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 "qapi/qmp/qerror.h"
  36 #include "qemu/error-report.h"
  37 #include "qemu/sockets.h"
  38 #include "qemu/config-file.h"
  39 #include "qmp-commands.h"
  40 #include "hw/qdev.h"
  41 #include "qemu/iov.h"
  42 #include "qemu/main-loop.h"
  43 #include "qapi-visit.h"
  44 #include "qapi/opts-visitor.h"
  45 #include "qapi/dealloc-visitor.h"
  46 #include "sysemu/sysemu.h"
  47
  48 /* Net bridge is currently not supported for W32. */
  49 #if !defined(_WIN32)
  50 # define CONFIG_NET_BRIDGE
  51 #endif
  52
  53 static VMChangeStateEntry *net_change_state_entry;
  54 static QTAILQ_HEAD(, NetClientState) net_clients;
  55
  56 const char *host_net_devices[] = {
  57     "tap",
  58     "socket",
  59     "dump",
  60 #ifdef CONFIG_NET_BRIDGE
  61     "bridge",
  62 #endif
  63 #ifdef CONFIG_NETMAP
  64     "netmap",
  65 #endif
  66 #ifdef CONFIG_SLIRP
  67     "user",
  68 #endif
  69 #ifdef CONFIG_VDE
  70     "vde",
  71 #endif
  72     "vhost-user",
  73     NULL,
  74 };
  75
  76 int default_net = 1;
  77
  78 /***********************************************************/
  79 /* network device redirectors */
  80
  81 #if defined(DEBUG_NET)
  82 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  83 {
  84     int len, i, j, c;
  85
  86     for(i=0;i<size;i+=16) {
  87         len = size - i;
  88         if (len > 16)
  89             len = 16;
  90         fprintf(f, "%08x ", i);
  91         for(j=0;j<16;j++) {
  92             if (j < len)
  93                 fprintf(f, " %02x", buf[i+j]);
  94             else
  95                 fprintf(f, "   ");
  96         }
  97         fprintf(f, " ");
  98         for(j=0;j<len;j++) {
  99             c = buf[i+j];
 100             if (c < ' ' || c > '~')
 101                 c = '.';
 102             fprintf(f, "%c", c);
 103         }
 104         fprintf(f, "\n");
 105     }
 106 }
 107 #endif
 108
 109 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
 110 {
 111     const char *p, *p1;
 112     int len;
 113     p = *pp;
 114     p1 = strchr(p, sep);
 115     if (!p1)
 116         return -1;
 117     len = p1 - p;
 118     p1++;
 119     if (buf_size > 0) {
 120         if (len > buf_size - 1)
 121             len = buf_size - 1;
 122         memcpy(buf, p, len);
 123         buf[len] = '\0';
 124     }
 125     *pp = p1;
 126     return 0;
 127 }
 128
 129 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 130 {
 131     char buf[512];
 132     struct hostent *he;
 133     const char *p, *r;
 134     int port;
 135
 136     p = str;
 137     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 138         return -1;
 139     saddr->sin_family = AF_INET;
 140     if (buf[0] == '\0') {
 141         saddr->sin_addr.s_addr = 0;
 142     } else {
 143         if (qemu_isdigit(buf[0])) {
 144             if (!inet_aton(buf, &saddr->sin_addr))
 145                 return -1;
 146         } else {
 147             if ((he = gethostbyname(buf)) == NULL)
 148                 return - 1;
 149             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 150         }
 151     }
 152     port = strtol(p, (char **)&r, 0);
 153     if (r == p)
 154         return -1;
 155     saddr->sin_port = htons(port);
 156     return 0;
 157 }
 158
 159 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 160 {
 161     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 162                            macaddr[0], macaddr[1], macaddr[2],
 163                            macaddr[3], macaddr[4], macaddr[5]);
 164 }
 165
 166 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 167 {
 168     snprintf(nc->info_str, sizeof(nc->info_str),
 169              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 170              nc->model,
 171              macaddr[0], macaddr[1], macaddr[2],
 172              macaddr[3], macaddr[4], macaddr[5]);
 173 }
 174
 175 static int mac_table[256] = {0};
 176
 177 static void qemu_macaddr_set_used(MACAddr *macaddr)
 178 {
 179     int index;
 180
 181     for (index = 0x56; index < 0xFF; index++) {
 182         if (macaddr->a[5] == index) {
 183             mac_table[index]++;
 184         }
 185     }
 186 }
 187
 188 static void qemu_macaddr_set_free(MACAddr *macaddr)
 189 {
 190     int index;
 191     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 192
 193     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 194         return;
 195     }
 196     for (index = 0x56; index < 0xFF; index++) {
 197         if (macaddr->a[5] == index) {
 198             mac_table[index]--;
 199         }
 200     }
 201 }
 202
 203 static int qemu_macaddr_get_free(void)
 204 {
 205     int index;
 206
 207     for (index = 0x56; index < 0xFF; index++) {
 208         if (mac_table[index] == 0) {
 209             return index;
 210         }
 211     }
 212
 213     return -1;
 214 }
 215
 216 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 217 {
 218     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 219     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 220
 221     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 222         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 223             return;
 224         } else {
 225             qemu_macaddr_set_used(macaddr);
 226             return;
 227         }
 228     }
 229
 230     macaddr->a[0] = 0x52;
 231     macaddr->a[1] = 0x54;
 232     macaddr->a[2] = 0x00;
 233     macaddr->a[3] = 0x12;
 234     macaddr->a[4] = 0x34;
 235     macaddr->a[5] = qemu_macaddr_get_free();
 236     qemu_macaddr_set_used(macaddr);
 237 }
 238
 239 /**
 240  * Generate a name for net client
 241  *
 242  * Only net clients created with the legacy -net option and NICs need this.
