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 "hw/qdev-properties.h"
  31 #include "net/slirp.h"
  32 #include "net/eth.h"
  33 #include "util.h"
  34
  35 #include "monitor/monitor.h"
  36 #include "qemu/help_option.h"
  37 #include "qapi/qapi-commands-net.h"
  38 #include "qapi/qapi-visit-net.h"
  39 #include "qapi/qmp/qdict.h"
  40 #include "qapi/qmp/qerror.h"
  41 #include "qemu/error-report.h"
  42 #include "qemu/sockets.h"
  43 #include "qemu/cutils.h"
  44 #include "qemu/config-file.h"
  45 #include "qemu/ctype.h"
  46 #include "qemu/iov.h"
  47 #include "qemu/qemu-print.h"
  48 #include "qemu/main-loop.h"
  49 #include "qemu/option.h"
  50 #include "qapi/error.h"
  51 #include "qapi/opts-visitor.h"
  52 #include "sysemu/sysemu.h"
  53 #include "sysemu/qtest.h"
  54 #include "sysemu/runstate.h"
  55 #include "sysemu/sysemu.h"
  56 #include "net/filter.h"
  57 #include "qapi/string-output-visitor.h"
  58
  59 /* Net bridge is currently not supported for W32. */
  60 #if !defined(_WIN32)
  61 # define CONFIG_NET_BRIDGE
  62 #endif
  63
  64 static VMChangeStateEntry *net_change_state_entry;
  65 static QTAILQ_HEAD(, NetClientState) net_clients;
  66
  67 /***********************************************************/
  68 /* network device redirectors */
  69
  70 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  71                     Error **errp)
  72 {
  73     gchar **substrings;
  74     struct hostent *he;
  75     const char *addr, *p, *r;
  76     int port, ret = 0;
  77
  78     substrings = g_strsplit(str, ":", 2);
  79     if (!substrings || !substrings[0] || !substrings[1]) {
  80         error_setg(errp, "host address '%s' doesn't contain ':' "
  81                    "separating host from port", str);
  82         ret = -1;
  83         goto out;
  84     }
  85
  86     addr = substrings[0];
  87     p = substrings[1];
  88
  89     saddr->sin_family = AF_INET;
  90     if (addr[0] == '\0') {
  91         saddr->sin_addr.s_addr = 0;
  92     } else {
  93         if (qemu_isdigit(addr[0])) {
  94             if (!inet_aton(addr, &saddr->sin_addr)) {
  95                 error_setg(errp, "host address '%s' is not a valid "
  96                            "IPv4 address", addr);
  97                 ret = -1;
  98                 goto out;
  99             }
 100         } else {
 101             he = gethostbyname(addr);
 102             if (he == NULL) {
 103                 error_setg(errp, "can't resolve host address '%s'", addr);
 104                 ret = -1;
 105                 goto out;
 106             }
 107             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 108         }
 109     }
 110     port = strtol(p, (char **)&r, 0);
 111     if (r == p) {
 112         error_setg(errp, "port number '%s' is invalid", p);
 113         ret = -1;
 114         goto out;
 115     }
 116     saddr->sin_port = htons(port);
 117
 118 out:
 119     g_strfreev(substrings);
 120     return ret;
 121 }
 122
 123 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 124 {
 125     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 126                            macaddr[0], macaddr[1], macaddr[2],
 127                            macaddr[3], macaddr[4], macaddr[5]);
 128 }
 129
 130 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 131 {
 132     snprintf(nc->info_str, sizeof(nc->info_str),
 133              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 134              nc->model,
 135              macaddr[0], macaddr[1], macaddr[2],
 136              macaddr[3], macaddr[4], macaddr[5]);
 137 }
 138
 139 static int mac_table[256] = {0};
 140
 141 static void qemu_macaddr_set_used(MACAddr *macaddr)
 142 {
 143     int index;
 144
 145     for (index = 0x56; index < 0xFF; index++) {
 146         if (macaddr->a[5] == index) {
 147             mac_table[index]++;
 148         }
 149     }
 150 }
 151
 152 static void qemu_macaddr_set_free(MACAddr *macaddr)
 153 {
 154     int index;
 155     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 156
 157     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 158         return;
 159     }
 160     for (index = 0x56; index < 0xFF; index++) {
 161         if (macaddr->a[5] == index) {
 162             mac_table[index]--;
 163         }
 164     }
 165 }
 166
 167 static int qemu_macaddr_get_free(void)
 168 {
 169     int index;
 170
 171     for (index = 0x56; index < 0xFF; index++) {
 172         if (mac_table[index] == 0) {
 173             return index;
 174         }
 175     }
 176
 177     return -1;
 178 }
 179
 180 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 181 {
 182     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 183     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 184
 185     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 186         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 187             return;
 188         } else {
 189             qemu_macaddr_set_used(macaddr);
 190             return;
 191         }
 192     }
 193
 194     macaddr->a[0] = 0x52;
 195     macaddr->a[1] = 0x54;
 196     macaddr->a[2] = 0x00;
 197     macaddr->a[3] = 0x12;
 198     macaddr->a[4] = 0x34;
 199     macaddr->a[5] = qemu_macaddr_get_free();
 200     qemu_macaddr_set_used(macaddr);
 201 }
 202
 203 /**
 204  * Generate a name for net client
 205  *
 206  * Only net clients created with the legacy -net option and NICs need this.
