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 "sysemu/qtest.h" 49 #include "net/filter.h" 50 #include "qapi/string-output-visitor.h" 51 52 /* Net bridge is currently not supported for W32. */ 53 #if !defined(_WIN32) 54 # define CONFIG_NET_BRIDGE 55 #endif 56 57 static VMChangeStateEntry *net_change_state_entry; 58 static QTAILQ_HEAD(, NetClientState) net_clients; 59 60 const char *host_net_devices[] = { 61 "tap", 62 "socket", 63 "dump", 64 #ifdef CONFIG_NET_BRIDGE 65 "bridge", 66 #endif 67 #ifdef CONFIG_NETMAP 68 "netmap", 69 #endif 70 #ifdef CONFIG_SLIRP 71 "user", 72 #endif 73 #ifdef CONFIG_VDE 74 "vde", 75 #endif 76 "vhost-user", 77 NULL, 78 }; 79 80 /***********************************************************/ 81 /* network device redirectors */ 82 83 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 84 { 85 const char *p, *p1; 86 int len; 87 p = *pp; 88 p1 = strchr(p, sep); 89 if (!p1) 90 return -1; 91 len = p1 - p; 92 p1++; 93 if (buf_size > 0) { 94 if (len > buf_size - 1) 95 len = buf_size - 1; 96 memcpy(buf, p, len); 97 buf[len] = '\0'; 98 } 99 *pp = p1; 100 return 0; 101 } 102 103 int parse_host_port(struct sockaddr_in *saddr, const char *str) 104 { 105 char buf[512]; 106 struct hostent *he; 107 const char *p, *r; 108 int port; 109 110 p = str; 111 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) 112 return -1; 113 saddr->sin_family = AF_INET; 114 if (buf[0] == '\0') { 115 saddr->sin_addr.s_addr = 0; 116 } else { 117 if (qemu_isdigit(buf[0])) { 118 if (!inet_aton(buf, &saddr->sin_addr)) 119 return -1; 120 } else { 121 if ((he = gethostbyname(buf)) == NULL) 122 return - 1; 123 saddr->sin_addr = *(struct in_addr *)he->h_addr; 124 } 125 } 126 port = strtol(p, (char **)&r, 0); 127 if (r == p) 128 return -1; 129 saddr->sin_port = htons(port); 130 return 0; 131 } 132 133 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 134 { 135 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 136 macaddr[0], macaddr[1], macaddr[2], 137 macaddr[3], macaddr[4], macaddr[5]); 138 } 139 140 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 141 { 142 snprintf(nc->info_str, sizeof(nc->info_str), 143 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 144 nc->model, 145 macaddr[0], macaddr[1], macaddr[2], 146 macaddr[3], macaddr[4], macaddr[5]); 147 } 148 149 static int mac_table[256] = {0}; 150 151 static void qemu_macaddr_set_used(MACAddr *macaddr) 152 { 153 int index; 154 155 for (index = 0x56; index < 0xFF; index++) { 156 if (macaddr->a[5] == index) { 157 mac_table[index]++; 158 } 159 } 160 } 161 162 static void qemu_macaddr_set_free(MACAddr *macaddr) 163 { 164 int index; 165 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 166 167 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 168 return; 169 } 170 for (index = 0x56; index < 0xFF; index++) { 171 if (macaddr->a[5] == index) { 172 mac_table[index]--; 173 } 174 } 175 } 176 177 static int qemu_macaddr_get_free(void) 178 { 179 int index; 180 181 for (index = 0x56; index < 0xFF; index++) { 182 if (mac_table[index] == 0) { 183 return index; 184 } 185 } 186 187 return -1; 188 } 189 190 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 191 { 192 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 193 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 194 195 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 196 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 197 return; 198 } else { 199 qemu_macaddr_set_used(macaddr); 200 return; 201 } 202 } 203 204 macaddr->a[0] = 0x52; 205 macaddr->a[1] = 0x54; 206 macaddr->a[2] = 0x00; 207 macaddr->a[3] = 0x12; 208 macaddr->a[4] = 0x34; 209 macaddr->a[5] = qemu_macaddr_get_free(); 210 qemu_macaddr_set_used(macaddr); 211 } 212 213 /** 214 * Generate a name for net client 215 * 216 * Only net clients created with the legacy -net option and NICs need this. 217 */ 218 static char *assign_name(NetClientState *nc1, const char *model) 219 { 220 NetClientState *nc; 221 int id = 0; 222 223 QTAILQ_FOREACH(nc, &net_clients, next) { 224 if (nc == nc1) { 225 continue; 226 } 227 if (strcmp(nc->model, model) == 0) { 228 id++; 229 } 230 } 231 232 return g_strdup_printf("%s.