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 "qemu/osdep.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 #include "qapi/string-output-visitor.h"
  49
  50 /* Net bridge is currently not supported for W32. */
  51 #if !defined(_WIN32)
  52 # define CONFIG_NET_BRIDGE
  53 #endif
  54
  55 static VMChangeStateEntry *net_change_state_entry;
  56 static QTAILQ_HEAD(, NetClientState) net_clients;
  57
  58 const char *host_net_devices[] = {
  59     "tap",
  60     "socket",
  61     "dump",
  62 #ifdef CONFIG_NET_BRIDGE
  63     "bridge",
  64 #endif
  65 #ifdef CONFIG_NETMAP
  66     "netmap",
  67 #endif
  68 #ifdef CONFIG_SLIRP
  69     "user",
  70 #endif
  71 #ifdef CONFIG_VDE
  72     "vde",
  73 #endif
  74     "vhost-user",
  75     NULL,
  76 };
  77
  78 int default_net = 1;
  79
  80 /***********************************************************/
  81 /* network device redirectors */
  82
  83 #if defined(DEBUG_NET)
  84 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  85 {
  86     int len, i, j, c;
  87
  88     for(i=0;i<size;i+=16) {
  89         len = size - i;
  90         if (len > 16)
  91             len = 16;
  92         fprintf(f, "%08x ", i);
  93         for(j=0;j<16;j++) {
  94             if (j < len)
  95                 fprintf(f, " %02x", buf[i+j]);
  96             else
  97                 fprintf(f, "   ");
  98         }
  99         fprintf(f, " ");
 100         for(j=0;j<len;j++) {
 101             c = buf[i+j];
 102             if (c < ' ' || c > '~')
 103                 c = '.';
 104             fprintf(f, "%c", c);
 105         }
 106         fprintf(f, "\n");
 107     }
 108 }
 109 #endif
 110
 111 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
 112 {
 113     const char *p, *p1;
 114     int len;
 115     p = *pp;
 116     p1 = strchr(p, sep);
 117     if (!p1)
 118         return -1;
 119     len = p1 - p;
 120     p1++;
 121     if (buf_size > 0) {
 122         if (len > buf_size - 1)
 123             len = buf_size - 1;
 124         memcpy(buf, p, len);
 125         buf[len] = '\0';
 126     }
 127     *pp = p1;
 128     return 0;
 129 }
 130
 131 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 132 {
 133     char buf[512];
 134     struct hostent *he;
 135     const char *p, *r;
 136     int port;
 137
 138     p = str;
 139     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 140         return -1;
 141     saddr->sin_family = AF_INET;
 142     if (buf[0] == '\0') {
 143         saddr->sin_addr.s_addr = 0;
 144     } else {
 145         if (qemu_isdigit(buf[0])) {
 146             if (!inet_aton(buf, &saddr->sin_addr))
 147                 return -1;
 148         } else {
 149             if ((he = gethostbyname(buf)) == NULL)
 150                 return - 1;
 151             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 152         }
 153     }
 154     port = strtol(p, (char **)&r, 0);
 155     if (r == p)
 156         return -1;
 157     saddr->sin_port = htons(port);
 158     return 0;
 159 }
 160
 161 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 162 {
 163     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 164                            macaddr[0], macaddr[1], macaddr[2],
 165                            macaddr[3], macaddr[4], macaddr[5]);
 166 }
 167
 168 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 169 {
 170     snprintf(nc->info_str, sizeof(nc->info_str),
 171              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 172              nc->model,
 173              macaddr[0], macaddr[1], macaddr[2],
 174              macaddr[3], macaddr[4], macaddr[5]);
 175 }
 176
 177 static int mac_table[256] = {0};
 178
 179 static void qemu_macaddr_set_used(MACAddr *macaddr)
 180 {
 181     int index;
 182
 183     for (index = 0x56; index < 0xFF; index++) {
 184         if (macaddr->a[5] == index) {
 185             mac_table[index]++;
 186         }
 187     }
 188 }
 189
 190 static void qemu_macaddr_set_free(MACAddr *macaddr)
 191 {
 192     int index;
 193     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 194
 195     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 196         return;
 197     }
 198     for (index = 0x56; index < 0xFF; index++) {
 199         if (macaddr->a[5] == index) {
 200             mac_table[index]--;
 201         }
 202     }
 203 }
 204
 205 static int qemu_macaddr_get_free(void)
 206 {
 207     int index;
 208
 209     for (index = 0x56; index < 0xFF; index++) {
 210         if (mac_table[index] == 0) {
 211             return index;
 212         }
 213     }
 214
 215     return -1;
 216 }
 217
 218 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 219 {
 220     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 221     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 222
 223     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 224         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 225             return;
 226         } else {
 227             qemu_macaddr_set_used(macaddr);
 228             return;
 229         }
 230     }
 231
 232     macaddr->a[0] = 0x52;
 233     macaddr->a[1] = 0x54;
 234     macaddr->a[2] = 0x00;
 235     macaddr->a[3] = 0x12;
 236     macaddr->a[4] = 0x34;
 237     macaddr->a[5] = qemu_macaddr_get_free();
 238     qemu_macaddr_set_used(macaddr);
 239 }
 240
 241 /**
 242  * Generate a name for net client
 243  *
 244  * Only net clients created with the legacy -net option and NICs need this.
