net/stream.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2022 Red Hat, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27
  28 #include "net/net.h"
  29 #include "clients.h"
  30 #include "monitor/monitor.h"
  31 #include "qapi/error.h"
  32 #include "qemu/error-report.h"
  33 #include "qemu/option.h"
  34 #include "qemu/sockets.h"
  35 #include "qemu/iov.h"
  36 #include "qemu/main-loop.h"
  37 #include "qemu/cutils.h"
  38 #include "io/channel.h"
  39 #include "io/channel-socket.h"
  40 #include "io/net-listener.h"
  41 #include "qapi/qapi-events-net.h"
  42 #include "qapi/qapi-visit-sockets.h"
  43 #include "qapi/clone-visitor.h"
  44
  45 typedef struct NetStreamState {
  46     NetClientState nc;
  47     QIOChannel *listen_ioc;
  48     QIONetListener *listener;
  49     QIOChannel *ioc;
  50     guint ioc_read_tag;
  51     guint ioc_write_tag;
  52     SocketReadState rs;
  53     unsigned int send_index;      /* number of bytes sent*/
  54     uint32_t reconnect;
  55     guint timer_tag;
  56     SocketAddress *addr;
  57 } NetStreamState;
  58
  59 static void net_stream_listen(QIONetListener *listener,
  60                               QIOChannelSocket *cioc,
  61                               void *opaque);
  62 static void net_stream_arm_reconnect(NetStreamState *s);
  63
  64 static gboolean net_stream_writable(QIOChannel *ioc,
  65                                     GIOCondition condition,
  66                                     gpointer data)
  67 {
  68     NetStreamState *s = data;
  69
  70     s->ioc_write_tag = 0;
  71
  72     qemu_flush_queued_packets(&s->nc);
  73
  74     return G_SOURCE_REMOVE;
  75 }
  76
  77 static ssize_t net_stream_receive(NetClientState *nc, const uint8_t *buf,
  78                                   size_t size)
  79 {
  80     NetStreamState *s = DO_UPCAST(NetStreamState, nc, nc);
  81     uint32_t len = htonl(size);
  82     struct iovec iov[] = {
  83         {
  84             .iov_base = &len,
  85             .iov_len  = sizeof(len),
  86         }, {
  87             .iov_base = (void *)buf,
  88             .iov_len  = size,
  89         },
  90     };
  91     struct iovec local_iov[2];
  92     unsigned int nlocal_iov;
  93     size_t remaining;
  94     ssize_t ret;
  95
  96     remaining = iov_size(iov, 2) - s->send_index;
  97     nlocal_iov = iov_copy(local_iov, 2, iov, 2, s->send_index, remaining);
  98     ret = qio_channel_writev(s->ioc, local_iov, nlocal_iov, NULL);
  99     if (ret == QIO_CHANNEL_ERR_BLOCK) {
 100         ret = 0; /* handled further down */
 101     }
 102     if (ret == -1) {
 103         s->send_index = 0;
 104         return -errno;
 105     }
 106     if (ret < (ssize_t)remaining) {
 107         s->send_index += ret;
 108         s->ioc_write_tag = qio_channel_add_watch(s->ioc, G_IO_OUT,
 109                                                  net_stream_writable, s, NULL);
 110         return 0;
 111     }
 112     s->send_index = 0;
 113     return size;
 114 }
 115
 116 static gboolean net_stream_send(QIOChannel *ioc,
 117                                 GIOCondition condition,
 118                                 gpointer data);
 119
 120 static void net_stream_send_completed(NetClientState *nc, ssize_t len)
 121 {
 122     NetStreamState *s = DO_UPCAST(NetStreamState, nc, nc);
 123
 124     if (!s->ioc_read_tag) {
 125         s->ioc_read_tag = qio_channel_add_watch(s->ioc, G_IO_IN,
 126                                                 net_stream_send, s, NULL);
 127     }
 128 }
 129
 130 static void net_stream_rs_finalize(SocketReadState *rs)
