net/net.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
  25 #include "qemu/osdep.h"
  26
  27 #include "net/net.h"
  28 #include "clients.h"
  29 #include "hub.h"
  30 #include "net/slirp.h"
  31 #include "net/eth.h"
  32 #include "util.h"
  33
  34 #include "monitor/monitor.h"
  35 #include "qemu/help_option.h"
  36 #include "qapi/qmp/qdict.h"
  37 #include "qapi/qmp/qerror.h"
  38 #include "qemu/error-report.h"
  39 #include "qemu/sockets.h"
  40 #include "qemu/cutils.h"
  41 #include "qemu/config-file.h"
  42 #include "qmp-commands.h"
  43 #include "hw/qdev.h"
  44 #include "qemu/iov.h"
  45 #include "qemu/main-loop.h"
  46 #include "qemu/option.h"
  47 #include "qapi-visit.h"
  48 #include "qapi/error.h"
  49 #include "qapi/opts-visitor.h"
  50 #include "sysemu/sysemu.h"
  51 #include "sysemu/qtest.h"
  52 #include "net/filter.h"
  53 #include "qapi/string-output-visitor.h"
  54
  55 /* Net bridge is currently not supported for W32. */
  56 #if !defined(_WIN32)
  57 # define CONFIG_NET_BRIDGE
  58 #endif
  59
  60 static VMChangeStateEntry *net_change_state_entry;
  61 static QTAILQ_HEAD(, NetClientState) net_clients;
  62
  63 /***********************************************************/
  64 /* network device redirectors */
  65
  66 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  67 {
  68     const char *p, *p1;
  69     int len;
  70     p = *pp;
  71     p1 = strchr(p, sep);
  72     if (!p1)
  73         return -1;
  74     len = p1 - p;
  75     p1++;
  76     if (buf_size > 0) {
  77         if (len > buf_size - 1)
  78             len = buf_size - 1;
  79         memcpy(buf, p, len);
  80         buf[len] = '\0';
  81     }
  82     *pp = p1;
  83     return 0;
  84 }
  85
  86 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  87                     Error **errp)
  88 {
  89     char buf[512];
  90     struct hostent *he;
  91     const char *p, *r;
  92     int port;
  93
  94     p = str;
  95     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
  96         error_setg(errp, "host address '%s' doesn't contain ':' "
  97                    "separating host from port", str);
  98         return -1;
  99     }
 100     saddr->sin_family = AF_INET;
 101     if (buf[0] == '\0') {
 102         saddr->sin_addr.s_addr = 0;
 103     } else {
 104         if (qemu_isdigit(buf[0])) {
 105             if (!inet_aton(buf, &saddr->sin_addr)) {
 106                 error_setg(errp, "host address '%s' is not a valid "
 107                            "IPv4 address", buf);
 108                 return -1;
 109             }
 110         } else {
 111             he = gethostbyname(buf);
 112             if (he == NULL) {
 113                 error_setg(errp, "can't resolve host address '%s'", buf);
 114                 return - 1;
 115             }
 116             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 117         }
 118     }
 119     port = strtol(p, (char **)&r, 0);
 120     if (r == p) {
 121         error_setg(errp, "port number '%s' is invalid", p);
 122         return -1;
 123     }
 124     saddr->sin_port = htons(port);
 125     return 0;
 126 }
 127
 128 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 129 {
 130     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 131                            macaddr[0], macaddr[1], macaddr[2],
 132                            macaddr[3], macaddr[4], macaddr[5]);
 133 }
 134
 135 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 136 {
 137     snprintf(nc->info_str, sizeof(nc->info_str),
 138              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 139              nc->model,
 140              macaddr[0], macaddr[1], macaddr[2],
 141              macaddr[3], macaddr[4], macaddr[5]);
 142 }
 143
 144 static int mac_table[256] = {0};
 145
 146 static void qemu_macaddr_set_used(MACAddr *macaddr)
 147 {
 148     int index;
 149
 150     for (index = 0x56; index < 0xFF; index++) {
 151         if (macaddr->a[5] == index) {
 152             mac_table[index]++;
 153         }
 154     }
 155 }
 156
 157 static void qemu_macaddr_set_free(MACAddr *macaddr)
 158 {
 159     int index;
 160     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 161
 162     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 163         return;
 164     }
 165     for (index = 0x56; index < 0xFF; index++) {
 166         if (macaddr->a[5] == index) {
 167             mac_table[index]--;
 168         }
 169     }
 170 }
 171
 172 static int qemu_macaddr_get_free(void)
 173 {
 174     int index;
 175
 176     for (index = 0x56; index < 0xFF; index++) {
 177         if (mac_table[index] == 0) {
 178             return index;
 179         }
 180     }
 181
 182     return -1;
 183 }
 184
 185 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 186 {
 187     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 188     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 189
 190     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 191         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 192             return;
 193         } else {
 194             qemu_macaddr_set_used(macaddr);
 195             return;
 196         }
 197     }
 198
 199     macaddr->a[0] = 0x52;
 200     macaddr->a[1] = 0x54;
 201     macaddr->a[2] = 0x00;
 202     macaddr->a[3] = 0x12;
 203     macaddr->a[4] = 0x34;
 204     macaddr->a[5] = qemu_macaddr_get_free();
 205     qemu_macaddr_set_used(macaddr);
 206 }
 207
 208 /**
 209  * Generate a name for net client
 210  *
 211  * Only net clients created with the legacy -net option and NICs need this.
