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 #include "qemu/osdep.h"
  25
  26 #include "net/net.h"
  27 #include "clients.h"
  28 #include "hub.h"
  29 #include "net/slirp.h"
  30 #include "net/eth.h"
  31 #include "util.h"
  32
  33 #include "monitor/monitor.h"
  34 #include "qemu-common.h"
  35 #include "qemu/help_option.h"
  36 #include "qapi/qmp/qerror.h"
  37 #include "qemu/error-report.h"
  38 #include "qemu/sockets.h"
  39 #include "qemu/cutils.h"
  40 #include "qemu/config-file.h"
  41 #include "qmp-commands.h"
  42 #include "hw/qdev.h"
  43 #include "qemu/iov.h"
  44 #include "qemu/main-loop.h"
  45 #include "qapi-visit.h"
  46 #include "qapi/opts-visitor.h"
  47 #include "sysemu/sysemu.h"
  48 #include "sysemu/qtest.h"
  49 #include "net/filter.h"
  50 #include "qapi/string-output-visitor.h"
  51
  52 /* Net bridge is currently not supported for W32. */
  53 #if !defined(_WIN32)
  54 # define CONFIG_NET_BRIDGE
  55 #endif
  56
  57 static VMChangeStateEntry *net_change_state_entry;
  58 static QTAILQ_HEAD(, NetClientState) net_clients;
  59
  60 const char *host_net_devices[] = {
  61     "tap",
  62     "socket",
  63     "dump",
  64 #ifdef CONFIG_NET_BRIDGE
  65     "bridge",
  66 #endif
  67 #ifdef CONFIG_NETMAP
  68     "netmap",
  69 #endif
  70 #ifdef CONFIG_SLIRP
  71     "user",
  72 #endif
  73 #ifdef CONFIG_VDE
  74     "vde",
  75 #endif
  76     "vhost-user",
  77     NULL,
  78 };
  79
  80 /***********************************************************/
  81 /* network device redirectors */
  82
  83 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  84 {
  85     const char *p, *p1;
  86     int len;
  87     p = *pp;
  88     p1 = strchr(p, sep);
  89     if (!p1)
  90         return -1;
  91     len = p1 - p;
  92     p1++;
  93     if (buf_size > 0) {
  94         if (len > buf_size - 1)
  95             len = buf_size - 1;
  96         memcpy(buf, p, len);
  97         buf[len] = '\0';
  98     }
  99     *pp = p1;
 100     return 0;
 101 }
 102
 103 int parse_host_port(struct sockaddr_in *saddr, const char *str,
 104                     Error **errp)
 105 {
 106     char buf[512];
 107     struct hostent *he;
 108     const char *p, *r;
 109     int port;
 110
 111     p = str;
 112     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 113         error_setg(errp, "host address '%s' doesn't contain ':' "
 114                    "separating host from port", str);
 115         return -1;
 116     }
 117     saddr->sin_family = AF_INET;
 118     if (buf[0] == '\0') {
 119         saddr->sin_addr.s_addr = 0;
 120     } else {
 121         if (qemu_isdigit(buf[0])) {
 122             if (!inet_aton(buf, &saddr->sin_addr)) {
 123                 error_setg(errp, "host address '%s' is not a valid "
 124                            "IPv4 address", buf);
 125                 return -1;
 126             }
 127         } else {
 128             he = gethostbyname(buf);
 129             if (he == NULL) {
 130                 error_setg(errp, "can't resolve host address '%s'", buf);
 131                 return - 1;
 132             }
 133             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 134         }
 135     }
 136     port = strtol(p, (char **)&r, 0);
 137     if (r == p) {
 138         error_setg(errp, "port number '%s' is invalid", p);
 139         return -1;
 140     }
 141     saddr->sin_port = htons(port);
 142     return 0;
 143 }
 144
 145 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 146 {
 147     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 148                            macaddr[0], macaddr[1], macaddr[2],
 149                            macaddr[3], macaddr[4], macaddr[5]);
 150 }
 151
 152 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 153 {
 154     snprintf(nc->info_str, sizeof(nc->info_str),
 155              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 156              nc->model,
 157              macaddr[0], macaddr[1], macaddr[2],
 158              macaddr[3], macaddr[4], macaddr[5]);
 159 }
 160
 161 static int mac_table[256] = {0};
 162
 163 static void qemu_macaddr_set_used(MACAddr *macaddr)
 164 {
 165     int index;
 166
 167     for (index = 0x56; index < 0xFF; index++) {
 168         if (macaddr->a[5] == index) {
 169             mac_table[index]++;
 170         }
 171     }
 172 }
 173
 174 static void qemu_macaddr_set_free(MACAddr *macaddr)
 175 {
 176     int index;
 177     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 178
 179     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 180         return;
 181     }
 182     for (index = 0x56; index < 0xFF; index++) {
 183         if (macaddr->a[5] == index) {
 184             mac_table[index]--;
 185         }
 186     }
 187 }
 188
 189 static int qemu_macaddr_get_free(void)
 190 {
 191     int index;
 192
 193     for (index = 0x56; index < 0xFF; index++) {
 194         if (mac_table[index] == 0) {
 195             return index;
 196         }
 197     }
 198
 199     return -1;
 200 }
 201
 202 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 203 {
 204     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 205     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 206
 207     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 208         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 209             return;
 210         } else {
 211             qemu_macaddr_set_used(macaddr);
 212             return;
 213         }
 214     }
 215
 216     macaddr->a[0] = 0x52;
 217     macaddr->a[1] = 0x54;
 218     macaddr->a[2] = 0x00;
 219     macaddr->a[3] = 0x12;
 220     macaddr->a[4] = 0x34;
 221     macaddr->a[5] = qemu_macaddr_get_free();
 222     qemu_macaddr_set_used(macaddr);
 223 }
 224
 225 /**
 226  * Generate a name for net client
 227  *
 228  * Only net clients created with the legacy -net option and NICs need this.
