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_vnet_hdr(NetClientState *nc) 499 { 500 if (!nc || !nc->info->has_vnet_hdr) { 501 return false; 502 } 503 504 return nc->info->has_vnet_hdr(nc); 505 } 506 507 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 508 { 509 if (!nc || !nc->info->has_vnet_hdr_len) { 510 return false; 511 } 512 513 return nc->info->has_vnet_hdr_len(nc, len); 514 } 515 516 bool qemu_get_using_vnet_hdr(NetClientState *nc) 517 { 518 if (!nc || !nc->info->get_using_vnet_hdr) { 519 return false; 520 } 521 522 return nc->info->get_using_vnet_hdr(nc); 523 } 524 525 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 526 { 527 if (!nc || !nc->info->using_vnet_hdr) { 528 return; 529 } 530 531 nc->info->using_vnet_hdr(nc, enable); 532 } 533 534 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 535 int ecn, int ufo, int uso4, int uso6) 536 { 537 if (!nc || !nc->info->set_offload) { 538 return; 539 } 540 541 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo, uso4, uso6); 542 } 543 544 int qemu_get_vnet_hdr_len(NetClientState *nc) 545 { 546 if (!nc || !nc->info->get_vnet_hdr_len) { 547 return 0; 548 } 549 550 return nc->info->get_vnet_hdr_len(nc); 551 } 552 553 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 554 { 555 if (!nc || !nc->info->set_vnet_hdr_len) { 556 return; 557 } 558 559 nc->vnet_hdr_len = len; 560 nc->info->set_vnet_hdr_len(nc, len); 561 } 562 563 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 564 { 565 #if HOST_BIG_ENDIAN 566 if (!nc || !nc->info->set_vnet_le) { 567 return -ENOSYS; 568 } 569 570 return nc->info->set_vnet_le(nc, is_le); 571 #else 572 return 0; 573 #endif 574 } 575 576 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 577 { 578 #if HOST_BIG_ENDIAN 579 return 0; 580 #else 581 if (!nc || !nc->info->set_vnet_be) { 582 return -ENOSYS; 583 } 584 585 return nc->info->set_vnet_be(nc, is_be); 586 #endif 587 } 588 589 int qemu_can_receive_packet(NetClientState *nc) 590 { 591 if (nc->receive_disabled) { 592 return 0; 593 } else if (nc->info->can_receive && 594 !nc->info->can_receive(nc)) { 595 return 0; 596 } 597 return 1; 598 } 599 600 int qemu_can_send_packet(NetClientState *sender) 601 { 602 int vm_running = runstate_is_running(); 603 604 if (!vm_running) { 605 return 0; 606 } 607 608 if (!sender->peer) { 609 return 1; 610 } 611 612 return qemu_can_receive_packet(sender->peer); 613 } 614 615 static ssize_t filter_receive_iov(NetClientState *nc, 616 NetFilterDirection direction, 617 NetClientState *sender, 618 unsigned flags, 619 const struct iovec *iov, 620 int iovcnt, 621 NetPacketSent *sent_cb) 622 { 623 ssize_t ret = 0; 624 NetFilterState *nf = NULL; 625 626 if (direction == NET_FILTER_DIRECTION_TX) { 627 QTAILQ_FOREACH(nf, &nc->filters, next) { 628 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 629 iovcnt, sent_cb); 630 if (ret) { 631 return ret; 632 } 633 } 634 } else { 635 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 636 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 637 iovcnt, sent_cb); 638 if (ret) { 639 return ret; 640 } 641 } 642 } 643 644 return ret; 645 } 646 647 static ssize_t filter_receive(NetClientState *nc, 648 NetFilterDirection direction, 649 NetClientState *sender, 650 unsigned flags, 651 const uint8_t *data, 652 size_t size, 653 NetPacketSent *sent_cb) 654 { 655 struct iovec iov = { 656 .iov_base = (void *)data, 657 .iov_len = size 658 }; 659 660 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 661 } 662 663 void qemu_purge_queued_packets(NetClientState *nc) 664 { 665 if (!nc->peer) { 666 return; 667 } 668 669 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 670 } 671 672 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 673 { 674 nc->receive_disabled = 0; 675 676 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 677 if (net_hub_flush(nc->peer)) { 678 qemu_notify_event(); 679 } 680 } 681 if (qemu_net_queue_flush(nc->incoming_queue)) { 682 /* We emptied the queue successfully, signal to the IO thread to repoll 683 * the file descriptor (for tap, for example). 