1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 27 #include "net/net.h" 28 #include "clients.h" 29 #include "hub.h" 30 #include "hw/qdev-properties.h" 31 #include "net/slirp.h" 32 #include "net/eth.h" 33 #include "util.h" 34 35 #include "monitor/monitor.h" 36 #include "qemu/help_option.h" 37 #include "qapi/qapi-commands-net.h" 38 #include "qapi/qapi-visit-net.h" 39 #include "qapi/qmp/qdict.h" 40 #include "qapi/qmp/qerror.h" 41 #include "qemu/error-report.h" 42 #include "qemu/sockets.h" 43 #include "qemu/cutils.h" 44 #include "qemu/config-file.h" 45 #include "qemu/ctype.h" 46 #include "qemu/id.h" 47 #include "qemu/iov.h" 48 #include "qemu/qemu-print.h" 49 #include "qemu/main-loop.h" 50 #include "qemu/option.h" 51 #include "qemu/keyval.h" 52 #include "qapi/error.h" 53 #include "qapi/opts-visitor.h" 54 #include "sysemu/runstate.h" 55 #include "net/colo-compare.h" 56 #include "net/filter.h" 57 #include "qapi/string-output-visitor.h" 58 #include "qapi/qobject-input-visitor.h" 59 #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 } 826 827 if (nc->info->receive_iov) { 828 ret = nc->info->receive_iov(nc, iov, iovcnt); 829 } else { 830 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 831 } 832 833 if (owned_reentrancy_guard) { 834 owned_reentrancy_guard->engaged_in_io = false; 835 } 836 837 if (ret == 0) { 838 nc->receive_disabled = 1; 839 } 840 841 return ret; 842 } 843 844 ssize_t qemu_sendv_packet_async(NetClientState *sender, 845 const struct iovec *iov, int iovcnt, 846 NetPacketSent *sent_cb) 847 { 848 NetQueue *queue; 849 size_t size = iov_size(iov, iovcnt); 850 int ret; 851 852 if (size > NET_BUFSIZE) { 853 return size; 854 } 855 856 if (sender->link_down || !sender->peer) { 857 return size; 858 } 859 860 /* Let filters handle the packet first */ 861 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 862 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 863 if (ret) { 864 return ret; 865 } 866 867 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 868 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 869 if (ret) { 870 return ret; 871 } 872 873 queue = sender->peer->incoming_queue; 874 875 return qemu_net_queue_send_iov(queue, sender, 876 QEMU_NET_PACKET_FLAG_NONE, 877 iov, iovcnt, sent_cb); 878 } 879 880 ssize_t 881 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 882 { 883 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 884 } 885 886 NetClientState *qemu_find_netdev(const char *id) 887 { 888 NetClientState *nc; 889 890 QTAILQ_FOREACH(nc, &net_clients, next) { 891 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 892 continue; 893 if (!strcmp(nc->name, id)) { 894 return nc; 895 } 896 } 897 898 return NULL; 899 } 900 901 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 902 NetClientDriver type, int max) 903 { 904 NetClientState *nc; 905 int ret = 0; 906 907 QTAILQ_FOREACH(nc, &net_clients, next) { 908 if (nc->info->type == type) { 909 continue; 910 } 911 if (!id || !strcmp(nc->name, id)) { 912 if (ret < max) { 913 ncs[ret] = nc; 914 } 915 ret++; 916 } 917 } 918 919 return ret; 920 } 921 922 static int nic_get_free_idx(void) 923 { 924 int index; 925 926 for (index = 0; index < MAX_NICS; index++) 927 if (!nd_table[index].used) 928 return index; 929 return -1; 930 } 931 932 GPtrArray *qemu_get_nic_models(const char *device_type) 933 { 934 GPtrArray *nic_models = g_ptr_array_new(); 935 GSList *list = object_class_get_list_sorted(device_type, false); 936 937 while (list) { 938 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data, 939 TYPE_DEVICE); 940 GSList *next; 941 if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) && 942 dc->user_creatable) { 943 const char *name = object_class_get_name(list->data); 944 /* 945 * A network device might also be something else than a NIC, see 946 * e.g. the "rocker" device. Thus we have to look for the "netdev" 947 * property, too. Unfortunately, some devices like virtio-net only 948 * create this property during instance_init, so we have to create 949 * a temporary instance here to be able to check it. 950 */ 951 Object *obj = object_new_with_class(OBJECT_CLASS(dc)); 952 if (object_property_find(obj, "netdev")) { 953 g_ptr_array_add(nic_models, (gpointer)name); 954 } 955 object_unref(obj); 956 } 957 next = list->next; 958 