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 "hw/qdev.h"
  38 #include "iov.h"
  39
  40 static QTAILQ_HEAD(, VLANState) vlans;
  41 static QTAILQ_HEAD(, VLANClientState) non_vlan_clients;
  42
  43 int default_net = 1;
  44
  45 /***********************************************************/
  46 /* network device redirectors */
  47
  48 #if defined(DEBUG_NET)
  49 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  50 {
  51     int len, i, j, c;
  52
  53     for(i=0;i<size;i+=16) {
  54         len = size - i;
  55         if (len > 16)
  56             len = 16;
  57         fprintf(f, "%08x ", i);
  58         for(j=0;j<16;j++) {
  59             if (j < len)
  60                 fprintf(f, " %02x", buf[i+j]);
  61             else
  62                 fprintf(f, "   ");
  63         }
  64         fprintf(f, " ");
  65         for(j=0;j<len;j++) {
  66             c = buf[i+j];
  67             if (c < ' ' || c > '~')
  68                 c = '.';
  69             fprintf(f, "%c", c);
  70         }
  71         fprintf(f, "\n");
  72     }
  73 }
  74 #endif
  75
  76 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  77 {
  78     const char *p, *p1;
  79     int len;
  80     p = *pp;
  81     p1 = strchr(p, sep);
  82     if (!p1)
  83         return -1;
  84     len = p1 - p;
  85     p1++;
  86     if (buf_size > 0) {
  87         if (len > buf_size - 1)
  88             len = buf_size - 1;
  89         memcpy(buf, p, len);
  90         buf[len] = '\0';
  91     }
  92     *pp = p1;
  93     return 0;
  94 }
  95
  96 int parse_host_port(struct sockaddr_in *saddr, const char *str)
  97 {
  98     char buf[512];
  99     struct hostent *he;
 100     const char *p, *r;
 101     int port;
 102
 103     p = str;
 104     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 105         return -1;
 106     saddr->sin_family = AF_INET;
 107     if (buf[0] == '\0') {
 108         saddr->sin_addr.s_addr = 0;
 109     } else {
 110         if (qemu_isdigit(buf[0])) {
 111             if (!inet_aton(buf, &saddr->sin_addr))
 112                 return -1;
 113         } else {
 114             if ((he = gethostbyname(buf)) == NULL)
 115                 return - 1;
 116             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 117         }
 118     }
 119     port = strtol(p, (char **)&r, 0);
 120     if (r == p)
 121         return -1;
 122     saddr->sin_port = htons(port);
 123     return 0;
 124 }
 125
 126 void qemu_format_nic_info_str(VLANClientState *vc, uint8_t macaddr[6])
 127 {
 128     snprintf(vc->info_str, sizeof(vc->info_str),
 129              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 130              vc->model,
 131              macaddr[0], macaddr[1], macaddr[2],
 132              macaddr[3], macaddr[4], macaddr[5]);
 133 }
 134
 135 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 136 {
 137     static int index = 0;
 138     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 139
 140     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 141         return;
 142     macaddr->a[0] = 0x52;
 143     macaddr->a[1] = 0x54;
 144     macaddr->a[2] = 0x00;
 145     macaddr->a[3] = 0x12;
 146     macaddr->a[4] = 0x34;
 147     macaddr->a[5] = 0x56 + index++;
 148 }
 149
 150 static char *assign_name(VLANClientState *vc1, const char *model)
 151 {
 152     VLANState *vlan;
 153     VLANClientState *vc;
 154     char buf[256];
 155     int id = 0;
 156
 157     QTAILQ_FOREACH(vlan, &vlans, next) {
 158         QTAILQ_FOREACH(vc, &vlan->clients, next) {
 159             if (vc != vc1 && strcmp(vc->model, model) == 0) {
 160                 id++;
 161             }
 162         }
 163     }
 164
 165     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
 166         if (vc != vc1 && strcmp(vc->model, model) == 0) {
 167             id++;
 168         }
 169     }
 170
 171     snprintf(buf, sizeof(buf), "%s.%d", model, id);
 172
 173     return g_strdup(buf);
 174 }
 175
 176 static ssize_t qemu_deliver_packet(VLANClientState *sender,
 177                                    unsigned flags,
 178                                    const uint8_t *data,
 179                                    size_t size,
 180                                    void *opaque);
 181 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
 182                                        unsigned flags,
 183                                        const struct iovec *iov,
 184                                        int iovcnt,
 185                                        void *opaque);
 186
 187 VLANClientState *qemu_new_net_client(NetClientInfo *info,
 188                                      VLANState *vlan,
 189                                      VLANClientState *peer,
 190                                      const char *model,
 191                                      const char *name)
 192 {
 193     VLANClientState *vc;
 194
 195     assert(info->size >= sizeof(VLANClientState));
 196
 197     vc = g_malloc0(info->size);
 198
 199     vc->info = info;
 200     vc->model = g_strdup(model);
 201     if (name) {
 202         vc->name = g_strdup(name);
 203     } else {
 204         vc->name = assign_name(vc, model);
 205     }
 206
 207     if (vlan) {
 208         assert(!peer);
 209         vc->vlan = vlan;
 210         QTAILQ_INSERT_TAIL(&vc->vlan->clients, vc, next);
 211     } else {
 212         if (peer) {
 213             assert(!peer->peer);
 214             vc->peer = peer;
 215             peer->peer = vc;
 216         }
 217         QTAILQ_INSERT_TAIL(&non_vlan_clients, vc, next);
 218
 219         vc->send_queue = qemu_new_net_queue(qemu_deliver_packet,
 220                                             qemu_deliver_packet_iov,
