1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 27 #include "net/net.h" 28 #include "clients.h" 29 #include "hub.h" 30 #include "hw/qdev-properties.h" 31 #include "net/slirp.h" 32 #include "net/eth.h" 33 #include "util.h" 34 35 #include "monitor/monitor.h" 36 #include "qemu/help_option.h" 37 #include "qapi/qapi-commands-net.h" 38 #include "qapi/qapi-visit-net.h" 39 #include "qapi/qmp/qdict.h" 40 #include "qapi/qmp/qerror.h" 41 #include "qemu/error-report.h" 42 #include "qemu/sockets.h" 43 #include "qemu/cutils.h" 44 #include "qemu/config-file.h" 45 #include "qemu/ctype.h" 46 #include "qemu/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 "sysemu/runstate.h" 54 #include "sysemu/sysemu.h" 55 #include "net/filter.h" 56 #include "qapi/string-output-visitor.h" 57 58 /* Net bridge is currently not supported for W32. */ 59 #if !defined(_WIN32) 60 # define CONFIG_NET_BRIDGE 61 #endif 62 63 static VMChangeStateEntry *net_change_state_entry; 64 static QTAILQ_HEAD(, NetClientState) net_clients; 65 66 /***********************************************************/ 67 /* network device redirectors */ 68 69 int parse_host_port(struct sockaddr_in *saddr, const char *str, 70 Error **errp) 71 { 72 gchar **substrings; 73 struct hostent *he; 74 const char *addr, *p, *r; 75 int port, ret = 0; 76 77 substrings = g_strsplit(str, ":", 2); 78 if (!substrings || !substrings[0] || !substrings[1]) { 79 error_setg(errp, "host address '%s' doesn't contain ':' " 80 "separating host from port", str); 81 ret = -1; 82 goto out; 83 } 84 85 addr = substrings[0]; 86 p = substrings[1]; 87 88 saddr->sin_family = AF_INET; 89 if (addr[0] == '\0') { 90 saddr->sin_addr.s_addr = 0; 91 } else { 92 if (qemu_isdigit(addr[0])) { 93 if (!inet_aton(addr, &saddr->sin_addr)) { 94 error_setg(errp, "host address '%s' is not a valid " 95 "IPv4 address", addr); 96 ret = -1; 97 goto out; 98 } 99 } else { 100 he = gethostbyname(addr); 101 if (he == NULL) { 102 error_setg(errp, "can't resolve host address '%s'", addr); 103 ret = -1; 104 goto out; 105 } 106 saddr->sin_addr = *(struct in_addr *)he->h_addr; 107 } 108 } 109 port = strtol(p, (char **)&r, 0); 110 if (r == p) { 111 error_setg(errp, "port number '%s' is invalid", p); 112 ret = -1; 113 goto out; 114 } 115 saddr->sin_port = htons(port); 116 117 out: 118 g_strfreev(substrings); 119 return ret; 120 } 121 122 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 123 { 124 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 125 macaddr[0], macaddr[1], macaddr[2], 126 macaddr[3], macaddr[4], macaddr[5]); 127 } 128 129 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 130 { 131 snprintf(nc->info_str, sizeof(nc->info_str), 132 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 133 nc->model, 134 macaddr[0], macaddr[1], macaddr[2], 135 macaddr[3], macaddr[4], macaddr[5]); 136 } 137 138 static int mac_table[256] = {0}; 139 140 static void qemu_macaddr_set_used(MACAddr *macaddr) 141 { 142 int index; 143 144 for (index = 0x56; index < 0xFF; index++) { 145 if (macaddr->a[5] == index) { 146 mac_table[index]++; 147 } 148 } 149 } 150 151 static void qemu_macaddr_set_free(MACAddr *macaddr) 152 { 153 int index; 154 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 155 156 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 157 return; 158 } 159 for (index = 0x56; index < 0xFF; index++) { 160 if (macaddr->a[5] == index) { 161 mac_table[index]--; 162 } 163 } 164 } 165 166 static int qemu_macaddr_get_free(void) 167 { 168 int index; 169 170 for (index = 0x56; index < 0xFF; index++) { 171 if (mac_table[index] == 0) { 172 return index; 173 } 174 } 175 176 return -1; 177 } 178 179 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 180 { 181 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 182 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 183 184 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 185 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 186 return; 187 } else { 188 qemu_macaddr_set_used(macaddr); 189 return; 190 } 191 } 192 193 macaddr->a[0] = 0x52; 194 macaddr->a[1] = 0x54; 195 macaddr->a[2] = 0x00; 196 macaddr->a[3] = 0x12; 197 macaddr->a[4] = 0x34; 198 macaddr->a[5] = qemu_macaddr_get_free(); 199 qemu_macaddr_set_used(macaddr); 200 } 201 202 /** 203 * Generate a name for net client 204 * 205 * Only net clients created with the legacy -net option and NICs need this. 206 */ 207 static char *assign_name(NetClientState *nc1, const char *model) 208 { 209 NetClientState *nc; 210 int id = 0; 211 212 QTAILQ_FOREACH(nc, &net_clients, next) { 213 if (nc == nc1) { 214 continue; 215 } 216 if (strcmp(nc->model, model) == 0) { 217 id++; 218 } 219 } 220 221 return g_strdup_printf("%s.%d", model, id); 222 } 223 224 static void qemu_net_client_destructor(NetClientState *nc) 225 { 226 g_free(nc); 227 } 228 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 229 unsigned flags, 230 const struct iovec *iov, 231 int iovcnt, 232 void *opaque); 233 234 static void qemu_net_client_setup(NetClientState *nc, 235 NetClientInfo *info, 236 NetClientState *peer, 237 const char *model, 238 const char *name, 239 NetClientDestructor *destructor) 240 { 241 nc->info = info; 242 nc->model = g_strdup(model); 243 if (name) { 244 nc->name = g_strdup(name); 245 } else { 246 nc->name = assign_name(nc, model); 247 } 248 249 if (peer) { 250 assert(!peer->peer); 251 nc->peer = peer; 252 peer->peer = nc; 253 } 254 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 255 256 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 257 nc->destructor = destructor; 258 QTAILQ_INIT(&nc->filters); 259 } 260 261 NetClientState *qemu_new_net_client(NetClientInfo *info, 262 NetClientState *peer, 263 const char *model, 264 const char *name) 265 { 266 NetClientState *nc; 267 268 assert(info->size >= sizeof(NetClientState)); 269 270 nc = g_malloc0(info->size); 271 qemu_net_client_setup(nc, info, peer, model, name, 272 qemu_net_client_destructor); 273 274 return nc; 275 } 276 277 NICState *qemu_new_nic(NetClientInfo *info, 278 NICConf *conf, 279 const char *model, 280 const char *name, 281 void *opaque) 282 { 283 NetClientState **peers = conf->peers.ncs; 284 NICState *nic; 285 int i, queues = MAX(1, conf->peers.queues); 286 287 assert(info->type == NET_CLIENT_DRIVER_NIC); 288 assert(info->size >= sizeof(NICState)); 289 290 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 291 nic->ncs = (void *)nic + info->size; 292 nic->conf = conf; 293 nic->opaque = opaque; 294 295 for (i = 0; i < queues; i++) { 296 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 297 NULL); 298 nic->ncs[i].queue_index = i; 299 } 300 301 return nic; 302 } 303 304 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 305 { 306 return nic->ncs + queue_index; 307 } 308 309 NetClientState *qemu_get_queue(NICState *nic) 310 { 311 return qemu_get_subqueue(nic, 0); 312 } 313 314 NICState *qemu_get_nic(NetClientState *nc) 315 { 316 NetClientState *nc0 = nc - nc->queue_index; 317 318 return (NICState *)((void *)nc0 - nc->info->size); 319 } 320 321 void *qemu_get_nic_opaque(NetClientState *nc) 322 { 323 NICState *nic = qemu_get_nic(nc); 324 325 return nic->opaque; 326 } 327 328 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 329 { 330 assert(nc != NULL); 331 NetClientState *ncs = nc + queue_index; 332 return ncs->peer; 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->peer); 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_VHOST_NET_VDPA 970 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 971 #endif 972 #ifdef CONFIG_L2TPV3 973 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 974 #endif 975 }; 976 977 978 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 979 { 980 NetClientState *peer = NULL; 981 982 if (is_netdev) { 983 if (netdev->type == NET_CLIENT_DRIVER_NIC || 984 !net_client_init_fun[netdev->type]) { 985 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 986 "a netdev backend type"); 987 return -1; 988 } 989 } else { 990 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 991 return 0; /* nothing to do */ 992 } 993 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 994 !net_client_init_fun[netdev->type]) { 995 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 996 "a net backend type (maybe it is not compiled " 997 "into this binary)"); 998 return -1; 999 } 1000 1001 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1002 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1003 !netdev->u.nic.has_netdev) { 1004 peer = net_hub_add_port(0, NULL, NULL); 1005 } 1006 } 1007 1008 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1009 /* FIXME drop when all init functions store an Error */ 1010 if (errp && !*errp) { 1011 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1012 NetClientDriver_str(netdev->type)); 1013 } 1014 return -1; 1015 } 1016 1017 if (is_netdev) { 1018 NetClientState *nc; 1019 1020 nc = qemu_find_netdev(netdev->id); 1021 assert(nc); 1022 nc->is_netdev = true; 1023 } 1024 1025 return 0; 1026 } 1027 1028 static void show_netdevs(void) 1029 { 1030 int idx; 1031 const char *available_netdevs[] = { 1032 "socket", 1033 "hubport", 1034 "tap", 1035 #ifdef CONFIG_SLIRP 1036 "user", 1037 #endif 1038 #ifdef CONFIG_L2TPV3 1039 "l2tpv3", 1040 #endif 1041 #ifdef CONFIG_VDE 1042 "vde", 1043 #endif 1044 #ifdef CONFIG_NET_BRIDGE 1045 "bridge", 1046 #endif 1047 #ifdef CONFIG_NETMAP 1048 "netmap", 1049 #endif 1050 #ifdef CONFIG_POSIX 1051 "vhost-user", 1052 #endif 1053 }; 1054 1055 printf("Available netdev backend types:\n"); 1056 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1057 puts(available_netdevs[idx]); 1058 } 1059 } 1060 1061 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1062 { 1063 gchar **substrings = NULL; 1064 Netdev *object = NULL; 1065 int ret = -1; 1066 Visitor *v = opts_visitor_new(opts); 1067 1068 const char *type = qemu_opt_get(opts, "type"); 1069 1070 if (is_netdev && type && is_help_option(type)) { 1071 show_netdevs(); 1072 exit(0); 1073 } else { 1074 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1075 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1076 1077 if (ip6_net) { 1078 char *prefix_addr; 1079 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1080 1081 substrings = g_strsplit(ip6_net, "/", 2); 1082 if (!substrings || !substrings[0]) { 1083 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1084 "a valid IPv6 prefix"); 1085 goto out; 1086 } 1087 1088 prefix_addr = substrings[0]; 1089 1090 /* Handle user-specified prefix length. */ 1091 if (substrings[1] && 1092 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1093 { 1094 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1095 "ipv6-prefixlen", "a number"); 1096 goto out; 1097 } 1098 1099 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1100 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1101 &error_abort); 1102 qemu_opt_unset(opts, "ipv6-net"); 1103 } 1104 } 1105 1106 /* Create an ID for -net if the user did not specify one */ 1107 if (!is_netdev && !qemu_opts_id(opts)) { 1108 static int idx; 1109 qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++)); 1110 } 1111 1112 if (visit_type_Netdev(v, NULL, &object, errp)) { 1113 ret = net_client_init1(object, is_netdev, errp); 1114 } 1115 1116 qapi_free_Netdev(object); 1117 1118 out: 1119 g_strfreev(substrings); 1120 visit_free(v); 1121 return ret; 1122 } 1123 1124 void netdev_add(QemuOpts *opts, Error **errp) 1125 { 1126 net_client_init(opts, true, errp); 1127 } 1128 1129 void qmp_netdev_add(Netdev *netdev, Error **errp) 1130 { 1131 net_client_init1(netdev, true, errp); 1132 } 1133 1134 void qmp_netdev_del(const char *id, Error **errp) 1135 { 1136 NetClientState *nc; 1137 1138 nc = qemu_find_netdev(id); 1139 if (!nc) { 1140 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1141 "Device '%s' not found", id); 1142 return; 1143 } 1144 1145 if (!nc->is_netdev) { 1146 error_setg(errp, "Device '%s' is not a netdev", id); 1147 return; 1148 } 1149 1150 qemu_del_net_client(nc); 1151 } 1152 1153 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1154 { 1155 char *str; 1156 ObjectProperty *prop; 1157 ObjectPropertyIterator iter; 1158 Visitor *v; 1159 1160 /* generate info str */ 1161 object_property_iter_init(&iter, OBJECT(nf)); 1162 while ((prop = object_property_iter_next(&iter))) { 1163 if (!strcmp(prop->name, "type")) { 1164 continue; 1165 } 1166 v = string_output_visitor_new(false, &str); 1167 object_property_get(OBJECT(nf), prop->name, v, NULL); 1168 visit_complete(v, &str); 1169 visit_free(v); 1170 monitor_printf(mon, ",%s=%s", prop->name, str); 1171 g_free(str); 1172 } 1173 monitor_printf(mon, "\n"); 1174 } 1175 1176 void print_net_client(Monitor *mon, NetClientState *nc) 1177 { 1178 NetFilterState *nf; 1179 1180 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1181 nc->queue_index, 1182 NetClientDriver_str(nc->info->type), 1183 nc->info_str); 1184 if (!QTAILQ_EMPTY(&nc->filters)) { 1185 monitor_printf(mon, "filters:\n"); 1186 } 1187 QTAILQ_FOREACH(nf, &nc->filters, next) { 1188 monitor_printf(mon, " - %s: type=%s", 1189 object_get_canonical_path_component(OBJECT(nf)), 1190 object_get_typename(OBJECT(nf))); 1191 netfilter_print_info(mon, nf); 1192 } 1193 } 1194 1195 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1196 Error **errp) 1197 { 1198 NetClientState *nc; 1199 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1200 1201 QTAILQ_FOREACH(nc, &net_clients, next) { 1202 RxFilterInfoList *entry; 1203 RxFilterInfo *info; 1204 1205 if (has_name && strcmp(nc->name, name) != 0) { 1206 continue; 1207 } 1208 1209 /* only query rx-filter information of NIC */ 1210 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1211 if (has_name) { 1212 error_setg(errp, "net client(%s) isn't a NIC", name); 1213 return NULL; 1214 } 1215 continue; 1216 } 1217 1218 /* only query information on queue 0 since the info is per nic, 1219 * not per queue 1220 */ 1221 if (nc->queue_index != 0) 1222 continue; 1223 1224 if (nc->info->query_rx_filter) { 1225 info = nc->info->query_rx_filter(nc); 1226 entry = g_malloc0(sizeof(*entry)); 1227 entry->value = info; 1228 1229 if (!filter_list) { 1230 filter_list = entry; 1231 } else { 1232 last_entry->next = entry; 1233 } 1234 last_entry = entry; 1235 } else if (has_name) { 1236 error_setg(errp, "net client(%s) doesn't support" 1237 " rx-filter querying", name); 1238 return NULL; 1239 } 1240 1241 if (has_name) { 1242 break; 1243 } 1244 } 1245 1246 if (filter_list == NULL && has_name) { 1247 error_setg(errp, "invalid net client name: %s", name); 1248 } 