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, 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 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 672 {
 673     return 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     printf("Supported NIC models:\n");
 841     for (i = 0 ; models[i]; i++) {
 842         printf("%s\n", models[i]);
 843     }
 844     return 1;
 845 }
 846
 847 void qemu_check_nic_model(NICInfo *nd, const char *model)
 848 {
 849     const char *models[2];
 850
 851     models[0] = model;
 852     models[1] = NULL;
 853
 854     if (qemu_show_nic_models(nd->model, models))
 855         exit(0);
 856     if (qemu_find_nic_model(nd, models, model) < 0)
 857         exit(1);
 858 }
 859
 860 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 861                         const char *default_model)
 862 {
 863     int i;
 864
 865     if (!nd->model)
 866         nd->model = g_strdup(default_model);
 867
 868     for (i = 0 ; models[i]; i++) {
 869         if (strcmp(nd->model, models[i]) == 0)
 870             return i;
 871     }
 872
 873     error_report("Unsupported NIC model: %s", nd->model);
 874     return -1;
 875 }
 876
 877 static int net_init_nic(const Netdev *netdev, const char *name,
 878                         NetClientState *peer, Error **errp)
 879 {
 880     int idx;
 881     NICInfo *nd;
 882     const NetLegacyNicOptions *nic;
 883
 884     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 885     nic = &netdev->u.nic;
 886
 887     idx = nic_get_free_idx();
 888     if (idx == -1 || nb_nics >= MAX_NICS) {
 889         error_setg(errp, "too many NICs");
 890         return -1;
 891     }
 892
 893     nd = &nd_table[idx];
 894
 895     memset(nd, 0, sizeof(*nd));
 896
 897     if (nic->has_netdev) {
 898         nd->netdev = qemu_find_netdev(nic->netdev);
 899         if (!nd->netdev) {
 900             error_setg(errp, "netdev '%s' not found", nic->netdev);
 901             return -1;
 902         }
 903     } else {
 904         assert(peer);
 905         nd->netdev = peer;
 906     }
 907     nd->name = g_strdup(name);
 908     if (nic->has_model) {
 909         nd->model = g_strdup(nic->model);
 910     }
 911     if (nic->has_addr) {
 912         nd->devaddr = g_strdup(nic->addr);
 913     }
 914
 915     if (nic->has_macaddr &&
 916         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 917         error_setg(errp, "invalid syntax for ethernet address");
 918         return -1;
 919     }
 920     if (nic->has_macaddr &&
 921         is_multicast_ether_addr(nd->macaddr.a)) {
 922         error_setg(errp,
 923                    "NIC cannot have multicast MAC address (odd 1st byte)");
 924         return -1;
 925     }
 926     qemu_macaddr_default_if_unset(&nd->macaddr);
 927
 928     if (nic->has_vectors) {
 929         if (nic->vectors > 0x7ffffff) {
 930             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 931             return -1;
 932         }
 933         nd->nvectors = nic->vectors;
 934     } else {
 935         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 936     }
 937
 938     nd->used = 1;
 939     nb_nics++;
 940
 941     return idx;
 942 }
 943
 944
 945 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 946     const Netdev *netdev,
 947     const char *name,
 948     NetClientState *peer, Error **errp) = {
 949         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 950 #ifdef CONFIG_SLIRP
 951         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 952 #endif
 953         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 954         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 955 #ifdef CONFIG_VDE
 956         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 957 #endif
 958 #ifdef CONFIG_NETMAP
 959         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 960 #endif
 961 #ifdef CONFIG_NET_BRIDGE
 962         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 963 #endif
 964         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 965 #ifdef CONFIG_VHOST_NET_USER
 966         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 967 #endif
 968 #ifdef CONFIG_L2TPV3
 969         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 970 #endif
 971 };
 972
 973
 974 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 975 {
 976     Netdev legacy = {0};
 977     const Netdev *netdev;
 978     const char *name;
 979     NetClientState *peer = NULL;
 980
 981     if (is_netdev) {
 982         netdev = object;
 983         name = netdev->id;
 984
 985         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 986             !net_client_init_fun[netdev->type]) {
 987             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 988                        "a netdev backend type");
 989             return -1;
 990         }
 991     } else {
