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 "sysemu/qtest.h" 49 #include "net/filter.h" 50 #include "qapi/string-output-visitor.h" 51 52 /* Net bridge is currently not supported for W32. */ 53 #if !defined(_WIN32) 54 # define CONFIG_NET_BRIDGE 55 #endif 56 57 static VMChangeStateEntry *net_change_state_entry; 58 static QTAILQ_HEAD(, NetClientState) net_clients; 59 60 const char *host_net_devices[] = { 61 "tap", 62 "socket", 63 "dump", 64 #ifdef CONFIG_NET_BRIDGE 65 "bridge", 66 #endif 67 #ifdef CONFIG_NETMAP 68 "netmap", 69 #endif 70 #ifdef CONFIG_SLIRP 71 "user", 72 #endif 73 #ifdef CONFIG_VDE 74 "vde", 75 #endif 76 "vhost-user", 77 NULL, 78 }; 79 80 /***********************************************************/ 81 /* network device redirectors */ 82 83 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 84 { 85 const char *p, *p1; 86 int len; 87 p = *pp; 88 p1 = strchr(p, sep); 89 if (!p1) 90 return -1; 91 len = p1 - p; 92 p1++; 93 if (buf_size > 0) { 94 if (len > buf_size - 1) 95 len = buf_size - 1; 96 memcpy(buf, p, len); 97 buf[len] = '\0'; 98 } 99 *pp = p1; 100 return 0; 101 } 102 103 int parse_host_port(struct sockaddr_in *saddr, const char *str) 104 { 105 char buf[512]; 106 struct hostent *he; 107 const char *p, *r; 108 int port; 109 110 p = str; 111 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) 112 return -1; 113 saddr->sin_family = AF_INET; 114 if (buf[0] == '\0') { 115 saddr->sin_addr.s_addr = 0; 116 } else { 117 if (qemu_isdigit(buf[0])) { 118 if (!inet_aton(buf, &saddr->sin_addr)) 119 return -1; 120 } else { 121 if ((he = gethostbyname(buf)) == NULL) 122 return - 1; 123 saddr->sin_addr = *(struct in_addr *)he->h_addr; 124 } 125 } 126 port = strtol(p, (char **)&r, 0); 127 if (r == p) 128 return -1; 129 saddr->sin_port = htons(port); 130 return 0; 131 } 132 133 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 134 { 135 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 136 macaddr[0], macaddr[1], macaddr[2], 137 macaddr[3], macaddr[4], macaddr[5]); 138 } 139 140 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 141 { 142 snprintf(nc->info_str, sizeof(nc->info_str), 143 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 144 nc->model, 145 macaddr[0], macaddr[1], macaddr[2], 146 macaddr[3], macaddr[4], macaddr[5]); 147 } 148 149 static int mac_table[256] = {0}; 150 151 static void qemu_macaddr_set_used(MACAddr *macaddr) 152 { 153 int index; 154 155 for (index = 0x56; index < 0xFF; index++) { 156 if (macaddr->a[5] == index) { 157 mac_table[index]++; 158 } 159 } 160 } 161 162 static void qemu_macaddr_set_free(MACAddr *macaddr) 163 { 164 int index; 165 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 166 167 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 168 return; 169 } 170 for (index = 0x56; index < 0xFF; index++) { 171 if (macaddr->a[5] == index) { 172 mac_table[index]--; 173 } 174 } 175 } 176 177 static int qemu_macaddr_get_free(void) 178 { 179 int index; 180 181 for (index = 0x56; index < 0xFF; index++) { 182 if (mac_table[index] == 0) { 183 return index; 184 } 185 } 186 187 return -1; 188 } 189 190 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 191 { 192 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 193 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 194 195 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 196 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 197 return; 198 } else { 199 qemu_macaddr_set_used(macaddr); 200 return; 201 } 202 } 203 204 macaddr->a[0] = 0x52; 205 macaddr->a[1] = 0x54; 206 macaddr->a[2] = 0x00; 207 macaddr->a[3] = 0x12; 208 macaddr->a[4] = 0x34; 209 macaddr->a[5] = qemu_macaddr_get_free(); 210 qemu_macaddr_set_used(macaddr); 211 } 212 213 /** 214 * Generate a name for net client 215 * 216 * Only net clients created with the legacy -net option and NICs need this. 217 */ 218 static char *assign_name(NetClientState *nc1, const char *model) 219 { 220 NetClientState *nc; 221 int id = 0; 222 223 QTAILQ_FOREACH(nc, &net_clients, next) { 224 if (nc == nc1) { 225 continue; 226 } 227 if (strcmp(nc->model, model) == 0) { 228 id++; 229 } 230 } 231 232 return g_strdup_printf("%s.%d", model, id); 233 } 234 235 static void qemu_net_client_destructor(NetClientState *nc) 236 { 237 g_free(nc); 238 } 239 240 static void qemu_net_client_setup(NetClientState *nc, 241 NetClientInfo *info, 242 NetClientState *peer, 243 const char *model, 244 const char *name, 245 NetClientDestructor *destructor) 246 { 247 nc->info = info; 248 nc->model = g_strdup(model); 249 if (name) { 250 nc->name = g_strdup(name); 251 } else { 252 nc->name = assign_name(nc, model); 253 } 254 255 if (peer) { 256 assert(!peer->peer); 257 nc->peer = peer; 258 peer->peer = nc; 259 } 260 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 261 262 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 263 nc->destructor = destructor; 264 QTAILQ_INIT(&nc->filters); 265 } 266 267 NetClientState *qemu_new_net_client(NetClientInfo *info, 268 NetClientState *peer, 269 const char *model, 270 const char *name) 271 { 272 NetClientState *nc; 273 274 assert(info->size >= sizeof(NetClientState)); 275 276 nc = g_malloc0(info->size); 277 qemu_net_client_setup(nc, info, peer, model, name, 278 qemu_net_client_destructor); 279 280 return nc; 281 } 282 283 NICState *qemu_new_nic(NetClientInfo *info, 284 NICConf *conf, 285 const char *model, 286 const char *name, 287 void *opaque) 288 { 289 NetClientState **peers = conf->peers.ncs; 290 NICState *nic; 291 int i, queues = MAX(1, conf->peers.queues); 292 293 assert(info->type == NET_CLIENT_DRIVER_NIC); 294 assert(info->size >= sizeof(NICState)); 295 296 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 297 nic->ncs = (void *)nic + info->size; 298 nic->conf = conf; 299 nic->opaque = opaque; 300 301 for (i = 0; i < queues; i++) { 302 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 303 NULL); 304 nic->ncs[i].queue_index = i; 305 } 306 307 return nic; 308 } 309 310 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 311 { 312 return nic->ncs + queue_index; 313 } 314 315 NetClientState *qemu_get_queue(NICState *nic) 316 { 317 return qemu_get_subqueue(nic, 0); 318 } 319 320 NICState *qemu_get_nic(NetClientState *nc) 321 { 322 NetClientState *nc0 = nc - nc->queue_index; 323 324 return (NICState *)((void *)nc0 - nc->info->size); 325 } 326 327 void *qemu_get_nic_opaque(NetClientState *nc) 328 { 329 NICState *nic = qemu_get_nic(nc); 330 331 return nic->opaque; 332 } 333 334 static void qemu_cleanup_net_client(NetClientState *nc) 335 { 336 QTAILQ_REMOVE(&net_clients, nc, next); 337 338 if (nc->info->cleanup) { 339 nc->info->cleanup(nc); 340 } 341 } 342 343 static void qemu_free_net_client(NetClientState *nc) 344 { 345 if (nc->incoming_queue) { 346 qemu_del_net_queue(nc->incoming_queue); 347 } 348 if (nc->peer) { 349 nc->peer->peer = NULL; 350 } 351 g_free(nc->name); 352 g_free(nc->model); 353 if (nc->destructor) { 354 nc->destructor(nc); 355 } 356 } 357 358 void qemu_del_net_client(NetClientState *nc) 359 { 360 NetClientState *ncs[MAX_QUEUE_NUM]; 361 int queues, i; 362 NetFilterState *nf, *next; 363 364 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 365 366 /* If the NetClientState belongs to a multiqueue backend, we will change all 367 * other NetClientStates also. 368 */ 369 queues = qemu_find_net_clients_except(nc->name, ncs, 370 NET_CLIENT_DRIVER_NIC, 371 MAX_QUEUE_NUM); 372 assert(queues != 0); 373 374 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 375 object_unparent(OBJECT(nf)); 376 } 377 378 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 379 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 380 NICState *nic = qemu_get_nic(nc->peer); 381 if (nic->peer_deleted) { 382 return; 383 } 384 nic->peer_deleted = true; 385 386 for (i = 0; i < queues; i++) { 387 ncs[i]->peer->link_down = true; 388 } 389 390 if (nc->peer->info->link_status_changed) { 391 nc->peer->info->link_status_changed(nc->peer); 392 } 393 394 for (i = 0; i < queues; i++) { 395 qemu_cleanup_net_client(ncs[i]); 396 } 397 398 return; 399 } 400 401 for (i = 0; i < queues; i++) { 402 qemu_cleanup_net_client(ncs[i]); 403 qemu_free_net_client(ncs[i]); 404 } 405 } 406 407 void qemu_del_nic(NICState *nic) 408 { 409 int i, queues = MAX(nic->conf->peers.queues, 1); 410 411 qemu_macaddr_set_free(&nic->conf->macaddr); 412 413 /* If this is a peer NIC and peer has already been deleted, free it now. */ 414 if (nic->peer_deleted) { 415 for (i = 0; i < queues; i++) { 416 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 417 } 418 } 419 420 for (i = queues - 1; i >= 0; i--) { 421 NetClientState *nc = qemu_get_subqueue(nic, i); 422 423 qemu_cleanup_net_client(nc); 424 qemu_free_net_client(nc); 425 } 426 427 g_free(nic); 428 } 429 430 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 431 { 432 NetClientState *nc; 433 434 QTAILQ_FOREACH(nc, &net_clients, next) { 435 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 436 if (nc->queue_index == 0) { 437 func(qemu_get_nic(nc), opaque); 438 } 439 } 440 } 441 } 442 443 bool qemu_has_ufo(NetClientState *nc) 444 { 445 if (!nc || !nc->info->has_ufo) { 446 return false; 447 } 448 449 return nc->info->has_ufo(nc); 450 } 451 452 bool qemu_has_vnet_hdr(NetClientState *nc) 453 { 454 if (!nc || !nc->info->has_vnet_hdr) { 455 return false; 456 } 457 458 return nc->info->has_vnet_hdr(nc); 459 } 460 461 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 462 { 463 if (!nc || !nc->info->has_vnet_hdr_len) { 464 return false; 465 } 466 467 return nc->info->has_vnet_hdr_len(nc, len); 468 } 469 470 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 471 { 472 if (!nc || !nc->info->using_vnet_hdr) { 473 return; 474 } 475 476 nc->info->using_vnet_hdr(nc, enable); 477 } 478 479 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 480 int ecn, int ufo) 481 { 482 if (!nc || !nc->info->set_offload) { 