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 "qemu/osdep.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/help_option.h"
  36 #include "qapi/qmp/qerror.h"
  37 #include "qemu/error-report.h"
  38 #include "qemu/sockets.h"
  39 #include "qemu/cutils.h"
  40 #include "qemu/config-file.h"
  41 #include "qmp-commands.h"
  42 #include "hw/qdev.h"
  43 #include "qemu/iov.h"
  44 #include "qemu/main-loop.h"
  45 #include "qapi-visit.h"
  46 #include "qapi/opts-visitor.h"
  47 #include "sysemu/sysemu.h"
  48 #include "net/filter.h"
  49 #include "qapi/string-output-visitor.h"
  50
  51 /* Net bridge is currently not supported for W32. */
  52 #if !defined(_WIN32)
  53 # define CONFIG_NET_BRIDGE
  54 #endif
  55
  56 static VMChangeStateEntry *net_change_state_entry;
  57 static QTAILQ_HEAD(, NetClientState) net_clients;
  58
  59 const char *host_net_devices[] = {
  60     "tap",
  61     "socket",
  62     "dump",
  63 #ifdef CONFIG_NET_BRIDGE
  64     "bridge",
  65 #endif
  66 #ifdef CONFIG_NETMAP
  67     "netmap",
  68 #endif
  69 #ifdef CONFIG_SLIRP
  70     "user",
  71 #endif
  72 #ifdef CONFIG_VDE
  73     "vde",
  74 #endif
  75     "vhost-user",
  76     NULL,
  77 };
  78
  79 int default_net = 1;
  80
  81 /***********************************************************/
  82 /* network device redirectors */
  83
  84 #if defined(DEBUG_NET)
  85 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  86 {
  87     int len, i, j, c;
  88
  89     for(i=0;i<size;i+=16) {
  90         len = size - i;
  91         if (len > 16)
  92             len = 16;
  93         fprintf(f, "%08x ", i);
  94         for(j=0;j<16;j++) {
  95             if (j < len)
  96                 fprintf(f, " %02x", buf[i+j]);
  97             else
  98                 fprintf(f, "   ");
  99         }
 100         fprintf(f, " ");
 101         for(j=0;j<len;j++) {
 102             c = buf[i+j];
 103             if (c < ' ' || c > '~')
 104                 c = '.';
 105             fprintf(f, "%c", c);
 106         }
 107         fprintf(f, "\n");
 108     }
 109 }
 110 #endif
 111
 112 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
 113 {
 114     const char *p, *p1;
 115     int len;
 116     p = *pp;
 117     p1 = strchr(p, sep);
 118     if (!p1)
 119         return -1;
 120     len = p1 - p;
 121     p1++;
 122     if (buf_size > 0) {
 123         if (len > buf_size - 1)
 124             len = buf_size - 1;
 125         memcpy(buf, p, len);
 126         buf[len] = '\0';
 127     }
 128     *pp = p1;
 129     return 0;
 130 }
 131
 132 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 133 {
 134     char buf[512];
 135     struct hostent *he;
 136     const char *p, *r;
 137     int port;
 138
 139     p = str;
 140     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 141         return -1;
 142     saddr->sin_family = AF_INET;
 143     if (buf[0] == '\0') {
 144         saddr->sin_addr.s_addr = 0;
 145     } else {
 146         if (qemu_isdigit(buf[0])) {
 147             if (!inet_aton(buf, &saddr->sin_addr))
 148                 return -1;
 149         } else {
 150             if ((he = gethostbyname(buf)) == NULL)
 151                 return - 1;
 152             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 153         }
 154     }
 155     port = strtol(p, (char **)&r, 0);
 156     if (r == p)
 157         return -1;
 158     saddr->sin_port = htons(port);
 159     return 0;
 160 }
 161
 162 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 163 {
 164     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 165                            macaddr[0], macaddr[1], macaddr[2],
 166                            macaddr[3], macaddr[4], macaddr[5]);
 167 }
 168
 169 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 170 {
 171     snprintf(nc->info_str, sizeof(nc->info_str),
 172              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 173              nc->model,
 174              macaddr[0], macaddr[1], macaddr[2],
 175              macaddr[3], macaddr[4], macaddr[5]);
 176 }
 177
 178 static int mac_table[256] = {0};
 179
 180 static void qemu_macaddr_set_used(MACAddr *macaddr)
 181 {
 182     int index;
 183
 184     for (index = 0x56; index < 0xFF; index++) {
 185         if (macaddr->a[5] == index) {
 186             mac_table[index]++;
 187         }
 188     }
 189 }
 190
 191 static void qemu_macaddr_set_free(MACAddr *macaddr)
 192 {
 193     int index;
 194     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 195
 196     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 197         return;
 198     }
 199     for (index = 0x56; index < 0xFF; index++) {
 200         if (macaddr->a[5] == index) {
 201             mac_table[index]--;
 202         }
 203     }
 204 }
 205
 206 static int qemu_macaddr_get_free(void)
 207 {
 208     int index;
 209
 210     for (index = 0x56; index < 0xFF; index++) {
 211         if (mac_table[index] == 0) {
 212             return index;
 213         }
 214     }
 215
 216     return -1;
 217 }
 218
 219 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 220 {
 221     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 222     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 223
 224     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 225         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 226             return;
 227         } else {
 228             qemu_macaddr_set_used(macaddr);
 229             return;
 230         }
 231     }
 232
 233     macaddr->a[0] = 0x52;
 234     macaddr->a[1] = 0x54;
 235     macaddr->a[2] = 0x00;
 236     macaddr->a[3] = 0x12;
 237     macaddr->a[4] = 0x34;
 238     macaddr->a[5] = qemu_macaddr_get_free();
 239     qemu_macaddr_set_used(macaddr);
 240 }
 241
 242 /**
 243  * Generate a name for net client
 244  *
 245  * Only net clients created with the legacy -net option and NICs need this.
