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/qmp/qdict.h"
  37 #include "qapi/qmp/qerror.h"
  38 #include "qemu/error-report.h"
  39 #include "qemu/sockets.h"
  40 #include "qemu/cutils.h"
  41 #include "qemu/config-file.h"
  42 #include "qmp-commands.h"
  43 #include "hw/qdev.h"
  44 #include "qemu/iov.h"
  45 #include "qemu/main-loop.h"
  46 #include "qemu/option.h"
  47 #include "qapi-visit.h"
  48 #include "qapi/error.h"
  49 #include "qapi/opts-visitor.h"
  50 #include "sysemu/sysemu.h"
  51 #include "sysemu/qtest.h"
  52 #include "net/filter.h"
  53 #include "qapi/string-output-visitor.h"
  54
  55 /* Net bridge is currently not supported for W32. */
  56 #if !defined(_WIN32)
  57 # define CONFIG_NET_BRIDGE
  58 #endif
  59
  60 static VMChangeStateEntry *net_change_state_entry;
  61 static QTAILQ_HEAD(, NetClientState) net_clients;
  62
  63 const char *host_net_devices[] = {
  64     "tap",
  65     "socket",
  66 #ifdef CONFIG_NET_BRIDGE
  67     "bridge",
  68 #endif
  69 #ifdef CONFIG_NETMAP
  70     "netmap",
  71 #endif
  72 #ifdef CONFIG_SLIRP
  73     "user",
  74 #endif
  75 #ifdef CONFIG_VDE
  76     "vde",
  77 #endif
  78     "vhost-user",
  79     NULL,
  80 };
  81
  82 /***********************************************************/
  83 /* network device redirectors */
  84
  85 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  86 {
  87     const char *p, *p1;
  88     int len;
  89     p = *pp;
  90     p1 = strchr(p, sep);
  91     if (!p1)
  92         return -1;
  93     len = p1 - p;
  94     p1++;
  95     if (buf_size > 0) {
  96         if (len > buf_size - 1)
  97             len = buf_size - 1;
  98         memcpy(buf, p, len);
  99         buf[len] = '\0';
 100     }
 101     *pp = p1;
 102     return 0;
 103 }
 104
 105 int parse_host_port(struct sockaddr_in *saddr, const char *str,
 106                     Error **errp)
 107 {
 108     char buf[512];
 109     struct hostent *he;
 110     const char *p, *r;
 111     int port;
 112
 113     p = str;
 114     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 115         error_setg(errp, "host address '%s' doesn't contain ':' "
 116                    "separating host from port", str);
 117         return -1;
 118     }
 119     saddr->sin_family = AF_INET;
 120     if (buf[0] == '\0') {
 121         saddr->sin_addr.s_addr = 0;
 122     } else {
 123         if (qemu_isdigit(buf[0])) {
 124             if (!inet_aton(buf, &saddr->sin_addr)) {
 125                 error_setg(errp, "host address '%s' is not a valid "
 126                            "IPv4 address", buf);
 127                 return -1;
 128             }
 129         } else {
 130             he = gethostbyname(buf);
 131             if (he == NULL) {
 132                 error_setg(errp, "can't resolve host address '%s'", buf);
 133                 return - 1;
 134             }
 135             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 136         }
 137     }
 138     port = strtol(p, (char **)&r, 0);
 139     if (r == p) {
 140         error_setg(errp, "port number '%s' is invalid", p);
 141         return -1;
 142     }
 143     saddr->sin_port = htons(port);
 144     return 0;
 145 }
 146
 147 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 148 {
 149     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 150                            macaddr[0], macaddr[1], macaddr[2],
 151                            macaddr[3], macaddr[4], macaddr[5]);
 152 }
 153
 154 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 155 {
 156     snprintf(nc->info_str, sizeof(nc->info_str),
 157              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 158              nc->model,
 159              macaddr[0], macaddr[1], macaddr[2],
 160              macaddr[3], macaddr[4], macaddr[5]);
 161 }
 162
 163 static int mac_table[256] = {0};
 164
 165 static void qemu_macaddr_set_used(MACAddr *macaddr)
 166 {
 167     int index;
 168
 169     for (index = 0x56; index < 0xFF; index++) {
 170         if (macaddr->a[5] == index) {
 171             mac_table[index]++;
 172         }
 173     }
 174 }
 175
 176 static void qemu_macaddr_set_free(MACAddr *macaddr)
 177 {
 178     int index;
 179     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 180
 181     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 182         return;
 183     }
 184     for (index = 0x56; index < 0xFF; index++) {
 185         if (macaddr->a[5] == index) {
 186             mac_table[index]--;
 187         }
 188     }
 189 }
 190
 191 static int qemu_macaddr_get_free(void)
 192 {
 193     int index;
 194
 195     for (index = 0x56; index < 0xFF; index++) {
 196         if (mac_table[index] == 0) {
 197             return index;
 198         }
 199     }
 200
 201     return -1;
 202 }
 203
 204 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 205 {
 206     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 207     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 208
 209     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 210         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 211             return;
 212         } else {
 213             qemu_macaddr_set_used(macaddr);
 214             return;
 215         }
 216     }
 217
 218     macaddr->a[0] = 0x52;
 219     macaddr->a[1] = 0x54;
 220     macaddr->a[2] = 0x00;
 221     macaddr->a[3] = 0x12;
 222     macaddr->a[4] = 0x34;
 223     macaddr->a[5] = qemu_macaddr_get_free();
 224     qemu_macaddr_set_used(macaddr);
 225 }
 226
 227 /**
 228  * Generate a name for net client
 229  *
 230  * Only net clients created with the legacy -net option and NICs need this.
