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 #include "qemu/osdep.h"
  25
  26 #include "net/net.h"
  27 #include "clients.h"
  28 #include "hub.h"
  29 #include "net/slirp.h"
  30 #include "net/eth.h"
  31 #include "util.h"
  32
  33 #include "monitor/monitor.h"
  34 #include "qemu-common.h"
  35 #include "qemu/help_option.h"
  36 #include "qapi/qmp/qerror.h"
  37 #include "qemu/error-report.h"
  38 #include "qemu/sockets.h"
  39 #include "qemu/cutils.h"
  40 #include "qemu/config-file.h"
  41 #include "qmp-commands.h"
  42 #include "hw/qdev.h"
  43 #include "qemu/iov.h"
  44 #include "qemu/main-loop.h"
  45 #include "qapi-visit.h"
  46 #include "qapi/opts-visitor.h"
  47 #include "sysemu/sysemu.h"
  48 #include "net/filter.h"
  49 #include "qapi/string-output-visitor.h"
  50
  51 /* Net bridge is currently not supported for W32. */
  52 #if !defined(_WIN32)
  53 # define CONFIG_NET_BRIDGE
  54 #endif
  55
  56 static VMChangeStateEntry *net_change_state_entry;
  57 static QTAILQ_HEAD(, NetClientState) net_clients;
  58
  59 const char *host_net_devices[] = {
  60     "tap",
  61     "socket",
  62     "dump",
  63 #ifdef CONFIG_NET_BRIDGE
  64     "bridge",
  65 #endif
  66 #ifdef CONFIG_NETMAP
  67     "netmap",
  68 #endif
  69 #ifdef CONFIG_SLIRP
  70     "user",
  71 #endif
  72 #ifdef CONFIG_VDE
  73     "vde",
  74 #endif
  75     "vhost-user",
  76     NULL,
  77 };
  78
  79 int default_net = 1;
  80
  81 /***********************************************************/
  82 /* network device redirectors */
  83
  84 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  85 {
  86     const char *p, *p1;
  87     int len;
  88     p = *pp;
  89     p1 = strchr(p, sep);
  90     if (!p1)
  91         return -1;
  92     len = p1 - p;
  93     p1++;
  94     if (buf_size > 0) {
  95         if (len > buf_size - 1)
  96             len = buf_size - 1;
  97         memcpy(buf, p, len);
  98         buf[len] = '\0';
  99     }
 100     *pp = p1;
 101     return 0;
 102 }
 103
 104 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 105 {
 106     char buf[512];
 107     struct hostent *he;
 108     const char *p, *r;
 109     int port;
 110
 111     p = str;
 112     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 113         return -1;
 114     saddr->sin_family = AF_INET;
 115     if (buf[0] == '\0') {
 116         saddr->sin_addr.s_addr = 0;
 117     } else {
 118         if (qemu_isdigit(buf[0])) {
 119             if (!inet_aton(buf, &saddr->sin_addr))
 120                 return -1;
 121         } else {
 122             if ((he = gethostbyname(buf)) == NULL)
 123                 return - 1;
 124             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 125         }
 126     }
 127     port = strtol(p, (char **)&r, 0);
 128     if (r == p)
 129         return -1;
 130     saddr->sin_port = htons(port);
 131     return 0;
 132 }
 133
 134 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 135 {
 136     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 137                            macaddr[0], macaddr[1], macaddr[2],
 138                            macaddr[3], macaddr[4], macaddr[5]);
 139 }
 140
 141 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 142 {
 143     snprintf(nc->info_str, sizeof(nc->info_str),
 144              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 145              nc->model,
 146              macaddr[0], macaddr[1], macaddr[2],
 147              macaddr[3], macaddr[4], macaddr[5]);
 148 }
 149
 150 static int mac_table[256] = {0};
 151
 152 static void qemu_macaddr_set_used(MACAddr *macaddr)
 153 {
 154     int index;
 155
 156     for (index = 0x56; index < 0xFF; index++) {
 157         if (macaddr->a[5] == index) {
 158             mac_table[index]++;
 159         }
 160     }
 161 }
 162
 163 static void qemu_macaddr_set_free(MACAddr *macaddr)
 164 {
 165     int index;
 166     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 167
 168     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 169         return;
 170     }
 171     for (index = 0x56; index < 0xFF; index++) {
 172         if (macaddr->a[5] == index) {
 173             mac_table[index]--;
 174         }
 175     }
 176 }
 177
 178 static int qemu_macaddr_get_free(void)
 179 {
 180     int index;
 181
 182     for (index = 0x56; index < 0xFF; index++) {
 183         if (mac_table[index] == 0) {
 184             return index;
 185         }
 186     }
 187
 188     return -1;
 189 }
 190
 191 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 192 {
 193     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 194     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 195
 196     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 197         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 198             return;
 199         } else {
 200             qemu_macaddr_set_used(macaddr);
 201             return;
 202         }
 203     }
 204
 205     macaddr->a[0] = 0x52;
 206     macaddr->a[1] = 0x54;
 207     macaddr->a[2] = 0x00;
 208     macaddr->a[3] = 0x12;
 209     macaddr->a[4] = 0x34;
 210     macaddr->a[5] = qemu_macaddr_get_free();
 211     qemu_macaddr_set_used(macaddr);
 212 }
 213
 214 /**
 215  * Generate a name for net client
 216  *
 217  * Only net clients created with the legacy -net option and NICs need this.