 131 {
 132     NetStreamState *s = container_of(rs, NetStreamState, rs);
 133
 134     if (qemu_send_packet_async(&s->nc, rs->buf,
 135                                rs->packet_len,
 136                                net_stream_send_completed) == 0) {
 137         if (s->ioc_read_tag) {
 138             g_source_remove(s->ioc_read_tag);
 139             s->ioc_read_tag = 0;
 140         }
 141     }
 142 }
 143
 144 static gboolean net_stream_send(QIOChannel *ioc,
 145                                 GIOCondition condition,
 146                                 gpointer data)
 147 {
 148     NetStreamState *s = data;
 149     int size;
 150     int ret;
 151     char buf1[NET_BUFSIZE];
 152     const char *buf;
 153
 154     size = qio_channel_read(s->ioc, buf1, sizeof(buf1), NULL);
 155     if (size < 0) {
 156         if (errno != EWOULDBLOCK) {
 157             goto eoc;
 158         }
 159     } else if (size == 0) {
 160         /* end of connection */
 161     eoc:
 162         s->ioc_read_tag = 0;
 163         if (s->ioc_write_tag) {
 164             g_source_remove(s->ioc_write_tag);
 165             s->ioc_write_tag = 0;
 166         }
 167         if (s->listener) {
 168             qio_net_listener_set_client_func(s->listener, net_stream_listen,
 169                                              s, NULL);
 170         }
 171         object_unref(OBJECT(s->ioc));
 172         s->ioc = NULL;
 173
 174         net_socket_rs_init(&s->rs, net_stream_rs_finalize, false);
 175         s->nc.link_down = true;
 176         qemu_set_info_str(&s->nc, "%s", "");
 177
 178         qapi_event_send_netdev_stream_disconnected(s->nc.name);
 179         net_stream_arm_reconnect(s);
 180
 181         return G_SOURCE_REMOVE;
 182     }
 183     buf = buf1;
 184
 185     ret = net_fill_rstate(&s->rs, (const uint8_t *)buf, size);
 186
 187     if (ret == -1) {
 188         goto eoc;
 189     }
 190
 191     return G_SOURCE_CONTINUE;
 192 }
 193
 194 static void net_stream_cleanup(NetClientState *nc)
 195 {
 196     NetStreamState *s = DO_UPCAST(NetStreamState, nc, nc);
 197     if (s->timer_tag) {
 198         g_source_remove(s->timer_tag);
 199         s->timer_tag = 0;
 200     }
 201     if (s->addr) {
 202         qapi_free_SocketAddress(s->addr);
 203         s->addr = NULL;
 204     }
 205     if (s->ioc) {
 206         if (QIO_CHANNEL_SOCKET(s->ioc)->fd != -1) {
 207             if (s->ioc_read_tag) {
 208                 g_source_remove(s->ioc_read_tag);
 209                 s->ioc_read_tag = 0;
 210             }
 211             if (s->ioc_write_tag) {
 212                 g_source_remove(s->ioc_write_tag);
 213                 s->ioc_write_tag = 0;
 214             }
 215         }
 216         object_unref(OBJECT(s->ioc));
 217         s->ioc = NULL;
 218     }
 219     if (s->listen_ioc) {
 220         if (s->listener) {
 221             qio_net_listener_disconnect(s->listener);
 222             object_unref(OBJECT(s->listener));
 223             s->listener = NULL;
 224         }
 225         object_unref(OBJECT(s->listen_ioc));
 226         s->listen_ioc = NULL;
 227     }
 228 }
 229
 230 static NetClientInfo net_stream_info = {
 231     .type = NET_CLIENT_DRIVER_STREAM,
 232     .size = sizeof(NetStreamState),
 233     .receive = net_stream_receive,
 234     .cleanup = net_stream_cleanup,
 235 };
 236
 237 static void net_stream_listen(QIONetListener *listener,
 238                               QIOChannelSocket *cioc,
 239                               void *opaque)
 240 {
