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/runstate.h"
  54 #include "sysemu/sysemu.h"
  55 #include "net/filter.h"
  56 #include "qapi/string-output-visitor.h"
  57
  58 /* Net bridge is currently not supported for W32. */
  59 #if !defined(_WIN32)
  60 # define CONFIG_NET_BRIDGE
  61 #endif
  62
  63 static VMChangeStateEntry *net_change_state_entry;
  64 static QTAILQ_HEAD(, NetClientState) net_clients;
  65
  66 /***********************************************************/
  67 /* network device redirectors */
  68
  69 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  70                     Error **errp)
  71 {
  72     gchar **substrings;
  73     struct hostent *he;
  74     const char *addr, *p, *r;
  75     int port, ret = 0;
  76
  77     substrings = g_strsplit(str, ":", 2);
  78     if (!substrings || !substrings[0] || !substrings[1]) {
  79         error_setg(errp, "host address '%s' doesn't contain ':' "
  80                    "separating host from port", str);
  81         ret = -1;
  82         goto out;
  83     }
  84
  85     addr = substrings[0];
  86     p = substrings[1];
  87
  88     saddr->sin_family = AF_INET;
  89     if (addr[0] == '\0') {
  90         saddr->sin_addr.s_addr = 0;
  91     } else {
  92         if (qemu_isdigit(addr[0])) {
  93             if (!inet_aton(addr, &saddr->sin_addr)) {
  94                 error_setg(errp, "host address '%s' is not a valid "
  95                            "IPv4 address", addr);
  96                 ret = -1;
  97                 goto out;
  98             }
  99         } else {
 100             he = gethostbyname(addr);
 101             if (he == NULL) {
 102                 error_setg(errp, "can't resolve host address '%s'", addr);
 103                 ret = -1;
 104                 goto out;
 105             }
 106             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 107         }
 108     }
 109     port = strtol(p, (char **)&r, 0);
 110     if (r == p) {
 111         error_setg(errp, "port number '%s' is invalid", p);
 112         ret = -1;
 113         goto out;
 114     }
 115     saddr->sin_port = htons(port);
 116
 117 out:
 118     g_strfreev(substrings);
 119     return ret;
 120 }
 121
 122 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 123 {
 124     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 125                            macaddr[0], macaddr[1], macaddr[2],
 126                            macaddr[3], macaddr[4], macaddr[5]);
 127 }
 128
 129 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 130 {
 131     snprintf(nc->info_str, sizeof(nc->info_str),
 132              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 133              nc->model,
 134              macaddr[0], macaddr[1], macaddr[2],
 135              macaddr[3], macaddr[4], macaddr[5]);
 136 }
 137
 138 static int mac_table[256] = {0};
 139
 140 static void qemu_macaddr_set_used(MACAddr *macaddr)
 141 {
 142     int index;
 143
 144     for (index = 0x56; index < 0xFF; index++) {
 145         if (macaddr->a[5] == index) {
 146             mac_table[index]++;
 147         }
 148     }
 149 }
 150
 151 static void qemu_macaddr_set_free(MACAddr *macaddr)
 152 {
 153     int index;
 154     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 155
 156     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 157         return;
 158     }
 159     for (index = 0x56; index < 0xFF; index++) {
 160         if (macaddr->a[5] == index) {
 161             mac_table[index]--;
 162         }
 163     }
 164 }
 165
 166 static int qemu_macaddr_get_free(void)
 167 {
 168     int index;
 169
 170     for (index = 0x56; index < 0xFF; index++) {
 171         if (mac_table[index] == 0) {
 172             return index;
 173         }
 174     }
 175
 176     return -1;
 177 }
 178
 179 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 180 {
 181     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 182     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 183
 184     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 185         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 186             return;
 187         } else {
 188             qemu_macaddr_set_used(macaddr);
 189             return;
 190         }
 191     }
 192
 193     macaddr->a[0] = 0x52;
 194     macaddr->a[1] = 0x54;
 195     macaddr->a[2] = 0x00;
 196     macaddr->a[3] = 0x12;
 197     macaddr->a[4] = 0x34;
 198     macaddr->a[5] = qemu_macaddr_get_free();
 199     qemu_macaddr_set_used(macaddr);
 200 }
 201
 202 /**
 203  * Generate a name for net client
 204  *
 205  * Only net clients created with the legacy -net option and NICs need this.
