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     for (i = 0; i < queues; i++) {
 416         NetClientState *nc = qemu_get_subqueue(nic, i);
 417         /* If this is a peer NIC and peer has already been deleted, free it now. */
 418         if (nic->peer_deleted) {
 419             qemu_free_net_client(nc->peer);
 420         } else if (nc->peer) {
 421             /* if there are RX packets pending, complete them */
 422             qemu_purge_queued_packets(nc->peer);
 423         }
 424     }
 425
 426     for (i = queues - 1; i >= 0; i--) {
 427         NetClientState *nc = qemu_get_subqueue(nic, i);
 428
 429         qemu_cleanup_net_client(nc);
 430         qemu_free_net_client(nc);
 431     }
 432
 433     g_free(nic);
 434 }
 435
 436 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 437 {
 438     NetClientState *nc;
 439
 440     QTAILQ_FOREACH(nc, &net_clients, next) {
 441         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 442             if (nc->queue_index == 0) {
 443                 func(qemu_get_nic(nc), opaque);
 444             }
 445         }
 446     }
 447 }
 448
 449 bool qemu_has_ufo(NetClientState *nc)
 450 {
 451     if (!nc || !nc->info->has_ufo) {
 452         return false;
 453     }
 454
 455     return nc->info->has_ufo(nc);
 456 }
 457
 458 bool qemu_has_vnet_hdr(NetClientState *nc)
 459 {
 460     if (!nc || !nc->info->has_vnet_hdr) {
 461         return false;
 462     }
 463
 464     return nc->info->has_vnet_hdr(nc);
 465 }
 466
 467 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 468 {
 469     if (!nc || !nc->info->has_vnet_hdr_len) {
 470         return false;
 471     }
 472
 473     return nc->info->has_vnet_hdr_len(nc, len);
 474 }
 475
 476 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 477 {
 478     if (!nc || !nc->info->using_vnet_hdr) {
 479         return;
 480     }
 481
 482     nc->info->using_vnet_hdr(nc, enable);
 483 }
 484
 485 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 486                           int ecn, int ufo)
 487 {
 488     if (!nc || !nc->info->set_offload) {
 489         return;
 490     }
 491
 492     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 493 }
 494
 495 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 496 {
 497     if (!nc || !nc->info->set_vnet_hdr_len) {
 498         return;
 499     }
 500
 501     nc->vnet_hdr_len = len;
 502     nc->info->set_vnet_hdr_len(nc, len);
 503 }
 504
 505 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 506 {
 507 #ifdef HOST_WORDS_BIGENDIAN
 508     if (!nc || !nc->info->set_vnet_le) {
 509         return -ENOSYS;
 510     }
 511
 512     return nc->info->set_vnet_le(nc, is_le);
 513 #else
 514     return 0;
 515 #endif
 516 }
 517
 518 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 519 {
 520 #ifdef HOST_WORDS_BIGENDIAN
 521     return 0;
 522 #else
 523     if (!nc || !nc->info->set_vnet_be) {
 524         return -ENOSYS;
 525     }
 526
 527     return nc->info->set_vnet_be(nc, is_be);
 528 #endif
 529 }
 530
 531 int qemu_can_send_packet(NetClientState *sender)
 532 {
 533     int vm_running = runstate_is_running();
 534
 535     if (!vm_running) {
 536         return 0;
 537     }
 538
 539     if (!sender->peer) {
 540         return 1;
 541     }
 542
 543     if (sender->peer->receive_disabled) {
 544         return 0;
 545     } else if (sender->peer->info->can_receive &&
 546                !sender->peer->info->can_receive(sender->peer)) {
 547         return 0;
 548     }
 549     return 1;
 550 }
 551
 552 static ssize_t filter_receive_iov(NetClientState *nc,
 553                                   NetFilterDirection direction,
 554                                   NetClientState *sender,
 555                                   unsigned flags,
 556                                   const struct iovec *iov,
 557                                   int iovcnt,
 558                                   NetPacketSent *sent_cb)
 559 {
 560     ssize_t ret = 0;
 561     NetFilterState *nf = NULL;
 562
 563     if (direction == NET_FILTER_DIRECTION_TX) {
 564         QTAILQ_FOREACH(nf, &nc->filters, next) {
 565             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 566                                          iovcnt, sent_cb);
 567             if (ret) {
 568                 return ret;
 569             }
 570         }
 571     } else {
 572         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 573             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 574                                          iovcnt, sent_cb);
 575             if (ret) {
 576                 return ret;
 577             }
 578         }
 579     }
 580
 581     return ret;
 582 }
 583
 584 static ssize_t filter_receive(NetClientState *nc,
 585                               NetFilterDirection direction,
 586                               NetClientState *sender,
 587                               unsigned flags,
 588                               const uint8_t *data,
 589                               size_t size,
 590                               NetPacketSent *sent_cb)
 591 {
 592     struct iovec iov = {
 593         .iov_base = (void *)data,
 594         .iov_len = size
 595     };
 596
 597     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 598 }
 599
 600 void qemu_purge_queued_packets(NetClientState *nc)
 601 {
 602     if (!nc->peer) {
 603         return;
 604     }
 605
 606     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 607 }
 608
 609 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 610 {
 611     nc->receive_disabled = 0;
 612
 613     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 614         if (net_hub_flush(nc->peer)) {
 615             qemu_notify_event();
 616         }
 617     }
 618     if (qemu_net_queue_flush(nc->incoming_queue)) {
 619         /* We emptied the queue successfully, signal to the IO thread to repoll
 620          * the file descriptor (for tap, for example).
