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/qemu-print.h" 48 #include "qemu/main-loop.h" 49 #include "qemu/option.h" 50 #include "qapi/error.h" 51 #include "qapi/opts-visitor.h" 52 #include "sysemu/sysemu.h" 53 #include "sysemu/qtest.h" 54 #include "sysemu/runstate.h" 55 #include "sysemu/sysemu.h" 56 #include "net/filter.h" 57 #include "qapi/string-output-visitor.h" 58 59 /* Net bridge is currently not supported for W32. */ 60 #if !defined(_WIN32) 61 # define CONFIG_NET_BRIDGE 62 #endif 63 64 static VMChangeStateEntry *net_change_state_entry; 65 static QTAILQ_HEAD(, NetClientState) net_clients; 66 67 /***********************************************************/ 68 /* network device redirectors */ 69 70 int parse_host_port(struct sockaddr_in *saddr, const char *str, 71 Error **errp) 72 { 73 gchar **substrings; 74 struct hostent *he; 75 const char *addr, *p, *r; 76 int port, ret = 0; 77 78 substrings = g_strsplit(str, ":", 2); 79 if (!substrings || !substrings[0] || !substrings[1]) { 80 error_setg(errp, "host address '%s' doesn't contain ':' " 81 "separating host from port", str); 82 ret = -1; 83 goto out; 84 } 85 86 addr = substrings[0]; 87 p = substrings[1]; 88 89 saddr->sin_family = AF_INET; 90 if (addr[0] == '\0') { 91 saddr->sin_addr.s_addr = 0; 92 } else { 93 if (qemu_isdigit(addr[0])) { 94 if (!inet_aton(addr, &saddr->sin_addr)) { 95 error_setg(errp, "host address '%s' is not a valid " 96 "IPv4 address", addr); 97 ret = -1; 98 goto out; 99 } 100 } else { 101 he = gethostbyname(addr); 102 if (he == NULL) { 103 error_setg(errp, "can't resolve host address '%s'", addr); 104 ret = -1; 105 goto out; 106 } 107 saddr->sin_addr = *(struct in_addr *)he->h_addr; 108 } 109 } 110 port = strtol(p, (char **)&r, 0); 111 if (r == p) { 112 error_setg(errp, "port number '%s' is invalid", p); 113 ret = -1; 114 goto out; 115 } 116 saddr->sin_port = htons(port); 117 118 out: 119 g_strfreev(substrings); 120 return ret; 121 } 122 123 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 124 { 125 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 126 macaddr[0], macaddr[1], macaddr[2], 127 macaddr[3], macaddr[4], macaddr[5]); 128 } 129 130 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 131 { 132 snprintf(nc->info_str, sizeof(nc->info_str), 133 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 134 nc->model, 135 macaddr[0], macaddr[1], macaddr[2], 136 macaddr[3], macaddr[4], macaddr[5]); 137 } 138 139 static int mac_table[256] = {0}; 140 141 static void qemu_macaddr_set_used(MACAddr *macaddr) 142 { 143 int index; 144 145 for (index = 0x56; index < 0xFF; index++) { 146 if (macaddr->a[5] == index) { 147 mac_table[index]++; 148 } 149 } 150 } 151 152 static void qemu_macaddr_set_free(MACAddr *macaddr) 153 { 154 int index; 155 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 156 157 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 158 return; 159 } 160 for (index = 0x56; index < 0xFF; index++) { 161 if (macaddr->a[5] == index) { 162 mac_table[index]--; 163 } 164 } 165 } 166 167 static int qemu_macaddr_get_free(void) 168 { 169 int index; 170 171 for (index = 0x56; index < 0xFF; index++) { 172 if (mac_table[index] == 0) { 173 return index; 174 } 175 } 176 177 return -1; 178 } 179 180 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 181 { 182 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 183 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 184 185 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 186 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 187 return; 188 } else { 189 qemu_macaddr_set_used(macaddr); 190 return; 191 } 192 } 193 194 macaddr->a[0] = 0x52; 195 macaddr->a[1] = 0x54; 196 macaddr->a[2] = 0x00; 197 macaddr->a[3] = 0x12; 198 macaddr->a[4] = 0x34; 199 macaddr->a[5] = qemu_macaddr_get_free(); 200 qemu_macaddr_set_used(macaddr); 201 } 202 203 /** 204 * Generate a name for net client 205 * 206 * Only net clients created with the legacy -net option and NICs need this. 207 */ 208 static char *assign_name(NetClientState *nc1, const char *model) 209 { 210 NetClientState *nc; 211 int id = 0; 212 213 QTAILQ_FOREACH(nc, &net_clients, next) { 214 if (nc == nc1) { 215 continue; 216 } 217 if (strcmp(nc->model, model) == 0) { 218 id++; 219 } 220 } 221 222 return g_strdup_printf("%s.