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 "util.h"
  31
  32 #include "monitor/monitor.h"
  33 #include "qemu-common.h"
  34 #include "qemu/sockets.h"
  35 #include "qemu/config-file.h"
  36 #include "qmp-commands.h"
  37 #include "hw/qdev.h"
  38 #include "qemu/iov.h"
  39 #include "qapi-visit.h"
  40 #include "qapi/opts-visitor.h"
  41 #include "qapi/dealloc-visitor.h"
  42
  43 /* Net bridge is currently not supported for W32. */
  44 #if !defined(_WIN32)
  45 # define CONFIG_NET_BRIDGE
  46 #endif
  47
  48 static QTAILQ_HEAD(, NetClientState) net_clients;
  49
  50 int default_net = 1;
  51
  52 /***********************************************************/
  53 /* network device redirectors */
  54
  55 #if defined(DEBUG_NET)
  56 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  57 {
  58     int len, i, j, c;
  59
  60     for(i=0;i<size;i+=16) {
  61         len = size - i;
  62         if (len > 16)
  63             len = 16;
  64         fprintf(f, "%08x ", i);
  65         for(j=0;j<16;j++) {
  66             if (j < len)
  67                 fprintf(f, " %02x", buf[i+j]);
  68             else
  69                 fprintf(f, "   ");
  70         }
  71         fprintf(f, " ");
  72         for(j=0;j<len;j++) {
  73             c = buf[i+j];
  74             if (c < ' ' || c > '~')
  75                 c = '.';
  76             fprintf(f, "%c", c);
  77         }
  78         fprintf(f, "\n");
  79     }
  80 }
  81 #endif
  82
  83 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  84 {
  85     const char *p, *p1;
  86     int len;
  87     p = *pp;
  88     p1 = strchr(p, sep);
  89     if (!p1)
  90         return -1;
  91     len = p1 - p;
  92     p1++;
  93     if (buf_size > 0) {
  94         if (len > buf_size - 1)
  95             len = buf_size - 1;
  96         memcpy(buf, p, len);
  97         buf[len] = '\0';
  98     }
  99     *pp = p1;
 100     return 0;
 101 }
 102
 103 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 104 {
 105     char buf[512];
 106     struct hostent *he;
 107     const char *p, *r;
 108     int port;
 109
 110     p = str;
 111     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 112         return -1;
 113     saddr->sin_family = AF_INET;
 114     if (buf[0] == '\0') {
 115         saddr->sin_addr.s_addr = 0;
 116     } else {
 117         if (qemu_isdigit(buf[0])) {
 118             if (!inet_aton(buf, &saddr->sin_addr))
 119                 return -1;
 120         } else {
 121             if ((he = gethostbyname(buf)) == NULL)
 122                 return - 1;
 123             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 124         }
 125     }
 126     port = strtol(p, (char **)&r, 0);
 127     if (r == p)
 128         return -1;
 129     saddr->sin_port = htons(port);
 130     return 0;
 131 }
 132
 133 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 134 {
 135     snprintf(nc->info_str, sizeof(nc->info_str),
 136              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 137              nc->model,
 138              macaddr[0], macaddr[1], macaddr[2],
 139              macaddr[3], macaddr[4], macaddr[5]);
 140 }
 141
 142 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 143 {
 144     static int index = 0;
 145     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 146
 147     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 148         return;
 149     macaddr->a[0] = 0x52;
 150     macaddr->a[1] = 0x54;
 151     macaddr->a[2] = 0x00;
 152     macaddr->a[3] = 0x12;
 153     macaddr->a[4] = 0x34;
 154     macaddr->a[5] = 0x56 + index++;
 155 }
 156
 157 /**
 158  * Generate a name for net client
 159  *
 160  * Only net clients created with the legacy -net option need this.  Naming is
 161  * mandatory for net clients created with -netdev.
