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 "hw/qdev-properties.h" 31 #include "net/slirp.h" 32 #include "net/eth.h" 33 #include "util.h" 34 35 #include "monitor/monitor.h" 36 #include "qemu/help_option.h" 37 #include "qapi/qapi-commands-net.h" 38 #include "qapi/qapi-visit-net.h" 39 #include "qapi/qmp/qdict.h" 40 #include "qapi/qmp/qerror.h" 41 #include "qemu/error-report.h" 42 #include "qemu/sockets.h" 43 #include "qemu/cutils.h" 44 #include "qemu/config-file.h" 45 #include "qemu/ctype.h" 46 #include "qemu/id.h" 47 #include "qemu/iov.h" 48 #include "qemu/qemu-print.h" 49 #include "qemu/main-loop.h" 50 #include "qemu/option.h" 51 #include "qemu/keyval.h" 52 #include "qapi/error.h" 53 #include "qapi/opts-visitor.h" 54 #include "sysemu/runstate.h" 55 #include "net/colo-compare.h" 56 #include "net/filter.h" 57 #include "qapi/string-output-visitor.h" 58 #include "qapi/qobject-input-visitor.h" 59 60 /* Net bridge is currently not supported for W32. */ 61 #if !defined(_WIN32) 62 # define CONFIG_NET_BRIDGE 63 #endif 64 65 static VMChangeStateEntry *net_change_state_entry; 66 NetClientStateList net_clients; 67 68 typedef struct NetdevQueueEntry { 69 Netdev *nd; 70 Location loc; 71 QSIMPLEQ_ENTRY(NetdevQueueEntry) entry; 72 } NetdevQueueEntry; 73 74 typedef QSIMPLEQ_HEAD(, NetdevQueueEntry) NetdevQueue; 75 76 static NetdevQueue nd_queue = QSIMPLEQ_HEAD_INITIALIZER(nd_queue); 77 78 /***********************************************************/ 79 /* network device redirectors */ 80 81 int convert_host_port(struct sockaddr_in *saddr, const char *host, 82 const char *port, Error **errp) 83 { 84 struct hostent *he; 85 const char *r; 86 long p; 87 88 memset(saddr, 0, sizeof(*saddr)); 89 90 saddr->sin_family = AF_INET; 91 if (host[0] == '\0') { 92 saddr->sin_addr.s_addr = 0; 93 } else { 94 if (qemu_isdigit(host[0])) { 95 if (!inet_aton(host, &saddr->sin_addr)) { 96 error_setg(errp, "host address '%s' is not a valid " 97 "IPv4 address", host); 98 return -1; 99 } 100 } else { 101 he = gethostbyname(host); 102 if (he == NULL) { 103 error_setg(errp, "can't resolve host address '%s'", host); 104 return -1; 105 } 106 saddr->sin_addr = *(struct in_addr *)he->h_addr; 107 } 108 } 109 if (qemu_strtol(port, &r, 0, &p) != 0) { 110 error_setg(errp, "port number '%s' is invalid", port); 111 return -1; 112 } 113 saddr->sin_port = htons(p); 114 return 0; 115 } 116 117 int parse_host_port(struct sockaddr_in *saddr, const char *str, 118 Error **errp) 119 { 120 gchar **substrings; 121 int ret; 122 123 substrings = g_strsplit(str, ":", 2); 124 if (!substrings || !substrings[0] || !substrings[1]) { 125 error_setg(errp, "host address '%s' doesn't contain ':' " 126 "separating host from port", str); 127 ret = -1; 128 goto out; 129 } 130 131 ret = convert_host_port(saddr, substrings[0], substrings[1], errp); 132 133 out: 134 g_strfreev(substrings); 135 return ret; 136 } 137 138 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 139 { 140 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 141 macaddr[0], macaddr[1], macaddr[2], 142 macaddr[3], macaddr[4], macaddr[5]); 143 } 144 145 void qemu_set_info_str(NetClientState *nc, const char *fmt, ...) 146 { 147 va_list ap; 148 149 va_start(ap, fmt); 150 vsnprintf(nc->info_str, sizeof(nc->info_str), fmt, ap); 151 va_end(ap); 152 } 153 154 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 155 { 156 qemu_set_info_str(nc, "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 157 nc->model, macaddr[0], macaddr[1], macaddr[2], 158 macaddr[3], macaddr[4], macaddr[5]); 159 } 160 161 static int mac_table[256] = {0}; 162 163 static void qemu_macaddr_set_used(MACAddr *macaddr) 164 { 165 int index; 166 167 for (index = 0x56; index < 0xFF; index++) { 168 if (macaddr->a[5] == index) { 169 mac_table[index]++; 170 } 171 } 172 } 173 174 static void qemu_macaddr_set_free(MACAddr *macaddr) 175 { 176 int index; 177 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 178 179 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 180 return; 181 } 182 for (index = 0x56; index < 0xFF; index++) { 183 if (macaddr->a[5] == index) { 184 mac_table[index]--; 185 } 186 } 187 } 188 189 static int qemu_macaddr_get_free(void) 190 { 191 int index; 192 193 for (index = 0x56; index < 0xFF; index++) { 194 if (mac_table[index] == 0) { 195 return index; 196 } 197 } 198 199 return -1; 200 } 201 202 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 203 { 204 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 205 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 206 207 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 208 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 209 return; 210 } else { 211 qemu_macaddr_set_used(macaddr); 212 return; 213 } 214 } 215 216 macaddr->a[0] = 0x52; 217 macaddr->a[1] = 0x54; 218 macaddr->a[2] = 0x00; 219 macaddr->a[3] = 0x12; 220 macaddr->a[4] = 0x34; 221 macaddr->a[5] = qemu_macaddr_get_free(); 222 qemu_macaddr_set_used(macaddr); 223 } 224 225 /** 226 * Generate a name for net client 227 * 228 * Only net clients created with the legacy -net option and NICs need this. 229 */ 230 static char *assign_name(NetClientState *nc1, const char *model) 231 { 232 NetClientState *nc; 233 int id = 0; 234 235 QTAILQ_FOREACH(nc, &net_clients, next) { 236 if (nc == nc1) { 237 continue; 238 } 239 if (strcmp(nc->model, model) == 0) { 240 id++; 241 } 242 } 243 244 return g_strdup_printf("%s.