 218  */
 219 static char *assign_name(NetClientState *nc1, const char *model)
 220 {
 221     NetClientState *nc;
 222     int id = 0;
 223
 224     QTAILQ_FOREACH(nc, &net_clients, next) {
 225         if (nc == nc1) {
 226             continue;
 227         }
 228         if (strcmp(nc->model, model) == 0) {
 229             id++;
 230         }
 231     }
 232
 233     return g_strdup_printf("%s.%d", model, id);
 234 }
 235
 236 static void qemu_net_client_destructor(NetClientState *nc)
 237 {
 238     g_free(nc);
 239 }
 240
 241 static void qemu_net_client_setup(NetClientState *nc,
 242                                   NetClientInfo *info,
 243                                   NetClientState *peer,
 244                                   const char *model,
 245                                   const char *name,
 246                                   NetClientDestructor *destructor)
 247 {
 248     nc->info = info;
 249     nc->model = g_strdup(model);
 250     if (name) {
 251         nc->name = g_strdup(name);
 252     } else {
 253         nc->name = assign_name(nc, model);
 254     }
 255
 256     if (peer) {
 257         assert(!peer->peer);
 258         nc->peer = peer;
 259         peer->peer = nc;
 260     }
 261     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 262
 263     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 264     nc->destructor = destructor;
 265     QTAILQ_INIT(&nc->filters);
 266 }
 267
 268 NetClientState *qemu_new_net_client(NetClientInfo *info,
 269                                     NetClientState *peer,
 270                                     const char *model,
 271                                     const char *name)
 272 {
 273     NetClientState *nc;
 274
 275     assert(info->size >= sizeof(NetClientState));
 276
 277     nc = g_malloc0(info->size);
 278     qemu_net_client_setup(nc, info, peer, model, name,
 279                           qemu_net_client_destructor);
 280
 281     return nc;
 282 }
 283
 284 NICState *qemu_new_nic(NetClientInfo *info,
 285                        NICConf *conf,
 286                        const char *model,
 287                        const char *name,
 288                        void *opaque)
 289 {
 290     NetClientState **peers = conf->peers.ncs;
 291     NICState *nic;
 292     int i, queues = MAX(1, conf->peers.queues);
 293
 294     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 295     assert(info->size >= sizeof(NICState));
 296
 297     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 298     nic->ncs = (void *)nic + info->size;
 299     nic->conf = conf;
 300     nic->opaque = opaque;
 301
 302     for (i = 0; i < queues; i++) {
 303         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 304                               NULL);
 305         nic->ncs[i].queue_index = i;
 306     }
 307
 308     return nic;
 309 }
 310
 311 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 312 {
 313     return nic->ncs + queue_index;
 314 }
 315
 316 NetClientState *qemu_get_queue(NICState *nic)
 317 {
 318     return qemu_get_subqueue(nic, 0);
 319 }
 320
 321 NICState *qemu_get_nic(NetClientState *nc)
 322 {
 323     NetClientState *nc0 = nc - nc->queue_index;
 324
 325     return (NICState *)((void *)nc0 - nc->info->size);
 326 }
 327
 328 void *qemu_get_nic_opaque(NetClientState *nc)
 329 {
 330     NICState *nic = qemu_get_nic(nc);
 331
 332     return nic->opaque;
 333 }
 334
 335 static void qemu_cleanup_net_client(NetClientState *nc)
 336 {
 337     QTAILQ_REMOVE(&net_clients, nc, next);
 338
 339     if (nc->info->cleanup) {
 340         nc->info->cleanup(nc);
 341     }
 342 }
 343
 344 static void qemu_free_net_client(NetClientState *nc)
 345 {
 346     if (nc->incoming_queue) {
 347         qemu_del_net_queue(nc->incoming_queue);
 348     }
 349     if (nc->peer) {
 350         nc->peer->peer = NULL;
 351     }
 352     g_free(nc->name);
 353     g_free(nc->model);
 354     if (nc->destructor) {
 355         nc->destructor(nc);
 356     }
 357 }
 358
 359 void qemu_del_net_client(NetClientState *nc)
 360 {
 361     NetClientState *ncs[MAX_QUEUE_NUM];
 362     int queues, i;
 363     NetFilterState *nf, *next;
 364
 365     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 366
 367     /* If the NetClientState belongs to a multiqueue backend, we will change all
 368      * other NetClientStates also.