 621          */
 622         qemu_notify_event();
 623     } else if (purge) {
 624         /* Unable to empty the queue, purge remaining packets */
 625         qemu_net_queue_purge(nc->incoming_queue, nc->peer);
 626     }
 627 }
 628
 629 void qemu_flush_queued_packets(NetClientState *nc)
 630 {
 631     qemu_flush_or_purge_queued_packets(nc, false);
 632 }
 633
 634 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 635                                                  unsigned flags,
 636                                                  const uint8_t *buf, int size,
 637                                                  NetPacketSent *sent_cb)
 638 {
 639     NetQueue *queue;
 640     int ret;
 641
 642 #ifdef DEBUG_NET
 643     printf("qemu_send_packet_async:\n");
 644     qemu_hexdump(stdout, "net", buf, size);
 645 #endif
 646
 647     if (sender->link_down || !sender->peer) {
 648         return size;
 649     }
 650
 651     /* Let filters handle the packet first */
 652     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 653                          sender, flags, buf, size, sent_cb);
 654     if (ret) {
 655         return ret;
 656     }
 657
 658     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 659                          sender, flags, buf, size, sent_cb);
 660     if (ret) {
 661         return ret;
 662     }
 663
 664     queue = sender->peer->incoming_queue;
 665
 666     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 667 }
 668
 669 ssize_t qemu_send_packet_async(NetClientState *sender,
 670                                const uint8_t *buf, int size,
 671                                NetPacketSent *sent_cb)
 672 {
 673     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 674                                              buf, size, sent_cb);
 675 }
 676
 677 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 678 {
 679     return qemu_send_packet_async(nc, buf, size, NULL);
 680 }
 681
 682 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 683 {
 684     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 685                                              buf, size, NULL);
 686 }
 687
 688 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 689                                int iovcnt, unsigned flags)
 690 {
 691     uint8_t *buf = NULL;
 692     uint8_t *buffer;
 693     size_t offset;
 694     ssize_t ret;
 695
 696     if (iovcnt == 1) {
 697         buffer = iov[0].iov_base;
 698         offset = iov[0].iov_len;
 699     } else {
 700         offset = iov_size(iov, iovcnt);
 701         if (offset > NET_BUFSIZE) {
 702             return -1;
 703         }
 704         buf = g_malloc(offset);
 705         buffer = buf;
 706         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 707     }
 708
 709     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 710         ret = nc->info->receive_raw(nc, buffer, offset);
 711     } else {
 712         ret = nc->info->receive(nc, buffer, offset);
 713     }
 714
 715     g_free(buf);
 716     return ret;
 717 }
 718
 719 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 720                                        unsigned flags,
 721                                        const struct iovec *iov,
 722                                        int iovcnt,
 723                                        void *opaque)
 724 {
 725     NetClientState *nc = opaque;
 726     int ret;
 727
 728
 729     if (nc->link_down) {
 730         return iov_size(iov, iovcnt);
 731     }
 732
 733     if (nc->receive_disabled) {
 734         return 0;
 735     }
 736
 737     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 738         ret = nc->info->receive_iov(nc, iov, iovcnt);
 739     } else {
 740         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 741     }
 742
 743     if (ret == 0) {
 744         nc->receive_disabled = 1;
 745     }
 746
 747     return ret;
 748 }
 749
 750 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 751                                 const struct iovec *iov, int iovcnt,
 752                                 NetPacketSent *sent_cb)
 753 {
 754     NetQueue *queue;
 755     size_t size = iov_size(iov, iovcnt);
 756     int ret;
 757
 758     if (size > NET_BUFSIZE) {
 759         return size;
 760     }
 761
 762     if (sender->link_down || !sender->peer) {
 763         return size;
 764     }
 765
 766     /* Let filters handle the packet first */
 767     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 768                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 769     if (ret) {
 770         return ret;
 771     }
 772