483 return; 484 } 485 486 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 487 } 488 489 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 490 { 491 if (!nc || !nc->info->set_vnet_hdr_len) { 492 return; 493 } 494 495 nc->info->set_vnet_hdr_len(nc, len); 496 } 497 498 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 499 { 500 #ifdef HOST_WORDS_BIGENDIAN 501 if (!nc || !nc->info->set_vnet_le) { 502 return -ENOSYS; 503 } 504 505 return nc->info->set_vnet_le(nc, is_le); 506 #else 507 return 0; 508 #endif 509 } 510 511 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 512 { 513 #ifdef HOST_WORDS_BIGENDIAN 514 return 0; 515 #else 516 if (!nc || !nc->info->set_vnet_be) { 517 return -ENOSYS; 518 } 519 520 return nc->info->set_vnet_be(nc, is_be); 521 #endif 522 } 523 524 int qemu_can_send_packet(NetClientState *sender) 525 { 526 int vm_running = runstate_is_running(); 527 528 if (!vm_running) { 529 return 0; 530 } 531 532 if (!sender->peer) { 533 return 1; 534 } 535 536 if (sender->peer->receive_disabled) { 537 return 0; 538 } else if (sender->peer->info->can_receive && 539 !sender->peer->info->can_receive(sender->peer)) { 540 return 0; 541 } 542 return 1; 543 } 544 545 static ssize_t filter_receive_iov(NetClientState *nc, 546 NetFilterDirection direction, 547 NetClientState *sender, 548 unsigned flags, 549 const struct iovec *iov, 550 int iovcnt, 551 NetPacketSent *sent_cb) 552 { 553 ssize_t ret = 0; 554 NetFilterState *nf = NULL; 555 556 if (direction == NET_FILTER_DIRECTION_TX) { 557 QTAILQ_FOREACH(nf, &nc->filters, next) { 558 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 559 iovcnt, sent_cb); 560 if (ret) { 561 return ret; 562 } 563 } 564 } else { 565 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) { 566 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 567 iovcnt, sent_cb); 568 if (ret) { 569 return ret; 570 } 571 } 572 } 573 574 return ret; 575 } 576 577 static ssize_t filter_receive(NetClientState *nc, 578 NetFilterDirection direction, 579 NetClientState *sender, 580 unsigned flags, 581 const uint8_t *data, 582 size_t size, 583 NetPacketSent *sent_cb) 584 { 585 struct iovec iov = { 586 .iov_base = (void *)data, 587 .iov_len = size 588 }; 589 590 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 591 } 592 593 void qemu_purge_queued_packets(NetClientState *nc) 594 { 595 if (!nc->peer) { 596 return; 597 } 598 599 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 600 } 601 602 static 603 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 604 { 605 nc->receive_disabled = 0; 606 607 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 608 if (net_hub_flush(nc->peer)) { 609 qemu_notify_event(); 610 } 611 } 612 if (qemu_net_queue_flush(nc->incoming_queue)) { 613 /* We emptied the queue successfully, signal to the IO thread to repoll 614 * the file descriptor (for tap, for example). 615 */ 616 qemu_notify_event(); 617 } else if (purge) { 618 /* Unable to empty the queue, purge remaining packets */ 619 qemu_net_queue_purge(nc->incoming_queue, nc); 620 } 621 } 622 623 void qemu_flush_queued_packets(NetClientState *nc) 624 { 625 qemu_flush_or_purge_queued_packets(nc, false); 626 } 627 628 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 629 unsigned flags, 630 const uint8_t *buf, int size, 631 NetPacketSent *sent_cb) 632 { 633 NetQueue *queue; 634 int ret; 635 636 #ifdef DEBUG_NET 637 printf("qemu_send_packet_async:\n"); 638 qemu_hexdump((const char *)buf, stdout, "net", size); 639 #endif 640 641 if (sender->link_down || !sender->peer) { 642 return size; 643 } 644 645 /* Let filters handle the packet first */ 646 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 647 sender, flags, buf, size, sent_cb); 648 if (ret) { 649 return ret; 650 } 651 652 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 653 sender, flags, buf, size, sent_cb); 654 if (ret) { 655 return ret; 656 } 657 658 queue = sender->peer->incoming_queue; 659 660 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 661 } 662 663 ssize_t qemu_send_packet_async(NetClientState *sender, 664 const uint8_t *buf, int size, 665 NetPacketSent *sent_cb) 666 { 667 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 668 buf, size, sent_cb); 669 } 670 671 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 672 { 673 qemu_send_packet_async(nc, buf, size, NULL); 674 } 675 676 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 677 { 678 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 679 buf, size, NULL); 680 } 681 682 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 683 int iovcnt, unsigned flags) 684 { 685 uint8_t *buf = NULL; 686 uint8_t *buffer; 687 size_t offset; 688 ssize_t ret; 689 690 if (iovcnt == 1) { 691 buffer = iov[0].iov_base; 692 offset = iov[0].iov_len; 693 } else { 694 offset = iov_size(iov, iovcnt); 695 if (offset > NET_BUFSIZE) { 696 return -1; 697 } 698 buf = g_malloc(offset); 699 buffer = buf; 700 