 212  */
 213 static char *assign_name(NetClientState *nc1, const char *model)
 214 {
 215     NetClientState *nc;
 216     int id = 0;
 217
 218     QTAILQ_FOREACH(nc, &net_clients, next) {
 219         if (nc == nc1) {
 220             continue;
 221         }
 222         if (strcmp(nc->model, model) == 0) {
 223             id++;
 224         }
 225     }
 226
 227     return g_strdup_printf("%s.%d", model, id);
 228 }
 229
 230 static void qemu_net_client_destructor(NetClientState *nc)
 231 {
 232     g_free(nc);
 233 }
 234
 235 static void qemu_net_client_setup(NetClientState *nc,
 236                                   NetClientInfo *info,
 237                                   NetClientState *peer,
 238                                   const char *model,
 239                                   const char *name,
 240                                   NetClientDestructor *destructor)
 241 {
 242     nc->info = info;
 243     nc->model = g_strdup(model);
 244     if (name) {
 245         nc->name = g_strdup(name);
 246     } else {
 247         nc->name = assign_name(nc, model);
 248     }
 249
 250     if (peer) {
 251         assert(!peer->peer);
 252         nc->peer = peer;
 253         peer->peer = nc;
 254     }
 255     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 256
 257     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 258     nc->destructor = destructor;
 259     QTAILQ_INIT(&nc->filters);
 260 }
 261
 262 NetClientState *qemu_new_net_client(NetClientInfo *info,
 263                                     NetClientState *peer,
 264                                     const char *model,
 265                                     const char *name)
 266 {
 267     NetClientState *nc;
 268
 269     assert(info->size >= sizeof(NetClientState));
 270
 271     nc = g_malloc0(info->size);
 272     qemu_net_client_setup(nc, info, peer, model, name,
 273                           qemu_net_client_destructor);
 274
 275     return nc;
 276 }
 277
 278 NICState *qemu_new_nic(NetClientInfo *info,
 279                        NICConf *conf,
 280                        const char *model,
 281                        const char *name,
 282                        void *opaque)
 283 {
 284     NetClientState **peers = conf->peers.ncs;
 285     NICState *nic;
 286     int i, queues = MAX(1, conf->peers.queues);
 287
 288     assert(info->type == NET_CLIENT_DRIVER_NIC);
 289     assert(info->size >= sizeof(NICState));
 290
 291     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 292     nic->ncs = (void *)nic + info->size;
 293     nic->conf = conf;
 294     nic->opaque = opaque;
 295
 296     for (i = 0; i < queues; i++) {
 297         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 298                               NULL);
 299         nic->ncs[i].queue_index = i;
 300     }
 301
 302     return nic;
 303 }
 304
 305 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 306 {
 307     return nic->ncs + queue_index;
 308 }
 309
 310 NetClientState *qemu_get_queue(NICState *nic)
 311 {
 312     return qemu_get_subqueue(nic, 0);
 313 }
 314
 315 NICState *qemu_get_nic(NetClientState *nc)
 316 {
 317     NetClientState *nc0 = nc - nc->queue_index;
 318
 319     return (NICState *)((void *)nc0 - nc->info->size);
 320 }
 321
 322 void *qemu_get_nic_opaque(NetClientState *nc)
 323 {
 324     NICState *nic = qemu_get_nic(nc);
 325
 326     return nic->opaque;
 327 }
 328
 329 static void qemu_cleanup_net_client(NetClientState *nc)
 330 {
 331     QTAILQ_REMOVE(&net_clients, nc, next);
 332
 333     if (nc->info->cleanup) {
 334         nc->info->cleanup(nc);
 335     }
 336 }
 337
 338 static void qemu_free_net_client(NetClientState *nc)
 339 {
 340     if (nc->incoming_queue) {
 341         qemu_del_net_queue(nc->incoming_queue);
 342     }
 343     if (nc->peer) {
 344         nc->peer->peer = NULL;
 345     }
 346     g_free(nc->name);
 347     g_free(nc->model);
 348     if (nc->destructor) {
 349         nc->destructor(nc);
 350     }
 351 }
 352
 353 void qemu_del_net_client(NetClientState *nc)
 354 {
 355     NetClientState *ncs[MAX_QUEUE_NUM];
 356     int queues, i;
 357     NetFilterState *nf, *next;
 358
 359     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 360
 361     /* If the NetClientState belongs to a multiqueue backend, we will change all
 362      * other NetClientStates also.
