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