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 #ifdef HOST_WORDS_BIGENDIAN
 528     if (!nc || !nc->info->set_vnet_le) {
 529         return -ENOSYS;
 530     }
 531
 532     return nc->info->set_vnet_le(nc, is_le);
 533 #else
 534     return 0;
 535 #endif
 536 }
 537
 538 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 539 {
 540 #ifdef HOST_WORDS_BIGENDIAN
 541     return 0;
 542 #else
 543     if (!nc || !nc->info->set_vnet_be) {
 544         return -ENOSYS;
 545     }
 546
 547     return nc->info->set_vnet_be(nc, is_be);
 548 #endif
 549 }
 550
 551 int qemu_can_send_packet(NetClientState *sender)
 552 {
 553     int vm_running = runstate_is_running();
 554
 555     if (!vm_running) {
 556         return 0;
 557     }
 558
 559     if (!sender->peer) {
 560         return 1;
 561     }
 562
 563     if (sender->peer->receive_disabled) {
 564         return 0;
 565     } else if (sender->peer->info->can_receive &&
 566                !sender->peer->info->can_receive(sender->peer)) {
 567         return 0;
 568     }
 569     return 1;
 570 }
 571
 572 static ssize_t filter_receive_iov(NetClientState *nc,
 573                                   NetFilterDirection direction,
 574                                   NetClientState *sender,
 575                                   unsigned flags,
 576                                   const struct iovec *iov,
 577                                   int iovcnt,
 578                                   NetPacketSent *sent_cb)
 579 {
 580     ssize_t ret = 0;
 581     NetFilterState *nf = NULL;
 582
 583     QTAILQ_FOREACH(nf, &nc->filters, next) {
 584         ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 585                                      iovcnt, sent_cb);
 586         if (ret) {
 587             return ret;
 588         }
 589     }
 590
 591     return ret;
 592 }
 593
 594 static ssize_t filter_receive(NetClientState *nc,
 595                               NetFilterDirection direction,
 596                               NetClientState *sender,
 597                               unsigned flags,
 598                               const uint8_t *data,
 599                               size_t size,
 600                               NetPacketSent *sent_cb)
 601 {
 602     struct iovec iov = {
 603         .iov_base = (void *)data,
 604         .iov_len = size
 605     };
 606
 607     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 608 }
 609
 610 void qemu_purge_queued_packets(NetClientState *nc)
 611 {
 612     if (!nc->peer) {
 613         return;
 614     }
 615
 616     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 617 }
 618
 619 static
 620 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 621 {
 622     nc->receive_disabled = 0;
 623
 624     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 625         if (net_hub_flush(nc->peer)) {
 626             qemu_notify_event();
 627         }
 628     }
 629     if (qemu_net_queue_flush(nc->incoming_queue)) {
 630         /* We emptied the queue successfully, signal to the IO thread to repoll
 631          * the file descriptor (for tap, for example).
