1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 27 #include "net/net.h" 28 #include "clients.h" 29 #include "hub.h" 30 #include "hw/qdev-properties.h" 31 #include "net/slirp.h" 32 #include "net/eth.h" 33 #include "util.h" 34 35 #include "monitor/monitor.h" 36 #include "qemu/help_option.h" 37 #include "qapi/qapi-commands-net.h" 38 #include "qapi/qapi-visit-net.h" 39 #include "qapi/qmp/qdict.h" 40 #include "qapi/qmp/qerror.h" 41 #include "qemu/error-report.h" 42 #include "qemu/sockets.h" 43 #include "qemu/cutils.h" 44 #include "qemu/config-file.h" 45 #include "qemu/ctype.h" 46 #include "qemu/id.h" 47 #include "qemu/iov.h" 48 #include "qemu/qemu-print.h" 49 #include "qemu/main-loop.h" 50 #include "qemu/option.h" 51 #include "qemu/keyval.h" 52 #include "qapi/error.h" 53 #include "qapi/opts-visitor.h" 54 #include "sysemu/runstate.h" 55 #include "net/colo-compare.h" 56 #include "net/filter.h" 57 #include "qapi/string-output-visitor.h" 58 #include "qapi/qobject-input-visitor.h" 59 #include "standard-headers/linux/virtio_net.h" 60 61 /* Net bridge is currently not supported for W32. */ 62 #if !defined(_WIN32) 63 # define CONFIG_NET_BRIDGE 64 #endif 65 66 static VMChangeStateEntry *net_change_state_entry; 67 NetClientStateList net_clients; 68 69 typedef struct NetdevQueueEntry { 70 Netdev *nd; 71 Location loc; 72 QSIMPLEQ_ENTRY(NetdevQueueEntry) entry; 73 } NetdevQueueEntry; 74 75 typedef QSIMPLEQ_HEAD(, NetdevQueueEntry) NetdevQueue; 76 77 static NetdevQueue nd_queue = QSIMPLEQ_HEAD_INITIALIZER(nd_queue); 78 79 static GHashTable *nic_model_help; 80 81 static int nb_nics; 82 static NICInfo nd_table[MAX_NICS]; 83 84 /***********************************************************/ 85 /* network device redirectors */ 86 87 int convert_host_port(struct sockaddr_in *saddr, const char *host, 88 const char *port, Error **errp) 89 { 90 struct hostent *he; 91 const char *r; 92 long p; 93 94 memset(saddr, 0, sizeof(*saddr)); 95 96 saddr->sin_family = AF_INET; 97 if (host[0] == '\0') { 98 saddr->sin_addr.s_addr = 0; 99 } else { 100 if (qemu_isdigit(host[0])) { 101 if (!inet_aton(host, &saddr->sin_addr)) { 102 error_setg(errp, "host address '%s' is not a valid " 103 "IPv4 address", host); 104 return -1; 105 } 106 } else { 107 he = gethostbyname(host); 108 if (he == NULL) { 109 error_setg(errp, "can't resolve host address '%s'", host); 110 return -1; 111 } 112 saddr->sin_addr = *(struct in_addr *)he->h_addr; 113 } 114 } 115 if (qemu_strtol(port, &r, 0, &p) != 0) { 116 error_setg(errp, "port number '%s' is invalid", port); 117 return -1; 118 } 119 saddr->sin_port = htons(p); 120 return 0; 121 } 122 123 int parse_host_port(struct sockaddr_in *saddr, const char *str, 124 Error **errp) 125 { 126 gchar **substrings; 127 int ret; 128 129 substrings = g_strsplit(str, ":", 2); 130 if (!substrings || !substrings[0] || !substrings[1]) { 131 error_setg(errp, "host address '%s' doesn't contain ':' " 132 "separating host from port", str); 133 ret = -1; 134 goto out; 135 } 136 137 ret = convert_host_port(saddr, substrings[0], substrings[1], errp); 138 139 out: 140 g_strfreev(substrings); 141 return ret; 142 } 143 144 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 145 { 146 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 147 macaddr[0], macaddr[1], macaddr[2], 148 macaddr[3], macaddr[4], macaddr[5]); 149 } 150 151 void qemu_set_info_str(NetClientState *nc, const char *fmt, ...) 152 { 153 va_list ap; 154 155 va_start(ap, fmt); 156 vsnprintf(nc->info_str, sizeof(nc->info_str), fmt, ap); 157 va_end(ap); 158 } 159 160 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 161 { 162 qemu_set_info_str(nc, "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 163 nc->model, macaddr[0], macaddr[1], macaddr[2], 164 macaddr[3], macaddr[4], macaddr[5]); 165 } 166 167 static int mac_table[256] = {0}; 168 169 static void qemu_macaddr_set_used(MACAddr *macaddr) 170 { 171 int index; 172 173 for (index = 0x56; index < 0xFF; index++) { 174 if (macaddr->a[5] == index) { 175 mac_table[index]++; 176 } 177 } 178 } 179 180 static void qemu_macaddr_set_free(MACAddr *macaddr) 181 { 182 int index; 183 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 184 185 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 186 return; 187 } 188 for (index = 0x56; index < 0xFF; index++) { 189 if (macaddr->a[5] == index) { 190 mac_table[index]--; 191 } 192 } 193 } 194 195 static int qemu_macaddr_get_free(void) 196 { 197 int index; 198 199 for (index = 0x56; index < 0xFF; index++) { 200 if (mac_table[index] == 0) { 201 return index; 202 } 203 } 204 205 return -1; 206 } 207 208 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 209 { 210 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 211 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 212 213 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 214 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 215 return; 216 } else { 217 qemu_macaddr_set_used(macaddr); 218 return; 219 } 220 } 221 222 macaddr->a[0] = 0x52; 223 macaddr->a[1] = 0x54; 224 macaddr->a[2] = 0x00; 225 macaddr->a[3] = 0x12; 226 macaddr->a[4] = 0x34; 227 macaddr->a[5] = qemu_macaddr_get_free(); 228 qemu_macaddr_set_used(macaddr); 229 } 230 231 /** 232 * Generate a name for net client 233 * 234 * Only net clients created with the legacy -net option and NICs need this. 235 */ 236 static char *assign_name(NetClientState *nc1, const char *model) 237 { 238 NetClientState *nc; 239 int id = 0; 240 241 QTAILQ_FOREACH(nc, &net_clients, next) { 242 if (nc == nc1) { 243 continue; 244 } 245 if (strcmp(nc->model, model) == 0) { 246 id++; 247 } 248 } 249 250 return g_strdup_printf("%s.