 162  */
 163 static char *assign_name(NetClientState *nc1, const char *model)
 164 {
 165     NetClientState *nc;
 166     char buf[256];
 167     int id = 0;
 168
 169     QTAILQ_FOREACH(nc, &net_clients, next) {
 170         if (nc == nc1) {
 171             continue;
 172         }
 173         /* For compatibility only bump id for net clients on a vlan */
 174         if (strcmp(nc->model, model) == 0 &&
 175             net_hub_id_for_client(nc, NULL) == 0) {
 176             id++;
 177         }
 178     }
 179
 180     snprintf(buf, sizeof(buf), "%s.%d", model, id);
 181
 182     return g_strdup(buf);
 183 }
 184
 185 NetClientState *qemu_new_net_client(NetClientInfo *info,
 186                                     NetClientState *peer,
 187                                     const char *model,
 188                                     const char *name)
 189 {
 190     NetClientState *nc;
 191
 192     assert(info->size >= sizeof(NetClientState));
 193
 194     nc = g_malloc0(info->size);
 195
 196     nc->info = info;
 197     nc->model = g_strdup(model);
 198     if (name) {
 199         nc->name = g_strdup(name);
 200     } else {
 201         nc->name = assign_name(nc, model);
 202     }
 203
 204     if (peer) {
 205         assert(!peer->peer);
 206         nc->peer = peer;
 207         peer->peer = nc;
 208     }
 209     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 210
 211     nc->send_queue = qemu_new_net_queue(nc);
 212
 213     return nc;
 214 }
 215
 216 NICState *qemu_new_nic(NetClientInfo *info,
 217                        NICConf *conf,
 218                        const char *model,
 219                        const char *name,
 220                        void *opaque)
 221 {
 222     NetClientState *nc;
 223     NICState *nic;
 224
 225     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 226     assert(info->size >= sizeof(NICState));
 227
 228     nc = qemu_new_net_client(info, conf->peer, model, name);
 229
 230     nic = DO_UPCAST(NICState, nc, nc);
 231     nic->conf = conf;
 232     nic->opaque = opaque;
 233
 234     return nic;
 235 }
 236
 237 static void qemu_cleanup_net_client(NetClientState *nc)
 238 {
 239     QTAILQ_REMOVE(&net_clients, nc, next);
 240
 241     if (nc->info->cleanup) {
 242         nc->info->cleanup(nc);
 243     }
 244 }
 245
 246 static void qemu_free_net_client(NetClientState *nc)
 247 {
 248     if (nc->send_queue) {
 249         qemu_del_net_queue(nc->send_queue);
 250     }
 251     if (nc->peer) {
 252         nc->peer->peer = NULL;
 253     }
 254     g_free(nc->name);
 255     g_free(nc->model);
 256     g_free(nc);
 257 }
 258
 259 void qemu_del_net_client(NetClientState *nc)
 260 {
 261     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 262     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 263         NICState *nic = DO_UPCAST(NICState, nc, nc->peer);
 264         if (nic->peer_deleted) {
 265             return;
 266         }
 267         nic->peer_deleted = true;
 268         /* Let NIC know peer is gone. */
 269         nc->peer->link_down = true;
 270         if (nc->peer->info->link_status_changed) {
 271             nc->peer->info->link_status_changed(nc->peer);
 272         }
 273         qemu_cleanup_net_client(nc);
 274         return;
 275     }
 276
 277     /* If this is a peer NIC and peer has already been deleted, free it now. */
 278     if (nc->peer && nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 279         NICState *nic = DO_UPCAST(NICState, nc, nc);
 280         if (nic->peer_deleted) {
 281             qemu_free_net_client(nc->peer);
 282         }
 283     }
 284
 285     qemu_cleanup_net_client(nc);
 286     qemu_free_net_client(nc);
 287 }
 288
 289 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 290 {
 291     NetClientState *nc;
 292
 293     QTAILQ_FOREACH(nc, &net_clients, next) {
 294         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 295             func(DO_UPCAST(NICState, nc, nc), opaque);
 296         }
 297     }
 298 }
 299
 300 int qemu_can_send_packet(NetClientState *sender)
 301 {
 302     if (!sender->peer) {
 303         return 1;
 304     }
 305
 306     if (sender->peer->receive_disabled) {
 307         return 0;
 308     } else if (sender->peer->info->can_receive &&
 309                !sender->peer->info->can_receive(sender->peer)) {
 310         return 0;
 311     }
 312     return 1;
 313 }
 314
 315 ssize_t qemu_deliver_packet(NetClientState *sender,
 316                             unsigned flags,
 317                             const uint8_t *data,
