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
  25 #include "qemu/osdep.h"
  26
  27 #include "net/net.h"
  28 #include "clients.h"
  29 #include "hub.h"
  30 #include "hw/qdev-properties.h"
  31 #include "net/slirp.h"
  32 #include "net/eth.h"
  33 #include "util.h"
  34
  35 #include "monitor/monitor.h"
  36 #include "qemu/help_option.h"
  37 #include "qapi/qapi-commands-net.h"
  38 #include "qapi/qapi-visit-net.h"
  39 #include "qapi/qmp/qdict.h"
  40 #include "qapi/qmp/qerror.h"
  41 #include "qemu/error-report.h"
  42 #include "qemu/sockets.h"
  43 #include "qemu/cutils.h"
  44 #include "qemu/config-file.h"
  45 #include "qemu/ctype.h"
  46 #include "qemu/iov.h"
  47 #include "qemu/qemu-print.h"
  48 #include "qemu/main-loop.h"
  49 #include "qemu/option.h"
  50 #include "qapi/error.h"
  51 #include "qapi/opts-visitor.h"
  52 #include "sysemu/sysemu.h"
  53 #include "sysemu/qtest.h"
  54 #include "sysemu/runstate.h"
  55 #include "sysemu/sysemu.h"
  56 #include "net/filter.h"
  57 #include "qapi/string-output-visitor.h"
  58
  59 /* Net bridge is currently not supported for W32. */
  60 #if !defined(_WIN32)
  61 # define CONFIG_NET_BRIDGE
  62 #endif
  63
  64 static VMChangeStateEntry *net_change_state_entry;
  65 static QTAILQ_HEAD(, NetClientState) net_clients;
  66
  67 /***********************************************************/
  68 /* network device redirectors */
  69
  70 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  71                     Error **errp)
  72 {
  73     gchar **substrings;
  74     struct hostent *he;
  75     const char *addr, *p, *r;
  76     int port, ret = 0;
  77
  78     substrings = g_strsplit(str, ":", 2);
  79     if (!substrings || !substrings[0] || !substrings[1]) {
  80         error_setg(errp, "host address '%s' doesn't contain ':' "
  81                    "separating host from port", str);
  82         ret = -1;
  83         goto out;
  84     }
  85
  86     addr = substrings[0];
  87     p = substrings[1];
  88
  89     saddr->sin_family = AF_INET;
  90     if (addr[0] == '\0') {
  91         saddr->sin_addr.s_addr = 0;
  92     } else {
  93         if (qemu_isdigit(addr[0])) {
  94             if (!inet_aton(addr, &saddr->sin_addr)) {
  95                 error_setg(errp, "host address '%s' is not a valid "
  96                            "IPv4 address", addr);
  97                 ret = -1;
  98                 goto out;
  99             }
 100         } else {
 101             he = gethostbyname(addr);
 102             if (he == NULL) {
 103                 error_setg(errp, "can't resolve host address '%s'", addr);
 104                 ret = -1;
 105                 goto out;
 106             }
 107             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 108         }
 109     }
 110     port = strtol(p, (char **)&r, 0);
 111     if (r == p) {
 112         error_setg(errp, "port number '%s' is invalid", p);
 113         ret = -1;
 114         goto out;
 115     }
 116     saddr->sin_port = htons(port);
 117
 118 out:
 119     g_strfreev(substrings);
 120     return ret;
 121 }
 122
 123 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 124 {
 125     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 126                            macaddr[0], macaddr[1], macaddr[2],
 127                            macaddr[3], macaddr[4], macaddr[5]);
 128 }
 129
 130 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 131 {
 132     snprintf(nc->info_str, sizeof(nc->info_str),
 133              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 134              nc->model,
 135              macaddr[0], macaddr[1], macaddr[2],
 136              macaddr[3], macaddr[4], macaddr[5]);
 137 }
 138
 139 static int mac_table[256] = {0};
 140
 141 static void qemu_macaddr_set_used(MACAddr *macaddr)
 142 {
 143     int index;
 144
 145     for (index = 0x56; index < 0xFF; index++) {
 146         if (macaddr->a[5] == index) {
 147             mac_table[index]++;
 148         }
 149     }
 150 }
 151
 152 static void qemu_macaddr_set_free(MACAddr *macaddr)
 153 {
 154     int index;
 155     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 156
 157     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 158         return;
 159     }
 160     for (index = 0x56; index < 0xFF; index++) {
 161         if (macaddr->a[5] == index) {
 162             mac_table[index]--;
 163         }
 164     }
 165 }
 166
 167 static int qemu_macaddr_get_free(void)
 168 {
 169     int index;
 170
 171     for (index = 0x56; index < 0xFF; index++) {
 172         if (mac_table[index] == 0) {
 173             return index;
 174         }
 175     }
 176
 177     return -1;
 178 }
 179
 180 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 181 {
 182     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 183     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 184
 185     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 186         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 187             return;
 188         } else {
 189             qemu_macaddr_set_used(macaddr);
 190             return;
 191         }
 192     }
 193
 194     macaddr->a[0] = 0x52;
 195     macaddr->a[1] = 0x54;
 196     macaddr->a[2] = 0x00;
 197     macaddr->a[3] = 0x12;
 198     macaddr->a[4] = 0x34;
 199     macaddr->a[5] = qemu_macaddr_get_free();
 200     qemu_macaddr_set_used(macaddr);
 201 }
 202
 203 /**
 204  * Generate a name for net client
 205  *
 206  * Only net clients created with the legacy -net option and NICs need this.