g_slist_free_1(list); 959 list = next; 960 } 961 g_ptr_array_add(nic_models, NULL); 962 963 return nic_models; 964 } 965 966 static int net_init_nic(const Netdev *netdev, const char *name, 967 NetClientState *peer, Error **errp) 968 { 969 int idx; 970 NICInfo *nd; 971 const NetLegacyNicOptions *nic; 972 973 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 974 nic = &netdev->u.nic; 975 976 idx = nic_get_free_idx(); 977 if (idx == -1 || nb_nics >= MAX_NICS) { 978 error_setg(errp, "too many NICs"); 979 return -1; 980 } 981 982 nd = &nd_table[idx]; 983 984 memset(nd, 0, sizeof(*nd)); 985 986 if (nic->netdev) { 987 nd->netdev = qemu_find_netdev(nic->netdev); 988 if (!nd->netdev) { 989 error_setg(errp, "netdev '%s' not found", nic->netdev); 990 return -1; 991 } 992 } else { 993 assert(peer); 994 nd->netdev = peer; 995 } 996 nd->name = g_strdup(name); 997 if (nic->model) { 998 nd->model = g_strdup(nic->model); 999 } 1000 if (nic->addr) { 1001 nd->devaddr = g_strdup(nic->addr); 1002 } 1003 1004 if (nic->macaddr && 1005 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 1006 error_setg(errp, "invalid syntax for ethernet address"); 1007 return -1; 1008 } 1009 if (nic->macaddr && 1010 is_multicast_ether_addr(nd->macaddr.a)) { 1011 error_setg(errp, 1012 "NIC cannot have multicast MAC address (odd 1st byte)"); 1013 return -1; 1014 } 1015 qemu_macaddr_default_if_unset(&nd->macaddr); 1016 1017 if (nic->has_vectors) { 1018 if (nic->vectors > 0x7ffffff) { 1019 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 1020 return -1; 1021 } 1022 nd->nvectors = nic->vectors; 1023 } else { 1024 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 1025 } 1026 1027 nd->used = 1; 1028 nb_nics++; 1029 1030 return idx; 1031 } 1032 1033 static gboolean add_nic_result(gpointer key, gpointer value, gpointer user_data) 1034 { 1035 GPtrArray *results = user_data; 1036 GPtrArray *alias_list = value; 1037 const char *model = key; 1038 char *result; 1039 1040 if (!alias_list) { 1041 result = g_strdup(model); 1042 } else { 1043 GString *result_str = g_string_new(model); 1044 int i; 1045 1046 g_string_append(result_str, " (aka "); 1047 for (i = 0; i < alias_list->len; i++) { 1048 if (i) { 1049 g_string_append(result_str, ", "); 1050 } 1051 g_string_append(result_str, alias_list->pdata[i]); 1052 } 1053 g_string_append(result_str, ")"); 1054 result = result_str->str; 1055 g_string_free(result_str, false); 1056 g_ptr_array_unref(alias_list); 1057 } 1058 g_ptr_array_add(results, result); 1059 return true; 1060 } 1061 1062 static int model_cmp(char **a, char **b) 1063 { 1064 return strcmp(*a, *b); 1065 } 1066 1067 static void show_nic_models(void) 1068 { 1069 GPtrArray *results = g_ptr_array_new(); 1070 int i; 1071 1072 g_hash_table_foreach_remove(nic_model_help, add_nic_result, results); 1073 g_ptr_array_sort(results, (GCompareFunc)model_cmp); 1074 1075 printf("Available NIC models for this configuration:\n"); 1076 for (i = 0 ; i < results->len; i++) { 1077 printf("%s\n", (char *)results->pdata[i]); 1078 } 1079 g_hash_table_unref(nic_model_help); 1080 nic_model_help = NULL; 1081 } 1082 1083 static void add_nic_model_help(const char *model, const char *alias) 1084 { 1085 GPtrArray *alias_list = NULL; 1086 1087 if (g_hash_table_lookup_extended(nic_model_help, model, NULL, 1088 (gpointer *)&alias_list)) { 1089 /* Already exists, no alias to add: return */ 1090 if (!alias) { 1091 return; 1092 } 1093 if (alias_list) { 1094 /* Check if this alias is already in the list. Add if not. */ 1095 if (!g_ptr_array_find_with_equal_func(alias_list, alias, 1096 g_str_equal, NULL)) { 1097 g_ptr_array_add(alias_list, g_strdup(alias)); 1098 } 1099 return; 1100 } 1101 } 1102 /* Either this model wasn't in the list already, or a first alias added */ 1103 if (alias) { 1104 alias_list = g_ptr_array_new(); 1105 g_ptr_array_set_free_func(alias_list, g_free); 1106 g_ptr_array_add(alias_list, g_strdup(alias)); 1107 } 1108 g_hash_table_replace(nic_model_help, g_strdup(model), alias_list); 1109 } 1110 1111 NICInfo *qemu_find_nic_info(const char *typename, bool match_default, 1112 const char *alias) 1113 { 1114 NICInfo *nd; 1115 int i; 1116 1117 if (nic_model_help) { 1118 add_nic_model_help(typename, alias); 1119 } 1120 1121 for (i = 0; i < nb_nics; i++) { 1122 nd = &nd_table[i]; 1123 1124 if (!nd->used || nd->instantiated) { 1125 continue; 1126 } 1127 1128 if ((match_default && !nd->model) || !g_strcmp0(nd->model, typename) 1129 || (alias && !g_strcmp0(nd->model, alias))) { 1130 return nd; 1131 } 1132 } 1133 return NULL; 1134 } 1135 1136 static bool is_nic_model_help_option(const char *model) 1137 { 1138 if (model && is_help_option(model)) { 1139 /* 1140 * Trigger the help output by instantiating the hash table which 1141 * will gather tha available models as they get registered. 