 992         const NetLegacy *net = object;
 993         const NetLegacyOptions *opts = net->opts;
 994         legacy.id = net->id;
 995         netdev = &legacy;
 996         /* missing optional values have been initialized to "all bits zero" */
 997         name = net->has_id ? net->id : net->name;
 998
 999         if (net->has_name) {
1000             warn_report("The 'name' parameter is deprecated, use 'id' instead");
1001         }
1002
1003         /* Map the old options to the new flat type */
1004         switch (opts->type) {
1005         case NET_LEGACY_OPTIONS_TYPE_NONE:
1006             return 0; /* nothing to do */
1007         case NET_LEGACY_OPTIONS_TYPE_NIC:
1008             legacy.type = NET_CLIENT_DRIVER_NIC;
1009             legacy.u.nic = opts->u.nic;
1010             break;
1011         case NET_LEGACY_OPTIONS_TYPE_USER:
1012             legacy.type = NET_CLIENT_DRIVER_USER;
1013             legacy.u.user = opts->u.user;
1014             break;
1015         case NET_LEGACY_OPTIONS_TYPE_TAP:
1016             legacy.type = NET_CLIENT_DRIVER_TAP;
1017             legacy.u.tap = opts->u.tap;
1018             break;
1019         case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1020             legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1021             legacy.u.l2tpv3 = opts->u.l2tpv3;
1022             break;
1023         case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1024             legacy.type = NET_CLIENT_DRIVER_SOCKET;
1025             legacy.u.socket = opts->u.socket;
1026             break;
1027         case NET_LEGACY_OPTIONS_TYPE_VDE:
1028             legacy.type = NET_CLIENT_DRIVER_VDE;
1029             legacy.u.vde = opts->u.vde;
1030             break;
1031         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1032             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1033             legacy.u.bridge = opts->u.bridge;
1034             break;
1035         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1036             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1037             legacy.u.netmap = opts->u.netmap;
1038             break;
1039         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1040             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1041             legacy.u.vhost_user = opts->u.vhost_user;
1042             break;
1043         default:
1044             abort();
1045         }
1046
1047         if (!net_client_init_fun[netdev->type]) {
1048             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1049                        "a net backend type (maybe it is not compiled "
1050                        "into this binary)");
1051             return -1;
1052         }
1053
1054         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1055         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1056             !opts->u.nic.has_netdev) {
1057             peer = net_hub_add_port(0, NULL, NULL);
1058         }
1059     }
1060
1061     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1062         /* FIXME drop when all init functions store an Error */
1063         if (errp && !*errp) {
1064             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1065                        NetClientDriver_str(netdev->type));
1066         }
1067         return -1;
1068     }
1069     return 0;
1070 }
1071
1072 static void show_netdevs(void)
1073 {
1074     int idx;
1075     const char *available_netdevs[] = {
1076         "socket",
1077         "hubport",
1078         "tap",
1079 #ifdef CONFIG_SLIRP
1080         "user",
1081 #endif
1082 #ifdef CONFIG_L2TPV3
1083         "l2tpv3",
1084 #endif
1085 #ifdef CONFIG_VDE
1086         "vde",
1087 #endif
1088 #ifdef CONFIG_NET_BRIDGE
1089         "bridge",
1090 #endif
1091 #ifdef CONFIG_NETMAP
1092         "netmap",
1093 #endif
1094 #ifdef CONFIG_POSIX
1095         "vhost-user",
1096 #endif
1097     };
1098
1099     printf("Available netdev backend types:\n");
1100     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1101         puts(available_netdevs[idx]);
1102     }
1103 }
1104
1105 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1106 {
1107     void *object = NULL;
1108     Error *err = NULL;
1109     int ret = -1;
1110     Visitor *v = opts_visitor_new(opts);
1111
1112     const char *type = qemu_opt_get(opts, "type");
1113
1114     if (is_netdev && type && is_help_option(type)) {
1115         show_netdevs();
1116         exit(0);
1117     } else {
1118         /* Parse convenience option format ip6-net=fec0::0[/64] */
1119         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1120
1121         if (ip6_net) {
1122             char buf[strlen(ip6_net) + 1];
1123
1124             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1125                 /* Default 64bit prefix length.  */
