net/net.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "config-host.h"
  25
  26 #include "net/net.h"
  27 #include "clients.h"
  28 #include "hub.h"
  29 #include "net/slirp.h"
  30 #include "net/eth.h"
  31 #include "util.h"
  32
  33 #include "monitor/monitor.h"
  34 #include "qemu-common.h"
  35 #include "qemu/sockets.h"
  36 #include "qemu/config-file.h"
  37 #include "qmp-commands.h"
  38 #include "hw/qdev.h"
  39 #include "qemu/iov.h"
  40 #include "qemu/main-loop.h"
  41 #include "qapi-visit.h"
  42 #include "qapi/opts-visitor.h"
  43 #include "qapi/dealloc-visitor.h"
  44
  45 /* Net bridge is currently not supported for W32. */
  46 #if !defined(_WIN32)
  47 # define CONFIG_NET_BRIDGE
  48 #endif
  49
  50 static QTAILQ_HEAD(, NetClientState) net_clients;
  51
  52 int default_net = 1;
  53
  54 /***********************************************************/
  55 /* network device redirectors */
  56
  57 #if defined(DEBUG_NET)
  58 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  59 {
  60     int len, i, j, c;
  61
  62     for(i=0;i<size;i+=16) {
  63         len = size - i;
  64         if (len > 16)
  65             len = 16;
  66         fprintf(f, "%08x ", i);
  67         for(j=0;j<16;j++) {
  68             if (j < len)
  69                 fprintf(f, " %02x", buf[i+j]);
  70             else
  71                 fprintf(f, "   ");
  72         }
  73         fprintf(f, " ");
  74         for(j=0;j<len;j++) {
  75             c = buf[i+j];
  76             if (c < ' ' || c > '~')
  77                 c = '.';
  78             fprintf(f, "%c", c);
  79         }
  80         fprintf(f, "\n");
  81     }
  82 }
  83 #endif
  84
  85 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  86 {
  87     const char *p, *p1;
  88     int len;
  89     p = *pp;
  90     p1 = strchr(p, sep);
  91     if (!p1)
  92         return -1;
  93     len = p1 - p;
  94     p1++;
  95     if (buf_size > 0) {
  96         if (len > buf_size - 1)
  97             len = buf_size - 1;
  98         memcpy(buf, p, len);
  99         buf[len] = '\0';
 100     }
 101     *pp = p1;
 102     return 0;
 103 }
 104
 105 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 106 {
 107     char buf[512];
 108     struct hostent *he;
 109     const char *p, *r;
 110     int port;
 111
 112     p = str;
 113     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 114         return -1;
 115     saddr->sin_family = AF_INET;
 116     if (buf[0] == '\0') {
 117         saddr->sin_addr.s_addr = 0;
 118     } else {
 119         if (qemu_isdigit(buf[0])) {
 120             if (!inet_aton(buf, &saddr->sin_addr))
 121                 return -1;
 122         } else {
 123             if ((he = gethostbyname(buf)) == NULL)
 124                 return - 1;
 125             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 126         }
 127     }
 128     port = strtol(p, (char **)&r, 0);
 129     if (r == p)
 130         return -1;
 131     saddr->sin_port = htons(port);
 132     return 0;
 133 }
 134
 135 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 136 {
 137     snprintf(nc->info_str, sizeof(nc->info_str),
 138              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 139              nc->model,
 140              macaddr[0], macaddr[1], macaddr[2],
 141              macaddr[3], macaddr[4], macaddr[5]);
 142 }
 143
 144 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 145 {
 146     static int index = 0;
 147     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 148
 149     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 150         return;
 151     macaddr->a[0] = 0x52;
 152     macaddr->a[1] = 0x54;
 153     macaddr->a[2] = 0x00;
 154     macaddr->a[3] = 0x12;
 155     macaddr->a[4] = 0x34;
 156     macaddr->a[5] = 0x56 + index++;
 157 }
 158
 159 /**
 160  * Generate a name for net client
 161  *
 162  * Only net clients created with the legacy -net option and NICs need this.
