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 #include "qemu-common.h"
  27
  28 #include "net/net.h"
  29 #include "clients.h"
  30 #include "hub.h"
  31 #include "hw/qdev-properties.h"
  32 #include "net/slirp.h"
  33 #include "net/eth.h"
  34 #include "util.h"
  35
  36 #include "monitor/monitor.h"
  37 #include "qemu/help_option.h"
  38 #include "qapi/qapi-commands-net.h"
  39 #include "qapi/qapi-visit-net.h"
  40 #include "qapi/qmp/qdict.h"
  41 #include "qapi/qmp/qerror.h"
  42 #include "qemu/error-report.h"
  43 #include "qemu/sockets.h"
  44 #include "qemu/cutils.h"
  45 #include "qemu/config-file.h"
  46 #include "qemu/ctype.h"
  47 #include "qemu/id.h"
  48 #include "qemu/iov.h"
  49 #include "qemu/qemu-print.h"
  50 #include "qemu/main-loop.h"
  51 #include "qemu/option.h"
  52 #include "qapi/error.h"
  53 #include "qapi/opts-visitor.h"
  54 #include "sysemu/sysemu.h"
  55 #include "sysemu/runstate.h"
  56 #include "sysemu/sysemu.h"
  57 #include "net/filter.h"
  58 #include "qapi/string-output-visitor.h"
  59
  60 /* Net bridge is currently not supported for W32. */
  61 #if !defined(_WIN32)
  62 # define CONFIG_NET_BRIDGE
  63 #endif
  64
  65 static VMChangeStateEntry *net_change_state_entry;
  66 static QTAILQ_HEAD(, NetClientState) net_clients;
  67
  68 /***********************************************************/
  69 /* network device redirectors */
  70
  71 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  72                     Error **errp)
  73 {
  74     gchar **substrings;
  75     struct hostent *he;
  76     const char *addr, *p, *r;
  77     int port, ret = 0;
  78
  79     substrings = g_strsplit(str, ":", 2);
  80     if (!substrings || !substrings[0] || !substrings[1]) {
  81         error_setg(errp, "host address '%s' doesn't contain ':' "
  82                    "separating host from port", str);
  83         ret = -1;
  84         goto out;
  85     }
  86
  87     addr = substrings[0];
  88     p = substrings[1];
  89
  90     saddr->sin_family = AF_INET;
  91     if (addr[0] == '\0') {
  92         saddr->sin_addr.s_addr = 0;
  93     } else {
  94         if (qemu_isdigit(addr[0])) {
  95             if (!inet_aton(addr, &saddr->sin_addr)) {
  96                 error_setg(errp, "host address '%s' is not a valid "
  97                            "IPv4 address", addr);
  98                 ret = -1;
  99                 goto out;
 100             }
 101         } else {
 102             he = gethostbyname(addr);
 103             if (he == NULL) {
 104                 error_setg(errp, "can't resolve host address '%s'", addr);
 105                 ret = -1;
 106                 goto out;
 107             }
 108             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 109         }
 110     }
 111     port = strtol(p, (char **)&r, 0);
 112     if (r == p) {
 113         error_setg(errp, "port number '%s' is invalid", p);
 114         ret = -1;
 115         goto out;
 116     }
 117     saddr->sin_port = htons(port);
 118
 119 out:
 120     g_strfreev(substrings);
 121     return ret;
 122 }
 123
 124 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 125 {
 126     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 127                            macaddr[0], macaddr[1], macaddr[2],
 128                            macaddr[3], macaddr[4], macaddr[5]);
 129 }
 130
 131 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 132 {
 133     snprintf(nc->info_str, sizeof(nc->info_str),
 134              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 135              nc->model,
 136              macaddr[0], macaddr[1], macaddr[2],
 137              macaddr[3], macaddr[4], macaddr[5]);
 138 }
 139
 140 static int mac_table[256] = {0};
 141
 142 static void qemu_macaddr_set_used(MACAddr *macaddr)
 143 {
 144     int index;
 145
 146     for (index = 0x56; index < 0xFF; index++) {
 147         if (macaddr->a[5] == index) {
 148             mac_table[index]++;
 149         }
 150     }
 151 }
 152
 153 static void qemu_macaddr_set_free(MACAddr *macaddr)
 154 {
 155     int index;
 156     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 157
 158     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 159         return;
 160     }
 161     for (index = 0x56; index < 0xFF; index++) {
 162         if (macaddr->a[5] == index) {
 163             mac_table[index]--;
 164         }
 165     }
 166 }
 167
 168 static int qemu_macaddr_get_free(void)
 169 {
 170     int index;
 171
 172     for (index = 0x56; index < 0xFF; index++) {
 173         if (mac_table[index] == 0) {
 174             return index;
 175         }
 176     }
 177
 178     return -1;
 179 }
 180
 181 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 182 {
 183     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 184     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 185
 186     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 187         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 188             return;
 189         } else {
 190             qemu_macaddr_set_used(macaddr);
 191             return;
 192         }
 193     }
 194
 195     macaddr->a[0] = 0x52;
 196     macaddr->a[1] = 0x54;
 197     macaddr->a[2] = 0x00;
 198     macaddr->a[3] = 0x12;
 199     macaddr->a[4] = 0x34;
 200     macaddr->a[5] = qemu_macaddr_get_free();
 201     qemu_macaddr_set_used(macaddr);
 202 }
 203
 204 /**
 205  * Generate a name for net client
 206  *
 207  * Only net clients created with the legacy -net option and NICs need this.
