net/net.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26
  27 #include "net/net.h"
  28 #include "clients.h"
  29 #include "hub.h"
  30 #include "net/slirp.h"
  31 #include "net/eth.h"
  32 #include "util.h"
  33
  34 #include "monitor/monitor.h"
  35 #include "qemu/help_option.h"
  36 #include "qapi/qapi-commands-net.h"
  37 #include "qapi/qapi-visit-net.h"
  38 #include "qapi/qmp/qdict.h"
  39 #include "qapi/qmp/qerror.h"
  40 #include "qemu/error-report.h"
  41 #include "qemu/sockets.h"
  42 #include "qemu/cutils.h"
  43 #include "qemu/config-file.h"
  44 #include "qemu/ctype.h"
  45 #include "hw/qdev.h"
  46 #include "qemu/iov.h"
  47 #include "qemu/main-loop.h"
  48 #include "qemu/option.h"
  49 #include "qapi/error.h"
  50 #include "qapi/opts-visitor.h"
  51 #include "sysemu/sysemu.h"
  52 #include "sysemu/qtest.h"
  53 #include "net/filter.h"
  54 #include "qapi/string-output-visitor.h"
  55
  56 /* Net bridge is currently not supported for W32. */
  57 #if !defined(_WIN32)
  58 # define CONFIG_NET_BRIDGE
  59 #endif
  60
  61 static VMChangeStateEntry *net_change_state_entry;
  62 static QTAILQ_HEAD(, NetClientState) net_clients;
  63
  64 /***********************************************************/
  65 /* network device redirectors */
  66
  67 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  68 {
  69     const char *p, *p1;
  70     int len;
  71     p = *pp;
  72     p1 = strchr(p, sep);
  73     if (!p1)
  74         return -1;
  75     len = p1 - p;
  76     p1++;
  77     if (buf_size > 0) {
  78         if (len > buf_size - 1)
  79             len = buf_size - 1;
  80         memcpy(buf, p, len);
  81         buf[len] = '\0';
  82     }
  83     *pp = p1;
  84     return 0;
  85 }
  86
  87 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  88                     Error **errp)
  89 {
  90     char buf[512];
  91     struct hostent *he;
  92     const char *p, *r;
  93     int port;
  94
  95     p = str;
  96     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
  97         error_setg(errp, "host address '%s' doesn't contain ':' "
  98                    "separating host from port", str);
  99         return -1;
 100     }
 101     saddr->sin_family = AF_INET;
 102     if (buf[0] == '\0') {
 103         saddr->sin_addr.s_addr = 0;
 104     } else {
 105         if (qemu_isdigit(buf[0])) {
 106             if (!inet_aton(buf, &saddr->sin_addr)) {
 107                 error_setg(errp, "host address '%s' is not a valid "
 108                            "IPv4 address", buf);
 109                 return -1;
 110             }
 111         } else {
 112             he = gethostbyname(buf);
 113             if (he == NULL) {
 114                 error_setg(errp, "can't resolve host address '%s'", buf);
 115                 return - 1;
 116             }
 117             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 118         }
 119     }
 120     port = strtol(p, (char **)&r, 0);
 121     if (r == p) {
 122         error_setg(errp, "port number '%s' is invalid", p);
 123         return -1;
 124     }
 125     saddr->sin_port = htons(port);
 126     return 0;
 127 }
 128
 129 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 130 {
 131     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 132                            macaddr[0], macaddr[1], macaddr[2],
 133                            macaddr[3], macaddr[4], macaddr[5]);
 134 }
 135
 136 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 137 {
 138     snprintf(nc->info_str, sizeof(nc->info_str),
 139              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 140              nc->model,
 141              macaddr[0], macaddr[1], macaddr[2],
 142              macaddr[3], macaddr[4], macaddr[5]);
 143 }
 144
 145 static int mac_table[256] = {0};
 146
 147 static void qemu_macaddr_set_used(MACAddr *macaddr)
 148 {
 149     int index;
 150
 151     for (index = 0x56; index < 0xFF; index++) {
 152         if (macaddr->a[5] == index) {
 153             mac_table[index]++;
 154         }
 155     }
 156 }
 157
 158 static void qemu_macaddr_set_free(MACAddr *macaddr)
 159 {
 160     int index;
 161     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 162
 163     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 164         return;
 165     }
 166     for (index = 0x56; index < 0xFF; index++) {
 167         if (macaddr->a[5] == index) {
 168             mac_table[index]--;
 169         }
 170     }
 171 }
 172
 173 static int qemu_macaddr_get_free(void)
 174 {
 175     int index;
 176
 177     for (index = 0x56; index < 0xFF; index++) {
 178         if (mac_table[index] == 0) {
 179             return index;
 180         }
 181     }
 182
 183     return -1;
 184 }
 185
 186 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 187 {
 188     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 189     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 190
 191     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 192         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 193             return;
 194         } else {
 195             qemu_macaddr_set_used(macaddr);
 196             return;
 197         }
 198     }
 199
 200     macaddr->a[0] = 0x52;
 201     macaddr->a[1] = 0x54;
 202     macaddr->a[2] = 0x00;
 203     macaddr->a[3] = 0x12;
 204     macaddr->a[4] = 0x34;
 205     macaddr->a[5] = qemu_macaddr_get_free();
 206     qemu_macaddr_set_used(macaddr);
 207 }
 208
 209 /**
 210  * Generate a name for net client
 211  *
 212  * Only net clients created with the legacy -net option and NICs need this.
