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/id.h" 47 #include "qemu/iov.h" 48 #include "qemu/qemu-print.h" 49 #include "qemu/main-loop.h" 50 #include "qemu/option.h" 51 #include "qapi/error.h" 52 #include "qapi/opts-visitor.h" 53 #include "sysemu/sysemu.h" 54 #include "sysemu/qtest.h" 55 #include "sysemu/runstate.h" 56 #include "sysemu/sysemu.h" 57 #include "net/filter.h" 58 #include "qapi/string-output-visitor.h" 59 60 /* Net bridge is currently not supported for W32. */ 61 #if !defined(_WIN32) 62 # define CONFIG_NET_BRIDGE 63 #endif 64 65 static VMChangeStateEntry *net_change_state_entry; 66 static QTAILQ_HEAD(, NetClientState) net_clients; 67 68 /***********************************************************/ 69 /* network device redirectors */ 70 71 int parse_host_port(struct sockaddr_in *saddr, const char *str, 72 Error **errp) 73 { 74 gchar **substrings; 75 struct hostent *he; 76 const char *addr, *p, *r; 77 int port, ret = 0; 78 79 substrings = g_strsplit(str, ":", 2); 80 if (!substrings || !substrings[0] || !substrings[1]) { 81 error_setg(errp, "host address '%s' doesn't contain ':' " 82 "separating host from port", str); 83 ret = -1; 84 goto out; 85 } 86 87 addr = substrings[0]; 88 p = substrings[1]; 89 90 saddr->sin_family = AF_INET; 91 if (addr[0] == '\0') { 92 saddr->sin_addr.s_addr = 0; 93 } else { 94 if (qemu_isdigit(addr[0])) { 95 if (!inet_aton(addr, &saddr->sin_addr)) { 96 error_setg(errp, "host address '%s' is not a valid " 97 "IPv4 address", addr); 98 ret = -1; 99 goto out; 100 } 101 } else { 102 he = gethostbyname(addr); 103 if (he == NULL) { 104 error_setg(errp, "can't resolve host address '%s'", addr); 105 ret = -1; 106 goto out; 107 } 108 saddr->sin_addr = *(struct in_addr *)he->h_addr; 109 } 110 } 111 port = strtol(p, (char **)&r, 0); 112 if (r == p) { 113 error_setg(errp, "port number '%s' is invalid", p); 114 ret = -1; 115 goto out; 116 } 117 saddr->sin_port = htons(port); 118 119 out: 120 g_strfreev(substrings); 121 return ret; 122 } 123 124 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 125 { 126 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 127 macaddr[0], macaddr[1], macaddr[2], 128 macaddr[3], macaddr[4], macaddr[5]); 129 } 130 131 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 132 { 133 snprintf(nc->info_str, sizeof(nc->info_str), 134 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 135 nc->model, 136 macaddr[0], macaddr[1], macaddr[2], 137 macaddr[3], macaddr[4], macaddr[5]); 138 } 139 140 static int mac_table[256] = {0}; 141 142 static void qemu_macaddr_set_used(MACAddr *macaddr) 143 { 144 int index; 145 146 for (index = 0x56; index < 0xFF; index++) { 147 if (macaddr->a[5] == index) { 148 mac_table[index]++; 149 } 150 } 151 } 152 153 static void qemu_macaddr_set_free(MACAddr *macaddr) 154 { 155 int index; 156 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 157 158 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 159 return; 160 } 161 for (index = 0x56; index < 0xFF; index++) { 162 if (macaddr->a[5] == index) { 163 mac_table[index]--; 164 } 165 } 166 } 167 168 static int qemu_macaddr_get_free(void) 169 { 170 int index; 171 172 for (index = 0x56; index < 0xFF; index++) { 173 if (mac_table[index] == 0) { 174 return index; 175 } 176 } 177 178 return -1; 179 } 180 181 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 182 { 183 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 184 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 185 186 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 187 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 188 return; 189 } else { 190 qemu_macaddr_set_used(macaddr); 191 return; 192 } 193 } 194 195 macaddr->a[0] = 0x52; 196 macaddr->a[1] = 0x54; 197 macaddr->a[2] = 0x00; 198 macaddr->a[3] = 0x12; 199 macaddr->a[4] = 0x34; 200 macaddr->a[5] = qemu_macaddr_get_free(); 201 qemu_macaddr_set_used(macaddr); 202 } 203 204 /** 205 * Generate a name for net client 206 * 207 * Only net clients created with the legacy -net option and NICs need this. 208 */ 209 static char *assign_name(NetClientState *nc1, const char *model) 210 { 211 NetClientState *nc; 212 int id = 0; 213 214 QTAILQ_FOREACH(nc, &net_clients, next) { 215 if (nc == nc1) { 216 continue; 217 } 218 if (strcmp(nc->model, model) == 0) { 219 id++; 220 } 221 } 222 223 return g_strdup_printf("%s.