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(QemuOpts *old_opts, const NetClientOptions *opts,
 752                         const char *name, 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     QemuOpts *old_opts,
 817     const NetClientOptions *new_opts,
 818     const char *name,
 819     VLANState *vlan) = {
 820         [NET_CLIENT_OPTIONS_KIND_NIC]    = net_init_nic,
 821 #ifdef CONFIG_SLIRP
 822         [NET_CLIENT_OPTIONS_KIND_USER]   = net_init_slirp,
 823 #endif
 824         [NET_CLIENT_OPTIONS_KIND_TAP]    = net_init_tap,
 825         [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket,
 826 #ifdef CONFIG_VDE
 827         [NET_CLIENT_OPTIONS_KIND_VDE]    = net_init_vde,
 828 #endif
 829         [NET_CLIENT_OPTIONS_KIND_DUMP]   = net_init_dump,
 830 #ifdef CONFIG_NET_BRIDGE
 831         [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge,
 832 #endif
 833 };
 834
 835
 836 static int net_client_init1(const void *object, int is_netdev,
 837                             QemuOpts *old_opts, Error **errp)
 838 {
 839     union {
 840         const Netdev    *netdev;
 841         const NetLegacy *net;
 842     } u;
 843     const NetClientOptions *opts;
 844     const char *name;
 845
 846     if (is_netdev) {
 847         u.netdev = object;
 848         opts = u.netdev->opts;
 849         name = u.netdev->id;
 850
 851         switch (opts->kind) {
 852 #ifdef CONFIG_SLIRP
 853         case NET_CLIENT_OPTIONS_KIND_USER:
 854 #endif
 855         case NET_CLIENT_OPTIONS_KIND_TAP:
 856         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 857 #ifdef CONFIG_VDE
 858         case NET_CLIENT_OPTIONS_KIND_VDE:
 859 #endif
 860 #ifdef CONFIG_NET_BRIDGE
 861         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 862 #endif
 863             break;
 864
 865         default:
 866             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 867                       "a netdev backend type");
 868             return -1;
 869         }
 870     } else {
 871         u.net = object;
 872         opts = u.net->opts;
 873         /* missing optional values have been initialized to "all bits zero" */
 874         name = u.net->has_id ? u.net->id : u.net->name;
 875     }
 876
 877     if (net_client_init_fun[opts->kind]) {
 878         VLANState *vlan = NULL;
 879
 880         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 881          * parameter. */
 882         if (!is_netdev &&
 883             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 884              !opts->nic->has_netdev)) {
 885             vlan = qemu_find_vlan(u.net->has_vlan ? u.net->vlan : 0, true);
 886         }
 887
 888         if (net_client_init_fun[opts->kind](old_opts, opts, name, vlan) < 0) {
 889             /* TODO push error reporting into init() methods */
 890             error_set(errp, QERR_DEVICE_INIT_FAILED,
 891                       NetClientOptionsKind_lookup[opts->kind]);
 892             return -1;
 893         }
 894     }
 895     return 0;
 896 }
 897
 898
 899 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 900 {
 901     if (is_netdev) {
 902         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 903     } else {
 904         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 905     }
 906 }
 907
 908
 909 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 910 {
 911     void *object = NULL;
 912     Error *err = NULL;
 913     int ret = -1;
 914
 915     {
 916         OptsVisitor *ov = opts_visitor_new(opts);
 917
 918         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 919         opts_visitor_cleanup(ov);
 920     }
 921
 922     if (!err) {
 923         ret = net_client_init1(object, is_netdev, opts, &err);
 924     }
 925
 926     if (object) {
 927         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 928
 929         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 930         qapi_dealloc_visitor_cleanup(dv);
 931     }
 932
 933     error_propagate(errp, err);
 934     return ret;
 935 }
 936
 937
 938 static int net_host_check_device(const char *device)
 939 {
 940     int i;
 941     const char *valid_param_list[] = { "tap", "socket", "dump"
 942 #ifdef CONFIG_NET_BRIDGE
 943                                        , "bridge"
 944 #endif
 945 #ifdef CONFIG_SLIRP
 946                                        ,"user"
 947 #endif
 948 #ifdef CONFIG_VDE
 949                                        ,"vde"
 950 #endif
 951     };
 952     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
 953         if (!strncmp(valid_param_list[i], device,
 954                      strlen(valid_param_list[i])))
 955             return 1;
 956     }
 957
 958     return 0;
 959 }
 960
 961 void net_host_device_add(Monitor *mon, const QDict *qdict)
 962 {
 963     const char *device = qdict_get_str(qdict, "device");
