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