%d", model, id); 233 } 234 235 static void qemu_net_client_destructor(NetClientState *nc) 236 { 237 g_free(nc); 238 } 239 240 static void qemu_net_client_setup(NetClientState *nc, 241 NetClientInfo *info, 242 NetClientState *peer, 243 const char *model, 244 const char *name, 245 NetClientDestructor *destructor) 246 { 247 nc->info = info; 248 nc->model = g_strdup(model); 249 if (name) { 250 nc->name = g_strdup(name); 251 } else { 252 nc->name = assign_name(nc, model); 253 } 254 255 if (peer) { 256 assert(!peer->peer); 257 nc->peer = peer; 258 peer->peer = nc; 259 } 260 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 261 262 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 263 nc->destructor = destructor; 264 QTAILQ_INIT(&nc->filters); 265 } 266 267 NetClientState *qemu_new_net_client(NetClientInfo *info, 268 NetClientState *peer, 269 const char *model, 270 const char *name) 271 { 272 NetClientState *nc; 273 274 assert(info->size >= sizeof(NetClientState)); 275 276 nc = g_malloc0(info->size); 277 qemu_net_client_setup(nc, info, peer, model, name, 278 qemu_net_client_destructor); 279 280 return nc; 281 } 282 283 NICState *qemu_new_nic(NetClientInfo *info, 284 NICConf *conf, 285 const char *model, 286 const char *name, 287 void *opaque) 288 { 289 NetClientState **peers = conf->peers.ncs; 290 NICState *nic; 291 int i, queues = MAX(1, conf->peers.queues); 292 293 assert(info->type == NET_CLIENT_DRIVER_NIC); 294 assert(info->size >= sizeof(NICState)); 295 296 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 297 nic->ncs = (void *)nic + info->size; 298 nic->conf = conf; 299 nic->opaque = opaque; 300 301 for (i = 0; i < queues; i++) { 302 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 303 NULL); 304 nic->ncs[i].queue_index = i; 305 } 306 307 return nic; 308 } 309 310 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 311 { 312 return nic->ncs + queue_index; 313 } 314 315 NetClientState *qemu_get_queue(NICState *nic) 316 { 317 return qemu_get_subqueue(nic, 0); 318 } 319 320 NICState *qemu_get_nic(NetClientState *nc) 321 { 322 NetClientState *nc0 = nc - nc->queue_index; 323 324 return (NICState *)((void *)nc0 - nc->info->size); 325 } 326 327 void *qemu_get_nic_opaque(NetClientState *nc) 328 { 329 NICState *nic = qemu_get_nic(nc); 330 331 return nic->opaque; 332 } 333 334 static void qemu_cleanup_net_client(NetClientState *nc) 335 { 336 QTAILQ_REMOVE(&net_clients, nc, next); 337 338 if (nc->info->cleanup) { 339 nc->info->cleanup(nc); 340 } 341 } 342 343 static void qemu_free_net_client(NetClientState *nc) 344 { 345 if (nc->incoming_queue) { 346 qemu_del_net_queue(nc->incoming_queue); 347 } 348 if (nc->peer) { 349 nc->peer->peer = NULL; 350 } 351 g_free(nc->name); 352 g_free(nc->model); 353 if (nc->destructor) { 354 nc->destructor(nc); 355 } 356 } 357 358 void qemu_del_net_client(NetClientState *nc) 359 { 360 NetClientState *ncs[MAX_QUEUE_NUM]; 361 int queues, i; 362 NetFilterState *nf, *next; 363 364 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 365 366 /* If the NetClientState belongs to a multiqueue backend, we will change all 367 * other NetClientStates also. 368 */ 369 queues = qemu_find_net_clients_except(nc->name, ncs, 370 NET_CLIENT_DRIVER_NIC, 371 MAX_QUEUE_NUM); 372 assert(queues != 0); 373 374 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 375 object_unparent(OBJECT(nf)); 376 } 377 378 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 379 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 380 NICState *nic = qemu_get_nic(nc->peer); 381 if (nic->peer_deleted) { 382 return; 383 } 384 nic->peer_deleted = true; 385 386 for (i = 0; i < queues; i++) { 387 ncs[i]->peer->link_down = true; 388 } 389 390 if (nc->peer->info->link_status_changed) { 391 nc->peer->info->link_status_changed(nc->peer); 392 } 393 394 for (i = 0; i < queues; i++) { 395 qemu_cleanup_net_client(ncs[i]); 396 } 397 398 return; 399 } 400 401 for (i = 0; i < queues; i++) { 402 qemu_cleanup_net_client(ncs[i]); 403 qemu_free_net_client(ncs[i]); 404 } 405 } 406 407 void qemu_del_nic(NICState *nic) 408 { 409 int i, queues = MAX(nic->conf->peers.queues, 1); 410 411 qemu_macaddr_set_free(&nic->conf->macaddr); 412 413 /* If this is a peer NIC and peer has already been deleted, free it now. */ 414 if (nic->peer_deleted) { 415 for (i = 0; i < queues; i++) { 416 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 417 } 418 } 419 420 for (i = queues - 1; i >= 0; i--) { 421 NetClientState *nc = qemu_get_subqueue(nic, i); 422 423 qemu_cleanup_net_client(nc); 424 qemu_free_net_client(nc); 425 } 426 427 g_free(nic); 428 } 429 430 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 431 { 432 NetClientState *nc; 433 434 QTAILQ_FOREACH(nc, &net_clients, next) { 435 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 