net/net.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26
  27 #include "net/net.h"
  28 #include "clients.h"
  29 #include "hub.h"
  30 #include "hw/qdev-properties.h"
  31 #include "net/slirp.h"
  32 #include "net/eth.h"
  33 #include "util.h"
  34
  35 #include "monitor/monitor.h"
  36 #include "qemu/help_option.h"
  37 #include "qapi/qapi-commands-net.h"
  38 #include "qapi/qapi-visit-net.h"
  39 #include "qapi/qmp/qdict.h"
  40 #include "qapi/qmp/qerror.h"
  41 #include "qemu/error-report.h"
  42 #include "qemu/sockets.h"
  43 #include "qemu/cutils.h"
  44 #include "qemu/config-file.h"
  45 #include "qemu/ctype.h"
  46 #include "qemu/id.h"
  47 #include "qemu/iov.h"
  48 #include "qemu/qemu-print.h"
  49 #include "qemu/main-loop.h"
  50 #include "qemu/option.h"
  51 #include "qemu/keyval.h"
  52 #include "qapi/error.h"
  53 #include "qapi/opts-visitor.h"
  54 #include "sysemu/runstate.h"
  55 #include "net/colo-compare.h"
  56 #include "net/filter.h"
  57 #include "qapi/string-output-visitor.h"
  58 #include "qapi/qobject-input-visitor.h"
  59
  60 /* Net bridge is currently not supported for W32. */
  61 #if !defined(_WIN32)
  62 # define CONFIG_NET_BRIDGE
  63 #endif
  64
  65 static VMChangeStateEntry *net_change_state_entry;
  66 NetClientStateList net_clients;
  67
  68 typedef struct NetdevQueueEntry {
  69     Netdev *nd;
  70     Location loc;
  71     QSIMPLEQ_ENTRY(NetdevQueueEntry) entry;
  72 } NetdevQueueEntry;
  73
  74 typedef QSIMPLEQ_HEAD(, NetdevQueueEntry) NetdevQueue;
  75
  76 static NetdevQueue nd_queue = QSIMPLEQ_HEAD_INITIALIZER(nd_queue);
  77
  78 /***********************************************************/
  79 /* network device redirectors */
  80
  81 int convert_host_port(struct sockaddr_in *saddr, const char *host,
  82                       const char *port, Error **errp)
  83 {
  84     struct hostent *he;
  85     const char *r;
  86     long p;
  87
  88     memset(saddr, 0, sizeof(*saddr));
  89
  90     saddr->sin_family = AF_INET;
  91     if (host[0] == '\0') {
  92         saddr->sin_addr.s_addr = 0;
  93     } else {
  94         if (qemu_isdigit(host[0])) {
  95             if (!inet_aton(host, &saddr->sin_addr)) {
  96                 error_setg(errp, "host address '%s' is not a valid "
  97                            "IPv4 address", host);
  98                 return -1;
  99             }
 100         } else {
 101             he = gethostbyname(host);
 102             if (he == NULL) {
 103                 error_setg(errp, "can't resolve host address '%s'", host);
 104                 return -1;
 105             }
 106             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 107         }
 108     }
 109     if (qemu_strtol(port, &r, 0, &p) != 0) {
 110         error_setg(errp, "port number '%s' is invalid", port);
 111         return -1;
 112     }
 113     saddr->sin_port = htons(p);
 114     return 0;
 115 }
 116
 117 int parse_host_port(struct sockaddr_in *saddr, const char *str,
 118                     Error **errp)
 119 {
 120     gchar **substrings;
 121     int ret;
 122
 123     substrings = g_strsplit(str, ":", 2);
 124     if (!substrings || !substrings[0] || !substrings[1]) {
 125         error_setg(errp, "host address '%s' doesn't contain ':' "
 126                    "separating host from port", str);
 127         ret = -1;
 128         goto out;
 129     }
 130
 131     ret = convert_host_port(saddr, substrings[0], substrings[1], errp);
 132
 133 out:
 134     g_strfreev(substrings);
 135     return ret;
 136 }
 137
 138 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 139 {
 140     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 141                            macaddr[0], macaddr[1], macaddr[2],
 142                            macaddr[3], macaddr[4], macaddr[5]);
 143 }
 144
 145 void qemu_set_info_str(NetClientState *nc, const char *fmt, ...)
 146 {
 147     va_list ap;
 148
 149     va_start(ap, fmt);
 150     vsnprintf(nc->info_str, sizeof(nc->info_str), fmt, ap);
 151     va_end(ap);
 152 }
 153
 154 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 155 {
 156     qemu_set_info_str(nc, "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 157                       nc->model, 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 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 252                                        unsigned flags,
 253                                        const struct iovec *iov,
 254                                        int iovcnt,
 255                                        void *opaque);
 256
 257 static void qemu_net_client_setup(NetClientState *nc,
 258                                   NetClientInfo *info,
 259                                   NetClientState *peer,
 260                                   const char *model,
 261                                   const char *name,
 262                                   NetClientDestructor *destructor,
 263                                   bool is_datapath)
 264 {
 265     nc->info = info;
 266     nc->model = g_strdup(model);
 267     if (name) {
 268         nc->name = g_strdup(name);
 269     } else {
 270         nc->name = assign_name(nc, model);
 271     }
 272
 273     if (peer) {
 274         assert(!peer->peer);
 275         nc->peer = peer;
 276         peer->peer = nc;
 277     }
 278     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 279
 280     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 281     nc->destructor = destructor;
 282     nc->is_datapath = is_datapath;
 283     QTAILQ_INIT(&nc->filters);
 284 }
 285
 286 NetClientState *qemu_new_net_client(NetClientInfo *info,
 287                                     NetClientState *peer,
 288                                     const char *model,
 289                                     const char *name)
 290 {
 291     NetClientState *nc;
 292
 293     assert(info->size >= sizeof(NetClientState));
 294
 295     nc = g_malloc0(info->size);
 296     qemu_net_client_setup(nc, info, peer, model, name,
 297                           qemu_net_client_destructor, true);
 298
 299     return nc;
 300 }
 301
 302 NetClientState *qemu_new_net_control_client(NetClientInfo *info,
 303                                             NetClientState *peer,
 304                                             const char *model,
 305                                             const char *name)
 306 {
 307     NetClientState *nc;
 308
 309     assert(info->size >= sizeof(NetClientState));
 310
 311     nc = g_malloc0(info->size);
 312     qemu_net_client_setup(nc, info, peer, model, name,
 313                           qemu_net_client_destructor, false);
 314
 315     return nc;
 316 }
 317
 318 NICState *qemu_new_nic(NetClientInfo *info,
 319                        NICConf *conf,
 320                        const char *model,
 321                        const char *name,
 322                        void *opaque)
 323 {
 324     NetClientState **peers = conf->peers.ncs;
 325     NICState *nic;
 326     int i, queues = MAX(1, conf->peers.queues);
 327
 328     assert(info->type == NET_CLIENT_DRIVER_NIC);
 329     assert(info->size >= sizeof(NICState));
 330
 331     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 332     nic->ncs = (void *)nic + info->size;
