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 "config-host.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/sockets.h"
  36 #include "qemu/config-file.h"
  37 #include "qmp-commands.h"
  38 #include "hw/qdev.h"
  39 #include "qemu/iov.h"
  40 #include "qemu/main-loop.h"
  41 #include "qapi-visit.h"
  42 #include "qapi/opts-visitor.h"
  43 #include "qapi/dealloc-visitor.h"
  44
  45 /* Net bridge is currently not supported for W32. */
  46 #if !defined(_WIN32)
  47 # define CONFIG_NET_BRIDGE
  48 #endif
  49
  50 static QTAILQ_HEAD(, NetClientState) net_clients;
  51
  52 int default_net = 1;
  53
  54 /***********************************************************/
  55 /* network device redirectors */
  56
  57 #if defined(DEBUG_NET)
  58 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  59 {
  60     int len, i, j, c;
  61
  62     for(i=0;i<size;i+=16) {
  63         len = size - i;
  64         if (len > 16)
  65             len = 16;
  66         fprintf(f, "%08x ", i);
  67         for(j=0;j<16;j++) {
  68             if (j < len)
  69                 fprintf(f, " %02x", buf[i+j]);
  70             else
  71                 fprintf(f, "   ");
  72         }
  73         fprintf(f, " ");
  74         for(j=0;j<len;j++) {
  75             c = buf[i+j];
  76             if (c < ' ' || c > '~')
  77                 c = '.';
  78             fprintf(f, "%c", c);
  79         }
  80         fprintf(f, "\n");
  81     }
  82 }
  83 #endif
  84
  85 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  86 {
  87     const char *p, *p1;
  88     int len;
  89     p = *pp;
  90     p1 = strchr(p, sep);
  91     if (!p1)
  92         return -1;
  93     len = p1 - p;
  94     p1++;
  95     if (buf_size > 0) {
  96         if (len > buf_size - 1)
  97             len = buf_size - 1;
  98         memcpy(buf, p, len);
  99         buf[len] = '\0';
 100     }
 101     *pp = p1;
 102     return 0;
 103 }
 104
 105 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 106 {
 107     char buf[512];
 108     struct hostent *he;
 109     const char *p, *r;
 110     int port;
 111
 112     p = str;
 113     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 114         return -1;
 115     saddr->sin_family = AF_INET;
 116     if (buf[0] == '\0') {
 117         saddr->sin_addr.s_addr = 0;
 118     } else {
 119         if (qemu_isdigit(buf[0])) {
 120             if (!inet_aton(buf, &saddr->sin_addr))
 121                 return -1;
 122         } else {
 123             if ((he = gethostbyname(buf)) == NULL)
 124                 return - 1;
 125             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 126         }
 127     }
 128     port = strtol(p, (char **)&r, 0);
 129     if (r == p)
 130         return -1;
 131     saddr->sin_port = htons(port);
 132     return 0;
 133 }
 134
 135 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 136 {
 137     snprintf(nc->info_str, sizeof(nc->info_str),
 138              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 139              nc->model,
 140              macaddr[0], macaddr[1], macaddr[2],
 141              macaddr[3], macaddr[4], macaddr[5]);
 142 }
 143
 144 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 145 {
 146     static int index = 0;
 147     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 148
 149     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 150         return;
 151     macaddr->a[0] = 0x52;
 152     macaddr->a[1] = 0x54;
 153     macaddr->a[2] = 0x00;
 154     macaddr->a[3] = 0x12;
 155     macaddr->a[4] = 0x34;
 156     macaddr->a[5] = 0x56 + index++;
 157 }
 158
 159 /**
 160  * Generate a name for net client
 161  *
 162  * Only net clients created with the legacy -net option and NICs need this.
