net.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "net.h"
  25
  26 #include "config-host.h"
  27
  28 #include "net/tap.h"
  29 #include "net/socket.h"
  30 #include "net/dump.h"
  31 #include "net/slirp.h"
  32 #include "net/vde.h"
  33 #include "net/util.h"
  34 #include "monitor.h"
  35 #include "qemu-common.h"
  36 #include "qemu_socket.h"
  37 #include "qmp-commands.h"
  38 #include "hw/qdev.h"
  39 #include "iov.h"
  40 #include "qapi-visit.h"
  41 #include "qapi/opts-visitor.h"
  42 #include "qapi/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(, VLANState) vlans;
  50 static QTAILQ_HEAD(, VLANClientState) non_vlan_clients;
  51
  52 int default_net = 1;
  53
  54 /***********************************************************/
  55 /* network device redirectors */
  56
  57 #if defined(DEBUG_NET)
  58 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  59 {
  60     int len, i, j, c;
  61
  62     for(i=0;i<size;i+=16) {
  63         len = size - i;
  64         if (len > 16)
  65             len = 16;
  66         fprintf(f, "%08x ", i);
  67         for(j=0;j<16;j++) {
  68             if (j < len)
  69                 fprintf(f, " %02x", buf[i+j]);
  70             else
  71                 fprintf(f, "   ");
  72         }
  73         fprintf(f, " ");
  74         for(j=0;j<len;j++) {
  75             c = buf[i+j];
  76             if (c < ' ' || c > '~')
  77                 c = '.';
  78             fprintf(f, "%c", c);
  79         }
  80         fprintf(f, "\n");
  81     }
  82 }
  83 #endif
  84
  85 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  86 {
  87     const char *p, *p1;
  88     int len;
  89     p = *pp;
  90     p1 = strchr(p, sep);
  91     if (!p1)
  92         return -1;
  93     len = p1 - p;
  94     p1++;
  95     if (buf_size > 0) {
  96         if (len > buf_size - 1)
  97             len = buf_size - 1;
  98         memcpy(buf, p, len);
  99         buf[len] = '\0';
 100     }
 101     *pp = p1;
 102     return 0;
 103 }
 104
 105 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 106 {
 107     char buf[512];
 108     struct hostent *he;
 109     const char *p, *r;
 110     int port;
 111
 112     p = str;
 113     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 114         return -1;
 115     saddr->sin_family = AF_INET;
 116     if (buf[0] == '\0') {
 117         saddr->sin_addr.s_addr = 0;
 118     } else {
 119         if (qemu_isdigit(buf[0])) {
 120             if (!inet_aton(buf, &saddr->sin_addr))
 121                 return -1;
 122         } else {
 123             if ((he = gethostbyname(buf)) == NULL)
 124                 return - 1;
 125             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 126         }
 127     }
 128     port = strtol(p, (char **)&r, 0);
 129     if (r == p)
 130         return -1;
 131     saddr->sin_port = htons(port);
 132     return 0;
 133 }
 134
 135 void qemu_format_nic_info_str(VLANClientState *vc, uint8_t macaddr[6])
 136 {
 137     snprintf(vc->info_str, sizeof(vc->info_str),
 138              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 139              vc->model,
 140              macaddr[0], macaddr[1], macaddr[2],
 141              macaddr[3], macaddr[4], macaddr[5]);
 142 }
 143
 144 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 145 {
 146     static int index = 0;
 147     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 148
 149     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 150         return;
 151     macaddr->a[0] = 0x52;
 152     macaddr->a[1] = 0x54;
 153     macaddr->a[2] = 0x00;
 154     macaddr->a[3] = 0x12;
 155     macaddr->a[4] = 0x34;
 156     macaddr->a[5] = 0x56 + index++;
 157 }
 158
 159 static char *assign_name(VLANClientState *vc1, const char *model)
 160 {
 161     VLANState *vlan;
 162     VLANClientState *vc;
 163     char buf[256];
 164     int id = 0;
 165
 166     QTAILQ_FOREACH(vlan, &vlans, next) {
 167         QTAILQ_FOREACH(vc, &vlan->clients, next) {
 168             if (vc != vc1 && strcmp(vc->model, model) == 0) {
 169                 id++;
 170             }
 171         }
 172     }
 173
 174     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
 175         if (vc != vc1 && strcmp(vc->model, model) == 0) {
 176             id++;
 177         }
 178     }
 179
 180     snprintf(buf, sizeof(buf), "%s.%d", model, id);
 181
 182     return g_strdup(buf);
 183 }
 184
 185 static ssize_t qemu_deliver_packet(VLANClientState *sender,
 186                                    unsigned flags,
 187                                    const uint8_t *data,
 188                                    size_t size,
 189                                    void *opaque);
 190 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
 191                                        unsigned flags,
 192                                        const struct iovec *iov,
 193                                        int iovcnt,