%d", model, id); 251 } 252 253 static void qemu_net_client_destructor(NetClientState *nc) 254 { 255 g_free(nc); 256 } 257 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 258 unsigned flags, 259 const struct iovec *iov, 260 int iovcnt, 261 void *opaque); 262 263 static void qemu_net_client_setup(NetClientState *nc, 264 NetClientInfo *info, 265 NetClientState *peer, 266 const char *model, 267 const char *name, 268 NetClientDestructor *destructor, 269 bool is_datapath) 270 { 271 nc->info = info; 272 nc->model = g_strdup(model); 273 if (name) { 274 nc->name = g_strdup(name); 275 } else { 276 nc->name = assign_name(nc, model); 277 } 278 279 if (peer) { 280 assert(!peer->peer); 281 nc->peer = peer; 282 peer->peer = nc; 283 } 284 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 285 286 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 287 nc->destructor = destructor; 288 nc->is_datapath = is_datapath; 289 QTAILQ_INIT(&nc->filters); 290 } 291 292 NetClientState *qemu_new_net_client(NetClientInfo *info, 293 NetClientState *peer, 294 const char *model, 295 const char *name) 296 { 297 NetClientState *nc; 298 299 assert(info->size >= sizeof(NetClientState)); 300 301 nc = g_malloc0(info->size); 302 qemu_net_client_setup(nc, info, peer, model, name, 303 qemu_net_client_destructor, true); 304 305 return nc; 306 } 307 308 NetClientState *qemu_new_net_control_client(NetClientInfo *info, 309 NetClientState *peer, 310 const char *model, 311 const char *name) 312 { 313 NetClientState *nc; 314 315 assert(info->size >= sizeof(NetClientState)); 316 317 nc = g_malloc0(info->size); 318 qemu_net_client_setup(nc, info, peer, model, name, 319 qemu_net_client_destructor, false); 320 321 return nc; 322 } 323 324 NICState *qemu_new_nic(NetClientInfo *info, 325 NICConf *conf, 326 const char *model, 327 const char *name, 328 MemReentrancyGuard *reentrancy_guard, 329 void *opaque) 330 { 331 NetClientState **peers = conf->peers.ncs; 332 NICState *nic; 333 int i, queues = MAX(1, conf->peers.queues); 334 335 assert(info->type == NET_CLIENT_DRIVER_NIC); 336 assert(info->size >= sizeof(NICState)); 337 338 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 339 nic->ncs = (void *)nic + info->size; 340 nic->conf = conf; 341 nic->reentrancy_guard = reentrancy_guard, 342 nic->opaque = opaque; 343 344 for (i = 0; i < queues; i++) { 345 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 346 NULL, true); 347 nic->ncs[i].queue_index = i; 348 } 349 350 return nic; 351 } 352 353 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 354 { 355 return nic->ncs + queue_index; 356 } 357 358 NetClientState *qemu_get_queue(NICState *nic) 359 { 360 return qemu_get_subqueue(nic, 0); 361 } 362 363 NICState *qemu_get_nic(NetClientState *nc) 364 { 365 NetClientState *nc0 = nc - nc->queue_index; 366 367 return (NICState *)((void *)nc0 - nc->info->size); 368 } 369 370 void *qemu_get_nic_opaque(NetClientState *nc) 371 { 372 NICState *nic = qemu_get_nic(nc); 373 374 return nic->opaque; 375 } 376 377 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 378 { 379 assert(nc != NULL); 380 NetClientState *ncs = nc + queue_index; 381 return ncs->peer; 382 } 383 384 static void qemu_cleanup_net_client(NetClientState *nc) 385 { 386 QTAILQ_REMOVE(&net_clients, nc, next); 387 388 if (nc->info->cleanup) { 389 nc->info->cleanup(nc); 390 } 391 } 392 393 static void qemu_free_net_client(NetClientState *nc) 394 { 395 if (nc->incoming_queue) { 396 qemu_del_net_queue(nc->incoming_queue); 397 } 398 if (nc->peer) { 399 nc->peer->peer = NULL; 400 } 401 g_free(nc->name); 402 g_free(nc->model); 403 if (nc->destructor) { 404 nc->destructor(nc); 405 } 406 } 407 408 void qemu_del_net_client(NetClientState *nc) 409 { 410 NetClientState *ncs[MAX_QUEUE_NUM]; 411 int queues, i; 412 NetFilterState *nf, *next; 413 414 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 415 416 /* If the NetClientState belongs to a multiqueue backend, we will change all 417 * other NetClientStates also. 418 */ 419 queues = qemu_find_net_clients_except(nc->name, ncs, 420 NET_CLIENT_DRIVER_NIC, 421 MAX_QUEUE_NUM); 422 assert(queues != 0); 423 424 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 425 object_unparent(OBJECT(nf)); 426 } 427 428 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 429 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 430 NICState *nic = qemu_get_nic(nc->peer); 431 if (nic->peer_deleted) { 432 return; 433 } 434 nic->peer_deleted = true; 435 436 for (i = 0; i < queues; i++) { 437 ncs[i]->peer->link_down = true; 438 } 439 440 if (nc->peer->info->link_status_changed) { 441 nc->peer->info->link_status_changed(nc->peer); 442 } 443 444 for (i = 0; i < queues; i++) { 445 qemu_cleanup_net_client(ncs[i]); 446 } 447 448 return; 449 } 450 451 for (i = 0; i < queues; i++) { 452 qemu_cleanup_net_client(ncs[i]); 453 qemu_free_net_client(ncs[i]); 454 } 455 } 456 457 void qemu_del_nic(NICState *nic) 458 { 459 int i, queues = MAX(nic->conf->peers.queues, 1); 460 461 qemu_macaddr_set_free(&nic->conf->macaddr); 462 463 for (i = 0; i < queues; i++) { 464 NetClientState *nc = qemu_get_subqueue(nic, i); 465 /* If this is a peer NIC and peer has already been deleted, free it now. */ 466 if (nic->peer_deleted) { 467 qemu_free_net_client(nc->peer); 468 } else if (nc->peer) { 469 /* if there are RX packets pending, complete them */ 470 qemu_purge_queued_packets(nc->peer); 471 } 472 } 473 474 for (i = queues - 1; i >= 0; i--) { 475 NetClientState *nc = qemu_get_subqueue(nic, i); 476 477 qemu_cleanup_net_client(nc); 478 qemu_free_net_client(nc); 479 } 480 481 g_free(nic); 482 } 483 484 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 485 { 486 NetClientState *nc; 487 488 QTAILQ_FOREACH(nc, &net_clients, next) { 489 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 490 if (nc->queue_index == 0) { 491 func(qemu_get_nic(nc), opaque); 492 } 493 } 494 } 495 } 496 497 bool qemu_has_ufo(NetClientState *nc) 498 { 499 if (!nc || !nc->info->has_ufo) { 500 return false; 501 } 502 503 return nc->info->has_ufo(nc); 504 } 505 506 bool qemu_has_uso(NetClientState *nc) 507 { 508 if (!nc || !nc->info->has_uso) { 509 return false; 510 } 511 512 return nc->info->has_uso(nc); 513 } 514 515 bool qemu_has_vnet_hdr(NetClientState *nc) 516 { 517 if (!nc || !nc->info->has_vnet_hdr) { 518 return false; 519 } 520 521 return nc->info->has_vnet_hdr(nc); 522 } 523 524 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 525 { 526 if (!nc || !nc->info->has_vnet_hdr_len) { 527 return false; 528 } 529 530 return nc->info->has_vnet_hdr_len(nc, len); 531 } 532 533 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 534 int ecn, int ufo, int uso4, int uso6) 535 { 536 if (!nc || !nc->info->set_offload) { 537 return; 538 } 539 540 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo, uso4, uso6); 541 } 542 543 int qemu_get_vnet_hdr_len(NetClientState *nc) 544 { 545 if (!nc) { 546 return 0; 547 } 548 549 return nc->vnet_hdr_len; 550 } 551 552 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 553 { 554 if (!nc || !nc->info->set_vnet_hdr_len) { 555 return; 556 } 557 558 assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) || 559 len == sizeof(struct virtio_net_hdr) || 560 len == sizeof(struct virtio_net_hdr_v1_hash)); 561 562 nc->vnet_hdr_len = len; 563 nc->info->set_vnet_hdr_len(nc, len); 564 } 565 566 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 567 { 568 #if HOST_BIG_ENDIAN 569 if (!nc || !nc->info->set_vnet_le) { 570 return -ENOSYS; 571 } 572 573 return