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 NetClientState *qemu_get_queue(NICState *nic)
 238 {
 239     return &nic->nc;
 240 }
 241
 242 static void qemu_cleanup_net_client(NetClientState *nc)
 243 {
 244     QTAILQ_REMOVE(&net_clients, nc, next);
 245
 246     if (nc->info->cleanup) {
 247         nc->info->cleanup(nc);
 248     }
 249 }
 250
 251 static void qemu_free_net_client(NetClientState *nc)
 252 {
 253     if (nc->send_queue) {
 254         qemu_del_net_queue(nc->send_queue);
 255     }
 256     if (nc->peer) {
 257         nc->peer->peer = NULL;
 258     }
 259     g_free(nc->name);
 260     g_free(nc->model);
 261     g_free(nc);
 262 }
 263
 264 void qemu_del_net_client(NetClientState *nc)
 265 {
 266     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 267     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 268         NICState *nic = DO_UPCAST(NICState, nc, nc->peer);
 269         if (nic->peer_deleted) {
 270             return;
 271         }
 272         nic->peer_deleted = true;
 273         /* Let NIC know peer is gone. */
 274         nc->peer->link_down = true;
 275         if (nc->peer->info->link_status_changed) {
 276             nc->peer->info->link_status_changed(nc->peer);
 277         }
 278         qemu_cleanup_net_client(nc);
 279         return;
 280     }
 281
 282     /* If this is a peer NIC and peer has already been deleted, free it now. */
 283     if (nc->peer && nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 284         NICState *nic = DO_UPCAST(NICState, nc, nc);
 285         if (nic->peer_deleted) {
 286             qemu_free_net_client(nc->peer);
 287         }
 288     }
 289
 290     qemu_cleanup_net_client(nc);
 291     qemu_free_net_client(nc);
 292 }
 293
 294 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 295 {
 296     NetClientState *nc;
 297
 298     QTAILQ_FOREACH(nc, &net_clients, next) {
 299         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 300             func(DO_UPCAST(NICState, nc, nc), opaque);
 301         }
 302     }
 303 }
 304
 305 int qemu_can_send_packet(NetClientState *sender)
 306 {
 307     if (!sender->peer) {
 308         return 1;
 309     }
 310
 311     if (sender->peer->receive_disabled) {
 312         return 0;
 313     } else if (sender->peer->info->can_receive &&
 314                !sender->peer->info->can_receive(sender->peer)) {
 315         return 0;
 316     }
 317     return 1;
 318 }
 319
 320 ssize_t qemu_deliver_packet(NetClientState *sender,
 321                             unsigned flags,
 322                             const uint8_t *data,
 323                             size_t size,
 324                             void *opaque)
 325 {
 326     NetClientState *nc = opaque;
 327     ssize_t ret;
 328
 329     if (nc->link_down) {
 330         return size;
 331     }
 332
 333     if (nc->receive_disabled) {
 334         return 0;
 335     }
 336
 337     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 338         ret = nc->info->receive_raw(nc, data, size);
 339     } else {
 340         ret = nc->info->receive(nc, data, size);
 341     }
 342
 343     if (ret == 0) {
 344         nc->receive_disabled = 1;
 345     };
 346
 347     return ret;
 348 }
 349
 350 void qemu_purge_queued_packets(NetClientState *nc)
 351 {
 352     if (!nc->peer) {
 353         return;
 354     }
 355
 356     qemu_net_queue_purge(nc->peer->send_queue, nc);
 357 }
 358
 359 void qemu_flush_queued_packets(NetClientState *nc)
 360 {
 361     nc->receive_disabled = 0;
 362
 363     if (qemu_net_queue_flush(nc->send_queue)) {
 364         /* We emptied the queue successfully, signal to the IO thread to repoll
 365          * the file descriptor (for tap, for example).
