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 "net/slirp.h" 31 #include "net/eth.h" 32 #include "util.h" 33 34 #include "monitor/monitor.h" 35 #include "qemu/help_option.h" 36 #include "qapi/qapi-commands-net.h" 37 #include "qapi/qapi-visit-net.h" 38 #include "qapi/qmp/qdict.h" 39 #include "qapi/qmp/qerror.h" 40 #include "qemu/error-report.h" 41 #include "qemu/sockets.h" 42 #include "qemu/cutils.h" 43 #include "qemu/config-file.h" 44 #include "qemu/ctype.h" 45 #include "hw/qdev.h" 46 #include "qemu/iov.h" 47 #include "qemu/main-loop.h" 48 #include "qemu/option.h" 49 #include "qapi/error.h" 50 #include "qapi/opts-visitor.h" 51 #include "sysemu/sysemu.h" 52 #include "sysemu/qtest.h" 53 #include "net/filter.h" 54 #include "qapi/string-output-visitor.h" 55 56 /* Net bridge is currently not supported for W32. */ 57 #if !defined(_WIN32) 58 # define CONFIG_NET_BRIDGE 59 #endif 60 61 static VMChangeStateEntry *net_change_state_entry; 62 static QTAILQ_HEAD(, NetClientState) net_clients; 63 64 /***********************************************************/ 65 /* network device redirectors */ 66 67 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 68 { 69 const char *p, *p1; 70 int len; 71 p = *pp; 72 p1 = strchr(p, sep); 73 if (!p1) 74 return -1; 75 len = p1 - p; 76 p1++; 77 if (buf_size > 0) { 78 if (len > buf_size - 1) 79 len = buf_size - 1; 80 memcpy(buf, p, len); 81 buf[len] = '\0'; 82 } 83 *pp = p1; 84 return 0; 85 } 86 87 int parse_host_port(struct sockaddr_in *saddr, const char *str, 88 Error **errp) 89 { 90 char buf[512]; 91 struct hostent *he; 92 const char *p, *r; 93 int port; 94 95 p = str; 96 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 97 error_setg(errp, "host address '%s' doesn't contain ':' " 98 "separating host from port", str); 99 return -1; 100 } 101 saddr->sin_family = AF_INET; 102 if (buf[0] == '\0') { 103 saddr->sin_addr.s_addr = 0; 104 } else { 105 if (qemu_isdigit(buf[0])) { 106 if (!inet_aton(buf, &saddr->sin_addr)) { 107 error_setg(errp, "host address '%s' is not a valid " 108 "IPv4 address", buf); 109 return -1; 110 } 111 } else { 112 he = gethostbyname(buf); 113 if (he == NULL) { 114 error_setg(errp, "can't resolve host address '%s'", buf); 115 return - 1; 116 } 117 saddr->sin_addr = *(struct in_addr *)he->h_addr; 118 } 119 } 120 port = strtol(p, (char **)&r, 0); 121 if (r == p) { 122 error_setg(errp, "port number '%s' is invalid", p); 123 return -1; 124 } 125 saddr->sin_port = htons(port); 126 return 0; 127 } 128 129 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 130 { 131 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 132 macaddr[0], macaddr[1], macaddr[2], 133 macaddr[3], macaddr[4], macaddr[5]); 134 } 135 136 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 137 { 138 snprintf(nc->info_str, sizeof(nc->info_str), 139 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 140 nc->model, 141 macaddr[0], macaddr[1], macaddr[2], 142 macaddr[3], macaddr[4], macaddr[5]); 143 } 144 145 static int mac_table[256] = {0}; 146 147 static void qemu_macaddr_set_used(MACAddr *macaddr) 148 { 149 int index; 150 151 for (index = 0x56; index < 0xFF; index++) { 152 if (macaddr->a[5] == index) { 153 mac_table[index]++; 154 } 155 } 156 } 157 158 static void qemu_macaddr_set_free(MACAddr *macaddr) 159 { 160 int index; 161 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 162 163 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 164 return; 165 } 166 for (index = 0x56; index < 0xFF; index++) { 167 if (macaddr->a[5] == index) { 168 mac_table[index]--; 169 } 170 } 171 } 172 173 static int qemu_macaddr_get_free(void) 174 { 175 int index; 176 177 for (index = 0x56; index < 0xFF; index++) { 178 if (mac_table[index] == 0) { 179 return index; 180 } 181 } 182 183 return -1; 184 } 185 186 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 187 { 188 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 189 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 190 191 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 192 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 193 return; 194 } else { 195 qemu_macaddr_set_used(macaddr); 196 return; 197 } 198 } 199 200 macaddr->a[0] = 0x52; 201 macaddr->a[1] = 0x54; 202 macaddr->a[2] = 0x00; 203 macaddr->a[3] = 0x12; 204 macaddr->a[4] = 0x34; 205 macaddr->a[5] = qemu_macaddr_get_free(); 206 qemu_macaddr_set_used(macaddr); 207 } 208 209 /** 210 * Generate a name for net client 211 * 212 * Only net clients created with the legacy -net option and NICs need this. 213 */ 214 static char *assign_name(NetClientState *nc1, const char *model) 215 { 216 NetClientState *nc; 217 int id = 0; 218 219 QTAILQ_FOREACH(nc, &net_clients, next) { 220 if (nc == nc1) { 221 continue; 222 } 223 if (strcmp(nc->model, model) == 0) { 224 id++; 225 } 226 } 227 228 return g_strdup_printf("%s.