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 void *opaque) 323 { 324 NetClientState **peers = conf->peers.ncs; 325 NICState *nic; 326 int i, queues = MAX(1, conf->peers.queues); 327 328 assert(info->type == NET_CLIENT_DRIVER_NIC); 329 assert(info->size >= sizeof(NICState)); 330 331 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 332 nic->ncs = (void *)nic + info->size; 333 nic->conf = conf; 334 nic->opaque = opaque; 335 336 for (i = 0; i < queues; i++) { 337 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 338 NULL, true); 339 nic->ncs[i].queue_index = i; 340 } 341 342 return nic; 343 } 344 345 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 346 { 347 return nic->ncs + queue_index; 348 } 349 350 NetClientState *qemu_get_queue(NICState *nic) 351 { 352 return qemu_get_subqueue(nic, 0); 353 } 354 355 NICState *qemu_get_nic(NetClientState *nc) 356 { 357 NetClientState *nc0 = nc - nc->queue_index; 358 359 return (NICState *)((void *)nc0 - nc->info->size); 360 } 361 362 void *qemu_get_nic_opaque(NetClientState *nc) 363 { 364 NICState *nic = qemu_get_nic(nc); 365 366 return nic->opaque; 367 } 368 369 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 370 { 371 assert(nc != NULL); 372 NetClientState *ncs = nc + queue_index; 373 return ncs->peer; 374 } 375 376 static void qemu_cleanup_net_client(NetClientState *nc) 377 { 378 QTAILQ_REMOVE(&net_clients, nc, next); 379 380 if (nc->info->cleanup) { 381 nc->info->cleanup(nc); 382 } 383 } 384 385 static void qemu_free_net_client(NetClientState *nc) 386 { 387 if (nc->incoming_queue) { 388 qemu_del_net_queue(nc->incoming_queue); 389 } 390 if (nc->peer) { 391 nc->peer->peer = NULL; 392 } 393 g_free(nc->name); 394 g_free(nc->model); 395 if (nc->destructor) { 396 nc->destructor(nc); 397 } 398 } 399 400 void qemu_del_net_client(NetClientState *nc) 401 { 402 NetClientState *ncs[MAX_QUEUE_NUM]; 403 int queues, i; 404 NetFilterState *nf, *next; 405 406 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 407 408 /* If the NetClientState belongs to a multiqueue backend, we will change all 409 * other NetClientStates also. 410 */ 411 queues = qemu_find_net_clients_except(nc->name, ncs, 412 NET_CLIENT_DRIVER_NIC, 413 MAX_QUEUE_NUM); 414 assert(queues != 0); 415 416 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 417 object_unparent(OBJECT(nf)); 418 } 419 420 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 421 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 422 NICState *nic = qemu_get_nic(nc->peer); 423 if (nic->peer_deleted) { 424 return; 425 } 426 nic->peer_deleted = true; 427 428 for (i = 0; i < queues; i++) { 429 ncs[i]->peer->link_down = true; 430 } 431 432 if (nc->peer->info->link_status_changed) { 433 nc->peer->info->link_status_changed(nc->peer); 434 } 435 436 for (i = 0; i < queues; i++) { 437 qemu_cleanup_net_client(ncs[i]); 438 } 439 440 return; 441 } 442 443 for (i = 0; i < queues; i++) { 444 qemu_cleanup_net_client(ncs[i]); 445 qemu_free_net_client(ncs[i]); 446 } 447 } 448 449 void qemu_del_nic(NICState *nic) 450 { 451 int i, queues = MAX(nic->conf->peers.queues, 1); 452 453 qemu_macaddr_set_free(&nic->conf->macaddr); 454 455 for (i = 0; i < queues; i++) { 456 NetClientState *nc = qemu_get_subqueue(nic, i); 457 /* If this is a peer NIC and peer has already been deleted, free it now. */ 458 if (nic->peer_deleted) { 459 qemu_free_net_client(nc->peer); 460 } else if (nc->peer) { 461 /* if there are RX packets pending, complete them */ 462 qemu_purge_queued_packets(nc->peer); 463 } 464 } 465 466 for (i = queues - 1; i >= 0; i--) { 467 NetClientState *nc = qemu_get_subqueue(nic, i); 468 469 qemu_cleanup_net_client(nc); 470 qemu_free_net_client(nc); 471 } 472 473 g_free(nic); 474 } 475 476 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 477 { 478 NetClientState *nc; 479 480 QTAILQ_FOREACH(nc, &net_clients, next) { 481 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 482 if (nc->queue_index == 0) { 483 func(qemu_get_nic(nc), opaque); 484 } 485 } 486 } 487 } 488 489 bool qemu_has_ufo(NetClientState *nc) 490 { 491 if (!nc || !nc->info->has_ufo) { 492 return false; 493 } 494 495 return nc->info->has_ufo(nc); 496 } 497 498 bool qemu_has_uso(NetClientState *nc) 499 { 500 if (!nc || !nc->info->has_uso) { 501 return false; 502 } 503 504 return nc->info->has_uso(nc); 505 } 506 507 bool qemu_has_vnet_hdr(NetClientState *nc) 508 { 509 if (!nc || !nc->info->has_vnet_hdr) { 510 return false; 511 } 512 513 return nc->info->has_vnet_hdr(nc); 514 } 515 516 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 517 { 518 if (!nc || !nc->info->has_vnet_hdr_len) { 519 return false; 520 } 521 522 return nc->info->has_vnet_hdr_len(nc, len); 523 } 524 525 bool qemu_get_using_vnet_hdr(NetClientState *nc) 526 { 527 if (!nc || !nc->info->get_using_vnet_hdr) { 528 return false; 529 } 530 531 return