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 #include "qemu-common.h" 27 28 #include "net/net.h" 29 #include "clients.h" 30 #include "hub.h" 31 #include "hw/qdev-properties.h" 32 #include "net/slirp.h" 33 #include "net/eth.h" 34 #include "util.h" 35 36 #include "monitor/monitor.h" 37 #include "qemu/help_option.h" 38 #include "qapi/qapi-commands-net.h" 39 #include "qapi/qapi-visit-net.h" 40 #include "qapi/qmp/qdict.h" 41 #include "qapi/qmp/qerror.h" 42 #include "qemu/error-report.h" 43 #include "qemu/sockets.h" 44 #include "qemu/cutils.h" 45 #include "qemu/config-file.h" 46 #include "qemu/ctype.h" 47 #include "qemu/id.h" 48 #include "qemu/iov.h" 49 #include "qemu/qemu-print.h" 50 #include "qemu/main-loop.h" 51 #include "qemu/option.h" 52 #include "qapi/error.h" 53 #include "qapi/opts-visitor.h" 54 #include "sysemu/runstate.h" 55 #include "net/colo-compare.h" 56 #include "net/filter.h" 57 #include "qapi/string-output-visitor.h" 58 59 /* Net bridge is currently not supported for W32. */ 60 #if !defined(_WIN32) 61 # define CONFIG_NET_BRIDGE 62 #endif 63 64 static VMChangeStateEntry *net_change_state_entry; 65 static QTAILQ_HEAD(, NetClientState) net_clients; 66 67 /***********************************************************/ 68 /* network device redirectors */ 69 70 int parse_host_port(struct sockaddr_in *saddr, const char *str, 71 Error **errp) 72 { 73 gchar **substrings; 74 struct hostent *he; 75 const char *addr, *p, *r; 76 int port, ret = 0; 77 78 memset(saddr, 0, sizeof(*saddr)); 79 80 substrings = g_strsplit(str, ":", 2); 81 if (!substrings || !substrings[0] || !substrings[1]) { 82 error_setg(errp, "host address '%s' doesn't contain ':' " 83 "separating host from port", str); 84 ret = -1; 85 goto out; 86 } 87 88 addr = substrings[0]; 89 p = substrings[1]; 90 91 saddr->sin_family = AF_INET; 92 if (addr[0] == '\0') { 93 saddr->sin_addr.s_addr = 0; 94 } else { 95 if (qemu_isdigit(addr[0])) { 96 if (!inet_aton(addr, &saddr->sin_addr)) { 97 error_setg(errp, "host address '%s' is not a valid " 98 "IPv4 address", addr); 99 ret = -1; 100 goto out; 101 } 102 } else { 103 he = gethostbyname(addr); 104 if (he == NULL) { 105 error_setg(errp, "can't resolve host address '%s'", addr); 106 ret = -1; 107 goto out; 108 } 109 saddr->sin_addr = *(struct in_addr *)he->h_addr; 110 } 111 } 112 port = strtol(p, (char **)&r, 0); 113 if (r == p) { 114 error_setg(errp, "port number '%s' is invalid", p); 115 ret = -1; 116 goto out; 117 } 118 saddr->sin_port = htons(port); 119 120 out: 121 g_strfreev(substrings); 122 return ret; 123 } 124 125 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 126 { 127 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 128 macaddr[0], macaddr[1], macaddr[2], 129 macaddr[3], macaddr[4], macaddr[5]); 130 } 131 132 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 133 { 134 snprintf(nc->info_str, sizeof(nc->info_str), 135 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 136 nc->model, 137 macaddr[0], macaddr[1], macaddr[2], 138 macaddr[3], macaddr[4], macaddr[5]); 139 } 140 141 static int mac_table[256] = {0}; 142 143 static void qemu_macaddr_set_used(MACAddr *macaddr) 144 { 145 int index; 146 147 for (index = 0x56; index < 0xFF; index++) { 148 if (macaddr->a[5] == index) { 149 mac_table[index]++; 150 } 151 } 152 } 153 154 static void qemu_macaddr_set_free(MACAddr *macaddr) 155 { 156 int index; 157 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 158 159 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 160 return; 161 } 162 for (index = 0x56; index < 0xFF; index++) { 163 if (macaddr->a[5] == index) { 164 mac_table[index]--; 165 } 166 } 167 } 168 169 static int qemu_macaddr_get_free(void) 170 { 171 int index; 172 173 for (index = 0x56; index < 0xFF; index++) { 174 if (mac_table[index] == 0) { 175 return index; 176 } 177 } 178 179 return -1; 180 } 181 182 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 183 { 184 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 185 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 186 187 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 188 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 189 return; 190 } else { 191 qemu_macaddr_set_used(macaddr); 192 return; 193 } 194 } 195 196 macaddr->a[0] = 0x52; 197 macaddr->a[1] = 0x54; 198 macaddr->a[2] = 0x00; 199 macaddr->a[3] = 0x12; 200 macaddr->a[4] = 0x34; 201 macaddr->a[5] = qemu_macaddr_get_free(); 202 qemu_macaddr_set_used(macaddr); 203 } 204 205 /** 206 * Generate a name for net client 207 * 208 * Only net clients created with the legacy -net option and NICs need this. 209 */ 210 static char *assign_name(NetClientState *nc1, const char *model) 211 { 212 NetClientState *nc; 213 int id = 0; 214 215 QTAILQ_FOREACH(nc, &net_clients, next) { 216 if (nc == nc1) { 217 continue; 218 } 219 if (strcmp(nc->model, model) == 0) { 220 id++; 221 } 222 } 223 224 return g_strdup_printf("%s.