1142 */ 1143 if (!nic_model_help) { 1144 nic_model_help = g_hash_table_new_full(g_str_hash, g_str_equal, 1145 g_free, NULL); 1146 } 1147 return true; 1148 } 1149 return false; 1150 } 1151 1152 /* "I have created a device. Please configure it if you can" */ 1153 bool qemu_configure_nic_device(DeviceState *dev, bool match_default, 1154 const char *alias) 1155 { 1156 NICInfo *nd = qemu_find_nic_info(object_get_typename(OBJECT(dev)), 1157 match_default, alias); 1158 1159 if (nd) { 1160 qdev_set_nic_properties(dev, nd); 1161 return true; 1162 } 1163 return false; 1164 } 1165 1166 /* "Please create a device, if you have a configuration for it" */ 1167 DeviceState *qemu_create_nic_device(const char *typename, bool match_default, 1168 const char *alias) 1169 { 1170 NICInfo *nd = qemu_find_nic_info(typename, match_default, alias); 1171 DeviceState *dev; 1172 1173 if (!nd) { 1174 return NULL; 1175 } 1176 1177 dev = qdev_new(typename); 1178 qdev_set_nic_properties(dev, nd); 1179 return dev; 1180 } 1181 1182 void qemu_create_nic_bus_devices(BusState *bus, const char *parent_type, 1183 const char *default_model, 1184 const char *alias, const char *alias_target) 1185 { 1186 GPtrArray *nic_models = qemu_get_nic_models(parent_type); 1187 const char *model; 1188 DeviceState *dev; 1189 NICInfo *nd; 1190 int i; 1191 1192 if (nic_model_help) { 1193 if (alias_target) { 1194 add_nic_model_help(alias_target, alias); 1195 } 1196 for (i = 0; i < nic_models->len - 1; i++) { 1197 add_nic_model_help(nic_models->pdata[i], NULL); 1198 } 1199 } 1200 1201 /* Drop the NULL terminator which would make g_str_equal() unhappy */ 1202 nic_models->len--; 1203 1204 for (i = 0; i < nb_nics; i++) { 1205 nd = &nd_table[i]; 1206 1207 if (!nd->used || nd->instantiated) { 1208 continue; 1209 } 1210 1211 model = nd->model ? nd->model : default_model; 1212 if (!model) { 1213 continue; 1214 } 1215 1216 /* Each bus type is allowed *one* substitution */ 1217 if (g_str_equal(model, alias)) { 1218 model = alias_target; 1219 } 1220 1221 if (!g_ptr_array_find_with_equal_func(nic_models, model, 1222 g_str_equal, NULL)) { 1223 /* This NIC does not live on this bus. */ 1224 continue; 1225 } 1226 1227 dev = qdev_new(model); 1228 qdev_set_nic_properties(dev, nd); 1229 qdev_realize_and_unref(dev, bus, &error_fatal); 1230 } 1231 1232 g_ptr_array_free(nic_models, true); 1233 } 1234 1235 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 1236 const Netdev *netdev, 1237 const char *name, 1238 NetClientState *peer, Error **errp) = { 1239 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 1240 #ifdef CONFIG_SLIRP 1241 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1242 #endif 1243 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1244 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1245 [NET_CLIENT_DRIVER_STREAM] = net_init_stream, 1246 [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, 1247 #ifdef CONFIG_VDE 1248 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1249 #endif 1250 #ifdef CONFIG_NETMAP 1251 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1252 #endif 1253 #ifdef CONFIG_AF_XDP 1254 [NET_CLIENT_DRIVER_AF_XDP] = net_init_af_xdp, 1255 #endif 1256 #ifdef CONFIG_NET_BRIDGE 1257 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1258 #endif 1259 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1260 #ifdef CONFIG_VHOST_NET_USER 1261 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1262 #endif 1263 #ifdef CONFIG_VHOST_NET_VDPA 1264 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1265 #endif 1266 #ifdef CONFIG_L2TPV3 1267 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1268 #endif 1269 #ifdef CONFIG_VMNET 1270 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1271 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1272 