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 #include "qemu-common.h" 27 28 #include "net/net.h" 29 #include "clients.h" 30 #include "hub.h" 31 #include "hw/qdev-properties.h" 32 #include "net/slirp.h" 33 #include "net/eth.h" 34 #include "util.h" 35 36 #include "monitor/monitor.h" 37 #include "qemu/help_option.h" 38 #include "qapi/qapi-commands-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 "qapi/error.h" 52 #include "qapi/opts-visitor.h" 53 #include "sysemu/sysemu.h" 54 #include "sysemu/runstate.h" 55 #include "sysemu/sysemu.h" 56 #include "net/filter.h" 57 #include "qapi/string-output-visitor.h" 58 #include "qapi/hmp-output-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 /***********************************************************/ 69 /* network device redirectors */ 70 71 int parse_host_port(struct sockaddr_in *saddr, const char *str, 72 Error **errp) 73 { 74 gchar **substrings; 75 struct hostent *he; 76 const char *addr, *p, *r; 77 int port, ret = 0; 78 79 substrings = g_strsplit(str, ":", 2); 80 if (!substrings || !substrings[0] || !substrings[1]) { 81 error_setg(errp, "host address '%s' doesn't contain ':' " 82 "separating host from port", str); 83 ret = -1; 84 goto out; 85 } 86 87 addr = substrings[0]; 88 p = substrings[1]; 89 90 saddr->sin_family = AF_INET; 91 if (addr[0] == '\0') { 92 saddr->sin_addr.s_addr = 0; 93 } else { 94 if (qemu_isdigit(addr[0])) { 95 if (!inet_aton(addr, &saddr->sin_addr)) { 96 error_setg(errp, "host address '%s' is not a valid " 97 "IPv4 address", addr); 98 ret = -1; 99 goto out; 100 } 101 } else { 102 he = gethostbyname(addr); 103 if (he == NULL) { 104 error_setg(errp, "can't resolve host address '%s'", addr); 105 ret = -1; 106 goto out; 107 } 108 saddr->sin_addr = *(struct in_addr *)he->h_addr; 109 } 110 } 111 port = strtol(p, (char **)&r, 0); 112 if (r == p) { 113 error_setg(errp, "port number '%s' is invalid", p); 114 ret = -1; 115 goto out; 116 } 117 saddr->sin_port = htons(port); 118 119 out: 120 g_strfreev(substrings); 121 return ret; 122 } 123 124 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 125 { 126 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 127 macaddr[0], macaddr[1], macaddr[2], 128 macaddr[3], macaddr[4], macaddr[5]); 129 } 130 131 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 132 { 133 g_free(nc->info_str); 134 nc->info_str = g_strdup_printf( 135 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 136 nc->model, 137 macaddr[0], macaddr[1], macaddr[2], 138 macaddr[3], macaddr[4], macaddr[5]); 139 } 140 141 static int mac_table[256] = {0}; 142 143 static void qemu_macaddr_set_used(MACAddr *macaddr) 144 { 145 int index; 146 147 for (index = 0x56; index < 0xFF; index++) { 148 if (macaddr->a[5] == index) { 149 mac_table[index]++; 150 } 151 } 152 } 153 154 static void qemu_macaddr_set_free(MACAddr *macaddr) 155 { 156 int index; 157 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 158 159 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 160 return; 161 } 162 for (index = 0x56; index < 0xFF; index++) { 163 if (macaddr->a[5] == index) { 164 mac_table[index]--; 165 } 166 } 167 } 168 169 static int qemu_macaddr_get_free(void) 170 { 171 int index; 172 173 for (index = 0x56; index < 0xFF; index++) { 174 if (mac_table[index] == 0) { 175 return index; 176 } 177 } 178 179 return -1; 180 } 181 182 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 183 { 184 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 185 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 186 187 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 188 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 189 return; 190 } else { 191 qemu_macaddr_set_used(macaddr); 192 return; 193 } 194 } 195 196 macaddr->a[0] = 0x52; 197 macaddr->a[1] = 0x54; 198 macaddr->a[2] = 0x00; 199 macaddr->a[3] = 0x12; 200 macaddr->a[4] = 0x34; 201 macaddr->a[5] = qemu_macaddr_get_free(); 202 qemu_macaddr_set_used(macaddr); 203 } 204 205 /** 206 * Generate a name for net client 207 * 208 * Only net clients created with the legacy -net option and NICs need this. 209 */ 210 static char *assign_name(NetClientState *nc1, const char *model) 211 { 212 NetClientState *nc; 213 int id = 0; 214 215 QTAILQ_FOREACH(nc, &net_clients, next) { 216 if (nc == nc1) { 217 continue; 218 } 219 if (strcmp(nc->model, model) == 0) { 220 id++; 221 } 222 } 223 224 return g_strdup_printf("%s.%d", model, id); 225 } 226 227 static void qemu_net_client_destructor(NetClientState *nc) 228 { 229 g_free(nc); 230 } 231 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 232 unsigned flags, 233 const struct iovec *iov, 234 int iovcnt, 235 void *opaque); 236 237 static void qemu_net_client_setup(NetClientState *nc, 238 NetClientInfo *info, 239 NetClientState *peer, 240 const char *model, 241 const char *name, 242 NetClientDestructor *destructor) 243 { 244 nc->info = info; 245 nc->model = g_strdup(model); 246 if (name) { 247 nc->name = g_strdup(name); 248 } else { 249 nc->name = assign_name(nc, model); 250 } 251 252 if (peer) { 253 assert(!peer->peer); 254 nc->peer = peer; 255 peer->peer = nc; 256 } 257 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 258 259 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 260 nc->destructor = destructor; 261 