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 "qobject/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 "system/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 #include "standard-headers/linux/virtio_net.h" 60 61 /* Net bridge is currently not supported for W32. */ 62 #if !defined(_WIN32) 63 # define CONFIG_NET_BRIDGE 64 #endif 65 66 static VMChangeStateEntry *net_change_state_entry; 67 NetClientStateList net_clients; 68 69 typedef struct NetdevQueueEntry { 70 Netdev *nd; 71 Location loc; 72 QSIMPLEQ_ENTRY(NetdevQueueEntry) entry; 73 } NetdevQueueEntry; 74 75 typedef QSIMPLEQ_HEAD(, NetdevQueueEntry) NetdevQueue; 76 77 static NetdevQueue nd_queue = QSIMPLEQ_HEAD_INITIALIZER(nd_queue); 78 79 static GHashTable *nic_model_help; 80 81 static int nb_nics; 82 static NICInfo nd_table[MAX_NICS]; 83 84 /***********************************************************/ 85 /* network device redirectors */ 86 87 int convert_host_port(struct sockaddr_in *saddr, const char *host, 88 const char *port, Error **errp) 89 { 90 struct hostent *he; 91 const char *r; 92 long p; 93 94 memset(saddr, 0, sizeof(*saddr)); 95 96 saddr->sin_family = AF_INET; 97 if (host[0] == '\0') { 98 saddr->sin_addr.s_addr = 0; 99 } else { 100 if (qemu_isdigit(host[0])) { 101 if (!inet_aton(host, &saddr->sin_addr)) { 102 error_setg(errp, "host address '%s' is not a valid " 103 "IPv4 address", host); 104 return -1; 105 } 106 } else { 107 he = gethostbyname(host); 108 if (he == NULL) { 109 error_setg(errp, "can't resolve host address '%s'", host); 110 return -1; 111 } 112 saddr->sin_addr = *(struct in_addr *)he->h_addr; 113 } 114 } 115 if (qemu_strtol(port, &r, 0, &p) != 0) { 116 error_setg(errp, "port number '%s' is invalid", port); 117 return -1; 118 } 119 saddr->sin_port = htons(p); 120 return 0; 121 } 122 123 int parse_host_port(struct sockaddr_in *saddr, const char *str, 124 Error **errp) 125 { 126 gchar **substrings; 127 int ret; 128 129 substrings = g_strsplit(str, ":", 2); 130 if (!substrings || !substrings[0] || !substrings[1]) { 131 error_setg(errp, "host address '%s' doesn't contain ':' " 132 "separating host from port", str); 133 ret = -1; 134 goto out; 135 } 136 137 ret = convert_host_port(saddr, substrings[0], substrings[1], errp); 138 139 out: 140 g_strfreev(substrings); 141 return ret; 142 } 143 144 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 145 { 146 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 147 macaddr[0], macaddr[1], macaddr[2], 148 macaddr[3], macaddr[4], macaddr[5]); 149 } 150 151 void qemu_set_info_str(NetClientState *nc, const char *fmt, ...) 152 { 153 va_list ap; 154 155 va_start(ap, fmt); 156 vsnprintf(nc->info_str, sizeof(nc->info_str), fmt, ap); 157 va_end(ap); 158 } 159 160 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 161 { 162 qemu_set_info_str(nc, "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 163 nc->model, macaddr[0], macaddr[1], macaddr[2], 164 macaddr[3], macaddr[4], macaddr[5]); 165 } 166 167 static int mac_table[256] = {0}; 168 169 static void qemu_macaddr_set_used(MACAddr *macaddr) 170 { 171 int index; 172 173 for (index = 0x56; index < 0xFF; index++) { 174 if (macaddr->a[5] == index) { 175 mac_table[index]++; 176 } 177 } 178 } 179 180 static void qemu_macaddr_set_free(MACAddr *macaddr) 181 { 182 int index; 183 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 184 185 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 186 return; 187 } 188 for (index = 0x56; index < 0xFF; index++) { 189 if (macaddr->a[5] == index) { 190 mac_table[index]--; 191 } 192 } 193 } 194 195 static int qemu_macaddr_get_free(void) 196 { 197 int index; 198 199 for (index = 0x56; index < 0xFF; index++) { 200 if (mac_table[index] == 0) { 201 return index; 202 } 203 } 204 205 return -1; 206 } 207 208 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 209 { 210 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 211 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 212 213 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 214 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 215 return; 216 } else { 217 qemu_macaddr_set_used(macaddr); 218 return; 219 } 220 } 221 222 macaddr->a[0] = 0x52; 223 macaddr->a[1] = 0x54; 224 macaddr->a[2] = 0x00; 225 macaddr->a[3] = 0x12; 226 macaddr->a[4] = 0x34; 227 macaddr->a[5] = qemu_macaddr_get_free(); 228 qemu_macaddr_set_used(macaddr); 229 } 230 231 /** 232 * Generate a name for net client 233 * 234 * Only net clients created with the legacy -net option and NICs need this. 235 */ 236 static char *assign_name(NetClientState *nc1, const char *model) 237 { 238 NetClientState *nc; 239 int id = 0; 240 241 QTAILQ_FOREACH(nc, &net_clients, next) { 242 if (nc == nc1) { 243 continue; 244 } 245 if (strcmp(nc->model, model) == 0) { 246 id++; 247 } 248 } 249 250 return g_strdup_printf("%s.%d", model, id); 251 } 252 253 static void qemu_net_client_destructor(NetClientState *nc) 254 { 255 g_free(nc); 256 } 257 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 258 unsigned flags, 259 const struct iovec *iov, 260 int iovcnt, 261 void *opaque); 262 263 static void qemu_net_client_setup(NetClientState *nc, 264 NetClientInfo *info, 265 NetClientState *peer, 266 const char *model, 267 const char *name, 268 NetClientDestructor *destructor, 269 bool is_datapath) 270 { 271 nc->info = info; 272 nc->model = g_strdup(model); 273 if (name) { 274 nc->name = g_strdup(name); 275 } else { 276 nc->name = assign_name(nc, model); 277 } 278 279 if (peer) { 280 assert(!peer->peer); 281 nc->peer = peer; 282 peer->peer = nc; 283 } 284 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 285 286 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 287 nc->destructor = destructor; 288 nc->is_datapath = is_datapath; 289 QTAILQ_INIT(&nc->filters); 290 } 291 292 NetClientState *qemu_new_net_client(NetClientInfo *info, 293 NetClientState *peer, 294 const char *model, 295 const char *name) 296 { 297 NetClientState *nc; 298 299 assert(info->size >= sizeof(NetClientState)); 300 301 nc = g_malloc0(info->size); 302 qemu_net_client_setup(nc, info, peer, model, name, 303 qemu_net_client_destructor, true); 304 305 return nc; 306 } 307 308 NetClientState *qemu_new_net_control_client(NetClientInfo *info, 309 NetClientState *peer, 310 const char *model, 311 const char *name) 312 { 313 NetClientState *nc; 314 315 assert(info->size >= sizeof(NetClientState)); 316 317 nc = g_malloc0(info->size); 318 qemu_net_client_setup(nc, info, peer, model, name, 319 qemu_net_client_destructor, false); 320 321 return nc; 322 } 323 324 NICState *qemu_new_nic(NetClientInfo *info, 325 NICConf *conf, 326 const char *model, 327 const char *name, 328 MemReentrancyGuard *reentrancy_guard, 329 void *opaque) 330 { 331 NetClientState **peers = conf->peers.ncs; 332 NICState *nic; 333 int i, queues = MAX(1, conf->peers.queues); 334 335 assert(info->type == NET_CLIENT_DRIVER_NIC); 336 assert(info->size >= sizeof(NICState)); 337 338 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 339 nic->ncs = (void *)nic + info->size; 340 nic->conf = conf; 341 nic->reentrancy_guard = reentrancy_guard, 342 nic->opaque = opaque; 343 344 for (i = 0; i < queues; i++) { 345 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 346 NULL, true); 347 nic->ncs[i].queue_index = i; 348 } 349 350 return nic; 351 } 352 353 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 354 { 355 return nic->ncs + queue_index; 356 } 357 358 NetClientState *qemu_get_queue(NICState *nic) 359 { 360 return qemu_get_subqueue(nic, 0); 361 } 362 363 NICState *qemu_get_nic(NetClientState *nc) 364 { 365 NetClientState *nc0 = nc - nc->queue_index; 366 367 return (NICState *)((void *)nc0 - nc->info->size); 368 } 369 370 void *qemu_get_nic_opaque(NetClientState *nc) 371 { 372 NICState *nic = qemu_get_nic(nc); 373 374 return nic->opaque; 375 } 376 377 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 378 { 379 assert(nc != NULL); 380 NetClientState *ncs = nc + queue_index; 381 return ncs->peer; 382 } 383 384 static void qemu_cleanup_net_client(NetClientState *nc, 385 bool remove_from_net_clients) 386 { 387 if (remove_from_net_clients) { 388 QTAILQ_REMOVE(&net_clients, nc, next); 389 } 390 391 if (nc->info->cleanup) { 392 nc->info->cleanup(nc); 393 } 394 } 395 396 static void qemu_free_net_client(NetClientState *nc) 397 { 398 if (nc->incoming_queue) { 399 qemu_del_net_queue(nc->incoming_queue); 400 } 401 if (nc->peer) { 402 nc->peer->peer = NULL; 403 } 404 g_free(nc->name); 405 g_free(nc->model); 406 if (nc->destructor) { 407 nc->destructor(nc); 408 } 409 } 410 411 void qemu_del_net_client(NetClientState *nc) 412 { 413 NetClientState *ncs[MAX_QUEUE_NUM]; 414 int queues, i; 415 NetFilterState *nf, *next; 416 417 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 418 419 /* If the NetClientState belongs to a multiqueue backend, we will change all 420 * other NetClientStates also. 421 */ 422 queues = qemu_find_net_clients_except(nc->name, ncs, 423 NET_CLIENT_DRIVER_NIC, 424 MAX_QUEUE_NUM); 425 assert(queues != 0); 426 427 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 428 object_unparent(OBJECT(nf)); 429 } 430 431 /* 432 * If there is a peer NIC, transfer ownership to it. Delete the client 433 * from net_client list but do not cleanup nor free. This way NIC can 434 * still access to members of the backend. 435 * 436 * The cleanup and free will be done when the NIC is free. 437 */ 438 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 439 NICState *nic = qemu_get_nic(nc->peer); 440 if (nic->peer_deleted) { 441 return; 442 } 443 nic->peer_deleted = true; 444 445 for (i = 0; i < queues; i++) { 446 ncs[i]->peer->link_down = true; 447 QTAILQ_REMOVE(&net_clients, ncs[i], next); 448 } 449 450 if (nc->peer->info->link_status_changed) { 451 nc->peer->info->link_status_changed(nc->peer); 452 } 453 454 return; 455 } 456 457 for (i = 0; i < queues; i++) { 458 qemu_cleanup_net_client(ncs[i], true); 459 qemu_free_net_client(ncs[i]); 460 } 461 } 462 463 void qemu_del_nic(NICState *nic) 464 { 465 int i, queues = MAX(nic->conf->peers.queues, 1); 466 467 qemu_macaddr_set_free(&nic->conf->macaddr); 468 469 for (i = 0; i < queues; i++) { 470 NetClientState *nc = qemu_get_subqueue(nic, i); 471 /* 472 * If this is a peer NIC and peer has already been deleted, clean it up 473 * and free it now. 474 */ 475 if (nic->peer_deleted) { 476 qemu_cleanup_net_client(nc->peer, false); 477 qemu_free_net_client(nc->peer); 478 } else if (nc->peer) { 479 /* if there are RX packets pending, complete them */ 480 qemu_purge_queued_packets(nc->peer); 481 } 482 } 483 484 for (i = queues - 1; i >= 0; i--) { 485 NetClientState *nc = qemu_get_subqueue(nic, i); 486 487 qemu_cleanup_net_client(nc, true); 488 qemu_free_net_client(nc); 489 } 490 491 g_free(nic); 492 } 493 494 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 495 { 496 NetClientState *nc; 497 498 QTAILQ_FOREACH(nc, &net_clients, next) { 499 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 500 if (nc->queue_index == 0) { 501 func(qemu_get_nic(nc), opaque); 502 } 503 } 504 } 505 } 506 507 bool qemu_has_ufo(NetClientState *nc) 508 { 509 if (!nc || !nc->info->has_ufo) { 510 return false; 511 } 512 513 return nc->info->has_ufo(nc); 514 } 515 516 bool qemu_has_uso(NetClientState *nc) 517 { 518 if (!nc || !nc->info->has_uso) { 519 return false; 520 } 521 522 return nc->info->has_uso(nc); 523 } 524 525 bool qemu_has_vnet_hdr(NetClientState *nc) 526 { 527 if (!nc || !nc->info->has_vnet_hdr) { 528 return false; 529 } 530 531 return nc->info->has_vnet_hdr(nc); 532 } 533 534 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 535 { 536 if (!nc || !nc->info->has_vnet_hdr_len) { 537 return false; 538 } 539 540 return nc->info->has_vnet_hdr_len(nc, len); 541 } 542 543 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 544 int ecn, int ufo, int uso4, int uso6) 545 { 546 if (!nc || !nc->info->set_offload) { 547 return; 548 } 549 550 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo, uso4, uso6); 551 } 552 553 int qemu_get_vnet_hdr_len(NetClientState *nc) 554 { 555 if (!nc) { 556 return 0; 557 } 558 559 return nc->vnet_hdr_len; 560 } 561 562 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 563 { 564 if (!nc || !nc->info->set_vnet_hdr_len) { 565 return; 566 } 567 568 assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) || 569 len == sizeof(struct virtio_net_hdr) || 570 len == sizeof(struct virtio_net_hdr_v1_hash)); 571 572 nc->vnet_hdr_len = len; 573 nc->info->set_vnet_hdr_len(nc, len); 574 } 575 576 bool qemu_get_vnet_hash_supported_types(NetClientState *nc, uint32_t *types) 577 { 578 if (!nc || !nc->info->get_vnet_hash_supported_types) { 579 return false; 580 } 581 582 return nc->info->get_vnet_hash_supported_types(nc, types); 583 } 584 585 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 586 { 587 #if HOST_BIG_ENDIAN 588 if (!nc || !nc->info->set_vnet_le) { 589 return -ENOSYS; 590 } 591 592 return nc->info->set_vnet_le(nc, is_le); 593 #else 594 return 0; 595 #endif 596 } 597 598 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 599 { 600 #if HOST_BIG_ENDIAN 601 return 0; 602 #else 603 if (!nc || !nc->info->set_vnet_be) { 604 return -ENOSYS; 605 } 606 607 return nc->info->set_vnet_be(nc, is_be); 608 #endif 609 } 610 611 int