 213  */
 214 static char *assign_name(NetClientState *nc1, const char *model)
 215 {
 216     NetClientState *nc;
 217     int id = 0;
 218
 219     QTAILQ_FOREACH(nc, &net_clients, next) {
 220         if (nc == nc1) {
 221             continue;
 222         }
 223         if (strcmp(nc->model, model) == 0) {
 224             id++;
 225         }
 226     }
 227
 228     return g_strdup_printf("%s.%d", model, id);
 229 }
 230
 231 static void qemu_net_client_destructor(NetClientState *nc)
 232 {
 233     g_free(nc);
 234 }
 235 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 236                                        unsigned flags,
 237                                        const struct iovec *iov,
 238                                        int iovcnt,
 239                                        void *opaque);
 240
 241 static void qemu_net_client_setup(NetClientState *nc,
 242                                   NetClientInfo *info,
 243                                   NetClientState *peer,
 244                                   const char *model,
 245                                   const char *name,
 246                                   NetClientDestructor *destructor)
 247 {
 248     nc->info = info;
 249     nc->model = g_strdup(model);
 250     if (name) {
 251         nc->name = g_strdup(name);
 252     } else {
 253         nc->name = assign_name(nc, model);
 254     }
 255
 256     if (peer) {
 257         assert(!peer->peer);
 258         nc->peer = peer;
 259         peer->peer = nc;
 260     }
 261     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 262
 263     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 264     nc->destructor = destructor;
 265     QTAILQ_INIT(&nc->filters);
 266 }
 267
 268 NetClientState *qemu_new_net_client(NetClientInfo *info,
 269                                     NetClientState *peer,
 270                                     const char *model,
 271                                     const char *name)
 272 {
 273     NetClientState *nc;
 274
 275     assert(info->size >= sizeof(NetClientState));
 276
 277     nc = g_malloc0(info->size);
 278     qemu_net_client_setup(nc, info, peer, model, name,
 279                           qemu_net_client_destructor);
 280
 281     return nc;
 282 }
 283
 284 NICState *qemu_new_nic(NetClientInfo *info,
 285                        NICConf *conf,
 286                        const char *model,
 287                        const char *name,
 288                        void *opaque)
 289 {
 290     NetClientState **peers = conf->peers.ncs;
 291     NICState *nic;
 292     int i, queues = MAX(1, conf->peers.queues);
 293
 294     assert(info->type == NET_CLIENT_DRIVER_NIC);
 295     assert(info->size >= sizeof(NICState));
 296
 297     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 298     nic->ncs = (void *)nic + info->size;
 299     nic->conf = conf;
 300     nic->opaque = opaque;
 301
 302     for (i = 0; i < queues; i++) {
 303         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 304                               NULL);
 305         nic->ncs[i].queue_index = i;
 306     }
 307
 308     return nic;
 309 }
 310
 311 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 312 {
 313     return nic->ncs + queue_index;
 314 }
 315
 316 NetClientState *qemu_get_queue(NICState *nic)
 317 {
 318     return qemu_get_subqueue(nic, 0);
 319 }
 320
 321 NICState *qemu_get_nic(NetClientState *nc)
 322 {
 323     NetClientState *nc0 = nc - nc->queue_index;
 324
 325     return (NICState *)((void *)nc0 - nc->info->size);
 326 }
 327
 328 void *qemu_get_nic_opaque(NetClientState *nc)
 329 {
 330     NICState *nic = qemu_get_nic(nc);
 331
 332     return nic->opaque;
 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     /* If this is a peer NIC and peer has already been deleted, free it now. */
 415     if (nic->peer_deleted) {
 416         for (i = 0; i < queues; i++) {
 417             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 418         }
 419     }
 420
 421     for (i = queues - 1; i >= 0; i--) {
 422         NetClientState *nc = qemu_get_subqueue(nic, i);
 423
 424         qemu_cleanup_net_client(nc);
 425         qemu_free_net_client(nc);
 426     }
 427
 428     g_free(nic);
 429 }
 430
 431 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 432 {
 433     NetClientState *nc;
 434
 435     QTAILQ_FOREACH(nc, &net_clients, next) {
 436         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 437             if (nc->queue_index == 0) {
 438                 func(qemu_get_nic(nc), opaque);
 439             }
 440         }
 441     }
 442 }
 443
 444 bool qemu_has_ufo(NetClientState *nc)
 445 {
 446     if (!nc || !nc->info->has_ufo) {
 447         return false;
 448     }
 449
 450     return nc->info->has_ufo(nc);
 451 }
 452
 453 bool qemu_has_vnet_hdr(NetClientState *nc)
 454 {
 455     if (!nc || !nc->info->has_vnet_hdr) {
 456         return false;
 457     }
 458
 459     return nc->info->has_vnet_hdr(nc);
 460 }
 461
 462 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 463 {
 464     if (!nc || !nc->info->has_vnet_hdr_len) {
 465         return false;
 466     }
 467
 468     return nc->info->has_vnet_hdr_len(nc, len);
 469 }
 470
 471 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 472 {
 473     if (!nc || !nc->info->using_vnet_hdr) {
 474         return;
 475     }
 476
 477     nc->info->using_vnet_hdr(nc, enable);
 478 }
 479
 480 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 481                           int ecn, int ufo)
 482 {
 483     if (!nc || !nc->info->set_offload) {
 484         return;
 485     }
 486
 487     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 488 }
 489
 490 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 491 {
 492     if (!nc || !nc->info->set_vnet_hdr_len) {
 493         return;
 494     }
 495
 496     nc->vnet_hdr_len = len;
 497     nc->info->set_vnet_hdr_len(nc, len);
 498 }
 499
 500 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 501 {
 502 #ifdef HOST_WORDS_BIGENDIAN
 503     if (!nc || !nc->info->set_vnet_le) {
 504         return -ENOSYS;
 505     }
 506
 507     return nc->info->set_vnet_le(nc, is_le);
 508 #else
 509     return 0;
 510 #endif
 511 }
 512
 513 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 514 {
 515 #ifdef HOST_WORDS_BIGENDIAN
 516     return 0;
 517 #else
 518     if (!nc || !nc->info->set_vnet_be) {
 519         return -ENOSYS;
 520     }
 521
 522     return nc->info->set_vnet_be(nc, is_be);
 523 #endif
 524 }
 525
 526 int qemu_can_send_packet(NetClientState *sender)
 527 {
 528     int vm_running = runstate_is_running();
 529
 530     if (!vm_running) {
 531         return 0;
 532     }
 533
 534     if (!sender->peer) {
 535         return 1;
 536     }
 537
