net/net.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "config-host.h"
  25
  26 #include "net/net.h"
  27 #include "clients.h"
  28 #include "hub.h"
  29 #include "net/slirp.h"
  30 #include "net/eth.h"
  31 #include "util.h"
  32
  33 #include "monitor/monitor.h"
  34 #include "qemu-common.h"
  35 #include "qemu/sockets.h"
  36 #include "qemu/config-file.h"
  37 #include "qmp-commands.h"
  38 #include "hw/qdev.h"
  39 #include "qemu/iov.h"
  40 #include "qemu/main-loop.h"
  41 #include "qapi-visit.h"
  42 #include "qapi/opts-visitor.h"
  43 #include "qapi/dealloc-visitor.h"
  44
  45 /* Net bridge is currently not supported for W32. */
  46 #if !defined(_WIN32)
  47 # define CONFIG_NET_BRIDGE
  48 #endif
  49
  50 static QTAILQ_HEAD(, NetClientState) net_clients;
  51
  52 const char *host_net_devices[] = {
  53     "tap",
  54     "socket",
  55     "dump",
  56 #ifdef CONFIG_NET_BRIDGE
  57     "bridge",
  58 #endif
  59 #ifdef CONFIG_SLIRP
  60     "user",
  61 #endif
  62 #ifdef CONFIG_VDE
  63     "vde",
  64 #endif
  65     "vhost-user",
  66     NULL,
  67 };
  68
  69 int default_net = 1;
  70
  71 /***********************************************************/
  72 /* network device redirectors */
  73
  74 #if defined(DEBUG_NET)
  75 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  76 {
  77     int len, i, j, c;
  78
  79     for(i=0;i<size;i+=16) {
  80         len = size - i;
  81         if (len > 16)
  82             len = 16;
  83         fprintf(f, "%08x ", i);
  84         for(j=0;j<16;j++) {
  85             if (j < len)
  86                 fprintf(f, " %02x", buf[i+j]);
  87             else
  88                 fprintf(f, "   ");
  89         }
  90         fprintf(f, " ");
  91         for(j=0;j<len;j++) {
  92             c = buf[i+j];
  93             if (c < ' ' || c > '~')
  94                 c = '.';
  95             fprintf(f, "%c", c);
  96         }
  97         fprintf(f, "\n");
  98     }
  99 }
 100 #endif
 101
 102 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
 103 {
 104     const char *p, *p1;
 105     int len;
 106     p = *pp;
 107     p1 = strchr(p, sep);
 108     if (!p1)
 109         return -1;
 110     len = p1 - p;
 111     p1++;
 112     if (buf_size > 0) {
 113         if (len > buf_size - 1)
 114             len = buf_size - 1;
 115         memcpy(buf, p, len);
 116         buf[len] = '\0';
 117     }
 118     *pp = p1;
 119     return 0;
 120 }
 121
 122 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 123 {
 124     char buf[512];
 125     struct hostent *he;
 126     const char *p, *r;
 127     int port;
 128
 129     p = str;
 130     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 131         return -1;
 132     saddr->sin_family = AF_INET;
 133     if (buf[0] == '\0') {
 134         saddr->sin_addr.s_addr = 0;
 135     } else {
 136         if (qemu_isdigit(buf[0])) {
 137             if (!inet_aton(buf, &saddr->sin_addr))
 138                 return -1;
 139         } else {
 140             if ((he = gethostbyname(buf)) == NULL)
 141                 return - 1;
 142             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 143         }
 144     }
 145     port = strtol(p, (char **)&r, 0);
 146     if (r == p)
 147         return -1;
 148     saddr->sin_port = htons(port);
 149     return 0;
 150 }
 151
 152 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 153 {
 154     snprintf(nc->info_str, sizeof(nc->info_str),
 155              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 156              nc->model,
 157              macaddr[0], macaddr[1], macaddr[2],
 158              macaddr[3], macaddr[4], macaddr[5]);
 159 }
 160
 161 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 162 {
 163     static int index = 0;
 164     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 165
 166     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 167         return;
 168     macaddr->a[0] = 0x52;
 169     macaddr->a[1] = 0x54;
 170     macaddr->a[2] = 0x00;
 171     macaddr->a[3] = 0x12;
 172     macaddr->a[4] = 0x34;
 173     macaddr->a[5] = 0x56 + index++;
 174 }
 175
 176 /**
 177  * Generate a name for net client
 178  *
 179  * Only net clients created with the legacy -net option and NICs need this.
