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 #include "qemu/osdep.h"
  25
  26 #include "net/net.h"
  27 #include "clients.h"
  28 #include "hub.h"
  29 #include "net/slirp.h"
  30 #include "net/eth.h"
  31 #include "util.h"
  32
  33 #include "monitor/monitor.h"
  34 #include "qemu-common.h"
  35 #include "qemu/help_option.h"
  36 #include "qapi/qmp/qerror.h"
  37 #include "qemu/error-report.h"
  38 #include "qemu/sockets.h"
  39 #include "qemu/cutils.h"
  40 #include "qemu/config-file.h"
  41 #include "qmp-commands.h"
  42 #include "hw/qdev.h"
  43 #include "qemu/iov.h"
  44 #include "qemu/main-loop.h"
  45 #include "qapi-visit.h"
  46 #include "qapi/opts-visitor.h"
  47 #include "sysemu/sysemu.h"
  48 #include "sysemu/qtest.h"
  49 #include "net/filter.h"
  50 #include "qapi/string-output-visitor.h"
  51
  52 /* Net bridge is currently not supported for W32. */
  53 #if !defined(_WIN32)
  54 # define CONFIG_NET_BRIDGE
  55 #endif
  56
  57 static VMChangeStateEntry *net_change_state_entry;
  58 static QTAILQ_HEAD(, NetClientState) net_clients;
  59
  60 const char *host_net_devices[] = {
  61     "tap",
  62     "socket",
  63     "dump",
  64 #ifdef CONFIG_NET_BRIDGE
  65     "bridge",
  66 #endif
  67 #ifdef CONFIG_NETMAP
  68     "netmap",
  69 #endif
  70 #ifdef CONFIG_SLIRP
  71     "user",
  72 #endif
  73 #ifdef CONFIG_VDE
  74     "vde",
  75 #endif
  76     "vhost-user",
  77     NULL,
  78 };
  79
  80 /***********************************************************/
  81 /* network device redirectors */
  82
  83 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  84 {
  85     const char *p, *p1;
  86     int len;
  87     p = *pp;
  88     p1 = strchr(p, sep);
  89     if (!p1)
  90         return -1;
  91     len = p1 - p;
  92     p1++;
  93     if (buf_size > 0) {
  94         if (len > buf_size - 1)
  95             len = buf_size - 1;
  96         memcpy(buf, p, len);
  97         buf[len] = '\0';
  98     }
  99     *pp = p1;
 100     return 0;
 101 }
 102
 103 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 104 {
 105     char buf[512];
 106     struct hostent *he;
 107     const char *p, *r;
 108     int port;
 109
 110     p = str;
 111     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 112         return -1;
 113     saddr->sin_family = AF_INET;
 114     if (buf[0] == '\0') {
 115         saddr->sin_addr.s_addr = 0;
 116     } else {
 117         if (qemu_isdigit(buf[0])) {
 118             if (!inet_aton(buf, &saddr->sin_addr))
 119                 return -1;
 120         } else {
 121             if ((he = gethostbyname(buf)) == NULL)
 122                 return - 1;
 123             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 124         }
 125     }
 126     port = strtol(p, (char **)&r, 0);
 127     if (r == p)
 128         return -1;
 129     saddr->sin_port = htons(port);
 130     return 0;
 131 }
 132
 133 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 134 {
 135     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 136                            macaddr[0], macaddr[1], macaddr[2],
 137                            macaddr[3], macaddr[4], macaddr[5]);
 138 }
 139
 140 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 141 {
 142     snprintf(nc->info_str, sizeof(nc->info_str),
 143              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 144              nc->model,
 145              macaddr[0], macaddr[1], macaddr[2],
 146              macaddr[3], macaddr[4], macaddr[5]);
 147 }
 148
 149 static int mac_table[256] = {0};
 150
 151 static void qemu_macaddr_set_used(MACAddr *macaddr)
 152 {
 153     int index;
 154
 155     for (index = 0x56; index < 0xFF; index++) {
 156         if (macaddr->a[5] == index) {
 157             mac_table[index]++;
 158         }
 159     }
 160 }
 161
 162 static void qemu_macaddr_set_free(MACAddr *macaddr)
 163 {
 164     int index;
 165     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 166
 167     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 168         return;
 169     }
 170     for (index = 0x56; index < 0xFF; index++) {
 171         if (macaddr->a[5] == index) {
 172             mac_table[index]--;
 173         }
 174     }
 175 }
 176
 177 static int qemu_macaddr_get_free(void)
 178 {
 179     int index;
 180
 181     for (index = 0x56; index < 0xFF; index++) {
 182         if (mac_table[index] == 0) {
 183             return index;
 184         }
 185     }
 186
 187     return -1;
 188 }
 189
 190 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 191 {
 192     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 193     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 194
 195     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 196         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 197             return;
 198         } else {
 199             qemu_macaddr_set_used(macaddr);
 200             return;
 201         }
 202     }
 203
 204     macaddr->a[0] = 0x52;
 205     macaddr->a[1] = 0x54;
 206     macaddr->a[2] = 0x00;
 207     macaddr->a[3] = 0x12;
 208     macaddr->a[4] = 0x34;
 209     macaddr->a[5] = qemu_macaddr_get_free();
 210     qemu_macaddr_set_used(macaddr);
 211 }
 212
 213 /**
 214  * Generate a name for net client
 215  *
 216  * Only net clients created with the legacy -net option and NICs need this.