 207  */
 208 static char *assign_name(NetClientState *nc1, const char *model)
 209 {
 210     NetClientState *nc;
 211     int id = 0;
 212
 213     QTAILQ_FOREACH(nc, &net_clients, next) {
 214         if (nc == nc1) {
 215             continue;
 216         }
 217         if (strcmp(nc->model, model) == 0) {
 218             id++;
 219         }
 220     }
 221
 222     return g_strdup_printf("%s.%d", model, id);
 223 }
 224
 225 static void qemu_net_client_destructor(NetClientState *nc)
 226 {
 227     g_free(nc);
 228 }
 229 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 230                                        unsigned flags,
 231                                        const struct iovec *iov,
 232                                        int iovcnt,
 233                                        void *opaque);
 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 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
 330 {
 331     assert(nc != NULL);
 332     NetClientState *ncs = nc + queue_index;
 333     return ncs->peer;
 334 }
 335
 336 static void qemu_cleanup_net_client(NetClientState *nc)
 337 {
 338     QTAILQ_REMOVE(&net_clients, nc, next);
 339
 340     if (nc->info->cleanup) {
 341         nc->info->cleanup(nc);
 342     }
 343 }
 344
 345 static void qemu_free_net_client(NetClientState *nc)
 346 {
 347     if (nc->incoming_queue) {
 348         qemu_del_net_queue(nc->incoming_queue);
 349     }
 350     if (nc->peer) {
 351         nc->peer->peer = NULL;
 352     }
 353     g_free(nc->name);
 354     g_free(nc->model);
 355     if (nc->destructor) {
 356         nc->destructor(nc);
 357     }
 358 }
 359
 360 void qemu_del_net_client(NetClientState *nc)
 361 {
 362     NetClientState *ncs[MAX_QUEUE_NUM];
 363     int queues, i;
 364     NetFilterState *nf, *next;
 365
 366     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 367
 368     /* If the NetClientState belongs to a multiqueue backend, we will change all
 369      * other NetClientStates also.
 370      */
 371     queues = qemu_find_net_clients_except(nc->name, ncs,
 372                                           NET_CLIENT_DRIVER_NIC,
 373                                           MAX_QUEUE_NUM);
 374     assert(queues != 0);
 375
 376     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 377         object_unparent(OBJECT(nf));
 378     }
 379
 380     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 381     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 382         NICState *nic = qemu_get_nic(nc->peer);
 383         if (nic->peer_deleted) {
 384             return;
 385         }
 386         nic->peer_deleted = true;
 387
 388         for (i = 0; i < queues; i++) {
 389             ncs[i]->peer->link_down = true;
 390         }
 391
 392         if (nc->peer->info->link_status_changed) {
 393             nc->peer->info->link_status_changed(nc->peer);
 394         }
 395
 396         for (i = 0; i < queues; i++) {
 397             qemu_cleanup_net_client(ncs[i]);
 398         }
 399
 400         return;
 401     }
 402
 403     for (i = 0; i < queues; i++) {
 404         qemu_cleanup_net_client(ncs[i]);
 405         qemu_free_net_client(ncs[i]);
 406     }
 407 }
 408
 409 void qemu_del_nic(NICState *nic)
 410 {
 411     int i, queues = MAX(nic->conf->peers.queues, 1);
 412
 413     qemu_macaddr_set_free(&nic->conf->macaddr);
 414
 415     /* If this is a peer NIC and peer has already been deleted, free it now. */
 416     if (nic->peer_deleted) {
 417         for (i = 0; i < queues; i++) {
 418             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 419         }
 420     }
 421
 422     for (i = queues - 1; i >= 0; i--) {
 423         NetClientState *nc = qemu_get_subqueue(nic, i);
 424
 425         qemu_cleanup_net_client(nc);
 426         qemu_free_net_client(nc);
 427     }
 428
 429     g_free(nic);
 430 }
 431
 432 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 433 {
 434     NetClientState *nc;
 435
 436     QTAILQ_FOREACH(nc, &net_clients, next) {
 437         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 438             if (nc->queue_index == 0) {
 439                 func(qemu_get_nic(nc), opaque);
 440             }
 441         }
 442     }
 443 }
 444
 445 bool qemu_has_ufo(NetClientState *nc)
 446 {
 447     if (!nc || !nc->info->has_ufo) {
 448         return false;
 449     }
 450
 451     return nc->info->has_ufo(nc);
 452 }
 453
 454 bool qemu_has_vnet_hdr(NetClientState *nc)
 455 {
 456     if (!nc || !nc->info->has_vnet_hdr) {
 457         return false;
 458     }
 459
 460     return nc->info->has_vnet_hdr(nc);
 461 }
 462
 463 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 464 {
 465     if (!nc || !nc->info->has_vnet_hdr_len) {
 466         return false;
 467     }
 468
 469     return nc->info->has_vnet_hdr_len(nc, len);
 470 }
 471
 472 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 473 {
 474     if (!nc || !nc->info->using_vnet_hdr) {
 475         return;
 476     }
 477
 478     nc->info->using_vnet_hdr(nc, enable);
 479 }
 480
 481 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 482                           int ecn, int ufo)
 483 {
 484     if (!nc || !nc->info->set_offload) {
 485         return;
 486     }
 487
 488     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 489 }
 490
 491 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 492 {
 493     if (!nc || !nc->info->set_vnet_hdr_len) {
 494         return;
 495     }
 496
 497     nc->vnet_hdr_len = len;
 498     nc->info->set_vnet_hdr_len(nc, len);
 499 }
 500
 501 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 502 {
 503 #ifdef HOST_WORDS_BIGENDIAN
 504     if (!nc || !nc->info->set_vnet_le) {
 505         return -ENOSYS;
 506     }
 507
 508     return nc->info->set_vnet_le(nc, is_le);
 509 #else
 510     return 0;
 511 #endif
 512 }
 513
 514 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 515 {
 516 #ifdef HOST_WORDS_BIGENDIAN
 517     return 0;
 518 #else
 519     if (!nc || !nc->info->set_vnet_be) {
 520         return -ENOSYS;
 521     }
 522
 523     return nc->info->set_vnet_be(nc, is_be);