%d", model, id); 223 } 224 225 static void qemu_net_client_destructor(NetClientState *nc) 226 { 227 g_free(nc); 228 } 229 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 230 unsigned flags, 231 const struct iovec *iov, 232 int iovcnt, 233 void *opaque); 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 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 330 { 331 assert(nc != NULL); 332 NetClientState *ncs = nc + queue_index; 333 return ncs->peer; 334 } 335 336 static void qemu_cleanup_net_client(NetClientState *nc) 337 { 338 QTAILQ_REMOVE(&net_clients, nc, next); 339 340 if (nc->info->cleanup) { 341 nc->info->cleanup(nc); 342 } 343 } 344 345 static void qemu_free_net_client(NetClientState *nc) 346 { 347 if (nc->incoming_queue) { 348 qemu_del_net_queue(nc->incoming_queue); 349 } 350 if (nc->peer) { 351 nc->peer->peer = NULL; 352 } 353 g_free(nc->name); 354 g_free(nc->model); 355 if (nc->destructor) { 356 nc->destructor(nc); 357 } 358 } 359 360 void qemu_del_net_client(NetClientState *nc) 361 { 362 NetClientState *ncs[MAX_QUEUE_NUM]; 363 int queues, i; 364 NetFilterState *nf, *next; 365 366 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 367 368 /* If the NetClientState belongs to a multiqueue backend, we will change all 369 * other NetClientStates also. 370 */ 371 queues = qemu_find_net_clients_except(nc->name, ncs, 372 NET_CLIENT_DRIVER_NIC, 373 MAX_QUEUE_NUM); 374 assert(queues != 0); 375 376 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 377 object_unparent(OBJECT(nf)); 378 } 379 380 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 381 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 382 NICState *nic = qemu_get_nic(nc->peer); 383 if (nic->peer_deleted) { 384 return; 385 } 386 nic->peer_deleted = true; 387 388 for (i = 0; i < queues; i++) { 389 ncs[i]->peer->link_down = true; 390 } 391 392 if (nc->peer->info->link_status_changed) { 393 nc->peer->info->link_status_changed(nc->peer); 394 } 395 396 for (i = 0; i < queues; i++) { 397 qemu_cleanup_net_client(ncs[i]); 398 } 399 400 return; 401 } 402 403 for (i = 0; i < queues; i++) { 404 qemu_cleanup_net_client(ncs[i]); 405 qemu_free_net_client(ncs[i]); 406 } 407 } 408 409 void qemu_del_nic(NICState *nic) 410 { 411 int i, queues = MAX(nic->conf->peers.queues, 1); 412 413 qemu_macaddr_set_free(&nic->conf->macaddr); 414 415 for (i = 0; i < queues; i++) { 416 NetClientState *nc = qemu_get_subqueue(nic, i); 417 /* If this is a peer NIC and peer has already been deleted, free it now. */ 418 if (nic->peer_deleted) { 419 qemu_free_net_client(nc->peer); 420 } else if (nc->peer) { 421 /* if there are RX packets pending, complete them */ 422 qemu_purge_queued_packets(nc->peer); 423 } 424 } 425 426 for (i = queues - 1; i >= 0; i--) { 427 NetClientState *nc = qemu_get_subqueue(nic, i); 428 429 qemu_cleanup_net_client(nc); 430 qemu_free_net_client(nc); 431 } 432 433 g_free(nic); 434 } 435 436 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 437 { 438 NetClientState *nc; 439 440 QTAILQ_FOREACH(nc, &net_clients, next) { 441 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 442 if (nc->queue_index == 0) { 443 func(qemu_get_nic(nc), opaque); 444 } 445 } 446 } 447 } 448 449 bool qemu_has_ufo(NetClientState *nc) 450 { 451 if (!nc || !nc->info->has_ufo) { 452 return false; 453 } 454 455 return nc->info->has_ufo(nc); 456 } 457 458 bool qemu_has_vnet_hdr(NetClientState *nc) 459 { 460 if (!nc || !nc->info->has_vnet_hdr) { 461 return false; 462 } 463 464 return nc->info->has_vnet_hdr(nc); 465 } 466 467 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 468 { 469 if (!nc || !nc->info->has_vnet_hdr_len) { 470 return false; 471 } 472 473 return nc->info->has_vnet_hdr_len(nc, len); 474 } 475 476 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 477 { 478 if (!nc || !nc->info->using_vnet_hdr) { 479 return; 480 } 481 482 nc->info->using_vnet_hdr(nc, enable); 483 } 484 485 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 486 int ecn, int ufo) 487 { 488 if (!nc || !nc->info->set_offload) { 489 return; 490 } 491 492 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 493 } 494 495 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 496 { 497 if (!nc || !nc->info->set_vnet_hdr_len) { 498 return; 499 } 500 501 nc->vnet_hdr_len = len; 502 nc->info->set_vnet_hdr_len(nc, len); 503 } 504 505 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 506 { 507 #ifdef HOST_WORDS_BIGENDIAN 508 if (!nc || !nc->info->set_vnet_le) { 509 return -ENOSYS; 510 } 511 512 return nc->info->set_vnet_le(nc, is_le); 513 #else 514 return 0; 515 #endif 516 } 517 518 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 519 { 520 #ifdef HOST_WORDS_BIGENDIAN 521 return 0; 522 #else 523 if (!nc || !nc->info->set_vnet_be) { 524 return -ENOSYS; 525 } 526 527 return nc->info->set_vnet_be(nc, is_be); 528 #endif 529 } 530 531 int qemu_can_send_packet(NetClientState *sender) 532 { 533 int vm_running = runstate_is_running(); 534 535 if (!vm_running) { 536 return 0; 537 } 538 539 if (!sender->peer) { 540 return 1; 541 } 542 543 if (sender->peer->receive_disabled) { 