 208  */
 209 static char *assign_name(NetClientState *nc1, const char *model)
 210 {
 211     NetClientState *nc;
 212     int id = 0;
 213
 214     QTAILQ_FOREACH(nc, &net_clients, next) {
 215         if (nc == nc1) {
 216             continue;
 217         }
 218         if (strcmp(nc->model, model) == 0) {
 219             id++;
 220         }
 221     }
 222
 223     return g_strdup_printf("%s.%d", model, id);
 224 }
 225
 226 static void qemu_net_client_destructor(NetClientState *nc)
 227 {
 228     g_free(nc);
 229 }
 230 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 231                                        unsigned flags,
 232                                        const struct iovec *iov,
 233                                        int iovcnt,
 234                                        void *opaque);
 235
 236 static void qemu_net_client_setup(NetClientState *nc,
 237                                   NetClientInfo *info,
 238                                   NetClientState *peer,
 239                                   const char *model,
 240                                   const char *name,
 241                                   NetClientDestructor *destructor)
 242 {
 243     nc->info = info;
 244     nc->model = g_strdup(model);
 245     if (name) {
 246         nc->name = g_strdup(name);
 247     } else {
 248         nc->name = assign_name(nc, model);
 249     }
 250
 251     if (peer) {
 252         assert(!peer->peer);
 253         nc->peer = peer;
 254         peer->peer = nc;
 255     }
 256     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 257
 258     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 259     nc->destructor = destructor;
 260     QTAILQ_INIT(&nc->filters);
 261 }
 262
 263 NetClientState *qemu_new_net_client(NetClientInfo *info,
 264                                     NetClientState *peer,
 265                                     const char *model,
 266                                     const char *name)
 267 {
 268     NetClientState *nc;
 269
 270     assert(info->size >= sizeof(NetClientState));
 271
 272     nc = g_malloc0(info->size);
 273     qemu_net_client_setup(nc, info, peer, model, name,
 274                           qemu_net_client_destructor);
 275
 276     return nc;
 277 }
 278
 279 NICState *qemu_new_nic(NetClientInfo *info,
 280                        NICConf *conf,
 281                        const char *model,
 282                        const char *name,
 283                        void *opaque)
 284 {
 285     NetClientState **peers = conf->peers.ncs;
 286     NICState *nic;
 287     int i, queues = MAX(1, conf->peers.queues);
 288
 289     assert(info->type == NET_CLIENT_DRIVER_NIC);
 290     assert(info->size >= sizeof(NICState));
 291
 292     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 293     nic->ncs = (void *)nic + info->size;
 294     nic->conf = conf;
 295     nic->opaque = opaque;
 296
 297     for (i = 0; i < queues; i++) {
 298         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 299                               NULL);
 300         nic->ncs[i].queue_index = i;
 301     }
 302
 303     return nic;
 304 }
 305
 306 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 307 {
 308     return nic->ncs + queue_index;
 309 }
 310
 311 NetClientState *qemu_get_queue(NICState *nic)
 312 {
 313     return qemu_get_subqueue(nic, 0);
 314 }
 315
 316 NICState *qemu_get_nic(NetClientState *nc)
 317 {
 318     NetClientState *nc0 = nc - nc->queue_index;
 319
 320     return (NICState *)((void *)nc0 - nc->info->size);
 321 }
 322
 323 void *qemu_get_nic_opaque(NetClientState *nc)
 324 {
 325     NICState *nic = qemu_get_nic(nc);
 326
 327     return nic->opaque;
 328 }
 329
 330 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
 331 {
 332     assert(nc != NULL);
 333     NetClientState *ncs = nc + queue_index;
 334     return ncs->peer;
 335 }
 336
 337 static void qemu_cleanup_net_client(NetClientState *nc)
 338 {
 339     QTAILQ_REMOVE(&net_clients, nc, next);
 340
 341     if (nc->info->cleanup) {
 342         nc->info->cleanup(nc);
 343     }
 344 }
 345
 346 static void qemu_free_net_client(NetClientState *nc)
 347 {
 348     if (nc->incoming_queue) {
 349         qemu_del_net_queue(nc->incoming_queue);
 350     }
 351     if (nc->peer) {
 352         nc->peer->peer = NULL;
 353     }
 354     g_free(nc->name);
 355     g_free(nc->model);
 356     if (nc->destructor) {
 357         nc->destructor(nc);
 358     }
 359 }
 360
 361 void qemu_del_net_client(NetClientState *nc)
 362 {
 363     NetClientState *ncs[MAX_QUEUE_NUM];
 364     int queues, i;
 365     NetFilterState *nf, *next;
 366
 367     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 368
 369     /* If the NetClientState belongs to a multiqueue backend, we will change all
 370      * other NetClientStates also.