 163  */
 164 static char *assign_name(NetClientState *nc1, const char *model)
 165 {
 166     NetClientState *nc;
 167     char buf[256];
 168     int id = 0;
 169
 170     QTAILQ_FOREACH(nc, &net_clients, next) {
 171         if (nc == nc1) {
 172             continue;
 173         }
 174         if (strcmp(nc->model, model) == 0) {
 175             id++;
 176         }
 177     }
 178
 179     snprintf(buf, sizeof(buf), "%s.%d", model, id);
 180
 181     return g_strdup(buf);
 182 }
 183
 184 static void qemu_net_client_destructor(NetClientState *nc)
 185 {
 186     g_free(nc);
 187 }
 188
 189 static void qemu_net_client_setup(NetClientState *nc,
 190                                   NetClientInfo *info,
 191                                   NetClientState *peer,
 192                                   const char *model,
 193                                   const char *name,
 194                                   NetClientDestructor *destructor)
 195 {
 196     nc->info = info;
 197     nc->model = g_strdup(model);
 198     if (name) {
 199         nc->name = g_strdup(name);
 200     } else {
 201         nc->name = assign_name(nc, model);
 202     }
 203
 204     if (peer) {
 205         assert(!peer->peer);
 206         nc->peer = peer;
 207         peer->peer = nc;
 208     }
 209     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 210
 211     nc->incoming_queue = qemu_new_net_queue(nc);
 212     nc->destructor = destructor;
 213 }
 214
 215 NetClientState *qemu_new_net_client(NetClientInfo *info,
 216                                     NetClientState *peer,
 217                                     const char *model,
 218                                     const char *name)
 219 {
 220     NetClientState *nc;
 221
 222     assert(info->size >= sizeof(NetClientState));
 223
 224     nc = g_malloc0(info->size);
 225     qemu_net_client_setup(nc, info, peer, model, name,
 226                           qemu_net_client_destructor);
 227
 228     return nc;
 229 }
 230
 231 NICState *qemu_new_nic(NetClientInfo *info,
 232                        NICConf *conf,
 233                        const char *model,
 234                        const char *name,
 235                        void *opaque)
 236 {
 237     NetClientState **peers = conf->peers.ncs;
 238     NICState *nic;
 239     int i, queues = MAX(1, conf->queues);
 240
 241     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 242     assert(info->size >= sizeof(NICState));
 243
 244     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 245     nic->ncs = (void *)nic + info->size;
 246     nic->conf = conf;
 247     nic->opaque = opaque;
 248
 249     for (i = 0; i < queues; i++) {
 250         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 251                               NULL);
 252         nic->ncs[i].queue_index = i;
 253     }
 254
 255     return nic;
 256 }
 257
 258 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 259 {
 260     return nic->ncs + queue_index;
 261 }
 262
 263 NetClientState *qemu_get_queue(NICState *nic)
 264 {
 265     return qemu_get_subqueue(nic, 0);
 266 }
 267
 268 NICState *qemu_get_nic(NetClientState *nc)
 269 {
 270     NetClientState *nc0 = nc - nc->queue_index;
 271
 272     return (NICState *)((void *)nc0 - nc->info->size);
 273 }
 274
 275 void *qemu_get_nic_opaque(NetClientState *nc)
 276 {
 277     NICState *nic = qemu_get_nic(nc);
 278
 279     return nic->opaque;
 280 }
 281
 282 static void qemu_cleanup_net_client(NetClientState *nc)
 283 {
 284     QTAILQ_REMOVE(&net_clients, nc, next);
 285
 286     if (nc->info->cleanup) {
 287         nc->info->cleanup(nc);
 288     }
 289 }
 290
 291 static void qemu_free_net_client(NetClientState *nc)
 292 {
 293     if (nc->incoming_queue) {
 294         qemu_del_net_queue(nc->incoming_queue);
 295     }
 296     if (nc->peer) {
 297         nc->peer->peer = NULL;
 298     }
 299     g_free(nc->name);
 300     g_free(nc->model);
 301     if (nc->destructor) {
 302         nc->destructor(nc);
 303     }
 304 }
 305
 306 void qemu_del_net_client(NetClientState *nc)
 307 {
 308     NetClientState *ncs[MAX_QUEUE_NUM];
 309     int queues, i;
 310
 311     /* If the NetClientState belongs to a multiqueue backend, we will change all
 312      * other NetClientStates also.