 194                                        void *opaque);
 195
 196 VLANClientState *qemu_new_net_client(NetClientInfo *info,
 197                                      VLANState *vlan,
 198                                      VLANClientState *peer,
 199                                      const char *model,
 200                                      const char *name)
 201 {
 202     VLANClientState *vc;
 203
 204     assert(info->size >= sizeof(VLANClientState));
 205
 206     vc = g_malloc0(info->size);
 207
 208     vc->info = info;
 209     vc->model = g_strdup(model);
 210     if (name) {
 211         vc->name = g_strdup(name);
 212     } else {
 213         vc->name = assign_name(vc, model);
 214     }
 215
 216     if (vlan) {
 217         assert(!peer);
 218         vc->vlan = vlan;
 219         QTAILQ_INSERT_TAIL(&vc->vlan->clients, vc, next);
 220     } else {
 221         if (peer) {
 222             assert(!peer->peer);
 223             vc->peer = peer;
 224             peer->peer = vc;
 225         }
 226         QTAILQ_INSERT_TAIL(&non_vlan_clients, vc, next);
 227
 228         vc->send_queue = qemu_new_net_queue(qemu_deliver_packet,
 229                                             qemu_deliver_packet_iov,
 230                                             vc);
 231     }
 232
 233     return vc;
 234 }
 235
 236 NICState *qemu_new_nic(NetClientInfo *info,
 237                        NICConf *conf,
 238                        const char *model,
 239                        const char *name,
 240                        void *opaque)
 241 {
 242     VLANClientState *nc;
 243     NICState *nic;
 244
 245     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 246     assert(info->size >= sizeof(NICState));
 247
 248     nc = qemu_new_net_client(info, conf->vlan, conf->peer, model, name);
 249
 250     nic = DO_UPCAST(NICState, nc, nc);
 251     nic->conf = conf;
 252     nic->opaque = opaque;
 253
 254     return nic;
 255 }
 256
 257 static void qemu_cleanup_vlan_client(VLANClientState *vc)
 258 {
 259     if (vc->vlan) {
 260         QTAILQ_REMOVE(&vc->vlan->clients, vc, next);
 261     } else {
 262         QTAILQ_REMOVE(&non_vlan_clients, vc, next);
 263     }
 264
 265     if (vc->info->cleanup) {
 266         vc->info->cleanup(vc);
 267     }
 268 }
 269
 270 static void qemu_free_vlan_client(VLANClientState *vc)
 271 {
 272     if (!vc->vlan) {
 273         if (vc->send_queue) {
 274             qemu_del_net_queue(vc->send_queue);
 275         }
 276         if (vc->peer) {
 277             vc->peer->peer = NULL;
 278         }
 279     }
 280     g_free(vc->name);
 281     g_free(vc->model);
 282     g_free(vc);
 283 }
 284
 285 void qemu_del_vlan_client(VLANClientState *vc)
 286 {
 287     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 288     if (!vc->vlan && vc->peer && vc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 289         NICState *nic = DO_UPCAST(NICState, nc, vc->peer);
 290         if (nic->peer_deleted) {
 291             return;
 292         }
 293         nic->peer_deleted = true;
 294         /* Let NIC know peer is gone. */
 295         vc->peer->link_down = true;
 296         if (vc->peer->info->link_status_changed) {
 297             vc->peer->info->link_status_changed(vc->peer);
 298         }
 299         qemu_cleanup_vlan_client(vc);
 300         return;
 301     }
 302
 303     /* If this is a peer NIC and peer has already been deleted, free it now. */
 304     if (!vc->vlan && vc->peer && vc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 305         NICState *nic = DO_UPCAST(NICState, nc, vc);
 306         if (nic->peer_deleted) {
 307             qemu_free_vlan_client(vc->peer);
 308         }
 309     }
 310
 311     qemu_cleanup_vlan_client(vc);
 312     qemu_free_vlan_client(vc);
 313 }
 314
 315 VLANClientState *
 316 qemu_find_vlan_client_by_name(Monitor *mon, int vlan_id,
 317                               const char *client_str)
 318 {
 319     VLANState *vlan;
 320     VLANClientState *vc;
 321
 322     vlan = qemu_find_vlan(vlan_id, 0);
 323     if (!vlan) {
 324         monitor_printf(mon, "unknown VLAN %d\n", vlan_id);
 325         return NULL;
 326     }
 327
 328     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 329         if (!strcmp(vc->name, client_str)) {
 330             break;
 331         }
 332     }
 333     if (!vc) {
 334         monitor_printf(mon, "can't find device %s on VLAN %d\n",
 335                        client_str, vlan_id);
 336     }
 337
 338     return vc;
 339 }
 340
 341 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 342 {
 343     VLANClientState *nc;
 344     VLANState *vlan;
 345
 346     QTAILQ_FOREACH(nc, &non_vlan_clients, next) {
 347         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 348             func(DO_UPCAST(NICState, nc, nc), opaque);
 349         }
 350     }
 351
 352     QTAILQ_FOREACH(vlan, &vlans, next) {