 538     if (sender->peer->receive_disabled) {
 539         return 0;
 540     } else if (sender->peer->info->can_receive &&
 541                !sender->peer->info->can_receive(sender->peer)) {
 542         return 0;
 543     }
 544     return 1;
 545 }
 546
 547 static ssize_t filter_receive_iov(NetClientState *nc,
 548                                   NetFilterDirection direction,
 549                                   NetClientState *sender,
 550                                   unsigned flags,
 551                                   const struct iovec *iov,
 552                                   int iovcnt,
 553                                   NetPacketSent *sent_cb)
 554 {
 555     ssize_t ret = 0;
 556     NetFilterState *nf = NULL;
 557
 558     if (direction == NET_FILTER_DIRECTION_TX) {
 559         QTAILQ_FOREACH(nf, &nc->filters, next) {
 560             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 561                                          iovcnt, sent_cb);
 562             if (ret) {
 563                 return ret;
 564             }
 565         }
 566     } else {
 567         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 568             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 569                                          iovcnt, sent_cb);
 570             if (ret) {
 571                 return ret;
 572             }
 573         }
 574     }
 575
 576     return ret;
 577 }
 578
 579 static ssize_t filter_receive(NetClientState *nc,
 580                               NetFilterDirection direction,
 581                               NetClientState *sender,
 582                               unsigned flags,
 583                               const uint8_t *data,
 584                               size_t size,
 585                               NetPacketSent *sent_cb)
 586 {
 587     struct iovec iov = {
 588         .iov_base = (void *)data,
 589         .iov_len = size
 590     };
 591
 592     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 593 }
 594
 595 void qemu_purge_queued_packets(NetClientState *nc)
 596 {
 597     if (!nc->peer) {
 598         return;
 599     }
 600
 601     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 602 }
 603
 604 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 605 {
 606     nc->receive_disabled = 0;
 607
 608     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 609         if (net_hub_flush(nc->peer)) {
 610             qemu_notify_event();
 611         }
 612     }
 613     if (qemu_net_queue_flush(nc->incoming_queue)) {
 614         /* We emptied the queue successfully, signal to the IO thread to repoll
 615          * the file descriptor (for tap, for example).
 616          */
 617         qemu_notify_event();
 618     } else if (purge) {
 619         /* Unable to empty the queue, purge remaining packets */
 620         qemu_net_queue_purge(nc->incoming_queue, nc);
 621     }
 622 }
 623
 624 void qemu_flush_queued_packets(NetClientState *nc)
 625 {
 626     qemu_flush_or_purge_queued_packets(nc, false);
 627 }
 628
 629 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 630                                                  unsigned flags,
 631                                                  const uint8_t *buf, int size,
 632                                                  NetPacketSent *sent_cb)
 633 {
 634     NetQueue *queue;
 635     int ret;
 636
 637 #ifdef DEBUG_NET
 638     printf("qemu_send_packet_async:\n");
 639     qemu_hexdump((const char *)buf, stdout, "net", size);
 640 #endif
 641
 642     if (sender->link_down || !sender->peer) {
 643         return size;
 644     }
 645
 646     /* Let filters handle the packet first */
 647     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 648                          sender, flags, buf, size, sent_cb);
 649     if (ret) {
 650         return ret;
 651     }
 652
 653     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 654                          sender, flags, buf, size, sent_cb);
 655     if (ret) {
 656         return ret;
 657     }
 658
 659     queue = sender->peer->incoming_queue;
 660
 661     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 662 }
 663
 664 ssize_t qemu_send_packet_async(NetClientState *sender,
 665                                const uint8_t *buf, int size,
 666                                NetPacketSent *sent_cb)
 667 {
 668     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 669                                              buf, size, sent_cb);
 670 }
 671
 672 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 673 {
 674     return qemu_send_packet_async(nc, buf, size, NULL);
 675 }
 676
 677 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 678 {
 679     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 680                                              buf, size, NULL);
 681 }
 682
 683 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 684                                int iovcnt, unsigned flags)
 685 {
 686     uint8_t *buf = NULL;
 687     uint8_t *buffer;
 688     size_t offset;
 689     ssize_t ret;
 690
 691     if (iovcnt == 1) {
 692         buffer = iov[0].iov_base;
 693         offset = iov[0].iov_len;
 694     } else {
 695         offset = iov_size(iov, iovcnt);
 696         if (offset > NET_BUFSIZE) {
 697             return -1;
 698         }
 699         buf = g_malloc(offset);
 700         buffer = buf;
 701         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 702     }
 703
 704     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 705         ret = nc->info->receive_raw(nc, buffer, offset);
 706     } else {
 707         ret = nc->info->receive(nc, buffer, offset);
 708     }
 709
 710     g_free(buf);
 711     return ret;
 712 }
 713
 714 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 715                                        unsigned flags,
 716                                        const struct iovec *iov,
 717                                        int iovcnt,
 718                                        void *opaque)
 719 {
 720     NetClientState *nc = opaque;
 721     int ret;
 722
 723
 724     if (nc->link_down) {
 725         return iov_size(iov, iovcnt);
 726     }
 727
 728     if (nc->receive_disabled) {
 729         return 0;
 730     }
 731
 732     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 733         ret = nc->info->receive_iov(nc, iov, iovcnt);
 734     } else {
 735         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 736     }
 737
 738     if (ret == 0) {
 739         nc->receive_disabled = 1;
 740     }
 741
 742     return ret;
 743 }
 744
 745 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 746                                 const struct iovec *iov, int iovcnt,