nc->info->set_vnet_le(nc, is_le); 574 #else 575 return 0; 576 #endif 577 } 578 579 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 580 { 581 #if HOST_BIG_ENDIAN 582 return 0; 583 #else 584 if (!nc || !nc->info->set_vnet_be) { 585 return -ENOSYS; 586 } 587 588 return nc->info->set_vnet_be(nc, is_be); 589 #endif 590 } 591 592 int qemu_can_receive_packet(NetClientState *nc) 593 { 594 if (nc->receive_disabled) { 595 return 0; 596 } else if (nc->info->can_receive && 597 !nc->info->can_receive(nc)) { 598 return 0; 599 } 600 return 1; 601 } 602 603 int qemu_can_send_packet(NetClientState *sender) 604 { 605 int vm_running = runstate_is_running(); 606 607 if (!vm_running) { 608 return 0; 609 } 610 611 if (!sender->peer) { 612 return 1; 613 } 614 615 return qemu_can_receive_packet(sender->peer); 616 } 617 618 static ssize_t filter_receive_iov(NetClientState *nc, 619 NetFilterDirection direction, 620 NetClientState *sender, 621 unsigned flags, 622 const struct iovec *iov, 623 int iovcnt, 624 NetPacketSent *sent_cb) 625 { 626 ssize_t ret = 0; 627 NetFilterState *nf = NULL; 628 629 if (direction == NET_FILTER_DIRECTION_TX) { 630 QTAILQ_FOREACH(nf, &nc->filters, next) { 631 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 632 iovcnt, sent_cb); 633 if (ret) { 634 return ret; 635 } 636 } 637 } else { 638 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 639 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 640 iovcnt, sent_cb); 641 if (ret) { 642 return ret; 643 } 644 } 645 } 646 647 return ret; 648 } 649 650 static ssize_t filter_receive(NetClientState *nc, 651 NetFilterDirection direction, 652 NetClientState *sender, 653 unsigned flags, 654 const uint8_t *data, 655 size_t size, 656 NetPacketSent *sent_cb) 657 { 658 struct iovec iov = { 659 .iov_base = (void *)data, 660 .iov_len = size 661 }; 662 663 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 664 } 665 666 void qemu_purge_queued_packets(NetClientState *nc) 667 { 668 if (!nc->peer) { 669 return; 670 } 671 672 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 673 } 674 675 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 676 { 677 nc->receive_disabled = 0; 678 679 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 680 if (net_hub_flush(nc->peer)) { 681 qemu_notify_event(); 682 } 683 } 684 if (qemu_net_queue_flush(nc->incoming_queue)) { 685 /* We emptied the queue successfully, signal to the IO thread to repoll 686 * the file descriptor (for tap, for example). 687 */ 688 qemu_notify_event(); 689 } else if (purge) { 690 /* Unable to empty the queue, purge remaining packets */ 691 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 692 } 693 } 694 695 void qemu_flush_queued_packets(NetClientState *nc) 696 { 697 qemu_flush_or_purge_queued_packets(nc, false); 698 } 699 700 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 701 unsigned flags, 702 const uint8_t *buf, int size, 703 NetPacketSent *sent_cb) 704 { 705 NetQueue *queue; 706 int ret; 707 708 #ifdef DEBUG_NET 709 printf("qemu_send_packet_async:\n"); 710 qemu_hexdump(stdout, "net", buf, size); 711 #endif 712 713 if (sender->link_down || !sender->peer) { 714 return size; 715 } 716 717 /* Let filters handle the packet first */ 718 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 719 sender, flags, buf, size, sent_cb); 720 if (ret) { 721 return ret; 722 } 723 724 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 725 sender, flags, buf, size, sent_cb); 726 if (ret) { 727 return ret; 728 } 729 730 queue = sender->peer->incoming_queue; 731 732 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 733 } 734 735 ssize_t qemu_send_packet_async(NetClientState *sender, 736 const uint8_t *buf, int size, 737 NetPacketSent *sent_cb) 738 { 739 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 740 buf, size, sent_cb); 741 } 742 743 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 744 { 745 return qemu_send_packet_async(nc, buf, size, NULL); 746 } 747 748 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 749 { 750 if (!qemu_can_receive_packet(nc)) { 751 return 0; 752 } 753 754 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 755 } 756 757 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 758 int iovcnt) 759 { 760 if (!qemu_can_receive_packet(nc)) { 761 return 0; 762 } 763 764 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 765 } 766 767 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 768 { 769 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 770 buf, size, NULL); 771 } 772 773 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 774 int iovcnt, unsigned flags) 775 { 776 uint8_t *buf = NULL; 777 uint8_t *buffer; 778 size_t offset; 779 ssize_t ret; 780 781 if (iovcnt == 1) { 782 buffer = iov[0].iov_base; 783 offset = iov[0].iov_len; 784 } else { 785 offset = iov_size(iov, iovcnt); 786 if (offset > NET_BUFSIZE) { 787 return -1; 788 } 789 buf = g_malloc(offset); 790 buffer = buf; 791 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 792 } 793 794 ret = nc->info->receive(nc, buffer, offset); 795 796 g_free(buf); 797 return ret; 798 } 799 800 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 801 unsigned flags, 802 const struct iovec *iov, 803 int iovcnt, 804 void *opaque) 805 { 806 MemReentrancyGuard *owned_reentrancy_guard; 807 NetClientState *nc = opaque; 808 int ret; 809 struct virtio_net_hdr_v1_hash vnet_hdr = { }; 810 g_autofree struct iovec *iov_copy = NULL; 811 812 813 if (nc->link_down) { 814 return iov_size(iov, iovcnt); 815 } 816 817 if (nc->receive_disabled) { 818 return 0; 819 } 820 821 if (nc->info->type != NET_CLIENT_DRIVER_NIC || 822 qemu_get_nic(nc)->reentrancy_guard->engaged_in_io) { 823 owned_reentrancy_guard = NULL; 824 } else { 825 owned_reentrancy_guard = qemu_get_nic(nc)->reentrancy_guard; 826 owned_reentrancy_guard->engaged_in_io = true; 827 } 828 829 if ((flags & QEMU_NET_PACKET_FLAG_RAW) && nc->vnet_hdr_len) { 830 iov_copy = g_new(struct iovec, iovcnt + 1); 831 iov_copy[0].iov_base = &vnet_hdr; 832 iov_copy[0].iov_len = nc->vnet_hdr_len; 833 memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); 834 iov = iov_copy; 835 } 836 837 if (nc->info->receive_iov) { 838 ret = nc->info->receive_iov(nc, iov, iovcnt); 839 } else { 840 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 841 } 842 843 if (owned_reentrancy_guard) { 844 owned_reentrancy_guard->engaged_in_io = false; 845 } 846 847 if (ret == 0) { 848 nc->receive_disabled = 1; 849 } 850 851 return ret; 852 } 853 854 ssize_t qemu_sendv_packet_async(NetClientState *sender, 855 const struct iovec *iov, int iovcnt, 856 