 333     nic->conf = conf;
 334     nic->opaque = opaque;
 335
 336     for (i = 0; i < queues; i++) {
 337         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 338                               NULL, true);
 339         nic->ncs[i].queue_index = i;
 340     }
 341
 342     return nic;
 343 }
 344
 345 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 346 {
 347     return nic->ncs + queue_index;
 348 }
 349
 350 NetClientState *qemu_get_queue(NICState *nic)
 351 {
 352     return qemu_get_subqueue(nic, 0);
 353 }
 354
 355 NICState *qemu_get_nic(NetClientState *nc)
 356 {
 357     NetClientState *nc0 = nc - nc->queue_index;
 358
 359     return (NICState *)((void *)nc0 - nc->info->size);
 360 }
 361
 362 void *qemu_get_nic_opaque(NetClientState *nc)
 363 {
 364     NICState *nic = qemu_get_nic(nc);
 365
 366     return nic->opaque;
 367 }
 368
 369 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
 370 {
 371     assert(nc != NULL);
 372     NetClientState *ncs = nc + queue_index;
 373     return ncs->peer;
 374 }
 375
 376 static void qemu_cleanup_net_client(NetClientState *nc)
 377 {
 378     QTAILQ_REMOVE(&net_clients, nc, next);
 379
 380     if (nc->info->cleanup) {
 381         nc->info->cleanup(nc);
 382     }
 383 }
 384
 385 static void qemu_free_net_client(NetClientState *nc)
 386 {
 387     if (nc->incoming_queue) {
 388         qemu_del_net_queue(nc->incoming_queue);
 389     }
 390     if (nc->peer) {
 391         nc->peer->peer = NULL;
 392     }
 393     g_free(nc->name);
 394     g_free(nc->model);
 395     if (nc->destructor) {
 396         nc->destructor(nc);
 397     }
 398 }
 399
 400 void qemu_del_net_client(NetClientState *nc)
 401 {
 402     NetClientState *ncs[MAX_QUEUE_NUM];
 403     int queues, i;
 404     NetFilterState *nf, *next;
 405
 406     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 407
 408     /* If the NetClientState belongs to a multiqueue backend, we will change all
 409      * other NetClientStates also.
 410      */
 411     queues = qemu_find_net_clients_except(nc->name, ncs,
 412                                           NET_CLIENT_DRIVER_NIC,
 413                                           MAX_QUEUE_NUM);
 414     assert(queues != 0);
 415
 416     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 417         object_unparent(OBJECT(nf));
 418     }
 419
 420     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 421     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 422         NICState *nic = qemu_get_nic(nc->peer);
 423         if (nic->peer_deleted) {
 424             return;
 425         }
 426         nic->peer_deleted = true;
 427
 428         for (i = 0; i < queues; i++) {
 429             ncs[i]->peer->link_down = true;
 430         }
 431
 432         if (nc->peer->info->link_status_changed) {
 433             nc->peer->info->link_status_changed(nc->peer);
 434         }
 435
 436         for (i = 0; i < queues; i++) {
 437             qemu_cleanup_net_client(ncs[i]);
 438         }
 439
 440         return;
 441     }
 442
 443     for (i = 0; i < queues; i++) {
 444         qemu_cleanup_net_client(ncs[i]);
 445         qemu_free_net_client(ncs[i]);
 446     }
 447 }
 448
 449 void qemu_del_nic(NICState *nic)
 450 {
 451     int i, queues = MAX(nic->conf->peers.queues, 1);
 452
 453     qemu_macaddr_set_free(&nic->conf->macaddr);
 454
 455     for (i = 0; i < queues; i++) {
 456         NetClientState *nc = qemu_get_subqueue(nic, i);
 457         /* If this is a peer NIC and peer has already been deleted, free it now. */
 458         if (nic->peer_deleted) {
 459             qemu_free_net_client(nc->peer);
 460         } else if (nc->peer) {
 461             /* if there are RX packets pending, complete them */
 462             qemu_purge_queued_packets(nc->peer);
 463         }
 464     }
 465
 466     for (i = queues - 1; i >= 0; i--) {
 467         NetClientState *nc = qemu_get_subqueue(nic, i);
 468
 469         qemu_cleanup_net_client(nc);
 470         qemu_free_net_client(nc);
 471     }
 472
 473     g_free(nic);
 474 }
 475
 476 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 477 {
 478     NetClientState *nc;
 479
 480     QTAILQ_FOREACH(nc, &net_clients, next) {
 481         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 482             if (nc->queue_index == 0) {
 483                 func(qemu_get_nic(nc), opaque);
 484             }
 485         }
 486     }
 487 }
 488
 489 bool qemu_has_ufo(NetClientState *nc)
 490 {
 491     if (!nc || !nc->info->has_ufo) {
 492         return false;
 493     }
 494
 495     return nc->info->has_ufo(nc);
 496 }
 497
 498 bool qemu_has_uso(NetClientState *nc)
 499 {
 500     if (!nc || !nc->info->has_uso) {
 501         return false;
 502     }
 503
 504     return nc->info->has_uso(nc);
 505 }
 506
 507 bool qemu_has_vnet_hdr(NetClientState *nc)
 508 {
 509     if (!nc || !nc->info->has_vnet_hdr) {
 510         return false;
 511     }
 512
 513     return nc->info->has_vnet_hdr(nc);
 514 }
 515
 516 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 517 {
 518     if (!nc || !nc->info->has_vnet_hdr_len) {
 519         return false;
 520     }
 521
 522     return nc->info->has_vnet_hdr_len(nc, len);
 523 }
 524
 525 bool qemu_get_using_vnet_hdr(NetClientState *nc)
 526 {
 527     if (!nc || !nc->info->get_using_vnet_hdr) {
 528         return false;
 529     }
 530
 531     return nc->info->get_using_vnet_hdr(nc);
 532 }
 533
 534 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 535 {
 536     if (!nc || !nc->info->using_vnet_hdr) {
 537         return;
 538     }
 539
 540     nc->info->using_vnet_hdr(nc, enable);
 541 }
 542
 543 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 544                           int ecn, int ufo, int uso4, int uso6)
 545 {
 546     if (!nc || !nc->info->set_offload) {
 547         return;
 548     }
 549
 550     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo, uso4, uso6);
 551 }
 552
 553 int qemu_get_vnet_hdr_len(NetClientState *nc)
 554 {
 555     if (!nc || !nc->info->get_vnet_hdr_len) {
 556         return 0;
 557     }
 558
 559     return nc->info->get_vnet_hdr_len(nc);
 560 }
 561
 562 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 563 {
 564     if (!nc || !nc->info->set_vnet_hdr_len) {
 565         return;
 566     }
 567
 568     nc->vnet_hdr_len = len;
 569     nc->info->set_vnet_hdr_len(nc, len);
 570 }
 571
 572 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 573 {
 574 #if HOST_BIG_ENDIAN
 575     if (!nc || !nc->info->set_vnet_le) {
 576         return -ENOSYS;
 577     }
 578
 579     return nc->info->set_vnet_le(nc, is_le);
 580 #else
 581     return 0;
 582 #endif
 583 }
 584
 585 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 586 {
 587 #if HOST_BIG_ENDIAN
 588     return 0;
 589 #else
 590     if (!nc || !nc->info->set_vnet_be) {
 591         return -ENOSYS;
 592     }
 593
 594     return nc->info->set_vnet_be(nc, is_be);
 595 #endif
 596 }
 597
 598 int qemu_can_receive_packet(NetClientState *nc)
 599 {
 600     if (nc->receive_disabled) {
 601         return 0;
 602     } else if (nc->info->can_receive &&
 603                !nc->info->can_receive(nc)) {
 604         return 0;
 605     }
 606     return 1;
 607 }
 608