 632          */
 633         qemu_notify_event();
 634     } else if (purge) {
 635         /* Unable to empty the queue, purge remaining packets */
 636         qemu_net_queue_purge(nc->incoming_queue, nc);
 637     }
 638 }
 639
 640 void qemu_flush_queued_packets(NetClientState *nc)
 641 {
 642     qemu_flush_or_purge_queued_packets(nc, false);
 643 }
 644
 645 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 646                                                  unsigned flags,
 647                                                  const uint8_t *buf, int size,
 648                                                  NetPacketSent *sent_cb)
 649 {
 650     NetQueue *queue;
 651     int ret;
 652
 653 #ifdef DEBUG_NET
 654     printf("qemu_send_packet_async:\n");
 655     hex_dump(stdout, buf, size);
 656 #endif
 657
 658     if (sender->link_down || !sender->peer) {
 659         return size;
 660     }
 661
 662     /* Let filters handle the packet first */
 663     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 664                          sender, flags, buf, size, sent_cb);
 665     if (ret) {
 666         return ret;
 667     }
 668
 669     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 670                          sender, flags, buf, size, sent_cb);
 671     if (ret) {
 672         return ret;
 673     }
 674
 675     queue = sender->peer->incoming_queue;
 676
 677     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 678 }
 679
 680 ssize_t qemu_send_packet_async(NetClientState *sender,
 681                                const uint8_t *buf, int size,
 682                                NetPacketSent *sent_cb)
 683 {
 684     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 685                                              buf, size, sent_cb);
 686 }
 687
 688 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 689 {
 690     qemu_send_packet_async(nc, buf, size, NULL);
 691 }
 692
 693 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 694 {
 695     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 696                                              buf, size, NULL);
 697 }
 698
 699 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 700                                int iovcnt, unsigned flags)
 701 {
 702     uint8_t buf[NET_BUFSIZE];
 703     uint8_t *buffer;
 704     size_t offset;
 705
 706     if (iovcnt == 1) {
 707         buffer = iov[0].iov_base;
 708         offset = iov[0].iov_len;
 709     } else {
 710         buffer = buf;
 711         offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 712     }
 713
 714     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 715         return nc->info->receive_raw(nc, buffer, offset);
 716     } else {
 717         return nc->info->receive(nc, buffer, offset);
 718     }
 719 }
 720
 721 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 722                                 unsigned flags,
 723                                 const struct iovec *iov,
 724                                 int iovcnt,
 725                                 void *opaque)
 726 {
 727     NetClientState *nc = opaque;
 728     int ret;
 729
 730     if (nc->link_down) {
 731         return iov_size(iov, iovcnt);
 732     }
 733
 734     if (nc->receive_disabled) {
 735         return 0;
 736     }
 737
 738     if (nc->info->receive_iov) {
 739         ret = nc->info->receive_iov(nc, iov, iovcnt);
 740     } else {
 741         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 742     }
 743
 744     if (ret == 0) {
 745         nc->receive_disabled = 1;
 746     }
 747
 748     return ret;
 749 }
 750
 751 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 752                                 const struct iovec *iov, int iovcnt,
 753                                 NetPacketSent *sent_cb)
 754 {
 755     NetQueue *queue;
 756     int ret;
 757
 758     if (sender->link_down || !sender->peer) {
 759         return iov_size(iov, iovcnt);
 760     }
 761
 762     /* Let filters handle the packet first */
 763     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 764                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 765     if (ret) {
 766         return ret;
 767     }
 768
 769     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 770                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 771     if (ret) {
 772         return ret;
 773     }
 774
 775     queue = sender->peer->incoming_queue;
 776
 777     return qemu_net_queue_send_iov(queue, sender,
 778                                    QEMU_NET_PACKET_FLAG_NONE,
 779                                    iov, iovcnt, sent_cb);
 780 }
 781
 782 ssize_t