 217  */
 218 static char *assign_name(NetClientState *nc1, const char *model)
 219 {
 220     NetClientState *nc;
 221     int id = 0;
 222
 223     QTAILQ_FOREACH(nc, &net_clients, next) {
 224         if (nc == nc1) {
 225             continue;
 226         }
 227         if (strcmp(nc->model, model) == 0) {
 228             id++;
 229         }
 230     }
 231
 232     return g_strdup_printf("%s.%d", model, id);
 233 }
 234
 235 static void qemu_net_client_destructor(NetClientState *nc)
 236 {
 237     g_free(nc);
 238 }
 239
 240 static void qemu_net_client_setup(NetClientState *nc,
 241                                   NetClientInfo *info,
 242                                   NetClientState *peer,
 243                                   const char *model,
 244                                   const char *name,
 245                                   NetClientDestructor *destructor)
 246 {
 247     nc->info = info;
 248     nc->model = g_strdup(model);
 249     if (name) {
 250         nc->name = g_strdup(name);
 251     } else {
 252         nc->name = assign_name(nc, model);
 253     }
 254
 255     if (peer) {
 256         assert(!peer->peer);
 257         nc->peer = peer;
 258         peer->peer = nc;
 259     }
 260     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 261
 262     nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
 263     nc->destructor = destructor;
 264     QTAILQ_INIT(&nc->filters);
 265 }
 266
 267 NetClientState *qemu_new_net_client(NetClientInfo *info,
 268                                     NetClientState *peer,
 269                                     const char *model,
 270                                     const char *name)
 271 {
 272     NetClientState *nc;
 273
 274     assert(info->size >= sizeof(NetClientState));
 275
 276     nc = g_malloc0(info->size);
 277     qemu_net_client_setup(nc, info, peer, model, name,
 278                           qemu_net_client_destructor);
 279
 280     return nc;
 281 }
 282
 283 NICState *qemu_new_nic(NetClientInfo *info,
 284                        NICConf *conf,
 285                        const char *model,
 286                        const char *name,
 287                        void *opaque)
 288 {
 289     NetClientState **peers = conf->peers.ncs;
 290     NICState *nic;
 291     int i, queues = MAX(1, conf->peers.queues);
 292
 293     assert(info->type == NET_CLIENT_DRIVER_NIC);
 294     assert(info->size >= sizeof(NICState));
 295
 296     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 297     nic->ncs = (void *)nic + info->size;
 298     nic->conf = conf;
 299     nic->opaque = opaque;
 300
 301     for (i = 0; i < queues; i++) {
 302         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 303                               NULL);
 304         nic->ncs[i].queue_index = i;
 305     }
 306
 307     return nic;
 308 }
 309
 310 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 311 {
 312     return nic->ncs + queue_index;
 313 }
 314
 315 NetClientState *qemu_get_queue(NICState *nic)
 316 {
 317     return qemu_get_subqueue(nic, 0);
 318 }
 319
 320 NICState *qemu_get_nic(NetClientState *nc)
 321 {
 322     NetClientState *nc0 = nc - nc->queue_index;
 323
 324     return (NICState *)((void *)nc0 - nc->info->size);
 325 }
 326
 327 void *qemu_get_nic_opaque(NetClientState *nc)
 328 {
 329     NICState *nic = qemu_get_nic(nc);
 330
 331     return nic->opaque;
 332 }
 333
 334 static void qemu_cleanup_net_client(NetClientState *nc)
 335 {
 336     QTAILQ_REMOVE(&net_clients, nc, next);
 337
 338     if (nc->info->cleanup) {
 339         nc->info->cleanup(nc);
 340     }
 341 }
 342
 343 static void qemu_free_net_client(NetClientState *nc)
 344 {
 345     if (nc->incoming_queue) {
 346         qemu_del_net_queue(nc->incoming_queue);
 347     }
 348     if (nc->peer) {
 349         nc->peer->peer = NULL;
 350     }
 351     g_free(nc->name);
 352     g_free(nc->model);
 353     if (nc->destructor) {
 354         nc->destructor(nc);
 355     }
 356 }
 357
 358 void qemu_del_net_client(NetClientState *nc)
 359 {
 360     NetClientState *ncs[MAX_QUEUE_NUM];
 361     int queues, i;
 362     NetFilterState *nf, *next;
 363
 364     assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
 365
 366     /* If the NetClientState belongs to a multiqueue backend, we will change all
 367      * other NetClientStates also.
 368      */
 369     queues = qemu_find_net_clients_except(nc->name, ncs,
 370                                           NET_CLIENT_DRIVER_NIC,
 371                                           MAX_QUEUE_NUM);
 372     assert(queues != 0);
 373
 374     QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
 375         object_unparent(OBJECT(nf));
 376     }
 377
 378     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 379     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
 380         NICState *nic = qemu_get_nic(nc->peer);
 381         if (nic->peer_deleted) {
 382             return;
 383         }
 384         nic->peer_deleted = true;
 385
 386         for (i = 0; i < queues; i++) {
 387             ncs[i]->peer->link_down = true;
 388         }
 389
 390         if (nc->peer->info->link_status_changed) {
 391             nc->peer->info->link_status_changed(nc->peer);
 392         }
 393
 394         for (i = 0; i < queues; i++) {
 395             qemu_cleanup_net_client(ncs[i]);
 396         }
 397
 398         return;
 399     }
 400
 401     for (i = 0; i < queues; i++) {
 402         qemu_cleanup_net_client(ncs[i]);
 403         qemu_free_net_client(ncs[i]);
 404     }
 405 }
 406
 407 void qemu_del_nic(NICState *nic)
 408 {
 409     int i, queues = MAX(nic->conf->peers.queues, 1);
 410
 411     qemu_macaddr_set_free(&nic->conf->macaddr);