 221                                             vc);
 222     }
 223
 224     return vc;
 225 }
 226
 227 NICState *qemu_new_nic(NetClientInfo *info,
 228                        NICConf *conf,
 229                        const char *model,
 230                        const char *name,
 231                        void *opaque)
 232 {
 233     VLANClientState *nc;
 234     NICState *nic;
 235
 236     assert(info->type == NET_CLIENT_TYPE_NIC);
 237     assert(info->size >= sizeof(NICState));
 238
 239     nc = qemu_new_net_client(info, conf->vlan, conf->peer, model, name);
 240
 241     nic = DO_UPCAST(NICState, nc, nc);
 242     nic->conf = conf;
 243     nic->opaque = opaque;
 244
 245     return nic;
 246 }
 247
 248 static void qemu_cleanup_vlan_client(VLANClientState *vc)
 249 {
 250     if (vc->vlan) {
 251         QTAILQ_REMOVE(&vc->vlan->clients, vc, next);
 252     } else {
 253         QTAILQ_REMOVE(&non_vlan_clients, vc, next);
 254     }
 255
 256     if (vc->info->cleanup) {
 257         vc->info->cleanup(vc);
 258     }
 259 }
 260
 261 static void qemu_free_vlan_client(VLANClientState *vc)
 262 {
 263     if (!vc->vlan) {
 264         if (vc->send_queue) {
 265             qemu_del_net_queue(vc->send_queue);
 266         }
 267         if (vc->peer) {
 268             vc->peer->peer = NULL;
 269         }
 270     }
 271     g_free(vc->name);
 272     g_free(vc->model);
 273     g_free(vc);
 274 }
 275
 276 void qemu_del_vlan_client(VLANClientState *vc)
 277 {
 278     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 279     if (!vc->vlan && vc->peer && vc->peer->info->type == NET_CLIENT_TYPE_NIC) {
 280         NICState *nic = DO_UPCAST(NICState, nc, vc->peer);
 281         if (nic->peer_deleted) {
 282             return;
 283         }
 284         nic->peer_deleted = true;
 285         /* Let NIC know peer is gone. */
 286         vc->peer->link_down = true;
 287         if (vc->peer->info->link_status_changed) {
 288             vc->peer->info->link_status_changed(vc->peer);
 289         }
 290         qemu_cleanup_vlan_client(vc);
 291         return;
 292     }
 293
 294     /* If this is a peer NIC and peer has already been deleted, free it now. */
 295     if (!vc->vlan && vc->peer && vc->info->type == NET_CLIENT_TYPE_NIC) {
 296         NICState *nic = DO_UPCAST(NICState, nc, vc);
 297         if (nic->peer_deleted) {
 298             qemu_free_vlan_client(vc->peer);
 299         }
 300     }
 301
 302     qemu_cleanup_vlan_client(vc);
 303     qemu_free_vlan_client(vc);
 304 }
 305
 306 VLANClientState *
 307 qemu_find_vlan_client_by_name(Monitor *mon, int vlan_id,
 308                               const char *client_str)
 309 {
 310     VLANState *vlan;
 311     VLANClientState *vc;
 312
 313     vlan = qemu_find_vlan(vlan_id, 0);
 314     if (!vlan) {
 315         monitor_printf(mon, "unknown VLAN %d\n", vlan_id);
 316         return NULL;
 317     }
 318
 319     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 320         if (!strcmp(vc->name, client_str)) {
 321             break;
 322         }
 323     }
 324     if (!vc) {
 325         monitor_printf(mon, "can't find device %s on VLAN %d\n",
 326                        client_str, vlan_id);
 327     }
 328
 329     return vc;
 330 }
 331
 332 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 333 {
 334     VLANClientState *nc;
 335     VLANState *vlan;
 336
 337     QTAILQ_FOREACH(nc, &non_vlan_clients, next) {
 338         if (nc->info->type == NET_CLIENT_TYPE_NIC) {
 339             func(DO_UPCAST(NICState, nc, nc), opaque);
 340         }
 341     }
 342
 343     QTAILQ_FOREACH(vlan, &vlans, next) {
 344         QTAILQ_FOREACH(nc, &vlan->clients, next) {
 345             if (nc->info->type == NET_CLIENT_TYPE_NIC) {
 346                 func(DO_UPCAST(NICState, nc, nc), opaque);
 347             }
 348         }
 349     }
 350 }
 351
 352 int qemu_can_send_packet(VLANClientState *sender)
 353 {
 354     VLANState *vlan = sender->vlan;
 355     VLANClientState *vc;
 356
 357     if (sender->peer) {
 358         if (sender->peer->receive_disabled) {
 359             return 0;
 360         } else if (sender->peer->info->can_receive &&
 361                    !sender->peer->info->can_receive(sender->peer)) {
 362             return 0;
 363         } else {
 364             return 1;
 365         }
 366     }
 367
 368     if (!sender->vlan) {
 369         return 1;
 370     }
 371
 372     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 373         if (vc == sender) {
 374             continue;
 375         }
 376
 377         /* no can_receive() handler, they can always receive */
 378         if (vc->info->can_receive && !vc->info->can_receive(vc)) {
 379             return 0;
 380         }
 381     }
 382     return 1;
 383 }
 384
 385 static ssize_t qemu_deliver_packet(VLANClientState *sender,
 386                                    unsigned flags,
 387                                    const uint8_t *data,
 388                                    size_t size,
 389                                    void *opaque)
 390 {
 391     VLANClientState *vc = opaque;
 392     ssize_t ret;
 393
 394     if (vc->link_down) {
 395         return size;
 396     }
 397
 398     if (vc->receive_disabled) {
 399         return 0;
 400     }
 401
 402     if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
 403         ret = vc->info->receive_raw(vc, data, size);
 404     } else {
 405         ret = vc->info->receive(vc, data, size);
 406     }
 407
 408     if (ret == 0) {
 409         vc->receive_disabled = 1;
 410     };
 411
 412     return ret;
 413 }
 414
 415 static ssize_t qemu_vlan_deliver_packet(VLANClientState *sender,