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 701 } 702 703 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 704 ret = nc->info->receive_raw(nc, buffer, offset); 705 } else { 706 ret = nc->info->receive(nc, buffer, offset); 707 } 708 709 g_free(buf); 710 return ret; 711 } 712 713 ssize_t qemu_deliver_packet_iov(NetClientState *sender, 714 unsigned flags, 715 const struct iovec *iov, 716 int iovcnt, 717 void *opaque) 718 { 719 NetClientState *nc = opaque; 720 int ret; 721 722 if (nc->link_down) { 723 return iov_size(iov, iovcnt); 724 } 725 726 if (nc->receive_disabled) { 727 return 0; 728 } 729 730 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 731 ret = nc->info->receive_iov(nc, iov, iovcnt); 732 } else { 733 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 734 } 735 736 if (ret == 0) { 737 nc->receive_disabled = 1; 738 } 739 740 return ret; 741 } 742 743 ssize_t qemu_sendv_packet_async(NetClientState *sender, 744 const struct iovec *iov, int iovcnt, 745 NetPacketSent *sent_cb) 746 { 747 NetQueue *queue; 748 int ret; 749 750 if (sender->link_down || !sender->peer) { 751 return iov_size(iov, iovcnt); 752 } 753 754 /* Let filters handle the packet first */ 755 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 756 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 757 if (ret) { 758 return ret; 759 } 760 761 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 762 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 763 if (ret) { 764 return ret; 765 } 766 767 queue = sender->peer->incoming_queue; 768 769 return qemu_net_queue_send_iov(queue, sender, 770 QEMU_NET_PACKET_FLAG_NONE, 771 iov, iovcnt, sent_cb); 772 } 773 774 ssize_t 775 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 776 { 777 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 778 } 779 780 NetClientState *qemu_find_netdev(const char *id) 781 { 782 NetClientState *nc; 783 784 QTAILQ_FOREACH(nc, &net_clients, next) { 785 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 786 continue; 787 if (!strcmp(nc->name, id)) { 788 return nc; 789 } 790 } 791 792 return NULL; 793 } 794 795 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 796 NetClientDriver type, int max) 797 { 798 NetClientState *nc; 799 int ret = 0; 800 801 QTAILQ_FOREACH(nc, &net_clients, next) { 802 if (nc->info->type == type) { 803 continue; 804 } 805 if (!id || !strcmp(nc->name, id)) { 806 if (ret < max) { 807 ncs[ret] = nc; 808 } 809 ret++; 810 } 811 } 812 813 return ret; 814 } 815 816 static int nic_get_free_idx(void) 817 { 818 int index; 819 820 for (index = 0; index < MAX_NICS; index++) 821 if (!nd_table[index].used) 822 return index; 823 return -1; 824 } 825 826 int qemu_show_nic_models(const char *arg, const char *const *models) 827 { 828 int i; 829 830 if (!arg || !is_help_option(arg)) { 831 return 0; 832 } 833 834 fprintf(stderr, "qemu: Supported NIC models: "); 835 for (i = 0 ; models[i]; i++) 836 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); 837 return 1; 838 } 839 840 void qemu_check_nic_model(NICInfo *nd, const char *model) 841 { 842 const char *models[2]; 843 844 models[0] = model; 845 models[1] = NULL; 846 847 if (qemu_show_nic_models(nd->model, models)) 848 exit(0); 849 if (qemu_find_nic_model(nd, models, model) < 0) 850 exit(1); 851 } 852 853 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 854 const char *default_model) 855 { 856 int i; 857 858 if (!nd->model) 859 nd->model = g_strdup(default_model); 860 861 for (i = 0 ; models[i]; i++) { 862 if (strcmp(nd->model, models[i]) == 0) 863 return i; 864 } 865 866 error_report("Unsupported NIC model: %s", nd->model); 867 return -1; 868 } 869 870 static int net_init_nic(const Netdev *netdev, const char *name, 871 NetClientState *peer, Error **errp) 872 { 873 int idx; 874 NICInfo *nd; 875 const NetLegacyNicOptions *nic; 876 877 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 878 nic = &netdev->u.nic; 879 880 idx = nic_get_free_idx(); 881 if (idx == -1 || nb_nics >= MAX_NICS) { 882 error_setg(errp, "too many NICs"); 883 return -1; 884 } 885 886 nd = &nd_table[idx]; 887 888 memset(nd, 0, sizeof(*nd)); 889 890 if (nic->has_netdev) { 891 nd->netdev = qemu_find_netdev(nic->netdev); 892 if (!nd->netdev) { 893 error_setg(errp, "netdev '%s' not found", nic->netdev); 894 return -1; 895 } 896 } else { 897 assert(peer); 898 nd->netdev = peer; 899 } 900 nd->name = g_strdup(name); 901 if (nic->has_model) { 902 nd->model = g_strdup(nic->model); 903 } 904 if (nic->has_addr) { 905 nd->devaddr = g_strdup(nic->addr); 906 } 907 908 if (nic->has_macaddr && 909 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 910 error_setg(errp, "invalid syntax for ethernet address"); 911 return -1; 912 } 913 if (nic->has_macaddr && 914 is_multicast_ether_addr(nd->macaddr.a)) { 915 error_setg(errp, 916 "NIC cannot have multicast MAC address (odd 1st byte)"); 917 return -1; 918 } 919 qemu_macaddr_default_if_unset(&nd->macaddr); 920 921 if (nic->has_vectors) { 922 if (nic->vectors > 0x7ffffff) { 923 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 924 return -1; 925 } 926 nd->nvectors = nic->vectors; 927 } else { 928 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 929 } 930 931 nd->used = 1; 932 nb_nics++; 933 934 return idx; 935 } 936 937 938 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 939 const Netdev *netdev, 940 const char *name, 941 NetClientState *peer, Error **errp) = { 942 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 943 #ifdef CONFIG_SLIRP 944 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 945 #endif 946 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 947 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 948 #ifdef CONFIG_VDE 949 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 950 #endif 951 #ifdef CONFIG_NETMAP 952 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 953 #endif 954 [NET_CLIENT_DRIVER_DUMP] = net_init_dump, 955 #ifdef CONFIG_NET_BRIDGE 956 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 957 #endif 958 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 959 #ifdef CONFIG_VHOST_NET_USED 960 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 961 #endif 962 #ifdef CONFIG_L2TPV3 963 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 964 #endif 965 }; 966 967 968 static int net_client_init1(const void *object, bool is_netdev, Error **errp) 969 { 970 Netdev legacy = {0}; 971 const Netdev *netdev; 972 const char *name; 973 NetClientState *peer = NULL; 974 static bool vlan_warned; 975 976 if (is_netdev) { 977 netdev = object; 978 name = netdev->id; 979 980 if (netdev->type == NET_CLIENT_DRIVER_DUMP || 981 netdev->type == NET_CLIENT_DRIVER_NIC || 982 !net_client_init_fun[netdev->type]) { 983 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 984 "a netdev backend type"); 985 return -1; 986 } 987 } else { 988 const NetLegacy *net = object; 989 const NetLegacyOptions *opts = net->opts; 990 legacy.id = net->id; 991 netdev = &legacy; 992 /* missing optional values have been initialized to "all bits zero" */ 993 name = net->has_id ? net->id : net->name; 994 995 /* Map the old options to the new flat type */ 996 switch (opts->type) { 997 case NET_LEGACY_OPTIONS_TYPE_NONE: 998 return 0; /* nothing to do */ 999 case NET_LEGACY_OPTIONS_TYPE_NIC: 1000 legacy.type = NET_CLIENT_DRIVER_NIC; 1001 legacy.u.nic = opts->u.nic; 1002 break; 1003 case NET_LEGACY_OPTIONS_TYPE_USER: 1004 legacy.type = NET_CLIENT_DRIVER_USER; 1005 legacy.u.user = opts->u.user; 1006 break; 1007 case NET_LEGACY_OPTIONS_TYPE_TAP: 1008 legacy.type = NET_CLIENT_DRIVER_TAP; 1009 legacy.u.tap = opts->u.tap; 1010 break; 1011 case NET_LEGACY_OPTIONS_TYPE_L2TPV3: 1012 legacy.type = NET_CLIENT_DRIVER_L2TPV3; 1013 legacy.u.l2tpv3 = opts->u.l2tpv3; 1014 break; 1015 case NET_LEGACY_OPTIONS_TYPE_SOCKET: 1016 legacy.type = NET_CLIENT_DRIVER_SOCKET; 1017 legacy.u.socket = opts->u.socket; 1018 break; 1019 case NET_LEGACY_OPTIONS_TYPE_VDE: 1020 legacy.type = NET_CLIENT_DRIVER_VDE; 1021 legacy.u.vde = opts->u.vde; 1022 break; 1023 case NET_LEGACY_OPTIONS_TYPE_DUMP: 1024 legacy.type = NET_CLIENT_DRIVER_DUMP; 1025 legacy.u.dump = opts->u.dump; 1026 break; 1027 case NET_LEGACY_OPTIONS_TYPE_BRIDGE: 1028 legacy.type = NET_CLIENT_DRIVER_BRIDGE; 1029 legacy.u.bridge = opts->u.bridge; 1030 break; 1031 case NET_LEGACY_OPTIONS_TYPE_NETMAP: 1032 legacy.type = NET_CLIENT_DRIVER_NETMAP; 1033 legacy.u.netmap = opts->u.netmap; 1034 break; 1035 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER: 1036 legacy.type = NET_CLIENT_DRIVER_VHOST_USER; 1037 legacy.u.vhost_user = opts->u.vhost_user; 1038 break; 1039 default: 1040 abort(); 1041 } 1042 1043 if (!net_client_init_fun[netdev->type]) { 1044 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1045 "a net backend type (maybe it is not compiled " 1046 "into this binary)"); 1047 return -1; 1048 } 1049 1050 /* Do not add to a vlan if it's a nic with a netdev= parameter. */ 1051 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1052 !opts->u.nic.has_netdev) { 1053 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL); 1054 } 1055 1056 if (net->has_vlan && !vlan_warned) { 1057 error_report("'vlan' is deprecated. Please use 'netdev' instead."); 1058 vlan_warned = true; 1059 } 1060 } 1061 1062 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) { 1063 /* FIXME drop when all init functions store an Error */ 1064 if (errp && !