1249 1250 return filter_list; 1251 } 1252 1253 void hmp_info_network(Monitor *mon, const QDict *qdict) 1254 { 1255 NetClientState *nc, *peer; 1256 NetClientDriver type; 1257 1258 net_hub_info(mon); 1259 1260 QTAILQ_FOREACH(nc, &net_clients, next) { 1261 peer = nc->peer; 1262 type = nc->info->type; 1263 1264 /* Skip if already printed in hub info */ 1265 if (net_hub_id_for_client(nc, NULL) == 0) { 1266 continue; 1267 } 1268 1269 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1270 print_net_client(mon, nc); 1271 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1272 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1273 monitor_printf(mon, " \\ "); 1274 print_net_client(mon, peer); 1275 } 1276 } 1277 } 1278 1279 void colo_notify_filters_event(int event, Error **errp) 1280 { 1281 NetClientState *nc; 1282 NetFilterState *nf; 1283 NetFilterClass *nfc = NULL; 1284 Error *local_err = NULL; 1285 1286 QTAILQ_FOREACH(nc, &net_clients, next) { 1287 QTAILQ_FOREACH(nf, &nc->filters, next) { 1288 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1289 nfc->handle_event(nf, event, &local_err); 1290 if (local_err) { 1291 error_propagate(errp, local_err); 1292 return; 1293 } 1294 } 1295 } 1296 } 1297 1298 void qmp_set_link(const char *name, bool up, Error **errp) 1299 { 1300 NetClientState *ncs[MAX_QUEUE_NUM]; 1301 NetClientState *nc; 1302 int queues, i; 1303 1304 queues = qemu_find_net_clients_except(name, ncs, 1305 NET_CLIENT_DRIVER__MAX, 1306 MAX_QUEUE_NUM); 1307 1308 if (queues == 0) { 1309 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1310 "Device '%s' not found", name); 1311 return; 1312 } 1313 nc = ncs[0]; 1314 1315 for (i = 0; i < queues; i++) { 1316 ncs[i]->link_down = !up; 1317 } 1318 1319 if (nc->info->link_status_changed) { 1320 nc->info->link_status_changed(nc); 1321 } 1322 1323 if (nc->peer) { 1324 /* Change peer link only if the peer is NIC and then notify peer. 1325 * If the peer is a HUBPORT or a backend, we do not change the 1326 * link status. 1327 * 1328 * This behavior is compatible with qemu hubs where there could be 1329 * multiple clients that can still communicate with each other in 1330 * disconnected mode. For now maintain this compatibility. 1331 */ 1332 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1333 for (i = 0; i < queues; i++) { 1334 ncs[i]->peer->link_down = !up; 1335 } 1336 } 1337 if (nc->peer->info->link_status_changed) { 1338 nc->peer->info->link_status_changed(nc->peer); 1339 } 1340 } 1341 } 1342 1343 static void net_vm_change_state_handler(void *opaque, int running, 1344 RunState state) 1345 { 1346 NetClientState *nc; 1347 NetClientState *tmp; 1348 1349 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1350 if (running) { 1351 /* Flush queued packets and wake up backends. */ 1352 if (nc->peer && qemu_can_send_packet(nc)) { 1353 qemu_flush_queued_packets(nc->peer); 1354 } 1355 } else { 1356 /* Complete all queued packets, to guarantee we don't modify 1357 * state later when VM is not running. 1358 */ 1359 qemu_flush_or_purge_queued_packets(nc, true); 1360 } 1361 } 1362 } 1363 1364 void net_cleanup(void) 1365 { 1366 NetClientState *nc; 1367 1368 /* We may del multiple entries during qemu_del_net_client(), 1369 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1370 */ 1371 while (!QTAILQ_EMPTY(&net_clients)) { 1372 nc = QTAILQ_FIRST(&net_clients); 1373 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1374 qemu_del_nic(qemu_get_nic(nc)); 1375 } else { 1376 qemu_del_net_client(nc); 1377 } 1378 } 1379 1380 qemu_del_vm_change_state_handler(net_change_state_entry); 1381 } 1382 1383 void net_check_clients(void) 1384 { 1385 NetClientState *nc; 1386 int i; 1387 1388 net_hub_check_clients(); 1389 1390 QTAILQ_FOREACH(nc, &net_clients, next) { 1391 if (!nc->peer) { 1392 warn_report("%s %s has no peer", 1393 nc->info->type == NET_CLIENT_DRIVER_NIC 1394 ? "nic" : "netdev", 1395 nc->name); 1396 } 1397 } 1398 1399 /* Check that all NICs requested via -net nic actually got created. 