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/main-loop.h"
  48 #include "qemu/option.h"
  49 #include "qapi/error.h"
  50 #include "qapi/opts-visitor.h"
  51 #include "sysemu/sysemu.h"
  52 #include "sysemu/qtest.h"
  53 #include "sysemu/runstate.h"
  54 #include "sysemu/sysemu.h"
  55 #include "net/filter.h"
  56 #include "qapi/string-output-visitor.h"
  57
  58 /* Net bridge is currently not supported for W32. */
  59 #if !defined(_WIN32)
  60 # define CONFIG_NET_BRIDGE
  61 #endif
  62
  63 static VMChangeStateEntry *net_change_state_entry;
  64 static QTAILQ_HEAD(, NetClientState) net_clients;
  65
  66 /***********************************************************/
  67 /* network device redirectors */
  68
  69 int parse_host_port(struct sockaddr_in *saddr, const char *str,
  70                     Error **errp)
  71 {
  72     gchar **substrings;
  73     struct hostent *he;
  74     const char *addr, *p, *r;
  75     int port, ret = 0;
  76
  77     substrings = g_strsplit(str, ":", 2);
  78     if (!substrings || !substrings[0] || !substrings[1]) {
  79         error_setg(errp, "host address '%s' doesn't contain ':' "
  80                    "separating host from port", str);
  81         ret = -1;
  82         goto out;
  83     }
  84
  85     addr = substrings[0];
  86     p = substrings[1];
  87
  88     saddr->sin_family = AF_INET;
  89     if (addr[0] == '\0') {
  90         saddr->sin_addr.s_addr = 0;
  91     } else {
  92         if (qemu_isdigit(addr[0])) {
  93             if (!inet_aton(addr, &saddr->sin_addr)) {
  94                 error_setg(errp, "host address '%s' is not a valid "
  95                            "IPv4 address", addr);
  96                 ret = -1;
  97                 goto out;
  98             }
  99         } else {
 100             he = gethostbyname(addr);
 101             if (he == NULL) {
 102                 error_setg(errp, "can't resolve host address '%s'", addr);
 103                 ret = -1;
 104                 goto out;
 105             }
 106             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 107         }
 108     }
 109     port = strtol(p, (char **)&r, 0);
 110     if (r == p) {
 111         error_setg(errp, "port number '%s' is invalid", p);
 112         ret = -1;
 113         goto out;
 114     }
 115     saddr->sin_port = htons(port);
 116
 117 out:
 118     g_strfreev(substrings);
 119     return ret;
 120 }
 121
 122 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 123 {
 124     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 125                            macaddr[0], macaddr[1], macaddr[2],
 126                            macaddr[3], macaddr[4], macaddr[5]);
 127 }
 128
 129 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 130 {
 131     snprintf(nc->info_str, sizeof(nc->info_str),
 132              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 133              nc->model,
 134              macaddr[0], macaddr[1], macaddr[2],
 135              macaddr[3], macaddr[4], macaddr[5]);
 136 }
 137
 138 static int mac_table[256] = {0};
 139
 140 static void qemu_macaddr_set_used(MACAddr *macaddr)
 141 {
 142     int index;
 143
 144     for (index = 0x56; index < 0xFF; index++) {
 145         if (macaddr->a[5] == index) {
 146             mac_table[index]++;
 147         }
 148     }
 149 }
 150
 151 static void qemu_macaddr_set_free(MACAddr *macaddr)
 152 {
 153     int index;
 154     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 155
 156     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 157         return;
 158     }
 159     for (index = 0x56; index < 0xFF; index++) {
 160         if (macaddr->a[5] == index) {
 161             mac_table[index]--;
 162         }
 163     }
 164 }
 165
 166 static int qemu_macaddr_get_free(void)
 167 {
 168     int index;
 169
 170     for (index = 0x56; index < 0xFF; index++) {
 171         if (mac_table[index] == 0) {
 172             return index;
 173         }
 174     }
 175
 176     return -1;
 177 }
 178
 179 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 180 {
 181     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 182     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 183
 184     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 185         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 186             return;
 187         } else {
 188             qemu_macaddr_set_used(macaddr);
 189             return;
 190         }
 191     }
 192
 193     macaddr->a[0] = 0x52;
 194     macaddr->a[1] = 0x54;
 195     macaddr->a[2] = 0x00;
 196     macaddr->a[3] = 0x12;
 197     macaddr->a[4] = 0x34;
 198     macaddr->a[5] = qemu_macaddr_get_free();
 199     qemu_macaddr_set_used(macaddr);
 200 }
 201
 202 /**
 203  * Generate a name for net client
 204  *
 205  * Only net clients created with the legacy -net option and NICs need this.