 206  */
 207 static char *assign_name(NetClientState *nc1, const char *model)
 208 {
 209     NetClientState *nc;
 210     int id = 0;
 211
 212     QTAILQ_FOREACH(nc, &net_clients, next) {
 213         if (nc == nc1) {
 214             continue;
 215         }
 216         if (strcmp(nc->model, model) == 0) {
 217             id++;
 218         }
 219     }
 220
 221     return g_strdup_printf("%s.%d", model, id);
 222 }
 223
 224 static void qemu_net_client_destructor(NetClientState *nc)
 225 {
 226     g_free(nc);
 227 }
 228 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 229                                        unsigned flags,
 230                                        const struct iovec *iov,
 231                                        int iovcnt,
 232                                        void *opaque);
 233
 234 static void qemu_net_client_setup(NetClientState *nc,
 235                                   NetClientInfo *info,
 236                                   NetClientState *peer,
 237                                   const char *model,
 238                                   const char *name,
 239                                   NetClientDestructor *destructor)
 240 {
 241     nc->info = info;
 242     nc->model = g_strdup(model);
 243     if (name) {
 244         nc->name = g_strdup(name);
 245     } else {
 246         nc->name = assign_name(nc, model);
 247     }
 248
 249     if (peer) {
 250         assert(!peer->peer);
 251         nc->peer = peer;
 252         peer->peer = nc;
 253     }
 254     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 255
 256     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 257     nc->destructor = destructor;
 258     QTAILQ_INIT(&nc->filters);
 259 }
 260
 261 NetClientState *qemu_new_net_client(NetClientInfo *info,
 262                                     NetClientState *peer,
 263                                     const char *model,
 264                                     const char *name)
 265 {
 266     NetClientState *nc;
 267
 268     assert(info->size >= sizeof(NetClientState));
 269
 270     nc = g_malloc0(info->size);
 271     qemu_net_client_setup(nc, info, peer, model, name,
 272                           qemu_net_client_destructor);
 273
 274     return nc;
 275 }
 276
 277 NICState *qemu_new_nic(NetClientInfo *info,
 278                        NICConf *conf,
 279                        const char *model,
 280                        const char *name,
 281                        void *opaque)
 282 {
 283     NetClientState **peers = conf->peers.ncs;
 284     NICState *nic;
 285     int i, queues = MAX(1, conf->peers.queues);
 286
 287     assert(info->type == NET_CLIENT_DRIVER_NIC);
 288     assert(info->size >= sizeof(NICState));
 289
 290     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 291     nic->ncs = (void *)nic + info->size;
 292     nic->conf = conf;
 293     nic->opaque = opaque;
 294
 295     for (i = 0; i < queues; i++) {
 296         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 297                               NULL);
 298         nic->ncs[i].queue_index = i;
 299     }
 300
 301     return nic;
 302 }
 303
 304 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 305 {
 306     return nic->ncs + queue_index;
 307 }
 308
 309 NetClientState *qemu_get_queue(NICState *nic)
 310 {
 311     return qemu_get_subqueue(nic, 0);
 312 }
 313
 314 NICState *qemu_get_nic(NetClientState *nc)
 315 {
 316     NetClientState *nc0 = nc - nc->queue_index;
 317
 318     return (NICState *)((void *)nc0 - nc->info->size);
 319 }
 320
 321 void *qemu_get_nic_opaque(NetClientState *nc)
 322 {
 323     NICState *nic = qemu_get_nic(nc);
 324
 325     return nic->opaque;
 326 }
 327
 328 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
 329 {
 330     assert(nc != NULL);
 331     NetClientState *ncs = nc + queue_index;
 332     return ncs->peer;
 333 }
 334
 335 static void qemu_cleanup_net_client(NetClientState *nc)
 336 {
 337     QTAILQ_REMOVE(&net_clients, nc, next);
 338
 339     if (nc->info->cleanup) {
 340         nc->info->cleanup(nc);
 341     }
 342 }
 343
 344 static void qemu_free_net_client(NetClientState *nc)
 345 {
 346     if (nc->incoming_queue) {
 347         qemu_del_net_queue(nc->incoming_queue);
 348     }
 349     if (nc->peer) {
 350         nc->peer->peer = NULL;
 351     }
 352     g_free(nc->name);
 353     g_free(nc->model);
 354     if (nc->destructor) {
 355         nc->destructor(nc);
 356     }
 357 }
 358
 359 void qemu_del_net_client(NetClientState *nc)
 360 {
 361     NetClientState *ncs[MAX_QUEUE_NUM];
 362     int queues, i;
 363     NetFilterState *nf, *next;
 364
 365     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 366
 367     /* If the NetClientState belongs to a multiqueue backend, we will change all
 368      * other NetClientStates also.
 369      */
 370     queues = qemu_find_net_clients_except(nc->name, ncs,
 371                                           NET_CLIENT_DRIVER_NIC,
 372                                           MAX_QUEUE_NUM);
 373     assert(queues != 0);
 374
 375     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 376         object_unparent(OBJECT(nf));
 377     }
 378
 379     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 380     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 381         NICState *nic = qemu_get_nic(nc->peer);
 382         if (nic->peer_deleted) {
 383             return;
 384         }
 385         nic->peer_deleted = true;
 386
 387         for (i = 0; i < queues; i++) {
 388             ncs[i]->peer->link_down = true;
 389         }
 390
 391         if (nc->peer->info->link_status_changed) {
 392             nc->peer->info->link_status_changed(nc->peer);
 393         }
 394
 395         for (i = 0; i < queues; i++) {
 396             qemu_cleanup_net_client(ncs[i]);
 397         }
 398
 399         return;
 400     }
 401
 402     for (i = 0; i < queues; i++) {
 403         qemu_cleanup_net_client(ncs[i]);
 404         qemu_free_net_client(ncs[i]);
 405     }
 406 }
 407
 408 void qemu_del_nic(NICState *nic)
