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 25 #include "qemu/osdep.h" 26 27 #include "net/net.h" 28 #include "clients.h" 29 #include "hub.h" 30 #include "net/slirp.h" 31 #include "net/eth.h" 32 #include "util.h" 33 34 #include "monitor/monitor.h" 35 #include "qemu/help_option.h" 36 #include "qapi/qapi-commands-net.h" 37 #include "qapi/qapi-visit-net.h" 38 #include "qapi/qmp/qdict.h" 39 #include "qapi/qmp/qerror.h" 40 #include "qemu/error-report.h" 41 #include "qemu/sockets.h" 42 #include "qemu/cutils.h" 43 #include "qemu/config-file.h" 44 #include "hw/qdev.h" 45 #include "qemu/iov.h" 46 #include "qemu/main-loop.h" 47 #include "qemu/option.h" 48 #include "qapi/error.h" 49 #include "qapi/opts-visitor.h" 50 #include "sysemu/sysemu.h" 51 #include "sysemu/qtest.h" 52 #include "net/filter.h" 53 #include "qapi/string-output-visitor.h" 54 55 /* Net bridge is currently not supported for W32. */ 56 #if !defined(_WIN32) 57 # define CONFIG_NET_BRIDGE 58 #endif 59 60 static VMChangeStateEntry *net_change_state_entry; 61 static QTAILQ_HEAD(, NetClientState) net_clients; 62 63 /***********************************************************/ 64 /* network device redirectors */ 65 66 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 67 { 68 const char *p, *p1; 69 int len; 70 p = *pp; 71 p1 = strchr(p, sep); 72 if (!p1) 73 return -1; 74 len = p1 - p; 75 p1++; 76 if (buf_size > 0) { 77 if (len > buf_size - 1) 78 len = buf_size - 1; 79 memcpy(buf, p, len); 80 buf[len] = '\0'; 81 } 82 *pp = p1; 83 return 0; 84 } 85 86 int parse_host_port(struct sockaddr_in *saddr, const char *str, 87 Error **errp) 88 { 89 char buf[512]; 90 struct hostent *he; 91 const char *p, *r; 92 int port; 93 94 p = str; 95 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 96 error_setg(errp, "host address '%s' doesn't contain ':' " 97 "separating host from port", str); 98 return -1; 99 } 100 saddr->sin_family = AF_INET; 101 if (buf[0] == '\0') { 102 saddr->sin_addr.s_addr = 0; 103 } else { 104 if (qemu_isdigit(buf[0])) { 105 if (!inet_aton(buf, &saddr->sin_addr)) { 106 error_setg(errp, "host address '%s' is not a valid " 107 "IPv4 address", buf); 108 return -1; 109 } 110 } else { 111 he = gethostbyname(buf); 112 if (he == NULL) { 113 error_setg(errp, "can't resolve host address '%s'", buf); 114 return - 1; 115 } 116 saddr->sin_addr = *(struct in_addr *)he->h_addr; 117 } 118 } 119 port = strtol(p, (char **)&r, 0); 120 if (r == p) { 121 error_setg(errp, "port number '%s' is invalid", p); 122 return -1; 123 } 124 saddr->sin_port = htons(port); 125 return 0; 126 } 127 128 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 129 { 130 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 131 macaddr[0], macaddr[1], macaddr[2], 132 macaddr[3], macaddr[4], macaddr[5]); 133 } 134 135 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 136 { 137 snprintf(nc->info_str, sizeof(nc->info_str), 138 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 139 nc->model, 140 macaddr[0], macaddr[1], macaddr[2], 141 macaddr[3], macaddr[4], macaddr[5]); 142 } 143 144 static int mac_table[256] = {0}; 145 146 static void qemu_macaddr_set_used(MACAddr *macaddr) 147 { 148 int index; 149 150 for (index = 0x56; index < 0xFF; index++) { 151 if (macaddr->a[5] == index) { 152 mac_table[index]++; 153 } 154 } 155 } 156 157 static void qemu_macaddr_set_free(MACAddr *macaddr) 158 { 159 int index; 160 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 161 162 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 163 return; 164 } 165 for (index = 0x56; index < 0xFF; index++) { 166 if (macaddr->a[5] == index) { 167 mac_table[index]--; 168 } 169 } 170 } 171 172 static int qemu_macaddr_get_free(void) 173 { 174 int index; 175 176 for (index = 0x56; index < 0xFF; index++) { 177 if (mac_table[index] == 0) { 178 return index; 179 } 180 } 181 182 return -1; 183 } 184 185 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 186 { 187 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 188 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 189 190 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 191 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 192 return; 193 } else { 194 qemu_macaddr_set_used(macaddr); 195 return; 196 } 197 } 198 199 macaddr->a[0] = 0x52; 200 macaddr->a[1] = 0x54; 201 macaddr->a[2] = 0x00; 202 macaddr->a[3] = 0x12; 203 macaddr->a[4] = 0x34; 204 macaddr->a[5] = qemu_macaddr_get_free(); 205 qemu_macaddr_set_used(macaddr); 206 } 207 208 /** 209 * Generate a name for net client 210 * 211 * Only net clients created with the legacy -net option and NICs need this. 212 */ 213 static char *assign_name(NetClientState *nc1, const char *model) 214 { 215 NetClientState *nc; 216 int id = 0; 217 218 QTAILQ_FOREACH(nc, &net_clients, next) { 219 if (nc == nc1) { 220 continue; 221 } 222 if (strcmp(nc->model, model) == 0) { 223 id++; 224 } 225 } 226 227 return g_strdup_printf("%s.