 180  */
 181 static char *assign_name(NetClientState *nc1, const char *model)
 182 {
 183     NetClientState *nc;
 184     int id = 0;
 185
 186     QTAILQ_FOREACH(nc, &net_clients, next) {
 187         if (nc == nc1) {
 188             continue;
 189         }
 190         if (strcmp(nc->model, model) == 0) {
 191             id++;
 192         }
 193     }
 194
 195     return g_strdup_printf("%s.%d", model, id);
 196 }
 197
 198 static void qemu_net_client_destructor(NetClientState *nc)
 199 {
 200     g_free(nc);
 201 }
 202
 203 static void qemu_net_client_setup(NetClientState *nc,
 204                                   NetClientInfo *info,
 205                                   NetClientState *peer,
 206                                   const char *model,
 207                                   const char *name,
 208                                   NetClientDestructor *destructor)
 209 {
 210     nc->info = info;
 211     nc->model = g_strdup(model);
 212     if (name) {
 213         nc->name = g_strdup(name);
 214     } else {
 215         nc->name = assign_name(nc, model);
 216     }
 217
 218     if (peer) {
 219         assert(!peer->peer);
 220         nc->peer = peer;
 221         peer->peer = nc;
 222     }
 223     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 224
 225     nc->incoming_queue = qemu_new_net_queue(nc);
 226     nc->destructor = destructor;
 227 }
 228
 229 NetClientState *qemu_new_net_client(NetClientInfo *info,
 230                                     NetClientState *peer,
 231                                     const char *model,
 232                                     const char *name)
 233 {
 234     NetClientState *nc;
 235
 236     assert(info->size >= sizeof(NetClientState));
 237
 238     nc = g_malloc0(info->size);
 239     qemu_net_client_setup(nc, info, peer, model, name,
 240                           qemu_net_client_destructor);
 241
 242     return nc;
 243 }
 244
 245 NICState *qemu_new_nic(NetClientInfo *info,
 246                        NICConf *conf,
 247                        const char *model,
 248                        const char *name,
 249                        void *opaque)
 250 {
 251     NetClientState **peers = conf->peers.ncs;
 252     NICState *nic;
 253     int i, queues = MAX(1, conf->peers.queues);
 254
 255     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 256     assert(info->size >= sizeof(NICState));
 257
 258     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 259     nic->ncs = (void *)nic + info->size;
 260     nic->conf = conf;
 261     nic->opaque = opaque;
 262
 263     for (i = 0; i < queues; i++) {
 264         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 265                               NULL);
 266         nic->ncs[i].queue_index = i;
 267     }
 268
 269     return nic;
 270 }
 271
 272 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 273 {
 274     return nic->ncs + queue_index;
 275 }
 276
 277 NetClientState *qemu_get_queue(NICState *nic)
 278 {
 279     return qemu_get_subqueue(nic, 0);
 280 }
 281
 282 NICState *qemu_get_nic(NetClientState *nc)
 283 {
 284     NetClientState *nc0 = nc - nc->queue_index;
 285
 286     return (NICState *)((void *)nc0 - nc->info->size);
 287 }
 288
 289 void *qemu_get_nic_opaque(NetClientState *nc)
 290 {
 291     NICState *nic = qemu_get_nic(nc);
 292
 293     return nic->opaque;
 294 }
 295
 296 static void qemu_cleanup_net_client(NetClientState *nc)
 297 {
 298     QTAILQ_REMOVE(&net_clients, nc, next);
 299
 300     if (nc->info->cleanup) {
 301         nc->info->cleanup(nc);
 302     }
 303 }
 304
 305 static void qemu_free_net_client(NetClientState *nc)
 306 {
 307     if (nc->incoming_queue) {
 308         qemu_del_net_queue(nc->incoming_queue);
 309     }
 310     if (nc->peer) {
 311         nc->peer->peer = NULL;
 312     }
 313     g_free(nc->name);
 314     g_free(nc->model);
 315     if (nc->destructor) {
 316         nc->destructor(nc);
 317     }
 318 }
 319
 320 void qemu_del_net_client(NetClientState *nc)
 321 {
 322     NetClientState *ncs[MAX_QUEUE_NUM];
 323     int queues, i;
 324
 325     /* If the NetClientState belongs to a multiqueue backend, we will change all
 326      * other NetClientStates also.
