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