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 "util.h"
  31
  32 #include "monitor/monitor.h"
  33 #include "qemu-common.h"
  34 #include "qemu/sockets.h"
  35 #include "qemu/config-file.h"
  36 #include "qmp-commands.h"
  37 #include "hw/qdev.h"
  38 #include "qemu/iov.h"
  39 #include "qapi-visit.h"
  40 #include "qapi/opts-visitor.h"
  41 #include "qapi/dealloc-visitor.h"
  42
  43 /* Net bridge is currently not supported for W32. */
  44 #if !defined(_WIN32)
  45 # define CONFIG_NET_BRIDGE
  46 #endif
  47
  48 static QTAILQ_HEAD(, NetClientState) net_clients;
  49
  50 int default_net = 1;
  51
  52 /***********************************************************/
  53 /* network device redirectors */
  54
  55 #if defined(DEBUG_NET)
  56 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  57 {
  58     int len, i, j, c;
  59
  60     for(i=0;i<size;i+=16) {
  61         len = size - i;
  62         if (len > 16)
  63             len = 16;
  64         fprintf(f, "%08x ", i);
  65         for(j=0;j<16;j++) {
  66             if (j < len)
  67                 fprintf(f, " %02x", buf[i+j]);
  68             else
  69                 fprintf(f, "   ");
  70         }
  71         fprintf(f, " ");
  72         for(j=0;j<len;j++) {
  73             c = buf[i+j];
  74             if (c < ' ' || c > '~')
  75                 c = '.';
  76             fprintf(f, "%c", c);
  77         }
  78         fprintf(f, "\n");
  79     }
  80 }
  81 #endif
  82
  83 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  84 {
  85     const char *p, *p1;
  86     int len;
  87     p = *pp;
  88     p1 = strchr(p, sep);
  89     if (!p1)
  90         return -1;
  91     len = p1 - p;
  92     p1++;
  93     if (buf_size > 0) {
  94         if (len > buf_size - 1)
  95             len = buf_size - 1;
  96         memcpy(buf, p, len);
  97         buf[len] = '\0';
  98     }
  99     *pp = p1;
 100     return 0;
 101 }
 102
 103 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 104 {
 105     char buf[512];
 106     struct hostent *he;
 107     const char *p, *r;
 108     int port;
 109
 110     p = str;
 111     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 112         return -1;
 113     saddr->sin_family = AF_INET;
 114     if (buf[0] == '\0') {
 115         saddr->sin_addr.s_addr = 0;
 116     } else {
 117         if (qemu_isdigit(buf[0])) {
 118             if (!inet_aton(buf, &saddr->sin_addr))
 119                 return -1;
 120         } else {
 121             if ((he = gethostbyname(buf)) == NULL)
 122                 return - 1;
 123             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 124         }
 125     }
 126     port = strtol(p, (char **)&r, 0);
 127     if (r == p)
 128         return -1;
 129     saddr->sin_port = htons(port);
 130     return 0;
 131 }
 132
 133 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 134 {
 135     snprintf(nc->info_str, sizeof(nc->info_str),
 136              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 137              nc->model,
 138              macaddr[0], macaddr[1], macaddr[2],
 139              macaddr[3], macaddr[4], macaddr[5]);
 140 }
 141
 142 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 143 {
 144     static int index = 0;
 145     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 146
 147     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 148         return;
 149     macaddr->a[0] = 0x52;
 150     macaddr->a[1] = 0x54;
 151     macaddr->a[2] = 0x00;
 152     macaddr->a[3] = 0x12;
 153     macaddr->a[4] = 0x34;
 154     macaddr->a[5] = 0x56 + index++;
 155 }
 156
 157 /**
 158  * Generate a name for net client
 159  *
 160  * Only net clients created with the legacy -net option need this.  Naming is
 161  * mandatory for net clients created with -netdev.