 231  */
 232 static char *assign_name(NetClientState *nc1, const char *model)
 233 {
 234     NetClientState *nc;
 235     int id = 0;
 236
 237     QTAILQ_FOREACH(nc, &net_clients, next) {
 238         if (nc == nc1) {
 239             continue;
 240         }
 241         if (strcmp(nc->model, model) == 0) {
 242             id++;
 243         }
 244     }
 245
 246     return g_strdup_printf("%s.%d", model, id);
 247 }
 248
 249 static void qemu_net_client_destructor(NetClientState *nc)
 250 {
 251     g_free(nc);
 252 }
 253
 254 static void qemu_net_client_setup(NetClientState *nc,
 255                                   NetClientInfo *info,
 256                                   NetClientState *peer,
 257                                   const char *model,
 258                                   const char *name,
 259                                   NetClientDestructor *destructor)
 260 {
 261     nc->info = info;
 262     nc->model = g_strdup(model);
 263     if (name) {
 264         nc->name = g_strdup(name);
 265     } else {
 266         nc->name = assign_name(nc, model);
 267     }
 268
 269     if (peer) {
 270         assert(!peer->peer);
 271         nc->peer = peer;
 272         peer->peer = nc;
 273     }
 274     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 275
 276     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 277     nc->destructor = destructor;
 278     QTAILQ_INIT(&nc->filters);
 279 }
 280
 281 NetClientState *qemu_new_net_client(NetClientInfo *info,
 282                                     NetClientState *peer,
 283                                     const char *model,
 284                                     const char *name)
 285 {
 286     NetClientState *nc;
 287
 288     assert(info->size >= sizeof(NetClientState));
 289
 290     nc = g_malloc0(info->size);
 291     qemu_net_client_setup(nc, info, peer, model, name,
 292                           qemu_net_client_destructor);
 293
 294     return nc;
 295 }
 296
 297 NICState *qemu_new_nic(NetClientInfo *info,
 298                        NICConf *conf,
 299                        const char *model,
 300                        const char *name,
 301                        void *opaque)
 302 {
 303     NetClientState **peers = conf->peers.ncs;
 304     NICState *nic;
 305     int i, queues = MAX(1, conf->peers.queues);
 306
 307     assert(info->type == NET_CLIENT_DRIVER_NIC);
 308     assert(info->size >= sizeof(NICState));
 309
 310     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 311     nic->ncs = (void *)nic + info->size;
 312     nic->conf = conf;
 313     nic->opaque = opaque;
 314
 315     for (i = 0; i < queues; i++) {
 316         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 317                               NULL);
 318         nic->ncs[i].queue_index = i;
 319     }
 320
 321     return nic;
 322 }
 323
 324 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 325 {
 326     return nic->ncs + queue_index;
 327 }
 328
 329 NetClientState *qemu_get_queue(NICState *nic)
 330 {
 331     return qemu_get_subqueue(nic, 0);
 332 }
 333
 334 NICState *qemu_get_nic(NetClientState *nc)
 335 {
 336     NetClientState *nc0 = nc - nc->queue_index;
 337
 338     return (NICState *)((void *)nc0 - nc->info->size);
 339 }
 340
 341 void *qemu_get_nic_opaque(NetClientState *nc)
 342 {
 343     NICState *nic = qemu_get_nic(nc);
 344
 345     return nic->opaque;
 346 }
 347
 348 static void qemu_cleanup_net_client(NetClientState *nc)
 349 {
 350     QTAILQ_REMOVE(&net_clients, nc, next);
 351
 352     if (nc->info->cleanup) {
 353         nc->info->cleanup(nc);
 354     }
 355 }
 356
 357 static void qemu_free_net_client(NetClientState *nc)
 358 {
 359     if (nc->incoming_queue) {
 360         qemu_del_net_queue(nc->incoming_queue);
 361     }
 362     if (nc->peer) {
 363         nc->peer->peer = NULL;
 364     }
 365     g_free(nc->name);
 366     g_free(nc->model);
 367     if (nc->destructor) {
 368         nc->destructor(nc);
 369     }
 370 }
 371
 372 void qemu_del_net_client(NetClientState *nc)
 373 {
 374     NetClientState *ncs[MAX_QUEUE_NUM];
 375     int queues, i;
 376     NetFilterState *nf, *next;
 377
 378     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 379
 380     /* If the NetClientState belongs to a multiqueue backend, we will change all
 381      * other NetClientStates also.
 382      */
 383     queues = qemu_find_net_clients_except(nc->name, ncs,
 384                                           NET_CLIENT_DRIVER_NIC,
 385                                           MAX_QUEUE_NUM);
 386     assert(queues != 0);
 387
 388     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 389         object_unparent(OBJECT(nf));
 390     }
 391
 392     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 393     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 394         NICState *nic = qemu_get_nic(nc->peer);
 395         if (nic->peer_deleted) {
 396             return;
 397         }
 398         nic->peer_deleted = true;
 399
 400         for (i = 0; i < queues; i++) {
 401             ncs[i]->peer->link_down = true;
 402         }
 403
 404         if (nc->peer->info->link_status_changed) {
 405             nc->peer->info->link_status_changed(nc->peer);
 406         }
 407
 408         for (i = 0; i < queues; i++) {
 409             qemu_cleanup_net_client(ncs[i]);
 410         }
 411
 412         return;
 413     }
 414
 415     for (i = 0; i < queues; i++) {
 416         qemu_cleanup_net_client(ncs[i]);
 417         qemu_free_net_client(ncs[i]);
 418     }
 419 }
 420
 421 void qemu_del_nic(NICState *nic)
 422 {
 423     int i, queues = MAX(nic->conf->peers.queues, 1);
 424
 425     qemu_macaddr_set_free(&nic->conf->macaddr);
 426