 313      */
 314     queues = qemu_find_net_clients_except(nc->name, ncs,
 315                                           NET_CLIENT_OPTIONS_KIND_NIC,
 316                                           MAX_QUEUE_NUM);
 317     assert(queues != 0);
 318
 319     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 320     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 321         NICState *nic = qemu_get_nic(nc->peer);
 322         if (nic->peer_deleted) {
 323             return;
 324         }
 325         nic->peer_deleted = true;
 326
 327         for (i = 0; i < queues; i++) {
 328             ncs[i]->peer->link_down = true;
 329         }
 330
 331         if (nc->peer->info->link_status_changed) {
 332             nc->peer->info->link_status_changed(nc->peer);
 333         }
 334
 335         for (i = 0; i < queues; i++) {
 336             qemu_cleanup_net_client(ncs[i]);
 337         }
 338
 339         return;
 340     }
 341
 342     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 343
 344     for (i = 0; i < queues; i++) {
 345         qemu_cleanup_net_client(ncs[i]);
 346         qemu_free_net_client(ncs[i]);
 347     }
 348 }
 349
 350 void qemu_del_nic(NICState *nic)
 351 {
 352     int i, queues = MAX(nic->conf->queues, 1);
 353
 354     /* If this is a peer NIC and peer has already been deleted, free it now. */
 355     if (nic->peer_deleted) {
 356         for (i = 0; i < queues; i++) {
 357             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 358         }
 359     }
 360
 361     for (i = queues - 1; i >= 0; i--) {
 362         NetClientState *nc = qemu_get_subqueue(nic, i);
 363
 364         qemu_cleanup_net_client(nc);
 365         qemu_free_net_client(nc);
 366     }
 367
 368     g_free(nic);
 369 }
 370
 371 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 372 {
 373     NetClientState *nc;
 374
 375     QTAILQ_FOREACH(nc, &net_clients, next) {
 376         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 377             if (nc->queue_index == 0) {
 378                 func(qemu_get_nic(nc), opaque);
 379             }
 380         }
 381     }
 382 }
 383
 384 int qemu_can_send_packet(NetClientState *sender)
 385 {
 386     if (!sender->peer) {
 387         return 1;
 388     }
 389
 390     if (sender->peer->receive_disabled) {
 391         return 0;
 392     } else if (sender->peer->info->can_receive &&
 393                !sender->peer->info->can_receive(sender->peer)) {
 394         return 0;
 395     }
 396     return 1;
 397 }
 398
 399 ssize_t qemu_deliver_packet(NetClientState *sender,
 400                             unsigned flags,
 401                             const uint8_t *data,
 402                             size_t size,
 403                             void *opaque)
 404 {
 405     NetClientState *nc = opaque;
 406     ssize_t ret;
 407
 408     if (nc->link_down) {
 409         return size;
 410     }
 411
 412     if (nc->receive_disabled) {
 413         return 0;
 414     }
 415
 416     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 417         ret = nc->info->receive_raw(nc, data, size);
 418     } else {
 419         ret = nc->info->receive(nc, data, size);
 420     }
 421
 422     if (ret == 0) {
 423         nc->receive_disabled = 1;
 424     };
 425
 426     return ret;
 427 }
 428
 429 void qemu_purge_queued_packets(NetClientState *nc)
 430 {
 431     if (!nc->peer) {
 432         return;
 433     }
 434
 435     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 436 }
 437
 438 void qemu_flush_queued_packets(NetClientState *nc)
 439 {
 440     nc->receive_disabled = 0;
 441
 442     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 443         if (net_hub_flush(nc->peer)) {
 444             qemu_notify_event();
 445         }
 446     }
 447     if (qemu_net_queue_flush(nc->incoming_queue)) {
 448         /* We emptied the queue successfully, signal to the IO thread to repoll
 449          * the file descriptor (for tap, for example).