 246  */
 247 static char *assign_name(NetClientState *nc1, const char *model)
 248 {
 249     NetClientState *nc;
 250     int id = 0;
 251
 252     QTAILQ_FOREACH(nc, &net_clients, next) {
 253         if (nc == nc1) {
 254             continue;
 255         }
 256         if (strcmp(nc->model, model) == 0) {
 257             id++;
 258         }
 259     }
 260
 261     return g_strdup_printf("%s.%d", model, id);
 262 }
 263
 264 static void qemu_net_client_destructor(NetClientState *nc)
 265 {
 266     g_free(nc);
 267 }
 268
 269 static void qemu_net_client_setup(NetClientState *nc,
 270                                   NetClientInfo *info,
 271                                   NetClientState *peer,
 272                                   const char *model,
 273                                   const char *name,
 274                                   NetClientDestructor *destructor)
 275 {
 276     nc->info = info;
 277     nc->model = g_strdup(model);
 278     if (name) {
 279         nc->name = g_strdup(name);
 280     } else {
 281         nc->name = assign_name(nc, model);
 282     }
 283
 284     if (peer) {
 285         assert(!peer->peer);
 286         nc->peer = peer;
 287         peer->peer = nc;
 288     }
 289     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 290
 291     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 292     nc->destructor = destructor;
 293     QTAILQ_INIT(&nc->filters);
 294 }
 295
 296 NetClientState *qemu_new_net_client(NetClientInfo *info,
 297                                     NetClientState *peer,
 298                                     const char *model,
 299                                     const char *name)
 300 {
 301     NetClientState *nc;
 302
 303     assert(info->size >= sizeof(NetClientState));
 304
 305     nc = g_malloc0(info->size);
 306     qemu_net_client_setup(nc, info, peer, model, name,
 307                           qemu_net_client_destructor);
 308
 309     return nc;
 310 }
 311
 312 NICState *qemu_new_nic(NetClientInfo *info,
 313                        NICConf *conf,
 314                        const char *model,
 315                        const char *name,
 316                        void *opaque)
 317 {
 318     NetClientState **peers = conf->peers.ncs;
 319     NICState *nic;
 320     int i, queues = MAX(1, conf->peers.queues);
 321
 322     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 323     assert(info->size >= sizeof(NICState));
 324
 325     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 326     nic->ncs = (void *)nic + info->size;
 327     nic->conf = conf;
 328     nic->opaque = opaque;
 329
 330     for (i = 0; i < queues; i++) {
 331         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 332                               NULL);
 333         nic->ncs[i].queue_index = i;
 334     }
 335
 336     return nic;
 337 }
 338
 339 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 340 {
 341     return nic->ncs + queue_index;
 342 }
 343
 344 NetClientState *qemu_get_queue(NICState *nic)
 345 {
 346     return qemu_get_subqueue(nic, 0);
 347 }
 348
 349 NICState *qemu_get_nic(NetClientState *nc)
 350 {
 351     NetClientState *nc0 = nc - nc->queue_index;
 352
 353     return (NICState *)((void *)nc0 - nc->info->size);
 354 }
 355
 356 void *qemu_get_nic_opaque(NetClientState *nc)
 357 {
 358     NICState *nic = qemu_get_nic(nc);
 359
 360     return nic->opaque;
 361 }
 362
 363 static void qemu_cleanup_net_client(NetClientState *nc)
 364 {
 365     QTAILQ_REMOVE(&net_clients, nc, next);
 366
 367     if (nc->info->cleanup) {
 368         nc->info->cleanup(nc);
 369     }
 370 }
 371
 372 static void qemu_free_net_client(NetClientState *nc)
 373 {
 374     if (nc->incoming_queue) {
 375         qemu_del_net_queue(nc->incoming_queue);
 376     }
 377     if (nc->peer) {
 378         nc->peer->peer = NULL;
 379     }
 380     g_free(nc->name);
 381     g_free(nc->model);
 382     if (nc->destructor) {
 383         nc->destructor(nc);
 384     }
 385 }
 386
 387 void qemu_del_net_client(NetClientState *nc)
 388 {
 389     NetClientState *ncs[MAX_QUEUE_NUM];
 390     int queues, i;
 391     NetFilterState *nf, *next;
 392
 393     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 394
 395     /* If the NetClientState belongs to a multiqueue backend, we will change all
 396      * other NetClientStates also.