 371      */
 372     queues = qemu_find_net_clients_except(nc->name, ncs,
 373                                           NET_CLIENT_DRIVER_NIC,
 374                                           MAX_QUEUE_NUM);
 375     assert(queues != 0);
 376
 377     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 378         object_unparent(OBJECT(nf));
 379     }
 380
 381     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 382     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 383         NICState *nic = qemu_get_nic(nc->peer);
 384         if (nic->peer_deleted) {
 385             return;
 386         }
 387         nic->peer_deleted = true;
 388
 389         for (i = 0; i < queues; i++) {
 390             ncs[i]->peer->link_down = true;
 391         }
 392
 393         if (nc->peer->info->link_status_changed) {
 394             nc->peer->info->link_status_changed(nc->peer);
 395         }
 396
 397         for (i = 0; i < queues; i++) {
 398             qemu_cleanup_net_client(ncs[i]);
 399         }
 400
 401         return;
 402     }
 403
 404     for (i = 0; i < queues; i++) {
 405         qemu_cleanup_net_client(ncs[i]);
 406         qemu_free_net_client(ncs[i]);
 407     }
 408 }
 409
 410 void qemu_del_nic(NICState *nic)
 411 {
 412     int i, queues = MAX(nic->conf->peers.queues, 1);
 413
 414     qemu_macaddr_set_free(&nic->conf->macaddr);
 415
 416     for (i = 0; i < queues; i++) {
 417         NetClientState *nc = qemu_get_subqueue(nic, i);
 418         /* If this is a peer NIC and peer has already been deleted, free it now. */
 419         if (nic->peer_deleted) {
 420             qemu_free_net_client(nc->peer);
 421         } else if (nc->peer) {
 422             /* if there are RX packets pending, complete them */
 423             qemu_purge_queued_packets(nc->peer);
 424         }
 425     }
 426
 427     for (i = queues - 1; i >= 0; i--) {
 428         NetClientState *nc = qemu_get_subqueue(nic, i);
 429
 430         qemu_cleanup_net_client(nc);
 431         qemu_free_net_client(nc);
 432     }
 433
 434     g_free(nic);
 435 }
 436
 437 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 438 {
 439     NetClientState *nc;
 440
 441     QTAILQ_FOREACH(nc, &net_clients, next) {
 442         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 443             if (nc->queue_index == 0) {
 444                 func(qemu_get_nic(nc), opaque);
 445             }
 446         }
 447     }
 448 }
 449
 450 bool qemu_has_ufo(NetClientState *nc)
 451 {
 452     if (!nc || !nc->info->has_ufo) {
 453         return false;
 454     }
 455
 456     return nc->info->has_ufo(nc);
 457 }
 458
 459 bool qemu_has_vnet_hdr(NetClientState *nc)
 460 {
 461     if (!nc || !nc->info->has_vnet_hdr) {
 462         return false;
 463     }
 464
 465     return nc->info->has_vnet_hdr(nc);
 466 }
 467
 468 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 469 {
 470     if (!nc || !nc->info->has_vnet_hdr_len) {
 471         return false;
 472     }
 473
 474     return nc->info->has_vnet_hdr_len(nc, len);
 475 }
 476
 477 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 478 {
 479     if (!nc || !nc->info->using_vnet_hdr) {
 480         return;
 481     }
 482
 483     nc->info->using_vnet_hdr(nc, enable);
 484 }
 485
 486 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 487                           int ecn, int ufo)
 488 {
 489     if (!nc || !nc->info->set_offload) {
 490         return;
 491     }
 492
 493     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 494 }
 495
 496 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 497 {
 498     if (!nc || !nc->info->set_vnet_hdr_len) {
 499         return;
 500     }
 501
 502     nc->vnet_hdr_len = len;
 503     nc->info->set_vnet_hdr_len(nc, len);
 504 }
 505
 506 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 507 {
 508 #ifdef HOST_WORDS_BIGENDIAN
 509     if (!nc || !nc->info->set_vnet_le) {
 510         return -ENOSYS;
 511     }
 512
 513     return nc->info->set_vnet_le(nc, is_le);
 514 #else
 515     return 0;
 516 #endif
 517 }
 518
 519 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 520 {
 521 #ifdef HOST_WORDS_BIGENDIAN
 522     return 0;
 523 #else
 524     if (!nc || !nc->info->set_vnet_be) {
 525         return -ENOSYS;
 526     }
 527
 528     return nc->info->set_vnet_be(nc, is_be);
 529 #endif
 530 }
 531
 532 int qemu_can_send_packet(NetClientState *sender)
 533 {
 534     int vm_running = runstate_is_running();
 535
 536     if (!vm_running) {
 537         return 0;
 538     }
 539
 540     if (!sender->peer) {
 541         return 1;
 542     }
 543
 544     if (sender->peer->receive_disabled) {
 545         return 0;
 546     } else if (sender->peer->info->can_receive &&
 547                !sender->peer->info->can_receive(sender->peer)) {
 548         return 0;
 549     }
 550     return 1;
 551 }
 552
 553 static ssize_t filter_receive_iov(NetClientState *nc,
 554                                   NetFilterDirection direction,
 555                                   NetClientState *sender,
 556                                   unsigned flags,
 557                                   const struct iovec *iov,
 558                                   int iovcnt,
 559                                   NetPacketSent *sent_cb)
 560 {
 561     ssize_t ret = 0;
 562     NetFilterState *nf = NULL;
 563
 564     if (direction == NET_FILTER_DIRECTION_TX) {
 565         QTAILQ_FOREACH(nf, &nc->filters, next) {
 566             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 567                                          iovcnt, sent_cb);
 568             if (ret) {
 569                 return ret;
 570             }
 571         }
 572     } else {
 573         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 574             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 575                                          iovcnt, sent_cb);
 576             if (ret) {
 577                 return ret;
 578             }
 579         }
 580     }
 581
 582     return ret;
 583 }
 584
 585 static ssize_t filter_receive(NetClientState *nc,
 586                               NetFilterDirection direction,
 587                               NetClientState *sender,
 588                               unsigned flags,
 589                               const uint8_t *data,
 590                               size_t size,
 591                               NetPacketSent *sent_cb)
 592 {
 593     struct iovec iov = {
 594         .iov_base = (void *)data,
 595         .iov_len = size
 596     };
 597
 598     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 599 }
 600
 601 void qemu_purge_queued_packets(NetClientState *nc)
 602 {
 603     if (!nc->peer) {
 604         return;
 605     }
 606
 607     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 608 }
 609
 610 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 611 {
 612     nc->receive_disabled = 0;
 613
 614     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 615         if (net_hub_flush(nc->peer)) {
 616             qemu_notify_event();
 617         }
 618     }
 619     if (qemu_net_queue_flush(nc->incoming_queue)) {
 620         /* We emptied the queue successfully, signal to the IO thread to repoll
 621          * the file descriptor (for tap, for example).
