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 (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 445         if (net_hub_flush(nc->peer)) {
 446             qemu_notify_event();
 447         }
 448         return;
 449     }
 450     if (qemu_net_queue_flush(nc->send_queue)) {
 451         /* We emptied the queue successfully, signal to the IO thread to repoll
 452          * the file descriptor (for tap, for example).
 453          */
 454         qemu_notify_event();
 455     }
 456 }
 457
 458 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 459                                                  unsigned flags,
 460                                                  const uint8_t *buf, int size,
 461                                                  NetPacketSent *sent_cb)
 462 {
 463     NetQueue *queue;
 464
 465 #ifdef DEBUG_NET
 466     printf("qemu_send_packet_async:\n");
 467     hex_dump(stdout, buf, size);
 468 #endif
 469
 470     if (sender->link_down || !sender->peer) {
 471         return size;
 472     }
 473
 474     queue = sender->peer->send_queue;
 475
 476     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 477 }
 478
 479 ssize_t qemu_send_packet_async(NetClientState *sender,
 480                                const uint8_t *buf, int size,
 481                                NetPacketSent *sent_cb)
 482 {
 483     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 484                                              buf, size, sent_cb);
 485 }
 486
 487 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 488 {
 489     qemu_send_packet_async(nc, buf, size, NULL);
 490 }
 491
 492 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 493 {
 494     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 495                                              buf, size, NULL);
 496 }
 497
 498 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 499                                int iovcnt)
 500 {
 501     uint8_t buffer[4096];
 502     size_t offset;
 503
 504     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 505
 506     return nc->info->receive(nc, buffer, offset);
 507 }
 508
 509 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 510                                 unsigned flags,
 511                                 const struct iovec *iov,
 512                                 int iovcnt,
 513                                 void *opaque)
 514 {
 515     NetClientState *nc = opaque;
 516     int ret;
 517
 518     if (nc->link_down) {
 519         return iov_size(iov, iovcnt);
 520     }
 521
 522     if (nc->receive_disabled) {
 523         return 0;
 524     }
 525
 526     if (nc->info->receive_iov) {
 527         ret = nc->info->receive_iov(nc, iov, iovcnt);
 528     } else {
 529         ret = nc_sendv_compat(nc, iov, iovcnt);
 530     }
 531
 532     if (ret == 0) {
 533         nc->receive_disabled = 1;
 534     }
 535
 536     return ret;
 537 }
 538
 539 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 540                                 const struct iovec *iov, int iovcnt,
 541                                 NetPacketSent *sent_cb)
 542 {
 543     NetQueue *queue;
 544
 545     if (sender->link_down || !sender->peer) {
 546         return iov_size(iov, iovcnt);
 547     }
 548
 549     queue = sender->peer->send_queue;
 550
 551     return qemu_net_queue_send_iov(queue, sender,
 552                                    QEMU_NET_PACKET_FLAG_NONE,
 553                                    iov, iovcnt, sent_cb);
 554 }
 555
 556 ssize_t
 557 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 558 {
 559     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 560 }
 561
 562 NetClientState *qemu_find_netdev(const char *id)
 563 {
 564     NetClientState *nc;
 565
 566     QTAILQ_FOREACH(nc, &net_clients, next) {
 567         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 568             continue;
 569         if (!strcmp(nc->name, id)) {
 570             return nc;
 571         }
 572     }
 573
 574     return NULL;
 575 }
 576
 577 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 578                                  NetClientOptionsKind type, int max)
 579 {
 580     NetClientState *nc;
 581     int ret = 0;
 582
 583     QTAILQ_FOREACH(nc, &net_clients, next) {
 584         if (nc->info->type == type) {
 585             continue;
 586         }
 587         if (!strcmp(nc->name, id)) {
 588             if (ret < max) {
 589                 ncs[ret] = nc;
 590             }
 591             ret++;
 592         }
 593     }
 594
 595     return ret;
 596 }
 597
 598 static int nic_get_free_idx(void)
 599 {
 600     int index;