 206  */
 207 static char *assign_name(NetClientState *nc1, const char *model)
 208 {
 209     NetClientState *nc;
 210     int id = 0;
 211
 212     QTAILQ_FOREACH(nc, &net_clients, next) {
 213         if (nc == nc1) {
 214             continue;
 215         }
 216         if (strcmp(nc->model, model) == 0) {
 217             id++;
 218         }
 219     }
 220
 221     return g_strdup_printf("%s.%d", model, id);
 222 }
 223
 224 static void qemu_net_client_destructor(NetClientState *nc)
 225 {
 226     g_free(nc);
 227 }
 228 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 229                                        unsigned flags,
 230                                        const struct iovec *iov,
 231                                        int iovcnt,
 232                                        void *opaque);
 233
 234 static void qemu_net_client_setup(NetClientState *nc,
 235                                   NetClientInfo *info,
 236                                   NetClientState *peer,
 237                                   const char *model,
 238                                   const char *name,
 239                                   NetClientDestructor *destructor)
 240 {
 241     nc->info = info;
 242     nc->model = g_strdup(model);
 243     if (name) {
 244         nc->name = g_strdup(name);
 245     } else {
 246         nc->name = assign_name(nc, model);
 247     }
 248
 249     if (peer) {
 250         assert(!peer->peer);
 251         nc->peer = peer;
 252         peer->peer = nc;
 253     }
 254     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 255
 256     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 257     nc->destructor = destructor;
 258     QTAILQ_INIT(&nc->filters);
 259 }
 260
 261 NetClientState *qemu_new_net_client(NetClientInfo *info,
 262                                     NetClientState *peer,
 263                                     const char *model,
 264                                     const char *name)
 265 {
 266     NetClientState *nc;
 267
 268     assert(info->size >= sizeof(NetClientState));
 269
 270     nc = g_malloc0(info->size);
 271     qemu_net_client_setup(nc, info, peer, model, name,
 272                           qemu_net_client_destructor);
 273
 274     return nc;
 275 }
 276
 277 NICState *qemu_new_nic(NetClientInfo *info,
 278                        NICConf *conf,
 279                        const char *model,
 280                        const char *name,
 281                        void *opaque)
 282 {
 283     NetClientState **peers = conf->peers.ncs;
 284     NICState *nic;
 285     int i, queues = MAX(1, conf->peers.queues);
 286
 287     assert(info->type == NET_CLIENT_DRIVER_NIC);
 288     assert(info->size >= sizeof(NICState));
 289
 290     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 291     nic->ncs = (void *)nic + info->size;
 292     nic->conf = conf;
 293     nic->opaque = opaque;
 294
 295     for (i = 0; i < queues; i++) {
 296         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 297                               NULL);
 298         nic->ncs[i].queue_index = i;
 299     }
 300
 301     return nic;
 302 }
 303
 304 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 305 {
 306     return nic->ncs + queue_index;
 307 }
 308
 309 NetClientState *qemu_get_queue(NICState *nic)
 310 {
 311     return qemu_get_subqueue(nic, 0);
 312 }
 313
 314 NICState *qemu_get_nic(NetClientState *nc)
 315 {
 316     NetClientState *nc0 = nc - nc->queue_index;
 317
 318     return (NICState *)((void *)nc0 - nc->info->size);
 319 }
 320
 321 void *qemu_get_nic_opaque(NetClientState *nc)
 322 {
 323     NICState *nic = qemu_get_nic(nc);
 324
 325     return nic->opaque;
 326 }
 327
 328 static void qemu_cleanup_net_client(NetClientState *nc)
 329 {
 330     QTAILQ_REMOVE(&net_clients, nc, next);
 331
 332     if (nc->info->cleanup) {
 333         nc->info->cleanup(nc);
 334     }
 335 }
 336
 337 static void qemu_free_net_client(NetClientState *nc)
 338 {
 339     if (nc->incoming_queue) {
 340         qemu_del_net_queue(nc->incoming_queue);
 341     }
 342     if (nc->peer) {
 343         nc->peer->peer = NULL;
 344     }
 345     g_free(nc->name);
 346     g_free(nc->model);
 347     if (nc->destructor) {
 348         nc->destructor(nc);
 349     }
 350 }
 351
 352 void qemu_del_net_client(NetClientState *nc)
 353 {
 354     NetClientState *ncs[MAX_QUEUE_NUM];
 355     int queues, i;
 356     NetFilterState *nf, *next;
 357
 358     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 359
 360     /* If the NetClientState belongs to a multiqueue backend, we will change all
 361      * other NetClientStates also.
 362      */
 363     queues = qemu_find_net_clients_except(nc->name, ncs,
 364                                           NET_CLIENT_DRIVER_NIC,
 365                                           MAX_QUEUE_NUM);
 366     assert(queues != 0);
 367
 368     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 369         object_unparent(OBJECT(nf));
 370     }
 371
 372     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 373     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 374         NICState *nic = qemu_get_nic(nc->peer);
 375         if (nic->peer_deleted) {
 376             return;
 377         }
 378         nic->peer_deleted = true;
 379
 380         for (i = 0; i < queues; i++) {
 381             ncs[i]->peer->link_down = true;
 382         }
 383
 384         if (nc->peer->info->link_status_changed) {
 385             nc->peer->info->link_status_changed(nc->peer);
 386         }
 387
 388         for (i = 0; i < queues; i++) {
 389             qemu_cleanup_net_client(ncs[i]);
 390         }
 391
 392         return;
 393     }
 394
 395     for (i = 0; i < queues; i++) {
 396         qemu_cleanup_net_client(ncs[i]);
 397         qemu_free_net_client(ncs[i]);
 398     }
 399 }
 400
 401 void qemu_del_nic(NICState *nic)
 402 {
 403     int i, queues = MAX(nic->conf->peers.queues, 1);
 404
 405     qemu_macaddr_set_free(&nic->conf->macaddr);
 406
 407     /* If this is a peer NIC and peer has already been deleted, free it now. */
 408     if (nic->peer_deleted) {
 409         for (i = 0; i < queues; i++) {
 410             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 411         }
 412     }
 413
 414     for (i = queues - 1; i >= 0; i--) {
 415         NetClientState *nc = qemu_get_subqueue(nic, i);
 416
 417         qemu_cleanup_net_client(nc);
 418         qemu_free_net_client(nc);
 419     }
 420
 421     g_free(nic);
 422 }
 423
 424 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 425 {
 426     NetClientState *nc;
 427
 428     QTAILQ_FOREACH(nc, &net_clients, next) {
 429         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 430             if (nc->queue_index == 0) {
 431                 func(qemu_get_nic(nc), opaque);
 432             }
 433         }
 434     }
 435 }
 436
 437 bool qemu_has_ufo(NetClientState *nc)
 438 {
 439     if (!nc || !nc->info->has_ufo) {
 440         return false;
 441     }
 442
 443     return nc->info->has_ufo(nc);
 444 }
 445
 446 bool qemu_has_vnet_hdr(NetClientState *nc)
 447 {
 448     if (!nc || !nc->info->has_vnet_hdr) {