 327      */
 328     queues = qemu_find_net_clients_except(nc->name, ncs,
 329                                           NET_CLIENT_OPTIONS_KIND_NIC,
 330                                           MAX_QUEUE_NUM);
 331     assert(queues != 0);
 332
 333     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 334     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 335         NICState *nic = qemu_get_nic(nc->peer);
 336         if (nic->peer_deleted) {
 337             return;
 338         }
 339         nic->peer_deleted = true;
 340
 341         for (i = 0; i < queues; i++) {
 342             ncs[i]->peer->link_down = true;
 343         }
 344
 345         if (nc->peer->info->link_status_changed) {
 346             nc->peer->info->link_status_changed(nc->peer);
 347         }
 348
 349         for (i = 0; i < queues; i++) {
 350             qemu_cleanup_net_client(ncs[i]);
 351         }
 352
 353         return;
 354     }
 355
 356     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 357
 358     for (i = 0; i < queues; i++) {
 359         qemu_cleanup_net_client(ncs[i]);
 360         qemu_free_net_client(ncs[i]);
 361     }
 362 }
 363
 364 void qemu_del_nic(NICState *nic)
 365 {
 366     int i, queues = MAX(nic->conf->peers.queues, 1);
 367
 368     /* If this is a peer NIC and peer has already been deleted, free it now. */
 369     if (nic->peer_deleted) {
 370         for (i = 0; i < queues; i++) {
 371             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 372         }
 373     }
 374
 375     for (i = queues - 1; i >= 0; i--) {
 376         NetClientState *nc = qemu_get_subqueue(nic, i);
 377
 378         qemu_cleanup_net_client(nc);
 379         qemu_free_net_client(nc);
 380     }
 381
 382     g_free(nic);
 383 }
 384
 385 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 386 {
 387     NetClientState *nc;
 388
 389     QTAILQ_FOREACH(nc, &net_clients, next) {
 390         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 391             if (nc->queue_index == 0) {
 392                 func(qemu_get_nic(nc), opaque);
 393             }
 394         }
 395     }
 396 }
 397
 398 bool qemu_has_ufo(NetClientState *nc)
 399 {
 400     if (!nc || !nc->info->has_ufo) {
 401         return false;
 402     }
 403
 404     return nc->info->has_ufo(nc);
 405 }
 406
 407 bool qemu_has_vnet_hdr(NetClientState *nc)
 408 {
 409     if (!nc || !nc->info->has_vnet_hdr) {
 410         return false;
 411     }
 412
 413     return nc->info->has_vnet_hdr(nc);
 414 }
 415
 416 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 417 {
 418     if (!nc || !nc->info->has_vnet_hdr_len) {
 419         return false;
 420     }
 421
 422     return nc->info->has_vnet_hdr_len(nc, len);
 423 }
 424
 425 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 426 {
 427     if (!nc || !nc->info->using_vnet_hdr) {
 428         return;
 429     }
 430
 431     nc->info->using_vnet_hdr(nc, enable);
 432 }
 433
 434 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 435                           int ecn, int ufo)
 436 {
 437     if (!nc || !nc->info->set_offload) {
 438         return;
 439     }
 440
 441     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 442 }
 443
 444 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 445 {
 446     if (!nc || !nc->info->set_vnet_hdr_len) {
 447         return;
 448     }
 449
 450     nc->info->set_vnet_hdr_len(nc, len);
 451 }
 452
 453 int qemu_can_send_packet(NetClientState *sender)
 454 {
 455     if (!sender->peer) {
 456         return 1;
 457     }
 458
 459     if (sender->peer->receive_disabled) {
 460         return 0;
 461     } else if (sender->peer->info->can_receive &&
 462                !sender->peer->info->can_receive(sender->peer)) {
 463         return 0;
 464     }
 465     return 1;
 466 }
 467
 468 ssize_t qemu_deliver_packet(NetClientState *sender,
 469                             unsigned flags,
 470                             const uint8_t *data,
 471                             size_t size,
 472                             void *opaque)
 473 {
 474     NetClientState *nc = opaque;
 475     ssize_t ret;
 476
 477     if (nc->link_down) {
 478         return size;
 479     }
 480
 481     if (nc->receive_disabled) {
 482         return 0;
 483     }
 484
 485     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 486         ret = nc->info->receive_raw(nc, data, size);
 487     } else {
 488         ret = nc->info->receive(nc, data, size);
 489     }
 490
 491     if (ret == 0) {
 492         nc->receive_disabled = 1;
 493     }
 494
 495     return ret;
 496 }
 497
 498 void qemu_purge_queued_packets(NetClientState *nc)
 499 {
 500     if (!nc->peer) {
 501         return;
 502     }
 503
 504     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 505 }
 506
 507 void qemu_flush_queued_packets(NetClientState *nc)
 508 {
 509     nc->receive_disabled = 0;
 510
 511     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 512         if (net_hub_flush(nc->peer)) {
 513             qemu_notify_event();
 514         }
 515     }
 516     if (qemu_net_queue_flush(nc->incoming_queue)) {
 517         /* We emptied the queue successfully, signal to the IO thread to repoll
 518          * the file descriptor (for tap, for example).
