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 "qapi/error.h"
  52 #include "qapi/opts-visitor.h"
  53 #include "sysemu/runstate.h"
  54 #include "net/colo-compare.h"
  55 #include "net/filter.h"
  56 #include "qapi/string-output-visitor.h"
  57
  58 /* Net bridge is currently not supported for W32. */
  59 #if !defined(_WIN32)
  60 # define CONFIG_NET_BRIDGE
  61 #endif
  62
  63 static VMChangeStateEntry *net_change_state_entry;
  64 static QTAILQ_HEAD(, NetClientState) net_clients;
  65
  66 /***********************************************************/
  67 /* network device redirectors */
  68
  69 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  70                     Error **errp)
  71 {
  72     gchar **substrings;
  73     struct hostent *he;
  74     const char *addr, *p, *r;
  75     int port, ret = 0;
  76
  77     memset(saddr, 0, sizeof(*saddr));
  78
  79     substrings = g_strsplit(str, ":", 2);
  80     if (!substrings || !substrings[0] || !substrings[1]) {
  81         error_setg(errp, "host address '%s' doesn't contain ':' "
  82                    "separating host from port", str);
  83         ret = -1;
  84         goto out;
  85     }
  86
  87     addr = substrings[0];
  88     p = substrings[1];
  89
  90     saddr->sin_family = AF_INET;
  91     if (addr[0] == '\0') {
  92         saddr->sin_addr.s_addr = 0;
  93     } else {
  94         if (qemu_isdigit(addr[0])) {
  95             if (!inet_aton(addr, &saddr->sin_addr)) {
  96                 error_setg(errp, "host address '%s' is not a valid "
  97                            "IPv4 address", addr);
  98                 ret = -1;
  99                 goto out;
 100             }
 101         } else {
 102             he = gethostbyname(addr);
 103             if (he == NULL) {
 104                 error_setg(errp, "can't resolve host address '%s'", addr);
 105                 ret = -1;
 106                 goto out;
 107             }
 108             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 109         }
 110     }
 111     port = strtol(p, (char **)&r, 0);
 112     if (r == p) {
 113         error_setg(errp, "port number '%s' is invalid", p);
 114         ret = -1;
 115         goto out;
 116     }
 117     saddr->sin_port = htons(port);
 118
 119 out:
 120     g_strfreev(substrings);
 121     return ret;
 122 }
 123
 124 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 125 {
 126     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 127                            macaddr[0], macaddr[1], macaddr[2],
 128                            macaddr[3], macaddr[4], macaddr[5]);
 129 }
 130
 131 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 132 {
 133     snprintf(nc->info_str, sizeof(nc->info_str),
 134              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 135              nc->model,
 136              macaddr[0], macaddr[1], macaddr[2],
 137              macaddr[3], macaddr[4], macaddr[5]);
 138 }
 139
 140 static int mac_table[256] = {0};
 141
 142 static void qemu_macaddr_set_used(MACAddr *macaddr)
 143 {
 144     int index;
 145
 146     for (index = 0x56; index < 0xFF; index++) {
 147         if (macaddr->a[5] == index) {
 148             mac_table[index]++;
 149         }
 150     }
 151 }
 152
 153 static void qemu_macaddr_set_free(MACAddr *macaddr)
 154 {
 155     int index;
 156     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 157
 158     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 159         return;
 160     }
 161     for (index = 0x56; index < 0xFF; index++) {
 162         if (macaddr->a[5] == index) {
 163             mac_table[index]--;
 164         }
 165     }
 166 }
 167
 168 static int qemu_macaddr_get_free(void)
 169 {
 170     int index;
 171
 172     for (index = 0x56; index < 0xFF; index++) {
 173         if (mac_table[index] == 0) {
 174             return index;
 175         }
 176     }
 177
 178     return -1;
 179 }
 180
 181 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 182 {
 183     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 184     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 185
 186     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 187         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 188             return;
 189         } else {
 190             qemu_macaddr_set_used(macaddr);
 191             return;
 192         }
 193     }
 194
 195     macaddr->a[0] = 0x52;
 196     macaddr->a[1] = 0x54;
 197     macaddr->a[2] = 0x00;
 198     macaddr->a[3] = 0x12;
 199     macaddr->a[4] = 0x34;
 200     macaddr->a[5] = qemu_macaddr_get_free();
 201     qemu_macaddr_set_used(macaddr);
 202 }
 203
 204 /**
 205  * Generate a name for net client
 206  *
 207  * Only net clients created with the legacy -net option and NICs need this.
