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     char buf[256];
 154     int id = 0;
 155
 156     QTAILQ_FOREACH(vlan, &vlans, next) {
 157         VLANClientState *vc;
 158
 159         QTAILQ_FOREACH(vc, &vlan->clients, next) {
 160             if (vc != vc1 && strcmp(vc->model, model) == 0) {
 161                 id++;
 162             }
 163         }
 164     }
 165
 166     snprintf(buf, sizeof(buf), "%s.%d", model, id);
 167
 168     return qemu_strdup(buf);
 169 }
 170
 171 static ssize_t qemu_deliver_packet(VLANClientState *sender,
 172                                    unsigned flags,
 173                                    const uint8_t *data,
 174                                    size_t size,
 175                                    void *opaque);
 176 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
 177                                        unsigned flags,
 178                                        const struct iovec *iov,
 179                                        int iovcnt,
 180                                        void *opaque);
 181
 182 VLANClientState *qemu_new_net_client(NetClientInfo *info,
 183                                      VLANState *vlan,
 184                                      VLANClientState *peer,
 185                                      const char *model,
 186                                      const char *name)
 187 {
 188     VLANClientState *vc;
 189
 190     assert(info->size >= sizeof(VLANClientState));
 191
 192     vc = qemu_mallocz(info->size);
 193
 194     vc->info = info;
 195     vc->model = qemu_strdup(model);
 196     if (name) {
 197         vc->name = qemu_strdup(name);
 198     } else {
 199         vc->name = assign_name(vc, model);
 200     }
 201
 202     if (vlan) {
 203         assert(!peer);
 204         vc->vlan = vlan;
 205         QTAILQ_INSERT_TAIL(&vc->vlan->clients, vc, next);
 206     } else {
 207         if (peer) {
 208             assert(!peer->peer);
 209             vc->peer = peer;
 210             peer->peer = vc;
 211         }
 212         QTAILQ_INSERT_TAIL(&non_vlan_clients, vc, next);
 213
 214         vc->send_queue = qemu_new_net_queue(qemu_deliver_packet,
 215                                             qemu_deliver_packet_iov,
 216                                             vc);
 217     }
 218
 219     return vc;
 220 }
 221
 222 NICState *qemu_new_nic(NetClientInfo *info,
 223                        NICConf *conf,
 224                        const char *model,
 225                        const char *name,
 226                        void *opaque)
 227 {
 228     VLANClientState *nc;
 229     NICState *nic;
 230
 231     assert(info->type == NET_CLIENT_TYPE_NIC);
 232     assert(info->size >= sizeof(NICState));
 233
 234     nc = qemu_new_net_client(info, conf->vlan, conf->peer, model, name);
 235
 236     nic = DO_UPCAST(NICState, nc, nc);
 237     nic->conf = conf;
 238     nic->opaque = opaque;
 239
 240     return nic;
 241 }
 242
 243 static void qemu_cleanup_vlan_client(VLANClientState *vc)
 244 {
 245     if (vc->vlan) {
 246         QTAILQ_REMOVE(&vc->vlan->clients, vc, next);
 247     } else {
 248         QTAILQ_REMOVE(&non_vlan_clients, vc, next);
 249     }
 250
 251     if (vc->info->cleanup) {
 252         vc->info->cleanup(vc);
 253     }
 254 }
 255
 256 static void qemu_free_vlan_client(VLANClientState *vc)
 257 {
 258     if (!vc->vlan) {
 259         if (vc->send_queue) {
 260             qemu_del_net_queue(vc->send_queue);
 261         }
 262         if (vc->peer) {
 263             vc->peer->peer = NULL;
 264         }
 265     }
 266     qemu_free(vc->name);
 267     qemu_free(vc->model);
 268     qemu_free(vc);
 269 }
 270
 271 void qemu_del_vlan_client(VLANClientState *vc)
 272 {
 273     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 274     if (!vc->vlan && vc->peer && vc->peer->info->type == NET_CLIENT_TYPE_NIC) {
 275         NICState *nic = DO_UPCAST(NICState, nc, vc->peer);
 276         if (nic->peer_deleted) {
 277             return;
 278         }
 279         nic->peer_deleted = true;
 280         /* Let NIC know peer is gone. */
 281         vc->peer->link_down = true;
 282         if (vc->peer->info->link_status_changed) {
 283             vc->peer->info->link_status_changed(vc->peer);
 284         }
 285         qemu_cleanup_vlan_client(vc);
 286         return;
 287     }
 288
 289     /* If this is a peer NIC and peer has already been deleted, free it now. */
 290     if (!vc->vlan && vc->peer && vc->info->type == NET_CLIENT_TYPE_NIC) {
 291         NICState *nic = DO_UPCAST(NICState, nc, vc);
 292         if (nic->peer_deleted) {
 293             qemu_free_vlan_client(vc->peer);
 294         }
 295     }
 296
 297     qemu_cleanup_vlan_client(vc);
 298     qemu_free_vlan_client(vc);
 299 }
 300
 301 VLANClientState *
 302 qemu_find_vlan_client_by_name(Monitor *mon, int vlan_id,
 303                               const char *client_str)
 304 {
 305     VLANState *vlan;
 306     VLANClientState *vc;
 307
 308     vlan = qemu_find_vlan(vlan_id, 0);
 309     if (!vlan) {
 310         monitor_printf(mon, "unknown VLAN %d\n", vlan_id);
 311         return NULL;
 312     }
 313
