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 "config-host.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/sockets.h"
  36 #include "qemu/config-file.h"
  37 #include "qmp-commands.h"
  38 #include "hw/qdev.h"
  39 #include "qemu/iov.h"
  40 #include "qemu/main-loop.h"
  41 #include "qapi-visit.h"
  42 #include "qapi/opts-visitor.h"
  43 #include "qapi/dealloc-visitor.h"
  44 #include "sysemu/sysemu.h"
  45
  46 /* Net bridge is currently not supported for W32. */
  47 #if !defined(_WIN32)
  48 # define CONFIG_NET_BRIDGE
  49 #endif
  50
  51 static QTAILQ_HEAD(, NetClientState) net_clients;
  52
  53 const char *host_net_devices[] = {
  54     "tap",
  55     "socket",
  56     "dump",
  57 #ifdef CONFIG_NET_BRIDGE
  58     "bridge",
  59 #endif
  60 #ifdef CONFIG_SLIRP
  61     "user",
  62 #endif
  63 #ifdef CONFIG_VDE
  64     "vde",
  65 #endif
  66     "vhost-user",
  67     NULL,
  68 };
  69
  70 int default_net = 1;
  71
  72 /***********************************************************/
  73 /* network device redirectors */
  74
  75 #if defined(DEBUG_NET)
  76 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  77 {
  78     int len, i, j, c;
  79
  80     for(i=0;i<size;i+=16) {
  81         len = size - i;
  82         if (len > 16)
  83             len = 16;
  84         fprintf(f, "%08x ", i);
  85         for(j=0;j<16;j++) {
  86             if (j < len)
  87                 fprintf(f, " %02x", buf[i+j]);
  88             else
  89                 fprintf(f, "   ");
  90         }
  91         fprintf(f, " ");
  92         for(j=0;j<len;j++) {
  93             c = buf[i+j];
  94             if (c < ' ' || c > '~')
  95                 c = '.';
  96             fprintf(f, "%c", c);
  97         }
  98         fprintf(f, "\n");
  99     }
 100 }
 101 #endif
 102
 103 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
 104 {
 105     const char *p, *p1;
 106     int len;
 107     p = *pp;
 108     p1 = strchr(p, sep);
 109     if (!p1)
 110         return -1;
 111     len = p1 - p;
 112     p1++;
 113     if (buf_size > 0) {
 114         if (len > buf_size - 1)
 115             len = buf_size - 1;
 116         memcpy(buf, p, len);
 117         buf[len] = '\0';
 118     }
 119     *pp = p1;
 120     return 0;
 121 }
 122
 123 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 124 {
 125     char buf[512];
 126     struct hostent *he;
 127     const char *p, *r;
 128     int port;
 129
 130     p = str;
 131     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 132         return -1;
 133     saddr->sin_family = AF_INET;
 134     if (buf[0] == '\0') {
 135         saddr->sin_addr.s_addr = 0;
 136     } else {
 137         if (qemu_isdigit(buf[0])) {
 138             if (!inet_aton(buf, &saddr->sin_addr))
 139                 return -1;
 140         } else {
 141             if ((he = gethostbyname(buf)) == NULL)
 142                 return - 1;
 143             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 144         }
 145     }
 146     port = strtol(p, (char **)&r, 0);
 147     if (r == p)
 148         return -1;
 149     saddr->sin_port = htons(port);
 150     return 0;
 151 }
 152
 153 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 154 {
 155     snprintf(nc->info_str, sizeof(nc->info_str),
 156              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 157              nc->model,
 158              macaddr[0], macaddr[1], macaddr[2],
 159              macaddr[3], macaddr[4], macaddr[5]);
 160 }
 161
 162 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 163 {
 164     static int index = 0;
 165     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 166
 167     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 168         return;
 169     macaddr->a[0] = 0x52;
 170     macaddr->a[1] = 0x54;
 171     macaddr->a[2] = 0x00;
 172     macaddr->a[3] = 0x12;
 173     macaddr->a[4] = 0x34;
 174     macaddr->a[5] = 0x56 + index++;
 175 }
 176
 177 /**
 178  * Generate a name for net client
 179  *
 180  * Only net clients created with the legacy -net option and NICs need this.
