
fd_size = cmsg->cmsg_len - CMSG_LEN(0);
|
|
|
|
if (!fd_size) {
|
|
continue;
|
|
}
|
|
|
|
gotfds = fd_size / sizeof(int);
|
|
*fds = g_renew(int, *fds, *nfds + gotfds);
|
|
memcpy(*fds + *nfds, CMSG_DATA(cmsg), fd_size);
|
|
|
|
for (i = 0; i < gotfds; i++) {
|
|
int fd = (*fds)[*nfds + i];
|
|
if (fd < 0) {
|
|
continue;
|
|
}
|
|
|
|
/* O_NONBLOCK is preserved across SCM_RIGHTS so reset it */
|
|
qemu_socket_set_block(fd);
|
|
|
|
#ifndef MSG_CMSG_CLOEXEC
|
|
qemu_set_cloexec(fd);
|
|
#endif
|
|
}
|
|
*nfds += gotfds;
|
|
}
|
|
}
|
|
|
|
|
|
static ssize_t qio_channel_socket_readv(QIOChannel *ioc,
|
|
const struct iovec *iov,
|
|
size_t niov,
|
|
int **fds,
|
|
size_t *nfds,
|
|
Error **errp)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
ssize_t ret;
|
|
struct msghdr msg = { NULL, };
|
|
char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)];
|
|
int sflags = 0;
|
|
|
|
memset(control, 0, CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS));
|
|
|
|
msg.msg_iov = (struct iovec *)iov;
|
|
msg.msg_iovlen = niov;
|
|
if (fds && nfds) {
|
|
msg.msg_control = control;
|
|
msg.msg_controllen = sizeof(control);
|
|
#ifdef MSG_CMSG_CLOEXEC
|
|
sflags |= MSG_CMSG_CLOEXEC;
|
|
#endif
|
|
|
|
}
|
|
|
|
retry:
|
|
ret = recvmsg(sioc->fd, &msg, sflags);
|
|
if (ret < 0) {
|
|
if (errno == EAGAIN) {
|
|
return QIO_CHANNEL_ERR_BLOCK;
|
|
}
|
|
if (errno == EINTR) {
|
|
goto retry;
|
|
}
|
|
|
|
error_setg_errno(errp, errno,
|
|
"Unable to read from socket");
|
|
return -1;
|
|
}
|
|
|
|
if (fds && nfds) {
|
|
qio_channel_socket_copy_fds(&msg, fds, nfds);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
|
|
const struct iovec *iov,
|
|
size_t niov,
|
|
int *fds,
|
|
size_t nfds,
|
|
int flags,
|
|
Error **errp)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
ssize_t ret;
|
|
struct msghdr msg = { NULL, };
|
|
char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)];
|
|
size_t fdsize = sizeof(int) * nfds;
|
|
struct cmsghdr *cmsg;
|
|
int sflags = 0;
|
|
|
|
memset(control, 0, CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS));
|
|
|
|
msg.msg_iov = (struct iovec *)iov;
|
|
msg.msg_iovlen = niov;
|
|
|
|
if (nfds) {
|
|
if (nfds > SOCKET_MAX_FDS) {
|
|
error_setg_errno(errp, EINVAL,
|
|
"Only %d FDs can be sent, got %zu",
|
|
SOCKET_MAX_FDS, nfds);
|
|
return -1;
|
|
}
|
|
|
|
msg.msg_control = control;
|
|
msg.msg_controllen = CMSG_SPACE(sizeof(int) * nfds);
|
|
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
cmsg->cmsg_len = CMSG_LEN(fdsize);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
memcpy(CMSG_DATA(cmsg), fds, fdsize);
|
|
}
|
|
|
|
if (flags & QIO_CHANNEL_WRITE_FLAG_ZERO_COPY) {
|
|
#ifdef QEMU_MSG_ZEROCOPY
|
|
sflags = MSG_ZEROCOPY;
|
|
#else
|
|
/*
|
|
* We expect QIOChannel class entry point to have
|
|
* blocked this code path already
|
|
*/
|
|
g_assert_not_reached();
|
|
#endif
|
|
}
|
|
|
|
retry:
|
|
ret = sendmsg(sioc->fd, &msg, sflags);
|
|
if (ret <= 0) {
|
|
switch (errno) {
|
|
case EAGAIN:
|
|
return QIO_CHANNEL_ERR_BLOCK;
|
|
case EINTR:
|
|
goto retry;
|
|
case ENOBUFS:
|
|
if (flags & QIO_CHANNEL_WRITE_FLAG_ZERO_COPY) {
|
|
error_setg_errno(errp, errno,
|
|
"Process can't lock enough memory for using MSG_ZEROCOPY");
|
|
return -1;
|
|
}
|
|
break;
|
|
}
|
|
|
|
error_setg_errno(errp, errno,
|
|
"Unable to write to socket");
|
|
return -1;
|
|
}
|
|
|
|
if (flags & QIO_CHANNEL_WRITE_FLAG_ZERO_COPY) {
|
|
sioc->zero_copy_queued++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#else /* WIN32 */
|
|
static ssize_t qio_channel_socket_readv(QIOChannel *ioc,
|
|
const struct iovec *iov,
|
|
size_t niov,
