net/net.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "config-host.h"
  25
  26 #include "net/net.h"
  27 #include "clients.h"
  28 #include "hub.h"
  29 #include "net/slirp.h"
  30 #include "net/eth.h"
  31 #include "util.h"
  32
  33 #include "monitor/monitor.h"
  34 #include "qemu-common.h"
  35 #include "qemu/sockets.h"
  36 #include "qemu/config-file.h"
  37 #include "qmp-commands.h"
  38 #include "hw/qdev.h"
  39 #include "qemu/iov.h"
  40 #include "qemu/main-loop.h"
  41 #include "qapi-visit.h"
  42 #include "qapi/opts-visitor.h"
  43 #include "qapi/dealloc-visitor.h"
  44 #include "sysemu/sysemu.h"
  45
  46 /* Net bridge is currently not supported for W32. */
  47 #if !defined(_WIN32)
  48 # define CONFIG_NET_BRIDGE
  49 #endif
  50
  51 static VMChangeStateEntry *net_change_state_entry;
  52 static QTAILQ_HEAD(, NetClientState) net_clients;
  53
  54 const char *host_net_devices[] = {
  55     "tap",
  56     "socket",
  57     "dump",
  58 #ifdef CONFIG_NET_BRIDGE
  59     "bridge",
  60 #endif
  61 #ifdef CONFIG_SLIRP
  62     "user",
  63 #endif
  64 #ifdef CONFIG_VDE
  65     "vde",
  66 #endif
  67     "vhost-user",
  68     NULL,
  69 };
  70
  71 int default_net = 1;
  72
  73 /***********************************************************/
  74 /* network device redirectors */
  75
  76 #if defined(DEBUG_NET)
  77 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  78 {
  79     int len, i, j, c;
  80
  81     for(i=0;i<size;i+=16) {
  82         len = size - i;
  83         if (len > 16)
  84             len = 16;
  85         fprintf(f, "%08x ", i);
  86         for(j=0;j<16;j++) {
  87             if (j < len)
  88                 fprintf(f, " %02x", buf[i+j]);
  89             else
  90                 fprintf(f, "   ");
  91         }
  92         fprintf(f, " ");
  93         for(j=0;j<len;j++) {
  94             c = buf[i+j];
  95             if (c < ' ' || c > '~')
  96                 c = '.';
  97             fprintf(f, "%c", c);
  98         }
  99         fprintf(f, "\n");
 100     }
 101 }
 102 #endif
 103
 104 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
 105 {
 106     const char *p, *p1;
 107     int len;
 108     p = *pp;
 109     p1 = strchr(p, sep);
 110     if (!p1)
 111         return -1;
 112     len = p1 - p;
 113     p1++;
 114     if (buf_size > 0) {
 115         if (len > buf_size - 1)
 116             len = buf_size - 1;
 117         memcpy(buf, p, len);
 118         buf[len] = '\0';
 119     }
 120     *pp = p1;
 121     return 0;
 122 }
 123
 124 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 125 {
 126     char buf[512];
 127     struct hostent *he;
 128     const char *p, *r;
 129     int port;
 130
 131     p = str;
 132     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 133         return -1;
 134     saddr->sin_family = AF_INET;
 135     if (buf[0] == '\0') {
 136         saddr->sin_addr.s_addr = 0;
 137     } else {
 138         if (qemu_isdigit(buf[0])) {
 139             if (!inet_aton(buf, &saddr->sin_addr))
 140                 return -1;
 141         } else {
 142             if ((he = gethostbyname(buf)) == NULL)
 143                 return - 1;
 144             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 145         }
 146     }
 147     port = strtol(p, (char **)&r, 0);
 148     if (r == p)
 149         return -1;
 150     saddr->sin_port = htons(port);
 151     return 0;
 152 }
 153
 154 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 155 {
 156     snprintf(nc->info_str, sizeof(nc->info_str),
 157              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 158              nc->model,
 159              macaddr[0], macaddr[1], macaddr[2],
 160              macaddr[3], macaddr[4], macaddr[5]);
 161 }
 162
 163 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 164 {
 165     static int index = 0;
 166     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 167
 168     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 169         return;
 170     macaddr->a[0] = 0x52;
 171     macaddr->a[1] = 0x54;
 172     macaddr->a[2] = 0x00;
 173     macaddr->a[3] = 0x12;
 174     macaddr->a[4] = 0x34;
 175     macaddr->a[5] = 0x56 + index++;
 176 }
 177
 178 /**
 179  * Generate a name for net client
 180  *
 181  * Only net clients created with the legacy -net option and NICs need this.