 524 #endif
 525 }
 526
 527 int qemu_can_send_packet(NetClientState *sender)
 528 {
 529     int vm_running = runstate_is_running();
 530
 531     if (!vm_running) {
 532         return 0;
 533     }
 534
 535     if (!sender->peer) {
 536         return 1;
 537     }
 538
 539     if (sender->peer->receive_disabled) {
 540         return 0;
 541     } else if (sender->peer->info->can_receive &&
 542                !sender->peer->info->can_receive(sender->peer)) {
 543         return 0;
 544     }
 545     return 1;
 546 }
 547
 548 static ssize_t filter_receive_iov(NetClientState *nc,
 549                                   NetFilterDirection direction,
 550                                   NetClientState *sender,
 551                                   unsigned flags,
 552                                   const struct iovec *iov,
 553                                   int iovcnt,
 554                                   NetPacketSent *sent_cb)
 555 {
 556     ssize_t ret = 0;
 557     NetFilterState *nf = NULL;
 558
 559     if (direction == NET_FILTER_DIRECTION_TX) {
 560         QTAILQ_FOREACH(nf, &nc->filters, next) {
 561             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 562                                          iovcnt, sent_cb);
 563             if (ret) {
 564                 return ret;
 565             }
 566         }
 567     } else {
 568         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 569             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 570                                          iovcnt, sent_cb);
 571             if (ret) {
 572                 return ret;
 573             }
 574         }
 575     }
 576
 577     return ret;
 578 }
 579
 580 static ssize_t filter_receive(NetClientState *nc,
 581                               NetFilterDirection direction,
 582                               NetClientState *sender,
 583                               unsigned flags,
 584                               const uint8_t *data,
 585                               size_t size,
 586                               NetPacketSent *sent_cb)
 587 {
 588     struct iovec iov = {
 589         .iov_base = (void *)data,
 590         .iov_len = size
 591     };
 592
 593     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 594 }
 595
 596 void qemu_purge_queued_packets(NetClientState *nc)
 597 {
 598     if (!nc->peer) {
 599         return;
 600     }
 601
 602     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 603 }
 604
 605 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 606 {
 607     nc->receive_disabled = 0;
 608
 609     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 610         if (net_hub_flush(nc->peer)) {
 611             qemu_notify_event();
 612         }
 613     }
 614     if (qemu_net_queue_flush(nc->incoming_queue)) {
 615         /* We emptied the queue successfully, signal to the IO thread to repoll
 616          * the file descriptor (for tap, for example).
 617          */
 618         qemu_notify_event();
 619     } else if (purge) {
 620         /* Unable to empty the queue, purge remaining packets */
 621         qemu_net_queue_purge(nc->incoming_queue, nc->peer);
 622     }
 623 }
 624
 625 void qemu_flush_queued_packets(NetClientState *nc)
 626 {
 627     qemu_flush_or_purge_queued_packets(nc, false);
 628 }
 629
 630 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 631                                                  unsigned flags,
 632                                                  const uint8_t *buf, int size,
 633                                                  NetPacketSent *sent_cb)
 634 {
 635     NetQueue *queue;
 636     int ret;
 637
 638 #ifdef DEBUG_NET
 639     printf("qemu_send_packet_async:\n");
 640     qemu_hexdump(stdout, "net", buf, size);
 641 #endif
 642
 643     if (sender->link_down || !sender->peer) {
 644         return size;
 645     }
 646
 647     /* Let filters handle the packet first */
 648     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 649                          sender, flags, buf, size, sent_cb);
 650     if (ret) {
 651         return ret;
 652     }
 653
 654     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 655                          sender, flags, buf, size, sent_cb);
 656     if (ret) {
 657         return ret;
 658     }
 659
 660     queue = sender->peer->incoming_queue;
 661
 662     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 663 }
 664
 665 ssize_t qemu_send_packet_async(NetClientState *sender,
 666                                const uint8_t *buf, int size,
 667                                NetPacketSent *sent_cb)
 668 {
 669     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 670                                              buf, size, sent_cb);
 671 }
 672
 673 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 674 {
 675     return qemu_send_packet_async(nc, buf, size, NULL);
 676 }
 677
 678 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 679 {
 680     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 681                                              buf, size, NULL);
 682 }
 683
 684 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 685                                int iovcnt, unsigned flags)
 686 {
 687     uint8_t *buf = NULL;
 688     uint8_t *buffer;
 689     size_t offset;
 690     ssize_t ret;
 691
 692     if (iovcnt == 1) {
 693         buffer = iov[0].iov_base;
 694         offset = iov[0].iov_len;
 695     } else {
 696         offset = iov_size(iov, iovcnt);
 697         if (offset > NET_BUFSIZE) {
 698             return -1;
 699         }
 700         buf = g_malloc(offset);
 701         buffer = buf;
 702         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 703     }
 704
 705     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 706         ret = nc->info->receive_raw(nc, buffer, offset);
 707     } else {
 708         ret = nc->info->receive(nc, buffer, offset);
 709     }
 710
 711     g_free(buf);
 712     return ret;
 713 }
 714
 715 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 716                                        unsigned flags,
