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/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 for (i = 0; i < queues; i++) { 415 NetClientState *nc = qemu_get_subqueue(nic, i); 416 /* If this is a peer NIC and peer has already been deleted, free it now. */ 417 if (nic->peer_deleted) { 418 qemu_free_net_client(nc->peer); 419 } else if (nc->peer) { 420 /* if there are RX packets pending, complete them */ 421 qemu_purge_queued_packets(nc->peer); 422 } 423 } 424 425 for (i = queues - 1; i >= 0; i--) { 426 NetClientState *nc = qemu_get_subqueue(nic, i); 427 428 qemu_cleanup_net_client(nc); 429 qemu_free_net_client(nc); 430 } 431 432 g_free(nic); 433 } 434 435 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 436 { 437 NetClientState *nc; 438 439 QTAILQ_FOREACH(nc, &net_clients, next) { 440 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 441 if (nc->queue_index == 0) { 442 func(qemu_get_nic(nc), opaque); 443 } 444 } 445 } 446 } 447 448 bool qemu_has_ufo(NetClientState *nc) 449 { 450 if (!nc || !nc->info->has_ufo) { 451 return false; 452 } 453 454 return nc->info->has_ufo(nc); 455 } 456 457 bool qemu_has_vnet_hdr(NetClientState *nc) 458 { 459 if (!nc || !nc->info->has_vnet_hdr) { 460 return false; 461 } 462 463 return nc->info->has_vnet_hdr(nc); 464 } 465 466 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 467 { 468 if (!nc || !nc->info->has_vnet_hdr_len) { 469 return false; 470 } 471 472 return nc->info->has_vnet_hdr_len(nc, len); 473 } 474 475 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 476 { 477 if (!nc || !nc->info->using_vnet_hdr) { 478 return; 479 } 480 481 nc->info->using_vnet_hdr(nc, enable); 482 } 483 484 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 485 int ecn, int ufo) 486 { 487 if (!nc || !nc->info->set_offload) { 488 return; 489 } 490 491 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 492 } 493 494 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 495 { 496 if (!nc || !nc->info->set_vnet_hdr_len) { 497 return; 498 } 499 500 nc->vnet_hdr_len = len; 501 nc->info->set_vnet_hdr_len(nc, len); 502 } 503 504 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 505 { 506 #ifdef HOST_WORDS_BIGENDIAN 507 if (!nc || !nc->info->set_vnet_le) { 508 return -ENOSYS; 509 } 510 511 return nc->info->set_vnet_le(nc, is_le); 512 #else 513 return 0; 514 #endif 515 } 516 517 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 518 { 519 #ifdef HOST_WORDS_BIGENDIAN 520 return 0; 521 #else 522 if (!nc || !nc->info->set_vnet_be) { 523 return -ENOSYS; 524 } 525 526 return nc->info->set_vnet_be(nc, is_be); 527 #endif 528 } 529 530 int qemu_can_send_packet(NetClientState *sender) 531 { 532 int vm_running = runstate_is_running(); 533 534 if (!vm_running) { 535 return 0; 536 } 537 538 if (!sender->peer) { 539 return 1; 540 } 541 542 if (sender->peer->receive_disabled) { 543 return 0; 544 } else if (sender->peer->info->can_receive && 545 !sender->peer->info->can_receive(sender->peer)) { 546 return 0; 547 } 548 return 1; 549 } 550 551 static ssize_t filter_receive_iov(NetClientState *nc, 552 NetFilterDirection direction, 553 NetClientState *sender, 554 unsigned flags, 555 const struct iovec *iov, 556 int iovcnt, 557 NetPacketSent *sent_cb) 558 { 559 ssize_t ret = 0; 560 NetFilterState *nf = NULL; 561 562 if (direction == NET_FILTER_DIRECTION_TX) { 563 QTAILQ_FOREACH(nf, &nc->filters, next) { 564 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 565 iovcnt, sent_cb); 566 if (ret) { 567 return ret; 568 } 569 } 570 } else { 571 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 572 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 573 iovcnt, sent_cb); 574 if (ret) { 575 return ret; 576 } 577 } 578 } 579 580 return ret; 581 } 582 583 static ssize_t filter_receive(NetClientState *nc, 584 NetFilterDirection