 245  */
 246 static char *assign_name(NetClientState *nc1, const char *model)
 247 {
 248     NetClientState *nc;
 249     int id = 0;
 250
 251     QTAILQ_FOREACH(nc, &net_clients, next) {
 252         if (nc == nc1) {
 253             continue;
 254         }
 255         if (strcmp(nc->model, model) == 0) {
 256             id++;
 257         }
 258     }
 259
 260     return g_strdup_printf("%s.%d", model, id);
 261 }
 262
 263 static void qemu_net_client_destructor(NetClientState *nc)
 264 {
 265     g_free(nc);
 266 }
 267
 268 static void qemu_net_client_setup(NetClientState *nc,
 269                                   NetClientInfo *info,
 270                                   NetClientState *peer,
 271                                   const char *model,
 272                                   const char *name,
 273                                   NetClientDestructor *destructor)
 274 {
 275     nc->info = info;
 276     nc->model = g_strdup(model);
 277     if (name) {
 278         nc->name = g_strdup(name);
 279     } else {
 280         nc->name = assign_name(nc, model);
 281     }
 282
 283     if (peer) {
 284         assert(!peer->peer);
 285         nc->peer = peer;
 286         peer->peer = nc;
 287     }
 288     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 289
 290     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 291     nc->destructor = destructor;
 292     QTAILQ_INIT(&nc->filters);
 293 }
 294
 295 NetClientState *qemu_new_net_client(NetClientInfo *info,
 296                                     NetClientState *peer,
 297                                     const char *model,
 298                                     const char *name)
 299 {
 300     NetClientState *nc;
 301
 302     assert(info->size >= sizeof(NetClientState));
 303
 304     nc = g_malloc0(info->size);
 305     qemu_net_client_setup(nc, info, peer, model, name,
 306                           qemu_net_client_destructor);
 307
 308     return nc;
 309 }
 310
 311 NICState *qemu_new_nic(NetClientInfo *info,
 312                        NICConf *conf,
 313                        const char *model,
 314                        const char *name,
 315                        void *opaque)
 316 {
 317     NetClientState **peers = conf->peers.ncs;
 318     NICState *nic;
 319     int i, queues = MAX(1, conf->peers.queues);
 320
 321     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 322     assert(info->size >= sizeof(NICState));
 323
 324     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 325     nic->ncs = (void *)nic + info->size;
 326     nic->conf = conf;
 327     nic->opaque = opaque;
 328
 329     for (i = 0; i < queues; i++) {
 330         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 331                               NULL);
 332         nic->ncs[i].queue_index = i;
 333     }
 334
 335     return nic;
 336 }
 337
 338 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 339 {
 340     return nic->ncs + queue_index;
 341 }
 342
 343 NetClientState *qemu_get_queue(NICState *nic)
 344 {
 345     return qemu_get_subqueue(nic, 0);
 346 }
 347
 348 NICState *qemu_get_nic(NetClientState *nc)
 349 {
 350     NetClientState *nc0 = nc - nc->queue_index;
 351
 352     return (NICState *)((void *)nc0 - nc->info->size);
 353 }
 354
 355 void *qemu_get_nic_opaque(NetClientState *nc)
 356 {
 357     NICState *nic = qemu_get_nic(nc);
 358
 359     return nic->opaque;
 360 }
 361
 362 static void qemu_cleanup_net_client(NetClientState *nc)
 363 {
 364     QTAILQ_REMOVE(&net_clients, nc, next);
 365
 366     if (nc->info->cleanup) {
 367         nc->info->cleanup(nc);
 368     }
 369 }
 370
 371 static void qemu_free_net_client(NetClientState *nc)
 372 {
 373     if (nc->incoming_queue) {
 374         qemu_del_net_queue(nc->incoming_queue);
 375     }
 376     if (nc->peer) {
 377         nc->peer->peer = NULL;
 378     }
 379     g_free(nc->name);
 380     g_free(nc->model);
 381     if (nc->destructor) {
 382         nc->destructor(nc);
 383     }
 384 }
 385
 386 void qemu_del_net_client(NetClientState *nc)
 387 {
 388     NetClientState *ncs[MAX_QUEUE_NUM];
 389     int queues, i;
 390     NetFilterState *nf, *next;
 391
 392     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 393
 394     /* If the NetClientState belongs to a multiqueue backend, we will change all
 395      * other NetClientStates also.
