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 #include "qemu/osdep.h" 25 26 #include "net/net.h" 27 #include "clients.h" 28 #include "hub.h" 29 #include "net/slirp.h" 30 #include "net/eth.h" 31 #include "util.h" 32 33 #include "monitor/monitor.h" 34 #include "qemu-common.h" 35 #include "qemu/help_option.h" 36 #include "qapi/qmp/qerror.h" 37 #include "qemu/error-report.h" 38 #include "qemu/sockets.h" 39 #include "qemu/cutils.h" 40 #include "qemu/config-file.h" 41 #include "qmp-commands.h" 42 #include "hw/qdev.h" 43 #include "qemu/iov.h" 44 #include "qemu/main-loop.h" 45 #include "qapi-visit.h" 46 #include "qapi/opts-visitor.h" 47 #include "sysemu/sysemu.h" 48 #include "net/filter.h" 49 #include "qapi/string-output-visitor.h" 50 51 /* Net bridge is currently not supported for W32. */ 52 #if !defined(_WIN32) 53 # define CONFIG_NET_BRIDGE 54 #endif 55 56 static VMChangeStateEntry *net_change_state_entry; 57 static QTAILQ_HEAD(, NetClientState) net_clients; 58 59 const char *host_net_devices[] = { 60 "tap", 61 "socket", 62 "dump", 63 #ifdef CONFIG_NET_BRIDGE 64 "bridge", 65 #endif 66 #ifdef CONFIG_NETMAP 67 "netmap", 68 #endif 69 #ifdef CONFIG_SLIRP 70 "user", 71 #endif 72 #ifdef CONFIG_VDE 73 "vde", 74 #endif 75 "vhost-user", 76 NULL, 77 }; 78 79 /***********************************************************/ 80 /* network device redirectors */ 81 82 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 83 { 84 const char *p, *p1; 85 int len; 86 p = *pp; 87 p1 = strchr(p, sep); 88 if (!p1) 89 return -1; 90 len = p1 - p; 91 p1++; 92 if (buf_size > 0) { 93 if (len > buf_size - 1) 94 len = buf_size - 1; 95 memcpy(buf, p, len); 96 buf[len] = '\0'; 97 } 98 *pp = p1; 99 return 0; 100 } 101 102 int parse_host_port(struct sockaddr_in *saddr, const char *str) 103 { 104 char buf[512]; 105 struct hostent *he; 106 const char *p, *r; 107 int port; 108 109 p = str; 110 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) 111 return -1; 112 saddr->sin_family = AF_INET; 113 if (buf[0] == '\0') { 114 saddr->sin_addr.s_addr = 0; 115 } else { 116 if (qemu_isdigit(buf[0])) { 117 if (!inet_aton(buf, &saddr->sin_addr)) 118 return -1; 119 } else { 120 if ((he = gethostbyname(buf)) == NULL) 121 return - 1; 122 saddr->sin_addr = *(struct in_addr *)he->h_addr; 123 } 124 } 125 port = strtol(p, (char **)&r, 0); 126 if (r == p) 127 return -1; 128 saddr->sin_port = htons(port); 129 return 0; 130 } 131 132 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 133 { 134 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 135 macaddr[0], macaddr[1], macaddr[2], 136 macaddr[3], macaddr[4], macaddr[5]); 137 } 138 139 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 140 { 141 snprintf(nc->info_str, sizeof(nc->info_str), 142 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 143 nc->model, 144 macaddr[0], macaddr[1], macaddr[2], 145 macaddr[3], macaddr[4], macaddr[5]); 146 } 147 148 static int mac_table[256] = {0}; 149 150 static void qemu_macaddr_set_used(MACAddr *macaddr) 151 { 152 int index; 153 154 for (index = 0x56; index < 0xFF; index++) { 155 if (macaddr->a[5] == index) { 156 mac_table[index]++; 157 } 158 } 159 } 160 161 static void qemu_macaddr_set_free(MACAddr *macaddr) 162 { 163 int index; 164 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 165 166 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 167 return; 168 } 169 for (index = 0x56; index < 0xFF; index++) { 170 if (macaddr->a[5] == index) { 171 mac_table[index]--; 172 } 173 } 174 } 175 176 static int qemu_macaddr_get_free(void) 177 { 178 int index; 179 180 for (index = 0x56; index < 0xFF; index++) { 181 if (mac_table[index] == 0) { 182 return index; 183 } 184 } 185 186 return -1; 187 } 188 189 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 190 { 191 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 192 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 193 194 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 195 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 196 return; 197 } else { 198 qemu_macaddr_set_used(macaddr); 199 return; 200 } 201 } 202 203 macaddr->a[0] = 0x52; 204 macaddr->a[1] = 0x54; 205 macaddr->a[2] = 0x00; 206 macaddr->a[3] = 0x12; 207 macaddr->a[4] = 0x34; 208 macaddr->a[5] = qemu_macaddr_get_free(); 209 qemu_macaddr_set_used(macaddr); 210 } 211 212 /** 213 * Generate a name for net client 214 * 215 * Only net clients created with the legacy -net option and NICs need this. 216 */ 217 static char *assign_name(NetClientState *nc1, const char *model) 218 { 219 NetClientState *nc; 220 int id = 0; 221 222 QTAILQ_FOREACH(nc, &net_clients, next) { 223 if (nc == nc1) { 224 continue; 225 } 226 if (strcmp(nc->model, model) == 0) { 227 id++; 228 } 229 } 230 231 return g_strdup_printf("%s.