 397      */
 398     queues = qemu_find_net_clients_except(nc->name, ncs,
 399                                           NET_CLIENT_OPTIONS_KIND_NIC,
 400                                           MAX_QUEUE_NUM);
 401     assert(queues != 0);
 402
 403     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 404         object_unparent(OBJECT(nf));
 405     }
 406
 407     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 408     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 409         NICState *nic = qemu_get_nic(nc->peer);
 410         if (nic->peer_deleted) {
 411             return;
 412         }
 413         nic->peer_deleted = true;
 414
 415         for (i = 0; i < queues; i++) {
 416             ncs[i]->peer->link_down = true;
 417         }
 418
 419         if (nc->peer->info->link_status_changed) {
 420             nc->peer->info->link_status_changed(nc->peer);
 421         }
 422
 423         for (i = 0; i < queues; i++) {
 424             qemu_cleanup_net_client(ncs[i]);
 425         }
 426
 427         return;
 428     }
 429
 430     for (i = 0; i < queues; i++) {
 431         qemu_cleanup_net_client(ncs[i]);
 432         qemu_free_net_client(ncs[i]);
 433     }
 434 }
 435
 436 void qemu_del_nic(NICState *nic)
 437 {
 438     int i, queues = MAX(nic->conf->peers.queues, 1);
 439
 440     qemu_macaddr_set_free(&nic->conf->macaddr);
 441
 442     /* If this is a peer NIC and peer has already been deleted, free it now. */
 443     if (nic->peer_deleted) {
 444         for (i = 0; i < queues; i++) {
 445             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 446         }
 447     }
 448
 449     for (i = queues - 1; i >= 0; i--) {
 450         NetClientState *nc = qemu_get_subqueue(nic, i);
 451
 452         qemu_cleanup_net_client(nc);
 453         qemu_free_net_client(nc);
 454     }
 455
 456     g_free(nic);
 457 }
 458
 459 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 460 {
 461     NetClientState *nc;
 462
 463     QTAILQ_FOREACH(nc, &net_clients, next) {
 464         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 465             if (nc->queue_index == 0) {
 466                 func(qemu_get_nic(nc), opaque);
 467             }
 468         }
 469     }
 470 }
 471
 472 bool qemu_has_ufo(NetClientState *nc)
 473 {
 474     if (!nc || !nc->info->has_ufo) {
 475         return false;
 476     }
 477
 478     return nc->info->has_ufo(nc);
 479 }
 480
 481 bool qemu_has_vnet_hdr(NetClientState *nc)
 482 {
 483     if (!nc || !nc->info->has_vnet_hdr) {
 484         return false;
 485     }
 486
 487     return nc->info->has_vnet_hdr(nc);
 488 }
 489
 490 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 491 {
 492     if (!nc || !nc->info->has_vnet_hdr_len) {
 493         return false;
 494     }
 495
 496     return nc->info->has_vnet_hdr_len(nc, len);
 497 }
 498
 499 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 500 {
 501     if (!nc || !nc->info->using_vnet_hdr) {
 502         return;
 503     }
 504
 505     nc->info->using_vnet_hdr(nc, enable);
 506 }
 507
 508 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 509                           int ecn, int ufo)
 510 {
 511     if (!nc || !nc->info->set_offload) {
 512         return;
 513     }
 514
 515     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 516 }
 517
 518 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 519 {
 520     if (!nc || !nc->info->set_vnet_hdr_len) {
 521         return;
 522     }
 523
 524     nc->info->set_vnet_hdr_len(nc, len);
 525 }
 526
 527 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 528 {
 529 #ifdef HOST_WORDS_BIGENDIAN
 530     if (!nc || !nc->info->set_vnet_le) {
 531         return -ENOSYS;
 532     }
 533
 534     return nc->info->set_vnet_le(nc, is_le);
 535 #else
 536     return 0;
 537 #endif
 538 }
 539
 540 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 541 {
 542 #ifdef HOST_WORDS_BIGENDIAN
 543     return 0;
 544 #else
 545     if (!nc || !nc->info->set_vnet_be) {
 546         return -ENOSYS;
 547     }
 548
 549     return nc->info->set_vnet_be(nc, is_be);
 550 #endif
 551 }
 552
 553 int qemu_can_send_packet(NetClientState *sender)
 554 {
 555     int vm_running = runstate_is_running();
 556
 557     if (!vm_running) {
 558         return 0;
 559     }
 560
 561     if (!sender->peer) {
 562         return 1;
 563     }
 564
 565     if (sender->peer->receive_disabled) {
 566         return 0;
 567     } else if (sender->peer->info->can_receive &&
 568                !sender->peer->info->can_receive(sender->peer)) {
 569         return 0;
 570     }
 571     return 1;
 572 }
 573
 574 static ssize_t filter_receive_iov(NetClientState *nc,
 575                                   NetFilterDirection direction,
 576                                   NetClientState *sender,
 577                                   unsigned flags,
 578                                   const struct iovec *iov,
 579                                   int iovcnt,
 580                                   NetPacketSent *sent_cb)
 581 {
 582     ssize_t ret = 0;
 583     NetFilterState *nf = NULL;
 584
 585     if (direction == NET_FILTER_DIRECTION_TX) {
 586         QTAILQ_FOREACH(nf, &nc->filters, next) {
 587             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 588                                          iovcnt, sent_cb);
 589             if (ret) {
 590                 return ret;
 591             }
 592         }
 593     } else {
 594         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
 595             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 596                                          iovcnt, sent_cb);
 597             if (ret) {
 598                 return ret;
 599             }
 600         }
 601     }
 602
 603     return ret;
 604 }
 605
 606 static ssize_t filter_receive(NetClientState *nc,
 607                               NetFilterDirection direction,
 608                               NetClientState *sender,
 609                               unsigned flags,
 610                               const uint8_t *data,
 611                               size_t size,
 612                               NetPacketSent *sent_cb)
 613 {
 614     struct iovec iov = {
 615         .iov_base = (void *)data,
 616         .iov_len = size
 617     };
 618
 619     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 620 }
 621
 622 void qemu_purge_queued_packets(NetClientState *nc)
 623 {
 624     if (!nc->peer) {
 625         return;
 626     }
 627
 628     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 629 }
 630
 631 static
 632 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 633 {
 634     nc->receive_disabled = 0;
 635
 636     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 637         if (net_hub_flush(nc->peer)) {
 638             qemu_notify_event();
 639         }
 640     }
 641     if (qemu_net_queue_flush(nc->incoming_queue)) {
 642         /* We emptied the queue successfully, signal to the IO thread to repoll
 643          * the file descriptor (for tap, for example).
