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
  25 #include "qemu/osdep.h"
  26
  27 #include "net/net.h"
  28 #include "clients.h"
  29 #include "hub.h"
  30 #include "net/slirp.h"
  31 #include "net/eth.h"
  32 #include "util.h"
  33
  34 #include "monitor/monitor.h"
  35 #include "qemu/help_option.h"
  36 #include "qapi/qapi-commands-net.h"
  37 #include "qapi/qapi-visit-net.h"
  38 #include "qapi/qmp/qdict.h"
  39 #include "qapi/qmp/qerror.h"
  40 #include "qemu/error-report.h"
  41 #include "qemu/sockets.h"
  42 #include "qemu/cutils.h"
  43 #include "qemu/config-file.h"
  44 #include "hw/qdev.h"
  45 #include "qemu/iov.h"
  46 #include "qemu/main-loop.h"
  47 #include "qemu/option.h"
  48 #include "qapi/error.h"
  49 #include "qapi/opts-visitor.h"
  50 #include "sysemu/sysemu.h"
  51 #include "sysemu/qtest.h"
  52 #include "net/filter.h"
  53 #include "qapi/string-output-visitor.h"
  54
  55 /* Net bridge is currently not supported for W32. */
  56 #if !defined(_WIN32)
  57 # define CONFIG_NET_BRIDGE
  58 #endif
  59
  60 static VMChangeStateEntry *net_change_state_entry;
  61 static QTAILQ_HEAD(, NetClientState) net_clients;
  62
  63 /***********************************************************/
  64 /* network device redirectors */
  65
  66 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  67 {
  68     const char *p, *p1;
  69     int len;
  70     p = *pp;
  71     p1 = strchr(p, sep);
  72     if (!p1)
  73         return -1;
  74     len = p1 - p;
  75     p1++;
  76     if (buf_size > 0) {
  77         if (len > buf_size - 1)
  78             len = buf_size - 1;
  79         memcpy(buf, p, len);
  80         buf[len] = '\0';
  81     }
  82     *pp = p1;
  83     return 0;
  84 }
  85
  86 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  87                     Error **errp)
  88 {
  89     char buf[512];
  90     struct hostent *he;
  91     const char *p, *r;
  92     int port;
  93
  94     p = str;
  95     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
  96         error_setg(errp, "host address '%s' doesn't contain ':' "
  97                    "separating host from port", str);
  98         return -1;
  99     }
 100     saddr->sin_family = AF_INET;
 101     if (buf[0] == '\0') {
 102         saddr->sin_addr.s_addr = 0;
 103     } else {
 104         if (qemu_isdigit(buf[0])) {
 105             if (!inet_aton(buf, &saddr->sin_addr)) {
 106                 error_setg(errp, "host address '%s' is not a valid "
 107                            "IPv4 address", buf);
 108                 return -1;
 109             }
 110         } else {
 111             he = gethostbyname(buf);
 112             if (he == NULL) {
 113                 error_setg(errp, "can't resolve host address '%s'", buf);
 114                 return - 1;
 115             }
 116             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 117         }
 118     }
 119     port = strtol(p, (char **)&r, 0);
 120     if (r == p) {
 121         error_setg(errp, "port number '%s' is invalid", p);
 122         return -1;
 123     }
 124     saddr->sin_port = htons(port);
 125     return 0;
 126 }
 127
 128 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 129 {
 130     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 131                            macaddr[0], macaddr[1], macaddr[2],
 132                            macaddr[3], macaddr[4], macaddr[5]);
 133 }
 134
 135 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 136 {
 137     snprintf(nc->info_str, sizeof(nc->info_str),
 138              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 139              nc->model,
 140              macaddr[0], macaddr[1], macaddr[2],
 141              macaddr[3], macaddr[4], macaddr[5]);
 142 }
 143
 144 static int mac_table[256] = {0};
 145
 146 static void qemu_macaddr_set_used(MACAddr *macaddr)
 147 {
 148     int index;
 149
 150     for (index = 0x56; index < 0xFF; index++) {
 151         if (macaddr->a[5] == index) {
 152             mac_table[index]++;
 153         }
 154     }
 155 }
 156
 157 static void qemu_macaddr_set_free(MACAddr *macaddr)
 158 {
 159     int index;
 160     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 161
 162     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 163         return;
 164     }
 165     for (index = 0x56; index < 0xFF; index++) {
 166         if (macaddr->a[5] == index) {
 167             mac_table[index]--;
 168         }
 169     }
 170 }
 171
 172 static int qemu_macaddr_get_free(void)
 173 {
 174     int index;
 175
 176     for (index = 0x56; index < 0xFF; index++) {
 177         if (mac_table[index] == 0) {
 178             return index;
 179         }
 180     }
 181
 182     return -1;
 183 }
 184
 185 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 186 {
 187     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 188     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 189
 190     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 191         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 192             return;
 193         } else {
 194             qemu_macaddr_set_used(macaddr);
 195             return;
 196         }
 197     }
 198
 199     macaddr->a[0] = 0x52;
 200     macaddr->a[1] = 0x54;
 201     macaddr->a[2] = 0x00;
 202     macaddr->a[3] = 0x12;
 203     macaddr->a[4] = 0x34;
 204     macaddr->a[5] = qemu_macaddr_get_free();
 205     qemu_macaddr_set_used(macaddr);
 206 }
 207
 208 /**
 209  * Generate a name for net client
 210  *
 211  * Only net clients created with the legacy -net option and NICs need this.
