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 "qemu/osdep.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/help_option.h" 36 #include "qapi/qmp/qerror.h" 37 #include "qemu/error-report.h" 38 #include "qemu/sockets.h" 39 #include "qemu/cutils.h" 40 #include "qemu/config-file.h" 41 #include "qmp-commands.h" 42 #include "hw/qdev.h" 43 #include "qemu/iov.h" 44 #include "qemu/main-loop.h" 45 #include "qapi-visit.h" 46 #include "qapi/opts-visitor.h" 47 #include "sysemu/sysemu.h" 48 #include "net/filter.h" 49 #include "qapi/string-output-visitor.h" 50 51 /* Net bridge is currently not supported for W32. */ 52 #if !defined(_WIN32) 53 # define CONFIG_NET_BRIDGE 54 #endif 55 56 static VMChangeStateEntry *net_change_state_entry; 57 static QTAILQ_HEAD(, NetClientState) net_clients; 58 59 const char *host_net_devices[] = { 60 "tap", 61 "socket", 62 "dump", 63 #ifdef CONFIG_NET_BRIDGE 64 "bridge", 65 #endif 66 #ifdef CONFIG_NETMAP 67 "netmap", 68 #endif 69 #ifdef CONFIG_SLIRP 70 "user", 71 #endif 72 #ifdef CONFIG_VDE 73 "vde", 74 #endif 75 "vhost-user", 76 NULL, 77 }; 78 79 int default_net = 1; 80 81 /***********************************************************/ 82 /* network device redirectors */ 83 84 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 85 { 86 const char *p, *p1; 87 int len; 88 p = *pp; 89 p1 = strchr(p, sep); 90 if (!p1) 91 return -1; 92 len = p1 - p; 93 p1++; 94 if (buf_size > 0) { 95 if (len > buf_size - 1) 96 len = buf_size - 1; 97 memcpy(buf, p, len); 98 buf[len] = '\0'; 99 } 100 *pp = p1; 101 return 0; 102 } 103 104 int parse_host_port(struct sockaddr_in *saddr, const char *str) 105 { 106 char buf[512]; 107 struct hostent *he; 108 const char *p, *r; 109 int port; 110 111 p = str; 112 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) 113 return -1; 114 saddr->sin_family = AF_INET; 115 if (buf[0] == '\0') { 116 saddr->sin_addr.s_addr = 0; 117 } else { 118 if (qemu_isdigit(buf[0])) { 119 if (!inet_aton(buf, &saddr->sin_addr)) 120 return -1; 121 } else { 122 if ((he = gethostbyname(buf)) == NULL) 123 return - 1; 124 saddr->sin_addr = *(struct in_addr *)he->h_addr; 125 } 126 } 127 port = strtol(p, (char **)&r, 0); 128 if (r == p) 129 return -1; 130 saddr->sin_port = htons(port); 131 return 0; 132 } 133 134 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 135 { 136 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 137 macaddr[0], macaddr[1], macaddr[2], 138 macaddr[3], macaddr[4], macaddr[5]); 139 } 140 141 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 142 { 143 snprintf(nc->info_str, sizeof(nc->info_str), 144 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 145 nc->model, 146 macaddr[0], macaddr[1], macaddr[2], 147 macaddr[3], macaddr[4], macaddr[5]); 148 } 149 150 static int mac_table[256] = {0}; 151 152 static void qemu_macaddr_set_used(MACAddr *macaddr) 153 { 154 int index; 155 156 for (index = 0x56; index < 0xFF; index++) { 157 if (macaddr->a[5] == index) { 158 mac_table[index]++; 159 } 160 } 161 } 162 163 static void qemu_macaddr_set_free(MACAddr *macaddr) 164 { 165 int index; 166 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 167 168 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 169 return; 170 } 171 for (index = 0x56; index < 0xFF; index++) { 172 if (macaddr->a[5] == index) { 173 mac_table[index]--; 174 } 175 } 176 } 177 178 static int qemu_macaddr_get_free(void) 179 { 180 int index; 181 182 for (index = 0x56; index < 0xFF; index++) { 183 if (mac_table[index] == 0) { 184 return index; 185 } 186 } 187 188 return -1; 189 } 190 191 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 192 { 193 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 194 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 195 196 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 197 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 198 return; 199 } else { 200 qemu_macaddr_set_used(macaddr); 201 return; 202 } 203 } 204 205 macaddr->a[0] = 0x52; 206 macaddr->a[1] = 0x54; 207 macaddr->a[2] = 0x00; 208 macaddr->a[3] = 0x12; 209 macaddr->a[4] = 0x34; 210 macaddr->a[5] = qemu_macaddr_get_free(); 211 qemu_macaddr_set_used(macaddr); 212 } 213 214 /** 215 * Generate a name for net client 216 * 217 * Only net clients created with the legacy -net option and NICs need this. 218 */ 219 static char *assign_name(NetClientState *nc1, const char *model) 220 { 221 NetClientState *nc; 222 int id = 0; 223 224 QTAILQ_FOREACH(nc, &net_clients, next) { 225 if (nc == nc1) { 226 continue; 227 } 228 if (strcmp(nc->model, model) == 0) { 229 id++; 230 } 231 } 232 233 return g_strdup_printf("%s.