 243  */
 244 static char *assign_name(NetClientState *nc1, const char *model)
 245 {
 246     NetClientState *nc;
 247     int id = 0;
 248
 249     QTAILQ_FOREACH(nc, &net_clients, next) {
 250         if (nc == nc1) {
 251             continue;
 252         }
 253         if (strcmp(nc->model, model) == 0) {
 254             id++;
 255         }
 256     }
 257
 258     return g_strdup_printf("%s.%d", model, id);
 259 }
 260
 261 static void qemu_net_client_destructor(NetClientState *nc)
 262 {
 263     g_free(nc);
 264 }
 265
 266 static void qemu_net_client_setup(NetClientState *nc,
 267                                   NetClientInfo *info,
 268                                   NetClientState *peer,
 269                                   const char *model,
 270                                   const char *name,
 271                                   NetClientDestructor *destructor)
 272 {
 273     nc->info = info;
 274     nc->model = g_strdup(model);
 275     if (name) {
 276         nc->name = g_strdup(name);
 277     } else {
 278         nc->name = assign_name(nc, model);
 279     }
 280
 281     if (peer) {
 282         assert(!peer->peer);
 283         nc->peer = peer;
 284         peer->peer = nc;
 285     }
 286     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 287
 288     nc->incoming_queue = qemu_new_net_queue(nc);
 289     nc->destructor = destructor;
 290 }
 291
 292 NetClientState *qemu_new_net_client(NetClientInfo *info,
 293                                     NetClientState *peer,
 294                                     const char *model,
 295                                     const char *name)
 296 {
 297     NetClientState *nc;
 298
 299     assert(info->size >= sizeof(NetClientState));
 300
 301     nc = g_malloc0(info->size);
 302     qemu_net_client_setup(nc, info, peer, model, name,
 303                           qemu_net_client_destructor);
 304
 305     return nc;
 306 }
 307
 308 NICState *qemu_new_nic(NetClientInfo *info,
 309                        NICConf *conf,
 310                        const char *model,
 311                        const char *name,
 312                        void *opaque)
 313 {
 314     NetClientState **peers = conf->peers.ncs;
 315     NICState *nic;
 316     int i, queues = MAX(1, conf->peers.queues);
 317
 318     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 319     assert(info->size >= sizeof(NICState));
 320
 321     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 322     nic->ncs = (void *)nic + info->size;
 323     nic->conf = conf;
 324     nic->opaque = opaque;
 325
 326     for (i = 0; i < queues; i++) {
 327         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 328                               NULL);
 329         nic->ncs[i].queue_index = i;
 330     }
 331
 332     return nic;
 333 }
 334
 335 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 336 {
 337     return nic->ncs + queue_index;
 338 }
 339
 340 NetClientState *qemu_get_queue(NICState *nic)
 341 {
 342     return qemu_get_subqueue(nic, 0);
 343 }
 344
 345 NICState *qemu_get_nic(NetClientState *nc)
 346 {
 347     NetClientState *nc0 = nc - nc->queue_index;
 348
 349     return (NICState *)((void *)nc0 - nc->info->size);
 350 }
 351
 352 void *qemu_get_nic_opaque(NetClientState *nc)
 353 {
 354     NICState *nic = qemu_get_nic(nc);
 355
 356     return nic->opaque;
 357 }
 358
 359 static void qemu_cleanup_net_client(NetClientState *nc)
 360 {
 361     QTAILQ_REMOVE(&net_clients, nc, next);
 362
 363     if (nc->info->cleanup) {
 364         nc->info->cleanup(nc);
 365     }
 366 }
 367
 368 static void qemu_free_net_client(NetClientState *nc)
 369 {
 370     if (nc->incoming_queue) {
 371         qemu_del_net_queue(nc->incoming_queue);
 372     }
 373     if (nc->peer) {
 374         nc->peer->peer = NULL;
 375     }
 376     g_free(nc->name);
 377     g_free(nc->model);
 378     if (nc->destructor) {
 379         nc->destructor(nc);
 380     }
 381 }
 382
 383 void qemu_del_net_client(NetClientState *nc)
 384 {
 385     NetClientState *ncs[MAX_QUEUE_NUM];
 386     int queues, i;
 387
 388     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 389
 390     /* If the NetClientState belongs to a multiqueue backend, we will change all
 391      * other NetClientStates also.