 353         QTAILQ_FOREACH(nc, &vlan->clients, next) {
 354             if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 355                 func(DO_UPCAST(NICState, nc, nc), opaque);
 356             }
 357         }
 358     }
 359 }
 360
 361 int qemu_can_send_packet(VLANClientState *sender)
 362 {
 363     VLANState *vlan = sender->vlan;
 364     VLANClientState *vc;
 365
 366     if (sender->peer) {
 367         if (sender->peer->receive_disabled) {
 368             return 0;
 369         } else if (sender->peer->info->can_receive &&
 370                    !sender->peer->info->can_receive(sender->peer)) {
 371             return 0;
 372         } else {
 373             return 1;
 374         }
 375     }
 376
 377     if (!sender->vlan) {
 378         return 1;
 379     }
 380
 381     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 382         if (vc == sender) {
 383             continue;
 384         }
 385
 386         /* no can_receive() handler, they can always receive */
 387         if (vc->info->can_receive && !vc->info->can_receive(vc)) {
 388             return 0;
 389         }
 390     }
 391     return 1;
 392 }
 393
 394 static ssize_t qemu_deliver_packet(VLANClientState *sender,
 395                                    unsigned flags,
 396                                    const uint8_t *data,
 397                                    size_t size,
 398                                    void *opaque)
 399 {
 400     VLANClientState *vc = opaque;
 401     ssize_t ret;
 402
 403     if (vc->link_down) {
 404         return size;
 405     }
 406
 407     if (vc->receive_disabled) {
 408         return 0;
 409     }
 410
 411     if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
 412         ret = vc->info->receive_raw(vc, data, size);
 413     } else {
 414         ret = vc->info->receive(vc, data, size);
 415     }
 416
 417     if (ret == 0) {
 418         vc->receive_disabled = 1;
 419     };
 420
 421     return ret;
 422 }
 423
 424 static ssize_t qemu_vlan_deliver_packet(VLANClientState *sender,
 425                                         unsigned flags,
 426                                         const uint8_t *buf,
 427                                         size_t size,
 428                                         void *opaque)
 429 {
 430     VLANState *vlan = opaque;
 431     VLANClientState *vc;
 432     ssize_t ret = -1;
 433
 434     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 435         ssize_t len;
 436
 437         if (vc == sender) {
 438             continue;
 439         }
 440
 441         if (vc->link_down) {
 442             ret = size;
 443             continue;
 444         }
 445
 446         if (vc->receive_disabled) {
 447             ret = 0;
 448             continue;
 449         }
 450
 451         if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
 452             len = vc->info->receive_raw(vc, buf, size);
 453         } else {
 454             len = vc->info->receive(vc, buf, size);
 455         }
 456
 457         if (len == 0) {
 458             vc->receive_disabled = 1;
 459         }
 460
 461         ret = (ret >= 0) ? ret : len;
 462
 463     }
 464
 465     return ret;
 466 }
 467
 468 void qemu_purge_queued_packets(VLANClientState *vc)
 469 {
 470     NetQueue *queue;
 471
 472     if (!vc->peer && !vc->vlan) {
 473         return;
 474     }
 475
 476     if (vc->peer) {
 477         queue = vc->peer->send_queue;
 478     } else {
 479         queue = vc->vlan->send_queue;
 480     }
 481
 482     qemu_net_queue_purge(queue, vc);
 483 }
 484
 485 void qemu_flush_queued_packets(VLANClientState *vc)
 486 {
 487     NetQueue *queue;
 488
 489     vc->receive_disabled = 0;
 490
 491     if (vc->vlan) {
 492         queue = vc->vlan->send_queue;
 493     } else {
 494         queue = vc->send_queue;
 495     }
 496
 497     qemu_net_queue_flush(queue);
 498 }
 499
 500 static ssize_t qemu_send_packet_async_with_flags(VLANClientState *sender,
 501                                                  unsigned flags,
 502                                                  const uint8_t *buf, int size,
 503                                                  NetPacketSent *sent_cb)
 504 {
 505     NetQueue *queue;
 506
 507 #ifdef DEBUG_NET
 508     printf("qemu_send_packet_async:\n");
 509     hex_dump(stdout, buf, size);
 510 #endif
 511
 512     if (sender->link_down || (!sender->peer && !sender->vlan)) {
 513         return size;
 514     }
 515
 516     if (sender->peer) {
 517         queue = sender->peer->send_queue;
 518     } else {
 519         queue = sender->vlan->send_queue;
 520     }
 521
 522     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 523 }
 524
 525 ssize_t qemu_send_packet_async(VLANClientState *sender,
 526                                const uint8_t *buf, int size,
 527                                NetPacketSent *sent_cb)
 528 {