 229  */
 230 static char *assign_name(NetClientState *nc1, const char *model)
 231 {
 232     NetClientState *nc;
 233     int id = 0;
 234
 235     QTAILQ_FOREACH(nc, &net_clients, next) {
 236         if (nc == nc1) {
 237             continue;
 238         }
 239         if (strcmp(nc->model, model) == 0) {
 240             id++;
 241         }
 242     }
 243
 244     return g_strdup_printf("%s.%d", model, id);
 245 }
 246
 247 static void qemu_net_client_destructor(NetClientState *nc)
 248 {
 249     g_free(nc);
 250 }
 251
 252 static void qemu_net_client_setup(NetClientState *nc,
 253                                   NetClientInfo *info,
 254                                   NetClientState *peer,
 255                                   const char *model,
 256                                   const char *name,
 257                                   NetClientDestructor *destructor)
 258 {
 259     nc->info = info;
 260     nc->model = g_strdup(model);
 261     if (name) {
 262         nc->name = g_strdup(name);
 263     } else {
 264         nc->name = assign_name(nc, model);
 265     }
 266
 267     if (peer) {
 268         assert(!peer->peer);
 269         nc->peer = peer;
 270         peer->peer = nc;
 271     }
 272     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 273
 274     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 275     nc->destructor = destructor;
 276     QTAILQ_INIT(&nc->filters);
 277 }
 278
 279 NetClientState *qemu_new_net_client(NetClientInfo *info,
 280                                     NetClientState *peer,
 281                                     const char *model,
 282                                     const char *name)
 283 {
 284     NetClientState *nc;
 285
 286     assert(info->size >= sizeof(NetClientState));
 287
 288     nc = g_malloc0(info->size);
 289     qemu_net_client_setup(nc, info, peer, model, name,
 290                           qemu_net_client_destructor);
 291
 292     return nc;
 293 }
 294
 295 NICState *qemu_new_nic(NetClientInfo *info,
 296                        NICConf *conf,
 297                        const char *model,
 298                        const char *name,
 299                        void *opaque)
 300 {
 301     NetClientState **peers = conf->peers.ncs;
 302     NICState *nic;
 303     int i, queues = MAX(1, conf->peers.queues);
 304
 305     assert(info->type == NET_CLIENT_DRIVER_NIC);
 306     assert(info->size >= sizeof(NICState));
 307
 308     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 309     nic->ncs = (void *)nic + info->size;
 310     nic->conf = conf;
 311     nic->opaque = opaque;
 312
 313     for (i = 0; i < queues; i++) {
 314         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 315                               NULL);
 316         nic->ncs[i].queue_index = i;
 317     }
 318
 319     return nic;
 320 }
 321
 322 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 323 {
 324     return nic->ncs + queue_index;
 325 }
 326
 327 NetClientState *qemu_get_queue(NICState *nic)
 328 {
 329     return qemu_get_subqueue(nic, 0);
 330 }
 331
 332 NICState *qemu_get_nic(NetClientState *nc)
 333 {
 334     NetClientState *nc0 = nc - nc->queue_index;
 335
 336     return (NICState *)((void *)nc0 - nc->info->size);
 337 }
 338
 339 void *qemu_get_nic_opaque(NetClientState *nc)
 340 {
 341     NICState *nic = qemu_get_nic(nc);
 342
 343     return nic->opaque;
 344 }
 345
 346 static void qemu_cleanup_net_client(NetClientState *nc)
 347 {
 348     QTAILQ_REMOVE(&net_clients, nc, next);
 349
 350     if (nc->info->cleanup) {
 351         nc->info->cleanup(nc);
 352     }
 353 }
 354
 355 static void qemu_free_net_client(NetClientState *nc)
 356 {
 357     if (nc->incoming_queue) {
 358         qemu_del_net_queue(nc->incoming_queue);
 359     }
 360     if (nc->peer) {
 361         nc->peer->peer = NULL;
 362     }
 363     g_free(nc->name);
 364     g_free(nc->model);
 365     if (nc->destructor) {
 366         nc->destructor(nc);
 367     }
 368 }
 369
 370 void qemu_del_net_client(NetClientState *nc)
 371 {
 372     NetClientState *ncs[MAX_QUEUE_NUM];
 373     int queues, i;
 374     NetFilterState *nf, *next;
 375
 376     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 377
 378     /* If the NetClientState belongs to a multiqueue backend, we will change all
 379      * other NetClientStates also.
