1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 27 #include "net/net.h" 28 #include "clients.h" 29 #include "hub.h" 30 #include "hw/qdev-properties.h" 31 #include "net/slirp.h" 32 #include "net/eth.h" 33 #include "util.h" 34 35 #include "monitor/monitor.h" 36 #include "qemu/help_option.h" 37 #include "qapi/qapi-commands-net.h" 38 #include "qapi/qapi-visit-net.h" 39 #include "qapi/qmp/qdict.h" 40 #include "qapi/qmp/qerror.h" 41 #include "qemu/error-report.h" 42 #include "qemu/sockets.h" 43 #include "qemu/cutils.h" 44 #include "qemu/config-file.h" 45 #include "qemu/ctype.h" 46 #include "qemu/id.h" 47 #include "qemu/iov.h" 48 #include "qemu/qemu-print.h" 49 #include "qemu/main-loop.h" 50 #include "qemu/option.h" 51 #include "qemu/keyval.h" 52 #include "qapi/error.h" 53 #include "qapi/opts-visitor.h" 54 #include "sysemu/runstate.h" 55 #include "net/colo-compare.h" 56 #include "net/filter.h" 57 #include "qapi/string-output-visitor.h" 58 #include "qapi/qobject-input-visitor.h" 59 #include "standard-headers/linux/virtio_net.h" 60 61 /* Net bridge is currently not supported for W32. */ 62 #if !defined(_WIN32) 63 # define CONFIG_NET_BRIDGE 64 #endif 65 66 static VMChangeStateEntry *net_change_state_entry; 67 NetClientStateList net_clients; 68 69 typedef struct NetdevQueueEntry { 70 Netdev *nd; 71 Location loc; 72 QSIMPLEQ_ENTRY(NetdevQueueEntry) entry; 73 } NetdevQueueEntry; 74 75 typedef QSIMPLEQ_HEAD(, NetdevQueueEntry) NetdevQueue; 76 77 static NetdevQueue nd_queue = QSIMPLEQ_HEAD_INITIALIZER(nd_queue); 78 79 static GHashTable *nic_model_help; 80 81 static int nb_nics; 82 static NICInfo nd_table[MAX_NICS]; 83 84 /***********************************************************/ 85 /* network device redirectors */ 86 87 int convert_host_port(struct sockaddr_in *saddr, const char *host, 88 const char *port, Error **errp) 89 { 90 struct hostent *he; 91 const char *r; 92 long p; 93 94 memset(saddr, 0, sizeof(*saddr)); 95 96 saddr->sin_family = AF_INET; 97 if (host[0] == '\0') { 98 saddr->sin_addr.s_addr = 0; 99 } else { 100 if (qemu_isdigit(host[0])) { 101 if (!inet_aton(host, &saddr->sin_addr)) { 102 error_setg(errp, "host address '%s' is not a valid " 103 "IPv4 address", host); 104 return -1; 105 } 106 } else { 107 he = gethostbyname(host); 108 if (he == NULL) { 109 error_setg(errp, "can't resolve host address '%s'", host); 110 return -1; 111 } 112 saddr->sin_addr = *(struct in_addr *)he->h_addr; 113 } 114 } 115 if (qemu_strtol(port, &r, 0, &p) != 0) { 116 error_setg(errp, "port number '%s' is invalid", port); 117 return -1; 118 } 119 saddr->sin_port = htons(p); 120 return 0; 121 } 122 123 int parse_host_port(struct sockaddr_in *saddr, const char *str, 124 Error **errp) 125 { 126 gchar **substrings; 127 int ret; 128 129 substrings = g_strsplit(str, ":", 2); 130 if (!substrings || !substrings[0] || !substrings[1]) { 131 error_setg(errp, "host address '%s' doesn't contain ':' " 132 "separating host from port", str); 133 ret = -1; 134 goto out; 135 } 136 137 ret = convert_host_port(saddr, substrings[0], substrings[1], errp); 138 139 out: 140 g_strfreev(substrings); 141 return ret; 142 } 143 144 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 145 { 146 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 147 macaddr[0], macaddr[1], macaddr[2], 148 macaddr[3], macaddr[4], macaddr[5]); 149 } 150 151 void qemu_set_info_str(NetClientState *nc, const char *fmt, ...) 152 { 153 va_list ap; 154 155 va_start(ap, fmt); 156 vsnprintf(nc->info_str, sizeof(nc->info_str), fmt, ap); 157 va_end(ap); 158 } 159 160 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 161 { 162 qemu_set_info_str(nc, "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 163 nc->model, macaddr[0], macaddr[1], macaddr[2], 164 macaddr[3], macaddr[4], macaddr[5]); 165 } 166 167 static int mac_table[256] = {0}; 168 169 static void qemu_macaddr_set_used(MACAddr *macaddr) 170 { 171 int index; 172 173 for (index = 0x56; index < 0xFF; index++) { 174 if (macaddr->a[5] == index) { 175 mac_table[index]++; 176 } 177 } 178 } 179 180 static void qemu_macaddr_set_free(MACAddr *macaddr) 181 { 182 int index; 183 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 184 185 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 186 return; 187 } 188 for (index = 0x56; index < 0xFF; index++) { 189 if (macaddr->a[5] == index) { 190 mac_table[index]--; 191 } 192 } 193 } 194 195 static int qemu_macaddr_get_free(void) 196 { 197 int index; 198 199 for (index = 0x56; index < 0xFF; index++) { 200 if (mac_table[index] == 0) { 201 return index; 202 } 203 } 204 205 return -1; 206 } 207 208 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 209 { 210 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 211 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 212 213 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 214 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 215 return; 216 } else { 217 qemu_macaddr_set_used(macaddr); 218 return; 219 } 220 } 221 222 macaddr->a[0] = 0x52; 223 macaddr->a[1] = 0x54; 224 macaddr->a[2] = 0x00; 225 macaddr->a[3] = 0x12; 226 macaddr->a[4] = 0x34; 227 macaddr->a[5] = qemu_macaddr_get_free(); 228 qemu_macaddr_set_used(macaddr); 229 } 230 231 /** 232 * Generate a name for net client 233 * 234 * Only net clients created with the legacy -net option and NICs need this. 235 */ 236 static char *assign_name(NetClientState *nc1, const char *model) 237 { 238 NetClientState *nc; 239 int id = 0; 240 241 QTAILQ_FOREACH(nc, &net_clients, next) { 242 if (nc == nc1) { 243 continue; 244 } 245 if (strcmp(nc->model, model) == 0) { 246 id++; 247 } 248 } 249 250 return g_strdup_printf("%s.