 363      */
 364     queues = qemu_find_net_clients_except(nc->name, ncs,
 365                                           NET_CLIENT_DRIVER_NIC,
 366                                           MAX_QUEUE_NUM);
 367     assert(queues != 0);
 368
 369     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 370         object_unparent(OBJECT(nf));
 371     }
 372
 373     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 374     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 375         NICState *nic = qemu_get_nic(nc->peer);
 376         if (nic->peer_deleted) {
 377             return;
 378         }
 379         nic->peer_deleted = true;
 380
 381         for (i = 0; i < queues; i++) {
 382             ncs[i]->peer->link_down = true;
 383         }
 384
 385         if (nc->peer->info->link_status_changed) {
 386             nc->peer->info->link_status_changed(nc->peer);
 387         }
 388
 389         for (i = 0; i < queues; i++) {
 390             qemu_cleanup_net_client(ncs[i]);
 391         }
 392
 393         return;
 394     }
 395
 396     for (i = 0; i < queues; i++) {
 397         qemu_cleanup_net_client(ncs[i]);
 398         qemu_free_net_client(ncs[i]);
 399     }
 400 }
 401
 402 void qemu_del_nic(NICState *nic)
 403 {
 404     int i, queues = MAX(nic->conf->peers.queues, 1);
 405
 406     qemu_macaddr_set_free(&nic->conf->macaddr);
 407
 408     /* If this is a peer NIC and peer has already been deleted, free it now. */
 409     if (nic->peer_deleted) {
 410         for (i = 0; i < queues; i++) {
 411             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 412         }
 413     }
 414
 415     for (i = queues - 1; i >= 0; i--) {
 416         NetClientState *nc = qemu_get_subqueue(nic, i);
 417
 418         qemu_cleanup_net_client(nc);
 419         qemu_free_net_client(nc);
 420     }
 421
 422     g_free(nic);
 423 }
 424
 425 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 426 {
 427     NetClientState *nc;
 428
 429     QTAILQ_FOREACH(nc, &net_clients, next) {
 430         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 431             if (nc->queue_index == 0) {
 432                 func(qemu_get_nic(nc), opaque);
 433             }
 434         }
 435     }
 436 }
 437
 438 bool qemu_has_ufo(NetClientState *nc)
 439 {
 440     if (!nc || !nc->info->has_ufo) {
 441         return false;
 442     }
 443
 444     return nc->info->has_ufo(nc);
 445 }
 446
 447 bool qemu_has_vnet_hdr(NetClientState *nc)
 448 {
 449     if (!nc || !nc->info->has_vnet_hdr) {
 450         return false;
 451     }
 452
 453     return nc->info->has_vnet_hdr(nc);
 454 }
 455
 456 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 457 {
 458     if (!nc || !nc->info->has_vnet_hdr_len) {
 459         return false;
 460     }
 461
 462     return nc->info->has_vnet_hdr_len(nc, len);
 463 }
 464
 465 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 466 {
 467     if (!nc || !nc->info->using_vnet_hdr) {
 468         return;
 469     }
 470
 471     nc->info->using_vnet_hdr(nc, enable);
 472 }
 473
 474 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 475                           int ecn, int ufo)
 476 {
 477     if (!nc || !nc->info->set_offload) {
 478         return;
 479     }
 480
 481     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 482 }
 483
 484 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 485 {
 486     if (!nc || !nc->info->set_vnet_hdr_len) {
 487         return;
 488     }
 489
 490     nc->vnet_hdr_len = len;
 491     nc->info->set_vnet_hdr_len(nc, len);
 492 }
 493
 494 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 495 {
 496 #ifdef HOST_WORDS_BIGENDIAN
 497     if (!nc || !nc->info->set_vnet_le) {
 498         return -ENOSYS;
 499     }
 500
 501     return nc->info->set_vnet_le(nc, is_le);
 502 #else
 503     return 0;
 504 #endif
 505 }
 506
 507 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 508 {
 509 #ifdef HOST_WORDS_BIGENDIAN
 510     return 0;
 511 #else
 512     if (!nc || !nc->info->set_vnet_be) {
 513         return -ENOSYS;
 514     }
 515
 516     return nc->info->set_vnet_be(nc, is_be);
 517 #endif
 518 }
 519
 520 int qemu_can_send_packet(NetClientState *sender)
 521 {
 522     int vm_running = runstate_is_running();
 523
 524     if (!vm_running) {
 525         return 0;
 526     }
 527
 528     if (!sender->peer) {
 529         return 1;
 530     }
 531
 532     if (sender->peer->receive_disabled) {
 533         return 0;
 534     } else if (sender->peer->info->can_receive &&
 535                !sender->peer->info->can_receive(sender->peer)) {
 536         return 0;
 537     }
 538     return 1;
 539 }
 540
 541 static ssize_t filter_receive_iov(NetClientState *nc,
 542                                   NetFilterDirection direction,
 543                                   NetClientState *sender,
 544                                   unsigned flags,
 545                                   const struct iovec *iov,
 546                                   int iovcnt,
 547                                   NetPacketSent *sent_cb)
 548 {
 549     ssize_t ret = 0;
 550     NetFilterState *nf = NULL;
 551
 552     if (direction == NET_FILTER_DIRECTION_TX) {
 553         QTAILQ_FOREACH(nf, &nc->filters, next) {
 554             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 555                                          iovcnt, sent_cb);
 556             if (ret) {
 557                 return ret;
 558             }
 559         }
 560     } else {
 561         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
 562             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 563                                          iovcnt, sent_cb);
 564             if (ret) {
 565                 return ret;
 566             }
 567         }
 568     }
 569
 570     return ret;
 571 }
 572
 573 static ssize_t filter_receive(NetClientState *nc,
 574                               NetFilterDirection direction,
 575                               NetClientState *sender,
 576                               unsigned flags,
 577                               const uint8_t *data,
 578                               size_t size,
 579                               NetPacketSent *sent_cb)
 580 {
 581     struct iovec iov = {
 582         .iov_base = (void *)data,
 583         .iov_len = size
 584     };
 585
 586     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 587 }
 588
 589 void qemu_purge_queued_packets(NetClientState *nc)
 590 {
 591     if (!nc->peer) {
 592         return;
 593     }
 594
 595     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 596 }
 597
 598 static
 599 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 600 {
 601     nc->receive_disabled = 0;
 602
 603     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 604         if (net_hub_flush(nc->peer)) {
 605             qemu_notify_event();
 606         }
 607     }
 608     if (qemu_net_queue_flush(nc->incoming_queue)) {
 609         /* We emptied the queue successfully, signal to the IO thread to repoll
 610          * the file descriptor (for tap, for example).