 450          */
 451         qemu_notify_event();
 452     }
 453 }
 454
 455 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 456                                                  unsigned flags,
 457                                                  const uint8_t *buf, int size,
 458                                                  NetPacketSent *sent_cb)
 459 {
 460     NetQueue *queue;
 461
 462 #ifdef DEBUG_NET
 463     printf("qemu_send_packet_async:\n");
 464     hex_dump(stdout, buf, size);
 465 #endif
 466
 467     if (sender->link_down || !sender->peer) {
 468         return size;
 469     }
 470
 471     queue = sender->peer->incoming_queue;
 472
 473     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 474 }
 475
 476 ssize_t qemu_send_packet_async(NetClientState *sender,
 477                                const uint8_t *buf, int size,
 478                                NetPacketSent *sent_cb)
 479 {
 480     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 481                                              buf, size, sent_cb);
 482 }
 483
 484 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 485 {
 486     qemu_send_packet_async(nc, buf, size, NULL);
 487 }
 488
 489 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 490 {
 491     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 492                                              buf, size, NULL);
 493 }
 494
 495 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 496                                int iovcnt)
 497 {
 498     uint8_t buffer[NET_BUFSIZE];
 499     size_t offset;
 500
 501     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 502
 503     return nc->info->receive(nc, buffer, offset);
 504 }
 505
 506 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 507                                 unsigned flags,
 508                                 const struct iovec *iov,
 509                                 int iovcnt,
 510                                 void *opaque)
 511 {
 512     NetClientState *nc = opaque;
 513     int ret;
 514
 515     if (nc->link_down) {
 516         return iov_size(iov, iovcnt);
 517     }
 518
 519     if (nc->receive_disabled) {
 520         return 0;
 521     }
 522
 523     if (nc->info->receive_iov) {
 524         ret = nc->info->receive_iov(nc, iov, iovcnt);
 525     } else {
 526         ret = nc_sendv_compat(nc, iov, iovcnt);
 527     }
 528
 529     if (ret == 0) {
 530         nc->receive_disabled = 1;
 531     }
 532
 533     return ret;
 534 }
 535
 536 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 537                                 const struct iovec *iov, int iovcnt,
 538                                 NetPacketSent *sent_cb)
 539 {
 540     NetQueue *queue;
 541
 542     if (sender->link_down || !sender->peer) {
 543         return iov_size(iov, iovcnt);
 544     }
 545
 546     queue = sender->peer->incoming_queue;
 547
 548     return qemu_net_queue_send_iov(queue, sender,
 549                                    QEMU_NET_PACKET_FLAG_NONE,
 550                                    iov, iovcnt, sent_cb);
 551 }
 552
 553 ssize_t
 554 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 555 {
 556     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 557 }
 558
 559 NetClientState *qemu_find_netdev(const char *id)
 560 {
 561     NetClientState *nc;
 562
 563     QTAILQ_FOREACH(nc, &net_clients, next) {
 564         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 565             continue;
 566         if (!strcmp(nc->name, id)) {
 567             return nc;
 568         }
 569     }
 570
 571     return NULL;
 572 }
 573
 574 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 575                                  NetClientOptionsKind type, int max)
 576 {
 577     NetClientState *nc;
 578     int ret = 0;
 579
 580     QTAILQ_FOREACH(nc, &net_clients, next) {
 581         if (nc->info->type == type) {
 582             continue;
 583         }
 584         if (!strcmp(nc->name, id)) {
 585             if (ret < max) {
 586                 ncs[ret] = nc;
 587             }
 588             ret++;
 589         }
 590     }
 591
 592     return ret;
 593 }
 594
 595 static int nic_get_free_idx(void)
 596 {
 597     int index;
 598
 599     for (index = 0; index < MAX_NICS; index++)
 600         if (!nd_table[index].used)
 601             return index;
 602     return -1;
 603 }
 604
 605 int qemu_show_nic_models(const char *arg, const char *const *models)
 606 {
 607     int i;
 608
 609     if (!arg || !is_help_option(arg)) {
 610         return 0;
 611     }
 612
 613     fprintf(stderr, "qemu: Supported NIC models: ");
 614     for (i = 0 ; models[i]; i++)
 615         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 616     return 1;
 617 }
 618
 619 void qemu_check_nic_model(NICInfo *nd, const char *model)
 620 {
 621     const char *models[2];
 622
 623     models[0] = model;
 624     models[1] = NULL;
 625
 626     if (qemu_show_nic_models(nd->model, models))
