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 "qapi/qmp/qerror.h"
  36 #include "qemu/error-report.h"
  37 #include "qemu/sockets.h"
  38 #include "qemu/config-file.h"
  39 #include "qmp-commands.h"
  40 #include "hw/qdev.h"
  41 #include "qemu/iov.h"
  42 #include "qemu/main-loop.h"
  43 #include "qapi-visit.h"
  44 #include "qapi/opts-visitor.h"
  45 #include "qapi/dealloc-visitor.h"
  46 #include "sysemu/sysemu.h"
  47 #include "net/filter.h"
  48
  49 /* Net bridge is currently not supported for W32. */
  50 #if !defined(_WIN32)
  51 # define CONFIG_NET_BRIDGE
  52 #endif
  53
  54 static VMChangeStateEntry *net_change_state_entry;
  55 static QTAILQ_HEAD(, NetClientState) net_clients;
  56
  57 const char *host_net_devices[] = {
  58     "tap",
  59     "socket",
  60     "dump",
  61 #ifdef CONFIG_NET_BRIDGE
  62     "bridge",
  63 #endif
  64 #ifdef CONFIG_NETMAP
  65     "netmap",
  66 #endif
  67 #ifdef CONFIG_SLIRP
  68     "user",
  69 #endif
  70 #ifdef CONFIG_VDE
  71     "vde",
  72 #endif
  73     "vhost-user",
  74     NULL,
  75 };
  76
  77 int default_net = 1;
  78
  79 /***********************************************************/
  80 /* network device redirectors */
  81
  82 #if defined(DEBUG_NET)
  83 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  84 {
  85     int len, i, j, c;
  86
  87     for(i=0;i<size;i+=16) {
  88         len = size - i;
  89         if (len > 16)
  90             len = 16;
  91         fprintf(f, "%08x ", i);
  92         for(j=0;j<16;j++) {
  93             if (j < len)
  94                 fprintf(f, " %02x", buf[i+j]);
  95             else
  96                 fprintf(f, "   ");
  97         }
  98         fprintf(f, " ");
  99         for(j=0;j<len;j++) {
 100             c = buf[i+j];
 101             if (c < ' ' || c > '~')
 102                 c = '.';
 103             fprintf(f, "%c", c);
 104         }
 105         fprintf(f, "\n");
 106     }
 107 }
 108 #endif
 109
 110 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
 111 {
 112     const char *p, *p1;
 113     int len;
 114     p = *pp;
 115     p1 = strchr(p, sep);
 116     if (!p1)
 117         return -1;
 118     len = p1 - p;
 119     p1++;
 120     if (buf_size > 0) {
 121         if (len > buf_size - 1)
 122             len = buf_size - 1;
 123         memcpy(buf, p, len);
 124         buf[len] = '\0';
 125     }
 126     *pp = p1;
 127     return 0;
 128 }
 129
 130 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 131 {
 132     char buf[512];
 133     struct hostent *he;
 134     const char *p, *r;
 135     int port;
 136
 137     p = str;
 138     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 139         return -1;
 140     saddr->sin_family = AF_INET;
 141     if (buf[0] == '\0') {
 142         saddr->sin_addr.s_addr = 0;
 143     } else {
 144         if (qemu_isdigit(buf[0])) {
 145             if (!inet_aton(buf, &saddr->sin_addr))
 146                 return -1;
 147         } else {
 148             if ((he = gethostbyname(buf)) == NULL)
 149                 return - 1;
 150             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 151         }
 152     }
 153     port = strtol(p, (char **)&r, 0);
 154     if (r == p)
 155         return -1;
 156     saddr->sin_port = htons(port);
 157     return 0;
 158 }
 159
 160 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 161 {
 162     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 163                            macaddr[0], macaddr[1], macaddr[2],
 164                            macaddr[3], macaddr[4], macaddr[5]);
 165 }
 166
 167 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 168 {
 169     snprintf(nc->info_str, sizeof(nc->info_str),
 170              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 171              nc->model,
 172              macaddr[0], macaddr[1], macaddr[2],
 173              macaddr[3], macaddr[4], macaddr[5]);
 174 }
 175
 176 static int mac_table[256] = {0};
 177
 178 static void qemu_macaddr_set_used(MACAddr *macaddr)
 179 {
 180     int index;
 181
 182     for (index = 0x56; index < 0xFF; index++) {
 183         if (macaddr->a[5] == index) {
 184             mac_table[index]++;
 185         }
 186     }
 187 }
 188
 189 static void qemu_macaddr_set_free(MACAddr *macaddr)
 190 {
 191     int index;
 192     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 193
 194     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 195         return;
 196     }
 197     for (index = 0x56; index < 0xFF; index++) {
 198         if (macaddr->a[5] == index) {
 199             mac_table[index]--;
 200         }
 201     }
 202 }
 203
 204 static int qemu_macaddr_get_free(void)
 205 {
 206     int index;
 207
 208     for (index = 0x56; index < 0xFF; index++) {
 209         if (mac_table[index] == 0) {
 210             return index;
 211         }
 212     }
 213
 214     return -1;
 215 }
 216
 217 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 218 {
 219     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 220     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 221
 222     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 223         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 224             return;
 225         } else {
 226             qemu_macaddr_set_used(macaddr);
 227             return;
 228         }
 229     }
 230
 231     macaddr->a[0] = 0x52;
 232     macaddr->a[1] = 0x54;
 233     macaddr->a[2] = 0x00;
 234     macaddr->a[3] = 0x12;
 235     macaddr->a[4] = 0x34;
 236     macaddr->a[5] = qemu_macaddr_get_free();
 237     qemu_macaddr_set_used(macaddr);
 238 }
 239
 240 /**
 241  * Generate a name for net client
 242  *
 243  * Only net clients created with the legacy -net option and NICs need this.