 611          */
 612         qemu_notify_event();
 613     } else if (purge) {
 614         /* Unable to empty the queue, purge remaining packets */
 615         qemu_net_queue_purge(nc->incoming_queue, nc);
 616     }
 617 }
 618
 619 void qemu_flush_queued_packets(NetClientState *nc)
 620 {
 621     qemu_flush_or_purge_queued_packets(nc, false);
 622 }
 623
 624 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 625                                                  unsigned flags,
 626                                                  const uint8_t *buf, int size,
 627                                                  NetPacketSent *sent_cb)
 628 {
 629     NetQueue *queue;
 630     int ret;
 631
 632 #ifdef DEBUG_NET
 633     printf("qemu_send_packet_async:\n");
 634     qemu_hexdump((const char *)buf, stdout, "net", size);
 635 #endif
 636
 637     if (sender->link_down || !sender->peer) {
 638         return size;
 639     }
 640
 641     /* Let filters handle the packet first */
 642     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 643                          sender, flags, buf, size, sent_cb);
 644     if (ret) {
 645         return ret;
 646     }
 647
 648     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 649                          sender, flags, buf, size, sent_cb);
 650     if (ret) {
 651         return ret;
 652     }
 653
 654     queue = sender->peer->incoming_queue;
 655
 656     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 657 }
 658
 659 ssize_t qemu_send_packet_async(NetClientState *sender,
 660                                const uint8_t *buf, int size,
 661                                NetPacketSent *sent_cb)
 662 {
 663     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 664                                              buf, size, sent_cb);
 665 }
 666
 667 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 668 {
 669     qemu_send_packet_async(nc, buf, size, NULL);
 670 }
 671
 672 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 673 {
 674     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 675                                              buf, size, NULL);
 676 }
 677
 678 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 679                                int iovcnt, unsigned flags)
 680 {
 681     uint8_t *buf = NULL;
 682     uint8_t *buffer;
 683     size_t offset;
 684     ssize_t ret;
 685
 686     if (iovcnt == 1) {
 687         buffer = iov[0].iov_base;
 688         offset = iov[0].iov_len;
 689     } else {
 690         offset = iov_size(iov, iovcnt);
 691         if (offset > NET_BUFSIZE) {
 692             return -1;
 693         }
 694         buf = g_malloc(offset);
 695         buffer = buf;
 696         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 697     }
 698
 699     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 700         ret = nc->info->receive_raw(nc, buffer, offset);
 701     } else {
 702         ret = nc->info->receive(nc, buffer, offset);
 703     }
 704
 705     g_free(buf);
 706     return ret;
 707 }
 708
 709 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 710                                 unsigned flags,
 711                                 const struct iovec *iov,
 712                                 int iovcnt,
 713                                 void *opaque)
 714 {
 715     NetClientState *nc = opaque;
 716     int ret;
 717
 718     if (nc->link_down) {
 719         return iov_size(iov, iovcnt);
 720     }
 721
 722     if (nc->receive_disabled) {
 723         return 0;
 724     }
 725
 726     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 727         ret = nc->info->receive_iov(nc, iov, iovcnt);
 728     } else {
 729         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 730     }
 731
 732     if (ret == 0) {
 733         nc->receive_disabled = 1;
 734     }
 735
 736     return ret;
 737 }
 738
 739 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 740                                 const struct iovec *iov, int iovcnt,
 741                                 NetPacketSent *sent_cb)
 742 {
 743     NetQueue *queue;
 744     int ret;
 745
 746     if (sender->link_down || !sender->peer) {
 747         return iov_size(iov, iovcnt);
 748     }
 749
 750     /* Let filters handle the packet first */
 751     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 752                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 753     if (ret) {
 754         return ret;
 755     }
 756
 757     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 758                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 759     if (ret) {
 760         return ret;
 761     }
 762
 763     queue = sender->peer->incoming_queue;
 764
 765     return qemu_net_queue_send_iov(queue, sender,
 766                                    QEMU_NET_PACKET_FLAG_NONE,
 767                                    iov, iovcnt, sent_cb);
 768 }
 769
 770 ssize_t
 771 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 772 {
 773     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 774 }
 775
 776 NetClientState *qemu_find_netdev(const char *id)
 777 {
 778     NetClientState *nc;
 779
 780     QTAILQ_FOREACH(nc, &net_clients, next) {
 781         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 782             continue;
 783         if (!strcmp(nc->name, id)) {
 784             return nc;
 785         }
 786     }
 787
 788     return NULL;
 789 }
 790
 791 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 792                                  NetClientDriver type, int max)
 793 {
 794     NetClientState *nc;
 795     int ret = 0;
 796
 797     QTAILQ_FOREACH(nc, &net_clients, next) {
 798         if (nc->info->type == type) {
 799             continue;
 800         }
 801         if (!id || !strcmp(nc->name, id)) {
 802             if (ret < max) {
 803                 ncs[ret] = nc;
 804             }
 805             ret++;
 806         }
 807     }
 808
 809     return ret;
 810 }
 811
 812 static int nic_get_free_idx(void)
 813 {
 814     int index;
 815
 816     for (index = 0; index < MAX_NICS; index++)
 817         if (!nd_table[index].used)
 818             return index;
 819     return -1;
 820 }
 821
 822 int qemu_show_nic_models(const char *arg, const char *const *models)
 823 {
 824     int i;
 825
 826     if (!arg || !is_help_option(arg)) {
 827         return 0;
 828     }
 829
 830     fprintf(stderr, "qemu: Supported NIC models: ");
 831     for (i = 0 ; models[i]; i++)
 832         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 833     return 1;
 834 }
 835
