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     memset(saddr, 0, sizeof(*saddr));
  79
  80     substrings = g_strsplit(str, ":", 2);
  81     if (!substrings || !substrings[0] || !substrings[1]) {
  82         error_setg(errp, "host address '%s' doesn't contain ':' "
  83                    "separating host from port", str);
  84         ret = -1;
  85         goto out;
  86     }
  87
  88     addr = substrings[0];
  89     p = substrings[1];
  90
  91     saddr->sin_family = AF_INET;
  92     if (addr[0] == '\0') {
  93         saddr->sin_addr.s_addr = 0;
  94     } else {
  95         if (qemu_isdigit(addr[0])) {
  96             if (!inet_aton(addr, &saddr->sin_addr)) {
  97                 error_setg(errp, "host address '%s' is not a valid "
  98                            "IPv4 address", addr);
  99                 ret = -1;
 100                 goto out;
 101             }
 102         } else {
 103             he = gethostbyname(addr);
 104             if (he == NULL) {
 105                 error_setg(errp, "can't resolve host address '%s'", addr);
 106                 ret = -1;
 107                 goto out;
 108             }
 109             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 110         }
 111     }
 112     port = strtol(p, (char **)&r, 0);
 113     if (r == p) {
 114         error_setg(errp, "port number '%s' is invalid", p);
 115         ret = -1;
 116         goto out;
 117     }
 118     saddr->sin_port = htons(port);
 119
 120 out:
 121     g_strfreev(substrings);
 122     return ret;
 123 }
 124
 125 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 126 {
 127     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 128                            macaddr[0], macaddr[1], macaddr[2],
 129                            macaddr[3], macaddr[4], macaddr[5]);
 130 }
 131
 132 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 133 {
 134     snprintf(nc->info_str, sizeof(nc->info_str),
 135              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 136              nc->model,
 137              macaddr[0], macaddr[1], macaddr[2],
 138              macaddr[3], macaddr[4], macaddr[5]);
 139 }
 140
 141 static int mac_table[256] = {0};
 142
 143 static void qemu_macaddr_set_used(MACAddr *macaddr)
 144 {
 145     int index;
 146
 147     for (index = 0x56; index < 0xFF; index++) {
 148         if (macaddr->a[5] == index) {
 149             mac_table[index]++;
 150         }
 151     }
 152 }
 153
 154 static void qemu_macaddr_set_free(MACAddr *macaddr)
 155 {
 156     int index;
 157     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 158
 159     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 160         return;
 161     }
 162     for (index = 0x56; index < 0xFF; index++) {
 163         if (macaddr->a[5] == index) {
 164             mac_table[index]--;
 165         }
 166     }
 167 }
 168
 169 static int qemu_macaddr_get_free(void)
 170 {
 171     int index;
 172
 173     for (index = 0x56; index < 0xFF; index++) {
 174         if (mac_table[index] == 0) {
 175             return index;
 176         }
 177     }
 178
 179     return -1;
 180 }
 181
 182 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 183 {
 184     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 185     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 186
 187     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 188         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 189             return;
 190         } else {
 191             qemu_macaddr_set_used(macaddr);
 192             return;
 193         }
 194     }
 195
 196     macaddr->a[0] = 0x52;
 197     macaddr->a[1] = 0x54;
 198     macaddr->a[2] = 0x00;
 199     macaddr->a[3] = 0x12;
 200     macaddr->a[4] = 0x34;
 201     macaddr->a[5] = qemu_macaddr_get_free();
 202     qemu_macaddr_set_used(macaddr);
 203 }
 204
 205 /**
 206  * Generate a name for net client
 207  *
 208  * Only net clients created with the legacy -net option and NICs need this.
 209  */
 210 static char *assign_name(NetClientState *nc1, const char *model)
 211 {
 212     NetClientState *nc;
 213     int id = 0;
 214
 215     QTAILQ_FOREACH(nc, &net_clients, next) {
 216         if (nc == nc1) {
 217             continue;
 218         }
 219         if (strcmp(nc->model, model) == 0) {
 220             id++;
 221         }
 222     }
 223
 224     return g_strdup_printf("%s.%d", model, id);
 225 }
 226
 227 static void qemu_net_client_destructor(NetClientState *nc)
 228 {
 229     g_free(nc);
 230 }
 231 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 232                                        unsigned flags,
 233                                        const struct iovec *iov,
 234                                        int iovcnt,
 235                                        void *opaque);
 236
 237 static void qemu_net_client_setup(NetClientState *nc,
 238                                   NetClientInfo *info,
 239                                   NetClientState *peer,
 240                                   const char *model,
 241                                   const char *name,
 242                                   NetClientDestructor *destructor,
 243                                   bool is_datapath)
 244 {
 245     nc->info = info;
 246     nc->model = g_strdup(model);
 247     if (name) {
 248         nc->name = g_strdup(name);
 249     } else {
 250         nc->name = assign_name(nc, model);
 251     }
 252
 253     if (peer) {
 254         assert(!peer->peer);
 255         nc->peer = peer;
 256         peer->peer = nc;
 257     }
 258     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 259