 644          */
 645         qemu_notify_event();
 646     } else if (purge) {
 647         /* Unable to empty the queue, purge remaining packets */
 648         qemu_net_queue_purge(nc->incoming_queue, nc);
 649     }
 650 }
 651
 652 void qemu_flush_queued_packets(NetClientState *nc)
 653 {
 654     qemu_flush_or_purge_queued_packets(nc, false);
 655 }
 656
 657 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 658                                                  unsigned flags,
 659                                                  const uint8_t *buf, int size,
 660                                                  NetPacketSent *sent_cb)
 661 {
 662     NetQueue *queue;
 663     int ret;
 664
 665 #ifdef DEBUG_NET
 666     printf("qemu_send_packet_async:\n");
 667     hex_dump(stdout, buf, size);
 668 #endif
 669
 670     if (sender->link_down || !sender->peer) {
 671         return size;
 672     }
 673
 674     /* Let filters handle the packet first */
 675     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 676                          sender, flags, buf, size, sent_cb);
 677     if (ret) {
 678         return ret;
 679     }
 680
 681     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 682                          sender, flags, buf, size, sent_cb);
 683     if (ret) {
 684         return ret;
 685     }
 686
 687     queue = sender->peer->incoming_queue;
 688
 689     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 690 }
 691
 692 ssize_t qemu_send_packet_async(NetClientState *sender,
 693                                const uint8_t *buf, int size,
 694                                NetPacketSent *sent_cb)
 695 {
 696     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 697                                              buf, size, sent_cb);
 698 }
 699
 700 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 701 {
 702     qemu_send_packet_async(nc, buf, size, NULL);
 703 }
 704
 705 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 706 {
 707     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 708                                              buf, size, NULL);
 709 }
 710
 711 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 712                                int iovcnt, unsigned flags)
 713 {
 714     uint8_t buf[NET_BUFSIZE];
 715     uint8_t *buffer;
 716     size_t offset;
 717
 718     if (iovcnt == 1) {
 719         buffer = iov[0].iov_base;
 720         offset = iov[0].iov_len;
 721     } else {
 722         buffer = buf;
 723         offset = iov_to_buf(iov, iovcnt, 0, buf, sizeof(buf));
 724     }
 725
 726     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 727         return nc->info->receive_raw(nc, buffer, offset);
 728     } else {
 729         return nc->info->receive(nc, buffer, offset);
 730     }
 731 }
 732
 733 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 734                                 unsigned flags,
 735                                 const struct iovec *iov,
 736                                 int iovcnt,
 737                                 void *opaque)
 738 {
 739     NetClientState *nc = opaque;
 740     int ret;
 741
 742     if (nc->link_down) {
 743         return iov_size(iov, iovcnt);
 744     }
 745
 746     if (nc->receive_disabled) {
 747         return 0;
 748     }
 749
 750     if (nc->info->receive_iov) {
 751         ret = nc->info->receive_iov(nc, iov, iovcnt);
 752     } else {
 753         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 754     }
 755
 756     if (ret == 0) {
 757         nc->receive_disabled = 1;
 758     }
 759
 760     return ret;
 761 }
 762
 763 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 764                                 const struct iovec *iov, int iovcnt,
 765                                 NetPacketSent *sent_cb)
 766 {
 767     NetQueue *queue;
 768     int ret;
 769
 770     if (sender->link_down || !sender->peer) {
 771         return iov_size(iov, iovcnt);
 772     }
 773
 774     /* Let filters handle the packet first */
 775     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 776                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 777     if (ret) {
 778         return ret;
 779     }
 780
 781     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 782                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 783     if (ret) {
 784         return ret;
 785     }
 786
 787     queue = sender->peer->incoming_queue;
 788
 789     return qemu_net_queue_send_iov(queue, sender,
 790                                    QEMU_NET_PACKET_FLAG_NONE,
 791                                    iov, iovcnt, sent_cb);
 792 }
 793
 794 ssize_t
 795 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 796 {
 797     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 798 }
 799
 800 NetClientState *qemu_find_netdev(const char *id)
 801 {
 802     NetClientState *nc;
 803
 804     QTAILQ_FOREACH(nc, &net_clients, next) {
 805         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 806             continue;
 807         if (!strcmp(nc->name, id)) {
 808             return nc;
 809         }
 810     }
 811
 812     return NULL;
 813 }
 814
 815 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 816                                  NetClientOptionsKind type, int max)
 817 {
 818     NetClientState *nc;
 819     int ret = 0;
 820
 821     QTAILQ_FOREACH(nc, &net_clients, next) {
 822         if (nc->info->type == type) {
 823             continue;
 824         }
 825         if (!id || !strcmp(nc->name, id)) {
 826             if (ret < max) {
 827                 ncs[ret] = nc;
 828             }
 829             ret++;
 830         }
 831     }
 832
 833     return ret;
 834 }
 835
 836 static int nic_get_free_idx(void)
 837 {
 838     int index;
 839
