1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 27 #include "net/net.h" 28 #include "clients.h" 29 #include "hub.h" 30 #include "hw/qdev-properties.h" 31 #include "net/slirp.h" 32 #include "net/eth.h" 33 #include "util.h" 34 35 #include "monitor/monitor.h" 36 #include "qemu/help_option.h" 37 #include "qapi/qapi-commands-net.h" 38 #include "qapi/qapi-visit-net.h" 39 #include "qapi/qmp/qdict.h" 40 #include "qapi/qmp/qerror.h" 41 #include "qemu/error-report.h" 42 #include "qemu/sockets.h" 43 #include "qemu/cutils.h" 44 #include "qemu/config-file.h" 45 #include "qemu/ctype.h" 46 #include "qemu/id.h" 47 #include "qemu/iov.h" 48 #include "qemu/qemu-print.h" 49 #include "qemu/main-loop.h" 50 #include "qemu/option.h" 51 #include "qemu/keyval.h" 52 #include "qapi/error.h" 53 #include "qapi/opts-visitor.h" 54 #include "sysemu/runstate.h" 55 #include "net/colo-compare.h" 56 #include "net/filter.h" 57 #include "qapi/string-output-visitor.h" 58 #include "qapi/qobject-input-visitor.h" 59 60 /* Net bridge is currently not supported for W32. */ 61 #if !defined(_WIN32) 62 # define CONFIG_NET_BRIDGE 63 #endif 64 65 static VMChangeStateEntry *net_change_state_entry; 66 NetClientStateList net_clients; 67 68 typedef struct NetdevQueueEntry { 69 Netdev *nd; 70 Location loc; 71 QSIMPLEQ_ENTRY(NetdevQueueEntry) entry; 72 } NetdevQueueEntry; 73 74 typedef QSIMPLEQ_HEAD(, NetdevQueueEntry) NetdevQueue; 75 76 static NetdevQueue nd_queue = QSIMPLEQ_HEAD_INITIALIZER(nd_queue); 77 78 static GHashTable *nic_model_help; 79 80 static int nb_nics; 81 static NICInfo nd_table[MAX_NICS]; 82 83 /***********************************************************/ 84 /* network device redirectors */ 85 86 int convert_host_port(struct sockaddr_in *saddr, const char *host, 87 const char *port, Error **errp) 88 { 89 struct hostent *he; 90 const char *r; 91 long p; 92 93 memset(saddr, 0, sizeof(*saddr)); 94 95 saddr->sin_family = AF_INET; 96 if (host[0] == '\0') { 97 saddr->sin_addr.s_addr = 0; 98 } else { 99 if (qemu_isdigit(host[0])) { 100 if (!inet_aton(host, &saddr->sin_addr)) { 101 error_setg(errp, "host address '%s' is not a valid " 102 "IPv4 address", host); 103 return -1; 104 } 105 } else { 106 he = gethostbyname(host); 107 if (he == NULL) { 108 error_setg(errp, "can't resolve host address '%s'", host); 109 return -1; 110 } 111 saddr->sin_addr = *(struct in_addr *)he->h_addr; 112 } 113 } 114 if (qemu_strtol(port, &r, 0, &p) != 0) { 115 error_setg(errp, "port number '%s' is invalid", port); 116 return -1; 117 } 118 saddr->sin_port = htons(p); 119 return 0; 120 } 121 122 int parse_host_port(struct sockaddr_in *saddr, const char *str, 123 Error **errp) 124 { 125 gchar **substrings; 126 int ret; 127 128 substrings = g_strsplit(str, ":", 2); 129 if (!substrings || !substrings[0] || !substrings[1]) { 130 error_setg(errp, "host address '%s' doesn't contain ':' " 131 "separating host from port", str); 132 ret = -1; 133 goto out; 134 } 135 136 ret = convert_host_port(saddr, substrings[0], substrings[1], errp); 137 138 out: 139 g_strfreev(substrings); 140 return ret; 141 } 142 143 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 144 { 145 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 146 macaddr[0], macaddr[1], macaddr[2], 147 macaddr[3], macaddr[4], macaddr[5]); 148 } 149 150 void qemu_set_info_str(NetClientState *nc, const char *fmt, ...) 151 { 152 va_list ap; 153 154 va_start(ap, fmt); 155 vsnprintf(nc->info_str, sizeof(nc->info_str), fmt, ap); 156 va_end(ap); 157 } 158 159 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 160 { 161 qemu_set_info_str(nc, "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 162 nc->model, macaddr[0], macaddr[1], macaddr[2], 163 macaddr[3], macaddr[4], macaddr[5]); 164 } 165 166 static int mac_table[256] = {0}; 167 168 static void qemu_macaddr_set_used(MACAddr *macaddr) 169 { 170 int index; 171 172 for (index = 0x56; index < 0xFF; index++) { 173 if (macaddr->a[5] == index) { 174 mac_table[index]++; 175 } 176 } 177 } 178 179 static void qemu_macaddr_set_free(MACAddr *macaddr) 180 { 181 int index; 182 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 183 184 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 185 return; 186 } 187 for (index = 0x56; index < 0xFF; index++) { 188 if (macaddr->a[5] == index) { 189 mac_table[index]--; 190 } 191 } 192 } 193 194 static int qemu_macaddr_get_free(void) 195 { 196 int index; 197 198 for (index = 0x56; index < 0xFF; index++) { 199 if (mac_table[index] == 0) { 200 return index; 201 } 202 } 203 204 return -1; 205 } 206 207 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 208 { 209 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 210 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 211 212 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 213 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 214 return; 215 } else { 216 qemu_macaddr_set_used(macaddr); 217 return; 218 } 219 } 220 221 macaddr->a[0] = 0x52; 222 macaddr->a[1] = 0x54; 223 macaddr->a[2] = 0x00; 224 macaddr->a[3] = 0x12; 225 macaddr->a[4] = 0x34; 226 macaddr->a[5] = qemu_macaddr_get_free(); 227 qemu_macaddr_set_used(macaddr); 228 } 229 230 /** 231 * Generate a name for net client 232 * 233 * Only net clients created with the legacy -net option and NICs need this. 234 */ 235 static char *assign_name(NetClientState *nc1, const char *model) 236 { 237 NetClientState *nc; 238 int id = 0; 239 240 QTAILQ_FOREACH(nc, &net_clients, next) { 241 if (nc == nc1) { 242 continue; 243 } 244 if (strcmp(nc->model, model) == 0) { 245 id++; 246 } 247 } 248 249 return g_strdup_printf("%s.