 314     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 315         if (!strcmp(vc->name, client_str)) {
 316             break;
 317         }
 318     }
 319     if (!vc) {
 320         monitor_printf(mon, "can't find device %s on VLAN %d\n",
 321                        client_str, vlan_id);
 322     }
 323
 324     return vc;
 325 }
 326
 327 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 328 {
 329     VLANClientState *nc;
 330     VLANState *vlan;
 331
 332     QTAILQ_FOREACH(nc, &non_vlan_clients, next) {
 333         if (nc->info->type == NET_CLIENT_TYPE_NIC) {
 334             func(DO_UPCAST(NICState, nc, nc), opaque);
 335         }
 336     }
 337
 338     QTAILQ_FOREACH(vlan, &vlans, next) {
 339         QTAILQ_FOREACH(nc, &vlan->clients, next) {
 340             if (nc->info->type == NET_CLIENT_TYPE_NIC) {
 341                 func(DO_UPCAST(NICState, nc, nc), opaque);
 342             }
 343         }
 344     }
 345 }
 346
 347 int qemu_can_send_packet(VLANClientState *sender)
 348 {
 349     VLANState *vlan = sender->vlan;
 350     VLANClientState *vc;
 351
 352     if (sender->peer) {
 353         if (sender->peer->receive_disabled) {
 354             return 0;
 355         } else if (sender->peer->info->can_receive &&
 356                    !sender->peer->info->can_receive(sender->peer)) {
 357             return 0;
 358         } else {
 359             return 1;
 360         }
 361     }
 362
 363     if (!sender->vlan) {
 364         return 1;
 365     }
 366
 367     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 368         if (vc == sender) {
 369             continue;
 370         }
 371
 372         /* no can_receive() handler, they can always receive */
 373         if (vc->info->can_receive && !vc->info->can_receive(vc)) {
 374             return 0;
 375         }
 376     }
 377     return 1;
 378 }
 379
 380 static ssize_t qemu_deliver_packet(VLANClientState *sender,
 381                                    unsigned flags,
 382                                    const uint8_t *data,
 383                                    size_t size,
 384                                    void *opaque)
 385 {
 386     VLANClientState *vc = opaque;
 387     ssize_t ret;
 388
 389     if (vc->link_down) {
 390         return size;
 391     }
 392
 393     if (vc->receive_disabled) {
 394         return 0;
 395     }
 396
 397     if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
 398         ret = vc->info->receive_raw(vc, data, size);
 399     } else {
 400         ret = vc->info->receive(vc, data, size);
 401     }
 402
 403     if (ret == 0) {
 404         vc->receive_disabled = 1;
 405     };
 406
 407     return ret;
 408 }
 409
 410 static ssize_t qemu_vlan_deliver_packet(VLANClientState *sender,
 411                                         unsigned flags,
 412                                         const uint8_t *buf,
 413                                         size_t size,
 414                                         void *opaque)
 415 {
 416     VLANState *vlan = opaque;
 417     VLANClientState *vc;
 418     ssize_t ret = -1;
 419
 420     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 421         ssize_t len;
 422
 423         if (vc == sender) {
 424             continue;
 425         }
 426
 427         if (vc->link_down) {
 428             ret = size;
 429             continue;
 430         }
 431
 432         if (vc->receive_disabled) {
 433             ret = 0;
 434             continue;
 435         }
 436
 437         if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
 438             len = vc->info->receive_raw(vc, buf, size);
 439         } else {
 440             len = vc->info->receive(vc, buf, size);
 441         }
 442
 443         if (len == 0) {
 444             vc->receive_disabled = 1;
 445         }
 446
 447         ret = (ret >= 0) ? ret : len;
 448
 449     }
 450
 451     return ret;
 452 }
 453
 454 void qemu_purge_queued_packets(VLANClientState *vc)
 455 {
 456     NetQueue *queue;
 457
 458     if (!vc->peer && !vc->vlan) {
 459         return;
 460     }
 461
 462     if (vc->peer) {
 463         queue = vc->peer->send_queue;
 464     } else {
 465         queue = vc->vlan->send_queue;
 466     }
 467
 468     qemu_net_queue_purge(queue, vc);
 469 }
 470
 471 void qemu_flush_queued_packets(VLANClientState *vc)
 472 {
 473     NetQueue *queue;
 474
 475     vc->receive_disabled = 0;
 476
 477     if (vc->vlan) {
 478         queue = vc->vlan->send_queue;
 479     } else {
 480         queue = vc->send_queue;
 481     }
 482
 483     qemu_net_queue_flush(queue);
 484 }
 485
 486 static ssize_t qemu_send_packet_async_with_flags(VLANClientState *sender,
 487                                                  unsigned flags,
 488                                                  const uint8_t *buf, int size,
 489                                                  NetPacketSent *sent_cb)
 490 {
 491     NetQueue *queue;
 492
 493 #ifdef DEBUG_NET
 494     printf("qemu_send_packet_async:\n");
 495     hex_dump(stdout, buf, size);
 496 #endif
 497
 498     if (sender->link_down || (!sender->peer && !sender->vlan)) {
 499         return size;
 500     }
 501
 502     if (sender->peer) {
 503         queue = sender->peer->send_queue;