%d", model, id); 232 } 233 234 static void qemu_net_client_destructor(NetClientState *nc) 235 { 236 g_free(nc); 237 } 238 239 static void qemu_net_client_setup(NetClientState *nc, 240 NetClientInfo *info, 241 NetClientState *peer, 242 const char *model, 243 const char *name, 244 NetClientDestructor *destructor) 245 { 246 nc->info = info; 247 nc->model = g_strdup(model); 248 if (name) { 249 nc->name = g_strdup(name); 250 } else { 251 nc->name = assign_name(nc, model); 252 } 253 254 if (peer) { 255 assert(!peer->peer); 256 nc->peer = peer; 257 peer->peer = nc; 258 } 259 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 260 261 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 262 nc->destructor = destructor; 263 QTAILQ_INIT(&nc->filters); 264 } 265 266 NetClientState *qemu_new_net_client(NetClientInfo *info, 267 NetClientState *peer, 268 const char *model, 269 const char *name) 270 { 271 NetClientState *nc; 272 273 assert(info->size >= sizeof(NetClientState)); 274 275 nc = g_malloc0(info->size); 276 qemu_net_client_setup(nc, info, peer, model, name, 277 qemu_net_client_destructor); 278 279 return nc; 280 } 281 282 NICState *qemu_new_nic(NetClientInfo *info, 283 NICConf *conf, 284 const char *model, 285 const char *name, 286 void *opaque) 287 { 288 NetClientState **peers = conf->peers.ncs; 289 NICState *nic; 290 int i, queues = MAX(1, conf->peers.queues); 291 292 assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC); 293 assert(info->size >= sizeof(NICState)); 294 295 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 296 nic->ncs = (void *)nic + info->size; 297 nic->conf = conf; 298 nic->opaque = opaque; 299 300 for (i = 0; i < queues; i++) { 301 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 302 NULL); 303 nic->ncs[i].queue_index = i; 304 } 305 306 return nic; 307 } 308 309 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 310 { 311 return nic->ncs + queue_index; 312 } 313 314 NetClientState *qemu_get_queue(NICState *nic) 315 { 316 return qemu_get_subqueue(nic, 0); 317 } 318 319 NICState *qemu_get_nic(NetClientState *nc) 320 { 321 NetClientState *nc0 = nc - nc->queue_index; 322 323 return (NICState *)((void *)nc0 - nc->info->size); 324 } 325 326 void *qemu_get_nic_opaque(NetClientState *nc) 327 { 328 NICState *nic = qemu_get_nic(nc); 329 330 return nic->opaque; 331 } 332 333 static void qemu_cleanup_net_client(NetClientState *nc) 334 { 335 QTAILQ_REMOVE(&net_clients, nc, next); 336 337 if (nc->info->cleanup) { 338 nc->info->cleanup(nc); 339 } 340 } 341 342 static void qemu_free_net_client(NetClientState *nc) 343 { 344 if (nc->incoming_queue) { 345 qemu_del_net_queue(nc->incoming_queue); 346 } 347 if (nc->peer) { 348 nc->peer->peer = NULL; 349 } 350 g_free(nc->name); 351 g_free(nc->model); 352 if (nc->destructor) { 353 nc->destructor(nc); 354 } 355 } 356 357 void qemu_del_net_client(NetClientState *nc) 358 { 359 NetClientState *ncs[MAX_QUEUE_NUM]; 360 int queues, i; 361 NetFilterState *nf, *next; 362 363 assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC); 364 365 /* If the NetClientState belongs to a multiqueue backend, we will change all 366 * other NetClientStates also. 367 */ 368 queues = qemu_find_net_clients_except(nc->name, ncs, 369 NET_CLIENT_OPTIONS_KIND_NIC, 370 MAX_QUEUE_NUM); 371 assert(queues != 0); 372 373 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 374 object_unparent(OBJECT(nf)); 375 } 376 377 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 378 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 379 NICState *nic = qemu_get_nic(nc->peer); 380 if (nic->peer_deleted) { 381 return; 382 } 383 nic->peer_deleted = true; 384 385 for (i = 0; i < queues; i++) { 386 ncs[i]->peer->link_down = true; 387 } 388 389 if (nc->peer->info->link_status_changed) { 390 nc->peer->info->link_status_changed(nc->peer); 391 } 392 393 for (i = 0; i < queues; i++) { 394 qemu_cleanup_net_client(ncs[i]); 395 } 396 397 return; 398 } 399 400 for (i = 0; i < queues; i++) { 401 qemu_cleanup_net_client(ncs[i]); 402 qemu_free_net_client(ncs[i]); 403 } 404 } 405 406 void qemu_del_nic(NICState *nic) 407 { 408 int i, queues = MAX(nic->conf->peers.queues, 1); 409 410 qemu_macaddr_set_free(&nic->conf->macaddr); 411 412 /* If this is a peer NIC and peer has already been deleted, free it now. */ 413 if (nic->peer_deleted) { 414 for (i = 0; i < queues; i++) { 415 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 416 } 417 } 418 419 for (i = queues - 1; i >= 0; i--) { 420 NetClientState *nc = qemu_get_subqueue(nic, i); 421 422 qemu_cleanup_net_client(nc); 423 qemu_free_net_client(nc); 424 } 425 426 g_free(nic); 427 } 428 429 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 430 { 431 NetClientState *nc; 432 433 QTAILQ_FOREACH(nc, &net_clients, next) { 434 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 435 if (nc->queue_index == 0) { 436 func(qemu_get_nic(nc), opaque); 437 } 438 } 439 } 440 } 441 442 bool qemu_has_ufo(NetClientState *nc) 443 { 444 if (!nc || !nc->info->has_ufo) { 445 return false; 446 } 447 448 return nc->info->has_ufo(nc); 449 } 450 451 bool qemu_has_vnet_hdr(NetClientState *nc) 452 { 453 if (!nc || !nc->info->has_vnet_hdr) { 454 return false; 455 } 456 457 return nc->info->has_vnet_hdr(nc); 458 } 459 460 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 461 { 462 if (!nc || !nc->info->has_vnet_hdr_len) { 463 return false; 464 } 465 466 return nc->info->has_vnet_hdr_len(nc, len); 467 } 468 469 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 470 { 471 if (!nc || !nc->info->using_vnet_hdr) { 472 return; 473 } 474 475 nc->info->using_vnet_hdr(nc, enable); 476 } 477 478 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 479 int ecn, int ufo) 480 { 481 if (!nc || !nc->info->set_offload) { 482 return; 483 } 484 485 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 486 } 487 488 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 489 { 490 if (!nc || !nc->info->set_vnet_hdr_len) { 491 return; 492 } 493 494 nc->info->set_vnet_hdr_len(nc, len); 495 } 496 497 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 498 { 499 #ifdef HOST_WORDS_BIGENDIAN 500 if (!nc || !nc->info->set_vnet_le) { 501 return -ENOSYS; 502 } 503 504 return nc->info->set_vnet_le(nc, is_le); 505 #else 506 return 0; 507 #endif 508 } 509 510 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 511 { 512 #ifdef HOST_WORDS_BIGENDIAN 513 return 0; 514 #else 515 if (!nc || !nc->info->set_vnet_be) { 516 return -ENOSYS; 517 } 518 519 return nc->info->set_vnet_be(nc, is_be); 520 #endif 521 } 522 523 int qemu_can_send_packet(NetClientState *sender) 524 { 525 int vm_running = runstate_is_running(); 526 527 if (!vm_running) { 528 return 0; 529 } 530 531 if (!sender->peer) { 532 return 1; 533 } 534 535 if (sender->peer->receive_disabled) { 536 return 0; 537 } else if (sender->peer->info->can_receive && 538 !sender->peer->info->can_receive(sender->peer)) { 539 return 0; 540 } 541 return 1; 542 } 543 544 static ssize_t filter_receive_iov(NetClientState *nc, 545 NetFilterDirection direction, 546 NetClientState *sender, 547 unsigned flags, 548 const struct iovec *iov, 549 int iovcnt, 550 NetPacketSent *sent_cb) 551 { 552 ssize_t ret = 0; 553 NetFilterState *nf = NULL; 554 555 if (direction == NET_FILTER_DIRECTION_TX) { 556 QTAILQ_FOREACH(nf, &nc->filters, next) { 557 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 558 iovcnt, sent_cb); 559 if (ret) { 560 return ret; 561 } 562 } 563 } else { 564 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) { 565 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 566 iovcnt, sent_cb); 567 if (ret) { 568 return ret; 569 } 570 } 571 } 572 573 return ret; 574 } 575 576 static ssize_t filter_receive(NetClientState *nc, 577 NetFilterDirection direction, 578 NetClientState *sender, 579 unsigned flags, 580 const uint8_t *data, 581 size_t size, 582 NetPacketSent *sent_cb) 583 { 584 struct iovec iov = { 585 .iov_base = (void *)data, 586 .iov_len = size 587 }; 588 589 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 590 } 591 592 void qemu_purge_queued_packets(NetClientState *nc) 593 { 594 if (!nc->peer) { 595 return; 596 } 597 598 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 599 } 600 601 static 602 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 603 { 604 nc->receive_disabled = 0; 605 606 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) { 607 if (net_hub_flush(nc->peer)) { 608 qemu_notify_event(); 609 } 610 } 611 if (qemu_net_queue_flush(nc->incoming_queue)) { 612 /* We emptied the queue successfully, signal to the IO thread to repoll 613 * the file descriptor (for tap, for example). 614 */ 615 qemu_notify_event(); 616 } else if (purge) { 617 /* Unable to empty the queue, purge remaining packets */ 618 qemu_net_queue_purge(nc->incoming_queue, nc); 619 } 620 } 621 622 void qemu_flush_queued_packets(NetClientState *nc) 623 { 624 qemu_flush_or_purge_queued_packets(nc, false); 625 } 626 627 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 628 unsigned flags, 629 const uint8_t *buf, int size, 630 NetPacketSent *sent_cb) 631 { 632 NetQueue *queue; 633 int ret; 634 635 #ifdef DEBUG_NET 636 printf("qemu_send_packet_async:\n"); 637 qemu_hexdump((const char *)buf, stdout, "net", size); 638 #endif 639 640 if (sender->link_down || !sender->peer) { 641 return size; 642 } 643 644 /* Let filters handle the packet first */ 645 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 646 sender, flags, buf, size, sent_cb); 647 if (ret) { 648 return ret; 649 } 650 651 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 652 sender, flags, buf, size, sent_cb); 653 if (ret) { 654 return