 747                                 NetPacketSent *sent_cb)
 748 {
 749     NetQueue *queue;
 750     size_t size = iov_size(iov, iovcnt);
 751     int ret;
 752
 753     if (size > NET_BUFSIZE) {
 754         return size;
 755     }
 756
 757     if (sender->link_down || !sender->peer) {
 758         return size;
 759     }
 760
 761     /* Let filters handle the packet first */
 762     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 763                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 764     if (ret) {
 765         return ret;
 766     }
 767
 768     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 769                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 770     if (ret) {
 771         return ret;
 772     }
 773
 774     queue = sender->peer->incoming_queue;
 775
 776     return qemu_net_queue_send_iov(queue, sender,
 777                                    QEMU_NET_PACKET_FLAG_NONE,
 778                                    iov, iovcnt, sent_cb);
 779 }
 780
 781 ssize_t
 782 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 783 {
 784     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 785 }
 786
 787 NetClientState *qemu_find_netdev(const char *id)
 788 {
 789     NetClientState *nc;
 790
 791     QTAILQ_FOREACH(nc, &net_clients, next) {
 792         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 793             continue;
 794         if (!strcmp(nc->name, id)) {
 795             return nc;
 796         }
 797     }
 798
 799     return NULL;
 800 }
 801
 802 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 803                                  NetClientDriver type, int max)
 804 {
 805     NetClientState *nc;
 806     int ret = 0;
 807
 808     QTAILQ_FOREACH(nc, &net_clients, next) {
 809         if (nc->info->type == type) {
 810             continue;
 811         }
 812         if (!id || !strcmp(nc->name, id)) {
 813             if (ret < max) {
 814                 ncs[ret] = nc;
 815             }
 816             ret++;
 817         }
 818     }
 819
 820     return ret;
 821 }
 822
 823 static int nic_get_free_idx(void)
 824 {
 825     int index;
 826
 827     for (index = 0; index < MAX_NICS; index++)
 828         if (!nd_table[index].used)
 829             return index;
 830     return -1;
 831 }
 832
 833 int qemu_show_nic_models(const char *arg, const char *const *models)
 834 {
 835     int i;
 836
 837     if (!arg || !is_help_option(arg)) {
 838         return 0;
 839     }
 840
 841     printf("Supported NIC models:\n");
 842     for (i = 0 ; models[i]; i++) {
 843         printf("%s\n", models[i]);
 844     }
 845     return 1;
 846 }
 847
 848 void qemu_check_nic_model(NICInfo *nd, const char *model)
 849 {
 850     const char *models[2];
 851
 852     models[0] = model;
 853     models[1] = NULL;
 854
 855     if (qemu_show_nic_models(nd->model, models))
 856         exit(0);
 857     if (qemu_find_nic_model(nd, models, model) < 0)
 858         exit(1);
 859 }
 860
 861 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 862                         const char *default_model)
 863 {
 864     int i;
 865
 866     if (!nd->model)
 867         nd->model = g_strdup(default_model);
 868
 869     for (i = 0 ; models[i]; i++) {
 870         if (strcmp(nd->model, models[i]) == 0)
 871             return i;
 872     }
 873
 874     error_report("Unsupported NIC model: %s", nd->model);
 875     return -1;
 876 }
 877
 878 static int net_init_nic(const Netdev *netdev, const char *name,
 879                         NetClientState *peer, Error **errp)
 880 {
 881     int idx;
 882     NICInfo *nd;
 883     const NetLegacyNicOptions *nic;
 884
 885     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 886     nic = &netdev->u.nic;
 887
 888     idx = nic_get_free_idx();
 889     if (idx == -1 || nb_nics >= MAX_NICS) {
 890         error_setg(errp, "too many NICs");
 891         return -1;
 892     }
 893
 894     nd = &nd_table[idx];
 895
 896     memset(nd, 0, sizeof(*nd));
 897
 898     if (nic->has_netdev) {
 899         nd->netdev = qemu_find_netdev(nic->netdev);
 900         if (!nd->netdev) {
 901             error_setg(errp, "netdev '%s' not found", nic->netdev);
 902             return -1;
 903         }
 904     } else {
 905         assert(peer);
 906         nd->netdev = peer;
 907     }
 908     nd->name = g_strdup(name);
 909     if (nic->has_model) {
 910         nd->model = g_strdup(nic->model);
 911     }
 912     if (nic->has_addr) {
 913         nd->devaddr = g_strdup(nic->addr);
 914     }
 915
 916     if (nic->has_macaddr &&
 917         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 918         error_setg(errp, "invalid syntax for ethernet address");
 919         return -1;
 920     }
 921     if (nic->has_macaddr &&
 922         is_multicast_ether_addr(nd->macaddr.a)) {
 923         error_setg(errp,
 924                    "NIC cannot have multicast MAC address (odd 1st byte)");
 925         return -1;
 926     }
 927     qemu_macaddr_default_if_unset(&nd->macaddr);
 928
 929     if (nic->has_vectors) {
 930         if (nic->vectors > 0x7ffffff) {
 931             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 932             return -1;
 933         }
 934         nd->nvectors = nic->vectors;
 935     } else {
 936         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 937     }
 938
 939     nd->used = 1;
 940     nb_nics++;
 941
 942     return idx;
 943 }
 944
 945
 946 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 947     const Netdev *netdev,
 948     const char *name,
 949     NetClientState *peer, Error **errp) = {
 950         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 951 #ifdef CONFIG_SLIRP
 952         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 953 #endif
 954         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 955         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 956 #ifdef CONFIG_VDE
 957         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 958 #endif
 959 #ifdef CONFIG_NETMAP
 960         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 961 #endif
 962 #ifdef CONFIG_NET_BRIDGE
 963         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 964 #endif
 965         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 966 #ifdef CONFIG_VHOST_NET_USER
 967         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 968 #endif
 969 #ifdef CONFIG_L2TPV3
 970         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 971 #endif
 972 };
 973
 974
 975 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 976 {
 977     Netdev legacy = {0};
 978     const Netdev *netdev;
 979     const char *name;
 980     NetClientState *peer = NULL;
 981
 982     if (is_netdev) {
 983         netdev = object;