%d", model, id); 228 } 229 230 static void qemu_net_client_destructor(NetClientState *nc) 231 { 232 g_free(nc); 233 } 234 235 static void qemu_net_client_setup(NetClientState *nc, 236 NetClientInfo *info, 237 NetClientState *peer, 238 const char *model, 239 const char *name, 240 NetClientDestructor *destructor) 241 { 242 nc->info = info; 243 nc->model = g_strdup(model); 244 if (name) { 245 nc->name = g_strdup(name); 246 } else { 247 nc->name = assign_name(nc, model); 248 } 249 250 if (peer) { 251 assert(!peer->peer); 252 nc->peer = peer; 253 peer->peer = nc; 254 } 255 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 256 257 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 258 nc->destructor = destructor; 259 QTAILQ_INIT(&nc->filters); 260 } 261 262 NetClientState *qemu_new_net_client(NetClientInfo *info, 263 NetClientState *peer, 264 const char *model, 265 const char *name) 266 { 267 NetClientState *nc; 268 269 assert(info->size >= sizeof(NetClientState)); 270 271 nc = g_malloc0(info->size); 272 qemu_net_client_setup(nc, info, peer, model, name, 273 qemu_net_client_destructor); 274 275 return nc; 276 } 277 278 NICState *qemu_new_nic(NetClientInfo *info, 279 NICConf *conf, 280 const char *model, 281 const char *name, 282 void *opaque) 283 { 284 NetClientState **peers = conf->peers.ncs; 285 NICState *nic; 286 int i, queues = MAX(1, conf->peers.queues); 287 288 assert(info->type == NET_CLIENT_DRIVER_NIC); 289 assert(info->size >= sizeof(NICState)); 290 291 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 292 nic->ncs = (void *)nic + info->size; 293 nic->conf = conf; 294 nic->opaque = opaque; 295 296 for (i = 0; i < queues; i++) { 297 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 298 NULL); 299 nic->ncs[i].queue_index = i; 300 } 301 302 return nic; 303 } 304 305 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 306 { 307 return nic->ncs + queue_index; 308 } 309 310 NetClientState *qemu_get_queue(NICState *nic) 311 { 312 return qemu_get_subqueue(nic, 0); 313 } 314 315 NICState *qemu_get_nic(NetClientState *nc) 316 { 317 NetClientState *nc0 = nc - nc->queue_index; 318 319 return (NICState *)((void *)nc0 - nc->info->size); 320 } 321 322 void *qemu_get_nic_opaque(NetClientState *nc) 323 { 324 NICState *nic = qemu_get_nic(nc); 325 326 return nic->opaque; 327 } 328 329 static void qemu_cleanup_net_client(NetClientState *nc) 330 { 331 QTAILQ_REMOVE(&net_clients, nc, next); 332 333 if (nc->info->cleanup) { 334 nc->info->cleanup(nc); 335 } 336 } 337 338 static void qemu_free_net_client(NetClientState *nc) 339 { 340 if (nc->incoming_queue) { 341 qemu_del_net_queue(nc->incoming_queue); 342 } 343 if (nc->peer) { 344 nc->peer->peer = NULL; 345 } 346 g_free(nc->name); 347 g_free(nc->model); 348 if (nc->destructor) { 349 nc->destructor(nc); 350 } 351 } 352 353 void qemu_del_net_client(NetClientState *nc) 354 { 355 NetClientState *ncs[MAX_QUEUE_NUM]; 356 int queues, i; 357 NetFilterState *nf, *next; 358 359 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 360 361 /* If the NetClientState belongs to a multiqueue backend, we will change all 362 * other NetClientStates also. 363 */ 364 queues = qemu_find_net_clients_except(nc->name, ncs, 365 NET_CLIENT_DRIVER_NIC, 366 MAX_QUEUE_NUM); 367 assert(queues != 0); 368 369 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 370 object_unparent(OBJECT(nf)); 371 } 372 373 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 374 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 375 NICState *nic = qemu_get_nic(nc->peer); 376 if (nic->peer_deleted) { 377 return; 378 } 379 nic->peer_deleted = true; 380 381 for (i = 0; i < queues; i++) { 382 ncs[i]->peer->link_down = true; 383 } 384 385 if (nc->peer->info->link_status_changed) { 386 nc->peer->info->link_status_changed(nc->peer); 387 } 388 389 for (i = 0; i < queues; i++) { 390 qemu_cleanup_net_client(ncs[i]); 391 } 392 393 return; 394 } 395 396 for (i = 0; i < queues; i++) { 397 qemu_cleanup_net_client(ncs[i]); 398 qemu_free_net_client(ncs[i]); 399 } 400 } 401 402 void qemu_del_nic(NICState *nic) 403 { 404 int i, queues = MAX(nic->conf->peers.queues, 1); 405 406 qemu_macaddr_set_free(&nic->conf->macaddr); 407 408 /* If this is a peer NIC and peer has already been deleted, free it now. */ 409 if (nic->peer_deleted) { 410 for (i = 0; i < queues; i++) { 411 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 412 } 413 } 414 415 for (i = queues - 1; i >= 0; i--) { 416 NetClientState *nc = qemu_get_subqueue(nic, i); 417 418 qemu_cleanup_net_client(nc); 419 qemu_free_net_client(nc); 420 } 421 422 g_free(nic); 423 } 424 425 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 426 { 427 NetClientState *nc; 428 429 QTAILQ_FOREACH(nc, &net_clients, next) { 430 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 431 if (nc->queue_index == 0) { 432 func(qemu_get_nic(nc), opaque); 433 } 434 } 435 } 436 } 437 438 bool qemu_has_ufo(NetClientState *nc) 439 { 440 if (!nc || !nc->info->has_ufo) { 441 return false; 442 } 443 444 return nc->info->has_ufo(nc); 445 } 446 447 bool qemu_has_vnet_hdr(NetClientState *nc) 448 { 449 if (!nc || !nc->info->has_vnet_hdr) { 450 return false; 451 } 452 453 return nc->info->has_vnet_hdr(nc); 454 } 455 456 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 457 { 458 if (!nc || !nc->info->has_vnet_hdr_len) { 459 return false; 460 } 461 462 return nc->info->has_vnet_hdr_len(nc, len); 463 } 464 465 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 466 { 467 if (!nc || !nc->info->using_vnet_hdr) { 468 return; 469 } 470 471 nc->info->using_vnet_hdr(nc, enable); 472 } 473 474 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 475 int ecn, int ufo) 476 { 477 if (!nc || !nc->info->set_offload) { 478 return; 479 } 480 481 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 482 } 483 484 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 485 { 486 if (!nc || !nc->info->set_vnet_hdr_len) { 487 return; 488 } 489 490 nc->vnet_hdr_len = len; 491 nc->info->set_vnet_hdr_len(nc, len); 492 } 493 494 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 495 { 496 #ifdef HOST_WORDS_BIGENDIAN 497 if (!nc || !nc->info->set_vnet_le) { 498 return -ENOSYS; 499 } 500 501 return nc->info->set_vnet_le(nc, is_le); 502 #else 503 return 0; 504 #endif 505 } 506 507 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 508 { 509 #ifdef HOST_WORDS_BIGENDIAN 510 return 0; 511 #else 512 if (!nc || !nc->info->set_vnet_be) { 513 return -ENOSYS; 514 } 515 516 return nc->info->set_vnet_be(nc, is_be); 517 #endif 518 } 519 520 int qemu_can_send_packet(NetClientState *sender) 521 { 522 int vm_running = runstate_is_running(); 523 524 if (!vm_running) { 525 return 0; 526 } 527 528 if (!sender->peer) { 529 return 1; 530 } 531 532 if (sender->peer->receive_disabled) { 533 return 0; 534 } else if (sender->peer->info->can_receive && 535 !sender->peer->info->can_receive(sender->peer)) { 536 return 0; 537 } 538 return 1; 539 } 540 541 static ssize_t filter_receive_iov(NetClientState *nc, 542 NetFilterDirection direction, 543 NetClientState *sender, 544 unsigned flags, 545 const struct iovec *iov, 546 int iovcnt, 547 NetPacketSent *sent_cb) 548 { 549 ssize_t ret = 0; 550 NetFilterState *nf = NULL; 551 552 if (direction == NET_FILTER_DIRECTION_TX) { 553 QTAILQ_FOREACH(nf, &nc->filters, next) { 554 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 555 iovcnt, sent_cb); 556 if (ret) { 557 return ret; 558 } 559 } 560 } else { 561 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) { 562 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 563 iovcnt, sent_cb); 564 if (ret) { 565 return ret; 566 } 567 } 568 } 569 570 return ret; 571 } 572 573 static ssize_t filter_receive(NetClientState *nc, 574 NetFilterDirection direction, 575 NetClientState *sender, 576 unsigned flags, 577 const uint8_t *data, 578 size_t size, 579 NetPacketSent *sent_cb) 580 { 581 struct iovec iov = { 582 .iov_base = (void *)data, 583 .iov_len = size 584 }; 585 586 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 587 } 588 589 void qemu_purge_queued_packets(NetClientState *nc) 590 { 591 if (!nc->peer) { 592 return; 593 } 594 595 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 596 } 597 598 static 599 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 600 { 601 nc->receive_disabled = 0; 602 603 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 604 if (net_hub_flush(nc->peer)) { 605 qemu_notify_event(); 606 } 607 } 608 if (qemu_net_queue_flush(nc->incoming_queue)) { 609 /* We emptied the queue successfully, signal to the IO thread to repoll 610 * the file descriptor (for tap, for example). 611 */ 612 qemu_notify_event(); 613 } else if (purge) { 614 /* Unable to empty the queue, purge remaining packets */ 615 qemu_net_queue_purge(nc->incoming_queue, nc); 616 } 617 } 618 619 void qemu_flush_queued_packets(NetClientState *nc) 620 { 621 qemu_flush_or_purge_queued_packets(nc, false); 622 } 623 624 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 625 unsigned flags, 626 const uint8_t *buf, int size, 627 NetPacketSent *sent_cb) 628 { 629 NetQueue *queue; 630 int ret; 631 632 #ifdef DEBUG_NET 633 printf("qemu_send_packet_async:\n"); 634 qemu_hexdump((const char *)buf, stdout, "net", size); 635 #endif 636 637 if (sender->link_down || !sender->peer) { 638 return size; 639 } 640 641 /* Let filters handle the packet first */ 642 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 643 sender, flags, buf, size, sent_cb); 644 if (ret) { 645 return ret; 646 } 647 648 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 649 sender, flags, buf, size, sent_cb); 650 if (ret) { 651 return ret; 652 } 653 654 queue = sender->peer->incoming_queue; 655 656 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 657 } 658 659 ssize_t qemu_send_packet_async(NetClientState *sender, 660 const uint8_t *buf, int size, 661 NetPacketSent *sent_cb) 662 { 663 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 664 buf, size, sent_cb); 665 } 666 667 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 668 { 669 qemu_send_packet_async(nc, buf, size, NULL); 670 } 671 672 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 673 { 674 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 675 buf, size, NULL); 676 } 677 678 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 679 int iovcnt, unsigned flags) 680 { 681 uint8_t *buf = NULL; 682 uint8_t *buffer; 683 size_t offset; 684 