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/qapi-commands-net.h"
  37 #include "qapi/qapi-visit-net.h"
  38 #include "qapi/qmp/qdict.h"
  39 #include "qapi/qmp/qerror.h"
  40 #include "qemu/error-report.h"
  41 #include "qemu/sockets.h"
  42 #include "qemu/cutils.h"
  43 #include "qemu/config-file.h"
  44 #include "hw/qdev.h"
  45 #include "qemu/iov.h"
  46 #include "qemu/main-loop.h"
  47 #include "qemu/option.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 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 599 {
 600     nc->receive_disabled = 0;
 601
 602     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 603         if (net_hub_flush(nc->peer)) {
 604             qemu_notify_event();
 605         }
 606     }
 607     if (qemu_net_queue_flush(nc->incoming_queue)) {
 608         /* We emptied the queue successfully, signal to the IO thread to repoll
 609          * the file descriptor (for tap, for example).
 610          */
 611         qemu_notify_event();
 612     } else if (purge) {
 613         /* Unable to empty the queue, purge remaining packets */
 614         qemu_net_queue_purge(nc->incoming_queue, nc);
 615     }
 616 }
 617
 618 void qemu_flush_queued_packets(NetClientState *nc)
 619 {
 620     qemu_flush_or_purge_queued_packets(nc, false);
 621 }
 622
 623 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 624                                                  unsigned flags,
 625                                                  const uint8_t *buf, int size,
 626                                                  NetPacketSent *sent_cb)
 627 {
 628     NetQueue *queue;
 629     int ret;
 630
 631 #ifdef DEBUG_NET
 632     printf("qemu_send_packet_async:\n");
 633     qemu_hexdump((const char *)buf, stdout, "net", size);
 634 #endif
 635
 636     if (sender->link_down || !sender->peer) {
 637         return size;
 638     }
 639
 640     /* Let filters handle the packet first */
 641     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 642                          sender, flags, buf, size, sent_cb);
 643     if (ret) {
 644         return ret;
 645     }
 646
 647     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 648                          sender, flags, buf, size, sent_cb);
 649     if (ret) {
 650         return ret;
 651     }
 652
 653     queue = sender->peer->incoming_queue;
 654
 655     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 656 }
 657
 658 ssize_t qemu_send_packet_async(NetClientState *sender,
 659                                const uint8_t *buf, int size,
 660                                NetPacketSent *sent_cb)
 661 {
 662     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 663                                              buf, size, sent_cb);
 664 }
 665
 666 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 667 {
 668     qemu_send_packet_async(nc, buf, size, NULL);
 669 }
 670
 671 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 672 {
 673     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 674                                              buf, size, NULL);
 675 }
 676
 677 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 678                                int iovcnt, unsigned flags)
 679 {
 680     uint8_t *buf = NULL;
 681     uint8_t *buffer;
 682     size_t offset;
 683     ssize_t ret;
 684
 685     if (iovcnt == 1) {
 686         buffer = iov[0].iov_base;
 687         offset = iov[0].iov_len;
 688     } else {
 689         offset = iov_size(iov, iovcnt);
 690         if (offset > NET_BUFSIZE) {
 691             return -1;
 692         }
 693         buf = g_malloc(offset);
 694         buffer = buf;
 695         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 696     }
 697
 698     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 699         ret = nc->info->receive_raw(nc, buffer, offset);
 700     } else {
 701         ret = nc->info->receive(nc, buffer, offset);
 702     }
 703
 704     g_free(buf);
 705     return ret;
 706 }
 707
 708 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 709                                 unsigned flags,
 710                                 const struct iovec *iov,
 711                                 int iovcnt,
 712                                 void *opaque)
 713 {
 714     NetClientState *nc = opaque;
 715     int ret;
 716
 717     if (nc->link_down) {
 718         return iov_size(iov, iovcnt);
 719     }
 720
 721     if (nc->receive_disabled) {
 722         return 0;
 723     }
 724