 396      */
 397     queues = qemu_find_net_clients_except(nc->name, ncs,
 398                                           NET_CLIENT_OPTIONS_KIND_NIC,
 399                                           MAX_QUEUE_NUM);
 400     assert(queues != 0);
 401
 402     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 403         object_unparent(OBJECT(nf));
 404     }
 405
 406     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 407     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 408         NICState *nic = qemu_get_nic(nc->peer);
 409         if (nic->peer_deleted) {
 410             return;
 411         }
 412         nic->peer_deleted = true;
 413
 414         for (i = 0; i < queues; i++) {
 415             ncs[i]->peer->link_down = true;
 416         }
 417
 418         if (nc->peer->info->link_status_changed) {
 419             nc->peer->info->link_status_changed(nc->peer);
 420         }
 421
 422         for (i = 0; i < queues; i++) {
 423             qemu_cleanup_net_client(ncs[i]);
 424         }
 425
 426         return;
 427     }
 428
 429     for (i = 0; i < queues; i++) {
 430         qemu_cleanup_net_client(ncs[i]);
 431         qemu_free_net_client(ncs[i]);
 432     }
 433 }
 434
 435 void qemu_del_nic(NICState *nic)
 436 {
 437     int i, queues = MAX(nic->conf->peers.queues, 1);
 438
 439     qemu_macaddr_set_free(&nic->conf->macaddr);
 440
 441     /* If this is a peer NIC and peer has already been deleted, free it now. */
 442     if (nic->peer_deleted) {
 443         for (i = 0; i < queues; i++) {
 444             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 445         }
 446     }
 447
 448     for (i = queues - 1; i >= 0; i--) {
 449         NetClientState *nc = qemu_get_subqueue(nic, i);
 450
 451         qemu_cleanup_net_client(nc);
 452         qemu_free_net_client(nc);
 453     }
 454
 455     g_free(nic);
 456 }
 457
 458 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 459 {
 460     NetClientState *nc;
 461
 462     QTAILQ_FOREACH(nc, &net_clients, next) {
 463         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 464             if (nc->queue_index == 0) {
 465                 func(qemu_get_nic(nc), opaque);
 466             }
 467         }
 468     }
 469 }
 470
 471 bool qemu_has_ufo(NetClientState *nc)
 472 {
 473     if (!nc || !nc->info->has_ufo) {
 474         return false;
 475     }
 476
 477     return nc->info->has_ufo(nc);
 478 }
 479
 480 bool qemu_has_vnet_hdr(NetClientState *nc)
 481 {
 482     if (!nc || !nc->info->has_vnet_hdr) {
 483         return false;
 484     }
 485
 486     return nc->info->has_vnet_hdr(nc);
 487 }
 488
 489 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 490 {
 491     if (!nc || !nc->info->has_vnet_hdr_len) {
 492         return false;
 493     }
 494
 495     return nc->info->has_vnet_hdr_len(nc, len);
 496 }
 497
 498 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 499 {
 500     if (!nc || !nc->info->using_vnet_hdr) {
 501         return;
 502     }
 503
 504     nc->info->using_vnet_hdr(nc, enable);
 505 }
 506
 507 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 508                           int ecn, int ufo)
 509 {
 510     if (!nc || !nc->info->set_offload) {
 511         return;
 512     }
 513
 514     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 515 }
 516
 517 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 518 {
 519     if (!nc || !nc->info->set_vnet_hdr_len) {
 520         return;
 521     }
 522
 523     nc->info->set_vnet_hdr_len(nc, len);
 524 }
 525
 526 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 527 {
 528 #ifdef HOST_WORDS_BIGENDIAN
 529     if (!nc || !nc->info->set_vnet_le) {
 530         return -ENOSYS;
 531     }
 532
 533     return nc->info->set_vnet_le(nc, is_le);
 534 #else
 535     return 0;
 536 #endif
 537 }
 538
 539 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 540 {
 541 #ifdef HOST_WORDS_BIGENDIAN
 542     return 0;
 543 #else
 544     if (!nc || !nc->info->set_vnet_be) {
 545         return -ENOSYS;
 546     }
 547
 548     return nc->info->set_vnet_be(nc, is_be);
 549 #endif
 550 }
 551
 552 int qemu_can_send_packet(NetClientState *sender)
 553 {
 554     int vm_running = runstate_is_running();
 555
 556     if (!vm_running) {
 557         return 0;
 558     }
 559
 560     if (!sender->peer) {
 561         return 1;
 562     }
 563
 564     if (sender->peer->receive_disabled) {
 565         return 0;
 566     } else if (sender->peer->info->can_receive &&
 567                !sender->peer->info->can_receive(sender->peer)) {
 568         return 0;
 569     }
 570     return 1;
 571 }
 572
 573 static ssize_t filter_receive_iov(NetClientState *nc,
 574                                   NetFilterDirection direction,
 575                                   NetClientState *sender,
 576                                   unsigned flags,
 577                                   const struct iovec *iov,
 578                                   int iovcnt,
 579                                   NetPacketSent *sent_cb)
 580 {
 581     ssize_t ret = 0;
 582     NetFilterState *nf = NULL;
 583
 584     if (direction == NET_FILTER_DIRECTION_TX) {
 585         QTAILQ_FOREACH(nf, &nc->filters, next) {
 586             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 587                                          iovcnt, sent_cb);
 588             if (ret) {
 589                 return ret;
 590             }
 591         }
 592     } else {
 593         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
 594             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 595                                          iovcnt, sent_cb);
 596             if (ret) {
 597                 return ret;
 598             }
 599         }
 600     }
 601
 602     return ret;
 603 }
 604
 605 static ssize_t filter_receive(NetClientState *nc,
 606                               NetFilterDirection direction,
 607                               NetClientState *sender,
 608                               unsigned flags,
 609                               const uint8_t *data,
 610                               size_t size,
 611                               NetPacketSent *sent_cb)
 612 {
 613     struct iovec iov = {
 614         .iov_base = (void *)data,
 615         .iov_len = size
 616     };
 617
 618     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 619 }
 620
 621 void qemu_purge_queued_packets(NetClientState *nc)
 622 {
 623     if (!nc->peer) {
 624         return;
 625     }
 626
 627     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 628 }
 629
 630 static
 631 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 632 {
 633     nc->receive_disabled = 0;
 634
 635     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 636         if (net_hub_flush(nc->peer)) {
 637             qemu_notify_event();
 638         }
 639     }
 640     if (qemu_net_queue_flush(nc->incoming_queue)) {
 641         /* We emptied the queue successfully, signal to the IO thread to repoll
 642          * the file descriptor (for tap, for example).