 504     } else {
 505         queue = sender->vlan->send_queue;
 506     }
 507
 508     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 509 }
 510
 511 ssize_t qemu_send_packet_async(VLANClientState *sender,
 512                                const uint8_t *buf, int size,
 513                                NetPacketSent *sent_cb)
 514 {
 515     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 516                                              buf, size, sent_cb);
 517 }
 518
 519 void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
 520 {
 521     qemu_send_packet_async(vc, buf, size, NULL);
 522 }
 523
 524 ssize_t qemu_send_packet_raw(VLANClientState *vc, const uint8_t *buf, int size)
 525 {
 526     return qemu_send_packet_async_with_flags(vc, QEMU_NET_PACKET_FLAG_RAW,
 527                                              buf, size, NULL);
 528 }
 529
 530 static ssize_t vc_sendv_compat(VLANClientState *vc, const struct iovec *iov,
 531                                int iovcnt)
 532 {
 533     uint8_t buffer[4096];
 534     size_t offset;
 535
 536     offset = iov_to_buf(iov, iovcnt, buffer, 0, sizeof(buffer));
 537
 538     return vc->info->receive(vc, buffer, offset);
 539 }
 540
 541 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
 542                                        unsigned flags,
 543                                        const struct iovec *iov,
 544                                        int iovcnt,
 545                                        void *opaque)
 546 {
 547     VLANClientState *vc = opaque;
 548
 549     if (vc->link_down) {
 550         return iov_size(iov, iovcnt);
 551     }
 552
 553     if (vc->info->receive_iov) {
 554         return vc->info->receive_iov(vc, iov, iovcnt);
 555     } else {
 556         return vc_sendv_compat(vc, iov, iovcnt);
 557     }
 558 }
 559
 560 static ssize_t qemu_vlan_deliver_packet_iov(VLANClientState *sender,
 561                                             unsigned flags,
 562                                             const struct iovec *iov,
 563                                             int iovcnt,
 564                                             void *opaque)
 565 {
 566     VLANState *vlan = opaque;
 567     VLANClientState *vc;
 568     ssize_t ret = -1;
 569
 570     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 571         ssize_t len;
 572
 573         if (vc == sender) {
 574             continue;
 575         }
 576
 577         if (vc->link_down) {
 578             ret = iov_size(iov, iovcnt);
 579             continue;
 580         }
 581
 582         assert(!(flags & QEMU_NET_PACKET_FLAG_RAW));
 583
 584         if (vc->info->receive_iov) {
 585             len = vc->info->receive_iov(vc, iov, iovcnt);
 586         } else {
 587             len = vc_sendv_compat(vc, iov, iovcnt);
 588         }
 589
 590         ret = (ret >= 0) ? ret : len;
 591     }
 592
 593     return ret;
 594 }
 595
 596 ssize_t qemu_sendv_packet_async(VLANClientState *sender,
 597                                 const struct iovec *iov, int iovcnt,
 598                                 NetPacketSent *sent_cb)
 599 {
 600     NetQueue *queue;
 601
 602     if (sender->link_down || (!sender->peer && !sender->vlan)) {
 603         return iov_size(iov, iovcnt);
 604     }
 605
 606     if (sender->peer) {
 607         queue = sender->peer->send_queue;
 608     } else {
 609         queue = sender->vlan->send_queue;
 610     }
 611
 612     return qemu_net_queue_send_iov(queue, sender,
 613                                    QEMU_NET_PACKET_FLAG_NONE,
 614                                    iov, iovcnt, sent_cb);
 615 }
 616
 617 ssize_t
 618 qemu_sendv_packet(VLANClientState *vc, const struct iovec *iov, int iovcnt)
 619 {
 620     return qemu_sendv_packet_async(vc, iov, iovcnt, NULL);
 621 }
 622
 623 /* find or alloc a new VLAN */
 624 VLANState *qemu_find_vlan(int id, int allocate)
 625 {
 626     VLANState *vlan;
 627
 628     QTAILQ_FOREACH(vlan, &vlans, next) {
 629         if (vlan->id == id) {
 630             return vlan;
 631         }
 632     }
 633
 634     if (!allocate) {
 635         return NULL;
 636     }
 637
 638     vlan = qemu_mallocz(sizeof(VLANState));
 639     vlan->id = id;
 640     QTAILQ_INIT(&vlan->clients);
 641
 642     vlan->send_queue = qemu_new_net_queue(qemu_vlan_deliver_packet,
 643                                           qemu_vlan_deliver_packet_iov,
 644                                           vlan);
 645
 646     QTAILQ_INSERT_TAIL(&vlans, vlan, next);
 647
 648     return vlan;
 649 }
 650
 651 VLANClientState *qemu_find_netdev(const char *id)
 652 {
 653     VLANClientState *vc;
 654
 655     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
 656         if (!strcmp(vc->name, id)) {
 657             return vc;
 658         }
 659     }
 660
 661     return NULL;
 662 }
 663
 664 static int nic_get_free_idx(void)
 665 {
 666     int index;
 667
 668     for (index = 0; index < MAX_NICS; index++)
 669         if (!nd_table[index].used)
 670             return index;
 671     return -1;
 672 }
 673
 674 int qemu_show_nic_models(const char *arg, const char *const *models)
 675 {
 676     int i;
 677
 678     if (!arg || strcmp(arg, "?"))