 622          */
 623         qemu_notify_event();
 624     } else if (purge) {
 625         /* Unable to empty the queue, purge remaining packets */
 626         qemu_net_queue_purge(nc->incoming_queue, nc->peer);
 627     }
 628 }
 629
 630 void qemu_flush_queued_packets(NetClientState *nc)
 631 {
 632     qemu_flush_or_purge_queued_packets(nc, false);
 633 }
 634
 635 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 636                                                  unsigned flags,
 637                                                  const uint8_t *buf, int size,
 638                                                  NetPacketSent *sent_cb)
 639 {
 640     NetQueue *queue;
 641     int ret;
 642
 643 #ifdef DEBUG_NET
 644     printf("qemu_send_packet_async:\n");
 645     qemu_hexdump(stdout, "net", buf, size);
 646 #endif
 647
 648     if (sender->link_down || !sender->peer) {
 649         return size;
 650     }
 651
 652     /* Let filters handle the packet first */
 653     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 654                          sender, flags, buf, size, sent_cb);
 655     if (ret) {
 656         return ret;
 657     }
 658
 659     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 660                          sender, flags, buf, size, sent_cb);
 661     if (ret) {
 662         return ret;
 663     }
 664
 665     queue = sender->peer->incoming_queue;
 666
 667     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 668 }
 669
 670 ssize_t qemu_send_packet_async(NetClientState *sender,
 671                                const uint8_t *buf, int size,
 672                                NetPacketSent *sent_cb)
 673 {
 674     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 675                                              buf, size, sent_cb);
 676 }
 677
 678 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 679 {
 680     return qemu_send_packet_async(nc, buf, size, NULL);
 681 }
 682
 683 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 684 {
 685     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 686                                              buf, size, NULL);
 687 }
 688
 689 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 690                                int iovcnt, unsigned flags)
 691 {
 692     uint8_t *buf = NULL;
 693     uint8_t *buffer;
 694     size_t offset;
 695     ssize_t ret;
 696
 697     if (iovcnt == 1) {
 698         buffer = iov[0].iov_base;
 699         offset = iov[0].iov_len;
 700     } else {
 701         offset = iov_size(iov, iovcnt);
 702         if (offset > NET_BUFSIZE) {
 703             return -1;
 704         }
 705         buf = g_malloc(offset);
 706         buffer = buf;
 707         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 708     }
 709
 710     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 711         ret = nc->info->receive_raw(nc, buffer, offset);
 712     } else {
 713         ret = nc->info->receive(nc, buffer, offset);
 714     }
 715
 716     g_free(buf);
 717     return ret;
 718 }
 719
 720 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 721                                        unsigned flags,
 722                                        const struct iovec *iov,
 723                                        int iovcnt,
 724                                        void *opaque)
 725 {
 726     NetClientState *nc = opaque;
 727     int ret;
 728
 729
 730     if (nc->link_down) {
 731         return iov_size(iov, iovcnt);
 732     }
 733
 734     if (nc->receive_disabled) {
 735         return 0;
 736     }
 737
 738     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 739         ret = nc->info->receive_iov(nc, iov, iovcnt);
 740     } else {
 741         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 742     }
 743
 744     if (ret == 0) {
 745         nc->receive_disabled = 1;
 746     }
 747
 748     return ret;
 749 }
 750
 751 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 752                                 const struct iovec *iov, int iovcnt,
 753                                 NetPacketSent *sent_cb)
 754 {
 755     NetQueue *queue;
 756     size_t size = iov_size(iov, iovcnt);
 757     int ret;
 758
 759     if (size > NET_BUFSIZE) {
 760         return size;
 761     }
 762
 763     if (sender->link_down || !sender->peer) {
 764         return size;
 765     }
 766
 767     /* Let filters handle the packet first */
 768     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 769                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 770     if (ret) {
 771         return ret;
 772     }
 773
 774     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 775                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 776     if (ret) {
 777         return ret;
 778     }
 779
 780     queue = sender->peer->incoming_queue;
 781
 782     return qemu_net_queue_send_iov(queue, sender,
 783                                    QEMU_NET_PACKET_FLAG_NONE,
 784                                    iov, iovcnt, sent_cb);
 785 }
 786
 787 ssize_t
 788 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 789 {
 790     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 791 }
 792
 793 NetClientState *qemu_find_netdev(const char *id)
 794 {
 795     NetClientState *nc;
 796
 797     QTAILQ_FOREACH(nc, &net_clients, next) {
 798         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 799             continue;
 800         if (!strcmp(nc->name, id)) {
 801             return nc;
 802         }
 803     }
 804
 805     return NULL;
 806 }
 807
 808 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 809                                  NetClientDriver type, int max)
 810 {
 811     NetClientState *nc;
 812     int ret = 0;
 813
 814     QTAILQ_FOREACH(nc, &net_clients, next) {
 815         if (nc->info->type == type) {
 816             continue;
 817         }
 818         if (!id || !strcmp(nc->name, id)) {
 819             if (ret < max) {
 820                 ncs[ret] = nc;
 821             }
 822             ret++;
 823         }
 824     }
 825
 826     return ret;
 827 }
 828
 829 static int nic_get_free_idx(void)
 830 {
 831     int index;
 832
 833     for (index = 0; index < MAX_NICS; index++)
 834         if (!nd_table[index].used)
 835             return index;
 836     return -1;
 837 }
 838
 839 int qemu_show_nic_models(const char *arg, const char *const *models)
 840 {
 841     int i;
 842
 843     if (!arg || !is_help_option(arg)) {
 844         return 0;
 845     }
 846
 847     printf("Supported NIC models:\n");
 848     for (i = 0 ; models[i]; i++) {
 849         printf("%s\n", models[i]);
 850     }
 851     return 1;
 852 }
 853
 854 void qemu_check_nic_model(NICInfo *nd, const char *model)
 855 {
 856     const char *models[2];
 857
 858     models[0] = model;
 859     models[1] = NULL;
 860
 861     if (qemu_show_nic_models(nd->model, models))
 862         exit(0);
 863     if (qemu_find_nic_model(nd, models, model) < 0)
 864         exit(1);
 865 }
 866
 867 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 868                         const char *default_model)
 869 {
 870     int i;
 871
 872     if (!nd->model)
 873         nd->model = g_strdup(default_model);
 874
 875     for (i = 0 ; models[i]; i++) {