%d", model, id); 245 } 246 247 static void qemu_net_client_destructor(NetClientState *nc) 248 { 249 g_free(nc); 250 } 251 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 252 unsigned flags, 253 const struct iovec *iov, 254 int iovcnt, 255 void *opaque); 256 257 static void qemu_net_client_setup(NetClientState *nc, 258 NetClientInfo *info, 259 NetClientState *peer, 260 const char *model, 261 const char *name, 262 NetClientDestructor *destructor, 263 bool is_datapath) 264 { 265 nc->info = info; 266 nc->model = g_strdup(model); 267 if (name) { 268 nc->name = g_strdup(name); 269 } else { 270 nc->name = assign_name(nc, model); 271 } 272 273 if (peer) { 274 assert(!peer->peer); 275 nc->peer = peer; 276 peer->peer = nc; 277 } 278 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 279 280 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 281 nc->destructor = destructor; 282 nc->is_datapath = is_datapath; 283 QTAILQ_INIT(&nc->filters); 284 } 285 286 NetClientState *qemu_new_net_client(NetClientInfo *info, 287 NetClientState *peer, 288 const char *model, 289 const char *name) 290 { 291 NetClientState *nc; 292 293 assert(info->size >= sizeof(NetClientState)); 294 295 nc = g_malloc0(info->size); 296 qemu_net_client_setup(nc, info, peer, model, name, 297 qemu_net_client_destructor, true); 298 299 return nc; 300 } 301 302 NetClientState *qemu_new_net_control_client(NetClientInfo *info, 303 NetClientState *peer, 304 const char *model, 305 const char *name) 306 { 307 NetClientState *nc; 308 309 assert(info->size >= sizeof(NetClientState)); 310 311 nc = g_malloc0(info->size); 312 qemu_net_client_setup(nc, info, peer, model, name, 313 qemu_net_client_destructor, false); 314 315 return nc; 316 } 317 318 NICState *qemu_new_nic(NetClientInfo *info, 319 NICConf *conf, 320 const char *model, 321 const char *name, 322 MemReentrancyGuard *reentrancy_guard, 323 void *opaque) 324 { 325 NetClientState **peers = conf->peers.ncs; 326 NICState *nic; 327 int i, queues = MAX(1, conf->peers.queues); 328 329 assert(info->type == NET_CLIENT_DRIVER_NIC); 330 assert(info->size >= sizeof(NICState)); 331 332 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 333 nic->ncs = (void *)nic + info->size; 334 nic->conf = conf; 335 nic->opaque = opaque; 336 337 for (i = 0; i < queues; i++) { 338 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 339 NULL, true); 340 nic->ncs[i].queue_index = i; 341 } 342 343 return nic; 344 } 345 346 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 347 { 348 return nic->ncs + queue_index; 349 } 350 351 NetClientState *qemu_get_queue(NICState *nic) 352 { 353 return qemu_get_subqueue(nic, 0); 354 } 355 356 NICState *qemu_get_nic(NetClientState *nc) 357 { 358 NetClientState *nc0 = nc - nc->queue_index; 359 360 return (NICState *)((void *)nc0 - nc->info->size); 361 } 362 363 void *qemu_get_nic_opaque(NetClientState *nc) 364 { 365 NICState *nic = qemu_get_nic(nc); 366 367 return nic->opaque; 368 } 369 370 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 371 { 372 assert(nc != NULL); 373 NetClientState *ncs = nc + queue_index; 374 return ncs->peer; 375 } 376 377 static void qemu_cleanup_net_client(NetClientState *nc) 378 { 379 QTAILQ_REMOVE(&net_clients, nc, next); 380 381 if (nc->info->cleanup) { 382 nc->info->cleanup(nc); 383 } 384 } 385 386 static void qemu_free_net_client(NetClientState *nc) 387 { 388 if (nc->incoming_queue) { 389 qemu_del_net_queue(nc->incoming_queue); 390 } 391 if (nc->peer) { 392 nc->peer->peer = NULL; 393 } 394 g_free(nc->name); 395 g_free(nc->model); 396 if (nc->destructor) { 397 nc->destructor(nc); 398 } 399 } 400 401 void qemu_del_net_client(NetClientState *nc) 402 { 403 NetClientState *ncs[MAX_QUEUE_NUM]; 404 int queues, i; 405 NetFilterState *nf, *next; 406 407 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 408 409 /* If the NetClientState belongs to a multiqueue backend, we will change all 410 * other NetClientStates also. 411 */ 412 queues = qemu_find_net_clients_except(nc->name, ncs, 413 NET_CLIENT_DRIVER_NIC, 414 MAX_QUEUE_NUM); 415 assert(queues != 0); 416 417 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 418 object_unparent(OBJECT(nf)); 419 } 420 421 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 422 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 423 NICState *nic = qemu_get_nic(nc->peer); 424 if (nic->peer_deleted) { 425 return; 426 } 427 nic->peer_deleted = true; 428 429 for (i = 0; i < queues; i++) { 430 ncs[i]->peer->link_down = true; 431 } 432 433 if (nc->peer->info->link_status_changed) { 434 nc->peer->info->link_status_changed(nc->peer); 435 } 436 437 for (i = 0; i < queues; i++) { 438 qemu_cleanup_net_client(ncs[i]); 439 } 440 441 return; 442 } 443 444 for (i = 0; i < queues; i++) { 445 qemu_cleanup_net_client(ncs[i]); 446 qemu_free_net_client(ncs[i]); 447 } 448 } 449 450 void qemu_del_nic(NICState *nic) 451 { 452 int i, queues = MAX(nic->conf->peers.queues, 1); 453 454 qemu_macaddr_set_free(&nic->conf->macaddr); 455 456 for (i = 0; i < queues; i++) { 457 NetClientState *nc = qemu_get_subqueue(nic, i); 458 /* If this is a peer NIC and peer has already been deleted, free it now. */ 459 if (nic->peer_deleted) { 460 qemu_free_net_client(nc->peer); 461 } else if (nc->peer) { 462 /* if there are RX packets pending, complete them */ 463 qemu_purge_queued_packets(nc->peer); 464 } 465 } 466 467 for (i = queues - 1; i >= 0; i--) { 468 NetClientState *nc = qemu_get_subqueue(nic, i); 469 470 qemu_cleanup_net_client(nc); 471 qemu_free_net_client(nc); 472 } 473 474 g_free(nic); 475 } 476 477 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 478 { 479 NetClientState *nc; 480 481 QTAILQ_FOREACH(nc, &net_clients, next) { 482 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 483 if (nc->queue_index == 0) { 484 func(qemu_get_nic(nc), opaque); 485 } 486 } 487 } 488 } 489 490 bool qemu_has_ufo(NetClientState *nc) 491 { 492 if (!nc || !nc->info->has_ufo) { 493 return false; 494 } 495 496 return nc->info->has_ufo(nc); 497 } 498 499 bool qemu_has_uso(NetClientState *nc) 500 { 501 if (!nc || !nc->info->has_uso) { 502 return false; 503 } 504 505 return nc->info->has_uso(nc); 506 } 