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     if (nc->info->cleanup) {
 291         nc->info->cleanup(nc);
 292     }
 293 }
 294
 295 static void qemu_free_net_client(NetClientState *nc)
 296 {
 297     if (nc->send_queue) {
 298         qemu_del_net_queue(nc->send_queue);
 299     }
 300     if (nc->peer) {
 301         nc->peer->peer = NULL;
 302     }
 303     g_free(nc->name);
 304     g_free(nc->model);
 305     if (nc->destructor) {
 306         nc->destructor(nc);
 307     }
 308 }
 309
 310 void qemu_del_net_client(NetClientState *nc)
 311 {
 312     NetClientState *ncs[MAX_QUEUE_NUM];
 313     int queues, i;
 314
 315     /* If the NetClientState belongs to a multiqueue backend, we will change all
 316      * other NetClientStates also.
 317      */
 318     queues = qemu_find_net_clients_except(nc->name, ncs,
 319                                           NET_CLIENT_OPTIONS_KIND_NIC,
 320                                           MAX_QUEUE_NUM);
 321     assert(queues != 0);
 322
 323     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 324     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 325         NICState *nic = qemu_get_nic(nc->peer);
 326         if (nic->peer_deleted) {
 327             return;
 328         }
 329         nic->peer_deleted = true;
 330
 331         for (i = 0; i < queues; i++) {
 332             ncs[i]->peer->link_down = true;
 333         }
 334
 335         if (nc->peer->info->link_status_changed) {
 336             nc->peer->info->link_status_changed(nc->peer);
 337         }
 338
 339         for (i = 0; i < queues; i++) {
 340             qemu_cleanup_net_client(ncs[i]);
 341         }
 342
 343         return;
 344     }
 345
 346     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 347
 348     for (i = 0; i < queues; i++) {
 349         qemu_cleanup_net_client(ncs[i]);
 350         qemu_free_net_client(ncs[i]);
 351     }
 352 }
 353
 354 void qemu_del_nic(NICState *nic)
 355 {
 356     int i, queues = MAX(nic->conf->queues, 1);
 357
 358     /* If this is a peer NIC and peer has already been deleted, free it now. */
 359     if (nic->peer_deleted) {
 360         for (i = 0; i < queues; i++) {
 361             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 362         }
 363     }
 364
 365     for (i = queues - 1; i >= 0; i--) {
 366         NetClientState *nc = qemu_get_subqueue(nic, i);
 367
 368         qemu_cleanup_net_client(nc);
 369         qemu_free_net_client(nc);
 370     }
 371 }
 372
 373 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 374 {
 375     NetClientState *nc;
 376
 377     QTAILQ_FOREACH(nc, &net_clients, next) {
 378         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 379             if (nc->queue_index == 0) {
 380                 func(qemu_get_nic(nc), opaque);
 381             }
 382         }
 383     }
 384 }
 385
 386 int qemu_can_send_packet(NetClientState *sender)
 387 {
 388     if (!sender->peer) {
 389         return 1;
 390     }
 391
 392     if (sender->peer->receive_disabled) {
 393         return 0;
 394     } else if (sender->peer->info->can_receive &&
 395                !sender->peer->info->can_receive(sender->peer)) {
 396         return 0;
 397     }
 398     return 1;
 399 }
 400
 401 ssize_t qemu_deliver_packet(NetClientState *sender,
 402                             unsigned flags,
 403                             const uint8_t *data,
 404                             size_t size,
 405                             void *opaque)
 406 {
 407     NetClientState *nc = opaque;
 408     ssize_t ret;
 409
 410     if (nc->link_down) {
 411         return size;
 412     }
 413
 414     if (nc->receive_disabled) {
 415         return 0;
 416     }
 417
 418     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 419         ret = nc->info->receive_raw(nc, data, size);
 420     } else {
 421         ret = nc->info->receive(nc, data, size);
 422     }
 423
 424     if (ret == 0) {
 425         nc->receive_disabled = 1;
 426     };
 427
 428     return ret;
 429 }
 430
 431 void qemu_purge_queued_packets(NetClientState *nc)
 432 {
 433     if (!nc->peer) {
 434         return;
 435     }
 436
 437     qemu_net_queue_purge(nc->peer->send_queue, nc);
 438 }
 439
 440 void qemu_flush_queued_packets(NetClientState *nc)
 441 {
 442     nc->receive_disabled = 0;
 443
 444     if (qemu_net_queue_flush(nc->send_queue)) {
 445         /* We emptied the queue successfully, signal to the IO thread to repoll
 446          * the file descriptor (for tap, for example).