 964     const char *opts_str = qdict_get_try_str(qdict, "opts");
 965     Error *local_err = NULL;
 966     QemuOpts *opts;
 967
 968     if (!net_host_check_device(device)) {
 969         monitor_printf(mon, "invalid host network device %s\n", device);
 970         return;
 971     }
 972
 973     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 974     if (!opts) {
 975         return;
 976     }
 977
 978     qemu_opt_set(opts, "type", device);
 979
 980     net_client_init(opts, 0, &local_err);
 981     if (error_is_set(&local_err)) {
 982         qerror_report_err(local_err);
 983         error_free(local_err);
 984         monitor_printf(mon, "adding host network device %s failed\n", device);
 985     }
 986 }
 987
 988 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 989 {
 990     VLANClientState *vc;
 991     int vlan_id = qdict_get_int(qdict, "vlan_id");
 992     const char *device = qdict_get_str(qdict, "device");
 993
 994     vc = qemu_find_vlan_client_by_name(mon, vlan_id, device);
 995     if (!vc) {
 996         return;
 997     }
 998     if (!net_host_check_device(vc->model)) {
 999         monitor_printf(mon, "invalid host network device %s\n", device);
1000         return;
1001     }
1002     qemu_del_vlan_client(vc);
1003 }
1004
1005 void netdev_add(QemuOpts *opts, Error **errp)
1006 {
1007     net_client_init(opts, 1, errp);
1008 }
1009
1010 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
1011 {
1012     Error *local_err = NULL;
1013     QemuOptsList *opts_list;
1014     QemuOpts *opts;
1015
1016     opts_list = qemu_find_opts_err("netdev", &local_err);
1017     if (error_is_set(&local_err)) {
1018         goto exit_err;
1019     }
1020
1021     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1022     if (error_is_set(&local_err)) {
1023         goto exit_err;
1024     }
1025
1026     netdev_add(opts, &local_err);
1027     if (error_is_set(&local_err)) {
1028         qemu_opts_del(opts);
1029         goto exit_err;
1030     }
1031
1032     return 0;
1033
1034 exit_err:
1035     qerror_report_err(local_err);
1036     error_free(local_err);
1037     return -1;
1038 }
1039
1040 void qmp_netdev_del(const char *id, Error **errp)
1041 {
1042     VLANClientState *vc;
1043
1044     vc = qemu_find_netdev(id);
1045     if (!vc) {
1046         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
1047         return;
1048     }
1049
1050     qemu_del_vlan_client(vc);
1051     qemu_opts_del(qemu_opts_find(qemu_find_opts_err("netdev", errp), id));
1052 }
1053
1054 static void print_net_client(Monitor *mon, VLANClientState *vc)
1055 {
1056     monitor_printf(mon, "%s: type=%s,%s\n", vc->name,
1057                    NetClientOptionsKind_lookup[vc->info->type], vc->info_str);
1058 }
1059
1060 void do_info_network(Monitor *mon)
1061 {
1062     VLANState *vlan;
1063     VLANClientState *vc, *peer;
1064     NetClientOptionsKind type;
1065
1066     QTAILQ_FOREACH(vlan, &vlans, next) {
1067         monitor_printf(mon, "VLAN %d devices:\n", vlan->id);
1068
1069         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1070             monitor_printf(mon, "  ");
1071             print_net_client(mon, vc);
1072         }
1073     }
1074     monitor_printf(mon, "Devices not on any VLAN:\n");
1075     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1076         peer = vc->peer;
1077         type = vc->info->type;
1078         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1079             monitor_printf(mon, "  ");
1080             print_net_client(mon, vc);
1081         } /* else it's a netdev connected to a NIC, printed with the NIC */
1082         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1083             monitor_printf(mon, "   \\ ");
1084             print_net_client(mon, peer);
1085         }
1086     }
1087 }
1088
1089 void qmp_set_link(const char *name, bool up, Error **errp)
1090 {
1091     VLANState *vlan;
1092     VLANClientState *vc = NULL;
1093
1094     QTAILQ_FOREACH(vlan, &vlans, next) {
1095         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1096             if (strcmp(vc->name, name) == 0) {
1097                 goto done;
1098             }
1099         }
1100     }
1101     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1102         if (!strcmp(vc->name, name)) {
1103             goto done;
1104         }
1105     }
1106 done:
1107
1108     if (!vc) {
1109         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
1110         return;
1111     }
1112
1113     vc->link_down = !up;
1114
1115     if (vc->info->link_status_changed) {
1116         vc->info->link_status_changed(vc);
1117     }
1118
1119     /* Notify peer. Don't update peer link status: this makes it possible to
1120      * disconnect from host network without notifying the guest.
1121      * FIXME: is disconnected link status change operation useful?
