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 }; 1460