 207  */
 208 static char *assign_name(NetClientState *nc1, const char *model)
 209 {
 210     NetClientState *nc;
 211     int id = 0;
 212
 213     QTAILQ_FOREACH(nc, &net_clients, next) {
 214         if (nc == nc1) {
 215             continue;
 216         }
 217         if (strcmp(nc->model, model) == 0) {
 218             id++;
 219         }
 220     }
 221
 222     return g_strdup_printf("%s.%d", model, id);
 223 }
 224
 225 static void qemu_net_client_destructor(NetClientState *nc)
 226 {
 227     g_free(nc);
 228 }
 229 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 230                                        unsigned flags,
 231                                        const struct iovec *iov,
 232                                        int iovcnt,
 233                                        void *opaque);
 234
 235 static void qemu_net_client_setup(NetClientState *nc,
 236                                   NetClientInfo *info,
 237                                   NetClientState *peer,
 238                                   const char *model,
 239                                   const char *name,
 240                                   NetClientDestructor *destructor)
 241 {
 242     nc->info = info;
 243     nc->model = g_strdup(model);
 244     if (name) {
 245         nc->name = g_strdup(name);
 246     } else {
 247         nc->name = assign_name(nc, model);
 248     }
 249
 250     if (peer) {
 251         assert(!peer->peer);
 252         nc->peer = peer;
 253         peer->peer = nc;
 254     }
 255     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 256
 257     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 258     nc->destructor = destructor;
 259     QTAILQ_INIT(&nc->filters);
 260 }
 261
 262 NetClientState *qemu_new_net_client(NetClientInfo *info,
 263                                     NetClientState *peer,
 264                                     const char *model,
 265                                     const char *name)
 266 {
 267     NetClientState *nc;
 268
 269     assert(info->size >= sizeof(NetClientState));
 270
 271     nc = g_malloc0(info->size);
 272     qemu_net_client_setup(nc, info, peer, model, name,
 273                           qemu_net_client_destructor);
 274
 275     return nc;
 276 }
 277
 278 NICState *qemu_new_nic(NetClientInfo *info,
 279                        NICConf *conf,
 280                        const char *model,
 281                        const char *name,
 282                        void *opaque)
 283 {
 284     NetClientState **peers = conf->peers.ncs;
 285     NICState *nic;
 286     int i, queues = MAX(1, conf->peers.queues);
 287
 288     assert(info->type == NET_CLIENT_DRIVER_NIC);
 289     assert(info->size >= sizeof(NICState));
 290
 291     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 292     nic->ncs = (void *)nic + info->size;
 293     nic->conf = conf;
 294     nic->opaque = opaque;
 295
 296     for (i = 0; i < queues; i++) {
 297         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 298                               NULL);
 299         nic->ncs[i].queue_index = i;
 300     }
 301
 302     return nic;
 303 }
 304
 305 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 306 {
 307     return nic->ncs + queue_index;
 308 }
 309
 310 NetClientState *qemu_get_queue(NICState *nic)
 311 {
 312     return qemu_get_subqueue(nic, 0);
 313 }
 314
 315 NICState *qemu_get_nic(NetClientState *nc)
 316 {
 317     NetClientState *nc0 = nc - nc->queue_index;
 318
 319     return (NICState *)((void *)nc0 - nc->info->size);
 320 }
 321
 322 void *qemu_get_nic_opaque(NetClientState *nc)
 323 {
 324     NICState *nic = qemu_get_nic(nc);
 325
 326     return nic->opaque;
 327 }
 328
 329 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
 330 {
 331     assert(nc != NULL);
 332     NetClientState *ncs = nc + queue_index;
 333     return ncs->peer;
 334 }
 335
 336 static void qemu_cleanup_net_client(NetClientState *nc)
 337 {
 338     QTAILQ_REMOVE(&net_clients, nc, next);
 339
 340     if (nc->info->cleanup) {
 341         nc->info->cleanup(nc);
 342     }
 343 }
 344
 345 static void qemu_free_net_client(NetClientState *nc)
 346 {
 347     if (nc->incoming_queue) {
 348         qemu_del_net_queue(nc->incoming_queue);
 349     }
 350     if (nc->peer) {
 351         nc->peer->peer = NULL;
 352     }
 353     g_free(nc->name);
 354     g_free(nc->model);
 355     if (nc->destructor) {
 356         nc->destructor(nc);
 357     }
 358 }
 359
 360 void qemu_del_net_client(NetClientState *nc)
 361 {
 362     NetClientState *ncs[MAX_QUEUE_NUM];
 363     int queues, i;
 364     NetFilterState *nf, *next;
 365
 366     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 367
 368     /* If the NetClientState belongs to a multiqueue backend, we will change all
 369      * other NetClientStates also.
