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 "net.h"
  25
  26 #include "config-host.h"
  27
  28 #include "net/tap.h"
  29 #include "net/socket.h"
  30 #include "net/dump.h"
  31 #include "net/slirp.h"
  32 #include "net/vde.h"
  33 #include "net/hub.h"
  34 #include "net/util.h"
  35 #include "monitor.h"
  36 #include "qemu-common.h"
  37 #include "qemu_socket.h"
  38 #include "qmp-commands.h"
  39 #include "hw/qdev.h"
  40 #include "iov.h"
  41 #include "qapi-visit.h"
  42 #include "qapi/opts-visitor.h"
  43 #include "qapi/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 need this.  Naming is
 163  * mandatory for net clients created with -netdev.
 164  */
 165 static char *assign_name(NetClientState *nc1, const char *model)
 166 {
 167     NetClientState *nc;
 168     char buf[256];
 169     int id = 0;
 170
 171     QTAILQ_FOREACH(nc, &net_clients, next) {
 172         if (nc == nc1) {
 173             continue;
 174         }
 175         /* For compatibility only bump id for net clients on a vlan */
 176         if (strcmp(nc->model, model) == 0 &&
 177             net_hub_id_for_client(nc, NULL) == 0) {
 178             id++;
 179         }
 180     }
 181
 182     snprintf(buf, sizeof(buf), "%s.%d", model, id);
 183
 184     return g_strdup(buf);
 185 }
 186
 187 NetClientState *qemu_new_net_client(NetClientInfo *info,
 188                                     NetClientState *peer,
 189                                     const char *model,
 190                                     const char *name)
 191 {
 192     NetClientState *nc;
 193
 194     assert(info->size >= sizeof(NetClientState));
 195
 196     nc = g_malloc0(info->size);
 197
 198     nc->info = info;
 199     nc->model = g_strdup(model);
 200     if (name) {
 201         nc->name = g_strdup(name);
 202     } else {
 203         nc->name = assign_name(nc, model);
 204     }
 205
 206     if (peer) {
 207         assert(!peer->peer);
 208         nc->peer = peer;
 209         peer->peer = nc;
 210     }
 211     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 212
 213     nc->send_queue = qemu_new_net_queue(nc);
 214
 215     return nc;
 216 }
 217
 218 NICState *qemu_new_nic(NetClientInfo *info,
 219                        NICConf *conf,
 220                        const char *model,
 221                        const char *name,
 222                        void *opaque)
 223 {
 224     NetClientState *nc;
 225     NICState *nic;
 226
 227     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 228     assert(info->size >= sizeof(NICState));
 229
 230     nc = qemu_new_net_client(info, conf->peer, model, name);
 231
 232     nic = DO_UPCAST(NICState, nc, nc);
 233     nic->conf = conf;
 234     nic->opaque = opaque;
 235
 236     return nic;
 237 }
 238
 239 static void qemu_cleanup_net_client(NetClientState *nc)
 240 {
 241     QTAILQ_REMOVE(&net_clients, nc, next);
 242
 243     if (nc->info->cleanup) {
 244         nc->info->cleanup(nc);
 245     }
 246 }
 247
 248 static void qemu_free_net_client(NetClientState *nc)
 249 {
 250     if (nc->send_queue) {
 251         qemu_del_net_queue(nc->send_queue);
 252     }
 253     if (nc->peer) {
 254         nc->peer->peer = NULL;
 255     }
 256     g_free(nc->name);
 257     g_free(nc->model);
 258     g_free(nc);
 259 }
 260
 261 void qemu_del_net_client(NetClientState *nc)
 262 {
 263     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 264     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 265         NICState *nic = DO_UPCAST(NICState, nc, nc->peer);
 266         if (nic->peer_deleted) {
 267             return;
 268         }
 269         nic->peer_deleted = true;
 270         /* Let NIC know peer is gone. */
 271         nc->peer->link_down = true;
 272         if (nc->peer->info->link_status_changed) {
 273             nc->peer->info->link_status_changed(nc->peer);
 274         }
 275         qemu_cleanup_net_client(nc);
 276         return;
 277     }
 278
 279     /* If this is a peer NIC and peer has already been deleted, free it now. */
 280     if (nc->peer && nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 281         NICState *nic = DO_UPCAST(NICState, nc, nc);
 282         if (nic->peer_deleted) {
 283             qemu_free_net_client(nc->peer);
 284         }
 285     }
 286
 287     qemu_cleanup_net_client(nc);
 288     qemu_free_net_client(nc);
 289 }
 290
 291 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 292 {