 773     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 774                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 775     if (ret) {
 776         return ret;
 777     }
 778
 779     queue = sender->peer->incoming_queue;
 780
 781     return qemu_net_queue_send_iov(queue, sender,
 782                                    QEMU_NET_PACKET_FLAG_NONE,
 783                                    iov, iovcnt, sent_cb);
 784 }
 785
 786 ssize_t
 787 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 788 {
 789     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 790 }
 791
 792 NetClientState *qemu_find_netdev(const char *id)
 793 {
 794     NetClientState *nc;
 795
 796     QTAILQ_FOREACH(nc, &net_clients, next) {
 797         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 798             continue;
 799         if (!strcmp(nc->name, id)) {
 800             return nc;
 801         }
 802     }
 803
 804     return NULL;
 805 }
 806
 807 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 808                                  NetClientDriver type, int max)
 809 {
 810     NetClientState *nc;
 811     int ret = 0;
 812
 813     QTAILQ_FOREACH(nc, &net_clients, next) {
 814         if (nc->info->type == type) {
 815             continue;
 816         }
 817         if (!id || !strcmp(nc->name, id)) {
 818             if (ret < max) {
 819                 ncs[ret] = nc;
 820             }
 821             ret++;
 822         }
 823     }
 824
 825     return ret;
 826 }
 827
 828 static int nic_get_free_idx(void)
 829 {
 830     int index;
 831
 832     for (index = 0; index < MAX_NICS; index++)
 833         if (!nd_table[index].used)
 834             return index;
 835     return -1;
 836 }
 837
 838 int qemu_show_nic_models(const char *arg, const char *const *models)
 839 {
 840     int i;
 841
 842     if (!arg || !is_help_option(arg)) {
 843         return 0;
 844     }
 845
 846     printf("Supported NIC models:\n");
 847     for (i = 0 ; models[i]; i++) {
 848         printf("%s\n", models[i]);
 849     }
 850     return 1;
 851 }
 852
 853 void qemu_check_nic_model(NICInfo *nd, const char *model)
 854 {
 855     const char *models[2];
 856
 857     models[0] = model;
 858     models[1] = NULL;
 859
 860     if (qemu_show_nic_models(nd->model, models))
 861         exit(0);
 862     if (qemu_find_nic_model(nd, models, model) < 0)
 863         exit(1);
 864 }
 865
 866 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 867                         const char *default_model)
 868 {
 869     int i;
 870
 871     if (!nd->model)
 872         nd->model = g_strdup(default_model);
 873
 874     for (i = 0 ; models[i]; i++) {
 875         if (strcmp(nd->model, models[i]) == 0)
 876             return i;
 877     }
 878
 879     error_report("Unsupported NIC model: %s", nd->model);
 880     return -1;
 881 }
 882
 883 static int net_init_nic(const Netdev *netdev, const char *name,
 884                         NetClientState *peer, Error **errp)
 885 {
 886     int idx;
 887     NICInfo *nd;
 888     const NetLegacyNicOptions *nic;
 889
 890     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 891     nic = &netdev->u.nic;
 892
 893     idx = nic_get_free_idx();
 894     if (idx == -1 || nb_nics >= MAX_NICS) {
 895         error_setg(errp, "too many NICs");
 896         return -1;
 897     }
 898
 899     nd = &nd_table[idx];
 900
 901     memset(nd, 0, sizeof(*nd));
 902
 903     if (nic->has_netdev) {
 904         nd->netdev = qemu_find_netdev(nic->netdev);
 905         if (!nd->netdev) {
 906             error_setg(errp, "netdev '%s' not found", nic->netdev);
 907             return -1;
 908         }
 909     } else {
 910         assert(peer);
 911         nd->netdev = peer;
 912     }
 913     nd->name = g_strdup(name);
 914     if (nic->has_model) {
 915         nd->model = g_strdup(nic->model);
 916     }
 917     if (nic->has_addr) {
 918         nd->devaddr = g_strdup(nic->addr);
 919     }
 920
 921     if (nic->has_macaddr &&
 922         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 923         error_setg(errp, "invalid syntax for ethernet address");
 924         return -1;
 925     }
 926     if (nic->has_macaddr &&
 927         is_multicast_ether_addr(nd->macaddr.a)) {
 928         error_setg(errp,
 929                    "NIC cannot have multicast MAC address (odd 1st byte)");
 930         return -1;
 931     }
 932     qemu_macaddr_default_if_unset(&nd->macaddr);
 933
 934     if (nic->has_vectors) {
 935         if (nic->vectors > 0x7ffffff) {
 936             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 937             return -1;