%d", model, id); 224 } 225 226 static void qemu_net_client_destructor(NetClientState *nc) 227 { 228 g_free(nc); 229 } 230 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 231 unsigned flags, 232 const struct iovec *iov, 233 int iovcnt, 234 void *opaque); 235 236 static void qemu_net_client_setup(NetClientState *nc, 237 NetClientInfo *info, 238 NetClientState *peer, 239 const char *model, 240 const char *name, 241 NetClientDestructor *destructor) 242 { 243 nc->info = info; 244 nc->model = g_strdup(model); 245 if (name) { 246 nc->name = g_strdup(name); 247 } else { 248 nc->name = assign_name(nc, model); 249 } 250 251 if (peer) { 252 assert(!peer->peer); 253 nc->peer = peer; 254 peer->peer = nc; 255 } 256 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 257 258 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 259 nc->destructor = destructor; 260 QTAILQ_INIT(&nc->filters); 261 } 262 263 NetClientState *qemu_new_net_client(NetClientInfo *info, 264 NetClientState *peer, 265 const char *model, 266 const char *name) 267 { 268 NetClientState *nc; 269 270 assert(info->size >= sizeof(NetClientState)); 271 272 nc = g_malloc0(info->size); 273 qemu_net_client_setup(nc, info, peer, model, name, 274 qemu_net_client_destructor); 275 276 return nc; 277 } 278 279 NICState *qemu_new_nic(NetClientInfo *info, 280 NICConf *conf, 281 const char *model, 282 const char *name, 283 void *opaque) 284 { 285 NetClientState **peers = conf->peers.ncs; 286 NICState *nic; 287 int i, queues = MAX(1, conf->peers.queues); 288 289 assert(info->type == NET_CLIENT_DRIVER_NIC); 290 assert(info->size >= sizeof(NICState)); 291 292 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 293 nic->ncs = (void *)nic + info->size; 294 nic->conf = conf; 295 nic->opaque = opaque; 296 297 for (i = 0; i < queues; i++) { 298 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 299 NULL); 300 nic->ncs[i].queue_index = i; 301 } 302 303 return nic; 304 } 305 306 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 307 { 308 return nic->ncs + queue_index; 309 } 310 311 NetClientState *qemu_get_queue(NICState *nic) 312 { 313 return qemu_get_subqueue(nic, 0); 314 } 315 316 NICState *qemu_get_nic(NetClientState *nc) 317 { 318 NetClientState *nc0 = nc - nc->queue_index; 319 320 return (NICState *)((void *)nc0 - nc->info->size); 321 } 322 323 void *qemu_get_nic_opaque(NetClientState *nc) 324 { 325 NICState *nic = qemu_get_nic(nc); 326 327 return nic->opaque; 328 } 329 330 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 331 { 332 assert(nc != NULL); 333 NetClientState *ncs = nc + queue_index; 334 return ncs->peer; 335 } 336 337 static void qemu_cleanup_net_client(NetClientState *nc) 338 { 339 QTAILQ_REMOVE(&net_clients, nc, next); 340 341 if (nc->info->cleanup) { 342 nc->info->cleanup(nc); 343 } 344 } 345 346 static void qemu_free_net_client(NetClientState *nc) 347 { 348 if (nc->incoming_queue) { 349 qemu_del_net_queue(nc->incoming_queue); 350 } 351 if (nc->peer) { 352 nc->peer->peer = NULL; 353 } 354 g_free(nc->name); 355 g_free(nc->model); 356 if (nc->destructor) { 357 nc->destructor(nc); 358 } 359 } 360 361 void qemu_del_net_client(NetClientState *nc) 362 { 363 NetClientState *ncs[MAX_QUEUE_NUM]; 364 int queues, i; 365 NetFilterState *nf, *next; 366 367 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 368 369 /* If the NetClientState belongs to a multiqueue backend, we will change all 370 * other NetClientStates also. 371 */ 372 queues = qemu_find_net_clients_except(nc->name, ncs, 373 NET_CLIENT_DRIVER_NIC, 374 MAX_QUEUE_NUM); 375 assert(queues != 0); 376 377 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 378 object_unparent(OBJECT(nf)); 379 } 380 381 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 382 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 383 NICState *nic = qemu_get_nic(nc->peer); 384 if (nic->peer_deleted) { 385 return; 386 } 387 nic->peer_deleted = true; 388 389 for (i = 0; i < queues; i++) { 390 ncs[i]->peer->link_down = true; 391 } 392 393 if (nc->peer->info->link_status_changed) { 394 nc->peer->info->link_status_changed(nc->peer); 395 } 396 397 for (i = 0; i < queues; i++) { 398 qemu_cleanup_net_client(ncs[i]); 399 } 400 401 return; 402 } 403 404 for (i = 0; i < queues; i++) { 405 qemu_cleanup_net_client(ncs[i]); 406 qemu_free_net_client(ncs[i]); 407 } 408 } 409 410 void qemu_del_nic(NICState *nic) 411 { 412 int i, queues = MAX(nic->conf->peers.queues, 1); 413 414 qemu_macaddr_set_free(&nic->conf->macaddr); 415 416 for (i = 0; i < queues; i++) { 417 NetClientState *nc = qemu_get_subqueue(nic, i); 418 /* If this is a peer NIC and peer has already been deleted, free it now. */ 419 if (nic->peer_deleted) { 420 qemu_free_net_client(nc->peer); 421 } else if (nc->peer) { 422 /* if there are RX packets pending, complete them */ 423 qemu_purge_queued_packets(nc->peer); 424 } 425 } 426 427 for (i = queues - 1; i >= 0; i--) { 428 NetClientState *nc = qemu_get_subqueue(nic, i); 429 430 qemu_cleanup_net_client(nc); 431 qemu_free_net_client(nc); 432 } 433 434 g_free(nic); 435 } 436 437 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 438 { 439 NetClientState *nc; 440 441 QTAILQ_FOREACH(nc, &net_clients, next) { 442 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 443 if (nc->queue_index == 0) { 444 func(qemu_get_nic(nc), opaque); 445 } 446 } 447 } 448 } 449 450 bool qemu_has_ufo(NetClientState *nc) 451 { 452 if (!nc || !nc->info->has_ufo) { 453 return false; 454 } 455 456 return nc->info->has_ufo(nc); 457 } 458 459 bool qemu_has_vnet_hdr(NetClientState *nc) 460 { 461 if (!nc || !nc->info->has_vnet_hdr) { 462 return false; 463 } 464 465 