ret; 655 } 656 657 queue = sender->peer->incoming_queue; 658 659 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 660 } 661 662 ssize_t qemu_send_packet_async(NetClientState *sender, 663 const uint8_t *buf, int size, 664 NetPacketSent *sent_cb) 665 { 666 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 667 buf, size, sent_cb); 668 } 669 670 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 671 { 672 qemu_send_packet_async(nc, buf, size, NULL); 673 } 674 675 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 676 { 677 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 678 buf, size, NULL); 679 } 680 681 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 682 int iovcnt, unsigned flags) 683 { 684 uint8_t *buf = NULL; 685 uint8_t *buffer; 686 size_t offset; 687 ssize_t ret; 688 689 if (iovcnt == 1) { 690 buffer = iov[0].iov_base; 691 offset = iov[0].iov_len; 692 } else { 693 buf = g_new(uint8_t, NET_BUFSIZE); 694 buffer = buf; 695 offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE); 696 } 697 698 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 699 ret = nc->info->receive_raw(nc, buffer, offset); 700 } else { 701 ret = nc->info->receive(nc, buffer, offset); 702 } 703 704 g_free(buf); 705 return ret; 706 } 707 708 ssize_t qemu_deliver_packet_iov(NetClientState *sender, 709 unsigned flags, 710 const struct iovec *iov, 711 int iovcnt, 712 void *opaque) 713 { 714 NetClientState *nc = opaque; 715 int ret; 716 717 if (nc->link_down) { 718 return iov_size(iov, iovcnt); 719 } 720 721 if (nc->receive_disabled) { 722 return 0; 723 } 724 725 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 726 ret = nc->info->receive_iov(nc, iov, iovcnt); 727 } else { 728 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 729 } 730 731 if (ret == 0) { 732 nc->receive_disabled = 1; 733 } 734 735 return ret; 736 } 737 738 ssize_t qemu_sendv_packet_async(NetClientState *sender, 739 const struct iovec *iov, int iovcnt, 740 NetPacketSent *sent_cb) 741 { 742 NetQueue *queue; 743 int ret; 744 745 if (sender->link_down || !sender->peer) { 746 return iov_size(iov, iovcnt); 747 } 748 749 /* Let filters handle the packet first */ 750 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 751 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 752 if (ret) { 753 return ret; 754 } 755 756 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 757 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 758 if (ret) { 759 return ret; 760 } 761 762 queue = sender->peer->incoming_queue; 763 764 return qemu_net_queue_send_iov(queue, sender, 765 QEMU_NET_PACKET_FLAG_NONE, 766 iov, iovcnt, sent_cb); 767 } 768 769 ssize_t 770 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 771 { 772 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 773 } 774 775 NetClientState *qemu_find_netdev(const char *id) 776 { 777 NetClientState *nc; 778 779 QTAILQ_FOREACH(nc, &net_clients, next) { 780 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) 781 continue; 782 if (!strcmp(nc->name, id)) { 783 return nc; 784 } 785 } 786 787 return NULL; 788 } 789 790 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 791 NetClientOptionsKind type, int max) 792 { 793 NetClientState *nc; 794 int ret = 0; 795 796 QTAILQ_FOREACH(nc, &net_clients, next) { 797 if (nc->info->type == type) { 798 continue; 799 } 800 if (!id || !strcmp(nc->name, id)) { 801 if (ret < max) { 802 ncs[ret] = nc; 803 } 804 ret++; 805 } 806 } 807 808 return ret; 809 } 810 811 static int nic_get_free_idx(void) 812 { 813 int index; 814 815 for (index = 0; index < MAX_NICS; index++) 816 if (!nd_table[index].used) 817 return index; 818 return -1; 819 } 820 821 int qemu_show_nic_models(const char *arg, const char *const *models) 822 { 823 int i; 824 825 if (!arg || !is_help_option(arg)) { 826 return 0; 827 } 828 829 fprintf(stderr, "qemu: Supported NIC models: "); 830 for (i = 0 ; models[i]; i++) 831 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); 832 return 1; 833 } 834 835 void qemu_check_nic_model(NICInfo *nd, const char *model) 836 { 837 const char *models[2]; 838 839 models[0] = model; 840 models[1] = NULL; 841 842 if (qemu_show_nic_models(nd->model, models)) 843 exit(0); 844 if (qemu_find_nic_model(nd, models, model) < 0) 845 exit(1); 846 } 847 848 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 849 const char *default_model) 850 { 851 int i; 852 853 if (!nd->model) 854 nd->model = g_strdup(default_model); 855 856 for (i = 0 ; models[i]; i++) { 857 if (strcmp(nd->model, models[i]) == 0) 858 return i; 859 } 860 861 error_report("Unsupported NIC model: %s", nd->model); 862 return -1; 863 } 864 865 static int net_init_nic(const NetClientOptions *opts, const char *name, 866 NetClientState *peer, Error **errp) 867 { 868 int idx; 869 NICInfo *nd; 870 const