NetPacketSent *sent_cb) 857 { 858 NetQueue *queue; 859 size_t size = iov_size(iov, iovcnt); 860 int ret; 861 862 if (size > NET_BUFSIZE) { 863 return size; 864 } 865 866 if (sender->link_down || !sender->peer) { 867 return size; 868 } 869 870 /* Let filters handle the packet first */ 871 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 872 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 873 if (ret) { 874 return ret; 875 } 876 877 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 878 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 879 if (ret) { 880 return ret; 881 } 882 883 queue = sender->peer->incoming_queue; 884 885 return qemu_net_queue_send_iov(queue, sender, 886 QEMU_NET_PACKET_FLAG_NONE, 887 iov, iovcnt, sent_cb); 888 } 889 890 ssize_t 891 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 892 { 893 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 894 } 895 896 NetClientState *qemu_find_netdev(const char *id) 897 { 898 NetClientState *nc; 899 900 QTAILQ_FOREACH(nc, &net_clients, next) { 901 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 902 continue; 903 if (!strcmp(nc->name, id)) { 904 return nc; 905 } 906 } 907 908 return NULL; 909 } 910 911 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 912 NetClientDriver type, int max) 913 { 914 NetClientState *nc; 915 int ret = 0; 916 917 QTAILQ_FOREACH(nc, &net_clients, next) { 918 if (nc->info->type == type) { 919 continue; 920 } 921 if (!id || !strcmp(nc->name, id)) { 922 if (ret < max) { 923 ncs[ret] = nc; 924 } 925 ret++; 926 } 927 } 928 929 return ret; 930 } 931 932 static int nic_get_free_idx(void) 933 { 934 int index; 935 936 for (index = 0; index < MAX_NICS; index++) 937 if (!nd_table[index].used) 938 return index; 939 return -1; 940 } 941 942 GPtrArray *qemu_get_nic_models(const char *device_type) 943 { 944 GPtrArray *nic_models = g_ptr_array_new(); 945 GSList *list = object_class_get_list_sorted(device_type, false); 946 947 while (list) { 948 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data, 949 TYPE_DEVICE); 950 GSList *next; 951 if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) && 952 dc->user_creatable) { 953 const char *name = object_class_get_name(list->data); 954 /* 955 * A network device might also be something else than a NIC, see 956 * e.g. the "rocker" device. Thus we have to look for the "netdev" 957 * property, too. Unfortunately, some devices like virtio-net only 958 * create this property during instance_init, so we have to create 959 * a temporary instance here to be able to check it. 960 */ 961 Object *obj = object_new_with_class(OBJECT_CLASS(dc)); 962 if (object_property_find(obj, "netdev")) { 963 g_ptr_array_add(nic_models, (gpointer)name); 964 } 965 object_unref(obj); 966 } 967 next = list->next; 968 g_slist_free_1(list); 969 list = next; 970 } 971 g_ptr_array_add(nic_models, NULL); 972 973 return nic_models; 974 } 975 976 static int net_init_nic(const Netdev *netdev, const char *name, 977 NetClientState *peer, Error **errp) 978 { 979 int idx; 980 NICInfo *nd; 981 const NetLegacyNicOptions *nic; 982 983 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 984 nic = &netdev->u.nic; 985 986 idx = nic_get_free_idx(); 987 if (idx == -1 || nb_nics >= MAX_NICS) { 988 error_setg(errp, "too many NICs"); 989 return -1; 990 } 991 992 nd = &nd_table[idx]; 993 994 memset(nd, 0, sizeof(*nd)); 995 996 if (nic->netdev) { 997 nd->netdev = qemu_find_netdev(nic->netdev); 998 if (!nd->netdev) { 999 error_setg(errp, "netdev '%s' not found", nic->netdev); 1000 return -1; 1001 } 1002 } else { 1003 assert(peer); 1004 nd->netdev = peer; 1005 } 1006 nd->name = g_strdup(name); 1007 if (nic->model) { 1008 nd->model = g_strdup(nic->model); 1009 } 1010 if (nic->addr) { 1011 nd->devaddr = g_strdup(nic->addr); 1012 } 1013 1014 if (nic->macaddr && 1015 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 1016 error_setg(errp, "invalid syntax for ethernet address"); 1017 return -1; 1018 } 1019 if (nic->macaddr && 1020 is_multicast_ether_addr(nd->macaddr.a)) { 1021 error_setg(errp, 1022 "NIC cannot have multicast MAC address (odd 1st byte)"); 1023 return -1; 1024 } 1025 qemu_macaddr_default_if_unset(&nd->macaddr); 1026 1027 if (nic->has_vectors) { 1028 if (nic->vectors > 0x7ffffff) { 1029 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 1030 return -1; 1031 } 1032 nd->nvectors = nic->vectors; 1033 } else { 1034 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 1035 } 1036 1037 nd->used = 1; 1038 nb_nics++; 1039 1040 return idx; 1041 } 1042 1043 static gboolean add_nic_result(gpointer key, gpointer value, gpointer user_data) 1044 { 1045 GPtrArray *results = user_data; 1046 GPtrArray *alias_list = value; 1047 const char *model = key; 1048 char *result; 1049 1050 if (!alias_list) { 1051 result = g_strdup(model); 1052 } else { 1053 GString *result_str = g_string_new(model); 1054 int i; 1055 1056 g_string_append(result_str, " (aka "); 1057 for (i = 0; i < alias_list->len; i++) { 1058 if (i) { 1059 g_string_append(result_str, ", "); 1060 } 1061 g_string_append(result_str, alias_list->pdata[i]); 1062 } 1063 g_string_append(result_str, ")"); 1064 result = result_str->str; 1065 g_string_free(result_str, false); 1066 g_ptr_array_unref(alias_list); 1067 } 1068 g_ptr_array_add(results, result); 1069 return true; 1070 } 1071 1072 static int model_cmp(char **a, char **b) 1073 { 1074 return strcmp(*a, *b); 1075 } 1076 1077 static void show_nic_models(void) 1078 { 1079 GPtrArray *results = g_ptr_array_new(); 1080 int i; 1081 1082 g_hash_table_foreach_remove(nic_model_help, add_nic_result, results); 1083 g_ptr_array_sort(results, (GCompareFunc)model_cmp); 1084 1085 printf("Available NIC models for this configuration:\n"); 1086 for (i = 0 ; i < results->len; i++) { 1087 printf("%s\n", (char *)results->pdata[i]); 1088 } 1089 g_hash_table_unref(nic_model_help); 1090 nic_model_help = NULL; 1091 } 1092 1093 static void add_nic_model_help(const char *model, const char *alias) 1094 { 1095 GPtrArray *alias_list = NULL; 1096 1097 if (g_hash_table_lookup_extended(nic_model_help, model, NULL, 1098 (gpointer *)&alias_list)) { 1099 /* Already exists, no alias to add: return */ 1100 if (!alias) { 1101 return; 1102 } 1103 if (alias_list) { 1104 /* Check if this alias is already in the list. Add if not. */ 1105 if (!g_ptr_array_find_with_equal_func(alias_list, alias, 1106 g_str_equal, NULL)) { 1107 g_ptr_array_add(alias_list, g_strdup(alias)); 1108 } 1109 return; 1110 } 1111 } 1112 /* Either this model wasn't in the list already, or a first alias added */ 1113 if (alias) { 1114 