%d", model, id); 250 } 251 252 static void qemu_net_client_destructor(NetClientState *nc) 253 { 254 g_free(nc); 255 } 256 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 257 unsigned flags, 258 const struct iovec *iov, 259 int iovcnt, 260 void *opaque); 261 262 static void qemu_net_client_setup(NetClientState *nc, 263 NetClientInfo *info, 264 NetClientState *peer, 265 const char *model, 266 const char *name, 267 NetClientDestructor *destructor, 268 bool is_datapath) 269 { 270 nc->info = info; 271 nc->model = g_strdup(model); 272 if (name) { 273 nc->name = g_strdup(name); 274 } else { 275 nc->name = assign_name(nc, model); 276 } 277 278 if (peer) { 279 assert(!peer->peer); 280 nc->peer = peer; 281 peer->peer = nc; 282 } 283 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 284 285 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 286 nc->destructor = destructor; 287 nc->is_datapath = is_datapath; 288 QTAILQ_INIT(&nc->filters); 289 } 290 291 NetClientState *qemu_new_net_client(NetClientInfo *info, 292 NetClientState *peer, 293 const char *model, 294 const char *name) 295 { 296 NetClientState *nc; 297 298 assert(info->size >= sizeof(NetClientState)); 299 300 nc = g_malloc0(info->size); 301 qemu_net_client_setup(nc, info, peer, model, name, 302 qemu_net_client_destructor, true); 303 304 return nc; 305 } 306 307 NetClientState *qemu_new_net_control_client(NetClientInfo *info, 308 NetClientState *peer, 309 const char *model, 310 const char *name) 311 { 312 NetClientState *nc; 313 314 assert(info->size >= sizeof(NetClientState)); 315 316 nc = g_malloc0(info->size); 317 qemu_net_client_setup(nc, info, peer, model, name, 318 qemu_net_client_destructor, false); 319 320 return nc; 321 } 322 323 NICState *qemu_new_nic(NetClientInfo *info, 324 NICConf *conf, 325 const char *model, 326 const char *name, 327 MemReentrancyGuard *reentrancy_guard, 328 void *opaque) 329 { 330 NetClientState **peers = conf->peers.ncs; 331 NICState *nic; 332 int i, queues = MAX(1, conf->peers.queues); 333 334 assert(info->type == NET_CLIENT_DRIVER_NIC); 335 assert(info->size >= sizeof(NICState)); 336 337 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 338 nic->ncs = (void *)nic + info->size; 339 nic->conf = conf; 340 nic->reentrancy_guard = reentrancy_guard, 341 nic->opaque = opaque; 342 343 for (i = 0; i < queues; i++) { 344 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 345 NULL, true); 346 nic->ncs[i].queue_index = i; 347 } 348 349 return nic; 350 } 351 352 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 353 { 354 return nic->ncs + queue_index; 355 } 356 357 NetClientState *qemu_get_queue(NICState *nic) 358 { 359 return qemu_get_subqueue(nic, 0); 360 } 361 362 NICState *qemu_get_nic(NetClientState *nc) 363 { 364 NetClientState *nc0 = nc - nc->queue_index; 365 366 return (NICState *)((void *)nc0 - nc->info->size); 367 } 368 369 void *qemu_get_nic_opaque(NetClientState *nc) 370 { 371 NICState *nic = qemu_get_nic(nc); 372 373 return nic->opaque; 374 } 375 376 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 377 { 378 assert(nc != NULL); 379 NetClientState *ncs = nc + queue_index; 380 return ncs->peer; 381 } 382 383 static void qemu_cleanup_net_client(NetClientState *nc) 384 { 385 QTAILQ_REMOVE(&net_clients, nc, next); 386 387 if (nc->info->cleanup) { 388 nc->info->cleanup(nc); 389 } 390 } 391 392 static void qemu_free_net_client(NetClientState *nc) 393 { 394 if (nc->incoming_queue) { 395 qemu_del_net_queue(nc->incoming_queue); 396 } 397 if (nc->peer) { 398 nc->peer->peer = NULL; 399 } 400 g_free(nc->name); 401 g_free(nc->model); 402 if (nc->destructor) { 403 nc->destructor(nc); 404 } 405 } 406 407 void qemu_del_net_client(NetClientState *nc) 408 { 409 NetClientState *ncs[MAX_QUEUE_NUM]; 410 int queues, i; 411 NetFilterState *nf, *next; 412 413 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 414 415 /* If the NetClientState belongs to a multiqueue backend, we will change all 416 * other NetClientStates also. 417 */ 418 queues = qemu_find_net_clients_except(nc->name, ncs, 419 NET_CLIENT_DRIVER_NIC, 420 MAX_QUEUE_NUM); 421 assert(queues != 0); 422 423 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 424 object_unparent(OBJECT(nf)); 425 } 426 427 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 428 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 429 NICState *nic = qemu_get_nic(nc->peer); 430 if (nic->peer_deleted) { 431 return; 432 } 433 nic->peer_deleted = true; 434 435 for (i = 0; i < queues; i++) { 436 ncs[i]->peer->link_down = true; 437 } 438 439 if (nc->peer->info->link_status_changed) { 440 nc->peer->info->link_status_changed(nc->peer); 441 } 442 443 for (i = 0; i < queues; i++) { 444 qemu_cleanup_net_client(ncs[i]); 445 } 446 447 return; 448 } 449 450 for (i = 0; i < queues; i++) { 451 qemu_cleanup_net_client(ncs[i]); 452 qemu_free_net_client(ncs[i]); 453 } 454 } 455 456 void qemu_del_nic(NICState *nic) 457 { 458 int i, queues = MAX(nic->conf->peers.queues, 1); 459 460 qemu_macaddr_set_free(&nic->conf->macaddr); 461 462 for (i = 0; i < queues; i++) { 463 NetClientState *nc = qemu_get_subqueue(nic, i); 464 /* If this is a peer NIC and peer has already been deleted, free it now. */ 465 if (nic->peer_deleted) { 466 qemu_free_net_client(nc->peer); 467 } else if (nc->peer) { 468 /* if there are RX packets pending, complete them */ 469 qemu_purge_queued_packets(nc->peer); 470 } 471 } 472 473 for (i = queues - 1; i >= 0; i--) { 474 NetClientState *nc = qemu_get_subqueue(nic, i); 475 476 qemu_cleanup_net_client(nc); 477 qemu_free_net_client(nc); 478 } 479 480 g_free(nic); 481 } 482 483 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 484 { 485 NetClientState *nc; 486 487 QTAILQ_FOREACH(nc, &net_clients, next) { 488 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 489 if (nc->queue_index == 0) { 490 func(qemu_get_nic(nc), opaque); 491 } 492 } 493 } 494 } 495 496 bool qemu_has_ufo(NetClientState *nc) 497 { 498 if (!nc || !nc->info->has_ufo) { 499 return false; 500 } 501 502 return nc->info->has_ufo(nc); 503 } 504 505 bool qemu_has_uso(NetClientState *nc) 506 { 507 if (!nc || !nc->info->has_uso) { 508 return false; 509 } 510 511 return nc->info->has_uso(nc); 512 } 513 514 bool qemu_has_vnet_hdr(NetClientState *nc) 515 { 516 if (!nc || !nc->info->has_vnet_hdr) { 517 return false; 518 } 519 520 return nc->info->has_vnet_hdr(nc); 521 } 522 523 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 524 { 525 if (!nc || !nc->info->has_vnet_hdr_len) { 526 return false; 527 } 528 529 return nc->info->has_vnet_hdr_len(nc, len); 530 } 531 532 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 533 int ecn, int ufo, int uso4, int uso6) 534 { 535 if (!nc || !nc->info->set_offload) { 536 return; 537 } 538 539 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo, uso4, uso6); 540 } 541 542 int qemu_get_vnet_hdr_len(NetClientState *nc) 543 { 544 return nc->vnet_hdr_len; 545 } 546 547 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 548 { 549 if (!nc || !nc->info->set_vnet_hdr_len) { 550 return; 551 } 552 553 nc->vnet_hdr_len = len; 554 nc->info->set_vnet_hdr_len(nc, len); 555 } 556 557 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 558 { 559 #if HOST_BIG_ENDIAN 560 if (!nc || !nc->info->set_vnet_le) { 561 return -ENOSYS; 562 } 563 564 return