507 508 bool qemu_has_vnet_hdr(NetClientState *nc) 509 { 510 if (!nc || !nc->info->has_vnet_hdr) { 511 return false; 512 } 513 514 return nc->info->has_vnet_hdr(nc); 515 } 516 517 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 518 { 519 if (!nc || !nc->info->has_vnet_hdr_len) { 520 return false; 521 } 522 523 return nc->info->has_vnet_hdr_len(nc, len); 524 } 525 526 bool qemu_get_using_vnet_hdr(NetClientState *nc) 527 { 528 if (!nc || !nc->info->get_using_vnet_hdr) { 529 return false; 530 } 531 532 return nc->info->get_using_vnet_hdr(nc); 533 } 534 535 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 536 { 537 if (!nc || !nc->info->using_vnet_hdr) { 538 return; 539 } 540 541 nc->info->using_vnet_hdr(nc, enable); 542 } 543 544 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 545 int ecn, int ufo, int uso4, int uso6) 546 { 547 if (!nc || !nc->info->set_offload) { 548 return; 549 } 550 551 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo, uso4, uso6); 552 } 553 554 int qemu_get_vnet_hdr_len(NetClientState *nc) 555 { 556 if (!nc || !nc->info->get_vnet_hdr_len) { 557 return 0; 558 } 559 560 return nc->info->get_vnet_hdr_len(nc); 561 } 562 563 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 564 { 565 if (!nc || !nc->info->set_vnet_hdr_len) { 566 return; 567 } 568 569 nc->vnet_hdr_len = len; 570 nc->info->set_vnet_hdr_len(nc, len); 571 } 572 573 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 574 { 575 #if HOST_BIG_ENDIAN 576 if (!nc || !nc->info->set_vnet_le) { 577 return -ENOSYS; 578 } 579 580 return nc->info->set_vnet_le(nc, is_le); 581 #else 582 return 0; 583 #endif 584 } 585 586 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 587 { 588 #if HOST_BIG_ENDIAN 589 return 0; 590 #else 591 if (!nc || !nc->info->set_vnet_be) { 592 return -ENOSYS; 593 } 594 595 return nc->info->set_vnet_be(nc, is_be); 596 #endif 597 } 598 599 int qemu_can_receive_packet(NetClientState *nc) 600 { 601 if (nc->receive_disabled) { 602 return 0; 603 } else if (nc->info->can_receive && 604 !nc->info->can_receive(nc)) { 605 return 0; 606 } 607 return 1; 608 } 609 610 int qemu_can_send_packet(NetClientState *sender) 611 { 612 int vm_running = runstate_is_running(); 613 614 if (!vm_running) { 615 return 0; 616 } 617 618 if (!sender->peer) { 619 return 1; 620 } 621 622 return qemu_can_receive_packet(sender->peer); 623 } 624 625 static ssize_t filter_receive_iov(NetClientState *nc, 626 NetFilterDirection direction, 627 NetClientState *sender, 628 unsigned flags, 629 const struct iovec *iov, 630 int iovcnt, 631 NetPacketSent *sent_cb) 632 { 633 ssize_t ret = 0; 634 NetFilterState *nf = NULL; 635 636 if (direction == NET_FILTER_DIRECTION_TX) { 637 QTAILQ_FOREACH(nf, &nc->filters, next) { 638 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 639 iovcnt, sent_cb); 640 if (ret) { 641 return ret; 642 } 643 } 644 } else { 645 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 646 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 647 iovcnt, sent_cb); 648 if (ret) { 649 return ret; 650 } 651 } 652 } 653 654 return ret; 655 } 656 657 static ssize_t filter_receive(NetClientState *nc, 658 NetFilterDirection direction, 659 NetClientState *sender, 660 unsigned flags, 661 const uint8_t *data, 662 size_t size, 663 NetPacketSent *sent_cb) 664 { 665 struct iovec iov = { 666 .iov_base = (void *)data, 667 .iov_len = size 668 }; 669 670 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 671 } 672 673 void qemu_purge_queued_packets(NetClientState *nc) 674 { 675 if (!nc->peer) { 676 return; 677 } 678 679 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 680 } 681 682 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 683 { 684 nc->receive_disabled = 0; 685 686 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 687 if (net_hub_flush(nc->peer)) { 688 qemu_notify_event(); 689 } 690 } 691 if (qemu_net_queue_flush(nc->incoming_queue)) { 692 /* We emptied the queue successfully, signal to the IO thread to repoll 693 * the file descriptor (for tap, for example). 694 */ 695 qemu_notify_event(); 696 } else if (purge) { 697 /* Unable to empty the queue, purge remaining packets */ 698 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 699 } 700 } 701 702 void qemu_flush_queued_packets(NetClientState *nc) 703 { 704 qemu_flush_or_purge_queued_packets(nc, false); 705 } 706 707 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 708 unsigned flags, 709 const uint8_t *buf, int size, 710 NetPacketSent *sent_cb) 711 { 712 NetQueue *queue; 713 int ret; 714 715 #ifdef DEBUG_NET 716 printf("qemu_send_packet_async:\n"); 717 qemu_hexdump(stdout, "net", buf, size); 718 #endif 719 720 if (sender->link_down || !sender->peer) { 721 return size; 722 } 723 724 /* Let filters handle the packet first */ 725 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 726 sender, flags, buf, size, sent_cb); 727 if (ret) { 728 return ret; 729 } 730 731 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 732 sender, flags, buf, size, sent_cb); 733 if (ret) { 734 return ret; 735 } 736 737 queue = sender->peer->incoming_queue; 738 739 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 740 } 741 742 ssize_t qemu_send_packet_async(NetClientState *sender, 743 const uint8_t *buf, int size, 744 NetPacketSent *sent_cb) 745 { 746 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 747 buf, size, sent_cb); 748 } 749 750 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 751 { 752 return qemu_send_packet_async(nc, buf, size, NULL); 753 } 754 755 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 756 { 757 if (!qemu_can_receive_packet(nc)) { 758 return 0; 759 } 760 761 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 762 } 763 764 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 765 int iovcnt) 766 { 767 if (!qemu_can_receive_packet(nc)) { 768 return 0; 769 } 770 771 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 772 } 773 774 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 775 { 776 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 777 buf, size, NULL); 778 } 779 780 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 781 int iovcnt, unsigned flags) 782 { 783 uint8_t *buf = NULL; 784 uint8_t *buffer; 785 size_t offset; 786 ssize_t ret; 787 788 if (iovcnt == 1) { 789 buffer = iov[0].iov_base; 790 offset = iov[0].iov_len; 791 } else { 792 offset = iov_size(iov, iovcnt); 793 if (offset > NET_BUFSIZE) { 794 return -1; 795 } 796 buf = g_malloc(offset); 797 buffer = buf; 798 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 799 } 800 801 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 802 ret = nc->info->receive_raw(nc, buffer, offset); 803 } else { 804 ret = nc->info->receive(nc, buffer, offset); 805 } 806 807 g_free(buf); 808 return ret; 809 } 810 811 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 812 unsigned flags, 813 const struct iovec *iov, 814 int iovcnt, 815 void *opaque) 816 { 817 NetClientState *nc = opaque; 818 int ret; 819 820 821 if (nc->link_down) { 822 return iov_size(iov, iovcnt); 823 } 824 825 if (nc->receive_disabled) { 826 return 0; 827 } 828 829 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 830 ret = nc->info->receive_iov(nc, iov, iovcnt); 831 } else { 832 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 833 } 834 835 if (ret == 0) { 836 nc->receive_disabled = 1; 837 } 838 839 return ret; 840 } 841 842 ssize_t qemu_sendv_packet_async(NetClientState *sender, 843 const struct iovec *iov, int iovcnt, 844 NetPacketSent *sent_cb) 845 { 846 NetQueue *queue; 847 size_t size = iov_size(iov, iovcnt); 848 int ret; 849 850 if (size > NET_BUFSIZE) { 851 return size; 852 } 853 854 if (sender->link_down || !sender->peer) { 855 return size; 856 } 857 858 /* Let filters handle the packet first */ 859 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 860 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 861 if (ret) { 862 return ret; 863 } 864 865 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 866 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 867 if (ret) { 868 return ret; 869 } 870 871 queue = sender->peer->incoming_queue; 872 873 return qemu_net_queue_send_iov(queue, sender, 874 QEMU_NET_PACKET_FLAG_NONE, 875 iov, iovcnt, sent_cb); 876 } 877 878 ssize_t 879 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 880 { 881 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 882 } 883 884 NetClientState *qemu_find_netdev(const char *id) 885 { 886 NetClientState *nc; 887 888 QTAILQ_FOREACH(nc, &net_clients, next) { 889 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 890 continue; 891 if (!strcmp(nc->name, id)) { 892 return nc; 893 } 894 } 895 896 return NULL; 897 } 898 899 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 900 NetClientDriver type, int max) 901 { 902 NetClientState *nc; 903 int ret = 0; 904 905 QTAILQ_FOREACH(nc, &net_clients, next) { 906 if (nc->info->type == type) { 907 continue; 908 } 909 if (!id || !strcmp(nc->name, id)) { 910 if (ret < max) { 911 ncs[ret] = nc; 912 } 913 ret++; 914 } 915 } 916 917 return ret; 918 } 919 920 static int nic_get_free_idx(void) 921 { 922 int index; 923 924 for (index = 0; index < MAX_NICS; index++) 925 if (!nd_table[index].used) 926 return index; 927 return -1; 928 } 929 930 GPtrArray *qemu_get_nic_models(const char *device_type) 931 { 932 GPtrArray *nic_models = g_ptr_array_new(); 933 GSList *list = object_class_get_list_sorted(device_type, false); 934 935 while (list) { 936 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data, 937 TYPE_DEVICE); 938 GSList *next; 939 if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) && 940 dc->user_creatable) { 941 const char *name = object_class_get_name(list->data); 942 /* 943 * A network device might also be something else than a NIC, see 944 * e.g. the "rocker" device. Thus we have to look for the "netdev" 945 * property, too. Unfortunately, some devices like virtio-net only 946 * create this property during instance_init, so we have to create 947 * a temporary instance here to be able to check it. 948 */ 949 Object *obj = object_new_with_class(OBJECT_CLASS(dc)); 950 if (object_property_find(obj, "netdev")) { 951 g_ptr_array_add(nic_models, (gpointer)name); 952 } 953 object_unref(obj); 954 } 955 next = list->next; 956 g_slist_free_1(list); 957 list = next; 958 } 959 g_ptr_array_add(nic_models, NULL); 960 961 return nic_models; 962 } 963 964 int qemu_show_nic_models(const char *arg, const char *const *models) 965 { 966 int i; 967 968 if (!arg || !is_help_option(arg)) { 969 return 0; 970 } 971 972 printf("Available NIC models:\n"); 973 for (i = 0 ; models[i]; i++) { 974 printf("%s\n", models[i]); 975 } 976 return 1; 977 } 978 979 void qemu_check_nic_model(NICInfo *nd, const char *model) 980 { 981 const char *models[2]; 982 983 models[0] = model; 984 models[1] = NULL; 985 986 if (qemu_show_nic_models(nd->model, models)) 987 exit(0); 988 if (qemu_find_nic_model(nd, models, model) < 0) 989 exit(1); 990 } 991 992 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 993 const char *default_model) 994 { 995 int i; 996 997 if (!nd->model) 998 nd->model = g_strdup(default_model); 999 1000 for (i = 0 ; models[i]; i++) { 1001 if (strcmp(nd->model, models[i]) == 0) 1002 return i; 1003 } 1004 1005 error_report("Unsupported NIC model: %s", nd->model); 1006 return -1; 1007 } 1008 1009 static int net_init_nic(const Netdev *netdev, const char *name, 1010 NetClientState *peer, Error **errp) 1011 { 1012 int idx; 1013 NICInfo *nd; 1014 const NetLegacyNicOptions *nic; 1015 1016 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 