qemu_can_receive_packet(NetClientState *nc) 612 { 613 if (nc->receive_disabled) { 614 return 0; 615 } else if (nc->info->can_receive && 616 !nc->info->can_receive(nc)) { 617 return 0; 618 } 619 return 1; 620 } 621 622 int qemu_can_send_packet(NetClientState *sender) 623 { 624 int vm_running = runstate_is_running(); 625 626 if (!vm_running) { 627 return 0; 628 } 629 630 if (!sender->peer) { 631 return 1; 632 } 633 634 return qemu_can_receive_packet(sender->peer); 635 } 636 637 static ssize_t filter_receive_iov(NetClientState *nc, 638 NetFilterDirection direction, 639 NetClientState *sender, 640 unsigned flags, 641 const struct iovec *iov, 642 int iovcnt, 643 NetPacketSent *sent_cb) 644 { 645 ssize_t ret = 0; 646 NetFilterState *nf = NULL; 647 648 if (direction == NET_FILTER_DIRECTION_TX) { 649 QTAILQ_FOREACH(nf, &nc->filters, next) { 650 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 651 iovcnt, sent_cb); 652 if (ret) { 653 return ret; 654 } 655 } 656 } else { 657 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 658 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 659 iovcnt, sent_cb); 660 if (ret) { 661 return ret; 662 } 663 } 664 } 665 666 return ret; 667 } 668 669 static ssize_t filter_receive(NetClientState *nc, 670 NetFilterDirection direction, 671 NetClientState *sender, 672 unsigned flags, 673 const uint8_t *data, 674 size_t size, 675 NetPacketSent *sent_cb) 676 { 677 struct iovec iov = { 678 .iov_base = (void *)data, 679 .iov_len = size 680 }; 681 682 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 683 } 684 685 void qemu_purge_queued_packets(NetClientState *nc) 686 { 687 if (!nc->peer) { 688 return; 689 } 690 691 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 692 } 693 694 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 695 { 696 nc->receive_disabled = 0; 697 698 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 699 if (net_hub_flush(nc->peer)) { 700 qemu_notify_event(); 701 } 702 } 703 if (qemu_net_queue_flush(nc->incoming_queue)) { 704 /* We emptied the queue successfully, signal to the IO thread to repoll 705 * the file descriptor (for tap, for example). 706 */ 707 qemu_notify_event(); 708 } else if (purge) { 709 /* Unable to empty the queue, purge remaining packets */ 710 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 711 } 712 } 713 714 void qemu_flush_queued_packets(NetClientState *nc) 715 { 716 qemu_flush_or_purge_queued_packets(nc, false); 717 } 718 719 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 720 unsigned flags, 721 const uint8_t *buf, int size, 722 NetPacketSent *sent_cb) 723 { 724 NetQueue *queue; 725 int ret; 726 727 #ifdef DEBUG_NET 728 printf("qemu_send_packet_async:\n"); 729 qemu_hexdump(stdout, "net", buf, size); 730 #endif 731 732 if (sender->link_down || !sender->peer) { 733 return size; 734 } 735 736 /* Let filters handle the packet first */ 737 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 738 sender, flags, buf, size, sent_cb); 739 if (ret) { 740 return ret; 741 } 742 743 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 744 sender, flags, buf, size, sent_cb); 745 if (ret) { 746 return ret; 747 } 748 749 queue = sender->peer->incoming_queue; 750 751 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 752 } 753 754 ssize_t qemu_send_packet_async(NetClientState *sender, 755 const uint8_t *buf, int size, 756 NetPacketSent *sent_cb) 757 { 758 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 759 buf, size, sent_cb); 760 } 761 762 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 763 { 764 return qemu_send_packet_async(nc, buf, size, NULL); 765 } 766 767 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 768 { 769 uint8_t min_pkt[ETH_ZLEN]; 770 size_t min_pktsz = sizeof(min_pkt); 771 772 if (!qemu_can_receive_packet(nc)) { 773 return 0; 774 } 775 776 if (net_peer_needs_padding(nc)) { 777 if (eth_pad_short_frame(min_pkt, &min_pktsz, buf, size)) { 778 buf = min_pkt; 779 size = min_pktsz; 780 } 781 } 782 783 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 784 } 785 786 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 787 { 788 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 789 buf, size, NULL); 790 } 791 792 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 793 int iovcnt, unsigned flags) 794 { 795 uint8_t *buf = NULL; 796 uint8_t *buffer; 797 size_t offset; 798 ssize_t ret; 799 800 if (iovcnt == 1) { 801 buffer = iov[0].iov_base; 802 offset = iov[0].iov_len; 803 } else { 804 offset = iov_size(iov, iovcnt); 805 if (offset > NET_BUFSIZE) { 806 return -1; 807 } 808 buf = g_malloc(offset); 809 buffer = buf; 810 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 811 } 812 813 ret = nc->info->receive(nc, buffer, offset); 814 815 g_free(buf); 816 return ret; 817 } 818 819 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 820 unsigned flags, 821 const struct iovec *iov, 822 int iovcnt, 823 void *opaque) 824 { 825 MemReentrancyGuard *owned_reentrancy_guard; 826 NetClientState *nc = opaque; 827 int ret; 828 struct virtio_net_hdr_v1_hash vnet_hdr = { }; 829 g_autofree struct iovec *iov_copy = NULL; 830 831 832 if (nc->link_down) { 833 return iov_size(iov, iovcnt); 834 } 835 836 if (nc->receive_disabled) { 837 return 0; 838 } 839 840 if (nc->info->type != NET_CLIENT_DRIVER_NIC || 841 qemu_get_nic(nc)->reentrancy_guard->engaged_in_io) { 842 owned_reentrancy_guard = NULL; 843 } else { 844 owned_reentrancy_guard = qemu_get_nic(nc)->reentrancy_guard; 845 owned_reentrancy_guard->engaged_in_io = true; 846 } 847 848 if ((flags & QEMU_NET_PACKET_FLAG_RAW) && nc->vnet_hdr_len) { 849 iov_copy = g_new(struct iovec, iovcnt + 1); 850 iov_copy[0].iov_base = &vnet_hdr; 851 iov_copy[0].iov_len = nc->vnet_hdr_len; 852 memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); 853 iov = iov_copy; 854 iovcnt++; 855 } 856 857 if (nc->info->receive_iov) { 858 ret = nc->info->receive_iov(nc, iov, iovcnt); 859 } else { 860 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 861 } 862 863 if (owned_reentrancy_guard) { 864 owned_reentrancy_guard->engaged_in_io = false; 865 } 866 867 if (ret == 0) { 868 nc->receive_disabled = 1; 869 } 870 871 return ret; 872 } 873 874 ssize_t qemu_sendv_packet_async(NetClientState *sender, 875 const struct iovec *iov, int iovcnt, 876 NetPacketSent *sent_cb) 877 { 878 NetQueue *queue; 879 size_t size = iov_size(iov, iovcnt); 880 int ret; 881 882 if (size > NET_BUFSIZE) { 883 return size; 884 } 885 886 if (sender->link_down || !sender->peer) { 887 return size; 888 } 889 890 /* Let filters handle the packet first */ 891 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 892 