 449         return false;
 450     }
 451
 452     return nc->info->has_vnet_hdr(nc);
 453 }
 454
 455 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 456 {
 457     if (!nc || !nc->info->has_vnet_hdr_len) {
 458         return false;
 459     }
 460
 461     return nc->info->has_vnet_hdr_len(nc, len);
 462 }
 463
 464 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 465 {
 466     if (!nc || !nc->info->using_vnet_hdr) {
 467         return;
 468     }
 469
 470     nc->info->using_vnet_hdr(nc, enable);
 471 }
 472
 473 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 474                           int ecn, int ufo)
 475 {
 476     if (!nc || !nc->info->set_offload) {
 477         return;
 478     }
 479
 480     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 481 }
 482
 483 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 484 {
 485     if (!nc || !nc->info->set_vnet_hdr_len) {
 486         return;
 487     }
 488
 489     nc->vnet_hdr_len = len;
 490     nc->info->set_vnet_hdr_len(nc, len);
 491 }
 492
 493 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 494 {
 495 #ifdef HOST_WORDS_BIGENDIAN
 496     if (!nc || !nc->info->set_vnet_le) {
 497         return -ENOSYS;
 498     }
 499
 500     return nc->info->set_vnet_le(nc, is_le);
 501 #else
 502     return 0;
 503 #endif
 504 }
 505
 506 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 507 {
 508 #ifdef HOST_WORDS_BIGENDIAN
 509     return 0;
 510 #else
 511     if (!nc || !nc->info->set_vnet_be) {
 512         return -ENOSYS;
 513     }
 514
 515     return nc->info->set_vnet_be(nc, is_be);
 516 #endif
 517 }
 518
 519 int qemu_can_send_packet(NetClientState *sender)
 520 {
 521     int vm_running = runstate_is_running();
 522
 523     if (!vm_running) {
 524         return 0;
 525     }
 526
 527     if (!sender->peer) {
 528         return 1;
 529     }
 530
 531     if (sender->peer->receive_disabled) {
 532         return 0;
 533     } else if (sender->peer->info->can_receive &&
 534                !sender->peer->info->can_receive(sender->peer)) {
 535         return 0;
 536     }
 537     return 1;
 538 }
 539
 540 static ssize_t filter_receive_iov(NetClientState *nc,
 541                                   NetFilterDirection direction,
 542                                   NetClientState *sender,
 543                                   unsigned flags,
 544                                   const struct iovec *iov,
 545                                   int iovcnt,
 546                                   NetPacketSent *sent_cb)
 547 {
 548     ssize_t ret = 0;
 549     NetFilterState *nf = NULL;
 550
 551     if (direction == NET_FILTER_DIRECTION_TX) {
 552         QTAILQ_FOREACH(nf, &nc->filters, next) {
 553             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 554                                          iovcnt, sent_cb);
 555             if (ret) {
 556                 return ret;
 557             }
 558         }
 559     } else {
 560         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 561             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 562                                          iovcnt, sent_cb);
 563             if (ret) {
 564                 return ret;
 565             }
 566         }
 567     }
 568
 569     return ret;
 570 }
 571
 572 static ssize_t filter_receive(NetClientState *nc,
 573                               NetFilterDirection direction,
 574                               NetClientState *sender,
 575                               unsigned flags,
 576                               const uint8_t *data,
 577                               size_t size,
 578                               NetPacketSent *sent_cb)
 579 {
 580     struct iovec iov = {
 581         .iov_base = (void *)data,
 582         .iov_len = size
 583     };
 584
 585     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 586 }
 587
 588 void qemu_purge_queued_packets(NetClientState *nc)
 589 {
 590     if (!nc->peer) {
 591         return;
 592     }
 593
 594     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 595 }
 596
 597 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 598 {
 599     nc->receive_disabled = 0;
 600
 601     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 602         if (net_hub_flush(nc->peer)) {
 603             qemu_notify_event();
 604         }
 605     }
 606     if (qemu_net_queue_flush(nc->incoming_queue)) {
 607         /* We emptied the queue successfully, signal to the IO thread to repoll
 608          * the file descriptor (for tap, for example).
 609          */
 610         qemu_notify_event();
 611     } else if (purge) {
 612         /* Unable to empty the queue, purge remaining packets */
 613         qemu_net_queue_purge(nc->incoming_queue, nc);
 614     }
 615 }
 616
 617 void qemu_flush_queued_packets(NetClientState *nc)
 618 {
 619     qemu_flush_or_purge_queued_packets(nc, false);
 620 }
 621
 622 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 623                                                  unsigned flags,
 624                                                  const uint8_t *buf, int size,
 625                                                  NetPacketSent *sent_cb)
 626 {
 627     NetQueue *queue;
 628     int ret;
 629
 630 #ifdef DEBUG_NET
 631     printf("qemu_send_packet_async:\n");
 632     qemu_hexdump((const char *)buf, stdout, "net", size);
 633 #endif
 634
 635     if (sender->link_down || !sender->peer) {
 636         return size;
 637     }
 638
 639     /* Let filters handle the packet first */
 640     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 641                          sender, flags, buf, size, sent_cb);
 642     if (ret) {
 643         return ret;
 644     }
 645
 646     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 647                          sender, flags, buf, size, sent_cb);
 648     if (ret) {
 649         return ret;
 650     }
 651
 652     queue = sender->peer->incoming_queue;
 653
 654     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 655 }
 656
 657 ssize_t qemu_send_packet_async(NetClientState *sender,
 658                                const uint8_t *buf, int size,
 659                                NetPacketSent *sent_cb)
 660 {
 661     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 662                                              buf, size, sent_cb);
 663 }
 664
 665 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 666 {
 667     return qemu_send_packet_async(nc, buf, size, NULL);
 668 }
 669
 670 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 671 {
 672     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 673                                              buf, size, NULL);
 674 }
 675
 676 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 677                                int iovcnt, unsigned flags)
 678 {
 679     uint8_t *buf = NULL;
 680     uint8_t *buffer;
 681     size_t offset;
 682     ssize_t ret;
 683
 684     if (iovcnt == 1) {
 685         buffer = iov[0].iov_base;
 686         offset = iov[0].iov_len;
 687     } else {
 688         offset = iov_size(iov, iovcnt);