 163  */
 164 static char *assign_name(NetClientState *nc1, const char *model)
 165 {
 166     NetClientState *nc;
 167     int id = 0;
 168
 169     QTAILQ_FOREACH(nc, &net_clients, next) {
 170         if (nc == nc1) {
 171             continue;
 172         }
 173         if (strcmp(nc->model, model) == 0) {
 174             id++;
 175         }
 176     }
 177
 178     return g_strdup_printf("%s.%d", model, id);
 179 }
 180
 181 static void qemu_net_client_destructor(NetClientState *nc)
 182 {
 183     g_free(nc);
 184 }
 185
 186 static void qemu_net_client_setup(NetClientState *nc,
 187                                   NetClientInfo *info,
 188                                   NetClientState *peer,
 189                                   const char *model,
 190                                   const char *name,
 191                                   NetClientDestructor *destructor)
 192 {
 193     nc->info = info;
 194     nc->model = g_strdup(model);
 195     if (name) {
 196         nc->name = g_strdup(name);
 197     } else {
 198         nc->name = assign_name(nc, model);
 199     }
 200
 201     if (peer) {
 202         assert(!peer->peer);
 203         nc->peer = peer;
 204         peer->peer = nc;
 205     }
 206     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 207
 208     nc->incoming_queue = qemu_new_net_queue(nc);
 209     nc->destructor = destructor;
 210 }
 211
 212 NetClientState *qemu_new_net_client(NetClientInfo *info,
 213                                     NetClientState *peer,
 214                                     const char *model,
 215                                     const char *name)
 216 {
 217     NetClientState *nc;
 218
 219     assert(info->size >= sizeof(NetClientState));
 220
 221     nc = g_malloc0(info->size);
 222     qemu_net_client_setup(nc, info, peer, model, name,
 223                           qemu_net_client_destructor);
 224
 225     return nc;
 226 }
 227
 228 NICState *qemu_new_nic(NetClientInfo *info,
 229                        NICConf *conf,
 230                        const char *model,
 231                        const char *name,
 232                        void *opaque)
 233 {
 234     NetClientState **peers = conf->peers.ncs;
 235     NICState *nic;
 236     int i, queues = MAX(1, conf->queues);
 237
 238     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 239     assert(info->size >= sizeof(NICState));
 240
 241     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 242     nic->ncs = (void *)nic + info->size;
 243     nic->conf = conf;
 244     nic->opaque = opaque;
 245
 246     for (i = 0; i < queues; i++) {
 247         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 248                               NULL);
 249         nic->ncs[i].queue_index = i;
 250     }
 251
 252     return nic;
 253 }
 254
 255 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 256 {
 257     return nic->ncs + queue_index;
 258 }
 259
 260 NetClientState *qemu_get_queue(NICState *nic)
 261 {
 262     return qemu_get_subqueue(nic, 0);
 263 }
 264
 265 NICState *qemu_get_nic(NetClientState *nc)
 266 {
 267     NetClientState *nc0 = nc - nc->queue_index;
 268
 269     return (NICState *)((void *)nc0 - nc->info->size);
 270 }
 271
 272 void *qemu_get_nic_opaque(NetClientState *nc)
 273 {
 274     NICState *nic = qemu_get_nic(nc);
 275
 276     return nic->opaque;
 277 }
 278
 279 static void qemu_cleanup_net_client(NetClientState *nc)
 280 {
 281     QTAILQ_REMOVE(&net_clients, nc, next);
 282
 283     if (nc->info->cleanup) {
 284         nc->info->cleanup(nc);
 285     }
 286 }
 287
 288 static void qemu_free_net_client(NetClientState *nc)
 289 {
 290     if (nc->incoming_queue) {
 291         qemu_del_net_queue(nc->incoming_queue);
 292     }
 293     if (nc->peer) {
 294         nc->peer->peer = NULL;
 295     }
 296     g_free(nc->name);
 297     g_free(nc->model);
 298     if (nc->destructor) {
 299         nc->destructor(nc);
 300     }
 301 }
 302
 303 void qemu_del_net_client(NetClientState *nc)
 304 {
 305     NetClientState *ncs[MAX_QUEUE_NUM];
 306     int queues, i;
 307
 308     /* If the NetClientState belongs to a multiqueue backend, we will change all
 309      * other NetClientStates also.