 412
 413     /* If this is a peer NIC and peer has already been deleted, free it now. */
 414     if (nic->peer_deleted) {
 415         for (i = 0; i < queues; i++) {
 416             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 417         }
 418     }
 419
 420     for (i = queues - 1; i >= 0; i--) {
 421         NetClientState *nc = qemu_get_subqueue(nic, i);
 422
 423         qemu_cleanup_net_client(nc);
 424         qemu_free_net_client(nc);
 425     }
 426
 427     g_free(nic);
 428 }
 429
 430 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 431 {
 432     NetClientState *nc;
 433
 434     QTAILQ_FOREACH(nc, &net_clients, next) {
 435         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
 436             if (nc->queue_index == 0) {
 437                 func(qemu_get_nic(nc), opaque);
 438             }
 439         }
 440     }
 441 }
 442
 443 bool qemu_has_ufo(NetClientState *nc)
 444 {
 445     if (!nc || !nc->info->has_ufo) {
 446         return false;
 447     }
 448
 449     return nc->info->has_ufo(nc);
 450 }
 451
 452 bool qemu_has_vnet_hdr(NetClientState *nc)
 453 {
 454     if (!nc || !nc->info->has_vnet_hdr) {
 455         return false;
 456     }
 457
 458     return nc->info->has_vnet_hdr(nc);
 459 }
 460
 461 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 462 {
 463     if (!nc || !nc->info->has_vnet_hdr_len) {
 464         return false;
 465     }
 466
 467     return nc->info->has_vnet_hdr_len(nc, len);
 468 }
 469
 470 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 471 {
 472     if (!nc || !nc->info->using_vnet_hdr) {
 473         return;
 474     }
 475
 476     nc->info->using_vnet_hdr(nc, enable);
 477 }
 478
 479 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 480                           int ecn, int ufo)
 481 {
 482     if (!nc || !nc->info->set_offload) {
 483         return;
 484     }
 485
 486     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 487 }
 488
 489 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 490 {
 491     if (!nc || !nc->info->set_vnet_hdr_len) {
 492         return;
 493     }
 494
 495     nc->info->set_vnet_hdr_len(nc, len);
 496 }
 497
 498 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 499 {
 500 #ifdef HOST_WORDS_BIGENDIAN
 501     if (!nc || !nc->info->set_vnet_le) {
 502         return -ENOSYS;
 503     }
 504
 505     return nc->info->set_vnet_le(nc, is_le);
 506 #else
 507     return 0;
 508 #endif
 509 }
 510
 511 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 512 {
 513 #ifdef HOST_WORDS_BIGENDIAN
 514     return 0;
 515 #else
 516     if (!nc || !nc->info->set_vnet_be) {
 517         return -ENOSYS;
 518     }
 519
 520     return nc->info->set_vnet_be(nc, is_be);
 521 #endif
 522 }
 523
 524 int qemu_can_send_packet(NetClientState *sender)
 525 {
 526     int vm_running = runstate_is_running();
 527
 528     if (!vm_running) {
 529         return 0;
 530     }
 531
 532     if (!sender->peer) {
 533         return 1;
 534     }
 535
 536     if (sender->peer->receive_disabled) {
 537         return 0;
 538     } else if (sender->peer->info->can_receive &&
 539                !sender->peer->info->can_receive(sender->peer)) {
 540         return 0;
 541     }
 542     return 1;
 543 }
 544
 545 static ssize_t filter_receive_iov(NetClientState *nc,
 546                                   NetFilterDirection direction,
 547                                   NetClientState *sender,
 548                                   unsigned flags,
 549                                   const struct iovec *iov,
 550                                   int iovcnt,
 551                                   NetPacketSent *sent_cb)
 552 {
 553     ssize_t ret = 0;
 554     NetFilterState *nf = NULL;
 555
 556     if (direction == NET_FILTER_DIRECTION_TX) {
 557         QTAILQ_FOREACH(nf, &nc->filters, next) {
 558             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 559                                          iovcnt, sent_cb);
 560             if (ret) {
 561                 return ret;
 562             }
 563         }
 564     } else {
 565         QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
 566             ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
 567                                          iovcnt, sent_cb);
 568             if (ret) {
 569                 return ret;
 570             }
 571         }
 572     }
 573
 574     return ret;
 575 }
 576
 577 static ssize_t filter_receive(NetClientState *nc,
 578                               NetFilterDirection direction,
 579                               NetClientState *sender,
 580                               unsigned flags,
 581                               const uint8_t *data,
 582                               size_t size,
 583                               NetPacketSent *sent_cb)
 584 {
 585     struct iovec iov = {
 586         .iov_base = (void *)data,
 587         .iov_len = size
 588     };
 589
 590     return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
 591 }
 592
 593 void qemu_purge_queued_packets(NetClientState *nc)
 594 {
 595     if (!nc->peer) {
 596         return;
 597     }
 598
 599     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 600 }
 601
 602 static
 603 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 604 {
 605     nc->receive_disabled = 0;
 606
 607     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
 608         if (net_hub_flush(nc->peer)) {
 609             qemu_notify_event();
 610         }
 611     }
 612     if (qemu_net_queue_flush(nc->incoming_queue)) {
 613         /* We emptied the queue successfully, signal to the IO thread to repoll
 614          * the file descriptor (for tap, for example).
