aboutsummaryrefslogtreecommitdiff
path: root/net/stream.c
blob: 37ff727e0c42fdd514ec853d50f139a8c14bae0f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 * Copyright (c) 2022 Red Hat, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"

#include "net/net.h"
#include "clients.h"
#include "monitor/monitor.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
#include "qemu/sockets.h"
#include "qemu/iov.h"
#include "qemu/main-loop.h"
#include "qemu/cutils.h"
#include "io/channel.h"
#include "io/channel-socket.h"
#include "io/net-listener.h"
#include "qapi/qapi-events-net.h"

typedef struct NetStreamState {
    NetClientState nc;
    QIOChannel *listen_ioc;
    QIONetListener *listener;
    QIOChannel *ioc;
    guint ioc_read_tag;
    guint ioc_write_tag;
    SocketReadState rs;
    unsigned int send_index;      /* number of bytes sent*/
} NetStreamState;

static void net_stream_listen(QIONetListener *listener,
                              QIOChannelSocket *cioc,
                              void *opaque);

static gboolean net_stream_writable(QIOChannel *ioc,
                                    GIOCondition condition,
                                    gpointer data)
{
    NetStreamState *s = data;

    s->ioc_write_tag = 0;

    qemu_flush_queued_packets(&s->nc);

    return G_SOURCE_REMOVE;
}

static ssize_t net_stream_receive(NetClientState *nc, const uint8_t *buf,
                                  size_t size)
{
    NetStreamState *s = DO_UPCAST(NetStreamState, nc, nc);
    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) - s->send_index;
    nlocal_iov = iov_copy(local_iov, 2, iov, 2, s->send_index, remaining);
    ret = qio_channel_writev(s->ioc, local_iov, nlocal_iov, NULL);
    if (ret == QIO_CHANNEL_ERR_BLOCK) {
        ret = 0; /* handled further down */
    }
    if (ret == -1) {
        s->send_index = 0;
        return -errno;
    }
    if (ret < (ssize_t)remaining) {
        s->send_index += ret;
        s->ioc_write_tag = qio_channel_add_watch(s->ioc, G_IO_OUT,
                                                 net_stream_writable, s, NULL);
        return 0;
    }
    s->send_index = 0;
    return size;
}

static gboolean net_stream_send(QIOChannel *ioc,
                                GIOCondition condition,
                                gpointer data);

static void net_stream_send_completed(NetClientState *nc, ssize_t len)
{
    NetStreamState *s = DO_UPCAST(NetStreamState, nc, nc);

    if (!s->ioc_read_tag) {
        s->ioc_read_tag = qio_channel_add_watch(s->ioc, G_IO_IN,
                                                net_stream_send, s, NULL);
    }
}

static void net_stream_rs_finalize(SocketReadState *rs)
{
    NetStreamState *s = container_of(rs, NetStreamState, rs);

    if (qemu_send_packet_async(&s->nc, rs->buf,
                               rs->packet_len,
                               net_stream_send_completed) == 0) {
        if (s->ioc_read_tag) {
            g_source_remove(s->ioc_read_tag);
            s->ioc_read_tag = 0;
        }
    }
}

static gboolean net_stream_send(QIOChannel *ioc,
                                GIOCondition condition,
                                gpointer data)
{
    NetStreamState *s = data;
    int size;
    int ret;
    char buf1[NET_BUFSIZE];
    const char *buf;

    size = qio_channel_read(s->ioc, buf1, sizeof(buf1), NULL);
    if (size < 0) {
        if (errno != EWOULDBLOCK) {
            goto eoc;
        }
    } else if (size == 0) {
        /* end of connection */
    eoc:
        s->ioc_read_tag = 0;
        if (s->ioc_write_tag) {
            g_source_remove(s->ioc_write_tag);
            s->ioc_write_tag = 0;
        }
        if (s->listener) {
            qio_net_listener_set_client_func(s->listener, net_stream_listen,
                                             s, NULL);
        }
        object_unref(OBJECT(s->ioc));
        s->ioc = NULL;

        net_socket_rs_init(&s->rs, net_stream_rs_finalize, false);
        s->nc.link_down = true;
        qemu_set_info_str(&s->nc, "%s", "");

        qapi_event_send_netdev_stream_disconnected(s->nc.name);

        return G_SOURCE_REMOVE;
    }
    buf = buf1;

    ret = net_fill_rstate(&s->rs, (const uint8_t *)buf, size);

    if (ret == -1) {
        goto eoc;
    }

    return G_SOURCE_CONTINUE;
}

static void net_stream_cleanup(NetClientState *nc)
{
    NetStreamState *s = DO_UPCAST(NetStreamState, nc, nc);
    if (s->ioc) {
        if (QIO_CHANNEL_SOCKET(s->ioc)->fd != -1) {
            if (s->ioc_read_tag) {
                g_source_remove(s->ioc_read_tag);
                s->ioc_read_tag = 0;
            }
            if (s->ioc_write_tag) {
                g_source_remove(s->ioc_write_tag);
                s->ioc_write_tag = 0;
            }
        }
        object_unref(OBJECT(s->ioc));
        s->ioc = NULL;
    }
    if (s->listen_ioc) {
        if (s->listener) {
            qio_net_listener_disconnect(s->listener);
            object_unref(OBJECT(s->listener));
            s->listener = NULL;
        }
        object_unref(OBJECT(s->listen_ioc));
        s->listen_ioc = NULL;
    }
}

static NetClientInfo net_stream_info = {
    .type = NET_CLIENT_DRIVER_STREAM,
    .size = sizeof(NetStreamState),
    .receive = net_stream_receive,
    .cleanup = net_stream_cleanup,
};