 427     /* If this is a peer NIC and peer has already been deleted, free it now. */
 428     if (nic->peer_deleted) {
 429         for (i = 0; i < queues; i++) {
 430             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 431         }
 432     }
 433
 434     for (i = queues - 1; i >= 0; i--) {
 435         NetClientState *nc = qemu_get_subqueue(nic, i);
 436
 437         qemu_cleanup_net_client(nc);
 438         qemu_free_net_client(nc);
 439     }
 440
 441     g_free(nic);
 442 }
 443
 444 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 445 {
 446     NetClientState *nc;
 447
 448     QTAILQ_FOREACH(nc, &net_clients, next) {
 449         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 450             if (nc->queue_index == 0) {
 451                 func(qemu_get_nic(nc), opaque);
 452             }
 453         }
 454     }
 455 }
 456
 457 bool qemu_has_ufo(NetClientState *nc)
 458 {
 459     if (!nc || !nc->info->has_ufo) {
 460         return false;
 461     }
 462
 463     return nc->info->has_ufo(nc);
 464 }
 465
 466 bool qemu_has_vnet_hdr(NetClientState *nc)
 467 {
 468     if (!nc || !nc->info->has_vnet_hdr) {
 469         return false;
 470     }
 471
 472     return nc->info->has_vnet_hdr(nc);
 473 }
 474
 475 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 476 {
 477     if (!nc || !nc->info->has_vnet_hdr_len) {
 478         return false;
 479     }
 480
 481     return nc->info->has_vnet_hdr_len(nc, len);
 482 }
 483
 484 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 485 {
 486     if (!nc || !nc->info->using_vnet_hdr) {
 487         return;
 488     }
 489
 490     nc->info->using_vnet_hdr(nc, enable);
 491 }
 492
 493 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 494                           int ecn, int ufo)
 495 {
 496     if (!nc || !nc->info->set_offload) {
 497         return;
 498     }
 499
 500     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 501 }
 502
 503 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 504 {
 505     if (!nc || !nc->info->set_vnet_hdr_len) {
 506         return;
 507     }
 508
 509     nc->vnet_hdr_len = len;
 510     nc->info->set_vnet_hdr_len(nc, len);
 511 }
 512
 513 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 514 {
 515 #ifdef HOST_WORDS_BIGENDIAN
 516     if (!nc || !nc->info->set_vnet_le) {
 517         return -ENOSYS;
 518     }
 519
 520     return nc->info->set_vnet_le(nc, is_le);
 521 #else
 522     return 0;
 523 #endif
 524 }
 525
 526 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 527 {
 528 #ifdef HOST_WORDS_BIGENDIAN
 529     return 0;
 530 #else
 531     if (!nc || !nc->info->set_vnet_be) {
 532         return -ENOSYS;
 533     }
 534
 535     return nc->info->set_vnet_be(nc, is_be);
 536 #endif
 537 }
 538
 539 int qemu_can_send_packet(NetClientState *sender)
 540 {
 541     int vm_running = runstate_is_running();
 542
 543     if (!vm_running) {
 544         return 0;
 545     }
 546
 547     if (!sender->peer) {
 548         return 1;
 549     }
 550
 551     if (sender->peer->receive_disabled) {
 552         return 0;
 553     } else if (sender->peer->info->can_receive &&
 554                !sender->peer->info->can_receive(sender->peer)) {
 555         return 0;
 556     }
 557     return 1;
 558 }
 559
 560 static ssize_t filter_receive_iov(NetClientState *nc,
 561                                   NetFilterDirection direction,
 562                                   NetClientState *sender,
 563                                   unsigned flags,
 564                                   const struct iovec *iov,
 565                                   int iovcnt,
 566                                   NetPacketSent *sent_cb)
 567 {
 568     ssize_t ret = 0;
 569     NetFilterState *nf = NULL;
 570
 571     if (direction == NET_FILTER_DIRECTION_TX) {
 572         QTAILQ_FOREACH(nf, &nc->filters, next) {
 573             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 574                                          iovcnt, sent_cb);
 575             if (ret) {
 576                 return ret;
 577             }
 578         }
 579     } else {
 580         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
 581             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 582                                          iovcnt, sent_cb);
 583             if (ret) {
 584                 return ret;
 585             }
 586         }
 587     }
 588
 589     return ret;
 590 }
 591
 592 static ssize_t filter_receive(NetClientState *nc,
 593                               NetFilterDirection direction,
 594                               NetClientState *sender,
 595                               unsigned flags,
 596                               const uint8_t *data,
 597                               size_t size,
 598                               NetPacketSent *sent_cb)
 599 {
 600     struct iovec iov = {
 601         .iov_base = (void *)data,
 602         .iov_len = size
 603     };
 604
 605     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 606 }
 607
 608 void qemu_purge_queued_packets(NetClientState *nc)
 609 {
 610     if (!nc->peer) {
 611         return;
 612     }
 613
 614     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 615 }
 616
 617 static
 618 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 619 {
 620     nc->receive_disabled = 0;
 621
 622     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 623         if (net_hub_flush(nc->peer)) {
 624             qemu_notify_event();
 625         }
 626     }
 627     if (qemu_net_queue_flush(nc->incoming_queue)) {
 628         /* We emptied the queue successfully, signal to the IO thread to repoll
 629          * the file descriptor (for tap, for example).