 984         name = netdev->id;
 985
 986         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 987             !net_client_init_fun[netdev->type]) {
 988             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 989                        "a netdev backend type");
 990             return -1;
 991         }
 992     } else {
 993         const NetLegacy *net = object;
 994         const NetLegacyOptions *opts = net->opts;
 995         legacy.id = net->id;
 996         netdev = &legacy;
 997         /* missing optional values have been initialized to "all bits zero" */
 998         name = net->has_id ? net->id : net->name;
 999
1000         if (net->has_name) {
1001             warn_report("The 'name' parameter is deprecated, use 'id' instead");
1002         }
1003
1004         /* Map the old options to the new flat type */
1005         switch (opts->type) {
1006         case NET_LEGACY_OPTIONS_TYPE_NONE:
1007             return 0; /* nothing to do */
1008         case NET_LEGACY_OPTIONS_TYPE_NIC:
1009             legacy.type = NET_CLIENT_DRIVER_NIC;
1010             legacy.u.nic = opts->u.nic;
1011             break;
1012         case NET_LEGACY_OPTIONS_TYPE_USER:
1013             legacy.type = NET_CLIENT_DRIVER_USER;
1014             legacy.u.user = opts->u.user;
1015             break;
1016         case NET_LEGACY_OPTIONS_TYPE_TAP:
1017             legacy.type = NET_CLIENT_DRIVER_TAP;
1018             legacy.u.tap = opts->u.tap;
1019             break;
1020         case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1021             legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1022             legacy.u.l2tpv3 = opts->u.l2tpv3;
1023             break;
1024         case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1025             legacy.type = NET_CLIENT_DRIVER_SOCKET;
1026             legacy.u.socket = opts->u.socket;
1027             break;
1028         case NET_LEGACY_OPTIONS_TYPE_VDE:
1029             legacy.type = NET_CLIENT_DRIVER_VDE;
1030             legacy.u.vde = opts->u.vde;
1031             break;
1032         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1033             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1034             legacy.u.bridge = opts->u.bridge;
1035             break;
1036         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1037             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1038             legacy.u.netmap = opts->u.netmap;
1039             break;
1040         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1041             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1042             legacy.u.vhost_user = opts->u.vhost_user;
1043             break;
1044         default:
1045             abort();
1046         }
1047
1048         if (!net_client_init_fun[netdev->type]) {
1049             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1050                        "a net backend type (maybe it is not compiled "
1051                        "into this binary)");
1052             return -1;
1053         }
1054
1055         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1056         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1057             !opts->u.nic.has_netdev) {
1058             peer = net_hub_add_port(0, NULL, NULL);
1059         }
1060     }
1061
1062     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1063         /* FIXME drop when all init functions store an Error */
1064         if (errp && !*errp) {
1065             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1066                        NetClientDriver_str(netdev->type));
1067         }
1068         return -1;
1069     }
1070     return 0;
1071 }
1072
1073 static void show_netdevs(void)
1074 {
1075     int idx;
1076     const char *available_netdevs[] = {
1077         "socket",
1078         "hubport",
1079         "tap",
1080 #ifdef CONFIG_SLIRP
1081         "user",
1082 #endif
1083 #ifdef CONFIG_L2TPV3
1084         "l2tpv3",
1085 #endif
1086 #ifdef CONFIG_VDE
1087         "vde",
1088 #endif
1089 #ifdef CONFIG_NET_BRIDGE
1090         "bridge",
1091 #endif
1092 #ifdef CONFIG_NETMAP
1093         "netmap",
1094 #endif
1095 #ifdef CONFIG_POSIX
1096         "vhost-user",
1097 #endif
1098     };
1099
1100     printf("Available netdev backend types:\n");
1101     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1102         puts(available_netdevs[idx]);
1103     }
1104 }
1105
1106 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1107 {
1108     void *object = NULL;
1109     Error *err = NULL;
1110     int ret = -1;
1111     Visitor *v = opts_visitor_new(opts);
1112
1113     const char *type = qemu_opt_get(opts, "type");
1114
1115     if (is_netdev && type && is_help_option(type)) {
1116         show_netdevs();
1117         exit(0);
1118     } else {
1119         /* Parse convenience option format ip6-net=fec0::0[/64] */
1120         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1121
1122         if (ip6_net) {
1123             char buf[strlen(ip6_net) + 1];
1124
1125             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1126                 /* Default 64bit prefix length.  */
1127                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1128                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1129             } else {
1130                 /* User-specified prefix length.  */
1131                 unsigned long len;
1132                 int err;
1133
1134                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1135                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1136
1137                 if (err) {
1138                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1139                               "ipv6-prefix", "a number");
1140                 } else {
1141                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1142                                         &error_abort);
1143                 }
1144             }
1145             qemu_opt_unset(opts, "ipv6-net");
1146         }
1147     }
1148
1149     if (is_netdev) {
1150         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1151     } else {
1152         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1153     }
1154
1155     if (!err) {
1156         ret = net_client_init1(object, is_netdev, &err);
1157     }
1158
1159     if (is_netdev) {
1160         qapi_free_Netdev(object);
1161     } else {
1162         qapi_free_NetLegacy(object);
1163     }
1164
1165     error_propagate(errp, err);
1166     visit_free(v);
1167     return ret;
1168 }
1169
1170 void netdev_add(QemuOpts *opts, Error **errp)
1171 {
1172     net_client_init(opts, true, errp);
1173 }
1174
1175 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1176 {