static void net_stream_listen(QIONetListener *listener,
                              QIOChannelSocket *cioc,
                              void *opaque)
{
    NetStreamState *s = opaque;
    SocketAddress *addr;
    char *uri;

    object_ref(OBJECT(cioc));

    qio_net_listener_set_client_func(s->listener, NULL, s, NULL);

    s->ioc = QIO_CHANNEL(cioc);
    qio_channel_set_name(s->ioc, "stream-server");
    s->nc.link_down = false;

    s->ioc_read_tag = qio_channel_add_watch(s->ioc, G_IO_IN, net_stream_send,
                                            s, NULL);

    if (cioc->localAddr.ss_family == AF_UNIX) {
        addr = qio_channel_socket_get_local_address(cioc, NULL);
    } else {
        addr = qio_channel_socket_get_remote_address(cioc, NULL);
    }
    g_assert(addr != NULL);
    uri = socket_uri(addr);
    qemu_set_info_str(&s->nc, "%s", uri);
    g_free(uri);
    qapi_event_send_netdev_stream_connected(s->nc.name, addr);
    qapi_free_SocketAddress(addr);
}

static void net_stream_server_listening(QIOTask *task, gpointer opaque)
{
    NetStreamState *s = opaque;
    QIOChannelSocket *listen_sioc = QIO_CHANNEL_SOCKET(s->listen_ioc);
    SocketAddress *addr;
    int ret;

    if (listen_sioc->fd < 0) {
        qemu_set_info_str(&s->nc, "connection error");
        return;
    }

    addr = qio_channel_socket_get_local_address(listen_sioc, NULL);
    g_assert(addr != NULL);
    ret = qemu_socket_try_set_nonblock(listen_sioc->fd);
    if (addr->type == SOCKET_ADDRESS_TYPE_FD && ret < 0) {
        qemu_set_info_str(&s->nc, "can't use file descriptor %s (errno %d)",
                          addr->u.fd.str, -ret);
        return;
    }
    g_assert(ret == 0);
    qapi_free_SocketAddress(addr);

    s->nc.link_down = true;
    s->listener = qio_net_listener_new();

    net_socket_rs_init(&s->rs, net_stream_rs_finalize, false);
    qio_net_listener_set_client_func(s->listener, net_stream_listen, s, NULL);
    qio_net_listener_add(s->listener, listen_sioc);
}

static int net_stream_server_init(NetClientState *peer,
                                  const char *model,
                                  const char *name,
                                  SocketAddress *addr,
                                  Error **errp)
{
    NetClientState *nc;
    NetStreamState *s;
    QIOChannelSocket *listen_sioc = qio_channel_socket_new();

    nc = qemu_new_net_client(&net_stream_info, peer, model, name);
    s = DO_UPCAST(NetStreamState, nc, nc);

    s->listen_ioc = QIO_CHANNEL(listen_sioc);
    qio_channel_socket_listen_async(listen_sioc, addr, 0,
                                    net_stream_server_listening, s,
                                    NULL, NULL);

    return 0;
}

static void net_stream_client_connected(QIOTask *task, gpointer opaque)
{
    NetStreamState *s = opaque;
    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(s->ioc);
    SocketAddress *addr;
    gchar *uri;
    int ret;

    if (sioc->fd < 0) {
        qemu_set_info_str(&s->nc, "connection error");
        goto error;
    }

    addr = qio_channel_socket_get_remote_address(sioc, NULL);
    g_assert(addr != NULL);
    uri = socket_uri(addr);
    qemu_set_info_str(&s->nc, "%s", uri);
    g_free(uri);

    ret = qemu_socket_try_set_nonblock(sioc->fd);
    if (addr->type == SOCKET_ADDRESS_TYPE_FD && ret < 0) {
        qemu_set_info_str(&s->nc, "can't use file descriptor %s (errno %d)",
                          addr->u.fd.str, -ret);
        qapi_free_SocketAddress(addr);
        goto error;
    }
    g_assert(ret == 0);

    net_socket_rs_init(&s->rs, net_stream_rs_finalize, false);

    /* Disable Nagle algorithm on TCP sockets to reduce latency */
    qio_channel_set_delay(s->ioc, false);

    s->ioc_read_tag = qio_channel_add_watch(s->ioc, G_IO_IN, net_stream_send,
                                            s, NULL);
    s->nc.link_down = false;
    qapi_event_send_netdev_stream_connected(s->nc.name, addr);
    qapi_free_SocketAddress(addr);

    return;
error:
    object_unref(OBJECT(s->ioc));
    s->ioc = NULL;
}

static int net_stream_client_init(NetClientState *peer,
                                  const char *model,
                                  const char *name,
                                  SocketAddress *addr,
                                  Error **errp)
{
    NetStreamState *s;
    NetClientState *nc;
    QIOChannelSocket *sioc = qio_channel_socket_new();

    nc = qemu_new_net_client(&net_stream_info, peer, model, name);
    s = DO_UPCAST(NetStreamState, nc, nc);

    s->ioc = QIO_CHANNEL(sioc);
    s->nc.link_down = true;

    qio_channel_socket_connect_async(sioc, addr,
                                     net_stream_client_connected, s,
                                     NULL, NULL);

    return 0;
}

int net_init_stream(const Netdev *netdev, const char *name,
                    NetClientState *peer, Error **errp)
{
    const NetdevStreamOptions *sock;

    assert(netdev->type == NET_CLIENT_DRIVER_STREAM);
    sock = &netdev->u.stream;

    if (!sock->has_server || !sock->server) {
        return net_stream_client_init(peer, "stream", name, sock->addr, errp);
    }
    return net_stream_server_init(peer, "stream", name, sock->addr, errp);
}