 938         }
 939         nd->nvectors = nic->vectors;
 940     } else {
 941         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 942     }
 943
 944     nd->used = 1;
 945     nb_nics++;
 946
 947     return idx;
 948 }
 949
 950
 951 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 952     const Netdev *netdev,
 953     const char *name,
 954     NetClientState *peer, Error **errp) = {
 955         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 956 #ifdef CONFIG_SLIRP
 957         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 958 #endif
 959         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 960         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 961 #ifdef CONFIG_VDE
 962         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 963 #endif
 964 #ifdef CONFIG_NETMAP
 965         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 966 #endif
 967 #ifdef CONFIG_NET_BRIDGE
 968         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 969 #endif
 970         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 971 #ifdef CONFIG_VHOST_NET_USER
 972         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 973 #endif
 974 #ifdef CONFIG_VHOST_NET_VDPA
 975         [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
 976 #endif
 977 #ifdef CONFIG_L2TPV3
 978         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 979 #endif
 980 };
 981
 982
 983 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
 984 {
 985     NetClientState *peer = NULL;
 986     NetClientState *nc;
 987
 988     if (is_netdev) {
 989         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 990             !net_client_init_fun[netdev->type]) {
 991             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 992                        "a netdev backend type");
 993             return -1;
 994         }
 995     } else {
 996         if (netdev->type == NET_CLIENT_DRIVER_NONE) {
 997             return 0; /* nothing to do */
 998         }
 999         if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
1000             !net_client_init_fun[netdev->type]) {
1001             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1002                        "a net backend type (maybe it is not compiled "
1003                        "into this binary)");
1004             return -1;
1005         }
1006
1007         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1008         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1009             !netdev->u.nic.has_netdev) {
1010             peer = net_hub_add_port(0, NULL, NULL);
1011         }
1012     }
1013
1014     nc = qemu_find_netdev(netdev->id);
1015     if (nc) {
1016         error_setg(errp, "Duplicate ID '%s'", netdev->id);
1017         return -1;
1018     }
1019
1020     if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1021         /* FIXME drop when all init functions store an Error */
1022         if (errp && !*errp) {
1023             error_setg(errp, "Device '%s' could not be initialized",
1024                        NetClientDriver_str(netdev->type));
1025         }
1026         return -1;
1027     }
1028
1029     if (is_netdev) {
1030         nc = qemu_find_netdev(netdev->id);
1031         assert(nc);
1032         nc->is_netdev = true;
1033     }
1034
1035     return 0;
1036 }
1037
1038 void show_netdevs(void)
1039 {
1040     int idx;
1041     const char *available_netdevs[] = {
1042         "socket",
1043         "hubport",
1044         "tap",
1045 #ifdef CONFIG_SLIRP
1046         "user",
1047 #endif
1048 #ifdef CONFIG_L2TPV3
1049         "l2tpv3",
1050 #endif
1051 #ifdef CONFIG_VDE
1052         "vde",
1053 #endif
1054 #ifdef CONFIG_NET_BRIDGE
1055         "bridge",
1056 #endif
1057 #ifdef CONFIG_NETMAP
1058         "netmap",
1059 #endif
1060 #ifdef CONFIG_POSIX
1061         "vhost-user",
1062 #endif
1063 #ifdef CONFIG_VHOST_VDPA
1064         "vhost-vdpa",
1065 #endif
1066     };
1067
1068     qemu_printf("Available netdev backend types:\n");
1069     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1070         qemu_printf("%s\n", available_netdevs[idx]);
1071     }
1072 }
1073
1074 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1075 {
1076     gchar **substrings = NULL;
1077     Netdev *object = NULL;
1078     int ret = -1;
1079     Visitor *v = opts_visitor_new(opts);
1080
1081     /* Parse convenience option format ip6-net=fec0::0[/64] */
1082     const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1083
1084     if (ip6_net) {
1085         char *prefix_addr;
1086         unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1087