ssize_t ret; 685 686 if (iovcnt == 1) { 687 buffer = iov[0].iov_base; 688 offset = iov[0].iov_len; 689 } else { 690 offset = iov_size(iov, iovcnt); 691 if (offset > NET_BUFSIZE) { 692 return -1; 693 } 694 buf = g_malloc(offset); 695 buffer = buf; 696 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 697 } 698 699 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 700 ret = nc->info->receive_raw(nc, buffer, offset); 701 } else { 702 ret = nc->info->receive(nc, buffer, offset); 703 } 704 705 g_free(buf); 706 return ret; 707 } 708 709 ssize_t qemu_deliver_packet_iov(NetClientState *sender, 710 unsigned flags, 711 const struct iovec *iov, 712 int iovcnt, 713 void *opaque) 714 { 715 NetClientState *nc = opaque; 716 int ret; 717 718 if (nc->link_down) { 719 return iov_size(iov, iovcnt); 720 } 721 722 if (nc->receive_disabled) { 723 return 0; 724 } 725 726 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 727 ret = nc->info->receive_iov(nc, iov, iovcnt); 728 } else { 729 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 730 } 731 732 if (ret == 0) { 733 nc->receive_disabled = 1; 734 } 735 736 return ret; 737 } 738 739 ssize_t qemu_sendv_packet_async(NetClientState *sender, 740 const struct iovec *iov, int iovcnt, 741 NetPacketSent *sent_cb) 742 { 743 NetQueue *queue; 744 int ret; 745 746 if (sender->link_down || !sender->peer) { 747 return iov_size(iov, iovcnt); 748 } 749 750 /* Let filters handle the packet first */ 751 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 752 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 753 if (ret) { 754 return ret; 755 } 756 757 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 758 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 759 if (ret) { 760 return ret; 761 } 762 763 queue = sender->peer->incoming_queue; 764 765 return qemu_net_queue_send_iov(queue, sender, 766 QEMU_NET_PACKET_FLAG_NONE, 767 iov, iovcnt, sent_cb); 768 } 769 770 ssize_t 771 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 772 { 773 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 774 } 775 776 NetClientState *qemu_find_netdev(const char *id) 777 { 778 NetClientState *nc; 779 780 QTAILQ_FOREACH(nc, &net_clients, next) { 781 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 782 continue; 783 if (!strcmp(nc->name, id)) { 784 return nc; 785 } 786 } 787 788 return NULL; 789 } 790 791 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 792 NetClientDriver type, int max) 793 { 794 NetClientState *nc; 795 int ret = 0; 796 797 QTAILQ_FOREACH(nc, &net_clients, next) { 798 if (nc->info->type == type) { 799 continue; 800 } 801 if (!id || !strcmp(nc->name, id)) { 802 if (ret < max) { 803 ncs[ret] = nc; 804 } 805 ret++; 806 } 807 } 808 809 return ret; 810 } 811 812 static int nic_get_free_idx(void) 813 { 814 int index; 815 816 for (index = 0; index < MAX_NICS; index++) 817 if (!nd_table[index].used) 818 return index; 819 return -1; 820 } 821 822 int qemu_show_nic_models(const char *arg, const char *const *models) 823 { 824 int i; 825 826 if (!arg || !is_help_option(arg)) { 827 return 0; 828 } 829 830 fprintf(stderr, "qemu: Supported NIC models: "); 831 for (i = 0 ; models[i]; i++) 832 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); 833 return 1; 834 } 835 836 void qemu_check_nic_model(NICInfo *nd, const char *model) 837 { 838 const char *models[2]; 839 840 models[0] = model; 841 models[1] = NULL; 842 843 if (qemu_show_nic_models(nd->model, models)) 844 exit(0); 845 if (qemu_find_nic_model(nd, models, model) < 0) 846 exit(1); 847 } 848 849 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 850 const char *default_model) 851 { 852 int i; 853 854 if (!nd->model) 855 nd->model = g_strdup(default_model); 856 857 for (i = 0 ; models[i]; i++) { 858 if (strcmp(nd->model, models[i]) == 0) 859 return i; 860 } 861 862 error_report("Unsupported NIC model: %s", nd->model); 863 return -1; 864 } 865 866 static int net_init_nic(const Netdev *netdev, const char *name, 867 NetClientState *peer, Error **errp) 868 { 869 int idx; 870 NICInfo *nd; 871 const NetLegacyNicOptions *nic; 872 873 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 874 nic = &netdev->u.nic; 875 876 idx = nic_get_free_idx(); 877 if (idx == -1 || nb_nics >= MAX_NICS) { 878 error_setg(errp, "too many NICs"); 879 return -1; 880 } 881 882 nd = &nd_table[idx]; 883 884 memset(nd, 0, sizeof(*nd)); 885 886 if (nic->has_netdev) { 887 nd->netdev = qemu_find_netdev(nic->netdev); 888 if (!nd->netdev) { 889 error_setg(errp, "netdev '%s' not found", nic->netdev); 890 return -1; 891 } 892 } else { 893 assert(peer); 894 nd->netdev = peer; 895 } 896 nd->name = g_strdup(name); 897 if (nic->has_model) { 898 nd->model = g_strdup(nic->model); 899 } 900 if (nic->has_addr) { 901 nd->devaddr = g_strdup(nic->addr); 902 } 903 904 if (nic->has_macaddr && 905 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 906 error_setg(errp, "invalid syntax for ethernet address"); 907 return -1; 908 } 909 if (nic->has_macaddr && 910 is_multicast_ether_addr(nd->macaddr.a)) { 911 error_setg(errp, 912 "NIC cannot have multicast MAC address (odd 1st byte)"); 