 630          */
 631         qemu_notify_event();
 632     } else if (purge) {
 633         /* Unable to empty the queue, purge remaining packets */
 634         qemu_net_queue_purge(nc->incoming_queue, nc);
 635     }
 636 }
 637
 638 void qemu_flush_queued_packets(NetClientState *nc)
 639 {
 640     qemu_flush_or_purge_queued_packets(nc, false);
 641 }
 642
 643 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 644                                                  unsigned flags,
 645                                                  const uint8_t *buf, int size,
 646                                                  NetPacketSent *sent_cb)
 647 {
 648     NetQueue *queue;
 649     int ret;
 650
 651 #ifdef DEBUG_NET
 652     printf("qemu_send_packet_async:\n");
 653     qemu_hexdump((const char *)buf, stdout, "net", size);
 654 #endif
 655
 656     if (sender->link_down || !sender->peer) {
 657         return size;
 658     }
 659
 660     /* Let filters handle the packet first */
 661     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 662                          sender, flags, buf, size, sent_cb);
 663     if (ret) {
 664         return ret;
 665     }
 666
 667     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 668                          sender, flags, buf, size, sent_cb);
 669     if (ret) {
 670         return ret;
 671     }
 672
 673     queue = sender->peer->incoming_queue;
 674
 675     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 676 }
 677
 678 ssize_t qemu_send_packet_async(NetClientState *sender,
 679                                const uint8_t *buf, int size,
 680                                NetPacketSent *sent_cb)
 681 {
 682     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 683                                              buf, size, sent_cb);
 684 }
 685
 686 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 687 {
 688     qemu_send_packet_async(nc, buf, size, NULL);
 689 }
 690
 691 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 692 {
 693     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 694                                              buf, size, NULL);
 695 }
 696
 697 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 698                                int iovcnt, unsigned flags)
 699 {
 700     uint8_t *buf = NULL;
 701     uint8_t *buffer;
 702     size_t offset;
 703     ssize_t ret;
 704
 705     if (iovcnt == 1) {
 706         buffer = iov[0].iov_base;
 707         offset = iov[0].iov_len;
 708     } else {
 709         offset = iov_size(iov, iovcnt);
 710         if (offset > NET_BUFSIZE) {
 711             return -1;
 712         }
 713         buf = g_malloc(offset);
 714         buffer = buf;
 715         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 716     }
 717
 718     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 719         ret = nc->info->receive_raw(nc, buffer, offset);
 720     } else {
 721         ret = nc->info->receive(nc, buffer, offset);
 722     }
 723
 724     g_free(buf);
 725     return ret;
 726 }
 727
 728 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 729                                 unsigned flags,
 730                                 const struct iovec *iov,
 731                                 int iovcnt,
 732                                 void *opaque)
 733 {
 734     NetClientState *nc = opaque;
 735     int ret;
 736
 737     if (nc->link_down) {
 738         return iov_size(iov, iovcnt);
 739     }
 740
 741     if (nc->receive_disabled) {
 742         return 0;
 743     }
 744
 745     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 746         ret = nc->info->receive_iov(nc, iov, iovcnt);
 747     } else {
 748         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 749     }
 750
 751     if (ret == 0) {
 752         nc->receive_disabled = 1;
 753     }
 754
 755     return ret;
 756 }
 757
 758 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 759                                 const struct iovec *iov, int iovcnt,
 760                                 NetPacketSent *sent_cb)
 761 {
 762     NetQueue *queue;
 763     int ret;
 764
 765     if (sender->link_down || !sender->peer) {
 766         return iov_size(iov, iovcnt);
 767     }
 768
 769     /* Let filters handle the packet first */
 770     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 771                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 772     if (ret) {
 773         return ret;
 774     }
 775
 776     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 777                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 778     if (ret) {
 779         return ret;
 780     }
 781
 782     queue = sender->peer->incoming_queue;
 783
 784     return qemu_net_queue_send_iov(queue, sender,
 785                                    QEMU_NET_PACKET_FLAG_NONE,
 786                                    iov, iovcnt, sent_cb);
 787 }
 788
 789 ssize_t
 790 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 791 {
 792     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 793 }
 794
 795 NetClientState *qemu_find_netdev(const char *id)
 796 {
 797     NetClientState *nc;
 798
 799     QTAILQ_FOREACH(nc, &net_clients, next) {
 800         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 801             continue;
 802         if (!strcmp(nc->name, id)) {
 803             return nc;
 804         }
 805     }
 806
 807     return NULL;
 808 }
 809
 810 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 811                                  NetClientDriver type, int max)
 812 {
 813     NetClientState *nc;
 814     int ret = 0;
 815
 816     QTAILQ_FOREACH(nc, &net_clients, next) {
 817         if (nc->info->type == type) {
 818             continue;
 819         }
 820         if (!id || !strcmp(nc->name, id)) {
 821             if (ret < max) {
 822                 ncs[ret] = nc;
 823             }
 824             ret++;
 825         }
 826     }
 827
 828     return ret;
 829 }
 830
 831 static int nic_get_free_idx(void)
 832 {
 833     int index;
 834
 835     for (index = 0; index < MAX_NICS; index++)
 836         if (!nd_table[index].used)
 837             return index;
 838     return -1;
 839 }
 840
 841 int qemu_show_nic_models(const char *arg, const char *const *models)
 842 {
 843     int i;
 844
 845     if (!arg || !is_help_option(arg)) {
 846         return 0;
 847     }
 848
 849     fprintf(stderr, "qemu: Supported NIC models: ");
 850     for (i = 0 ; models[i]; i++)
 851         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 852     return 1;
 853 }
 854
 855 void qemu_check_nic_model(NICInfo *nd, const char *model)
 856 {
 857     const char *models[2];
 858
 859     models[0] = model;
 860     models[1] = NULL;
 861
 862     if (qemu_show_nic_models(nd->model, models))
 863         exit(0);
 864     if (qemu_find_nic_model(nd, models, model) < 0)
 865         exit(1);
 866 }
 867
 868 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 869                         const char *default_model)
 870 {
 871     int i;
 872
 873     if (!nd->model)
 874         nd->model = g_strdup(default_model);
 875
 876     for (i = 0 ; models[i]; i++) {
