net/socket.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "qemu/osdep.h"
  25
  26 #include "net/net.h"
  27 #include "clients.h"
  28 #include "monitor/monitor.h"
  29 #include "qapi/error.h"
  30 #include "qemu/error-report.h"
  31 #include "qemu/option.h"
  32 #include "qemu/sockets.h"
  33 #include "qemu/iov.h"
  34 #include "qemu/main-loop.h"
  35
  36 typedef struct NetSocketState {
  37     NetClientState nc;
  38     int listen_fd;
  39     int fd;
  40     SocketReadState rs;
  41     unsigned int send_index;      /* number of bytes sent (only SOCK_STREAM) */
  42     struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
  43     IOHandler *send_fn;           /* differs between SOCK_STREAM/SOCK_DGRAM */
  44     bool read_poll;               /* waiting to receive data? */
  45     bool write_poll;              /* waiting to transmit data? */
  46 } NetSocketState;
  47
  48 static void net_socket_accept(void *opaque);
  49 static void net_socket_writable(void *opaque);
  50
  51 static void net_socket_update_fd_handler(NetSocketState *s)
  52 {
  53     qemu_set_fd_handler(s->fd,
  54                         s->read_poll ? s->send_fn : NULL,
  55                         s->write_poll ? net_socket_writable : NULL,
  56                         s);
  57 }
  58
  59 static void net_socket_read_poll(NetSocketState *s, bool enable)
  60 {
  61     s->read_poll = enable;
  62     net_socket_update_fd_handler(s);
  63 }
  64
  65 static void net_socket_write_poll(NetSocketState *s, bool enable)
  66 {
  67     s->write_poll = enable;
  68     net_socket_update_fd_handler(s);
  69 }
  70
  71 static void net_socket_writable(void *opaque)
  72 {
  73     NetSocketState *s = opaque;
  74
  75     net_socket_write_poll(s, false);
  76
  77     qemu_flush_queued_packets(&s->nc);
  78 }
  79
  80 static ssize_t net_socket_receive(NetClientState *nc, const uint8_t *buf, size_t size)
  81 {
  82     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
  83     uint32_t len = htonl(size);
  84     struct iovec iov[] = {
  85         {
  86             .iov_base = &len,
  87             .iov_len  = sizeof(len),
  88         }, {
  89             .iov_base = (void *)buf,
  90             .iov_len  = size,
  91         },
  92     };
  93     size_t remaining;
  94     ssize_t ret;
  95
  96     remaining = iov_size(iov, 2) - s->send_index;
  97     ret = iov_send(s->fd, iov, 2, s->send_index, remaining);
  98
  99     if (ret == -1 && errno == EAGAIN) {
 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         net_socket_write_poll(s, true);
 109         return 0;
 110     }
 111     s->send_index = 0;
 112     return size;
 113 }
 114
 115 static ssize_t net_socket_receive_dgram(NetClientState *nc, const uint8_t *buf, size_t size)
 116 {
 117     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
 118     ssize_t ret;
 119
 120     do {
 121         if (s->dgram_dst.sin_family != AF_UNIX) {
 122             ret = sendto(s->fd, buf, size, 0,
 123                          (struct sockaddr *)&s->dgram_dst,
 124                          sizeof(s->dgram_dst));
 125         } else {
 126             ret = send(s->fd, buf, size, 0);
 127         }
 128     } while (ret == -1 && errno == EINTR);
 129
 130     if (ret == -1 && errno == EAGAIN) {
 131         net_socket_write_poll(s, true);
 132         return 0;
 133     }
 134     return ret;
 135 }
 136
 137 static void net_socket_send_completed(NetClientState *nc, ssize_t len)