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1273 #endif /* CONFIG_VMNET */ 1274 }; 1275 1276 1277 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1278 { 1279 NetClientState *peer = NULL; 1280 NetClientState *nc; 1281 1282 if (is_netdev) { 1283 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1284 !net_client_init_fun[netdev->type]) { 1285 error_setg(errp, "network backend '%s' is not compiled into this binary", 1286 NetClientDriver_str(netdev->type)); 1287 return -1; 1288 } 1289 } else { 1290 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1291 return 0; /* nothing to do */ 1292 } 1293 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { 1294 error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", 1295 NetClientDriver_str(netdev->type)); 1296 return -1; 1297 } 1298 1299 if (!net_client_init_fun[netdev->type]) { 1300 error_setg(errp, "network backend '%s' is not compiled into this binary", 1301 NetClientDriver_str(netdev->type)); 1302 return -1; 1303 } 1304 1305 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1306 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1307 !netdev->u.nic.netdev) { 1308 peer = net_hub_add_port(0, NULL, NULL); 1309 } 1310 } 1311 1312 nc = qemu_find_netdev(netdev->id); 1313 if (nc) { 1314 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1315 return -1; 1316 } 1317 1318 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1319 /* FIXME drop when all init functions store an Error */ 1320 if (errp && !*errp) { 1321 error_setg(errp, "Device '%s' could not be initialized", 1322 NetClientDriver_str(netdev->type)); 1323 } 1324 return -1; 1325 } 1326 1327 if (is_netdev) { 1328 nc = qemu_find_netdev(netdev->id); 1329 assert(nc); 1330 nc->is_netdev = true; 1331 } 1332 1333 return 0; 1334 } 1335 1336 void show_netdevs(void) 1337 { 1338 int idx; 1339 const char *available_netdevs[] = { 1340 "socket", 1341 "stream", 1342 "dgram", 1343 "hubport", 1344 "tap", 1345 #ifdef CONFIG_SLIRP 1346 "user", 1347 #endif 1348 #ifdef CONFIG_L2TPV3 1349 "l2tpv3", 1350 #endif 1351 #ifdef CONFIG_VDE 1352 "vde", 1353 #endif 1354 #ifdef CONFIG_NET_BRIDGE 1355 "bridge", 1356 #endif 1357 #ifdef CONFIG_NETMAP 1358 "netmap", 1359 #endif 1360 #ifdef CONFIG_AF_XDP 1361 "af-xdp", 1362 #endif 1363 #ifdef CONFIG_POSIX 1364 "vhost-user", 1365 #endif 1366 #ifdef CONFIG_VHOST_VDPA 1367 "vhost-vdpa", 1368 #endif 1369 #ifdef CONFIG_VMNET 1370 "vmnet-host", 1371 "vmnet-shared", 1372 "vmnet-bridged", 1373 #endif 1374 }; 1375 1376 qemu_printf("Available netdev backend types:\n"); 1377 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1378 qemu_printf("%s\n", available_netdevs[idx]); 1379 } 1380 } 1381 1382 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1383 { 1384 gchar **substrings = NULL; 1385 Netdev *object = NULL; 1386 int ret = -1; 1387 Visitor *v = opts_visitor_new(opts); 1388 1389 /* Parse convenience option format ipv6-net=fec0::0[/64] */ 1390 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1391 1392 if (ip6_net) { 1393 char *prefix_addr; 1394 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1395 1396 substrings = g_strsplit(ip6_net, "/", 2); 1397 if (!substrings || !substrings[0]) { 1398 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1399 "a valid IPv6 prefix"); 1400 goto out; 1401 } 1402 1403 prefix_addr = substrings[0]; 1404 1405 /* Handle user-specified prefix length. */ 1406 if (substrings[1] && 1407 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1408 { 1409 error_setg(errp, 1410 "parameter 'ipv6-net' expects a number after '/'"); 1411 goto out; 1412 } 1413 1414 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1415 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1416 &error_abort); 1417 qemu_opt_unset(opts, "ipv6-net"); 1418 } 1419 1420 /* Create an ID for -net if the user did not specify one */ 1421 if (!is_netdev && !qemu_opts_id(opts)) { 1422 qemu_opts_set_id(opts, id_generate(ID_NET)); 1423 } 1424 1425 if (visit_type_Netdev(v, NULL, &object, errp)) { 1426 ret = net_client_init1(object, is_netdev, errp); 1427 } 1428 1429 qapi_free_Netdev(object); 1430 1431 out: 1432 g_strfreev(substrings); 1433 visit_free(v); 1434 return ret; 1435 } 1436 1437 void netdev_add(QemuOpts *opts, Error **errp) 1438 { 1439 net_client_init(opts, true, errp); 1440 } 1441 1442 void qmp_netdev_add(Netdev *netdev, Error **errp) 1443 { 1444 if (!id_wellformed(netdev->id)) { 1445 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1446 return; 1447 } 1448 1449 net_client_init1(netdev, true, errp); 1450 } 1451 1452 void qmp_netdev_del(const char *id, Error **errp) 1453 { 1454 NetClientState *nc; 1455 QemuOpts *opts; 1456 1457 nc = qemu_find_netdev(id); 1458 if (!nc) { 1459 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1460 "Device '%s' not found", id); 1461 return; 1462 } 1463 1464 if (!nc->is_netdev) { 1465 error_setg(errp, "Device '%s' is not a netdev", id); 1466 return; 1467 } 1468 1469 qemu_del_net_client(nc); 1470 1471 /* 1472 * Wart: we need to delete the QemuOpts associated with netdevs 1473 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1474 * HMP netdev_add. 1475 */ 1476 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1477 if (opts) { 1478 qemu_opts_del(opts); 1479 } 1480 } 1481 1482 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1483 { 1484 char *str; 1485 ObjectProperty *prop; 1486 ObjectPropertyIterator iter; 1487 Visitor *v; 1488 1489 /* generate info str */ 1490 object_property_iter_init(&iter, OBJECT(nf)); 1491 while ((prop = object_property_iter_next(&iter))) { 1492 if (!strcmp(prop->name, "type")) { 1493 continue; 1494 } 1495 v = string_output_visitor_new(false, &str); 1496 object_property_get(OBJECT(nf), prop->name, v, NULL); 1497 visit_complete(v, &str); 1498 visit_free(v); 1499 monitor_printf(mon, ",%s=%s", prop->name, str); 1500 g_free(str); 1501 } 1502 monitor_printf(mon, "\n"); 1503 } 1504 1505 void print_net_client(Monitor *mon, NetClientState *nc) 1506 { 1507 NetFilterState *nf; 1508 1509 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1510 nc->queue_index, 1511 NetClientDriver_str(nc->info->type), 1512 nc->info_str); 1513 if (!QTAILQ_EMPTY(&nc->filters)) { 1514 monitor_printf(mon, "filters:\n"); 1515 } 1516 QTAILQ_FOREACH(nf, &nc->filters, next) { 1517 monitor_printf(mon, " - %s: type=%s", 1518 object_get_canonical_path_component(OBJECT(nf)), 1519 object_get_typename(OBJECT(nf))); 1520 netfilter_print_info(mon, nf); 1521 } 1522 } 1523 1524 RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp) 1525 { 1526 NetClientState *nc; 1527 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1528 1529 QTAILQ_FOREACH(nc, &net_clients, next) { 1530 RxFilterInfo *info; 1531 1532 if (name && strcmp(nc->name, name) != 0) { 1533 continue; 1534 } 1535 1536 /* only query rx-filter information of NIC */ 1537 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1538 if (name) { 1539 error_setg(errp, "net client(%s) isn't a NIC", name); 1540 assert(!filter_list); 1541 return NULL; 1542 } 1543 continue; 1544 } 1545 1546 /* only query information on queue 0 since the info is per nic, 1547 * not per queue 1548 */ 1549 if (nc->queue_index != 0) 1550 continue; 1551 1552 if (nc->info->query_rx_filter) { 1553 info = nc->info->query_rx_filter(nc); 1554 QAPI_LIST_APPEND(tail, info); 1555 } else if (name) { 1556 error_setg(errp, "net client(%s) doesn't support" 1557 " rx-filter querying", name); 1558 assert(!filter_list); 1559 return NULL; 1560 } 1561 1562 if (name) { 1563 break; 1564 } 1565 } 1566 1567 if (filter_list == NULL && name) { 1568 error_setg(errp, "invalid net client name: %s", name); 1569 } 1570 1571 return filter_list; 1572 } 1573 1574 void colo_notify_filters_event(int event, Error **errp) 1575 { 1576 NetClientState *nc; 1577 NetFilterState *nf; 1578 NetFilterClass *nfc = NULL; 1579 Error *local_err = NULL; 1580 1581 QTAILQ_FOREACH(nc, &net_clients, next) { 1582 QTAILQ_FOREACH(nf, &nc->filters, next) { 1583 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1584 nfc->handle_event(nf, event, &local_err); 1585 if (local_err) { 1586 error_propagate(errp, local_err); 1587 return; 1588 } 1589 } 1590 } 1591 } 1592 1593 void qmp_set_link(const char *name, bool up, Error **errp) 1594 { 1595 NetClientState *ncs[MAX_QUEUE_NUM]; 1596 NetClientState *nc; 1597 int queues, i; 1598 1599 queues = qemu_find_net_clients_except(name, ncs, 1600 NET_CLIENT_DRIVER__MAX, 1601 MAX_QUEUE_NUM); 1602 1603 if (queues == 0) { 1604 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1605 "Device '%s' not found", name); 1606 return; 1607 } 1608 nc = ncs[0]; 1609 1610 for (i = 0; i < queues; i++) { 1611 ncs[i]->link_down = !up; 1612 } 1613 1614 if (nc->info->link_status_changed) { 1615 nc->info->link_status_changed(nc); 1616 } 1617 1618 if (nc->peer) { 1619 /* Change peer link only if the peer is NIC and then notify peer. 1620 * If the peer is a HUBPORT or a backend, we do not change the 1621 * link status. 