%d", model, id); 229 } 230 231 static void qemu_net_client_destructor(NetClientState *nc) 232 { 233 g_free(nc); 234 } 235 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 236 unsigned flags, 237 const struct iovec *iov, 238 int iovcnt, 239 void *opaque); 240 241 static void qemu_net_client_setup(NetClientState *nc, 242 NetClientInfo *info, 243 NetClientState *peer, 244 const char *model, 245 const char *name, 246 NetClientDestructor *destructor) 247 { 248 nc->info = info; 249 nc->model = g_strdup(model); 250 if (name) { 251 nc->name = g_strdup(name); 252 } else { 253 nc->name = assign_name(nc, model); 254 } 255 256 if (peer) { 257 assert(!peer->peer); 258 nc->peer = peer; 259 peer->peer = nc; 260 } 261 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 262 263 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 264 nc->destructor = destructor; 265 QTAILQ_INIT(&nc->filters); 266 } 267 268 NetClientState *qemu_new_net_client(NetClientInfo *info, 269 NetClientState *peer, 270 const char *model, 271 const char *name) 272 { 273 NetClientState *nc; 274 275 assert(info->size >= sizeof(NetClientState)); 276 277 nc = g_malloc0(info->size); 278 qemu_net_client_setup(nc, info, peer, model, name, 279 qemu_net_client_destructor); 280 281 return nc; 282 } 283 284 NICState *qemu_new_nic(NetClientInfo *info, 285 NICConf *conf, 286 const char *model, 287 const char *name, 288 void *opaque) 289 { 290 NetClientState **peers = conf->peers.ncs; 291 NICState *nic; 292 int i, queues = MAX(1, conf->peers.queues); 293 294 assert(info->type == NET_CLIENT_DRIVER_NIC); 295 assert(info->size >= sizeof(NICState)); 296 297 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 298 nic->ncs = (void *)nic + info->size; 299 nic->conf = conf; 300 nic->opaque = opaque; 301 302 for (i = 0; i < queues; i++) { 303 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 304 NULL); 305 nic->ncs[i].queue_index = i; 306 } 307 308 return nic; 309 } 310 311 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 312 { 313 return nic->ncs + queue_index; 314 } 315 316 NetClientState *qemu_get_queue(NICState *nic) 317 { 318 return qemu_get_subqueue(nic, 0); 319 } 320 321 NICState *qemu_get_nic(NetClientState *nc) 322 { 323 NetClientState *nc0 = nc - nc->queue_index; 324 325 return (NICState *)((void *)nc0 - nc->info->size); 326 } 327 328 void *qemu_get_nic_opaque(NetClientState *nc) 329 { 330 NICState *nic = qemu_get_nic(nc); 331 332 return nic->opaque; 333 } 334 335 static void qemu_cleanup_net_client(NetClientState *nc) 336 { 337 QTAILQ_REMOVE(&net_clients, nc, next); 338 339 if (nc->info->cleanup) { 340 nc->info->cleanup(nc); 341 } 342 } 343 344 static void qemu_free_net_client(NetClientState *nc) 345 { 346 if (nc->incoming_queue) { 347 qemu_del_net_queue(nc->incoming_queue); 348 } 349 if (nc->peer) { 350 nc->peer->peer = NULL; 351 } 352 g_free(nc->name); 353 g_free(nc->model); 354 if (nc->destructor) { 355 nc->destructor(nc); 356 } 357 } 358 359 void qemu_del_net_client(NetClientState *nc) 360 { 361 NetClientState *ncs[MAX_QUEUE_NUM]; 362 int queues, i; 363 NetFilterState *nf, *next; 364 365 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 366 367 /* If the NetClientState belongs to a multiqueue backend, we will change all 368 * other NetClientStates also. 369 */ 370 queues = qemu_find_net_clients_except(nc->name, ncs, 371 NET_CLIENT_DRIVER_NIC, 372 MAX_QUEUE_NUM); 373 assert(queues != 0); 374 375 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 376 object_unparent(OBJECT(nf)); 377 } 378 379 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 380 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 381 NICState *nic = qemu_get_nic(nc->peer); 382 if (nic->peer_deleted) { 383 return; 384 } 385 nic->peer_deleted = true; 386 387 for (i = 0; i < queues; i++) { 388 ncs[i]->peer->link_down = true; 389 } 390 391 if (nc->peer->info->link_status_changed) { 392 nc->peer->info->link_status_changed(nc->peer); 393 } 394 395 for (i = 0; i < queues; i++) { 396 qemu_cleanup_net_client(ncs[i]); 397 } 398 399 return; 400 } 401 402 for (i = 0; i < queues; i++) { 403 qemu_cleanup_net_client(ncs[i]); 404 qemu_free_net_client(ncs[i]); 405 } 406 } 407 408 void qemu_del_nic(NICState *nic) 409 { 410 int i, queues = MAX(nic->conf->peers.queues, 1); 411 412 qemu_macaddr_set_free(&nic->conf->macaddr); 413 414 /* If this is a peer NIC and peer has already been deleted, free it now. */ 415 if (nic->peer_deleted) { 416 for (i = 0; i < queues; i++) { 417 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 418 } 419 } 420 421 for (i = queues - 1; i >= 0; i--) { 422 NetClientState *nc = qemu_get_subqueue(nic, i); 423 424 qemu_cleanup_net_client(nc); 425 qemu_free_net_client(nc); 426 } 427 428 g_free(nic); 429 } 430 431 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 432 { 433 NetClientState *nc; 434 435 QTAILQ_FOREACH(nc, &net_clients, next) { 436 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 437 if (nc->queue_index == 0) { 438 func(qemu_get_nic(nc), opaque); 439 } 440 } 441 } 442 } 443 444 bool qemu_has_ufo(NetClientState *nc) 445 { 446 if (!nc || !nc->info->has_ufo) { 447 return false; 448 } 449 450 return nc->info->has_ufo(nc); 451 } 452 453 bool qemu_has_vnet_hdr(NetClientState *nc) 454 { 455 if (!nc || !nc->info->has_vnet_hdr) { 456 return false; 457 } 458 459 return nc->info->has_vnet_hdr(nc); 460 } 461 462 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 463 { 464 if (!nc || !nc->info->has_vnet_hdr_len) { 465 return false; 466 } 467 468 return nc->info->has_vnet_hdr_len(nc, len); 469 } 470 471 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 472 { 473 if (!nc || !nc->info->using_vnet_hdr) { 474 return; 475 } 476 477 nc->info->using_vnet_hdr(nc, enable); 478 } 479 480 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 481 int ecn, int ufo) 482 { 483 if (!nc || !nc->info->set_offload) { 484 return; 485 } 486 487 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 488 } 489 490 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 491 { 492 if (!nc || !nc->info->set_vnet_hdr_len) { 493 return; 494 } 495 496 nc->vnet_hdr_len = len; 497 nc->info->set_vnet_hdr_len(nc, len); 498 } 499 500 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 501 { 502 #ifdef HOST_WORDS_BIGENDIAN 503 if (!nc || !nc->info->set_vnet_le) { 504 return -ENOSYS; 505 } 506 507 return nc->info->set_vnet_le(nc, is_le); 508 #else 509 return 0; 510 #endif 511 } 512 513 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 514 { 515 #ifdef HOST_WORDS_BIGENDIAN 516 return 0; 517 #else 518 if (!nc || !nc->info->set_vnet_be) { 519 return -ENOSYS; 520 } 521 522 return nc->info->set_vnet_be(nc, is_be); 523 #endif 524 } 525 526 int qemu_can_send_packet(NetClientState *sender) 527 { 528 int vm_running = runstate_is_running(); 529 530 if (!vm_running) { 531 return 0; 532 } 533 534 if (!sender->peer) { 535 return 1; 536 } 537 538 if (sender->peer->receive_disabled) { 539 return 0; 540 } else if (sender->peer->info->can_receive && 541 !sender->peer->info->can_receive(sender->peer)) { 542 return 0; 543 } 544 return 1; 545 } 546 547 static ssize_t filter_receive_iov(NetClientState *nc, 548 NetFilterDirection direction, 549 NetClientState *sender, 550 unsigned flags, 551 const struct iovec *iov, 552 int iovcnt, 553 NetPacketSent *sent_cb) 554 { 555 ssize_t ret = 0; 556 NetFilterState *nf = NULL; 557 558 if (direction == NET_FILTER_DIRECTION_TX) { 559 QTAILQ_FOREACH(nf, &nc->filters, next) { 560 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 561 iovcnt, sent_cb); 562 if (ret) { 563 return ret; 564 } 565 } 566 } else { 567 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 568 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 569 iovcnt, sent_cb); 570 if (ret) { 571 return ret; 572 } 573 } 574 } 575 576 return ret; 577 } 578 579 static ssize_t filter_receive(NetClientState *nc, 580 NetFilterDirection direction, 581 NetClientState *sender, 582 unsigned flags, 583 const uint8_t *data, 584 size_t size, 585 NetPacketSent *sent_cb) 586 { 587 struct iovec iov = { 588 .iov_base = (void *)data, 589 .iov_len = size 590 }; 591 592 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 593 } 594 595 void qemu_purge_queued_packets(NetClientState *nc) 596 { 597 if (!nc->peer) { 598 return; 599 } 600 601 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 602 } 603 604 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 605 { 606 nc->receive_disabled = 0; 607 608 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 609 if (net_hub_flush(nc->peer)) { 610 qemu_notify_event(); 611 } 612 } 613 if (qemu_net_queue_flush(nc->incoming_queue)) { 614 /* We emptied the queue successfully, signal to the IO thread to repoll 615 * the file descriptor (for tap, for example). 616 */ 617 qemu_notify_event(); 618 } else if (purge) { 619 /* Unable to empty the queue, purge remaining packets */ 620 qemu_net_queue_purge(nc->incoming_queue, nc); 621 } 622 } 623 624 void qemu_flush_queued_packets(NetClientState *nc) 625 { 626 qemu_flush_or_purge_queued_packets(nc, false); 627 } 628 629 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 630 unsigned flags, 631 const uint8_t *buf, int size, 632 NetPacketSent *sent_cb) 633 { 634 NetQueue *queue; 635 int ret; 636 637 #ifdef DEBUG_NET 638 printf("qemu_send_packet_async:\n"); 639 qemu_hexdump((const char *)buf, stdout, "net", size); 640 #endif 641 642 if (sender->link_down || !sender->peer) { 643 return size; 644 } 645 646 /* Let filters handle the packet first */ 647 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 648 sender, flags, buf, size, sent_cb); 649 if (ret) { 650 return ret; 651 } 652 653 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 654 sender, flags, buf, size, sent_cb); 655 if (ret) { 656 return ret; 657 } 658 659 queue = sender->peer->incoming_queue; 660 661 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 662 } 663 664 ssize_t qemu_send_packet_async(NetClientState *sender, 665 const uint8_t *buf, int size, 666 NetPacketSent *sent_cb) 667 { 668 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 669 buf, size, sent_cb); 670 } 671 672 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 673 { 674 return qemu_send_packet_async(nc, buf, size, NULL); 675 } 676 677 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 678 { 679 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 680 buf, size, NULL); 681 } 682 683 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 684 int iovcnt, unsigned flags) 685 { 686 uint8_t *buf = NULL; 687 uint8_t *buffer; 688 size_t offset; 689 ssize_t ret; 690 691 if (iovcnt == 1) { 692 buffer = iov[0].iov_base; 693 offset = iov[0].iov_len; 694 } else { 695 offset = iov_size(iov, iovcnt); 696 if (offset > NET_BUFSIZE) { 697 return -1; 698 } 699 buf = g_malloc(offset); 700 buffer = buf; 701 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 702 } 