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/*
* net stream generic functions
*
* Copyright Red Hat
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/iov.h"
#include "qapi/error.h"
#include "net/net.h"
#include "io/channel.h"
#include "io/net-listener.h"
#include "stream_data.h"
static gboolean net_stream_data_writable(QIOChannel *ioc,
GIOCondition condition, gpointer data)
{
NetStreamData *d = data;
d->ioc_write_tag = 0;
qemu_flush_queued_packets(&d->nc);
return G_SOURCE_REMOVE;
}
ssize_t net_stream_data_receive(NetStreamData *d, const uint8_t *buf,
size_t size)
{
uint32_t len = htonl(size);
struct iovec iov[] = {
{
.iov_base = &len,
.iov_len = sizeof(len),
}, {
.iov_base = (void *)buf,
.iov_len = size,
},
};
struct iovec local_iov[2];
unsigned int nlocal_iov;
size_t remaining;
ssize_t ret;
remaining = iov_size(iov, 2) - d->send_index;
nlocal_iov = iov_copy(local_iov, 2, iov, 2, d->send_index, remaining);
ret = qio_channel_writev(d->ioc, local_iov, nlocal_iov, NULL);
if (ret == QIO_CHANNEL_ERR_BLOCK) {
ret = 0; /* handled further down */
}
if (ret == -1) {
d->send_index = 0;
return -errno;
}
if (ret < (ssize_t)remaining) {
d->send_index += ret;
d->ioc_write_tag = qio_channel_add_watch(d->ioc, G_IO_OUT,
net_stream_data_writable, d,
NULL);
return 0;
}
d->send_index = 0;
return size;
}
static void net_stream_data_send_completed(NetClientState *nc, ssize_t len)
{
NetStreamData *d = DO_UPCAST(NetStreamData, nc, nc);
if (!d->ioc_read_tag) {
d->ioc_read_tag = qio_channel_add_watch(d->ioc, G_IO_IN, d->send, d,
NULL);
}
}
void net_stream_data_rs_finalize(SocketReadState *rs)
{
NetStreamData *d = container_of(rs, NetStreamData, rs);
if (qemu_send_packet_async(&d->nc, rs->buf,
rs->packet_len,
net_stream_data_send_completed) == 0) {
if (d->ioc_read_tag) {
g_source_remove(d->ioc_read_tag);
d->ioc_read_tag = 0;
}
}
}
gboolean net_stream_data_send(QIOChannel *ioc, GIOCondition condition,
NetStreamData *d)
{
int size;
int ret;
QEMU_UNINITIALIZED char buf1[NET_BUFSIZE];
const char *buf;
size = qio_channel_read(d->ioc, buf1, sizeof(buf1), NULL);
if (size < 0) {
if (errno != EWOULDBLOCK) {
goto eoc;
}
} else if (size == 0) {
/* end of connection */
eoc:
d->ioc_read_tag = 0;
if (d->ioc_write_tag) {
g_source_remove(d->ioc_write_tag);
d->ioc_write_tag = 0;
}
if (d->listener) {
qemu_set_info_str(&d->nc, "listening");
qio_net_listener_set_client_func(d->listener,
d->listen, d, NULL);
}
object_unref(OBJECT(d->ioc));
d->ioc = NULL;
net_socket_rs_init(&d->rs, net_stream_data_rs_finalize, false);
d->nc.link_down = true;
return G_SOURCE_REMOVE;
}
buf = buf1;
ret = net_fill_rstate(&d->rs, (const uint8_t *)buf, size);
if (ret == -1) {
goto eoc;
}
return G_SOURCE_CONTINUE;
}
void net_stream_data_listen(QIONetListener *listener,
QIOChannelSocket *cioc,
NetStreamData *d)
{
object_ref(OBJECT(cioc));
qio_net_listener_set_client_func(d->listener, NULL, d, NULL);
d->ioc = QIO_CHANNEL(cioc);
qio_channel_set_name(d->ioc, "stream-server");
d->nc.link_down = false;
d->ioc_read_tag = qio_channel_add_watch(d->ioc, G_IO_IN, d->send, d, NULL);
}
int net_stream_data_client_connected(QIOTask *task, NetStreamData *d)
{
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(d->ioc);
SocketAddress *addr;
int ret;
Error *err = NULL;
if (qio_task_propagate_error(task, &err)) {
qemu_set_info_str(&d->nc, "error: %s", error_get_pretty(err));
error_free(err);
goto error;
}
addr = qio_channel_socket_get_remote_address(sioc, NULL);
g_assert(addr != NULL);
ret = qemu_socket_try_set_nonblock(sioc->fd);
if (addr->type == SOCKET_ADDRESS_TYPE_FD && ret < 0) {
qemu_set_info_str(&d->nc, "can't use file descriptor %s (errno %d)",
addr->u.fd.str, -ret);
qapi_free_SocketAddress(addr);
goto error;
}
g_assert(ret == 0);
qapi_free_SocketAddress(addr);
net_socket_rs_init(&d->rs, net_stream_data_rs_finalize, false);
/* Disable Nagle algorithm on TCP sockets to reduce latency */
qio_channel_set_delay(d->ioc, false);
d->ioc_read_tag = qio_channel_add_watch(d->ioc, G_IO_IN, d->send, d, NULL);
d->nc.link_down = false;
return 0;
error:
object_unref(OBJECT(d->ioc));
d->ioc = NULL;
return -1;
}
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