 392      */
 393     queues = qemu_find_net_clients_except(nc->name, ncs,
 394                                           NET_CLIENT_OPTIONS_KIND_NIC,
 395                                           MAX_QUEUE_NUM);
 396     assert(queues != 0);
 397
 398     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 399     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 400         NICState *nic = qemu_get_nic(nc->peer);
 401         if (nic->peer_deleted) {
 402             return;
 403         }
 404         nic->peer_deleted = true;
 405
 406         for (i = 0; i < queues; i++) {
 407             ncs[i]->peer->link_down = true;
 408         }
 409
 410         if (nc->peer->info->link_status_changed) {
 411             nc->peer->info->link_status_changed(nc->peer);
 412         }
 413
 414         for (i = 0; i < queues; i++) {
 415             qemu_cleanup_net_client(ncs[i]);
 416         }
 417
 418         return;
 419     }
 420
 421     for (i = 0; i < queues; i++) {
 422         qemu_cleanup_net_client(ncs[i]);
 423         qemu_free_net_client(ncs[i]);
 424     }
 425 }
 426
 427 void qemu_del_nic(NICState *nic)
 428 {
 429     int i, queues = MAX(nic->conf->peers.queues, 1);
 430
 431     qemu_macaddr_set_free(&nic->conf->macaddr);
 432
 433     /* If this is a peer NIC and peer has already been deleted, free it now. */
 434     if (nic->peer_deleted) {
 435         for (i = 0; i < queues; i++) {
 436             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 437         }
 438     }
 439
 440     for (i = queues - 1; i >= 0; i--) {
 441         NetClientState *nc = qemu_get_subqueue(nic, i);
 442
 443         qemu_cleanup_net_client(nc);
 444         qemu_free_net_client(nc);
 445     }
 446
 447     g_free(nic);
 448 }
 449
 450 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 451 {
 452     NetClientState *nc;
 453
 454     QTAILQ_FOREACH(nc, &net_clients, next) {
 455         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 456             if (nc->queue_index == 0) {
 457                 func(qemu_get_nic(nc), opaque);
 458             }
 459         }
 460     }
 461 }
 462
 463 bool qemu_has_ufo(NetClientState *nc)
 464 {
 465     if (!nc || !nc->info->has_ufo) {
 466         return false;
 467     }
 468
 469     return nc->info->has_ufo(nc);
 470 }
 471
 472 bool qemu_has_vnet_hdr(NetClientState *nc)
 473 {
 474     if (!nc || !nc->info->has_vnet_hdr) {
 475         return false;
 476     }
 477
 478     return nc->info->has_vnet_hdr(nc);
 479 }
 480
 481 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 482 {
 483     if (!nc || !nc->info->has_vnet_hdr_len) {
 484         return false;
 485     }
 486
 487     return nc->info->has_vnet_hdr_len(nc, len);
 488 }
 489
 490 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 491 {
 492     if (!nc || !nc->info->using_vnet_hdr) {
 493         return;
 494     }
 495
 496     nc->info->using_vnet_hdr(nc, enable);
 497 }
 498
 499 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 500                           int ecn, int ufo)
 501 {
 502     if (!nc || !nc->info->set_offload) {
 503         return;
 504     }
 505
 506     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 507 }
 508
 509 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 510 {
 511     if (!nc || !nc->info->set_vnet_hdr_len) {
 512         return;
 513     }
 514
 515     nc->info->set_vnet_hdr_len(nc, len);
 516 }
 517
 518 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 519 {
 520     if (!nc || !nc->info->set_vnet_le) {
 521         return -ENOSYS;
 522     }
 523
 524     return nc->info->set_vnet_le(nc, is_le);
 525 }
 526
 527 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 528 {
 529     if (!nc || !nc->info->set_vnet_be) {
 530         return -ENOSYS;
 531     }
 532
 533     return nc->info->set_vnet_be(nc, is_be);
 534 }
 535
 536 int qemu_can_send_packet(NetClientState *sender)
 537 {
 538     int vm_running = runstate_is_running();
 539
 540     if (!vm_running) {
 541         return 0;
 542     }
 543
 544     if (!sender->peer) {
 545         return 1;
 546     }
 547
 548     if (sender->peer->receive_disabled) {
 549         return 0;
 550     } else if (sender->peer->info->can_receive &&
 551                !sender->peer->info->can_receive(sender->peer)) {
 552         return 0;
 553     }
 554     return 1;
 555 }
 556
 557 ssize_t qemu_deliver_packet(NetClientState *sender,
 558                             unsigned flags,
 559                             const uint8_t *data,
 560                             size_t size,
 561                             void *opaque)
 562 {
 563     NetClientState *nc = opaque;
 564     ssize_t ret;
 565
 566     if (nc->link_down) {
 567         return size;
 568     }
 569
 570     if (nc->receive_disabled) {
 571         return 0;
 572     }
 573
 574     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 575         ret = nc->info->receive_raw(nc, data, size);
 576     } else {
 577         ret = nc->info->receive(nc, data, size);
 578     }
 579
 580     if (ret == 0) {
 581         nc->receive_disabled = 1;
 582     }
 583
 584     return ret;
 585 }
 586
 587 void qemu_purge_queued_packets(NetClientState *nc)
 588 {
 589     if (!nc->peer) {
 590         return;
 591     }
 592
 593     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 594 }
 595
 596 static
 597 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 598 {
 599     nc->receive_disabled = 0;
 600
 601     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 602         if (net_hub_flush(nc->peer)) {
 603             qemu_notify_event();
 604         }
 605     }
 606     if (qemu_net_queue_flush(nc->incoming_queue)) {
 607         /* We emptied the queue successfully, signal to the IO thread to repoll
 608          * the file descriptor (for tap, for example).