 601
 602     for (index = 0; index < MAX_NICS; index++)
 603         if (!nd_table[index].used)
 604             return index;
 605     return -1;
 606 }
 607
 608 int qemu_show_nic_models(const char *arg, const char *const *models)
 609 {
 610     int i;
 611
 612     if (!arg || !is_help_option(arg)) {
 613         return 0;
 614     }
 615
 616     fprintf(stderr, "qemu: Supported NIC models: ");
 617     for (i = 0 ; models[i]; i++)
 618         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 619     return 1;
 620 }
 621
 622 void qemu_check_nic_model(NICInfo *nd, const char *model)
 623 {
 624     const char *models[2];
 625
 626     models[0] = model;
 627     models[1] = NULL;
 628
 629     if (qemu_show_nic_models(nd->model, models))
 630         exit(0);
 631     if (qemu_find_nic_model(nd, models, model) < 0)
 632         exit(1);
 633 }
 634
 635 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 636                         const char *default_model)
 637 {
 638     int i;
 639
 640     if (!nd->model)
 641         nd->model = g_strdup(default_model);
 642
 643     for (i = 0 ; models[i]; i++) {
 644         if (strcmp(nd->model, models[i]) == 0)
 645             return i;
 646     }
 647
 648     error_report("Unsupported NIC model: %s", nd->model);
 649     return -1;
 650 }
 651
 652 static int net_init_nic(const NetClientOptions *opts, const char *name,
 653                         NetClientState *peer)
 654 {
 655     int idx;
 656     NICInfo *nd;
 657     const NetLegacyNicOptions *nic;
 658
 659     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 660     nic = opts->nic;
 661
 662     idx = nic_get_free_idx();
 663     if (idx == -1 || nb_nics >= MAX_NICS) {
 664         error_report("Too Many NICs");
 665         return -1;
 666     }
 667
 668     nd = &nd_table[idx];
 669
 670     memset(nd, 0, sizeof(*nd));
 671
 672     if (nic->has_netdev) {
 673         nd->netdev = qemu_find_netdev(nic->netdev);
 674         if (!nd->netdev) {
 675             error_report("netdev '%s' not found", nic->netdev);
 676             return -1;
 677         }
 678     } else {
 679         assert(peer);
 680         nd->netdev = peer;
 681     }
 682     nd->name = g_strdup(name);
 683     if (nic->has_model) {
 684         nd->model = g_strdup(nic->model);
 685     }
 686     if (nic->has_addr) {
 687         nd->devaddr = g_strdup(nic->addr);
 688     }
 689
 690     if (nic->has_macaddr &&
 691         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 692         error_report("invalid syntax for ethernet address");
 693         return -1;
 694     }
 695     qemu_macaddr_default_if_unset(&nd->macaddr);
 696
 697     if (nic->has_vectors) {
 698         if (nic->vectors > 0x7ffffff) {
 699             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 700             return -1;
 701         }
 702         nd->nvectors = nic->vectors;
 703     } else {
 704         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 705     }
 706
 707     nd->used = 1;
 708     nb_nics++;
 709
 710     return idx;
 711 }
 712
 713
 714 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 715     const NetClientOptions *opts,
 716     const char *name,
 717     NetClientState *peer) = {
 718         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 719 #ifdef CONFIG_SLIRP
 720         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 721 #endif
 722         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 723         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 724 #ifdef CONFIG_VDE
 725         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 726 #endif
 727         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 728 #ifdef CONFIG_NET_BRIDGE
 729         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 730 #endif
 731         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 732 };
 733
 734
 735 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 736 {
 737     union {
 738         const Netdev    *netdev;
 739         const NetLegacy *net;
 740     } u;
 741     const NetClientOptions *opts;
 742     const char *name;
 743
 744     if (is_netdev) {
 745         u.netdev = object;
 746         opts = u.netdev->opts;
 747         name = u.netdev->id;
 748
 749         switch (opts->kind) {
 750 #ifdef CONFIG_SLIRP
 751         case NET_CLIENT_OPTIONS_KIND_USER:
 752 #endif
 753         case NET_CLIENT_OPTIONS_KIND_TAP:
 754         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 755 #ifdef CONFIG_VDE
 756         case NET_CLIENT_OPTIONS_KIND_VDE:
 757 #endif
 758 #ifdef CONFIG_NET_BRIDGE
 759         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 760 #endif