 689         if (offset > NET_BUFSIZE) {
 690             return -1;
 691         }
 692         buf = g_malloc(offset);
 693         buffer = buf;
 694         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 695     }
 696
 697     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 698         ret = nc->info->receive_raw(nc, buffer, offset);
 699     } else {
 700         ret = nc->info->receive(nc, buffer, offset);
 701     }
 702
 703     g_free(buf);
 704     return ret;
 705 }
 706
 707 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 708                                        unsigned flags,
 709                                        const struct iovec *iov,
 710                                        int iovcnt,
 711                                        void *opaque)
 712 {
 713     NetClientState *nc = opaque;
 714     int ret;
 715
 716
 717     if (nc->link_down) {
 718         return iov_size(iov, iovcnt);
 719     }
 720
 721     if (nc->receive_disabled) {
 722         return 0;
 723     }
 724
 725     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 726         ret = nc->info->receive_iov(nc, iov, iovcnt);
 727     } else {
 728         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 729     }
 730
 731     if (ret == 0) {
 732         nc->receive_disabled = 1;
 733     }
 734
 735     return ret;
 736 }
 737
 738 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 739                                 const struct iovec *iov, int iovcnt,
 740                                 NetPacketSent *sent_cb)
 741 {
 742     NetQueue *queue;
 743     size_t size = iov_size(iov, iovcnt);
 744     int ret;
 745
 746     if (size > NET_BUFSIZE) {
 747         return size;
 748     }
 749
 750     if (sender->link_down || !sender->peer) {
 751         return size;
 752     }
 753
 754     /* Let filters handle the packet first */
 755     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 756                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 757     if (ret) {
 758         return ret;
 759     }
 760
 761     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 762                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 763     if (ret) {
 764         return ret;
 765     }
 766
 767     queue = sender->peer->incoming_queue;
 768
 769     return qemu_net_queue_send_iov(queue, sender,
 770                                    QEMU_NET_PACKET_FLAG_NONE,
 771                                    iov, iovcnt, sent_cb);
 772 }
 773
 774 ssize_t
 775 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 776 {
 777     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 778 }
 779
 780 NetClientState *qemu_find_netdev(const char *id)
 781 {
 782     NetClientState *nc;
 783
 784     QTAILQ_FOREACH(nc, &net_clients, next) {
 785         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 786             continue;
 787         if (!strcmp(nc->name, id)) {
 788             return nc;
 789         }
 790     }
 791
 792     return NULL;
 793 }
 794
 795 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 796                                  NetClientDriver type, int max)
 797 {
 798     NetClientState *nc;
 799     int ret = 0;
 800
 801     QTAILQ_FOREACH(nc, &net_clients, next) {
 802         if (nc->info->type == type) {
 803             continue;
 804         }
 805         if (!id || !strcmp(nc->name, id)) {
 806             if (ret < max) {
 807                 ncs[ret] = nc;
 808             }
 809             ret++;
 810         }
 811     }
 812
 813     return ret;
 814 }
 815
 816 static int nic_get_free_idx(void)
 817 {
 818     int index;
 819
 820     for (index = 0; index < MAX_NICS; index++)
 821         if (!nd_table[index].used)
 822             return index;
 823     return -1;
 824 }
 825
 826 int qemu_show_nic_models(const char *arg, const char *const *models)
 827 {
 828     int i;
 829
 830     if (!arg || !is_help_option(arg)) {
 831         return 0;
 832     }
 833
 834     printf("Supported NIC models:\n");
 835     for (i = 0 ; models[i]; i++) {
 836         printf("%s\n", models[i]);
 837     }
 838     return 1;
 839 }
 840
 841 void qemu_check_nic_model(NICInfo *nd, const char *model)
 842 {
 843     const char *models[2];
 844
 845     models[0] = model;
 846     models[1] = NULL;
 847
 848     if (qemu_show_nic_models(nd->model, models))
 849         exit(0);
 850     if (qemu_find_nic_model(nd, models, model) < 0)
 851         exit(1);
 852 }
 853
 854 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 855                         const char *default_model)
 856 {
 857     int i;
 858
 859     if (!nd->model)
 860         nd->model = g_strdup(default_model);
 861
 862     for (i = 0 ; models[i]; i++) {
 863         if (strcmp(nd->model, models[i]) == 0)
 864             return i;
 865     }
 866
 867     error_report("Unsupported NIC model: %s", nd->model);
 868     return -1;
 869 }
 870
 871 static int net_init_nic(const Netdev *netdev, const char *name,
 872                         NetClientState *peer, Error **errp)
 873 {
 874     int idx;
 875     NICInfo *nd;
 876     const NetLegacyNicOptions *nic;
 877
 878     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 879     nic = &netdev->u.nic;
 880
 881     idx = nic_get_free_idx();
 882     if (idx == -1 || nb_nics >= MAX_NICS) {
 883         error_setg(errp, "too many NICs");
 884         return -1;
 885     }
 886
 887     nd = &nd_table[idx];
 888
 889     memset(nd, 0, sizeof(*nd));
 890
 891     if (nic->has_netdev) {
 892         nd->netdev = qemu_find_netdev(nic->netdev);
 893         if (!nd->netdev) {
 894             error_setg(errp, "netdev '%s' not found", nic->netdev);
 895             return -1;
 896         }
 897     } else {
 898         assert(peer);
 899         nd->netdev = peer;
 900     }
 901     nd->name = g_strdup(name);
 902     if (nic->has_model) {
 903         nd->model = g_strdup(nic->model);
 904     }
 905     if (nic->has_addr) {
 906         nd->devaddr = g_strdup(nic->addr);
 907     }
 908
 909     if (nic->has_macaddr &&
 910         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 911         error_setg(errp, "invalid syntax for ethernet address");
 912         return -1;
 913     }
 914     if (nic->has_macaddr &&
 915         is_multicast_ether_addr(nd->macaddr.a)) {
 916         error_setg(errp,
 917                    "NIC cannot have multicast MAC address (odd 1st byte)");
 918         return -1;
 919     }
 920     qemu_macaddr_default_if_unset(&nd->macaddr);
 921
 922     if (nic->has_vectors) {
 923         if (nic->vectors > 0x7ffffff) {
 924             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 925             return -1;
 926         }
 927         nd->nvectors = nic->vectors;
 928     } else {
 929         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 930     }
 931
 932     nd->used = 1;
 933     nb_nics++;
 934
 935     return idx;
 936 }
 937
 938
 939 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 940     const Netdev *netdev,
 941     const char *name,
 942     NetClientState *peer, Error **errp) = {
 943         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 944 #ifdef CONFIG_SLIRP
