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 #include "qemu-common.h"
  27
  28 #include "net/net.h"
  29 #include "clients.h"
  30 #include "hub.h"
  31 #include "hw/qdev-properties.h"
  32 #include "net/slirp.h"
  33 #include "net/eth.h"
  34 #include "util.h"
  35
  36 #include "monitor/monitor.h"
  37 #include "qemu/help_option.h"
  38 #include "qapi/qapi-commands-net.h"
  39 #include "qapi/qapi-visit-net.h"
  40 #include "qapi/qmp/qdict.h"
  41 #include "qapi/qmp/qerror.h"
  42 #include "qemu/error-report.h"
  43 #include "qemu/sockets.h"
  44 #include "qemu/cutils.h"
  45 #include "qemu/config-file.h"
  46 #include "qemu/ctype.h"
  47 #include "qemu/id.h"
  48 #include "qemu/iov.h"
  49 #include "qemu/qemu-print.h"
  50 #include "qemu/main-loop.h"
  51 #include "qemu/option.h"
  52 #include "qapi/error.h"
  53 #include "qapi/opts-visitor.h"
  54 #include "sysemu/sysemu.h"
  55 #include "sysemu/runstate.h"
  56 #include "sysemu/sysemu.h"
  57 #include "net/filter.h"
  58 #include "qapi/string-output-visitor.h"
  59
  60 /* Net bridge is currently not supported for W32. */
  61 #if !defined(_WIN32)
  62 # define CONFIG_NET_BRIDGE
  63 #endif
  64
  65 static VMChangeStateEntry *net_change_state_entry;
  66 static QTAILQ_HEAD(, NetClientState) net_clients;
  67
  68 /***********************************************************/
  69 /* network device redirectors */
  70
  71 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  72                     Error **errp)
  73 {
  74     gchar **substrings;
  75     struct hostent *he;
  76     const char *addr, *p, *r;
  77     int port, ret = 0;
  78
  79     substrings = g_strsplit(str, ":", 2);
  80     if (!substrings || !substrings[0] || !substrings[1]) {
  81         error_setg(errp, "host address '%s' doesn't contain ':' "
  82                    "separating host from port", str);
  83         ret = -1;
  84         goto out;
  85     }
  86
  87     addr = substrings[0];
  88     p = substrings[1];
  89
  90     saddr->sin_family = AF_INET;
  91     if (addr[0] == '\0') {
  92         saddr->sin_addr.s_addr = 0;
  93     } else {
  94         if (qemu_isdigit(addr[0])) {
  95             if (!inet_aton(addr, &saddr->sin_addr)) {
  96                 error_setg(errp, "host address '%s' is not a valid "
  97                            "IPv4 address", addr);
  98                 ret = -1;
  99                 goto out;
 100             }
 101         } else {
 102             he = gethostbyname(addr);
 103             if (he == NULL) {
 104                 error_setg(errp, "can't resolve host address '%s'", addr);
 105                 ret = -1;
 106                 goto out;
 107             }
 108             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 109         }
 110     }
 111     port = strtol(p, (char **)&r, 0);
 112     if (r == p) {
 113         error_setg(errp, "port number '%s' is invalid", p);
 114         ret = -1;
 115         goto out;
 116     }
 117     saddr->sin_port = htons(port);
 118
 119 out:
 120     g_strfreev(substrings);
 121     return ret;
 122 }
 123
 124 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 125 {
 126     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 127                            macaddr[0], macaddr[1], macaddr[2],
 128                            macaddr[3], macaddr[4], macaddr[5]);
 129 }
 130
 131 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 132 {
 133     snprintf(nc->info_str, sizeof(nc->info_str),
 134              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 135              nc->model,
 136              macaddr[0], macaddr[1], macaddr[2],
 137              macaddr[3], macaddr[4], macaddr[5]);
 138 }
 139
 140 static int mac_table[256] = {0};
 141
 142 static void qemu_macaddr_set_used(MACAddr *macaddr)
 143 {
 144     int index;
 145
 146     for (index = 0x56; index < 0xFF; index++) {
 147         if (macaddr->a[5] == index) {
 148             mac_table[index]++;
 149         }
 150     }
 151 }
 152
 153 static void qemu_macaddr_set_free(MACAddr *macaddr)
 154 {
 155     int index;
 156     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 157
 158     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 159         return;
 160     }
 161     for (index = 0x56; index < 0xFF; index++) {
 162         if (macaddr->a[5] == index) {
 163             mac_table[index]--;
 164         }
 165     }
 166 }
 167
 168 static int qemu_macaddr_get_free(void)
 169 {
 170     int index;
 171
 172     for (index = 0x56; index < 0xFF; index++) {
 173         if (mac_table[index] == 0) {
 174             return index;
 175         }
 176     }
 177
 178     return -1;
 179 }
 180
 181 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 182 {
 183     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 184     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 185
 186     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 187         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 188             return;
 189         } else {
 190             qemu_macaddr_set_used(macaddr);
 191             return;
 192         }
 193     }
 194
 195     macaddr->a[0] = 0x52;
 196     macaddr->a[1] = 0x54;
 197     macaddr->a[2] = 0x00;
 198     macaddr->a[3] = 0x12;
 199     macaddr->a[4] = 0x34;
 200     macaddr->a[5] = qemu_macaddr_get_free();
 201     qemu_macaddr_set_used(macaddr);
 202 }
 203
 204 /**
 205  * Generate a name for net client
 206  *
 207  * Only net clients created with the legacy -net option and NICs need this.