 182  */
 183 static char *assign_name(NetClientState *nc1, const char *model)
 184 {
 185     NetClientState *nc;
 186     int id = 0;
 187
 188     QTAILQ_FOREACH(nc, &net_clients, next) {
 189         if (nc == nc1) {
 190             continue;
 191         }
 192         if (strcmp(nc->model, model) == 0) {
 193             id++;
 194         }
 195     }
 196
 197     return g_strdup_printf("%s.%d", model, id);
 198 }
 199
 200 static void qemu_net_client_destructor(NetClientState *nc)
 201 {
 202     g_free(nc);
 203 }
 204
 205 static void qemu_net_client_setup(NetClientState *nc,
 206                                   NetClientInfo *info,
 207                                   NetClientState *peer,
 208                                   const char *model,
 209                                   const char *name,
 210                                   NetClientDestructor *destructor)
 211 {
 212     nc->info = info;
 213     nc->model = g_strdup(model);
 214     if (name) {
 215         nc->name = g_strdup(name);
 216     } else {
 217         nc->name = assign_name(nc, model);
 218     }
 219
 220     if (peer) {
 221         assert(!peer->peer);
 222         nc->peer = peer;
 223         peer->peer = nc;
 224     }
 225     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 226
 227     nc->incoming_queue = qemu_new_net_queue(nc);
 228     nc->destructor = destructor;
 229 }
 230
 231 NetClientState *qemu_new_net_client(NetClientInfo *info,
 232                                     NetClientState *peer,
 233                                     const char *model,
 234                                     const char *name)
 235 {
 236     NetClientState *nc;
 237
 238     assert(info->size >= sizeof(NetClientState));
 239
 240     nc = g_malloc0(info->size);
 241     qemu_net_client_setup(nc, info, peer, model, name,
 242                           qemu_net_client_destructor);
 243
 244     return nc;
 245 }
 246
 247 NICState *qemu_new_nic(NetClientInfo *info,
 248                        NICConf *conf,
 249                        const char *model,
 250                        const char *name,
 251                        void *opaque)
 252 {
 253     NetClientState **peers = conf->peers.ncs;
 254     NICState *nic;
 255     int i, queues = MAX(1, conf->peers.queues);
 256
 257     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 258     assert(info->size >= sizeof(NICState));
 259
 260     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 261     nic->ncs = (void *)nic + info->size;
 262     nic->conf = conf;
 263     nic->opaque = opaque;
 264
 265     for (i = 0; i < queues; i++) {
 266         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 267                               NULL);
 268         nic->ncs[i].queue_index = i;
 269     }
 270
 271     return nic;
 272 }
 273
 274 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 275 {
 276     return nic->ncs + queue_index;
 277 }
 278
 279 NetClientState *qemu_get_queue(NICState *nic)
 280 {
 281     return qemu_get_subqueue(nic, 0);
 282 }
 283
 284 NICState *qemu_get_nic(NetClientState *nc)
 285 {
 286     NetClientState *nc0 = nc - nc->queue_index;
 287
 288     return (NICState *)((void *)nc0 - nc->info->size);
 289 }
 290
 291 void *qemu_get_nic_opaque(NetClientState *nc)
 292 {
 293     NICState *nic = qemu_get_nic(nc);
 294
 295     return nic->opaque;
 296 }
 297
 298 static void qemu_cleanup_net_client(NetClientState *nc)
 299 {
 300     QTAILQ_REMOVE(&net_clients, nc, next);
 301
 302     if (nc->info->cleanup) {
 303         nc->info->cleanup(nc);
 304     }
 305 }
 306
 307 static void qemu_free_net_client(NetClientState *nc)
 308 {
 309     if (nc->incoming_queue) {
 310         qemu_del_net_queue(nc->incoming_queue);
 311     }
 312     if (nc->peer) {
 313         nc->peer->peer = NULL;
 314     }
 315     g_free(nc->name);
 316     g_free(nc->model);
 317     if (nc->destructor) {
 318         nc->destructor(nc);
 319     }
 320 }
 321
 322 void qemu_del_net_client(NetClientState *nc)
 323 {
 324     NetClientState *ncs[MAX_QUEUE_NUM];
 325     int queues, i;
 326
 327     /* If the NetClientState belongs to a multiqueue backend, we will change all
 328      * other NetClientStates also.