 181  */
 182 static char *assign_name(NetClientState *nc1, const char *model)
 183 {
 184     NetClientState *nc;
 185     int id = 0;
 186
 187     QTAILQ_FOREACH(nc, &net_clients, next) {
 188         if (nc == nc1) {
 189             continue;
 190         }
 191         if (strcmp(nc->model, model) == 0) {
 192             id++;
 193         }
 194     }
 195
 196     return g_strdup_printf("%s.%d", model, id);
 197 }
 198
 199 static void qemu_net_client_destructor(NetClientState *nc)
 200 {
 201     g_free(nc);
 202 }
 203
 204 static void qemu_net_client_setup(NetClientState *nc,
 205                                   NetClientInfo *info,
 206                                   NetClientState *peer,
 207                                   const char *model,
 208                                   const char *name,
 209                                   NetClientDestructor *destructor)
 210 {
 211     nc->info = info;
 212     nc->model = g_strdup(model);
 213     if (name) {
 214         nc->name = g_strdup(name);
 215     } else {
 216         nc->name = assign_name(nc, model);
 217     }
 218
 219     if (peer) {
 220         assert(!peer->peer);
 221         nc->peer = peer;
 222         peer->peer = nc;
 223     }
 224     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 225
 226     nc->incoming_queue = qemu_new_net_queue(nc);
 227     nc->destructor = destructor;
 228 }
 229
 230 NetClientState *qemu_new_net_client(NetClientInfo *info,
 231                                     NetClientState *peer,
 232                                     const char *model,
 233                                     const char *name)
 234 {
 235     NetClientState *nc;
 236
 237     assert(info->size >= sizeof(NetClientState));
 238
 239     nc = g_malloc0(info->size);
 240     qemu_net_client_setup(nc, info, peer, model, name,
 241                           qemu_net_client_destructor);
 242
 243     return nc;
 244 }
 245
 246 NICState *qemu_new_nic(NetClientInfo *info,
 247                        NICConf *conf,
 248                        const char *model,
 249                        const char *name,
 250                        void *opaque)
 251 {
 252     NetClientState **peers = conf->peers.ncs;
 253     NICState *nic;
 254     int i, queues = MAX(1, conf->peers.queues);
 255
 256     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 257     assert(info->size >= sizeof(NICState));
 258
 259     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 260     nic->ncs = (void *)nic + info->size;
 261     nic->conf = conf;
 262     nic->opaque = opaque;
 263
 264     for (i = 0; i < queues; i++) {
 265         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 266                               NULL);
 267         nic->ncs[i].queue_index = i;
 268     }
 269
 270     return nic;
 271 }
 272
 273 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 274 {
 275     return nic->ncs + queue_index;
 276 }
 277
 278 NetClientState *qemu_get_queue(NICState *nic)
 279 {
 280     return qemu_get_subqueue(nic, 0);
 281 }
 282
 283 NICState *qemu_get_nic(NetClientState *nc)
 284 {
 285     NetClientState *nc0 = nc - nc->queue_index;
 286
 287     return (NICState *)((void *)nc0 - nc->info->size);
 288 }
 289
 290 void *qemu_get_nic_opaque(NetClientState *nc)
 291 {
 292     NICState *nic = qemu_get_nic(nc);
 293
 294     return nic->opaque;
 295 }
 296
 297 static void qemu_cleanup_net_client(NetClientState *nc)
 298 {
 299     QTAILQ_REMOVE(&net_clients, nc, next);
 300
 301     if (nc->info->cleanup) {
 302         nc->info->cleanup(nc);
 303     }
 304 }
 305
 306 static void qemu_free_net_client(NetClientState *nc)
 307 {
 308     if (nc->incoming_queue) {
 309         qemu_del_net_queue(nc->incoming_queue);
 310     }
 311     if (nc->peer) {
 312         nc->peer->peer = NULL;
 313     }
 314     g_free(nc->name);
 315     g_free(nc->model);
 316     if (nc->destructor) {
 317         nc->destructor(nc);
 318     }
 319 }
 320
 321 void qemu_del_net_client(NetClientState *nc)
 322 {
 323     NetClientState *ncs[MAX_QUEUE_NUM];
 324     int queues, i;
 325
 326     /* If the NetClientState belongs to a multiqueue backend, we will change all
 327      * other NetClientStates also.