436 if (nc->queue_index == 0) { 437 func(qemu_get_nic(nc), opaque); 438 } 439 } 440 } 441 } 442 443 bool qemu_has_ufo(NetClientState *nc) 444 { 445 if (!nc || !nc->info->has_ufo) { 446 return false; 447 } 448 449 return nc->info->has_ufo(nc); 450 } 451 452 bool qemu_has_vnet_hdr(NetClientState *nc) 453 { 454 if (!nc || !nc->info->has_vnet_hdr) { 455 return false; 456 } 457 458 return nc->info->has_vnet_hdr(nc); 459 } 460 461 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 462 { 463 if (!nc || !nc->info->has_vnet_hdr_len) { 464 return false; 465 } 466 467 return nc->info->has_vnet_hdr_len(nc, len); 468 } 469 470 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 471 { 472 if (!nc || !nc->info->using_vnet_hdr) { 473 return; 474 } 475 476 nc->info->using_vnet_hdr(nc, enable); 477 } 478 479 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 480 int ecn, int ufo) 481 { 482 if (!nc || !nc->info->set_offload) { 483 return; 484 } 485 486 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 487 } 488 489 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 490 { 491 if (!nc || !nc->info->set_vnet_hdr_len) { 492 return; 493 } 494 495 nc->vnet_hdr_len = len; 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_DRIVER_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 offset = iov_size(iov, iovcnt); 696 if (offset > NET_BUFSIZE) { 697 return -1; 698 } 699 buf = g_malloc(offset); 700 buffer = buf; 701 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 702 } 703 704 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 705 ret = nc->info->receive_raw(nc, buffer, offset); 706 } else { 707 ret = nc->info->receive(nc, buffer, offset); 708 } 709 710 g_free(buf); 711 return ret; 712 } 713 714 ssize_t qemu_deliver_packet_iov(NetClientState *sender, 715 unsigned flags, 716 const struct iovec *iov, 717 int iovcnt, 718 void *opaque) 719 { 720 NetClientState *nc = opaque; 721 int ret; 722 723 if (nc->link_down) { 724 return iov_size(iov, iovcnt); 725 } 726 727 if (nc->receive_disabled) { 728 return 0; 729 } 730 731 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 732 ret = nc->info->receive_iov(nc, iov, iovcnt); 733 } else { 734 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 735 } 736 737 if (ret == 0) { 738 nc->receive_disabled = 1; 739 } 740 741 return ret; 742 } 743 744 ssize_t qemu_sendv_packet_async(NetClientState *sender, 745 const struct iovec *iov, int iovcnt, 746 NetPacketSent *sent_cb) 747 { 748 NetQueue *queue; 749 int ret; 750 751 if (sender->link_down || !sender->peer) { 752 return iov_size(iov, iovcnt); 753 } 754 755 /* Let filters handle the packet first */ 756 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 757 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 758 if (ret) { 759 return ret; 760 } 761 762 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 763 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 764 if (ret) { 765 return ret; 766 } 767 768 queue = sender->peer->incoming_queue; 769 770 return qemu_net_queue_send_iov(queue, sender, 771 QEMU_NET_PACKET_FLAG_NONE, 772 iov, iovcnt, sent_cb); 773 } 774 775 ssize_t 776 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 777 { 778 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 779 } 780 781 NetClientState *qemu_find_netdev(const char *id) 782 { 783 NetClientState *nc; 784 785 QTAILQ_FOREACH(nc, &net_clients, next) { 786 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 787 continue; 788 if (!strcmp(nc->name, id)) { 789 return nc; 790 } 791 } 792 793 return NULL; 794 } 795 796 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 797 NetClientDriver type, int max) 798 { 799 NetClientState *nc; 800 int ret = 0; 801 802 QTAILQ_FOREACH(nc, &net_clients, next) { 803 if (nc->info->type == type) { 804 continue; 805 } 806 if (!id || !strcmp(nc->name, id)) { 807 if (ret < max) { 808 ncs[ret] = nc; 809 } 810 ret++; 811 } 812 } 813 814 return ret; 815 } 816 817 static int nic_get_free_idx(void) 818 { 819 int index; 820 821 for (index = 0; index < MAX_NICS; index++) 822 if (!nd_table[index].used) 823 return index; 824 return -1; 825 } 826 827 int qemu_show_nic_models(const char *arg, const char *const *models) 828 { 829 int i; 830 831 if (!arg || !is_help_option(arg)) { 832 return 0; 833 } 834 835 fprintf(stderr, "qemu: Supported NIC models: "); 836 for (i = 0 ; models[i]; i++) 837 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); 838 return 1; 839 } 840 841 void