 318                             size_t size,
 319                             void *opaque)
 320 {
 321     NetClientState *nc = opaque;
 322     ssize_t ret;
 323
 324     if (nc->link_down) {
 325         return size;
 326     }
 327
 328     if (nc->receive_disabled) {
 329         return 0;
 330     }
 331
 332     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 333         ret = nc->info->receive_raw(nc, data, size);
 334     } else {
 335         ret = nc->info->receive(nc, data, size);
 336     }
 337
 338     if (ret == 0) {
 339         nc->receive_disabled = 1;
 340     };
 341
 342     return ret;
 343 }
 344
 345 void qemu_purge_queued_packets(NetClientState *nc)
 346 {
 347     if (!nc->peer) {
 348         return;
 349     }
 350
 351     qemu_net_queue_purge(nc->peer->send_queue, nc);
 352 }
 353
 354 void qemu_flush_queued_packets(NetClientState *nc)
 355 {
 356     nc->receive_disabled = 0;
 357
 358     if (qemu_net_queue_flush(nc->send_queue)) {
 359         /* We emptied the queue successfully, signal to the IO thread to repoll
 360          * the file descriptor (for tap, for example).
 361          */
 362         qemu_notify_event();
 363     }
 364 }
 365
 366 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 367                                                  unsigned flags,
 368                                                  const uint8_t *buf, int size,
 369                                                  NetPacketSent *sent_cb)
 370 {
 371     NetQueue *queue;
 372
 373 #ifdef DEBUG_NET
 374     printf("qemu_send_packet_async:\n");
 375     hex_dump(stdout, buf, size);
 376 #endif
 377
 378     if (sender->link_down || !sender->peer) {
 379         return size;
 380     }
 381
 382     queue = sender->peer->send_queue;
 383
 384     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 385 }
 386
 387 ssize_t qemu_send_packet_async(NetClientState *sender,
 388                                const uint8_t *buf, int size,
 389                                NetPacketSent *sent_cb)
 390 {
 391     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 392                                              buf, size, sent_cb);
 393 }
 394
 395 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 396 {
 397     qemu_send_packet_async(nc, buf, size, NULL);
 398 }
 399
 400 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 401 {
 402     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 403                                              buf, size, NULL);
 404 }
 405
 406 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 407                                int iovcnt)
 408 {
 409     uint8_t buffer[4096];
 410     size_t offset;
 411
 412     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 413
 414     return nc->info->receive(nc, buffer, offset);
 415 }
 416
 417 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 418                                 unsigned flags,
 419                                 const struct iovec *iov,
 420                                 int iovcnt,
 421                                 void *opaque)
 422 {
 423     NetClientState *nc = opaque;
 424     int ret;
 425
 426     if (nc->link_down) {
 427         return iov_size(iov, iovcnt);
 428     }
 429
 430     if (nc->receive_disabled) {
 431         return 0;
 432     }
 433
 434     if (nc->info->receive_iov) {
 435         ret = nc->info->receive_iov(nc, iov, iovcnt);
 436     } else {
 437         ret = nc_sendv_compat(nc, iov, iovcnt);
 438     }
 439
 440     if (ret == 0) {
 441         nc->receive_disabled = 1;
 442     }
 443
 444     return ret;
 445 }
 446
 447 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 448                                 const struct iovec *iov, int iovcnt,
 449                                 NetPacketSent *sent_cb)
 450 {
 451     NetQueue *queue;
 452
 453     if (sender->link_down || !sender->peer) {
 454         return iov_size(iov, iovcnt);
 455     }
 456
 457     queue = sender->peer->send_queue;
 458
 459     return qemu_net_queue_send_iov(queue, sender,
 460                                    QEMU_NET_PACKET_FLAG_NONE,
 461                                    iov, iovcnt, sent_cb);
 462 }
 463
 464 ssize_t
 465 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 466 {
 467     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 468 }
 469
 470 NetClientState *qemu_find_netdev(const char *id)
 471 {
 472     NetClientState *nc;
 473
 474     QTAILQ_FOREACH(nc, &net_clients, next) {