alias_list = g_ptr_array_new(); 1115 g_ptr_array_set_free_func(alias_list, g_free); 1116 g_ptr_array_add(alias_list, g_strdup(alias)); 1117 } 1118 g_hash_table_replace(nic_model_help, g_strdup(model), alias_list); 1119 } 1120 1121 NICInfo *qemu_find_nic_info(const char *typename, bool match_default, 1122 const char *alias) 1123 { 1124 NICInfo *nd; 1125 int i; 1126 1127 if (nic_model_help) { 1128 add_nic_model_help(typename, alias); 1129 } 1130 1131 for (i = 0; i < nb_nics; i++) { 1132 nd = &nd_table[i]; 1133 1134 if (!nd->used || nd->instantiated) { 1135 continue; 1136 } 1137 1138 if ((match_default && !nd->model) || !g_strcmp0(nd->model, typename) 1139 || (alias && !g_strcmp0(nd->model, alias))) { 1140 return nd; 1141 } 1142 } 1143 return NULL; 1144 } 1145 1146 static bool is_nic_model_help_option(const char *model) 1147 { 1148 if (model && is_help_option(model)) { 1149 /* 1150 * Trigger the help output by instantiating the hash table which 1151 * will gather tha available models as they get registered. 1152 */ 1153 if (!nic_model_help) { 1154 nic_model_help = g_hash_table_new_full(g_str_hash, g_str_equal, 1155 g_free, NULL); 1156 } 1157 return true; 1158 } 1159 return false; 1160 } 1161 1162 /* "I have created a device. Please configure it if you can" */ 1163 bool qemu_configure_nic_device(DeviceState *dev, bool match_default, 1164 const char *alias) 1165 { 1166 NICInfo *nd = qemu_find_nic_info(object_get_typename(OBJECT(dev)), 1167 match_default, alias); 1168 1169 if (nd) { 1170 qdev_set_nic_properties(dev, nd); 1171 return true; 1172 } 1173 return false; 1174 } 1175 1176 /* "Please create a device, if you have a configuration for it" */ 1177 DeviceState *qemu_create_nic_device(const char *typename, bool match_default, 1178 const char *alias) 1179 { 1180 NICInfo *nd = qemu_find_nic_info(typename, match_default, alias); 1181 DeviceState *dev; 1182 1183 if (!nd) { 1184 return NULL; 1185 } 1186 1187 dev = qdev_new(typename); 1188 qdev_set_nic_properties(dev, nd); 1189 return dev; 1190 } 1191 1192 void qemu_create_nic_bus_devices(BusState *bus, const char *parent_type, 1193 const char *default_model, 1194 const char *alias, const char *alias_target) 1195 { 1196 GPtrArray *nic_models = qemu_get_nic_models(parent_type); 1197 const char *model; 1198 DeviceState *dev; 1199 NICInfo *nd; 1200 int i; 1201 1202 if (nic_model_help) { 1203 if (alias_target) { 1204 add_nic_model_help(alias_target, alias); 1205 } 1206 for (i = 0; i < nic_models->len - 1; i++) { 1207 add_nic_model_help(nic_models->pdata[i], NULL); 1208 } 1209 } 1210 1211 /* Drop the NULL terminator which would make g_str_equal() unhappy */ 1212 nic_models->len--; 1213 1214 for (i = 0; i < nb_nics; i++) { 1215 nd = &nd_table[i]; 1216 1217 if (!nd->used || nd->instantiated) { 1218 continue; 1219 } 1220 1221 model = nd->model ? nd->model : default_model; 1222 if (!model) { 1223 continue; 1224 } 1225 1226 /* Each bus type is allowed *one* substitution */ 1227 if (g_str_equal(model, alias)) { 1228 model = alias_target; 1229 } 1230 1231 if (!g_ptr_array_find_with_equal_func(nic_models, model, 1232 g_str_equal, NULL)) { 1233 /* This NIC does not live on this bus. */ 1234 continue; 1235 } 1236 1237 dev = qdev_new(model); 1238 qdev_set_nic_properties(dev, nd); 1239 qdev_realize_and_unref(dev, bus, &error_fatal); 1240 } 1241 1242 g_ptr_array_free(nic_models, true); 1243 } 1244 1245 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 1246 const Netdev *netdev, 1247 const char *name, 1248 NetClientState *peer, Error **errp) = { 1249 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 1250 #ifdef CONFIG_SLIRP 1251 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1252 #endif 1253 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1254 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1255 [NET_CLIENT_DRIVER_STREAM] = net_init_stream, 1256 [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, 1257 #ifdef CONFIG_VDE 1258 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1259 #endif 1260 #ifdef CONFIG_NETMAP 1261 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1262 #endif 1263 #ifdef CONFIG_AF_XDP 1264 [NET_CLIENT_DRIVER_AF_XDP] = net_init_af_xdp, 1265 #endif 1266 #ifdef CONFIG_NET_BRIDGE 1267 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1268 #endif 1269 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1270 #ifdef CONFIG_VHOST_NET_USER 1271 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1272 #endif 1273 #ifdef CONFIG_VHOST_NET_VDPA 1274 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1275 #endif 1276 #ifdef CONFIG_L2TPV3 1277 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1278 #endif 1279 #ifdef CONFIG_VMNET 1280 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1281 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1282 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1283 #endif /* CONFIG_VMNET */ 1284 }; 1285 1286 1287 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1288 { 1289 NetClientState *peer = NULL; 1290 NetClientState *nc; 1291 1292 if (is_netdev) { 1293 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1294 !net_client_init_fun[netdev->type]) { 1295 error_setg(errp, "network backend '%s' is not compiled into this binary", 1296 NetClientDriver_str(netdev->type)); 1297 return -1; 1298 } 1299 } else { 1300 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1301 return 0; /* nothing to do */ 1302 } 1303 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { 1304 error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", 1305 NetClientDriver_str(netdev->type)); 1306 return -1; 1307 } 1308 1309 if (!net_client_init_fun[netdev->type]) { 1310 error_setg(errp, "network backend '%s' is not compiled into this binary", 1311 NetClientDriver_str(netdev->type)); 1312 return -1; 1313 } 1314 1315 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1316 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1317 !netdev->u.nic.netdev) { 1318 peer = net_hub_add_port(0, NULL, NULL); 1319 } 1320 } 1321 1322 nc = qemu_find_netdev(netdev->id); 1323 if (nc) { 1324 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1325 return -1; 1326 } 1327 1328 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1329 /* FIXME drop when all init functions store an Error */ 1330 if (errp && !