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 #include "sysemu/sysemu.h"
  45
  46 /* Net bridge is currently not supported for W32. */
  47 #if !defined(_WIN32)
  48 # define CONFIG_NET_BRIDGE
  49 #endif
  50
  51 static VMChangeStateEntry *net_change_state_entry;
  52 static QTAILQ_HEAD(, NetClientState) net_clients;
  53
  54 const char *host_net_devices[] = {
  55     "tap",
  56     "socket",
  57     "dump",
  58 #ifdef CONFIG_NET_BRIDGE
  59     "bridge",
  60 #endif
  61 #ifdef CONFIG_SLIRP
  62     "user",
  63 #endif
  64 #ifdef CONFIG_VDE
  65     "vde",
  66 #endif
  67     "vhost-user",
  68     NULL,
  69 };
  70
  71 int default_net = 1;
  72
  73 /***********************************************************/
  74 /* network device redirectors */
  75
  76 #if defined(DEBUG_NET)
  77 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  78 {
  79     int len, i, j, c;
  80
  81     for(i=0;i<size;i+=16) {
  82         len = size - i;
  83         if (len > 16)
  84             len = 16;
  85         fprintf(f, "%08x ", i);
  86         for(j=0;j<16;j++) {
  87             if (j < len)
  88                 fprintf(f, " %02x", buf[i+j]);
  89             else
  90                 fprintf(f, "   ");
  91         }
  92         fprintf(f, " ");
  93         for(j=0;j<len;j++) {
  94             c = buf[i+j];
  95             if (c < ' ' || c > '~')
  96                 c = '.';
  97             fprintf(f, "%c", c);
  98         }
  99         fprintf(f, "\n");
 100     }
 101 }
 102 #endif
 103
 104 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
 105 {
 106     const char *p, *p1;
 107     int len;
 108     p = *pp;
 109     p1 = strchr(p, sep);
 110     if (!p1)
 111         return -1;
 112     len = p1 - p;
 113     p1++;
 114     if (buf_size > 0) {
 115         if (len > buf_size - 1)
 116             len = buf_size - 1;
 117         memcpy(buf, p, len);
 118         buf[len] = '\0';
 119     }
 120     *pp = p1;
 121     return 0;
 122 }
 123
 124 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 125 {
 126     char buf[512];
 127     struct hostent *he;
 128     const char *p, *r;
 129     int port;
 130
 131     p = str;
 132     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 133         return -1;
 134     saddr->sin_family = AF_INET;
 135     if (buf[0] == '\0') {
 136         saddr->sin_addr.s_addr = 0;
 137     } else {
 138         if (qemu_isdigit(buf[0])) {
 139             if (!inet_aton(buf, &saddr->sin_addr))
 140                 return -1;
 141         } else {
 142             if ((he = gethostbyname(buf)) == NULL)
 143                 return - 1;
 144             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 145         }
 146     }
 147     port = strtol(p, (char **)&r, 0);
 148     if (r == p)
 149         return -1;
 150     saddr->sin_port = htons(port);
 151     return 0;
 152 }
 153
 154 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
 155 {
 156     return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
 157                            macaddr[0], macaddr[1], macaddr[2],
 158                            macaddr[3], macaddr[4], macaddr[5]);
 159 }
 160
 161 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
 162 {
 163     snprintf(nc->info_str, sizeof(nc->info_str),
 164              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 165              nc->model,
 166              macaddr[0], macaddr[1], macaddr[2],
 167              macaddr[3], macaddr[4], macaddr[5]);
 168 }
 169
 170 static int mac_table[256] = {0};
 171
 172 static void qemu_macaddr_set_used(MACAddr *macaddr)
 173 {
 174     int index;
 175
 176     for (index = 0x56; index < 0xFF; index++) {
 177         if (macaddr->a[5] == index) {
 178             mac_table[index]++;
 179         }
 180     }
 181 }
 182
 183 static void qemu_macaddr_set_free(MACAddr *macaddr)
 184 {
 185     int index;
 186     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 187
 188     if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 189         return;
 190     }
 191     for (index = 0x56; index < 0xFF; index++) {
 192         if (macaddr->a[5] == index) {
 193             mac_table[index]--;
 194         }
 195     }
 196 }
 197
 198 static int qemu_macaddr_get_free(void)
 199 {
 200     int index;
 201
 202     for (index = 0x56; index < 0xFF; index++) {
 203         if (mac_table[index] == 0) {
 204             return index;
 205         }
 206     }
 207
 208     return -1;
 209 }
 210
 211 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 212 {
 213     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 214     static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
 215
 216     if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
 217         if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
 218             return;
 219         } else {
 220             qemu_macaddr_set_used(macaddr);
 221             return;
 222         }
 223     }
 224
 225     macaddr->a[0] = 0x52;
 226     macaddr->a[1] = 0x54;
 227     macaddr->a[2] = 0x00;
 228     macaddr->a[3] = 0x12;
 229     macaddr->a[4] = 0x34;
 230     macaddr->a[5] = qemu_macaddr_get_free();
 231     qemu_macaddr_set_used(macaddr);
 232 }
 233
 234 /**
 235  * Generate a name for net client
 236  *
 237  * Only net clients created with the legacy -net option and NICs need this.