 840     for (index = 0; index < MAX_NICS; index++)
 841         if (!nd_table[index].used)
 842             return index;
 843     return -1;
 844 }
 845
 846 int qemu_show_nic_models(const char *arg, const char *const *models)
 847 {
 848     int i;
 849
 850     if (!arg || !is_help_option(arg)) {
 851         return 0;
 852     }
 853
 854     fprintf(stderr, "qemu: Supported NIC models: ");
 855     for (i = 0 ; models[i]; i++)
 856         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 857     return 1;
 858 }
 859
 860 void qemu_check_nic_model(NICInfo *nd, const char *model)
 861 {
 862     const char *models[2];
 863
 864     models[0] = model;
 865     models[1] = NULL;
 866
 867     if (qemu_show_nic_models(nd->model, models))
 868         exit(0);
 869     if (qemu_find_nic_model(nd, models, model) < 0)
 870         exit(1);
 871 }
 872
 873 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 874                         const char *default_model)
 875 {
 876     int i;
 877
 878     if (!nd->model)
 879         nd->model = g_strdup(default_model);
 880
 881     for (i = 0 ; models[i]; i++) {
 882         if (strcmp(nd->model, models[i]) == 0)
 883             return i;
 884     }
 885
 886     error_report("Unsupported NIC model: %s", nd->model);
 887     return -1;
 888 }
 889
 890 static int net_init_nic(const NetClientOptions *opts, const char *name,
 891                         NetClientState *peer, Error **errp)
 892 {
 893     int idx;
 894     NICInfo *nd;
 895     const NetLegacyNicOptions *nic;
 896
 897     assert(opts->type == NET_CLIENT_OPTIONS_KIND_NIC);
 898     nic = opts->u.nic.data;
 899
 900     idx = nic_get_free_idx();
 901     if (idx == -1 || nb_nics >= MAX_NICS) {
 902         error_setg(errp, "too many NICs");
 903         return -1;
 904     }
 905
 906     nd = &nd_table[idx];
 907
 908     memset(nd, 0, sizeof(*nd));
 909
 910     if (nic->has_netdev) {
 911         nd->netdev = qemu_find_netdev(nic->netdev);
 912         if (!nd->netdev) {
 913             error_setg(errp, "netdev '%s' not found", nic->netdev);
 914             return -1;
 915         }
 916     } else {
 917         assert(peer);
 918         nd->netdev = peer;
 919     }
 920     nd->name = g_strdup(name);
 921     if (nic->has_model) {
 922         nd->model = g_strdup(nic->model);
 923     }
 924     if (nic->has_addr) {
 925         nd->devaddr = g_strdup(nic->addr);
 926     }
 927
 928     if (nic->has_macaddr &&
 929         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 930         error_setg(errp, "invalid syntax for ethernet address");
 931         return -1;
 932     }
 933     if (nic->has_macaddr &&
 934         is_multicast_ether_addr(nd->macaddr.a)) {
 935         error_setg(errp,
 936                    "NIC cannot have multicast MAC address (odd 1st byte)");
 937         return -1;
 938     }
 939     qemu_macaddr_default_if_unset(&nd->macaddr);
 940
 941     if (nic->has_vectors) {
 942         if (nic->vectors > 0x7ffffff) {
 943             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 944             return -1;
 945         }
 946         nd->nvectors = nic->vectors;
 947     } else {
 948         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 949     }
 950
 951     nd->used = 1;
 952     nb_nics++;
 953
 954     return idx;
 955 }
 956
 957
 958 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND__MAX])(
 959     const NetClientOptions *opts,
 960     const char *name,
 961     NetClientState *peer, Error **errp) = {
 962         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 963 #ifdef CONFIG_SLIRP
 964         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 965 #endif
 966         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 967         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 968 #ifdef CONFIG_VDE
 969         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 970 #endif
 971 #ifdef CONFIG_NETMAP
 972         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 973 #endif
 974         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 975 #ifdef CONFIG_NET_BRIDGE
 976         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 977 #endif
 978         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 979 #ifdef CONFIG_VHOST_NET_USED
 980         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 981 #endif
 982 #ifdef CONFIG_L2TPV3
 983         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 984 #endif
 985 };
 986
 987
 988 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 989 {
 990     const NetClientOptions *opts;
 991     const char *name;
 992     NetClientState *peer = NULL;
 993
 994     if (is_netdev) {
 995         const Netdev *netdev = object;
 996         opts = netdev->opts;
 997         name = netdev->id;
 998
 999         if (opts->type == NET_CLIENT_OPTIONS_KIND_DUMP ||
1000             opts->type == NET_CLIENT_OPTIONS_KIND_NIC ||
1001             !net_client_init_fun[opts->type]) {
1002             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1003                        "a netdev backend type");
1004             return -1;
1005         }
1006     } else {
1007         const NetLegacy *net = object;
1008         opts = net->opts;
1009         /* missing optional values have been initialized to "all bits zero" */
1010         name = net->has_id ? net->id : net->name;
1011
1012         if (opts->type == NET_CLIENT_OPTIONS_KIND_NONE) {
1013             return 0; /* nothing to do */
1014         }
1015         if (opts->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
1016             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1017                        "a net type");
1018             return -1;
1019         }
1020
1021         if (!net_client_init_fun[opts->type]) {