 138 {
 139     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
 140
 141     if (!s->read_poll) {
 142         net_socket_read_poll(s, true);
 143     }
 144 }
 145
 146 static void net_socket_rs_finalize(SocketReadState *rs)
 147 {
 148     NetSocketState *s = container_of(rs, NetSocketState, rs);
 149
 150     if (qemu_send_packet_async(&s->nc, rs->buf,
 151                                rs->packet_len,
 152                                net_socket_send_completed) == 0) {
 153         net_socket_read_poll(s, false);
 154     }
 155 }
 156
 157 static void net_socket_send(void *opaque)
 158 {
 159     NetSocketState *s = opaque;
 160     int size;
 161     int ret;
 162     uint8_t buf1[NET_BUFSIZE];
 163     const uint8_t *buf;
 164
 165     size = recv(s->fd, buf1, sizeof(buf1), 0);
 166     if (size < 0) {
 167         if (errno != EWOULDBLOCK)
 168             goto eoc;
 169     } else if (size == 0) {
 170         /* end of connection */
 171     eoc:
 172         net_socket_read_poll(s, false);
 173         net_socket_write_poll(s, false);
 174         if (s->listen_fd != -1) {
 175             qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
 176         }
 177         closesocket(s->fd);
 178
 179         s->fd = -1;
 180         net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
 181         s->nc.link_down = true;
 182         qemu_set_info_str(&s->nc, "%s", "");
 183
 184         return;
 185     }
 186     buf = buf1;
 187
 188     ret = net_fill_rstate(&s->rs, buf, size);
 189
 190     if (ret == -1) {
 191         goto eoc;
 192     }
 193 }
 194
 195 static void net_socket_send_dgram(void *opaque)
 196 {
 197     NetSocketState *s = opaque;
 198     int size;
 199
 200     size = recv(s->fd, s->rs.buf, sizeof(s->rs.buf), 0);
 201     if (size < 0)
 202         return;
 203     if (size == 0) {
 204         /* end of connection */
 205         net_socket_read_poll(s, false);
 206         net_socket_write_poll(s, false);
 207         return;
 208     }
 209     if (qemu_send_packet_async(&s->nc, s->rs.buf, size,
 210                                net_socket_send_completed) == 0) {
 211         net_socket_read_poll(s, false);
 212     }
 213 }
 214
 215 static int net_socket_mcast_create(struct sockaddr_in *mcastaddr,
 216                                    struct in_addr *localaddr,
 217                                    Error **errp)
 218 {
 219     struct ip_mreq imr;
 220     int fd;
 221     int val, ret;
 222 #ifdef __OpenBSD__
 223     unsigned char loop;
 224 #else
 225     int loop;
 226 #endif
 227
 228     if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
 229         error_setg(errp, "specified mcastaddr %s (0x%08x) "
 230                    "does not contain a multicast address",
 231                    inet_ntoa(mcastaddr->sin_addr),
 232                    (int)ntohl(mcastaddr->sin_addr.s_addr));
 233         return -1;
 234     }
 235
 236     fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
 237     if (fd < 0) {
 238         error_setg_errno(errp, errno, "can't create datagram socket");
 239         return -1;
 240     }
 241
 242     /* Allow multiple sockets to bind the same multicast ip and port by setting
 243      * SO_REUSEADDR. This is the only situation where SO_REUSEADDR should be set
 244      * on windows. Use socket_set_fast_reuse otherwise as it sets SO_REUSEADDR
 245      * only on posix systems.