1088         substrings = g_strsplit(ip6_net, "/", 2);
1089         if (!substrings || !substrings[0]) {
1090             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1091                        "a valid IPv6 prefix");
1092             goto out;
1093         }
1094
1095         prefix_addr = substrings[0];
1096
1097         /* Handle user-specified prefix length. */
1098         if (substrings[1] &&
1099             qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1100         {
1101             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1102                        "ipv6-prefixlen", "a number");
1103             goto out;
1104         }
1105
1106         qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1107         qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1108                             &error_abort);
1109         qemu_opt_unset(opts, "ipv6-net");
1110     }
1111
1112     /* Create an ID for -net if the user did not specify one */
1113     if (!is_netdev && !qemu_opts_id(opts)) {
1114         static int idx;
1115         qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++));
1116     }
1117
1118     if (visit_type_Netdev(v, NULL, &object, errp)) {
1119         ret = net_client_init1(object, is_netdev, errp);
1120     }
1121
1122     qapi_free_Netdev(object);
1123
1124 out:
1125     g_strfreev(substrings);
1126     visit_free(v);
1127     return ret;
1128 }
1129
1130 void netdev_add(QemuOpts *opts, Error **errp)
1131 {
1132     net_client_init(opts, true, errp);
1133 }
1134
1135 void qmp_netdev_add(Netdev *netdev, Error **errp)
1136 {
1137     net_client_init1(netdev, true, errp);
1138 }
1139
1140 void qmp_netdev_del(const char *id, Error **errp)
1141 {
1142     NetClientState *nc;
1143     QemuOpts *opts;
1144
1145     nc = qemu_find_netdev(id);
1146     if (!nc) {
1147         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1148                   "Device '%s' not found", id);
1149         return;
1150     }
1151
1152     if (!nc->is_netdev) {
1153         error_setg(errp, "Device '%s' is not a netdev", id);
1154         return;
1155     }
1156
1157     qemu_del_net_client(nc);
1158
1159     /*
1160      * Wart: we need to delete the QemuOpts associated with netdevs
1161      * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in
1162      * HMP netdev_add.
1163      */
1164     opts = qemu_opts_find(qemu_find_opts("netdev"), id);
1165     if (opts) {
1166         qemu_opts_del(opts);
1167     }
1168 }
1169
1170 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1171 {
1172     char *str;
1173     ObjectProperty *prop;
1174     ObjectPropertyIterator iter;
1175     Visitor *v;
1176
1177     /* generate info str */
1178     object_property_iter_init(&iter, OBJECT(nf));
1179     while ((prop = object_property_iter_next(&iter))) {
1180         if (!strcmp(prop->name, "type")) {
1181             continue;
1182         }
1183         v = string_output_visitor_new(false, &str);
1184         object_property_get(OBJECT(nf), prop->name, v, NULL);
1185         visit_complete(v, &str);
1186         visit_free(v);
1187         monitor_printf(mon, ",%s=%s", prop->name, str);
1188         g_free(str);
1189     }
1190     monitor_printf(mon, "\n");
1191 }
1192
1193 void print_net_client(Monitor *mon, NetClientState *nc)
1194 {
1195     NetFilterState *nf;
1196
1197     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1198                    nc->queue_index,
1199                    NetClientDriver_str(nc->info->type),
1200                    nc->info_str);
1201     if (!QTAILQ_EMPTY(&nc->filters)) {
1202         monitor_printf(mon, "filters:\n");
1203     }
1204     QTAILQ_FOREACH(nf, &nc->filters, next) {
1205         monitor_printf(mon, "  - %s: type=%s",
1206                        object_get_canonical_path_component(OBJECT(nf)),
1207                        object_get_typename(OBJECT(nf)));
1208         netfilter_print_info(mon, nf);
1209     }
1210 }
1211
1212 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1213                                       Error **errp)
1214 {
1215     NetClientState *nc;
1216     RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
1217
1218     QTAILQ_FOREACH(nc, &net_clients, next) {
1219         RxFilterInfo *info;
1220
1221         if (has_name && strcmp(nc->name, name) != 0) {
1222             continue;
1223         }
1224
1225         /* only query rx-filter information of NIC */
1226         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1227             if (has_name) {
1228                 error_setg(errp, "net client(%s) isn't a NIC", name);
1229                 assert(!filter_list);