 260     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 261     nc->destructor = destructor;
 262     nc->is_datapath = is_datapath;
 263     QTAILQ_INIT(&nc->filters);
 264 }
 265
 266 NetClientState *qemu_new_net_client(NetClientInfo *info,
 267                                     NetClientState *peer,
 268                                     const char *model,
 269                                     const char *name)
 270 {
 271     NetClientState *nc;
 272
 273     assert(info->size >= sizeof(NetClientState));
 274
 275     nc = g_malloc0(info->size);
 276     qemu_net_client_setup(nc, info, peer, model, name,
 277                           qemu_net_client_destructor, true);
 278
 279     return nc;
 280 }
 281
 282 NetClientState *qemu_new_net_control_client(NetClientInfo *info,
 283                                             NetClientState *peer,
 284                                             const char *model,
 285                                             const char *name)
 286 {
 287     NetClientState *nc;
 288
 289     assert(info->size >= sizeof(NetClientState));
 290
 291     nc = g_malloc0(info->size);
 292     qemu_net_client_setup(nc, info, peer, model, name,
 293                           qemu_net_client_destructor, false);
 294
 295     return nc;
 296 }
 297
 298 NICState *qemu_new_nic(NetClientInfo *info,
 299                        NICConf *conf,
 300                        const char *model,
 301                        const char *name,
 302                        void *opaque)
 303 {
 304     NetClientState **peers = conf->peers.ncs;
 305     NICState *nic;
 306     int i, queues = MAX(1, conf->peers.queues);
 307
 308     assert(info->type == NET_CLIENT_DRIVER_NIC);
 309     assert(info->size >= sizeof(NICState));
 310
 311     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 312     nic->ncs = (void *)nic + info->size;
 313     nic->conf = conf;
 314     nic->opaque = opaque;
 315
 316     for (i = 0; i < queues; i++) {
 317         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 318                               NULL, true);
 319         nic->ncs[i].queue_index = i;
 320     }
 321
 322     return nic;
 323 }
 324
 325 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 326 {
 327     return nic->ncs + queue_index;
 328 }
 329
 330 NetClientState *qemu_get_queue(NICState *nic)
 331 {
 332     return qemu_get_subqueue(nic, 0);
 333 }
 334
 335 NICState *qemu_get_nic(NetClientState *nc)
 336 {
 337     NetClientState *nc0 = nc - nc->queue_index;
 338
 339     return (NICState *)((void *)nc0 - nc->info->size);
 340 }
 341
 342 void *qemu_get_nic_opaque(NetClientState *nc)
 343 {
 344     NICState *nic = qemu_get_nic(nc);
 345
 346     return nic->opaque;
 347 }
 348
 349 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
 350 {
 351     assert(nc != NULL);
 352     NetClientState *ncs = nc + queue_index;
 353     return ncs->peer;
 354 }
 355
 356 static void qemu_cleanup_net_client(NetClientState *nc)
 357 {
 358     QTAILQ_REMOVE(&net_clients, nc, next);
 359
 360     if (nc->info->cleanup) {
 361         nc->info->cleanup(nc);
 362     }
 363 }
 364
 365 static void qemu_free_net_client(NetClientState *nc)
 366 {
 367     if (nc->incoming_queue) {
 368         qemu_del_net_queue(nc->incoming_queue);
 369     }
 370     if (nc->peer) {
 371         nc->peer->peer = NULL;
 372     }
 373     g_free(nc->name);
 374     g_free(nc->model);
 375     if (nc->destructor) {
 376         nc->destructor(nc);
 377     }
 378 }
 379
 380 void qemu_del_net_client(NetClientState *nc)
 381 {
 382     NetClientState *ncs[MAX_QUEUE_NUM];
 383     int queues, i;
 384     NetFilterState *nf, *next;
 385
 386     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 387
 388     /* If the NetClientState belongs to a multiqueue backend, we will change all
 389      * other NetClientStates also.
 390      */
 391     queues = qemu_find_net_clients_except(nc->name, ncs,
 392                                           NET_CLIENT_DRIVER_NIC,
 393                                           MAX_QUEUE_NUM);
 394     assert(queues != 0);
 395
 396     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 397         object_unparent(OBJECT(nf));
 398     }
 399
 400     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 401     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 402         NICState *nic = qemu_get_nic(nc->peer);
 403         if (nic->peer_deleted) {
 404             return;
 405         }
 406         nic->peer_deleted = true;
 407
 408         for (i = 0; i < queues; i++) {
 409             ncs[i]->peer->link_down = true;
 410         }
 411
 412         if (nc->peer->info->link_status_changed) {
 413             nc->peer->info->link_status_changed(nc->peer);
 414         }
 415
 416         for (i = 0; i < queues; i++) {
 417             qemu_cleanup_net_client(ncs[i]);
 418         }
 419
 420         return;
 421     }
 422
 423     for (i = 0; i < queues; i++) {
 424         qemu_cleanup_net_client(ncs[i]);
 425         qemu_free_net_client(ncs[i]);
 426     }
 427 }
 428
 429 void qemu_del_nic(NICState *nic)
 430 {
 431     int i, queues = MAX(nic->conf->peers.queues, 1);
 432
 433     qemu_macaddr_set_free(&nic->conf->macaddr);
 434
 435     for (i = 0; i < queues; i++) {
 436         NetClientState *nc = qemu_get_subqueue(nic, i);
 437         /* If this is a peer NIC and peer has already been deleted, free it now. */
 438         if (nic->peer_deleted) {
 439             qemu_free_net_client(nc->peer);
 440         } else if (nc->peer) {
 441             /* if there are RX packets pending, complete them */