 212  */
 213 static char *assign_name(NetClientState *nc1, const char *model)
 214 {
 215     NetClientState *nc;
 216     int id = 0;
 217
 218     QTAILQ_FOREACH(nc, &net_clients, next) {
 219         if (nc == nc1) {
 220             continue;
 221         }
 222         if (strcmp(nc->model, model) == 0) {
 223             id++;
 224         }
 225     }
 226
 227     return g_strdup_printf("%s.%d", model, id);
 228 }
 229
 230 static void qemu_net_client_destructor(NetClientState *nc)
 231 {
 232     g_free(nc);
 233 }
 234 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 235                                        unsigned flags,
 236                                        const struct iovec *iov,
 237                                        int iovcnt,
 238                                        void *opaque);
 239
 240 static void qemu_net_client_setup(NetClientState *nc,
 241                                   NetClientInfo *info,
 242                                   NetClientState *peer,
 243                                   const char *model,
 244                                   const char *name,
 245                                   NetClientDestructor *destructor)
 246 {
 247     nc->info = info;
 248     nc->model = g_strdup(model);
 249     if (name) {
 250         nc->name = g_strdup(name);
 251     } else {
 252         nc->name = assign_name(nc, model);
 253     }
 254
 255     if (peer) {
 256         assert(!peer->peer);
 257         nc->peer = peer;
 258         peer->peer = nc;
 259     }
 260     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 261
 262     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 263     nc->destructor = destructor;
 264     QTAILQ_INIT(&nc->filters);
 265 }
 266
 267 NetClientState *qemu_new_net_client(NetClientInfo *info,
 268                                     NetClientState *peer,
 269                                     const char *model,
 270                                     const char *name)
 271 {
 272     NetClientState *nc;
 273
 274     assert(info->size >= sizeof(NetClientState));
 275
 276     nc = g_malloc0(info->size);
 277     qemu_net_client_setup(nc, info, peer, model, name,
 278                           qemu_net_client_destructor);
 279
 280     return nc;
 281 }
 282
 283 NICState *qemu_new_nic(NetClientInfo *info,
 284                        NICConf *conf,
 285                        const char *model,
 286                        const char *name,
 287                        void *opaque)
 288 {
 289     NetClientState **peers = conf->peers.ncs;
 290     NICState *nic;
 291     int i, queues = MAX(1, conf->peers.queues);
 292
 293     assert(info->type == NET_CLIENT_DRIVER_NIC);
 294     assert(info->size >= sizeof(NICState));
 295
 296     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 297     nic->ncs = (void *)nic + info->size;
 298     nic->conf = conf;
 299     nic->opaque = opaque;
 300
 301     for (i = 0; i < queues; i++) {
 302         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 303                               NULL);
 304         nic->ncs[i].queue_index = i;
 305     }
 306
 307     return nic;
 308 }
 309
 310 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 311 {
 312     return nic->ncs + queue_index;
 313 }
 314
 315 NetClientState *qemu_get_queue(NICState *nic)
 316 {
 317     return qemu_get_subqueue(nic, 0);
 318 }
 319
 320 NICState *qemu_get_nic(NetClientState *nc)
 321 {
 322     NetClientState *nc0 = nc - nc->queue_index;
 323
 324     return (NICState *)((void *)nc0 - nc->info->size);
 325 }
 326
 327 void *qemu_get_nic_opaque(NetClientState *nc)
 328 {
 329     NICState *nic = qemu_get_nic(nc);
 330
 331     return nic->opaque;
 332 }
 333
 334 static void qemu_cleanup_net_client(NetClientState *nc)
 335 {
 336     QTAILQ_REMOVE(&net_clients, nc, next);
 337
 338     if (nc->info->cleanup) {
 339         nc->info->cleanup(nc);
 340     }
 341 }
 342
 343 static void qemu_free_net_client(NetClientState *nc)
 344 {
 345     if (nc->incoming_queue) {
 346         qemu_del_net_queue(nc->incoming_queue);
 347     }
 348     if (nc->peer) {
 349         nc->peer->peer = NULL;
 350     }
 351     g_free(nc->name);
 352     g_free(nc->model);
 353     if (nc->destructor) {
 354         nc->destructor(nc);
 355     }
 356 }
 357
 358 void qemu_del_net_client(NetClientState *nc)
 359 {
 360     NetClientState *ncs[MAX_QUEUE_NUM];
 361     int queues, i;
 362     NetFilterState *nf, *next;
 363
 364     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 365
 366     /* If the NetClientState belongs to a multiqueue backend, we will change all
 367      * other NetClientStates also.
 368      */
 369     queues = qemu_find_net_clients_except(nc->name, ncs,
 370                                           NET_CLIENT_DRIVER_NIC,
 371                                           MAX_QUEUE_NUM);
 372     assert(queues != 0);
 373
 374     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 375         object_unparent(OBJECT(nf));
 376     }
 377
 378     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 379     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 380         NICState *nic = qemu_get_nic(nc->peer);
 381         if (nic->peer_deleted) {
 382             return;
 383         }
 384         nic->peer_deleted = true;
 385
 386         for (i = 0; i < queues; i++) {
 387             ncs[i]->peer->link_down = true;
 388         }
 389
 390         if (nc->peer->info->link_status_changed) {
 391             nc->peer->info->link_status_changed(nc->peer);
 392         }
 393
 394         for (i = 0; i < queues; i++) {
 395             qemu_cleanup_net_client(ncs[i]);
 396         }
 397
 398         return;
 399     }
 400
 401     for (i = 0; i < queues; i++) {
 402         qemu_cleanup_net_client(ncs[i]);
 403         qemu_free_net_client(ncs[i]);
 404     }
 405 }
 406