%d", model, id); 234 } 235 236 static void qemu_net_client_destructor(NetClientState *nc) 237 { 238 g_free(nc); 239 } 240 241 static void qemu_net_client_setup(NetClientState *nc, 242 NetClientInfo *info, 243 NetClientState *peer, 244 const char *model, 245 const char *name, 246 NetClientDestructor *destructor) 247 { 248 nc->info = info; 249 nc->model = g_strdup(model); 250 if (name) { 251 nc->name = g_strdup(name); 252 } else { 253 nc->name = assign_name(nc, model); 254 } 255 256 if (peer) { 257 assert(!peer->peer); 258 nc->peer = peer; 259 peer->peer = nc; 260 } 261 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 262 263 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 264 nc->destructor = destructor; 265 QTAILQ_INIT(&nc->filters); 266 } 267 268 NetClientState *qemu_new_net_client(NetClientInfo *info, 269 NetClientState *peer, 270 const char *model, 271 const char *name) 272 { 273 NetClientState *nc; 274 275 assert(info->size >= sizeof(NetClientState)); 276 277 nc = g_malloc0(info->size); 278 qemu_net_client_setup(nc, info, peer, model, name, 279 qemu_net_client_destructor); 280 281 return nc; 282 } 283 284 NICState *qemu_new_nic(NetClientInfo *info, 285 NICConf *conf, 286 const char *model, 287 const char *name, 288 void *opaque) 289 { 290 NetClientState **peers = conf->peers.ncs; 291 NICState *nic; 292 int i, queues = MAX(1, conf->peers.queues); 293 294 assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC); 295 assert(info->size >= sizeof(NICState)); 296 297 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 298 nic->ncs = (void *)nic + info->size; 299 nic->conf = conf; 300 nic->opaque = opaque; 301 302 for (i = 0; i < queues; i++) { 303 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 304 NULL); 305 nic->ncs[i].queue_index = i; 306 } 307 308 return nic; 309 } 310 311 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 312 { 313 return nic->ncs + queue_index; 314 } 315 316 NetClientState *qemu_get_queue(NICState *nic) 317 { 318 return qemu_get_subqueue(nic, 0); 319 } 320 321 NICState *qemu_get_nic(NetClientState *nc) 322 { 323 NetClientState *nc0 = nc - nc->queue_index; 324 325 return (NICState *)((void *)nc0 - nc->info->size); 326 } 327 328 void *qemu_get_nic_opaque(NetClientState *nc) 329 { 330 NICState *nic = qemu_get_nic(nc); 331 332 return nic->opaque; 333 } 334 335 static void qemu_cleanup_net_client(NetClientState *nc) 336 { 337 QTAILQ_REMOVE(&net_clients, nc, next); 338 339 if (nc->info->cleanup) { 340 nc->info->cleanup(nc); 341 } 342 } 343 344 static void qemu_free_net_client(NetClientState *nc) 345 { 346 if (nc->incoming_queue) { 347 qemu_del_net_queue(nc->incoming_queue); 348 } 349 if (nc->peer) { 350 nc->peer->peer = NULL; 351 } 352 g_free(nc->name); 353 g_free(nc->model); 354 if (nc->destructor) { 355 nc->destructor(nc); 356 } 357 } 358 359 void qemu_del_net_client(NetClientState *nc) 360 { 361 NetClientState *ncs[MAX_QUEUE_NUM]; 362 int queues, i; 363 NetFilterState *nf, *next; 364 365 assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC); 366 367 /* If the NetClientState belongs to a multiqueue backend, we will change all 368 * other NetClientStates also. 369 */ 370 queues = qemu_find_net_clients_except(nc->name, ncs, 371 NET_CLIENT_OPTIONS_KIND_NIC, 372 MAX_QUEUE_NUM); 373 assert(queues != 0); 374 375 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 376 object_unparent(OBJECT(nf)); 377 } 378 379 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 380 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 381 NICState *nic = qemu_get_nic(nc->peer); 382 if (nic->peer_deleted) { 383 return; 384 } 385 nic->peer_deleted = true; 386 387 for (i = 0; i < queues; i++) { 388 ncs[i]->peer->link_down = true; 389 } 390 391 if (nc->peer->info->link_status_changed) { 392 nc->peer->info->link_status_changed(nc->peer); 393 } 394 395 for (i = 0; i < queues; i++) { 396 qemu_cleanup_net_client(ncs[i]); 397 } 398 399 return; 400 } 401 402 for (i = 0; i < queues; i++) { 403 qemu_cleanup_net_client(ncs[i]); 404 qemu_free_net_client(ncs[i]); 405 } 406 } 407 408 void qemu_del_nic(NICState *nic) 409 { 410 int i, queues = MAX(nic->conf->peers.queues, 1); 411 412 qemu_macaddr_set_free(&nic->conf->macaddr); 413 414 /* If this is a peer NIC and peer has already been deleted, free it now. */ 415 if (nic->peer_deleted) { 416 for (i = 0; i < queues; i++) { 417 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 418 } 419 } 420 421 for (i = queues - 1; i >= 0; i--) { 422 NetClientState *nc = qemu_get_subqueue(nic, i); 423 424 qemu_cleanup_net_client(nc); 425 qemu_free_net_client(nc); 426 } 427 428 g_free(nic); 429 } 430 431 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 432 { 433 NetClientState *nc; 434 435 QTAILQ_FOREACH(nc, &net_clients, next) { 