 208  */
 209 static char *assign_name(NetClientState *nc1, const char *model)
 210 {
 211     NetClientState *nc;
 212     int id = 0;
 213
 214     QTAILQ_FOREACH(nc, &net_clients, next) {
 215         if (nc == nc1) {
 216             continue;
 217         }
 218         if (strcmp(nc->model, model) == 0) {
 219             id++;
 220         }
 221     }
 222
 223     return g_strdup_printf("%s.%d", model, id);
 224 }
 225
 226 static void qemu_net_client_destructor(NetClientState *nc)
 227 {
 228     g_free(nc);
 229 }
 230 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 231                                        unsigned flags,
 232                                        const struct iovec *iov,
 233                                        int iovcnt,
 234                                        void *opaque);
 235
 236 static void qemu_net_client_setup(NetClientState *nc,
 237                                   NetClientInfo *info,
 238                                   NetClientState *peer,
 239                                   const char *model,
 240                                   const char *name,
 241                                   NetClientDestructor *destructor)
 242 {
 243     nc->info = info;
 244     nc->model = g_strdup(model);
 245     if (name) {
 246         nc->name = g_strdup(name);
 247     } else {
 248         nc->name = assign_name(nc, model);
 249     }
 250
 251     if (peer) {
 252         assert(!peer->peer);
 253         nc->peer = peer;
 254         peer->peer = nc;
 255     }
 256     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 257
 258     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 259     nc->destructor = destructor;
 260     QTAILQ_INIT(&nc->filters);
 261 }
 262
 263 NetClientState *qemu_new_net_client(NetClientInfo *info,
 264                                     NetClientState *peer,
 265                                     const char *model,
 266                                     const char *name)
 267 {
 268     NetClientState *nc;
 269
 270     assert(info->size >= sizeof(NetClientState));
 271
 272     nc = g_malloc0(info->size);
 273     qemu_net_client_setup(nc, info, peer, model, name,
 274                           qemu_net_client_destructor);
 275
 276     return nc;
 277 }
 278
 279 NICState *qemu_new_nic(NetClientInfo *info,
 280                        NICConf *conf,
 281                        const char *model,
 282                        const char *name,
 283                        void *opaque)
 284 {
 285     NetClientState **peers = conf->peers.ncs;
 286     NICState *nic;
 287     int i, queues = MAX(1, conf->peers.queues);
 288
 289     assert(info->type == NET_CLIENT_DRIVER_NIC);
 290     assert(info->size >= sizeof(NICState));
 291
 292     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 293     nic->ncs = (void *)nic + info->size;
 294     nic->conf = conf;
 295     nic->opaque = opaque;
 296
 297     for (i = 0; i < queues; i++) {
 298         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 299                               NULL);
 300         nic->ncs[i].queue_index = i;
 301     }
 302
 303     return nic;
 304 }
 305
 306 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 307 {
 308     return nic->ncs + queue_index;
 309 }
 310
 311 NetClientState *qemu_get_queue(NICState *nic)
 312 {
 313     return qemu_get_subqueue(nic, 0);
 314 }
 315
 316 NICState *qemu_get_nic(NetClientState *nc)
 317 {
 318     NetClientState *nc0 = nc - nc->queue_index;
 319
 320     return (NICState *)((void *)nc0 - nc->info->size);
 321 }
 322
 323 void *qemu_get_nic_opaque(NetClientState *nc)
 324 {
 325     NICState *nic = qemu_get_nic(nc);
 326
 327     return nic->opaque;
 328 }
 329
 330 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
 331 {
 332     assert(nc != NULL);
 333     NetClientState *ncs = nc + queue_index;
 334     return ncs->peer;
 335 }
 336
 337 static void qemu_cleanup_net_client(NetClientState *nc)
 338 {
 339     QTAILQ_REMOVE(&net_clients, nc, next);
 340
 341     if (nc->info->cleanup) {
 342         nc->info->cleanup(nc);
 343     }
 344 }
 345
 346 static void qemu_free_net_client(NetClientState *nc)
 347 {
 348     if (nc->incoming_queue) {
 349         qemu_del_net_queue(nc->incoming_queue);
 350     }
 351     if (nc->peer) {
 352         nc->peer->peer = NULL;
 353     }
 354     g_free(nc->name);
 355     g_free(nc->model);
 356     if (nc->destructor) {
 357         nc->destructor(nc);
 358     }
 359 }
 360
 361 void qemu_del_net_client(NetClientState *nc)
 362 {
 363     NetClientState *ncs[MAX_QUEUE_NUM];
 364     int queues, i;
 365     NetFilterState *nf, *next;
 366
 367     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 368
 369     /* If the NetClientState belongs to a multiqueue backend, we will change all
 370      * other NetClientStates also.
 371      */
 372     queues = qemu_find_net_clients_except(nc->name, ncs,
 373                                           NET_CLIENT_DRIVER_NIC,
 374                                           MAX_QUEUE_NUM);
 375     assert(queues != 0);
 376
 377     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 378         object_unparent(OBJECT(nf));
 379     }
 380
 381     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 382     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 383         NICState *nic = qemu_get_nic(nc->peer);
 384         if (nic->peer_deleted) {
 385             return;
 386         }
 387         nic->peer_deleted = true;
 388
 389         for (i = 0; i < queues; i++) {
 390             ncs[i]->peer->link_down = true;
 391         }
 392
 393         if (nc->peer->info->link_status_changed) {
 394             nc->peer->info->link_status_changed(nc->peer);
 395         }
 396
 397         for (i = 0; i < queues; i++) {
 398             qemu_cleanup_net_client(ncs[i]);
 399         }
 400
 401         return;
 402     }
 403
 404     for (i = 0; i < queues; i++) {
 405         qemu_cleanup_net_client(ncs[i]);
 406         qemu_free_net_client(ncs[i]);
 407     }
 408 }
 409
 410 void qemu_del_nic(NICState *nic)
 411 {