 475         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 476             continue;
 477         if (!strcmp(nc->name, id)) {
 478             return nc;
 479         }
 480     }
 481
 482     return NULL;
 483 }
 484
 485 static int nic_get_free_idx(void)
 486 {
 487     int index;
 488
 489     for (index = 0; index < MAX_NICS; index++)
 490         if (!nd_table[index].used)
 491             return index;
 492     return -1;
 493 }
 494
 495 int qemu_show_nic_models(const char *arg, const char *const *models)
 496 {
 497     int i;
 498
 499     if (!arg || !is_help_option(arg)) {
 500         return 0;
 501     }
 502
 503     fprintf(stderr, "qemu: Supported NIC models: ");
 504     for (i = 0 ; models[i]; i++)
 505         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 506     return 1;
 507 }
 508
 509 void qemu_check_nic_model(NICInfo *nd, const char *model)
 510 {
 511     const char *models[2];
 512
 513     models[0] = model;
 514     models[1] = NULL;
 515
 516     if (qemu_show_nic_models(nd->model, models))
 517         exit(0);
 518     if (qemu_find_nic_model(nd, models, model) < 0)
 519         exit(1);
 520 }
 521
 522 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 523                         const char *default_model)
 524 {
 525     int i;
 526
 527     if (!nd->model)
 528         nd->model = g_strdup(default_model);
 529
 530     for (i = 0 ; models[i]; i++) {
 531         if (strcmp(nd->model, models[i]) == 0)
 532             return i;
 533     }
 534
 535     error_report("Unsupported NIC model: %s", nd->model);
 536     return -1;
 537 }
 538
 539 static int net_init_nic(const NetClientOptions *opts, const char *name,
 540                         NetClientState *peer)
 541 {
 542     int idx;
 543     NICInfo *nd;
 544     const NetLegacyNicOptions *nic;
 545
 546     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 547     nic = opts->nic;
 548
 549     idx = nic_get_free_idx();
 550     if (idx == -1 || nb_nics >= MAX_NICS) {
 551         error_report("Too Many NICs");
 552         return -1;
 553     }
 554
 555     nd = &nd_table[idx];
 556
 557     memset(nd, 0, sizeof(*nd));
 558
 559     if (nic->has_netdev) {
 560         nd->netdev = qemu_find_netdev(nic->netdev);
 561         if (!nd->netdev) {
 562             error_report("netdev '%s' not found", nic->netdev);
 563             return -1;
 564         }
 565     } else {
 566         assert(peer);
 567         nd->netdev = peer;
 568     }
 569     if (name) {
 570         nd->name = g_strdup(name);
 571     }
 572     if (nic->has_model) {
 573         nd->model = g_strdup(nic->model);
 574     }
 575     if (nic->has_addr) {
 576         nd->devaddr = g_strdup(nic->addr);
 577     }
 578
 579     if (nic->has_macaddr &&
 580         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 581         error_report("invalid syntax for ethernet address");
 582         return -1;
 583     }
 584     qemu_macaddr_default_if_unset(&nd->macaddr);
 585
 586     if (nic->has_vectors) {
 587         if (nic->vectors > 0x7ffffff) {
 588             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 589             return -1;
 590         }
 591         nd->nvectors = nic->vectors;
 592     } else {
 593         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 594     }
 595
 596     nd->used = 1;
 597     nb_nics++;
 598
 599     return idx;
 600 }
 601
 602
 603 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 604     const NetClientOptions *opts,
 605     const char *name,
 606     NetClientState *peer) = {
 607         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 608 #ifdef CONFIG_SLIRP
 609         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 610 #endif
 611         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 612         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 613 #ifdef CONFIG_VDE
 614         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 615 #endif
 616         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 617 #ifdef CONFIG_NET_BRIDGE
 618         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 619 #endif
 620         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 621 };
 622
 623
 624 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 625 {
 626     union {
 627         const Netdev    *netdev;
 628         const NetLegacy *net;
 629     } u;
 630     const NetClientOptions *opts;
 631     const char *name;
 632
 633     if (is_netdev) {
 634         u.netdev = object;
 635         opts = u.netdev->opts;
 636         name = u.netdev->id;
 637