 369      */
 370     queues = qemu_find_net_clients_except(nc->name, ncs,
 371                                           NET_CLIENT_OPTIONS_KIND_NIC,
 372                                           MAX_QUEUE_NUM);
 373     assert(queues != 0);
 374
 375     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 376         object_unparent(OBJECT(nf));
 377     }
 378
 379     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 380     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 381         NICState *nic = qemu_get_nic(nc->peer);
 382         if (nic->peer_deleted) {
 383             return;
 384         }
 385         nic->peer_deleted = true;
 386
 387         for (i = 0; i < queues; i++) {
 388             ncs[i]->peer->link_down = true;
 389         }
 390
 391         if (nc->peer->info->link_status_changed) {
 392             nc->peer->info->link_status_changed(nc->peer);
 393         }
 394
 395         for (i = 0; i < queues; i++) {
 396             qemu_cleanup_net_client(ncs[i]);
 397         }
 398
 399         return;
 400     }
 401
 402     for (i = 0; i < queues; i++) {
 403         qemu_cleanup_net_client(ncs[i]);
 404         qemu_free_net_client(ncs[i]);
 405     }
 406 }
 407
 408 void qemu_del_nic(NICState *nic)
 409 {
 410     int i, queues = MAX(nic->conf->peers.queues, 1);
 411
 412     qemu_macaddr_set_free(&nic->conf->macaddr);
 413
 414     /* If this is a peer NIC and peer has already been deleted, free it now. */
 415     if (nic->peer_deleted) {
 416         for (i = 0; i < queues; i++) {
 417             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 418         }
 419     }
 420
 421     for (i = queues - 1; i >= 0; i--) {
 422         NetClientState *nc = qemu_get_subqueue(nic, i);
 423
 424         qemu_cleanup_net_client(nc);
 425         qemu_free_net_client(nc);
 426     }
 427
 428     g_free(nic);
 429 }
 430
 431 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 432 {
 433     NetClientState *nc;
 434
 435     QTAILQ_FOREACH(nc, &net_clients, next) {
 436         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 437             if (nc->queue_index == 0) {
 438                 func(qemu_get_nic(nc), opaque);
 439             }
 440         }
 441     }
 442 }
 443
 444 bool qemu_has_ufo(NetClientState *nc)
 445 {
 446     if (!nc || !nc->info->has_ufo) {
 447         return false;
 448     }
 449
 450     return nc->info->has_ufo(nc);
 451 }
 452
 453 bool qemu_has_vnet_hdr(NetClientState *nc)
 454 {
 455     if (!nc || !nc->info->has_vnet_hdr) {
 456         return false;
 457     }
 458
 459     return nc->info->has_vnet_hdr(nc);
 460 }
 461
 462 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 463 {
 464     if (!nc || !nc->info->has_vnet_hdr_len) {
 465         return false;
 466     }
 467
 468     return nc->info->has_vnet_hdr_len(nc, len);
 469 }
 470
 471 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 472 {
 473     if (!nc || !nc->info->using_vnet_hdr) {
 474         return;
 475     }
 476
 477     nc->info->using_vnet_hdr(nc, enable);
 478 }
 479
 480 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 481                           int ecn, int ufo)
 482 {
 483     if (!nc || !nc->info->set_offload) {
 484         return;
 485     }
 486
 487     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 488 }
 489
 490 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 491 {
 492     if (!nc || !nc->info->set_vnet_hdr_len) {
 493         return;
 494     }
 495
 496     nc->info->set_vnet_hdr_len(nc, len);
 497 }
 498
 499 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 500 {
 501 #ifdef HOST_WORDS_BIGENDIAN
 502     if (!nc || !nc->info->set_vnet_le) {
 503         return -ENOSYS;
 504     }
 505
 506     return nc->info->set_vnet_le(nc, is_le);
 507 #else
 508     return 0;
 509 #endif
 510 }
 511
 512 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 513 {
 514 #ifdef HOST_WORDS_BIGENDIAN
 515     return 0;
 516 #else
 517     if (!nc || !nc->info->set_vnet_be) {
 518         return -ENOSYS;
 519     }
 520
 521     return nc->info->set_vnet_be(nc, is_be);
 522 #endif
 523 }
 524
 525 int qemu_can_send_packet(NetClientState *sender)
 526 {
 527     int vm_running = runstate_is_running();
 528
 529     if (!vm_running) {
 530         return 0;
 531     }
 532
 533     if (!sender->peer) {
 534         return 1;
 535     }
 536
 537     if (sender->peer->receive_disabled) {
 538         return 0;
 539     } else if (sender->peer->info->can_receive &&
 540                !sender->peer->info->can_receive(sender->peer)) {
 541         return 0;
 542     }
 543     return 1;
 544 }
 545
 546 static ssize_t filter_receive_iov(NetClientState *nc,
 547                                   NetFilterDirection direction,
 548                                   NetClientState *sender,
 549                                   unsigned flags,
 550                                   const struct iovec *iov,
 551                                   int iovcnt,
 552                                   NetPacketSent *sent_cb)
 553 {
 554     ssize_t ret = 0;
 555     NetFilterState *nf = NULL;
 556
 557     if (direction == NET_FILTER_DIRECTION_TX) {
 558         QTAILQ_FOREACH(nf, &nc->filters, next) {
 559             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 560                                          iovcnt, sent_cb);
 561             if (ret) {
 562                 return ret;
 563             }
 564         }
 565     } else {
 566         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
 567             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 568                                          iovcnt, sent_cb);
 569             if (ret) {
 570                 return ret;
 571             }
 572         }
 573     }
 574
 575     return ret;
 576 }
 577
 578 static ssize_t filter_receive(NetClientState *nc,
 579                               NetFilterDirection direction,
 580                               NetClientState *sender,
 581                               unsigned flags,
 582                               const uint8_t *data,
 583                               size_t size,
 584                               NetPacketSent *sent_cb)
 585 {
 586     struct iovec iov = {
 587         .iov_base = (void *)data,
 588         .iov_len = size
 589     };
 590
 591     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 592 }
 593
 594 void qemu_purge_queued_packets(NetClientState *nc)
 595 {
 596     if (!nc->peer) {
 597         return;
 598     }
 599
 600     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 601 }
 602
 603 static
 604 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 605 {
 606     nc->receive_disabled = 0;
 607
 608     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 609         if (net_hub_flush(nc->peer)) {
 610             qemu_notify_event();
 611         }
 612     }
 613     if (qemu_net_queue_flush(nc->incoming_queue)) {
 614         /* We emptied the queue successfully, signal to the IO thread to repoll
 615          * the file descriptor (for tap, for example).