 409 {
 410     int i, queues = MAX(nic->conf->peers.queues, 1);
 411
 412     qemu_macaddr_set_free(&nic->conf->macaddr);
 413
 414     for (i = 0; i < queues; i++) {
 415         NetClientState *nc = qemu_get_subqueue(nic, i);
 416         /* If this is a peer NIC and peer has already been deleted, free it now. */
 417         if (nic->peer_deleted) {
 418             qemu_free_net_client(nc->peer);
 419         } else if (nc->peer) {
 420             /* if there are RX packets pending, complete them */
 421             qemu_purge_queued_packets(nc->peer);
 422         }
 423     }
 424
 425     for (i = queues - 1; i >= 0; i--) {
 426         NetClientState *nc = qemu_get_subqueue(nic, i);
 427
 428         qemu_cleanup_net_client(nc);
 429         qemu_free_net_client(nc);
 430     }
 431
 432     g_free(nic);
 433 }
 434
 435 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 436 {
 437     NetClientState *nc;
 438
 439     QTAILQ_FOREACH(nc, &net_clients, next) {
 440         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 441             if (nc->queue_index == 0) {
 442                 func(qemu_get_nic(nc), opaque);
 443             }
 444         }
 445     }
 446 }
 447
 448 bool qemu_has_ufo(NetClientState *nc)
 449 {
 450     if (!nc || !nc->info->has_ufo) {
 451         return false;
 452     }
 453
 454     return nc->info->has_ufo(nc);
 455 }
 456
 457 bool qemu_has_vnet_hdr(NetClientState *nc)
 458 {
 459     if (!nc || !nc->info->has_vnet_hdr) {
 460         return false;
 461     }
 462
 463     return nc->info->has_vnet_hdr(nc);
 464 }
 465
 466 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 467 {
 468     if (!nc || !nc->info->has_vnet_hdr_len) {
 469         return false;
 470     }
 471
 472     return nc->info->has_vnet_hdr_len(nc, len);
 473 }
 474
 475 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 476 {
 477     if (!nc || !nc->info->using_vnet_hdr) {
 478         return;
 479     }
 480
 481     nc->info->using_vnet_hdr(nc, enable);
 482 }
 483
 484 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 485                           int ecn, int ufo)
 486 {
 487     if (!nc || !nc->info->set_offload) {
 488         return;
 489     }
 490
 491     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 492 }
 493
 494 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 495 {
 496     if (!nc || !nc->info->set_vnet_hdr_len) {
 497         return;
 498     }
 499
 500     nc->vnet_hdr_len = len;
 501     nc->info->set_vnet_hdr_len(nc, len);
 502 }
 503
 504 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 505 {
 506 #ifdef HOST_WORDS_BIGENDIAN
 507     if (!nc || !nc->info->set_vnet_le) {
 508         return -ENOSYS;
 509     }
 510
 511     return nc->info->set_vnet_le(nc, is_le);
 512 #else
 513     return 0;
 514 #endif
 515 }
 516
 517 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 518 {
 519 #ifdef HOST_WORDS_BIGENDIAN
 520     return 0;
 521 #else
 522     if (!nc || !nc->info->set_vnet_be) {
 523         return -ENOSYS;
 524     }
 525
 526     return nc->info->set_vnet_be(nc, is_be);
 527 #endif
 528 }
 529
 530 int qemu_can_send_packet(NetClientState *sender)
 531 {
 532     int vm_running = runstate_is_running();
 533
 534     if (!vm_running) {
 535         return 0;
 536     }
 537
 538     if (!sender->peer) {
 539         return 1;
 540     }
 541
 542     if (sender->peer->receive_disabled) {
 543         return 0;
 544     } else if (sender->peer->info->can_receive &&
 545                !sender->peer->info->can_receive(sender->peer)) {
 546         return 0;
 547     }
 548     return 1;
 549 }
 550
 551 static ssize_t filter_receive_iov(NetClientState *nc,
 552                                   NetFilterDirection direction,
 553                                   NetClientState *sender,
 554                                   unsigned flags,
 555                                   const struct iovec *iov,
 556                                   int iovcnt,
 557                                   NetPacketSent *sent_cb)
 558 {
 559     ssize_t ret = 0;
 560     NetFilterState *nf = NULL;
 561
 562     if (direction == NET_FILTER_DIRECTION_TX) {
 563         QTAILQ_FOREACH(nf, &nc->filters, next) {
 564             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 565                                          iovcnt, sent_cb);
 566             if (ret) {
 567                 return ret;
 568             }
 569         }
 570     } else {
 571         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 572             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 573                                          iovcnt, sent_cb);
 574             if (ret) {
 575                 return ret;
 576             }
 577         }
 578     }
 579
 580     return ret;
 581 }
 582
 583 static ssize_t filter_receive(NetClientState *nc,
 584                               NetFilterDirection direction,
 585                               NetClientState *sender,
 586                               unsigned flags,
 587                               const uint8_t *data,
 588                               size_t size,
 589                               NetPacketSent *sent_cb)
 590 {
 591     struct iovec iov = {
 592         .iov_base = (void *)data,
 593         .iov_len = size
 594     };
 595
 596     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 597 }
 598
 599 void qemu_purge_queued_packets(NetClientState *nc)
 600 {
 601     if (!nc->peer) {
 602         return;
 603     }
 604
 605     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 606 }
 607
 608 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 609 {
 610     nc->receive_disabled = 0;
 611
 612     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 613         if (net_hub_flush(nc->peer)) {
 614             qemu_notify_event();
 615         }
 616     }
 617     if (qemu_net_queue_flush(nc->incoming_queue)) {
 618         /* We emptied the queue successfully, signal to the IO thread to repoll
 619          * the file descriptor (for tap, for example).