 293     NetClientState *nc;
 294
 295     QTAILQ_FOREACH(nc, &net_clients, next) {
 296         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 297             func(DO_UPCAST(NICState, nc, nc), opaque);
 298         }
 299     }
 300 }
 301
 302 int qemu_can_send_packet(NetClientState *sender)
 303 {
 304     if (!sender->peer) {
 305         return 1;
 306     }
 307
 308     if (sender->peer->receive_disabled) {
 309         return 0;
 310     } else if (sender->peer->info->can_receive &&
 311                !sender->peer->info->can_receive(sender->peer)) {
 312         return 0;
 313     }
 314     return 1;
 315 }
 316
 317 ssize_t qemu_deliver_packet(NetClientState *sender,
 318                             unsigned flags,
 319                             const uint8_t *data,
 320                             size_t size,
 321                             void *opaque)
 322 {
 323     NetClientState *nc = opaque;
 324     ssize_t ret;
 325
 326     if (nc->link_down) {
 327         return size;
 328     }
 329
 330     if (nc->receive_disabled) {
 331         return 0;
 332     }
 333
 334     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 335         ret = nc->info->receive_raw(nc, data, size);
 336     } else {
 337         ret = nc->info->receive(nc, data, size);
 338     }
 339
 340     if (ret == 0) {
 341         nc->receive_disabled = 1;
 342     };
 343
 344     return ret;
 345 }
 346
 347 void qemu_purge_queued_packets(NetClientState *nc)
 348 {
 349     if (!nc->peer) {
 350         return;
 351     }
 352
 353     qemu_net_queue_purge(nc->peer->send_queue, nc);
 354 }
 355
 356 void qemu_flush_queued_packets(NetClientState *nc)
 357 {
 358     nc->receive_disabled = 0;
 359
 360     qemu_net_queue_flush(nc->send_queue);
 361 }
 362
 363 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 364                                                  unsigned flags,
 365                                                  const uint8_t *buf, int size,
 366                                                  NetPacketSent *sent_cb)
 367 {
 368     NetQueue *queue;
 369
 370 #ifdef DEBUG_NET
 371     printf("qemu_send_packet_async:\n");
 372     hex_dump(stdout, buf, size);
 373 #endif
 374
 375     if (sender->link_down || !sender->peer) {
 376         return size;
 377     }
 378
 379     queue = sender->peer->send_queue;
 380
 381     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 382 }
 383
 384 ssize_t qemu_send_packet_async(NetClientState *sender,
 385                                const uint8_t *buf, int size,
 386                                NetPacketSent *sent_cb)
 387 {
 388     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 389                                              buf, size, sent_cb);
 390 }
 391
 392 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 393 {
 394     qemu_send_packet_async(nc, buf, size, NULL);
 395 }
 396
 397 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 398 {
 399     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 400                                              buf, size, NULL);
 401 }
 402
 403 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 404                                int iovcnt)
 405 {
 406     uint8_t buffer[4096];
 407     size_t offset;
 408
 409     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 410
 411     return nc->info->receive(nc, buffer, offset);
 412 }
 413
 414 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 415                                 unsigned flags,
 416                                 const struct iovec *iov,
 417                                 int iovcnt,
 418                                 void *opaque)
 419 {
 420     NetClientState *nc = opaque;
 421
 422     if (nc->link_down) {
 423         return iov_size(iov, iovcnt);
 424     }
 425
 426     if (nc->info->receive_iov) {
 427         return nc->info->receive_iov(nc, iov, iovcnt);
 428     } else {
 429         return nc_sendv_compat(nc, iov, iovcnt);
 430     }
 431 }
 432
 433 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 434                                 const struct iovec *iov, int iovcnt,
 435                                 NetPacketSent *sent_cb)
 436 {
 437     NetQueue *queue;
 438
 439     if (sender->link_down || !sender->peer) {
 440         return iov_size(iov, iovcnt);
 441     }
 442
 443     queue = sender->peer->send_queue;
 444
 445     return qemu_net_queue_send_iov(queue, sender,