QTAILQ_INIT(&nc->filters); 262 } 263 264 NetClientState *qemu_new_net_client(NetClientInfo *info, 265 NetClientState *peer, 266 const char *model, 267 const char *name) 268 { 269 NetClientState *nc; 270 271 assert(info->size >= sizeof(NetClientState)); 272 273 nc = g_malloc0(info->size); 274 qemu_net_client_setup(nc, info, peer, model, name, 275 qemu_net_client_destructor); 276 277 return nc; 278 } 279 280 NICState *qemu_new_nic(NetClientInfo *info, 281 NICConf *conf, 282 const char *model, 283 const char *name, 284 void *opaque) 285 { 286 NetClientState **peers = conf->peers.ncs; 287 NICState *nic; 288 int i, queues = MAX(1, conf->peers.queues); 289 290 assert(info->type == NET_CLIENT_DRIVER_NIC); 291 assert(info->size >= sizeof(NICState)); 292 293 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 294 nic->ncs = (void *)nic + info->size; 295 nic->conf = conf; 296 nic->opaque = opaque; 297 298 for (i = 0; i < queues; i++) { 299 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 300 NULL); 301 nic->ncs[i].queue_index = i; 302 } 303 304 return nic; 305 } 306 307 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 308 { 309 return nic->ncs + queue_index; 310 } 311 312 NetClientState *qemu_get_queue(NICState *nic) 313 { 314 return qemu_get_subqueue(nic, 0); 315 } 316 317 NICState *qemu_get_nic(NetClientState *nc) 318 { 319 NetClientState *nc0 = nc - nc->queue_index; 320 321 return (NICState *)((void *)nc0 - nc->info->size); 322 } 323 324 void *qemu_get_nic_opaque(NetClientState *nc) 325 { 326 NICState *nic = qemu_get_nic(nc); 327 328 return nic->opaque; 329 } 330 331 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 332 { 333 assert(nc != NULL); 334 NetClientState *ncs = nc + queue_index; 335 return ncs->peer; 336 } 337 338 static void qemu_cleanup_net_client(NetClientState *nc) 339 { 340 QTAILQ_REMOVE(&net_clients, nc, next); 341 342 if (nc->info->cleanup) { 343 nc->info->cleanup(nc); 344 } 345 } 346 347 static void qemu_free_net_client(NetClientState *nc) 348 { 349 if (nc->incoming_queue) { 350 qemu_del_net_queue(nc->incoming_queue); 351 } 352 if (nc->peer) { 353 nc->peer->peer = NULL; 354 } 355 g_free(nc->name); 356 g_free(nc->model); 357 g_free(nc->info_str); 358 qapi_free_NetdevInfo(nc->stored_config); 359 if (nc->destructor) { 360 nc->destructor(nc); 361 } 362 } 363 364 void qemu_del_net_client(NetClientState *nc) 365 { 366 NetClientState *ncs[MAX_QUEUE_NUM]; 367 int queues, i; 368 NetFilterState *nf, *next; 369 370 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 371 372 /* If the NetClientState belongs to a multiqueue backend, we will change all 373 * other NetClientStates also. 374 */ 375 queues = qemu_find_net_clients_except(nc->name, ncs, 376 NET_CLIENT_DRIVER_NIC, 377 MAX_QUEUE_NUM); 378 assert(queues != 0); 379 380 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 381 object_unparent(OBJECT(nf)); 382 } 383 384 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 385 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 386 NICState *nic = qemu_get_nic(nc->peer); 387 if (nic->peer_deleted) { 388 return; 389 } 390 nic->peer_deleted = true; 391 392 for (i = 0; i < queues; i++) { 393 ncs[i]->peer->link_down = true; 394 } 395 396 if (nc->peer->info->link_status_changed) { 397 nc->peer->info->link_status_changed(nc->peer); 398 } 399 400 for (i = 0; i < queues; i++) { 401 qemu_cleanup_net_client(ncs[i]); 402 } 403 404 return; 405 } 406 407 for (i = 0; i < queues; i++) { 408 qemu_cleanup_net_client(ncs[i]); 409 qemu_free_net_client(ncs[i]); 410 } 411 } 412 413 void qemu_del_nic(NICState *nic) 414 { 415 int i, queues = MAX(nic->conf->peers.queues, 1); 416 417 qemu_macaddr_set_free(&nic->conf->macaddr); 418 419 for (i = 0; i < queues; i++) { 420 NetClientState *nc = qemu_get_subqueue(nic, i); 421 /* If this is a peer NIC and peer has already been deleted, free it now. */ 422 if (nic->peer_deleted) { 423 qemu_free_net_client(nc->peer); 424 } else if (nc->peer) { 425 /* if there are RX packets pending, complete them */ 426 qemu_purge_queued_packets(nc->peer); 427 } 428 } 429 430 for (i = queues - 1; i >= 0; i--) { 431 NetClientState *nc = qemu_get_subqueue(nic, i); 432 433 qemu_cleanup_net_client(nc); 434 qemu_free_net_client(nc); 435 } 436 437 g_free(nic); 438 } 439 440 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 441 { 442 NetClientState *nc; 443 444 QTAILQ_FOREACH(nc, &net_clients, next) { 445 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 446 if (nc->queue_index == 0) { 447 func(qemu_get_nic(nc), opaque); 448 } 449 } 450 } 451 } 452 453 bool qemu_has_ufo(NetClientState *nc) 454 { 455 if (!nc || !nc->info->has_ufo) { 456 return false; 457 } 458 459 return nc->info->has_ufo(nc); 460 } 461 462 bool qemu_has_vnet_hdr(NetClientState *nc) 463 { 464 if (!nc || !nc->info->has_vnet_hdr) { 465 return false; 466 } 467 468 return nc->info->has_vnet_hdr(nc); 469 } 470 471 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 472 { 473 if (!nc || !nc->info->has_vnet_hdr_len) { 474 return false; 475 } 476 477 return nc->info->has_vnet_hdr_len(nc, len); 478 } 479 480 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 481 { 482 if (!nc || !nc->info->using_vnet_hdr) { 483 return; 484 } 485 486 nc->info->using_vnet_hdr(nc, enable); 487 } 488 489 