1122      *
1123      * Current behaviour is compatible with qemu vlans where there could be
1124      * multiple clients that can still communicate with each other in
1125      * disconnected mode. For now maintain this compatibility. */
1126     if (vc->peer && vc->peer->info->link_status_changed) {
1127         vc->peer->info->link_status_changed(vc->peer);
1128     }
1129 }
1130
1131 void net_cleanup(void)
1132 {
1133     VLANState *vlan;
1134     VLANClientState *vc, *next_vc;
1135
1136     QTAILQ_FOREACH(vlan, &vlans, next) {
1137         QTAILQ_FOREACH_SAFE(vc, &vlan->clients, next, next_vc) {
1138             qemu_del_vlan_client(vc);
1139         }
1140     }
1141
1142     QTAILQ_FOREACH_SAFE(vc, &non_vlan_clients, next, next_vc) {
1143         qemu_del_vlan_client(vc);
1144     }
1145 }
1146
1147 void net_check_clients(void)
1148 {
1149     VLANState *vlan;
1150     VLANClientState *vc;
1151     int i;
1152
1153     /* Don't warn about the default network setup that you get if
1154      * no command line -net or -netdev options are specified. There
1155      * are two cases that we would otherwise complain about:
1156      * (1) board doesn't support a NIC but the implicit "-net nic"
1157      * requested one
1158      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1159      * sets up a nic that isn't connected to anything.
1160      */
1161     if (default_net) {
1162         return;
1163     }
1164
1165     QTAILQ_FOREACH(vlan, &vlans, next) {
1166         int has_nic = 0, has_host_dev = 0;
1167
1168         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1169             switch (vc->info->type) {
1170             case NET_CLIENT_OPTIONS_KIND_NIC:
1171                 has_nic = 1;
1172                 break;
1173             case NET_CLIENT_OPTIONS_KIND_USER:
1174             case NET_CLIENT_OPTIONS_KIND_TAP:
1175             case NET_CLIENT_OPTIONS_KIND_SOCKET:
1176             case NET_CLIENT_OPTIONS_KIND_VDE:
1177                 has_host_dev = 1;
1178                 break;
1179             default: ;
1180             }
1181         }
1182         if (has_host_dev && !has_nic)
1183             fprintf(stderr, "Warning: vlan %d with no nics\n", vlan->id);
1184         if (has_nic && !has_host_dev)
1185             fprintf(stderr,
1186                     "Warning: vlan %d is not connected to host network\n",
1187                     vlan->id);
1188     }
1189     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1190         if (!vc->peer) {
1191             fprintf(stderr, "Warning: %s %s has no peer\n",
1192                     vc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ? "nic" : "netdev",
1193                     vc->name);
1194         }
1195     }
1196
1197     /* Check that all NICs requested via -net nic actually got created.
1198      * NICs created via -device don't need to be checked here because
1199      * they are always instantiated.
1200      */
1201     for (i = 0; i < MAX_NICS; i++) {
1202         NICInfo *nd = &nd_table[i];
1203         if (nd->used && !nd->instantiated) {
1204             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1205                     "was not created (not supported by this machine?)\n",
1206                     nd->name ? nd->name : "anonymous",
1207                     nd->model ? nd->model : "unspecified");
1208         }
1209     }
1210 }
1211
1212 static int net_init_client(QemuOpts *opts, void *dummy)
1213 {
1214     Error *local_err = NULL;
1215
1216     net_client_init(opts, 0, &local_err);
1217     if (error_is_set(&local_err)) {
1218         qerror_report_err(local_err);
1219         error_free(local_err);
1220         return -1;
1221     }
1222
1223     return 0;
1224 }
1225
1226 static int net_init_netdev(QemuOpts *opts, void *dummy)
1227 {
1228     Error *local_err = NULL;
1229     int ret;
1230
1231     ret = net_client_init(opts, 1, &local_err);
1232     if (error_is_set(&local_err)) {
1233         qerror_report_err(local_err);
1234         error_free(local_err);
1235         return -1;
1236     }
1237
1238     return ret;
1239 }
1240
1241 int net_init_clients(void)
1242 {
1243     QemuOptsList *net = qemu_find_opts("net");
1244
1245     if (default_net) {
1246         /* if no clients, we use a default config */
1247         qemu_opts_set(net, NULL, "type", "nic");
1248 #ifdef CONFIG_SLIRP
1249         qemu_opts_set(net, NULL, "type", "user");
1250 #endif
1251     }
1252
1253     QTAILQ_INIT(&vlans);
1254     QTAILQ_INIT(&non_vlan_clients);
1255
1256     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1257         return -1;
1258
1259     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1260         return -1;
1261     }
1262
1263     return 0;
1264 }
1265
1266 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1267 {
1268 #if defined(CONFIG_SLIRP)
1269     int ret;
1270     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1271         return ret;
1272     }
1273 #endif
1274
1275     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1276         return -1;
1277     }
1278
1279     default_net = 0;
1280     return 0;
1281 }
1282
1283 /* From FreeBSD */
1284 /* XXX: optimize */
1285 unsigned compute_mcast_idx(const uint8_t *ep)
1286 {
1287     uint32_t crc;
1288     int carry, i, j;
1289     uint8_t b;
1290
1291     crc = 0xffffffff;
1292     for (i = 0; i < 6; i++) {
1293         b = *ep++;
1294         for (j = 0; j < 8; j++) {
1295             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1296             crc <<= 1;
1297             b >>= 1;
1298             if (carry) {
1299                 crc = ((crc ^ POLYNOMIAL) | carry);
1300             }
1301         }
1302     }
1303     return crc >> 26;
1304 }