913 return -1; 914 } 915 qemu_macaddr_default_if_unset(&nd->macaddr); 916 917 if (nic->has_vectors) { 918 if (nic->vectors > 0x7ffffff) { 919 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 920 return -1; 921 } 922 nd->nvectors = nic->vectors; 923 } else { 924 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 925 } 926 927 nd->used = 1; 928 nb_nics++; 929 930 return idx; 931 } 932 933 934 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 935 const Netdev *netdev, 936 const char *name, 937 NetClientState *peer, Error **errp) = { 938 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 939 #ifdef CONFIG_SLIRP 940 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 941 #endif 942 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 943 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 944 #ifdef CONFIG_VDE 945 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 946 #endif 947 #ifdef CONFIG_NETMAP 948 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 949 #endif 950 #ifdef CONFIG_NET_BRIDGE 951 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 952 #endif 953 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 954 #ifdef CONFIG_VHOST_NET_USED 955 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 956 #endif 957 #ifdef CONFIG_L2TPV3 958 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 959 #endif 960 }; 961 962 963 static int net_client_init1(const void *object, bool is_netdev, Error **errp) 964 { 965 Netdev legacy = {0}; 966 const Netdev *netdev; 967 const char *name; 968 NetClientState *peer = NULL; 969 static bool vlan_warned; 970 971 if (is_netdev) { 972 netdev = object; 973 name = netdev->id; 974 975 if (netdev->type == NET_CLIENT_DRIVER_NIC || 976 !net_client_init_fun[netdev->type]) { 977 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 978 "a netdev backend type"); 979 return -1; 980 } 981 } else { 982 const NetLegacy *net = object; 983 const NetLegacyOptions *opts = net->opts; 984 legacy.id = net->id; 985 netdev = &legacy; 986 /* missing optional values have been initialized to "all bits zero" */ 987 name = net->has_id ? net->id : net->name; 988 989 /* Map the old options to the new flat type */ 990 switch (opts->type) { 991 case NET_LEGACY_OPTIONS_TYPE_NONE: 992 return 0; /* nothing to do */ 993 case NET_LEGACY_OPTIONS_TYPE_NIC: 994 legacy.type = NET_CLIENT_DRIVER_NIC; 995 legacy.u.nic = opts->u.nic; 996 break; 997 case NET_LEGACY_OPTIONS_TYPE_USER: 998 legacy.type = NET_CLIENT_DRIVER_USER; 999 legacy.u.user = opts->u.user; 1000 break; 1001 case NET_LEGACY_OPTIONS_TYPE_TAP: 1002 legacy.type = NET_CLIENT_DRIVER_TAP; 1003 legacy.u.tap = opts->u.tap; 1004 break; 1005 case NET_LEGACY_OPTIONS_TYPE_L2TPV3: 1006 legacy.type = NET_CLIENT_DRIVER_L2TPV3; 1007 legacy.u.l2tpv3 = opts->u.l2tpv3; 1008 break; 1009 case NET_LEGACY_OPTIONS_TYPE_SOCKET: 1010 legacy.type = NET_CLIENT_DRIVER_SOCKET; 1011 legacy.u.socket = opts->u.socket; 1012 break; 1013 case NET_LEGACY_OPTIONS_TYPE_VDE: 1014 legacy.type = NET_CLIENT_DRIVER_VDE; 1015 legacy.u.vde = opts->u.vde; 1016 break; 1017 case NET_LEGACY_OPTIONS_TYPE_BRIDGE: 1018 legacy.type = NET_CLIENT_DRIVER_BRIDGE; 1019 legacy.u.bridge = opts->u.bridge; 1020 break; 1021 case NET_LEGACY_OPTIONS_TYPE_NETMAP: 1022 legacy.type = NET_CLIENT_DRIVER_NETMAP; 1023 legacy.u.netmap = opts->u.netmap; 1024 break; 1025 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER: 1026 legacy.type = NET_CLIENT_DRIVER_VHOST_USER; 1027 legacy.u.vhost_user = opts->u.vhost_user; 1028 break; 1029 default: 1030 abort(); 1031 } 1032 1033 if (!net_client_init_fun[netdev->type]) { 1034 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1035 "a net backend type (maybe it is not compiled " 1036 "into this binary)"); 1037 return -1; 1038 } 1039 1040 /* Do not add to a vlan if it's a nic with a netdev= parameter. */ 1041 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1042 !opts->u.nic.has_netdev) { 1043 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL, NULL); 1044 } 1045 1046 if (net->has_vlan && !vlan_warned) { 1047 error_report("'vlan' is deprecated. Please use 'netdev' instead."); 1048 vlan_warned = true; 1049 } 1050 } 1051 1052 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) { 1053 /* FIXME drop when all init functions store an Error */ 1054 if (errp && !*errp) { 1055 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1056 NetClientDriver_str(netdev->type)); 1057 } 1058 return -1; 1059 } 1060 return 0; 1061 } 1062 1063 static void show_netdevs(void) 1064 { 1065 int idx; 1066 const char *available_netdevs[] = { 1067 "socket", 1068 "hubport", 1069 "tap", 1070 #ifdef CONFIG_SLIRP 1071 "user", 1072 #endif 1073 #ifdef CONFIG_L2TPV3 1074 "l2tpv3", 1075 #endif 1076 #ifdef CONFIG_VDE 1077 "vde", 1078 #endif 1079 #ifdef CONFIG_NET_BRIDGE 1080 "bridge", 1081 #endif 1082 #ifdef CONFIG_NETMAP 1083 "netmap", 1084 #endif 1085 #ifdef CONFIG_POSIX 1086 "vhost-user", 1087 #endif 1088 }; 1089 1090 printf("Available netdev backend types:\n"); 1091 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1092 puts(available_netdevs[idx]); 1093 } 1094 } 1095 1096 