 446                                    QEMU_NET_PACKET_FLAG_NONE,
 447                                    iov, iovcnt, sent_cb);
 448 }
 449
 450 ssize_t
 451 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 452 {
 453     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 454 }
 455
 456 NetClientState *qemu_find_netdev(const char *id)
 457 {
 458     NetClientState *nc;
 459
 460     QTAILQ_FOREACH(nc, &net_clients, next) {
 461         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 462             continue;
 463         if (!strcmp(nc->name, id)) {
 464             return nc;
 465         }
 466     }
 467
 468     return NULL;
 469 }
 470
 471 static int nic_get_free_idx(void)
 472 {
 473     int index;
 474
 475     for (index = 0; index < MAX_NICS; index++)
 476         if (!nd_table[index].used)
 477             return index;
 478     return -1;
 479 }
 480
 481 int qemu_show_nic_models(const char *arg, const char *const *models)
 482 {
 483     int i;
 484
 485     if (!arg || !is_help_option(arg)) {
 486         return 0;
 487     }
 488
 489     fprintf(stderr, "qemu: Supported NIC models: ");
 490     for (i = 0 ; models[i]; i++)
 491         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 492     return 1;
 493 }
 494
 495 void qemu_check_nic_model(NICInfo *nd, const char *model)
 496 {
 497     const char *models[2];
 498
 499     models[0] = model;
 500     models[1] = NULL;
 501
 502     if (qemu_show_nic_models(nd->model, models))
 503         exit(0);
 504     if (qemu_find_nic_model(nd, models, model) < 0)
 505         exit(1);
 506 }
 507
 508 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 509                         const char *default_model)
 510 {
 511     int i;
 512
 513     if (!nd->model)
 514         nd->model = g_strdup(default_model);
 515
 516     for (i = 0 ; models[i]; i++) {
 517         if (strcmp(nd->model, models[i]) == 0)
 518             return i;
 519     }
 520
 521     error_report("Unsupported NIC model: %s", nd->model);
 522     return -1;
 523 }
 524
 525 int net_handle_fd_param(Monitor *mon, const char *param)
 526 {
 527     int fd;
 528
 529     if (!qemu_isdigit(param[0]) && mon) {
 530
 531         fd = monitor_get_fd(mon, param);
 532         if (fd == -1) {
 533             error_report("No file descriptor named %s found", param);
 534             return -1;
 535         }
 536     } else {
 537         fd = qemu_parse_fd(param);
 538     }
 539
 540     return fd;
 541 }
 542
 543 static int net_init_nic(const NetClientOptions *opts, const char *name,
 544                         NetClientState *peer)
 545 {
 546     int idx;
 547     NICInfo *nd;
 548     const NetLegacyNicOptions *nic;
 549
 550     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 551     nic = opts->nic;
 552
 553     idx = nic_get_free_idx();
 554     if (idx == -1 || nb_nics >= MAX_NICS) {
 555         error_report("Too Many NICs");
 556         return -1;
 557     }
 558
 559     nd = &nd_table[idx];
 560
 561     memset(nd, 0, sizeof(*nd));
 562
 563     if (nic->has_netdev) {
 564         nd->netdev = qemu_find_netdev(nic->netdev);
 565         if (!nd->netdev) {
 566             error_report("netdev '%s' not found", nic->netdev);
 567             return -1;
 568         }
 569     } else {
 570         assert(peer);
 571         nd->netdev = peer;
 572     }
 573     if (name) {
 574         nd->name = g_strdup(name);
 575     }
 576     if (nic->has_model) {
 577         nd->model = g_strdup(nic->model);
 578     }
 579     if (nic->has_addr) {
 580         nd->devaddr = g_strdup(nic->addr);
 581     }
 582
 583     if (nic->has_macaddr &&
 584         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 585         error_report("invalid syntax for ethernet address");
 586         return -1;
 587     }
 588     qemu_macaddr_default_if_unset(&nd->macaddr);
 589
 590     if (nic->has_vectors) {
 591         if (nic->vectors > 0x7ffffff) {
 592             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 593             return -1;
 594         }
 595         nd->nvectors = nic->vectors;
 596     } else {
 597         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 598     }
 599
 600     nd->used = 1;
 601     nb_nics++;
 602
 603     return idx;
 604 }
 605
 606
 607 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 608     const NetClientOptions *opts,
 609     const char *name,