436 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 437 if (nc->queue_index == 0) { 438 func(qemu_get_nic(nc), opaque); 439 } 440 } 441 } 442 } 443 444 bool qemu_has_ufo(NetClientState *nc) 445 { 446 if (!nc || !nc->info->has_ufo) { 447 return false; 448 } 449 450 return nc->info->has_ufo(nc); 451 } 452 453 bool qemu_has_vnet_hdr(NetClientState *nc) 454 { 455 if (!nc || !nc->info->has_vnet_hdr) { 456 return false; 457 } 458 459 return nc->info->has_vnet_hdr(nc); 460 } 461 462 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 463 { 464 if (!nc || !nc->info->has_vnet_hdr_len) { 465 return false; 466 } 467 468 return nc->info->has_vnet_hdr_len(nc, len); 469 } 470 471 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 472 { 473 if (!nc || !nc->info->using_vnet_hdr) { 474 return; 475 } 476 477 nc->info->using_vnet_hdr(nc, enable); 478 } 479 480 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 481 int ecn, int ufo) 482 { 483 if (!nc || !nc->info->set_offload) { 484 return; 485 } 486 487 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 488 } 489 490 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 491 { 492 if (!nc || !nc->info->set_vnet_hdr_len) { 493 return; 494 } 495 496 nc->info->set_vnet_hdr_len(nc, len); 497 } 498 499 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 500 { 501 #ifdef HOST_WORDS_BIGENDIAN 502 if (!nc || !nc->info->set_vnet_le) { 503 return -ENOSYS; 504 } 505 506 return nc->info->set_vnet_le(nc, is_le); 507 #else 508 return 0; 509 #endif 510 } 511 512 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 513 { 514 #ifdef HOST_WORDS_BIGENDIAN 515 return 0; 516 #else 517 if (!nc || !nc->info->set_vnet_be) { 518 return -ENOSYS; 519 } 520 521 return nc->info->set_vnet_be(nc, is_be); 522 #endif 523 } 524 525 int qemu_can_send_packet(NetClientState *sender) 526 { 527 int vm_running = runstate_is_running(); 528 529 if (!vm_running) { 530 return 0; 531 } 532 533 if (!sender->peer) { 534 return 1; 535 } 536 537 if (sender->peer->receive_disabled) { 538 return 0; 539 } else if (sender->peer->info->can_receive && 540 !sender->peer->info->can_receive(sender->peer)) { 541 return 0; 542 } 543 return 1; 544 } 545 546 static ssize_t filter_receive_iov(NetClientState *nc, 547 NetFilterDirection direction, 548 NetClientState *sender, 549 unsigned flags, 550 const struct iovec *iov, 551 int iovcnt, 552 NetPacketSent *sent_cb) 553 { 554 ssize_t ret = 0; 555 NetFilterState *nf = NULL; 556 557 if (direction == NET_FILTER_DIRECTION_TX) { 558 QTAILQ_FOREACH(nf, &nc->filters, next) { 559 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 560 iovcnt, sent_cb); 561 if (ret) { 562 return ret; 563 } 564 } 565 } else { 566 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) { 567 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 568 iovcnt, sent_cb); 569 if (ret) { 570 return ret; 571 } 572 } 573 } 574 575 return ret; 576 } 577 578 static ssize_t filter_receive(NetClientState *nc, 579 NetFilterDirection direction, 580 NetClientState *sender, 581 unsigned flags, 582 const uint8_t *data, 583 size_t size, 584 NetPacketSent *sent_cb) 585 { 586 struct iovec iov = { 587 .iov_base = (void *)data, 588 .iov_len = size 589 }; 590 591 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 592 } 593 594 void qemu_purge_queued_packets(NetClientState *nc) 595 { 596 if (!nc->peer) { 597 return; 598 } 599 600 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 601 } 602 603 static 604 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 605 { 606 nc->receive_disabled = 0; 607 608 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) { 609 if (net_hub_flush(nc->peer)) { 610 qemu_notify_event(); 611 } 612 } 613 if (qemu_net_queue_flush(nc->incoming_queue)) { 614 /* We emptied the queue successfully, signal to the IO thread to repoll 615 * the file descriptor (for tap, for example). 616 */ 617 qemu_notify_event(); 618 } else if (purge) { 619 /* Unable to empty the queue, purge remaining packets */ 620 qemu_net_queue_purge(nc->incoming_queue, nc); 621 } 622 } 623 624 void qemu_flush_queued_packets(NetClientState *nc) 625 { 626 qemu_flush_or_purge_queued_packets(nc, false); 627 } 628 629 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 630 unsigned flags, 631 const uint8_t *buf, int size, 632 NetPacketSent *sent_cb) 633 { 634 NetQueue *queue; 635 int ret; 636 637 #ifdef DEBUG_NET 638 printf("qemu_send_packet_async:\n"); 639 qemu_hexdump((const char *)buf, stdout, "net", size); 640 #endif 641 642 if (sender->link_down || !sender->peer) { 643 return size; 644 } 645 646 /* Let filters handle the packet first */ 647 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 648 sender, flags, buf, size, sent_cb); 