684 */ 685 qemu_notify_event(); 686 } else if (purge) { 687 /* Unable to empty the queue, purge remaining packets */ 688 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 689 } 690 } 691 692 void qemu_flush_queued_packets(NetClientState *nc) 693 { 694 qemu_flush_or_purge_queued_packets(nc, false); 695 } 696 697 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 698 unsigned flags, 699 const uint8_t *buf, int size, 700 NetPacketSent *sent_cb) 701 { 702 NetQueue *queue; 703 int ret; 704 705 #ifdef DEBUG_NET 706 printf("qemu_send_packet_async:\n"); 707 qemu_hexdump(stdout, "net", buf, size); 708 #endif 709 710 if (sender->link_down || !sender->peer) { 711 return size; 712 } 713 714 /* Let filters handle the packet first */ 715 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 716 sender, flags, buf, size, sent_cb); 717 if (ret) { 718 return ret; 719 } 720 721 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 722 sender, flags, buf, size, sent_cb); 723 if (ret) { 724 return ret; 725 } 726 727 queue = sender->peer->incoming_queue; 728 729 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 730 } 731 732 ssize_t qemu_send_packet_async(NetClientState *sender, 733 const uint8_t *buf, int size, 734 NetPacketSent *sent_cb) 735 { 736 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 737 buf, size, sent_cb); 738 } 739 740 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 741 { 742 return qemu_send_packet_async(nc, buf, size, NULL); 743 } 744 745 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 746 { 747 if (!qemu_can_receive_packet(nc)) { 748 return 0; 749 } 750 751 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 752 } 753 754 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 755 int iovcnt) 756 { 757 if (!qemu_can_receive_packet(nc)) { 758 return 0; 759 } 760 761 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 762 } 763 764 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 765 { 766 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 767 buf, size, NULL); 768 } 769 770 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 771 int iovcnt, unsigned flags) 772 { 773 uint8_t *buf = NULL; 774 uint8_t *buffer; 775 size_t offset; 776 ssize_t ret; 777 778 if (iovcnt == 1) { 779 buffer = iov[0].iov_base; 780 offset = iov[0].iov_len; 781 } else { 782 offset = iov_size(iov, iovcnt); 783 if (offset > NET_BUFSIZE) { 784 return -1; 785 } 786 buf = g_malloc(offset); 787 buffer = buf; 788 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 789 } 790 791 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 792 ret = nc->info->receive_raw(nc, buffer, offset); 793 } else { 794 ret = nc->info->receive(nc, buffer, offset); 795 } 796 797 g_free(buf); 798 return ret; 799 } 800 801 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 802 unsigned flags, 803 const struct iovec *iov, 804 int iovcnt, 805 void *opaque) 806 { 807 NetClientState *nc = opaque; 808 int ret; 809 810 811 if (nc->link_down) { 812 return iov_size(iov, iovcnt); 813 } 814 815 if (nc->receive_disabled) { 816 return 0; 817 } 818 819 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 820 ret = nc->info->receive_iov(nc, iov, iovcnt); 821 } else { 822 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 823 } 824 825 if (ret == 0) { 826 nc->receive_disabled = 1; 827 } 828 829 return ret; 830 } 831 832 ssize_t qemu_sendv_packet_async(NetClientState *sender, 833 const struct iovec *iov, int iovcnt, 834 NetPacketSent *sent_cb) 835 { 836 NetQueue *queue; 837 size_t size = iov_size(iov, iovcnt); 838 int ret; 839 840 if (size > NET_BUFSIZE) { 841 return size; 842 } 843 844 if (sender->link_down || !sender->peer) { 845 return size; 846 } 847 848 /* Let filters handle the packet first */ 849 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 850 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 851 if (ret) { 852 return ret; 853 } 854 855 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 856 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 857 if (ret) { 858 return ret; 859 } 860 861 queue = sender->peer->incoming_queue; 862 863 return qemu_net_queue_send_iov(queue, sender, 864 QEMU_NET_PACKET_FLAG_NONE, 865 iov, iovcnt, sent_cb); 866 } 867 868 ssize_t 869 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 870 { 871 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 872 } 873 874 NetClientState *qemu_find_netdev(const char *id) 875 { 876 NetClientState *nc; 877 878 QTAILQ_FOREACH(nc, &net_clients, next) { 879 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 880 continue; 881 if (!strcmp(nc->name, id)) { 