 679         return 0;
 680
 681     fprintf(stderr, "qemu: Supported NIC models: ");
 682     for (i = 0 ; models[i]; i++)
 683         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 684     return 1;
 685 }
 686
 687 void qemu_check_nic_model(NICInfo *nd, const char *model)
 688 {
 689     const char *models[2];
 690
 691     models[0] = model;
 692     models[1] = NULL;
 693
 694     if (qemu_show_nic_models(nd->model, models))
 695         exit(0);
 696     if (qemu_find_nic_model(nd, models, model) < 0)
 697         exit(1);
 698 }
 699
 700 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 701                         const char *default_model)
 702 {
 703     int i;
 704
 705     if (!nd->model)
 706         nd->model = qemu_strdup(default_model);
 707
 708     for (i = 0 ; models[i]; i++) {
 709         if (strcmp(nd->model, models[i]) == 0)
 710             return i;
 711     }
 712
 713     error_report("qemu: Unsupported NIC model: %s", nd->model);
 714     return -1;
 715 }
 716
 717 int net_handle_fd_param(Monitor *mon, const char *param)
 718 {
 719     int fd;
 720
 721     if (!qemu_isdigit(param[0]) && mon) {
 722
 723         fd = monitor_get_fd(mon, param);
 724         if (fd == -1) {
 725             error_report("No file descriptor named %s found", param);
 726             return -1;
 727         }
 728     } else {
 729         char *endptr = NULL;
 730
 731         fd = strtol(param, &endptr, 10);
 732         if (*endptr || (fd == 0 && param == endptr)) {
 733             return -1;
 734         }
 735     }
 736
 737     return fd;
 738 }
 739
 740 static int net_init_nic(QemuOpts *opts,
 741                         Monitor *mon,
 742                         const char *name,
 743                         VLANState *vlan)
 744 {
 745     int idx;
 746     NICInfo *nd;
 747     const char *netdev;
 748
 749     idx = nic_get_free_idx();
 750     if (idx == -1 || nb_nics >= MAX_NICS) {
 751         error_report("Too Many NICs");
 752         return -1;
 753     }
 754
 755     nd = &nd_table[idx];
 756
 757     memset(nd, 0, sizeof(*nd));
 758
 759     if ((netdev = qemu_opt_get(opts, "netdev"))) {
 760         nd->netdev = qemu_find_netdev(netdev);
 761         if (!nd->netdev) {
 762             error_report("netdev '%s' not found", netdev);
 763             return -1;
 764         }
 765     } else {
 766         assert(vlan);
 767         nd->vlan = vlan;
 768     }
 769     if (name) {
 770         nd->name = qemu_strdup(name);
 771     }
 772     if (qemu_opt_get(opts, "model")) {
 773         nd->model = qemu_strdup(qemu_opt_get(opts, "model"));
 774     }
 775     if (qemu_opt_get(opts, "addr")) {
 776         nd->devaddr = qemu_strdup(qemu_opt_get(opts, "addr"));
 777     }
 778
 779     nd->macaddr[0] = 0x52;
 780     nd->macaddr[1] = 0x54;
 781     nd->macaddr[2] = 0x00;
 782     nd->macaddr[3] = 0x12;
 783     nd->macaddr[4] = 0x34;
 784     nd->macaddr[5] = 0x56 + idx;
 785
 786     if (qemu_opt_get(opts, "macaddr") &&
 787         net_parse_macaddr(nd->macaddr, qemu_opt_get(opts, "macaddr")) < 0) {
 788         error_report("invalid syntax for ethernet address");
 789         return -1;
 790     }
 791
 792     nd->nvectors = qemu_opt_get_number(opts, "vectors",
 793                                        DEV_NVECTORS_UNSPECIFIED);
 794     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
 795         (nd->nvectors < 0 || nd->nvectors > 0x7ffffff)) {
 796         error_report("invalid # of vectors: %d", nd->nvectors);
 797         return -1;
 798     }
 799
 800     nd->used = 1;
 801     nb_nics++;
 802
 803     return idx;
 804 }
 805
 806 #define NET_COMMON_PARAMS_DESC                     \
 807     {                                              \
 808         .name = "type",                            \
 809         .type = QEMU_OPT_STRING,                   \
 810         .help = "net client type (nic, tap etc.)", \
 811      }, {                                          \
 812         .name = "vlan",                            \
 813         .type = QEMU_OPT_NUMBER,                   \
 814         .help = "vlan number",                     \
 815      }, {                                          \
 816         .name = "name",                            \
 817         .type = QEMU_OPT_STRING,                   \
 818         .help = "identifier for monitor commands", \
 819      }
 820
 821 typedef int (*net_client_init_func)(QemuOpts *opts,
 822                                     Monitor *mon,
 823                                     const char *name,
 824                                     VLANState *vlan);
 825
 826 /* magic number, but compiler will warn if too small */
 827 #define NET_MAX_DESC 20
 828
 829 static const struct {
 830     const char *type;
 831     net_client_init_func init;