 725     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 726         ret = nc->info->receive_iov(nc, iov, iovcnt);
 727     } else {
 728         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 729     }
 730
 731     if (ret == 0) {
 732         nc->receive_disabled = 1;
 733     }
 734
 735     return ret;
 736 }
 737
 738 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 739                                 const struct iovec *iov, int iovcnt,
 740                                 NetPacketSent *sent_cb)
 741 {
 742     NetQueue *queue;
 743     int ret;
 744
 745     if (sender->link_down || !sender->peer) {
 746         return iov_size(iov, iovcnt);
 747     }
 748
 749     /* Let filters handle the packet first */
 750     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 751                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 752     if (ret) {
 753         return ret;
 754     }
 755
 756     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 757                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 758     if (ret) {
 759         return ret;
 760     }
 761
 762     queue = sender->peer->incoming_queue;
 763
 764     return qemu_net_queue_send_iov(queue, sender,
 765                                    QEMU_NET_PACKET_FLAG_NONE,
 766                                    iov, iovcnt, sent_cb);
 767 }
 768
 769 ssize_t
 770 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 771 {
 772     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 773 }
 774
 775 NetClientState *qemu_find_netdev(const char *id)
 776 {
 777     NetClientState *nc;
 778
 779     QTAILQ_FOREACH(nc, &net_clients, next) {
 780         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 781             continue;
 782         if (!strcmp(nc->name, id)) {
 783             return nc;
 784         }
 785     }
 786
 787     return NULL;
 788 }
 789
 790 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 791                                  NetClientDriver type, int max)
 792 {
 793     NetClientState *nc;
 794     int ret = 0;
 795
 796     QTAILQ_FOREACH(nc, &net_clients, next) {
 797         if (nc->info->type == type) {
 798             continue;
 799         }
 800         if (!id || !strcmp(nc->name, id)) {
 801             if (ret < max) {
 802                 ncs[ret] = nc;
 803             }
 804             ret++;
 805         }
 806     }
 807
 808     return ret;
 809 }
 810
 811 static int nic_get_free_idx(void)
 812 {
 813     int index;
 814
 815     for (index = 0; index < MAX_NICS; index++)
 816         if (!nd_table[index].used)
 817             return index;
 818     return -1;
 819 }
 820
 821 int qemu_show_nic_models(const char *arg, const char *const *models)
 822 {
 823     int i;
 824
 825     if (!arg || !is_help_option(arg)) {
 826         return 0;
 827     }
 828
 829     fprintf(stderr, "qemu: Supported NIC models: ");
 830     for (i = 0 ; models[i]; i++)
 831         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 832     return 1;
 833 }
 834
 835 void qemu_check_nic_model(NICInfo *nd, const char *model)
 836 {
 837     const char *models[2];
 838
 839     models[0] = model;
 840     models[1] = NULL;
 841
 842     if (qemu_show_nic_models(nd->model, models))
 843         exit(0);
 844     if (qemu_find_nic_model(nd, models, model) < 0)
 845         exit(1);
 846 }
 847
 848 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 849                         const char *default_model)
 850 {
 851     int i;
 852
 853     if (!nd->model)
 854         nd->model = g_strdup(default_model);
 855
 856     for (i = 0 ; models[i]; i++) {
 857         if (strcmp(nd->model, models[i]) == 0)
 858             return i;
 859     }
 860
 861     error_report("Unsupported NIC model: %s", nd->model);
 862     return -1;
 863 }
 864
 865 static int net_init_nic(const Netdev *netdev, const char *name,
 866                         NetClientState *peer, Error **errp)
 867 {
 868     int idx;
 869     NICInfo *nd;
 870     const NetLegacyNicOptions *nic;
 871
 872     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 873     nic = &netdev->u.nic;
 874
 875     idx = nic_get_free_idx();
 876     if (idx == -1 || nb_nics >= MAX_NICS) {
 877         error_setg(errp, "too many NICs");
 878         return -1;
 879     }
 880
 881     nd = &nd_table[idx];
 882
 883     memset(nd, 0, sizeof(*nd));
 884
 885     if (nic->has_netdev) {
 886         nd->netdev = qemu_find_netdev(nic->netdev);
 887         if (!nd->netdev) {
 888             error_setg(errp, "netdev '%s' not found", nic->netdev);
 889             return -1;