 609          */
 610         qemu_notify_event();
 611     } else if (purge) {
 612         /* Unable to empty the queue, purge remaining packets */
 613         qemu_net_queue_purge(nc->incoming_queue, nc);
 614     }
 615 }
 616
 617 void qemu_flush_queued_packets(NetClientState *nc)
 618 {
 619     qemu_flush_or_purge_queued_packets(nc, false);
 620 }
 621
 622 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 623                                                  unsigned flags,
 624                                                  const uint8_t *buf, int size,
 625                                                  NetPacketSent *sent_cb)
 626 {
 627     NetQueue *queue;
 628
 629 #ifdef DEBUG_NET
 630     printf("qemu_send_packet_async:\n");
 631     hex_dump(stdout, buf, size);
 632 #endif
 633
 634     if (sender->link_down || !sender->peer) {
 635         return size;
 636     }
 637
 638     queue = sender->peer->incoming_queue;
 639
 640     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 641 }
 642
 643 ssize_t qemu_send_packet_async(NetClientState *sender,
 644                                const uint8_t *buf, int size,
 645                                NetPacketSent *sent_cb)
 646 {
 647     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 648                                              buf, size, sent_cb);
 649 }
 650
 651 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 652 {
 653     qemu_send_packet_async(nc, buf, size, NULL);
 654 }
 655
 656 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 657 {
 658     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 659                                              buf, size, NULL);
 660 }
 661
 662 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 663                                int iovcnt)
 664 {
 665     uint8_t buffer[NET_BUFSIZE];
 666     size_t offset;
 667
 668     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 669
 670     return nc->info->receive(nc, buffer, offset);
 671 }
 672
 673 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 674                                 unsigned flags,
 675                                 const struct iovec *iov,
 676                                 int iovcnt,
 677                                 void *opaque)
 678 {
 679     NetClientState *nc = opaque;
 680     int ret;
 681
 682     if (nc->link_down) {
 683         return iov_size(iov, iovcnt);
 684     }
 685
 686     if (nc->receive_disabled) {
 687         return 0;
 688     }
 689
 690     if (nc->info->receive_iov) {
 691         ret = nc->info->receive_iov(nc, iov, iovcnt);
 692     } else {
 693         ret = nc_sendv_compat(nc, iov, iovcnt);
 694     }
 695
 696     if (ret == 0) {
 697         nc->receive_disabled = 1;
 698     }
 699
 700     return ret;
 701 }
 702
 703 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 704                                 const struct iovec *iov, int iovcnt,
 705                                 NetPacketSent *sent_cb)
 706 {
 707     NetQueue *queue;
 708
 709     if (sender->link_down || !sender->peer) {
 710         return iov_size(iov, iovcnt);
 711     }
 712
 713     queue = sender->peer->incoming_queue;
 714
 715     return qemu_net_queue_send_iov(queue, sender,
 716                                    QEMU_NET_PACKET_FLAG_NONE,
 717                                    iov, iovcnt, sent_cb);
 718 }
 719
 720 ssize_t
 721 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 722 {
 723     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 724 }
 725
 726 NetClientState *qemu_find_netdev(const char *id)
 727 {
 728     NetClientState *nc;
 729
 730     QTAILQ_FOREACH(nc, &net_clients, next) {
 731         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 732             continue;
 733         if (!strcmp(nc->name, id)) {
 734             return nc;
 735         }
 736     }
 737
 738     return NULL;
 739 }
 740
 741 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 742                                  NetClientOptionsKind type, int max)
 743 {
 744     NetClientState *nc;
 745     int ret = 0;
 746
 747     QTAILQ_FOREACH(nc, &net_clients, next) {
 748         if (nc->info->type == type) {
 749             continue;
 750         }
 751         if (!id || !strcmp(nc->name, id)) {
 752             if (ret < max) {
 753                 ncs[ret] = nc;
 754             }
 755             ret++;
 756         }
 757     }
 758
 759     return ret;
 760 }
 761
 762 static int nic_get_free_idx(void)
 763 {
 764     int index;
 765
 766     for (index = 0; index < MAX_NICS; index++)
 767         if (!nd_table[index].used)
 768             return index;
 769     return -1;
 770 }
 771
 772 int qemu_show_nic_models(const char *arg, const char *const *models)
 773 {
 774     int i;
 775
 776     if (!arg || !is_help_option(arg)) {
 777         return 0;
 778     }
 779
 780     fprintf(stderr, "qemu: Supported NIC models: ");
 781     for (i = 0 ; models[i]; i++)
 782         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 783     return 1;
 784 }
 785
 786 void qemu_check_nic_model(NICInfo *nd, const char *model)