 380      */
 381     queues = qemu_find_net_clients_except(nc->name, ncs,
 382                                           NET_CLIENT_DRIVER_NIC,
 383                                           MAX_QUEUE_NUM);
 384     assert(queues != 0);
 385
 386     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 387         object_unparent(OBJECT(nf));
 388     }
 389
 390     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 391     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 392         NICState *nic = qemu_get_nic(nc->peer);
 393         if (nic->peer_deleted) {
 394             return;
 395         }
 396         nic->peer_deleted = true;
 397
 398         for (i = 0; i < queues; i++) {
 399             ncs[i]->peer->link_down = true;
 400         }
 401
 402         if (nc->peer->info->link_status_changed) {
 403             nc->peer->info->link_status_changed(nc->peer);
 404         }
 405
 406         for (i = 0; i < queues; i++) {
 407             qemu_cleanup_net_client(ncs[i]);
 408         }
 409
 410         return;
 411     }
 412
 413     for (i = 0; i < queues; i++) {
 414         qemu_cleanup_net_client(ncs[i]);
 415         qemu_free_net_client(ncs[i]);
 416     }
 417 }
 418
 419 void qemu_del_nic(NICState *nic)
 420 {
 421     int i, queues = MAX(nic->conf->peers.queues, 1);
 422
 423     qemu_macaddr_set_free(&nic->conf->macaddr);
 424
 425     /* If this is a peer NIC and peer has already been deleted, free it now. */
 426     if (nic->peer_deleted) {
 427         for (i = 0; i < queues; i++) {
 428             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 429         }
 430     }
 431
 432     for (i = queues - 1; i >= 0; i--) {
 433         NetClientState *nc = qemu_get_subqueue(nic, i);
 434
 435         qemu_cleanup_net_client(nc);
 436         qemu_free_net_client(nc);
 437     }
 438
 439     g_free(nic);
 440 }
 441
 442 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 443 {
 444     NetClientState *nc;
 445
 446     QTAILQ_FOREACH(nc, &net_clients, next) {
 447         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 448             if (nc->queue_index == 0) {
 449                 func(qemu_get_nic(nc), opaque);
 450             }
 451         }
 452     }
 453 }
 454
 455 bool qemu_has_ufo(NetClientState *nc)
 456 {
 457     if (!nc || !nc->info->has_ufo) {
 458         return false;
 459     }
 460
 461     return nc->info->has_ufo(nc);
 462 }
 463
 464 bool qemu_has_vnet_hdr(NetClientState *nc)
 465 {
 466     if (!nc || !nc->info->has_vnet_hdr) {
 467         return false;
 468     }
 469
 470     return nc->info->has_vnet_hdr(nc);
 471 }
 472
 473 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 474 {
 475     if (!nc || !nc->info->has_vnet_hdr_len) {
 476         return false;
 477     }
 478
 479     return nc->info->has_vnet_hdr_len(nc, len);
 480 }
 481
 482 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 483 {
 484     if (!nc || !nc->info->using_vnet_hdr) {
 485         return;
 486     }
 487
 488     nc->info->using_vnet_hdr(nc, enable);
 489 }
 490
 491 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 492                           int ecn, int ufo)
 493 {
 494     if (!nc || !nc->info->set_offload) {
 495         return;
 496     }
 497
 498     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 499 }
 500
 501 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 502 {
 503     if (!nc || !nc->info->set_vnet_hdr_len) {
 504         return;
 505     }
 506
 507     nc->vnet_hdr_len = len;
 508     nc->info->set_vnet_hdr_len(nc, len);
 509 }
 510
 511 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 512 {
 513 #ifdef HOST_WORDS_BIGENDIAN
 514     if (!nc || !nc->info->set_vnet_le) {
 515         return -ENOSYS;
 516     }
 517
 518     return nc->info->set_vnet_le(nc, is_le);
 519 #else
 520     return 0;
 521 #endif
 522 }
 523
 524 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 525 {
 526 #ifdef HOST_WORDS_BIGENDIAN
 527     return 0;
 528 #else
 529     if (!nc || !nc->info->set_vnet_be) {
 530         return -ENOSYS;
 531     }
 532
 533     return nc->info->set_vnet_be(nc, is_be);
 534 #endif
 535 }
 536
 537 int qemu_can_send_packet(NetClientState *sender)
 538 {
 539     int vm_running = runstate_is_running();
 540
 541     if (!vm_running) {
 542         return 0;
 543     }
 544
 545     if (!sender->peer) {
 546         return 1;
 547     }
 548
 549     if (sender->peer->receive_disabled) {
 550         return 0;
 551     } else if (sender->peer->info->can_receive &&
 552                !sender->peer->info->can_receive(sender->peer)) {
 553         return 0;
 554     }
 555     return 1;
 556 }
 557
 558 static ssize_t filter_receive_iov(NetClientState *nc,
 559                                   NetFilterDirection direction,
 560                                   NetClientState *sender,
 561                                   unsigned flags,
 562                                   const struct iovec *iov,
 563                                   int iovcnt,
 564                                   NetPacketSent *sent_cb)
 565 {
 566     ssize_t ret = 0;
 567     NetFilterState *nf = NULL;
 568
 569     if (direction == NET_FILTER_DIRECTION_TX) {
 570         QTAILQ_FOREACH(nf, &nc->filters, next) {
 571             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 572                                          iovcnt, sent_cb);
 573             if (ret) {
 574                 return ret;
 575             }
 576         }
 577     } else {
 578         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
 579             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 580                                          iovcnt, sent_cb);
 581             if (ret) {
 582                 return ret;
 583             }
 584         }
 585     }
 586
 587     return ret;
 588 }
 589
 590 static ssize_t filter_receive(NetClientState *nc,
 591                               NetFilterDirection direction,
 592                               NetClientState *sender,
 593                               unsigned flags,
 594                               const uint8_t *data,
 595                               size_t size,
 596                               NetPacketSent *sent_cb)
 597 {
 598     struct iovec iov = {
 599         .iov_base = (void *)data,
 600         .iov_len = size
 601     };
 602
 603     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 604 }
 605
 606 void qemu_purge_queued_packets(NetClientState *nc)
 607 {
 608     if (!nc->peer) {
 609         return;
 610     }
 611
 612     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 613 }
 614
 615 static
 616 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 617 {
 618     nc->receive_disabled = 0;
 619
 620     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 621         if (net_hub_flush(nc->peer)) {
 622             qemu_notify_event();
 623         }
 624     }
 625     if (qemu_net_queue_flush(nc->incoming_queue)) {
 626         /* We emptied the queue successfully, signal to the IO thread to repoll
 627          * the file descriptor (for tap, for example).