882 return nc; 883 } 884 } 885 886 return NULL; 887 } 888 889 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 890 NetClientDriver type, int max) 891 { 892 NetClientState *nc; 893 int ret = 0; 894 895 QTAILQ_FOREACH(nc, &net_clients, next) { 896 if (nc->info->type == type) { 897 continue; 898 } 899 if (!id || !strcmp(nc->name, id)) { 900 if (ret < max) { 901 ncs[ret] = nc; 902 } 903 ret++; 904 } 905 } 906 907 return ret; 908 } 909 910 static int nic_get_free_idx(void) 911 { 912 int index; 913 914 for (index = 0; index < MAX_NICS; index++) 915 if (!nd_table[index].used) 916 return index; 917 return -1; 918 } 919 920 GPtrArray *qemu_get_nic_models(const char *device_type) 921 { 922 GPtrArray *nic_models = g_ptr_array_new(); 923 GSList *list = object_class_get_list_sorted(device_type, false); 924 925 while (list) { 926 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data, 927 TYPE_DEVICE); 928 GSList *next; 929 if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) && 930 dc->user_creatable) { 931 const char *name = object_class_get_name(list->data); 932 /* 933 * A network device might also be something else than a NIC, see 934 * e.g. the "rocker" device. Thus we have to look for the "netdev" 935 * property, too. Unfortunately, some devices like virtio-net only 936 * create this property during instance_init, so we have to create 937 * a temporary instance here to be able to check it. 938 */ 939 Object *obj = object_new_with_class(OBJECT_CLASS(dc)); 940 if (object_property_find(obj, "netdev")) { 941 g_ptr_array_add(nic_models, (gpointer)name); 942 } 943 object_unref(obj); 944 } 945 next = list->next; 946 g_slist_free_1(list); 947 list = next; 948 } 949 g_ptr_array_add(nic_models, NULL); 950 951 return nic_models; 952 } 953 954 int qemu_show_nic_models(const char *arg, const char *const *models) 955 { 956 int i; 957 958 if (!arg || !is_help_option(arg)) { 959 return 0; 960 } 961 962 printf("Available NIC models:\n"); 963 for (i = 0 ; models[i]; i++) { 964 printf("%s\n", models[i]); 965 } 966 return 1; 967 } 968 969 void qemu_check_nic_model(NICInfo *nd, const char *model) 970 { 971 const char *models[2]; 972 973 models[0] = model; 974 models[1] = NULL; 975 976 if (qemu_show_nic_models(nd->model, models)) 977 exit(0); 978 if (qemu_find_nic_model(nd, models, model) < 0) 979 exit(1); 980 } 981 982 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 983 const char *default_model) 984 { 985 int i; 986 987 if (!nd->model) 988 nd->model = g_strdup(default_model); 989 990 for (i = 0 ; models[i]; i++) { 991 if (strcmp(nd->model, models[i]) == 0) 992 return i; 993 } 994 995 error_report("Unsupported NIC model: %s", nd->model); 996 return -1; 997 } 998 999 static int net_init_nic(const Netdev *netdev, const char *name, 1000 NetClientState *peer, Error **errp) 1001 { 1002 int idx; 1003 NICInfo *nd; 1004 const NetLegacyNicOptions *nic; 1005 1006 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 1007 nic = &netdev->u.nic; 1008 1009 idx = nic_get_free_idx(); 1010 if (idx == -1 || nb_nics >= MAX_NICS) { 1011 error_setg(errp, "too many NICs"); 1012 return -1; 1013 } 1014 1015 nd = &nd_table[idx]; 1016 1017 memset(nd, 0, sizeof(*nd)); 1018 1019 if (nic->netdev) { 1020 nd->netdev = qemu_find_netdev(nic->netdev); 1021 if (!nd->netdev) { 1022 error_setg(errp, "netdev '%s' not found", nic->netdev); 1023 return -1; 1024 } 1025 } else { 1026 assert(peer); 1027 nd->netdev = peer; 1028 } 1029 nd->name = g_strdup(name); 1030 if (nic->model) { 1031 nd->model = g_strdup(nic->model); 1032 } 1033 if (nic->addr) { 1034 nd->devaddr = g_strdup(nic->addr); 1035 } 1036 1037 if (nic->macaddr && 1038 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 1039 error_setg(errp, "invalid syntax for ethernet address"); 1040 return -1; 1041 } 1042 if (nic->macaddr && 1043 is_multicast_ether_addr(nd->macaddr.a)) { 1044 error_setg(errp, 1045 "NIC cannot have multicast MAC address (odd 1st byte)"); 1046 return -1; 1047 } 1048 qemu_macaddr_default_if_unset(&nd->macaddr); 1049 1050 if (nic->has_vectors) { 1051 if (nic->vectors > 0x7ffffff) { 1052 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 1053 return -1; 1054 } 1055 nd->nvectors = nic->vectors; 1056 } else { 1057 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 1058 } 1059 1060 nd->used = 1; 1061 nb_nics++; 