 616          */
 617         qemu_notify_event();
 618     } else if (purge) {
 619         /* Unable to empty the queue, purge remaining packets */
 620         qemu_net_queue_purge(nc->incoming_queue, nc);
 621     }
 622 }
 623
 624 void qemu_flush_queued_packets(NetClientState *nc)
 625 {
 626     qemu_flush_or_purge_queued_packets(nc, false);
 627 }
 628
 629 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 630                                                  unsigned flags,
 631                                                  const uint8_t *buf, int size,
 632                                                  NetPacketSent *sent_cb)
 633 {
 634     NetQueue *queue;
 635     int ret;
 636
 637 #ifdef DEBUG_NET
 638     printf("qemu_send_packet_async:\n");
 639     qemu_hexdump((const char *)buf, stdout, "net", size);
 640 #endif
 641
 642     if (sender->link_down || !sender->peer) {
 643         return size;
 644     }
 645
 646     /* Let filters handle the packet first */
 647     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 648                          sender, flags, buf, size, sent_cb);
 649     if (ret) {
 650         return ret;
 651     }
 652
 653     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 654                          sender, flags, buf, size, sent_cb);
 655     if (ret) {
 656         return ret;
 657     }
 658
 659     queue = sender->peer->incoming_queue;
 660
 661     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 662 }
 663
 664 ssize_t qemu_send_packet_async(NetClientState *sender,
 665                                const uint8_t *buf, int size,
 666                                NetPacketSent *sent_cb)
 667 {
 668     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 669                                              buf, size, sent_cb);
 670 }
 671
 672 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 673 {
 674     qemu_send_packet_async(nc, buf, size, NULL);
 675 }
 676
 677 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 678 {
 679     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 680                                              buf, size, NULL);
 681 }
 682
 683 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 684                                int iovcnt, unsigned flags)
 685 {
 686     uint8_t *buf = NULL;
 687     uint8_t *buffer;
 688     size_t offset;
 689     ssize_t ret;
 690
 691     if (iovcnt == 1) {
 692         buffer = iov[0].iov_base;
 693         offset = iov[0].iov_len;
 694     } else {
 695         buf = g_new(uint8_t, NET_BUFSIZE);
 696         buffer = buf;
 697         offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE);
 698     }
 699
 700     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 701         ret = nc->info->receive_raw(nc, buffer, offset);
 702     } else {
 703         ret = nc->info->receive(nc, buffer, offset);
 704     }
 705
 706     g_free(buf);
 707     return ret;
 708 }
 709
 710 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 711                                 unsigned flags,
 712                                 const struct iovec *iov,
 713                                 int iovcnt,
 714                                 void *opaque)
 715 {
 716     NetClientState *nc = opaque;
 717     int ret;
 718
 719     if (nc->link_down) {
 720         return iov_size(iov, iovcnt);
 721     }
 722
 723     if (nc->receive_disabled) {
 724         return 0;
 725     }
 726
 727     if (nc->info->receive_iov) {
 728         ret = nc->info->receive_iov(nc, iov, iovcnt);
 729     } else {
 730         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 731     }
 732
 733     if (ret == 0) {
 734         nc->receive_disabled = 1;
 735     }
 736
 737     return ret;
 738 }
 739
 740 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 741                                 const struct iovec *iov, int iovcnt,
 742                                 NetPacketSent *sent_cb)
 743 {
 744     NetQueue *queue;
 745     int ret;
 746
 747     if (sender->link_down || !sender->peer) {
 748         return iov_size(iov, iovcnt);
 749     }
 750
 751     /* Let filters handle the packet first */
 752     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 753                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 754     if (ret) {
 755         return ret;
 756     }
 757
 758     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 759                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 760     if (ret) {
 761         return ret;
 762     }
 763
 764     queue = sender->peer->incoming_queue;
 765
 766     return qemu_net_queue_send_iov(queue, sender,
 767                                    QEMU_NET_PACKET_FLAG_NONE,
 768                                    iov, iovcnt, sent_cb);
 769 }
 770
 771 ssize_t
 772 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 773 {
 774     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 775 }
 776
 777 NetClientState *qemu_find_netdev(const char *id)
 778 {
 779     NetClientState *nc;
 780
 781     QTAILQ_FOREACH(nc, &net_clients, next) {
 782         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 783             continue;
 784         if (!strcmp(nc->name, id)) {
 785             return nc;
 786         }
 787     }
 788
 789     return NULL;
 790 }
 791
 792 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 793                                  NetClientOptionsKind type, int max)
 794 {
 795     NetClientState *nc;
 796     int ret = 0;
 797
 798     QTAILQ_FOREACH(nc, &net_clients, next) {
 799         if (nc->info->type == type) {
 800             continue;
 801         }
 802         if (!id || !strcmp(nc->name, id)) {
 803             if (ret < max) {
 804                 ncs[ret] = nc;
 805             }
 806             ret++;