 628          */
 629         qemu_notify_event();
 630     } else if (purge) {
 631         /* Unable to empty the queue, purge remaining packets */
 632         qemu_net_queue_purge(nc->incoming_queue, nc);
 633     }
 634 }
 635
 636 void qemu_flush_queued_packets(NetClientState *nc)
 637 {
 638     qemu_flush_or_purge_queued_packets(nc, false);
 639 }
 640
 641 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 642                                                  unsigned flags,
 643                                                  const uint8_t *buf, int size,
 644                                                  NetPacketSent *sent_cb)
 645 {
 646     NetQueue *queue;
 647     int ret;
 648
 649 #ifdef DEBUG_NET
 650     printf("qemu_send_packet_async:\n");
 651     qemu_hexdump((const char *)buf, stdout, "net", size);
 652 #endif
 653
 654     if (sender->link_down || !sender->peer) {
 655         return size;
 656     }
 657
 658     /* Let filters handle the packet first */
 659     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 660                          sender, flags, buf, size, sent_cb);
 661     if (ret) {
 662         return ret;
 663     }
 664
 665     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 666                          sender, flags, buf, size, sent_cb);
 667     if (ret) {
 668         return ret;
 669     }
 670
 671     queue = sender->peer->incoming_queue;
 672
 673     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 674 }
 675
 676 ssize_t qemu_send_packet_async(NetClientState *sender,
 677                                const uint8_t *buf, int size,
 678                                NetPacketSent *sent_cb)
 679 {
 680     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 681                                              buf, size, sent_cb);
 682 }
 683
 684 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 685 {
 686     qemu_send_packet_async(nc, buf, size, NULL);
 687 }
 688
 689 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 690 {
 691     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 692                                              buf, size, NULL);
 693 }
 694
 695 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 696                                int iovcnt, unsigned flags)
 697 {
 698     uint8_t *buf = NULL;
 699     uint8_t *buffer;
 700     size_t offset;
 701     ssize_t ret;
 702
 703     if (iovcnt == 1) {
 704         buffer = iov[0].iov_base;
 705         offset = iov[0].iov_len;
 706     } else {
 707         offset = iov_size(iov, iovcnt);
 708         if (offset > NET_BUFSIZE) {
 709             return -1;
 710         }
 711         buf = g_malloc(offset);
 712         buffer = buf;
 713         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 714     }
 715
 716     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 717         ret = nc->info->receive_raw(nc, buffer, offset);
 718     } else {
 719         ret = nc->info->receive(nc, buffer, offset);
 720     }
 721
 722     g_free(buf);
 723     return ret;
 724 }
 725
 726 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 727                                 unsigned flags,
 728                                 const struct iovec *iov,
 729                                 int iovcnt,
 730                                 void *opaque)
 731 {
 732     NetClientState *nc = opaque;
 733     int ret;
 734
 735     if (nc->link_down) {
 736         return iov_size(iov, iovcnt);
 737     }
 738
 739     if (nc->receive_disabled) {
 740         return 0;
 741     }
 742
 743     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 744         ret = nc->info->receive_iov(nc, iov, iovcnt);
 745     } else {
 746         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 747     }
 748
 749     if (ret == 0) {
 750         nc->receive_disabled = 1;
 751     }
 752
 753     return ret;
 754 }
 755
 756 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 757                                 const struct iovec *iov, int iovcnt,
 758                                 NetPacketSent *sent_cb)
 759 {
 760     NetQueue *queue;
 761     int ret;
 762
 763     if (sender->link_down || !sender->peer) {
 764         return iov_size(iov, iovcnt);
 765     }
 766
 767     /* Let filters handle the packet first */
 768     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 769                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 770     if (ret) {
 771         return ret;
 772     }
 773
 774     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 775                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 776     if (ret) {
 777         return ret;
 778     }
 779
 780     queue = sender->peer->incoming_queue;
 781
 782     return qemu_net_queue_send_iov(queue, sender,
 783                                    QEMU_NET_PACKET_FLAG_NONE,
 784                                    iov, iovcnt, sent_cb);
 785 }
 786
 787 ssize_t
 788 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 789 {
 790     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 791 }
 792
 793 NetClientState *qemu_find_netdev(const char *id)
 794 {
 795     NetClientState *nc;
 796
 797     QTAILQ_FOREACH(nc, &net_clients, next) {
 798         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 799             continue;
 800         if (!strcmp(nc->name, id)) {
 801             return nc;
 802         }
 803     }
 804
 805     return NULL;
 806 }
 807
 808 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 809                                  NetClientDriver type, int max)
 810 {
 811     NetClientState *nc;
 812     int ret = 0;
 813
 814     QTAILQ_FOREACH(nc, &net_clients, next) {
 815         if (nc->info->type == type) {
 816             continue;
 817         }
 818         if (!id || !strcmp(nc->name, id)) {
 819             if (ret < max) {
 820                 ncs[ret] = nc;
 821             }
 822             ret++;
 823         }
 824     }
 825
 826     return ret;
 827 }
 828
 829 static int nic_get_free_idx(void)
 830 {
 831     int index;
 832
 833     for (index = 0; index < MAX_NICS; index++)
 834         if (!nd_table[index].used)
 835             return index;
 836     return -1;
 837 }
 838
 839 int qemu_show_nic_models(const char *arg, const char *const *models)
 840 {
 841     int i;
 842
 843     if (!arg || !is_help_option(arg)) {
 844         return 0;
 845     }
 846
 847     fprintf(stderr, "qemu: Supported NIC models: ");
 848     for (i = 0 ; models[i]; i++)
 849         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 850     return 1;
 851 }
 852