 407 void qemu_del_nic(NICState *nic)
 408 {
 409     int i, queues = MAX(nic->conf->peers.queues, 1);
 410
 411     qemu_macaddr_set_free(&nic->conf->macaddr);
 412
 413     /* If this is a peer NIC and peer has already been deleted, free it now. */
 414     if (nic->peer_deleted) {
 415         for (i = 0; i < queues; i++) {
 416             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 417         }
 418     }
 419
 420     for (i = queues - 1; i >= 0; i--) {
 421         NetClientState *nc = qemu_get_subqueue(nic, i);
 422
 423         qemu_cleanup_net_client(nc);
 424         qemu_free_net_client(nc);
 425     }
 426
 427     g_free(nic);
 428 }
 429
 430 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 431 {
 432     NetClientState *nc;
 433
 434     QTAILQ_FOREACH(nc, &net_clients, next) {
 435         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 436             if (nc->queue_index == 0) {
 437                 func(qemu_get_nic(nc), opaque);
 438             }
 439         }
 440     }
 441 }
 442
 443 bool qemu_has_ufo(NetClientState *nc)
 444 {
 445     if (!nc || !nc->info->has_ufo) {
 446         return false;
 447     }
 448
 449     return nc->info->has_ufo(nc);
 450 }
 451
 452 bool qemu_has_vnet_hdr(NetClientState *nc)
 453 {
 454     if (!nc || !nc->info->has_vnet_hdr) {
 455         return false;
 456     }
 457
 458     return nc->info->has_vnet_hdr(nc);
 459 }
 460
 461 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 462 {
 463     if (!nc || !nc->info->has_vnet_hdr_len) {
 464         return false;
 465     }
 466
 467     return nc->info->has_vnet_hdr_len(nc, len);
 468 }
 469
 470 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 471 {
 472     if (!nc || !nc->info->using_vnet_hdr) {
 473         return;
 474     }
 475
 476     nc->info->using_vnet_hdr(nc, enable);
 477 }
 478
 479 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 480                           int ecn, int ufo)
 481 {
 482     if (!nc || !nc->info->set_offload) {
 483         return;
 484     }
 485
 486     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 487 }
 488
 489 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 490 {
 491     if (!nc || !nc->info->set_vnet_hdr_len) {
 492         return;
 493     }
 494
 495     nc->vnet_hdr_len = len;
 496     nc->info->set_vnet_hdr_len(nc, len);
 497 }
 498
 499 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 500 {
 501 #ifdef HOST_WORDS_BIGENDIAN
 502     if (!nc || !nc->info->set_vnet_le) {
 503         return -ENOSYS;
 504     }
 505
 506     return nc->info->set_vnet_le(nc, is_le);
 507 #else
 508     return 0;
 509 #endif
 510 }
 511
 512 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 513 {
 514 #ifdef HOST_WORDS_BIGENDIAN
 515     return 0;
 516 #else
 517     if (!nc || !nc->info->set_vnet_be) {
 518         return -ENOSYS;
 519     }
 520
 521     return nc->info->set_vnet_be(nc, is_be);
 522 #endif
 523 }
 524
 525 int qemu_can_send_packet(NetClientState *sender)
 526 {
 527     int vm_running = runstate_is_running();
 528
 529     if (!vm_running) {
 530         return 0;
 531     }
 532
 533     if (!sender->peer) {
 534         return 1;
 535     }
 536
 537     if (sender->peer->receive_disabled) {
 538         return 0;
 539     } else if (sender->peer->info->can_receive &&
 540                !sender->peer->info->can_receive(sender->peer)) {
 541         return 0;
 542     }
 543     return 1;
 544 }
 545
 546 static ssize_t filter_receive_iov(NetClientState *nc,
 547                                   NetFilterDirection direction,
 548                                   NetClientState *sender,
 549                                   unsigned flags,
 550                                   const struct iovec *iov,
 551                                   int iovcnt,
 552                                   NetPacketSent *sent_cb)
 553 {
 554     ssize_t ret = 0;
 555     NetFilterState *nf = NULL;
 556
 557     if (direction == NET_FILTER_DIRECTION_TX) {
 558         QTAILQ_FOREACH(nf, &nc->filters, next) {
 559             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 560                                          iovcnt, sent_cb);
 561             if (ret) {
 562                 return ret;
 563             }
 564         }
 565     } else {
 566         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
 567             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 568                                          iovcnt, sent_cb);
 569             if (ret) {
 570                 return ret;
 571             }
 572         }
 573     }
 574
 575     return ret;
 576 }
 577
 578 static ssize_t filter_receive(NetClientState *nc,
 579                               NetFilterDirection direction,
 580                               NetClientState *sender,
 581                               unsigned flags,
 582                               const uint8_t *data,
 583                               size_t size,
 584                               NetPacketSent *sent_cb)
 585 {
 586     struct iovec iov = {
 587         .iov_base = (void *)data,
 588         .iov_len = size
 589     };
 590
 591     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 592 }
 593
 594 void qemu_purge_queued_packets(NetClientState *nc)
 595 {
 596     if (!nc->peer) {
 597         return;
 598     }
 599
 600     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 601 }
 602
 603 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 604 {
 605     nc->receive_disabled = 0;
 606
 607     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 608         if (net_hub_flush(nc->peer)) {
 609             qemu_notify_event();
 610         }
 611     }
 612     if (qemu_net_queue_flush(nc->incoming_queue)) {
 613         /* We emptied the queue successfully, signal to the IO thread to repoll
 614          * the file descriptor (for tap, for example).