 208  */
 209 static char *assign_name(NetClientState *nc1, const char *model)
 210 {
 211     NetClientState *nc;
 212     int id = 0;
 213
 214     QTAILQ_FOREACH(nc, &net_clients, next) {
 215         if (nc == nc1) {
 216             continue;
 217         }
 218         if (strcmp(nc->model, model) == 0) {
 219             id++;
 220         }
 221     }
 222
 223     return g_strdup_printf("%s.%d", model, id);
 224 }
 225
 226 static void qemu_net_client_destructor(NetClientState *nc)
 227 {
 228     g_free(nc);
 229 }
 230 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 231                                        unsigned flags,
 232                                        const struct iovec *iov,
 233                                        int iovcnt,
 234                                        void *opaque);
 235
 236 static void qemu_net_client_setup(NetClientState *nc,
 237                                   NetClientInfo *info,
 238                                   NetClientState *peer,
 239                                   const char *model,
 240                                   const char *name,
 241                                   NetClientDestructor *destructor,
 242                                   bool is_datapath)
 243 {
 244     nc->info = info;
 245     nc->model = g_strdup(model);
 246     if (name) {
 247         nc->name = g_strdup(name);
 248     } else {
 249         nc->name = assign_name(nc, model);
 250     }
 251
 252     if (peer) {
 253         assert(!peer->peer);
 254         nc->peer = peer;
 255         peer->peer = nc;
 256     }
 257     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 258
 259     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 260     nc->destructor = destructor;
 261     nc->is_datapath = is_datapath;
 262     QTAILQ_INIT(&nc->filters);
 263 }
 264
 265 NetClientState *qemu_new_net_client(NetClientInfo *info,
 266                                     NetClientState *peer,
 267                                     const char *model,
 268                                     const char *name)
 269 {
 270     NetClientState *nc;
 271
 272     assert(info->size >= sizeof(NetClientState));
 273
 274     nc = g_malloc0(info->size);
 275     qemu_net_client_setup(nc, info, peer, model, name,
 276                           qemu_net_client_destructor, true);
 277
 278     return nc;
 279 }
 280
 281 NetClientState *qemu_new_net_control_client(NetClientInfo *info,
 282                                             NetClientState *peer,
 283                                             const char *model,
 284                                             const char *name)
 285 {
 286     NetClientState *nc;
 287
 288     assert(info->size >= sizeof(NetClientState));
 289
 290     nc = g_malloc0(info->size);
 291     qemu_net_client_setup(nc, info, peer, model, name,
 292                           qemu_net_client_destructor, false);
 293
 294     return nc;
 295 }
 296
 297 NICState *qemu_new_nic(NetClientInfo *info,
 298                        NICConf *conf,
 299                        const char *model,
 300                        const char *name,
 301                        void *opaque)
 302 {
 303     NetClientState **peers = conf->peers.ncs;
 304     NICState *nic;
 305     int i, queues = MAX(1, conf->peers.queues);
 306
 307     assert(info->type == NET_CLIENT_DRIVER_NIC);
 308     assert(info->size >= sizeof(NICState));
 309
 310     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 311     nic->ncs = (void *)nic + info->size;
 312     nic->conf = conf;
 313     nic->opaque = opaque;
 314
 315     for (i = 0; i < queues; i++) {
 316         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 317                               NULL, true);
 318         nic->ncs[i].queue_index = i;
 319     }
 320
 321     return nic;
 322 }
 323
 324 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 325 {
 326     return nic->ncs + queue_index;
 327 }
 328
 329 NetClientState *qemu_get_queue(NICState *nic)
 330 {
 331     return qemu_get_subqueue(nic, 0);
 332 }
 333
 334 NICState *qemu_get_nic(NetClientState *nc)
 335 {
 336     NetClientState *nc0 = nc - nc->queue_index;
 337
 338     return (NICState *)((void *)nc0 - nc->info->size);
 339 }
 340
 341 void *qemu_get_nic_opaque(NetClientState *nc)
 342 {
 343     NICState *nic = qemu_get_nic(nc);
 344
 345     return nic->opaque;
 346 }
 347
 348 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
 349 {
 350     assert(nc != NULL);
 351     NetClientState *ncs = nc + queue_index;
 352     return ncs->peer;
 353 }
 354
 355 static void qemu_cleanup_net_client(NetClientState *nc)
 356 {
 357     QTAILQ_REMOVE(&net_clients, nc, next);
 358
 359     if (nc->info->cleanup) {
 360         nc->info->cleanup(nc);
 361     }
 362 }
 363
 364 static void qemu_free_net_client(NetClientState *nc)
 365 {
 366     if (nc->incoming_queue) {
 367         qemu_del_net_queue(nc->incoming_queue);
 368     }
 369     if (nc->peer) {
 370         nc->peer->peer = NULL;
 371     }
 372     g_free(nc->name);
 373     g_free(nc->model);
 374     if (nc->destructor) {
 375         nc->destructor(nc);
 376     }
 377 }
 378
 379 void qemu_del_net_client(NetClientState *nc)
 380 {
 381     NetClientState *ncs[MAX_QUEUE_NUM];
 382     int queues, i;
 383     NetFilterState *nf, *next;
 384
 385     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 386
 387     /* If the NetClientState belongs to a multiqueue backend, we will change all
 388      * other NetClientStates also.
 389      */
 390     queues = qemu_find_net_clients_except(nc->name, ncs,
 391                                           NET_CLIENT_DRIVER_NIC,
 392                                           MAX_QUEUE_NUM);
 393     assert(queues != 0);
 394
 395     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 396         object_unparent(OBJECT(nf));
 397     }
 398
 399     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 400     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 401         NICState *nic = qemu_get_nic(nc->peer);
 402         if (nic->peer_deleted) {
 403             return;
 404         }
 405         nic->peer_deleted = true;
 406
 407         for (i = 0; i < queues; i++) {
 408             ncs[i]->peer->link_down = true;
 409         }
 410
 411         if (nc->peer->info->link_status_changed) {
 412             nc->peer->info->link_status_changed(nc->peer);
 413         }
 414