1230                 return NULL;
1231             }
1232             continue;
1233         }
1234
1235         /* only query information on queue 0 since the info is per nic,
1236          * not per queue
1237          */
1238         if (nc->queue_index != 0)
1239             continue;
1240
1241         if (nc->info->query_rx_filter) {
1242             info = nc->info->query_rx_filter(nc);
1243             QAPI_LIST_APPEND(tail, info);
1244         } else if (has_name) {
1245             error_setg(errp, "net client(%s) doesn't support"
1246                        " rx-filter querying", name);
1247             assert(!filter_list);
1248             return NULL;
1249         }
1250
1251         if (has_name) {
1252             break;
1253         }
1254     }
1255
1256     if (filter_list == NULL && has_name) {
1257         error_setg(errp, "invalid net client name: %s", name);
1258     }
1259
1260     return filter_list;
1261 }
1262
1263 void hmp_info_network(Monitor *mon, const QDict *qdict)
1264 {
1265     NetClientState *nc, *peer;
1266     NetClientDriver type;
1267
1268     net_hub_info(mon);
1269
1270     QTAILQ_FOREACH(nc, &net_clients, next) {
1271         peer = nc->peer;
1272         type = nc->info->type;
1273
1274         /* Skip if already printed in hub info */
1275         if (net_hub_id_for_client(nc, NULL) == 0) {
1276             continue;
1277         }
1278
1279         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1280             print_net_client(mon, nc);
1281         } /* else it's a netdev connected to a NIC, printed with the NIC */
1282         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1283             monitor_printf(mon, " \\ ");
1284             print_net_client(mon, peer);
1285         }
1286     }
1287 }
1288
1289 void colo_notify_filters_event(int event, Error **errp)
1290 {
1291     NetClientState *nc;
1292     NetFilterState *nf;
1293     NetFilterClass *nfc = NULL;
1294     Error *local_err = NULL;
1295
1296     QTAILQ_FOREACH(nc, &net_clients, next) {
1297         QTAILQ_FOREACH(nf, &nc->filters, next) {
1298             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1299             nfc->handle_event(nf, event, &local_err);
1300             if (local_err) {
1301                 error_propagate(errp, local_err);
1302                 return;
1303             }
1304         }
1305     }
1306 }
1307
1308 void qmp_set_link(const char *name, bool up, Error **errp)
1309 {
1310     NetClientState *ncs[MAX_QUEUE_NUM];
1311     NetClientState *nc;
1312     int queues, i;
1313
1314     queues = qemu_find_net_clients_except(name, ncs,
1315                                           NET_CLIENT_DRIVER__MAX,
1316                                           MAX_QUEUE_NUM);
1317
1318     if (queues == 0) {
1319         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1320                   "Device '%s' not found", name);
1321         return;
1322     }
1323     nc = ncs[0];
1324
1325     for (i = 0; i < queues; i++) {
1326         ncs[i]->link_down = !up;
1327     }
1328
1329     if (nc->info->link_status_changed) {
1330         nc->info->link_status_changed(nc);
1331     }
1332
1333     if (nc->peer) {
1334         /* Change peer link only if the peer is NIC and then notify peer.
1335          * If the peer is a HUBPORT or a backend, we do not change the
1336          * link status.
1337          *
1338          * This behavior is compatible with qemu hubs where there could be
1339          * multiple clients that can still communicate with each other in
1340          * disconnected mode. For now maintain this compatibility.
1341          */
1342         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1343             for (i = 0; i < queues; i++) {
1344                 ncs[i]->peer->link_down = !up;
1345             }
1346         }
1347         if (nc->peer->info->link_status_changed) {
1348             nc->peer->info->link_status_changed(nc->peer);
1349         }
1350     }
1351 }
1352
1353 static void net_vm_change_state_handler(void *opaque, int running,
1354                                         RunState state)
1355 {
1356     NetClientState *nc;
1357     NetClientState *tmp;
1358
1359     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1360         if (running) {
1361             /* Flush queued packets and wake up backends. */
1362             if (nc->peer && qemu_can_send_packet(nc)) {
1363                 qemu_flush_queued_packets(nc->peer);
1364             }
1365         } else {
1366             /* Complete all queued packets, to guarantee we don't modify
1367              * state later when VM is not running.