 783 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 784 {
 785     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 786 }
 787
 788 NetClientState *qemu_find_netdev(const char *id)
 789 {
 790     NetClientState *nc;
 791
 792     QTAILQ_FOREACH(nc, &net_clients, next) {
 793         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 794             continue;
 795         if (!strcmp(nc->name, id)) {
 796             return nc;
 797         }
 798     }
 799
 800     return NULL;
 801 }
 802
 803 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 804                                  NetClientOptionsKind type, int max)
 805 {
 806     NetClientState *nc;
 807     int ret = 0;
 808
 809     QTAILQ_FOREACH(nc, &net_clients, next) {
 810         if (nc->info->type == type) {
 811             continue;
 812         }
 813         if (!id || !strcmp(nc->name, id)) {
 814             if (ret < max) {
 815                 ncs[ret] = nc;
 816             }
 817             ret++;
 818         }
 819     }
 820
 821     return ret;
 822 }
 823
 824 static int nic_get_free_idx(void)
 825 {
 826     int index;
 827
 828     for (index = 0; index < MAX_NICS; index++)
 829         if (!nd_table[index].used)
 830             return index;
 831     return -1;
 832 }
 833
 834 int qemu_show_nic_models(const char *arg, const char *const *models)
 835 {
 836     int i;
 837
 838     if (!arg || !is_help_option(arg)) {
 839         return 0;
 840     }
 841
 842     fprintf(stderr, "qemu: Supported NIC models: ");
 843     for (i = 0 ; models[i]; i++)
 844         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 845     return 1;
 846 }
 847
 848 void qemu_check_nic_model(NICInfo *nd, const char *model)
 849 {
 850     const char *models[2];
 851
 852     models[0] = model;
 853     models[1] = NULL;
 854
 855     if (qemu_show_nic_models(nd->model, models))
 856         exit(0);
 857     if (qemu_find_nic_model(nd, models, model) < 0)
 858         exit(1);
 859 }
 860
 861 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 862                         const char *default_model)
 863 {
 864     int i;
 865
 866     if (!nd->model)
 867         nd->model = g_strdup(default_model);
 868
 869     for (i = 0 ; models[i]; i++) {
 870         if (strcmp(nd->model, models[i]) == 0)
 871             return i;
 872     }
 873
 874     error_report("Unsupported NIC model: %s", nd->model);
 875     return -1;
 876 }
 877
 878 static int net_init_nic(const NetClientOptions *opts, const char *name,
 879                         NetClientState *peer, Error **errp)
 880 {
 881     int idx;
 882     NICInfo *nd;
 883     const NetLegacyNicOptions *nic;
 884
 885     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 886     nic = opts->nic;
 887
 888     idx = nic_get_free_idx();
 889     if (idx == -1 || nb_nics >= MAX_NICS) {
 890         error_setg(errp, "too many NICs");
 891         return -1;
 892     }
 893
 894     nd = &nd_table[idx];
 895
 896     memset(nd, 0, sizeof(*nd));
 897
 898     if (nic->has_netdev) {
 899         nd->netdev = qemu_find_netdev(nic->netdev);
 900         if (!nd->netdev) {
 901             error_setg(errp, "netdev '%s' not found", nic->netdev);
 902             return -1;
 903         }
 904     } else {
 905         assert(peer);
 906         nd->netdev = peer;
 907     }
 908     nd->name = g_strdup(name);
 909     if (nic->has_model) {
 910         nd->model = g_strdup(nic->model);
 911     }
 912     if (nic->has_addr) {
 913         nd->devaddr = g_strdup(nic->addr);
 914     }
 915
 916     if (nic->has_macaddr &&
 917         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 918         error_setg(errp, "invalid syntax for ethernet address");
 919         return -1;
 920     }
 921     if (nic->has_macaddr &&
 922         is_multicast_ether_addr(nd->macaddr.a)) {
 923         error_setg(errp,
 924                    "NIC cannot have multicast MAC address (odd 1st byte)");
 925         return -1;
 926     }
 927     qemu_macaddr_default_if_unset(&nd->macaddr);
 928
 929     if (nic->has_vectors) {
 930         if (nic->vectors > 0x7ffffff) {
 931             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 932             return -1;
 933         }
 934         nd->nvectors = nic->vectors;
 935     } else {
 936         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 937     }
 938
 939     nd->used = 1;
 940     nb_nics++;
 941
 942     return idx;
 943 }
 944
 945
 946 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 947     const NetClientOptions *opts,
 948     const char *name,
 949     NetClientState *peer, Error **errp) = {
 950         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 951 #ifdef CONFIG_SLIRP