 832     QemuOptDesc desc[NET_MAX_DESC];
 833 } net_client_types[] = {
 834     {
 835         .type = "none",
 836         .desc = {
 837             NET_COMMON_PARAMS_DESC,
 838             { /* end of list */ }
 839         },
 840     }, {
 841         .type = "nic",
 842         .init = net_init_nic,
 843         .desc = {
 844             NET_COMMON_PARAMS_DESC,
 845             {
 846                 .name = "netdev",
 847                 .type = QEMU_OPT_STRING,
 848                 .help = "id of -netdev to connect to",
 849             },
 850             {
 851                 .name = "macaddr",
 852                 .type = QEMU_OPT_STRING,
 853                 .help = "MAC address",
 854             }, {
 855                 .name = "model",
 856                 .type = QEMU_OPT_STRING,
 857                 .help = "device model (e1000, rtl8139, virtio etc.)",
 858             }, {
 859                 .name = "addr",
 860                 .type = QEMU_OPT_STRING,
 861                 .help = "PCI device address",
 862             }, {
 863                 .name = "vectors",
 864                 .type = QEMU_OPT_NUMBER,
 865                 .help = "number of MSI-x vectors, 0 to disable MSI-X",
 866             },
 867             { /* end of list */ }
 868         },
 869 #ifdef CONFIG_SLIRP
 870     }, {
 871         .type = "user",
 872         .init = net_init_slirp,
 873         .desc = {
 874             NET_COMMON_PARAMS_DESC,
 875             {
 876                 .name = "hostname",
 877                 .type = QEMU_OPT_STRING,
 878                 .help = "client hostname reported by the builtin DHCP server",
 879             }, {
 880                 .name = "restrict",
 881                 .type = QEMU_OPT_STRING,
 882                 .help = "isolate the guest from the host (y|yes|n|no)",
 883             }, {
 884                 .name = "ip",
 885                 .type = QEMU_OPT_STRING,
 886                 .help = "legacy parameter, use net= instead",
 887             }, {
 888                 .name = "net",
 889                 .type = QEMU_OPT_STRING,
 890                 .help = "IP address and optional netmask",
 891             }, {
 892                 .name = "host",
 893                 .type = QEMU_OPT_STRING,
 894                 .help = "guest-visible address of the host",
 895             }, {
 896                 .name = "tftp",
 897                 .type = QEMU_OPT_STRING,
 898                 .help = "root directory of the built-in TFTP server",
 899             }, {
 900                 .name = "bootfile",
 901                 .type = QEMU_OPT_STRING,
 902                 .help = "BOOTP filename, for use with tftp=",
 903             }, {
 904                 .name = "dhcpstart",
 905                 .type = QEMU_OPT_STRING,
 906                 .help = "the first of the 16 IPs the built-in DHCP server can assign",
 907             }, {
 908                 .name = "dns",
 909                 .type = QEMU_OPT_STRING,
 910                 .help = "guest-visible address of the virtual nameserver",
 911             }, {
 912                 .name = "smb",
 913                 .type = QEMU_OPT_STRING,
 914                 .help = "root directory of the built-in SMB server",
 915             }, {
 916                 .name = "smbserver",
 917                 .type = QEMU_OPT_STRING,
 918                 .help = "IP address of the built-in SMB server",
 919             }, {
 920                 .name = "hostfwd",
 921                 .type = QEMU_OPT_STRING,
 922                 .help = "guest port number to forward incoming TCP or UDP connections",
 923             }, {
 924                 .name = "guestfwd",
 925                 .type = QEMU_OPT_STRING,
 926                 .help = "IP address and port to forward guest TCP connections",
 927             },
 928             { /* end of list */ }
 929         },
 930 #endif
 931     }, {
 932         .type = "tap",
 933         .init = net_init_tap,
 934         .desc = {
 935             NET_COMMON_PARAMS_DESC,
 936             {
 937                 .name = "ifname",
 938                 .type = QEMU_OPT_STRING,
 939                 .help = "interface name",
 940             },
 941 #ifndef _WIN32
 942             {
 943                 .name = "fd",
 944                 .type = QEMU_OPT_STRING,
 945                 .help = "file descriptor of an already opened tap",
 946             }, {
 947                 .name = "script",
 948                 .type = QEMU_OPT_STRING,
 949                 .help = "script to initialize the interface",
 950             }, {
 951                 .name = "downscript",
 952                 .type = QEMU_OPT_STRING,
 953                 .help = "script to shut down the interface",
 954             }, {