 238  */
 239 static char *assign_name(NetClientState *nc1, const char *model)
 240 {
 241     NetClientState *nc;
 242     int id = 0;
 243
 244     QTAILQ_FOREACH(nc, &net_clients, next) {
 245         if (nc == nc1) {
 246             continue;
 247         }
 248         if (strcmp(nc->model, model) == 0) {
 249             id++;
 250         }
 251     }
 252
 253     return g_strdup_printf("%s.%d", model, id);
 254 }
 255
 256 static void qemu_net_client_destructor(NetClientState *nc)
 257 {
 258     g_free(nc);
 259 }
 260
 261 static void qemu_net_client_setup(NetClientState *nc,
 262                                   NetClientInfo *info,
 263                                   NetClientState *peer,
 264                                   const char *model,
 265                                   const char *name,
 266                                   NetClientDestructor *destructor)
 267 {
 268     nc->info = info;
 269     nc->model = g_strdup(model);
 270     if (name) {
 271         nc->name = g_strdup(name);
 272     } else {
 273         nc->name = assign_name(nc, model);
 274     }
 275
 276     if (peer) {
 277         assert(!peer->peer);
 278         nc->peer = peer;
 279         peer->peer = nc;
 280     }
 281     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
 282
 283     nc->incoming_queue = qemu_new_net_queue(nc);
 284     nc->destructor = destructor;
 285 }
 286
 287 NetClientState *qemu_new_net_client(NetClientInfo *info,
 288                                     NetClientState *peer,
 289                                     const char *model,
 290                                     const char *name)
 291 {
 292     NetClientState *nc;
 293
 294     assert(info->size >= sizeof(NetClientState));
 295
 296     nc = g_malloc0(info->size);
 297     qemu_net_client_setup(nc, info, peer, model, name,
 298                           qemu_net_client_destructor);
 299
 300     return nc;
 301 }
 302
 303 NICState *qemu_new_nic(NetClientInfo *info,
 304                        NICConf *conf,
 305                        const char *model,
 306                        const char *name,
 307                        void *opaque)
 308 {
 309     NetClientState **peers = conf->peers.ncs;
 310     NICState *nic;
 311     int i, queues = MAX(1, conf->peers.queues);
 312
 313     assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
 314     assert(info->size >= sizeof(NICState));
 315
 316     nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
 317     nic->ncs = (void *)nic + info->size;
 318     nic->conf = conf;
 319     nic->opaque = opaque;
 320
 321     for (i = 0; i < queues; i++) {
 322         qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
 323                               NULL);
 324         nic->ncs[i].queue_index = i;
 325     }
 326
 327     return nic;
 328 }
 329
 330 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
 331 {
 332     return nic->ncs + queue_index;
 333 }
 334
 335 NetClientState *qemu_get_queue(NICState *nic)
 336 {
 337     return qemu_get_subqueue(nic, 0);
 338 }
 339
 340 NICState *qemu_get_nic(NetClientState *nc)
 341 {
 342     NetClientState *nc0 = nc - nc->queue_index;
 343
 344     return (NICState *)((void *)nc0 - nc->info->size);
 345 }
 346
 347 void *qemu_get_nic_opaque(NetClientState *nc)
 348 {
 349     NICState *nic = qemu_get_nic(nc);
 350
 351     return nic->opaque;
 352 }
 353
 354 static void qemu_cleanup_net_client(NetClientState *nc)
 355 {
 356     QTAILQ_REMOVE(&net_clients, nc, next);
 357
 358     if (nc->info->cleanup) {
 359         nc->info->cleanup(nc);
 360     }
 361 }
 362
 363 static void qemu_free_net_client(NetClientState *nc)
 364 {
 365     if (nc->incoming_queue) {
 366         qemu_del_net_queue(nc->incoming_queue);
 367     }
 368     if (nc->peer) {
 369         nc->peer->peer = NULL;
 370     }
 371     g_free(nc->name);
 372     g_free(nc->model);
 373     if (nc->destructor) {
 374         nc->destructor(nc);
 375     }
 376 }
 377
 378 void qemu_del_net_client(NetClientState *nc)
 379 {
 380     NetClientState *ncs[MAX_QUEUE_NUM];
 381     int queues, i;
 382
 383     assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
 384
 385     /* If the NetClientState belongs to a multiqueue backend, we will change all
 386      * other NetClientStates also.
