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