nc->info->set_vnet_le(nc, is_le); 565 #else 566 return 0; 567 #endif 568 } 569 570 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 571 { 572 #if HOST_BIG_ENDIAN 573 return 0; 574 #else 575 if (!nc || !nc->info->set_vnet_be) { 576 return -ENOSYS; 577 } 578 579 return nc->info->set_vnet_be(nc, is_be); 580 #endif 581 } 582 583 int qemu_can_receive_packet(NetClientState *nc) 584 { 585 if (nc->receive_disabled) { 586 return 0; 587 } else if (nc->info->can_receive && 588 !nc->info->can_receive(nc)) { 589 return 0; 590 } 591 return 1; 592 } 593 594 int qemu_can_send_packet(NetClientState *sender) 595 { 596 int vm_running = runstate_is_running(); 597 598 if (!vm_running) { 599 return 0; 600 } 601 602 if (!sender->peer) { 603 return 1; 604 } 605 606 return qemu_can_receive_packet(sender->peer); 607 } 608 609 static ssize_t filter_receive_iov(NetClientState *nc, 610 NetFilterDirection direction, 611 NetClientState *sender, 612 unsigned flags, 613 const struct iovec *iov, 614 int iovcnt, 615 NetPacketSent *sent_cb) 616 { 617 ssize_t ret = 0; 618 NetFilterState *nf = NULL; 619 620 if (direction == NET_FILTER_DIRECTION_TX) { 621 QTAILQ_FOREACH(nf, &nc->filters, next) { 622 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 623 iovcnt, sent_cb); 624 if (ret) { 625 return ret; 626 } 627 } 628 } else { 629 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 630 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 631 iovcnt, sent_cb); 632 if (ret) { 633 return ret; 634 } 635 } 636 } 637 638 return ret; 639 } 640 641 static ssize_t filter_receive(NetClientState *nc, 642 NetFilterDirection direction, 643 NetClientState *sender, 644 unsigned flags, 645 const uint8_t *data, 646 size_t size, 647 NetPacketSent *sent_cb) 648 { 649 struct iovec iov = { 650 .iov_base = (void *)data, 651 .iov_len = size 652 }; 653 654 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 655 } 656 657 void qemu_purge_queued_packets(NetClientState *nc) 658 { 659 if (!nc->peer) { 660 return; 661 } 662 663 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 664 } 665 666 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 667 { 668 nc->receive_disabled = 0; 669 670 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 671 if (net_hub_flush(nc->peer)) { 672 qemu_notify_event(); 673 } 674 } 675 if (qemu_net_queue_flush(nc->incoming_queue)) { 676 /* We emptied the queue successfully, signal to the IO thread to repoll 677 * the file descriptor (for tap, for example). 678 */ 679 qemu_notify_event(); 680 } else if (purge) { 681 /* Unable to empty the queue, purge remaining packets */ 682 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 683 } 684 } 685 686 void qemu_flush_queued_packets(NetClientState *nc) 687 { 688 qemu_flush_or_purge_queued_packets(nc, false); 689 } 690 691 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 692 unsigned flags, 693 const uint8_t *buf, int size, 694 NetPacketSent *sent_cb) 695 { 696 NetQueue *queue; 697 int ret; 698 699 #ifdef DEBUG_NET 700 printf("qemu_send_packet_async:\n"); 701 qemu_hexdump(stdout, "net", buf, size); 702 #endif 703 704 if (sender->link_down || !sender->peer) { 705 return size; 706 } 707 708 /* Let filters handle the packet first */ 709 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 710 sender, flags, buf, size, sent_cb); 711 if (ret) { 712 return ret; 713 } 714 715 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 716 sender, flags, buf, size, sent_cb); 717 if (ret) { 718 return ret; 719 } 720 721 queue = sender->peer->incoming_queue; 722 723 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 724 } 725 726 ssize_t qemu_send_packet_async(NetClientState *sender, 727 const uint8_t *buf, int size, 728 NetPacketSent *sent_cb) 729 { 730 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 731 buf, size, sent_cb); 732 } 733 734 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 735 { 736 return qemu_send_packet_async(nc, buf, size, NULL); 737 } 738 739 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 740 { 741 if (!qemu_can_receive_packet(nc)) { 742 return 0; 743 } 744 745 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 746 } 747 748 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 749 int iovcnt) 750 { 751 if (!qemu_can_receive_packet(nc)) { 752 return 0; 753 } 754 755 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 756 } 757 758 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 759 { 760 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 761 buf, size, NULL); 762 } 763 764 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 765 int iovcnt, unsigned flags) 766 { 767 uint8_t *buf = NULL; 768 uint8_t *buffer; 769 size_t offset; 770 ssize_t ret; 771 772 if (iovcnt == 1) { 773 buffer = iov[0].iov_base; 774 offset = iov[0].iov_len; 775 } else { 776 offset = iov_size(iov, iovcnt); 777 if (offset > NET_BUFSIZE) { 778 return -1; 779 } 780 buf = g_malloc(offset); 781 buffer = buf; 782 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 783 } 784 785 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 786 ret = nc->info->receive_raw(nc, buffer, offset); 787 } else { 788 ret = nc->info->receive(nc, buffer, offset); 789 } 790 791 g_free(buf); 792 return ret; 793 } 794 795 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 796 unsigned flags, 797 const struct iovec *iov, 798 int iovcnt, 799 void *opaque) 800 { 801 MemReentrancyGuard *owned_reentrancy_guard; 802 NetClientState *nc = opaque; 803 int ret; 804 805 806 if (nc->link_down) { 807 return iov_size(iov, iovcnt); 808 } 809 810 if (nc->receive_disabled) { 811 return 0; 812 } 813 814 if (nc->info->type != NET_CLIENT_DRIVER_NIC || 815 qemu_get_nic(nc)->reentrancy_guard->engaged_in_io) { 816 owned_reentrancy_guard = NULL; 817 } else { 818 owned_reentrancy_guard = qemu_get_nic(nc)->reentrancy_guard; 819 owned_reentrancy_guard->engaged_in_io = true; 820 } 821 822 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 823 ret = nc->info->receive_iov(nc, iov, iovcnt); 824 } else { 825 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 826 } 827 828 if (owned_reentrancy_guard) { 829 owned_reentrancy_guard->engaged_in_io = false; 830 } 831 832 if (ret == 0) { 833 nc->receive_disabled = 1; 834 } 835 836 return ret; 837 } 838 839 ssize_t qemu_sendv_packet_async(NetClientState *sender, 840 const struct iovec *iov, int iovcnt, 841 NetPacketSent *sent_cb) 842 { 843 NetQueue *queue; 844 size_t size = iov_size(iov, iovcnt); 845 int ret; 846 847 if (size > NET_BUFSIZE) { 848 return size; 849 } 850 851 if (sender->link_down || !sender->peer) { 852 return size; 853 } 854 855 /* Let filters handle the packet first */ 856 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 857 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 858 if (ret) { 859 return ret; 860 } 861 862 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 863 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 864 if (ret) { 865 return ret; 866 } 867 868 queue = sender->peer->incoming_queue; 869 870 return qemu_net_queue_send_iov(queue, sender, 871 QEMU_NET_PACKET_FLAG_NONE, 872 iov, iovcnt, sent_cb); 873 } 874 875 ssize_t 876 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 877 { 878 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 879 } 880 881 NetClientState *qemu_find_netdev(const char *id) 882 { 883 NetClientState *nc; 884 885 QTAILQ_FOREACH(nc, &net_clients, next) { 886 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 887 continue; 888 if (!strcmp(nc->name, id)) { 889 return nc; 890 } 891 } 892 893 return NULL; 894 } 895 896 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 897 NetClientDriver type, int max) 898 { 899 NetClientState *nc; 900 int ret = 0; 901 902 QTAILQ_FOREACH(nc, &net_clients, next) { 903 if (nc->info->type == type) { 904 continue; 905 } 906 if (!id || !strcmp(nc->name, id)) { 907 if (ret < max) { 908 ncs[ret] = nc; 909 } 910 ret++; 911 } 912 } 913 914 return ret; 915 } 916 917 static int nic_get_free_idx(void) 918 { 919 int index; 920 921 for (index = 0; index < MAX_NICS; index++) 922 if (!nd_table[index].used) 923 return index; 924 return -1; 925 } 926 927 GPtrArray *qemu_get_nic_models(const char *device_type) 928 { 929 GPtrArray *nic_models = g_ptr_array_new(); 930 GSList *list = object_class_get_list_sorted(device_type, false); 931 932 while (list) { 933 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data, 934 TYPE_DEVICE); 935 GSList *next; 936 if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) && 937 dc->user_creatable) { 938 const char *name = object_class_get_name(list->data); 939 /* 940 * A network device might also be something else than a NIC, see 941 * e.g. the "rocker" device. Thus we have to look for the "netdev" 942 * property, too. Unfortunately, some devices like virtio-net only 943 * create this property during instance_init, so we have to create 944 * a temporary instance here to be able to check it. 945 */ 946 Object *obj = object_new_with_class(OBJECT_CLASS(dc)); 947 if (object_property_find(obj, "netdev")) { 948 g_ptr_array_add(nic_models, (gpointer)name); 949 } 950 object_unref(obj); 951 } 952 next = list->next; 953 g_slist_free_1(list); 954 list = next; 955 } 956 g_ptr_array_add(nic_models, NULL); 957 958 return nic_models; 959 } 960 961 static int net_init_nic(const Netdev *netdev, const char *name, 962 NetClientState *peer, Error **errp) 963 { 964 int idx; 965 NICInfo *nd; 966 const NetLegacyNicOptions *nic; 967 968 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 969 nic = &netdev->u.nic; 970 971 idx = nic_get_free_idx(); 972 if (idx == -1 || nb_nics >= MAX_NICS) { 973 error_setg(errp, "too many NICs"); 974 return -1; 975 } 976 977 nd = &nd_table[idx]; 978 979 memset(nd, 0, sizeof(*nd)); 980 981 if (nic->netdev) { 982 nd->netdev = qemu_find_netdev(nic->netdev); 983 if (!nd->netdev) { 984 error_setg(errp, "netdev '%s' not found", nic->netdev); 985 return -1; 986 } 987 } else { 988 assert(peer); 989 nd->netdev = peer; 990 } 991 nd->name = g_strdup(name); 992 if (nic->model) { 993 nd->model = g_strdup(nic->model); 994 } 995 if (nic->addr) { 996 nd->devaddr = g_strdup(nic->addr); 997 } 998 999 if (nic->macaddr && 1000 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 1001 error_setg(errp, "invalid syntax for ethernet address"); 1002 return -1; 1003 } 1004 if (nic->macaddr && 1005 is_multicast_ether_addr(nd->macaddr.a)) { 1006 error_setg(errp, 1007 "NIC cannot have multicast MAC address (odd 1st byte)"); 1008 return -1; 1009 } 1010 qemu_macaddr_default_if_unset(&nd->macaddr); 1011 1012 if (nic->has_vectors) { 1013 if (nic->vectors > 0x7ffffff) { 1014 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 1015 return -1; 1016 } 1017 nd->nvectors = nic->vectors; 1018 } else { 1019 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 1020 } 1021 1022 nd->used = 1; 1023 nb_nics++; 1024 1025 return idx; 1026 } 1027 1028 static gboolean add_nic_result(gpointer key, gpointer value, gpointer user_data) 1029 { 1030 GPtrArray *results = user_data; 1031 GPtrArray *alias_list = value; 1032 const char *model = key; 1033 char *result; 1034 1035 if (!alias_list) { 1036 result = g_strdup(model); 1037 } else { 1038 GString *result_str = g_string_new(model); 1039 int i; 1040 1041 g_string_append(result_str, " (aka "); 1042 for (i = 0; i < alias_list->len; i++) { 1043 if (i) { 1044 g_string_append(result_str, ", "); 1045 } 1046 g_string_append(result_str, alias_list->pdata[i]); 1047 } 1048 g_string_append(result_str, ")"); 1049 result = result_str->str; 1050 g_string_free(result_str, false); 1051 g_ptr_array_unref(alias_list); 1052 } 1053 g_ptr_array_add(results, result); 1054 return true; 1055 } 1056 1057 static int model_cmp(char **a, char **b) 1058 { 1059 return strcmp(*a, *b); 1060 } 1061 1062 static void show_nic_models(void) 1063 { 1064 GPtrArray *results = g_ptr_array_new(); 1065 int i; 1066 1067 g_hash_table_foreach_remove(nic_model_help, add_nic_result, results); 1068 g_ptr_array_sort(results, (GCompareFunc)model_cmp); 1069 1070 printf("Available NIC models for this configuration:\n"); 1071 for (i = 0 ; i < results->len; i++) { 1072 printf("%s\n", (char *)results->pdata[i]); 1073 } 1074 g_hash_table_unref(nic_model_help); 1075 nic_model_help = NULL; 1076 } 1077 1078 static void add_nic_model_help(const char *model, const char *alias) 1079 { 1080 GPtrArray *alias_list = NULL; 1081 1082 if (g_hash_table_lookup_extended(nic_model_help, model, NULL, 1083 (gpointer *)&alias_list)) { 1084 /* Already exists, no alias to add: return */ 1085 if (!alias) { 1086 return; 1087 } 1088 if (alias_list) { 1089 /* Check if this alias is already in the list. Add if not. */ 1090 if (!g_ptr_array_find_with_equal_func(alias_list, alias, 1091 g_str_equal, NULL)) { 1092 g_ptr_array_add(alias_list, g_strdup(alias)); 1093 } 1094 return; 1095 } 1096 } 1097 /* Either this model wasn't in the list already, or a first alias added */ 1098 if (alias) { 1099 alias_list = g_ptr_array_new(); 1100 g_ptr_array_set_free_func(alias_list, g_free); 1101 g_ptr_array_add(alias_list, g_strdup(alias)); 1102 } 1103 g_hash_table_replace(nic_model_help, g_strdup(model), alias_list); 1104 } 1105 1106 NICInfo *qemu_find_nic_info(const char *typename, bool match_default, 1107 const char *alias) 1108 { 1109 NICInfo *nd; 1110 int i; 1111 1112 if (nic_model_help) { 1113 add_nic_model_help(typename, alias); 1114 } 1115 1116 for (i = 0; i < nb_nics; i++) { 1117 nd = &nd_table[i]; 1118 1119 if (!nd->used || nd->instantiated) { 1120 continue; 1121 } 1122 1123 if ((match_default && !nd->model) || !g_strcmp0(nd->model, typename) 1124 || (alias && !g_strcmp0(nd->model, alias))) { 1125 return nd; 1126 } 1127 } 1128 return NULL; 1129 } 1130 1131 1132 /* "I have created a device. Please configure it if you can" */ 1133 bool qemu_configure_nic_device(DeviceState *dev, bool match_default, 1134 const char *alias) 1135 { 1136 NICInfo *nd = qemu_find_nic_info(object_get_typename(OBJECT(dev)), 1137 match_default, alias); 1138 1139 if (nd) { 1140 qdev_set_nic_properties(dev, nd); 1141 return true; 1142 } 1143 return false; 1144 } 1145 1146 /* "Please create a device, if you have a configuration for it" */ 1147 DeviceState *qemu_create_nic_device(const char *typename, bool match_default, 1148 const char *alias) 1149 { 1150 NICInfo *nd = qemu_find_nic_info(typename, match_default, alias); 1151 DeviceState *dev; 1152 1153 if (!nd) { 1154 return NULL; 1155 } 1156 1157 dev = qdev_new(typename); 1158 qdev_set_nic_properties(dev, nd); 1159 return dev; 1160 } 1161 1162 void qemu_create_nic_bus_devices(BusState *bus, const char *parent_type, 1163 const char *default_model, 1164 const char *alias, const char *alias_target) 1165 { 1166 GPtrArray *nic_models = qemu_get_nic_models(parent_type); 1167 const char *model; 1168 DeviceState *dev; 1169 NICInfo *nd; 1170 int i; 1171 1172 if (nic_model_help) { 1173 if (alias_target) { 1174 add_nic_model_help(alias_target, alias); 1175 } 1176 for (i = 0; i < nic_models->len - 1; i++) { 1177 add_nic_model_help(nic_models->pdata[i], NULL); 1178 } 1179 } 1180 1181 /* Drop the NULL terminator which would make g_str_equal() unhappy */ 1182 nic_models->len--; 1183 1184 for (i = 0; i < nb_nics; i++) { 1185 nd = &nd_table[i]; 1186 1187 if (!nd->used || nd->instantiated) { 1188 continue; 1189 } 1190 1191 model = nd->model ? nd->model : default_model; 1192 if (!model) { 1193 continue; 1194 } 1195 1196 /* Each bus type is allowed *one* substitution */ 1197 if (g_str_equal(model, alias)) { 1198 model = alias_target; 1199 } 1200 1201 if (!g_ptr_array_find_with_equal_func(nic_models, model, 1202 g_str_equal, NULL)) { 1203 /* This NIC does not live on this bus. */ 1204 continue; 1205 } 1206 1207 dev = qdev_new(model); 1208 qdev_set_nic_properties(dev, nd); 1209 qdev_realize_and_unref(dev, bus, &error_fatal); 1210 } 1211 1212 g_ptr_array_free(nic_models, true); 1213 } 1214 1215 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 1216 const Netdev *netdev, 1217 const char *name, 1218 NetClientState *peer, Error **errp) = { 1219 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 1220 #ifdef CONFIG_SLIRP 1221 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1222 #endif 1223 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1224 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1225 [NET_CLIENT_DRIVER_STREAM] = net_init_stream, 1226 [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, 1227 #ifdef CONFIG_VDE 1228 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1229 #endif 1230 #ifdef CONFIG_NETMAP 1231 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1232 #endif 1233 #ifdef CONFIG_AF_XDP 1234 [NET_CLIENT_DRIVER_AF_XDP] = net_init_af_xdp, 1235 #endif 1236 #ifdef CONFIG_NET_BRIDGE 1237 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1238 #endif 1239 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1240 #ifdef CONFIG_VHOST_NET_USER 1241 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1242 #endif 1243 #ifdef CONFIG_VHOST_NET_VDPA 1244 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1245 #endif 1246 #ifdef CONFIG_L2TPV3 1247 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1248 #endif 1249 #ifdef CONFIG_VMNET 1250 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1251 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1252 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1253 #endif /* CONFIG_VMNET */ 1254 }; 1255 1256 1257 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1258 { 1259 NetClientState *peer = NULL; 1260 NetClientState *nc; 1261 1262 if (is_netdev) { 1263 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1264 !net_client_init_fun[netdev->type]) { 1265 error_setg(errp, "network backend '%s' is not compiled into this binary", 1266 NetClientDriver_str(netdev->type)); 1267 return -1; 1268 } 1269 } else { 1270 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1271 return 0; /* nothing to do */ 1272 } 1273 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { 1274 error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", 1275 NetClientDriver_str(netdev->type)); 1276 return -1; 1277 } 1278 1279 if (!net_client_init_fun[netdev->type]) { 1280 error_setg(errp, "network backend '%s' is not compiled into this binary", 1281 NetClientDriver_str(netdev->type)); 1282 return -1; 1283 } 1284 1285 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1286 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1287 !netdev->u.nic.netdev) { 1288 peer = net_hub_add_port(0, NULL, NULL); 1289 } 1290 } 1291 1292 nc = qemu_find_netdev(netdev->id); 1293 if (nc) { 1294 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1295 return -1; 1296 } 1297 1298 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1299 /* FIXME drop when all init functions store an Error */ 1300 if (errp && !