 717                                        const struct iovec *iov,
 718                                        int iovcnt,
 719                                        void *opaque)
 720 {
 721     NetClientState *nc = opaque;
 722     int ret;
 723
 724
 725     if (nc->link_down) {
 726         return iov_size(iov, iovcnt);
 727     }
 728
 729     if (nc->receive_disabled) {
 730         return 0;
 731     }
 732
 733     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 734         ret = nc->info->receive_iov(nc, iov, iovcnt);
 735     } else {
 736         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 737     }
 738
 739     if (ret == 0) {
 740         nc->receive_disabled = 1;
 741     }
 742
 743     return ret;
 744 }
 745
 746 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 747                                 const struct iovec *iov, int iovcnt,
 748                                 NetPacketSent *sent_cb)
 749 {
 750     NetQueue *queue;
 751     size_t size = iov_size(iov, iovcnt);
 752     int ret;
 753
 754     if (size > NET_BUFSIZE) {
 755         return size;
 756     }
 757
 758     if (sender->link_down || !sender->peer) {
 759         return size;
 760     }
 761
 762     /* Let filters handle the packet first */
 763     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 764                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 765     if (ret) {
 766         return ret;
 767     }
 768
 769     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 770                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 771     if (ret) {
 772         return ret;
 773     }
 774
 775     queue = sender->peer->incoming_queue;
 776
 777     return qemu_net_queue_send_iov(queue, sender,
 778                                    QEMU_NET_PACKET_FLAG_NONE,
 779                                    iov, iovcnt, sent_cb);
 780 }
 781
 782 ssize_t
 783 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 784 {
 785     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 786 }
 787
 788 NetClientState *qemu_find_netdev(const char *id)
 789 {
 790     NetClientState *nc;
 791
 792     QTAILQ_FOREACH(nc, &net_clients, next) {
 793         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 794             continue;
 795         if (!strcmp(nc->name, id)) {
 796             return nc;
 797         }
 798     }
 799
 800     return NULL;
 801 }
 802
 803 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 804                                  NetClientDriver type, int max)
 805 {
 806     NetClientState *nc;
 807     int ret = 0;
 808
 809     QTAILQ_FOREACH(nc, &net_clients, next) {
 810         if (nc->info->type == type) {
 811             continue;
 812         }
 813         if (!id || !strcmp(nc->name, id)) {
 814             if (ret < max) {
 815                 ncs[ret] = nc;
 816             }
 817             ret++;
 818         }
 819     }
 820
 821     return ret;
 822 }
 823
 824 static int nic_get_free_idx(void)
 825 {
 826     int index;
 827
 828     for (index = 0; index < MAX_NICS; index++)
 829         if (!nd_table[index].used)
 830             return index;
 831     return -1;
 832 }
 833
 834 int qemu_show_nic_models(const char *arg, const char *const *models)
 835 {
 836     int i;
 837
 838     if (!arg || !is_help_option(arg)) {
 839         return 0;
 840     }
 841
 842     printf("Supported NIC models:\n");
 843     for (i = 0 ; models[i]; i++) {
 844         printf("%s\n", models[i]);
 845     }
 846     return 1;
 847 }
 848
 849 void qemu_check_nic_model(NICInfo *nd, const char *model)
 850 {
 851     const char *models[2];
 852
 853     models[0] = model;
 854     models[1] = NULL;
 855
 856     if (qemu_show_nic_models(nd->model, models))
 857         exit(0);
 858     if (qemu_find_nic_model(nd, models, model) < 0)
 859         exit(1);
 860 }
 861
 862 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 863                         const char *default_model)
 864 {
 865     int i;
 866
 867     if (!nd->model)
 868         nd->model = g_strdup(default_model);
 869
 870     for (i = 0 ; models[i]; i++) {
 871         if (strcmp(nd->model, models[i]) == 0)
 872             return i;
 873     }
 874
 875     error_report("Unsupported NIC model: %s", nd->model);
 876     return -1;
 877 }
 878
 879 static int net_init_nic(const Netdev *netdev, const char *name,
 880                         NetClientState *peer, Error **errp)
 881 {
 882     int idx;
 883     NICInfo *nd;
 884     const NetLegacyNicOptions *nic;
 885
 886     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 887     nic = &netdev->u.nic;
 888
 889     idx = nic_get_free_idx();
 890     if (idx == -1 || nb_nics >= MAX_NICS) {
 891         error_setg(errp, "too many NICs");
 892         return -1;
 893     }
 894
 895     nd = &nd_table[idx];
 896
 897     memset(nd, 0, sizeof(*nd));
 898
 899     if (nic->has_netdev) {
 900         nd->netdev = qemu_find_netdev(nic->netdev);
 901         if (!nd->netdev) {
 902             error_setg(errp, "netdev '%s' not found", nic->netdev);
 903             return -1;
 904         }
 905     } else {
 906         assert(peer);
 907         nd->netdev = peer;
 908     }
 909     nd->name = g_strdup(name);
 910     if (nic->has_model) {
 911         nd->model = g_strdup(nic->model);
 912     }
 913     if (nic->has_addr) {
 914         nd->devaddr = g_strdup(nic->addr);
 915     }
 916
 917     if (nic->has_macaddr &&
 918         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 919         error_setg(errp, "invalid syntax for ethernet address");
 920         return -1;
 921     }
 922     if (nic->has_macaddr &&
 923         is_multicast_ether_addr(nd->macaddr.a)) {
 924         error_setg(errp,
 925                    "NIC cannot have multicast MAC address (odd 1st byte)");
 926         return -1;
 927     }
 928     qemu_macaddr_default_if_unset(&nd->macaddr);
 929
 930     if (nic->has_vectors) {
 931         if (nic->vectors > 0x7ffffff) {
 932             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 933             return -1;