%d", model, id); 225 } 226 227 static void qemu_net_client_destructor(NetClientState *nc) 228 { 229 g_free(nc); 230 } 231 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 232 unsigned flags, 233 const struct iovec *iov, 234 int iovcnt, 235 void *opaque); 236 237 static void qemu_net_client_setup(NetClientState *nc, 238 NetClientInfo *info, 239 NetClientState *peer, 240 const char *model, 241 const char *name, 242 NetClientDestructor *destructor) 243 { 244 nc->info = info; 245 nc->model = g_strdup(model); 246 if (name) { 247 nc->name = g_strdup(name); 248 } else { 249 nc->name = assign_name(nc, model); 250 } 251 252 if (peer) { 253 assert(!peer->peer); 254 nc->peer = peer; 255 peer->peer = nc; 256 } 257 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 258 259 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 260 nc->destructor = destructor; 261 QTAILQ_INIT(&nc->filters); 262 } 263 264 NetClientState *qemu_new_net_client(NetClientInfo *info, 265 NetClientState *peer, 266 const char *model, 267 const char *name) 268 { 269 NetClientState *nc; 270 271 assert(info->size >= sizeof(NetClientState)); 272 273 nc = g_malloc0(info->size); 274 qemu_net_client_setup(nc, info, peer, model, name, 275 qemu_net_client_destructor); 276 277 return nc; 278 } 279 280 NICState *qemu_new_nic(NetClientInfo *info, 281 NICConf *conf, 282 const char *model, 283 const char *name, 284 void *opaque) 285 { 286 NetClientState **peers = conf->peers.ncs; 287 NICState *nic; 288 int i, queues = MAX(1, conf->peers.queues); 289 290 assert(info->type == NET_CLIENT_DRIVER_NIC); 291 assert(info->size >= sizeof(NICState)); 292 293 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 294 nic->ncs = (void *)nic + info->size; 295 nic->conf = conf; 296 nic->opaque = opaque; 297 298 for (i = 0; i < queues; i++) { 299 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 300 NULL); 301 nic->ncs[i].queue_index = i; 302 } 303 304 return nic; 305 } 306 307 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 308 { 309 return nic->ncs + queue_index; 310 } 311 312 NetClientState *qemu_get_queue(NICState *nic) 313 { 314 return qemu_get_subqueue(nic, 0); 315 } 316 317 NICState *qemu_get_nic(NetClientState *nc) 318 { 319 NetClientState *nc0 = nc - nc->queue_index; 320 321 return (NICState *)((void *)nc0 - nc->info->size); 322 } 323 324 void *qemu_get_nic_opaque(NetClientState *nc) 325 { 326 NICState *nic = qemu_get_nic(nc); 327 328 return nic->opaque; 329 } 330 331 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 332 { 333 assert(nc != NULL); 334 NetClientState *ncs = nc + queue_index; 335 return ncs->peer; 336 } 337 338 static void qemu_cleanup_net_client(NetClientState *nc) 339 { 340 QTAILQ_REMOVE(&net_clients, nc, next); 341 342 if (nc->info->cleanup) { 343 nc->info->cleanup(nc); 344 } 345 } 346 347 static void qemu_free_net_client(NetClientState *nc) 348 { 349 if (nc->incoming_queue) { 350 qemu_del_net_queue(nc->incoming_queue); 351 } 352 if (nc->peer) { 353 nc->peer->peer = NULL; 354 } 355 g_free(nc->name); 356 g_free(nc->model); 357 if (nc->destructor) { 358 nc->destructor(nc); 359 } 360 } 361 362 void qemu_del_net_client(NetClientState *nc) 363 { 364 NetClientState *ncs[MAX_QUEUE_NUM]; 365 int queues, i; 366 NetFilterState *nf, *next; 367 368 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 369 370 /* If the NetClientState belongs to a multiqueue backend, we will change all 371 * other NetClientStates also. 372 */ 373 queues = qemu_find_net_clients_except(nc->name, ncs, 374 NET_CLIENT_DRIVER_NIC, 375 MAX_QUEUE_NUM); 376 assert(queues != 0); 377 378 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 379 object_unparent(OBJECT(nf)); 380 } 381 382 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 383 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 384 NICState *nic = qemu_get_nic(nc->peer); 385 if (nic->peer_deleted) { 386 return; 387 } 388 nic->peer_deleted = true; 389 390 for (i = 0; i < queues; i++) { 391 ncs[i]->peer->link_down = true; 392 } 393 394 if (nc->peer->info->link_status_changed) { 395 nc->peer->info->link_status_changed(nc->peer); 396 } 397 398 for (i = 0; i < queues; i++) { 399 qemu_cleanup_net_client(ncs[i]); 400 } 401 402 return; 403 } 404 405 for (i = 0; i < queues; i++) { 406 qemu_cleanup_net_client(ncs[i]); 407 qemu_free_net_client(ncs[i]); 408 } 409 } 410 411 void qemu_del_nic(NICState *nic) 412 { 413 int i, queues = MAX(nic->conf->peers.queues, 1); 414 415 qemu_macaddr_set_free(&nic->conf->macaddr); 416 417 for (i = 0; i < queues; i++) { 418 NetClientState *nc = qemu_get_subqueue(nic, i); 419 /* If this is a peer NIC and peer has already been deleted, free it now. */ 420 if (nic->peer_deleted) { 421 qemu_free_net_client(nc->peer); 422 } else if (nc->peer) { 423 /* if there are RX packets pending, complete them */ 424 qemu_purge_queued_packets(nc->peer); 425 } 426 } 427 428 for (i = queues - 1; i >= 0; i--) { 429 NetClientState *nc = qemu_get_subqueue(nic, i); 430 431 qemu_cleanup_net_client(nc); 432 qemu_free_net_client(nc); 433 } 434 435 g_free(nic); 436 } 437 438 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 439 { 440 NetClientState *nc; 441 442 QTAILQ_FOREACH(nc, &net_clients, next) { 443 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 444 if (nc->queue_index == 0) { 445 func(qemu_get_nic(nc), opaque); 446 } 447 } 448 } 449 } 450 451 bool qemu_has_ufo(NetClientState *nc) 452 { 453 if (!nc || !nc->info->has_ufo) { 454 return false; 455 } 456 457 return nc->info->has_ufo(nc); 458 } 459 460 bool qemu_has_vnet_hdr(NetClientState *nc) 461 { 462 if (!nc || !nc->info->has_vnet_hdr) { 463 return false; 464 } 465 466 return nc->info->has_vnet_hdr(nc); 467 } 468 469 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 470 { 471 if (!nc || !nc->info->has_vnet_hdr_len) { 472 return false; 473 } 474 475 return nc->info->has_vnet_hdr_len(nc, len); 476 } 477 478 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 479 { 480 if (!nc || !nc->info->using_vnet_hdr) { 481 return; 482 } 483 484 nc->info->using_vnet_hdr(nc, enable); 485 } 486 487 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 488 int ecn, int ufo) 489 { 490 if (!nc || !nc->info->set_offload) { 491 return; 492 } 493 494 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 495 } 496 497 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 498 { 499 if (!nc || !nc->info->set_vnet_hdr_len) { 500 return; 501 } 502 503 nc->vnet_hdr_len = len; 504 nc->info->set_vnet_hdr_len(nc, len); 505 } 506 507 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 508 { 509 #ifdef HOST_WORDS_BIGENDIAN 510 if (!nc || !nc->info->set_vnet_le) { 511 return -ENOSYS; 512 } 513 514 return nc->info->set_vnet_le(nc, is_le); 515 #else 516 return 0; 517 #endif 518 } 519 520 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 521 { 522 #ifdef HOST_WORDS_BIGENDIAN 523 return 0; 524 #else 525 if (!nc || !nc->info->set_vnet_be) { 526 return -ENOSYS; 527 } 528 529 return nc->info->set_vnet_be(nc, is_be); 530 #endif 531 } 532 533 int qemu_can_receive_packet(NetClientState *nc) 534 { 535 if (nc->receive_disabled) { 536 return 0; 537 } else if (nc->info->can_receive && 538 !nc->info->can_receive(nc)) { 539 return 0; 540 } 541 return 1; 542 } 543 544 int qemu_can_send_packet(NetClientState *sender) 545 { 546 int vm_running = runstate_is_running(); 547 548 if (!vm_running) { 549 return 0; 550 } 551 552 if (!sender->peer) { 553 return 1; 554 } 555 556 return qemu_can_receive_packet(sender->peer); 557 } 558 559 static ssize_t filter_receive_iov(NetClientState *nc, 560 NetFilterDirection direction, 561 NetClientState *sender, 562 unsigned flags, 563 const struct iovec *iov, 564 int iovcnt, 565 NetPacketSent *sent_cb) 566 { 567 ssize_t ret = 0; 568 NetFilterState *nf = NULL; 569 570 if (direction == NET_FILTER_DIRECTION_TX) { 571 QTAILQ_FOREACH(nf, &nc->filters, next) { 572 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 573 iovcnt, sent_cb); 574 if (ret) { 575 return ret; 576 } 577 } 578 } else { 579 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 580 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 581 iovcnt, sent_cb); 582 if (ret) { 583 return ret; 584 } 585 } 586 } 587 588 return ret; 589 } 590 591 static ssize_t filter_receive(NetClientState *nc, 592 NetFilterDirection direction, 593 NetClientState *sender, 594 unsigned flags, 595 const uint8_t *data, 596 size_t size, 597 NetPacketSent *sent_cb) 598 { 599 struct iovec iov = { 600 .iov_base = (void *)data, 601 .iov_len = size 602 }; 603 604 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 605 } 606 607 void qemu_purge_queued_packets(NetClientState *nc) 608 { 609 if (!nc->peer) { 610 return; 611 } 612 613 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 614 } 615 616 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 617 { 618 nc->receive_disabled = 0; 619 620 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 621 if (net_hub_flush(nc->peer)) { 622 qemu_notify_event(); 623 } 624 } 625 if (qemu_net_queue_flush(nc->incoming_queue)) { 626 /* We emptied the queue successfully, signal to the IO thread to repoll 627 * the file descriptor (for tap, for example). 628 */ 629 qemu_notify_event(); 630 } else if (purge) { 631 /* Unable to empty the queue, purge remaining packets */ 632 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 633 } 634 } 635 636 void qemu_flush_queued_packets(NetClientState *nc) 637 { 638 qemu_flush_or_purge_queued_packets(nc, false); 639 } 640 641 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 642 unsigned flags, 643 const uint8_t *buf, int size, 644 NetPacketSent *sent_cb) 645 { 646 NetQueue *queue; 647 int ret; 648 649 #ifdef DEBUG_NET 650 printf("qemu_send_packet_async:\n"); 651 qemu_hexdump(stdout, "net", buf, size); 652 #endif 653 654 if (sender->link_down || !sender->peer) { 655 return size; 656 } 657 658 /* Let filters handle the packet first */ 659 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 660 sender, flags, buf, size, sent_cb); 661 if (ret) { 662 return ret; 663 } 664 665 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 666 sender, flags, buf, size, sent_cb); 667 if (ret) { 668 return ret; 669 } 670 671 queue = sender->peer->incoming_queue; 672 673 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 674 } 675 676 ssize_t qemu_send_packet_async(NetClientState *sender, 677 const uint8_t *buf, int size, 678 NetPacketSent *sent_cb) 679 { 680 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 