 638         switch (opts->kind) {
 639 #ifdef CONFIG_SLIRP
 640         case NET_CLIENT_OPTIONS_KIND_USER:
 641 #endif
 642         case NET_CLIENT_OPTIONS_KIND_TAP:
 643         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 644 #ifdef CONFIG_VDE
 645         case NET_CLIENT_OPTIONS_KIND_VDE:
 646 #endif
 647 #ifdef CONFIG_NET_BRIDGE
 648         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 649 #endif
 650         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 651             break;
 652
 653         default:
 654             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 655                       "a netdev backend type");
 656             return -1;
 657         }
 658     } else {
 659         u.net = object;
 660         opts = u.net->opts;
 661         /* missing optional values have been initialized to "all bits zero" */
 662         name = u.net->has_id ? u.net->id : u.net->name;
 663     }
 664
 665     if (net_client_init_fun[opts->kind]) {
 666         NetClientState *peer = NULL;
 667
 668         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 669          * parameter. */
 670         if (!is_netdev &&
 671             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 672              !opts->nic->has_netdev)) {
 673             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 674         }
 675
 676         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 677             /* TODO push error reporting into init() methods */
 678             error_set(errp, QERR_DEVICE_INIT_FAILED,
 679                       NetClientOptionsKind_lookup[opts->kind]);
 680             return -1;
 681         }
 682     }
 683     return 0;
 684 }
 685
 686
 687 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 688 {
 689     if (is_netdev) {
 690         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 691     } else {
 692         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 693     }
 694 }
 695
 696
 697 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 698 {
 699     void *object = NULL;
 700     Error *err = NULL;
 701     int ret = -1;
 702
 703     {
 704         OptsVisitor *ov = opts_visitor_new(opts);
 705
 706         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 707         opts_visitor_cleanup(ov);
 708     }
 709
 710     if (!err) {
 711         ret = net_client_init1(object, is_netdev, &err);
 712     }
 713
 714     if (object) {
 715         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 716
 717         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 718         qapi_dealloc_visitor_cleanup(dv);
 719     }
 720
 721     error_propagate(errp, err);
 722     return ret;
 723 }
 724
 725
 726 static int net_host_check_device(const char *device)
 727 {
 728     int i;
 729     const char *valid_param_list[] = { "tap", "socket", "dump"
 730 #ifdef CONFIG_NET_BRIDGE
 731                                        , "bridge"
 732 #endif
 733 #ifdef CONFIG_SLIRP
 734                                        ,"user"
 735 #endif
 736 #ifdef CONFIG_VDE
 737                                        ,"vde"
 738 #endif
 739     };
 740     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
 741         if (!strncmp(valid_param_list[i], device,
 742                      strlen(valid_param_list[i])))
 743             return 1;
 744     }
 745
 746     return 0;
 747 }
 748
 749 void net_host_device_add(Monitor *mon, const QDict *qdict)
 750 {
 751     const char *device = qdict_get_str(qdict, "device");
 752     const char *opts_str = qdict_get_try_str(qdict, "opts");
 753     Error *local_err = NULL;
 754     QemuOpts *opts;
 755
 756     if (!net_host_check_device(device)) {
 757         monitor_printf(mon, "invalid host network device %s\n", device);
 758         return;
 759     }
 760
 761     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 762     if (!opts) {
 763         return;
 764     }
 765
 766     qemu_opt_set(opts, "type", device);
 767
 768     net_client_init(opts, 0, &local_err);
 769     if (error_is_set(&local_err)) {
 770         qerror_report_err(local_err);
 771         error_free(local_err);
 772         monitor_printf(mon, "adding host network device %s failed\n", device);
 773     }
 774 }
 775
 776 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 777 {
 778     NetClientState *nc;
 779     int vlan_id = qdict_get_int(qdict, "vlan_id");
 780     const char *device = qdict_get_str(qdict, "device");
 781
 782     nc = net_hub_find_client_by_name(vlan_id, device);
 783     if (!nc) {
 784         return;