 934         }
 935         nd->nvectors = nic->vectors;
 936     } else {
 937         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 938     }
 939
 940     nd->used = 1;
 941     nb_nics++;
 942
 943     return idx;
 944 }
 945
 946
 947 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 948     const Netdev *netdev,
 949     const char *name,
 950     NetClientState *peer, Error **errp) = {
 951         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 952 #ifdef CONFIG_SLIRP
 953         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 954 #endif
 955         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 956         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 957 #ifdef CONFIG_VDE
 958         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 959 #endif
 960 #ifdef CONFIG_NETMAP
 961         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 962 #endif
 963 #ifdef CONFIG_NET_BRIDGE
 964         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 965 #endif
 966         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 967 #ifdef CONFIG_VHOST_NET_USER
 968         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 969 #endif
 970 #ifdef CONFIG_VHOST_NET_VDPA
 971         [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
 972 #endif
 973 #ifdef CONFIG_L2TPV3
 974         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 975 #endif
 976 };
 977
 978
 979 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
 980 {
 981     NetClientState *peer = NULL;
 982
 983     if (is_netdev) {
 984         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 985             !net_client_init_fun[netdev->type]) {
 986             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 987                        "a netdev backend type");
 988             return -1;
 989         }
 990     } else {
 991         if (netdev->type == NET_CLIENT_DRIVER_NONE) {
 992             return 0; /* nothing to do */
 993         }
 994         if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
 995             !net_client_init_fun[netdev->type]) {
 996             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 997                        "a net backend type (maybe it is not compiled "
 998                        "into this binary)");
 999             return -1;
1000         }
1001
1002         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1003         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1004             !netdev->u.nic.has_netdev) {
1005             peer = net_hub_add_port(0, NULL, NULL);
1006         }
1007     }
1008
1009     if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1010         /* FIXME drop when all init functions store an Error */
1011         if (errp && !*errp) {
1012             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1013                        NetClientDriver_str(netdev->type));
1014         }
1015         return -1;
1016     }
1017
1018     if (is_netdev) {
1019         NetClientState *nc;
1020
1021         nc = qemu_find_netdev(netdev->id);
1022         assert(nc);
1023         nc->is_netdev = true;
1024     }
1025
1026     return 0;
1027 }
1028
1029 void show_netdevs(void)
1030 {
1031     int idx;
1032     const char *available_netdevs[] = {
1033         "socket",
1034         "hubport",
1035         "tap",
1036 #ifdef CONFIG_SLIRP
1037         "user",
1038 #endif
1039 #ifdef CONFIG_L2TPV3
1040         "l2tpv3",
1041 #endif
1042 #ifdef CONFIG_VDE
1043         "vde",
1044 #endif
1045 #ifdef CONFIG_NET_BRIDGE
1046         "bridge",
1047 #endif
1048 #ifdef CONFIG_NETMAP
1049         "netmap",
1050 #endif
1051 #ifdef CONFIG_POSIX
1052         "vhost-user",
1053 #endif
1054 #ifdef CONFIG_VHOST_VDPA
1055         "vhost-vdpa",
1056 #endif
1057     };
1058
1059     qemu_printf("Available netdev backend types:\n");
1060     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1061         qemu_printf("%s\n", available_netdevs[idx]);
1062     }
1063 }
1064
1065 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1066 {
1067     gchar **substrings = NULL;
1068     Netdev *object = NULL;
1069     int ret = -1;
1070     Visitor *v = opts_visitor_new(opts);
1071
1072     /* Parse convenience option format ip6-net=fec0::0[/64] */
1073     const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1074
1075     if (ip6_net) {
1076         char *prefix_addr;
1077         unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1078
1079         substrings = g_strsplit(ip6_net, "/", 2);
1080         if (!substrings || !substrings[0]) {
1081             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1082                        "a valid IPv6 prefix");
1083             goto out;
1084         }
1085
1086         prefix_addr = substrings[0];
1087
1088         /* Handle user-specified prefix length. */
1089         if (substrings[1] &&
1090             qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1091         {
1092             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1093                        "ipv6-prefixlen", "a number");
1094             goto out;
1095         }
1096
1097         qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1098         qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1099                             &error_abort);
1100         qemu_opt_unset(opts, "ipv6-net");
1101     }
1102
1103     /* Create an ID for -net if the user did not specify one */
1104     if (!is_netdev && !qemu_opts_id(opts)) {
1105         static int idx;
1106         qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++));
1107     }
1108
1109     if (visit_type_Netdev(v, NULL, &object, errp)) {
1110         ret = net_client_init1(object, is_netdev, errp);
1111     }
1112
1113     qapi_free_Netdev(object);
1114
1115 out:
1116     g_strfreev(substrings);
1117     visit_free(v);
1118     return ret;
1119 }
1120
1121 void netdev_add(QemuOpts *opts, Error **errp)
1122 {
1123     net_client_init(opts, true, errp);
1124 }
1125
1126 void qmp_netdev_add(Netdev *netdev, Error **errp)
1127 {
1128     net_client_init1(netdev, true, errp);