 412     int i, queues = MAX(nic->conf->peers.queues, 1);
 413
 414     qemu_macaddr_set_free(&nic->conf->macaddr);
 415
 416     for (i = 0; i < queues; i++) {
 417         NetClientState *nc = qemu_get_subqueue(nic, i);
 418         /* If this is a peer NIC and peer has already been deleted, free it now. */
 419         if (nic->peer_deleted) {
 420             qemu_free_net_client(nc->peer);
 421         } else if (nc->peer) {
 422             /* if there are RX packets pending, complete them */
 423             qemu_purge_queued_packets(nc->peer);
 424         }
 425     }
 426
 427     for (i = queues - 1; i >= 0; i--) {
 428         NetClientState *nc = qemu_get_subqueue(nic, i);
 429
 430         qemu_cleanup_net_client(nc);
 431         qemu_free_net_client(nc);
 432     }
 433
 434     g_free(nic);
 435 }
 436
 437 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 438 {
 439     NetClientState *nc;
 440
 441     QTAILQ_FOREACH(nc, &net_clients, next) {
 442         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 443             if (nc->queue_index == 0) {
 444                 func(qemu_get_nic(nc), opaque);
 445             }
 446         }
 447     }
 448 }
 449
 450 bool qemu_has_ufo(NetClientState *nc)
 451 {
 452     if (!nc || !nc->info->has_ufo) {
 453         return false;
 454     }
 455
 456     return nc->info->has_ufo(nc);
 457 }
 458
 459 bool qemu_has_vnet_hdr(NetClientState *nc)
 460 {
 461     if (!nc || !nc->info->has_vnet_hdr) {
 462         return false;
 463     }
 464
 465     return nc->info->has_vnet_hdr(nc);
 466 }
 467
 468 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 469 {
 470     if (!nc || !nc->info->has_vnet_hdr_len) {
 471         return false;
 472     }
 473
 474     return nc->info->has_vnet_hdr_len(nc, len);
 475 }
 476
 477 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 478 {
 479     if (!nc || !nc->info->using_vnet_hdr) {
 480         return;
 481     }
 482
 483     nc->info->using_vnet_hdr(nc, enable);
 484 }
 485
 486 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 487                           int ecn, int ufo)
 488 {
 489     if (!nc || !nc->info->set_offload) {
 490         return;
 491     }
 492
 493     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 494 }
 495
 496 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 497 {
 498     if (!nc || !nc->info->set_vnet_hdr_len) {
 499         return;
 500     }
 501
 502     nc->vnet_hdr_len = len;
 503     nc->info->set_vnet_hdr_len(nc, len);
 504 }
 505
 506 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 507 {
 508 #ifdef HOST_WORDS_BIGENDIAN
 509     if (!nc || !nc->info->set_vnet_le) {
 510         return -ENOSYS;
 511     }
 512
 513     return nc->info->set_vnet_le(nc, is_le);
 514 #else
 515     return 0;
 516 #endif
 517 }
 518
 519 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 520 {
 521 #ifdef HOST_WORDS_BIGENDIAN
 522     return 0;
 523 #else
 524     if (!nc || !nc->info->set_vnet_be) {
 525         return -ENOSYS;
 526     }
 527
 528     return nc->info->set_vnet_be(nc, is_be);
 529 #endif
 530 }
 531
 532 int qemu_can_receive_packet(NetClientState *nc)
 533 {
 534     if (nc->receive_disabled) {
 535         return 0;
 536     } else if (nc->info->can_receive &&
 537                !nc->info->can_receive(nc)) {
 538         return 0;
 539     }
 540     return 1;
 541 }
 542
 543 int qemu_can_send_packet(NetClientState *sender)
 544 {
 545     int vm_running = runstate_is_running();
 546
 547     if (!vm_running) {
 548         return 0;
 549     }
 550
 551     if (!sender->peer) {
 552         return 1;
 553     }
 554
 555     return qemu_can_receive_packet(sender->peer);
 556 }
 557
 558 static ssize_t filter_receive_iov(NetClientState *nc,
 559                                   NetFilterDirection direction,
 560                                   NetClientState *sender,
 561                                   unsigned flags,
 562                                   const struct iovec *iov,
 563                                   int iovcnt,
 564                                   NetPacketSent *sent_cb)
 565 {
 566     ssize_t ret = 0;
 567     NetFilterState *nf = NULL;
 568
 569     if (direction == NET_FILTER_DIRECTION_TX) {
 570         QTAILQ_FOREACH(nf, &nc->filters, next) {
 571             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 572                                          iovcnt, sent_cb);
 573             if (ret) {
 574                 return ret;
 575             }
 576         }
 577     } else {
 578         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 579             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 580                                          iovcnt, sent_cb);
 581             if (ret) {
 582                 return ret;
 583             }
 584         }
 585     }
 586
 587     return ret;
 588 }
 589
 590 static ssize_t filter_receive(NetClientState *nc,
 591                               NetFilterDirection direction,
 592                               NetClientState *sender,
 593                               unsigned flags,
 594                               const uint8_t *data,
 595                               size_t size,
 596                               NetPacketSent *sent_cb)
 597 {
 598     struct iovec iov = {
 599         .iov_base = (void *)data,
 600         .iov_len = size
 601     };
 602
 603     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 604 }
 605
 606 void qemu_purge_queued_packets(NetClientState *nc)
 607 {
 608     if (!nc->peer) {
 609         return;
 610     }
 611
 612     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 613 }
 614
 615 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 616 {
 617     nc->receive_disabled = 0;
 618
 619     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 620         if (net_hub_flush(nc->peer)) {
 621             qemu_notify_event();
 622         }
 623     }
 624     if (qemu_net_queue_flush(nc->incoming_queue)) {
 625         /* We emptied the queue successfully, signal to the IO thread to repoll
 626          * the file descriptor (for tap, for example).