nc->info->get_using_vnet_hdr(nc); 532 } 533 534 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 535 { 536 if (!nc || !nc->info->using_vnet_hdr) { 537 return; 538 } 539 540 nc->info->using_vnet_hdr(nc, enable); 541 } 542 543 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 544 int ecn, int ufo, int uso4, int uso6) 545 { 546 if (!nc || !nc->info->set_offload) { 547 return; 548 } 549 550 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo, uso4, uso6); 551 } 552 553 int qemu_get_vnet_hdr_len(NetClientState *nc) 554 { 555 if (!nc || !nc->info->get_vnet_hdr_len) { 556 return 0; 557 } 558 559 return nc->info->get_vnet_hdr_len(nc); 560 } 561 562 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 563 { 564 if (!nc || !nc->info->set_vnet_hdr_len) { 565 return; 566 } 567 568 nc->vnet_hdr_len = len; 569 nc->info->set_vnet_hdr_len(nc, len); 570 } 571 572 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 573 { 574 #if HOST_BIG_ENDIAN 575 if (!nc || !nc->info->set_vnet_le) { 576 return -ENOSYS; 577 } 578 579 return nc->info->set_vnet_le(nc, is_le); 580 #else 581 return 0; 582 #endif 583 } 584 585 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 586 { 587 #if HOST_BIG_ENDIAN 588 return 0; 589 #else 590 if (!nc || !nc->info->set_vnet_be) { 591 return -ENOSYS; 592 } 593 594 return nc->info->set_vnet_be(nc, is_be); 595 #endif 596 } 597 598 int qemu_can_receive_packet(NetClientState *nc) 599 { 600 if (nc->receive_disabled) { 601 return 0; 602 } else if (nc->info->can_receive && 603 !nc->info->can_receive(nc)) { 604 return 0; 605 } 606 return 1; 607 } 608 609 int qemu_can_send_packet(NetClientState *sender) 610 { 611 int vm_running = runstate_is_running(); 612 613 if (!vm_running) { 614 return 0; 615 } 616 617 if (!sender->peer) { 618 return 1; 619 } 620 621 return qemu_can_receive_packet(sender->peer); 622 } 623 624 static ssize_t filter_receive_iov(NetClientState *nc, 625 NetFilterDirection direction, 626 NetClientState *sender, 627 unsigned flags, 628 const struct iovec *iov, 629 int iovcnt, 630 NetPacketSent *sent_cb) 631 { 632 ssize_t ret = 0; 633 NetFilterState *nf = NULL; 634 635 if (direction == NET_FILTER_DIRECTION_TX) { 636 QTAILQ_FOREACH(nf, &nc->filters, next) { 637 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 638 iovcnt, sent_cb); 639 if (ret) { 640 return ret; 641 } 642 } 643 } else { 644 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 645 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 646 iovcnt, sent_cb); 647 if (ret) { 648 return ret; 649 } 650 } 651 } 652 653 return ret; 654 } 655 656 static ssize_t filter_receive(NetClientState *nc, 657 NetFilterDirection direction, 658 NetClientState *sender, 659 unsigned flags, 660 const uint8_t *data, 661 size_t size, 662 NetPacketSent *sent_cb) 663 { 664 struct iovec iov = { 665 .iov_base = (void *)data, 666 .iov_len = size 667 }; 668 669 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 670 } 671 672 void qemu_purge_queued_packets(NetClientState *nc) 673 { 674 if (!nc->peer) { 675 return; 676 } 677 678 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 679 } 680 681 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 682 { 683 nc->receive_disabled = 0; 684 685 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 686 if (net_hub_flush(nc->peer)) { 687 qemu_notify_event(); 688 } 689 } 690 if (qemu_net_queue_flush(nc->incoming_queue)) { 691 /* We emptied the queue successfully, signal to the IO thread to repoll 692 * the file descriptor (for tap, for example). 693 */ 694 qemu_notify_event(); 695 } else if (purge) { 696 /* Unable to empty the queue, purge remaining packets */ 697 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 698 } 699 } 700 701 void qemu_flush_queued_packets(NetClientState *nc) 702 { 703 qemu_flush_or_purge_queued_packets(nc, false); 704 } 705 706 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 707 unsigned flags, 708 const uint8_t *buf, int size, 709 NetPacketSent *sent_cb) 710 { 711 NetQueue *queue; 712 int ret; 713 714 #ifdef DEBUG_NET 715 printf("qemu_send_packet_async:\n"); 716 qemu_hexdump(stdout, "net", buf, size); 717 #endif 718 719 if (sender->link_down || !sender->peer) { 720 return size; 721 } 722 723 /* Let filters handle the packet first */ 724 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 725 sender, flags, buf, size, sent_cb); 726 if (ret) { 727 return ret; 728 } 729 730 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 731 sender, flags, buf, size, sent_cb); 732 if (ret) { 733 return ret; 734 } 735 736 queue = sender->peer->incoming_queue; 737 738 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 739 } 740 741 ssize_t qemu_send_packet_async(NetClientState *sender, 742 const uint8_t *buf, int size, 743 NetPacketSent *sent_cb) 744 { 745 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 746 buf, size, sent_cb); 747 } 748 749 