 836 void qemu_check_nic_model(NICInfo *nd, const char *model)
 837 {
 838     const char *models[2];
 839
 840     models[0] = model;
 841     models[1] = NULL;
 842
 843     if (qemu_show_nic_models(nd->model, models))
 844         exit(0);
 845     if (qemu_find_nic_model(nd, models, model) < 0)
 846         exit(1);
 847 }
 848
 849 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 850                         const char *default_model)
 851 {
 852     int i;
 853
 854     if (!nd->model)
 855         nd->model = g_strdup(default_model);
 856
 857     for (i = 0 ; models[i]; i++) {
 858         if (strcmp(nd->model, models[i]) == 0)
 859             return i;
 860     }
 861
 862     error_report("Unsupported NIC model: %s", nd->model);
 863     return -1;
 864 }
 865
 866 static int net_init_nic(const Netdev *netdev, const char *name,
 867                         NetClientState *peer, Error **errp)
 868 {
 869     int idx;
 870     NICInfo *nd;
 871     const NetLegacyNicOptions *nic;
 872
 873     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 874     nic = &netdev->u.nic;
 875
 876     idx = nic_get_free_idx();
 877     if (idx == -1 || nb_nics >= MAX_NICS) {
 878         error_setg(errp, "too many NICs");
 879         return -1;
 880     }
 881
 882     nd = &nd_table[idx];
 883
 884     memset(nd, 0, sizeof(*nd));
 885
 886     if (nic->has_netdev) {
 887         nd->netdev = qemu_find_netdev(nic->netdev);
 888         if (!nd->netdev) {
 889             error_setg(errp, "netdev '%s' not found", nic->netdev);
 890             return -1;
 891         }
 892     } else {
 893         assert(peer);
 894         nd->netdev = peer;
 895     }
 896     nd->name = g_strdup(name);
 897     if (nic->has_model) {
 898         nd->model = g_strdup(nic->model);
 899     }
 900     if (nic->has_addr) {
 901         nd->devaddr = g_strdup(nic->addr);
 902     }
 903
 904     if (nic->has_macaddr &&
 905         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 906         error_setg(errp, "invalid syntax for ethernet address");
 907         return -1;
 908     }
 909     if (nic->has_macaddr &&
 910         is_multicast_ether_addr(nd->macaddr.a)) {
 911         error_setg(errp,
 912                    "NIC cannot have multicast MAC address (odd 1st byte)");
 913         return -1;
 914     }
 915     qemu_macaddr_default_if_unset(&nd->macaddr);
 916
 917     if (nic->has_vectors) {
 918         if (nic->vectors > 0x7ffffff) {
 919             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 920             return -1;
 921         }
 922         nd->nvectors = nic->vectors;
 923     } else {
 924         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 925     }
 926
 927     nd->used = 1;
 928     nb_nics++;
 929
 930     return idx;
 931 }
 932
 933
 934 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 935     const Netdev *netdev,
 936     const char *name,
 937     NetClientState *peer, Error **errp) = {
 938         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 939 #ifdef CONFIG_SLIRP
 940         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 941 #endif
 942         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 943         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 944 #ifdef CONFIG_VDE
 945         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 946 #endif
 947 #ifdef CONFIG_NETMAP
 948         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 949 #endif
 950 #ifdef CONFIG_NET_BRIDGE
 951         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 952 #endif
 953         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 954 #ifdef CONFIG_VHOST_NET_USED
 955         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 956 #endif
 957 #ifdef CONFIG_L2TPV3
 958         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 959 #endif
 960 };
 961
 962
 963 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 964 {
 965     Netdev legacy = {0};
 966     const Netdev *netdev;
 967     const char *name;
 968     NetClientState *peer = NULL;
 969     static bool vlan_warned;
 970
 971     if (is_netdev) {
 972         netdev = object;
 973         name = netdev->id;
 974
 975         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 976             !net_client_init_fun[netdev->type]) {
 977             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 978                        "a netdev backend type");
 979             return -1;
 980         }
 981     } else {
 982         const NetLegacy *net = object;
 983         const NetLegacyOptions *opts = net->opts;
 984         legacy.id = net->id;
 985         netdev = &legacy;
 986         /* missing optional values have been initialized to "all bits zero" */
 987         name = net->has_id ? net->id : net->name;
 988
 989         /* Map the old options to the new flat type */
 990         switch (opts->type) {
 991         case NET_LEGACY_OPTIONS_TYPE_NONE:
 992             return 0; /* nothing to do */
 993         case NET_LEGACY_OPTIONS_TYPE_NIC:
 994             legacy.type = NET_CLIENT_DRIVER_NIC;
 995             legacy.u.nic = opts->u.nic;
 996             break;
 997         case NET_LEGACY_OPTIONS_TYPE_USER:
 998             legacy.type = NET_CLIENT_DRIVER_USER;
 999             legacy.u.user = opts->u.user;
1000             break;
1001         case NET_LEGACY_OPTIONS_TYPE_TAP:
1002             legacy.type = NET_CLIENT_DRIVER_TAP;
1003             legacy.u.tap = opts->u.tap;
1004             break;
1005         case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1006             legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1007             legacy.u.l2tpv3 = opts->u.l2tpv3;
1008             break;
1009         case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1010             legacy.type = NET_CLIENT_DRIVER_SOCKET;
1011             legacy.u.socket = opts->u.socket;
1012             break;
1013         case NET_LEGACY_OPTIONS_TYPE_VDE:
1014             legacy.type = NET_CLIENT_DRIVER_VDE;
1015             legacy.u.vde = opts->u.vde;
1016             break;
1017         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1018             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1019             legacy.u.bridge = opts->u.bridge;
1020             break;
1021         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1022             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1023             legacy.u.netmap = opts->u.netmap;
1024             break;
1025         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1026             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1027             legacy.u.vhost_user = opts->u.vhost_user;