return nc->info->has_vnet_hdr(nc); 466 } 467 468 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 469 { 470 if (!nc || !nc->info->has_vnet_hdr_len) { 471 return false; 472 } 473 474 return nc->info->has_vnet_hdr_len(nc, len); 475 } 476 477 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 478 { 479 if (!nc || !nc->info->using_vnet_hdr) { 480 return; 481 } 482 483 nc->info->using_vnet_hdr(nc, enable); 484 } 485 486 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 487 int ecn, int ufo) 488 { 489 if (!nc || !nc->info->set_offload) { 490 return; 491 } 492 493 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 494 } 495 496 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 497 { 498 if (!nc || !nc->info->set_vnet_hdr_len) { 499 return; 500 } 501 502 nc->vnet_hdr_len = len; 503 nc->info->set_vnet_hdr_len(nc, len); 504 } 505 506 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 507 { 508 #ifdef HOST_WORDS_BIGENDIAN 509 if (!nc || !nc->info->set_vnet_le) { 510 return -ENOSYS; 511 } 512 513 return nc->info->set_vnet_le(nc, is_le); 514 #else 515 return 0; 516 #endif 517 } 518 519 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 520 { 521 #ifdef HOST_WORDS_BIGENDIAN 522 return 0; 523 #else 524 if (!nc || !nc->info->set_vnet_be) { 525 return -ENOSYS; 526 } 527 528 return nc->info->set_vnet_be(nc, is_be); 529 #endif 530 } 531 532 int qemu_can_send_packet(NetClientState *sender) 533 { 534 int vm_running = runstate_is_running(); 535 536 if (!vm_running) { 537 return 0; 538 } 539 540 if (!sender->peer) { 541 return 1; 542 } 543 544 if (sender->peer->receive_disabled) { 545 return 0; 546 } else if (sender->peer->info->can_receive && 547 !sender->peer->info->can_receive(sender->peer)) { 548 return 0; 549 } 550 return 1; 551 } 552 553 static ssize_t filter_receive_iov(NetClientState *nc, 554 NetFilterDirection direction, 555 NetClientState *sender, 556 unsigned flags, 557 const struct iovec *iov, 558 int iovcnt, 559 NetPacketSent *sent_cb) 560 { 561 ssize_t ret = 0; 562 NetFilterState *nf = NULL; 563 564 if (direction == NET_FILTER_DIRECTION_TX) { 565 QTAILQ_FOREACH(nf, &nc->filters, next) { 566 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 567 iovcnt, sent_cb); 568 if (ret) { 569 return ret; 570 } 571 } 572 } else { 573 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 574 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 575 iovcnt, sent_cb); 576 if (ret) { 577 return ret; 578 } 579 } 580 } 581 582 return ret; 583 } 584 585 static ssize_t filter_receive(NetClientState *nc, 586 NetFilterDirection direction, 587 NetClientState *sender, 588 unsigned flags, 589 const uint8_t *data, 590 size_t size, 591 NetPacketSent *sent_cb) 592 { 593 struct iovec iov = { 594 .iov_base = (void *)data, 595 .iov_len = size 596 }; 597 598 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 599 } 600 601 void qemu_purge_queued_packets(NetClientState *nc) 602 { 603 if (!nc->peer) { 604 return; 605 } 606 607 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 608 } 609 610 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 611 { 612 nc->receive_disabled = 0; 613 614 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 615 if (net_hub_flush(nc->peer)) { 616 qemu_notify_event(); 617 } 618 } 619 if (qemu_net_queue_flush(nc->incoming_queue)) { 620 /* We emptied the queue successfully, signal to the IO thread to repoll 621 * the file descriptor (for tap, for example). 622 */ 623 qemu_notify_event(); 624 } else if (purge) { 625 /* Unable to empty the queue, purge remaining packets */ 626 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 627 } 628 } 629 630 void qemu_flush_queued_packets(NetClientState *nc) 631 { 632 qemu_flush_or_purge_queued_packets(nc, false); 633 } 634 635 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 636 unsigned flags, 637 const uint8_t *buf, int size, 638 NetPacketSent *sent_cb) 639 { 640 NetQueue *queue; 641 int ret; 642 643 #ifdef DEBUG_NET 644 printf("qemu_send_packet_async:\n"); 645 qemu_hexdump(stdout, "net", buf, size); 646 #endif 647 648 if (sender->link_down || !sender->peer) { 649 return size; 650 } 651 652 /* Let filters handle the packet first */ 653 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 654 sender, flags, buf, size, sent_cb); 655 if (ret) { 656 return ret; 657 } 658 659 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 660 sender, flags, buf, size, sent_cb); 661 if (ret) { 662 return ret; 663 } 664 665 queue = sender->peer->incoming_queue; 666 667 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 668 } 669 670 ssize_t qemu_send_packet_async(NetClientState *sender, 671 const uint8_t *buf, int size, 672 NetPacketSent *sent_cb) 673 { 674 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 675 buf, size, sent_cb); 676 } 677 678 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 679 { 680 return qemu_send_packet_async(nc, buf, size, NULL); 681 } 682 683 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 684 { 685 