 890         }
 891     } else {
 892         assert(peer);
 893         nd->netdev = peer;
 894     }
 895     nd->name = g_strdup(name);
 896     if (nic->has_model) {
 897         nd->model = g_strdup(nic->model);
 898     }
 899     if (nic->has_addr) {
 900         nd->devaddr = g_strdup(nic->addr);
 901     }
 902
 903     if (nic->has_macaddr &&
 904         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 905         error_setg(errp, "invalid syntax for ethernet address");
 906         return -1;
 907     }
 908     if (nic->has_macaddr &&
 909         is_multicast_ether_addr(nd->macaddr.a)) {
 910         error_setg(errp,
 911                    "NIC cannot have multicast MAC address (odd 1st byte)");
 912         return -1;
 913     }
 914     qemu_macaddr_default_if_unset(&nd->macaddr);
 915
 916     if (nic->has_vectors) {
 917         if (nic->vectors > 0x7ffffff) {
 918             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 919             return -1;
 920         }
 921         nd->nvectors = nic->vectors;
 922     } else {
 923         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 924     }
 925
 926     nd->used = 1;
 927     nb_nics++;
 928
 929     return idx;
 930 }
 931
 932
 933 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 934     const Netdev *netdev,
 935     const char *name,
 936     NetClientState *peer, Error **errp) = {
 937         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 938 #ifdef CONFIG_SLIRP
 939         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 940 #endif
 941         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 942         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 943 #ifdef CONFIG_VDE
 944         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 945 #endif
 946 #ifdef CONFIG_NETMAP
 947         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 948 #endif
 949 #ifdef CONFIG_NET_BRIDGE
 950         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 951 #endif
 952         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 953 #ifdef CONFIG_VHOST_NET_USED
 954         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 955 #endif
 956 #ifdef CONFIG_L2TPV3
 957         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 958 #endif
 959 };
 960
 961
 962 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 963 {
 964     Netdev legacy = {0};
 965     const Netdev *netdev;
 966     const char *name;
 967     NetClientState *peer = NULL;
 968
 969     if (is_netdev) {
 970         netdev = object;
 971         name = netdev->id;
 972
 973         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 974             !net_client_init_fun[netdev->type]) {
 975             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 976                        "a netdev backend type");
 977             return -1;
 978         }
 979     } else {
 980         const NetLegacy *net = object;
 981         const NetLegacyOptions *opts = net->opts;
 982         legacy.id = net->id;
 983         netdev = &legacy;
 984         /* missing optional values have been initialized to "all bits zero" */
 985         name = net->has_id ? net->id : net->name;
 986
 987         if (net->has_name) {
 988             warn_report("The 'name' parameter is deprecated, use 'id' instead");
 989         }
 990
 991         /* Map the old options to the new flat type */
 992         switch (opts->type) {
 993         case NET_LEGACY_OPTIONS_TYPE_NONE:
 994             return 0; /* nothing to do */
 995         case NET_LEGACY_OPTIONS_TYPE_NIC:
 996             legacy.type = NET_CLIENT_DRIVER_NIC;
 997             legacy.u.nic = opts->u.nic;
 998             break;
 999         case NET_LEGACY_OPTIONS_TYPE_USER:
1000             legacy.type = NET_CLIENT_DRIVER_USER;
1001             legacy.u.user = opts->u.user;
1002             break;
1003         case NET_LEGACY_OPTIONS_TYPE_TAP:
1004             legacy.type = NET_CLIENT_DRIVER_TAP;
1005             legacy.u.tap = opts->u.tap;
1006             break;
1007         case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1008             legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1009             legacy.u.l2tpv3 = opts->u.l2tpv3;
1010             break;
1011         case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1012             legacy.type = NET_CLIENT_DRIVER_SOCKET;
1013             legacy.u.socket = opts->u.socket;
1014             break;
1015         case NET_LEGACY_OPTIONS_TYPE_VDE:
1016             legacy.type = NET_CLIENT_DRIVER_VDE;