544 return 0; 545 } else if (sender->peer->info->can_receive && 546 !sender->peer->info->can_receive(sender->peer)) { 547 return 0; 548 } 549 return 1; 550 } 551 552 static ssize_t filter_receive_iov(NetClientState *nc, 553 NetFilterDirection direction, 554 NetClientState *sender, 555 unsigned flags, 556 const struct iovec *iov, 557 int iovcnt, 558 NetPacketSent *sent_cb) 559 { 560 ssize_t ret = 0; 561 NetFilterState *nf = NULL; 562 563 if (direction == NET_FILTER_DIRECTION_TX) { 564 QTAILQ_FOREACH(nf, &nc->filters, next) { 565 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 566 iovcnt, sent_cb); 567 if (ret) { 568 return ret; 569 } 570 } 571 } else { 572 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 573 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 574 iovcnt, sent_cb); 575 if (ret) { 576 return ret; 577 } 578 } 579 } 580 581 return ret; 582 } 583 584 static ssize_t filter_receive(NetClientState *nc, 585 NetFilterDirection direction, 586 NetClientState *sender, 587 unsigned flags, 588 const uint8_t *data, 589 size_t size, 590 NetPacketSent *sent_cb) 591 { 592 struct iovec iov = { 593 .iov_base = (void *)data, 594 .iov_len = size 595 }; 596 597 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 598 } 599 600 void qemu_purge_queued_packets(NetClientState *nc) 601 { 602 if (!nc->peer) { 603 return; 604 } 605 606 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 607 } 608 609 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 610 { 611 nc->receive_disabled = 0; 612 613 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 614 if (net_hub_flush(nc->peer)) { 615 qemu_notify_event(); 616 } 617 } 618 if (qemu_net_queue_flush(nc->incoming_queue)) { 619 /* We emptied the queue successfully, signal to the IO thread to repoll 620 * the file descriptor (for tap, for example). 621 */ 622 qemu_notify_event(); 623 } else if (purge) { 624 /* Unable to empty the queue, purge remaining packets */ 625 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 626 } 627 } 628 629 void qemu_flush_queued_packets(NetClientState *nc) 630 { 631 qemu_flush_or_purge_queued_packets(nc, false); 632 } 633 634 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 635 unsigned flags, 636 const uint8_t *buf, int size, 637 NetPacketSent *sent_cb) 638 { 639 NetQueue *queue; 640 int ret; 641 642 #ifdef DEBUG_NET 643 printf("qemu_send_packet_async:\n"); 644 qemu_hexdump(stdout, "net", buf, size); 645 #endif 646 647 if (sender->link_down || !sender->peer) { 648 return size; 649 } 650 651 /* Let filters handle the packet first */ 652 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 653 sender, flags, buf, size, sent_cb); 654 if (ret) { 655 return ret; 656 } 657 658 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 659 sender, flags, buf, size, sent_cb); 660 if (ret) { 661 return ret; 662 } 663 664 queue = sender->peer->incoming_queue; 665 666 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 667 } 668 669 ssize_t qemu_send_packet_async(NetClientState *sender, 670 const uint8_t *buf, int size, 671 NetPacketSent *sent_cb) 672 { 673 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 674 buf, size, sent_cb); 675 } 676 677 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 678 { 679 return qemu_send_packet_async(nc, buf, size, NULL); 680 } 681 682 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 683 { 684 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 685 buf, size, NULL); 686 } 687 688 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 689 int iovcnt, unsigned flags) 690 { 691 uint8_t *buf = NULL; 692 uint8_t *buffer; 693 size_t offset; 694 ssize_t ret; 695 696 if (iovcnt == 1) { 697 buffer = iov[0].iov_base; 698 offset = iov[0].iov_len; 699 } else { 700 offset = iov_size(iov, iovcnt); 701 if (offset > NET_BUFSIZE) { 702 return -1; 703 } 704 buf = g_malloc(offset); 705 buffer = buf; 706 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 707 } 708 709 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 710 ret = nc->info->receive_raw(nc, buffer, offset); 711 } else { 712 ret = nc->info->receive(nc, buffer, offset); 713 } 714 715 g_free(buf); 716 return ret; 717 } 718 719 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 720 unsigned flags, 721 const struct iovec *iov, 722 int iovcnt, 723 void *opaque) 724 { 725 NetClientState *nc = opaque; 726 int ret; 727 728 729 if (nc->link_down) { 730 return iov_size(iov, iovcnt); 731 } 732 733 if (nc->receive_disabled) { 734 return 0; 735 } 736 737 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 738 ret = nc->info->receive_iov(nc, iov, iovcnt); 739 } else { 740 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 741 } 742 743 if (ret == 0) { 744 nc->receive_disabled = 1; 745 } 746 747 return ret; 748 } 749 750 ssize_t qemu_sendv_packet_async(NetClientState *sender, 751 const struct iovec *iov, int iovcnt, 752 NetPacketSent *sent_cb) 753 { 754 NetQueue *queue; 755 size_t size = iov_size(iov, iovcnt); 756 int ret; 757 758 if (size > NET_BUFSIZE) { 759 return size; 760 } 761 762 if (sender->link_down || !sender->peer) { 763 return size; 764 } 765 766 /* Let filters handle the packet first */ 767 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 768 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 769 if (ret) { 770 return ret; 771 } 772 773 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 774 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 775 if (ret) { 776 return ret; 777 } 778 779 queue = sender->peer->incoming_queue; 780 781 return qemu_net_queue_send_iov(queue, sender, 782 QEMU_NET_PACKET_FLAG_NONE, 783 iov, iovcnt, sent_cb); 784 } 785 786 ssize_t 787 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 788 { 789 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 790 } 791 792 NetClientState *qemu_find_netdev(const char *id) 793 { 794 NetClientState *nc; 795 796 QTAILQ_FOREACH(nc, &net_clients, next) { 797 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 798 continue; 799 if (!strcmp(nc->name, id)) { 800 return nc; 801 } 802 } 803 804 return NULL; 805 } 806 807 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 808 NetClientDriver type, int max) 809 { 810 NetClientState *nc; 811 int ret = 0; 812 813 QTAILQ_FOREACH(nc, &net_clients, next) { 814 if (nc->info->type == type) { 815 continue; 816 } 817 if (!id || !strcmp(nc->name, id)) { 818 if (ret < max) { 819 ncs[ret] = nc; 820 } 821 ret++; 822 } 823 } 824 825 return ret; 826 } 827 828 static int nic_get_free_idx(void) 829 { 830 int index; 831 832 for (index = 0; index < MAX_NICS; index++) 833 if (!nd_table[index].used) 834 return index; 835 return -1; 836 } 837 838 int qemu_show_nic_models(const char *arg, const char *const *models) 839 { 840 int i; 841 842 if (!arg || !is_help_option(arg)) { 843 return 0; 844 } 845 846 printf("Supported NIC models:\n"); 847 for (i = 0 ; models[i]; i++) { 848 printf("%s\n", models[i]); 849 } 850 return 1; 851 } 852 853 void qemu_check_nic_model(NICInfo *nd, const char *model) 854 { 855 const char *models[2]; 856 857 models[0] = model; 858 models[1] = NULL; 859 860 if (qemu_show_nic_models(nd->model, models)) 861 exit(0); 862 if (qemu_find_nic_model(nd, models, model) < 0) 863 exit(1); 864 } 865 866 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 867 const char *default_model) 868 { 869 int i; 870 871 if (!nd->model) 872 nd->model = g_strdup(default_model); 873 874 for (i = 0 ; models[i]; i++) { 875 if (strcmp(nd->model, models[i]) == 0) 876 return i; 877 } 878 879 error_report("Unsupported NIC model: %s", nd->model); 880 return -1; 881 } 882 883 static int net_init_nic(const Netdev *netdev, const char *name, 884 NetClientState *peer, Error **errp) 885 { 886 int idx; 887 NICInfo *nd; 888 const NetLegacyNicOptions *nic; 889 890 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 891 nic = &netdev->u.nic; 892 893 idx = nic_get_free_idx(); 894 if (idx == -1 || nb_nics >= MAX_NICS) { 895 error_setg(errp, "too many NICs"); 896 return -1; 897 } 898 899 nd = &nd_table[idx]; 900 901 memset(nd, 0, sizeof(*nd)); 902 903 if (nic->has_netdev) { 904 nd->netdev = qemu_find_netdev(nic->netdev); 905 if (!nd->netdev) { 906 error_setg(errp, "netdev '%s' not found", nic->netdev); 907 return -1; 908 } 909 } else { 910 assert(peer); 911 nd->netdev = peer; 912 } 913 nd->name = g_strdup(name); 914 if (nic->has_model) { 915 nd->model = g_strdup(nic->model); 916 } 917 if (nic->has_addr) { 918 nd->devaddr = g_strdup(nic->addr); 919 } 920 921 if (nic->has_macaddr && 922 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 923 error_setg(errp, "invalid syntax for ethernet address"); 924 return -1; 925 } 926 if (nic->has_macaddr && 927 is_multicast_ether_addr(nd->macaddr.a)) { 928 error_setg(errp, 929 "NIC cannot have multicast MAC address (odd 1st byte)"); 930 return -1; 931 } 932 qemu_macaddr_default_if_unset(&nd->macaddr); 933 934 if (nic->has_vectors) { 935 if (nic->vectors > 0x7ffffff) { 936 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 937 return -1; 938 } 939 nd->nvectors = nic->vectors; 940 } else { 941 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 942 } 943 944 nd->used = 1; 945 nb_nics++; 946 947 return idx; 948 } 949 950 951 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 952 const Netdev *netdev, 953 const char *name, 954 NetClientState *peer, Error **errp) = { 955 