 310      */
 311     queues = qemu_find_net_clients_except(nc->name, ncs,
 312                                           NET_CLIENT_OPTIONS_KIND_NIC,
 313                                           MAX_QUEUE_NUM);
 314     assert(queues != 0);
 315
 316     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 317     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 318         NICState *nic = qemu_get_nic(nc->peer);
 319         if (nic->peer_deleted) {
 320             return;
 321         }
 322         nic->peer_deleted = true;
 323
 324         for (i = 0; i < queues; i++) {
 325             ncs[i]->peer->link_down = true;
 326         }
 327
 328         if (nc->peer->info->link_status_changed) {
 329             nc->peer->info->link_status_changed(nc->peer);
 330         }
 331
 332         for (i = 0; i < queues; i++) {
 333             qemu_cleanup_net_client(ncs[i]);
 334         }
 335
 336         return;
 337     }
 338
 339     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 340
 341     for (i = 0; i < queues; i++) {
 342         qemu_cleanup_net_client(ncs[i]);
 343         qemu_free_net_client(ncs[i]);
 344     }
 345 }
 346
 347 void qemu_del_nic(NICState *nic)
 348 {
 349     int i, queues = MAX(nic->conf->queues, 1);
 350
 351     /* If this is a peer NIC and peer has already been deleted, free it now. */
 352     if (nic->peer_deleted) {
 353         for (i = 0; i < queues; i++) {
 354             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 355         }
 356     }
 357
 358     for (i = queues - 1; i >= 0; i--) {
 359         NetClientState *nc = qemu_get_subqueue(nic, i);
 360
 361         qemu_cleanup_net_client(nc);
 362         qemu_free_net_client(nc);
 363     }
 364
 365     g_free(nic);
 366 }
 367
 368 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 369 {
 370     NetClientState *nc;
 371
 372     QTAILQ_FOREACH(nc, &net_clients, next) {
 373         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 374             if (nc->queue_index == 0) {
 375                 func(qemu_get_nic(nc), opaque);
 376             }
 377         }
 378     }
 379 }
 380
 381 bool qemu_has_ufo(NetClientState *nc)
 382 {
 383     if (!nc || !nc->info->has_ufo) {
 384         return false;
 385     }
 386
 387     return nc->info->has_ufo(nc);
 388 }
 389
 390 bool qemu_has_vnet_hdr(NetClientState *nc)
 391 {
 392     if (!nc || !nc->info->has_vnet_hdr) {
 393         return false;
 394     }
 395
 396     return nc->info->has_vnet_hdr(nc);
 397 }
 398
 399 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 400 {
 401     if (!nc || !nc->info->has_vnet_hdr_len) {
 402         return false;
 403     }
 404
 405     return nc->info->has_vnet_hdr_len(nc, len);
 406 }
 407
 408 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 409 {
 410     if (!nc || !nc->info->using_vnet_hdr) {
 411         return;
 412     }
 413
 414     nc->info->using_vnet_hdr(nc, enable);
 415 }
 416
 417 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 418                           int ecn, int ufo)
 419 {
 420     if (!nc || !nc->info->set_offload) {
 421         return;
 422     }
 423
 424     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 425 }
 426
 427 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 428 {
 429     if (!nc || !nc->info->set_vnet_hdr_len) {
 430         return;
 431     }
 432
 433     nc->info->set_vnet_hdr_len(nc, len);
 434 }
 435
 436 int qemu_can_send_packet(NetClientState *sender)
 437 {
 438     if (!sender->peer) {
 439         return 1;
 440     }
 441
 442     if (sender->peer->receive_disabled) {
 443         return 0;
 444     } else if (sender->peer->info->can_receive &&
 445                !sender->peer->info->can_receive(sender->peer)) {
 446         return 0;
 447     }
 448     return 1;
 449 }
 450
 451 ssize_t qemu_deliver_packet(NetClientState *sender,
 452                             unsigned flags,
 453                             const uint8_t *data,
 454                             size_t size,
 455                             void *opaque)
 456 {
 457     NetClientState *nc = opaque;
 458     ssize_t ret;
 459
 460     if (nc->link_down) {
 461         return size;
 462     }
 463
 464     if (nc->receive_disabled) {
 465         return 0;
 466     }
 467
 468     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 469         ret = nc->info->receive_raw(nc, data, size);
 470     } else {
 471         ret = nc->info->receive(nc, data, size);
 472     }
 473
 474     if (ret == 0) {
 475         nc->receive_disabled = 1;
 476     }
 477
 478     return ret;
 479 }
 480
 481 void qemu_purge_queued_packets(NetClientState *nc)
 482 {
 483     if (!nc->peer) {
 484         return;
 485     }
 486
 487     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 488 }
 489
 490 void qemu_flush_queued_packets(NetClientState *nc)
 491 {
 492     nc->receive_disabled = 0;
 493
 494     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 495         if (net_hub_flush(nc->peer)) {
 496             qemu_notify_event();
 497         }
 498     }
 499     if (qemu_net_queue_flush(nc->incoming_queue)) {
 500         /* We emptied the queue successfully, signal to the IO thread to repoll
 501          * the file descriptor (for tap, for example).