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 750 { 751 return qemu_send_packet_async(nc, buf, size, NULL); 752 } 753 754 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 755 { 756 if (!qemu_can_receive_packet(nc)) { 757 return 0; 758 } 759 760 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 761 } 762 763 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 764 int iovcnt) 765 { 766 if (!qemu_can_receive_packet(nc)) { 767 return 0; 768 } 769 770 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 771 } 772 773 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 774 { 775 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 776 buf, size, NULL); 777 } 778 779 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 780 int iovcnt, unsigned flags) 781 { 782 uint8_t *buf = NULL; 783 uint8_t *buffer; 784 size_t offset; 785 ssize_t ret; 786 787 if (iovcnt == 1) { 788 buffer = iov[0].iov_base; 789 offset = iov[0].iov_len; 790 } else { 791 offset = iov_size(iov, iovcnt); 792 if (offset > NET_BUFSIZE) { 793 return -1; 794 } 795 buf = g_malloc(offset); 796 buffer = buf; 797 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 798 } 799 800 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 801 ret = nc->info->receive_raw(nc, buffer, offset); 802 } else { 803 ret = nc->info->receive(nc, buffer, offset); 804 } 805 806 g_free(buf); 807 return ret; 808 } 809 810 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 811 unsigned flags, 812 const struct iovec *iov, 813 int iovcnt, 814 void *opaque) 815 { 816 NetClientState *nc = opaque; 817 int ret; 818 819 820 if (nc->link_down) { 821 return iov_size(iov, iovcnt); 822 } 823 824 if (nc->receive_disabled) { 825 return 0; 826 } 827 828 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 829 ret = nc->info->receive_iov(nc, iov, iovcnt); 830 } else { 831 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 832 } 833 834 if (ret == 0) { 835 nc->receive_disabled = 1; 836 } 837 838 return ret; 839 } 840 841 ssize_t qemu_sendv_packet_async(NetClientState *sender, 842 const struct iovec *iov, int iovcnt, 843 NetPacketSent *sent_cb) 844 { 845 NetQueue *queue; 846 size_t size = iov_size(iov, iovcnt); 847 int ret; 848 849 if (size > NET_BUFSIZE) { 850 return size; 851 } 852 853 if (sender->link_down || !sender->peer) { 854 return size; 855 } 856 857 /* Let filters handle the packet first */ 858 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 859 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 860 if (ret) { 861 return ret; 862 } 863 864 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 865 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 866 if (ret) { 867 return ret; 868 } 869 870 queue = sender->peer->incoming_queue; 871 872 return qemu_net_queue_send_iov(queue, sender, 873 QEMU_NET_PACKET_FLAG_NONE, 874 iov, iovcnt, sent_cb); 875 } 876 877 ssize_t 878 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 879 { 880 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 881 } 882 883 NetClientState *qemu_find_netdev(const char *id) 884 { 885 NetClientState *nc; 886 887 QTAILQ_FOREACH(nc, &net_clients, next) { 888 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 889 continue; 890 if (!strcmp(nc->name, id)) { 891 return nc; 892 } 893 } 894 895 return NULL; 896 } 897 898 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 899 NetClientDriver type, int max) 900 { 901 NetClientState *nc; 902 int ret = 0; 903 904 QTAILQ_FOREACH(nc, &net_clients, next) { 905 if (nc->info->type == type) { 906 continue; 907 } 908 if (!id || !strcmp(nc->name, id)) { 909 if (ret < max) { 910 ncs[ret] = nc; 911 } 912 ret++; 913 } 914 } 915 916 return ret; 917 } 918 919 static int nic_get_free_idx(void) 920 { 921 int index; 922 923 for (index = 0; index < MAX_NICS; index++) 924 if (!nd_table[index].used) 925 return index; 926 return -1; 927 } 928 929 GPtrArray *qemu_get_nic_models(const char *device_type) 930 { 931 GPtrArray *nic_models = g_ptr_array_new(); 932 GSList *list = object_class_get_list_sorted(device_type, false); 933 934 while (list) { 935 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data, 936 TYPE_DEVICE); 937 GSList *next; 938 if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) && 939 dc->user_creatable) { 940 const char *name = object_class_get_name(list->data); 941 /* 942 * A network device might also be something else than a NIC, see 943 * e.g. the "rocker" device. Thus we have to look for the "netdev" 944 * property, too. Unfortunately, some devices like virtio-net only 945 * create this property during instance_init, so we have to create 946 * a temporary instance here to be able to check it. 947 */ 948 Object *obj = object_new_with_class(OBJECT_CLASS(dc)); 949 if (object_property_find(obj, "netdev")) { 950 g_ptr_array_add(nic_models, (gpointer)name); 951 } 952 object_unref(obj); 953 } 954 next = list->next; 