1022             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1023                        "a net backend type (maybe it is not compiled "
1024                        "into this binary)");
1025             return -1;
1026         }
1027
1028         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1029         if (opts->type != NET_CLIENT_OPTIONS_KIND_NIC ||
1030             !opts->u.nic.data->has_netdev) {
1031             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1032         }
1033     }
1034
1035     if (net_client_init_fun[opts->type](opts, name, peer, errp) < 0) {
1036         /* FIXME drop when all init functions store an Error */
1037         if (errp && !*errp) {
1038             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1039                        NetClientOptionsKind_lookup[opts->type]);
1040         }
1041         return -1;
1042     }
1043     return 0;
1044 }
1045
1046
1047 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
1048 {
1049     void *object = NULL;
1050     Error *err = NULL;
1051     int ret = -1;
1052     OptsVisitor *ov = opts_visitor_new(opts);
1053     Visitor *v = opts_get_visitor(ov);
1054
1055     {
1056         /* Parse convenience option format ip6-net=fec0::0[/64] */
1057         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1058
1059         if (ip6_net) {
1060             char buf[strlen(ip6_net) + 1];
1061
1062             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1063                 /* Default 64bit prefix length.  */
1064                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1065                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1066             } else {
1067                 /* User-specified prefix length.  */
1068                 unsigned long len;
1069                 int err;
1070
1071                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1072                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1073
1074                 if (err) {
1075                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1076                               "ipv6-prefix", "a number");
1077                 } else {
1078                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1079                                         &error_abort);
1080                 }
1081             }
1082             qemu_opt_unset(opts, "ipv6-net");
1083         }
1084     }
1085
1086     if (is_netdev) {
1087         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1088     } else {
1089         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1090     }
1091
1092     if (!err) {
1093         ret = net_client_init1(object, is_netdev, &err);
1094     }
1095
1096     if (is_netdev) {
1097         qapi_free_Netdev(object);
1098     } else {
1099         qapi_free_NetLegacy(object);
1100     }
1101
1102     error_propagate(errp, err);
1103     return ret;
1104 }
1105
1106
1107 static int net_host_check_device(const char *device)
1108 {
1109     int i;
1110     for (i = 0; host_net_devices[i]; i++) {
1111         if (!strncmp(host_net_devices[i], device,
1112                      strlen(host_net_devices[i]))) {
1113             return 1;
1114         }
1115     }
1116
1117     return 0;
1118 }
1119
1120 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1121 {
1122     const char *device = qdict_get_str(qdict, "device");
1123     const char *opts_str = qdict_get_try_str(qdict, "opts");
1124     Error *local_err = NULL;
1125     QemuOpts *opts;
1126
1127     if (!net_host_check_device(device)) {
1128         monitor_printf(mon, "invalid host network device %s\n", device);
1129         return;
1130     }
1131
1132     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1133                                    opts_str ? opts_str : "", false);
1134     if (!opts) {
1135         return;
1136     }
1137
1138     qemu_opt_set(opts, "type", device, &error_abort);
1139
1140     net_client_init(opts, 0, &local_err);
1141     if (local_err) {
1142         error_report_err(local_err);
1143         monitor_printf(mon, "adding host network device %s failed\n", device);
1144     }
1145 }
1146
1147 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1148 {
1149     NetClientState *nc;
1150     int vlan_id = qdict_get_int(qdict, "vlan_id");
1151     const char *device = qdict_get_str(qdict, "device");
1152
1153     nc = net_hub_find_client_by_name(vlan_id, device);
1154     if (!nc) {
1155         error_report("Host network device '%s' on hub '%d' not found",
1156                      device, vlan_id);
1157         return;
1158     }
1159     if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1160         error_report("invalid host network device '%s'", device);
1161         return;
1162     }
1163
1164     qemu_del_net_client(nc->peer);
1165     qemu_del_net_client(nc);
1166 }
1167
1168 void netdev_add(QemuOpts *opts, Error **errp)
1169 {
1170     net_client_init(opts, 1, errp);
1171 }
1172
1173 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1174 {
1175     Error *local_err = NULL;
1176     QemuOptsList *opts_list;
1177     QemuOpts *opts;
1178
1179     opts_list = qemu_find_opts_err("netdev", &local_err);
1180     if (local_err) {
1181         goto out;
1182     }
1183
1184     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1185     if (local_err) {
1186         goto out;
1187     }
1188
1189     netdev_add(opts, &local_err);
1190     if (local_err) {
1191         qemu_opts_del(opts);
1192         goto out;
1193     }
1194
1195 out:
1196     error_propagate(errp, local_err);
1197 }
1198
1199 void qmp_netdev_del(const char *id, Error **errp)
1200 {
1201     NetClientState *nc;
1202     QemuOpts *opts;
1203
1204     nc = qemu_find_netdev(id);
1205     if (!nc) {
1206         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1207                   "Device '%s' not found", id);