1017             legacy.u.vde = opts->u.vde;
1018             break;
1019         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1020             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1021             legacy.u.bridge = opts->u.bridge;
1022             break;
1023         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1024             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1025             legacy.u.netmap = opts->u.netmap;
1026             break;
1027         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1028             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1029             legacy.u.vhost_user = opts->u.vhost_user;
1030             break;
1031         default:
1032             abort();
1033         }
1034
1035         if (!net_client_init_fun[netdev->type]) {
1036             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1037                        "a net backend type (maybe it is not compiled "
1038                        "into this binary)");
1039             return -1;
1040         }
1041
1042         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1043         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1044             !opts->u.nic.has_netdev) {
1045             peer = net_hub_add_port(0, NULL, NULL);
1046         }
1047     }
1048
1049     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1050         /* FIXME drop when all init functions store an Error */
1051         if (errp && !*errp) {
1052             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1053                        NetClientDriver_str(netdev->type));
1054         }
1055         return -1;
1056     }
1057     return 0;
1058 }
1059
1060 static void show_netdevs(void)
1061 {
1062     int idx;
1063     const char *available_netdevs[] = {
1064         "socket",
1065         "hubport",
1066         "tap",
1067 #ifdef CONFIG_SLIRP
1068         "user",
1069 #endif
1070 #ifdef CONFIG_L2TPV3
1071         "l2tpv3",
1072 #endif
1073 #ifdef CONFIG_VDE
1074         "vde",
1075 #endif
1076 #ifdef CONFIG_NET_BRIDGE
1077         "bridge",
1078 #endif
1079 #ifdef CONFIG_NETMAP
1080         "netmap",
1081 #endif
1082 #ifdef CONFIG_POSIX
1083         "vhost-user",
1084 #endif
1085     };
1086
1087     printf("Available netdev backend types:\n");
1088     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1089         puts(available_netdevs[idx]);
1090     }
1091 }
1092
1093 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1094 {
1095     void *object = NULL;
1096     Error *err = NULL;
1097     int ret = -1;
1098     Visitor *v = opts_visitor_new(opts);
1099
1100     const char *type = qemu_opt_get(opts, "type");
1101
1102     if (is_netdev && type && is_help_option(type)) {
1103         show_netdevs();
1104         exit(0);
1105     } else {
1106         /* Parse convenience option format ip6-net=fec0::0[/64] */
1107         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1108
1109         if (ip6_net) {
1110             char buf[strlen(ip6_net) + 1];
1111
1112             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1113                 /* Default 64bit prefix length.  */
1114                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1115                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1116             } else {
1117                 /* User-specified prefix length.  */
1118                 unsigned long len;
1119                 int err;
1120
1121                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1122                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1123
1124                 if (err) {
1125                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1126                               "ipv6-prefix", "a number");
1127                 } else {
1128                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1129                                         &error_abort);
1130                 }
1131             }
1132             qemu_opt_unset(opts, "ipv6-net");
1133         }
1134     }
1135
1136     if (is_netdev) {
1137         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1138     } else {
1139         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1140     }
1141
1142     if (!err) {
1143         ret = net_client_init1(object, is_netdev, &err);
1144     }
1145
1146     if (is_netdev) {
1147         qapi_free_Netdev(object);
1148     } else {
1149         qapi_free_NetLegacy(object);
1150     }
1151
1152     error_propagate(errp, err);
1153     visit_free(v);
