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