1177     Error *local_err = NULL;
1178     QemuOptsList *opts_list;
1179     QemuOpts *opts;
1180
1181     opts_list = qemu_find_opts_err("netdev", &local_err);
1182     if (local_err) {
1183         goto out;
1184     }
1185
1186     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1187     if (local_err) {
1188         goto out;
1189     }
1190
1191     netdev_add(opts, &local_err);
1192     if (local_err) {
1193         qemu_opts_del(opts);
1194         goto out;
1195     }
1196
1197 out:
1198     error_propagate(errp, local_err);
1199 }
1200
1201 void qmp_netdev_del(const char *id, Error **errp)
1202 {
1203     NetClientState *nc;
1204     QemuOpts *opts;
1205
1206     nc = qemu_find_netdev(id);
1207     if (!nc) {
1208         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1209                   "Device '%s' not found", id);
1210         return;
1211     }
1212
1213     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1214     if (!opts) {
1215         error_setg(errp, "Device '%s' is not a netdev", id);
1216         return;
1217     }
1218
1219     qemu_del_net_client(nc);
1220     qemu_opts_del(opts);
1221 }
1222
1223 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1224 {
1225     char *str;
1226     ObjectProperty *prop;
1227     ObjectPropertyIterator iter;
1228     Visitor *v;
1229
1230     /* generate info str */
1231     object_property_iter_init(&iter, OBJECT(nf));
1232     while ((prop = object_property_iter_next(&iter))) {
1233         if (!strcmp(prop->name, "type")) {
1234             continue;
1235         }
1236         v = string_output_visitor_new(false, &str);
1237         object_property_get(OBJECT(nf), v, prop->name, NULL);
1238         visit_complete(v, &str);
1239         visit_free(v);
1240         monitor_printf(mon, ",%s=%s", prop->name, str);
1241         g_free(str);
1242     }
1243     monitor_printf(mon, "\n");
1244 }
1245
1246 void print_net_client(Monitor *mon, NetClientState *nc)
1247 {
1248     NetFilterState *nf;
1249
1250     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1251                    nc->queue_index,
1252                    NetClientDriver_str(nc->info->type),
1253                    nc->info_str);
1254     if (!QTAILQ_EMPTY(&nc->filters)) {
1255         monitor_printf(mon, "filters:\n");
1256     }
1257     QTAILQ_FOREACH(nf, &nc->filters, next) {
1258         char *path = object_get_canonical_path_component(OBJECT(nf));
1259
1260         monitor_printf(mon, "  - %s: type=%s", path,
1261                        object_get_typename(OBJECT(nf)));
1262         netfilter_print_info(mon, nf);
1263         g_free(path);
1264     }
1265 }
1266
1267 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1268                                       Error **errp)
1269 {
1270     NetClientState *nc;
1271     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1272
1273     QTAILQ_FOREACH(nc, &net_clients, next) {
1274         RxFilterInfoList *entry;
1275         RxFilterInfo *info;
1276
1277         if (has_name && strcmp(nc->name, name) != 0) {
1278             continue;
1279         }
1280
1281         /* only query rx-filter information of NIC */
1282         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1283             if (has_name) {
1284                 error_setg(errp, "net client(%s) isn't a NIC", name);
1285                 return NULL;
1286             }
1287             continue;
1288         }
1289
1290         /* only query information on queue 0 since the info is per nic,
1291          * not per queue
1292          */
1293         if (nc->queue_index != 0)
1294             continue;
1295
1296         if (nc->info->query_rx_filter) {
1297             info = nc->info->query_rx_filter(nc);
1298             entry = g_malloc0(sizeof(*entry));
1299             entry->value = info;
1300
1301             if (!filter_list) {
1302                 filter_list = entry;
1303             } else {
1304                 last_entry->next = entry;
1305             }
1306             last_entry = entry;
1307         } else if (has_name) {
1308             error_setg(errp, "net client(%s) doesn't support"
1309                        " rx-filter querying", name);
1310             return NULL;
1311         }
1312
1313         if (has_name) {
1314             break;
1315         }
1316     }
1317
1318     if (filter_list == NULL && has_name) {
1319         error_setg(errp, "invalid net client name: %s", name);
1320     }
1321
1322     return filter_list;
1323 }
1324
1325 void hmp_info_network(Monitor *mon, const QDict *qdict)
1326 {
1327     NetClientState *nc, *peer;
1328     NetClientDriver type;
1329
1330     net_hub_info(mon);
1331
1332     QTAILQ_FOREACH(nc, &net_clients, next) {
1333         peer = nc->peer;
1334         type = nc->info->type;
1335
1336         /* Skip if already printed in hub info */
1337         if (net_hub_id_for_client(nc, NULL) == 0) {
1338             continue;
1339         }
1340
1341         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1342             print_net_client(mon, nc);
1343         } /* else it's a netdev connected to a NIC, printed with the NIC */
1344         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1345             monitor_printf(mon, " \\ ");
1346             print_net_client(mon, peer);
1347         }
1348     }
1349 }
1350
1351 void colo_notify_filters_event(int event, Error **errp)
1352 {
1353     NetClientState *nc;
1354     NetFilterState *nf;
1355     NetFilterClass *nfc = NULL;
1356     Error *local_err = NULL;
1357
1358     QTAILQ_FOREACH(nc, &net_clients, next) {
1359         QTAILQ_FOREACH(nf, &nc->filters, next) {
1360             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1361             nfc->handle_event(nf, event, &local_err);
1362             if (local_err) {
1363                 error_propagate(errp, local_err);
1364                 return;
1365             }
1366         }
1367     }
1368 }
1369
1370 void qmp_set_link(const char *name, bool up, Error **errp)
1371 {
1372     NetClientState *ncs[MAX_QUEUE_NUM];
1373     NetClientState *nc;
1374     int queues, i;
1375
1376     queues = qemu_find_net_clients_except(name, ncs,
1377                                           NET_CLIENT_DRIVER__MAX,
1378                                           MAX_QUEUE_NUM);
1379
1380     if (queues == 0) {
1381         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1382                   "Device '%s' not found", name);
1383         return;
1384     }
1385     nc = ncs[0];
1386
1387     for (i = 0; i < queues; i++) {
1388         ncs[i]->link_down = !up;
1389     }
1390
1391     if (nc->info->link_status_changed) {
1392         nc->info->link_status_changed(nc);
1393     }
1394
1395     if (nc->peer) {
1396         /* Change peer link only if the peer is NIC and then notify peer.