1126                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1127                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1128             } else {
1129                 /* User-specified prefix length.  */
1130                 unsigned long len;
1131                 int err;
1132
1133                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1134                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1135
1136                 if (err) {
1137                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1138                               "ipv6-prefix", "a number");
1139                 } else {
1140                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1141                                         &error_abort);
1142                 }
1143             }
1144             qemu_opt_unset(opts, "ipv6-net");
1145         }
1146     }
1147
1148     if (is_netdev) {
1149         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1150     } else {
1151         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1152     }
1153
1154     if (!err) {
1155         ret = net_client_init1(object, is_netdev, &err);
1156     }
1157
1158     if (is_netdev) {
1159         qapi_free_Netdev(object);
1160     } else {
1161         qapi_free_NetLegacy(object);
1162     }
1163
1164     error_propagate(errp, err);
1165     visit_free(v);
1166     return ret;
1167 }
1168
1169 void netdev_add(QemuOpts *opts, Error **errp)
1170 {
1171     net_client_init(opts, true, errp);
1172 }
1173
1174 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1175 {
1176     Error *local_err = NULL;
1177     QemuOptsList *opts_list;
1178     QemuOpts *opts;
1179
1180     opts_list = qemu_find_opts_err("netdev", &local_err);
1181     if (local_err) {
1182         goto out;
1183     }
1184
1185     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1186     if (local_err) {
1187         goto out;
1188     }
1189
1190     netdev_add(opts, &local_err);
1191     if (local_err) {
1192         qemu_opts_del(opts);
1193         goto out;
1194     }
1195
1196 out:
1197     error_propagate(errp, local_err);
1198 }
1199
1200 void qmp_netdev_del(const char *id, Error **errp)
1201 {
1202     NetClientState *nc;
1203     QemuOpts *opts;
1204
1205     nc = qemu_find_netdev(id);
1206     if (!nc) {
1207         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1208                   "Device '%s' not found", id);
1209         return;
1210     }
1211
1212     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1213     if (!opts) {
1214         error_setg(errp, "Device '%s' is not a netdev", id);
1215         return;
1216     }
1217
1218     qemu_del_net_client(nc);
1219     qemu_opts_del(opts);
1220 }
1221
1222 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1223 {
1224     char *str;
1225     ObjectProperty *prop;
1226     ObjectPropertyIterator iter;
1227     Visitor *v;
1228
1229     /* generate info str */
1230     object_property_iter_init(&iter, OBJECT(nf));
1231     while ((prop = object_property_iter_next(&iter))) {
1232         if (!strcmp(prop->name, "type")) {
1233             continue;
1234         }
1235         v = string_output_visitor_new(false, &str);
1236         object_property_get(OBJECT(nf), v, prop->name, NULL);
1237         visit_complete(v, &str);
1238         visit_free(v);
1239         monitor_printf(mon, ",%s=%s", prop->name, str);
1240         g_free(str);
1241     }
1242     monitor_printf(mon, "\n");
1243 }
1244
1245 void print_net_client(Monitor *mon, NetClientState *nc)
1246 {
1247     NetFilterState *nf;
1248
1249     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1250                    nc->queue_index,
1251                    NetClientDriver_str(nc->info->type),
1252                    nc->info_str);
1253     if (!QTAILQ_EMPTY(&nc->filters)) {
1254         monitor_printf(mon, "filters:\n");
1255     }
1256     QTAILQ_FOREACH(nf, &nc->filters, next) {
1257         char *path = object_get_canonical_path_component(OBJECT(nf));
1258
1259         monitor_printf(mon, "  - %s: type=%s", path,
1260                        object_get_typename(OBJECT(nf)));
1261         netfilter_print_info(mon, nf);
1262         g_free(path);
1263     }
1264 }
1265
1266 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1267                                       Error **errp)
1268 {
1269     NetClientState *nc;
1270     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1271
1272     QTAILQ_FOREACH(nc, &net_clients, next) {
1273         RxFilterInfoList *entry;
1274         RxFilterInfo *info;
1275
1276         if (has_name && strcmp(nc->name, name) != 0) {
1277             continue;
1278         }
1279
1280         /* only query rx-filter information of NIC */
1281         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1282             if (has_name) {
1283                 error_setg(errp, "net client(%s) isn't a NIC", name);