 246      */
 247     val = 1;
 248     ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 249     if (ret < 0) {
 250         error_setg_errno(errp, errno,
 251                          "can't set socket option SO_REUSEADDR");
 252         goto fail;
 253     }
 254
 255     ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
 256     if (ret < 0) {
 257         error_setg_errno(errp, errno, "can't bind ip=%s to socket",
 258                          inet_ntoa(mcastaddr->sin_addr));
 259         goto fail;
 260     }
 261
 262     /* Add host to multicast group */
 263     imr.imr_multiaddr = mcastaddr->sin_addr;
 264     if (localaddr) {
 265         imr.imr_interface = *localaddr;
 266     } else {
 267         imr.imr_interface.s_addr = htonl(INADDR_ANY);
 268     }
 269
 270     ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 271                      &imr, sizeof(struct ip_mreq));
 272     if (ret < 0) {
 273         error_setg_errno(errp, errno,
 274                          "can't add socket to multicast group %s",
 275                          inet_ntoa(imr.imr_multiaddr));
 276         goto fail;
 277     }
 278
 279     /* Force mcast msgs to loopback (eg. several QEMUs in same host */
 280     loop = 1;
 281     ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
 282                      &loop, sizeof(loop));
 283     if (ret < 0) {
 284         error_setg_errno(errp, errno,
 285                          "can't force multicast message to loopback");
 286         goto fail;
 287     }
 288
 289     /* If a bind address is given, only send packets from that address */
 290     if (localaddr != NULL) {
 291         ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
 292                          localaddr, sizeof(*localaddr));
 293         if (ret < 0) {
 294             error_setg_errno(errp, errno,
 295                              "can't set the default network send interface");
 296             goto fail;
 297         }
 298     }
 299
 300     qemu_socket_set_nonblock(fd);
 301     return fd;
 302 fail:
 303     if (fd >= 0)
 304         closesocket(fd);
 305     return -1;
 306 }
 307
 308 static void net_socket_cleanup(NetClientState *nc)
 309 {
 310     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
 311     if (s->fd != -1) {
 312         net_socket_read_poll(s, false);
 313         net_socket_write_poll(s, false);
 314         close(s->fd);
 315         s->fd = -1;
 316     }
 317     if (s->listen_fd != -1) {
 318         qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
 319         closesocket(s->listen_fd);
 320         s->listen_fd = -1;
 321     }
 322 }
 323
 324 static NetClientInfo net_dgram_socket_info = {
 325     .type = NET_CLIENT_DRIVER_SOCKET,
 326     .size = sizeof(NetSocketState),
 327     .receive = net_socket_receive_dgram,
 328     .cleanup = net_socket_cleanup,
 329 };
 330
 331 static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer,
 332                                                 const char *model,
 333                                                 const char *name,
 334                                                 int fd, int is_connected,
 335                                                 const char *mcast,
 336                                                 Error **errp)
 337 {
 338     struct sockaddr_in saddr;
 339     int newfd;
 340     NetClientState *nc;
 341     NetSocketState *s;
 342     SocketAddress *sa;
 343     SocketAddressType sa_type;
 344
 345     sa = socket_local_address(fd, errp);
 346     if (!sa) {
 347         return NULL;
 348     }
 349     sa_type = sa->type;
 350     qapi_free_SocketAddress(sa);
 351
 352     /* fd passed: multicast: "learn" dgram_dst address from bound address and save it
 353      * Because this may be "shared" socket from a "master" process, datagrams would be recv()
 354      * by ONLY ONE process: we must "clone" this dgram socket --jjo
 355      */
 356
 357     if (is_connected && mcast != NULL) {
 358             if (parse_host_port(&saddr, mcast, errp) < 0) {
 359                 goto err;
 360             }
 361             /* must be bound */
 362             if (saddr.sin_addr.s_addr == 0) {
 363                 error_setg(errp, "can't setup multicast destination address");
 364                 goto err;
 365             }
 366             /* clone dgram socket */
 367             newfd = net_socket_mcast_create(&saddr, NULL, errp);
 368             if (newfd < 0) {
 369                 goto err;
