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 /***********************************************************/ 80 /* network device redirectors */ 81 82 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 83 { 84 const char *p, *p1; 85 int len; 86 p = *pp; 87 p1 = strchr(p, sep); 88 if (!p1) 89 return -1; 90 len = p1 - p; 91 p1++; 92 if (buf_size > 0) { 93 if (len > buf_size - 1) 94 len = buf_size - 1; 95 memcpy(buf, p, len); 96 buf[len] = '\0'; 97 } 98 *pp = p1; 99 return 0; 100 } 101 102 int parse_host_port(struct sockaddr_in *saddr, const char *str) 103 { 104 char buf[512]; 105 struct hostent *he; 106 const char *p, *r; 107 int port; 108 109 p = str; 110 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) 111 return -1; 112 saddr->sin_family = AF_INET; 113 if (buf[0] == '\0') { 114 saddr->sin_addr.s_addr = 0; 115 } else { 116 if (qemu_isdigit(buf[0])) { 117 if (!inet_aton(buf, &saddr->sin_addr)) 118 return -1; 119 } else { 120 if ((he = gethostbyname(buf)) == NULL) 121 return - 1; 122 saddr->sin_addr = *(struct in_addr *)he->h_addr; 123 } 124 } 125 port = strtol(p, (char **)&r, 0); 126 if (r == p) 127 return -1; 128 saddr->sin_port = htons(port); 129 return 0; 130 } 131 132 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 133 { 134 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 135 macaddr[0], macaddr[1], macaddr[2], 136 macaddr[3], macaddr[4], macaddr[5]); 137 } 138 139 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 140 { 141 snprintf(nc->info_str, sizeof(nc->info_str), 142 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 143 nc->model, 144 macaddr[0], macaddr[1], macaddr[2], 145 macaddr[3], macaddr[4], macaddr[5]); 146 } 147 148 static int mac_table[256] = {0}; 149 150 static void qemu_macaddr_set_used(MACAddr *macaddr) 151 { 152 int index; 153 154 for (index = 0x56; index < 0xFF; index++) { 155 if (macaddr->a[5] == index) { 156 mac_table[index]++; 157 } 158 } 159 } 160 161 static void qemu_macaddr_set_free(MACAddr *macaddr) 162 { 163 int index; 164 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 165 166 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 167 return; 168 } 169 for (index = 0x56; index < 0xFF; index++) { 170 if (macaddr->a[5] == index) { 171 mac_table[index]--; 172 } 173 } 174 } 175 176 static int qemu_macaddr_get_free(void) 177 { 178 int index; 179 180 for (index = 0x56; index < 0xFF; index++) { 181 if (mac_table[index] == 0) { 182 return index; 183 } 184 } 185 186 return -1; 187 } 188 189 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 190 { 191 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 192 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 193 194 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 195 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 196 return; 197 } else { 198 qemu_macaddr_set_used(macaddr); 199 return; 200 } 201 } 202 203 macaddr->a[0] = 0x52; 204 macaddr->a[1] = 0x54; 205 macaddr->a[2] = 0x00; 206 macaddr->a[3] = 0x12; 207 macaddr->a[4] = 0x34; 208 macaddr->a[5] = qemu_macaddr_get_free(); 209 qemu_macaddr_set_used(macaddr); 210 } 211 212 /** 213 * Generate a name for net client 214 * 215 * Only net clients created with the legacy -net option and NICs need this. 216 */ 217 static char *assign_name(NetClientState *nc1, const char *model) 218 { 219 NetClientState *nc; 220 int id = 0; 221 222 QTAILQ_FOREACH(nc, &net_clients, next) { 223 if (nc == nc1) { 224 continue; 225 } 226 if (strcmp(nc->model, model) == 0) { 227 id++; 228 } 229 } 230 231 return g_strdup_printf("%s.%d", model, id); 232 } 233 234 static void qemu_net_client_destructor(NetClientState *nc) 235 { 236 g_free(nc); 237 } 238 239 static void qemu_net_client_setup(NetClientState *nc, 240 NetClientInfo *info, 241 NetClientState *peer, 242 const char *model, 243 const char *name, 244 NetClientDestructor *destructor) 245 { 246 nc->info = info; 247 nc->model = g_strdup(model); 248 if (name) { 249 nc->name = g_strdup(name); 250 } else { 251 nc->name = assign_name(nc, model); 252 } 253 254 if (peer) { 255 assert(!peer->peer); 256 nc->peer = peer; 257 peer->peer = nc; 258 } 259 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 260 261 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 262 nc->destructor = destructor; 263 QTAILQ_INIT(&nc->filters); 264 } 265 266 NetClientState *qemu_new_net_client(NetClientInfo *info, 267 NetClientState *peer, 268 const char *model, 269 const char *name) 270 { 271 NetClientState *nc; 272 273 assert(info->size >= sizeof(NetClientState)); 274 275 nc = g_malloc0(info->size); 276 qemu_net_client_setup(nc, info, peer, model, name, 277 qemu_net_client_destructor); 278 279 return nc; 280 } 281 282 NICState *qemu_new_nic(NetClientInfo *info, 283 NICConf *conf, 284 const char *model, 285 const char *name, 286 void *opaque) 287 { 288 NetClientState **peers = conf->peers.ncs; 289 NICState *nic; 290 int i, queues = MAX(1, conf->peers.queues); 291 292 assert(info->type == NET_CLIENT_DRIVER_NIC); 293 assert(info->size >= sizeof(NICState)); 294 295 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 296 nic->ncs = (void *)nic + info->size; 297 nic->conf = conf; 298 nic->opaque = opaque; 299 300 for (i = 0; i < queues; i++) { 301 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 302 NULL); 303 nic->ncs[i].queue_index = i; 304 } 305 306 return nic; 307 } 308 309 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 310 { 311 return nic->ncs + queue_index; 312 } 313 314 NetClientState *qemu_get_queue(NICState *nic) 315 { 316 return qemu_get_subqueue(nic, 0); 317 } 318 319 NICState *qemu_get_nic(NetClientState *nc) 320 { 321 NetClientState *nc0 = nc - nc->queue_index; 322 323 return (NICState *)((void *)nc0 - nc->info->size); 324 } 325 326 void *qemu_get_nic_opaque(NetClientState *nc) 327 { 328 NICState *nic = qemu_get_nic(nc); 329 330 return nic->opaque; 331 } 332 333 static void qemu_cleanup_net_client(NetClientState *nc) 334 { 335 QTAILQ_REMOVE(&net_clients, nc, next); 336 337 if (nc->info->cleanup) { 338 nc->info->cleanup(nc); 339 } 340 } 341 342 static void qemu_free_net_client(NetClientState *nc) 343 { 344 if (nc->incoming_queue) { 345 qemu_del_net_queue(nc->incoming_queue); 346 } 347 if (nc->peer) { 348 nc->peer->peer = NULL; 349 } 350 g_free(nc->name); 351 g_free(nc->model); 352 if (nc->destructor) { 353 nc->destructor(nc); 354 } 355 } 356 357 void qemu_del_net_client(NetClientState *nc) 358 { 359 NetClientState *ncs[MAX_QUEUE_NUM]; 360 int queues, i; 361 NetFilterState *nf, *next; 362 363 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 364 365 /* If the NetClientState belongs to a multiqueue backend, we will change all 366 * other NetClientStates also. 367 */ 368 queues = qemu_find_net_clients_except(nc->name, ncs, 369 NET_CLIENT_DRIVER_NIC, 370 MAX_QUEUE_NUM); 371 assert(queues != 0); 372 373 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 374 object_unparent(OBJECT(nf)); 375 } 376 377 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 378 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 379 NICState *nic = qemu_get_nic(nc->peer); 380 if (nic->peer_deleted) { 381 return; 382 } 383 nic->peer_deleted = true; 384 385 for (i = 0; i < queues; i++) { 386 ncs[i]->peer->link_down = true; 387 } 388 389 if (nc->peer->info->link_status_changed) { 390 nc->peer->info->link_status_changed(nc->peer); 391 } 392 393 for (i = 0; i < queues; i++) { 394 qemu_cleanup_net_client(ncs[i]); 395 } 396 397 return; 398 } 399 400 for (i = 0; i < queues; i++) { 401 qemu_cleanup_net_client(ncs[i]); 402 qemu_free_net_client(ncs[i]); 403 } 404 } 405 406 void qemu_del_nic(NICState *nic) 407 { 408 int i, queues = MAX(nic->conf->peers.queues, 1); 409 410 qemu_macaddr_set_free(&nic->conf->macaddr); 411 412 /* If this is a peer NIC and peer has already been deleted, free it now. */ 413 if (nic->peer_deleted) { 414 for (i = 0; i < queues; i++) { 415 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 416 } 417 } 418 419 for (i = queues - 1; i >= 0; i--) { 420 NetClientState *nc = qemu_get_subqueue(nic, i); 421 422 qemu_cleanup_net_client(nc); 423 qemu_free_net_client(nc); 424 } 425 426 g_free(nic); 427 } 428 429 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 430 { 431 NetClientState *nc; 432 433 QTAILQ_FOREACH(nc, &net_clients, next) { 434 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 435 if (nc->queue_index == 0) { 436 func(qemu_get_nic(nc), opaque); 437 } 438 } 439 } 440 } 441 442 bool qemu_has_ufo(NetClientState *nc) 443 { 444 if (!nc || !nc->info->has_ufo) { 445 return false; 446 } 447 448 return nc->info->has_ufo(nc); 449 } 450 451 bool qemu_has_vnet_hdr(NetClientState *nc) 452 { 453 if (!nc || !nc->info->has_vnet_hdr) { 454 return false; 455 } 456 457 return nc->info->has_vnet_hdr(nc); 458 } 459 460 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 461 { 462 if (!nc || !nc->info->has_vnet_hdr_len) { 463 return false; 464 } 465 466 return nc->info->has_vnet_hdr_len(nc, len); 467 } 468 469 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 470 { 471 if (!nc || !nc->info->using_vnet_hdr) { 472 return; 473 } 474 475 nc->info->using_vnet_hdr(nc, enable); 476 } 477 478 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 479 int ecn, int ufo) 480 { 481 if (!nc || !nc->info->set_offload) { 482 return; 483 } 484 485 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 486 } 487 488 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 489 { 490 if (!nc || !nc->info->set_vnet_hdr_len) { 491 return; 492 } 493 494 nc->info->set_vnet_hdr_len(nc, len); 495 } 496 497 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 498 { 499 #ifdef HOST_WORDS_BIGENDIAN 500 if (!nc || !nc->info->set_vnet_le) { 501 return -ENOSYS; 502 } 503 504 return nc->info->set_vnet_le(nc, is_le); 505 #else 506 return 0; 507 #endif 508 } 509 510 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 511 { 512 #ifdef HOST_WORDS_BIGENDIAN 513 return 0; 514 #else 515 if (!nc || !nc->info->set_vnet_be) { 516 return -ENOSYS; 517 } 518 519 return nc->info->set_vnet_be(nc, is_be); 520 #endif 521 } 522 523 int qemu_can_send_packet(NetClientState *sender) 524 { 525 int vm_running = runstate_is_running(); 526 527 if (!vm_running) { 528 return 0; 529 } 530 531 if (!sender->peer) { 532 return 1; 533 } 534 535 if (sender->peer->receive_disabled) { 536 return 0; 537 } else if (sender->peer->info->can_receive && 538 !sender->peer->info->can_receive(sender->peer)) { 539 return 0; 540 } 541 return 1; 542 } 543 544 static ssize_t filter_receive_iov(NetClientState *nc, 545 NetFilterDirection direction, 546 NetClientState *sender, 547 unsigned flags, 548 const struct iovec *iov, 549 int iovcnt, 550 NetPacketSent *sent_cb) 551 { 552 ssize_t ret = 0; 553 NetFilterState *nf = NULL; 554 555 if (direction == NET_FILTER_DIRECTION_TX) { 556 QTAILQ_FOREACH(nf, &nc->filters, next) { 557 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 558 iovcnt, sent_cb); 559 if (ret) { 560 return ret; 561 } 562 } 563 } else { 564 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) { 565 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 566 iovcnt, sent_cb); 567 if (ret) { 568 return ret; 569 } 570 } 571 } 572 573 return ret; 574 } 575 576 static ssize_t filter_receive(NetClientState *nc, 577 NetFilterDirection direction, 578 NetClientState *sender, 579 unsigned flags, 580 const uint8_t *data, 581 size_t size, 582 NetPacketSent *sent_cb) 583 { 584 struct iovec iov = { 585 .iov_base = (void *)data, 586 .iov_len = size 587 }; 588 589 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 590 } 591 592 void qemu_purge_queued_packets(NetClientState *nc) 593 { 594 if (!nc->peer) { 595 return; 596 } 597 598 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 599 } 600 601 static 602 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 603 { 604 nc->receive_disabled = 0; 605 606 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 607 if (net_hub_flush(nc->peer)) { 608 qemu_notify_event(); 609 } 610 } 611 if (qemu_net_queue_flush(nc->incoming_queue)) { 612 /* We emptied the queue successfully, signal to the IO thread to repoll 613 * the file descriptor (for tap, for example). 614 */ 615 qemu_notify_event(); 616 } else if (purge) { 617 /* Unable to empty the queue, purge remaining packets */ 618 qemu_net_queue_purge(nc->incoming_queue, nc); 619 } 620 } 621 622 void qemu_flush_queued_packets(NetClientState *nc) 623 { 624 qemu_flush_or_purge_queued_packets(nc, false); 625 } 626 627 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 628 unsigned flags, 629 const uint8_t *buf, int size, 630 NetPacketSent *sent_cb) 631 { 632 NetQueue *queue; 633 int ret; 634 635 #ifdef DEBUG_NET 636 printf("qemu_send_packet_async:\n"); 637 qemu_hexdump((const char *)buf, stdout, "net", size); 638 #endif 639 640 if (sender->link_down || !sender->peer) { 641 return size; 642 } 643 644 /* Let filters handle the packet first */ 645 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 646 sender, flags, buf, size, sent_cb); 647 if (ret) { 648 return ret; 649 } 650 651 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 652 sender, flags, buf, size, sent_cb); 653 if (ret) { 654 return ret; 655 } 656 657 queue = sender->peer->incoming_queue; 658 659 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 660 } 661 662 ssize_t qemu_send_packet_async(NetClientState *sender, 663 const uint8_t *buf, int size, 664 NetPacketSent *sent_cb) 665 { 666 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 667 buf, size, sent_cb); 668 } 669 670 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 671 { 672 qemu_send_packet_async(nc, buf, size, NULL); 673 } 674 675 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 676 { 677 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 678 buf, size, NULL); 679 } 680 681 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 682 int iovcnt, unsigned flags) 683 { 684 uint8_t *buf = NULL; 685 uint8_t *buffer; 686 size_t offset; 687 ssize_t ret; 688 689 if (iovcnt == 1) { 690 buffer = iov[0].iov_base; 691 offset = iov[0].iov_len; 692 } else { 693 offset = iov_size(iov, iovcnt); 694 if (offset > NET_BUFSIZE) { 695 return -1; 696 } 697 buf = g_malloc(offset); 698 buffer = buf; 699 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 700 } 701 702 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 703 ret = nc->info->receive_raw(nc, buffer, offset); 704 } else { 705 ret = nc->info->receive(nc, buffer, offset); 706 } 707 708 g_free(buf); 709 return ret; 710 } 711 712 ssize_t