 162  */
 163 static char *assign_name(NetClientState *nc1, const char *model)
 164 {
 165     NetClientState *nc;
 166     char buf[256];
 167     int id = 0;
 168
 169     QTAILQ_FOREACH(nc, &net_clients, next) {
 170         if (nc == nc1) {
 171             continue;
 172         }
 173         /* For compatibility only bump id for net clients on a vlan */
 174         if (strcmp(nc->model, model) == 0 &&
 175             net_hub_id_for_client(nc, NULL) == 0) {
 176             id++;
 177         }
 178     }
 179
 180     snprintf(buf, sizeof(buf), "%s.%d", model, id);
 181
 182     return g_strdup(buf);
 183 }
 184
 185 static void qemu_net_client_destructor(NetClientState *nc)
 186 {
 187     g_free(nc);
 188 }
 189
 190 static void qemu_net_client_setup(NetClientState *nc,
 191                                   NetClientInfo *info,
 192                                   NetClientState *peer,
 193                                   const char *model,
 194                                   const char *name,
 195                                   NetClientDestructor *destructor)
 196 {
 197     nc->info = info;
 198     nc->model = g_strdup(model);
 199     if (name) {
 200         nc->name = g_strdup(name);
 201     } else {
 202         nc->name = assign_name(nc, model);
 203     }
 204
 205     if (peer) {
 206         assert(!peer->peer);
 207         nc->peer = peer;
 208         peer->peer = nc;
 209     }
 210     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 211
 212     nc->send_queue = qemu_new_net_queue(nc);
 213     nc->destructor = destructor;
 214 }
 215
 216 NetClientState *qemu_new_net_client(NetClientInfo *info,
 217                                     NetClientState *peer,
 218                                     const char *model,
 219                                     const char *name)
 220 {
 221     NetClientState *nc;
 222
 223     assert(info->size >= sizeof(NetClientState));
 224
 225     nc = g_malloc0(info->size);
 226     qemu_net_client_setup(nc, info, peer, model, name,
 227                           qemu_net_client_destructor);
 228
 229     return nc;
 230 }
 231
 232 NICState *qemu_new_nic(NetClientInfo *info,
 233                        NICConf *conf,
 234                        const char *model,
 235                        const char *name,
 236                        void *opaque)
 237 {
 238     NetClientState **peers = conf->peers.ncs;
 239     NICState *nic;
 240     int i, queues = MAX(1, conf->queues);
 241
 242     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 243     assert(info->size >= sizeof(NICState));
 244
 245     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 246     nic->ncs = (void *)nic + info->size;
 247     nic->conf = conf;
 248     nic->opaque = opaque;
 249
 250     for (i = 0; i < queues; i++) {
 251         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 252                               NULL);
 253         nic->ncs[i].queue_index = i;
 254     }
 255
 256     return nic;
 257 }
 258
 259 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 260 {
 261     return nic->ncs + queue_index;
 262 }
 263
 264 NetClientState *qemu_get_queue(NICState *nic)
 265 {
 266     return qemu_get_subqueue(nic, 0);
 267 }
 268
 269 NICState *qemu_get_nic(NetClientState *nc)
 270 {
 271     NetClientState *nc0 = nc - nc->queue_index;
 272
 273     return (NICState *)((void *)nc0 - nc->info->size);
 274 }
 275
 276 void *qemu_get_nic_opaque(NetClientState *nc)
 277 {
 278     NICState *nic = qemu_get_nic(nc);
 279
 280     return nic->opaque;
 281 }
 282
 283 static void qemu_cleanup_net_client(NetClientState *nc)
 284 {
 285     QTAILQ_REMOVE(&net_clients, nc, next);
 286
 287     if (nc->info->cleanup) {
 288         nc->info->cleanup(nc);
 289     }
 290 }
 291
 292 static void qemu_free_net_client(NetClientState *nc)
 293 {
 294     if (nc->send_queue) {
 295         qemu_del_net_queue(nc->send_queue);
 296     }
 297     if (nc->peer) {
 298         nc->peer->peer = NULL;
 299     }
 300     g_free(nc->name);
 301     g_free(nc->model);
 302     if (nc->destructor) {
 303         nc->destructor(nc);
 304     }
 305 }
 306
 307 void qemu_del_net_client(NetClientState *nc)
 308 {
 309     NetClientState *ncs[MAX_QUEUE_NUM];
 310     int queues, i;
 311
 312     /* If the NetClientState belongs to a multiqueue backend, we will change all
 313      * other NetClientStates also.