qemu_check_nic_model(NICInfo *nd, const char *model) 842 { 843 const char *models[2]; 844 845 models[0] = model; 846 models[1] = NULL; 847 848 if (qemu_show_nic_models(nd->model, models)) 849 exit(0); 850 if (qemu_find_nic_model(nd, models, model) < 0) 851 exit(1); 852 } 853 854 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 855 const char *default_model) 856 { 857 int i; 858 859 if (!nd->model) 860 nd->model = g_strdup(default_model); 861 862 for (i = 0 ; models[i]; i++) { 863 if (strcmp(nd->model, models[i]) == 0) 864 return i; 865 } 866 867 error_report("Unsupported NIC model: %s", nd->model); 868 return -1; 869 } 870 871 static int net_init_nic(const Netdev *netdev, const char *name, 872 NetClientState *peer, Error **errp) 873 { 874 int idx; 875 NICInfo *nd; 876 const NetLegacyNicOptions *nic; 877 878 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 879 nic = &netdev->u.nic; 880 881 idx = nic_get_free_idx(); 882 if (idx == -1 || nb_nics >= MAX_NICS) { 883 error_setg(errp, "too many NICs"); 884 return -1; 885 } 886 887 nd = &nd_table[idx]; 888 889 memset(nd, 0, sizeof(*nd)); 890 891 if (nic->has_netdev) { 892 nd->netdev = qemu_find_netdev(nic->netdev); 893 if (!nd->netdev) { 894 error_setg(errp, "netdev '%s' not found", nic->netdev); 895 return -1; 896 } 897 } else { 898 assert(peer); 899 nd->netdev = peer; 900 } 901 nd->name = g_strdup(name); 902 if (nic->has_model) { 903 nd->model = g_strdup(nic->model); 904 } 905 if (nic->has_addr) { 906 nd->devaddr = g_strdup(nic->addr); 907 } 908 909 if (nic->has_macaddr && 910 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 911 error_setg(errp, "invalid syntax for ethernet address"); 912 return -1; 913 } 914 if (nic->has_macaddr && 915 is_multicast_ether_addr(nd->macaddr.a)) { 916 error_setg(errp, 917 "NIC cannot have multicast MAC address (odd 1st byte)"); 918 return -1; 919 } 920 qemu_macaddr_default_if_unset(&nd->macaddr); 921 922 if (nic->has_vectors) { 923 if (nic->vectors > 0x7ffffff) { 924 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 925 return -1; 926 } 927 nd->nvectors = nic->vectors; 928 } else { 929 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 930 } 931 932 nd->used = 1; 933 nb_nics++; 934 935 return idx; 936 } 937 938 939 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 940 const Netdev *netdev, 941 const char *name, 942 NetClientState *peer, Error **errp) = { 943 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 944 #ifdef CONFIG_SLIRP 945 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 946 #endif 947 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 948 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 949 #ifdef CONFIG_VDE 950 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 951 #endif 952 #ifdef CONFIG_NETMAP 953 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 954 #endif 955 [NET_CLIENT_DRIVER_DUMP] = net_init_dump, 956 #ifdef CONFIG_NET_BRIDGE 957 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 958 #endif 959 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 960 #ifdef CONFIG_VHOST_NET_USED 961 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 962 #endif 963 #ifdef CONFIG_L2TPV3 964 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 965 #endif 966 }; 967 968 969 static int net_client_init1(const void *object, bool is_netdev, Error **errp) 970 { 971 Netdev legacy = {0}; 972 const Netdev *netdev; 973 const char *name; 974 NetClientState *peer = NULL; 975 static bool vlan_warned; 976 977 if (is_netdev) { 978 netdev = object; 979 name = netdev->id; 980 981 if (netdev->type == NET_CLIENT_DRIVER_DUMP || 982 netdev->type == NET_CLIENT_DRIVER_NIC || 983 !net_client_init_fun[netdev->type]) { 984 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 985 "a netdev backend type"); 986 return -1; 987 } 988 } else { 989 const NetLegacy *net = object; 990 const NetLegacyOptions *opts = net->opts; 991 legacy.id = net->id; 992 netdev = &legacy; 993 /* missing optional values have been initialized to "all bits zero" */ 994 name = net->has_id ? net->id : net->name; 995 996 /* Map the old options to the new flat type */ 997 switch (opts->type) { 998 case NET_LEGACY_OPTIONS_TYPE_NONE: 999 return 0; /* nothing to do */ 1000 case NET_LEGACY_OPTIONS_TYPE_NIC: 1001 legacy.type = NET_CLIENT_DRIVER_NIC; 1002 legacy.u.nic = opts->u.nic; 1003 break; 1004 case NET_LEGACY_OPTIONS_TYPE_USER: 1005 legacy.type = NET_CLIENT_DRIVER_USER; 1006 legacy.u.user = opts->u.user; 1007 break; 1008 case