 610     NetClientState *peer) = {
 611         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 612 #ifdef CONFIG_SLIRP
 613         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 614 #endif
 615         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 616         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 617 #ifdef CONFIG_VDE
 618         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 619 #endif
 620         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 621 #ifdef CONFIG_NET_BRIDGE
 622         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 623 #endif
 624         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 625 };
 626
 627
 628 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 629 {
 630     union {
 631         const Netdev    *netdev;
 632         const NetLegacy *net;
 633     } u;
 634     const NetClientOptions *opts;
 635     const char *name;
 636
 637     if (is_netdev) {
 638         u.netdev = object;
 639         opts = u.netdev->opts;
 640         name = u.netdev->id;
 641
 642         switch (opts->kind) {
 643 #ifdef CONFIG_SLIRP
 644         case NET_CLIENT_OPTIONS_KIND_USER:
 645 #endif
 646         case NET_CLIENT_OPTIONS_KIND_TAP:
 647         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 648 #ifdef CONFIG_VDE
 649         case NET_CLIENT_OPTIONS_KIND_VDE:
 650 #endif
 651 #ifdef CONFIG_NET_BRIDGE
 652         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 653 #endif
 654         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 655             break;
 656
 657         default:
 658             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 659                       "a netdev backend type");
 660             return -1;
 661         }
 662     } else {
 663         u.net = object;
 664         opts = u.net->opts;
 665         /* missing optional values have been initialized to "all bits zero" */
 666         name = u.net->has_id ? u.net->id : u.net->name;
 667     }
 668
 669     if (net_client_init_fun[opts->kind]) {
 670         NetClientState *peer = NULL;
 671
 672         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 673          * parameter. */
 674         if (!is_netdev &&
 675             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 676              !opts->nic->has_netdev)) {
 677             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 678         }
 679
 680         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 681             /* TODO push error reporting into init() methods */
 682             error_set(errp, QERR_DEVICE_INIT_FAILED,
 683                       NetClientOptionsKind_lookup[opts->kind]);
 684             return -1;
 685         }
 686     }
 687     return 0;
 688 }
 689
 690
 691 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 692 {
 693     if (is_netdev) {
 694         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 695     } else {
 696         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 697     }
 698 }
 699
 700
 701 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 702 {
 703     void *object = NULL;
 704     Error *err = NULL;
 705     int ret = -1;
 706
 707     {
 708         OptsVisitor *ov = opts_visitor_new(opts);
 709
 710         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 711         opts_visitor_cleanup(ov);
 712     }
 713
 714     if (!err) {
 715         ret = net_client_init1(object, is_netdev, &err);
 716     }
 717
 718     if (object) {
 719         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 720
 721         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 722         qapi_dealloc_visitor_cleanup(dv);
 723     }
 724
 725     error_propagate(errp, err);
 726     return ret;
 727 }
 728
 729
 730 static int net_host_check_device(const char *device)
 731 {
 732     int i;
 733     const char *valid_param_list[] = { "tap", "socket", "dump"
 734 #ifdef CONFIG_NET_BRIDGE
 735                                        , "bridge"
 736 #endif
 737 #ifdef CONFIG_SLIRP
 738                                        ,"user"
 739 #endif
 740 #ifdef CONFIG_VDE
 741                                        ,"vde"
 742 #endif
 743     };
 744     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
 745         if (!strncmp(valid_param_list[i], device,
 746                      strlen(valid_param_list[i])))
 747             return 1;
 748     }
 749
 750     return 0;
 751 }
 752