 328      */
 329     queues = qemu_find_net_clients_except(nc->name, ncs,
 330                                           NET_CLIENT_OPTIONS_KIND_NIC,
 331                                           MAX_QUEUE_NUM);
 332     assert(queues != 0);
 333
 334     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 335     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 336         NICState *nic = qemu_get_nic(nc->peer);
 337         if (nic->peer_deleted) {
 338             return;
 339         }
 340         nic->peer_deleted = true;
 341
 342         for (i = 0; i < queues; i++) {
 343             ncs[i]->peer->link_down = true;
 344         }
 345
 346         if (nc->peer->info->link_status_changed) {
 347             nc->peer->info->link_status_changed(nc->peer);
 348         }
 349
 350         for (i = 0; i < queues; i++) {
 351             qemu_cleanup_net_client(ncs[i]);
 352         }
 353
 354         return;
 355     }
 356
 357     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 358
 359     for (i = 0; i < queues; i++) {
 360         qemu_cleanup_net_client(ncs[i]);
 361         qemu_free_net_client(ncs[i]);
 362     }
 363 }
 364
 365 void qemu_del_nic(NICState *nic)
 366 {
 367     int i, queues = MAX(nic->conf->peers.queues, 1);
 368
 369     /* If this is a peer NIC and peer has already been deleted, free it now. */
 370     if (nic->peer_deleted) {
 371         for (i = 0; i < queues; i++) {
 372             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 373         }
 374     }
 375
 376     for (i = queues - 1; i >= 0; i--) {
 377         NetClientState *nc = qemu_get_subqueue(nic, i);
 378
 379         qemu_cleanup_net_client(nc);
 380         qemu_free_net_client(nc);
 381     }
 382
 383     g_free(nic);
 384 }
 385
 386 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 387 {
 388     NetClientState *nc;
 389
 390     QTAILQ_FOREACH(nc, &net_clients, next) {
 391         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 392             if (nc->queue_index == 0) {
 393                 func(qemu_get_nic(nc), opaque);
 394             }
 395         }
 396     }
 397 }
 398
 399 bool qemu_has_ufo(NetClientState *nc)
 400 {
 401     if (!nc || !nc->info->has_ufo) {
 402         return false;
 403     }
 404
 405     return nc->info->has_ufo(nc);
 406 }
 407
 408 bool qemu_has_vnet_hdr(NetClientState *nc)
 409 {
 410     if (!nc || !nc->info->has_vnet_hdr) {
 411         return false;
 412     }
 413
 414     return nc->info->has_vnet_hdr(nc);
 415 }
 416
 417 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 418 {
 419     if (!nc || !nc->info->has_vnet_hdr_len) {
 420         return false;
 421     }
 422
 423     return nc->info->has_vnet_hdr_len(nc, len);
 424 }
 425
 426 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 427 {
 428     if (!nc || !nc->info->using_vnet_hdr) {
 429         return;
 430     }
 431
 432     nc->info->using_vnet_hdr(nc, enable);
 433 }
 434
 435 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 436                           int ecn, int ufo)
 437 {
 438     if (!nc || !nc->info->set_offload) {
 439         return;
 440     }
 441
 442     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 443 }
 444
 445 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 446 {
 447     if (!nc || !nc->info->set_vnet_hdr_len) {
 448         return;
 449     }
 450
 451     nc->info->set_vnet_hdr_len(nc, len);
 452 }
 453
 454 int qemu_can_send_packet(NetClientState *sender)
 455 {
 456     int vm_running = runstate_is_running();
 457
 458     if (!vm_running) {
 459         return 0;
 460     }
 461
 462     if (!sender->peer) {
 463         return 1;
 464     }
 465
 466     if (sender->peer->receive_disabled) {
 467         return 0;
 468     } else if (sender->peer->info->can_receive &&
 469                !sender->peer->info->can_receive(sender->peer)) {
 470         return 0;
 471     }
 472     return 1;
 473 }
 474
 475 ssize_t qemu_deliver_packet(NetClientState *sender,
 476                             unsigned flags,
 477                             const uint8_t *data,
 478                             size_t size,
 479                             void *opaque)
 480 {
 481     NetClientState *nc = opaque;
 482     ssize_t ret;
 483
 484     if (nc->link_down) {
 485         return size;
 486     }
 487
 488     if (nc->receive_disabled) {
 489         return 0;
 490     }
 491
 492     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 493         ret = nc->info->receive_raw(nc, data, size);
 494     } else {
 495         ret = nc->info->receive(nc, data, size);
 496     }
 497
 498     if (ret == 0) {
 499         nc->receive_disabled = 1;
 500     }
 501
 502     return ret;
 503 }
 504
 505 void qemu_purge_queued_packets(NetClientState *nc)
 506 {
 507     if (!nc->peer) {
 508         return;
 509     }
 510
 511     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 512 }
 513
 514 void qemu_flush_queued_packets(NetClientState *nc)
 515 {
 516     nc->receive_disabled = 0;
 517
 518     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 519         if (net_hub_flush(nc->peer)) {
 520             qemu_notify_event();
 521         }
 522     }
 523     if (qemu_net_queue_flush(nc->incoming_queue)) {
 524         /* We emptied the queue successfully, signal to the IO thread to repoll
 525          * the file descriptor (for tap, for example).