649 if (ret) { 650 return ret; 651 } 652 653 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 654 sender, flags, buf, size, sent_cb); 655 if (ret) { 656 return ret; 657 } 658 659 queue = sender->peer->incoming_queue; 660 661 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 662 } 663 664 ssize_t qemu_send_packet_async(NetClientState *sender, 665 const uint8_t *buf, int size, 666 NetPacketSent *sent_cb) 667 { 668 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 669 buf, size, sent_cb); 670 } 671 672 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 673 { 674 qemu_send_packet_async(nc, buf, size, NULL); 675 } 676 677 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 678 { 679 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 680 buf, size, NULL); 681 } 682 683 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 684 int iovcnt, unsigned flags) 685 { 686 uint8_t *buf = NULL; 687 uint8_t *buffer; 688 size_t offset; 689 ssize_t ret; 690 691 if (iovcnt == 1) { 692 buffer = iov[0].iov_base; 693 offset = iov[0].iov_len; 694 } else { 695 buf = g_new(uint8_t, NET_BUFSIZE); 696 buffer = buf; 697 offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE); 698 } 699 700 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 701 ret = nc->info->receive_raw(nc, buffer, offset); 702 } else { 703 ret = nc->info->receive(nc, buffer, offset); 704 } 705 706 g_free(buf); 707 return ret; 708 } 709 710 ssize_t qemu_deliver_packet_iov(NetClientState *sender, 711 unsigned flags, 712 const struct iovec *iov, 713 int iovcnt, 714 void *opaque) 715 { 716 NetClientState *nc = opaque; 717 int ret; 718 719 if (nc->link_down) { 720 return iov_size(iov, iovcnt); 721 } 722 723 if (nc->receive_disabled) { 724 return 0; 725 } 726 727 if (nc->info->receive_iov) { 728 ret = nc->info->receive_iov(nc, iov, iovcnt); 729 } else { 730 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 731 } 732 733 if (ret == 0) { 734 nc->receive_disabled = 1; 735 } 736 737 return ret; 738 } 739 740 ssize_t qemu_sendv_packet_async(NetClientState *sender, 741 const struct iovec *iov, int iovcnt, 742 NetPacketSent *sent_cb) 743 { 744 NetQueue *queue; 745 int ret; 746 747 if (sender->link_down || !sender->peer) { 748 return iov_size(iov, iovcnt); 749 } 750 751 /* Let filters handle the packet first */ 752 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 753 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 754 if (ret) { 755 return ret; 756 } 757 758 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 759 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 760 if (ret) { 761 return ret; 762 } 763 764 queue = sender->peer->incoming_queue; 765 766 return qemu_net_queue_send_iov(queue, sender, 767 QEMU_NET_PACKET_FLAG_NONE, 768 iov, iovcnt, sent_cb); 769 } 770 771 ssize_t 772 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 773 { 774 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 775 } 776 777 NetClientState *qemu_find_netdev(const char *id) 778 { 779 NetClientState *nc; 780 781 QTAILQ_FOREACH(nc, &net_clients, next) { 782 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) 783 continue; 784 if (!strcmp(nc->name, id)) { 785 return nc; 786 } 787 } 788 789 return NULL; 790 } 791 792 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 793 NetClientOptionsKind type, int max) 794 { 795 NetClientState *nc; 796 int ret = 0; 797 798 QTAILQ_FOREACH(nc, &net_clients, next) { 799 if (nc->info->type == type) { 800 continue; 801 } 802 if (!id || !strcmp(nc->name, id)) { 803 if (ret < max) { 804 ncs[ret] = nc; 805 } 806 ret++; 807 } 808 } 809 810 return ret; 811 } 812 813 static int nic_get_free_idx(void) 814 { 815 int index; 816 817 for (index = 0; index < MAX_NICS; index++) 818 if (!nd_table[index].used) 819 return index; 820 return -1; 821 } 822 823 int qemu_show_nic_models(const char *arg, const char *const *models) 824 { 825 int i; 826 827 if (!arg || !is_help_option(arg)) { 828 return 0; 829 } 830 831 fprintf(stderr, "qemu: Supported NIC models: "); 832 for (i = 0 ; models[i]; i++) 833 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); 834 return 1; 835 } 836 837 void qemu_check_nic_model(NICInfo *nd, const char *model) 838 { 839 const char *models[2]; 840 841 models[0] = model; 842 models[1] = NULL; 843 844 if (qemu_show_nic_models(nd->model, models)) 845 exit(0); 846 if (qemu_find_nic_model(nd, models, model) < 0) 847 exit(1); 848 } 849 850 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 851 const char *default_model) 852 { 853 int i; 854 855 if (!nd->model) 856 nd->model = g_strdup(default_model); 857 858 for (i = 0 ; models[i]; i++) { 859 if (strcmp(nd->model, models[i]) == 0) 860 return