 753 void net_host_device_add(Monitor *mon, const QDict *qdict)
 754 {
 755     const char *device = qdict_get_str(qdict, "device");
 756     const char *opts_str = qdict_get_try_str(qdict, "opts");
 757     Error *local_err = NULL;
 758     QemuOpts *opts;
 759
 760     if (!net_host_check_device(device)) {
 761         monitor_printf(mon, "invalid host network device %s\n", device);
 762         return;
 763     }
 764
 765     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 766     if (!opts) {
 767         return;
 768     }
 769
 770     qemu_opt_set(opts, "type", device);
 771
 772     net_client_init(opts, 0, &local_err);
 773     if (error_is_set(&local_err)) {
 774         qerror_report_err(local_err);
 775         error_free(local_err);
 776         monitor_printf(mon, "adding host network device %s failed\n", device);
 777     }
 778 }
 779
 780 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 781 {
 782     NetClientState *nc;
 783     int vlan_id = qdict_get_int(qdict, "vlan_id");
 784     const char *device = qdict_get_str(qdict, "device");
 785
 786     nc = net_hub_find_client_by_name(vlan_id, device);
 787     if (!nc) {
 788         return;
 789     }
 790     if (!net_host_check_device(nc->model)) {
 791         monitor_printf(mon, "invalid host network device %s\n", device);
 792         return;
 793     }
 794     qemu_del_net_client(nc);
 795 }
 796
 797 void netdev_add(QemuOpts *opts, Error **errp)
 798 {
 799     net_client_init(opts, 1, errp);
 800 }
 801
 802 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 803 {
 804     Error *local_err = NULL;
 805     QemuOptsList *opts_list;
 806     QemuOpts *opts;
 807
 808     opts_list = qemu_find_opts_err("netdev", &local_err);
 809     if (error_is_set(&local_err)) {
 810         goto exit_err;
 811     }
 812
 813     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
 814     if (error_is_set(&local_err)) {
 815         goto exit_err;
 816     }
 817
 818     netdev_add(opts, &local_err);
 819     if (error_is_set(&local_err)) {
 820         qemu_opts_del(opts);
 821         goto exit_err;
 822     }
 823
 824     return 0;
 825
 826 exit_err:
 827     qerror_report_err(local_err);
 828     error_free(local_err);
 829     return -1;
 830 }
 831
 832 void qmp_netdev_del(const char *id, Error **errp)
 833 {
 834     NetClientState *nc;
 835
 836     nc = qemu_find_netdev(id);
 837     if (!nc) {
 838         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
 839         return;
 840     }
 841
 842     qemu_del_net_client(nc);
 843     qemu_opts_del(qemu_opts_find(qemu_find_opts_err("netdev", errp), id));
 844 }
 845
 846 void print_net_client(Monitor *mon, NetClientState *nc)
 847 {
 848     monitor_printf(mon, "%s: type=%s,%s\n", nc->name,
 849                    NetClientOptionsKind_lookup[nc->info->type], nc->info_str);
 850 }
 851
 852 void do_info_network(Monitor *mon)
 853 {
 854     NetClientState *nc, *peer;
 855     NetClientOptionsKind type;
 856
 857     net_hub_info(mon);
 858
 859     QTAILQ_FOREACH(nc, &net_clients, next) {
 860         peer = nc->peer;
 861         type = nc->info->type;
 862
 863         /* Skip if already printed in hub info */
 864         if (net_hub_id_for_client(nc, NULL) == 0) {
 865             continue;
 866         }
 867
 868         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
 869             print_net_client(mon, nc);
 870         } /* else it's a netdev connected to a NIC, printed with the NIC */
 871         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
 872             monitor_printf(mon, " \\ ");
 873             print_net_client(mon, peer);
 874         }
 875     }
 876 }
 877
 878 void qmp_set_link(const char *name, bool up, Error **errp)
 879 {
 880     NetClientState *nc = NULL;
 881
 882     QTAILQ_FOREACH(nc, &net_clients, next) {
 883         if (!strcmp(nc->name, name)) {
 884             goto done;
 885         }
 886     }
 887 done:
 888     if (!nc) {
 889         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
 890         return;
 891     }
 892
 893     nc->link_down = !up;
 894
 895     if (nc->info->link_status_changed) {
 896         nc->info->link_status_changed(nc);
 897     }
 898
 899     /* Notify peer. Don't update peer link status: this makes it possible to
 900      * disconnect from host network without notifying the guest.
 901      * FIXME: is disconnected link status change operation useful?