NET_LEGACY_OPTIONS_TYPE_TAP: 1009 legacy.type = NET_CLIENT_DRIVER_TAP; 1010 legacy.u.tap = opts->u.tap; 1011 break; 1012 case NET_LEGACY_OPTIONS_TYPE_L2TPV3: 1013 legacy.type = NET_CLIENT_DRIVER_L2TPV3; 1014 legacy.u.l2tpv3 = opts->u.l2tpv3; 1015 break; 1016 case NET_LEGACY_OPTIONS_TYPE_SOCKET: 1017 legacy.type = NET_CLIENT_DRIVER_SOCKET; 1018 legacy.u.socket = opts->u.socket; 1019 break; 1020 case NET_LEGACY_OPTIONS_TYPE_VDE: 1021 legacy.type = NET_CLIENT_DRIVER_VDE; 1022 legacy.u.vde = opts->u.vde; 1023 break; 1024 case NET_LEGACY_OPTIONS_TYPE_DUMP: 1025 legacy.type = NET_CLIENT_DRIVER_DUMP; 1026 legacy.u.dump = opts->u.dump; 1027 break; 1028 case NET_LEGACY_OPTIONS_TYPE_BRIDGE: 1029 legacy.type = NET_CLIENT_DRIVER_BRIDGE; 1030 legacy.u.bridge = opts->u.bridge; 1031 break; 1032 case NET_LEGACY_OPTIONS_TYPE_NETMAP: 1033 legacy.type = NET_CLIENT_DRIVER_NETMAP; 1034 legacy.u.netmap = opts->u.netmap; 1035 break; 1036 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER: 1037 legacy.type = NET_CLIENT_DRIVER_VHOST_USER; 1038 legacy.u.vhost_user = opts->u.vhost_user; 1039 break; 1040 default: 1041 abort(); 1042 } 1043 1044 if (!net_client_init_fun[netdev->type]) { 1045 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1046 "a net backend type (maybe it is not compiled " 1047 "into this binary)"); 1048 return -1; 1049 } 1050 1051 /* Do not add to a vlan if it's a nic with a netdev= parameter. */ 1052 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1053 !opts->u.nic.has_netdev) { 1054 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL); 1055 } 1056 1057 if (net->has_vlan && !vlan_warned) { 1058 error_report("'vlan' is deprecated. Please use 'netdev' instead."); 1059 vlan_warned = true; 1060 } 1061 } 1062 1063 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) { 1064 /* FIXME drop when all init functions store an Error */ 1065 if (errp && !*errp) { 1066 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1067 NetClientDriver_lookup[netdev->type]); 1068 } 1069 return -1; 1070 } 1071 return 0; 1072 } 1073 1074 1075 int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1076 { 1077 void *object = NULL; 1078 Error *err = NULL; 1079 int ret = -1; 1080 Visitor *v = opts_visitor_new(opts); 1081 1082 { 1083 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1084 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1085 1086 if (ip6_net) { 1087 char buf[strlen(ip6_net) + 1]; 1088 1089 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) { 1090 /* Default 64bit prefix length. */ 1091 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort); 1092 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort); 1093 } else { 1094 /* User-specified prefix length. */ 1095 unsigned long len; 1096 int err; 1097 1098 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort); 1099 err = qemu_strtoul(ip6_net, NULL, 10, &len); 1100 1101 if (err) { 1102 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1103 "ipv6-prefix", "a number"); 1104 } else { 1105 qemu_opt_set_number(opts, "ipv6-prefixlen", len, 1106 &error_abort); 1107 } 1108 } 1109 qemu_opt_unset(opts, "ipv6-net"); 1110 } 1111 } 1112 1113 if (is_netdev) { 1114 visit_type_Netdev(v, NULL, (Netdev **)&object, &err); 1115 } else { 1116 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err); 1117 } 1118 1119 if (!err) { 1120 ret = net_client_init1(object, is_netdev, &err); 1121 } 1122 1123 if (is_netdev) { 1124 qapi_free_Netdev(object); 1125 } else { 1126 qapi_free_NetLegacy(object); 1127 } 1128 1129 error_propagate(errp, err); 1130 visit_free(v); 1131 return ret; 1132 } 1133 1134 1135 static int net_host_check_device(const char *device) 1136 { 1137 int i; 1138 for (i = 0; host_net_devices[i]; i++) { 1139 if (!strncmp(host_net_devices[i], device, 1140 strlen(host_net_devices[i]))) { 1141 return 1; 1142 } 1143 } 1144 1145 return 0; 1146 } 1147 1148 void hmp_host_net_add(Monitor *mon, const QDict *qdict) 1149 { 1150 const char *device = qdict_get_str(qdict, "device"); 1151 const char *opts_str = qdict_get_try_str(qdict, "opts"); 1152 Error *local_err = NULL; 1153 QemuOpts *opts; 1154 static bool warned; 1155 1156 if (!warned && !qtest_enabled()) { 1157 error_report("host_net_add is deprecated, use netdev_add instead"); 1158 warned = true; 1159 } 1160 1161 if (!net_host_check_device(device)) { 1162 monitor_printf(mon, "invalid host network device %s\n", device); 1163 return; 1164 } 1165 1166 opts = qemu_opts_parse_noisily(qemu_find_opts("net"), 