*errp) { 1331 error_setg(errp, "Device '%s' could not be initialized", 1332 NetClientDriver_str(netdev->type)); 1333 } 1334 return -1; 1335 } 1336 1337 if (is_netdev) { 1338 nc = qemu_find_netdev(netdev->id); 1339 assert(nc); 1340 nc->is_netdev = true; 1341 } 1342 1343 return 0; 1344 } 1345 1346 void show_netdevs(void) 1347 { 1348 int idx; 1349 const char *available_netdevs[] = { 1350 "socket", 1351 "stream", 1352 "dgram", 1353 "hubport", 1354 "tap", 1355 #ifdef CONFIG_SLIRP 1356 "user", 1357 #endif 1358 #ifdef CONFIG_L2TPV3 1359 "l2tpv3", 1360 #endif 1361 #ifdef CONFIG_VDE 1362 "vde", 1363 #endif 1364 #ifdef CONFIG_NET_BRIDGE 1365 "bridge", 1366 #endif 1367 #ifdef CONFIG_NETMAP 1368 "netmap", 1369 #endif 1370 #ifdef CONFIG_AF_XDP 1371 "af-xdp", 1372 #endif 1373 #ifdef CONFIG_POSIX 1374 "vhost-user", 1375 #endif 1376 #ifdef CONFIG_VHOST_VDPA 1377 "vhost-vdpa", 1378 #endif 1379 #ifdef CONFIG_VMNET 1380 "vmnet-host", 1381 "vmnet-shared", 1382 "vmnet-bridged", 1383 #endif 1384 }; 1385 1386 qemu_printf("Available netdev backend types:\n"); 1387 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1388 qemu_printf("%s\n", available_netdevs[idx]); 1389 } 1390 } 1391 1392 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1393 { 1394 gchar **substrings = NULL; 1395 Netdev *object = NULL; 1396 int ret = -1; 1397 Visitor *v = opts_visitor_new(opts); 1398 1399 /* Parse convenience option format ipv6-net=fec0::0[/64] */ 1400 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1401 1402 if (ip6_net) { 1403 char *prefix_addr; 1404 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1405 1406 substrings = g_strsplit(ip6_net, "/", 2); 1407 if (!substrings || !substrings[0]) { 1408 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1409 "a valid IPv6 prefix"); 1410 goto out; 1411 } 1412 1413 prefix_addr = substrings[0]; 1414 1415 /* Handle user-specified prefix length. */ 1416 if (substrings[1] && 1417 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1418 { 1419 error_setg(errp, 1420 "parameter 'ipv6-net' expects a number after '/'"); 1421 goto out; 1422 } 1423 1424 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1425 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1426 &error_abort); 1427 qemu_opt_unset(opts, "ipv6-net"); 1428 } 1429 1430 /* Create an ID for -net if the user did not specify one */ 1431 if (!is_netdev && !qemu_opts_id(opts)) { 1432 qemu_opts_set_id(opts, id_generate(ID_NET)); 1433 } 1434 1435 if (visit_type_Netdev(v, NULL, &object, errp)) { 1436 ret = net_client_init1(object, is_netdev, errp); 1437 } 1438 1439 qapi_free_Netdev(object); 1440 1441 out: 1442 g_strfreev(substrings); 1443 visit_free(v); 1444 return ret; 1445 } 1446 1447 void netdev_add(QemuOpts *opts, Error **errp) 1448 { 1449 net_client_init(opts, true, errp); 1450 } 1451 1452 void qmp_netdev_add(Netdev *netdev, Error **errp) 1453 { 1454 if (!id_wellformed(netdev->id)) { 1455 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1456 return; 1457 } 1458 1459 net_client_init1(netdev, true, errp); 1460 } 1461 1462 void qmp_netdev_del(const char *id, Error **errp) 1463 { 1464 NetClientState *nc; 1465 QemuOpts *opts; 1466 1467 nc = qemu_find_netdev(id); 1468 if (!nc) { 1469 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1470 "Device '%s' not found", id); 1471 return; 1472 } 1473 1474 if (!nc->is_netdev) { 1475 error_setg(errp, "Device '%s' is not a netdev", id); 1476 return; 1477 } 1478 1479 qemu_del_net_client(nc); 1480 1481 /* 1482 * Wart: we need to delete the QemuOpts associated with netdevs 1483 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1484 * HMP netdev_add. 1485 */ 1486 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1487 if (opts) { 1488 qemu_opts_del(opts); 1489 } 1490 } 1491 1492 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1493 { 1494 char *str; 1495 ObjectProperty *prop; 1496 ObjectPropertyIterator iter; 1497 Visitor *v; 1498 1499 /* generate info str */ 1500 object_property_iter_init(&iter, OBJECT(nf)); 1501 while ((prop = object_property_iter_next(&iter))) { 1502 if (!strcmp(prop->name, "type")) { 1503 continue; 1504 } 1505 v = string_output_visitor_new(false, &str); 1506 object_property_get(OBJECT(nf), prop->name, v, NULL); 1507 visit_complete(v, &str); 1508 visit_free(v); 1509 monitor_printf(mon, ",%s=%s", prop->name, str); 1510 g_free(str); 1511 } 1512 monitor_printf(mon, "\n"); 1513 } 1514 1515 void print_net_client(Monitor *mon, NetClientState *nc) 1516 { 1517 NetFilterState *nf; 1518 1519 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1520 nc->queue_index, 1521 NetClientDriver_str(nc->info->type), 1522 nc->info_str); 1523 if (!QTAILQ_EMPTY(&nc->filters)) { 1524 monitor_printf(mon, "filters:\n"); 1525 } 1526 QTAILQ_FOREACH(nf, &nc->filters, next) { 1527 monitor_printf(mon, " - %s: type=%s", 1528 object_get_canonical_path_component(OBJECT(nf)), 1529 object_get_typename(OBJECT(nf))); 1530 netfilter_print_info(mon, nf); 1531 } 1532 } 1533 1534 RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp) 1535 { 1536 NetClientState *nc; 1537 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1538 1539 QTAILQ_FOREACH(nc, &net_clients, next) { 1540 RxFilterInfo *info; 1541 1542 if (name && strcmp(nc->name, name) != 0) { 1543 continue; 1544 } 1545 1546 /* only query rx-filter information of NIC */ 1547 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1548 if (name) { 1549 error_setg(errp, "net client(%s) isn't a NIC", name); 1550 assert(!filter_list); 1551 return NULL; 1552 } 1553 continue; 1554 } 1555 1556 /* only query information on queue 0 since the info is per nic, 1557 * not per queue 1558 */ 1559 if (nc->queue_index != 0) 1560 continue; 1561 1562 if (nc->info->query_rx_filter) { 1563 info = nc->info->query_rx_filter(nc); 1564 QAPI_LIST_APPEND(tail, info); 1565 } else if (name) { 1566 error_setg(errp, "net client(%s) doesn't support" 1567 " rx-filter querying", name); 1568 assert(!filter_list); 1569 return NULL; 1570 } 1571 1572 if (name) { 1573 break; 1574 } 1575 } 1576 1577 if (filter_list == NULL && name) { 1578 error_setg(errp, "invalid net client name: %s", name); 1579 } 1580 1581 return filter_list; 1582 } 1583 1584 void colo_notify_filters_event(int event, Error **errp) 1585 { 1586 NetClientState *nc; 1587 NetFilterState *nf; 1588 NetFilterClass *nfc = NULL; 1589 Error *local_err = NULL; 1590 1591 QTAILQ_FOREACH(nc, &net_clients, next) { 1592 QTAILQ_FOREACH(nf, &nc->filters, next) { 1593 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1594 nfc->handle_event(nf, event, &local_err); 1595 if (local_err) { 1596 error_propagate(errp, local_err); 1597 return; 1598 } 1599 } 1600 } 1601 } 1602 1603 void qmp_set_link(const char *name, bool up, Error **errp) 1604 { 1605 NetClientState *ncs[MAX_QUEUE_NUM]; 1606 NetClientState *nc; 1607 int queues, i; 1608 1609 queues = qemu_find_net_clients_except(name, ncs, 1610 NET_CLIENT_DRIVER__MAX, 1611 MAX_QUEUE_NUM); 1612 1613 if (queues == 0) { 1614 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1615 "Device '%s' not found", name); 1616 return; 1617 } 1618 nc = ncs[0]; 1619 1620 for (i = 0; i < queues; i++) { 1621 ncs[i]->link_down = !up; 1622 } 1623 1624 if (nc->info->link_status_changed) { 1625 nc->info->link_status_changed(nc); 1626 } 1627 1628 if (nc->peer) { 1629 /* Change peer link only if the peer is NIC and then notify peer. 1630 * If the peer is a HUBPORT or a backend, we do not change the 1631 * link status. 