 526          */
 527         qemu_notify_event();
 528     }
 529 }
 530
 531 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 532                                                  unsigned flags,
 533                                                  const uint8_t *buf, int size,
 534                                                  NetPacketSent *sent_cb)
 535 {
 536     NetQueue *queue;
 537
 538 #ifdef DEBUG_NET
 539     printf("qemu_send_packet_async:\n");
 540     hex_dump(stdout, buf, size);
 541 #endif
 542
 543     if (sender->link_down || !sender->peer) {
 544         return size;
 545     }
 546
 547     queue = sender->peer->incoming_queue;
 548
 549     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 550 }
 551
 552 ssize_t qemu_send_packet_async(NetClientState *sender,
 553                                const uint8_t *buf, int size,
 554                                NetPacketSent *sent_cb)
 555 {
 556     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 557                                              buf, size, sent_cb);
 558 }
 559
 560 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 561 {
 562     qemu_send_packet_async(nc, buf, size, NULL);
 563 }
 564
 565 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 566 {
 567     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 568                                              buf, size, NULL);
 569 }
 570
 571 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 572                                int iovcnt)
 573 {
 574     uint8_t buffer[NET_BUFSIZE];
 575     size_t offset;
 576
 577     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 578
 579     return nc->info->receive(nc, buffer, offset);
 580 }
 581
 582 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 583                                 unsigned flags,
 584                                 const struct iovec *iov,
 585                                 int iovcnt,
 586                                 void *opaque)
 587 {
 588     NetClientState *nc = opaque;
 589     int ret;
 590
 591     if (nc->link_down) {
 592         return iov_size(iov, iovcnt);
 593     }
 594
 595     if (nc->receive_disabled) {
 596         return 0;
 597     }
 598
 599     if (nc->info->receive_iov) {
 600         ret = nc->info->receive_iov(nc, iov, iovcnt);
 601     } else {
 602         ret = nc_sendv_compat(nc, iov, iovcnt);
 603     }
 604
 605     if (ret == 0) {
 606         nc->receive_disabled = 1;
 607     }
 608
 609     return ret;
 610 }
 611
 612 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 613                                 const struct iovec *iov, int iovcnt,
 614                                 NetPacketSent *sent_cb)
 615 {
 616     NetQueue *queue;
 617
 618     if (sender->link_down || !sender->peer) {
 619         return iov_size(iov, iovcnt);
 620     }
 621
 622     queue = sender->peer->incoming_queue;
 623
 624     return qemu_net_queue_send_iov(queue, sender,
 625                                    QEMU_NET_PACKET_FLAG_NONE,
 626                                    iov, iovcnt, sent_cb);
 627 }
 628
 629 ssize_t
 630 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 631 {
 632     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 633 }
 634
 635 NetClientState *qemu_find_netdev(const char *id)
 636 {
 637     NetClientState *nc;
 638
 639     QTAILQ_FOREACH(nc, &net_clients, next) {
 640         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 641             continue;
 642         if (!strcmp(nc->name, id)) {
 643             return nc;
 644         }
 645     }
 646
 647     return NULL;
 648 }
 649
 650 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 651                                  NetClientOptionsKind type, int max)
 652 {
 653     NetClientState *nc;
 654     int ret = 0;
 655
 656     QTAILQ_FOREACH(nc, &net_clients, next) {
 657         if (nc->info->type == type) {
 658             continue;
 659         }
 660         if (!id || !strcmp(nc->name, id)) {
 661             if (ret < max) {
 662                 ncs[ret] = nc;
 663             }
 664             ret++;
 665         }
 666     }
 667
 668     return ret;
 669 }
 670
 671 static int nic_get_free_idx(void)
 672 {
 673     int index;
 674
 675     for (index = 0; index < MAX_NICS; index++)
 676         if (!nd_table[index].used)
 677             return index;
 678     return -1;
 679 }
 680
 681 int qemu_show_nic_models(const char *arg, const char *const *models)
 682 {
 683     int i;
 684
 685     if (!arg || !is_help_option(arg)) {
 686         return 0;
 687     }
 688
 689     fprintf(stderr, "qemu: Supported NIC models: ");
 690     for (i = 0 ; models[i]; i++)
 691         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 692     return 1;
 693 }
 694