955 g_slist_free_1(list); 956 list = next; 957 } 958 g_ptr_array_add(nic_models, NULL); 959 960 return nic_models; 961 } 962 963 int qemu_show_nic_models(const char *arg, const char *const *models) 964 { 965 int i; 966 967 if (!arg || !is_help_option(arg)) { 968 return 0; 969 } 970 971 printf("Available NIC models:\n"); 972 for (i = 0 ; models[i]; i++) { 973 printf("%s\n", models[i]); 974 } 975 return 1; 976 } 977 978 void qemu_check_nic_model(NICInfo *nd, const char *model) 979 { 980 const char *models[2]; 981 982 models[0] = model; 983 models[1] = NULL; 984 985 if (qemu_show_nic_models(nd->model, models)) 986 exit(0); 987 if (qemu_find_nic_model(nd, models, model) < 0) 988 exit(1); 989 } 990 991 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 992 const char *default_model) 993 { 994 int i; 995 996 if (!nd->model) 997 nd->model = g_strdup(default_model); 998 999 for (i = 0 ; models[i]; i++) { 1000 if (strcmp(nd->model, models[i]) == 0) 1001 return i; 1002 } 1003 1004 error_report("Unsupported NIC model: %s", nd->model); 1005 return -1; 1006 } 1007 1008 static int net_init_nic(const Netdev *netdev, const char *name, 1009 NetClientState *peer, Error **errp) 1010 { 1011 int idx; 1012 NICInfo *nd; 1013 const NetLegacyNicOptions *nic; 1014 1015 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 1016 nic = &netdev->u.nic; 1017 1018 idx = nic_get_free_idx(); 1019 if (idx == -1 || nb_nics >= MAX_NICS) { 1020 error_setg(errp, "too many NICs"); 1021 return -1; 1022 } 1023 1024 nd = &nd_table[idx]; 1025 1026 memset(nd, 0, sizeof(*nd)); 1027 1028 if (nic->netdev) { 1029 nd->netdev = qemu_find_netdev(nic->netdev); 1030 if (!nd->netdev) { 1031 error_setg(errp, "netdev '%s' not found", nic->netdev); 1032 return -1; 1033 } 1034 } else { 1035 assert(peer); 1036 nd->netdev = peer; 1037 } 1038 nd->name = g_strdup(name); 1039 if (nic->model) { 1040 nd->model = g_strdup(nic->model); 1041 } 1042 if (nic->addr) { 1043 nd->devaddr = g_strdup(nic->addr); 1044 } 1045 1046 if (nic->macaddr && 1047 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 1048 error_setg(errp, "invalid syntax for ethernet address"); 1049 return -1; 1050 } 1051 if (nic->macaddr && 1052 is_multicast_ether_addr(nd->macaddr.a)) { 1053 error_setg(errp, 1054 "NIC cannot have multicast MAC address (odd 1st byte)"); 1055 return -1; 1056 } 1057 qemu_macaddr_default_if_unset(&nd->macaddr); 1058 1059 if (nic->has_vectors) { 1060 if (nic->vectors > 0x7ffffff) { 1061 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 1062 return -1; 1063 } 1064 nd->nvectors = nic->vectors; 1065 } else { 1066 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 1067 } 1068 1069 nd->used = 1; 1070 nb_nics++; 1071 1072 return idx; 1073 } 1074 1075 1076 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 1077 const Netdev *netdev, 1078 const char *name, 1079 NetClientState *peer, Error **errp) = { 1080 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 1081 #ifdef CONFIG_SLIRP 1082 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1083 #endif 1084 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1085 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1086 [NET_CLIENT_DRIVER_STREAM] = net_init_stream, 1087 [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, 1088 #ifdef CONFIG_VDE 1089 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1090 #endif 1091 #ifdef CONFIG_NETMAP 1092 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1093 #endif 1094 #ifdef CONFIG_AF_XDP 1095 [NET_CLIENT_DRIVER_AF_XDP] = net_init_af_xdp, 1096 #endif 1097 #ifdef CONFIG_NET_BRIDGE 1098 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1099 #endif 1100 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1101 #ifdef CONFIG_VHOST_NET_USER 1102 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1103 #endif 1104 #ifdef CONFIG_VHOST_NET_VDPA 1105 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1106 #endif 1107 #ifdef CONFIG_L2TPV3 1108 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1109 #endif 1110 #ifdef CONFIG_VMNET 1111 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1112 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1113 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1114 #endif /* CONFIG_VMNET */ 1115 }; 1116 1117 1118 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1119 { 1120 NetClientState *peer = NULL; 1121 NetClientState *nc; 1122 1123 if (is_netdev) { 1124 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1125 !net_client_init_fun[netdev->type]) { 1126 error_setg(errp, "network backend '%s' is not compiled into this binary", 1127 NetClientDriver_str(netdev->type)); 1128 return -1; 1129 } 1130 } else { 1131 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1132 return 0; /* nothing to do */ 1133 } 1134 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { 1135 error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", 1136 NetClientDriver_str(netdev->type)); 1137 return -1; 1138 } 1139 1140 if (!