 502          */
 503         qemu_notify_event();
 504     }
 505 }
 506
 507 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 508                                                  unsigned flags,
 509                                                  const uint8_t *buf, int size,
 510                                                  NetPacketSent *sent_cb)
 511 {
 512     NetQueue *queue;
 513
 514 #ifdef DEBUG_NET
 515     printf("qemu_send_packet_async:\n");
 516     hex_dump(stdout, buf, size);
 517 #endif
 518
 519     if (sender->link_down || !sender->peer) {
 520         return size;
 521     }
 522
 523     queue = sender->peer->incoming_queue;
 524
 525     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 526 }
 527
 528 ssize_t qemu_send_packet_async(NetClientState *sender,
 529                                const uint8_t *buf, int size,
 530                                NetPacketSent *sent_cb)
 531 {
 532     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 533                                              buf, size, sent_cb);
 534 }
 535
 536 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 537 {
 538     qemu_send_packet_async(nc, buf, size, NULL);
 539 }
 540
 541 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 542 {
 543     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 544                                              buf, size, NULL);
 545 }
 546
 547 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 548                                int iovcnt)
 549 {
 550     uint8_t buffer[NET_BUFSIZE];
 551     size_t offset;
 552
 553     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 554
 555     return nc->info->receive(nc, buffer, offset);
 556 }
 557
 558 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 559                                 unsigned flags,
 560                                 const struct iovec *iov,
 561                                 int iovcnt,
 562                                 void *opaque)
 563 {
 564     NetClientState *nc = opaque;
 565     int ret;
 566
 567     if (nc->link_down) {
 568         return iov_size(iov, iovcnt);
 569     }
 570
 571     if (nc->receive_disabled) {
 572         return 0;
 573     }
 574
 575     if (nc->info->receive_iov) {
 576         ret = nc->info->receive_iov(nc, iov, iovcnt);
 577     } else {
 578         ret = nc_sendv_compat(nc, iov, iovcnt);
 579     }
 580
 581     if (ret == 0) {
 582         nc->receive_disabled = 1;
 583     }
 584
 585     return ret;
 586 }
 587
 588 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 589                                 const struct iovec *iov, int iovcnt,
 590                                 NetPacketSent *sent_cb)
 591 {
 592     NetQueue *queue;
 593
 594     if (sender->link_down || !sender->peer) {
 595         return iov_size(iov, iovcnt);
 596     }
 597
 598     queue = sender->peer->incoming_queue;
 599
 600     return qemu_net_queue_send_iov(queue, sender,
 601                                    QEMU_NET_PACKET_FLAG_NONE,
 602                                    iov, iovcnt, sent_cb);
 603 }
 604
 605 ssize_t
 606 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 607 {
 608     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 609 }
 610
 611 NetClientState *qemu_find_netdev(const char *id)
 612 {
 613     NetClientState *nc;
 614
 615     QTAILQ_FOREACH(nc, &net_clients, next) {
 616         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 617             continue;
 618         if (!strcmp(nc->name, id)) {
 619             return nc;
 620         }
 621     }
 622
 623     return NULL;
 624 }
 625
 626 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 627                                  NetClientOptionsKind type, int max)
 628 {
 629     NetClientState *nc;
 630     int ret = 0;
 631
 632     QTAILQ_FOREACH(nc, &net_clients, next) {
 633         if (nc->info->type == type) {
 634             continue;
 635         }
 636         if (!strcmp(nc->name, id)) {
 637             if (ret < max) {
 638                 ncs[ret] = nc;
 639             }
 640             ret++;
 641         }
 642     }
 643
 644     return ret;
 645 }
 646
 647 static int nic_get_free_idx(void)
 648 {
 649     int index;
 650
 651     for (index = 0; index < MAX_NICS; index++)
 652         if (!nd_table[index].used)
 653             return index;
 654     return -1;
 655 }
 656
 657 int qemu_show_nic_models(const char *arg, const char *const *models)
 658 {
 659     int i;
 660
 661     if (!arg || !is_help_option(arg)) {
 662         return 0;
 663     }
 664
 665     fprintf(stderr, "qemu: Supported NIC models: ");
 666     for (i = 0 ; models[i]; i++)
 667         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 668     return 1;
 669 }
 670