1368              */
1369             qemu_flush_or_purge_queued_packets(nc, true);
1370         }
1371     }
1372 }
1373
1374 void net_cleanup(void)
1375 {
1376     NetClientState *nc;
1377
1378     /* We may del multiple entries during qemu_del_net_client(),
1379      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1380      */
1381     while (!QTAILQ_EMPTY(&net_clients)) {
1382         nc = QTAILQ_FIRST(&net_clients);
1383         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1384             qemu_del_nic(qemu_get_nic(nc));
1385         } else {
1386             qemu_del_net_client(nc);
1387         }
1388     }
1389
1390     qemu_del_vm_change_state_handler(net_change_state_entry);
1391 }
1392
1393 void net_check_clients(void)
1394 {
1395     NetClientState *nc;
1396     int i;
1397
1398     net_hub_check_clients();
1399
1400     QTAILQ_FOREACH(nc, &net_clients, next) {
1401         if (!nc->peer) {
1402             warn_report("%s %s has no peer",
1403                         nc->info->type == NET_CLIENT_DRIVER_NIC
1404                         ? "nic" : "netdev",
1405                         nc->name);
1406         }
1407     }
1408
1409     /* Check that all NICs requested via -net nic actually got created.
1410      * NICs created via -device don't need to be checked here because
1411      * they are always instantiated.
1412      */
1413     for (i = 0; i < MAX_NICS; i++) {
1414         NICInfo *nd = &nd_table[i];
1415         if (nd->used && !nd->instantiated) {
1416             warn_report("requested NIC (%s, model %s) "
1417                         "was not created (not supported by this machine?)",
1418                         nd->name ? nd->name : "anonymous",
1419                         nd->model ? nd->model : "unspecified");
1420         }
1421     }
1422 }
1423
1424 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1425 {
1426     return net_client_init(opts, false, errp);
1427 }
1428
1429 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1430 {
1431     const char *type = qemu_opt_get(opts, "type");
1432
1433     if (type && is_help_option(type)) {
1434         show_netdevs();
1435         exit(0);
1436     }
1437     return net_client_init(opts, true, errp);
1438 }
1439
1440 /* For the convenience "--nic" parameter */
1441 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1442 {
1443     char *mac, *nd_id;
1444     int idx, ret;
1445     NICInfo *ni;
1446     const char *type;
1447
1448     type = qemu_opt_get(opts, "type");
1449     if (type && g_str_equal(type, "none")) {
1450         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1451     }
1452
1453     idx = nic_get_free_idx();
1454     if (idx == -1 || nb_nics >= MAX_NICS) {
1455         error_setg(errp, "no more on-board/default NIC slots available");
1456         return -1;
1457     }
1458
1459     if (!type) {
1460         qemu_opt_set(opts, "type", "user", &error_abort);
1461     }
1462
1463     ni = &nd_table[idx];
1464     memset(ni, 0, sizeof(*ni));
1465     ni->model = qemu_opt_get_del(opts, "model");
1466
1467     /* Create an ID if the user did not specify one */
1468     nd_id = g_strdup(qemu_opts_id(opts));
1469     if (!nd_id) {
1470         nd_id = g_strdup_printf("__org.qemu.nic%i", idx);
1471         qemu_opts_set_id(opts, nd_id);
1472     }
1473
1474     /* Handle MAC address */
1475     mac = qemu_opt_get_del(opts, "mac");
1476     if (mac) {
1477         ret = net_parse_macaddr(ni->macaddr.a, mac);
1478         g_free(mac);
1479         if (ret) {
1480             error_setg(errp, "invalid syntax for ethernet address");
1481             goto out;
1482         }
1483         if (is_multicast_ether_addr(ni->macaddr.a)) {
1484             error_setg(errp, "NIC cannot have multicast MAC address");
1485             ret = -1;
1486             goto out;
1487         }
1488     }
1489     qemu_macaddr_default_if_unset(&ni->macaddr);
1490
1491     ret = net_client_init(opts, true, errp);
1492     if (ret == 0) {
1493         ni->netdev = qemu_find_netdev(nd_id);
1494         ni->used = true;
1495         nb_nics++;
1496     }
1497
1498 out:
1499     g_free(nd_id);
1500     return ret;
1501 }
1502
1503 int net_init_clients(Error **errp)
1504 {
1505     net_change_state_entry =
1506         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1507
1508     QTAILQ_INIT(&net_clients);
1509
1510     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1511                           net_init_netdev, NULL, errp)) {
1512         return -1;
1513     }
1514
1515     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1516         return -1;
1517     }
1518
1519     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1520         return -1;
1521     }
1522
1523     return 0;
1524 }
1525
1526 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1527 {
1528     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1529         return -1;
1530     }
1531
1532     return 0;
1533 }
1534