 416                                         unsigned flags,
 417                                         const uint8_t *buf,
 418                                         size_t size,
 419                                         void *opaque)
 420 {
 421     VLANState *vlan = opaque;
 422     VLANClientState *vc;
 423     ssize_t ret = -1;
 424
 425     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 426         ssize_t len;
 427
 428         if (vc == sender) {
 429             continue;
 430         }
 431
 432         if (vc->link_down) {
 433             ret = size;
 434             continue;
 435         }
 436
 437         if (vc->receive_disabled) {
 438             ret = 0;
 439             continue;
 440         }
 441
 442         if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
 443             len = vc->info->receive_raw(vc, buf, size);
 444         } else {
 445             len = vc->info->receive(vc, buf, size);
 446         }
 447
 448         if (len == 0) {
 449             vc->receive_disabled = 1;
 450         }
 451
 452         ret = (ret >= 0) ? ret : len;
 453
 454     }
 455
 456     return ret;
 457 }
 458
 459 void qemu_purge_queued_packets(VLANClientState *vc)
 460 {
 461     NetQueue *queue;
 462
 463     if (!vc->peer && !vc->vlan) {
 464         return;
 465     }
 466
 467     if (vc->peer) {
 468         queue = vc->peer->send_queue;
 469     } else {
 470         queue = vc->vlan->send_queue;
 471     }
 472
 473     qemu_net_queue_purge(queue, vc);
 474 }
 475
 476 void qemu_flush_queued_packets(VLANClientState *vc)
 477 {
 478     NetQueue *queue;
 479
 480     vc->receive_disabled = 0;
 481
 482     if (vc->vlan) {
 483         queue = vc->vlan->send_queue;
 484     } else {
 485         queue = vc->send_queue;
 486     }
 487
 488     qemu_net_queue_flush(queue);
 489 }
 490
 491 static ssize_t qemu_send_packet_async_with_flags(VLANClientState *sender,
 492                                                  unsigned flags,
 493                                                  const uint8_t *buf, int size,
 494                                                  NetPacketSent *sent_cb)
 495 {
 496     NetQueue *queue;
 497
 498 #ifdef DEBUG_NET
 499     printf("qemu_send_packet_async:\n");
 500     hex_dump(stdout, buf, size);
 501 #endif
 502
 503     if (sender->link_down || (!sender->peer && !sender->vlan)) {
 504         return size;
 505     }
 506
 507     if (sender->peer) {
 508         queue = sender->peer->send_queue;
 509     } else {
 510         queue = sender->vlan->send_queue;
 511     }
 512
 513     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 514 }
 515
 516 ssize_t qemu_send_packet_async(VLANClientState *sender,
 517                                const uint8_t *buf, int size,
 518                                NetPacketSent *sent_cb)
 519 {
 520     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 521                                              buf, size, sent_cb);
 522 }
 523
 524 void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
 525 {
 526     qemu_send_packet_async(vc, buf, size, NULL);
 527 }
 528
 529 ssize_t qemu_send_packet_raw(VLANClientState *vc, const uint8_t *buf, int size)
 530 {
 531     return qemu_send_packet_async_with_flags(vc, QEMU_NET_PACKET_FLAG_RAW,
 532                                              buf, size, NULL);
 533 }
 534
 535 static ssize_t vc_sendv_compat(VLANClientState *vc, const struct iovec *iov,
 536                                int iovcnt)
 537 {
 538     uint8_t buffer[4096];
 539     size_t offset;
 540
 541     offset = iov_to_buf(iov, iovcnt, buffer, 0, sizeof(buffer));
 542
 543     return vc->info->receive(vc, buffer, offset);
 544 }
 545
 546 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
 547                                        unsigned flags,
 548                                        const struct iovec *iov,
 549                                        int iovcnt,
 550                                        void *opaque)
 551 {
 552     VLANClientState *vc = opaque;
 553
 554     if (vc->link_down) {
 555         return iov_size(iov, iovcnt);
 556     }
 557
 558     if (vc->info->receive_iov) {
 559         return vc->info->receive_iov(vc, iov, iovcnt);
 560     } else {
 561         return vc_sendv_compat(vc, iov, iovcnt);
 562     }
 563 }
 564
 565 static ssize_t qemu_vlan_deliver_packet_iov(VLANClientState *sender,
 566                                             unsigned flags,
 567                                             const struct iovec *iov,
 568                                             int iovcnt,
 569                                             void *opaque)
 570 {
 571     VLANState *vlan = opaque;
 572     VLANClientState *vc;
 573     ssize_t ret = -1;
 574
 575     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 576         ssize_t len;
 577
 578         if (vc == sender) {
 579             continue;
 580         }
 581
 582         if (vc->link_down) {
 583             ret = iov_size(iov, iovcnt);
 584             continue;
 585         }
 586
 587         assert(!(flags & QEMU_NET_PACKET_FLAG_RAW));
 588
 589         if (vc->info->receive_iov) {
 590             len = vc->info->receive_iov(vc, iov, iovcnt);
 591         } else {
 592             len = vc_sendv_compat(vc, iov, iovcnt);
 593         }
 594
 595         ret = (ret >= 0) ? ret : len;
 596     }
 597
 598     return ret;
 599 }
 600
 601 ssize_t qemu_sendv_packet_async(VLANClientState *sender,
 602                                 const struct iovec *iov, int iovcnt,
 603                                 NetPacketSent *sent_cb)
 604 {
 605     NetQueue *queue;
 606
 607     if (sender->link_down || (!sender->peer && !sender->vlan)) {
