net.c (49473B)
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 static QTAILQ_HEAD(, NetClientState) 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 int qemu_show_nic_models(const char *arg, const char *const *models) 903 { 904 int i; 905 906 if (!arg || !is_help_option(arg)) { 907 return 0; 908 } 909 910 printf("Supported NIC models:\n"); 911 for (i = 0 ; models[i]; i++) { 912 printf("%s\n", models[i]); 913 } 914 return 1; 915 } 916 917 void qemu_check_nic_model(NICInfo *nd, const char *model) 918 { 919 const char *models[2]; 920 921 models[0] = model; 922 models[1] = NULL; 923 924 if (qemu_show_nic_models(nd->model, models)) 925 exit(0); 926 if (qemu_find_nic_model(nd, models, model) < 0) 927 exit(1); 928 } 929 930 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 931 const char *default_model) 932 { 933 int i; 934 935 if (!nd->model) 936 nd->model = g_strdup(default_model); 937 938 for (i = 0 ; models[i]; i++) { 939 if (strcmp(nd->model, models[i]) == 0) 940 return i; 941 } 942 943 error_report("Unsupported NIC model: %s", nd->model); 944 return -1; 945 } 946 947 static int net_init_nic(const Netdev *netdev, const char *name, 948 NetClientState *peer, Error **errp) 949 { 950 int idx; 951 NICInfo *nd; 952 const NetLegacyNicOptions *nic; 953 954 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 955 nic = &netdev->u.nic; 956 957 idx = nic_get_free_idx(); 958 if (idx == -1 || nb_nics >= MAX_NICS) { 959 error_setg(errp, "too many NICs"); 960 return -1; 961 } 962 963 nd = &nd_table[idx]; 964 965 memset(nd, 0, sizeof(*nd)); 966 967 if (nic->has_netdev) { 968 nd->netdev = qemu_find_netdev(nic->netdev); 969 if (!nd->netdev) { 970 error_setg(errp, "netdev '%s' not found", nic->netdev); 971 return -1; 972 } 973 } else { 974 assert(peer); 975 nd->netdev = peer; 976 } 977 nd->name = g_strdup(name); 978 if (nic->has_model) { 979 nd->model = g_strdup(nic->model); 980 } 981 if (nic->has_addr) { 982 nd->devaddr = g_strdup(nic->addr); 983 } 984 985 if (nic->has_macaddr && 986 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 987 error_setg(errp, "invalid syntax for ethernet address"); 988 return -1; 989 } 990 if (nic->has_macaddr && 991 is_multicast_ether_addr(nd->macaddr.a)) { 992 error_setg(errp, 993 "NIC cannot have multicast MAC address (odd 1st byte)"); 994 return -1; 995 } 996 qemu_macaddr_default_if_unset(&nd->macaddr); 997 998 if (nic->has_vectors) { 999 if (nic->vectors > 0x7ffffff) { 1000 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 1001 return -1; 1002 } 1003 nd->nvectors = nic->vectors; 1004 } else { 1005 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 1006 } 1007 1008 nd->used = 1; 1009 nb_nics++; 1010 1011 return idx; 1012 } 1013 1014 1015 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 1016 const Netdev *netdev, 1017 const char *name, 1018 NetClientState *peer, Error **errp) = { 1019 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 1020 #ifdef CONFIG_SLIRP 1021 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1022 #endif 1023 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1024 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1025 [NET_CLIENT_DRIVER_STREAM] = net_init_stream, 1026 [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, 1027 #ifdef CONFIG_VDE 1028 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1029 #endif 1030 #ifdef CONFIG_NETMAP 1031 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1032 #endif 1033 #ifdef CONFIG_NET_BRIDGE 1034 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1035 #endif 1036 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1037 #ifdef CONFIG_VHOST_NET_USER 1038 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1039 #endif 1040 #ifdef CONFIG_VHOST_NET_VDPA 1041 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1042 #endif 1043 #ifdef CONFIG_L2TPV3 1044 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1045 #endif 1046 #ifdef CONFIG_VMNET 1047 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1048 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1049 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1050 #endif /* CONFIG_VMNET */ 1051 }; 1052 1053 1054 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1055 { 1056 NetClientState *peer = NULL; 1057 NetClientState *nc; 1058 1059 if (is_netdev) { 1060 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1061 !net_client_init_fun[netdev->type]) { 1062 error_setg(errp, "network backend '%s' is not compiled into this binary", 1063 NetClientDriver_str(netdev->type)); 1064 return -1; 1065 } 1066 } else { 1067 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1068 return 0; /* nothing to do */ 1069 } 1070 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { 1071 error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", 1072 NetClientDriver_str(netdev->type)); 1073 return -1; 1074 } 1075 1076 if (!net_client_init_fun[netdev->type]) { 1077 error_setg(errp, "network backend '%s' is not compiled into this binary", 1078 NetClientDriver_str(netdev->type)); 1079 return -1; 1080 } 1081 1082 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1083 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1084 !netdev->u.nic.has_netdev) { 1085 peer = net_hub_add_port(0, NULL, NULL); 1086 } 1087 } 1088 1089 nc = qemu_find_netdev(netdev->id); 1090 if (nc) { 1091 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1092 return -1; 1093 } 1094 1095 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1096 /* FIXME drop when all init functions store an Error */ 1097 if (errp && !*errp) { 1098 error_setg(errp, "Device '%s' could not be initialized", 1099 NetClientDriver_str(netdev->type)); 1100 } 1101 return -1; 1102 } 1103 1104 if (is_netdev) { 1105 nc = qemu_find_netdev(netdev->id); 1106 assert(nc); 1107 nc->is_netdev = true; 1108 } 1109 1110 return 0; 1111 } 1112 1113 void show_netdevs(void) 1114 { 1115 int idx; 1116 const char *available_netdevs[] = { 1117 "socket", 1118 "stream", 1119 "dgram", 1120 "hubport", 1121 "tap", 1122 #ifdef CONFIG_SLIRP 1123 "user", 1124 #endif 1125 #ifdef CONFIG_L2TPV3 1126 "l2tpv3", 1127 #endif 1128 #ifdef CONFIG_VDE 1129 "vde", 1130 #endif 1131 #ifdef CONFIG_NET_BRIDGE 1132 "bridge", 1133 #endif 1134 #ifdef CONFIG_NETMAP 1135 "netmap", 1136 #endif 1137 #ifdef CONFIG_POSIX 1138 "vhost-user", 1139 #endif 1140 #ifdef CONFIG_VHOST_VDPA 1141 "vhost-vdpa", 1142 #endif 1143 #ifdef CONFIG_VMNET 1144 "vmnet-host", 1145 "vmnet-shared", 1146 "vmnet-bridged", 1147 #endif 1148 }; 1149 1150 qemu_printf("Available netdev backend types:\n"); 1151 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1152 qemu_printf("%s\n", available_netdevs[idx]); 1153 } 1154 } 1155 1156 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1157 { 1158 gchar **substrings = NULL; 1159 Netdev *object = NULL; 1160 int ret = -1; 1161 Visitor *v = opts_visitor_new(opts); 1162 1163 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1164 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1165 1166 if (ip6_net) { 1167 char *prefix_addr; 1168 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1169 