 370             }
 371             /* clone newfd to fd, close newfd */
 372             dup2(newfd, fd);
 373             close(newfd);
 374
 375     }
 376
 377     nc = qemu_new_net_client(&net_dgram_socket_info, peer, model, name);
 378
 379     s = DO_UPCAST(NetSocketState, nc, nc);
 380
 381     s->fd = fd;
 382     s->listen_fd = -1;
 383     s->send_fn = net_socket_send_dgram;
 384     net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
 385     net_socket_read_poll(s, true);
 386
 387     /* mcast: save bound address as dst */
 388     if (is_connected && mcast != NULL) {
 389         s->dgram_dst = saddr;
 390         qemu_set_info_str(nc, "socket: fd=%d (cloned mcast=%s:%d)", fd,
 391                           inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 392     } else {
 393         if (sa_type == SOCKET_ADDRESS_TYPE_UNIX) {
 394             s->dgram_dst.sin_family = AF_UNIX;
 395         }
 396
 397         qemu_set_info_str(nc, "socket: fd=%d %s", fd,
 398                           SocketAddressType_str(sa_type));
 399     }
 400
 401     return s;
 402
 403 err:
 404     closesocket(fd);
 405     return NULL;
 406 }
 407
 408 static void net_socket_connect(void *opaque)
 409 {
 410     NetSocketState *s = opaque;
 411     s->send_fn = net_socket_send;
 412     net_socket_read_poll(s, true);
 413 }
 414
 415 static NetClientInfo net_socket_info = {
 416     .type = NET_CLIENT_DRIVER_SOCKET,
 417     .size = sizeof(NetSocketState),
 418     .receive = net_socket_receive,
 419     .cleanup = net_socket_cleanup,
 420 };
 421
 422 static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
 423                                                  const char *model,
 424                                                  const char *name,
 425                                                  int fd, int is_connected)
 426 {
 427     NetClientState *nc;
 428     NetSocketState *s;
 429
 430     nc = qemu_new_net_client(&net_socket_info, peer, model, name);
 431
 432     qemu_set_info_str(nc, "socket: fd=%d", fd);
 433
 434     s = DO_UPCAST(NetSocketState, nc, nc);
 435
 436     s->fd = fd;
 437     s->listen_fd = -1;
 438     net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
 439
 440     /* Disable Nagle algorithm on TCP sockets to reduce latency */
 441     socket_set_nodelay(fd);
 442
 443     if (is_connected) {
 444         net_socket_connect(s);
 445     } else {
 446         qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
 447     }
 448     return s;
 449 }
 450
 451 static NetSocketState *net_socket_fd_init(NetClientState *peer,
 452                                           const char *model, const char *name,
 453                                           int fd, int is_connected,
 454                                           const char *mc, Error **errp)
 455 {
 456     int so_type = -1, optlen=sizeof(so_type);
 457
 458     if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
 459         (socklen_t *)&optlen)< 0) {
 460         error_setg(errp, "can't get socket option SO_TYPE");
 461         closesocket(fd);
 462         return NULL;
 463     }
 464     switch(so_type) {
 465     case SOCK_DGRAM:
 466         return net_socket_fd_init_dgram(peer, model, name, fd, is_connected,
 467                                         mc, errp);
 468     case SOCK_STREAM:
 469         return net_socket_fd_init_stream(peer, model, name, fd, is_connected);
 470     default:
 471         error_setg(errp, "socket type=%d for fd=%d must be either"
 472                    " SOCK_DGRAM or SOCK_STREAM", so_type, fd);
 473         closesocket(fd);
 474     }
 475     return NULL;
 476 }
 477
 478 static void net_socket_accept(void *opaque)
 479 {
 480     NetSocketState *s = opaque;
 481     struct sockaddr_in saddr;
 482     socklen_t len;
 483     int fd;
 484
 485     for(;;) {
 486         len = sizeof(saddr);
 487         fd = qemu_accept(s->listen_fd, (struct sockaddr *)&saddr, &len);
 488         if (fd < 0 && errno != EINTR) {
 489             return;
 490         } else if (fd >= 0) {
 491             qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
 492             break;
 493         }
 494     }
 495
 496     s->fd = fd;
 497     s->nc.link_down = false;
 498     net_socket_connect(s);
 499     qemu_set_info_str(&s->nc, "socket: connection from %s:%d",
 500                       inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 501 }
 502
 503 static int net_socket_listen_init(NetClientState *peer,