 876         if (strcmp(nd->model, models[i]) == 0)
 877             return i;
 878     }
 879
 880     error_report("Unsupported NIC model: %s", nd->model);
 881     return -1;
 882 }
 883
 884 static int net_init_nic(const Netdev *netdev, const char *name,
 885                         NetClientState *peer, Error **errp)
 886 {
 887     int idx;
 888     NICInfo *nd;
 889     const NetLegacyNicOptions *nic;
 890
 891     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 892     nic = &netdev->u.nic;
 893
 894     idx = nic_get_free_idx();
 895     if (idx == -1 || nb_nics >= MAX_NICS) {
 896         error_setg(errp, "too many NICs");
 897         return -1;
 898     }
 899
 900     nd = &nd_table[idx];
 901
 902     memset(nd, 0, sizeof(*nd));
 903
 904     if (nic->has_netdev) {
 905         nd->netdev = qemu_find_netdev(nic->netdev);
 906         if (!nd->netdev) {
 907             error_setg(errp, "netdev '%s' not found", nic->netdev);
 908             return -1;
 909         }
 910     } else {
 911         assert(peer);
 912         nd->netdev = peer;
 913     }
 914     nd->name = g_strdup(name);
 915     if (nic->has_model) {
 916         nd->model = g_strdup(nic->model);
 917     }
 918     if (nic->has_addr) {
 919         nd->devaddr = g_strdup(nic->addr);
 920     }
 921
 922     if (nic->has_macaddr &&
 923         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 924         error_setg(errp, "invalid syntax for ethernet address");
 925         return -1;
 926     }
 927     if (nic->has_macaddr &&
 928         is_multicast_ether_addr(nd->macaddr.a)) {
 929         error_setg(errp,
 930                    "NIC cannot have multicast MAC address (odd 1st byte)");
 931         return -1;
 932     }
 933     qemu_macaddr_default_if_unset(&nd->macaddr);
 934
 935     if (nic->has_vectors) {
 936         if (nic->vectors > 0x7ffffff) {
 937             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 938             return -1;
 939         }
 940         nd->nvectors = nic->vectors;
 941     } else {
 942         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 943     }
 944
 945     nd->used = 1;
 946     nb_nics++;
 947
 948     return idx;
 949 }
 950
 951
 952 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 953     const Netdev *netdev,
 954     const char *name,
 955     NetClientState *peer, Error **errp) = {
 956         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 957 #ifdef CONFIG_SLIRP
 958         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 959 #endif
 960         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 961         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 962 #ifdef CONFIG_VDE
 963         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 964 #endif
 965 #ifdef CONFIG_NETMAP
 966         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 967 #endif
 968 #ifdef CONFIG_NET_BRIDGE
 969         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 970 #endif
 971         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 972 #ifdef CONFIG_VHOST_NET_USER
 973         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 974 #endif
 975 #ifdef CONFIG_VHOST_NET_VDPA
 976         [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
 977 #endif
 978 #ifdef CONFIG_L2TPV3
 979         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 980 #endif
 981 };
 982
 983
 984 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
 985 {
 986     NetClientState *peer = NULL;
 987     NetClientState *nc;
 988
 989     if (is_netdev) {
 990         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 991             !net_client_init_fun[netdev->type]) {
 992             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 993                        "a netdev backend type");
 994             return -1;
 995         }
 996     } else {
 997         if (netdev->type == NET_CLIENT_DRIVER_NONE) {
 998             return 0; /* nothing to do */
 999         }
1000         if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
1001             !net_client_init_fun[netdev->type]) {
1002             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1003                        "a net backend type (maybe it is not compiled "
1004                        "into this binary)");
1005             return -1;
1006         }
1007
1008         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1009         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1010             !netdev->u.nic.has_netdev) {
1011             peer = net_hub_add_port(0, NULL, NULL);
1012         }
1013     }
1014
1015     nc = qemu_find_netdev(netdev->id);
1016     if (nc) {
1017         error_setg(errp, "Duplicate ID '%s'", netdev->id);
1018         return -1;
1019     }
1020
1021     if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1022         /* FIXME drop when all init functions store an Error */
1023         if (errp && !*errp) {
1024             error_setg(errp, "Device '%s' could not be initialized",
1025                        NetClientDriver_str(netdev->type));
1026         }
1027         return -1;
1028     }
1029
1030     if (is_netdev) {
1031         nc = qemu_find_netdev(netdev->id);
1032         assert(nc);
1033         nc->is_netdev = true;
1034     }
1035
1036     return 0;
1037 }
1038
1039 void show_netdevs(void)
1040 {
1041     int idx;
1042     const char *available_netdevs[] = {
1043         "socket",
1044         "hubport",
1045         "tap",
1046 #ifdef CONFIG_SLIRP
1047         "user",
1048 #endif
1049 #ifdef CONFIG_L2TPV3
1050         "l2tpv3",
1051 #endif
1052 #ifdef CONFIG_VDE
1053         "vde",
1054 #endif
1055 #ifdef CONFIG_NET_BRIDGE
1056         "bridge",
1057 #endif
1058 #ifdef CONFIG_NETMAP
1059         "netmap",
1060 #endif
1061 #ifdef CONFIG_POSIX
1062         "vhost-user",
1063 #endif
1064 #ifdef CONFIG_VHOST_VDPA
1065         "vhost-vdpa",
1066 #endif
1067     };
1068
1069     qemu_printf("Available netdev backend types:\n");
1070     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1071         qemu_printf("%s\n", available_netdevs[idx]);
1072     }
1073 }
1074
1075 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1076 {
1077     gchar **substrings = NULL;
1078     Netdev *object = NULL;
1079     int ret = -1;
1080     Visitor *v = opts_visitor_new(opts);
1081
1082     /* Parse convenience option format ip6-net=fec0::0[/64] */
1083     const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1084
1085     if (ip6_net) {
1086         char *prefix_addr;
1087         unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1088
1089         substrings = g_strsplit(ip6_net, "/", 2);
1090         if (!substrings || !substrings[0]) {
1091             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1092                        "a valid IPv6 prefix");
1093             goto out;
1094         }
1095
1096         prefix_addr = substrings[0];
1097
1098         /* Handle user-specified prefix length. */
1099         if (substrings[1] &&
1100             qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1101         {
1102             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1103                        "ipv6-prefixlen", "a number");
1104             goto out;
1105         }
1106