1622 * 1623 * This behavior is compatible with qemu hubs where there could be 1624 * multiple clients that can still communicate with each other in 1625 * disconnected mode. For now maintain this compatibility. 1626 */ 1627 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1628 for (i = 0; i < queues; i++) { 1629 ncs[i]->peer->link_down = !up; 1630 } 1631 } 1632 if (nc->peer->info->link_status_changed) { 1633 nc->peer->info->link_status_changed(nc->peer); 1634 } 1635 } 1636 } 1637 1638 static void net_vm_change_state_handler(void *opaque, bool running, 1639 RunState state) 1640 { 1641 NetClientState *nc; 1642 NetClientState *tmp; 1643 1644 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1645 if (running) { 1646 /* Flush queued packets and wake up backends. */ 1647 if (nc->peer && qemu_can_send_packet(nc)) { 1648 qemu_flush_queued_packets(nc->peer); 1649 } 1650 } else { 1651 /* Complete all queued packets, to guarantee we don't modify 1652 * state later when VM is not running. 1653 */ 1654 qemu_flush_or_purge_queued_packets(nc, true); 1655 } 1656 } 1657 } 1658 1659 void net_cleanup(void) 1660 { 1661 NetClientState *nc, **p = &QTAILQ_FIRST(&net_clients); 1662 1663 /*cleanup colo compare module for COLO*/ 1664 colo_compare_cleanup(); 1665 1666 /* 1667 * Walk the net_clients list and remove the netdevs but *not* any 1668 * NET_CLIENT_DRIVER_NIC entries. The latter are owned by the device 1669 * model which created them, and in some cases (e.g. xen-net-device) 1670 * the device itself may do cleanup at exit and will be upset if we 1671 * just delete its NIC from underneath it. 1672 * 1673 * Since qemu_del_net_client() may delete multiple entries, using 1674 * QTAILQ_FOREACH_SAFE() is not safe here. The only safe pointer 1675 * to keep as a bookmark is a NET_CLIENT_DRIVER_NIC entry, so keep 1676 * 'p' pointing to either the head of the list, or the 'next' field 1677 * of the latest NET_CLIENT_DRIVER_NIC, and operate on *p as we walk 1678 * the list. 1679 * 1680 * The 'nc' variable isn't part of the list traversal; it's purely 1681 * for convenience as too much '(*p)->' has a tendency to make the 1682 * readers' eyes bleed. 1683 */ 1684 while (*p) { 1685 nc = *p; 1686 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1687 /* Skip NET_CLIENT_DRIVER_NIC entries */ 1688 p = &QTAILQ_NEXT(nc, next); 1689 } else { 1690 qemu_del_net_client(nc); 1691 } 1692 } 1693 1694 qemu_del_vm_change_state_handler(net_change_state_entry); 1695 } 1696 1697 void net_check_clients(void) 1698 { 1699 NetClientState *nc; 1700 int i; 1701 1702 if (nic_model_help) { 1703 show_nic_models(); 1704 exit(0); 1705 } 1706 net_hub_check_clients(); 1707 1708 QTAILQ_FOREACH(nc, &net_clients, next) { 1709 if (!nc->peer) { 1710 warn_report("%s %s has no peer", 1711 nc->info->type == NET_CLIENT_DRIVER_NIC 1712 ? "nic" : "netdev", 1713 nc->name); 1714 } 1715 } 1716 1717 /* Check that all NICs requested via -net nic actually got created. 1718 * NICs created via -device don't need to be checked here because 1719 * they are always instantiated. 1720 */ 1721 for (i = 0; i < MAX_NICS; i++) { 1722 NICInfo *nd = &nd_table[i]; 1723 if (nd->used && !nd->instantiated) { 1724 warn_report("requested NIC (%s, model %s) " 1725 "was not created (not supported by this machine?)", 1726 nd->name ? nd->name : "anonymous", 1727 nd->model ? nd->model : "unspecified"); 1728 } 1729 } 1730 } 1731 1732 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1733 { 1734 const char *model = qemu_opt_get(opts, "model"); 1735 1736 if (is_nic_model_help_option(model)) { 1737 return 0; 1738 } 1739 1740 return net_client_init(opts, false, errp); 1741 } 1742 1743 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1744 { 1745 const char *type = qemu_opt_get(opts, "type"); 1746 1747 if (type && is_help_option(type)) { 1748 show_netdevs(); 1749 exit(0); 1750 } 1751 return net_client_init(opts, true, errp); 1752 } 1753 1754 /* For the convenience "--nic" parameter */ 1755 