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 490 int ecn, int ufo) 491 { 492 if (!nc || !nc->info->set_offload) { 493 return; 494 } 495 496 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 497 } 498 499 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 500 { 501 if (!nc || !nc->info->set_vnet_hdr_len) { 502 return; 503 } 504 505 nc->vnet_hdr_len = len; 506 nc->info->set_vnet_hdr_len(nc, len); 507 } 508 509 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 510 { 511 #ifdef HOST_WORDS_BIGENDIAN 512 if (!nc || !nc->info->set_vnet_le) { 513 return -ENOSYS; 514 } 515 516 return nc->info->set_vnet_le(nc, is_le); 517 #else 518 return 0; 519 #endif 520 } 521 522 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 523 { 524 #ifdef HOST_WORDS_BIGENDIAN 525 return 0; 526 #else 527 if (!nc || !nc->info->set_vnet_be) { 528 return -ENOSYS; 529 } 530 531 return nc->info->set_vnet_be(nc, is_be); 532 #endif 533 } 534 535 int qemu_can_receive_packet(NetClientState *nc) 536 { 537 if (nc->receive_disabled) { 538 return 0; 539 } else if (nc->info->can_receive && 540 !nc->info->can_receive(nc)) { 541 return 0; 542 } 543 return 1; 544 } 545 546 int qemu_can_send_packet(NetClientState *sender) 547 { 548 int vm_running = runstate_is_running(); 549 550 if (!vm_running) { 551 return 0; 552 } 553 554 if (!sender->peer) { 555 return 1; 556 } 557 558 return qemu_can_receive_packet(sender->peer); 559 } 560 561 static ssize_t filter_receive_iov(NetClientState *nc, 562 NetFilterDirection direction, 563 NetClientState *sender, 564 unsigned flags, 565 const struct iovec *iov, 566 int iovcnt, 567 NetPacketSent *sent_cb) 568 { 569 ssize_t ret = 0; 570 NetFilterState *nf = NULL; 571 572 if (direction == NET_FILTER_DIRECTION_TX) { 573 QTAILQ_FOREACH(nf, &nc->filters, next) { 574 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 575 iovcnt, sent_cb); 576 if (ret) { 577 return ret; 578 } 579 } 580 } else { 581 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 582 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 583 iovcnt, sent_cb); 584 if (ret) { 585 return ret; 586 } 587 } 588 } 589 590 return ret; 591 } 592 593 static ssize_t filter_receive(NetClientState *nc, 594 NetFilterDirection direction, 595 NetClientState *sender, 596 unsigned flags, 597 const uint8_t *data, 598 size_t size, 599 NetPacketSent *sent_cb) 600 { 601 struct iovec iov = { 602 .iov_base = (void *)data, 603 .iov_len = size 604 }; 605 606 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 607 } 608 609 void qemu_purge_queued_packets(NetClientState *nc) 610 { 611 if (!nc->peer) { 612 return; 613 } 614 615 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 616 } 617 618 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 619 { 620 nc->receive_disabled = 0; 621 622 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 623 if (net_hub_flush(nc->peer)) { 624 qemu_notify_event(); 625 } 626 } 627 if (qemu_net_queue_flush(nc->incoming_queue)) { 628 /* We emptied the queue successfully, signal to the IO thread to repoll 629 * the file descriptor (for tap, for example). 630 */ 631 qemu_notify_event(); 632 } else if (purge) { 633 /* Unable to empty the queue, purge remaining packets */ 634 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 635 } 636 } 637 638 void qemu_flush_queued_packets(NetClientState *nc) 639 { 640 qemu_flush_or_purge_queued_packets(nc, false); 641 } 642 643 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 644 unsigned flags, 645 const uint8_t *buf, int size, 646 NetPacketSent *sent_cb) 647 { 648 NetQueue *queue; 649 int ret; 650 651 #ifdef DEBUG_NET 652 printf("qemu_send_packet_async:\n"); 653 qemu_hexdump(stdout, "net", buf, size); 654 #endif 655 656 if (sender->link_down || !sender->peer) { 657 return size; 658 } 659 660 /* Let filters handle the packet first */ 661 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 662 sender, flags, buf, size, sent_cb); 663 if (ret) { 664 return ret; 665 } 666 667 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 668 sender, flags, buf, size, sent_cb); 669 if (ret) { 670 return ret; 671 } 672 673 queue = sender->peer->incoming_queue; 674 675 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 676 } 677 678 ssize_t qemu_send_packet_async(NetClientState *sender, 679 const uint8_t *buf, int size, 680 NetPacketSent *sent_cb) 681 { 682 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 683 buf, size, sent_cb); 684 } 685 686 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 687 { 688 return qemu_send_packet_async(nc, buf, size, NULL); 689 } 690 691 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 692 { 693 if (!qemu_can_receive_packet(nc)) { 694 return 0; 695 } 696 697 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 698 } 699 700 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 701 int iovcnt) 702 { 703 if (!qemu_can_receive_packet(nc)) { 704 return 0; 705 } 706 707 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 708 } 709 710 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 711 { 712 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 713 buf, size, NULL); 714 } 715 716 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 717 int iovcnt, unsigned flags) 718 { 719 uint8_t *buf = NULL; 720 uint8_t *buffer; 