 366          */
 367         qemu_notify_event();
 368     }
 369 }
 370
 371 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 372                                                  unsigned flags,
 373                                                  const uint8_t *buf, int size,
 374                                                  NetPacketSent *sent_cb)
 375 {
 376     NetQueue *queue;
 377
 378 #ifdef DEBUG_NET
 379     printf("qemu_send_packet_async:\n");
 380     hex_dump(stdout, buf, size);
 381 #endif
 382
 383     if (sender->link_down || !sender->peer) {
 384         return size;
 385     }
 386
 387     queue = sender->peer->send_queue;
 388
 389     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 390 }
 391
 392 ssize_t qemu_send_packet_async(NetClientState *sender,
 393                                const uint8_t *buf, int size,
 394                                NetPacketSent *sent_cb)
 395 {
 396     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 397                                              buf, size, sent_cb);
 398 }
 399
 400 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 401 {
 402     qemu_send_packet_async(nc, buf, size, NULL);
 403 }
 404
 405 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 406 {
 407     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 408                                              buf, size, NULL);
 409 }
 410
 411 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 412                                int iovcnt)
 413 {
 414     uint8_t buffer[4096];
 415     size_t offset;
 416
 417     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 418
 419     return nc->info->receive(nc, buffer, offset);
 420 }
 421
 422 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 423                                 unsigned flags,
 424                                 const struct iovec *iov,
 425                                 int iovcnt,
 426                                 void *opaque)
 427 {
 428     NetClientState *nc = opaque;
 429     int ret;
 430
 431     if (nc->link_down) {
 432         return iov_size(iov, iovcnt);
 433     }
 434
 435     if (nc->receive_disabled) {
 436         return 0;
 437     }
 438
 439     if (nc->info->receive_iov) {
 440         ret = nc->info->receive_iov(nc, iov, iovcnt);
 441     } else {
 442         ret = nc_sendv_compat(nc, iov, iovcnt);
 443     }
 444
 445     if (ret == 0) {
 446         nc->receive_disabled = 1;
 447     }
 448
 449     return ret;
 450 }
 451
 452 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 453                                 const struct iovec *iov, int iovcnt,
 454                                 NetPacketSent *sent_cb)
 455 {
 456     NetQueue *queue;
 457
 458     if (sender->link_down || !sender->peer) {
 459         return iov_size(iov, iovcnt);
 460     }
 461
 462     queue = sender->peer->send_queue;
 463
 464     return qemu_net_queue_send_iov(queue, sender,
 465                                    QEMU_NET_PACKET_FLAG_NONE,
 466                                    iov, iovcnt, sent_cb);
 467 }
 468
 469 ssize_t
 470 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 471 {
 472     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 473 }
 474
 475 NetClientState *qemu_find_netdev(const char *id)
 476 {
 477     NetClientState *nc;
 478
 479     QTAILQ_FOREACH(nc, &net_clients, next) {
 480         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 481             continue;
 482         if (!strcmp(nc->name, id)) {
 483             return nc;
 484         }
 485     }
 486
 487     return NULL;
 488 }
 489
 490 static int nic_get_free_idx(void)
 491 {
 492     int index;
 493
 494     for (index = 0; index < MAX_NICS; index++)
 495         if (!nd_table[index].used)
 496             return index;
 497     return -1;
 498 }
 499
 500 int qemu_show_nic_models(const char *arg, const char *const *models)
 501 {
 502     int i;
 503
 504     if (!arg || !is_help_option(arg)) {
 505         return 0;
 506     }
 507
 508     fprintf(stderr, "qemu: Supported NIC models: ");
 509     for (i = 0 ; models[i]; i++)
 510         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 511     return 1;
 512 }
 513
 514 void qemu_check_nic_model(NICInfo *nd, const char *model)
 515 {
 516     const char *models[2];
 517
 518     models[0] = model;
 519     models[1] = NULL;
 520
 521     if (qemu_show_nic_models(nd->model, models))
 522         exit(0);
 523     if (qemu_find_nic_model(nd, models, model) < 0)
 524         exit(1);
 525 }
 526
 527 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 528                         const char *default_model)
 529 {
 530     int i;
 531
 532     if (!nd->model)
 533         nd->model = g_strdup(default_model);
 534
 535     for (i = 0 ; models[i]; i++) {
 536         if (strcmp(nd->model, models[i]) == 0)
 537             return i;
 538     }
 539
 540     error_report("Unsupported NIC model: %s", nd->model);
 541     return -1;
 542 }
 543
 544 static int net_init_nic(const NetClientOptions *opts, const char *name,
 545                         NetClientState *peer)
 546 {
 547     int idx;
 548     NICInfo *nd;
 549     const NetLegacyNicOptions *nic;
 550
 551     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 552     nic = opts->nic;
 553