703 704 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 705 ret = nc->info->receive_raw(nc, buffer, offset); 706 } else { 707 ret = nc->info->receive(nc, buffer, offset); 708 } 709 710 g_free(buf); 711 return ret; 712 } 713 714 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 715 unsigned flags, 716 const struct iovec *iov, 717 int iovcnt, 718 void *opaque) 719 { 720 NetClientState *nc = opaque; 721 int ret; 722 723 724 if (nc->link_down) { 725 return iov_size(iov, iovcnt); 726 } 727 728 if (nc->receive_disabled) { 729 return 0; 730 } 731 732 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 733 ret = nc->info->receive_iov(nc, iov, iovcnt); 734 } else { 735 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 736 } 737 738 if (ret == 0) { 739 nc->receive_disabled = 1; 740 } 741 742 return ret; 743 } 744 745 ssize_t qemu_sendv_packet_async(NetClientState *sender, 746 const struct iovec *iov, int iovcnt, 747 NetPacketSent *sent_cb) 748 { 749 NetQueue *queue; 750 size_t size = iov_size(iov, iovcnt); 751 int ret; 752 753 if (size > NET_BUFSIZE) { 754 return size; 755 } 756 757 if (sender->link_down || !sender->peer) { 758 return size; 759 } 760 761 /* Let filters handle the packet first */ 762 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 763 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 764 if (ret) { 765 return ret; 766 } 767 768 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 769 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 770 if (ret) { 771 return ret; 772 } 773 774 queue = sender->peer->incoming_queue; 775 776 return qemu_net_queue_send_iov(queue, sender, 777 QEMU_NET_PACKET_FLAG_NONE, 778 iov, iovcnt, sent_cb); 779 } 780 781 ssize_t 782 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 783 { 784 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 785 } 786 787 NetClientState *qemu_find_netdev(const char *id) 788 { 789 NetClientState *nc; 790 791 QTAILQ_FOREACH(nc, &net_clients, next) { 792 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 793 continue; 794 if (!strcmp(nc->name, id)) { 795 return nc; 796 } 797 } 798 799 return NULL; 800 } 801 802 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 803 NetClientDriver type, int max) 804 { 805 NetClientState *nc; 806 int ret = 0; 807 808 QTAILQ_FOREACH(nc, &net_clients, next) { 809 if (nc->info->type == type) { 810 continue; 811 } 812 if (!id || !strcmp(nc->name, id)) { 813 if (ret < max) { 814 ncs[ret] = nc; 815 } 816 ret++; 817 } 818 } 819 820 return ret; 821 } 822 823 static int nic_get_free_idx(void) 824 { 825 int index; 826 827 for (index = 0; index < MAX_NICS; index++) 828 if (!nd_table[index].used) 829 return index; 830 return -1; 831 } 832 833 int qemu_show_nic_models(const char *arg, const char *const *models) 834 { 835 int i; 836 837 if (!arg || !is_help_option(arg)) { 838 return 0; 839 } 840 841 printf("Supported NIC models:\n"); 842 for (i = 0 ; models[i]; i++) { 843 printf("%s\n", models[i]); 844 } 845 return 1; 846 } 847 848 void qemu_check_nic_model(NICInfo *nd, const char *model) 849 { 850 const char *models[2]; 851 852 models[0] = model; 853 models[1] = NULL; 854 855 if (qemu_show_nic_models(nd->model, models)) 856 exit(0); 857 if (qemu_find_nic_model(nd, models, model) < 0) 858 exit(1); 859 } 860 861 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 862 const char *default_model) 863 { 864 int i; 865 866 if (!nd->model) 867 nd->model = g_strdup(default_model); 868 869 for (i = 0 ; models[i]; i++) { 870 if (strcmp(nd->model, models[i]) == 0) 871 return i; 872 } 873 874 error_report("Unsupported NIC model: %s", nd->model); 875 return -1; 876 } 877 878 static int net_init_nic(const Netdev *netdev, const char *name, 879 NetClientState *peer, Error **errp) 880 { 881 int idx; 882 NICInfo *nd; 883 const NetLegacyNicOptions *nic; 884 885 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 886 nic = &netdev->u.nic; 887 888 idx = nic_get_free_idx(); 889 if (idx == -1 || nb_nics >= MAX_NICS) { 890 error_setg(errp, "too many NICs"); 891 return -1; 892 } 893 894 nd = &nd_table[idx]; 895 896 memset(nd, 0, sizeof(*nd)); 897 898 if (nic->has_netdev) { 899 nd->netdev = qemu_find_netdev(nic->netdev); 900 if (!nd->netdev) { 901 error_setg(errp, "netdev '%s' not found", nic->netdev); 902 return -1; 903 } 904 } else { 905 assert(peer); 906 nd->netdev = peer; 907 } 908 nd->name = g_strdup(name); 909 if (nic->has_model) { 910 nd->model = g_strdup(nic->model); 911 } 912 if (nic->has_addr) { 913 nd->devaddr = g_strdup(nic->addr); 914 } 915 916 if (nic->has_macaddr && 917 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 918 error_setg(errp, "invalid syntax for ethernet address"); 919 return -1; 920 } 921 if (nic->has_macaddr && 922 is_multicast_ether_addr(nd->macaddr.a)) { 923 error_setg(errp, 924 "NIC cannot have multicast MAC address (odd 1st byte)"); 925 return -1; 926 } 927 qemu_macaddr_default_if_unset(&nd->macaddr); 928 929 if (nic->has_vectors) { 930 if (nic->vectors > 0x7ffffff) { 931 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 932 return -1; 933 } 934 nd->nvectors = nic->vectors; 935 } else { 936 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 937 } 938 939 nd->used = 1; 940 nb_nics++; 941 942 return idx; 