 695 void qemu_check_nic_model(NICInfo *nd, const char *model)
 696 {
 697     const char *models[2];
 698
 699     models[0] = model;
 700     models[1] = NULL;
 701
 702     if (qemu_show_nic_models(nd->model, models))
 703         exit(0);
 704     if (qemu_find_nic_model(nd, models, model) < 0)
 705         exit(1);
 706 }
 707
 708 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 709                         const char *default_model)
 710 {
 711     int i;
 712
 713     if (!nd->model)
 714         nd->model = g_strdup(default_model);
 715
 716     for (i = 0 ; models[i]; i++) {
 717         if (strcmp(nd->model, models[i]) == 0)
 718             return i;
 719     }
 720
 721     error_report("Unsupported NIC model: %s", nd->model);
 722     return -1;
 723 }
 724
 725 static int net_init_nic(const NetClientOptions *opts, const char *name,
 726                         NetClientState *peer)
 727 {
 728     int idx;
 729     NICInfo *nd;
 730     const NetLegacyNicOptions *nic;
 731
 732     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 733     nic = opts->nic;
 734
 735     idx = nic_get_free_idx();
 736     if (idx == -1 || nb_nics >= MAX_NICS) {
 737         error_report("Too Many NICs");
 738         return -1;
 739     }
 740
 741     nd = &nd_table[idx];
 742
 743     memset(nd, 0, sizeof(*nd));
 744
 745     if (nic->has_netdev) {
 746         nd->netdev = qemu_find_netdev(nic->netdev);
 747         if (!nd->netdev) {
 748             error_report("netdev '%s' not found", nic->netdev);
 749             return -1;
 750         }
 751     } else {
 752         assert(peer);
 753         nd->netdev = peer;
 754     }
 755     nd->name = g_strdup(name);
 756     if (nic->has_model) {
 757         nd->model = g_strdup(nic->model);
 758     }
 759     if (nic->has_addr) {
 760         nd->devaddr = g_strdup(nic->addr);
 761     }
 762
 763     if (nic->has_macaddr &&
 764         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 765         error_report("invalid syntax for ethernet address");
 766         return -1;
 767     }
 768     if (nic->has_macaddr &&
 769         is_multicast_ether_addr(nd->macaddr.a)) {
 770         error_report("NIC cannot have multicast MAC address (odd 1st byte)");
 771         return -1;
 772     }
 773     qemu_macaddr_default_if_unset(&nd->macaddr);
 774
 775     if (nic->has_vectors) {
 776         if (nic->vectors > 0x7ffffff) {
 777             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 778             return -1;
 779         }
 780         nd->nvectors = nic->vectors;
 781     } else {
 782         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 783     }
 784
 785     nd->used = 1;
 786     nb_nics++;
 787
 788     return idx;
 789 }
 790
 791
 792 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 793     const NetClientOptions *opts,
 794     const char *name,
 795     NetClientState *peer) = {
 796         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 797 #ifdef CONFIG_SLIRP
 798         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 799 #endif
 800         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 801         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 802 #ifdef CONFIG_VDE
 803         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 804 #endif
 805 #ifdef CONFIG_NETMAP
 806         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 807 #endif
 808         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 809 #ifdef CONFIG_NET_BRIDGE
 810         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 811 #endif
 812         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 813 #ifdef CONFIG_VHOST_NET_USED
 814         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 815 #endif
 816 #ifdef CONFIG_L2TPV3
 817         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 818 #endif
 819 };
 820
 821
 822 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 823 {
 824     union {
 825         const Netdev    *netdev;
 826         const NetLegacy *net;
 827     } u;
 828     const NetClientOptions *opts;
 829     const char *name;
 830
 831     if (is_netdev) {
 832         u.netdev = object;
 833         opts = u.netdev->opts;
 834         name = u.netdev->id;
 835
 836         switch (opts->kind) {
 837 #ifdef CONFIG_SLIRP
 838         case NET_CLIENT_OPTIONS_KIND_USER:
 839 #endif
 840         case NET_CLIENT_OPTIONS_KIND_TAP:
 841         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 842 #ifdef CONFIG_VDE
 843         case NET_CLIENT_OPTIONS_KIND_VDE:
 844 #endif
 845 #ifdef CONFIG_NETMAP
 846         case NET_CLIENT_OPTIONS_KIND_NETMAP:
 847 #endif
 848 #ifdef CONFIG_NET_BRIDGE
 849         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 850 #endif