 504                                   const char *model,
 505                                   const char *name,
 506                                   const char *host_str,
 507                                   Error **errp)
 508 {
 509     NetClientState *nc;
 510     NetSocketState *s;
 511     struct sockaddr_in saddr;
 512     int fd, ret;
 513
 514     if (parse_host_port(&saddr, host_str, errp) < 0) {
 515         return -1;
 516     }
 517
 518     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 519     if (fd < 0) {
 520         error_setg_errno(errp, errno, "can't create stream socket");
 521         return -1;
 522     }
 523     qemu_socket_set_nonblock(fd);
 524
 525     socket_set_fast_reuse(fd);
 526
 527     ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 528     if (ret < 0) {
 529         error_setg_errno(errp, errno, "can't bind ip=%s to socket",
 530                          inet_ntoa(saddr.sin_addr));
 531         closesocket(fd);
 532         return -1;
 533     }
 534     ret = listen(fd, 0);
 535     if (ret < 0) {
 536         error_setg_errno(errp, errno, "can't listen on socket");
 537         closesocket(fd);
 538         return -1;
 539     }
 540
 541     nc = qemu_new_net_client(&net_socket_info, peer, model, name);
 542     s = DO_UPCAST(NetSocketState, nc, nc);
 543     s->fd = -1;
 544     s->listen_fd = fd;
 545     s->nc.link_down = true;
 546     net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
 547
 548     qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
 549     return 0;
 550 }
 551
 552 static int net_socket_connect_init(NetClientState *peer,
 553                                    const char *model,
 554                                    const char *name,
 555                                    const char *host_str,
 556                                    Error **errp)
 557 {
 558     NetSocketState *s;
 559     int fd, connected, ret;
 560     struct sockaddr_in saddr;
 561
 562     if (parse_host_port(&saddr, host_str, errp) < 0) {
 563         return -1;
 564     }
 565
 566     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 567     if (fd < 0) {
 568         error_setg_errno(errp, errno, "can't create stream socket");
 569         return -1;
 570     }
 571     qemu_socket_set_nonblock(fd);
 572
 573     connected = 0;
 574     for(;;) {
 575         ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 576         if (ret < 0) {
 577             if (errno == EINTR || errno == EWOULDBLOCK) {
 578                 /* continue */
 579             } else if (errno == EINPROGRESS ||
 580                        errno == EALREADY) {
 581                 break;
 582             } else {
 583                 error_setg_errno(errp, errno, "can't connect socket");
 584                 closesocket(fd);
 585                 return -1;
 586             }
 587         } else {
 588             connected = 1;
 589             break;
 590         }
 591     }
 592     s = net_socket_fd_init(peer, model, name, fd, connected, NULL, errp);
 593     if (!s) {
 594         return -1;
 595     }
 596
 597     qemu_set_info_str(&s->nc, "socket: connect to %s:%d",
 598                       inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 599     return 0;
 600 }
 601
 602 static int net_socket_mcast_init(NetClientState *peer,
 603                                  const char *model,
 604                                  const char *name,
 605                                  const char *host_str,
 606                                  const char *localaddr_str,
 607                                  Error **errp)
 608 {
 609     NetSocketState *s;
 610     int fd;
 611     struct sockaddr_in saddr;
 612     struct in_addr localaddr, *param_localaddr;
 613
 614     if (parse_host_port(&saddr, host_str, errp) < 0) {
 615         return -1;
 616     }
 617
 618     if (localaddr_str != NULL) {
 619         if (inet_aton(localaddr_str, &localaddr) == 0) {
 620             error_setg(errp, "localaddr '%s' is not a valid IPv4 address",
 621                        localaddr_str);
 622             return -1;
 623         }
 624         param_localaddr = &localaddr;
 625     } else {
 626         param_localaddr = NULL;
 627     }
 628
 629     fd = net_socket_mcast_create(&saddr, param_localaddr, errp);
 630     if (fd < 0) {
 631         return -1;
 632     }
 633
 634     s = net_socket_fd_init(peer, model, name, fd, 0, NULL, errp);
 635     if (!s) {
 636         return -1;
 637     }
 638