 329      */
 330     queues = qemu_find_net_clients_except(nc->name, ncs,
 331                                           NET_CLIENT_OPTIONS_KIND_NIC,
 332                                           MAX_QUEUE_NUM);
 333     assert(queues != 0);
 334
 335     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 336     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 337         NICState *nic = qemu_get_nic(nc->peer);
 338         if (nic->peer_deleted) {
 339             return;
 340         }
 341         nic->peer_deleted = true;
 342
 343         for (i = 0; i < queues; i++) {
 344             ncs[i]->peer->link_down = true;
 345         }
 346
 347         if (nc->peer->info->link_status_changed) {
 348             nc->peer->info->link_status_changed(nc->peer);
 349         }
 350
 351         for (i = 0; i < queues; i++) {
 352             qemu_cleanup_net_client(ncs[i]);
 353         }
 354
 355         return;
 356     }
 357
 358     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 359
 360     for (i = 0; i < queues; i++) {
 361         qemu_cleanup_net_client(ncs[i]);
 362         qemu_free_net_client(ncs[i]);
 363     }
 364 }
 365
 366 void qemu_del_nic(NICState *nic)
 367 {
 368     int i, queues = MAX(nic->conf->peers.queues, 1);
 369
 370     /* If this is a peer NIC and peer has already been deleted, free it now. */
 371     if (nic->peer_deleted) {
 372         for (i = 0; i < queues; i++) {
 373             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 374         }
 375     }
 376
 377     for (i = queues - 1; i >= 0; i--) {
 378         NetClientState *nc = qemu_get_subqueue(nic, i);
 379
 380         qemu_cleanup_net_client(nc);
 381         qemu_free_net_client(nc);
 382     }
 383
 384     g_free(nic);
 385 }
 386
 387 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 388 {
 389     NetClientState *nc;
 390
 391     QTAILQ_FOREACH(nc, &net_clients, next) {
 392         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 393             if (nc->queue_index == 0) {
 394                 func(qemu_get_nic(nc), opaque);
 395             }
 396         }
 397     }
 398 }
 399
 400 bool qemu_has_ufo(NetClientState *nc)
 401 {
 402     if (!nc || !nc->info->has_ufo) {
 403         return false;
 404     }
 405
 406     return nc->info->has_ufo(nc);
 407 }
 408
 409 bool qemu_has_vnet_hdr(NetClientState *nc)
 410 {
 411     if (!nc || !nc->info->has_vnet_hdr) {
 412         return false;
 413     }
 414
 415     return nc->info->has_vnet_hdr(nc);
 416 }
 417
 418 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 419 {
 420     if (!nc || !nc->info->has_vnet_hdr_len) {
 421         return false;
 422     }
 423
 424     return nc->info->has_vnet_hdr_len(nc, len);
 425 }
 426
 427 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 428 {
 429     if (!nc || !nc->info->using_vnet_hdr) {
 430         return;
 431     }
 432
 433     nc->info->using_vnet_hdr(nc, enable);
 434 }
 435
 436 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 437                           int ecn, int ufo)
 438 {
 439     if (!nc || !nc->info->set_offload) {
 440         return;
 441     }
 442
 443     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 444 }
 445
 446 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 447 {
 448     if (!nc || !nc->info->set_vnet_hdr_len) {
 449         return;
 450     }
 451
 452     nc->info->set_vnet_hdr_len(nc, len);
 453 }
 454
 455 int qemu_can_send_packet(NetClientState *sender)
 456 {
 457     int vm_running = runstate_is_running();
 458
 459     if (!vm_running) {
 460         return 0;
 461     }
 462
 463     if (!sender->peer) {
 464         return 1;
 465     }
 466
 467     if (sender->peer->receive_disabled) {
 468         return 0;
 469     } else if (sender->peer->info->can_receive &&
 470                !sender->peer->info->can_receive(sender->peer)) {
 471         return 0;
 472     }
 473     return 1;
 474 }
 475
 476 ssize_t qemu_deliver_packet(NetClientState *sender,
 477                             unsigned flags,
 478                             const uint8_t *data,
 479                             size_t size,
 480                             void *opaque)
 481 {
 482     NetClientState *nc = opaque;
 483     ssize_t ret;
 484
 485     if (nc->link_down) {
 486         return size;
 487     }
 488
 489     if (nc->receive_disabled) {
 490         return 0;
 491     }
 492
 493     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 494         ret = nc->info->receive_raw(nc, data, size);
 495     } else {
 496         ret = nc->info->receive(nc, data, size);
 497     }
 498
 499     if (ret == 0) {
 500         nc->receive_disabled = 1;
 501     }
 502
 503     return ret;
 504 }
 505
 506 void qemu_purge_queued_packets(NetClientState *nc)
 507 {
 508     if (!nc->peer) {
 509         return;
 510     }
 511
 512     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 513 }
 514
 515 static
 516 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 517 {
 518     nc->receive_disabled = 0;
 519
 520     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 521         if (net_hub_flush(nc->peer)) {
 522             qemu_notify_event();
 523         }
 524     }
 525     if (qemu_net_queue_flush(nc->incoming_queue)) {
 526         /* We emptied the queue successfully, signal to the IO thread to repoll
 527          * the file descriptor (for tap, for example).