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1756 { 1757 char *mac, *nd_id; 1758 int idx, ret; 1759 NICInfo *ni; 1760 const char *type; 1761 1762 type = qemu_opt_get(opts, "type"); 1763 if (type) { 1764 if (g_str_equal(type, "none")) { 1765 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1766 } 1767 if (is_help_option(type)) { 1768 GPtrArray *nic_models = qemu_get_nic_models(TYPE_DEVICE); 1769 int i; 1770 show_netdevs(); 1771 printf("\n"); 1772 printf("Available NIC models " 1773 "(use -nic model=help for a filtered list):\n"); 1774 for (i = 0 ; nic_models->pdata[i]; i++) { 1775 printf("%s\n", (char *)nic_models->pdata[i]); 1776 } 1777 g_ptr_array_free(nic_models, true); 1778 exit(0); 1779 } 1780 } 1781 1782 idx = nic_get_free_idx(); 1783 if (idx == -1 || nb_nics >= MAX_NICS) { 1784 error_setg(errp, "no more on-board/default NIC slots available"); 1785 return -1; 1786 } 1787 1788 if (!type) { 1789 qemu_opt_set(opts, "type", "user", &error_abort); 1790 } 1791 1792 ni = &nd_table[idx]; 1793 memset(ni, 0, sizeof(*ni)); 1794 ni->model = qemu_opt_get_del(opts, "model"); 1795 1796 if (is_nic_model_help_option(ni->model)) { 1797 return 0; 1798 } 1799 1800 /* Create an ID if the user did not specify one */ 1801 nd_id = g_strdup(qemu_opts_id(opts)); 1802 if (!nd_id) { 1803 nd_id = id_generate(ID_NET); 1804 qemu_opts_set_id(opts, nd_id); 1805 } 1806 1807 /* Handle MAC address */ 1808 mac = qemu_opt_get_del(opts, "mac"); 1809 if (mac) { 1810 ret = net_parse_macaddr(ni->macaddr.a, mac); 1811 g_free(mac); 1812 if (ret) { 1813 error_setg(errp, "invalid syntax for ethernet address"); 1814 goto out; 1815 } 1816 if (is_multicast_ether_addr(ni->macaddr.a)) { 1817 error_setg(errp, "NIC cannot have multicast MAC address"); 1818 ret = -1; 1819 goto out; 1820 } 1821 } 1822 qemu_macaddr_default_if_unset(&ni->macaddr); 1823 1824 ret = net_client_init(opts, true, errp); 1825 if (ret == 0) { 1826 ni->netdev = qemu_find_netdev(nd_id); 1827 ni->used = true; 1828 nb_nics++; 1829 } 1830 1831 out: 1832 g_free(nd_id); 1833 return ret; 1834 } 1835 1836 static void netdev_init_modern(void) 1837 { 1838 while (!QSIMPLEQ_EMPTY(&nd_queue)) { 1839 NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); 1840 1841 QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); 1842 loc_push_restore(&nd->loc); 1843 net_client_init1(nd->nd, true, &error_fatal); 1844 loc_pop(&nd->loc); 1845 qapi_free_Netdev(nd->nd); 1846 g_free(nd); 1847 } 1848 } 1849 1850 void net_init_clients(void) 1851 { 1852 net_change_state_entry = 1853 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1854 1855 QTAILQ_INIT(&net_clients); 1856 1857 netdev_init_modern(); 1858 1859 qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1860 &error_fatal); 1861 1862 qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, 1863 &error_fatal); 1864 1865 qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, 1866 &error_fatal); 1867 } 1868 1869 /* 1870 * Does this -netdev argument use modern rather than traditional syntax? 1871 * Modern syntax is to be parsed with netdev_parse_modern(). 1872 * Traditional syntax is to be parsed with net_client_parse(). 1873 */ 1874 bool netdev_is_modern(const char *optstr) 1875 { 1876 QemuOpts *opts; 1877 bool is_modern; 1878 const char *type; 1879 static QemuOptsList dummy_opts = { 1880 .name = "netdev", 1881 .implied_opt_name = "type", 1882 .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), 1883 .desc = { { } }, 1884 }; 1885 1886 if (optstr[0] == '{') { 1887 /* This is JSON, which means it's modern syntax */ 1888 return true; 1889 } 1890 1891 opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); 1892 qemu_opts_do_parse(opts, optstr, dummy_opts.implied_opt_name, 1893 &error_abort); 1894 type = qemu_opt_get(opts, "type"); 1895 is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); 1896 1897 qemu_opts_reset(&dummy_opts); 1898 1899 return is_modern; 1900 } 1901 1902 /* 1903 * netdev_parse_modern() uses modern, more expressive syntax than 1904 * net_client_parse(), but supports only the -netdev option. 