 627          */
 628         qemu_notify_event();
 629     } else if (purge) {
 630         /* Unable to empty the queue, purge remaining packets */
 631         qemu_net_queue_purge(nc->incoming_queue, nc->peer);
 632     }
 633 }
 634
 635 void qemu_flush_queued_packets(NetClientState *nc)
 636 {
 637     qemu_flush_or_purge_queued_packets(nc, false);
 638 }
 639
 640 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 641                                                  unsigned flags,
 642                                                  const uint8_t *buf, int size,
 643                                                  NetPacketSent *sent_cb)
 644 {
 645     NetQueue *queue;
 646     int ret;
 647
 648 #ifdef DEBUG_NET
 649     printf("qemu_send_packet_async:\n");
 650     qemu_hexdump(stdout, "net", buf, size);
 651 #endif
 652
 653     if (sender->link_down || !sender->peer) {
 654         return size;
 655     }
 656
 657     /* Let filters handle the packet first */
 658     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 659                          sender, flags, buf, size, sent_cb);
 660     if (ret) {
 661         return ret;
 662     }
 663
 664     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 665                          sender, flags, buf, size, sent_cb);
 666     if (ret) {
 667         return ret;
 668     }
 669
 670     queue = sender->peer->incoming_queue;
 671
 672     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 673 }
 674
 675 ssize_t qemu_send_packet_async(NetClientState *sender,
 676                                const uint8_t *buf, int size,
 677                                NetPacketSent *sent_cb)
 678 {
 679     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 680                                              buf, size, sent_cb);
 681 }
 682
 683 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 684 {
 685     return qemu_send_packet_async(nc, buf, size, NULL);
 686 }
 687
 688 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size)
 689 {
 690     if (!qemu_can_receive_packet(nc)) {
 691         return 0;
 692     }
 693
 694     return qemu_net_queue_receive(nc->incoming_queue, buf, size);
 695 }
 696
 697 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov,
 698                                 int iovcnt)
 699 {
 700     if (!qemu_can_receive_packet(nc)) {
 701         return 0;
 702     }
 703
 704     return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt);
 705 }
 706
 707 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 708 {
 709     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 710                                              buf, size, NULL);
 711 }
 712
 713 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 714                                int iovcnt, unsigned flags)
 715 {
 716     uint8_t *buf = NULL;
 717     uint8_t *buffer;
 718     size_t offset;
 719     ssize_t ret;
 720
 721     if (iovcnt == 1) {
 722         buffer = iov[0].iov_base;
 723         offset = iov[0].iov_len;
 724     } else {
 725         offset = iov_size(iov, iovcnt);
 726         if (offset > NET_BUFSIZE) {
 727             return -1;
 728         }
 729         buf = g_malloc(offset);
 730         buffer = buf;
 731         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 732     }
 733
 734     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 735         ret = nc->info->receive_raw(nc, buffer, offset);
 736     } else {
 737         ret = nc->info->receive(nc, buffer, offset);
 738     }
 739
 740     g_free(buf);
 741     return ret;
 742 }
 743
 744 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 745                                        unsigned flags,
 746                                        const struct iovec *iov,
 747                                        int iovcnt,
 748                                        void *opaque)
 749 {
 750     NetClientState *nc = opaque;
 751     int ret;
 752
 753
 754     if (nc->link_down) {
 755         return iov_size(iov, iovcnt);
 756     }
 757
 758     if (nc->receive_disabled) {
 759         return 0;
 760     }
 761
 762     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 763         ret = nc->info->receive_iov(nc, iov, iovcnt);
 764     } else {
 765         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 766     }
 767
 768     if (ret == 0) {
 769         nc->receive_disabled = 1;
 770     }
 771
 772     return ret;
 773 }
 774
 775 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 776                                 const struct iovec *iov, int iovcnt,
 777                                 NetPacketSent *sent_cb)
 778 {
 779     NetQueue *queue;
 780     size_t size = iov_size(iov, iovcnt);
 781     int ret;
 782
 783     if (size > NET_BUFSIZE) {
 784         return size;
 785     }
 786
 787     if (sender->link_down || !sender->peer) {
 788         return size;
 789     }
 790
 791     /* Let filters handle the packet first */
 792     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 793                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 794     if (ret) {
 795         return ret;
 796     }
 797
 798     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 799                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 800     if (ret) {
 801         return ret;
 802     }
 803
 804     queue = sender->peer->incoming_queue;
 805
 806     return qemu_net_queue_send_iov(queue, sender,
 807                                    QEMU_NET_PACKET_FLAG_NONE,
 808                                    iov, iovcnt, sent_cb);
 809 }
 810
 811 ssize_t
 812 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 813 {
 814     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 815 }
 816
 817 NetClientState *qemu_find_netdev(const char *id)
 818 {
 819     NetClientState *nc;
 820
 821     QTAILQ_FOREACH(nc, &net_clients, next) {
 822         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 823             continue;
 824         if (!strcmp(nc->name, id)) {
 825             return nc;
 826         }
 827     }
 828
 829     return NULL;
 830 }
 831
 832 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 833                                  NetClientDriver type, int max)
 834 {
 835     NetClientState *nc;
 836     int ret = 0;
 837
 838     QTAILQ_FOREACH(nc, &net_clients, next) {
 839         if (nc->info->type == type) {
 840             continue;
 841         }
 842         if (!id || !strcmp(nc->name, id)) {
 843             if (ret < max) {
 844                 ncs[ret] = nc;
 845             }
 846             ret++;
 847         }
 848     }
 849
 850     return ret;
 851 }
 852
 853 static int nic_get_free_idx(void)
 854 {
 855     int index;
 856
 857     for (index = 0; index < MAX_NICS; index++)
 858         if (!nd_table[index].used)
 859             return index;
 860     return -1;
 861 }
 862
 863 int qemu_show_nic_models(const char *arg, const char *const *models)
 864 {
 865     int i;
 866
 867     if (!arg || !is_help_option(arg)) {
 868         return 0;
 869     }
 870
 871     printf("Supported NIC models:\n");
 872     for (i = 0 ; models[i]; i++) {
 873         printf("%s\n", models[i]);
 874     }
 875     return 1;
 876 }
 877
 878 void qemu_check_nic_model(NICInfo *nd, const char *model)
 879 {
 880     const char *models[2];
 881
 882     models[0] = model;
 883     models[1] = NULL;
 884
 885     if (qemu_show_nic_models(nd->model, models))
 886         exit(0);