%d", model, id); 251 } 252 253 static void qemu_net_client_destructor(NetClientState *nc) 254 { 255 g_free(nc); 256 } 257 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 258 unsigned flags, 259 const struct iovec *iov, 260 int iovcnt, 261 void *opaque); 262 263 static void qemu_net_client_setup(NetClientState *nc, 264 NetClientInfo *info, 265 NetClientState *peer, 266 const char *model, 267 const char *name, 268 NetClientDestructor *destructor, 269 bool is_datapath) 270 { 271 nc->info = info; 272 nc->model = g_strdup(model); 273 if (name) { 274 nc->name = g_strdup(name); 275 } else { 276 nc->name = assign_name(nc, model); 277 } 278 279 if (peer) { 280 assert(!peer->peer); 281 nc->peer = peer; 282 peer->peer = nc; 283 } 284 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 285 286 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 287 nc->destructor = destructor; 288 nc->is_datapath = is_datapath; 289 QTAILQ_INIT(&nc->filters); 290 } 291 292 NetClientState *qemu_new_net_client(NetClientInfo *info, 293 NetClientState *peer, 294 const char *model, 295 const char *name) 296 { 297 NetClientState *nc; 298 299 assert(info->size >= sizeof(NetClientState)); 300 301 nc = g_malloc0(info->size); 302 qemu_net_client_setup(nc, info, peer, model, name, 303 qemu_net_client_destructor, true); 304 305 return nc; 306 } 307 308 NetClientState *qemu_new_net_control_client(NetClientInfo *info, 309 NetClientState *peer, 310 const char *model, 311 const char *name) 312 { 313 NetClientState *nc; 314 315 assert(info->size >= sizeof(NetClientState)); 316 317 nc = g_malloc0(info->size); 318 qemu_net_client_setup(nc, info, peer, model, name, 319 qemu_net_client_destructor, false); 320 321 return nc; 322 } 323 324 NICState *qemu_new_nic(NetClientInfo *info, 325 NICConf *conf, 326 const char *model, 327 const char *name, 328 MemReentrancyGuard *reentrancy_guard, 329 void *opaque) 330 { 331 NetClientState **peers = conf->peers.ncs; 332 NICState *nic; 333 int i, queues = MAX(1, conf->peers.queues); 334 335 assert(info->type == NET_CLIENT_DRIVER_NIC); 336 assert(info->size >= sizeof(NICState)); 337 338 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 339 nic->ncs = (void *)nic + info->size; 340 nic->conf = conf; 341 nic->reentrancy_guard = reentrancy_guard, 342 nic->opaque = opaque; 343 344 for (i = 0; i < queues; i++) { 345 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 346 NULL, true); 347 nic->ncs[i].queue_index = i; 348 } 349 350 return nic; 351 } 352 353 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 354 { 355 return nic->ncs + queue_index; 356 } 357 358 NetClientState *qemu_get_queue(NICState *nic) 359 { 360 return qemu_get_subqueue(nic, 0); 361 } 362 363 NICState *qemu_get_nic(NetClientState *nc) 364 { 365 NetClientState *nc0 = nc - nc->queue_index; 366 367 return (NICState *)((void *)nc0 - nc->info->size); 368 } 369 370 void *qemu_get_nic_opaque(NetClientState *nc) 371 { 372 NICState *nic = qemu_get_nic(nc); 373 374 return nic->opaque; 375 } 376 377 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 378 { 379 assert(nc != NULL); 380 NetClientState *ncs = nc + queue_index; 381 return ncs->peer; 382 } 383 384 static void qemu_cleanup_net_client(NetClientState *nc) 385 { 386 QTAILQ_REMOVE(&net_clients, nc, next); 387 388 if (nc->info->cleanup) { 389 nc->info->cleanup(nc); 390 } 391 } 392 393 static void qemu_free_net_client(NetClientState *nc) 394 { 395 if (nc->incoming_queue) { 396 qemu_del_net_queue(nc->incoming_queue); 397 } 398 if (nc->peer) { 399 nc->peer->peer = NULL; 400 } 401 g_free(nc->name); 402 g_free(nc->model); 403 if (nc->destructor) { 404 nc->destructor(nc); 405 } 406 } 407 408 void qemu_del_net_client(NetClientState *nc) 409 { 410 NetClientState *ncs[MAX_QUEUE_NUM]; 411 int queues, i; 412 NetFilterState *nf, *next; 413 414 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 415 416 /* If the NetClientState belongs to a multiqueue backend, we will change all 417 * other NetClientStates also. 418 */ 419 queues = qemu_find_net_clients_except(nc->name, ncs, 420 NET_CLIENT_DRIVER_NIC, 421 MAX_QUEUE_NUM); 422 assert(queues != 0); 423 424 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 425 object_unparent(OBJECT(nf)); 426 } 427 428 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 429 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 430 NICState *nic = qemu_get_nic(nc->peer); 431 if (nic->peer_deleted) { 432 return; 433 } 434 nic->peer_deleted = true; 435 436 for (i = 0; i < queues; i++) { 437 ncs[i]->peer->link_down = true; 438 } 439 440 if (nc->peer->info->link_status_changed) { 441 nc->peer->info->link_status_changed(nc->peer); 442 } 443 444 for (i = 0; i < queues; i++) { 445 qemu_cleanup_net_client(ncs[i]); 446 } 447 448 return; 449 } 450 451 for (i = 0; i < queues; i++) { 452 qemu_cleanup_net_client(ncs[i]); 453 qemu_free_net_client(ncs[i]); 454 } 455 } 456 457 void qemu_del_nic(NICState *nic) 458 { 459 int i, queues = MAX(nic->conf->peers.queues, 1); 460 461 qemu_macaddr_set_free(&nic->conf->macaddr); 462 463 for (i = 0; i < queues; i++) { 464 NetClientState *nc = qemu_get_subqueue(nic, i); 465 /* If this is a peer NIC and peer has already been deleted, free it now. */ 466 if (nic->peer_deleted) { 467 qemu_free_net_client(nc->peer); 468 } else if (nc->peer) { 469 /* if there are RX packets pending, complete them */ 470 qemu_purge_queued_packets(nc->peer); 471 } 472 } 473 474 for (i = queues - 1; i >= 0; i--) { 475 NetClientState *nc = qemu_get_subqueue(nic, i); 476 477 qemu_cleanup_net_client(nc); 478 qemu_free_net_client(nc); 479 } 480 481 g_free(nic); 482 } 483 484 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 485 { 486 NetClientState *nc; 487 488 QTAILQ_FOREACH(nc, &net_clients, next) { 489 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 490 if (nc->queue_index == 0) { 491 func(qemu_get_nic(nc), opaque); 492 } 493 } 494 } 495 } 496 497 bool qemu_has_ufo(NetClientState *nc) 498 { 499 if (!nc || !nc->info->has_ufo) { 500 return false; 501 } 502 503 return nc->info->has_ufo(nc); 504 } 505 506 bool qemu_has_uso(NetClientState *nc) 507 { 508 if (!nc || !nc->info->has_uso) { 509 return false; 510 } 511 512 return nc->info->has_uso(nc); 513 } 514 515 bool qemu_has_vnet_hdr(NetClientState *nc) 516 { 517 if (!nc || !nc->info->has_vnet_hdr) { 518 return false; 519 } 520 521 return nc->info->has_vnet_hdr(nc); 522 } 523 524 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 525 { 526 if (!nc || !nc->info->has_vnet_hdr_len) { 527 return false; 528 } 529 530 return nc->info->has_vnet_hdr_len(nc, len); 531 } 532 533 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 534 int ecn, int ufo, int uso4, int uso6) 535 { 536 if (!nc || !nc->info->set_offload) { 537 return; 538 } 539 540 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo, uso4, uso6); 541 } 542 543 int qemu_get_vnet_hdr_len(NetClientState *nc) 544 { 545 return nc->vnet_hdr_len; 546 } 547 548 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 549 { 550 if (!nc || !nc->info->set_vnet_hdr_len) { 551 return; 552 } 553 554 assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) || 555 len == sizeof(struct virtio_net_hdr) || 556 len == sizeof(struct virtio_net_hdr_v1_hash)); 557 558 nc->vnet_hdr_len = len; 559 nc->info->set_vnet_hdr_len(nc, len); 560 } 561 562 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 563 { 564 #if HOST_BIG_ENDIAN 565 if (!nc || !nc->info->set_vnet_le) { 566 return -ENOSYS; 567 } 568 569 return nc->info->set_vnet_le(nc, is_le); 570 #else 571 return 0; 572 #endif 573 } 574 575 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 576 { 577 #if HOST_BIG_ENDIAN 578 return 0; 579 #else 580 if (!nc || !nc->info->set_vnet_be) { 581 return -ENOSYS; 582 } 583 584 return nc->info->set_vnet_be(nc, is_be); 585 #endif 586 } 587 588 int qemu_can_receive_packet(NetClientState *nc) 589 { 590 if (nc->receive_disabled) { 591 return 0; 592 } else if (nc->info->can_receive && 593 !nc->info->can_receive(nc)) { 594 return 0; 595 } 596 return 1; 597 } 598 599 int qemu_can_send_packet(NetClientState *sender) 600 { 601 int vm_running = runstate_is_running(); 602 603 if (!vm_running) { 604 return 0; 605 } 606 607 if (!sender->peer) { 608 return 1; 609 } 610 611 return qemu_can_receive_packet(sender->peer); 612 } 613 614 static ssize_t filter_receive_iov(NetClientState *nc, 615 NetFilterDirection direction, 616 NetClientState *sender, 617 unsigned flags, 618 const struct iovec *iov, 619 int iovcnt, 620 NetPacketSent *sent_cb) 621 { 622 ssize_t ret = 0; 623 NetFilterState *nf = NULL; 624 625 if (direction == NET_FILTER_DIRECTION_TX) { 626 QTAILQ_FOREACH(nf, &nc->filters, next) { 627 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 628 iovcnt, sent_cb); 629 if (ret) { 630 return ret; 631 } 632 } 633 } else { 634 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 635 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 636 iovcnt, sent_cb); 637 if (ret) { 638 return ret; 639 } 640 } 641 } 642 643 return ret; 644 } 645 646 static ssize_t filter_receive(NetClientState *nc, 647 NetFilterDirection direction, 648 NetClientState *sender, 649 unsigned flags, 650 const uint8_t *data, 651 size_t size, 652 NetPacketSent *sent_cb) 653 { 654 struct iovec iov = { 655 .iov_base = (void *)data, 656 .iov_len = size 657 }; 658 659 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 660 } 661 662 void qemu_purge_queued_packets(NetClientState *nc) 663 { 664 if (!nc->peer) { 665 return; 666 } 667 668 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 669 } 670 671 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 672 { 673 nc->receive_disabled = 0; 674 675 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 676 if (net_hub_flush(nc->peer)) { 677 qemu_notify_event(); 678 } 679 } 680 if (qemu_net_queue_flush(nc->incoming_queue)) { 681 /* We emptied the queue successfully, signal to the IO thread to repoll 682 * the file descriptor (for tap, for example). 683 */ 684 qemu_notify_event(); 685 } else if (purge) { 686 /* Unable to empty the queue, purge remaining packets */ 687 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 688 } 689 } 690 691 void qemu_flush_queued_packets(NetClientState *nc) 692 { 693 qemu_flush_or_purge_queued_packets(nc, false); 694 } 695 696 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 697 unsigned flags, 698 const uint8_t *buf, int size, 699 NetPacketSent *sent_cb) 700 { 701 NetQueue *queue; 702 int ret; 703 704 #ifdef DEBUG_NET 705 printf("qemu_send_packet_async:\n"); 706 qemu_hexdump(stdout, "net", buf, size); 707 #endif 708 709 if (sender->link_down || !sender->peer) { 710 return size; 711 } 712 713 /* Let filters handle the packet first */ 714 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 715 sender, flags, buf, size, sent_cb); 716 if (ret) { 717 return ret; 718 } 719 720 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 721 sender, flags, buf, size, sent_cb); 722 if (ret) { 723 return ret; 724 } 725 726 queue = sender->peer->incoming_queue; 727 728 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 729 } 730 731 ssize_t qemu_send_packet_async(NetClientState *sender, 732 const uint8_t *buf, int size, 733 NetPacketSent *sent_cb) 734 { 735 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 736 buf, size, sent_cb); 737 } 738 739 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 740 { 741 return qemu_send_packet_async(nc, buf, size, NULL); 742 } 743 744 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 745 { 746 if (!qemu_can_receive_packet(nc)) { 747 return 0; 748 } 749 750 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 751 } 752 753 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 754 { 755 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 756 buf, size, NULL); 757 } 758 759 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 760 int iovcnt, unsigned flags) 761 { 762 uint8_t *buf = NULL; 763 uint8_t *buffer; 764 size_t offset; 765 ssize_t ret; 766 767 if (iovcnt == 1) { 768 buffer = iov[0].iov_base; 769 offset = iov[0].iov_len; 770 } else { 771 offset = iov_size(iov, iovcnt); 772 if (offset > NET_BUFSIZE) { 773 return -1; 774 } 775 buf = g_malloc(offset); 776 buffer = buf; 777 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 778 } 779 780 ret = nc->info->receive(nc, buffer, offset); 781 782 g_free(buf); 783 return ret; 784 } 785 786 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 787 unsigned flags, 788 const struct iovec *iov, 789 int iovcnt, 790 void *opaque) 791 { 792 MemReentrancyGuard *owned_reentrancy_guard; 793 NetClientState *nc = opaque; 794 int ret; 795 struct virtio_net_hdr_v1_hash vnet_hdr = { }; 796 g_autofree struct iovec *iov_copy = NULL; 797 798 799 if (nc->link_down) { 800 return iov_size(iov, iovcnt); 801 } 802 803 if (nc->receive_disabled) { 804 return 0; 805 } 806 807 if (nc->info->type != NET_CLIENT_DRIVER_NIC || 808 qemu_get_nic(nc)->reentrancy_guard->engaged_in_io) { 809 owned_reentrancy_guard = NULL; 810 } else { 811 owned_reentrancy_guard = qemu_get_nic(nc)->reentrancy_guard; 812 owned_reentrancy_guard->engaged_in_io = true; 813 } 814 815 if ((flags & QEMU_NET_PACKET_FLAG_RAW) && nc->vnet_hdr_len) { 816 iov_copy = g_new(struct iovec, iovcnt + 1); 817 iov_copy[0].iov_base = &vnet_hdr; 818 iov_copy[0].iov_len = nc->vnet_hdr_len; 819 memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); 820 iov = iov_copy; 821 } 822 823 if (nc->info->receive_iov) { 824 ret = nc->info->receive_iov(nc, iov, iovcnt); 825 } else { 826 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 827 } 828 829 if (owned_reentrancy_guard) { 830 owned_reentrancy_guard->engaged_in_io = false; 831 } 832 833 if (ret == 0) { 834 nc->receive_disabled = 1; 835 } 836 837 return ret; 838 } 839 840 ssize_t qemu_sendv_packet_async(NetClientState *sender, 841 const struct iovec *iov, int iovcnt, 842 NetPacketSent *sent_cb) 843 { 844 NetQueue *queue; 845 size_t size = iov_size(iov, iovcnt); 846 int ret; 847 848 if (size > NET_BUFSIZE) { 849 return size; 850 } 851 852 if (sender->link_down || !sender->peer) { 853 return size; 854 } 855 856 /* Let filters handle the packet first */ 857 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 858 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 859 if (ret) { 860 return ret; 861 } 862 863 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 864 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 865 if (ret) { 866 return ret; 867 } 868 869 queue = sender->peer->incoming_queue; 870 871 return qemu_net_queue_send_iov(queue, sender, 872 QEMU_NET_PACKET_FLAG_NONE, 873 iov, iovcnt, sent_cb); 874 } 875 876 ssize_t 877 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 878 { 879 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 880 } 881 882 NetClientState *qemu_find_netdev(const char *id) 883 { 884 NetClientState *nc; 885 886 QTAILQ_FOREACH(nc, &net_clients, next) { 887 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 888 continue; 889 if (!strcmp(nc->name, id)) { 890 return nc; 891 } 892 } 893 894 return NULL; 895 } 896 897 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 898 NetClientDriver type, int max) 899 { 900 NetClientState *nc; 901 int ret = 0; 902 903 QTAILQ_FOREACH(nc, &net_clients, next) { 904 if (nc->info->type == type) { 905 continue; 906 } 907 if (!id || !strcmp(nc->name, id)) { 908 if (ret < max) { 909 ncs[ret] = nc; 910 } 911 ret++; 912 } 913 } 914 915 return ret; 916 } 917 918 static int nic_get_free_idx(void) 919 { 920 int index; 921 922 for (index = 0; index < MAX_NICS; index++) 923 if (!nd_table[index].used) 924 return index; 925 return -1; 926 } 927 928 GPtrArray *qemu_get_nic_models(const char *device_type) 929 { 930 GPtrArray *nic_models = g_ptr_array_new(); 931 GSList *list = object_class_get_list_sorted(device_type, false); 932 933 while (list) { 934 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data, 935 TYPE_DEVICE); 936 GSList *next; 937 if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) && 938 dc->user_creatable) { 939 const char *name = object_class_get_name(list->data); 940 /* 941 * A network device might also be something else than a NIC, see 942 * e.g. the "rocker" device. Thus we have to look for the "netdev" 943 * property, too. Unfortunately, some devices like virtio-net only 944 * create this property during instance_init, so we have to create 945 * a temporary instance here to be able to check it. 946 */ 947 Object *obj = object_new_with_class(OBJECT_CLASS(dc)); 948 if (object_property_find(obj, "netdev")) { 949 g_ptr_array_add(nic_models, (gpointer)name); 950 } 951 object_unref(obj); 952 } 953 next = list->next; 954 g_slist_free_1(list); 955 list = next; 956 } 957 g_ptr_array_add(nic_models, NULL); 958 959 return nic_models; 960 } 961 962 static int net_init_nic(const Netdev *netdev, const char *name, 963 NetClientState *peer, Error **errp) 964 { 965 int idx; 966 NICInfo *nd; 967 const NetLegacyNicOptions *nic; 968 969 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 970 nic = &netdev->u.nic; 971 972 idx = nic_get_free_idx(); 973 if (idx == -1 || nb_nics >= MAX_NICS) { 974 error_setg(errp, "too many NICs"); 975 return -1; 976 } 977 978 nd = &nd_table[idx]; 979 980 memset(nd, 0, sizeof(*nd)); 981 982 if (nic->netdev) { 983 nd->netdev = qemu_find_netdev(nic->netdev); 984 if (!nd->netdev) { 985 error_setg(errp, "netdev '%s' not found", nic->netdev); 986 return -1; 987 } 988 } else { 989 assert(peer); 990 nd->netdev = peer; 991 } 992 nd->name = g_strdup(name); 993 if (nic->model) { 994 nd->model = g_strdup(nic->model); 995 } 996 if (nic->addr) { 997 nd->devaddr = g_strdup(nic->addr); 998 } 999 1000 if (nic->macaddr && 1001 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 1002 error_setg(errp, "invalid syntax for ethernet address"); 1003 return -1; 1004 } 1005 if (nic->macaddr && 1006 is_multicast_ether_addr(nd->macaddr.a)) { 1007 error_setg(errp, 1008 "NIC cannot have multicast MAC address (odd 1st byte)"); 1009 return -1; 1010 } 1011 qemu_macaddr_default_if_unset(&nd->macaddr); 1012 1013 if (nic->has_vectors) { 1014 if (nic->vectors > 0x7ffffff) { 1015 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 1016 return -1; 1017 } 1018 nd->nvectors = nic->vectors; 1019 } else { 1020 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 1021 } 1022 1023 nd->used = 1; 1024 nb_nics++; 1025 1026 return idx; 1027 } 1028 1029 static gboolean add_nic_result(gpointer key, gpointer value, gpointer user_data) 1030 { 1031 GPtrArray *results = user_data; 1032 GPtrArray *alias_list = value; 1033 const char *model = key; 1034 char *result; 1035 1036 if (!alias_list) { 1037 result = g_strdup(model); 1038 } else { 1039 GString *result_str = g_string_new(model); 1040 int i; 1041 1042 g_string_append(result_str, " (aka "); 1043 for (i = 0; i < alias_list->len; i++) { 1044 if (i) { 1045 g_string_append(result_str, ", "); 1046 } 1047 g_string_append(result_str, alias_list->pdata[i]); 1048 } 1049 g_string_append(result_str, ")"); 1050 result = result_str->str; 1051 g_string_free(result_str, false); 1052 g_ptr_array_unref(alias_list); 1053 } 1054 g_ptr_array_add(results, result); 1055 return true; 1056 } 1057 1058 static int model_cmp(char **a, char **b) 1059 { 1060 return strcmp(*a, *b); 1061 } 1062 1063 static void show_nic_models(void) 1064 { 1065 GPtrArray *results = g_ptr_array_new(); 1066 int i; 1067 1068 g_hash_table_foreach_remove(nic_model_help, add_nic_result, results); 1069 g_ptr_array_sort(results, (GCompareFunc)model_cmp); 1070 1071 printf("Available NIC models for this configuration:\n"); 1072 for (i = 0 ; i < results->len; i++) { 1073 printf("%s\n", (char *)results->pdata[i]); 1074 } 1075 g_hash_table_unref(nic_model_help); 1076 nic_model_help = NULL; 1077 } 1078 1079 static void add_nic_model_help(const char *model, const char *alias) 1080 { 1081 