 529     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 530                                              buf, size, sent_cb);
 531 }
 532
 533 void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
 534 {
 535     qemu_send_packet_async(vc, buf, size, NULL);
 536 }
 537
 538 ssize_t qemu_send_packet_raw(VLANClientState *vc, const uint8_t *buf, int size)
 539 {
 540     return qemu_send_packet_async_with_flags(vc, QEMU_NET_PACKET_FLAG_RAW,
 541                                              buf, size, NULL);
 542 }
 543
 544 static ssize_t vc_sendv_compat(VLANClientState *vc, const struct iovec *iov,
 545                                int iovcnt)
 546 {
 547     uint8_t buffer[4096];
 548     size_t offset;
 549
 550     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 551
 552     return vc->info->receive(vc, buffer, offset);
 553 }
 554
 555 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
 556                                        unsigned flags,
 557                                        const struct iovec *iov,
 558                                        int iovcnt,
 559                                        void *opaque)
 560 {
 561     VLANClientState *vc = opaque;
 562
 563     if (vc->link_down) {
 564         return iov_size(iov, iovcnt);
 565     }
 566
 567     if (vc->info->receive_iov) {
 568         return vc->info->receive_iov(vc, iov, iovcnt);
 569     } else {
 570         return vc_sendv_compat(vc, iov, iovcnt);
 571     }
 572 }
 573
 574 static ssize_t qemu_vlan_deliver_packet_iov(VLANClientState *sender,
 575                                             unsigned flags,
 576                                             const struct iovec *iov,
 577                                             int iovcnt,
 578                                             void *opaque)
 579 {
 580     VLANState *vlan = opaque;
 581     VLANClientState *vc;
 582     ssize_t ret = -1;
 583
 584     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 585         ssize_t len;
 586
 587         if (vc == sender) {
 588             continue;
 589         }
 590
 591         if (vc->link_down) {
 592             ret = iov_size(iov, iovcnt);
 593             continue;
 594         }
 595
 596         assert(!(flags & QEMU_NET_PACKET_FLAG_RAW));
 597
 598         if (vc->info->receive_iov) {
 599             len = vc->info->receive_iov(vc, iov, iovcnt);
 600         } else {
 601             len = vc_sendv_compat(vc, iov, iovcnt);
 602         }
 603
 604         ret = (ret >= 0) ? ret : len;
 605     }
 606
 607     return ret;
 608 }
 609
 610 ssize_t qemu_sendv_packet_async(VLANClientState *sender,
 611                                 const struct iovec *iov, int iovcnt,
 612                                 NetPacketSent *sent_cb)
 613 {
 614     NetQueue *queue;
 615
 616     if (sender->link_down || (!sender->peer && !sender->vlan)) {
 617         return iov_size(iov, iovcnt);
 618     }
 619
 620     if (sender->peer) {
 621         queue = sender->peer->send_queue;
 622     } else {
 623         queue = sender->vlan->send_queue;
 624     }
 625
 626     return qemu_net_queue_send_iov(queue, sender,
 627                                    QEMU_NET_PACKET_FLAG_NONE,
 628                                    iov, iovcnt, sent_cb);
 629 }
 630
 631 ssize_t
 632 qemu_sendv_packet(VLANClientState *vc, const struct iovec *iov, int iovcnt)
 633 {
 634     return qemu_sendv_packet_async(vc, iov, iovcnt, NULL);
 635 }
 636
 637 /* find or alloc a new VLAN */
 638 VLANState *qemu_find_vlan(int id, int allocate)
 639 {
 640     VLANState *vlan;
 641
 642     QTAILQ_FOREACH(vlan, &vlans, next) {
 643         if (vlan->id == id) {
 644             return vlan;
 645         }
 646     }
 647
 648     if (!allocate) {
 649         return NULL;
 650     }
 651
 652     vlan = g_malloc0(sizeof(VLANState));
 653     vlan->id = id;
 654     QTAILQ_INIT(&vlan->clients);
 655
 656     vlan->send_queue = qemu_new_net_queue(qemu_vlan_deliver_packet,
 657                                           qemu_vlan_deliver_packet_iov,
 658                                           vlan);
 659
 660     QTAILQ_INSERT_TAIL(&vlans, vlan, next);
 661
 662     return vlan;
 663 }
 664
 665 VLANClientState *qemu_find_netdev(const char *id)
 666 {
 667     VLANClientState *vc;
 668
 669     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
 670         if (vc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 671             continue;
 672         if (!strcmp(vc->name, id)) {
 673             return vc;
 674         }
 675     }
 676
 677     return NULL;
 678 }
 679
 680 static int nic_get_free_idx(void)
 681 {
 682     int index;
 683
 684     for (index = 0; index < MAX_NICS; index++)
 685         if (!nd_table[index].used)
 686             return index;
 687     return -1;
 688 }
 689
 690 int qemu_show_nic_models(const char *arg, const char *const *models)
 691 {
 692     int i;
 693
 694     if (!arg || strcmp(arg, "?"))