 627         exit(0);
 628     if (qemu_find_nic_model(nd, models, model) < 0)
 629         exit(1);
 630 }
 631
 632 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 633                         const char *default_model)
 634 {
 635     int i;
 636
 637     if (!nd->model)
 638         nd->model = g_strdup(default_model);
 639
 640     for (i = 0 ; models[i]; i++) {
 641         if (strcmp(nd->model, models[i]) == 0)
 642             return i;
 643     }
 644
 645     error_report("Unsupported NIC model: %s", nd->model);
 646     return -1;
 647 }
 648
 649 static int net_init_nic(const NetClientOptions *opts, const char *name,
 650                         NetClientState *peer)
 651 {
 652     int idx;
 653     NICInfo *nd;
 654     const NetLegacyNicOptions *nic;
 655
 656     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 657     nic = opts->nic;
 658
 659     idx = nic_get_free_idx();
 660     if (idx == -1 || nb_nics >= MAX_NICS) {
 661         error_report("Too Many NICs");
 662         return -1;
 663     }
 664
 665     nd = &nd_table[idx];
 666
 667     memset(nd, 0, sizeof(*nd));
 668
 669     if (nic->has_netdev) {
 670         nd->netdev = qemu_find_netdev(nic->netdev);
 671         if (!nd->netdev) {
 672             error_report("netdev '%s' not found", nic->netdev);
 673             return -1;
 674         }
 675     } else {
 676         assert(peer);
 677         nd->netdev = peer;
 678     }
 679     nd->name = g_strdup(name);
 680     if (nic->has_model) {
 681         nd->model = g_strdup(nic->model);
 682     }
 683     if (nic->has_addr) {
 684         nd->devaddr = g_strdup(nic->addr);
 685     }
 686
 687     if (nic->has_macaddr &&
 688         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 689         error_report("invalid syntax for ethernet address");
 690         return -1;
 691     }
 692     if (nic->has_macaddr &&
 693         is_multicast_ether_addr(nd->macaddr.a)) {
 694         error_report("NIC cannot have multicast MAC address (odd 1st byte)");
 695         return -1;
 696     }
 697     qemu_macaddr_default_if_unset(&nd->macaddr);
 698
 699     if (nic->has_vectors) {
 700         if (nic->vectors > 0x7ffffff) {
 701             error_report("invalid # of vectors: %"PRIu32, nic->vectors);
 702             return -1;
 703         }
 704         nd->nvectors = nic->vectors;
 705     } else {
 706         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 707     }
 708
 709     nd->used = 1;
 710     nb_nics++;
 711
 712     return idx;
 713 }
 714
 715
 716 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 717     const NetClientOptions *opts,
 718     const char *name,
 719     NetClientState *peer) = {
 720         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 721 #ifdef CONFIG_SLIRP
 722         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 723 #endif
 724         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 725         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 726 #ifdef CONFIG_VDE
 727         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 728 #endif
 729         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 730 #ifdef CONFIG_NET_BRIDGE
 731         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 732 #endif
 733         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 734 };
 735
 736
 737 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 738 {
 739     union {
 740         const Netdev    *netdev;
 741         const NetLegacy *net;
 742     } u;
 743     const NetClientOptions *opts;
 744     const char *name;
 745
 746     if (is_netdev) {
 747         u.netdev = object;
 748         opts = u.netdev->opts;
 749         name = u.netdev->id;
 750
 751         switch (opts->kind) {
 752 #ifdef CONFIG_SLIRP
 753         case NET_CLIENT_OPTIONS_KIND_USER:
 754 #endif
 755         case NET_CLIENT_OPTIONS_KIND_TAP:
 756         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 757 #ifdef CONFIG_VDE
 758         case NET_CLIENT_OPTIONS_KIND_VDE:
 759 #endif
 760 #ifdef CONFIG_NET_BRIDGE
 761         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 762 #endif
 763         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 764             break;
 765
 766         default:
 767             error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 768                       "a netdev backend type");
 769             return -1;
 770         }
 771     } else {
 772         u.net = object;
 773         opts = u.net->opts;
 774         /* missing optional values have been initialized to "all bits zero" */
 775         name = u.net->has_id ? u.net->id : u.net->name;
 776     }
 777
 778     if (net_client_init_fun[opts->kind]) {
 779         NetClientState *peer = NULL;
 780
 781         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 782          * parameter. */
 783         if (!is_netdev &&
 784             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 785              !opts->nic->has_netdev)) {