 528          */
 529         qemu_notify_event();
 530     } else if (purge) {
 531         /* Unable to empty the queue, purge remaining packets */
 532         qemu_net_queue_purge(nc->incoming_queue, nc);
 533     }
 534 }
 535
 536 void qemu_flush_queued_packets(NetClientState *nc)
 537 {
 538     qemu_flush_or_purge_queued_packets(nc, false);
 539 }
 540
 541 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 542                                                  unsigned flags,
 543                                                  const uint8_t *buf, int size,
 544                                                  NetPacketSent *sent_cb)
 545 {
 546     NetQueue *queue;
 547
 548 #ifdef DEBUG_NET
 549     printf("qemu_send_packet_async:\n");
 550     hex_dump(stdout, buf, size);
 551 #endif
 552
 553     if (sender->link_down || !sender->peer) {
 554         return size;
 555     }
 556
 557     queue = sender->peer->incoming_queue;
 558
 559     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 560 }
 561
 562 ssize_t qemu_send_packet_async(NetClientState *sender,
 563                                const uint8_t *buf, int size,
 564                                NetPacketSent *sent_cb)
 565 {
 566     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 567                                              buf, size, sent_cb);
 568 }
 569
 570 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 571 {
 572     qemu_send_packet_async(nc, buf, size, NULL);
 573 }
 574
 575 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 576 {
 577     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 578                                              buf, size, NULL);
 579 }
 580
 581 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 582                                int iovcnt)
 583 {
 584     uint8_t buffer[NET_BUFSIZE];
 585     size_t offset;
 586
 587     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 588
 589     return nc->info->receive(nc, buffer, offset);
 590 }
 591
 592 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 593                                 unsigned flags,
 594                                 const struct iovec *iov,
 595                                 int iovcnt,
 596                                 void *opaque)
 597 {
 598     NetClientState *nc = opaque;
 599     int ret;
 600
 601     if (nc->link_down) {
 602         return iov_size(iov, iovcnt);
 603     }
 604
 605     if (nc->receive_disabled) {
 606         return 0;
 607     }
 608
 609     if (nc->info->receive_iov) {
 610         ret = nc->info->receive_iov(nc, iov, iovcnt);
 611     } else {
 612         ret = nc_sendv_compat(nc, iov, iovcnt);
 613     }
 614
 615     if (ret == 0) {
 616         nc->receive_disabled = 1;
 617     }
 618
 619     return ret;
 620 }
 621
 622 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 623                                 const struct iovec *iov, int iovcnt,
 624                                 NetPacketSent *sent_cb)
 625 {
 626     NetQueue *queue;
 627
 628     if (sender->link_down || !sender->peer) {
 629         return iov_size(iov, iovcnt);
 630     }
 631
 632     queue = sender->peer->incoming_queue;
 633
 634     return qemu_net_queue_send_iov(queue, sender,
 635                                    QEMU_NET_PACKET_FLAG_NONE,
 636                                    iov, iovcnt, sent_cb);
 637 }
 638
 639 ssize_t
 640 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 641 {
 642     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 643 }
 644
 645 NetClientState *qemu_find_netdev(const char *id)
 646 {
 647     NetClientState *nc;
 648
 649     QTAILQ_FOREACH(nc, &net_clients, next) {
 650         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 651             continue;
 652         if (!strcmp(nc->name, id)) {
 653             return nc;
 654         }
 655     }
 656
 657     return NULL;
 658 }
 659
 660 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 661                                  NetClientOptionsKind type, int max)
 662 {
 663     NetClientState *nc;
 664     int ret = 0;
 665
 666     QTAILQ_FOREACH(nc, &net_clients, next) {
 667         if (nc->info->type == type) {
 668             continue;
 669         }
 670         if (!id || !strcmp(nc->name, id)) {
 671             if (ret < max) {
 672                 ncs[ret] = nc;
 673             }
 674             ret++;
 675         }
 676     }
 677
 678     return ret;
 679 }
 680
 681 static int nic_get_free_idx(void)
 682 {
 683     int index;
 684
 685     for (index = 0; index < MAX_NICS; index++)
 686         if (!nd_table[index].used)
 687             return index;
 688     return -1;
 689 }
 690
 691 int qemu_show_nic_models(const char *arg, const char *const *models)
 692 {
 693     int i;
 694
 695     if (!arg || !is_help_option(arg)) {
 696         return 0;
 697     }
 698
 699     fprintf(stderr, "qemu: Supported NIC models: ");
 700     for (i = 0 ; models[i]; i++)
 701         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 702     return 1;