 639     s->dgram_dst = saddr;
 640
 641     qemu_set_info_str(&s->nc, "socket: mcast=%s:%d",
 642                       inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 643     return 0;
 644
 645 }
 646
 647 static int net_socket_udp_init(NetClientState *peer,
 648                                  const char *model,
 649                                  const char *name,
 650                                  const char *rhost,
 651                                  const char *lhost,
 652                                  Error **errp)
 653 {
 654     NetSocketState *s;
 655     int fd, ret;
 656     struct sockaddr_in laddr, raddr;
 657
 658     if (parse_host_port(&laddr, lhost, errp) < 0) {
 659         return -1;
 660     }
 661
 662     if (parse_host_port(&raddr, rhost, errp) < 0) {
 663         return -1;
 664     }
 665
 666     fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
 667     if (fd < 0) {
 668         error_setg_errno(errp, errno, "can't create datagram socket");
 669         return -1;
 670     }
 671
 672     ret = socket_set_fast_reuse(fd);
 673     if (ret < 0) {
 674         error_setg_errno(errp, errno,
 675                          "can't set socket option SO_REUSEADDR");
 676         closesocket(fd);
 677         return -1;
 678     }
 679     ret = bind(fd, (struct sockaddr *)&laddr, sizeof(laddr));
 680     if (ret < 0) {
 681         error_setg_errno(errp, errno, "can't bind ip=%s to socket",
 682                          inet_ntoa(laddr.sin_addr));
 683         closesocket(fd);
 684         return -1;
 685     }
 686     qemu_socket_set_nonblock(fd);
 687
 688     s = net_socket_fd_init(peer, model, name, fd, 0, NULL, errp);
 689     if (!s) {
 690         return -1;
 691     }
 692
 693     s->dgram_dst = raddr;
 694
 695     qemu_set_info_str(&s->nc, "socket: udp=%s:%d", inet_ntoa(raddr.sin_addr),
 696                       ntohs(raddr.sin_port));
 697     return 0;
 698 }
 699
 700 int net_init_socket(const Netdev *netdev, const char *name,
 701                     NetClientState *peer, Error **errp)
 702 {
 703     const NetdevSocketOptions *sock;
 704
 705     assert(netdev->type == NET_CLIENT_DRIVER_SOCKET);
 706     sock = &netdev->u.socket;
 707
 708     if (sock->has_fd + sock->has_listen + sock->has_connect + sock->has_mcast +
 709         sock->has_udp != 1) {
 710         error_setg(errp, "exactly one of listen=, connect=, mcast= or udp="
 711                    " is required");
 712         return -1;
 713     }
 714
 715     if (sock->has_localaddr && !sock->has_mcast && !sock->has_udp) {
 716         error_setg(errp, "localaddr= is only valid with mcast= or udp=");
 717         return -1;
 718     }
 719
 720     if (sock->has_fd) {
 721         int fd, ret;
 722
 723         fd = monitor_fd_param(monitor_cur(), sock->fd, errp);
 724         if (fd == -1) {
 725             return -1;
 726         }
 727         ret = qemu_socket_try_set_nonblock(fd);
 728         if (ret < 0) {
 729             error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d",
 730                              name, fd);
 731             return -1;
 732         }
 733         if (!net_socket_fd_init(peer, "socket", name, fd, 1, sock->mcast,
 734                                 errp)) {
 735             return -1;
 736         }
 737         return 0;
 738     }
 739
 740     if (sock->has_listen) {
 741         if (net_socket_listen_init(peer, "socket", name, sock->listen, errp)
 742             < 0) {
 743             return -1;
 744         }
 745         return 0;
 746     }
 747
 748     if (sock->has_connect) {
 749         if (net_socket_connect_init(peer, "socket", name, sock->connect, errp)
 750             < 0) {
 751             return -1;
 752         }
 753         return 0;
 754     }
 755
 756     if (sock->has_mcast) {
 757         /* if sock->localaddr is missing, it has been initialized to "all bits
 758          * zero" */
 759         if (net_socket_mcast_init(peer, "socket", name, sock->mcast,
 760                                   sock->localaddr, errp) < 0) {
 761             return -1;
 762         }
 763         return 0;
 764     }
 765
 766     assert(sock->has_udp);
 767     if (!sock->has_localaddr) {
 768         error_setg(errp, "localaddr= is mandatory with udp=");
 769         return -1;
 770     }
 771     if (net_socket_udp_init(peer, "socket", name, sock->udp, sock->localaddr,
 772                             errp) < 0) {
 773         return -1;
 774     }
 775     return 0;
 776 }