direction, 585 NetClientState *sender, 586 unsigned flags, 587 const uint8_t *data, 588 size_t size, 589 NetPacketSent *sent_cb) 590 { 591 struct iovec iov = { 592 .iov_base = (void *)data, 593 .iov_len = size 594 }; 595 596 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 597 } 598 599 void qemu_purge_queued_packets(NetClientState *nc) 600 { 601 if (!nc->peer) { 602 return; 603 } 604 605 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 606 } 607 608 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 609 { 610 nc->receive_disabled = 0; 611 612 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 613 if (net_hub_flush(nc->peer)) { 614 qemu_notify_event(); 615 } 616 } 617 if (qemu_net_queue_flush(nc->incoming_queue)) { 618 /* We emptied the queue successfully, signal to the IO thread to repoll 619 * the file descriptor (for tap, for example). 620 */ 621 qemu_notify_event(); 622 } else if (purge) { 623 /* Unable to empty the queue, purge remaining packets */ 624 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 625 } 626 } 627 628 void qemu_flush_queued_packets(NetClientState *nc) 629 { 630 qemu_flush_or_purge_queued_packets(nc, false); 631 } 632 633 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 634 unsigned flags, 635 const uint8_t *buf, int size, 636 NetPacketSent *sent_cb) 637 { 638 NetQueue *queue; 639 int ret; 640 641 #ifdef DEBUG_NET 642 printf("qemu_send_packet_async:\n"); 643 qemu_hexdump(stdout, "net", buf, size); 644 #endif 645 646 if (sender->link_down || !sender->peer) { 647 return size; 648 } 649 650 /* Let filters handle the packet first */ 651 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 652 sender, flags, buf, size, sent_cb); 653 if (ret) { 654 return ret; 655 } 656 657 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 658 sender, flags, buf, size, sent_cb); 659 if (ret) { 660 return ret; 661 } 662 663 queue = sender->peer->incoming_queue; 664 665 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 666 } 667 668 ssize_t qemu_send_packet_async(NetClientState *sender, 669 const uint8_t *buf, int size, 670 NetPacketSent *sent_cb) 671 { 672 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 673 buf, size, sent_cb); 674 } 675 676 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 677 { 678 return qemu_send_packet_async(nc, buf, size, NULL); 679 } 680 681 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 682 { 683 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 684 buf, size, NULL); 685 } 686 687 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 688 int iovcnt, unsigned flags) 689 { 690 uint8_t *buf = NULL; 691 uint8_t *buffer; 692 size_t offset; 693 ssize_t ret; 694 695 if (iovcnt == 1) { 696 buffer = iov[0].iov_base; 697 offset = iov[0].iov_len; 698 } else { 699 offset = iov_size(iov, iovcnt); 700 if (offset > NET_BUFSIZE) { 701 return -1; 702 } 703 buf = g_malloc(offset); 704 buffer = buf; 705 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 706 } 707 708 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 709 ret = nc->info->receive_raw(nc, buffer, offset); 710 } else { 711 ret = nc->info->receive(nc, buffer, offset); 712 } 713 714 g_free(buf); 715 return ret; 716 } 717 718 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 719 unsigned flags, 720 const struct iovec *iov, 721 int iovcnt, 722 void *opaque) 723 { 724 NetClientState *nc = opaque; 725 int ret; 726 727 728 if (nc->link_down) { 729 return iov_size(iov, iovcnt); 730 } 731 732 if (nc->receive_disabled) { 733 return 0; 734 } 735 736 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 737 ret = nc->info->receive_iov(nc, iov, iovcnt); 738 } else { 739 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 740 } 741 742 if (ret == 0) { 743 nc->receive_disabled = 1; 744 } 745 746 return ret; 747 } 748 