 955                 .name = "sndbuf",
 956                 .type = QEMU_OPT_SIZE,
 957                 .help = "send buffer limit"
 958             }, {
 959                 .name = "vnet_hdr",
 960                 .type = QEMU_OPT_BOOL,
 961                 .help = "enable the IFF_VNET_HDR flag on the tap interface"
 962             }, {
 963                 .name = "vhost",
 964                 .type = QEMU_OPT_BOOL,
 965                 .help = "enable vhost-net network accelerator",
 966             }, {
 967                 .name = "vhostfd",
 968                 .type = QEMU_OPT_STRING,
 969                 .help = "file descriptor of an already opened vhost net device",
 970             }, {
 971                 .name = "vhostforce",
 972                 .type = QEMU_OPT_BOOL,
 973                 .help = "force vhost on for non-MSIX virtio guests",
 974         },
 975 #endif /* _WIN32 */
 976             { /* end of list */ }
 977         },
 978     }, {
 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 #ifdef CONFIG_VDE
1007     }, {
1008         .type = "vde",
1009         .init = net_init_vde,
1010         .desc = {
1011             NET_COMMON_PARAMS_DESC,
1012             {
1013                 .name = "sock",
1014                 .type = QEMU_OPT_STRING,
1015                 .help = "socket path",
1016             }, {
1017                 .name = "port",
1018                 .type = QEMU_OPT_NUMBER,
1019                 .help = "port number",
1020             }, {
1021                 .name = "group",
1022                 .type = QEMU_OPT_STRING,
1023                 .help = "group owner of socket",
1024             }, {
1025                 .name = "mode",
1026                 .type = QEMU_OPT_NUMBER,
1027                 .help = "permissions for socket",
1028             },
1029             { /* end of list */ }
1030         },
1031 #endif
1032     }, {
1033         .type = "dump",
1034         .init = net_init_dump,
1035         .desc = {
1036             NET_COMMON_PARAMS_DESC,
1037             {
1038                 .name = "len",
1039                 .type = QEMU_OPT_SIZE,
1040                 .help = "per-packet size limit (64k default)",
1041             }, {
1042                 .name = "file",
1043                 .type = QEMU_OPT_STRING,
1044                 .help = "dump file path (default is qemu-vlan0.pcap)",
1045             },
1046             { /* end of list */ }
1047         },
1048     },
1049     { /* end of list */ }
1050 };
1051
1052 int net_client_init(Monitor *mon, QemuOpts *opts, int is_netdev)
1053 {
1054     const char *name;
1055     const char *type;
1056     int i;
1057
1058     type = qemu_opt_get(opts, "type");
1059     if (!type) {
1060         qerror_report(QERR_MISSING_PARAMETER, "type");
1061         return -1;
1062     }
1063
1064     if (is_netdev) {
1065         if (strcmp(type, "tap") != 0 &&
1066 #ifdef CONFIG_SLIRP
1067             strcmp(type, "user") != 0 &&
1068 #endif
1069 #ifdef CONFIG_VDE
1070             strcmp(type, "vde") != 0 &&
1071 #endif
1072             strcmp(type, "socket") != 0) {
1073             qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
1074                           "a netdev backend type");
1075             return -1;
1076         }
1077
1078         if (qemu_opt_get(opts, "vlan")) {
1079             qerror_report(QERR_INVALID_PARAMETER, "vlan");
1080             return -1;
1081         }
1082         if (qemu_opt_get(opts, "name")) {
1083             qerror_report(QERR_INVALID_PARAMETER, "name");
1084             return -1;
1085         }
1086         if (!qemu_opts_id(opts)) {
1087             qerror_report(QERR_MISSING_PARAMETER, "id");
1088             return -1;
1089         }
1090     }
1091
1092     name = qemu_opts_id(opts);
1093     if (!name) {
1094         name = qemu_opt_get(opts, "name");
1095     }
1096
1097     for (i = 0; net_client_types[i].type != NULL; i++) {
1098         if (!strcmp(net_client_types[i].type, type)) {
1099             VLANState *vlan = NULL;
1100             int ret;
1101
1102             if (qemu_opts_validate(opts, &net_client_types[i].desc[0]) == -1) {
1103                 return -1;
1104             }
1105
1106             /* Do not add to a vlan if it's a -netdev or a nic with a
1107              * netdev= parameter. */
1108             if (!(is_netdev ||
1109                   (strcmp(type, "nic") == 0 && qemu_opt_get(opts, "netdev")))) {
1110                 vlan = qemu_find_vlan(qemu_opt_get_number(opts, "vlan", 0), 1);
1111             }
1112
1113             ret = 0;
1114             if (net_client_types[i].init) {
1115                 ret = net_client_types[i].init(opts, mon, name, vlan);
1116                 if (ret < 0) {
1117                     /* TODO push error reporting into init() methods */