1062 1063 return idx; 1064 } 1065 1066 1067 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 1068 const Netdev *netdev, 1069 const char *name, 1070 NetClientState *peer, Error **errp) = { 1071 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 1072 #ifdef CONFIG_SLIRP 1073 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1074 #endif 1075 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1076 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1077 [NET_CLIENT_DRIVER_STREAM] = net_init_stream, 1078 [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, 1079 #ifdef CONFIG_VDE 1080 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1081 #endif 1082 #ifdef CONFIG_NETMAP 1083 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1084 #endif 1085 #ifdef CONFIG_NET_BRIDGE 1086 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1087 #endif 1088 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1089 #ifdef CONFIG_VHOST_NET_USER 1090 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1091 #endif 1092 #ifdef CONFIG_VHOST_NET_VDPA 1093 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1094 #endif 1095 #ifdef CONFIG_L2TPV3 1096 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1097 #endif 1098 #ifdef CONFIG_VMNET 1099 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1100 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1101 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1102 #endif /* CONFIG_VMNET */ 1103 }; 1104 1105 1106 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1107 { 1108 NetClientState *peer = NULL; 1109 NetClientState *nc; 1110 1111 if (is_netdev) { 1112 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1113 !net_client_init_fun[netdev->type]) { 1114 error_setg(errp, "network backend '%s' is not compiled into this binary", 1115 NetClientDriver_str(netdev->type)); 1116 return -1; 1117 } 1118 } else { 1119 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1120 return 0; /* nothing to do */ 1121 } 1122 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { 1123 error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", 1124 NetClientDriver_str(netdev->type)); 1125 return -1; 1126 } 1127 1128 if (!net_client_init_fun[netdev->type]) { 1129 error_setg(errp, "network backend '%s' is not compiled into this binary", 1130 NetClientDriver_str(netdev->type)); 1131 return -1; 1132 } 1133 1134 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1135 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1136 !netdev->u.nic.netdev) { 1137 peer = net_hub_add_port(0, NULL, NULL); 1138 } 1139 } 1140 1141 nc = qemu_find_netdev(netdev->id); 1142 if (nc) { 1143 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1144 return -1; 1145 } 1146 1147 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1148 /* FIXME drop when all init functions store an Error */ 1149 if (errp && !*errp) { 1150 error_setg(errp, "Device '%s' could not be initialized", 1151 NetClientDriver_str(netdev->type)); 1152 } 1153 return -1; 1154 } 1155 1156 if (is_netdev) { 1157 nc = qemu_find_netdev(netdev->id); 1158 assert(nc); 1159 nc->is_netdev = true; 1160 } 1161 1162 return 0; 1163 } 1164 1165 void show_netdevs(void) 1166 { 1167 int idx; 1168 const char *available_netdevs[] = { 1169 "socket", 1170 "stream", 1171 "dgram", 1172 "hubport", 1173 "tap", 1174 #ifdef CONFIG_SLIRP 1175 "user", 1176 #endif 1177 #ifdef CONFIG_L2TPV3 1178 "l2tpv3", 1179 #endif 1180 #ifdef CONFIG_VDE 1181 "vde", 1182 #endif 1183 #ifdef CONFIG_NET_BRIDGE 1184 "bridge", 1185 #endif 1186 #ifdef CONFIG_NETMAP 1187 "netmap", 1188 #endif 1189 #ifdef CONFIG_POSIX 1190 "vhost-user", 1191 #endif 1192 #ifdef CONFIG_VHOST_VDPA 1193 "vhost-vdpa", 1194 #endif 1195 #ifdef CONFIG_VMNET 1196 "vmnet-host", 1197 "vmnet-shared", 1198 "vmnet-bridged", 1199 #endif 1200 }; 1201 1202 qemu_printf("Available netdev backend types:\n"); 1203 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1204 qemu_printf("%s\n", available_netdevs[idx]); 1205 } 1206 } 1207 1208 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1209 { 1210 gchar **substrings = NULL; 1211 Netdev *object = NULL; 1212 int ret = -1; 1213 Visitor *v = opts_visitor_new(opts); 1214 1215 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1216 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1217 1218 if (ip6_net) { 