 853 void qemu_check_nic_model(NICInfo *nd, const char *model)
 854 {
 855     const char *models[2];
 856
 857     models[0] = model;
 858     models[1] = NULL;
 859
 860     if (qemu_show_nic_models(nd->model, models))
 861         exit(0);
 862     if (qemu_find_nic_model(nd, models, model) < 0)
 863         exit(1);
 864 }
 865
 866 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 867                         const char *default_model)
 868 {
 869     int i;
 870
 871     if (!nd->model)
 872         nd->model = g_strdup(default_model);
 873
 874     for (i = 0 ; models[i]; i++) {
 875         if (strcmp(nd->model, models[i]) == 0)
 876             return i;
 877     }
 878
 879     error_report("Unsupported NIC model: %s", nd->model);
 880     return -1;
 881 }
 882
 883 static int net_init_nic(const Netdev *netdev, const char *name,
 884                         NetClientState *peer, Error **errp)
 885 {
 886     int idx;
 887     NICInfo *nd;
 888     const NetLegacyNicOptions *nic;
 889
 890     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 891     nic = &netdev->u.nic;
 892
 893     idx = nic_get_free_idx();
 894     if (idx == -1 || nb_nics >= MAX_NICS) {
 895         error_setg(errp, "too many NICs");
 896         return -1;
 897     }
 898
 899     nd = &nd_table[idx];
 900
 901     memset(nd, 0, sizeof(*nd));
 902
 903     if (nic->has_netdev) {
 904         nd->netdev = qemu_find_netdev(nic->netdev);
 905         if (!nd->netdev) {
 906             error_setg(errp, "netdev '%s' not found", nic->netdev);
 907             return -1;
 908         }
 909     } else {
 910         assert(peer);
 911         nd->netdev = peer;
 912     }
 913     nd->name = g_strdup(name);
 914     if (nic->has_model) {
 915         nd->model = g_strdup(nic->model);
 916     }
 917     if (nic->has_addr) {
 918         nd->devaddr = g_strdup(nic->addr);
 919     }
 920
 921     if (nic->has_macaddr &&
 922         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 923         error_setg(errp, "invalid syntax for ethernet address");
 924         return -1;
 925     }
 926     if (nic->has_macaddr &&
 927         is_multicast_ether_addr(nd->macaddr.a)) {
 928         error_setg(errp,
 929                    "NIC cannot have multicast MAC address (odd 1st byte)");
 930         return -1;
 931     }
 932     qemu_macaddr_default_if_unset(&nd->macaddr);
 933
 934     if (nic->has_vectors) {
 935         if (nic->vectors > 0x7ffffff) {
 936             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 937             return -1;
 938         }
 939         nd->nvectors = nic->vectors;
 940     } else {
 941         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 942     }
 943
 944     nd->used = 1;
 945     nb_nics++;
 946
 947     return idx;
 948 }
 949
 950
 951 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 952     const Netdev *netdev,
 953     const char *name,
 954     NetClientState *peer, Error **errp) = {
 955         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 956 #ifdef CONFIG_SLIRP
 957         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 958 #endif
 959         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 960         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 961 #ifdef CONFIG_VDE
 962         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 963 #endif
 964 #ifdef CONFIG_NETMAP
 965         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 966 #endif
 967         [NET_CLIENT_DRIVER_DUMP]      = net_init_dump,
 968 #ifdef CONFIG_NET_BRIDGE
 969         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 970 #endif
 971         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 972 #ifdef CONFIG_VHOST_NET_USED
 973         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 974 #endif
 975 #ifdef CONFIG_L2TPV3
 976         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 977 #endif
 978 };
 979
 980
 981 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 982 {
 983     Netdev legacy = {0};
 984     const Netdev *netdev;
 985     const char *name;
 986     NetClientState *peer = NULL;
 987     static bool vlan_warned;
 988
 989     if (is_netdev) {
 990         netdev = object;
 991         name = netdev->id;
 992
 993         if (netdev->type == NET_CLIENT_DRIVER_DUMP ||
 994             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_DUMP:
1037             legacy.type = NET_CLIENT_DRIVER_DUMP;
1038             legacy.u.dump = opts->u.dump;
1039             break;
1040         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1041             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1042             legacy.u.bridge = opts->u.bridge;
1043             break;
1044         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1045             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1046             legacy.u.netmap = opts->u.netmap;
1047             break;
1048         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1049             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1050             legacy.u.vhost_user = opts->u.vhost_user;
1051             break;
1052         default:
1053             abort();
1054         }
1055
1056         if (!net_client_init_fun[netdev->type]) {
1057             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1058                        "a net backend type (maybe it is not compiled "
1059                        "into this binary)");
1060             return -1;
1061         }
1062
1063         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1064         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1065             !opts->u.nic.has_netdev) {
1066             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1067         }
1068
1069         if (net->has_vlan && !vlan_warned) {
1070             error_report("'vlan' is deprecated. Please use 'netdev' instead.");
1071             vlan_warned = true;
1072         }
1073     }
1074
1075     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1076         /* FIXME drop when all init functions store an Error */
1077         if (errp && !*errp) {
1078             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1079                        NetClientDriver_str(netdev->type));
1080         }
1081         return -1;
1082     }
1083     return 0;
1084 }
1085
1086
1087 int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1088 {
1089     void *object = NULL;
1090     Error *err = NULL;
1091     int ret = -1;
1092     Visitor *v = opts_visitor_new(opts);
1093
1094     {
1095         /* Parse convenience option format ip6-net=fec0::0[/64] */