|
|
int **fds,
|
|
size_t *nfds,
|
|
Error **errp)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
ssize_t done = 0;
|
|
ssize_t i;
|
|
|
|
for (i = 0; i < niov; i++) {
|
|
ssize_t ret;
|
|
retry:
|
|
ret = recv(sioc->fd,
|
|
iov[i].iov_base,
|
|
iov[i].iov_len,
|
|
0);
|
|
if (ret < 0) {
|
|
if (errno == EAGAIN) {
|
|
if (done) {
|
|
return done;
|
|
} else {
|
|
return QIO_CHANNEL_ERR_BLOCK;
|
|
}
|
|
} else if (errno == EINTR) {
|
|
goto retry;
|
|
} else {
|
|
error_setg_errno(errp, errno,
|
|
"Unable to read from socket");
|
|
return -1;
|
|
}
|
|
}
|
|
done += ret;
|
|
if (ret < iov[i].iov_len) {
|
|
return done;
|
|
}
|
|
}
|
|
|
|
return done;
|
|
}
|
|
|
|
static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
|
|
const struct iovec *iov,
|
|
size_t niov,
|
|
int *fds,
|
|
size_t nfds,
|
|
int flags,
|
|
Error **errp)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
ssize_t done = 0;
|
|
ssize_t i;
|
|
|
|
for (i = 0; i < niov; i++) {
|
|
ssize_t ret;
|
|
retry:
|
|
ret = send(sioc->fd,
|
|
iov[i].iov_base,
|
|
iov[i].iov_len,
|
|
0);
|
|
if (ret < 0) {
|
|
if (errno == EAGAIN) {
|
|
if (done) {
|
|
return done;
|
|
} else {
|
|
return QIO_CHANNEL_ERR_BLOCK;
|
|
}
|
|
} else if (errno == EINTR) {
|
|
goto retry;
|
|
} else {
|
|
error_setg_errno(errp, errno,
|
|
"Unable to write to socket");
|
|
return -1;
|
|
}
|
|
}
|
|
done += ret;
|
|
if (ret < iov[i].iov_len) {
|
|
return done;
|
|
}
|
|
}
|
|
|
|
return done;
|
|
}
|
|
#endif /* WIN32 */
|
|
|
|
|
|
#ifdef QEMU_MSG_ZEROCOPY
|
|
static int qio_channel_socket_flush(QIOChannel *ioc,
|
|
Error **errp)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
struct msghdr msg = {};
|
|
struct sock_extended_err *serr;
|
|
struct cmsghdr *cm;
|
|
char control[CMSG_SPACE(sizeof(*serr))];
|
|
int received;
|
|
int ret;
|
|
|
|
if (sioc->zero_copy_queued == sioc->zero_copy_sent) {
|
|
return 0;
|
|
}
|
|
|
|
msg.msg_control = control;
|
|
msg.msg_controllen = sizeof(control);
|
|
memset(control, 0, sizeof(control));
|
|
|
|
ret = 1;
|
|
|
|
while (sioc->zero_copy_sent < sioc->zero_copy_queued) {
|
|
received = recvmsg(sioc->fd, &msg, MSG_ERRQUEUE);
|
|
if (received < 0) {
|
|
switch (errno) {
|
|
case EAGAIN:
|
|
/* Nothing on errqueue, wait until something is available */
|
|
qio_channel_wait(ioc, G_IO_ERR);
|
|
continue;
|
|
case EINTR:
|
|
continue;
|
|
default:
|
|
error_setg_errno(errp, errno,
|
|
"Unable to read errqueue");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
cm = CMSG_FIRSTHDR(&msg);
|
|
if (cm->cmsg_level != SOL_IP && cm->cmsg_type != IP_RECVERR &&
|
|
cm->cmsg_level != SOL_IPV6 && cm->cmsg_type != IPV6_RECVERR) {
|
|
error_setg_errno(errp, EPROTOTYPE,
|
|
"Wrong cmsg in errqueue");
|
|
return -1;
|
|
}
|
|
|
|
serr = (void *) CMSG_DATA(cm);
|
|
if (serr->ee_errno != SO_EE_ORIGIN_NONE) {
|
|
error_setg_errno(errp, serr->ee_errno,
|
|
"Error on socket");
|
|
return -1;
|
|
}
|
|
if (serr->ee_origin != SO_EE_ORIGIN_ZEROCOPY) {
|
|
error_setg_errno(errp, serr->ee_origin,
|
|
"Error not from zero copy");
|
|
return -1;
|
|
}
|
|
|
|
/* No errors, count successfully finished sendmsg()*/
|
|
sioc->zero_copy_sent += serr->ee_data - serr->ee_info + 1;
|
|
|
|
/* If any sendmsg() succeeded using zero copy, return 0 at the end */
|
|
if (serr->ee_code != SO_EE_CODE_ZEROCOPY_COPIED) {
|
|
ret = 0;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* QEMU_MSG_ZEROCOPY */
|
|
|
|
static int
|
|
qio_channel_socket_set_blocking(QIOChannel *ioc,
|
|
bool enabled,
|
|
Error **errp)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
|
|
if (enabled) {
|
|
qemu_socket_set_block(sioc->fd);
|