 519          */
 520         qemu_notify_event();
 521     }
 522 }
 523
 524 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 525                                                  unsigned flags,
 526                                                  const uint8_t *buf, int size,
 527                                                  NetPacketSent *sent_cb)
 528 {
 529     NetQueue *queue;
 530
 531 #ifdef DEBUG_NET
 532     printf("qemu_send_packet_async:\n");
 533     hex_dump(stdout, buf, size);
 534 #endif
 535
 536     if (sender->link_down || !sender->peer) {
 537         return size;
 538     }
 539
 540     queue = sender->peer->incoming_queue;
 541
 542     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 543 }
 544
 545 ssize_t qemu_send_packet_async(NetClientState *sender,
 546                                const uint8_t *buf, int size,
 547                                NetPacketSent *sent_cb)
 548 {
 549     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 550                                              buf, size, sent_cb);
 551 }
 552
 553 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 554 {
 555     qemu_send_packet_async(nc, buf, size, NULL);
 556 }
 557
 558 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 559 {
 560     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 561                                              buf, size, NULL);
 562 }
 563
 564 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 565                                int iovcnt)
 566 {
 567     uint8_t buffer[NET_BUFSIZE];
 568     size_t offset;
 569
 570     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 571
 572     return nc->info->receive(nc, buffer, offset);
 573 }
 574
 575 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 576                                 unsigned flags,
 577                                 const struct iovec *iov,
 578                                 int iovcnt,
 579                                 void *opaque)
 580 {
 581     NetClientState *nc = opaque;
 582     int ret;
 583
 584     if (nc->link_down) {
 585         return iov_size(iov, iovcnt);
 586     }
 587
 588     if (nc->receive_disabled) {
 589         return 0;
 590     }
 591
 592     if (nc->info->receive_iov) {
 593         ret = nc->info->receive_iov(nc, iov, iovcnt);
 594     } else {
 595         ret = nc_sendv_compat(nc, iov, iovcnt);
 596     }
 597
 598     if (ret == 0) {
 599         nc->receive_disabled = 1;
 600     }
 601
 602     return ret;
 603 }
 604
 605 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 606                                 const struct iovec *iov, int iovcnt,
 607                                 NetPacketSent *sent_cb)
 608 {
 609     NetQueue *queue;
 610
 611     if (sender->link_down || !sender->peer) {
 612         return iov_size(iov, iovcnt);
 613     }
 614
 615     queue = sender->peer->incoming_queue;
 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(NetClientState *nc, const struct iovec *iov, int iovcnt)
 624 {
 625     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 626 }
 627
 628 NetClientState *qemu_find_netdev(const char *id)
 629 {
 630     NetClientState *nc;
 631
 632     QTAILQ_FOREACH(nc, &net_clients, next) {
 633         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 634             continue;
 635         if (!strcmp(nc->name, id)) {
 636             return nc;
 637         }
 638     }
 639
 640     return NULL;
 641 }
 642
 643 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 644                                  NetClientOptionsKind type, int max)
 645 {
 646     NetClientState *nc;
 647     int ret = 0;
 648
 649     QTAILQ_FOREACH(nc, &net_clients, next) {
 650         if (nc->info->type == type) {
 651             continue;
 652         }
 653         if (!id || !strcmp(nc->name, id)) {
 654             if (ret < max) {
 655                 ncs[ret] = nc;
 656             }
 657             ret++;
 658         }
 659     }
 660
 661     return ret;
 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 || !is_help_option(arg)) {
 679         return 0;
 680     }
 681
 682     fprintf(stderr, "qemu: Supported NIC models: ");
 683     for (i = 0 ; models[i]; i++)
 684         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 685     return 1;
 686 }
 687
 688 void qemu_check_nic_model(NICInfo *nd, const char *model)
 689 {
 690     const char *models[2];
 691
 692     models[0] = model;
 693     models[1] = NULL;
 694
 695     if (qemu_show_nic_models(nd->model, models))
 696         exit(0);
 697     if (qemu_find_nic_model(nd, models, model) < 0)
 698         exit(1);
 699 }
 700