 887     if (qemu_find_nic_model(nd, models, model) < 0)
 888         exit(1);
 889 }
 890
 891 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 892                         const char *default_model)
 893 {
 894     int i;
 895
 896     if (!nd->model)
 897         nd->model = g_strdup(default_model);
 898
 899     for (i = 0 ; models[i]; i++) {
 900         if (strcmp(nd->model, models[i]) == 0)
 901             return i;
 902     }
 903
 904     error_report("Unsupported NIC model: %s", nd->model);
 905     return -1;
 906 }
 907
 908 static int net_init_nic(const Netdev *netdev, const char *name,
 909                         NetClientState *peer, Error **errp)
 910 {
 911     int idx;
 912     NICInfo *nd;
 913     const NetLegacyNicOptions *nic;
 914
 915     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 916     nic = &netdev->u.nic;
 917
 918     idx = nic_get_free_idx();
 919     if (idx == -1 || nb_nics >= MAX_NICS) {
 920         error_setg(errp, "too many NICs");
 921         return -1;
 922     }
 923
 924     nd = &nd_table[idx];
 925
 926     memset(nd, 0, sizeof(*nd));
 927
 928     if (nic->has_netdev) {
 929         nd->netdev = qemu_find_netdev(nic->netdev);
 930         if (!nd->netdev) {
 931             error_setg(errp, "netdev '%s' not found", nic->netdev);
 932             return -1;
 933         }
 934     } else {
 935         assert(peer);
 936         nd->netdev = peer;
 937     }
 938     nd->name = g_strdup(name);
 939     if (nic->has_model) {
 940         nd->model = g_strdup(nic->model);
 941     }
 942     if (nic->has_addr) {
 943         nd->devaddr = g_strdup(nic->addr);
 944     }
 945
 946     if (nic->has_macaddr &&
 947         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 948         error_setg(errp, "invalid syntax for ethernet address");
 949         return -1;
 950     }
 951     if (nic->has_macaddr &&
 952         is_multicast_ether_addr(nd->macaddr.a)) {
 953         error_setg(errp,
 954                    "NIC cannot have multicast MAC address (odd 1st byte)");
 955         return -1;
 956     }
 957     qemu_macaddr_default_if_unset(&nd->macaddr);
 958
 959     if (nic->has_vectors) {
 960         if (nic->vectors > 0x7ffffff) {
 961             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 962             return -1;
 963         }
 964         nd->nvectors = nic->vectors;
 965     } else {
 966         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 967     }
 968
 969     nd->used = 1;
 970     nb_nics++;
 971
 972     return idx;
 973 }
 974
 975
 976 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 977     const Netdev *netdev,
 978     const char *name,
 979     NetClientState *peer, Error **errp) = {
 980         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 981 #ifdef CONFIG_SLIRP
 982         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 983 #endif
 984         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 985         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 986 #ifdef CONFIG_VDE
 987         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 988 #endif
 989 #ifdef CONFIG_NETMAP
 990         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 991 #endif
 992 #ifdef CONFIG_NET_BRIDGE
 993         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 994 #endif
 995         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 996 #ifdef CONFIG_VHOST_NET_USER
 997         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 998 #endif
 999 #ifdef CONFIG_VHOST_NET_VDPA
1000         [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
1001 #endif
1002 #ifdef CONFIG_L2TPV3
1003         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
1004 #endif
1005 };
1006
1007
1008 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
1009 {
1010     NetClientState *peer = NULL;
1011     NetClientState *nc;
1012
1013     if (is_netdev) {
1014         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
1015             !net_client_init_fun[netdev->type]) {
1016             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1017                        "a netdev backend type");
1018             return -1;
1019         }
1020     } else {
1021         if (netdev->type == NET_CLIENT_DRIVER_NONE) {
1022             return 0; /* nothing to do */
1023         }
1024         if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
1025             !net_client_init_fun[netdev->type]) {
1026             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1027                        "a net backend type (maybe it is not compiled "
1028                        "into this binary)");
1029             return -1;
1030         }
1031
1032         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1033         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1034             !netdev->u.nic.has_netdev) {
1035             peer = net_hub_add_port(0, NULL, NULL);
1036         }
1037     }
1038
1039     nc = qemu_find_netdev(netdev->id);
1040     if (nc) {
1041         error_setg(errp, "Duplicate ID '%s'", netdev->id);
1042         return -1;
1043     }
1044
1045     if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1046         /* FIXME drop when all init functions store an Error */
1047         if (errp && !*errp) {
1048             error_setg(errp, "Device '%s' could not be initialized",
1049                        NetClientDriver_str(netdev->type));
1050         }
1051         return -1;
1052     }
1053
1054     if (is_netdev) {
1055         nc = qemu_find_netdev(netdev->id);
1056         assert(nc);
1057         nc->is_netdev = true;
1058     }
1059
1060     return 0;
1061 }
1062
1063 void show_netdevs(void)
1064 {
1065     int idx;
1066     const char *available_netdevs[] = {
1067         "socket",
1068         "hubport",
1069         "tap",
1070 #ifdef CONFIG_SLIRP
1071         "user",
1072 #endif
1073 #ifdef CONFIG_L2TPV3
1074         "l2tpv3",
1075 #endif
1076 #ifdef CONFIG_VDE
1077         "vde",
1078 #endif
1079 #ifdef CONFIG_NET_BRIDGE
1080         "bridge",
1081 #endif
1082 #ifdef CONFIG_NETMAP
1083         "netmap",
1084 #endif
1085 #ifdef CONFIG_POSIX
1086         "vhost-user",
1087 #endif
1088 #ifdef CONFIG_VHOST_VDPA
1089         "vhost-vdpa",
1090 #endif
1091     };
1092
1093     qemu_printf("Available netdev backend types:\n");
1094     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1095         qemu_printf("%s\n", available_netdevs[idx]);
1096     }
1097 }
1098
1099 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1100 {
1101     gchar **substrings = NULL;
1102     Netdev *object = NULL;
1103     int ret = -1;
1104     Visitor *v = opts_visitor_new(opts);
1105
1106     /* Parse convenience option format ip6-net=fec0::0[/64] */
1107     const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1108
1109     if (ip6_net) {
1110         char *prefix_addr;
1111         unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1112
1113         substrings = g_strsplit(ip6_net, "/", 2);
1114         if (!substrings || !substrings[0]) {
1115             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1116                        "a valid IPv6 prefix");
1117             goto out;
1118         }
1119
1120         prefix_addr = substrings[0];
1121
1122         /* Handle user-specified prefix length. */
1123         if (substrings[1] &&
1124             qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1125         {