 244  */
 245 static char *assign_name(NetClientState *nc1, const char *model)
 246 {
 247     NetClientState *nc;
 248     int id = 0;
 249
 250     QTAILQ_FOREACH(nc, &net_clients, next) {
 251         if (nc == nc1) {
 252             continue;
 253         }
 254         if (strcmp(nc->model, model) == 0) {
 255             id++;
 256         }
 257     }
 258
 259     return g_strdup_printf("%s.%d", model, id);
 260 }
 261
 262 static void qemu_net_client_destructor(NetClientState *nc)
 263 {
 264     g_free(nc);
 265 }
 266
 267 static void qemu_net_client_setup(NetClientState *nc,
 268                                   NetClientInfo *info,
 269                                   NetClientState *peer,
 270                                   const char *model,
 271                                   const char *name,
 272                                   NetClientDestructor *destructor)
 273 {
 274     nc->info = info;
 275     nc->model = g_strdup(model);
 276     if (name) {
 277         nc->name = g_strdup(name);
 278     } else {
 279         nc->name = assign_name(nc, model);
 280     }
 281
 282     if (peer) {
 283         assert(!peer->peer);
 284         nc->peer = peer;
 285         peer->peer = nc;
 286     }
 287     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 288
 289     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 290     nc->destructor = destructor;
 291     QTAILQ_INIT(&nc->filters);
 292 }
 293
 294 NetClientState *qemu_new_net_client(NetClientInfo *info,
 295                                     NetClientState *peer,
 296                                     const char *model,
 297                                     const char *name)
 298 {
 299     NetClientState *nc;
 300
 301     assert(info->size >= sizeof(NetClientState));
 302
 303     nc = g_malloc0(info->size);
 304     qemu_net_client_setup(nc, info, peer, model, name,
 305                           qemu_net_client_destructor);
 306
 307     return nc;
 308 }
 309
 310 NICState *qemu_new_nic(NetClientInfo *info,
 311                        NICConf *conf,
 312                        const char *model,
 313                        const char *name,
 314                        void *opaque)
 315 {
 316     NetClientState **peers = conf->peers.ncs;
 317     NICState *nic;
 318     int i, queues = MAX(1, conf->peers.queues);
 319
 320     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 321     assert(info->size >= sizeof(NICState));
 322
 323     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 324     nic->ncs = (void *)nic + info->size;
 325     nic->conf = conf;
 326     nic->opaque = opaque;
 327
 328     for (i = 0; i < queues; i++) {
 329         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 330                               NULL);
 331         nic->ncs[i].queue_index = i;
 332     }
 333
 334     return nic;
 335 }
 336
 337 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 338 {
 339     return nic->ncs + queue_index;
 340 }
 341
 342 NetClientState *qemu_get_queue(NICState *nic)
 343 {
 344     return qemu_get_subqueue(nic, 0);
 345 }
 346
 347 NICState *qemu_get_nic(NetClientState *nc)
 348 {
 349     NetClientState *nc0 = nc - nc->queue_index;
 350
 351     return (NICState *)((void *)nc0 - nc->info->size);
 352 }
 353
 354 void *qemu_get_nic_opaque(NetClientState *nc)
 355 {
 356     NICState *nic = qemu_get_nic(nc);
 357
 358     return nic->opaque;
 359 }
 360
 361 static void qemu_cleanup_net_client(NetClientState *nc)
 362 {
 363     QTAILQ_REMOVE(&net_clients, nc, next);
 364
 365     if (nc->info->cleanup) {
 366         nc->info->cleanup(nc);
 367     }
 368 }
 369
 370 static void qemu_free_net_client(NetClientState *nc)
 371 {
 372     if (nc->incoming_queue) {
 373         qemu_del_net_queue(nc->incoming_queue);
 374     }
 375     if (nc->peer) {
 376         nc->peer->peer = NULL;
 377     }
 378     g_free(nc->name);
 379     g_free(nc->model);
 380     if (nc->destructor) {
 381         nc->destructor(nc);
 382     }
 383 }
 384
 385 void qemu_del_net_client(NetClientState *nc)
 386 {
 387     NetClientState *ncs[MAX_QUEUE_NUM];
 388     int queues, i;
 389     NetFilterState *nf, *next;
 390
 391     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 392
 393     /* If the NetClientState belongs to a multiqueue backend, we will change all
 394      * other NetClientStates also.