1400 * NICs created via -device don't need to be checked here because 1401 * they are always instantiated. 1402 */ 1403 for (i = 0; i < MAX_NICS; i++) { 1404 NICInfo *nd = &nd_table[i]; 1405 if (nd->used && !nd->instantiated) { 1406 warn_report("requested NIC (%s, model %s) " 1407 "was not created (not supported by this machine?)", 1408 nd->name ? nd->name : "anonymous", 1409 nd->model ? nd->model : "unspecified"); 1410 } 1411 } 1412 } 1413 1414 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1415 { 1416 return net_client_init(opts, false, errp); 1417 } 1418 1419 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1420 { 1421 return net_client_init(opts, true, errp); 1422 } 1423 1424 /* For the convenience "--nic" parameter */ 1425 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1426 { 1427 char *mac, *nd_id; 1428 int idx, ret; 1429 NICInfo *ni; 1430 const char *type; 1431 1432 type = qemu_opt_get(opts, "type"); 1433 if (type && g_str_equal(type, "none")) { 1434 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1435 } 1436 1437 idx = nic_get_free_idx(); 1438 if (idx == -1 || nb_nics >= MAX_NICS) { 1439 error_setg(errp, "no more on-board/default NIC slots available"); 1440 return -1; 1441 } 1442 1443 if (!type) { 1444 qemu_opt_set(opts, "type", "user", &error_abort); 1445 } 1446 1447 ni = &nd_table[idx]; 1448 memset(ni, 0, sizeof(*ni)); 1449 ni->model = qemu_opt_get_del(opts, "model"); 1450 1451 /* Create an ID if the user did not specify one */ 1452 nd_id = g_strdup(qemu_opts_id(opts)); 1453 if (!nd_id) { 1454 nd_id = g_strdup_printf("__org.qemu.nic%i", idx); 1455 qemu_opts_set_id(opts, nd_id); 1456 } 1457 1458 /* Handle MAC address */ 1459 mac = qemu_opt_get_del(opts, "mac"); 1460 if (mac) { 1461 ret = net_parse_macaddr(ni->macaddr.a, mac); 1462 g_free(mac); 1463 if (ret) { 1464 error_setg(errp, "invalid syntax for ethernet address"); 1465 goto out; 1466 } 1467 if (is_multicast_ether_addr(ni->macaddr.a)) { 1468 error_setg(errp, "NIC cannot have multicast MAC address"); 1469 ret = -1; 1470 goto out; 1471 } 1472 } 1473 qemu_macaddr_default_if_unset(&ni->macaddr); 1474 1475 ret = net_client_init(opts, true, errp); 1476 if (ret == 0) { 1477 ni->netdev = qemu_find_netdev(nd_id); 1478 ni->used = true; 1479 nb_nics++; 1480 } 1481 1482 out: 1483 g_free(nd_id); 1484 return ret; 1485 } 1486 1487 int net_init_clients(Error **errp) 1488 { 1489 net_change_state_entry = 1490 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1491 1492 QTAILQ_INIT(&net_clients); 1493 1494 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1495 net_init_netdev, NULL, errp)) { 1496 return -1; 1497 } 1498 1499 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1500 return -1; 1501 } 1502 1503 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1504 return -1; 1505 } 1506 1507 return 0; 1508 } 1509 1510 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1511 { 1512 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1513 return -1; 1514 } 1515 1516 return 0; 1517 } 1518 1519 /* From FreeBSD */ 1520 /* XXX: optimize */ 1521 uint32_t net_crc32(const uint8_t *p, int len) 1522 { 1523 uint32_t crc; 1524 int carry, i, j; 1525 uint8_t b; 1526 1527 crc = 0xffffffff; 1528 for (i = 0; i < len; i++) { 1529 b = *p++; 1530 for (j = 