1129 }
1130
1131 void qmp_netdev_del(const char *id, Error **errp)
1132 {
1133     NetClientState *nc;
1134
1135     nc = qemu_find_netdev(id);
1136     if (!nc) {
1137         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1138                   "Device '%s' not found", id);
1139         return;
1140     }
1141
1142     if (!nc->is_netdev) {
1143         error_setg(errp, "Device '%s' is not a netdev", id);
1144         return;
1145     }
1146
1147     qemu_del_net_client(nc);
1148 }
1149
1150 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1151 {
1152     char *str;
1153     ObjectProperty *prop;
1154     ObjectPropertyIterator iter;
1155     Visitor *v;
1156
1157     /* generate info str */
1158     object_property_iter_init(&iter, OBJECT(nf));
1159     while ((prop = object_property_iter_next(&iter))) {
1160         if (!strcmp(prop->name, "type")) {
1161             continue;
1162         }
1163         v = string_output_visitor_new(false, &str);
1164         object_property_get(OBJECT(nf), prop->name, v, NULL);
1165         visit_complete(v, &str);
1166         visit_free(v);
1167         monitor_printf(mon, ",%s=%s", prop->name, str);
1168         g_free(str);
1169     }
1170     monitor_printf(mon, "\n");
1171 }
1172
1173 void print_net_client(Monitor *mon, NetClientState *nc)
1174 {
1175     NetFilterState *nf;
1176
1177     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1178                    nc->queue_index,
1179                    NetClientDriver_str(nc->info->type),
1180                    nc->info_str);
1181     if (!QTAILQ_EMPTY(&nc->filters)) {
1182         monitor_printf(mon, "filters:\n");
1183     }
1184     QTAILQ_FOREACH(nf, &nc->filters, next) {
1185         monitor_printf(mon, "  - %s: type=%s",
1186                        object_get_canonical_path_component(OBJECT(nf)),
1187                        object_get_typename(OBJECT(nf)));
1188         netfilter_print_info(mon, nf);
1189     }
1190 }
1191
1192 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1193                                       Error **errp)
1194 {
1195     NetClientState *nc;
1196     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1197
1198     QTAILQ_FOREACH(nc, &net_clients, next) {
1199         RxFilterInfoList *entry;
1200         RxFilterInfo *info;
1201
1202         if (has_name && strcmp(nc->name, name) != 0) {
1203             continue;
1204         }
1205
1206         /* only query rx-filter information of NIC */
1207         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1208             if (has_name) {
1209                 error_setg(errp, "net client(%s) isn't a NIC", name);
1210                 return NULL;
1211             }
1212             continue;
1213         }
1214
1215         /* only query information on queue 0 since the info is per nic,
1216          * not per queue
1217          */
1218         if (nc->queue_index != 0)
1219             continue;
1220
1221         if (nc->info->query_rx_filter) {
1222             info = nc->info->query_rx_filter(nc);
1223             entry = g_malloc0(sizeof(*entry));
1224             entry->value = info;
1225
1226             if (!filter_list) {
1227                 filter_list = entry;
1228             } else {
1229                 last_entry->next = entry;
1230             }
1231             last_entry = entry;
1232         } else if (has_name) {
1233             error_setg(errp, "net client(%s) doesn't support"
1234                        " rx-filter querying", name);
1235             return NULL;
1236         }
1237
1238         if (has_name) {
1239             break;
1240         }
1241     }
1242
1243     if (filter_list == NULL && has_name) {
1244         error_setg(errp, "invalid net client name: %s", name);
1245     }
1246
1247     return filter_list;
1248 }
1249
1250 void hmp_info_network(Monitor *mon, const QDict *qdict)
1251 {
1252     NetClientState *nc, *peer;
1253     NetClientDriver type;
1254
1255     net_hub_info(mon);
1256
1257     QTAILQ_FOREACH(nc, &net_clients, next) {
1258         peer = nc->peer;
1259         type = nc->info->type;
1260
1261         /* Skip if already printed in hub info */
1262         if (net_hub_id_for_client(nc, NULL) == 0) {
1263             continue;
1264         }
1265
1266         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1267             print_net_client(mon, nc);
1268         } /* else it's a netdev connected to a NIC, printed with the NIC */
1269         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1270             monitor_printf(mon, " \\ ");
1271             print_net_client(mon, peer);
1272         }
1273     }
1274 }
1275
1276 void colo_notify_filters_event(int event, Error **errp)
1277 {
1278     NetClientState *nc;
1279     NetFilterState *nf;
1280     NetFilterClass *nfc = NULL;
1281     Error *local_err = NULL;
1282
1283     QTAILQ_FOREACH(nc, &net_clients, next) {
1284         QTAILQ_FOREACH(nf, &nc->filters, next) {
1285             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1286             nfc->handle_event(nf, event, &local_err);
1287             if (local_err) {
1288                 error_propagate(errp, local_err);
1289                 return;
1290             }
1291         }
1292     }
1293 }
1294
1295 void qmp_set_link(const char *name, bool up, Error **errp)
1296 {
1297     NetClientState *ncs[MAX_QUEUE_NUM];
1298     NetClientState *nc;
1299     int queues, i;
1300
1301     queues = qemu_find_net_clients_except(name, ncs,
1302                                           NET_CLIENT_DRIVER__MAX,
1303                                           MAX_QUEUE_NUM);
1304
1305     if (queues == 0) {
1306         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1307                   "Device '%s' not found", name);
1308         return;
1309     }
1310     nc = ncs[0];
1311
1312     for (i = 0; i < queues; i++) {
1313         ncs[i]->link_down = !up;
1314     }
1315
1316     if (nc->info->link_status_changed) {
1317         nc->info->link_status_changed(nc);
1318     }
1319
1320     if (nc->peer) {
1321         /* Change peer link only if the peer is NIC and then notify peer.