 786             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 787         }
 788
 789         if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
 790             /* TODO push error reporting into init() methods */
 791             error_set(errp, QERR_DEVICE_INIT_FAILED,
 792                       NetClientOptionsKind_lookup[opts->kind]);
 793             return -1;
 794         }
 795     }
 796     return 0;
 797 }
 798
 799
 800 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 801 {
 802     if (is_netdev) {
 803         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 804     } else {
 805         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 806     }
 807 }
 808
 809
 810 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 811 {
 812     void *object = NULL;
 813     Error *err = NULL;
 814     int ret = -1;
 815
 816     {
 817         OptsVisitor *ov = opts_visitor_new(opts);
 818
 819         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 820         opts_visitor_cleanup(ov);
 821     }
 822
 823     if (!err) {
 824         ret = net_client_init1(object, is_netdev, &err);
 825     }
 826
 827     if (object) {
 828         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
 829
 830         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
 831         qapi_dealloc_visitor_cleanup(dv);
 832     }
 833
 834     error_propagate(errp, err);
 835     return ret;
 836 }
 837
 838
 839 static int net_host_check_device(const char *device)
 840 {
 841     int i;
 842     const char *valid_param_list[] = { "tap", "socket", "dump"
 843 #ifdef CONFIG_NET_BRIDGE
 844                                        , "bridge"
 845 #endif
 846 #ifdef CONFIG_SLIRP
 847                                        ,"user"
 848 #endif
 849 #ifdef CONFIG_VDE
 850                                        ,"vde"
 851 #endif
 852     };
 853     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
 854         if (!strncmp(valid_param_list[i], device,
 855                      strlen(valid_param_list[i])))
 856             return 1;
 857     }
 858
 859     return 0;
 860 }
 861
 862 void net_host_device_add(Monitor *mon, const QDict *qdict)
 863 {
 864     const char *device = qdict_get_str(qdict, "device");
 865     const char *opts_str = qdict_get_try_str(qdict, "opts");
 866     Error *local_err = NULL;
 867     QemuOpts *opts;
 868
 869     if (!net_host_check_device(device)) {
 870         monitor_printf(mon, "invalid host network device %s\n", device);
 871         return;
 872     }
 873
 874     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
 875     if (!opts) {
 876         return;
 877     }
 878
 879     qemu_opt_set(opts, "type", device);
 880
 881     net_client_init(opts, 0, &local_err);
 882     if (error_is_set(&local_err)) {
 883         qerror_report_err(local_err);
 884         error_free(local_err);
 885         monitor_printf(mon, "adding host network device %s failed\n", device);
 886     }
 887 }
 888
 889 void net_host_device_remove(Monitor *mon, const QDict *qdict)
 890 {
 891     NetClientState *nc;
 892     int vlan_id = qdict_get_int(qdict, "vlan_id");
 893     const char *device = qdict_get_str(qdict, "device");
 894
 895     nc = net_hub_find_client_by_name(vlan_id, device);
 896     if (!nc) {
 897         return;
 898     }
 899     if (!net_host_check_device(nc->model)) {
 900         monitor_printf(mon, "invalid host network device %s\n", device);
 901         return;
 902     }
 903     qemu_del_net_client(nc);
 904 }
 905
 906 void netdev_add(QemuOpts *opts, Error **errp)
 907 {
 908     net_client_init(opts, 1, errp);
 909 }
 910
 911 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
 912 {
 913     Error *local_err = NULL;
 914     QemuOptsList *opts_list;
 915     QemuOpts *opts;
 916
 917     opts_list = qemu_find_opts_err("netdev", &local_err);
 918     if (error_is_set(&local_err)) {
 919         goto exit_err;
 920     }
 921
 922     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
 923     if (error_is_set(&local_err)) {
 924         goto exit_err;
 925     }
 926
 927     netdev_add(opts, &local_err);
 928     if (error_is_set(&local_err)) {
 929         qemu_opts_del(opts);
 930         goto exit_err;
 931     }
 932
 933     return 0;
 934
 935 exit_err:
 936     qerror_report_err(local_err);
 937     error_free(local_err);
 938     return -1;
 939 }
 940
 941 void qmp_netdev_del(const char *id, Error **errp)
 942 {
 943     NetClientState *nc;
 944     QemuOpts *opts;
 945
 946     nc = qemu_find_netdev(id);
 947     if (!nc) {
 948         error_set(errp, QERR_DEVICE_NOT_FOUND, id);
 949         return;
 950     }
 951
 952     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
 953     if (!opts) {
 954         error_setg(errp, "Device '%s' is not a netdev", id);
 955         return;
 956     }
 957
 958     qemu_del_net_client(nc);
 959     qemu_opts_del(opts);
 960 }
 961
 962 void print_net_client(Monitor *mon, NetClientState *nc)
 963 {