1107         qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1108         qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1109                             &error_abort);
1110         qemu_opt_unset(opts, "ipv6-net");
1111     }
1112
1113     /* Create an ID for -net if the user did not specify one */
1114     if (!is_netdev && !qemu_opts_id(opts)) {
1115         qemu_opts_set_id(opts, id_generate(ID_NET));
1116     }
1117
1118     if (visit_type_Netdev(v, NULL, &object, errp)) {
1119         ret = net_client_init1(object, is_netdev, errp);
1120     }
1121
1122     qapi_free_Netdev(object);
1123
1124 out:
1125     g_strfreev(substrings);
1126     visit_free(v);
1127     return ret;
1128 }
1129
1130 void netdev_add(QemuOpts *opts, Error **errp)
1131 {
1132     net_client_init(opts, true, errp);
1133 }
1134
1135 void qmp_netdev_add(Netdev *netdev, Error **errp)
1136 {
1137     if (!id_wellformed(netdev->id)) {
1138         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
1139         return;
1140     }
1141
1142     net_client_init1(netdev, true, errp);
1143 }
1144
1145 void qmp_netdev_del(const char *id, Error **errp)
1146 {
1147     NetClientState *nc;
1148     QemuOpts *opts;
1149
1150     nc = qemu_find_netdev(id);
1151     if (!nc) {
1152         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1153                   "Device '%s' not found", id);
1154         return;
1155     }
1156
1157     if (!nc->is_netdev) {
1158         error_setg(errp, "Device '%s' is not a netdev", id);
1159         return;
1160     }
1161
1162     qemu_del_net_client(nc);
1163
1164     /*
1165      * Wart: we need to delete the QemuOpts associated with netdevs
1166      * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in
1167      * HMP netdev_add.
1168      */
1169     opts = qemu_opts_find(qemu_find_opts("netdev"), id);
1170     if (opts) {
1171         qemu_opts_del(opts);
1172     }
1173 }
1174
1175 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1176 {
1177     char *str;
1178     ObjectProperty *prop;
1179     ObjectPropertyIterator iter;
1180     Visitor *v;
1181
1182     /* generate info str */
1183     object_property_iter_init(&iter, OBJECT(nf));
1184     while ((prop = object_property_iter_next(&iter))) {
1185         if (!strcmp(prop->name, "type")) {
1186             continue;
1187         }
1188         v = string_output_visitor_new(false, &str);
1189         object_property_get(OBJECT(nf), prop->name, v, NULL);
1190         visit_complete(v, &str);
1191         visit_free(v);
1192         monitor_printf(mon, ",%s=%s", prop->name, str);
1193         g_free(str);
1194     }
1195     monitor_printf(mon, "\n");
1196 }
1197
1198 void print_net_client(Monitor *mon, NetClientState *nc)
1199 {
1200     NetFilterState *nf;
1201
1202     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1203                    nc->queue_index,
1204                    NetClientDriver_str(nc->info->type),
1205                    nc->info_str);
1206     if (!QTAILQ_EMPTY(&nc->filters)) {
1207         monitor_printf(mon, "filters:\n");
1208     }
1209     QTAILQ_FOREACH(nf, &nc->filters, next) {
1210         monitor_printf(mon, "  - %s: type=%s",
1211                        object_get_canonical_path_component(OBJECT(nf)),
1212                        object_get_typename(OBJECT(nf)));
1213         netfilter_print_info(mon, nf);
1214     }
1215 }
1216
1217 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1218                                       Error **errp)
1219 {
1220     NetClientState *nc;
1221     RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
1222
1223     QTAILQ_FOREACH(nc, &net_clients, next) {
1224         RxFilterInfo *info;
1225
1226         if (has_name && strcmp(nc->name, name) != 0) {
1227             continue;
1228         }
1229
1230         /* only query rx-filter information of NIC */
1231         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1232             if (has_name) {
1233                 error_setg(errp, "net client(%s) isn't a NIC", name);
1234                 assert(!filter_list);
1235                 return NULL;
1236             }
1237             continue;
1238         }
1239
1240         /* only query information on queue 0 since the info is per nic,
1241          * not per queue
1242          */
1243         if (nc->queue_index != 0)
1244             continue;
1245
1246         if (nc->info->query_rx_filter) {
1247             info = nc->info->query_rx_filter(nc);
1248             QAPI_LIST_APPEND(tail, info);
1249         } else if (has_name) {
1250             error_setg(errp, "net client(%s) doesn't support"
1251                        " rx-filter querying", name);
1252             assert(!filter_list);
1253             return NULL;
1254         }
1255
1256         if (has_name) {
1257             break;
1258         }
1259     }
1260
1261     if (filter_list == NULL && has_name) {
1262         error_setg(errp, "invalid net client name: %s", name);
1263     }
1264
1265     return filter_list;
1266 }
1267
1268 void hmp_info_network(Monitor *mon, const QDict *qdict)
1269 {
1270     NetClientState *nc, *peer;
1271     NetClientDriver type;
1272
1273     net_hub_info(mon);
1274
1275     QTAILQ_FOREACH(nc, &net_clients, next) {
1276         peer = nc->peer;
1277         type = nc->info->type;
1278
1279         /* Skip if already printed in hub info */
1280         if (net_hub_id_for_client(nc, NULL) == 0) {
1281             continue;
1282         }
1283
1284         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1285             print_net_client(mon, nc);
1286         } /* else it's a netdev connected to a NIC, printed with the NIC */
1287         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1288             monitor_printf(mon, " \\ ");
1289             print_net_client(mon, peer);
1290         }
1291     }
1292 }
1293
1294 void colo_notify_filters_event(int event, Error **errp)
1295 {
1296     NetClientState *nc;
1297     NetFilterState *nf;
1298     NetFilterClass *nfc = NULL;
1299     Error *local_err = NULL;
1300
1301     QTAILQ_FOREACH(nc, &net_clients, next) {
1302         QTAILQ_FOREACH(nf, &nc->filters, next) {
1303             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1304             nfc->handle_event(nf, event, &local_err);
1305             if (local_err) {
1306                 error_propagate(errp, local_err);
1307                 return;
1308             }
1309         }
1310     }
1311 }
1312
1313 void qmp_set_link(const char *name, bool up, Error **errp)
1314 {
1315     NetClientState *ncs[MAX_QUEUE_NUM];
1316     NetClientState *nc;
1317     int queues, i;
1318
1319     queues = qemu_find_net_clients_except(name, ncs,
1320                                           NET_CLIENT_DRIVER__MAX,
1321                                           MAX_QUEUE_NUM);
1322
1323     if (queues == 0) {
1324         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1325                   "Device '%s' not found", name);
1326         return;
1327     }
1328     nc = ncs[0];
1329
1330     for (i = 0; i < queues; i++) {
1331         ncs[i]->link_down = !up;
1332     }
1333
1334     if (nc->info->link_status_changed) {
1335         nc->info->link_status_changed(nc);
1336     }
1337
1338     if (nc->peer) {
1339         /* Change peer link only if the peer is NIC and then notify peer.