1167 opts_str ? opts_str : "", false); 1168 if (!opts) { 1169 return; 1170 } 1171 1172 qemu_opt_set(opts, "type", device, &error_abort); 1173 1174 net_client_init(opts, false, &local_err); 1175 if (local_err) { 1176 error_report_err(local_err); 1177 monitor_printf(mon, "adding host network device %s failed\n", device); 1178 } 1179 } 1180 1181 void hmp_host_net_remove(Monitor *mon, const QDict *qdict) 1182 { 1183 NetClientState *nc; 1184 int vlan_id = qdict_get_int(qdict, "vlan_id"); 1185 const char *device = qdict_get_str(qdict, "device"); 1186 static bool warned; 1187 1188 if (!warned && !qtest_enabled()) { 1189 error_report("host_net_remove is deprecated, use netdev_del instead"); 1190 warned = true; 1191 } 1192 1193 nc = net_hub_find_client_by_name(vlan_id, device); 1194 if (!nc) { 1195 error_report("Host network device '%s' on hub '%d' not found", 1196 device, vlan_id); 1197 return; 1198 } 1199 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1200 error_report("invalid host network device '%s'", device); 1201 return; 1202 } 1203 1204 qemu_del_net_client(nc->peer); 1205 qemu_del_net_client(nc); 1206 qemu_opts_del(qemu_opts_find(qemu_find_opts("net"), device)); 1207 } 1208 1209 void netdev_add(QemuOpts *opts, Error **errp) 1210 { 1211 net_client_init(opts, true, errp); 1212 } 1213 1214 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1215 { 1216 Error *local_err = NULL; 1217 QemuOptsList *opts_list; 1218 QemuOpts *opts; 1219 1220 opts_list = qemu_find_opts_err("netdev", &local_err); 1221 if (local_err) { 1222 goto out; 1223 } 1224 1225 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1226 if (local_err) { 1227 goto out; 1228 } 1229 1230 netdev_add(opts, &local_err); 1231 if (local_err) { 1232 qemu_opts_del(opts); 1233 goto out; 1234 } 1235 1236 out: 1237 error_propagate(errp, local_err); 1238 } 1239 1240 void qmp_netdev_del(const char *id, Error **errp) 1241 { 1242 NetClientState *nc; 1243 QemuOpts *opts; 1244 1245 nc = qemu_find_netdev(id); 1246 if (!nc) { 1247 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1248 "Device '%s' not found", id); 1249 return; 1250 } 1251 1252 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1253 if (!opts) { 1254 error_setg(errp, "Device '%s' is not a netdev", id); 1255 return; 1256 } 1257 1258 qemu_del_net_client(nc); 1259 qemu_opts_del(opts); 1260 } 1261 1262 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1263 { 1264 char *str; 1265 ObjectProperty *prop; 1266 ObjectPropertyIterator iter; 1267 Visitor *v; 1268 1269 /* generate info str */ 1270 object_property_iter_init(&iter, OBJECT(nf)); 1271 while ((prop = object_property_iter_next(&iter))) { 1272 if (!strcmp(prop->name, "type")) { 1273 continue; 1274 } 1275 v = string_output_visitor_new(false, &str); 1276 object_property_get(OBJECT(nf), v, prop->name, NULL); 1277 visit_complete(v, &str); 1278 visit_free(v); 1279 monitor_printf(mon, ",%s=%s", prop->name, str); 1280 g_free(str); 1281 } 1282 monitor_printf(mon, "\n"); 1283 } 1284 1285 void print_net_client(Monitor *mon, NetClientState *nc) 1286 { 1287 NetFilterState *nf; 1288 1289 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1290 nc->queue_index, 1291 NetClientDriver_lookup[nc->info->type], 1292 nc->info_str); 1293 if (!QTAILQ_EMPTY(&nc->filters)) { 1294 monitor_printf(mon, "filters:\n"); 1295 } 1296 QTAILQ_FOREACH(nf, &nc->filters, next) { 1297 char *path = object_get_canonical_path_component(OBJECT(nf)); 1298 1299 monitor_printf(mon, " - %s: type=%s", path, 1300 object_get_typename(OBJECT(nf))); 1301 netfilter_print_info(mon, nf); 1302 g_free(path); 1303 } 1304 } 1305 1306 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1307 Error **errp) 1308 { 1309 NetClientState *nc; 1310 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1311 1312 QTAILQ_FOREACH(nc, &net_clients, next) { 1313 RxFilterInfoList *entry; 1314 RxFilterInfo *info; 1315 1316 if (has_name && strcmp(nc->name, name) != 0) { 1317 continue; 1318 } 1319 1320 /* only query rx-filter information of NIC */ 1321 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1322 if (has_name) { 1323 error_setg(errp, "net client(%s) isn't a NIC", name); 1324 return NULL; 1325 } 1326 continue; 1327 } 1328 1329 /* only query information on queue 0 since the info is per nic, 1330 * not per queue 1331 */ 1332 if (nc->queue_index != 0) 1333 continue; 1334 1335 if (nc->info->query_rx_filter) { 1336 info = nc->info->query_rx_filter(nc); 1337 entry = g_malloc0(sizeof(*entry)); 