1028             break;
1029         default:
1030             abort();
1031         }
1032
1033         if (!net_client_init_fun[netdev->type]) {
1034             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1035                        "a net backend type (maybe it is not compiled "
1036                        "into this binary)");
1037             return -1;
1038         }
1039
1040         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1041         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1042             !opts->u.nic.has_netdev) {
1043             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL, NULL);
1044         }
1045
1046         if (net->has_vlan && !vlan_warned) {
1047             error_report("'vlan' is deprecated. Please use 'netdev' instead.");
1048             vlan_warned = true;
1049         }
1050     }
1051
1052     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1053         /* FIXME drop when all init functions store an Error */
1054         if (errp && !*errp) {
1055             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1056                        NetClientDriver_str(netdev->type));
1057         }
1058         return -1;
1059     }
1060     return 0;
1061 }
1062
1063 static void show_netdevs(void)
1064 {
1065     int idx;
1066     const char *available_netdevs[] = {
1067         "socket",
1068         "hubport",
1069         "tap",
1070 #ifdef CONFIG_SLIRP
1071         "user",
1072 #endif
1073 #ifdef CONFIG_L2TPV3
1074         "l2tpv3",
1075 #endif
1076 #ifdef CONFIG_VDE
1077         "vde",
1078 #endif
1079 #ifdef CONFIG_NET_BRIDGE
1080         "bridge",
1081 #endif
1082 #ifdef CONFIG_NETMAP
1083         "netmap",
1084 #endif
1085 #ifdef CONFIG_POSIX
1086         "vhost-user",
1087 #endif
1088     };
1089
1090     printf("Available netdev backend types:\n");
1091     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1092         puts(available_netdevs[idx]);
1093     }
1094 }
1095
1096 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1097 {
1098     void *object = NULL;
1099     Error *err = NULL;
1100     int ret = -1;
1101     Visitor *v = opts_visitor_new(opts);
1102
1103     if (is_netdev && is_help_option(qemu_opt_get(opts, "type"))) {
1104         show_netdevs();
1105         exit(0);
1106     } else {
1107         /* Parse convenience option format ip6-net=fec0::0[/64] */
1108         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1109
1110         if (ip6_net) {
1111             char buf[strlen(ip6_net) + 1];
1112
1113             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1114                 /* Default 64bit prefix length.  */
1115                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1116                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1117             } else {
1118                 /* User-specified prefix length.  */
1119                 unsigned long len;
1120                 int err;
1121
1122                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1123                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1124
1125                 if (err) {
1126                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1127                               "ipv6-prefix", "a number");
1128                 } else {
1129                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1130                                         &error_abort);
1131                 }
1132             }
1133             qemu_opt_unset(opts, "ipv6-net");
1134         }
1135     }
1136
1137     if (is_netdev) {
1138         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1139     } else {
1140         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1141     }
1142
1143     if (!err) {
1144         ret = net_client_init1(object, is_netdev, &err);
1145     }
1146
1147     if (is_netdev) {
1148         qapi_free_Netdev(object);
1149     } else {
1150         qapi_free_NetLegacy(object);
1151     }
1152
1153     error_propagate(errp, err);
1154     visit_free(v);
1155     return ret;
1156 }
1157
1158 void netdev_add(QemuOpts *opts, Error **errp)
1159 {
1160     net_client_init(opts, true, errp);
1161 }
1162
1163 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1164 {
1165     Error *local_err = NULL;
1166     QemuOptsList *opts_list;
1167     QemuOpts *opts;
1168
1169     opts_list = qemu_find_opts_err("netdev", &local_err);
1170     if (local_err) {
1171         goto out;
1172     }
1173
1174     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1175     if (local_err) {
1176         goto out;
1177     }
1178
1179     netdev_add(opts, &local_err);
1180     if (local_err) {
1181         qemu_opts_del(opts);
1182         goto out;
1183     }
1184
1185 out:
1186     error_propagate(errp, local_err);
1187 }
1188
1189 void qmp_netdev_del(const char *id, Error **errp)
1190 {
1191     NetClientState *nc;
1192     QemuOpts *opts;
1193
1194     nc = qemu_find_netdev(id);
1195     if (!nc) {
1196         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1197                   "Device '%s' not found", id);
1198         return;
1199     }
1200
1201     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1202     if (!opts) {
1203         error_setg(errp, "Device '%s' is not a netdev", id);
1204         return;
1205     }
1206
1207     qemu_del_net_client(nc);
1208     qemu_opts_del(opts);
1209 }
1210
1211 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1212 {
1213     char *str;
1214     ObjectProperty *prop;
1215     ObjectPropertyIterator iter;
1216     Visitor *v;
1217
1218     /* generate info str */
1219     object_property_iter_init(&iter, OBJECT(nf));
1220     while ((prop = object_property_iter_next(&iter))) {
1221         if (!strcmp(prop->name, "type")) {
1222             continue;
1223         }
1224         v = string_output_visitor_new(false, &str);
1225         object_property_get(OBJECT(nf), v, prop->name, NULL);
1226         visit_complete(v, &str);
1227         visit_free(v);
1228         monitor_printf(mon, ",%s=%s", prop->name, str);
1229         g_free(str);
1230     }
1231     monitor_printf(mon, "\n");
1232 }
1233
1234 void print_net_client(Monitor *mon, NetClientState *nc)
1235 {
1236     NetFilterState *nf;
1237
1238     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1239                    nc->queue_index,
1240                    NetClientDriver_str(nc->info->type),
1241                    nc->info_str);
1242     if (!QTAILQ_EMPTY(&nc->filters)) {
1243         monitor_printf(mon, "filters:\n");
1244     }