 945         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 946 #endif
 947         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 948         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 949 #ifdef CONFIG_VDE
 950         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 951 #endif
 952 #ifdef CONFIG_NETMAP
 953         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 954 #endif
 955 #ifdef CONFIG_NET_BRIDGE
 956         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 957 #endif
 958         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 959 #ifdef CONFIG_VHOST_NET_USER
 960         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 961 #endif
 962 #ifdef CONFIG_L2TPV3
 963         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 964 #endif
 965 };
 966
 967
 968 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 969 {
 970     Netdev legacy = {0};
 971     const Netdev *netdev;
 972     const char *name;
 973     NetClientState *peer = NULL;
 974
 975     if (is_netdev) {
 976         netdev = object;
 977         name = netdev->id;
 978
 979         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
 980             !net_client_init_fun[netdev->type]) {
 981             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 982                        "a netdev backend type");
 983             return -1;
 984         }
 985     } else {
 986         const NetLegacy *net = object;
 987         const NetLegacyOptions *opts = net->opts;
 988         legacy.id = net->id;
 989         netdev = &legacy;
 990         /* missing optional values have been initialized to "all bits zero" */
 991         name = net->has_id ? net->id : net->name;
 992
 993         if (net->has_name) {
 994             warn_report("The 'name' parameter is deprecated, use 'id' instead");
 995         }
 996
 997         /* Map the old options to the new flat type */
 998         switch (opts->type) {
 999         case NET_LEGACY_OPTIONS_TYPE_NONE:
1000             return 0; /* nothing to do */
1001         case NET_LEGACY_OPTIONS_TYPE_NIC:
1002             legacy.type = NET_CLIENT_DRIVER_NIC;
1003             legacy.u.nic = opts->u.nic;
1004             break;
1005         case NET_LEGACY_OPTIONS_TYPE_USER:
1006             legacy.type = NET_CLIENT_DRIVER_USER;
1007             legacy.u.user = opts->u.user;
1008             break;
1009         case NET_LEGACY_OPTIONS_TYPE_TAP:
1010             legacy.type = NET_CLIENT_DRIVER_TAP;
1011             legacy.u.tap = opts->u.tap;
1012             break;
1013         case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1014             legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1015             legacy.u.l2tpv3 = opts->u.l2tpv3;
1016             break;
1017         case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1018             legacy.type = NET_CLIENT_DRIVER_SOCKET;
1019             legacy.u.socket = opts->u.socket;
1020             break;
1021         case NET_LEGACY_OPTIONS_TYPE_VDE:
1022             legacy.type = NET_CLIENT_DRIVER_VDE;
1023             legacy.u.vde = opts->u.vde;
1024             break;
1025         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1026             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1027             legacy.u.bridge = opts->u.bridge;
1028             break;
1029         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1030             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1031             legacy.u.netmap = opts->u.netmap;
1032             break;
1033         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1034             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1035             legacy.u.vhost_user = opts->u.vhost_user;
1036             break;
1037         default:
1038             abort();
1039         }
1040
1041         if (!net_client_init_fun[netdev->type]) {
1042             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1043                        "a net backend type (maybe it is not compiled "
1044                        "into this binary)");
1045             return -1;
1046         }
1047
1048         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1049         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1050             !opts->u.nic.has_netdev) {
1051             peer = net_hub_add_port(0, NULL, NULL);
1052         }
1053     }
1054
1055     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1056         /* FIXME drop when all init functions store an Error */
1057         if (errp && !*errp) {
1058             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1059                        NetClientDriver_str(netdev->type));
1060         }
1061         return -1;
1062     }
1063
1064     if (is_netdev) {
1065         NetClientState *nc;
1066
1067         nc = qemu_find_netdev(netdev->id);
1068         assert(nc);
1069         nc->is_netdev = true;
1070     }
1071
1072     return 0;
1073 }
1074
1075 static void show_netdevs(void)
1076 {
1077     int idx;
1078     const char *available_netdevs[] = {
1079         "socket",
1080         "hubport",
1081         "tap",
1082 #ifdef CONFIG_SLIRP
1083         "user",
1084 #endif
1085 #ifdef CONFIG_L2TPV3
1086         "l2tpv3",
1087 #endif
1088 #ifdef CONFIG_VDE
1089         "vde",
1090 #endif
1091 #ifdef CONFIG_NET_BRIDGE
1092         "bridge",
1093 #endif
1094 #ifdef CONFIG_NETMAP
1095         "netmap",
1096 #endif
1097 #ifdef CONFIG_POSIX
1098         "vhost-user",
1099 #endif
1100     };
1101
1102     printf("Available netdev backend types:\n");
1103     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1104         puts(available_netdevs[idx]);
1105     }
1106 }
1107
1108 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1109 {
1110     gchar **substrings = NULL;
1111     void *object = NULL;
1112     Error *err = NULL;
1113     int ret = -1;
1114     Visitor *v = opts_visitor_new(opts);
1115
1116     const char *type = qemu_opt_get(opts, "type");
1117
1118     if (is_netdev && type && is_help_option(type)) {
1119         show_netdevs();
1120         exit(0);
1121     } else {
1122         /* Parse convenience option format ip6-net=fec0::0[/64] */
1123         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1124
1125         if (ip6_net) {
1126             char *prefix_addr;
1127             unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1128
1129             substrings = g_strsplit(ip6_net, "/", 2);
1130             if (!substrings || !substrings[0]) {
1131                 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1132                            "a valid IPv6 prefix");
1133                 goto out;
1134             }
1135
1136             prefix_addr = substrings[0];
1137
1138             /* Handle user-specified prefix length. */
1139             if (substrings[1] &&
1140                 qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1141             {
1142                 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1143                            "ipv6-prefixlen", "a number");
1144                 goto out;
1145             }
1146