 695         return 0;
 696
 697     fprintf(stderr, "qemu: Supported NIC models: ");
 698     for (i = 0 ; models[i]; i++)
 699         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 700     return 1;
 701 }
 702
 703 void qemu_check_nic_model(NICInfo *nd, const char *model)
 704 {
 705     const char *models[2];
 706
 707     models[0] = model;
 708     models[1] = NULL;
 709
 710     if (qemu_show_nic_models(nd->model, models))
 711         exit(0);
 712     if (qemu_find_nic_model(nd, models, model) < 0)
 713         exit(1);
 714 }
 715
 716 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 717                         const char *default_model)
 718 {
 719     int i;
 720
 721     if (!nd->model)
 722         nd->model = g_strdup(default_model);
 723
 724     for (i = 0 ; models[i]; i++) {
 725         if (strcmp(nd->model, models[i]) == 0)
 726             return i;
 727     }
 728
 729     error_report("Unsupported NIC model: %s", nd->model);
 730     return -1;
 731 }
 732
 733 int net_handle_fd_param(Monitor *mon, const char *param)
 734 {
 735     int fd;
 736
 737     if (!qemu_isdigit(param[0]) && mon) {
 738
 739         fd = monitor_get_fd(mon, param);
 740         if (fd == -1) {
 741             error_report("No file descriptor named %s found", param);
 742             return -1;
 743         }
 744     } else {
 745         fd = qemu_parse_fd(param);
 746     }
 747
 748     return fd;
 749 }
 750
 751 static int net_init_nic(const NetClientOptions *opts, const char *name,
 752                         VLANState *vlan)
 753 {
 754     int idx;
 755     NICInfo *nd;
 756     const NetLegacyNicOptions *nic;
 757
 758     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 759     nic = opts->nic;
 760
 761     idx = nic_get_free_idx();
 762     if (idx == -1 || nb_nics >= MAX_NICS) {
 763         error_report("Too Many NICs");
 764         return -1;
 765     }
 766
 767     nd = &nd_table[idx];
 768
 769     memset(nd, 0, sizeof(*nd));
 770
 771     if (nic->has_netdev) {
 772         nd->netdev = qemu_find_netdev(nic->netdev);
 773         if (!nd->netdev) {
 774             error_report("netdev '%s' not found", nic->netdev);
 775             return -1;
 776         }
 777     } else {
 778         assert(vlan);
 779         nd->vlan = vlan;
 780     }
 781     if (name) {
 782         nd->name = g_strdup(name);
 783     }
 784     if (nic->has_model) {
 785         nd->model = g_strdup(nic->model);
 786     }
 787     if (nic->has_addr) {
 788         nd->devaddr = g_strdup(nic->addr);
 789     }
 790
 791     if (nic->has_macaddr &&
 792         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 793         error_report("invalid syntax for ethernet address");
 794         return -1;
 795     }
 796     qemu_macaddr_default_if_unset(&nd->macaddr);
 797
 798     if (nic->has_vectors) {
 799         if (nic->vectors > 0x7ffffff) {
 800             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 801             return -1;
 802         }
 803         nd->nvectors = nic->vectors;
 804     } else {
 805         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 806     }
 807
 808     nd->used = 1;
 809     nb_nics++;
 810
 811     return idx;
 812 }
 813
 814
 815 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 816     const NetClientOptions *opts,
 817     const char *name,
 818     VLANState *vlan) = {
 819         [NET_CLIENT_OPTIONS_KIND_NIC]    = net_init_nic,
 820 #ifdef CONFIG_SLIRP
 821         [NET_CLIENT_OPTIONS_KIND_USER]   = net_init_slirp,
 822 #endif
 823         [NET_CLIENT_OPTIONS_KIND_TAP]    = net_init_tap,
 824         [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket,
 825 #ifdef CONFIG_VDE
 826         [NET_CLIENT_OPTIONS_KIND_VDE]    = net_init_vde,
 827 #endif
 828         [NET_CLIENT_OPTIONS_KIND_DUMP]   = net_init_dump,
 829 #ifdef CONFIG_NET_BRIDGE
 830         [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge,
 831 #endif
 832 };
 833
 834
 835 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 836 {
 837     union {
 838         const Netdev    *netdev;
 839         const NetLegacy *net;
 840     } u;
 841     const NetClientOptions *opts;
 842     const char *name;
 843
 844     if (is_netdev) {
 845         u.netdev = object;
 846         opts = u.netdev->opts;
 847         name = u.netdev->id;
 848
 849         switch (opts->kind) {
 850 #ifdef CONFIG_SLIRP
 851         case NET_CLIENT_OPTIONS_KIND_USER:
 852 #endif
 853         case NET_CLIENT_OPTIONS_KIND_TAP:
 854         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 855 #ifdef CONFIG_VDE
 856         case NET_CLIENT_OPTIONS_KIND_VDE:
 857 #endif
 858 #ifdef CONFIG_NET_BRIDGE