 761         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 762             break;
 763
 764         default:
 765             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 766                       "a netdev backend type");
 767             return -1;
 768         }
 769     } else {
 770         u.net = object;
 771         opts = u.net->opts;
 772         /* missing optional values have been initialized to "all bits zero" */
 773         name = u.net->has_id ? u.net->id : u.net->name;
 774     }
 775
 776     if (net_client_init_fun[opts->kind]) {
 777         NetClientState *peer = NULL;
 778
 779         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 780          * parameter. */
 781         if (!is_netdev &&
 782             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 783              !opts->nic->has_netdev)) {
 784             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 785         }
 786
 787         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 788             /* TODO push error reporting into init() methods */
 789             error_set(errp, QERR_DEVICE_INIT_FAILED,
 790                       NetClientOptionsKind_lookup[opts->kind]);
 791             return -1;
 792         }
 793     }
 794     return 0;
 795 }
 796
 797
 798 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 799 {
 800     if (is_netdev) {
 801         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 802     } else {
 803         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 804     }
 805 }
 806
 807
 808 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 809 {
 810     void *object = NULL;
 811     Error *err = NULL;
 812     int ret = -1;
 813
 814     {
 815         OptsVisitor *ov = opts_visitor_new(opts);
 816
 817         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 818         opts_visitor_cleanup(ov);
 819     }
 820
 821     if (!err) {
 822         ret = net_client_init1(object, is_netdev, &err);
 823     }
 824
 825     if (object) {
 826         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 827
 828         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 829         qapi_dealloc_visitor_cleanup(dv);
 830     }
 831
 832     error_propagate(errp, err);
 833     return ret;
 834 }
 835
 836
 837 static int net_host_check_device(const char *device)
 838 {
 839     int i;
 840     const char *valid_param_list[] = { "tap", "socket", "dump"
 841 #ifdef CONFIG_NET_BRIDGE
 842                                        , "bridge"
 843 #endif
 844 #ifdef CONFIG_SLIRP
 845                                        ,"user"
 846 #endif
 847 #ifdef CONFIG_VDE
 848                                        ,"vde"
 849 #endif
 850     };
 851     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
 852         if (!strncmp(valid_param_list[i], device,
 853                      strlen(valid_param_list[i])))
 854             return 1;
 855     }
 856
 857     return 0;
 858 }
 859
 860 void net_host_device_add(Monitor *mon, const QDict *qdict)
 861 {
 862     const char *device = qdict_get_str(qdict, "device");
 863     const char *opts_str = qdict_get_try_str(qdict, "opts");
 864     Error *local_err = NULL;
 865     QemuOpts *opts;
 866
 867     if (!net_host_check_device(device)) {
 868         monitor_printf(mon, "invalid host network device %s\n", device);
 869         return;
 870     }
 871
 872     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 873     if (!opts) {
 874         return;
 875     }
 876
 877     qemu_opt_set(opts, "type", device);
 878
 879     net_client_init(opts, 0, &local_err);
 880     if (error_is_set(&local_err)) {
 881         qerror_report_err(local_err);
 882         error_free(local_err);
 883         monitor_printf(mon, "adding host network device %s failed\n", device);
 884     }
 885 }
 886
 887 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 888 {
 889     NetClientState *nc;
 890     int vlan_id = qdict_get_int(qdict, "vlan_id");
 891     const char *device = qdict_get_str(qdict, "device");
 892
 893     nc = net_hub_find_client_by_name(vlan_id, device);
 894     if (!nc) {
 895         return;
 896     }
 897     if (!net_host_check_device(nc->model)) {
 898         monitor_printf(mon, "invalid host network device %s\n", device);
 899         return;
 900     }
 901     qemu_del_net_client(nc);
 902 }
 903
 904 void netdev_add(QemuOpts *opts, Error **errp)
 905 {
 906     net_client_init(opts, 1, errp);
 907 }
 908
 909 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 910 {
 911     Error *local_err = NULL;
 912     QemuOptsList *opts_list;
 913     QemuOpts *opts;