 701 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 702                         const char *default_model)
 703 {
 704     int i;
 705
 706     if (!nd->model)
 707         nd->model = g_strdup(default_model);
 708
 709     for (i = 0 ; models[i]; i++) {
 710         if (strcmp(nd->model, models[i]) == 0)
 711             return i;
 712     }
 713
 714     error_report("Unsupported NIC model: %s", nd->model);
 715     return -1;
 716 }
 717
 718 static int net_init_nic(const NetClientOptions *opts, const char *name,
 719                         NetClientState *peer)
 720 {
 721     int idx;
 722     NICInfo *nd;
 723     const NetLegacyNicOptions *nic;
 724
 725     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 726     nic = opts->nic;
 727
 728     idx = nic_get_free_idx();
 729     if (idx == -1 || nb_nics >= MAX_NICS) {
 730         error_report("Too Many NICs");
 731         return -1;
 732     }
 733
 734     nd = &nd_table[idx];
 735
 736     memset(nd, 0, sizeof(*nd));
 737
 738     if (nic->has_netdev) {
 739         nd->netdev = qemu_find_netdev(nic->netdev);
 740         if (!nd->netdev) {
 741             error_report("netdev '%s' not found", nic->netdev);
 742             return -1;
 743         }
 744     } else {
 745         assert(peer);
 746         nd->netdev = peer;
 747     }
 748     nd->name = g_strdup(name);
 749     if (nic->has_model) {
 750         nd->model = g_strdup(nic->model);
 751     }
 752     if (nic->has_addr) {
 753         nd->devaddr = g_strdup(nic->addr);
 754     }
 755
 756     if (nic->has_macaddr &&
 757         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 758         error_report("invalid syntax for ethernet address");
 759         return -1;
 760     }
 761     if (nic->has_macaddr &&
 762         is_multicast_ether_addr(nd->macaddr.a)) {
 763         error_report("NIC cannot have multicast MAC address (odd 1st byte)");
 764         return -1;
 765     }
 766     qemu_macaddr_default_if_unset(&nd->macaddr);
 767
 768     if (nic->has_vectors) {
 769         if (nic->vectors > 0x7ffffff) {
 770             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 771             return -1;
 772         }
 773         nd->nvectors = nic->vectors;
 774     } else {
 775         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 776     }
 777
 778     nd->used = 1;
 779     nb_nics++;
 780
 781     return idx;
 782 }
 783
 784
 785 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 786     const NetClientOptions *opts,
 787     const char *name,
 788     NetClientState *peer) = {
 789         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 790 #ifdef CONFIG_SLIRP
 791         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 792 #endif
 793         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 794         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 795 #ifdef CONFIG_VDE
 796         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 797 #endif
 798 #ifdef CONFIG_NETMAP
 799         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 800 #endif
 801         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 802 #ifdef CONFIG_NET_BRIDGE
 803         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 804 #endif
 805         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 806 #ifdef CONFIG_VHOST_NET_USED
 807         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 808 #endif
 809 #ifdef CONFIG_L2TPV3
 810         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 811 #endif
 812 };
 813
 814
 815 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 816 {
 817     union {
 818         const Netdev    *netdev;
 819         const NetLegacy *net;
 820     } u;
 821     const NetClientOptions *opts;
 822     const char *name;
 823
 824     if (is_netdev) {
 825         u.netdev = object;
 826         opts = u.netdev->opts;
 827         name = u.netdev->id;
 828
 829         switch (opts->kind) {
 830 #ifdef CONFIG_SLIRP
 831         case NET_CLIENT_OPTIONS_KIND_USER:
 832 #endif
 833         case NET_CLIENT_OPTIONS_KIND_TAP:
 834         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 835 #ifdef CONFIG_VDE
 836         case NET_CLIENT_OPTIONS_KIND_VDE:
 837 #endif
 838 #ifdef CONFIG_NETMAP
 839         case NET_CLIENT_OPTIONS_KIND_NETMAP:
 840 #endif
 841 #ifdef CONFIG_NET_BRIDGE
 842         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 843 #endif
 844         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 845 #ifdef CONFIG_VHOST_NET_USED
 846         case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
 847 #endif
 848 #ifdef CONFIG_L2TPV3
 849         case NET_CLIENT_OPTIONS_KIND_L2TPV3:
 850 #endif