 643          */
 644         qemu_notify_event();
 645     } else if (purge) {
 646         /* Unable to empty the queue, purge remaining packets */
 647         qemu_net_queue_purge(nc->incoming_queue, nc);
 648     }
 649 }
 650
 651 void qemu_flush_queued_packets(NetClientState *nc)
 652 {
 653     qemu_flush_or_purge_queued_packets(nc, false);
 654 }
 655
 656 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 657                                                  unsigned flags,
 658                                                  const uint8_t *buf, int size,
 659                                                  NetPacketSent *sent_cb)
 660 {
 661     NetQueue *queue;
 662     int ret;
 663
 664 #ifdef DEBUG_NET
 665     printf("qemu_send_packet_async:\n");
 666     hex_dump(stdout, buf, size);
 667 #endif
 668
 669     if (sender->link_down || !sender->peer) {
 670         return size;
 671     }
 672
 673     /* Let filters handle the packet first */
 674     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 675                          sender, flags, buf, size, sent_cb);
 676     if (ret) {
 677         return ret;
 678     }
 679
 680     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 681                          sender, flags, buf, size, sent_cb);
 682     if (ret) {
 683         return ret;
 684     }
 685
 686     queue = sender->peer->incoming_queue;
 687
 688     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 689 }
 690
 691 ssize_t qemu_send_packet_async(NetClientState *sender,
 692                                const uint8_t *buf, int size,
 693                                NetPacketSent *sent_cb)
 694 {
 695     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 696                                              buf, size, sent_cb);
 697 }
 698
 699 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 700 {
 701     qemu_send_packet_async(nc, buf, size, NULL);
 702 }
 703
 704 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 705 {
 706     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 707                                              buf, size, NULL);
 708 }
 709
 710 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 711                                int iovcnt, unsigned flags)
 712 {
 713     uint8_t buf[NET_BUFSIZE];
 714     uint8_t *buffer;
 715     size_t offset;
 716
 717     if (iovcnt == 1) {
 718         buffer = iov[0].iov_base;
 719         offset = iov[0].iov_len;
 720     } else {
 721         buffer = buf;
 722         offset = iov_to_buf(iov, iovcnt, 0, buf, sizeof(buf));
 723     }
 724
 725     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 726         return nc->info->receive_raw(nc, buffer, offset);
 727     } else {
 728         return nc->info->receive(nc, buffer, offset);
 729     }
 730 }
 731
 732 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 733                                 unsigned flags,
 734                                 const struct iovec *iov,
 735                                 int iovcnt,
 736                                 void *opaque)
 737 {
 738     NetClientState *nc = opaque;
 739     int ret;
 740
 741     if (nc->link_down) {
 742         return iov_size(iov, iovcnt);
 743     }
 744
 745     if (nc->receive_disabled) {
 746         return 0;
 747     }
 748
 749     if (nc->info->receive_iov) {
 750         ret = nc->info->receive_iov(nc, iov, iovcnt);
 751     } else {
 752         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 753     }
 754
 755     if (ret == 0) {
 756         nc->receive_disabled = 1;
 757     }
 758
 759     return ret;
 760 }
 761
 762 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 763                                 const struct iovec *iov, int iovcnt,
 764                                 NetPacketSent *sent_cb)
 765 {
 766     NetQueue *queue;
 767     int ret;
 768
 769     if (sender->link_down || !sender->peer) {
 770         return iov_size(iov, iovcnt);
 771     }
 772
 773     /* Let filters handle the packet first */
 774     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 775                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 776     if (ret) {
 777         return ret;
 778     }
 779
 780     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 781                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 782     if (ret) {
 783         return ret;
 784     }
 785
 786     queue = sender->peer->incoming_queue;
 787
 788     return qemu_net_queue_send_iov(queue, sender,
 789                                    QEMU_NET_PACKET_FLAG_NONE,
 790                                    iov, iovcnt, sent_cb);
 791 }
 792
 793 ssize_t
 794 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 795 {
 796     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 797 }
 798
 799 NetClientState *qemu_find_netdev(const char *id)
 800 {
 801     NetClientState *nc;
 802
 803     QTAILQ_FOREACH(nc, &net_clients, next) {
 804         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 805             continue;
 806         if (!strcmp(nc->name, id)) {
 807             return nc;
 808         }
 809     }
 810
 811     return NULL;
 812 }
 813
 814 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 815                                  NetClientOptionsKind type, int max)
 816 {
 817     NetClientState *nc;
 818     int ret = 0;
 819
 820     QTAILQ_FOREACH(nc, &net_clients, next) {
 821         if (nc->info->type == type) {
 822             continue;
 823         }
 824         if (!id || !strcmp(nc->name, id)) {
 825             if (ret < max) {
 826                 ncs[ret] = nc;
 827             }
 828             ret++;
 829         }
 830     }
 831
 832     return ret;
 833 }
 834
 835 static int nic_get_free_idx(void)
 836 {
 837     int index;
 838