 615          */
 616         qemu_notify_event();
 617     } else if (purge) {
 618         /* Unable to empty the queue, purge remaining packets */
 619         qemu_net_queue_purge(nc->incoming_queue, nc);
 620     }
 621 }
 622
 623 void qemu_flush_queued_packets(NetClientState *nc)
 624 {
 625     qemu_flush_or_purge_queued_packets(nc, false);
 626 }
 627
 628 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 629                                                  unsigned flags,
 630                                                  const uint8_t *buf, int size,
 631                                                  NetPacketSent *sent_cb)
 632 {
 633     NetQueue *queue;
 634     int ret;
 635
 636 #ifdef DEBUG_NET
 637     printf("qemu_send_packet_async:\n");
 638     qemu_hexdump((const char *)buf, stdout, "net", size);
 639 #endif
 640
 641     if (sender->link_down || !sender->peer) {
 642         return size;
 643     }
 644
 645     /* Let filters handle the packet first */
 646     ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
 647                          sender, flags, buf, size, sent_cb);
 648     if (ret) {
 649         return ret;
 650     }
 651
 652     ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
 653                          sender, flags, buf, size, sent_cb);
 654     if (ret) {
 655         return ret;
 656     }
 657
 658     queue = sender->peer->incoming_queue;
 659
 660     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 661 }
 662
 663 ssize_t qemu_send_packet_async(NetClientState *sender,
 664                                const uint8_t *buf, int size,
 665                                NetPacketSent *sent_cb)
 666 {
 667     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 668                                              buf, size, sent_cb);
 669 }
 670
 671 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 672 {
 673     qemu_send_packet_async(nc, buf, size, NULL);
 674 }
 675
 676 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 677 {
 678     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 679                                              buf, size, NULL);
 680 }
 681
 682 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 683                                int iovcnt, unsigned flags)
 684 {
 685     uint8_t *buf = NULL;
 686     uint8_t *buffer;
 687     size_t offset;
 688     ssize_t ret;
 689
 690     if (iovcnt == 1) {
 691         buffer = iov[0].iov_base;
 692         offset = iov[0].iov_len;
 693     } else {
 694         offset = iov_size(iov, iovcnt);
 695         if (offset > NET_BUFSIZE) {
 696             return -1;
 697         }
 698         buf = g_malloc(offset);
 699         buffer = buf;
 700         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
 701     }
 702
 703     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 704         ret = nc->info->receive_raw(nc, buffer, offset);
 705     } else {
 706         ret = nc->info->receive(nc, buffer, offset);
 707     }
 708
 709     g_free(buf);
 710     return ret;
 711 }
 712
 713 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 714                                 unsigned flags,
 715                                 const struct iovec *iov,
 716                                 int iovcnt,
 717                                 void *opaque)
 718 {
 719     NetClientState *nc = opaque;
 720     int ret;
 721
 722     if (nc->link_down) {
 723         return iov_size(iov, iovcnt);
 724     }
 725
 726     if (nc->receive_disabled) {
 727         return 0;
 728     }
 729
 730     if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
 731         ret = nc->info->receive_iov(nc, iov, iovcnt);
 732     } else {
 733         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
 734     }
 735
 736     if (ret == 0) {
 737         nc->receive_disabled = 1;
 738     }
 739
 740     return ret;
 741 }
 742
 743 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 744                                 const struct iovec *iov, int iovcnt,
 745                                 NetPacketSent *sent_cb)
 746 {
 747     NetQueue *queue;
 748     int ret;
 749
 750     if (sender->link_down || !sender->peer) {
 751         return iov_size(iov, iovcnt);
 752     }
 753
 754     /* Let filters handle the packet first */
 755     ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
 756                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 757     if (ret) {
 758         return ret;
 759     }
 760
 761     ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
 762                              QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
 763     if (ret) {
 764         return ret;
 765     }
 766
 767     queue = sender->peer->incoming_queue;
 768
 769     return qemu_net_queue_send_iov(queue, sender,
 770                                    QEMU_NET_PACKET_FLAG_NONE,
 771                                    iov, iovcnt, sent_cb);
 772 }
 773
 774 ssize_t
 775 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 776 {
 777     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 778 }
 779
 780 NetClientState *qemu_find_netdev(const char *id)
 781 {
 782     NetClientState *nc;
 783
 784     QTAILQ_FOREACH(nc, &net_clients, next) {
 785         if (nc->info->type == NET_CLIENT_DRIVER_NIC)
 786             continue;
 787         if (!strcmp(nc->name, id)) {
 788             return nc;
 789         }
 790     }
 791
 792     return NULL;
 793 }
 794
 795 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 796                                  NetClientDriver type, int max)
 797 {
 798     NetClientState *nc;
 799     int ret = 0;
 800
 801     QTAILQ_FOREACH(nc, &net_clients, next) {
 802         if (nc->info->type == type) {
 803             continue;
 804         }
 805         if (!id || !strcmp(nc->name, id)) {
 806             if (ret < max) {
 807                 ncs[ret] = nc;
 808             }
 809             ret++;
 810         }
 811     }
 812
 813     return ret;
 814 }
 815
 816 static int nic_get_free_idx(void)
 817 {
 818     int index;
 819
 820     for (index = 0; index < MAX_NICS; index++)
 821         if (!nd_table[index].used)
 822             return index;
 823     return -1;
 824 }
 825
 826 int qemu_show_nic_models(const char *arg, const char *const *models)
 827 {
 828     int i;
 829
 830     if (!arg || !is_help_option(arg)) {
 831         return 0;
 832     }
 833
 834     fprintf(stderr, "qemu: Supported NIC models: ");
 835     for (i = 0 ; models[i]; i++)
 836         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 837     return 1;
 838 }
 839
 840 void qemu_check_nic_model(NICInfo *nd, const char *model)
 841 {
 842     const char *models[2];
 843
