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 substrings = g_strsplit(str, ":", 2); 79 if (!substrings || !substrings[0] || !substrings[1]) { 80 error_setg(errp, "host address '%s' doesn't contain ':' " 81 "separating host from port", str); 82 ret = -1; 83 goto out; 84 } 85 86 addr = substrings[0]; 87 p = substrings[1]; 88 89 saddr->sin_family = AF_INET; 90 if (addr[0] == '\0') { 91 saddr->sin_addr.s_addr = 0; 92 } else { 93 if (qemu_isdigit(addr[0])) { 94 if (!inet_aton(addr, &saddr->sin_addr)) { 95 error_setg(errp, "host address '%s' is not a valid " 96 "IPv4 address", addr); 97 ret = -1; 98 goto out; 99 } 100 } else { 101 he = gethostbyname(addr); 102 if (he == NULL) { 103 error_setg(errp, "can't resolve host address '%s'", addr); 104 ret = -1; 105 goto out; 106 } 107 saddr->sin_addr = *(struct in_addr *)he->h_addr; 108 } 109 } 110 port = strtol(p, (char **)&r, 0); 111 if (r == p) { 112 error_setg(errp, "port number '%s' is invalid", p); 113 ret = -1; 114 goto out; 115 } 116 saddr->sin_port = htons(port); 117 118 out: 119 g_strfreev(substrings); 120 return ret; 121 } 122 123 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 124 { 125 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 126 macaddr[0], macaddr[1], macaddr[2], 127 macaddr[3], macaddr[4], macaddr[5]); 128 } 129 130 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 131 { 132 snprintf(nc->info_str, sizeof(nc->info_str), 133 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 134 nc->model, 135 macaddr[0], macaddr[1], macaddr[2], 136 macaddr[3], macaddr[4], macaddr[5]); 137 } 138 139 static int mac_table[256] = {0}; 140 141 static void qemu_macaddr_set_used(MACAddr *macaddr) 142 { 143 int index; 144 145 for (index = 0x56; index < 0xFF; index++) { 146 if (macaddr->a[5] == index) { 147 mac_table[index]++; 148 } 149 } 150 } 151 152 static void qemu_macaddr_set_free(MACAddr *macaddr) 153 { 154 int index; 155 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 156 157 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 158 return; 159 } 160 for (index = 0x56; index < 0xFF; index++) { 161 if (macaddr->a[5] == index) { 162 mac_table[index]--; 163 } 164 } 165 } 166 167 static int qemu_macaddr_get_free(void) 168 { 169 int index; 170 171 for (index = 0x56; index < 0xFF; index++) { 172 if (mac_table[index] == 0) { 173 return index; 174 } 175 } 176 177 return -1; 178 } 179 180 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 181 { 182 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 183 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 184 185 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 186 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 187 return; 188 } else { 189 qemu_macaddr_set_used(macaddr); 190 return; 191 } 192 } 193 194 macaddr->a[0] = 0x52; 195 macaddr->a[1] = 0x54; 196 macaddr->a[2] = 0x00; 197 macaddr->a[3] = 0x12; 198 macaddr->a[4] = 0x34; 199 macaddr->a[5] = qemu_macaddr_get_free(); 200 qemu_macaddr_set_used(macaddr); 201 } 202 203 /** 204 * Generate a name for net client 205 * 206 * Only net clients created with the legacy -net option and NICs need this. 207 */ 208 static char *assign_name(NetClientState *nc1, const char *model) 209 { 210 NetClientState *nc; 211 int id = 0; 212 213 QTAILQ_FOREACH(nc, &net_clients, next) { 214 if (nc == nc1) { 215 continue; 216 } 217 if (strcmp(nc->model, model) == 0) { 218 id++; 219 } 220 } 221 222 return g_strdup_printf("%s.%d", model, id); 223 } 224 225 static void qemu_net_client_destructor(NetClientState *nc) 226 { 227 g_free(nc); 228 } 229 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 230 unsigned flags, 231 const struct iovec *iov, 232 int iovcnt, 233 void *opaque); 234 235 static void qemu_net_client_setup(NetClientState *nc, 236 NetClientInfo *info, 237 NetClientState *peer, 238 const char *model, 239 const char *name, 240 NetClientDestructor *destructor) 241 { 242 nc->info = info; 243 nc->model = g_strdup(model); 244 if (name) { 245 nc->name = g_strdup(name); 246 } else { 247 nc->name = assign_name(nc, model); 248 } 249 250 if (peer) { 251 assert(!peer->peer); 252 nc->peer = peer; 253 peer->peer = nc; 254 } 255 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 256 257 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 258 nc->destructor = destructor; 259 QTAILQ_INIT(&nc->filters); 260 } 261 262 NetClientState *qemu_new_net_client(NetClientInfo *info, 263 NetClientState *peer, 264 const char *model, 265 const char *name) 266 { 267 NetClientState *nc; 268 269 assert(info->size >= sizeof(NetClientState)); 270 271 nc = g_malloc0(info->size); 272 qemu_net_client_setup(nc, info, peer, model, name, 273 qemu_net_client_destructor); 274 275 return nc; 276 } 277 278 NICState *qemu_new_nic(NetClientInfo *info, 279 NICConf *conf, 280 const char *model, 281 const char *name, 282 void *opaque) 283 { 284 NetClientState **peers = conf->peers.ncs; 285 NICState *nic; 286 int