1096         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1097
1098         if (ip6_net) {
1099             char buf[strlen(ip6_net) + 1];
1100
1101             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1102                 /* Default 64bit prefix length.  */
1103                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1104                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1105             } else {
1106                 /* User-specified prefix length.  */
1107                 unsigned long len;
1108                 int err;
1109
1110                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1111                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1112
1113                 if (err) {
1114                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1115                               "ipv6-prefix", "a number");
1116                 } else {
1117                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1118                                         &error_abort);
1119                 }
1120             }
1121             qemu_opt_unset(opts, "ipv6-net");
1122         }
1123     }
1124
1125     if (is_netdev) {
1126         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1127     } else {
1128         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1129     }
1130
1131     if (!err) {
1132         ret = net_client_init1(object, is_netdev, &err);
1133     }
1134
1135     if (is_netdev) {
1136         qapi_free_Netdev(object);
1137     } else {
1138         qapi_free_NetLegacy(object);
1139     }
1140
1141     error_propagate(errp, err);
1142     visit_free(v);
1143     return ret;
1144 }
1145
1146
1147 static int net_host_check_device(const char *device)
1148 {
1149     int i;
1150     for (i = 0; host_net_devices[i]; i++) {
1151         if (!strncmp(host_net_devices[i], device,
1152                      strlen(host_net_devices[i]))) {
1153             return 1;
1154         }
1155     }
1156
1157     return 0;
1158 }
1159
1160 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1161 {
1162     const char *device = qdict_get_str(qdict, "device");
1163     const char *opts_str = qdict_get_try_str(qdict, "opts");
1164     Error *local_err = NULL;
1165     QemuOpts *opts;
1166     static bool warned;
1167
1168     if (!warned && !qtest_enabled()) {
1169         error_report("host_net_add is deprecated, use netdev_add instead");
1170         warned = true;
1171     }
1172
1173     if (!net_host_check_device(device)) {
1174         monitor_printf(mon, "invalid host network device %s\n", device);
1175         return;
1176     }
1177
1178     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1179                                    opts_str ? opts_str : "", false);
1180     if (!opts) {
1181         return;
1182     }
1183
1184     qemu_opt_set(opts, "type", device, &error_abort);
1185
1186     net_client_init(opts, false, &local_err);
1187     if (local_err) {
1188         error_report_err(local_err);
1189         monitor_printf(mon, "adding host network device %s failed\n", device);
1190     }
1191 }
1192
1193 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1194 {
1195     NetClientState *nc;
1196     int vlan_id = qdict_get_int(qdict, "vlan_id");
1197     const char *device = qdict_get_str(qdict, "device");
1198     static bool warned;
1199
1200     if (!warned && !qtest_enabled()) {
1201         error_report("host_net_remove is deprecated, use netdev_del instead");
1202         warned = true;
1203     }
1204
1205     nc = net_hub_find_client_by_name(vlan_id, device);
1206     if (!nc) {
1207         error_report("Host network device '%s' on hub '%d' not found",
1208                      device, vlan_id);
1209         return;
1210     }
1211     if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1212         error_report("invalid host network device '%s'", device);
1213         return;
1214     }
1215
1216     qemu_del_net_client(nc->peer);
1217     qemu_del_net_client(nc);
1218     qemu_opts_del(qemu_opts_find(qemu_find_opts("net"), device));
1219 }
1220
1221 void netdev_add(QemuOpts *opts, Error **errp)
1222 {
1223     net_client_init(opts, true, errp);
1224 }
1225
1226 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1227 {
1228     Error *local_err = NULL;
1229     QemuOptsList *opts_list;
1230     QemuOpts *opts;
1231
1232     opts_list = qemu_find_opts_err("netdev", &local_err);
1233     if (local_err) {
1234         goto out;
1235     }
1236
1237     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1238     if (local_err) {
1239         goto out;
1240     }
1241
1242     netdev_add(opts, &local_err);
1243     if (local_err) {
1244         qemu_opts_del(opts);
1245         goto out;
1246     }
1247
1248 out:
1249     error_propagate(errp, local_err);
1250 }
1251
1252 void qmp_netdev_del(const char *id, Error **errp)
1253 {
1254     NetClientState *nc;
1255     QemuOpts *opts;
1256
1257     nc = qemu_find_netdev(id);
1258     if (!nc) {
1259         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1260                   "Device '%s' not found", id);
1261         return;
1262     }
1263
1264     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1265     if (!opts) {
1266         error_setg(errp, "Device '%s' is not a netdev", id);
1267         return;
1268     }
1269
1270     qemu_del_net_client(nc);
1271     qemu_opts_del(opts);
1272 }
1273
1274 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1275 {
1276     char *str;
1277     ObjectProperty *prop;
1278     ObjectPropertyIterator iter;
1279     Visitor *v;
1280
1281     /* generate info str */
1282     object_property_iter_init(&iter, OBJECT(nf));
1283     while ((prop = object_property_iter_next(&iter))) {
1284         if (!strcmp(prop->name, "type")) {
1285             continue;
1286         }
1287         v = string_output_visitor_new(false, &str);
1288         object_property_get(OBJECT(nf), v, prop->name, NULL);
1289         visit_complete(v, &str);
1290         visit_free(v);
1291         monitor_printf(mon, ",%s=%s", prop->name, str);
1292         g_free(str);
1293     }
1294     monitor_printf(mon, "\n");
1295 }
1296
1297 void print_net_client(Monitor *mon, NetClientState *nc)
1298 {
1299     NetFilterState *nf;
1300
1301     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1302                    nc->queue_index,
1303                    NetClientDriver_str(nc->info->type),
1304                    nc->info_str);
1305     if (!QTAILQ_EMPTY(&nc->filters)) {
1306         monitor_printf(mon, "filters:\n");
1307     }