GPtrArray *alias_list = NULL; 1082 1083 if (g_hash_table_lookup_extended(nic_model_help, model, NULL, 1084 (gpointer *)&alias_list)) { 1085 /* Already exists, no alias to add: return */ 1086 if (!alias) { 1087 return; 1088 } 1089 if (alias_list) { 1090 /* Check if this alias is already in the list. Add if not. */ 1091 if (!g_ptr_array_find_with_equal_func(alias_list, alias, 1092 g_str_equal, NULL)) { 1093 g_ptr_array_add(alias_list, g_strdup(alias)); 1094 } 1095 return; 1096 } 1097 } 1098 /* Either this model wasn't in the list already, or a first alias added */ 1099 if (alias) { 1100 alias_list = g_ptr_array_new(); 1101 g_ptr_array_set_free_func(alias_list, g_free); 1102 g_ptr_array_add(alias_list, g_strdup(alias)); 1103 } 1104 g_hash_table_replace(nic_model_help, g_strdup(model), alias_list); 1105 } 1106 1107 NICInfo *qemu_find_nic_info(const char *typename, bool match_default, 1108 const char *alias) 1109 { 1110 NICInfo *nd; 1111 int i; 1112 1113 if (nic_model_help) { 1114 add_nic_model_help(typename, alias); 1115 } 1116 1117 for (i = 0; i < nb_nics; i++) { 1118 nd = &nd_table[i]; 1119 1120 if (!nd->used || nd->instantiated) { 1121 continue; 1122 } 1123 1124 if ((match_default && !nd->model) || !g_strcmp0(nd->model, typename) 1125 || (alias && !g_strcmp0(nd->model, alias))) { 1126 return nd; 1127 } 1128 } 1129 return NULL; 1130 } 1131 1132 static bool is_nic_model_help_option(const char *model) 1133 { 1134 if (model && is_help_option(model)) { 1135 /* 1136 * Trigger the help output by instantiating the hash table which 1137 * will gather tha available models as they get registered. 1138 */ 1139 if (!nic_model_help) { 1140 nic_model_help = g_hash_table_new_full(g_str_hash, g_str_equal, 1141 g_free, NULL); 1142 } 1143 return true; 1144 } 1145 return false; 1146 } 1147 1148 /* "I have created a device. Please configure it if you can" */ 1149 bool qemu_configure_nic_device(DeviceState *dev, bool match_default, 1150 const char *alias) 1151 { 1152 NICInfo *nd = qemu_find_nic_info(object_get_typename(OBJECT(dev)), 1153 match_default, alias); 1154 1155 if (nd) { 1156 qdev_set_nic_properties(dev, nd); 1157 return true; 1158 } 1159 return false; 1160 } 1161 1162 /* "Please create a device, if you have a configuration for it" */ 1163 DeviceState *qemu_create_nic_device(const char *typename, bool match_default, 1164 const char *alias) 1165 { 1166 NICInfo *nd = qemu_find_nic_info(typename, match_default, alias); 1167 DeviceState *dev; 1168 1169 if (!nd) { 1170 return NULL; 1171 } 1172 1173 dev = qdev_new(typename); 1174 qdev_set_nic_properties(dev, nd); 1175 return dev; 1176 } 1177 1178 void qemu_create_nic_bus_devices(BusState *bus, const char *parent_type, 1179 const char *default_model, 1180 const char *alias, const char *alias_target) 1181 { 1182 GPtrArray *nic_models = qemu_get_nic_models(parent_type); 1183 const char *model; 1184 DeviceState *dev; 1185 NICInfo *nd; 1186 int i; 1187 1188 if (nic_model_help) { 1189 if (alias_target) { 1190 add_nic_model_help(alias_target, alias); 1191 } 1192 for (i = 0; i < nic_models->len - 1; i++) { 1193 add_nic_model_help(nic_models->pdata[i], NULL); 1194 } 1195 } 1196 1197 /* Drop the NULL terminator which would make g_str_equal() unhappy */ 1198 nic_models->len--; 1199 1200 for (i = 0; i < nb_nics; i++) { 1201 nd = &nd_table[i]; 1202 1203 if (!nd->used || nd->instantiated) { 1204 continue; 1205 } 1206 1207 model = nd->model ? nd->model : default_model; 1208 if (!model) { 1209 continue; 1210 } 1211 1212 /* Each bus type is allowed *one* substitution */ 1213 if (g_str_equal(model, alias)) { 1214 model = alias_target; 1215 } 1216 1217 if (!g_ptr_array_find_with_equal_func(nic_models, model, 1218 g_str_equal, NULL)) { 1219 /* This NIC does not live on this bus. */ 1220 continue; 1221 } 1222 1223 dev = qdev_new(model); 1224 qdev_set_nic_properties(dev, nd); 1225 qdev_realize_and_unref(dev, bus, &error_fatal); 1226 } 1227 1228 g_ptr_array_free(nic_models, true); 1229 } 1230 1231 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 1232 const Netdev *netdev, 1233 const char *name, 1234 NetClientState *peer, Error **errp) = { 1235 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 1236 #ifdef CONFIG_SLIRP 1237 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1238 #endif 1239 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1240 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1241 [NET_CLIENT_DRIVER_STREAM] = net_init_stream, 1242 [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, 1243 #ifdef CONFIG_VDE 1244 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1245 #endif 1246 #ifdef CONFIG_NETMAP 1247 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1248 #endif 1249 #ifdef CONFIG_AF_XDP 1250 [NET_CLIENT_DRIVER_AF_XDP] = net_init_af_xdp, 1251 #endif 1252 #ifdef CONFIG_NET_BRIDGE 1253 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1254 #endif 1255 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1256 #ifdef CONFIG_VHOST_NET_USER 1257 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1258 #endif 1259 #ifdef CONFIG_VHOST_NET_VDPA 1260 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1261 #endif 1262 #ifdef CONFIG_L2TPV3 1263 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1264 #endif 1265 #ifdef CONFIG_VMNET 1266 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1267 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1268 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1269 #endif /* CONFIG_VMNET */ 1270 }; 1271 1272 1273 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1274 { 1275 NetClientState *peer = NULL; 1276 NetClientState *nc; 1277 1278 if (is_netdev) { 1279 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1280 !net_client_init_fun[netdev->type]) { 1281 error_setg(errp, "network backend '%s' is not compiled into this binary", 1282 NetClientDriver_str(netdev->type)); 1283 return -1; 1284 } 1285 } else { 1286 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1287 return 0; /* nothing to do */ 1288 } 1289 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { 1290 error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", 1291 NetClientDriver_str(netdev->type)); 1292 return -1; 1293 } 1294 1295 if (!net_client_init_fun[netdev->type]) { 1296 error_setg(errp, "network backend '%s' is not compiled into this binary", 1297 NetClientDriver_str(netdev->type)); 1298 return -1; 1299 } 1300 1301 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1302 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1303 !netdev->u.nic.netdev) { 1304 peer = net_hub_add_port(0, NULL, NULL); 1305 } 1306 } 1307 1308 nc = qemu_find_netdev(netdev->id); 1309 if (nc) { 1310 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1311 return -1; 1312 } 1313 1314 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1315 /* FIXME drop when all init functions store an Error */ 1316 if (errp && !