 609 int qemu_can_send_packet(NetClientState *sender)
 610 {
 611     int vm_running = runstate_is_running();
 612
 613     if (!vm_running) {
 614         return 0;
 615     }
 616
 617     if (!sender->peer) {
 618         return 1;
 619     }
 620
 621     return qemu_can_receive_packet(sender->peer);
 622 }
 623
 624 static ssize_t filter_receive_iov(NetClientState *nc,
 625                                   NetFilterDirection direction,
 626                                   NetClientState *sender,
 627                                   unsigned flags,
 628                                   const struct iovec *iov,
 629                                   int iovcnt,
 630                                   NetPacketSent *sent_cb)
 631 {
 632     ssize_t ret = 0;
 633     NetFilterState *nf = NULL;
 634
 635     if (direction == NET_FILTER_DIRECTION_TX) {
 636         QTAILQ_FOREACH(nf, &nc->filters, next) {
 637             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 638                                          iovcnt, sent_cb);
 639             if (ret) {
 640                 return ret;
 641             }
 642         }
 643     } else {
 644         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 645             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 646                                          iovcnt, sent_cb);
 647             if (ret) {
 648                 return ret;
 649             }
 650         }
 651     }
 652
 653     return ret;
 654 }
 655
 656 static ssize_t filter_receive(NetClientState *nc,
 657                               NetFilterDirection direction,
 658                               NetClientState *sender,
 659                               unsigned flags,
 660                               const uint8_t *data,
 661                               size_t size,
 662                               NetPacketSent *sent_cb)
 663 {
 664     struct iovec iov = {
 665         .iov_base = (void *)data,
 666         .iov_len = size
 667     };
 668
 669     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 670 }
 671
 672 void qemu_purge_queued_packets(NetClientState *nc)
 673 {
 674     if (!nc->peer) {
 675         return;
 676     }
 677
 678     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 679 }
 680
 681 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 682 {
 683     nc->receive_disabled = 0;
 684
 685     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 686         if (net_hub_flush(nc->peer)) {
 687             qemu_notify_event();
 688         }
 689     }
 690     if (qemu_net_queue_flush(nc->incoming_queue)) {
 691         /* We emptied the queue successfully, signal to the IO thread to repoll
 692          * the file descriptor (for tap, for example).
 693          */
 694         qemu_notify_event();
 695     } else if (purge) {
 696         /* Unable to empty the queue, purge remaining packets */
 697         qemu_net_queue_purge(nc->incoming_queue, nc->peer);
 698     }
 699 }
 700
 701 void qemu_flush_queued_packets(NetClientState *nc)
 702 {
 703     qemu_flush_or_purge_queued_packets(nc, false);
 704 }
 705
 706 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 707                                                  unsigned flags,
 708                                                  const uint8_t *buf, int size,
 709                                                  NetPacketSent *sent_cb)
 710 {
 711     NetQueue *queue;
 712     int ret;
 713
 714 #ifdef DEBUG_NET
 715     printf("qemu_send_packet_async:\n");
 716     qemu_hexdump(stdout, "net", buf, size);
 717 #endif
 718
 719     if (sender->link_down || !sender->peer) {
 720         return size;
 721     }
 722
 723     /* Let filters handle the packet first */
 724     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 725                          sender, flags, buf, size, sent_cb);
 726     if (ret) {
 727         return ret;
 728     }
 729
 730     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 731                          sender, flags, buf, size, sent_cb);
 732     if (ret) {
 733         return ret;
 734     }
 735
 736     queue = sender->peer->incoming_queue;
 737
 738     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 739 }
 740
 741 ssize_t qemu_send_packet_async(NetClientState *sender,
 742                                const uint8_t *buf, int size,
 743                                NetPacketSent *sent_cb)
 744 {
 745     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 746                                              buf, size, sent_cb);
 747 }
 748
 749 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 750 {
 751     return qemu_send_packet_async(nc, buf, size, NULL);
 752 }
 753
 754 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size)
 755 {
 756     if (!qemu_can_receive_packet(nc)) {
 757         return 0;
 758     }
 759
 760     return qemu_net_queue_receive(nc->incoming_queue, buf, size);
 761 }
 762
 763 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov,
 764                                 int iovcnt)
 765 {
 766     if (!qemu_can_receive_packet(nc)) {
 767         return 0;
 768     }
 769
 770     return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt);
 771 }
 772
 773 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 774 {
 775     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 776                                              buf, size, NULL);
 777 }
 778
 779 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 780                                int iovcnt, unsigned flags)
 781 {
 782     uint8_t *buf = NULL;
 783     uint8_t *buffer;
 784     size_t offset;
 785     ssize_t ret;
 786
 787     if (iovcnt == 1) {
 788         buffer = iov[0].iov_base;
 789         offset = iov[0].iov_len;
 790     } else {
 791         offset = iov_size(iov, iovcnt);
 792         if (offset > NET_BUFSIZE) {
 793             return -1;
 794         }
 795         buf = g_malloc(offset);
 796         buffer = buf;
 797         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 798     }
 799
 800     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 801         ret = nc->info->receive_raw(nc, buffer, offset);
 802     } else {
 803         ret = nc->info->receive(nc, buffer, offset);
 804     }
 805
 806     g_free(buf);
 807     return ret;
 808 }
 809
 810 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 811                                        unsigned flags,
 812                                        const struct iovec *iov,
 813                                        int iovcnt,
 814                                        void *opaque)
 815 {
 816     NetClientState *nc = opaque;
 817     int ret;
 818
 819
 820     if (nc->link_down) {
 821         return iov_size(iov, iovcnt);
 822     }
 823
 824     if (nc->receive_disabled) {
 825         return 0;
 826     }
 827
 828     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 829         ret = nc->info->receive_iov(nc, iov, iovcnt);
 830     } else {
 831         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 832     }
 833
 834     if (ret == 0) {
 835         nc->receive_disabled = 1;
 836     }
 837
 838     return ret;
 839 }
 840
 841 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 842                                 const struct iovec *iov, int iovcnt,