 370      */
 371     queues = qemu_find_net_clients_except(nc->name, ncs,
 372                                           NET_CLIENT_DRIVER_NIC,
 373                                           MAX_QUEUE_NUM);
 374     assert(queues != 0);
 375
 376     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 377         object_unparent(OBJECT(nf));
 378     }
 379
 380     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 381     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 382         NICState *nic = qemu_get_nic(nc->peer);
 383         if (nic->peer_deleted) {
 384             return;
 385         }
 386         nic->peer_deleted = true;
 387
 388         for (i = 0; i < queues; i++) {
 389             ncs[i]->peer->link_down = true;
 390         }
 391
 392         if (nc->peer->info->link_status_changed) {
 393             nc->peer->info->link_status_changed(nc->peer);
 394         }
 395
 396         for (i = 0; i < queues; i++) {
 397             qemu_cleanup_net_client(ncs[i]);
 398         }
 399
 400         return;
 401     }
 402
 403     for (i = 0; i < queues; i++) {
 404         qemu_cleanup_net_client(ncs[i]);
 405         qemu_free_net_client(ncs[i]);
 406     }
 407 }
 408
 409 void qemu_del_nic(NICState *nic)
 410 {
 411     int i, queues = MAX(nic->conf->peers.queues, 1);
 412
 413     qemu_macaddr_set_free(&nic->conf->macaddr);
 414
 415     for (i = 0; i < queues; i++) {
 416         NetClientState *nc = qemu_get_subqueue(nic, i);
 417         /* If this is a peer NIC and peer has already been deleted, free it now. */
 418         if (nic->peer_deleted) {
 419             qemu_free_net_client(nc->peer);
 420         } else if (nc->peer) {
 421             /* if there are RX packets pending, complete them */
 422             qemu_purge_queued_packets(nc->peer);
 423         }
 424     }
 425
 426     for (i = queues - 1; i >= 0; i--) {
 427         NetClientState *nc = qemu_get_subqueue(nic, i);
 428
 429         qemu_cleanup_net_client(nc);
 430         qemu_free_net_client(nc);
 431     }
 432
 433     g_free(nic);
 434 }
 435
 436 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 437 {
 438     NetClientState *nc;
 439
 440     QTAILQ_FOREACH(nc, &net_clients, next) {
 441         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 442             if (nc->queue_index == 0) {
 443                 func(qemu_get_nic(nc), opaque);
 444             }
 445         }
 446     }
 447 }
 448
 449 bool qemu_has_ufo(NetClientState *nc)
 450 {
 451     if (!nc || !nc->info->has_ufo) {
 452         return false;
 453     }
 454
 455     return nc->info->has_ufo(nc);
 456 }
 457
 458 bool qemu_has_vnet_hdr(NetClientState *nc)
 459 {
 460     if (!nc || !nc->info->has_vnet_hdr) {
 461         return false;
 462     }
 463
 464     return nc->info->has_vnet_hdr(nc);
 465 }
 466
 467 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 468 {
 469     if (!nc || !nc->info->has_vnet_hdr_len) {
 470         return false;
 471     }
 472
 473     return nc->info->has_vnet_hdr_len(nc, len);
 474 }
 475
 476 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 477 {
 478     if (!nc || !nc->info->using_vnet_hdr) {
 479         return;
 480     }
 481
 482     nc->info->using_vnet_hdr(nc, enable);
 483 }
 484
 485 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 486                           int ecn, int ufo)
 487 {
 488     if (!nc || !nc->info->set_offload) {
 489         return;
 490     }
 491
 492     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 493 }
 494
 495 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 496 {
 497     if (!nc || !nc->info->set_vnet_hdr_len) {
 498         return;
 499     }
 500
 501     nc->vnet_hdr_len = len;
 502     nc->info->set_vnet_hdr_len(nc, len);
 503 }
 504
 505 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 506 {
 507 #ifdef HOST_WORDS_BIGENDIAN
 508     if (!nc || !nc->info->set_vnet_le) {
 509         return -ENOSYS;
 510     }
 511
 512     return nc->info->set_vnet_le(nc, is_le);
 513 #else
 514     return 0;
 515 #endif
 516 }
 517
 518 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 519 {
 520 #ifdef HOST_WORDS_BIGENDIAN
 521     return 0;
 522 #else
 523     if (!nc || !nc->info->set_vnet_be) {
 524         return -ENOSYS;
 525     }
 526
 527     return nc->info->set_vnet_be(nc, is_be);
 528 #endif
 529 }
 530
 531 int qemu_can_send_packet(NetClientState *sender)
 532 {
 533     int vm_running = runstate_is_running();
 534
 535     if (!vm_running) {
 536         return 0;
 537     }
 538
 539     if (!sender->peer) {
 540         return 1;
 541     }
 542
 543     if (sender->peer->receive_disabled) {
 544         return 0;
 545     } else if (sender->peer->info->can_receive &&
 546                !sender->peer->info->can_receive(sender->peer)) {
 547         return 0;
 548     }
 549     return 1;
 550 }
 551
 552 static ssize_t filter_receive_iov(NetClientState *nc,
 553                                   NetFilterDirection direction,
 554                                   NetClientState *sender,
 555                                   unsigned flags,
 556                                   const struct iovec *iov,
 557                                   int iovcnt,
 558                                   NetPacketSent *sent_cb)
 559 {
 560     ssize_t ret = 0;
 561     NetFilterState *nf = NULL;
 562
 563     if (direction == NET_FILTER_DIRECTION_TX) {
 564         QTAILQ_FOREACH(nf, &nc->filters, next) {
 565             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 566                                          iovcnt, sent_cb);
 567             if (ret) {
 568                 return ret;
 569             }
 570         }
 571     } else {
 572         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 573             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 574                                          iovcnt, sent_cb);
 575             if (ret) {
 576                 return ret;
 577             }
 578         }
 579     }
 580
 581     return ret;
 582 }
 583
 584 static ssize_t filter_receive(NetClientState *nc,
 585                               NetFilterDirection direction,
 586                               NetClientState *sender,
 587                               unsigned flags,
 588                               const uint8_t *data,
 589                               size_t size,
 590                               NetPacketSent *sent_cb)
 591 {
 592     struct iovec iov = {
 593         .iov_base = (void *)data,
 594         .iov_len = size
 595     };
 596
 597     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 598 }
 599
 600 void qemu_purge_queued_packets(NetClientState *nc)
 601 {
 602     if (!nc->peer) {
 603         return;
 604     }
 605
 606     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 607 }
 608
 609 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 610 {
 611     nc->receive_disabled = 0;
 612
 613     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 614         if (net_hub_flush(nc->peer)) {
 615             qemu_notify_event();
 616         }
 617     }
 618     if (qemu_net_queue_flush(nc->incoming_queue)) {
 619         /* We emptied the queue successfully, signal to the IO thread to repoll
 620          * the file descriptor (for tap, for example).