681 buf, size, sent_cb); 682 } 683 684 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 685 { 686 return qemu_send_packet_async(nc, buf, size, NULL); 687 } 688 689 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 690 { 691 if (!qemu_can_receive_packet(nc)) { 692 return 0; 693 } 694 695 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 696 } 697 698 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 699 int iovcnt) 700 { 701 if (!qemu_can_receive_packet(nc)) { 702 return 0; 703 } 704 705 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 706 } 707 708 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 709 { 710 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 711 buf, size, NULL); 712 } 713 714 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 715 int iovcnt, unsigned flags) 716 { 717 uint8_t *buf = NULL; 718 uint8_t *buffer; 719 size_t offset; 720 ssize_t ret; 721 722 if (iovcnt == 1) { 723 buffer = iov[0].iov_base; 724 offset = iov[0].iov_len; 725 } else { 726 offset = iov_size(iov, iovcnt); 727 if (offset > NET_BUFSIZE) { 728 return -1; 729 } 730 buf = g_malloc(offset); 731 buffer = buf; 732 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 733 } 734 735 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 736 ret = nc->info->receive_raw(nc, buffer, offset); 737 } else { 738 ret = nc->info->receive(nc, buffer, offset); 739 } 740 741 g_free(buf); 742 return ret; 743 } 744 745 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 746 unsigned flags, 747 const struct iovec *iov, 748 int iovcnt, 749 void *opaque) 750 { 751 NetClientState *nc = opaque; 752 int ret; 753 754 755 if (nc->link_down) { 756 return iov_size(iov, iovcnt); 757 } 758 759 if (nc->receive_disabled) { 760 return 0; 761 } 762 763 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 764 ret = nc->info->receive_iov(nc, iov, iovcnt); 765 } else { 766 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 767 } 768 769 if (ret == 0) { 770 nc->receive_disabled = 1; 771 } 772 773 return ret; 774 } 775 776 ssize_t qemu_sendv_packet_async(NetClientState *sender, 777 const struct iovec *iov, int iovcnt, 778 NetPacketSent *sent_cb) 779 { 780 NetQueue *queue; 781 size_t size = iov_size(iov, iovcnt); 782 int ret; 783 784 if (size > NET_BUFSIZE) { 785 return size; 786 } 787 788 if (sender->link_down || !sender->peer) { 789 return size; 790 } 791 792 /* Let filters handle the packet first */ 793 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 794 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 795 if (ret) { 796 return ret; 797 } 798 799 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 800 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 801 if (ret) { 802 return ret; 803 } 804 805 queue = sender->peer->incoming_queue; 806 807 return qemu_net_queue_send_iov(queue, sender, 808 QEMU_NET_PACKET_FLAG_NONE, 809 iov, iovcnt, sent_cb); 810 } 811 812 ssize_t 813 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 814 { 815 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 816 } 817 818 NetClientState *qemu_find_netdev(const char *id) 819 { 820 NetClientState *nc; 821 822 QTAILQ_FOREACH(nc, &net_clients, next) { 823 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 824 continue; 825 if (!strcmp(nc->name, id)) { 826 return nc; 827 } 828 } 829 830 return NULL; 831 } 832 833 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 834 NetClientDriver type, int max) 835 { 836 NetClientState *nc; 837 int ret = 0; 838 839 QTAILQ_FOREACH(nc, &net_clients, next) { 840 if (nc->info->type == type) { 841 continue; 842 } 843 if (!id || !strcmp(nc->name, id)) { 844 if (ret < max) { 845 ncs[ret] = nc; 846 } 847 ret++; 848 } 849 } 850 851 return ret; 852 } 853 854 static int nic_get_free_idx(void) 855 { 856 int index; 857 858 for (index = 0; index < MAX_NICS; index++) 859 if (!nd_table[index].used) 860 return index; 861 return -1; 862 } 863 864 int qemu_show_nic_models(const char *arg, const char *const *models) 865 { 866 int i; 867 868 if (!arg || !is_help_option(arg)) { 869 return 0; 870 } 871 872 printf("Supported NIC models:\n"); 873 for (i = 0 ; models[i]; i++) { 874 printf("%s\n", models[i]); 875 } 876 return 1; 877 } 878 879 void qemu_check_nic_model(NICInfo *nd, const char *model) 880 { 881 const char *models[2]; 882 883 models[0] = model; 884 models[1] = NULL; 885 886 if (qemu_show_nic_models(nd->model, models)) 887 exit(0); 888 if (qemu_find_nic_model(nd, models, model) < 0) 889 exit(1); 890 } 891 892 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 893 const char *default_model) 894 { 895 int i; 896 897 if (!nd->model) 898 nd->model = g_strdup(default_model); 899 900 for (i = 0 ; models[i]; i++) { 901 if (strcmp(nd->model, models[i]) == 0) 902 return i; 903 } 904 905 error_report("Unsupported NIC model: %s", nd->model); 906 return -1; 907 } 908 909 static int net_init_nic(const Netdev *netdev, const char *name, 910 NetClientState *peer, Error **errp) 911 { 912 int idx; 913 NICInfo *nd; 914 const NetLegacyNicOptions *nic; 915 916 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 917 nic = &netdev->u.nic; 918 