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 686 buf, size, NULL); 687 } 688 689 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 690 int iovcnt, unsigned flags) 691 { 692 uint8_t *buf = NULL; 693 uint8_t *buffer; 694 size_t offset; 695 ssize_t ret; 696 697 if (iovcnt == 1) { 698 buffer = iov[0].iov_base; 699 offset = iov[0].iov_len; 700 } else { 701 offset = iov_size(iov, iovcnt); 702 if (offset > NET_BUFSIZE) { 703 return -1; 704 } 705 buf = g_malloc(offset); 706 buffer = buf; 707 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 708 } 709 710 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 711 ret = nc->info->receive_raw(nc, buffer, offset); 712 } else { 713 ret = nc->info->receive(nc, buffer, offset); 714 } 715 716 g_free(buf); 717 return ret; 718 } 719 720 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 721 unsigned flags, 722 const struct iovec *iov, 723 int iovcnt, 724 void *opaque) 725 { 726 NetClientState *nc = opaque; 727 int ret; 728 729 730 if (nc->link_down) { 731 return iov_size(iov, iovcnt); 732 } 733 734 if (nc->receive_disabled) { 735 return 0; 736 } 737 738 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 739 ret = nc->info->receive_iov(nc, iov, iovcnt); 740 } else { 741 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 742 } 743 744 if (ret == 0) { 745 nc->receive_disabled = 1; 746 } 747 748 return ret; 749 } 750 751 ssize_t qemu_sendv_packet_async(NetClientState *sender, 752 const struct iovec *iov, int iovcnt, 753 NetPacketSent *sent_cb) 754 { 755 NetQueue *queue; 756 size_t size = iov_size(iov, iovcnt); 757 int ret; 758 759 if (size > NET_BUFSIZE) { 760 return size; 761 } 762 763 if (sender->link_down || !sender->peer) { 764 return size; 765 } 766 767 /* Let filters handle the packet first */ 768 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 769 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 770 if (ret) { 771 return ret; 772 } 773 774 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 775 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 776 if (ret) { 777 return ret; 778 } 779 780 queue = sender->peer->incoming_queue; 781 782 return qemu_net_queue_send_iov(queue, sender, 783 QEMU_NET_PACKET_FLAG_NONE, 784 iov, iovcnt, sent_cb); 785 } 786 787 ssize_t 788 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 789 { 790 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 791 } 792 793 NetClientState *qemu_find_netdev(const char *id) 794 { 795 NetClientState *nc; 796 797 QTAILQ_FOREACH(nc, &net_clients, next) { 798 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 799 continue; 800 if (!strcmp(nc->name, id)) { 801 return nc; 802 } 803 } 804 805 return NULL; 806 } 807 808 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 809 NetClientDriver type, int max) 810 { 811 NetClientState *nc; 812 int ret = 0; 813 814 QTAILQ_FOREACH(nc, &net_clients, next) { 815 if (nc->info->type == type) { 816 continue; 817 } 818 if (!id || !strcmp(nc->name, id)) { 819 if (ret < max) { 820 ncs[ret] = nc; 821 } 822 ret++; 823 } 824 } 825 826 return ret; 827 } 828 829 static int nic_get_free_idx(void) 830 { 831 int index; 832 833 for (index = 0; index < MAX_NICS; index++) 834 if (!nd_table[index].used) 835 return index; 836 return -1; 837 } 838 839 int qemu_show_nic_models(const char *arg, const char *const *models) 840 { 841 int i; 842 843 if (!arg || !is_help_option(arg)) { 844 return 0; 845 } 846 847 printf("Supported NIC models:\n"); 848 for (i = 0 ; models[i]; i++) { 849 printf("%s\n", models[i]); 850 } 851 return 1; 852 } 853 854 void qemu_check_nic_model(NICInfo *nd, const char *model) 855 { 856 const char *models[2]; 857 858 models[0] = model; 859 models[1] = NULL; 860 861 if (qemu_show_nic_models(nd->model, models)) 862 exit(0); 863 if (qemu_find_nic_model(nd, models, model) < 0) 864 exit(1); 865 } 866 867 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 868 const char *default_model) 869 { 870 int i; 871 872 if (!nd->model) 873 nd->model = g_strdup(default_model); 874 875 for (i = 0 ; models[i]; i++) { 876 if (strcmp(nd->model, models[i]) == 0) 877 return i; 878 } 879 880 error_report("Unsupported NIC model: %s", nd->model); 881 return -1; 882 } 883 884 static int net_init_nic(const Netdev *netdev, const char *name, 885 NetClientState *peer, Error **errp) 886 { 887 int idx; 888 NICInfo *nd; 889 const NetLegacyNicOptions *nic; 890 891 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 892 nic = &netdev->u.nic; 893 894 idx = nic_get_free_idx(); 895 if (idx == -1 || nb_nics >= MAX_NICS) { 896 error_setg(errp, "too many NICs"); 897 return -1; 898 } 899 900 nd = &nd_table[idx]; 901 902 memset(nd, 0, sizeof(*nd)); 903 904 if (nic->has_netdev) { 905 nd->netdev = qemu_find_netdev(nic->netdev); 906 if (!nd->netdev) { 907 error_setg(errp, "netdev '%s' not found", nic->netdev); 908 return -1; 909 } 910 } else { 911 assert(peer); 912 nd->netdev = peer; 913 } 914 nd->name = g_strdup(name); 915 if (nic->has_model) { 916 nd->model = g_strdup(nic->model); 