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 893 if (ret) { 894 return ret; 895 } 896 897 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 898 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 899 if (ret) { 900 return ret; 901 } 902 903 queue = sender->peer->incoming_queue; 904 905 return qemu_net_queue_send_iov(queue, sender, 906 QEMU_NET_PACKET_FLAG_NONE, 907 iov, iovcnt, sent_cb); 908 } 909 910 ssize_t 911 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 912 { 913 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 914 } 915 916 NetClientState *qemu_find_netdev(const char *id) 917 { 918 NetClientState *nc; 919 920 QTAILQ_FOREACH(nc, &net_clients, next) { 921 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 922 continue; 923 if (!strcmp(nc->name, id)) { 924 return nc; 925 } 926 } 927 928 return NULL; 929 } 930 931 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 932 NetClientDriver type, int max) 933 { 934 NetClientState *nc; 935 int ret = 0; 936 937 QTAILQ_FOREACH(nc, &net_clients, next) { 938 if (nc->info->type == type) { 939 continue; 940 } 941 if (!id || !strcmp(nc->name, id)) { 942 if (ret < max) { 943 ncs[ret] = nc; 944 } 945 ret++; 946 } 947 } 948 949 return ret; 950 } 951 952 static int nic_get_free_idx(void) 953 { 954 int index; 955 956 for (index = 0; index < MAX_NICS; index++) 957 if (!nd_table[index].used) 958 return index; 959 return -1; 960 } 961 962 GPtrArray *qemu_get_nic_models(const char *device_type) 963 { 964 GPtrArray *nic_models = g_ptr_array_new(); 965 GSList *list = object_class_get_list_sorted(device_type, false); 966 967 while (list) { 968 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data, 969 TYPE_DEVICE); 970 GSList *next; 971 if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) && 972 dc->user_creatable) { 973 const char *name = object_class_get_name(list->data); 974 /* 975 * A network device might also be something else than a NIC, see 976 * e.g. the "rocker" device. Thus we have to look for the "netdev" 977 * property, too. Unfortunately, some devices like virtio-net only 978 * create this property during instance_init, so we have to create 979 * a temporary instance here to be able to check it. 980 */ 981 Object *obj = object_new_with_class(OBJECT_CLASS(dc)); 982 if (object_property_find(obj, "netdev")) { 983 g_ptr_array_add(nic_models, (gpointer)name); 984 } 985 object_unref(obj); 986 } 987 next = list->next; 988 g_slist_free_1(list); 989 list = next; 990 } 991 g_ptr_array_add(nic_models, NULL); 992 993 return nic_models; 994 } 995 996 static int net_init_nic(const Netdev *netdev, const char *name, 997 NetClientState *peer, Error **errp) 998 { 999 int idx; 1000 NICInfo *nd; 1001 const NetLegacyNicOptions *nic; 1002 1003 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 1004 nic = &netdev->u.nic; 1005 1006 idx = nic_get_free_idx(); 1007 if (idx == -1 || nb_nics >= MAX_NICS) { 1008 error_setg(errp, "too many NICs"); 1009 return -1; 1010 } 1011 1012 nd = &nd_table[idx]; 1013 1014 memset(nd, 0, sizeof(*nd)); 1015 1016 if (nic->netdev) { 1017 nd->netdev = qemu_find_netdev(nic->netdev); 1018 if (!nd->netdev) { 1019 error_setg(errp, "netdev '%s' not found", nic->netdev); 1020 return -1; 1021 } 1022 } else { 1023 assert(peer); 1024 nd->netdev = peer; 1025 } 1026 nd->name = g_strdup(name); 1027 if (nic->model) { 1028 nd->model = g_strdup(nic->model); 1029 } 1030 if (nic->addr) { 1031 nd->devaddr = g_strdup(nic->addr); 1032 } 1033 1034 if (nic->macaddr && 1035 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 1036 error_setg(errp, "invalid syntax for ethernet address"); 1037 return -1; 1038 } 1039 if (nic->macaddr && 1040 is_multicast_ether_addr(nd->macaddr.a)) { 1041 error_setg(errp, 1042 "NIC cannot have multicast MAC address (odd 1st byte)"); 1043 return -1; 1044 } 1045 qemu_macaddr_default_if_unset(&nd->macaddr); 1046 1047 if (nic->has_vectors) { 1048 if (nic->vectors > 0x7ffffff) { 1049 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 1050 return -1; 1051 } 1052 nd->nvectors = nic->vectors; 1053 } else { 1054 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 1055 } 1056 1057 nd->used = 1; 1058 nb_nics++; 1059 1060 return idx; 1061 } 1062 1063 static gboolean add_nic_result(gpointer key, gpointer value, gpointer user_data) 1064 { 1065 GPtrArray *results = user_data; 1066 GPtrArray *alias_list = value; 1067 const char *model = key; 1068 char *result; 1069 1070 if (!alias_list) { 1071 result = g_strdup(model); 1072 } else { 1073 GString *result_str = g_string_new(model); 1074 int i; 1075 1076 g_string_append(result_str, " (aka "); 1077 for (i = 0; i < alias_list->len; i++) { 1078 if (i) { 1079 g_string_append(result_str, ", "); 1080 } 1081 g_string_append(result_str, alias_list->pdata[i]); 1082 } 1083 g_string_append(result_str, ")"); 1084 result = result_str->str; 1085 g_string_free(result_str, false); 1086 g_ptr_array_unref(alias_list); 1087 } 1088 g_ptr_array_add(results, result); 1089 return true; 1090 } 1091 1092 static int model_cmp(char **a, char **b) 1093 { 1094 return strcmp(*a, *b); 1095 } 1096 1097 static void show_nic_models(void) 1098 { 1099 GPtrArray *results = g_ptr_array_new(); 1100 int i; 1101 1102 g_hash_table_foreach_remove(nic_model_help, add_nic_result, results); 1103 g_ptr_array_sort(results, (GCompareFunc)model_cmp); 1104 1105 printf("Available NIC models for this configuration:\n"); 1106 for (i = 0 ; i < results->len; i++) { 1107 printf("%s\n", (char *)results->pdata[i]); 1108 } 1109 g_hash_table_unref(nic_model_help); 1110 nic_model_help = NULL; 1111 } 1112 1113 static void add_nic_model_help(const char *model, const char *alias) 1114 { 1115 GPtrArray *alias_list = NULL; 1116 1117 if (g_hash_table_lookup_extended(nic_model_help, model, NULL, 1118 (gpointer *)&alias_list)) { 1119 /* Already exists, no alias to add: return */ 1120 if (!alias) { 1121 return; 1122 } 1123 if (alias_list) { 1124 /* Check if this alias is already in the list. Add if not. */ 1125 if (!g_ptr_array_find_with_equal_func(alias_list, alias, 1126 g_str_equal, NULL)) { 1127 g_ptr_array_add(alias_list, g_strdup(alias)); 1128 } 1129 return; 1130 } 1131 } 1132 /* Either this model wasn't in the list already, or a first alias added */ 1133 if (alias) { 1134 alias_list = g_ptr_array_new(); 1135 g_ptr_array_set_free_func(alias_list, g_free); 1136 g_ptr_array_add(alias_list, g_strdup(alias)); 1137 } 1138 g_hash_table_replace(nic_model_help, g_strdup(model), alias_list); 1139 } 1140 1141 NICInfo *qemu_find_nic_info(const char *typename, bool match_default, 1142 const char *alias) 1143 { 1144 NICInfo *nd; 1145 int i; 1146 1147 if (nic_model_help) { 1148 add_nic_model_help(typename, alias); 1149 } 1150 1151 for (i = 0; i < nb_nics; i++) { 1152 nd = &nd_table[i]; 1153 1154 if (!nd->used || nd->instantiated) { 1155 continue; 1156 } 1157 1158 if ((match_default && !nd->model) || !g_strcmp0(nd->model, typename) 1159 || (alias && !g_strcmp0(nd->model, alias))) { 1160 return nd; 1161 } 1162 } 1163 return NULL; 1164 } 1165 1166 static bool is_nic_model_help_option(const char *model) 1167 { 1168 if (model && is_help_option(model)) { 1169 /* 1170 * Trigger the help output by instantiating the hash table which 1171 * will gather tha available models as they get registered. 