 442             qemu_purge_queued_packets(nc->peer);
 443         }
 444     }
 445
 446     for (i = queues - 1; i >= 0; i--) {
 447         NetClientState *nc = qemu_get_subqueue(nic, i);
 448
 449         qemu_cleanup_net_client(nc);
 450         qemu_free_net_client(nc);
 451     }
 452
 453     g_free(nic);
 454 }
 455
 456 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 457 {
 458     NetClientState *nc;
 459
 460     QTAILQ_FOREACH(nc, &net_clients, next) {
 461         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 462             if (nc->queue_index == 0) {
 463                 func(qemu_get_nic(nc), opaque);
 464             }
 465         }
 466     }
 467 }
 468
 469 bool qemu_has_ufo(NetClientState *nc)
 470 {
 471     if (!nc || !nc->info->has_ufo) {
 472         return false;
 473     }
 474
 475     return nc->info->has_ufo(nc);
 476 }
 477
 478 bool qemu_has_vnet_hdr(NetClientState *nc)
 479 {
 480     if (!nc || !nc->info->has_vnet_hdr) {
 481         return false;
 482     }
 483
 484     return nc->info->has_vnet_hdr(nc);
 485 }
 486
 487 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 488 {
 489     if (!nc || !nc->info->has_vnet_hdr_len) {
 490         return false;
 491     }
 492
 493     return nc->info->has_vnet_hdr_len(nc, len);
 494 }
 495
 496 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 497 {
 498     if (!nc || !nc->info->using_vnet_hdr) {
 499         return;
 500     }
 501
 502     nc->info->using_vnet_hdr(nc, enable);
 503 }
 504
 505 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 506                           int ecn, int ufo)
 507 {
 508     if (!nc || !nc->info->set_offload) {
 509         return;
 510     }
 511
 512     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 513 }
 514
 515 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 516 {
 517     if (!nc || !nc->info->set_vnet_hdr_len) {
 518         return;
 519     }
 520
 521     nc->vnet_hdr_len = len;
 522     nc->info->set_vnet_hdr_len(nc, len);
 523 }
 524
 525 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 526 {
 527 #if HOST_BIG_ENDIAN
 528     if (!nc || !nc->info->set_vnet_le) {
 529         return -ENOSYS;
 530     }
 531
 532     return nc->info->set_vnet_le(nc, is_le);
 533 #else
 534     return 0;
 535 #endif
 536 }
 537
 538 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 539 {
 540 #if HOST_BIG_ENDIAN
 541     return 0;
 542 #else
 543     if (!nc || !nc->info->set_vnet_be) {
 544         return -ENOSYS;
 545     }
 546
 547     return nc->info->set_vnet_be(nc, is_be);
 548 #endif
 549 }
 550
 551 int qemu_can_receive_packet(NetClientState *nc)
 552 {
 553     if (nc->receive_disabled) {
 554         return 0;
 555     } else if (nc->info->can_receive &&
 556                !nc->info->can_receive(nc)) {
 557         return 0;
 558     }
 559     return 1;
 560 }
 561
 562 int qemu_can_send_packet(NetClientState *sender)
 563 {
 564     int vm_running = runstate_is_running();
 565
 566     if (!vm_running) {
 567         return 0;
 568     }
 569
 570     if (!sender->peer) {
 571         return 1;
 572     }
 573
 574     return qemu_can_receive_packet(sender->peer);
 575 }
 576
 577 static ssize_t filter_receive_iov(NetClientState *nc,
 578                                   NetFilterDirection direction,
 579                                   NetClientState *sender,
 580                                   unsigned flags,
 581                                   const struct iovec *iov,
 582                                   int iovcnt,
 583                                   NetPacketSent *sent_cb)
 584 {
 585     ssize_t ret = 0;
 586     NetFilterState *nf = NULL;
 587
 588     if (direction == NET_FILTER_DIRECTION_TX) {
 589         QTAILQ_FOREACH(nf, &nc->filters, next) {
 590             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 591                                          iovcnt, sent_cb);
 592             if (ret) {
 593                 return ret;
 594             }
 595         }
 596     } else {
 597         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
 598             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 599                                          iovcnt, sent_cb);
 600             if (ret) {
 601                 return ret;
 602             }
 603         }
 604     }
 605
 606     return ret;
 607 }
 608
 609 static ssize_t filter_receive(NetClientState *nc,
 610                               NetFilterDirection direction,
 611                               NetClientState *sender,
 612                               unsigned flags,
 613                               const uint8_t *data,
 614                               size_t size,
 615                               NetPacketSent *sent_cb)
 616 {
 617     struct iovec iov = {
 618         .iov_base = (void *)data,
 619         .iov_len = size
 620     };
 621
 622     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 623 }
 624
 625 void qemu_purge_queued_packets(NetClientState *nc)
 626 {
 627     if (!nc->peer) {
 628         return;
 629     }
 630
 631     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 632 }
 633
 634 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 635 {
 636     nc->receive_disabled = 0;
 637
 638     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 639         if (net_hub_flush(nc->peer)) {
 640             qemu_notify_event();
 641         }
 642     }
 643     if (qemu_net_queue_flush(nc->incoming_queue)) {
 644         /* We emptied the queue successfully, signal to the IO thread to repoll
 645          * the file descriptor (for tap, for example).