 447          */
 448         qemu_notify_event();
 449     }
 450 }
 451
 452 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 453                                                  unsigned flags,
 454                                                  const uint8_t *buf, int size,
 455                                                  NetPacketSent *sent_cb)
 456 {
 457     NetQueue *queue;
 458
 459 #ifdef DEBUG_NET
 460     printf("qemu_send_packet_async:\n");
 461     hex_dump(stdout, buf, size);
 462 #endif
 463
 464     if (sender->link_down || !sender->peer) {
 465         return size;
 466     }
 467
 468     queue = sender->peer->send_queue;
 469
 470     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 471 }
 472
 473 ssize_t qemu_send_packet_async(NetClientState *sender,
 474                                const uint8_t *buf, int size,
 475                                NetPacketSent *sent_cb)
 476 {
 477     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 478                                              buf, size, sent_cb);
 479 }
 480
 481 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 482 {
 483     qemu_send_packet_async(nc, buf, size, NULL);
 484 }
 485
 486 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 487 {
 488     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 489                                              buf, size, NULL);
 490 }
 491
 492 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 493                                int iovcnt)
 494 {
 495     uint8_t buffer[4096];
 496     size_t offset;
 497
 498     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 499
 500     return nc->info->receive(nc, buffer, offset);
 501 }
 502
 503 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 504                                 unsigned flags,
 505                                 const struct iovec *iov,
 506                                 int iovcnt,
 507                                 void *opaque)
 508 {
 509     NetClientState *nc = opaque;
 510     int ret;
 511
 512     if (nc->link_down) {
 513         return iov_size(iov, iovcnt);
 514     }
 515
 516     if (nc->receive_disabled) {
 517         return 0;
 518     }
 519
 520     if (nc->info->receive_iov) {
 521         ret = nc->info->receive_iov(nc, iov, iovcnt);
 522     } else {
 523         ret = nc_sendv_compat(nc, iov, iovcnt);
 524     }
 525
 526     if (ret == 0) {
 527         nc->receive_disabled = 1;
 528     }
 529
 530     return ret;
 531 }
 532
 533 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 534                                 const struct iovec *iov, int iovcnt,
 535                                 NetPacketSent *sent_cb)
 536 {
 537     NetQueue *queue;
 538
 539     if (sender->link_down || !sender->peer) {
 540         return iov_size(iov, iovcnt);
 541     }
 542
 543     queue = sender->peer->send_queue;
 544
 545     return qemu_net_queue_send_iov(queue, sender,
 546                                    QEMU_NET_PACKET_FLAG_NONE,
 547                                    iov, iovcnt, sent_cb);
 548 }
 549
 550 ssize_t
 551 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 552 {
 553     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 554 }
 555
 556 NetClientState *qemu_find_netdev(const char *id)
 557 {
 558     NetClientState *nc;
 559
 560     QTAILQ_FOREACH(nc, &net_clients, next) {
 561         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 562             continue;
 563         if (!strcmp(nc->name, id)) {
 564             return nc;
 565         }
 566     }
 567
 568     return NULL;
 569 }
 570
 571 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 572                                  NetClientOptionsKind type, int max)
 573 {
 574     NetClientState *nc;
 575     int ret = 0;
 576
 577     QTAILQ_FOREACH(nc, &net_clients, next) {
 578         if (nc->info->type == type) {
 579             continue;
 580         }
 581         if (!strcmp(nc->name, id)) {
 582             if (ret < max) {
 583                 ncs[ret] = nc;
 584             }
 585             ret++;
 586         }
 587     }
 588
 589     return ret;
 590 }
 591
 592 static int nic_get_free_idx(void)
 593 {
 594     int index;
 595
 596     for (index = 0; index < MAX_NICS; index++)
 597         if (!nd_table[index].used)
 598             return index;
 599     return -1;
 600 }
 601
 602 int qemu_show_nic_models(const char *arg, const char *const *models)
 603 {
 604     int i;
 605
 606     if (!arg || !is_help_option(arg)) {
 607         return 0;