 843                                 NetPacketSent *sent_cb)
 844 {
 845     NetQueue *queue;
 846     size_t size = iov_size(iov, iovcnt);
 847     int ret;
 848
 849     if (size > NET_BUFSIZE) {
 850         return size;
 851     }
 852
 853     if (sender->link_down || !sender->peer) {
 854         return size;
 855     }
 856
 857     /* Let filters handle the packet first */
 858     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 859                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 860     if (ret) {
 861         return ret;
 862     }
 863
 864     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 865                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 866     if (ret) {
 867         return ret;
 868     }
 869
 870     queue = sender->peer->incoming_queue;
 871
 872     return qemu_net_queue_send_iov(queue, sender,
 873                                    QEMU_NET_PACKET_FLAG_NONE,
 874                                    iov, iovcnt, sent_cb);
 875 }
 876
 877 ssize_t
 878 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 879 {
 880     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 881 }
 882
 883 NetClientState *qemu_find_netdev(const char *id)
 884 {
 885     NetClientState *nc;
 886
 887     QTAILQ_FOREACH(nc, &net_clients, next) {
 888         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 889             continue;
 890         if (!strcmp(nc->name, id)) {
 891             return nc;
 892         }
 893     }
 894
 895     return NULL;
 896 }
 897
 898 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 899                                  NetClientDriver type, int max)
 900 {
 901     NetClientState *nc;
 902     int ret = 0;
 903
 904     QTAILQ_FOREACH(nc, &net_clients, next) {
 905         if (nc->info->type == type) {
 906             continue;
 907         }
 908         if (!id || !strcmp(nc->name, id)) {
 909             if (ret < max) {
 910                 ncs[ret] = nc;
 911             }
 912             ret++;
 913         }
 914     }
 915
 916     return ret;
 917 }
 918
 919 static int nic_get_free_idx(void)
 920 {
 921     int index;
 922
 923     for (index = 0; index < MAX_NICS; index++)
 924         if (!nd_table[index].used)
 925             return index;
 926     return -1;
 927 }
 928
 929 GPtrArray *qemu_get_nic_models(const char *device_type)
 930 {
 931     GPtrArray *nic_models = g_ptr_array_new();
 932     GSList *list = object_class_get_list_sorted(device_type, false);
 933
 934     while (list) {
 935         DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data,
 936                                              TYPE_DEVICE);
 937         GSList *next;
 938         if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) &&
 939             dc->user_creatable) {
 940             const char *name = object_class_get_name(list->data);
 941             /*
 942              * A network device might also be something else than a NIC, see
 943              * e.g. the "rocker" device. Thus we have to look for the "netdev"
 944              * property, too. Unfortunately, some devices like virtio-net only
 945              * create this property during instance_init, so we have to create
 946              * a temporary instance here to be able to check it.
 947              */
 948             Object *obj = object_new_with_class(OBJECT_CLASS(dc));
 949             if (object_property_find(obj, "netdev")) {
 950                 g_ptr_array_add(nic_models, (gpointer)name);
 951             }
 952             object_unref(obj);
 953         }
 954         next = list->next;
 955         g_slist_free_1(list);
 956         list = next;
 957     }
 958     g_ptr_array_add(nic_models, NULL);
 959
 960     return nic_models;
 961 }
 962
 963 int qemu_show_nic_models(const char *arg, const char *const *models)
 964 {
 965     int i;
 966
 967     if (!arg || !is_help_option(arg)) {
 968         return 0;
 969     }
 970
 971     printf("Available NIC models:\n");
 972     for (i = 0 ; models[i]; i++) {
 973         printf("%s\n", models[i]);
 974     }
 975     return 1;
 976 }
 977
 978 void qemu_check_nic_model(NICInfo *nd, const char *model)
 979 {
 980     const char *models[2];
 981
 982     models[0] = model;
 983     models[1] = NULL;
 984
 985     if (qemu_show_nic_models(nd->model, models))
 986         exit(0);
 987     if (qemu_find_nic_model(nd, models, model) < 0)
 988         exit(1);
 989 }
 990
 991 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 992                         const char *default_model)
 993 {
 994     int i;
 995
 996     if (!nd->model)
 997         nd->model = g_strdup(default_model);
 998
 999     for (i = 0 ; models[i]; i++) {
1000         if (strcmp(nd->model, models[i]) == 0)
1001             return i;
1002     }
1003
1004     error_report("Unsupported NIC model: %s", nd->model);
1005     return -1;
1006 }
1007
1008 static int net_init_nic(const Netdev *netdev, const char *name,
1009                         NetClientState *peer, Error **errp)
1010 {
1011     int idx;
1012     NICInfo *nd;
1013     const NetLegacyNicOptions *nic;
1014
1015     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
1016     nic = &netdev->u.nic;
1017
1018     idx = nic_get_free_idx();
1019     if (idx == -1 || nb_nics >= MAX_NICS) {
1020         error_setg(errp, "too many NICs");
1021         return -1;
1022     }
1023
1024     nd = &nd_table[idx];
1025
1026     memset(nd, 0, sizeof(*nd));
1027
1028     if (nic->netdev) {
1029         nd->netdev = qemu_find_netdev(nic->netdev);
1030         if (!nd->netdev) {
1031             error_setg(errp, "netdev '%s' not found", nic->netdev);
1032             return -1;
1033         }
1034     } else {
1035         assert(peer);
1036         nd->netdev = peer;
1037     }
1038     nd->name = g_strdup(name);
1039     if (nic->model) {
1040         nd->model = g_strdup(nic->model);
1041     }
1042     if (nic->addr) {
1043         nd->devaddr = g_strdup(nic->addr);
1044     }
1045
1046     if (nic->macaddr &&
1047         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
1048         error_setg(errp, "invalid syntax for ethernet address");
1049         return -1;
1050     }
1051     if (nic->macaddr &&
1052         is_multicast_ether_addr(nd->macaddr.a)) {
1053         error_setg(errp,
1054                    "NIC cannot have multicast MAC address (odd 1st byte)");
1055         return -1;
1056     }
1057     qemu_macaddr_default_if_unset(&nd->macaddr);
1058
1059     if (nic->has_vectors) {
1060         if (nic->vectors > 0x7ffffff) {
1061             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
1062             return -1;
1063         }
1064         nd->nvectors = nic->vectors;
1065     } else {
1066         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
1067     }
1068
1069     nd->used = 1;
1070     nb_nics++;
1071
1072     return idx;
1073 }
1074
1075
1076 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
1077     const Netdev *netdev,
1078     const char *name,
1079     NetClientState *peer, Error **errp) = {
1080         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
1081 #ifdef CONFIG_SLIRP
1082         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
