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