1397          * If the peer is a HUBPORT or a backend, we do not change the
1398          * link status.
1399          *
1400          * This behavior is compatible with qemu hubs where there could be
1401          * multiple clients that can still communicate with each other in
1402          * disconnected mode. For now maintain this compatibility.
1403          */
1404         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1405             for (i = 0; i < queues; i++) {
1406                 ncs[i]->peer->link_down = !up;
1407             }
1408         }
1409         if (nc->peer->info->link_status_changed) {
1410             nc->peer->info->link_status_changed(nc->peer);
1411         }
1412     }
1413 }
1414
1415 static void net_vm_change_state_handler(void *opaque, int running,
1416                                         RunState state)
1417 {
1418     NetClientState *nc;
1419     NetClientState *tmp;
1420
1421     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1422         if (running) {
1423             /* Flush queued packets and wake up backends. */
1424             if (nc->peer && qemu_can_send_packet(nc)) {
1425                 qemu_flush_queued_packets(nc->peer);
1426             }
1427         } else {
1428             /* Complete all queued packets, to guarantee we don't modify
1429              * state later when VM is not running.
1430              */
1431             qemu_flush_or_purge_queued_packets(nc, true);
1432         }
1433     }
1434 }
1435
1436 void net_cleanup(void)
1437 {
1438     NetClientState *nc;
1439
1440     /* We may del multiple entries during qemu_del_net_client(),
1441      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1442      */
1443     while (!QTAILQ_EMPTY(&net_clients)) {
1444         nc = QTAILQ_FIRST(&net_clients);
1445         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1446             qemu_del_nic(qemu_get_nic(nc));
1447         } else {
1448             qemu_del_net_client(nc);
1449         }
1450     }
1451
1452     qemu_del_vm_change_state_handler(net_change_state_entry);
1453 }
1454
1455 void net_check_clients(void)
1456 {
1457     NetClientState *nc;
1458     int i;
1459
1460     net_hub_check_clients();
1461
1462     QTAILQ_FOREACH(nc, &net_clients, next) {
1463         if (!nc->peer) {
1464             warn_report("%s %s has no peer",
1465                         nc->info->type == NET_CLIENT_DRIVER_NIC
1466                         ? "nic" : "netdev",
1467                         nc->name);
1468         }
1469     }
1470
1471     /* Check that all NICs requested via -net nic actually got created.
1472      * NICs created via -device don't need to be checked here because
1473      * they are always instantiated.
1474      */
1475     for (i = 0; i < MAX_NICS; i++) {
1476         NICInfo *nd = &nd_table[i];
1477         if (nd->used && !nd->instantiated) {
1478             warn_report("requested NIC (%s, model %s) "
1479                         "was not created (not supported by this machine?)",
1480                         nd->name ? nd->name : "anonymous",
1481                         nd->model ? nd->model : "unspecified");
1482         }
1483     }
1484 }
1485
1486 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1487 {
1488     return net_client_init(opts, false, errp);
1489 }
1490
1491 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1492 {
1493     return net_client_init(opts, true, errp);
1494 }
1495
1496 /* For the convenience "--nic" parameter */
1497 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1498 {
1499     char *mac, *nd_id;
1500     int idx, ret;
1501     NICInfo *ni;
1502     const char *type;
1503
1504     type = qemu_opt_get(opts, "type");
1505     if (type && g_str_equal(type, "none")) {
1506         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1507     }
1508
1509     idx = nic_get_free_idx();
1510     if (idx == -1 || nb_nics >= MAX_NICS) {
1511         error_setg(errp, "no more on-board/default NIC slots available");
1512         return -1;
1513     }
1514
1515     if (!type) {
1516         qemu_opt_set(opts, "type", "user", &error_abort);
1517     }
1518
1519     ni = &nd_table[idx];
1520     memset(ni, 0, sizeof(*ni));
1521     ni->model = qemu_opt_get_del(opts, "model");
1522
1523     /* Create an ID if the user did not specify one */
1524     nd_id = g_strdup(qemu_opts_id(opts));
1525     if (!nd_id) {
1526         nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1527         qemu_opts_set_id(opts, nd_id);
1528     }
1529
1530     /* Handle MAC address */
1531     mac = qemu_opt_get_del(opts, "mac");
1532     if (mac) {
1533         ret = net_parse_macaddr(ni->macaddr.a, mac);
1534         g_free(mac);
1535         if (ret) {
1536             error_setg(errp, "invalid syntax for ethernet address");
1537             goto out;
1538         }
1539         if (is_multicast_ether_addr(ni->macaddr.a)) {
1540             error_setg(errp, "NIC cannot have multicast MAC address");
1541             ret = -1;
1542             goto out;
1543         }
1544     }
1545     qemu_macaddr_default_if_unset(&ni->macaddr);
1546
1547     ret = net_client_init(opts, true, errp);
1548     if (ret == 0) {
1549         ni->netdev = qemu_find_netdev(nd_id);
1550         ni->used = true;
1551         nb_nics++;
1552     }
1553
1554 out:
1555     g_free(nd_id);
1556     return ret;
1557 }
1558
1559 int net_init_clients(Error **errp)
1560 {
1561     net_change_state_entry =
1562         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1563
1564     QTAILQ_INIT(&net_clients);
1565
1566     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1567                           net_init_netdev, NULL, errp)) {
1568         return -1;
1569     }