1338 entry->value = info; 1339 1340 if (!filter_list) { 1341 filter_list = entry; 1342 } else { 1343 last_entry->next = entry; 1344 } 1345 last_entry = entry; 1346 } else if (has_name) { 1347 error_setg(errp, "net client(%s) doesn't support" 1348 " rx-filter querying", name); 1349 return NULL; 1350 } 1351 1352 if (has_name) { 1353 break; 1354 } 1355 } 1356 1357 if (filter_list == NULL && has_name) { 1358 error_setg(errp, "invalid net client name: %s", name); 1359 } 1360 1361 return filter_list; 1362 } 1363 1364 void hmp_info_network(Monitor *mon, const QDict *qdict) 1365 { 1366 NetClientState *nc, *peer; 1367 NetClientDriver type; 1368 1369 net_hub_info(mon); 1370 1371 QTAILQ_FOREACH(nc, &net_clients, next) { 1372 peer = nc->peer; 1373 type = nc->info->type; 1374 1375 /* Skip if already printed in hub info */ 1376 if (net_hub_id_for_client(nc, NULL) == 0) { 1377 continue; 1378 } 1379 1380 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1381 print_net_client(mon, nc); 1382 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1383 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1384 monitor_printf(mon, " \\ "); 1385 print_net_client(mon, peer); 1386 } 1387 } 1388 } 1389 1390 void qmp_set_link(const char *name, bool up, Error **errp) 1391 { 1392 NetClientState *ncs[MAX_QUEUE_NUM]; 1393 NetClientState *nc; 1394 int queues, i; 1395 1396 queues = qemu_find_net_clients_except(name, ncs, 1397 NET_CLIENT_DRIVER__MAX, 1398 MAX_QUEUE_NUM); 1399 1400 if (queues == 0) { 1401 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1402 "Device '%s' not found", name); 1403 return; 1404 } 1405 nc = ncs[0]; 1406 1407 for (i = 0; i < queues; i++) { 1408 ncs[i]->link_down = !up; 1409 } 1410 1411 if (nc->info->link_status_changed) { 1412 nc->info->link_status_changed(nc); 1413 } 1414 1415 if (nc->peer) { 1416 /* Change peer link only if the peer is NIC and then notify peer. 1417 * If the peer is a HUBPORT or a backend, we do not change the 1418 * link status. 1419 * 1420 * This behavior is compatible with qemu vlans where there could be 1421 * multiple clients that can still communicate with each other in 1422 * disconnected mode. For now maintain this compatibility. 1423 */ 1424 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1425 for (i = 0; i < queues; i++) { 1426 ncs[i]->peer->link_down = !up; 1427 } 1428 } 1429 if (nc->peer->info->link_status_changed) { 1430 nc->peer->info->link_status_changed(nc->peer); 1431 } 1432 } 1433 } 1434 1435 static void net_vm_change_state_handler(void *opaque, int running, 1436 RunState state) 1437 { 1438 NetClientState *nc; 1439 NetClientState *tmp; 1440 1441 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1442 if (running) { 1443 /* Flush queued packets and wake up backends. */ 1444 if (nc->peer && qemu_can_send_packet(nc)) { 1445 qemu_flush_queued_packets(nc->peer); 1446 } 1447 } else { 1448 /* Complete all queued packets, to guarantee we don't modify 1449 * state later when VM is not running. 1450 */ 1451 qemu_flush_or_purge_queued_packets(nc, true); 1452 } 1453 } 1454 } 1455 1456 void net_cleanup(void) 1457 { 1458 NetClientState *nc; 1459 1460 /* We may del multiple entries during qemu_del_net_client(), 1461 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1462 */ 1463 while (!QTAILQ_EMPTY(&net_clients)) { 1464 nc = QTAILQ_FIRST(&net_clients); 1465 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1466 qemu_del_nic(qemu_get_nic(nc)); 1467 } else { 1468 qemu_del_net_client(nc); 1469 } 1470 } 1471 1472 qemu_del_vm_change_state_handler(net_change_state_entry); 1473 } 1474 1475 void net_check_clients(void) 1476 { 1477 NetClientState *nc; 1478 int i; 1479 1480 net_hub_check_clients(); 1481 1482 QTAILQ_FOREACH(nc, &net_clients, next) { 1483 if (!nc->peer) { 1484 fprintf(stderr, "Warning: %s %s has no peer\n", 1485 nc->info->type == NET_CLIENT_DRIVER_NIC ? 1486 "nic" : "netdev", nc->name); 1487 } 1488 } 1489 1490 /* Check that all NICs requested via -net nic actually got created. 1491 * NICs created via -device don't need to be checked here because 1492 * they are always instantiated. 1493 */ 1494 for (i = 0; i < MAX_NICS; i++) { 1495 NICInfo *nd = &nd_table[i]; 1496 if (nd->used && !nd->instantiated) { 1497 fprintf(stderr, "Warning: requested NIC (%s, model %s) " 1498 "was not created (not supported by this machine?)