 844     models[0] = model;
 845     models[1] = NULL;
 846
 847     if (qemu_show_nic_models(nd->model, models))
 848         exit(0);
 849     if (qemu_find_nic_model(nd, models, model) < 0)
 850         exit(1);
 851 }
 852
 853 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 854                         const char *default_model)
 855 {
 856     int i;
 857
 858     if (!nd->model)
 859         nd->model = g_strdup(default_model);
 860
 861     for (i = 0 ; models[i]; i++) {
 862         if (strcmp(nd->model, models[i]) == 0)
 863             return i;
 864     }
 865
 866     error_report("Unsupported NIC model: %s", nd->model);
 867     return -1;
 868 }
 869
 870 static int net_init_nic(const Netdev *netdev, const char *name,
 871                         NetClientState *peer, Error **errp)
 872 {
 873     int idx;
 874     NICInfo *nd;
 875     const NetLegacyNicOptions *nic;
 876
 877     assert(netdev->type == NET_CLIENT_DRIVER_NIC);
 878     nic = &netdev->u.nic;
 879
 880     idx = nic_get_free_idx();
 881     if (idx == -1 || nb_nics >= MAX_NICS) {
 882         error_setg(errp, "too many NICs");
 883         return -1;
 884     }
 885
 886     nd = &nd_table[idx];
 887
 888     memset(nd, 0, sizeof(*nd));
 889
 890     if (nic->has_netdev) {
 891         nd->netdev = qemu_find_netdev(nic->netdev);
 892         if (!nd->netdev) {
 893             error_setg(errp, "netdev '%s' not found", nic->netdev);
 894             return -1;
 895         }
 896     } else {
 897         assert(peer);
 898         nd->netdev = peer;
 899     }
 900     nd->name = g_strdup(name);
 901     if (nic->has_model) {
 902         nd->model = g_strdup(nic->model);
 903     }
 904     if (nic->has_addr) {
 905         nd->devaddr = g_strdup(nic->addr);
 906     }
 907
 908     if (nic->has_macaddr &&
 909         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 910         error_setg(errp, "invalid syntax for ethernet address");
 911         return -1;
 912     }
 913     if (nic->has_macaddr &&
 914         is_multicast_ether_addr(nd->macaddr.a)) {
 915         error_setg(errp,
 916                    "NIC cannot have multicast MAC address (odd 1st byte)");
 917         return -1;
 918     }
 919     qemu_macaddr_default_if_unset(&nd->macaddr);
 920
 921     if (nic->has_vectors) {
 922         if (nic->vectors > 0x7ffffff) {
 923             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 924             return -1;
 925         }
 926         nd->nvectors = nic->vectors;
 927     } else {
 928         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 929     }
 930
 931     nd->used = 1;
 932     nb_nics++;
 933
 934     return idx;
 935 }
 936
 937
 938 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 939     const Netdev *netdev,
 940     const char *name,
 941     NetClientState *peer, Error **errp) = {
 942         [NET_CLIENT_DRIVER_NIC]       = net_init_nic,
 943 #ifdef CONFIG_SLIRP
 944         [NET_CLIENT_DRIVER_USER]      = net_init_slirp,
 945 #endif
 946         [NET_CLIENT_DRIVER_TAP]       = net_init_tap,
 947         [NET_CLIENT_DRIVER_SOCKET]    = net_init_socket,
 948 #ifdef CONFIG_VDE
 949         [NET_CLIENT_DRIVER_VDE]       = net_init_vde,
 950 #endif
 951 #ifdef CONFIG_NETMAP
 952         [NET_CLIENT_DRIVER_NETMAP]    = net_init_netmap,
 953 #endif
 954         [NET_CLIENT_DRIVER_DUMP]      = net_init_dump,
 955 #ifdef CONFIG_NET_BRIDGE
 956         [NET_CLIENT_DRIVER_BRIDGE]    = net_init_bridge,
 957 #endif
 958         [NET_CLIENT_DRIVER_HUBPORT]   = net_init_hubport,
 959 #ifdef CONFIG_VHOST_NET_USED
 960         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 961 #endif
 962 #ifdef CONFIG_L2TPV3
 963         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 964 #endif
 965 };
 966
 967
 968 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
 969 {
 970     Netdev legacy = {0};
 971     const Netdev *netdev;
 972     const char *name;
 973     NetClientState *peer = NULL;
 974     static bool vlan_warned;
 975
 976     if (is_netdev) {
 977         netdev = object;
 978         name = netdev->id;
 979
 980         if (netdev->type == NET_CLIENT_DRIVER_DUMP ||
 981             netdev->type == NET_CLIENT_DRIVER_NIC ||
 982             !net_client_init_fun[netdev->type]) {
 983             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 984                        "a netdev backend type");
 985             return -1;
 986         }
 987     } else {
 988         const NetLegacy *net = object;
 989         const NetLegacyOptions *opts = net->opts;
 990         legacy.id = net->id;
 991         netdev = &legacy;
 992         /* missing optional values have been initialized to "all bits zero" */
 993         name = net->has_id ? net->id : net->name;
 994
 995         /* Map the old options to the new flat type */
 996         switch (opts->type) {
 997         case NET_LEGACY_OPTIONS_TYPE_NONE:
 998             return 0; /* nothing to do */
 999         case NET_LEGACY_OPTIONS_TYPE_NIC:
1000             legacy.type = NET_CLIENT_DRIVER_NIC;
1001             legacy.u.nic = opts->u.nic;
1002             break;
1003         case NET_LEGACY_OPTIONS_TYPE_USER:
1004             legacy.type = NET_CLIENT_DRIVER_USER;
1005             legacy.u.user = opts->u.user;
1006             break;
1007         case NET_LEGACY_OPTIONS_TYPE_TAP:
1008             legacy.type = NET_CLIENT_DRIVER_TAP;
1009             legacy.u.tap = opts->u.tap;
1010             break;
1011         case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1012             legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1013             legacy.u.l2tpv3 = opts->u.l2tpv3;
1014             break;
1015         case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1016             legacy.type = NET_CLIENT_DRIVER_SOCKET;
1017             legacy.u.socket = opts->u.socket;
1018             break;
1019         case NET_LEGACY_OPTIONS_TYPE_VDE:
1020             legacy.type = NET_CLIENT_DRIVER_VDE;
1021             legacy.u.vde = opts->u.vde;
1022             break;
1023         case NET_LEGACY_OPTIONS_TYPE_DUMP:
1024             legacy.type = NET_CLIENT_DRIVER_DUMP;
1025             legacy.u.dump = opts->u.dump;
1026             break;
1027         case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1028             legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1029             legacy.u.bridge = opts->u.bridge;
1030             break;
1031         case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1032             legacy.type = NET_CLIENT_DRIVER_NETMAP;
1033             legacy.u.netmap = opts->u.netmap;
1034             break;
1035         case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1036             legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1037             legacy.u.vhost_user = opts->u.vhost_user;
