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