 620          */
 621         qemu_notify_event();
 622     } else if (purge) {
 623         /* Unable to empty the queue, purge remaining packets */
 624         qemu_net_queue_purge(nc->incoming_queue, nc->peer);
 625     }
 626 }
 627
 628 void qemu_flush_queued_packets(NetClientState *nc)
 629 {
 630     qemu_flush_or_purge_queued_packets(nc, false);
 631 }
 632
 633 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 634                                                  unsigned flags,
 635                                                  const uint8_t *buf, int size,
 636                                                  NetPacketSent *sent_cb)
 637 {
 638     NetQueue *queue;
 639     int ret;
 640
 641 #ifdef DEBUG_NET
 642     printf("qemu_send_packet_async:\n");
 643     qemu_hexdump(stdout, "net", buf, size);
 644 #endif
 645
 646     if (sender->link_down || !sender->peer) {
 647         return size;
 648     }
 649
 650     /* Let filters handle the packet first */
 651     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 652                          sender, flags, buf, size, sent_cb);
 653     if (ret) {
 654         return ret;
 655     }
 656
 657     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 658                          sender, flags, buf, size, sent_cb);
 659     if (ret) {
 660         return ret;
 661     }
 662
 663     queue = sender->peer->incoming_queue;
 664
 665     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 666 }
 667
 668 ssize_t qemu_send_packet_async(NetClientState *sender,
 669                                const uint8_t *buf, int size,
 670                                NetPacketSent *sent_cb)
 671 {
 672     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 673                                              buf, size, sent_cb);
 674 }
 675
 676 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 677 {
 678     return qemu_send_packet_async(nc, buf, size, NULL);
 679 }
 680
 681 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 682 {
 683     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 684                                              buf, size, NULL);
 685 }
 686
 687 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 688                                int iovcnt, unsigned flags)
 689 {
 690     uint8_t *buf = NULL;
 691     uint8_t *buffer;
 692     size_t offset;
 693     ssize_t ret;
 694
 695     if (iovcnt == 1) {
 696         buffer = iov[0].iov_base;
 697         offset = iov[0].iov_len;
 698     } else {
 699         offset = iov_size(iov, iovcnt);
 700         if (offset > NET_BUFSIZE) {
 701             return -1;
 702         }
 703         buf = g_malloc(offset);
 704         buffer = buf;
 705         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 706     }
 707
 708     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 709         ret = nc->info->receive_raw(nc, buffer, offset);
 710     } else {
 711         ret = nc->info->receive(nc, buffer, offset);
 712     }
 713
 714     g_free(buf);
 715     return ret;
 716 }
 717
 718 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 719                                        unsigned flags,
 720                                        const struct iovec *iov,
 721                                        int iovcnt,
 722                                        void *opaque)
 723 {
 724     NetClientState *nc = opaque;
 725     int ret;
 726
 727
 728     if (nc->link_down) {
 729         return iov_size(iov, iovcnt);
 730     }
 731
 732     if (nc->receive_disabled) {
 733         return 0;
 734     }
 735
 736     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 737         ret = nc->info->receive_iov(nc, iov, iovcnt);
 738     } else {
 739         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 740     }
 741
 742     if (ret == 0) {
 743         nc->receive_disabled = 1;
 744     }
 745
 746     return ret;
 747 }
 748
 749 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 750                                 const struct iovec *iov, int iovcnt,
 751                                 NetPacketSent *sent_cb)
 752 {
 753     NetQueue *queue;
 754     size_t size = iov_size(iov, iovcnt);
 755     int ret;
 756
 757     if (size > NET_BUFSIZE) {
 758         return size;
 759     }
 760
 761     if (sender->link_down || !sender->peer) {
 762         return size;
 763     }
 764
 765     /* Let filters handle the packet first */
 766     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 767                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 768     if (ret) {
 769         return ret;
 770     }
 771
 772     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 773                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 774     if (ret) {
 775         return ret;
 776     }
 777
 778     queue = sender->peer->incoming_queue;
 779
 780     return qemu_net_queue_send_iov(queue, sender,
 781                                    QEMU_NET_PACKET_FLAG_NONE,
 782                                    iov, iovcnt, sent_cb);
 783 }
 784
 785 ssize_t
 786 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 787 {
 788     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 789 }
 790
 791 NetClientState *qemu_find_netdev(const char *id)
 792 {
 793     NetClientState *nc;
 794
 795     QTAILQ_FOREACH(nc, &net_clients, next) {
 796         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 797             continue;
 798         if (!strcmp(nc->name, id)) {
 799             return nc;
 800         }
 801     }
 802
 803     return NULL;
 804 }
 805
 806 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 807                                  NetClientDriver type, int max)
 808 {
 809     NetClientState *nc;
 810     int ret = 0;
 811
 812     QTAILQ_FOREACH(nc, &net_clients, next) {
 813         if (nc->info->type == type) {
 814             continue;
 815         }
 816         if (!id || !strcmp(nc->name, id)) {
 817             if (ret < max) {
 818                 ncs[ret] = nc;
 819             }
 820             ret++;
 821         }
 822     }
 823
 824     return ret;
 825 }
 826
 827 static int nic_get_free_idx(void)
 828 {
 829     int index;
 830
 831     for (index = 0; index < MAX_NICS; index++)
 832         if (!nd_table[index].used)
 833             return index;
 834     return -1;
 835 }
 836
 837 int qemu_show_nic_models(const char *arg, const char *const *models)
 838 {
 839     int i;
 840
 841     if (!arg || !is_help_option(arg)) {
 842         return 0;
 843     }
 844
 845     printf("Supported NIC models:\n");
 846     for (i = 0 ; models[i]; i++) {
 847         printf("%s\n", models[i]);
 848     }
 849     return 1;
 850 }
 851
 852 void qemu_check_nic_model(NICInfo *nd, const char *model)
 853 {
 854     const char *models[2];
 855
 856     models[0] = model;
 857     models[1] = NULL;
 858
 859     if (qemu_show_nic_models(nd->model, models))
 860         exit(0);
 861     if (qemu_find_nic_model(nd, models, model) < 0)
 862         exit(1);
 863 }
 864
 865 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 866                         const char *default_model)
 867 {
 868     int i;
 869
 870     if (!nd->model)
 871         nd->model = g_strdup(default_model);
 872
 873     for (i = 0 ; models[i]; i++) {
 874         if (strcmp(nd->model, models[i]) == 0)
 875             return i;
 876     }
 877
 878     error_report("Unsupported NIC model: %s", nd->model);
 879     return -1;
 880 }
 881
 882 static int net_init_nic(const Netdev *netdev, const char *name,
 883                         NetClientState *peer, Error **errp)
 884 {
 885     int idx;
 886     NICInfo *nd;
 887     const NetLegacyNicOptions *nic;
 888
 889     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 890     nic = &netdev->u.nic;
 891
 892     idx = nic_get_free_idx();
 893     if (idx == -1 || nb_nics >= MAX_NICS) {
 894         error_setg(errp, "too many NICs");
 895         return -1;
 896     }
 897
 898     nd = &nd_table[idx];
 899
 900     memset(nd, 0, sizeof(*nd));
 901
 902     if (nic->has_netdev) {