0; j < 8; j++) { 1531 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1532 crc <<= 1; 1533 b >>= 1; 1534 if (carry) { 1535 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1536 } 1537 } 1538 } 1539 1540 return crc; 1541 } 1542 1543 uint32_t net_crc32_le(const uint8_t *p, int len) 1544 { 1545 uint32_t crc; 1546 int carry, i, j; 1547 uint8_t b; 1548 1549 crc = 0xffffffff; 1550 for (i = 0; i < len; i++) { 1551 b = *p++; 1552 for (j = 0; j < 8; j++) { 1553 carry = (crc & 0x1) ^ (b & 0x01); 1554 crc >>= 1; 1555 b >>= 1; 1556 if (carry) { 1557 crc ^= POLYNOMIAL_LE; 1558 } 1559 } 1560 } 1561 1562 return crc; 1563 } 1564 1565 QemuOptsList qemu_netdev_opts = { 1566 .name = "netdev", 1567 .implied_opt_name = "type", 1568 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1569 .desc = { 1570 /* 1571 * no elements => accept any params 1572 * validation will happen later 1573 */ 1574 { /* end of list */ } 1575 }, 1576 }; 1577 1578 QemuOptsList qemu_nic_opts = { 1579 .name = "nic", 1580 .implied_opt_name = "type", 1581 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1582 .desc = { 1583 /* 1584 * no elements => accept any params 1585 * validation will happen later 1586 */ 1587 { /* end of list */ } 1588 }, 1589 }; 1590 1591 QemuOptsList qemu_net_opts = { 1592 .name = "net", 1593 .implied_opt_name = "type", 1594 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1595 .desc = { 1596 /* 1597 * no elements => accept any params 1598 * validation will happen later 1599 */ 1600 { /* end of list */ } 1601 }, 1602 }; 1603 1604 void net_socket_rs_init(SocketReadState *rs, 1605 SocketReadStateFinalize *finalize, 1606 bool vnet_hdr) 1607 { 1608 rs->state = 0; 1609 rs->vnet_hdr = vnet_hdr; 1610 rs->index = 0; 1611 rs->packet_len = 0; 1612 rs->vnet_hdr_len = 0; 1613 memset(rs->buf, 0, sizeof(rs->buf)); 1614 rs->finalize = finalize; 1615 } 1616 1617 /* 1618 * Returns 1619 * 0: success 1620 * -1: error occurs 1621 */ 1622 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1623 { 1624 unsigned int l; 1625 1626 while (size > 0) { 1627 /* Reassemble a packet from the network. 1628 * 0 = getting length. 1629 * 1 = getting vnet header length. 1630 * 2 = getting data. 1631 */ 1632 switch (rs->state) { 1633 case 0: 1634 l = 4 - rs->index; 1635 if (l > size) { 1636 l = size; 1637 } 1638 memcpy(rs->buf + rs->index, buf, l); 1639 buf += l; 1640 size -= l; 1641 rs->index += l; 1642 if (rs->index == 4) { 1643 /* got length */ 1644 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1645 rs->index = 0; 1646 if (rs->vnet_hdr) { 1647 rs->state = 1; 1648 } else { 1649 rs->state = 2; 1650 rs->vnet_hdr_len = 0; 1651 } 1652 } 1653 break; 1654 case 1: 1655 l = 4 - rs->index; 1656 if (l > size) { 1657 l = size; 1658 } 1659 memcpy(rs->buf + rs->index, buf, l); 1660 buf += l; 1661 size -= l; 1662 rs->index += l; 1663 if (rs->index == 4) { 1664 /* got vnet header length */ 1665 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1666 rs->index = 0; 1667 rs->state = 2; 1668 } 1669 break; 1670 case 2: 1671 l = rs->packet_len - rs->index; 1672 if (l > size) { 1673 l = size; 1674 } 1675 if (rs->index + l <= sizeof(rs->buf)) { 1676 memcpy(rs->buf + rs->index, buf, l); 1677 } else { 1678 fprintf(stderr, "serious error: oversized packet received," 1679 "connection terminated.\n"); 1680 rs->index = rs->state = 0; 1681 return -1; 1682 } 1683 1684 rs->index += l; 1685 buf += l; 1686 size -= l; 1687 if (rs->index >= rs->packet_len) { 1688 rs->index = 0; 1689 rs->state = 0; 1690 assert(rs->finalize); 1691 rs->finalize(rs); 1692 } 1693 break; 1694 } 1695 } 1696 1697 assert(size == 0); 1698 return 0; 1699 } 1700