917 } 918 if (nic->has_addr) { 919 nd->devaddr = g_strdup(nic->addr); 920 } 921 922 if (nic->has_macaddr && 923 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 924 error_setg(errp, "invalid syntax for ethernet address"); 925 return -1; 926 } 927 if (nic->has_macaddr && 928 is_multicast_ether_addr(nd->macaddr.a)) { 929 error_setg(errp, 930 "NIC cannot have multicast MAC address (odd 1st byte)"); 931 return -1; 932 } 933 qemu_macaddr_default_if_unset(&nd->macaddr); 934 935 if (nic->has_vectors) { 936 if (nic->vectors > 0x7ffffff) { 937 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 938 return -1; 939 } 940 nd->nvectors = nic->vectors; 941 } else { 942 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 943 } 944 945 nd->used = 1; 946 nb_nics++; 947 948 return idx; 949 } 950 951 952 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 953 const Netdev *netdev, 954 const char *name, 955 NetClientState *peer, Error **errp) = { 956 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 957 #ifdef CONFIG_SLIRP 958 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 959 #endif 960 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 961 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 962 #ifdef CONFIG_VDE 963 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 964 #endif 965 #ifdef CONFIG_NETMAP 966 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 967 #endif 968 #ifdef CONFIG_NET_BRIDGE 969 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 970 #endif 971 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 972 #ifdef CONFIG_VHOST_NET_USER 973 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 974 #endif 975 #ifdef CONFIG_VHOST_NET_VDPA 976 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 977 #endif 978 #ifdef CONFIG_L2TPV3 979 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 980 #endif 981 }; 982 983 984 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 985 { 986 NetClientState *peer = NULL; 987 NetClientState *nc; 988 989 if (is_netdev) { 990 if (netdev->type == NET_CLIENT_DRIVER_NIC || 991 !net_client_init_fun[netdev->type]) { 992 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 993 "a netdev backend type"); 994 return -1; 995 } 996 } else { 997 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 998 return 0; /* nothing to do */ 999 } 1000 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 1001 !net_client_init_fun[netdev->type]) { 1002 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1003 "a net backend type (maybe it is not compiled " 1004 "into this binary)"); 1005 return -1; 1006 } 1007 1008 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1009 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1010 !netdev->u.nic.has_netdev) { 1011 peer = net_hub_add_port(0, NULL, NULL); 1012 } 1013 } 1014 1015 nc = qemu_find_netdev(netdev->id); 1016 if (nc) { 1017 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1018 return -1; 1019 } 1020 1021 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1022 /* FIXME drop when all init functions store an Error */ 1023 if (errp && !*errp) { 1024 error_setg(errp, "Device '%s' could not be initialized", 1025 NetClientDriver_str(netdev->type)); 1026 } 1027 return -1; 1028 } 1029 1030 if (is_netdev) { 1031 nc = qemu_find_netdev(netdev->id); 1032 assert(nc); 1033 nc->is_netdev = true; 1034 } 1035 1036 return 0; 1037 } 1038 1039 void show_netdevs(void) 1040 { 1041 int idx; 1042 const char *available_netdevs[] = { 1043 "socket", 1044 "hubport", 1045 "tap", 1046 #ifdef CONFIG_SLIRP 1047 "user", 1048 #endif 1049 #ifdef CONFIG_L2TPV3 1050 "l2tpv3", 1051 #endif 1052 #ifdef CONFIG_VDE 1053 "vde", 1054 #endif 1055 #ifdef CONFIG_NET_BRIDGE 1056 "bridge", 1057 #endif 1058 #ifdef CONFIG_NETMAP 1059 "netmap", 1060 #endif 1061 #ifdef CONFIG_POSIX 1062 "vhost-user", 1063 #endif 1064 #ifdef CONFIG_VHOST_VDPA 1065 "vhost-vdpa", 1066 #endif 1067 }; 1068 1069 qemu_printf("Available netdev backend types:\n"); 1070 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1071 qemu_printf("%s\n", available_netdevs[idx]); 1072 } 1073 } 1074 1075 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1076 { 1077 gchar **substrings = NULL; 1078 Netdev *object = NULL; 1079 int ret = -1; 1080 Visitor *v = opts_visitor_new(opts); 1081 1082 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1083 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1084 1085 if (ip6_net) { 1086 char *prefix_addr; 1087 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1088 1089 substrings = g_strsplit(ip6_net, "/", 2); 1090 if (!substrings || !substrings[0]) { 1091 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1092 "a valid IPv6 prefix"); 1093 goto out; 1094 } 1095 1096 prefix_addr = substrings[0]; 1097 1098 /* Handle user-specified prefix length. */ 1099 if (substrings[1] && 1100 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1101 { 1102 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1103 "ipv6-prefixlen", "a number"); 1104 