1017 nic = &netdev->u.nic; 1018 1019 idx = nic_get_free_idx(); 1020 if (idx == -1 || nb_nics >= MAX_NICS) { 1021 error_setg(errp, "too many NICs"); 1022 return -1; 1023 } 1024 1025 nd = &nd_table[idx]; 1026 1027 memset(nd, 0, sizeof(*nd)); 1028 1029 if (nic->netdev) { 1030 nd->netdev = qemu_find_netdev(nic->netdev); 1031 if (!nd->netdev) { 1032 error_setg(errp, "netdev '%s' not found", nic->netdev); 1033 return -1; 1034 } 1035 } else { 1036 assert(peer); 1037 nd->netdev = peer; 1038 } 1039 nd->name = g_strdup(name); 1040 if (nic->model) { 1041 nd->model = g_strdup(nic->model); 1042 } 1043 if (nic->addr) { 1044 nd->devaddr = g_strdup(nic->addr); 1045 } 1046 1047 if (nic->macaddr && 1048 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 1049 error_setg(errp, "invalid syntax for ethernet address"); 1050 return -1; 1051 } 1052 if (nic->macaddr && 1053 is_multicast_ether_addr(nd->macaddr.a)) { 1054 error_setg(errp, 1055 "NIC cannot have multicast MAC address (odd 1st byte)"); 1056 return -1; 1057 } 1058 qemu_macaddr_default_if_unset(&nd->macaddr); 1059 1060 if (nic->has_vectors) { 1061 if (nic->vectors > 0x7ffffff) { 1062 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 1063 return -1; 1064 } 1065 nd->nvectors = nic->vectors; 1066 } else { 1067 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 1068 } 1069 1070 nd->used = 1; 1071 nb_nics++; 1072 1073 return idx; 1074 } 1075 1076 1077 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 1078 const Netdev *netdev, 1079 const char *name, 1080 NetClientState *peer, Error **errp) = { 1081 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 1082 #ifdef CONFIG_SLIRP 1083 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1084 #endif 1085 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1086 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1087 [NET_CLIENT_DRIVER_STREAM] = net_init_stream, 1088 [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, 1089 #ifdef CONFIG_VDE 1090 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1091 #endif 1092 #ifdef CONFIG_NETMAP 1093 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1094 #endif 1095 #ifdef CONFIG_AF_XDP 1096 [NET_CLIENT_DRIVER_AF_XDP] = net_init_af_xdp, 1097 #endif 1098 #ifdef CONFIG_NET_BRIDGE 1099 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1100 #endif 1101 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1102 #ifdef CONFIG_VHOST_NET_USER 1103 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1104 #endif 1105 #ifdef CONFIG_VHOST_NET_VDPA 1106 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1107 #endif 1108 #ifdef CONFIG_L2TPV3 1109 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1110 #endif 1111 #ifdef CONFIG_VMNET 1112 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1113 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1114 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1115 #endif /* CONFIG_VMNET */ 1116 }; 1117 1118 1119 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1120 { 1121 NetClientState *peer = NULL; 1122 NetClientState *nc; 1123 1124 if (is_netdev) { 1125 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1126 !net_client_init_fun[netdev->type]) { 1127 error_setg(errp, "network backend '%s' is not compiled into this binary", 1128 NetClientDriver_str(netdev->type)); 1129 return -1; 1130 } 1131 } else { 1132 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1133 return 0; /* nothing to do */ 1134 } 1135 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { 1136 error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", 1137 NetClientDriver_str(netdev->type)); 1138 return -1; 1139 } 1140 1141 if (!net_client_init_fun[netdev->type]) { 1142 error_setg(errp, "network backend '%s' is not compiled into this binary", 1143 NetClientDriver_str(netdev->type)); 1144 return -1; 1145 } 1146 1147 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1148 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1149 !netdev->u.nic.netdev) { 1150 peer = net_hub_add_port(0, NULL, NULL); 1151 } 1152 } 1153 1154 nc = qemu_find_netdev(netdev->id); 1155 if (nc) { 1156 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1157 return -1; 1158 } 1159 1160 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1161 /* FIXME drop when all init functions store an Error */ 1162 if (errp && !*errp) { 1163 error_setg(errp, "Device '%s' could not be initialized", 1164 NetClientDriver_str(netdev->type)); 1165 } 1166 return -1; 1167 } 1168 1169 if (is_netdev) { 1170 nc = qemu_find_netdev(netdev->id); 1171 assert(nc); 1172 nc->is_netdev = true; 1173 } 1174 1175 return 0; 1176 } 1177 1178 void show_netdevs(void) 1179 { 1180 int idx; 1181 const char *available_netdevs[] = { 1182 "socket", 1183 "stream", 1184 "dgram", 1185 "hubport", 1186 "tap", 1187 #ifdef CONFIG_SLIRP 1188 "user", 1189 #endif 1190 #ifdef CONFIG_L2TPV3 1191 "l2tpv3", 1192 #endif 1193 #ifdef CONFIG_VDE 1194 "vde", 1195 #endif 1196 #ifdef CONFIG_NET_BRIDGE 1197 "bridge", 1198 #endif 1199 #ifdef CONFIG_NETMAP 1200 "netmap", 1201 #endif 1202 #ifdef CONFIG_AF_XDP 1203 "af-xdp", 1204 #endif 1205 #ifdef CONFIG_POSIX 1206 "vhost-user", 1207 #endif 1208 #ifdef CONFIG_VHOST_VDPA 1209 "vhost-vdpa", 1210 #endif 1211 #ifdef CONFIG_VMNET 1212 "vmnet-host", 1213 "vmnet-shared", 1214 "vmnet-bridged", 1215 #endif 1216 }; 1217 1218 qemu_printf("Available netdev backend types:\n"); 1219 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1220 qemu_printf("%s\n", available_netdevs[idx]); 1221 } 1222 } 1223 1224 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1225 { 1226 gchar **substrings = NULL; 1227 Netdev *object = NULL; 1228 int ret = -1; 1229 Visitor *v = opts_visitor_new(opts); 1230 1231 /* Parse convenience option format ipv6-net=fec0::0[/64] */ 1232 