 314      */
 315     queues = qemu_find_net_clients_except(nc->name, ncs,
 316                                           NET_CLIENT_OPTIONS_KIND_NIC,
 317                                           MAX_QUEUE_NUM);
 318     assert(queues != 0);
 319
 320     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 321     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 322         NICState *nic = qemu_get_nic(nc->peer);
 323         if (nic->peer_deleted) {
 324             return;
 325         }
 326         nic->peer_deleted = true;
 327
 328         for (i = 0; i < queues; i++) {
 329             ncs[i]->peer->link_down = true;
 330         }
 331
 332         if (nc->peer->info->link_status_changed) {
 333             nc->peer->info->link_status_changed(nc->peer);
 334         }
 335
 336         for (i = 0; i < queues; i++) {
 337             qemu_cleanup_net_client(ncs[i]);
 338         }
 339
 340         return;
 341     }
 342
 343     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 344
 345     for (i = 0; i < queues; i++) {
 346         qemu_cleanup_net_client(ncs[i]);
 347         qemu_free_net_client(ncs[i]);
 348     }
 349 }
 350
 351 void qemu_del_nic(NICState *nic)
 352 {
 353     int i, queues = MAX(nic->conf->queues, 1);
 354
 355     /* If this is a peer NIC and peer has already been deleted, free it now. */
 356     if (nic->peer_deleted) {
 357         for (i = 0; i < queues; i++) {
 358             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 359         }
 360     }
 361
 362     for (i = queues - 1; i >= 0; i--) {
 363         NetClientState *nc = qemu_get_subqueue(nic, i);
 364
 365         qemu_cleanup_net_client(nc);
 366         qemu_free_net_client(nc);
 367     }
 368
 369     g_free(nic);
 370 }
 371
 372 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 373 {
 374     NetClientState *nc;
 375
 376     QTAILQ_FOREACH(nc, &net_clients, next) {
 377         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 378             if (nc->queue_index == 0) {
 379                 func(qemu_get_nic(nc), opaque);
 380             }
 381         }
 382     }
 383 }
 384
 385 int qemu_can_send_packet(NetClientState *sender)
 386 {
 387     if (!sender->peer) {
 388         return 1;
 389     }
 390
 391     if (sender->peer->receive_disabled) {
 392         return 0;
 393     } else if (sender->peer->info->can_receive &&
 394                !sender->peer->info->can_receive(sender->peer)) {
 395         return 0;
 396     }
 397     return 1;
 398 }
 399
 400 ssize_t qemu_deliver_packet(NetClientState *sender,
 401                             unsigned flags,
 402                             const uint8_t *data,
 403                             size_t size,
 404                             void *opaque)
 405 {
 406     NetClientState *nc = opaque;
 407     ssize_t ret;
 408
 409     if (nc->link_down) {
 410         return size;
 411     }
 412
 413     if (nc->receive_disabled) {
 414         return 0;
 415     }
 416
 417     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 418         ret = nc->info->receive_raw(nc, data, size);
 419     } else {
 420         ret = nc->info->receive(nc, data, size);
 421     }
 422
 423     if (ret == 0) {
 424         nc->receive_disabled = 1;
 425     };
 426
 427     return ret;
 428 }
 429
 430 void qemu_purge_queued_packets(NetClientState *nc)
 431 {
 432     if (!nc->peer) {
 433         return;
 434     }
 435
 436     qemu_net_queue_purge(nc->peer->send_queue, nc);
 437 }
 438
 439 void qemu_flush_queued_packets(NetClientState *nc)
 440 {
 441     nc->receive_disabled = 0;
 442
 443     if (qemu_net_queue_flush(nc->send_queue)) {
 444         /* We emptied the queue successfully, signal to the IO thread to repoll
 445          * the file descriptor (for tap, for example).