721 size_t offset; 722 ssize_t ret; 723 724 if (iovcnt == 1) { 725 buffer = iov[0].iov_base; 726 offset = iov[0].iov_len; 727 } else { 728 offset = iov_size(iov, iovcnt); 729 if (offset > NET_BUFSIZE) { 730 return -1; 731 } 732 buf = g_malloc(offset); 733 buffer = buf; 734 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 735 } 736 737 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 738 ret = nc->info->receive_raw(nc, buffer, offset); 739 } else { 740 ret = nc->info->receive(nc, buffer, offset); 741 } 742 743 g_free(buf); 744 return ret; 745 } 746 747 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 748 unsigned flags, 749 const struct iovec *iov, 750 int iovcnt, 751 void *opaque) 752 { 753 NetClientState *nc = opaque; 754 int ret; 755 756 757 if (nc->link_down) { 758 return iov_size(iov, iovcnt); 759 } 760 761 if (nc->receive_disabled) { 762 return 0; 763 } 764 765 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 766 ret = nc->info->receive_iov(nc, iov, iovcnt); 767 } else { 768 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 769 } 770 771 if (ret == 0) { 772 nc->receive_disabled = 1; 773 } 774 775 return ret; 776 } 777 778 ssize_t qemu_sendv_packet_async(NetClientState *sender, 779 const struct iovec *iov, int iovcnt, 780 NetPacketSent *sent_cb) 781 { 782 NetQueue *queue; 783 size_t size = iov_size(iov, iovcnt); 784 int ret; 785 786 if (size > NET_BUFSIZE) { 787 return size; 788 } 789 790 if (sender->link_down || !sender->peer) { 791 return size; 792 } 793 794 /* Let filters handle the packet first */ 795 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 796 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 797 if (ret) { 798 return ret; 799 } 800 801 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 802 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 803 if (ret) { 804 return ret; 805 } 806 807 queue = sender->peer->incoming_queue; 808 809 return qemu_net_queue_send_iov(queue, sender, 810 QEMU_NET_PACKET_FLAG_NONE, 811 iov, iovcnt, sent_cb); 812 } 813 814 ssize_t 815 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 816 { 817 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 818 } 819 820 NetClientState *qemu_find_netdev(const char *id) 821 { 822 NetClientState *nc; 823 824 QTAILQ_FOREACH(nc, &net_clients, next) { 825 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 826 continue; 827 if (!strcmp(nc->name, id)) { 828 return nc; 829 } 830 } 831 832 return NULL; 833 } 834 835 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 836 NetClientDriver type, int max) 837 { 838 NetClientState *nc; 839 int ret = 0; 840 841 QTAILQ_FOREACH(nc, &net_clients, next) { 842 if (nc->info->type == type) { 843 continue; 844 } 845 if (!id || !strcmp(nc->name, id)) { 846 if (ret < max) { 847 ncs[ret] = nc; 848 } 849 ret++; 850 } 851 } 852 853 return ret; 854 } 855 856 static int nic_get_free_idx(void) 857 { 858 int index; 859 860 for (index = 0; index < MAX_NICS; index++) 861 if (!nd_table[index].used) 862 return index; 863 return -1; 864 } 865 866 int qemu_show_nic_models(const char *arg, const char *const *models) 867 { 868 int i; 869 870 if (!arg || !is_help_option(arg)) { 871 return 0; 872 } 873 874 printf("Supported NIC models:\n"); 875 for (i = 0 ; models[i]; i++) { 876 printf("%s\n", models[i]); 877 } 878 return 1; 879 } 880 881 void qemu_check_nic_model(NICInfo *nd, const char *model) 882 { 883 const char *models[2]; 884 885 models[0] = model; 886 models[1] = NULL; 887 888 if (qemu_show_nic_models(nd->model, models)) 889 exit(0); 890 if (qemu_find_nic_model(nd, models, model) < 0) 891 exit(1); 892 } 893 894 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 895 const char *default_model) 896 { 897 int i; 898 899 if (!nd->model) 900 nd->model = g_strdup(default_model); 901 902 for (i = 0 ; models[i]; i++) { 903 if (strcmp(nd->model, models[i]) == 0) 904 return i; 905 } 906 907 error_report("Unsupported NIC model: %s", nd->model); 908 return -1; 909 } 910 911 static int net_init_nic(const Netdev *netdev, const char *name, 912 NetClientState *peer, Error **errp) 913 { 914 int idx; 915 NICInfo *nd; 916 const NetLegacyNicOptions *nic; 917 918 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 919 nic = &netdev->u.nic; 920 921 idx = nic_get_free_idx(); 922 if (idx == -1 || nb_nics >= MAX_NICS) { 923 error_setg(errp, "too many NICs"); 924 return -1; 925 } 926 927 nd = &nd_table[idx]; 928 929 memset(nd, 0, sizeof(*nd)); 930 931 if (nic->has_netdev) { 932 nd->netdev = qemu_find_netdev(nic->netdev); 933 if (!nd->netdev) { 934 error_setg(errp, "netdev '%s' not found", nic->netdev); 935 return -1; 936 } 937 } else { 938 assert(peer); 939 nd->netdev = peer; 940 } 941 nd->name = g_strdup(name); 942 if (nic->has_model) { 943 nd->model = g_strdup(nic->model); 944 } 945 if (nic->has_addr) { 946 nd->devaddr = g_strdup(nic->addr); 947 } 948 949 if (nic->has_macaddr && 950 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 951 error_setg(errp, "invalid syntax for ethernet address"); 952 return -1; 953 } 954 if (nic->has_macaddr && 955 is_multicast_ether_addr(nd->macaddr.a)) { 956 error_setg(errp, 957 "NIC cannot have multicast MAC address (odd 1st byte)"); 958 return -1; 959 } 960 qemu_macaddr_default_if_unset(&nd->macaddr); 961 962 