 615          */
 616         qemu_notify_event();
 617     } else if (purge) {
 618         /* Unable to empty the queue, purge remaining packets */
 619         qemu_net_queue_purge(nc->incoming_queue, nc);
 620     }
 621 }
 622
 623 void qemu_flush_queued_packets(NetClientState *nc)
 624 {
 625     qemu_flush_or_purge_queued_packets(nc, false);
 626 }
 627
 628 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 629                                                  unsigned flags,
 630                                                  const uint8_t *buf, int size,
 631                                                  NetPacketSent *sent_cb)
 632 {
 633     NetQueue *queue;
 634     int ret;
 635
 636 #ifdef DEBUG_NET
 637     printf("qemu_send_packet_async:\n");
 638     qemu_hexdump((const char *)buf, stdout, "net", size);
 639 #endif
 640
 641     if (sender->link_down || !sender->peer) {
 642         return size;
 643     }
 644
 645     /* Let filters handle the packet first */
 646     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 647                          sender, flags, buf, size, sent_cb);
 648     if (ret) {
 649         return ret;
 650     }
 651
 652     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 653                          sender, flags, buf, size, sent_cb);
 654     if (ret) {
 655         return ret;
 656     }
 657
 658     queue = sender->peer->incoming_queue;
 659
 660     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 661 }
 662
 663 ssize_t qemu_send_packet_async(NetClientState *sender,
 664                                const uint8_t *buf, int size,
 665                                NetPacketSent *sent_cb)
 666 {
 667     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 668                                              buf, size, sent_cb);
 669 }
 670
 671 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 672 {
 673     qemu_send_packet_async(nc, buf, size, NULL);
 674 }
 675
 676 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 677 {
 678     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 679                                              buf, size, NULL);
 680 }
 681
 682 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 683                                int iovcnt, unsigned flags)
 684 {
 685     uint8_t *buf = NULL;
 686     uint8_t *buffer;
 687     size_t offset;
 688     ssize_t ret;
 689
 690     if (iovcnt == 1) {
 691         buffer = iov[0].iov_base;
 692         offset = iov[0].iov_len;
 693     } else {
 694         offset = iov_size(iov, iovcnt);
 695         if (offset > NET_BUFSIZE) {
 696             return -1;
 697         }
 698         buf = g_malloc(offset);
 699         buffer = buf;
 700         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 701     }
 702
 703     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 704         ret = nc->info->receive_raw(nc, buffer, offset);
 705     } else {
 706         ret = nc->info->receive(nc, buffer, offset);
 707     }
 708
 709     g_free(buf);
 710     return ret;
 711 }
 712
 713 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 714                                        unsigned flags,
 715                                        const struct iovec *iov,
 716                                        int iovcnt,
 717                                        void *opaque)
 718 {
 719     NetClientState *nc = opaque;
 720     int ret;
 721
 722
 723     if (nc->link_down) {
 724         return iov_size(iov, iovcnt);
 725     }
 726
 727     if (nc->receive_disabled) {
 728         return 0;
 729     }
 730
 731     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 732         ret = nc->info->receive_iov(nc, iov, iovcnt);
 733     } else {
 734         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 735     }
 736
 737     if (ret == 0) {
 738         nc->receive_disabled = 1;
 739     }
 740
 741     return ret;
 742 }
 743
 744 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 745                                 const struct iovec *iov, int iovcnt,
 746                                 NetPacketSent *sent_cb)
 747 {
 748     NetQueue *queue;
 749     size_t size = iov_size(iov, iovcnt);
 750     int ret;
 751
 752     if (size > NET_BUFSIZE) {
 753         return size;
 754     }
 755
 756     if (sender->link_down || !sender->peer) {
 757         return size;
 758     }
 759
 760     /* Let filters handle the packet first */
 761     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 762                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 763     if (ret) {
 764         return ret;
 765     }
 766
 767     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 768                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 769     if (ret) {
 770         return ret;
 771     }
 772
 773     queue = sender->peer->incoming_queue;
 774
 775     return qemu_net_queue_send_iov(queue, sender,
 776                                    QEMU_NET_PACKET_FLAG_NONE,
 777                                    iov, iovcnt, sent_cb);
 778 }
 779
 780 ssize_t
 781 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 782 {
 783     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 784 }
 785
 786 NetClientState *qemu_find_netdev(const char *id)
 787 {
 788     NetClientState *nc;
 789
 790     QTAILQ_FOREACH(nc, &net_clients, next) {
 791         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 792             continue;
 793         if (!strcmp(nc->name, id)) {
 794             return nc;
 795         }
 796     }
 797
 798     return NULL;
 799 }
 800
 801 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 802                                  NetClientDriver type, int max)
 803 {
 804     NetClientState *nc;
 805     int ret = 0;
 806
 807     QTAILQ_FOREACH(nc, &net_clients, next) {
 808         if (nc->info->type == type) {
 809             continue;
 810         }
 811         if (!id || !strcmp(nc->name, id)) {
 812             if (ret < max) {
 813                 ncs[ret] = nc;
 814             }
 815             ret++;
 816         }
 817     }
 818
 819     return ret;
 820 }
 821
 822 static int nic_get_free_idx(void)
 823 {
 824     int index;
 825
 826     for (index = 0; index < MAX_NICS; index++)
 827         if (!nd_table[index].used)
 828             return index;
 829     return -1;
 830 }
 831
 832 int qemu_show_nic_models(const char *arg, const char *const *models)
 833 {
 834     int i;
 835
 836     if (!arg || !is_help_option(arg)) {
 837         return 0;
 838     }
 839
 840     fprintf(stderr, "qemu: Supported NIC models: ");
 841     for (i = 0 ; models[i]; i++)
 842         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 843     return 1;
 844 }
 845
 846 void qemu_check_nic_model(NICInfo *nd, const char *model)
 847 {
 848     const char *models[2];
 849
 850     models[0] = model;
 851     models[1] = NULL;
 852
 853     if (qemu_show_nic_models(nd->model, models))
 854         exit(0);
 855     if (qemu_find_nic_model(nd, models, model) < 0)
 856         exit(1);
 857 }
 858
 859 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 860                         const char *default_model)
 861 {
 862     int i;
 863
 864     if (!nd->model)
 865         nd->model = g_strdup(default_model);
 866
 867     for (i = 0 ; models[i]; i++) {
 868         if (strcmp(nd->model, models[i]) == 0)
 869             return i;
 870     }
 871
 872     error_report("Unsupported NIC model: %s", nd->model);
 873     return -1;
 874 }
 875
 876 static int net_init_nic(const Netdev *netdev, const char *name,
 877                         NetClientState *peer, Error **errp)
 878 {
 879     int idx;
 880     NICInfo *nd;
 881     const NetLegacyNicOptions *nic;
 882
 883     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 884     nic = &netdev->u.nic;
 885
 886     idx = nic_get_free_idx();
 887     if (idx == -1 || nb_nics >= MAX_NICS) {
 888         error_setg(errp, "too many NICs");
 889         return -1;
 890     }
 891
 892     nd = &nd_table[idx];
 893
 894     memset(nd, 0, sizeof(*nd));
 895
 896     if (nic->has_netdev) {