 395      */
 396     queues = qemu_find_net_clients_except(nc->name, ncs,
 397                                           NET_CLIENT_OPTIONS_KIND_NIC,
 398                                           MAX_QUEUE_NUM);
 399     assert(queues != 0);
 400
 401     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 402         object_unparent(OBJECT(nf));
 403     }
 404
 405     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 406     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 407         NICState *nic = qemu_get_nic(nc->peer);
 408         if (nic->peer_deleted) {
 409             return;
 410         }
 411         nic->peer_deleted = true;
 412
 413         for (i = 0; i < queues; i++) {
 414             ncs[i]->peer->link_down = true;
 415         }
 416
 417         if (nc->peer->info->link_status_changed) {
 418             nc->peer->info->link_status_changed(nc->peer);
 419         }
 420
 421         for (i = 0; i < queues; i++) {
 422             qemu_cleanup_net_client(ncs[i]);
 423         }
 424
 425         return;
 426     }
 427
 428     for (i = 0; i < queues; i++) {
 429         qemu_cleanup_net_client(ncs[i]);
 430         qemu_free_net_client(ncs[i]);
 431     }
 432 }
 433
 434 void qemu_del_nic(NICState *nic)
 435 {
 436     int i, queues = MAX(nic->conf->peers.queues, 1);
 437
 438     qemu_macaddr_set_free(&nic->conf->macaddr);
 439
 440     /* If this is a peer NIC and peer has already been deleted, free it now. */
 441     if (nic->peer_deleted) {
 442         for (i = 0; i < queues; i++) {
 443             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 444         }
 445     }
 446
 447     for (i = queues - 1; i >= 0; i--) {
 448         NetClientState *nc = qemu_get_subqueue(nic, i);
 449
 450         qemu_cleanup_net_client(nc);
 451         qemu_free_net_client(nc);
 452     }
 453
 454     g_free(nic);
 455 }
 456
 457 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 458 {
 459     NetClientState *nc;
 460
 461     QTAILQ_FOREACH(nc, &net_clients, next) {
 462         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 463             if (nc->queue_index == 0) {
 464                 func(qemu_get_nic(nc), opaque);
 465             }
 466         }
 467     }
 468 }
 469
 470 bool qemu_has_ufo(NetClientState *nc)
 471 {
 472     if (!nc || !nc->info->has_ufo) {
 473         return false;
 474     }
 475
 476     return nc->info->has_ufo(nc);
 477 }
 478
 479 bool qemu_has_vnet_hdr(NetClientState *nc)
 480 {
 481     if (!nc || !nc->info->has_vnet_hdr) {
 482         return false;
 483     }
 484
 485     return nc->info->has_vnet_hdr(nc);
 486 }
 487
 488 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 489 {
 490     if (!nc || !nc->info->has_vnet_hdr_len) {
 491         return false;
 492     }
 493
 494     return nc->info->has_vnet_hdr_len(nc, len);
 495 }
 496
 497 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 498 {
 499     if (!nc || !nc->info->using_vnet_hdr) {
 500         return;
 501     }
 502
 503     nc->info->using_vnet_hdr(nc, enable);
 504 }
 505
 506 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 507                           int ecn, int ufo)
 508 {
 509     if (!nc || !nc->info->set_offload) {
 510         return;
 511     }
 512
 513     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 514 }
 515
 516 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 517 {
 518     if (!nc || !nc->info->set_vnet_hdr_len) {
 519         return;
 520     }
 521
 522     nc->info->set_vnet_hdr_len(nc, len);
 523 }
 524
 525 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 526 {
 527     if (!nc || !nc->info->set_vnet_le) {
 528         return -ENOSYS;
 529     }
 530
 531     return nc->info->set_vnet_le(nc, is_le);
 532 }
 533
 534 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 535 {
 536     if (!nc || !nc->info->set_vnet_be) {
 537         return -ENOSYS;
 538     }
 539
 540     return nc->info->set_vnet_be(nc, is_be);
 541 }
 542
 543 int qemu_can_send_packet(NetClientState *sender)
 544 {
 545     int vm_running = runstate_is_running();
 546
 547     if (!vm_running) {
 548         return 0;
 549     }
 550
 551     if (!sender->peer) {
 552         return 1;
 553     }
 554
 555     if (sender->peer->receive_disabled) {
 556         return 0;
 557     } else if (sender->peer->info->can_receive &&
 558                !sender->peer->info->can_receive(sender->peer)) {
 559         return 0;
 560     }
 561     return 1;
 562 }
 563
 564 static ssize_t filter_receive_iov(NetClientState *nc,
 565                                   NetFilterDirection direction,
 566                                   NetClientState *sender,
 567                                   unsigned flags,
 568                                   const struct iovec *iov,
 569                                   int iovcnt,
 570                                   NetPacketSent *sent_cb)
 571 {
 572     ssize_t ret = 0;
 573     NetFilterState *nf = NULL;
 574
 575     QTAILQ_FOREACH(nf, &nc->filters, next) {
 576         ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 577                                      iovcnt, sent_cb);
 578         if (ret) {
 579             return ret;
 580         }
 581     }
 582
 583     return ret;
 584 }
 585
 586 static ssize_t filter_receive(NetClientState *nc,
 587                               NetFilterDirection direction,
 588                               NetClientState *sender,
 589                               unsigned flags,
 590                               const uint8_t *data,
 591                               size_t size,
 592                               NetPacketSent *sent_cb)
 593 {
 594     struct iovec iov = {
 595         .iov_base = (void *)data,
 596         .iov_len = size
 597     };
 598
 599     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 600 }
 601
 602 void qemu_purge_queued_packets(NetClientState *nc)
 603 {
 604     if (!nc->peer) {
 605         return;
 606     }
 607
 608     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 609 }
 610
 611 static
 612 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 613 {
 614     nc->receive_disabled = 0;
 615
 616     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 617         if (net_hub_flush(nc->peer)) {
 618             qemu_notify_event();
 619         }
 620     }
 621     if (qemu_net_queue_flush(nc->incoming_queue)) {
 622         /* We emptied the queue successfully, signal to the IO thread to repoll
 623          * the file descriptor (for tap, for example).