 902      *
 903      * Current behaviour is compatible with qemu vlans where there could be
 904      * multiple clients that can still communicate with each other in
 905      * disconnected mode. For now maintain this compatibility. */
 906     if (nc->peer && nc->peer->info->link_status_changed) {
 907         nc->peer->info->link_status_changed(nc->peer);
 908     }
 909 }
 910
 911 void net_cleanup(void)
 912 {
 913     NetClientState *nc, *next_vc;
 914
 915     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, next_vc) {
 916         qemu_del_net_client(nc);
 917     }
 918 }
 919
 920 void net_check_clients(void)
 921 {
 922     NetClientState *nc;
 923     int i;
 924
 925     /* Don't warn about the default network setup that you get if
 926      * no command line -net or -netdev options are specified. There
 927      * are two cases that we would otherwise complain about:
 928      * (1) board doesn't support a NIC but the implicit "-net nic"
 929      * requested one
 930      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
 931      * sets up a nic that isn't connected to anything.
 932      */
 933     if (default_net) {
 934         return;
 935     }
 936
 937     net_hub_check_clients();
 938
 939     QTAILQ_FOREACH(nc, &net_clients, next) {
 940         if (!nc->peer) {
 941             fprintf(stderr, "Warning: %s %s has no peer\n",
 942                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
 943                     "nic" : "netdev", nc->name);
 944         }
 945     }
 946
 947     /* Check that all NICs requested via -net nic actually got created.
 948      * NICs created via -device don't need to be checked here because
 949      * they are always instantiated.
 950      */
 951     for (i = 0; i < MAX_NICS; i++) {
 952         NICInfo *nd = &nd_table[i];
 953         if (nd->used && !nd->instantiated) {
 954             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
 955                     "was not created (not supported by this machine?)\n",
 956                     nd->name ? nd->name : "anonymous",
 957                     nd->model ? nd->model : "unspecified");
 958         }
 959     }
 960 }
 961
 962 static int net_init_client(QemuOpts *opts, void *dummy)
 963 {
 964     Error *local_err = NULL;
 965
 966     net_client_init(opts, 0, &local_err);
 967     if (error_is_set(&local_err)) {
 968         qerror_report_err(local_err);
 969         error_free(local_err);
 970         return -1;
 971     }
 972
 973     return 0;
 974 }
 975
 976 static int net_init_netdev(QemuOpts *opts, void *dummy)
 977 {
 978     Error *local_err = NULL;
 979     int ret;
 980
 981     ret = net_client_init(opts, 1, &local_err);
 982     if (error_is_set(&local_err)) {
 983         qerror_report_err(local_err);
 984         error_free(local_err);
 985         return -1;
 986     }
 987
 988     return ret;
 989 }
 990
 991 int net_init_clients(void)
 992 {
 993     QemuOptsList *net = qemu_find_opts("net");
 994
 995     if (default_net) {
 996         /* if no clients, we use a default config */
 997         qemu_opts_set(net, NULL, "type", "nic");
 998 #ifdef CONFIG_SLIRP
 999         qemu_opts_set(net, NULL, "type", "user");
1000 #endif
1001     }
1002
1003     QTAILQ_INIT(&net_clients);
1004
1005     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1006         return -1;
1007
1008     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1009         return -1;
1010     }
1011
1012     return 0;
1013 }
1014
1015 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1016 {
1017 #if defined(CONFIG_SLIRP)
1018     int ret;
1019     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1020         return ret;
1021     }
1022 #endif
1023
1024     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1025         return -1;
1026     }
1027
1028     default_net = 0;
1029     return 0;
1030 }
1031
1032 /* From FreeBSD */
1033 /* XXX: optimize */
1034 unsigned compute_mcast_idx(const uint8_t *ep)
1035 {
1036     uint32_t crc;
1037     int carry, i, j;
1038     uint8_t b;
1039
1040     crc = 0xffffffff;
1041     for (i = 0; i < 6; i++) {
1042         b = *ep++;
1043         for (j = 0; j < 8; j++) {
1044             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1045             crc <<= 1;
1046             b >>= 1;
1047             if (carry) {
1048                 crc = ((crc ^ POLYNOMIAL) | carry);
1049             }
1050         }
1051     }
1052     return crc >> 26;
1053 }