 387      */
 388     queues = qemu_find_net_clients_except(nc->name, ncs,
 389                                           NET_CLIENT_OPTIONS_KIND_NIC,
 390                                           MAX_QUEUE_NUM);
 391     assert(queues != 0);
 392
 393     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 394     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 395         NICState *nic = qemu_get_nic(nc->peer);
 396         if (nic->peer_deleted) {
 397             return;
 398         }
 399         nic->peer_deleted = true;
 400
 401         for (i = 0; i < queues; i++) {
 402             ncs[i]->peer->link_down = true;
 403         }
 404
 405         if (nc->peer->info->link_status_changed) {
 406             nc->peer->info->link_status_changed(nc->peer);
 407         }
 408
 409         for (i = 0; i < queues; i++) {
 410             qemu_cleanup_net_client(ncs[i]);
 411         }
 412
 413         return;
 414     }
 415
 416     for (i = 0; i < queues; i++) {
 417         qemu_cleanup_net_client(ncs[i]);
 418         qemu_free_net_client(ncs[i]);
 419     }
 420 }
 421
 422 void qemu_del_nic(NICState *nic)
 423 {
 424     int i, queues = MAX(nic->conf->peers.queues, 1);
 425
 426     qemu_macaddr_set_free(&nic->conf->macaddr);
 427
 428     /* If this is a peer NIC and peer has already been deleted, free it now. */
 429     if (nic->peer_deleted) {
 430         for (i = 0; i < queues; i++) {
 431             qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
 432         }
 433     }
 434
 435     for (i = queues - 1; i >= 0; i--) {
 436         NetClientState *nc = qemu_get_subqueue(nic, i);
 437
 438         qemu_cleanup_net_client(nc);
 439         qemu_free_net_client(nc);
 440     }
 441
 442     g_free(nic);
 443 }
 444
 445 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 446 {
 447     NetClientState *nc;
 448
 449     QTAILQ_FOREACH(nc, &net_clients, next) {
 450         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
 451             if (nc->queue_index == 0) {
 452                 func(qemu_get_nic(nc), opaque);
 453             }
 454         }
 455     }
 456 }
 457
 458 bool qemu_has_ufo(NetClientState *nc)
 459 {
 460     if (!nc || !nc->info->has_ufo) {
 461         return false;
 462     }
 463
 464     return nc->info->has_ufo(nc);
 465 }
 466
 467 bool qemu_has_vnet_hdr(NetClientState *nc)
 468 {
 469     if (!nc || !nc->info->has_vnet_hdr) {
 470         return false;
 471     }
 472
 473     return nc->info->has_vnet_hdr(nc);
 474 }
 475
 476 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
 477 {
 478     if (!nc || !nc->info->has_vnet_hdr_len) {
 479         return false;
 480     }
 481
 482     return nc->info->has_vnet_hdr_len(nc, len);
 483 }
 484
 485 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
 486 {
 487     if (!nc || !nc->info->using_vnet_hdr) {
 488         return;
 489     }
 490
 491     nc->info->using_vnet_hdr(nc, enable);
 492 }
 493
 494 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 495                           int ecn, int ufo)
 496 {
 497     if (!nc || !nc->info->set_offload) {
 498         return;
 499     }
 500
 501     nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
 502 }
 503
 504 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 505 {
 506     if (!nc || !nc->info->set_vnet_hdr_len) {
 507         return;
 508     }
 509
 510     nc->info->set_vnet_hdr_len(nc, len);
 511 }
 512
 513 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 514 {
 515     if (!nc || !nc->info->set_vnet_le) {
 516         return -ENOSYS;
 517     }
 518
 519     return nc->info->set_vnet_le(nc, is_le);
 520 }
 521
 522 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 523 {
 524     if (!nc || !nc->info->set_vnet_be) {
 525         return -ENOSYS;
 526     }
 527
 528     return nc->info->set_vnet_be(nc, is_be);
 529 }
 530
 531 int qemu_can_send_packet(NetClientState *sender)
 532 {
 533     int vm_running = runstate_is_running();
 534
 535     if (!vm_running) {
 536         return 0;
 537     }
 538
 539     if (!sender->peer) {
 540         return 1;
 541     }
 542
 543     if (sender->peer->receive_disabled) {
 544         return 0;
 545     } else if (sender->peer->info->can_receive &&
 546                !sender->peer->info->can_receive(sender->peer)) {
 547         return 0;
 548     }
 549     return 1;
 550 }
 551
 552 ssize_t qemu_deliver_packet(NetClientState *sender,
 553                             unsigned flags,
 554                             const uint8_t *data,
 555                             size_t size,
 556                             void *opaque)
 557 {
 558     NetClientState *nc = opaque;
 559     ssize_t ret;
 560
 561     if (nc->link_down) {
 562         return size;
 563     }
 564
 565     if (nc->receive_disabled) {
 566         return 0;
 567     }
 568
 569     if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
 570         ret = nc->info->receive_raw(nc, data, size);
 571     } else {
 572         ret = nc->info->receive(nc, data, size);
 573     }
 574
 575     if (ret == 0) {
 576         nc->receive_disabled = 1;
 577     }
 578
 579     return ret;
 580 }
 581
 582 void qemu_purge_queued_packets(NetClientState *nc)
 583 {
 584     if (!nc->peer) {
 585         return;
 586     }
 587
 588     qemu_net_queue_purge(nc->peer->incoming_queue, nc);
 589 }
 590
 591 static
 592 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
 593 {
 594     nc->receive_disabled = 0;
 595
 596     if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 597         if (net_hub_flush(nc->peer)) {
 598             qemu_notify_event();
 599         }
 600     }
 601     if (qemu_net_queue_flush(nc->incoming_queue)) {
 602         /* We emptied the queue successfully, signal to the IO thread to repoll
 603          * the file descriptor (for tap, for example).