919 idx = nic_get_free_idx(); 920 if (idx == -1 || nb_nics >= MAX_NICS) { 921 error_setg(errp, "too many NICs"); 922 return -1; 923 } 924 925 nd = &nd_table[idx]; 926 927 memset(nd, 0, sizeof(*nd)); 928 929 if (nic->has_netdev) { 930 nd->netdev = qemu_find_netdev(nic->netdev); 931 if (!nd->netdev) { 932 error_setg(errp, "netdev '%s' not found", nic->netdev); 933 return -1; 934 } 935 } else { 936 assert(peer); 937 nd->netdev = peer; 938 } 939 nd->name = g_strdup(name); 940 if (nic->has_model) { 941 nd->model = g_strdup(nic->model); 942 } 943 if (nic->has_addr) { 944 nd->devaddr = g_strdup(nic->addr); 945 } 946 947 if (nic->has_macaddr && 948 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 949 error_setg(errp, "invalid syntax for ethernet address"); 950 return -1; 951 } 952 if (nic->has_macaddr && 953 is_multicast_ether_addr(nd->macaddr.a)) { 954 error_setg(errp, 955 "NIC cannot have multicast MAC address (odd 1st byte)"); 956 return -1; 957 } 958 qemu_macaddr_default_if_unset(&nd->macaddr); 959 960 if (nic->has_vectors) { 961 if (nic->vectors > 0x7ffffff) { 962 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 963 return -1; 964 } 965 nd->nvectors = nic->vectors; 966 } else { 967 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 968 } 969 970 nd->used = 1; 971 nb_nics++; 972 973 return idx; 974 } 975 976 977 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 978 const Netdev *netdev, 979 const char *name, 980 NetClientState *peer, Error **errp) = { 981 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 982 #ifdef CONFIG_SLIRP 983 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 984 #endif 985 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 986 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 987 #ifdef CONFIG_VDE 988 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 989 #endif 990 #ifdef CONFIG_NETMAP 991 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 992 #endif 993 #ifdef CONFIG_NET_BRIDGE 994 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 995 #endif 996 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 997 #ifdef CONFIG_VHOST_NET_USER 998 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 999 #endif 1000 #ifdef CONFIG_VHOST_NET_VDPA 1001 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1002 #endif 1003 #ifdef CONFIG_L2TPV3 1004 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1005 #endif 1006 }; 1007 1008 1009 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1010 { 1011 NetClientState *peer = NULL; 1012 NetClientState *nc; 1013 1014 if (is_netdev) { 1015 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1016 !net_client_init_fun[netdev->type]) { 1017 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1018 "a netdev backend type"); 1019 return -1; 1020 } 1021 } else { 1022 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1023 return 0; /* nothing to do */ 1024 } 1025 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 1026 !net_client_init_fun[netdev->type]) { 1027 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1028 "a net backend type (maybe it is not compiled " 1029 "into this binary)"); 1030 return -1; 1031 } 1032 1033 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1034 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1035 !netdev->u.nic.has_netdev) { 1036 peer = net_hub_add_port(0, NULL, NULL); 1037 } 1038 } 1039 1040 nc = qemu_find_netdev(netdev->id); 1041 if (nc) { 1042 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1043 return -1; 1044 } 1045 1046 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1047 /* FIXME drop when all init functions store an Error */ 1048 if (errp && !*errp) { 1049 error_setg(errp, "Device '%s' could not be initialized", 1050 NetClientDriver_str(netdev->type)); 1051 } 1052 return -1; 1053 } 1054 1055 if (is_netdev) { 1056 nc = qemu_find_netdev(netdev->id); 1057 assert(nc); 1058 nc->is_netdev = true; 1059 } 1060 1061 return 0; 1062 } 1063 1064 void show_netdevs(void) 1065 { 1066 int idx; 1067 const char *available_netdevs[] = { 1068 "socket", 1069 "hubport", 1070 "tap", 1071 #ifdef CONFIG_SLIRP 1072 "user", 1073 #endif 1074 #ifdef CONFIG_L2TPV3 1075 "l2tpv3", 1076 #endif 1077 #ifdef CONFIG_VDE 1078 "vde", 1079 #endif 1080 #ifdef CONFIG_NET_BRIDGE 1081 "bridge", 1082 #endif 1083 #ifdef CONFIG_NETMAP 1084 "netmap", 1085 #endif 1086 #ifdef CONFIG_POSIX 1087 "vhost-user", 1088 #endif 1089 #ifdef CONFIG_VHOST_VDPA 1090 "vhost-vdpa", 1091 #endif 1092 }; 1093 1094 qemu_printf("Available netdev backend types:\n"); 1095 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1096 qemu_printf("%s\n", available_netdevs[idx]); 1097 } 1098 } 1099 1100 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1101 { 1102 gchar **substrings = NULL; 1103 Netdev *object = NULL; 1104 int ret = -1; 1105 Visitor *v = opts_visitor_new(opts); 1106 1107 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1108 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1109 1110 if (ip6_net) { 1111 char *prefix_addr; 1112 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1113 1114 substrings = g_strsplit(ip6_net, "/", 2); 1115 