 608     }
 609
 610     fprintf(stderr, "qemu: Supported NIC models: ");
 611     for (i = 0 ; models[i]; i++)
 612         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 613     return 1;
 614 }
 615
 616 void qemu_check_nic_model(NICInfo *nd, const char *model)
 617 {
 618     const char *models[2];
 619
 620     models[0] = model;
 621     models[1] = NULL;
 622
 623     if (qemu_show_nic_models(nd->model, models))
 624         exit(0);
 625     if (qemu_find_nic_model(nd, models, model) < 0)
 626         exit(1);
 627 }
 628
 629 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 630                         const char *default_model)
 631 {
 632     int i;
 633
 634     if (!nd->model)
 635         nd->model = g_strdup(default_model);
 636
 637     for (i = 0 ; models[i]; i++) {
 638         if (strcmp(nd->model, models[i]) == 0)
 639             return i;
 640     }
 641
 642     error_report("Unsupported NIC model: %s", nd->model);
 643     return -1;
 644 }
 645
 646 static int net_init_nic(const NetClientOptions *opts, const char *name,
 647                         NetClientState *peer)
 648 {
 649     int idx;
 650     NICInfo *nd;
 651     const NetLegacyNicOptions *nic;
 652
 653     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 654     nic = opts->nic;
 655
 656     idx = nic_get_free_idx();
 657     if (idx == -1 || nb_nics >= MAX_NICS) {
 658         error_report("Too Many NICs");
 659         return -1;
 660     }
 661
 662     nd = &nd_table[idx];
 663
 664     memset(nd, 0, sizeof(*nd));
 665
 666     if (nic->has_netdev) {
 667         nd->netdev = qemu_find_netdev(nic->netdev);
 668         if (!nd->netdev) {
 669             error_report("netdev '%s' not found", nic->netdev);
 670             return -1;
 671         }
 672     } else {
 673         assert(peer);
 674         nd->netdev = peer;
 675     }
 676     nd->name = g_strdup(name);
 677     if (nic->has_model) {
 678         nd->model = g_strdup(nic->model);
 679     }
 680     if (nic->has_addr) {
 681         nd->devaddr = g_strdup(nic->addr);
 682     }
 683
 684     if (nic->has_macaddr &&
 685         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 686         error_report("invalid syntax for ethernet address");
 687         return -1;
 688     }
 689     qemu_macaddr_default_if_unset(&nd->macaddr);
 690
 691     if (nic->has_vectors) {
 692         if (nic->vectors > 0x7ffffff) {
 693             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 694             return -1;
 695         }
 696         nd->nvectors = nic->vectors;
 697     } else {
 698         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 699     }
 700
 701     nd->used = 1;
 702     nb_nics++;
 703
 704     return idx;
 705 }
 706
 707
 708 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 709     const NetClientOptions *opts,
 710     const char *name,
 711     NetClientState *peer) = {
 712         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 713 #ifdef CONFIG_SLIRP
 714         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 715 #endif
 716         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 717         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 718 #ifdef CONFIG_VDE
 719         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 720 #endif
 721         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 722 #ifdef CONFIG_NET_BRIDGE
 723         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 724 #endif
 725         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 726 };
 727
 728
 729 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 730 {
 731     union {
 732         const Netdev    *netdev;
 733         const NetLegacy *net;
 734     } u;
 735     const NetClientOptions *opts;
 736     const char *name;
 737
 738     if (is_netdev) {
 739         u.netdev = object;
 740         opts = u.netdev->opts;
 741         name = u.netdev->id;
 742
 743         switch (opts->kind) {
 744 #ifdef CONFIG_SLIRP
 745         case NET_CLIENT_OPTIONS_KIND_USER:
 746 #endif
 747         case NET_CLIENT_OPTIONS_KIND_TAP:
 748         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 749 #ifdef CONFIG_VDE
 750         case NET_CLIENT_OPTIONS_KIND_VDE:
 751 #endif
 752 #ifdef CONFIG_NET_BRIDGE
 753         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 754 #endif
 755         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 756             break;
 757
 758         default:
 759             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 760                       "a netdev backend type");