1147             qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1148             qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1149                                 &error_abort);
1150             qemu_opt_unset(opts, "ipv6-net");
1151         }
1152     }
1153
1154     if (is_netdev) {
1155         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1156     } else {
1157         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1158     }
1159
1160     if (!err) {
1161         ret = net_client_init1(object, is_netdev, &err);
1162     }
1163
1164     if (is_netdev) {
1165         qapi_free_Netdev(object);
1166     } else {
1167         qapi_free_NetLegacy(object);
1168     }
1169
1170 out:
1171     error_propagate(errp, err);
1172     g_strfreev(substrings);
1173     visit_free(v);
1174     return ret;
1175 }
1176
1177 void netdev_add(QemuOpts *opts, Error **errp)
1178 {
1179     net_client_init(opts, true, errp);
1180 }
1181
1182 void qmp_netdev_add(Netdev *netdev, Error **errp)
1183 {
1184     net_client_init1(netdev, true, errp);
1185 }
1186
1187 void qmp_netdev_del(const char *id, Error **errp)
1188 {
1189     NetClientState *nc;
1190
1191     nc = qemu_find_netdev(id);
1192     if (!nc) {
1193         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1194                   "Device '%s' not found", id);
1195         return;
1196     }
1197
1198     if (!nc->is_netdev) {
1199         error_setg(errp, "Device '%s' is not a netdev", id);
1200         return;
1201     }
1202
1203     qemu_del_net_client(nc);
1204 }
1205
1206 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1207 {
1208     char *str;
1209     ObjectProperty *prop;
1210     ObjectPropertyIterator iter;
1211     Visitor *v;
1212
1213     /* generate info str */
1214     object_property_iter_init(&iter, OBJECT(nf));
1215     while ((prop = object_property_iter_next(&iter))) {
1216         if (!strcmp(prop->name, "type")) {
1217             continue;
1218         }
1219         v = string_output_visitor_new(false, &str);
1220         object_property_get(OBJECT(nf), v, prop->name, NULL);
1221         visit_complete(v, &str);
1222         visit_free(v);
1223         monitor_printf(mon, ",%s=%s", prop->name, str);
1224         g_free(str);
1225     }
1226     monitor_printf(mon, "\n");
1227 }
1228
1229 void print_net_client(Monitor *mon, NetClientState *nc)
1230 {
1231     NetFilterState *nf;
1232
1233     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1234                    nc->queue_index,
1235                    NetClientDriver_str(nc->info->type),
1236                    nc->info_str);
1237     if (!QTAILQ_EMPTY(&nc->filters)) {
1238         monitor_printf(mon, "filters:\n");
1239     }
1240     QTAILQ_FOREACH(nf, &nc->filters, next) {
1241         char *path = object_get_canonical_path_component(OBJECT(nf));
1242
1243         monitor_printf(mon, "  - %s: type=%s", path,
1244                        object_get_typename(OBJECT(nf)));
1245         netfilter_print_info(mon, nf);
1246         g_free(path);
1247     }
1248 }
1249
1250 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1251                                       Error **errp)
1252 {
1253     NetClientState *nc;
1254     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1255
1256     QTAILQ_FOREACH(nc, &net_clients, next) {
1257         RxFilterInfoList *entry;
1258         RxFilterInfo *info;
1259
1260         if (has_name && strcmp(nc->name, name) != 0) {
1261             continue;
1262         }
1263
1264         /* only query rx-filter information of NIC */
1265         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1266             if (has_name) {
1267                 error_setg(errp, "net client(%s) isn't a NIC", name);
1268                 return NULL;
1269             }
1270             continue;
1271         }
1272
1273         /* only query information on queue 0 since the info is per nic,
1274          * not per queue
1275          */
1276         if (nc->queue_index != 0)
1277             continue;
1278
1279         if (nc->info->query_rx_filter) {
1280             info = nc->info->query_rx_filter(nc);
1281             entry = g_malloc0(sizeof(*entry));
1282             entry->value = info;
1283
1284             if (!filter_list) {
1285                 filter_list = entry;
1286             } else {
1287                 last_entry->next = entry;
1288             }
1289             last_entry = entry;
1290         } else if (has_name) {
1291             error_setg(errp, "net client(%s) doesn't support"
1292                        " rx-filter querying", name);
1293             return NULL;
1294         }
1295
1296         if (has_name) {
1297             break;
1298         }
1299     }
1300
1301     if (filter_list == NULL && has_name) {
1302         error_setg(errp, "invalid net client name: %s", name);
1303     }
1304
1305     return filter_list;
1306 }
1307
1308 void hmp_info_network(Monitor *mon, const QDict *qdict)
1309 {
1310     NetClientState *nc, *peer;
1311     NetClientDriver type;
1312
1313     net_hub_info(mon);
1314
1315     QTAILQ_FOREACH(nc, &net_clients, next) {
1316         peer = nc->peer;
1317         type = nc->info->type;
1318
1319         /* Skip if already printed in hub info */
1320         if (net_hub_id_for_client(nc, NULL) == 0) {
1321             continue;
1322         }
1323
1324         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1325             print_net_client(mon, nc);
1326         } /* else it's a netdev connected to a NIC, printed with the NIC */
1327         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1328             monitor_printf(mon, " \\ ");
1329             print_net_client(mon, peer);
1330         }
1331     }
1332 }
1333
1334 void colo_notify_filters_event(int event, Error **errp)
1335 {
1336     NetClientState *nc;
1337     NetFilterState *nf;
1338     NetFilterClass *nfc = NULL;
1339     Error *local_err = NULL;
1340
1341     QTAILQ_FOREACH(nc, &net_clients, next) {
1342         QTAILQ_FOREACH(nf, &nc->filters, next) {
1343             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1344             nfc->handle_event(nf, event, &local_err);
1345             if (local_err) {
1346                 error_propagate(errp, local_err);
1347                 return;
1348             }
1349         }
1350     }
1351 }
1352
1353 void qmp_set_link(const char *name, bool up, Error **errp)
1354 {
1355     NetClientState *ncs[MAX_QUEUE_NUM];
1356     NetClientState *nc;
1357     int queues, i;
1358
1359     queues = qemu_find_net_clients_except(name, ncs,
1360                                           NET_CLIENT_DRIVER__MAX,
1361                                           MAX_QUEUE_NUM);
1362
1363     if (queues == 0) {
1364         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1365                   "Device '%s' not found", name);
1366         return;
1367     }
1368     nc = ncs[0];
1369
1370     for (i = 0; i < queues; i++) {
1371         ncs[i]->link_down = !up;
1372     }
1373
1374     if (nc->info->link_status_changed) {
1375         nc->info->link_status_changed(nc);
1376     }
1377
1378     if (nc->peer) {
1379         /* Change peer link only if the peer is NIC and then notify peer.