 241     NetStreamState *s = opaque;
 242     SocketAddress *addr;
 243     char *uri;
 244
 245     object_ref(OBJECT(cioc));
 246
 247     qio_net_listener_set_client_func(s->listener, NULL, s, NULL);
 248
 249     s->ioc = QIO_CHANNEL(cioc);
 250     qio_channel_set_name(s->ioc, "stream-server");
 251     s->nc.link_down = false;
 252
 253     s->ioc_read_tag = qio_channel_add_watch(s->ioc, G_IO_IN, net_stream_send,
 254                                             s, NULL);
 255
 256     if (cioc->localAddr.ss_family == AF_UNIX) {
 257         addr = qio_channel_socket_get_local_address(cioc, NULL);
 258     } else {
 259         addr = qio_channel_socket_get_remote_address(cioc, NULL);
 260     }
 261     g_assert(addr != NULL);
 262     uri = socket_uri(addr);
 263     qemu_set_info_str(&s->nc, "%s", uri);
 264     g_free(uri);
 265     qapi_event_send_netdev_stream_connected(s->nc.name, addr);
 266     qapi_free_SocketAddress(addr);
 267 }
 268
 269 static void net_stream_server_listening(QIOTask *task, gpointer opaque)
 270 {
 271     NetStreamState *s = opaque;
 272     QIOChannelSocket *listen_sioc = QIO_CHANNEL_SOCKET(s->listen_ioc);
 273     SocketAddress *addr;
 274     int ret;
 275
 276     if (listen_sioc->fd < 0) {
 277         qemu_set_info_str(&s->nc, "connection error");
 278         return;
 279     }
 280
 281     addr = qio_channel_socket_get_local_address(listen_sioc, NULL);
 282     g_assert(addr != NULL);
 283     ret = qemu_socket_try_set_nonblock(listen_sioc->fd);
 284     if (addr->type == SOCKET_ADDRESS_TYPE_FD && ret < 0) {
 285         qemu_set_info_str(&s->nc, "can't use file descriptor %s (errno %d)",
 286                           addr->u.fd.str, -ret);
 287         return;
 288     }
 289     g_assert(ret == 0);
 290     qapi_free_SocketAddress(addr);
 291
 292     s->nc.link_down = true;
 293     s->listener = qio_net_listener_new();
 294
 295     net_socket_rs_init(&s->rs, net_stream_rs_finalize, false);
 296     qio_net_listener_set_client_func(s->listener, net_stream_listen, s, NULL);
 297     qio_net_listener_add(s->listener, listen_sioc);
 298 }
 299
 300 static int net_stream_server_init(NetClientState *peer,
 301                                   const char *model,
 302                                   const char *name,
 303                                   SocketAddress *addr,
 304                                   Error **errp)
 305 {
 306     NetClientState *nc;
 307     NetStreamState *s;
 308     QIOChannelSocket *listen_sioc = qio_channel_socket_new();
 309
 310     nc = qemu_new_net_client(&net_stream_info, peer, model, name);
 311     s = DO_UPCAST(NetStreamState, nc, nc);
 312
 313     s->listen_ioc = QIO_CHANNEL(listen_sioc);
 314     qio_channel_socket_listen_async(listen_sioc, addr, 0,
 315                                     net_stream_server_listening, s,
 316                                     NULL, NULL);
 317
 318     return 0;
 319 }
 320
 321 static void net_stream_client_connected(QIOTask *task, gpointer opaque)
 322 {
 323     NetStreamState *s = opaque;
 324     QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(s->ioc);
 325     SocketAddress *addr;
 326     gchar *uri;
 327     int ret;
 328
 329     if (sioc->fd < 0) {
 330         qemu_set_info_str(&s->nc, "connection error");
 331         goto error;
 332     }
 333
 334     addr = qio_channel_socket_get_remote_address(sioc, NULL);
 335     g_assert(addr != NULL);
 336     uri = socket_uri(addr);
 337     qemu_set_info_str(&s->nc, "%s", uri);
 338     g_free(uri);
 339
 340     ret = qemu_socket_try_set_nonblock(sioc->fd);