 877         if (strcmp(nd->model, models[i]) == 0)
 878             return i;
 879     }
 880
 881     error_report("Unsupported NIC model: %s", nd->model);
 882     return -1;
 883 }
 884
 885 static int net_init_nic(const Netdev *netdev, const char *name,
 886                         NetClientState *peer, Error **errp)
 887 {
 888     int idx;
 889     NICInfo *nd;
 890     const NetLegacyNicOptions *nic;
 891
 892     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 893     nic = &netdev->u.nic;
 894
 895     idx = nic_get_free_idx();
 896     if (idx == -1 || nb_nics >= MAX_NICS) {
 897         error_setg(errp, "too many NICs");
 898         return -1;
 899     }
 900
 901     nd = &nd_table[idx];
 902
 903     memset(nd, 0, sizeof(*nd));
 904
 905     if (nic->has_netdev) {
 906         nd->netdev = qemu_find_netdev(nic->netdev);
 907         if (!nd->netdev) {
 908             error_setg(errp, "netdev '%s' not found", nic->netdev);
 909             return -1;
 910         }
 911     } else {
 912         assert(peer);
 913         nd->netdev = peer;
 914     }
 915     nd->name = g_strdup(name);
 916     if (nic->has_model) {
 917         nd->model = g_strdup(nic->model);
 918     }
 919     if (nic->has_addr) {
 920         nd->devaddr = g_strdup(nic->addr);
 921     }
 922
 923     if (nic->has_macaddr &&
 924         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 925         error_setg(errp, "invalid syntax for ethernet address");
 926         return -1;
 927     }
 928     if (nic->has_macaddr &&
 929         is_multicast_ether_addr(nd->macaddr.a)) {
 930         error_setg(errp,
 931                    "NIC cannot have multicast MAC address (odd 1st byte)");
 932         return -1;
 933     }
 934     qemu_macaddr_default_if_unset(&nd->macaddr);
 935
 936     if (nic->has_vectors) {
 937         if (nic->vectors > 0x7ffffff) {
 938             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 939             return -1;
 940         }
 941         nd->nvectors = nic->vectors;
 942     } else {
 943         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 944     }
 945
 946     nd->used = 1;
 947     nb_nics++;
 948
 949     return idx;
 950 }
 951
 952
 953 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 954     const Netdev *netdev,
 955     const char *name,
 956     NetClientState *peer, Error **errp) = {
 957         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 958 #ifdef CONFIG_SLIRP
 959         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 960 #endif
 961         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 962         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 963 #ifdef CONFIG_VDE
 964         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 965 #endif
 966 #ifdef CONFIG_NETMAP
 967         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 968 #endif
 969 #ifdef CONFIG_NET_BRIDGE
 970         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 971 #endif
 972         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 973 #ifdef CONFIG_VHOST_NET_USED
 974         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 975 #endif
 976 #ifdef CONFIG_L2TPV3
 977         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 978 #endif
 979 };
 980
 981
 982 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 983 {
 984     Netdev legacy = {0};
 985     const Netdev *netdev;
 986     const char *name;
 987     NetClientState *peer = NULL;
 988     static bool vlan_warned;
 989
 990     if (is_netdev) {
 991         netdev = object;
 992         name = netdev->id;
 993
 994         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 995             !net_client_init_fun[netdev->type]) {
 996             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 997                        "a netdev backend type");
 998             return -1;
 999         }
1000     } else {
1001         const NetLegacy *net = object;
1002         const NetLegacyOptions *opts = net->opts;
1003         legacy.id = net->id;
1004         netdev = &legacy;
1005         /* missing optional values have been initialized to "all bits zero" */
1006         name = net->has_id ? net->id : net->name;
1007
1008         /* Map the old options to the new flat type */
1009         switch (opts->type) {
1010         case NET_LEGACY_OPTIONS_TYPE_NONE:
1011             return 0; /* nothing to do */
1012         case NET_LEGACY_OPTIONS_TYPE_NIC:
1013             legacy.type = NET_CLIENT_DRIVER_NIC;
1014             legacy.u.nic = opts->u.nic;
1015             break;
1016         case NET_LEGACY_OPTIONS_TYPE_USER:
1017             legacy.type = NET_CLIENT_DRIVER_USER;
1018             legacy.u.user = opts->u.user;
1019             break;
1020         case NET_LEGACY_OPTIONS_TYPE_TAP:
1021             legacy.type = NET_CLIENT_DRIVER_TAP;
1022             legacy.u.tap = opts->u.tap;
1023             break;
1024         case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1025             legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1026             legacy.u.l2tpv3 = opts->u.l2tpv3;
1027             break;
1028         case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1029             legacy.type = NET_CLIENT_DRIVER_SOCKET;
1030             legacy.u.socket = opts->u.socket;
1031             break;
1032         case NET_LEGACY_OPTIONS_TYPE_VDE:
1033             legacy.type = NET_CLIENT_DRIVER_VDE;
1034             legacy.u.vde = opts->u.vde;
1035             break;
1036         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1037             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1038             legacy.u.bridge = opts->u.bridge;
1039             break;
1040         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1041             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1042             legacy.u.netmap = opts->u.netmap;
1043             break;
1044         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1045             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1046             legacy.u.vhost_user = opts->u.vhost_user;
1047             break;
1048         default:
1049             abort();
1050         }
1051
1052         if (!net_client_init_fun[netdev->type]) {
1053             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1054                        "a net backend type (maybe it is not compiled "
1055                        "into this binary)");
1056             return -1;
1057         }
1058
1059         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1060         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1061             !opts->u.nic.has_netdev) {
1062             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL, NULL);
1063         }
1064
1065         if (net->has_vlan && !vlan_warned) {
1066             error_report("'vlan' is deprecated. Please use 'netdev' instead.");
1067             vlan_warned = true;
1068         }
1069     }
1070
1071     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1072         /* FIXME drop when all init functions store an Error */
1073         if (errp && !*errp) {