goto out; 1105 } 1106 1107 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1108 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1109 &error_abort); 1110 qemu_opt_unset(opts, "ipv6-net"); 1111 } 1112 1113 /* Create an ID for -net if the user did not specify one */ 1114 if (!is_netdev && !qemu_opts_id(opts)) { 1115 qemu_opts_set_id(opts, id_generate(ID_NET)); 1116 } 1117 1118 if (visit_type_Netdev(v, NULL, &object, errp)) { 1119 ret = net_client_init1(object, is_netdev, errp); 1120 } 1121 1122 qapi_free_Netdev(object); 1123 1124 out: 1125 g_strfreev(substrings); 1126 visit_free(v); 1127 return ret; 1128 } 1129 1130 void netdev_add(QemuOpts *opts, Error **errp) 1131 { 1132 net_client_init(opts, true, errp); 1133 } 1134 1135 void qmp_netdev_add(Netdev *netdev, Error **errp) 1136 { 1137 net_client_init1(netdev, true, errp); 1138 } 1139 1140 void qmp_netdev_del(const char *id, Error **errp) 1141 { 1142 NetClientState *nc; 1143 QemuOpts *opts; 1144 1145 nc = qemu_find_netdev(id); 1146 if (!nc) { 1147 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1148 "Device '%s' not found", id); 1149 return; 1150 } 1151 1152 if (!nc->is_netdev) { 1153 error_setg(errp, "Device '%s' is not a netdev", id); 1154 return; 1155 } 1156 1157 qemu_del_net_client(nc); 1158 1159 /* 1160 * Wart: we need to delete the QemuOpts associated with netdevs 1161 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1162 * HMP netdev_add. 1163 */ 1164 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1165 if (opts) { 1166 qemu_opts_del(opts); 1167 } 1168 } 1169 1170 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1171 { 1172 char *str; 1173 ObjectProperty *prop; 1174 ObjectPropertyIterator iter; 1175 Visitor *v; 1176 1177 /* generate info str */ 1178 object_property_iter_init(&iter, OBJECT(nf)); 1179 while ((prop = object_property_iter_next(&iter))) { 1180 if (!strcmp(prop->name, "type")) { 1181 continue; 1182 } 1183 v = string_output_visitor_new(false, &str); 1184 object_property_get(OBJECT(nf), prop->name, v, NULL); 1185 visit_complete(v, &str); 1186 visit_free(v); 1187 monitor_printf(mon, ",%s=%s", prop->name, str); 1188 g_free(str); 1189 } 1190 monitor_printf(mon, "\n"); 1191 } 1192 1193 void print_net_client(Monitor *mon, NetClientState *nc) 1194 { 1195 NetFilterState *nf; 1196 1197 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1198 nc->queue_index, 1199 NetClientDriver_str(nc->info->type), 1200 nc->info_str); 1201 if (!QTAILQ_EMPTY(&nc->filters)) { 1202 monitor_printf(mon, "filters:\n"); 1203 } 1204 QTAILQ_FOREACH(nf, &nc->filters, next) { 1205 monitor_printf(mon, " - %s: type=%s", 1206 object_get_canonical_path_component(OBJECT(nf)), 1207 object_get_typename(OBJECT(nf))); 1208 netfilter_print_info(mon, nf); 1209 } 1210 } 1211 1212 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1213 Error **errp) 1214 { 1215 NetClientState *nc; 1216 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1217 1218 QTAILQ_FOREACH(nc, &net_clients, next) { 1219 RxFilterInfo *info; 1220 1221 if (has_name && strcmp(nc->name, name) != 0) { 1222 continue; 1223 } 1224 1225 /* only query rx-filter information of NIC */ 1226 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1227 if (has_name) { 1228 error_setg(errp, "net client(%s) isn't a NIC", name); 1229 assert(!filter_list); 1230 return NULL; 1231 } 1232 continue; 1233 } 1234 1235 /* only query information on queue 0 since the info is per nic, 1236 * not per queue 1237 */ 1238 if (nc->queue_index != 0) 1239 continue; 1240 1241 if (nc->info->query_rx_filter) { 1242 info = nc->info->query_rx_filter(nc); 1243 QAPI_LIST_APPEND(tail, info); 1244 } else if (has_name) { 1245 error_setg(errp, "net client(%s) doesn't support" 1246 " rx-filter querying", name); 1247 assert(!filter_list); 1248 return NULL; 1249 } 1250 1251 if (has_name) { 1252 break; 1253 } 1254 } 1255 1256 if (filter_list == NULL && has_name) { 1257 error_setg(errp, "invalid net client name: %s", name); 1258 } 1259 1260 return filter_list; 1261 } 1262 1263 void hmp_info_network(Monitor *mon, const QDict *qdict) 1264 { 1265 NetClientState *nc, *peer; 1266 NetClientDriver type; 1267 1268 net_hub_info(mon); 1269 1270 QTAILQ_FOREACH(nc, &net_clients, next) { 1271 peer = nc->peer; 1272 type = nc->info->type; 1273 1274 /* Skip if already printed in hub info */ 1275 if (net_hub_id_for_client(nc, NULL) == 0) { 1276 continue; 1277 } 1278 1279 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1280 print_net_client(mon, nc); 1281 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1282 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1283 monitor_printf(mon, " \\ "); 1284 print_net_client(mon, peer); 1285 } 1286 } 1287 } 1288 1289 void colo_notify_filters_event(int event, Error **errp) 1290 { 1291 NetClientState *nc; 1292 NetFilterState *nf; 1293 NetFilterClass *nfc = NULL; 1294 Error *local_err = NULL; 1295 1296 QTAILQ_FOREACH(nc, &net_clients, next) { 1297 QTAILQ_FOREACH(nf, &nc->filters, next) { 1298 