 608         return iov_size(iov, iovcnt);
 609     }
 610
 611     if (sender->peer) {
 612         queue = sender->peer->send_queue;
 613     } else {
 614         queue = sender->vlan->send_queue;
 615     }
 616
 617     return qemu_net_queue_send_iov(queue, sender,
 618                                    QEMU_NET_PACKET_FLAG_NONE,
 619                                    iov, iovcnt, sent_cb);
 620 }
 621
 622 ssize_t
 623 qemu_sendv_packet(VLANClientState *vc, const struct iovec *iov, int iovcnt)
 624 {
 625     return qemu_sendv_packet_async(vc, iov, iovcnt, NULL);
 626 }
 627
 628 /* find or alloc a new VLAN */
 629 VLANState *qemu_find_vlan(int id, int allocate)
 630 {
 631     VLANState *vlan;
 632
 633     QTAILQ_FOREACH(vlan, &vlans, next) {
 634         if (vlan->id == id) {
 635             return vlan;
 636         }
 637     }
 638
 639     if (!allocate) {
 640         return NULL;
 641     }
 642
 643     vlan = g_malloc0(sizeof(VLANState));
 644     vlan->id = id;
 645     QTAILQ_INIT(&vlan->clients);
 646
 647     vlan->send_queue = qemu_new_net_queue(qemu_vlan_deliver_packet,
 648                                           qemu_vlan_deliver_packet_iov,
 649                                           vlan);
 650
 651     QTAILQ_INSERT_TAIL(&vlans, vlan, next);
 652
 653     return vlan;
 654 }
 655
 656 VLANClientState *qemu_find_netdev(const char *id)
 657 {
 658     VLANClientState *vc;
 659
 660     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
 661         if (vc->info->type == NET_CLIENT_TYPE_NIC)
 662             continue;
 663         if (!strcmp(vc->name, id)) {
 664             return vc;
 665         }
 666     }
 667
 668     return NULL;
 669 }
 670
 671 static int nic_get_free_idx(void)
 672 {
 673     int index;
 674
 675     for (index = 0; index < MAX_NICS; index++)
 676         if (!nd_table[index].used)
 677             return index;
 678     return -1;
 679 }
 680
 681 int qemu_show_nic_models(const char *arg, const char *const *models)
 682 {
 683     int i;
 684
 685     if (!arg || strcmp(arg, "?"))
 686         return 0;
 687
 688     fprintf(stderr, "qemu: Supported NIC models: ");
 689     for (i = 0 ; models[i]; i++)
 690         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 691     return 1;
 692 }
 693
 694 void qemu_check_nic_model(NICInfo *nd, const char *model)
 695 {
 696     const char *models[2];
 697
 698     models[0] = model;
 699     models[1] = NULL;
 700
 701     if (qemu_show_nic_models(nd->model, models))
 702         exit(0);
 703     if (qemu_find_nic_model(nd, models, model) < 0)
 704         exit(1);
 705 }
 706
 707 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 708                         const char *default_model)
 709 {
 710     int i;
 711
 712     if (!nd->model)
 713         nd->model = g_strdup(default_model);
 714
 715     for (i = 0 ; models[i]; i++) {
 716         if (strcmp(nd->model, models[i]) == 0)
 717             return i;
 718     }
 719
 720     error_report("Unsupported NIC model: %s", nd->model);
 721     return -1;
 722 }
 723
 724 int net_handle_fd_param(Monitor *mon, const char *param)
 725 {
 726     int fd;
 727
 728     if (!qemu_isdigit(param[0]) && mon) {
 729
 730         fd = monitor_get_fd(mon, param);
 731         if (fd == -1) {
 732             error_report("No file descriptor named %s found", param);
 733             return -1;
 734         }
 735     } else {
 736         fd = qemu_parse_fd(param);
 737     }
 738
 739     return fd;
 740 }
 741
 742 static int net_init_nic(QemuOpts *opts,
 743                         Monitor *mon,
 744                         const char *name,
 745                         VLANState *vlan)
 746 {
 747     int idx;
 748     NICInfo *nd;
 749     const char *netdev;
 750
 751     idx = nic_get_free_idx();
 752     if (idx == -1 || nb_nics >= MAX_NICS) {
 753         error_report("Too Many NICs");
 754         return -1;
 755     }
 756
 757     nd = &nd_table[idx];
 758
 759     memset(nd, 0, sizeof(*nd));
 760
 761     if ((netdev = qemu_opt_get(opts, "netdev"))) {
 762         nd->netdev = qemu_find_netdev(netdev);
 763         if (!nd->netdev) {
 764             error_report("netdev '%s' not found", netdev);
 765             return -1;
 766         }
 767     } else {
 768         assert(vlan);
 769         nd->vlan = vlan;
 770     }
 771     if (name) {
 772         nd->name = g_strdup(name);
 773     }
 774     if (qemu_opt_get(opts, "model")) {
 775         nd->model = g_strdup(qemu_opt_get(opts, "model"));
 776     }
 777     if (qemu_opt_get(opts, "addr")) {
 778         nd->devaddr = g_strdup(qemu_opt_get(opts, "addr"));
 779     }
 780
 781     if (qemu_opt_get(opts, "macaddr") &&
 782         net_parse_macaddr(nd->macaddr.a, qemu_opt_get(opts, "macaddr")) < 0) {
 783         error_report("invalid syntax for ethernet address");
 784         return -1;
 785     }
 786     qemu_macaddr_default_if_unset(&nd->macaddr);
 787
 788     nd->nvectors = qemu_opt_get_number(opts, "vectors",
 789                                        DEV_NVECTORS_UNSPECIFIED);
 790     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
 791         (nd->nvectors < 0 || nd->nvectors > 0x7ffffff)) {
 792         error_report("invalid # of vectors: %d", nd->nvectors);
 793         return -1;
 794     }
 795
 796     nd->used = 1;
 797     nb_nics++;
 798
 799     return idx;
 800 }
 801
 802 #define NET_COMMON_PARAMS_DESC                     \
 803     {                                              \
 804         .name = "type",                            \
 805         .type = QEMU_OPT_STRING,                   \
 806         .help = "net client type (nic, tap etc.)", \
 807      }, {                                          \