1322          * If the peer is a HUBPORT or a backend, we do not change the
1323          * link status.
1324          *
1325          * This behavior is compatible with qemu hubs where there could be
1326          * multiple clients that can still communicate with each other in
1327          * disconnected mode. For now maintain this compatibility.
1328          */
1329         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1330             for (i = 0; i < queues; i++) {
1331                 ncs[i]->peer->link_down = !up;
1332             }
1333         }
1334         if (nc->peer->info->link_status_changed) {
1335             nc->peer->info->link_status_changed(nc->peer);
1336         }
1337     }
1338 }
1339
1340 static void net_vm_change_state_handler(void *opaque, int running,
1341                                         RunState state)
1342 {
1343     NetClientState *nc;
1344     NetClientState *tmp;
1345
1346     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1347         if (running) {
1348             /* Flush queued packets and wake up backends. */
1349             if (nc->peer && qemu_can_send_packet(nc)) {
1350                 qemu_flush_queued_packets(nc->peer);
1351             }
1352         } else {
1353             /* Complete all queued packets, to guarantee we don't modify
1354              * state later when VM is not running.
1355              */
1356             qemu_flush_or_purge_queued_packets(nc, true);
1357         }
1358     }
1359 }
1360
1361 void net_cleanup(void)
1362 {
1363     NetClientState *nc;
1364
1365     /* We may del multiple entries during qemu_del_net_client(),
1366      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1367      */
1368     while (!QTAILQ_EMPTY(&net_clients)) {
1369         nc = QTAILQ_FIRST(&net_clients);
1370         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1371             qemu_del_nic(qemu_get_nic(nc));
1372         } else {
1373             qemu_del_net_client(nc);
1374         }
1375     }
1376
1377     qemu_del_vm_change_state_handler(net_change_state_entry);
1378 }
1379
1380 void net_check_clients(void)
1381 {
1382     NetClientState *nc;
1383     int i;
1384
1385     net_hub_check_clients();
1386
1387     QTAILQ_FOREACH(nc, &net_clients, next) {
1388         if (!nc->peer) {
1389             warn_report("%s %s has no peer",
1390                         nc->info->type == NET_CLIENT_DRIVER_NIC
1391                         ? "nic" : "netdev",
1392                         nc->name);
1393         }
1394     }
1395
1396     /* Check that all NICs requested via -net nic actually got created.
1397      * NICs created via -device don't need to be checked here because
1398      * they are always instantiated.
1399      */
1400     for (i = 0; i < MAX_NICS; i++) {
1401         NICInfo *nd = &nd_table[i];
1402         if (nd->used && !nd->instantiated) {
1403             warn_report("requested NIC (%s, model %s) "
1404                         "was not created (not supported by this machine?)",
1405                         nd->name ? nd->name : "anonymous",
1406                         nd->model ? nd->model : "unspecified");
1407         }
1408     }
1409 }
1410
1411 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1412 {
1413     return net_client_init(opts, false, errp);
1414 }
1415
1416 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1417 {
1418     const char *type = qemu_opt_get(opts, "type");
1419
1420     if (type && is_help_option(type)) {
1421         show_netdevs();
1422         exit(0);
1423     }
1424     return net_client_init(opts, true, errp);
1425 }
1426
1427 /* For the convenience "--nic" parameter */
1428 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1429 {
1430     char *mac, *nd_id;
1431     int idx, ret;
1432     NICInfo *ni;
1433     const char *type;
1434
1435     type = qemu_opt_get(opts, "type");
1436     if (type && g_str_equal(type, "none")) {
1437         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1438     }
1439
1440     idx = nic_get_free_idx();
1441     if (idx == -1 || nb_nics >= MAX_NICS) {
1442         error_setg(errp, "no more on-board/default NIC slots available");
1443         return -1;
1444     }
1445
1446     if (!type) {
1447         qemu_opt_set(opts, "type", "user", &error_abort);
1448     }
1449
1450     ni = &nd_table[idx];
1451     memset(ni, 0, sizeof(*ni));
1452     ni->model = qemu_opt_get_del(opts, "model");
1453
1454     /* Create an ID if the user did not specify one */
1455     nd_id = g_strdup(qemu_opts_id(opts));
1456     if (!nd_id) {
1457         nd_id = g_strdup_printf("__org.qemu.nic%i", idx);
1458         qemu_opts_set_id(opts, nd_id);
1459     }
1460
1461     /* Handle MAC address */
1462     mac = qemu_opt_get_del(opts, "mac");
1463     if (mac) {
1464         ret = net_parse_macaddr(ni->macaddr.a, mac);
1465         g_free(mac);
1466         if (ret) {
1467             error_setg(errp, "invalid syntax for ethernet address");
1468             goto out;
1469         }
1470         if (is_multicast_ether_addr(ni->macaddr.a)) {
1471             error_setg(errp, "NIC cannot have multicast MAC address");
1472             ret = -1;
1473             goto out;
1474         }
1475     }
1476     qemu_macaddr_default_if_unset(&ni->macaddr);
1477
1478     ret = net_client_init(opts, true, errp);
1479     if (ret == 0) {
1480         ni->netdev = qemu_find_netdev(nd_id);
1481         ni->used = true;
1482         nb_nics++;
1483     }
1484
1485 out:
1486     g_free(nd_id);
1487     return ret;
1488 }
1489
1490 int net_init_clients(Error **errp)
1491 {
1492     net_change_state_entry =
1493         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1494
1495     QTAILQ_INIT(&net_clients);
1496
1497     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1498                           net_init_netdev, NULL, errp)) {