if (nic->has_vectors) { 963 if (nic->vectors > 0x7ffffff) { 964 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 965 return -1; 966 } 967 nd->nvectors = nic->vectors; 968 } else { 969 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 970 } 971 972 nd->used = 1; 973 nb_nics++; 974 975 return idx; 976 } 977 978 979 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 980 const Netdev *netdev, 981 const char *name, 982 NetClientState *peer, Error **errp) = { 983 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 984 #ifdef CONFIG_SLIRP 985 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 986 #endif 987 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 988 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 989 #ifdef CONFIG_VDE 990 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 991 #endif 992 #ifdef CONFIG_NETMAP 993 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 994 #endif 995 #ifdef CONFIG_NET_BRIDGE 996 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 997 #endif 998 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 999 #ifdef CONFIG_VHOST_NET_USER 1000 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1001 #endif 1002 #ifdef CONFIG_VHOST_NET_VDPA 1003 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1004 #endif 1005 #ifdef CONFIG_L2TPV3 1006 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1007 #endif 1008 }; 1009 1010 1011 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1012 { 1013 NetClientState *peer = NULL; 1014 NetClientState *nc; 1015 1016 if (is_netdev) { 1017 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1018 !net_client_init_fun[netdev->type]) { 1019 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1020 "a netdev backend type"); 1021 return -1; 1022 } 1023 } else { 1024 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1025 return 0; /* nothing to do */ 1026 } 1027 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 1028 !net_client_init_fun[netdev->type]) { 1029 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1030 "a net backend type (maybe it is not compiled " 1031 "into this binary)"); 1032 return -1; 1033 } 1034 1035 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1036 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1037 !netdev->u.nic.has_netdev) { 1038 peer = net_hub_add_port(0, NULL, NULL); 1039 } 1040 } 1041 1042 nc = qemu_find_netdev(netdev->id); 1043 if (nc) { 1044 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1045 return -1; 1046 } 1047 1048 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1049 /* FIXME drop when all init functions store an Error */ 1050 if (errp && !*errp) { 1051 error_setg(errp, "Device '%s' could not be initialized", 1052 NetClientDriver_str(netdev->type)); 1053 } 1054 return -1; 1055 } 1056 1057 if (is_netdev) { 1058 nc = qemu_find_netdev(netdev->id); 1059 assert(nc); 1060 nc->is_netdev = true; 1061 } 1062 1063 return 0; 1064 } 1065 1066 void show_netdevs(void) 1067 { 1068 int idx; 1069 const char *available_netdevs[] = { 1070 "socket", 1071 "hubport", 1072 "tap", 1073 #ifdef CONFIG_SLIRP 1074 "user", 1075 #endif 1076 #ifdef CONFIG_L2TPV3 1077 "l2tpv3", 1078 #endif 1079 #ifdef CONFIG_VDE 1080 "vde", 1081 #endif 1082 #ifdef CONFIG_NET_BRIDGE 1083 "bridge", 1084 #endif 1085 #ifdef CONFIG_NETMAP 1086 "netmap", 1087 #endif 1088 #ifdef CONFIG_POSIX 1089 "vhost-user", 1090 #endif 1091 #ifdef CONFIG_VHOST_VDPA 1092 "vhost-vdpa", 1093 #endif 1094 }; 1095 1096 qemu_printf("Available netdev backend types:\n"); 1097 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1098 qemu_printf("%s\n", available_netdevs[idx]); 1099 } 1100 } 1101 1102 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1103 { 1104 gchar **substrings = NULL; 1105 Netdev *object = NULL; 1106 int ret = -1; 1107 Visitor *v = opts_visitor_new(opts); 1108 1109 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1110 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1111 1112 if (ip6_net) { 1113 char *prefix_addr; 1114 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1115 1116 substrings = g_strsplit(ip6_net, "/", 2); 1117 if (!substrings || !substrings[0]) { 1118 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1119 "a valid IPv6 prefix"); 1120 goto out; 1121 } 1122 1123 prefix_addr = substrings[0]; 1124 1125 /* Handle user-specified prefix length. */ 1126 if (substrings[1] && 1127 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1128 { 1129 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1130 "ipv6-prefixlen", "a number"); 1131 goto out; 1132 } 1133 1134 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1135 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1136 &error_abort); 1137 qemu_opt_unset(opts, "ipv6-net"); 1138 } 1139 1140 /* Create an ID for -net if the user did not specify one */ 1141 if (!is_netdev && !qemu_opts_id(opts)) { 1142 qemu_opts_set_id(opts, id_generate(ID_NET)); 1143 } 1144 1145 if (visit_type_Netdev(v, NULL, &object, errp)) { 1146 ret = net_client_init1(object, is_netdev, errp); 1147 } 1148 1149 qapi_free_Netdev(object); 1150 1151 out: 1152 g_strfreev(substrings); 1153 visit_free(v); 1154 return ret; 1155 } 1156 1157 void netdev_add(QemuOpts *opts, Error **errp) 1158 { 1159 net_client_init(opts, true, errp); 1160 } 1161 