1118                     qerror_report(QERR_DEVICE_INIT_FAILED, type);
1119                     return -1;
1120                 }
1121             }
1122             return ret;
1123         }
1124     }
1125
1126     qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
1127                   "a network client type");
1128     return -1;
1129 }
1130
1131 static int net_host_check_device(const char *device)
1132 {
1133     int i;
1134     const char *valid_param_list[] = { "tap", "socket", "dump"
1135 #ifdef CONFIG_SLIRP
1136                                        ,"user"
1137 #endif
1138 #ifdef CONFIG_VDE
1139                                        ,"vde"
1140 #endif
1141     };
1142     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
1143         if (!strncmp(valid_param_list[i], device,
1144                      strlen(valid_param_list[i])))
1145             return 1;
1146     }
1147
1148     return 0;
1149 }
1150
1151 void net_host_device_add(Monitor *mon, const QDict *qdict)
1152 {
1153     const char *device = qdict_get_str(qdict, "device");
1154     const char *opts_str = qdict_get_try_str(qdict, "opts");
1155     QemuOpts *opts;
1156
1157     if (!net_host_check_device(device)) {
1158         monitor_printf(mon, "invalid host network device %s\n", device);
1159         return;
1160     }
1161
1162     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
1163     if (!opts) {
1164         return;
1165     }
1166
1167     qemu_opt_set(opts, "type", device);
1168
1169     if (net_client_init(mon, opts, 0) < 0) {
1170         monitor_printf(mon, "adding host network device %s failed\n", device);
1171     }
1172 }
1173
1174 void net_host_device_remove(Monitor *mon, const QDict *qdict)
1175 {
1176     VLANClientState *vc;
1177     int vlan_id = qdict_get_int(qdict, "vlan_id");
1178     const char *device = qdict_get_str(qdict, "device");
1179
1180     vc = qemu_find_vlan_client_by_name(mon, vlan_id, device);
1181     if (!vc) {
1182         return;
1183     }
1184     if (!net_host_check_device(vc->model)) {
1185         monitor_printf(mon, "invalid host network device %s\n", device);
1186         return;
1187     }
1188     qemu_del_vlan_client(vc);
1189 }
1190
1191 int do_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
1192 {
1193     QemuOpts *opts;
1194     int res;
1195
1196     opts = qemu_opts_from_qdict(qemu_find_opts("netdev"), qdict);
1197     if (!opts) {
1198         return -1;
1199     }
1200
1201     res = net_client_init(mon, opts, 1);
1202     if (res < 0) {
1203         qemu_opts_del(opts);
1204     }
1205
1206     return res;
1207 }
1208
1209 int do_netdev_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1210 {
1211     const char *id = qdict_get_str(qdict, "id");
1212     VLANClientState *vc;
1213
1214     vc = qemu_find_netdev(id);
1215     if (!vc || vc->info->type == NET_CLIENT_TYPE_NIC) {
1216         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1217         return -1;
1218     }
1219     qemu_del_vlan_client(vc);
1220     qemu_opts_del(qemu_opts_find(qemu_find_opts("netdev"), id));
1221     return 0;
1222 }
1223
1224 void do_info_network(Monitor *mon)
1225 {
1226     VLANState *vlan;
1227     VLANClientState *vc;
1228
1229     QTAILQ_FOREACH(vlan, &vlans, next) {
1230         monitor_printf(mon, "VLAN %d devices:\n", vlan->id);
1231
1232         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1233             monitor_printf(mon, "  %s: %s\n", vc->name, vc->info_str);
1234         }
1235     }
1236     monitor_printf(mon, "Devices not on any VLAN:\n");
1237     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1238         monitor_printf(mon, "  %s: %s", vc->name, vc->info_str);
1239         if (vc->peer) {
1240             monitor_printf(mon, " peer=%s", vc->peer->name);
1241         }
1242         monitor_printf(mon, "\n");
1243     }
1244 }
1245
1246 int do_set_link(Monitor *mon, const QDict *qdict, QObject **ret_data)
1247 {
1248     VLANState *vlan;
1249     VLANClientState *vc = NULL;
1250     const char *name = qdict_get_str(qdict, "name");
1251     int up = qdict_get_bool(qdict, "up");
1252
1253     QTAILQ_FOREACH(vlan, &vlans, next) {
1254         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1255             if (strcmp(vc->name, name) == 0) {
1256                 goto done;
1257             }
1258         }
1259     }
1260     vc = qemu_find_netdev(name);
1261 done:
1262
1263     if (!vc) {
1264         qerror_report(QERR_DEVICE_NOT_FOUND, name);
1265         return -1;
1266     }
1267
1268     vc->link_down = !up;
1269
1270     if (vc->info->link_status_changed) {
1271         vc->info->link_status_changed(vc);
1272     }
1273
1274     /* Notify peer. Don't update peer link status: this makes it possible to
1275      * disconnect from host network without notifying the guest.