 604          */
 605         qemu_notify_event();
 606     } else if (purge) {
 607         /* Unable to empty the queue, purge remaining packets */
 608         qemu_net_queue_purge(nc->incoming_queue, nc);
 609     }
 610 }
 611
 612 void qemu_flush_queued_packets(NetClientState *nc)
 613 {
 614     qemu_flush_or_purge_queued_packets(nc, false);
 615 }
 616
 617 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
 618                                                  unsigned flags,
 619                                                  const uint8_t *buf, int size,
 620                                                  NetPacketSent *sent_cb)
 621 {
 622     NetQueue *queue;
 623
 624 #ifdef DEBUG_NET
 625     printf("qemu_send_packet_async:\n");
 626     hex_dump(stdout, buf, size);
 627 #endif
 628
 629     if (sender->link_down || !sender->peer) {
 630         return size;
 631     }
 632
 633     queue = sender->peer->incoming_queue;
 634
 635     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 636 }
 637
 638 ssize_t qemu_send_packet_async(NetClientState *sender,
 639                                const uint8_t *buf, int size,
 640                                NetPacketSent *sent_cb)
 641 {
 642     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 643                                              buf, size, sent_cb);
 644 }
 645
 646 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
 647 {
 648     qemu_send_packet_async(nc, buf, size, NULL);
 649 }
 650
 651 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
 652 {
 653     return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
 654                                              buf, size, NULL);
 655 }
 656
 657 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
 658                                int iovcnt)
 659 {
 660     uint8_t buffer[NET_BUFSIZE];
 661     size_t offset;
 662
 663     offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
 664
 665     return nc->info->receive(nc, buffer, offset);
 666 }
 667
 668 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
 669                                 unsigned flags,
 670                                 const struct iovec *iov,
 671                                 int iovcnt,
 672                                 void *opaque)
 673 {
 674     NetClientState *nc = opaque;
 675     int ret;
 676
 677     if (nc->link_down) {
 678         return iov_size(iov, iovcnt);
 679     }
 680
 681     if (nc->receive_disabled) {
 682         return 0;
 683     }
 684
 685     if (nc->info->receive_iov) {
 686         ret = nc->info->receive_iov(nc, iov, iovcnt);
 687     } else {
 688         ret = nc_sendv_compat(nc, iov, iovcnt);
 689     }
 690
 691     if (ret == 0) {
 692         nc->receive_disabled = 1;
 693     }
 694
 695     return ret;
 696 }
 697
 698 ssize_t qemu_sendv_packet_async(NetClientState *sender,
 699                                 const struct iovec *iov, int iovcnt,
 700                                 NetPacketSent *sent_cb)
 701 {
 702     NetQueue *queue;
 703
 704     if (sender->link_down || !sender->peer) {
 705         return iov_size(iov, iovcnt);
 706     }
 707
 708     queue = sender->peer->incoming_queue;
 709
 710     return qemu_net_queue_send_iov(queue, sender,
 711                                    QEMU_NET_PACKET_FLAG_NONE,
 712                                    iov, iovcnt, sent_cb);
 713 }
 714
 715 ssize_t
 716 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
 717 {
 718     return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
 719 }
 720
 721 NetClientState *qemu_find_netdev(const char *id)
 722 {
 723     NetClientState *nc;
 724
 725     QTAILQ_FOREACH(nc, &net_clients, next) {
 726         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
 727             continue;
 728         if (!strcmp(nc->name, id)) {
 729             return nc;
 730         }
 731     }
 732
 733     return NULL;
 734 }
 735
 736 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
 737                                  NetClientOptionsKind type, int max)
 738 {
 739     NetClientState *nc;
 740     int ret = 0;
 741
 742     QTAILQ_FOREACH(nc, &net_clients, next) {
 743         if (nc->info->type == type) {
 744             continue;
 745         }
 746         if (!id || !strcmp(nc->name, id)) {
 747             if (ret < max) {
 748                 ncs[ret] = nc;
 749             }
 750             ret++;
 751         }
 752     }
 753
 754     return ret;
 755 }
 756
 757 static int nic_get_free_idx(void)
 758 {
 759     int index;
 760
 761     for (index = 0; index < MAX_NICS; index++)
 762         if (!nd_table[index].used)
 763             return index;
 764     return -1;
 765 }
 766
 767 int qemu_show_nic_models(const char *arg, const char *const *models)
 768 {
 769     int i;
 770
 771     if (!arg || !is_help_option(arg)) {
 772         return 0;
 773     }
 774
 775     fprintf(stderr, "qemu: Supported NIC models: ");
 776     for (i = 0 ; models[i]; i++)
 777         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 778     return 1;
 779 }
 780
 781 void qemu_check_nic_model(NICInfo *nd, const char *model)
 782 {
 783     const char *models[2];