i, queues = MAX(1, conf->peers.queues); 287 288 assert(info->type == NET_CLIENT_DRIVER_NIC); 289 assert(info->size >= sizeof(NICState)); 290 291 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 292 nic->ncs = (void *)nic + info->size; 293 nic->conf = conf; 294 nic->opaque = opaque; 295 296 for (i = 0; i < queues; i++) { 297 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 298 NULL); 299 nic->ncs[i].queue_index = i; 300 } 301 302 return nic; 303 } 304 305 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 306 { 307 return nic->ncs + queue_index; 308 } 309 310 NetClientState *qemu_get_queue(NICState *nic) 311 { 312 return qemu_get_subqueue(nic, 0); 313 } 314 315 NICState *qemu_get_nic(NetClientState *nc) 316 { 317 NetClientState *nc0 = nc - nc->queue_index; 318 319 return (NICState *)((void *)nc0 - nc->info->size); 320 } 321 322 void *qemu_get_nic_opaque(NetClientState *nc) 323 { 324 NICState *nic = qemu_get_nic(nc); 325 326 return nic->opaque; 327 } 328 329 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 330 { 331 assert(nc != NULL); 332 NetClientState *ncs = nc + queue_index; 333 return ncs->peer; 334 } 335 336 static void qemu_cleanup_net_client(NetClientState *nc) 337 { 338 QTAILQ_REMOVE(&net_clients, nc, next); 339 340 if (nc->info->cleanup) { 341 nc->info->cleanup(nc); 342 } 343 } 344 345 static void qemu_free_net_client(NetClientState *nc) 346 { 347 if (nc->incoming_queue) { 348 qemu_del_net_queue(nc->incoming_queue); 349 } 350 if (nc->peer) { 351 nc->peer->peer = NULL; 352 } 353 g_free(nc->name); 354 g_free(nc->model); 355 if (nc->destructor) { 356 nc->destructor(nc); 357 } 358 } 359 360 void qemu_del_net_client(NetClientState *nc) 361 { 362 NetClientState *ncs[MAX_QUEUE_NUM]; 363 int queues, i; 364 NetFilterState *nf, *next; 365 366 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 367 368 /* If the NetClientState belongs to a multiqueue backend, we will change all 369 * other NetClientStates also. 370 */ 371 queues = qemu_find_net_clients_except(nc->name, ncs, 372 NET_CLIENT_DRIVER_NIC, 373 MAX_QUEUE_NUM); 374 assert(queues != 0); 375 376 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 377 object_unparent(OBJECT(nf)); 378 } 379 380 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 381 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 382 NICState *nic = qemu_get_nic(nc->peer); 383 if (nic->peer_deleted) { 384 return; 385 } 386 nic->peer_deleted = true; 387 388 for (i = 0; i < queues; i++) { 389 ncs[i]->peer->link_down = true; 390 } 391 392 if (nc->peer->info->link_status_changed) { 393 nc->peer->info->link_status_changed(nc->peer); 394 } 395 396 for (i = 0; i < queues; i++) { 397 qemu_cleanup_net_client(ncs[i]); 398 } 399 400 return; 401 } 402 403 for (i = 0; i < queues; i++) { 404 qemu_cleanup_net_client(ncs[i]); 405 qemu_free_net_client(ncs[i]); 406 } 407 } 408 409 void qemu_del_nic(NICState *nic) 410 { 411 int i, queues = MAX(nic->conf->peers.queues, 1); 412 413 qemu_macaddr_set_free(&nic->conf->macaddr); 414 415 for (i = 0; i < queues; i++) { 416 NetClientState *nc = qemu_get_subqueue(nic, i); 417 /* If this is a peer NIC and peer has already been deleted, free it now. */ 418 if (nic->peer_deleted) { 419 qemu_free_net_client(nc->peer); 420 } else if (nc->peer) { 421 /* if there are RX packets pending, complete them */ 422 qemu_purge_queued_packets(nc->peer); 423 } 424 } 425 426 for (i = queues - 1; i >= 0; i--) { 427 NetClientState *nc = qemu_get_subqueue(nic, i); 428 429 qemu_cleanup_net_client(nc); 430 qemu_free_net_client(nc); 431 } 432 433 g_free(nic); 434 } 435 436 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 437 { 438 NetClientState *nc; 439 440 QTAILQ_FOREACH(nc, &net_clients, next) { 441 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 442 if (nc->queue_index == 0) { 443 func(qemu_get_nic(nc), opaque); 444 } 445 } 446 } 447 } 448 449 bool qemu_has_ufo(NetClientState *nc) 450 { 451 if (!nc || !nc->info->has_ufo) { 452 return false; 453 } 454 455 return nc->info->has_ufo(nc); 456 } 457 458 bool qemu_has_vnet_hdr(NetClientState *nc) 459 { 460 if (!nc || !nc->info->has_vnet_hdr) { 461 return false; 462 } 463 464 return nc->info->has_vnet_hdr(nc); 465 } 466 467 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 468 { 469 if (!nc || !nc->info->has_vnet_hdr_len) { 470 return false; 471 } 472 473 return nc->info->has_vnet_hdr_len(nc, len); 474 } 475 476 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 477 { 478 if (!nc || !nc->info->using_vnet_hdr) { 479 return; 480 } 481 482 nc->info->using_vnet_hdr(nc, enable); 483 } 484 485 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 486 int ecn, int ufo) 487 { 488 if (!nc || !nc->info->set_offload) { 489 return; 490 } 491 492 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 493 } 494 495 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 496 { 497 if (!nc || !nc->info->set_vnet_hdr_len) { 498 return; 499 } 500 501 