 897         nd->netdev = qemu_find_netdev(nic->netdev);
 898         if (!nd->netdev) {
 899             error_setg(errp, "netdev '%s' not found", nic->netdev);
 900             return -1;
 901         }
 902     } else {
 903         assert(peer);
 904         nd->netdev = peer;
 905     }
 906     nd->name = g_strdup(name);
 907     if (nic->has_model) {
 908         nd->model = g_strdup(nic->model);
 909     }
 910     if (nic->has_addr) {
 911         nd->devaddr = g_strdup(nic->addr);
 912     }
 913
 914     if (nic->has_macaddr &&
 915         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 916         error_setg(errp, "invalid syntax for ethernet address");
 917         return -1;
 918     }
 919     if (nic->has_macaddr &&
 920         is_multicast_ether_addr(nd->macaddr.a)) {
 921         error_setg(errp,
 922                    "NIC cannot have multicast MAC address (odd 1st byte)");
 923         return -1;
 924     }
 925     qemu_macaddr_default_if_unset(&nd->macaddr);
 926
 927     if (nic->has_vectors) {
 928         if (nic->vectors > 0x7ffffff) {
 929             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 930             return -1;
 931         }
 932         nd->nvectors = nic->vectors;
 933     } else {
 934         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 935     }
 936
 937     nd->used = 1;
 938     nb_nics++;
 939
 940     return idx;
 941 }
 942
 943
 944 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 945     const Netdev *netdev,
 946     const char *name,
 947     NetClientState *peer, Error **errp) = {
 948         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 949 #ifdef CONFIG_SLIRP
 950         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 951 #endif
 952         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 953         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 954 #ifdef CONFIG_VDE
 955         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 956 #endif
 957 #ifdef CONFIG_NETMAP
 958         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 959 #endif
 960 #ifdef CONFIG_NET_BRIDGE
 961         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 962 #endif
 963         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 964 #ifdef CONFIG_VHOST_NET_USED
 965         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 966 #endif
 967 #ifdef CONFIG_L2TPV3
 968         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 969 #endif
 970 };
 971
 972
 973 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 974 {
 975     Netdev legacy = {0};
 976     const Netdev *netdev;
 977     const char *name;
 978     NetClientState *peer = NULL;
 979
 980     if (is_netdev) {
 981         netdev = object;
 982         name = netdev->id;
 983
 984         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 985             !net_client_init_fun[netdev->type]) {
 986             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 987                        "a netdev backend type");
 988             return -1;
 989         }
 990     } else {
 991         const NetLegacy *net = object;
 992         const NetLegacyOptions *opts = net->opts;
 993         legacy.id = net->id;
 994         netdev = &legacy;
 995         /* missing optional values have been initialized to "all bits zero" */
 996         name = net->has_id ? net->id : net->name;
 997
 998         if (net->has_name) {
 999             warn_report("The 'name' parameter is deprecated, use 'id' instead");
1000         }
1001
1002         /* Map the old options to the new flat type */
1003         switch (opts->type) {
1004         case NET_LEGACY_OPTIONS_TYPE_NONE:
1005             return 0; /* nothing to do */
1006         case NET_LEGACY_OPTIONS_TYPE_NIC:
1007             legacy.type = NET_CLIENT_DRIVER_NIC;
1008             legacy.u.nic = opts->u.nic;
1009             break;
1010         case NET_LEGACY_OPTIONS_TYPE_USER:
1011             legacy.type = NET_CLIENT_DRIVER_USER;
1012             legacy.u.user = opts->u.user;
1013             break;
1014         case NET_LEGACY_OPTIONS_TYPE_TAP:
1015             legacy.type = NET_CLIENT_DRIVER_TAP;
1016             legacy.u.tap = opts->u.tap;
1017             break;
1018         case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1019             legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1020             legacy.u.l2tpv3 = opts->u.l2tpv3;
1021             break;
1022         case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1023             legacy.type = NET_CLIENT_DRIVER_SOCKET;
1024             legacy.u.socket = opts->u.socket;
1025             break;
1026         case NET_LEGACY_OPTIONS_TYPE_VDE:
1027             legacy.type = NET_CLIENT_DRIVER_VDE;
1028             legacy.u.vde = opts->u.vde;
1029             break;
1030         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1031             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1032             legacy.u.bridge = opts->u.bridge;
1033             break;
1034         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1035             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1036             legacy.u.netmap = opts->u.netmap;
1037             break;
1038         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1039             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1040             legacy.u.vhost_user = opts->u.vhost_user;
1041             break;
1042         default:
1043             abort();
1044         }
1045
1046         if (!net_client_init_fun[netdev->type]) {
1047             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1048                        "a net backend type (maybe it is not compiled "
1049                        "into this binary)");
1050             return -1;
1051         }
1052
1053         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1054         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1055             !opts->u.nic.has_netdev) {
1056             peer = net_hub_add_port(0, NULL, NULL);
1057         }
1058     }
1059
1060     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1061         /* FIXME drop when all init functions store an Error */
1062         if (errp && !*errp) {
1063             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1064                        NetClientDriver_str(netdev->type));
1065         }
1066         return -1;
1067     }
1068     return 0;
1069 }
1070
1071 static void show_netdevs(void)
1072 {
1073     int idx;
1074     const char *available_netdevs[] = {
1075         "socket",
1076         "hubport",
1077         "tap",
1078 #ifdef CONFIG_SLIRP
1079         "user",
1080 #endif
1081 #ifdef CONFIG_L2TPV3
1082         "l2tpv3",
1083 #endif
1084 #ifdef CONFIG_VDE
1085         "vde",
1086 #endif
1087 #ifdef CONFIG_NET_BRIDGE
1088         "bridge",
1089 #endif
1090 #ifdef CONFIG_NETMAP
1091         "netmap",
1092 #endif
1093 #ifdef CONFIG_POSIX
1094         "vhost-user",
1095 #endif
1096     };
1097
1098     printf("Available netdev backend types:\n");
1099     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1100         puts(available_netdevs[idx]);
1101     }
1102 }
1103
1104 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1105 {
1106     void *object = NULL;
1107     Error *err = NULL;
1108     int ret = -1;
1109     Visitor *v = opts_visitor_new(opts);
1110
1111     const char *type = qemu_opt_get(opts, "type");
1112
1113     if (is_netdev && type && is_help_option(type)) {
1114         show_netdevs();
1115         exit(0);
1116     } else {
1117         /* Parse convenience option format ip6-net=fec0::0[/64] */
1118         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1119
1120         if (ip6_net) {
1121             char buf[strlen(ip6_net) + 1];
1122
1123             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1124                 /* Default 64bit prefix length.  */
1125                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1126                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1127             } else {
1128                 /* User-specified prefix length.  */
1129                 unsigned long len;