 646          */
 647         qemu_notify_event();
 648     } else if (purge) {
 649         /* Unable to empty the queue, purge remaining packets */
 650         qemu_net_queue_purge(nc->incoming_queue, nc->peer);
 651     }
 652 }
 653
 654 void qemu_flush_queued_packets(NetClientState *nc)
 655 {
 656     qemu_flush_or_purge_queued_packets(nc, false);
 657 }
 658
 659 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 660                                                  unsigned flags,
 661                                                  const uint8_t *buf, int size,
 662                                                  NetPacketSent *sent_cb)
 663 {
 664     NetQueue *queue;
 665     int ret;
 666
 667 #ifdef DEBUG_NET
 668     printf("qemu_send_packet_async:\n");
 669     qemu_hexdump(stdout, "net", buf, size);
 670 #endif
 671
 672     if (sender->link_down || !sender->peer) {
 673         return size;
 674     }
 675
 676     /* Let filters handle the packet first */
 677     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 678                          sender, flags, buf, size, sent_cb);
 679     if (ret) {
 680         return ret;
 681     }
 682
 683     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 684                          sender, flags, buf, size, sent_cb);
 685     if (ret) {
 686         return ret;
 687     }
 688
 689     queue = sender->peer->incoming_queue;
 690
 691     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 692 }
 693
 694 ssize_t qemu_send_packet_async(NetClientState *sender,
 695                                const uint8_t *buf, int size,
 696                                NetPacketSent *sent_cb)
 697 {
 698     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 699                                              buf, size, sent_cb);
 700 }
 701
 702 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 703 {
 704     return qemu_send_packet_async(nc, buf, size, NULL);
 705 }
 706
 707 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size)
 708 {
 709     if (!qemu_can_receive_packet(nc)) {
 710         return 0;
 711     }
 712
 713     return qemu_net_queue_receive(nc->incoming_queue, buf, size);
 714 }
 715
 716 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov,
 717                                 int iovcnt)
 718 {
 719     if (!qemu_can_receive_packet(nc)) {
 720         return 0;
 721     }
 722
 723     return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt);
 724 }
 725
 726 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 727 {
 728     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 729                                              buf, size, NULL);
 730 }
 731
 732 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 733                                int iovcnt, unsigned flags)
 734 {
 735     uint8_t *buf = NULL;
 736     uint8_t *buffer;
 737     size_t offset;
 738     ssize_t ret;
 739
 740     if (iovcnt == 1) {
 741         buffer = iov[0].iov_base;
 742         offset = iov[0].iov_len;
 743     } else {
 744         offset = iov_size(iov, iovcnt);
 745         if (offset > NET_BUFSIZE) {
 746             return -1;
 747         }
 748         buf = g_malloc(offset);
 749         buffer = buf;
 750         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 751     }
 752
 753     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 754         ret = nc->info->receive_raw(nc, buffer, offset);
 755     } else {
 756         ret = nc->info->receive(nc, buffer, offset);
 757     }
 758
 759     g_free(buf);
 760     return ret;
 761 }
 762
 763 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 764                                        unsigned flags,
 765                                        const struct iovec *iov,
 766                                        int iovcnt,
 767                                        void *opaque)
 768 {
 769     NetClientState *nc = opaque;
 770     int ret;
 771
 772
 773     if (nc->link_down) {
 774         return iov_size(iov, iovcnt);
 775     }
 776
 777     if (nc->receive_disabled) {
 778         return 0;
 779     }
 780
 781     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 782         ret = nc->info->receive_iov(nc, iov, iovcnt);
 783     } else {
 784         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 785     }
 786
 787     if (ret == 0) {
 788         nc->receive_disabled = 1;
 789     }
 790
 791     return ret;
 792 }
 793
 794 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 795                                 const struct iovec *iov, int iovcnt,
 796                                 NetPacketSent *sent_cb)
 797 {
 798     NetQueue *queue;
 799     size_t size = iov_size(iov, iovcnt);
 800     int ret;
 801
 802     if (size > NET_BUFSIZE) {
 803         return size;
 804     }
 805
 806     if (sender->link_down || !sender->peer) {
 807         return size;
 808     }
 809
 810     /* Let filters handle the packet first */
 811     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 812                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 813     if (ret) {
 814         return ret;
 815     }
 816
 817     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 818                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 819     if (ret) {
 820         return ret;
 821     }
 822
 823     queue = sender->peer->incoming_queue;
 824
 825     return qemu_net_queue_send_iov(queue, sender,
 826                                    QEMU_NET_PACKET_FLAG_NONE,
 827                                    iov, iovcnt, sent_cb);
 828 }
 829
 830 ssize_t
 831 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 832 {
 833     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 834 }
 835
 836 NetClientState *qemu_find_netdev(const char *id)
 837 {
 838     NetClientState *nc;
 839
 840     QTAILQ_FOREACH(nc, &net_clients, next) {
 841         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 842             continue;
 843         if (!strcmp(nc->name, id)) {
 844             return nc;
 845         }
 846     }
 847
 848     return NULL;
 849 }
 850
 851 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 852                                  NetClientDriver type, int max)
 853 {
 854     NetClientState *nc;
 855     int ret = 0;
 856
 857     QTAILQ_FOREACH(nc, &net_clients, next) {
 858         if (nc->info->type == type) {
 859             continue;
 860         }
 861         if (!id || !strcmp(nc->name, id)) {
 862             if (ret < max) {
 863                 ncs[ret] = nc;
 864             }
 865             ret++;
 866         }
 867     }
 868
 869     return ret;
 870 }
 871
 872 static int nic_get_free_idx(void)
 873 {
 874     int index;
 875
 876     for (index = 0; index < MAX_NICS; index++)
 877         if (!nd_table[index].used)
 878             return index;
 879     return -1;
 880 }
 881
 882 int qemu_show_nic_models(const char *arg, const char *const *models)
 883 {
 884     int i;
 885
 886     if (!arg || !is_help_option(arg)) {
 887         return 0;
 888     }
 889
 890     printf("Supported NIC models:\n");
 891     for (i = 0 ; models[i]; i++) {
 892         printf("%s\n", models[i]);
 893     }
 894     return 1;
 895 }
 896
 897 void qemu_check_nic_model(NICInfo *nd, const char *model)
 898 {
 899     const char *models[2];
 900
 901     models[0] = model;
 902     models[1] = NULL;
 903
 904     if (qemu_show_nic_models(nd->model, models))
 905         exit(0);
 906     if (qemu_find_nic_model(nd, models, model) < 0)
 907         exit(1);
 908 }
 909
 910 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 911                         const char *default_model)
 912 {
 913     int i;
 914
 915     if (!nd->model)
 916         nd->model = g_strdup(default_model);
 917
 918     for (i = 0 ; models[i]; i++) {
 919         if (strcmp(nd->model, models[i]) == 0)
 920             return i;
 921     }
 922
 923     error_report("Unsupported NIC model: %s", nd->model);
 924     return -1;
 925 }
 926
 927 static int net_init_nic(const Netdev *netdev, const char *name,
 928                         NetClientState *peer, Error **errp)
 929 {
 930     int idx;
 931     NICInfo *nd;
 932     const NetLegacyNicOptions *nic;
 933
 934     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 935     nic = &netdev->u.nic;
 936
 937     idx = nic_get_free_idx();
 938     if (idx == -1 || nb_nics >= MAX_NICS) {