 415         for (i = 0; i < queues; i++) {
 416             qemu_cleanup_net_client(ncs[i]);
 417         }
 418
 419         return;
 420     }
 421
 422     for (i = 0; i < queues; i++) {
 423         qemu_cleanup_net_client(ncs[i]);
 424         qemu_free_net_client(ncs[i]);
 425     }
 426 }
 427
 428 void qemu_del_nic(NICState *nic)
 429 {
 430     int i, queues = MAX(nic->conf->peers.queues, 1);
 431
 432     qemu_macaddr_set_free(&nic->conf->macaddr);
 433
 434     for (i = 0; i < queues; i++) {
 435         NetClientState *nc = qemu_get_subqueue(nic, i);
 436         /* If this is a peer NIC and peer has already been deleted, free it now. */
 437         if (nic->peer_deleted) {
 438             qemu_free_net_client(nc->peer);
 439         } else if (nc->peer) {
 440             /* if there are RX packets pending, complete them */
 441             qemu_purge_queued_packets(nc->peer);
 442         }
 443     }
 444
 445     for (i = queues - 1; i >= 0; i--) {
 446         NetClientState *nc = qemu_get_subqueue(nic, i);
 447
 448         qemu_cleanup_net_client(nc);
 449         qemu_free_net_client(nc);
 450     }
 451
 452     g_free(nic);
 453 }
 454
 455 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 456 {
 457     NetClientState *nc;
 458
 459     QTAILQ_FOREACH(nc, &net_clients, next) {
 460         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 461             if (nc->queue_index == 0) {
 462                 func(qemu_get_nic(nc), opaque);
 463             }
 464         }
 465     }
 466 }
 467
 468 bool qemu_has_ufo(NetClientState *nc)
 469 {
 470     if (!nc || !nc->info->has_ufo) {
 471         return false;
 472     }
 473
 474     return nc->info->has_ufo(nc);
 475 }
 476
 477 bool qemu_has_vnet_hdr(NetClientState *nc)
 478 {
 479     if (!nc || !nc->info->has_vnet_hdr) {
 480         return false;
 481     }
 482
 483     return nc->info->has_vnet_hdr(nc);
 484 }
 485
 486 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 487 {
 488     if (!nc || !nc->info->has_vnet_hdr_len) {
 489         return false;
 490     }
 491
 492     return nc->info->has_vnet_hdr_len(nc, len);
 493 }
 494
 495 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 496 {
 497     if (!nc || !nc->info->using_vnet_hdr) {
 498         return;
 499     }
 500
 501     nc->info->using_vnet_hdr(nc, enable);
 502 }
 503
 504 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 505                           int ecn, int ufo)
 506 {
 507     if (!nc || !nc->info->set_offload) {
 508         return;
 509     }
 510
 511     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 512 }
 513
 514 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 515 {
 516     if (!nc || !nc->info->set_vnet_hdr_len) {
 517         return;
 518     }
 519
 520     nc->vnet_hdr_len = len;
 521     nc->info->set_vnet_hdr_len(nc, len);
 522 }
 523
 524 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 525 {
 526 #if HOST_BIG_ENDIAN
 527     if (!nc || !nc->info->set_vnet_le) {
 528         return -ENOSYS;
 529     }
 530
 531     return nc->info->set_vnet_le(nc, is_le);
 532 #else
 533     return 0;
 534 #endif
 535 }
 536
 537 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 538 {
 539 #if HOST_BIG_ENDIAN
 540     return 0;
 541 #else
 542     if (!nc || !nc->info->set_vnet_be) {
 543         return -ENOSYS;
 544     }
 545
 546     return nc->info->set_vnet_be(nc, is_be);
 547 #endif
 548 }
 549
 550 int qemu_can_receive_packet(NetClientState *nc)
 551 {
 552     if (nc->receive_disabled) {
 553         return 0;
 554     } else if (nc->info->can_receive &&
 555                !nc->info->can_receive(nc)) {
 556         return 0;
 557     }
 558     return 1;
 559 }
 560
 561 int qemu_can_send_packet(NetClientState *sender)
 562 {
 563     int vm_running = runstate_is_running();
 564
 565     if (!vm_running) {
 566         return 0;
 567     }
 568
 569     if (!sender->peer) {
 570         return 1;
 571     }
 572
 573     return qemu_can_receive_packet(sender->peer);
 574 }
 575
 576 static ssize_t filter_receive_iov(NetClientState *nc,
 577                                   NetFilterDirection direction,
 578                                   NetClientState *sender,
 579                                   unsigned flags,
 580                                   const struct iovec *iov,
 581                                   int iovcnt,
 582                                   NetPacketSent *sent_cb)
 583 {
 584     ssize_t ret = 0;
 585     NetFilterState *nf = NULL;
 586
 587     if (direction == NET_FILTER_DIRECTION_TX) {
 588         QTAILQ_FOREACH(nf, &nc->filters, next) {
 589             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 590                                          iovcnt, sent_cb);
 591             if (ret) {
 592                 return ret;
 593             }
 594         }
 595     } else {
 596         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 597             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 598                                          iovcnt, sent_cb);
 599             if (ret) {
 600                 return ret;
 601             }
 602         }
 603     }
 604
 605     return ret;
 606 }
 607
 608 static ssize_t filter_receive(NetClientState *nc,
 609                               NetFilterDirection direction,
 610                               NetClientState *sender,
 611                               unsigned flags,
 612                               const uint8_t *data,
 613                               size_t size,
 614                               NetPacketSent *sent_cb)
 615 {
 616     struct iovec iov = {
 617         .iov_base = (void *)data,
 618         .iov_len = size
 619     };
 620
 621     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 622 }
 623
 624 void qemu_purge_queued_packets(NetClientState *nc)
 625 {
 626     if (!nc->peer) {
 627         return;
 628     }
 629
 630     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 631 }
 632
 633 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 634 {
 635     nc->receive_disabled = 0;
 636
 637     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 638         if (net_hub_flush(nc->peer)) {
 639             qemu_notify_event();
 640         }
 641     }
 642     if (qemu_net_queue_flush(nc->incoming_queue)) {
 643         /* We emptied the queue successfully, signal to the IO thread to repoll
 644          * the file descriptor (for tap, for example).