 784
 785     models[0] = model;
 786     models[1] = NULL;
 787
 788     if (qemu_show_nic_models(nd->model, models))
 789         exit(0);
 790     if (qemu_find_nic_model(nd, models, model) < 0)
 791         exit(1);
 792 }
 793
 794 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 795                         const char *default_model)
 796 {
 797     int i;
 798
 799     if (!nd->model)
 800         nd->model = g_strdup(default_model);
 801
 802     for (i = 0 ; models[i]; i++) {
 803         if (strcmp(nd->model, models[i]) == 0)
 804             return i;
 805     }
 806
 807     error_report("Unsupported NIC model: %s", nd->model);
 808     return -1;
 809 }
 810
 811 static int net_init_nic(const NetClientOptions *opts, const char *name,
 812                         NetClientState *peer, Error **errp)
 813 {
 814     int idx;
 815     NICInfo *nd;
 816     const NetLegacyNicOptions *nic;
 817
 818     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
 819     nic = opts->nic;
 820
 821     idx = nic_get_free_idx();
 822     if (idx == -1 || nb_nics >= MAX_NICS) {
 823         error_setg(errp, "too many NICs");
 824         return -1;
 825     }
 826
 827     nd = &nd_table[idx];
 828
 829     memset(nd, 0, sizeof(*nd));
 830
 831     if (nic->has_netdev) {
 832         nd->netdev = qemu_find_netdev(nic->netdev);
 833         if (!nd->netdev) {
 834             error_setg(errp, "netdev '%s' not found", nic->netdev);
 835             return -1;
 836         }
 837     } else {
 838         assert(peer);
 839         nd->netdev = peer;
 840     }
 841     nd->name = g_strdup(name);
 842     if (nic->has_model) {
 843         nd->model = g_strdup(nic->model);
 844     }
 845     if (nic->has_addr) {
 846         nd->devaddr = g_strdup(nic->addr);
 847     }
 848
 849     if (nic->has_macaddr &&
 850         net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
 851         error_setg(errp, "invalid syntax for ethernet address");
 852         return -1;
 853     }
 854     if (nic->has_macaddr &&
 855         is_multicast_ether_addr(nd->macaddr.a)) {
 856         error_setg(errp,
 857                    "NIC cannot have multicast MAC address (odd 1st byte)");
 858         return -1;
 859     }
 860     qemu_macaddr_default_if_unset(&nd->macaddr);
 861
 862     if (nic->has_vectors) {
 863         if (nic->vectors > 0x7ffffff) {
 864             error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
 865             return -1;
 866         }
 867         nd->nvectors = nic->vectors;
 868     } else {
 869         nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
 870     }
 871
 872     nd->used = 1;
 873     nb_nics++;
 874
 875     return idx;
 876 }
 877
 878
 879 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 880     const NetClientOptions *opts,
 881     const char *name,
 882     NetClientState *peer, Error **errp) = {
 883         [NET_CLIENT_OPTIONS_KIND_NIC]       = net_init_nic,
 884 #ifdef CONFIG_SLIRP
 885         [NET_CLIENT_OPTIONS_KIND_USER]      = net_init_slirp,
 886 #endif
 887         [NET_CLIENT_OPTIONS_KIND_TAP]       = net_init_tap,
 888         [NET_CLIENT_OPTIONS_KIND_SOCKET]    = net_init_socket,
 889 #ifdef CONFIG_VDE
 890         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 891 #endif
 892 #ifdef CONFIG_NETMAP
 893         [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
 894 #endif
 895         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 896 #ifdef CONFIG_NET_BRIDGE
 897         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
 898 #endif
 899         [NET_CLIENT_OPTIONS_KIND_HUBPORT]   = net_init_hubport,
 900 #ifdef CONFIG_VHOST_NET_USED
 901         [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
 902 #endif
 903 #ifdef CONFIG_L2TPV3
 904         [NET_CLIENT_OPTIONS_KIND_L2TPV3]    = net_init_l2tpv3,
 905 #endif
 906 };
 907
 908
 909 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 910 {
 911     union {
 912         const Netdev    *netdev;
 913         const NetLegacy *net;
 914     } u;
 915     const NetClientOptions *opts;
 916     const char *name;
 917
 918     if (is_netdev) {
 919         u.netdev = object;
 920         opts = u.netdev->opts;
 921         name = u.netdev->id;
 922
 923         switch (opts->kind) {
 924 #ifdef CONFIG_SLIRP
 925         case NET_CLIENT_OPTIONS_KIND_USER:
 926 #endif
 927         case NET_CLIENT_OPTIONS_KIND_TAP:
 928         case NET_CLIENT_OPTIONS_KIND_SOCKET:
 929 #ifdef CONFIG_VDE
 930         case NET_CLIENT_OPTIONS_KIND_VDE:
 931 #endif
 932 #ifdef CONFIG_NETMAP
 933         case NET_CLIENT_OPTIONS_KIND_NETMAP:
 934 #endif
 935 #ifdef CONFIG_NET_BRIDGE
 936         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 937 #endif
 938         case NET_CLIENT_OPTIONS_KIND_HUBPORT:
 939 #ifdef CONFIG_VHOST_NET_USED
 940         case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
 941 #endif
 942 #ifdef CONFIG_L2TPV3
 943         case NET_CLIENT_OPTIONS_KIND_L2TPV3:
 944 #endif
 945             break;
 946
 947         default:
 948             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 949                        "a netdev backend type");