1083 #endif
1084         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
1085         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
1086         [NET_CLIENT_DRIVER_STREAM]    = net_init_stream,
1087         [NET_CLIENT_DRIVER_DGRAM]     = net_init_dgram,
1088 #ifdef CONFIG_VDE
1089         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
1090 #endif
1091 #ifdef CONFIG_NETMAP
1092         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
1093 #endif
1094 #ifdef CONFIG_NET_BRIDGE
1095         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
1096 #endif
1097         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
1098 #ifdef CONFIG_VHOST_NET_USER
1099         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
1100 #endif
1101 #ifdef CONFIG_VHOST_NET_VDPA
1102         [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
1103 #endif
1104 #ifdef CONFIG_L2TPV3
1105         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
1106 #endif
1107 #ifdef CONFIG_VMNET
1108         [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host,
1109         [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared,
1110         [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged,
1111 #endif /* CONFIG_VMNET */
1112 };
1113
1114
1115 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
1116 {
1117     NetClientState *peer = NULL;
1118     NetClientState *nc;
1119
1120     if (is_netdev) {
1121         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
1122             !net_client_init_fun[netdev->type]) {
1123             error_setg(errp, "network backend '%s' is not compiled into this binary",
1124                        NetClientDriver_str(netdev->type));
1125             return -1;
1126         }
1127     } else {
1128         if (netdev->type == NET_CLIENT_DRIVER_NONE) {
1129             return 0; /* nothing to do */
1130         }
1131         if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) {
1132             error_setg(errp, "network backend '%s' is only supported with -netdev/-nic",
1133                        NetClientDriver_str(netdev->type));
1134             return -1;
1135         }
1136
1137         if (!net_client_init_fun[netdev->type]) {
1138             error_setg(errp, "network backend '%s' is not compiled into this binary",
1139                        NetClientDriver_str(netdev->type));
1140             return -1;
1141         }
1142
1143         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1144         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1145             !netdev->u.nic.netdev) {
1146             peer = net_hub_add_port(0, NULL, NULL);
1147         }
1148     }
1149
1150     nc = qemu_find_netdev(netdev->id);
1151     if (nc) {
1152         error_setg(errp, "Duplicate ID '%s'", netdev->id);
1153         return -1;
1154     }
1155
1156     if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1157         /* FIXME drop when all init functions store an Error */
1158         if (errp && !*errp) {
1159             error_setg(errp, "Device '%s' could not be initialized",
1160                        NetClientDriver_str(netdev->type));
1161         }
1162         return -1;
1163     }
1164
1165     if (is_netdev) {
1166         nc = qemu_find_netdev(netdev->id);
1167         assert(nc);
1168         nc->is_netdev = true;
1169     }
1170
1171     return 0;
1172 }
1173
1174 void show_netdevs(void)
1175 {
1176     int idx;
1177     const char *available_netdevs[] = {
1178         "socket",
1179         "stream",
1180         "dgram",
1181         "hubport",
1182         "tap",
1183 #ifdef CONFIG_SLIRP
1184         "user",
1185 #endif
1186 #ifdef CONFIG_L2TPV3
1187         "l2tpv3",
1188 #endif
1189 #ifdef CONFIG_VDE
1190         "vde",
1191 #endif
1192 #ifdef CONFIG_NET_BRIDGE
1193         "bridge",
1194 #endif
1195 #ifdef CONFIG_NETMAP
1196         "netmap",
1197 #endif
1198 #ifdef CONFIG_POSIX
1199         "vhost-user",
1200 #endif
1201 #ifdef CONFIG_VHOST_VDPA
1202         "vhost-vdpa",
1203 #endif
1204 #ifdef CONFIG_VMNET
1205         "vmnet-host",
1206         "vmnet-shared",
1207         "vmnet-bridged",
1208 #endif
1209     };
1210
1211     qemu_printf("Available netdev backend types:\n");
1212     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1213         qemu_printf("%s\n", available_netdevs[idx]);
1214     }
1215 }
1216
1217 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1218 {
1219     gchar **substrings = NULL;
1220     Netdev *object = NULL;
1221     int ret = -1;
1222     Visitor *v = opts_visitor_new(opts);
1223
1224     /* Parse convenience option format ip6-net=fec0::0[/64] */
1225     const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1226
1227     if (ip6_net) {
1228         char *prefix_addr;
1229         unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1230
1231         substrings = g_strsplit(ip6_net, "/", 2);
1232         if (!substrings || !substrings[0]) {
1233             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1234                        "a valid IPv6 prefix");
1235             goto out;
1236         }
1237
1238         prefix_addr = substrings[0];
1239
1240         /* Handle user-specified prefix length. */
1241         if (substrings[1] &&
1242             qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1243         {
1244             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1245                        "ipv6-prefixlen", "a number");
1246             goto out;
1247         }
1248
1249         qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1250         qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1251                             &error_abort);
1252         qemu_opt_unset(opts, "ipv6-net");
1253     }
1254
1255     /* Create an ID for -net if the user did not specify one */
1256     if (!is_netdev && !qemu_opts_id(opts)) {
1257         qemu_opts_set_id(opts, id_generate(ID_NET));
1258     }
1259
1260     if (visit_type_Netdev(v, NULL, &object, errp)) {
1261         ret = net_client_init1(object, is_netdev, errp);
1262     }
1263
1264     qapi_free_Netdev(object);
1265
1266 out:
1267     g_strfreev(substrings);
1268     visit_free(v);
1269     return ret;
1270 }
1271
1272 void netdev_add(QemuOpts *opts, Error **errp)
1273 {
1274     net_client_init(opts, true, errp);
1275 }
1276
1277 void qmp_netdev_add(Netdev *netdev, Error **errp)
1278 {
1279     if (!id_wellformed(netdev->id)) {
1280         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
1281         return;
1282     }
1283
1284     net_client_init1(netdev, true, errp);
1285 }
1286
1287 void qmp_netdev_del(const char *id, Error **errp)
1288 {
1289     NetClientState *nc;
1290     QemuOpts *opts;
1291
1292     nc = qemu_find_netdev(id);
1293     if (!nc) {
1294         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1295                   "Device '%s' not found", id);
1296         return;
1297     }
1298
1299     if (!nc->is_netdev) {
1300         error_setg(errp, "Device '%s' is not a netdev", id);
1301         return;
1302     }
1303
1304     qemu_del_net_client(nc);
1305
1306     /*
1307      * Wart: we need to delete the QemuOpts associated with netdevs
1308      * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in
1309      * HMP netdev_add.