 851         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 852 #ifdef CONFIG_VHOST_NET_USED
 853         case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
 854 #endif
 855 #ifdef CONFIG_L2TPV3
 856         case NET_CLIENT_OPTIONS_KIND_L2TPV3:
 857 #endif
 858             break;
 859
 860         default:
 861             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 862                       "a netdev backend type");
 863             return -1;
 864         }
 865     } else {
 866         u.net = object;
 867         opts = u.net->opts;
 868         /* missing optional values have been initialized to "all bits zero" */
 869         name = u.net->has_id ? u.net->id : u.net->name;
 870     }
 871
 872     if (net_client_init_fun[opts->kind]) {
 873         NetClientState *peer = NULL;
 874
 875         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 876          * parameter. */
 877         if (!is_netdev &&
 878             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 879              !opts->nic->has_netdev)) {
 880             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 881         }
 882
 883         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 884             /* TODO push error reporting into init() methods */
 885             error_set(errp, QERR_DEVICE_INIT_FAILED,
 886                       NetClientOptionsKind_lookup[opts->kind]);
 887             return -1;
 888         }
 889     }
 890     return 0;
 891 }
 892
 893
 894 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 895 {
 896     if (is_netdev) {
 897         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 898     } else {
 899         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 900     }
 901 }
 902
 903
 904 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 905 {
 906     void *object = NULL;
 907     Error *err = NULL;
 908     int ret = -1;
 909
 910     {
 911         OptsVisitor *ov = opts_visitor_new(opts);
 912
 913         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 914         opts_visitor_cleanup(ov);
 915     }
 916
 917     if (!err) {
 918         ret = net_client_init1(object, is_netdev, &err);
 919     }
 920
 921     if (object) {
 922         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 923
 924         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 925         qapi_dealloc_visitor_cleanup(dv);
 926     }
 927
 928     error_propagate(errp, err);
 929     return ret;
 930 }
 931
 932
 933 static int net_host_check_device(const char *device)
 934 {
 935     int i;
 936     for (i = 0; host_net_devices[i]; i++) {
 937         if (!strncmp(host_net_devices[i], device,
 938                      strlen(host_net_devices[i]))) {
 939             return 1;
 940         }
 941     }
 942
 943     return 0;
 944 }
 945
 946 void net_host_device_add(Monitor *mon, const QDict *qdict)
 947 {
 948     const char *device = qdict_get_str(qdict, "device");
 949     const char *opts_str = qdict_get_try_str(qdict, "opts");
 950     Error *local_err = NULL;
 951     QemuOpts *opts;
 952
 953     if (!net_host_check_device(device)) {
 954         monitor_printf(mon, "invalid host network device %s\n", device);
 955         return;
 956     }
 957
 958     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 959     if (!opts) {
 960         return;
 961     }
 962
 963     qemu_opt_set(opts, "type", device);
 964
 965     net_client_init(opts, 0, &local_err);
 966     if (local_err) {
 967         qerror_report_err(local_err);
 968         error_free(local_err);
 969         monitor_printf(mon, "adding host network device %s failed\n", device);
 970     }
 971 }
 972
 973 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 974 {
 975     NetClientState *nc;
 976     int vlan_id = qdict_get_int(qdict, "vlan_id");
 977     const char *device = qdict_get_str(qdict, "device");
 978
 979     nc = net_hub_find_client_by_name(vlan_id, device);
 980     if (!nc) {
 981         error_report("Host network device '%s' on hub '%d' not found",
 982                      device, vlan_id);
 983         return;
 984     }
 985     if (!net_host_check_device(nc->model)) {
 986         error_report("invalid host network device '%s'", device);
 987         return;
 988     }
 989     qemu_del_net_client(nc);
 990 }
 991
 992 void netdev_add(QemuOpts *opts, Error **errp)
 993 {
 994     net_client_init(opts, 1, errp);
 995 }
 996
 997 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 998 {
 999     Error *local_err = NULL;
1000     QemuOptsList *opts_list;
1001     QemuOpts *opts;
1002
1003     opts_list = qemu_find_opts_err("netdev", &local_err);
1004     if (local_err) {
1005         goto exit_err;
1006     }
1007
1008     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1009     if (local_err) {
1010         goto exit_err;