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1233 1234 if (ip6_net) { 1235 char *prefix_addr; 1236 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1237 1238 substrings = g_strsplit(ip6_net, "/", 2); 1239 if (!substrings || !substrings[0]) { 1240 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1241 "a valid IPv6 prefix"); 1242 goto out; 1243 } 1244 1245 prefix_addr = substrings[0]; 1246 1247 /* Handle user-specified prefix length. */ 1248 if (substrings[1] && 1249 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1250 { 1251 error_setg(errp, 1252 "parameter 'ipv6-net' expects a number after '/'"); 1253 goto out; 1254 } 1255 1256 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1257 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1258 &error_abort); 1259 qemu_opt_unset(opts, "ipv6-net"); 1260 } 1261 1262 /* Create an ID for -net if the user did not specify one */ 1263 if (!is_netdev && !qemu_opts_id(opts)) { 1264 qemu_opts_set_id(opts, id_generate(ID_NET)); 1265 } 1266 1267 if (visit_type_Netdev(v, NULL, &object, errp)) { 1268 ret = net_client_init1(object, is_netdev, errp); 1269 } 1270 1271 qapi_free_Netdev(object); 1272 1273 out: 1274 g_strfreev(substrings); 1275 visit_free(v); 1276 return ret; 1277 } 1278 1279 void netdev_add(QemuOpts *opts, Error **errp) 1280 { 1281 net_client_init(opts, true, errp); 1282 } 1283 1284 void qmp_netdev_add(Netdev *netdev, Error **errp) 1285 { 1286 if (!id_wellformed(netdev->id)) { 1287 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1288 return; 1289 } 1290 1291 net_client_init1(netdev, true, errp); 1292 } 1293 1294 void qmp_netdev_del(const char *id, Error **errp) 1295 { 1296 NetClientState *nc; 1297 QemuOpts *opts; 1298 1299 nc = qemu_find_netdev(id); 1300 if (!nc) { 1301 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1302 "Device '%s' not found", id); 1303 return; 1304 } 1305 1306 if (!nc->is_netdev) { 1307 error_setg(errp, "Device '%s' is not a netdev", id); 1308 return; 1309 } 1310 1311 qemu_del_net_client(nc); 1312 1313 /* 1314 * Wart: we need to delete the QemuOpts associated with netdevs 1315 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1316 * HMP netdev_add. 1317 */ 1318 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1319 if (opts) { 1320 qemu_opts_del(opts); 1321 } 1322 } 1323 1324 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1325 { 1326 char *str; 1327 ObjectProperty *prop; 1328 ObjectPropertyIterator iter; 1329 Visitor *v; 1330 1331 /* generate info str */ 1332 object_property_iter_init(&iter, OBJECT(nf)); 1333 while ((prop = object_property_iter_next(&iter))) { 1334 if (!strcmp(prop->name, "type")) { 1335 continue; 1336 } 1337 v = string_output_visitor_new(false, &str); 1338 object_property_get(OBJECT(nf), prop->name, v, NULL); 1339 visit_complete(v, &str); 1340 visit_free(v); 1341 monitor_printf(mon, ",%s=%s", prop->name, str); 1342 g_free(str); 1343 } 1344 monitor_printf(mon, "\n"); 1345 } 1346 1347 void print_net_client(Monitor *mon, NetClientState *nc) 1348 { 1349 NetFilterState *nf; 1350 1351 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1352 nc->queue_index, 1353 NetClientDriver_str(nc->info->type), 1354 nc->info_str); 1355 if (!QTAILQ_EMPTY(&nc->filters)) { 1356 monitor_printf(mon, "filters:\n"); 1357 } 1358 QTAILQ_FOREACH(nf, &nc->filters, next) { 1359 monitor_printf(mon, " - %s: type=%s", 1360 object_get_canonical_path_component(OBJECT(nf)), 1361 object_get_typename(OBJECT(nf))); 1362 netfilter_print_info(mon, nf); 1363 } 1364 } 1365 1366 RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp) 1367 { 1368 NetClientState *nc; 1369 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1370 1371 QTAILQ_FOREACH(nc, &net_clients, next) { 1372 RxFilterInfo *info; 1373 1374 if (name && strcmp(nc->name, name) != 0) { 1375 continue; 1376 } 1377 1378 /* only query rx-filter information of NIC */ 1379 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1380 if (name) { 1381 error_setg(errp, "net client(%s) isn't a NIC", name); 1382 assert(!filter_list); 1383 return NULL; 1384 } 1385 continue; 1386 } 1387 1388 /* only query information on queue 0 since the info is per nic, 1389 * not per queue 1390 */ 1391 if (nc->queue_index != 0) 1392 continue; 1393 1394 if (nc->info->query_rx_filter) { 1395 info = nc->info->query_rx_filter(nc); 1396 QAPI_LIST_APPEND(tail, info); 1397 } else if (name) { 1398 error_setg(errp, "net client(%s) doesn't support" 1399 " rx-filter querying", name); 1400 assert(!filter_list); 1401 return NULL; 1402 } 1403 1404 if (name) { 1405 break; 1406 } 1407 } 1408 1409 if (filter_list == NULL && name) { 1410 error_setg(errp, "invalid net client name: %s", name); 1411 } 1412 1413 return filter_list; 1414 } 1415 1416 void colo_notify_filters_event(int event, Error **errp) 1417 { 1418 NetClientState *nc; 1419 NetFilterState *nf; 1420 NetFilterClass *nfc = NULL; 1421 Error *local_err = NULL; 1422 1423 QTAILQ_FOREACH(nc, &net_clients, next) { 1424 QTAILQ_FOREACH(nf, &nc->filters, next) { 1425 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1426 nfc->handle_event(nf, event, &local_err); 1427 if (local_err) { 1428 error_propagate(errp, local_err); 1429 return; 1430 } 1431 } 1432 } 1433 } 1434 1435 void qmp_set_link(const char *name, bool up, Error **errp) 1436 { 1437 NetClientState *ncs[MAX_QUEUE_NUM]; 1438 NetClientState *nc; 1439 int queues, i; 1440 1441 queues = qemu_find_net_clients_except(name, ncs, 1442 NET_CLIENT_DRIVER__MAX, 1443 MAX_QUEUE_NUM); 1444 1445 if (queues == 0) { 1446 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1447 "Device '%s' not found", name); 1448 return; 1449 } 1450 nc = ncs[0]; 1451 1452 for (i = 0; i < queues; i++) { 1453 ncs[i]->link_down = !up; 1454 } 1455 1456 if (nc->info->link_status_changed) { 1457 nc->info->link_status_changed(nc); 1458 } 1459 1460 if (nc->peer) { 1461 /* Change peer link only if the peer is NIC and then notify peer. 1462 * If the peer is a HUBPORT or a backend, we do not change the 1463 * link status. 