1310      */
1311     opts = qemu_opts_find(qemu_find_opts("netdev"), id);
1312     if (opts) {
1313         qemu_opts_del(opts);
1314     }
1315 }
1316
1317 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1318 {
1319     char *str;
1320     ObjectProperty *prop;
1321     ObjectPropertyIterator iter;
1322     Visitor *v;
1323
1324     /* generate info str */
1325     object_property_iter_init(&iter, OBJECT(nf));
1326     while ((prop = object_property_iter_next(&iter))) {
1327         if (!strcmp(prop->name, "type")) {
1328             continue;
1329         }
1330         v = string_output_visitor_new(false, &str);
1331         object_property_get(OBJECT(nf), prop->name, v, NULL);
1332         visit_complete(v, &str);
1333         visit_free(v);
1334         monitor_printf(mon, ",%s=%s", prop->name, str);
1335         g_free(str);
1336     }
1337     monitor_printf(mon, "\n");
1338 }
1339
1340 void print_net_client(Monitor *mon, NetClientState *nc)
1341 {
1342     NetFilterState *nf;
1343
1344     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1345                    nc->queue_index,
1346                    NetClientDriver_str(nc->info->type),
1347                    nc->info_str);
1348     if (!QTAILQ_EMPTY(&nc->filters)) {
1349         monitor_printf(mon, "filters:\n");
1350     }
1351     QTAILQ_FOREACH(nf, &nc->filters, next) {
1352         monitor_printf(mon, "  - %s: type=%s",
1353                        object_get_canonical_path_component(OBJECT(nf)),
1354                        object_get_typename(OBJECT(nf)));
1355         netfilter_print_info(mon, nf);
1356     }
1357 }
1358
1359 RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp)
1360 {
1361     NetClientState *nc;
1362     RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
1363
1364     QTAILQ_FOREACH(nc, &net_clients, next) {
1365         RxFilterInfo *info;
1366
1367         if (name && strcmp(nc->name, name) != 0) {
1368             continue;
1369         }
1370
1371         /* only query rx-filter information of NIC */
1372         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1373             if (name) {
1374                 error_setg(errp, "net client(%s) isn't a NIC", name);
1375                 assert(!filter_list);
1376                 return NULL;
1377             }
1378             continue;
1379         }
1380
1381         /* only query information on queue 0 since the info is per nic,
1382          * not per queue
1383          */
1384         if (nc->queue_index != 0)
1385             continue;
1386
1387         if (nc->info->query_rx_filter) {
1388             info = nc->info->query_rx_filter(nc);
1389             QAPI_LIST_APPEND(tail, info);
1390         } else if (name) {
1391             error_setg(errp, "net client(%s) doesn't support"
1392                        " rx-filter querying", name);
1393             assert(!filter_list);
1394             return NULL;
1395         }
1396
1397         if (name) {
1398             break;
1399         }
1400     }
1401
1402     if (filter_list == NULL && name) {
1403         error_setg(errp, "invalid net client name: %s", name);
1404     }
1405
1406     return filter_list;
1407 }
1408
1409 void colo_notify_filters_event(int event, Error **errp)
1410 {
1411     NetClientState *nc;
1412     NetFilterState *nf;
1413     NetFilterClass *nfc = NULL;
1414     Error *local_err = NULL;
1415
1416     QTAILQ_FOREACH(nc, &net_clients, next) {
1417         QTAILQ_FOREACH(nf, &nc->filters, next) {
1418             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1419             nfc->handle_event(nf, event, &local_err);
1420             if (local_err) {
1421                 error_propagate(errp, local_err);
1422                 return;
1423             }
1424         }
1425     }
1426 }
1427
1428 void qmp_set_link(const char *name, bool up, Error **errp)
1429 {
1430     NetClientState *ncs[MAX_QUEUE_NUM];
1431     NetClientState *nc;
1432     int queues, i;
1433
1434     queues = qemu_find_net_clients_except(name, ncs,
1435                                           NET_CLIENT_DRIVER__MAX,
1436                                           MAX_QUEUE_NUM);
1437
1438     if (queues == 0) {
1439         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1440                   "Device '%s' not found", name);
1441         return;
1442     }
1443     nc = ncs[0];
1444
1445     for (i = 0; i < queues; i++) {
1446         ncs[i]->link_down = !up;
1447     }
1448
1449     if (nc->info->link_status_changed) {
1450         nc->info->link_status_changed(nc);
1451     }
1452
1453     if (nc->peer) {
1454         /* Change peer link only if the peer is NIC and then notify peer.
1455          * If the peer is a HUBPORT or a backend, we do not change the
1456          * link status.
1457          *
1458          * This behavior is compatible with qemu hubs where there could be
1459          * multiple clients that can still communicate with each other in
1460          * disconnected mode. For now maintain this compatibility.