 859         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 860 #endif
 861             break;
 862
 863         default:
 864             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 865                       "a netdev backend type");
 866             return -1;
 867         }
 868     } else {
 869         u.net = object;
 870         opts = u.net->opts;
 871         /* missing optional values have been initialized to "all bits zero" */
 872         name = u.net->has_id ? u.net->id : u.net->name;
 873     }
 874
 875     if (net_client_init_fun[opts->kind]) {
 876         VLANState *vlan = NULL;
 877
 878         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 879          * parameter. */
 880         if (!is_netdev &&
 881             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 882              !opts->nic->has_netdev)) {
 883             vlan = qemu_find_vlan(u.net->has_vlan ? u.net->vlan : 0, true);
 884         }
 885
 886         if (net_client_init_fun[opts->kind](opts, name, vlan) < 0) {
 887             /* TODO push error reporting into init() methods */
 888             error_set(errp, QERR_DEVICE_INIT_FAILED,
 889                       NetClientOptionsKind_lookup[opts->kind]);
 890             return -1;
 891         }
 892     }
 893     return 0;
 894 }
 895
 896
 897 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 898 {
 899     if (is_netdev) {
 900         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 901     } else {
 902         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 903     }
 904 }
 905
 906
 907 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 908 {
 909     void *object = NULL;
 910     Error *err = NULL;
 911     int ret = -1;
 912
 913     {
 914         OptsVisitor *ov = opts_visitor_new(opts);
 915
 916         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 917         opts_visitor_cleanup(ov);
 918     }
 919
 920     if (!err) {
 921         ret = net_client_init1(object, is_netdev, &err);
 922     }
 923
 924     if (object) {
 925         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 926
 927         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 928         qapi_dealloc_visitor_cleanup(dv);
 929     }
 930
 931     error_propagate(errp, err);
 932     return ret;
 933 }
 934
 935
 936 static int net_host_check_device(const char *device)
 937 {
 938     int i;
 939     const char *valid_param_list[] = { "tap", "socket", "dump"
 940 #ifdef CONFIG_NET_BRIDGE
 941                                        , "bridge"
 942 #endif
 943 #ifdef CONFIG_SLIRP
 944                                        ,"user"
 945 #endif
 946 #ifdef CONFIG_VDE
 947                                        ,"vde"
 948 #endif
 949     };
 950     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
 951         if (!strncmp(valid_param_list[i], device,
 952                      strlen(valid_param_list[i])))
 953             return 1;
 954     }
 955
 956     return 0;
 957 }
 958
 959 void net_host_device_add(Monitor *mon, const QDict *qdict)
 960 {
 961     const char *device = qdict_get_str(qdict, "device");
 962     const char *opts_str = qdict_get_try_str(qdict, "opts");
 963     Error *local_err = NULL;
 964     QemuOpts *opts;
 965
 966     if (!net_host_check_device(device)) {
 967         monitor_printf(mon, "invalid host network device %s\n", device);
 968         return;
 969     }
 970
 971     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 972     if (!opts) {
 973         return;
 974     }
 975
 976     qemu_opt_set(opts, "type", device);
 977
 978     net_client_init(opts, 0, &local_err);
 979     if (error_is_set(&local_err)) {
 980         qerror_report_err(local_err);
 981         error_free(local_err);
 982         monitor_printf(mon, "adding host network device %s failed\n", device);
 983     }
 984 }
 985
 986 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 987 {
 988     VLANClientState *vc;
 989     int vlan_id = qdict_get_int(qdict, "vlan_id");
 990     const char *device = qdict_get_str(qdict, "device");
 991
 992     vc = qemu_find_vlan_client_by_name(mon, vlan_id, device);
 993     if (!vc) {
 994         return;
 995     }
 996     if (!net_host_check_device(vc->model)) {
 997         monitor_printf(mon, "invalid host network device %s\n", device);
 998         return;
 999     }
1000     qemu_del_vlan_client(vc);
1001 }
1002
1003 void netdev_add(QemuOpts *opts, Error **errp)
1004 {
1005     net_client_init(opts, 1, errp);
1006 }
1007
1008 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
1009 {
1010     Error *local_err = NULL;
1011     QemuOptsList *opts_list;
1012     QemuOpts *opts;