 645          */
 646         qemu_notify_event();
 647     } else if (purge) {
 648         /* Unable to empty the queue, purge remaining packets */
 649         qemu_net_queue_purge(nc->incoming_queue, nc->peer);
 650     }
 651 }
 652
 653 void qemu_flush_queued_packets(NetClientState *nc)
 654 {
 655     qemu_flush_or_purge_queued_packets(nc, false);
 656 }
 657
 658 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 659                                                  unsigned flags,
 660                                                  const uint8_t *buf, int size,
 661                                                  NetPacketSent *sent_cb)
 662 {
 663     NetQueue *queue;
 664     int ret;
 665
 666 #ifdef DEBUG_NET
 667     printf("qemu_send_packet_async:\n");
 668     qemu_hexdump(stdout, "net", buf, size);
 669 #endif
 670
 671     if (sender->link_down || !sender->peer) {
 672         return size;
 673     }
 674
 675     /* Let filters handle the packet first */
 676     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 677                          sender, flags, buf, size, sent_cb);
 678     if (ret) {
 679         return ret;
 680     }
 681
 682     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 683                          sender, flags, buf, size, sent_cb);
 684     if (ret) {
 685         return ret;
 686     }
 687
 688     queue = sender->peer->incoming_queue;
 689
 690     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 691 }
 692
 693 ssize_t qemu_send_packet_async(NetClientState *sender,
 694                                const uint8_t *buf, int size,
 695                                NetPacketSent *sent_cb)
 696 {
 697     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 698                                              buf, size, sent_cb);
 699 }
 700
 701 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 702 {
 703     return qemu_send_packet_async(nc, buf, size, NULL);
 704 }
 705
 706 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size)
 707 {
 708     if (!qemu_can_receive_packet(nc)) {
 709         return 0;
 710     }
 711
 712     return qemu_net_queue_receive(nc->incoming_queue, buf, size);
 713 }
 714
 715 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov,
 716                                 int iovcnt)
 717 {
 718     if (!qemu_can_receive_packet(nc)) {
 719         return 0;
 720     }
 721
 722     return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt);
 723 }
 724
 725 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 726 {
 727     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 728                                              buf, size, NULL);
 729 }
 730
 731 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 732                                int iovcnt, unsigned flags)
 733 {
 734     uint8_t *buf = NULL;
 735     uint8_t *buffer;
 736     size_t offset;
 737     ssize_t ret;
 738
 739     if (iovcnt == 1) {
 740         buffer = iov[0].iov_base;
 741         offset = iov[0].iov_len;
 742     } else {
 743         offset = iov_size(iov, iovcnt);
 744         if (offset > NET_BUFSIZE) {
 745             return -1;
 746         }
 747         buf = g_malloc(offset);
 748         buffer = buf;
 749         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 750     }
 751
 752     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 753         ret = nc->info->receive_raw(nc, buffer, offset);
 754     } else {
 755         ret = nc->info->receive(nc, buffer, offset);
 756     }
 757
 758     g_free(buf);
 759     return ret;
 760 }
 761
 762 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 763                                        unsigned flags,
 764                                        const struct iovec *iov,
 765                                        int iovcnt,
 766                                        void *opaque)
 767 {
 768     NetClientState *nc = opaque;
 769     int ret;
 770
 771
 772     if (nc->link_down) {
 773         return iov_size(iov, iovcnt);
 774     }
 775
 776     if (nc->receive_disabled) {
 777         return 0;
 778     }
 779
 780     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 781         ret = nc->info->receive_iov(nc, iov, iovcnt);
 782     } else {
 783         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 784     }
 785
 786     if (ret == 0) {
 787         nc->receive_disabled = 1;
 788     }
 789
 790     return ret;
 791 }
 792
 793 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 794                                 const struct iovec *iov, int iovcnt,
 795                                 NetPacketSent *sent_cb)
 796 {
 797     NetQueue *queue;
 798     size_t size = iov_size(iov, iovcnt);
 799     int ret;
 800
 801     if (size > NET_BUFSIZE) {
 802         return size;
 803     }
 804
 805     if (sender->link_down || !sender->peer) {
 806         return size;
 807     }
 808
 809     /* Let filters handle the packet first */
 810     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 811                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 812     if (ret) {
 813         return ret;
 814     }
 815
 816     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 817                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 818     if (ret) {
 819         return ret;
 820     }
 821
 822     queue = sender->peer->incoming_queue;
 823
 824     return qemu_net_queue_send_iov(queue, sender,
 825                                    QEMU_NET_PACKET_FLAG_NONE,
 826                                    iov, iovcnt, sent_cb);
 827 }
 828
 829 ssize_t
 830 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 831 {
 832     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 833 }
 834
 835 NetClientState *qemu_find_netdev(const char *id)
 836 {
 837     NetClientState *nc;
 838
 839     QTAILQ_FOREACH(nc, &net_clients, next) {
 840         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 841             continue;
 842         if (!strcmp(nc->name, id)) {
 843             return nc;
 844         }
 845     }
 846
 847     return NULL;
 848 }
 849
 850 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 851                                  NetClientDriver type, int max)
 852 {
 853     NetClientState *nc;
 854     int ret = 0;
 855
 856     QTAILQ_FOREACH(nc, &net_clients, next) {
 857         if (nc->info->type == type) {
 858             continue;
 859         }
 860         if (!id || !strcmp(nc->name, id)) {
 861             if (ret < max) {
 862                 ncs[ret] = nc;
 863             }
 864             ret++;
 865         }
 866     }
 867
 868     return ret;
 869 }
 870
 871 static int nic_get_free_idx(void)
 872 {
 873     int index;
 874
 875     for (index = 0; index < MAX_NICS; index++)
 876         if (!nd_table[index].used)
 877             return index;
 878     return -1;
 879 }
 880
 881 int qemu_show_nic_models(const char *arg, const char *const *models)
 882 {
 883     int i;
 884
 885     if (!arg || !is_help_option(arg)) {
 886         return 0;
 887     }
 888
 889     printf("Supported NIC models:\n");
 890     for (i = 0 ; models[i]; i++) {
 891         printf("%s\n", models[i]);
 892     }
 893     return 1;
 894 }
 895
 896 void qemu_check_nic_model(NICInfo *nd, const char *model)
 897 {
 898     const char *models[2];
 899
 900     models[0] = model;
 901     models[1] = NULL;
 902
 903     if (qemu_show_nic_models(nd->model, models))
 904         exit(0);