 939         error_setg(errp, "too many NICs");
 940         return -1;
 941     }
 942
 943     nd = &nd_table[idx];
 944
 945     memset(nd, 0, sizeof(*nd));
 946
 947     if (nic->has_netdev) {
 948         nd->netdev = qemu_find_netdev(nic->netdev);
 949         if (!nd->netdev) {
 950             error_setg(errp, "netdev '%s' not found", nic->netdev);
 951             return -1;
 952         }
 953     } else {
 954         assert(peer);
 955         nd->netdev = peer;
 956     }
 957     nd->name = g_strdup(name);
 958     if (nic->has_model) {
 959         nd->model = g_strdup(nic->model);
 960     }
 961     if (nic->has_addr) {
 962         nd->devaddr = g_strdup(nic->addr);
 963     }
 964
 965     if (nic->has_macaddr &&
 966         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 967         error_setg(errp, "invalid syntax for ethernet address");
 968         return -1;
 969     }
 970     if (nic->has_macaddr &&
 971         is_multicast_ether_addr(nd->macaddr.a)) {
 972         error_setg(errp,
 973                    "NIC cannot have multicast MAC address (odd 1st byte)");
 974         return -1;
 975     }
 976     qemu_macaddr_default_if_unset(&nd->macaddr);
 977
 978     if (nic->has_vectors) {
 979         if (nic->vectors > 0x7ffffff) {
 980             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 981             return -1;
 982         }
 983         nd->nvectors = nic->vectors;
 984     } else {
 985         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 986     }
 987
 988     nd->used = 1;
 989     nb_nics++;
 990
 991     return idx;
 992 }
 993
 994
 995 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 996     const Netdev *netdev,
 997     const char *name,
 998     NetClientState *peer, Error **errp) = {
 999         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
1000 #ifdef CONFIG_SLIRP
1001         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
1002 #endif
1003         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
1004         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
1005 #ifdef CONFIG_VDE
1006         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
1007 #endif
1008 #ifdef CONFIG_NETMAP
1009         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
1010 #endif
1011 #ifdef CONFIG_NET_BRIDGE
1012         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
1013 #endif
1014         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
1015 #ifdef CONFIG_VHOST_NET_USER
1016         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
1017 #endif
1018 #ifdef CONFIG_VHOST_NET_VDPA
1019         [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
1020 #endif
1021 #ifdef CONFIG_L2TPV3
1022         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
1023 #endif
1024 };
1025
1026
1027 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
1028 {
1029     NetClientState *peer = NULL;
1030     NetClientState *nc;
1031
1032     if (is_netdev) {
1033         if (netdev->type == NET_CLIENT_DRIVER_NIC ||
1034             !net_client_init_fun[netdev->type]) {
1035             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1036                        "a netdev backend type");
1037             return -1;
1038         }
1039     } else {
1040         if (netdev->type == NET_CLIENT_DRIVER_NONE) {
1041             return 0; /* nothing to do */
1042         }
1043         if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
1044             !net_client_init_fun[netdev->type]) {
1045             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1046                        "a net backend type (maybe it is not compiled "
1047                        "into this binary)");
1048             return -1;
1049         }
1050
1051         /* Do not add to a hub if it's a nic with a netdev= parameter. */
1052         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1053             !netdev->u.nic.has_netdev) {
1054             peer = net_hub_add_port(0, NULL, NULL);
1055         }
1056     }
1057
1058     nc = qemu_find_netdev(netdev->id);
1059     if (nc) {
1060         error_setg(errp, "Duplicate ID '%s'", netdev->id);
1061         return -1;
1062     }
1063
1064     if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1065         /* FIXME drop when all init functions store an Error */
1066         if (errp && !*errp) {
1067             error_setg(errp, "Device '%s' could not be initialized",
1068                        NetClientDriver_str(netdev->type));
1069         }
1070         return -1;
1071     }
1072
1073     if (is_netdev) {
1074         nc = qemu_find_netdev(netdev->id);
1075         assert(nc);
1076         nc->is_netdev = true;
1077     }
1078
1079     return 0;
1080 }
1081
1082 void show_netdevs(void)
1083 {
1084     int idx;
1085     const char *available_netdevs[] = {
1086         "socket",
1087         "hubport",
1088         "tap",
1089 #ifdef CONFIG_SLIRP
1090         "user",
1091 #endif
1092 #ifdef CONFIG_L2TPV3
1093         "l2tpv3",
1094 #endif
1095 #ifdef CONFIG_VDE
1096         "vde",
1097 #endif
1098 #ifdef CONFIG_NET_BRIDGE
1099         "bridge",
1100 #endif
1101 #ifdef CONFIG_NETMAP
1102         "netmap",
1103 #endif
1104 #ifdef CONFIG_POSIX
1105         "vhost-user",
1106 #endif
1107 #ifdef CONFIG_VHOST_VDPA
1108         "vhost-vdpa",
1109 #endif
1110     };
1111
1112     qemu_printf("Available netdev backend types:\n");
1113     for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1114         qemu_printf("%s\n", available_netdevs[idx]);
1115     }
1116 }
1117
1118 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1119 {
1120     gchar **substrings = NULL;
1121     Netdev *object = NULL;
1122     int ret = -1;
1123     Visitor *v = opts_visitor_new(opts);
1124
1125     /* Parse convenience option format ip6-net=fec0::0[/64] */
1126     const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1127
1128     if (ip6_net) {
1129         char *prefix_addr;
1130         unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1131
1132         substrings = g_strsplit(ip6_net, "/", 2);
1133         if (!substrings || !substrings[0]) {
1134             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1135                        "a valid IPv6 prefix");
1136             goto out;
1137         }
1138
1139         prefix_addr = substrings[0];
1140
1141         /* Handle user-specified prefix length. */
1142         if (substrings[1] &&
1143             qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1144         {
1145             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1146                        "ipv6-prefixlen", "a number");
1147             goto out;
1148         }
1149
1150         qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1151         qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1152                             &error_abort);
1153         qemu_opt_unset(opts, "ipv6-net");
1154     }
1155
1156     /* Create an ID for -net if the user did not specify one */
1157     if (!is_netdev && !qemu_opts_id(opts)) {
1158         qemu_opts_set_id(opts, id_generate(ID_NET));
1159     }
1160
1161     if (visit_type_Netdev(v, NULL, &object, errp)) {
1162         ret = net_client_init1(object, is_netdev, errp);
1163     }
1164
1165     qapi_free_Netdev(object);
1166
1167 out:
1168     g_strfreev(substrings);
1169     visit_free(v);
1170     return ret;
1171 }
1172
1173 void netdev_add(QemuOpts *opts, Error **errp)
1174 {
1175     net_client_init(opts, true, errp);
1176 }
1177
1178 void qmp_netdev_add(Netdev *netdev, Error **errp)
1179 {
1180     if (!id_wellformed(netdev->id)) {
1181         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
1182         return;
1183     }
1184
1185     net_client_init1(netdev, true, errp);
1186 }
1187
1188 void qmp_netdev_del(const char *id, Error **errp)
1189 {
1190     NetClientState *nc;
1191     QemuOpts *opts;
1192
1193     nc = qemu_find_netdev(id);
1194     if (!nc) {
1195         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1196                   "Device '%s' not found", id);
1197         return;
1198     }
1199
1200     if (!nc->is_netdev) {
1201         error_setg(errp, "Device '%s' is not a netdev", id);
1202         return;
1203     }
1204
1205     qemu_del_net_client(nc);
1206
1207     /*
1208      * Wart: we need to delete the QemuOpts associated with netdevs
1209      * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in
1210      * HMP netdev_add.
