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 static void qemu_cleanup_net_client(NetClientState *nc) 329 { 330 QTAILQ_REMOVE(&net_clients, nc, next); 331 332 if (nc->info->cleanup) { 333 nc->info->cleanup(nc); 334 } 335 } 336 337 static void qemu_free_net_client(NetClientState *nc) 338 { 339 if (nc->incoming_queue) { 340 qemu_del_net_queue(nc->incoming_queue); 341 } 342 if (nc->peer) { 343 nc->peer->peer = NULL; 344 } 345 g_free(nc->name); 346 g_free(nc->model); 347 if (nc->destructor) { 348 nc->destructor(nc); 349 } 350 } 351 352 void qemu_del_net_client(NetClientState *nc) 353 { 354 NetClientState *ncs[MAX_QUEUE_NUM]; 355 int queues, i; 356 NetFilterState *nf, *next; 357 358 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 359 360 /* If the NetClientState belongs to a multiqueue backend, we will change all 361 * other NetClientStates also. 362 */ 363 queues = qemu_find_net_clients_except(nc->name, ncs, 364 NET_CLIENT_DRIVER_NIC, 365 MAX_QUEUE_NUM); 366 assert(queues != 0); 367 368 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 369 object_unparent(OBJECT(nf)); 370 } 371 372 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 373 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 374 NICState *nic = qemu_get_nic(nc->peer); 375 if (nic->peer_deleted) { 376 return; 377 } 378 nic->peer_deleted = true; 379 380 for (i = 0; i < queues; i++) { 381 ncs[i]->peer->link_down = true; 382 } 383 384 if (nc->peer->info->link_status_changed) { 385 nc->peer->info->link_status_changed(nc->peer); 386 } 387 388 for (i = 0; i < queues; i++) { 389 qemu_cleanup_net_client(ncs[i]); 390 } 391 392 return; 393 } 394 395 for (i = 0; i < queues; i++) { 396 qemu_cleanup_net_client(ncs[i]); 397 qemu_free_net_client(ncs[i]); 398 } 399 } 400 401 void qemu_del_nic(NICState *nic) 402 { 403 int i, queues = MAX(nic->conf->peers.queues, 1); 404 405 qemu_macaddr_set_free(&nic->conf->macaddr); 406 407 /* If this is a peer NIC and peer has already been deleted, free it now. */ 408 if (nic->peer_deleted) { 409 for (i = 0; i < queues; i++) { 410 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 411 } 412 } 413 414 for (i = queues - 1; i >= 0; i--) { 415 NetClientState *nc = qemu_get_subqueue(nic, i); 416 417 qemu_cleanup_net_client(nc); 418 qemu_free_net_client(nc); 419 } 420 421 g_free(nic); 422 } 423 424 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 425 { 426 NetClientState *nc; 427 428 QTAILQ_FOREACH(nc, &net_clients, next) { 429 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 430 if (nc->queue_index == 0) { 431 func(qemu_get_nic(nc), opaque); 432 } 433 } 434 } 435 } 436 437 bool qemu_has_ufo(NetClientState *nc) 438 { 439 if (!nc || !nc->info->has_ufo) { 440 return false; 441 } 442 443 return nc->info->has_ufo(nc); 444 } 445 446 bool qemu_has_vnet_hdr(NetClientState *nc) 447 { 448 if (!nc || !nc->info->has_vnet_hdr) { 449 return false; 450 } 451 452 return nc->info->has_vnet_hdr(nc); 453 } 454 455 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 456 { 457 if (!nc || !nc->info->has_vnet_hdr_len) { 458 return false; 459 } 460 461 return nc->info->has_vnet_hdr_len(nc, len); 462 } 463 464 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 465 { 466 if (!nc || !nc->info->using_vnet_hdr) { 467 return; 468 } 469 470 nc->info->using_vnet_hdr(nc, enable); 471 } 472 473 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 474 int ecn, int ufo) 475 { 476 if (!nc || !nc->info->set_offload) { 477 return; 478 } 479 480 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 481 } 482 483 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 484 { 485 if (!nc || !nc->info->set_vnet_hdr_len) { 486 return; 487 } 488 489 nc->vnet_hdr_len = len; 490 nc->info->set_vnet_hdr_len(nc, len); 491 } 492 493 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 494 { 495 #ifdef HOST_WORDS_BIGENDIAN 496 if (!nc || !nc->info->set_vnet_le) { 497 return -ENOSYS; 498 } 499 500 return nc->info->set_vnet_le(nc, is_le); 501 #else 502 return 0; 503 #endif 504 } 505 506 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 507 { 508 #ifdef HOST_WORDS_BIGENDIAN 509 return 0; 510 #else 511 if (!nc || !nc->info->set_vnet_be) { 512 return -ENOSYS; 513 } 514 515 return nc->info->set_vnet_be(nc, is_be); 516 #endif 517 } 518 519 int qemu_can_send_packet(NetClientState *sender) 520 { 521 int vm_running = runstate_is_running(); 522 523 if (!vm_running) { 524 return 0; 525 } 526 527 if (!sender->peer) { 528 return 1; 529 } 530 531 if (sender->peer->receive_disabled) { 532 return 0; 533 } else if (sender->peer->info->can_receive && 534 !sender->peer->info->can_receive(sender->peer)) { 535 return 0; 536 } 537 return 1; 538 } 539 540 static ssize_t filter_receive_iov(NetClientState *nc, 541 NetFilterDirection direction, 542 NetClientState *sender, 543 unsigned flags, 544 const struct iovec *iov, 545 int iovcnt, 546 NetPacketSent *sent_cb) 547 { 548 ssize_t ret = 0; 549 NetFilterState *nf = NULL; 550 551 if (direction == NET_FILTER_DIRECTION_TX) { 552 QTAILQ_FOREACH(nf, &nc->filters, next) { 553 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 554 iovcnt, sent_cb); 555 if (ret) { 556 return ret; 557 } 558 } 559 } else { 560 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 561 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 562 iovcnt, sent_cb); 563 if (ret) { 564 return ret; 565 } 566 } 567 } 568 569 return ret; 570 } 571 572 static ssize_t filter_receive(NetClientState *nc, 573 NetFilterDirection direction, 574 NetClientState *sender, 575 unsigned flags, 576 const uint8_t *data, 577 size_t size, 578 NetPacketSent *sent_cb) 579 { 580 struct iovec iov = { 581 .iov_base = (void *)data, 582 .iov_len = size 583 }; 584 585 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 586 } 587 588 void qemu_purge_queued_packets(NetClientState *nc) 589 { 590 if (!nc->peer) { 591 return; 592 } 593 594 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 595 } 596 597 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 598 { 599 nc->receive_disabled = 0; 600 601 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 602 if (net_hub_flush(nc->peer)) { 603 qemu_notify_event(); 604 } 605 } 606 if (qemu_net_queue_flush(nc->incoming_queue)) { 607 /* We emptied the queue successfully, signal to the IO thread to repoll 608 * the file descriptor (for tap, for example). 609 */ 610 qemu_notify_event(); 611 } else if (purge) { 612 /* Unable to empty the queue, purge remaining packets */ 613 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 614 } 615 } 616 617 void qemu_flush_queued_packets(NetClientState *nc) 618 { 619 qemu_flush_or_purge_queued_packets(nc, false); 620 } 621 622 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 623 unsigned flags, 624 const uint8_t *buf, int size, 625 NetPacketSent *sent_cb) 626 { 627 NetQueue *queue; 628 int ret; 629 630 #ifdef DEBUG_NET 631 printf("qemu_send_packet_async:\n"); 632 qemu_hexdump((const char *)buf, stdout, "net", size); 633 #endif 634 635 if (sender->link_down || !sender->peer) { 636 return size; 637 } 638 639 /* Let filters handle the packet first */ 640 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 641 sender, flags, buf, size, sent_cb); 642 if (ret) { 643 return ret; 644 } 645 646 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 647 sender, flags, buf, size, sent_cb); 648 if (ret) { 649 return ret; 650 } 651 652 queue = sender->peer->incoming_queue; 653 654 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 655 } 656 657 ssize_t qemu_send_packet_async(NetClientState *sender, 658 const uint8_t *buf, int size, 659 NetPacketSent *sent_cb) 660 { 661 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 662 buf, size, sent_cb); 663 } 664 665 