 851             break;
 852
 853         default:
 854             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 855                       "a netdev backend type");
 856             return -1;
 857         }
 858     } else {
 859         u.net = object;
 860         opts = u.net->opts;
 861         /* missing optional values have been initialized to "all bits zero" */
 862         name = u.net->has_id ? u.net->id : u.net->name;
 863     }
 864
 865     if (net_client_init_fun[opts->kind]) {
 866         NetClientState *peer = NULL;
 867
 868         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 869          * parameter. */
 870         if (!is_netdev &&
 871             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 872              !opts->nic->has_netdev)) {
 873             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 874         }
 875
 876         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 877             /* TODO push error reporting into init() methods */
 878             error_set(errp, QERR_DEVICE_INIT_FAILED,
 879                       NetClientOptionsKind_lookup[opts->kind]);
 880             return -1;
 881         }
 882     }
 883     return 0;
 884 }
 885
 886
 887 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 888 {
 889     if (is_netdev) {
 890         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 891     } else {
 892         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 893     }
 894 }
 895
 896
 897 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 898 {
 899     void *object = NULL;
 900     Error *err = NULL;
 901     int ret = -1;
 902
 903     {
 904         OptsVisitor *ov = opts_visitor_new(opts);
 905
 906         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 907         opts_visitor_cleanup(ov);
 908     }
 909
 910     if (!err) {
 911         ret = net_client_init1(object, is_netdev, &err);
 912     }
 913
 914     if (object) {
 915         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 916
 917         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 918         qapi_dealloc_visitor_cleanup(dv);
 919     }
 920
 921     error_propagate(errp, err);
 922     return ret;
 923 }
 924
 925
 926 static int net_host_check_device(const char *device)
 927 {
 928     int i;
 929     for (i = 0; host_net_devices[i]; i++) {
 930         if (!strncmp(host_net_devices[i], device,
 931                      strlen(host_net_devices[i]))) {
 932             return 1;
 933         }
 934     }
 935
 936     return 0;
 937 }
 938
 939 void net_host_device_add(Monitor *mon, const QDict *qdict)
 940 {
 941     const char *device = qdict_get_str(qdict, "device");
 942     const char *opts_str = qdict_get_try_str(qdict, "opts");
 943     Error *local_err = NULL;
 944     QemuOpts *opts;
 945
 946     if (!net_host_check_device(device)) {
 947         monitor_printf(mon, "invalid host network device %s\n", device);
 948         return;
 949     }
 950
 951     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 952     if (!opts) {
 953         return;
 954     }
 955
 956     qemu_opt_set(opts, "type", device);
 957
 958     net_client_init(opts, 0, &local_err);
 959     if (local_err) {
 960         qerror_report_err(local_err);
 961         error_free(local_err);
 962         monitor_printf(mon, "adding host network device %s failed\n", device);
 963     }
 964 }
 965
 966 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 967 {
 968     NetClientState *nc;
 969     int vlan_id = qdict_get_int(qdict, "vlan_id");
 970     const char *device = qdict_get_str(qdict, "device");
 971
 972     nc = net_hub_find_client_by_name(vlan_id, device);
 973     if (!nc) {
 974         error_report("Host network device '%s' on hub '%d' not found",
 975                      device, vlan_id);
 976         return;
 977     }
 978     if (!net_host_check_device(nc->model)) {
 979         error_report("invalid host network device '%s'", device);
 980         return;
 981     }
 982     qemu_del_net_client(nc);
 983 }
 984
 985 void netdev_add(QemuOpts *opts, Error **errp)
 986 {
 987     net_client_init(opts, 1, errp);
 988 }
 989
 990 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 991 {
 992     Error *local_err = NULL;
 993     QemuOptsList *opts_list;
 994     QemuOpts *opts;
 995
 996     opts_list = qemu_find_opts_err("netdev", &local_err);
 997     if (local_err) {
 998         goto exit_err;
 999     }
1000
1001     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1002     if (local_err) {
1003         goto exit_err;
1004     }
1005
1006     netdev_add(opts, &local_err);
1007     if (local_err) {
1008         qemu_opts_del(opts);