1499         return -1;
1500     }
1501
1502     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1503         return -1;
1504     }
1505
1506     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1507         return -1;
1508     }
1509
1510     return 0;
1511 }
1512
1513 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1514 {
1515     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1516         return -1;
1517     }
1518
1519     return 0;
1520 }
1521
1522 /* From FreeBSD */
1523 /* XXX: optimize */
1524 uint32_t net_crc32(const uint8_t *p, int len)
1525 {
1526     uint32_t crc;
1527     int carry, i, j;
1528     uint8_t b;
1529
1530     crc = 0xffffffff;
1531     for (i = 0; i < len; i++) {
1532         b = *p++;
1533         for (j = 0; j < 8; j++) {
1534             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1535             crc <<= 1;
1536             b >>= 1;
1537             if (carry) {
1538                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1539             }
1540         }
1541     }
1542
1543     return crc;
1544 }
1545
1546 uint32_t net_crc32_le(const uint8_t *p, int len)
1547 {
1548     uint32_t crc;
1549     int carry, i, j;
1550     uint8_t b;
1551
1552     crc = 0xffffffff;
1553     for (i = 0; i < len; i++) {
1554         b = *p++;
1555         for (j = 0; j < 8; j++) {
1556             carry = (crc & 0x1) ^ (b & 0x01);
1557             crc >>= 1;
1558             b >>= 1;
1559             if (carry) {
1560                 crc ^= POLYNOMIAL_LE;
1561             }
1562         }
1563     }
1564
1565     return crc;
1566 }
1567
1568 QemuOptsList qemu_netdev_opts = {
1569     .name = "netdev",
1570     .implied_opt_name = "type",
1571     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1572     .desc = {
1573         /*
1574          * no elements => accept any params
1575          * validation will happen later
1576          */
1577         { /* end of list */ }
1578     },
1579 };
1580
1581 QemuOptsList qemu_nic_opts = {
1582     .name = "nic",
1583     .implied_opt_name = "type",
1584     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1585     .desc = {
1586         /*
1587          * no elements => accept any params
1588          * validation will happen later
1589          */
1590         { /* end of list */ }
1591     },
1592 };
1593
1594 QemuOptsList qemu_net_opts = {
1595     .name = "net",
1596     .implied_opt_name = "type",
1597     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1598     .desc = {
1599         /*
1600          * no elements => accept any params
1601          * validation will happen later
1602          */
1603         { /* end of list */ }
1604     },
1605 };
1606
1607 void net_socket_rs_init(SocketReadState *rs,
1608                         SocketReadStateFinalize *finalize,
1609                         bool vnet_hdr)
1610 {
1611     rs->state = 0;
1612     rs->vnet_hdr = vnet_hdr;
1613     rs->index = 0;
1614     rs->packet_len = 0;
1615     rs->vnet_hdr_len = 0;
1616     memset(rs->buf, 0, sizeof(rs->buf));
1617     rs->finalize = finalize;
1618 }
1619
1620 /*
1621  * Returns
1622  * 0: success
1623  * -1: error occurs
1624  */
1625 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1626 {
1627     unsigned int l;
1628
1629     while (size > 0) {
1630         /* Reassemble a packet from the network.
1631          * 0 = getting length.
1632          * 1 = getting vnet header length.
1633          * 2 = getting data.
1634          */
1635         switch (rs->state) {
1636         case 0:
1637             l = 4 - rs->index;
1638             if (l > size) {
1639                 l = size;
1640             }
1641             memcpy(rs->buf + rs->index, buf, l);
1642             buf += l;
1643             size -= l;
1644             rs->index += l;
1645             if (rs->index == 4) {
1646                 /* got length */
1647                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1648                 rs->index = 0;
1649                 if (rs->vnet_hdr) {
1650                     rs->state = 1;
1651                 } else {
1652                     rs->state = 2;
1653                     rs->vnet_hdr_len = 0;
1654                 }
1655             }
1656             break;
1657         case 1:
1658             l = 4 - rs->index;
1659             if (l > size) {
1660                 l = size;
1661             }
1662             memcpy(rs->buf + rs->index, buf, l);
1663             buf += l;
1664             size -= l;
1665             rs->index += l;
1666             if (rs->index == 4) {
1667                 /* got vnet header length */
1668                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1669                 rs->index = 0;
1670                 rs->state = 2;
1671             }
1672             break;
1673         case 2:
1674             l = rs->packet_len - rs->index;
1675             if (l > size) {
1676                 l = size;
1677             }
1678             if (rs->index + l <= sizeof(rs->buf)) {
1679                 memcpy(rs->buf + rs->index, buf, l);
1680             } else {
1681                 fprintf(stderr, "serious error: oversized packet received,"
1682                     "connection terminated.\n");
1683                 rs->index = rs->state = 0;
1684                 return -1;
1685             }
1686
1687             rs->index += l;
1688             buf += l;
1689             size -= l;
1690             if (rs->index >= rs->packet_len) {
1691                 rs->index = 0;
1692                 rs->state = 0;
1693                 assert(rs->finalize);
1694                 rs->finalize(rs);
1695             }
1696             break;
1697         }
1698     }
1699
1700     assert(size == 0);
1701     return 0;
1702 }