1340          * If the peer is a HUBPORT or a backend, we do not change the
1341          * link status.
1342          *
1343          * This behavior is compatible with qemu hubs where there could be
1344          * multiple clients that can still communicate with each other in
1345          * disconnected mode. For now maintain this compatibility.
1346          */
1347         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1348             for (i = 0; i < queues; i++) {
1349                 ncs[i]->peer->link_down = !up;
1350             }
1351         }
1352         if (nc->peer->info->link_status_changed) {
1353             nc->peer->info->link_status_changed(nc->peer);
1354         }
1355     }
1356 }
1357
1358 static void net_vm_change_state_handler(void *opaque, bool running,
1359                                         RunState state)
1360 {
1361     NetClientState *nc;
1362     NetClientState *tmp;
1363
1364     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1365         if (running) {
1366             /* Flush queued packets and wake up backends. */
1367             if (nc->peer && qemu_can_send_packet(nc)) {
1368                 qemu_flush_queued_packets(nc->peer);
1369             }
1370         } else {
1371             /* Complete all queued packets, to guarantee we don't modify
1372              * state later when VM is not running.
1373              */
1374             qemu_flush_or_purge_queued_packets(nc, true);
1375         }
1376     }
1377 }
1378
1379 void net_cleanup(void)
1380 {
1381     NetClientState *nc;
1382
1383     /* We may del multiple entries during qemu_del_net_client(),
1384      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1385      */
1386     while (!QTAILQ_EMPTY(&net_clients)) {
1387         nc = QTAILQ_FIRST(&net_clients);
1388         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1389             qemu_del_nic(qemu_get_nic(nc));
1390         } else {
1391             qemu_del_net_client(nc);
1392         }
1393     }
1394
1395     qemu_del_vm_change_state_handler(net_change_state_entry);
1396 }
1397
1398 void net_check_clients(void)
1399 {
1400     NetClientState *nc;
1401     int i;
1402
1403     net_hub_check_clients();
1404
1405     QTAILQ_FOREACH(nc, &net_clients, next) {
1406         if (!nc->peer) {
1407             warn_report("%s %s has no peer",
1408                         nc->info->type == NET_CLIENT_DRIVER_NIC
1409                         ? "nic" : "netdev",
1410                         nc->name);
1411         }
1412     }
1413
1414     /* Check that all NICs requested via -net nic actually got created.
1415      * NICs created via -device don't need to be checked here because
1416      * they are always instantiated.
1417      */
1418     for (i = 0; i < MAX_NICS; i++) {
1419         NICInfo *nd = &nd_table[i];
1420         if (nd->used && !nd->instantiated) {
1421             warn_report("requested NIC (%s, model %s) "
1422                         "was not created (not supported by this machine?)",
1423                         nd->name ? nd->name : "anonymous",
1424                         nd->model ? nd->model : "unspecified");
1425         }
1426     }
1427 }
1428
1429 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1430 {
1431     return net_client_init(opts, false, errp);
1432 }
1433
1434 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1435 {
1436     const char *type = qemu_opt_get(opts, "type");
1437
1438     if (type && is_help_option(type)) {
1439         show_netdevs();
1440         exit(0);
1441     }
1442     return net_client_init(opts, true, errp);
1443 }
1444
1445 /* For the convenience "--nic" parameter */
1446 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1447 {
1448     char *mac, *nd_id;
1449     int idx, ret;
1450     NICInfo *ni;
1451     const char *type;
1452
1453     type = qemu_opt_get(opts, "type");
1454     if (type && g_str_equal(type, "none")) {
1455         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1456     }
1457
1458     idx = nic_get_free_idx();
1459     if (idx == -1 || nb_nics >= MAX_NICS) {
1460         error_setg(errp, "no more on-board/default NIC slots available");
1461         return -1;
1462     }
1463
1464     if (!type) {
1465         qemu_opt_set(opts, "type", "user", &error_abort);
1466     }
1467
1468     ni = &nd_table[idx];
1469     memset(ni, 0, sizeof(*ni));
1470     ni->model = qemu_opt_get_del(opts, "model");
1471
1472     /* Create an ID if the user did not specify one */
1473     nd_id = g_strdup(qemu_opts_id(opts));
1474     if (!nd_id) {
1475         nd_id = id_generate(ID_NET);
1476         qemu_opts_set_id(opts, nd_id);
1477     }
1478
1479     /* Handle MAC address */
1480     mac = qemu_opt_get_del(opts, "mac");
1481     if (mac) {
1482         ret = net_parse_macaddr(ni->macaddr.a, mac);
1483         g_free(mac);
1484         if (ret) {
1485             error_setg(errp, "invalid syntax for ethernet address");
1486             goto out;
1487         }
1488         if (is_multicast_ether_addr(ni->macaddr.a)) {
1489             error_setg(errp, "NIC cannot have multicast MAC address");
1490             ret = -1;
1491             goto out;
1492         }
1493     }
1494     qemu_macaddr_default_if_unset(&ni->macaddr);
1495
1496     ret = net_client_init(opts, true, errp);
1497     if (ret == 0) {
1498         ni->netdev = qemu_find_netdev(nd_id);
1499         ni->used = true;
1500         nb_nics++;
1501     }
1502
1503 out:
1504     g_free(nd_id);
1505     return ret;
1506 }
1507
1508 int net_init_clients(Error **errp)
1509 {
1510     net_change_state_entry =
1511         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1512
1513     QTAILQ_INIT(&net_clients);
1514
1515     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1516                           net_init_netdev, NULL, errp)) {