1009         goto exit_err;
1010     }
1011
1012     return 0;
1013
1014 exit_err:
1015     qerror_report_err(local_err);
1016     error_free(local_err);
1017     return -1;
1018 }
1019
1020 void qmp_netdev_del(const char *id, Error **errp)
1021 {
1022     NetClientState *nc;
1023     QemuOpts *opts;
1024
1025     nc = qemu_find_netdev(id);
1026     if (!nc) {
1027         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
1028         return;
1029     }
1030
1031     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1032     if (!opts) {
1033         error_setg(errp, "Device '%s' is not a netdev", id);
1034         return;
1035     }
1036
1037     qemu_del_net_client(nc);
1038     qemu_opts_del(opts);
1039 }
1040
1041 void print_net_client(Monitor *mon, NetClientState *nc)
1042 {
1043     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1044                    nc->queue_index,
1045                    NetClientOptionsKind_lookup[nc->info->type],
1046                    nc->info_str);
1047 }
1048
1049 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1050                                       Error **errp)
1051 {
1052     NetClientState *nc;
1053     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1054
1055     QTAILQ_FOREACH(nc, &net_clients, next) {
1056         RxFilterInfoList *entry;
1057         RxFilterInfo *info;
1058
1059         if (has_name && strcmp(nc->name, name) != 0) {
1060             continue;
1061         }
1062
1063         /* only query rx-filter information of NIC */
1064         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1065             if (has_name) {
1066                 error_setg(errp, "net client(%s) isn't a NIC", name);
1067                 return NULL;
1068             }
1069             continue;
1070         }
1071
1072         if (nc->info->query_rx_filter) {
1073             info = nc->info->query_rx_filter(nc);
1074             entry = g_malloc0(sizeof(*entry));
1075             entry->value = info;
1076
1077             if (!filter_list) {
1078                 filter_list = entry;
1079             } else {
1080                 last_entry->next = entry;
1081             }
1082             last_entry = entry;
1083         } else if (has_name) {
1084             error_setg(errp, "net client(%s) doesn't support"
1085                        " rx-filter querying", name);
1086             return NULL;
1087         }
1088
1089         if (has_name) {
1090             break;
1091         }
1092     }
1093
1094     if (filter_list == NULL && has_name) {
1095         error_setg(errp, "invalid net client name: %s", name);
1096     }
1097
1098     return filter_list;
1099 }
1100
1101 void do_info_network(Monitor *mon, const QDict *qdict)
1102 {
1103     NetClientState *nc, *peer;
1104     NetClientOptionsKind type;
1105
1106     net_hub_info(mon);
1107
1108     QTAILQ_FOREACH(nc, &net_clients, next) {
1109         peer = nc->peer;
1110         type = nc->info->type;
1111
1112         /* Skip if already printed in hub info */
1113         if (net_hub_id_for_client(nc, NULL) == 0) {
1114             continue;
1115         }
1116
1117         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1118             print_net_client(mon, nc);
1119         } /* else it's a netdev connected to a NIC, printed with the NIC */
1120         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1121             monitor_printf(mon, " \\ ");
1122             print_net_client(mon, peer);
1123         }
1124     }
1125 }
1126
1127 void qmp_set_link(const char *name, bool up, Error **errp)
1128 {
1129     NetClientState *ncs[MAX_QUEUE_NUM];
1130     NetClientState *nc;
1131     int queues, i;
1132
1133     queues = qemu_find_net_clients_except(name, ncs,
1134                                           NET_CLIENT_OPTIONS_KIND_MAX,
1135                                           MAX_QUEUE_NUM);
1136
1137     if (queues == 0) {
1138         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
1139         return;
1140     }
1141     nc = ncs[0];
1142
1143     for (i = 0; i < queues; i++) {
1144         ncs[i]->link_down = !up;
1145     }
1146
1147     if (nc->info->link_status_changed) {
1148         nc->info->link_status_changed(nc);
1149     }
1150
1151     if (nc->peer) {
1152         /* Change peer link only if the peer is NIC and then notify peer.
1153          * If the peer is a HUBPORT or a backend, we do not change the
1154          * link status.
1155          *
1156          * This behavior is compatible with qemu vlans where there could be
1157          * multiple clients that can still communicate with each other in
1158          * disconnected mode. For now maintain this compatibility.