*errp) { 1317 error_setg(errp, "Device '%s' could not be initialized", 1318 NetClientDriver_str(netdev->type)); 1319 } 1320 return -1; 1321 } 1322 1323 if (is_netdev) { 1324 nc = qemu_find_netdev(netdev->id); 1325 assert(nc); 1326 nc->is_netdev = true; 1327 } 1328 1329 return 0; 1330 } 1331 1332 void show_netdevs(void) 1333 { 1334 int idx; 1335 const char *available_netdevs[] = { 1336 "socket", 1337 "stream", 1338 "dgram", 1339 "hubport", 1340 "tap", 1341 #ifdef CONFIG_SLIRP 1342 "user", 1343 #endif 1344 #ifdef CONFIG_L2TPV3 1345 "l2tpv3", 1346 #endif 1347 #ifdef CONFIG_VDE 1348 "vde", 1349 #endif 1350 #ifdef CONFIG_NET_BRIDGE 1351 "bridge", 1352 #endif 1353 #ifdef CONFIG_NETMAP 1354 "netmap", 1355 #endif 1356 #ifdef CONFIG_AF_XDP 1357 "af-xdp", 1358 #endif 1359 #ifdef CONFIG_POSIX 1360 "vhost-user", 1361 #endif 1362 #ifdef CONFIG_VHOST_VDPA 1363 "vhost-vdpa", 1364 #endif 1365 #ifdef CONFIG_VMNET 1366 "vmnet-host", 1367 "vmnet-shared", 1368 "vmnet-bridged", 1369 #endif 1370 }; 1371 1372 qemu_printf("Available netdev backend types:\n"); 1373 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1374 qemu_printf("%s\n", available_netdevs[idx]); 1375 } 1376 } 1377 1378 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1379 { 1380 gchar **substrings = NULL; 1381 Netdev *object = NULL; 1382 int ret = -1; 1383 Visitor *v = opts_visitor_new(opts); 1384 1385 /* Parse convenience option format ipv6-net=fec0::0[/64] */ 1386 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1387 1388 if (ip6_net) { 1389 char *prefix_addr; 1390 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1391 1392 substrings = g_strsplit(ip6_net, "/", 2); 1393 if (!substrings || !substrings[0]) { 1394 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1395 "a valid IPv6 prefix"); 1396 goto out; 1397 } 1398 1399 prefix_addr = substrings[0]; 1400 1401 /* Handle user-specified prefix length. */ 1402 if (substrings[1] && 1403 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1404 { 1405 error_setg(errp, 1406 "parameter 'ipv6-net' expects a number after '/'"); 1407 goto out; 1408 } 1409 1410 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1411 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1412 &error_abort); 1413 qemu_opt_unset(opts, "ipv6-net"); 1414 } 1415 1416 /* Create an ID for -net if the user did not specify one */ 1417 if (!is_netdev && !qemu_opts_id(opts)) { 1418 qemu_opts_set_id(opts, id_generate(ID_NET)); 1419 } 1420 1421 if (visit_type_Netdev(v, NULL, &object, errp)) { 1422 ret = net_client_init1(object, is_netdev, errp); 1423 } 1424 1425 qapi_free_Netdev(object); 1426 1427 out: 1428 g_strfreev(substrings); 1429 visit_free(v); 1430 return ret; 1431 } 1432 1433 void netdev_add(QemuOpts *opts, Error **errp) 1434 { 1435 net_client_init(opts, true, errp); 1436 } 1437 1438 void qmp_netdev_add(Netdev *netdev, Error **errp) 1439 { 1440 if (!id_wellformed(netdev->id)) { 1441 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1442 return; 1443 } 1444 1445 net_client_init1(netdev, true, errp); 1446 } 1447 1448 void qmp_netdev_del(const char *id, Error **errp) 1449 { 1450 NetClientState *nc; 1451 QemuOpts *opts; 1452 1453 nc = qemu_find_netdev(id); 1454 if (!nc) { 1455 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1456 "Device '%s' not found", id); 1457 return; 1458 } 1459 1460 if (!nc->is_netdev) { 1461 error_setg(errp, "Device '%s' is not a netdev", id); 1462 return; 1463 } 1464 1465 qemu_del_net_client(nc); 1466 1467 /* 1468 * Wart: we need to delete the QemuOpts associated with netdevs 1469 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1470 * HMP netdev_add. 1471 */ 1472 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1473 if (opts) { 1474 qemu_opts_del(opts); 1475 } 1476 } 1477 1478 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1479 { 1480 char *str; 1481 ObjectProperty *prop; 1482 ObjectPropertyIterator iter; 1483 Visitor *v; 1484 1485 /* generate info str */ 1486 object_property_iter_init(&iter, OBJECT(nf)); 1487 while ((prop = object_property_iter_next(&iter))) { 1488 if (!strcmp(prop->name, "type")) { 1489 continue; 1490 } 1491 v = string_output_visitor_new(false, &str); 1492 object_property_get(OBJECT(nf), prop->name, v, NULL); 1493 visit_complete(v, &str); 1494 visit_free(v); 1495 monitor_printf(mon, ",%s=%s", prop->name, str); 1496 g_free(str); 1497 } 1498 monitor_printf(mon, "\n"); 1499 } 1500 1501 void print_net_client(Monitor *mon, NetClientState *nc) 1502 { 1503 NetFilterState *nf; 1504 1505 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1506 nc->queue_index, 1507 NetClientDriver_str(nc->info->type), 1508 nc->info_str); 1509 if (!QTAILQ_EMPTY(&nc->filters)) { 1510 monitor_printf(mon, "filters:\n"); 1511 } 1512 QTAILQ_FOREACH(nf, &nc->filters, next) { 1513 monitor_printf(mon, " - %s: type=%s", 1514 object_get_canonical_path_component(OBJECT(nf)), 1515 object_get_typename(OBJECT(nf))); 1516 netfilter_print_info(mon, nf); 1517 } 1518 } 1519 1520 RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp) 1521 { 1522 NetClientState *nc; 1523 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1524 1525 QTAILQ_FOREACH(nc, &net_clients, next) { 1526 RxFilterInfo *info; 1527 1528 if (name && strcmp(nc->name, name) != 0) { 1529 continue; 1530 } 1531 1532 /* only query rx-filter information of NIC */ 1533 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1534 if (name) { 1535 error_setg(errp, "net client(%s) isn't a NIC", name); 1536 assert(!filter_list); 1537 return NULL; 1538 } 1539 continue; 1540 } 1541 1542 /* only query information on queue 0 since the info is per nic, 1543 * not per queue 1544 */ 1545 if (nc->queue_index != 0) 1546 continue; 1547 1548 if (nc->info->query_rx_filter) { 1549 info = nc->info->query_rx_filter(nc); 1550 QAPI_LIST_APPEND(tail, info); 1551 } else if (name) { 1552 error_setg(errp, "net client(%s) doesn't