749 ssize_t qemu_sendv_packet_async(NetClientState *sender, 750 const struct iovec *iov, int iovcnt, 751 NetPacketSent *sent_cb) 752 { 753 NetQueue *queue; 754 size_t size = iov_size(iov, iovcnt); 755 int ret; 756 757 if (size > NET_BUFSIZE) { 758 return size; 759 } 760 761 if (sender->link_down || !sender->peer) { 762 return size; 763 } 764 765 /* Let filters handle the packet first */ 766 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 767 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 768 if (ret) { 769 return ret; 770 } 771 772 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 773 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 774 if (ret) { 775 return ret; 776 } 777 778 queue = sender->peer->incoming_queue; 779 780 return qemu_net_queue_send_iov(queue, sender, 781 QEMU_NET_PACKET_FLAG_NONE, 782 iov, iovcnt, sent_cb); 783 } 784 785 ssize_t 786 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 787 { 788 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 789 } 790 791 NetClientState *qemu_find_netdev(const char *id) 792 { 793 NetClientState *nc; 794 795 QTAILQ_FOREACH(nc, &net_clients, next) { 796 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 797 continue; 798 if (!strcmp(nc->name, id)) { 799 return nc; 800 } 801 } 802 803 return NULL; 804 } 805 806 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 807 NetClientDriver type, int max) 808 { 809 NetClientState *nc; 810 int ret = 0; 811 812 QTAILQ_FOREACH(nc, &net_clients, next) { 813 if (nc->info->type == type) { 814 continue; 815 } 816 if (!id || !strcmp(nc->name, id)) { 817 if (ret < max) { 818 ncs[ret] = nc; 819 } 820 ret++; 821 } 822 } 823 824 return ret; 825 } 826 827 static int nic_get_free_idx(void) 828 { 829 int index; 830 831 for (index = 0; index < MAX_NICS; index++) 832 if (!nd_table[index].used) 833 return index; 834 return -1; 835 } 836 837 int qemu_show_nic_models(const char *arg, const char *const *models) 838 { 839 int i; 840 841 if (!arg || !is_help_option(arg)) { 842 return 0; 843 } 844 845 printf("Supported NIC models:\n"); 846 for (i = 0 ; models[i]; i++) { 847 printf("%s\n", models[i]); 848 } 849 return 1; 850 } 851 852 void qemu_check_nic_model(NICInfo *nd, const char *model) 853 { 854 const char *models[2]; 855 856 models[0] = model; 857 models[1] = NULL; 858 859 if (qemu_show_nic_models(nd->model, models)) 860 exit(0); 861 if (qemu_find_nic_model(nd, models, model) < 0) 862 exit(1); 863 } 864 865 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 866 const char *default_model) 867 { 868 int i; 869 870 if (!nd->model) 871 nd->model = g_strdup(default_model); 872 873 for (i = 0 ; models[i]; i++) { 874 if (strcmp(nd->model, models[i]) == 0) 875 return i; 876 } 877 878 error_report("Unsupported NIC model: %s", nd->model); 879 return -1; 880 } 881 882 static int net_init_nic(const Netdev *netdev, const char *name, 883 NetClientState *peer, Error **errp) 884 { 885 int idx; 886 NICInfo *nd; 887 const NetLegacyNicOptions *nic; 888 889 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 890 nic = &netdev->u.nic; 891 892 idx = nic_get_free_idx(); 893 if (idx == -1 || nb_nics >= MAX_NICS) { 894 error_setg(errp, "too many NICs"); 895 return -1; 896 } 897 898 nd = &nd_table[idx]; 899 900 memset(nd, 0, sizeof(*nd)); 901 902 if (nic->has_netdev) { 903 nd->netdev = qemu_find_netdev(nic->netdev); 904 if (!nd->netdev) { 905 error_setg(errp, "netdev '%s' not found", nic->netdev); 906 return -1; 907 } 908 } else { 909 assert(peer); 910 nd->netdev = peer; 911 } 912 nd->name = g_strdup(name); 913 if (nic->has_model) { 914 nd->model = g_strdup(nic->model); 915 } 916 if (nic->has_addr) { 917 nd->devaddr = g_strdup(nic->addr); 918 } 919 920 if (nic->has_macaddr && 921 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 922 error_setg(errp, "invalid