 703 }
 704
 705 void qemu_check_nic_model(NICInfo *nd, const char *model)
 706 {
 707     const char *models[2];
 708
 709     models[0] = model;
 710     models[1] = NULL;
 711
 712     if (qemu_show_nic_models(nd->model, models))
 713         exit(0);
 714     if (qemu_find_nic_model(nd, models, model) < 0)
 715         exit(1);
 716 }
 717
 718 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 719                         const char *default_model)
 720 {
 721     int i;
 722
 723     if (!nd->model)
 724         nd->model = g_strdup(default_model);
 725
 726     for (i = 0 ; models[i]; i++) {
 727         if (strcmp(nd->model, models[i]) == 0)
 728             return i;
 729     }
 730
 731     error_report("Unsupported NIC model: %s", nd->model);
 732     return -1;
 733 }
 734
 735 static int net_init_nic(const NetClientOptions *opts, const char *name,
 736                         NetClientState *peer)
 737 {
 738     int idx;
 739     NICInfo *nd;
 740     const NetLegacyNicOptions *nic;
 741
 742     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 743     nic = opts->nic;
 744
 745     idx = nic_get_free_idx();
 746     if (idx == -1 || nb_nics >= MAX_NICS) {
 747         error_report("Too Many NICs");
 748         return -1;
 749     }
 750
 751     nd = &nd_table[idx];
 752
 753     memset(nd, 0, sizeof(*nd));
 754
 755     if (nic->has_netdev) {
 756         nd->netdev = qemu_find_netdev(nic->netdev);
 757         if (!nd->netdev) {
 758             error_report("netdev '%s' not found", nic->netdev);
 759             return -1;
 760         }
 761     } else {
 762         assert(peer);
 763         nd->netdev = peer;
 764     }
 765     nd->name = g_strdup(name);
 766     if (nic->has_model) {
 767         nd->model = g_strdup(nic->model);
 768     }
 769     if (nic->has_addr) {
 770         nd->devaddr = g_strdup(nic->addr);
 771     }
 772
 773     if (nic->has_macaddr &&
 774         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 775         error_report("invalid syntax for ethernet address");
 776         return -1;
 777     }
 778     if (nic->has_macaddr &&
 779         is_multicast_ether_addr(nd->macaddr.a)) {
 780         error_report("NIC cannot have multicast MAC address (odd 1st byte)");
 781         return -1;
 782     }
 783     qemu_macaddr_default_if_unset(&nd->macaddr);
 784
 785     if (nic->has_vectors) {
 786         if (nic->vectors > 0x7ffffff) {
 787             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 788             return -1;
 789         }
 790         nd->nvectors = nic->vectors;
 791     } else {
 792         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 793     }
 794
 795     nd->used = 1;
 796     nb_nics++;
 797
 798     return idx;
 799 }
 800
 801
 802 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 803     const NetClientOptions *opts,
 804     const char *name,
 805     NetClientState *peer) = {
 806         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 807 #ifdef CONFIG_SLIRP
 808         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 809 #endif
 810         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 811         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 812 #ifdef CONFIG_VDE
 813         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 814 #endif
 815 #ifdef CONFIG_NETMAP
 816         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 817 #endif
 818         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 819 #ifdef CONFIG_NET_BRIDGE
 820         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 821 #endif
 822         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 823 #ifdef CONFIG_VHOST_NET_USED
 824         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 825 #endif
 826 #ifdef CONFIG_L2TPV3
 827         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 828 #endif
 829 };
 830
 831
 832 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 833 {
 834     union {
 835         const Netdev    *netdev;
 836         const NetLegacy *net;
 837     } u;
 838     const NetClientOptions *opts;
 839     const char *name;
 840
 841     if (is_netdev) {
 842         u.netdev = object;
 843         opts = u.netdev->opts;
 844         name = u.netdev->id;
 845
 846         switch (opts->kind) {
 847 #ifdef CONFIG_SLIRP
 848         case NET_CLIENT_OPTIONS_KIND_USER:
 849 #endif
 850         case NET_CLIENT_OPTIONS_KIND_TAP:
 851         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 852 #ifdef CONFIG_VDE
 853         case NET_CLIENT_OPTIONS_KIND_VDE:
 854 #endif
 855 #ifdef CONFIG_NETMAP
 856         case NET_CLIENT_OPTIONS_KIND_NETMAP:
 857 #endif
 858 #ifdef CONFIG_NET_BRIDGE
 859         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 860 #endif
 861         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 862 #ifdef CONFIG_VHOST_NET_USED
 863         case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
 864 #endif
 865 #ifdef CONFIG_L2TPV3
 866         case NET_CLIENT_OPTIONS_KIND_L2TPV3:
 867 #endif
 868             break;
 869
 870         default:
 871             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 872                       "a netdev backend type");
 873             return -1;
 874         }
 875     } else {
 876         u.net = object;
 877         opts = u.net->opts;
 878         /* missing optional values have been initialized to "all bits zero" */
 879         name = u.net->has_id ? u.net->id : u.net->name;
 880     }
 881
 882     if (net_client_init_fun[opts->kind]) {
 883         NetClientState *peer = NULL;
 884
 885         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 886          * parameter. */
 887         if (!is_netdev &&
 888             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 889              !opts->nic->has_netdev)) {
 890             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 891         }
 892
 893         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 894             /* TODO push error reporting into init() methods */
 895             error_set(errp, QERR_DEVICE_INIT_FAILED,
 896                       NetClientOptionsKind_lookup[opts->kind]);
 897             return -1;
 898         }
 899     }
 900     return 0;
 901 }
 902
 903
 904 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 905 {
 906     if (is_netdev) {
 907         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 908     } else {
 909         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 910     }
 911 }
 912
 913
 914 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 915 {
 916     void *object = NULL;
 917     Error *err = NULL;
 918     int ret = -1;
 919
 920     {
 921         OptsVisitor *ov = opts_visitor_new(opts);
 922
 923         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 924         opts_visitor_cleanup(ov);
 925     }
 926
 927     if (!err) {
 928         ret = net_client_init1(object, is_netdev, &err);
 929     }
 930
 931     if (object) {
 932         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 933
 934         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 935         qapi_dealloc_visitor_cleanup(dv);
 936     }
 937
 938     error_propagate(errp, err);
 939     return ret;
 940 }
 941
 942
 943 static int net_host_check_device(const char *device)
 944 {
 945     int i;
 946     for (i = 0; host_net_devices[i]; i++) {
 947         if (!strncmp(host_net_devices[i], device,
 948                      strlen(host_net_devices[i]))) {
 949             return 1;
 950         }
 951     }
 952
 953     return 0;
 954 }
 955
 956 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
 957 {
 958     const char *device = qdict_get_str(qdict, "device");
 959     const char *opts_str = qdict_get_try_str(qdict, "opts");
 960     Error *local_err = NULL;
 961     QemuOpts *opts;
 962
 963     if (!net_host_check_device(device)) {
 964         monitor_printf(mon, "invalid host network device %s\n", device);
 965         return;
 966     }
 967
 968     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 969     if (!opts) {
 970         return;
 971     }
 972
 973     qemu_opt_set(opts, "type", device);
 974
 975     net_client_init(opts, 0, &local_err);
 976     if (local_err) {
 977         qerror_report_err(local_err);
 978         error_free(local_err);
 979         monitor_printf(mon, "adding host network device %s failed\n", device);
 980     }
 981 }
 982
 983 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
 984 {
 985     NetClientState *nc;
 986     int vlan_id = qdict_get_int(qdict, "vlan_id");
 987     const char *device = qdict_get_str(qdict, "device");
 988
 989     nc = net_hub_find_client_by_name(vlan_id, device);
 990     if (!nc) {
 991         error_report("Host network device '%s' on hub '%d' not found",
 992                      device, vlan_id);
 993         return;
 994     }
 995     if (!net_host_check_device(nc->model)) {
 996         error_report("invalid host network device '%s'", device);
 997         return;
 998     }
 999
1000     qemu_del_net_client(nc->peer);
1001     qemu_del_net_client(nc);
1002 }
1003
1004 void netdev_add(QemuOpts *opts, Error **errp)
1005 {
1006     net_client_init(opts, 1, errp);
1007 }
1008
1009 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
1010 {
1011     Error *local_err = NULL;
1012     QemuOptsList *opts_list;
1013     QemuOpts *opts;
1014
1015     opts_list = qemu_find_opts_err("netdev", &local_err);
1016     if (local_err) {
1017         goto exit_err;
1018     }
1019
1020     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1021     if (local_err) {
1022         goto exit_err;
1023     }
1024
1025     netdev_add(opts, &local_err);
1026     if (local_err) {
1027         qemu_opts_del(opts);
1028         goto exit_err;
1029     }
1030
1031     return 0;
1032
1033 exit_err:
1034     qerror_report_err(local_err);
1035     error_free(local_err);
1036     return -1;
1037 }
1038
1039 void qmp_netdev_del(const char *id, Error **errp)
1040 {
1041     NetClientState *nc;