1464 * 1465 * This behavior is compatible with qemu hubs where there could be 1466 * multiple clients that can still communicate with each other in 1467 * disconnected mode. For now maintain this compatibility. 1468 */ 1469 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1470 for (i = 0; i < queues; i++) { 1471 ncs[i]->peer->link_down = !up; 1472 } 1473 } 1474 if (nc->peer->info->link_status_changed) { 1475 nc->peer->info->link_status_changed(nc->peer); 1476 } 1477 } 1478 } 1479 1480 static void net_vm_change_state_handler(void *opaque, bool running, 1481 RunState state) 1482 { 1483 NetClientState *nc; 1484 NetClientState *tmp; 1485 1486 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1487 if (running) { 1488 /* Flush queued packets and wake up backends. */ 1489 if (nc->peer && qemu_can_send_packet(nc)) { 1490 qemu_flush_queued_packets(nc->peer); 1491 } 1492 } else { 1493 /* Complete all queued packets, to guarantee we don't modify 1494 * state later when VM is not running. 1495 */ 1496 qemu_flush_or_purge_queued_packets(nc, true); 1497 } 1498 } 1499 } 1500 1501 void net_cleanup(void) 1502 { 1503 NetClientState *nc; 1504 1505 /*cleanup colo compare module for COLO*/ 1506 colo_compare_cleanup(); 1507 1508 /* We may del multiple entries during qemu_del_net_client(), 1509 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1510 */ 1511 while (!QTAILQ_EMPTY(&net_clients)) { 1512 nc = QTAILQ_FIRST(&net_clients); 1513 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1514 qemu_del_nic(qemu_get_nic(nc)); 1515 } else { 1516 qemu_del_net_client(nc); 1517 } 1518 } 1519 1520 qemu_del_vm_change_state_handler(net_change_state_entry); 1521 } 1522 1523 void net_check_clients(void) 1524 { 1525 NetClientState *nc; 1526 int i; 1527 1528 net_hub_check_clients(); 1529 1530 QTAILQ_FOREACH(nc, &net_clients, next) { 1531 if (!nc->peer) { 1532 warn_report("%s %s has no peer", 1533 nc->info->type == NET_CLIENT_DRIVER_NIC 1534 ? "nic" : "netdev", 1535 nc->name); 1536 } 1537 } 1538 1539 /* Check that all NICs requested via -net nic actually got created. 1540 * NICs created via -device don't need to be checked here because 1541 * they are always instantiated. 1542 */ 1543 for (i = 0; i < MAX_NICS; i++) { 1544 NICInfo *nd = &nd_table[i]; 1545 if (nd->used && !nd->instantiated) { 1546 warn_report("requested NIC (%s, model %s) " 1547 "was not created (not supported by this machine?)", 1548 nd->name ? nd->name : "anonymous", 1549 nd->model ? nd->model : "unspecified"); 1550 } 1551 } 1552 } 1553 1554 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1555 { 1556 return net_client_init(opts, false, errp); 1557 } 1558 1559 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1560 { 1561 const char *type = qemu_opt_get(opts, "type"); 1562 1563 if (type && is_help_option(type)) { 1564 show_netdevs(); 1565 exit(0); 1566 } 1567 return net_client_init(opts, true, errp); 1568 } 1569 1570 /* For the convenience "--nic" parameter */ 1571 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1572 { 1573 char *mac, *nd_id; 1574 int idx, ret; 1575 NICInfo *ni; 1576 const char *type; 1577 1578 type = qemu_opt_get(opts, "type"); 1579 if (type) { 1580 if (g_str_equal(type, "none")) { 1581 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1582 } 1583 if (is_help_option(type)) { 1584 GPtrArray *nic_models = qemu_get_nic_models(TYPE_DEVICE); 1585 show_netdevs(); 1586 printf("\n"); 1587 qemu_show_nic_models(type, (const char **)nic_models->pdata); 1588 g_ptr_array_free(nic_models, true); 1589 exit(0); 1590 } 1591 } 1592 1593 idx = nic_get_free_idx(); 1594 if (idx == -1 || nb_nics >= MAX_NICS) { 1595 error_setg(errp, "no more on-board/default NIC slots available"); 1596 return -1; 1597 } 1598 1599 if (!type) { 1600 qemu_opt_set(opts, "type", "user", &error_abort); 1601 } 1602 1603 ni = &nd_table[idx]; 1604 memset(ni, 0, sizeof(*ni)); 1605 ni->model = qemu_opt_get_del(opts, "model"); 1606 1607 /* Create an ID if the user did not specify one */ 1608 nd_id = g_strdup(qemu_opts_id(opts)); 1609 if (!nd_id) { 1610 nd_id = id_generate(ID_NET); 1611 qemu_opts_set_id(opts, nd_id); 1612 } 1613 1614 /* Handle MAC address */ 1615 mac = qemu_opt_get_del(opts, "mac"); 1616 if (mac) { 1617 ret = net_parse_macaddr(ni->macaddr.a, mac); 1618 g_free(mac); 1619 if (ret) { 1620 error_setg(errp, "invalid syntax for ethernet address"); 1621 goto out; 1622 } 1623 if (is_multicast_ether_addr(ni->macaddr.a)) { 1624 error_setg(errp, "NIC cannot have multicast MAC address"); 1625 ret = -1; 1626 goto out; 1627 } 1628 } 1629 qemu_macaddr_default_if_unset(&ni->macaddr); 1630 1631 ret = net_client_init(opts, true, errp); 1632 if (ret == 0) { 1633 ni->netdev = qemu_find_netdev(nd_id); 1634 ni->used = true; 1635 nb_nics++; 1636 } 1637 1638 out: 1639 g_free(nd_id); 1640 return ret; 1641 } 1642 1643 static void netdev_init_modern(void) 1644 { 1645 while (!QSIMPLEQ_EMPTY(&nd_queue)) { 1646 NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); 1647 1648 QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); 1649 loc_push_restore(&nd->loc); 1650 net_client_init1(nd->nd, true, &error_fatal); 1651 loc_pop(&nd->loc); 1652 qapi_free_Netdev(nd->nd); 1653 g_free(nd); 1654 } 1655 } 1656 1657 void net_init_clients(void) 1658 { 1659 net_change_state_entry = 1660 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1661 1662 QTAILQ_INIT(&net_clients); 1663 1664 netdev_init_modern(); 1665 1666 qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1667 &error_fatal); 1668 1669 qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, 1670 &error_fatal); 1671 1672 qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, 1673 &error_fatal); 1674 } 1675 1676 /* 1677 * Does this -netdev argument use modern rather than traditional syntax? 