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 1146 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1147 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1148 !netdev->u.nic.netdev) { 1149 peer = net_hub_add_port(0, NULL, NULL); 1150 } 1151 } 1152 1153 nc = qemu_find_netdev(netdev->id); 1154 if (nc) { 1155 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1156 return -1; 1157 } 1158 1159 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1160 /* FIXME drop when all init functions store an Error */ 1161 if (errp && !*errp) { 1162 error_setg(errp, "Device '%s' could not be initialized", 1163 NetClientDriver_str(netdev->type)); 1164 } 1165 return -1; 1166 } 1167 1168 if (is_netdev) { 1169 nc = qemu_find_netdev(netdev->id); 1170 assert(nc); 1171 nc->is_netdev = true; 1172 } 1173 1174 return 0; 1175 } 1176 1177 void show_netdevs(void) 1178 { 1179 int idx; 1180 const char *available_netdevs[] = { 1181 "socket", 1182 "stream", 1183 "dgram", 1184 "hubport", 1185 "tap", 1186 #ifdef CONFIG_SLIRP 1187 "user", 1188 #endif 1189 #ifdef CONFIG_L2TPV3 1190 "l2tpv3", 1191 #endif 1192 #ifdef CONFIG_VDE 1193 "vde", 1194 #endif 1195 #ifdef CONFIG_NET_BRIDGE 1196 "bridge", 1197 #endif 1198 #ifdef CONFIG_NETMAP 1199 "netmap", 1200 #endif 1201 #ifdef CONFIG_AF_XDP 1202 "af-xdp", 1203 #endif 1204 #ifdef CONFIG_POSIX 1205 "vhost-user", 1206 #endif 1207 #ifdef CONFIG_VHOST_VDPA 1208 "vhost-vdpa", 1209 #endif 1210 #ifdef CONFIG_VMNET 1211 "vmnet-host", 1212 "vmnet-shared", 1213 "vmnet-bridged", 1214 #endif 1215 }; 1216 1217 qemu_printf("Available netdev backend types:\n"); 1218 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1219 qemu_printf("%s\n", available_netdevs[idx]); 1220 } 1221 } 1222 1223 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1224 { 1225 gchar **substrings = NULL; 1226 Netdev *object = NULL; 1227 int ret = -1; 1228 Visitor *v = opts_visitor_new(opts); 1229 1230 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1231 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1232 1233 if (ip6_net) { 1234 char *prefix_addr; 1235 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1236 1237 substrings = g_strsplit(ip6_net, "/", 2); 1238 if (!substrings || !substrings[0]) { 1239 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1240 "a valid IPv6 prefix"); 1241 goto out; 1242 } 1243 1244 prefix_addr = substrings[0]; 1245 1246 /* Handle user-specified prefix length. */ 1247 if (substrings[1] && 1248 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1249 { 1250 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1251 "ipv6-prefixlen", "a number"); 1252 goto out; 1253 } 1254 1255 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1256 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1257 &error_abort); 1258 qemu_opt_unset(opts, "ipv6-net"); 1259 } 1260 1261 /* Create an ID for -net if the user did not specify one */ 1262 if (!is_netdev && !qemu_opts_id(opts)) { 1263 qemu_opts_set_id(opts, id_generate(ID_NET)); 1264 } 1265 1266 if (visit_type_Netdev(v, NULL, &object, errp)) { 1267 ret = net_client_init1(object, is_netdev, errp); 1268 } 1269 1270 qapi_free_Netdev(object); 1271 1272 out: 1273 g_strfreev(substrings); 1274 visit_free(v); 1275 return ret; 1276 } 1277 1278 void netdev_add(QemuOpts *opts, Error **errp) 1279 { 1280 net_client_init(opts, true, errp); 1281 } 1282 1283 void qmp_netdev_add(Netdev *netdev, Error **errp) 1284 { 1285 if (!id_wellformed(netdev->id)) { 1286 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1287 return; 1288 } 1289 1290 net_client_init1(netdev, true, errp); 1291 } 1292 1293 void qmp_netdev_del(const char *id, Error **errp) 1294 { 1295 NetClientState *nc; 1296 QemuOpts *opts; 1297 1298 nc = qemu_find_netdev(id); 1299 if (!nc) { 1300 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1301 "Device '%s' not found", id); 1302 return; 1303 } 1304 1305 if (!nc->is_netdev) { 1306 error_setg(errp, "Device '%s' is not a netdev", id); 1307 return; 1308 } 1309 1310 qemu_del_net_client(nc); 1311 1312 /* 1313 * Wart: we need to delete the QemuOpts associated with netdevs 1314 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1315 * HMP netdev_add. 1316 */ 1317 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1318 if (opts) { 1319 qemu_opts_del(opts); 1320 } 1321 } 1322 1323 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1324 { 1325 char *str; 1326 ObjectProperty *prop; 1327 ObjectPropertyIterator iter; 1328 Visitor *v; 1329 1330 /* generate info str */ 1331 object_property_iter_init(&iter, OBJECT(nf)); 1332 while ((prop = object_property_iter_next(&iter))) { 1333 if (!strcmp(prop->name, "type")) { 1334 continue; 1335 } 1336 v = string_output_visitor_new(false, &str); 1337 object_property_get(OBJECT(nf), prop->name, v, NULL); 