1011     }
1012
1013     netdev_add(opts, &local_err);
1014     if (local_err) {
1015         qemu_opts_del(opts);
1016         goto exit_err;
1017     }
1018
1019     return 0;
1020
1021 exit_err:
1022     qerror_report_err(local_err);
1023     error_free(local_err);
1024     return -1;
1025 }
1026
1027 void qmp_netdev_del(const char *id, Error **errp)
1028 {
1029     NetClientState *nc;
1030     QemuOpts *opts;
1031
1032     nc = qemu_find_netdev(id);
1033     if (!nc) {
1034         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
1035         return;
1036     }
1037
1038     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1039     if (!opts) {
1040         error_setg(errp, "Device '%s' is not a netdev", id);
1041         return;
1042     }
1043
1044     qemu_del_net_client(nc);
1045     qemu_opts_del(opts);
1046 }
1047
1048 void print_net_client(Monitor *mon, NetClientState *nc)
1049 {
1050     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1051                    nc->queue_index,
1052                    NetClientOptionsKind_lookup[nc->info->type],
1053                    nc->info_str);
1054 }
1055
1056 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1057                                       Error **errp)
1058 {
1059     NetClientState *nc;
1060     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1061
1062     QTAILQ_FOREACH(nc, &net_clients, next) {
1063         RxFilterInfoList *entry;
1064         RxFilterInfo *info;
1065
1066         if (has_name && strcmp(nc->name, name) != 0) {
1067             continue;
1068         }
1069
1070         /* only query rx-filter information of NIC */
1071         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1072             if (has_name) {
1073                 error_setg(errp, "net client(%s) isn't a NIC", name);
1074                 return NULL;
1075             }
1076             continue;
1077         }
1078
1079         if (nc->info->query_rx_filter) {
1080             info = nc->info->query_rx_filter(nc);
1081             entry = g_malloc0(sizeof(*entry));
1082             entry->value = info;
1083
1084             if (!filter_list) {
1085                 filter_list = entry;
1086             } else {
1087                 last_entry->next = entry;
1088             }
1089             last_entry = entry;
1090         } else if (has_name) {
1091             error_setg(errp, "net client(%s) doesn't support"
1092                        " rx-filter querying", name);
1093             return NULL;
1094         }
1095
1096         if (has_name) {
1097             break;
1098         }
1099     }
1100
1101     if (filter_list == NULL && has_name) {
1102         error_setg(errp, "invalid net client name: %s", name);
1103     }
1104
1105     return filter_list;
1106 }
1107
1108 void do_info_network(Monitor *mon, const QDict *qdict)
1109 {
1110     NetClientState *nc, *peer;
1111     NetClientOptionsKind type;
1112
1113     net_hub_info(mon);
1114
1115     QTAILQ_FOREACH(nc, &net_clients, next) {
1116         peer = nc->peer;
1117         type = nc->info->type;
1118
1119         /* Skip if already printed in hub info */
1120         if (net_hub_id_for_client(nc, NULL) == 0) {
1121             continue;
1122         }
1123
1124         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1125             print_net_client(mon, nc);
1126         } /* else it's a netdev connected to a NIC, printed with the NIC */
1127         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1128             monitor_printf(mon, " \\ ");
1129             print_net_client(mon, peer);
1130         }
1131     }
1132 }
1133
1134 void qmp_set_link(const char *name, bool up, Error **errp)
1135 {
1136     NetClientState *ncs[MAX_QUEUE_NUM];
1137     NetClientState *nc;
1138     int queues, i;
1139
1140     queues = qemu_find_net_clients_except(name, ncs,
1141                                           NET_CLIENT_OPTIONS_KIND_MAX,
1142                                           MAX_QUEUE_NUM);
1143
1144     if (queues == 0) {
1145         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
1146         return;
1147     }
1148     nc = ncs[0];
1149
1150     for (i = 0; i < queues; i++) {
1151         ncs[i]->link_down = !up;
1152     }
1153
1154     if (nc->info->link_status_changed) {
1155         nc->info->link_status_changed(nc);
1156     }
1157
1158     if (nc->peer) {
1159         /* Change peer link only if the peer is NIC and then notify peer.
1160          * If the peer is a HUBPORT or a backend, we do not change the
1161          * link status.
1162          *
1163          * This behavior is compatible with qemu vlans where there could be
1164          * multiple clients that can still communicate with each other in
1165          * disconnected mode. For now maintain this compatibility.