 905     if (qemu_find_nic_model(nd, models, model) < 0)
 906         exit(1);
 907 }
 908
 909 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 910                         const char *default_model)
 911 {
 912     int i;
 913
 914     if (!nd->model)
 915         nd->model = g_strdup(default_model);
 916
 917     for (i = 0 ; models[i]; i++) {
 918         if (strcmp(nd->model, models[i]) == 0)
 919             return i;
 920     }
 921
 922     error_report("Unsupported NIC model: %s", nd->model);
 923     return -1;
 924 }
 925
 926 static int net_init_nic(const Netdev *netdev, const char *name,
 927                         NetClientState *peer, Error **errp)
 928 {
 929     int idx;
 930     NICInfo *nd;
 931     const NetLegacyNicOptions *nic;
 932
 933     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 934     nic = &netdev->u.nic;
 935
 936     idx = nic_get_free_idx();
 937     if (idx == -1 || nb_nics >= MAX_NICS) {
 938         error_setg(errp, "too many NICs");
 939         return -1;
 940     }
 941
 942     nd = &nd_table[idx];
 943
 944     memset(nd, 0, sizeof(*nd));
 945
 946     if (nic->has_netdev) {
 947         nd->netdev = qemu_find_netdev(nic->netdev);
 948         if (!nd->netdev) {
 949             error_setg(errp, "netdev '%s' not found", nic->netdev);
 950             return -1;
 951         }
 952     } else {
 953         assert(peer);
 954         nd->netdev = peer;
 955     }
 956     nd->name = g_strdup(name);
 957     if (nic->has_model) {
 958         nd->model = g_strdup(nic->model);
 959     }
 960     if (nic->has_addr) {
 961         nd->devaddr = g_strdup(nic->addr);
 962     }
 963
 964     if (nic->has_macaddr &&
 965         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 966         error_setg(errp, "invalid syntax for ethernet address");
 967         return -1;
 968     }
 969     if (nic->has_macaddr &&
 970         is_multicast_ether_addr(nd->macaddr.a)) {
 971         error_setg(errp,
 972                    "NIC cannot have multicast MAC address (odd 1st byte)");
 973         return -1;
 974     }
 975     qemu_macaddr_default_if_unset(&nd->macaddr);
 976
 977     if (nic->has_vectors) {
 978         if (nic->vectors > 0x7ffffff) {
 979             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 980             return -1;
 981         }
 982         nd->nvectors = nic->vectors;
 983     } else {
 984         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 985     }
 986
 987     nd->used = 1;
 988     nb_nics++;
 989
 990     return idx;
 991 }
 992
 993
 994 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 995     const Netdev *netdev,
 996     const char *name,
 997     NetClientState *peer, Error **errp) = {
 998         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 999 #ifdef CONFIG_SLIRP
1000         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
1001 #endif
1002         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
1003         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
1004 #ifdef CONFIG_VDE
1005         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
1006 #endif
1007 #ifdef CONFIG_NETMAP
1008         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
1009 #endif
1010 #ifdef CONFIG_NET_BRIDGE
1011         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
1012 #endif
1013         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
1014 #ifdef CONFIG_VHOST_NET_USER
1015         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
1016 #endif
1017 #ifdef CONFIG_VHOST_NET_VDPA
1018         [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
1019 #endif
1020 #ifdef CONFIG_L2TPV3
1021         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
1022 #endif
1023 };
1024
1025
1026 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
1027 {
1028     NetClientState *peer = NULL;
1029     NetClientState *nc;
1030
1031     if (is_netdev) {
1032         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
1033             !net_client_init_fun[netdev->type]) {
1034             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1035                        "a netdev backend type");
1036             return -1;
1037         }
1038     } else {
1039         if (netdev->type == NET_CLIENT_DRIVER_NONE) {
1040             return 0; /* nothing to do */
1041         }
1042         if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
1043             !net_client_init_fun[netdev->type]) {
1044             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1045                        "a net backend type (maybe it is not compiled "
1046                        "into this binary)");
1047             return -1;
1048         }
1049
1050         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1051         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1052             !netdev->u.nic.has_netdev) {
1053             peer = net_hub_add_port(0, NULL, NULL);
1054         }
1055     }
1056
1057     nc = qemu_find_netdev(netdev->id);
1058     if (nc) {
1059         error_setg(errp, "Duplicate ID '%s'", netdev->id);
1060         return -1;
1061     }
1062
1063     if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1064         /* FIXME drop when all init functions store an Error */
1065         if (errp && !*errp) {
1066             error_setg(errp, "Device '%s' could not be initialized",
1067                        NetClientDriver_str(netdev->type));
1068         }
1069         return -1;
1070     }
1071
1072     if (is_netdev) {
1073         nc = qemu_find_netdev(netdev->id);
1074         assert(nc);
1075         nc->is_netdev = true;
1076     }
1077
1078     return 0;
1079 }
1080
1081 void show_netdevs(void)
1082 {
1083     int idx;
1084     const char *available_netdevs[] = {
1085         "socket",
1086         "hubport",
1087         "tap",
1088 #ifdef CONFIG_SLIRP
1089         "user",
1090 #endif
1091 #ifdef CONFIG_L2TPV3
1092         "l2tpv3",
1093 #endif
1094 #ifdef CONFIG_VDE
1095         "vde",
1096 #endif
1097 #ifdef CONFIG_NET_BRIDGE
1098         "bridge",
1099 #endif
1100 #ifdef CONFIG_NETMAP
1101         "netmap",
1102 #endif
1103 #ifdef CONFIG_POSIX
1104         "vhost-user",
1105 #endif
1106 #ifdef CONFIG_VHOST_VDPA
1107         "vhost-vdpa",
1108 #endif
1109     };
1110
1111     qemu_printf("Available netdev backend types:\n");
1112     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1113         qemu_printf("%s\n", available_netdevs[idx]);
1114     }
1115 }
1116
1117 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1118 {
1119     gchar **substrings = NULL;
1120     Netdev *object = NULL;
1121     int ret = -1;
1122     Visitor *v = opts_visitor_new(opts);
1123
1124     /* Parse convenience option format ip6-net=fec0::0[/64] */
1125     const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1126
1127     if (ip6_net) {
1128         char *prefix_addr;
1129         unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1130
1131         substrings = g_strsplit(ip6_net, "/", 2);
1132         if (!substrings || !substrings[0]) {
1133             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1134                        "a valid IPv6 prefix");
1135             goto out;
1136         }
1137
1138         prefix_addr = substrings[0];
1139
1140         /* Handle user-specified prefix length. */
1141         if (substrings[1] &&
1142             qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1143         {