1338 visit_complete(v, &str); 1339 visit_free(v); 1340 monitor_printf(mon, ",%s=%s", prop->name, str); 1341 g_free(str); 1342 } 1343 monitor_printf(mon, "\n"); 1344 } 1345 1346 void print_net_client(Monitor *mon, NetClientState *nc) 1347 { 1348 NetFilterState *nf; 1349 1350 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1351 nc->queue_index, 1352 NetClientDriver_str(nc->info->type), 1353 nc->info_str); 1354 if (!QTAILQ_EMPTY(&nc->filters)) { 1355 monitor_printf(mon, "filters:\n"); 1356 } 1357 QTAILQ_FOREACH(nf, &nc->filters, next) { 1358 monitor_printf(mon, " - %s: type=%s", 1359 object_get_canonical_path_component(OBJECT(nf)), 1360 object_get_typename(OBJECT(nf))); 1361 netfilter_print_info(mon, nf); 1362 } 1363 } 1364 1365 RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp) 1366 { 1367 NetClientState *nc; 1368 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1369 1370 QTAILQ_FOREACH(nc, &net_clients, next) { 1371 RxFilterInfo *info; 1372 1373 if (name && strcmp(nc->name, name) != 0) { 1374 continue; 1375 } 1376 1377 /* only query rx-filter information of NIC */ 1378 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1379 if (name) { 1380 error_setg(errp, "net client(%s) isn't a NIC", name); 1381 assert(!filter_list); 1382 return NULL; 1383 } 1384 continue; 1385 } 1386 1387 /* only query information on queue 0 since the info is per nic, 1388 * not per queue 1389 */ 1390 if (nc->queue_index != 0) 1391 continue; 1392 1393 if (nc->info->query_rx_filter) { 1394 info = nc->info->query_rx_filter(nc); 1395 QAPI_LIST_APPEND(tail, info); 1396 } else if (name) { 1397 error_setg(errp, "net client(%s) doesn't support" 1398 " rx-filter querying", name); 1399 assert(!filter_list); 1400 return NULL; 1401 } 1402 1403 if (name) { 1404 break; 1405 } 1406 } 1407 1408 if (filter_list == NULL && name) { 1409 error_setg(errp, "invalid net client name: %s", name); 1410 } 1411 1412 return filter_list; 1413 } 1414 1415 void colo_notify_filters_event(int event, Error **errp) 1416 { 1417 NetClientState *nc; 1418 NetFilterState *nf; 1419 NetFilterClass *nfc = NULL; 1420 Error *local_err = NULL; 1421 1422 QTAILQ_FOREACH(nc, &net_clients, next) { 1423 QTAILQ_FOREACH(nf, &nc->filters, next) { 1424 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1425 nfc->handle_event(nf, event, &local_err); 1426 if (local_err) { 1427 error_propagate(errp, local_err); 1428 return; 1429 } 1430 } 1431 } 1432 } 1433 1434 void qmp_set_link(const char *name, bool up, Error **errp) 1435 { 1436 NetClientState *ncs[MAX_QUEUE_NUM]; 1437 NetClientState *nc; 1438 int queues, i; 1439 1440 queues = qemu_find_net_clients_except(name, ncs, 1441 NET_CLIENT_DRIVER__MAX, 1442 MAX_QUEUE_NUM); 1443 1444 if (queues == 0) { 1445 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1446 "Device '%s' not found", name); 1447 return; 1448 } 1449 nc = ncs[0]; 1450 1451 for (i = 0; i < queues; i++) { 1452 ncs[i]->link_down = !up; 1453 } 1454 1455 if (nc->info->link_status_changed) { 1456 nc->info->link_status_changed(nc); 1457 } 1458 1459 if (nc->peer) { 1460 /* Change peer link only if the peer is NIC and then notify peer. 1461 * If the peer is a HUBPORT or a backend, we do not change the 1462 * link status. 1463 * 1464 * This behavior is compatible with qemu hubs where there could be 1465 * multiple clients that can still communicate with each other in 1466 * disconnected mode. For now maintain this compatibility. 1467 */ 1468 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1469 for (i = 0; i < queues; i++) { 1470 ncs[i]->peer->link_down = !up; 1471 } 1472 } 1473 if (nc->peer->info->link_status_changed) { 1474 nc->peer->info->link_status_changed(nc->peer); 1475 } 1476 } 1477 } 1478 1479 static void net_vm_change_state_handler(void *opaque, bool running, 1480 RunState state) 1481 { 1482 NetClientState *nc; 1483 NetClientState *tmp; 1484 1485 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1486 if (running) { 1487 /* Flush queued packets and wake up backends. */ 1488 if (nc->peer && qemu_can_send_packet(nc)) { 1489 qemu_flush_queued_packets(nc->peer); 1490 } 1491 } else { 1492 /* Complete all queued packets, to guarantee we don't modify 1493 * state later when VM is not running. 1494 */ 1495 qemu_flush_or_purge_queued_packets(nc, true); 1496 } 1497 } 1498 } 1499 1500 void net_cleanup(void) 1501 { 1502 NetClientState *nc; 1503 1504 /*cleanup colo compare module for COLO*/ 1505 colo_compare_cleanup(); 1506 1507 /* We may del multiple entries during qemu_del_net_client(), 1508 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1509 */ 1510 while (!QTAILQ_EMPTY(&net_clients)) { 1511 nc = QTAILQ_FIRST(&net_clients); 1512 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1513 qemu_del_nic(qemu_get_nic(nc)); 1514 } else { 1515 qemu_del_net_client(nc); 1516 } 1517 } 1518 1519 qemu_del_vm_change_state_handler(net_change_state_entry); 1520 } 1521 1522 void net_check_clients(void) 1523 { 1524 NetClientState *nc; 1525 int i; 1526 1527 net_hub_check_clients(); 1528 1529 QTAILQ_FOREACH(nc, &net_clients, next) { 1530 if (!nc->peer) { 1531 warn_report("%s %s has no peer", 1532 nc->info->type == NET_CLIENT_DRIVER_NIC 1533 ? "nic" : "netdev", 1534 nc->name); 1535 } 1536 } 1537 1538 /* Check that all NICs requested via -net nic actually got created. 