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