1276      * FIXME: is disconnected link status change operation useful?
1277      *
1278      * Current behaviour is compatible with qemu vlans where there could be
1279      * multiple clients that can still communicate with each other in
1280      * disconnected mode. For now maintain this compatibility. */
1281     if (vc->peer && vc->peer->info->link_status_changed) {
1282         vc->peer->info->link_status_changed(vc->peer);
1283     }
1284     return 0;
1285 }
1286
1287 void net_cleanup(void)
1288 {
1289     VLANState *vlan;
1290     VLANClientState *vc, *next_vc;
1291
1292     QTAILQ_FOREACH(vlan, &vlans, next) {
1293         QTAILQ_FOREACH_SAFE(vc, &vlan->clients, next, next_vc) {
1294             qemu_del_vlan_client(vc);
1295         }
1296     }
1297
1298     QTAILQ_FOREACH_SAFE(vc, &non_vlan_clients, next, next_vc) {
1299         qemu_del_vlan_client(vc);
1300     }
1301 }
1302
1303 void net_check_clients(void)
1304 {
1305     VLANState *vlan;
1306     VLANClientState *vc;
1307     int seen_nics = 0;
1308
1309     /* Don't warn about the default network setup that you get if
1310      * no command line -net options are specified. There are two
1311      * cases that we would otherwise complain about:
1312      * (1) board doesn't support a NIC but the implicit "-net nic"
1313      * requested one; we'd otherwise complain about more NICs being
1314      * specified than we support, and also that the vlan set up by
1315      * the implicit "-net user" didn't have any NICs connected to it
1316      * (2) CONFIG_SLIRP not set: we'd otherwise complain about the
1317      * implicit "-net nic" setting up a nic that wasn't connected to
1318      * anything.
1319      */
1320     if (default_net) {
1321         return;
1322     }
1323
1324     QTAILQ_FOREACH(vlan, &vlans, next) {
1325         int has_nic = 0, has_host_dev = 0;
1326
1327         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1328             switch (vc->info->type) {
1329             case NET_CLIENT_TYPE_NIC:
1330                 seen_nics++;
1331                 has_nic = 1;
1332                 break;
1333             case NET_CLIENT_TYPE_SLIRP:
1334             case NET_CLIENT_TYPE_TAP:
1335             case NET_CLIENT_TYPE_SOCKET:
1336             case NET_CLIENT_TYPE_VDE:
1337                 has_host_dev = 1;
1338                 break;
1339             default: ;
1340             }
1341         }
1342         if (has_host_dev && !has_nic)
1343             fprintf(stderr, "Warning: vlan %d with no nics\n", vlan->id);
1344         if (has_nic && !has_host_dev)
1345             fprintf(stderr,
1346                     "Warning: vlan %d is not connected to host network\n",
1347                     vlan->id);
1348     }
1349     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1350         if (vc->info->type == NET_CLIENT_TYPE_NIC) {
1351             seen_nics++;
1352         }
1353         if (!vc->peer) {
1354             fprintf(stderr, "Warning: %s %s has no peer\n",
1355                     vc->info->type == NET_CLIENT_TYPE_NIC ? "nic" : "netdev",
1356                     vc->name);
1357         }
1358     }
1359     if (seen_nics != nb_nics) {
1360         /* Number of NICs requested by user on command line doesn't match
1361          * the number the model actually registered with us.
1362          * This will generally only happen for models of embedded boards
1363          * with no PCI bus or similar. PCI based machines can instantiate
1364          * all requested NICs as PCI devices but usually embedded boards
1365          * only have a single NIC.
1366          */
1367         fprintf(stderr, "Warning: more nics requested than this machine "
1368                 "supports; some have been ignored\n");
1369     }
1370 }
1371
1372 static int net_init_client(QemuOpts *opts, void *dummy)
1373 {
1374     if (net_client_init(NULL, opts, 0) < 0)
1375         return -1;
1376     return 0;
1377 }
1378
1379 static int net_init_netdev(QemuOpts *opts, void *dummy)
1380 {
1381     return net_client_init(NULL, opts, 1);
1382 }
1383
1384 int net_init_clients(void)
1385 {
1386     QemuOptsList *net = qemu_find_opts("net");
1387
1388     if (default_net) {
1389         /* if no clients, we use a default config */
1390         qemu_opts_set(net, NULL, "type", "nic");
1391 #ifdef CONFIG_SLIRP
1392         qemu_opts_set(net, NULL, "type", "user");
1393 #endif
1394     }
1395
1396     QTAILQ_INIT(&vlans);
1397     QTAILQ_INIT(&non_vlan_clients);
1398
1399     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1400         return -1;
1401
1402     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1403         return -1;
1404     }
1405
1406     return 0;
1407 }
1408
1409 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1410 {
1411 #if defined(CONFIG_SLIRP)
1412     int ret;
1413     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1414         return ret;
1415     }
1416 #endif
1417
1418     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1419         return -1;
1420     }
1421
1422     default_net = 0;
1423     return 0;
1424 }