 621          */
 622         qemu_notify_event();
 623     } else if (purge) {
 624         /* Unable to empty the queue, purge remaining packets */
 625         qemu_net_queue_purge(nc->incoming_queue, nc->peer);
 626     }
 627 }
 628
 629 void qemu_flush_queued_packets(NetClientState *nc)
 630 {
 631     qemu_flush_or_purge_queued_packets(nc, false);
 632 }
 633
 634 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 635                                                  unsigned flags,
 636                                                  const uint8_t *buf, int size,
 637                                                  NetPacketSent *sent_cb)
 638 {
 639     NetQueue *queue;
 640     int ret;
 641
 642 #ifdef DEBUG_NET
 643     printf("qemu_send_packet_async:\n");
 644     qemu_hexdump(stdout, "net", buf, size);
 645 #endif
 646
 647     if (sender->link_down || !sender->peer) {
 648         return size;
 649     }
 650
 651     /* Let filters handle the packet first */
 652     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 653                          sender, flags, buf, size, sent_cb);
 654     if (ret) {
 655         return ret;
 656     }
 657
 658     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 659                          sender, flags, buf, size, sent_cb);
 660     if (ret) {
 661         return ret;
 662     }
 663
 664     queue = sender->peer->incoming_queue;
 665
 666     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 667 }
 668
 669 ssize_t qemu_send_packet_async(NetClientState *sender,
 670                                const uint8_t *buf, int size,
 671                                NetPacketSent *sent_cb)
 672 {
 673     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 674                                              buf, size, sent_cb);
 675 }
 676
 677 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 678 {
 679     return qemu_send_packet_async(nc, buf, size, NULL);
 680 }
 681
 682 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 683 {
 684     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 685                                              buf, size, NULL);
 686 }
 687
 688 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 689                                int iovcnt, unsigned flags)
 690 {
 691     uint8_t *buf = NULL;
 692     uint8_t *buffer;
 693     size_t offset;
 694     ssize_t ret;
 695
 696     if (iovcnt == 1) {
 697         buffer = iov[0].iov_base;
 698         offset = iov[0].iov_len;
 699     } else {
 700         offset = iov_size(iov, iovcnt);
 701         if (offset > NET_BUFSIZE) {
 702             return -1;
 703         }
 704         buf = g_malloc(offset);
 705         buffer = buf;
 706         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 707     }
 708
 709     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 710         ret = nc->info->receive_raw(nc, buffer, offset);
 711     } else {
 712         ret = nc->info->receive(nc, buffer, offset);
 713     }
 714
 715     g_free(buf);
 716     return ret;
 717 }
 718
 719 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 720                                        unsigned flags,
 721                                        const struct iovec *iov,
 722                                        int iovcnt,
 723                                        void *opaque)
 724 {
 725     NetClientState *nc = opaque;
 726     int ret;
 727
 728
 729     if (nc->link_down) {
 730         return iov_size(iov, iovcnt);
 731     }
 732
 733     if (nc->receive_disabled) {
 734         return 0;
 735     }
 736
 737     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 738         ret = nc->info->receive_iov(nc, iov, iovcnt);
 739     } else {
 740         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 741     }
 742
 743     if (ret == 0) {
 744         nc->receive_disabled = 1;
 745     }
 746
 747     return ret;
 748 }
 749
 750 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 751                                 const struct iovec *iov, int iovcnt,
 752                                 NetPacketSent *sent_cb)
 753 {
 754     NetQueue *queue;
 755     size_t size = iov_size(iov, iovcnt);
 756     int ret;
 757
 758     if (size > NET_BUFSIZE) {
 759         return size;
 760     }
 761
 762     if (sender->link_down || !sender->peer) {
 763         return size;
 764     }
 765
 766     /* Let filters handle the packet first */
 767     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 768                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 769     if (ret) {
 770         return ret;
 771     }
 772
 773     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 774                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 775     if (ret) {
 776         return ret;
 777     }
 778
 779     queue = sender->peer->incoming_queue;
 780
 781     return qemu_net_queue_send_iov(queue, sender,
 782                                    QEMU_NET_PACKET_FLAG_NONE,
 783                                    iov, iovcnt, sent_cb);
 784 }
 785
 786 ssize_t
 787 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 788 {
 789     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 790 }
 791
 792 NetClientState *qemu_find_netdev(const char *id)
 793 {
 794     NetClientState *nc;
 795
 796     QTAILQ_FOREACH(nc, &net_clients, next) {
 797         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 798             continue;
 799         if (!strcmp(nc->name, id)) {
 800             return nc;
 801         }
 802     }
 803
 804     return NULL;
 805 }
 806
 807 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 808                                  NetClientDriver type, int max)
 809 {
 810     NetClientState *nc;
 811     int ret = 0;
 812
 813     QTAILQ_FOREACH(nc, &net_clients, next) {
 814         if (nc->info->type == type) {
 815             continue;
 816         }
 817         if (!id || !strcmp(nc->name, id)) {
 818             if (ret < max) {
 819                 ncs[ret] = nc;
 820             }
 821             ret++;
 822         }
 823     }
 824
 825     return ret;
 826 }
 827
 828 static int nic_get_free_idx(void)
 829 {
 830     int index;
 831
 832     for (index = 0; index < MAX_NICS; index++)
 833         if (!nd_table[index].used)
 834             return index;
 835     return -1;
 836 }
 837
 838 int qemu_show_nic_models(const char *arg, const char *const *models)
 839 {
 840     int i;
 841
 842     if (!arg || !is_help_option(arg)) {
 843         return 0;
 844     }
 845
 846     printf("Supported NIC models:\n");
 847     for (i = 0 ; models[i]; i++) {
 848         printf("%s\n", models[i]);
 849     }
 850     return 1;
 851 }
 852
 853 void qemu_check_nic_model(NICInfo *nd, const char *model)
 854 {
 855     const char *models[2];
 856
 857     models[0] = model;
 858     models[1] = NULL;
 859
 860     if (qemu_show_nic_models(nd->model, models))
 861         exit(0);
 862     if (qemu_find_nic_model(nd, models, model) < 0)
 863         exit(1);
 864 }
 865
 866 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 867                         const char *default_model)
 868 {