1013
1014     opts_list = qemu_find_opts_err("netdev", &local_err);
1015     if (error_is_set(&local_err)) {
1016         goto exit_err;
1017     }
1018
1019     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1020     if (error_is_set(&local_err)) {
1021         goto exit_err;
1022     }
1023
1024     netdev_add(opts, &local_err);
1025     if (error_is_set(&local_err)) {
1026         qemu_opts_del(opts);
1027         goto exit_err;
1028     }
1029
1030     return 0;
1031
1032 exit_err:
1033     qerror_report_err(local_err);
1034     error_free(local_err);
1035     return -1;
1036 }
1037
1038 void qmp_netdev_del(const char *id, Error **errp)
1039 {
1040     VLANClientState *vc;
1041
1042     vc = qemu_find_netdev(id);
1043     if (!vc) {
1044         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
1045         return;
1046     }
1047
1048     qemu_del_vlan_client(vc);
1049     qemu_opts_del(qemu_opts_find(qemu_find_opts_err("netdev", errp), id));
1050 }
1051
1052 static void print_net_client(Monitor *mon, VLANClientState *vc)
1053 {
1054     monitor_printf(mon, "%s: type=%s,%s\n", vc->name,
1055                    NetClientOptionsKind_lookup[vc->info->type], vc->info_str);
1056 }
1057
1058 void do_info_network(Monitor *mon)
1059 {
1060     VLANState *vlan;
1061     VLANClientState *vc, *peer;
1062     NetClientOptionsKind type;
1063
1064     QTAILQ_FOREACH(vlan, &vlans, next) {
1065         monitor_printf(mon, "VLAN %d devices:\n", vlan->id);
1066
1067         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1068             monitor_printf(mon, "  ");
1069             print_net_client(mon, vc);
1070         }
1071     }
1072     monitor_printf(mon, "Devices not on any VLAN:\n");
1073     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1074         peer = vc->peer;
1075         type = vc->info->type;
1076         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1077             monitor_printf(mon, "  ");
1078             print_net_client(mon, vc);
1079         } /* else it's a netdev connected to a NIC, printed with the NIC */
1080         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1081             monitor_printf(mon, "   \\ ");
1082             print_net_client(mon, peer);
1083         }
1084     }
1085 }
1086
1087 void qmp_set_link(const char *name, bool up, Error **errp)
1088 {
1089     VLANState *vlan;
1090     VLANClientState *vc = NULL;
1091
1092     QTAILQ_FOREACH(vlan, &vlans, next) {
1093         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1094             if (strcmp(vc->name, name) == 0) {
1095                 goto done;
1096             }
1097         }
1098     }
1099     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1100         if (!strcmp(vc->name, name)) {
1101             goto done;
1102         }
1103     }
1104 done:
1105
1106     if (!vc) {
1107         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
1108         return;
1109     }
1110
1111     vc->link_down = !up;
1112
1113     if (vc->info->link_status_changed) {
1114         vc->info->link_status_changed(vc);
1115     }
1116
1117     /* Notify peer. Don't update peer link status: this makes it possible to
1118      * disconnect from host network without notifying the guest.
1119      * FIXME: is disconnected link status change operation useful?
1120      *
1121      * Current behaviour is compatible with qemu vlans where there could be
1122      * multiple clients that can still communicate with each other in
1123      * disconnected mode. For now maintain this compatibility. */
1124     if (vc->peer && vc->peer->info->link_status_changed) {
1125         vc->peer->info->link_status_changed(vc->peer);
1126     }
1127 }
1128
1129 void net_cleanup(void)
1130 {
1131     VLANState *vlan;
1132     VLANClientState *vc, *next_vc;
1133
1134     QTAILQ_FOREACH(vlan, &vlans, next) {
1135         QTAILQ_FOREACH_SAFE(vc, &vlan->clients, next, next_vc) {
1136             qemu_del_vlan_client(vc);
1137         }
1138     }
1139
1140     QTAILQ_FOREACH_SAFE(vc, &non_vlan_clients, next, next_vc) {
1141         qemu_del_vlan_client(vc);
1142     }
1143 }
1144
1145 void net_check_clients(void)
1146 {
1147     VLANState *vlan;
1148     VLANClientState *vc;
1149     int i;
1150
1151     /* Don't warn about the default network setup that you get if
1152      * no command line -net or -netdev options are specified. There
1153      * are two cases that we would otherwise complain about:
1154      * (1) board doesn't support a NIC but the implicit "-net nic"
1155      * requested one
1156      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1157      * sets up a nic that isn't connected to anything.