1632 * 1633 * This behavior is compatible with qemu hubs where there could be 1634 * multiple clients that can still communicate with each other in 1635 * disconnected mode. For now maintain this compatibility. 1636 */ 1637 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1638 for (i = 0; i < queues; i++) { 1639 ncs[i]->peer->link_down = !up; 1640 } 1641 } 1642 if (nc->peer->info->link_status_changed) { 1643 nc->peer->info->link_status_changed(nc->peer); 1644 } 1645 } 1646 } 1647 1648 static void net_vm_change_state_handler(void *opaque, bool running, 1649 RunState state) 1650 { 1651 NetClientState *nc; 1652 NetClientState *tmp; 1653 1654 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1655 if (running) { 1656 /* Flush queued packets and wake up backends. */ 1657 if (nc->peer && qemu_can_send_packet(nc)) { 1658 qemu_flush_queued_packets(nc->peer); 1659 } 1660 } else { 1661 /* Complete all queued packets, to guarantee we don't modify 1662 * state later when VM is not running. 1663 */ 1664 qemu_flush_or_purge_queued_packets(nc, true); 1665 } 1666 } 1667 } 1668 1669 void net_cleanup(void) 1670 { 1671 NetClientState *nc, **p = &QTAILQ_FIRST(&net_clients); 1672 1673 /*cleanup colo compare module for COLO*/ 1674 colo_compare_cleanup(); 1675 1676 /* 1677 * Walk the net_clients list and remove the netdevs but *not* any 1678 * NET_CLIENT_DRIVER_NIC entries. The latter are owned by the device 1679 * model which created them, and in some cases (e.g. xen-net-device) 1680 * the device itself may do cleanup at exit and will be upset if we 1681 * just delete its NIC from underneath it. 1682 * 1683 * Since qemu_del_net_client() may delete multiple entries, using 1684 * QTAILQ_FOREACH_SAFE() is not safe here. The only safe pointer 1685 * to keep as a bookmark is a NET_CLIENT_DRIVER_NIC entry, so keep 1686 * 'p' pointing to either the head of the list, or the 'next' field 1687 * of the latest NET_CLIENT_DRIVER_NIC, and operate on *p as we walk 1688 * the list. 1689 * 1690 * The 'nc' variable isn't part of the list traversal; it's purely 1691 * for convenience as too much '(*p)->' has a tendency to make the 1692 * readers' eyes bleed. 1693 */ 1694 while (*p) { 1695 nc = *p; 1696 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1697 /* Skip NET_CLIENT_DRIVER_NIC entries */ 1698 p = &QTAILQ_NEXT(nc, next); 1699 } else { 1700 qemu_del_net_client(nc); 1701 } 1702 } 1703 1704 qemu_del_vm_change_state_handler(net_change_state_entry); 1705 } 1706 1707 void net_check_clients(void) 1708 { 1709 NetClientState *nc; 1710 int i; 1711 1712 if (nic_model_help) { 1713 show_nic_models(); 1714 exit(0); 1715 } 1716 net_hub_check_clients(); 1717 1718 QTAILQ_FOREACH(nc, &net_clients, next) { 1719 if (!nc->peer) { 1720 warn_report("%s %s has no peer", 1721 nc->info->type == NET_CLIENT_DRIVER_NIC 1722 ? "nic" : "netdev", 1723 nc->name); 1724 } 1725 } 1726 1727 /* Check that all NICs requested via -net nic actually got created. 1728 * NICs created via -device don't need to be checked here because 1729 * they are always instantiated. 1730 */ 1731 for (i = 0; i < MAX_NICS; i++) { 1732 NICInfo *nd = &nd_table[i]; 1733 if (nd->used && !nd->instantiated) { 1734 warn_report("requested NIC (%s, model %s) " 1735 "was not created (not supported by this machine?)", 1736 nd->name ? nd->name : "anonymous", 1737 nd->model ? nd->model : "unspecified"); 1738 } 1739 } 1740 } 1741 1742 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1743 { 1744 const char *model = qemu_opt_get(opts, "model"); 1745 1746 if (is_nic_model_help_option(model)) { 1747 return 0; 1748 } 1749 1750 return net_client_init(opts, false, errp); 1751 } 1752 1753 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1754 { 1755 const char *type = qemu_opt_get(opts, "type"); 1756 1757 if (type && is_help_option(type)) { 1758 show_netdevs(); 1759 exit(0); 1760 } 1761 return net_client_init(opts, true, errp); 1762 } 1763 1764 /* For the convenience "--nic" parameter */ 1765 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1766 { 1767 char *mac, *nd_id; 1768 int idx, ret; 1769 NICInfo *ni; 1770 const char *type; 1771 1772 type = qemu_opt_get(opts, "type"); 1773 if (type) { 1774 if (g_str_equal(type, "none")) { 1775 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1776 } 1777 if (is_help_option(type)) { 1778 GPtrArray *nic_models = qemu_get_nic_models(TYPE_DEVICE); 1779 int i; 1780 show_netdevs(); 1781 printf("\n"); 1782 printf("Available NIC models " 1783 "(use -nic model=help for a filtered list):\n"); 1784 for (i = 0 ; nic_models->pdata[i]; i++) { 1785 printf("%s\n", (char *)nic_models->pdata[i]); 1786 } 1787 g_ptr_array_free(nic_models, true); 1788 exit(0); 1789 } 1790 } 1791 1792 idx = nic_get_free_idx(); 1793 if (idx == -1 || nb_nics >= MAX_NICS) { 1794 error_setg(errp, "no more on-board/default NIC slots available"); 1795 return -1; 1796 } 1797 1798 if (!type) { 1799 qemu_opt_set(opts, "type", "user", &error_abort); 1800 } 1801 1802 ni = &nd_table[idx]; 1803 memset(ni, 0, sizeof(*ni)); 1804 ni->model = qemu_opt_get_del(opts, "model"); 1805 1806 if (is_nic_model_help_option(ni->model)) { 1807 return 0; 1808 } 1809 1810 /* Create an ID if the user did not specify one */ 1811 nd_id = g_strdup(qemu_opts_id(opts)); 1812 if (!nd_id) { 1813 nd_id = id_generate(ID_NET); 1814 qemu_opts_set_id(opts, nd_id); 1815 } 1816 1817 /* Handle MAC address */ 1818 mac = qemu_opt_get_del(opts, "mac"); 1819 if (mac) { 1820 ret = net_parse_macaddr(ni->macaddr.a, mac); 1821 g_free(mac); 1822 if (ret) { 1823 error_setg(errp, "invalid syntax for ethernet address"); 1824 goto out; 1825 } 1826 if (is_multicast_ether_addr(ni->macaddr.a)) { 1827 error_setg(errp, "NIC cannot have multicast MAC address"); 1828 ret = -1; 1829 goto out; 1830 } 1831 } 1832 qemu_macaddr_default_if_unset(&ni->macaddr); 1833 1834 ret = net_client_init(opts, true, errp); 1835 if (ret == 0) { 1836 ni->netdev = qemu_find_netdev(nd_id); 1837 ni->used = true; 1838 nb_nics++; 1839 } 1840 1841 out: 1842 g_free(nd_id); 1843 return ret; 1844 } 1845 1846 static void netdev_init_modern(void) 1847 { 1848 while (!QSIMPLEQ_EMPTY(&nd_queue)) { 1849 NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); 1850 1851 QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); 1852 loc_push_restore(&nd->loc); 1853 net_client_init1(nd->nd, true, &error_fatal); 1854 loc_pop(&nd->loc); 1855 qapi_free_Netdev(nd->nd); 1856 g_free(nd); 1857 } 1858 } 1859 1860 void net_init_clients(void) 1861 { 1862 net_change_state_entry = 1863 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1864 1865 QTAILQ_INIT(&net_clients); 1866 1867 netdev_init_modern(); 1868 1869 qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1870 &error_fatal); 1871 1872 qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, 1873 &error_fatal); 1874 1875 qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, 1876 &error_fatal); 1877 } 1878 1879 /* 1880 * Does this -netdev argument use modern rather than traditional syntax? 