syntax for ethernet address"); 923 return -1; 924 } 925 if (nic->has_macaddr && 926 is_multicast_ether_addr(nd->macaddr.a)) { 927 error_setg(errp, 928 "NIC cannot have multicast MAC address (odd 1st byte)"); 929 return -1; 930 } 931 qemu_macaddr_default_if_unset(&nd->macaddr); 932 933 if (nic->has_vectors) { 934 if (nic->vectors > 0x7ffffff) { 935 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 936 return -1; 937 } 938 nd->nvectors = nic->vectors; 939 } else { 940 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 941 } 942 943 nd->used = 1; 944 nb_nics++; 945 946 return idx; 947 } 948 949 950 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 951 const Netdev *netdev, 952 const char *name, 953 NetClientState *peer, Error **errp) = { 954 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 955 #ifdef CONFIG_SLIRP 956 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 957 #endif 958 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 959 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 960 #ifdef CONFIG_VDE 961 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 962 #endif 963 #ifdef CONFIG_NETMAP 964 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 965 #endif 966 #ifdef CONFIG_NET_BRIDGE 967 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 968 #endif 969 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 970 #ifdef CONFIG_VHOST_NET_USER 971 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 972 #endif 973 #ifdef CONFIG_VHOST_NET_VDPA 974 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 975 #endif 976 #ifdef CONFIG_L2TPV3 977 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 978 #endif 979 }; 980 981 982 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 983 { 984 NetClientState *peer = NULL; 985 NetClientState *nc; 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 nc = qemu_find_netdev(netdev->id); 1014 if (nc) { 1015 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1016 return -1; 1017 } 1018 1019 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1020 /* FIXME drop when all init functions store an Error */ 1021 if (errp && !*errp) { 1022 error_setg(errp, "Device '%s' could not be initialized", 1023 NetClientDriver_str(netdev->type)); 1024 } 1025 return -1; 1026 } 1027 1028 if (is_netdev) { 1029 nc = qemu_find_netdev(netdev->id); 1030 assert(nc); 1031 nc->is_netdev = true; 1032 } 1033 1034 return 0; 1035 } 1036 1037 void show_netdevs(void) 1038 { 1039 int idx; 1040 const char *available_netdevs[] = { 1041 "socket", 1042 "hubport", 1043 "tap", 1044 #ifdef CONFIG_SLIRP 1045 "user", 1046 #endif 1047 #ifdef CONFIG_L2TPV3 1048 "l2tpv3", 1049 #endif 1050 #ifdef CONFIG_VDE 1051 "vde", 1052 #endif 1053 #ifdef CONFIG_NET_BRIDGE 1054 "bridge", 1055 #endif 1056 #ifdef CONFIG_NETMAP 1057 "netmap", 1058 #endif 1059 #ifdef CONFIG_POSIX 1060 "vhost-user", 1061 #endif 1062 #ifdef CONFIG_VHOST_VDPA 1063 "vhost-vdpa", 1064 #endif 1065 }; 1066 1067 qemu_printf("Available netdev backend types:\n"); 1068 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1069 qemu_printf("%s\n", available_netdevs[idx]); 1070 } 1071 } 1072 1073 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1074 { 1075 gchar **substrings = NULL; 1076 Netdev *object = NULL; 1077 int ret = -1; 1078 Visitor *v = opts_visitor_new(opts); 1079 1080 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1081 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1082 1083 if (ip6_net) { 1084 char *prefix_addr; 1085 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1086 1087 substrings = g_strsplit(ip6_net, "/", 2); 1088 if (!substrings || !substrings[0]) { 1089 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1090 "a valid IPv6 prefix"); 1091 goto out; 1092 } 1093 1094 prefix_addr = substrings[0]; 1095 1096 /* Handle user-specified