1308     QTAILQ_FOREACH(nf, &nc->filters, next) {
1309         char *path = object_get_canonical_path_component(OBJECT(nf));
1310
1311         monitor_printf(mon, "  - %s: type=%s", path,
1312                        object_get_typename(OBJECT(nf)));
1313         netfilter_print_info(mon, nf);
1314         g_free(path);
1315     }
1316 }
1317
1318 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1319                                       Error **errp)
1320 {
1321     NetClientState *nc;
1322     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1323
1324     QTAILQ_FOREACH(nc, &net_clients, next) {
1325         RxFilterInfoList *entry;
1326         RxFilterInfo *info;
1327
1328         if (has_name && strcmp(nc->name, name) != 0) {
1329             continue;
1330         }
1331
1332         /* only query rx-filter information of NIC */
1333         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1334             if (has_name) {
1335                 error_setg(errp, "net client(%s) isn't a NIC", name);
1336                 return NULL;
1337             }
1338             continue;
1339         }
1340
1341         /* only query information on queue 0 since the info is per nic,
1342          * not per queue
1343          */
1344         if (nc->queue_index != 0)
1345             continue;
1346
1347         if (nc->info->query_rx_filter) {
1348             info = nc->info->query_rx_filter(nc);
1349             entry = g_malloc0(sizeof(*entry));
1350             entry->value = info;
1351
1352             if (!filter_list) {
1353                 filter_list = entry;
1354             } else {
1355                 last_entry->next = entry;
1356             }
1357             last_entry = entry;
1358         } else if (has_name) {
1359             error_setg(errp, "net client(%s) doesn't support"
1360                        " rx-filter querying", name);
1361             return NULL;
1362         }
1363
1364         if (has_name) {
1365             break;
1366         }
1367     }
1368
1369     if (filter_list == NULL && has_name) {
1370         error_setg(errp, "invalid net client name: %s", name);
1371     }
1372
1373     return filter_list;
1374 }
1375
1376 void hmp_info_network(Monitor *mon, const QDict *qdict)
1377 {
1378     NetClientState *nc, *peer;
1379     NetClientDriver type;
1380
1381     net_hub_info(mon);
1382
1383     QTAILQ_FOREACH(nc, &net_clients, next) {
1384         peer = nc->peer;
1385         type = nc->info->type;
1386
1387         /* Skip if already printed in hub info */
1388         if (net_hub_id_for_client(nc, NULL) == 0) {
1389             continue;
1390         }
1391
1392         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1393             print_net_client(mon, nc);
1394         } /* else it's a netdev connected to a NIC, printed with the NIC */
1395         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1396             monitor_printf(mon, " \\ ");
1397             print_net_client(mon, peer);
1398         }
1399     }
1400 }
1401
1402 void qmp_set_link(const char *name, bool up, Error **errp)
1403 {
1404     NetClientState *ncs[MAX_QUEUE_NUM];
1405     NetClientState *nc;
1406     int queues, i;
1407
1408     queues = qemu_find_net_clients_except(name, ncs,
1409                                           NET_CLIENT_DRIVER__MAX,
1410                                           MAX_QUEUE_NUM);
1411
1412     if (queues == 0) {
1413         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1414                   "Device '%s' not found", name);
1415         return;
1416     }
1417     nc = ncs[0];
1418
1419     for (i = 0; i < queues; i++) {
1420         ncs[i]->link_down = !up;
1421     }
1422
1423     if (nc->info->link_status_changed) {
1424         nc->info->link_status_changed(nc);
1425     }
1426
1427     if (nc->peer) {
1428         /* Change peer link only if the peer is NIC and then notify peer.
1429          * If the peer is a HUBPORT or a backend, we do not change the
1430          * link status.
1431          *
1432          * This behavior is compatible with qemu vlans where there could be
1433          * multiple clients that can still communicate with each other in
1434          * disconnected mode. For now maintain this compatibility.
1435          */
1436         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1437             for (i = 0; i < queues; i++) {
1438                 ncs[i]->peer->link_down = !up;
1439             }
1440         }
1441         if (nc->peer->info->link_status_changed) {
1442             nc->peer->info->link_status_changed(nc->peer);
1443         }
1444     }
1445 }
1446
1447 static void net_vm_change_state_handler(void *opaque, int running,
1448                                         RunState state)
1449 {
1450     NetClientState *nc;
1451     NetClientState *tmp;
1452
1453     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1454         if (running) {
1455             /* Flush queued packets and wake up backends. */
1456             if (nc->peer && qemu_can_send_packet(nc)) {
1457                 qemu_flush_queued_packets(nc->peer);
1458             }
1459         } else {
1460             /* Complete all queued packets, to guarantee we don't modify
1461              * state later when VM is not running.
1462              */
1463             qemu_flush_or_purge_queued_packets(nc, true);
1464         }
1465     }
1466 }
1467
1468 void net_cleanup(void)
1469 {
1470     NetClientState *nc;
1471
1472     /* We may del multiple entries during qemu_del_net_client(),
1473      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1474      */
1475     while (!QTAILQ_EMPTY(&net_clients)) {
1476         nc = QTAILQ_FIRST(&net_clients);
1477         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1478             qemu_del_nic(qemu_get_nic(nc));
1479         } else {
1480             qemu_del_net_client(nc);
1481         }
1482     }
1483
1484     qemu_del_vm_change_state_handler(net_change_state_entry);
1485 }
1486
1487 void net_check_clients(void)
1488 {
1489     NetClientState *nc;
1490     int i;
1491
1492     net_hub_check_clients();
1493
1494     QTAILQ_FOREACH(nc, &net_clients, next) {
1495         if (!nc->peer) {
1496             warn_report("%s %s has no peer",
1497                         nc->info->type == NET_CLIENT_DRIVER_NIC
1498                         ? "nic" : "netdev",
1499                         nc->name);
1500         }
1501     }
1502
1503     /* Check that all NICs requested via -net nic actually got created.
1504      * NICs created via -device don't need to be checked here because
1505      * they are always instantiated.