*errp) { 1301 error_setg(errp, "Device '%s' could not be initialized", 1302 NetClientDriver_str(netdev->type)); 1303 } 1304 return -1; 1305 } 1306 1307 if (is_netdev) { 1308 nc = qemu_find_netdev(netdev->id); 1309 assert(nc); 1310 nc->is_netdev = true; 1311 } 1312 1313 return 0; 1314 } 1315 1316 void show_netdevs(void) 1317 { 1318 int idx; 1319 const char *available_netdevs[] = { 1320 "socket", 1321 "stream", 1322 "dgram", 1323 "hubport", 1324 "tap", 1325 #ifdef CONFIG_SLIRP 1326 "user", 1327 #endif 1328 #ifdef CONFIG_L2TPV3 1329 "l2tpv3", 1330 #endif 1331 #ifdef CONFIG_VDE 1332 "vde", 1333 #endif 1334 #ifdef CONFIG_NET_BRIDGE 1335 "bridge", 1336 #endif 1337 #ifdef CONFIG_NETMAP 1338 "netmap", 1339 #endif 1340 #ifdef CONFIG_AF_XDP 1341 "af-xdp", 1342 #endif 1343 #ifdef CONFIG_POSIX 1344 "vhost-user", 1345 #endif 1346 #ifdef CONFIG_VHOST_VDPA 1347 "vhost-vdpa", 1348 #endif 1349 #ifdef CONFIG_VMNET 1350 "vmnet-host", 1351 "vmnet-shared", 1352 "vmnet-bridged", 1353 #endif 1354 }; 1355 1356 qemu_printf("Available netdev backend types:\n"); 1357 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1358 qemu_printf("%s\n", available_netdevs[idx]); 1359 } 1360 } 1361 1362 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1363 { 1364 gchar **substrings = NULL; 1365 Netdev *object = NULL; 1366 int ret = -1; 1367 Visitor *v = opts_visitor_new(opts); 1368 1369 /* Parse convenience option format ipv6-net=fec0::0[/64] */ 1370 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1371 1372 if (ip6_net) { 1373 char *prefix_addr; 1374 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1375 1376 substrings = g_strsplit(ip6_net, "/", 2); 1377 if (!substrings || !substrings[0]) { 1378 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1379 "a valid IPv6 prefix"); 1380 goto out; 1381 } 1382 1383 prefix_addr = substrings[0]; 1384 1385 /* Handle user-specified prefix length. */ 1386 if (substrings[1] && 1387 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1388 { 1389 error_setg(errp, 1390 "parameter 'ipv6-net' expects a number after '/'"); 1391 goto out; 1392 } 1393 1394 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1395 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1396 &error_abort); 1397 qemu_opt_unset(opts, "ipv6-net"); 1398 } 1399 1400 /* Create an ID for -net if the user did not specify one */ 1401 if (!is_netdev && !qemu_opts_id(opts)) { 1402 qemu_opts_set_id(opts, id_generate(ID_NET)); 1403 } 1404 1405 if (visit_type_Netdev(v, NULL, &object, errp)) { 1406 ret = net_client_init1(object, is_netdev, errp); 1407 } 1408 1409 qapi_free_Netdev(object); 1410 1411 out: 1412 g_strfreev(substrings); 1413 visit_free(v); 1414 return ret; 1415 } 1416 1417 void netdev_add(QemuOpts *opts, Error **errp) 1418 { 1419 net_client_init(opts, true, errp); 1420 } 1421 1422 void qmp_netdev_add(Netdev *netdev, Error **errp) 1423 { 1424 if (!id_wellformed(netdev->id)) { 1425 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1426 return; 1427 } 1428 1429 net_client_init1(netdev, true, errp); 1430 } 1431 1432 void qmp_netdev_del(const char *id, Error **errp) 1433 { 1434 NetClientState *nc; 1435 QemuOpts *opts; 1436 1437 nc = qemu_find_netdev(id); 1438 if (!nc) { 1439 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1440 "Device '%s' not found", id); 1441 return; 1442 } 1443 1444 if (!nc->is_netdev) { 1445 error_setg(errp, "Device '%s' is not a netdev", id); 1446 return; 1447 } 1448 1449 qemu_del_net_client(nc); 1450 1451 /* 1452 * Wart: we need to delete the QemuOpts associated with netdevs 1453 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1454 * HMP netdev_add. 1455 */ 1456 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1457 if (opts) { 1458 qemu_opts_del(opts); 1459 } 1460 } 1461 1462 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1463 { 1464 char *str; 1465 ObjectProperty *prop; 1466 ObjectPropertyIterator iter; 1467 Visitor *v; 1468 1469 /* generate info str */ 1470 object_property_iter_init(&iter, OBJECT(nf)); 1471 while ((prop = object_property_iter_next(&iter))) { 1472 if (!strcmp(prop->name, "type")) { 1473 continue; 1474 } 1475 v = string_output_visitor_new(false, &str); 1476 object_property_get(OBJECT(nf), prop->name, v, NULL); 1477 visit_complete(v, &str); 1478 visit_free(v); 1479 monitor_printf(mon, ",%s=%s", prop->name, str); 1480 g_free(str); 1481 } 1482 monitor_printf(mon, "\n"); 1483 } 1484 1485 void print_net_client(Monitor *mon, NetClientState *nc) 1486 { 1487 NetFilterState *nf; 1488 1489 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1490 nc->queue_index, 1491 NetClientDriver_str(nc->info->type), 1492 nc->info_str); 1493 if (!QTAILQ_EMPTY(&nc->filters)) { 1494 monitor_printf(mon, "filters:\n"); 1495 } 1496 QTAILQ_FOREACH(nf, &nc->filters, next) { 1497 monitor_printf(mon, " - %s: type=%s", 1498 object_get_canonical_path_component(OBJECT(nf)), 1499 object_get_typename(OBJECT(nf))); 1500 netfilter_print_info(mon, nf); 1501 } 1502 } 1503 1504 RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp) 1505 { 1506 NetClientState *nc; 1507 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1508 1509 QTAILQ_FOREACH(nc, &net_clients, next) { 1510 RxFilterInfo *info; 1511 1512 if (name && strcmp(nc->name, name) != 0) { 1513 continue; 1514 } 1515 1516 /* only query rx-filter information of NIC */ 1517 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1518 if (name) { 1519 error_setg(errp, "net client(%s) isn't a NIC", name); 1520 assert(!filter_list); 1521 return NULL; 1522 } 1523 continue; 1524 } 1525 1526 /* only query information on queue 0 since the info is per nic, 1527 * not per queue 1528 */ 1529 if (nc->queue_index != 0) 1530 continue; 1531 1532 if (nc->info->query_rx_filter) { 1533 info = nc->info->query_rx_filter(nc); 1534 QAPI_LIST_APPEND(tail, info); 1535 } else if (name) { 1536 error_setg(errp, "net client(%s) doesn't support" 1537 " rx-filter querying", name); 1538 assert(!filter_list); 1539 return NULL; 1540 } 1541 1542 if (name) { 1543 break; 1544 } 1545 } 1546 1547 if (filter_list == NULL && name) { 1548 error_setg(errp, "invalid net client name: %s", name); 1549 } 1550 1551 return filter_list; 1552 } 1553 1554 void colo_notify_filters_event(int event, Error **errp) 1555 { 1556 NetClientState *nc; 1557 NetFilterState *nf; 1558 NetFilterClass *nfc = NULL; 1559 Error *local_err = NULL; 1560 1561 QTAILQ_FOREACH(nc, &net_clients, next) { 1562 QTAILQ_FOREACH(nf, &nc->filters, next) { 1563 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1564 nfc->handle_event(nf, event, &local_err); 1565 if (local_err) { 1566 error_propagate(errp, local_err); 1567 return; 1568 } 1569 } 1570 } 1571 } 1572 1573 void qmp_set_link(const char *name, bool up, Error **errp) 1574 { 1575 NetClientState *ncs[MAX_QUEUE_NUM]; 1576 NetClientState *nc; 1577 int queues, i; 1578 1579 queues = qemu_find_net_clients_except(name, ncs, 1580 NET_CLIENT_DRIVER__MAX, 1581 MAX_QUEUE_NUM); 1582 1583 if (queues == 0) { 1584 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1585 "Device '%s' not found", name); 1586 return; 1587 } 1588 nc = ncs[0]; 1589 1590 for (i = 0; i < queues; i++) { 1591 ncs[i]->link_down = !up; 1592 } 1593 1594 if (nc->info->link_status_changed) { 1595 nc->info->link_status_changed(nc); 1596 } 1597 1598 if (nc->peer) { 1599 /* Change peer link only if the peer is NIC and then notify peer. 1600 * If the peer is a HUBPORT or a backend, we do not change the 1601 * link status. 