prefix length. */ 1097 if (substrings[1] && 1098 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1099 { 1100 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1101 "ipv6-prefixlen", "a number"); 1102 goto out; 1103 } 1104 1105 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1106 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1107 &error_abort); 1108 qemu_opt_unset(opts, "ipv6-net"); 1109 } 1110 1111 /* Create an ID for -net if the user did not specify one */ 1112 if (!is_netdev && !qemu_opts_id(opts)) { 1113 static int idx; 1114 qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++)); 1115 } 1116 1117 if (visit_type_Netdev(v, NULL, &object, errp)) { 1118 ret = net_client_init1(object, is_netdev, errp); 1119 } 1120 1121 qapi_free_Netdev(object); 1122 1123 out: 1124 g_strfreev(substrings); 1125 visit_free(v); 1126 return ret; 1127 } 1128 1129 void netdev_add(QemuOpts *opts, Error **errp) 1130 { 1131 net_client_init(opts, true, errp); 1132 } 1133 1134 void qmp_netdev_add(Netdev *netdev, Error **errp) 1135 { 1136 net_client_init1(netdev, true, errp); 1137 } 1138 1139 void qmp_netdev_del(const char *id, Error **errp) 1140 { 1141 NetClientState *nc; 1142 QemuOpts *opts; 1143 1144 nc = qemu_find_netdev(id); 1145 if (!nc) { 1146 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1147 "Device '%s' not found", id); 1148 return; 1149 } 1150 1151 if (!nc->is_netdev) { 1152 error_setg(errp, "Device '%s' is not a netdev", id); 1153 return; 1154 } 1155 1156 qemu_del_net_client(nc); 1157 1158 /* 1159 * Wart: we need to delete the QemuOpts associated with netdevs 1160 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1161 * HMP netdev_add. 1162 */ 1163 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1164 if (opts) { 1165 qemu_opts_del(opts); 1166 } 1167 } 1168 1169 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1170 { 1171 char *str; 1172 ObjectProperty *prop; 1173 ObjectPropertyIterator iter; 1174 Visitor *v; 1175 1176 /* generate info str */ 1177 object_property_iter_init(&iter, OBJECT(nf)); 1178 while ((prop = object_property_iter_next(&iter))) { 1179 if (!strcmp(prop->name, "type")) { 1180 continue; 1181 } 1182 v = string_output_visitor_new(false, &str); 1183 object_property_get(OBJECT(nf), prop->name, v, NULL); 1184 visit_complete(v, &str); 1185 visit_free(v); 1186 monitor_printf(mon, ",%s=%s", prop->name, str); 1187 g_free(str); 1188 } 1189 monitor_printf(mon, "\n"); 1190 } 1191 1192 void print_net_client(Monitor *mon, NetClientState *nc) 1193 { 1194 NetFilterState *nf; 1195 1196 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1197 nc->queue_index, 1198 NetClientDriver_str(nc->info->type), 1199 nc->info_str); 1200 if (!QTAILQ_EMPTY(&nc->filters)) { 1201 monitor_printf(mon, "filters:\n"); 1202 } 1203 QTAILQ_FOREACH(nf, &nc->filters, next) { 1204 monitor_printf(mon, " - %s: type=%s", 1205 object_get_canonical_path_component(OBJECT(nf)), 1206 object_get_typename(OBJECT(nf))); 1207 netfilter_print_info(mon, nf); 1208 } 1209 } 1210 1211 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1212 Error **errp) 1213 { 1214 NetClientState *nc; 1215 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1216 1217 QTAILQ_FOREACH(nc, &net_clients, next) { 1218 RxFilterInfo *info; 1219 1220 if (has_name && strcmp(nc->name, name) != 0) { 1221 continue; 1222 } 1223 1224 /* only query rx-filter information of NIC */ 1225 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1226 if (has_name) { 1227 error_setg(errp, "net client(%s) isn't a NIC", name); 1228 assert(!filter_list); 1229 return NULL; 1230 } 1231 continue; 1232 } 1233 1234 /* only query information on queue 0 since the info is per nic, 1235 * not per queue 1236 */ 1237 if (nc->queue_index != 0) 1238 continue; 1239 1240 if (nc->info->query_rx_filter) { 1241 info = nc->info->query_rx_filter(nc); 1242 QAPI_LIST_APPEND(tail, info); 1243 } else if (has_name) { 1244 error_setg(errp, "net client(%s) doesn't support" 1245 " rx-filter querying", name); 1246 assert(!filter_list); 1247 return NULL; 1248 } 1249 1250 if (has_name) { 1251 break; 1252 } 1253 } 1254 1255 if (filter_list == NULL && has_name) { 1256 error_setg(errp, "invalid net client name: %s", name); 1257 } 1258 1259 return filter_list; 1260 } 1261 1262 void hmp_info_network(Monitor *mon, const QDict *qdict) 1263 { 1264 NetClientState *nc, *peer; 1265 NetClientDriver type; 1266 1267 net_hub_info(mon); 1268 1269 QTAILQ_FOREACH(nc, &net_clients, next) { 1270 peer = nc->peer; 1271 type = nc->info->type; 1272 1273 /* Skip if already printed in hub info */ 1274 if (net_hub_id_for_client(nc, NULL) == 0) { 1275 continue; 1276 } 1277 1278 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1279 print_net_client(mon, nc); 1280 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1281 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1282 monitor_printf(mon, " \\ "); 1283 print_net_client(mon, peer); 1284 } 1285 } 1286 } 1287 1288 void colo_notify_filters_event(int event, Error **errp) 1289 { 1290 NetClientState *nc; 1291 NetFilterState *nf; 1292 NetFilterClass *nfc = NULL; 1293 Error *local_err = NULL; 1294 1295 QTAILQ_FOREACH(nc, &net_clients, next) { 1296 QTAILQ_FOREACH(nf, &nc->filters, next) { 1297 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1298 nfc->handle_event(nf, event, &local_err); 1299 if (local_err) { 1300 error_propagate(errp, local_err); 1301 return; 1302 } 1303 } 1304 } 1305 } 1306 1307 void qmp_set_link(const char *name, bool up, Error **errp) 1308 { 1309 NetClientState *ncs[MAX_QUEUE_NUM]; 1310 NetClientState *nc; 1311 int queues, i; 1312 1313 queues = qemu_find_net_clients_except(name, ncs, 1314 NET_CLIENT_DRIVER__MAX, 1315 MAX_QUEUE_NUM); 1316 1317 if (queues == 0) { 1318 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1319 "Device '%s' not found", name); 1320 return; 1321 } 1322 nc = ncs[0]; 1323 1324 for (i = 0; i < queues; i++) { 1325 ncs[i]->link_down = !up; 1326 } 1327 1328 if (nc->info->link_status_changed) { 1329 nc->info->link_status_changed(nc); 1330 } 1331 1332 if (nc->peer) { 1333 /* Change peer link only if the peer is NIC and then notify peer. 1334 * If the peer is a HUBPORT or a backend, we do not change the 1335 * link status. 1336 * 1337 * This behavior is compatible with qemu hubs where there could be 1338 * multiple clients that can still communicate with each other in 1339 * disconnected mode. For now maintain this compatibility. 1340 */ 1341 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1342 for (i = 0; i < queues; i++) { 1343 ncs[i]->peer->link_down = !up; 1344 } 1345 } 1346 if (nc->peer->info->link_status_changed) { 1347 nc->peer->info->link_status_changed(nc->peer); 1348 } 1349 } 1350 } 1351 1352 static void net_vm_change_state_handler(void *opaque, int running, 1353 RunState state) 1354 { 1355 NetClientState *nc; 1356 NetClientState *tmp; 1357 1358 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1359 if (running) { 1360 /* Flush queued packets and wake up backends. */ 1361 if (nc->peer && qemu_can_send_packet(nc)) { 1362 qemu_flush_queued_packets(nc->peer); 1363 } 1364 } else { 1365 /* Complete all queued packets, to guarantee we don't modify 1366 * state later when VM is not running. 