1038             break;
1039         default:
1040             abort();
1041         }
1042
1043         if (!net_client_init_fun[netdev->type]) {
1044             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1045                        "a net backend type (maybe it is not compiled "
1046                        "into this binary)");
1047             return -1;
1048         }
1049
1050         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1051         if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1052             !opts->u.nic.has_netdev) {
1053             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1054         }
1055
1056         if (net->has_vlan && !vlan_warned) {
1057             error_report("'vlan' is deprecated. Please use 'netdev' instead.");
1058             vlan_warned = true;
1059         }
1060     }
1061
1062     if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1063         /* FIXME drop when all init functions store an Error */
1064         if (errp && !*errp) {
1065             error_setg(errp, QERR_DEVICE_INIT_FAILED,
1066                        NetClientDriver_lookup[netdev->type]);
1067         }
1068         return -1;
1069     }
1070     return 0;
1071 }
1072
1073
1074 int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1075 {
1076     void *object = NULL;
1077     Error *err = NULL;
1078     int ret = -1;
1079     Visitor *v = opts_visitor_new(opts);
1080
1081     {
1082         /* Parse convenience option format ip6-net=fec0::0[/64] */
1083         const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1084
1085         if (ip6_net) {
1086             char buf[strlen(ip6_net) + 1];
1087
1088             if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1089                 /* Default 64bit prefix length.  */
1090                 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1091                 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1092             } else {
1093                 /* User-specified prefix length.  */
1094                 unsigned long len;
1095                 int err;
1096
1097                 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1098                 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1099
1100                 if (err) {
1101                     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1102                               "ipv6-prefix", "a number");
1103                 } else {
1104                     qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1105                                         &error_abort);
1106                 }
1107             }
1108             qemu_opt_unset(opts, "ipv6-net");
1109         }
1110     }
1111
1112     if (is_netdev) {
1113         visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1114     } else {
1115         visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1116     }
1117
1118     if (!err) {
1119         ret = net_client_init1(object, is_netdev, &err);
1120     }
1121
1122     if (is_netdev) {
1123         qapi_free_Netdev(object);
1124     } else {
1125         qapi_free_NetLegacy(object);
1126     }
1127
1128     error_propagate(errp, err);
1129     visit_free(v);
1130     return ret;
1131 }
1132
1133
1134 static int net_host_check_device(const char *device)
1135 {
1136     int i;
1137     for (i = 0; host_net_devices[i]; i++) {
1138         if (!strncmp(host_net_devices[i], device,
1139                      strlen(host_net_devices[i]))) {
1140             return 1;
1141         }
1142     }
1143
1144     return 0;
1145 }
1146
1147 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1148 {
1149     const char *device = qdict_get_str(qdict, "device");
1150     const char *opts_str = qdict_get_try_str(qdict, "opts");
1151     Error *local_err = NULL;
1152     QemuOpts *opts;
1153     static bool warned;
1154
1155     if (!warned && !qtest_enabled()) {
1156         error_report("host_net_add is deprecated, use netdev_add instead");
1157         warned = true;
1158     }
1159
1160     if (!net_host_check_device(device)) {
1161         monitor_printf(mon, "invalid host network device %s\n", device);
1162         return;
1163     }
1164
1165     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1166                                    opts_str ? opts_str : "", false);
1167     if (!opts) {
1168         return;
1169     }
1170
1171     qemu_opt_set(opts, "type", device, &error_abort);
1172
1173     net_client_init(opts, false, &local_err);
1174     if (local_err) {
1175         error_report_err(local_err);
1176         monitor_printf(mon, "adding host network device %s failed\n", device);
1177     }
1178 }
1179
1180 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1181 {
1182     NetClientState *nc;
1183     int vlan_id = qdict_get_int(qdict, "vlan_id");
1184     const char *device = qdict_get_str(qdict, "device");
1185     static bool warned;
1186
1187     if (!warned && !qtest_enabled()) {
1188         error_report("host_net_remove is deprecated, use netdev_del instead");
1189         warned = true;
1190     }
1191
1192     nc = net_hub_find_client_by_name(vlan_id, device);
1193     if (!nc) {
1194         error_report("Host network device '%s' on hub '%d' not found",
1195                      device, vlan_id);
1196         return;
1197     }
1198     if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1199         error_report("invalid host network device '%s'", device);
1200         return;
1201     }
1202
1203     qemu_del_net_client(nc->peer);
1204     qemu_del_net_client(nc);
1205     qemu_opts_del(qemu_opts_find(qemu_find_opts("net"), device));
1206 }
1207
1208 void netdev_add(QemuOpts *opts, Error **errp)
1209 {
1210     net_client_init(opts, true, errp);
1211 }
1212
1213 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1214 {
1215     Error *local_err = NULL;
1216     QemuOptsList *opts_list;
1217     QemuOpts *opts;
1218
1219     opts_list = qemu_find_opts_err("netdev", &local_err);
1220     if (local_err) {
1221         goto out;
1222     }
1223
1224     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1225     if (local_err) {
1226         goto out;
1227     }
1228
1229     netdev_add(opts, &local_err);
1230     if (local_err) {
1231         qemu_opts_del(opts);
1232         goto out;
1233     }
1234
1235 out:
1236     error_propagate(errp, local_err);
1237 }
1238
1239 void qmp_netdev_del(const char *id, Error **errp)
1240 {
1241     NetClientState *nc;
1242     QemuOpts *opts;
1243
1244     nc = qemu_find_netdev(id);
1245     if (!nc) {
1246         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1247                   "Device '%s' not found", id);