 950             return -1;
 951         }
 952     } else {
 953         u.net = object;
 954         opts = u.net->opts;
 955         if (opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
 956             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 957                        "a net type");
 958             return -1;
 959         }
 960         /* missing optional values have been initialized to "all bits zero" */
 961         name = u.net->has_id ? u.net->id : u.net->name;
 962     }
 963
 964     if (net_client_init_fun[opts->kind]) {
 965         NetClientState *peer = NULL;
 966
 967         /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
 968          * parameter. */
 969         if (!is_netdev &&
 970             (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
 971              !opts->nic->has_netdev)) {
 972             peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
 973         }
 974
 975         if (net_client_init_fun[opts->kind](opts, name, peer, errp) < 0) {
 976             /* FIXME drop when all init functions store an Error */
 977             if (errp && !*errp) {
 978                 error_setg(errp, QERR_DEVICE_INIT_FAILED,
 979                            NetClientOptionsKind_lookup[opts->kind]);
 980             }
 981             return -1;
 982         }
 983     }
 984     return 0;
 985 }
 986
 987
 988 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
 989 {
 990     if (is_netdev) {
 991         visit_type_Netdev(v, (Netdev **)object, NULL, errp);
 992     } else {
 993         visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
 994     }
 995 }
 996
 997
 998 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
 999 {
1000     void *object = NULL;
1001     Error *err = NULL;
1002     int ret = -1;
1003
1004     {
1005         OptsVisitor *ov = opts_visitor_new(opts);
1006
1007         net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
1008         opts_visitor_cleanup(ov);
1009     }
1010
1011     if (!err) {
1012         ret = net_client_init1(object, is_netdev, &err);
1013     }
1014
1015     if (object) {
1016         QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
1017
1018         net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
1019         qapi_dealloc_visitor_cleanup(dv);
1020     }
1021
1022     error_propagate(errp, err);
1023     return ret;
1024 }
1025
1026
1027 static int net_host_check_device(const char *device)
1028 {
1029     int i;
1030     for (i = 0; host_net_devices[i]; i++) {
1031         if (!strncmp(host_net_devices[i], device,
1032                      strlen(host_net_devices[i]))) {
1033             return 1;
1034         }
1035     }
1036
1037     return 0;
1038 }
1039
1040 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1041 {
1042     const char *device = qdict_get_str(qdict, "device");
1043     const char *opts_str = qdict_get_try_str(qdict, "opts");
1044     Error *local_err = NULL;
1045     QemuOpts *opts;
1046
1047     if (!net_host_check_device(device)) {
1048         monitor_printf(mon, "invalid host network device %s\n", device);
1049         return;
1050     }
1051
1052     opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1053                                    opts_str ? opts_str : "", false);
1054     if (!opts) {
1055         return;
1056     }
1057
1058     qemu_opt_set(opts, "type", device, &error_abort);
1059
1060     net_client_init(opts, 0, &local_err);
1061     if (local_err) {
1062         error_report_err(local_err);
1063         monitor_printf(mon, "adding host network device %s failed\n", device);
1064     }
1065 }
1066
1067 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1068 {
1069     NetClientState *nc;
1070     int vlan_id = qdict_get_int(qdict, "vlan_id");
1071     const char *device = qdict_get_str(qdict, "device");
1072
1073     nc = net_hub_find_client_by_name(vlan_id, device);
1074     if (!nc) {
1075         error_report("Host network device '%s' on hub '%d' not found",
1076                      device, vlan_id);
1077         return;
1078     }
1079     if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1080         error_report("invalid host network device '%s'", device);
1081         return;
1082     }
1083
1084     qemu_del_net_client(nc->peer);
1085     qemu_del_net_client(nc);
1086 }
1087
1088 void netdev_add(QemuOpts *opts, Error **errp)
1089 {
1090     net_client_init(opts, 1, errp);
1091 }
1092
1093 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
1094 {
1095     Error *local_err = NULL;
1096     QemuOptsList *opts_list;
1097     QemuOpts *opts;
1098
1099     opts_list = qemu_find_opts_err("netdev", &local_err);
1100     if (local_err) {
1101         goto exit_err;
1102     }
1103
1104     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1105     if (local_err) {
1106         goto exit_err;
1107     }
1108
1109     netdev_add(opts, &local_err);
1110     if (local_err) {
1111         qemu_opts_del(opts);
1112         goto exit_err;
1113     }
1114
1115     return 0;
1116
1117 exit_err:
1118     qerror_report_err(local_err);
1119     error_free(local_err);
1120     return -1;
1121 }
1122
1123 void qmp_netdev_del(const char *id, Error **errp)