1130                 int err;
1131
1132                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1133                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1134
1135                 if (err) {
1136                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1137                               "ipv6-prefix", "a number");
1138                 } else {
1139                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1140                                         &error_abort);
1141                 }
1142             }
1143             qemu_opt_unset(opts, "ipv6-net");
1144         }
1145     }
1146
1147     if (is_netdev) {
1148         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1149     } else {
1150         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1151     }
1152
1153     if (!err) {
1154         ret = net_client_init1(object, is_netdev, &err);
1155     }
1156
1157     if (is_netdev) {
1158         qapi_free_Netdev(object);
1159     } else {
1160         qapi_free_NetLegacy(object);
1161     }
1162
1163     error_propagate(errp, err);
1164     visit_free(v);
1165     return ret;
1166 }
1167
1168 void netdev_add(QemuOpts *opts, Error **errp)
1169 {
1170     net_client_init(opts, true, errp);
1171 }
1172
1173 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1174 {
1175     Error *local_err = NULL;
1176     QemuOptsList *opts_list;
1177     QemuOpts *opts;
1178
1179     opts_list = qemu_find_opts_err("netdev", &local_err);
1180     if (local_err) {
1181         goto out;
1182     }
1183
1184     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1185     if (local_err) {
1186         goto out;
1187     }
1188
1189     netdev_add(opts, &local_err);
1190     if (local_err) {
1191         qemu_opts_del(opts);
1192         goto out;
1193     }
1194
1195 out:
1196     error_propagate(errp, local_err);
1197 }
1198
1199 void qmp_netdev_del(const char *id, Error **errp)
1200 {
1201     NetClientState *nc;
1202     QemuOpts *opts;
1203
1204     nc = qemu_find_netdev(id);
1205     if (!nc) {
1206         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1207                   "Device '%s' not found", id);
1208         return;
1209     }
1210
1211     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1212     if (!opts) {
1213         error_setg(errp, "Device '%s' is not a netdev", id);
1214         return;
1215     }
1216
1217     qemu_del_net_client(nc);
1218     qemu_opts_del(opts);
1219 }
1220
1221 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1222 {
1223     char *str;
1224     ObjectProperty *prop;
1225     ObjectPropertyIterator iter;
1226     Visitor *v;
1227
1228     /* generate info str */
1229     object_property_iter_init(&iter, OBJECT(nf));
1230     while ((prop = object_property_iter_next(&iter))) {
1231         if (!strcmp(prop->name, "type")) {
1232             continue;
1233         }
1234         v = string_output_visitor_new(false, &str);
1235         object_property_get(OBJECT(nf), v, prop->name, NULL);
1236         visit_complete(v, &str);
1237         visit_free(v);
1238         monitor_printf(mon, ",%s=%s", prop->name, str);
1239         g_free(str);
1240     }
1241     monitor_printf(mon, "\n");
1242 }
1243
1244 void print_net_client(Monitor *mon, NetClientState *nc)
1245 {
1246     NetFilterState *nf;
1247
1248     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1249                    nc->queue_index,
1250                    NetClientDriver_str(nc->info->type),
1251                    nc->info_str);
1252     if (!QTAILQ_EMPTY(&nc->filters)) {
1253         monitor_printf(mon, "filters:\n");
1254     }
1255     QTAILQ_FOREACH(nf, &nc->filters, next) {
1256         char *path = object_get_canonical_path_component(OBJECT(nf));
1257
1258         monitor_printf(mon, "  - %s: type=%s", path,
1259                        object_get_typename(OBJECT(nf)));
1260         netfilter_print_info(mon, nf);
1261         g_free(path);
1262     }
1263 }
1264
1265 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1266                                       Error **errp)
1267 {
1268     NetClientState *nc;
1269     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1270
1271     QTAILQ_FOREACH(nc, &net_clients, next) {
1272         RxFilterInfoList *entry;
1273         RxFilterInfo *info;
1274
1275         if (has_name && strcmp(nc->name, name) != 0) {
1276             continue;
1277         }
1278
1279         /* only query rx-filter information of NIC */
1280         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1281             if (has_name) {
1282                 error_setg(errp, "net client(%s) isn't a NIC", name);
1283                 return NULL;
1284             }
1285             continue;
1286         }
1287
1288         /* only query information on queue 0 since the info is per nic,
1289          * not per queue
1290          */
1291         if (nc->queue_index != 0)
1292             continue;
1293
1294         if (nc->info->query_rx_filter) {
1295             info = nc->info->query_rx_filter(nc);
1296             entry = g_malloc0(sizeof(*entry));
1297             entry->value = info;
1298
1299             if (!filter_list) {
1300                 filter_list = entry;
1301             } else {
1302                 last_entry->next = entry;
1303             }
1304             last_entry = entry;
1305         } else if (has_name) {
1306             error_setg(errp, "net client(%s) doesn't support"
1307                        " rx-filter querying", name);
1308             return NULL;
1309         }
1310
1311         if (has_name) {
1312             break;
1313         }
1314     }
1315
1316     if (filter_list == NULL && has_name) {
1317         error_setg(errp, "invalid net client name: %s", name);
1318     }
1319
1320     return filter_list;
1321 }
1322
1323 void hmp_info_network(Monitor *mon, const QDict *qdict)
1324 {
1325     NetClientState *nc, *peer;
1326     NetClientDriver type;
1327
1328     net_hub_info(mon);
1329
1330     QTAILQ_FOREACH(nc, &net_clients, next) {
1331         peer = nc->peer;
1332         type = nc->info->type;
1333
1334         /* Skip if already printed in hub info */
1335         if (net_hub_id_for_client(nc, NULL) == 0) {
1336             continue;
1337         }
1338
1339         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1340             print_net_client(mon, nc);
1341         } /* else it's a netdev connected to a NIC, printed with the NIC */
1342         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1343             monitor_printf(mon, " \\ ");
1344             print_net_client(mon, peer);
1345         }
1346     }
1347 }
1348
1349 void colo_notify_filters_event(int event, Error **errp)
1350 {
1351     NetClientState *nc;
1352     NetFilterState *nf;
1353     NetFilterClass *nfc = NULL;
1354     Error *local_err = NULL;
1355
1356     QTAILQ_FOREACH(nc, &net_clients, next) {
1357         QTAILQ_FOREACH(nf, &nc->filters, next) {
1358             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1359             nfc->handle_event(nf, event, &local_err);
1360             if (local_err) {
1361                 error_propagate(errp, local_err);
1362                 return;
1363             }
1364         }
1365     }
1366 }
1367
1368 void qmp_set_link(const char *name, bool up, Error **errp)
1369 {
1370     NetClientState *ncs[MAX_QUEUE_NUM];
1371     NetClientState *nc;
1372     int queues, i;
1373
1374     queues = qemu_find_net_clients_except(name, ncs,
1375                                           NET_CLIENT_DRIVER__MAX,
1376                                           MAX_QUEUE_NUM);
1377
1378     if (queues == 0) {
1379         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1380                   "Device '%s' not found", name);
1381         return;
1382     }
1383     nc = ncs[0];
1384
1385     for (i = 0; i < queues; i++) {
1386         ncs[i]->link_down = !up;
1387     }
1388
1389     if (nc->info->link_status_changed) {
1390         nc->info->link_status_changed(nc);
1391     }
1392
1393     if (nc->peer) {
1394         /* Change peer link only if the peer is NIC and then notify peer.