 807         }
 808     }
 809
 810     return ret;
 811 }
 812
 813 static int nic_get_free_idx(void)
 814 {
 815     int index;
 816
 817     for (index = 0; index < MAX_NICS; index++)
 818         if (!nd_table[index].used)
 819             return index;
 820     return -1;
 821 }
 822
 823 int qemu_show_nic_models(const char *arg, const char *const *models)
 824 {
 825     int i;
 826
 827     if (!arg || !is_help_option(arg)) {
 828         return 0;
 829     }
 830
 831     fprintf(stderr, "qemu: Supported NIC models: ");
 832     for (i = 0 ; models[i]; i++)
 833         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 834     return 1;
 835 }
 836
 837 void qemu_check_nic_model(NICInfo *nd, const char *model)
 838 {
 839     const char *models[2];
 840
 841     models[0] = model;
 842     models[1] = NULL;
 843
 844     if (qemu_show_nic_models(nd->model, models))
 845         exit(0);
 846     if (qemu_find_nic_model(nd, models, model) < 0)
 847         exit(1);
 848 }
 849
 850 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 851                         const char *default_model)
 852 {
 853     int i;
 854
 855     if (!nd->model)
 856         nd->model = g_strdup(default_model);
 857
 858     for (i = 0 ; models[i]; i++) {
 859         if (strcmp(nd->model, models[i]) == 0)
 860             return i;
 861     }
 862
 863     error_report("Unsupported NIC model: %s", nd->model);
 864     return -1;
 865 }
 866
 867 static int net_init_nic(const NetClientOptions *opts, const char *name,
 868                         NetClientState *peer, Error **errp)
 869 {
 870     int idx;
 871     NICInfo *nd;
 872     const NetLegacyNicOptions *nic;
 873
 874     assert(opts->type == NET_CLIENT_OPTIONS_KIND_NIC);
 875     nic = opts->u.nic.data;
 876
 877     idx = nic_get_free_idx();
 878     if (idx == -1 || nb_nics >= MAX_NICS) {
 879         error_setg(errp, "too many NICs");
 880         return -1;
 881     }
 882
 883     nd = &nd_table[idx];
 884
 885     memset(nd, 0, sizeof(*nd));
 886
 887     if (nic->has_netdev) {
 888         nd->netdev = qemu_find_netdev(nic->netdev);
 889         if (!nd->netdev) {
 890             error_setg(errp, "netdev '%s' not found", nic->netdev);
 891             return -1;
 892         }
 893     } else {
 894         assert(peer);
 895         nd->netdev = peer;
 896     }
 897     nd->name = g_strdup(name);
 898     if (nic->has_model) {
 899         nd->model = g_strdup(nic->model);
 900     }
 901     if (nic->has_addr) {
 902         nd->devaddr = g_strdup(nic->addr);
 903     }
 904
 905     if (nic->has_macaddr &&
 906         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 907         error_setg(errp, "invalid syntax for ethernet address");
 908         return -1;
 909     }
 910     if (nic->has_macaddr &&
 911         is_multicast_ether_addr(nd->macaddr.a)) {
 912         error_setg(errp,
 913                    "NIC cannot have multicast MAC address (odd 1st byte)");
 914         return -1;
 915     }
 916     qemu_macaddr_default_if_unset(&nd->macaddr);
 917
 918     if (nic->has_vectors) {
 919         if (nic->vectors > 0x7ffffff) {
 920             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 921             return -1;
 922         }
 923         nd->nvectors = nic->vectors;
 924     } else {
 925         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 926     }
 927
 928     nd->used = 1;
 929     nb_nics++;
 930
 931     return idx;
 932 }
 933
 934
 935 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND__MAX])(
 936     const NetClientOptions *opts,
 937     const char *name,
 938     NetClientState *peer, Error **errp) = {
 939         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 940 #ifdef CONFIG_SLIRP
 941         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 942 #endif
 943         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 944         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 945 #ifdef CONFIG_VDE
 946         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 947 #endif
 948 #ifdef CONFIG_NETMAP
 949         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 950 #endif
 951         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 952 #ifdef CONFIG_NET_BRIDGE
 953         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 954 #endif
 955         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 956 #ifdef CONFIG_VHOST_NET_USED
 957         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 958 #endif
 959 #ifdef CONFIG_L2TPV3
 960         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 961 #endif
 962 };
 963
 964
 965 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 966 {
 967     const NetClientOptions *opts;
 968     const char *name;
 969     NetClientState *peer = NULL;
 970
 971     if (is_netdev) {
 972         const Netdev *netdev = object;
 973         opts = netdev->opts;
 974         name = netdev->id;
 975
 976         if (opts->type == NET_CLIENT_OPTIONS_KIND_DUMP ||
 977             opts->type == NET_CLIENT_OPTIONS_KIND_NIC ||
 978             !net_client_init_fun[opts->type]) {
 979             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 980                        "a netdev backend type");
 981             return -1;
 982         }
 983     } else {
 984         const NetLegacy *net = object;
 985         opts = net->opts;
 986         /* missing optional values have been initialized to "all bits zero" */
 987         name = net->has_id ? net->id : net->name;
 988
 989         if (opts->type == NET_CLIENT_OPTIONS_KIND_NONE) {
 990             return 0; /* nothing to do */
 991         }
 992         if (opts->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 993             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 994                        "a net type");