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 666 { 667 return qemu_send_packet_async(nc, buf, size, NULL); 668 } 669 670 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 671 { 672 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 673 buf, size, NULL); 674 } 675 676 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 677 int iovcnt, unsigned flags) 678 { 679 uint8_t *buf = NULL; 680 uint8_t *buffer; 681 size_t offset; 682 ssize_t ret; 683 684 if (iovcnt == 1) { 685 buffer = iov[0].iov_base; 686 offset = iov[0].iov_len; 687 } else { 688 offset = iov_size(iov, iovcnt); 689 if (offset > NET_BUFSIZE) { 690 return -1; 691 } 692 buf = g_malloc(offset); 693 buffer = buf; 694 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 695 } 696 697 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 698 ret = nc->info->receive_raw(nc, buffer, offset); 699 } else { 700 ret = nc->info->receive(nc, buffer, offset); 701 } 702 703 g_free(buf); 704 return ret; 705 } 706 707 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 708 unsigned flags, 709 const struct iovec *iov, 710 int iovcnt, 711 void *opaque) 712 { 713 NetClientState *nc = opaque; 714 int ret; 715 716 717 if (nc->link_down) { 718 return iov_size(iov, iovcnt); 719 } 720 721 if (nc->receive_disabled) { 722 return 0; 723 } 724 725 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 726 ret = nc->info->receive_iov(nc, iov, iovcnt); 727 } else { 728 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 729 } 730 731 if (ret == 0) { 732 nc->receive_disabled = 1; 733 } 734 735 return ret; 736 } 737 738 ssize_t qemu_sendv_packet_async(NetClientState *sender, 739 const struct iovec *iov, int iovcnt, 740 NetPacketSent *sent_cb) 741 { 742 NetQueue *queue; 743 size_t size = iov_size(iov, iovcnt); 744 int ret; 745 746 if (size > NET_BUFSIZE) { 747 return size; 748 } 749 750 if (sender->link_down || !sender->peer) { 751 return size; 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 printf("Supported NIC models:\n"); 835 for (i = 0 ; models[i]; i++) { 836 printf("%s\n", models[i]); 837 } 838 return 1; 839 } 840 841 void qemu_check_nic_model(NICInfo *nd, const char *model) 842 { 843 const char *models[2]; 844 845 models[0] = model; 846 models[1] = NULL; 847 848 if (qemu_show_nic_models(nd->model, models)) 849 exit(0); 850 if (qemu_find_nic_model(nd, models, model) < 0) 851 exit(1); 852 } 853 854 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 855 const char *default_model) 856 { 857 int i; 858 859 if (!nd->model) 860 nd->model = g_strdup(default_model); 861 862 for (i = 0 ; models[i]; i++) { 863 if (strcmp(nd->model, models[i]) == 0) 864 return i; 865 } 866 867 error_report("Unsupported NIC model: %s", nd->model); 868 return -1; 869 } 870 871 static int net_init_nic(const Netdev *netdev, const char *name, 872 NetClientState *peer, Error **errp) 873 { 874 int idx; 875 NICInfo *nd; 876 const NetLegacyNicOptions *nic; 877 878 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 879 nic = &netdev->u.nic; 880 881 idx = nic_get_free_idx(); 882 if (idx == -1 || nb_nics >= MAX_NICS) { 883 error_setg(errp, "too many NICs"); 884 return -1; 885 } 886 887 nd = &nd_table[idx]; 888 889 memset(nd, 0, sizeof(*nd)); 890 891 if (nic->has_netdev) { 892 nd->netdev = qemu_find_netdev(nic->netdev); 893 if (!nd->netdev) { 894 error_setg(errp, "netdev '%s' not found", nic->netdev); 895 return -1; 896 } 897 } else { 898 assert(peer); 899 nd->netdev = peer; 900 } 901 nd->name = g_strdup(name); 902 if (nic->has_model) { 903 nd->model = g_strdup(nic->model); 904 } 905 if (nic->has_addr) { 906 nd->devaddr = g_strdup(nic->addr); 907 } 908 909 if (nic->has_macaddr && 910 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 911 error_setg(errp, "invalid syntax for ethernet address"); 912 return -1; 913 } 914 if (nic->has_macaddr && 915 is_multicast_ether_addr(nd->macaddr.a)) { 916 