*errp) { 1065 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1066 NetClientDriver_lookup[netdev->type]); 1067 } 1068 return -1; 1069 } 1070 return 0; 1071 } 1072 1073 1074 int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1075 { 1076 void *object = NULL; 1077 Error *err = NULL; 1078 int ret = -1; 1079 Visitor *v = opts_visitor_new(opts); 1080 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 buf[strlen(ip6_net) + 1]; 1087 1088 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) { 1089 /* Default 64bit prefix length. */ 1090 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort); 1091 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort); 1092 } else { 1093 /* User-specified prefix length. */ 1094 unsigned long len; 1095 int err; 1096 1097 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort); 1098 err = qemu_strtoul(ip6_net, NULL, 10, &len); 1099 1100 if (err) { 1101 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1102 "ipv6-prefix", "a number"); 1103 } else { 1104 qemu_opt_set_number(opts, "ipv6-prefixlen", len, 1105 &error_abort); 1106 } 1107 } 1108 qemu_opt_unset(opts, "ipv6-net"); 1109 } 1110 } 1111 1112 if (is_netdev) { 1113 visit_type_Netdev(v, NULL, (Netdev **)&object, &err); 1114 } else { 1115 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err); 1116 } 1117 1118 if (!err) { 1119 ret = net_client_init1(object, is_netdev, &err); 1120 } 1121 1122 if (is_netdev) { 1123 qapi_free_Netdev(object); 1124 } else { 1125 qapi_free_NetLegacy(object); 1126 } 1127 1128 error_propagate(errp, err); 1129 visit_free(v); 1130 return ret; 1131 } 1132 1133 1134 static int net_host_check_device(const char *device) 1135 { 1136 int i; 1137 for (i = 0; host_net_devices[i]; i++) { 1138 if (!strncmp(host_net_devices[i], device, 1139 strlen(host_net_devices[i]))) { 1140 return 1; 1141 } 1142 } 1143 1144 return 0; 1145 } 1146 1147 void hmp_host_net_add(Monitor *mon, const QDict *qdict) 1148 { 1149 const char *device = qdict_get_str(qdict, "device"); 1150 const char *opts_str = qdict_get_try_str(qdict, "opts"); 1151 Error *local_err = NULL; 1152 QemuOpts *opts; 1153 static bool warned; 1154 1155 if (!warned && !qtest_enabled()) { 1156 error_report("host_net_add is deprecated, use netdev_add instead"); 1157 warned = true; 1158 } 1159 1160 if (!net_host_check_device(device)) { 1161 monitor_printf(mon, "invalid host network device %s\n", device); 1162 return; 1163 } 1164 1165 opts = qemu_opts_parse_noisily(qemu_find_opts("net"), 1166 opts_str ? opts_str : "", false); 1167 if (!opts) { 1168 return; 1169 } 1170 1171 qemu_opt_set(opts, "type", device, &error_abort); 1172 1173 net_client_init(opts, false, &local_err); 1174 if (local_err) { 1175 error_report_err(local_err); 1176 monitor_printf(mon, "adding host network device %s failed\n", device); 1177 } 1178 } 1179 1180 void hmp_host_net_remove(Monitor *mon, const QDict *qdict) 1181 { 1182 NetClientState *nc; 1183 int vlan_id = qdict_get_int(qdict, "vlan_id"); 1184 const char *device = qdict_get_str(qdict, "device"); 1185 static bool warned; 1186 1187 if (!warned && !qtest_enabled()) { 1188 error_report("host_net_remove is deprecated, use netdev_del instead"); 1189 warned = true; 1190 } 1191 1192 nc = net_hub_find_client_by_name(vlan_id, device); 1193 if (!nc) { 1194 error_report("Host network device '%s' on hub '%d' not found", 1195 device, vlan_id); 1196 return; 1197 } 1198 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1199 error_report("invalid host network device '%s'", device); 1200 return; 1201 } 1202 1203 qemu_del_net_client(nc->peer); 1204 qemu_del_net_client(nc); 1205 qemu_opts_del(qemu_opts_find(qemu_find_opts("net"), device)); 1206 } 1207 1208 void netdev_add(QemuOpts *opts, Error **errp) 1209 { 1210 net_client_init(opts, true, errp); 1211 } 1212 1213 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1214 { 1215 Error *local_err = NULL; 1216 QemuOptsList *opts_list; 1217 QemuOpts *opts; 1218 1219 opts_list = qemu_find_opts_err("netdev", &local_err); 1220 if (local_err) { 1221 goto out; 1222 } 1223 1224 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1225 if (local_err) { 1226 goto out; 1227 } 1228 1229 netdev_add(opts, &local_err); 1230 if (local_err) { 1231 qemu_opts_del(opts); 1232 goto out; 1233 } 1234 1235 out: 1236 error_propagate(errp, local_err); 1237 } 1238 1239 void qmp_netdev_del(const char *id, Error **errp) 1240 { 1241 NetClientState *nc; 1242 QemuOpts *opts; 1243 1244 nc = qemu_find_netdev(id); 1245 if (!nc) { 1246 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1247 "Device '%s' not found", id); 1248 return; 1249 } 1250 1251 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1252 if (!opts) { 1253 error_setg(errp, "Device '%s' is not a netdev", id); 1254 return; 1255 } 1256 1257 qemu_del_net_client(nc); 1258 qemu_opts_del(opts); 1259 } 1260 1261 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1262 { 1263 char *str; 1264 ObjectProperty *prop; 1265 ObjectPropertyIterator iter; 1266 Visitor *v; 1267 1268 /* generate info str */ 1269 object_property_iter_init(&iter, OBJECT(nf)); 1270 while ((prop = object_property_iter_next(&iter))) { 1271 if (!strcmp(prop->name, "type")) { 1272 continue; 1273 } 1274 v = string_output_visitor_new(false, &str); 1275 object_property_get(OBJECT(nf), v, prop->name, NULL); 1276 visit_complete(v, &str); 1277 visit_free(v); 1278 monitor_printf(mon, ",%s=%s", prop->name, str); 1279 g_free(str); 1280 } 1281 