NetLegacyNicOptions *nic; 871 872 assert(opts->type == NET_CLIENT_OPTIONS_KIND_NIC); 873 nic = opts->u.nic.data; 874 875 idx = nic_get_free_idx(); 876 if (idx == -1 || nb_nics >= MAX_NICS) { 877 error_setg(errp, "too many NICs"); 878 return -1; 879 } 880 881 nd = &nd_table[idx]; 882 883 memset(nd, 0, sizeof(*nd)); 884 885 if (nic->has_netdev) { 886 nd->netdev = qemu_find_netdev(nic->netdev); 887 if (!nd->netdev) { 888 error_setg(errp, "netdev '%s' not found", nic->netdev); 889 return -1; 890 } 891 } else { 892 assert(peer); 893 nd->netdev = peer; 894 } 895 nd->name = g_strdup(name); 896 if (nic->has_model) { 897 nd->model = g_strdup(nic->model); 898 } 899 if (nic->has_addr) { 900 nd->devaddr = g_strdup(nic->addr); 901 } 902 903 if (nic->has_macaddr && 904 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 905 error_setg(errp, "invalid syntax for ethernet address"); 906 return -1; 907 } 908 if (nic->has_macaddr && 909 is_multicast_ether_addr(nd->macaddr.a)) { 910 error_setg(errp, 911 "NIC cannot have multicast MAC address (odd 1st byte)"); 912 return -1; 913 } 914 qemu_macaddr_default_if_unset(&nd->macaddr); 915 916 if (nic->has_vectors) { 917 if (nic->vectors > 0x7ffffff) { 918 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 919 return -1; 920 } 921 nd->nvectors = nic->vectors; 922 } else { 923 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 924 } 925 926 nd->used = 1; 927 nb_nics++; 928 929 return idx; 930 } 931 932 933 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND__MAX])( 934 const NetClientOptions *opts, 935 const char *name, 936 NetClientState *peer, Error **errp) = { 937 [NET_CLIENT_OPTIONS_KIND_NIC] = net_init_nic, 938 #ifdef CONFIG_SLIRP 939 [NET_CLIENT_OPTIONS_KIND_USER] = net_init_slirp, 940 #endif 941 [NET_CLIENT_OPTIONS_KIND_TAP] = net_init_tap, 942 [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket, 943 #ifdef CONFIG_VDE 944 [NET_CLIENT_OPTIONS_KIND_VDE] = net_init_vde, 945 #endif 946 #ifdef CONFIG_NETMAP 947 [NET_CLIENT_OPTIONS_KIND_NETMAP] = net_init_netmap, 948 #endif 949 [NET_CLIENT_OPTIONS_KIND_DUMP] = net_init_dump, 950 #ifdef CONFIG_NET_BRIDGE 951 [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge, 952 #endif 953 [NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport, 954 #ifdef CONFIG_VHOST_NET_USED 955 [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user, 956 #endif 957 #ifdef CONFIG_L2TPV3 958 [NET_CLIENT_OPTIONS_KIND_L2TPV3] = net_init_l2tpv3, 959 #endif 960 }; 961 962 963 static int net_client_init1(const void *object, int is_netdev, Error **errp) 964 { 965 const NetClientOptions *opts; 966 const char *name; 967 NetClientState *peer = NULL; 968 969 if (is_netdev) { 970 const Netdev *netdev = object; 971 opts = netdev->opts; 972 name = netdev->id; 973 974 if (opts->type == NET_CLIENT_OPTIONS_KIND_DUMP || 975 opts->type == NET_CLIENT_OPTIONS_KIND_NIC || 976 !net_client_init_fun[opts->type]) { 977 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 978 "a netdev backend type"); 979 return -1; 980 } 981 } else { 982 const NetLegacy *net = object; 983 opts = net->opts; 984 /* missing optional values have been initialized to "all bits zero" */ 985 name = net->has_id ? net->id : net->name; 986 987 if (opts->type == NET_CLIENT_OPTIONS_KIND_NONE) { 988 return 0; /* nothing to do */ 989 } 990 if (opts->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) { 991 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 992 "a net type"); 993 return -1; 994 } 995 996 if (!net_client_init_fun[opts->type]) { 997 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 998 "a net backend type (maybe it is not compiled " 999 "into this binary)"); 1000 return -1; 1001 } 1002 1003 /* Do not add to a vlan if it's a nic with a netdev= parameter. */ 1004 if (opts->type != NET_CLIENT_OPTIONS_KIND_NIC || 1005 !opts->u.nic.data->has_netdev) { 1006 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL); 1007 } 1008 } 1009 1010 if (net_client_init_fun[opts->type](opts, name, peer, errp) < 0) { 1011 /* FIXME drop when all init functions store an Error */ 1012 if (errp && !