 787 {
 788     const char *models[2];
 789
 790     models[0] = model;
 791     models[1] = NULL;
 792
 793     if (qemu_show_nic_models(nd->model, models))
 794         exit(0);
 795     if (qemu_find_nic_model(nd, models, model) < 0)
 796         exit(1);
 797 }
 798
 799 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 800                         const char *default_model)
 801 {
 802     int i;
 803
 804     if (!nd->model)
 805         nd->model = g_strdup(default_model);
 806
 807     for (i = 0 ; models[i]; i++) {
 808         if (strcmp(nd->model, models[i]) == 0)
 809             return i;
 810     }
 811
 812     error_report("Unsupported NIC model: %s", nd->model);
 813     return -1;
 814 }
 815
 816 static int net_init_nic(const NetClientOptions *opts, const char *name,
 817                         NetClientState *peer, Error **errp)
 818 {
 819     int idx;
 820     NICInfo *nd;
 821     const NetLegacyNicOptions *nic;
 822
 823     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 824     nic = opts->nic;
 825
 826     idx = nic_get_free_idx();
 827     if (idx == -1 || nb_nics >= MAX_NICS) {
 828         error_setg(errp, "too many NICs");
 829         return -1;
 830     }
 831
 832     nd = &nd_table[idx];
 833
 834     memset(nd, 0, sizeof(*nd));
 835
 836     if (nic->has_netdev) {
 837         nd->netdev = qemu_find_netdev(nic->netdev);
 838         if (!nd->netdev) {
 839             error_setg(errp, "netdev '%s' not found", nic->netdev);
 840             return -1;
 841         }
 842     } else {
 843         assert(peer);
 844         nd->netdev = peer;
 845     }
 846     nd->name = g_strdup(name);
 847     if (nic->has_model) {
 848         nd->model = g_strdup(nic->model);
 849     }
 850     if (nic->has_addr) {
 851         nd->devaddr = g_strdup(nic->addr);
 852     }
 853
 854     if (nic->has_macaddr &&
 855         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 856         error_setg(errp, "invalid syntax for ethernet address");
 857         return -1;
 858     }
 859     if (nic->has_macaddr &&
 860         is_multicast_ether_addr(nd->macaddr.a)) {
 861         error_setg(errp,
 862                    "NIC cannot have multicast MAC address (odd 1st byte)");
 863         return -1;
 864     }
 865     qemu_macaddr_default_if_unset(&nd->macaddr);
 866
 867     if (nic->has_vectors) {
 868         if (nic->vectors > 0x7ffffff) {
 869             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 870             return -1;
 871         }
 872         nd->nvectors = nic->vectors;
 873     } else {
 874         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 875     }
 876
 877     nd->used = 1;
 878     nb_nics++;
 879
 880     return idx;
 881 }
 882
 883
 884 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 885     const NetClientOptions *opts,
 886     const char *name,
 887     NetClientState *peer, Error **errp) = {
 888         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 889 #ifdef CONFIG_SLIRP
 890         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 891 #endif
 892         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 893         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 894 #ifdef CONFIG_VDE
 895         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 896 #endif
 897 #ifdef CONFIG_NETMAP
 898         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 899 #endif
 900         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 901 #ifdef CONFIG_NET_BRIDGE
 902         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 903 #endif
 904         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 905 #ifdef CONFIG_VHOST_NET_USED
 906         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 907 #endif
 908 #ifdef CONFIG_L2TPV3
 909         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 910 #endif
 911 };
 912
 913
 914 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 915 {
 916     const NetClientOptions *opts;
 917     const char *name;
 918     NetClientState *peer = NULL;
 919
 920     if (is_netdev) {
 921         const Netdev *netdev = object;
 922         opts = netdev->opts;
 923         name = netdev->id;
 924
 925         if (opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP ||
 926             opts->kind == NET_CLIENT_OPTIONS_KIND_NIC ||
 927             !net_client_init_fun[opts->kind]) {
 928             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 929                        "a netdev backend type");
 930             return -1;
 931         }
 932     } else {
 933         const NetLegacy *net = object;
 934         opts = net->opts;
 935         /* missing optional values have been initialized to "all bits zero" */
 936         name = net->has_id ? net->id : net->name;
 937
 938         if (opts->kind == NET_CLIENT_OPTIONS_KIND_NONE) {
 939             return 0; /* nothing to do */
 940         }
 941         if (opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 942             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 943                        "a net type");
 944             return -1;