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1299 nfc->handle_event(nf, event, &local_err); 1300 if (local_err) { 1301 error_propagate(errp, local_err); 1302 return; 1303 } 1304 } 1305 } 1306 } 1307 1308 void qmp_set_link(const char *name, bool up, Error **errp) 1309 { 1310 NetClientState *ncs[MAX_QUEUE_NUM]; 1311 NetClientState *nc; 1312 int queues, i; 1313 1314 queues = qemu_find_net_clients_except(name, ncs, 1315 NET_CLIENT_DRIVER__MAX, 1316 MAX_QUEUE_NUM); 1317 1318 if (queues == 0) { 1319 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1320 "Device '%s' not found", name); 1321 return; 1322 } 1323 nc = ncs[0]; 1324 1325 for (i = 0; i < queues; i++) { 1326 ncs[i]->link_down = !up; 1327 } 1328 1329 if (nc->info->link_status_changed) { 1330 nc->info->link_status_changed(nc); 1331 } 1332 1333 if (nc->peer) { 1334 /* Change peer link only if the peer is NIC and then notify peer. 1335 * If the peer is a HUBPORT or a backend, we do not change the 1336 * link status. 1337 * 1338 * This behavior is compatible with qemu hubs where there could be 1339 * multiple clients that can still communicate with each other in 1340 * disconnected mode. For now maintain this compatibility. 1341 */ 1342 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1343 for (i = 0; i < queues; i++) { 1344 ncs[i]->peer->link_down = !up; 1345 } 1346 } 1347 if (nc->peer->info->link_status_changed) { 1348 nc->peer->info->link_status_changed(nc->peer); 1349 } 1350 } 1351 } 1352 1353 static void net_vm_change_state_handler(void *opaque, int running, 1354 RunState state) 1355 { 1356 NetClientState *nc; 1357 NetClientState *tmp; 1358 1359 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1360 if (running) { 1361 /* Flush queued packets and wake up backends. */ 1362 if (nc->peer && qemu_can_send_packet(nc)) { 1363 qemu_flush_queued_packets(nc->peer); 1364 } 1365 } else { 1366 /* Complete all queued packets, to guarantee we don't modify 1367 * state later when VM is not running. 1368 */ 1369 qemu_flush_or_purge_queued_packets(nc, true); 1370 } 1371 } 1372 } 1373 1374 void net_cleanup(void) 1375 { 1376 NetClientState *nc; 1377 1378 /* We may del multiple entries during qemu_del_net_client(), 1379 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1380 */ 1381 while (!QTAILQ_EMPTY(&net_clients)) { 1382 nc = QTAILQ_FIRST(&net_clients); 1383 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1384 qemu_del_nic(qemu_get_nic(nc)); 1385 } else { 1386 qemu_del_net_client(nc); 1387 } 1388 } 1389 1390 qemu_del_vm_change_state_handler(net_change_state_entry); 1391 } 1392 1393 void net_check_clients(void) 1394 { 1395 NetClientState *nc; 1396 int i; 1397 1398 net_hub_check_clients(); 1399 1400 QTAILQ_FOREACH(nc, &net_clients, next) { 1401 if (!nc->peer) { 1402 warn_report("%s %s has no peer", 1403 nc->info->type == NET_CLIENT_DRIVER_NIC 1404 ? "nic" : "netdev", 1405 nc->name); 1406 } 1407 } 1408 1409 /* Check that all NICs requested via -net nic actually got created. 1410 * NICs created via -device don't need to be checked here because 1411 * they are always instantiated. 1412 */ 1413 for (i = 0; i < MAX_NICS; i++) { 1414 NICInfo *nd = &nd_table[i]; 1415 if (nd->used && !nd->instantiated) { 1416 warn_report("requested NIC (%s, model %s) " 1417 "was not created (not supported by this machine?)", 1418 nd->name ? nd->name : "anonymous", 1419 nd->model ? nd->model : "unspecified"); 1420 } 1421 } 1422 } 1423 1424 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1425 { 1426 return net_client_init(opts, false, errp); 1427 } 1428 1429 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1430 { 1431 const char *type = qemu_opt_get(opts, "type"); 1432 1433 if (type && is_help_option(type)) { 1434 show_netdevs(); 1435 exit(0); 1436 } 1437 return net_client_init(opts, true, errp); 1438 } 1439 1440 /* For the convenience "--nic" parameter */ 1441 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1442 { 1443 char *mac, *nd_id; 1444 int idx, ret; 1445 NICInfo *ni; 1446 const char *type; 1447 1448 type = qemu_opt_get(opts, "type"); 1449 if (type && g_str_equal(type, "none")) { 1450 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1451 } 1452 1453 idx = nic_get_free_idx(); 1454 if (idx == -1 || nb_nics >= MAX_NICS) { 1455 error_setg(errp, "no more on-board/default NIC slots available"); 1456 return -1; 1457 } 1458 1459 if (!type) { 1460 qemu_opt_set(opts, "type", "user", &error_abort); 1461 } 1462 1463 ni = &nd_table[idx]; 1464 memset(ni, 0, sizeof(*ni)); 1465 ni->model = qemu_opt_get_del(opts, "model"); 1466 1467 /* Create an ID if the user did not specify one */ 1468 nd_id = g_strdup(qemu_opts_id(opts)); 1469 if (!nd_id) { 1470 nd_id = id_generate(ID_NET); 1471 qemu_opts_set_id(opts, nd_id); 1472 } 1473 1474 /* Handle MAC address */ 1475 mac = qemu_opt_get_del(opts, "mac"); 1476 if (mac) { 1477 ret = net_parse_macaddr(ni->macaddr.a, mac); 1478 g_free(mac); 1479 if (ret) { 1480 error_setg(errp, "invalid syntax for ethernet address"); 1481 goto out; 1482 } 