 952         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 953 #endif
 954         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 955         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 956 #ifdef CONFIG_VDE
 957         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 958 #endif
 959 #ifdef CONFIG_NETMAP
 960         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 961 #endif
 962         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 963 #ifdef CONFIG_NET_BRIDGE
 964         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 965 #endif
 966         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 967 #ifdef CONFIG_VHOST_NET_USED
 968         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 969 #endif
 970 #ifdef CONFIG_L2TPV3
 971         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 972 #endif
 973 };
 974
 975
 976 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 977 {
 978     const NetClientOptions *opts;
 979     const char *name;
 980     NetClientState *peer = NULL;
 981
 982     if (is_netdev) {
 983         const Netdev *netdev = object;
 984         opts = netdev->opts;
 985         name = netdev->id;
 986
 987         if (opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP ||
 988             opts->kind == NET_CLIENT_OPTIONS_KIND_NIC ||
 989             !net_client_init_fun[opts->kind]) {
 990             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 991                        "a netdev backend type");
 992             return -1;
 993         }
 994     } else {
 995         const NetLegacy *net = object;
 996         opts = net->opts;
 997         /* missing optional values have been initialized to "all bits zero" */
 998         name = net->has_id ? net->id : net->name;
 999
1000         if (opts->kind == NET_CLIENT_OPTIONS_KIND_NONE) {
1001             return 0; /* nothing to do */
1002         }
1003         if (opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
1004             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1005                        "a net type");
1006             return -1;
1007         }
1008
1009         if (!net_client_init_fun[opts->kind]) {
1010             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1011                        "a net backend type (maybe it is not compiled "
1012                        "into this binary)");
1013             return -1;
1014         }
1015
1016         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1017         if (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
1018             !opts->nic->has_netdev) {
1019             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1020         }
1021     }
1022
1023     if (net_client_init_fun[opts->kind](opts, name, peer, errp) < 0) {
1024         /* FIXME drop when all init functions store an Error */
1025         if (errp && !*errp) {
1026             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1027                        NetClientOptionsKind_lookup[opts->kind]);
1028         }
1029         return -1;
1030     }
1031     return 0;
1032 }
1033
1034
1035 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
1036 {
1037     if (is_netdev) {
1038         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
1039     } else {
1040         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
1041     }
1042 }
1043
1044
1045 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
1046 {
1047     void *object = NULL;
1048     Error *err = NULL;
1049     int ret = -1;
1050
1051     {
1052         OptsVisitor *ov = opts_visitor_new(opts);
1053
1054         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
1055         opts_visitor_cleanup(ov);
1056     }
1057
1058     if (!err) {
1059         ret = net_client_init1(object, is_netdev, &err);
1060     }
1061
1062     if (object) {
1063         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
1064
1065         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
1066         qapi_dealloc_visitor_cleanup(dv);
1067     }
1068
1069     error_propagate(errp, err);
1070     return ret;
1071 }
1072
1073
1074 static int net_host_check_device(const char *device)
1075 {
1076     int i;
1077     for (i = 0; host_net_devices[i]; i++) {
1078         if (!strncmp(host_net_devices[i], device,
1079                      strlen(host_net_devices[i]))) {
1080             return 1;
1081         }
1082     }
1083
1084     return 0;
1085 }
1086
1087 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1088 {
1089     const char *device = qdict_get_str(qdict, "device");
1090     const char *opts_str = qdict_get_try_str(qdict, "opts");
1091     Error *local_err = NULL;