1380          * If the peer is a HUBPORT or a backend, we do not change the
1381          * link status.
1382          *
1383          * This behavior is compatible with qemu hubs where there could be
1384          * multiple clients that can still communicate with each other in
1385          * disconnected mode. For now maintain this compatibility.
1386          */
1387         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1388             for (i = 0; i < queues; i++) {
1389                 ncs[i]->peer->link_down = !up;
1390             }
1391         }
1392         if (nc->peer->info->link_status_changed) {
1393             nc->peer->info->link_status_changed(nc->peer);
1394         }
1395     }
1396 }
1397
1398 static void net_vm_change_state_handler(void *opaque, int running,
1399                                         RunState state)
1400 {
1401     NetClientState *nc;
1402     NetClientState *tmp;
1403
1404     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1405         if (running) {
1406             /* Flush queued packets and wake up backends. */
1407             if (nc->peer && qemu_can_send_packet(nc)) {
1408                 qemu_flush_queued_packets(nc->peer);
1409             }
1410         } else {
1411             /* Complete all queued packets, to guarantee we don't modify
1412              * state later when VM is not running.
1413              */
1414             qemu_flush_or_purge_queued_packets(nc, true);
1415         }
1416     }
1417 }
1418
1419 void net_cleanup(void)
1420 {
1421     NetClientState *nc;
1422
1423     /* We may del multiple entries during qemu_del_net_client(),
1424      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1425      */
1426     while (!QTAILQ_EMPTY(&net_clients)) {
1427         nc = QTAILQ_FIRST(&net_clients);
1428         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1429             qemu_del_nic(qemu_get_nic(nc));
1430         } else {
1431             qemu_del_net_client(nc);
1432         }
1433     }
1434
1435     qemu_del_vm_change_state_handler(net_change_state_entry);
1436 }
1437
1438 void net_check_clients(void)
1439 {
1440     NetClientState *nc;
1441     int i;
1442
1443     net_hub_check_clients();
1444
1445     QTAILQ_FOREACH(nc, &net_clients, next) {
1446         if (!nc->peer) {
1447             warn_report("%s %s has no peer",
1448                         nc->info->type == NET_CLIENT_DRIVER_NIC
1449                         ? "nic" : "netdev",
1450                         nc->name);
1451         }
1452     }
1453
1454     /* Check that all NICs requested via -net nic actually got created.
1455      * NICs created via -device don't need to be checked here because
1456      * they are always instantiated.
1457      */
1458     for (i = 0; i < MAX_NICS; i++) {
1459         NICInfo *nd = &nd_table[i];
1460         if (nd->used && !nd->instantiated) {
1461             warn_report("requested NIC (%s, model %s) "
1462                         "was not created (not supported by this machine?)",
1463                         nd->name ? nd->name : "anonymous",
1464                         nd->model ? nd->model : "unspecified");
1465         }
1466     }
1467 }
1468
1469 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1470 {
1471     return net_client_init(opts, false, errp);
1472 }
1473
1474 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1475 {
1476     return net_client_init(opts, true, errp);
1477 }
1478
1479 /* For the convenience "--nic" parameter */
1480 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1481 {
1482     char *mac, *nd_id;
1483     int idx, ret;
1484     NICInfo *ni;
1485     const char *type;
1486
1487     type = qemu_opt_get(opts, "type");
1488     if (type && g_str_equal(type, "none")) {
1489         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1490     }
1491
1492     idx = nic_get_free_idx();
1493     if (idx == -1 || nb_nics >= MAX_NICS) {
1494         error_setg(errp, "no more on-board/default NIC slots available");
1495         return -1;
1496     }
1497
1498     if (!type) {
1499         qemu_opt_set(opts, "type", "user", &error_abort);
1500     }
1501
1502     ni = &nd_table[idx];
1503     memset(ni, 0, sizeof(*ni));
1504     ni->model = qemu_opt_get_del(opts, "model");
1505
1506     /* Create an ID if the user did not specify one */
1507     nd_id = g_strdup(qemu_opts_id(opts));
1508     if (!nd_id) {
1509         nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1510         qemu_opts_set_id(opts, nd_id);
1511     }
1512
1513     /* Handle MAC address */
1514     mac = qemu_opt_get_del(opts, "mac");
1515     if (mac) {
1516         ret = net_parse_macaddr(ni->macaddr.a, mac);
1517         g_free(mac);
1518         if (ret) {
1519             error_setg(errp, "invalid syntax for ethernet address");
1520             goto out;
1521         }
1522         if (is_multicast_ether_addr(ni->macaddr.a)) {
1523             error_setg(errp, "NIC cannot have multicast MAC address");
1524             ret = -1;
1525             goto out;
1526         }
1527     }
1528     qemu_macaddr_default_if_unset(&ni->macaddr);
1529
1530     ret = net_client_init(opts, true, errp);
1531     if (ret == 0) {
1532         ni->netdev = qemu_find_netdev(nd_id);
1533         ni->used = true;
1534         nb_nics++;
1535     }
1536
1537 out:
1538     g_free(nd_id);
1539     return ret;
1540 }
1541
1542 int net_init_clients(Error **errp)
1543 {
1544     net_change_state_entry =
1545         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1546
1547     QTAILQ_INIT(&net_clients);
1548
1549     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1550                           net_init_netdev, NULL, errp)) {
1551         return -1;
1552     }