1483 if (is_multicast_ether_addr(ni->macaddr.a)) { 1484 error_setg(errp, "NIC cannot have multicast MAC address"); 1485 ret = -1; 1486 goto out; 1487 } 1488 } 1489 qemu_macaddr_default_if_unset(&ni->macaddr); 1490 1491 ret = net_client_init(opts, true, errp); 1492 if (ret == 0) { 1493 ni->netdev = qemu_find_netdev(nd_id); 1494 ni->used = true; 1495 nb_nics++; 1496 } 1497 1498 out: 1499 g_free(nd_id); 1500 return ret; 1501 } 1502 1503 int net_init_clients(Error **errp) 1504 { 1505 net_change_state_entry = 1506 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1507 1508 QTAILQ_INIT(&net_clients); 1509 1510 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1511 net_init_netdev, NULL, errp)) { 1512 return -1; 1513 } 1514 1515 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1516 return -1; 1517 } 1518 1519 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1520 return -1; 1521 } 1522 1523 return 0; 1524 } 1525 1526 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1527 { 1528 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1529 return -1; 1530 } 1531 1532 return 0; 1533 } 1534 1535 /* From FreeBSD */ 1536 /* XXX: optimize */ 1537 uint32_t net_crc32(const uint8_t *p, int len) 1538 { 1539 uint32_t crc; 1540 int carry, i, j; 1541 uint8_t b; 1542 1543 crc = 0xffffffff; 1544 for (i = 0; i < len; i++) { 1545 b = *p++; 1546 for (j = 0; j < 8; j++) { 1547 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1548 crc <<= 1; 1549 b >>= 1; 1550 if (carry) { 1551 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1552 } 1553 } 1554 } 1555 1556 return crc; 1557 } 1558 1559 uint32_t net_crc32_le(const uint8_t *p, int len) 1560 { 1561 uint32_t crc; 1562 int carry, i, j; 1563 uint8_t b; 1564 1565 crc = 0xffffffff; 1566 for (i = 0; i < len; i++) { 1567 b = *p++; 1568 for (j = 0; j < 8; j++) { 1569 carry = (crc & 0x1) ^ (b & 0x01); 1570 crc >>= 1; 1571 b >>= 1; 1572 if (carry) { 1573 crc ^= POLYNOMIAL_LE; 1574 } 1575 } 1576 } 1577 1578 return crc; 1579 } 1580 1581 QemuOptsList qemu_netdev_opts = { 1582 .name = "netdev", 1583 .implied_opt_name = "type", 1584 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1585 .desc = { 1586 /* 1587 * no elements => accept any params 1588 * validation will happen later 1589 */ 1590 { /* end of list */ } 1591 }, 1592 }; 1593 1594 QemuOptsList qemu_nic_opts = { 1595 .name = "nic", 1596 .implied_opt_name = "type", 1597 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1598 .desc = { 1599 /* 1600 * no elements => accept any params 1601 * validation will happen later 1602 */ 1603 { /* end of list */ } 1604 }, 1605 }; 1606 1607 QemuOptsList qemu_net_opts = { 1608 .name = "net", 1609 .implied_opt_name = "type", 1610 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1611 .desc = { 1612 /* 1613 * no elements => accept any params 1614 * validation will happen later 1615 */ 1616 { /* end of list */ } 1617 }, 1618 }; 1619 1620 void net_socket_rs_init(SocketReadState *rs, 1621 SocketReadStateFinalize *finalize, 1622 bool vnet_hdr) 1623 { 1624 rs->state = 0; 1625 rs->vnet_hdr = vnet_hdr; 1626 rs->index = 0; 1627 rs->packet_len = 0; 1628 rs->vnet_hdr_len = 0; 1629 memset(rs->buf, 0, sizeof(rs->buf)); 1630 rs->finalize = finalize; 1631 } 1632 1633 /* 1634 * Returns 1635 * 0: success 1636 * -1: error occurs 1637 */ 1638 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1639 { 1640 unsigned int l; 1641 1642 while (size > 0) { 1643 /* Reassemble a packet from the network. 1644 * 0 = getting length. 1645 * 1 = getting vnet header length. 1646 * 2 = getting data. 1647 */ 1648 switch (rs->state) { 1649 case 0: 1650 l = 4 - rs->index; 1651 if (l > size) { 1652 l = size; 1653 } 1654 memcpy(rs->buf + rs->index, buf, l); 1655 buf += l; 1656 size -= l; 1657 rs->index += l; 1658 if (rs->index == 4) { 1659 /* got length */ 1660 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1661 rs->index = 0; 1662 if (rs->vnet_hdr) { 1663 rs->state = 1; 1664 } else { 1665 rs->state = 2; 1666 rs->vnet_hdr_len = 0; 1667 } 1668 } 1669 break; 1670 case 1: 1671 l = 4 - rs->index; 1672 if (l > size) { 1673 l = size; 1674 } 1675 memcpy(rs->buf + rs->index, buf, l); 1676 buf += l; 1677 size -= l; 1678 rs->index += l; 1679 if (rs->index == 4) { 1680 /* got vnet header length */ 1681 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1682 rs->index = 0; 1683 rs->state = 2; 1684 } 1685 break; 1686 case 2: 1687 l = rs->packet_len - rs->index; 1688 if (l > size) { 1689 l = size; 1690 } 1691 if (rs->index + l <= sizeof(rs->buf)) { 1692 memcpy(rs->buf + rs->index, buf, l); 1693 } else { 1694 fprintf(stderr, "serious error: oversized packet received," 1695 "connection terminated.\n"); 1696 rs->index = rs->state = 0; 1697 return -1; 1698 } 1699 1700 rs->index += l; 1701 buf += l; 1702 size -= l; 1703 if (rs->index >= rs->packet_len) { 1704 rs->index = 0; 1705 rs->state = 0; 1706 assert(rs->finalize); 1707 rs->finalize(rs); 1708 } 1709 break; 1710 } 1711 } 1712 1713 assert(size == 0); 1714 return 0; 1715 } 1716