 671 void qemu_check_nic_model(NICInfo *nd, const char *model)
 672 {
 673     const char *models[2];
 674
 675     models[0] = model;
 676     models[1] = NULL;
 677
 678     if (qemu_show_nic_models(nd->model, models))
 679         exit(0);
 680     if (qemu_find_nic_model(nd, models, model) < 0)
 681         exit(1);
 682 }
 683
 684 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 685                         const char *default_model)
 686 {
 687     int i;
 688
 689     if (!nd->model)
 690         nd->model = g_strdup(default_model);
 691
 692     for (i = 0 ; models[i]; i++) {
 693         if (strcmp(nd->model, models[i]) == 0)
 694             return i;
 695     }
 696
 697     error_report("Unsupported NIC model: %s", nd->model);
 698     return -1;
 699 }
 700
 701 static int net_init_nic(const NetClientOptions *opts, const char *name,
 702                         NetClientState *peer)
 703 {
 704     int idx;
 705     NICInfo *nd;
 706     const NetLegacyNicOptions *nic;
 707
 708     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 709     nic = opts->nic;
 710
 711     idx = nic_get_free_idx();
 712     if (idx == -1 || nb_nics >= MAX_NICS) {
 713         error_report("Too Many NICs");
 714         return -1;
 715     }
 716
 717     nd = &nd_table[idx];
 718
 719     memset(nd, 0, sizeof(*nd));
 720
 721     if (nic->has_netdev) {
 722         nd->netdev = qemu_find_netdev(nic->netdev);
 723         if (!nd->netdev) {
 724             error_report("netdev '%s' not found", nic->netdev);
 725             return -1;
 726         }
 727     } else {
 728         assert(peer);
 729         nd->netdev = peer;
 730     }
 731     nd->name = g_strdup(name);
 732     if (nic->has_model) {
 733         nd->model = g_strdup(nic->model);
 734     }
 735     if (nic->has_addr) {
 736         nd->devaddr = g_strdup(nic->addr);
 737     }
 738
 739     if (nic->has_macaddr &&
 740         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 741         error_report("invalid syntax for ethernet address");
 742         return -1;
 743     }
 744     if (nic->has_macaddr &&
 745         is_multicast_ether_addr(nd->macaddr.a)) {
 746         error_report("NIC cannot have multicast MAC address (odd 1st byte)");
 747         return -1;
 748     }
 749     qemu_macaddr_default_if_unset(&nd->macaddr);
 750
 751     if (nic->has_vectors) {
 752         if (nic->vectors > 0x7ffffff) {
 753             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 754             return -1;
 755         }
 756         nd->nvectors = nic->vectors;
 757     } else {
 758         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 759     }
 760
 761     nd->used = 1;
 762     nb_nics++;
 763
 764     return idx;
 765 }
 766
 767
 768 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 769     const NetClientOptions *opts,
 770     const char *name,
 771     NetClientState *peer) = {
 772         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 773 #ifdef CONFIG_SLIRP
 774         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 775 #endif
 776         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 777         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 778 #ifdef CONFIG_VDE
 779         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 780 #endif
 781 #ifdef CONFIG_NETMAP
 782         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 783 #endif
 784         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 785 #ifdef CONFIG_NET_BRIDGE
 786         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 787 #endif
 788         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 789 };
 790
 791
 792 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 793 {
 794     union {
 795         const Netdev    *netdev;
 796         const NetLegacy *net;
 797     } u;
 798     const NetClientOptions *opts;
 799     const char *name;
 800
 801     if (is_netdev) {
 802         u.netdev = object;
 803         opts = u.netdev->opts;
 804         name = u.netdev->id;
 805
 806         switch (opts->kind) {
 807 #ifdef CONFIG_SLIRP
 808         case NET_CLIENT_OPTIONS_KIND_USER:
 809 #endif
 810         case NET_CLIENT_OPTIONS_KIND_TAP:
 811         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 812 #ifdef CONFIG_VDE
 813         case NET_CLIENT_OPTIONS_KIND_VDE:
 814 #endif
 815 #ifdef CONFIG_NETMAP
 816         case NET_CLIENT_OPTIONS_KIND_NETMAP:
 817 #endif
 818 #ifdef CONFIG_NET_BRIDGE
 819         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 820 #endif
 821         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 822             break;
 823
 824         default:
 825             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 826                       "a netdev backend type");