943 } 944 945 946 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 947 const Netdev *netdev, 948 const char *name, 949 NetClientState *peer, Error **errp) = { 950 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 951 #ifdef CONFIG_SLIRP 952 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 953 #endif 954 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 955 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 956 #ifdef CONFIG_VDE 957 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 958 #endif 959 #ifdef CONFIG_NETMAP 960 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 961 #endif 962 #ifdef CONFIG_NET_BRIDGE 963 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 964 #endif 965 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 966 #ifdef CONFIG_VHOST_NET_USER 967 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 968 #endif 969 #ifdef CONFIG_L2TPV3 970 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 971 #endif 972 }; 973 974 975 static int net_client_init1(const void *object, bool is_netdev, Error **errp) 976 { 977 Netdev legacy = {0}; 978 const Netdev *netdev; 979 const char *name; 980 NetClientState *peer = NULL; 981 982 if (is_netdev) { 983 netdev = object; 984 name = netdev->id; 985 986 if (netdev->type == NET_CLIENT_DRIVER_NIC || 987 !net_client_init_fun[netdev->type]) { 988 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 989 "a netdev backend type"); 990 return -1; 991 } 992 } else { 993 const NetLegacy *net = object; 994 const NetLegacyOptions *opts = net->opts; 995 legacy.id = net->id; 996 netdev = &legacy; 997 /* missing optional values have been initialized to "all bits zero" */ 998 name = net->has_id ? net->id : net->name; 999 1000 if (net->has_name) { 1001 warn_report("The 'name' parameter is deprecated, use 'id' instead"); 1002 } 1003 1004 /* Map the old options to the new flat type */ 1005 switch (opts->type) { 1006 case NET_LEGACY_OPTIONS_TYPE_NONE: 1007 return 0; /* nothing to do */ 1008 case NET_LEGACY_OPTIONS_TYPE_NIC: 1009 legacy.type = NET_CLIENT_DRIVER_NIC; 1010 legacy.u.nic = opts->u.nic; 1011 break; 1012 case NET_LEGACY_OPTIONS_TYPE_USER: 1013 legacy.type = NET_CLIENT_DRIVER_USER; 1014 legacy.u.user = opts->u.user; 1015 break; 1016 case NET_LEGACY_OPTIONS_TYPE_TAP: 1017 legacy.type = NET_CLIENT_DRIVER_TAP; 1018 legacy.u.tap = opts->u.tap; 1019 break; 1020 case NET_LEGACY_OPTIONS_TYPE_L2TPV3: 1021 legacy.type = NET_CLIENT_DRIVER_L2TPV3; 1022 legacy.u.l2tpv3 = opts->u.l2tpv3; 1023 break; 1024 case NET_LEGACY_OPTIONS_TYPE_SOCKET: 1025 legacy.type = NET_CLIENT_DRIVER_SOCKET; 1026 legacy.u.socket = opts->u.socket; 1027 break; 1028 case NET_LEGACY_OPTIONS_TYPE_VDE: 1029 legacy.type = NET_CLIENT_DRIVER_VDE; 1030 legacy.u.vde = opts->u.vde; 1031 break; 1032 case NET_LEGACY_OPTIONS_TYPE_BRIDGE: 1033 legacy.type = NET_CLIENT_DRIVER_BRIDGE; 1034 legacy.u.bridge = opts->u.bridge; 1035 break; 1036 case NET_LEGACY_OPTIONS_TYPE_NETMAP: 1037 legacy.type = NET_CLIENT_DRIVER_NETMAP; 1038 legacy.u.netmap = opts->u.netmap; 1039 break; 1040 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER: 1041 legacy.type = NET_CLIENT_DRIVER_VHOST_USER; 1042 legacy.u.vhost_user = opts->u.vhost_user; 1043 break; 1044 default: 1045 abort(); 1046 } 1047 1048 if (!net_client_init_fun[netdev->type]) { 1049 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1050 "a net backend type (maybe it is not compiled " 1051 "into this binary)"); 1052 return -1; 1053 } 1054 1055 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1056 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1057 !opts->u.nic.has_netdev) { 1058 peer = net_hub_add_port(0, NULL, NULL); 1059 } 1060 } 1061 1062 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) { 1063 /* FIXME drop when all init functions store an Error */ 1064 if (errp && !*errp) { 1065 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1066 NetClientDriver_str(netdev->type)); 1067 } 1068 return -1; 1069 } 1070 return 0; 1071 } 1072 1073 static void show_netdevs(void) 1074 { 1075 int idx; 1076 const char *available_netdevs[] = { 1077 "socket", 1078 "hubport", 1079 "tap", 1080 #ifdef CONFIG_SLIRP 1081 "user", 1082 #endif 1083 #ifdef CONFIG_L2TPV3 1084 "l2tpv3", 1085 #endif 1086 #ifdef CONFIG_VDE 1087 "vde", 1088 #endif 1089 #ifdef CONFIG_NET_BRIDGE 1090 "bridge", 1091 #endif 1092 #ifdef CONFIG_NETMAP 1093 "netmap", 1094 #endif 1095 #ifdef CONFIG_POSIX 1096 "vhost-user", 1097 #endif 1098 }; 1099 1100 printf("Available netdev backend types:\n"); 1101 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1102 puts(available_netdevs[idx]); 1103 } 1104 } 1105 1106 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1107 { 1108 void *object = NULL; 1109 Error *err = NULL; 1110 int ret = -1; 1111 Visitor *v = opts_visitor_new(opts); 1112 1113 const char *type = qemu_opt_get(opts, "type"); 1114 1115 if (is_netdev && type && is_help_option(type)) { 1116 show_netdevs(); 1117 exit(0); 1118 } else { 1119 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1120 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1121 1122 if (ip6_net) { 1123 char buf[strlen(ip6_net) + 1]; 1124 1125 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) { 1126 /* Default 64bit prefix length. */ 