1506      */
1507     for (i = 0; i < MAX_NICS; i++) {
1508         NICInfo *nd = &nd_table[i];
1509         if (nd->used && !nd->instantiated) {
1510             warn_report("requested NIC (%s, model %s) "
1511                         "was not created (not supported by this machine?)",
1512                         nd->name ? nd->name : "anonymous",
1513                         nd->model ? nd->model : "unspecified");
1514         }
1515     }
1516 }
1517
1518 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1519 {
1520     Error *local_err = NULL;
1521
1522     net_client_init(opts, false, &local_err);
1523     if (local_err) {
1524         error_report_err(local_err);
1525         return -1;
1526     }
1527
1528     return 0;
1529 }
1530
1531 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1532 {
1533     Error *local_err = NULL;
1534     int ret;
1535
1536     ret = net_client_init(opts, true, &local_err);
1537     if (local_err) {
1538         error_report_err(local_err);
1539         return -1;
1540     }
1541
1542     return ret;
1543 }
1544
1545 int net_init_clients(void)
1546 {
1547     QemuOptsList *net = qemu_find_opts("net");
1548
1549     net_change_state_entry =
1550         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1551
1552     QTAILQ_INIT(&net_clients);
1553
1554     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1555                           net_init_netdev, NULL, NULL)) {
1556         return -1;
1557     }
1558
1559     if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1560         return -1;
1561     }
1562
1563     return 0;
1564 }
1565
1566 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1567 {
1568 #if defined(CONFIG_SLIRP)
1569     int ret;
1570     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1571         return ret;
1572     }
1573 #endif
1574
1575     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1576         return -1;
1577     }
1578
1579     return 0;
1580 }
1581
1582 /* From FreeBSD */
1583 /* XXX: optimize */
1584 unsigned compute_mcast_idx(const uint8_t *ep)
1585 {
1586     uint32_t crc;
1587     int carry, i, j;
1588     uint8_t b;
1589
1590     crc = 0xffffffff;
1591     for (i = 0; i < 6; i++) {
1592         b = *ep++;
1593         for (j = 0; j < 8; j++) {
1594             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1595             crc <<= 1;
1596             b >>= 1;
1597             if (carry) {
1598                 crc = ((crc ^ POLYNOMIAL) | carry);
1599             }
1600         }
1601     }
1602     return crc >> 26;
1603 }
1604
1605 QemuOptsList qemu_netdev_opts = {
1606     .name = "netdev",
1607     .implied_opt_name = "type",
1608     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1609     .desc = {
1610         /*
1611          * no elements => accept any params
1612          * validation will happen later
1613          */
1614         { /* end of list */ }
1615     },
1616 };
1617
1618 QemuOptsList qemu_net_opts = {
1619     .name = "net",
1620     .implied_opt_name = "type",
1621     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1622     .desc = {
1623         /*
1624          * no elements => accept any params
1625          * validation will happen later
1626          */
1627         { /* end of list */ }
1628     },
1629 };
1630
1631 void net_socket_rs_init(SocketReadState *rs,
1632                         SocketReadStateFinalize *finalize,
1633                         bool vnet_hdr)
1634 {
1635     rs->state = 0;
1636     rs->vnet_hdr = vnet_hdr;
1637     rs->index = 0;
1638     rs->packet_len = 0;
1639     rs->vnet_hdr_len = 0;
1640     memset(rs->buf, 0, sizeof(rs->buf));
1641     rs->finalize = finalize;
1642 }
1643
1644 /*
1645  * Returns
1646  * 0: success
1647  * -1: error occurs
1648  */
1649 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1650 {
1651     unsigned int l;
1652
1653     while (size > 0) {
1654         /* Reassemble a packet from the network.
1655          * 0 = getting length.
1656          * 1 = getting vnet header length.
1657          * 2 = getting data.
1658          */
1659         switch (rs->state) {
1660         case 0:
1661             l = 4 - rs->index;
1662             if (l > size) {
1663                 l = size;
1664             }
1665             memcpy(rs->buf + rs->index, buf, l);
1666             buf += l;
1667             size -= l;
1668             rs->index += l;
1669             if (rs->index == 4) {
1670                 /* got length */
1671                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1672                 rs->index = 0;
1673                 if (rs->vnet_hdr) {
1674                     rs->state = 1;
1675                 } else {
1676                     rs->state = 2;
1677                     rs->vnet_hdr_len = 0;
1678                 }
1679             }
1680             break;
1681         case 1:
1682             l = 4 - rs->index;
1683             if (l > size) {
1684                 l = size;
1685             }
1686             memcpy(rs->buf + rs->index, buf, l);
1687             buf += l;
1688             size -= l;
1689             rs->index += l;
1690             if (rs->index == 4) {
1691                 /* got vnet header length */
1692                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1693                 rs->index = 0;
1694                 rs->state = 2;
1695             }
1696             break;
1697         case 2:
1698             l = rs->packet_len - rs->index;
1699             if (l > size) {
1700                 l = size;
1701             }
1702             if (rs->index + l <= sizeof(rs->buf)) {
1703                 memcpy(rs->buf + rs->index, buf, l);
1704             } else {
1705                 fprintf(stderr, "serious error: oversized packet received,"
1706                     "connection terminated.\n");
1707                 rs->index = rs->state = 0;
1708                 return -1;
1709             }
1710
1711             rs->index += l;
1712             buf += l;
1713             size -= l;
1714             if (rs->index >= rs->packet_len) {
1715                 rs->index = 0;
1716                 rs->state = 0;
1717                 assert(rs->finalize);
1718                 rs->finalize(rs);
1719             }
1720             break;
1721         }
1722     }
1723
1724     assert(size == 0);
1725     return 0;
1726 }