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