|
} else {
|
|
qemu_socket_set_nonblock(sioc->fd);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void
|
|
qio_channel_socket_set_delay(QIOChannel *ioc,
|
|
bool enabled)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
int v = enabled ? 0 : 1;
|
|
|
|
setsockopt(sioc->fd,
|
|
IPPROTO_TCP, TCP_NODELAY,
|
|
&v, sizeof(v));
|
|
}
|
|
|
|
|
|
static void
|
|
qio_channel_socket_set_cork(QIOChannel *ioc,
|
|
bool enabled)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
int v = enabled ? 1 : 0;
|
|
|
|
socket_set_cork(sioc->fd, v);
|
|
}
|
|
|
|
|
|
static int
|
|
qio_channel_socket_close(QIOChannel *ioc,
|
|
Error **errp)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
int rc = 0;
|
|
Error *err = NULL;
|
|
|
|
if (sioc->fd != -1) {
|
|
#ifdef WIN32
|
|
WSAEventSelect(sioc->fd, NULL, 0);
|
|
#endif
|
|
if (qio_channel_has_feature(ioc, QIO_CHANNEL_FEATURE_LISTEN)) {
|
|
socket_listen_cleanup(sioc->fd, errp);
|
|
}
|
|
|
|
if (closesocket(sioc->fd) < 0) {
|
|
sioc->fd = -1;
|
|
error_setg_errno(&err, errno, "Unable to close socket");
|
|
error_propagate(errp, err);
|
|
return -1;
|
|
}
|
|
sioc->fd = -1;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
qio_channel_socket_shutdown(QIOChannel *ioc,
|
|
QIOChannelShutdown how,
|
|
Error **errp)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
int sockhow;
|
|
|
|
switch (how) {
|
|
case QIO_CHANNEL_SHUTDOWN_READ:
|
|
sockhow = SHUT_RD;
|
|
break;
|
|
case QIO_CHANNEL_SHUTDOWN_WRITE:
|
|
sockhow = SHUT_WR;
|
|
break;
|
|
case QIO_CHANNEL_SHUTDOWN_BOTH:
|
|
default:
|
|
sockhow = SHUT_RDWR;
|
|
break;
|
|
}
|
|
|
|
if (shutdown(sioc->fd, sockhow) < 0) {
|
|
error_setg_errno(errp, errno,
|
|
"Unable to shutdown socket");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void qio_channel_socket_set_aio_fd_handler(QIOChannel *ioc,
|
|
AioContext *ctx,
|
|
IOHandler *io_read,
|
|
IOHandler *io_write,
|
|
void *opaque)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
aio_set_fd_handler(ctx, sioc->fd, false,
|
|
io_read, io_write, NULL, NULL, opaque);
|
|
}
|
|
|
|
static GSource *qio_channel_socket_create_watch(QIOChannel *ioc,
|
|
GIOCondition condition)
|
|
{
|
|
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
|
|
return qio_channel_create_socket_watch(ioc,
|
|
sioc->fd,
|
|
condition);
|
|
}
|
|
|
|
static void qio_channel_socket_class_init(ObjectClass *klass,
|
|
void *class_data G_GNUC_UNUSED)
|
|
{
|
|
QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
|
|
|
|
ioc_klass->io_writev = qio_channel_socket_writev;
|
|
ioc_klass->io_readv = qio_channel_socket_readv;
|
|
ioc_klass->io_set_blocking = qio_channel_socket_set_blocking;
|
|
ioc_klass->io_close = qio_channel_socket_close;
|
|
ioc_klass->io_shutdown = qio_channel_socket_shutdown;
|
|
ioc_klass->io_set_cork = qio_channel_socket_set_cork;
|
|
ioc_klass->io_set_delay = qio_channel_socket_set_delay;
|
|
ioc_klass->io_create_watch = qio_channel_socket_create_watch;
|
|
ioc_klass->io_set_aio_fd_handler = qio_channel_socket_set_aio_fd_handler;
|
|
#ifdef QEMU_MSG_ZEROCOPY
|
|
ioc_klass->io_flush = qio_channel_socket_flush;
|
|
#endif
|
|
}
|
|
|
|
static const TypeInfo qio_channel_socket_info = {
|
|
.parent = TYPE_QIO_CHANNEL,
|
|
.name = TYPE_QIO_CHANNEL_SOCKET,
|
|
.instance_size = sizeof(QIOChannelSocket),
|
|
.instance_init = qio_channel_socket_init,
|
|
.instance_finalize = qio_channel_socket_finalize,
|
|
.class_init = qio_channel_socket_class_init,
|
|
};
|
|
|
|
static void qio_channel_socket_register_types(void)
|
|
{
|
|
type_register_static(&qio_channel_socket_info);
|
|
}
|
|
|
|
type_init(qio_channel_socket_register_types);
|