 827             return -1;
 828         }
 829     } else {
 830         u.net = object;
 831         opts = u.net->opts;
 832         /* missing optional values have been initialized to "all bits zero" */
 833         name = u.net->has_id ? u.net->id : u.net->name;
 834     }
 835
 836     if (net_client_init_fun[opts->kind]) {
 837         NetClientState *peer = NULL;
 838
 839         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 840          * parameter. */
 841         if (!is_netdev &&
 842             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 843              !opts->nic->has_netdev)) {
 844             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 845         }
 846
 847         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 848             /* TODO push error reporting into init() methods */
 849             error_set(errp, QERR_DEVICE_INIT_FAILED,
 850                       NetClientOptionsKind_lookup[opts->kind]);
 851             return -1;
 852         }
 853     }
 854     return 0;
 855 }
 856
 857
 858 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 859 {
 860     if (is_netdev) {
 861         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 862     } else {
 863         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 864     }
 865 }
 866
 867
 868 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 869 {
 870     void *object = NULL;
 871     Error *err = NULL;
 872     int ret = -1;
 873
 874     {
 875         OptsVisitor *ov = opts_visitor_new(opts);
 876
 877         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 878         opts_visitor_cleanup(ov);
 879     }
 880
 881     if (!err) {
 882         ret = net_client_init1(object, is_netdev, &err);
 883     }
 884
 885     if (object) {
 886         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 887
 888         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 889         qapi_dealloc_visitor_cleanup(dv);
 890     }
 891
 892     error_propagate(errp, err);
 893     return ret;
 894 }
 895
 896
 897 static int net_host_check_device(const char *device)
 898 {
 899     int i;
 900     const char *valid_param_list[] = { "tap", "socket", "dump"
 901 #ifdef CONFIG_NET_BRIDGE
 902                                        , "bridge"
 903 #endif
 904 #ifdef CONFIG_SLIRP
 905                                        ,"user"
 906 #endif
 907 #ifdef CONFIG_VDE
 908                                        ,"vde"
 909 #endif
 910     };
 911     for (i = 0; i < ARRAY_SIZE(valid_param_list); i++) {
 912         if (!strncmp(valid_param_list[i], device,
 913                      strlen(valid_param_list[i])))
 914             return 1;
 915     }
 916
 917     return 0;
 918 }
 919
 920 void net_host_device_add(Monitor *mon, const QDict *qdict)
 921 {
 922     const char *device = qdict_get_str(qdict, "device");
 923     const char *opts_str = qdict_get_try_str(qdict, "opts");
 924     Error *local_err = NULL;
 925     QemuOpts *opts;
 926
 927     if (!net_host_check_device(device)) {
 928         monitor_printf(mon, "invalid host network device %s\n", device);
 929         return;
 930     }
 931
 932     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 933     if (!opts) {
 934         return;
 935     }
 936
 937     qemu_opt_set(opts, "type", device);
 938
 939     net_client_init(opts, 0, &local_err);
 940     if (local_err) {
 941         qerror_report_err(local_err);
 942         error_free(local_err);
 943         monitor_printf(mon, "adding host network device %s failed\n", device);
 944     }
 945 }
 946
 947 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 948 {
 949     NetClientState *nc;
 950     int vlan_id = qdict_get_int(qdict, "vlan_id");
 951     const char *device = qdict_get_str(qdict, "device");
 952
 953     nc = net_hub_find_client_by_name(vlan_id, device);
 954     if (!nc) {
 955         error_report("Host network device '%s' on hub '%d' not found",
 956                      device, vlan_id);
 957         return;
 958     }
 959     if (!net_host_check_device(nc->model)) {
 960         error_report("invalid host network device '%s'", device);
 961         return;
 962     }
 963     qemu_del_net_client(nc);
 964 }
 965
 966 void netdev_add(QemuOpts *opts, Error **errp)
 967 {
 968     net_client_init(opts, 1, errp);
 969 }
 970
 971 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 972 {
 973     Error *local_err = NULL;
 974     QemuOptsList *opts_list;
 975     QemuOpts *opts;
 976
 977     opts_list = qemu_find_opts_err("netdev", &local_err);
 978     if (local_err) {
 979         goto exit_err;
 980     }
 981
 982     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
 983     if (local_err) {
 984         goto exit_err;
 985     }
 986