1154     return ret;
1155 }
1156
1157 void netdev_add(QemuOpts *opts, Error **errp)
1158 {
1159     net_client_init(opts, true, errp);
1160 }
1161
1162 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1163 {
1164     Error *local_err = NULL;
1165     QemuOptsList *opts_list;
1166     QemuOpts *opts;
1167
1168     opts_list = qemu_find_opts_err("netdev", &local_err);
1169     if (local_err) {
1170         goto out;
1171     }
1172
1173     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1174     if (local_err) {
1175         goto out;
1176     }
1177
1178     netdev_add(opts, &local_err);
1179     if (local_err) {
1180         qemu_opts_del(opts);
1181         goto out;
1182     }
1183
1184 out:
1185     error_propagate(errp, local_err);
1186 }
1187
1188 void qmp_netdev_del(const char *id, Error **errp)
1189 {
1190     NetClientState *nc;
1191     QemuOpts *opts;
1192
1193     nc = qemu_find_netdev(id);
1194     if (!nc) {
1195         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1196                   "Device '%s' not found", id);
1197         return;
1198     }
1199
1200     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1201     if (!opts) {
1202         error_setg(errp, "Device '%s' is not a netdev", id);
1203         return;
1204     }
1205
1206     qemu_del_net_client(nc);
1207     qemu_opts_del(opts);
1208 }
1209
1210 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1211 {
1212     char *str;
1213     ObjectProperty *prop;
1214     ObjectPropertyIterator iter;
1215     Visitor *v;
1216
1217     /* generate info str */
1218     object_property_iter_init(&iter, OBJECT(nf));
1219     while ((prop = object_property_iter_next(&iter))) {
1220         if (!strcmp(prop->name, "type")) {
1221             continue;
1222         }
1223         v = string_output_visitor_new(false, &str);
1224         object_property_get(OBJECT(nf), v, prop->name, NULL);
1225         visit_complete(v, &str);
1226         visit_free(v);
1227         monitor_printf(mon, ",%s=%s", prop->name, str);
1228         g_free(str);
1229     }
1230     monitor_printf(mon, "\n");
1231 }
1232
1233 void print_net_client(Monitor *mon, NetClientState *nc)
1234 {
1235     NetFilterState *nf;
1236
1237     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1238                    nc->queue_index,
1239                    NetClientDriver_str(nc->info->type),
1240                    nc->info_str);
1241     if (!QTAILQ_EMPTY(&nc->filters)) {
1242         monitor_printf(mon, "filters:\n");
1243     }
1244     QTAILQ_FOREACH(nf, &nc->filters, next) {
1245         char *path = object_get_canonical_path_component(OBJECT(nf));
1246
1247         monitor_printf(mon, "  - %s: type=%s", path,
1248                        object_get_typename(OBJECT(nf)));
1249         netfilter_print_info(mon, nf);
1250         g_free(path);
1251     }
1252 }
1253
1254 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1255                                       Error **errp)
1256 {
1257     NetClientState *nc;
1258     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1259
1260     QTAILQ_FOREACH(nc, &net_clients, next) {
1261         RxFilterInfoList *entry;
1262         RxFilterInfo *info;
1263
1264         if (has_name && strcmp(nc->name, name) != 0) {
1265             continue;
1266         }
1267
1268         /* only query rx-filter information of NIC */
1269         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1270             if (has_name) {
1271                 error_setg(errp, "net client(%s) isn't a NIC", name);
1272                 return NULL;
1273             }
1274             continue;
1275         }
1276
1277         /* only query information on queue 0 since the info is per nic,
1278          * not per queue
1279          */
1280         if (nc->queue_index != 0)
1281             continue;
1282
1283         if (nc->info->query_rx_filter) {
1284             info = nc->info->query_rx_filter(nc);
1285             entry = g_malloc0(sizeof(*entry));
1286             entry->value = info;
1287
1288             if (!filter_list) {
1289                 filter_list = entry;
1290             } else {
1291                 last_entry->next = entry;
1292             }
1293             last_entry = entry;
1294         } else if (has_name) {
1295             error_setg(errp, "net client(%s) doesn't support"
1296                        " rx-filter querying", name);
1297             return NULL;
1298         }
1299
1300         if (has_name) {
1301             break;
1302         }
1303     }
1304
1305     if (filter_list == NULL && has_name) {