1211      */
1212     opts = qemu_opts_find(qemu_find_opts("netdev"), id);
1213     if (opts) {
1214         qemu_opts_del(opts);
1215     }
1216 }
1217
1218 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1219 {
1220     char *str;
1221     ObjectProperty *prop;
1222     ObjectPropertyIterator iter;
1223     Visitor *v;
1224
1225     /* generate info str */
1226     object_property_iter_init(&iter, OBJECT(nf));
1227     while ((prop = object_property_iter_next(&iter))) {
1228         if (!strcmp(prop->name, "type")) {
1229             continue;
1230         }
1231         v = string_output_visitor_new(false, &str);
1232         object_property_get(OBJECT(nf), prop->name, v, NULL);
1233         visit_complete(v, &str);
1234         visit_free(v);
1235         monitor_printf(mon, ",%s=%s", prop->name, str);
1236         g_free(str);
1237     }
1238     monitor_printf(mon, "\n");
1239 }
1240
1241 void print_net_client(Monitor *mon, NetClientState *nc)
1242 {
1243     NetFilterState *nf;
1244
1245     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1246                    nc->queue_index,
1247                    NetClientDriver_str(nc->info->type),
1248                    nc->info_str);
1249     if (!QTAILQ_EMPTY(&nc->filters)) {
1250         monitor_printf(mon, "filters:\n");
1251     }
1252     QTAILQ_FOREACH(nf, &nc->filters, next) {
1253         monitor_printf(mon, "  - %s: type=%s",
1254                        object_get_canonical_path_component(OBJECT(nf)),
1255                        object_get_typename(OBJECT(nf)));
1256         netfilter_print_info(mon, nf);
1257     }
1258 }
1259
1260 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1261                                       Error **errp)
1262 {
1263     NetClientState *nc;
1264     RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
1265
1266     QTAILQ_FOREACH(nc, &net_clients, next) {
1267         RxFilterInfo *info;
1268
1269         if (has_name && strcmp(nc->name, name) != 0) {
1270             continue;
1271         }
1272
1273         /* only query rx-filter information of NIC */
1274         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1275             if (has_name) {
1276                 error_setg(errp, "net client(%s) isn't a NIC", name);
1277                 assert(!filter_list);
1278                 return NULL;
1279             }
1280             continue;
1281         }
1282
1283         /* only query information on queue 0 since the info is per nic,
1284          * not per queue
1285          */
1286         if (nc->queue_index != 0)
1287             continue;
1288
1289         if (nc->info->query_rx_filter) {
1290             info = nc->info->query_rx_filter(nc);
1291             QAPI_LIST_APPEND(tail, info);
1292         } else if (has_name) {
1293             error_setg(errp, "net client(%s) doesn't support"
1294                        " rx-filter querying", name);
1295             assert(!filter_list);
1296             return NULL;
1297         }
1298
1299         if (has_name) {
1300             break;
1301         }
1302     }
1303
1304     if (filter_list == NULL && has_name) {
1305         error_setg(errp, "invalid net client name: %s", name);
1306     }
1307
1308     return filter_list;
1309 }
1310
1311 void hmp_info_network(Monitor *mon, const QDict *qdict)
1312 {
1313     NetClientState *nc, *peer;
1314     NetClientDriver type;
1315
1316     net_hub_info(mon);
1317
1318     QTAILQ_FOREACH(nc, &net_clients, next) {
1319         peer = nc->peer;
1320         type = nc->info->type;
1321
1322         /* Skip if already printed in hub info */
1323         if (net_hub_id_for_client(nc, NULL) == 0) {
1324             continue;
1325         }
1326
1327         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1328             print_net_client(mon, nc);
1329         } /* else it's a netdev connected to a NIC, printed with the NIC */
1330         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1331             monitor_printf(mon, " \\ ");
1332             print_net_client(mon, peer);
1333         }
1334     }
1335 }
1336
1337 void colo_notify_filters_event(int event, Error **errp)
1338 {
1339     NetClientState *nc;
1340     NetFilterState *nf;
1341     NetFilterClass *nfc = NULL;
1342     Error *local_err = NULL;
1343
1344     QTAILQ_FOREACH(nc, &net_clients, next) {
1345         QTAILQ_FOREACH(nf, &nc->filters, next) {
1346             nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1347             nfc->handle_event(nf, event, &local_err);
1348             if (local_err) {
1349                 error_propagate(errp, local_err);
1350                 return;
1351             }
1352         }
1353     }
1354 }
1355
1356 void qmp_set_link(const char *name, bool up, Error **errp)
1357 {
1358     NetClientState *ncs[MAX_QUEUE_NUM];
1359     NetClientState *nc;
1360     int queues, i;
1361
1362     queues = qemu_find_net_clients_except(name, ncs,
1363                                           NET_CLIENT_DRIVER__MAX,
1364                                           MAX_QUEUE_NUM);
1365
1366     if (queues == 0) {
1367         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1368                   "Device '%s' not found", name);
1369         return;
1370     }
1371     nc = ncs[0];
1372
1373     for (i = 0; i < queues; i++) {
1374         ncs[i]->link_down = !up;
1375     }
1376
1377     if (nc->info->link_status_changed) {
1378         nc->info->link_status_changed(nc);
1379     }
1380
1381     if (nc->peer) {
1382         /* Change peer link only if the peer is NIC and then notify peer.