1208         return;
1209     }
1210
1211     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1212     if (!opts) {
1213         error_setg(errp, "Device '%s' is not a netdev", id);
1214         return;
1215     }
1216
1217     qemu_del_net_client(nc);
1218     qemu_opts_del(opts);
1219 }
1220
1221 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1222 {
1223     char *str;
1224     ObjectProperty *prop;
1225     ObjectPropertyIterator iter;
1226     StringOutputVisitor *ov;
1227
1228     /* generate info str */
1229     object_property_iter_init(&iter, OBJECT(nf));
1230     while ((prop = object_property_iter_next(&iter))) {
1231         if (!strcmp(prop->name, "type")) {
1232             continue;
1233         }
1234         ov = string_output_visitor_new(false);
1235         object_property_get(OBJECT(nf), string_output_get_visitor(ov),
1236                             prop->name, NULL);
1237         str = string_output_get_string(ov);
1238         string_output_visitor_cleanup(ov);
1239         monitor_printf(mon, ",%s=%s", prop->name, str);
1240         g_free(str);
1241     }
1242     monitor_printf(mon, "\n");
1243 }
1244
1245 void print_net_client(Monitor *mon, NetClientState *nc)
1246 {
1247     NetFilterState *nf;
1248
1249     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1250                    nc->queue_index,
1251                    NetClientOptionsKind_lookup[nc->info->type],
1252                    nc->info_str);
1253     if (!QTAILQ_EMPTY(&nc->filters)) {
1254         monitor_printf(mon, "filters:\n");
1255     }
1256     QTAILQ_FOREACH(nf, &nc->filters, next) {
1257         char *path = object_get_canonical_path_component(OBJECT(nf));
1258
1259         monitor_printf(mon, "  - %s: type=%s", path,
1260                        object_get_typename(OBJECT(nf)));
1261         netfilter_print_info(mon, nf);
1262         g_free(path);
1263     }
1264 }
1265
1266 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1267                                       Error **errp)
1268 {
1269     NetClientState *nc;
1270     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1271
1272     QTAILQ_FOREACH(nc, &net_clients, next) {
1273         RxFilterInfoList *entry;
1274         RxFilterInfo *info;
1275
1276         if (has_name && strcmp(nc->name, name) != 0) {
1277             continue;
1278         }
1279
1280         /* only query rx-filter information of NIC */
1281         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1282             if (has_name) {
1283                 error_setg(errp, "net client(%s) isn't a NIC", name);
1284                 return NULL;
1285             }
1286             continue;
1287         }
1288
1289         /* only query information on queue 0 since the info is per nic,
1290          * not per queue
1291          */
1292         if (nc->queue_index != 0)
1293             continue;
1294
1295         if (nc->info->query_rx_filter) {
1296             info = nc->info->query_rx_filter(nc);
1297             entry = g_malloc0(sizeof(*entry));
1298             entry->value = info;
1299
1300             if (!filter_list) {
1301                 filter_list = entry;
1302             } else {
1303                 last_entry->next = entry;
1304             }
1305             last_entry = entry;
1306         } else if (has_name) {
1307             error_setg(errp, "net client(%s) doesn't support"
1308                        " rx-filter querying", name);
1309             return NULL;
1310         }
1311
1312         if (has_name) {
1313             break;
1314         }
1315     }
1316
1317     if (filter_list == NULL && has_name) {
1318         error_setg(errp, "invalid net client name: %s", name);
1319     }
1320
1321     return filter_list;
1322 }
1323
1324 void hmp_info_network(Monitor *mon, const QDict *qdict)
1325 {
1326     NetClientState *nc, *peer;
1327     NetClientOptionsKind type;
1328
1329     net_hub_info(mon);
1330
1331     QTAILQ_FOREACH(nc, &net_clients, next) {
1332         peer = nc->peer;
1333         type = nc->info->type;
1334
1335         /* Skip if already printed in hub info */
1336         if (net_hub_id_for_client(nc, NULL) == 0) {
1337             continue;
1338         }
1339
1340         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1341             print_net_client(mon, nc);
1342         } /* else it's a netdev connected to a NIC, printed with the NIC */
1343         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1344             monitor_printf(mon, " \\ ");
1345             print_net_client(mon, peer);
1346         }
1347     }
1348 }
1349
1350 void qmp_set_link(const char *name, bool up, Error **errp)
1351 {
1352     NetClientState *ncs[MAX_QUEUE_NUM];
1353     NetClientState *nc;
1354     int queues, i;
1355
1356     queues = qemu_find_net_clients_except(name, ncs,
1357                                           NET_CLIENT_OPTIONS_KIND__MAX,
1358                                           MAX_QUEUE_NUM);
1359
1360     if (queues == 0) {
1361         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1362                   "Device '%s' not found", name);
1363         return;
1364     }
1365     nc = ncs[0];
1366
1367     for (i = 0; i < queues; i++) {
1368         ncs[i]->link_down = !up;
1369     }
1370
1371     if (nc->info->link_status_changed) {
1372         nc->info->link_status_changed(nc);
1373     }
1374
1375     if (nc->peer) {
1376         /* Change peer link only if the peer is NIC and then notify peer.
1377          * If the peer is a HUBPORT or a backend, we do not change the
1378          * link status.
1379          *
1380          * This behavior is compatible with qemu vlans where there could be
1381          * multiple clients that can still communicate with each other in
1382          * disconnected mode. For now maintain this compatibility.