1162 void qmp_netdev_add(Netdev *netdev, Error **errp) 1163 { 1164 if (!id_wellformed(netdev->id)) { 1165 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1166 return; 1167 } 1168 1169 net_client_init1(netdev, true, errp); 1170 } 1171 1172 void qmp_netdev_del(const char *id, Error **errp) 1173 { 1174 NetClientState *nc; 1175 QemuOpts *opts; 1176 1177 nc = qemu_find_netdev(id); 1178 if (!nc) { 1179 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1180 "Device '%s' not found", id); 1181 return; 1182 } 1183 1184 if (!nc->is_netdev) { 1185 error_setg(errp, "Device '%s' is not a netdev", id); 1186 return; 1187 } 1188 1189 qemu_del_net_client(nc); 1190 1191 /* 1192 * Wart: we need to delete the QemuOpts associated with netdevs 1193 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1194 * HMP netdev_add. 1195 */ 1196 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1197 if (opts) { 1198 qemu_opts_del(opts); 1199 } 1200 } 1201 1202 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1203 { 1204 char *str; 1205 ObjectProperty *prop; 1206 ObjectPropertyIterator iter; 1207 Visitor *v; 1208 1209 /* generate info str */ 1210 object_property_iter_init(&iter, OBJECT(nf)); 1211 while ((prop = object_property_iter_next(&iter))) { 1212 if (!strcmp(prop->name, "type")) { 1213 continue; 1214 } 1215 v = string_output_visitor_new(false, &str); 1216 object_property_get(OBJECT(nf), prop->name, v, NULL); 1217 visit_complete(v, &str); 1218 visit_free(v); 1219 monitor_printf(mon, ",%s=%s", prop->name, str); 1220 g_free(str); 1221 } 1222 monitor_printf(mon, "\n"); 1223 } 1224 1225 static char *generate_info_str(NetClientState *nc) 1226 { 1227 NetdevInfo *ni = nc->stored_config; 1228 char *ret_out = NULL; 1229 Visitor *v; 1230 1231 /* Use legacy field info_str for NIC and hubports */ 1232 if ((nc->info->type == NET_CLIENT_DRIVER_NIC) || 1233 (nc->info->type == NET_CLIENT_DRIVER_HUBPORT)) { 1234 return g_strdup(nc->info_str ? nc->info_str : ""); 1235 } 1236 1237 if (!ni) { 1238 return g_malloc0(1); 1239 } 1240 1241 v = hmp_output_visitor_new(&ret_out); 1242 if (visit_type_NetdevInfo(v, "", &ni, NULL)) { 1243 visit_complete(v, &ret_out); 1244 } 1245 visit_free(v); 1246 1247 return ret_out; 1248 } 1249 1250 void print_net_client(Monitor *mon, NetClientState *nc) 1251 { 1252 NetFilterState *nf; 1253 char *info_str = generate_info_str(nc); 1254 1255 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1256 nc->queue_index, 1257 NetClientDriver_str(nc->info->type), 1258 info_str); 1259 g_free(info_str); 1260 1261 if (!QTAILQ_EMPTY(&nc->filters)) { 1262 monitor_printf(mon, "filters:\n"); 1263 } 1264 QTAILQ_FOREACH(nf, &nc->filters, next) { 1265 monitor_printf(mon, " - %s: type=%s", 1266 object_get_canonical_path_component(OBJECT(nf)), 1267 object_get_typename(OBJECT(nf))); 1268 netfilter_print_info(mon, nf); 1269 } 1270 } 1271 1272 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1273 Error **errp) 1274 { 1275 NetClientState *nc; 1276 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1277 1278 QTAILQ_FOREACH(nc, &net_clients, next) { 1279 RxFilterInfo *info; 1280 1281 if (has_name && strcmp(nc->name, name) != 0) { 1282 continue; 1283 } 1284 1285 /* only query rx-filter information of NIC */ 1286 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1287 if (has_name) { 1288 error_setg(errp, "net client(%s) isn't a NIC", name); 1289 assert(!filter_list); 1290 return NULL; 1291 } 1292 continue; 1293 } 1294 1295 /* only query information on queue 0 since the info is per nic, 1296 * not per queue 1297 */ 1298 if (nc->queue_index != 0) 1299 continue; 1300 1301 if (nc->info->query_rx_filter) { 1302 info = nc->info->query_rx_filter(nc); 1303 QAPI_LIST_APPEND(tail, info); 1304 } else if (has_name) { 1305 error_setg(errp, "net client(%s) doesn't support" 1306 " rx-filter querying", name); 1307 assert(!filter_list); 1308 return NULL; 1309 } 1310 1311 if (has_name) { 1312 break; 1313 } 1314 } 1315 1316 if (filter_list == NULL && has_name) { 1317 error_setg(errp, "invalid net client name: %s", name); 1318 } 1319 1320 return filter_list; 1321 } 1322 1323 NetdevInfoList *qmp_query_netdev(Error **errp) 1324 { 1325 NetdevInfoList *list = NULL; 1326 NetClientState *nc; 1327 1328 QTAILQ_FOREACH(nc, &net_clients, next) { 1329 /* 1330 * Only look at netdevs (backend network devices), not for each queue 1331 * or NIC / hubport 1332 */ 1333 if (nc->stored_config) { 1334 NetdevInfo *element = QAPI_CLONE(NetdevInfo, nc->stored_config); 1335 1336 g_free(element->id); /* Need to dealloc empty id after clone */ 1337 element->id = g_strdup(nc->name); 1338 1339 element->has_peer_id = nc->peer != NULL; 1340 if (element->has_peer_id) { 1341 element->peer_id = g_strdup(nc->peer->name); 1342 } 1343 1344 QAPI_LIST_PREPEND(list, element); 1345 } 1346 } 1347 1348 return list; 1349 } 1350 1351 void hmp_info_network(Monitor *mon, const QDict *qdict) 1352 { 1353 NetClientState *nc, *peer; 1354 NetClientDriver type; 1355 1356 net_hub_info(mon); 1357 1358 QTAILQ_FOREACH(nc, &net_clients, next) { 1359 peer = nc->peer; 1360 type = nc->info->type; 1361 1362 /* Skip if already printed in hub info */ 1363 if (net_hub_id_for_client(nc, NULL) == 0) { 1364 continue; 1365 } 1366 1367 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1368 