 869     int i;
 870
 871     if (!nd->model)
 872         nd->model = g_strdup(default_model);
 873
 874     for (i = 0 ; models[i]; i++) {
 875         if (strcmp(nd->model, models[i]) == 0)
 876             return i;
 877     }
 878
 879     error_report("Unsupported NIC model: %s", nd->model);
 880     return -1;
 881 }
 882
 883 static int net_init_nic(const Netdev *netdev, const char *name,
 884                         NetClientState *peer, Error **errp)
 885 {
 886     int idx;
 887     NICInfo *nd;
 888     const NetLegacyNicOptions *nic;
 889
 890     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 891     nic = &netdev->u.nic;
 892
 893     idx = nic_get_free_idx();
 894     if (idx == -1 || nb_nics >= MAX_NICS) {
 895         error_setg(errp, "too many NICs");
 896         return -1;
 897     }
 898
 899     nd = &nd_table[idx];
 900
 901     memset(nd, 0, sizeof(*nd));
 902
 903     if (nic->has_netdev) {
 904         nd->netdev = qemu_find_netdev(nic->netdev);
 905         if (!nd->netdev) {
 906             error_setg(errp, "netdev '%s' not found", nic->netdev);
 907             return -1;
 908         }
 909     } else {
 910         assert(peer);
 911         nd->netdev = peer;
 912     }
 913     nd->name = g_strdup(name);
 914     if (nic->has_model) {
 915         nd->model = g_strdup(nic->model);
 916     }
 917     if (nic->has_addr) {
 918         nd->devaddr = g_strdup(nic->addr);
 919     }
 920
 921     if (nic->has_macaddr &&
 922         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 923         error_setg(errp, "invalid syntax for ethernet address");
 924         return -1;
 925     }
 926     if (nic->has_macaddr &&
 927         is_multicast_ether_addr(nd->macaddr.a)) {
 928         error_setg(errp,
 929                    "NIC cannot have multicast MAC address (odd 1st byte)");
 930         return -1;
 931     }
 932     qemu_macaddr_default_if_unset(&nd->macaddr);
 933
 934     if (nic->has_vectors) {
 935         if (nic->vectors > 0x7ffffff) {
 936             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 937             return -1;
 938         }
 939         nd->nvectors = nic->vectors;
 940     } else {
 941         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 942     }
 943
 944     nd->used = 1;
 945     nb_nics++;
 946
 947     return idx;
 948 }
 949
 950
 951 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 952     const Netdev *netdev,
 953     const char *name,
 954     NetClientState *peer, Error **errp) = {
 955         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 956 #ifdef CONFIG_SLIRP
 957         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 958 #endif
 959         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 960         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 961 #ifdef CONFIG_VDE
 962         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 963 #endif
 964 #ifdef CONFIG_NETMAP
 965         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 966 #endif
 967 #ifdef CONFIG_NET_BRIDGE
 968         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 969 #endif
 970         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 971 #ifdef CONFIG_VHOST_NET_USER
 972         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 973 #endif
 974 #ifdef CONFIG_VHOST_NET_VDPA
 975         [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
 976 #endif
 977 #ifdef CONFIG_L2TPV3
 978         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 979 #endif
 980 };
 981
 982
 983 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
 984 {
 985     NetClientState *peer = NULL;
 986
 987     if (is_netdev) {
 988         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 989             !net_client_init_fun[netdev->type]) {
 990             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 991                        "a netdev backend type");
 992             return -1;
 993         }
 994     } else {
 995         if (netdev->type == NET_CLIENT_DRIVER_NONE) {
 996             return 0; /* nothing to do */
 997         }
 998         if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
 999             !net_client_init_fun[netdev->type]) {
1000             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1001                        "a net backend type (maybe it is not compiled "
1002                        "into this binary)");
1003             return -1;
1004         }
1005
1006         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1007         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1008             !netdev->u.nic.has_netdev) {
1009             peer = net_hub_add_port(0, NULL, NULL);
1010         }
1011     }
1012
1013     if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1014         /* FIXME drop when all init functions store an Error */
1015         if (errp && !*errp) {
1016             error_setg(errp, "Device '%s' could not be initialized",
1017                        NetClientDriver_str(netdev->type));
1018         }
1019         return -1;
1020     }
1021
1022     if (is_netdev) {
1023         NetClientState *nc;
1024
1025         nc = qemu_find_netdev(netdev->id);
1026         assert(nc);
1027         nc->is_netdev = true;
1028     }
1029
1030     return 0;
1031 }
1032
1033 void show_netdevs(void)
1034 {
1035     int idx;
1036     const char *available_netdevs[] = {
1037         "socket",
1038         "hubport",
1039         "tap",
1040 #ifdef CONFIG_SLIRP
1041         "user",
1042 #endif
1043 #ifdef CONFIG_L2TPV3
1044         "l2tpv3",
1045 #endif
1046 #ifdef CONFIG_VDE
1047         "vde",
1048 #endif
1049 #ifdef CONFIG_NET_BRIDGE
1050         "bridge",
1051 #endif
1052 #ifdef CONFIG_NETMAP
1053         "netmap",
1054 #endif
1055 #ifdef CONFIG_POSIX
1056         "vhost-user",
1057 #endif
1058 #ifdef CONFIG_VHOST_VDPA
1059         "vhost-vdpa",
1060 #endif
1061     };
1062
1063     qemu_printf("Available netdev backend types:\n");
1064     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1065         qemu_printf("%s\n", available_netdevs[idx]);
1066     }
1067 }
1068
1069 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1070 {
1071     gchar **substrings = NULL;
1072     Netdev *object = NULL;
1073     int ret = -1;
1074     Visitor *v = opts_visitor_new(opts);
1075
1076     /* Parse convenience option format ip6-net=fec0::0[/64] */
1077     const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1078
1079     if (ip6_net) {
1080         char *prefix_addr;
1081         unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1082
1083         substrings = g_strsplit(ip6_net, "/", 2);
1084         if (!substrings || !substrings[0]) {
1085             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1086                        "a valid IPv6 prefix");
1087             goto out;
1088         }
1089
1090         prefix_addr = substrings[0];
1091
1092         /* Handle user-specified prefix length. */
1093         if (substrings[1] &&
1094             qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1095         {
1096             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1097                        "ipv6-prefixlen", "a number");