1905 * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() 1906 * appends to @qemu_netdev_opts. 1907 */ 1908 void netdev_parse_modern(const char *optstr) 1909 { 1910 Visitor *v; 1911 NetdevQueueEntry *nd; 1912 1913 v = qobject_input_visitor_new_str(optstr, "type", &error_fatal); 1914 nd = g_new(NetdevQueueEntry, 1); 1915 visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); 1916 visit_free(v); 1917 loc_save(&nd->loc); 1918 1919 QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); 1920 } 1921 1922 void net_client_parse(QemuOptsList *opts_list, const char *optstr) 1923 { 1924 if (!qemu_opts_parse_noisily(opts_list, optstr, true)) { 1925 exit(1); 1926 } 1927 } 1928 1929 /* From FreeBSD */ 1930 /* XXX: optimize */ 1931 uint32_t net_crc32(const uint8_t *p, int len) 1932 { 1933 uint32_t crc; 1934 int carry, i, j; 1935 uint8_t b; 1936 1937 crc = 0xffffffff; 1938 for (i = 0; i < len; i++) { 1939 b = *p++; 1940 for (j = 0; j < 8; j++) { 1941 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1942 crc <<= 1; 1943 b >>= 1; 1944 if (carry) { 1945 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1946 } 1947 } 1948 } 1949 1950 return crc; 1951 } 1952 1953 uint32_t net_crc32_le(const uint8_t *p, int len) 1954 { 1955 uint32_t crc; 1956 int carry, i, j; 1957 uint8_t b; 1958 1959 crc = 0xffffffff; 1960 for (i = 0; i < len; i++) { 1961 b = *p++; 1962 for (j = 0; j < 8; j++) { 1963 carry = (crc & 0x1) ^ (b & 0x01); 1964 crc >>= 1; 1965 b >>= 1; 1966 if (carry) { 1967 crc ^= POLYNOMIAL_LE; 1968 } 1969 } 1970 } 1971 1972 return crc; 1973 } 1974 1975 QemuOptsList qemu_netdev_opts = { 1976 .name = "netdev", 1977 .implied_opt_name = "type", 1978 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1979 .desc = { 1980 /* 1981 * no elements => accept any params 1982 * validation will happen later 1983 */ 1984 { /* end of list */ } 1985 }, 1986 }; 1987 1988 QemuOptsList qemu_nic_opts = { 1989 .name = "nic", 1990 .implied_opt_name = "type", 1991 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1992 .desc = { 1993 /* 1994 * no elements => accept any params 1995 * validation will happen later 1996 */ 1997 { /* end of list */ } 1998 }, 1999 }; 2000 2001 QemuOptsList qemu_net_opts = { 2002 .name = "net", 2003 .implied_opt_name = "type", 2004 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 2005 .desc = { 2006 /* 2007 * no elements => accept any params 2008 * validation will happen later 2009 */ 2010 { /* end of list */ } 2011 }, 2012 }; 2013 2014 void net_socket_rs_init(SocketReadState *rs, 2015 SocketReadStateFinalize *finalize, 2016 bool vnet_hdr) 2017 { 2018 rs->state = 0; 2019 rs->vnet_hdr = vnet_hdr; 2020 rs->index = 0; 2021 rs->packet_len = 0; 2022 rs->vnet_hdr_len = 0; 2023 memset(rs->buf, 0, sizeof(rs->buf)); 2024 rs->finalize = finalize; 2025 } 2026 2027 /* 2028 * Returns 2029 * 0: success 2030 * -1: error occurs 2031 */ 2032 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 2033 { 2034 unsigned int l; 2035 2036 while (size > 0) { 2037 /* Reassemble a packet from the network. 2038 * 0 = getting length. 2039 * 1 = getting vnet header length. 2040 * 2 = getting data. 2041 */ 2042 switch (rs->state) { 2043 case 0: 2044 l = 4 - rs->index; 2045 if (l > size) { 2046 l = size; 2047 } 2048 memcpy(rs->buf + rs->index, buf, l); 2049 buf += l; 2050 size -= l; 2051 rs->index += l; 2052 if (rs->index == 4) { 2053 /* got length */ 2054 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 2055 rs->index = 0; 2056 if (rs->vnet_hdr) { 2057 rs->state = 1; 2058 } else { 2059 rs->state = 2; 2060 rs->vnet_hdr_len = 0; 2061 } 2062 } 2063 break; 2064 case 1: 2065 l = 4 - rs->index; 2066 if (l > size) { 2067 l = size; 2068 } 2069 memcpy(rs->buf + rs->index, buf, l); 2070 buf += l; 2071 size -= l; 2072 rs->index += l; 2073 if (rs->index == 4) { 2074 /* got vnet header length */ 2075 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 2076 rs->index = 0; 2077 rs->state = 2; 2078 } 2079 break; 2080 case 2: 2081 l = rs->packet_len - rs->index; 2082 if (l > size) { 2083 l = size; 2084 } 2085 if (rs->index + l <= sizeof(rs->buf)) { 2086 memcpy(rs->buf + rs->index, buf, l); 2087 } else { 2088 fprintf(stderr, "serious error: oversized packet received," 2089 "connection terminated.\n"); 2090 rs->index = rs->state = 0; 2091 return -1; 2092 } 2093 2094 rs->index += l; 2095 buf += l; 2096 size -= l; 2097 if (rs->index >= rs->packet_len) { 2098 rs->index = 0; 2099 rs->state = 0; 2100 assert(rs->finalize); 2101 rs->finalize(rs); 2102 } 2103 break; 2104 } 2105 } 2106 2107 assert(size == 0); 2108 return 0; 2109 } 2110