 341     if (addr->type == SOCKET_ADDRESS_TYPE_FD && ret < 0) {
 342         qemu_set_info_str(&s->nc, "can't use file descriptor %s (errno %d)",
 343                           addr->u.fd.str, -ret);
 344         qapi_free_SocketAddress(addr);
 345         goto error;
 346     }
 347     g_assert(ret == 0);
 348
 349     net_socket_rs_init(&s->rs, net_stream_rs_finalize, false);
 350
 351     /* Disable Nagle algorithm on TCP sockets to reduce latency */
 352     qio_channel_set_delay(s->ioc, false);
 353
 354     s->ioc_read_tag = qio_channel_add_watch(s->ioc, G_IO_IN, net_stream_send,
 355                                             s, NULL);
 356     s->nc.link_down = false;
 357     qapi_event_send_netdev_stream_connected(s->nc.name, addr);
 358     qapi_free_SocketAddress(addr);
 359
 360     return;
 361 error:
 362     object_unref(OBJECT(s->ioc));
 363     s->ioc = NULL;
 364     net_stream_arm_reconnect(s);
 365 }
 366
 367 static gboolean net_stream_reconnect(gpointer data)
 368 {
 369     NetStreamState *s = data;
 370     QIOChannelSocket *sioc;
 371
 372     s->timer_tag = 0;
 373
 374     sioc = qio_channel_socket_new();
 375     s->ioc = QIO_CHANNEL(sioc);
 376     qio_channel_socket_connect_async(sioc, s->addr,
 377                                      net_stream_client_connected, s,
 378                                      NULL, NULL);
 379     return G_SOURCE_REMOVE;
 380 }
 381
 382 static void net_stream_arm_reconnect(NetStreamState *s)
 383 {
 384     if (s->reconnect && s->timer_tag == 0) {
 385         s->timer_tag = g_timeout_add_seconds(s->reconnect,
 386                                              net_stream_reconnect, s);
 387     }
 388 }
 389
 390 static int net_stream_client_init(NetClientState *peer,
 391                                   const char *model,
 392                                   const char *name,
 393                                   SocketAddress *addr,
 394                                   uint32_t reconnect,
 395                                   Error **errp)
 396 {
 397     NetStreamState *s;
 398     NetClientState *nc;
 399     QIOChannelSocket *sioc = qio_channel_socket_new();
 400
 401     nc = qemu_new_net_client(&net_stream_info, peer, model, name);
 402     s = DO_UPCAST(NetStreamState, nc, nc);
 403
 404     s->ioc = QIO_CHANNEL(sioc);
 405     s->nc.link_down = true;
 406
 407     s->reconnect = reconnect;
 408     if (reconnect) {
 409         s->addr = QAPI_CLONE(SocketAddress, addr);
 410     }
 411     qio_channel_socket_connect_async(sioc, addr,
 412                                      net_stream_client_connected, s,
 413                                      NULL, NULL);
 414
 415     return 0;
 416 }
 417
 418 int net_init_stream(const Netdev *netdev, const char *name,
 419                     NetClientState *peer, Error **errp)
 420 {
 421     const NetdevStreamOptions *sock;
 422
 423     assert(netdev->type == NET_CLIENT_DRIVER_STREAM);
 424     sock = &netdev->u.stream;
 425
 426     if (!sock->has_server || !sock->server) {
 427         return net_stream_client_init(peer, "stream", name, sock->addr,
 428                                       sock->has_reconnect ? sock->reconnect : 0,
 429                                       errp);
 430     }
 431     if (sock->has_reconnect) {
 432         error_setg(errp, "'reconnect' option is incompatible with "
 433                          "socket in server mode");
 434         return -1;
 435     }
 436     return net_stream_server_init(peer, "stream", name, sock->addr, errp);
 437 }