 839     for (index = 0; index < MAX_NICS; index++)
 840         if (!nd_table[index].used)
 841             return index;
 842     return -1;
 843 }
 844
 845 int qemu_show_nic_models(const char *arg, const char *const *models)
 846 {
 847     int i;
 848
 849     if (!arg || !is_help_option(arg)) {
 850         return 0;
 851     }
 852
 853     fprintf(stderr, "qemu: Supported NIC models: ");
 854     for (i = 0 ; models[i]; i++)
 855         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 856     return 1;
 857 }
 858
 859 void qemu_check_nic_model(NICInfo *nd, const char *model)
 860 {
 861     const char *models[2];
 862
 863     models[0] = model;
 864     models[1] = NULL;
 865
 866     if (qemu_show_nic_models(nd->model, models))
 867         exit(0);
 868     if (qemu_find_nic_model(nd, models, model) < 0)
 869         exit(1);
 870 }
 871
 872 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 873                         const char *default_model)
 874 {
 875     int i;
 876
 877     if (!nd->model)
 878         nd->model = g_strdup(default_model);
 879
 880     for (i = 0 ; models[i]; i++) {
 881         if (strcmp(nd->model, models[i]) == 0)
 882             return i;
 883     }
 884
 885     error_report("Unsupported NIC model: %s", nd->model);
 886     return -1;
 887 }
 888
 889 static int net_init_nic(const NetClientOptions *opts, const char *name,
 890                         NetClientState *peer, Error **errp)
 891 {
 892     int idx;
 893     NICInfo *nd;
 894     const NetLegacyNicOptions *nic;
 895
 896     assert(opts->type == NET_CLIENT_OPTIONS_KIND_NIC);
 897     nic = opts->u.nic;
 898
 899     idx = nic_get_free_idx();
 900     if (idx == -1 || nb_nics >= MAX_NICS) {
 901         error_setg(errp, "too many NICs");
 902         return -1;
 903     }
 904
 905     nd = &nd_table[idx];
 906
 907     memset(nd, 0, sizeof(*nd));
 908
 909     if (nic->has_netdev) {
 910         nd->netdev = qemu_find_netdev(nic->netdev);
 911         if (!nd->netdev) {
 912             error_setg(errp, "netdev '%s' not found", nic->netdev);
 913             return -1;
 914         }
 915     } else {
 916         assert(peer);
 917         nd->netdev = peer;
 918     }
 919     nd->name = g_strdup(name);
 920     if (nic->has_model) {
 921         nd->model = g_strdup(nic->model);
 922     }
 923     if (nic->has_addr) {
 924         nd->devaddr = g_strdup(nic->addr);
 925     }
 926
 927     if (nic->has_macaddr &&
 928         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 929         error_setg(errp, "invalid syntax for ethernet address");
 930         return -1;
 931     }
 932     if (nic->has_macaddr &&
 933         is_multicast_ether_addr(nd->macaddr.a)) {
 934         error_setg(errp,
 935                    "NIC cannot have multicast MAC address (odd 1st byte)");
 936         return -1;
 937     }
 938     qemu_macaddr_default_if_unset(&nd->macaddr);
 939
 940     if (nic->has_vectors) {
 941         if (nic->vectors > 0x7ffffff) {
 942             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 943             return -1;
 944         }
 945         nd->nvectors = nic->vectors;
 946     } else {
 947         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 948     }
 949
 950     nd->used = 1;
 951     nb_nics++;
 952
 953     return idx;
 954 }
 955
 956
 957 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND__MAX])(
 958     const NetClientOptions *opts,
 959     const char *name,
 960     NetClientState *peer, Error **errp) = {
 961         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 962 #ifdef CONFIG_SLIRP
 963         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 964 #endif
 965         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 966         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 967 #ifdef CONFIG_VDE
 968         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 969 #endif
 970 #ifdef CONFIG_NETMAP
 971         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 972 #endif
 973         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 974 #ifdef CONFIG_NET_BRIDGE
 975         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 976 #endif
 977         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 978 #ifdef CONFIG_VHOST_NET_USED
 979         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 980 #endif
 981 #ifdef CONFIG_L2TPV3
 982         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 983 #endif
 984 };
 985
 986
 987 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 988 {
 989     const NetClientOptions *opts;
 990     const char *name;
 991     NetClientState *peer = NULL;
 992
 993     if (is_netdev) {
 994         const Netdev *netdev = object;
 995         opts = netdev->opts;
 996         name = netdev->id;
 997
 998         if (opts->type == NET_CLIENT_OPTIONS_KIND_DUMP ||
 999             opts->type == NET_CLIENT_OPTIONS_KIND_NIC ||
1000             !net_client_init_fun[opts->type]) {
1001             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1002                        "a netdev backend type");
1003             return -1;
1004         }
1005     } else {
1006         const NetLegacy *net = object;
1007         opts = net->opts;
1008         /* missing optional values have been initialized to "all bits zero" */
1009         name = net->has_id ? net->id : net->name;
1010
1011         if (opts->type == NET_CLIENT_OPTIONS_KIND_NONE) {
1012             return 0; /* nothing to do */
1013         }
1014         if (opts->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
1015             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1016                        "a net type");
1017             return -1;
1018         }
1019
1020         if (!net_client_init_fun[opts->type]) {