1127 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort); 1128 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort); 1129 } else { 1130 /* User-specified prefix length. */ 1131 unsigned long len; 1132 int err; 1133 1134 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort); 1135 err = qemu_strtoul(ip6_net, NULL, 10, &len); 1136 1137 if (err) { 1138 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1139 "ipv6-prefix", "a number"); 1140 } else { 1141 qemu_opt_set_number(opts, "ipv6-prefixlen", len, 1142 &error_abort); 1143 } 1144 } 1145 qemu_opt_unset(opts, "ipv6-net"); 1146 } 1147 } 1148 1149 if (is_netdev) { 1150 visit_type_Netdev(v, NULL, (Netdev **)&object, &err); 1151 } else { 1152 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err); 1153 } 1154 1155 if (!err) { 1156 ret = net_client_init1(object, is_netdev, &err); 1157 } 1158 1159 if (is_netdev) { 1160 qapi_free_Netdev(object); 1161 } else { 1162 qapi_free_NetLegacy(object); 1163 } 1164 1165 error_propagate(errp, err); 1166 visit_free(v); 1167 return ret; 1168 } 1169 1170 void netdev_add(QemuOpts *opts, Error **errp) 1171 { 1172 net_client_init(opts, true, errp); 1173 } 1174 1175 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1176 { 1177 Error *local_err = NULL; 1178 QemuOptsList *opts_list; 1179 QemuOpts *opts; 1180 1181 opts_list = qemu_find_opts_err("netdev", &local_err); 1182 if (local_err) { 1183 goto out; 1184 } 1185 1186 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1187 if (local_err) { 1188 goto out; 1189 } 1190 1191 netdev_add(opts, &local_err); 1192 if (local_err) { 1193 qemu_opts_del(opts); 1194 goto out; 1195 } 1196 1197 out: 1198 error_propagate(errp, local_err); 1199 } 1200 1201 void qmp_netdev_del(const char *id, Error **errp) 1202 { 1203 NetClientState *nc; 1204 QemuOpts *opts; 1205 1206 nc = qemu_find_netdev(id); 1207 if (!nc) { 1208 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1209 "Device '%s' not found", id); 1210 return; 1211 } 1212 1213 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1214 if (!opts) { 1215 error_setg(errp, "Device '%s' is not a netdev", id); 1216 return; 1217 } 1218 1219 qemu_del_net_client(nc); 1220 qemu_opts_del(opts); 1221 } 1222 1223 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1224 { 1225 char *str; 1226 ObjectProperty *prop; 1227 ObjectPropertyIterator iter; 1228 Visitor *v; 1229 1230 /* generate info str */ 1231 object_property_iter_init(&iter, OBJECT(nf)); 1232 while ((prop = object_property_iter_next(&iter))) { 1233 if (!strcmp(prop->name, "type")) { 1234 continue; 1235 } 1236 v = string_output_visitor_new(false, &str); 1237 object_property_get(OBJECT(nf), v, prop->name, NULL); 1238 visit_complete(v, &str); 1239 visit_free(v); 1240 monitor_printf(mon, ",%s=%s", prop->name, str); 1241 g_free(str); 1242 } 1243 monitor_printf(mon, "\n"); 1244 } 1245 1246 void print_net_client(Monitor *mon, NetClientState *nc) 1247 { 1248 NetFilterState *nf; 1249 1250 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1251 nc->queue_index, 1252 NetClientDriver_str(nc->info->type), 1253 nc->info_str); 1254 if (!QTAILQ_EMPTY(&nc->filters)) { 1255 monitor_printf(mon, "filters:\n"); 1256 } 1257 QTAILQ_FOREACH(nf, &nc->filters, next) { 1258 char *path = object_get_canonical_path_component(OBJECT(nf)); 1259 1260 monitor_printf(mon, " - %s: type=%s", path, 1261 object_get_typename(OBJECT(nf))); 1262 netfilter_print_info(mon, nf); 1263 g_free(path); 1264 } 1265 } 1266 1267 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1268 Error **errp) 1269 { 1270 NetClientState *nc; 1271 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1272 1273 QTAILQ_FOREACH(nc, &net_clients, next) { 1274 RxFilterInfoList *entry; 1275 RxFilterInfo *info; 1276 1277 if (has_name && strcmp(nc->name, name) != 0) { 1278 continue; 1279 } 1280 1281 /* only query rx-filter information of NIC */ 1282 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1283 if (has_name) { 1284 error_setg(errp, "net client(%s) isn't a NIC", name); 1285 return NULL; 1286 } 1287 continue; 1288 } 1289 1290 /* only query information on queue 0 since the info is per nic, 1291 * not per queue 1292 */ 1293 if (nc->queue_index != 0) 1294 continue; 1295 1296 if (nc->info->query_rx_filter) { 1297 info = nc->info->query_rx_filter(nc); 1298 entry = g_malloc0(sizeof(*entry)); 1299 entry->value = info; 1300 1301 if (!filter_list) { 1302 filter_list = entry; 1303 } else { 1304 last_entry->next = entry; 1305 } 1306 last_entry = entry; 1307 } else if (has_name) { 1308 error_setg(errp, "net client(%s) doesn't support" 1309 " rx-filter querying", name); 1310 return NULL; 1311 } 1312 1313 if (has_name) { 1314 break; 1315 } 1316 } 1317 1318 if (filter_list == NULL && has_name) { 1319 error_setg(errp, "invalid net client name: %s", name); 1320 } 1321 1322 return filter_list; 1323 } 1324 1325 void hmp_info_network(Monitor *mon, const QDict *qdict) 1326 { 1327 NetClientState *nc, *peer; 1328 NetClientDriver type; 1329 1330 net_hub_info(mon); 1331 1332 QTAILQ_FOREACH(nc, &net_clients, next) { 1333 peer = nc->peer; 1334 type = nc->info->type; 1335 1336 /* Skip if already printed in hub info */ 1337 if (net_hub_id_for_client(nc, NULL) == 0) { 1338 continue; 1339 } 1340 1341 