1395          * If the peer is a HUBPORT or a backend, we do not change the
1396          * link status.
1397          *
1398          * This behavior is compatible with qemu hubs where there could be
1399          * multiple clients that can still communicate with each other in
1400          * disconnected mode. For now maintain this compatibility.
1401          */
1402         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1403             for (i = 0; i < queues; i++) {
1404                 ncs[i]->peer->link_down = !up;
1405             }
1406         }
1407         if (nc->peer->info->link_status_changed) {
1408             nc->peer->info->link_status_changed(nc->peer);
1409         }
1410     }
1411 }
1412
1413 static void net_vm_change_state_handler(void *opaque, int running,
1414                                         RunState state)
1415 {
1416     NetClientState *nc;
1417     NetClientState *tmp;
1418
1419     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1420         if (running) {
1421             /* Flush queued packets and wake up backends. */
1422             if (nc->peer && qemu_can_send_packet(nc)) {
1423                 qemu_flush_queued_packets(nc->peer);
1424             }
1425         } else {
1426             /* Complete all queued packets, to guarantee we don't modify
1427              * state later when VM is not running.
1428              */
1429             qemu_flush_or_purge_queued_packets(nc, true);
1430         }
1431     }
1432 }
1433
1434 void net_cleanup(void)
1435 {
1436     NetClientState *nc;
1437
1438     /* We may del multiple entries during qemu_del_net_client(),
1439      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1440      */
1441     while (!QTAILQ_EMPTY(&net_clients)) {
1442         nc = QTAILQ_FIRST(&net_clients);
1443         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1444             qemu_del_nic(qemu_get_nic(nc));
1445         } else {
1446             qemu_del_net_client(nc);
1447         }
1448     }
1449
1450     qemu_del_vm_change_state_handler(net_change_state_entry);
1451 }
1452
1453 void net_check_clients(void)
1454 {
1455     NetClientState *nc;
1456     int i;
1457
1458     net_hub_check_clients();
1459
1460     QTAILQ_FOREACH(nc, &net_clients, next) {
1461         if (!nc->peer) {
1462             warn_report("%s %s has no peer",
1463                         nc->info->type == NET_CLIENT_DRIVER_NIC
1464                         ? "nic" : "netdev",
1465                         nc->name);
1466         }
1467     }
1468
1469     /* Check that all NICs requested via -net nic actually got created.
1470      * NICs created via -device don't need to be checked here because
1471      * they are always instantiated.
1472      */
1473     for (i = 0; i < MAX_NICS; i++) {
1474         NICInfo *nd = &nd_table[i];
1475         if (nd->used && !nd->instantiated) {
1476             warn_report("requested NIC (%s, model %s) "
1477                         "was not created (not supported by this machine?)",
1478                         nd->name ? nd->name : "anonymous",
1479                         nd->model ? nd->model : "unspecified");
1480         }
1481     }
1482 }
1483
1484 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1485 {
1486     return net_client_init(opts, false, errp);
1487 }
1488
1489 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1490 {
1491     return net_client_init(opts, true, errp);
1492 }
1493
1494 /* For the convenience "--nic" parameter */
1495 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1496 {
1497     char *mac, *nd_id;
1498     int idx, ret;
1499     NICInfo *ni;
1500     const char *type;
1501
1502     type = qemu_opt_get(opts, "type");
1503     if (type && g_str_equal(type, "none")) {
1504         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1505     }
1506
1507     idx = nic_get_free_idx();
1508     if (idx == -1 || nb_nics >= MAX_NICS) {
1509         error_setg(errp, "no more on-board/default NIC slots available");
1510         return -1;
1511     }
1512
1513     if (!type) {
1514         qemu_opt_set(opts, "type", "user", &error_abort);
1515     }
1516
1517     ni = &nd_table[idx];
1518     memset(ni, 0, sizeof(*ni));
1519     ni->model = qemu_opt_get_del(opts, "model");
1520
1521     /* Create an ID if the user did not specify one */
1522     nd_id = g_strdup(qemu_opts_id(opts));
1523     if (!nd_id) {
1524         nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1525         qemu_opts_set_id(opts, nd_id);
1526     }
1527
1528     /* Handle MAC address */
1529     mac = qemu_opt_get_del(opts, "mac");
1530     if (mac) {
1531         ret = net_parse_macaddr(ni->macaddr.a, mac);
1532         g_free(mac);
1533         if (ret) {
1534             error_setg(errp, "invalid syntax for ethernet address");
1535             goto out;
1536         }
1537         if (is_multicast_ether_addr(ni->macaddr.a)) {
1538             error_setg(errp, "NIC cannot have multicast MAC address");
1539             ret = -1;
1540             goto out;
1541         }
1542     }
1543     qemu_macaddr_default_if_unset(&ni->macaddr);
1544
1545     ret = net_client_init(opts, true, errp);
1546     if (ret == 0) {
1547         ni->netdev = qemu_find_netdev(nd_id);
1548         ni->used = true;
1549         nb_nics++;
1550     }
1551
1552 out:
1553     g_free(nd_id);
1554     return ret;
1555 }
1556
1557 int net_init_clients(Error **errp)
1558 {
1559     net_change_state_entry =
1560         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1561
1562     QTAILQ_INIT(&net_clients);
1563
1564     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1565                           net_init_netdev, NULL, errp)) {
1566         return -1;
1567     }