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 956 #ifdef CONFIG_SLIRP 957 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 958 #endif 959 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 960 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 961 #ifdef CONFIG_VDE 962 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 963 #endif 964 #ifdef CONFIG_NETMAP 965 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 966 #endif 967 #ifdef CONFIG_NET_BRIDGE 968 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 969 #endif 970 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 971 #ifdef CONFIG_VHOST_NET_USER 972 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 973 #endif 974 #ifdef CONFIG_VHOST_NET_VDPA 975 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 976 #endif 977 #ifdef CONFIG_L2TPV3 978 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 979 #endif 980 }; 981 982 983 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 984 { 985 NetClientState *peer = NULL; 986 987 if (is_netdev) { 988 if (netdev->type == NET_CLIENT_DRIVER_NIC || 989 !net_client_init_fun[netdev->type]) { 990 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 991 "a netdev backend type"); 992 return -1; 993 } 994 } else { 995 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 996 return 0; /* nothing to do */ 997 } 998 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 999 !net_client_init_fun[netdev->type]) { 1000 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1001 "a net backend type (maybe it is not compiled " 1002 "into this binary)"); 1003 return -1; 1004 } 1005 1006 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1007 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1008 !netdev->u.nic.has_netdev) { 1009 peer = net_hub_add_port(0, NULL, NULL); 1010 } 1011 } 1012 1013 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1014 /* FIXME drop when all init functions store an Error */ 1015 if (errp && !*errp) { 1016 error_setg(errp, "Device '%s' could not be initialized", 1017 NetClientDriver_str(netdev->type)); 1018 } 1019 return -1; 1020 } 1021 1022 if (is_netdev) { 1023 NetClientState *nc; 1024 1025 nc = qemu_find_netdev(netdev->id); 1026 assert(nc); 1027 nc->is_netdev = true; 1028 } 1029 1030 return 0; 1031 } 1032 1033 void show_netdevs(void) 1034 { 1035 int idx; 1036 const char *available_netdevs[] = { 1037 "socket", 1038 "hubport", 1039 "tap", 1040 #ifdef CONFIG_SLIRP 1041 "user", 1042 #endif 1043 #ifdef CONFIG_L2TPV3 1044 "l2tpv3", 1045 #endif 1046 #ifdef CONFIG_VDE 1047 "vde", 1048 #endif 1049 #ifdef CONFIG_NET_BRIDGE 1050 "bridge", 1051 #endif 1052 #ifdef CONFIG_NETMAP 1053 "netmap", 1054 #endif 1055 #ifdef CONFIG_POSIX 1056 "vhost-user", 1057 #endif 1058 #ifdef CONFIG_VHOST_VDPA 1059 "vhost-vdpa", 1060 #endif 1061 }; 1062 1063 qemu_printf("Available netdev backend types:\n"); 1064 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1065 qemu_printf("%s\n", available_netdevs[idx]); 1066 } 1067 } 1068 1069 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1070 { 1071 gchar **substrings = NULL; 1072 Netdev *object = NULL; 1073 int ret = -1; 1074 Visitor *v = opts_visitor_new(opts); 1075 1076 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1077 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1078 1079 if (ip6_net) { 1080 char *prefix_addr; 1081 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1082 1083 substrings = g_strsplit(ip6_net, "/", 2); 1084 if (!substrings || !substrings[0]) { 1085 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1086 "a valid IPv6 prefix"); 1087 goto out; 1088 } 1089 1090 prefix_addr = substrings[0]; 1091 1092 /* Handle user-specified prefix length. */ 1093 if (substrings[1] && 1094 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1095 { 1096 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1097 "ipv6-prefixlen", "a number"); 1098 goto out; 1099 } 1100 1101 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1102 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1103 &error_abort); 1104 qemu_opt_unset(opts, "ipv6-net"); 1105 } 1106 1107 /* Create an ID for -net if the user did not specify one */ 1108 if (!is_netdev && !qemu_opts_id(opts)) { 1109 static int idx; 1110 qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++)); 1111 } 1112 1113 if (visit_type_Netdev(v, NULL, &object, errp)) { 1114 ret = net_client_init1(object, is_netdev, errp); 1115 } 1116 1117 qapi_free_Netdev(object); 1118 1119 out: 1120 g_strfreev(substrings); 1121 visit_free(v); 1122 return ret; 1123 } 1124 1125 void netdev_add(QemuOpts *opts, Error **errp) 1126 { 1127 net_client_init(opts, true, errp); 1128 } 1129 1130 void qmp_netdev_add(Netdev *netdev, Error **errp) 1131 { 1132 net_client_init1(netdev, true, errp); 1133 } 1134 1135 void qmp_netdev_del(const char *id, Error **errp) 1136 { 1137 NetClientState *nc; 1138 1139 nc = qemu_find_netdev(id); 1140 if (!nc) { 1141 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1142 "Device '%s' not found", id); 1143 return; 1144 } 1145 1146 if (!nc->is_netdev) { 1147 error_setg(errp, "Device '%s' is not a netdev", id); 1148 return; 1149 } 1150 1151 qemu_del_net_client(nc); 1152 } 1153 1154 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1155 { 1156 char *str; 1157 ObjectProperty *prop; 1158 ObjectPropertyIterator iter; 1159 Visitor *v; 1160 1161 /* generate info str */ 1162 object_property_iter_init(&iter, OBJECT(nf)); 1163 while ((prop = object_property_iter_next(&iter))) { 1164 if (!strcmp(prop->name, "type")) { 1165 continue; 1166 } 1167 v = string_output_visitor_new(false, &str); 1168 object_property_get(OBJECT(nf), prop->name, v, NULL); 1169 visit_complete(v, &str); 1170 visit_free(v); 1171 monitor_printf(mon, ",%s=%s", prop->name, str); 1172 g_free(str); 1173 } 1174 monitor_printf(mon, "\n"); 1175 } 1176 1177 void print_net_client(Monitor *mon, NetClientState *nc) 1178 { 1179 NetFilterState *nf; 1180 1181 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1182 nc->queue_index, 1183 NetClientDriver_str(nc->info->type), 1184 nc->info_str); 1185 if (!QTAILQ_EMPTY(&nc->filters)) { 1186 monitor_printf(mon, "filters:\n"); 1187 } 1188 QTAILQ_FOREACH(nf, &nc->filters, next) { 1189 monitor_printf(mon, " - %s: type=%s", 1190 object_get_canonical_path_component(OBJECT(nf)), 1191 object_get_typename(OBJECT(nf))); 1192 netfilter_print_info(mon, nf); 1193 } 1194 } 1195 1196 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1197 Error **errp) 1198 { 1199 NetClientState *nc; 1200 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1201 1202 QTAILQ_FOREACH(nc, &net_clients, next) { 1203 RxFilterInfoList *entry; 1204 RxFilterInfo *info; 1205 1206 if (has_name && strcmp(nc->name, name) != 0) { 1207 continue; 1208 } 1209 1210 /* only query rx-filter information of NIC */ 1211 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1212 if (has_name) { 1213 error_setg(errp, "net client(%s) isn't a NIC", name); 1214 return NULL; 1215 } 1216 continue; 1217 } 1218 1219 /* only query information on queue 0 since the info is per nic, 1220 * not per queue 1221 */ 1222 if (nc->queue_index != 0) 1223 continue; 1224 1225 if (nc->info->query_rx_filter) { 1226 info = nc->info->query_rx_filter(nc); 1227 entry = g_malloc0(sizeof(*entry)); 1228 entry->value = info; 1229 1230 if (!filter_list) { 1231 filter_list = entry; 1232 } else { 1233 last_entry->next = entry; 1234 } 1235 last_entry = entry; 1236 } else if (has_name) { 1237 error_setg(errp, "net client(%s) doesn't support" 1238 " rx-filter querying", name); 1239 return NULL; 1240 } 1241 1242 if (has_name) { 1243 break; 1244 } 1245 } 1246 1247 if (filter_list == NULL && has_name) { 1248 error_setg(errp, "invalid net client name: %s", name); 1249 } 1250 1251 return filter_list; 1252 } 1253 1254 void hmp_info_network(Monitor *mon, const QDict *qdict) 1255 { 1256 NetClientState *nc, *peer; 1257 NetClientDriver type; 1258 1259 net_hub_info(mon); 1260 1261 QTAILQ_FOREACH(nc, &net_clients, next) { 1262 peer = nc->peer; 1263 type = nc->info->type; 1264 1265 /* Skip if already printed in hub info */ 1266 if (net_hub_id_for_client(nc, NULL) == 0) { 1267 continue; 1268 } 1269 1270 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1271 print_net_client(mon, nc); 1272 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1273 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1274 monitor_printf(mon, " \\ "); 1275 print_net_client(mon, peer); 1276 } 1277 } 1278 } 1279 1280 void colo_notify_filters_event(int event, Error **errp) 1281 { 1282 NetClientState *nc; 1283 NetFilterState *nf; 1284 NetFilterClass *nfc = NULL; 1285 Error *local_err = NULL; 1286 1287 QTAILQ_FOREACH(nc, &net_clients, next) { 1288 QTAILQ_FOREACH(nf, &nc->filters, next) { 1289 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1290 nfc->handle_event(nf, event, &local_err); 1291 if (local_err) { 1292 error_propagate(errp, local_err); 1293 return; 1294 } 1295 } 1296 } 1297 } 1298 1299 void qmp_set_link(const char *name, bool up, Error **errp) 1300 { 1301 NetClientState *ncs[MAX_QUEUE_NUM]; 1302 NetClientState *nc; 1303 int queues, i; 1304 1305 queues = qemu_find_net_clients_except(name, ncs, 1306 NET_CLIENT_DRIVER__MAX, 1307 MAX_QUEUE_NUM); 1308 1309 if (queues == 0) { 1310 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1311 "Device '%s' not found", name); 1312 return; 1313 } 1314 nc = ncs[0]; 1315 1316 for (i = 0; i < queues; i++) { 1317 ncs[i]->link_down = !up; 1318 } 1319 1320 if (nc->info->link_status_changed) { 1321 nc->info->link_status_changed(nc); 1322 } 1323 1324 if (nc->peer) { 1325 /* Change peer link only if the peer is NIC and then notify peer. 1326 * If the peer is a HUBPORT or a backend, we do not change the 1327 * link status. 