 945         }
 946
 947         if (!net_client_init_fun[opts->kind]) {
 948             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 949                        "a net backend type (maybe it is not compiled "
 950                        "into this binary)");
 951             return -1;
 952         }
 953
 954         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
 955         if (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 956             !opts->nic->has_netdev) {
 957             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
 958         }
 959     }
 960
 961     if (net_client_init_fun[opts->kind](opts, name, peer, errp) < 0) {
 962         /* FIXME drop when all init functions store an Error */
 963         if (errp && !*errp) {
 964             error_setg(errp, QERR_DEVICE_INIT_FAILED,
 965                        NetClientOptionsKind_lookup[opts->kind]);
 966         }
 967         return -1;
 968     }
 969     return 0;
 970 }
 971
 972
 973 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 974 {
 975     if (is_netdev) {
 976         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 977     } else {
 978         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 979     }
 980 }
 981
 982
 983 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 984 {
 985     void *object = NULL;
 986     Error *err = NULL;
 987     int ret = -1;
 988
 989     {
 990         OptsVisitor *ov = opts_visitor_new(opts);
 991
 992         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
 993         opts_visitor_cleanup(ov);
 994     }
 995
 996     if (!err) {
 997         ret = net_client_init1(object, is_netdev, &err);
 998     }
 999
1000     if (object) {
1001         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
1002
1003         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
1004         qapi_dealloc_visitor_cleanup(dv);
1005     }
1006
1007     error_propagate(errp, err);
1008     return ret;
1009 }
1010
1011
1012 static int net_host_check_device(const char *device)
1013 {
1014     int i;
1015     for (i = 0; host_net_devices[i]; i++) {
1016         if (!strncmp(host_net_devices[i], device,
1017                      strlen(host_net_devices[i]))) {
1018             return 1;
1019         }
1020     }
1021
1022     return 0;
1023 }
1024
1025 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1026 {
1027     const char *device = qdict_get_str(qdict, "device");
1028     const char *opts_str = qdict_get_try_str(qdict, "opts");
1029     Error *local_err = NULL;
1030     QemuOpts *opts;
1031
1032     if (!net_host_check_device(device)) {
1033         monitor_printf(mon, "invalid host network device %s\n", device);
1034         return;
1035     }
1036
1037     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1038                                    opts_str ? opts_str : "", false);
1039     if (!opts) {
1040         return;
1041     }
1042
1043     qemu_opt_set(opts, "type", device, &error_abort);
1044
1045     net_client_init(opts, 0, &local_err);
1046     if (local_err) {
1047         error_report_err(local_err);
1048         monitor_printf(mon, "adding host network device %s failed\n", device);
1049     }
1050 }
1051
1052 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1053 {
1054     NetClientState *nc;
1055     int vlan_id = qdict_get_int(qdict, "vlan_id");
1056     const char *device = qdict_get_str(qdict, "device");
1057
1058     nc = net_hub_find_client_by_name(vlan_id, device);
1059     if (!nc) {
1060         error_report("Host network device '%s' on hub '%d' not found",
1061                      device, vlan_id);
1062         return;
1063     }
1064     if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1065         error_report("invalid host network device '%s'", device);
1066         return;
1067     }
1068
1069     qemu_del_net_client(nc->peer);
1070     qemu_del_net_client(nc);
1071 }
1072
1073 void netdev_add(QemuOpts *opts, Error **errp)
1074 {
1075     net_client_init(opts, 1, errp);
1076 }
1077
1078 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1079 {
1080     Error *local_err = NULL;
1081     QemuOptsList *opts_list;
1082     QemuOpts *opts;
1083
1084     opts_list = qemu_find_opts_err("netdev", &local_err);
1085     if (local_err) {
1086         goto out;
1087     }
1088
1089     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1090     if (local_err) {
1091         goto out;
1092     }
1093
1094     netdev_add(opts, &local_err);
1095     if (local_err) {
1096         qemu_opts_del(opts);
1097         goto out;
1098     }
1099
1100 out:
1101     error_propagate(errp, local_err);
1102 }
1103
1104 void qmp_netdev_del(const char *id, Error **errp)
1105 {
1106     NetClientState *nc;
1107     QemuOpts *opts;
1108
1109     nc = qemu_find_netdev(id);
1110     if (!nc) {
1111         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1112                   "Device '%s' not found", id);
1113         return;
1114     }
1115
1116     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1117     if (!opts) {
1118         error_setg(errp, "Device '%s' is not a netdev", id);
1119         return;