1166          */
1167         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1168             for (i = 0; i < queues; i++) {
1169                 ncs[i]->peer->link_down = !up;
1170             }
1171         }
1172         if (nc->peer->info->link_status_changed) {
1173             nc->peer->info->link_status_changed(nc->peer);
1174         }
1175     }
1176 }
1177
1178 void net_cleanup(void)
1179 {
1180     NetClientState *nc;
1181
1182     /* We may del multiple entries during qemu_del_net_client(),
1183      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1184      */
1185     while (!QTAILQ_EMPTY(&net_clients)) {
1186         nc = QTAILQ_FIRST(&net_clients);
1187         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1188             qemu_del_nic(qemu_get_nic(nc));
1189         } else {
1190             qemu_del_net_client(nc);
1191         }
1192     }
1193 }
1194
1195 void net_check_clients(void)
1196 {
1197     NetClientState *nc;
1198     int i;
1199
1200     /* Don't warn about the default network setup that you get if
1201      * no command line -net or -netdev options are specified. There
1202      * are two cases that we would otherwise complain about:
1203      * (1) board doesn't support a NIC but the implicit "-net nic"
1204      * requested one
1205      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1206      * sets up a nic that isn't connected to anything.
1207      */
1208     if (default_net) {
1209         return;
1210     }
1211
1212     net_hub_check_clients();
1213
1214     QTAILQ_FOREACH(nc, &net_clients, next) {
1215         if (!nc->peer) {
1216             fprintf(stderr, "Warning: %s %s has no peer\n",
1217                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1218                     "nic" : "netdev", nc->name);
1219         }
1220     }
1221
1222     /* Check that all NICs requested via -net nic actually got created.
1223      * NICs created via -device don't need to be checked here because
1224      * they are always instantiated.
1225      */
1226     for (i = 0; i < MAX_NICS; i++) {
1227         NICInfo *nd = &nd_table[i];
1228         if (nd->used && !nd->instantiated) {
1229             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1230                     "was not created (not supported by this machine?)\n",
1231                     nd->name ? nd->name : "anonymous",
1232                     nd->model ? nd->model : "unspecified");
1233         }
1234     }
1235 }
1236
1237 static int net_init_client(QemuOpts *opts, void *dummy)
1238 {
1239     Error *local_err = NULL;
1240
1241     net_client_init(opts, 0, &local_err);
1242     if (local_err) {
1243         qerror_report_err(local_err);
1244         error_free(local_err);
1245         return -1;
1246     }
1247
1248     return 0;
1249 }
1250
1251 static int net_init_netdev(QemuOpts *opts, void *dummy)
1252 {
1253     Error *local_err = NULL;
1254     int ret;
1255
1256     ret = net_client_init(opts, 1, &local_err);
1257     if (local_err) {
1258         qerror_report_err(local_err);
1259         error_free(local_err);
1260         return -1;
1261     }
1262
1263     return ret;
1264 }
1265
1266 int net_init_clients(void)
1267 {
1268     QemuOptsList *net = qemu_find_opts("net");
1269
1270     if (default_net) {
1271         /* if no clients, we use a default config */
1272         qemu_opts_set(net, NULL, "type", "nic");
1273 #ifdef CONFIG_SLIRP
1274         qemu_opts_set(net, NULL, "type", "user");
1275 #endif
1276     }
1277
1278     QTAILQ_INIT(&net_clients);
1279
1280     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1281         return -1;
1282
1283     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1284         return -1;
1285     }
1286
1287     return 0;
1288 }
1289
1290 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1291 {
1292 #if defined(CONFIG_SLIRP)
1293     int ret;
1294     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1295         return ret;
1296     }
1297 #endif
1298
1299     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1300         return -1;
1301     }
1302
1303     default_net = 0;
1304     return 0;
1305 }
1306
1307 /* From FreeBSD */
1308 /* XXX: optimize */
1309 unsigned compute_mcast_idx(const uint8_t *ep)
1310 {
1311     uint32_t crc;
1312     int carry, i, j;
1313     uint8_t b;
1314
1315     crc = 0xffffffff;
1316     for (i = 0; i < 6; i++) {
1317         b = *ep++;
1318         for (j = 0; j < 8; j++) {
1319             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1320             crc <<= 1;
1321             b >>= 1;
1322             if (carry) {
1323                 crc = ((crc ^ POLYNOMIAL) | carry);
1324             }
1325         }
1326     }
1327     return crc >> 26;
1328 }
1329
1330 QemuOptsList qemu_netdev_opts = {
1331     .name = "netdev",
1332     .implied_opt_name = "type",
1333     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1334     .desc = {
1335         /*
1336          * no elements => accept any params
1337          * validation will happen later
1338          */
1339         { /* end of list */ }
1340     },
1341 };
1342
1343 QemuOptsList qemu_net_opts = {
1344     .name = "net",
1345     .implied_opt_name = "type",
1346     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1347     .desc = {
1348         /*
1349          * no elements => accept any params
1350          * validation will happen later
1351          */
1352         { /* end of list */ }
1353     },
1354 };