qemu_deliver_packet_iov(NetClientState *sender, 713 unsigned flags, 714 const struct iovec *iov, 715 int iovcnt, 716 void *opaque) 717 { 718 NetClientState *nc = opaque; 719 int ret; 720 721 if (nc->link_down) { 722 return iov_size(iov, iovcnt); 723 } 724 725 if (nc->receive_disabled) { 726 return 0; 727 } 728 729 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 730 ret = nc->info->receive_iov(nc, iov, iovcnt); 731 } else { 732 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 733 } 734 735 if (ret == 0) { 736 nc->receive_disabled = 1; 737 } 738 739 return ret; 740 } 741 742 ssize_t qemu_sendv_packet_async(NetClientState *sender, 743 const struct iovec *iov, int iovcnt, 744 NetPacketSent *sent_cb) 745 { 746 NetQueue *queue; 747 int ret; 748 749 if (sender->link_down || !sender->peer) { 750 return iov_size(iov, iovcnt); 751 } 752 753 /* Let filters handle the packet first */ 754 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 755 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 756 if (ret) { 757 return ret; 758 } 759 760 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 761 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 762 if (ret) { 763 return ret; 764 } 765 766 queue = sender->peer->incoming_queue; 767 768 return qemu_net_queue_send_iov(queue, sender, 769 QEMU_NET_PACKET_FLAG_NONE, 770 iov, iovcnt, sent_cb); 771 } 772 773 ssize_t 774 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 775 { 776 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 777 } 778 779 NetClientState *qemu_find_netdev(const char *id) 780 { 781 NetClientState *nc; 782 783 QTAILQ_FOREACH(nc, &net_clients, next) { 784 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 785 continue; 786 if (!strcmp(nc->name, id)) { 787 return nc; 788 } 789 } 790 791 return NULL; 792 } 793 794 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 795 NetClientDriver type, int max) 796 { 797 NetClientState *nc; 798 int ret = 0; 799 800 QTAILQ_FOREACH(nc, &net_clients, next) { 801 if (nc->info->type == type) { 802 continue; 803 } 804 if (!id || !strcmp(nc->name, id)) { 805 if (ret < max) { 806 ncs[ret] = nc; 807 } 808 ret++; 809 } 810 } 811 812 return ret; 813 } 814 815 static int nic_get_free_idx(void) 816 { 817 int index; 818 819 for (index = 0; index < MAX_NICS; index++) 820 if (!nd_table[index].used) 821 return index; 822 return -1; 823 } 824 825 int qemu_show_nic_models(const char *arg, const char *const *models) 826 { 827 int i; 828 829 if (!arg || !is_help_option(arg)) { 830 return 0; 831 } 832 833 fprintf(stderr, "qemu: Supported NIC models: "); 834 for (i = 0 ; models[i]; i++) 835 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); 836 return 1; 837 } 838 839 void qemu_check_nic_model(NICInfo *nd, const char *model) 840 { 841 const char *models[2]; 842 843 models[0] = model; 844 models[1] = NULL; 845 846 if (qemu_show_nic_models(nd->model, models)) 847 exit(0); 848 if (qemu_find_nic_model(nd, models, model) < 0) 849 exit(1); 850 } 851 852 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 853 const char *default_model) 854 { 855 int i; 856 857 if (!nd->model) 858 nd->model = g_strdup(default_model); 859 860 for (i = 0 ; models[i]; i++) { 861 if (strcmp(nd->model, models[i]) == 0) 862 return i; 863 } 864 865 error_report("Unsupported NIC model: %s", nd->model); 866 return -1; 867 } 868 869 static int net_init_nic(const Netdev *netdev, const char *name, 870 NetClientState *peer, Error **errp) 871 { 872 int idx; 873 NICInfo *nd; 874 const NetLegacyNicOptions *nic; 875 876 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 877 nic = &netdev->u.nic; 878 879 idx = nic_get_free_idx(); 880 if (idx == -1 || nb_nics >= MAX_NICS) { 881 error_setg(errp, "too many NICs"); 882 return -1; 883 } 884 885 nd = &nd_table[idx]; 886 887 memset(nd, 0, sizeof(*nd)); 888 889 if (nic->has_netdev) { 890 nd->netdev = qemu_find_netdev(nic->netdev); 891 if (!nd->netdev) { 892 error_setg(errp, "netdev '%s' not found", nic->netdev); 893 return -1; 894 } 895 } else { 896 assert(peer); 897 nd->netdev = peer; 898 } 899 nd->name = g_strdup(name); 900 if (nic->has_model) { 901 nd->model = g_strdup(nic->model); 902 } 903 if (nic->has_addr) { 904 nd->devaddr = g_strdup(nic->addr); 905 } 906 907 if (nic->has_macaddr && 908 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 909 error_setg(errp, "invalid syntax for ethernet address"); 910 return -1; 911 } 912 if (nic->has_macaddr && 913 is_multicast_ether_addr(nd->macaddr.a)) { 914 error_setg(errp, 915 "NIC cannot have multicast MAC address (odd 1st byte)"); 916 return -1; 917 } 918 qemu_macaddr_default_if_unset(&nd->macaddr); 919 920 if (nic->has_vectors) { 921 if (nic->vectors > 0x7ffffff) { 922 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 923 return -1; 924 } 925 nd->nvectors = nic->vectors; 926 } else { 927 