 964     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
 965                    nc->queue_index,
 966                    NetClientOptionsKind_lookup[nc->info->type],
 967                    nc->info_str);
 968 }
 969
 970 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
 971                                       Error **errp)
 972 {
 973     NetClientState *nc;
 974     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
 975
 976     QTAILQ_FOREACH(nc, &net_clients, next) {
 977         RxFilterInfoList *entry;
 978         RxFilterInfo *info;
 979
 980         if (has_name && strcmp(nc->name, name) != 0) {
 981             continue;
 982         }
 983
 984         /* only query rx-filter information of NIC */
 985         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
 986             if (has_name) {
 987                 error_setg(errp, "net client(%s) isn't a NIC", name);
 988                 break;
 989             }
 990             continue;
 991         }
 992
 993         if (nc->info->query_rx_filter) {
 994             info = nc->info->query_rx_filter(nc);
 995             entry = g_malloc0(sizeof(*entry));
 996             entry->value = info;
 997
 998             if (!filter_list) {
 999                 filter_list = entry;
1000             } else {
1001                 last_entry->next = entry;
1002             }
1003             last_entry = entry;
1004         } else if (has_name) {
1005             error_setg(errp, "net client(%s) doesn't support"
1006                        " rx-filter querying", name);
1007             break;
1008         }
1009     }
1010
1011     if (filter_list == NULL && !error_is_set(errp) && has_name) {
1012         error_setg(errp, "invalid net client name: %s", name);
1013     }
1014
1015     return filter_list;
1016 }
1017
1018 void do_info_network(Monitor *mon, const QDict *qdict)
1019 {
1020     NetClientState *nc, *peer;
1021     NetClientOptionsKind type;
1022
1023     net_hub_info(mon);
1024
1025     QTAILQ_FOREACH(nc, &net_clients, next) {
1026         peer = nc->peer;
1027         type = nc->info->type;
1028
1029         /* Skip if already printed in hub info */
1030         if (net_hub_id_for_client(nc, NULL) == 0) {
1031             continue;
1032         }
1033
1034         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1035             print_net_client(mon, nc);
1036         } /* else it's a netdev connected to a NIC, printed with the NIC */
1037         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1038             monitor_printf(mon, " \\ ");
1039             print_net_client(mon, peer);
1040         }
1041     }
1042 }
1043
1044 void qmp_set_link(const char *name, bool up, Error **errp)
1045 {
1046     NetClientState *ncs[MAX_QUEUE_NUM];
1047     NetClientState *nc;
1048     int queues, i;
1049
1050     queues = qemu_find_net_clients_except(name, ncs,
1051                                           NET_CLIENT_OPTIONS_KIND_MAX,
1052                                           MAX_QUEUE_NUM);
1053
1054     if (queues == 0) {
1055         error_set(errp, QERR_DEVICE_NOT_FOUND, name);
1056         return;
1057     }
1058     nc = ncs[0];
1059
1060     for (i = 0; i < queues; i++) {
1061         ncs[i]->link_down = !up;
1062     }
1063
1064     if (nc->info->link_status_changed) {
1065         nc->info->link_status_changed(nc);
1066     }
1067
1068     /* Notify peer. Don't update peer link status: this makes it possible to
1069      * disconnect from host network without notifying the guest.
1070      * FIXME: is disconnected link status change operation useful?
1071      *
1072      * Current behaviour is compatible with qemu vlans where there could be
1073      * multiple clients that can still communicate with each other in
1074      * disconnected mode. For now maintain this compatibility. */
1075     if (nc->peer && nc->peer->info->link_status_changed) {
1076         nc->peer->info->link_status_changed(nc->peer);
1077     }
1078 }
1079
1080 void net_cleanup(void)
1081 {
1082     NetClientState *nc;
1083
1084     /* We may del multiple entries during qemu_del_net_client(),
1085      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1086      */
1087     while (!QTAILQ_EMPTY(&net_clients)) {
1088         nc = QTAILQ_FIRST(&net_clients);
1089         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1090             qemu_del_nic(qemu_get_nic(nc));
1091         } else {
1092             qemu_del_net_client(nc);
1093         }
1094     }
1095 }
1096
1097 void net_check_clients(void)
1098 {
1099     NetClientState *nc;
1100     int i;
1101
1102     /* Don't warn about the default network setup that you get if
1103      * no command line -net or -netdev options are specified. There
1104      * are two cases that we would otherwise complain about:
1105      * (1) board doesn't support a NIC but the implicit "-net nic"
1106      * requested one
1107      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1108      * sets up a nic that isn't connected to anything.