1284                 return NULL;
1285             }
1286             continue;
1287         }
1288
1289         /* only query information on queue 0 since the info is per nic,
1290          * not per queue
1291          */
1292         if (nc->queue_index != 0)
1293             continue;
1294
1295         if (nc->info->query_rx_filter) {
1296             info = nc->info->query_rx_filter(nc);
1297             entry = g_malloc0(sizeof(*entry));
1298             entry->value = info;
1299
1300             if (!filter_list) {
1301                 filter_list = entry;
1302             } else {
1303                 last_entry->next = entry;
1304             }
1305             last_entry = entry;
1306         } else if (has_name) {
1307             error_setg(errp, "net client(%s) doesn't support"
1308                        " rx-filter querying", name);
1309             return NULL;
1310         }
1311
1312         if (has_name) {
1313             break;
1314         }
1315     }
1316
1317     if (filter_list == NULL && has_name) {
1318         error_setg(errp, "invalid net client name: %s", name);
1319     }
1320
1321     return filter_list;
1322 }
1323
1324 void hmp_info_network(Monitor *mon, const QDict *qdict)
1325 {
1326     NetClientState *nc, *peer;
1327     NetClientDriver type;
1328
1329     net_hub_info(mon);
1330
1331     QTAILQ_FOREACH(nc, &net_clients, next) {
1332         peer = nc->peer;
1333         type = nc->info->type;
1334
1335         /* Skip if already printed in hub info */
1336         if (net_hub_id_for_client(nc, NULL) == 0) {
1337             continue;
1338         }
1339
1340         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1341             print_net_client(mon, nc);
1342         } /* else it's a netdev connected to a NIC, printed with the NIC */
1343         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1344             monitor_printf(mon, " \\ ");
1345             print_net_client(mon, peer);
1346         }
1347     }
1348 }
1349
1350 void colo_notify_filters_event(int event, Error **errp)
1351 {
1352     NetClientState *nc;
1353     NetFilterState *nf;
1354     NetFilterClass *nfc = NULL;
1355     Error *local_err = NULL;
1356
1357     QTAILQ_FOREACH(nc, &net_clients, next) {
1358         QTAILQ_FOREACH(nf, &nc->filters, next) {
1359             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1360             nfc->handle_event(nf, event, &local_err);
1361             if (local_err) {
1362                 error_propagate(errp, local_err);
1363                 return;
1364             }
1365         }
1366     }
1367 }
1368
1369 void qmp_set_link(const char *name, bool up, Error **errp)
1370 {
1371     NetClientState *ncs[MAX_QUEUE_NUM];
1372     NetClientState *nc;
1373     int queues, i;
1374
1375     queues = qemu_find_net_clients_except(name, ncs,
1376                                           NET_CLIENT_DRIVER__MAX,
1377                                           MAX_QUEUE_NUM);
1378
1379     if (queues == 0) {
1380         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1381                   "Device '%s' not found", name);
1382         return;
1383     }
1384     nc = ncs[0];
1385
1386     for (i = 0; i < queues; i++) {
1387         ncs[i]->link_down = !up;
1388     }
1389
1390     if (nc->info->link_status_changed) {
1391         nc->info->link_status_changed(nc);
1392     }
1393
1394     if (nc->peer) {
1395         /* Change peer link only if the peer is NIC and then notify peer.
1396          * If the peer is a HUBPORT or a backend, we do not change the
1397          * link status.
1398          *
1399          * This behavior is compatible with qemu hubs where there could be
1400          * multiple clients that can still communicate with each other in
1401          * disconnected mode. For now maintain this compatibility.
1402          */
1403         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1404             for (i = 0; i < queues; i++) {
1405                 ncs[i]->peer->link_down = !up;
1406             }
1407         }
1408         if (nc->peer->info->link_status_changed) {
1409             nc->peer->info->link_status_changed(nc->peer);
1410         }
1411     }
1412 }
1413
1414 static void net_vm_change_state_handler(void *opaque, int running,
1415                                         RunState state)
1416 {
1417     NetClientState *nc;
1418     NetClientState *tmp;
1419
1420     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1421         if (running) {
1422             /* Flush queued packets and wake up backends. */
1423             if (nc->peer && qemu_can_send_packet(nc)) {
1424                 qemu_flush_queued_packets(nc->peer);
1425             }
1426         } else {
1427             /* Complete all queued packets, to guarantee we don't modify
1428              * state later when VM is not running.