1517         return -1;
1518     }
1519
1520     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1521         return -1;
1522     }
1523
1524     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1525         return -1;
1526     }
1527
1528     return 0;
1529 }
1530
1531 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1532 {
1533     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1534         return -1;
1535     }
1536
1537     return 0;
1538 }
1539
1540 /* From FreeBSD */
1541 /* XXX: optimize */
1542 uint32_t net_crc32(const uint8_t *p, int len)
1543 {
1544     uint32_t crc;
1545     int carry, i, j;
1546     uint8_t b;
1547
1548     crc = 0xffffffff;
1549     for (i = 0; i < len; i++) {
1550         b = *p++;
1551         for (j = 0; j < 8; j++) {
1552             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1553             crc <<= 1;
1554             b >>= 1;
1555             if (carry) {
1556                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1557             }
1558         }
1559     }
1560
1561     return crc;
1562 }
1563
1564 uint32_t net_crc32_le(const uint8_t *p, int len)
1565 {
1566     uint32_t crc;
1567     int carry, i, j;
1568     uint8_t b;
1569
1570     crc = 0xffffffff;
1571     for (i = 0; i < len; i++) {
1572         b = *p++;
1573         for (j = 0; j < 8; j++) {
1574             carry = (crc & 0x1) ^ (b & 0x01);
1575             crc >>= 1;
1576             b >>= 1;
1577             if (carry) {
1578                 crc ^= POLYNOMIAL_LE;
1579             }
1580         }
1581     }
1582
1583     return crc;
1584 }
1585
1586 QemuOptsList qemu_netdev_opts = {
1587     .name = "netdev",
1588     .implied_opt_name = "type",
1589     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1590     .desc = {
1591         /*
1592          * no elements => accept any params
1593          * validation will happen later
1594          */
1595         { /* end of list */ }
1596     },
1597 };
1598
1599 QemuOptsList qemu_nic_opts = {
1600     .name = "nic",
1601     .implied_opt_name = "type",
1602     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1603     .desc = {
1604         /*
1605          * no elements => accept any params
1606          * validation will happen later
1607          */
1608         { /* end of list */ }
1609     },
1610 };
1611
1612 QemuOptsList qemu_net_opts = {
1613     .name = "net",
1614     .implied_opt_name = "type",
1615     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1616     .desc = {
1617         /*
1618          * no elements => accept any params
1619          * validation will happen later
1620          */
1621         { /* end of list */ }
1622     },
1623 };
1624
1625 void net_socket_rs_init(SocketReadState *rs,
1626                         SocketReadStateFinalize *finalize,
1627                         bool vnet_hdr)
1628 {
1629     rs->state = 0;
1630     rs->vnet_hdr = vnet_hdr;
1631     rs->index = 0;
1632     rs->packet_len = 0;
1633     rs->vnet_hdr_len = 0;
1634     memset(rs->buf, 0, sizeof(rs->buf));
1635     rs->finalize = finalize;
1636 }
1637
1638 /*
1639  * Returns
1640  * 0: success
1641  * -1: error occurs
1642  */
1643 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1644 {
1645     unsigned int l;
1646
1647     while (size > 0) {
1648         /* Reassemble a packet from the network.
1649          * 0 = getting length.
1650          * 1 = getting vnet header length.
1651          * 2 = getting data.
1652          */
1653         switch (rs->state) {
1654         case 0:
1655             l = 4 - rs->index;
1656             if (l > size) {
1657                 l = size;
1658             }
1659             memcpy(rs->buf + rs->index, buf, l);
1660             buf += l;
1661             size -= l;
1662             rs->index += l;
1663             if (rs->index == 4) {
1664                 /* got length */
1665                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1666                 rs->index = 0;
1667                 if (rs->vnet_hdr) {
1668                     rs->state = 1;
1669                 } else {
1670                     rs->state = 2;
1671                     rs->vnet_hdr_len = 0;
1672                 }
1673             }
1674             break;
1675         case 1:
1676             l = 4 - rs->index;
1677             if (l > size) {
1678                 l = size;
1679             }
1680             memcpy(rs->buf + rs->index, buf, l);
1681             buf += l;
1682             size -= l;
1683             rs->index += l;
1684             if (rs->index == 4) {
1685                 /* got vnet header length */
1686                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1687                 rs->index = 0;
1688                 rs->state = 2;
1689             }
1690             break;
1691         case 2:
1692             l = rs->packet_len - rs->index;
1693             if (l > size) {
1694                 l = size;
1695             }
1696             if (rs->index + l <= sizeof(rs->buf)) {
1697                 memcpy(rs->buf + rs->index, buf, l);
1698             } else {
1699                 fprintf(stderr, "serious error: oversized packet received,"
1700                     "connection terminated.\n");
1701                 rs->index = rs->state = 0;
1702                 return -1;
1703             }
1704
1705             rs->index += l;
1706             buf += l;
1707             size -= l;
1708             if (rs->index >= rs->packet_len) {
1709                 rs->index = 0;
1710                 rs->state = 0;
1711                 assert(rs->finalize);
1712                 rs->finalize(rs);
1713             }
1714             break;
1715         }
1716     }
1717
1718     assert(size == 0);
1719     return 0;
1720 }