1306         error_setg(errp, "invalid net client name: %s", name);
1307     }
1308
1309     return filter_list;
1310 }
1311
1312 void hmp_info_network(Monitor *mon, const QDict *qdict)
1313 {
1314     NetClientState *nc, *peer;
1315     NetClientDriver type;
1316
1317     net_hub_info(mon);
1318
1319     QTAILQ_FOREACH(nc, &net_clients, next) {
1320         peer = nc->peer;
1321         type = nc->info->type;
1322
1323         /* Skip if already printed in hub info */
1324         if (net_hub_id_for_client(nc, NULL) == 0) {
1325             continue;
1326         }
1327
1328         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1329             print_net_client(mon, nc);
1330         } /* else it's a netdev connected to a NIC, printed with the NIC */
1331         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1332             monitor_printf(mon, " \\ ");
1333             print_net_client(mon, peer);
1334         }
1335     }
1336 }
1337
1338 void qmp_set_link(const char *name, bool up, Error **errp)
1339 {
1340     NetClientState *ncs[MAX_QUEUE_NUM];
1341     NetClientState *nc;
1342     int queues, i;
1343
1344     queues = qemu_find_net_clients_except(name, ncs,
1345                                           NET_CLIENT_DRIVER__MAX,
1346                                           MAX_QUEUE_NUM);
1347
1348     if (queues == 0) {
1349         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1350                   "Device '%s' not found", name);
1351         return;
1352     }
1353     nc = ncs[0];
1354
1355     for (i = 0; i < queues; i++) {
1356         ncs[i]->link_down = !up;
1357     }
1358
1359     if (nc->info->link_status_changed) {
1360         nc->info->link_status_changed(nc);
1361     }
1362
1363     if (nc->peer) {
1364         /* Change peer link only if the peer is NIC and then notify peer.
1365          * If the peer is a HUBPORT or a backend, we do not change the
1366          * link status.
1367          *
1368          * This behavior is compatible with qemu hubs where there could be
1369          * multiple clients that can still communicate with each other in
1370          * disconnected mode. For now maintain this compatibility.
1371          */
1372         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1373             for (i = 0; i < queues; i++) {
1374                 ncs[i]->peer->link_down = !up;
1375             }
1376         }
1377         if (nc->peer->info->link_status_changed) {
1378             nc->peer->info->link_status_changed(nc->peer);
1379         }
1380     }
1381 }
1382
1383 static void net_vm_change_state_handler(void *opaque, int running,
1384                                         RunState state)
1385 {
1386     NetClientState *nc;
1387     NetClientState *tmp;
1388
1389     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1390         if (running) {
1391             /* Flush queued packets and wake up backends. */
1392             if (nc->peer && qemu_can_send_packet(nc)) {
1393                 qemu_flush_queued_packets(nc->peer);
1394             }
1395         } else {
1396             /* Complete all queued packets, to guarantee we don't modify
1397              * state later when VM is not running.
1398              */
1399             qemu_flush_or_purge_queued_packets(nc, true);
1400         }
1401     }
1402 }
1403
1404 void net_cleanup(void)
1405 {
1406     NetClientState *nc;
1407
1408     /* We may del multiple entries during qemu_del_net_client(),
1409      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1410      */
1411     while (!QTAILQ_EMPTY(&net_clients)) {
1412         nc = QTAILQ_FIRST(&net_clients);
1413         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1414             qemu_del_nic(qemu_get_nic(nc));
1415         } else {
1416             qemu_del_net_client(nc);
1417         }
1418     }
1419
1420     qemu_del_vm_change_state_handler(net_change_state_entry);
1421 }
1422
1423 void net_check_clients(void)
1424 {
1425     NetClientState *nc;
1426     int i;
1427
1428     net_hub_check_clients();
1429
1430     QTAILQ_FOREACH(nc, &net_clients, next) {
1431         if (!nc->peer) {
1432             warn_report("%s %s has no peer",
1433                         nc->info->type == NET_CLIENT_DRIVER_NIC
1434                         ? "nic" : "netdev",
1435                         nc->name);
1436         }
1437     }
1438
1439     /* Check that all NICs requested via -net nic actually got created.
1440      * NICs created via -device don't need to be checked here because
1441      * they are always instantiated.
