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