if (!substrings || !substrings[0]) { 1116 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1117 "a valid IPv6 prefix"); 1118 goto out; 1119 } 1120 1121 prefix_addr = substrings[0]; 1122 1123 /* Handle user-specified prefix length. */ 1124 if (substrings[1] && 1125 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1126 { 1127 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1128 "ipv6-prefixlen", "a number"); 1129 goto out; 1130 } 1131 1132 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1133 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1134 &error_abort); 1135 qemu_opt_unset(opts, "ipv6-net"); 1136 } 1137 1138 /* Create an ID for -net if the user did not specify one */ 1139 if (!is_netdev && !qemu_opts_id(opts)) { 1140 qemu_opts_set_id(opts, id_generate(ID_NET)); 1141 } 1142 1143 if (visit_type_Netdev(v, NULL, &object, errp)) { 1144 ret = net_client_init1(object, is_netdev, errp); 1145 } 1146 1147 qapi_free_Netdev(object); 1148 1149 out: 1150 g_strfreev(substrings); 1151 visit_free(v); 1152 return ret; 1153 } 1154 1155 void netdev_add(QemuOpts *opts, Error **errp) 1156 { 1157 net_client_init(opts, true, errp); 1158 } 1159 1160 void qmp_netdev_add(Netdev *netdev, Error **errp) 1161 { 1162 if (!id_wellformed(netdev->id)) { 1163 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1164 return; 1165 } 1166 1167 net_client_init1(netdev, true, errp); 1168 } 1169 1170 void qmp_netdev_del(const char *id, Error **errp) 1171 { 1172 NetClientState *nc; 1173 QemuOpts *opts; 1174 1175 nc = qemu_find_netdev(id); 1176 if (!nc) { 1177 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1178 "Device '%s' not found", id); 1179 return; 1180 } 1181 1182 if (!nc->is_netdev) { 1183 error_setg(errp, "Device '%s' is not a netdev", id); 1184 return; 1185 } 1186 1187 qemu_del_net_client(nc); 1188 1189 /* 1190 * Wart: we need to delete the QemuOpts associated with netdevs 1191 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1192 * HMP netdev_add. 1193 */ 1194 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1195 if (opts) { 1196 qemu_opts_del(opts); 1197 } 1198 } 1199 1200 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1201 { 1202 char *str; 1203 ObjectProperty *prop; 1204 ObjectPropertyIterator iter; 1205 Visitor *v; 1206 1207 /* generate info str */ 1208 object_property_iter_init(&iter, OBJECT(nf)); 1209 while ((prop = object_property_iter_next(&iter))) { 1210 if (!strcmp(prop->name, "type")) { 1211 continue; 1212 } 1213 v = string_output_visitor_new(false, &str); 1214 object_property_get(OBJECT(nf), prop->name, v, NULL); 1215 visit_complete(v, &str); 1216 visit_free(v); 1217 monitor_printf(mon, ",%s=%s", prop->name, str); 1218 g_free(str); 1219 } 1220 monitor_printf(mon, "\n"); 1221 } 1222 1223 void print_net_client(Monitor *mon, NetClientState *nc) 1224 { 1225 NetFilterState *nf; 1226 1227 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1228 nc->queue_index, 1229 NetClientDriver_str(nc->info->type), 1230 nc->info_str); 1231 if (!QTAILQ_EMPTY(&nc->filters)) { 1232 monitor_printf(mon, "filters:\n"); 1233 } 1234 QTAILQ_FOREACH(nf, &nc->filters, next) { 1235 monitor_printf(mon, " - %s: type=%s", 1236 object_get_canonical_path_component(OBJECT(nf)), 1237 object_get_typename(OBJECT(nf))); 1238 netfilter_print_info(mon, nf); 1239 } 1240 } 1241 1242 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1243 Error **errp) 1244 { 1245 NetClientState *nc; 1246 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1247 1248 QTAILQ_FOREACH(nc, &net_clients, next) { 1249 RxFilterInfo *info; 1250 1251 if (has_name && strcmp(nc->name, name) != 0) { 1252 continue; 1253 } 1254 1255 /* only query rx-filter information of NIC */ 1256 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1257 if (has_name) { 1258 error_setg(errp, "net client(%s) isn't a NIC", name); 1259 assert(!filter_list); 1260 return NULL; 1261 } 1262 continue; 1263 } 1264 1265 /* only query information on queue 0 since the info is per nic, 1266 * not per queue 1267 */ 1268 if (nc->queue_index != 0) 1269 continue; 1270 1271 if (nc->info->query_rx_filter) { 1272 info = nc->info->query_rx_filter(nc); 1273 QAPI_LIST_APPEND(tail, info); 1274 } else if (has_name) { 1275 error_setg(errp, "net client(%s) doesn't support" 1276 " rx-filter querying", name); 1277 assert(!filter_list); 1278 return NULL; 1279 } 1280 1281 if (has_name) { 1282 break; 1283 } 1284 } 1285 1286 if (filter_list == NULL && has_name) { 1287 error_setg(errp, "invalid net client name: %s", name); 1288 } 1289 1290 return filter_list; 1291 } 1292 1293 void hmp_info_network(Monitor *mon, const QDict *qdict) 1294 { 1295 NetClientState *nc, *peer; 1296 NetClientDriver type; 1297 1298 net_hub_info(mon); 1299 1300 QTAILQ_FOREACH(nc, &net_clients, next) { 1301 peer = nc->peer; 1302 type = nc->info->type; 1303 1304 /* Skip if already printed in hub info */ 1305 if (net_hub_id_for_client(nc, NULL) == 0) { 1306 continue; 1307 } 1308 1309 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1310 print_net_client(mon, nc); 1311 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1312 