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