1144             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1145                        "ipv6-prefixlen", "a number");
1146             goto out;
1147         }
1148
1149         qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1150         qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1151                             &error_abort);
1152         qemu_opt_unset(opts, "ipv6-net");
1153     }
1154
1155     /* Create an ID for -net if the user did not specify one */
1156     if (!is_netdev && !qemu_opts_id(opts)) {
1157         qemu_opts_set_id(opts, id_generate(ID_NET));
1158     }
1159
1160     if (visit_type_Netdev(v, NULL, &object, errp)) {
1161         ret = net_client_init1(object, is_netdev, errp);
1162     }
1163
1164     qapi_free_Netdev(object);
1165
1166 out:
1167     g_strfreev(substrings);
1168     visit_free(v);
1169     return ret;
1170 }
1171
1172 void netdev_add(QemuOpts *opts, Error **errp)
1173 {
1174     net_client_init(opts, true, errp);
1175 }
1176
1177 void qmp_netdev_add(Netdev *netdev, Error **errp)
1178 {
1179     if (!id_wellformed(netdev->id)) {
1180         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
1181         return;
1182     }
1183
1184     net_client_init1(netdev, true, errp);
1185 }
1186
1187 void qmp_netdev_del(const char *id, Error **errp)
1188 {
1189     NetClientState *nc;
1190     QemuOpts *opts;
1191
1192     nc = qemu_find_netdev(id);
1193     if (!nc) {
1194         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1195                   "Device '%s' not found", id);
1196         return;
1197     }
1198
1199     if (!nc->is_netdev) {
1200         error_setg(errp, "Device '%s' is not a netdev", id);
1201         return;
1202     }
1203
1204     qemu_del_net_client(nc);
1205
1206     /*
1207      * Wart: we need to delete the QemuOpts associated with netdevs
1208      * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in
1209      * HMP netdev_add.
1210      */
1211     opts = qemu_opts_find(qemu_find_opts("netdev"), id);
1212     if (opts) {
1213         qemu_opts_del(opts);
1214     }
1215 }
1216
1217 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1218 {
1219     char *str;
1220     ObjectProperty *prop;
1221     ObjectPropertyIterator iter;
1222     Visitor *v;
1223
1224     /* generate info str */
1225     object_property_iter_init(&iter, OBJECT(nf));
1226     while ((prop = object_property_iter_next(&iter))) {
1227         if (!strcmp(prop->name, "type")) {
1228             continue;
1229         }
1230         v = string_output_visitor_new(false, &str);
1231         object_property_get(OBJECT(nf), prop->name, v, NULL);
1232         visit_complete(v, &str);
1233         visit_free(v);
1234         monitor_printf(mon, ",%s=%s", prop->name, str);
1235         g_free(str);
1236     }
1237     monitor_printf(mon, "\n");
1238 }
1239
1240 void print_net_client(Monitor *mon, NetClientState *nc)
1241 {
1242     NetFilterState *nf;
1243
1244     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1245                    nc->queue_index,
1246                    NetClientDriver_str(nc->info->type),
1247                    nc->info_str);
1248     if (!QTAILQ_EMPTY(&nc->filters)) {
1249         monitor_printf(mon, "filters:\n");
1250     }
1251     QTAILQ_FOREACH(nf, &nc->filters, next) {
1252         monitor_printf(mon, "  - %s: type=%s",
1253                        object_get_canonical_path_component(OBJECT(nf)),
1254                        object_get_typename(OBJECT(nf)));
1255         netfilter_print_info(mon, nf);
1256     }
1257 }
1258
1259 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1260                                       Error **errp)
1261 {
1262     NetClientState *nc;
1263     RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
1264
1265     QTAILQ_FOREACH(nc, &net_clients, next) {
1266         RxFilterInfo *info;
1267
1268         if (has_name && strcmp(nc->name, name) != 0) {
1269             continue;
1270         }
1271
1272         /* only query rx-filter information of NIC */
1273         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1274             if (has_name) {
1275                 error_setg(errp, "net client(%s) isn't a NIC", name);
1276                 assert(!filter_list);
1277                 return NULL;
1278             }
1279             continue;
1280         }
1281
1282         /* only query information on queue 0 since the info is per nic,
1283          * not per queue
1284          */
1285         if (nc->queue_index != 0)
1286             continue;
1287
1288         if (nc->info->query_rx_filter) {
1289             info = nc->info->query_rx_filter(nc);
1290             QAPI_LIST_APPEND(tail, info);
1291         } else if (has_name) {
1292             error_setg(errp, "net client(%s) doesn't support"
1293                        " rx-filter querying", name);
1294             assert(!filter_list);
1295             return NULL;
1296         }
1297
1298         if (has_name) {
1299             break;
1300         }
1301     }
1302
1303     if (filter_list == NULL && has_name) {
1304         error_setg(errp, "invalid net client name: %s", name);
1305     }
1306
1307     return filter_list;
1308 }
1309
1310 void hmp_info_network(Monitor *mon, const QDict *qdict)
1311 {
1312     NetClientState *nc, *peer;
1313     NetClientDriver type;
1314
1315     net_hub_info(mon);
1316
1317     QTAILQ_FOREACH(nc, &net_clients, next) {
1318         peer = nc->peer;
1319         type = nc->info->type;
1320
1321         /* Skip if already printed in hub info */
1322         if (net_hub_id_for_client(nc, NULL) == 0) {
1323             continue;
1324         }
1325
1326         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1327             print_net_client(mon, nc);
1328         } /* else it's a netdev connected to a NIC, printed with the NIC */
1329         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1330             monitor_printf(mon, " \\ ");
1331             print_net_client(mon, peer);
1332         }
1333     }
1334 }
1335
1336 void colo_notify_filters_event(int event, Error **errp)
1337 {
1338     NetClientState *nc;
1339     NetFilterState *nf;
1340     NetFilterClass *nfc = NULL;
1341     Error *local_err = NULL;
1342
1343     QTAILQ_FOREACH(nc, &net_clients, next) {
1344         QTAILQ_FOREACH(nf, &nc->filters, next) {
1345             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1346             nfc->handle_event(nf, event, &local_err);
1347             if (local_err) {
1348                 error_propagate(errp, local_err);
1349                 return;
1350             }
1351         }
1352     }
1353 }
1354
1355 void qmp_set_link(const char *name, bool up, Error **errp)
1356 {
1357     NetClientState *ncs[MAX_QUEUE_NUM];
1358     NetClientState *nc;
1359     int queues, i;
1360
1361     queues = qemu_find_net_clients_except(name, ncs,
1362                                           NET_CLIENT_DRIVER__MAX,
1363                                           MAX_QUEUE_NUM);
1364
1365     if (queues == 0) {
1366         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1367                   "Device '%s' not found", name);
1368         return;
1369     }
1370     nc = ncs[0];
1371
1372     for (i = 0; i < queues; i++) {
1373         ncs[i]->link_down = !up;
1374     }
1375
1376     if (nc->info->link_status_changed) {
1377         nc->info->link_status_changed(nc);
1378     }
1379
1380     if (nc->peer) {
1381         /* Change peer link only if the peer is NIC and then notify peer.