1098             goto out;
1099         }
1100
1101         qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1102         qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1103                             &error_abort);
1104         qemu_opt_unset(opts, "ipv6-net");
1105     }
1106
1107     /* Create an ID for -net if the user did not specify one */
1108     if (!is_netdev && !qemu_opts_id(opts)) {
1109         static int idx;
1110         qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++));
1111     }
1112
1113     if (visit_type_Netdev(v, NULL, &object, errp)) {
1114         ret = net_client_init1(object, is_netdev, errp);
1115     }
1116
1117     qapi_free_Netdev(object);
1118
1119 out:
1120     g_strfreev(substrings);
1121     visit_free(v);
1122     return ret;
1123 }
1124
1125 void netdev_add(QemuOpts *opts, Error **errp)
1126 {
1127     net_client_init(opts, true, errp);
1128 }
1129
1130 void qmp_netdev_add(Netdev *netdev, Error **errp)
1131 {
1132     net_client_init1(netdev, true, errp);
1133 }
1134
1135 void qmp_netdev_del(const char *id, Error **errp)
1136 {
1137     NetClientState *nc;
1138
1139     nc = qemu_find_netdev(id);
1140     if (!nc) {
1141         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1142                   "Device '%s' not found", id);
1143         return;
1144     }
1145
1146     if (!nc->is_netdev) {
1147         error_setg(errp, "Device '%s' is not a netdev", id);
1148         return;
1149     }
1150
1151     qemu_del_net_client(nc);
1152 }
1153
1154 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1155 {
1156     char *str;
1157     ObjectProperty *prop;
1158     ObjectPropertyIterator iter;
1159     Visitor *v;
1160
1161     /* generate info str */
1162     object_property_iter_init(&iter, OBJECT(nf));
1163     while ((prop = object_property_iter_next(&iter))) {
1164         if (!strcmp(prop->name, "type")) {
1165             continue;
1166         }
1167         v = string_output_visitor_new(false, &str);
1168         object_property_get(OBJECT(nf), prop->name, v, NULL);
1169         visit_complete(v, &str);
1170         visit_free(v);
1171         monitor_printf(mon, ",%s=%s", prop->name, str);
1172         g_free(str);
1173     }
1174     monitor_printf(mon, "\n");
1175 }
1176
1177 void print_net_client(Monitor *mon, NetClientState *nc)
1178 {
1179     NetFilterState *nf;
1180
1181     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1182                    nc->queue_index,
1183                    NetClientDriver_str(nc->info->type),
1184                    nc->info_str);
1185     if (!QTAILQ_EMPTY(&nc->filters)) {
1186         monitor_printf(mon, "filters:\n");
1187     }
1188     QTAILQ_FOREACH(nf, &nc->filters, next) {
1189         monitor_printf(mon, "  - %s: type=%s",
1190                        object_get_canonical_path_component(OBJECT(nf)),
1191                        object_get_typename(OBJECT(nf)));
1192         netfilter_print_info(mon, nf);
1193     }
1194 }
1195
1196 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1197                                       Error **errp)
1198 {
1199     NetClientState *nc;
1200     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1201
1202     QTAILQ_FOREACH(nc, &net_clients, next) {
1203         RxFilterInfoList *entry;
1204         RxFilterInfo *info;
1205
1206         if (has_name && strcmp(nc->name, name) != 0) {
1207             continue;
1208         }
1209
1210         /* only query rx-filter information of NIC */
1211         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1212             if (has_name) {
1213                 error_setg(errp, "net client(%s) isn't a NIC", name);
1214                 return NULL;
1215             }
1216             continue;
1217         }
1218
1219         /* only query information on queue 0 since the info is per nic,
1220          * not per queue
1221          */
1222         if (nc->queue_index != 0)
1223             continue;
1224
1225         if (nc->info->query_rx_filter) {
1226             info = nc->info->query_rx_filter(nc);
1227             entry = g_malloc0(sizeof(*entry));
1228             entry->value = info;
1229
1230             if (!filter_list) {
1231                 filter_list = entry;
1232             } else {
1233                 last_entry->next = entry;
1234             }
1235             last_entry = entry;
1236         } else if (has_name) {
1237             error_setg(errp, "net client(%s) doesn't support"
1238                        " rx-filter querying", name);
1239             return NULL;
1240         }
1241
1242         if (has_name) {
1243             break;
1244         }
1245     }
1246
1247     if (filter_list == NULL && has_name) {
1248         error_setg(errp, "invalid net client name: %s", name);
1249     }
1250
1251     return filter_list;
1252 }
1253
1254 void hmp_info_network(Monitor *mon, const QDict *qdict)
1255 {
1256     NetClientState *nc, *peer;
1257     NetClientDriver type;
1258
1259     net_hub_info(mon);
1260
1261     QTAILQ_FOREACH(nc, &net_clients, next) {
1262         peer = nc->peer;
1263         type = nc->info->type;
1264
1265         /* Skip if already printed in hub info */
1266         if (net_hub_id_for_client(nc, NULL) == 0) {
1267             continue;
1268         }
1269
1270         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1271             print_net_client(mon, nc);
1272         } /* else it's a netdev connected to a NIC, printed with the NIC */
1273         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1274             monitor_printf(mon, " \\ ");
1275             print_net_client(mon, peer);
1276         }
1277     }
1278 }
1279
1280 void colo_notify_filters_event(int event, Error **errp)
1281 {
1282     NetClientState *nc;
1283     NetFilterState *nf;
1284     NetFilterClass *nfc = NULL;
1285     Error *local_err = NULL;
1286
1287     QTAILQ_FOREACH(nc, &net_clients, next) {
1288         QTAILQ_FOREACH(nf, &nc->filters, next) {
1289             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1290             nfc->handle_event(nf, event, &local_err);
1291             if (local_err) {
1292                 error_propagate(errp, local_err);
1293                 return;
1294             }
1295         }
1296     }
1297 }
1298
1299 void qmp_set_link(const char *name, bool up, Error **errp)
1300 {
1301     NetClientState *ncs[MAX_QUEUE_NUM];
1302     NetClientState *nc;
1303     int queues, i;
1304
1305     queues = qemu_find_net_clients_except(name, ncs,
1306                                           NET_CLIENT_DRIVER__MAX,
1307                                           MAX_QUEUE_NUM);
1308
1309     if (queues == 0) {
1310         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1311                   "Device '%s' not found", name);
1312         return;
1313     }
1314     nc = ncs[0];
1315
1316     for (i = 0; i < queues; i++) {
1317         ncs[i]->link_down = !up;
1318     }
1319
1320     if (nc->info->link_status_changed) {
1321         nc->info->link_status_changed(nc);
1322     }
1323
1324     if (nc->peer) {
1325         /* Change peer link only if the peer is NIC and then notify peer.