i; 861 } 862 863 error_report("Unsupported NIC model: %s", nd->model); 864 return -1; 865 } 866 867 static int net_init_nic(const NetClientOptions *opts, const char *name, 868 NetClientState *peer, Error **errp) 869 { 870 int idx; 871 NICInfo *nd; 872 const NetLegacyNicOptions *nic; 873 874 assert(opts->type == NET_CLIENT_OPTIONS_KIND_NIC); 875 nic = opts->u.nic.data; 876 877 idx = nic_get_free_idx(); 878 if (idx == -1 || nb_nics >= MAX_NICS) { 879 error_setg(errp, "too many NICs"); 880 return -1; 881 } 882 883 nd = &nd_table[idx]; 884 885 memset(nd, 0, sizeof(*nd)); 886 887 if (nic->has_netdev) { 888 nd->netdev = qemu_find_netdev(nic->netdev); 889 if (!nd->netdev) { 890 error_setg(errp, "netdev '%s' not found", nic->netdev); 891 return -1; 892 } 893 } else { 894 assert(peer); 895 nd->netdev = peer; 896 } 897 nd->name = g_strdup(name); 898 if (nic->has_model) { 899 nd->model = g_strdup(nic->model); 900 } 901 if (nic->has_addr) { 902 nd->devaddr = g_strdup(nic->addr); 903 } 904 905 if (nic->has_macaddr && 906 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 907 error_setg(errp, "invalid syntax for ethernet address"); 908 return -1; 909 } 910 if (nic->has_macaddr && 911 is_multicast_ether_addr(nd->macaddr.a)) { 912 error_setg(errp, 913 "NIC cannot have multicast MAC address (odd 1st byte)"); 914 return -1; 915 } 916 qemu_macaddr_default_if_unset(&nd->macaddr); 917 918 if (nic->has_vectors) { 919 if (nic->vectors > 0x7ffffff) { 920 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 921 return -1; 922 } 923 nd->nvectors = nic->vectors; 924 } else { 925 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 926 } 927 928 nd->used = 1; 929 nb_nics++; 930 931 return idx; 932 } 933 934 935 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND__MAX])( 936 const NetClientOptions *opts, 937 const char *name, 938 NetClientState *peer, Error **errp) = { 939 [NET_CLIENT_OPTIONS_KIND_NIC] = net_init_nic, 940 #ifdef CONFIG_SLIRP 941 [NET_CLIENT_OPTIONS_KIND_USER] = net_init_slirp, 942 #endif 943 [NET_CLIENT_OPTIONS_KIND_TAP] = net_init_tap, 944 [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket, 945 #ifdef CONFIG_VDE 946 [NET_CLIENT_OPTIONS_KIND_VDE] = net_init_vde, 947 #endif 948 #ifdef CONFIG_NETMAP 949 [NET_CLIENT_OPTIONS_KIND_NETMAP] = net_init_netmap, 950 #endif 951 [NET_CLIENT_OPTIONS_KIND_DUMP] = net_init_dump, 952 #ifdef CONFIG_NET_BRIDGE 953 [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge, 954 #endif 955 [NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport, 956 #ifdef CONFIG_VHOST_NET_USED 957 [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user, 958 #endif 959 #ifdef CONFIG_L2TPV3 960 [NET_CLIENT_OPTIONS_KIND_L2TPV3] = net_init_l2tpv3, 961 #endif 962 }; 963 964 965 static int net_client_init1(const void *object, int is_netdev, Error **errp) 966 { 967 const NetClientOptions *opts; 968 const char *name; 969 NetClientState *peer = NULL; 970 971 if (is_netdev) { 972 const Netdev *netdev = object; 973 opts = netdev->opts; 974 name = netdev->id; 975 976 if (opts->type == NET_CLIENT_OPTIONS_KIND_DUMP || 977 opts->type == NET_CLIENT_OPTIONS_KIND_NIC || 978 !net_client_init_fun[opts->type]) { 979 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 980 "a netdev backend type"); 981 return -1; 982 } 983 } else { 984 const NetLegacy *net = object; 985 opts = net->opts; 986 /* missing optional values have been initialized to "all bits zero" */ 987 name = net->has_id ? net->id : net->name; 988 989 if (opts->type == NET_CLIENT_OPTIONS_KIND_NONE) { 990 return 0; /* nothing to do */ 991 } 992 if (opts->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) { 993 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 994 "a net type"); 995 return -1; 996 } 997 998 if (!net_client_init_fun[opts->type]) { 999 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1000 "a net backend type (maybe it is not compiled " 1001 "into this binary)"); 1002 return -1; 1003 } 1004 1005 /* Do not add to a vlan if it's a nic with a netdev= parameter. */ 1006 if (opts->type != NET_CLIENT_OPTIONS_KIND_NIC || 1007 !opts->u.nic.data->has_netdev) { 1008 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL); 1009 } 1010 } 1011 1012 if (net_client_init_fun[opts->type](opts, name, peer, errp) < 0) { 1013 /* FIXME drop when all init functions store an Error */ 1014 if (errp && !