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 928 } 929 930 nd->used = 1; 931 nb_nics++; 932 933 return idx; 934 } 935 936 937 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 938 const Netdev *netdev, 939 const char *name, 940 NetClientState *peer, Error **errp) = { 941 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 942 #ifdef CONFIG_SLIRP 943 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 944 #endif 945 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 946 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 947 #ifdef CONFIG_VDE 948 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 949 #endif 950 #ifdef CONFIG_NETMAP 951 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 952 #endif 953 [NET_CLIENT_DRIVER_DUMP] = net_init_dump, 954 #ifdef CONFIG_NET_BRIDGE 955 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 956 #endif 957 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 958 #ifdef CONFIG_VHOST_NET_USED 959 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 960 #endif 961 #ifdef CONFIG_L2TPV3 962 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 963 #endif 964 }; 965 966 967 static int net_client_init1(const void *object, bool is_netdev, Error **errp) 968 { 969 Netdev legacy = {0}; 970 const Netdev *netdev; 971 const char *name; 972 NetClientState *peer = NULL; 973 static bool vlan_warned; 974 975 if (is_netdev) { 976 netdev = object; 977 name = netdev->id; 978 979 if (netdev->type == NET_CLIENT_DRIVER_DUMP || 980 netdev->type == NET_CLIENT_DRIVER_NIC || 981 !net_client_init_fun[netdev->type]) { 982 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 983 "a netdev backend type"); 984 return -1; 985 } 986 } else { 987 const NetLegacy *net = object; 988 const NetLegacyOptions *opts = net->opts; 989 legacy.id = net->id; 990 netdev = &legacy; 991 /* missing optional values have been initialized to "all bits zero" */ 992 name = net->has_id ? net->id : net->name; 993 994 /* Map the old options to the new flat type */ 995 switch (opts->type) { 996 case NET_LEGACY_OPTIONS_TYPE_NONE: 997 return 0; /* nothing to do */ 998 case NET_LEGACY_OPTIONS_TYPE_NIC: 999 legacy.type = NET_CLIENT_DRIVER_NIC; 1000 legacy.u.nic = opts->u.nic; 1001 break; 1002 case NET_LEGACY_OPTIONS_TYPE_USER: 1003 legacy.type = NET_CLIENT_DRIVER_USER; 1004 legacy.u.user = opts->u.user; 1005 break; 1006 case NET_LEGACY_OPTIONS_TYPE_TAP: 1007 legacy.type = NET_CLIENT_DRIVER_TAP; 1008 legacy.u.tap = opts->u.tap; 1009 break; 1010 case NET_LEGACY_OPTIONS_TYPE_L2TPV3: 1011 legacy.type = NET_CLIENT_DRIVER_L2TPV3; 1012 legacy.u.l2tpv3 = opts->u.l2tpv3; 1013 break; 1014 case NET_LEGACY_OPTIONS_TYPE_SOCKET: 1015 legacy.type = NET_CLIENT_DRIVER_SOCKET; 1016 legacy.u.socket = opts->u.socket; 1017 break; 1018 case NET_LEGACY_OPTIONS_TYPE_VDE: 1019 legacy.type = NET_CLIENT_DRIVER_VDE; 1020 legacy.u.vde = opts->u.vde; 1021 break; 1022 case NET_LEGACY_OPTIONS_TYPE_DUMP: 1023 legacy.type = NET_CLIENT_DRIVER_DUMP; 1024 legacy.u.dump = opts->u.dump; 1025 break; 1026 case NET_LEGACY_OPTIONS_TYPE_BRIDGE: 1027 legacy.type = NET_CLIENT_DRIVER_BRIDGE; 1028 legacy.u.bridge = opts->u.bridge; 1029 break; 1030 case NET_LEGACY_OPTIONS_TYPE_NETMAP: 1031 legacy.type = NET_CLIENT_DRIVER_NETMAP; 1032 legacy.u.netmap = opts->u.netmap; 1033 break; 1034 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER: 1035 legacy.type = NET_CLIENT_DRIVER_VHOST_USER; 1036 legacy.u.vhost_user = opts->u.vhost_user; 1037 break; 1038 default: 1039 abort(); 1040 } 1041 1042 if (!net_client_init_fun[netdev->type]) { 1043 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1044 "a net backend type (maybe it is not compiled " 1045 "into this binary)"); 1046 return -1; 1047 } 1048 1049 /* Do not add to a vlan if it's a nic with a netdev= parameter. */ 1050 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1051 !opts->u.nic.has_netdev) { 1052 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL); 1053 } 1054 1055 if (net->has_vlan && !vlan_warned) { 1056 error_report("'vlan' is deprecated. Please use 'netdev' instead."); 1057 vlan_warned = true; 1058 } 1059 } 1060 1061 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) { 1062 /* FIXME drop when all init functions store an Error */ 1063 if (errp && !