1442      */
1443     for (i = 0; i < MAX_NICS; i++) {
1444         NICInfo *nd = &nd_table[i];
1445         if (nd->used && !nd->instantiated) {
1446             warn_report("requested NIC (%s, model %s) "
1447                         "was not created (not supported by this machine?)",
1448                         nd->name ? nd->name : "anonymous",
1449                         nd->model ? nd->model : "unspecified");
1450         }
1451     }
1452 }
1453
1454 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1455 {
1456     return net_client_init(opts, false, errp);
1457 }
1458
1459 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1460 {
1461     return net_client_init(opts, true, errp);
1462 }
1463
1464 /* For the convenience "--nic" parameter */
1465 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1466 {
1467     char *mac, *nd_id;
1468     int idx, ret;
1469     NICInfo *ni;
1470     const char *type;
1471
1472     type = qemu_opt_get(opts, "type");
1473     if (type && g_str_equal(type, "none")) {
1474         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1475     }
1476
1477     idx = nic_get_free_idx();
1478     if (idx == -1 || nb_nics >= MAX_NICS) {
1479         error_setg(errp, "no more on-board/default NIC slots available");
1480         return -1;
1481     }
1482
1483     if (!type) {
1484         qemu_opt_set(opts, "type", "user", &error_abort);
1485     }
1486
1487     ni = &nd_table[idx];
1488     memset(ni, 0, sizeof(*ni));
1489     ni->model = qemu_opt_get_del(opts, "model");
1490
1491     /* Create an ID if the user did not specify one */
1492     nd_id = g_strdup(qemu_opts_id(opts));
1493     if (!nd_id) {
1494         nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1495         qemu_opts_set_id(opts, nd_id);
1496     }
1497
1498     /* Handle MAC address */
1499     mac = qemu_opt_get_del(opts, "mac");
1500     if (mac) {
1501         ret = net_parse_macaddr(ni->macaddr.a, mac);
1502         g_free(mac);
1503         if (ret) {
1504             error_setg(errp, "invalid syntax for ethernet address");
1505             goto out;
1506         }
1507         if (is_multicast_ether_addr(ni->macaddr.a)) {
1508             error_setg(errp, "NIC cannot have multicast MAC address");
1509             ret = -1;
1510             goto out;
1511         }
1512     }
1513     qemu_macaddr_default_if_unset(&ni->macaddr);
1514
1515     ret = net_client_init(opts, true, errp);
1516     if (ret == 0) {
1517         ni->netdev = qemu_find_netdev(nd_id);
1518         ni->used = true;
1519         nb_nics++;
1520     }
1521
1522 out:
1523     g_free(nd_id);
1524     return ret;
1525 }
1526
1527 int net_init_clients(Error **errp)
1528 {
1529     net_change_state_entry =
1530         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1531
1532     QTAILQ_INIT(&net_clients);
1533
1534     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1535                           net_init_netdev, NULL, errp)) {
1536         return -1;
1537     }
1538
1539     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1540         return -1;
1541     }
1542
1543     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1544         return -1;
1545     }
1546
1547     return 0;
1548 }
1549
1550 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1551 {
1552     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1553         return -1;
1554     }
1555
1556     return 0;
1557 }
1558
1559 /* From FreeBSD */
1560 /* XXX: optimize */
1561 uint32_t net_crc32(const uint8_t *p, int len)
1562 {
1563     uint32_t crc;
1564     int carry, i, j;
1565     uint8_t b;
1566
1567     crc = 0xffffffff;
1568     for (i = 0; i < len; i++) {
1569         b = *p++;
1570         for (j = 0; j < 8; j++) {
1571             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1572             crc <<= 1;
1573             b >>= 1;
1574             if (carry) {
1575                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1576             }
1577         }
1578     }
1579
1580     return crc;
1581 }
1582
1583 uint32_t net_crc32_le(const uint8_t *p, int len)
1584 {
1585     uint32_t crc;
1586     int carry, i, j;
1587     uint8_t b;
1588
1589     crc = 0xffffffff;
1590     for (i = 0; i < len; i++) {
1591         b = *p++;
1592         for (j = 0; j < 8; j++) {
1593             carry = (crc & 0x1) ^ (b & 0x01);