1124 {
1125     NetClientState *nc;
1126     QemuOpts *opts;
1127
1128     nc = qemu_find_netdev(id);
1129     if (!nc) {
1130         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1131                   "Device '%s' not found", id);
1132         return;
1133     }
1134
1135     opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1136     if (!opts) {
1137         error_setg(errp, "Device '%s' is not a netdev", id);
1138         return;
1139     }
1140
1141     qemu_del_net_client(nc);
1142     qemu_opts_del(opts);
1143 }
1144
1145 void print_net_client(Monitor *mon, NetClientState *nc)
1146 {
1147     monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1148                    nc->queue_index,
1149                    NetClientOptionsKind_lookup[nc->info->type],
1150                    nc->info_str);
1151 }
1152
1153 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1154                                       Error **errp)
1155 {
1156     NetClientState *nc;
1157     RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1158
1159     QTAILQ_FOREACH(nc, &net_clients, next) {
1160         RxFilterInfoList *entry;
1161         RxFilterInfo *info;
1162
1163         if (has_name && strcmp(nc->name, name) != 0) {
1164             continue;
1165         }
1166
1167         /* only query rx-filter information of NIC */
1168         if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1169             if (has_name) {
1170                 error_setg(errp, "net client(%s) isn't a NIC", name);
1171                 return NULL;
1172             }
1173             continue;
1174         }
1175
1176         if (nc->info->query_rx_filter) {
1177             info = nc->info->query_rx_filter(nc);
1178             entry = g_malloc0(sizeof(*entry));
1179             entry->value = info;
1180
1181             if (!filter_list) {
1182                 filter_list = entry;
1183             } else {
1184                 last_entry->next = entry;
1185             }
1186             last_entry = entry;
1187         } else if (has_name) {
1188             error_setg(errp, "net client(%s) doesn't support"
1189                        " rx-filter querying", name);
1190             return NULL;
1191         }
1192
1193         if (has_name) {
1194             break;
1195         }
1196     }
1197
1198     if (filter_list == NULL && has_name) {
1199         error_setg(errp, "invalid net client name: %s", name);
1200     }
1201
1202     return filter_list;
1203 }
1204
1205 void hmp_info_network(Monitor *mon, const QDict *qdict)
1206 {
1207     NetClientState *nc, *peer;
1208     NetClientOptionsKind type;
1209
1210     net_hub_info(mon);
1211
1212     QTAILQ_FOREACH(nc, &net_clients, next) {
1213         peer = nc->peer;
1214         type = nc->info->type;
1215
1216         /* Skip if already printed in hub info */
1217         if (net_hub_id_for_client(nc, NULL) == 0) {
1218             continue;
1219         }
1220
1221         if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1222             print_net_client(mon, nc);
1223         } /* else it's a netdev connected to a NIC, printed with the NIC */
1224         if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1225             monitor_printf(mon, " \\ ");
1226             print_net_client(mon, peer);
1227         }
1228     }
1229 }
1230
1231 void qmp_set_link(const char *name, bool up, Error **errp)
1232 {
1233     NetClientState *ncs[MAX_QUEUE_NUM];
1234     NetClientState *nc;
1235     int queues, i;
1236
1237     queues = qemu_find_net_clients_except(name, ncs,
1238                                           NET_CLIENT_OPTIONS_KIND_MAX,
1239                                           MAX_QUEUE_NUM);
1240
1241     if (queues == 0) {
1242         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1243                   "Device '%s' not found", name);
1244         return;
1245     }
1246     nc = ncs[0];
1247
1248     for (i = 0; i < queues; i++) {
1249         ncs[i]->link_down = !up;
1250     }
1251
1252     if (nc->info->link_status_changed) {
1253         nc->info->link_status_changed(nc);
1254     }
1255
1256     if (nc->peer) {
1257         /* Change peer link only if the peer is NIC and then notify peer.
1258          * If the peer is a HUBPORT or a backend, we do not change the
1259          * link status.
1260          *
1261          * This behavior is compatible with qemu vlans where there could be
1262          * multiple clients that can still communicate with each other in
1263          * disconnected mode. For now maintain this compatibility.
1264          */
1265         if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1266             for (i = 0; i < queues; i++) {
1267                 ncs[i]->peer->link_down = !up;
1268             }
1269         }
1270         if (nc->peer->info->link_status_changed) {
1271             nc->peer->info->link_status_changed(nc->peer);
1272         }
1273     }
1274 }
1275
1276 static void net_vm_change_state_handler(void *opaque, int running,
1277                                         RunState state)
1278 {
1279     /* Complete all queued packets, to guarantee we don't modify
1280      * state later when VM is not running.