1539 * NICs created via -device don't need to be checked here because 1540 * they are always instantiated. 1541 */ 1542 for (i = 0; i < MAX_NICS; i++) { 1543 NICInfo *nd = &nd_table[i]; 1544 if (nd->used && !nd->instantiated) { 1545 warn_report("requested NIC (%s, model %s) " 1546 "was not created (not supported by this machine?)", 1547 nd->name ? nd->name : "anonymous", 1548 nd->model ? nd->model : "unspecified"); 1549 } 1550 } 1551 } 1552 1553 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1554 { 1555 return net_client_init(opts, false, errp); 1556 } 1557 1558 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1559 { 1560 const char *type = qemu_opt_get(opts, "type"); 1561 1562 if (type && is_help_option(type)) { 1563 show_netdevs(); 1564 exit(0); 1565 } 1566 return net_client_init(opts, true, errp); 1567 } 1568 1569 /* For the convenience "--nic" parameter */ 1570 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1571 { 1572 char *mac, *nd_id; 1573 int idx, ret; 1574 NICInfo *ni; 1575 const char *type; 1576 1577 type = qemu_opt_get(opts, "type"); 1578 if (type) { 1579 if (g_str_equal(type, "none")) { 1580 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1581 } 1582 if (is_help_option(type)) { 1583 GPtrArray *nic_models = qemu_get_nic_models(TYPE_DEVICE); 1584 show_netdevs(); 1585 printf("\n"); 1586 qemu_show_nic_models(type, (const char **)nic_models->pdata); 1587 g_ptr_array_free(nic_models, true); 1588 exit(0); 1589 } 1590 } 1591 1592 idx = nic_get_free_idx(); 1593 if (idx == -1 || nb_nics >= MAX_NICS) { 1594 error_setg(errp, "no more on-board/default NIC slots available"); 1595 return -1; 1596 } 1597 1598 if (!type) { 1599 qemu_opt_set(opts, "type", "user", &error_abort); 1600 } 1601 1602 ni = &nd_table[idx]; 1603 memset(ni, 0, sizeof(*ni)); 1604 ni->model = qemu_opt_get_del(opts, "model"); 1605 1606 /* Create an ID if the user did not specify one */ 1607 nd_id = g_strdup(qemu_opts_id(opts)); 1608 if (!nd_id) { 1609 nd_id = id_generate(ID_NET); 1610 qemu_opts_set_id(opts, nd_id); 1611 } 1612 1613 /* Handle MAC address */ 1614 mac = qemu_opt_get_del(opts, "mac"); 1615 if (mac) { 1616 ret = net_parse_macaddr(ni->macaddr.a, mac); 1617 g_free(mac); 1618 if (ret) { 1619 error_setg(errp, "invalid syntax for ethernet address"); 1620 goto out; 1621 } 1622 if (is_multicast_ether_addr(ni->macaddr.a)) { 1623 error_setg(errp, "NIC cannot have multicast MAC address"); 1624 ret = -1; 1625 goto out; 1626 } 1627 } 1628 qemu_macaddr_default_if_unset(&ni->macaddr); 1629 1630 ret = net_client_init(opts, true, errp); 1631 if (ret == 0) { 1632 ni->netdev = qemu_find_netdev(nd_id); 1633 ni->used = true; 1634 nb_nics++; 1635 } 1636 1637 out: 1638 g_free(nd_id); 1639 return ret; 1640 } 1641 1642 static void netdev_init_modern(void) 1643 { 1644 while (!QSIMPLEQ_EMPTY(&nd_queue)) { 1645 NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); 1646 1647 QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); 1648 loc_push_restore(&nd->loc); 1649 net_client_init1(nd->nd, true, &error_fatal); 1650 loc_pop(&nd->loc); 1651 qapi_free_Netdev(nd->nd); 1652 g_free(nd); 1653 } 1654 } 1655 1656 void net_init_clients(void) 1657 { 1658 net_change_state_entry = 1659 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1660 1661 QTAILQ_INIT(&net_clients); 1662 1663 netdev_init_modern(); 1664 1665 qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1666 &error_fatal); 1667 1668 qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, 1669 &error_fatal); 1670 1671 qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, 1672 &error_fatal); 1673 } 1674 1675 /* 1676 * Does this -netdev argument use modern rather than traditional syntax? 1677 * Modern syntax is to be parsed with netdev_parse_modern(). 1678 * Traditional syntax is to be parsed with net_client_parse(). 1679 */ 1680 bool netdev_is_modern(const char *optarg) 1681 { 1682 QemuOpts *opts; 1683 bool is_modern; 1684 const char *type; 1685 static QemuOptsList dummy_opts = { 1686 .name = "netdev", 1687 .implied_opt_name = "type", 1688 .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), 1689 .desc = { { } }, 1690 }; 1691 1692 if (optarg[0] == '{') { 1693 /* This is JSON, which means it's modern syntax */ 1694 return true; 1695 } 1696 1697 opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); 1698 qemu_opts_do_parse(opts, optarg, dummy_opts.implied_opt_name, 1699 &error_abort); 1700 type = qemu_opt_get(opts, "type"); 1701 is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); 1702 1703 qemu_opts_reset(&dummy_opts); 1704 1705 return is_modern; 1706 } 1707 1708 /* 1709 * netdev_parse_modern() uses modern, more expressive syntax than 1710 * net_client_parse(), but supports only the -netdev option. 