 808         .name = "vlan",                            \
 809         .type = QEMU_OPT_NUMBER,                   \
 810         .help = "vlan number",                     \
 811      }, {                                          \
 812         .name = "name",                            \
 813         .type = QEMU_OPT_STRING,                   \
 814         .help = "identifier for monitor commands", \
 815      }
 816
 817 typedef int (*net_client_init_func)(QemuOpts *opts,
 818                                     Monitor *mon,
 819                                     const char *name,
 820                                     VLANState *vlan);
 821
 822 /* magic number, but compiler will warn if too small */
 823 #define NET_MAX_DESC 20
 824
 825 static const struct {
 826     const char *type;
 827     net_client_init_func init;
 828     QemuOptDesc desc[NET_MAX_DESC];
 829 } net_client_types[NET_CLIENT_TYPE_MAX] = {
 830     [NET_CLIENT_TYPE_NONE] = {
 831         .type = "none",
 832         .desc = {
 833             NET_COMMON_PARAMS_DESC,
 834             { /* end of list */ }
 835         },
 836     },
 837     [NET_CLIENT_TYPE_NIC] = {
 838         .type = "nic",
 839         .init = net_init_nic,
 840         .desc = {
 841             NET_COMMON_PARAMS_DESC,
 842             {
 843                 .name = "netdev",
 844                 .type = QEMU_OPT_STRING,
 845                 .help = "id of -netdev to connect to",
 846             },
 847             {
 848                 .name = "macaddr",
 849                 .type = QEMU_OPT_STRING,
 850                 .help = "MAC address",
 851             }, {
 852                 .name = "model",
 853                 .type = QEMU_OPT_STRING,
 854                 .help = "device model (e1000, rtl8139, virtio etc.)",
 855             }, {
 856                 .name = "addr",
 857                 .type = QEMU_OPT_STRING,
 858                 .help = "PCI device address",
 859             }, {
 860                 .name = "vectors",
 861                 .type = QEMU_OPT_NUMBER,
 862                 .help = "number of MSI-x vectors, 0 to disable MSI-X",
 863             },
 864             { /* end of list */ }
 865         },
 866     },
 867 #ifdef CONFIG_SLIRP
 868     [NET_CLIENT_TYPE_USER] = {
 869         .type = "user",
 870         .init = net_init_slirp,
 871         .desc = {
 872             NET_COMMON_PARAMS_DESC,
 873             {
 874                 .name = "hostname",
 875                 .type = QEMU_OPT_STRING,
 876                 .help = "client hostname reported by the builtin DHCP server",
 877             }, {
 878                 .name = "restrict",
 879                 .type = QEMU_OPT_STRING,
 880                 .help = "isolate the guest from the host (y|yes|n|no)",
 881             }, {
 882                 .name = "ip",
 883                 .type = QEMU_OPT_STRING,
 884                 .help = "legacy parameter, use net= instead",
 885             }, {
 886                 .name = "net",
 887                 .type = QEMU_OPT_STRING,
 888                 .help = "IP address and optional netmask",
 889             }, {
 890                 .name = "host",
 891                 .type = QEMU_OPT_STRING,
 892                 .help = "guest-visible address of the host",
 893             }, {
 894                 .name = "tftp",
 895                 .type = QEMU_OPT_STRING,
 896                 .help = "root directory of the built-in TFTP server",
 897             }, {
 898                 .name = "bootfile",
 899                 .type = QEMU_OPT_STRING,
 900                 .help = "BOOTP filename, for use with tftp=",
 901             }, {
 902                 .name = "dhcpstart",
 903                 .type = QEMU_OPT_STRING,
 904                 .help = "the first of the 16 IPs the built-in DHCP server can assign",
 905             }, {
 906                 .name = "dns",
 907                 .type = QEMU_OPT_STRING,
 908                 .help = "guest-visible address of the virtual nameserver",
 909             }, {
 910                 .name = "smb",
 911                 .type = QEMU_OPT_STRING,
 912                 .help = "root directory of the built-in SMB server",
 913             }, {
 914                 .name = "smbserver",
 915                 .type = QEMU_OPT_STRING,
 916                 .help = "IP address of the built-in SMB server",
 917             }, {
 918                 .name = "hostfwd",
 919                 .type = QEMU_OPT_STRING,
 920                 .help = "guest port number to forward incoming TCP or UDP connections",
 921             }, {
 922                 .name = "guestfwd",
 923                 .type = QEMU_OPT_STRING,
 924                 .help = "IP address and port to forward guest TCP connections",
 925             },
 926             { /* end of list */ }
 927         },
 928     },
 929 #endif
 930     [NET_CLIENT_TYPE_TAP] = {
 931         .type = "tap",
 932         .init = net_init_tap,
 933         .desc = {
 934             NET_COMMON_PARAMS_DESC,
 935             {
 936                 .name = "ifname",
 937                 .type = QEMU_OPT_STRING,
 938                 .help = "interface name",
 939             },
 940 #ifndef _WIN32
 941             {
 942                 .name = "fd",
 943                 .type = QEMU_OPT_STRING,
 944                 .help = "file descriptor of an already opened tap",
 945             }, {
 946                 .name = "script",
 947                 .type = QEMU_OPT_STRING,
 948                 .help = "script to initialize the interface",
 949             }, {
 950                 .name = "downscript",
 951                 .type = QEMU_OPT_STRING,