1594             crc >>= 1;
1595             b >>= 1;
1596             if (carry) {
1597                 crc ^= POLYNOMIAL_LE;
1598             }
1599         }
1600     }
1601
1602     return crc;
1603 }
1604
1605 QemuOptsList qemu_netdev_opts = {
1606     .name = "netdev",
1607     .implied_opt_name = "type",
1608     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1609     .desc = {
1610         /*
1611          * no elements => accept any params
1612          * validation will happen later
1613          */
1614         { /* end of list */ }
1615     },
1616 };
1617
1618 QemuOptsList qemu_nic_opts = {
1619     .name = "nic",
1620     .implied_opt_name = "type",
1621     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1622     .desc = {
1623         /*
1624          * no elements => accept any params
1625          * validation will happen later
1626          */
1627         { /* end of list */ }
1628     },
1629 };
1630
1631 QemuOptsList qemu_net_opts = {
1632     .name = "net",
1633     .implied_opt_name = "type",
1634     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1635     .desc = {
1636         /*
1637          * no elements => accept any params
1638          * validation will happen later
1639          */
1640         { /* end of list */ }
1641     },
1642 };
1643
1644 void net_socket_rs_init(SocketReadState *rs,
1645                         SocketReadStateFinalize *finalize,
1646                         bool vnet_hdr)
1647 {
1648     rs->state = 0;
1649     rs->vnet_hdr = vnet_hdr;
1650     rs->index = 0;
1651     rs->packet_len = 0;
1652     rs->vnet_hdr_len = 0;
1653     memset(rs->buf, 0, sizeof(rs->buf));
1654     rs->finalize = finalize;
1655 }
1656
1657 /*
1658  * Returns
1659  * 0: success
1660  * -1: error occurs
1661  */
1662 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1663 {
1664     unsigned int l;
1665
1666     while (size > 0) {
1667         /* Reassemble a packet from the network.
1668          * 0 = getting length.
1669          * 1 = getting vnet header length.
1670          * 2 = getting data.
1671          */
1672         switch (rs->state) {
1673         case 0:
1674             l = 4 - rs->index;
1675             if (l > size) {
1676                 l = size;
1677             }
1678             memcpy(rs->buf + rs->index, buf, l);
1679             buf += l;
1680             size -= l;
1681             rs->index += l;
1682             if (rs->index == 4) {
1683                 /* got length */
1684                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1685                 rs->index = 0;
1686                 if (rs->vnet_hdr) {
1687                     rs->state = 1;
1688                 } else {
1689                     rs->state = 2;
1690                     rs->vnet_hdr_len = 0;
1691                 }
1692             }
1693             break;
1694         case 1:
1695             l = 4 - rs->index;
1696             if (l > size) {
1697                 l = size;
1698             }
1699             memcpy(rs->buf + rs->index, buf, l);
1700             buf += l;
1701             size -= l;
1702             rs->index += l;
1703             if (rs->index == 4) {
1704                 /* got vnet header length */
1705                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1706                 rs->index = 0;
1707                 rs->state = 2;
1708             }
1709             break;
1710         case 2:
1711             l = rs->packet_len - rs->index;
1712             if (l > size) {
1713                 l = size;
1714             }
1715             if (rs->index + l <= sizeof(rs->buf)) {
1716                 memcpy(rs->buf + rs->index, buf, l);
1717             } else {
1718                 fprintf(stderr, "serious error: oversized packet received,"
1719                     "connection terminated.\n");
1720                 rs->index = rs->state = 0;
1721                 return -1;
1722             }
1723
1724             rs->index += l;
1725             buf += l;
1726             size -= l;
1727             if (rs->index >= rs->packet_len) {
1728                 rs->index = 0;
1729                 rs->state = 0;
1730                 assert(rs->finalize);
1731                 rs->finalize(rs);
1732             }
1733             break;
1734         }
1735     }
1736
1737     assert(size == 0);
1738     return 0;
1739 }