*errp) { 1064 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1065 NetClientDriver_lookup[netdev->type]); 1066 } 1067 return -1; 1068 } 1069 return 0; 1070 } 1071 1072 1073 int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1074 { 1075 void *object = NULL; 1076 Error *err = NULL; 1077 int ret = -1; 1078 Visitor *v = opts_visitor_new(opts); 1079 1080 { 1081 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1082 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1083 1084 if (ip6_net) { 1085 char buf[strlen(ip6_net) + 1]; 1086 1087 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) { 1088 /* Default 64bit prefix length. */ 1089 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort); 1090 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort); 1091 } else { 1092 /* User-specified prefix length. */ 1093 unsigned long len; 1094 int err; 1095 1096 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort); 1097 err = qemu_strtoul(ip6_net, NULL, 10, &len); 1098 1099 if (err) { 1100 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1101 "ipv6-prefix", "a number"); 1102 } else { 1103 qemu_opt_set_number(opts, "ipv6-prefixlen", len, 1104 &error_abort); 1105 } 1106 } 1107 qemu_opt_unset(opts, "ipv6-net"); 1108 } 1109 } 1110 1111 if (is_netdev) { 1112 visit_type_Netdev(v, NULL, (Netdev **)&object, &err); 1113 } else { 1114 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err); 1115 } 1116 1117 if (!err) { 1118 ret = net_client_init1(object, is_netdev, &err); 1119 } 1120 1121 if (is_netdev) { 1122 qapi_free_Netdev(object); 1123 } else { 1124 qapi_free_NetLegacy(object); 1125 } 1126 1127 error_propagate(errp, err); 1128 visit_free(v); 1129 return ret; 1130 } 1131 1132 1133 static int net_host_check_device(const char *device) 1134 { 1135 int i; 1136 for (i = 0; host_net_devices[i]; i++) { 1137 if (!strncmp(host_net_devices[i], device, 1138 strlen(host_net_devices[i]))) { 1139 return 1; 1140 } 1141 } 1142 1143 return 0; 1144 } 1145 1146 void hmp_host_net_add(Monitor *mon, const QDict *qdict) 1147 { 1148 const char *device = qdict_get_str(qdict, "device"); 1149 const char *opts_str = qdict_get_try_str(qdict, "opts"); 1150 Error *local_err = NULL; 1151 QemuOpts *opts; 1152 1153 if (!net_host_check_device(device)) { 1154 monitor_printf(mon, "invalid host network device %s\n", device); 1155 return; 1156 } 1157 1158 opts = qemu_opts_parse_noisily(qemu_find_opts("net"), 1159 opts_str ? opts_str : "", false); 1160 if (!opts) { 1161 return; 1162 } 1163 1164 qemu_opt_set(opts, "type", device, &error_abort); 1165 1166 net_client_init(opts, false, &local_err); 1167 if (local_err) { 1168 error_report_err(local_err); 1169 monitor_printf(mon, "adding host network device %s failed\n", device); 1170 } 1171 } 1172 1173 void hmp_host_net_remove(Monitor *mon, const QDict *qdict) 1174 { 1175 NetClientState *nc; 1176 int vlan_id = qdict_get_int(qdict, "vlan_id"); 1177 const char *device = qdict_get_str(qdict, "device"); 1178 1179 nc = net_hub_find_client_by_name(vlan_id, device); 1180 if (!nc) { 1181 error_report("Host network device '%s' on hub '%d' not found", 1182 device, vlan_id); 1183 return; 1184 } 1185 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1186 error_report("invalid host network device '%s'", device); 1187 return; 1188 } 1189 1190 qemu_del_net_client(nc->peer); 1191 qemu_del_net_client(nc); 1192 qemu_opts_del(qemu_opts_find(qemu_find_opts("net"), device)); 1193 } 1194 1195 void netdev_add(QemuOpts *opts, Error **errp) 1196 { 1197 net_client_init(opts, true, errp); 1198 } 1199 1200 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1201 { 1202 Error *local_err = NULL; 1203 QemuOptsList *opts_list; 1204 QemuOpts *opts; 1205 1206 opts_list = qemu_find_opts_err("netdev", &local_err); 1207 if (local_err) { 1208 goto out; 1209 } 1210 1211 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1212 if (local_err) { 1213 goto out; 1214 } 1215 1216 netdev_add(opts, &local_err); 1217 if (local_err) { 1218 qemu_opts_del(opts); 1219 goto out; 1220 } 1221 1222 out: 1223 error_propagate(errp, local_err); 1224 } 1225 1226 void qmp_netdev_del(const char *id, Error **errp) 1227 { 1228 NetClientState *nc; 1229 QemuOpts *opts; 1230 1231 nc = qemu_find_netdev(id); 1232 if (!nc) { 1233 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1234 "Device '%s' not found", id); 1235 return; 1236 } 1237 1238 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1239 if (!opts) { 1240 error_setg(errp, "Device '%s' is not a netdev", id); 1241 return; 1242 } 1243 1244 qemu_del_net_client(nc); 1245 qemu_opts_del(opts); 1246 } 1247 1248 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1249 { 1250 char *str; 1251 ObjectProperty *prop; 1252 ObjectPropertyIterator iter; 1253 Visitor *v; 1254 1255 /* generate info str */ 1256 object_property_iter_init(&iter, OBJECT(nf)); 1257 while ((prop = object_property_iter_next(&iter))) { 1258 if (!strcmp(prop->name, "type")) { 1259 continue; 1260 } 1261 v = string_output_visitor_new(false, &str); 1262 object_property_get(OBJECT(nf), v, prop->name, NULL); 1263 visit_complete(v, &str); 1264 visit_free(v); 1265 monitor_printf(mon, ",%s=%s", prop->name, str); 1266 g_free(str); 1267 } 1268 monitor_printf(mon, "\n"); 1269 } 1270 1271 void print_net_client(Monitor *mon, NetClientState *nc) 1272 { 1273 NetFilterState *nf; 1274 1275 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1276 nc->queue_index, 1277 