 995             return -1;
 996         }
 997
 998         if (!net_client_init_fun[opts->type]) {
 999             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1000                        "a net backend type (maybe it is not compiled "
1001                        "into this binary)");
1002             return -1;
1003         }
1004
1005         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1006         if (opts->type != NET_CLIENT_OPTIONS_KIND_NIC ||
1007             !opts->u.nic.data->has_netdev) {
1008             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1009         }
1010     }
1011
1012     if (net_client_init_fun[opts->type](opts, name, peer, errp) < 0) {
1013         /* FIXME drop when all init functions store an Error */
1014         if (errp && !*errp) {
1015             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1016                        NetClientOptionsKind_lookup[opts->type]);
1017         }
1018         return -1;
1019     }
1020     return 0;
1021 }
1022
1023
1024 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
1025 {
1026     void *object = NULL;
1027     Error *err = NULL;
1028     int ret = -1;
1029     OptsVisitor *ov = opts_visitor_new(opts);
1030     Visitor *v = opts_get_visitor(ov);
1031
1032     {
1033         /* Parse convenience option format ip6-net=fec0::0[/64] */
1034         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1035
1036         if (ip6_net) {
1037             char buf[strlen(ip6_net) + 1];
1038
1039             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1040                 /* Default 64bit prefix length.  */
1041                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1042                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1043             } else {
1044                 /* User-specified prefix length.  */
1045                 unsigned long len;
1046                 int err;
1047
1048                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1049                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1050
1051                 if (err) {
1052                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1053                               "ipv6-prefix", "a number");
1054                 } else {
1055                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1056                                         &error_abort);
1057                 }
1058             }
1059             qemu_opt_unset(opts, "ipv6-net");
1060         }
1061     }
1062
1063     if (is_netdev) {
1064         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1065     } else {
1066         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1067     }
1068
1069     if (!err) {
1070         ret = net_client_init1(object, is_netdev, &err);
1071     }
1072
1073     if (is_netdev) {
1074         qapi_free_Netdev(object);
1075     } else {
1076         qapi_free_NetLegacy(object);
1077     }
1078
1079     error_propagate(errp, err);
1080     opts_visitor_cleanup(ov);
1081     return ret;
1082 }
1083
1084
1085 static int net_host_check_device(const char *device)
1086 {
1087     int i;
1088     for (i = 0; host_net_devices[i]; i++) {
1089         if (!strncmp(host_net_devices[i], device,
1090                      strlen(host_net_devices[i]))) {
1091             return 1;
1092         }
1093     }
1094
1095     return 0;
1096 }
1097
1098 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1099 {
1100     const char *device = qdict_get_str(qdict, "device");
1101     const char *opts_str = qdict_get_try_str(qdict, "opts");
1102     Error *local_err = NULL;
1103     QemuOpts *opts;
1104
1105     if (!net_host_check_device(device)) {
1106         monitor_printf(mon, "invalid host network device %s\n", device);
1107         return;
1108     }
1109
1110     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1111                                    opts_str ? opts_str : "", false);
1112     if (!opts) {
1113         return;
1114     }
1115
1116     qemu_opt_set(opts, "type", device, &error_abort);
1117
1118     net_client_init(opts, 0, &local_err);
1119     if (local_err) {
1120         error_report_err(local_err);
1121         monitor_printf(mon, "adding host network device %s failed\n", device);
1122     }
1123 }
1124
1125 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1126 {
1127     NetClientState *nc;
1128     int vlan_id = qdict_get_int(qdict, "vlan_id");
1129     const char *device = qdict_get_str(qdict, "device");
1130
1131     nc = net_hub_find_client_by_name(vlan_id, device);
1132     if (!nc) {
1133         error_report("Host network device '%s' on hub '%d' not found",
1134                      device, vlan_id);
1135         return;
1136     }
1137     if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1138         error_report("invalid host network device '%s'", device);
1139         return;
1140     }
1141
1142     qemu_del_net_client(nc->peer);
1143     qemu_del_net_client(nc);
1144 }
1145
1146 void netdev_add(QemuOpts *opts, Error **errp)
1147 {
1148     net_client_init(opts, 1, errp);
1149 }
1150
1151 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1152 {
1153     Error *local_err = NULL;
1154     QemuOptsList *opts_list;
1155     QemuOpts *opts;
1156
1157     opts_list = qemu_find_opts_err("netdev", &local_err);
1158     if (local_err) {
1159         goto out;
1160     }
1161
1162     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1163     if (local_err) {
1164         goto out;
1165     }
1166
1167     netdev_add(opts, &local_err);
1168     if (local_err) {
1169         qemu_opts_del(opts);
1170         goto out;
1171     }
1172
1173 out:
1174     error_propagate(errp, local_err);
1175 }
1176
1177 void qmp_netdev_del(const char *id, Error **errp)