 785     }
 786     if (!net_host_check_device(nc->model)) {
 787         monitor_printf(mon, "invalid host network device %s\n", device);
 788         return;
 789     }
 790     qemu_del_net_client(nc);
 791 }
 792
 793 void netdev_add(QemuOpts *opts, Error **errp)
 794 {
 795     net_client_init(opts, 1, errp);
 796 }
 797
 798 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 799 {
 800     Error *local_err = NULL;
 801     QemuOptsList *opts_list;
 802     QemuOpts *opts;
 803
 804     opts_list = qemu_find_opts_err("netdev", &local_err);
 805     if (error_is_set(&local_err)) {
 806         goto exit_err;
 807     }
 808
 809     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
 810     if (error_is_set(&local_err)) {
 811         goto exit_err;
 812     }
 813
 814     netdev_add(opts, &local_err);
 815     if (error_is_set(&local_err)) {
 816         qemu_opts_del(opts);
 817         goto exit_err;
 818     }
 819
 820     return 0;
 821
 822 exit_err:
 823     qerror_report_err(local_err);
 824     error_free(local_err);
 825     return -1;
 826 }
 827
 828 void qmp_netdev_del(const char *id, Error **errp)
 829 {
 830     NetClientState *nc;
 831     QemuOpts *opts;
 832
 833     nc = qemu_find_netdev(id);
 834     if (!nc) {
 835         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
 836         return;
 837     }
 838
 839     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
 840     if (!opts) {
 841         error_setg(errp, "Device '%s' is not a netdev", id);
 842         return;
 843     }
 844
 845     qemu_del_net_client(nc);
 846     qemu_opts_del(opts);
 847 }
 848
 849 void print_net_client(Monitor *mon, NetClientState *nc)
 850 {
 851     monitor_printf(mon, "%s: type=%s,%s\n", nc->name,
 852                    NetClientOptionsKind_lookup[nc->info->type], nc->info_str);
 853 }
 854
 855 void do_info_network(Monitor *mon, const QDict *qdict)
 856 {
 857     NetClientState *nc, *peer;
 858     NetClientOptionsKind type;
 859
 860     net_hub_info(mon);
 861
 862     QTAILQ_FOREACH(nc, &net_clients, next) {
 863         peer = nc->peer;
 864         type = nc->info->type;
 865
 866         /* Skip if already printed in hub info */
 867         if (net_hub_id_for_client(nc, NULL) == 0) {
 868             continue;
 869         }
 870
 871         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
 872             print_net_client(mon, nc);
 873         } /* else it's a netdev connected to a NIC, printed with the NIC */
 874         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
 875             monitor_printf(mon, " \\ ");
 876             print_net_client(mon, peer);
 877         }
 878     }
 879 }
 880
 881 void qmp_set_link(const char *name, bool up, Error **errp)
 882 {
 883     NetClientState *nc = NULL;
 884
 885     QTAILQ_FOREACH(nc, &net_clients, next) {
 886         if (!strcmp(nc->name, name)) {
 887             goto done;
 888         }
 889     }
 890 done:
 891     if (!nc) {
 892         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
 893         return;
 894     }
 895
 896     nc->link_down = !up;
 897
 898     if (nc->info->link_status_changed) {
 899         nc->info->link_status_changed(nc);
 900     }
 901
 902     /* Notify peer. Don't update peer link status: this makes it possible to
 903      * disconnect from host network without notifying the guest.
 904      * FIXME: is disconnected link status change operation useful?
 905      *
 906      * Current behaviour is compatible with qemu vlans where there could be
 907      * multiple clients that can still communicate with each other in
 908      * disconnected mode. For now maintain this compatibility. */
 909     if (nc->peer && nc->peer->info->link_status_changed) {
 910         nc->peer->info->link_status_changed(nc->peer);
 911     }
 912 }
 913
 914 void net_cleanup(void)
 915 {
 916     NetClientState *nc, *next_vc;
 917
 918     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, next_vc) {
 919         qemu_del_net_client(nc);
 920     }
 921 }
 922
 923 void net_check_clients(void)
 924 {
 925     NetClientState *nc;
 926     int i;
 927
 928     /* Don't warn about the default network setup that you get if
 929      * no command line -net or -netdev options are specified. There
 930      * are two cases that we would otherwise complain about:
 931      * (1) board doesn't support a NIC but the implicit "-net nic"
 932      * requested one
 933      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
 934      * sets up a nic that isn't connected to anything.