1383          * If the peer is a HUBPORT or a backend, we do not change the
1384          * link status.
1385          *
1386          * This behavior is compatible with qemu hubs where there could be
1387          * multiple clients that can still communicate with each other in
1388          * disconnected mode. For now maintain this compatibility.
1389          */
1390         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1391             for (i = 0; i < queues; i++) {
1392                 ncs[i]->peer->link_down = !up;
1393             }
1394         }
1395         if (nc->peer->info->link_status_changed) {
1396             nc->peer->info->link_status_changed(nc->peer);
1397         }
1398     }
1399 }
1400
1401 static void net_vm_change_state_handler(void *opaque, bool running,
1402                                         RunState state)
1403 {
1404     NetClientState *nc;
1405     NetClientState *tmp;
1406
1407     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1408         if (running) {
1409             /* Flush queued packets and wake up backends. */
1410             if (nc->peer && qemu_can_send_packet(nc)) {
1411                 qemu_flush_queued_packets(nc->peer);
1412             }
1413         } else {
1414             /* Complete all queued packets, to guarantee we don't modify
1415              * state later when VM is not running.
1416              */
1417             qemu_flush_or_purge_queued_packets(nc, true);
1418         }
1419     }
1420 }
1421
1422 void net_cleanup(void)
1423 {
1424     NetClientState *nc;
1425
1426     /*cleanup colo compare module for COLO*/
1427     colo_compare_cleanup();
1428
1429     /* We may del multiple entries during qemu_del_net_client(),
1430      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1431      */
1432     while (!QTAILQ_EMPTY(&net_clients)) {
1433         nc = QTAILQ_FIRST(&net_clients);
1434         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1435             qemu_del_nic(qemu_get_nic(nc));
1436         } else {
1437             qemu_del_net_client(nc);
1438         }
1439     }
1440
1441     qemu_del_vm_change_state_handler(net_change_state_entry);
1442 }
1443
1444 void net_check_clients(void)
1445 {
1446     NetClientState *nc;
1447     int i;
1448
1449     net_hub_check_clients();
1450
1451     QTAILQ_FOREACH(nc, &net_clients, next) {
1452         if (!nc->peer) {
1453             warn_report("%s %s has no peer",
1454                         nc->info->type == NET_CLIENT_DRIVER_NIC
1455                         ? "nic" : "netdev",
1456                         nc->name);
1457         }
1458     }
1459
1460     /* Check that all NICs requested via -net nic actually got created.
1461      * NICs created via -device don't need to be checked here because
1462      * they are always instantiated.
1463      */
1464     for (i = 0; i < MAX_NICS; i++) {
1465         NICInfo *nd = &nd_table[i];
1466         if (nd->used && !nd->instantiated) {
1467             warn_report("requested NIC (%s, model %s) "
1468                         "was not created (not supported by this machine?)",
1469                         nd->name ? nd->name : "anonymous",
1470                         nd->model ? nd->model : "unspecified");
1471         }
1472     }
1473 }
1474
1475 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1476 {
1477     return net_client_init(opts, false, errp);
1478 }
1479
1480 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1481 {
1482     const char *type = qemu_opt_get(opts, "type");
1483
1484     if (type && is_help_option(type)) {
1485         show_netdevs();
1486         exit(0);
1487     }
1488     return net_client_init(opts, true, errp);
1489 }
1490
1491 /* For the convenience "--nic" parameter */
1492 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1493 {
1494     char *mac, *nd_id;
1495     int idx, ret;
1496     NICInfo *ni;
1497     const char *type;
1498
1499     type = qemu_opt_get(opts, "type");
1500     if (type && g_str_equal(type, "none")) {
1501         return 0;    /* Nothing to do, default_net is cleared in vl.c */
1502     }
1503
1504     idx = nic_get_free_idx();
1505     if (idx == -1 || nb_nics >= MAX_NICS) {
1506         error_setg(errp, "no more on-board/default NIC slots available");
1507         return -1;
1508     }
1509
1510     if (!type) {
1511         qemu_opt_set(opts, "type", "user", &error_abort);
1512     }
1513
1514     ni = &nd_table[idx];
1515     memset(ni, 0, sizeof(*ni));
1516     ni->model = qemu_opt_get_del(opts, "model");
1517
1518     /* Create an ID if the user did not specify one */
1519     nd_id = g_strdup(qemu_opts_id(opts));
1520     if (!nd_id) {
1521         nd_id = id_generate(ID_NET);
1522         qemu_opts_set_id(opts, nd_id);
1523     }
1524
1525     /* Handle MAC address */
1526     mac = qemu_opt_get_del(opts, "mac");
1527     if (mac) {
1528         ret = net_parse_macaddr(ni->macaddr.a, mac);
1529         g_free(mac);
1530         if (ret) {
1531             error_setg(errp, "invalid syntax for ethernet address");
1532             goto out;
1533         }
1534         if (is_multicast_ether_addr(ni->macaddr.a)) {
1535             error_setg(errp, "NIC cannot have multicast MAC address");
1536             ret = -1;
1537             goto out;
1538         }
1539     }
1540     qemu_macaddr_default_if_unset(&ni->macaddr);
1541
1542     ret = net_client_init(opts, true, errp);
1543     if (ret == 0) {
1544         ni->netdev = qemu_find_netdev(nd_id);
1545         ni->used = true;
1546         nb_nics++;
1547     }
1548
1549 out:
1550     g_free(nd_id);
1551     return ret;
1552 }
1553
1554 int net_init_clients(Error **errp)
1555 {
1556     net_change_state_entry =
1557         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1558
1559     QTAILQ_INIT(&net_clients);
1560