 624          */
 625         qemu_notify_event();
 626     } else if (purge) {
 627         /* Unable to empty the queue, purge remaining packets */
 628         qemu_net_queue_purge(nc->incoming_queue, nc);
 629     }
 630 }
 631
 632 void qemu_flush_queued_packets(NetClientState *nc)
 633 {
 634     qemu_flush_or_purge_queued_packets(nc, false);
 635 }
 636
 637 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 638                                                  unsigned flags,
 639                                                  const uint8_t *buf, int size,
 640                                                  NetPacketSent *sent_cb)
 641 {
 642     NetQueue *queue;
 643     int ret;
 644
 645 #ifdef DEBUG_NET
 646     printf("qemu_send_packet_async:\n");
 647     hex_dump(stdout, buf, size);
 648 #endif
 649
 650     if (sender->link_down || !sender->peer) {
 651         return size;
 652     }
 653
 654     /* Let filters handle the packet first */
 655     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 656                          sender, flags, buf, size, sent_cb);
 657     if (ret) {
 658         return ret;
 659     }
 660
 661     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 662                          sender, flags, buf, size, sent_cb);
 663     if (ret) {
 664         return ret;
 665     }
 666
 667     queue = sender->peer->incoming_queue;
 668
 669     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 670 }
 671
 672 ssize_t qemu_send_packet_async(NetClientState *sender,
 673                                const uint8_t *buf, int size,
 674                                NetPacketSent *sent_cb)
 675 {
 676     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 677                                              buf, size, sent_cb);
 678 }
 679
 680 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 681 {
 682     qemu_send_packet_async(nc, buf, size, NULL);
 683 }
 684
 685 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 686 {
 687     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 688                                              buf, size, NULL);
 689 }
 690
 691 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 692                                int iovcnt, unsigned flags)
 693 {
 694     uint8_t buf[NET_BUFSIZE];
 695     uint8_t *buffer;
 696     size_t offset;
 697
 698     if (iovcnt == 1) {
 699         buffer = iov[0].iov_base;
 700         offset = iov[0].iov_len;
 701     } else {
 702         buffer = buf;
 703         offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 704     }
 705
 706     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 707         return nc->info->receive_raw(nc, buffer, offset);
 708     } else {
 709         return nc->info->receive(nc, buffer, offset);
 710     }
 711 }
 712
 713 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 714                                 unsigned flags,
 715                                 const struct iovec *iov,
 716                                 int iovcnt,
 717                                 void *opaque)
 718 {
 719     NetClientState *nc = opaque;
 720     int ret;
 721
 722     if (nc->link_down) {
 723         return iov_size(iov, iovcnt);
 724     }
 725
 726     if (nc->receive_disabled) {
 727         return 0;
 728     }
 729
 730     if (nc->info->receive_iov) {
 731         ret = nc->info->receive_iov(nc, iov, iovcnt);
 732     } else {
 733         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 734     }
 735
 736     if (ret == 0) {
 737         nc->receive_disabled = 1;
 738     }
 739
 740     return ret;
 741 }
 742
 743 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 744                                 const struct iovec *iov, int iovcnt,
 745                                 NetPacketSent *sent_cb)
 746 {
 747     NetQueue *queue;
 748     int ret;
 749
 750     if (sender->link_down || !sender->peer) {
 751         return iov_size(iov, iovcnt);
 752     }
 753
 754     /* Let filters handle the packet first */
 755     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 756                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 757     if (ret) {
 758         return ret;
 759     }
 760
 761     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 762                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 763     if (ret) {
 764         return ret;
 765     }
 766
 767     queue = sender->peer->incoming_queue;
 768
 769     return qemu_net_queue_send_iov(queue, sender,
 770                                    QEMU_NET_PACKET_FLAG_NONE,
 771                                    iov, iovcnt, sent_cb);
 772 }
 773
 774 ssize_t
 775 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 776 {
 777     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 778 }
 779
 780 NetClientState *qemu_find_netdev(const char *id)
 781 {
 782     NetClientState *nc;
 783
 784     QTAILQ_FOREACH(nc, &net_clients, next) {
 785         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 786             continue;
 787         if (!strcmp(nc->name, id)) {
 788             return nc;
 789         }
 790     }
 791
 792     return NULL;
 793 }
 794
 795 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 796                                  NetClientOptionsKind type, int max)
 797 {
 798     NetClientState *nc;
 799     int ret = 0;
 800
 801     QTAILQ_FOREACH(nc, &net_clients, next) {
 802         if (nc->info->type == type) {
 803             continue;
 804         }
 805         if (!id || !strcmp(nc->name, id)) {