1170 substrings = g_strsplit(ip6_net, "/", 2); 1171 if (!substrings || !substrings[0]) { 1172 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1173 "a valid IPv6 prefix"); 1174 goto out; 1175 } 1176 1177 prefix_addr = substrings[0]; 1178 1179 /* Handle user-specified prefix length. */ 1180 if (substrings[1] && 1181 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1182 { 1183 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1184 "ipv6-prefixlen", "a number"); 1185 goto out; 1186 } 1187 1188 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1189 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1190 &error_abort); 1191 qemu_opt_unset(opts, "ipv6-net"); 1192 } 1193 1194 /* Create an ID for -net if the user did not specify one */ 1195 if (!is_netdev && !qemu_opts_id(opts)) { 1196 qemu_opts_set_id(opts, id_generate(ID_NET)); 1197 } 1198 1199 if (visit_type_Netdev(v, NULL, &object, errp)) { 1200 ret = net_client_init1(object, is_netdev, errp); 1201 } 1202 1203 qapi_free_Netdev(object); 1204 1205 out: 1206 g_strfreev(substrings); 1207 visit_free(v); 1208 return ret; 1209 } 1210 1211 void netdev_add(QemuOpts *opts, Error **errp) 1212 { 1213 net_client_init(opts, true, errp); 1214 } 1215 1216 void qmp_netdev_add(Netdev *netdev, Error **errp) 1217 { 1218 if (!id_wellformed(netdev->id)) { 1219 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1220 return; 1221 } 1222 1223 net_client_init1(netdev, true, errp); 1224 } 1225 1226 void qmp_netdev_del(const char *id, Error **errp) 1227 { 1228 NetClientState *nc; 1229 QemuOpts *opts; 1230 1231 nc = qemu_find_netdev(id); 1232 if (!nc) { 1233 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1234 "Device '%s' not found", id); 1235 return; 1236 } 1237 1238 if (!nc->is_netdev) { 1239 error_setg(errp, "Device '%s' is not a netdev", id); 1240 return; 1241 } 1242 1243 qemu_del_net_client(nc); 1244 1245 /* 1246 * Wart: we need to delete the QemuOpts associated with netdevs 1247 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1248 * HMP netdev_add. 1249 */ 1250 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1251 if (opts) { 1252 qemu_opts_del(opts); 1253 } 1254 } 1255 1256 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1257 { 1258 char *str; 1259 ObjectProperty *prop; 1260 ObjectPropertyIterator iter; 1261 Visitor *v; 1262 1263 /* generate info str */ 1264 object_property_iter_init(&iter, OBJECT(nf)); 1265 while ((prop = object_property_iter_next(&iter))) { 1266 if (!strcmp(prop->name, "type")) { 1267 continue; 1268 } 1269 v = string_output_visitor_new(false, &str); 1270 object_property_get(OBJECT(nf), prop->name, v, NULL); 1271 visit_complete(v, &str); 1272 visit_free(v); 1273 monitor_printf(mon, ",%s=%s", prop->name, str); 1274 g_free(str); 1275 } 1276 monitor_printf(mon, "\n"); 1277 } 1278 1279 void print_net_client(Monitor *mon, NetClientState *nc) 1280 { 1281 NetFilterState *nf; 1282 1283 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1284 nc->queue_index, 1285 NetClientDriver_str(nc->info->type), 1286 nc->info_str); 1287 if (!QTAILQ_EMPTY(&nc->filters)) { 1288 monitor_printf(mon, "filters:\n"); 1289 } 1290 QTAILQ_FOREACH(nf, &nc->filters, next) { 1291 monitor_printf(mon, " - %s: type=%s", 1292 object_get_canonical_path_component(OBJECT(nf)), 1293 object_get_typename(OBJECT(nf))); 1294 netfilter_print_info(mon, nf); 1295 } 1296 } 1297 1298 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1299 Error **errp) 1300 { 1301 NetClientState *nc; 1302 