1109      */
1110     if (default_net) {
1111         return;
1112     }
1113
1114     net_hub_check_clients();
1115
1116     QTAILQ_FOREACH(nc, &net_clients, next) {
1117         if (!nc->peer) {
1118             fprintf(stderr, "Warning: %s %s has no peer\n",
1119                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1120                     "nic" : "netdev", nc->name);
1121         }
1122     }
1123
1124     /* Check that all NICs requested via -net nic actually got created.
1125      * NICs created via -device don't need to be checked here because
1126      * they are always instantiated.
1127      */
1128     for (i = 0; i < MAX_NICS; i++) {
1129         NICInfo *nd = &nd_table[i];
1130         if (nd->used && !nd->instantiated) {
1131             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1132                     "was not created (not supported by this machine?)\n",
1133                     nd->name ? nd->name : "anonymous",
1134                     nd->model ? nd->model : "unspecified");
1135         }
1136     }
1137 }
1138
1139 static int net_init_client(QemuOpts *opts, void *dummy)
1140 {
1141     Error *local_err = NULL;
1142
1143     net_client_init(opts, 0, &local_err);
1144     if (error_is_set(&local_err)) {
1145         qerror_report_err(local_err);
1146         error_free(local_err);
1147         return -1;
1148     }
1149
1150     return 0;
1151 }
1152
1153 static int net_init_netdev(QemuOpts *opts, void *dummy)
1154 {
1155     Error *local_err = NULL;
1156     int ret;
1157
1158     ret = net_client_init(opts, 1, &local_err);
1159     if (error_is_set(&local_err)) {
1160         qerror_report_err(local_err);
1161         error_free(local_err);
1162         return -1;
1163     }
1164
1165     return ret;
1166 }
1167
1168 int net_init_clients(void)
1169 {
1170     QemuOptsList *net = qemu_find_opts("net");
1171
1172     if (default_net) {
1173         /* if no clients, we use a default config */
1174         qemu_opts_set(net, NULL, "type", "nic");
1175 #ifdef CONFIG_SLIRP
1176         qemu_opts_set(net, NULL, "type", "user");
1177 #endif
1178     }
1179
1180     QTAILQ_INIT(&net_clients);
1181
1182     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1183         return -1;
1184
1185     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1186         return -1;
1187     }
1188
1189     return 0;
1190 }
1191
1192 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1193 {
1194 #if defined(CONFIG_SLIRP)
1195     int ret;
1196     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1197         return ret;
1198     }
1199 #endif
1200
1201     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1202         return -1;
1203     }
1204
1205     default_net = 0;
1206     return 0;
1207 }
1208
1209 /* From FreeBSD */
1210 /* XXX: optimize */
1211 unsigned compute_mcast_idx(const uint8_t *ep)
1212 {
1213     uint32_t crc;
1214     int carry, i, j;
1215     uint8_t b;
1216
1217     crc = 0xffffffff;
1218     for (i = 0; i < 6; i++) {
1219         b = *ep++;
1220         for (j = 0; j < 8; j++) {
1221             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1222             crc <<= 1;
1223             b >>= 1;
1224             if (carry) {
1225                 crc = ((crc ^ POLYNOMIAL) | carry);
1226             }
1227         }
1228     }
1229     return crc >> 26;
1230 }
1231
1232 QemuOptsList qemu_netdev_opts = {
1233     .name = "netdev",
1234     .implied_opt_name = "type",
1235     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1236     .desc = {
1237         /*
1238          * no elements => accept any params
1239          * validation will happen later
1240          */
1241         { /* end of list */ }
1242     },
1243 };
1244
1245 QemuOptsList qemu_net_opts = {
1246     .name = "net",
1247     .implied_opt_name = "type",
1248     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1249     .desc = {
1250         /*
1251          * no elements => accept any params
1252          * validation will happen later
1253          */
1254         { /* end of list */ }
1255     },
1256 };