 806             if (ret < max) {
 807                 ncs[ret] = nc;
 808             }
 809             ret++;
 810         }
 811     }
 812
 813     return ret;
 814 }
 815
 816 static int nic_get_free_idx(void)
 817 {
 818     int index;
 819
 820     for (index = 0; index < MAX_NICS; index++)
 821         if (!nd_table[index].used)
 822             return index;
 823     return -1;
 824 }
 825
 826 int qemu_show_nic_models(const char *arg, const char *const *models)
 827 {
 828     int i;
 829
 830     if (!arg || !is_help_option(arg)) {
 831         return 0;
 832     }
 833
 834     fprintf(stderr, "qemu: Supported NIC models: ");
 835     for (i = 0 ; models[i]; i++)
 836         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 837     return 1;
 838 }
 839
 840 void qemu_check_nic_model(NICInfo *nd, const char *model)
 841 {
 842     const char *models[2];
 843
 844     models[0] = model;
 845     models[1] = NULL;
 846
 847     if (qemu_show_nic_models(nd->model, models))
 848         exit(0);
 849     if (qemu_find_nic_model(nd, models, model) < 0)
 850         exit(1);
 851 }
 852
 853 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 854                         const char *default_model)
 855 {
 856     int i;
 857
 858     if (!nd->model)
 859         nd->model = g_strdup(default_model);
 860
 861     for (i = 0 ; models[i]; i++) {
 862         if (strcmp(nd->model, models[i]) == 0)
 863             return i;
 864     }
 865
 866     error_report("Unsupported NIC model: %s", nd->model);
 867     return -1;
 868 }
 869
 870 static int net_init_nic(const NetClientOptions *opts, const char *name,
 871                         NetClientState *peer, Error **errp)
 872 {
 873     int idx;
 874     NICInfo *nd;
 875     const NetLegacyNicOptions *nic;
 876
 877     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 878     nic = opts->nic;
 879
 880     idx = nic_get_free_idx();
 881     if (idx == -1 || nb_nics >= MAX_NICS) {
 882         error_setg(errp, "too many NICs");
 883         return -1;
 884     }
 885
 886     nd = &nd_table[idx];
 887
 888     memset(nd, 0, sizeof(*nd));
 889
 890     if (nic->has_netdev) {
 891         nd->netdev = qemu_find_netdev(nic->netdev);
 892         if (!nd->netdev) {
 893             error_setg(errp, "netdev '%s' not found", nic->netdev);
 894             return -1;
 895         }
 896     } else {
 897         assert(peer);
 898         nd->netdev = peer;
 899     }
 900     nd->name = g_strdup(name);
 901     if (nic->has_model) {
 902         nd->model = g_strdup(nic->model);
 903     }
 904     if (nic->has_addr) {
 905         nd->devaddr = g_strdup(nic->addr);
 906     }
 907
 908     if (nic->has_macaddr &&
 909         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 910         error_setg(errp, "invalid syntax for ethernet address");
 911         return -1;
 912     }
 913     if (nic->has_macaddr &&
 914         is_multicast_ether_addr(nd->macaddr.a)) {
 915         error_setg(errp,
 916                    "NIC cannot have multicast MAC address (odd 1st byte)");
 917         return -1;
 918     }
 919     qemu_macaddr_default_if_unset(&nd->macaddr);
 920
 921     if (nic->has_vectors) {
 922         if (nic->vectors > 0x7ffffff) {
 923             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 924             return -1;
 925         }
 926         nd->nvectors = nic->vectors;
 927     } else {
 928         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 929     }
 930
 931     nd->used = 1;
 932     nb_nics++;
 933
 934     return idx;
 935 }
 936
 937
 938 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 939     const NetClientOptions *opts,
 940     const char *name,
 941     NetClientState *peer, Error **errp) = {
 942         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 943 #ifdef CONFIG_SLIRP
 944         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 945 #endif
 946         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 947         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 948 #ifdef CONFIG_VDE
 949         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 950 #endif
 951 #ifdef CONFIG_NETMAP
 952         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 953 #endif
 954         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 955 #ifdef CONFIG_NET_BRIDGE
 956         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 957 #endif
 958         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 959 #ifdef CONFIG_VHOST_NET_USED
 960         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 961 #endif
 962 #ifdef CONFIG_L2TPV3
 963         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 964 #endif
 965 };
 966
 967
 968 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 969 {
 970     const NetClientOptions *opts;
 971     const char *name;
 972     NetClientState *peer = NULL;
 973
 974     if (is_netdev) {
 975         const Netdev *netdev = object;
 976         opts = netdev->opts;
 977         name = netdev->id;
 978
 979         if (opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP ||
 980             opts->kind == NET_CLIENT_OPTIONS_KIND_NIC ||
 981             !net_client_init_fun[opts->kind]) {
 982             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 983                        "a netdev backend type");
 984             return -1;
 985         }
 986     } else {
 987         const NetLegacy *net = object;
 988         opts = net->opts;
 989         /* missing optional values have been initialized to "all bits zero" */