monitor_printf(mon, "\n"); 1282 } 1283 1284 void print_net_client(Monitor *mon, NetClientState *nc) 1285 { 1286 NetFilterState *nf; 1287 1288 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1289 nc->queue_index, 1290 NetClientDriver_lookup[nc->info->type], 1291 nc->info_str); 1292 if (!QTAILQ_EMPTY(&nc->filters)) { 1293 monitor_printf(mon, "filters:\n"); 1294 } 1295 QTAILQ_FOREACH(nf, &nc->filters, next) { 1296 char *path = object_get_canonical_path_component(OBJECT(nf)); 1297 1298 monitor_printf(mon, " - %s: type=%s", path, 1299 object_get_typename(OBJECT(nf))); 1300 netfilter_print_info(mon, nf); 1301 g_free(path); 1302 } 1303 } 1304 1305 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1306 Error **errp) 1307 { 1308 NetClientState *nc; 1309 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1310 1311 QTAILQ_FOREACH(nc, &net_clients, next) { 1312 RxFilterInfoList *entry; 1313 RxFilterInfo *info; 1314 1315 if (has_name && strcmp(nc->name, name) != 0) { 1316 continue; 1317 } 1318 1319 /* only query rx-filter information of NIC */ 1320 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1321 if (has_name) { 1322 error_setg(errp, "net client(%s) isn't a NIC", name); 1323 return NULL; 1324 } 1325 continue; 1326 } 1327 1328 /* only query information on queue 0 since the info is per nic, 1329 * not per queue 1330 */ 1331 if (nc->queue_index != 0) 1332 continue; 1333 1334 if (nc->info->query_rx_filter) { 1335 info = nc->info->query_rx_filter(nc); 1336 entry = g_malloc0(sizeof(*entry)); 1337 entry->value = info; 1338 1339 if (!filter_list) { 1340 filter_list = entry; 1341 } else { 1342 last_entry->next = entry; 1343 } 1344 last_entry = entry; 1345 } else if (has_name) { 1346 error_setg(errp, "net client(%s) doesn't support" 1347 " rx-filter querying", name); 1348 return NULL; 1349 } 1350 1351 if (has_name) { 1352 break; 1353 } 1354 } 1355 1356 if (filter_list == NULL && has_name) { 1357 error_setg(errp, "invalid net client name: %s", name); 1358 } 1359 1360 return filter_list; 1361 } 1362 1363 void hmp_info_network(Monitor *mon, const QDict *qdict) 1364 { 1365 NetClientState *nc, *peer; 1366 NetClientDriver type; 1367 1368 net_hub_info(mon); 1369 1370 QTAILQ_FOREACH(nc, &net_clients, next) { 1371 peer = nc->peer; 1372 type = nc->info->type; 1373 1374 /* Skip if already printed in hub info */ 1375 if (net_hub_id_for_client(nc, NULL) == 0) { 1376 continue; 1377 } 1378 1379 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1380 print_net_client(mon, nc); 1381 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1382 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1383 monitor_printf(mon, " \\ "); 1384 print_net_client(mon, peer); 1385 } 1386 } 1387 } 1388 1389 void qmp_set_link(const char *name, bool up, Error **errp) 1390 { 1391 NetClientState *ncs[MAX_QUEUE_NUM]; 1392 NetClientState *nc; 1393 int queues, i; 1394 1395 queues = qemu_find_net_clients_except(name, ncs, 1396 NET_CLIENT_DRIVER__MAX, 1397 MAX_QUEUE_NUM); 1398 1399 if (queues == 0) { 1400 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1401 "Device '%s' not found", name); 1402 return; 1403 } 1404 nc = ncs[0]; 1405 1406 for (i = 0; i < queues; i++) { 1407 ncs[i]->link_down = !up; 1408 } 1409 1410 if (nc->info->link_status_changed) { 1411 nc->info->link_status_changed(nc); 1412 } 1413 1414 if (nc->peer) { 1415 /* Change peer link only if the peer is NIC and then notify peer. 1416 * If the peer is a HUBPORT or a backend, we do not change the 1417 * link status. 1418 * 1419 * This behavior is compatible with qemu vlans where there could be 1420 * multiple clients that can still communicate with each other in 1421 * disconnected mode. For now maintain this compatibility. 1422 */ 1423 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1424 for (i = 0; i < queues; i++) { 1425 ncs[i]->peer->link_down = !up; 1426 } 1427 } 1428 if (nc->peer->info->link_status_changed) { 1429 nc->peer->info->link_status_changed(nc->peer); 1430 } 1431 } 1432 } 1433 1434 static void net_vm_change_state_handler(void *opaque, int running, 1435 RunState state) 1436 { 1437 NetClientState *nc; 1438 NetClientState *tmp; 1439 1440 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1441 if (running) { 1442 /* Flush queued packets and wake up backends. */ 1443 if (nc->peer && qemu_can_send_packet(nc)) { 1444 qemu_flush_queued_packets(nc->peer); 1445 } 1446 } else { 1447 /* Complete all queued packets, to guarantee we don't modify 1448 * state later when VM is not running. 1449 */ 1450 qemu_flush_or_purge_queued_packets(nc, true); 1451 } 1452 } 1453 } 1454 1455 void net_cleanup(void) 1456 { 1457 NetClientState *nc; 1458 1459 /* We may del multiple entries during qemu_del_net_client(), 1460 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1461 */ 1462 while (!QTAILQ_EMPTY(&net_clients)) { 1463 nc = QTAILQ_FIRST(&net_clients); 1464 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1465 qemu_del_nic(qemu_get_nic(nc)); 1466 } else { 1467 qemu_del_net_client(nc); 1468 } 1469 } 1470 1471 qemu_del_vm_change_state_handler(net_change_state_entry); 1472 } 1473 1474 void net_check_clients(void) 1475 { 1476 NetClientState *nc; 1477 int i; 1478 1479 net_hub_check_clients(); 1480 1481 QTAILQ_FOREACH(nc, &net_clients, next) { 1482 if (!nc->peer) { 1483 fprintf(stderr, "Warning: %s %s has no peer\n", 1484 nc->info->type == NET_CLIENT_DRIVER_NIC ? 