1042     QemuOpts *opts;
1043
1044     nc = qemu_find_netdev(id);
1045     if (!nc) {
1046         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
1047         return;
1048     }
1049
1050     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1051     if (!opts) {
1052         error_setg(errp, "Device '%s' is not a netdev", id);
1053         return;
1054     }
1055
1056     qemu_del_net_client(nc);
1057     qemu_opts_del(opts);
1058 }
1059
1060 void print_net_client(Monitor *mon, NetClientState *nc)
1061 {
1062     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1063                    nc->queue_index,
1064                    NetClientOptionsKind_lookup[nc->info->type],
1065                    nc->info_str);
1066 }
1067
1068 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1069                                       Error **errp)
1070 {
1071     NetClientState *nc;
1072     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1073
1074     QTAILQ_FOREACH(nc, &net_clients, next) {
1075         RxFilterInfoList *entry;
1076         RxFilterInfo *info;
1077
1078         if (has_name && strcmp(nc->name, name) != 0) {
1079             continue;
1080         }
1081
1082         /* only query rx-filter information of NIC */
1083         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1084             if (has_name) {
1085                 error_setg(errp, "net client(%s) isn't a NIC", name);
1086                 return NULL;
1087             }
1088             continue;
1089         }
1090
1091         if (nc->info->query_rx_filter) {
1092             info = nc->info->query_rx_filter(nc);
1093             entry = g_malloc0(sizeof(*entry));
1094             entry->value = info;
1095
1096             if (!filter_list) {
1097                 filter_list = entry;
1098             } else {
1099                 last_entry->next = entry;
1100             }
1101             last_entry = entry;
1102         } else if (has_name) {
1103             error_setg(errp, "net client(%s) doesn't support"
1104                        " rx-filter querying", name);
1105             return NULL;
1106         }
1107
1108         if (has_name) {
1109             break;
1110         }
1111     }
1112
1113     if (filter_list == NULL && has_name) {
1114         error_setg(errp, "invalid net client name: %s", name);
1115     }
1116
1117     return filter_list;
1118 }
1119
1120 void hmp_info_network(Monitor *mon, const QDict *qdict)
1121 {
1122     NetClientState *nc, *peer;
1123     NetClientOptionsKind type;
1124
1125     net_hub_info(mon);
1126
1127     QTAILQ_FOREACH(nc, &net_clients, next) {
1128         peer = nc->peer;
1129         type = nc->info->type;
1130
1131         /* Skip if already printed in hub info */
1132         if (net_hub_id_for_client(nc, NULL) == 0) {
1133             continue;
1134         }
1135
1136         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1137             print_net_client(mon, nc);
1138         } /* else it's a netdev connected to a NIC, printed with the NIC */
1139         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1140             monitor_printf(mon, " \\ ");
1141             print_net_client(mon, peer);
1142         }
1143     }
1144 }
1145
1146 void qmp_set_link(const char *name, bool up, Error **errp)
1147 {
1148     NetClientState *ncs[MAX_QUEUE_NUM];
1149     NetClientState *nc;
1150     int queues, i;
1151
1152     queues = qemu_find_net_clients_except(name, ncs,
1153                                           NET_CLIENT_OPTIONS_KIND_MAX,
1154                                           MAX_QUEUE_NUM);
1155
1156     if (queues == 0) {
1157         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
1158         return;
1159     }
1160     nc = ncs[0];
1161
1162     for (i = 0; i < queues; i++) {
1163         ncs[i]->link_down = !up;
1164     }
1165
1166     if (nc->info->link_status_changed) {
1167         nc->info->link_status_changed(nc);
1168     }
1169
1170     if (nc->peer) {
1171         /* Change peer link only if the peer is NIC and then notify peer.
1172          * If the peer is a HUBPORT or a backend, we do not change the
1173          * link status.
1174          *
1175          * This behavior is compatible with qemu vlans where there could be
1176          * multiple clients that can still communicate with each other in
1177          * disconnected mode. For now maintain this compatibility.
1178          */
1179         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1180             for (i = 0; i < queues; i++) {
1181                 ncs[i]->peer->link_down = !up;
1182             }
1183         }
1184         if (nc->peer->info->link_status_changed) {
1185             nc->peer->info->link_status_changed(nc->peer);
1186         }
1187     }
1188 }
1189
1190 static void net_vm_change_state_handler(void *opaque, int running,
1191                                         RunState state)
1192 {
1193     /* Complete all queued packets, to guarantee we don't modify
1194      * state later when VM is not running.