 761             return -1;
 762         }
 763     } else {
 764         u.net = object;
 765         opts = u.net->opts;
 766         /* missing optional values have been initialized to "all bits zero" */
 767         name = u.net->has_id ? u.net->id : u.net->name;
 768     }
 769
 770     if (net_client_init_fun[opts->kind]) {
 771         NetClientState *peer = NULL;
 772
 773         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 774          * parameter. */
 775         if (!is_netdev &&
 776             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 777              !opts->nic->has_netdev)) {
 778             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 779         }
 780
 781         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 782             /* TODO push error reporting into init() methods */
 783             error_set(errp, QERR_DEVICE_INIT_FAILED,
 784                       NetClientOptionsKind_lookup[opts->kind]);
 785             return -1;
 786         }
 787     }
 788     return 0;
 789 }
 790
 791
 792 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 793 {
 794     if (is_netdev) {
 795         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 796     } else {
 797         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 798     }
 799 }
 800
 801
 802 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 803 {
 804     void *object = NULL;
 805     Error *err = NULL;
 806     int ret = -1;
 807
 808     {
 809         OptsVisitor *ov = opts_visitor_new(opts);
 810
 811         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 812         opts_visitor_cleanup(ov);
 813     }
 814
 815     if (!err) {
 816         ret = net_client_init1(object, is_netdev, &err);
 817     }
 818
 819     if (object) {
 820         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 821
 822         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 823         qapi_dealloc_visitor_cleanup(dv);
 824     }
 825
 826     error_propagate(errp, err);
 827     return ret;
 828 }
 829
 830
 831 static int net_host_check_device(const char *device)
 832 {
 833     int i;
 834     const char *valid_param_list[] = { "tap", "socket", "dump"
 835 #ifdef CONFIG_NET_BRIDGE
 836                                        , "bridge"
 837 #endif
 838 #ifdef CONFIG_SLIRP
 839                                        ,"user"
 840 #endif
 841 #ifdef CONFIG_VDE
 842                                        ,"vde"
 843 #endif
 844     };
 845     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
 846         if (!strncmp(valid_param_list[i], device,
 847                      strlen(valid_param_list[i])))
 848             return 1;
 849     }
 850
 851     return 0;
 852 }
 853
 854 void net_host_device_add(Monitor *mon, const QDict *qdict)
 855 {
 856     const char *device = qdict_get_str(qdict, "device");
 857     const char *opts_str = qdict_get_try_str(qdict, "opts");
 858     Error *local_err = NULL;
 859     QemuOpts *opts;
 860
 861     if (!net_host_check_device(device)) {
 862         monitor_printf(mon, "invalid host network device %s\n", device);
 863         return;
 864     }
 865
 866     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 867     if (!opts) {
 868         return;
 869     }
 870
 871     qemu_opt_set(opts, "type", device);
 872
 873     net_client_init(opts, 0, &local_err);
 874     if (error_is_set(&local_err)) {
 875         qerror_report_err(local_err);
 876         error_free(local_err);
 877         monitor_printf(mon, "adding host network device %s failed\n", device);
 878     }
 879 }
 880
 881 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 882 {
 883     NetClientState *nc;
 884     int vlan_id = qdict_get_int(qdict, "vlan_id");
 885     const char *device = qdict_get_str(qdict, "device");
 886
 887     nc = net_hub_find_client_by_name(vlan_id, device);
 888     if (!nc) {
 889         return;
 890     }
 891     if (!net_host_check_device(nc->model)) {
 892         monitor_printf(mon, "invalid host network device %s\n", device);
 893         return;
 894     }
 895     qemu_del_net_client(nc);
 896 }
 897
 898 void netdev_add(QemuOpts *opts, Error **errp)
 899 {
 900     net_client_init(opts, 1, errp);
 901 }
 902
 903 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 904 {
 905     Error *local_err = NULL;
 906     QemuOptsList *opts_list;
 907     QemuOpts *opts;
 908
 909     opts_list = qemu_find_opts_err("netdev", &local_err);
 910     if (error_is_set(&local_err)) {