1159          */
1160         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1161             for (i = 0; i < queues; i++) {
1162                 ncs[i]->peer->link_down = !up;
1163             }
1164         }
1165         if (nc->peer->info->link_status_changed) {
1166             nc->peer->info->link_status_changed(nc->peer);
1167         }
1168     }
1169 }
1170
1171 void net_cleanup(void)
1172 {
1173     NetClientState *nc;
1174
1175     /* We may del multiple entries during qemu_del_net_client(),
1176      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1177      */
1178     while (!QTAILQ_EMPTY(&net_clients)) {
1179         nc = QTAILQ_FIRST(&net_clients);
1180         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1181             qemu_del_nic(qemu_get_nic(nc));
1182         } else {
1183             qemu_del_net_client(nc);
1184         }
1185     }
1186 }
1187
1188 void net_check_clients(void)
1189 {
1190     NetClientState *nc;
1191     int i;
1192
1193     /* Don't warn about the default network setup that you get if
1194      * no command line -net or -netdev options are specified. There
1195      * are two cases that we would otherwise complain about:
1196      * (1) board doesn't support a NIC but the implicit "-net nic"
1197      * requested one
1198      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1199      * sets up a nic that isn't connected to anything.
1200      */
1201     if (default_net) {
1202         return;
1203     }
1204
1205     net_hub_check_clients();
1206
1207     QTAILQ_FOREACH(nc, &net_clients, next) {
1208         if (!nc->peer) {
1209             fprintf(stderr, "Warning: %s %s has no peer\n",
1210                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1211                     "nic" : "netdev", nc->name);
1212         }
1213     }
1214
1215     /* Check that all NICs requested via -net nic actually got created.
1216      * NICs created via -device don't need to be checked here because
1217      * they are always instantiated.
1218      */
1219     for (i = 0; i < MAX_NICS; i++) {
1220         NICInfo *nd = &nd_table[i];
1221         if (nd->used && !nd->instantiated) {
1222             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1223                     "was not created (not supported by this machine?)\n",
1224                     nd->name ? nd->name : "anonymous",
1225                     nd->model ? nd->model : "unspecified");
1226         }
1227     }
1228 }
1229
1230 static int net_init_client(QemuOpts *opts, void *dummy)
1231 {
1232     Error *local_err = NULL;
1233
1234     net_client_init(opts, 0, &local_err);
1235     if (local_err) {
1236         qerror_report_err(local_err);
1237         error_free(local_err);
1238         return -1;
1239     }
1240
1241     return 0;
1242 }
1243
1244 static int net_init_netdev(QemuOpts *opts, void *dummy)
1245 {
1246     Error *local_err = NULL;
1247     int ret;
1248
1249     ret = net_client_init(opts, 1, &local_err);
1250     if (local_err) {
1251         qerror_report_err(local_err);
1252         error_free(local_err);
1253         return -1;
1254     }
1255
1256     return ret;
1257 }
1258
1259 int net_init_clients(void)
1260 {
1261     QemuOptsList *net = qemu_find_opts("net");
1262
1263     if (default_net) {
1264         /* if no clients, we use a default config */
1265         qemu_opts_set(net, NULL, "type", "nic");
1266 #ifdef CONFIG_SLIRP
1267         qemu_opts_set(net, NULL, "type", "user");
1268 #endif
1269     }
1270
1271     QTAILQ_INIT(&net_clients);
1272
1273     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1274         return -1;
1275
1276     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1277         return -1;
1278     }
1279
1280     return 0;
1281 }
1282
1283 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1284 {
1285 #if defined(CONFIG_SLIRP)
1286     int ret;
1287     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1288         return ret;
1289     }
1290 #endif
1291
1292     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1293         return -1;
1294     }
1295
1296     default_net = 0;
1297     return 0;
1298 }
1299
1300 /* From FreeBSD */
1301 /* XXX: optimize */
1302 unsigned compute_mcast_idx(const uint8_t *ep)
1303 {
1304     uint32_t crc;
1305     int carry, i, j;
1306     uint8_t b;
1307
1308     crc = 0xffffffff;
1309     for (i = 0; i < 6; i++) {
1310         b = *ep++;
1311         for (j = 0; j < 8; j++) {
1312             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1313             crc <<= 1;
1314             b >>= 1;
1315             if (carry) {
1316                 crc = ((crc ^ POLYNOMIAL) | carry);
1317             }
1318         }
1319     }
1320     return crc >> 26;
1321 }
1322
1323 QemuOptsList qemu_netdev_opts = {
1324     .name = "netdev",
1325     .implied_opt_name = "type",
1326     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1327     .desc = {
1328         /*
1329          * no elements => accept any params
1330          * validation will happen later
1331          */
1332         { /* end of list */ }
1333     },
1334 };
1335
1336 QemuOptsList qemu_net_opts = {
1337     .name = "net",
1338     .implied_opt_name = "type",
1339     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1340     .desc = {
1341         /*
1342          * no elements => accept any params
1343          * validation will happen later
1344          */
1345         { /* end of list */ }
1346     },
1347 };