1092     QemuOpts *opts;
1093
1094     if (!net_host_check_device(device)) {
1095         monitor_printf(mon, "invalid host network device %s\n", device);
1096         return;
1097     }
1098
1099     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1100                                    opts_str ? opts_str : "", false);
1101     if (!opts) {
1102         return;
1103     }
1104
1105     qemu_opt_set(opts, "type", device, &error_abort);
1106
1107     net_client_init(opts, 0, &local_err);
1108     if (local_err) {
1109         error_report_err(local_err);
1110         monitor_printf(mon, "adding host network device %s failed\n", device);
1111     }
1112 }
1113
1114 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1115 {
1116     NetClientState *nc;
1117     int vlan_id = qdict_get_int(qdict, "vlan_id");
1118     const char *device = qdict_get_str(qdict, "device");
1119
1120     nc = net_hub_find_client_by_name(vlan_id, device);
1121     if (!nc) {
1122         error_report("Host network device '%s' on hub '%d' not found",
1123                      device, vlan_id);
1124         return;
1125     }
1126     if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1127         error_report("invalid host network device '%s'", device);
1128         return;
1129     }
1130
1131     qemu_del_net_client(nc->peer);
1132     qemu_del_net_client(nc);
1133 }
1134
1135 void netdev_add(QemuOpts *opts, Error **errp)
1136 {
1137     net_client_init(opts, 1, errp);
1138 }
1139
1140 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1141 {
1142     Error *local_err = NULL;
1143     QemuOptsList *opts_list;
1144     QemuOpts *opts;
1145
1146     opts_list = qemu_find_opts_err("netdev", &local_err);
1147     if (local_err) {
1148         goto out;
1149     }
1150
1151     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1152     if (local_err) {
1153         goto out;
1154     }
1155
1156     netdev_add(opts, &local_err);
1157     if (local_err) {
1158         qemu_opts_del(opts);
1159         goto out;
1160     }
1161
1162 out:
1163     error_propagate(errp, local_err);
1164 }
1165
1166 void qmp_netdev_del(const char *id, Error **errp)
1167 {
1168     NetClientState *nc;
1169     QemuOpts *opts;
1170
1171     nc = qemu_find_netdev(id);
1172     if (!nc) {
1173         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1174                   "Device '%s' not found", id);
1175         return;
1176     }
1177
1178     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1179     if (!opts) {
1180         error_setg(errp, "Device '%s' is not a netdev", id);
1181         return;
1182     }
1183
1184     qemu_del_net_client(nc);
1185     qemu_opts_del(opts);
1186 }
1187
1188 void print_net_client(Monitor *mon, NetClientState *nc)
1189 {
1190     NetFilterState *nf;
1191
1192     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1193                    nc->queue_index,
1194                    NetClientOptionsKind_lookup[nc->info->type],
1195                    nc->info_str);
1196     if (!QTAILQ_EMPTY(&nc->filters)) {
1197         monitor_printf(mon, "filters:\n");
1198     }
1199     QTAILQ_FOREACH(nf, &nc->filters, next) {
1200         monitor_printf(mon, "  - %s: type=%s%s\n",
1201                        object_get_canonical_path_component(OBJECT(nf)),
1202                        object_get_typename(OBJECT(nf)),
1203                        nf->info_str);
1204     }
1205 }
1206
1207 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1208                                       Error **errp)
1209 {
1210     NetClientState *nc;
1211     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1212
1213     QTAILQ_FOREACH(nc, &net_clients, next) {
1214         RxFilterInfoList *entry;
1215         RxFilterInfo *info;
1216
1217         if (has_name && strcmp(nc->name, name) != 0) {
1218             continue;
1219         }
1220
1221         /* only query rx-filter information of NIC */
1222         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1223             if (has_name) {
1224                 error_setg(errp, "net client(%s) isn't a NIC", name);
1225                 return NULL;
1226             }
1227             continue;
1228         }
1229
1230         if (nc->info->query_rx_filter) {
1231             info = nc->info->query_rx_filter(nc);
1232             entry = g_malloc0(sizeof(*entry));
1233             entry->value = info;
1234
1235             if (!filter_list) {
1236                 filter_list = entry;
1237             } else {
1238                 last_entry->next = entry;
1239             }
1240             last_entry = entry;
1241         } else if (has_name) {
1242             error_setg(errp, "net client(%s) doesn't support"