1245     QTAILQ_FOREACH(nf, &nc->filters, next) {
1246         char *path = object_get_canonical_path_component(OBJECT(nf));
1247
1248         monitor_printf(mon, "  - %s: type=%s", path,
1249                        object_get_typename(OBJECT(nf)));
1250         netfilter_print_info(mon, nf);
1251         g_free(path);
1252     }
1253 }
1254
1255 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1256                                       Error **errp)
1257 {
1258     NetClientState *nc;
1259     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1260
1261     QTAILQ_FOREACH(nc, &net_clients, next) {
1262         RxFilterInfoList *entry;
1263         RxFilterInfo *info;
1264
1265         if (has_name && strcmp(nc->name, name) != 0) {
1266             continue;
1267         }
1268
1269         /* only query rx-filter information of NIC */
1270         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1271             if (has_name) {
1272                 error_setg(errp, "net client(%s) isn't a NIC", name);
1273                 return NULL;
1274             }
1275             continue;
1276         }
1277
1278         /* only query information on queue 0 since the info is per nic,
1279          * not per queue
1280          */
1281         if (nc->queue_index != 0)
1282             continue;
1283
1284         if (nc->info->query_rx_filter) {
1285             info = nc->info->query_rx_filter(nc);
1286             entry = g_malloc0(sizeof(*entry));
1287             entry->value = info;
1288
1289             if (!filter_list) {
1290                 filter_list = entry;
1291             } else {
1292                 last_entry->next = entry;
1293             }
1294             last_entry = entry;
1295         } else if (has_name) {
1296             error_setg(errp, "net client(%s) doesn't support"
1297                        " rx-filter querying", name);
1298             return NULL;
1299         }
1300
1301         if (has_name) {
1302             break;
1303         }
1304     }
1305
1306     if (filter_list == NULL && has_name) {
1307         error_setg(errp, "invalid net client name: %s", name);
1308     }
1309
1310     return filter_list;
1311 }
1312
1313 void hmp_info_network(Monitor *mon, const QDict *qdict)
1314 {
1315     NetClientState *nc, *peer;
1316     NetClientDriver type;
1317
1318     net_hub_info(mon);
1319
1320     QTAILQ_FOREACH(nc, &net_clients, next) {
1321         peer = nc->peer;
1322         type = nc->info->type;
1323
1324         /* Skip if already printed in hub info */
1325         if (net_hub_id_for_client(nc, NULL) == 0) {
1326             continue;
1327         }
1328
1329         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1330             print_net_client(mon, nc);
1331         } /* else it's a netdev connected to a NIC, printed with the NIC */
1332         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1333             monitor_printf(mon, " \\ ");
1334             print_net_client(mon, peer);
1335         }
1336     }
1337 }
1338
1339 void qmp_set_link(const char *name, bool up, Error **errp)
1340 {
1341     NetClientState *ncs[MAX_QUEUE_NUM];
1342     NetClientState *nc;
1343     int queues, i;
1344
1345     queues = qemu_find_net_clients_except(name, ncs,
1346                                           NET_CLIENT_DRIVER__MAX,
1347                                           MAX_QUEUE_NUM);
1348
1349     if (queues == 0) {
1350         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1351                   "Device '%s' not found", name);
1352         return;
1353     }
1354     nc = ncs[0];
1355
1356     for (i = 0; i < queues; i++) {
1357         ncs[i]->link_down = !up;
1358     }
1359
1360     if (nc->info->link_status_changed) {
1361         nc->info->link_status_changed(nc);
1362     }
1363
1364     if (nc->peer) {
1365         /* Change peer link only if the peer is NIC and then notify peer.
1366          * If the peer is a HUBPORT or a backend, we do not change the
1367          * link status.
1368          *
1369          * This behavior is compatible with qemu vlans where there could be
1370          * multiple clients that can still communicate with each other in
1371          * disconnected mode. For now maintain this compatibility.
1372          */
1373         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1374             for (i = 0; i < queues; i++) {
1375                 ncs[i]->peer->link_down = !up;
1376             }
1377         }
1378         if (nc->peer->info->link_status_changed) {
1379             nc->peer->info->link_status_changed(nc->peer);
1380         }
1381     }
1382 }
1383
1384 static void net_vm_change_state_handler(void *opaque, int running,
1385                                         RunState state)
1386 {
1387     NetClientState *nc;
1388     NetClientState *tmp;
1389
1390     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1391         if (running) {
1392             /* Flush queued packets and wake up backends. */
1393             if (nc->peer && qemu_can_send_packet(nc)) {
1394                 qemu_flush_queued_packets(nc->peer);
1395             }
1396         } else {
1397             /* Complete all queued packets, to guarantee we don't modify
1398              * state later when VM is not running.
1399              */
1400             qemu_flush_or_purge_queued_packets(nc, true);
1401         }
1402     }
1403 }
1404
1405 void net_cleanup(void)
1406 {
1407     NetClientState *nc;
1408
1409     /* We may del multiple entries during qemu_del_net_client(),
1410      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1411      */
1412     while (!QTAILQ_EMPTY(&net_clients)) {
1413         nc = QTAILQ_FIRST(&net_clients);
1414         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1415             qemu_del_nic(qemu_get_nic(nc));
1416         } else {
1417             qemu_del_net_client(nc);
1418         }
1419     }
1420
1421     qemu_del_vm_change_state_handler(net_change_state_entry);
1422 }
1423
1424 void net_check_clients(void)
1425 {
1426     NetClientState *nc;
1427     int i;
1428
1429     net_hub_check_clients();
1430
1431     QTAILQ_FOREACH(nc, &net_clients, next) {
1432         if (!nc->peer) {
1433             warn_report("%s %s has no peer",
1434                         nc->info->type == NET_CLIENT_DRIVER_NIC
1435                         ? "nic" : "netdev",
1436                         nc->name);
1437         }
1438     }
1439
1440     /* Check that all NICs requested via -net nic actually got created.
1441      * NICs created via -device don't need to be checked here because
1442      * they are always instantiated.