NetClientDriver_lookup[nc->info->type], 1278 nc->info_str); 1279 if (!QTAILQ_EMPTY(&nc->filters)) { 1280 monitor_printf(mon, "filters:\n"); 1281 } 1282 QTAILQ_FOREACH(nf, &nc->filters, next) { 1283 char *path = object_get_canonical_path_component(OBJECT(nf)); 1284 1285 monitor_printf(mon, " - %s: type=%s", path, 1286 object_get_typename(OBJECT(nf))); 1287 netfilter_print_info(mon, nf); 1288 g_free(path); 1289 } 1290 } 1291 1292 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1293 Error **errp) 1294 { 1295 NetClientState *nc; 1296 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1297 1298 QTAILQ_FOREACH(nc, &net_clients, next) { 1299 RxFilterInfoList *entry; 1300 RxFilterInfo *info; 1301 1302 if (has_name && strcmp(nc->name, name) != 0) { 1303 continue; 1304 } 1305 1306 /* only query rx-filter information of NIC */ 1307 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1308 if (has_name) { 1309 error_setg(errp, "net client(%s) isn't a NIC", name); 1310 return NULL; 1311 } 1312 continue; 1313 } 1314 1315 /* only query information on queue 0 since the info is per nic, 1316 * not per queue 1317 */ 1318 if (nc->queue_index != 0) 1319 continue; 1320 1321 if (nc->info->query_rx_filter) { 1322 info = nc->info->query_rx_filter(nc); 1323 entry = g_malloc0(sizeof(*entry)); 1324 entry->value = info; 1325 1326 if (!filter_list) { 1327 filter_list = entry; 1328 } else { 1329 last_entry->next = entry; 1330 } 1331 last_entry = entry; 1332 } else if (has_name) { 1333 error_setg(errp, "net client(%s) doesn't support" 1334 " rx-filter querying", name); 1335 return NULL; 1336 } 1337 1338 if (has_name) { 1339 break; 1340 } 1341 } 1342 1343 if (filter_list == NULL && has_name) { 1344 error_setg(errp, "invalid net client name: %s", name); 1345 } 1346 1347 return filter_list; 1348 } 1349 1350 void hmp_info_network(Monitor *mon, const QDict *qdict) 1351 { 1352 NetClientState *nc, *peer; 1353 NetClientDriver type; 1354 1355 net_hub_info(mon); 1356 1357 QTAILQ_FOREACH(nc, &net_clients, next) { 1358 peer = nc->peer; 1359 type = nc->info->type; 1360 1361 /* Skip if already printed in hub info */ 1362 if (net_hub_id_for_client(nc, NULL) == 0) { 1363 continue; 1364 } 1365 1366 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1367 print_net_client(mon, nc); 1368 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1369 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1370 monitor_printf(mon, " \\ "); 1371 print_net_client(mon, peer); 1372 } 1373 } 1374 } 1375 1376 void qmp_set_link(const char *name, bool up, Error **errp) 1377 { 1378 NetClientState *ncs[MAX_QUEUE_NUM]; 1379 NetClientState *nc; 1380 int queues, i; 1381 1382 queues = qemu_find_net_clients_except(name, ncs, 1383 NET_CLIENT_DRIVER__MAX, 1384 MAX_QUEUE_NUM); 1385 1386 if (queues == 0) { 1387 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1388 "Device '%s' not found", name); 1389 return; 1390 } 1391 nc = ncs[0]; 1392 1393 for (i = 0; i < queues; i++) { 1394 ncs[i]->link_down = !up; 1395 } 1396 1397 if (nc->info->link_status_changed) { 1398 nc->info->link_status_changed(nc); 1399 } 1400 1401 if (nc->peer) { 1402 /* Change peer link only if the peer is NIC and then notify peer. 1403 * If the peer is a HUBPORT or a backend, we do not change the 1404 * link status. 1405 * 1406 * This behavior is compatible with qemu vlans where there could be 1407 * multiple clients that can still communicate with each other in 1408 * disconnected mode. For now maintain this compatibility. 1409 */ 1410 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1411 for (i = 0; i < queues; i++) { 1412 ncs[i]->peer->link_down = !up; 1413 } 1414 } 1415 if (nc->peer->info->link_status_changed) { 1416 nc->peer->info->link_status_changed(nc->peer); 1417 } 1418 } 1419 } 1420 1421 static void net_vm_change_state_handler(void *opaque, int running, 1422 RunState state) 1423 { 1424 NetClientState *nc; 1425 NetClientState *tmp; 1426 1427 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1428 if (running) { 1429 /* Flush queued packets and wake up backends. */ 1430 if (nc->peer && qemu_can_send_packet(nc)) { 1431 qemu_flush_queued_packets(nc->peer); 1432 } 1433 } else { 1434 /* Complete all queued packets, to guarantee we don't modify 1435 * state later when VM is not running. 1436 */ 1437 qemu_flush_or_purge_queued_packets(nc, true); 1438 } 1439 } 1440 } 1441 1442 void net_cleanup(void) 1443 { 1444 NetClientState *nc; 1445 1446 /* We may del multiple entries during qemu_del_net_client(), 1447 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1448 */ 1449 while (!QTAILQ_EMPTY(&net_clients)) { 1450 nc = QTAILQ_FIRST(&net_clients); 1451 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1452 qemu_del_nic(qemu_get_nic(nc)); 1453 } else { 1454 qemu_del_net_client(nc); 1455 } 1456 } 1457 1458 qemu_del_vm_change_state_handler(net_change_state_entry); 1459 } 1460 1461 void net_check_clients(void) 1462 { 1463 NetClientState *nc; 1464 int i; 1465 1466 net_hub_check_clients(); 1467 1468 QTAILQ_FOREACH(nc, &net_clients, next) { 1469 if (!nc->peer) { 1470 fprintf(stderr, "Warning: %s %s has no peer\n", 1471 nc->info->type == NET_CLIENT_DRIVER_NIC ? 