1382          * If the peer is a HUBPORT or a backend, we do not change the
1383          * link status.
1384          *
1385          * This behavior is compatible with qemu hubs where there could be
1386          * multiple clients that can still communicate with each other in
1387          * disconnected mode. For now maintain this compatibility.
1388          */
1389         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1390             for (i = 0; i < queues; i++) {
1391                 ncs[i]->peer->link_down = !up;
1392             }
1393         }
1394         if (nc->peer->info->link_status_changed) {
1395             nc->peer->info->link_status_changed(nc->peer);
1396         }
1397     }
1398 }
1399
1400 static void net_vm_change_state_handler(void *opaque, bool running,
1401                                         RunState state)
1402 {
1403     NetClientState *nc;
1404     NetClientState *tmp;
1405
1406     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1407         if (running) {
1408             /* Flush queued packets and wake up backends. */
1409             if (nc->peer && qemu_can_send_packet(nc)) {
1410                 qemu_flush_queued_packets(nc->peer);
1411             }
1412         } else {
1413             /* Complete all queued packets, to guarantee we don't modify
1414              * state later when VM is not running.
1415              */
1416             qemu_flush_or_purge_queued_packets(nc, true);
1417         }
1418     }
1419 }
1420
1421 void net_cleanup(void)
1422 {
1423     NetClientState *nc;
1424
1425     /*cleanup colo compare module for COLO*/
1426     colo_compare_cleanup();
1427
1428     /* We may del multiple entries during qemu_del_net_client(),
1429      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1430      */
1431     while (!QTAILQ_EMPTY(&net_clients)) {
1432         nc = QTAILQ_FIRST(&net_clients);
1433         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1434             qemu_del_nic(qemu_get_nic(nc));
1435         } else {
1436             qemu_del_net_client(nc);
1437         }
1438     }
1439
1440     qemu_del_vm_change_state_handler(net_change_state_entry);
1441 }
1442
1443 void net_check_clients(void)
1444 {
1445     NetClientState *nc;
1446     int i;
1447
1448     net_hub_check_clients();
1449
1450     QTAILQ_FOREACH(nc, &net_clients, next) {
1451         if (!nc->peer) {
1452             warn_report("%s %s has no peer",
1453                         nc->info->type == NET_CLIENT_DRIVER_NIC
1454                         ? "nic" : "netdev",
1455                         nc->name);
1456         }
1457     }
1458
1459     /* Check that all NICs requested via -net nic actually got created.
1460      * NICs created via -device don't need to be checked here because
1461      * they are always instantiated.
1462      */
1463     for (i = 0; i < MAX_NICS; i++) {
1464         NICInfo *nd = &nd_table[i];
1465         if (nd->used && !nd->instantiated) {
1466             warn_report("requested NIC (%s, model %s) "
1467                         "was not created (not supported by this machine?)",
1468                         nd->name ? nd->name : "anonymous",
1469                         nd->model ? nd->model : "unspecified");
1470         }
1471     }
1472 }
1473
1474 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1475 {
1476     return net_client_init(opts, false, errp);
1477 }
1478
1479 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1480 {
1481     const char *type = qemu_opt_get(opts, "type");
1482
1483     if (type && is_help_option(type)) {
1484         show_netdevs();
1485         exit(0);
1486     }
1487     return net_client_init(opts, true, errp);
1488 }
1489
1490 /* For the convenience "--nic" parameter */
1491 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1492 {
1493     char *mac, *nd_id;
1494     int idx, ret;
1495     NICInfo *ni;
1496     const char *type;
1497
1498     type = qemu_opt_get(opts, "type");
1499     if (type && g_str_equal(type, "none")) {
1500         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1501     }
1502
1503     idx = nic_get_free_idx();
1504     if (idx == -1 || nb_nics >= MAX_NICS) {
1505         error_setg(errp, "no more on-board/default NIC slots available");
1506         return -1;
1507     }
1508
1509     if (!type) {
1510         qemu_opt_set(opts, "type", "user", &error_abort);
1511     }
1512
1513     ni = &nd_table[idx];
1514     memset(ni, 0, sizeof(*ni));
1515     ni->model = qemu_opt_get_del(opts, "model");
1516
1517     /* Create an ID if the user did not specify one */
1518     nd_id = g_strdup(qemu_opts_id(opts));
1519     if (!nd_id) {
1520         nd_id = id_generate(ID_NET);
1521         qemu_opts_set_id(opts, nd_id);
1522     }
1523
1524     /* Handle MAC address */
1525     mac = qemu_opt_get_del(opts, "mac");
1526     if (mac) {
1527         ret = net_parse_macaddr(ni->macaddr.a, mac);
1528         g_free(mac);
1529         if (ret) {
1530             error_setg(errp, "invalid syntax for ethernet address");
1531             goto out;
1532         }
1533         if (is_multicast_ether_addr(ni->macaddr.a)) {
1534             error_setg(errp, "NIC cannot have multicast MAC address");
1535             ret = -1;
1536             goto out;
1537         }
1538     }
1539     qemu_macaddr_default_if_unset(&ni->macaddr);
1540
1541     ret = net_client_init(opts, true, errp);
1542     if (ret == 0) {
1543         ni->netdev = qemu_find_netdev(nd_id);
1544         ni->used = true;
1545         nb_nics++;
1546     }
1547
1548 out:
1549     g_free(nd_id);
1550     return ret;
1551 }
1552
1553 int net_init_clients(Error **errp)
1554 {
1555     net_change_state_entry =
1556         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1557
1558     QTAILQ_INIT(&net_clients);
1559