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1342 print_net_client(mon, nc); 1343 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1344 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1345 monitor_printf(mon, " \\ "); 1346 print_net_client(mon, peer); 1347 } 1348 } 1349 } 1350 1351 void colo_notify_filters_event(int event, Error **errp) 1352 { 1353 NetClientState *nc; 1354 NetFilterState *nf; 1355 NetFilterClass *nfc = NULL; 1356 Error *local_err = NULL; 1357 1358 QTAILQ_FOREACH(nc, &net_clients, next) { 1359 QTAILQ_FOREACH(nf, &nc->filters, next) { 1360 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1361 nfc->handle_event(nf, event, &local_err); 1362 if (local_err) { 1363 error_propagate(errp, local_err); 1364 return; 1365 } 1366 } 1367 } 1368 } 1369 1370 void qmp_set_link(const char *name, bool up, Error **errp) 1371 { 1372 NetClientState *ncs[MAX_QUEUE_NUM]; 1373 NetClientState *nc; 1374 int queues, i; 1375 1376 queues = qemu_find_net_clients_except(name, ncs, 1377 NET_CLIENT_DRIVER__MAX, 1378 MAX_QUEUE_NUM); 1379 1380 if (queues == 0) { 1381 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1382 "Device '%s' not found", name); 1383 return; 1384 } 1385 nc = ncs[0]; 1386 1387 for (i = 0; i < queues; i++) { 1388 ncs[i]->link_down = !up; 1389 } 1390 1391 if (nc->info->link_status_changed) { 1392 nc->info->link_status_changed(nc); 1393 } 1394 1395 if (nc->peer) { 1396 /* Change peer link only if the peer is NIC and then notify peer. 1397 * If the peer is a HUBPORT or a backend, we do not change the 1398 * link status. 1399 * 1400 * This behavior is compatible with qemu hubs where there could be 1401 * multiple clients that can still communicate with each other in 1402 * disconnected mode. For now maintain this compatibility. 1403 */ 1404 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1405 for (i = 0; i < queues; i++) { 1406 ncs[i]->peer->link_down = !up; 1407 } 1408 } 1409 if (nc->peer->info->link_status_changed) { 1410 nc->peer->info->link_status_changed(nc->peer); 1411 } 1412 } 1413 } 1414 1415 static void net_vm_change_state_handler(void *opaque, int running, 1416 RunState state) 1417 { 1418 NetClientState *nc; 1419 NetClientState *tmp; 1420 1421 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1422 if (running) { 1423 /* Flush queued packets and wake up backends. */ 1424 if (nc->peer && qemu_can_send_packet(nc)) { 1425 qemu_flush_queued_packets(nc->peer); 1426 } 1427 } else { 1428 /* Complete all queued packets, to guarantee we don't modify 1429 * state later when VM is not running. 1430 */ 1431 qemu_flush_or_purge_queued_packets(nc, true); 1432 } 1433 } 1434 } 1435 1436 void net_cleanup(void) 1437 { 1438 NetClientState *nc; 1439 1440 /* We may del multiple entries during qemu_del_net_client(), 1441 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1442 */ 1443 while (!QTAILQ_EMPTY(&net_clients)) { 1444 nc = QTAILQ_FIRST(&net_clients); 1445 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1446 qemu_del_nic(qemu_get_nic(nc)); 1447 } else { 1448 qemu_del_net_client(nc); 1449 } 1450 } 1451 1452 qemu_del_vm_change_state_handler(net_change_state_entry); 1453 } 1454 1455 void net_check_clients(void) 1456 { 1457 NetClientState *nc; 1458 int i; 1459 1460 net_hub_check_clients(); 1461 1462 QTAILQ_FOREACH(nc, &net_clients, next) { 1463 if (!nc->peer) { 1464 warn_report("%s %s has no peer", 1465 nc->info->type == NET_CLIENT_DRIVER_NIC 1466 ? "nic" : "netdev", 1467 nc->name); 1468 } 1469 } 1470 1471 /* Check that all NICs requested via -net nic actually got created. 1472 * NICs created via -device don't need to be checked here because 1473 * they are always instantiated. 1474 */ 1475 for (i = 0; i < MAX_NICS; i++) { 1476 NICInfo *nd = &nd_table[i]; 1477 if (nd->used && !nd->instantiated) { 1478 warn_report("requested NIC (%s, model %s) " 1479 "was not created (not supported by this machine?)", 1480 nd->name ? nd->name : "anonymous", 1481 nd->model ? nd->model : "unspecified"); 1482 } 1483 } 1484 } 1485 1486 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1487 { 1488 return net_client_init(opts, false, errp); 1489 } 1490 1491 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1492 { 1493 return net_client_init(opts, true, errp); 1494 } 1495 1496 /* For the convenience "--nic" parameter */ 1497 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1498 { 1499 char *mac, *nd_id; 1500 int idx, ret; 1501 NICInfo *ni; 1502 const char *type; 1503 1504 type = qemu_opt_get(opts, "type"); 1505 if (type && g_str_equal(type, "none")) { 1506 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1507 } 1508 1509 idx = nic_get_free_idx(); 1510 if (idx == -1 || nb_nics >= MAX_NICS) { 1511 error_setg(errp, "no more on-board/default NIC slots available"); 1512 return -1; 1513 } 1514 1515 if (!type) { 1516 qemu_opt_set(opts, "type", "user", &error_abort); 1517 } 1518 1519 ni = &nd_table[idx]; 1520 memset(ni, 0, sizeof(*ni)); 1521 ni->model = qemu_opt_get_del(opts, "model"); 1522 1523 /* Create an ID if the user did not specify one */ 1524 nd_id = g_strdup(qemu_opts_id(opts)); 1525 if (!nd_id) { 1526 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx); 1527 qemu_opts_set_id(opts, nd_id); 1528 } 1529 1530 /* Handle