 446          */
 447         qemu_notify_event();
 448     }
 449 }
 450
 451 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 452                                                  unsigned flags,
 453                                                  const uint8_t *buf, int size,
 454                                                  NetPacketSent *sent_cb)
 455 {
 456     NetQueue *queue;
 457
 458 #ifdef DEBUG_NET
 459     printf("qemu_send_packet_async:\n");
 460     hex_dump(stdout, buf, size);
 461 #endif
 462
 463     if (sender->link_down || !sender->peer) {
 464         return size;
 465     }
 466
 467     queue = sender->peer->send_queue;
 468
 469     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 470 }
 471
 472 ssize_t qemu_send_packet_async(NetClientState *sender,
 473                                const uint8_t *buf, int size,
 474                                NetPacketSent *sent_cb)
 475 {
 476     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 477                                              buf, size, sent_cb);
 478 }
 479
 480 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 481 {
 482     qemu_send_packet_async(nc, buf, size, NULL);
 483 }
 484
 485 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 486 {
 487     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 488                                              buf, size, NULL);
 489 }
 490
 491 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 492                                int iovcnt)
 493 {
 494     uint8_t buffer[4096];
 495     size_t offset;
 496
 497     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 498
 499     return nc->info->receive(nc, buffer, offset);
 500 }
 501
 502 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 503                                 unsigned flags,
 504                                 const struct iovec *iov,
 505                                 int iovcnt,
 506                                 void *opaque)
 507 {
 508     NetClientState *nc = opaque;
 509     int ret;
 510
 511     if (nc->link_down) {
 512         return iov_size(iov, iovcnt);
 513     }
 514
 515     if (nc->receive_disabled) {
 516         return 0;
 517     }
 518
 519     if (nc->info->receive_iov) {
 520         ret = nc->info->receive_iov(nc, iov, iovcnt);
 521     } else {
 522         ret = nc_sendv_compat(nc, iov, iovcnt);
 523     }
 524
 525     if (ret == 0) {
 526         nc->receive_disabled = 1;
 527     }
 528
 529     return ret;
 530 }
 531
 532 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 533                                 const struct iovec *iov, int iovcnt,
 534                                 NetPacketSent *sent_cb)
 535 {
 536     NetQueue *queue;
 537
 538     if (sender->link_down || !sender->peer) {
 539         return iov_size(iov, iovcnt);
 540     }
 541
 542     queue = sender->peer->send_queue;
 543
 544     return qemu_net_queue_send_iov(queue, sender,
 545                                    QEMU_NET_PACKET_FLAG_NONE,
 546                                    iov, iovcnt, sent_cb);
 547 }
 548
 549 ssize_t
 550 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 551 {
 552     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 553 }
 554
 555 NetClientState *qemu_find_netdev(const char *id)
 556 {
 557     NetClientState *nc;
 558
 559     QTAILQ_FOREACH(nc, &net_clients, next) {
 560         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 561             continue;
 562         if (!strcmp(nc->name, id)) {
 563             return nc;
 564         }
 565     }
 566
 567     return NULL;
 568 }
 569
 570 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 571                                  NetClientOptionsKind type, int max)
 572 {
 573     NetClientState *nc;
 574     int ret = 0;
 575
 576     QTAILQ_FOREACH(nc, &net_clients, next) {
 577         if (nc->info->type == type) {
 578             continue;
 579         }
 580         if (!strcmp(nc->name, id)) {
 581             if (ret < max) {
 582                 ncs[ret] = nc;
 583             }
 584             ret++;
 585         }
 586     }
 587
 588     return ret;
 589 }
 590
 591 static int nic_get_free_idx(void)
 592 {
 593     int index;
 594
 595     for (index = 0; index < MAX_NICS; index++)
 596         if (!nd_table[index].used)
 597             return index;
 598     return -1;
 599 }
 600
 601 int qemu_show_nic_models(const char *arg, const char *const *models)
 602 {
 603     int i;
 604
 605     if (!arg || !is_help_option(arg)) {
 606         return 0;