 990         name = net->has_id ? net->id : net->name;
 991
 992         if (opts->kind == NET_CLIENT_OPTIONS_KIND_NONE) {
 993             return 0; /* nothing to do */
 994         }
 995         if (opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 996             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 997                        "a net type");
 998             return -1;
 999         }
1000
1001         if (!net_client_init_fun[opts->kind]) {
1002             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1003                        "a net backend type (maybe it is not compiled "
1004                        "into this binary)");
1005             return -1;
1006         }
1007
1008         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1009         if (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
1010             !opts->nic->has_netdev) {
1011             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1012         }
1013     }
1014
1015     if (net_client_init_fun[opts->kind](opts, name, peer, errp) < 0) {
1016         /* FIXME drop when all init functions store an Error */
1017         if (errp && !*errp) {
1018             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1019                        NetClientOptionsKind_lookup[opts->kind]);
1020         }
1021         return -1;
1022     }
1023     return 0;
1024 }
1025
1026
1027 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
1028 {
1029     if (is_netdev) {
1030         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
1031     } else {
1032         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
1033     }
1034 }
1035
1036
1037 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
1038 {
1039     void *object = NULL;
1040     Error *err = NULL;
1041     int ret = -1;
1042
1043     {
1044         OptsVisitor *ov = opts_visitor_new(opts);
1045
1046         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
1047         opts_visitor_cleanup(ov);
1048     }
1049
1050     if (!err) {
1051         ret = net_client_init1(object, is_netdev, &err);
1052     }
1053
1054     if (object) {
1055         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
1056
1057         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
1058         qapi_dealloc_visitor_cleanup(dv);
1059     }
1060
1061     error_propagate(errp, err);
1062     return ret;
1063 }
1064
1065
1066 static int net_host_check_device(const char *device)
1067 {
1068     int i;
1069     for (i = 0; host_net_devices[i]; i++) {
1070         if (!strncmp(host_net_devices[i], device,
1071                      strlen(host_net_devices[i]))) {
1072             return 1;
1073         }
1074     }
1075
1076     return 0;
1077 }
1078
1079 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1080 {
1081     const char *device = qdict_get_str(qdict, "device");
1082     const char *opts_str = qdict_get_try_str(qdict, "opts");
1083     Error *local_err = NULL;
1084     QemuOpts *opts;
1085
1086     if (!net_host_check_device(device)) {
1087         monitor_printf(mon, "invalid host network device %s\n", device);
1088         return;
1089     }
1090
1091     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1092                                    opts_str ? opts_str : "", false);
1093     if (!opts) {
1094         return;
1095     }
1096
1097     qemu_opt_set(opts, "type", device, &error_abort);
1098
1099     net_client_init(opts, 0, &local_err);
1100     if (local_err) {
1101         error_report_err(local_err);
1102         monitor_printf(mon, "adding host network device %s failed\n", device);
1103     }
1104 }
1105
1106 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1107 {
1108     NetClientState *nc;
1109     int vlan_id = qdict_get_int(qdict, "vlan_id");
1110     const char *device = qdict_get_str(qdict, "device");
1111
1112     nc = net_hub_find_client_by_name(vlan_id, device);
1113     if (!nc) {
1114         error_report("Host network device '%s' on hub '%d' not found",
1115                      device, vlan_id);
1116         return;
1117     }
1118     if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1119         error_report("invalid host network device '%s'", device);
1120         return;
1121     }
1122
1123     qemu_del_net_client(nc->peer);
1124     qemu_del_net_client(nc);
1125 }
1126
1127 void netdev_add(QemuOpts *opts, Error **errp)
1128 {
1129     net_client_init(opts, 1, errp);
1130 }
1131
1132 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1133 {
1134     Error *local_err = NULL;
1135     QemuOptsList *opts_list;
1136     QemuOpts *opts;
1137
1138     opts_list = qemu_find_opts_err("netdev", &local_err);
1139     if (local_err) {
1140         goto out;
1141     }
1142
1143     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1144     if (local_err) {
1145         goto out;
1146     }
1147
1148     netdev_add(opts, &local_err);
1149     if (local_err) {
1150         qemu_opts_del(opts);
1151         goto out;
1152     }
1153
1154 out:
1155     error_propagate(errp, local_err);
1156 }
1157
1158 void qmp_netdev_del(const char *id, Error **errp)
1159 {
1160     NetClientState *nc;
1161     QemuOpts *opts;
1162
1163     nc = qemu_find_netdev(id);
1164     if (!nc) {
1165         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1166                   "Device '%s' not found", id);
1167         return;
1168     }
1169
1170     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1171     if (!opts) {
1172         error_setg(errp, "Device '%s' is not a netdev", id);
1173         return;