1367 */ 1368 qemu_flush_or_purge_queued_packets(nc, true); 1369 } 1370 } 1371 } 1372 1373 void net_cleanup(void) 1374 { 1375 NetClientState *nc; 1376 1377 /* We may del multiple entries during qemu_del_net_client(), 1378 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1379 */ 1380 while (!QTAILQ_EMPTY(&net_clients)) { 1381 nc = QTAILQ_FIRST(&net_clients); 1382 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1383 qemu_del_nic(qemu_get_nic(nc)); 1384 } else { 1385 qemu_del_net_client(nc); 1386 } 1387 } 1388 1389 qemu_del_vm_change_state_handler(net_change_state_entry); 1390 } 1391 1392 void net_check_clients(void) 1393 { 1394 NetClientState *nc; 1395 int i; 1396 1397 net_hub_check_clients(); 1398 1399 QTAILQ_FOREACH(nc, &net_clients, next) { 1400 if (!nc->peer) { 1401 warn_report("%s %s has no peer", 1402 nc->info->type == NET_CLIENT_DRIVER_NIC 1403 ? "nic" : "netdev", 1404 nc->name); 1405 } 1406 } 1407 1408 /* Check that all NICs requested via -net nic actually got created. 1409 * NICs created via -device don't need to be checked here because 1410 * they are always instantiated. 1411 */ 1412 for (i = 0; i < MAX_NICS; i++) { 1413 NICInfo *nd = &nd_table[i]; 1414 if (nd->used && !nd->instantiated) { 1415 warn_report("requested NIC (%s, model %s) " 1416 "was not created (not supported by this machine?)", 1417 nd->name ? nd->name : "anonymous", 1418 nd->model ? nd->model : "unspecified"); 1419 } 1420 } 1421 } 1422 1423 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1424 { 1425 return net_client_init(opts, false, errp); 1426 } 1427 1428 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1429 { 1430 const char *type = qemu_opt_get(opts, "type"); 1431 1432 if (type && is_help_option(type)) { 1433 show_netdevs(); 1434 exit(0); 1435 } 1436 return net_client_init(opts, true, errp); 1437 } 1438 1439 /* For the convenience "--nic" parameter */ 1440 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1441 { 1442 char *mac, *nd_id; 1443 int idx, ret; 1444 NICInfo *ni; 1445 const char *type; 1446 1447 type = qemu_opt_get(opts, "type"); 1448 if (type && g_str_equal(type, "none")) { 1449 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1450 } 1451 1452 idx = nic_get_free_idx(); 1453 if (idx == -1 || nb_nics >= MAX_NICS) { 1454 error_setg(errp, "no more on-board/default NIC slots available"); 1455 return -1; 1456 } 1457 1458 if (!type) { 1459 qemu_opt_set(opts, "type", "user", &error_abort); 1460 } 1461 1462 ni = &nd_table[idx]; 1463 memset(ni, 0, sizeof(*ni)); 1464 ni->model = qemu_opt_get_del(opts, "model"); 1465 1466 /* Create an ID if the user did not specify one */ 1467 nd_id = g_strdup(qemu_opts_id(opts)); 1468 if (!nd_id) { 1469 nd_id = g_strdup_printf("__org.qemu.nic%i", idx); 1470 qemu_opts_set_id(opts, nd_id); 1471 } 1472 1473 /* Handle MAC address */ 1474 mac = qemu_opt_get_del(opts, "mac"); 1475 if (mac) { 1476 ret = net_parse_macaddr(ni->macaddr.a, mac); 1477 g_free(mac); 1478 if (ret) { 1479 error_setg(errp, "invalid syntax for ethernet address"); 1480 goto out; 1481 } 1482 if (is_multicast_ether_addr(ni->macaddr.a)) { 1483 error_setg(errp, "NIC cannot have multicast MAC address"); 1484 ret = -1; 1485 goto out; 1486 } 1487 } 1488 qemu_macaddr_default_if_unset(&ni->macaddr); 1489 1490 ret = net_client_init(opts, true, errp); 1491 if (ret == 0) { 1492 ni->netdev = qemu_find_netdev(nd_id); 1493 ni->used = true; 1494 nb_nics++; 1495 } 1496 1497 out: 1498 g_free(nd_id); 1499 return ret; 1500 } 1501 1502 int net_init_clients(Error **errp) 1503 { 1504 net_change_state_entry = 1505 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1506 1507 QTAILQ_INIT(&net_clients); 1508 1509 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1510 net_init_netdev, NULL, errp)) { 1511 return -1; 1512 } 1513 1514 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1515 return -1; 1516 } 1517 1518 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1519 return -1; 1520 } 1521 1522 return 0; 1523 } 1524 1525 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1526 { 1527 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1528 return -1; 1529 } 1530 1531 return 0; 1532 } 1533 1534 /* From FreeBSD */ 1535 /* XXX: optimize */ 1536 uint32_t net_crc32(const