*errp) { 1013 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1014 NetClientOptionsKind_lookup[opts->type]); 1015 } 1016 return -1; 1017 } 1018 return 0; 1019 } 1020 1021 1022 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp) 1023 { 1024 void *object = NULL; 1025 Error *err = NULL; 1026 int ret = -1; 1027 Visitor *v = opts_visitor_new(opts); 1028 1029 { 1030 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1031 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1032 1033 if (ip6_net) { 1034 char buf[strlen(ip6_net) + 1]; 1035 1036 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) { 1037 /* Default 64bit prefix length. */ 1038 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort); 1039 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort); 1040 } else { 1041 /* User-specified prefix length. */ 1042 unsigned long len; 1043 int err; 1044 1045 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort); 1046 err = qemu_strtoul(ip6_net, NULL, 10, &len); 1047 1048 if (err) { 1049 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1050 "ipv6-prefix", "a number"); 1051 } else { 1052 qemu_opt_set_number(opts, "ipv6-prefixlen", len, 1053 &error_abort); 1054 } 1055 } 1056 qemu_opt_unset(opts, "ipv6-net"); 1057 } 1058 } 1059 1060 if (is_netdev) { 1061 visit_type_Netdev(v, NULL, (Netdev **)&object, &err); 1062 } else { 1063 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err); 1064 } 1065 1066 if (!err) { 1067 ret = net_client_init1(object, is_netdev, &err); 1068 } 1069 1070 if (is_netdev) { 1071 qapi_free_Netdev(object); 1072 } else { 1073 qapi_free_NetLegacy(object); 1074 } 1075 1076 error_propagate(errp, err); 1077 visit_free(v); 1078 return ret; 1079 } 1080 1081 1082 static int net_host_check_device(const char *device) 1083 { 1084 int i; 1085 for (i = 0; host_net_devices[i]; i++) { 1086 if (!strncmp(host_net_devices[i], device, 1087 strlen(host_net_devices[i]))) { 1088 return 1; 1089 } 1090 } 1091 1092 return 0; 1093 } 1094 1095 void hmp_host_net_add(Monitor *mon, const QDict *qdict) 1096 { 1097 const char *device = qdict_get_str(qdict, "device"); 1098 const char *opts_str = qdict_get_try_str(qdict, "opts"); 1099 Error *local_err = NULL; 1100 QemuOpts *opts; 1101 1102 if (!net_host_check_device(device)) { 1103 monitor_printf(mon, "invalid host network device %s\n", device); 1104 return; 1105 } 1106 1107 opts = qemu_opts_parse_noisily(qemu_find_opts("net"), 1108 opts_str ? opts_str : "", false); 1109 if (!opts) { 1110 return; 1111 } 1112 1113 qemu_opt_set(opts, "type", device, &error_abort); 1114 1115 net_client_init(opts, 0, &local_err); 1116 if (local_err) { 1117 error_report_err(local_err); 1118 monitor_printf(mon, "adding host network device %s failed\n", device); 1119 } 1120 } 1121 1122 void hmp_host_net_remove(Monitor *mon, const QDict *qdict) 1123 { 1124 NetClientState *nc; 1125 int vlan_id = qdict_get_int(qdict, "vlan_id"); 1126 const char *device = qdict_get_str(qdict, "device"); 1127 1128 nc = net_hub_find_client_by_name(vlan_id, device); 1129 if (!nc) { 1130 error_report("Host network device '%s' on hub '%d' not found", 1131 device, vlan_id); 1132 return; 1133 } 1134 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1135 error_report("invalid host network device '%s'", device); 1136 return; 1137 } 1138 1139 qemu_del_net_client(nc->peer); 1140 qemu_del_net_client(nc); 1141 } 1142 1143 void netdev_add(QemuOpts *opts, Error **errp) 1144 { 1145 net_client_init(opts, 1, errp); 1146 } 1147 1148 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1149 { 1150 Error *local_err = NULL; 1151 QemuOptsList *opts_list; 1152 QemuOpts *opts; 1153 1154 opts_list = qemu_find_opts_err("netdev", &local_err); 1155 if (local_err) { 1156 goto out; 1157 } 1158 1159 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1160 if (local_err) { 1161 goto out; 1162 } 1163 1164 netdev_add(opts, &local_err); 1165 if (local_err) { 1166 qemu_opts_del(opts); 1167 goto out; 1168 } 1169 1170 out: 1171 error_propagate(errp, local_err); 1172 } 1173 1174 void qmp_netdev_del(const char *id, Error **errp) 1175 { 1176 NetClientState *nc; 1177 QemuOpts *opts; 1178 1179 nc = qemu_find_netdev(id); 1180 if (!nc) { 1181 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1182 "Device '%s' not found", id); 1183 return; 1184 } 1185 1186 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1187 if (!opts) { 1188 error_setg(errp, "Device '%s' is not a netdev", id); 1189 return; 1190 } 1191 1192 qemu_del_net_client(nc); 1193 qemu_opts_del(opts); 1194 } 1195 1196 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1197 { 1198 char *str; 1199 ObjectProperty *prop; 1200 ObjectPropertyIterator iter; 1201 Visitor *v; 1202 1203 /* generate info str */ 1204 object_property_iter_init(&iter, OBJECT(nf)); 1205 while ((prop = object_property_iter_next(&iter))) { 1206 if (!strcmp(prop->name, "type")) { 1207 continue; 1208 } 1209 v = string_output_visitor_new(false, &str); 1210 object_property_get(OBJECT(nf), v, prop->name, NULL); 1211 visit_complete(v, &str); 1212 visit_free(v); 1213 monitor_printf(mon, ",%s=%s", prop->name, str); 1214 g_free(str); 1215 } 1216 monitor_printf(mon, "\n"); 1217 } 1218 1219 void print_net_client(Monitor *mon, NetClientState *nc) 1220 { 1221 NetFilterState *nf; 1222 1223 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1224 nc->queue_index, 1225 NetClientOptionsKind_lookup[nc->info->type], 1226 nc->info_str); 1227 if (!QTAILQ_EMPTY(&nc->filters)) { 1228 monitor_printf(mon, "filters:\n"); 1229 } 1230 