1535 /* From FreeBSD */
1536 /* XXX: optimize */
1537 uint32_t net_crc32(const uint8_t *p, int len)
1538 {
1539     uint32_t crc;
1540     int carry, i, j;
1541     uint8_t b;
1542
1543     crc = 0xffffffff;
1544     for (i = 0; i < len; i++) {
1545         b = *p++;
1546         for (j = 0; j < 8; j++) {
1547             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1548             crc <<= 1;
1549             b >>= 1;
1550             if (carry) {
1551                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1552             }
1553         }
1554     }
1555
1556     return crc;
1557 }
1558
1559 uint32_t net_crc32_le(const uint8_t *p, int len)
1560 {
1561     uint32_t crc;
1562     int carry, i, j;
1563     uint8_t b;
1564
1565     crc = 0xffffffff;
1566     for (i = 0; i < len; i++) {
1567         b = *p++;
1568         for (j = 0; j < 8; j++) {
1569             carry = (crc & 0x1) ^ (b & 0x01);
1570             crc >>= 1;
1571             b >>= 1;
1572             if (carry) {
1573                 crc ^= POLYNOMIAL_LE;
1574             }
1575         }
1576     }
1577
1578     return crc;
1579 }
1580
1581 QemuOptsList qemu_netdev_opts = {
1582     .name = "netdev",
1583     .implied_opt_name = "type",
1584     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_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_nic_opts = {
1595     .name = "nic",
1596     .implied_opt_name = "type",
1597     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_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 QemuOptsList qemu_net_opts = {
1608     .name = "net",
1609     .implied_opt_name = "type",
1610     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1611     .desc = {
1612         /*
1613          * no elements => accept any params
1614          * validation will happen later
1615          */
1616         { /* end of list */ }
1617     },
1618 };
1619
1620 void net_socket_rs_init(SocketReadState *rs,
1621                         SocketReadStateFinalize *finalize,
1622                         bool vnet_hdr)
1623 {
1624     rs->state = 0;
1625     rs->vnet_hdr = vnet_hdr;
1626     rs->index = 0;
1627     rs->packet_len = 0;
1628     rs->vnet_hdr_len = 0;
1629     memset(rs->buf, 0, sizeof(rs->buf));
1630     rs->finalize = finalize;
1631 }
1632
1633 /*
1634  * Returns
1635  * 0: success
1636  * -1: error occurs
1637  */
1638 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1639 {
1640     unsigned int l;
1641
1642     while (size > 0) {
1643         /* Reassemble a packet from the network.
1644          * 0 = getting length.
1645          * 1 = getting vnet header length.
1646          * 2 = getting data.
1647          */
1648         switch (rs->state) {
1649         case 0:
1650             l = 4 - rs->index;
1651             if (l > size) {
1652                 l = size;
1653             }
1654             memcpy(rs->buf + rs->index, buf, l);
1655             buf += l;
1656             size -= l;
1657             rs->index += l;
1658             if (rs->index == 4) {
1659                 /* got length */
1660                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1661                 rs->index = 0;
1662                 if (rs->vnet_hdr) {
1663                     rs->state = 1;
1664                 } else {
1665                     rs->state = 2;
1666                     rs->vnet_hdr_len = 0;
1667                 }
1668             }
1669             break;
1670         case 1:
1671             l = 4 - rs->index;
1672             if (l > size) {
1673                 l = size;
1674             }
1675             memcpy(rs->buf + rs->index, buf, l);
1676             buf += l;
1677             size -= l;
1678             rs->index += l;
1679             if (rs->index == 4) {
1680                 /* got vnet header length */
1681                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1682                 rs->index = 0;
1683                 rs->state = 2;
1684             }
1685             break;
1686         case 2:
1687             l = rs->packet_len - rs->index;
1688             if (l > size) {
1689                 l = size;
1690             }
1691             if (rs->index + l <= sizeof(rs->buf)) {
1692                 memcpy(rs->buf + rs->index, buf, l);
1693             } else {
1694                 fprintf(stderr, "serious error: oversized packet received,"
1695                     "connection terminated.\n");
1696                 rs->index = rs->state = 0;
1697                 return -1;
1698             }
1699
1700             rs->index += l;
1701             buf += l;
1702             size -= l;
1703             if (rs->index >= rs->packet_len) {
1704                 rs->index = 0;
1705                 rs->state = 0;
1706                 assert(rs->finalize);
1707                 rs->finalize(rs);
1708             }
1709             break;
1710         }
1711     }
1712
1713     assert(size == 0);
1714     return 0;
1715 }