 903         nd->netdev = qemu_find_netdev(nic->netdev);
 904         if (!nd->netdev) {
 905             error_setg(errp, "netdev '%s' not found", nic->netdev);
 906             return -1;
 907         }
 908     } else {
 909         assert(peer);
 910         nd->netdev = peer;
 911     }
 912     nd->name = g_strdup(name);
 913     if (nic->has_model) {
 914         nd->model = g_strdup(nic->model);
 915     }
 916     if (nic->has_addr) {
 917         nd->devaddr = g_strdup(nic->addr);
 918     }
 919
 920     if (nic->has_macaddr &&
 921         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 922         error_setg(errp, "invalid syntax for ethernet address");
 923         return -1;
 924     }
 925     if (nic->has_macaddr &&
 926         is_multicast_ether_addr(nd->macaddr.a)) {
 927         error_setg(errp,
 928                    "NIC cannot have multicast MAC address (odd 1st byte)");
 929         return -1;
 930     }
 931     qemu_macaddr_default_if_unset(&nd->macaddr);
 932
 933     if (nic->has_vectors) {
 934         if (nic->vectors > 0x7ffffff) {
 935             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 936             return -1;
 937         }
 938         nd->nvectors = nic->vectors;
 939     } else {
 940         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 941     }
 942
 943     nd->used = 1;
 944     nb_nics++;
 945
 946     return idx;
 947 }
 948
 949
 950 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 951     const Netdev *netdev,
 952     const char *name,
 953     NetClientState *peer, Error **errp) = {
 954         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 955 #ifdef CONFIG_SLIRP
 956         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 957 #endif
 958         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 959         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 960 #ifdef CONFIG_VDE
 961         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 962 #endif
 963 #ifdef CONFIG_NETMAP
 964         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 965 #endif
 966 #ifdef CONFIG_NET_BRIDGE
 967         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 968 #endif
 969         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 970 #ifdef CONFIG_VHOST_NET_USER
 971         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 972 #endif
 973 #ifdef CONFIG_VHOST_NET_VDPA
 974         [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
 975 #endif
 976 #ifdef CONFIG_L2TPV3
 977         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 978 #endif
 979 };
 980
 981
 982 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
 983 {
 984     NetClientState *peer = NULL;
 985     NetClientState *nc;
 986
 987     if (is_netdev) {
 988         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 989             !net_client_init_fun[netdev->type]) {
 990             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 991                        "a netdev backend type");
 992             return -1;
 993         }
 994     } else {
 995         if (netdev->type == NET_CLIENT_DRIVER_NONE) {
 996             return 0; /* nothing to do */
 997         }
 998         if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
 999             !net_client_init_fun[netdev->type]) {
1000             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1001                        "a net backend type (maybe it is not compiled "
1002                        "into this binary)");
1003             return -1;
1004         }
1005
1006         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1007         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1008             !netdev->u.nic.has_netdev) {
1009             peer = net_hub_add_port(0, NULL, NULL);
1010         }
1011     }
1012
1013     nc = qemu_find_netdev(netdev->id);
1014     if (nc) {
1015         error_setg(errp, "Duplicate ID '%s'", netdev->id);
1016         return -1;
1017     }
1018
1019     if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1020         /* FIXME drop when all init functions store an Error */
1021         if (errp && !*errp) {
1022             error_setg(errp, "Device '%s' could not be initialized",
1023                        NetClientDriver_str(netdev->type));
1024         }
1025         return -1;
1026     }
1027
1028     if (is_netdev) {
1029         nc = qemu_find_netdev(netdev->id);
1030         assert(nc);
1031         nc->is_netdev = true;
1032     }
1033
1034     return 0;
1035 }
1036
1037 void show_netdevs(void)
1038 {
1039     int idx;
1040     const char *available_netdevs[] = {
1041         "socket",
1042         "hubport",
1043         "tap",
1044 #ifdef CONFIG_SLIRP
1045         "user",
1046 #endif
1047 #ifdef CONFIG_L2TPV3
1048         "l2tpv3",
1049 #endif
1050 #ifdef CONFIG_VDE
1051         "vde",
1052 #endif
1053 #ifdef CONFIG_NET_BRIDGE
1054         "bridge",
1055 #endif
1056 #ifdef CONFIG_NETMAP
1057         "netmap",
1058 #endif
1059 #ifdef CONFIG_POSIX
1060         "vhost-user",
1061 #endif
1062 #ifdef CONFIG_VHOST_VDPA
1063         "vhost-vdpa",
1064 #endif
1065     };
1066
1067     qemu_printf("Available netdev backend types:\n");
1068     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1069         qemu_printf("%s\n", available_netdevs[idx]);
1070     }
1071 }
1072
1073 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1074 {
1075     gchar **substrings = NULL;
1076     Netdev *object = NULL;
1077     int ret = -1;
1078     Visitor *v = opts_visitor_new(opts);
1079
1080     /* Parse convenience option format ip6-net=fec0::0[/64] */
1081     const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1082
1083     if (ip6_net) {
1084         char *prefix_addr;
1085         unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1086
1087         substrings = g_strsplit(ip6_net, "/", 2);
1088         if (!substrings || !substrings[0]) {
1089             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1090                        "a valid IPv6 prefix");
1091             goto out;
1092         }
1093
1094         prefix_addr = substrings[0];
1095
1096         /* Handle user-specified prefix length. */
1097         if (substrings[1] &&
1098             qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1099         {
1100             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1101                        "ipv6-prefixlen", "a number");
1102             goto out;
1103         }
1104
1105         qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1106         qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1107                             &error_abort);
1108         qemu_opt_unset(opts, "ipv6-net");
1109     }
1110
1111     /* Create an ID for -net if the user did not specify one */
1112     if (!is_netdev && !qemu_opts_id(opts)) {
1113         static int idx;
1114         qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++));
1115     }
1116
1117     if (visit_type_Netdev(v, NULL, &object, errp)) {
1118         ret = net_client_init1(object, is_netdev, errp);
1119     }
1120
1121     qapi_free_Netdev(object);
1122
1123 out:
1124     g_strfreev(substrings);
1125     visit_free(v);
1126     return ret;
1127 }
1128
1129 void netdev_add(QemuOpts *opts, Error **errp)
1130 {
1131     net_client_init(opts, true, errp);
1132 }
1133
1134 void qmp_netdev_add(Netdev *netdev, Error **errp)
1135 {
1136     net_client_init1(netdev, true, errp);
1137 }
1138
1139 void qmp_netdev_del(const char *id, Error **errp)
1140 {
1141     NetClientState *nc;
1142     QemuOpts *opts;
1143
1144     nc = qemu_find_netdev(id);
1145     if (!nc) {
1146         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1147                   "Device '%s' not found", id);
1148         return;
1149     }
1150
1151     if (!nc->is_netdev) {
1152         error_setg(errp, "Device '%s' is not a netdev", id);
1153         return;
1154     }
1155
1156     qemu_del_net_client(nc);
1157
1158     /*
1159      * Wart: we need to delete the QemuOpts associated with netdevs
1160      * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in
1161      * HMP netdev_add.