1172 */ 1173 if (!nic_model_help) { 1174 nic_model_help = g_hash_table_new_full(g_str_hash, g_str_equal, 1175 g_free, NULL); 1176 } 1177 return true; 1178 } 1179 return false; 1180 } 1181 1182 /* "I have created a device. Please configure it if you can" */ 1183 bool qemu_configure_nic_device(DeviceState *dev, bool match_default, 1184 const char *alias) 1185 { 1186 NICInfo *nd = qemu_find_nic_info(object_get_typename(OBJECT(dev)), 1187 match_default, alias); 1188 1189 if (nd) { 1190 qdev_set_nic_properties(dev, nd); 1191 return true; 1192 } 1193 return false; 1194 } 1195 1196 /* "Please create a device, if you have a configuration for it" */ 1197 DeviceState *qemu_create_nic_device(const char *typename, bool match_default, 1198 const char *alias) 1199 { 1200 NICInfo *nd = qemu_find_nic_info(typename, match_default, alias); 1201 DeviceState *dev; 1202 1203 if (!nd) { 1204 return NULL; 1205 } 1206 1207 dev = qdev_new(typename); 1208 qdev_set_nic_properties(dev, nd); 1209 return dev; 1210 } 1211 1212 void qemu_create_nic_bus_devices(BusState *bus, const char *parent_type, 1213 const char *default_model, 1214 const char *alias, const char *alias_target) 1215 { 1216 GPtrArray *nic_models = qemu_get_nic_models(parent_type); 1217 const char *model; 1218 DeviceState *dev; 1219 NICInfo *nd; 1220 int i; 1221 1222 if (nic_model_help) { 1223 if (alias_target) { 1224 add_nic_model_help(alias_target, alias); 1225 } 1226 for (i = 0; i < nic_models->len - 1; i++) { 1227 add_nic_model_help(nic_models->pdata[i], NULL); 1228 } 1229 } 1230 1231 /* Drop the NULL terminator which would make g_str_equal() unhappy */ 1232 nic_models->len--; 1233 1234 for (i = 0; i < nb_nics; i++) { 1235 nd = &nd_table[i]; 1236 1237 if (!nd->used || nd->instantiated) { 1238 continue; 1239 } 1240 1241 model = nd->model ? nd->model : default_model; 1242 if (!model) { 1243 continue; 1244 } 1245 1246 /* Each bus type is allowed *one* substitution */ 1247 if (g_str_equal(model, alias)) { 1248 model = alias_target; 1249 } 1250 1251 if (!g_ptr_array_find_with_equal_func(nic_models, model, 1252 g_str_equal, NULL)) { 1253 /* This NIC does not live on this bus. */ 1254 continue; 1255 } 1256 1257 dev = qdev_new(model); 1258 qdev_set_nic_properties(dev, nd); 1259 qdev_realize_and_unref(dev, bus, &error_fatal); 1260 } 1261 1262 g_ptr_array_free(nic_models, true); 1263 } 1264 1265 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 1266 const Netdev *netdev, 1267 const char *name, 1268 NetClientState *peer, Error **errp) = { 1269 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 1270 #ifdef CONFIG_PASST 1271 [NET_CLIENT_DRIVER_PASST] = net_init_passt, 1272 #endif 1273 #ifdef CONFIG_SLIRP 1274 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1275 #endif 1276 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1277 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1278 [NET_CLIENT_DRIVER_STREAM] = net_init_stream, 1279 [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, 1280 #ifdef CONFIG_VDE 1281 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1282 #endif 1283 #ifdef CONFIG_NETMAP 1284 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1285 #endif 1286 #ifdef CONFIG_AF_XDP 1287 [NET_CLIENT_DRIVER_AF_XDP] = net_init_af_xdp, 1288 #endif 1289 #ifdef CONFIG_NET_BRIDGE 1290 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1291 #endif 1292 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1293 #ifdef CONFIG_VHOST_NET_USER 1294 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1295 #endif 1296 #ifdef CONFIG_VHOST_NET_VDPA 1297 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1298 #endif 1299 #ifdef CONFIG_L2TPV3 1300 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1301 #endif 1302 #ifdef CONFIG_VMNET 1303 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1304 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1305 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1306 #endif /* CONFIG_VMNET */ 1307 }; 1308 1309 1310 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1311 { 1312 NetClientState *peer = NULL; 1313 NetClientState *nc; 1314 1315 if (is_netdev) { 1316 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1317 !net_client_init_fun[netdev->type]) { 1318 error_setg(errp, "network backend '%s' is not compiled into this binary", 1319 NetClientDriver_str(netdev->type)); 1320 return -1; 1321 } 1322 } else { 1323 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1324 return 0; /* nothing to do */ 1325 } 1326 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { 1327 error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", 1328 NetClientDriver_str(netdev->type)); 1329 return -1; 1330 } 1331 1332 if (!net_client_init_fun[netdev->type]) { 1333 error_setg(errp, "network backend '%s' is not compiled into this binary", 1334 NetClientDriver_str(netdev->type)); 1335 return -1; 1336 } 1337 1338 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1339 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1340 !netdev->u.nic.netdev) { 1341 peer = net_hub_add_port(0, NULL, NULL); 1342 } 1343 } 1344 1345 nc = qemu_find_netdev(netdev->id); 1346 if (nc) { 1347 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1348 return -1; 1349 } 1350 1351 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1352 /* FIXME drop when all init functions store an Error */ 1353 if (errp && !