 914
 915     opts_list = qemu_find_opts_err("netdev", &local_err);
 916     if (error_is_set(&local_err)) {
 917         goto exit_err;
 918     }
 919
 920     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
 921     if (error_is_set(&local_err)) {
 922         goto exit_err;
 923     }
 924
 925     netdev_add(opts, &local_err);
 926     if (error_is_set(&local_err)) {
 927         qemu_opts_del(opts);
 928         goto exit_err;
 929     }
 930
 931     return 0;
 932
 933 exit_err:
 934     qerror_report_err(local_err);
 935     error_free(local_err);
 936     return -1;
 937 }
 938
 939 void qmp_netdev_del(const char *id, Error **errp)
 940 {
 941     NetClientState *nc;
 942     QemuOpts *opts;
 943
 944     nc = qemu_find_netdev(id);
 945     if (!nc) {
 946         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
 947         return;
 948     }
 949
 950     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
 951     if (!opts) {
 952         error_setg(errp, "Device '%s' is not a netdev", id);
 953         return;
 954     }
 955
 956     qemu_del_net_client(nc);
 957     qemu_opts_del(opts);
 958 }
 959
 960 void print_net_client(Monitor *mon, NetClientState *nc)
 961 {
 962     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
 963                    nc->queue_index,
 964                    NetClientOptionsKind_lookup[nc->info->type],
 965                    nc->info_str);
 966 }
 967
 968 void do_info_network(Monitor *mon, const QDict *qdict)
 969 {
 970     NetClientState *nc, *peer;
 971     NetClientOptionsKind type;
 972
 973     net_hub_info(mon);
 974
 975     QTAILQ_FOREACH(nc, &net_clients, next) {
 976         peer = nc->peer;
 977         type = nc->info->type;
 978
 979         /* Skip if already printed in hub info */
 980         if (net_hub_id_for_client(nc, NULL) == 0) {
 981             continue;
 982         }
 983
 984         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
 985             print_net_client(mon, nc);
 986         } /* else it's a netdev connected to a NIC, printed with the NIC */
 987         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
 988             monitor_printf(mon, " \\ ");
 989             print_net_client(mon, peer);
 990         }
 991     }
 992 }
 993
 994 void qmp_set_link(const char *name, bool up, Error **errp)
 995 {
 996     NetClientState *ncs[MAX_QUEUE_NUM];
 997     NetClientState *nc;
 998     int queues, i;
 999
1000     queues = qemu_find_net_clients_except(name, ncs,
1001                                           NET_CLIENT_OPTIONS_KIND_MAX,
1002                                           MAX_QUEUE_NUM);
1003
1004     if (queues == 0) {
1005         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
1006         return;
1007     }
1008     nc = ncs[0];
1009
1010     for (i = 0; i < queues; i++) {
1011         ncs[i]->link_down = !up;
1012     }
1013
1014     if (nc->info->link_status_changed) {
1015         nc->info->link_status_changed(nc);
1016     }
1017
1018     /* Notify peer. Don't update peer link status: this makes it possible to
1019      * disconnect from host network without notifying the guest.
1020      * FIXME: is disconnected link status change operation useful?
1021      *
1022      * Current behaviour is compatible with qemu vlans where there could be
1023      * multiple clients that can still communicate with each other in
1024      * disconnected mode. For now maintain this compatibility. */
1025     if (nc->peer && nc->peer->info->link_status_changed) {
1026         nc->peer->info->link_status_changed(nc->peer);
1027     }
1028 }
1029
1030 void net_cleanup(void)
1031 {
1032     NetClientState *nc;
1033
1034     /* We may del multiple entries during qemu_del_net_client(),
1035      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1036      */
1037     while (!QTAILQ_EMPTY(&net_clients)) {
1038         nc = QTAILQ_FIRST(&net_clients);
1039         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1040             qemu_del_nic(qemu_get_nic(nc));
1041         } else {
1042             qemu_del_net_client(nc);
1043         }
1044     }
1045 }
1046
1047 void net_check_clients(void)
1048 {
1049     NetClientState *nc;
1050     int i;
1051
1052     /* Don't warn about the default network setup that you get if
1053      * no command line -net or -netdev options are specified. There
1054      * are two cases that we would otherwise complain about:
1055      * (1) board doesn't support a NIC but the implicit "-net nic"
1056      * requested one
1057      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1058      * sets up a nic that isn't connected to anything.