 935      */
 936     if (default_net) {
 937         return;
 938     }
 939
 940     net_hub_check_clients();
 941
 942     QTAILQ_FOREACH(nc, &net_clients, next) {
 943         if (!nc->peer) {
 944             fprintf(stderr, "Warning: %s %s has no peer\n",
 945                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
 946                     "nic" : "netdev", nc->name);
 947         }
 948     }
 949
 950     /* Check that all NICs requested via -net nic actually got created.
 951      * NICs created via -device don't need to be checked here because
 952      * they are always instantiated.
 953      */
 954     for (i = 0; i < MAX_NICS; i++) {
 955         NICInfo *nd = &nd_table[i];
 956         if (nd->used && !nd->instantiated) {
 957             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
 958                     "was not created (not supported by this machine?)\n",
 959                     nd->name ? nd->name : "anonymous",
 960                     nd->model ? nd->model : "unspecified");
 961         }
 962     }
 963 }
 964
 965 static int net_init_client(QemuOpts *opts, void *dummy)
 966 {
 967     Error *local_err = NULL;
 968
 969     net_client_init(opts, 0, &local_err);
 970     if (error_is_set(&local_err)) {
 971         qerror_report_err(local_err);
 972         error_free(local_err);
 973         return -1;
 974     }
 975
 976     return 0;
 977 }
 978
 979 static int net_init_netdev(QemuOpts *opts, void *dummy)
 980 {
 981     Error *local_err = NULL;
 982     int ret;
 983
 984     ret = net_client_init(opts, 1, &local_err);
 985     if (error_is_set(&local_err)) {
 986         qerror_report_err(local_err);
 987         error_free(local_err);
 988         return -1;
 989     }
 990
 991     return ret;
 992 }
 993
 994 int net_init_clients(void)
 995 {
 996     QemuOptsList *net = qemu_find_opts("net");
 997
 998     if (default_net) {
 999         /* if no clients, we use a default config */
1000         qemu_opts_set(net, NULL, "type", "nic");
1001 #ifdef CONFIG_SLIRP
1002         qemu_opts_set(net, NULL, "type", "user");
1003 #endif
1004     }
1005
1006     QTAILQ_INIT(&net_clients);
1007
1008     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1009         return -1;
1010
1011     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1012         return -1;
1013     }
1014
1015     return 0;
1016 }
1017
1018 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1019 {
1020 #if defined(CONFIG_SLIRP)
1021     int ret;
1022     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1023         return ret;
1024     }
1025 #endif
1026
1027     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1028         return -1;
1029     }
1030
1031     default_net = 0;
1032     return 0;
1033 }
1034
1035 /* From FreeBSD */
1036 /* XXX: optimize */
1037 unsigned compute_mcast_idx(const uint8_t *ep)
1038 {
1039     uint32_t crc;
1040     int carry, i, j;
1041     uint8_t b;
1042
1043     crc = 0xffffffff;
1044     for (i = 0; i < 6; i++) {
1045         b = *ep++;
1046         for (j = 0; j < 8; j++) {
1047             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1048             crc <<= 1;
1049             b >>= 1;
1050             if (carry) {
1051                 crc = ((crc ^ POLYNOMIAL) | carry);
1052             }
1053         }
1054     }
1055     return crc >> 26;
1056 }
1057
1058 QemuOptsList qemu_netdev_opts = {
1059     .name = "netdev",
1060     .implied_opt_name = "type",
1061     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1062     .desc = {
1063         /*
1064          * no elements => accept any params
1065          * validation will happen later
1066          */
1067         { /* end of list */ }
1068     },
1069 };
1070
1071 QemuOptsList qemu_net_opts = {
1072     .name = "net",
1073     .implied_opt_name = "type",
1074     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1075     .desc = {
1076         /*
1077          * no elements => accept any params
1078          * validation will happen later
1079          */
1080         { /* end of list */ }
1081     },
1082 };