MAC address */ 1531 mac = qemu_opt_get_del(opts, "mac"); 1532 if (mac) { 1533 ret = net_parse_macaddr(ni->macaddr.a, mac); 1534 g_free(mac); 1535 if (ret) { 1536 error_setg(errp, "invalid syntax for ethernet address"); 1537 goto out; 1538 } 1539 if (is_multicast_ether_addr(ni->macaddr.a)) { 1540 error_setg(errp, "NIC cannot have multicast MAC address"); 1541 ret = -1; 1542 goto out; 1543 } 1544 } 1545 qemu_macaddr_default_if_unset(&ni->macaddr); 1546 1547 ret = net_client_init(opts, true, errp); 1548 if (ret == 0) { 1549 ni->netdev = qemu_find_netdev(nd_id); 1550 ni->used = true; 1551 nb_nics++; 1552 } 1553 1554 out: 1555 g_free(nd_id); 1556 return ret; 1557 } 1558 1559 int net_init_clients(Error **errp) 1560 { 1561 net_change_state_entry = 1562 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1563 1564 QTAILQ_INIT(&net_clients); 1565 1566 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1567 net_init_netdev, NULL, errp)) { 1568 return -1; 1569 } 1570 1571 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1572 return -1; 1573 } 1574 1575 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1576 return -1; 1577 } 1578 1579 return 0; 1580 } 1581 1582 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1583 { 1584 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1585 return -1; 1586 } 1587 1588 return 0; 1589 } 1590 1591 /* From FreeBSD */ 1592 /* XXX: optimize */ 1593 uint32_t net_crc32(const uint8_t *p, int len) 1594 { 1595 uint32_t crc; 1596 int carry, i, j; 1597 uint8_t b; 1598 1599 crc = 0xffffffff; 1600 for (i = 0; i < len; i++) { 1601 b = *p++; 1602 for (j = 0; j < 8; j++) { 1603 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1604 crc <<= 1; 1605 b >>= 1; 1606 if (carry) { 1607 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1608 } 1609 } 1610 } 1611 1612 return crc; 1613 } 1614 1615 uint32_t net_crc32_le(const uint8_t *p, int len) 1616 { 1617 uint32_t crc; 1618 int carry, i, j; 1619 uint8_t b; 1620 1621 crc = 0xffffffff; 1622 for (i = 0; i < len; i++) { 1623 b = *p++; 1624 for (j = 0; j < 8; j++) { 1625 carry = (crc & 0x1) ^ (b & 0x01); 1626 crc >>= 1; 1627 b >>= 1; 1628 if (carry) { 1629 crc ^= POLYNOMIAL_LE; 1630 } 1631 } 1632 } 1633 1634 return crc; 1635 } 1636 1637 QemuOptsList qemu_netdev_opts = { 1638 .name = "netdev", 1639 .implied_opt_name = "type", 1640 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1641 .desc = { 1642 /* 1643 * no elements => accept any params 1644 * validation will happen later 1645 */ 1646 { /* end of list */ } 1647 }, 1648 }; 1649 1650 QemuOptsList qemu_nic_opts = { 1651 .name = "nic", 1652 .implied_opt_name = "type", 1653 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1654 .desc = { 1655 /* 1656 * no elements => accept any params 1657 * validation will happen later 1658 */ 1659 { /* end of list */ } 1660 }, 1661 }; 1662 1663 QemuOptsList qemu_net_opts = { 1664 .name = "net", 1665 .implied_opt_name = "type", 1666 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1667 .desc = { 1668 /* 1669 * no elements => accept any params 1670 * validation will happen later 1671 */ 1672 { /* end of list */ } 1673 }, 1674 }; 1675 1676 void net_socket_rs_init(SocketReadState *rs, 1677 SocketReadStateFinalize *finalize, 1678 bool vnet_hdr) 1679 { 1680 rs->state = 0; 1681 rs->vnet_hdr = vnet_hdr; 1682 rs->index = 0; 1683 rs->packet_len = 0; 1684 rs->vnet_hdr_len = 0; 1685 memset(rs->buf, 0, sizeof(rs->buf)); 1686 rs->finalize = finalize; 1687 } 1688 1689 /* 1690 * Returns 1691 * 0: success 1692 * -1: error occurs 1693 */ 1694 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1695 { 1696 unsigned int l; 1697 1698 while (size > 0) { 1699 /* Reassemble a packet from the network. 1700 * 0 = getting length. 1701 * 1 = getting vnet header length. 1702 * 2 = getting data. 1703 */ 1704 switch (rs->state) { 1705 case 0: 1706 l = 4 - rs->index; 1707 if (l > size) { 1708 l = size; 1709 } 1710 memcpy(rs->buf + rs->index, buf, l); 1711 buf += l; 1712 size -= l; 1713 rs->index += l; 1714 if (rs->index == 4) { 1715 /* got length */ 1716 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1717 rs->index = 0; 1718 if (rs->vnet_hdr) { 1719 rs->state = 1; 1720 } else { 1721 rs->state = 2; 1722 rs->vnet_hdr_len = 0; 1723 } 1724 } 1725 break; 1726 case 1: 1727 l = 4 - rs->index; 1728 if (l > size) { 1729 l = size; 1730 } 1731 memcpy(rs->buf + rs->index, buf, l); 1732 buf += l; 1733 size -= l; 1734 rs->index += l; 1735 if (rs->index == 4) { 1736 /* got vnet header length */ 1737 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1738 rs->index = 0; 1739 rs->state = 2; 1740 } 1741 break; 1742 case 2: 1743 l = rs->packet_len - rs->index; 1744 if (l > size) { 1745 l = size; 1746 } 1747 if (rs->index + l <= sizeof(rs->buf)) { 1748 memcpy(rs->buf + rs->index, buf, l); 1749 } else { 1750 fprintf(stderr, "serious error: oversized packet received," 1751 "connection terminated.\n"); 1752 rs->index = rs->state = 0; 1753 return -1; 1754 } 1755 1756 rs->index += l; 1757 buf += l; 1758 size -= l; 1759 if (rs->index >= rs->packet_len) { 1760 rs->index = 0; 1761 rs->state = 0; 1762 assert(rs->finalize); 1763 rs->finalize(rs); 1764 } 1765 break; 1766 } 1767 } 1768 1769 assert(size == 0); 1770 return 0; 1771 } 1772