 987     netdev_add(opts, &local_err);
 988     if (local_err) {
 989         qemu_opts_del(opts);
 990         goto exit_err;
 991     }
 992
 993     return 0;
 994
 995 exit_err:
 996     qerror_report_err(local_err);
 997     error_free(local_err);
 998     return -1;
 999 }
1000
1001 void qmp_netdev_del(const char *id, Error **errp)
1002 {
1003     NetClientState *nc;
1004     QemuOpts *opts;
1005
1006     nc = qemu_find_netdev(id);
1007     if (!nc) {
1008         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
1009         return;
1010     }
1011
1012     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1013     if (!opts) {
1014         error_setg(errp, "Device '%s' is not a netdev", id);
1015         return;
1016     }
1017
1018     qemu_del_net_client(nc);
1019     qemu_opts_del(opts);
1020 }
1021
1022 void print_net_client(Monitor *mon, NetClientState *nc)
1023 {
1024     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1025                    nc->queue_index,
1026                    NetClientOptionsKind_lookup[nc->info->type],
1027                    nc->info_str);
1028 }
1029
1030 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1031                                       Error **errp)
1032 {
1033     NetClientState *nc;
1034     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1035
1036     QTAILQ_FOREACH(nc, &net_clients, next) {
1037         RxFilterInfoList *entry;
1038         RxFilterInfo *info;
1039
1040         if (has_name && strcmp(nc->name, name) != 0) {
1041             continue;
1042         }
1043
1044         /* only query rx-filter information of NIC */
1045         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1046             if (has_name) {
1047                 error_setg(errp, "net client(%s) isn't a NIC", name);
1048                 return NULL;
1049             }
1050             continue;
1051         }
1052
1053         if (nc->info->query_rx_filter) {
1054             info = nc->info->query_rx_filter(nc);
1055             entry = g_malloc0(sizeof(*entry));
1056             entry->value = info;
1057
1058             if (!filter_list) {
1059                 filter_list = entry;
1060             } else {
1061                 last_entry->next = entry;
1062             }
1063             last_entry = entry;
1064         } else if (has_name) {
1065             error_setg(errp, "net client(%s) doesn't support"
1066                        " rx-filter querying", name);
1067             return NULL;
1068         }
1069
1070         if (has_name) {
1071             break;
1072         }
1073     }
1074
1075     if (filter_list == NULL && has_name) {
1076         error_setg(errp, "invalid net client name: %s", name);
1077     }
1078
1079     return filter_list;
1080 }
1081
1082 void do_info_network(Monitor *mon, const QDict *qdict)
1083 {
1084     NetClientState *nc, *peer;
1085     NetClientOptionsKind type;
1086
1087     net_hub_info(mon);
1088
1089     QTAILQ_FOREACH(nc, &net_clients, next) {
1090         peer = nc->peer;
1091         type = nc->info->type;
1092
1093         /* Skip if already printed in hub info */
1094         if (net_hub_id_for_client(nc, NULL) == 0) {
1095             continue;
1096         }
1097
1098         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1099             print_net_client(mon, nc);
1100         } /* else it's a netdev connected to a NIC, printed with the NIC */
1101         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1102             monitor_printf(mon, " \\ ");
1103             print_net_client(mon, peer);
1104         }
1105     }
1106 }
1107
1108 void qmp_set_link(const char *name, bool up, Error **errp)
1109 {
1110     NetClientState *ncs[MAX_QUEUE_NUM];
1111     NetClientState *nc;
1112     int queues, i;
1113
1114     queues = qemu_find_net_clients_except(name, ncs,
1115                                           NET_CLIENT_OPTIONS_KIND_MAX,
1116                                           MAX_QUEUE_NUM);
1117
1118     if (queues == 0) {
1119         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
1120         return;
1121     }
1122     nc = ncs[0];
1123
1124     for (i = 0; i < queues; i++) {
1125         ncs[i]->link_down = !up;
1126     }
1127
1128     if (nc->info->link_status_changed) {
1129         nc->info->link_status_changed(nc);
1130     }
1131
1132     if (nc->peer) {
1133         /* Change peer link only if the peer is NIC and then notify peer.
1134          * If the peer is a HUBPORT or a backend, we do not change the
1135          * link status.
1136          *
1137          * This behavior is compatible with qemu vlans where there could be
1138          * multiple clients that can still communicate with each other in
1139          * disconnected mode. For now maintain this compatibility.