1485 "nic" : "netdev", nc->name); 1486 } 1487 } 1488 1489 /* Check that all NICs requested via -net nic actually got created. 1490 * NICs created via -device don't need to be checked here because 1491 * they are always instantiated. 1492 */ 1493 for (i = 0; i < MAX_NICS; i++) { 1494 NICInfo *nd = &nd_table[i]; 1495 if (nd->used && !nd->instantiated) { 1496 fprintf(stderr, "Warning: requested NIC (%s, model %s) " 1497 "was not created (not supported by this machine?)\n", 1498 nd->name ? nd->name : "anonymous", 1499 nd->model ? nd->model : "unspecified"); 1500 } 1501 } 1502 } 1503 1504 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1505 { 1506 Error *local_err = NULL; 1507 1508 net_client_init(opts, false, &local_err); 1509 if (local_err) { 1510 error_report_err(local_err); 1511 return -1; 1512 } 1513 1514 return 0; 1515 } 1516 1517 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1518 { 1519 Error *local_err = NULL; 1520 int ret; 1521 1522 ret = net_client_init(opts, true, &local_err); 1523 if (local_err) { 1524 error_report_err(local_err); 1525 return -1; 1526 } 1527 1528 return ret; 1529 } 1530 1531 int net_init_clients(void) 1532 { 1533 QemuOptsList *net = qemu_find_opts("net"); 1534 1535 net_change_state_entry = 1536 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1537 1538 QTAILQ_INIT(&net_clients); 1539 1540 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1541 net_init_netdev, NULL, NULL)) { 1542 return -1; 1543 } 1544 1545 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) { 1546 return -1; 1547 } 1548 1549 return 0; 1550 } 1551 1552 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1553 { 1554 #if defined(CONFIG_SLIRP) 1555 int ret; 1556 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) { 1557 return ret; 1558 } 1559 #endif 1560 1561 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1562 return -1; 1563 } 1564 1565 return 0; 1566 } 1567 1568 /* From FreeBSD */ 1569 /* XXX: optimize */ 1570 unsigned compute_mcast_idx(const uint8_t *ep) 1571 { 1572 uint32_t crc; 1573 int carry, i, j; 1574 uint8_t b; 1575 1576 crc = 0xffffffff; 1577 for (i = 0; i < 6; i++) { 1578 b = *ep++; 1579 for (j = 0; j < 8; j++) { 1580 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1581 crc <<= 1; 1582 b >>= 1; 1583 if (carry) { 1584 crc = ((crc ^ POLYNOMIAL) | carry); 1585 } 1586 } 1587 } 1588 return crc >> 26; 1589 } 1590 1591 QemuOptsList qemu_netdev_opts = { 1592 .name = "netdev", 1593 .implied_opt_name = "type", 1594 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1595 .desc = { 1596 /* 1597 * no elements => accept any params 1598 * validation will happen later 1599 */ 1600 { /* end of list */ } 1601 }, 1602 }; 1603 1604 QemuOptsList qemu_net_opts = { 1605 .name = "net", 1606 .implied_opt_name = "type", 1607 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1608 .desc = { 1609 /* 1610 * no elements => accept any params 1611 * validation will happen later 1612 */ 1613 { /* end of list */ } 1614 }, 1615 }; 1616 1617 void net_socket_rs_init(SocketReadState *rs, 1618 SocketReadStateFinalize *finalize) 1619 { 1620 rs->state = 0; 1621 rs->index = 0; 1622 rs->packet_len = 0; 1623 memset(rs->buf, 0, sizeof(rs->buf)); 1624 rs->finalize = finalize; 1625 } 1626 1627 /* 1628 * Returns 1629 * 0: success 1630 * -1: error occurs 1631 */ 1632 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1633 { 1634 unsigned int l; 1635 1636 while (size > 0) { 1637 /* reassemble a packet from the network */ 1638 switch (rs->state) { /* 0 = getting length, 1 = getting data */ 1639 case 0: 1640 l = 4 - rs->index; 1641 if (l > size) { 1642 l = size; 1643 } 1644 memcpy(rs->buf + rs->index, buf, l); 1645 buf += l; 1646 size -= l; 1647 rs->index += l; 1648 if (rs->index == 4) { 1649 /* got length */ 1650 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1651 rs->index = 0; 1652 rs->state = 1; 1653 } 1654 break; 1655 case 1: 1656 l = rs->packet_len - rs->index; 1657 if (l > size) { 1658 l = size; 1659 } 1660 if (rs->index + l <= sizeof(rs->buf)) { 1661 memcpy(rs->buf + rs->index, buf, l); 1662 } else { 1663 fprintf(stderr, "serious error: oversized packet received," 1664 "connection terminated.\n"); 1665 rs->index = rs->state = 0; 1666 return -1; 1667 } 1668 1669 rs->index += l; 1670 buf += l; 1671 size -= l; 1672 if (rs->index >= rs->packet_len) { 1673 rs->index = 0; 1674 rs->state = 0; 1675 assert(rs->finalize); 1676 rs->finalize(rs); 1677 } 1678 break; 1679 } 1680 } 1681 1682 assert(size == 0); 1683 return 0; 1684 } 1685