print_net_client(mon, nc); 1369 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1370 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1371 monitor_printf(mon, " \\ "); 1372 print_net_client(mon, peer); 1373 } 1374 } 1375 } 1376 1377 void colo_notify_filters_event(int event, Error **errp) 1378 { 1379 NetClientState *nc; 1380 NetFilterState *nf; 1381 NetFilterClass *nfc = NULL; 1382 Error *local_err = NULL; 1383 1384 QTAILQ_FOREACH(nc, &net_clients, next) { 1385 QTAILQ_FOREACH(nf, &nc->filters, next) { 1386 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1387 nfc->handle_event(nf, event, &local_err); 1388 if (local_err) { 1389 error_propagate(errp, local_err); 1390 return; 1391 } 1392 } 1393 } 1394 } 1395 1396 void qmp_set_link(const char *name, bool up, Error **errp) 1397 { 1398 NetClientState *ncs[MAX_QUEUE_NUM]; 1399 NetClientState *nc; 1400 int queues, i; 1401 1402 queues = qemu_find_net_clients_except(name, ncs, 1403 NET_CLIENT_DRIVER__MAX, 1404 MAX_QUEUE_NUM); 1405 1406 if (queues == 0) { 1407 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1408 "Device '%s' not found", name); 1409 return; 1410 } 1411 nc = ncs[0]; 1412 1413 for (i = 0; i < queues; i++) { 1414 ncs[i]->link_down = !up; 1415 } 1416 1417 if (nc->info->link_status_changed) { 1418 nc->info->link_status_changed(nc); 1419 } 1420 1421 if (nc->peer) { 1422 /* Change peer link only if the peer is NIC and then notify peer. 1423 * If the peer is a HUBPORT or a backend, we do not change the 1424 * link status. 1425 * 1426 * This behavior is compatible with qemu hubs where there could be 1427 * multiple clients that can still communicate with each other in 1428 * disconnected mode. For now maintain this compatibility. 1429 */ 1430 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1431 for (i = 0; i < queues; i++) { 1432 ncs[i]->peer->link_down = !up; 1433 } 1434 } 1435 if (nc->peer->info->link_status_changed) { 1436 nc->peer->info->link_status_changed(nc->peer); 1437 } 1438 } 1439 } 1440 1441 static void net_vm_change_state_handler(void *opaque, bool running, 1442 RunState state) 1443 { 1444 NetClientState *nc; 1445 NetClientState *tmp; 1446 1447 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1448 if (running) { 1449 /* Flush queued packets and wake up backends. */ 1450 if (nc->peer && qemu_can_send_packet(nc)) { 1451 qemu_flush_queued_packets(nc->peer); 1452 } 1453 } else { 1454 /* Complete all queued packets, to guarantee we don't modify 1455 * state later when VM is not running. 1456 */ 1457 qemu_flush_or_purge_queued_packets(nc, true); 1458 } 1459 } 1460 } 1461 1462 void net_cleanup(void) 1463 { 1464 NetClientState *nc; 1465 1466 /* We may del multiple entries during qemu_del_net_client(), 1467 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1468 */ 1469 while (!QTAILQ_EMPTY(&net_clients)) { 1470 nc = QTAILQ_FIRST(&net_clients); 1471 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1472 qemu_del_nic(qemu_get_nic(nc)); 1473 } else { 1474 qemu_del_net_client(nc); 1475 } 1476 } 1477 1478 qemu_del_vm_change_state_handler(net_change_state_entry); 1479 } 1480 1481 void net_check_clients(void) 1482 { 1483 NetClientState *nc; 1484 int i; 1485 1486 net_hub_check_clients(); 1487 1488 QTAILQ_FOREACH(nc, &net_clients, next) { 1489 if (!nc->peer) { 1490 warn_report("%s %s has no peer", 1491 nc->info->type == NET_CLIENT_DRIVER_NIC 1492 ? "nic" : "netdev", 1493 nc->name); 1494 } 1495 } 1496 1497 /* Check that all NICs requested via -net nic actually got created. 1498 * NICs created via -device don't need to be checked here because 1499 * they are always instantiated. 1500 */ 1501 for (i = 0; i < MAX_NICS; i++) { 1502 NICInfo *nd = &nd_table[i]; 1503 if (nd->used && !nd->instantiated) { 1504 warn_report("requested NIC (%s, model %s) " 1505 "was not created (not supported by this machine?)", 1506 nd->name ? nd->name : "anonymous", 1507 nd->model ? nd->model : "unspecified"); 1508 } 1509 } 1510 } 1511 1512 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1513 { 1514 return net_client_init(opts, false, errp); 1515 } 1516 1517 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1518 { 1519 const char *type = qemu_opt_get(opts, "type"); 1520 1521 if (type && is_help_option(type)) { 1522 show_netdevs(); 1523 exit(0); 1524 } 1525 return net_client_init(opts, true, errp); 1526 } 1527 1528 /* For the convenience "--nic" parameter */ 1529 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1530 { 1531 char *mac, *nd_id; 1532 int idx, ret; 1533 NICInfo *ni; 1534 const char *type; 1535 1536 type = qemu_opt_get(opts, "type"); 1537 if (type && g_str_equal(type, "none")) { 1538 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1539 } 1540 1541 idx = nic_get_free_idx(); 1542 if (idx == -1 || nb_nics >= MAX_NICS) { 1543 error_setg(errp, "no more on-board/default NIC slots available"); 1544 return -1; 1545 } 1546 1547 if (!type) { 1548 qemu_opt_set(opts, "type", "user", &error_abort); 1549 } 1550 1551 ni = &nd_table[idx]; 1552 memset(ni, 0, sizeof(*ni)); 1553 ni->model = qemu_opt_get_del(opts, "model"); 1554 1555 /* Create an ID if the user did not specify one */ 1556 nd_id = g_strdup(qemu_opts_id(opts)); 1557 if (!nd_id) { 1558 nd_id = id_generate(ID_NET); 1559 qemu_opts_set_id(opts, nd_id); 