1561     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1562                           net_init_netdev, NULL, errp)) {
1563         return -1;
1564     }
1565
1566     if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1567         return -1;
1568     }
1569
1570     if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1571         return -1;
1572     }
1573
1574     return 0;
1575 }
1576
1577 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1578 {
1579     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1580         return -1;
1581     }
1582
1583     return 0;
1584 }
1585
1586 /* From FreeBSD */
1587 /* XXX: optimize */
1588 uint32_t net_crc32(const uint8_t *p, int len)
1589 {
1590     uint32_t crc;
1591     int carry, i, j;
1592     uint8_t b;
1593
1594     crc = 0xffffffff;
1595     for (i = 0; i < len; i++) {
1596         b = *p++;
1597         for (j = 0; j < 8; j++) {
1598             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1599             crc <<= 1;
1600             b >>= 1;
1601             if (carry) {
1602                 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1603             }
1604         }
1605     }
1606
1607     return crc;
1608 }
1609
1610 uint32_t net_crc32_le(const uint8_t *p, int len)
1611 {
1612     uint32_t crc;
1613     int carry, i, j;
1614     uint8_t b;
1615
1616     crc = 0xffffffff;
1617     for (i = 0; i < len; i++) {
1618         b = *p++;
1619         for (j = 0; j < 8; j++) {
1620             carry = (crc & 0x1) ^ (b & 0x01);
1621             crc >>= 1;
1622             b >>= 1;
1623             if (carry) {
1624                 crc ^= POLYNOMIAL_LE;
1625             }
1626         }
1627     }
1628
1629     return crc;
1630 }
1631
1632 QemuOptsList qemu_netdev_opts = {
1633     .name = "netdev",
1634     .implied_opt_name = "type",
1635     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1636     .desc = {
1637         /*
1638          * no elements => accept any params
1639          * validation will happen later
1640          */
1641         { /* end of list */ }
1642     },
1643 };
1644
1645 QemuOptsList qemu_nic_opts = {
1646     .name = "nic",
1647     .implied_opt_name = "type",
1648     .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1649     .desc = {
1650         /*
1651          * no elements => accept any params
1652          * validation will happen later
1653          */
1654         { /* end of list */ }
1655     },
1656 };
1657
1658 QemuOptsList qemu_net_opts = {
1659     .name = "net",
1660     .implied_opt_name = "type",
1661     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1662     .desc = {
1663         /*
1664          * no elements => accept any params
1665          * validation will happen later
1666          */
1667         { /* end of list */ }
1668     },
1669 };
1670
1671 void net_socket_rs_init(SocketReadState *rs,
1672                         SocketReadStateFinalize *finalize,
1673                         bool vnet_hdr)
1674 {
1675     rs->state = 0;
1676     rs->vnet_hdr = vnet_hdr;
1677     rs->index = 0;
1678     rs->packet_len = 0;
1679     rs->vnet_hdr_len = 0;
1680     memset(rs->buf, 0, sizeof(rs->buf));
1681     rs->finalize = finalize;
1682 }
1683
1684 /*
1685  * Returns
1686  * 0: success
1687  * -1: error occurs
1688  */
1689 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1690 {
1691     unsigned int l;
1692
1693     while (size > 0) {
1694         /* Reassemble a packet from the network.
1695          * 0 = getting length.
1696          * 1 = getting vnet header length.
1697          * 2 = getting data.
1698          */
1699         switch (rs->state) {
1700         case 0:
1701             l = 4 - rs->index;
1702             if (l > size) {
1703                 l = size;
1704             }
1705             memcpy(rs->buf + rs->index, buf, l);
1706             buf += l;
1707             size -= l;
1708             rs->index += l;
1709             if (rs->index == 4) {
1710                 /* got length */
1711                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1712                 rs->index = 0;
1713                 if (rs->vnet_hdr) {
1714                     rs->state = 1;
1715                 } else {
1716                     rs->state = 2;
1717                     rs->vnet_hdr_len = 0;
1718                 }
1719             }
1720             break;
1721         case 1:
1722             l = 4 - rs->index;
1723             if (l > size) {
1724                 l = size;
1725             }
1726             memcpy(rs->buf + rs->index, buf, l);
1727             buf += l;
1728             size -= l;
1729             rs->index += l;
1730             if (rs->index == 4) {
1731                 /* got vnet header length */
1732                 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1733                 rs->index = 0;
1734                 rs->state = 2;
1735             }
1736             break;
1737         case 2:
1738             l = rs->packet_len - rs->index;
1739             if (l > size) {
1740                 l = size;
1741             }
1742             if (rs->index + l <= sizeof(rs->buf)) {
1743                 memcpy(rs->buf + rs->index, buf, l);
1744             } else {
1745                 fprintf(stderr, "serious error: oversized packet received,"
1746                     "connection terminated.\n");
1747                 rs->index = rs->state = 0;
1748                 return -1;
1749             }
1750
1751             rs->index += l;
1752             buf += l;
1753             size -= l;
1754             if (rs->index >= rs->packet_len) {
1755                 rs->index = 0;
1756                 rs->state = 0;
1757                 assert(rs->finalize);
1758                 rs->finalize(rs);
1759             }
1760             break;
1761         }
1762     }
1763
1764     assert(size == 0);
1765     return 0;
1766 }