1429              */
1430             qemu_flush_or_purge_queued_packets(nc, true);
1431         }
1432     }
1433 }
1434
1435 void net_cleanup(void)
1436 {
1437     NetClientState *nc;
1438
1439     /* We may del multiple entries during qemu_del_net_client(),
1440      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1441      */
1442     while (!QTAILQ_EMPTY(&net_clients)) {
1443         nc = QTAILQ_FIRST(&net_clients);
1444         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1445             qemu_del_nic(qemu_get_nic(nc));
1446         } else {
1447             qemu_del_net_client(nc);
1448         }
1449     }
1450
1451     qemu_del_vm_change_state_handler(net_change_state_entry);
1452 }
1453
1454 void net_check_clients(void)
1455 {
1456     NetClientState *nc;
1457     int i;
1458
1459     net_hub_check_clients();
1460
1461     QTAILQ_FOREACH(nc, &net_clients, next) {
1462         if (!nc->peer) {
1463             warn_report("%s %s has no peer",
1464                         nc->info->type == NET_CLIENT_DRIVER_NIC
1465                         ? "nic" : "netdev",
1466                         nc->name);
1467         }
1468     }
1469
1470     /* Check that all NICs requested via -net nic actually got created.
1471      * NICs created via -device don't need to be checked here because
1472      * they are always instantiated.
1473      */
1474     for (i = 0; i < MAX_NICS; i++) {
1475         NICInfo *nd = &nd_table[i];
1476         if (nd->used && !nd->instantiated) {
1477             warn_report("requested NIC (%s, model %s) "
1478                         "was not created (not supported by this machine?)",
1479                         nd->name ? nd->name : "anonymous",
1480                         nd->model ? nd->model : "unspecified");
1481         }
1482     }
1483 }
1484
1485 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1486 {
1487     return net_client_init(opts, false, errp);
1488 }
1489
1490 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1491 {
1492     return net_client_init(opts, true, errp);
1493 }
1494
1495 /* For the convenience "--nic" parameter */
1496 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1497 {
1498     char *mac, *nd_id;
1499     int idx, ret;
1500     NICInfo *ni;
1501     const char *type;
1502
1503     type = qemu_opt_get(opts, "type");
1504     if (type && g_str_equal(type, "none")) {
1505         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1506     }
1507
1508     idx = nic_get_free_idx();
1509     if (idx == -1 || nb_nics >= MAX_NICS) {
1510         error_setg(errp, "no more on-board/default NIC slots available");
1511         return -1;
1512     }
1513
1514     if (!type) {
1515         qemu_opt_set(opts, "type", "user", &error_abort);
1516     }
1517
1518     ni = &nd_table[idx];
1519     memset(ni, 0, sizeof(*ni));
1520     ni->model = qemu_opt_get_del(opts, "model");
1521
1522     /* Create an ID if the user did not specify one */
1523     nd_id = g_strdup(qemu_opts_id(opts));
1524     if (!nd_id) {
1525         nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1526         qemu_opts_set_id(opts, nd_id);
1527     }
1528
1529     /* Handle MAC address */
1530     mac = qemu_opt_get_del(opts, "mac");
1531     if (mac) {
1532         ret = net_parse_macaddr(ni->macaddr.a, mac);
1533         g_free(mac);
1534         if (ret) {
1535             error_setg(errp, "invalid syntax for ethernet address");
1536             goto out;
1537         }
1538         if (is_multicast_ether_addr(ni->macaddr.a)) {
1539             error_setg(errp, "NIC cannot have multicast MAC address");
1540             ret = -1;
1541             goto out;
1542         }
1543     }
1544     qemu_macaddr_default_if_unset(&ni->macaddr);
1545
1546     ret = net_client_init(opts, true, errp);
1547     if (ret == 0) {
1548         ni->netdev = qemu_find_netdev(nd_id);
1549         ni->used = true;
1550         nb_nics++;
1551     }
1552
1553 out:
1554     g_free(nd_id);
1555     return ret;
1556 }
1557
1558 int net_init_clients(Error **errp)
1559 {
1560     net_change_state_entry =
1561         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1562
1563     QTAILQ_INIT(&net_clients);
1564
1565     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1566                           net_init_netdev, NULL, errp)) {
1567         return -1;
1568     }
1569
1570     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1571         return -1;
1572     }
1573
1574     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1575         return -1;
1576     }
1577
1578     return 0;
1579 }
1580
1581 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1582 {
1583     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1584         return -1;
1585     }
1586
1587     return 0;
1588 }
1589
1590 /* From FreeBSD */
1591 /* XXX: optimize */
1592 uint32_t net_crc32(const uint8_t *p, int len)
1593 {
1594     uint32_t crc;
1595     int carry, i, j;
1596     uint8_t b;
1597
1598     crc = 0xffffffff;
1599     for (i = 0; i < len; i++) {