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1313 monitor_printf(mon, " \\ "); 1314 print_net_client(mon, peer); 1315 } 1316 } 1317 } 1318 1319 void colo_notify_filters_event(int event, Error **errp) 1320 { 1321 NetClientState *nc; 1322 NetFilterState *nf; 1323 NetFilterClass *nfc = NULL; 1324 Error *local_err = NULL; 1325 1326 QTAILQ_FOREACH(nc, &net_clients, next) { 1327 QTAILQ_FOREACH(nf, &nc->filters, next) { 1328 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1329 nfc->handle_event(nf, event, &local_err); 1330 if (local_err) { 1331 error_propagate(errp, local_err); 1332 return; 1333 } 1334 } 1335 } 1336 } 1337 1338 void qmp_set_link(const char *name, bool up, Error **errp) 1339 { 1340 NetClientState *ncs[MAX_QUEUE_NUM]; 1341 NetClientState *nc; 1342 int queues, i; 1343 1344 queues = qemu_find_net_clients_except(name, ncs, 1345 NET_CLIENT_DRIVER__MAX, 1346 MAX_QUEUE_NUM); 1347 1348 if (queues == 0) { 1349 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1350 "Device '%s' not found", name); 1351 return; 1352 } 1353 nc = ncs[0]; 1354 1355 for (i = 0; i < queues; i++) { 1356 ncs[i]->link_down = !up; 1357 } 1358 1359 if (nc->info->link_status_changed) { 1360 nc->info->link_status_changed(nc); 1361 } 1362 1363 if (nc->peer) { 1364 /* Change peer link only if the peer is NIC and then notify peer. 1365 * If the peer is a HUBPORT or a backend, we do not change the 1366 * link status. 1367 * 1368 * This behavior is compatible with qemu hubs where there could be 1369 * multiple clients that can still communicate with each other in 1370 * disconnected mode. For now maintain this compatibility. 1371 */ 1372 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1373 for (i = 0; i < queues; i++) { 1374 ncs[i]->peer->link_down = !up; 1375 } 1376 } 1377 if (nc->peer->info->link_status_changed) { 1378 nc->peer->info->link_status_changed(nc->peer); 1379 } 1380 } 1381 } 1382 1383 static void net_vm_change_state_handler(void *opaque, bool running, 1384 RunState state) 1385 { 1386 NetClientState *nc; 1387 NetClientState *tmp; 1388 1389 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1390 if (running) { 1391 /* Flush queued packets and wake up backends. */ 1392 if (nc->peer && qemu_can_send_packet(nc)) { 1393 qemu_flush_queued_packets(nc->peer); 1394 } 1395 } else { 1396 /* Complete all queued packets, to guarantee we don't modify 1397 * state later when VM is not running. 1398 */ 1399 qemu_flush_or_purge_queued_packets(nc, true); 1400 } 1401 } 1402 } 1403 1404 void net_cleanup(void) 1405 { 1406 NetClientState *nc; 1407 1408 /*cleanup colo compare module for COLO*/ 1409 colo_compare_cleanup(); 1410 1411 /* We may del multiple entries during qemu_del_net_client(), 1412 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1413 */ 1414 while (!QTAILQ_EMPTY(&net_clients)) { 1415 nc = QTAILQ_FIRST(&net_clients); 1416 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1417 qemu_del_nic(qemu_get_nic(nc)); 1418 } else { 1419 qemu_del_net_client(nc); 1420 } 1421 } 1422 1423 qemu_del_vm_change_state_handler(net_change_state_entry); 1424 } 1425 1426 void net_check_clients(void) 1427 { 1428 NetClientState *nc; 1429 int i; 1430 1431 net_hub_check_clients(); 1432 1433 QTAILQ_FOREACH(nc, &net_clients, next) { 1434 if (!nc->peer) { 1435 warn_report("%s %s has no peer", 1436 nc->info->type == NET_CLIENT_DRIVER_NIC 1437 ? "nic" : "netdev", 1438 nc->name); 1439 } 1440 } 1441 1442 /* Check that all NICs requested via -net nic actually got created. 1443 * NICs created via -device don't need to be checked here because 1444 * they are always instantiated. 1445 */ 1446 for (i = 0; i < MAX_NICS; i++) { 1447 NICInfo *nd = &nd_table[i]; 1448 if (nd->used && !nd->instantiated) { 1449 warn_report("requested NIC (%s, model %s) " 1450 "was not created (not supported by this machine?)", 1451 nd->name ? nd->name : "anonymous", 1452 nd->model ? nd->model : "unspecified"); 1453 } 1454 } 1455 } 1456 1457 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1458 { 1459 return net_client_init(opts, false, errp); 1460 } 1461 1462 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1463 { 1464 const char *type = qemu_opt_get(opts, "type"); 1465 1466 if (type && is_help_option(type)) { 1467 show_netdevs(); 1468 exit(0); 1469 } 1470 return net_client_init(opts, true, errp); 1471 } 1472 1473 /* For the convenience "--nic" parameter */ 1474 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1475 { 1476 char *mac, *nd_id; 1477 int idx, ret; 1478 NICInfo *ni; 1479 const char *type; 1480 1481 type = qemu_opt_get(opts, "type"); 1482 if (type && g_str_equal(type, "none")) { 1483 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1484 } 1485 1486 idx = nic_get_free_idx(); 1487 if (idx == -1 || nb_nics >= MAX_NICS) { 1488 error_setg(errp, "no more on-board/default NIC slots available"); 1489 return -1; 1490 } 1491 1492 if (!type) { 1493 qemu_opt_set(opts, "type", "user", &error_abort); 1494 } 1495 1496 ni = &nd_table[idx]; 1497 memset(ni, 0, sizeof(*ni)); 1498 ni->model = qemu_opt_get_del(opts, "model"); 1499 1500 /* Create an ID if the user did not specify one */ 1501 nd_id = g_strdup(qemu_opts_id(opts)); 1502 if (!nd_id) { 1503 nd_id = id_generate(ID_NET); 1504 qemu_opts_set_id(opts, nd_id); 1505 } 1506 1507 /* Handle MAC address */ 1508 mac = qemu_opt_get_del(opts, "mac"); 1509 if (mac) { 1510 ret = net_parse_macaddr(ni->macaddr.a, mac); 1511 g_free(mac); 1512 if (ret) { 1513 error_setg(errp, "invalid syntax for ethernet address"); 1514 goto out; 1515 } 1516 if (is_multicast_ether_addr(ni->macaddr.a)) { 1517 error_setg(errp, "NIC cannot have multicast MAC address"); 1518 ret = -1; 1519 goto out; 1520 } 1521 } 1522 qemu_macaddr_default_if_unset(&ni->macaddr); 1523 1524 ret = net_client_init(opts, true, errp); 1525 if (ret == 0) { 1526 ni->netdev = qemu_find_netdev(nd_id); 1527 ni->used = true; 1528 nb_nics++; 1529 } 1530 1531 out: 1532 g_free(nd_id); 1533 return ret; 1534 } 1535 1536 int net_init_clients(Error **errp) 1537 { 1538 net_change_state_entry = 1539 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1540 1541 QTAILQ_INIT(&net_clients); 1542 1543 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1544 net_init_netdev, NULL, errp)) { 1545 return -1; 1546 } 1547 1548 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1549 return -1; 1550 } 1551 1552 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1553 return -1; 1554 } 1555 1556 return 0; 1557 } 1558 1559 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 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 uint32_t net_crc32(const uint8_t *p, int len) 1571 { 1572 uint32_t crc; 1573 int carry, i, j; 1574 uint8_t b; 1575 1576 crc = 0xffffffff; 1577 for (i = 0; i < len; i++) { 1578 b = *p++; 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_BE) | carry); 1585 } 1586 } 1587 } 1588 1589 return crc; 1590 } 1591 1592 uint32_t net_crc32_le(const uint8_t *p, int len) 1593 { 1594 uint32_t crc; 1595 int carry, i, j; 1596 uint8_t b; 1597 1598 crc = 0xffffffff; 1599 for (i = 0; i < len; i++) { 1600 b = *p++; 1601 for (j = 0; j < 8; j++) { 1602 carry = (crc & 0x1) ^ (b & 0x01); 1603 crc >>= 1; 1604 b >>= 1; 1605 if (carry) { 1606 crc ^= POLYNOMIAL_LE; 1607 } 1608 } 1609 } 1610 1611 return crc; 1612 } 1613 1614 QemuOptsList qemu_netdev_opts = { 1615 .name = "netdev", 1616 .implied_opt_name = "type", 1617 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1618 .desc = { 1619 /* 1620 * no elements => accept any params 1621 * validation will happen later 1622 */ 1623 { /* end of list */ } 1624 }, 1625 }; 1626 1627 QemuOptsList qemu_nic_opts = { 1628 .name = "nic", 1629 .implied_opt_name = "type", 1630 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1631 .desc = { 1632 /* 1633 * no elements => accept any params 1634 * validation will happen later 1635 */ 1636 { /* end of list */ } 1637 }, 1638 }; 1639 1640 QemuOptsList qemu_net_opts = { 1641 .name = "net", 1642 .implied_opt_name = "type", 1643 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1644 .desc = { 1645 /* 1646 * no elements => accept any params 1647 * validation will happen later 1648 */ 1649 { /* end of list */ } 1650 }, 1651 }; 1652 1653 void net_socket_rs_init(SocketReadState *rs, 1654 SocketReadStateFinalize *finalize, 1655 bool vnet_hdr) 1656 { 1657 rs->state = 0; 1658 rs->vnet_hdr = vnet_hdr; 1659 rs->index = 0; 1660 rs->packet_len = 0; 1661 rs->vnet_hdr_len = 0; 1662 memset(rs->buf, 0, sizeof(rs->buf)); 1663 rs->finalize = finalize; 1664 } 1665 1666 /* 1667 * Returns 1668 * 0: success 1669 * -1: error occurs 1670 */ 1671 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1672 { 1673 unsigned int l; 1674 1675 while (size > 0) { 1676 /* Reassemble a packet from the network. 1677 * 0 = getting length. 1678 * 1 = getting vnet header length. 1679 * 2 = getting data. 1680 */ 1681 switch (rs->state) { 1682 case 0: 1683 l = 4 - rs->index; 1684 if (l > size) { 1685 l = size; 1686 } 1687 memcpy(rs->buf + rs->index, buf, l); 1688 buf += l; 1689 size -= l; 1690 rs->index += l; 1691 if (rs->index == 4) { 1692 /* got length */ 1693 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1694 rs->index = 0; 1695 if (rs->vnet_hdr) { 1696 rs->state = 1; 1697 } else { 1698 rs->state = 2; 1699 rs->vnet_hdr_len = 0; 1700 } 1701 } 1702 break; 1703 case 1: 1704 l = 4 - rs->index; 1705 if (l > size) { 1706 l = size; 1707 } 1708 memcpy(rs->buf + rs->index, buf, l); 1709 buf += l; 1710 size -= l; 1711 rs->index += l; 1712 if (rs->index == 4) { 1713 /* got vnet header length */ 1714 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1715 rs->index = 0; 1716 rs->state = 2; 1717 } 1718 break; 1719 case 2: 1720 l = rs->packet_len - rs->index; 1721 if (l > size) { 1722 l = size; 1723 } 1724 if (rs->index + l <= sizeof(rs->buf)) { 1725 memcpy(rs->buf + rs->index, buf, l); 1726 } else { 1727 fprintf(stderr, "serious error: oversized packet received," 1728 "connection terminated.\n"); 1729 rs->index = rs->state = 0; 1730 return -1; 1731 } 1732 1733 rs->index += l; 1734 buf += l; 1735 size -= l; 1736 if (rs->index >= rs->packet_len) { 1737 rs->index = 0; 1738 rs->state = 0; 1739 assert(rs->finalize); 1740 rs->finalize(rs); 1741 } 1742 break; 1743 } 1744 } 1745 1746 assert(size == 0); 1747 return 0; 1748 } 1749