1162      */
1163     opts = qemu_opts_find(qemu_find_opts("netdev"), id);
1164     if (opts) {
1165         qemu_opts_del(opts);
1166     }
1167 }
1168
1169 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1170 {
1171     char *str;
1172     ObjectProperty *prop;
1173     ObjectPropertyIterator iter;
1174     Visitor *v;
1175
1176     /* generate info str */
1177     object_property_iter_init(&iter, OBJECT(nf));
1178     while ((prop = object_property_iter_next(&iter))) {
1179         if (!strcmp(prop->name, "type")) {
1180             continue;
1181         }
1182         v = string_output_visitor_new(false, &str);
1183         object_property_get(OBJECT(nf), prop->name, v, NULL);
1184         visit_complete(v, &str);
1185         visit_free(v);
1186         monitor_printf(mon, ",%s=%s", prop->name, str);
1187         g_free(str);
1188     }
1189     monitor_printf(mon, "\n");
1190 }
1191
1192 void print_net_client(Monitor *mon, NetClientState *nc)
1193 {
1194     NetFilterState *nf;
1195
1196     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1197                    nc->queue_index,
1198                    NetClientDriver_str(nc->info->type),
1199                    nc->info_str);
1200     if (!QTAILQ_EMPTY(&nc->filters)) {
1201         monitor_printf(mon, "filters:\n");
1202     }
1203     QTAILQ_FOREACH(nf, &nc->filters, next) {
1204         monitor_printf(mon, "  - %s: type=%s",
1205                        object_get_canonical_path_component(OBJECT(nf)),
1206                        object_get_typename(OBJECT(nf)));
1207         netfilter_print_info(mon, nf);
1208     }
1209 }
1210
1211 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1212                                       Error **errp)
1213 {
1214     NetClientState *nc;
1215     RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
1216
1217     QTAILQ_FOREACH(nc, &net_clients, next) {
1218         RxFilterInfo *info;
1219
1220         if (has_name && strcmp(nc->name, name) != 0) {
1221             continue;
1222         }
1223
1224         /* only query rx-filter information of NIC */
1225         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1226             if (has_name) {
1227                 error_setg(errp, "net client(%s) isn't a NIC", name);
1228                 assert(!filter_list);
1229                 return NULL;
1230             }
1231             continue;
1232         }
1233
1234         /* only query information on queue 0 since the info is per nic,
1235          * not per queue
1236          */
1237         if (nc->queue_index != 0)
1238             continue;
1239
1240         if (nc->info->query_rx_filter) {
1241             info = nc->info->query_rx_filter(nc);
1242             QAPI_LIST_APPEND(tail, info);
1243         } else if (has_name) {
1244             error_setg(errp, "net client(%s) doesn't support"
1245                        " rx-filter querying", name);
1246             assert(!filter_list);
1247             return NULL;
1248         }
1249
1250         if (has_name) {
1251             break;
1252         }
1253     }
1254
1255     if (filter_list == NULL && has_name) {
1256         error_setg(errp, "invalid net client name: %s", name);
1257     }
1258
1259     return filter_list;
1260 }
1261
1262 void hmp_info_network(Monitor *mon, const QDict *qdict)
1263 {
1264     NetClientState *nc, *peer;
1265     NetClientDriver type;
1266
1267     net_hub_info(mon);
1268
1269     QTAILQ_FOREACH(nc, &net_clients, next) {
1270         peer = nc->peer;
1271         type = nc->info->type;
1272
1273         /* Skip if already printed in hub info */
1274         if (net_hub_id_for_client(nc, NULL) == 0) {
1275             continue;
1276         }
1277
1278         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1279             print_net_client(mon, nc);
1280         } /* else it's a netdev connected to a NIC, printed with the NIC */
1281         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1282             monitor_printf(mon, " \\ ");
1283             print_net_client(mon, peer);
1284         }
1285     }
1286 }
1287
1288 void colo_notify_filters_event(int event, Error **errp)
1289 {
1290     NetClientState *nc;
1291     NetFilterState *nf;
1292     NetFilterClass *nfc = NULL;
1293     Error *local_err = NULL;
1294
1295     QTAILQ_FOREACH(nc, &net_clients, next) {
1296         QTAILQ_FOREACH(nf, &nc->filters, next) {
1297             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1298             nfc->handle_event(nf, event, &local_err);
1299             if (local_err) {
1300                 error_propagate(errp, local_err);
1301                 return;
1302             }
1303         }
1304     }
1305 }
1306
1307 void qmp_set_link(const char *name, bool up, Error **errp)
1308 {
1309     NetClientState *ncs[MAX_QUEUE_NUM];
1310     NetClientState *nc;
1311     int queues, i;
1312
1313     queues = qemu_find_net_clients_except(name, ncs,
1314                                           NET_CLIENT_DRIVER__MAX,
1315                                           MAX_QUEUE_NUM);
1316
1317     if (queues == 0) {
1318         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1319                   "Device '%s' not found", name);
1320         return;
1321     }
1322     nc = ncs[0];
1323
1324     for (i = 0; i < queues; i++) {
1325         ncs[i]->link_down = !up;
1326     }
1327
1328     if (nc->info->link_status_changed) {
1329         nc->info->link_status_changed(nc);
1330     }
1331
1332     if (nc->peer) {
1333         /* Change peer link only if the peer is NIC and then notify peer.