1600         b = *p++;
1601         for (j = 0; j < 8; j++) {
1602             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1603             crc <<= 1;
1604             b >>= 1;
1605             if (carry) {
1606                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1607             }
1608         }
1609     }
1610
1611     return crc;
1612 }
1613
1614 uint32_t net_crc32_le(const uint8_t *p, int len)
1615 {
1616     uint32_t crc;
1617     int carry, i, j;
1618     uint8_t b;
1619
1620     crc = 0xffffffff;
1621     for (i = 0; i < len; i++) {
1622         b = *p++;
1623         for (j = 0; j < 8; j++) {
1624             carry = (crc & 0x1) ^ (b & 0x01);
1625             crc >>= 1;
1626             b >>= 1;
1627             if (carry) {
1628                 crc ^= POLYNOMIAL_LE;
1629             }
1630         }
1631     }
1632
1633     return crc;
1634 }
1635
1636 QemuOptsList qemu_netdev_opts = {
1637     .name = "netdev",
1638     .implied_opt_name = "type",
1639     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1640     .desc = {
1641         /*
1642          * no elements => accept any params
1643          * validation will happen later
1644          */
1645         { /* end of list */ }
1646     },
1647 };
1648
1649 QemuOptsList qemu_nic_opts = {
1650     .name = "nic",
1651     .implied_opt_name = "type",
1652     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1653     .desc = {
1654         /*
1655          * no elements => accept any params
1656          * validation will happen later
1657          */
1658         { /* end of list */ }
1659     },
1660 };
1661
1662 QemuOptsList qemu_net_opts = {
1663     .name = "net",
1664     .implied_opt_name = "type",
1665     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1666     .desc = {
1667         /*
1668          * no elements => accept any params
1669          * validation will happen later
1670          */
1671         { /* end of list */ }
1672     },
1673 };
1674
1675 void net_socket_rs_init(SocketReadState *rs,
1676                         SocketReadStateFinalize *finalize,
1677                         bool vnet_hdr)
1678 {
1679     rs->state = 0;
1680     rs->vnet_hdr = vnet_hdr;
1681     rs->index = 0;
1682     rs->packet_len = 0;
1683     rs->vnet_hdr_len = 0;
1684     memset(rs->buf, 0, sizeof(rs->buf));
1685     rs->finalize = finalize;
1686 }
1687
1688 /*
1689  * Returns
1690  * 0: success
1691  * -1: error occurs
1692  */
1693 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1694 {
1695     unsigned int l;
1696
1697     while (size > 0) {
1698         /* Reassemble a packet from the network.
1699          * 0 = getting length.
1700          * 1 = getting vnet header length.
1701          * 2 = getting data.
1702          */
1703         switch (rs->state) {
1704         case 0:
1705             l = 4 - rs->index;
1706             if (l > size) {
1707                 l = size;
1708             }
1709             memcpy(rs->buf + rs->index, buf, l);
1710             buf += l;
1711             size -= l;
1712             rs->index += l;
1713             if (rs->index == 4) {
1714                 /* got length */
1715                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1716                 rs->index = 0;
1717                 if (rs->vnet_hdr) {
1718                     rs->state = 1;
1719                 } else {
1720                     rs->state = 2;
1721                     rs->vnet_hdr_len = 0;
1722                 }
1723             }
1724             break;
1725         case 1:
1726             l = 4 - rs->index;
1727             if (l > size) {
1728                 l = size;
1729             }
1730             memcpy(rs->buf + rs->index, buf, l);
1731             buf += l;
1732             size -= l;
1733             rs->index += l;
1734             if (rs->index == 4) {
1735                 /* got vnet header length */
1736                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1737                 rs->index = 0;
1738                 rs->state = 2;
1739             }
1740             break;
1741         case 2:
1742             l = rs->packet_len - rs->index;
1743             if (l > size) {
1744                 l = size;
1745             }
1746             if (rs->index + l <= sizeof(rs->buf)) {
1747                 memcpy(rs->buf + rs->index, buf, l);
1748             } else {
1749                 fprintf(stderr, "serious error: oversized packet received,"
1750                     "connection terminated.\n");
1751                 rs->index = rs->state = 0;
1752                 return -1;
1753             }
1754
1755             rs->index += l;
1756             buf += l;
1757             size -= l;
1758             if (rs->index >= rs->packet_len) {
1759                 rs->index = 0;
1760                 rs->state = 0;
1761                 assert(rs->finalize);
1762                 rs->finalize(rs);
1763             }
1764             break;
1765         }
1766     }
1767
1768     assert(size == 0);
1769     return 0;
1770 }