1120     }
1121
1122     qemu_del_net_client(nc);
1123     qemu_opts_del(opts);
1124 }
1125
1126 void print_net_client(Monitor *mon, NetClientState *nc)
1127 {
1128     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1129                    nc->queue_index,
1130                    NetClientOptionsKind_lookup[nc->info->type],
1131                    nc->info_str);
1132 }
1133
1134 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1135                                       Error **errp)
1136 {
1137     NetClientState *nc;
1138     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1139
1140     QTAILQ_FOREACH(nc, &net_clients, next) {
1141         RxFilterInfoList *entry;
1142         RxFilterInfo *info;
1143
1144         if (has_name && strcmp(nc->name, name) != 0) {
1145             continue;
1146         }
1147
1148         /* only query rx-filter information of NIC */
1149         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1150             if (has_name) {
1151                 error_setg(errp, "net client(%s) isn't a NIC", name);
1152                 return NULL;
1153             }
1154             continue;
1155         }
1156
1157         if (nc->info->query_rx_filter) {
1158             info = nc->info->query_rx_filter(nc);
1159             entry = g_malloc0(sizeof(*entry));
1160             entry->value = info;
1161
1162             if (!filter_list) {
1163                 filter_list = entry;
1164             } else {
1165                 last_entry->next = entry;
1166             }
1167             last_entry = entry;
1168         } else if (has_name) {
1169             error_setg(errp, "net client(%s) doesn't support"
1170                        " rx-filter querying", name);
1171             return NULL;
1172         }
1173
1174         if (has_name) {
1175             break;
1176         }
1177     }
1178
1179     if (filter_list == NULL && has_name) {
1180         error_setg(errp, "invalid net client name: %s", name);
1181     }
1182
1183     return filter_list;
1184 }
1185
1186 void hmp_info_network(Monitor *mon, const QDict *qdict)
1187 {
1188     NetClientState *nc, *peer;
1189     NetClientOptionsKind type;
1190
1191     net_hub_info(mon);
1192
1193     QTAILQ_FOREACH(nc, &net_clients, next) {
1194         peer = nc->peer;
1195         type = nc->info->type;
1196
1197         /* Skip if already printed in hub info */
1198         if (net_hub_id_for_client(nc, NULL) == 0) {
1199             continue;
1200         }
1201
1202         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1203             print_net_client(mon, nc);
1204         } /* else it's a netdev connected to a NIC, printed with the NIC */
1205         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1206             monitor_printf(mon, " \\ ");
1207             print_net_client(mon, peer);
1208         }
1209     }
1210 }
1211
1212 void qmp_set_link(const char *name, bool up, Error **errp)
1213 {
1214     NetClientState *ncs[MAX_QUEUE_NUM];
1215     NetClientState *nc;
1216     int queues, i;
1217
1218     queues = qemu_find_net_clients_except(name, ncs,
1219                                           NET_CLIENT_OPTIONS_KIND_MAX,
1220                                           MAX_QUEUE_NUM);
1221
1222     if (queues == 0) {
1223         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1224                   "Device '%s' not found", name);
1225         return;
1226     }
1227     nc = ncs[0];
1228
1229     for (i = 0; i < queues; i++) {
1230         ncs[i]->link_down = !up;
1231     }
1232
1233     if (nc->info->link_status_changed) {
1234         nc->info->link_status_changed(nc);
1235     }
1236
1237     if (nc->peer) {
1238         /* Change peer link only if the peer is NIC and then notify peer.
1239          * If the peer is a HUBPORT or a backend, we do not change the
1240          * link status.
1241          *
1242          * This behavior is compatible with qemu vlans where there could be
1243          * multiple clients that can still communicate with each other in
1244          * disconnected mode. For now maintain this compatibility.
1245          */
1246         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1247             for (i = 0; i < queues; i++) {
1248                 ncs[i]->peer->link_down = !up;
1249             }
1250         }
1251         if (nc->peer->info->link_status_changed) {
1252             nc->peer->info->link_status_changed(nc->peer);
1253         }
1254     }
1255 }
1256
1257 static void net_vm_change_state_handler(void *opaque, int running,
1258                                         RunState state)
1259 {
1260     NetClientState *nc;
1261     NetClientState *tmp;
1262
1263     QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1264         if (running) {
1265             /* Flush queued packets and wake up backends. */
1266             if (nc->peer && qemu_can_send_packet(nc)) {
1267                 qemu_flush_queued_packets(nc->peer);
1268             }
1269         } else {
1270             /* Complete all queued packets, to guarantee we don't modify
1271              * state later when VM is not running.