1568
1569     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1570         return -1;
1571     }
1572
1573     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1574         return -1;
1575     }
1576
1577     return 0;
1578 }
1579
1580 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1581 {
1582     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1583         return -1;
1584     }
1585
1586     return 0;
1587 }
1588
1589 /* From FreeBSD */
1590 /* XXX: optimize */
1591 uint32_t net_crc32(const uint8_t *p, int len)
1592 {
1593     uint32_t crc;
1594     int carry, i, j;
1595     uint8_t b;
1596
1597     crc = 0xffffffff;
1598     for (i = 0; i < len; i++) {
1599         b = *p++;
1600         for (j = 0; j < 8; j++) {
1601             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1602             crc <<= 1;
1603             b >>= 1;
1604             if (carry) {
1605                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1606             }
1607         }
1608     }
1609
1610     return crc;
1611 }
1612
1613 uint32_t net_crc32_le(const uint8_t *p, int len)
1614 {
1615     uint32_t crc;
1616     int carry, i, j;
1617     uint8_t b;
1618
1619     crc = 0xffffffff;
1620     for (i = 0; i < len; i++) {
1621         b = *p++;
1622         for (j = 0; j < 8; j++) {
1623             carry = (crc & 0x1) ^ (b & 0x01);
1624             crc >>= 1;
1625             b >>= 1;
1626             if (carry) {
1627                 crc ^= POLYNOMIAL_LE;
1628             }
1629         }
1630     }
1631
1632     return crc;
1633 }
1634
1635 QemuOptsList qemu_netdev_opts = {
1636     .name = "netdev",
1637     .implied_opt_name = "type",
1638     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1639     .desc = {
1640         /*
1641          * no elements => accept any params
1642          * validation will happen later
1643          */
1644         { /* end of list */ }
1645     },
1646 };
1647
1648 QemuOptsList qemu_nic_opts = {
1649     .name = "nic",
1650     .implied_opt_name = "type",
1651     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1652     .desc = {
1653         /*
1654          * no elements => accept any params
1655          * validation will happen later
1656          */
1657         { /* end of list */ }
1658     },
1659 };
1660
1661 QemuOptsList qemu_net_opts = {
1662     .name = "net",
1663     .implied_opt_name = "type",
1664     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1665     .desc = {
1666         /*
1667          * no elements => accept any params
1668          * validation will happen later
1669          */
1670         { /* end of list */ }
1671     },
1672 };
1673
1674 void net_socket_rs_init(SocketReadState *rs,
1675                         SocketReadStateFinalize *finalize,
1676                         bool vnet_hdr)
1677 {
1678     rs->state = 0;
1679     rs->vnet_hdr = vnet_hdr;
1680     rs->index = 0;
1681     rs->packet_len = 0;
1682     rs->vnet_hdr_len = 0;
1683     memset(rs->buf, 0, sizeof(rs->buf));
1684     rs->finalize = finalize;
1685 }
1686
1687 /*
1688  * Returns
1689  * 0: success
1690  * -1: error occurs
1691  */
1692 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1693 {
1694     unsigned int l;
1695
1696     while (size > 0) {
1697         /* Reassemble a packet from the network.
1698          * 0 = getting length.
1699          * 1 = getting vnet header length.
1700          * 2 = getting data.
1701          */
1702         switch (rs->state) {
1703         case 0:
1704             l = 4 - rs->index;
1705             if (l > size) {
1706                 l = size;
1707             }
1708             memcpy(rs->buf + rs->index, buf, l);
1709             buf += l;
1710             size -= l;
1711             rs->index += l;
1712             if (rs->index == 4) {
1713                 /* got length */
1714                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1715                 rs->index = 0;
1716                 if (rs->vnet_hdr) {
1717                     rs->state = 1;
1718                 } else {
1719                     rs->state = 2;
1720                     rs->vnet_hdr_len = 0;
1721                 }
1722             }
1723             break;
1724         case 1:
1725             l = 4 - rs->index;
1726             if (l > size) {
1727                 l = size;
1728             }
1729             memcpy(rs->buf + rs->index, buf, l);
1730             buf += l;
1731             size -= l;
1732             rs->index += l;
1733             if (rs->index == 4) {
1734                 /* got vnet header length */
1735                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1736                 rs->index = 0;
1737                 rs->state = 2;
1738             }
1739             break;
1740         case 2:
1741             l = rs->packet_len - rs->index;
1742             if (l > size) {
1743                 l = size;
1744             }
1745             if (rs->index + l <= sizeof(rs->buf)) {
1746                 memcpy(rs->buf + rs->index, buf, l);
1747             } else {
1748                 fprintf(stderr, "serious error: oversized packet received,"
1749                     "connection terminated.\n");
1750                 rs->index = rs->state = 0;
1751                 return -1;
1752             }
1753
1754             rs->index += l;
1755             buf += l;
1756             size -= l;
1757             if (rs->index >= rs->packet_len) {
1758                 rs->index = 0;
1759                 rs->state = 0;
1760                 assert(rs->finalize);
1761                 rs->finalize(rs);
1762             }
1763             break;
1764         }
1765     }
1766
1767     assert(size == 0);
1768     return 0;
1769 }