1178 {
1179     NetClientState *nc;
1180     QemuOpts *opts;
1181
1182     nc = qemu_find_netdev(id);
1183     if (!nc) {
1184         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1185                   "Device '%s' not found", id);
1186         return;
1187     }
1188
1189     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1190     if (!opts) {
1191         error_setg(errp, "Device '%s' is not a netdev", id);
1192         return;
1193     }
1194
1195     qemu_del_net_client(nc);
1196     qemu_opts_del(opts);
1197 }
1198
1199 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1200 {
1201     char *str;
1202     ObjectProperty *prop;
1203     ObjectPropertyIterator iter;
1204     StringOutputVisitor *ov;
1205
1206     /* generate info str */
1207     object_property_iter_init(&iter, OBJECT(nf));
1208     while ((prop = object_property_iter_next(&iter))) {
1209         if (!strcmp(prop->name, "type")) {
1210             continue;
1211         }
1212         ov = string_output_visitor_new(false);
1213         object_property_get(OBJECT(nf), string_output_get_visitor(ov),
1214                             prop->name, NULL);
1215         str = string_output_get_string(ov);
1216         string_output_visitor_cleanup(ov);
1217         monitor_printf(mon, ",%s=%s", prop->name, str);
1218         g_free(str);
1219     }
1220     monitor_printf(mon, "\n");
1221 }
1222
1223 void print_net_client(Monitor *mon, NetClientState *nc)
1224 {
1225     NetFilterState *nf;
1226
1227     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1228                    nc->queue_index,
1229                    NetClientOptionsKind_lookup[nc->info->type],
1230                    nc->info_str);
1231     if (!QTAILQ_EMPTY(&nc->filters)) {
1232         monitor_printf(mon, "filters:\n");
1233     }
1234     QTAILQ_FOREACH(nf, &nc->filters, next) {
1235         char *path = object_get_canonical_path_component(OBJECT(nf));
1236
1237         monitor_printf(mon, "  - %s: type=%s", path,
1238                        object_get_typename(OBJECT(nf)));
1239         netfilter_print_info(mon, nf);
1240         g_free(path);
1241     }
1242 }
1243
1244 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1245                                       Error **errp)
1246 {
1247     NetClientState *nc;
1248     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1249
1250     QTAILQ_FOREACH(nc, &net_clients, next) {
1251         RxFilterInfoList *entry;
1252         RxFilterInfo *info;
1253
1254         if (has_name && strcmp(nc->name, name) != 0) {
1255             continue;
1256         }
1257
1258         /* only query rx-filter information of NIC */
1259         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1260             if (has_name) {
1261                 error_setg(errp, "net client(%s) isn't a NIC", name);
1262                 return NULL;
1263             }
1264             continue;
1265         }
1266
1267         /* only query information on queue 0 since the info is per nic,
1268          * not per queue
1269          */
1270         if (nc->queue_index != 0)
1271             continue;
1272
1273         if (nc->info->query_rx_filter) {
1274             info = nc->info->query_rx_filter(nc);
1275             entry = g_malloc0(sizeof(*entry));
1276             entry->value = info;
1277
1278             if (!filter_list) {
1279                 filter_list = entry;
1280             } else {
1281                 last_entry->next = entry;
1282             }
1283             last_entry = entry;
1284         } else if (has_name) {
1285             error_setg(errp, "net client(%s) doesn't support"
1286                        " rx-filter querying", name);
1287             return NULL;
1288         }
1289
1290         if (has_name) {
1291             break;
1292         }
1293     }
1294
1295     if (filter_list == NULL && has_name) {
1296         error_setg(errp, "invalid net client name: %s", name);
1297     }
1298
1299     return filter_list;
1300 }
1301
1302 void hmp_info_network(Monitor *mon, const QDict *qdict)
1303 {
1304     NetClientState *nc, *peer;
1305     NetClientOptionsKind type;
1306
1307     net_hub_info(mon);
1308
1309     QTAILQ_FOREACH(nc, &net_clients, next) {
1310         peer = nc->peer;
1311         type = nc->info->type;
1312
1313         /* Skip if already printed in hub info */
1314         if (net_hub_id_for_client(nc, NULL) == 0) {
1315             continue;
1316         }
1317
1318         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1319             print_net_client(mon, nc);
1320         } /* else it's a netdev connected to a NIC, printed with the NIC */
1321         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1322             monitor_printf(mon, " \\ ");
1323             print_net_client(mon, peer);
1324         }
1325     }
1326 }
1327
1328 void qmp_set_link(const char *name, bool up, Error **errp)
1329 {
1330     NetClientState *ncs[MAX_QUEUE_NUM];
1331     NetClientState *nc;
1332     int queues, i;
1333
1334     queues = qemu_find_net_clients_except(name, ncs,
1335                                           NET_CLIENT_OPTIONS_KIND__MAX,
1336                                           MAX_QUEUE_NUM);
1337
1338     if (queues == 0) {
1339         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1340                   "Device '%s' not found", name);
1341         return;
1342     }
1343     nc = ncs[0];
1344
1345     for (i = 0; i < queues; i++) {
1346         ncs[i]->link_down = !up;
1347     }
1348
1349     if (nc->info->link_status_changed) {
1350         nc->info->link_status_changed(nc);
1351     }
1352
1353     if (nc->peer) {
1354         /* Change peer link only if the peer is NIC and then notify peer.
1355          * If the peer is a HUBPORT or a backend, we do not change the
1356          * link status.