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1303 1304 QTAILQ_FOREACH(nc, &net_clients, next) { 1305 RxFilterInfo *info; 1306 1307 if (has_name && strcmp(nc->name, name) != 0) { 1308 continue; 1309 } 1310 1311 /* only query rx-filter information of NIC */ 1312 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1313 if (has_name) { 1314 error_setg(errp, "net client(%s) isn't a NIC", name); 1315 assert(!filter_list); 1316 return NULL; 1317 } 1318 continue; 1319 } 1320 1321 /* only query information on queue 0 since the info is per nic, 1322 * not per queue 1323 */ 1324 if (nc->queue_index != 0) 1325 continue; 1326 1327 if (nc->info->query_rx_filter) { 1328 info = nc->info->query_rx_filter(nc); 1329 QAPI_LIST_APPEND(tail, info); 1330 } else if (has_name) { 1331 error_setg(errp, "net client(%s) doesn't support" 1332 " rx-filter querying", name); 1333 assert(!filter_list); 1334 return NULL; 1335 } 1336 1337 if (has_name) { 1338 break; 1339 } 1340 } 1341 1342 if (filter_list == NULL && has_name) { 1343 error_setg(errp, "invalid net client name: %s", name); 1344 } 1345 1346 return filter_list; 1347 } 1348 1349 void hmp_info_network(Monitor *mon, const QDict *qdict) 1350 { 1351 NetClientState *nc, *peer; 1352 NetClientDriver type; 1353 1354 net_hub_info(mon); 1355 1356 QTAILQ_FOREACH(nc, &net_clients, next) { 1357 peer = nc->peer; 1358 type = nc->info->type; 1359 1360 /* Skip if already printed in hub info */ 1361 if (net_hub_id_for_client(nc, NULL) == 0) { 1362 continue; 1363 } 1364 1365 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1366 print_net_client(mon, nc); 1367 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1368 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1369 monitor_printf(mon, " \\ "); 1370 print_net_client(mon, peer); 1371 } 1372 } 1373 } 1374 1375 void colo_notify_filters_event(int event, Error **errp) 1376 { 1377 NetClientState *nc; 1378 NetFilterState *nf; 1379 NetFilterClass *nfc = NULL; 1380 Error *local_err = NULL; 1381 1382 QTAILQ_FOREACH(nc, &net_clients, next) { 1383 QTAILQ_FOREACH(nf, &nc->filters, next) { 1384 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1385 nfc->handle_event(nf, event, &local_err); 1386 if (local_err) { 1387 error_propagate(errp, local_err); 1388 return; 1389 } 1390 } 1391 } 1392 } 1393 1394 void qmp_set_link(const char *name, bool up, Error **errp) 1395 { 1396 NetClientState *ncs[MAX_QUEUE_NUM]; 1397 NetClientState *nc; 1398 int queues, i; 1399 1400 queues = qemu_find_net_clients_except(name, ncs, 1401 NET_CLIENT_DRIVER__MAX, 1402 MAX_QUEUE_NUM); 1403 1404 if (queues == 0) { 1405 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1406 "Device '%s' not found", name); 1407 return; 1408 } 1409 nc = ncs[0]; 1410 1411 for (i = 0; i < queues; i++) { 1412 ncs[i]->link_down = !up; 1413 } 1414 1415 if (nc->info->link_status_changed) { 1416 nc->info->link_status_changed(nc); 1417 } 1418 1419 if (nc->peer) { 1420 /* Change peer link only if the peer is NIC and then notify peer. 1421 * If the peer is a HUBPORT or a backend, we do not change the 1422 * link status. 1423 * 1424 * This behavior is compatible with qemu hubs where there could be 1425 * multiple clients that can still communicate with each other in 1426 * disconnected mode. For now maintain this compatibility. 