support" 1553 " rx-filter querying", name); 1554 assert(!filter_list); 1555 return NULL; 1556 } 1557 1558 if (name) { 1559 break; 1560 } 1561 } 1562 1563 if (filter_list == NULL && name) { 1564 error_setg(errp, "invalid net client name: %s", name); 1565 } 1566 1567 return filter_list; 1568 } 1569 1570 void colo_notify_filters_event(int event, Error **errp) 1571 { 1572 NetClientState *nc; 1573 NetFilterState *nf; 1574 NetFilterClass *nfc = NULL; 1575 Error *local_err = NULL; 1576 1577 QTAILQ_FOREACH(nc, &net_clients, next) { 1578 QTAILQ_FOREACH(nf, &nc->filters, next) { 1579 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1580 nfc->handle_event(nf, event, &local_err); 1581 if (local_err) { 1582 error_propagate(errp, local_err); 1583 return; 1584 } 1585 } 1586 } 1587 } 1588 1589 void qmp_set_link(const char *name, bool up, Error **errp) 1590 { 1591 NetClientState *ncs[MAX_QUEUE_NUM]; 1592 NetClientState *nc; 1593 int queues, i; 1594 1595 queues = qemu_find_net_clients_except(name, ncs, 1596 NET_CLIENT_DRIVER__MAX, 1597 MAX_QUEUE_NUM); 1598 1599 if (queues == 0) { 1600 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1601 "Device '%s' not found", name); 1602 return; 1603 } 1604 nc = ncs[0]; 1605 1606 for (i = 0; i < queues; i++) { 1607 ncs[i]->link_down = !up; 1608 } 1609 1610 if (nc->info->link_status_changed) { 1611 nc->info->link_status_changed(nc); 1612 } 1613 1614 if (nc->peer) { 1615 /* Change peer link only if the peer is NIC and then notify peer. 1616 * If the peer is a HUBPORT or a backend, we do not change the 1617 * link status. 1618 * 1619 * This behavior is compatible with qemu hubs where there could be 1620 * multiple clients that can still communicate with each other in 1621 * disconnected mode. For now maintain this compatibility. 1622 */ 1623 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1624 for (i = 0; i < queues; i++) { 1625 ncs[i]->peer->link_down = !up; 1626 } 1627 } 1628 if (nc->peer->info->link_status_changed) { 1629 nc->peer->info->link_status_changed(nc->peer); 1630 } 1631 } 1632 } 1633 1634 static void net_vm_change_state_handler(void *opaque, bool running, 1635 RunState state) 1636 { 1637 NetClientState *nc; 1638 NetClientState *tmp; 1639 1640 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1641 if (running) { 1642 /* Flush queued packets and wake up backends. */ 1643 if (nc->peer && qemu_can_send_packet(nc)) { 1644 qemu_flush_queued_packets(nc->peer); 1645 } 1646 } else { 1647 /* Complete all queued packets, to guarantee we don't modify 1648 * state later when VM is not running. 1649 */ 1650 qemu_flush_or_purge_queued_packets(nc, true); 1651 } 1652 } 1653 } 1654 1655 void net_cleanup(void) 1656 { 1657 NetClientState *nc, **p = &QTAILQ_FIRST(&net_clients); 1658 1659 /*cleanup colo compare module for COLO*/ 1660 colo_compare_cleanup(); 1661 1662 /* 1663 * Walk the net_clients list and remove the netdevs but *not* any 1664 * NET_CLIENT_DRIVER_NIC entries. The latter are owned by the device 1665 * model which created them, and in some cases (e.g. xen-net-device) 1666 * the device itself may do cleanup at exit and will be upset if we 1667 * just delete its NIC from underneath it. 1668 * 1669 * Since qemu_del_net_client() may delete multiple entries, using 1670 * QTAILQ_FOREACH_SAFE() is not safe here. The only safe pointer 1671 * to keep as a bookmark is a NET_CLIENT_DRIVER_NIC entry, so keep 1672 * 'p' pointing to either the head of the list, or the 'next' field 1673 * of the latest NET_CLIENT_DRIVER_NIC, and operate on *p as we walk 1674 * the list. 1675 * 1676 * The 'nc' variable isn't part of the list traversal; it's purely 1677 * for convenience as too much '(*p)->' has a tendency to make the 1678 * readers' eyes bleed. 1679 */ 1680 while (*p) { 1681 nc = *p; 1682 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1683 /* Skip NET_CLIENT_DRIVER_NIC entries */ 1684 p = &QTAILQ_NEXT(nc, next); 1685 } else { 1686 qemu_del_net_client(nc); 1687 } 1688 } 1689 1690 qemu_del_vm_change_state_handler(net_change_state_entry); 1691 } 1692 1693 void net_check_clients(void) 1694 { 1695 NetClientState *nc; 1696 int i; 1697 1698 if (nic_model_help) { 1699 show_nic_models(); 1700 exit(0); 1701 } 1702 net_hub_check_clients(); 1703 1704 QTAILQ_FOREACH(nc, &net_clients, next) { 1705 if (!nc->peer) { 1706 warn_report("%s %s has no peer", 1707 nc->info->type == NET_CLIENT_DRIVER_NIC 1708 ? "nic" : "netdev", 1709 nc->name); 1710 } 1711 } 1712 1713 /* Check that all NICs requested via -net nic actually got created. 1714 * NICs created via -device don't need to be checked here because 1715 * they are always instantiated. 1716 */ 1717 for (i = 0; i < MAX_NICS; i++) { 1718 NICInfo *nd = &nd_table[i]; 1719 if (nd->used && !nd->instantiated) { 1720 warn_report("requested NIC (%s, model %s) " 1721 "was not created (not supported by this machine?)", 1722 nd->name ? nd->name : "anonymous", 1723 nd->model ? nd->model : "unspecified"); 1724 } 1725 } 1726 } 1727 1728 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1729 { 1730 const char *model = qemu_opt_get(opts, "model"); 1731 1732 if (is_nic_model_help_option(model)) { 1733 return 0; 1734 } 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 (is_nic_model_help_option(ni->model)) { 1793 return 0; 1794 } 1795 1796 /* Create an ID if the user did not specify one */ 1797 nd_id = g_strdup(qemu_opts_id(opts)); 1798 if (!nd_id) { 1799 nd_id = id_generate(ID_NET); 1800 qemu_opts_set_id(opts, nd_id); 1801 } 1802 1803 /* Handle MAC address */ 1804 mac = qemu_opt_get_del(opts, "mac"); 1805 if (mac) { 1806 ret = net_parse_macaddr(ni->macaddr.a, mac); 1807 g_free(mac); 1808 if (ret) { 1809 error_setg(errp, "invalid syntax for ethernet address"); 1810 goto out; 1811 } 1812 if (is_multicast_ether_addr(ni->macaddr.a)) { 1813 error_setg(errp, "NIC cannot have multicast MAC address"); 1814 ret = -1; 1815 goto out; 1816 } 1817 } 1818 qemu_macaddr_default_if_unset(&ni->macaddr); 1819 1820 ret = net_client_init(opts, true, errp); 1821 if (ret == 0) { 1822 ni->netdev = qemu_find_netdev(nd_id); 1823 ni->used = true; 1824 nb_nics++; 1825 } 1826 1827 out: 1828 g_free(nd_id); 1829 return ret; 1830 } 1831 1832 static void netdev_init_modern(void) 1833 { 1834 while (!QSIMPLEQ_EMPTY(&nd_queue)) { 1835 NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); 1836 1837 QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); 1838 loc_push_restore(&nd->loc); 1839 net_client_init1(nd->nd, true, &error_fatal); 1840 loc_pop(&nd->loc); 1841 qapi_free_Netdev(nd->nd); 1842 g_free(nd); 1843 } 1844 } 1845 1846 void net_init_clients(void) 1847 { 1848 net_change_state_entry = 1849 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1850 1851 QTAILQ_INIT(&net_clients); 1852 1853 netdev_init_modern(); 1854 1855 qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1856 &error_fatal); 1857 1858 qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, 1859 &error_fatal); 1860 1861 qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, 1862 &error_fatal); 1863 } 1864 1865 /* 1866 * Does this -netdev argument use modern rather than traditional syntax? 