1059      */
1060     if (default_net) {
1061         return;
1062     }
1063
1064     net_hub_check_clients();
1065
1066     QTAILQ_FOREACH(nc, &net_clients, next) {
1067         if (!nc->peer) {
1068             fprintf(stderr, "Warning: %s %s has no peer\n",
1069                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1070                     "nic" : "netdev", nc->name);
1071         }
1072     }
1073
1074     /* Check that all NICs requested via -net nic actually got created.
1075      * NICs created via -device don't need to be checked here because
1076      * they are always instantiated.
1077      */
1078     for (i = 0; i < MAX_NICS; i++) {
1079         NICInfo *nd = &nd_table[i];
1080         if (nd->used && !nd->instantiated) {
1081             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1082                     "was not created (not supported by this machine?)\n",
1083                     nd->name ? nd->name : "anonymous",
1084                     nd->model ? nd->model : "unspecified");
1085         }
1086     }
1087 }
1088
1089 static int net_init_client(QemuOpts *opts, void *dummy)
1090 {
1091     Error *local_err = NULL;
1092
1093     net_client_init(opts, 0, &local_err);
1094     if (error_is_set(&local_err)) {
1095         qerror_report_err(local_err);
1096         error_free(local_err);
1097         return -1;
1098     }
1099
1100     return 0;
1101 }
1102
1103 static int net_init_netdev(QemuOpts *opts, void *dummy)
1104 {
1105     Error *local_err = NULL;
1106     int ret;
1107
1108     ret = net_client_init(opts, 1, &local_err);
1109     if (error_is_set(&local_err)) {
1110         qerror_report_err(local_err);
1111         error_free(local_err);
1112         return -1;
1113     }
1114
1115     return ret;
1116 }
1117
1118 int net_init_clients(void)
1119 {
1120     QemuOptsList *net = qemu_find_opts("net");
1121
1122     if (default_net) {
1123         /* if no clients, we use a default config */
1124         qemu_opts_set(net, NULL, "type", "nic");
1125 #ifdef CONFIG_SLIRP
1126         qemu_opts_set(net, NULL, "type", "user");
1127 #endif
1128     }
1129
1130     QTAILQ_INIT(&net_clients);
1131
1132     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1133         return -1;
1134
1135     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1136         return -1;
1137     }
1138
1139     return 0;
1140 }
1141
1142 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1143 {
1144 #if defined(CONFIG_SLIRP)
1145     int ret;
1146     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1147         return ret;
1148     }
1149 #endif
1150
1151     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1152         return -1;
1153     }
1154
1155     default_net = 0;
1156     return 0;
1157 }
1158
1159 /* From FreeBSD */
1160 /* XXX: optimize */
1161 unsigned compute_mcast_idx(const uint8_t *ep)
1162 {
1163     uint32_t crc;
1164     int carry, i, j;
1165     uint8_t b;
1166
1167     crc = 0xffffffff;
1168     for (i = 0; i < 6; i++) {
1169         b = *ep++;
1170         for (j = 0; j < 8; j++) {
1171             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1172             crc <<= 1;
1173             b >>= 1;
1174             if (carry) {
1175                 crc = ((crc ^ POLYNOMIAL) | carry);
1176             }
1177         }
1178     }
1179     return crc >> 26;
1180 }
1181
1182 QemuOptsList qemu_netdev_opts = {
1183     .name = "netdev",
1184     .implied_opt_name = "type",
1185     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1186     .desc = {
1187         /*
1188          * no elements => accept any params
1189          * validation will happen later
1190          */
1191         { /* end of list */ }
1192     },
1193 };
1194
1195 QemuOptsList qemu_net_opts = {
1196     .name = "net",
1197     .implied_opt_name = "type",
1198     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1199     .desc = {
1200         /*
1201          * no elements => accept any params
1202          * validation will happen later
1203          */
1204         { /* end of list */ }
1205     },
1206 };