1427 */ 1428 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1429 for (i = 0; i < queues; i++) { 1430 ncs[i]->peer->link_down = !up; 1431 } 1432 } 1433 if (nc->peer->info->link_status_changed) { 1434 nc->peer->info->link_status_changed(nc->peer); 1435 } 1436 } 1437 } 1438 1439 static void net_vm_change_state_handler(void *opaque, bool running, 1440 RunState state) 1441 { 1442 NetClientState *nc; 1443 NetClientState *tmp; 1444 1445 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1446 if (running) { 1447 /* Flush queued packets and wake up backends. */ 1448 if (nc->peer && qemu_can_send_packet(nc)) { 1449 qemu_flush_queued_packets(nc->peer); 1450 } 1451 } else { 1452 /* Complete all queued packets, to guarantee we don't modify 1453 * state later when VM is not running. 1454 */ 1455 qemu_flush_or_purge_queued_packets(nc, true); 1456 } 1457 } 1458 } 1459 1460 void net_cleanup(void) 1461 { 1462 NetClientState *nc; 1463 1464 /*cleanup colo compare module for COLO*/ 1465 colo_compare_cleanup(); 1466 1467 /* We may del multiple entries during qemu_del_net_client(), 1468 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1469 */ 1470 while (!QTAILQ_EMPTY(&net_clients)) { 1471 nc = QTAILQ_FIRST(&net_clients); 1472 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1473 qemu_del_nic(qemu_get_nic(nc)); 1474 } else { 1475 qemu_del_net_client(nc); 1476 } 1477 } 1478 1479 qemu_del_vm_change_state_handler(net_change_state_entry); 1480 } 1481 1482 void net_check_clients(void) 1483 { 1484 NetClientState *nc; 1485 int i; 1486 1487 net_hub_check_clients(); 1488 1489 QTAILQ_FOREACH(nc, &net_clients, next) { 1490 if (!nc->peer) { 1491 warn_report("%s %s has no peer", 1492 nc->info->type == NET_CLIENT_DRIVER_NIC 1493 ? "nic" : "netdev", 1494 nc->name); 1495 } 1496 } 1497 1498 /* Check that all NICs requested via -net nic actually got created. 1499 * NICs created via -device don't need to be checked here because 1500 * they are always instantiated. 1501 */ 1502 for (i = 0; i < MAX_NICS; i++) { 1503 NICInfo *nd = &nd_table[i]; 1504 if (nd->used && !nd->instantiated) { 1505 warn_report("requested NIC (%s, model %s) " 1506 "was not created (not supported by this machine?)", 1507 nd->name ? nd->name : "anonymous", 1508 nd->model ? nd->model : "unspecified"); 1509 } 1510 } 1511 } 1512 1513 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1514 { 1515 return net_client_init(opts, false, errp); 1516 } 1517 1518 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1519 { 1520 const char *type = qemu_opt_get(opts, "type"); 1521 1522 if (type && is_help_option(type)) { 1523 show_netdevs(); 1524 exit(0); 1525 } 1526 return net_client_init(opts, true, errp); 1527 } 1528 1529 /* For the convenience "--nic" parameter */ 1530 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1531 { 1532 char *mac, *nd_id; 1533 int idx, ret; 1534 NICInfo *ni; 1535 const char *type; 1536 1537 type = qemu_opt_get(opts, "type"); 1538 if (type && g_str_equal(type, "none")) { 1539 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1540 } 1541 1542 idx = nic_get_free_idx(); 1543 if (idx == -1 || nb_nics >= MAX_NICS) { 1544 error_setg(errp, "no more on-board/default NIC slots available"); 1545 return -1; 1546 } 1547 1548 if (!type) { 1549 qemu_opt_set(opts, "type", "user", &error_abort); 1550 } 1551 1552 ni = &nd_table[idx]; 1553 memset(ni, 0, sizeof(*ni)); 1554 ni->model = qemu_opt_get_del(opts, "model"); 1555 1556 /* Create an ID if the user did not specify one */ 1557 nd_id = g_strdup(qemu_opts_id(opts)); 1558 if (!nd_id) { 1559 nd_id = id_generate(ID_NET); 1560 qemu_opts_set_id(opts, nd_id); 1561 } 1562 1563 /* Handle MAC address */ 1564 mac = qemu_opt_get_del(opts, "mac"); 1565 if (mac) { 1566 ret = net_parse_macaddr(ni->macaddr.a, mac); 1567 g_free(mac); 1568 if (ret) { 1569 error_setg(errp, "invalid syntax for ethernet address"); 1570 goto out; 1571 } 1572 if (is_multicast_ether_addr(ni->macaddr.a)) { 1573 error_setg(errp, "NIC cannot have multicast MAC address"); 1574 ret = -1; 1575 goto out; 1576 } 1577 } 1578 qemu_macaddr_default_if_unset(&ni->macaddr); 1579 1580 ret = net_client_init(opts, true, errp); 1581 if (ret == 0) { 1582 ni->netdev = qemu_find_netdev(nd_id); 1583 ni->used = true; 1584 nb_nics++; 1585 } 1586 1587 out: 1588 g_free(nd_id); 1589 return ret; 1590 } 1591 1592 static void netdev_init_modern(void) 1593 { 1594 while (!QSIMPLEQ_EMPTY(&nd_queue)) { 1595 NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); 1596 1597 QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); 1598 loc_push_restore(&nd->loc); 1599 net_client_init1(nd->nd, true, &error_fatal); 1600 loc_pop(&nd->loc); 1601 qapi_free_Netdev(nd->nd); 1602 g_free(nd); 1603 } 1604 } 1605 1606 void net_init_clients(void) 1607 { 1608 net_change_state_entry = 1609 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1610 1611 QTAILQ_INIT(&net_clients); 1612 1613 netdev_init_modern(); 1614 1615 qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1616 &error_fatal); 1617 1618 qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, 1619 &error_fatal); 1620 1621 qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, 1622 &error_fatal); 1623 } 1624 1625 /* 1626 * Does this -netdev argument use modern rather than traditional syntax? 1627 * Modern syntax is to be parsed with netdev_parse_modern(). 1628 * Traditional syntax is to be parsed with net_client_parse(). 1629 */ 1630 bool netdev_is_modern(const char *optarg) 1631 { 1632 QemuOpts *opts; 1633 bool is_modern; 1634 const char *type; 1635 static QemuOptsList dummy_opts = { 1636 .name = "netdev", 1637 .implied_opt_name = "type", 1638 .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), 1639 .desc = { { } }, 1640 }; 1641 1642 if (optarg[0] == '{') { 1643 /* This is JSON, which means it's modern syntax */ 1644 return true; 1645 } 1646 1647 opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); 1648 qemu_opts_do_parse(opts, optarg, dummy_opts.implied_opt_name, 1649 &error_abort); 1650 type = qemu_opt_get(opts, "type"); 1651 is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); 1652 1653 qemu_opts_reset(&dummy_opts); 1654 1655 return is_modern; 1656 } 1657 1658 /* 1659 * netdev_parse_modern() uses modern, more expressive syntax than 1660 * net_client_parse(), but supports only the -netdev option. 1661 * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() 1662 * appends to @qemu_netdev_opts. 1663 */ 1664 void netdev_parse_modern(const char *optarg) 1665 { 1666 Visitor *v; 1667 NetdevQueueEntry *nd; 1668 1669 v = qobject_input_visitor_new_str(optarg, "type", &error_fatal); 1670 nd = g_new(NetdevQueueEntry, 1); 1671 visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); 1672 visit_free(v); 1673 loc_save(&nd->loc); 1674 1675 QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); 1676 } 1677 1678 void net_client_parse(QemuOptsList *opts_list, const char *optarg) 1679 { 1680 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1681 exit(1); 1682 } 1683 } 1684 1685 /* From FreeBSD */ 1686 /* XXX: optimize */ 1687 uint32_t net_crc32(const uint8_t *p, int len) 1688 { 1689 uint32_t crc; 1690 int carry, i, j; 1691 uint8_t b; 1692 1693 crc = 0xffffffff; 1694 for (i = 0; i < len; i++) { 1695 b = *p++; 1696 for (j = 0; j < 8; j++) { 1697 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1698 crc <<= 1; 