 554     idx = nic_get_free_idx();
 555     if (idx == -1 || nb_nics >= MAX_NICS) {
 556         error_report("Too Many NICs");
 557         return -1;
 558     }
 559
 560     nd = &nd_table[idx];
 561
 562     memset(nd, 0, sizeof(*nd));
 563
 564     if (nic->has_netdev) {
 565         nd->netdev = qemu_find_netdev(nic->netdev);
 566         if (!nd->netdev) {
 567             error_report("netdev '%s' not found", nic->netdev);
 568             return -1;
 569         }
 570     } else {
 571         assert(peer);
 572         nd->netdev = peer;
 573     }
 574     nd->name = g_strdup(name);
 575     if (nic->has_model) {
 576         nd->model = g_strdup(nic->model);
 577     }
 578     if (nic->has_addr) {
 579         nd->devaddr = g_strdup(nic->addr);
 580     }
 581
 582     if (nic->has_macaddr &&
 583         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 584         error_report("invalid syntax for ethernet address");
 585         return -1;
 586     }
 587     qemu_macaddr_default_if_unset(&nd->macaddr);
 588
 589     if (nic->has_vectors) {
 590         if (nic->vectors > 0x7ffffff) {
 591             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 592             return -1;
 593         }
 594         nd->nvectors = nic->vectors;
 595     } else {
 596         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 597     }
 598
 599     nd->used = 1;
 600     nb_nics++;
 601
 602     return idx;
 603 }
 604
 605
 606 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 607     const NetClientOptions *opts,
 608     const char *name,
 609     NetClientState *peer) = {
 610         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 611 #ifdef CONFIG_SLIRP
 612         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 613 #endif
 614         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 615         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 616 #ifdef CONFIG_VDE
 617         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 618 #endif
 619         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 620 #ifdef CONFIG_NET_BRIDGE
 621         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 622 #endif
 623         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 624 };
 625
 626
 627 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 628 {
 629     union {
 630         const Netdev    *netdev;
 631         const NetLegacy *net;
 632     } u;
 633     const NetClientOptions *opts;
 634     const char *name;
 635
 636     if (is_netdev) {
 637         u.netdev = object;
 638         opts = u.netdev->opts;
 639         name = u.netdev->id;
 640
 641         switch (opts->kind) {
 642 #ifdef CONFIG_SLIRP
 643         case NET_CLIENT_OPTIONS_KIND_USER:
 644 #endif
 645         case NET_CLIENT_OPTIONS_KIND_TAP:
 646         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 647 #ifdef CONFIG_VDE
 648         case NET_CLIENT_OPTIONS_KIND_VDE:
 649 #endif
 650 #ifdef CONFIG_NET_BRIDGE
 651         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 652 #endif
 653         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 654             break;
 655
 656         default:
 657             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 658                       "a netdev backend type");
 659             return -1;
 660         }
 661     } else {
 662         u.net = object;
 663         opts = u.net->opts;
 664         /* missing optional values have been initialized to "all bits zero" */
 665         name = u.net->has_id ? u.net->id : u.net->name;
 666     }
 667
 668     if (net_client_init_fun[opts->kind]) {
 669         NetClientState *peer = NULL;
 670
 671         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 672          * parameter. */
 673         if (!is_netdev &&
 674             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 675              !opts->nic->has_netdev)) {
 676             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 677         }
 678
 679         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 680             /* TODO push error reporting into init() methods */
 681             error_set(errp, QERR_DEVICE_INIT_FAILED,
 682                       NetClientOptionsKind_lookup[opts->kind]);
 683             return -1;
 684         }
 685     }
 686     return 0;
 687 }
 688
 689
 690 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 691 {
 692     if (is_netdev) {
 693         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 694     } else {
 695         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 696     }
 697 }
 698
 699
 700 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 701 {
 702     void *object = NULL;
 703     Error *err = NULL;
 704     int ret = -1;
 705
 706     {
 707         OptsVisitor *ov = opts_visitor_new(opts);
 708
 709         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 710         opts_visitor_cleanup(ov);
 711     }
 712
 713     if (!err) {
 714         ret = net_client_init1(object, is_netdev, &err);
 715     }
 716
 717     if (object) {
 718         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 719
 720         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 721         qapi_dealloc_visitor_cleanup(dv);
 722     }
 723
 724     error_propagate(errp, err);
 725     return ret;