1334          * If the peer is a HUBPORT or a backend, we do not change the
1335          * link status.
1336          *
1337          * This behavior is compatible with qemu hubs where there could be
1338          * multiple clients that can still communicate with each other in
1339          * disconnected mode. For now maintain this compatibility.
1340          */
1341         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1342             for (i = 0; i < queues; i++) {
1343                 ncs[i]->peer->link_down = !up;
1344             }
1345         }
1346         if (nc->peer->info->link_status_changed) {
1347             nc->peer->info->link_status_changed(nc->peer);
1348         }
1349     }
1350 }
1351
1352 static void net_vm_change_state_handler(void *opaque, int running,
1353                                         RunState state)
1354 {
1355     NetClientState *nc;
1356     NetClientState *tmp;
1357
1358     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1359         if (running) {
1360             /* Flush queued packets and wake up backends. */
1361             if (nc->peer && qemu_can_send_packet(nc)) {
1362                 qemu_flush_queued_packets(nc->peer);
1363             }
1364         } else {
1365             /* Complete all queued packets, to guarantee we don't modify
1366              * state later when VM is not running.
1367              */
1368             qemu_flush_or_purge_queued_packets(nc, true);
1369         }
1370     }
1371 }
1372
1373 void net_cleanup(void)
1374 {
1375     NetClientState *nc;
1376
1377     /* We may del multiple entries during qemu_del_net_client(),
1378      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1379      */
1380     while (!QTAILQ_EMPTY(&net_clients)) {
1381         nc = QTAILQ_FIRST(&net_clients);
1382         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1383             qemu_del_nic(qemu_get_nic(nc));
1384         } else {
1385             qemu_del_net_client(nc);
1386         }
1387     }
1388
1389     qemu_del_vm_change_state_handler(net_change_state_entry);
1390 }
1391
1392 void net_check_clients(void)
1393 {
1394     NetClientState *nc;
1395     int i;
1396
1397     net_hub_check_clients();
1398
1399     QTAILQ_FOREACH(nc, &net_clients, next) {
1400         if (!nc->peer) {
1401             warn_report("%s %s has no peer",
1402                         nc->info->type == NET_CLIENT_DRIVER_NIC
1403                         ? "nic" : "netdev",
1404                         nc->name);
1405         }
1406     }
1407
1408     /* Check that all NICs requested via -net nic actually got created.
1409      * NICs created via -device don't need to be checked here because
1410      * they are always instantiated.
1411      */
1412     for (i = 0; i < MAX_NICS; i++) {
1413         NICInfo *nd = &nd_table[i];
1414         if (nd->used && !nd->instantiated) {
1415             warn_report("requested NIC (%s, model %s) "
1416                         "was not created (not supported by this machine?)",
1417                         nd->name ? nd->name : "anonymous",
1418                         nd->model ? nd->model : "unspecified");
1419         }
1420     }
1421 }
1422
1423 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1424 {
1425     return net_client_init(opts, false, errp);
1426 }
1427
1428 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1429 {
1430     const char *type = qemu_opt_get(opts, "type");
1431
1432     if (type && is_help_option(type)) {
1433         show_netdevs();
1434         exit(0);
1435     }
1436     return net_client_init(opts, true, errp);
1437 }
1438
1439 /* For the convenience "--nic" parameter */
1440 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1441 {
1442     char *mac, *nd_id;
1443     int idx, ret;
1444     NICInfo *ni;
1445     const char *type;
1446
1447     type = qemu_opt_get(opts, "type");
1448     if (type && g_str_equal(type, "none")) {
1449         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1450     }
1451
1452     idx = nic_get_free_idx();
1453     if (idx == -1 || nb_nics >= MAX_NICS) {
1454         error_setg(errp, "no more on-board/default NIC slots available");
1455         return -1;
1456     }
1457
1458     if (!type) {
1459         qemu_opt_set(opts, "type", "user", &error_abort);
1460     }
1461
1462     ni = &nd_table[idx];
1463     memset(ni, 0, sizeof(*ni));
1464     ni->model = qemu_opt_get_del(opts, "model");
1465
1466     /* Create an ID if the user did not specify one */
1467     nd_id = g_strdup(qemu_opts_id(opts));
1468     if (!nd_id) {
1469         nd_id = g_strdup_printf("__org.qemu.nic%i", idx);
1470         qemu_opts_set_id(opts, nd_id);
1471     }
1472
1473     /* Handle MAC address */
1474     mac = qemu_opt_get_del(opts, "mac");
1475     if (mac) {
1476         ret = net_parse_macaddr(ni->macaddr.a, mac);
1477         g_free(mac);
1478         if (ret) {
1479             error_setg(errp, "invalid syntax for ethernet address");
1480             goto out;
1481         }
1482         if (is_multicast_ether_addr(ni->macaddr.a)) {
1483             error_setg(errp, "NIC cannot have multicast MAC address");
1484             ret = -1;
1485             goto out;
1486         }
1487     }
1488     qemu_macaddr_default_if_unset(&ni->macaddr);
1489
1490     ret = net_client_init(opts, true, errp);
1491     if (ret == 0) {
1492         ni->netdev = qemu_find_netdev(nd_id);
1493         ni->used = true;
1494         nb_nics++;
1495     }
1496
1497 out:
1498     g_free(nd_id);
1499     return ret;
1500 }
1501
1502 int net_init_clients(Error **errp)
1503 {
1504     net_change_state_entry =
1505         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1506
1507     QTAILQ_INIT(&net_clients);
1508
1509     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1510                           net_init_netdev, NULL, errp)) {