1126             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1127                        "ipv6-prefixlen", "a number");
1128             goto out;
1129         }
1130
1131         qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1132         qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1133                             &error_abort);
1134         qemu_opt_unset(opts, "ipv6-net");
1135     }
1136
1137     /* Create an ID for -net if the user did not specify one */
1138     if (!is_netdev && !qemu_opts_id(opts)) {
1139         qemu_opts_set_id(opts, id_generate(ID_NET));
1140     }
1141
1142     if (visit_type_Netdev(v, NULL, &object, errp)) {
1143         ret = net_client_init1(object, is_netdev, errp);
1144     }
1145
1146     qapi_free_Netdev(object);
1147
1148 out:
1149     g_strfreev(substrings);
1150     visit_free(v);
1151     return ret;
1152 }
1153
1154 void netdev_add(QemuOpts *opts, Error **errp)
1155 {
1156     net_client_init(opts, true, errp);
1157 }
1158
1159 void qmp_netdev_add(Netdev *netdev, Error **errp)
1160 {
1161     if (!id_wellformed(netdev->id)) {
1162         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
1163         return;
1164     }
1165
1166     net_client_init1(netdev, true, errp);
1167 }
1168
1169 void qmp_netdev_del(const char *id, Error **errp)
1170 {
1171     NetClientState *nc;
1172     QemuOpts *opts;
1173
1174     nc = qemu_find_netdev(id);
1175     if (!nc) {
1176         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1177                   "Device '%s' not found", id);
1178         return;
1179     }
1180
1181     if (!nc->is_netdev) {
1182         error_setg(errp, "Device '%s' is not a netdev", id);
1183         return;
1184     }
1185
1186     qemu_del_net_client(nc);
1187
1188     /*
1189      * Wart: we need to delete the QemuOpts associated with netdevs
1190      * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in
1191      * HMP netdev_add.
1192      */
1193     opts = qemu_opts_find(qemu_find_opts("netdev"), id);
1194     if (opts) {
1195         qemu_opts_del(opts);
1196     }
1197 }
1198
1199 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1200 {
1201     char *str;
1202     ObjectProperty *prop;
1203     ObjectPropertyIterator iter;
1204     Visitor *v;
1205
1206     /* generate info str */
1207     object_property_iter_init(&iter, OBJECT(nf));
1208     while ((prop = object_property_iter_next(&iter))) {
1209         if (!strcmp(prop->name, "type")) {
1210             continue;
1211         }
1212         v = string_output_visitor_new(false, &str);
1213         object_property_get(OBJECT(nf), prop->name, v, NULL);
1214         visit_complete(v, &str);
1215         visit_free(v);
1216         monitor_printf(mon, ",%s=%s", prop->name, str);
1217         g_free(str);
1218     }
1219     monitor_printf(mon, "\n");
1220 }
1221
1222 void print_net_client(Monitor *mon, NetClientState *nc)
1223 {
1224     NetFilterState *nf;
1225
1226     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1227                    nc->queue_index,
1228                    NetClientDriver_str(nc->info->type),
1229                    nc->info_str);
1230     if (!QTAILQ_EMPTY(&nc->filters)) {
1231         monitor_printf(mon, "filters:\n");
1232     }
1233     QTAILQ_FOREACH(nf, &nc->filters, next) {
1234         monitor_printf(mon, "  - %s: type=%s",
1235                        object_get_canonical_path_component(OBJECT(nf)),
1236                        object_get_typename(OBJECT(nf)));
1237         netfilter_print_info(mon, nf);
1238     }
1239 }
1240
1241 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1242                                       Error **errp)
1243 {
1244     NetClientState *nc;
1245     RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
1246
1247     QTAILQ_FOREACH(nc, &net_clients, next) {
1248         RxFilterInfo *info;
1249
1250         if (has_name && strcmp(nc->name, name) != 0) {
1251             continue;
1252         }
1253
1254         /* only query rx-filter information of NIC */
1255         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1256             if (has_name) {
1257                 error_setg(errp, "net client(%s) isn't a NIC", name);
1258                 assert(!filter_list);
1259                 return NULL;
1260             }
1261             continue;
1262         }
1263
1264         /* only query information on queue 0 since the info is per nic,
1265          * not per queue
1266          */
1267         if (nc->queue_index != 0)
1268             continue;
1269
1270         if (nc->info->query_rx_filter) {
1271             info = nc->info->query_rx_filter(nc);
1272             QAPI_LIST_APPEND(tail, info);
1273         } else if (has_name) {
1274             error_setg(errp, "net client(%s) doesn't support"
1275                        " rx-filter querying", name);
1276             assert(!filter_list);
1277             return NULL;
1278         }
1279
1280         if (has_name) {
1281             break;
1282         }
1283     }
1284
1285     if (filter_list == NULL && has_name) {
1286         error_setg(errp, "invalid net client name: %s", name);
1287     }
1288
1289     return filter_list;
1290 }
1291
1292 void hmp_info_network(Monitor *mon, const QDict *qdict)
1293 {
1294     NetClientState *nc, *peer;
1295     NetClientDriver type;
1296
1297     net_hub_info(mon);
1298
1299     QTAILQ_FOREACH(nc, &net_clients, next) {
1300         peer = nc->peer;
1301         type = nc->info->type;
1302
1303         /* Skip if already printed in hub info */
1304         if (net_hub_id_for_client(nc, NULL) == 0) {
1305             continue;
1306         }
1307
1308         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1309             print_net_client(mon, nc);
1310         } /* else it's a netdev connected to a NIC, printed with the NIC */
1311         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1312             monitor_printf(mon, " \\ ");
1313             print_net_client(mon, peer);
1314         }
1315     }
1316 }
1317
1318 void colo_notify_filters_event(int event, Error **errp)
1319 {
1320     NetClientState *nc;
1321     NetFilterState *nf;
1322     NetFilterClass *nfc = NULL;
1323     Error *local_err = NULL;
1324
1325     QTAILQ_FOREACH(nc, &net_clients, next) {
1326         QTAILQ_FOREACH(nf, &nc->filters, next) {
1327             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1328             nfc->handle_event(nf, event, &local_err);
1329             if (local_err) {
1330                 error_propagate(errp, local_err);
1331                 return;
1332             }
1333         }
1334     }
1335 }
1336
1337 void qmp_set_link(const char *name, bool up, Error **errp)
1338 {
1339     NetClientState *ncs[MAX_QUEUE_NUM];
1340     NetClientState *nc;
1341     int queues, i;
1342
1343     queues = qemu_find_net_clients_except(name, ncs,
1344                                           NET_CLIENT_DRIVER__MAX,
1345                                           MAX_QUEUE_NUM);
1346
1347     if (queues == 0) {
1348         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1349                   "Device '%s' not found", name);
1350         return;
1351     }
1352     nc = ncs[0];
1353
1354     for (i = 0; i < queues; i++) {
1355         ncs[i]->link_down = !up;
1356     }
1357
1358     if (nc->info->link_status_changed) {
1359         nc->info->link_status_changed(nc);
1360     }
1361
1362     if (nc->peer) {
1363         /* Change peer link only if the peer is NIC and then notify peer.