1074             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1075                        NetClientDriver_str(netdev->type));
1076         }
1077         return -1;
1078     }
1079     return 0;
1080 }
1081
1082 static void show_netdevs(void)
1083 {
1084     int idx;
1085     const char *available_netdevs[] = {
1086         "socket",
1087         "hubport",
1088         "tap",
1089 #ifdef CONFIG_SLIRP
1090         "user",
1091 #endif
1092 #ifdef CONFIG_L2TPV3
1093         "l2tpv3",
1094 #endif
1095 #ifdef CONFIG_VDE
1096         "vde",
1097 #endif
1098 #ifdef CONFIG_NET_BRIDGE
1099         "bridge",
1100 #endif
1101 #ifdef CONFIG_NETMAP
1102         "netmap",
1103 #endif
1104 #ifdef CONFIG_POSIX
1105         "vhost-user",
1106 #endif
1107     };
1108
1109     printf("Available netdev backend types:\n");
1110     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1111         puts(available_netdevs[idx]);
1112     }
1113 }
1114
1115 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1116 {
1117     void *object = NULL;
1118     Error *err = NULL;
1119     int ret = -1;
1120     Visitor *v = opts_visitor_new(opts);
1121
1122     if (is_netdev && is_help_option(qemu_opt_get(opts, "type"))) {
1123         show_netdevs();
1124         exit(0);
1125     } else {
1126         /* Parse convenience option format ip6-net=fec0::0[/64] */
1127         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1128
1129         if (ip6_net) {
1130             char buf[strlen(ip6_net) + 1];
1131
1132             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1133                 /* Default 64bit prefix length.  */
1134                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1135                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1136             } else {
1137                 /* User-specified prefix length.  */
1138                 unsigned long len;
1139                 int err;
1140
1141                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1142                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1143
1144                 if (err) {
1145                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1146                               "ipv6-prefix", "a number");
1147                 } else {
1148                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1149                                         &error_abort);
1150                 }
1151             }
1152             qemu_opt_unset(opts, "ipv6-net");
1153         }
1154     }
1155
1156     if (is_netdev) {
1157         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1158     } else {
1159         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1160     }
1161
1162     if (!err) {
1163         ret = net_client_init1(object, is_netdev, &err);
1164     }
1165
1166     if (is_netdev) {
1167         qapi_free_Netdev(object);
1168     } else {
1169         qapi_free_NetLegacy(object);
1170     }
1171
1172     error_propagate(errp, err);
1173     visit_free(v);
1174     return ret;
1175 }
1176
1177
1178 static int net_host_check_device(const char *device)
1179 {
1180     int i;
1181     for (i = 0; host_net_devices[i]; i++) {
1182         if (!strncmp(host_net_devices[i], device,
1183                      strlen(host_net_devices[i]))) {
1184             return 1;
1185         }
1186     }
1187
1188     return 0;
1189 }
1190
1191 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1192 {
1193     const char *device = qdict_get_str(qdict, "device");
1194     const char *opts_str = qdict_get_try_str(qdict, "opts");
1195     Error *local_err = NULL;
1196     QemuOpts *opts;
1197     static bool warned;
1198
1199     if (!warned && !qtest_enabled()) {
1200         error_report("host_net_add is deprecated, use netdev_add instead");
1201         warned = true;
1202     }
1203
1204     if (!net_host_check_device(device)) {
1205         monitor_printf(mon, "invalid host network device %s\n", device);
1206         return;
1207     }
1208
1209     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1210                                    opts_str ? opts_str : "", false);
1211     if (!opts) {
1212         return;
1213     }
1214
1215     qemu_opt_set(opts, "type", device, &error_abort);
1216
1217     net_client_init(opts, false, &local_err);
1218     if (local_err) {
1219         error_report_err(local_err);
1220         monitor_printf(mon, "adding host network device %s failed\n", device);
1221     }
1222 }
1223
1224 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1225 {
1226     NetClientState *nc;
1227     int vlan_id = qdict_get_int(qdict, "vlan_id");
1228     const char *device = qdict_get_str(qdict, "device");
1229     static bool warned;
1230
1231     if (!warned && !qtest_enabled()) {
1232         error_report("host_net_remove is deprecated, use netdev_del instead");
1233         warned = true;
1234     }
1235
1236     nc = net_hub_find_client_by_name(vlan_id, device);
1237     if (!nc) {
1238         error_report("Host network device '%s' on hub '%d' not found",
1239                      device, vlan_id);
1240         return;
1241     }
1242     if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1243         error_report("invalid host network device '%s'", device);
1244         return;
1245     }
1246
1247     qemu_del_net_client(nc->peer);
1248     qemu_del_net_client(nc);
1249     qemu_opts_del(qemu_opts_find(qemu_find_opts("net"), device));
1250 }
1251
1252 void netdev_add(QemuOpts *opts, Error **errp)
1253 {
1254     net_client_init(opts, true, errp);
1255 }
1256
1257 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1258 {
1259     Error *local_err = NULL;
1260     QemuOptsList *opts_list;
1261     QemuOpts *opts;
1262
1263     opts_list = qemu_find_opts_err("netdev", &local_err);
1264     if (local_err) {
1265         goto out;
1266     }
1267
1268     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1269     if (local_err) {
1270         goto out;
1271     }
1272
1273     netdev_add(opts, &local_err);
1274     if (local_err) {
1275         qemu_opts_del(opts);
1276         goto out;
1277     }
1278
1279 out:
1280     error_propagate(errp, local_err);
1281 }
1282
1283 void qmp_netdev_del(const char *id, Error **errp)
1284 {
1285     NetClientState *nc;
1286     QemuOpts *opts;
1287
1288     nc = qemu_find_netdev(id);
1289     if (!nc) {
1290         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1291                   "Device '%s' not found", id);
1292         return;
1293     }
1294
1295     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1296     if (!opts) {
1297         error_setg(errp, "Device '%s' is not a netdev", id);
1298         return;
1299     }
1300
1301     qemu_del_net_client(nc);
1302     qemu_opts_del(opts);
1303 }
1304
1305 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1306 {
1307     char *str;
1308     ObjectProperty *prop;
1309     ObjectPropertyIterator iter;
1310     Visitor *v;
1311
1312     /* generate info str */
1313     object_property_iter_init(&iter, OBJECT(nf));
1314     while ((prop = object_property_iter_next(&iter))) {
1315         if (!strcmp(prop->name, "type")) {
1316             continue;
1317         }
1318         v = string_output_visitor_new(false, &str);