nc->vnet_hdr_len = len; 502 nc->info->set_vnet_hdr_len(nc, len); 503 } 504 505 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 506 { 507 #ifdef HOST_WORDS_BIGENDIAN 508 if (!nc || !nc->info->set_vnet_le) { 509 return -ENOSYS; 510 } 511 512 return nc->info->set_vnet_le(nc, is_le); 513 #else 514 return 0; 515 #endif 516 } 517 518 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 519 { 520 #ifdef HOST_WORDS_BIGENDIAN 521 return 0; 522 #else 523 if (!nc || !nc->info->set_vnet_be) { 524 return -ENOSYS; 525 } 526 527 return nc->info->set_vnet_be(nc, is_be); 528 #endif 529 } 530 531 int qemu_can_receive_packet(NetClientState *nc) 532 { 533 if (nc->receive_disabled) { 534 return 0; 535 } else if (nc->info->can_receive && 536 !nc->info->can_receive(nc)) { 537 return 0; 538 } 539 return 1; 540 } 541 542 int qemu_can_send_packet(NetClientState *sender) 543 { 544 int vm_running = runstate_is_running(); 545 546 if (!vm_running) { 547 return 0; 548 } 549 550 if (!sender->peer) { 551 return 1; 552 } 553 554 return qemu_can_receive_packet(sender->peer); 555 } 556 557 static ssize_t filter_receive_iov(NetClientState *nc, 558 NetFilterDirection direction, 559 NetClientState *sender, 560 unsigned flags, 561 const struct iovec *iov, 562 int iovcnt, 563 NetPacketSent *sent_cb) 564 { 565 ssize_t ret = 0; 566 NetFilterState *nf = NULL; 567 568 if (direction == NET_FILTER_DIRECTION_TX) { 569 QTAILQ_FOREACH(nf, &nc->filters, next) { 570 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 571 iovcnt, sent_cb); 572 if (ret) { 573 return ret; 574 } 575 } 576 } else { 577 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 578 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 579 iovcnt, sent_cb); 580 if (ret) { 581 return ret; 582 } 583 } 584 } 585 586 return ret; 587 } 588 589 static ssize_t filter_receive(NetClientState *nc, 590 NetFilterDirection direction, 591 NetClientState *sender, 592 unsigned flags, 593 const uint8_t *data, 594 size_t size, 595 NetPacketSent *sent_cb) 596 { 597 struct iovec iov = { 598 .iov_base = (void *)data, 599 .iov_len = size 600 }; 601 602 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 603 } 604 605 void qemu_purge_queued_packets(NetClientState *nc) 606 { 607 if (!nc->peer) { 608 return; 609 } 610 611 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 612 } 613 614 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 615 { 616 nc->receive_disabled = 0; 617 618 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 619 if (net_hub_flush(nc->peer)) { 620 qemu_notify_event(); 621 } 622 } 623 if (qemu_net_queue_flush(nc->incoming_queue)) { 624 /* We emptied the queue successfully, signal to the IO thread to repoll 625 * the file descriptor (for tap, for example). 626 */ 627 qemu_notify_event(); 628 } else if (purge) { 629 /* Unable to empty the queue, purge remaining packets */ 630 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 631 } 632 } 633 634 void qemu_flush_queued_packets(NetClientState *nc) 635 { 636 qemu_flush_or_purge_queued_packets(nc, false); 637 } 638 639 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 640 unsigned flags, 641 const uint8_t *buf, int size, 642 NetPacketSent *sent_cb) 643 { 644 NetQueue *queue; 645 int ret; 646 647 #ifdef DEBUG_NET 648 printf("qemu_send_packet_async:\n"); 649 qemu_hexdump(stdout, "net", buf, size); 650 #endif 651 652 if (sender->link_down || !sender->peer) { 653 return size; 654 } 655 656 /* Let filters handle the packet first */ 657 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 658 sender, flags, buf, size, sent_cb); 659 if (ret) { 660 return ret; 661 } 662 663 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 664 sender, flags, buf, size, sent_cb); 665 if (ret) { 666 return ret; 667 } 668 669 queue = sender->peer->incoming_queue; 670 671 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 672 } 673 674 ssize_t qemu_send_packet_async(NetClientState *sender, 675 const uint8_t *buf, int size, 676 NetPacketSent *sent_cb) 677 { 678 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 679 buf, size, sent_cb); 680 } 681 682 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 683 { 684 return qemu_send_packet_async(nc, buf, size, NULL); 685 } 686 687 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 688 { 689 if (!qemu_can_receive_packet(nc)) { 690 return 0; 691 } 692 693 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 694 } 695 696 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 697 int iovcnt) 698 { 699 if (!qemu_can_receive_packet(nc)) { 700 return 0; 701 } 702 703 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 704 } 705 706 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 707 { 708 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 709 buf, size, NULL); 710 } 711 712 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 713 int iovcnt, unsigned flags) 714 { 715 uint8_t *buf = NULL; 716 uint8_t *buffer; 717 