QTAILQ_FOREACH(nf, &nc->filters, next) { 1231 char *path = object_get_canonical_path_component(OBJECT(nf)); 1232 1233 monitor_printf(mon, " - %s: type=%s", path, 1234 object_get_typename(OBJECT(nf))); 1235 netfilter_print_info(mon, nf); 1236 g_free(path); 1237 } 1238 } 1239 1240 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1241 Error **errp) 1242 { 1243 NetClientState *nc; 1244 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1245 1246 QTAILQ_FOREACH(nc, &net_clients, next) { 1247 RxFilterInfoList *entry; 1248 RxFilterInfo *info; 1249 1250 if (has_name && strcmp(nc->name, name) != 0) { 1251 continue; 1252 } 1253 1254 /* only query rx-filter information of NIC */ 1255 if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) { 1256 if (has_name) { 1257 error_setg(errp, "net client(%s) isn't a NIC", name); 1258 return NULL; 1259 } 1260 continue; 1261 } 1262 1263 /* only query information on queue 0 since the info is per nic, 1264 * not per queue 1265 */ 1266 if (nc->queue_index != 0) 1267 continue; 1268 1269 if (nc->info->query_rx_filter) { 1270 info = nc->info->query_rx_filter(nc); 1271 entry = g_malloc0(sizeof(*entry)); 1272 entry->value = info; 1273 1274 if (!filter_list) { 1275 filter_list = entry; 1276 } else { 1277 last_entry->next = entry; 1278 } 1279 last_entry = entry; 1280 } else if (has_name) { 1281 error_setg(errp, "net client(%s) doesn't support" 1282 " rx-filter querying", name); 1283 return NULL; 1284 } 1285 1286 if (has_name) { 1287 break; 1288 } 1289 } 1290 1291 if (filter_list == NULL && has_name) { 1292 error_setg(errp, "invalid net client name: %s", name); 1293 } 1294 1295 return filter_list; 1296 } 1297 1298 void hmp_info_network(Monitor *mon, const QDict *qdict) 1299 { 1300 NetClientState *nc, *peer; 1301 NetClientOptionsKind type; 1302 1303 net_hub_info(mon); 1304 1305 QTAILQ_FOREACH(nc, &net_clients, next) { 1306 peer = nc->peer; 1307 type = nc->info->type; 1308 1309 /* Skip if already printed in hub info */ 1310 if (net_hub_id_for_client(nc, NULL) == 0) { 1311 continue; 1312 } 1313 1314 if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) { 1315 print_net_client(mon, nc); 1316 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1317 if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) { 1318 monitor_printf(mon, " \\ "); 1319 print_net_client(mon, peer); 1320 } 1321 } 1322 } 1323 1324 void qmp_set_link(const char *name, bool up, Error **errp) 1325 { 1326 NetClientState *ncs[MAX_QUEUE_NUM]; 1327 NetClientState *nc; 1328 int queues, i; 1329 1330 queues = qemu_find_net_clients_except(name, ncs, 1331 NET_CLIENT_OPTIONS_KIND__MAX, 1332 MAX_QUEUE_NUM); 1333 1334 if (queues == 0) { 1335 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1336 "Device '%s' not found", name); 1337 return; 1338 } 1339 nc = ncs[0]; 1340 1341 for (i = 0; i < queues; i++) { 1342 ncs[i]->link_down = !up; 1343 } 1344 1345 if (nc->info->link_status_changed) { 1346 nc->info->link_status_changed(nc); 1347 } 1348 1349 if (nc->peer) { 1350 /* Change peer link only if the peer is NIC and then notify peer. 1351 * If the peer is a HUBPORT or a backend, we do not change the 1352 * link status. 1353 * 1354 * This behavior is compatible with qemu vlans where there could be 1355 * multiple clients that can still communicate with each other in 1356 * disconnected mode. For now maintain this compatibility. 1357 */ 1358 if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1359 for (i = 0; i < queues; i++) { 1360 ncs[i]->peer->link_down = !up; 1361 } 1362 } 1363 if (nc->peer->info->link_status_changed) { 1364 nc->peer->info->link_status_changed(nc->peer); 1365 } 1366 } 1367 } 1368 1369 static void net_vm_change_state_handler(void *opaque, int running, 1370 RunState state) 1371 { 1372 NetClientState *nc; 1373 NetClientState *tmp; 1374 1375 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1376 if (running) { 1377 /* Flush queued packets and wake up backends. */ 1378 if (nc->peer && qemu_can_send_packet(nc)) { 1379 qemu_flush_queued_packets(nc->peer); 1380 } 1381 } else { 1382 /* Complete all queued packets, to guarantee we don't modify 1383 * state later when VM is not running. 1384 */ 1385 qemu_flush_or_purge_queued_packets(nc, true); 1386 } 1387 } 1388 } 1389 1390 void net_cleanup(void) 1391 { 1392 NetClientState *nc; 1393 1394 /* We may del multiple entries during qemu_del_net_client(), 1395 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1396 */ 1397 while (!QTAILQ_EMPTY(&net_clients)) { 1398 nc = QTAILQ_FIRST(&net_clients); 1399 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1400 qemu_del_nic(qemu_get_nic(nc)); 1401 } else { 1402 qemu_del_net_client(nc); 1403 } 1404 } 1405 1406 qemu_del_vm_change_state_handler(net_change_state_entry); 1407 } 1408 1409 void net_check_clients(void) 1410 { 1411 NetClientState *nc; 1412 int i; 1413 1414 net_hub_check_clients(); 1415 1416 QTAILQ_FOREACH(nc, &net_clients, next) { 1417 if (!nc->peer) { 1418 fprintf(stderr, "Warning: %s %s has no peer\n", 1419 nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ? 