1326          * If the peer is a HUBPORT or a backend, we do not change the
1327          * link status.
1328          *
1329          * This behavior is compatible with qemu hubs where there could be
1330          * multiple clients that can still communicate with each other in
1331          * disconnected mode. For now maintain this compatibility.
1332          */
1333         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1334             for (i = 0; i < queues; i++) {
1335                 ncs[i]->peer->link_down = !up;
1336             }
1337         }
1338         if (nc->peer->info->link_status_changed) {
1339             nc->peer->info->link_status_changed(nc->peer);
1340         }
1341     }
1342 }
1343
1344 static void net_vm_change_state_handler(void *opaque, int running,
1345                                         RunState state)
1346 {
1347     NetClientState *nc;
1348     NetClientState *tmp;
1349
1350     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1351         if (running) {
1352             /* Flush queued packets and wake up backends. */
1353             if (nc->peer && qemu_can_send_packet(nc)) {
1354                 qemu_flush_queued_packets(nc->peer);
1355             }
1356         } else {
1357             /* Complete all queued packets, to guarantee we don't modify
1358              * state later when VM is not running.
1359              */
1360             qemu_flush_or_purge_queued_packets(nc, true);
1361         }
1362     }
1363 }
1364
1365 void net_cleanup(void)
1366 {
1367     NetClientState *nc;
1368
1369     /* We may del multiple entries during qemu_del_net_client(),
1370      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1371      */
1372     while (!QTAILQ_EMPTY(&net_clients)) {
1373         nc = QTAILQ_FIRST(&net_clients);
1374         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1375             qemu_del_nic(qemu_get_nic(nc));
1376         } else {
1377             qemu_del_net_client(nc);
1378         }
1379     }
1380
1381     qemu_del_vm_change_state_handler(net_change_state_entry);
1382 }
1383
1384 void net_check_clients(void)
1385 {
1386     NetClientState *nc;
1387     int i;
1388
1389     net_hub_check_clients();
1390
1391     QTAILQ_FOREACH(nc, &net_clients, next) {
1392         if (!nc->peer) {
1393             warn_report("%s %s has no peer",
1394                         nc->info->type == NET_CLIENT_DRIVER_NIC
1395                         ? "nic" : "netdev",
1396                         nc->name);
1397         }
1398     }
1399
1400     /* Check that all NICs requested via -net nic actually got created.
1401      * NICs created via -device don't need to be checked here because
1402      * they are always instantiated.
1403      */
1404     for (i = 0; i < MAX_NICS; i++) {
1405         NICInfo *nd = &nd_table[i];
1406         if (nd->used && !nd->instantiated) {
1407             warn_report("requested NIC (%s, model %s) "
1408                         "was not created (not supported by this machine?)",
1409                         nd->name ? nd->name : "anonymous",
1410                         nd->model ? nd->model : "unspecified");
1411         }
1412     }
1413 }
1414
1415 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1416 {
1417     return net_client_init(opts, false, errp);
1418 }
1419
1420 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1421 {
1422     const char *type = qemu_opt_get(opts, "type");
1423
1424     if (type && is_help_option(type)) {
1425         show_netdevs();
1426         exit(0);
1427     }
1428     return net_client_init(opts, true, errp);
1429 }
1430
1431 /* For the convenience "--nic" parameter */
1432 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1433 {
1434     char *mac, *nd_id;
1435     int idx, ret;
1436     NICInfo *ni;
1437     const char *type;
1438
1439     type = qemu_opt_get(opts, "type");
1440     if (type && g_str_equal(type, "none")) {
1441         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1442     }
1443
1444     idx = nic_get_free_idx();
1445     if (idx == -1 || nb_nics >= MAX_NICS) {
1446         error_setg(errp, "no more on-board/default NIC slots available");
1447         return -1;
1448     }
1449
1450     if (!type) {
1451         qemu_opt_set(opts, "type", "user", &error_abort);
1452     }
1453
1454     ni = &nd_table[idx];
1455     memset(ni, 0, sizeof(*ni));
1456     ni->model = qemu_opt_get_del(opts, "model");
1457
1458     /* Create an ID if the user did not specify one */
1459     nd_id = g_strdup(qemu_opts_id(opts));
1460     if (!nd_id) {
1461         nd_id = g_strdup_printf("__org.qemu.nic%i", idx);
1462         qemu_opts_set_id(opts, nd_id);
1463     }
1464
1465     /* Handle MAC address */
1466     mac = qemu_opt_get_del(opts, "mac");
1467     if (mac) {
1468         ret = net_parse_macaddr(ni->macaddr.a, mac);
1469         g_free(mac);
1470         if (ret) {
1471             error_setg(errp, "invalid syntax for ethernet address");
1472             goto out;
1473         }
1474         if (is_multicast_ether_addr(ni->macaddr.a)) {
1475             error_setg(errp, "NIC cannot have multicast MAC address");
1476             ret = -1;
1477             goto out;
1478         }
1479     }
1480     qemu_macaddr_default_if_unset(&ni->macaddr);
1481
1482     ret = net_client_init(opts, true, errp);
1483     if (ret == 0) {
1484         ni->netdev = qemu_find_netdev(nd_id);
1485         ni->used = true;
1486         nb_nics++;
1487     }
1488
1489 out:
1490     g_free(nd_id);
1491     return ret;
1492 }
1493
1494 int net_init_clients(Error **errp)
1495 {
1496     net_change_state_entry =
1497         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1498
1499     QTAILQ_INIT(&net_clients);
1500
1501     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1502                           net_init_netdev, NULL, errp)) {