 911         goto exit_err;
 912     }
 913
 914     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
 915     if (error_is_set(&local_err)) {
 916         goto exit_err;
 917     }
 918
 919     netdev_add(opts, &local_err);
 920     if (error_is_set(&local_err)) {
 921         qemu_opts_del(opts);
 922         goto exit_err;
 923     }
 924
 925     return 0;
 926
 927 exit_err:
 928     qerror_report_err(local_err);
 929     error_free(local_err);
 930     return -1;
 931 }
 932
 933 void qmp_netdev_del(const char *id, Error **errp)
 934 {
 935     NetClientState *nc;
 936     QemuOpts *opts;
 937
 938     nc = qemu_find_netdev(id);
 939     if (!nc) {
 940         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
 941         return;
 942     }
 943
 944     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
 945     if (!opts) {
 946         error_setg(errp, "Device '%s' is not a netdev", id);
 947         return;
 948     }
 949
 950     qemu_del_net_client(nc);
 951     qemu_opts_del(opts);
 952 }
 953
 954 void print_net_client(Monitor *mon, NetClientState *nc)
 955 {
 956     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
 957                    nc->queue_index,
 958                    NetClientOptionsKind_lookup[nc->info->type],
 959                    nc->info_str);
 960 }
 961
 962 void do_info_network(Monitor *mon, const QDict *qdict)
 963 {
 964     NetClientState *nc, *peer;
 965     NetClientOptionsKind type;
 966
 967     net_hub_info(mon);
 968
 969     QTAILQ_FOREACH(nc, &net_clients, next) {
 970         peer = nc->peer;
 971         type = nc->info->type;
 972
 973         /* Skip if already printed in hub info */
 974         if (net_hub_id_for_client(nc, NULL) == 0) {
 975             continue;
 976         }
 977
 978         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
 979             print_net_client(mon, nc);
 980         } /* else it's a netdev connected to a NIC, printed with the NIC */
 981         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
 982             monitor_printf(mon, " \\ ");
 983             print_net_client(mon, peer);
 984         }
 985     }
 986 }
 987
 988 void qmp_set_link(const char *name, bool up, Error **errp)
 989 {
 990     NetClientState *ncs[MAX_QUEUE_NUM];
 991     NetClientState *nc;
 992     int queues, i;
 993
 994     queues = qemu_find_net_clients_except(name, ncs,
 995                                           NET_CLIENT_OPTIONS_KIND_MAX,
 996                                           MAX_QUEUE_NUM);
 997
 998     if (queues == 0) {
 999         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
1000         return;
1001     }
1002     nc = ncs[0];
1003
1004     for (i = 0; i < queues; i++) {
1005         ncs[i]->link_down = !up;
1006     }
1007
1008     if (nc->info->link_status_changed) {
1009         nc->info->link_status_changed(nc);
1010     }
1011
1012     /* Notify peer. Don't update peer link status: this makes it possible to
1013      * disconnect from host network without notifying the guest.
1014      * FIXME: is disconnected link status change operation useful?
1015      *
1016      * Current behaviour is compatible with qemu vlans where there could be
1017      * multiple clients that can still communicate with each other in
1018      * disconnected mode. For now maintain this compatibility. */
1019     if (nc->peer && nc->peer->info->link_status_changed) {
1020         nc->peer->info->link_status_changed(nc->peer);
1021     }
1022 }
1023
1024 void net_cleanup(void)
1025 {
1026     NetClientState *nc;
1027
1028     /* We may del multiple entries during qemu_del_net_client(),
1029      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1030      */
1031     while (!QTAILQ_EMPTY(&net_clients)) {
1032         nc = QTAILQ_FIRST(&net_clients);
1033         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1034             qemu_del_nic(qemu_get_nic(nc));
1035         } else {
1036             qemu_del_net_client(nc);
1037         }
1038     }
1039 }
1040
1041 void net_check_clients(void)
1042 {
1043     NetClientState *nc;
1044     int i;
1045
1046     /* Don't warn about the default network setup that you get if
1047      * no command line -net or -netdev options are specified. There
1048      * are two cases that we would otherwise complain about:
1049      * (1) board doesn't support a NIC but the implicit "-net nic"
1050      * requested one
1051      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1052      * sets up a nic that isn't connected to anything.