1560     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1561                           net_init_netdev, NULL, errp)) {
1562         return -1;
1563     }
1564
1565     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1566         return -1;
1567     }
1568
1569     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1570         return -1;
1571     }
1572
1573     return 0;
1574 }
1575
1576 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1577 {
1578     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1579         return -1;
1580     }
1581
1582     return 0;
1583 }
1584
1585 /* From FreeBSD */
1586 /* XXX: optimize */
1587 uint32_t net_crc32(const uint8_t *p, int len)
1588 {
1589     uint32_t crc;
1590     int carry, i, j;
1591     uint8_t b;
1592
1593     crc = 0xffffffff;
1594     for (i = 0; i < len; i++) {
1595         b = *p++;
1596         for (j = 0; j < 8; j++) {
1597             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1598             crc <<= 1;
1599             b >>= 1;
1600             if (carry) {
1601                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1602             }
1603         }
1604     }
1605
1606     return crc;
1607 }
1608
1609 uint32_t net_crc32_le(const uint8_t *p, int len)
1610 {
1611     uint32_t crc;
1612     int carry, i, j;
1613     uint8_t b;
1614
1615     crc = 0xffffffff;
1616     for (i = 0; i < len; i++) {
1617         b = *p++;
1618         for (j = 0; j < 8; j++) {
1619             carry = (crc & 0x1) ^ (b & 0x01);
1620             crc >>= 1;
1621             b >>= 1;
1622             if (carry) {
1623                 crc ^= POLYNOMIAL_LE;
1624             }
1625         }
1626     }
1627
1628     return crc;
1629 }
1630
1631 QemuOptsList qemu_netdev_opts = {
1632     .name = "netdev",
1633     .implied_opt_name = "type",
1634     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1635     .desc = {
1636         /*
1637          * no elements => accept any params
1638          * validation will happen later
1639          */
1640         { /* end of list */ }
1641     },
1642 };
1643
1644 QemuOptsList qemu_nic_opts = {
1645     .name = "nic",
1646     .implied_opt_name = "type",
1647     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1648     .desc = {
1649         /*
1650          * no elements => accept any params
1651          * validation will happen later
1652          */
1653         { /* end of list */ }
1654     },
1655 };
1656
1657 QemuOptsList qemu_net_opts = {
1658     .name = "net",
1659     .implied_opt_name = "type",
1660     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1661     .desc = {
1662         /*
1663          * no elements => accept any params
1664          * validation will happen later
1665          */
1666         { /* end of list */ }
1667     },
1668 };
1669
1670 void net_socket_rs_init(SocketReadState *rs,
1671                         SocketReadStateFinalize *finalize,
1672                         bool vnet_hdr)
1673 {
1674     rs->state = 0;
1675     rs->vnet_hdr = vnet_hdr;
1676     rs->index = 0;
1677     rs->packet_len = 0;
1678     rs->vnet_hdr_len = 0;
1679     memset(rs->buf, 0, sizeof(rs->buf));
1680     rs->finalize = finalize;
1681 }
1682
1683 /*
1684  * Returns
1685  * 0: success
1686  * -1: error occurs
1687  */
1688 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1689 {
1690     unsigned int l;
1691
1692     while (size > 0) {
1693         /* Reassemble a packet from the network.
1694          * 0 = getting length.
1695          * 1 = getting vnet header length.
1696          * 2 = getting data.
1697          */
1698         switch (rs->state) {
1699         case 0:
1700             l = 4 - rs->index;
1701             if (l > size) {
1702                 l = size;
1703             }
1704             memcpy(rs->buf + rs->index, buf, l);
1705             buf += l;
1706             size -= l;
1707             rs->index += l;
1708             if (rs->index == 4) {
1709                 /* got length */
1710                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1711                 rs->index = 0;
1712                 if (rs->vnet_hdr) {
1713                     rs->state = 1;
1714                 } else {
1715                     rs->state = 2;
1716                     rs->vnet_hdr_len = 0;
1717                 }
1718             }
1719             break;
1720         case 1:
1721             l = 4 - rs->index;
1722             if (l > size) {
1723                 l = size;
1724             }
1725             memcpy(rs->buf + rs->index, buf, l);
1726             buf += l;
1727             size -= l;
1728             rs->index += l;
1729             if (rs->index == 4) {
1730                 /* got vnet header length */
1731                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1732                 rs->index = 0;
1733                 rs->state = 2;
1734             }
1735             break;
1736         case 2:
1737             l = rs->packet_len - rs->index;
1738             if (l > size) {
1739                 l = size;
1740             }
1741             if (rs->index + l <= sizeof(rs->buf)) {
1742                 memcpy(rs->buf + rs->index, buf, l);
1743             } else {
1744                 fprintf(stderr, "serious error: oversized packet received,"
1745                     "connection terminated.\n");
1746                 rs->index = rs->state = 0;
1747                 return -1;
1748             }
1749
1750             rs->index += l;
1751             buf += l;
1752             size -= l;
1753             if (rs->index >= rs->packet_len) {
1754                 rs->index = 0;
1755                 rs->state = 0;
1756                 assert(rs->finalize);
1757                 rs->finalize(rs);
1758             }
1759             break;
1760         }
1761     }
1762
1763     assert(size == 0);
1764     return 0;
1765 }