*errp) { 1015 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1016 NetClientOptionsKind_lookup[opts->type]); 1017 } 1018 return -1; 1019 } 1020 return 0; 1021 } 1022 1023 1024 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp) 1025 { 1026 void *object = NULL; 1027 Error *err = NULL; 1028 int ret = -1; 1029 OptsVisitor *ov = opts_visitor_new(opts); 1030 Visitor *v = opts_get_visitor(ov); 1031 1032 { 1033 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1034 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1035 1036 if (ip6_net) { 1037 char buf[strlen(ip6_net) + 1]; 1038 1039 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) { 1040 /* Default 64bit prefix length. */ 1041 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort); 1042 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort); 1043 } else { 1044 /* User-specified prefix length. */ 1045 unsigned long len; 1046 int err; 1047 1048 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort); 1049 err = qemu_strtoul(ip6_net, NULL, 10, &len); 1050 1051 if (err) { 1052 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1053 "ipv6-prefix", "a number"); 1054 } else { 1055 qemu_opt_set_number(opts, "ipv6-prefixlen", len, 1056 &error_abort); 1057 } 1058 } 1059 qemu_opt_unset(opts, "ipv6-net"); 1060 } 1061 } 1062 1063 if (is_netdev) { 1064 visit_type_Netdev(v, NULL, (Netdev **)&object, &err); 1065 } else { 1066 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err); 1067 } 1068 1069 if (!err) { 1070 ret = net_client_init1(object, is_netdev, &err); 1071 } 1072 1073 if (is_netdev) { 1074 qapi_free_Netdev(object); 1075 } else { 1076 qapi_free_NetLegacy(object); 1077 } 1078 1079 error_propagate(errp, err); 1080 opts_visitor_cleanup(ov); 1081 return ret; 1082 } 1083 1084 1085 static int net_host_check_device(const char *device) 1086 { 1087 int i; 1088 for (i = 0; host_net_devices[i]; i++) { 1089 if (!strncmp(host_net_devices[i], device, 1090 strlen(host_net_devices[i]))) { 1091 return 1; 1092 } 1093 } 1094 1095 return 0; 1096 } 1097 1098 void hmp_host_net_add(Monitor *mon, const QDict *qdict) 1099 { 1100 const char *device = qdict_get_str(qdict, "device"); 1101 const char *opts_str = qdict_get_try_str(qdict, "opts"); 1102 Error *local_err = NULL; 1103 QemuOpts *opts; 1104 1105 if (!net_host_check_device(device)) { 1106 monitor_printf(mon, "invalid host network device %s\n", device); 1107 return; 1108 } 1109 1110 opts = qemu_opts_parse_noisily(qemu_find_opts("net"), 1111 opts_str ? opts_str : "", false); 1112 if (!opts) { 1113 return; 1114 } 1115 1116 qemu_opt_set(opts, "type", device, &error_abort); 1117 1118 net_client_init(opts, 0, &local_err); 1119 if (local_err) { 1120 error_report_err(local_err); 1121 monitor_printf(mon, "adding host network device %s failed\n", device); 1122 } 1123 } 1124 1125 void hmp_host_net_remove(Monitor *mon, const QDict *qdict) 1126 { 1127 NetClientState *nc; 1128 int vlan_id = qdict_get_int(qdict, "vlan_id"); 1129 const char *device = qdict_get_str(qdict, "device"); 1130 1131 nc = net_hub_find_client_by_name(vlan_id, device); 1132 if (!nc) { 1133 error_report("Host network device '%s' on hub '%d' not found", 1134 device, vlan_id); 1135 return; 1136 } 1137 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1138 error_report("invalid host network device '%s'", device); 1139 return; 1140 } 1141 1142 qemu_del_net_client(nc->peer); 1143 qemu_del_net_client(nc); 1144 } 1145 1146 void netdev_add(QemuOpts *opts, Error **errp) 1147 { 1148 net_client_init(opts, 1, errp); 1149 } 1150 1151 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1152 { 1153 Error *local_err = NULL; 1154 QemuOptsList *opts_list; 1155 QemuOpts *opts; 1156 1157 opts_list = qemu_find_opts_err("netdev", &local_err); 1158 if (local_err) { 1159 goto out; 1160 } 1161 1162 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1163 if (local_err) { 1164 goto out; 1165 } 1166 1167 netdev_add(opts, &local_err); 1168 if (local_err) { 1169 qemu_opts_del(opts); 1170 goto out; 1171 } 1172 1173 out: 1174 error_propagate(errp, local_err); 1175 } 1176 1177 void qmp_netdev_del(const char *id, Error **errp) 1178 { 1179 NetClientState *nc; 1180 QemuOpts *opts; 1181 1182 nc = qemu_find_netdev(id); 1183 if (!nc) { 1184 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1185 "Device '%s' not found", id); 1186 return; 1187 } 1188 1189 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1190 if (!opts) { 1191 error_setg(errp, "Device '%s' is not a netdev", id); 1192 return; 1193 } 1194 1195 qemu_del_net_client(nc); 1196 qemu_opts_del(opts); 1197 } 1198 1199 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1200 { 1201 char *str; 1202 ObjectProperty *prop; 1203 ObjectPropertyIterator iter; 1204 StringOutputVisitor *ov; 1205 1206 /* generate info str */ 1207 object_property_iter_init(&iter, OBJECT(nf)); 1208 while ((prop = object_property_iter_next(&iter))) { 1209 if (!strcmp(prop->name, "type")) { 1210 continue; 1211 } 1212 ov = string_output_visitor_new(false); 1213 