error_setg(errp, 917 "NIC cannot have multicast MAC address (odd 1st byte)"); 918 return -1; 919 } 920 qemu_macaddr_default_if_unset(&nd->macaddr); 921 922 if (nic->has_vectors) { 923 if (nic->vectors > 0x7ffffff) { 924 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 925 return -1; 926 } 927 nd->nvectors = nic->vectors; 928 } else { 929 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 930 } 931 932 nd->used = 1; 933 nb_nics++; 934 935 return idx; 936 } 937 938 939 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 940 const Netdev *netdev, 941 const char *name, 942 NetClientState *peer, Error **errp) = { 943 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 944 #ifdef CONFIG_SLIRP 945 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 946 #endif 947 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 948 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 949 #ifdef CONFIG_VDE 950 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 951 #endif 952 #ifdef CONFIG_NETMAP 953 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 954 #endif 955 #ifdef CONFIG_NET_BRIDGE 956 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 957 #endif 958 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 959 #ifdef CONFIG_VHOST_NET_USER 960 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 961 #endif 962 #ifdef CONFIG_L2TPV3 963 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 964 #endif 965 }; 966 967 968 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 969 { 970 NetClientState *peer = NULL; 971 972 if (is_netdev) { 973 if (netdev->type == NET_CLIENT_DRIVER_NIC || 974 !net_client_init_fun[netdev->type]) { 975 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 976 "a netdev backend type"); 977 return -1; 978 } 979 } else { 980 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 981 return 0; /* nothing to do */ 982 } 983 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 984 !net_client_init_fun[netdev->type]) { 985 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 986 "a net backend type (maybe it is not compiled " 987 "into this binary)"); 988 return -1; 989 } 990 991 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 992 if (netdev->type != NET_CLIENT_DRIVER_NIC || 993 !netdev->u.nic.has_netdev) { 994 peer = net_hub_add_port(0, NULL, NULL); 995 } 996 } 997 998 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 999 /* FIXME drop when all init functions store an Error */ 1000 if (errp && !*errp) { 1001 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1002 NetClientDriver_str(netdev->type)); 1003 } 1004 return -1; 1005 } 1006 1007 if (is_netdev) { 1008 NetClientState *nc; 1009 1010 nc = qemu_find_netdev(netdev->id); 1011 assert(nc); 1012 nc->is_netdev = true; 1013 } 1014 1015 return 0; 1016 } 1017 1018 static void show_netdevs(void) 1019 { 1020 int idx; 1021 const char *available_netdevs[] = { 1022 "socket", 1023 "hubport", 1024 "tap", 1025 #ifdef CONFIG_SLIRP 1026 "user", 1027 #endif 1028 #ifdef CONFIG_L2TPV3 1029 "l2tpv3", 1030 #endif 1031 #ifdef CONFIG_VDE 1032 "vde", 1033 #endif 1034 #ifdef CONFIG_NET_BRIDGE 1035 "bridge", 1036 #endif 1037 #ifdef CONFIG_NETMAP 1038 "netmap", 1039 #endif 1040 #ifdef CONFIG_POSIX 1041 "vhost-user", 1042 #endif 1043 }; 1044 1045 printf("Available netdev backend types:\n"); 1046 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1047 puts(available_netdevs[idx]); 1048 } 1049 } 1050 1051 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1052 { 1053 gchar **substrings = NULL; 1054 Netdev *object = NULL; 1055 Error *err = NULL; 1056 int ret = -1; 1057 Visitor *v = opts_visitor_new(opts); 1058 1059 const char *type = qemu_opt_get(opts, "type"); 1060 1061 if (is_netdev && type && is_help_option(type)) { 1062 show_netdevs(); 1063 exit(0); 1064 } else { 1065 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1066 