1328 * 1329 * This behavior is compatible with qemu hubs where there could be 1330 * multiple clients that can still communicate with each other in 1331 * disconnected mode. For now maintain this compatibility. 1332 */ 1333 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1334 for (i = 0; i < queues; i++) { 1335 ncs[i]->peer->link_down = !up; 1336 } 1337 } 1338 if (nc->peer->info->link_status_changed) { 1339 nc->peer->info->link_status_changed(nc->peer); 1340 } 1341 } 1342 } 1343 1344 static void net_vm_change_state_handler(void *opaque, int running, 1345 RunState state) 1346 { 1347 NetClientState *nc; 1348 NetClientState *tmp; 1349 1350 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1351 if (running) { 1352 /* Flush queued packets and wake up backends. */ 1353 if (nc->peer && qemu_can_send_packet(nc)) { 1354 qemu_flush_queued_packets(nc->peer); 1355 } 1356 } else { 1357 /* Complete all queued packets, to guarantee we don't modify 1358 * state later when VM is not running. 1359 */ 1360 qemu_flush_or_purge_queued_packets(nc, true); 1361 } 1362 } 1363 } 1364 1365 void net_cleanup(void) 1366 { 1367 NetClientState *nc; 1368 1369 /* We may del multiple entries during qemu_del_net_client(), 1370 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1371 */ 1372 while (!QTAILQ_EMPTY(&net_clients)) { 1373 nc = QTAILQ_FIRST(&net_clients); 1374 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1375 qemu_del_nic(qemu_get_nic(nc)); 1376 } else { 1377 qemu_del_net_client(nc); 1378 } 1379 } 1380 1381 qemu_del_vm_change_state_handler(net_change_state_entry); 1382 } 1383 1384 void net_check_clients(void) 1385 { 1386 NetClientState *nc; 1387 int i; 1388 1389 net_hub_check_clients(); 1390 1391 QTAILQ_FOREACH(nc, &net_clients, next) { 1392 if (!nc->peer) { 1393 warn_report("%s %s has no peer", 1394 nc->info->type == NET_CLIENT_DRIVER_NIC 1395 ? "nic" : "netdev", 1396 nc->name); 1397 } 1398 } 1399 1400 /* Check that all NICs requested via -net nic actually got created. 1401 * NICs created via -device don't need to be checked here because 1402 * they are always instantiated. 1403 */ 1404 for (i = 0; i < MAX_NICS; i++) { 1405 NICInfo *nd = &nd_table[i]; 1406 if (nd->used && !nd->instantiated) { 1407 warn_report("requested NIC (%s, model %s) " 1408 "was not created (not supported by this machine?)", 1409 nd->name ? nd->name : "anonymous", 1410 nd->model ? nd->model : "unspecified"); 1411 } 1412 } 1413 } 1414 1415 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1416 { 1417 return net_client_init(opts, false, errp); 1418 } 1419 1420 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1421 { 1422 const char *type = qemu_opt_get(opts, "type"); 1423 1424 if (type && is_help_option(type)) { 1425 show_netdevs(); 1426 exit(0); 1427 } 1428 return net_client_init(opts, true, errp); 1429 } 1430 1431 /* For the convenience "--nic" parameter */ 1432 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1433 { 1434 char *mac, *nd_id; 1435 int idx, ret; 1436 NICInfo *ni; 1437 const char *type; 1438 1439 type = qemu_opt_get(opts, "type"); 1440 if (type && g_str_equal(type, "none")) { 1441 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1442 } 1443 1444 idx = nic_get_free_idx(); 1445 if (idx == -1 || nb_nics >= MAX_NICS) { 1446 error_setg(errp, "no more on-board/default NIC slots available"); 1447 return -1; 1448 } 1449 1450 if (!type) { 1451 qemu_opt_set(opts, "type", "user", &error_abort); 1452 } 1453 1454 ni = &nd_table[idx]; 1455 memset(ni, 0, sizeof(*ni)); 1456 ni->model = qemu_opt_get_del(opts, "model"); 1457 1458 /* Create an ID if the user did not specify one */ 1459 nd_id = g_strdup(qemu_opts_id(opts)); 1460 if (!nd_id) { 1461 nd_id = g_strdup_printf("__org.qemu.nic%i", idx); 1462 qemu_opts_set_id(opts, nd_id); 1463 } 1464 1465 /* Handle MAC address */ 1466 mac = qemu_opt_get_del(opts, "mac"); 1467 if (mac) { 1468 ret = net_parse_macaddr(ni->macaddr.a, mac); 1469 g_free(mac); 1470 if (ret) { 1471 error_setg(errp, "invalid syntax for ethernet address"); 1472 goto out; 1473 } 1474 if (is_multicast_ether_addr(ni->macaddr.a)) { 1475 error_setg(errp, "NIC cannot have multicast MAC address"); 1476 ret = -1; 1477 goto out; 1478 } 1479 } 1480 qemu_macaddr_default_if_unset(&ni->macaddr); 1481 1482 ret = net_client_init(opts, true, errp); 1483 if (ret == 0) { 1484 ni->netdev = qemu_find_netdev(nd_id); 1485 ni->used = true; 1486 nb_nics++; 1487 } 1488 1489 out: 1490 g_free(nd_id); 1491 return ret; 1492 } 1493 1494 int net_init_clients(Error **errp) 1495 { 1496 net_change_state_entry = 1497 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1498 1499 QTAILQ_INIT(&net_clients); 1500 1501 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1502 net_init_netdev, NULL, errp)) { 1503 return -1; 1504 } 1505 1506 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1507 return -1; 1508 } 1509 1510 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1511 return -1; 1512 } 1513 1514 return 0; 1515 } 1516 1517 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1518 { 1519 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1520 return -1; 1521 } 1522 1523 return 0; 1524 } 1525 1526 /* From FreeBSD */ 1527 /* XXX: optimize */ 1528 uint32_t net_crc32(const uint8_t *p, int len) 1529 { 1530 uint32_t crc; 1531 int carry, i, j; 1532 uint8_t b; 1533 1534 crc = 0xffffffff; 1535 for (i = 0; i < len; i++) { 1536 b = *p++; 1537 for (j = 0; j < 8; j++) { 1538 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1539 crc <<= 1; 1540 b >>= 1; 1541 if (carry) { 1542 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1543 } 1544 } 1545 } 1546 1547 return crc; 1548 } 1549 1550 uint32_t net_crc32_le(const uint8_t *p, int len) 1551 { 1552 uint32_t crc; 1553 int carry, i, j; 1554 uint8_t b; 1555 1556 crc = 0xffffffff; 1557 for (i = 0; i < len; i++) { 1558 b = *p++; 1559 for (j = 0; j < 8; j++) { 1560 carry = (crc & 0x1) ^ (b & 0x01); 1561 crc >>= 1; 1562 b >>= 1; 1563 if (carry) { 1564 crc ^= POLYNOMIAL_LE; 1565 } 1566 } 1567 } 1568 1569 return crc; 1570 } 1571 1572 QemuOptsList qemu_netdev_opts = { 1573 .name = "netdev", 1574 .implied_opt_name = "type", 1575 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1576 .desc = { 1577 /* 1578 * no elements => accept any params 1579 * validation will happen later 1580 */ 1581 { /* end of list */ } 1582 }, 1583 }; 1584 1585 QemuOptsList qemu_nic_opts = { 1586 .name = "nic", 1587 .implied_opt_name = "type", 1588 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1589 .desc = { 1590 /* 1591 * no elements => accept any params 1592 * validation will happen later 1593 */ 1594 { /* end of list */ } 1595 }, 1596 }; 1597 1598 QemuOptsList qemu_net_opts = { 1599 .name = "net", 1600 .implied_opt_name = "type", 1601 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1602 .desc = { 1603 /* 1604 * no elements => accept any params 1605 * validation will happen later 1606 */ 1607 { /* end of list */ } 1608 }, 1609 }; 1610 1611 void net_socket_rs_init(SocketReadState *rs, 1612 SocketReadStateFinalize *finalize, 1613 bool vnet_hdr) 1614 { 1615 rs->state = 0; 1616 rs->vnet_hdr = vnet_hdr; 1617 rs->index = 0; 1618 rs->packet_len = 0; 1619 rs->vnet_hdr_len = 0; 1620 memset(rs->buf, 0, sizeof(rs->buf)); 1621 rs->finalize = finalize; 1622 } 1623 1624 /* 1625 * Returns 1626 * 0: success 1627 * -1: error occurs 1628 */ 1629 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1630 { 1631 unsigned int l; 1632 1633 while (size > 0) { 1634 /* Reassemble a packet from the network. 1635 * 0 = getting length. 1636 * 1 = getting vnet header length. 1637 * 2 = getting data. 1638 */ 1639 switch (rs->state) { 1640 case 0: 1641 l = 4 - rs->index; 1642 if (l > size) { 1643 l = size; 1644 } 1645 memcpy(rs->buf + rs->index, buf, l); 1646 buf += l; 1647 size -= l; 1648 rs->index += l; 1649 if (rs->index == 4) { 1650 /* got length */ 1651 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1652 rs->index = 0; 1653 if (rs->vnet_hdr) { 1654 rs->state = 1; 1655 } else { 1656 rs->state = 2; 1657 rs->vnet_hdr_len = 0; 1658 } 1659 } 1660 break; 1661 case 1: 1662 l = 4 - rs->index; 1663 if (l > size) { 1664 l = size; 1665 } 1666 memcpy(rs->buf + rs->index, buf, l); 1667 buf += l; 1668 size -= l; 1669 rs->index += l; 1670 if (rs->index == 4) { 1671 /* got vnet header length */ 1672 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1673 rs->index = 0; 1674 rs->state = 2; 1675 } 1676 break; 1677 case 2: 1678 l = rs->packet_len - rs->index; 1679 if (l > size) { 1680 l = size; 1681 } 1682 if (rs->index + l <= sizeof(rs->buf)) { 1683 memcpy(rs->buf + rs->index, buf, l); 1684 } else { 1685 fprintf(stderr, "serious error: oversized packet received," 1686 "connection terminated.\n"); 1687 rs->index = rs->state = 0; 1688 return -1; 1689 } 1690 1691 rs->index += l; 1692 buf += l; 1693 size -= l; 1694 if (rs->index >= rs->packet_len) { 1695 rs->index = 0; 1696 rs->state = 0; 1697 assert(rs->finalize); 1698 rs->finalize(rs); 1699 } 1700 break; 1701 } 1702 } 1703 1704 assert(size == 0); 1705 return 0; 1706 } 1707