1243                        " rx-filter querying", name);
1244             return NULL;
1245         }
1246
1247         if (has_name) {
1248             break;
1249         }
1250     }
1251
1252     if (filter_list == NULL && has_name) {
1253         error_setg(errp, "invalid net client name: %s", name);
1254     }
1255
1256     return filter_list;
1257 }
1258
1259 void hmp_info_network(Monitor *mon, const QDict *qdict)
1260 {
1261     NetClientState *nc, *peer;
1262     NetClientOptionsKind type;
1263
1264     net_hub_info(mon);
1265
1266     QTAILQ_FOREACH(nc, &net_clients, next) {
1267         peer = nc->peer;
1268         type = nc->info->type;
1269
1270         /* Skip if already printed in hub info */
1271         if (net_hub_id_for_client(nc, NULL) == 0) {
1272             continue;
1273         }
1274
1275         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1276             print_net_client(mon, nc);
1277         } /* else it's a netdev connected to a NIC, printed with the NIC */
1278         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1279             monitor_printf(mon, " \\ ");
1280             print_net_client(mon, peer);
1281         }
1282     }
1283 }
1284
1285 void qmp_set_link(const char *name, bool up, Error **errp)
1286 {
1287     NetClientState *ncs[MAX_QUEUE_NUM];
1288     NetClientState *nc;
1289     int queues, i;
1290
1291     queues = qemu_find_net_clients_except(name, ncs,
1292                                           NET_CLIENT_OPTIONS_KIND_MAX,
1293                                           MAX_QUEUE_NUM);
1294
1295     if (queues == 0) {
1296         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1297                   "Device '%s' not found", name);
1298         return;
1299     }
1300     nc = ncs[0];
1301
1302     for (i = 0; i < queues; i++) {
1303         ncs[i]->link_down = !up;
1304     }
1305
1306     if (nc->info->link_status_changed) {
1307         nc->info->link_status_changed(nc);
1308     }
1309
1310     if (nc->peer) {
1311         /* Change peer link only if the peer is NIC and then notify peer.
1312          * If the peer is a HUBPORT or a backend, we do not change the
1313          * link status.
1314          *
1315          * This behavior is compatible with qemu vlans where there could be
1316          * multiple clients that can still communicate with each other in
1317          * disconnected mode. For now maintain this compatibility.
1318          */
1319         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1320             for (i = 0; i < queues; i++) {
1321                 ncs[i]->peer->link_down = !up;
1322             }
1323         }
1324         if (nc->peer->info->link_status_changed) {
1325             nc->peer->info->link_status_changed(nc->peer);
1326         }
1327     }
1328 }
1329
1330 static void net_vm_change_state_handler(void *opaque, int running,
1331                                         RunState state)
1332 {
1333     NetClientState *nc;
1334     NetClientState *tmp;
1335
1336     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1337         if (running) {
1338             /* Flush queued packets and wake up backends. */
1339             if (nc->peer && qemu_can_send_packet(nc)) {
1340                 qemu_flush_queued_packets(nc->peer);
1341             }
1342         } else {
1343             /* Complete all queued packets, to guarantee we don't modify
1344              * state later when VM is not running.
1345              */
1346             qemu_flush_or_purge_queued_packets(nc, true);
1347         }
1348     }
1349 }
1350
1351 void net_cleanup(void)
1352 {
1353     NetClientState *nc;
1354
1355     /* We may del multiple entries during qemu_del_net_client(),
1356      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1357      */
1358     while (!QTAILQ_EMPTY(&net_clients)) {
1359         nc = QTAILQ_FIRST(&net_clients);
1360         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1361             qemu_del_nic(qemu_get_nic(nc));
1362         } else {
1363             qemu_del_net_client(nc);
1364         }
1365     }
1366
1367     qemu_del_vm_change_state_handler(net_change_state_entry);
1368 }
1369
1370 void net_check_clients(void)
1371 {
1372     NetClientState *nc;
1373     int i;
1374
1375     /* Don't warn about the default network setup that you get if
1376      * no command line -net or -netdev options are specified. There
1377      * are two cases that we would otherwise complain about:
1378      * (1) board doesn't support a NIC but the implicit "-net nic"
1379      * requested one
1380      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1381      * sets up a nic that isn't connected to anything.