 952                 .help = "script to shut down the interface",
 953             }, {
 954                 .name = "sndbuf",
 955                 .type = QEMU_OPT_SIZE,
 956                 .help = "send buffer limit"
 957             }, {
 958                 .name = "vnet_hdr",
 959                 .type = QEMU_OPT_BOOL,
 960                 .help = "enable the IFF_VNET_HDR flag on the tap interface"
 961             }, {
 962                 .name = "vhost",
 963                 .type = QEMU_OPT_BOOL,
 964                 .help = "enable vhost-net network accelerator",
 965             }, {
 966                 .name = "vhostfd",
 967                 .type = QEMU_OPT_STRING,
 968                 .help = "file descriptor of an already opened vhost net device",
 969             }, {
 970                 .name = "vhostforce",
 971                 .type = QEMU_OPT_BOOL,
 972                 .help = "force vhost on for non-MSIX virtio guests",
 973         },
 974 #endif /* _WIN32 */
 975             { /* end of list */ }
 976         },
 977     },
 978     [NET_CLIENT_TYPE_SOCKET] = {
 979         .type = "socket",
 980         .init = net_init_socket,
 981         .desc = {
 982             NET_COMMON_PARAMS_DESC,
 983             {
 984                 .name = "fd",
 985                 .type = QEMU_OPT_STRING,
 986                 .help = "file descriptor of an already opened socket",
 987             }, {
 988                 .name = "listen",
 989                 .type = QEMU_OPT_STRING,
 990                 .help = "port number, and optional hostname, to listen on",
 991             }, {
 992                 .name = "connect",
 993                 .type = QEMU_OPT_STRING,
 994                 .help = "port number, and optional hostname, to connect to",
 995             }, {
 996                 .name = "mcast",
 997                 .type = QEMU_OPT_STRING,
 998                 .help = "UDP multicast address and port number",
 999             }, {
1000                 .name = "localaddr",
1001                 .type = QEMU_OPT_STRING,
1002                 .help = "source address for multicast packets",
1003             },
1004             { /* end of list */ }
1005         },
1006     },
1007 #ifdef CONFIG_VDE
1008     [NET_CLIENT_TYPE_VDE] = {
1009         .type = "vde",
1010         .init = net_init_vde,
1011         .desc = {
1012             NET_COMMON_PARAMS_DESC,
1013             {
1014                 .name = "sock",
1015                 .type = QEMU_OPT_STRING,
1016                 .help = "socket path",
1017             }, {
1018                 .name = "port",
1019                 .type = QEMU_OPT_NUMBER,
1020                 .help = "port number",
1021             }, {
1022                 .name = "group",
1023                 .type = QEMU_OPT_STRING,
1024                 .help = "group owner of socket",
1025             }, {
1026                 .name = "mode",
1027                 .type = QEMU_OPT_NUMBER,
1028                 .help = "permissions for socket",
1029             },
1030             { /* end of list */ }
1031         },
1032     },
1033 #endif
1034     [NET_CLIENT_TYPE_DUMP] = {
1035         .type = "dump",
1036         .init = net_init_dump,
1037         .desc = {
1038             NET_COMMON_PARAMS_DESC,
1039             {
1040                 .name = "len",
1041                 .type = QEMU_OPT_SIZE,
1042                 .help = "per-packet size limit (64k default)",
1043             }, {
1044                 .name = "file",
1045                 .type = QEMU_OPT_STRING,
1046                 .help = "dump file path (default is qemu-vlan0.pcap)",
1047             },
1048             { /* end of list */ }
1049         },
1050     },
1051 };
1052
1053 int net_client_init(Monitor *mon, QemuOpts *opts, int is_netdev)
1054 {
1055     const char *name;
1056     const char *type;
1057     int i;
1058
1059     type = qemu_opt_get(opts, "type");
1060     if (!type) {
1061         qerror_report(QERR_MISSING_PARAMETER, "type");
1062         return -1;
1063     }
1064
1065     if (is_netdev) {
1066         if (strcmp(type, "tap") != 0 &&
1067 #ifdef CONFIG_SLIRP
1068             strcmp(type, "user") != 0 &&
1069 #endif
1070 #ifdef CONFIG_VDE
1071             strcmp(type, "vde") != 0 &&
1072 #endif
1073             strcmp(type, "socket") != 0) {
1074             qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
1075                           "a netdev backend type");
1076             return -1;
1077         }
1078
1079         if (qemu_opt_get(opts, "vlan")) {
1080             qerror_report(QERR_INVALID_PARAMETER, "vlan");
1081             return -1;
1082         }
1083         if (qemu_opt_get(opts, "name")) {
1084             qerror_report(QERR_INVALID_PARAMETER, "name");
1085             return -1;
1086         }
1087         if (!qemu_opts_id(opts)) {
1088             qerror_report(QERR_MISSING_PARAMETER, "id");
1089             return -1;
1090         }
1091     }
1092
1093     name = qemu_opts_id(opts);
1094     if (!name) {
1095         name = qemu_opt_get(opts, "name");
1096     }
1097
1098     for (i = 0; i < NET_CLIENT_TYPE_MAX; i++) {
1099         if (net_client_types[i].type != NULL &&
1100             !strcmp(net_client_types[i].type, type)) {
1101             VLANState *vlan = NULL;
1102             int ret;
1103
1104             if (qemu_opts_validate(opts, &net_client_types[i].desc[0]) == -1) {
1105                 return -1;
1106             }
1107
1108             /* Do not add to a vlan if it's a -netdev or a nic with a
1109              * netdev= parameter. */
1110             if (!(is_netdev ||
1111                   (strcmp(type, "nic") == 0 && qemu_opt_get(opts, "netdev")))) {
1112                 vlan = qemu_find_vlan(qemu_opt_get_number(opts, "vlan", 0), 1);