*errp) { 1354 error_setg(errp, "Device '%s' could not be initialized", 1355 NetClientDriver_str(netdev->type)); 1356 } 1357 return -1; 1358 } 1359 1360 if (is_netdev) { 1361 nc = qemu_find_netdev(netdev->id); 1362 assert(nc); 1363 nc->is_netdev = true; 1364 } 1365 1366 return 0; 1367 } 1368 1369 void show_netdevs(void) 1370 { 1371 int idx; 1372 const char *available_netdevs[] = { 1373 "socket", 1374 "stream", 1375 "dgram", 1376 "hubport", 1377 "tap", 1378 "passt", 1379 #ifdef CONFIG_SLIRP 1380 "user", 1381 #endif 1382 #ifdef CONFIG_L2TPV3 1383 "l2tpv3", 1384 #endif 1385 #ifdef CONFIG_VDE 1386 "vde", 1387 #endif 1388 #ifdef CONFIG_NET_BRIDGE 1389 "bridge", 1390 #endif 1391 #ifdef CONFIG_NETMAP 1392 "netmap", 1393 #endif 1394 #ifdef CONFIG_AF_XDP 1395 "af-xdp", 1396 #endif 1397 #ifdef CONFIG_POSIX 1398 "vhost-user", 1399 #endif 1400 #ifdef CONFIG_VHOST_VDPA 1401 "vhost-vdpa", 1402 #endif 1403 #ifdef CONFIG_VMNET 1404 "vmnet-host", 1405 "vmnet-shared", 1406 "vmnet-bridged", 1407 #endif 1408 }; 1409 1410 qemu_printf("Available netdev backend types:\n"); 1411 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1412 qemu_printf("%s\n", available_netdevs[idx]); 1413 } 1414 } 1415 1416 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1417 { 1418 gchar **substrings = NULL; 1419 Netdev *object = NULL; 1420 int ret = -1; 1421 Visitor *v = opts_visitor_new(opts); 1422 1423 /* Parse convenience option format ipv6-net=fec0::0[/64] */ 1424 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1425 1426 if (ip6_net) { 1427 char *prefix_addr; 1428 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1429 1430 substrings = g_strsplit(ip6_net, "/", 2); 1431 if (!substrings || !substrings[0]) { 1432 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1433 "a valid IPv6 prefix"); 1434 goto out; 1435 } 1436 1437 prefix_addr = substrings[0]; 1438 1439 /* Handle user-specified prefix length. */ 1440 if (substrings[1] && 1441 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1442 { 1443 error_setg(errp, 1444 "parameter 'ipv6-net' expects a number after '/'"); 1445 goto out; 1446 } 1447 1448 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1449 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1450 &error_abort); 1451 qemu_opt_unset(opts, "ipv6-net"); 1452 } 1453 1454 /* Create an ID for -net if the user did not specify one */ 1455 if (!is_netdev && !qemu_opts_id(opts)) { 1456 qemu_opts_set_id(opts, id_generate(ID_NET)); 1457 } 1458 1459 if (visit_type_Netdev(v, NULL, &object, errp)) { 1460 ret = net_client_init1(object, is_netdev, errp); 1461 } 1462 1463 qapi_free_Netdev(object); 1464 1465 out: 1466 g_strfreev(substrings); 1467 visit_free(v); 1468 return ret; 1469 } 1470 1471 void netdev_add(QemuOpts *opts, Error **errp) 1472 { 1473 net_client_init(opts, true, errp); 1474 } 1475 1476 void qmp_netdev_add(Netdev *netdev, Error **errp) 1477 { 1478 if (!id_wellformed(netdev->id)) { 1479 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1480 return; 1481 } 1482 1483 net_client_init1(netdev, true, errp); 1484 } 1485 1486 void qmp_netdev_del(const char *id, Error **errp) 1487 { 1488 NetClientState *nc; 1489 QemuOpts *opts; 1490 1491 nc = qemu_find_netdev(id); 1492 if (!nc) { 1493 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1494 "Device '%s' not found", id); 1495 return; 1496 } 1497 1498 if (!nc->is_netdev) { 1499 error_setg(errp, "Device '%s' is not a netdev", id); 1500 return; 1501 } 1502 1503 qemu_del_net_client(nc); 1504 1505 /* 1506 * Wart: we need to delete the QemuOpts associated with netdevs 1507 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1508 * HMP netdev_add. 1509 */ 1510 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1511 if (opts) { 1512 qemu_opts_del(opts); 1513 } 1514 } 1515 1516 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1517 { 1518 char *str; 1519 ObjectProperty *prop; 1520 ObjectPropertyIterator iter; 1521 Visitor *v; 1522 1523 /* generate info str */ 1524 object_property_iter_init(&iter, OBJECT(nf)); 1525 while ((prop = object_property_iter_next(&iter))) { 1526 if (!strcmp(prop->name, "type")) { 1527 continue; 1528 } 1529 v = string_output_visitor_new(false, &str); 1530 object_property_get(OBJECT(nf), prop->name, v, NULL); 1531 visit_complete(v, &str); 1532 visit_free(v); 1533 monitor_printf(mon, ",%s=%s", prop->name, str); 1534 g_free(str); 1535 } 1536 monitor_printf(mon, "\n"); 1537 } 1538 1539 void print_net_client(Monitor *mon, NetClientState *nc) 1540 { 1541 NetFilterState *nf; 1542 1543 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1544 nc->queue_index, 1545 NetClientDriver_str(nc->info->type), 1546 nc->info_str); 1547 if (!QTAILQ_EMPTY(&nc->filters)) { 1548 monitor_printf(mon, "filters:\n"); 1549 } 1550 QTAILQ_FOREACH(nf, &nc->filters, next) { 1551 monitor_printf(mon, " - %s: type=%s", 1552 object_get_canonical_path_component(OBJECT(nf)), 1553 object_get_typename(OBJECT(nf))); 1554 netfilter_print_info(mon, nf); 1555 } 1556 } 1557 1558 RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp) 1559 { 1560 NetClientState *nc; 1561 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1562 1563 QTAILQ_FOREACH(nc, &net_clients, next) { 1564 RxFilterInfo *info; 1565 1566 if (name && strcmp(nc->name, name) != 0) { 1567 continue; 1568 } 1569 1570 /* only query rx-filter information of NIC */ 1571 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1572 if (name) { 1573 error_setg(errp, "net client(%s) isn't a NIC", name); 1574 assert(!filter_list); 1575 return NULL; 1576 } 1577 continue; 1578 } 1579 1580 /* only query information on queue 0 since the info is per nic, 1581 * not per queue 1582 */ 1583 if (nc->queue_index != 0) 1584 continue; 1585 1586 if (nc->info->query_rx_filter) { 1587 info = nc->info->query_rx_filter(nc); 1588 QAPI_LIST_APPEND(tail, info); 1589 } else if (name) { 1590 error_setg(errp, "net client(%s) doesn't support" 1591 " rx-filter querying", name); 1592 assert(!filter_list); 1593 return NULL; 1594 } 1595 1596 if (name) { 1597 break; 1598 } 1599 } 1600 1601 if (filter_list == NULL && name) { 1602 error_setg(errp, "invalid net client name: %s", name); 1603 } 1604 1605 return filter_list; 1606 } 1607 1608 void colo_notify_filters_event(int event, Error **errp) 1609 { 1610 NetClientState *nc; 1611 NetFilterState *nf; 1612 NetFilterClass *nfc = NULL; 1613 Error *local_err = NULL; 1614 1615 QTAILQ_FOREACH(nc, &net_clients, next) { 1616 QTAILQ_FOREACH(nf, &nc->filters, next) { 1617 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1618 nfc->handle_event(nf, event, &local_err); 1619 if (local_err) { 1620 error_propagate(errp, local_err); 1621 return; 1622 } 1623 } 1624 } 1625 } 1626 1627 void net_client_set_link(NetClientState **ncs, int queues, bool up) 1628 { 1629 NetClientState *nc; 1630 int i; 1631 1632 nc = ncs[0]; 1633 1634 for (i = 0; i < queues; i++) { 1635 ncs[i]->link_down = !up; 1636 } 1637 1638 if (nc->info->link_status_changed) { 1639 nc->info->link_status_changed(nc); 1640 } 1641 1642 if (nc->peer) { 1643 /* Change peer link only if the peer is NIC and then notify peer. 1644 * If the peer is a HUBPORT or a backend, we do not change the 1645 * link status. 1646 * 1647 * This behavior is compatible with qemu hubs where there could be 1648 * multiple clients that can still communicate with each other in 1649 * disconnected mode. For now maintain this compatibility. 