1461          */
1462         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1463             for (i = 0; i < queues; i++) {
1464                 ncs[i]->peer->link_down = !up;
1465             }
1466         }
1467         if (nc->peer->info->link_status_changed) {
1468             nc->peer->info->link_status_changed(nc->peer);
1469         }
1470     }
1471 }
1472
1473 static void net_vm_change_state_handler(void *opaque, bool running,
1474                                         RunState state)
1475 {
1476     NetClientState *nc;
1477     NetClientState *tmp;
1478
1479     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1480         if (running) {
1481             /* Flush queued packets and wake up backends. */
1482             if (nc->peer && qemu_can_send_packet(nc)) {
1483                 qemu_flush_queued_packets(nc->peer);
1484             }
1485         } else {
1486             /* Complete all queued packets, to guarantee we don't modify
1487              * state later when VM is not running.
1488              */
1489             qemu_flush_or_purge_queued_packets(nc, true);
1490         }
1491     }
1492 }
1493
1494 void net_cleanup(void)
1495 {
1496     NetClientState *nc;
1497
1498     /*cleanup colo compare module for COLO*/
1499     colo_compare_cleanup();
1500
1501     /* We may del multiple entries during qemu_del_net_client(),
1502      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1503      */
1504     while (!QTAILQ_EMPTY(&net_clients)) {
1505         nc = QTAILQ_FIRST(&net_clients);
1506         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1507             qemu_del_nic(qemu_get_nic(nc));
1508         } else {
1509             qemu_del_net_client(nc);
1510         }
1511     }
1512
1513     qemu_del_vm_change_state_handler(net_change_state_entry);
1514 }
1515
1516 void net_check_clients(void)
1517 {
1518     NetClientState *nc;
1519     int i;
1520
1521     net_hub_check_clients();
1522
1523     QTAILQ_FOREACH(nc, &net_clients, next) {
1524         if (!nc->peer) {
1525             warn_report("%s %s has no peer",
1526                         nc->info->type == NET_CLIENT_DRIVER_NIC
1527                         ? "nic" : "netdev",
1528                         nc->name);
1529         }
1530     }
1531
1532     /* Check that all NICs requested via -net nic actually got created.
1533      * NICs created via -device don't need to be checked here because
1534      * they are always instantiated.
1535      */
1536     for (i = 0; i < MAX_NICS; i++) {
1537         NICInfo *nd = &nd_table[i];
1538         if (nd->used && !nd->instantiated) {
1539             warn_report("requested NIC (%s, model %s) "
1540                         "was not created (not supported by this machine?)",
1541                         nd->name ? nd->name : "anonymous",
1542                         nd->model ? nd->model : "unspecified");
1543         }
1544     }
1545 }
1546
1547 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1548 {
1549     return net_client_init(opts, false, errp);
1550 }
1551
1552 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1553 {
1554     const char *type = qemu_opt_get(opts, "type");
1555
1556     if (type && is_help_option(type)) {
1557         show_netdevs();
1558         exit(0);
1559     }
1560     return net_client_init(opts, true, errp);
1561 }
1562
1563 /* For the convenience "--nic" parameter */
1564 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1565 {
1566     char *mac, *nd_id;
1567     int idx, ret;
1568     NICInfo *ni;
1569     const char *type;
1570
1571     type = qemu_opt_get(opts, "type");
1572     if (type) {
1573         if (g_str_equal(type, "none")) {
1574             return 0;    /* Nothing to do, default_net is cleared in vl.c */
1575         }
1576         if (is_help_option(type)) {
1577             GPtrArray *nic_models = qemu_get_nic_models(TYPE_DEVICE);
1578             show_netdevs();
1579             printf("\n");
1580             qemu_show_nic_models(type, (const char **)nic_models->pdata);
1581             g_ptr_array_free(nic_models, true);
1582             exit(0);
1583         }
1584     }
1585
1586     idx = nic_get_free_idx();
1587     if (idx == -1 || nb_nics >= MAX_NICS) {
1588         error_setg(errp, "no more on-board/default NIC slots available");
1589         return -1;
1590     }
1591
1592     if (!type) {
1593         qemu_opt_set(opts, "type", "user", &error_abort);
1594     }
1595
1596     ni = &nd_table[idx];
1597     memset(ni, 0, sizeof(*ni));
1598     ni->model = qemu_opt_get_del(opts, "model");
1599
1600     /* Create an ID if the user did not specify one */
1601     nd_id = g_strdup(qemu_opts_id(opts));
1602     if (!nd_id) {
1603         nd_id = id_generate(ID_NET);
1604         qemu_opts_set_id(opts, nd_id);
1605     }
1606
1607     /* Handle MAC address */
1608     mac = qemu_opt_get_del(opts, "mac");
1609     if (mac) {
1610         ret = net_parse_macaddr(ni->macaddr.a, mac);
1611         g_free(mac);
1612         if (ret) {
1613             error_setg(errp, "invalid syntax for ethernet address");
1614             goto out;
1615         }
1616         if (is_multicast_ether_addr(ni->macaddr.a)) {
1617             error_setg(errp, "NIC cannot have multicast MAC address");
1618             ret = -1;
1619             goto out;
1620         }
1621     }
1622     qemu_macaddr_default_if_unset(&ni->macaddr);
1623
1624     ret = net_client_init(opts, true, errp);
1625     if (ret == 0) {
1626         ni->netdev = qemu_find_netdev(nd_id);
1627         ni->used = true;
1628         nb_nics++;
1629     }
1630
1631 out:
1632     g_free(nd_id);
1633     return ret;
1634 }
1635
1636 static void netdev_init_modern(void)
1637 {
1638     while (!QSIMPLEQ_EMPTY(&nd_queue)) {
1639         NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue);
1640
1641         QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry);
1642         loc_push_restore(&nd->loc);
1643         net_client_init1(nd->nd, true, &error_fatal);
1644         loc_pop(&nd->loc);
1645         qapi_free_Netdev(nd->nd);
1646         g_free(nd);
1647     }
1648 }
1649
1650 void net_init_clients(void)
1651 {
1652     net_change_state_entry =
1653         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1654
1655     QTAILQ_INIT(&net_clients);
1656
1657     netdev_init_modern();
1658
1659     qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL,
1660                       &error_fatal);
1661
1662     qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL,
1663                       &error_fatal);
1664
1665     qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL,
1666                       &error_fatal);
1667 }
1668
1669 /*
1670  * Does this -netdev argument use modern rather than traditional syntax?
1671  * Modern syntax is to be parsed with netdev_parse_modern().
1672  * Traditional syntax is to be parsed with net_client_parse().