1158      */
1159     if (default_net) {
1160         return;
1161     }
1162
1163     QTAILQ_FOREACH(vlan, &vlans, next) {
1164         int has_nic = 0, has_host_dev = 0;
1165
1166         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1167             switch (vc->info->type) {
1168             case NET_CLIENT_OPTIONS_KIND_NIC:
1169                 has_nic = 1;
1170                 break;
1171             case NET_CLIENT_OPTIONS_KIND_USER:
1172             case NET_CLIENT_OPTIONS_KIND_TAP:
1173             case NET_CLIENT_OPTIONS_KIND_SOCKET:
1174             case NET_CLIENT_OPTIONS_KIND_VDE:
1175                 has_host_dev = 1;
1176                 break;
1177             default: ;
1178             }
1179         }
1180         if (has_host_dev && !has_nic)
1181             fprintf(stderr, "Warning: vlan %d with no nics\n", vlan->id);
1182         if (has_nic && !has_host_dev)
1183             fprintf(stderr,
1184                     "Warning: vlan %d is not connected to host network\n",
1185                     vlan->id);
1186     }
1187     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1188         if (!vc->peer) {
1189             fprintf(stderr, "Warning: %s %s has no peer\n",
1190                     vc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ? "nic" : "netdev",
1191                     vc->name);
1192         }
1193     }
1194
1195     /* Check that all NICs requested via -net nic actually got created.
1196      * NICs created via -device don't need to be checked here because
1197      * they are always instantiated.
1198      */
1199     for (i = 0; i < MAX_NICS; i++) {
1200         NICInfo *nd = &nd_table[i];
1201         if (nd->used && !nd->instantiated) {
1202             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1203                     "was not created (not supported by this machine?)\n",
1204                     nd->name ? nd->name : "anonymous",
1205                     nd->model ? nd->model : "unspecified");
1206         }
1207     }
1208 }
1209
1210 static int net_init_client(QemuOpts *opts, void *dummy)
1211 {
1212     Error *local_err = NULL;
1213
1214     net_client_init(opts, 0, &local_err);
1215     if (error_is_set(&local_err)) {
1216         qerror_report_err(local_err);
1217         error_free(local_err);
1218         return -1;
1219     }
1220
1221     return 0;
1222 }
1223
1224 static int net_init_netdev(QemuOpts *opts, void *dummy)
1225 {
1226     Error *local_err = NULL;
1227     int ret;
1228
1229     ret = net_client_init(opts, 1, &local_err);
1230     if (error_is_set(&local_err)) {
1231         qerror_report_err(local_err);
1232         error_free(local_err);
1233         return -1;
1234     }
1235
1236     return ret;
1237 }
1238
1239 int net_init_clients(void)
1240 {
1241     QemuOptsList *net = qemu_find_opts("net");
1242
1243     if (default_net) {
1244         /* if no clients, we use a default config */
1245         qemu_opts_set(net, NULL, "type", "nic");
1246 #ifdef CONFIG_SLIRP
1247         qemu_opts_set(net, NULL, "type", "user");
1248 #endif
1249     }
1250
1251     QTAILQ_INIT(&vlans);
1252     QTAILQ_INIT(&non_vlan_clients);
1253
1254     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1255         return -1;
1256
1257     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1258         return -1;
1259     }
1260
1261     return 0;
1262 }
1263
1264 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1265 {
1266 #if defined(CONFIG_SLIRP)
1267     int ret;
1268     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1269         return ret;
1270     }
1271 #endif
1272
1273     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1274         return -1;
1275     }
1276
1277     default_net = 0;
1278     return 0;
1279 }
1280
1281 /* From FreeBSD */
1282 /* XXX: optimize */
1283 unsigned compute_mcast_idx(const uint8_t *ep)
1284 {
1285     uint32_t crc;
1286     int carry, i, j;
1287     uint8_t b;
1288
1289     crc = 0xffffffff;
1290     for (i = 0; i < 6; i++) {
1291         b = *ep++;
1292         for (j = 0; j < 8; j++) {
1293             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1294             crc <<= 1;
1295             b >>= 1;
1296             if (carry) {
1297                 crc = ((crc ^ POLYNOMIAL) | carry);
1298             }
1299         }
1300     }
1301     return crc >> 26;
1302 }