\n", 1499 nd->name ? nd->name : "anonymous", 1500 nd->model ? nd->model : "unspecified"); 1501 } 1502 } 1503 } 1504 1505 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1506 { 1507 Error *local_err = NULL; 1508 1509 net_client_init(opts, false, &local_err); 1510 if (local_err) { 1511 error_report_err(local_err); 1512 return -1; 1513 } 1514 1515 return 0; 1516 } 1517 1518 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1519 { 1520 Error *local_err = NULL; 1521 int ret; 1522 1523 ret = net_client_init(opts, true, &local_err); 1524 if (local_err) { 1525 error_report_err(local_err); 1526 return -1; 1527 } 1528 1529 return ret; 1530 } 1531 1532 int net_init_clients(void) 1533 { 1534 QemuOptsList *net = qemu_find_opts("net"); 1535 1536 net_change_state_entry = 1537 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1538 1539 QTAILQ_INIT(&net_clients); 1540 1541 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1542 net_init_netdev, NULL, NULL)) { 1543 return -1; 1544 } 1545 1546 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) { 1547 return -1; 1548 } 1549 1550 return 0; 1551 } 1552 1553 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1554 { 1555 #if defined(CONFIG_SLIRP) 1556 int ret; 1557 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) { 1558 return ret; 1559 } 1560 #endif 1561 1562 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1563 return -1; 1564 } 1565 1566 return 0; 1567 } 1568 1569 /* From FreeBSD */ 1570 /* XXX: optimize */ 1571 unsigned compute_mcast_idx(const uint8_t *ep) 1572 { 1573 uint32_t crc; 1574 int carry, i, j; 1575 uint8_t b; 1576 1577 crc = 0xffffffff; 1578 for (i = 0; i < 6; i++) { 1579 b = *ep++; 1580 for (j = 0; j < 8; j++) { 1581 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1582 crc <<= 1; 1583 b >>= 1; 1584 if (carry) { 1585 crc = ((crc ^ POLYNOMIAL) | carry); 1586 } 1587 } 1588 } 1589 return crc >> 26; 1590 } 1591 1592 QemuOptsList qemu_netdev_opts = { 1593 .name = "netdev", 1594 .implied_opt_name = "type", 1595 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1596 .desc = { 1597 /* 1598 * no elements => accept any params 1599 * validation will happen later 1600 */ 1601 { /* end of list */ } 1602 }, 1603 }; 1604 1605 QemuOptsList qemu_net_opts = { 1606 .name = "net", 1607 .implied_opt_name = "type", 1608 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1609 .desc = { 1610 /* 1611 * no elements => accept any params 1612 * validation will happen later 1613 */ 1614 { /* end of list */ } 1615 }, 1616 }; 1617 1618 void net_socket_rs_init(SocketReadState *rs, 1619 SocketReadStateFinalize *finalize, 1620 bool vnet_hdr) 1621 { 1622 rs->state = 0; 1623 rs->vnet_hdr = vnet_hdr; 1624 rs->index = 0; 1625 rs->packet_len = 0; 1626 rs->vnet_hdr_len = 0; 1627 memset(rs->buf, 0, sizeof(rs->buf)); 1628 rs->finalize = finalize; 1629 } 1630 1631 /* 1632 * Returns 1633 * 0: success 1634 * -1: error occurs 1635 */ 1636 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1637 { 1638 unsigned int l; 1639 1640 while (size > 0) { 1641 /* Reassemble a packet from the network. 1642 * 0 = getting length. 1643 * 1 = getting vnet header length. 1644 * 2 = getting data. 1645 */ 1646 switch (rs->state) { 1647 case 0: 1648 l = 4 - rs->index; 1649 if (l > size) { 1650 l = size; 1651 } 1652 memcpy(rs->buf + rs->index, buf, l); 1653 buf += l; 1654 size -= l; 1655 rs->index += l; 1656 if (rs->index == 4) { 1657 /* got length */ 1658 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1659 rs->index = 0; 1660 if (rs->vnet_hdr) { 1661 rs->state = 1; 1662 } else { 1663 rs->state = 2; 1664 rs->vnet_hdr_len = 0; 1665 } 1666 } 1667 break; 1668 case 1: 1669 l = 4 - rs->index; 1670 if (l > size) { 1671 l = size; 1672 } 1673 memcpy(rs->buf + rs->index, buf, l); 1674 buf += l; 1675 size -= l; 1676 rs->index += l; 1677 if (rs->index == 4) { 1678 /* got vnet header length */ 1679 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1680 rs->index = 0; 1681 rs->state = 2; 1682 } 1683 break; 1684 case 2: 1685 l = rs->packet_len - rs->index; 1686 if (l > size) { 1687 l = size; 1688 } 1689 if (rs->index + l <= sizeof(rs->buf)) { 1690 memcpy(rs->buf + rs->index, buf, l); 1691 } else { 1692 fprintf(stderr, "serious error: oversized packet received," 1693 "connection terminated.\n"); 1694 rs->index = rs->state = 0; 1695 return -1; 1696 } 1697 1698 rs->index += l; 1699 buf += l; 1700 size -= l; 1701 if (rs->index >= rs->packet_len) { 1702 rs->index = 0; 1703 rs->state = 0; 1704 assert(rs->finalize); 1705 rs->finalize(rs); 1706 } 1707 break; 1708 } 1709 } 1710 1711 assert(size == 0); 1712 return 0; 1713 } 1714