1053      */
1054     if (default_net) {
1055         return;
1056     }
1057
1058     net_hub_check_clients();
1059
1060     QTAILQ_FOREACH(nc, &net_clients, next) {
1061         if (!nc->peer) {
1062             fprintf(stderr, "Warning: %s %s has no peer\n",
1063                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1064                     "nic" : "netdev", nc->name);
1065         }
1066     }
1067
1068     /* Check that all NICs requested via -net nic actually got created.
1069      * NICs created via -device don't need to be checked here because
1070      * they are always instantiated.
1071      */
1072     for (i = 0; i < MAX_NICS; i++) {
1073         NICInfo *nd = &nd_table[i];
1074         if (nd->used && !nd->instantiated) {
1075             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1076                     "was not created (not supported by this machine?)\n",
1077                     nd->name ? nd->name : "anonymous",
1078                     nd->model ? nd->model : "unspecified");
1079         }
1080     }
1081 }
1082
1083 static int net_init_client(QemuOpts *opts, void *dummy)
1084 {
1085     Error *local_err = NULL;
1086
1087     net_client_init(opts, 0, &local_err);
1088     if (error_is_set(&local_err)) {
1089         qerror_report_err(local_err);
1090         error_free(local_err);
1091         return -1;
1092     }
1093
1094     return 0;
1095 }
1096
1097 static int net_init_netdev(QemuOpts *opts, void *dummy)
1098 {
1099     Error *local_err = NULL;
1100     int ret;
1101
1102     ret = net_client_init(opts, 1, &local_err);
1103     if (error_is_set(&local_err)) {
1104         qerror_report_err(local_err);
1105         error_free(local_err);
1106         return -1;
1107     }
1108
1109     return ret;
1110 }
1111
1112 int net_init_clients(void)
1113 {
1114     QemuOptsList *net = qemu_find_opts("net");
1115
1116     if (default_net) {
1117         /* if no clients, we use a default config */
1118         qemu_opts_set(net, NULL, "type", "nic");
1119 #ifdef CONFIG_SLIRP
1120         qemu_opts_set(net, NULL, "type", "user");
1121 #endif
1122     }
1123
1124     QTAILQ_INIT(&net_clients);
1125
1126     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1127         return -1;
1128
1129     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1130         return -1;
1131     }
1132
1133     return 0;
1134 }
1135
1136 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1137 {
1138 #if defined(CONFIG_SLIRP)
1139     int ret;
1140     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1141         return ret;
1142     }
1143 #endif
1144
1145     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1146         return -1;
1147     }
1148
1149     default_net = 0;
1150     return 0;
1151 }
1152
1153 /* From FreeBSD */
1154 /* XXX: optimize */
1155 unsigned compute_mcast_idx(const uint8_t *ep)
1156 {
1157     uint32_t crc;
1158     int carry, i, j;
1159     uint8_t b;
1160
1161     crc = 0xffffffff;
1162     for (i = 0; i < 6; i++) {
1163         b = *ep++;
1164         for (j = 0; j < 8; j++) {
1165             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1166             crc <<= 1;
1167             b >>= 1;
1168             if (carry) {
1169                 crc = ((crc ^ POLYNOMIAL) | carry);
1170             }
1171         }
1172     }
1173     return crc >> 26;
1174 }
1175
1176 QemuOptsList qemu_netdev_opts = {
1177     .name = "netdev",
1178     .implied_opt_name = "type",
1179     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1180     .desc = {
1181         /*
1182          * no elements => accept any params
1183          * validation will happen later
1184          */
1185         { /* end of list */ }
1186     },
1187 };
1188
1189 QemuOptsList qemu_net_opts = {
1190     .name = "net",
1191     .implied_opt_name = "type",
1192     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1193     .desc = {
1194         /*
1195          * no elements => accept any params
1196          * validation will happen later
1197          */
1198         { /* end of list */ }
1199     },
1200 };