1021             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1022                        "a net backend type (maybe it is not compiled "
1023                        "into this binary)");
1024             return -1;
1025         }
1026
1027         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1028         if (opts->type != NET_CLIENT_OPTIONS_KIND_NIC ||
1029             !opts->u.nic->has_netdev) {
1030             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1031         }
1032     }
1033
1034     if (net_client_init_fun[opts->type](opts, name, peer, errp) < 0) {
1035         /* FIXME drop when all init functions store an Error */
1036         if (errp && !*errp) {
1037             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1038                        NetClientOptionsKind_lookup[opts->type]);
1039         }
1040         return -1;
1041     }
1042     return 0;
1043 }
1044
1045
1046 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
1047 {
1048     if (is_netdev) {
1049         visit_type_Netdev(v, NULL, (Netdev **)object, errp);
1050     } else {
1051         visit_type_NetLegacy(v, NULL, (NetLegacy **)object, errp);
1052     }
1053 }
1054
1055
1056 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
1057 {
1058     void *object = NULL;
1059     Error *err = NULL;
1060     int ret = -1;
1061
1062     {
1063         OptsVisitor *ov = opts_visitor_new(opts);
1064
1065         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
1066         opts_visitor_cleanup(ov);
1067     }
1068
1069     if (!err) {
1070         ret = net_client_init1(object, is_netdev, &err);
1071     }
1072
1073     if (object) {
1074         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
1075
1076         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
1077         qapi_dealloc_visitor_cleanup(dv);
1078     }
1079
1080     error_propagate(errp, err);
1081     return ret;
1082 }
1083
1084
1085 static int net_host_check_device(const char *device)
1086 {
1087     int i;
1088     for (i = 0; host_net_devices[i]; i++) {
1089         if (!strncmp(host_net_devices[i], device,
1090                      strlen(host_net_devices[i]))) {
1091             return 1;
1092         }
1093     }
1094
1095     return 0;
1096 }
1097
1098 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1099 {
1100     const char *device = qdict_get_str(qdict, "device");
1101     const char *opts_str = qdict_get_try_str(qdict, "opts");
1102     Error *local_err = NULL;
1103     QemuOpts *opts;
1104
1105     if (!net_host_check_device(device)) {
1106         monitor_printf(mon, "invalid host network device %s\n", device);
1107         return;
1108     }
1109
1110     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1111                                    opts_str ? opts_str : "", false);
1112     if (!opts) {
1113         return;
1114     }
1115
1116     qemu_opt_set(opts, "type", device, &error_abort);
1117
1118     net_client_init(opts, 0, &local_err);
1119     if (local_err) {
1120         error_report_err(local_err);
1121         monitor_printf(mon, "adding host network device %s failed\n", device);
1122     }
1123 }
1124
1125 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1126 {
1127     NetClientState *nc;
1128     int vlan_id = qdict_get_int(qdict, "vlan_id");
1129     const char *device = qdict_get_str(qdict, "device");
1130
1131     nc = net_hub_find_client_by_name(vlan_id, device);
1132     if (!nc) {
1133         error_report("Host network device '%s' on hub '%d' not found",
1134                      device, vlan_id);
1135         return;
1136     }
1137     if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1138         error_report("invalid host network device '%s'", device);
1139         return;
1140     }
1141
1142     qemu_del_net_client(nc->peer);
1143     qemu_del_net_client(nc);
1144 }
1145
1146 void netdev_add(QemuOpts *opts, Error **errp)
1147 {
1148     net_client_init(opts, 1, errp);
1149 }
1150
1151 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1152 {
1153     Error *local_err = NULL;
1154     QemuOptsList *opts_list;
1155     QemuOpts *opts;
1156
1157     opts_list = qemu_find_opts_err("netdev", &local_err);
1158     if (local_err) {
1159         goto out;
1160     }
1161
1162     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1163     if (local_err) {
1164         goto out;
1165     }
1166
1167     netdev_add(opts, &local_err);
1168     if (local_err) {
1169         qemu_opts_del(opts);
1170         goto out;
1171     }
1172
1173 out:
1174     error_propagate(errp, local_err);
1175 }
1176
1177 void qmp_netdev_del(const char *id, Error **errp)
1178 {
1179     NetClientState *nc;
1180     QemuOpts *opts;
1181
1182     nc = qemu_find_netdev(id);
1183     if (!nc) {
1184         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1185                   "Device '%s' not found", id);
1186         return;
1187     }
1188
1189     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1190     if (!opts) {
1191         error_setg(errp, "Device '%s' is not a netdev", id);
1192         return;
1193     }
1194
1195     qemu_del_net_client(nc);
1196     qemu_opts_del(opts);
1197 }
1198
1199 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1200 {
1201     char *str;
1202     ObjectProperty *prop;
1203     ObjectPropertyIterator iter;
1204     StringOutputVisitor *ov;
1205
1206     /* generate info str */
1207     object_property_iter_init(&iter, OBJECT(nf));
1208     while ((prop = object_property_iter_next(&iter))) {
1209         if (!strcmp(prop->name, "type")) {
1210             continue;
1211         }
1212         ov = string_output_visitor_new(false);
1213         object_property_get(OBJECT(nf), string_output_get_visitor(ov),
1214                             prop->name, NULL);
1215         str = string_output_get_string(ov);
1216         string_output_visitor_cleanup(ov);