1420 "nic" : "netdev", nc->name); 1421 } 1422 } 1423 1424 /* Check that all NICs requested via -net nic actually got created. 1425 * NICs created via -device don't need to be checked here because 1426 * they are always instantiated. 1427 */ 1428 for (i = 0; i < MAX_NICS; i++) { 1429 NICInfo *nd = &nd_table[i]; 1430 if (nd->used && !nd->instantiated) { 1431 fprintf(stderr, "Warning: requested NIC (%s, model %s) " 1432 "was not created (not supported by this machine?)\n", 1433 nd->name ? nd->name : "anonymous", 1434 nd->model ? nd->model : "unspecified"); 1435 } 1436 } 1437 } 1438 1439 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1440 { 1441 Error *local_err = NULL; 1442 1443 net_client_init(opts, 0, &local_err); 1444 if (local_err) { 1445 error_report_err(local_err); 1446 return -1; 1447 } 1448 1449 return 0; 1450 } 1451 1452 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1453 { 1454 Error *local_err = NULL; 1455 int ret; 1456 1457 ret = net_client_init(opts, 1, &local_err); 1458 if (local_err) { 1459 error_report_err(local_err); 1460 return -1; 1461 } 1462 1463 return ret; 1464 } 1465 1466 int net_init_clients(void) 1467 { 1468 QemuOptsList *net = qemu_find_opts("net"); 1469 1470 net_change_state_entry = 1471 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1472 1473 QTAILQ_INIT(&net_clients); 1474 1475 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1476 net_init_netdev, NULL, NULL)) { 1477 return -1; 1478 } 1479 1480 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) { 1481 return -1; 1482 } 1483 1484 return 0; 1485 } 1486 1487 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1488 { 1489 #if defined(CONFIG_SLIRP) 1490 int ret; 1491 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) { 1492 return ret; 1493 } 1494 #endif 1495 1496 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1497 return -1; 1498 } 1499 1500 return 0; 1501 } 1502 1503 /* From FreeBSD */ 1504 /* XXX: optimize */ 1505 unsigned compute_mcast_idx(const uint8_t *ep) 1506 { 1507 uint32_t crc; 1508 int carry, i, j; 1509 uint8_t b; 1510 1511 crc = 0xffffffff; 1512 for (i = 0; i < 6; i++) { 1513 b = *ep++; 1514 for (j = 0; j < 8; j++) { 1515 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1516 crc <<= 1; 1517 b >>= 1; 1518 if (carry) { 1519 crc = ((crc ^ POLYNOMIAL) | carry); 1520 } 1521 } 1522 } 1523 return crc >> 26; 1524 } 1525 1526 QemuOptsList qemu_netdev_opts = { 1527 .name = "netdev", 1528 .implied_opt_name = "type", 1529 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1530 .desc = { 1531 /* 1532 * no elements => accept any params 1533 * validation will happen later 1534 */ 1535 { /* end of list */ } 1536 }, 1537 }; 1538 1539 QemuOptsList qemu_net_opts = { 1540 .name = "net", 1541 .implied_opt_name = "type", 1542 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1543 .desc = { 1544 /* 1545 * no elements => accept any params 1546 * validation will happen later 1547 */ 1548 { /* end of list */ } 1549 }, 1550 }; 1551 1552 void net_socket_rs_init(SocketReadState *rs, 1553 SocketReadStateFinalize *finalize) 1554 { 1555 rs->state = 0; 1556 rs->index = 0; 1557 rs->packet_len = 0; 1558 memset(rs->buf, 0, sizeof(rs->buf)); 1559 rs->finalize = finalize; 1560 } 1561 1562 /* 1563 * Returns 1564 * 0: SocketReadState is not ready 1565 * 1: SocketReadState is ready 1566 * otherwise error occurs 1567 */ 1568 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1569 { 1570 unsigned int l; 1571 1572 while (size > 0) { 1573 /* reassemble a packet from the network */ 1574 switch (rs->state) { /* 0 = getting length, 1 = getting data */ 1575 case 0: 1576 l = 4 - rs->index; 1577 if (l > size) { 1578 l = size; 1579 } 1580 memcpy(rs->buf + rs->index, buf, l); 1581 buf += l; 1582 size -= l; 1583 rs->index += l; 1584 if (rs->index == 4) { 1585 /* got length */ 1586 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1587 rs->index = 0; 1588 rs->state = 1; 1589 } 1590 break; 1591 case 1: 1592 l = rs->packet_len - rs->index; 1593 if (l > size) { 1594 l = size; 1595 } 1596 if (rs->index + l <= sizeof(rs->buf)) { 1597 memcpy(rs->buf + rs->index, buf, l); 1598 } else { 1599 fprintf(stderr, "serious error: oversized packet received," 1600 "connection terminated.\n"); 1601 rs->index = rs->state = 0; 1602 return -1; 1603 } 1604 1605 rs->index += l; 1606 buf += l; 1607 size -= l; 1608 if (rs->index >= rs->packet_len) { 1609 rs->index = 0; 1610 rs->state = 0; 1611 if (rs->finalize) { 1612 rs->finalize(rs); 1613 } 1614 return 1; 1615 } 1616 break; 1617 } 1618 } 1619 return 0; 1620 } 1621