1281      */
1282     if (!running) {
1283         NetClientState *nc;
1284         NetClientState *tmp;
1285
1286         QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1287             qemu_flush_or_purge_queued_packets(nc, true);
1288         }
1289     }
1290 }
1291
1292 void net_cleanup(void)
1293 {
1294     NetClientState *nc;
1295
1296     /* We may del multiple entries during qemu_del_net_client(),
1297      * so QTAILQ_FOREACH_SAFE() is also not safe here.
1298      */
1299     while (!QTAILQ_EMPTY(&net_clients)) {
1300         nc = QTAILQ_FIRST(&net_clients);
1301         if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1302             qemu_del_nic(qemu_get_nic(nc));
1303         } else {
1304             qemu_del_net_client(nc);
1305         }
1306     }
1307
1308     qemu_del_vm_change_state_handler(net_change_state_entry);
1309 }
1310
1311 void net_check_clients(void)
1312 {
1313     NetClientState *nc;
1314     int i;
1315
1316     /* Don't warn about the default network setup that you get if
1317      * no command line -net or -netdev options are specified. There
1318      * are two cases that we would otherwise complain about:
1319      * (1) board doesn't support a NIC but the implicit "-net nic"
1320      * requested one
1321      * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1322      * sets up a nic that isn't connected to anything.
1323      */
1324     if (default_net) {
1325         return;
1326     }
1327
1328     net_hub_check_clients();
1329
1330     QTAILQ_FOREACH(nc, &net_clients, next) {
1331         if (!nc->peer) {
1332             fprintf(stderr, "Warning: %s %s has no peer\n",
1333                     nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1334                     "nic" : "netdev", nc->name);
1335         }
1336     }
1337
1338     /* Check that all NICs requested via -net nic actually got created.
1339      * NICs created via -device don't need to be checked here because
1340      * they are always instantiated.
1341      */
1342     for (i = 0; i < MAX_NICS; i++) {
1343         NICInfo *nd = &nd_table[i];
1344         if (nd->used && !nd->instantiated) {
1345             fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1346                     "was not created (not supported by this machine?)\n",
1347                     nd->name ? nd->name : "anonymous",
1348                     nd->model ? nd->model : "unspecified");
1349         }
1350     }
1351 }
1352
1353 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1354 {
1355     Error *local_err = NULL;
1356
1357     net_client_init(opts, 0, &local_err);
1358     if (local_err) {
1359         error_report_err(local_err);
1360         return -1;
1361     }
1362
1363     return 0;
1364 }
1365
1366 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1367 {
1368     Error *local_err = NULL;
1369     int ret;
1370
1371     ret = net_client_init(opts, 1, &local_err);
1372     if (local_err) {
1373         error_report_err(local_err);
1374         return -1;
1375     }
1376
1377     return ret;
1378 }
1379
1380 int net_init_clients(void)
1381 {
1382     QemuOptsList *net = qemu_find_opts("net");
1383
1384     if (default_net) {
1385         /* if no clients, we use a default config */
1386         qemu_opts_set(net, NULL, "type", "nic", &error_abort);
1387 #ifdef CONFIG_SLIRP
1388         qemu_opts_set(net, NULL, "type", "user", &error_abort);
1389 #endif
1390     }
1391
1392     net_change_state_entry =
1393         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1394
1395     QTAILQ_INIT(&net_clients);
1396
1397     if (qemu_opts_foreach(qemu_find_opts("netdev"),
1398                           net_init_netdev, NULL, NULL)) {
1399         return -1;
1400     }
1401
1402     if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1403         return -1;
1404     }
1405
1406     return 0;
1407 }
1408
1409 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1410 {
1411 #if defined(CONFIG_SLIRP)
1412     int ret;
1413     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1414         return ret;
1415     }
1416 #endif
1417
1418     if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1419         return -1;
1420     }
1421
1422     default_net = 0;
1423     return 0;
1424 }
1425
1426 /* From FreeBSD */
1427 /* XXX: optimize */
1428 unsigned compute_mcast_idx(const uint8_t *ep)
1429 {
1430     uint32_t crc;
1431     int carry, i, j;
1432     uint8_t b;
1433
1434     crc = 0xffffffff;
1435     for (i = 0; i < 6; i++) {
1436         b = *ep++;
1437         for (j = 0; j < 8; j++) {
1438             carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1439             crc <<= 1;
1440             b >>= 1;
1441             if (carry) {
1442                 crc = ((crc ^ POLYNOMIAL) | carry);
1443             }
1444         }
1445     }
1446     return crc >> 26;
1447 }
1448
1449 QemuOptsList qemu_netdev_opts = {
1450     .name = "netdev",
1451     .implied_opt_name = "type",
1452     .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1453     .desc = {
1454         /*
1455          * no elements => accept any params
1456          * validation will happen later
1457          */
1458         { /* end of list */ }
1459     },
1460 };
1461
1462 QemuOptsList qemu_net_opts = {
1463     .name = "net",
1464     .implied_opt_name = "type",
1465     .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1466     .desc = {
1467         /*
1468          * no elements => accept any params
1469          * validation will happen later
1470          */
1471         { /* end of list */ }
1472     },
1473 };