1570
1571     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1572         return -1;
1573     }
1574
1575     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1576         return -1;
1577     }
1578
1579     return 0;
1580 }
1581
1582 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1583 {
1584     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1585         return -1;
1586     }
1587
1588     return 0;
1589 }
1590
1591 /* From FreeBSD */
1592 /* XXX: optimize */
1593 uint32_t net_crc32(const uint8_t *p, int len)
1594 {
1595     uint32_t crc;
1596     int carry, i, j;
1597     uint8_t b;
1598
1599     crc = 0xffffffff;
1600     for (i = 0; i < len; i++) {
1601         b = *p++;
1602         for (j = 0; j < 8; j++) {
1603             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1604             crc <<= 1;
1605             b >>= 1;
1606             if (carry) {
1607                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1608             }
1609         }
1610     }
1611
1612     return crc;
1613 }
1614
1615 uint32_t net_crc32_le(const uint8_t *p, int len)
1616 {
1617     uint32_t crc;
1618     int carry, i, j;
1619     uint8_t b;
1620
1621     crc = 0xffffffff;
1622     for (i = 0; i < len; i++) {
1623         b = *p++;
1624         for (j = 0; j < 8; j++) {
1625             carry = (crc & 0x1) ^ (b & 0x01);
1626             crc >>= 1;
1627             b >>= 1;
1628             if (carry) {
1629                 crc ^= POLYNOMIAL_LE;
1630             }
1631         }
1632     }
1633
1634     return crc;
1635 }
1636
1637 QemuOptsList qemu_netdev_opts = {
1638     .name = "netdev",
1639     .implied_opt_name = "type",
1640     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1641     .desc = {
1642         /*
1643          * no elements => accept any params
1644          * validation will happen later
1645          */
1646         { /* end of list */ }
1647     },
1648 };
1649
1650 QemuOptsList qemu_nic_opts = {
1651     .name = "nic",
1652     .implied_opt_name = "type",
1653     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1654     .desc = {
1655         /*
1656          * no elements => accept any params
1657          * validation will happen later
1658          */
1659         { /* end of list */ }
1660     },
1661 };
1662
1663 QemuOptsList qemu_net_opts = {
1664     .name = "net",
1665     .implied_opt_name = "type",
1666     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1667     .desc = {
1668         /*
1669          * no elements => accept any params
1670          * validation will happen later
1671          */
1672         { /* end of list */ }
1673     },
1674 };
1675
1676 void net_socket_rs_init(SocketReadState *rs,
1677                         SocketReadStateFinalize *finalize,
1678                         bool vnet_hdr)
1679 {
1680     rs->state = 0;
1681     rs->vnet_hdr = vnet_hdr;
1682     rs->index = 0;
1683     rs->packet_len = 0;
1684     rs->vnet_hdr_len = 0;
1685     memset(rs->buf, 0, sizeof(rs->buf));
1686     rs->finalize = finalize;
1687 }
1688
1689 /*
1690  * Returns
1691  * 0: success
1692  * -1: error occurs
1693  */
1694 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1695 {
1696     unsigned int l;
1697
1698     while (size > 0) {
1699         /* Reassemble a packet from the network.
1700          * 0 = getting length.
1701          * 1 = getting vnet header length.
1702          * 2 = getting data.
1703          */
1704         switch (rs->state) {
1705         case 0:
1706             l = 4 - rs->index;
1707             if (l > size) {
1708                 l = size;
1709             }
1710             memcpy(rs->buf + rs->index, buf, l);
1711             buf += l;
1712             size -= l;
1713             rs->index += l;
1714             if (rs->index == 4) {
1715                 /* got length */
1716                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1717                 rs->index = 0;
1718                 if (rs->vnet_hdr) {
1719                     rs->state = 1;
1720                 } else {
1721                     rs->state = 2;
1722                     rs->vnet_hdr_len = 0;
1723                 }
1724             }
1725             break;
1726         case 1:
1727             l = 4 - rs->index;
1728             if (l > size) {
1729                 l = size;
1730             }
1731             memcpy(rs->buf + rs->index, buf, l);
1732             buf += l;
1733             size -= l;
1734             rs->index += l;
1735             if (rs->index == 4) {
1736                 /* got vnet header length */
1737                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1738                 rs->index = 0;
1739                 rs->state = 2;
1740             }
1741             break;
1742         case 2:
1743             l = rs->packet_len - rs->index;
1744             if (l > size) {
1745                 l = size;
1746             }
1747             if (rs->index + l <= sizeof(rs->buf)) {
1748                 memcpy(rs->buf + rs->index, buf, l);
1749             } else {
1750                 fprintf(stderr, "serious error: oversized packet received,"
1751                     "connection terminated.\n");
1752                 rs->index = rs->state = 0;
1753                 return -1;
1754             }
1755
1756             rs->index += l;
1757             buf += l;
1758             size -= l;
1759             if (rs->index >= rs->packet_len) {
1760                 rs->index = 0;
1761                 rs->state = 0;
1762                 assert(rs->finalize);
1763                 rs->finalize(rs);
1764             }
1765             break;
1766         }
1767     }
1768
1769     assert(size == 0);
1770     return 0;
1771 }