 607     }
 608
 609     fprintf(stderr, "qemu: Supported NIC models: ");
 610     for (i = 0 ; models[i]; i++)
 611         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 612     return 1;
 613 }
 614
 615 void qemu_check_nic_model(NICInfo *nd, const char *model)
 616 {
 617     const char *models[2];
 618
 619     models[0] = model;
 620     models[1] = NULL;
 621
 622     if (qemu_show_nic_models(nd->model, models))
 623         exit(0);
 624     if (qemu_find_nic_model(nd, models, model) < 0)
 625         exit(1);
 626 }
 627
 628 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 629                         const char *default_model)
 630 {
 631     int i;
 632
 633     if (!nd->model)
 634         nd->model = g_strdup(default_model);
 635
 636     for (i = 0 ; models[i]; i++) {
 637         if (strcmp(nd->model, models[i]) == 0)
 638             return i;
 639     }
 640
 641     error_report("Unsupported NIC model: %s", nd->model);
 642     return -1;
 643 }
 644
 645 static int net_init_nic(const NetClientOptions *opts, const char *name,
 646                         NetClientState *peer)
 647 {
 648     int idx;
 649     NICInfo *nd;
 650     const NetLegacyNicOptions *nic;
 651
 652     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 653     nic = opts->nic;
 654
 655     idx = nic_get_free_idx();
 656     if (idx == -1 || nb_nics >= MAX_NICS) {
 657         error_report("Too Many NICs");
 658         return -1;
 659     }
 660
 661     nd = &nd_table[idx];
 662
 663     memset(nd, 0, sizeof(*nd));
 664
 665     if (nic->has_netdev) {
 666         nd->netdev = qemu_find_netdev(nic->netdev);
 667         if (!nd->netdev) {
 668             error_report("netdev '%s' not found", nic->netdev);
 669             return -1;
 670         }
 671     } else {
 672         assert(peer);
 673         nd->netdev = peer;
 674     }
 675     nd->name = g_strdup(name);
 676     if (nic->has_model) {
 677         nd->model = g_strdup(nic->model);
 678     }
 679     if (nic->has_addr) {
 680         nd->devaddr = g_strdup(nic->addr);
 681     }
 682
 683     if (nic->has_macaddr &&
 684         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 685         error_report("invalid syntax for ethernet address");
 686         return -1;
 687     }
 688     qemu_macaddr_default_if_unset(&nd->macaddr);
 689
 690     if (nic->has_vectors) {
 691         if (nic->vectors > 0x7ffffff) {
 692             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 693             return -1;
 694         }
 695         nd->nvectors = nic->vectors;
 696     } else {
 697         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 698     }
 699
 700     nd->used = 1;
 701     nb_nics++;
 702
 703     return idx;
 704 }
 705
 706
 707 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 708     const NetClientOptions *opts,
 709     const char *name,
 710     NetClientState *peer) = {
 711         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 712 #ifdef CONFIG_SLIRP
 713         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 714 #endif
 715         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 716         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 717 #ifdef CONFIG_VDE
 718         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 719 #endif
 720         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 721 #ifdef CONFIG_NET_BRIDGE
 722         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 723 #endif
 724         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 725 };
 726
 727
 728 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 729 {
 730     union {
 731         const Netdev    *netdev;
 732         const NetLegacy *net;
 733     } u;
 734     const NetClientOptions *opts;
 735     const char *name;
 736
 737     if (is_netdev) {
 738         u.netdev = object;
 739         opts = u.netdev->opts;
 740         name = u.netdev->id;
 741
 742         switch (opts->kind) {
 743 #ifdef CONFIG_SLIRP
 744         case NET_CLIENT_OPTIONS_KIND_USER:
 745 #endif
 746         case NET_CLIENT_OPTIONS_KIND_TAP:
 747         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 748 #ifdef CONFIG_VDE
 749         case NET_CLIENT_OPTIONS_KIND_VDE:
 750 #endif
 751 #ifdef CONFIG_NET_BRIDGE
 752         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 753 #endif
 754         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 755             break;
 756
 757         default:
 758             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 759                       "a netdev backend type");