1219 char *prefix_addr; 1220 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1221 1222 substrings = g_strsplit(ip6_net, "/", 2); 1223 if (!substrings || !substrings[0]) { 1224 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1225 "a valid IPv6 prefix"); 1226 goto out; 1227 } 1228 1229 prefix_addr = substrings[0]; 1230 1231 /* Handle user-specified prefix length. */ 1232 if (substrings[1] && 1233 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1234 { 1235 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1236 "ipv6-prefixlen", "a number"); 1237 goto out; 1238 } 1239 1240 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1241 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1242 &error_abort); 1243 qemu_opt_unset(opts, "ipv6-net"); 1244 } 1245 1246 /* Create an ID for -net if the user did not specify one */ 1247 if (!is_netdev && !qemu_opts_id(opts)) { 1248 qemu_opts_set_id(opts, id_generate(ID_NET)); 1249 } 1250 1251 if (visit_type_Netdev(v, NULL, &object, errp)) { 1252 ret = net_client_init1(object, is_netdev, errp); 1253 } 1254 1255 qapi_free_Netdev(object); 1256 1257 out: 1258 g_strfreev(substrings); 1259 visit_free(v); 1260 return ret; 1261 } 1262 1263 void netdev_add(QemuOpts *opts, Error **errp) 1264 { 1265 net_client_init(opts, true, errp); 1266 } 1267 1268 void qmp_netdev_add(Netdev *netdev, Error **errp) 1269 { 1270 if (!id_wellformed(netdev->id)) { 1271 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1272 return; 1273 } 1274 1275 net_client_init1(netdev, true, errp); 1276 } 1277 1278 void qmp_netdev_del(const char *id, Error **errp) 1279 { 1280 NetClientState *nc; 1281 QemuOpts *opts; 1282 1283 nc = qemu_find_netdev(id); 1284 if (!nc) { 1285 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1286 "Device '%s' not found", id); 1287 return; 1288 } 1289 1290 if (!nc->is_netdev) { 1291 error_setg(errp, "Device '%s' is not a netdev", id); 1292 return; 1293 } 1294 1295 qemu_del_net_client(nc); 1296 1297 /* 1298 * Wart: we need to delete the QemuOpts associated with netdevs 1299 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1300 * HMP netdev_add. 1301 */ 1302 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1303 if (opts) { 1304 qemu_opts_del(opts); 1305 } 1306 } 1307 1308 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1309 { 1310 char *str; 1311 ObjectProperty *prop; 1312 ObjectPropertyIterator iter; 1313 Visitor *v; 1314 1315 /* generate info str */ 1316 object_property_iter_init(&iter, OBJECT(nf)); 1317 while ((prop = object_property_iter_next(&iter))) { 1318 if (!strcmp(prop->name, "type")) { 1319 continue; 1320 } 1321 v = string_output_visitor_new(false, &str); 1322 object_property_get(OBJECT(nf), prop->name, v, NULL); 1323 visit_complete(v, &str); 1324 visit_free(v); 1325 monitor_printf(mon, ",%s=%s", prop->name, str); 1326 g_free(str); 1327 } 1328 monitor_printf(mon, "\n"); 1329 } 1330 1331 void print_net_client(Monitor *mon, NetClientState *nc) 1332 { 1333 NetFilterState *nf; 1334 1335 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1336 nc->queue_index, 1337 NetClientDriver_str(nc->info->type), 1338 nc->info_str); 1339 if (!QTAILQ_EMPTY(&nc->filters)) { 1340 monitor_printf(mon, "filters:\n"); 1341 } 1342 QTAILQ_FOREACH(nf, &nc->filters, next) { 1343 monitor_printf(mon, " - %s: type=%s", 1344 object_get_canonical_path_component(OBJECT(nf)), 1345 object_get_typename(OBJECT(nf))); 1346 netfilter_print_info(mon, nf); 1347 } 1348 } 1349 1350 RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp) 1351 { 1352 NetClientState *nc; 1353 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1354 1355 QTAILQ_FOREACH(nc, &net_clients, next) { 1356 RxFilterInfo *info; 1357 1358 if (name && strcmp(nc->name, name) != 0) { 1359 continue; 1360 } 1361 1362 /* only query rx-filter information of NIC */ 1363 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1364 if (name) { 1365 error_setg(errp, "net client(%s) isn't a NIC", name); 1366 assert(!filter_list); 1367 return NULL; 1368 } 1369 continue; 1370 } 1371 1372 /* only query information on queue 0 since the info is per nic, 1373 * not per queue 1374 */ 1375 if (nc->queue_index != 0) 1376 continue; 1377 1378 if (nc->info->query_rx_filter) { 1379 info = nc->info->query_rx_filter(nc); 1380 QAPI_LIST_APPEND(tail, info); 1381 } else if (name) { 1382 