1678 * Modern syntax is to be parsed with netdev_parse_modern(). 1679 * Traditional syntax is to be parsed with net_client_parse(). 1680 */ 1681 bool netdev_is_modern(const char *optstr) 1682 { 1683 QemuOpts *opts; 1684 bool is_modern; 1685 const char *type; 1686 static QemuOptsList dummy_opts = { 1687 .name = "netdev", 1688 .implied_opt_name = "type", 1689 .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), 1690 .desc = { { } }, 1691 }; 1692 1693 if (optstr[0] == '{') { 1694 /* This is JSON, which means it's modern syntax */ 1695 return true; 1696 } 1697 1698 opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); 1699 qemu_opts_do_parse(opts, optstr, dummy_opts.implied_opt_name, 1700 &error_abort); 1701 type = qemu_opt_get(opts, "type"); 1702 is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); 1703 1704 qemu_opts_reset(&dummy_opts); 1705 1706 return is_modern; 1707 } 1708 1709 /* 1710 * netdev_parse_modern() uses modern, more expressive syntax than 1711 * net_client_parse(), but supports only the -netdev option. 1712 * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() 1713 * appends to @qemu_netdev_opts. 1714 */ 1715 void netdev_parse_modern(const char *optstr) 1716 { 1717 Visitor *v; 1718 NetdevQueueEntry *nd; 1719 1720 v = qobject_input_visitor_new_str(optstr, "type", &error_fatal); 1721 nd = g_new(NetdevQueueEntry, 1); 1722 visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); 1723 visit_free(v); 1724 loc_save(&nd->loc); 1725 1726 QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); 1727 } 1728 1729 void net_client_parse(QemuOptsList *opts_list, const char *optstr) 1730 { 1731 if (!qemu_opts_parse_noisily(opts_list, optstr, true)) { 1732 exit(1); 1733 } 1734 } 1735 1736 /* From FreeBSD */ 1737 /* XXX: optimize */ 1738 uint32_t net_crc32(const uint8_t *p, int len) 1739 { 1740 uint32_t crc; 1741 int carry, i, j; 1742 uint8_t b; 1743 1744 crc = 0xffffffff; 1745 for (i = 0; i < len; i++) { 1746 b = *p++; 1747 for (j = 0; j < 8; j++) { 1748 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1749 crc <<= 1; 1750 b >>= 1; 1751 if (carry) { 1752 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1753 } 1754 } 1755 } 1756 1757 return crc; 1758 } 1759 1760 uint32_t net_crc32_le(const uint8_t *p, int len) 1761 { 1762 uint32_t crc; 1763 int carry, i, j; 1764 uint8_t b; 1765 1766 crc = 0xffffffff; 1767 for (i = 0; i < len; i++) { 1768 b = *p++; 1769 for (j = 0; j < 8; j++) { 1770 carry = (crc & 0x1) ^ (b & 0x01); 1771 crc >>= 1; 1772 b >>= 1; 1773 if (carry) { 1774 crc ^= POLYNOMIAL_LE; 1775 } 1776 } 1777 } 1778 1779 return crc; 1780 } 1781 1782 QemuOptsList qemu_netdev_opts = { 1783 .name = "netdev", 1784 .implied_opt_name = "type", 1785 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1786 .desc = { 1787 /* 1788 * no elements => accept any params 1789 * validation will happen later 1790 */ 1791 { /* end of list */ } 1792 }, 1793 }; 1794 1795 QemuOptsList qemu_nic_opts = { 1796 .name = "nic", 1797 .implied_opt_name = "type", 1798 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1799 .desc = { 1800 /* 1801 * no elements => accept any params 1802 * validation will happen later 1803 */ 1804 { /* end of list */ } 1805 }, 1806 }; 1807 1808 QemuOptsList qemu_net_opts = { 1809 .name = "net", 1810 .implied_opt_name = "type", 1811 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1812 .desc = { 1813 /* 1814 * no elements => accept any params 1815 * validation will happen later 1816 */ 1817 { /* end of list */ } 1818 }, 1819 }; 1820 1821 void net_socket_rs_init(SocketReadState *rs, 1822 SocketReadStateFinalize *finalize, 1823 bool vnet_hdr) 1824 { 1825 rs->state = 0; 1826 rs->vnet_hdr = vnet_hdr; 1827 rs->index = 0; 1828 rs->packet_len = 0; 1829 rs->vnet_hdr_len = 0; 1830 memset(rs->buf, 0, sizeof(rs->buf)); 1831 rs->finalize = finalize; 1832 } 1833 1834 /* 1835 * Returns 1836 * 0: success 1837 * -1: error occurs 1838 */ 1839 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1840 { 1841 unsigned int l; 1842 1843 while (size > 0) { 1844 /* Reassemble a packet from the network. 1845 * 0 = getting length. 1846 * 1 = getting vnet header length. 1847 * 2 = getting data. 1848 */ 1849 switch (rs->state) { 1850 case 0: 1851 l = 4 - rs->index; 1852 if (l > size) { 1853 l = size; 1854 } 1855 memcpy(rs->buf + rs->index, buf, l); 1856 buf += l; 1857 size -= l; 1858 rs->index += l; 1859 if (rs->index == 4) { 1860 /* got length */ 1861 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1862 rs->index = 0; 1863 if (rs->vnet_hdr) { 1864 rs->state = 1; 1865 } else { 1866 rs->state = 2; 1867 rs->vnet_hdr_len = 0; 1868 } 1869 } 1870 break; 1871 case 1: 1872 l = 4 - rs->index; 1873 if (l > size) { 1874 l = size; 1875 } 1876 memcpy(rs->buf + rs->index, buf, l); 1877 buf += l; 1878 size -= l; 1879 rs->index += l; 1880 if (rs->index == 4) { 1881 /* got vnet header length */ 1882 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1883 rs->index = 0; 1884 rs->state = 2; 1885 } 1886 break; 1887 case 2: 1888 l = rs->packet_len - rs->index; 1889 if (l > size) { 1890 l = size; 1891 } 1892 if (rs->index + l <= sizeof(rs->buf)) { 1893 memcpy(rs->buf + rs->index, buf, l); 1894 } else { 1895 fprintf(stderr, "serious error: oversized packet received," 1896 "connection terminated.\n"); 1897 rs->index = rs->state = 0; 1898 return -1; 1899 } 1900 1901 rs->index += l; 1902 buf += l; 1903 size -= l; 1904 if (rs->index >= rs->packet_len) { 1905 rs->index = 0; 1906 rs->state = 0; 1907 assert(rs->finalize); 1908 rs->finalize(rs); 1909 } 1910 break; 1911 } 1912 } 1913 1914 assert(size == 0); 1915 return 0; 1916 } 1917