1443      */
1444     for (i = 0; i < MAX_NICS; i++) {
1445         NICInfo *nd = &nd_table[i];
1446         if (nd->used && !nd->instantiated) {
1447             warn_report("requested NIC (%s, model %s) "
1448                         "was not created (not supported by this machine?)",
1449                         nd->name ? nd->name : "anonymous",
1450                         nd->model ? nd->model : "unspecified");
1451         }
1452     }
1453 }
1454
1455 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1456 {
1457     return net_client_init(opts, false, errp);
1458 }
1459
1460 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1461 {
1462     return net_client_init(opts, true, errp);
1463 }
1464
1465 int net_init_clients(Error **errp)
1466 {
1467     net_change_state_entry =
1468         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1469
1470     QTAILQ_INIT(&net_clients);
1471
1472     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1473                           net_init_netdev, NULL, errp)) {
1474         return -1;
1475     }
1476
1477     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1478         return -1;
1479     }
1480
1481     return 0;
1482 }
1483
1484 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1485 {
1486     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1487         return -1;
1488     }
1489
1490     return 0;
1491 }
1492
1493 /* From FreeBSD */
1494 /* XXX: optimize */
1495 uint32_t net_crc32(const uint8_t *p, int len)
1496 {
1497     uint32_t crc;
1498     int carry, i, j;
1499     uint8_t b;
1500
1501     crc = 0xffffffff;
1502     for (i = 0; i < len; i++) {
1503         b = *p++;
1504         for (j = 0; j < 8; j++) {
1505             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1506             crc <<= 1;
1507             b >>= 1;
1508             if (carry) {
1509                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1510             }
1511         }
1512     }
1513
1514     return crc;
1515 }
1516
1517 uint32_t net_crc32_le(const uint8_t *p, int len)
1518 {
1519     uint32_t crc;
1520     int carry, i, j;
1521     uint8_t b;
1522
1523     crc = 0xffffffff;
1524     for (i = 0; i < len; i++) {
1525         b = *p++;
1526         for (j = 0; j < 8; j++) {
1527             carry = (crc & 0x1) ^ (b & 0x01);
1528             crc >>= 1;
1529             b >>= 1;
1530             if (carry) {
1531                 crc ^= POLYNOMIAL_LE;
1532             }
1533         }
1534     }
1535
1536     return crc;
1537 }
1538
1539 QemuOptsList qemu_netdev_opts = {
1540     .name = "netdev",
1541     .implied_opt_name = "type",
1542     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1543     .desc = {
1544         /*
1545          * no elements => accept any params
1546          * validation will happen later
1547          */
1548         { /* end of list */ }
1549     },
1550 };
1551
1552 QemuOptsList qemu_net_opts = {
1553     .name = "net",
1554     .implied_opt_name = "type",
1555     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1556     .desc = {
1557         /*
1558          * no elements => accept any params
1559          * validation will happen later
1560          */
1561         { /* end of list */ }
1562     },
1563 };
1564
1565 void net_socket_rs_init(SocketReadState *rs,
1566                         SocketReadStateFinalize *finalize,
1567                         bool vnet_hdr)
1568 {
1569     rs->state = 0;
1570     rs->vnet_hdr = vnet_hdr;
1571     rs->index = 0;
1572     rs->packet_len = 0;
1573     rs->vnet_hdr_len = 0;
1574     memset(rs->buf, 0, sizeof(rs->buf));
1575     rs->finalize = finalize;
1576 }
1577
1578 /*
1579  * Returns
1580  * 0: success
1581  * -1: error occurs
1582  */
1583 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1584 {
1585     unsigned int l;
1586
1587     while (size > 0) {
1588         /* Reassemble a packet from the network.
1589          * 0 = getting length.
1590          * 1 = getting vnet header length.
1591          * 2 = getting data.
1592          */
1593         switch (rs->state) {
1594         case 0:
1595             l = 4 - rs->index;
1596             if (l > size) {
1597                 l = size;
1598             }
1599             memcpy(rs->buf + rs->index, buf, l);
1600             buf += l;
1601             size -= l;
1602             rs->index += l;
1603             if (rs->index == 4) {
1604                 /* got length */
1605                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1606                 rs->index = 0;
1607                 if (rs->vnet_hdr) {
1608                     rs->state = 1;
1609                 } else {
1610                     rs->state = 2;
1611                     rs->vnet_hdr_len = 0;
1612                 }
1613             }
1614             break;
1615         case 1:
1616             l = 4 - rs->index;
1617             if (l > size) {
1618                 l = size;
1619             }
1620             memcpy(rs->buf + rs->index, buf, l);
1621             buf += l;
1622             size -= l;
1623             rs->index += l;
1624             if (rs->index == 4) {
1625                 /* got vnet header length */
1626                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1627                 rs->index = 0;
1628                 rs->state = 2;
1629             }
1630             break;
1631         case 2:
1632             l = rs->packet_len - rs->index;
1633             if (l > size) {
1634                 l = size;
1635             }
1636             if (rs->index + l <= sizeof(rs->buf)) {
1637                 memcpy(rs->buf + rs->index, buf, l);
1638             } else {
1639                 fprintf(stderr, "serious error: oversized packet received,"
1640                     "connection terminated.\n");
1641                 rs->index = rs->state = 0;
1642                 return -1;
1643             }
1644
1645             rs->index += l;
1646             buf += l;
1647             size -= l;
1648             if (rs->index >= rs->packet_len) {
1649                 rs->index = 0;
1650                 rs->state = 0;
1651                 assert(rs->finalize);
1652                 rs->finalize(rs);
1653             }
1654             break;
1655         }
1656     }
1657
1658     assert(size == 0);
1659     return 0;
1660 }