size_t offset; 718 ssize_t ret; 719 720 if (iovcnt == 1) { 721 buffer = iov[0].iov_base; 722 offset = iov[0].iov_len; 723 } else { 724 offset = iov_size(iov, iovcnt); 725 if (offset > NET_BUFSIZE) { 726 return -1; 727 } 728 buf = g_malloc(offset); 729 buffer = buf; 730 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 731 } 732 733 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 734 ret = nc->info->receive_raw(nc, buffer, offset); 735 } else { 736 ret = nc->info->receive(nc, buffer, offset); 737 } 738 739 g_free(buf); 740 return ret; 741 } 742 743 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 744 unsigned flags, 745 const struct iovec *iov, 746 int iovcnt, 747 void *opaque) 748 { 749 NetClientState *nc = opaque; 750 int ret; 751 752 753 if (nc->link_down) { 754 return iov_size(iov, iovcnt); 755 } 756 757 if (nc->receive_disabled) { 758 return 0; 759 } 760 761 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 762 ret = nc->info->receive_iov(nc, iov, iovcnt); 763 } else { 764 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 765 } 766 767 if (ret == 0) { 768 nc->receive_disabled = 1; 769 } 770 771 return ret; 772 } 773 774 ssize_t qemu_sendv_packet_async(NetClientState *sender, 775 const struct iovec *iov, int iovcnt, 776 NetPacketSent *sent_cb) 777 { 778 NetQueue *queue; 779 size_t size = iov_size(iov, iovcnt); 780 int ret; 781 782 if (size > NET_BUFSIZE) { 783 return size; 784 } 785 786 if (sender->link_down || !sender->peer) { 787 return size; 788 } 789 790 /* Let filters handle the packet first */ 791 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 792 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 793 if (ret) { 794 return ret; 795 } 796 797 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 798 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 799 if (ret) { 800 return ret; 801 } 802 803 queue = sender->peer->incoming_queue; 804 805 return qemu_net_queue_send_iov(queue, sender, 806 QEMU_NET_PACKET_FLAG_NONE, 807 iov, iovcnt, sent_cb); 808 } 809 810 ssize_t 811 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 812 { 813 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 814 } 815 816 NetClientState *qemu_find_netdev(const char *id) 817 { 818 NetClientState *nc; 819 820 QTAILQ_FOREACH(nc, &net_clients, next) { 821 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 822 continue; 823 if (!strcmp(nc->name, id)) { 824 return nc; 825 } 826 } 827 828 return NULL; 829 } 830 831 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 832 NetClientDriver type, int max) 833 { 834 NetClientState *nc; 835 int ret = 0; 836 837 QTAILQ_FOREACH(nc, &net_clients, next) { 838 if (nc->info->type == type) { 839 continue; 840 } 841 if (!id || !strcmp(nc->name, id)) { 842 if (ret < max) { 843 ncs[ret] = nc; 844 } 845 ret++; 846 } 847 } 848 849 return ret; 850 } 851 852 static int nic_get_free_idx(void) 853 { 854 int index; 855 856 for (index = 0; index < MAX_NICS; index++) 857 if (!nd_table[index].used) 858 return index; 859 return -1; 860 } 861 862 int qemu_show_nic_models(const char *arg, const char *const *models) 863 { 864 int i; 865 866 if (!arg || !is_help_option(arg)) { 867 return 0; 868 } 869 870 printf("Supported NIC models:\n"); 871 for (i = 0 ; models[i]; i++) { 872 printf("%s\n", models[i]); 873 } 874 return 1; 875 } 876 877 void qemu_check_nic_model(NICInfo *nd, const char *model) 878 { 879 const char *models[2]; 880 881 models[0] = model; 882 models[1] = NULL; 883 884 if (qemu_show_nic_models(nd->model, models)) 885 exit(0); 886 if (qemu_find_nic_model(nd, models, model) < 0) 887 exit(1); 888 } 889 890 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 891 const char *default_model) 892 { 893 int i; 894 895 if (!nd->model) 896 nd->model = g_strdup(default_model); 897 898 for (i = 0 ; models[i]; i++) { 899 if (strcmp(nd->model, models[i]) == 0) 900 return i; 901 } 902 903 error_report("Unsupported NIC model: %s", nd->model); 904 return -1; 905 } 906 907 static int net_init_nic(const Netdev *netdev, const char *name, 908 NetClientState *peer, Error **errp) 909 { 910 int idx; 911 NICInfo *nd; 912 const NetLegacyNicOptions *nic; 913 914 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 915 nic = &netdev->u.nic; 916 917 idx = nic_get_free_idx(); 918 if (idx == -1 || nb_nics >= MAX_NICS) { 919 error_setg(errp, "too many NICs"); 920 return -1; 921 } 922 923 nd = &nd_table[idx]; 924 925 memset(nd, 0, sizeof(*nd)); 926 927 if (nic->has_netdev) { 928 nd->netdev = qemu_find_netdev(nic->netdev); 929 if (!nd->netdev) { 930 error_setg(errp, "netdev '%s' not found", nic->netdev); 931 return -1; 932 } 933 } else { 934 assert(peer); 935 nd->netdev = peer; 936 } 937 nd->name = g_strdup(name); 938 if (nic->has_model) { 939 nd->model = g_strdup(nic->model); 940 } 941 if (nic->has_addr) { 942 nd->devaddr = g_strdup(nic->addr); 943 } 944 945 if (nic->has_macaddr && 946 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 