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1097 { 1098 void *object = NULL; 1099 Error *err = NULL; 1100 int ret = -1; 1101 Visitor *v = opts_visitor_new(opts); 1102 1103 if (is_netdev && is_help_option(qemu_opt_get(opts, "type"))) { 1104 show_netdevs(); 1105 exit(0); 1106 } else { 1107 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1108 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1109 1110 if (ip6_net) { 1111 char buf[strlen(ip6_net) + 1]; 1112 1113 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) { 1114 /* Default 64bit prefix length. */ 1115 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort); 1116 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort); 1117 } else { 1118 /* User-specified prefix length. */ 1119 unsigned long len; 1120 int err; 1121 1122 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort); 1123 err = qemu_strtoul(ip6_net, NULL, 10, &len); 1124 1125 if (err) { 1126 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1127 "ipv6-prefix", "a number"); 1128 } else { 1129 qemu_opt_set_number(opts, "ipv6-prefixlen", len, 1130 &error_abort); 1131 } 1132 } 1133 qemu_opt_unset(opts, "ipv6-net"); 1134 } 1135 } 1136 1137 if (is_netdev) { 1138 visit_type_Netdev(v, NULL, (Netdev **)&object, &err); 1139 } else { 1140 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err); 1141 } 1142 1143 if (!err) { 1144 ret = net_client_init1(object, is_netdev, &err); 1145 } 1146 1147 if (is_netdev) { 1148 qapi_free_Netdev(object); 1149 } else { 1150 qapi_free_NetLegacy(object); 1151 } 1152 1153 error_propagate(errp, err); 1154 visit_free(v); 1155 return ret; 1156 } 1157 1158 void netdev_add(QemuOpts *opts, Error **errp) 1159 { 1160 net_client_init(opts, true, errp); 1161 } 1162 1163 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1164 { 1165 Error *local_err = NULL; 1166 QemuOptsList *opts_list; 1167 QemuOpts *opts; 1168 1169 opts_list = qemu_find_opts_err("netdev", &local_err); 1170 if (local_err) { 1171 goto out; 1172 } 1173 1174 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1175 if (local_err) { 1176 goto out; 1177 } 1178 1179 netdev_add(opts, &local_err); 1180 if (local_err) { 1181 qemu_opts_del(opts); 1182 goto out; 1183 } 1184 1185 out: 1186 error_propagate(errp, local_err); 1187 } 1188 1189 void qmp_netdev_del(const char *id, Error **errp) 1190 { 1191 NetClientState *nc; 1192 QemuOpts *opts; 1193 1194 nc = qemu_find_netdev(id); 1195 if (!nc) { 1196 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1197 "Device '%s' not found", id); 1198 return; 1199 } 1200 1201 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1202 if (!opts) { 1203 error_setg(errp, "Device '%s' is not a netdev", id); 1204 return; 1205 } 1206 1207 qemu_del_net_client(nc); 1208 qemu_opts_del(opts); 1209 } 1210 1211 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1212 { 1213 char *str; 1214 ObjectProperty *prop; 1215 ObjectPropertyIterator iter; 1216 Visitor *v; 1217 1218 /* generate info str */ 1219 object_property_iter_init(&iter, OBJECT(nf)); 1220 while ((prop = object_property_iter_next(&iter))) { 1221 if (!strcmp(prop->name, "type")) { 1222 continue; 1223 } 1224 v = string_output_visitor_new(false, &str); 1225 object_property_get(OBJECT(nf), v, prop->name, NULL); 1226 visit_complete(v, &str); 1227 visit_free(v); 1228 monitor_printf(mon, ",%s=%s", prop->name, str); 1229 g_free(str); 1230 } 1231 monitor_printf(mon, "\n"); 1232 } 1233 1234 void print_net_client(Monitor *mon, NetClientState *nc) 1235 { 1236 NetFilterState *nf; 1237 1238 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1239 nc->queue_index, 1240 NetClientDriver_str(nc->info->type), 1241 nc->info_str); 1242 if (!QTAILQ_EMPTY(&nc->filters)) { 1243 monitor_printf(mon, "filters:\n"); 1244 } 1245 QTAILQ_FOREACH(nf, &nc->filters, next) { 1246 char *path = object_get_canonical_path_component(OBJECT(nf)); 1247 1248 monitor_printf(mon, " - %s: type=%s", path, 1249 object_get_typename(OBJECT(nf))); 1250 netfilter_print_info(mon, nf); 1251 g_free(path); 1252 } 1253 } 1254 1255 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1256 Error **errp) 1257 { 1258 NetClientState *nc; 1259 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1260 1261 QTAILQ_FOREACH(nc, &net_clients, next) { 1262 RxFilterInfoList *entry; 1263 RxFilterInfo *info; 1264 1265 if (has_name && strcmp(nc->name, name) != 0) { 1266 continue; 1267 } 1268 1269 /* only query rx-filter information of NIC */ 1270 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1271 if (has_name) { 1272 error_setg(errp, "net client(%s) isn't a NIC", name); 1273 return NULL; 1274 } 1275 continue; 1276 } 1277 1278 /* only query information on queue 0 since the info is per nic, 1279 * not per queue 1280 */ 1281 if (nc->queue_index != 0) 1282 continue; 1283 1284 if (nc->info->query_rx_filter) { 1285 info = nc->info->query_rx_filter(nc); 1286 entry = g_malloc0(sizeof(*entry)); 1287 entry->value = info; 1288 1289 if (!filter_list) { 1290 filter_list = entry; 1291 } else { 1292 last_entry->next = entry; 1293 } 1294 last_entry = entry; 1295 } else if (has_name) { 1296 error_setg(errp, "net