1602 * 1603 * This behavior is compatible with qemu hubs where there could be 1604 * multiple clients that can still communicate with each other in 1605 * disconnected mode. For now maintain this compatibility. 1606 */ 1607 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1608 for (i = 0; i < queues; i++) { 1609 ncs[i]->peer->link_down = !up; 1610 } 1611 } 1612 if (nc->peer->info->link_status_changed) { 1613 nc->peer->info->link_status_changed(nc->peer); 1614 } 1615 } 1616 } 1617 1618 static void net_vm_change_state_handler(void *opaque, bool running, 1619 RunState state) 1620 { 1621 NetClientState *nc; 1622 NetClientState *tmp; 1623 1624 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1625 if (running) { 1626 /* Flush queued packets and wake up backends. */ 1627 if (nc->peer && qemu_can_send_packet(nc)) { 1628 qemu_flush_queued_packets(nc->peer); 1629 } 1630 } else { 1631 /* Complete all queued packets, to guarantee we don't modify 1632 * state later when VM is not running. 1633 */ 1634 qemu_flush_or_purge_queued_packets(nc, true); 1635 } 1636 } 1637 } 1638 1639 void net_cleanup(void) 1640 { 1641 NetClientState *nc, **p = &QTAILQ_FIRST(&net_clients); 1642 1643 /*cleanup colo compare module for COLO*/ 1644 colo_compare_cleanup(); 1645 1646 /* 1647 * Walk the net_clients list and remove the netdevs but *not* any 1648 * NET_CLIENT_DRIVER_NIC entries. The latter are owned by the device 1649 * model which created them, and in some cases (e.g. xen-net-device) 1650 * the device itself may do cleanup at exit and will be upset if we 1651 * just delete its NIC from underneath it. 1652 * 1653 * Since qemu_del_net_client() may delete multiple entries, using 1654 * QTAILQ_FOREACH_SAFE() is not safe here. The only safe pointer 1655 * to keep as a bookmark is a NET_CLIENT_DRIVER_NIC entry, so keep 1656 * 'p' pointing to either the head of the list, or the 'next' field 1657 * of the latest NET_CLIENT_DRIVER_NIC, and operate on *p as we walk 1658 * the list. 1659 * 1660 * The 'nc' variable isn't part of the list traversal; it's purely 1661 * for convenience as too much '(*p)->' has a tendency to make the 1662 * readers' eyes bleed. 1663 */ 1664 while (*p) { 1665 nc = *p; 1666 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1667 /* Skip NET_CLIENT_DRIVER_NIC entries */ 1668 p = &QTAILQ_NEXT(nc, next); 1669 } else { 1670 qemu_del_net_client(nc); 1671 } 1672 } 1673 1674 qemu_del_vm_change_state_handler(net_change_state_entry); 1675 } 1676 1677 void net_check_clients(void) 1678 { 1679 NetClientState *nc; 1680 int i; 1681 1682 if (nic_model_help) { 1683 show_nic_models(); 1684 exit(0); 1685 } 1686 net_hub_check_clients(); 1687 1688 QTAILQ_FOREACH(nc, &net_clients, next) { 1689 if (!nc->peer) { 1690 warn_report("%s %s has no peer", 1691 nc->info->type == NET_CLIENT_DRIVER_NIC 1692 ? "nic" : "netdev", 1693 nc->name); 1694 } 1695 } 1696 1697 /* Check that all NICs requested via -net nic actually got created. 1698 * NICs created via -device don't need to be checked here because 1699 * they are always instantiated. 1700 */ 1701 for (i = 0; i < MAX_NICS; i++) { 1702 NICInfo *nd = &nd_table[i]; 1703 if (nd->used && !nd->instantiated) { 1704 warn_report("requested NIC (%s, model %s) " 1705 "was not created (not supported by this machine?)", 1706 nd->name ? nd->name : "anonymous", 1707 nd->model ? nd->model : "unspecified"); 1708 } 1709 } 1710 } 1711 1712 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1713 { 1714 return net_client_init(opts, false, errp); 1715 } 1716 1717 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1718 { 1719 const char *type = qemu_opt_get(opts, "type"); 1720 1721 if (type && is_help_option(type)) { 1722 show_netdevs(); 1723 exit(0); 1724 } 1725 return net_client_init(opts, true, errp); 1726 } 1727 1728 /* For the convenience "--nic" parameter */ 1729 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1730 { 1731 char *mac, *nd_id; 1732 int idx, ret; 1733 NICInfo *ni; 1734 const char *type; 1735 1736 type = qemu_opt_get(opts, "type"); 1737 if (type) { 1738 if (g_str_equal(type, "none")) { 1739 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1740 } 1741 if (is_help_option(type)) { 1742 GPtrArray *nic_models = qemu_get_nic_models(TYPE_DEVICE); 1743 int i; 1744 show_netdevs(); 1745 printf("\n"); 1746 printf("Available NIC models " 1747 "(use -nic model=help for a filtered list):\n"); 1748 for (i = 0 ; nic_models->pdata[i]; i++) { 1749 printf("%s\n", (char *)nic_models->pdata[i]); 1750 } 1751 g_ptr_array_free(nic_models, true); 1752 exit(0); 1753 } 1754 } 1755 1756 idx = nic_get_free_idx(); 1757 if (idx == -1 || nb_nics >= MAX_NICS) { 1758 error_setg(errp, "no more on-board/default NIC slots available"); 1759 return -1; 1760 } 1761 1762 if (!type) { 1763 qemu_opt_set(opts, "type", "user", &error_abort); 1764 } 1765 1766 ni = &nd_table[idx]; 1767 memset(ni, 0, sizeof(*ni)); 1768 ni->model = qemu_opt_get_del(opts, "model"); 1769 1770 if (!nic_model_help && !g_strcmp0(ni->model, "help")) { 1771 nic_model_help = g_hash_table_new_full(g_str_hash, g_str_equal, 1772 g_free, NULL); 1773 return 0; 1774 } 1775 1776 /* Create an ID if the user did not specify one */ 1777 nd_id = g_strdup(qemu_opts_id(opts)); 1778 if (!nd_id) { 1779 nd_id = id_generate(ID_NET); 1780 qemu_opts_set_id(opts, nd_id); 1781 } 1782 1783 /* Handle MAC address */ 1784 mac = qemu_opt_get_del(opts, "mac"); 1785 if (mac) { 1786 ret = net_parse_macaddr(ni->macaddr.a, mac); 1787 g_free(mac); 1788 if (ret) { 1789 error_setg(errp, "invalid syntax for ethernet address"); 1790 goto out; 1791 } 1792 if (is_multicast_ether_addr(ni->macaddr.a)) { 1793 error_setg(errp, "NIC cannot have multicast MAC address"); 1794 ret = -1; 1795 goto out; 1796 } 1797 } 1798 qemu_macaddr_default_if_unset(&ni->macaddr); 1799 1800 ret = net_client_init(opts, true, errp); 1801 if (ret == 0) { 1802 ni->netdev = qemu_find_netdev(nd_id); 1803 ni->used = true; 1804 nb_nics++; 1805 } 1806 1807 out: 1808 g_free(nd_id); 1809 return ret; 1810 } 1811 1812 static void netdev_init_modern(void) 1813 { 1814 while (!QSIMPLEQ_EMPTY(&nd_queue)) { 1815 NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); 1816 1817 QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); 1818 loc_push_restore(&nd->loc); 1819 net_client_init1(nd->nd, true, &error_fatal); 1820 loc_pop(&nd->loc); 1821 qapi_free_Netdev(nd->nd); 1822 g_free(nd); 1823 } 1824 } 1825 1826 void net_init_clients(void) 1827 { 1828 net_change_state_entry = 1829 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1830 1831 QTAILQ_INIT(&net_clients); 1832 1833 netdev_init_modern(); 1834 1835 qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1836 &error_fatal); 1837 1838 qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, 1839 &error_fatal); 1840 1841 qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, 1842 &error_fatal); 1843 } 1844 1845 /* 1846 * Does this -netdev argument use modern rather than traditional syntax? 