1248         return;
1249     }
1250
1251     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1252     if (!opts) {
1253         error_setg(errp, "Device '%s' is not a netdev", id);
1254         return;
1255     }
1256
1257     qemu_del_net_client(nc);
1258     qemu_opts_del(opts);
1259 }
1260
1261 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1262 {
1263     char *str;
1264     ObjectProperty *prop;
1265     ObjectPropertyIterator iter;
1266     Visitor *v;
1267
1268     /* generate info str */
1269     object_property_iter_init(&iter, OBJECT(nf));
1270     while ((prop = object_property_iter_next(&iter))) {
1271         if (!strcmp(prop->name, "type")) {
1272             continue;
1273         }
1274         v = string_output_visitor_new(false, &str);
1275         object_property_get(OBJECT(nf), v, prop->name, NULL);
1276         visit_complete(v, &str);
1277         visit_free(v);
1278         monitor_printf(mon, ",%s=%s", prop->name, str);
1279         g_free(str);
1280     }
1281     monitor_printf(mon, "\n");
1282 }
1283
1284 void print_net_client(Monitor *mon, NetClientState *nc)
1285 {
1286     NetFilterState *nf;
1287
1288     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1289                    nc->queue_index,
1290                    NetClientDriver_lookup[nc->info->type],
1291                    nc->info_str);
1292     if (!QTAILQ_EMPTY(&nc->filters)) {
1293         monitor_printf(mon, "filters:\n");
1294     }
1295     QTAILQ_FOREACH(nf, &nc->filters, next) {
1296         char *path = object_get_canonical_path_component(OBJECT(nf));
1297
1298         monitor_printf(mon, "  - %s: type=%s", path,
1299                        object_get_typename(OBJECT(nf)));
1300         netfilter_print_info(mon, nf);
1301         g_free(path);
1302     }
1303 }
1304
1305 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1306                                       Error **errp)
1307 {
1308     NetClientState *nc;
1309     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1310
1311     QTAILQ_FOREACH(nc, &net_clients, next) {
1312         RxFilterInfoList *entry;
1313         RxFilterInfo *info;
1314
1315         if (has_name && strcmp(nc->name, name) != 0) {
1316             continue;
1317         }
1318
1319         /* only query rx-filter information of NIC */
1320         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1321             if (has_name) {
1322                 error_setg(errp, "net client(%s) isn't a NIC", name);
1323                 return NULL;
1324             }
1325             continue;
1326         }
1327
1328         /* only query information on queue 0 since the info is per nic,
1329          * not per queue
1330          */
1331         if (nc->queue_index != 0)
1332             continue;
1333
1334         if (nc->info->query_rx_filter) {
1335             info = nc->info->query_rx_filter(nc);
1336             entry = g_malloc0(sizeof(*entry));
1337             entry->value = info;
1338
1339             if (!filter_list) {
1340                 filter_list = entry;
1341             } else {
1342                 last_entry->next = entry;
1343             }
1344             last_entry = entry;
1345         } else if (has_name) {
1346             error_setg(errp, "net client(%s) doesn't support"
1347                        " rx-filter querying", name);
1348             return NULL;
1349         }
1350
1351         if (has_name) {
1352             break;
1353         }
1354     }
1355
1356     if (filter_list == NULL && has_name) {
1357         error_setg(errp, "invalid net client name: %s", name);
1358     }
1359
1360     return filter_list;
1361 }
1362
1363 void hmp_info_network(Monitor *mon, const QDict *qdict)
1364 {
1365     NetClientState *nc, *peer;
1366     NetClientDriver type;
1367
1368     net_hub_info(mon);
1369
1370     QTAILQ_FOREACH(nc, &net_clients, next) {
1371         peer = nc->peer;
1372         type = nc->info->type;
1373
1374         /* Skip if already printed in hub info */
1375         if (net_hub_id_for_client(nc, NULL) == 0) {
1376             continue;
1377         }
1378
1379         if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1380             print_net_client(mon, nc);
1381         } /* else it's a netdev connected to a NIC, printed with the NIC */
1382         if (peer && type == NET_CLIENT_DRIVER_NIC) {
1383             monitor_printf(mon, " \\ ");
1384             print_net_client(mon, peer);
1385         }
1386     }
1387 }
1388
1389 void qmp_set_link(const char *name, bool up, Error **errp)
1390 {
1391     NetClientState *ncs[MAX_QUEUE_NUM];
1392     NetClientState *nc;
1393     int queues, i;
1394
1395     queues = qemu_find_net_clients_except(name, ncs,
1396                                           NET_CLIENT_DRIVER__MAX,
1397                                           MAX_QUEUE_NUM);
1398
1399     if (queues == 0) {
1400         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1401                   "Device '%s' not found", name);
1402         return;
1403     }
1404     nc = ncs[0];
1405
1406     for (i = 0; i < queues; i++) {
1407         ncs[i]->link_down = !up;
1408     }
1409
1410     if (nc->info->link_status_changed) {
1411         nc->info->link_status_changed(nc);
1412     }
1413
1414     if (nc->peer) {
1415         /* Change peer link only if the peer is NIC and then notify peer.
1416          * If the peer is a HUBPORT or a backend, we do not change the
1417          * link status.
1418          *
1419          * This behavior is compatible with qemu vlans where there could be
1420          * multiple clients that can still communicate with each other in
1421          * disconnected mode. For now maintain this compatibility.
1422          */
1423         if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1424             for (i = 0; i < queues; i++) {
1425                 ncs[i]->peer->link_down = !up;
1426             }
1427         }
1428         if (nc->peer->info->link_status_changed) {
1429             nc->peer->info->link_status_changed(nc->peer);
1430         }
1431     }
1432 }
1433
1434 static void net_vm_change_state_handler(void *opaque, int running,
1435                                         RunState state)
1436 {
1437     NetClientState *nc;
1438     NetClientState *tmp;
1439
1440     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1441         if (running) {
1442             /* Flush queued packets and wake up backends. */
1443             if (nc->peer && qemu_can_send_packet(nc)) {
1444                 qemu_flush_queued_packets(nc->peer);
1445             }
1446         } else {
1447             /* Complete all queued packets, to guarantee we don't modify
1448              * state later when VM is not running.