1217         monitor_printf(mon, ",%s=%s", prop->name, str);
1218         g_free(str);
1219     }
1220     monitor_printf(mon, "\n");
1221 }
1222
1223 void print_net_client(Monitor *mon, NetClientState *nc)
1224 {
1225     NetFilterState *nf;
1226
1227     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1228                    nc->queue_index,
1229                    NetClientOptionsKind_lookup[nc->info->type],
1230                    nc->info_str);
1231     if (!QTAILQ_EMPTY(&nc->filters)) {
1232         monitor_printf(mon, "filters:\n");
1233     }
1234     QTAILQ_FOREACH(nf, &nc->filters, next) {
1235         char *path = object_get_canonical_path_component(OBJECT(nf));
1236
1237         monitor_printf(mon, "  - %s: type=%s", path,
1238                        object_get_typename(OBJECT(nf)));
1239         netfilter_print_info(mon, nf);
1240         g_free(path);
1241     }
1242 }
1243
1244 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1245                                       Error **errp)
1246 {
1247     NetClientState *nc;
1248     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1249
1250     QTAILQ_FOREACH(nc, &net_clients, next) {
1251         RxFilterInfoList *entry;
1252         RxFilterInfo *info;
1253
1254         if (has_name && strcmp(nc->name, name) != 0) {
1255             continue;
1256         }
1257
1258         /* only query rx-filter information of NIC */
1259         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1260             if (has_name) {
1261                 error_setg(errp, "net client(%s) isn't a NIC", name);
1262                 return NULL;
1263             }
1264             continue;
1265         }
1266
1267         /* only query information on queue 0 since the info is per nic,
1268          * not per queue
1269          */
1270         if (nc->queue_index != 0)
1271             continue;
1272
1273         if (nc->info->query_rx_filter) {
1274             info = nc->info->query_rx_filter(nc);
1275             entry = g_malloc0(sizeof(*entry));
1276             entry->value = info;
1277
1278             if (!filter_list) {
1279                 filter_list = entry;
1280             } else {
1281                 last_entry->next = entry;
1282             }
1283             last_entry = entry;
1284         } else if (has_name) {
1285             error_setg(errp, "net client(%s) doesn't support"
1286                        " rx-filter querying", name);
1287             return NULL;
1288         }
1289
1290         if (has_name) {
1291             break;
1292         }
1293     }
1294
1295     if (filter_list == NULL && has_name) {
1296         error_setg(errp, "invalid net client name: %s", name);
1297     }
1298
1299     return filter_list;
1300 }
1301
1302 void hmp_info_network(Monitor *mon, const QDict *qdict)
1303 {
1304     NetClientState *nc, *peer;
1305     NetClientOptionsKind type;
1306
1307     net_hub_info(mon);
1308
1309     QTAILQ_FOREACH(nc, &net_clients, next) {
1310         peer = nc->peer;
1311         type = nc->info->type;
1312
1313         /* Skip if already printed in hub info */
1314         if (net_hub_id_for_client(nc, NULL) == 0) {
1315             continue;
1316         }
1317
1318         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1319             print_net_client(mon, nc);
1320         } /* else it's a netdev connected to a NIC, printed with the NIC */
1321         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1322             monitor_printf(mon, " \\ ");
1323             print_net_client(mon, peer);
1324         }
1325     }
1326 }
1327
1328 void qmp_set_link(const char *name, bool up, Error **errp)
1329 {
1330     NetClientState *ncs[MAX_QUEUE_NUM];
1331     NetClientState *nc;
1332     int queues, i;
1333
1334     queues = qemu_find_net_clients_except(name, ncs,
1335                                           NET_CLIENT_OPTIONS_KIND__MAX,
1336                                           MAX_QUEUE_NUM);
1337
1338     if (queues == 0) {
1339         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1340                   "Device '%s' not found", name);
1341         return;
1342     }
1343     nc = ncs[0];
1344
1345     for (i = 0; i < queues; i++) {
1346         ncs[i]->link_down = !up;
1347     }
1348
1349     if (nc->info->link_status_changed) {
1350         nc->info->link_status_changed(nc);
1351     }
1352
1353     if (nc->peer) {
1354         /* Change peer link only if the peer is NIC and then notify peer.
1355          * If the peer is a HUBPORT or a backend, we do not change the
1356          * link status.
1357          *
1358          * This behavior is compatible with qemu vlans where there could be
1359          * multiple clients that can still communicate with each other in
1360          * disconnected mode. For now maintain this compatibility.
1361          */
1362         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1363             for (i = 0; i < queues; i++) {
1364                 ncs[i]->peer->link_down = !up;
1365             }
1366         }
1367         if (nc->peer->info->link_status_changed) {
1368             nc->peer->info->link_status_changed(nc->peer);
1369         }
1370     }
1371 }
1372
1373 static void net_vm_change_state_handler(void *opaque, int running,
1374                                         RunState state)
1375 {
1376     NetClientState *nc;
1377     NetClientState *tmp;
1378
1379     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1380         if (running) {
1381             /* Flush queued packets and wake up backends. */
1382             if (nc->peer && qemu_can_send_packet(nc)) {
1383                 qemu_flush_queued_packets(nc->peer);
1384             }
1385         } else {
1386             /* Complete all queued packets, to guarantee we don't modify
1387              * state later when VM is not running.