1560 } 1561 1562 /* Handle MAC address */ 1563 mac = qemu_opt_get_del(opts, "mac"); 1564 if (mac) { 1565 ret = net_parse_macaddr(ni->macaddr.a, mac); 1566 g_free(mac); 1567 if (ret) { 1568 error_setg(errp, "invalid syntax for ethernet address"); 1569 goto out; 1570 } 1571 if (is_multicast_ether_addr(ni->macaddr.a)) { 1572 error_setg(errp, "NIC cannot have multicast MAC address"); 1573 ret = -1; 1574 goto out; 1575 } 1576 } 1577 qemu_macaddr_default_if_unset(&ni->macaddr); 1578 1579 ret = net_client_init(opts, true, errp); 1580 if (ret == 0) { 1581 ni->netdev = qemu_find_netdev(nd_id); 1582 ni->used = true; 1583 nb_nics++; 1584 } 1585 1586 out: 1587 g_free(nd_id); 1588 return ret; 1589 } 1590 1591 int net_init_clients(Error **errp) 1592 { 1593 net_change_state_entry = 1594 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1595 1596 QTAILQ_INIT(&net_clients); 1597 1598 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1599 net_init_netdev, NULL, errp)) { 1600 return -1; 1601 } 1602 1603 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1604 return -1; 1605 } 1606 1607 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1608 return -1; 1609 } 1610 1611 return 0; 1612 } 1613 1614 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1615 { 1616 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1617 return -1; 1618 } 1619 1620 return 0; 1621 } 1622 1623 /* From FreeBSD */ 1624 /* XXX: optimize */ 1625 uint32_t net_crc32(const uint8_t *p, int len) 1626 { 1627 uint32_t crc; 1628 int carry, i, j; 1629 uint8_t b; 1630 1631 crc = 0xffffffff; 1632 for (i = 0; i < len; i++) { 1633 b = *p++; 1634 for (j = 0; j < 8; j++) { 1635 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1636 crc <<= 1; 1637 b >>= 1; 1638 if (carry) { 1639 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1640 } 1641 } 1642 } 1643 1644 return crc; 1645 } 1646 1647 uint32_t net_crc32_le(const uint8_t *p, int len) 1648 { 1649 uint32_t crc; 1650 int carry, i, j; 1651 uint8_t b; 1652 1653 crc = 0xffffffff; 1654 for (i = 0; i < len; i++) { 1655 b = *p++; 1656 for (j = 0; j < 8; j++) { 1657 carry = (crc & 0x1) ^ (b & 0x01); 1658 crc >>= 1; 1659 b >>= 1; 1660 if (carry) { 1661 crc ^= POLYNOMIAL_LE; 1662 } 1663 } 1664 } 1665 1666 return crc; 1667 } 1668 1669 QemuOptsList qemu_netdev_opts = { 1670 .name = "netdev", 1671 .implied_opt_name = "type", 1672 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1673 .desc = { 1674 /* 1675 * no elements => accept any params 1676 * validation will happen later 1677 */ 1678 { /* end of list */ } 1679 }, 1680 }; 1681 1682 QemuOptsList qemu_nic_opts = { 1683 .name = "nic", 1684 .implied_opt_name = "type", 1685 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1686 .desc = { 1687 /* 1688 * no elements => accept any params 1689 * validation will happen later 1690 */ 1691 { /* end of list */ } 1692 }, 1693 }; 1694 1695 QemuOptsList qemu_net_opts = { 1696 .name = "net", 1697 .implied_opt_name = "type", 1698 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1699 .desc = { 1700 /* 1701 * no elements => accept any params 1702 * validation will happen later 1703 */ 1704 { /* end of list */ } 1705 }, 1706 }; 1707 1708 void net_socket_rs_init(SocketReadState *rs, 1709 SocketReadStateFinalize *finalize, 1710 bool vnet_hdr) 1711 { 1712 rs->state = 0; 1713 rs->vnet_hdr = vnet_hdr; 1714 rs->index = 0; 1715 rs->packet_len = 0; 1716 rs->vnet_hdr_len = 0; 1717 memset(rs->buf, 0, sizeof(rs->buf)); 1718 rs->finalize = finalize; 1719 } 1720 1721 /* 1722 * Returns 1723 * 0: success 1724 * -1: error occurs 1725 */ 1726 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1727 { 1728 unsigned int l; 1729 1730 while (size > 0) { 1731 /* Reassemble a packet from the network. 1732 * 0 = getting length. 1733 * 1 = getting vnet header length. 1734 * 2 = getting data. 1735 */ 1736 switch (rs->state) { 1737 case 0: 1738 l = 4 - rs->index; 1739 if (l > size) { 1740 l = size; 1741 } 1742 memcpy(rs->buf + rs->index, buf, l); 1743 buf += l; 1744 size -= l; 1745 rs->index += l; 1746 if (rs->index == 4) { 1747 /* got length */ 1748 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1749 rs->index = 0; 1750 if (rs->vnet_hdr) { 1751 rs->state = 1; 1752 } else { 1753 rs->state = 2; 1754 rs->vnet_hdr_len = 0; 1755 } 1756 } 1757 break; 1758 case 1: 1759 l = 4 - rs->index; 1760 if (l > size) { 1761 l = size; 1762 } 1763 memcpy(rs->buf + rs->index, buf, l); 1764 buf += l; 1765 size -= l; 1766 rs->index += l; 1767 if (rs->index == 4) { 1768 /* got vnet header length */ 1769 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1770 rs->index = 0; 1771 rs->state = 2; 1772 } 1773 break; 1774 case 2: 1775 l = rs->packet_len - rs->index; 1776 if (l > size) { 1777 l = size; 1778 } 1779 if (rs->index + l <= sizeof(rs->buf)) { 1780 memcpy(rs->buf + rs->index, buf, l); 1781 } else { 1782 fprintf(stderr, "serious error: oversized packet received," 1783 "connection terminated.\n"); 1784 rs->index = rs->state = 0; 1785 return -1; 1786 } 1787 1788 rs->index += l; 1789 buf += l; 1790 size -= l; 1791 if (rs->index >= rs->packet_len) { 1792 rs->index = 0; 1793 rs->state = 0; 1794 assert(rs->finalize); 1795 rs->finalize(rs); 1796 } 1797 break; 1798 } 1799 } 1800 1801 assert(size == 0); 1802 return 0; 1803 } 1804