error_setg(errp, "net client(%s) doesn't support" 1383 " rx-filter querying", name); 1384 assert(!filter_list); 1385 return NULL; 1386 } 1387 1388 if (name) { 1389 break; 1390 } 1391 } 1392 1393 if (filter_list == NULL && name) { 1394 error_setg(errp, "invalid net client name: %s", name); 1395 } 1396 1397 return filter_list; 1398 } 1399 1400 void colo_notify_filters_event(int event, Error **errp) 1401 { 1402 NetClientState *nc; 1403 NetFilterState *nf; 1404 NetFilterClass *nfc = NULL; 1405 Error *local_err = NULL; 1406 1407 QTAILQ_FOREACH(nc, &net_clients, next) { 1408 QTAILQ_FOREACH(nf, &nc->filters, next) { 1409 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1410 nfc->handle_event(nf, event, &local_err); 1411 if (local_err) { 1412 error_propagate(errp, local_err); 1413 return; 1414 } 1415 } 1416 } 1417 } 1418 1419 void qmp_set_link(const char *name, bool up, Error **errp) 1420 { 1421 NetClientState *ncs[MAX_QUEUE_NUM]; 1422 NetClientState *nc; 1423 int queues, i; 1424 1425 queues = qemu_find_net_clients_except(name, ncs, 1426 NET_CLIENT_DRIVER__MAX, 1427 MAX_QUEUE_NUM); 1428 1429 if (queues == 0) { 1430 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1431 "Device '%s' not found", name); 1432 return; 1433 } 1434 nc = ncs[0]; 1435 1436 for (i = 0; i < queues; i++) { 1437 ncs[i]->link_down = !up; 1438 } 1439 1440 if (nc->info->link_status_changed) { 1441 nc->info->link_status_changed(nc); 1442 } 1443 1444 if (nc->peer) { 1445 /* Change peer link only if the peer is NIC and then notify peer. 1446 * If the peer is a HUBPORT or a backend, we do not change the 1447 * link status. 1448 * 1449 * This behavior is compatible with qemu hubs where there could be 1450 * multiple clients that can still communicate with each other in 1451 * disconnected mode. For now maintain this compatibility. 1452 */ 1453 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1454 for (i = 0; i < queues; i++) { 1455 ncs[i]->peer->link_down = !up; 1456 } 1457 } 1458 if (nc->peer->info->link_status_changed) { 1459 nc->peer->info->link_status_changed(nc->peer); 1460 } 1461 } 1462 } 1463 1464 static void net_vm_change_state_handler(void *opaque, bool running, 1465 RunState state) 1466 { 1467 NetClientState *nc; 1468 NetClientState *tmp; 1469 1470 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1471 if (running) { 1472 /* Flush queued packets and wake up backends. */ 1473 if (nc->peer && qemu_can_send_packet(nc)) { 1474 qemu_flush_queued_packets(nc->peer); 1475 } 1476 } else { 1477 /* Complete all queued packets, to guarantee we don't modify 1478 * state later when VM is not running. 1479 */ 1480 qemu_flush_or_purge_queued_packets(nc, true); 1481 } 1482 } 1483 } 1484 1485 void net_cleanup(void) 1486 { 1487 NetClientState *nc; 1488 1489 /*cleanup colo compare module for COLO*/ 1490 colo_compare_cleanup(); 1491 1492 /* We may del multiple entries during qemu_del_net_client(), 1493 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1494 */ 1495 while (!QTAILQ_EMPTY(&net_clients)) { 1496 nc = QTAILQ_FIRST(&net_clients); 1497 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1498 qemu_del_nic(qemu_get_nic(nc)); 1499 } else { 1500 qemu_del_net_client(nc); 1501 } 1502 } 1503 1504 qemu_del_vm_change_state_handler(net_change_state_entry); 1505 } 1506 1507 void net_check_clients(void) 1508 { 1509 NetClientState *nc; 1510 int i; 1511 1512 net_hub_check_clients(); 1513 1514 QTAILQ_FOREACH(nc, &net_clients, next) { 1515 if (!nc->peer) { 1516 warn_report("%s %s has no peer", 1517 nc->info->type == NET_CLIENT_DRIVER_NIC 1518 ? "nic" : "netdev", 1519 nc->name); 1520 } 1521 } 1522 1523 /* Check that all NICs requested via -net nic actually got created. 1524 * NICs created via -device don't need to be checked here because 1525 * they are always instantiated. 