 760             return -1;
 761         }
 762     } else {
 763         u.net = object;
 764         opts = u.net->opts;
 765         /* missing optional values have been initialized to "all bits zero" */
 766         name = u.net->has_id ? u.net->id : u.net->name;
 767     }
 768
 769     if (net_client_init_fun[opts->kind]) {
 770         NetClientState *peer = NULL;
 771
 772         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 773          * parameter. */
 774         if (!is_netdev &&
 775             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 776              !opts->nic->has_netdev)) {
 777             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 778         }
 779
 780         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 781             /* TODO push error reporting into init() methods */
 782             error_set(errp, QERR_DEVICE_INIT_FAILED,
 783                       NetClientOptionsKind_lookup[opts->kind]);
 784             return -1;
 785         }
 786     }
 787     return 0;
 788 }
 789
 790
 791 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 792 {
 793     if (is_netdev) {
 794         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 795     } else {
 796         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 797     }
 798 }
 799
 800
 801 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 802 {
 803     void *object = NULL;
 804     Error *err = NULL;
 805     int ret = -1;
 806
 807     {
 808         OptsVisitor *ov = opts_visitor_new(opts);
 809
 810         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 811         opts_visitor_cleanup(ov);
 812     }
 813
 814     if (!err) {
 815         ret = net_client_init1(object, is_netdev, &err);
 816     }
 817
 818     if (object) {
 819         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 820
 821         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 822         qapi_dealloc_visitor_cleanup(dv);
 823     }
 824
 825     error_propagate(errp, err);
 826     return ret;
 827 }
 828
 829
 830 static int net_host_check_device(const char *device)
 831 {
 832     int i;
 833     const char *valid_param_list[] = { "tap", "socket", "dump"
 834 #ifdef CONFIG_NET_BRIDGE
 835                                        , "bridge"
 836 #endif
 837 #ifdef CONFIG_SLIRP
 838                                        ,"user"
 839 #endif
 840 #ifdef CONFIG_VDE
 841                                        ,"vde"
 842 #endif
 843     };
 844     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
 845         if (!strncmp(valid_param_list[i], device,
 846                      strlen(valid_param_list[i])))
 847             return 1;
 848     }
 849
 850     return 0;
 851 }
 852
 853 void net_host_device_add(Monitor *mon, const QDict *qdict)
 854 {
 855     const char *device = qdict_get_str(qdict, "device");
 856     const char *opts_str = qdict_get_try_str(qdict, "opts");
 857     Error *local_err = NULL;
 858     QemuOpts *opts;
 859
 860     if (!net_host_check_device(device)) {
 861         monitor_printf(mon, "invalid host network device %s\n", device);
 862         return;
 863     }
 864
 865     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 866     if (!opts) {
 867         return;
 868     }
 869
 870     qemu_opt_set(opts, "type", device);
 871
 872     net_client_init(opts, 0, &local_err);
 873     if (error_is_set(&local_err)) {
 874         qerror_report_err(local_err);
 875         error_free(local_err);
 876         monitor_printf(mon, "adding host network device %s failed\n", device);
 877     }
 878 }
 879
 880 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 881 {
 882     NetClientState *nc;
 883     int vlan_id = qdict_get_int(qdict, "vlan_id");
 884     const char *device = qdict_get_str(qdict, "device");
 885
 886     nc = net_hub_find_client_by_name(vlan_id, device);
 887     if (!nc) {
 888         return;
 889     }
 890     if (!net_host_check_device(nc->model)) {
 891         monitor_printf(mon, "invalid host network device %s\n", device);
 892         return;
 893     }
 894     qemu_del_net_client(nc);
 895 }
 896
 897 void netdev_add(QemuOpts *opts, Error **errp)
 898 {
 899     net_client_init(opts, 1, errp);
 900 }
 901
 902 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 903 {
 904     Error *local_err = NULL;
 905     QemuOptsList *opts_list;
 906     QemuOpts *opts;
 907
 908     opts_list = qemu_find_opts_err("netdev", &local_err);
 909     if (error_is_set(&local_err)) {