1650 */ 1651 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1652 for (i = 0; i < queues; i++) { 1653 ncs[i]->peer->link_down = !up; 1654 } 1655 } 1656 if (nc->peer->info->link_status_changed) { 1657 nc->peer->info->link_status_changed(nc->peer); 1658 } 1659 } 1660 } 1661 1662 void qmp_set_link(const char *name, bool up, Error **errp) 1663 { 1664 NetClientState *ncs[MAX_QUEUE_NUM]; 1665 int queues; 1666 1667 queues = qemu_find_net_clients_except(name, ncs, 1668 NET_CLIENT_DRIVER__MAX, 1669 MAX_QUEUE_NUM); 1670 1671 if (queues == 0) { 1672 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1673 "Device '%s' not found", name); 1674 return; 1675 } 1676 1677 net_client_set_link(ncs, queues, up); 1678 } 1679 1680 static void net_vm_change_state_handler(void *opaque, bool running, 1681 RunState state) 1682 { 1683 NetClientState *nc; 1684 NetClientState *tmp; 1685 1686 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1687 if (running) { 1688 /* Flush queued packets and wake up backends. */ 1689 if (nc->peer && qemu_can_send_packet(nc)) { 1690 qemu_flush_queued_packets(nc->peer); 1691 } 1692 } else { 1693 /* Complete all queued packets, to guarantee we don't modify 1694 * state later when VM is not running. 1695 */ 1696 qemu_flush_or_purge_queued_packets(nc, true); 1697 } 1698 } 1699 } 1700 1701 void net_cleanup(void) 1702 { 1703 NetClientState *nc, **p = &QTAILQ_FIRST(&net_clients); 1704 1705 /*cleanup colo compare module for COLO*/ 1706 colo_compare_cleanup(); 1707 1708 /* 1709 * Walk the net_clients list and remove the netdevs but *not* any 1710 * NET_CLIENT_DRIVER_NIC entries. The latter are owned by the device 1711 * model which created them, and in some cases (e.g. xen-net-device) 1712 * the device itself may do cleanup at exit and will be upset if we 1713 * just delete its NIC from underneath it. 1714 * 1715 * Since qemu_del_net_client() may delete multiple entries, using 1716 * QTAILQ_FOREACH_SAFE() is not safe here. The only safe pointer 1717 * to keep as a bookmark is a NET_CLIENT_DRIVER_NIC entry, so keep 1718 * 'p' pointing to either the head of the list, or the 'next' field 1719 * of the latest NET_CLIENT_DRIVER_NIC, and operate on *p as we walk 1720 * the list. 1721 * 1722 * However, the NIC may have peers that trust to be clean beyond this 1723 * point. For example, if they have been removed with device_del. 1724 * 1725 * The 'nc' variable isn't part of the list traversal; it's purely 1726 * for convenience as too much '(*p)->' has a tendency to make the 1727 * readers' eyes bleed. 1728 */ 1729 while (*p) { 1730 nc = *p; 1731 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1732 NICState *nic = qemu_get_nic(nc); 1733 1734 if (nic->peer_deleted) { 1735 int queues = MAX(nic->conf->peers.queues, 1); 1736 1737 for (int i = 0; i < queues; i++) { 1738 nc = qemu_get_subqueue(nic, i); 1739 qemu_cleanup_net_client(nc->peer, false); 1740 } 1741 } 1742 1743 /* Skip NET_CLIENT_DRIVER_NIC entries */ 1744 p = &QTAILQ_NEXT(nc, next); 1745 } else { 1746 qemu_del_net_client(nc); 1747 } 1748 } 1749 1750 qemu_del_vm_change_state_handler(net_change_state_entry); 1751 } 1752 1753 void net_check_clients(void) 1754 { 1755 NetClientState *nc; 1756 int i; 1757 1758 if (nic_model_help) { 1759 show_nic_models(); 1760 exit(0); 1761 } 1762 net_hub_check_clients(); 1763 1764 QTAILQ_FOREACH(nc, &net_clients, next) { 1765 if (!nc->peer) { 1766 warn_report("%s %s has no peer", 1767 nc->info->type == NET_CLIENT_DRIVER_NIC 1768 ? "nic" : "netdev", 1769 nc->name); 1770 } 1771 } 1772 1773 /* Check that all NICs requested via -net nic actually got created. 1774 * NICs created via -device don't need to be checked here because 1775 * they are always instantiated. 1776 */ 1777 for (i = 0; i < MAX_NICS; i++) { 1778 NICInfo *nd = &nd_table[i]; 1779 if (nd->used && !nd->instantiated) { 1780 warn_report("requested NIC (%s, model %s) " 1781 "was not created (not supported by this machine?)", 1782 nd->name ? nd->name : "anonymous", 1783 nd->model ? nd->model : "unspecified"); 1784 } 1785 } 1786 } 1787 1788 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1789 { 1790 const char *model = qemu_opt_get(opts, "model"); 1791 1792 if (is_nic_model_help_option(model)) { 1793 return 0; 1794 } 1795 1796 return net_client_init(opts, false, errp); 1797 } 1798 1799 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1800 { 1801 const char *type = qemu_opt_get(opts, "type"); 1802 1803 if (type && is_help_option(type)) { 1804 show_netdevs(); 1805 exit(0); 1806 } 1807 return net_client_init(opts, true, errp); 1808 } 1809 1810 /* For the convenience "--nic" parameter */ 1811 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1812 { 1813 char *mac, *nd_id; 1814 int idx, ret; 1815 NICInfo *ni; 1816 const char *type; 1817 1818 type = qemu_opt_get(opts, "type"); 1819 if (type) { 1820 if (g_str_equal(type, "none")) { 1821 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1822 } 1823 if (is_help_option(type)) { 1824 GPtrArray *nic_models = qemu_get_nic_models(TYPE_DEVICE); 1825 int i; 1826 show_netdevs(); 1827 printf("\n"); 1828 printf("Available NIC models " 1829 "(use -nic model=help for a filtered list):\n"); 1830 for (i = 0 ; nic_models->pdata[i]; i++) { 1831 printf("%s\n", (char *)nic_models->pdata[i]); 1832 } 1833 g_ptr_array_free(nic_models, true); 1834 exit(0); 1835 } 1836 } 1837 1838 idx = nic_get_free_idx(); 1839 if (idx == -1 || nb_nics >= MAX_NICS) { 1840 error_setg(errp, "no more on-board/default NIC slots available"); 1841 return -1; 1842 } 1843 1844 if (!type) { 1845 qemu_opt_set(opts, "type", "user", &error_abort); 1846 } 1847 1848 ni = &nd_table[idx]; 1849 memset(ni, 0, sizeof(*ni)); 1850 ni->model = qemu_opt_get_del(opts, "model"); 1851 1852 if (is_nic_model_help_option(ni->model)) { 1853 return 0; 1854 } 1855 1856 /* Create an ID if the user did not specify one */ 1857 nd_id = g_strdup(qemu_opts_id(opts)); 1858 if (!nd_id) { 1859 nd_id = id_generate(ID_NET); 1860 qemu_opts_set_id(opts, nd_id); 1861 } 1862 1863 /* Handle MAC address */ 1864 mac = qemu_opt_get_del(opts, "mac"); 1865 if (mac) { 1866 ret = net_parse_macaddr(ni->macaddr.a, mac); 1867 g_free(mac); 1868 if (ret) { 1869 error_setg(errp, "invalid syntax for ethernet address"); 1870 goto out; 1871 } 1872 if (is_multicast_ether_addr(ni->macaddr.a)) { 1873 error_setg(errp, "NIC cannot have multicast MAC address"); 1874 ret = -1; 1875 goto out; 1876 } 1877 } 1878 qemu_macaddr_default_if_unset(&ni->macaddr); 1879 1880 ret = net_client_init(opts, true, errp); 1881 if (ret == 0) { 1882 ni->netdev = qemu_find_netdev(nd_id); 1883 ni->used = true; 1884 nb_nics++; 1885 } 1886 1887 out: 1888 g_free(nd_id); 1889 return ret; 1890 } 1891 1892 static void netdev_init_modern(void) 1893 { 1894 while (!QSIMPLEQ_EMPTY(&nd_queue)) { 1895 NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); 1896 1897 QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); 1898 loc_push_restore(&nd->loc); 1899 net_client_init1(nd->nd, true, &error_fatal); 1900 loc_pop(&nd->loc); 1901 qapi_free_Netdev(nd->nd); 1902 g_free(nd); 1903 } 1904 } 1905 1906 void net_init_clients(void) 1907 { 1908 net_change_state_entry = 1909 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1910 1911 QTAILQ_INIT(&net_clients); 1912 1913 netdev_init_modern(); 1914 1915 qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1916 &error_fatal); 1917 1918 qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, 1919 &error_fatal); 1920 1921 qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, 1922 &error_fatal); 1923 } 1924 1925 /* 1926 * Does this -netdev argument use modern rather than traditional syntax? 1927 * Modern syntax is to be parsed with netdev_parse_modern(). 1928 * Traditional syntax is to be parsed with net_client_parse(). 1929 */ 1930 bool netdev_is_modern(const char *optstr) 1931 { 1932 QemuOpts *opts; 1933 bool is_modern; 1934 const char *type; 1935 static QemuOptsList dummy_opts = { 1936 .name = "netdev", 1937 .implied_opt_name = "type", 1938 .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), 1939 .desc = { { } }, 1940 }; 1941 1942 if (optstr[0] == '{') { 1943 /* This is JSON, which means it's modern syntax */ 1944 return true; 1945 } 1946 1947 opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); 1948 qemu_opts_do_parse(opts, optstr, dummy_opts.implied_opt_name, 1949 &error_abort); 1950 type = qemu_opt_get(opts, "type"); 1951 is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); 1952 1953 qemu_opts_reset(&dummy_opts); 1954 1955 return is_modern; 1956 } 1957 1958 /* 1959 * netdev_parse_modern() uses modern, more expressive syntax than 1960 * net_client_parse(), but supports only the -netdev option. 1961 * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() 1962 * appends to @qemu_netdev_opts. 1963 */ 1964 void netdev_parse_modern(const char *optstr) 1965 { 1966 Visitor *v; 1967 NetdevQueueEntry *nd; 1968 1969 v = qobject_input_visitor_new_str(optstr, "type", &error_fatal); 1970 nd = g_new(NetdevQueueEntry, 1); 1971 visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); 1972 visit_free(v); 1973 loc_save(&nd->loc); 1974 1975 QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); 1976 } 1977 1978 void net_client_parse(QemuOptsList *opts_list, const char *optstr) 1979 { 1980 if (!qemu_opts_parse_noisily(opts_list, optstr, true)) { 1981 exit(1); 1982 } 1983 } 1984 1985 /* From FreeBSD */ 1986 /* XXX: optimize */ 1987 uint32_t net_crc32(const uint8_t *p, int len) 1988 { 1989 uint32_t crc; 1990 int carry, i, j; 1991 uint8_t b; 1992 1993 crc = 0xffffffff; 1994 for (i = 0; i < len; i++) { 1995 b = *p++; 1996 for (j = 0; j < 8; j++) { 1997 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1998 crc <<= 1; 1999 b >>= 1; 2000 if (carry) { 2001 crc = ((crc ^ POLYNOMIAL_BE) | carry); 2002 } 2003 } 2004 } 2005 2006 return crc; 2007 } 2008 2009 uint32_t net_crc32_le(const uint8_t *p, int len) 2010 { 2011 uint32_t crc; 2012 int carry, i, j; 2013 uint8_t b; 2014 2015 crc = 0xffffffff; 2016 for (i = 0; i < len; i++) { 2017 b = *p++; 2018 for (j = 0; j < 8; j++) { 2019 carry = (crc & 0x1) ^ (b & 0x01); 2020 crc >>= 1; 2021 b >>= 1; 2022 if (carry) { 2023 crc ^= POLYNOMIAL_LE; 2024 } 2025 } 2026 } 2027 2028 return crc; 2029 } 2030 2031 QemuOptsList qemu_netdev_opts = { 2032 .name = "netdev", 2033 .implied_opt_name = "type", 2034 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 2035 .desc = { 2036 /* 2037 * no elements => accept any params 2038 * validation will happen later 2039 */ 2040 { /* end of list */ } 2041 }, 2042 }; 2043 2044 QemuOptsList qemu_nic_opts = { 2045 .name = "nic", 2046 .implied_opt_name = "type", 2047 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 2048 .desc = { 2049 /* 2050 * no elements => accept any params 2051 * validation will happen later 2052 */ 2053 { /* end of list */ } 2054 }, 2055 }; 2056 2057 QemuOptsList qemu_net_opts = { 2058 .name = "net", 2059 .implied_opt_name = "type", 2060 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 2061 .desc = { 2062 /* 2063 * no elements => accept any params 2064 * validation will happen later 2065 */ 2066 { /* end of list */ } 2067 }, 2068 }; 2069 2070 void net_socket_rs_init(SocketReadState *rs, 2071 SocketReadStateFinalize *finalize, 2072 bool vnet_hdr) 2073 { 2074 rs->state = 0; 2075 rs->vnet_hdr = vnet_hdr; 2076 rs->index = 0; 2077 rs->packet_len = 0; 2078 rs->vnet_hdr_len = 0; 2079 memset(rs->buf, 0, sizeof(rs->buf)); 2080 rs->finalize = finalize; 2081 } 2082 2083 /* 2084 * Returns 2085 * 0: success 2086 * -1: error occurs 2087 */ 2088 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 2089 { 2090 unsigned int l; 2091 2092 while (size > 0) { 2093 /* Reassemble a packet from the network. 2094 * 0 = getting length. 2095 * 1 = getting vnet header length. 2096 * 2 = getting data. 2097 */ 2098 switch (rs->state) { 2099 case 0: 2100 l = 4 - rs->index; 2101 if (l > size) { 2102 l = size; 2103 } 2104 memcpy(rs->buf + rs->index, buf, l); 2105 buf += l; 2106 size -= l; 2107 rs->index += l; 2108 if (rs->index == 4) { 2109 /* got length */ 2110 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 2111 rs->index = 0; 2112 if (rs->vnet_hdr) { 2113 rs->state = 1; 2114 } else { 2115 rs->state = 2; 2116 rs->vnet_hdr_len = 0; 2117 } 2118 } 2119 break; 2120 case 1: 2121 l = 4 - rs->index; 2122 if (l > size) { 2123 l = size; 2124 } 2125 memcpy(rs->buf + rs->index, buf, l); 2126 buf += l; 2127 size -= l; 2128 rs->index += l; 2129 if (rs->index == 4) { 2130 /* got vnet header length */ 2131 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 2132 rs->index = 0; 2133 rs->state = 2; 2134 } 2135 break; 2136 case 2: 2137 l = rs->packet_len - rs->index; 2138 if (l > size) { 2139 l = size; 2140 } 2141 if (rs->index + l <= sizeof(rs->buf)) { 2142 memcpy(rs->buf + rs->index, buf, l); 2143 } else { 2144 fprintf(stderr, "serious error: oversized packet received," 2145 "connection terminated.\n"); 2146 rs->index = rs->state = 0; 2147 return -1; 2148 } 2149 2150 rs->index += l; 2151 buf += l; 2152 size -= l; 2153 if (rs->index >= rs->packet_len) { 2154 rs->index = 0; 2155 rs->state = 0; 2156 assert(rs->finalize); 2157 rs->finalize(rs); 2158 } 2159 break; 2160 } 2161 } 2162 2163 assert(size == 0); 2164 return 0; 2165 } 2166