1526 */ 1527 for (i = 0; i < MAX_NICS; i++) { 1528 NICInfo *nd = &nd_table[i]; 1529 if (nd->used && !nd->instantiated) { 1530 warn_report("requested NIC (%s, model %s) " 1531 "was not created (not supported by this machine?)", 1532 nd->name ? nd->name : "anonymous", 1533 nd->model ? nd->model : "unspecified"); 1534 } 1535 } 1536 } 1537 1538 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1539 { 1540 return net_client_init(opts, false, errp); 1541 } 1542 1543 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1544 { 1545 const char *type = qemu_opt_get(opts, "type"); 1546 1547 if (type && is_help_option(type)) { 1548 show_netdevs(); 1549 exit(0); 1550 } 1551 return net_client_init(opts, true, errp); 1552 } 1553 1554 /* For the convenience "--nic" parameter */ 1555 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1556 { 1557 char *mac, *nd_id; 1558 int idx, ret; 1559 NICInfo *ni; 1560 const char *type; 1561 1562 type = qemu_opt_get(opts, "type"); 1563 if (type) { 1564 if (g_str_equal(type, "none")) { 1565 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1566 } 1567 if (is_help_option(type)) { 1568 GPtrArray *nic_models = qemu_get_nic_models(TYPE_DEVICE); 1569 show_netdevs(); 1570 printf("\n"); 1571 qemu_show_nic_models(type, (const char **)nic_models->pdata); 1572 g_ptr_array_free(nic_models, true); 1573 exit(0); 1574 } 1575 } 1576 1577 idx = nic_get_free_idx(); 1578 if (idx == -1 || nb_nics >= MAX_NICS) { 1579 error_setg(errp, "no more on-board/default NIC slots available"); 1580 return -1; 1581 } 1582 1583 if (!type) { 1584 qemu_opt_set(opts, "type", "user", &error_abort); 1585 } 1586 1587 ni = &nd_table[idx]; 1588 memset(ni, 0, sizeof(*ni)); 1589 ni->model = qemu_opt_get_del(opts, "model"); 1590 1591 /* Create an ID if the user did not specify one */ 1592 nd_id = g_strdup(qemu_opts_id(opts)); 1593 if (!nd_id) { 1594 nd_id = id_generate(ID_NET); 1595 qemu_opts_set_id(opts, nd_id); 1596 } 1597 1598 /* Handle MAC address */ 1599 mac = qemu_opt_get_del(opts, "mac"); 1600 if (mac) { 1601 ret = net_parse_macaddr(ni->macaddr.a, mac); 1602 g_free(mac); 1603 if (ret) { 1604 error_setg(errp, "invalid syntax for ethernet address"); 1605 goto out; 1606 } 1607 if (is_multicast_ether_addr(ni->macaddr.a)) { 1608 error_setg(errp, "NIC cannot have multicast MAC address"); 1609 ret = -1; 1610 goto out; 1611 } 1612 } 1613 qemu_macaddr_default_if_unset(&ni->macaddr); 1614 1615 ret = net_client_init(opts, true, errp); 1616 if (ret == 0) { 1617 ni->netdev = qemu_find_netdev(nd_id); 1618 ni->used = true; 1619 nb_nics++; 1620 } 1621 1622 out: 1623 g_free(nd_id); 1624 return ret; 1625 } 1626 1627 static void netdev_init_modern(void) 1628 { 1629 while (!QSIMPLEQ_EMPTY(&nd_queue)) { 1630 NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); 1631 1632 QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); 1633 loc_push_restore(&nd->loc); 1634 net_client_init1(nd->nd, true, &error_fatal); 1635 loc_pop(&nd->loc); 1636 qapi_free_Netdev(nd->nd); 1637 g_free(nd); 1638 } 1639 } 1640 1641 void net_init_clients(void) 1642 { 1643 net_change_state_entry = 1644 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1645 1646 QTAILQ_INIT(&net_clients); 1647 1648 netdev_init_modern(); 1649 1650 qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1651 &error_fatal); 1652 1653 qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, 1654 &error_fatal); 1655 1656 qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, 1657 &error_fatal); 1658 } 1659 1660 /* 1661 * Does this -netdev argument use modern rather than traditional syntax? 1662 * Modern syntax is to be parsed with netdev_parse_modern(). 1663 * Traditional syntax is to be parsed with net_client_parse(). 1664 */ 1665 bool netdev_is_modern(const char *optarg) 1666 { 1667 QemuOpts *opts; 1668 bool is_modern; 1669 const char *type; 1670 static QemuOptsList dummy_opts = { 1671 .name = "netdev", 1672 .implied_opt_name = "type", 1673 .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), 1674 .desc = { { } }, 1675 }; 1676 1677 if (optarg[0] == '{') { 1678 /* This is JSON, which means it's modern syntax */ 1679 return true; 1680 } 1681 1682 opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); 1683 qemu_opts_do_parse(opts, optarg, dummy_opts.implied_opt_name, 1684 &error_abort); 1685 type = qemu_opt_get(opts, "type"); 1686 is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); 1687 1688 qemu_opts_reset(&dummy_opts); 1689 1690 return is_modern; 1691 } 1692 1693 /* 1694 * netdev_parse_modern() uses modern, more expressive syntax than 1695 * net_client_parse(), but supports only the -netdev option. 