1449              */
1450             qemu_flush_or_purge_queued_packets(nc, true);
1451         }
1452     }
1453 }
1454
1455 void net_cleanup(void)
1456 {
1457     NetClientState *nc;
1458
1459     /* We may del multiple entries during qemu_del_net_client(),
1460      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1461      */
1462     while (!QTAILQ_EMPTY(&net_clients)) {
1463         nc = QTAILQ_FIRST(&net_clients);
1464         if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1465             qemu_del_nic(qemu_get_nic(nc));
1466         } else {
1467             qemu_del_net_client(nc);
1468         }
1469     }
1470
1471     qemu_del_vm_change_state_handler(net_change_state_entry);
1472 }
1473
1474 void net_check_clients(void)
1475 {
1476     NetClientState *nc;
1477     int i;
1478
1479     net_hub_check_clients();
1480
1481     QTAILQ_FOREACH(nc, &net_clients, next) {
1482         if (!nc->peer) {
1483             fprintf(stderr, "Warning: %s %s has no peer\n",
1484                     nc->info->type == NET_CLIENT_DRIVER_NIC ?
1485                     "nic" : "netdev", nc->name);
1486         }
1487     }
1488
1489     /* Check that all NICs requested via -net nic actually got created.
1490      * NICs created via -device don't need to be checked here because
1491      * they are always instantiated.
1492      */
1493     for (i = 0; i < MAX_NICS; i++) {
1494         NICInfo *nd = &nd_table[i];
1495         if (nd->used && !nd->instantiated) {
1496             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1497                     "was not created (not supported by this machine?)\n",
1498                     nd->name ? nd->name : "anonymous",
1499                     nd->model ? nd->model : "unspecified");
1500         }
1501     }
1502 }
1503
1504 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1505 {
1506     Error *local_err = NULL;
1507
1508     net_client_init(opts, false, &local_err);
1509     if (local_err) {
1510         error_report_err(local_err);
1511         return -1;
1512     }
1513
1514     return 0;
1515 }
1516
1517 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1518 {
1519     Error *local_err = NULL;
1520     int ret;
1521
1522     ret = net_client_init(opts, true, &local_err);
1523     if (local_err) {
1524         error_report_err(local_err);
1525         return -1;
1526     }
1527
1528     return ret;
1529 }
1530
1531 int net_init_clients(void)
1532 {
1533     QemuOptsList *net = qemu_find_opts("net");
1534
1535     net_change_state_entry =
1536         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1537
1538     QTAILQ_INIT(&net_clients);
1539
1540     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1541                           net_init_netdev, NULL, NULL)) {
1542         return -1;
1543     }
1544
1545     if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1546         return -1;
1547     }
1548
1549     return 0;
1550 }
1551
1552 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1553 {
1554 #if defined(CONFIG_SLIRP)
1555     int ret;
1556     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1557         return ret;
1558     }
1559 #endif
1560
1561     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1562         return -1;
1563     }
1564
1565     return 0;
1566 }
1567
1568 /* From FreeBSD */
1569 /* XXX: optimize */
1570 unsigned compute_mcast_idx(const uint8_t *ep)
1571 {
1572     uint32_t crc;
1573     int carry, i, j;
1574     uint8_t b;
1575
1576     crc = 0xffffffff;
1577     for (i = 0; i < 6; i++) {
1578         b = *ep++;
1579         for (j = 0; j < 8; j++) {
1580             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1581             crc <<= 1;
1582             b >>= 1;
1583             if (carry) {
1584                 crc = ((crc ^ POLYNOMIAL) | carry);
1585             }
1586         }
1587     }
1588     return crc >> 26;
1589 }
1590
1591 QemuOptsList qemu_netdev_opts = {
1592     .name = "netdev",
1593     .implied_opt_name = "type",
1594     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1595     .desc = {
1596         /*
1597          * no elements => accept any params
1598          * validation will happen later
1599          */
1600         { /* end of list */ }
1601     },
1602 };
1603
1604 QemuOptsList qemu_net_opts = {
1605     .name = "net",
1606     .implied_opt_name = "type",
1607     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1608     .desc = {
1609         /*
1610          * no elements => accept any params
1611          * validation will happen later
1612          */
1613         { /* end of list */ }
1614     },
1615 };
1616
1617 void net_socket_rs_init(SocketReadState *rs,
1618                         SocketReadStateFinalize *finalize)
1619 {
1620     rs->state = 0;
1621     rs->index = 0;
1622     rs->packet_len = 0;
1623     memset(rs->buf, 0, sizeof(rs->buf));
1624     rs->finalize = finalize;
1625 }
1626
1627 /*
1628  * Returns
1629  * 0: success
1630  * -1: error occurs
1631  */
1632 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1633 {
1634     unsigned int l;
1635
1636     while (size > 0) {
1637         /* reassemble a packet from the network */
1638         switch (rs->state) { /* 0 = getting length, 1 = getting data */
1639         case 0:
1640             l = 4 - rs->index;
1641             if (l > size) {
1642                 l = size;
1643             }
1644             memcpy(rs->buf + rs->index, buf, l);
1645             buf += l;
1646             size -= l;
1647             rs->index += l;
1648             if (rs->index == 4) {
1649                 /* got length */
1650                 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1651                 rs->index = 0;
1652                 rs->state = 1;
1653             }
1654             break;
1655         case 1:
1656             l = rs->packet_len - rs->index;
1657             if (l > size) {
1658                 l = size;
1659             }
1660             if (rs->index + l <= sizeof(rs->buf)) {
1661                 memcpy(rs->buf + rs->index, buf, l);
1662             } else {
1663                 fprintf(stderr, "serious error: oversized packet received,"
1664                     "connection terminated.\n");
1665                 rs->index = rs->state = 0;
1666                 return -1;
1667             }
1668
1669             rs->index += l;
1670             buf += l;
1671             size -= l;
1672             if (rs->index >= rs->packet_len) {
1673                 rs->index = 0;
1674                 rs->state = 0;
1675                 assert(rs->finalize);
1676                 rs->finalize(rs);
1677             }
1678             break;
1679         }
1680     }
1681
1682     assert(size == 0);
1683     return 0;
1684 }