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