947 error_setg(errp, "invalid syntax for ethernet address"); 948 return -1; 949 } 950 if (nic->has_macaddr && 951 is_multicast_ether_addr(nd->macaddr.a)) { 952 error_setg(errp, 953 "NIC cannot have multicast MAC address (odd 1st byte)"); 954 return -1; 955 } 956 qemu_macaddr_default_if_unset(&nd->macaddr); 957 958 if (nic->has_vectors) { 959 if (nic->vectors > 0x7ffffff) { 960 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 961 return -1; 962 } 963 nd->nvectors = nic->vectors; 964 } else { 965 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 966 } 967 968 nd->used = 1; 969 nb_nics++; 970 971 return idx; 972 } 973 974 975 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 976 const Netdev *netdev, 977 const char *name, 978 NetClientState *peer, Error **errp) = { 979 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 980 #ifdef CONFIG_SLIRP 981 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 982 #endif 983 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 984 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 985 #ifdef CONFIG_VDE 986 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 987 #endif 988 #ifdef CONFIG_NETMAP 989 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 990 #endif 991 #ifdef CONFIG_NET_BRIDGE 992 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 993 #endif 994 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 995 #ifdef CONFIG_VHOST_NET_USER 996 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 997 #endif 998 #ifdef CONFIG_VHOST_NET_VDPA 999 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1000 #endif 1001 #ifdef CONFIG_L2TPV3 1002 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1003 #endif 1004 }; 1005 1006 1007 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1008 { 1009 NetClientState *peer = NULL; 1010 NetClientState *nc; 1011 1012 if (is_netdev) { 1013 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1014 !net_client_init_fun[netdev->type]) { 1015 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1016 "a netdev backend type"); 1017 return -1; 1018 } 1019 } else { 1020 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1021 return 0; /* nothing to do */ 1022 } 1023 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 1024 !net_client_init_fun[netdev->type]) { 1025 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1026 "a net backend type (maybe it is not compiled " 1027 "into this binary)"); 1028 return -1; 1029 } 1030 1031 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1032 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1033 !netdev->u.nic.has_netdev) { 1034 peer = net_hub_add_port(0, NULL, NULL); 1035 } 1036 } 1037 1038 nc = qemu_find_netdev(netdev->id); 1039 if (nc) { 1040 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1041 return -1; 1042 } 1043 1044 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1045 /* FIXME drop when all init functions store an Error */ 1046 if (errp && !*errp) { 1047 error_setg(errp, "Device '%s' could not be initialized", 1048 NetClientDriver_str(netdev->type)); 1049 } 1050 return -1; 1051 } 1052 1053 if (is_netdev) { 1054 nc = qemu_find_netdev(netdev->id); 1055 assert(nc); 1056 nc->is_netdev = true; 1057 } 1058 1059 return 0; 1060 } 1061 1062 void show_netdevs(void) 1063 { 1064 int idx; 1065 const char *available_netdevs[] = { 1066 "socket", 1067 "hubport", 1068 "tap", 1069 #ifdef CONFIG_SLIRP 1070 "user", 1071 #endif 1072 #ifdef CONFIG_L2TPV3 1073 "l2tpv3", 1074 #endif 1075 #ifdef CONFIG_VDE 1076 "vde", 1077 #endif 1078 #ifdef CONFIG_NET_BRIDGE 1079 "bridge", 1080 #endif 1081 #ifdef CONFIG_NETMAP 1082 "netmap", 1083 #endif 1084 #ifdef CONFIG_POSIX 1085 "vhost-user", 1086 #endif 1087 #ifdef CONFIG_VHOST_VDPA 1088 "vhost-vdpa", 1089 #endif 1090 }; 1091 1092 qemu_printf("Available netdev backend types:\n"); 1093 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1094 qemu_printf("%s\n", available_netdevs[idx]); 1095 } 1096 } 1097 1098 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1099 { 1100 gchar **substrings = NULL; 1101 Netdev *object = NULL; 1102 int ret = -1; 1103 Visitor *v = opts_visitor_new(opts); 1104 1105 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1106 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1107 1108 if (ip6_net) { 1109 char *prefix_addr; 1110 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1111 1112 substrings = g_strsplit(ip6_net, "/", 2); 1113 if (!substrings || !substrings[0]) { 1114 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1115 "a valid IPv6 prefix"); 1116 goto out; 1117 } 1118 1119 prefix_addr = substrings[0]; 1120 1121 /* Handle user-specified prefix length. */ 1122 if (substrings[1] && 1123 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1124 { 1125 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1126 "ipv6-prefixlen", "a number"); 1127 goto out; 1128 } 1129 1130 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1131 