1881 * Modern syntax is to be parsed with netdev_parse_modern(). 1882 * Traditional syntax is to be parsed with net_client_parse(). 1883 */ 1884 bool netdev_is_modern(const char *optstr) 1885 { 1886 QemuOpts *opts; 1887 bool is_modern; 1888 const char *type; 1889 static QemuOptsList dummy_opts = { 1890 .name = "netdev", 1891 .implied_opt_name = "type", 1892 .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), 1893 .desc = { { } }, 1894 }; 1895 1896 if (optstr[0] == '{') { 1897 /* This is JSON, which means it's modern syntax */ 1898 return true; 1899 } 1900 1901 opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); 1902 qemu_opts_do_parse(opts, optstr, dummy_opts.implied_opt_name, 1903 &error_abort); 1904 type = qemu_opt_get(opts, "type"); 1905 is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); 1906 1907 qemu_opts_reset(&dummy_opts); 1908 1909 return is_modern; 1910 } 1911 1912 /* 1913 * netdev_parse_modern() uses modern, more expressive syntax than 1914 * net_client_parse(), but supports only the -netdev option. 1915 * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() 1916 * appends to @qemu_netdev_opts. 1917 */ 1918 void netdev_parse_modern(const char *optstr) 1919 { 1920 Visitor *v; 1921 NetdevQueueEntry *nd; 1922 1923 v = qobject_input_visitor_new_str(optstr, "type", &error_fatal); 1924 nd = g_new(NetdevQueueEntry, 1); 1925 visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); 1926 visit_free(v); 1927 loc_save(&nd->loc); 1928 1929 QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); 1930 } 1931 1932 void net_client_parse(QemuOptsList *opts_list, const char *optstr) 1933 { 1934 if (!qemu_opts_parse_noisily(opts_list, optstr, true)) { 1935 exit(1); 1936 } 1937 } 1938 1939 /* From FreeBSD */ 1940 /* XXX: optimize */ 1941 uint32_t net_crc32(const uint8_t *p, int len) 1942 { 1943 uint32_t crc; 1944 int carry, i, j; 1945 uint8_t b; 1946 1947 crc = 0xffffffff; 1948 for (i = 0; i < len; i++) { 1949 b = *p++; 1950 for (j = 0; j < 8; j++) { 1951 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1952 crc <<= 1; 1953 b >>= 1; 1954 if (carry) { 1955 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1956 } 1957 } 1958 } 1959 1960 return crc; 1961 } 1962 1963 uint32_t net_crc32_le(const uint8_t *p, int len) 1964 { 1965 uint32_t crc; 1966 int carry, i, j; 1967 uint8_t b; 1968 1969 crc = 0xffffffff; 1970 for (i = 0; i < len; i++) { 1971 b = *p++; 1972 for (j = 0; j < 8; j++) { 1973 carry = (crc & 0x1) ^ (b & 0x01); 1974 crc >>= 1; 1975 b >>= 1; 1976 if (carry) { 1977 crc ^= POLYNOMIAL_LE; 1978 } 1979 } 1980 } 1981 1982 return crc; 1983 } 1984 1985 QemuOptsList qemu_netdev_opts = { 1986 .name = "netdev", 1987 .implied_opt_name = "type", 1988 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1989 .desc = { 1990 /* 1991 * no elements => accept any params 1992 * validation will happen later 1993 */ 1994 { /* end of list */ } 1995 }, 1996 }; 1997 1998 QemuOptsList qemu_nic_opts = { 1999 .name = "nic", 2000 .implied_opt_name = "type", 2001 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 2002 .desc = { 2003 /* 2004 * no elements => accept any params 2005 * validation will happen later 2006 */ 2007 { /* end of list */ } 2008 }, 2009 }; 2010 2011 QemuOptsList qemu_net_opts = { 2012 .name = "net", 2013 .implied_opt_name = "type", 2014 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 2015 .desc = { 2016 /* 2017 * no elements => accept any params 2018 * validation will happen later 2019 */ 2020 { /* end of list */ } 2021 }, 2022 }; 2023 2024 void net_socket_rs_init(SocketReadState *rs, 2025 SocketReadStateFinalize *finalize, 2026 bool vnet_hdr) 2027 { 2028 rs->state = 0; 2029 rs->vnet_hdr = vnet_hdr; 2030 rs->index = 0; 2031 rs->packet_len = 0; 2032 rs->vnet_hdr_len = 0; 2033 memset(rs->buf, 0, sizeof(rs->buf)); 2034 rs->finalize = finalize; 2035 } 2036 2037 /* 2038 * Returns 2039 * 0: success 2040 * -1: error occurs 2041 */ 2042 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 2043 { 2044 unsigned int l; 2045 2046 while (size > 0) { 2047 /* Reassemble a packet from the network. 2048 * 0 = getting length. 2049 * 1 = getting vnet header length. 2050 * 2 = getting data. 2051 */ 2052 switch (rs->state) { 2053 case 0: 2054 l = 4 - rs->index; 2055 if (l > size) { 2056 l = size; 2057 } 2058 memcpy(rs->buf + rs->index, buf, l); 2059 buf += l; 2060 size -= l; 2061 rs->index += l; 2062 if (rs->index == 4) { 2063 /* got length */ 2064 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 2065 rs->index = 0; 2066 if (rs->vnet_hdr) { 2067 rs->state = 1; 2068 } else { 2069 rs->state = 2; 2070 rs->vnet_hdr_len = 0; 2071 } 2072 } 2073 break; 2074 case 1: 2075 l = 4 - rs->index; 2076 if (l > size) { 2077 l = size; 2078 } 2079 memcpy(rs->buf + rs->index, buf, l); 2080 buf += l; 2081 size -= l; 2082 rs->index += l; 2083 if (rs->index == 4) { 2084 /* got vnet header length */ 2085 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 2086 rs->index = 0; 2087 rs->state = 2; 2088 } 2089 break; 2090 case 2: 2091 l = rs->packet_len - rs->index; 2092 if (l > size) { 2093 l = size; 2094 } 2095 if (rs->index + l <= sizeof(rs->buf)) { 2096 memcpy(rs->buf + rs->index, buf, l); 2097 } else { 2098 fprintf(stderr, "serious error: oversized packet received," 2099 "connection terminated.\n"); 2100 rs->index = rs->state = 0; 2101 return -1; 2102 } 2103 2104 rs->index += l; 2105 buf += l; 2106 size -= l; 2107 if (rs->index >= rs->packet_len) { 2108 rs->index = 0; 2109 rs->state = 0; 2110 assert(rs->finalize); 2111 rs->finalize(rs); 2112 } 2113 break; 2114 } 2115 } 2116 2117 assert(size == 0); 2118 return 0; 2119 } 2120