1364          * If the peer is a HUBPORT or a backend, we do not change the
1365          * link status.
1366          *
1367          * This behavior is compatible with qemu hubs where there could be
1368          * multiple clients that can still communicate with each other in
1369          * disconnected mode. For now maintain this compatibility.
1370          */
1371         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1372             for (i = 0; i < queues; i++) {
1373                 ncs[i]->peer->link_down = !up;
1374             }
1375         }
1376         if (nc->peer->info->link_status_changed) {
1377             nc->peer->info->link_status_changed(nc->peer);
1378         }
1379     }
1380 }
1381
1382 static void net_vm_change_state_handler(void *opaque, bool running,
1383                                         RunState state)
1384 {
1385     NetClientState *nc;
1386     NetClientState *tmp;
1387
1388     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1389         if (running) {
1390             /* Flush queued packets and wake up backends. */
1391             if (nc->peer && qemu_can_send_packet(nc)) {
1392                 qemu_flush_queued_packets(nc->peer);
1393             }
1394         } else {
1395             /* Complete all queued packets, to guarantee we don't modify
1396              * state later when VM is not running.
1397              */
1398             qemu_flush_or_purge_queued_packets(nc, true);
1399         }
1400     }
1401 }
1402
1403 void net_cleanup(void)
1404 {
1405     NetClientState *nc;
1406
1407     /* We may del multiple entries during qemu_del_net_client(),
1408      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1409      */
1410     while (!QTAILQ_EMPTY(&net_clients)) {
1411         nc = QTAILQ_FIRST(&net_clients);
1412         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1413             qemu_del_nic(qemu_get_nic(nc));
1414         } else {
1415             qemu_del_net_client(nc);
1416         }
1417     }
1418
1419     qemu_del_vm_change_state_handler(net_change_state_entry);
1420 }
1421
1422 void net_check_clients(void)
1423 {
1424     NetClientState *nc;
1425     int i;
1426
1427     net_hub_check_clients();
1428
1429     QTAILQ_FOREACH(nc, &net_clients, next) {
1430         if (!nc->peer) {
1431             warn_report("%s %s has no peer",
1432                         nc->info->type == NET_CLIENT_DRIVER_NIC
1433                         ? "nic" : "netdev",
1434                         nc->name);
1435         }
1436     }
1437
1438     /* Check that all NICs requested via -net nic actually got created.
1439      * NICs created via -device don't need to be checked here because
1440      * they are always instantiated.
1441      */
1442     for (i = 0; i < MAX_NICS; i++) {
1443         NICInfo *nd = &nd_table[i];
1444         if (nd->used && !nd->instantiated) {
1445             warn_report("requested NIC (%s, model %s) "
1446                         "was not created (not supported by this machine?)",
1447                         nd->name ? nd->name : "anonymous",
1448                         nd->model ? nd->model : "unspecified");
1449         }
1450     }
1451 }
1452
1453 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1454 {
1455     return net_client_init(opts, false, errp);
1456 }
1457
1458 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1459 {
1460     const char *type = qemu_opt_get(opts, "type");
1461
1462     if (type && is_help_option(type)) {
1463         show_netdevs();
1464         exit(0);
1465     }
1466     return net_client_init(opts, true, errp);
1467 }
1468
1469 /* For the convenience "--nic" parameter */
1470 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1471 {
1472     char *mac, *nd_id;
1473     int idx, ret;
1474     NICInfo *ni;
1475     const char *type;
1476
1477     type = qemu_opt_get(opts, "type");
1478     if (type && g_str_equal(type, "none")) {
1479         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1480     }
1481
1482     idx = nic_get_free_idx();
1483     if (idx == -1 || nb_nics >= MAX_NICS) {
1484         error_setg(errp, "no more on-board/default NIC slots available");
1485         return -1;
1486     }
1487
1488     if (!type) {
1489         qemu_opt_set(opts, "type", "user", &error_abort);
1490     }
1491
1492     ni = &nd_table[idx];
1493     memset(ni, 0, sizeof(*ni));
1494     ni->model = qemu_opt_get_del(opts, "model");
1495
1496     /* Create an ID if the user did not specify one */
1497     nd_id = g_strdup(qemu_opts_id(opts));
1498     if (!nd_id) {
1499         nd_id = id_generate(ID_NET);
1500         qemu_opts_set_id(opts, nd_id);
1501     }
1502
1503     /* Handle MAC address */
1504     mac = qemu_opt_get_del(opts, "mac");
1505     if (mac) {
1506         ret = net_parse_macaddr(ni->macaddr.a, mac);
1507         g_free(mac);
1508         if (ret) {
1509             error_setg(errp, "invalid syntax for ethernet address");
1510             goto out;
1511         }
1512         if (is_multicast_ether_addr(ni->macaddr.a)) {
1513             error_setg(errp, "NIC cannot have multicast MAC address");
1514             ret = -1;
1515             goto out;
1516         }
1517     }
1518     qemu_macaddr_default_if_unset(&ni->macaddr);
1519
1520     ret = net_client_init(opts, true, errp);
1521     if (ret == 0) {
1522         ni->netdev = qemu_find_netdev(nd_id);
1523         ni->used = true;
1524         nb_nics++;
1525     }
1526
1527 out:
1528     g_free(nd_id);
1529     return ret;
1530 }
1531
1532 int net_init_clients(Error **errp)
1533 {
1534     net_change_state_entry =
1535         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1536
1537     QTAILQ_INIT(&net_clients);
1538
1539     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1540                           net_init_netdev, NULL, errp)) {