1357          *
1358          * This behavior is compatible with qemu vlans where there could be
1359          * multiple clients that can still communicate with each other in
1360          * disconnected mode. For now maintain this compatibility.
1361          */
1362         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1363             for (i = 0; i < queues; i++) {
1364                 ncs[i]->peer->link_down = !up;
1365             }
1366         }
1367         if (nc->peer->info->link_status_changed) {
1368             nc->peer->info->link_status_changed(nc->peer);
1369         }
1370     }
1371 }
1372
1373 static void net_vm_change_state_handler(void *opaque, int running,
1374                                         RunState state)
1375 {
1376     NetClientState *nc;
1377     NetClientState *tmp;
1378
1379     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1380         if (running) {
1381             /* Flush queued packets and wake up backends. */
1382             if (nc->peer && qemu_can_send_packet(nc)) {
1383                 qemu_flush_queued_packets(nc->peer);
1384             }
1385         } else {
1386             /* Complete all queued packets, to guarantee we don't modify
1387              * state later when VM is not running.
1388              */
1389             qemu_flush_or_purge_queued_packets(nc, true);
1390         }
1391     }
1392 }
1393
1394 void net_cleanup(void)
1395 {
1396     NetClientState *nc;
1397
1398     /* We may del multiple entries during qemu_del_net_client(),
1399      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1400      */
1401     while (!QTAILQ_EMPTY(&net_clients)) {
1402         nc = QTAILQ_FIRST(&net_clients);
1403         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1404             qemu_del_nic(qemu_get_nic(nc));
1405         } else {
1406             qemu_del_net_client(nc);
1407         }
1408     }
1409
1410     qemu_del_vm_change_state_handler(net_change_state_entry);
1411 }
1412
1413 void net_check_clients(void)
1414 {
1415     NetClientState *nc;
1416     int i;
1417
1418     /* Don't warn about the default network setup that you get if
1419      * no command line -net or -netdev options are specified. There
1420      * are two cases that we would otherwise complain about:
1421      * (1) board doesn't support a NIC but the implicit "-net nic"
1422      * requested one
1423      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1424      * sets up a nic that isn't connected to anything.
1425      */
1426     if (default_net) {
1427         return;
1428     }
1429
1430     net_hub_check_clients();
1431
1432     QTAILQ_FOREACH(nc, &net_clients, next) {
1433         if (!nc->peer) {
1434             fprintf(stderr, "Warning: %s %s has no peer\n",
1435                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1436                     "nic" : "netdev", 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             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1448                     "was not created (not supported by this machine?)\n",
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     Error *local_err = NULL;
1458
1459     net_client_init(opts, 0, &local_err);
1460     if (local_err) {
1461         error_report_err(local_err);
1462         return -1;
1463     }
1464
1465     return 0;
1466 }
1467
1468 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1469 {
1470     Error *local_err = NULL;
1471     int ret;
1472
1473     ret = net_client_init(opts, 1, &local_err);
1474     if (local_err) {
1475         error_report_err(local_err);
1476         return -1;
1477     }
1478
1479     return ret;
1480 }
1481
1482 int net_init_clients(void)
1483 {
1484     QemuOptsList *net = qemu_find_opts("net");
1485
1486     if (default_net) {
1487         /* if no clients, we use a default config */
1488         qemu_opts_set(net, NULL, "type", "nic", &error_abort);
1489 #ifdef CONFIG_SLIRP
1490         qemu_opts_set(net, NULL, "type", "user", &error_abort);
1491 #endif
1492     }
1493
1494     net_change_state_entry =
1495         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1496
1497     QTAILQ_INIT(&net_clients);
1498
1499     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1500                           net_init_netdev, NULL, NULL)) {
1501         return -1;
1502     }
1503
1504     if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1505         return -1;
1506     }
1507
1508     return 0;
1509 }
1510
1511 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1512 {
1513 #if defined(CONFIG_SLIRP)
1514     int ret;
1515     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1516         return ret;
1517     }
1518 #endif
1519
1520     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1521         return -1;
1522     }
1523
1524     default_net = 0;
1525     return 0;
1526 }
1527
1528 /* From FreeBSD */
1529 /* XXX: optimize */
1530 unsigned compute_mcast_idx(const uint8_t *ep)
1531 {
1532     uint32_t crc;
1533     int carry, i, j;
1534     uint8_t b;
1535
1536     crc = 0xffffffff;
1537     for (i = 0; i < 6; i++) {
1538         b = *ep++;
1539         for (j = 0; j < 8; j++) {
1540             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1541             crc <<= 1;
1542             b >>= 1;
1543             if (carry) {
1544                 crc = ((crc ^ POLYNOMIAL) | carry);
1545             }
1546         }
1547     }
1548     return crc >> 26;
1549 }
1550
1551 QemuOptsList qemu_netdev_opts = {
1552     .name = "netdev",
1553     .implied_opt_name = "type",
1554     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1555     .desc = {
1556         /*
1557          * no elements => accept any params
1558          * validation will happen later
1559          */
1560         { /* end of list */ }
1561     },
1562 };
1563
1564 QemuOptsList qemu_net_opts = {
1565     .name = "net",
1566     .implied_opt_name = "type",
1567     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1568     .desc = {
1569         /*
1570          * no elements => accept any params
1571          * validation will happen later
1572          */
1573         { /* end of list */ }
1574     },
1575 };