1553
1554     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1555         return -1;
1556     }
1557
1558     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1559         return -1;
1560     }
1561
1562     return 0;
1563 }
1564
1565 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1566 {
1567     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1568         return -1;
1569     }
1570
1571     return 0;
1572 }
1573
1574 /* From FreeBSD */
1575 /* XXX: optimize */
1576 uint32_t net_crc32(const uint8_t *p, int len)
1577 {
1578     uint32_t crc;
1579     int carry, i, j;
1580     uint8_t b;
1581
1582     crc = 0xffffffff;
1583     for (i = 0; i < len; i++) {
1584         b = *p++;
1585         for (j = 0; j < 8; j++) {
1586             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1587             crc <<= 1;
1588             b >>= 1;
1589             if (carry) {
1590                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1591             }
1592         }
1593     }
1594
1595     return crc;
1596 }
1597
1598 uint32_t net_crc32_le(const uint8_t *p, int len)
1599 {
1600     uint32_t crc;
1601     int carry, i, j;
1602     uint8_t b;
1603
1604     crc = 0xffffffff;
1605     for (i = 0; i < len; i++) {
1606         b = *p++;
1607         for (j = 0; j < 8; j++) {
1608             carry = (crc & 0x1) ^ (b & 0x01);
1609             crc >>= 1;
1610             b >>= 1;
1611             if (carry) {
1612                 crc ^= POLYNOMIAL_LE;
1613             }
1614         }
1615     }
1616
1617     return crc;
1618 }
1619
1620 QemuOptsList qemu_netdev_opts = {
1621     .name = "netdev",
1622     .implied_opt_name = "type",
1623     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1624     .desc = {
1625         /*
1626          * no elements => accept any params
1627          * validation will happen later
1628          */
1629         { /* end of list */ }
1630     },
1631 };
1632
1633 QemuOptsList qemu_nic_opts = {
1634     .name = "nic",
1635     .implied_opt_name = "type",
1636     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1637     .desc = {
1638         /*
1639          * no elements => accept any params
1640          * validation will happen later
1641          */
1642         { /* end of list */ }
1643     },
1644 };
1645
1646 QemuOptsList qemu_net_opts = {
1647     .name = "net",
1648     .implied_opt_name = "type",
1649     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1650     .desc = {
1651         /*
1652          * no elements => accept any params
1653          * validation will happen later
1654          */
1655         { /* end of list */ }
1656     },
1657 };
1658
1659 void net_socket_rs_init(SocketReadState *rs,
1660                         SocketReadStateFinalize *finalize,
1661                         bool vnet_hdr)
1662 {
1663     rs->state = 0;
1664     rs->vnet_hdr = vnet_hdr;
1665     rs->index = 0;
1666     rs->packet_len = 0;
1667     rs->vnet_hdr_len = 0;
1668     memset(rs->buf, 0, sizeof(rs->buf));
1669     rs->finalize = finalize;
1670 }
1671
1672 /*
1673  * Returns
1674  * 0: success
1675  * -1: error occurs
1676  */
1677 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1678 {
1679     unsigned int l;
1680
1681     while (size > 0) {
1682         /* Reassemble a packet from the network.
1683          * 0 = getting length.
1684          * 1 = getting vnet header length.
1685          * 2 = getting data.
1686          */
1687         switch (rs->state) {
1688         case 0:
1689             l = 4 - rs->index;
1690             if (l > size) {
1691                 l = size;
1692             }
1693             memcpy(rs->buf + rs->index, buf, l);
1694             buf += l;
1695             size -= l;
1696             rs->index += l;
1697             if (rs->index == 4) {
1698                 /* got length */
1699                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1700                 rs->index = 0;
1701                 if (rs->vnet_hdr) {
1702                     rs->state = 1;
1703                 } else {
1704                     rs->state = 2;
1705                     rs->vnet_hdr_len = 0;
1706                 }
1707             }
1708             break;
1709         case 1:
1710             l = 4 - rs->index;
1711             if (l > size) {
1712                 l = size;
1713             }
1714             memcpy(rs->buf + rs->index, buf, l);
1715             buf += l;
1716             size -= l;
1717             rs->index += l;
1718             if (rs->index == 4) {
1719                 /* got vnet header length */
1720                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1721                 rs->index = 0;
1722                 rs->state = 2;
1723             }
1724             break;
1725         case 2:
1726             l = rs->packet_len - rs->index;
1727             if (l > size) {
1728                 l = size;
1729             }
1730             if (rs->index + l <= sizeof(rs->buf)) {
1731                 memcpy(rs->buf + rs->index, buf, l);
1732             } else {
1733                 fprintf(stderr, "serious error: oversized packet received,"
1734                     "connection terminated.\n");
1735                 rs->index = rs->state = 0;
1736                 return -1;
1737             }
1738
1739             rs->index += l;
1740             buf += l;
1741             size -= l;
1742             if (rs->index >= rs->packet_len) {
1743                 rs->index = 0;
1744                 rs->state = 0;
1745                 assert(rs->finalize);
1746                 rs->finalize(rs);
1747             }
1748             break;
1749         }
1750     }
1751
1752     assert(size == 0);
1753     return 0;
1754 }