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1067 1068 if (ip6_net) { 1069 char *prefix_addr; 1070 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1071 1072 substrings = g_strsplit(ip6_net, "/", 2); 1073 if (!substrings || !substrings[0]) { 1074 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1075 "a valid IPv6 prefix"); 1076 goto out; 1077 } 1078 1079 prefix_addr = substrings[0]; 1080 1081 /* Handle user-specified prefix length. */ 1082 if (substrings[1] && 1083 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1084 { 1085 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1086 "ipv6-prefixlen", "a number"); 1087 goto out; 1088 } 1089 1090 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1091 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1092 &error_abort); 1093 qemu_opt_unset(opts, "ipv6-net"); 1094 } 1095 } 1096 1097 /* Create an ID for -net if the user did not specify one */ 1098 if (!is_netdev && !qemu_opts_id(opts)) { 1099 static int idx; 1100 qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++)); 1101 } 1102 1103 visit_type_Netdev(v, NULL, &object, &err); 1104 1105 if (!err) { 1106 ret = net_client_init1(object, is_netdev, &err); 1107 } 1108 1109 qapi_free_Netdev(object); 1110 1111 out: 1112 error_propagate(errp, err); 1113 g_strfreev(substrings); 1114 visit_free(v); 1115 return ret; 1116 } 1117 1118 void netdev_add(QemuOpts *opts, Error **errp) 1119 { 1120 net_client_init(opts, true, errp); 1121 } 1122 1123 void qmp_netdev_add(Netdev *netdev, Error **errp) 1124 { 1125 net_client_init1(netdev, true, errp); 1126 } 1127 1128 void qmp_netdev_del(const char *id, Error **errp) 1129 { 1130 NetClientState *nc; 1131 1132 nc = qemu_find_netdev(id); 1133 if (!nc) { 1134 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1135 "Device '%s' not found", id); 1136 return; 1137 } 1138 1139 if (!nc->is_netdev) { 1140 error_setg(errp, "Device '%s' is not a netdev", id); 1141 return; 1142 } 1143 1144 qemu_del_net_client(nc); 1145 } 1146 1147 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1148 { 1149 char *str; 1150 ObjectProperty *prop; 1151 ObjectPropertyIterator iter; 1152 Visitor *v; 1153 1154 /* generate info str */ 1155 object_property_iter_init(&iter, OBJECT(nf)); 1156 while ((prop = object_property_iter_next(&iter))) { 1157 if (!strcmp(prop->name, "type")) { 1158 continue; 1159 } 1160 v = string_output_visitor_new(false, &str); 1161 object_property_get(OBJECT(nf), v, prop->name, NULL); 1162 visit_complete(v, &str); 1163 visit_free(v); 1164 monitor_printf(mon, ",%s=%s", prop->name, str); 1165 g_free(str); 1166 } 1167 monitor_printf(mon, "\n"); 1168 } 1169 1170 void print_net_client(Monitor *mon, NetClientState *nc) 1171 { 1172 NetFilterState *nf; 1173 1174 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1175 nc->queue_index, 1176 NetClientDriver_str(nc->info->type), 1177 nc->info_str); 1178 if (!QTAILQ_EMPTY(&nc->filters)) { 1179 monitor_printf(mon, "filters:\n"); 1180 } 1181 QTAILQ_FOREACH(nf, &nc->filters, next) { 1182 char *path = object_get_canonical_path_component(OBJECT(nf)); 1183 1184 monitor_printf(mon, " - %s: type=%s", path, 1185 object_get_typename(OBJECT(nf))); 1186 netfilter_print_info(mon, nf); 1187 g_free(path); 1188 } 1189 } 1190 1191 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1192 Error **errp) 1193 { 1194 NetClientState *nc; 1195 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1196 1197 QTAILQ_FOREACH(nc, &net_clients, next) { 1198 RxFilterInfoList *entry; 1199 RxFilterInfo *info; 1200 1201 if (has_name && strcmp(nc->name, name) != 0) { 1202 continue; 1203 } 1204 1205 /* only query rx-filter information of NIC */ 1206 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1207 if (has_name) { 1208 error_setg(errp, "net client(%s) isn't a NIC", name); 1209 return NULL; 1210 } 1211 continue; 1212 } 1213 1214 /* only query information on