1140          */
1141         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1142             for (i = 0; i < queues; i++) {
1143                 ncs[i]->peer->link_down = !up;
1144             }
1145         }
1146         if (nc->peer->info->link_status_changed) {
1147             nc->peer->info->link_status_changed(nc->peer);
1148         }
1149     }
1150 }
1151
1152 void net_cleanup(void)
1153 {
1154     NetClientState *nc;
1155
1156     /* We may del multiple entries during qemu_del_net_client(),
1157      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1158      */
1159     while (!QTAILQ_EMPTY(&net_clients)) {
1160         nc = QTAILQ_FIRST(&net_clients);
1161         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1162             qemu_del_nic(qemu_get_nic(nc));
1163         } else {
1164             qemu_del_net_client(nc);
1165         }
1166     }
1167 }
1168
1169 void net_check_clients(void)
1170 {
1171     NetClientState *nc;
1172     int i;
1173
1174     /* Don't warn about the default network setup that you get if
1175      * no command line -net or -netdev options are specified. There
1176      * are two cases that we would otherwise complain about:
1177      * (1) board doesn't support a NIC but the implicit "-net nic"
1178      * requested one
1179      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1180      * sets up a nic that isn't connected to anything.
1181      */
1182     if (default_net) {
1183         return;
1184     }
1185
1186     net_hub_check_clients();
1187
1188     QTAILQ_FOREACH(nc, &net_clients, next) {
1189         if (!nc->peer) {
1190             fprintf(stderr, "Warning: %s %s has no peer\n",
1191                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1192                     "nic" : "netdev", nc->name);
1193         }
1194     }
1195
1196     /* Check that all NICs requested via -net nic actually got created.
1197      * NICs created via -device don't need to be checked here because
1198      * they are always instantiated.
1199      */
1200     for (i = 0; i < MAX_NICS; i++) {
1201         NICInfo *nd = &nd_table[i];
1202         if (nd->used && !nd->instantiated) {
1203             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1204                     "was not created (not supported by this machine?)\n",
1205                     nd->name ? nd->name : "anonymous",
1206                     nd->model ? nd->model : "unspecified");
1207         }
1208     }
1209 }
1210
1211 static int net_init_client(QemuOpts *opts, void *dummy)
1212 {
1213     Error *local_err = NULL;
1214
1215     net_client_init(opts, 0, &local_err);
1216     if (local_err) {
1217         qerror_report_err(local_err);
1218         error_free(local_err);
1219         return -1;
1220     }
1221
1222     return 0;
1223 }
1224
1225 static int net_init_netdev(QemuOpts *opts, void *dummy)
1226 {
1227     Error *local_err = NULL;
1228     int ret;
1229
1230     ret = net_client_init(opts, 1, &local_err);
1231     if (local_err) {
1232         qerror_report_err(local_err);
1233         error_free(local_err);
1234         return -1;
1235     }
1236
1237     return ret;
1238 }
1239
1240 int net_init_clients(void)
1241 {
1242     QemuOptsList *net = qemu_find_opts("net");
1243
1244     if (default_net) {
1245         /* if no clients, we use a default config */
1246         qemu_opts_set(net, NULL, "type", "nic");
1247 #ifdef CONFIG_SLIRP
1248         qemu_opts_set(net, NULL, "type", "user");
1249 #endif
1250     }
1251
1252     QTAILQ_INIT(&net_clients);
1253
1254     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1255         return -1;
1256
1257     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1258         return -1;
1259     }
1260
1261     return 0;
1262 }
1263
1264 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1265 {
1266 #if defined(CONFIG_SLIRP)
1267     int ret;
1268     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1269         return ret;
1270     }
1271 #endif
1272
1273     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1274         return -1;
1275     }
1276
1277     default_net = 0;
1278     return 0;
1279 }
1280
1281 /* From FreeBSD */
1282 /* XXX: optimize */
1283 unsigned compute_mcast_idx(const uint8_t *ep)
1284 {
1285     uint32_t crc;
1286     int carry, i, j;
1287     uint8_t b;
1288
1289     crc = 0xffffffff;
1290     for (i = 0; i < 6; i++) {
1291         b = *ep++;
1292         for (j = 0; j < 8; j++) {
1293             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1294             crc <<= 1;
1295             b >>= 1;
1296             if (carry) {
1297                 crc = ((crc ^ POLYNOMIAL) | carry);
1298             }
1299         }
1300     }
1301     return crc >> 26;
1302 }
1303
1304 QemuOptsList qemu_netdev_opts = {
1305     .name = "netdev",
1306     .implied_opt_name = "type",
1307     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1308     .desc = {
1309         /*
1310          * no elements => accept any params
1311          * validation will happen later
1312          */
1313         { /* end of list */ }
1314     },
1315 };
1316
1317 QemuOptsList qemu_net_opts = {
1318     .name = "net",
1319     .implied_opt_name = "type",
1320     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1321     .desc = {
1322         /*
1323          * no elements => accept any params
1324          * validation will happen later
1325          */
1326         { /* end of list */ }
1327     },
1328 };