uint8_t *p, int len) 1537 { 1538 uint32_t crc; 1539 int carry, i, j; 1540 uint8_t b; 1541 1542 crc = 0xffffffff; 1543 for (i = 0; i < len; i++) { 1544 b = *p++; 1545 for (j = 0; j < 8; j++) { 1546 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1547 crc <<= 1; 1548 b >>= 1; 1549 if (carry) { 1550 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1551 } 1552 } 1553 } 1554 1555 return crc; 1556 } 1557 1558 uint32_t net_crc32_le(const uint8_t *p, int len) 1559 { 1560 uint32_t crc; 1561 int carry, i, j; 1562 uint8_t b; 1563 1564 crc = 0xffffffff; 1565 for (i = 0; i < len; i++) { 1566 b = *p++; 1567 for (j = 0; j < 8; j++) { 1568 carry = (crc & 0x1) ^ (b & 0x01); 1569 crc >>= 1; 1570 b >>= 1; 1571 if (carry) { 1572 crc ^= POLYNOMIAL_LE; 1573 } 1574 } 1575 } 1576 1577 return crc; 1578 } 1579 1580 QemuOptsList qemu_netdev_opts = { 1581 .name = "netdev", 1582 .implied_opt_name = "type", 1583 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1584 .desc = { 1585 /* 1586 * no elements => accept any params 1587 * validation will happen later 1588 */ 1589 { /* end of list */ } 1590 }, 1591 }; 1592 1593 QemuOptsList qemu_nic_opts = { 1594 .name = "nic", 1595 .implied_opt_name = "type", 1596 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1597 .desc = { 1598 /* 1599 * no elements => accept any params 1600 * validation will happen later 1601 */ 1602 { /* end of list */ } 1603 }, 1604 }; 1605 1606 QemuOptsList qemu_net_opts = { 1607 .name = "net", 1608 .implied_opt_name = "type", 1609 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1610 .desc = { 1611 /* 1612 * no elements => accept any params 1613 * validation will happen later 1614 */ 1615 { /* end of list */ } 1616 }, 1617 }; 1618 1619 void net_socket_rs_init(SocketReadState *rs, 1620 SocketReadStateFinalize *finalize, 1621 bool vnet_hdr) 1622 { 1623 rs->state = 0; 1624 rs->vnet_hdr = vnet_hdr; 1625 rs->index = 0; 1626 rs->packet_len = 0; 1627 rs->vnet_hdr_len = 0; 1628 memset(rs->buf, 0, sizeof(rs->buf)); 1629 rs->finalize = finalize; 1630 } 1631 1632 /* 1633 * Returns 1634 * 0: success 1635 * -1: error occurs 1636 */ 1637 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1638 { 1639 unsigned int l; 1640 1641 while (size > 0) { 1642 /* Reassemble a packet from the network. 1643 * 0 = getting length. 1644 * 1 = getting vnet header length. 1645 * 2 = getting data. 1646 */ 1647 switch (rs->state) { 1648 case 0: 1649 l = 4 - rs->index; 1650 if (l > size) { 1651 l = size; 1652 } 1653 memcpy(rs->buf + rs->index, buf, l); 1654 buf += l; 1655 size -= l; 1656 rs->index += l; 1657 if (rs->index == 4) { 1658 /* got length */ 1659 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1660 rs->index = 0; 1661 if (rs->vnet_hdr) { 1662 rs->state = 1; 1663 } else { 1664 rs->state = 2; 1665 rs->vnet_hdr_len = 0; 1666 } 1667 } 1668 break; 1669 case 1: 1670 l = 4 - rs->index; 1671 if (l > size) { 1672 l = size; 1673 } 1674 memcpy(rs->buf + rs->index, buf, l); 1675 buf += l; 1676 size -= l; 1677 rs->index += l; 1678 if (rs->index == 4) { 1679 /* got vnet header length */ 1680 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1681 rs->index = 0; 1682 rs->state = 2; 1683 } 1684 break; 1685 case 2: 1686 l = rs->packet_len - rs->index; 1687 if (l > size) { 1688 l = size; 1689 } 1690 if (rs->index + l <= sizeof(rs->buf)) { 1691 memcpy(rs->buf + rs->index, buf, l); 1692 } else { 1693 fprintf(stderr, "serious error: oversized packet received," 1694 "connection terminated.\n"); 1695 rs->index = rs->state = 0; 1696 return -1; 1697 } 1698 1699 rs->index += l; 1700 buf += l; 1701 size -= l; 1702 if (rs->index >= rs->packet_len) { 1703 rs->index = 0; 1704 rs->state = 0; 1705 assert(rs->finalize); 1706 rs->finalize(rs); 1707 } 1708 break; 1709 } 1710 } 1711 1712 assert(size == 0); 1713 return 0; 1714 } 1715