1319         object_property_get(OBJECT(nf), v, prop->name, NULL);
1320         visit_complete(v, &str);
1321         visit_free(v);
1322         monitor_printf(mon, ",%s=%s", prop->name, str);
1323         g_free(str);
1324     }
1325     monitor_printf(mon, "\n");
1326 }
1327
1328 void print_net_client(Monitor *mon, NetClientState *nc)
1329 {
1330     NetFilterState *nf;
1331
1332     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1333                    nc->queue_index,
1334                    NetClientDriver_str(nc->info->type),
1335                    nc->info_str);
1336     if (!QTAILQ_EMPTY(&nc->filters)) {
1337         monitor_printf(mon, "filters:\n");
1338     }
1339     QTAILQ_FOREACH(nf, &nc->filters, next) {
1340         char *path = object_get_canonical_path_component(OBJECT(nf));
1341
1342         monitor_printf(mon, "  - %s: type=%s", path,
1343                        object_get_typename(OBJECT(nf)));
1344         netfilter_print_info(mon, nf);
1345         g_free(path);
1346     }
1347 }
1348
1349 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1350                                       Error **errp)
1351 {
1352     NetClientState *nc;
1353     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1354
1355     QTAILQ_FOREACH(nc, &net_clients, next) {
1356         RxFilterInfoList *entry;
1357         RxFilterInfo *info;
1358
1359         if (has_name && strcmp(nc->name, name) != 0) {
1360             continue;
1361         }
1362
1363         /* only query rx-filter information of NIC */
1364         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1365             if (has_name) {
1366                 error_setg(errp, "net client(%s) isn't a NIC", name);
1367                 return NULL;
1368             }
1369             continue;
1370         }
1371
1372         /* only query information on queue 0 since the info is per nic,
1373          * not per queue
1374          */
1375         if (nc->queue_index != 0)
1376             continue;
1377
1378         if (nc->info->query_rx_filter) {
1379             info = nc->info->query_rx_filter(nc);
1380             entry = g_malloc0(sizeof(*entry));
1381             entry->value = info;
1382
1383             if (!filter_list) {
1384                 filter_list = entry;
1385             } else {
1386                 last_entry->next = entry;
1387             }
1388             last_entry = entry;
1389         } else if (has_name) {
1390             error_setg(errp, "net client(%s) doesn't support"
1391                        " rx-filter querying", name);
1392             return NULL;
1393         }
1394
1395         if (has_name) {
1396             break;
1397         }
1398     }
1399
1400     if (filter_list == NULL && has_name) {
1401         error_setg(errp, "invalid net client name: %s", name);
1402     }
1403
1404     return filter_list;
1405 }
1406
1407 void hmp_info_network(Monitor *mon, const QDict *qdict)
1408 {
1409     NetClientState *nc, *peer;
1410     NetClientDriver type;
1411
1412     net_hub_info(mon);
1413
1414     QTAILQ_FOREACH(nc, &net_clients, next) {
1415         peer = nc->peer;
1416         type = nc->info->type;
1417
1418         /* Skip if already printed in hub info */
1419         if (net_hub_id_for_client(nc, NULL) == 0) {
1420             continue;
1421         }
1422
1423         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1424             print_net_client(mon, nc);
1425         } /* else it's a netdev connected to a NIC, printed with the NIC */
1426         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1427             monitor_printf(mon, " \\ ");
1428             print_net_client(mon, peer);
1429         }
1430     }
1431 }
1432
1433 void qmp_set_link(const char *name, bool up, Error **errp)
1434 {
1435     NetClientState *ncs[MAX_QUEUE_NUM];
1436     NetClientState *nc;
1437     int queues, i;
1438
1439     queues = qemu_find_net_clients_except(name, ncs,
1440                                           NET_CLIENT_DRIVER__MAX,
1441                                           MAX_QUEUE_NUM);
1442
1443     if (queues == 0) {
1444         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1445                   "Device '%s' not found", name);
1446         return;
1447     }
1448     nc = ncs[0];
1449
1450     for (i = 0; i < queues; i++) {
1451         ncs[i]->link_down = !up;
1452     }
1453
1454     if (nc->info->link_status_changed) {
1455         nc->info->link_status_changed(nc);
1456     }
1457
1458     if (nc->peer) {
1459         /* Change peer link only if the peer is NIC and then notify peer.
1460          * If the peer is a HUBPORT or a backend, we do not change the
1461          * link status.
1462          *
1463          * This behavior is compatible with qemu vlans where there could be
1464          * multiple clients that can still communicate with each other in
1465          * disconnected mode. For now maintain this compatibility.
1466          */
1467         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1468             for (i = 0; i < queues; i++) {
1469                 ncs[i]->peer->link_down = !up;
1470             }
1471         }
1472         if (nc->peer->info->link_status_changed) {
1473             nc->peer->info->link_status_changed(nc->peer);
1474         }
1475     }
1476 }
1477
1478 static void net_vm_change_state_handler(void *opaque, int running,
1479                                         RunState state)
1480 {
1481     NetClientState *nc;
1482     NetClientState *tmp;
1483
1484     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1485         if (running) {
1486             /* Flush queued packets and wake up backends. */
1487             if (nc->peer && qemu_can_send_packet(nc)) {
1488                 qemu_flush_queued_packets(nc->peer);
1489             }
1490         } else {
1491             /* Complete all queued packets, to guarantee we don't modify
1492              * state later when VM is not running.
1493              */
1494             qemu_flush_or_purge_queued_packets(nc, true);
1495         }
1496     }
1497 }
1498
1499 void net_cleanup(void)
1500 {
1501     NetClientState *nc;
1502
1503     /* We may del multiple entries during qemu_del_net_client(),
1504      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1505      */
1506     while (!QTAILQ_EMPTY(&net_clients)) {
1507         nc = QTAILQ_FIRST(&net_clients);
1508         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1509             qemu_del_nic(qemu_get_nic(nc));
1510         } else {
1511             qemu_del_net_client(nc);
1512         }
1513     }
1514
1515     qemu_del_vm_change_state_handler(net_change_state_entry);
1516 }
1517
1518 void net_check_clients(void)
1519 {
1520     NetClientState *nc;
1521     int i;
1522
1523     net_hub_check_clients();
1524
1525     QTAILQ_FOREACH(nc, &net_clients, next) {
1526         if (!nc->peer) {
1527             warn_report("%s %s has no peer",
1528                         nc->info->type == NET_CLIENT_DRIVER_NIC
1529                         ? "nic" : "netdev",
1530                         nc->name);
1531         }
1532     }
1533
1534     /* Check that all NICs requested via -net nic actually got created.