1503         return -1;
1504     }
1505
1506     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1507         return -1;
1508     }
1509
1510     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1511         return -1;
1512     }
1513
1514     return 0;
1515 }
1516
1517 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1518 {
1519     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1520         return -1;
1521     }
1522
1523     return 0;
1524 }
1525
1526 /* From FreeBSD */
1527 /* XXX: optimize */
1528 uint32_t net_crc32(const uint8_t *p, int len)
1529 {
1530     uint32_t crc;
1531     int carry, i, j;
1532     uint8_t b;
1533
1534     crc = 0xffffffff;
1535     for (i = 0; i < len; i++) {
1536         b = *p++;
1537         for (j = 0; j < 8; j++) {
1538             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1539             crc <<= 1;
1540             b >>= 1;
1541             if (carry) {
1542                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1543             }
1544         }
1545     }
1546
1547     return crc;
1548 }
1549
1550 uint32_t net_crc32_le(const uint8_t *p, int len)
1551 {
1552     uint32_t crc;
1553     int carry, i, j;
1554     uint8_t b;
1555
1556     crc = 0xffffffff;
1557     for (i = 0; i < len; i++) {
1558         b = *p++;
1559         for (j = 0; j < 8; j++) {
1560             carry = (crc & 0x1) ^ (b & 0x01);
1561             crc >>= 1;
1562             b >>= 1;
1563             if (carry) {
1564                 crc ^= POLYNOMIAL_LE;
1565             }
1566         }
1567     }
1568
1569     return crc;
1570 }
1571
1572 QemuOptsList qemu_netdev_opts = {
1573     .name = "netdev",
1574     .implied_opt_name = "type",
1575     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1576     .desc = {
1577         /*
1578          * no elements => accept any params
1579          * validation will happen later
1580          */
1581         { /* end of list */ }
1582     },
1583 };
1584
1585 QemuOptsList qemu_nic_opts = {
1586     .name = "nic",
1587     .implied_opt_name = "type",
1588     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1589     .desc = {
1590         /*
1591          * no elements => accept any params
1592          * validation will happen later
1593          */
1594         { /* end of list */ }
1595     },
1596 };
1597
1598 QemuOptsList qemu_net_opts = {
1599     .name = "net",
1600     .implied_opt_name = "type",
1601     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1602     .desc = {
1603         /*
1604          * no elements => accept any params
1605          * validation will happen later
1606          */
1607         { /* end of list */ }
1608     },
1609 };
1610
1611 void net_socket_rs_init(SocketReadState *rs,
1612                         SocketReadStateFinalize *finalize,
1613                         bool vnet_hdr)
1614 {
1615     rs->state = 0;
1616     rs->vnet_hdr = vnet_hdr;
1617     rs->index = 0;
1618     rs->packet_len = 0;
1619     rs->vnet_hdr_len = 0;
1620     memset(rs->buf, 0, sizeof(rs->buf));
1621     rs->finalize = finalize;
1622 }
1623
1624 /*
1625  * Returns
1626  * 0: success
1627  * -1: error occurs
1628  */
1629 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1630 {
1631     unsigned int l;
1632
1633     while (size > 0) {
1634         /* Reassemble a packet from the network.
1635          * 0 = getting length.
1636          * 1 = getting vnet header length.
1637          * 2 = getting data.
1638          */
1639         switch (rs->state) {
1640         case 0:
1641             l = 4 - rs->index;
1642             if (l > size) {
1643                 l = size;
1644             }
1645             memcpy(rs->buf + rs->index, buf, l);
1646             buf += l;
1647             size -= l;
1648             rs->index += l;
1649             if (rs->index == 4) {
1650                 /* got length */
1651                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1652                 rs->index = 0;
1653                 if (rs->vnet_hdr) {
1654                     rs->state = 1;
1655                 } else {
1656                     rs->state = 2;
1657                     rs->vnet_hdr_len = 0;
1658                 }
1659             }
1660             break;
1661         case 1:
1662             l = 4 - rs->index;
1663             if (l > size) {
1664                 l = size;
1665             }
1666             memcpy(rs->buf + rs->index, buf, l);
1667             buf += l;
1668             size -= l;
1669             rs->index += l;
1670             if (rs->index == 4) {
1671                 /* got vnet header length */
1672                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1673                 rs->index = 0;
1674                 rs->state = 2;
1675             }
1676             break;
1677         case 2:
1678             l = rs->packet_len - rs->index;
1679             if (l > size) {
1680                 l = size;
1681             }
1682             if (rs->index + l <= sizeof(rs->buf)) {
1683                 memcpy(rs->buf + rs->index, buf, l);
1684             } else {
1685                 fprintf(stderr, "serious error: oversized packet received,"
1686                     "connection terminated.\n");
1687                 rs->index = rs->state = 0;
1688                 return -1;
1689             }
1690
1691             rs->index += l;
1692             buf += l;
1693             size -= l;
1694             if (rs->index >= rs->packet_len) {
1695                 rs->index = 0;
1696                 rs->state = 0;
1697                 assert(rs->finalize);
1698                 rs->finalize(rs);
1699             }
1700             break;
1701         }
1702     }
1703
1704     assert(size == 0);
1705     return 0;
1706 }