1174     }
1175
1176     qemu_del_net_client(nc);
1177     qemu_opts_del(opts);
1178 }
1179
1180 void print_net_client(Monitor *mon, NetClientState *nc)
1181 {
1182     NetFilterState *nf;
1183
1184     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1185                    nc->queue_index,
1186                    NetClientOptionsKind_lookup[nc->info->type],
1187                    nc->info_str);
1188     if (!QTAILQ_EMPTY(&nc->filters)) {
1189         monitor_printf(mon, "filters:\n");
1190     }
1191     QTAILQ_FOREACH(nf, &nc->filters, next) {
1192         monitor_printf(mon, "  - %s: type=%s%s\n",
1193                        object_get_canonical_path_component(OBJECT(nf)),
1194                        object_get_typename(OBJECT(nf)),
1195                        nf->info_str);
1196     }
1197 }
1198
1199 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1200                                       Error **errp)
1201 {
1202     NetClientState *nc;
1203     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1204
1205     QTAILQ_FOREACH(nc, &net_clients, next) {
1206         RxFilterInfoList *entry;
1207         RxFilterInfo *info;
1208
1209         if (has_name && strcmp(nc->name, name) != 0) {
1210             continue;
1211         }
1212
1213         /* only query rx-filter information of NIC */
1214         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1215             if (has_name) {
1216                 error_setg(errp, "net client(%s) isn't a NIC", name);
1217                 return NULL;
1218             }
1219             continue;
1220         }
1221
1222         if (nc->info->query_rx_filter) {
1223             info = nc->info->query_rx_filter(nc);
1224             entry = g_malloc0(sizeof(*entry));
1225             entry->value = info;
1226
1227             if (!filter_list) {
1228                 filter_list = entry;
1229             } else {
1230                 last_entry->next = entry;
1231             }
1232             last_entry = entry;
1233         } else if (has_name) {
1234             error_setg(errp, "net client(%s) doesn't support"
1235                        " rx-filter querying", name);
1236             return NULL;
1237         }
1238
1239         if (has_name) {
1240             break;
1241         }
1242     }
1243
1244     if (filter_list == NULL && has_name) {
1245         error_setg(errp, "invalid net client name: %s", name);
1246     }
1247
1248     return filter_list;
1249 }
1250
1251 void hmp_info_network(Monitor *mon, const QDict *qdict)
1252 {
1253     NetClientState *nc, *peer;
1254     NetClientOptionsKind type;
1255
1256     net_hub_info(mon);
1257
1258     QTAILQ_FOREACH(nc, &net_clients, next) {
1259         peer = nc->peer;
1260         type = nc->info->type;
1261
1262         /* Skip if already printed in hub info */
1263         if (net_hub_id_for_client(nc, NULL) == 0) {
1264             continue;
1265         }
1266
1267         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1268             print_net_client(mon, nc);
1269         } /* else it's a netdev connected to a NIC, printed with the NIC */
1270         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1271             monitor_printf(mon, " \\ ");
1272             print_net_client(mon, peer);
1273         }
1274     }
1275 }
1276
1277 void qmp_set_link(const char *name, bool up, Error **errp)
1278 {
1279     NetClientState *ncs[MAX_QUEUE_NUM];
1280     NetClientState *nc;
1281     int queues, i;
1282
1283     queues = qemu_find_net_clients_except(name, ncs,
1284                                           NET_CLIENT_OPTIONS_KIND_MAX,
1285                                           MAX_QUEUE_NUM);
1286
1287     if (queues == 0) {
1288         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1289                   "Device '%s' not found", name);
1290         return;
1291     }
1292     nc = ncs[0];
1293
1294     for (i = 0; i < queues; i++) {
1295         ncs[i]->link_down = !up;
1296     }
1297
1298     if (nc->info->link_status_changed) {
1299         nc->info->link_status_changed(nc);
1300     }
1301
1302     if (nc->peer) {
1303         /* Change peer link only if the peer is NIC and then notify peer.
1304          * If the peer is a HUBPORT or a backend, we do not change the
1305          * link status.
1306          *
1307          * This behavior is compatible with qemu vlans where there could be
1308          * multiple clients that can still communicate with each other in
1309          * disconnected mode. For now maintain this compatibility.
1310          */
1311         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1312             for (i = 0; i < queues; i++) {
1313                 ncs[i]->peer->link_down = !up;
1314             }
1315         }
1316         if (nc->peer->info->link_status_changed) {
1317             nc->peer->info->link_status_changed(nc->peer);
1318         }
1319     }
1320 }
1321
1322 static void net_vm_change_state_handler(void *opaque, int running,
1323                                         RunState state)
1324 {
1325     NetClientState *nc;
1326     NetClientState *tmp;
1327
1328     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1329         if (running) {
1330             /* Flush queued packets and wake up backends. */
1331             if (nc->peer && qemu_can_send_packet(nc)) {
1332                 qemu_flush_queued_packets(nc->peer);
1333             }
1334         } else {
1335             /* Complete all queued packets, to guarantee we don't modify
1336              * state later when VM is not running.