client(%s) doesn't support" 1297 " rx-filter querying", name); 1298 return NULL; 1299 } 1300 1301 if (has_name) { 1302 break; 1303 } 1304 } 1305 1306 if (filter_list == NULL && has_name) { 1307 error_setg(errp, "invalid net client name: %s", name); 1308 } 1309 1310 return filter_list; 1311 } 1312 1313 void hmp_info_network(Monitor *mon, const QDict *qdict) 1314 { 1315 NetClientState *nc, *peer; 1316 NetClientDriver type; 1317 1318 net_hub_info(mon); 1319 1320 QTAILQ_FOREACH(nc, &net_clients, next) { 1321 peer = nc->peer; 1322 type = nc->info->type; 1323 1324 /* Skip if already printed in hub info */ 1325 if (net_hub_id_for_client(nc, NULL) == 0) { 1326 continue; 1327 } 1328 1329 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1330 print_net_client(mon, nc); 1331 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1332 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1333 monitor_printf(mon, " \\ "); 1334 print_net_client(mon, peer); 1335 } 1336 } 1337 } 1338 1339 void qmp_set_link(const char *name, bool up, Error **errp) 1340 { 1341 NetClientState *ncs[MAX_QUEUE_NUM]; 1342 NetClientState *nc; 1343 int queues, i; 1344 1345 queues = qemu_find_net_clients_except(name, ncs, 1346 NET_CLIENT_DRIVER__MAX, 1347 MAX_QUEUE_NUM); 1348 1349 if (queues == 0) { 1350 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1351 "Device '%s' not found", name); 1352 return; 1353 } 1354 nc = ncs[0]; 1355 1356 for (i = 0; i < queues; i++) { 1357 ncs[i]->link_down = !up; 1358 } 1359 1360 if (nc->info->link_status_changed) { 1361 nc->info->link_status_changed(nc); 1362 } 1363 1364 if (nc->peer) { 1365 /* Change peer link only if the peer is NIC and then notify peer. 1366 * If the peer is a HUBPORT or a backend, we do not change the 1367 * link status. 1368 * 1369 * This behavior is compatible with qemu vlans where there could be 1370 * multiple clients that can still communicate with each other in 1371 * disconnected mode. For now maintain this compatibility. 1372 */ 1373 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1374 for (i = 0; i < queues; i++) { 1375 ncs[i]->peer->link_down = !up; 1376 } 1377 } 1378 if (nc->peer->info->link_status_changed) { 1379 nc->peer->info->link_status_changed(nc->peer); 1380 } 1381 } 1382 } 1383 1384 static void net_vm_change_state_handler(void *opaque, int running, 1385 RunState state) 1386 { 1387 NetClientState *nc; 1388 NetClientState *tmp; 1389 1390 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1391 if (running) { 1392 /* Flush queued packets and wake up backends. */ 1393 if (nc->peer && qemu_can_send_packet(nc)) { 1394 qemu_flush_queued_packets(nc->peer); 1395 } 1396 } else { 1397 /* Complete all queued packets, to guarantee we don't modify 1398 * state later when VM is not running. 1399 */ 1400 qemu_flush_or_purge_queued_packets(nc, true); 1401 } 1402 } 1403 } 1404 1405 void net_cleanup(void) 1406 { 1407 NetClientState *nc; 1408 1409 /* We may del multiple entries during qemu_del_net_client(), 1410 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1411 */ 1412 while (!QTAILQ_EMPTY(&net_clients)) { 1413 nc = QTAILQ_FIRST(&net_clients); 1414 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1415 qemu_del_nic(qemu_get_nic(nc)); 1416 } else { 1417 qemu_del_net_client(nc); 1418 } 1419 } 1420 1421 qemu_del_vm_change_state_handler(net_change_state_entry); 1422 } 1423 1424 void net_check_clients(void) 1425 { 1426 NetClientState *nc; 1427 int i; 1428 1429 net_hub_check_clients(); 1430 1431 QTAILQ_FOREACH(nc, &net_clients, next) { 1432 if (!nc->peer) { 1433 warn_report("%s %s has no peer", 1434 nc->info->type == NET_CLIENT_DRIVER_NIC 1435 ? "nic" : "netdev", 1436 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 warn_report("requested NIC (%s, model %s) " 1448 "was not created (not supported by this machine?)", 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 return net_client_init(opts, false, errp); 1458 } 1459 1460 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1461 { 1462 return net_client_init(opts, true, errp); 1463 } 1464 1465 /* For the convenience "--nic" parameter */ 1466 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1467 { 1468 char *mac, *nd_id; 1469 int idx, ret; 1470 NICInfo *ni; 1471 const char *type; 1472 1473 type = qemu_opt_get(opts, "type"); 1474 if (type && g_str_equal(type, "none")) { 1475 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1476 } 1477 1478 idx = nic_get_free_idx(); 1479 if (idx == -1 || nb_nics >= MAX_NICS) { 1480 error_setg(errp, "no more on-board/default NIC slots available"); 1481 return -1; 1482 } 1483 1484 if (!type) { 1485 qemu_opt_set(opts, "type", "user", &error_abort); 1486 } 1487 1488 ni = &nd_table[idx]; 1489 memset(ni, 0, sizeof(*ni)); 1490 ni->model = qemu_opt_get_del(opts, "model"); 1491 1492 /* Create an ID if the user did not specify one */ 1493 nd_id = g_strdup(qemu_opts_id(opts)); 1494 if (!nd_id) { 1495 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx); 1496 qemu_opts_set_id(opts, nd_id); 1497 } 1498 1499 /* Handle MAC address */ 1500 mac = qemu_opt_get_del(opts, "mac"); 1501 if (mac) { 1502 ret = net_parse_macaddr(ni->macaddr.a, mac); 1503 g_free(mac); 1504 if (ret) { 1505 error_setg(errp, "invalid syntax for ethernet address"); 1506 return -1; 1507 } 1508 if (is_multicast_ether_addr(ni->macaddr.a)) { 1509 error_setg(errp, "NIC cannot have multicast MAC address"); 1510 return -1; 1511 } 1512 } 1513 qemu_macaddr_default_if_unset(&ni->macaddr); 1514 1515 ret = net_client_init(opts, true, errp); 1516 if (ret == 0) { 1517 ni->netdev = qemu_find_netdev(nd_id); 1518 ni->used = true; 1519 nb_nics++; 1520 } 1521 1522 g_free(nd_id); 1523 return ret; 1524 } 1525 1526 int net_init_clients(Error **errp) 1527 { 1528 net_change_state_entry = 1529 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1530 1531 QTAILQ_INIT(&net_clients); 1532 1533 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1534 net_init_netdev, NULL, errp)) { 1535 return -1; 1536 } 1537 1538 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1539 return -1; 1540 } 1541 1542 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1543 return -1; 1544 } 1545 1546 return 0; 1547 } 1548 1549 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1550 { 1551 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1552 return -1; 1553 } 1554 1555 return 0; 1556 } 1557 1558 /* From FreeBSD */ 1559 /* XXX: optimize */ 1560 uint32_t net_crc32(const uint8_t *p, int len) 1561 { 1562 uint32_t crc; 1563 int carry, i, j; 1564 uint8_t b; 1565 1566 crc = 0xffffffff; 1567 for (i = 0; i < len; i++) { 1568 b = *p++; 1569 for (j = 0; j < 8; j++) { 1570 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1571 crc <<= 1; 1572 b >>= 1; 1573 if (carry) { 1574 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1575 } 1576 } 1577 } 1578 1579 return crc; 1580 } 1581 1582 uint32_t net_crc32_le(const uint8_t *p, int len) 1583 { 1584 uint32_t crc; 1585 int carry, i, j; 1586 uint8_t b; 1587 1588 crc = 0xffffffff; 1589 for (i = 0; i < len; i++) { 1590 b = *p++; 1591 for (j = 0; j < 8; j++) { 1592 carry = (crc & 0x1) ^ (b & 0x01); 1593 crc >>= 1; 1594 b >>= 1; 1595 if (carry) { 1596 crc ^= POLYNOMIAL_LE; 1597 } 1598 } 1599 } 1600 1601 return crc; 1602 } 1603 1604 QemuOptsList qemu_netdev_opts = { 1605 .name = "netdev", 1606 .implied_opt_name = "type", 1607 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1608 .desc = { 1609 /* 1610 * no elements => accept any params 1611 * validation will happen later 1612 */ 1613 { /* end of list */ } 1614 }, 1615 }; 1616 1617 QemuOptsList qemu_nic_opts = { 1618 .name = "nic", 1619 .implied_opt_name = "type", 1620 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1621 .desc = { 1622 /* 1623 * no elements => accept any params 1624 * validation will happen later 1625 */ 1626 { /* end of list */ } 1627 }, 1628 }; 1629 1630 QemuOptsList qemu_net_opts = { 1631 .name = "net", 1632 .implied_opt_name = "type", 1633 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1634 .desc = { 1635 /* 1636 * no elements => accept any params 1637 * validation will happen later 1638 */ 1639 { /* end of list */ } 1640 }, 1641 }; 1642 1643 void net_socket_rs_init(SocketReadState *rs, 1644 SocketReadStateFinalize *finalize, 1645 bool vnet_hdr) 1646 { 1647 rs->state = 0; 1648 rs->vnet_hdr = vnet_hdr; 1649 rs->index = 0; 1650 rs->packet_len = 0; 1651 rs->vnet_hdr_len = 0; 1652 memset(rs->buf, 0, sizeof(rs->buf)); 1653 rs->finalize = finalize; 1654 } 1655 1656 /* 1657 * Returns 1658 * 0: success 1659 * -1: error occurs 1660 */ 1661 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1662 { 1663 unsigned int l; 1664 1665 while (size > 0) { 1666 /* Reassemble a packet from the network. 1667 * 0 = getting length. 1668 * 1 = getting vnet header length. 1669 * 2 = getting data. 1670 */ 1671 switch (rs->state) { 1672 case 0: 1673 l = 4 - rs->index; 1674 if (l > size) { 1675 l = size; 1676 } 1677 memcpy(rs->buf + rs->index, buf, l); 1678 buf += l; 1679 size -= l; 1680 rs->index += l; 1681 if (rs->index == 4) { 1682 /* got length */ 1683 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1684 rs->index = 0; 1685 if (rs->vnet_hdr) { 1686 rs->state = 1; 1687 } else { 1688 rs->state = 2; 1689 rs->vnet_hdr_len = 0; 1690 } 1691 } 1692 break; 1693 case 1: 1694 l = 4 - rs->index; 1695 if (l > size) { 1696 l = size; 1697 } 1698 memcpy(rs->buf + rs->index, buf, l); 1699 buf += l; 1700 size -= l; 1701 rs->index += l; 1702 if (rs->index == 4) { 1703 /* got vnet header length */ 1704 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1705 rs->index = 0; 1706 rs->state = 2; 1707 } 1708 break; 1709 case 2: 1710 l = rs->packet_len - rs->index; 1711 if (l > size) { 1712 l = size; 1713 } 1714 if (rs->index + l <= sizeof(rs->buf)) { 1715 memcpy(rs->buf + rs->index, buf, l); 1716 } else { 1717 fprintf(stderr, "serious error: oversized packet received," 1718 "connection terminated.\n"); 1719 rs->index = rs->state = 0; 1720 return -1; 1721 } 1722 1723 rs->index += l; 1724 buf += l; 1725 size -= l; 1726 if (rs->index >= rs->packet_len) { 1727 rs->index = 0; 1728 rs->state = 0; 1729 assert(rs->finalize); 1730 rs->finalize(rs); 1731 } 1732 break; 1733 } 1734 } 1735 1736 assert(size == 0); 1737 return 0; 1738 } 1739