 910         goto exit_err;
 911     }
 912
 913     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
 914     if (error_is_set(&local_err)) {
 915         goto exit_err;
 916     }
 917
 918     netdev_add(opts, &local_err);
 919     if (error_is_set(&local_err)) {
 920         qemu_opts_del(opts);
 921         goto exit_err;
 922     }
 923
 924     return 0;
 925
 926 exit_err:
 927     qerror_report_err(local_err);
 928     error_free(local_err);
 929     return -1;
 930 }
 931
 932 void qmp_netdev_del(const char *id, Error **errp)
 933 {
 934     NetClientState *nc;
 935     QemuOpts *opts;
 936
 937     nc = qemu_find_netdev(id);
 938     if (!nc) {
 939         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
 940         return;
 941     }
 942
 943     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
 944     if (!opts) {
 945         error_setg(errp, "Device '%s' is not a netdev", id);
 946         return;
 947     }
 948
 949     qemu_del_net_client(nc);
 950     qemu_opts_del(opts);
 951 }
 952
 953 void print_net_client(Monitor *mon, NetClientState *nc)
 954 {
 955     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
 956                    nc->queue_index,
 957                    NetClientOptionsKind_lookup[nc->info->type],
 958                    nc->info_str);
 959 }
 960
 961 void do_info_network(Monitor *mon, const QDict *qdict)
 962 {
 963     NetClientState *nc, *peer;
 964     NetClientOptionsKind type;
 965
 966     net_hub_info(mon);
 967
 968     QTAILQ_FOREACH(nc, &net_clients, next) {
 969         peer = nc->peer;
 970         type = nc->info->type;
 971
 972         /* Skip if already printed in hub info */
 973         if (net_hub_id_for_client(nc, NULL) == 0) {
 974             continue;
 975         }
 976
 977         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
 978             print_net_client(mon, nc);
 979         } /* else it's a netdev connected to a NIC, printed with the NIC */
 980         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
 981             monitor_printf(mon, " \\ ");
 982             print_net_client(mon, peer);
 983         }
 984     }
 985 }
 986
 987 void qmp_set_link(const char *name, bool up, Error **errp)
 988 {
 989     NetClientState *ncs[MAX_QUEUE_NUM];
 990     NetClientState *nc;
 991     int queues, i;
 992
 993     queues = qemu_find_net_clients_except(name, ncs,
 994                                           NET_CLIENT_OPTIONS_KIND_MAX,
 995                                           MAX_QUEUE_NUM);
 996
 997     if (queues == 0) {
 998         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
 999         return;
1000     }
1001     nc = ncs[0];
1002
1003     for (i = 0; i < queues; i++) {
1004         ncs[i]->link_down = !up;
1005     }
1006
1007     if (nc->info->link_status_changed) {
1008         nc->info->link_status_changed(nc);
1009     }
1010
1011     /* Notify peer. Don't update peer link status: this makes it possible to
1012      * disconnect from host network without notifying the guest.
1013      * FIXME: is disconnected link status change operation useful?
1014      *
1015      * Current behaviour is compatible with qemu vlans where there could be
1016      * multiple clients that can still communicate with each other in
1017      * disconnected mode. For now maintain this compatibility. */
1018     if (nc->peer && nc->peer->info->link_status_changed) {
1019         nc->peer->info->link_status_changed(nc->peer);
1020     }
1021 }
1022
1023 void net_cleanup(void)
1024 {
1025     NetClientState *nc;
1026
1027     /* We may del multiple entries during qemu_del_net_client(),
1028      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1029      */
1030     while (!QTAILQ_EMPTY(&net_clients)) {
1031         nc = QTAILQ_FIRST(&net_clients);
1032         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1033             qemu_del_nic(qemu_get_nic(nc));
1034         } else {
1035             qemu_del_net_client(nc);
1036         }
1037     }
1038 }
1039
1040 void net_check_clients(void)
1041 {
1042     NetClientState *nc;
1043     int i;
1044
1045     /* Don't warn about the default network setup that you get if
1046      * no command line -net or -netdev options are specified. There
1047      * are two cases that we would otherwise complain about:
1048      * (1) board doesn't support a NIC but the implicit "-net nic"
1049      * requested one
1050      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1051      * sets up a nic that isn't connected to anything.