queue 0 since the info is per nic, 1215 * not per queue 1216 */ 1217 if (nc->queue_index != 0) 1218 continue; 1219 1220 if (nc->info->query_rx_filter) { 1221 info = nc->info->query_rx_filter(nc); 1222 entry = g_malloc0(sizeof(*entry)); 1223 entry->value = info; 1224 1225 if (!filter_list) { 1226 filter_list = entry; 1227 } else { 1228 last_entry->next = entry; 1229 } 1230 last_entry = entry; 1231 } else if (has_name) { 1232 error_setg(errp, "net client(%s) doesn't support" 1233 " rx-filter querying", name); 1234 return NULL; 1235 } 1236 1237 if (has_name) { 1238 break; 1239 } 1240 } 1241 1242 if (filter_list == NULL && has_name) { 1243 error_setg(errp, "invalid net client name: %s", name); 1244 } 1245 1246 return filter_list; 1247 } 1248 1249 void hmp_info_network(Monitor *mon, const QDict *qdict) 1250 { 1251 NetClientState *nc, *peer; 1252 NetClientDriver type; 1253 1254 net_hub_info(mon); 1255 1256 QTAILQ_FOREACH(nc, &net_clients, next) { 1257 peer = nc->peer; 1258 type = nc->info->type; 1259 1260 /* Skip if already printed in hub info */ 1261 if (net_hub_id_for_client(nc, NULL) == 0) { 1262 continue; 1263 } 1264 1265 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1266 print_net_client(mon, nc); 1267 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1268 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1269 monitor_printf(mon, " \\ "); 1270 print_net_client(mon, peer); 1271 } 1272 } 1273 } 1274 1275 void colo_notify_filters_event(int event, Error **errp) 1276 { 1277 NetClientState *nc; 1278 NetFilterState *nf; 1279 NetFilterClass *nfc = NULL; 1280 Error *local_err = NULL; 1281 1282 QTAILQ_FOREACH(nc, &net_clients, next) { 1283 QTAILQ_FOREACH(nf, &nc->filters, next) { 1284 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1285 nfc->handle_event(nf, event, &local_err); 1286 if (local_err) { 1287 error_propagate(errp, local_err); 1288 return; 1289 } 1290 } 1291 } 1292 } 1293 1294 void qmp_set_link(const char *name, bool up, Error **errp) 1295 { 1296 NetClientState *ncs[MAX_QUEUE_NUM]; 1297 NetClientState *nc; 1298 int queues, i; 1299 1300 queues = qemu_find_net_clients_except(name, ncs, 1301 NET_CLIENT_DRIVER__MAX, 1302 MAX_QUEUE_NUM); 1303 1304 if (queues == 0) { 1305 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1306 "Device '%s' not found", name); 1307 return; 1308 } 1309 nc = ncs[0]; 1310 1311 for (i = 0; i < queues; i++) { 1312 ncs[i]->link_down = !up; 1313 } 1314 1315 if (nc->info->link_status_changed) { 1316 nc->info->link_status_changed(nc); 1317 } 1318 1319 if (nc->peer) { 1320 /* Change peer link only if the peer is NIC and then notify peer. 1321 * If the peer is a HUBPORT or a backend, we do not change the 1322 * link status. 1323 * 1324 * This behavior is compatible with qemu hubs where there could be 1325 * multiple clients that can still communicate with each other in 1326 * disconnected mode. For now maintain this compatibility. 1327 */ 1328 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1329 for (i = 0; i < queues; i++) { 1330 ncs[i]->peer->link_down = !up; 1331 } 1332 } 1333 if (nc->peer->info->link_status_changed) { 1334 nc->peer->info->link_status_changed(nc->peer); 1335 } 1336 } 1337 } 1338 1339 static void net_vm_change_state_handler(void *opaque, int running, 1340 RunState state) 1341 { 1342 NetClientState *nc; 1343 NetClientState *tmp; 1344 1345 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1346 if (running) { 1347 /* Flush queued packets and wake up backends. */ 1348 if (nc->peer && qemu_can_send_packet(nc)) { 1349 qemu_flush_queued_packets(nc->peer); 1350 } 1351 } else { 1352 /* Complete all queued packets, to guarantee we don't modify 1353 * state later when VM is not running. 