1867 * Modern syntax is to be parsed with netdev_parse_modern(). 1868 * Traditional syntax is to be parsed with net_client_parse(). 1869 */ 1870 bool netdev_is_modern(const char *optstr) 1871 { 1872 QemuOpts *opts; 1873 bool is_modern; 1874 const char *type; 1875 static QemuOptsList dummy_opts = { 1876 .name = "netdev", 1877 .implied_opt_name = "type", 1878 .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), 1879 .desc = { { } }, 1880 }; 1881 1882 if (optstr[0] == '{') { 1883 /* This is JSON, which means it's modern syntax */ 1884 return true; 1885 } 1886 1887 opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); 1888 qemu_opts_do_parse(opts, optstr, dummy_opts.implied_opt_name, 1889 &error_abort); 1890 type = qemu_opt_get(opts, "type"); 1891 is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); 1892 1893 qemu_opts_reset(&dummy_opts); 1894 1895 return is_modern; 1896 } 1897 1898 /* 1899 * netdev_parse_modern() uses modern, more expressive syntax than 1900 * net_client_parse(), but supports only the -netdev option. 1901 * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() 1902 * appends to @qemu_netdev_opts. 1903 */ 1904 void netdev_parse_modern(const char *optstr) 1905 { 1906 Visitor *v; 1907 NetdevQueueEntry *nd; 1908 1909 v = qobject_input_visitor_new_str(optstr, "type", &error_fatal); 1910 nd = g_new(NetdevQueueEntry, 1); 1911 visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); 1912 visit_free(v); 1913 loc_save(&nd->loc); 1914 1915 QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); 1916 } 1917 1918 void net_client_parse(QemuOptsList *opts_list, const char *optstr) 1919 { 1920 if (!qemu_opts_parse_noisily(opts_list, optstr, true)) { 1921 exit(1); 1922 } 1923 } 1924 1925 /* From FreeBSD */ 1926 /* XXX: optimize */ 1927 uint32_t net_crc32(const uint8_t *p, int len) 1928 { 1929 uint32_t crc; 1930 int carry, i, j; 1931 uint8_t b; 1932 1933 crc = 0xffffffff; 1934 for (i = 0; i < len; i++) { 1935 b = *p++; 1936 for (j = 0; j < 8; j++) { 1937 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1938 crc <<= 1; 1939 b >>= 1; 1940 if (carry) { 1941 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1942 } 1943 } 1944 } 1945 1946 return crc; 1947 } 1948 1949 uint32_t net_crc32_le(const uint8_t *p, int len) 1950 { 1951 uint32_t crc; 1952 int carry, i, j; 1953 uint8_t b; 1954 1955 crc = 0xffffffff; 1956 for (i = 0; i < len; i++) { 1957 b = *p++; 1958 for (j = 0; j < 8; j++) { 1959 carry = (crc & 0x1) ^ (b & 0x01); 1960 crc >>= 1; 1961 b >>= 1; 1962 if (carry) { 1963 crc ^= POLYNOMIAL_LE; 1964 } 1965 } 1966 } 1967 1968 return crc; 1969 } 1970 1971 QemuOptsList qemu_netdev_opts = { 1972 .name = "netdev", 1973 .implied_opt_name = "type", 1974 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1975 .desc = { 1976 /* 1977 * no elements => accept any params 1978 * validation will happen later 1979 */ 1980 { /* end of list */ } 1981 }, 1982 }; 1983 1984 QemuOptsList qemu_nic_opts = { 1985 .name = "nic", 1986 .implied_opt_name = "type", 1987 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1988 .desc = { 1989 /* 1990 * no elements => accept any params 1991 * validation will happen later 1992 */ 1993 { /* end of list */ } 1994 }, 1995 }; 1996 1997 QemuOptsList qemu_net_opts = { 1998 .name = "net", 1999 .implied_opt_name = "type", 2000 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 2001 .desc = { 2002 /* 2003 * no elements => accept any params 2004 * validation will happen later 2005 */ 2006 { /* end of list */ } 2007 }, 2008 }; 2009 2010 void net_socket_rs_init(SocketReadState *rs, 2011 SocketReadStateFinalize *finalize, 2012 bool vnet_hdr) 2013 { 2014 rs->state = 0; 2015 rs->vnet_hdr = vnet_hdr; 2016 rs->index = 0; 2017 rs->packet_len = 0; 2018 rs->vnet_hdr_len = 0; 2019 memset(rs->buf, 0, sizeof(rs->buf)); 2020 rs->finalize = finalize; 2021 } 2022 2023 /* 2024 * Returns 2025 * 0: success 2026 * -1: error occurs 2027 */ 2028 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 2029 { 2030 unsigned int l; 2031 2032 while (size > 0) { 2033 /* Reassemble a packet from the network. 2034 * 0 = getting length. 2035 * 1 = getting vnet header length. 2036 * 2 = getting data. 2037 */ 2038 switch (rs->state) { 2039 case 0: 2040 l = 4 - rs->index; 2041 if (l > size) { 2042 l = size; 2043 } 2044 memcpy(rs->buf + rs->index, buf, l); 2045 buf += l; 2046 size -= l; 2047 rs->index += l; 2048 if (rs->index == 4) { 2049 /* got length */ 2050 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 2051 rs->index = 0; 2052 if (rs->vnet_hdr) { 2053 rs->state = 1; 2054 } else { 2055 rs->state = 2; 2056 rs->vnet_hdr_len = 0; 2057 } 2058 } 2059 break; 2060 case 1: 2061 l = 4 - rs->index; 2062 if (l > size) { 2063 l = size; 2064 } 2065 memcpy(rs->buf + rs->index, buf, l); 2066 buf += l; 2067 size -= l; 2068 rs->index += l; 2069 if (rs->index == 4) { 2070 /* got vnet header length */ 2071 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 2072 rs->index = 0; 2073 rs->state = 2; 2074 } 2075 break; 2076 case 2: 2077 l = rs->packet_len - rs->index; 2078 if (l > size) { 2079 l = size; 2080 } 2081 if (rs->index + l <= sizeof(rs->buf)) { 2082 memcpy(rs->buf + rs->index, buf, l); 2083 } else { 2084 fprintf(stderr, "serious error: oversized packet received," 2085 "connection terminated.\n"); 2086 rs->index = rs->state = 0; 2087 return -1; 2088 } 2089 2090 rs->index += l; 2091 buf += l; 2092 size -= l; 2093 if (rs->index >= rs->packet_len) { 2094 rs->index = 0; 2095 rs->state = 0; 2096 assert(rs->finalize); 2097 rs->finalize(rs); 2098 } 2099 break; 2100 } 2101 } 2102 2103 assert(size == 0); 2104 return 0; 2105 } 2106