1673  */
1674 bool netdev_is_modern(const char *optarg)
1675 {
1676     QemuOpts *opts;
1677     bool is_modern;
1678     const char *type;
1679     static QemuOptsList dummy_opts = {
1680         .name = "netdev",
1681         .implied_opt_name = "type",
1682         .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head),
1683         .desc = { { } },
1684     };
1685
1686     if (optarg[0] == '{') {
1687         /* This is JSON, which means it's modern syntax */
1688         return true;
1689     }
1690
1691     opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort);
1692     qemu_opts_do_parse(opts, optarg, dummy_opts.implied_opt_name,
1693                        &error_abort);
1694     type = qemu_opt_get(opts, "type");
1695     is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram");
1696
1697     qemu_opts_reset(&dummy_opts);
1698
1699     return is_modern;
1700 }
1701
1702 /*
1703  * netdev_parse_modern() uses modern, more expressive syntax than
1704  * net_client_parse(), but supports only the -netdev option.
1705  * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse()
1706  * appends to @qemu_netdev_opts.
1707  */
1708 void netdev_parse_modern(const char *optarg)
1709 {
1710     Visitor *v;
1711     NetdevQueueEntry *nd;
1712
1713     v = qobject_input_visitor_new_str(optarg, "type", &error_fatal);
1714     nd = g_new(NetdevQueueEntry, 1);
1715     visit_type_Netdev(v, NULL, &nd->nd, &error_fatal);
1716     visit_free(v);
1717     loc_save(&nd->loc);
1718
1719     QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry);
1720 }
1721
1722 void net_client_parse(QemuOptsList *opts_list, const char *optarg)
1723 {
1724     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1725         exit(1);
1726     }
1727 }
1728
1729 /* From FreeBSD */
1730 /* XXX: optimize */
1731 uint32_t net_crc32(const uint8_t *p, int len)
1732 {
1733     uint32_t crc;
1734     int carry, i, j;
1735     uint8_t b;
1736
1737     crc = 0xffffffff;
1738     for (i = 0; i < len; i++) {
1739         b = *p++;
1740         for (j = 0; j < 8; j++) {
1741             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1742             crc <<= 1;
1743             b >>= 1;
1744             if (carry) {
1745                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1746             }
1747         }
1748     }
1749
1750     return crc;
1751 }
1752
1753 uint32_t net_crc32_le(const uint8_t *p, int len)
1754 {
1755     uint32_t crc;
1756     int carry, i, j;
1757     uint8_t b;
1758
1759     crc = 0xffffffff;
1760     for (i = 0; i < len; i++) {
1761         b = *p++;
1762         for (j = 0; j < 8; j++) {
1763             carry = (crc & 0x1) ^ (b & 0x01);
1764             crc >>= 1;
1765             b >>= 1;
1766             if (carry) {
1767                 crc ^= POLYNOMIAL_LE;
1768             }
1769         }
1770     }
1771
1772     return crc;
1773 }
1774
1775 QemuOptsList qemu_netdev_opts = {
1776     .name = "netdev",
1777     .implied_opt_name = "type",
1778     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1779     .desc = {
1780         /*
1781          * no elements => accept any params
1782          * validation will happen later
1783          */
1784         { /* end of list */ }
1785     },
1786 };
1787
1788 QemuOptsList qemu_nic_opts = {
1789     .name = "nic",
1790     .implied_opt_name = "type",
1791     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1792     .desc = {
1793         /*
1794          * no elements => accept any params
1795          * validation will happen later
1796          */
1797         { /* end of list */ }
1798     },
1799 };
1800
1801 QemuOptsList qemu_net_opts = {
1802     .name = "net",
1803     .implied_opt_name = "type",
1804     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1805     .desc = {
1806         /*
1807          * no elements => accept any params
1808          * validation will happen later
1809          */
1810         { /* end of list */ }
1811     },
1812 };
1813
1814 void net_socket_rs_init(SocketReadState *rs,
1815                         SocketReadStateFinalize *finalize,
1816                         bool vnet_hdr)
1817 {
1818     rs->state = 0;
1819     rs->vnet_hdr = vnet_hdr;
1820     rs->index = 0;
1821     rs->packet_len = 0;
1822     rs->vnet_hdr_len = 0;
1823     memset(rs->buf, 0, sizeof(rs->buf));
1824     rs->finalize = finalize;
1825 }
1826
1827 /*
1828  * Returns
1829  * 0: success
1830  * -1: error occurs
1831  */
1832 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1833 {
1834     unsigned int l;
1835
1836     while (size > 0) {
1837         /* Reassemble a packet from the network.
1838          * 0 = getting length.
1839          * 1 = getting vnet header length.
1840          * 2 = getting data.
1841          */
1842         switch (rs->state) {
1843         case 0:
1844             l = 4 - rs->index;
1845             if (l > size) {
1846                 l = size;
1847             }
1848             memcpy(rs->buf + rs->index, buf, l);
1849             buf += l;
1850             size -= l;
1851             rs->index += l;
1852             if (rs->index == 4) {
1853                 /* got length */
1854                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1855                 rs->index = 0;
1856                 if (rs->vnet_hdr) {
1857                     rs->state = 1;
1858                 } else {
1859                     rs->state = 2;
1860                     rs->vnet_hdr_len = 0;
1861                 }
1862             }
1863             break;
1864         case 1:
1865             l = 4 - rs->index;
1866             if (l > size) {
1867                 l = size;
1868             }
1869             memcpy(rs->buf + rs->index, buf, l);
1870             buf += l;
1871             size -= l;
1872             rs->index += l;
1873             if (rs->index == 4) {
1874                 /* got vnet header length */
1875                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1876                 rs->index = 0;
1877                 rs->state = 2;
1878             }
1879             break;
1880         case 2:
1881             l = rs->packet_len - rs->index;
1882             if (l > size) {
1883                 l = size;
1884             }
1885             if (rs->index + l <= sizeof(rs->buf)) {
1886                 memcpy(rs->buf + rs->index, buf, l);
1887             } else {
1888                 fprintf(stderr, "serious error: oversized packet received,"
1889                     "connection terminated.\n");
1890                 rs->index = rs->state = 0;
1891                 return -1;
1892             }
1893
1894             rs->index += l;
1895             buf += l;
1896             size -= l;
1897             if (rs->index >= rs->packet_len) {
1898                 rs->index = 0;
1899                 rs->state = 0;
1900                 assert(rs->finalize);
1901                 rs->finalize(rs);
1902             }
1903             break;
1904         }
1905     }
1906
1907     assert(size == 0);
1908     return 0;
1909 }