 726 }
 727
 728
 729 static int net_host_check_device(const char *device)
 730 {
 731     int i;
 732     const char *valid_param_list[] = { "tap", "socket", "dump"
 733 #ifdef CONFIG_NET_BRIDGE
 734                                        , "bridge"
 735 #endif
 736 #ifdef CONFIG_SLIRP
 737                                        ,"user"
 738 #endif
 739 #ifdef CONFIG_VDE
 740                                        ,"vde"
 741 #endif
 742     };
 743     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
 744         if (!strncmp(valid_param_list[i], device,
 745                      strlen(valid_param_list[i])))
 746             return 1;
 747     }
 748
 749     return 0;
 750 }
 751
 752 void net_host_device_add(Monitor *mon, const QDict *qdict)
 753 {
 754     const char *device = qdict_get_str(qdict, "device");
 755     const char *opts_str = qdict_get_try_str(qdict, "opts");
 756     Error *local_err = NULL;
 757     QemuOpts *opts;
 758
 759     if (!net_host_check_device(device)) {
 760         monitor_printf(mon, "invalid host network device %s\n", device);
 761         return;
 762     }
 763
 764     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 765     if (!opts) {
 766         return;
 767     }
 768
 769     qemu_opt_set(opts, "type", device);
 770
 771     net_client_init(opts, 0, &local_err);
 772     if (error_is_set(&local_err)) {
 773         qerror_report_err(local_err);
 774         error_free(local_err);
 775         monitor_printf(mon, "adding host network device %s failed\n", device);
 776     }
 777 }
 778
 779 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 780 {
 781     NetClientState *nc;
 782     int vlan_id = qdict_get_int(qdict, "vlan_id");
 783     const char *device = qdict_get_str(qdict, "device");
 784
 785     nc = net_hub_find_client_by_name(vlan_id, device);
 786     if (!nc) {
 787         return;
 788     }
 789     if (!net_host_check_device(nc->model)) {
 790         monitor_printf(mon, "invalid host network device %s\n", device);
 791         return;
 792     }
 793     qemu_del_net_client(nc);
 794 }
 795
 796 void netdev_add(QemuOpts *opts, Error **errp)
 797 {
 798     net_client_init(opts, 1, errp);
 799 }
 800
 801 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 802 {
 803     Error *local_err = NULL;
 804     QemuOptsList *opts_list;
 805     QemuOpts *opts;
 806
 807     opts_list = qemu_find_opts_err("netdev", &local_err);
 808     if (error_is_set(&local_err)) {
 809         goto exit_err;
 810     }
 811
 812     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
 813     if (error_is_set(&local_err)) {
 814         goto exit_err;
 815     }
 816
 817     netdev_add(opts, &local_err);
 818     if (error_is_set(&local_err)) {
 819         qemu_opts_del(opts);
 820         goto exit_err;
 821     }
 822
 823     return 0;
 824
 825 exit_err:
 826     qerror_report_err(local_err);
 827     error_free(local_err);
 828     return -1;
 829 }
 830
 831 void qmp_netdev_del(const char *id, Error **errp)
 832 {
 833     NetClientState *nc;
 834     QemuOpts *opts;
 835
 836     nc = qemu_find_netdev(id);
 837     if (!nc) {
 838         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
 839         return;
 840     }
 841
 842     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
 843     if (!opts) {
 844         error_setg(errp, "Device '%s' is not a netdev", id);
 845         return;
 846     }
 847
 848     qemu_del_net_client(nc);
 849     qemu_opts_del(opts);
 850 }
 851
 852 void print_net_client(Monitor *mon, NetClientState *nc)
 853 {
 854     monitor_printf(mon, "%s: type=%s,%s\n", nc->name,
 855                    NetClientOptionsKind_lookup[nc->info->type], nc->info_str);
 856 }
 857
 858 void do_info_network(Monitor *mon, const QDict *qdict)
 859 {
 860     NetClientState *nc, *peer;
 861     NetClientOptionsKind type;
 862
 863     net_hub_info(mon);
 864
 865     QTAILQ_FOREACH(nc, &net_clients, next) {
 866         peer = nc->peer;
 867         type = nc->info->type;
 868
 869         /* Skip if already printed in hub info */
 870         if (net_hub_id_for_client(nc, NULL) == 0) {
 871             continue;
 872         }
 873
 874         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
 875             print_net_client(mon, nc);
 876         } /* else it's a netdev connected to a NIC, printed with the NIC */
 877         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
 878             monitor_printf(mon, " \\ ");
 879             print_net_client(mon, peer);
 880         }
 881     }
 882 }
 883
 884 void qmp_set_link(const char *name, bool up, Error **errp)
 885 {
 886     NetClientState *nc = NULL;
 887
 888     QTAILQ_FOREACH(nc, &net_clients, next) {
 889         if (!strcmp(nc->name, name)) {
 890             goto done;
 891         }
 892     }
 893 done:
 894     if (!nc) {
 895         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
 896         return;
 897     }
 898
 899     nc->link_down = !up;
 900
 901     if (nc->info->link_status_changed) {
 902         nc->info->link_status_changed(nc);
 903     }
 904
 905     /* Notify peer. Don't update peer link status: this makes it possible to
 906      * disconnect from host network without notifying the guest.
 907      * FIXME: is disconnected link status change operation useful?