1195      */
1196     if (!running) {
1197         NetClientState *nc;
1198         NetClientState *tmp;
1199
1200         QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1201             qemu_flush_or_purge_queued_packets(nc, true);
1202         }
1203     }
1204 }
1205
1206 void net_cleanup(void)
1207 {
1208     NetClientState *nc;
1209
1210     /* We may del multiple entries during qemu_del_net_client(),
1211      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1212      */
1213     while (!QTAILQ_EMPTY(&net_clients)) {
1214         nc = QTAILQ_FIRST(&net_clients);
1215         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1216             qemu_del_nic(qemu_get_nic(nc));
1217         } else {
1218             qemu_del_net_client(nc);
1219         }
1220     }
1221
1222     qemu_del_vm_change_state_handler(net_change_state_entry);
1223 }
1224
1225 void net_check_clients(void)
1226 {
1227     NetClientState *nc;
1228     int i;
1229
1230     /* Don't warn about the default network setup that you get if
1231      * no command line -net or -netdev options are specified. There
1232      * are two cases that we would otherwise complain about:
1233      * (1) board doesn't support a NIC but the implicit "-net nic"
1234      * requested one
1235      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1236      * sets up a nic that isn't connected to anything.
1237      */
1238     if (default_net) {
1239         return;
1240     }
1241
1242     net_hub_check_clients();
1243
1244     QTAILQ_FOREACH(nc, &net_clients, next) {
1245         if (!nc->peer) {
1246             fprintf(stderr, "Warning: %s %s has no peer\n",
1247                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1248                     "nic" : "netdev", nc->name);
1249         }
1250     }
1251
1252     /* Check that all NICs requested via -net nic actually got created.
1253      * NICs created via -device don't need to be checked here because
1254      * they are always instantiated.
1255      */
1256     for (i = 0; i < MAX_NICS; i++) {
1257         NICInfo *nd = &nd_table[i];
1258         if (nd->used && !nd->instantiated) {
1259             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1260                     "was not created (not supported by this machine?)\n",
1261                     nd->name ? nd->name : "anonymous",
1262                     nd->model ? nd->model : "unspecified");
1263         }
1264     }
1265 }
1266
1267 static int net_init_client(QemuOpts *opts, void *dummy)
1268 {
1269     Error *local_err = NULL;
1270
1271     net_client_init(opts, 0, &local_err);
1272     if (local_err) {
1273         qerror_report_err(local_err);
1274         error_free(local_err);
1275         return -1;
1276     }
1277
1278     return 0;
1279 }
1280
1281 static int net_init_netdev(QemuOpts *opts, void *dummy)
1282 {
1283     Error *local_err = NULL;
1284     int ret;
1285
1286     ret = net_client_init(opts, 1, &local_err);
1287     if (local_err) {
1288         qerror_report_err(local_err);
1289         error_free(local_err);
1290         return -1;
1291     }
1292
1293     return ret;
1294 }
1295
1296 int net_init_clients(void)
1297 {
1298     QemuOptsList *net = qemu_find_opts("net");
1299
1300     if (default_net) {
1301         /* if no clients, we use a default config */
1302         qemu_opts_set(net, NULL, "type", "nic");
1303 #ifdef CONFIG_SLIRP
1304         qemu_opts_set(net, NULL, "type", "user");
1305 #endif
1306     }
1307
1308     net_change_state_entry =
1309         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1310
1311     QTAILQ_INIT(&net_clients);
1312
1313     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1314         return -1;
1315
1316     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1317         return -1;
1318     }
1319
1320     return 0;
1321 }
1322
1323 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1324 {
1325 #if defined(CONFIG_SLIRP)
1326     int ret;
1327     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1328         return ret;
1329     }
1330 #endif
1331
1332     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1333         return -1;
1334     }
1335
1336     default_net = 0;
1337     return 0;
1338 }
1339
1340 /* From FreeBSD */
1341 /* XXX: optimize */
1342 unsigned compute_mcast_idx(const uint8_t *ep)
1343 {
1344     uint32_t crc;
1345     int carry, i, j;
1346     uint8_t b;
1347
1348     crc = 0xffffffff;
1349     for (i = 0; i < 6; i++) {
1350         b = *ep++;
1351         for (j = 0; j < 8; j++) {
1352             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1353             crc <<= 1;
1354             b >>= 1;
1355             if (carry) {
1356                 crc = ((crc ^ POLYNOMIAL) | carry);
1357             }
1358         }
1359     }
1360     return crc >> 26;
1361 }
1362
1363 QemuOptsList qemu_netdev_opts = {
1364     .name = "netdev",
1365     .implied_opt_name = "type",
1366     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1367     .desc = {
1368         /*
1369          * no elements => accept any params
1370          * validation will happen later
1371          */
1372         { /* end of list */ }
1373     },
1374 };
1375
1376 QemuOptsList qemu_net_opts = {
1377     .name = "net",
1378     .implied_opt_name = "type",
1379     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1380     .desc = {
1381         /*
1382          * no elements => accept any params
1383          * validation will happen later
1384          */
1385         { /* end of list */ }
1386     },
1387 };