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1132 &error_abort); 1133 qemu_opt_unset(opts, "ipv6-net"); 1134 } 1135 1136 /* Create an ID for -net if the user did not specify one */ 1137 if (!is_netdev && !qemu_opts_id(opts)) { 1138 qemu_opts_set_id(opts, id_generate(ID_NET)); 1139 } 1140 1141 if (visit_type_Netdev(v, NULL, &object, errp)) { 1142 ret = net_client_init1(object, is_netdev, errp); 1143 } 1144 1145 qapi_free_Netdev(object); 1146 1147 out: 1148 g_strfreev(substrings); 1149 visit_free(v); 1150 return ret; 1151 } 1152 1153 void netdev_add(QemuOpts *opts, Error **errp) 1154 { 1155 net_client_init(opts, true, errp); 1156 } 1157 1158 void qmp_netdev_add(Netdev *netdev, Error **errp) 1159 { 1160 if (!id_wellformed(netdev->id)) { 1161 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1162 return; 1163 } 1164 1165 net_client_init1(netdev, true, errp); 1166 } 1167 1168 void qmp_netdev_del(const char *id, Error **errp) 1169 { 1170 NetClientState *nc; 1171 QemuOpts *opts; 1172 1173 nc = qemu_find_netdev(id); 1174 if (!nc) { 1175 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1176 "Device '%s' not found", id); 1177 return; 1178 } 1179 1180 if (!nc->is_netdev) { 1181 error_setg(errp, "Device '%s' is not a netdev", id); 1182 return; 1183 } 1184 1185 qemu_del_net_client(nc); 1186 1187 /* 1188 * Wart: we need to delete the QemuOpts associated with netdevs 1189 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1190 * HMP netdev_add. 1191 */ 1192 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1193 if (opts) { 1194 qemu_opts_del(opts); 1195 } 1196 } 1197 1198 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1199 { 1200 char *str; 1201 ObjectProperty *prop; 1202 ObjectPropertyIterator iter; 1203 Visitor *v; 1204 1205 /* generate info str */ 1206 object_property_iter_init(&iter, OBJECT(nf)); 1207 while ((prop = object_property_iter_next(&iter))) { 1208 if (!strcmp(prop->name, "type")) { 1209 continue; 1210 } 1211 v = string_output_visitor_new(false, &str); 1212 object_property_get(OBJECT(nf), prop->name, v, NULL); 1213 visit_complete(v, &str); 1214 visit_free(v); 1215 monitor_printf(mon, ",%s=%s", prop->name, str); 1216 g_free(str); 1217 } 1218 monitor_printf(mon, "\n"); 1219 } 1220 1221 void print_net_client(Monitor *mon, NetClientState *nc) 1222 { 1223 NetFilterState *nf; 1224 1225 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1226 nc->queue_index, 1227 NetClientDriver_str(nc->info->type), 1228 nc->info_str); 1229 if (!QTAILQ_EMPTY(&nc->filters)) { 1230 monitor_printf(mon, "filters:\n"); 1231 } 1232 QTAILQ_FOREACH(nf, &nc->filters, next) { 1233 monitor_printf(mon, " - %s: type=%s", 1234 object_get_canonical_path_component(OBJECT(nf)), 1235 object_get_typename(OBJECT(nf))); 1236 netfilter_print_info(mon, nf); 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, **tail = &filter_list; 1245 1246 QTAILQ_FOREACH(nc, &net_clients, next) { 1247 RxFilterInfo *info; 1248 1249 if (has_name && strcmp(nc->name, name) != 0) { 1250 continue; 1251 } 1252 1253 /* only query rx-filter information of NIC */ 1254 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1255 if (has_name) { 1256 error_setg(errp, "net client(%s) isn't a NIC", name); 1257 assert(!filter_list); 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 QAPI_LIST_APPEND(tail, info); 1272 } else if (has_name) { 1273 error_setg(errp, "net client(%s) doesn't support" 1274 " rx-filter querying", name); 1275 assert(!filter_list); 1276 return NULL; 1277 } 1278 1279 if (has_name) { 1280 break; 1281 } 1282 } 1283 1284 if (filter_list == NULL && has_name) { 1285 error_setg(errp, "invalid net client name: %s", name); 1286 } 1287 1288 return filter_list; 1289 } 1290 1291 void hmp_info_network(Monitor *mon, const QDict *qdict) 1292 { 1293 NetClientState *nc, *peer; 1294 NetClientDriver type; 1295 1296 net_hub_info(mon); 1297 1298 QTAILQ_FOREACH(nc, &net_clients, next) { 1299 peer = nc->peer; 1300 type = nc->info->type; 1301 1302 /* Skip if already printed in hub info */ 1303 if (net_hub_id_for_client(nc, NULL) == 0) { 1304 continue; 1305 } 1306 1307 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1308 print_net_client(mon, nc); 1309 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1310 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1311 monitor_printf(mon, " \\ "); 1312 print_net_client(mon, peer); 1313 } 1314 } 1315 } 1316 1317 void colo_notify_filters_event(int event, Error **errp) 1318 { 1319 NetClientState *nc; 1320 NetFilterState *nf; 1321 NetFilterClass *nfc = NULL; 1322 Error *local_err = NULL; 1323 1324 QTAILQ_FOREACH(nc, &net_clients, next) { 1325 QTAILQ_FOREACH(nf, &nc->filters, next) { 1326 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1327 nfc->handle_event(nf, event, &local_err); 1328 if (local_err) { 1329 error_propagate(errp, local_err); 1330 return; 1331 } 1332 } 1333 } 1334 } 1335 1336 void qmp_set_link(const