1847 * Modern syntax is to be parsed with netdev_parse_modern(). 1848 * Traditional syntax is to be parsed with net_client_parse(). 1849 */ 1850 bool netdev_is_modern(const char *optstr) 1851 { 1852 QemuOpts *opts; 1853 bool is_modern; 1854 const char *type; 1855 static QemuOptsList dummy_opts = { 1856 .name = "netdev", 1857 .implied_opt_name = "type", 1858 .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), 1859 .desc = { { } }, 1860 }; 1861 1862 if (optstr[0] == '{') { 1863 /* This is JSON, which means it's modern syntax */ 1864 return true; 1865 } 1866 1867 opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); 1868 qemu_opts_do_parse(opts, optstr, dummy_opts.implied_opt_name, 1869 &error_abort); 1870 type = qemu_opt_get(opts, "type"); 1871 is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); 1872 1873 qemu_opts_reset(&dummy_opts); 1874 1875 return is_modern; 1876 } 1877 1878 /* 1879 * netdev_parse_modern() uses modern, more expressive syntax than 1880 * net_client_parse(), but supports only the -netdev option. 1881 * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() 1882 * appends to @qemu_netdev_opts. 1883 */ 1884 void netdev_parse_modern(const char *optstr) 1885 { 1886 Visitor *v; 1887 NetdevQueueEntry *nd; 1888 1889 v = qobject_input_visitor_new_str(optstr, "type", &error_fatal); 1890 nd = g_new(NetdevQueueEntry, 1); 1891 visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); 1892 visit_free(v); 1893 loc_save(&nd->loc); 1894 1895 QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); 1896 } 1897 1898 void net_client_parse(QemuOptsList *opts_list, const char *optstr) 1899 { 1900 if (!qemu_opts_parse_noisily(opts_list, optstr, true)) { 1901 exit(1); 1902 } 1903 } 1904 1905 /* From FreeBSD */ 1906 /* XXX: optimize */ 1907 uint32_t net_crc32(const uint8_t *p, int len) 1908 { 1909 uint32_t crc; 1910 int carry, i, j; 1911 uint8_t b; 1912 1913 crc = 0xffffffff; 1914 for (i = 0; i < len; i++) { 1915 b = *p++; 1916 for (j = 0; j < 8; j++) { 1917 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1918 crc <<= 1; 1919 b >>= 1; 1920 if (carry) { 1921 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1922 } 1923 } 1924 } 1925 1926 return crc; 1927 } 1928 1929 uint32_t net_crc32_le(const uint8_t *p, int len) 1930 { 1931 uint32_t crc; 1932 int carry, i, j; 1933 uint8_t b; 1934 1935 crc = 0xffffffff; 1936 for (i = 0; i < len; i++) { 1937 b = *p++; 1938 for (j = 0; j < 8; j++) { 1939 carry = (crc & 0x1) ^ (b & 0x01); 1940 crc >>= 1; 1941 b >>= 1; 1942 if (carry) { 1943 crc ^= POLYNOMIAL_LE; 1944 } 1945 } 1946 } 1947 1948 return crc; 1949 } 1950 1951 QemuOptsList qemu_netdev_opts = { 1952 .name = "netdev", 1953 .implied_opt_name = "type", 1954 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1955 .desc = { 1956 /* 1957 * no elements => accept any params 1958 * validation will happen later 1959 */ 1960 { /* end of list */ } 1961 }, 1962 }; 1963 1964 QemuOptsList qemu_nic_opts = { 1965 .name = "nic", 1966 .implied_opt_name = "type", 1967 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1968 .desc = { 1969 /* 1970 * no elements => accept any params 1971 * validation will happen later 1972 */ 1973 { /* end of list */ } 1974 }, 1975 }; 1976 1977 QemuOptsList qemu_net_opts = { 1978 .name = "net", 1979 .implied_opt_name = "type", 1980 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1981 .desc = { 1982 /* 1983 * no elements => accept any params 1984 * validation will happen later 1985 */ 1986 { /* end of list */ } 1987 }, 1988 }; 1989 1990 void net_socket_rs_init(SocketReadState *rs, 1991 SocketReadStateFinalize *finalize, 1992 bool vnet_hdr) 1993 { 1994 rs->state = 0; 1995 rs->vnet_hdr = vnet_hdr; 1996 rs->index = 0; 1997 rs->packet_len = 0; 1998 rs->vnet_hdr_len = 0; 1999 memset(rs->buf, 0, sizeof(rs->buf)); 2000 rs->finalize = finalize; 2001 } 2002 2003 /* 2004 * Returns 2005 * 0: success 2006 * -1: error occurs 2007 */ 2008 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 2009 { 2010 unsigned int l; 2011 2012 while (size > 0) { 2013 /* Reassemble a packet from the network. 2014 * 0 = getting length. 2015 * 1 = getting vnet header length. 2016 * 2 = getting data. 2017 */ 2018 switch (rs->state) { 2019 case 0: 2020 l = 4 - rs->index; 2021 if (l > size) { 2022 l = size; 2023 } 2024 memcpy(rs->buf + rs->index, buf, l); 2025 buf += l; 2026 size -= l; 2027 rs->index += l; 2028 if (rs->index == 4) { 2029 /* got length */ 2030 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 2031 rs->index = 0; 2032 if (rs->vnet_hdr) { 2033 rs->state = 1; 2034 } else { 2035 rs->state = 2; 2036 rs->vnet_hdr_len = 0; 2037 } 2038 } 2039 break; 2040 case 1: 2041 l = 4 - rs->index; 2042 if (l > size) { 2043 l = size; 2044 } 2045 memcpy(rs->buf + rs->index, buf, l); 2046 buf += l; 2047 size -= l; 2048 rs->index += l; 2049 if (rs->index == 4) { 2050 /* got vnet header length */ 2051 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 2052 rs->index = 0; 2053 rs->state = 2; 2054 } 2055 break; 2056 case 2: 2057 l = rs->packet_len - rs->index; 2058 if (l > size) { 2059 l = size; 2060 } 2061 if (rs->index + l <= sizeof(rs->buf)) { 2062 memcpy(rs->buf + rs->index, buf, l); 2063 } else { 2064 fprintf(stderr, "serious error: oversized packet received," 2065 "connection terminated.\n"); 2066 rs->index = rs->state = 0; 2067 return -1; 2068 } 2069 2070 rs->index += l; 2071 buf += l; 2072 size -= l; 2073 if (rs->index >= rs->packet_len) { 2074 rs->index = 0; 2075 rs->state = 0; 2076 assert(rs->finalize); 2077 rs->finalize(rs); 2078 } 2079 break; 2080 } 2081 } 2082 2083 assert(size == 0); 2084 return 0; 2085 } 2086