1388              */
1389             qemu_flush_or_purge_queued_packets(nc, true);
1390         }
1391     }
1392 }
1393
1394 void net_cleanup(void)
1395 {
1396     NetClientState *nc;
1397
1398     /* We may del multiple entries during qemu_del_net_client(),
1399      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1400      */
1401     while (!QTAILQ_EMPTY(&net_clients)) {
1402         nc = QTAILQ_FIRST(&net_clients);
1403         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1404             qemu_del_nic(qemu_get_nic(nc));
1405         } else {
1406             qemu_del_net_client(nc);
1407         }
1408     }
1409
1410     qemu_del_vm_change_state_handler(net_change_state_entry);
1411 }
1412
1413 void net_check_clients(void)
1414 {
1415     NetClientState *nc;
1416     int i;
1417
1418     /* Don't warn about the default network setup that you get if
1419      * no command line -net or -netdev options are specified. There
1420      * are two cases that we would otherwise complain about:
1421      * (1) board doesn't support a NIC but the implicit "-net nic"
1422      * requested one
1423      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1424      * sets up a nic that isn't connected to anything.
1425      */
1426     if (default_net) {
1427         return;
1428     }
1429
1430     net_hub_check_clients();
1431
1432     QTAILQ_FOREACH(nc, &net_clients, next) {
1433         if (!nc->peer) {
1434             fprintf(stderr, "Warning: %s %s has no peer\n",
1435                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1436                     "nic" : "netdev", nc->name);
1437         }
1438     }
1439
1440     /* Check that all NICs requested via -net nic actually got created.
1441      * NICs created via -device don't need to be checked here because
1442      * they are always instantiated.
1443      */
1444     for (i = 0; i < MAX_NICS; i++) {
1445         NICInfo *nd = &nd_table[i];
1446         if (nd->used && !nd->instantiated) {
1447             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1448                     "was not created (not supported by this machine?)\n",
1449                     nd->name ? nd->name : "anonymous",
1450                     nd->model ? nd->model : "unspecified");
1451         }
1452     }
1453 }
1454
1455 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1456 {
1457     Error *local_err = NULL;
1458
1459     net_client_init(opts, 0, &local_err);
1460     if (local_err) {
1461         error_report_err(local_err);
1462         return -1;
1463     }
1464
1465     return 0;
1466 }
1467
1468 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1469 {
1470     Error *local_err = NULL;
1471     int ret;
1472
1473     ret = net_client_init(opts, 1, &local_err);
1474     if (local_err) {
1475         error_report_err(local_err);
1476         return -1;
1477     }
1478
1479     return ret;
1480 }
1481
1482 int net_init_clients(void)
1483 {
1484     QemuOptsList *net = qemu_find_opts("net");
1485
1486     if (default_net) {
1487         /* if no clients, we use a default config */
1488         qemu_opts_set(net, NULL, "type", "nic", &error_abort);
1489 #ifdef CONFIG_SLIRP
1490         qemu_opts_set(net, NULL, "type", "user", &error_abort);
1491 #endif
1492     }
1493
1494     net_change_state_entry =
1495         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1496
1497     QTAILQ_INIT(&net_clients);
1498
1499     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1500                           net_init_netdev, NULL, NULL)) {
1501         return -1;
1502     }
1503
1504     if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1505         return -1;
1506     }
1507
1508     return 0;
1509 }
1510
1511 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1512 {
1513 #if defined(CONFIG_SLIRP)
1514     int ret;
1515     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1516         return ret;
1517     }
1518 #endif
1519
1520     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1521         return -1;
1522     }
1523
1524     default_net = 0;
1525     return 0;
1526 }
1527
1528 /* From FreeBSD */
1529 /* XXX: optimize */
1530 unsigned compute_mcast_idx(const uint8_t *ep)
1531 {
1532     uint32_t crc;
1533     int carry, i, j;
1534     uint8_t b;
1535
1536     crc = 0xffffffff;
1537     for (i = 0; i < 6; i++) {
1538         b = *ep++;
1539         for (j = 0; j < 8; j++) {
1540             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1541             crc <<= 1;
1542             b >>= 1;
1543             if (carry) {
1544                 crc = ((crc ^ POLYNOMIAL) | carry);
1545             }
1546         }
1547     }
1548     return crc >> 26;
1549 }
1550
1551 QemuOptsList qemu_netdev_opts = {
1552     .name = "netdev",
1553     .implied_opt_name = "type",
1554     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1555     .desc = {
1556         /*
1557          * no elements => accept any params
1558          * validation will happen later
1559          */
1560         { /* end of list */ }
1561     },
1562 };
1563
1564 QemuOptsList qemu_net_opts = {
1565     .name = "net",
1566     .implied_opt_name = "type",
1567     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1568     .desc = {
1569         /*
1570          * no elements => accept any params
1571          * validation will happen later
1572          */
1573         { /* end of list */ }
1574     },
1575 };