char *name, bool up, Error **errp) 1337 { 1338 NetClientState *ncs[MAX_QUEUE_NUM]; 1339 NetClientState *nc; 1340 int queues, i; 1341 1342 queues = qemu_find_net_clients_except(name, ncs, 1343 NET_CLIENT_DRIVER__MAX, 1344 MAX_QUEUE_NUM); 1345 1346 if (queues == 0) { 1347 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1348 "Device '%s' not found", name); 1349 return; 1350 } 1351 nc = ncs[0]; 1352 1353 for (i = 0; i < queues; i++) { 1354 ncs[i]->link_down = !up; 1355 } 1356 1357 if (nc->info->link_status_changed) { 1358 nc->info->link_status_changed(nc); 1359 } 1360 1361 if (nc->peer) { 1362 /* Change peer link only if the peer is NIC and then notify peer. 1363 * If the peer is a HUBPORT or a backend, we do not change the 1364 * link status. 1365 * 1366 * This behavior is compatible with qemu hubs where there could be 1367 * multiple clients that can still communicate with each other in 1368 * disconnected mode. For now maintain this compatibility. 1369 */ 1370 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1371 for (i = 0; i < queues; i++) { 1372 ncs[i]->peer->link_down = !up; 1373 } 1374 } 1375 if (nc->peer->info->link_status_changed) { 1376 nc->peer->info->link_status_changed(nc->peer); 1377 } 1378 } 1379 } 1380 1381 static void net_vm_change_state_handler(void *opaque, bool running, 1382 RunState state) 1383 { 1384 NetClientState *nc; 1385 NetClientState *tmp; 1386 1387 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1388 if (running) { 1389 /* Flush queued packets and wake up backends. */ 1390 if (nc->peer && qemu_can_send_packet(nc)) { 1391 qemu_flush_queued_packets(nc->peer); 1392 } 1393 } else { 1394 /* Complete all queued packets, to guarantee we don't modify 1395 * state later when VM is not running. 1396 */ 1397 qemu_flush_or_purge_queued_packets(nc, true); 1398 } 1399 } 1400 } 1401 1402 void net_cleanup(void) 1403 { 1404 NetClientState *nc; 1405 1406 /*cleanup colo compare module for COLO*/ 1407 colo_compare_cleanup(); 1408 1409 /* We may del multiple entries during qemu_del_net_client(), 1410 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1411 */ 1412 while (!QTAILQ_EMPTY(&net_clients)) { 1413 nc = QTAILQ_FIRST(&net_clients); 1414 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1415 qemu_del_nic(qemu_get_nic(nc)); 1416 } else { 1417 qemu_del_net_client(nc); 1418 } 1419 } 1420 1421 qemu_del_vm_change_state_handler(net_change_state_entry); 1422 } 1423 1424 void net_check_clients(void) 1425 { 1426 NetClientState *nc; 1427 int i; 1428 1429 net_hub_check_clients(); 1430 1431 QTAILQ_FOREACH(nc, &net_clients, next) { 1432 if (!nc->peer) { 1433 warn_report("%s %s has no peer", 1434 nc->info->type == NET_CLIENT_DRIVER_NIC 1435 ? "nic" : "netdev", 1436 nc->name); 1437 } 1438 } 1439 1440 /* Check that all NICs requested via -net nic actually got created. 1441 * NICs created via -device don't need to be checked here because 1442 * they are always instantiated. 1443 */ 1444 for (i = 0; i < MAX_NICS; i++) { 1445 NICInfo *nd = &nd_table[i]; 1446 if (nd->used && !nd->instantiated) { 1447 warn_report("requested NIC (%s, model %s) " 1448 "was not created (not supported by this machine?)", 1449 nd->name ? nd->name : "anonymous", 1450 nd->model ? nd->model : "unspecified"); 1451 } 1452 } 1453 } 1454 1455 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1456 { 1457 return net_client_init(opts, false, errp); 1458 } 1459 1460 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1461 { 1462 const char *type = qemu_opt_get(opts, "type"); 1463 1464 if (type && is_help_option(type)) { 1465 show_netdevs(); 1466 exit(0); 1467 } 1468 return net_client_init(opts, true, errp); 1469 } 1470 1471 /* For the convenience "--nic" parameter */ 1472 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1473 { 1474 char *mac, *nd_id; 1475 int idx, ret; 1476 NICInfo *ni; 1477 const char *type; 1478 1479 type = qemu_opt_get(opts, "type"); 1480 if (type && g_str_equal(type, "none")) { 1481 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1482 } 1483 1484 idx = nic_get_free_idx(); 1485 if (idx == -1 || nb_nics >= MAX_NICS) { 1486 error_setg(errp, "no more on-board/default NIC slots available"); 1487 return -1; 1488 } 1489 1490 if (!type) { 1491 qemu_opt_set(opts, "type", "user", &error_abort); 1492 } 1493 1494 ni = &nd_table[idx]; 1495 memset(ni, 0, sizeof(*ni)); 1496 ni->model = qemu_opt_get_del(opts, "model"); 1497 1498 /* Create an ID if the user did not specify one */ 1499 nd_id = g_strdup(qemu_opts_id(opts)); 1500 if (!nd_id) { 1501 nd_id = id_generate(ID_NET); 1502 qemu_opts_set_id(opts, nd_id); 1503 } 1504 1505 /* Handle MAC address */ 1506 mac = qemu_opt_get_del(opts, "mac"); 1507 if (mac) { 1508 ret = net_parse_macaddr(ni->macaddr.a, mac); 1509 g_free(mac); 1510 if (ret) { 1511 error_setg(errp, "invalid syntax for ethernet address"); 1512 goto out; 1513 } 1514 if (is_multicast_ether_addr(ni->macaddr.a)) { 1515 error_setg(errp, "NIC