1113             }
1114
1115             ret = 0;
1116             if (net_client_types[i].init) {
1117                 ret = net_client_types[i].init(opts, mon, name, vlan);
1118                 if (ret < 0) {
1119                     /* TODO push error reporting into init() methods */
1120                     qerror_report(QERR_DEVICE_INIT_FAILED, type);
1121                     return -1;
1122                 }
1123             }
1124             return ret;
1125         }
1126     }
1127
1128     qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
1129                   "a network client type");
1130     return -1;
1131 }
1132
1133 static int net_host_check_device(const char *device)
1134 {
1135     int i;
1136     const char *valid_param_list[] = { "tap", "socket", "dump"
1137 #ifdef CONFIG_SLIRP
1138                                        ,"user"
1139 #endif
1140 #ifdef CONFIG_VDE
1141                                        ,"vde"
1142 #endif
1143     };
1144     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
1145         if (!strncmp(valid_param_list[i], device,
1146                      strlen(valid_param_list[i])))
1147             return 1;
1148     }
1149
1150     return 0;
1151 }
1152
1153 void net_host_device_add(Monitor *mon, const QDict *qdict)
1154 {
1155     const char *device = qdict_get_str(qdict, "device");
1156     const char *opts_str = qdict_get_try_str(qdict, "opts");
1157     QemuOpts *opts;
1158
1159     if (!net_host_check_device(device)) {
1160         monitor_printf(mon, "invalid host network device %s\n", device);
1161         return;
1162     }
1163
1164     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
1165     if (!opts) {
1166         return;
1167     }
1168
1169     qemu_opt_set(opts, "type", device);
1170
1171     if (net_client_init(mon, opts, 0) < 0) {
1172         monitor_printf(mon, "adding host network device %s failed\n", device);
1173     }
1174 }
1175
1176 void net_host_device_remove(Monitor *mon, const QDict *qdict)
1177 {
1178     VLANClientState *vc;
1179     int vlan_id = qdict_get_int(qdict, "vlan_id");
1180     const char *device = qdict_get_str(qdict, "device");
1181
1182     vc = qemu_find_vlan_client_by_name(mon, vlan_id, device);
1183     if (!vc) {
1184         return;
1185     }
1186     if (!net_host_check_device(vc->model)) {
1187         monitor_printf(mon, "invalid host network device %s\n", device);
1188         return;
1189     }
1190     qemu_del_vlan_client(vc);
1191 }
1192
1193 int do_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
1194 {
1195     QemuOpts *opts;
1196     int res;
1197
1198     opts = qemu_opts_from_qdict(qemu_find_opts("netdev"), qdict);
1199     if (!opts) {
1200         return -1;
1201     }
1202
1203     res = net_client_init(mon, opts, 1);
1204     if (res < 0) {
1205         qemu_opts_del(opts);
1206     }
1207
1208     return res;
1209 }
1210
1211 int do_netdev_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1212 {
1213     const char *id = qdict_get_str(qdict, "id");
1214     VLANClientState *vc;
1215
1216     vc = qemu_find_netdev(id);
1217     if (!vc) {
1218         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1219         return -1;
1220     }
1221     qemu_del_vlan_client(vc);
1222     qemu_opts_del(qemu_opts_find(qemu_find_opts("netdev"), id));
1223     return 0;
1224 }
1225
1226 static void print_net_client(Monitor *mon, VLANClientState *vc)
1227 {
1228     monitor_printf(mon, "%s: type=%s,%s\n", vc->name,
1229                    net_client_types[vc->info->type].type, vc->info_str);
1230 }
1231
1232 void do_info_network(Monitor *mon)
1233 {
1234     VLANState *vlan;
1235     VLANClientState *vc, *peer;
1236     net_client_type type;
1237
1238     QTAILQ_FOREACH(vlan, &vlans, next) {
1239         monitor_printf(mon, "VLAN %d devices:\n", vlan->id);
1240
1241         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1242             monitor_printf(mon, "  ");
1243             print_net_client(mon, vc);
1244         }
1245     }
1246     monitor_printf(mon, "Devices not on any VLAN:\n");
1247     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1248         peer = vc->peer;
1249         type = vc->info->type;
1250         if (!peer || type == NET_CLIENT_TYPE_NIC) {
1251             monitor_printf(mon, "  ");
1252             print_net_client(mon, vc);
1253         } /* else it's a netdev connected to a NIC, printed with the NIC */
1254         if (peer && type == NET_CLIENT_TYPE_NIC) {
1255             monitor_printf(mon, "   \\ ");
1256             print_net_client(mon, peer);
1257         }
1258     }
1259 }
1260
1261 int do_set_link(Monitor *mon, const QDict *qdict, QObject **ret_data)
1262 {
1263     VLANState *vlan;
1264     VLANClientState *vc = NULL;
1265     const char *name = qdict_get_str(qdict, "name");
1266     int up = qdict_get_bool(qdict, "up");
1267
1268     QTAILQ_FOREACH(vlan, &vlans, next) {
1269         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1270             if (strcmp(vc->name, name) == 0) {
1271                 goto done;
1272             }
1273         }
1274     }
1275     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1276         if (!strcmp(vc->name, name)) {
1277             goto done;
1278         }
1279     }
1280 done:
1281
1282     if (!vc) {
1283         qerror_report(QERR_DEVICE_NOT_FOUND, name);
1284         return -1;
1285     }
1286
1287     vc->link_down = !up;
1288
1289     if (vc->info->link_status_changed) {
1290         vc->info->link_status_changed(vc);
1291     }
1292
1293     /* Notify peer. Don't update peer link status: this makes it possible to
1294      * disconnect from host network without notifying the guest.