object_property_get(OBJECT(nf), string_output_get_visitor(ov), 1214 prop->name, NULL); 1215 str = string_output_get_string(ov); 1216 string_output_visitor_cleanup(ov); 1217 monitor_printf(mon, ",%s=%s", prop->name, str); 1218 g_free(str); 1219 } 1220 monitor_printf(mon, "\n"); 1221 } 1222 1223 void print_net_client(Monitor *mon, NetClientState *nc) 1224 { 1225 NetFilterState *nf; 1226 1227 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1228 nc->queue_index, 1229 NetClientOptionsKind_lookup[nc->info->type], 1230 nc->info_str); 1231 if (!QTAILQ_EMPTY(&nc->filters)) { 1232 monitor_printf(mon, "filters:\n"); 1233 } 1234 QTAILQ_FOREACH(nf, &nc->filters, next) { 1235 char *path = object_get_canonical_path_component(OBJECT(nf)); 1236 1237 monitor_printf(mon, " - %s: type=%s", path, 1238 object_get_typename(OBJECT(nf))); 1239 netfilter_print_info(mon, nf); 1240 g_free(path); 1241 } 1242 } 1243 1244 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1245 Error **errp) 1246 { 1247 NetClientState *nc; 1248 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1249 1250 QTAILQ_FOREACH(nc, &net_clients, next) { 1251 RxFilterInfoList *entry; 1252 RxFilterInfo *info; 1253 1254 if (has_name && strcmp(nc->name, name) != 0) { 1255 continue; 1256 } 1257 1258 /* only query rx-filter information of NIC */ 1259 if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) { 1260 if (has_name) { 1261 error_setg(errp, "net client(%s) isn't a NIC", name); 1262 return NULL; 1263 } 1264 continue; 1265 } 1266 1267 /* only query information on queue 0 since the info is per nic, 1268 * not per queue 1269 */ 1270 if (nc->queue_index != 0) 1271 continue; 1272 1273 if (nc->info->query_rx_filter) { 1274 info = nc->info->query_rx_filter(nc); 1275 entry = g_malloc0(sizeof(*entry)); 1276 entry->value = info; 1277 1278 if (!filter_list) { 1279 filter_list = entry; 1280 } else { 1281 last_entry->next = entry; 1282 } 1283 last_entry = entry; 1284 } else if (has_name) { 1285 error_setg(errp, "net client(%s) doesn't support" 1286 " rx-filter querying", name); 1287 return NULL; 1288 } 1289 1290 if (has_name) { 1291 break; 1292 } 1293 } 1294 1295 if (filter_list == NULL && has_name) { 1296 error_setg(errp, "invalid net client name: %s", name); 1297 } 1298 1299 return filter_list; 1300 } 1301 1302 void hmp_info_network(Monitor *mon, const QDict *qdict) 1303 { 1304 NetClientState *nc, *peer; 1305 NetClientOptionsKind type; 1306 1307 net_hub_info(mon); 1308 1309 QTAILQ_FOREACH(nc, &net_clients, next) { 1310 peer = nc->peer; 1311 type = nc->info->type; 1312 1313 /* Skip if already printed in hub info */ 1314 if (net_hub_id_for_client(nc, NULL) == 0) { 1315 continue; 1316 } 1317 1318 if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) { 1319 print_net_client(mon, nc); 1320 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1321 if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) { 1322 monitor_printf(mon, " \\ "); 1323 print_net_client(mon, peer); 1324 } 1325 } 1326 } 1327 1328 void qmp_set_link(const char *name, bool up, Error **errp) 1329 { 1330 NetClientState *ncs[MAX_QUEUE_NUM]; 1331 NetClientState *nc; 1332 int queues, i; 1333 1334 queues = qemu_find_net_clients_except(name, ncs, 1335 NET_CLIENT_OPTIONS_KIND__MAX, 1336 MAX_QUEUE_NUM); 1337 1338 if (queues == 0) { 1339 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1340 "Device '%s' not found", name); 1341 return; 1342 } 1343 nc = ncs[0]; 1344 1345 for (i = 0; i < queues; i++) { 1346 ncs[i]->link_down = !up; 1347 } 1348 1349 if (nc->info->link_status_changed) { 1350 nc->info->link_status_changed(nc); 1351 } 1352 1353 if (nc->peer) { 1354 /* Change peer link only if the peer is NIC and then notify peer. 1355 * If the peer is a HUBPORT or a backend, we do not change the 1356 * link status. 1357 * 1358 * This behavior is compatible with qemu vlans where there could be 1359 * multiple clients that can still communicate with each other in 1360 * disconnected mode. For now maintain this compatibility. 1361 */ 1362 if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1363 for (i = 0; i < queues; i++) { 1364 ncs[i]->peer->link_down = !up; 1365 } 1366 } 1367 if (nc->peer->info->link_status_changed) { 1368 nc->peer->info->link_status_changed(nc->peer); 1369 } 1370 } 1371 } 1372 1373 static void net_vm_change_state_handler(void *opaque, int running, 1374 RunState state) 1375 { 1376 NetClientState *nc; 1377 NetClientState *tmp; 1378 1379 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1380 if (running) { 1381 /* Flush queued packets and wake up backends. */ 1382 if (nc->peer && qemu_can_send_packet(nc)) { 1383 qemu_flush_queued_packets(nc->peer); 1384 } 1385 } else { 1386 /* Complete all queued packets, to guarantee we don't modify 1387 * state later when VM is not running. 