1535      * NICs created via -device don't need to be checked here because
1536      * they are always instantiated.
1537      */
1538     for (i = 0; i < MAX_NICS; i++) {
1539         NICInfo *nd = &nd_table[i];
1540         if (nd->used && !nd->instantiated) {
1541             warn_report("requested NIC (%s, model %s) "
1542                         "was not created (not supported by this machine?)",
1543                         nd->name ? nd->name : "anonymous",
1544                         nd->model ? nd->model : "unspecified");
1545         }
1546     }
1547 }
1548
1549 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1550 {
1551     return net_client_init(opts, false, errp);
1552 }
1553
1554 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1555 {
1556     return net_client_init(opts, true, errp);
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("net"), net_init_client, NULL, errp)) {
1572         return -1;
1573     }
1574
1575     return 0;
1576 }
1577
1578 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1579 {
1580     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1581         return -1;
1582     }
1583
1584     return 0;
1585 }
1586
1587 /* From FreeBSD */
1588 /* XXX: optimize */
1589 uint32_t net_crc32(const uint8_t *p, int len)
1590 {
1591     uint32_t crc;
1592     int carry, i, j;
1593     uint8_t b;
1594
1595     crc = 0xffffffff;
1596     for (i = 0; i < len; i++) {
1597         b = *p++;
1598         for (j = 0; j < 8; j++) {
1599             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1600             crc <<= 1;
1601             b >>= 1;
1602             if (carry) {
1603                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1604             }
1605         }
1606     }
1607
1608     return crc;
1609 }
1610
1611 uint32_t net_crc32_le(const uint8_t *p, int len)
1612 {
1613     uint32_t crc;
1614     int carry, i, j;
1615     uint8_t b;
1616
1617     crc = 0xffffffff;
1618     for (i = 0; i < len; i++) {
1619         b = *p++;
1620         for (j = 0; j < 8; j++) {
1621             carry = (crc & 0x1) ^ (b & 0x01);
1622             crc >>= 1;
1623             b >>= 1;
1624             if (carry) {
1625                 crc ^= POLYNOMIAL_LE;
1626             }
1627         }
1628     }
1629
1630     return crc;
1631 }
1632
1633 QemuOptsList qemu_netdev_opts = {
1634     .name = "netdev",
1635     .implied_opt_name = "type",
1636     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1637     .desc = {
1638         /*
1639          * no elements => accept any params
1640          * validation will happen later
1641          */
1642         { /* end of list */ }
1643     },
1644 };
1645
1646 QemuOptsList qemu_net_opts = {
1647     .name = "net",
1648     .implied_opt_name = "type",
1649     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1650     .desc = {
1651         /*
1652          * no elements => accept any params
1653          * validation will happen later
1654          */
1655         { /* end of list */ }
1656     },
1657 };
1658
1659 void net_socket_rs_init(SocketReadState *rs,
1660                         SocketReadStateFinalize *finalize,
1661                         bool vnet_hdr)
1662 {
1663     rs->state = 0;
1664     rs->vnet_hdr = vnet_hdr;
1665     rs->index = 0;
1666     rs->packet_len = 0;
1667     rs->vnet_hdr_len = 0;
1668     memset(rs->buf, 0, sizeof(rs->buf));
1669     rs->finalize = finalize;
1670 }
1671
1672 /*
1673  * Returns
1674  * 0: success
1675  * -1: error occurs
1676  */
1677 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1678 {
1679     unsigned int l;
1680
1681     while (size > 0) {
1682         /* Reassemble a packet from the network.
1683          * 0 = getting length.
1684          * 1 = getting vnet header length.
1685          * 2 = getting data.
1686          */
1687         switch (rs->state) {
1688         case 0:
1689             l = 4 - rs->index;
1690             if (l > size) {
1691                 l = size;
1692             }
1693             memcpy(rs->buf + rs->index, buf, l);
1694             buf += l;
1695             size -= l;
1696             rs->index += l;
1697             if (rs->index == 4) {
1698                 /* got length */
1699                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1700                 rs->index = 0;
1701                 if (rs->vnet_hdr) {
1702                     rs->state = 1;
1703                 } else {
1704                     rs->state = 2;
1705                     rs->vnet_hdr_len = 0;
1706                 }
1707             }
1708             break;
1709         case 1:
1710             l = 4 - rs->index;
1711             if (l > size) {
1712                 l = size;
1713             }
1714             memcpy(rs->buf + rs->index, buf, l);
1715             buf += l;
1716             size -= l;
1717             rs->index += l;
1718             if (rs->index == 4) {
1719                 /* got vnet header length */
1720                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1721                 rs->index = 0;
1722                 rs->state = 2;
1723             }
1724             break;
1725         case 2:
1726             l = rs->packet_len - rs->index;
1727             if (l > size) {
1728                 l = size;
1729             }
1730             if (rs->index + l <= sizeof(rs->buf)) {
1731                 memcpy(rs->buf + rs->index, buf, l);
1732             } else {
1733                 fprintf(stderr, "serious error: oversized packet received,"
1734                     "connection terminated.\n");
1735                 rs->index = rs->state = 0;
1736                 return -1;
1737             }
1738
1739             rs->index += l;
1740             buf += l;
1741             size -= l;
1742             if (rs->index >= rs->packet_len) {
1743                 rs->index = 0;
1744                 rs->state = 0;
1745                 assert(rs->finalize);
1746                 rs->finalize(rs);
1747             }
1748             break;
1749         }
1750     }
1751
1752     assert(size == 0);
1753     return 0;
1754 }