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