1388 */ 1389 qemu_flush_or_purge_queued_packets(nc, true); 1390 } 1391 } 1392 } 1393 1394 void net_cleanup(void) 1395 { 1396 NetClientState *nc; 1397 1398 /* We may del multiple entries during qemu_del_net_client(), 1399 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1400 */ 1401 while (!QTAILQ_EMPTY(&net_clients)) { 1402 nc = QTAILQ_FIRST(&net_clients); 1403 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1404 qemu_del_nic(qemu_get_nic(nc)); 1405 } else { 1406 qemu_del_net_client(nc); 1407 } 1408 } 1409 1410 qemu_del_vm_change_state_handler(net_change_state_entry); 1411 } 1412 1413 void net_check_clients(void) 1414 { 1415 NetClientState *nc; 1416 int i; 1417 1418 /* Don't warn about the default network setup that you get if 1419 * no command line -net or -netdev options are specified. There 1420 * are two cases that we would otherwise complain about: 1421 * (1) board doesn't support a NIC but the implicit "-net nic" 1422 * requested one 1423 * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic" 1424 * sets up a nic that isn't connected to anything. 1425 */ 1426 if (default_net) { 1427 return; 1428 } 1429 1430 net_hub_check_clients(); 1431 1432 QTAILQ_FOREACH(nc, &net_clients, next) { 1433 if (!nc->peer) { 1434 fprintf(stderr, "Warning: %s %s has no peer\n", 1435 nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ? 1436 "nic" : "netdev", nc->name); 1437 } 1438 } 1439 1440 /* Check that all NICs requested via -net nic actually got created. 1441 * NICs created via -device don't need to be checked here because 1442 * they are always instantiated. 1443 */ 1444 for (i = 0; i < MAX_NICS; i++) { 1445 NICInfo *nd = &nd_table[i]; 1446 if (nd->used && !nd->instantiated) { 1447 fprintf(stderr, "Warning: requested NIC (%s, model %s) " 1448 "was not created (not supported by this machine?)\n", 1449 nd->name ? nd->name : "anonymous", 1450 nd->model ? nd->model : "unspecified"); 1451 } 1452 } 1453 } 1454 1455 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1456 { 1457 Error *local_err = NULL; 1458 1459 net_client_init(opts, 0, &local_err); 1460 if (local_err) { 1461 error_report_err(local_err); 1462 return -1; 1463 } 1464 1465 return 0; 1466 } 1467 1468 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1469 { 1470 Error *local_err = NULL; 1471 int ret; 1472 1473 ret = net_client_init(opts, 1, &local_err); 1474 if (local_err) { 1475 error_report_err(local_err); 1476 return -1; 1477 } 1478 1479 return ret; 1480 } 1481 1482 int net_init_clients(void) 1483 { 1484 QemuOptsList *net = qemu_find_opts("net"); 1485 1486 if (default_net) { 1487 /* if no clients, we use a default config */ 1488 qemu_opts_set(net, NULL, "type", "nic", &error_abort); 1489 #ifdef CONFIG_SLIRP 1490 qemu_opts_set(net, NULL, "type", "user", &error_abort); 1491 #endif 1492 } 1493 1494 net_change_state_entry = 1495 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1496 1497 QTAILQ_INIT(&net_clients); 1498 1499 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1500 net_init_netdev, NULL, NULL)) { 1501 return -1; 1502 } 1503 1504 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) { 1505 return -1; 1506 } 1507 1508 return 0; 1509 } 1510 1511 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1512 { 1513 #if defined(CONFIG_SLIRP) 1514 int ret; 1515 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) { 1516 return ret; 1517 } 1518 #endif 1519 1520 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1521 return -1; 1522 } 1523 1524 default_net = 0; 1525 return 0; 1526 } 1527 1528 /* From FreeBSD */ 1529 /* XXX: optimize */ 1530 unsigned compute_mcast_idx(const uint8_t *ep) 1531 { 1532 uint32_t crc; 1533 int carry, i, j; 1534 uint8_t b; 1535 1536 crc = 0xffffffff; 1537 for (i = 0; i < 6; i++) { 1538 b = *ep++; 1539 for (j = 0; j < 8; j++) { 1540 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1541 crc <<= 1; 1542 b >>= 1; 1543 if (carry) { 1544 crc = ((crc ^ POLYNOMIAL) | carry); 1545 } 1546 } 1547 } 1548 return crc >> 26; 1549 } 1550 1551 QemuOptsList qemu_netdev_opts = { 1552 .name = "netdev", 1553 .implied_opt_name = "type", 1554 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1555 .desc = { 1556 /* 1557 * no elements => accept any params 1558 * validation will happen later 1559 */ 1560 { /* end of list */ } 1561 }, 1562 }; 1563 1564 QemuOptsList qemu_net_opts = { 1565 .name = "net", 1566 .implied_opt_name = "type", 1567 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1568 .desc = { 1569 /* 1570 * no elements => accept any params 1571 * validation will happen later 1572 */ 1573 { /* end of list */ } 1574 }, 1575 }; 1576