1541         return -1;
1542     }
1543
1544     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1545         return -1;
1546     }
1547
1548     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1549         return -1;
1550     }
1551
1552     return 0;
1553 }
1554
1555 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1556 {
1557     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1558         return -1;
1559     }
1560
1561     return 0;
1562 }
1563
1564 /* From FreeBSD */
1565 /* XXX: optimize */
1566 uint32_t net_crc32(const uint8_t *p, int len)
1567 {
1568     uint32_t crc;
1569     int carry, i, j;
1570     uint8_t b;
1571
1572     crc = 0xffffffff;
1573     for (i = 0; i < len; i++) {
1574         b = *p++;
1575         for (j = 0; j < 8; j++) {
1576             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1577             crc <<= 1;
1578             b >>= 1;
1579             if (carry) {
1580                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1581             }
1582         }
1583     }
1584
1585     return crc;
1586 }
1587
1588 uint32_t net_crc32_le(const uint8_t *p, int len)
1589 {
1590     uint32_t crc;
1591     int carry, i, j;
1592     uint8_t b;
1593
1594     crc = 0xffffffff;
1595     for (i = 0; i < len; i++) {
1596         b = *p++;
1597         for (j = 0; j < 8; j++) {
1598             carry = (crc & 0x1) ^ (b & 0x01);
1599             crc >>= 1;
1600             b >>= 1;
1601             if (carry) {
1602                 crc ^= POLYNOMIAL_LE;
1603             }
1604         }
1605     }
1606
1607     return crc;
1608 }
1609
1610 QemuOptsList qemu_netdev_opts = {
1611     .name = "netdev",
1612     .implied_opt_name = "type",
1613     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1614     .desc = {
1615         /*
1616          * no elements => accept any params
1617          * validation will happen later
1618          */
1619         { /* end of list */ }
1620     },
1621 };
1622
1623 QemuOptsList qemu_nic_opts = {
1624     .name = "nic",
1625     .implied_opt_name = "type",
1626     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1627     .desc = {
1628         /*
1629          * no elements => accept any params
1630          * validation will happen later
1631          */
1632         { /* end of list */ }
1633     },
1634 };
1635
1636 QemuOptsList qemu_net_opts = {
1637     .name = "net",
1638     .implied_opt_name = "type",
1639     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1640     .desc = {
1641         /*
1642          * no elements => accept any params
1643          * validation will happen later
1644          */
1645         { /* end of list */ }
1646     },
1647 };
1648
1649 void net_socket_rs_init(SocketReadState *rs,
1650                         SocketReadStateFinalize *finalize,
1651                         bool vnet_hdr)
1652 {
1653     rs->state = 0;
1654     rs->vnet_hdr = vnet_hdr;
1655     rs->index = 0;
1656     rs->packet_len = 0;
1657     rs->vnet_hdr_len = 0;
1658     memset(rs->buf, 0, sizeof(rs->buf));
1659     rs->finalize = finalize;
1660 }
1661
1662 /*
1663  * Returns
1664  * 0: success
1665  * -1: error occurs
1666  */
1667 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1668 {
1669     unsigned int l;
1670
1671     while (size > 0) {
1672         /* Reassemble a packet from the network.
1673          * 0 = getting length.
1674          * 1 = getting vnet header length.
1675          * 2 = getting data.
1676          */
1677         switch (rs->state) {
1678         case 0:
1679             l = 4 - rs->index;
1680             if (l > size) {
1681                 l = size;
1682             }
1683             memcpy(rs->buf + rs->index, buf, l);
1684             buf += l;
1685             size -= l;
1686             rs->index += l;
1687             if (rs->index == 4) {
1688                 /* got length */
1689                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1690                 rs->index = 0;
1691                 if (rs->vnet_hdr) {
1692                     rs->state = 1;
1693                 } else {
1694                     rs->state = 2;
1695                     rs->vnet_hdr_len = 0;
1696                 }
1697             }
1698             break;
1699         case 1:
1700             l = 4 - rs->index;
1701             if (l > size) {
1702                 l = size;
1703             }
1704             memcpy(rs->buf + rs->index, buf, l);
1705             buf += l;
1706             size -= l;
1707             rs->index += l;
1708             if (rs->index == 4) {
1709                 /* got vnet header length */
1710                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1711                 rs->index = 0;
1712                 rs->state = 2;
1713             }
1714             break;
1715         case 2:
1716             l = rs->packet_len - rs->index;
1717             if (l > size) {
1718                 l = size;
1719             }
1720             if (rs->index + l <= sizeof(rs->buf)) {
1721                 memcpy(rs->buf + rs->index, buf, l);
1722             } else {
1723                 fprintf(stderr, "serious error: oversized packet received,"
1724                     "connection terminated.\n");
1725                 rs->index = rs->state = 0;
1726                 return -1;
1727             }
1728
1729             rs->index += l;
1730             buf += l;
1731             size -= l;
1732             if (rs->index >= rs->packet_len) {
1733                 rs->index = 0;
1734                 rs->state = 0;
1735                 assert(rs->finalize);
1736                 rs->finalize(rs);
1737             }
1738             break;
1739         }
1740     }
1741
1742     assert(size == 0);
1743     return 0;
1744 }