1696 * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() 1697 * appends to @qemu_netdev_opts. 1698 */ 1699 void netdev_parse_modern(const char *optarg) 1700 { 1701 Visitor *v; 1702 NetdevQueueEntry *nd; 1703 1704 v = qobject_input_visitor_new_str(optarg, "type", &error_fatal); 1705 nd = g_new(NetdevQueueEntry, 1); 1706 visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); 1707 visit_free(v); 1708 loc_save(&nd->loc); 1709 1710 QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); 1711 } 1712 1713 void net_client_parse(QemuOptsList *opts_list, const char *optarg) 1714 { 1715 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1716 exit(1); 1717 } 1718 } 1719 1720 /* From FreeBSD */ 1721 /* XXX: optimize */ 1722 uint32_t net_crc32(const uint8_t *p, int len) 1723 { 1724 uint32_t crc; 1725 int carry, i, j; 1726 uint8_t b; 1727 1728 crc = 0xffffffff; 1729 for (i = 0; i < len; i++) { 1730 b = *p++; 1731 for (j = 0; j < 8; j++) { 1732 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1733 crc <<= 1; 1734 b >>= 1; 1735 if (carry) { 1736 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1737 } 1738 } 1739 } 1740 1741 return crc; 1742 } 1743 1744 uint32_t net_crc32_le(const uint8_t *p, int len) 1745 { 1746 uint32_t crc; 1747 int carry, i, j; 1748 uint8_t b; 1749 1750 crc = 0xffffffff; 1751 for (i = 0; i < len; i++) { 1752 b = *p++; 1753 for (j = 0; j < 8; j++) { 1754 carry = (crc & 0x1) ^ (b & 0x01); 1755 crc >>= 1; 1756 b >>= 1; 1757 if (carry) { 1758 crc ^= POLYNOMIAL_LE; 1759 } 1760 } 1761 } 1762 1763 return crc; 1764 } 1765 1766 QemuOptsList qemu_netdev_opts = { 1767 .name = "netdev", 1768 .implied_opt_name = "type", 1769 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1770 .desc = { 1771 /* 1772 * no elements => accept any params 1773 * validation will happen later 1774 */ 1775 { /* end of list */ } 1776 }, 1777 }; 1778 1779 QemuOptsList qemu_nic_opts = { 1780 .name = "nic", 1781 .implied_opt_name = "type", 1782 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1783 .desc = { 1784 /* 1785 * no elements => accept any params 1786 * validation will happen later 1787 */ 1788 { /* end of list */ } 1789 }, 1790 }; 1791 1792 QemuOptsList qemu_net_opts = { 1793 .name = "net", 1794 .implied_opt_name = "type", 1795 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1796 .desc = { 1797 /* 1798 * no elements => accept any params 1799 * validation will happen later 1800 */ 1801 { /* end of list */ } 1802 }, 1803 }; 1804 1805 void net_socket_rs_init(SocketReadState *rs, 1806 SocketReadStateFinalize *finalize, 1807 bool vnet_hdr) 1808 { 1809 rs->state = 0; 1810 rs->vnet_hdr = vnet_hdr; 1811 rs->index = 0; 1812 rs->packet_len = 0; 1813 rs->vnet_hdr_len = 0; 1814 memset(rs->buf, 0, sizeof(rs->buf)); 1815 rs->finalize = finalize; 1816 } 1817 1818 /* 1819 * Returns 1820 * 0: success 1821 * -1: error occurs 1822 */ 1823 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1824 { 1825 unsigned int l; 1826 1827 while (size > 0) { 1828 /* Reassemble a packet from the network. 1829 * 0 = getting length. 1830 * 1 = getting vnet header length. 1831 * 2 = getting data. 1832 */ 1833 switch (rs->state) { 1834 case 0: 1835 l = 4 - rs->index; 1836 if (l > size) { 1837 l = size; 1838 } 1839 memcpy(rs->buf + rs->index, buf, l); 1840 buf += l; 1841 size -= l; 1842 rs->index += l; 1843 if (rs->index == 4) { 1844 /* got length */ 1845 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1846 rs->index = 0; 1847 if (rs->vnet_hdr) { 1848 rs->state = 1; 1849 } else { 1850 rs->state = 2; 1851 rs->vnet_hdr_len = 0; 1852 } 1853 } 1854 break; 1855 case 1: 1856 l = 4 - rs->index; 1857 if (l > size) { 1858 l = size; 1859 } 1860 memcpy(rs->buf + rs->index, buf, l); 1861 buf += l; 1862 size -= l; 1863 rs->index += l; 1864 if (rs->index == 4) { 1865 /* got vnet header length */ 1866 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1867 rs->index = 0; 1868 rs->state = 2; 1869 } 1870 break; 1871 case 2: 1872 l = rs->packet_len - rs->index; 1873 if (l > size) { 1874 l = size; 1875 } 1876 if (rs->index + l <= sizeof(rs->buf)) { 1877 memcpy(rs->buf + rs->index, buf, l); 1878 } else { 1879 fprintf(stderr, "serious error: oversized packet received," 1880 "connection terminated.\n"); 1881 rs->index = rs->state = 0; 1882 return -1; 1883 } 1884 1885 rs->index += l; 1886 buf += l; 1887 size -= l; 1888 if (rs->index >= rs->packet_len) { 1889 rs->index = 0; 1890 rs->state = 0; 1891 assert(rs->finalize); 1892 rs->finalize(rs); 1893 } 1894 break; 1895 } 1896 } 1897 1898 assert(size == 0); 1899 return 0; 1900 } 1901