1052      */
1053     if (default_net) {
1054         return;
1055     }
1056
1057     net_hub_check_clients();
1058
1059     QTAILQ_FOREACH(nc, &net_clients, next) {
1060         if (!nc->peer) {
1061             fprintf(stderr, "Warning: %s %s has no peer\n",
1062                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1063                     "nic" : "netdev", nc->name);
1064         }
1065     }
1066
1067     /* Check that all NICs requested via -net nic actually got created.
1068      * NICs created via -device don't need to be checked here because
1069      * they are always instantiated.
1070      */
1071     for (i = 0; i < MAX_NICS; i++) {
1072         NICInfo *nd = &nd_table[i];
1073         if (nd->used && !nd->instantiated) {
1074             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1075                     "was not created (not supported by this machine?)\n",
1076                     nd->name ? nd->name : "anonymous",
1077                     nd->model ? nd->model : "unspecified");
1078         }
1079     }
1080 }
1081
1082 static int net_init_client(QemuOpts *opts, void *dummy)
1083 {
1084     Error *local_err = NULL;
1085
1086     net_client_init(opts, 0, &local_err);
1087     if (error_is_set(&local_err)) {
1088         qerror_report_err(local_err);
1089         error_free(local_err);
1090         return -1;
1091     }
1092
1093     return 0;
1094 }
1095
1096 static int net_init_netdev(QemuOpts *opts, void *dummy)
1097 {
1098     Error *local_err = NULL;
1099     int ret;
1100
1101     ret = net_client_init(opts, 1, &local_err);
1102     if (error_is_set(&local_err)) {
1103         qerror_report_err(local_err);
1104         error_free(local_err);
1105         return -1;
1106     }
1107
1108     return ret;
1109 }
1110
1111 int net_init_clients(void)
1112 {
1113     QemuOptsList *net = qemu_find_opts("net");
1114
1115     if (default_net) {
1116         /* if no clients, we use a default config */
1117         qemu_opts_set(net, NULL, "type", "nic");
1118 #ifdef CONFIG_SLIRP
1119         qemu_opts_set(net, NULL, "type", "user");
1120 #endif
1121     }
1122
1123     QTAILQ_INIT(&net_clients);
1124
1125     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1126         return -1;
1127
1128     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1129         return -1;
1130     }
1131
1132     return 0;
1133 }
1134
1135 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1136 {
1137 #if defined(CONFIG_SLIRP)
1138     int ret;
1139     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1140         return ret;
1141     }
1142 #endif
1143
1144     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1145         return -1;
1146     }
1147
1148     default_net = 0;
1149     return 0;
1150 }
1151
1152 /* From FreeBSD */
1153 /* XXX: optimize */
1154 unsigned compute_mcast_idx(const uint8_t *ep)
1155 {
1156     uint32_t crc;
1157     int carry, i, j;
1158     uint8_t b;
1159
1160     crc = 0xffffffff;
1161     for (i = 0; i < 6; i++) {
1162         b = *ep++;
1163         for (j = 0; j < 8; j++) {
1164             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1165             crc <<= 1;
1166             b >>= 1;
1167             if (carry) {
1168                 crc = ((crc ^ POLYNOMIAL) | carry);
1169             }
1170         }
1171     }
1172     return crc >> 26;
1173 }
1174
1175 QemuOptsList qemu_netdev_opts = {
1176     .name = "netdev",
1177     .implied_opt_name = "type",
1178     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1179     .desc = {
1180         /*
1181          * no elements => accept any params
1182          * validation will happen later
1183          */
1184         { /* end of list */ }
1185     },
1186 };
1187
1188 QemuOptsList qemu_net_opts = {
1189     .name = "net",
1190     .implied_opt_name = "type",
1191     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1192     .desc = {
1193         /*
1194          * no elements => accept any params
1195          * validation will happen later
1196          */
1197         { /* end of list */ }
1198     },
1199 };