1511         return -1;
1512     }
1513
1514     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1515         return -1;
1516     }
1517
1518     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1519         return -1;
1520     }
1521
1522     return 0;
1523 }
1524
1525 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1526 {
1527     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1528         return -1;
1529     }
1530
1531     return 0;
1532 }
1533
1534 /* From FreeBSD */
1535 /* XXX: optimize */
1536 uint32_t net_crc32(const uint8_t *p, int len)
1537 {
1538     uint32_t crc;
1539     int carry, i, j;
1540     uint8_t b;
1541
1542     crc = 0xffffffff;
1543     for (i = 0; i < len; i++) {
1544         b = *p++;
1545         for (j = 0; j < 8; j++) {
1546             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1547             crc <<= 1;
1548             b >>= 1;
1549             if (carry) {
1550                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1551             }
1552         }
1553     }
1554
1555     return crc;
1556 }
1557
1558 uint32_t net_crc32_le(const uint8_t *p, int len)
1559 {
1560     uint32_t crc;
1561     int carry, i, j;
1562     uint8_t b;
1563
1564     crc = 0xffffffff;
1565     for (i = 0; i < len; i++) {
1566         b = *p++;
1567         for (j = 0; j < 8; j++) {
1568             carry = (crc & 0x1) ^ (b & 0x01);
1569             crc >>= 1;
1570             b >>= 1;
1571             if (carry) {
1572                 crc ^= POLYNOMIAL_LE;
1573             }
1574         }
1575     }
1576
1577     return crc;
1578 }
1579
1580 QemuOptsList qemu_netdev_opts = {
1581     .name = "netdev",
1582     .implied_opt_name = "type",
1583     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1584     .desc = {
1585         /*
1586          * no elements => accept any params
1587          * validation will happen later
1588          */
1589         { /* end of list */ }
1590     },
1591 };
1592
1593 QemuOptsList qemu_nic_opts = {
1594     .name = "nic",
1595     .implied_opt_name = "type",
1596     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1597     .desc = {
1598         /*
1599          * no elements => accept any params
1600          * validation will happen later
1601          */
1602         { /* end of list */ }
1603     },
1604 };
1605
1606 QemuOptsList qemu_net_opts = {
1607     .name = "net",
1608     .implied_opt_name = "type",
1609     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1610     .desc = {
1611         /*
1612          * no elements => accept any params
1613          * validation will happen later
1614          */
1615         { /* end of list */ }
1616     },
1617 };
1618
1619 void net_socket_rs_init(SocketReadState *rs,
1620                         SocketReadStateFinalize *finalize,
1621                         bool vnet_hdr)
1622 {
1623     rs->state = 0;
1624     rs->vnet_hdr = vnet_hdr;
1625     rs->index = 0;
1626     rs->packet_len = 0;
1627     rs->vnet_hdr_len = 0;
1628     memset(rs->buf, 0, sizeof(rs->buf));
1629     rs->finalize = finalize;
1630 }
1631
1632 /*
1633  * Returns
1634  * 0: success
1635  * -1: error occurs
1636  */
1637 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1638 {
1639     unsigned int l;
1640
1641     while (size > 0) {
1642         /* Reassemble a packet from the network.
1643          * 0 = getting length.
1644          * 1 = getting vnet header length.
1645          * 2 = getting data.
1646          */
1647         switch (rs->state) {
1648         case 0:
1649             l = 4 - rs->index;
1650             if (l > size) {
1651                 l = size;
1652             }
1653             memcpy(rs->buf + rs->index, buf, l);
1654             buf += l;
1655             size -= l;
1656             rs->index += l;
1657             if (rs->index == 4) {
1658                 /* got length */
1659                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1660                 rs->index = 0;
1661                 if (rs->vnet_hdr) {
1662                     rs->state = 1;
1663                 } else {
1664                     rs->state = 2;
1665                     rs->vnet_hdr_len = 0;
1666                 }
1667             }
1668             break;
1669         case 1:
1670             l = 4 - rs->index;
1671             if (l > size) {
1672                 l = size;
1673             }
1674             memcpy(rs->buf + rs->index, buf, l);
1675             buf += l;
1676             size -= l;
1677             rs->index += l;
1678             if (rs->index == 4) {
1679                 /* got vnet header length */
1680                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1681                 rs->index = 0;
1682                 rs->state = 2;
1683             }
1684             break;
1685         case 2:
1686             l = rs->packet_len - rs->index;
1687             if (l > size) {
1688                 l = size;
1689             }
1690             if (rs->index + l <= sizeof(rs->buf)) {
1691                 memcpy(rs->buf + rs->index, buf, l);
1692             } else {
1693                 fprintf(stderr, "serious error: oversized packet received,"
1694                     "connection terminated.\n");
1695                 rs->index = rs->state = 0;
1696                 return -1;
1697             }
1698
1699             rs->index += l;
1700             buf += l;
1701             size -= l;
1702             if (rs->index >= rs->packet_len) {
1703                 rs->index = 0;
1704                 rs->state = 0;
1705                 assert(rs->finalize);
1706                 rs->finalize(rs);
1707             }
1708             break;
1709         }
1710     }
1711
1712     assert(size == 0);
1713     return 0;
1714 }