1295      * FIXME: is disconnected link status change operation useful?
1296      *
1297      * Current behaviour is compatible with qemu vlans where there could be
1298      * multiple clients that can still communicate with each other in
1299      * disconnected mode. For now maintain this compatibility. */
1300     if (vc->peer && vc->peer->info->link_status_changed) {
1301         vc->peer->info->link_status_changed(vc->peer);
1302     }
1303     return 0;
1304 }
1305
1306 void net_cleanup(void)
1307 {
1308     VLANState *vlan;
1309     VLANClientState *vc, *next_vc;
1310
1311     QTAILQ_FOREACH(vlan, &vlans, next) {
1312         QTAILQ_FOREACH_SAFE(vc, &vlan->clients, next, next_vc) {
1313             qemu_del_vlan_client(vc);
1314         }
1315     }
1316
1317     QTAILQ_FOREACH_SAFE(vc, &non_vlan_clients, next, next_vc) {
1318         qemu_del_vlan_client(vc);
1319     }
1320 }
1321
1322 void net_check_clients(void)
1323 {
1324     VLANState *vlan;
1325     VLANClientState *vc;
1326     int i;
1327
1328     /* Don't warn about the default network setup that you get if
1329      * no command line -net or -netdev options are specified. There
1330      * are two cases that we would otherwise complain about:
1331      * (1) board doesn't support a NIC but the implicit "-net nic"
1332      * requested one
1333      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1334      * sets up a nic that isn't connected to anything.
1335      */
1336     if (default_net) {
1337         return;
1338     }
1339
1340     QTAILQ_FOREACH(vlan, &vlans, next) {
1341         int has_nic = 0, has_host_dev = 0;
1342
1343         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1344             switch (vc->info->type) {
1345             case NET_CLIENT_TYPE_NIC:
1346                 has_nic = 1;
1347                 break;
1348             case NET_CLIENT_TYPE_USER:
1349             case NET_CLIENT_TYPE_TAP:
1350             case NET_CLIENT_TYPE_SOCKET:
1351             case NET_CLIENT_TYPE_VDE:
1352                 has_host_dev = 1;
1353                 break;
1354             default: ;
1355             }
1356         }
1357         if (has_host_dev && !has_nic)
1358             fprintf(stderr, "Warning: vlan %d with no nics\n", vlan->id);
1359         if (has_nic && !has_host_dev)
1360             fprintf(stderr,
1361                     "Warning: vlan %d is not connected to host network\n",
1362                     vlan->id);
1363     }
1364     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1365         if (!vc->peer) {
1366             fprintf(stderr, "Warning: %s %s has no peer\n",
1367                     vc->info->type == NET_CLIENT_TYPE_NIC ? "nic" : "netdev",
1368                     vc->name);
1369         }
1370     }
1371
1372     /* Check that all NICs requested via -net nic actually got created.
1373      * NICs created via -device don't need to be checked here because
1374      * they are always instantiated.
1375      */
1376     for (i = 0; i < MAX_NICS; i++) {
1377         NICInfo *nd = &nd_table[i];
1378         if (nd->used && !nd->instantiated) {
1379             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1380                     "was not created (not supported by this machine?)\n",
1381                     nd->name ? nd->name : "anonymous",
1382                     nd->model ? nd->model : "unspecified");
1383         }
1384     }
1385 }
1386
1387 static int net_init_client(QemuOpts *opts, void *dummy)
1388 {
1389     if (net_client_init(NULL, opts, 0) < 0)
1390         return -1;
1391     return 0;
1392 }
1393
1394 static int net_init_netdev(QemuOpts *opts, void *dummy)
1395 {
1396     return net_client_init(NULL, opts, 1);
1397 }
1398
1399 int net_init_clients(void)
1400 {
1401     QemuOptsList *net = qemu_find_opts("net");
1402
1403     if (default_net) {
1404         /* if no clients, we use a default config */
1405         qemu_opts_set(net, NULL, "type", "nic");
1406 #ifdef CONFIG_SLIRP
1407         qemu_opts_set(net, NULL, "type", "user");
1408 #endif
1409     }
1410
1411     QTAILQ_INIT(&vlans);
1412     QTAILQ_INIT(&non_vlan_clients);
1413
1414     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1415         return -1;
1416
1417     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1418         return -1;
1419     }
1420
1421     return 0;
1422 }
1423
1424 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1425 {
1426 #if defined(CONFIG_SLIRP)
1427     int ret;
1428     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1429         return ret;
1430     }
1431 #endif
1432
1433     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1434         return -1;
1435     }
1436
1437     default_net = 0;
1438     return 0;
1439 }