1699 b >>= 1; 1700 if (carry) { 1701 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1702 } 1703 } 1704 } 1705 1706 return crc; 1707 } 1708 1709 uint32_t net_crc32_le(const uint8_t *p, int len) 1710 { 1711 uint32_t crc; 1712 int carry, i, j; 1713 uint8_t b; 1714 1715 crc = 0xffffffff; 1716 for (i = 0; i < len; i++) { 1717 b = *p++; 1718 for (j = 0; j < 8; j++) { 1719 carry = (crc & 0x1) ^ (b & 0x01); 1720 crc >>= 1; 1721 b >>= 1; 1722 if (carry) { 1723 crc ^= POLYNOMIAL_LE; 1724 } 1725 } 1726 } 1727 1728 return crc; 1729 } 1730 1731 QemuOptsList qemu_netdev_opts = { 1732 .name = "netdev", 1733 .implied_opt_name = "type", 1734 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1735 .desc = { 1736 /* 1737 * no elements => accept any params 1738 * validation will happen later 1739 */ 1740 { /* end of list */ } 1741 }, 1742 }; 1743 1744 QemuOptsList qemu_nic_opts = { 1745 .name = "nic", 1746 .implied_opt_name = "type", 1747 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1748 .desc = { 1749 /* 1750 * no elements => accept any params 1751 * validation will happen later 1752 */ 1753 { /* end of list */ } 1754 }, 1755 }; 1756 1757 QemuOptsList qemu_net_opts = { 1758 .name = "net", 1759 .implied_opt_name = "type", 1760 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1761 .desc = { 1762 /* 1763 * no elements => accept any params 1764 * validation will happen later 1765 */ 1766 { /* end of list */ } 1767 }, 1768 }; 1769 1770 void net_socket_rs_init(SocketReadState *rs, 1771 SocketReadStateFinalize *finalize, 1772 bool vnet_hdr) 1773 { 1774 rs->state = 0; 1775 rs->vnet_hdr = vnet_hdr; 1776 rs->index = 0; 1777 rs->packet_len = 0; 1778 rs->vnet_hdr_len = 0; 1779 memset(rs->buf, 0, sizeof(rs->buf)); 1780 rs->finalize = finalize; 1781 } 1782 1783 /* 1784 * Returns 1785 * 0: success 1786 * -1: error occurs 1787 */ 1788 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1789 { 1790 unsigned int l; 1791 1792 while (size > 0) { 1793 /* Reassemble a packet from the network. 1794 * 0 = getting length. 1795 * 1 = getting vnet header length. 1796 * 2 = getting data. 1797 */ 1798 switch (rs->state) { 1799 case 0: 1800 l = 4 - rs->index; 1801 if (l > size) { 1802 l = size; 1803 } 1804 memcpy(rs->buf + rs->index, buf, l); 1805 buf += l; 1806 size -= l; 1807 rs->index += l; 1808 if (rs->index == 4) { 1809 /* got length */ 1810 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1811 rs->index = 0; 1812 if (rs->vnet_hdr) { 1813 rs->state = 1; 1814 } else { 1815 rs->state = 2; 1816 rs->vnet_hdr_len = 0; 1817 } 1818 } 1819 break; 1820 case 1: 1821 l = 4 - rs->index; 1822 if (l > size) { 1823 l = size; 1824 } 1825 memcpy(rs->buf + rs->index, buf, l); 1826 buf += l; 1827 size -= l; 1828 rs->index += l; 1829 if (rs->index == 4) { 1830 /* got vnet header length */ 1831 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1832 rs->index = 0; 1833 rs->state = 2; 1834 } 1835 break; 1836 case 2: 1837 l = rs->packet_len - rs->index; 1838 if (l > size) { 1839 l = size; 1840 } 1841 if (rs->index + l <= sizeof(rs->buf)) { 1842 memcpy(rs->buf + rs->index, buf, l); 1843 } else { 1844 fprintf(stderr, "serious error: oversized packet received," 1845 "connection terminated.\n"); 1846 rs->index = rs->state = 0; 1847 return -1; 1848 } 1849 1850 rs->index += l; 1851 buf += l; 1852 size -= l; 1853 if (rs->index >= rs->packet_len) { 1854 rs->index = 0; 1855 rs->state = 0; 1856 assert(rs->finalize); 1857 rs->finalize(rs); 1858 } 1859 break; 1860 } 1861 } 1862 1863 assert(size == 0); 1864 return 0; 1865 }