1711 * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() 1712 * appends to @qemu_netdev_opts. 1713 */ 1714 void netdev_parse_modern(const char *optarg) 1715 { 1716 Visitor *v; 1717 NetdevQueueEntry *nd; 1718 1719 v = qobject_input_visitor_new_str(optarg, "type", &error_fatal); 1720 nd = g_new(NetdevQueueEntry, 1); 1721 visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); 1722 visit_free(v); 1723 loc_save(&nd->loc); 1724 1725 QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); 1726 } 1727 1728 void net_client_parse(QemuOptsList *opts_list, const char *optarg) 1729 { 1730 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1731 exit(1); 1732 } 1733 } 1734 1735 /* From FreeBSD */ 1736 /* XXX: optimize */ 1737 uint32_t net_crc32(const uint8_t *p, int len) 1738 { 1739 uint32_t crc; 1740 int carry, i, j; 1741 uint8_t b; 1742 1743 crc = 0xffffffff; 1744 for (i = 0; i < len; i++) { 1745 b = *p++; 1746 for (j = 0; j < 8; j++) { 1747 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1748 crc <<= 1; 1749 b >>= 1; 1750 if (carry) { 1751 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1752 } 1753 } 1754 } 1755 1756 return crc; 1757 } 1758 1759 uint32_t net_crc32_le(const uint8_t *p, int len) 1760 { 1761 uint32_t crc; 1762 int carry, i, j; 1763 uint8_t b; 1764 1765 crc = 0xffffffff; 1766 for (i = 0; i < len; i++) { 1767 b = *p++; 1768 for (j = 0; j < 8; j++) { 1769 carry = (crc & 0x1) ^ (b & 0x01); 1770 crc >>= 1; 1771 b >>= 1; 1772 if (carry) { 1773 crc ^= POLYNOMIAL_LE; 1774 } 1775 } 1776 } 1777 1778 return crc; 1779 } 1780 1781 QemuOptsList qemu_netdev_opts = { 1782 .name = "netdev", 1783 .implied_opt_name = "type", 1784 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1785 .desc = { 1786 /* 1787 * no elements => accept any params 1788 * validation will happen later 1789 */ 1790 { /* end of list */ } 1791 }, 1792 }; 1793 1794 QemuOptsList qemu_nic_opts = { 1795 .name = "nic", 1796 .implied_opt_name = "type", 1797 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1798 .desc = { 1799 /* 1800 * no elements => accept any params 1801 * validation will happen later 1802 */ 1803 { /* end of list */ } 1804 }, 1805 }; 1806 1807 QemuOptsList qemu_net_opts = { 1808 .name = "net", 1809 .implied_opt_name = "type", 1810 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1811 .desc = { 1812 /* 1813 * no elements => accept any params 1814 * validation will happen later 1815 */ 1816 { /* end of list */ } 1817 }, 1818 }; 1819 1820 void net_socket_rs_init(SocketReadState *rs, 1821 SocketReadStateFinalize *finalize, 1822 bool vnet_hdr) 1823 { 1824 rs->state = 0; 1825 rs->vnet_hdr = vnet_hdr; 1826 rs->index = 0; 1827 rs->packet_len = 0; 1828 rs->vnet_hdr_len = 0; 1829 memset(rs->buf, 0, sizeof(rs->buf)); 1830 rs->finalize = finalize; 1831 } 1832 1833 /* 1834 * Returns 1835 * 0: success 1836 * -1: error occurs 1837 */ 1838 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1839 { 1840 unsigned int l; 1841 1842 while (size > 0) { 1843 /* Reassemble a packet from the network. 1844 * 0 = getting length. 1845 * 1 = getting vnet header length. 1846 * 2 = getting data. 1847 */ 1848 switch (rs->state) { 1849 case 0: 1850 l = 4 - rs->index; 1851 if (l > size) { 1852 l = size; 1853 } 1854 memcpy(rs->buf + rs->index, buf, l); 1855 buf += l; 1856 size -= l; 1857 rs->index += l; 1858 if (rs->index == 4) { 1859 /* got length */ 1860 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1861 rs->index = 0; 1862 if (rs->vnet_hdr) { 1863 rs->state = 1; 1864 } else { 1865 rs->state = 2; 1866 rs->vnet_hdr_len = 0; 1867 } 1868 } 1869 break; 1870 case 1: 1871 l = 4 - rs->index; 1872 if (l > size) { 1873 l = size; 1874 } 1875 memcpy(rs->buf + rs->index, buf, l); 1876 buf += l; 1877 size -= l; 1878 rs->index += l; 1879 if (rs->index == 4) { 1880 /* got vnet header length */ 1881 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1882 rs->index = 0; 1883 rs->state = 2; 1884 } 1885 break; 1886 case 2: 1887 l = rs->packet_len - rs->index; 1888 if (l > size) { 1889 l = size; 1890 } 1891 if (rs->index + l <= sizeof(rs->buf)) { 1892 memcpy(rs->buf + rs->index, buf, l); 1893 } else { 1894 fprintf(stderr, "serious error: oversized packet received," 1895 "connection terminated.\n"); 1896 rs->index = rs->state = 0; 1897 return -1; 1898 } 1899 1900 rs->index += l; 1901 buf += l; 1902 size -= l; 1903 if (rs->index >= rs->packet_len) { 1904 rs->index = 0; 1905 rs->state = 0; 1906 assert(rs->finalize); 1907 rs->finalize(rs); 1908 } 1909 break; 1910 } 1911 } 1912 1913 assert(size == 0); 1914 return 0; 1915 } 1916