1383          */
1384         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1385             for (i = 0; i < queues; i++) {
1386                 ncs[i]->peer->link_down = !up;
1387             }
1388         }
1389         if (nc->peer->info->link_status_changed) {
1390             nc->peer->info->link_status_changed(nc->peer);
1391         }
1392     }
1393 }
1394
1395 static void net_vm_change_state_handler(void *opaque, int running,
1396                                         RunState state)
1397 {
1398     NetClientState *nc;
1399     NetClientState *tmp;
1400
1401     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1402         if (running) {
1403             /* Flush queued packets and wake up backends. */
1404             if (nc->peer && qemu_can_send_packet(nc)) {
1405                 qemu_flush_queued_packets(nc->peer);
1406             }
1407         } else {
1408             /* Complete all queued packets, to guarantee we don't modify
1409              * state later when VM is not running.
1410              */
1411             qemu_flush_or_purge_queued_packets(nc, true);
1412         }
1413     }
1414 }
1415
1416 void net_cleanup(void)
1417 {
1418     NetClientState *nc;
1419
1420     /* We may del multiple entries during qemu_del_net_client(),
1421      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1422      */
1423     while (!QTAILQ_EMPTY(&net_clients)) {
1424         nc = QTAILQ_FIRST(&net_clients);
1425         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1426             qemu_del_nic(qemu_get_nic(nc));
1427         } else {
1428             qemu_del_net_client(nc);
1429         }
1430     }
1431
1432     qemu_del_vm_change_state_handler(net_change_state_entry);
1433 }
1434
1435 void net_check_clients(void)
1436 {
1437     NetClientState *nc;
1438     int i;
1439
1440     /* Don't warn about the default network setup that you get if
1441      * no command line -net or -netdev options are specified. There
1442      * are two cases that we would otherwise complain about:
1443      * (1) board doesn't support a NIC but the implicit "-net nic"
1444      * requested one
1445      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1446      * sets up a nic that isn't connected to anything.
1447      */
1448     if (default_net) {
1449         return;
1450     }
1451
1452     net_hub_check_clients();
1453
1454     QTAILQ_FOREACH(nc, &net_clients, next) {
1455         if (!nc->peer) {
1456             fprintf(stderr, "Warning: %s %s has no peer\n",
1457                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1458                     "nic" : "netdev", nc->name);
1459         }
1460     }
1461
1462     /* Check that all NICs requested via -net nic actually got created.
1463      * NICs created via -device don't need to be checked here because
1464      * they are always instantiated.
1465      */
1466     for (i = 0; i < MAX_NICS; i++) {
1467         NICInfo *nd = &nd_table[i];
1468         if (nd->used && !nd->instantiated) {
1469             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1470                     "was not created (not supported by this machine?)\n",
1471                     nd->name ? nd->name : "anonymous",
1472                     nd->model ? nd->model : "unspecified");
1473         }
1474     }
1475 }
1476
1477 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1478 {
1479     Error *local_err = NULL;
1480
1481     net_client_init(opts, 0, &local_err);
1482     if (local_err) {
1483         error_report_err(local_err);
1484         return -1;
1485     }
1486
1487     return 0;
1488 }
1489
1490 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1491 {
1492     Error *local_err = NULL;
1493     int ret;
1494
1495     ret = net_client_init(opts, 1, &local_err);
1496     if (local_err) {
1497         error_report_err(local_err);
1498         return -1;
1499     }
1500
1501     return ret;
1502 }
1503
1504 int net_init_clients(void)
1505 {
1506     QemuOptsList *net = qemu_find_opts("net");
1507
1508     if (default_net) {
1509         /* if no clients, we use a default config */
1510         qemu_opts_set(net, NULL, "type", "nic", &error_abort);
1511 #ifdef CONFIG_SLIRP
1512         qemu_opts_set(net, NULL, "type", "user", &error_abort);
1513 #endif
1514     }
1515
1516     net_change_state_entry =
1517         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1518
1519     QTAILQ_INIT(&net_clients);
1520
1521     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1522                           net_init_netdev, NULL, NULL)) {
1523         return -1;
1524     }
1525
1526     if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1527         return -1;
1528     }
1529
1530     return 0;
1531 }
1532
1533 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1534 {
1535 #if defined(CONFIG_SLIRP)
1536     int ret;
1537     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1538         return ret;
1539     }
1540 #endif
1541
1542     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1543         return -1;
1544     }
1545
1546     default_net = 0;
1547     return 0;
1548 }
1549
1550 /* From FreeBSD */
1551 /* XXX: optimize */
1552 unsigned compute_mcast_idx(const uint8_t *ep)
1553 {
1554     uint32_t crc;
1555     int carry, i, j;
1556     uint8_t b;
1557
1558     crc = 0xffffffff;
1559     for (i = 0; i < 6; i++) {
1560         b = *ep++;
1561         for (j = 0; j < 8; j++) {
1562             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1563             crc <<= 1;
1564             b >>= 1;
1565             if (carry) {
1566                 crc = ((crc ^ POLYNOMIAL) | carry);
1567             }
1568         }
1569     }
1570     return crc >> 26;
1571 }
1572
1573 QemuOptsList qemu_netdev_opts = {
1574     .name = "netdev",
1575     .implied_opt_name = "type",
1576     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1577     .desc = {
1578         /*
1579          * no elements => accept any params
1580          * validation will happen later
1581          */
1582         { /* end of list */ }
1583     },
1584 };
1585
1586 QemuOptsList qemu_net_opts = {
1587     .name = "net",
1588     .implied_opt_name = "type",
1589     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1590     .desc = {
1591         /*
1592          * no elements => accept any params
1593          * validation will happen later
1594          */
1595         { /* end of list */ }
1596     },
1597 };