1354 */ 1355 qemu_flush_or_purge_queued_packets(nc, true); 1356 } 1357 } 1358 } 1359 1360 void net_cleanup(void) 1361 { 1362 NetClientState *nc; 1363 1364 /* We may del multiple entries during qemu_del_net_client(), 1365 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1366 */ 1367 while (!QTAILQ_EMPTY(&net_clients)) { 1368 nc = QTAILQ_FIRST(&net_clients); 1369 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1370 qemu_del_nic(qemu_get_nic(nc)); 1371 } else { 1372 qemu_del_net_client(nc); 1373 } 1374 } 1375 1376 qemu_del_vm_change_state_handler(net_change_state_entry); 1377 } 1378 1379 void net_check_clients(void) 1380 { 1381 NetClientState *nc; 1382 int i; 1383 1384 net_hub_check_clients(); 1385 1386 QTAILQ_FOREACH(nc, &net_clients, next) { 1387 if (!nc->peer) { 1388 warn_report("%s %s has no peer", 1389 nc->info->type == NET_CLIENT_DRIVER_NIC 1390 ? "nic" : "netdev", 1391 nc->name); 1392 } 1393 } 1394 1395 /* Check that all NICs requested via -net nic actually got created. 1396 * NICs created via -device don't need to be checked here because 1397 * they are always instantiated. 1398 */ 1399 for (i = 0; i < MAX_NICS; i++) { 1400 NICInfo *nd = &nd_table[i]; 1401 if (nd->used && !nd->instantiated) { 1402 warn_report("requested NIC (%s, model %s) " 1403 "was not created (not supported by this machine?)", 1404 nd->name ? nd->name : "anonymous", 1405 nd->model ? nd->model : "unspecified"); 1406 } 1407 } 1408 } 1409 1410 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1411 { 1412 return net_client_init(opts, false, errp); 1413 } 1414 1415 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1416 { 1417 return net_client_init(opts, true, errp); 1418 } 1419 1420 /* For the convenience "--nic" parameter */ 1421 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1422 { 1423 char *mac, *nd_id; 1424 int idx, ret; 1425 NICInfo *ni; 1426 const char *type; 1427 1428 type = qemu_opt_get(opts, "type"); 1429 if (type && g_str_equal(type, "none")) { 1430 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1431 } 1432 1433 idx = nic_get_free_idx(); 1434 if (idx == -1 || nb_nics >= MAX_NICS) { 1435 error_setg(errp, "no more on-board/default NIC slots available"); 1436 return -1; 1437 } 1438 1439 if (!type) { 1440 qemu_opt_set(opts, "type", "user", &error_abort); 1441 } 1442 1443 ni = &nd_table[idx]; 1444 memset(ni, 0, sizeof(*ni)); 1445 ni->model = qemu_opt_get_del(opts, "model"); 1446 1447 /* Create an ID if the user did not specify one */ 1448 nd_id = g_strdup(qemu_opts_id(opts)); 1449 if (!nd_id) { 1450 nd_id = g_strdup_printf("__org.qemu.nic%i", idx); 1451 qemu_opts_set_id(opts, nd_id); 1452 } 1453 1454 /* Handle MAC address */ 1455 mac = qemu_opt_get_del(opts, "mac"); 1456 if (mac) { 1457 ret = net_parse_macaddr(ni->macaddr.a, mac); 1458 g_free(mac); 1459 if (ret) { 1460 error_setg(errp, "invalid syntax for ethernet address"); 1461 goto out; 1462 } 1463 if (is_multicast_ether_addr(ni->macaddr.a)) { 1464 error_setg(errp, "NIC cannot have multicast MAC address"); 1465 ret = -1; 1466 goto out; 1467 } 1468 } 1469 qemu_macaddr_default_if_unset(&ni->macaddr); 1470 1471 ret = net_client_init(opts, true, errp); 1472 if (ret == 0) { 1473 ni->netdev = qemu_find_netdev(nd_id); 1474 ni->used = true; 1475 nb_nics++; 1476 } 1477 1478 out: 1479 g_free(nd_id); 1480 return ret; 1481 } 1482 1483 int net_init_clients(Error **errp) 1484 { 1485 net_change_state_entry = 1486 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1487 1488 QTAILQ_INIT(&net_clients); 1489 1490 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1491 net_init_netdev, NULL, errp)) { 1492 return -1; 1493 } 1494 1495 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1496 return -1; 1497 } 1498 1499 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1500 return -1; 1501 } 1502 1503 return 0; 1504 } 1505 1506 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1507 { 1508 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1509 return -1; 1510 } 1511 1512 return 0; 1513 } 1514 1515 /* From FreeBSD */ 1516 /* XXX: optimize */ 1517 uint32_t net_crc32(const uint8_t *p, int len) 1518 { 1519 uint32_t crc; 1520 int carry, i, j; 1521 uint8_t b; 1522 1523 crc = 0xffffffff; 1524 for (i = 0; i < len; i++) { 1525 b = *p++; 1526 for (j = 0; j < 8; j++) { 1527 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1528 crc <<= 1; 1529 b >>= 1; 1530 if (carry) { 1531 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1532 } 1533 } 1534 } 1535 1536 return crc; 1537 } 1538 1539 uint32_t net_crc32_le(const uint8_t *p, int len) 1540 { 1541 uint32_t crc; 1542 int carry, i, j; 1543 uint8_t b; 1544 1545 crc = 0xffffffff; 1546 for (i = 0; i < len; i++) { 1547 b = *p++; 1548 for (j = 0; j < 8; j++) { 1549 carry = (crc & 0x1) ^ (b & 0x01); 1550 crc >>= 1; 1551 b >>= 1; 1552 if (carry) { 1553 crc ^= POLYNOMIAL_LE; 1554 } 1555 } 1556 } 1557 1558 return crc; 1559 } 1560 1561 QemuOptsList qemu_netdev_opts = { 1562 .name = "netdev", 1563 .implied_opt_name = "type", 1564 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1565 .desc = { 1566 /* 1567 * no elements => accept any params 1568 * validation will happen later 1569 */ 1570 { /* end of list */ } 1571 }, 1572 }; 1573 1574 QemuOptsList qemu_nic_opts = { 1575 .name = "nic", 1576 .implied_opt_name = "type", 1577 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1578 .desc = { 1579 /* 1580 * no elements => accept any params 1581 * validation will happen later 1582 */ 1583 { /* end of list */ } 1584 }, 1585 }; 1586 1587 QemuOptsList qemu_net_opts = { 1588 .name = "net", 1589 .implied_opt_name = "type", 1590 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1591 .desc = { 1592 /* 1593 * no elements => accept any params 1594 * validation will happen later 1595 */ 1596 { /* end of list */ } 1597 }, 1598 }; 1599 1600 void net_socket_rs_init(SocketReadState *rs, 1601 SocketReadStateFinalize *finalize, 1602 bool vnet_hdr) 1603 { 1604 rs->state = 0; 1605 rs->vnet_hdr = vnet_hdr; 1606 rs->index = 0; 1607 rs->packet_len = 0; 1608 rs->vnet_hdr_len = 0; 1609 memset(rs->buf, 0, sizeof(rs->buf)); 1610 rs->finalize = finalize; 1611 } 1612 1613 /* 1614 * Returns 1615 * 0: success 1616 * -1: error occurs 1617 */ 1618 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1619 { 1620 unsigned int l; 1621 1622 while (size > 0) { 1623 /* Reassemble a packet from the network. 1624 * 0 = getting length. 1625 * 1 = getting vnet header length. 1626 * 2 = getting data. 1627 */ 1628 switch (rs->state) { 1629 case 0: 1630 l = 4 - rs->index; 1631 if (l > size) { 1632 l = size; 1633 } 1634 memcpy(rs->buf + rs->index, buf, l); 1635 buf += l; 1636 size -= l; 1637 rs->index += l; 1638 if (rs->index == 4) { 1639 /* got length */ 1640 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1641 rs->index = 0; 1642 if (rs->vnet_hdr) { 1643 rs->state = 1; 1644 } else { 1645 rs->state = 2; 1646 rs->vnet_hdr_len = 0; 1647 } 1648 } 1649 break; 1650 case 1: 1651 l = 4 - rs->index; 1652 if (l > size) { 1653 l = size; 1654 } 1655 memcpy(rs->buf + rs->index, buf, l); 1656 buf += l; 1657 size -= l; 1658 rs->index += l; 1659 if (rs->index == 4) { 1660 /* got vnet header length */ 1661 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1662 rs->index = 0; 1663 rs->state = 2; 1664 } 1665 break; 1666 case 2: 1667 l = rs->packet_len - rs->index; 1668 if (l > size) { 1669 l = size; 1670 } 1671 if (rs->index + l <= sizeof(rs->buf)) { 1672 memcpy(rs->buf + rs->index, buf, l); 1673 } else { 1674 fprintf(stderr, "serious error: oversized packet received," 1675 "connection terminated.\n"); 1676 rs->index = rs->state = 0; 1677 return -1; 1678 } 1679 1680 rs->index += l; 1681 buf += l; 1682 size -= l; 1683 if (rs->index >= rs->packet_len) { 1684 rs->index = 0; 1685 rs->state = 0; 1686 assert(rs->finalize); 1687 rs->finalize(rs); 1688 } 1689 break; 1690 } 1691 } 1692 1693 assert(size == 0); 1694 return 0; 1695 } 1696