1272              */
1273             qemu_flush_or_purge_queued_packets(nc, true);
1274         }
1275     }
1276 }
1277
1278 void net_cleanup(void)
1279 {
1280     NetClientState *nc;
1281
1282     /* We may del multiple entries during qemu_del_net_client(),
1283      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1284      */
1285     while (!QTAILQ_EMPTY(&net_clients)) {
1286         nc = QTAILQ_FIRST(&net_clients);
1287         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1288             qemu_del_nic(qemu_get_nic(nc));
1289         } else {
1290             qemu_del_net_client(nc);
1291         }
1292     }
1293
1294     qemu_del_vm_change_state_handler(net_change_state_entry);
1295 }
1296
1297 void net_check_clients(void)
1298 {
1299     NetClientState *nc;
1300     int i;
1301
1302     /* Don't warn about the default network setup that you get if
1303      * no command line -net or -netdev options are specified. There
1304      * are two cases that we would otherwise complain about:
1305      * (1) board doesn't support a NIC but the implicit "-net nic"
1306      * requested one
1307      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1308      * sets up a nic that isn't connected to anything.
1309      */
1310     if (default_net) {
1311         return;
1312     }
1313
1314     net_hub_check_clients();
1315
1316     QTAILQ_FOREACH(nc, &net_clients, next) {
1317         if (!nc->peer) {
1318             fprintf(stderr, "Warning: %s %s has no peer\n",
1319                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1320                     "nic" : "netdev", nc->name);
1321         }
1322     }
1323
1324     /* Check that all NICs requested via -net nic actually got created.
1325      * NICs created via -device don't need to be checked here because
1326      * they are always instantiated.
1327      */
1328     for (i = 0; i < MAX_NICS; i++) {
1329         NICInfo *nd = &nd_table[i];
1330         if (nd->used && !nd->instantiated) {
1331             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1332                     "was not created (not supported by this machine?)\n",
1333                     nd->name ? nd->name : "anonymous",
1334                     nd->model ? nd->model : "unspecified");
1335         }
1336     }
1337 }
1338
1339 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1340 {
1341     Error *local_err = NULL;
1342
1343     net_client_init(opts, 0, &local_err);
1344     if (local_err) {
1345         error_report_err(local_err);
1346         return -1;
1347     }
1348
1349     return 0;
1350 }
1351
1352 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1353 {
1354     Error *local_err = NULL;
1355     int ret;
1356
1357     ret = net_client_init(opts, 1, &local_err);
1358     if (local_err) {
1359         error_report_err(local_err);
1360         return -1;
1361     }
1362
1363     return ret;
1364 }
1365
1366 int net_init_clients(void)
1367 {
1368     QemuOptsList *net = qemu_find_opts("net");
1369
1370     if (default_net) {
1371         /* if no clients, we use a default config */
1372         qemu_opts_set(net, NULL, "type", "nic", &error_abort);
1373 #ifdef CONFIG_SLIRP
1374         qemu_opts_set(net, NULL, "type", "user", &error_abort);
1375 #endif
1376     }
1377
1378     net_change_state_entry =
1379         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1380
1381     QTAILQ_INIT(&net_clients);
1382
1383     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1384                           net_init_netdev, NULL, NULL)) {
1385         return -1;
1386     }
1387
1388     if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1389         return -1;
1390     }
1391
1392     return 0;
1393 }
1394
1395 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1396 {
1397 #if defined(CONFIG_SLIRP)
1398     int ret;
1399     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1400         return ret;
1401     }
1402 #endif
1403
1404     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1405         return -1;
1406     }
1407
1408     default_net = 0;
1409     return 0;
1410 }
1411
1412 /* From FreeBSD */
1413 /* XXX: optimize */
1414 unsigned compute_mcast_idx(const uint8_t *ep)
1415 {
1416     uint32_t crc;
1417     int carry, i, j;
1418     uint8_t b;
1419
1420     crc = 0xffffffff;
1421     for (i = 0; i < 6; i++) {
1422         b = *ep++;
1423         for (j = 0; j < 8; j++) {
1424             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1425             crc <<= 1;
1426             b >>= 1;
1427             if (carry) {
1428                 crc = ((crc ^ POLYNOMIAL) | carry);
1429             }
1430         }
1431     }
1432     return crc >> 26;
1433 }
1434
1435 QemuOptsList qemu_netdev_opts = {
1436     .name = "netdev",
1437     .implied_opt_name = "type",
1438     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1439     .desc = {
1440         /*
1441          * no elements => accept any params
1442          * validation will happen later
1443          */
1444         { /* end of list */ }
1445     },
1446 };
1447
1448 QemuOptsList qemu_net_opts = {
1449     .name = "net",
1450     .implied_opt_name = "type",
1451     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1452     .desc = {
1453         /*
1454          * no elements => accept any params
1455          * validation will happen later
1456          */
1457         { /* end of list */ }
1458     },
1459 };