cannot have multicast MAC address"); 1516 ret = -1; 1517 goto out; 1518 } 1519 } 1520 qemu_macaddr_default_if_unset(&ni->macaddr); 1521 1522 ret = net_client_init(opts, true, errp); 1523 if (ret == 0) { 1524 ni->netdev = qemu_find_netdev(nd_id); 1525 ni->used = true; 1526 nb_nics++; 1527 } 1528 1529 out: 1530 g_free(nd_id); 1531 return ret; 1532 } 1533 1534 int net_init_clients(Error **errp) 1535 { 1536 net_change_state_entry = 1537 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1538 1539 QTAILQ_INIT(&net_clients); 1540 1541 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1542 net_init_netdev, NULL, errp)) { 1543 return -1; 1544 } 1545 1546 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1547 return -1; 1548 } 1549 1550 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1551 return -1; 1552 } 1553 1554 return 0; 1555 } 1556 1557 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1558 { 1559 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1560 return -1; 1561 } 1562 1563 return 0; 1564 } 1565 1566 /* From FreeBSD */ 1567 /* XXX: optimize */ 1568 uint32_t net_crc32(const uint8_t *p, int len) 1569 { 1570 uint32_t crc; 1571 int carry, i, j; 1572 uint8_t b; 1573 1574 crc = 0xffffffff; 1575 for (i = 0; i < len; i++) { 1576 b = *p++; 1577 for (j = 0; j < 8; j++) { 1578 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1579 crc <<= 1; 1580 b >>= 1; 1581 if (carry) { 1582 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1583 } 1584 } 1585 } 1586 1587 return crc; 1588 } 1589 1590 uint32_t net_crc32_le(const uint8_t *p, int len) 1591 { 1592 uint32_t crc; 1593 int carry, i, j; 1594 uint8_t b; 1595 1596 crc = 0xffffffff; 1597 for (i = 0; i < len; i++) { 1598 b = *p++; 1599 for (j = 0; j < 8; j++) { 1600 carry = (crc & 0x1) ^ (b & 0x01); 1601 crc >>= 1; 1602 b >>= 1; 1603 if (carry) { 1604 crc ^= POLYNOMIAL_LE; 1605 } 1606 } 1607 } 1608 1609 return crc; 1610 } 1611 1612 QemuOptsList qemu_netdev_opts = { 1613 .name = "netdev", 1614 .implied_opt_name = "type", 1615 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1616 .desc = { 1617 /* 1618 * no elements => accept any params 1619 * validation will happen later 1620 */ 1621 { /* end of list */ } 1622 }, 1623 }; 1624 1625 QemuOptsList qemu_nic_opts = { 1626 .name = "nic", 1627 .implied_opt_name = "type", 1628 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1629 .desc = { 1630 /* 1631 * no elements => accept any params 1632 * validation will happen later 1633 */ 1634 { /* end of list */ } 1635 }, 1636 }; 1637 1638 QemuOptsList qemu_net_opts = { 1639 .name = "net", 1640 .implied_opt_name = "type", 1641 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1642 .desc = { 1643 /* 1644 * no elements => accept any params 1645 * validation will happen later 1646 */ 1647 { /* end of list */ } 1648 }, 1649 }; 1650 1651 void net_socket_rs_init(SocketReadState *rs, 1652 SocketReadStateFinalize *finalize, 1653 bool vnet_hdr) 1654 { 1655 rs->state = 0; 1656 rs->vnet_hdr = vnet_hdr; 1657 rs->index = 0; 1658 rs->packet_len = 0; 1659 rs->vnet_hdr_len = 0; 1660 memset(rs->buf, 0, sizeof(rs->buf)); 1661 rs->finalize = finalize; 1662 } 1663 1664 /* 1665 * Returns 1666 * 0: success 1667 * -1: error occurs 1668 */ 1669 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1670 { 1671 unsigned int l; 1672 1673 while (size > 0) { 1674 /* Reassemble a packet from the network. 1675 * 0 = getting length. 1676 * 1 = getting vnet header length. 1677 * 2 = getting data. 1678 */ 1679 switch (rs->state) { 1680 case 0: 1681 l = 4 - rs->index; 1682 if (l > size) { 1683 l = size; 1684 } 1685 memcpy(rs->buf + rs->index, buf, l); 1686 buf += l; 1687 size -= l; 1688 rs->index += l; 1689 if (rs->index == 4) { 1690 /* got length */ 1691 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1692 rs->index = 0; 1693 if (rs->vnet_hdr) { 1694 rs->state = 1; 1695 } else { 1696 rs->state = 2; 1697 rs->vnet_hdr_len = 0; 1698 } 1699 } 1700 break; 1701 case 1: 1702 l = 4 - rs->index; 1703 if (l > size) { 1704 l = size; 1705 } 1706 memcpy(rs->buf + rs->index, buf, l); 1707 buf += l; 1708 size -= l; 1709 rs->index += l; 1710 if (rs->index == 4) { 1711 /* got vnet header length */ 1712 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1713 rs->index = 0; 1714 rs->state = 2; 1715 } 1716 break; 1717 case 2: 1718 l = rs->packet_len - rs->index; 1719 if (l > size) { 1720 l = size; 1721 } 1722 if (rs->index + l <= sizeof(rs->buf)) { 1723 memcpy(rs->buf + rs->index, buf, l); 1724 } else { 1725 fprintf(stderr, "serious error: oversized packet received," 1726 "connection terminated.\n"); 1727 rs->index = rs->state = 0; 1728 return -1; 1729 } 1730 1731 rs->index += l; 1732 buf += l; 1733 size -= l; 1734 if (rs->index >= rs->packet_len) { 1735 rs->index = 0; 1736 rs->state = 0; 1737 assert(rs->finalize); 1738 rs->finalize(rs); 1739 } 1740 break; 1741 } 1742 } 1743 1744 assert(size == 0); 1745 return 0; 1746 } 1747