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