1337              */
1338             qemu_flush_or_purge_queued_packets(nc, true);
1339         }
1340     }
1341 }
1342
1343 void net_cleanup(void)
1344 {
1345     NetClientState *nc;
1346
1347     /* We may del multiple entries during qemu_del_net_client(),
1348      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1349      */
1350     while (!QTAILQ_EMPTY(&net_clients)) {
1351         nc = QTAILQ_FIRST(&net_clients);
1352         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1353             qemu_del_nic(qemu_get_nic(nc));
1354         } else {
1355             qemu_del_net_client(nc);
1356         }
1357     }
1358
1359     qemu_del_vm_change_state_handler(net_change_state_entry);
1360 }
1361
1362 void net_check_clients(void)
1363 {
1364     NetClientState *nc;
1365     int i;
1366
1367     /* Don't warn about the default network setup that you get if
1368      * no command line -net or -netdev options are specified. There
1369      * are two cases that we would otherwise complain about:
1370      * (1) board doesn't support a NIC but the implicit "-net nic"
1371      * requested one
1372      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1373      * sets up a nic that isn't connected to anything.
1374      */
1375     if (default_net) {
1376         return;
1377     }
1378
1379     net_hub_check_clients();
1380
1381     QTAILQ_FOREACH(nc, &net_clients, next) {
1382         if (!nc->peer) {
1383             fprintf(stderr, "Warning: %s %s has no peer\n",
1384                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1385                     "nic" : "netdev", nc->name);
1386         }
1387     }
1388
1389     /* Check that all NICs requested via -net nic actually got created.
1390      * NICs created via -device don't need to be checked here because
1391      * they are always instantiated.
1392      */
1393     for (i = 0; i < MAX_NICS; i++) {
1394         NICInfo *nd = &nd_table[i];
1395         if (nd->used && !nd->instantiated) {
1396             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1397                     "was not created (not supported by this machine?)\n",
1398                     nd->name ? nd->name : "anonymous",
1399                     nd->model ? nd->model : "unspecified");
1400         }
1401     }
1402 }
1403
1404 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1405 {
1406     Error *local_err = NULL;
1407
1408     net_client_init(opts, 0, &local_err);
1409     if (local_err) {
1410         error_report_err(local_err);
1411         return -1;
1412     }
1413
1414     return 0;
1415 }
1416
1417 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1418 {
1419     Error *local_err = NULL;
1420     int ret;
1421
1422     ret = net_client_init(opts, 1, &local_err);
1423     if (local_err) {
1424         error_report_err(local_err);
1425         return -1;
1426     }
1427
1428     return ret;
1429 }
1430
1431 int net_init_clients(void)
1432 {
1433     QemuOptsList *net = qemu_find_opts("net");
1434
1435     if (default_net) {
1436         /* if no clients, we use a default config */
1437         qemu_opts_set(net, NULL, "type", "nic", &error_abort);
1438 #ifdef CONFIG_SLIRP
1439         qemu_opts_set(net, NULL, "type", "user", &error_abort);
1440 #endif
1441     }
1442
1443     net_change_state_entry =
1444         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1445
1446     QTAILQ_INIT(&net_clients);
1447
1448     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1449                           net_init_netdev, NULL, NULL)) {
1450         return -1;
1451     }
1452
1453     if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1454         return -1;
1455     }
1456
1457     return 0;
1458 }
1459
1460 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1461 {
1462 #if defined(CONFIG_SLIRP)
1463     int ret;
1464     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1465         return ret;
1466     }
1467 #endif
1468
1469     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1470         return -1;
1471     }
1472
1473     default_net = 0;
1474     return 0;
1475 }
1476
1477 /* From FreeBSD */
1478 /* XXX: optimize */
1479 unsigned compute_mcast_idx(const uint8_t *ep)
1480 {
1481     uint32_t crc;
1482     int carry, i, j;
1483     uint8_t b;
1484
1485     crc = 0xffffffff;
1486     for (i = 0; i < 6; i++) {
1487         b = *ep++;
1488         for (j = 0; j < 8; j++) {
1489             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1490             crc <<= 1;
1491             b >>= 1;
1492             if (carry) {
1493                 crc = ((crc ^ POLYNOMIAL) | carry);
1494             }
1495         }
1496     }
1497     return crc >> 26;
1498 }
1499
1500 QemuOptsList qemu_netdev_opts = {
1501     .name = "netdev",
1502     .implied_opt_name = "type",
1503     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1504     .desc = {
1505         /*
1506          * no elements => accept any params
1507          * validation will happen later
1508          */
1509         { /* end of list */ }
1510     },
1511 };
1512
1513 QemuOptsList qemu_net_opts = {
1514     .name = "net",
1515     .implied_opt_name = "type",
1516     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1517     .desc = {
1518         /*
1519          * no elements => accept any params
1520          * validation will happen later
1521          */
1522         { /* end of list */ }
1523     },
1524 };