1472 "nic" : "netdev", nc->name); 1473 } 1474 } 1475 1476 /* Check that all NICs requested via -net nic actually got created. 1477 * NICs created via -device don't need to be checked here because 1478 * they are always instantiated. 1479 */ 1480 for (i = 0; i < MAX_NICS; i++) { 1481 NICInfo *nd = &nd_table[i]; 1482 if (nd->used && !nd->instantiated) { 1483 fprintf(stderr, "Warning: requested NIC (%s, model %s) " 1484 "was not created (not supported by this machine?)\n", 1485 nd->name ? nd->name : "anonymous", 1486 nd->model ? nd->model : "unspecified"); 1487 } 1488 } 1489 } 1490 1491 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1492 { 1493 Error *local_err = NULL; 1494 1495 net_client_init(opts, false, &local_err); 1496 if (local_err) { 1497 error_report_err(local_err); 1498 return -1; 1499 } 1500 1501 return 0; 1502 } 1503 1504 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1505 { 1506 Error *local_err = NULL; 1507 int ret; 1508 1509 ret = net_client_init(opts, true, &local_err); 1510 if (local_err) { 1511 error_report_err(local_err); 1512 return -1; 1513 } 1514 1515 return ret; 1516 } 1517 1518 int net_init_clients(void) 1519 { 1520 QemuOptsList *net = qemu_find_opts("net"); 1521 1522 net_change_state_entry = 1523 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1524 1525 QTAILQ_INIT(&net_clients); 1526 1527 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1528 net_init_netdev, NULL, NULL)) { 1529 return -1; 1530 } 1531 1532 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) { 1533 return -1; 1534 } 1535 1536 return 0; 1537 } 1538 1539 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1540 { 1541 #if defined(CONFIG_SLIRP) 1542 int ret; 1543 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) { 1544 return ret; 1545 } 1546 #endif 1547 1548 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1549 return -1; 1550 } 1551 1552 return 0; 1553 } 1554 1555 /* From FreeBSD */ 1556 /* XXX: optimize */ 1557 unsigned compute_mcast_idx(const uint8_t *ep) 1558 { 1559 uint32_t crc; 1560 int carry, i, j; 1561 uint8_t b; 1562 1563 crc = 0xffffffff; 1564 for (i = 0; i < 6; i++) { 1565 b = *ep++; 1566 for (j = 0; j < 8; j++) { 1567 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1568 crc <<= 1; 1569 b >>= 1; 1570 if (carry) { 1571 crc = ((crc ^ POLYNOMIAL) | carry); 1572 } 1573 } 1574 } 1575 return crc >> 26; 1576 } 1577 1578 QemuOptsList qemu_netdev_opts = { 1579 .name = "netdev", 1580 .implied_opt_name = "type", 1581 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1582 .desc = { 1583 /* 1584 * no elements => accept any params 1585 * validation will happen later 1586 */ 1587 { /* end of list */ } 1588 }, 1589 }; 1590 1591 QemuOptsList qemu_net_opts = { 1592 .name = "net", 1593 .implied_opt_name = "type", 1594 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1595 .desc = { 1596 /* 1597 * no elements => accept any params 1598 * validation will happen later 1599 */ 1600 { /* end of list */ } 1601 }, 1602 }; 1603 1604 void net_socket_rs_init(SocketReadState *rs, 1605 SocketReadStateFinalize *finalize) 1606 { 1607 rs->state = 0; 1608 rs->index = 0; 1609 rs->packet_len = 0; 1610 memset(rs->buf, 0, sizeof(rs->buf)); 1611 rs->finalize = finalize; 1612 } 1613 1614 /* 1615 * Returns 1616 * 0: success 1617 * -1: error occurs 1618 */ 1619 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1620 { 1621 unsigned int l; 1622 1623 while (size > 0) { 1624 /* reassemble a packet from the network */ 1625 switch (rs->state) { /* 0 = getting length, 1 = getting data */ 1626 case 0: 1627 l = 4 - rs->index; 1628 if (l > size) { 1629 l = size; 1630 } 1631 memcpy(rs->buf + rs->index, buf, l); 1632 buf += l; 1633 size -= l; 1634 rs->index += l; 1635 if (rs->index == 4) { 1636 /* got length */ 1637 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1638 rs->index = 0; 1639 rs->state = 1; 1640 } 1641 break; 1642 case 1: 1643 l = rs->packet_len - rs->index; 1644 if (l > size) { 1645 l = size; 1646 } 1647 if (rs->index + l <= sizeof(rs->buf)) { 1648 memcpy(rs->buf + rs->index, buf, l); 1649 } else { 1650 fprintf(stderr, "serious error: oversized packet received," 1651 "connection terminated.\n"); 1652 rs->index = rs->state = 0; 1653 return -1; 1654 } 1655 1656 rs->index += l; 1657 buf += l; 1658 size -= l; 1659 if (rs->index >= rs->packet_len) { 1660 rs->index = 0; 1661 rs->state = 0; 1662 assert(rs->finalize); 1663 rs->finalize(rs); 1664 } 1665 break; 1666 } 1667 } 1668 1669 assert(size == 0); 1670 return 0; 1671 } 1672