 908      *
 909      * Current behaviour is compatible with qemu vlans where there could be
 910      * multiple clients that can still communicate with each other in
 911      * disconnected mode. For now maintain this compatibility. */
 912     if (nc->peer && nc->peer->info->link_status_changed) {
 913         nc->peer->info->link_status_changed(nc->peer);
 914     }
 915 }
 916
 917 void net_cleanup(void)
 918 {
 919     NetClientState *nc, *next_vc;
 920
 921     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, next_vc) {
 922         qemu_del_net_client(nc);
 923     }
 924 }
 925
 926 void net_check_clients(void)
 927 {
 928     NetClientState *nc;
 929     int i;
 930
 931     /* Don't warn about the default network setup that you get if
 932      * no command line -net or -netdev options are specified. There
 933      * are two cases that we would otherwise complain about:
 934      * (1) board doesn't support a NIC but the implicit "-net nic"
 935      * requested one
 936      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
 937      * sets up a nic that isn't connected to anything.
 938      */
 939     if (default_net) {
 940         return;
 941     }
 942
 943     net_hub_check_clients();
 944
 945     QTAILQ_FOREACH(nc, &net_clients, next) {
 946         if (!nc->peer) {
 947             fprintf(stderr, "Warning: %s %s has no peer\n",
 948                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
 949                     "nic" : "netdev", nc->name);
 950         }
 951     }
 952
 953     /* Check that all NICs requested via -net nic actually got created.
 954      * NICs created via -device don't need to be checked here because
 955      * they are always instantiated.
 956      */
 957     for (i = 0; i < MAX_NICS; i++) {
 958         NICInfo *nd = &nd_table[i];
 959         if (nd->used && !nd->instantiated) {
 960             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
 961                     "was not created (not supported by this machine?)\n",
 962                     nd->name ? nd->name : "anonymous",
 963                     nd->model ? nd->model : "unspecified");
 964         }
 965     }
 966 }
 967
 968 static int net_init_client(QemuOpts *opts, void *dummy)
 969 {
 970     Error *local_err = NULL;
 971
 972     net_client_init(opts, 0, &local_err);
 973     if (error_is_set(&local_err)) {
 974         qerror_report_err(local_err);
 975         error_free(local_err);
 976         return -1;
 977     }
 978
 979     return 0;
 980 }
 981
 982 static int net_init_netdev(QemuOpts *opts, void *dummy)
 983 {
 984     Error *local_err = NULL;
 985     int ret;
 986
 987     ret = net_client_init(opts, 1, &local_err);
 988     if (error_is_set(&local_err)) {
 989         qerror_report_err(local_err);
 990         error_free(local_err);
 991         return -1;
 992     }
 993
 994     return ret;
 995 }
 996
 997 int net_init_clients(void)
 998 {
 999     QemuOptsList *net = qemu_find_opts("net");
1000
1001     if (default_net) {
1002         /* if no clients, we use a default config */
1003         qemu_opts_set(net, NULL, "type", "nic");
1004 #ifdef CONFIG_SLIRP
1005         qemu_opts_set(net, NULL, "type", "user");
1006 #endif
1007     }
1008
1009     QTAILQ_INIT(&net_clients);
1010
1011     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1012         return -1;
1013
1014     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1015         return -1;
1016     }
1017
1018     return 0;
1019 }
1020
1021 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1022 {
1023 #if defined(CONFIG_SLIRP)
1024     int ret;
1025     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1026         return ret;
1027     }
1028 #endif
1029
1030     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1031         return -1;
1032     }
1033
1034     default_net = 0;
1035     return 0;
1036 }
1037
1038 /* From FreeBSD */
1039 /* XXX: optimize */
1040 unsigned compute_mcast_idx(const uint8_t *ep)
1041 {
1042     uint32_t crc;
1043     int carry, i, j;
1044     uint8_t b;
1045
1046     crc = 0xffffffff;
1047     for (i = 0; i < 6; i++) {
1048         b = *ep++;
1049         for (j = 0; j < 8; j++) {
1050             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1051             crc <<= 1;
1052             b >>= 1;
1053             if (carry) {
1054                 crc = ((crc ^ POLYNOMIAL) | carry);
1055             }
1056         }
1057     }
1058     return crc >> 26;
1059 }
1060
1061 QemuOptsList qemu_netdev_opts = {
1062     .name = "netdev",
1063     .implied_opt_name = "type",
1064     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1065     .desc = {
1066         /*
1067          * no elements => accept any params
1068          * validation will happen later
1069          */
1070         { /* end of list */ }
1071     },
1072 };
1073
1074 QemuOptsList qemu_net_opts = {
1075     .name = "net",
1076     .implied_opt_name = "type",
1077     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1078     .desc = {
1079         /*
1080          * no elements => accept any params
1081          * validation will happen later
1082          */
1083         { /* end of list */ }
1084     },
1085 };