1382      */
1383     if (default_net) {
1384         return;
1385     }
1386
1387     net_hub_check_clients();
1388
1389     QTAILQ_FOREACH(nc, &net_clients, next) {
1390         if (!nc->peer) {
1391             fprintf(stderr, "Warning: %s %s has no peer\n",
1392                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1393                     "nic" : "netdev", nc->name);
1394         }
1395     }
1396
1397     /* Check that all NICs requested via -net nic actually got created.
1398      * NICs created via -device don't need to be checked here because
1399      * they are always instantiated.
1400      */
1401     for (i = 0; i < MAX_NICS; i++) {
1402         NICInfo *nd = &nd_table[i];
1403         if (nd->used && !nd->instantiated) {
1404             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1405                     "was not created (not supported by this machine?)\n",
1406                     nd->name ? nd->name : "anonymous",
1407                     nd->model ? nd->model : "unspecified");
1408         }
1409     }
1410 }
1411
1412 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1413 {
1414     Error *local_err = NULL;
1415
1416     net_client_init(opts, 0, &local_err);
1417     if (local_err) {
1418         error_report_err(local_err);
1419         return -1;
1420     }
1421
1422     return 0;
1423 }
1424
1425 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1426 {
1427     Error *local_err = NULL;
1428     int ret;
1429
1430     ret = net_client_init(opts, 1, &local_err);
1431     if (local_err) {
1432         error_report_err(local_err);
1433         return -1;
1434     }
1435
1436     return ret;
1437 }
1438
1439 int net_init_clients(void)
1440 {
1441     QemuOptsList *net = qemu_find_opts("net");
1442
1443     if (default_net) {
1444         /* if no clients, we use a default config */
1445         qemu_opts_set(net, NULL, "type", "nic", &error_abort);
1446 #ifdef CONFIG_SLIRP
1447         qemu_opts_set(net, NULL, "type", "user", &error_abort);
1448 #endif
1449     }
1450
1451     net_change_state_entry =
1452         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1453
1454     QTAILQ_INIT(&net_clients);
1455
1456     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1457                           net_init_netdev, NULL, NULL)) {
1458         return -1;
1459     }
1460
1461     if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1462         return -1;
1463     }
1464
1465     return 0;
1466 }
1467
1468 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1469 {
1470 #if defined(CONFIG_SLIRP)
1471     int ret;
1472     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1473         return ret;
1474     }
1475 #endif
1476
1477     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1478         return -1;
1479     }
1480
1481     default_net = 0;
1482     return 0;
1483 }
1484
1485 /* From FreeBSD */
1486 /* XXX: optimize */
1487 unsigned compute_mcast_idx(const uint8_t *ep)
1488 {
1489     uint32_t crc;
1490     int carry, i, j;
1491     uint8_t b;
1492
1493     crc = 0xffffffff;
1494     for (i = 0; i < 6; i++) {
1495         b = *ep++;
1496         for (j = 0; j < 8; j++) {
1497             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1498             crc <<= 1;
1499             b >>= 1;
1500             if (carry) {
1501                 crc = ((crc ^ POLYNOMIAL) | carry);
1502             }
1503         }
1504     }
1505     return crc >> 26;
1506 }
1507
1508 QemuOptsList qemu_netdev_opts = {
1509     .name = "netdev",
1510     .implied_opt_name = "type",
1511     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1512     .desc = {
1513         /*
1514          * no elements => accept any params
1515          * validation will happen later
1516          */
1517         { /* end of list */ }
1518     },
1519 };
1520
1521 QemuOptsList qemu_net_opts = {
1522     .name = "net",
1523     .implied_opt_name = "type",
1524     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1525     .desc = {
1526         /*
1527          * no elements => accept any params
1528          * validation will happen later
1529          */
1530         { /* end of list */ }
1531     },
1532 };